Cooperative Patent Classification


CPC Definition - Subclass F16H

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Last Updated Version: 2017.08
GEARING
Definition statement

This place covers:

Gearings for conveying rotary motion

  • Toothed gearings
  • Friction gearings, e.g. gearings using endless flexible members
  • Fluid gearings
  • Change speed or reversing gearings
  • Differential gearings
  • Using intermittently-driving members
  • Gearings not limited to rotary motion
  • Mechanical gearings using levers, links or cams
  • Using intermittently-driving members

Combination of gearings

General details of gearings

Control of gearings

Relationships with other classification places

Subclass F16H for gearings is a function oriented place. Gearings or transmissions comprising general applicable inventions or intended for different applications are classified in this subclass. Specially adapted gearings for a particular purpose should be classified in the related subclass for the application. Some examples where these gearings will be classified when specially adapted or for a particular purpose could be find in the list of references below.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Gearings in harvesters or mowers

Gearings for toys

Toothed-wheel gearing for metal-rolling mills

Arrangement of transmissions in vehicles

Transmissions for railway locomotives

Vehicle steering gears

Transmission for cycles

Transmissions for marine propulsion

Marine steering gears

Transmission of power for wind motors

Gearings associated with fluid-actuated devices

Gearing used in indicating or recording apparatus in connection with measuring devices

Driving arrangements for tuning resonant circuits

Driving mechanisms for apparatus for transmission of coded digital information

Informative references

Attention is drawn to the following places, which may be of interest for search:

lArrangement of transmissions in vehicles

Fluid pressure actuators, Hydraulics or pneumatics in general

Couplings for transmitting rotation

Clutches

Special rules of classification

The use of the available Indexing Codes in this subclass is mandatory and should be assigned for additional information to facilitate searching. However, please note that the classifications in the Indexing Codes of this subclass are only complete after January 2014. Also note that the Indexing Codes under F16H 2700/00 are no longer used for classifying new documents

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Gearing

mechanical, hydraulic, electric, or other means for transmitting mechanical motion or force

Toothed gearing

includes worm gearing and other gearing involving at least one wheel or sector provided with teeth or the equivalent, except gearing with chains or toothed belts, which is treated as friction gearing

Conveying motion

includes transmitting energy, and means that the applied and resultant motions are of the same kind, though they may differ in, e.g. speed, direction or extent

Rotary motion

implies that the motion may continue indefinitely

Oscillating motion

means moving about an axis to an extent which is limited by the construction of the gearing and which may exceed one revolution, the movement being alternately forwards and backwards during continued operation of the gearing

Reciprocating motion

means moving substantially in a straight line, the movement being alternately forwards and backwards during continued operation of the gearing

Reversing or reversal

means that an applied movement in one direction may produce a resultant movement in either of two opposed directions at will

Central gears

includes any gears whose axis is the main axis of the gearing, e.g. sun or ring gear

Creeping

means that when the vehicle has come to a stop, the engine is at idle (i.e., there is no request by the operator for a higher engine speed/torque), but due to the rotation of various transmission components, the vehicle starts to move, and the vehicle operator has some control over movement with a brake

Inching

means that the vehicle operator has some control, besides using a brake, over moving the vehicle by small degrees

Toothed gearings for conveying rotary motion (specific for conveying rotary motion with variable gear ratio or for reversing rotary motion F16H 3/00)
Definition statement

This place covers:

Transmission layout for gearing with fixed ratio and using gears with teeth

References
Limiting references

This place does not cover:

Toothed gearing for conveying rotary motion with variable gear ratio of for reversing rotary motion

Informative references

Attention is drawn to the following places, which may be of interest for search:

Gears associated with electric machines

{the driving and driven axes being designed to assume variable positions relative to one another during operation}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Angle drives for power tools

comprising conical gears only
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Angle drives for power tools

comprising worm and worm-wheel
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Taking up backlash for transmissions with crossing shafts

Support of worm gear shafts

Worm gears associated with electric machines

in which the central axis of the gearing lies inside the periphery of an orbital gear
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Wave gearings with flexsplines

Cycloidal or planetary mechanisms for adjustable back-rest in which the central axis of the gearing lies inside the periphery of an orbital gear, e.g. one gear without sun gear

Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion (speed-changing or reversing mechanisms F16H 59/00 - F16H 63/00)
Definition statement

This place covers:

Using only gears with teeth.

{the teeth being arranged on a generally flat, e.g. disc-type surface}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

With eccentric arranged lever arms for driving a disc

Gearings for conveying rotary motion by endless flexible members (specific for conveying rotary motion with variable gear ratio or for reversing rotary motion F16H 9/00; {Belts, V-belts, ropes, cables, and chains F16G, chain-wheels F16H 55/30; pulleys F16H 55/36})
Definition statement

This place covers:

Belts drives, chain drives, rope drives with a fixed ratio, and tensioning mechanisms and guiding means used in such systems and ways or tools to mount the belt or chain or rope on the pulley or sprocket.

References
Limiting references

This place does not cover:

Gearings for conveying rotary motion by endless flexible members with variable gear ratio or for reversing rotary motion

Informative references

Attention is drawn to the following places, which may be of interest for search:

Pulleys per se

Chains or belts per se

Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members (control of change-speed or reversing-gearings conveying rotary motion F16H 59/00 - F16H 63/00)
Definition statement

This place covers:

Only transmission layout of belt or chain or rope drives for conveying rotary motion with variable gear ratio or for reversing rotary motion.

References
Limiting references

This place does not cover:

Combinations of gearing conveying rotary motion by endless members and toothed gearing

Pulleys per se

Control of change-speed or reversing-gearings conveying rotary motion

Actuators for shifting

Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearings for conveying rotary motion by endless flexible members with fixed gear ratio

Chains or belts per se

engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
Definition statement

This place covers:

Transmission layout of transmission where a belt is axially squeezed between two sheaves of at least on one pulley.

Gearings for conveying rotary motion by friction between rotary members (specific for conveying rotary motion with variable gear ratio or for reversing rotary motion F16H 15/00; {friction discs F16H 55/32})
Definition statement

This place covers:

Transmission layout of transmissions where rotary motion is transferred with a fixed ratio by the friction of the surfaces of members where the surfaces are pressed to each other; systems to keep the cylindrical members in contact such that rotary motion can be transferred.

References
Limiting references

This place does not cover:

Friction gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion

Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members ({gearings for reversal only F16H 3/14, F16H 3/60} ; control of change-speed or reversing-gearings conveying rotary motion F16H 59/00 - F16H 63/00)
Definition statement

This place covers:

Transmission layout of transmissions where rotary motion is transferred with a variable ratio by the friction of the surfaces of members where the surfaces are pressed to each other.

References
Limiting references

This place does not cover:

Friction gearings for conveying rotary motion with fixed gear ratio

Control of change-speed or reversing-gearings conveying rotary motion

Informative references

Attention is drawn to the following places, which may be of interest for search:

Combination of friction gearing and toothed gearing

Gearings providing a continuous range of gear ratios
Definition statement

This place covers:

Only transmission layout of conveying rotary motion with a continuously variable ratio by friction between rotary members that are not using flexible endless members and where the rotary members are not in planetary motion, examples of this group are toroidal transmission or friction ring transmissions.

Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion (with intermittently-driving members F16H 27/00 - F16H 31/00; rope or like tackle for lifting or haulage B66D 3/00)
Definition statement

This place covers:

Gearings for converting limited rotary movement, e.g. oscillation, into an other rotary movement or a limited rotary movement into reciprocating movement or vice versa in particular by using flexible means, or rack and pinion mechanisms.

Gearings for converting reciprocating movement into another reciprocating movement by flexible means.

References
Limiting references

This place does not cover:

Step-by-step mechanisms without freewheel members, e.g. Geneva driven

Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action

Other gearings with freewheeling members or other intermittently driving members

Rope or like tackle for lifting or haulage

Gearings comprising primarily only links or levers, with or without slides
Definition statement

This place covers:

Crank gearings.

Guiding mechanisms, e.g. for straight line guidance, using links or levers.

Gearings for conveying or interconverting oscillating or reciprocating motions by links or levers, e.g. toggle mechanisms.

Gearings with movement in three dimension comprising primarily links and levers.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Guiding mechanisms for drawing machines

Informative references

Attention is drawn to the following places, which may be of interest for search:

Rope or like tackle for lifting or haulage

Crankshafts or eccentric shafts

Adjustable cranks or eccentrics

Adjustable connecting rods

by means of cranks, eccentrics, or like members fixed to one rotary member and guided along tracks on the other
Definition statement

This place covers:

Illustrative example of subject matter classified in this group.

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Wobble-plate gearings; Oblique-crank gearings {(conveying rotary motion with toothed nutating gears F16H 1/321)}
Definition statement

This place covers:

Gearings using rotating wobble plates or discs for converting rotary movement into a reciprocating movement of a gear member.

References
Limiting references

This place does not cover:

Gearings with toothed wobble members for conveying rotary motion, e.g. reduction gears with high ratio

Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
Definition statement

This place covers:

  • Gearings using essential cams to convey rotary motion.
  • Screw and nut mechanisms.
  • Other gearings using essential cams for interconverting rotary and reciprocating motions
References
Limiting references

This place does not cover:

Gearings using crankshafts or eccentrics

Wobble plate gearings

Informative references

Attention is drawn to the following places, which may be of interest for search:

Rope or like tackle for lifting or haulage

Adjustable connecting rods

Adjustable cams

F16C53/04

Cam followers

F16C53/06

Screw mechanisms (with automatic reversal F16H 25/12)
References
Limiting references

This place does not cover:

Gearings with helical grooves and automatic reversal for interconverting rotary motion and reciprocating motion

with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
Special rules of classification

This group and subgroup F16H 25/2204 are only given if the subject-matter of the cooperating parts, e.g. the circulating balls are of particular interest representing the invention information. If the ball screw device is just an additional feature invention classification is given in group F16H 25/20.

Elements essential to such mechanisms, e.g. screws, nuts (F16H 25/22 takes precedence)
Definition statement

This place covers:

  • Screw shafts.
  • Nuts or their support.
  • Safety nuts.
  • Seals, wipers or scrapers for screw-nut devices.
  • Brakes for locking the screw device in their position.
  • Means for facilitating manufacturing or assembly.
Special rules of classification

In this group, classification of additional information as follows is mandatory:

Intermediate screw supports for reducing unsupported length of screw shaft

Supports for compensating misalignment or offset between screw and nut

Brakes using a wrap spring, i.e. a helical wind up spring for braking or locking

Special features for facilitating the manufacturing of spindles, nuts, or sleeves of screw devices

Special materials or coatings for screws or nuts

Step-by-step mechanisms without freewheel members, e.g. Geneva driven (rotary gearings with cyclically-varying velocity ratio F16H 35/02; impulse couplings F16D 5/00; clockwork escapements G04B 15/00)
Definition statement

This place covers:

  • Step-by-step mechanisms using mechanisms with driving pins in driven slots, e.g. Geneva drives.
  • Step-by-step mechanisms using gears with interupted toothing.
  • Step-by-step mechanisms using an reciprocating or oscillating transmission member.
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Clockwork escapements

Informative references

Attention is drawn to the following places, which may be of interest for search:

Rotary gearings with cyclically-varying velocity ratio

Impulse couplings

Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action (freewheels F16D 41/00{; Gearings for converting oscillating or reciprocating movement with freewheeling members or other intermittently-driving members into a rotary movement F16H 31/00})
Definition statement

This place covers:

Gearings for conveying continuous rotary motion into a rotary output motion by using intermittently-driving members or with freewheel action

  • with stationary intermittently-driving members, i.e. not rotating with either of the shafts
  • with rotating intermittently-driving members
References
Limiting references

This place does not cover:

Gearings for converting oscillating, i.e. non continuous rotary input, or reciprocating movement with freewheeling members or other intermittently-driving members into a rotary movement

Informative references

Attention is drawn to the following places, which may be of interest for search:

Adjustable cranks or eccentrics

Freewheels or freewheel clutches

Other gearings with freewheeling members or other intermittently driving members (F16H 21/00, F16H 23/00, F16H 25/00 take precedence; gearings involving the use of automatic changing-mechanisms, e.g. cyclically-actuated reversal gearings, see the appropriate groups)
Definition statement

This place covers:

Gearings for converting oscillating, i.e. non continuous rotary input, or reciprocating movement with freewheeling members or other intermittently-driving members into an other movement, e.g. a step by step movement.

References
Limiting references

This place does not cover:

Gearings using freewheel members for changing ratio

Gearings comprising primarily only links or levers

Wobble plate or oblique crank gearings

Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms

Gearings for conveying rotary motion with intermittently-driving members or freewheel action

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Wrenches of the ratchet type

Informative references

Attention is drawn to the following places, which may be of interest for search:

Step-by-step mechanisms without freewheel member

Gearings based on repeated accumulation and delivery of energy
Definition statement

This place covers:

  • Gearings using mechanical accumulators, e.g. weights, springs or intermittently-connected flywheels.
  • Gearings for conveying rotary motion using essentially spring action for achieving variable ratio.
  • Gearings for conveying rotary motion using essentially inertia for achieving variable ratio, e.g. by orbital gears with regulating masses or gyroscopic action.
  • Gearings for converting, based essentially on inertia, of rotary motion into reciprocating or oscillating motion and vice versa.
References
Limiting references

This place does not cover:

Gravity or inertia motors

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Apparatus for generating mechanical vibrations involving rotary unbalanced masse

Gearings or mechanisms with other special functional features
Definition statement

This place covers:

Groups for functional features not otherwise provided for in this subclass

  • For variation of rotational phase relationship
  • For conveying rotary motion with cyclically varying velocity ratio
  • Means for supporting gears allowing relative movement between supports thereof
  • For adjustment of members on moving parts from a stationary place
  • Arrangements or devices for absorbing overload or preventing damage by overload
  • Mechanisms with only two stable positions, e.g. acting at definite angular positions
  • Mechanisms for movements or movement relations conforming to mathematical formulae
  • Turning devices for rotatable members, e.g. shafts
{for variation of rotational phase relationship, e.g. angular relationship between input and output shaft (couplings F16D 3/10)}
References
Limiting references

This place does not cover:

Couplings with means for varying the angular relationship

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Changing the angular relationship between crankshaft and camshaft

for conveying rotary motion with cyclically varying velocity ratio (speed-changing mechanisms operating cyclically, see the appropriate groups)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearings converting continuous rotation into a step-by-step rotary movement without freewheeling members

Eccentric mounted gears in gearings

Pulleys or toothed members of non-circular shape, e.g. elliptic gears

Gearings designed to allow relative movement between supports thereof without ill effects (F16H 1/26, F16H 1/48 take precedence{; mounting or supporting gearboxes F16H 57/025})
References
Limiting references

This place does not cover:

Special means compensating for misalignment of axes

Special means compensating for misalignment of axes for gears having orbital motion

Support of transmission casing, e.g. torque arms, or attachment to other devices

Arrangements or devices for absorbing overload or preventing damage by overload ({for screw mechanisms F16H 25/2021}; couplings for transmitting rotation F16D)
References
Limiting references

This place does not cover:

Arrangements or devices for absorbing overload or preventing damage by overload for screw mechanisms

Slip couplings, e.g. slipping on overload

Couplings with safety member for disconnecting

Informative references

Attention is drawn to the following places, which may be of interest for search:

Monitoring wear or stress of transmission elements, e.g. for triggering maintenance

Monitoring of overload conditions

Detection of mechanical transmission failures

Arrangements of torque limiters in wrenches or screwdrivers

B23C23/14

Mechanisms for movements or movement relations conforming to mathematical formulae (devices in which computing operations are performed mechanically G06G 3/00)
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Devices in which computing operations are performed mechanically

Turning devices for rotatable members, e.g. shafts (starting devices for internal-combustion engines F02N)
References
Limiting references

This place does not cover:

Starting devices for internal-combustion engines

Combinations of mechanical gearings, not hereinbefore provided for (applications of "underdrives" or "overdrives" in motor vehicles, combinations with differential gearings in motor vehicles B60K)
Definition statement

This place covers:

  • Combination of toothed and friction gearings.
  • Combination of toothed or friction gearings not provided in groups F16H 1/00 - F16H 35/00.
  • Gearings comprising essential combinations with other gearing mechanism where not only an additional gearing element like lever, link or cam is added to the basic gearing.
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Combination of gearings with a plurality of driving or driven shafts comprising differential gearing for four wheel drive

{toothed gearing combined with continuous variable friction gearing}
Definition statement

This place covers:

Combination of toothed and continuous variable friction gearings where the two gearings are arranged in series. The toothed gearing is arranged before or after the CVT (no power split).

{toothed gearing combined with a gear using endless flexible members for reversing rotary motion only}
Definition statement

This place covers:

The idle gear for reversing is replaced by a gear with an endless flexible member, e.g. a chain transmission to establish the reverse ratio. In general no CVTs.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangement of reverse gear in transmissions with continuously meshing gears

Gearings for reversal only

with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
Definition statement

This place covers:

Combination of gearings with a plurality of driving or driven shafts.

References
Limiting references

This place does not cover:

Toothed gearings for conveying rotary motion with constant gear ratio having a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts

with differential gearing
Definition statement

This place covers:

  • Combination of gearings with differentials for dividing or summarising torque between two or more torque path.
  • Combination of CVTs with differentials for splitting torque.
References
Limiting references

This place does not cover:

Toothed gearings for conveying rotary motion with constant gear ratio having a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts

Combination of gearings with a plurality of driving or driven shafts comprising differential gearing for four wheel drive

Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types (F16H 21/14, F16H 21/28, F16H 21/30 take precedence; toothed or friction gearing or cam gearing with only an additional lever or link, see the appropriate group for the main gearing)
Definition statement

This place covers:

Gearings comprising essential combinations with other gearing mechanism where not only an additional gearing element like lever, link or cam is added to the basic gearing.

References
Limiting references

This place does not cover:

Mechanisms for conveying rotary motion by means of cranks, eccentrics, or like members fixed to one rotary member and guided along tracks on the other

Crank gearings with one connecting rod combined with cams or additional guides

Crank gearings with one connecting rod combined with members having rolling contact, e.g. gears

Informative references

Attention is drawn to the following places, which may be of interest for search:

Screw mechanisms with both nut and screw being driven

Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution ({application to motor vehicles B60K} ; application to lifting or pushing equipment B66F; control of exclusively fluid gearing F16H 61/38)
Definition statement

This place covers:

Systems wherein the pressure of a gas or a liquid is increased in a pump and this pressure is used to drive a turbine for example piston pump and piston motor.

References
Limiting references

This place does not cover:

Control of fluid gearing

Control of hydrostatic fluid gearing

Details of fluid pumps of motors

Informative references

Attention is drawn to the following places, which may be of interest for search:

Pneumatic hammers

Application to lifting or pushing equipment

Rotary fluid gearing of the hydrokinetic type (control of exclusively fluid gearing F16H 61/38)
Definition statement

This place covers:

Constructions of hydrodynamic torque converters: systems wherein the kinetic energy of a fluid is increased in a pump and this kinetic energy is used to drive a turbine.

References
Limiting references

This place does not cover:

Lock-up clutches of torque converters

Fluid gearing combined with mechanical gearing

Control of torque converter lock-up clutches

Control of hydrodynamic fluid gearings

Hydrodynamic couplings

Other fluid gearing, e.g. with oscillating input or output {(generating mechanical vibrations of infrasonic or sonic frequency B06B; percussive tools B25D 9/00; mine roof supports for step by step movement E21D 23/00; reciprocating-piston machines without rotary main shaft F01B 11/08; fluid pressure actuators F15B)}
Definition statement

This place covers:

Systems wherein the pressure or the kinetic energy of the fluid is not substantially constant during one cycle because the pump or the motor has for example only one cylinder.

References
Limiting references

This place does not cover:

Details of fluid pumps or motors

Fluid-actuated devices for displacing a member from one position to an other

Combinations of fluid gearings for conveying rotary motion with couplings or clutches (F16H 41/22, {F16H 47/085} take precedence; conjoint control of driveline clutches and change-speed gearing in vehicles B60W 10/02, B60W 10/10 {and B60W 30/18})
Definition statement

This place covers:

The combination of a fluid gearing such as a hydrodynamic torque converter for example with claw couplings or friction clutches for example to lock up the torque converter or to uncouple the torque converter from the engine or the transmission

References
Limiting references

This place does not cover:

Control of torque converter lock-up clutches

Informative references

Attention is drawn to the following places, which may be of interest for search:

Rotary fluid gearing of the hydrokinetic type, for example for details not related to the lock-up of the torque converter

Fluid couplings or clutches with pumping sets of the volumetric type

Rotary fluid couplings or clutches of the hydrokinetic type

Dampers

Combinations of mechanical gearing with fluid clutches or fluid gearing (conjoint control of driveline clutches and change-speed gearing in vehicles B60W 10/02 and B60W 10/10)
Definition statement

This place covers:

  • Characterising layout of combination of mechanical gearing such as planetary gearing with fluid gearing such as a hydrodynamic torque converter.
  • Control means for the combination of mechanical gearing with fluid clutches.
References
Limiting references

This place does not cover:

Control of torque converter lock-up clutches

Conjoint control of clutch and gearing for propulsion of vehicles

Informative references

Attention is drawn to the following places, which may be of interest for search:

Electromagnetic actuated clutch-brake combinations

Special rules of classification

Contrary to references in the IPC the control means for shifting of combinations of mechanical and fluid gearing are also included in this group and subgroups (no reorganisation had been performed in group F16H 47/00 related to subjects of F16H 61/00)

Differential gearings (cooling or lubricating of differential gearing F16H 57/04)
References
Limiting references

This place does not cover:

Cooling or lubricating of differential gearings

Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangement or mounting of differential gearing in vehicles

Arrangement or mounting of a transfer gear in vehicles for driving both front and rear wheels having a transfer gear

Arrangement or mounting of control devices for differential gearing of vehicle

Special rules of classification

When classifying in this group, in the absence of an indication to the contrary, classification is made in all appropriate places.

Multiple interconnected differential sets
Definition statement

This place covers:

Combinations of several interconnected differential sets, for example a combination of a right-and-left differential with a center differential (such a relationship as between “center differential unit 14” and “front differential unit 12” in the figure below: EP 1527933 A2)

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with cams
Definition statement

This place covers:

Differentials having cams, for example, in between the two output members as seen in the figure below (EP 1167824 A2: “Output rotary members 12B, 13B” are output members and “cam groove 31 and balls 15” comprise the cam mechanism).

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consisting of two linked clutches
Definition statement

This place covers:

Those differentials that divide one input into two outputs without using planet gears but by using two linked clutches (see “clutches 21, 25” in the figure below: US 2003/0051935 A1).

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using friction clutches or brakes
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Clutches

using positive clutches or brakes
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Clutches

using fluid action, e.g. viscous clutches
Definition statement

This place covers:

Differentials, the differential action of which is suppressed by utilizing the function of fluid viscosity, etc. such as, for example, viscous clutches (see the figure below: US5458547A)

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using internally-actuatable fluid pressure, e.g. internal pump types
Definition statement

This place covers:

Differentials, the differential action of which is suppressed by fluid pressure that is generated, for example, by internal pumps actuated by the difference of rotation numbers between two outputs (see the figures below: US6238315B1)

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using self-locking gears or self-braking gears
Definition statement

This place covers:

Differentials, the differential action of which is suppressed in response to a difference in torque that is generated between two outputs.

with self-braking intermeshing gears having parallel axes and having worms or helical teeth
Definition statement

This place covers:

Differentials, the differential action of which is suppressed by, for example, meshing reaction forces of helical gears that are arranged in parallel axes, by way of the said helical gears being pushed against the casing of the differentials (see the figure below: EP2050985A2)

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with self-braking intermeshing gears having perpendicular arranged axes and having worms or helical teeth
Definition statement

This place covers:

Differentials, the differential action of which is suppressed by, for example, meshing reaction forces of helical gears or worms that are arranged in orthogonal axes, by way of the said helical gears or worms being pushed against the casing of the differentials (see the figure below: US5098356A)

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using multiple means for force boosting
Definition statement

This place covers:

Differentials, in which the engaging power of a pilot clutch is amplified by using a cam, for example, and thereby, to have a main clutch engaged (see “pilot clutch 33”,”cam mechanism 35” and “main clutch 39” in the figure below: US 6436002 B1)

media10.png

using fluid pressure actuators
Definition statement

This place covers:

Differentials, the differential action of which is suppressed by, for example, fluidic actuators that are controllable from outside of the differential (see the figure below: EP0456560A2)

media11.png

characterised by intentionally generating speed difference between outputs
Definition statement

This place covers:

Those differentials that are intentionally made to have different rotation numbers between two outputs for the purpose of improving the turning performance or controlling the yaw motion of vehicles (see the figure below: US5456641A)

media12.png

Constructional details (the outer casing comprising the differential and supporting input and output shafts F16H 57/037)
Definition statement

This place covers:

Those differentials that are characterised by such component parts as gear wheels, casings, washers, shafts, bearings or carriers

References
Limiting references

This place does not cover:

The outer casing comprising the differential and supporting input and output shafts

characterised by features of the rotating cases
Definition statement

This place covers:

Casings that accommodate the differential mechanism internally and are rotated by the power from the input shaft (see number 120 in the sample figures below: US 2008/0229878 A1)

media13.png
media14.png

Other gearings
Definition statement

This place covers:

Gearings or mechanisms not otherwise provided for:

  • Wave gearings using flexible deformable members, e.g. Harmonic drive transmissions
  • Magnetic gearings having in additional engaging gear elements, e.g. teeth
  • Gearings using guided balls to transmit motion
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Harmonic drives for manipulators or robots

Informative references

Attention is drawn to the following places, which may be of interest for search:

Worm gears with balls between the cooperating gear parts

Gearings where the central axis of the gearing lies inside the periphery of an orbital gear

Gearings for conveying rotary motion with intermediate members guided along tracks on both rotary members

Rotating torque transmitting elements of the permanent-magnet type

Levers of gearing mechanisms ({connecting rods or links pivoted at both ends F16C 7/00; gear levers F16H 59/00}; manipulating levers G05G)
Definition statement

This place covers:

Levers for gearing mechanisms.

References
Limiting references

This place does not cover:

Gear levers for transmission control

Informative references

Attention is drawn to the following places, which may be of interest for search:

Transmissions with cams

Control levers per se

Special rules of classification

This group is merely used because the particular levers are normally classified with the mechanism they are used for

Cams; Non-rotary cams; Cam followers, e.g. rollers
Definition statement

This place covers:

Cams, camshafts or cam followers

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearings comprising primarily only cams or cam-followers

{characterised by their construction, e.g. assembling or manufacturing features (grinding of camshafts B24B 19/12)}
Definition statement

This place covers:

  • Constructional features of camshafts.
  • Assembling or manufacturing of camshafts.
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Camshafts for valve gears

Informative references

Attention is drawn to the following places, which may be of interest for search:

Making crankshafts by working or processing metal tubes, rods or profiles without essentially removing material

Grinding of camshafts

Elements with teeth or friction surfaces for conveying motion; Worms; Pulleys; Sheaves (pulley-blocks B66D 3/04)
Definition statement

This place covers:

  • Different kind of gear elements for conveying rotary motion with and without teeth, e.g. gears, racks, worms, pulleys or chain wheels.
  • Constructional features of these elements.
  • Profiles of teeth for gearings.
References
Limiting references

This place does not cover:

Screw and nut gearings

Details of fluid gearing

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Pulley blocks for lifting or hauling appliances

Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties {(coatings for lubrication F16H 57/041; producing gear wheels from plastics or substances in a plastic state B29D 15/00; heat treatment C21D 9/32; electrolytic surface treatment C25D; heating by electromagnetic field H05B 6/00)}
Definition statement

This place covers:

  • Use of materials for toothed gear members.
  • Toothed gear members characterised by their material properties achieved by particular treatments.
  • Gear features related to production by moulding, e.g. injection moulding.
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Coatings for lubrication

Producing gear wheels from plastics or substances in a plastic state

Heat treatment

Electrolytic surface treatment

Informative references

Attention is drawn to the following places, which may be of interest for search:

Heating by electromagnetic field

Constructively simple tooth shapes, e.g. shaped as pins, as balls {(gearwork for clocks and watches G04B 13/00)}
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Worm gear transmissions with balls between the cooperating gear elements

Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearworks for clocks and watches

Construction providing resilience or vibration-damping (F16H 55/06 takes precedence; resilient coupling of wheel or wheel-rim with shaft F16D 3/50, F16D 3/80)
References
Limiting references

This place does not cover:

Toothed gear wheels using particular materials for providing resilience or vibration damping

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Resilient coupling of wheel or wheel rim with the shaft

Informative references

Attention is drawn to the following places, which may be of interest for search:

Devices for varying tension of belts, ropes or chains with vibration damping means

Vibration-damping or noise reducing means specially adapted for gearings

Reducing vibrations or noise of the gearbox casing

Suppression of vibrations or noise of gear selectors or gear levers

Control of hydrostatic fluid gearing preventing or reducing vibrations or noise

F16H61/418

Toothed wheels ({with simple tooth shapes F16H 55/10} ; worm wheels F16H 55/22; chain wheels F16H 55/30)
Definition statement

This place covers:

  • Toothed wheels.
  • Toothed belt pulleys.
References
Limiting references

This place does not cover:

Wheels having constructively simple tooth shapes, e.g. pins or balls

Worm wheels

Chain wheels or sprockets

Special devices for taking up backlash {(in tuner actuating devices H03J, H03J 1/06; in gear-train of clocks or watches G04B 35/00)}
Definition statement

This place covers:

  • Means for taking up backlash when related to the toothed wheels. If backlash is taken up by modification of the shaft support, e.g. distance of axes between engaging members it should be classified in F16H 57/12.
  • For bevel gears.
References
Limiting references

This place does not cover:

Means for taking up backlash at worm wheels

Means for taking up backlash at racks

Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangements for adjusting or for taking-up backlash for planetary gearings conveying rotary motion

Arrangements for adjusting or for taking-up backlash not provided for elsewhere

for transmissions with crossing shafts, especially worms, worm-gears (bevel gears, crown wheels, helical gears F16H 55/17)
Definition statement

This place covers:

  • Worm gears or worm wheels.
  • Special features of worm gears.
References
Limiting references

This place does not cover:

Bevel gears, crown wheels or helical gears

Informative references

Attention is drawn to the following places, which may be of interest for search:

Profiles of gears with perpendicular non-intersecting shaft arrangement

Special devices for taking up backlash
Definition statement

This place covers:

Worm gears or worm wheels with means for taking up backlash.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Transmission with arrangements for dividing torque between two or more worm wheels

Backlash reducing means for bevel gears, crown wheels or helical gears

Means for taking up backlash at racks

Support of worm gear shafts

Arrangements for adjusting or for taking-up backlash not provided for elsewhere

Pulleys or friction discs of adjustable construction
Definition statement

This place covers:

  • Pulleys or friction discs where diameter for the pulley or chains can be modified.
  • Pulleys with centrifugal masses for automatically changing the active diameter dependent on speed.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Control of continuous variable gearing using endless flexible means

Final output mechanisms, e.g. means or actuating devices to adjust the friction discs

General details of gearing (of screw-and-nut gearing F16H 25/00; of fluid gearing F16H 39/00 - F16H 43/00)
Definition statement

This place covers:

  • Monitoring wear or stress of transmission elements.
  • Shaft assemblies specially adapted for gearings.
  • Gearboxes, Mounting gearing in gearboxes.
  • Lubrication or cooling of gearings.
  • General details of gears having orbital motion, e.g. planet carriers.
  • Arrangement for adjusting or taking-up backlash not otherwise provided for.
References
Limiting references

This place does not cover:

Details of screw-and-nut gearings

Fluid gearing

Features relating to lubrication or cooling {or heating} ({in hydrokinetic gearing F16H 41/30; } control of lubrication or cooling in hydrostatic gearing F16H 61/4165)
Definition statement

This place covers:

Lubrication or cooling of gearings

References
Limiting references

This place does not cover:

Lubrication or cooling in hydrokinetic gearing

Control of lubrication or cooling in hydrostatic gearing

Informative references

Attention is drawn to the following places, which may be of interest for search:

Lubrication systems in vehicles

Vehicle endless-track units with lubrication means

Lubrication in general

Special rules of classification

Multiple aspects of classification are given in the subgroups of F16H 57/04, i.e.

  • if a disclosed subject-matter is considered as "invention information" than an appropriate ECLA-group shall be given to each single aspect of such subject-matter.
  • if a disclosed subject-matter is considered as "additional information" than an appropriate Indexing Code-group shall be given to each single aspect of such subject-matter.
  • if there is no particular application place for the type of gearing in the subgroups of F16H 57/048, at least an Indexing Code outside F16H 57/048 should be given, e.g. in case of wobble plate gears F16H 23/00.

Documents published before January 2009 are not fully reclassified into the subgroups of this scheme. Therefore documents in group F16H 57/04 may disclose aspects which should be classified in one of the subgroups.

Documents published before January 2009 disclosing multiple aspects of different subgroups might be classified in only one of these groups.

{using different fluids, e.g. a traction fluid for traction gearing and a lubricant for bearings or reduction gears}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Sealings between different partitions of a gear case or reservoir

{Cleaning of lubricants, e.g. filters or magnets}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Venting trapped air for hydraulic systems

Venting of hydraulic transmissions

Filtration, Filtering material

Degasification of liquids

Deaeration of lubricants

{Lubricant filters}
Definition statement

This place covers:

Filter devices.

Magnets for collecting metallic debris.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Oilsumps with filter

{Absorption elements for lubricants, e.g. oil felts}
Definition statement

This place covers:

  • Feeding lubricant by a felt or other foamed material. The felt often forms a reservoir for life time lubrication.
  • Feed by capillary action, e.g. using a wick.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Grease depots

{Exchange or filling of transmission lubricant (filling or draining lubricant of or from machines or engines F01M 11/04; servicing, maintaining, repairing, or refitting of vehicles B60S 5/00)}
Definition statement

This place covers:

  • Draining of transmission fluids.
  • Filling of transmission fluid.s
  • Exchange of transmission fluids, e.g. fluids for automatic transmissions.
  • Cleaning or flushing of transmissions.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Flushing in hydrostatic fluid gearing

{Coatings or solid lubricants, e.g. antiseize layers or pastes}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Use of materials for toothed members

{Cooling or heating; Control of temperature}
Definition statement

This place covers:

Cooling of transmission, their elements (e.g. gears, casings) or cooling of the lubricant.

References
Limiting references

This place does not cover:

Lubrication or cooling in hydrokinetic gearing

Control of lubrication or cooling in hydrostatic gearing

Informative references

Attention is drawn to the following places, which may be of interest for search:

Engine cooling

{Air cooling or ventilation; Heat exchangers; Thermal insulations}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Heat exchangers per se

{Air cooling or ventilation}
Definition statement

This place covers:

The term "air cooling or ventilation" shall include transmission elements and/or lubricants cooled by heat exchange with ambient air, e.g. ventilated air cooling of CVT belts, guidance of lubricant through air cooled tubes or air cooled parts of the casing, cooling fins inside or outside the casing.

{Heat exchangers adapted or integrated in the gearing}
Definition statement

This place covers:

The term "heat exchangers" shall include lubricant cooled or heated by heat exchange with another fluid, e.g. with water, oil or exhaust gas.

{relating to lubrication supply, e.g. pumps (arrangement of pumps F16H 57/0441); Pressure control (grooves with pumping effect for supplying lubricant F16H 57/0428; generation and variation of line pressure for transmission control F16H 61/0021)}
Definition statement

This place covers:

All kind of lubrication pumps or special means to produce flow of lubrication. Further lubrication control units or valves to supply the transmission with lubricant.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Generation or control of line pressure

{Pumps}
References
Limiting references

This place does not cover:

Arrangement of lubrication pumps

Informative references

Attention is drawn to the following places, which may be of interest for search:

Supply of control fluid; Pumps or accumulators therefore

Lubricating pumps per se

{for supply of different gearbox casings or sections}
Definition statement

This place covers:

The term "gearbox section" means a section containing gearing elements like gear, belts, chains or clutches. A section comprising only shaft support bearings is not considered as a different gearbox section.

References
Limiting references

This place does not cover:

Arrangement of lubrication pumps

Informative references

Attention is drawn to the following places, which may be of interest for search:

Control of lubricant levels

Section walls to divide a gear sump

{Control of lubricant levels, e.g. lubricant level control dependent on temperature}
Relationships with other classification places

This classification should not be allocated to documents which merely disclose a splash lubrication. The lubricant level of any splash lubrication sump depends on the rotational speed of the splashing element, but, if a document does not explicitly disclose the problem of "level control", classification should be given only in group F16H 57/0457 for "splash lubrication".

F16H 57/0447 shall also not be allocated to documents dealing with "providing a correct fill level". These are classified in F16H 57/0408 "exchange or filling of transmission lubricant". However, "sensors or indicators for controlling the fluid level should be classified in F16H 57/0449.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Splash lubrication

{Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case}
Relationships with other classification places

Group F16H 57/045 "lubricant storage recervoir" is essentially given for "additional recervoirs". It shall not be given for the mere existance of a gear sump. However, documents dealing with "oil pans" shall be given F16H 57/0452 and dealing with "section walls to divide gear sump" shall be given F16H 57/0453.

The term "gearbox sections" in F16H 57/0445 "supply of different gearbox sections" shall mean sections which contain gearing elements, e.g. gears, belts, chains or clutches. For bearing lubrication F16H 57/0471 should be given.

{Splash lubrication (characterised by the problem reducing losses, e.g. splash losses F16H 57/0409)}
Definition statement

This place covers:

Splash lubrication, e.g. by gearing elements plunging into an oil bath

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Characterised by the problem to increase efficiency, e.g. by reducing splash losses

Control of lubricant levels

{Grease lubrication; Drop-feed lubrication}
Definition statement

This place covers:

  • Grease lubrication.
  • Grease depots.
  • Drip lubrications.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangements for supplying grease from a stationary reservoir or equivalent

{Shift rods or shift forks}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Lubrication guiding means on or inside shift rods or shift forks

Gear shift yokes

{Engine and gearing, i.e. joint lubrication or cooling or heating thereof (electric machines and gearing F16H 57/0476)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearboxes associated or combined with the crankcase of the engine

Joint lubrication or cooling of electric machines and gearing

{Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof}
Special rules of classification

In case of controlled cooling or heating classification should also be given in group F16H 57/0413

{Type of gearings to be lubricated, cooled or heated}
Special rules of classification

According the multiple classification rule in this main group an invention-classification should be given for the type of the gearing. If there is no particular place in subgroups of F16H 57/048 at least an additional classification should be given for the type of the gearing, e.g. for wobble plate gearings F16H 23/00.

Control inputs to {control units of} change-speed-, or reversing-gearings for conveying rotary motion
Definition statement

This place covers:

  • Selector apparatus, e.g. gear shift or range levers.
  • Control inputs being a function of different parameters, e.g. torque, speed or transmission status.
  • Other control inputs related to ambient or vehicle parameters, e.g. road condition, load, steering, clutch or engine.
References
Limiting references

This place does not cover:

Final output mechanisms in the gearbox, e.g. selector or shifting means in the gearbox

Informative references

Attention is drawn to the following places, which may be of interest for search:

Input parameters for vehicles

Special rules of classification

The input values represent in most cases only additional information. Only if the measuring device or the method for measuring of the value forms an essential part of the invention it is classified as 'Invention information'.

In groups F16H 59/00-F16H 63/00, clutches positioned within a gearbox are considered as comprising part of the gearings.

When classifying in groups F16H 59/00-F16H 63/00, control inputs or types of gearing which are considered to represent information of interest for search, may also be classified. Such non-obligatory classification should be given as "additional information", e.g. selected from subgroup F16H 61/66 relating to the type of gearing controlled or from group F16H 59/00 relating to control inputs.

Former IPC notes 5 and 6 are not applied in this scheme

Additional classification should be also given in the codes of F16H.

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Mechanism

means a kinematic chain consisting either of a single element or alternatively of a series of elements, the position of each point on the kinematic chain being derivable from the position of any other point on the chain, and therefore, for a given position of a point on one of the elements forming the kinematic chain there is only one position for each of the other points on the element or series of elements forming the kinematic chain

Final output mechanism

means the mechanism which includes the final output element

Final output element

means the final element which is moved to establish a gear ratio, i.e. which achieves the linking or coupling between two power transmission means, e.g. reverse idler gear, gear cluster, coupling sleeve, apply piston of a hydraulic clutch

Actuating mechanism

means the mechanism, the movement of which causes the movement of another mechanism by being in mutual contact

Final actuating mechanism

means the mechanism actuating the final output mechanism, i.e. this mechanism actuates the final output mechanism which includes the final output element, like coupling sleeve or shift fork

Control functions within {control units of} change-speed- or reversing-gearings for conveying rotary motion{; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing}
Definition statement

This place covers:

Subject matter which is not fully covered by other subgroups of this main group (see appropriate codes):

  • Venting trapped air from hydraulic control systems
  • Cleaning of hydraulic elements, e.g. remove orifice clogging
  • Details of fluid supply channels, e.g. within shafts, for supplying friction devices or transmission actuators with control fluid
  • Supply of electric power, e.g. batteries for back-up supply
  • Initialising the parameters of the controller
  • Power-down of the controller
  • Modifying an existing transmission control, e.g. by replacement of parts
  • Tuning an existing transmission control for racing
  • Measures or means for testing transmission control or parts thereof
  • Robots or simulators for testing
{Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox}
Definition statement

This place covers:

  • Arrangements of the control unit on or in the transmission gearbox.
  • General features of the control units, e.g. supporting or connection of printed circuits, channel plates for supporting valves.
  • Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snap-fittings of valves.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Housings for electric apparatus for protecting electronics against vibration or moisture

{Generation or control of line pressure}
Definition statement

This place covers:

  • Supply of control fluid, e.g. fluid pumps or accumulators for generating line pressure.
  • Additional auxiliary pumps for supply of hydraulic fluid when engine has stopped.
  • Single pumps driven by different sources of power.
  • Control circuits for controlling line pressure.
  • Lubrication or cooling of transmission taken from the hydraulic control supply.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Layout of control circuits for shifting gears with friction clutches or brakes

Layout of control circuits for moving shift actuators

Control for optimising pump efficiency in CVTs

{Braking of gear output shaft using simultaneous engagement of friction devices applied for different gear ratios}
Definition statement

This place covers:

Gearings where braking is achieved by simultaneous engagement of different gear ratios, in fact gear locking which can be smooth when one friction coupling or brake is involved. Sometimes also used instead of a parking lock.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Engine braking

Parking lock mechanisms in the transmission

Signals to parking lock or parking brake being part of the transmission; Control circuits therefore

characterised by the signals used {(for shift actuators F16H 61/28, for continuously variable gearings F16H 61/66)}
Definition statement

This place covers:

Methods for generating shift signals

  • Estimating or calculating of optimal gears or ranges therefor
  • Generating or modifying shift maps
  • Selecting a particular map or ratio depending on particular conditions or situations

Control circuits classified according their essential kind of signals

Circuits where gearshift control is essential controlled by electric means or circuits are classified in F16H 61/0202. This group includes electro hydraulic circuits using different solenoids.

Circuits where gearshift control is essentially controlled by fluid signals are classified in F16H 61/0262. A control with a single solenoid for a sub function, e.g. kick down, is not considered as an electro hydraulic control in the sense of F16H 61/0202.

Circuits where gearshift control is essentially controlled by mechanical forces, e.g. by using centrifugal or gear forces, are classified in F16H 61/0293.

References
Limiting references

This place does not cover:

Control circuits for shift actuators

Control for continuous variable gearings

Informative references

Attention is drawn to the following places, which may be of interest for search:

Control specially adapted for double clutch transmissions

Control specially adapted for change speed gearing in group arrangement

Smoothing ratio shift
Definition statement

This place covers:

  • Synchronisation before shifting
  • Bridging torque interruption
  • Subgroup for smoothing ratio shift using electric signals

See codes for particular shift transitions, e.g. swap shift, jump shift, particular gear sequences, preventing gear butting, suppressing engine flare, low or high torque shifts.

Relationships with other classification places

F16H 61/04 and subgroup F16H 61/0437 are the groups for the more general aspects of gear shifting, because there is no proper IPC place for gear shifting per se, i.e. the gear smooth effect is not an essential feature. If there is pressure control between an releasing friction element and an applied friction element the document is classified in F16H 61/06 or in subgroup F16H 61/061 if there is any electronic control involved.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Signals to clutch outside the gearbox

Signals to engine or motor for smoothing gear shift

by controlling rate of change of fluid pressure
Definition statement

This place covers:

Control of fluid pressure for off-going or on-coming gear friction devices for shift transition from former ration to new target ratio.

Special rules of classification

If there is electronic control involved the document is classified in subgroup F16H 61/061. See codes for fill parameters and for calibration of pressure levels.

Timing control
Definition statement

This place covers:

Timing control during shift transition.

Some timing control is always performed during shifting. Therefore only documents showing special inventive features related to timing control are classified in this group.

Timing of auxiliary gear shifts F16H 2061/085.

Detecting malfunction or potential malfunction, e.g. fail safe (in control of hydrostatic gearing F16H 61/4192); {Circumventing or fixing failures}
Definition statement

This place covers:

  • Diagnose or detection of failures.
  • Avoiding failures by using redundant parts.
  • Adapting to failure by work around with other constrains.
  • Fixing failures by repairing failed parts, e.g. loosening a sticking valve
  • Keeping current state, resume normal operation.
  • Limiting input power.
  • Characterised by the parts where malfunction was assumed or detected.
References
Limiting references

This place does not cover:

Fail safe in control of hydrostatic gearing

Informative references

Attention is drawn to the following places, which may be of interest for search:

Monitoring wear or stress of transmission elements, e.g. for triggering maintenance

Detection of mechanical transmission failures

Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures, for control systems of road vehicle drive controls not related to a particular sub-unit

Inhibiting {or initiating} shift during unfavourable conditions, {e.g. preventing forward reverse shift at high vehicle speed, preventing engine over speed (unintentional control input F16H 61/18)}
Definition statement

This place covers:

  • Inhibiting, preventing shifting during unfavourable conditions (see codes).
  • Holding gear for delaying shifting under unfavourable conditions, e.g. during cornering.
  • Checking feasibility of shift, i.e. determining of shift can be successfulla completed and post shift values are in an acceptable range.
  • Initiating a shift to prevent an unfavourable condition, e.g. forced shift into neutral in case of transmission failure.
  • Preventing or initiating shifts for preventing stall or overspeed of engine.
Relationships with other classification places

In group F16H 61/16 the emphasis is the condition and not an unintentional control input by the driver. A device for preventing unintended movements of shift lever, e.g. the shift from fifth gear into reverse is classified in F16H 61/18. A device where the reverse gear is blocked because the vehicle speed is too high would be classified in F16H 61/16.

References
Limiting references

This place does not cover:

Preventing unintentional control input

Informative references

Attention is drawn to the following places, which may be of interest for search:

Gearshift control characterised by the method for generating shift signals

Preventing unintentional or unsafe shift, {e.g. preventing manual shift from highest gear to reverse gear}
Definition statement

This place covers:

  • Means, e.g. catches or locking devices for preventing unintended shift into reverse gear.
  • Means preventing unintentional or unsafe shifts.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Lever handles with lock mechanisms

Locking of the selector apparatus

Final output mechanism for reverse gear

Preventing gear creeping{; Transmission control during standstill, e.g. hill hold control}
Definition statement

This place covers:

  • Active creep control for slow driving.
  • Hill hold control, e.g. with torque converter or an friction device slightly engaged to keep vehicle stationary.
  • Neutral control, e.g. preparing for drive off.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Vehicle drive off

Preparing to drive off

Holding or hill holding

Creeping

Going to or coming from stand by operation, e.g. for engine start stop operation at traffic lights

Locking {of the control input devices} (F16H 63/34 takes precedence{; vehicle fittings for preventing unauthorised use, e.g. ignition keys interlocked with gear box or gear lever B60R 25/06})
Definition statement

This place covers:

Locking of a control device with exception of final output mechanisms. Input means, e.g. locking of range lever in the 'Park' position.

References
Limiting references

This place does not cover:

Locking of the final output mechanisms

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Vehicle fittings for preventing unauthorised use operating on the vehicle transmission, e.g. ignition keys interlocked with gear box or gear lever

Generation or transmission of movements for final actuating mechanisms
Definition statement

This place covers:

  • Actuators for moving final actuating mechanisms.
  • Means for transmitting movement for selecting and shifting by cables.
  • Linkages for transmitting movement essentially outside the gear box.
Special rules of classification

The generation or transmission of movements comprising essentially the selector apparatus, is classified in group F16H 59/00.

The generation or transmission of movements, when part of the final output mechanisms, is classified in group F16H 63/00.

with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
Definition statement

This place covers:

  • Fluid actuators.
  • Servo actuators for power assisted shifting.
  • Electric actuators, e.g. actuators using electric motors or solenoids.
  • Control of actuators.
References
Limiting references

This place does not cover:

Methods for generating shift signals

Informative references

Attention is drawn to the following places, which may be of interest for search:

Inputs being a function of the gearing status

Hydraulic actuators forming part of the final actuating mechanism

Electric actuators forming part of the final actuating mechanism

Hydraulic {or pneumatic} motors {or related fluid control means} therefor
Definition statement

This place covers:

Fluid actuators.

Servo actuators for power assisted shifting.

Control of actuators.

References
Limiting references

This place does not cover:

Methods for generating shift signals

Informative references

Attention is drawn to the following places, which may be of interest for search:

Inputs being a function of the gearing status

Hydraulic actuators forming part of the final actuating mechanism

Electric motors {actuators or related electrical control means} therefor
Definition statement

This place covers:

Servo actuators for power assisted shifting.

Actuators for range selection.

Control of actuators.

References
Limiting references

This place does not cover:

Methods for generating shift signals

Informative references

Attention is drawn to the following places, which may be of interest for search:

Inputs being a function of the gearing status

Electric actuators forming part of the final actuating mechanism

comprising two mechanisms, one for the preselection movement, and one for the shifting movement (F16H 61/36 takes precedence)
References
Limiting references

This place does not cover:

With at least one movement, e.g. for selecting or shifting, being transmitted by a cable

Informative references

Attention is drawn to the following places, which may be of interest for search:

Ratio selector apparatus comprising a final actuating mechanism

Final output mechanisms having elements remote from the gearbox

Special rules of classification

The features of this group represent in most cases not an inventive concept. Therefore this group was not systematically allocated to shift linkages with two mechanisms. Group is not complete.

hydrostatic (involving modification of the gearing F16H 39/02, F16H 39/04)
Definition statement

This place covers:

  • Devices or systems to vary the transmission ratio of hydrostatic gearing or control the hydraulic power transmission between a pump and a motor having no specific entry in the following subgroups.
  • Arrangements or mountings of the control apparatus on the hydrostatic gearing.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Hydrostatic gearings comprising integrated control parts (valves) or accessories

Control of circuit pressure
Definition statement

This place covers:

  • Devices for controlling pressure not specific for the high or low working pressures.
  • Control of differential pressure.
Control of high pressure, e.g. avoiding excess pressure by a relief valve
Definition statement

This place covers:

  • Devices for limiting a maximum pressure in the hydrostatic high pressure conduits;
  • Check valves, relief valves, regulating valves.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Preventing overload by changing the capacity of a pump or a motor

Control of low pressure
Definition statement

This place covers:

  • Devices for regulating or limiting pressure in the hydrostatic low pressure conduits.
  • Check valves, relief valves, regulating valves in low pressure conduits.
Control of circuit flow
Definition statement

This place covers:

  • Devices for regulating the circuit flow.
  • Pulsing stop valves, orifice valves or variable restrictions in the conduits.
Control of a bypass valve
Definition statement

This place covers:

  • Devices for connecting high pressure conduits with low pressure conduits.
  • Control circuits characterised by features related to the bypass valves.
by using a variable restriction, e.g. an orifice valve
Definition statement

This place covers:

  • Devices for varying the bypass flow, e.g. for implementing a starting clutch of the hydrostatic transmission.
  • Variable orifice valves.
Control related to directional control valves, e.g. change-over valves, for crossing the feeding conduits (forward reverse switching by using swash plate F16H 61/438)
Definition statement

This place covers:

  • Devices for changing the rotational direction of the motor by exchanging the supply conduits.
  • Change-over valves, crossing valves for exchanging the conduits.
Valves related to the control of neutral, e.g. shut off valves (zero tilt rotation holding means F16H 61/439)
Definition statement

This place covers:

  • Devices for interrupting communication between pump and motor.
  • Stop valves, shut-off valves.
  • Pump output closing valves or plates.
  • Intermediate position of change-over valve.
Fluid exchange between hydrostatic circuits and external sources or consumers
Definition statement

This place covers:

  • Devices for connecting the hydrostatic conduits with external sources or consumers, e.g. linear motor actuators of working circuits.
  • Switching valves and controls therefore.
with pressure accumulators
Definition statement

This place covers:

  • Devices for controlling the charging or discharging of accumulators from the high or low pressure conduits.
  • Arrangements of high or low pressure accumulators.
  • Check valves, one way valves between hydrostatic circuit and accumulators.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Hybrid vehicles with regenerative braking using fluid accumulators

Flushing, e.g. by using flushing valves or by connection to exhaust
Definition statement

This place covers:

  • Devices for connecting the hydrostatic low pressure conduits with the exhaust or sump.
  • Flushing valves for leaking the circuit to enable replenishing.
Fluid exchange by aspiration from reservoirs, e.g. sump
Definition statement

This place covers:

  • Devices for feeding the hydrostatic circuits without use of a charging pump.
  • Aspiration from sump or non pressurized reservoirs.
Replenishing or scavenging pumps, e.g. auxiliary charge pumps
Definition statement

This place covers:

  • Pumps and controls for charging the hydrostatic circuit with fluid.
  • Auxiliary pumps driven by input shaft feeding the low pressure conduits.
Open loop circuits
Definition statement

This place covers:

  • Devices for switching between closed loop and open loop circuits.
  • Specific features or arrangements of the open loop circuits.
Special rules of classification

This subgroup is also given as a multiple classification or as additional information.

Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
Definition statement

This place covers:

  • Devices for limiting the pump over-speed when the motor functions as pump.
  • Control of friction brakes in hydraulic motors.
  • Restrictions in circuits, changing pump or motor capacity for braking purposes.
Control of cooling or lubricating
Definition statement

This place covers:

  • Devices for controlling the oil or hydraulic fluid temperature, also by heating, e.g. after start when temperature is low.
  • Devices for controlling oil levels.
  • Controlling the cooling of housings of pumps or motors.
  • Details of the lubrication circuits, control of lubricating pressures.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Features relating to lubrication or cooling for general gearings

Control of venting, e.g. removing trapped air
Definition statement

This place covers:

Devices for removing trapped air in hydrostatic circuits, e.g. breathers therefor

Preventing or reducing vibrations or noise, e.g. avoiding cavitations
Definition statement

This place covers:

  • Devices for damping the pressure oscillations, e.g. by using restrictions or accumulators.
  • Devices for cancelling cavitation, detection of cavitation.
Detecting malfunction or potential malfunction, e.g. fail safe
Definition statement

This place covers:

  • Fail-safe devices.
  • Detection of minimum oil level in the sump.
  • Detection of oil leakages in the circuits.
involving adjustment of a pump or motor with adjustable output or capacity {(F16H 61/46 takes precedence)}
Definition statement

This place covers:

  • Control the displacement of a pump and a motor having no specific entry in the following subgroups.
  • Conjoint actuation of pump and motor.
Motor capacity control by electro-hydraulic control means, e.g. using solenoid valves
Definition statement

This place covers:

  • Electro-hydraulic valves for regulating the pressure of the hydraulic actuator.
  • Linear solenoid valves, pulse width modulated valves.
Motor capacity control by fluid pressure control means
Definition statement

This place covers:

  • Purely hydraulic valves for regulating the pressure of the hydraulic actuator.
  • Hydraulic servo assisted shifting, hydraulic actuators therefor.
Motor capacity control by electric actuators
Definition statement

This place covers:

  • Electric motors for adjusting displacement.
  • Electrically assisted shifting actuation.
Motor capacity control by mechanical control means, e.g. by levers or pedals
Definition statement

This place covers:

Mechanical linkages between manually actuated levers or pedals and shifting means

Pump capacity control by electro-hydraulic control means, e.g. using solenoid valves
Definition statement

This place covers:

  • Electro-hydraulic valves for regulating the pressure of the hydraulic actuator.
  • Linear solenoid valves, pulse width modulated valves.
Pump capacity control by fluid pressure control means
Definition statement

This place covers:

  • Purely hydraulic valves for regulating the pressure of the hydraulic actuator.
  • Hydraulic servo assisted shifting, hydraulic actuators therefor.
Pump capacity control by electric actuators
Definition statement

This place covers:

  • Electric motors for adjusting displacement.
  • Electrically assisted shifting actuation.
Pump capacity control by mechanical control means, e.g. by levers or pedals
Definition statement

This place covers:

Mechanical linkages between manually actuated levers or pedals and shifting means.

Control of forward-reverse switching, e.g. control of the swash plate causing discharge in two directions (using a directional control valve F16H 61/4061)
Definition statement

This place covers:

  • Control of a pump discharging in two opposite directions by swinging displacement.
  • Control of a motor rotating in opposite directions by swinging displacement.
Control of the neutral position, e.g. by zero tilt rotation holding means (using a neutral valve or a shutoff valve F16H 61/4069)
Definition statement

This place covers:

  • Devices to hold a pump in a nearly zero discharge position.
  • Devices to control a motor in a free-wheel or zero torque position by maintaining a nearly zero displacement.
with more than one pump or motor in operation
Definition statement

This place covers:

Control of multiple pumps or motors having no specific entry in the following lower subgroups.

by changing the number of pump or motor units in operation
Definition statement

This place covers:

  • Devices for switching an additional pump or motor to the hydrostatic circuit.
  • Bypass devices for shunting a motor in a series connection of motors.
Control circuits for tandem pumps or motors
Definition statement

This place covers:

Circuits comprising pumps or motors mounted on same shaft.

Selectively controlling multiple pumps or motors, e.g. switching between series or parallel
Definition statement

This place covers:

Devices for switching between a series connection and a parallel connection of pumps and motors.

Control of the balance of torque or speed between pumps or motors (hydrostatic differentials F16H 48/18)
Definition statement

This place covers:

Devices for controlling the balance of torques or speeds between several motors or pumps.

Automatic regulation in accordance with output requirements
Definition statement

This place covers:

  • Regulation of an output requirement not specified in the following subgroups.
  • Regulating methods not specific for a particular output parameter.
for achieving a target speed ratio
Definition statement

This place covers:

  • Closed loop or open loop control to set a target speed ratio between input and output.
  • Automatic speed ratio change by comparing two input variables for example output speed versus throttle opening.
for achieving a target input speed
Definition statement

This place covers:

  • Closed loop or open loop control to set a target input speed or acceleration.
  • Limitation of maximum input speed.
  • Detection of input speed by using for example input shaft pump flow.
for achieving a target input torque
Definition statement

This place covers:

  • Closed loop or open loop control to set a target input torque.
  • Limitation of maximum input torque.
  • Detection of input torque by using for example pump output pressure.
for achieving a target output speed
Definition statement

This place covers:

  • Closed loop or open loop control to set a target output speed or acceleration.
  • Limitation of maximum output speed.
  • Detection of output speed by using for example output shaft governors.
for achieving a target output torque
Definition statement

This place covers:

  • Closed loop or open loop control to set a target output torque.
  • Limitation of maximum output torque.
  • Detection of output torque by using for example motor input pressure.
for achieving a target power, e.g. input power or output power
Definition statement

This place covers:

  • Closed loop or open loop control to set a target input or output power.
  • Limitation of maximum input or output power.
for preventing overload, e.g. high pressure limitation
Definition statement

This place covers:

  • Arrangements for preventing transmission breakage.
  • Limitation of maximum pressure by regulation of pump capacity.
specially adapted for continuously variable gearings (F16H 61/38 takes precedence)
Definition statement

This place covers:

Only control of mechanical continuously variable gearings, e.g. for gearings using endless flexible members or friction gearings.

References
Limiting references

This place does not cover:

Control of exclusively fluid gearing

with endless flexible means
Definition statement

This place covers:

Control only of continuously variable gearings using endless flexible members

Relationships with other classification places

The indented subgroups F16H 61/66227, F16H 61/66231 and F16H 61/6625 are divided according parameters, but groups F16H 61/66254, F16H 61/66272 and F16H 2061/66295 should take precedence.

F16H 61/66227 - transmission ratio control is exclusively depending on speed and torque.

F16H 61/66231 - transmission ratio control is exclusively depending on speed.

F16H 61/6625 - transmission ratio control is exclusively depending on torque.

References
Limiting references

This place does not cover:

Layout of CVT gearings using endless flexible members

Actuators, e.g. for adjusting pulleys

{controlling shifting exclusively as a function of speed and torque}
Definition statement

This place covers:

Transmission ratio control is exclusively depending on speed and torque parameters, i.e. the combinations of what is covered in groups F16H 61/66231 and F16H 61/6625, see the examples given there (controlling of shifting = control of transmission ratio).

{controlling shifting exclusively as a function of speed}
Definition statement

This place covers:

Transmission ratio control is exclusively depending on speed, see the examples in the subgroups (controlling of shifting = control of transmission ratio).

{using electrical or electronical sensing or control means}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group: FR2683288 - Please mind the higher group title: shifting exclusively as a function of speed (controlling of shifting = control of transmission ratio).

media15.png

{using only hydraulical and mechanical sensing or control means}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group: EP0489999 - Please mind the higher group title: shifting exclusively as a function of speed (controlling of shifting = control of transmission ratio).

media16.png

{using purely mechanical sensing or control means}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group: DE3118165 - Please mind the higher group title: shifting exclusively as a function of speed (controlling of shifting = control of transmission ratio)

media17.png

{controlling shifting exclusively as a function of torque}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group: DE19633274

media18.png

Relationships with other classification places

Please do not confuse this group with group for torque sensors: the presence of a torque sensor does not necessarily imply the exclusive control (i.e. also shift-control) as a function of torque. Most torque sensors serve to give a signal for clamping force control, therefore torque sensors or use thereof is mostly classified in F16H 61/66272. For mechanical shift actuators see group F16H 63/067. Controlling of shifting = control of transmission ratio.

Special rules of classification

This group contains the exclusive control as a function of torque. If other input parameters are used, the subject matter should not be classified here.

{controlling of shifting being influenced by a signal derived from the engine and the main coupling}
Definition statement

This place covers:

Control of shifting, see the examples in the subgroups.

Control of transmission ratio based NOT exclusively on one input parameter; if based on speed see F16H 61/66231, exclusively on torque see F16H 61/6625, or a combination of exclusively speed and torque see F16H 61/66227.

{using electrical or electronical sensing or control means}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group: US2008312030 -

controlling of shifting = control of transmission ratio.

media19.png

{using only hydraulical and mechanical sensing or control means}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group:

US5378200 - controlling of shifting = control of transmission ratio

media20.png

{using purely mechanical sensing or control means}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group:

GB1096469 - controlling of shifting = control of transmission ratio.

media21.png

{characterised by means for controlling the torque transmitting capability of the gearing}
Definition statement

This place covers:

Control of pinch or clamping force/Klemmkraft (by means of e.g. "secondary" pressure control, or torque sensor).

Control of SLIP (since inversely related to pinch force).But no momentary change of ratio.

Also includes the control concerning compensation of centrifugal pressure (i.e. the "extra" secondary pressure that results from the centrifugal effect on the (oil in the) actuator (cylinder) exerting the clamping force: NB constructions to achieve this can be found in F16H 55/56 also).

{characterised by means for controlling the geometrical interrelationship of pulleys and the endless flexible member, e.g. belt alignment or position of the resulting axial pulley force in the plane perpendicular to the pulley axis}
Definition statement

This place covers:

Geometrical relationships; Illustrative example:

WO2010074563

media22.png

Special rules of classification

For specific pulley/disk geometrical properties, see also F16H 55/56;

For geometrical relationships between pulley sets, see F16H 9/16, F16H 9/18

Friction gearings
Definition statement

This place covers:

Only control of friction gearing

Relationships with other classification places

The indented subgroups F16H 61/6645, F16H 61/6646 and F16H 61/6647 are divided according parameters, but groups F16H 61/6648 and F16H 61/6649 should take precedence.

F16H 61/6645 - transmission ratio control is exclusively depending on speed and torque.

F16H 61/6646 - transmission ratio control is exclusively depending on speed.

F16H 61/6647 - transmission ratio control is exclusively depending on torque.

References
Limiting references

This place does not cover:

Layout of continuous variable friction gearing

Layout of continuous variable friction gearing with torque splitting

Actuators

{controlling shifting exclusively as a function of speed and torque}
Definition statement

This place covers:

Transmission ratio control exclusively depending on speed and torque, see combinations of what is classified in F16H 61/6646 and F16H 61/6647, see the examples given there; controlling of shifting = control of transmission ratio.

{controlling shifting exclusively as a function of speed}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group:

JP58124855 - controlling of shifting = control of transmission ratio

media23.png

{controlling shifting exclusively as a function of torque}
Definition statement

This place covers:

Illustrative example of subject matter classified in this group:

GB924485 - controlling of shifting = control of transmission ratio

media24.png

{controlling of shifting being influenced by a signal derived from the engine and the main coupling}
Definition statement

This place covers:

Control of transmission ratio not based on one of: exclusively on speed (see F16H 61/6646), exclusively torque (see F16H 61/6647), or a combination of exclusively speed and torque (see F16H 61/6645). ¨

Illustrative example: US2003135315

media25.png

{characterised by the means for controlling the torque transmitting capability of the gearing}
Definition statement

This place covers:

  • Control of pinch or clamping force/klemmkraft by means of e.g. "secondary" pressure control or torque sensor.
  • Control of slip (since inversely related to pinch force).
  • Also includes the control of compensation of centrifugal pressure, i.e. the "extra" secondary pressure that results from the centrifugal effect on the oil in the actuator (cylinder) exerting the clamping force.
specially adapted for stepped gearings
Special rules of classification

The classification of groups F16H 61/58 - F16H 61/686 was based on a former IPC indexing scheme and is therefore not complete. Since 2010 the classification is given when the control is specially adapted to a particular type of gearing. Only group symbols F16H 61/688 (double clutch transmissions) and F16H 61/70 (change speed gearings in group arrangements) where systematically given for transmissions controls.

specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements
Definition statement

This place covers:

Control of transmissions with different gear trains in series, e.g. a main gear combined with an auxiliary range gear

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Timing of auxiliary gear shifts

Control outputs {from the control unit} to change-speed- or reversing-gearings for conveying rotary motion {or to other devices than the final output mechanism}
Definition statement

This place covers:

  • Final output mechanisms, which includes the final output element, the element which establish a gear ratio, e.g. a coupling sleeve.
  • Actuating means for the final output mechanisms, the so called "final actuating mechanism".
  • Constructional feature of the final output mechanisms.
  • Interlocking devices between output mechanisms.
  • Ratio indicator devices.
  • Parking lock mechanisms.
  • Signals to a clutch outside the gearbox.
  • Signals to an engine or motor, e.g. motor control for smoothing gear shift.
Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Mechanism

means a kinematic chain consisting either of a single element or alternatively of a series of elements, the position of each point on the kinematic chain being derivable from the position of any other point on the chain, and therefore, for a given position of a point on one of the elements forming the kinematic chain there is only one position for each of the other points on the element or series of elements forming the kinematic chain

Final output mechanism

means the mechanism which includes the final output element

Final output element

means the final element which is moved to establish a gear ratio, i.e. which achieves the linking or coupling between two power transmission means, e.g. reverse idler gear, gear cluster, coupling sleeve, apply piston of a hydraulic clutch

Actuating mechanism

means the mechanism, the movement of which causes the movement of another mechanism by being in mutual contact

Final actuating mechanism

means the mechanism actuating the final output mechanism, i.e. this mechanism actuates the final output mechanism which includes the final output element, like coupling sleeve or shift fork

the final output mechanism having an indefinite number of positions
Definition statement

This place covers:

  • Final output mechanisms for continuous variable transmissions (CVTs).
  • Actuators therefor.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Pulleys or friction discs of adjustable construction

Gear shift yokes, {e.g. shift forks}
Definition statement

This place covers:

  • Shift forks and their connection to shift rod or shaft.
  • Slide shoes to move the clutch sleeve.
Locking or disabling mechanisms
Definition statement

This place covers:

  • Locking mechanisms forming part of the final actuating mechanism.
  • Locking mechanisms for the parking lock.
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Locking of the control input devices, e.g. range selector

Control of parking brakes being part of the transmission

Detents {(spring-loaded ball units for holding levers in a limited number of positions G05G 5/065)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Providing feel, e.g. to enable selection

Spring-loaded ball units for holding levers in a limited number of positions