Abstract: A fluid powered vane motor for operation with a minimum of externally supplied lubrication has a motor chamber made up of a cylinder with an eccentric cylindrical bore and end plates abutting the ends of the cylinder. A rotor with a plurality of axially oriented radial slots on its circumferential surface is supported on bearing means within the chamber. Radially slidable vanes are disposed in the radial slots of the rotor so that they form a moving seal between the rotor surface and the cylinder wall. Pressurized fluid introduced to the motor chamber acts upon the vanes of the rotor and imparts rotary motion thereto. Operation with a limited amount of externally supplied lubrication is accomplished by making end plates of inherently lubricious material such as fiber-reinforced polymeric material, and by coating the innner bore of the cylinder with a soft coating having lubricious properties in contact with the selected vane material.

Abstract: In a vane pump, a pump housing assembly contains a cam ring having an internal cam surface. A rotor carrying plural vanes is disposed within the cam ring and rotated by a drive shaft. Both end surfaces of the cam ring contact with a pair of flat contact surfaces formed within the pump housing assembly, respectively, and the vanes define plural pump sectors between the rotor and the cam ring, together with the rotor, the cam ring and the pair of contact surfaces. The contact surfaces are formed with a pair of intake ports and a pair of exhaust ports. Furthermore, one of the contact surfaces is provided with a pair of pressure leaking grooves formed at locations between the intake ports and the exhaust ports.

Abstract: Vane type positive displacement pump includes three separate vane type pump units on a single shaft, with spacers between the middle pump unit and both end pump units for axially positioning the pump vanes for the middle pump unit at both ends and axially positioning the pump vanes for the two end pump units at one end. The shaft has reduced diameter journal portions adjacent opposite ends of the barrel portion for the middle pump unit on which the spacers are mounted. Also, the outer diameter of the barrel portions for the two end pump units corresponds to the outer diameter of the journal portions for the spacers. At the other end of the end pump units are end bearings for axially positioning the vanes for the end pump units at such other ends.

Abstract: A rotary fluid pressure device is provided of the type including a housing portion (13), a gerotor gear set (15), and an endcap member (17). The gerotor gear set includes an internally-toothed ring member (19) and an externally-toothed star member (23) which orbits and rotates within the ring member. The star includes an end surface (24) disposed adjacent a stationary valve member (65), and another end surface (26) disposed adjacent the shaft housing. The star (23) defines high-pressure ports (93) and low-pressure ports (95) which engage in commutating fluid communication with valve passages (83) defined by the stationary valve member. The star (23) defines passages (101) and (103) which communicate with the fluid ports (93) and (95), respectively, and feed high pressure to a fluid chamber (113) having a transverse area (B).

Abstract: In a pump housing are installed a pair of pump rotors which rotate as one body with a rotating shaft. A plurality of vanes are mounted on these pump rotors to separate the internal space of each cam ring into a plurality of pump chambers. An intermediate side plate is positioned between the cam rings, which are held between one wall of the pump housing and a rear side plate. The intermediate side plate is constituted of a pair of side plates which are in contact with each other. A recess is formed in the inner peripheral part of one of the opposite sides of these side plates, forming a pressure chamber. A pressure fluid discharged from the pump chamber is supplied into this pressure chamber. The inner peripheral part of each side plate is elastically deflected by the fluid pressure of the pressure chamber into contact with the side of each pump rotor. Thus, gaps between the side plates and each pump rotor are narrowed, preventing fluid leaks.

Abstract: A fluid pressure energy translating device of the sliding vane type comprising a cam ring including an internal contour, a rotor having a plurality vanes rotatable therewith and slidable relative thereto in slots in the rotor with one end of each vane engaging the internal contour. The rotor and internal contour cooperate to define one or more pumping chambers between the periphery of the rotor and the cam contour through which the vanes pass carrying fluid from an inlet port to an outlet port. Two pressure chambers are formed for each vane and each vane has two surfaces one in each chamber, both being effective under pressure in the respective chambers to urge the vanes into engagement with the cam. Pressure sensing passages extend from the periphery of the rotor to one of the chambers to provide pressure to the chamber.

Abstract: A vane pump comprising a housing having front and rear surfaces and formed with a cam ring housing portion which is open to the front surface, the housing being further formed at its inner peripheral wall with recess portions and an axial bore extending from the rear surface, said axial bore being open to a center of the ring housing portion; a drive shaft freely rotatably supported in the axial bore of the housing; a rotor inserted on the drive shaft and engaged with the drive shaft, the rotor having a plurality of slits and a plurality of vanes each projectable from and retractable in the corresponding slit; a cam ring having at its inner peripheral wall a cam surface which is arranged to enclose the rotor therein and form pump chambers in cooperation with the vanes, the cam ring being formed at its outer peripheral wall with recess portions of substantially semicircular configuration in cross section; a front end plate by which the cam ring is closed at its one end; a rear end plate formed with a bearing p

Abstract: In a sliding-vane rotary compressor, one of the opposite open ends of a cylinder is closed by a first head, the other open end being closed by a side block to which is secured a second head so as to define jointly with the side block a low pressure chamber and a high pressure chamber. With this construction, one side block can be omitted and hence the number of structural components is reduced. Preferably, a displacement adjustment mechanism is incorporated in the side block and the second head for adjusting the displacement of the compressor.

Abstract: A rotary vane pump having a metallic rotor, rotatably positioned within an ellipsoidal cavity, a pair of stationary wear plates on the sides of the cavity, the rotor having a plurality of radial slots each of which contain a carbon composite vane riding against the ellipsoidal cavity in reciprocal motion to define variable volume pumping chambers and a pair of carbon composite rotor side plates each being positioned between one side of the rotor and the stationary wear plates, each of the rotor side plates having a similar pattern of congruent radial slots to that of the rotor, the vanes having sufficient width to extend into the slots of both side plates to drive the side plates with the rotor during operating.

Abstract: 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 plate against which one radial face of the pump package rotates, and which pressure plate is bolted to the housing. Another pressure plate within the large bore is pressed against the opposite radial face of the pump package by being exposed to an outlet pressure chamber of the pump. The area of the outlet pressure chamber to which the latter pressure plate is exposed is demarcated by axial sealing elements surrounding the drive shaft and exerting a compression force between a housing wall and the latter pressure plate. The construction effects a tight tolerance between relatively moving parts at all times including the start of pump operation.

Abstract: A steering power-assistance pump of vane type includes a combined flow control and pressure relief valve. When the steering valve of the steering arrangement shuts off the flow of oil, the output of the pump is converted into heat within the pump which accordingly suffers a substantial rise in temperature. The rotor of the pump and the cam ring with which the rotor vanes co-operate are combined with a pressure plate and a wear plate on respective sides of the rotor to form a unit which is displaceable in the axial direction of the pump against the force of a compressible sealing means for sealing off inlet ducts relative to a pressure chamber behind the pressure plate. The unit is thus displaced against the force of the compressible sealing means, as a result of thermally induced deformation of the housing portions of the pump. The wear and pressure plates have coatings of bearing metal on their surfaces which co-operate with the rotor, to provide better anti-friction properties.

Abstract: A vane type pump has an elongated pump housing through which the drive shaft of the pump passes. The usual components of the pump comprising a rotor which carries vanes within a cam ring is disposed between an inner end wall of the housing and a pressure plate wherein the pressure plate has pressure recesses or pockets. Damping chambers are provided in the elongated housing generally parallel to the drive shaft and substantially co-extensive with the housing bore that carries the drive shaft. Thus, very large volume damping chambers are provided for smoothing out pump pulsations in the course of operation.

Abstract: A rotary fluid pressure device of the type including a gerotor gear set (15) including a ring member (19) and a star (23). Adjacent the gerotor set is an endcap member (17) having an end surface (41) in engagement with the adjacent end surface (42) of the star. The disclosed invention relates to valve-in-star type valving whereby both the manifold valving action and the commutating valving action occur at the interface of the surfaces (41) and (42). Specifically, fluid is communicated from the inlet port (37) through a pressure chamber (43) into a manifold zone (57) defined by the star, then through a passage (65) into fluid port (61). The ports (61) are in commutating fluid communication with a plurality of stationary valve passages (51) defined by the endcap member (17), each of which is in communication with one of the gerotor volume chambers.

Abstract: A balancing plate for rotor valved gerotor motors is disclosed. The balancing plate is mounted on the opposite side of the high pressure rotor valving input with its own connection to high pressure to compensate for the pressure imbalance in the device.

Abstract: A rotary fluid pressure device is disclosed of the type including a gerotor gear set including a ring member (19) and a star member (23). Both manifold valving and commutator valving are accomplished at an interface between an end surface (42) of the star (23) and an end surface (41) of an endcap member (17). The endcap (17) defines three concentric pressure chambers (43), (51) and (47), and the star defines three concentric manifold zones (63), (67), and (65) which are in continuous communication with the pressure chambers (43), (51) and (47), respectively. The various manifold zones (63), (67), and (65) defined by the star communicate with fluid ports (69), (77) and (73), respectively which are also defined by the end surface (b 42) of the star (23).

Abstract: 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. To allow purging of vapor from the pump to enable the pump to be self-priming and to pump against a pressurized fuel line under hot fuel conditions, a purge port passage is provided at the circumferential area in which the pumping chambers start to ensmall. This purge port includes a passage leading to the outside of the pump inlet into the body of liquid in which the pump is submerged. Vapor is purged from the pump through this passage to allow normal pumping pressure to develop upon starting of the pump.

Abstract: The reversing of the direction of rotation of the motor of a fixed vane rotary compressor reverses the direction of rotation of the rolling piston. The rolling piston through viscous friction or frictional torque frictionally engages a reversing disk and causes the reversing disk to move between two positions depending upon the direction of rotation of the rolling piston. The reversing disk has a slot therein which forms the suction inlet and is moved by rotation of the reversing disk so as to be in fluid communication with the plenum which is serving as the suction plenum at that time.

Abstract: 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 outlet area. Resilient means are interposed between the ensmalling chambers and an outlet to block backflow of the pressurized outlet liquid into pumping chambers containing vaporized liquid instead of solid liquid, thus reducing the pump noise under conditions of vaporization termed "cavitation".

Abstract: In a vane pump, the cam ring must be fixed to an annular recessed portion of the housing in such a way that there exists no eccentricity between the cam ring and the rotor. To eliminate an eccentricity, a pair of semicircular grooves are formed on the inner circumference of the annular recessed portion diametrically opposed to the center thereof; a pair of semicircular grooves are formed on the outer circumference of the cam ring also diametrically opposed to the center thereof so as to provide two locating pin holes in cooperation with the two housing grooves, respectively; a pair of locating pins are pressure fitted, respectively, to the locating pin holes. Further, it is possible forcibly correct an eccentricity by selecting a locating pin having a diameter appropriately larger than that of the pin hole. The two locating pin holes are arranged in the direction of belt tension to eliminate the eccentricity due to belt tension.

Abstract: The pump has a casing, bearing members having portions for radial and axial mounting situated in the casing, at least one displacement element having journals rotatably received in the bearing members, a drive shaft extending from outside into the casing and sealed with respect to the casing by a sealing ring and drivably connected to one of the journals. At least the surfaces of each displacement element, of the journals, of the further elements and of the portion of the shaft inside the sealing ring are plasma-nitrided and the portions for axially mounting the journals are coated with a ceramic material. Also the portion of the shaft inside the sealing ring and the journals may be encased by a ceramic material.

Abstract: 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 the inlet and outlet sides of the pump. FIG. 2 illustrates a typical embodiment.

Abstract: A partition member is fitted within a casing at a location between an end wall of a pump housing accommodated within the casing and an opposed inner end face of the casing and cooperates with the one end wall to define a suction chamber therebetween. A first discharge pressure chamber is defined between an outer peripheral surface of the pump housing and an inner peripheral surface of the casing, and a second discharge pressure chamber between the above opposed inner end face of the casing and the partition member, respectively. The two discharge pressure chambers communicate with each other via passages formed through the partition member and the above end wall of the pump housing. A suction port and a discharge port are formed in the casing at the same axial side thereof, the former opening in the suction chamber in a substantially direct manner.

Abstract: An oil pump assembly comprises a pump body assembly composed of a pair of front and rear pump bodies, the rear pump body housing in a pump housing space a pair of pumps each including a pump cartridge having a rotor supported on a common drive shaft rotatably supported on the front pump body, and a cam ring accommodating the rotor. A single side plate is axially slidably interposed between the pump cartridges. A pressure plate is disposed between one of the pump cartridges remote from the front pump body and a pump discharge pressure chamber defined at the bottom of the pump housing space and communicating with a main passage through which one of the pumps communicates with a discharge port. The other pump is selectively connected by a directional control valve to the main passage. The pump and valve parts can easily be assembled into the pump bodies, and hence the oil pump assembly can be mass-produced efficiently, less costly, and is small in size and lightweight.

Abstract: A fluid pressure energy translating device of the sliding vane type comprising a cam ring including an internal contour, a rotor having a plurality of vanes rotatable therewith and slidable relative thereto in slots in the rotor with one end of each vane engaging the internal contour. The rotor and internal contour cooperate to define one or more pumping chambers between the periphery of the rotor and the cam contour through which the vanes pass carrying fluid from an inlet port to an outlet port. At least one cheek plate is associated with the body and rotor. Two pressure chambers are formed for each vane and each vane has two surfaces, one in each chamber, both being effective under pressure in the respective chambers to urge the vanes into engagement with the cam. A generally annular internal feed passage is formed entirely within the rotor and communicates with one set of the pressure chambers.

Abstract: 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 shaft is received in an internal cam bore of the cam ring. An end cover is secured to the pump housing in contact relationship with one of the side plates to cover an open end of the pump housing. A first positioning pin is fitted at one end thereof into an inner end wall of the pump housing for positioning the first and second side plates in a circumferential direction. A second positioning pin is fitted at one end thereof into one of the first and second side plates for positioning the cam ring in the circumferential direction.

Abstract: A vane compressor has a suction connector and a discharge connector arranged at a rear portion thereof. A rear suction chamber is formed at a rear side of the rear side block and communicates with pump working chambers. A passage means directly communicates the above rear suction chamber with an annular front suction chamber formed in the front head in a manner surrounding a sealing chamber accommodating a shaft-seal means.

Abstract: 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.

Abstract: A pump means has a housing having a cylindrical inner peripheral surface, a disc secured to the housing to constitute a working chamber together with it and provided with a central opening eccentric to the center of the inner peripheral surface of the housing, a rotor rotatively contained within the working chamber and adapted to be drivingly connected to a shaft introduced into the working chamber through the central opening of the disc, a number of radial vanes shiftably received within slots formed in the rotor and adapted to have their outer ends shiftably abut the cylindrical inner peripheral surface of the housing, and overlapping portions formed by a portion of the disc and a portion of the rotor so as to be in an overlapping relationship with each other in the direction of the shaft in a contacting or non-contacting state with each other.

Abstract: 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, pressurized and expelled from the pump at an elevated pressure. The improvement including passages in flow communication with the pressurized side of the pump vanes, and an auxiliary outlet communicating with the passages to provide an auxiliary pressurized liquid outlet from the pump, wherein the auxiliary pressure is developed by the pump vanes.

Abstract: A rotary vane pump, in particular for steering assistance, comprising a rotor (7), a cam ring (5) and a pressure plate (4). The housing (1) has two parallel bores (17a, 17b) and cast passages (18a, 18b) as feed passages which each split up into two flow paths (23, 24) in the region of the pressure plate (4) and the cam ring (5). The outlet passages (31, 32, 33) are of a similar configuration.

Abstract: There is disclosed for use in powering a hoist or the like a pressured fluid powered machine of the rotary vane motor or pump type, improved means for "lifting" and maintaining the vanes in pressure-sealing contact with the wall of the machine casing, and for substantially preventing pressure losses around the ends of the vanes particularly when the machine is starting up and/or operating at low speeds. A pair of resilient "lifting rings" are provided to ride under the vanes at opposite ends thereof and "air cushion" float about specially shaped seals fixed upon opposite ends of the casing, so as to function at all times to maintain the vanes in contact with the machine casing inner wall. The seals operate to prevent fluid leakages via the vane accommodating slots in the machine rotor around the ends of the vanes; thereby providing the machine with a smooth torque output capability at start-up and low operating speeds, such as is of particular importance in hoisting machine systems.

Abstract: A remote reservoir power steering type pump has a shaft seal which prevents shaft bearing lube flow from leaking to atmosphere. The lube flow is derived from internal pump leakage along the shaft. This fluid must be returned to the main system fluid. In remote reservoir type pumps, the pressure inside the pump housing is greater than atmospheric pressure due to the supercharge gained through aspiration. The shaft seal area is maintained at substantially atmospheric pressure by bleeding or draining this area to the supply port which is not subjected to the supercharge pressure thereby maintaining the seal area at the lower pressure.

Abstract: A vane type hydraulic pump has a pressure plate, thrust plate, cam ring, rotor and vanes, which when assembled, are denoted as the pump rotating group. The thrust plate, pressure plate and cam ring are maintained in axial and angular alignment by a pair of dowel pins which extend between the plates and through the cam ring with a close fit relationship. The plates and cam ring are restrained from rotation by a dowel pin which extends between a close fit in the pump housing and a loose fit in the pressure plate. The rotating group is disposed in a cylindrical cavity in the pump housing which cavity has a diametral dimension cooperating with the outer diameter of the pressure plate and thrust plate to provide a sliding pilot fit at assembly thereby sharing the axial alignment constraint of the pair of dowel pins.

Abstract: In a sliding vane type of rotary pump usable for power steering systems a seal of hour glass shape is provided between the flow directing plate, on the outlet side of the vane rotor and the outlet pressure chamber, to confine exposure of the high pressure of the outlet chamber to the downstream side of the plate within a predetermined area only partially balanced by exposure of the upstream side to such high pressure and to also isolate suction passages from the outlet chamber pressure. The result is a flexing of the flow directing plate at the center toward the pump rotor to reduce rotary clearance and permit the use of thinner and lighter weight flow directing plates.

Abstract: A bearing and seal assembly for use in a hydraulic pump has a housing with a stepped outer diameter. The smaller diameter encloses a roller bearing and is adapted to sealingly seat in the pump housing. The larger diameter is disposed within the pump housing and encloses a seal member adapted to sealingly contact a stationary internal pump component so as to cooperate therewith in sealing against leakage of high pressure fluid from the pump. A shoulder between the stepped diameters abuts a radial inner wall of the pump housing. The high pressure fluid within the pump acts on the seal end of the assembly thereby urging the shoulder to remain in abutment and assist in sealing against fluid leakage.

Abstract: A vane type hydraulic motor which is operable with seawater as the hydraulic fluid for undersea diver use. The motor is compact, lightweight and is lubricated by the seawater working fluid. The motor uses corrosion resistant materials with the requisite flexibility, mechanical strength, friction characteristics and low swelling rate when immersed in seawater. The motor structure provides durable seal means and pressure balanced operation which minimizes wear. The vane structure permits easy sliding vane movement, and uses the seawater pressure to control vane movement and sliding seal capability.

Abstract: A rotary fluid pump of a non-lubrication type having a pump cavity formed within a cylindrical stator housing and a pair of recessed end head assembles. A drive shaft is eccentrically journalled in the end heads with a rotor mounted thereon with vanes slidably disposed in radial grooves in the rotor. A pair of sealing plates disposed between the ends of the stator having and the end heads divide the pump cavity into a pair of end chambers and an intermediate rotor chamber. An outlet port provides fluid communication between the rotor chamber and a discharge hole in one of the end chambers so that fluid passage for discharge to the atmosphere is provided through the rotor chamber, outlet port, end chamber and discharge hole.

Abstract: A rotary fluid pump of the type having a housing body and a pair of recessed end heads assembled to opposite ends of the housing. A pair of resilient sealing plates may be disposed between the side of the housing and the recessed end heads to define a rotor chamber having a rotor with slidable vanes mounted thereon. Fluid inlet and outlet ports adapted to communicate with the rotor chamber are formed either in the sealing plates or in the end heads to provide pairs of inlet and outlet ports.

Abstract: A rotary pump having a housing with a cylindrical cavity and end heads at each end to form a pump cavity. A drive shaft journaled by bearings carries a rotor having a number of movable vanes. Seal plates at each end of the pump cavity to divide it into a pair of end chambers defined by the seal plates and the end heads. Fluid inlet and discharge ports are provided in the sealing plates. The ports are formed as protrusions in the end plates towards the end chambers, as recesses therein or extending as openings into the end heads.

Abstract: A gerotor machine has a housing and a displacement unit in the housing. The displacement unit includes an inner gear wheel rotatable about an axis, and an outer gear wheel which has an axis circularly displaceable about the axis of rotation of the inner gear wheel. The gear wheels bound a plurality of displacement chambers therebetween. A plurality of recesses are formed between the teeth of one of the gear wheels, and each of the recesses has two circumferentially spaced control edges at one axial end of the one gear. The housing is provided with a plurality of control openings which are located relative to the axis of the one gear at a radial distance corresponding to that of the recesses. The control edges of the recesses of the one gear cooperate with the control openings of the housing and are operative for communicating the control openings with the chambers of the displacement unit.

Abstract: A rotary fluid pump has a stator housing with a generally cylindrical cavity extending therethrough and a pair of recessed end heads assembled at opposite ends of the housing to form a pump cavity therewith. A drive shaft is journalled in the end heads by bearings and extending eccentrically into the interior of the pump cavity and a rotor is mounted on the drive shaft within the pump cavity. A pair of sealing plates of different thickness are individually disposed between the ends of the stator housing and the end heads to divide the pump cavity into a pair of end chambers defined by the end head recesses and the plates and an intermediate rotor chamber defined by the plates. A plurality of vanes are slidably disposed in an equal plurality of grooves radially formed in the rotor. The drive shaft is constrained to prevent axial displacement by stoppers, washers or a combination thereof mounted on the shaft and contacting bearings that support the shaft. The bearings are fixed to one end head.

Abstract: A dry rotary fluid pump or compressor includes a rotor eccentrically supported in a rotor chamber generally defined by a stator housing and two end heads. Two side plates each interposed between the housing and each of the end heads form end chambers between the respective side plates and end heads. The end chambers are supplied with a pressure higher than that of the rotor chamber so as to bring the side plates into close contact with opposite side faces of the rotor. The side plates are formed of a material having an abrasion resistance higher than that of at least the opposite side faces of the rotor.

Abstract: A high-pressure rotary fluid-displacing machine is described which is suitable for use as a motor or pump. It comprises a housing, an internally toothed annular gear, an externally toothed pinion arranged eccentrically within said annular gear and intermeshing therewith, an engagement-free crescent-shaped gap being left between the addendum circles of the pinion and of the annular gear, respectively, on the side thereof opposite the contact point of the pitch circle of the pinion with the pitch circle of the annular gear, a shaft bearing the pinion and being adapted for transmitting torque, and a gap-filling member in the gap having an inner and an outer curved surface, the inner surface being sealingly contacted by the addendum surfaces of the teeth of the pinion, and the outer surface being sealingly contacted by the addendum surfaces of the teeth of the annular gear.

Abstract: A positive fluid pump is provided which is capable of being cleaned in place by a circulating cleaning solution without the various pump components being disassembled. The impellers for the pump are rotatably mounted within a chamber formed in a housing. The inlet and the outlet for the chamber are separated from one another by the engaging impellers during normal operation of the pump. One of the side walls forming the pump chamber is provided with a cavity in which is slidably and sealingly mounted a wall piece. Under normal operation of the pump, the wall piece assumes a first position wherein one surface thereof is disposed adjacent the corresponding end faces of the impellers. When, the pump is being cleaned in place, the wall piece assumes a second position independently of the impellers wherein the one surface thereof is recessed from the pump chamber and the inlet and the outlet are interconnected permitting the cleaning solution to circulate through the chamber and around the impellers.

Abstract: In a rotary sliding vane pump having a non-circular cam ring which expands and contracts radially, a cheek plate is clamped against the end face of the cam ring and lies in rubbing contact with the rotor and vanes. The cheek plate has a wearing face of low friction material such as bronze. Unwanted wear between the cheek plate and the cam ring due to its expansion/contraction movements is reduced by the provision of one or more areas of hard metal adjacent the cam ring.

Abstract: An improved pump assembly includes a pressure plate having inlet and outlet ports for conducting fluid to and from a pumping chamber. The pressure plate includes three layers formed by plate sections having major side surfaces which are bonded together to prevent leakage between the layers. A first one of the plate sections has an outer side surface which is disposed adjacent to the pump rotor. This first plate section is advantageously made of a wear-resistant material to minimize wear upon rotation of the rotor. An intermediate plate section is disposed between the first plate section and a second plate section. The intermediate plate section cooperates with at least one of the two outer plate sections to form a passage which interconnects a pair of ports formed in the pressure plate. In the illustrated embodiment of the invention, the passage is utilized to connect a pair of inlet ports in fluid communication.

Abstract: A rotary fluid pump or compressor having a pair of flexible diaphragm type sealing plates which are clamped on opposite ends of a stator housing by end heads to form a cylindrical pump cavity and to be pressed onto the opposite end faces of a rotor driven within the pump cavity so as to provide sealing between the suction, compression and delivery chambers. Each of the sealing plates comprises a flat flange portion clamped between the end faces of the stator housing and the end head and a substantially cone shaped portion extending radially inwardly from the flat flange portion to be pressed onto the end face of the rotor and substantially coinciding at its apex with the axis of the rotor.

Abstract: A working member, i.e., an eccentric drive ring having internal teeth, orbits about a driven pinion having a lesser number of teeth to achieve gear reduction. Hydraulically expressed divider vanes on the orbiting drive ring engage the inner periphery of a surrounding fixed ring to define working chambers between the outer periphery of the drive ring and the inner periphery of the fixed ring. Port plates on opposite sides of the drive ring are respectively exposed to high and low pressure fluid. Valving occurs when slots on opposite sides of the drive ring are exposed to ports on the port plate as the result of the orbital movement of the drive ring, so as to establish fluid flow paths to and from the working chambers.

Abstract: An external gear type fluid power motor wherein a rotor receives two groups of gears each including a sun gear and one or more planet pinions. The sun gears are coaxial with each other; one thereof is fixed and the other drives an output shaft. Each planet pinion of one group is integral with a planet pinion of the other group or is nonrotatably coupled to it by an oldham coupling. Pressurized fluid is admitted by way of passages machined into a supporting member which is rigid with the housing and rotatably supports one end of the rotor. Such fluid flows through passages in the rotor and rotates the planet pinion or pinions of one or both groups whereby the planet pinion or pinions of one group roll along the fixed sun gear to drive the rotor and to cause the planet pinion or pinions of the other group to roll about the other sun gear which thereby rotates the output shaft. The stubs of the gears can be mounted in discrete bearing members or in covers which form part of the rotor.

Abstract: The pressure acting on a pressure loaded cheek plate in a pump is selectively vented by a servo valve actuated by the buildup of pressure in the pump outlet caused by normal parasitic losses in a downstream hydraulic flow circuit. Since it may be desirable to actuate the servo valve by the pressure drop across an orifice in the outlet line or by a suitable orifice in the pump return to pump, both embodiments are disclosed as exemplary means for achieving the premises of this design.