| Patents for F04B 1 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (10,723) |
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| 02/04/1992 | US5085128 Variable displacement bent axis type hydraulic machine |
| 02/04/1992 | US5085127 Cavitation resistant hydraulic cylinder block porting faces |
| 02/04/1992 | US5085053 Swashplate assembly for a swashplate type hydraulic pressure device |
| 01/22/1992 | CN1015319B Method of overbalance pressure compensator and double-raw plunger radial plunger pump |
| 01/21/1992 | US5081908 Hydraulic pump having floating spigot valve |
| 01/21/1992 | US5081907 Hydrostatic displacement engine |
| 01/21/1992 | US5081906 Mechanism, motor pump, incorporating pistons supporting, rollers for abutment of said pistons on a cam |
| 01/15/1992 | EP0466561A1 Hydraulic machine with rotating cylinder block |
| 01/15/1992 | EP0465796A1 Axial piston machine of the slant axis type |
| 01/14/1992 | US5080563 Fuel pumping apparatus |
| 01/14/1992 | US5079996 Positive displacement control for a variable displacement compressor |
| 01/14/1992 | US5079994 Radial piston machine |
| 01/14/1992 | US5079993 Axial piston machine |
| 01/08/1992 | EP0464882A1 Swash-plate pump |
| 01/07/1992 | US5077975 Control for a load-dependently operating variable displacement pump |
| 01/07/1992 | CA1293886C Multiphase fluid mass transfer pump |
| 01/03/1992 | WO1992000456A1 Reversible variable displacement hydraulic device |
| 01/03/1992 | CA2063703A1 Reversible variable displacement hydraulic device |
| 12/31/1991 | US5076148 Piston for axial piston machines |
| 12/31/1991 | US5076145 Axial piston pump having a blocking valve in a manually controlled valve plate |
| 12/31/1991 | US5076057 Hydromechanical continuously variable transmission employing plunger-type hydraulic unit |
| 12/30/1991 | WO1992000455A1 Radial piston fluid machine and/or adjustable rotor |
| 12/26/1991 | WO1991019902A1 Hydraulic rotary radial piston pumps |
| 12/24/1991 | US5074195 Fixed swash plate for an axial piston machine |
| 12/17/1991 | US5073091 Variable displacement rotary hydraulic machine |
| 12/17/1991 | US5072655 Pistons for axial piston machines |
| 12/12/1991 | WO1991019095A1 Continuously variable capacity type swash plate compressor |
| 12/12/1991 | WO1991019094A1 Valve porting for rotating barrel ram pump |
| 12/12/1991 | DE4018326A1 Positive displacement pump with rotating chambers - has adjustable suction or discharge volume per revolution with primary and secondary adjustment on control ports |
| 12/11/1991 | EP0461063A1 Control for an axial piston pump |
| 12/11/1991 | CN2090438U Reciprocating pump |
| 11/27/1991 | EP0458208A2 Equivelocity universal joint and axial piston pump. motor device using the joint |
| 11/27/1991 | EP0458114A1 Radial piston pump |
| 11/26/1991 | US5067881 Plunger-operated hydraulic pump |
| 11/23/1991 | WO1991018188A1 Rotary machine |
| 11/23/1991 | CA2083517A1 Rotary machine |
| 11/21/1991 | EP0457365A2 Apparatus for controlling hydraulic pump |
| 11/19/1991 | US5066199 Method for injecting treatment chemicals using a constant flow positive displacement pumping apparatus |
| 11/17/1991 | CA2042760A1 Wobble plate type compressor with variable displacement mechanism |
| 11/12/1991 | US5064352 Slant plate type compressor with variable dispalcement mechanism |
| 11/12/1991 | US5064351 Variable displacement pumps |
| 10/31/1991 | WO1991016540A1 Synchronization mechanism |
| 10/29/1991 | US5061155 Rotary swash plate type axial plunger pump |
| 10/22/1991 | US5059096 Fuel pumping apparatus |
| 10/22/1991 | US5058485 Ring valve pump |
| 10/17/1991 | DE4011737A1 Adjustable axial piston swash plate machine - has provision of pressure relief recesses in swash plate disc |
| 10/15/1991 | CA1290799C Power transmission |
| 10/09/1991 | EP0450623A1 Swash plate type axial piston pump |
| 10/09/1991 | EP0450586A1 Rotary type fluid energy converter |
| 10/02/1991 | EP0449692A1 Modular pump with plural outlets, each supplied by a pump unit |
| 10/02/1991 | EP0448836A1 Piston pump |
| 10/02/1991 | CN1055041A Wobble plate type refrigerant compressor having ball-and-socket joint lubricating mechanism |
| 10/01/1991 | US5052898 Bent axis compressor |
| 10/01/1991 | US5052896 Regulating valve for a hydraulically adjustable control pump |
| 09/26/1991 | DE4109072A1 Check valve for radial piston pump - uses spring tongue in circumferential groove in valve housing |
| 09/24/1991 | US5051074 Bi-directional reciprocating pump mechanism |
| 09/24/1991 | CA1289413C Dual range pressure compensated rotary pump valve plate |
| 09/19/1991 | DE4107952A1 Radial piston pump assembly - is activated by eccentric on rotatable shaft with support body between eccentric and piston |
| 09/19/1991 | DE4107721A1 Radial piston pump assembly - has pistons moved inwards by springs and pressed outwards by driven eccentric |
| 09/19/1991 | DE4017062C1 Radial piston hydraulic machine - incorporates push-rods connecting pistons to chain rollers |
| 09/18/1991 | CN2084990U Serial structure of two co-operating cylinders |
| 09/17/1991 | US5048561 Bidirectional check valve |
| 09/11/1991 | EP0445702A1 Variable displacement bent axis type hydraulic machine |
| 09/10/1991 | US5046931 Radial gear driven piston pump |
| 09/10/1991 | US5046403 Axial piston machine with swash plate construction |
| 09/03/1991 | US5044898 Fuel injection pump |
| 08/28/1991 | EP0443816A2 Expander band for hydrostatic transmission |
| 08/28/1991 | EP0443561A1 Device to adjust the capacity of a hydrostatic machine |
| 08/22/1991 | DE4004932A1 Radial fluid pressure motor - has cam and roller operated pistons with piston ring at piston base carrying turning moment |
| 08/20/1991 | US5040451 Radial piston pump or motor having pressure zones on the control tap for balancing the pump body |
| 08/14/1991 | DE4104284A1 Radial piston engine - has shaft on output side mounted in sleeve fitted in casing and retained by cover which also houses seal |
| 08/14/1991 | DE4103986A1 Double pump with radial piston and sliding vanes - provides small amount of axial play for cylinder ring |
| 08/14/1991 | DE4004142A1 IC-piston engine - has adjustable displaced volume with drive shaft encompassed by eccentric wheels rotatable in relation to drive shaft |
| 08/13/1991 | US5039283 Device for anti-skid brake system |
| 08/13/1991 | US5039282 Slant plate type compressor with variable displacement mechanism |
| 08/13/1991 | US5038673 High-pressure cleaning apparatus with a wobble plate piston pump |
| 07/30/1991 | US5035170 Direct drive variable displacement hydraulic apparatus |
| 07/25/1991 | DE4002017A1 Swashplate-type axial piston machine - has double-armed adjusting lever to external adjusting mechanisms |
| 07/25/1991 | DE4001751A1 Rotary plunger pump for gas or liq. - has plungers in radial bores in annular rotor with eccentric control body inside |
| 07/23/1991 | US5033359 Rotor ports, control body recesses and a control pintle in fluid machines |
| 07/17/1991 | EP0436593A1 Axial piston hydrostatic machine with variable displacement. |
| 07/17/1991 | CN1053109A Vertical reciprocating pump |
| 07/16/1991 | US5032065 Radial piston pump |
| 07/10/1991 | EP0325584B1 A fluid motor |
| 07/04/1991 | DE4000016A1 Stepless controllable piston vacuum pump - involves eccentrically mounted worm drive mechanism |
| 07/03/1991 | CN1013047B Power transmission |
| 06/27/1991 | WO1991009228A1 High-pressure swash-plate pump |
| 06/26/1991 | EP0433730A1 Axial piston machine with swash plate |
| 06/25/1991 | CA1285194C Pressure flow compensating control circuit |
| 06/19/1991 | EP0432934A1 Variable displacement high pressure pump with internal power limiting arrangement |
| 06/19/1991 | CN2079226U Ultrahigh-pressure valve type flow distribution axial plunger pump |
| 06/18/1991 | US5024143 Swashplate type hydraulic axial piston machine having a tracking device for the cage of the segmental rolling contact bearing of the swashplate |
| 06/13/1991 | DE3940441A1 Axial piston swashplate engine - has hydrostatic drive mechanism for keeping piston slipper in contact with swashplate |
| 06/12/1991 | EP0432037A1 Multi-cylinder radial pump |
| 06/12/1991 | CN1052172A Hydraulic motor with constant-stress rolling track and radial spherical pistons |
| 06/05/1991 | EP0430099A1 Radial pistons pump, in particular for hydraulic system and pressurizing element therefor |
| 05/31/1991 | CA2030318A1 Variable displacement high pressure pump with internal power limiting arrangement |
| 05/30/1991 | WO1991007590A1 Swash plate piston pump/motor |
| 05/28/1991 | US5018433 Mechanism employing fluid under pressure provided with a rotor, a stator and a device for assembling these two elements |
| 05/22/1991 | EP0428374A1 Positive displacement pump systems |