| Patents for F04B 1 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (10,723) |
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| 03/14/1989 | US4811624 Hydraulically actuated stroke adjusting device |
| 03/09/1989 | WO1989002032A1 Axial piston motor, reversible as a pump, with modular multiple piston chambers |
| 03/08/1989 | EP0305548A1 Variable-capacity hydraulic motor |
| 03/08/1989 | CN2033862U 往复式活塞泵 Reciprocating piston pump |
| 03/08/1989 | CN1031582A Valve gear for internal combustion machine driven by eccentric rotary piston pump |
| 03/02/1989 | DE3827726A1 Multi-cylinder piston pump |
| 03/01/1989 | EP0304964A2 Apparatus for producing ultrahigh pressure water jet |
| 03/01/1989 | EP0304750A1 A radial piston pump, particularly a fuel injection pump for diesel engines |
| 03/01/1989 | EP0304743A1 Radial piston pump |
| 03/01/1989 | EP0110910B1 Hydrostatic transmission comprising radial piston pump and motor |
| 02/28/1989 | US4807519 Piston machine with changeable displacement |
| 02/23/1989 | DE3827246A1 Multi-cylinder piston pump |
| 02/09/1989 | WO1989001095A1 Cage for segment roller bearing |
| 02/09/1989 | DE3725203A1 Pressurised-liquid axial-piston machine on the swash-plate principle |
| 02/08/1989 | EP0302786A1 Rotating machine with pistons and barrel with a fixed centering toggle type joint |
| 02/01/1989 | EP0301310A1 Axial piston machine of the plate or inclined axis type with distribution slots and pressure compensation canals |
| 02/01/1989 | EP0301309A1 Axial piston machine with differential pistons |
| 01/31/1989 | US4801247 Variable displacement piston pump |
| 01/31/1989 | US4800801 Pump |
| 01/26/1989 | DE3822317A1 Radial piston pump |
| 01/25/1989 | EP0300586A1 Swashplate holddown mechanism |
| 01/25/1989 | EP0300274A1 Axial-pistons machine with differential pistons |
| 01/25/1989 | EP0300080A1 Device for drilling through cappings |
| 01/25/1989 | CN2031452U Flow distributor for local surface treatment |
| 01/24/1989 | US4799419 Wear resistant and friction resistant blocks |
| 01/19/1989 | DE3722988A1 Radial piston pump |
| 01/18/1989 | CN1030464A Radial piston pump for conveying water |
| 01/11/1989 | CN1003049B Hydraulic pressure motor and pump of fixed type ball-and-ream structure |
| 01/10/1989 | US4797069 Pump with variable angle wobble plate |
| 01/10/1989 | CA1248410A1 Power transmission |
| 01/05/1989 | DE3720567A1 Infinitely variable radial piston machine |
| 01/04/1989 | EP0297731A2 Pump with variable angle wobble plate |
| 01/04/1989 | EP0182788B1 Hydrostatic vehicle control |
| 12/29/1988 | WO1988010370A1 Folded channel radial pump |
| 12/27/1988 | US4793774 Variable displacement high pressure pump |
| 12/27/1988 | US4793240 Adjustable device for axial piston pump/motor of a tilting axis type |
| 12/27/1988 | US4793239 Fluid handling device |
| 12/20/1988 | US4792287 Wobble driven axial piston pump |
| 12/20/1988 | US4791858 Piston machine |
| 12/14/1988 | CN88210908U Rolling friction stroking mechanism of axial plunger pump |
| 12/06/1988 | US4788902 Thrust hydrostatic bearing device for use in axial piston machine |
| 12/01/1988 | DE3813774A1 Radial piston pump |
| 11/29/1988 | US4787828 Power transmission |
| 11/23/1988 | EP0292288A1 Variable displacement compressor with biased inclined member |
| 11/22/1988 | CA1245132A1 Unitary bearing retainer for a swashplate bearing |
| 11/22/1988 | CA1245131A1 Swashplate leveling and holddown device |
| 11/09/1988 | CN88102679A Power transmission |
| 11/08/1988 | US4782737 Control pintle including a thrust member for a radial flow device |
| 11/02/1988 | EP0288854A2 Rotary hydraulic machine |
| 11/02/1988 | EP0288481A1 Radial piston pump. |
| 10/25/1988 | US4780068 Folded channel radial pump |
| 10/20/1988 | DE3805305A1 Valving surface for a self-priming hydrostatic piston engine |
| 10/18/1988 | US4778352 Variable capacity vane compressor |
| 10/13/1988 | DE3711468A1 Positive control of the cage of a segmental roller bearing |
| 10/13/1988 | DE3711041A1 Einstellbare hydrostatische kolbenmaschine Adjustable hydrostatic piston machine |
| 10/12/1988 | EP0285685A1 Units with a fluid flowing through them and provided with elements resilient in an axial direction and defining chambers for pressures up to several thousand atmospheres |
| 10/11/1988 | US4776768 Radial plunger pump driven by a motor having seal members for protecting the motor from exposure to working fluid |
| 10/11/1988 | US4776260 for providing a reduction in wear on piston and cylinder |
| 10/11/1988 | CA1242931A1 Swashplate type axial-piston pump |
| 10/06/1988 | DE3709785A1 Positive-displacement pump with oscillating displacers |
| 10/05/1988 | CN87206578U Dual effiect variable impeller pump |
| 09/28/1988 | EP0284460A1 Pressurised fluid mechanism, pump or engine, with several displacement volumes |
| 09/27/1988 | US4773305 Piston pump with rolling membrane |
| 09/22/1988 | WO1988007133A1 Variable-capacity hydraulic motor |
| 09/21/1988 | EP0282478A1 A fluid-displacement machine |
| 09/20/1988 | US4771677 Axial piston machine |
| 09/20/1988 | US4771676 Hydraulic transmission device |
| 09/13/1988 | US4770081 Servomechanism with idle gear feedback |
| 09/08/1988 | DE3742303A1 Hydrostatic piston machine with flood lubrication |
| 09/07/1988 | EP0281019A2 Radial piston pump |
| 09/07/1988 | EP0280901A2 Plunger pump |
| 08/31/1988 | EP0280532A2 Power transfer apparatus |
| 08/23/1988 | US4765228 Axial piston machine with a device for flushing the circuit |
| 08/17/1988 | EP0278739A1 Constant suction pump for high performance liquid chromatography |
| 08/16/1988 | US4763472 Power transfer unit |
| 08/11/1988 | WO1988005866A1 High pressure cleaning apparatus with a wobble plate piston pump |
| 08/10/1988 | EP0277253A1 Hydraulic pump control unit |
| 08/10/1988 | EP0208692B1 Piston pump |
| 07/27/1988 | EP0275498A1 Electric motor driven hydraulic pump |
| 07/21/1988 | DE3700575A1 Axial piston machine |
| 07/21/1988 | DE3700573A1 Piston machine, in particular axial or radial piston machine |
| 07/19/1988 | US4758134 Radial piston machine |
| 07/19/1988 | US4757743 Rotary hydraulic machine |
| 07/13/1988 | EP0274251A1 Hydraulically operated swash-type apparatus |
| 07/13/1988 | EP0273956A1 Rotary piston engine |
| 07/13/1988 | EP0220175B1 Axial-piston hydraulic pump with inclined thrust plate |
| 07/06/1988 | EP0273634A1 Hydraulically operated swashplate apparatus |
| 07/05/1988 | CA1238814A1 Radial piston pump |
| 06/30/1988 | DE3642203A1 Adjustable axial-piston engine of swash plate construction |
| 06/29/1988 | EP0272844A2 Hydraulically operated continuously variable transmission |
| 06/28/1988 | US4753581 Constant suction pump for high performance liquid chromatography |
| 06/21/1988 | US4752192 Rotating drum pump having a plurality of fluid driven pistons |
| 06/14/1988 | US4750866 Control device for a pump with adjustable flow |
| 06/07/1988 | US4748898 Switching valve device |
| 06/02/1988 | WO1988003992A1 Variable-capacity piston machine |
| 06/01/1988 | EP0269500A2 Plunger pump of quick pressure-rise type |
| 05/31/1988 | US4747339 Radial piston machine |
| 05/31/1988 | US4747203 Production method for ball support structures |
| 05/24/1988 | US4745846 Devices which take in and expel fluid by a chamber which may border a coned ring |
| 05/19/1988 | DE3728448A1 Valving surface for hydrostatic reciprocating pumps |