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| Number | Title | Issue Date |
| 7410349 | High efficiency gerotor pump A pump assembly includes a pump housing, a stator ring supported within the pump housing, and a pump ring also rotatably supported within the pump housing. The pump ring interfaces with the stator ring to define a plurality of variable volume pressure chambers. A co... | 08/12/2008 |
| 7207786 | Fuel pump with filter-absent safety valve and universal inlet and outlet Fuel pump assembly 10 includes a filter 42 that rests on ledge 48, between the pump housing 22 and inlet cap 56. Filter detector 50 has a valve engager 62 for opening the check valve 58 and bearing feet 52 | 04/24/2007 |
| 6929064 | Downhole pump There is disclosed an improved pump (5, 5′) particularly suitable for use in a method of “artificial lift” in an oil/gas well. Known pumps used in artificial lift methods suffer from a number of problems/disadvantages—e.g. low efficiency (hydraulic ef... | 08/16/2005 |
| 6749272 | Rotary pump with higher discharge pressure and brake apparatus having same In a rotary pump in which axial end surfaces of outer and inner rotors is in pressurized direct contact with an axial end surface of a second side plate to form a mechanical sealing, both of the axial end surfaces of the outer and inner rotors and the axial end surf... | 06/15/2004 |
| 6749411 | Rotary vane hydraulic power device A rotary vane device for hydraulic transmission of mechanical energy with industrial scale measures of power and rotational velocity. The device offers high measures of both volumetric efficiency and rotational velocity and hence substantial measures of functional e... | 06/15/2004 |
| 6688866 | Gerotor pump with variable tolerance housing A gerotor pump is provided that includes a pump housing having a pump cover and a pump end plate. The pump cover defines an open end, an axial bore, and a bottom end. The pump end plate engages the open end of the pump cover thereby enclosing the axial bo... | 02/10/2004 |
| 6655936 | Rotary vane pump with under-vane pump A vane pump including a rotating group comprising a thrust plate and a pressure plate which cooperate with a cam ring, rotor and vanes to provide a plurality of pump chambers. The thrust plate includes a pair of thrust plate passageways. Each thrust plate... | 12/02/2003 |
| 6641380 | Vane pump having a pressure plate and a shaft seal A pump is proposed, in particular a vane pump, for a liquid or gaseous medium, which can be driven with the help of a motor, in particular an electric motor, and which comprises a rotor (15) that can be coupled to a drive shaft (29) of the motor and is ar... | 11/04/2003 |
| 6599111 | Vane pump having an intake groove through a side wall member A vane pump comprising a pump housing, including an inlet, an outlet, and therein a hollow space, a cam ring received in the hollow space, a rotor placed in the cam ring and defining a rotation axis. The rotor comprises plural vanes arranged in correspond... | 07/29/2003 |
| 6599113 | Independent vane rotary gas compressor A radial vane type machine intended for production of compressed gaseous and vaporous fluids with industrial scale measures of compression amplification and throughput. Fluid compression is accomplished by mechanical volume manipulation but without the us... | 07/29/2003 |
| 6527529 | Geared feed pump having a platelike cover element and an indented end cap The geared feed pump has a housing, in which a pump chamber is formed between a housing part and a cap part, and a pair of gear wheels, driven to rotate and meshing with one another on their outer circumference, are disposed in the pump chamber and pump a... | 03/04/2003 |
| 6123526 | Multistage pump and method for assembling the pump A multistage pump includes a shaft assembly and a housing and spacing plates. The shaft assembly completed by forming shafts and rotors integrally. The spacing plates defining a plurality of successive compression chambers, each chamber is delimited by tw... | 09/26/2000 |
| 6113370 | Rotary vane machine The invention provides a rotary-vane machine having a stationary shell including a casing member (2), a camming ring (4) having an internal, noncircular camming surface (6), and a flange member (8); a rotor (10) including at least two first vanes (12) fix... | 09/05/2000 |
| 6086345 | Two-piece balance plate for gerotor motor A gerotor motor of the type having an end cap (13), and a stationary valve plate (15) disposed adjacent a rearward surface of the gerotor gear set (17). Adjacent a forward surface of the gerotor star (27) is a balancing plate assembly (19) including a rad... | 07/11/2000 |
| 6024549 | Vane type rotary device A rotational mechanism which consists of a circular armature fitted with a plurality of radial vanes which rotates within a stationary, cylindrical, containment structure with a circular bore. The rotational armature is concentrically installed on a rotat... | 02/15/2000 |
| 5862664 | Charging pump for a hydrostatic transmission A hydrostatic transmission and a charge pump for supplying operating oil which are housed in a housing, in which a pump casing of the charge pump is mounted to a center section of the hydrostatic transmission without using mounting bolts. A spring is inte... | 01/26/1999 |
| 5807090 | Vane pump having a hydraulic resistance element A pump, particularly a vane or roller pump, with at least two pump segments, each having a suction region and a pressure region, with a first fluid path leading from the pressure side to a consumer, and with at least one hydraulic resistance element, whic... | 09/15/1998 |
| 5676532 | Adjustable one-way rotary liquid pumping device An adjustable one-way rotary liquid pumping device including a housing, a cover fixedly engaged with the housing, a first bearing a first bearing fitted in the housing, a second bearing fitted in the cover, an axle extending through the housing and the co... | 10/14/1997 |
| 5417556 | Bearing for gear pump A floating bearing having an oval body located in a cavity along with a fixed bearing retains a pair of intermeshing gear members in the cavity in a housing of a pump. A spacer member engages an axial rib on the oval body to form a control chamber between... | 05/23/1995 |
| 5403173 | Housing for intermeshing gear pump A housing for a pump having a cavity therein formed by first and second side walls connected to first and second semicircular end walls. A pair of intermeshing gear members are journaled in a floating bearing and a fixed bearing are located in the cavity.... | 04/04/1995 |
| 5395217 | Gear pump for oil for an internal-combustion engine, in particular for motor vehicles The invention relates to a gear pump for oil for an internal-combustion engine, in particular for motor vehicles, comprising a pump housing mounted on the motor and an outer rotor which is arranged in the pump housing, an inner rotor additionally being ar... | 03/07/1995 |
| 5385457 | Nutating positive displacement device having a magnetic element wire sensing arm A positive displacement device is presented. The mechanism comprises a nutator capable of nutating within a nutating chamber defined by the interior surface of the body of the positive displacement device between an inlet into and an outlet out of the pos... | 01/31/1995 |
| 5290155 | Power steering pump with balanced porting The balanced vane hydraulic pump designed for automotive power steering applications employs a two-piece aluminum housing construction, a cam ring, rotor flow regulating valve, a high pressure gallery, and a pressure plate, all located in the rear housing... | 03/01/1994 |
| 5244367 | Gear pump with a resilient means for biasing a side wear plate A gear pump for use in a metered liquid dispensing system utilizes a pair of carbon graphite wear plates to increase pump vacuum or suction lift capabilities. The wear plates are disposed on opposite sides of the pump spur gears and are biased against the... | 09/14/1993 |
| 5228594 | Metered liquid dispensing system A liquid dispensing system utilizes a microprocessor based electronic control and a positive displacement gear pump to accurately meter predetermined batches of liquid pumped from a supply tank. The gear pump is driven by a reversible motor through a gear... | 07/20/1993 |
| 5076770 | Gear pump having improved low temperature operation A gear pump having improved low-temperature operation includes a housing with a cavity wherein is rotatably received a pair of meshed pinion gears. A pair of bushing members matched in external shape to a projection of the pair of gears and complementary ... | 12/31/1991 |
| 4940394 | Adjustable wearplates rotary pump A rotary lobed rotor pump has externally adjustable wearplates in the rotor casing juxtaposed to the parallel ends of rotating lobed rotors. Resilient members such as Belleville springs are adjusted by compression by means external of the rotor casing so ... | 07/10/1990 |
| 4820139 | Self-contained rotary fuel pump An electric fuel pump which is self-contained in a unitary housing with a fuel inlet at one end leading to a rotary eccentric pump, the pumped fuel passing out an outlet at the other end of the housing. A relief valve in the form of a shaped plate at the ... | 04/11/1989 |
| 4772190 | Vane cell pump having resilient sealing means biasing the pressure plate A vane cell pump comprises a housing having a small bore at one end extending to a large bore at the other end. A drive shaft for a pump package, i.e., a rotor, vanes and cam ring in said large bore. The other end of the housing is closed by a pressure pl... | 09/20/1988 |
| 4697995 | Rotary positive displacement fuel pump with purge port A rotary pump for volatile hydrocarbon fuels for use in a fuel system of an internal combustion engine in which a rotor combination has circumferentially spaced areas with ensmalling and enlarging pumping chambers such as a vane pump or a gear rotor pump.... | 10/06/1987 |
| 4596519 | Gear rotor fuel pump A rotary pump for pumping liquid which includes a rotor combination in the form of a vane pump or gear and rotor with pumping chambers disposed circumferentially around the rotor. The chambers progressively increase in the inlet area and ensmall in the ou... | 06/24/1986 |
| 4540354 | Rotary fuel pump A rotary pump for pumping liquid which includes a rotor combination in the form of a vane pump or gear and rotor with pumping chambers disposed circumferentially around the rotor. The chambers progressively increase in the inlet area and ensmall in the ou... | 09/10/1985 |
| 4540347 | Gerotor pump A gerotor pump of n and n+1 type has the annulus and rotor located in a chamber with one wall provided by a floating coverplate held in place by a spring so that in the event of excess internal pressure the cover can lift to allow cross leakage between th... | 09/10/1985 |
| 4526518 | Fuel pump with magnetic drive An axial air gap magnetic drive motor having a diaphragm to seal the drive motor from the pump is disclosed. The drive motor drives a positive displacement pump through a magnetic coupling on both sides of the diaphragm. The gerotor pump includes an annul... | 07/02/1985 |
| 4518331 | Pressure loaded gear pump A pressure loaded gear pump comprising a housing, a pair of intermeshing gears positioned in the housing, at least one gear side face sealing member, and pressure loading means for defining a pressure loaded area in use of the pump, the pressure loading m... | 05/21/1985 |
| 4505655 | Vane pump with positioning pins for cam ring and side plates A vane pump for use in a power steering device comprising a pump housing receiving a cam ring therein. A pair of side plates are disposed at opposite side of the cam ring in contact relationship therewith. A pump rotor rotatable integrally with a drive sh... | 03/19/1985 |
| 4500268 | Rotary pump having brake means with thermal fuse A backup fuel pump (16) has a thermal fuse (40) positioned in a bearing. The fuse is adapted to melt at a predetermined temperature during dry running of the pump. Melting of the fuse causes a spring urged braking member (42) to screw into a shaft journal... | 02/19/1985 |
| 4500270 | Gear rotor fuel pump A positive displacement fuel pump utilizing an in-line pump and armature with a flexible drive connection and spring-pressed backing plate for the pump and short cantilever mount shaft for the pump rotor.... | 02/19/1985 |
| 4484863 | Rotary vane pump with undervane pumping and an auxiliary outlet A rotary vane pump having a rotatable rotor in an elliptical chamber and a plurality of radially slidable vanes dispersed around the rotor, and having an intake phase and a discharge phase of rotor rotation, wherein liquid is admitted into the pump, press... | 11/27/1984 |
| 4447192 | Self-contained rotary fuel pump An electric fuel pump which is self-contained in a unitary housing with a fuel inlet at one end leading to a rotary eccentric pump, the pumped fuel passing out an outlet at the other end of the housing. A relief valve in the form of a shaped plate at the ... | 05/08/1984 |
