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| Number | Title | Issue Date |
| 8186979 | Capacity varying type rotary compressor and refrigeration system having the same A capacity varying type rotary compressor and a refrigeration system having the same are provided. The capacity varying type rotary compressor includes a casing that contains a certain amount of oil and maintains a discharge pressure state; a motor installed in the ... | 05/29/2012 |
| 8118575 | Variable displacement vane pump with enhanced discharge port A variable displacement vane pump which includes an enhanced discharge port. The enhanced discharge port reduces areas of high pressure in the discharge port which would otherwise occur as the pressurized working fluid reverses its direction of flow to enter the dis... | 02/21/2012 |
| 8057201 | Variable displacement vane pump with dual control chambers A variable capacity vane pump has a pump control ring which is moveable to alter the volumetric displacement of the pump. The pump ring is moved by at least first and second control chambers, which acts on the pump control ring when pressurized working fluid is supp... | 11/15/2011 |
| 8047822 | Continuously variable displacement vane pump and system A vane pump (20) is provided which has an output pressure hat can be selected from a continuous range of pressures, independent of the operating speed of the pump. The pump has first (68) and second (72) control chambers which create opposed for... | 11/01/2011 |
| 8038420 | Variable displacement vane pump A variable displacement vane pump that assuredly suppresses seizing of mutually contacting surfaces of a pressure plate and a rotor where the pressure plate is formed, at one side surface thereof that slidably contacts the rotor, with an annular lubricating groove. ... | 10/18/2011 |
| 8011908 | Variable capacity pump with dual springs A variable capacity vane pump has a pump control ring that is moveable to alter the capacity of the pump. A control chamber is formed between the pump casing and the control ring. The control chamber is operable to receive pressurized fluid to create a force to move... | 09/06/2011 |
| 7997882 | Reduced rotor assembly diameter vane pump A vane pump with a reduced rotor diameter is provided. The reduced rotor diameter allows a reduction in the overall size of the pump which allows the pump to be used in circumstances wherein sufficient packaging volume does not exist for conventional vane pumps. Fur... | 08/16/2011 |
| 7993116 | Variable displacement vane pump A variable displacement vane pump includes a rotor, a cam ring; and a pump casing including first and second side walls disposed on both sides of the cam ring, and a circumferential wall surrounding the cam ring and defining first and second pressure chambers. A pre... | 08/09/2011 |
| 7866963 | Variable delivery vane oil pump, in particular for oil A variable delivery vane pump, in particular for oil, is provided with a stator (10) eccentrically mounted about a rotor (9), which is adapted to turn about one own longitudinal axis (6), and presents a plurality of grooves (15) radially ... | 01/11/2011 |
| 7857606 | Variable displacement pump A variable displacement pump includes a pump body defining first and second pools for introducing fuel/lubricant oil, and internal and external rotary members rotatably mounted on the pump body and cooperatively defining a space such that, during counterclockwise re... | 12/28/2010 |
| 7798790 | Vane pump using line pressure to directly regulate displacement A variable displacement vane pump includes at least two regulation chambers to provide a regulating force to the cam ring to counter the force applied to the cam ring by a regulating spring and reduce pulsation in the output working fluid from the pump. A first regu... | 09/21/2010 |
| 7798791 | Capacity varying type rotary compressor and refrigeration system having the same A capacity varying type rotary compressor and a refrigeration system having the same are provided. The capacity varying type rotary compressor includes a casing that contains a certain amount of oil and maintains a discharge pressure state; a motor installed in the ... | 09/21/2010 |
| 7794217 | Variable capacity vane pump with dual control chambers A variable capacity vane pump includes a pump casing having a pump chamber with an inlet and an outlet port. A pump control ring is moveable within the pump chamber to alter the capacity of the pump. A vane pump rotor is rotatably mounted within the pump control rin... | 09/14/2010 |
| 7785087 | Vane cell pump having pistons guided in cylinder for adjustment of the stator The present disclosure relates to a vane cell pump (12) which includes an internal rotor (16) and a plurality of vanes (20) which are displacably mounted in a radial manner in the internal rotor, essentially, in radial slots (18) and are ... | 08/31/2010 |
| 7736134 | Vane machine, in particular vane pump A vane machine comprises an inner rotor (28) and an outer rotor (51). A plurality of radially extending vane elements (32) separates first vane chambers (89) from one another. The van elements (32), with a radially inner end region... | 06/15/2010 |
| 7614858 | Variable capacity vane pump with force reducing chamber on displacement ring A novel variable displacement vane pump is provided wherein pressurized working fluid is provided to a portion of the pump chamber to act on the outside of the capacity varying ring to substantially balance the force created by the high pressure working fluid inside... | 11/10/2009 |
| 7540727 | Capacity varying type rotary compressor A capacity varying rotary compressor is provided. The compressor includes a cylinder mounted in a casing, and a vane pressure chamber provided at a rear side of a vane that divides an inner space of the cylinder into a suction chamber and a compression chamber. A pr... | 06/02/2009 |
| 7354250 | Variable capacity rotary compressor A variable capacity rotary compressor having a slot defined between eccentric bushes, a latch pin fitted to a rotary shaft so as to be latched to the slot, and a restraint unit for restraining the eccentric bushes upon rotation of the rotary shaft. The restraint uni... | 04/08/2008 |
| 7318705 | Variable displacement pump with communication passage A variable displacement pump includes a rear cover and side plate arranged on both sides of a cam ring and making slide contact with the cam ring. The rear cover has an end face on the side of the cam ring, which is formed with a suction port. A seal member is arran... | 01/15/2008 |
| 7281914 | Variable capacity rotary compressor A variable capacity rotary compressor has a simplified structure to reduce manufacturing costs and assembling time thereof and is capable of easily and conveniently performing a capacity-changing operation. The variable capacity rotary compressor includes first and ... | 10/16/2007 |
| 7207783 | Variable displacement pump Within a cam ring (8), a rotor having a plurality of vanes (27) is eccentrically disposed. A metering orifice (136) is provided halfway on a discharge passage (135) of pressure fluid discharged from the pump, and a control valve is activa... | 04/24/2007 |
| 7192259 | Variable capacity rotary compressor A variable capacity rotary compressor with upper and lower compression chambers having different capacities, the upper and lower compression chambers being partitioned from each other, and a rotary shaft extending through the upper and lower compression chambers. Th... | 03/20/2007 |
| 7165955 | Trochoid type oil pump It is an object of the present invention to provide a trochoid type oil pump in which erosion of the rotor surfaces caused by cavitation is minimized, vibration and noise are reduced, and the structure is greatly simplified. The trochoid type oil pump of the present... | 01/23/2007 |
| 7128542 | Variable displacement pump In a hydraulic pump, a cam ring is provided in a cylindrical adaptor for movement in a radial direction, and a differential pressure control valve is provided to control internal pressure and load pressure at the front and back sides of a variable orifice to be intr... | 10/31/2006 |
| 7114931 | Rotary pump A rotary pump includes a stator housing and a rotor. The stator housing preferably has an oblong inner surface. The rotor, which is disposed in the stator housing, preferably has a substantially circular outer surface within which a plurality of vane slots are defin... | 10/03/2006 |
| 7083394 | Vane pump with undervane feed A vane pump is disclosed for use with gas turbine engines which has pressurized fluid supplied to the undervane portion of the vane elements to balance the forces imparted thereon. The vane pump includes a pump housing, a cam member, a cylindrical rotor member and a... | 08/01/2006 |
| 7070399 | Variable displacement pump with a suction area groove for pushing out rotor vanes A variable displacement pump has a cam ring, a rotor, a plurality of vanes, a pressure plate and a rear body. The cam ring is accommodated within a pump body. The rotor rotates within the cam ring. The plurality of vanes are inserted retractably into slits formed at... | 07/04/2006 |
| 6913446 | Method for improving the efficiency of a variable displacement pump An auxiliary solenoid controlled variable displacement power steering pump, hydraulic systems incorporating same, and method for improving the efficiency of variable displacement power steering pumps. In one embodiment, a rotor is arranged within a pump body, and a ... | 07/05/2005 |
| 6763797 | Engine oil system with variable displacement pump A lubrication system for an internal combustion engine includes a variable displacement oil pump supported on the engine block and connected to draw oil from the oil pan and to supply pressurized oil to various engine components. The pump defines variable displaceme... | 07/20/2004 |
| 6716007 | Variable capacity rotary compressor A variable capacity rotary compressor includes a housing having a cylindrical compressing chamber defined therein, a rotating shaft having an eccentric body part which rotates in the compressing chamber, a ring piston fitted over the eccentric body part of the rotat... | 04/06/2004 |
| 6688862 | Constant flow vane pump A variable capacity pump includes a housing and a rotatable rotor within the housing. The rotor includes radial slots to accommodate slidable vanes or rotor blades, wherein the vanes are urged outwards by centrifugal force into contact with the inner surf... | 02/10/2004 |
| 6616419 | Variable displacement pump In a variable displacement pump, a pressurizing cylinder is provided in an opposite side of the first fluid pressure chamber, holding the cam ring there between, and a piston inserted to the pressurizing cylinder collides with the cam ring. A pressure in ... | 09/09/2003 |
| 6457946 | Regulatable pump A regulatable pump, in particular a vane pump, is provided with a rotor, with a rotor body and with at least one guide ring and with a cam ring. The eccentricity of the cam ring can be adjusted by means of a regulating piston, a journal of the cam ring ly... | 10/01/2002 |
| 6402487 | Control system for variable exhaust nozzle on gas turbine engines The present invention relates to a system that provides independently operated or controlled circuits in a single device. An exemplary application adapts a variable displacement roller pump into an engine geometry control system that uses one circuit of t... | 06/11/2002 |
| 6217296 | Variable displacement pump A variable displacement pump includes pump bodies, a cam ring, first and second fluid pressure chambers, a rotor, a driving shaft, a pump chamber, a compression coil spring, a metering restrictor portion, and a control valve. A plunger damper is formed to... | 04/17/2001 |
| 5895209 | Variable capacity pump having a variable metering orifice for biasing pressure A variable capacity pump includes a rotor, a plurality of vanes, a cam ring, a spring, a variable orifice, first and second fluid pressure chambers, and first and second openings. The spring biases the cam ring to a position where a volume of the pump cha... | 04/20/1999 |
| 5752815 | Controllable vane pump In a controllable vane pump for pumping lubricant through a lubricant circulating system of an internal combustion engine wherein a pivotally supported control ring surrounds the vanes which rotate with the pump rotor and engage the inner walls of the con... | 05/19/1998 |
| 5690479 | Multi-stage regulator for variable displacement pumps Multi-stage regulator for lubricant pumps with continuously adjustable displaced volumes in particular for lubricant pumps, with a regulating piston to which pressure can be applied from pressure derived from the output side of the pump, and with increasi... | 11/25/1997 |
| 5674059 | Reciprocating variable displacement rotary vane machine An first rotor and an second rotor rotate about a longitudinal axis in a housing. The second rotor moves longitudinally relative to the first rotor. Rotor vanes extend outward from the rotors and are longitudinally split into longitudinally extending seco... | 10/07/1997 |
| 5562432 | Variable displacement pump having throttled control passages To restrain the swinging of a movable displaceable cam ring and a spool of a control valve and to suppress pulsation on the discharge side of a variable displacement pump. In the variable displacement pump, a variable metering orifice (40) is provided mid... | 10/08/1996 |
