CPC Definition - Subclass F02F

Last Updated Version: 2021.01
CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
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:

Specially adapted for rotary-piston or oscillating-piston internal-combustion engines

F02B

Specially adapted for gas-turbine plants

F02C

Specially adapted for jet-propulsion plants

F02K

Cylinders; Cylinder heads 
Definition statement

This place covers:

Cylinders and cylinder heads for combustion engines

References
Informative references

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

Cylinders and cylinder heads in general

F16J

{Integrally formed cylinders and cylinder heads}
Definition statement

This place covers:

All applications of a single piece forming the cylinder and the cylinder head.

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having cooling means (cylinder heads F02F 1/26)
References
Limiting references

This place does not cover:

Cylinder heads

F02F 1/26

Informative references

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

Cooling of cylinders or cylinder heads in general

F01P 1/02 and F01P 3/02

for air cooling
Definition statement

This place covers:

Means for air cooling of cylinder heads

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References
Informative references

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

Air cooling of cylinders and cylinder heads

F01P 1/02

running-liner and cooling-part of cylinder being different parts or of different material
Definition statement

This place covers:

Running-liner and cooling-part of cylinder being different parts or of different material:

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Only for air cooled engines, e.g. different materials used for the liners and the cooling fins.

for liquid cooling
References
Informative references

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

Liquid cooling of cylinders and cylinder heads

F01P 3/02

{Attachment of cylinders to crankcase}
Definition statement

This place covers:

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{Siamese-type cylinders, i.e. cylinders cast together}
Definition statement

This place covers:

Siamese-type cylinders, i.e. cylinders cast together:

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References
Informative references

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

Arrangement for cooling cylinders or cylinder heads

F01P 3/02

Preventing corrosion of liquid-swept surfaces
Definition statement

This place covers:

All measures taken for combating corrosion in water cooled engines.

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References
Informative references

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

Engines with means for preventing corrosions of gas swept spaces

F02B 75/08

{for use in engines with two or more pistons reciprocating within same cylinder}
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:

Internal-combustion piston engines or combustion engines in general with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders

F02B 75/28

{particularly for three or more inlet valves}
References
Informative references

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

Mechanisms for driving three or more intake valves per cylinder

F01L 1/265

{with a separate deviation element inside the channel}
Definition statement

This place covers:

Separate deviation element inside the intake channel. E.g. a butterfly valve or an insert placed just before the valve seat.

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{with liners (F02F 1/4257, F02F 1/4271 take precedence)}
Definition statement

This place covers:

Liners in both intake and exhaust channel.

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References
Limiting references

This place does not cover:

Liners in intake channels only

F02F 1/4257

Liners in exhaust channels only

F02F 1/4271

Pistons 
Definition statement

This place covers:

Pistons for combustion engines:

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References
Informative references

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

Pistons in general

F16J

having cooling means
Definition statement

This place covers:

Structural features, e.g. fins, apertures and arrangements for dissipating heat

References
Informative references

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

Air cooling arrangements for pistons

F01P 1/04

Liquid cooling arrangements for pistons

F01P 3/06

the fluid being liquid
Definition statement

This place covers:

Liquid cooling means:

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Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "cooling channel cover" and "ring carrier"
Piston rings, e.g. associated with piston crown {(not used see F16J 9/00)}
References
Limiting references

This place does not cover:

Piston rings

F16J 9/00

Special rules of classification

Not used

Casings, e.g. crankcases {or frames}
Definition statement

This place covers:

Combustion engine casings, e.g. crankcases or frames, e.g. rigid supports for cylinders or crankcases.

References
Informative references

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

Engine casings in general

F16M

{Camshaft or pushrod housings}
References
Informative references

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

Oil sump details

F01M 11/0004

{Sound insulation}
References
Informative references

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

Acoustic insulation for internal-combustion piston engines or combustion engines in general

F02B 77/13

Arrangements of sealings in combustion engines  (piston rings  {F16J 9/00})
Definition statement

This place covers:

Arrangement of sealings in combustion engines

References
Limiting references

This place does not cover:

Piston rings for combustion engines

F16J 9/00

Informative references

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

Sealings per se

F16J