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Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised

CPC
COOPERATIVE PATENT CLASSIFICATION
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MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotaty-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion aspects of reciprocating-piston engines F02B 57/00, F02B 59/00; crankshafts, crossheads, connecting-rods F16C; flywheels F16F; gearings for interconverting rotary motion and reciprocating motion in general F16H; pistons, piston rods, cylinders, for engines in general F16J)
NOTE
-
This subclass covers, with the exception of the matter provided for in subclasses F01C to F01P:
- engines for elastic fluids, e.g. steam engines;
- engines for liquids and elastic fluids;
- machines for elastic fluids;
- machines for liquids and elastic fluids.

Attention is drawn to the note preceding class F01, especially as regards the definitions of "steam" and "special vapour".

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Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements (F01B 3/00, F01B 5/00 take precedence)
F01B 1/01
.
with one single cylinder
F01B 1/02
.
with cylinders all in one line
F01B 1/04
.
with cylinders in V-arrangement
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F01B 1/06
.
with cylinders in star or fan arrangement
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. .
{
the connection of the pistons with an element being at the outer ends of the cylinders
}
F01B 1/0606
. . .
{
with cam-actuated distribution member(s)
}
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F01B 1/061
. . .
{
with two or more series radial piston-cylinder units
}
F01B 1/0613
. . . .
{
directly located side by side
}
F01B 1/0617
. . . .
{
coupling of several cylinders-barrels
}
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. .
{
the connection of the pistons with an actuating or actuated element being at the inner ends of the cylinders
}
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F01B 1/0624
. . .
{
with cam-actuated distribution member(s)
}
F01B 1/0627
. . . .
{
each machine piston being provided with channels, which are coacting with the cylinder and are used as a distribution member for another piston-cylinder unit
}
F01B 1/0631
. . .
{
the piston-driving or -driven cam being provided with an inlet or an outlet
}
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F01B 1/0634
. . .
{
with two or more series radial piston-cylinder units
}
F01B 1/0637
. . . .
{
directly located side by side
}
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F01B 1/0641
. .
{
Details, component parts specially adapted for such machines
}
F01B 1/0644
. . .
{
Pistons
}
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F01B 1/0648
. . .
{
Cams
}
F01B 1/0651
. . . .
{
consisting of several cylindrical elements, e.g. rollers
}
F01B 1/0655
. . .
{
cylinders
}
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F01B 1/0658
. . .
{
Arrangements for pressing or connecting the pistons against the actuating or actuated cam
}
F01B 1/0662
. . . .
{
hydraulically
}
F01B 1/0665
. . .
{
Disconnecting the pistons from the actuating or actuated cam (in general F01B 31/24)
}
F01B 1/0668
. . .
{
Supporting and guiding means for the piston
}
F01B 1/0672
. . .
{
Draining of the machinehousing; arrangements dealing with leakage fluid
}
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F01B 1/0675
. .
{
Controlling
}
F01B 1/0679
. . .
{
by using a valve in a system with several pump or motor chambers, wherein the flow path through the chambers can be changed, e.g. series-parallel
}
F01B 1/0682
. . .
{
by changing the effective cross sectional piston working surface
}
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F01B 1/0686
. . .
{
by changing the effective piston stroke
}
F01B 1/0689
. . . .
{
by changing the excentricity of one element relative to another element
}
F01B 1/0693
. . .
{
by changing the phase relationship between two actuating or actuated cams
}
F01B 1/0696
. . .
{
by changing the phase relationship between the actuating or actuated cam and the distributing means
}
F01B 1/08
.
with cylinders arranged oppositely relative to main shaft and of "flat" type
F01B 1/10
.
with more than one main shaft, e.g. coupled to common output shaft (combinations of two or more machines or engines F01B 21/00)
F01B 1/12
.
Separate cylinder-crankcase elements coupled together to form a unit
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Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
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.
{
having stationary cylinders
}
. .
{
having two or more sets of cylinders or pistons
}
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. .
{
having self-acting distribution members, e.g. actuated by working fluid
}
. . .
{
Cylindrical distribution members
}
. . .
{
Conical distribution members
}
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F01B 3/0017
. .
{
Component parts, details, e.g. sealings, lubrication
}
F01B 3/002
. . .
{
Cylinders
}
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F01B 3/0023
. . .
{
Actuating or actuated elements
}
F01B 3/0026
. . . .
{
Actuating or actuated element bearing means or driving or driven axis bearing means
}
F01B 3/0029
. . .
{
Casings, housings
}
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.
{
having rotary cylinder block
}
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F01B 3/0035
. .
{
having two or more sets of cylinders or pistons
}
. . .
{
inclined to main shaft axis
}
. .
{
Arrangements for pressing the cylinder barrel against the valve plate, e.g. fluid pressure
}
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F01B 3/0044
. .
{
Component parts, details, e.g. valves, sealings, lubrication
}
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. . .
{
Particularities in the contacting area between cylinder barrel and valve plate
}
. . . .
{
Bearing arrangements
}
. . .
{
Cylinder barrel
}
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F01B 3/0055
. . .
{
Valve means, e.g. valve plate
}
F01B 3/0058
. . . .
{
Cylindrical valve means
}
. . . .
{
Conical valve means
}
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F01B 3/0064
. . .
{
Machine housing
}
F01B 3/0067
. . . .
{
cylinder barrel bearing means
}
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. . .
{
Swash plate
}
F01B 3/0073
. . . .
{
swash plate bearing means or driving or driven axis bearing means
}
. .
{
Connection between cylinder barrel and inclined swash plate
}
.
{
having pistons with rotary and reciprocating motion, i.e. spinning pistons
}
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F01B 3/0082
.
{
Details
}
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F01B 3/0085
. .
{
Pistons
}
F01B 3/0088
. . .
{
Piston shoe retaining means
}
F01B 3/0091
. .
{
Casings, housings
}
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F01B 3/0094
. .
{
Driving or driven means
}
F01B 2003/0097
. . .
{
Z-shafts, i.e. driven or driving shafts in Z-form
}
.
with wobble-plate
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.
the piston motion being transmitted by curved surfaces
. .
{
by two or more curved surfaces, e.g. for two or more pistons in one cylinder
}
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. .
by multi-turn helical surfaces and automatic reversal
. . .
the helices being arranged on the pistons
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.
Control of working-fluid admission or discharge peculiar thereto (suitable for more general application F01L)
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F01B 3/101
. .
{
for machines with stationary cylinders
}
F01B 3/102
. . .
{
Changing the piston stroke by changing the position of the swash plate
}
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. .
{
for machines with rotary cylinder block
}
. . .
{
by turning the valve plate
}
F01B 3/105
. . .
{
by moving the swash plate in a direction perpendicular to the axis of rotation of the cylinder barrel
}
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. . .
{
by changing the inclination of the swash plate
}
F01B 3/107
. . . .
{
using wedges
}
. . .
{
by turning the swash plate (with fixed inclination)
}
. . .
{
by changing the inclination of the axis of the cylinder barrel relative to the swash plate (F01B 3/106 takes precedence)
}
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Reciprocating-piston machines or engines with cylinder axes arranged substantially tangentially to a circle centred on main shaft axis
.
{
the connection of the pistons with an actuated or actuating element being at the outer ends of the cylinders
}
.
{
the connection of the pistons with an actuated or actuating element being at the inner ends of the cylinders
}
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Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (in opposite arrangement relative to main shaft F01B 1/08)
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.
with oppositely reciprocating pistons
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F01B 7/04
. .
acting on same main shaft
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. . .
using only connecting-rods for conversion of reciprocatory into rotary motion or vice-versa
. . . .
with side rods
. . . .
having piston-rod of one piston passed through other piston
. . .
using rockers and connecting-rods
. .
acting on different main shafts
.
with pistons synchronously moving in tandem arrangement
.
with differential piston (F01B 7/20 takes precedence)
.
with two or more pistons reciprocating one within another, e.g. one piston forming cylinder of the other
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Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups (connections disengageable during idling F01B 31/24)
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.
with crankshaft
. .
{
of Bourke-type or Scotch yoke
}
F01B 9/026
. .
{
Rigid connections between piston and rod; Oscillating pistons
}
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.
with rotary main shaft other than crankshaft
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. .
{
the connections comprising gear transmissions
}
F01B 2009/045
. . .
{
Planetary gearings
}
. .
{
with rack and pinion
}
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. .
the piston motion being transmitted by curved surfaces
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F01B 2009/061
. . .
{
by cams
}
F01B 2009/063
. . . .
{
Mono-lobe cams
}
F01B 2009/065
. . . .
{
Bi-lobe cams
}
F01B 2009/066
. . . .
{
Tri-lobe cams
}
F01B 2009/068
. . . .
{
Quadri-lobe cams
}
. .
with ratchet and pawl
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Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
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.
{
in which the movement in the two directions is obtained by one double acting piston motor
}
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. .
{
one side of the double acting piston motor being always under the influence of the fluid under pressure
}
. . .
{
the fluid under pressure being continuously delivered to one motor chamber and reacting the other chamber through a valve located in the piston, to bring the piston back in its start-position
}
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.
{
in which the movement in the two directions is obtained by two single acting piston motors, each acting in one direction
}
F01B 2011/005
. .
{
with oscillating pistons, i.e. the pistons are arranged in ring like cylinder sections and oscillate with respect to the center of the ring
}
. .
{
one single acting piston motor being always under the influence of the fluid under pressure
}
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.
{
in which the movement in only one direction is obtained by a single acting piston motor, e.g. with actuation in the other direction by spring means
}
. .
{
with actuation in the other direction by gravity
}
.
{
in which the movement in two directions is obtained by two or more double acting piston motors
}
.
Equalising or cushioning devices
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.
Engines combined with reciprocatory driven devices, e.g. hammers (with pumps F01B 23/08; predominating aspects of driven devices, see the relevant classes for the devices)
. .
for generating vibration only
.
with direct fluid transmission link (F01B 11/02 takes precedence)
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Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion (machines or engines of flexible-wall type F01B 19/00)
.
with one cylinder only
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.
with more than one cylinder
{
(F01B 3/0032 takes precedence)
}
. .
{
with cylinder axes arranged substantially tangentially to a circle centred on main shaft axis
}
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F01B 13/06
. .
in star arrangement
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. . .
{
the connection of the pistons with the actuated or actuating element being at the outer ends of the cylinders
}
F01B 13/062
. . . .
{
cylinder block and actuating or actuated cam both rotating (F01B 13/064 and F01B 13/066 take precedence)
}
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F01B 13/063
. . . .
{
with two or more series radial piston-cylinder units
}
F01B 13/064
. . . . .
{
cylinder block and actuating or actuated cam both rotating (F01B 13/066 takes precedence)
}
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F01B 13/065
. . . . .
{
directly located side by side
}
F01B 13/066
. . . . . .
{
cylinder block and actuating or actuated cam both rotating
}
F01B 13/067
. . . .
{
with pistons and cylinders having two different parallel axis of rotation
}
. . .
{
the connection of the pistons with an actuated or actuating element being at the inner ends of the cylinders
}
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Reciprocating-piston machines or engines with movable cylinders other than provided for in group F01B 13/00 (with movable cylinder sleeves for working fluid control F01L)
F01B 15/002
.
{
having cylinders in star or fan arrangement, the connection of the pistons with the actuated or actuating element being at the outer ends of the cylinders
}
F01B 15/005
.
{
having cylinders in star or fan arrangement, the connection of the pistons with the actuated or actuating element being at the inner ends of the cylinders
}
F01B 15/007
.
{
having spinning cylinders, i.e. the cylinders rotating about their longitudinal axis
}
F01B 15/02
.
with reciprocating cylinders (with one piston within another F01B 7/20)
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F01B 15/04
.
with oscillating cylinder
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F01B 15/06
. .
Control of working-fluid admission or discharge peculiar thereto
F01B 15/065
. . .
{
by cam-actuated distribution members
}
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Reciprocating-piston machines or engines characterised by use of uniflow principle
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.
Engines
. .
{
with fluid heating
}
F01B 17/025
. .
{
using liquid air
}
. .
{
using separators
}
. .
Steam engines
NOTE
-
- in this group the following indexing codes are used:
F01B 2170/0411 to F01B 2170/0494

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Positive-displacement machines or engines of flexible-wall type
.
with plate-like flexible members
.
with tubular flexible members
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Combinations of two or more machines or engines (F01B 23/00 takes precedence; regulating or controlling, see the relevant groups; combinations of two or more pumps F04; fluid gearing F16H)
F01B 21/02
.
the machines or engines being all of reciprocating-piston type
F01B 21/04
.
the machines or engines being not all of reciprocating-piston type, e.g. of reciprocating steam engine with steam turbine
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Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby (F01B 11/00 takes precedence; fluid gearing F16H; aspects predominantly concerning driven devices, see the relevant classes for these devices; regulating or controlling, see the relevant groups)
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F01B 23/02
.
Adaptations for driving vehicles, e.g. locomotives (arrangements in vehicles, see the relevant classes for vehicles)
F01B 23/04
. .
the vehicles being waterborne vessels
F01B 23/06
.
Adaptations for driving, or combinations with, hand-held tools or the like
F01B 23/08
.
Adaptations for driving, or combinations with, pumps
F01B 23/10
.
Adaptations for driving, or combinations with, electric generators
F01B 23/12
.
Adaptations for driving rolling mills or other heavy reversing machinery
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Regulating, controlling, or safety means (regulating or controlling in general G05)
NOTE
-
- in this group the following indexing codes are used:
F01B 2250/001 to F01B 2250/009

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F01B 25/02
.
Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity (distributing or expansion valve gear F01L)
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F01B 25/04
. .
Sensing elements
F01B 25/06
. . .
responsive to speed
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F01B 25/08
. .
Final actuators
F01B 25/10
. . .
Arrangements or adaptations of working-fluid admission or discharge valves (valves in general F16K)
F01B 25/12
. .
Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted (sensing elements alone F01B 25/04; final actuators alone F01B 25/08)
F01B 25/14
. .
peculiar to particular kinds of machines or engines
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F01B 25/16
.
Safety means responsive to specific conditions (against water hammer or the like in steam engines F01B 31/34)
F01B 25/18
. .
preventing rotation in wrong direction
F01B 25/20
.
Checking operation on safety devices
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F01B 25/22
.
Braking by redirecting working-fluid
F01B 25/24
. .
thereby regenerating energy
F01B 25/26
.
Warning devices
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Starting of machines or engines (starting combustion engines F02N)
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F01B 27/02
.
of reciprocating-piston engines
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F01B 27/04
. .
by directing working-fluid supply, e.g. by aid of by-pass steam conduits
F01B 27/06
. . .
specially for compound engines
F01B 27/08
. .
Means for moving crank off dead-centre (turning-gear in general F16H)
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F01B 29/00
Machines or engines with pertinent characteristics other than those provided for in preceding main groups
F01B 29/02
.
Atmospheric engines, i.e. atmosphere acting against vacuum
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F01B 29/04
.
characterised by means for converting from one type to a different one
F01B 29/06
. .
from steam engine into combustion engine
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F01B 29/08
.
Reciprocating-piston machines or engines not otherwise provided for
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F01B 29/10
. .
Engines (refrigeration machines F25B)
F01B 29/12
. . .
Steam engines (toy steam engines A63H 29/16)
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Component parts, details, or accessories not provided for in, or of interest apart from, other groups (machine or engine casings, other than those peculiar to steam engines, F16M)
F01B 31/005
.
{
Silencing equipment (silencing for steam engines F01B 31/16)
}
F01B 31/02
.
De-icing means for engines having icing phenomena
F01B 31/04
.
Means for equalising torque in reciprocating-piston machines or engines (compensation of inertial forces, suppression of vibration in systems F16F)
F01B 31/06
.
Means for compensating relative expansion of component parts
F01B 31/08
.
Cooling of steam engines (cooling of fluid machines or engines in general F01P); Heating; Heat insulation (heat insulation in general F16L 59/00)
F01B 31/10
.
Lubricating arrangements of steam engines (of fluid machines or engines in general F01M)
F01B 31/12
.
Arrangements of measuring or indicating devices (warning apparatus F01B 25/26; measuring instruments or the like per se G01)
F01B 31/14
.
Changing of compression ratio
F01B 31/16
.
Silencers specially adapted for steam engines (arrangements of exhaust pipes or tubes on steam engines F01B 31/30; gas-flow silencers or exhaust silencers for machines or engines in general F01N)
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F01B 31/18
.
Draining
F01B 31/20
. .
of cylinders
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F01B 31/22
.
Idling devices, e.g. having by-passing valves
F01B 31/24
. .
Disengagement of connections between pistons and main shafts
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F01B 31/26
.
Other component parts, details, or accessories, peculiar to steam engines
F01B 31/28
. .
Cylinders or cylinder covers
F01B 31/30
. .
Arrangements of steam conduits
F01B 31/32
. .
Arrangements or adaptations of vacuum breakers
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F01B 31/34
. .
Safety means against water hammers or against the penetration of water (steam traps F16T)
F01B 31/36
. . .
automatically cutting-off steam supply
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F01B 2170/00
Steam engines, e.g. for locomotives or ships
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F01B 2170/04
.
To-be-deleted with administrative transfer to parent group
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F01B 2170/0405
. .
To-be-deleted with administrative transfer to parent group
F01B 2170/0411
. . .
for locomotives
F01B 2170/0417
. . .
for locomobiles driven by small motors
F01B 2170/0423
. . .
Single acting steam engines with 1, 2 or 3 cylinders
F01B 2170/0429
. . .
Double acting high pressure machines
F01B 2170/0435
. . .
Compound machines with double or plural expansion; Auxiliaries driven by main engine
F01B 2170/0441
. . .
Compound engines with monolytic pistons in same cylinder
F01B 2170/0447
. . .
Machines with more than one piston in a cylinder and with counter moving pistons
F01B 2170/0452
. . .
Engines without connecting rods
F01B 2170/0458
. . .
Moving cylinders for steam engines, e.g. with telescopic cylinder arrangements
F01B 2170/0464
. . .
Oscillating cylinders for steam engines
F01B 2170/047
. . .
mGeneral arrangements for steam engines
F01B 2170/0476
. . .
Components or parts for steam engines
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F01B 2170/0482
. . .
with toroidal cylinder space
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F01B 2170/0488
. . . .
To-be-deleted with administrative transfer to parent group
F01B 2170/0494
. . . . .
with fixed cylinder space
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F01B 2250/00
Accessories of steam engines; Arrangements or control devices of piston pumps, compressors without crank shafts or condensors for so far as they influence the functioning of the engines
F01B 2250/001
.
Valves for steam inlet or outlet
F01B 2250/002
.
Valves, brakes, control or safety devices for steam engines
F01B 2250/003
.
Apparatus for control or receiver or condensor pressure
F01B 2250/004
.
Devices for draining or idling of steam cylinders or for uncoupling piston and connecting rod
F01B 2250/005
.
Oil separators for steam engines
F01B 2250/006
.
Arrangement of or controlling of piston pumps or compressors without crank shaft
F01B 2250/007
.
Condensing devices for steam engines
F01B 2250/008
.
Surface condensors for so far as they influence the functioning of the engine
F01B 2250/009
.
Condensor pumps for steam engines
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013