F02B1/00	7	Engines characterised by fuel-air mixture compression (characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition F02B11/00)<br><br><u>NOTE</u><br><br> in this group the following indexing codes are used: <br>F02B2700/02&#160;-&#160;F02B2720/30	F02B1/00	F02B1/00		1849
F02B1/02	8	with positive ignition (with non-timed positive ignition F02B9/06)	F02B1/02	F02B1/02		311
F02B1/04	9	with fuel-air mixture admission into cylinder	F02B1/04	F02B1/04		7945
F02B1/06	10	Methods of operating	F02B1/06	F02B1/06		124
F02B1/08	9	with separate admission of air and fuel into cylinder	F02B1/08	F02B1/08		85
F02B1/10	10	Methods of operating	F02B1/10	F02B1/10		58
F02B1/12	8	with compression ignition (with fuel-air charge ignited by compression ignition of an additional fuel F02B7/00)	F02B1/12	F02B1/12		1696
F02B1/14	9	Methods of operating	F02B1/14	F02B1/14		101
F02B3/00	7	Engines characterised by air compression and subsequent fuel addition (characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition F02B11/00)<br><br><u>NOTE</u><br><br> in this group the following indexing codes are used: <br>F02B2700/02&#160;-&#160;F02B2720/30	F02B3/00	F02B3/00		787
F02B3/02	8	with positive ignition (with non-timed positive ignition F02B9/06)	F02B3/02	F02B3/02		156
F02B3/04	9	Methods of operating	F02B3/04	F02B3/04		47
F02B3/06	8	with compression ignition (compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02)	F02B3/06	F02B3/06		22088
F02B3/08	9	Methods of operating (F02B3/12 takes precedence)	F02B3/08	F02B3/08		79
F02B3/10	9	with intermittent fuel introduction	F02B3/10	F02B3/10		37
F02B3/12	10	Methods of operating	F02B3/12	F02B3/12		36
F02B5/00	7	Engines characterised by positive ignition (engines characterised by fuel-air mixture compression with positive ignition F02B1/02; engines characterised by air compression and subsequent fuel addition with positive ignition F02B3/02; with non-timed positive ignition F02B9/06; characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition F02B11/00)	F02B5/00	F02B5/00		76
F02B5/02	8	Methods of operating	F02B5/02	F02B5/02		102
F02B7/00	7	Engines characterised by the fuel-air charge being ignited by compression ignition of an additional fuel (characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition F02B11/00)	F02B7/00	F02B7/00		57
F02B7/02	8	the fuel in the charge being liquid	F02B7/02	F02B7/02		91
F02B7/04	9	Methods of operating	F02B7/04	F02B7/04		43
F02B7/06	8	the fuel in the charge being gaseous	F02B7/06	F02B7/06		118
F02B7/08	9	Methods of operating	F02B7/08	F02B7/08		47
F02B9/00	7	Engines characterised by other types of ignition (characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition F02B11/00)<br><br><u>NOTE</u><br><br> - in this group the following indexing codes are used: <br>F02B2700/02&#160;-&#160;F02B2720/30	F02B9/00	F02B9/00		217
F02B9/02	8	with compression ignition (engines characterised by fuel-air mixture compression with compression ignition F02B1/12; engines characterised by air compression and subsequent fuel addition with compression ignition F02B3/06)	F02B9/02	F02B9/02		57
F02B9/04	9	Methods of operating	F02B9/04	F02B9/04		64
F02B9/06	8	with non-timed positive ignition, e.g. with hot-spots	F02B9/06	F02B9/06		120
F02B9/08	9	with incandescent chambers	F02B9/08	F02B9/08		28
F02B9/10	10	Chamber shapes or constructions	F02B9/10	F02B9/10		130
F02B11/00	7	Engines characterised by both fuel-air mixture compression and air compression, or characterised by both positive ignition and compression ignition, e.g. in different cylinders	F02B11/00	F02B11/00		187
F02B11/02	8	convertible from fuel-air mixture compression to air compression or vice versa	F02B11/02	F02B11/02		156
F02B13/00	7	Engines characterised by the introduction of liquid fuel into cylinders by use of auxiliary fluid	F02B13/00	F02B13/00		47
F02B13/02	8	Compression ignition engines using air or gas for blowing fuel into compressed air in cylinder	F02B13/02	F02B13/02		31
F02B13/04	9	Arrangements or adaptations of pumps	F02B13/04	F02B13/04		3
F02B13/06	8	Engines having secondary air mixed with fuel in pump, compressed therein without ignition, and fuel-air mixture being injected into air in cylinder	F02B13/06	F02B13/06		22
F02B13/08	9	Arrangements or adaptations of pumps	F02B13/08	F02B13/08		3
F02B13/10	8	Use of specific auxiliary fluids, e.g. steam, combustion gas	F02B13/10	F02B13/10		43
F02B15/00	7	Engines characterised by the method of introducing liquid fuel into cylinders and not otherwise provided for	F02B15/00	F02B15/00		85
F02B15/02	8	having means for sucking fuel directly into cylinder	F02B15/02	F02B15/02		19
F02B17/00	7	Engines characterised by means for effecting stratification of charge in cylinders	F02B17/00	F02B17/00		648
F02B17/005	8	{having direct injection in the combustion chamber}	F02B17/00	F02B17/00		752
F02B19/00	7	Engines characterised by precombustion chambers	F02B19/00	F02B19/00		234
F02B2019/002	8	{with electric heater fitted to at least part of prechamber-wall or transfer passage}	F02B19/00	F02B19/00		43
F02B2019/004	9	{with heater control}	F02B19/00	F02B19/00		15
F02B2019/006	8	{with thermal insulation}	F02B19/00	F02B19/00		321
F02B2019/008	9	{variable}	F02B19/00	F02B19/00		8
F02B19/02	8	the chamber being periodically isolated from its cylinder	F02B19/02	F02B19/02		435
F02B19/04	9	the isolation being effected by a protuberance on piston or cylinder head	F02B19/04	F02B19/04		423
F02B19/06	8	with auxiliary piston in chamber for transferring ignited charge to cylinder space	F02B19/06	F02B19/06		215
F02B19/08	8	the chamber being of air-swirl type	F02B19/08	F02B19/08		653
F02B19/10	8	with fuel introduced partly into pre-combustion chamber, and partly into cylinder	F02B19/10	F02B19/10		259
F02B19/1004	9	{details of combustion chamber, e.g. mounting arrangements}	F02B19/10	F02B19/10		324
F02B19/1009	10	{heating, cooling}	F02B19/10	F02B19/10		123
F02B19/1014	10	{design parameters, e.g. volume, torch passage cross sectional area, length, orientation, or the like}	F02B19/10	F02B19/10		242
F02B19/1019	9	{with only one pre-combustion chamber (F02B19/1004 take precedence)}	F02B19/10	F02B19/10		138
F02B19/1023	10	{pre-combustion chamber and cylinder being fed with fuel-air mixture(s)}	F02B19/10	F02B19/10		169
F02B19/1028	11	{pre-combustion chamber and cylinder having both intake ports or valves, e.g. HONDS CVCC}	F02B19/10	F02B19/10		212
F02B19/1033	12	{specially adapted valves, e.g. rotary valves, pre-combustion chamber being part of a valve}	F02B19/10	F02B19/10		74
F02B19/1038	12	{timing of valves}	F02B19/10	F02B19/10		28
F02B19/1042	12	{auxiliary intake, valve drive}	F02B19/10	F02B19/10		37
F02B19/1047	12	{means for varying the size of the torch passage}	F02B19/10	F02B19/10		8
F02B19/1052	12	{controlling, e.g. varying fuel-air ratio, quantity of charge}	F02B19/10	F02B19/10		94
F02B19/1057	12	{with fuel injectors disposed upstream of intake valves}	F02B19/10	F02B19/10		26
F02B19/1061	12	{with residual gas chamber, e.g. containing spark plug}	F02B19/10	F02B19/10		39
F02B19/1066	11	{pre-combustion chamber having an inlet and an outlet port and with two distinct intake conduits or with one intake conduit in which the heavier fuel particles are separated from the main stream, e.g. by gravitational forces}	F02B19/10	F02B19/10		55
F02B19/1071	11	{pre-combustion chamber having only one orifice,(i.e. an orifice by means of which it communicates with the cylinder); the intake system comprising two distinct intake conduits}	F02B19/10	F02B19/10		37
F02B19/1076	11	{pre-combustion chamber being formed within the piston, e.g. two-cycle engines}	F02B19/10	F02B19/10		6
F02B19/108	10	{with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber}	F02B19/10	F02B19/10		553
F02B19/1085	11	{controlling fuel injection}	F02B19/10	F02B19/10		197
F02B19/109	10	{with injection of a fuel-air mixture into the pre-combustion chamber by means of a pump, e.g. two-cycle engines}	F02B19/10	F02B19/10		49
F02B19/1095	9	{with more than one pre-combustion chamber (a stepped form of the main combustion chamber above the piston is to be considered as a pre-combustion chamber if this stepped portion is not a squish area)}	F02B19/10	F02B19/10		68
F02B19/12	8	with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08)	F02B19/12	F02B19/12		1784
F02B19/14	8	with compression ignition	F02B19/14	F02B19/14		1835
F02B19/16	8	Chamber shapes or constructions not specific to sub-groups F02B19/02&#160;-&#160;F02B19/10	F02B19/16	F02B19/16		415
F02B19/165	9	{The shape or construction of the pre-combustion chambers is specially adapted to be formed, at least in part, of ceramic material (surface coverings of combustion-gas-swept parts F02B77/02; shaped ceramic products characterised by their composition or ceramic compositions C04B35/00; ceramic material for engine casings F02F7/0087)}	F02B19/16	F02B19/16		229
F02B19/18	9	Transfer passages between chamber and cylinder	F02B19/18	F02B19/18		509
F02B21/00	7	Engines characterised by air-storage chambers	F02B21/00	F02B21/00		837
F02B21/02	8	Chamber shapes or constructions	F02B21/02	F02B21/02		179
F02B23/00	7	Other engines characterised by special shape or construction of combustion chambers to improve operation (engines with incandescent chambers F02B9/08)<br><br><u>NOTE</u><br><br> - in this group the following indexing codes are used: <br>F02B2700/02&#160;-&#160;F02B2720/30	F02B23/00	F02B23/00		642
F02B23/02	8	with compression ignition	F02B23/02	F02B23/02		230
F02B23/04	9	the combustion space being subdivided into two or more chambers (with pre-combustion chambers F02B19/00)	F02B23/04	F02B23/04		415
F02B23/06	9	the combustion space being arranged in working piston (F02B23/04 takes precedence)	F02B23/06	F02B23/06		301
F02B23/0603	10	{at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head}	F02B23/06	F02B23/06		406
F02B2023/0606	11	{the material being a catalyst}	F02B23/06	F02B23/06		26
F02B2023/0609	11	{the material being a porous medium, e.g. sintered metal}	F02B23/06	F02B23/06		38
F02B2023/0612	11	{the material having a high temperature and pressure resistance, e.g. ceramic}	F02B23/06	F02B23/06		196
F02B2023/0615	10	{the combustion space having a volume defined by revolution around an axis inclined relative to the cylinder axis}	F02B23/06	F02B23/06		38
F02B23/0618	10	{having in-cylinder means to influence the charge motion}	F02B23/06	F02B23/06		74
F02B23/0621	11	{Squish flow}	F02B23/06	F02B23/06		938
F02B23/0624	11	{Swirl flow}	F02B23/06	F02B23/06		663
F02B23/0627	11	{having additional bores or grooves machined into the piston for guiding air or charge flow to the piston bowl}	F02B23/06	F02B23/06		267
F02B23/063	11	{the combustion space in the piston interacting fluid dynamically with the cylinder head, the injector body or the cylinder wall (F02B23/04 takes precedence)}	F02B23/06	F02B23/06		169
F02B23/0633	10	{the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume}	F02B23/06	F02B23/06		188
F02B23/0636	10	{the combustion space having a substantially flat and horizontal bottom}	F02B23/06	F02B23/06		282
F02B23/0639	11	{the combustion space having substantially the shape of a cylinder}	F02B23/06	F02B23/06		162
F02B23/0642	10	{the depth of the combustion space being much smaller than the diameter of the piston, e.g. the depth being in the order of one tenth of the diameter}	F02B23/06	F02B23/06		48
F02B23/0645	10	{Details related to the fuel injector or the fuel spray}	F02B23/06	F02B23/06		74
F02B23/0648	11	{Means or methods to improve the spray dispersion, evaporation or ignition}	F02B23/06	F02B23/06		70
F02B23/0651	12	{the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space}	F02B23/06	F02B23/06		859
F02B23/0654	11	{Thermal treatments, e.g. with heating elements or local cooling}	F02B23/06	F02B23/06		71
F02B23/0657	12	{the spray interacting with one or more glow plugs}	F02B23/06	F02B23/06		140
F02B23/066	11	{the injector being located substantially off-set from the cylinder centre axis}	F02B23/06	F02B23/06		414
F02B23/0663	11	{having multiple injectors per combustion chamber}	F02B23/06	F02B23/06		166
F02B23/0666	11	{having a single fuel spray jet per injector nozzle}	F02B23/06	F02B23/06		83
F02B23/0669	11	{having multiple fuel spray jets per injector nozzle}	F02B23/06	F02B23/06		955
F02B23/0672	10	{Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis (the surrounding wall being exactly vertical F02B23/0696)}	F02B23/06	F02B23/06		1043
F02B23/0675	10	{the combustion space being substantially spherical, hemispherical, ellipsoid or parabolic}	F02B23/06	F02B23/06		535
F02B23/0678	10	{Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets}	F02B23/06	F02B23/06		240
F02B23/0681	11	{Square, rectangular or the like profiles}	F02B23/06	F02B23/06		34
F02B23/0684	11	{Ring like bowl, e.g. toroidal}	F02B23/06	F02B23/06		67
F02B23/0687	11	{Multiple bowls in the piston, e.g. one bowl per fuel spray jet}	F02B23/06	F02B23/06		148
F02B23/069	11	{characterised by its eccentricity from the cylinder axis}	F02B23/06	F02B23/06		111
F02B23/0693	11	{the combustion space consisting of step-wise widened multiple zones of different depth}	F02B23/06	F02B23/06		177
F02B23/0696	10	{W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall}	F02B23/06	F02B23/06		891
F02B23/08	8	with positive ignition	F02B23/08	F02B23/08		1398
F02B2023/085	9	{using several spark plugs per cylinder}	F02B23/08	F02B23/08		321
F02B23/10	9	with separate admission of air and fuel into cylinder	F02B23/10	F02B23/10		377
F02B23/101	10	{the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts}	F02B23/10	F02B23/10		988
F02B2023/102	10	{the spark plug being placed offset the cylinder centre axis}	F02B23/10	F02B23/10		262
F02B2023/103	10	{the injector having a multi-hole nozzle for generating multiple sprays}	F02B23/10	F02B23/10		227
F02B23/104	10	{the injector being placed on a side position of the cylinder}	F02B23/10	F02B23/10		902
F02B23/105	11	{the fuel is sprayed directly onto or close to the spark plug}	F02B23/10	F02B23/10		199
F02B2023/106	10	{Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal}	F02B23/10	F02B23/10		397
F02B2023/107	11	{Reverse tumble flow, e.g. having substantially vertical intake ports}	F02B23/10	F02B23/10		59
F02B2023/108	10	{Swirl flow, i.e. the axis of rotation of the main charge flow motion is vertical}	F02B23/10	F02B23/10		389
F02B25/00	7	Engines characterised by using fresh charge for scavenging cylinders<br><br><u>NOTE</u><br><br> - in this group the following indexing codes are used: <br>F02B2700/02&#160;-&#160;F02B2700/038	F02B25/00	F02B25/00		3749
F02B25/02	8	using unidirectional scavenging	F02B25/02	F02B25/02		247
F02B25/04	9	Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke	F02B25/04	F02B25/04		626
F02B25/06	10	the cylinder-head ports being controlled by working pistons, e.g. by sleeve-shaped extensions thereof	F02B25/06	F02B25/06		89
F02B25/08	9	Engines with oppositely-moving reciprocating working pistons	F02B25/08	F02B25/08		246
F02B25/10	10	with one piston having a smaller diameter or shorter stroke than the other	F02B25/10	F02B25/10		26
F02B25/12	9	Engines with U-shaped cylinders, having ports in each arm	F02B25/12	F02B25/12		214
F02B25/14	8	using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke	F02B25/14	F02B25/14		794
F02B25/145	9	{with intake and exhaust valves exclusively in the cylinder head}	F02B25/14	F02B25/14		303
F02B25/16	9	the charge flowing upward essentially along cylinder wall opposite the inlet ports {(F02B25/145 takes precedence)}	F02B25/16	F02B25/16		84
F02B25/18	9	the charge flowing upward essentially along cylinder wall adjacent the inlet ports, e.g. by means of deflection rib on piston {(F02B25/145 takes precedence)}	F02B25/18	F02B25/18		132
F02B25/20	8	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, subgroups F02B25/02&#160;-&#160;F02B25/18	F02B25/20	F02B25/20		307
F02B25/22	9	by forming air cushion between charge and combustion residues	F02B25/22	F02B25/22		317
F02B25/24	9	Inlet or outlet openings being timed asymmetrically relative to bottom dead-centre	F02B25/24	F02B25/24		61
F02B25/26	8	Multi-cylinder engines other than those provided for in, or of interest apart from, groups F02B25/02 - F02B25/24(internal-combustion aspects of rotary engines F02B57/00)	F02B25/26	F02B25/26		102
F02B25/28	9	with V-, fan-, or star-arrangement of cylinders	F02B25/28	F02B25/28		70
F02B27/00	7	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	F02B27/00	F02B27/00		326
F02B27/001	8	{the system having electrically controlled acoustic pulse generating devices, e.g. loudspeakers}	F02B27/00	F02B27/00		49
F02B27/003	8	{using check valves}	F02B27/00	F02B27/00		61
F02B27/005	8	{Oscillating pipes with charging achieved by arrangement, dimensions or shapes of intakes pipes or chambers; Ram air pipes}	F02B27/00	F02B27/00		174
F02B27/006	9	{of intake runners}	F02B27/00	F02B27/00		328
F02B27/008	8	{Resonance charging}	F02B27/00	F02B27/00		172
F02B27/02	8	the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means (in exhaust systems only F02B27/06)	F02B27/02	F02B27/02		460
F02B27/0205	9	{characterised by the charging effect}	F02B27/02	F02B27/02		62
F02B27/021	10	{Resonance charging (combined with oscillating pipe charging F02B27/0221)}	F02B27/02	F02B27/02		277
F02B27/0215	10	{Oscillating pipe charging, i.e. variable intake pipe length charging}	F02B27/02	F02B27/02		529
F02B27/0221	11	{Resonance charging combined with oscillating pipe charging}	F02B27/02	F02B27/02		221
F02B27/0226	9	{characterised by the means generating the charging effect}	F02B27/02	F02B27/02		45
F02B27/0231	10	{Movable ducts, walls or the like (F02B27/0257 takes precedence)}	F02B27/02	F02B27/02		125
F02B27/0236	11	{with continuously variable adjustment of a length or width}	F02B27/02	F02B27/02		168
F02B27/0242	10	{Fluid communication passages between intake ducts, runners or chambers}	F02B27/02	F02B27/02		216
F02B27/0247	10	{Plenum chambers; Resonance chambers or resonance pipes}	F02B27/02	F02B27/02		50
F02B27/0252	11	{Multiple plenum chambers or plenum chambers having inner separation walls, e.g. comprising valves for the same group of cylinders}	F02B27/02	F02B27/02		426
F02B27/0257	11	{Rotatable plenum chambers}	F02B27/02	F02B27/02		133
F02B27/0263	11	{the plenum chamber and at least one of the intake ducts having a common wall, and the intake ducts wrap partially around the plenum chamber, i.e. snail-type (F02B27/0257 takes precedence)}	F02B27/02	F02B27/02		320
F02B27/0268	10	{Valves}	F02B27/02	F02B27/02		191
F02B27/0273	11	{Flap valves}	F02B27/02	F02B27/02		546
F02B27/0278	11	{Multi-way valves}	F02B27/02	F02B27/02		110
F02B27/0284	11	{Rotary slide valves}	F02B27/02	F02B27/02		142
F02B27/0289	10	{Intake runners having multiple intake valves per cylinder}	F02B27/02	F02B27/02		135
F02B27/0294	9	{Actuators or controllers therefor; Diagnosis; Calibration}	F02B27/02	F02B27/02		471
F02B27/04	8	in exhaust systems only, e.g. for sucking-off combustion gases	F02B27/04	F02B27/04		547
F02B27/06	9	the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means	F02B27/06	F02B27/06		266
F02B29/00	7	Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00&#160;-&#160;F02B39/00; Details thereof	F02B29/00	F02B29/00		671
F02B29/02	8	Other fluid-dynamic features of induction systems for improving quantity of charge (for also imparting a rotation to the charge in the cylinder F02B31/00)	F02B29/02	F02B29/02		329
F02B29/04	8	Cooling of air intake supply	F02B29/04	F02B29/04		1120
F02B29/0406	9	{Layout of the intake air cooling or coolant circuit}	F02B29/04	F02B29/04		2110
F02B29/0412	10	{Multiple heat exchangers arranged in parallel or in series}	F02B29/04	F02B29/04		918
F02B29/0418	10	{the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface}	F02B29/04	F02B29/04		725
F02B29/0425	10	{Air cooled heat exchangers}	F02B29/04	F02B29/04		447
F02B29/0431	11	{Details or means to guide the ambient air to the heat exchanger, e.g. having a fan, flaps, a bypass or a special location in the engine compartment}	F02B29/04	F02B29/04		328
F02B29/0437	10	{Liquid cooled heat exchangers}	F02B29/04	F02B29/04		693
F02B29/0443	11	{Layout of the coolant or refrigerant circuit}	F02B29/04	F02B29/04		991
F02B29/045	9	{Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly}	F02B29/04	F02B29/04		314
F02B29/0456	10	{Air cooled heat exchangers}	F02B29/04	F02B29/04		361
F02B29/0462	10	{Liquid cooled heat exchangers}	F02B29/04	F02B29/04		1036
F02B29/0468	10	{Water separation or drainage means}	F02B29/04	F02B29/04		459
F02B29/0475	10	{the intake air cooler being combined with another device, e.g. heater, valve, compressor, filter or EGR cooler, or being assembled on a special engine location}	F02B29/04	F02B29/04		1163
F02B29/0481	9	{Intake air cooling by means others than heat exchangers, e.g. by rotating drum regenerators, cooling by expansion or by electrical means}	F02B29/04	F02B29/04		234
F02B29/0493	9	{Controlling the air charge temperature}	F02B29/04	F02B29/04		870
F02B29/06	8	After-charging, i.e. supplementary charging after scavenging	F02B29/06	F02B29/06		153
F02B29/08	8	Modifying distribution valve timing for charging purposes (F02B29/06 takes precedence)	F02B29/08	F02B29/08		134
F02B29/083	9	{Cyclically operated valves disposed upstream of the cylinder intake valve, controlled by external means}	F02B29/08	F02B29/08		435
F02B29/086	9	{the engine having two or more inlet valves}	F02B29/08	F02B29/08		51
F02B31/00	7	Modifying induction systems for imparting a rotation to the charge in the cylinder (air intakes or induction systems for internal-combustion engines F02M35/10)	F02B31/00	F02B31/00		845
F02B31/02	8	in engines having inlet valves arranged eccentrically to cylinder axis (F02B31/08 takes precedence)	F02B31/02	F02B31/02		45
F02B31/04	8	by means within the induction channel, e.g. deflectors	F02B31/04	F02B31/04		683
F02B31/042	9	{induction channel having a helical shape around the intake valve axis}	F02B31/04	F02B31/04		284
F02B31/06	9	Movable means, e.g. butterfly valves	F02B31/06	F02B31/06		808
F02B31/08	8	having multiple air inlets	F02B31/08	F02B31/08		524
F02B31/085	9	{having two inlet valves}	F02B31/08	F02B31/08		971
F02B31/087	9	{having three or more inlet valves}	F02B31/08	F02B31/08		77
F02B33/00	7	Engines characterised by provision of pumps for charging or scavenging	F02B33/00	F02B33/00		1538
F02B33/02	8	Engines with reciprocating-piston pumps; Engines with crankcase pumps	F02B33/02	F02B33/02		142
F02B33/04	9	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	F02B33/04	F02B33/04		707
F02B33/06	9	with reciprocating-piston pumps other than simple crankcase pumps	F02B33/06	F02B33/06		246
F02B33/08	10	with the working-cylinder head arranged between working and pumping cylinders	F02B33/08	F02B33/08		76
F02B33/10	10	with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder	F02B33/10	F02B33/10		80
F02B33/12	11	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	F02B33/12	F02B33/12		172
F02B33/14	11	working and pumping pistons forming stepped piston	F02B33/14	F02B33/14		226
F02B33/16	11	working and pumping pistons having differing movements	F02B33/16	F02B33/16		36
F02B33/18	10	with crankshaft being arranged between working and pumping cylinders	F02B33/18	F02B33/18		47
F02B33/20	10	with pumping-cylinder axis arranged at an angle to working-cylinder axis, e.g. at an angle of 90 degrees	F02B33/20	F02B33/20		110
F02B33/22	10	with pumping cylinder situated at side of working cylinder, e.g. the cylinders being parallel	F02B33/22	F02B33/22		482
F02B33/24	9	with crankcase pumps other than with reciprocating pistons only	F02B33/24	F02B33/24		38
F02B33/26	9	Four-stroke engines characterised by having crankcase pumps	F02B33/26	F02B33/26		208
F02B33/28	9	Component parts, details or accessories of crankcase pumps, not provided for in, or of interest apart from, subgroups F02B33/02&#160;-&#160;F02B33/26	F02B33/28	F02B33/28		57
F02B33/30	10	Control of inlet or outlet ports	F02B33/30	F02B33/30		336
F02B33/32	8	Engines with pumps other than of reciprocating-piston type (with crankcase pumps F02B33/02)	F02B33/32	F02B33/32		191
F02B33/34	9	with rotary pumps (with cell-type pressure exchangers or the like F02B33/42)	F02B33/34	F02B33/34		459
F02B33/36	10	of positive-displacement type	F02B33/36	F02B33/36		394
F02B33/38	11	of Roots type	F02B33/38	F02B33/38		336
F02B33/40	10	of non-positive-displacement type	F02B33/40	F02B33/40		1024
F02B33/42	9	with driven apparatus for immediate conversion of combustion gas pressure into pressure of fresh charge, e.g. with cell-type pressure exchangers	F02B33/42	F02B33/42		247
F02B33/44	8	Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs	F02B33/44	F02B33/44		1170
F02B33/443	9	{Heating of charging air, e.g. for facilitating the starting}	F02B33/44	F02B33/44		123
F02B33/446	9	{having valves for admission of atmospheric air to engine, e.g. at starting}	F02B33/44	F02B33/44		399
F02B35/00	7	Engines characterised by provision of pumps for sucking combustion residues from cylinders	F02B35/00	F02B35/00		53
F02B35/02	8	using rotary pumps	F02B35/02	F02B35/02		145
F02B37/00	7	Engines characterised by provision of pumps driven at least for part of the time by exhaust	F02B37/00	F02B37/00		4580
F02B37/001	8	{using exhaust drives arranged in parallel}	F02B37/00	F02B37/00		496
F02B37/002	9	{the exhaust supply to one of the exhaust drives can be interrupted}	F02B37/00	F02B37/00		231
F02B37/004	8	{with exhaust drives arranged in series}	F02B37/00	F02B37/00		1003
F02B37/005	8	{Exhaust driven pumps being combined with an exhaust driven auxiliary apparatus, e.g. a ventilator}	F02B37/00	F02B37/00		366
F02B37/007	8	with exhaust-driven pumps arranged in parallel {, e.g. at least one pump supplying alternatively}	F02B37/007	F02B37/007		1175
F02B37/013	8	with exhaust-driven pumps arranged in series	F02B37/013	F02B37/013		1397
F02B37/02	8	Gas passages between engine outlet and pump drive, e.g. reservoirs	F02B37/02	F02B37/02		1186
F02B37/025	9	{Multiple scrolls or multiple gas passages guiding the gas to the pump drive}	F02B37/02	F02B37/02		1025
F02B37/04	8	Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump	F02B37/04	F02B37/04		1429
F02B37/10	9	at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump}	F02B37/10	F02B37/10		1254
F02B37/105	10	{exhaust drive and pump being both connected through gearing to engine-driven shaft}	F02B37/10	F02B37/10		291
F02B37/11	9	driven by other drive at starting only	F02B37/11	F02B37/11		126
F02B37/12	8	Control of the pumps	F02B37/12	F02B37/12		1746
F02B2037/122	9	{Control of rotational speed of the pump}	F02B37/12	F02B37/12		269
F02B2037/125	9	{Control for avoiding pump stall or surge}	F02B37/12	F02B37/12		202
F02B37/14	9	{Control} of the alternation between {or the operation of} exhaust drive and other drive of a pump, e.g. dependent on speed	F02B37/14	F02B37/14		565
F02B37/16	9	by bypassing charging air	F02B37/16	F02B37/16		1725
F02B37/162	10	{by bypassing, e.g. partially, intake air from pump inlet to pump outlet}	F02B37/16	F02B37/16		516
F02B37/164	10	{the bypassed air being used in an auxiliary apparatus, e.g. in an air turbine}	F02B37/16	F02B37/16		263
F02B37/166	11	{the auxiliary apparatus being a combustion chamber, e.g. upstream of turbine}	F02B37/16	F02B37/16		212
F02B37/168	10	{into the exhaust conduit (F02B37/166 takes precedence)}	F02B37/16	F02B37/16		235
F02B37/18	9	by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere}	F02B37/18	F02B37/18		3284
F02B37/183	10	{Arrangements of bypass valves or actuators therefor}	F02B37/18	F02B37/18		1672
F02B37/186	11	{Arrangements of actuators or linkage for bypass valves}	F02B37/18	F02B37/18		1268
F02B37/20	9	by increasing exhaust energy, e.g. using combustion chamber {by after-burning (using an auxiliary combustion chamber supplied by charging air F02B37/166)}	F02B37/20	F02B37/20		245
F02B37/22	9	by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits}(F02B37/24 takes precedence)	F02B37/22	F02B37/22		1493
F02B37/225	10	{air passages}	F02B37/22	F02B37/22		313
F02B37/24	9	by using pumps or turbines with adjustable guide vanes	F02B37/24	F02B37/24		2201
F02B39/00	7	Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00&#160;-&#160;F02B37/00	F02B39/00	F02B39/00		1701
F02B39/005	8	{Cooling of pump drives}	F02B39/00	F02B39/00		643
F02B39/02	8	Drives of pumps (exhaust drives or combined exhaust and other drives F02B37/00); Varying pump drive gear ratio	F02B39/02	F02B39/02		105
F02B39/04	9	Mechanical drives; Variable-gear-ratio drives (non-mechanical pump drives having variable gear ratio F02B39/08)	F02B39/04	F02B39/04		734
F02B39/06	10	the engine torque being divided by a differential gear for driving a pump and the engine output shaft	F02B39/06	F02B39/06		97
F02B39/08	9	Non-mechanical drives, e.g. fluid drives having variable gear ratio	F02B39/08	F02B39/08		231
F02B39/085	10	{the fluid drive using expansion of fluids other than exhaust gases, e.g. a Rankine cycle}	F02B39/08	F02B39/08		103
F02B39/10	10	electric	F02B39/10	F02B39/10		2340
F02B39/12	9	Drives characterised by use of couplings or clutches therein (using fluid slip couplings for varying gear ratio F02B39/08)	F02B39/12	F02B39/12		525
F02B39/14	8	Lubrication of pumps; Safety measures therefor	F02B39/14	F02B39/14		941
F02B39/16	8	Other safety measures for, or other control of, pumps	F02B39/16	F02B39/16		1186
F02B2039/162	9	{Control of pump parameters to improve safety thereof}	F02B39/16	F02B39/16		28
F02B2039/164	10	{the temperature of the pump, of the pump drive or the pumped fluid being limited}	F02B39/16	F02B39/16		77
F02B2039/166	10	{the fluid pressure in the pump or exhaust drive being limited}	F02B39/16	F02B39/16		69
F02B2039/168	10	{the rotational speed of pump or exhaust drive being limited}	F02B39/16	F02B39/16		136
F02B41/00	7	Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power	F02B41/00	F02B41/00		766
F02B41/02	8	Engines with prolonged expansion	F02B41/02	F02B41/02		165
F02B41/04	9	in main cylinders	F02B41/04	F02B41/04		859
F02B41/06	9	in compound cylinders	F02B41/06	F02B41/06		691
F02B41/08	10	Two-stroke compound engines	F02B41/08	F02B41/08		153
F02B41/10	9	in exhaust turbines (use of exhaust turbines for charging F02B37/00)	F02B41/10	F02B41/10		1024
F02B2041/12	9	{in jet propulsion apparatus}	F02B41/02	F02B41/12		2
F02B43/00	7	Engines characterised by operating on gaseous fuels; Plants including such engines (engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04)<br><br><u>NOTE</u><br><br> - in this group the following indexing codes are used: <br>F02B2700/02&#160;-&#160;F02B2720/30	F02B43/00	F02B43/00		2190
F02B43/02	8	Engines characterised by means for increasing operating efficiency	F02B43/02	F02B43/02		115
F02B43/04	9	for improving efficiency of combustion	F02B43/04	F02B43/04		142
F02B43/06	9	for enlarging charge	F02B43/06	F02B43/06		28
F02B43/08	8	Plants characterised by the engines using gaseous fuel generated in the plant from solid fuel, e.g. wood	F02B43/08	F02B43/08		280
F02B43/10	8	Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen	F02B43/10	F02B43/10		2258
F02B2043/103	9	{Natural gas, e.g. methane or LNG used as a fuel}	F02B43/10	F02B43/10		378
F02B2043/106	9	{Hydrogen obtained by electrolysis}	F02B43/10	F02B43/10		424
F02B43/12	9	Methods of operating	F02B43/12	F02B43/12		307
F02B45/00	7	Engines characterised by operating on non-liquid fuels other than gas; Plants including such engines (plants involving generation of gaseous fuel from solid fuel F02B43/08; engines convertible from gas to other fuel consumption F02B69/04)	F02B45/00	F02B45/00		65
F02B45/02	8	operating on powdered fuel, e.g. powdered coal (operating on fuel containing oxidant F02B45/06)	F02B45/02	F02B45/02		358
F02B45/04	9	Plants, e.g. having coal-grinding apparatus	F02B45/04	F02B45/04		10
F02B45/06	8	operating on fuel containing oxidant	F02B45/06	F02B45/06		38
F02B45/08	8	operating on other solid fuels	F02B45/08	F02B45/08		43
F02B45/10	8	operating on mixtures of liquid and non-liquid fuels, e.g. in pasty or foamed state	F02B45/10	F02B45/10		58
F02B47/00	7	Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines	F02B47/00	F02B47/00		234
F02B47/02	8	the substances being water or steam	F02B47/02	F02B47/02		1399
F02B47/04	8	the substances being other than water or steam only	F02B47/04	F02B47/04		157
F02B47/06	9	the substances including non-airborne oxygen (F02B47/10 takes precedence)	F02B47/06	F02B47/06		133
F02B47/08	9	the substances including exhaust gas	F02B47/08	F02B47/08		607
F02B47/10	10	Circulation of exhaust gas in closed or semi-closed circuits, e.g. with simultaneous addition of oxygen	F02B47/10	F02B47/10		184
F02B49/00	7	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&apos;s intake	F02B49/00	F02B49/00		25
F02B51/00	7	Other methods of operating engines involving pretreating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines	F02B51/00	F02B51/00		169
F02B51/02	8	involving catalysts	F02B51/02	F02B51/02		363
F02B51/04	8	involving electricity or magnetism	F02B51/04	F02B51/04		349
F02B51/06	8	involving rays or sound waves	F02B51/06	F02B51/06		134
F02B53/00	7	Internal-combustion aspects of rotary-piston or oscillating-piston engines (internal-combustion aspects of rotary pistons or outer members for co-operation therewith F02B55/00)<br><br><u>NOTE</u><br><br> - in this group the following indexing codes are used: <br>F02B2730/01&#160;-&#160;F02B2730/09	F02B53/00	F02B53/00		6444
F02B2053/005	8	{Wankel engines}	F02B53/00	F02B53/00		2672
F02B53/02	8	Methods of operating	F02B53/02	F02B53/02		898
F02B53/04	8	Charge admission or combustion-gas discharge	F02B53/04	F02B53/04		1048
F02B53/06	9	Valve control therefor	F02B53/06	F02B53/06		395
F02B53/08	9	Charging, e.g. by means of rotary-piston pump	F02B53/08	F02B53/08		532
F02B53/10	8	Fuel supply; Introducing fuel to combustion space	F02B53/10	F02B53/10		562
F02B53/12	8	Ignition	F02B53/12	F02B53/12		406
F02B53/14	8	Adaptations of engines for driving, or engine combinations with, other devices	F02B53/14	F02B53/14		192
F02B55/00	7	Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons	F02B55/00	F02B55/00		228
F02B55/02	8	Pistons	F02B55/02	F02B55/02		756
F02B55/04	9	Cooling thereof	F02B55/04	F02B55/04		130
F02B55/06	10	by air or other gas	F02B55/06	F02B55/06		64
F02B55/08	8	Outer members for co-operation with rotary pistons; Casings	F02B55/08	F02B55/08		658
F02B55/10	9	Cooling thereof	F02B55/10	F02B55/10		172
F02B55/12	10	by air or other gas	F02B55/12	F02B55/12		53
F02B55/14	8	Shapes or constructions of combustion chambers	F02B55/14	F02B55/14		574
F02B55/16	8	Admission or exhaust passages in pistons or outer members	F02B55/16	F02B55/16		247
F02B57/00	7	Internal-combustion aspects of rotary engines in which the combusted gases displace one or more reciprocating pistons	F02B57/00	F02B57/00		342
F02B57/02	8	Fuel or combustion-air supply (cylinder-charge admission or exhaust control F02B57/04)	F02B57/02	F02B57/02		43
F02B57/04	8	Control of cylinder-charge admission or exhaust (peculiar to two-stroke engines or to other engines with working-piston-controlled charge admission or exhaust F02B57/06)	F02B57/04	F02B57/04		50
F02B57/06	8	Two-stroke engines or other engines with working-piston-controlled cylinder-charge admission or exhaust (with combustion space in centre of star F02B57/10)	F02B57/06	F02B57/06		71
F02B57/08	8	Engines with star-shaped cylinder arrangements	F02B57/08	F02B57/08		1346
F02B57/085	9	{having two parallel main shafts}	F02B57/08	F02B57/08		41
F02B57/10	9	with combustion space in centre of star	F02B57/10	F02B57/10		271
F02B59/00	7	Internal-combustion aspects of other reciprocating-piston engines with movable, e.g. oscillating, cylinders (with yieldable walls F02B75/38)	F02B59/00	F02B59/00		282
F02B61/00	7	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 F02B39/06; adaptations or combinations of rotary-piston or oscillating-piston engines F02B53/14)	F02B61/00	F02B61/00		285
F02B61/02	8	for driving cycles	F02B61/02	F02B61/02		3123
F02B61/04	8	for driving propellers	F02B61/04	F02B61/04		418
F02B61/045	9	{for marine engines}	F02B61/04	F02B61/04		5712
F02B61/06	8	Combinations of engines with mechanical gearing (F02B61/02, F02B61/04 take precedence)	F02B61/06	F02B61/06		599
F02B63/00	7	Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices (of rotary-piston or oscillating-piston engines F02B53/14)	F02B63/00	F02B63/00		309
F02B63/02	8	for hand-held tools	F02B63/02	F02B63/02		1408
F02B63/04	8	for electric generators	F02B63/04	F02B63/04		3754
F02B63/041	9	{Linear electric generators}	F02B63/04	F02B63/04		313
F02B63/042	9	{Rotating electric generators}	F02B63/04	F02B63/04		756
F02B63/043	9	{Electric generators using oscillating movement}	F02B63/04	F02B63/04		21
F02B63/044	9	{the engine-generator unit being placed on a frame or in an housing}	F02B63/04	F02B63/04		1265
F02B2063/045	10	{Frames for generator-engine sets}	F02B63/04	F02B63/04		612
F02B2063/046	10	{Handles adapted therefor, e.g. handles or grips for movable units}	F02B63/04	F02B63/04		166
F02B63/047	10	{Movable engine-generator combinations on wheels}	F02B63/04	F02B63/04		385
F02B63/048	10	{Portable engine-generator combinations}	F02B63/04	F02B63/04		345
F02B63/06	8	for pumps	F02B63/06	F02B63/06		1021
F02B65/00	7	Adaptations of engines for special uses not provided for in groups F02B61/00 or F02B63/00; Combinations of engines with other devices, e.g. with non-driven apparatus (of rotary-piston or oscillating-piston engines F02B53/14; combinations of prime-movers consisting of electric motors and internal combustion engines for mutual or common propulsion B60K6/20)	F02B65/00	F02B65/00		214
F02B67/00	7	Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for	F02B67/00	F02B67/00		792
F02B67/04	8	of mechanically-driven auxiliary apparatus	F02B67/04	F02B67/04		1117
F02B67/06	9	driven by means of chains, belts, or like endless members	F02B67/06	F02B67/06		3305
F02B67/08	8	of non-mechanically driven auxiliary apparatus	F02B67/08	F02B67/08		136
F02B67/10	8	of charging or scavenging apparatus	F02B67/10	F02B67/10		645
F02B69/00	7	Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types	F02B69/00	F02B69/00		215
F02B69/02	8	for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel	F02B69/02	F02B69/02		230
F02B69/04	9	for gaseous and non-gaseous fuels	F02B69/04	F02B69/04		312
F02B69/06	8	for different cycles, e.g. convertible from two-stroke to four stroke	F02B69/06	F02B69/06		350
F02B71/00	7	Free-piston engines; Engines without rotary main shaft	F02B71/00	F02B71/00		976
F02B71/02	8	Starting	F02B71/02	F02B71/02		201
F02B71/04	8	Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby	F02B71/04	F02B71/04		1005
F02B71/045	9	{with hydrostatic transmission}	F02B71/04	F02B71/04		269
F02B71/06	9	Free-piston combustion gas generators per se	F02B71/06	F02B71/06		459
F02B73/00	7	Combinations of two or more engines, not otherwise provided for	F02B73/00	F02B73/00		849
F02B75/00	7	Other engines	F02B75/00	F02B75/00		211
F02B75/002	8	{Double acting engines}	F02B75/00	F02B75/00		783
F02B75/005	8	{having horizontal cylinders (F02B75/007 takes precedence)}	F02B75/00	F02B75/00		118
F02B75/007	8	{having vertical crankshafts}	F02B75/00	F02B75/00		489
F02B75/02	8	Engines characterised by their cycles, e.g. six-stroke	F02B75/02	F02B75/02		2103
F02B75/021	9	{having six or more strokes per cycle}	F02B75/02	F02B75/02		382
F02B2075/022	9	{having less than six strokes per cycle}	F02B75/02	F02B75/02		27
F02B2075/023	10	{one}	F02B75/02	F02B75/02		43
F02B2075/025	10	{two}	F02B75/02	F02B75/02		14579
F02B2075/026	10	{three}	F02B75/02	F02B75/02		68
F02B2075/027	10	{four}	F02B75/02	F02B75/02		7986
F02B2075/028	10	{five}	F02B75/02	F02B75/02		50
F02B75/04	8	Engines with variable distances between pistons at top dead-centre positions and cylinder heads	F02B75/04	F02B75/04		1024
F02B75/041	9	{by means of cylinder or cylinderhead positioning}	F02B75/04	F02B75/04		229
F02B75/042	10	{the cylinderhead comprising a counter-piston}	F02B75/04	F02B75/04		307
F02B75/044	9	{by means of an adjustable piston length}	F02B75/04	F02B75/04		434
F02B75/045	9	{by means of a variable connecting rod length}	F02B75/04	F02B75/04		1234
F02B75/047	9	{by means of variable crankshaft position}	F02B75/04	F02B75/04		275
F02B75/048	9	{by means of a variable crank stroke length}	F02B75/04	F02B75/04		815
F02B75/06	8	Engines with means for equalising torque	F02B75/06	F02B75/06		694
F02B75/065	9	{with double connecting rods or crankshafts}	F02B75/06	F02B75/06		334
F02B75/08	8	Engines with means for preventing corrosion in gas-swept spaces	F02B75/08	F02B75/08		18
F02B75/10	8	Engines with means for rendering exhaust gases innocuous (apparatus per seF01N3/00)	F02B75/10	F02B75/10		150
F02B75/12	8	Other methods of operation	F02B75/12	F02B75/12		306
F02B2075/125	9	{Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber}	F02B75/12	F02B75/12		3226
F02B75/16	8	Engines characterised by number of cylinders, e.g. single-cylinder engines (F02B75/26 takes precedence)	F02B75/16	F02B75/16		1512
F02B75/18	9	Multi-cylinder engines (scavenging aspects F02B25/00)	F02B75/18	F02B75/18		664
F02B2075/1804	10	{Number of cylinders}	F02B75/18	F02B75/18		14
F02B2075/1808	11	{two}	F02B75/18	F02B75/18		1144
F02B2075/1812	11	{three}	F02B75/18	F02B75/18		700
F02B2075/1816	11	{four}	F02B75/18	F02B75/18		1776
F02B2075/182	11	{five}	F02B75/18	F02B75/18		189
F02B2075/1824	11	{six}	F02B75/18	F02B75/18		1270
F02B2075/1828	11	{seven}	F02B75/18	F02B75/18		76
F02B2075/1832	11	{eight}	F02B75/18	F02B75/18		546
F02B2075/1836	11	{nine}	F02B75/18	F02B75/18		33
F02B2075/184	11	{ten}	F02B75/18	F02B75/18		137
F02B2075/1844	11	{eleven}	F02B75/18	F02B75/18		5
F02B2075/1848	11	{twelve}	F02B75/18	F02B75/18		154
F02B2075/1852	11	{thirteen}	F02B75/18	F02B75/18		3
F02B2075/1856	11	{fourteen}	F02B75/18	F02B75/18		56
F02B2075/186	11	{fifteen}	F02B75/18	F02B75/18		4
F02B2075/1864	11	{sixteen}	F02B75/18	F02B75/18		60
F02B2075/1868	11	{twenty}	F02B75/18	F02B75/18		15
F02B2075/1872	11	{twenty-two}	F02B75/18	F02B75/18		
F02B2075/1876	11	{twenty-four}	F02B75/18	F02B75/18		12
F02B2075/188	11	{thirty}	F02B75/18	F02B75/18		1
F02B2075/1884	11	{thirty-two}	F02B75/18	F02B75/18		4
F02B2075/1888	11	{thirty-four}	F02B75/18	F02B75/18		
F02B2075/1892	11	{thirty-six}	F02B75/18	F02B75/18		3
F02B75/1896	10	{with two or more pistons connected to one crank and having a common combustion space}	F02B75/18	F02B75/18		68
F02B75/20	10	with cylinders all in one line	F02B75/20	F02B75/20		1902
F02B75/22	10	with cylinders in V, fan, or star arrangement	F02B75/22	F02B75/22		4835
F02B75/221	11	{with cylinder banks in narrow V-arrangement, having a single cylinder head}	F02B75/22	F02B75/22		168
F02B75/222	11	{with cylinders in star arrangement}	F02B75/22	F02B75/22		989
F02B75/224	11	{with cylinders in fan arrangement}	F02B75/22	F02B75/22		162
F02B75/225	11	{having two or more crankshafts}	F02B75/22	F02B75/22		206
F02B75/227	11	{with cylinder banks in X-arrangement, e.g. double-V engines}	F02B75/22	F02B75/22		32
F02B75/228	11	{with cylinders arranged in parallel banks}	F02B75/22	F02B75/22		127
F02B75/24	10	with cylinders arranged oppositely relative to main shaft and of "flat" type	F02B75/24	F02B75/24		574
F02B75/243	11	{with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings}	F02B75/24	F02B75/24		662
F02B75/246	11	{with only one crankshaft of the "pancake" type, e.g. pairs of connecting rods attached to common crankshaft bearing}	F02B75/24	F02B75/24		709
F02B75/26	8	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	F02B75/26	F02B75/26		1167
F02B75/265	9	{Engines with cylinder axes substantially tangentially to a circle centred on main-shaft axis}	F02B75/26	F02B75/26		261
F02B75/28	8	Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (arranged oppositely relative to main shaft F02B75/24)	F02B75/28	F02B75/28		2028
F02B75/282	9	{the pistons having equal strokes}	F02B75/28	F02B75/28		816
F02B75/285	9	{comprising a free auxiliary piston}	F02B75/28	F02B75/28		51
F02B75/287	9	{with several pistons positioned in one cylinder one behind the other}	F02B75/28	F02B75/28		147
F02B75/30	9	with one working piston sliding inside another	F02B75/30	F02B75/30		299
F02B75/32	8	Engines characterised by connections between pistons and main shafts and not specific to preceding main groups	F02B75/32	F02B75/32		2824
F02B75/34	8	Ultra-small engines, e.g. for driving models	F02B75/34	F02B75/34		752
F02B75/36	8	Engines with parts of combustion- or working-chamber walls resiliently yielding under pressure	F02B75/36	F02B75/36		160
F02B75/38	9	Reciprocating - piston engines (F02B75/04 takes precedence; with resiliently-urged auxiliary piston in pre-combustion chamber F02B19/06)	F02B75/38	F02B75/38		110
F02B75/40	8	Other reciprocating-piston engines	F02B75/40	F02B75/40		308
F02B77/00	7	Component parts, details or accessories, not otherwise provided for	F02B77/00	F02B77/00		1521
F02B77/005	8	{Plugs}	F02B77/00	F02B77/00		100
F02B77/02	8	Surface coverings of combustion-gas-swept parts (of pistons F02F3/10; of cylinders and cylinder heads F02F1/00)	F02B77/02	F02B77/02		696
F02B77/04	8	Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines	F02B77/04	F02B77/04		1986
F02B2077/045	9	{by flushing or rinsing}	F02B77/04	F02B77/04		191
F02B2077/06	8	{Arrangements of purifying apparatus for liquid fuel or lubricant filters}	F02B77/00	F02B77/06		8
F02B77/08	8	Safety, indicating, or supervising devices (thermal insulation F02B77/11; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00)	F02B77/08	F02B77/08		2518
F02B77/081	9	{relating to endless members}	F02B77/08	F02B77/08		97
F02B77/082	9	{relating to valves}	F02B77/08	F02B77/08		171
F02B77/083	9	{relating to maintenance, e.g. diagnostic device (relating to lubrication F01M11/10)}	F02B77/08	F02B77/08		554
F02B77/084	9	{indicating economy}	F02B77/08	F02B77/08		123
F02B77/085	9	{with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame}	F02B77/08	F02B77/08		492
F02B77/086	10	{Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors}	F02B77/08	F02B77/08		217
F02B77/087	9	{determining top dead centre or ignition-timing}	F02B77/08	F02B77/08		139
F02B77/088	9	{relating to tightness}	F02B77/08	F02B77/08		53
F02B77/089	9	{relating to engine temperature (concerning coolant temperature F01P11/16)}	F02B77/08	F02B77/08		245
F02B77/10	9	Safety means relating to crankcase explosions	F02B77/10	F02B77/10		145
F02B77/11	8	Thermal or acoustic insulation	F02B77/11	F02B77/11		1189
F02B77/13	9	Acoustic insulation	F02B77/13	F02B77/13		1935
F02B77/14	8	Engine-driven auxiliary devices combined into units	F02B77/14	F02B77/14		157
F02B79/00	7	Running-in of internal-combustion engines (lubrication thereof F01M7/00)	F02B79/00	F02B79/00		72
F02B2201/00	7	Fuels	CPCONLY	F02B2201/00		11
F02B2201/02	8	Liquid	CPCONLY	F02B2201/02		28
F02B2201/04	8	Gas	CPCONLY	F02B2201/04		66
F02B2201/06	8	Dual fuel applications	CPCONLY	F02B2201/06		32
F02B2201/062	9	Liquid and liquid	CPCONLY	F02B2201/062		63
F02B2201/0622	10	Liquid and liquefied gas	CPCONLY	F02B2201/0622		10
F02B2201/064	9	Liquid and gas	CPCONLY	F02B2201/064		70
F02B2201/066	9	Gas and gas	CPCONLY	F02B2201/066		12
F02B2275/00	7	Other engines, components or details, not provided for in other groups of this subclass	CPCONLY	F02B2275/00		3
F02B2275/02	8	Attachment or mounting of cylinder heads on cylinders	CPCONLY	F02B2275/02		46
F02B2275/06	8	Endless member is a belt	CPCONLY	F02B2275/06		474
F02B2275/08	8	Endless member is a chain	CPCONLY	F02B2275/08		232
F02B2275/10	8	Diamond configuration of valves in cylinder heads	CPCONLY	F02B2275/10		98
F02B2275/14	8	Direct injection into combustion chamber	CPCONLY	F02B2275/14		3449
F02B2275/16	8	Indirect injection	CPCONLY	F02B2275/16		460
F02B2275/18	8	DOHC [Double overhead camshaft]	CPCONLY	F02B2275/18		2295
F02B2275/20	8	SOHC [Single overhead camshaft]	CPCONLY	F02B2275/20		1231
F02B2275/22	8	Side valves	CPCONLY	F02B2275/22		807
F02B2275/26	8	Flame plate	CPCONLY	F02B2275/26		23
F02B2275/28	8	Timing distribution gear	CPCONLY	F02B2275/28		2
F02B2275/30	8	Inverted positioning of engines	CPCONLY	F02B2275/30		94
F02B2275/32	8	Miller cycle	CPCONLY	F02B2275/32		305
F02B2275/34	8	Lateral camshaft position	CPCONLY	F02B2275/34		945
F02B2275/36	8	Modified dwell of piston in TDC	CPCONLY	F02B2275/36		121
F02B2275/38	8	Square four-cylinder configuration	CPCONLY	F02B2275/38		24
F02B2275/40	8	Squish effect	CPCONLY	F02B2275/40		258
F02B2275/42	8	Texaco combustion process	CPCONLY	F02B2275/42		63
F02B2275/44	8	Tools for engines	CPCONLY	F02B2275/44		11
F02B2275/46	8	Total Energy plant	CPCONLY	F02B2275/46		1
F02B2275/48	8	Tumble motion in gas movement in cylinder	CPCONLY	F02B2275/48		787
F02B2275/50	8	Walking beam arrangement of rockers in valve drive	CPCONLY	F02B2275/50		42
F02B2700/00	7	Measures relating to the combustion process without indication of the kind of fuel or with more than one fuel	CPCONLY	F02B2700/00		2
F02B2700/02	8	Four stroke engines	CPCONLY	F02B2700/02		32
F02B2700/021	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2700/021		176
F02B2700/023	9	with measures for charging, increasing the power	CPCONLY	F02B2700/023		226
F02B2700/025	9	with measures for compressing the cylinder charge	CPCONLY	F02B2700/025		41
F02B2700/026	9	with measures for increasing the part of the heat transferred to power, compound engines	CPCONLY	F02B2700/026		78
F02B2700/028	9	double-acting	CPCONLY	F02B2700/028		
F02B2700/03	8	Two stroke engines	CPCONLY	F02B2700/03		38
F02B2700/031	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2700/031		616
F02B2700/032	10	by means of the exhaust gases	CPCONLY	F02B2700/032		185
F02B2700/034	9	with measures for charging, increasing the power	CPCONLY	F02B2700/034		223
F02B2700/035	9	with reservoir for scavenging or charging air	CPCONLY	F02B2700/035		42
F02B2700/037	9	Scavenging or charging channels or openings	CPCONLY	F02B2700/037		387
F02B2700/038	9	with measures for compressing the cylinder charge	CPCONLY	F02B2700/038		27
F02B2710/00	7	Gas engines	CPCONLY	F02B2710/00		5
F02B2710/02	8	Four stroke engines	CPCONLY	F02B2710/02		9
F02B2710/021	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2710/021		12
F02B2710/023	9	with measures for charging, increasing the power	CPCONLY	F02B2710/023		43
F02B2710/025	9	with measures for compressing the cylinder charge	CPCONLY	F02B2710/025		8
F02B2710/026	9	with measures for improving combustion	CPCONLY	F02B2710/026		35
F02B2710/028	9	with measures for increasing the part of the heat transferred to power, compound engines	CPCONLY	F02B2710/028		5
F02B2710/03	8	Two stroke engines	CPCONLY	F02B2710/03		12
F02B2710/032	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2710/032		61
F02B2710/034	9	with measures for charging, increasing the power	CPCONLY	F02B2710/034		16
F02B2710/036	9	Scavenging or charging channels or openings	CPCONLY	F02B2710/036		22
F02B2710/038	9	with measures for improving combustion	CPCONLY	F02B2710/038		12
F02B2720/00	7	Engines with liquid fuel	CPCONLY	F02B2720/00		1
F02B2720/10	8	Mixture compressing engines for liquid fuel	CPCONLY	F02B2720/10		22
F02B2720/12	8	Four stroke engines with ignition device	CPCONLY	F02B2720/12		12
F02B2720/122	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2720/122		56
F02B2720/124	9	with measures for charging, increasing the power	CPCONLY	F02B2720/124		188
F02B2720/126	9	with measures for compressing the cylinder charge	CPCONLY	F02B2720/126		60
F02B2720/128	9	with measures for increasing the part of the heat transferred to power, compound engines	CPCONLY	F02B2720/128		17
F02B2720/13	8	Two stroke engines with ignition device	CPCONLY	F02B2720/13		20
F02B2720/131	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2720/131		656
F02B2720/132	10	by means of exhaust gases	CPCONLY	F02B2720/132		13
F02B2720/133	9	with measures for charging, increasing the power	CPCONLY	F02B2720/133		202
F02B2720/135	9	with reservoir for scavenging or charging air	CPCONLY	F02B2720/135		12
F02B2720/136	9	Scavenging or charging channels or openings	CPCONLY	F02B2720/136		111
F02B2720/137	9	with measures for improving combustion	CPCONLY	F02B2720/137		30
F02B2720/138	9	with measures for increasing the part of the heat transferred to power, compound engines	CPCONLY	F02B2720/138		1
F02B2720/15	8	Mixture compressing engines with ignition device and mixture formation in the cylinder	CPCONLY	F02B2720/15		39
F02B2720/151	9	with fuel supply and pulverisation by air or gas under pressure during the suction or compression stroke	CPCONLY	F02B2720/151		41
F02B2720/152	9	with fuel supply and pulverisation by injecting the fuel under pressure during the suction or compression stroke	CPCONLY	F02B2720/152		339
F02B2720/153	9	with injection of an air-fuel mixture under pressure during the suction or compression stroke	CPCONLY	F02B2720/153		97
F02B2720/155	9	with pulverisation by air sucked into the cylinder	CPCONLY	F02B2720/155		33
F02B2720/156	9	with pulverisation by the compressed air stream	CPCONLY	F02B2720/156		12
F02B2720/157	9	with means for improving the mixture in the cylinder	CPCONLY	F02B2720/157		43
F02B2720/158	9	with an auxiliary cylinder in which an explosion is generated	CPCONLY	F02B2720/158		24
F02B2720/16	8	Mixture compressing engines with ignition by compression or other heat	CPCONLY	F02B2720/16		5
F02B2720/20	8	Air compressing engines with ignition by the heat of compression	CPCONLY	F02B2720/20		41
F02B2720/22	8	Four stroke engines	CPCONLY	F02B2720/22		5
F02B2720/221	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2720/221		54
F02B2720/223	9	with measures for charging, increasing the power	CPCONLY	F02B2720/223		77
F02B2720/225	9	with measures for compressing the cylinder charge	CPCONLY	F02B2720/225		28
F02B2720/226	9	with measures for improving combustion	CPCONLY	F02B2720/226		457
F02B2720/228	9	with measures for increasing the part of the heat transferred to power, compound engines	CPCONLY	F02B2720/228		17
F02B2720/23	8	Two stroke engines	CPCONLY	F02B2720/23		9
F02B2720/231	9	with measures for removing exhaust gases from the cylinder	CPCONLY	F02B2720/231		156
F02B2720/232	10	by means of the exhaust gases	CPCONLY	F02B2720/232		13
F02B2720/233	9	with measures for charging, increasing the power	CPCONLY	F02B2720/233		110
F02B2720/235	9	with reservoir for scavenging or charging air	CPCONLY	F02B2720/235		11
F02B2720/236	9	scavenging or charging channels or openings	CPCONLY	F02B2720/236		81
F02B2720/237	9	with measures for improving combustion	CPCONLY	F02B2720/237		85
F02B2720/238	9	with measures for increasing the part of the heat transferred to power, compound engines	CPCONLY	F02B2720/238		1
F02B2720/25	8	Supply of fuel in the cylinder	CPCONLY	F02B2720/25		16
F02B2720/251	9	Fuel supply by high pressure gas	CPCONLY	F02B2720/251		55
F02B2720/252	10	with air pump fixed to engine cylinder; high pressure air being taken from the atmosphere or from an engine cylinder	CPCONLY	F02B2720/252		57
F02B2720/253	10	with high pressure air reservoir close to the point of injection; high pressure air taken from the engine cylinder	CPCONLY	F02B2720/253		16
F02B2720/255	10	with mixture compressing pump; fuel-air mixture being compressed in the pump cylinder without self ignition	CPCONLY	F02B2720/255		56
F02B2720/256	10	using steam or other gas as high pressure gas	CPCONLY	F02B2720/256		
F02B2720/257	9	Supply of fuel under pressure in the cylinder without blowing fluid	CPCONLY	F02B2720/257		26
F02B2720/258	10	with compression and ignition exclusively in the cylinder	CPCONLY	F02B2720/258		147
F02B2720/27	8	Air compressing engines with hot-bulb ignition	CPCONLY	F02B2720/27		27
F02B2720/272	9	Supply of all the fuel into the prechamber	CPCONLY	F02B2720/272		41
F02B2720/274	10	with injection of all the fuel into the prechamber	CPCONLY	F02B2720/274		77
F02B2720/276	9	Supply of only a part of the fuel into the prechamber	CPCONLY	F02B2720/276		1
F02B2720/278	10	with injection of only a part of the fuel into the prechamber	CPCONLY	F02B2720/278		10
F02B2720/30	8	Engines with air compression and ignition device	CPCONLY	F02B2720/30		132
F02B2730/00	7	Internal-combustion engines with pistons rotating or oscillating with relation to the housing	CPCONLY	F02B2730/00		3
F02B2730/01	8	with one or more pistons in the form of a disk or rotor rotating with relation to the housing; with annular working chamber	CPCONLY	F02B2730/01		573
F02B2730/011	9	with vanes sliding in the housing	CPCONLY	F02B2730/011		269
F02B2730/012	9	with vanes sliding in the piston	CPCONLY	F02B2730/012		538
F02B2730/013	10	Vanes fixed in the centre of the housing; Excentric rotors	CPCONLY	F02B2730/013		297
F02B2730/015	9	with vanes hinged to the housing	CPCONLY	F02B2730/015		184
F02B2730/016	9	with vanes hinged to the piston	CPCONLY	F02B2730/016		7
F02B2730/017	9	with rotating elements fixed to the housing or on the piston	CPCONLY	F02B2730/017		182
F02B2730/018	9	with piston rotating around an axis passing through the gravity centre, this piston or the housing rotating at the same time around an axis parallel to the first axis	CPCONLY	F02B2730/018		837
F02B2730/02	8	with piston rotating around its axis and having a reciprocating movement in a cylinder	CPCONLY	F02B2730/02		21
F02B2730/03	8	with piston oscillating in a housing or in a space in the form of an annular sector	CPCONLY	F02B2730/03		268
F02B2730/05	8	with pistons intermeshing as gear wheels; with helicoidal rotors	CPCONLY	F02B2730/05		382
F02B2730/09	8	Arrangements or specially formed elements for engines according to the preceding groups	CPCONLY	F02B2730/09		46
F02B2730/095	9	Hydraulic pistons	CPCONLY	F02B2730/095		9
