| Patents for F01B 9 - Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to groups (2,571) |
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| 02/21/1990 | CN1006922B Rotaryllinear convertor |
| 02/21/1990 | CN1006921B Rotary piston engine |
| 02/13/1990 | US4899705 Trammel crank engine |
| 01/31/1990 | CN2052042U Piston combustion engine with a circular slide block without lateral force |
| 01/30/1990 | US4896632 Unsymmetrical free piston engine |
| 01/25/1990 | WO1990000676A1 Internal combustion engine |
| 01/17/1990 | EP0233905B1 Mechanism for transforming the alternating motion of a piston into a circular motion of a shaft |
| 01/11/1990 | WO1990000218A1 Radial cylinder machine |
| 01/09/1990 | CA1264271A1 Rotary actuator having integral piston assembly with floating rack |
| 01/03/1990 | EP0349179A2 Two stroke engines |
| 01/03/1990 | EP0348485A1 Pump or motor with at least one piston body provided in a cylindrical housing. |
| 01/02/1990 | US4890591 Rotary internal combustion engine and method of starting the engine |
| 01/02/1990 | US4890589 Variable capacity type reciprocating piston device |
| 12/27/1989 | CN2050078U Cam mechanism transmission internal-combustion engine |
| 12/05/1989 | US4884536 Interconnecting rotary and reciprocatory motion |
| 11/28/1989 | US4882977 Rotary actuator |
| 11/23/1989 | EP0094932B1 Reciprocating cylinder engine |
| 11/02/1989 | WO1989010502A1 Motion conversion mechanism for use between rotating motions and reciprocating motions, and internal combustion engine using the same mechanism |
| 10/19/1989 | WO1989009874A1 Compound rotary internal combustion engine |
| 10/18/1989 | CN1036444A Cross crank gear |
| 10/10/1989 | US4872360 Moving cylinder actuator |
| 09/21/1989 | DE3906912A1 Hin- und herbewegliche kolben- und zylinderanordnung fuer verbrennungskraftmaschinen und dergleichen Combustion engine-reciprocating piston and cylinder assembly for and the like |
| 09/12/1989 | US4864976 Internal combustion engine and piston structure therefore |
| 08/24/1989 | WO1989007704A1 Internal combustion engine |
| 08/16/1989 | CN2042899U Grankless double-piston compressor |
| 08/02/1989 | EP0325584A1 A fluid motor. |
| 07/25/1989 | US4850313 Cruciform engine |
| 07/18/1989 | US4848282 Combustion engine having no connecting rods or crankshaft, of the radial cylinder type |
| 07/18/1989 | US4848213 Reciprocating piston compressor with offset cylinder |
| 07/13/1989 | WO1989006303A1 Pump or motor with at least one piston body provided in a cylindrical housing |
| 06/29/1989 | DE3742304A1 Device for converting an oscillating movement into a rotational movement by means of a crank mechanism of which the crank pin moves radially as a function of the angle of rotation |
| 06/26/1989 | EP0325584A4 A fluid motor. |
| 06/14/1989 | CN2039352U Geared engine |
| 05/16/1989 | US4829954 Method of forming self-sealing piston |
| 05/10/1989 | EP0314773A1 Driving or working engine, in particular an internal combustion engine. |
| 05/03/1989 | DE3734913A1 The principle of unconventional conversion of linear reciprocating motion into rotary motion in combustion, steam and other engines using ratchet and/or freewheel concept |
| 05/03/1989 | CN1032692A 活塞式发动机 Piston engine |
| 04/26/1989 | EP0214255B1 Internal combustion engine |
| 04/20/1989 | WO1989003477A1 Positive displacement fluid machines |
| 04/12/1989 | CN2035795U Ratchet type internal combustion engine |
| 04/12/1989 | CN1003878B 往复式内燃机 Reciprocating internal combustion engines |
| 04/05/1989 | EP0309508A1 Crank mechanism. |
| 03/30/1989 | DE3831878A1 Internal combustion engine with cam mechanism on the two-stroke principle |
| 03/22/1989 | EP0308262A2 Variable capacity type reciprocating piston device |
| 03/15/1989 | EP0307020A1 Motor with cross-crank mechanism |
| 02/22/1989 | EP0303649A1 Rocking-piston machine. |
| 02/14/1989 | US4803964 Internal combustion engine |
| 02/14/1989 | US4803890 Piston/power shaft coupling |
| 01/26/1989 | WO1989000652A1 Cross-shaped crank mechanism |
| 01/12/1989 | DE3731786A1 Drive arrangement |
| 01/10/1989 | US4796514 Rotary/linear convertor |
| 01/03/1989 | US4794887 Reciprocatory internal combustion engines |
| 01/03/1989 | US4794847 Rotary actuator |
| 12/22/1988 | DE3719008A1 Hydraulic, pneumatic and internal combustion engines. Hydraulic elevators |
| 12/20/1988 | US4791898 V-engine with yoke |
| 12/20/1988 | US4791894 Reciprocating piston engine |
| 12/07/1988 | EP0293847A2 Motion converting device |
| 12/07/1988 | EP0155935B1 Stator-rotor piston internal combustion engine |
| 12/06/1988 | US4788944 Internal combustion engine |
| 12/01/1988 | WO1988009427A1 Interconnecting rotary and reciprocatory motion |
| 12/01/1988 | DE3810728A1 Rotary piston engine |
| 11/30/1988 | EP0293233A1 Interconnecting rotary and reciprocatory motion |
| 11/30/1988 | EP0292603A1 Prime mover, particularly an internal combustion engine |
| 11/24/1988 | DE3706702A1 Hydraulic, pneumatic and internal combustion engines. Hydraulic elevators |
| 11/17/1988 | WO1988008922A1 Driving or working engine, in particular an internal combustion engine |
| 11/03/1988 | WO1988008484A1 Yoke with guides and slides |
| 10/20/1988 | WO1988008095A1 Crank mechanism |
| 10/11/1988 | US4776310 For use in an engine |
| 10/11/1988 | US4776304 Movement converter for use in an engine and the like |
| 10/11/1988 | US4776257 Axial pump engine |
| 10/06/1988 | DE3708972A1 Two-stroke diesel engines with opposing free pistons and buffer chambers |
| 09/29/1988 | DE3708455A1 Hydraulic, pneumatic and internal combustion engines. Hydraulic elevators |
| 09/14/1988 | CN87108333A Crank driving mechanism, especially used in reciprocating piston engine |
| 09/08/1988 | DE3802114A1 Tandem piston compressor |
| 09/07/1988 | WO1988006675A1 Pendulum piston engine |
| 08/31/1988 | EP0279967A1 Rotary piston machine utilizing dual action Geneva cam |
| 08/24/1988 | EP0279044A2 Self-sealing piston and its cylinder |
| 08/23/1988 | US4765292 Self-sealing piston apparatus |
| 08/18/1988 | DE3703617A1 Hydraulic-gas pressure and internal combustion engines. Hydraulic elevators |
| 08/02/1988 | US4760830 Method and apparatus for controlling fuel injection timing in a compression ignition engine |
| 07/28/1988 | DE3701389A1 Machine for producing mechanical power |
| 07/27/1988 | EP0275276A1 Piston and drive arm arrangement for internal combustion engines or compressors |
| 06/29/1988 | EP0272522A1 Crank gearing for reciprocating piston motor |
| 06/23/1988 | DE3642681A1 Crankshaft, particularly for reciprocating-piston combustion engines |
| 06/22/1988 | CN87107451A Self-sealing piston and method |
| 06/16/1988 | WO1988004356A1 Crank mechanism, in particular for alternating piston engines |
| 06/16/1988 | DE3641884A1 Crank mechanism, particularly for reciprocating-piston engines |
| 06/16/1988 | DE3641691A1 Two-stroke diesel engines with contra-rotating free pistons and buffer chambers |
| 06/01/1988 | EP0269536A2 Internal-combustion engine with a star-shaped cylinder configuration, and without a crank shaft or connecting rods |
| 06/01/1988 | DE3640136A1 Compression device |
| 05/17/1988 | US4744736 Compound rotary internal combustion engine |
| 05/11/1988 | DE3636873A1 Synchromesh transmission on a hypocycloidal transmission for a reciprocating piston engine |
| 05/04/1988 | EP0265546A1 Machine with double acting box piston |
| 04/21/1988 | DE3635200A1 Machine for generating mechanical energy |
| 04/07/1988 | DE3736256A1 Tandem piston engine |
| 03/08/1988 | US4729352 Crankshaft supporting structure for multicylinder internal combustion engines |
| 02/18/1988 | DE3627184A1 Two-stroke diesel engines with opposing free pistons and buffer chambers |
| 02/11/1988 | WO1988001013A1 Piston and drive arm arrangement for internal combustion engines or compressors |
| 02/11/1988 | DE3624957A1 Hydraulic free-piston internal combustion engine |
| 01/28/1988 | WO1988000639A1 A hydrocyclic motor |