| IPC 7 English version |
| F02-F02B02908 |
F02B 31/00 - F02B 53/14  |
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| SECTION F – MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
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| F 02 | COMBUSTION ENGINES (cyclically operating valves therefor, lubricating, exhausting, or silencing engines F01); HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS |
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| F 02 B | INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (internal-combustion turbines F02C; plants in which engines use combustion products F02C, F02G) |
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| Notes |
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| (1) | In this subclass, the following terms or expression are used with the meanings indicated: |
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| – | "positive ignition" means ignition by a source external to the working fluid, e.g. by spark or incandescent source; |
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| – | "charging" means forcing air or fuel-air mixture into engine cylinders, and thus includes supercharging; |
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| – | "scavenging" means forcing the combustion residues from the cylinders other than by movement of the working pistons, and thus includes tuned exhaust systems. |
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| (2) | Attention is drawn to the Notes preceding class F01, especially as regards Note (1). |
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| (3) | Engines with specified cycles or number of cylinders are classified in group F02B 75/02 or F02B 75/16, unless other classifying features predominate. |
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| Subclass Index |
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| ENGINES USING FLUID FUEL |
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| Characterised by fluid to be compressed or by ignition |
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| Characterised by the combustion, inlet or charging, or evacuation |
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| combustion |
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| chambers for: precombustion; air storage; combustion |
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| charge: stratification; rotation |
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| introduction of fuel |
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| inlet or charging, or scavenging |
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| general characteristics; details |
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| pumps; details |
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| Special means for improving efficiency |
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| ENGINES USING NON-LIQUID FUEL, THEIR COMBINATIONS WITH FUEL-GENERATING APPARATUS |
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| OPERATION CHARACTERISED BY TREATMENT OR PRETREATMENT OF FUEL, AIR, OR MIXTURE |
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| SPECIAL FORMS OR APPLICATIONS |
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| Kinds of engine |
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| kinds of piston: rotary, oscillating; reciprocating in rotary engines or movable cylinders; free-piston or without rotating main shaft |
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| convertible or with interchangeable parts |
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| with special auxiliary apparatus |
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| other kinds; component parts, details, or accessories |
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| Combinations, not otherwise provided for, of two or more engines |
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| Engines for particular use, combinations with other devices |
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| RUNNING-IN |
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| Engines characterised by the working fluid to be compressed, or characterised by the type of ignition (with both fuel-air mixture compression and air compression, or with both positive ignition and compression ignition F02B 11/00; with precombustion chambers F02B 19/00; having air-storage chambers F02B 21/00; with special shape or construction of other combustion chambers F02B 23/00) |
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1/ | 00 | Engines with fuel-air mixture compression |
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1/ | 02 | . | with positive ignition (with non-timed positive ignition F02B 9/06) |
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1/ | 04 | . | . | with fuel-air mixture admission into cylinder |
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1/ | 06 | . | . | . | Methods of operating |
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1/ | 08 | . | . | with separate admission of air and fuel into cylinder |
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1/ | 10 | . | . | . | Methods of operating |
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1/ | 12 | . | with compression ignition (with fuel-air charge ignited by compression ignition of an additional fuel F02B 7/00) |
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1/ | 14 | . | . | Methods of operating |
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3/ | 00 | Engines with air compression and subsequent fuel addition |
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3/ | 02 | . | with positive ignition (with non-timed positive ignition F02B 9/06) |
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3/ | 04 | . | . | Methods of operating |
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3/ | 06 | . | with compression ignition (F02B 13/02 takes precedence; with fuel-air charge ignited by compression ignition of an additional fuel F02B 7/00) |
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3/ | 08 | . | . | Methods of operating (F02B 3/12 takes precedence) |
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3/ | 10 | . | . | with intermittent fuel introduction |
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3/ | 12 | . | . | . | Methods of operating |
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5/ | 00 | Engines with positive ignition (F02B 1/02, F02B 3/02 take precedence; with non-timed positive ignition F02B 9/06) |
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5/ | 02 | . | Methods of operating |
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7/ | 00 | Engines with fuel-air charge ignited by compression ignition of an additional fuel (with pre-combustion chambers F02B 19/00) |
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7/ | 02 | . | the fuel in the charge being liquid |
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7/ | 04 | . | . | Methods of operating |
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7/ | 06 | . | the fuel in the charge being gaseous |
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7/ | 08 | . | . | Methods of operating |
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9/ | 00 | Engines characterised by other types of ignition |
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9/ | 02 | . | with compression ignition (F02B 1/12, F02B 3/06 take precedence) |
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9/ | 04 | . | . | Methods of operating |
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9/ | 06 | . | with non-timed positive ignition, e.g. with hot-spots |
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9/ | 08 | . | . | with incandescent chambers |
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9/ | 10 | . | . | . | Chamber shapes or constructions |
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11/ | 00 | Engines with both fuel-air mixture compression and air compression, or with both positive ignition and compression ignition, e.g. in different cylinders |
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11/ | 02 | . | convertible from fuel-air mixture compression to air compression or vice versa |
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| Engines characterised by the method of introducing fuel into cylinders (characterised by use of gaseous or solid fuels F02B 43/00, F02B 45/00; carburettors, fuel-injection apparatus F02M) |
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13/ | 00 | Engines with introduction of fuel into cylinders by use of auxiliary fluid |
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13/ | 02 | . | Compression ignition engines using air or gas for blowing fuel into compressed air in cylinder |
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13/ | 04 | . | . | Arrangements or adaptations of pumps |
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13/ | 06 | . | Engines having secondary air mixed with fuel in pump, compressed therein without ignition, and fuel-air mixture being injected into air in cylinder |
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13/ | 08 | . | . | Arrangements or adaptations of pumps |
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13/ | 10 | . | Use of specific auxiliary fluids, e.g. steam, combustion gas |
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15/ | 00 | Engines characterised by method of introducing fuel into cylinders and not otherwise provided for |
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15/ | 02 | . | having means for sucking fuel directly into cylinder |
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17/ | 00 | Engines characterised by means for effecting stratification of charge in cylinders |
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| Engines characterised by having precombustion chambers or air-storage chambers, or characterised by shape or construction of combustion chambers to improve operation (engines with incandescent chambers F02B 9/08) |
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19/ | 00 | Engines with precombustion chambers |
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19/ | 02 | . | the chamber being periodically isolated from its cylinder |
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19/ | 04 | . | . | the isolation being effected by a protuberance on piston or cylinder head |
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19/ | 06 | . | with auxiliary piston in chamber for transferring ignited charge to cylinder space |
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19/ | 08 | . | the chamber being of air-swirl type |
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19/ | 10 | . | with fuel introduced partly into pre-combustion chamber, and partly into cylinder (F02B 19/02 to F02B 19/08 take precedence) |
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19/ | 12 | . | with positive ignition (F02B 19/02 to F02B 19/10 take precedence) |
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19/ | 14 | . | with compression ignition (F02B 19/02 to F02B 19/10 take precedence) |
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19/ | 16 | . | Chamber shapes or constructions not specific to groups F02B 19/02 to F02B 19/10 |
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19/ | 18 | . | . | Transfer passages between chamber and cylinder |
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21/ | 00 | Engines having air-storage chambers |
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21/ | 02 | . | Chamber shapes or constructions |
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23/ | 00 | Other engines having special shape or construction of combustion chambers to improve operation |
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23/ | 02 | . | with compression ignition |
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23/ | 04 | . | . | the combustion space being subdivided into two or more chambers (with pre-combustion chambers F02B 19/00) |
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23/ | 06 | . | . | the combustion space being arranged in working piston (F02B 23/04 takes precedence) |
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23/ | 08 | . | with positive ignition |
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23/ | 10 | . | . | with separate admission of air and fuel into cylinder |
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| Engines characterised by provisions for charging or scavenging (aspects concerned with driven charging or scavenging pumps F02B 33/00 to F02B 39/00) |
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25/ | 00 | Engines using fresh charge for scavenging cylinders |
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25/ | 02 | . | using unidirectional scavenging |
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25/ | 04 | . | . | Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke |
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25/ | 06 | . | . | . | the cylinder-head ports being controlled by working pistons, e.g. by sleeve-shaped extensions thereof |
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25/ | 08 | . | . | Engines with oppositely-moving reciprocating working pistons |
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25/ | 10 | . | . | . | with one piston having a smaller diameter or shorter stroke than the other |
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25/ | 12 | . | . | Engines with U-shaped cylinders, having ports in each arm |
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25/ | 14 | . | using reverse-flow scavenging, e.g. with both inlet and outlet ports arranged near bottom of piston stroke |
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25/ | 16 | . | . | the charge flowing upward essentially along cylinder wall opposite the inlet ports |
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25/ | 18 | . | . | the charge flowing upward essentially along cylinder wall adjacent the inlet ports, e.g. by means of deflection rib on piston |
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25/ | 20 | . | Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports, not provided for in, or of interest apart from, groups F02B 25/02 to F02B 25/18 |
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25/ | 22 | . | . | by forming air cushion between charge and combustion residues |
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25/ | 24 | . | . | Inlet or outlet openings being timed asymmetrically relative to bottom dead-centre |
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25/ | 26 | . | Multi-cylinder engines other than those provided for in, or of interest apart from, groups F02B 25/02 to F02B 25/24 (internal-combustion aspects of rotary engines with movable cylinders F02B 57/00) |
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25/ | 28 | . | . | with V-, fan-, or star-arrangement of cylinders |
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27/ | 00 | Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues (use of driven apparatus for immediate conversion of combustion gas pressure into pressure of fresh charge F02B 33/42) |
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27/ | 02 | . | the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means (in exhaust systems only F02B 27/06) |
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27/ | 04 | . | in exhaust systems only, e.g. for sucking-off combustion gases |
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27/ | 06 | . | . | the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means |
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29/ | 00 | Engines characterised by other provisions for charging or scavenging; Details not provided for in, or of interest apart from, groups F02B 25/00 and F02B 27/00 |
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29/ | 02 | . | Other fluid-dynamic features of induction systems for improving quantity of charge (for also imparting a rotation to the charge in the cylinder F02B 31/00; structural features of induction systems F02M) |
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29/ | 04 | . | Cooling of air intake supply |
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29/ | 06 | . | After-charging, i.e. supplementary charging after scavenging |
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29/ | 08 | . | Modifying distribution valve timing for charging purposes (F02B 29/06 takes precedence; valve-gear therefor F01L) |
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 | F02B 31/00 - F02B 53/14 |
