Abstract: A pump bearing member is disclosed for use in a pump bearing assembly and a gear pump assembly.

Abstract: A gear pump comprising:—a pair of gears (2) able to interact with a fluid crossing the pump (1);—a housing seating (3) of said pair of gears (2), said housing seating (3) comprising a rest plane (30) of a shim (4);—a delivery conduit (6) which develops from said housing seating (3) and comprising an inlet mouth (60). The inlet mouth (60) of the delivery conduit (6) is at a distance from an intersection (7) between a rest plane (30) of the shim (4) and remaining parts of the housing seating (3).

Abstract: A journal bearing assembly includes a first journal bearing disposed about a longitudinal end of a gear shaft and spaced a first distance from a first axial gear face. A first fluid film location and a first hybrid pad location are annularly between an inner surface of the first journal bearing and an outer surface of the gear shaft. The first hybrid pad location circumferentially adjacent to the first fluid film location has a minimum leading edge angular location of at least about 31.0° measured relative to a first bearing flat. A first porting path provides high pressure fluid communication from a location outside the first journal bearing to the first fluid film location at or adjacent to the first hybrid pad location.

Abstract: In order to adapt a balance piston unit of a compressor to a high speed, and to extend a service life of the compressor, a screw compressor according to the present invention includes a screw rotor including a rotor shaft, a radial bearing, a thrust plate, a balance mechanism, which is a slide bearing, a lubrication oil supply flow passage for supplying a lubrication oil, and a working fluid supply flow passage for supplying a working fluid for pressing the balance mechanism toward the thrust plate so that a reverse thrust load acts on the thrust plate.

Abstract: A groove is provided in the periphery of a pressure receiving area of a pressure receiving surface opposing to the load of axis weight within a bearing surface supporting an axis, and a liquid supply route communicating with the groove is provided so that liquid is supplied to the groove through the liquid supply route. In such a configuration, a bearing having a simple structure and a high compact load capacity and a liquid cooling type screw compressor using the above bearing are provided.

Abstract: A roller bearing assembly is configured to rotatably support a machine component connected with a shaft in a position relative to a reference component. The roller bearing assembly includes a radial bearing, an axially-displaceable axial bearing and an adjusting device configured to adjust an axial gap between the machine component and the reference component by automated axial displacement of the axial bearing. The adjusting device includes a hydraulic regulating device configured to axially displace the axial bearing.

Abstract: An intended purpose of this invention is to realize a gear pump suitable for delivery of high-pressure and high-viscosity fluids by using helical gears 2 and 3 meshing with each other. For this purpose, the gear pump includes introduction paths 121 and 131 for introducing the fluid from a discharge side toward shaft end sides of gear shafts 21 and 31 to apply shaft ends of the gear shafts 21 and 31 with fluid pressures counterbalancing axial thrusts produced by the helical gears 2 and 3.

Abstract: In order to provide, in vane pumps, an effective compensation of the radial and axial forces while at the same time increasing their useful service life, the vane pump for liquids is comprised of a slotted rotor (1) supported in a stator (4), wherein radially displaceable vanes (9) are slidingly disposed, which can be pressed slidingly supported while acted upon by centrifugal force, spring tension or otherwise by compressive force against a stator inside wall, in said process delivery cells are formed which expand or narrow in a crescent-like fashion and the entry of the liquid takes place through a hollow concentric stator and the filling of the vane cells from the inside to the outside. The rotor (1) is shaftless and of tubular construction, both sides are extended beyond the operating area determined by the vanes and the rotor is supported with the extensions in the outer stator, while the rotor possesses continuous vane slots from the internal to the external diameter.

Abstract: A rotary screw compressor that includes a male rotor and a female rotor cooperating together within a casing. The casing has a discharge outlet connected to an outlet port at a high pressure end of the working space and a suction inlet at the low pressure end of a working space. The rotor is rotatably supported at one end thereof through a bearing arrangement that includes a bracket fixed to an end cover. The bearing bracket projects into an axial cavity provided in the rotor to form a first chamber between the bracket and the rotor. The bracket is provided with an oil feed channel to feed oil into the first chamber. The rotor is rotatably supported at the low pressure end thereof through the bearing arrangement. The corresponding bearing bracket is mounted at the low pressure end of the working space and the outer circumferential surface thereof is provided with at least a groove connected to the oil feed channel and a recess connected to an oil drainage channel provided in the bearing bracket.

Abstract: 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. The intermeshing gear members respond to a clockwise rotary torque to pressurize fluid in transporting a fluid from an entrance chamber to a discharge chamber. The fluid in the discharge chamber acts on and urges the floating bearing and fixed bearing into engagement with portions of the first and second semicircular end walls and first side wall to seal the entrance chamber from the discharge chamber. The intermeshing gear members respond to a counterclockwise torque by transporting fluid from the discharge chamber to the entrance chamber to develop an internal fluid pressure. The internal fluid pressure acts on and urges the floating and fixed bearings toward the first and second semicircular end walls and second side wall.

Abstract: There is disclosed a trochoid pump in which a friction between a rotor and its support portion is reduced, thereby reducing a drive torque and wear of these parts. An inner rotor of the trochoid-type fuel pump is rotatably supported by a bushing through a bearing. An outer rotor is rotatably received in an inner periphery of a spacer. A first groove is formed in a portion of the outer periphery of the bushing disposed close to a discharge port, and a discharge fuel is introduced into this groove. A second groove is formed in a portion of the inner periphery of the spacer disposed close to the discharge port, and the discharge fuel is introduced into this groove. Although the inner rotor is urged toward the bushing by the fuel pressure of the discharge port, the urging force to urge the inner rotor toward the bushing is weakened by the discharge fuel introduced into the first groove, thereby reducing a friction.

Abstract: An external gear pump and/or motor of floating-shaft type comprising a front cover, a back cover and a housing forming a cavity in which a pair of meshed gears are mounted, characterized in that the gear shafts are brought toward the high-pressure side by means of a sleeve which can float radially under the pressure of the hydraulic oil and meanwhile said sleeves are pushed against the ends of the gears under the pressure of the hydraulic oil so that radial floating is achieved without any additional floating means in an external gear pump and/or motor. Therefore, the size of high-pressure zone and thereby, the inherent radial force are reduced in the gear pump and/or motor according to the present invention. Furthermore, its structure is simplified and reliable and its production cost is reduced.

Abstract: The bore of a bearing bush for a gear pump has a first recess located in a zone of load concentration in the bore, the first recess being supplied with a fluid under pressure. A second recess in the bore is located wholly outside the zone in which concentrated loads occur and acts as a reservoir for fluid, to prevent cavitation within the bore as a result of low pressures caused by radical movements of a shaft within the bush. A passage connects the second recess with a zone of lower pressure within the pump.

Abstract: A liquid pump, in particular for liquids having a low viscosity, for example, water, alcohols or other chemical liquids is provided of the type which includes a gear unit or a gerotor mounted in a housing which has an inner gear driven by a shaft. The inner gear of the gear unit is mounted on a bushing, the width of which is determined by the required hydrostatic support forces in such a manner that the support faces lie directly in the plane of the hydraulic radial forces.

Abstract: A drive ring for a rotary expansible chamber hydraulic motor has driving gear teeth on its inner periphery and is constrained against other than planetating motion by a series of angularly spaced eccentric bearings rotatably mounted in fixed port plates between which the drive ring is sandwiched. The eccentric bearings are hydorstatically balanced against peak loads with high pressure fluid. Vanes sliding in radial slots in the drive ring are maintained in engagement against a surrounding cylindrical chamber wall by leaf springs whose opposite ends slide in grooves in the port plates.

Abstract: A pair of mating gears are mounted for rotation about respective axes in a gear-type fluid displacing pump or motor. Each gear has a pair of shaft portions at opposite axial ends of the respective gear, and bearing members surround respective ones of the shaft portions for journalling the gears. Each bearing member of one of the gears is juxtaposed with a respective bearing member of the other of said gears and, during rotation of the gears, the juxtaposed bearing members are subjected to forces which urge the bearing members to move relative to each other, particularly in direction towards each other. An arrangement is provided to counteract such forces and to oppose such relative movement of the juxtaposed bearing members.

Abstract: A gear type hydraulic pump or motor wherein the stubs of the gears are surrounded by annular bearing members which are non-rotatably mounted in the housing. The forces which the stubs tend to transmit to the respective bearing members are counteracted by hydrostatic pressure fields produced by pressurized fluid which is entrapped in plenum chambers defined and completely surrounded by rectangular frame-like gaskets which are recessed into the surfaces surrounding the bores of the bearing members and are spaced apart from the nearest end faces of the respective gears. The gaskets may bear directly against the peripheral surfaces of the stubs or against the peripheral surfaces of cylindrical sleeves which are received in the bores of the bearing members and only the outer end portions of which are a tight fit in the respective bearing members.