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| Number | Title | Issue Date |
| 7563087 | Pump rotor seal apparatus and method An improved pump and pumping method includes a circumferential positive displacement pump having two counter rotating rotors. A clearance gap is defined between the rotor shaft, and a body hub portion of the body that forms the chamber. ... | 07/21/2009 |
| 7354188 | Gear pump having input and output screw shafts with a decreasing flight depth toward a gear section in transfer mix areas The invention relates to a gear pump which is suitable for delivering highly viscous materials. The aim of the invention is to provide a gear pump having a low-wear and low-maintenance bearing system, high output and good self-cleaning properties. For this purpose, ... | 04/08/2008 |
| 7278840 | Compliant viscous seal for fluid transfer device A viscous seal for fluid transfer devices that deviates from the conventional wisdom of avoiding contact between the seal and a rotating drive shaft of the fluid transfer device. Instead of avoiding contact, contact between the seal and drive shaft is used to effect... | 10/09/2007 |
| 7273360 | Vane-type hydraulic motor A vane-type hydraulic motor includes a rotor (30) having a main shaft (70) and a plurality of vanes (35), a cam casing (10) having a chamber (11) for rotatably housing the rotor (30), a first port (13) and a second po... | 09/25/2007 |
| 7247005 | Oil seal arrangement A motor-driven gear pump assembly includes a rotary shaft rotatably mounted in a housing, and a pump mounted on the rotary shaft. The pump has a pressure chamber. A high-pressure seal is disposed around the shaft between the pump and the motor. A low-pressure seal i... | 07/24/2007 |
| 7172039 | Down-hole vane motor The present invention generally relates to an apparatus and method for use in a wellbore. In one aspect, a downhole tool for use in a wellbore is provided. The downhole tool includes a housing having a shaped inner bore, a first end and a second end. The downhole to... | 02/06/2007 |
| 7137793 | Magnetically driven gear pump A magnetically driven gear pump having a housing, a rotatable annular magnetic drive assembly magnetically coupled to but spaced from an annular driven magnet and rotor gear assembly with an annular canister disposed therebetween, and wherein when the annular magnet... | 11/21/2006 |
| 7097437 | Rotary fluid machine A rotary fluid machine is provided that includes a rotor chamber (14), a rotor (41), vanes (48) guided by vane channels formed in the rotor (41), and pistons (47) slidably fitted in cylinders (44) provided in the rotor (4... | 08/29/2006 |
| 7018186 | Feed pump The invention relates to a feed pump for delivering fluid media, wherein the pump bearings are lubricated by the feed medium itself. Connecting channels with valve devices are provided on the suction side and on the pressure side upstream and downstream, respectivel... | 03/28/2006 |
| 6969242 | Compressor To counter downstream oil infiltration through a shaft seal, a small portion of the compressed fluid is diverted from downstream to upstream through a passageway in a rotor. The diverted fluid is introduced to a space at a downstream side of the seal. An exemplary i... | 11/29/2005 |
| 6945763 | Geared pump with forced lubricated coupling A geared feed pump has a housing having a pump chamber in which a rotationally driven pair of gear wheels meshing with one another is disposed for pumping medium out of a suction chamber that communicates with a supply tank, along feed conduits, formed between the c... | 09/20/2005 |
| 6905321 | Rotary pump for braking apparatus In a rotary pump for a braking apparatus, a discharge trench is formed on an axial direction end surface of a second side plate that forms a mechanical seal. As a result, rotors are pressed back toward a side of a first side plate by a discharge pressure of brake fl... | 06/14/2005 |
| 6835056 | Roller vane pump incorporating a bearing bush Roller vane pump, in particular suited for pumping fluid in a continuously variable automatic transmission of a motor vehicle, provided with a pump housing accommodating a substantially cylindrical carrier, which is rotatable about a central axis, and a cam ring enc... | 12/28/2004 |
| 6824368 | Pump for conveying molten masses of polymers and elastomers A pump for conveying molten masses of polymers and/or elastomers comprising a pump body in which are formed an inlet duct for entry of the material, an outlet duct for discharge of the material and a central body communicating with the inlet and outlet ducts and des... | 11/30/2004 |
| 6802702 | Feed pump for fluidic media having sleeve bearing lubrication The invention relates to a feed pump for fluidic media, comprising a displacement body that is mounted in a pump housing and equipped with slide bearings and connecting channels that connect the slide bearings to the produce channel on the suction side for recircula... | 10/12/2004 |
| 6761546 | Gear pump having bearings with cooling ducts A gear pump comprises a casing and gear rotors disposed therein. The gear rotors are lodged in bearing sections of plain bearings that are lubricated by the pumping medium. They have at least one cooling duct which is embodied such that cooling varies along the circ... | 07/13/2004 |
| 6729117 | Spindle assembly for rotary mower A spindle assembly for a rotary mower comprises a spindle that is drivingly connected between an output shaft of a hydraulic motor or other rotary power source and a horizontal blade assembly, and a spindle housing that rotatably supports the spindle for rotation an... | 05/04/2004 |
| 6716011 | Hydraulic pump utilizing floating shafts A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump elements dis... | 04/06/2004 |
| 6692244 | Hydraulic pump utilizing floating shafts A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump e... | 02/17/2004 |
| 6685453 | Fluid transfer machine with drive shaft lubrication and cooling A fluid transfer machine includes a positive displacement, rotary-type pumping mechanism driven by a drive shaft. The drive shaft is lubricated and cooled by locating the drive shaft in a primary flow path in the machine. Fluid is directed from the inlet ... | 02/03/2004 |
| 6629829 | Vane type rotary machine The present invention relates to a vane rotary machine such as a vane pump or a vane motor. The vane rotary machine has a rotor (15) supporting vanes (60) thereon and housed in a cam casing (10), and a main shaft (40) attached to the rotor (15) and rotata... | 10/07/2003 |
| 6514059 | Scroll compressor An object of the present invention is to provide a scroll compressor that improves assembly precision and the engagement projections are not easily damaged even when a strong force is applied to the Oldham ring during operation; in order to attain this ob... | 02/04/2003 |
| 6457950 | Sealless multiphase screw-pump-and-motor package A pump is disclosed, including a motor and a pump housing, for pumping mixed gas and liquid. The pump includes two intermeshed screw members for providing progressive cavities for transporting mixed fluids, within a pumping cavity, from a suction passage ... | 10/01/2002 |
| 6315537 | Spin pump having a cooling sleeve surrounding the drive shaft The invention relates to a spin pump for conveying a liquid polymer melt. To drive the conveying means enclosed in the pump housing, a drive shaft is provided, which extends through the pump housing in a bearing bore, and which comprises an external end f... | 11/13/2001 |
| 6264447 | Air-cooled shaft seal An air-cooled shaft seal comprises an annular body having an inner surface and an outer surface. One or more helical channels are formed on the inner surface. A plurality of external surfaces such as radial fins are disposed in axially spaced relationship... | 07/24/2001 |
| 6213745 | High-pressure, self-lubricating journal bearings A journal bearing comprises a body having a central longitudinal axis, a cylindrical inner surface coaxially disposed around the longitudinal axis and defining an axial bore, and an outer surface including a peripheral planar section. A lateral face is di... | 04/10/2001 |
| 6179594 | Air-cooled shaft seal An air-cooled shaft seal comprises an annular body having an inner surface and an outer surface. One or more helical channels are formed on the inner surface. A plurality of external surfaces such as radial fins are disposed in axially spaced relationship... | 01/30/2001 |
| 6158994 | Grooved rotor for an internal gear pump A rotor for an internal gear pump adapted to improve the lubrication of the internal gear parts. A radial groove is added to the inner face of an internal rotor. The groove extends radially between the center of the rotor and an outer diameter of the roto... | 12/12/2000 |
| 6149414 | Oil-sealed vane-type rotary vacuum pump with an oil pump The invention concerns an oil-sealed vane-type rotary vacuum pump (1) with a rotor (3) and an oil pump (45, 46) whose suction chamber is fitted with feeds (64, 65) for gas and oil. In order to simplify the supply of a gas/oil mixture to the vacuum pump, t... | 11/21/2000 |
| 6135742 | Eccentric-type vane pump The present invention relates to an eccentric-type vane pump and, in particular, to an eccentric-type vane pump being capable of generating minimum heat and noise due to frictional force produced from rotation of the vane pump. The vane pump comprises a r... | 10/24/2000 |
| 6135741 | Recirculating flow path for gear pump A gear pump includes a pump body having a pair of cylindrical gear chambers, and high pressure and low-pressure fluid ports into the chambers. A pair of cover plates enclose the open ends of the pump body. A drive gear on a drive shaft and a driven gear o... | 10/24/2000 |
| 6134911 | Compressor for use in refrigerator A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant p... | 10/24/2000 |
| 6129533 | Sealing system for rotating component of a pump The invention relates to a fluid-conveying machine, in particular, a pump having a component rotating in a stationary housing part inside an annular gap. The stationary housing part separates an interior having a higher product pressure from an exterior h... | 10/10/2000 |
| 6123531 | Bearing arrangement for a pump shaft of a pump for delivering media of different viscosities A gear pump has a housing, a pump shaft supported in a housing wall by a bearing, and a pumping gear supported on the pump shaft which is operable to pump newtonian and non-newtonian liquid of different densities. A relief collection zone is arranged on a... | 09/26/2000 |
| 6113371 | Scroll-type machine with compact Oldham coupling A scroll compressor has a fixed scroll and an orbiting scroll nested with one another within a shell. The orbiting scroll has a base plate with a pair of opposed slots formed therein, and a spiral wrap extending axially from the base plate. The fixed scro... | 09/05/2000 |
| 6109900 | Hydraulic pump A hydraulic pump unit is encased between a pump body and a pump cover. A bearing hole passes through the pump body and is formed in the pump body. A drive shaft and a bearing bush are inserted into the bearing hole. The drive shaft drives the hydraulic pu... | 08/29/2000 |
| 6109901 | Vane-type rotary compressor having a bypass passage defined in a front cover A vane-type rotary compressor has a compression chamber delimited by a cylinder and front and rear covers secured to opposite ends of the cylinder. The front cover accommodates main and auxiliary shaft seal parts held in contact with a drive shaft. A spac... | 08/29/2000 |
| 6086344 | Hydraulic motor lubrication path A lubrication path in a gerotor motor extending in the face of the rotor or an adjoining surface from a gerotor cell having relatively high pressure to the central cavity of the device to provide cooling and lubrication fluid thereto.... | 07/11/2000 |
| 6071105 | Gear pump for feeding fuel to a fuel injection pump A feed pump having a pair of gears in a housing that mesh with each other and are driven to rotate in a pump chamber. The pair of gears supply fuel from an intake chamber connected to a storage tank, along a supply conduit in the housing constituted betwe... | 06/06/2000 |
| 6048185 | Hydraulic pumps A hydraulic pump includes a pump body having a bearing hole and formed with a seal chamber at an end of the bearing hole and an oil groove therein, the oil groove ensuring hydraulic communication between the pump unit and the seal chamber, a pump cover at... | 04/11/2000 |
