|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

ENGINES AND PUMPS

|  | F02 |
COMBUSTION ENGINES (cyclically operating valves therefor, lubricating, exhausting, or silencing engines Fulltext... Hierarchy... Expanded...F01); HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

|  | F02B |
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (plants in which engines use combustion products Fulltext... Hierarchy... Expanded...F02C, Fulltext... Hierarchy... Expanded...F02G; internal-combustion turbines Fulltext... Hierarchy... Expanded...F02C)

|  | F02B |
Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...F01, specially as regards Note 2 (a). In this sub-class: The following words are used with the meanings indicated: "Positive ignition" means ignition by a source external to the working fluid, e.g. by spark or incandescent source. "Charging" means forcing air or fuel-air mixture into engine cylinders, and thus embraces supercharging. "Scavenging" forcing the combustion residues from the cylinders other than by movement of the working pistons, and thus embraces tuned exhaust systems. Engines with specified cycles or number of cylinders are classified in group Fulltext... Hierarchy... Expanded...F02B 75/02 or Fulltext... Hierarchy... Expanded...F02B 75/16, unless other classifying features predominate.

|  | F02B 1/00 - F02B 11/00 |
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 Fulltext... Hierarchy... Expanded...F02B 11/00; with precombustion chambers Fulltext... Hierarchy... Expanded...F02B 19/00; having air-storage chambers Fulltext... Hierarchy... Expanded...F02B 21/00; with special shape or construction of other combustion chambers Fulltext... Hierarchy... Expanded...F02B 23/00)

|  | F02B 1/00 |
Engines with fuel-air mixture compression

|  | F02B 1/02 |
· | with positive ignition (with non-timed positive ignition Fulltext... Hierarchy... Expanded...F02B 9/06)

|  | F02B 1/04 |
· · | with fuel-air mixture admission into cylinder

|  | F02B 1/06 |
· · · | Methods of operating

|  | F02B 1/08 |
· · | with separate admission of air and fuel into cylinder

|  | F02B 1/10 |
· · · | Methods of operating

|  | F02B 1/12 |
· | with compression ignition (with fuel-air charge ignited by compression ignition of an additional fuel Fulltext... Hierarchy... Expanded...F02B 7/00)

|  | F02B 1/14 |
· · | Methods of operating

|  | F02B 3/00 |
Engines with air compression and subsequent fuel addition

|  | F02B 3/02 |
· | with positive ignition (with non-timed positive ignition Fulltext... Hierarchy... Expanded...F02B 9/06)

|  | F02B 3/04 |
· · | Methods of operating

|  | F02B 3/06 |
· | with compression ignition (Fulltext... Hierarchy... Expanded...F02B 13/02 takes precedence; with fuel-air charge ignited by compression ignition of an additional fuel Fulltext... Hierarchy... Expanded...F02B 7/00)

|  | F02B 3/08 |
· · | Methods of operating (Fulltext... Hierarchy... Expanded...F02B 3/12 takes precedence)

|  | F02B 3/10 |
· · | with intermittent fuel introduction

|  | F02B 3/12 |
· · · | Methods of operating

|  | F02B 5/00 |
Engines with positive ignition (Fulltext... Hierarchy... Expanded...F02B 1/02, Fulltext... Hierarchy... Expanded...F02B 3/02 take precedence; with non-timed positive ignition Fulltext... Hierarchy... Expanded...F02B 9/06)

|  | F02B 5/02 |
· | Methods of operating

|  | F02B 7/00 |
Engines with fuel-air charge ignited by compression ignition of an additional fuel (with pre-combustion chambers Fulltext... Hierarchy... Expanded...F02B 19/00)

|  | F02B 7/02 |
· | the fuel in the charge being liquid

|  | F02B 7/04 |
· · | Methods of operating

|  | F02B 7/06 |
· | the fuel in the charge being gaseous

|  | F02B 7/08 |
· · | Methods of operating

|  | F02B 9/00 |
Engines characterised by other types of ignition

|  | F02B 9/02 |
· | with compression ignition (Fulltext... Hierarchy... Expanded...F02B 1/12, Fulltext... Hierarchy... Expanded...F02B 3/06 take precedence)

|  | F02B 9/04 |
· · | Methods of operating

|  | F02B 9/06 |
· | with non-timed positive ignition, e.g. with hot-spots

|  | F02B 9/08 |
· · | with incandescent chambers

|  | F02B 9/10 |
· · · | Chamber shapes or constructions

|  | F02B 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

|  | F02B 11/02 |
· | convertible from fuel-air mixture compression to air compression or vice versa

|  | F02B 13/00 - F02B 15/00 |
Engines characterised by the method of introducing fuel into cylinders (characterised by use of gaseous or solid fuels Fulltext... Hierarchy... Expanded...F02B 43/00, Fulltext... Hierarchy... Expanded...F02B 45/00; carburettors, fuel-injection apparatus Fulltext... Hierarchy... Expanded...F02M)

|  | F02B 13/00 |
Engines with introduction of fuel into cylinders by use of auxiliary fluid

|  | F02B 13/02 |
· | Compression ignition engines using air or gas for blowing fuel into compressed air in cylinder

|  | F02B 13/04 |
· · | Arrangements or adaptations of pumps

|  | F02B 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

|  | F02B 13/08 |
· · | Arrangements or adaptations of pumps

|  | F02B 13/10 |
· | Use of specific auxiliary fluids, e.g. steam, combustion gas

|  | F02B 15/00 |
Engines characterised by method of introducing fuel into cylinders and not otherwise provided for

|  | F02B 15/02 |
· | having means for sucking fuel directly into cylinder

|  | F02B 17/00 |
Engines characterised by means for effecting stratification of charge in cylinders

|  | F02B 19/00 - F02B 23/00 |
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 Fulltext... Hierarchy... Expanded...F02B 9/08)

|  | F02B 19/00 |
Engines with precombustion chambers

|  | F02B 19/02 |
· | the chamber being periodically isolated from its cylinder

|  | F02B 19/04 |
· · | the isolation being effected by a protuberance on piston or cylinder head

|  | F02B 19/06 |
· | with auxiliary piston in chamber for transferring ignited charge to cylinder space

|  | F02B 19/08 |
· | the chamber being of air-swirl type

|  | F02B 19/10 |
· | with fuel introduced partly into pre-combustion chamber, and partly into cylinder (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 19/02-F02B 19/08 take precedence)

|  | F02B 19/12 |
· | with positive ignition (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 19/02-F02B 19/10 take precedence)

|  | F02B 19/14 |
· | with compression ignition (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 19/02-F02B 19/10 take precedence)

|  | F02B 19/16 |
· | Chamber shapes or constructions not specific to sub-groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 19/02-F02B 19/10

|  | F02B 19/18 |
· · | Transfer passages between chamber and cylinder

|  | F02B 21/00 |
Engines having air-storage chambers

|  | F02B 21/02 |
· | Chamber shapes or constructions

|  | F02B 23/00 |
Other engines having special shape or construction of combustion chambers to improve operation

|  | F02B 23/02 |
· | with compression ignition

|  | F02B 23/04 |
· · | the combustion space being subdivided into two or more chambers (with pre-combustion chambers Fulltext... Hierarchy... Expanded...F02B 19/00)

|  | F02B 23/06 |
· · | the combustion space being arranged in working piston (Fulltext... Hierarchy... Expanded...F02B 23/04 takes precedence)

|  | F02B 23/08 |
· | with positive ignition

|  | F02B 23/10 |
· · | with separate admission of air and fuel into cylinder

|  | F02B 25/00 - F02B 29/00 |
Engines characterised by provisions for charging or scavenging (aspects concerned with driven charging or scavenging pumps Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 33/00-F02B 39/00)

|  | F02B 25/00 |
Engines using fresh charge for scavenging cylinders

|  | F02B 25/02 |
· | using unidirectional scavenging

|  | F02B 25/04 |
· · | Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke

|  | F02B 25/06 |
· · · | the cylinder-head ports being controlled by working pistons, e.g. by sleeve-shaped extensions thereof

|  | F02B 25/08 |
· · | Engines with oppositely-moving reciprocating working pistons

|  | F02B 25/10 |
· · · | with one piston having a smaller diameter or shorter stroke than the other

|  | F02B 25/12 |
· · | Engines with U-shaped cylinders, having ports in each arm

|  | F02B 25/14 |
· | using reverse-flow scavenging, i.e. with both inlet and outlet ports arranged near bottom of piston stroke

|  | F02B 25/16 |
· · | the charge flowing upward essentially along cylinder wall opposite the inlet ports

|  | F02B 25/18 |
· · | the charge flowing upward essentially along cylinder wall adjacent the inlet ports, e.g. by means of deflection rib on piston

|  | F02B 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, sub-groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 25/02-F02B 25/18

|  | F02B 25/22 |
· · | by forming air cushion between charge and combustion residues

|  | F02B 25/24 |
· · | Inlet or outlet openings being timed asymmetrically relative to bottom dead-centre

|  | F02B 25/26 |
· | Multi-cylinder engines other than those provided for in, or of interest apart from, sub-groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 25/02-F02B 25/24 (with movable cylinders Fulltext... Hierarchy... Expanded...F02B 57/00)

|  | F02B 25/28 |
· · | with V-, fan-, or star-arrangement of cylinders

|  | F02B 27/00 |
Using 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 Fulltext... Hierarchy... Expanded...F02B 33/42)

|  | F02B 27/02 |
· | the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means (in exhaust systems only Fulltext... Hierarchy... Expanded...F02B 27/06)

|  | F02B 27/04 |
· | in exhaust systems only, e.g. for sucking-off combustion gases

|  | F02B 27/06 |
· · | the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means

|  | F02B 29/00 |
Engines characterised by other provisions for charging or scavenging; Details not provided for in, or of interest apart from, preceding groups Fulltext... Hierarchy... Expanded...F02B 25/00 and Fulltext... Hierarchy... Expanded...F02B 27/00

|  | F02B 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 Fulltext... Hierarchy... Expanded...F02B 31/00; structural features of induction systems Fulltext... Hierarchy... Expanded...F02M)

|  | F02B 29/04 |
· | Cooling of air intake supply

|  | F02B 29/06 |
· | After-charging, i.e. supplementary charging after scavenging

|  | F02B 29/08 |
· | Modifying distribution valve timing for charging purposes (Fulltext... Hierarchy... Expanded...F02B 29/06 takes precedence; valve-gear therefor Fulltext... Hierarchy... Expanded...F01L)

|  | F02B 31/00 |
Modifying induction systems for imparting a rotation to the charge in the cylinder (structural features of induction systems Fulltext... Hierarchy... Expanded...F02M)

|  | F02B 31/02 |
· | in engines having inlet valves arranged eccentrically to cylinder axis

|  | F02B 33/00 - F02B 39/00 |
Engines characterised by provision of driven charging or scavenging pumps (introducing fuel into cylinders by air pressure Fulltext... Hierarchy... Expanded...F02B 13/00; after-charging Fulltext... Hierarchy... Expanded...F02B 29/06; arrangements for such pumps and other auxiliary apparatus on engines Fulltext... Hierarchy... Expanded...F02B 67/00; combined engine and pump control, control dependent on variables other than those generic to pump Fulltext... Hierarchy... Expanded...F02D)

|  | F02B 33/00 |
Engines with pumps for charging or scavenging (with pumps for sucking combustion residues from cylinders Fulltext... Hierarchy... Expanded...F02B 35/00; with exhaust-driven pumps Fulltext... Hierarchy... Expanded...F02B 37/00)

|  | F02B 33/02 |
· | Engines with reciprocating-piston pumps; Engines with crankcase pumps

|  | F02B 33/04 |
· · | with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase

|  | F02B 33/06 |
· · | with reciprocating-piston pumps other than simple crankcase pumps

|  | F02B 33/08 |
· · · | with the working-cylinder head arranged between working and pumping cylinders

|  | F02B 33/10 |
· · · | with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder

|  | F02B 33/12 |
· · · · | the rear face of working piston acting as pumping member and co-operating with a pumping chamber isolated from crankcase, the connecting-rod passing through the chamber and co-operating with movable isolating member

|  | F02B 33/14 |
· · · · | working and pumping pistons forming stepped piston

|  | F02B 33/16 |
· · · · | working and pumping pistons having differing movements

|  | F02B 33/18 |
· · · | with crankshaft being arranged between working and pumping cylinders

|  | F02B 33/20 |
· · · | with pumping-cylinder axis arranged at an angle to working-cylinder axis, e.g. at an angle of 90°

|  | F02B 33/22 |
· · · | with pumping cylinder situated at side of working cylinder, e.g. the cylinders being parallel

|  | F02B 33/24 |
· · | with crankcase pumps other than with reciprocating pistons only

|  | F02B 33/26 |
· · | Four-stroke engines characterised by having crankcase pumps

|  | F02B 33/28 |
· · | Component parts, details, or accessories of crankcase pumps not provided for in, or of interest apart from, sub-groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 33/02-F02B 33/26

|  | F02B 33/30 |
· · · | Control of inlet or outlet ports (controlling only working-cylinder inlets Fulltext... Hierarchy... Expanded...F01L)

|  | F02B 33/32 |
· | Engines with pumps other than of reciprocating-piston type (with crankcase pumps Fulltext... Hierarchy... Expanded...F02B 33/02)

|  | F02B 33/34 |
· · | with rotary pumps (with cell-type pressure interchangers or the like Fulltext... Hierarchy... Expanded...F02B 33/42)

|  | F02B 33/36 |
· · · | of positive-displacement type

|  | F02B 33/38 |
· · · · | of Roots type

|  | F02B 33/40 |
· · · | of non-positive-displacement type

|  | F02B 33/42 |
· · | with driven apparatus for immediate conversion of combustion gas pressure into pressure of fresh charge, e.g. with cell-type pressure exchangers

|  | F02B 33/44 |
· | Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs (cooling of charge after leaving pump Fulltext... Hierarchy... Expanded...F02B 29/04)

|  | F02B 35/00 |
Engines with pumps for sucking combustion residues from cylinders

|  | F02B 35/02 |
· | using rotary pumps

|  | F02B 37/00 |
Engines with exhaust-driven pumps (passages conducting the charge from the pump to the engine inlet Fulltext... Hierarchy... Expanded...F02B 33/44)

|  | F02B 37/02 |
· | Gas passages between engine outlet and pump drive, e.g. reservoirs

|  | F02B 37/04 |
· | Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump

|  | F02B 37/06 |
· · | the pump being alternatively driven by exhaust and other drive; Control of this alternation, e.g. dependent on speed

|  | F02B 37/08 |
· | Other control of such pumps

|  | F02B 39/00 |
Component parts, details, or accessories relating to, but not provided for in, or of interest apart from, groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F02B 33/00-F02B 37/00 (pumps in general Fulltext... Hierarchy... Expanded...F04; machine elements per se Fulltext... Hierarchy... Expanded...F16)

|  | F02B 39/02 |
· | Drives of pumps (exhaust drives or combined exhaust and other drives Fulltext... Hierarchy... Expanded...F02B 37/00); Varying pump drive gear ratio (control acting both on engine and on pump drive gear ratio Fulltext... Hierarchy... Expanded...F02D)

|  | F02B 39/04 |
· · | Mechanical drives; Variable-gear-ratio drives (non-mechanical pump drives having variable gear ratio Fulltext... Hierarchy... Expanded...F02B 39/08)

|  | F02B 39/06 |
· · · | the engine torque being divided by a differential gear for driving a pump and the engine output shaft

|  | F02B 39/08 |
· · | Non-mechanical drives, e.g. fluid drives having variable gear ratio

|  | F02B 39/10 |
· · · | electric

|  | F02B 39/12 |
· · | Drives characterised by use of couplings or clutches therein (using fluid slip couplings for varying gear ratio Fulltext... Hierarchy... Expanded...F02B 39/08)

|  | F02B 39/14 |
· | Lubrication of pumps; Safety measures therefor

|  | F02B 39/16 |
· | Other safety measures for, or other control of, pumps

|  | F02B 41/00 |
Engines with special means for improving conversion of heat or pressure energy into mechanical power

|  | F02B 41/02 |
· | Engines with prolonged expansion

|  | F02B 41/04 |
· · | in main cylinders

|  | F02B 41/06 |
· · | in compound cylinders

|  | F02B 41/08 |
· · · | Two-stroke compound engines

|  | F02B 41/10 |
· · | in exhaust turbines (use of exhaust turbines for charging Fulltext... Hierarchy... Expanded...F02B 37/00; turbine constructions Fulltext... Hierarchy... Expanded...F01D; gas-turbine plant Fulltext... Hierarchy... Expanded...F02C)

|  | F02B 41/12 |
· · | in jet-propulsion apparatus (plants characterised by jet propulsion Fulltext... Hierarchy... Expanded...F02K)

|  | F02B 43/00 - F02B 45/00 |
Engines operating on non-liquid fuels; Plants including such engines, i.e. combinations of the engine with fuel-generating apparatus (engines having gas-air charge ignited by compression ignition of an additional fuel Fulltext... Hierarchy... Expanded...F02B 7/06; engines convertible from gas to other fuel consumption Fulltext... Hierarchy... Expanded...F02B 69/04; apparatus for generating fuel, e.g. gas, see the relevant classes, e.g. Fulltext... Hierarchy... Expanded...C10)

|  | F02B 43/00 |
Engines operating on gaseous fuels; Plants including such engines

|  | F02B 43/02 |
· | Engines characterised by means for increasing operating efficiency

|  | F02B 43/04 |
· · | for improving efficiency of combustion

|  | F02B 43/06 |
· · | for enlarging charge

|  | F02B 43/08 |
· | Plants characterised by the engines using gaseous fuel generated in the plant from solid fuel, e.g. wood

|  | F02B 43/10 |
· | Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen

|  | F02B 43/12 |
· · | Methods of operating

|  | F02B 45/00 |
Engines operating on other non-liquid fuels; Plants including such engines (plants involving generation of gaseous fuel from solid fuel Fulltext... Hierarchy... Expanded...F02B 43/08)

|  | F02B 45/02 |
· | operating on powdered fuel, e.g. powdered coal (operating on fuel containing oxidant Fulltext... Hierarchy... Expanded...F02B 45/06)

|  | F02B 45/04 |
· · | Plants, e.g. having coal-grinding apparatus

|  | F02B 45/06 |
· | operating on fuel containing oxidant

|  | F02B 45/08 |
· | operating on other solid fuels

|  | F02B 45/10 |
· | operating on mixtures of liquid and non-liquid fuels, e.g. in pasty or foamed state

|  | F02B 47/00 - F02B 51/00 |
Methods of operating engines involving specific pre-treating of, or adding specific substances to, combustion air, fuel, or fuel-air mixture of the engines, and not otherwise provided for (apparatus for performing such pretreatments or additions Fulltext... Hierarchy... Expanded...F02M)

|  | F02B 47/00 |
Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines

|  | F02B 47/02 |
· | the substances being water or steam

|  | F02B 47/04 |
· | the substances being other than water or steam only

|  | F02B 47/06 |
· · | the substances including non-airborne oxygen (Fulltext... Hierarchy... Expanded...F02B 47/10 takes precedence)

|  | F02B 47/08 |
· · | the substances including exhaust gas

|  | F02B 47/10 |
· · · | Circulation of exhaust gas in closed or semi-closed circuits, e.g. with simultaneous addition of oxygen

|  | F02B 49/00 |
Methods of operating air-compressing compression-ignition engines involving introduction of small quantities of fuel in the form of a fine mist into the air in the engine's intake

|  | F02B 51/00 |
Other methods of operating engines involving pre-treating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines

|  | F02B 51/02 |
· | involving catalysts

|  | F02B 51/04 |
· | involving electricity or magnetism

|  | F02B 51/06 |
· | involving rays or sound waves

|  | F02B 53/00 - F02B 55/00 |
Internal-combustion aspects of rotary-piston or oscillating-piston engines (general features Fulltext... Hierarchy... Expanded...F01C)

|  | F02B 53/00 |
Rotary-piston or oscillating-piston engines (rotary pistons or outer members for co-operation therewith Fulltext... Hierarchy... Expanded...F02B 55/00)

|  | F02B 53/02 |
· | Methods of operating

|  | F02B 53/04 |
· | Charge admission or combustion-gas discharge

|  | F02B 53/06 |
· · | Valve control therefor

|  | F02B 53/08 |
· · | Charging, e.g. by means of rotary-piston pump

|  | F02B 53/10 |
· | Fuel supply; Introducing fuel to combustion space

|  | F02B 53/12 |
· | Ignition

|  | F02B 53/14 |
· | Adaptations of engines for driving, or engine combinations with, other devices (aspects predominantly concerning such devices, see the relevant classes for the devices)

|  | F02B 55/00 |
Rotary pistons; Outer members for co-operation therewith

|  | F02B 55/02 |
· | Pistons

|  | F02B 55/04 |
· · | Cooling thereof

|  | F02B 55/06 |
· · · | by air or other gas

|  | F02B 55/08 |
· | Outer members for co-operation with rotary pistons; Casings

|  | F02B 55/10 |
· · | Cooling thereof

|  | F02B 55/12 |
· · · | by air or other gas

|  | F02B 55/14 |
· | Shapes or constructions of combustion chambers

|  | F02B 55/16 |
· | Admission or exhaust passages in pistons or outer members

|  | F02B 57/00 - F02B 59/00 |
Internal-combustion aspects of reciprocating-piston engines with movable cylinders (general features Fulltext... Hierarchy... Expanded...F01B)

|  | F02B 57/00 |
Rotary engines in which the combusted gases displace one or more reciprocating pistons

|  | F02B 57/02 |
· | Fuel or combustion-air supply (cylinder-charge admission or exhaust control Fulltext... Hierarchy... Expanded...F02B 57/04)

|  | F02B 57/04 |
· | Control of cylinder-charge admission or exhaust (peculiar to two-stroke engines or to other engines with working-piston-controlled charge admission or exhaust Fulltext... Hierarchy... Expanded...F02B 57/06)

|  | F02B 57/06 |
· | Two-stroke engines or other engines with working-piston-controlled cylinder-charge admission or exhaust (with combustion space in centre of star Fulltext... Hierarchy... Expanded...F02B 57/10)

|  | F02B 57/08 |
· | Engines with star-shaped cylinder arrangements

|  | F02B 57/10 |
· · | with combustion space in centre of star

|  | F02B 59/00 |
Other reciprocating-piston engines with movable, e.g. oscillating, cylinders (with yieldable walls Fulltext... Hierarchy... Expanded...F02B 75/38)

|  | F02B 61/00 - F02B 65/00 |
Adaptations of engines for special use; Combinations of engines with devices other than engine parts or auxiliaries (of rotary-piston or oscillating-piston engines Fulltext... Hierarchy... Expanded...F02B 53/14; aspects predominantly concerning such devices, see the relevant classes for the devices)

|  | F02B 61/00 |
Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing (the engine torque being divided by a differential gear for driving a scavenging or charging pump and the engine output shaft Fulltext... Hierarchy... Expanded...F02B 39/06; arrangements in vehicles, see the relevant classes for vehicles)

|  | F02B 61/02 |
· | for driving cycles

|  | F02B 61/04 |
· | for driving propellers

|  | F02B 61/06 |
· | Combinations of engines with mechanical gearing (Fulltext... Hierarchy... Expanded...F02B 61/02, Fulltext... Hierarchy... Expanded...F02B 61/04 take precedence)

|  | F02B 63/00 |
Adaptations of engines for driving hand-held tools, electric generators, or pumps; Portable combinations with engine-driven devices

|  | F02B 63/02 |
· | for hand-held tools

|  | F02B 63/04 |
· | for electric generators

|  | F02B 63/06 |
· | for pumps

|  | F02B 65/00 |
Adaptations of engines for other special use; Combinations of engines with other devices, e.g. with non-driven apparatus

|  | F02B 67/00 - F02B 79/00 |
Engines with pertinent characteristics other than those provided for in, or of interest apart from, preceding main groups

|  | F02B 67/00 |
Engines characterised by having specially-arranged auxiliary apparatus and not otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for

|  | F02B 67/02 |
· | with specially-arranged injection pumps and scavenging or charging pumps on V-engines

|  | F02B 67/04 |
· | driving auxiliary apparatus mechanically

|  | F02B 67/06 |
· · | by means of chains, belts, or like endless members

|  | F02B 67/08 |
· | driving auxiliary apparatus non-mechanically

|  | F02B 69/00 |
Internal-combustion engines convertible into other combustion-engine type, not provided for in group Fulltext... Hierarchy... Expanded...F02B 11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types

|  | F02B 69/02 |
· | for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel

|  | F02B 69/04 |
· · | for gaseous and non-gaseous fuels

|  | F02B 69/06 |
· | for different cycles, e.g. convertible from two-stroke to four-stroke

|  | F02B 71/00 |
Free-piston engines; Engines without rotary main shaft

|  | F02B 71/02 |
· | Starting

|  | F02B 71/04 |
· | Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby (aspects predominantly concerning driven apparatus, see the relevant classes for such apparatus)

|  | F02B 71/06 |
· · | Free-piston combustion gas generators per se

|  | F02B 73/00 |
Combinations of two or more engines, not otherwise provided for

|  | F02B 75/00 |
Other engines

|  | F02B 75/02 |
· | Engines characterised by their cycles, e.g. six-stroke

|  | F02B 75/04 |
· | Engines with variable distances between pistons at top dead-centre positions and cylinder heads

|  | F02B 75/06 |
· | Engines with means for equalising torque (compensations of inertial forces, suppression of vibration in systems Fulltext... Hierarchy... Expanded...F16F)

|  | F02B 75/08 |
· | Engines with means for preventing corrosion in gas-swept spaces

|  | F02B 75/10 |
· | Engines with means for rendering exhaust gases innocuous (apparatus per se Fulltext... Hierarchy... Expanded...F01N)

|  | F02B 75/12 |
· | Other methods of operation

|  | F02B 75/16 |
· | Engines characterised by number of cylinders, e.g. single-cylinder engines (Fulltext... Hierarchy... Expanded...F02B 75/26 takes precedence)

|  | F02B 75/18 |
· · | Multi-cylinder engines (scavenging aspects Fulltext... Hierarchy... Expanded...F02B 25/00)

|  | F02B 75/20 |
· · · | with cylinders all in one line

|  | F02B 75/22 |
· · · | with cylinders in V-, fan-, or star-arrangement

|  | F02B 75/24 |
· · · | with cylinders arranged oppositely relative to main shaft and of "flat" type

|  | F02B 75/26 |
· | Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis

|  | F02B 75/28 |
· | Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (arranged oppositely relative to main shaft Fulltext... Hierarchy... Expanded...F02B 75/24)

|  | F02B 75/30 |
· · | with one working piston sliding inside another

|  | F02B 75/32 |
· | Engines characterised by connections between pistons and main shafts and not specific to preceding main groups

|  | F02B 75/34 |
· | Ultra-small engines, e.g. for driving models

|  | F02B 75/36 |
· | Engines with parts of combustion- or working-chamber walls resiliently yielding under pressure

|  | F02B 75/38 |
· · | Reciprocating-piston engines (Fulltext... Hierarchy... Expanded...F02B 75/04 takes precedence; with resiliently-urged auxiliary piston in pre-combustion chamber Fulltext... Hierarchy... Expanded...F02B 19/06)

|  | F02B 75/40 |
· | Other reciprocating-piston engines

|  | F02B 77/00 |
Component parts, details, or accessories, not otherwise provided for

|  | F02B 77/02 |
· | Surface coverings of combustion-gas-swept parts (of pistons or cylinders only Fulltext... Hierarchy... Expanded...F02F)

|  | F02B 77/04 |
· | Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines

|  | F02B 77/06 |
· | Arrangements of purifying apparatus for liquid fuel or lubricant filters (restricted to lubricant-purifying apparatus Fulltext... Hierarchy... Expanded...F01M; restricted to liquid-fuel purifying apparatus Fulltext... Hierarchy... Expanded...F02M)

|  | F02B 77/08 |
· | Safety, indicating, or supervising devices (thermal insulators Fulltext... Hierarchy... Expanded...F02B 77/12)

|  | F02B 77/10 |
· · | Safety means relating to crankcase explosions

|  | F02B 77/12 |
· | Thermal insulation

|  | F02B 77/14 |
· | Engine-driven auxiliary devices combined into units

|  | F02B 79/00 |
Running-in of internal-combustion engines (lubrication thereof Fulltext... Hierarchy... Expanded...F01M)