Abstract: A lubrication scavenge system for an engine bearing compartment or the like utilizing a gear pump with two or more independent inlets with separate flow paths through the pump. The inlets and flow paths are maintained separate from each other by the use of inlet and discharge seal arcs to avoid any fluid communication therebetween. The pump can operate to pump different fluids through each inlet with the fluid being either a gas or liquid or a mixture of both and with the pump continuing its pumping action when there is an instantaneous interchange in the fluid being pumped at each inlet as can occur when the engine bearing compartment is subjected to varying positive and negative gravity forces.

Abstract: A rotary positive-displacement fluid-pressure machine of bi-directional type including a casing, intermeshing rotors, and a pressure-balancing arrangement, associated with the end face, remote from said rotors, of the or each end plate means of the machine. Each arrangement comprises sealing means which separate a plurality of areas on said end face, certain being subjectable to high, and others to low, fluid pressures. A further area defined by further sealing means and subjectable only to high fluid pressure is in a zone opposite, and is in positional correspondence with, that zone of the face of the end plate means engaging the rotors which is in registry with the region where the rotors mesh. The further area extends through and beyond the common plane of the rotor axes towards the low pressure side of the machine.

Abstract: An apparatus for an hydrostatic compensation of hydraulic pumps and motors of gear type in which two intermeshing gears are mounted on shafts which are supported by bearings or journal-bearings which can slide within the cavity of a pump or a motor housing closed on both lateral sides by covers. Compensation chambers between the bearings and the covers are delimited by grooves respectively provided in the faces facing bearings and covers. A part of one side of the grooves provided in the bearings is in alignment with one of the grooves provided in the corresponding cover. Deformable tightness seals are arranged in said grooves.

Abstract: 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 means comprising a bobbin and first and second axial seals mounted on the bobbin.

Abstract: A gear pump structure is provided having a housing with a pump chamber, a suction chamber and a discharge chamber communicating with said pump chamber on opposite sides thereof, a suction port and a discharge port in said housing communicating respectively with the suction chamber and discharge chamber, each of said ports have spaced apart inlet and outlet means, said suction port being contoured to provide on introduction of fluid into the inlet end a point intermediate its inlet and outlet means having a pressure higher than the pressure at the inlet and outlet means, at least one pair of meshing gears mounted for rotation in said pump chamber and each having two axially spaced trunnions, a plurality of bearing means in said housing each having an axial bore mounting said trunnions for rotation in the pump chamber, drive means for rotating said gears so that liquid which is drawn through the suction port into the suction chamber is engaged by teeth on said gears and transferred to the discharge port under p

Abstract: A reversible gear machine which can be used either as a gear pump or as a gear motor regardless of the pressure gradient direction between its inlet and outlet ports includes a housing accommodating meshing gears for rotation about their respective axes which are defined by respective stub shafts extending axially beyond the end faces of the gears. At least one pressure element, which may be constituted by bearing members for the stub shafts, and which is movable axially of the respective stub shafts, has a surface facing away from the gears. A sealing component including a relatively rigid support ring and an elastically yieldable sealing body is accommodated in a groove of the sealing element provided at the aforementioned surface of the latter, such that the support ring contacts the close end wall of the housing and a rib of the sealing body contacts the bottom of the groove and subdivides the latter into two compartments.

Abstract: A hydraulic gear machine which is particularly suited for use as a reversible hydraulic gear motor includes a pair of gear elements having externally meshing outer peripheral gear portions and stub shafts which are supported in an internal chamber of a housing on respective sleeve-shaped bearings. Two such bearings are arranged at each axial side of the gear elements, one for the stub shaft of each of the gear elements which extends to this axial side. The housing includes a circumferential wall and two end walls. Sealing elements having the configuration of the numeral three are arranged at the interfaces between the bearings and the end walls. The sealing elements are oppositely oriented with respect to a common plane including the axes of rotation of the gear elements at the respective axial sides.

Abstract: A rotary machine has a plurality of rotors rolling over one another and defining therebetween and end covers at least one working chamber, and at least one sealing plate at at least one side of the rotors and arranged so that an opposite side of the sealing plate communicates with the working cavity and the working medium flowing to the opposite side of the sealing plate presses the latter against one end face of the rotors. Insert members of bearing have conical surfaces receiving the shaft and can turn about their axes to compensate for wear.

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: An arrangement for aligning a drive shaft of a fluid-operated gear machine having a cover enclosing a housing of the machine is provided. The aligning arrangement includes a plate connected to the axial end face of the cover, which side is directed to a pair of meshing gears mounted within the housing of the machine. This plate is formed with an opening receiving the drive shaft without a play when the cover is placed in a position in which it sealingly closes the housing.

Abstract: A gear machine, such as a gear pump or gear motor, has a housing in a chamber of which there are journalled two gears which mesh with one another. One of the gears is mounted on a drive shaft the end of which is extended outwardly from the housing. The housing is closed at one side thereof with a cover having a stepped bore for receiving the end portion of the drive shaft. The cover is formed with a circumferential projection concentric with the drive shaft and adapted for centering the cover relative to an external element to be coupled with the gear machine. The stepped bore provided in the cover forms a chamber in which a centering ring with a certain radial play is positioned, which centering ring surrounds the drive shaft. A sealing ring is also positioned in the chamber formed in the stepped bore, which sealing ring sealingly closes the housing. The centering ring provides for reliable aligning of the gear machine to the external element adapted to be coupled with the machine.

Abstract: An improved gear pump or motor includes seal plates (30, 32) having a lubrication channel (48, 50) communicating between the shaft bearings (18, 20, 22, 24) and the low pressure side of the zone (62) where the gear teeth (58, 60) intermesh. Lubricant flow is directed first through one bearing on one side of the pump and then back through a separate channel (54, 56) to the other bearing on the same side of the pump. Placement of the lubrication channels on the low pressure side of the pump where the volume between intermeshing teeth is increasing and the pressure between the teeth is below inlet pressure ensures that flow reversals in the bearings and lubricant aeration are avoided; and renders bearing flow rate less sensitive to pressure, so that relatively large flow channels may be used in the wear plate.

Abstract: A vane type compact pump for use in a power steering system having a remote reservoir includes a substantially cylindrical housing with a central cylindrical cavity. The cavity has a large opening at one end of the housing and a shaft opening at the other end. A pressure plate, cam, rotor and vane assembly and a thrust plate are axially aligned and positioned in the cavity with the thrust plate being adjacent to and closing the large open end of the cavity. A locking ring engages the housing and limits the axial movement of the thrust plate toward the large open end. A drive shaft is rotatably supported in a bearing in the housing and in a bearing in the thrust plate. The drive shaft is drivingly connected with the rotor intermediate the bearing supports.

Abstract: A liquid displacement device which utilizes an internal unit assembly type construction wherein the internal unit assembly can be installed in or removed from a cavity in the housing of the device as a unit. The internal unit assembly includes a pair of meshed gears, which are rotatably supported by a pair of axially spaced end plates disposed on opposite sides of the gears. The internal unit assembly also includes at least one pair of thrust members and at least one corresponding pair of axial pressure loading chambers which bias the thrust members in a direction to counterbalance the axial components of the pressure force at the discharge side of housing that tends to separate the end plates from predetermined positions with respect to the side faces of the gears.

Abstract: A rotary positive-displacement fluid-pressure motor which includes a casing, having an inlet port and an outlet port, at least two intermeshing rotors of toothed or lobed form housed for rotation in the casing, and means for conducting pressure fluid derived from the inlet port as far as a predetermined position in a face adjacent, and engaged by, a side of one of the rotors. A recess is so disposed in that face intermediate the predetermined position and the outlet port that, for facilitating starting of the motor when fluid under high pressure is directed into the inlet port, some of that fluid can gain access to the recess by way of said means and whichever intertooth or interlobe space of that rotor is so positioned as to place the means and the recess in communication.

Abstract: A rotary positive-displacement fluid-pressure machine which includes a casing, two intermeshing rotors, end plate means associated therewith, and a pressure-balancing arrangement associated with the end face of each end plate means remote from the rotors and with an adjacent casing face. The arrangement comprises sealing means which separate, one from another, a plurality of areas on said end face individually subjectable to fluid-pressures and which comprise resilient members disposed in respective grooves, as well as a non-extrudable element against portions of which those members bear. The members and element together establish fluid-sealing between the end face remote from the rotors and the adjacent casing face. At least one portion of said non-extrudable element is so disposed as to cross a respective land which is recessed to accommodate that portion.

Abstract: A liquid displacement device which utilizes an internal unit assembly type construction wherein the internal unit assembly can be installed in or removed from a cavity in the housing of the device as a unit. The internal unit assembly includes a pair of meshed gears, which are rotatably supported by a pair of axially spaced end plates disposed on opposite sides of the gears. The internal unit assembly also includes at least one pair of thrust members and at least one corresponding pair of axial pressure loading chambers which bias the thrust members in a direction to counterbalance the axial components of the pressure force at the discharge side of housing that tends to separate the end plates from predetermined positions with respect to the side faces of the gears.

Abstract: A self-sealing gear pump has seals formed between the end faces of the gear wheels and adjacent faces of a casing of the pump by thrust plates interposed between the end faces of gear wheels and the casing. The thrust plates have cavities formed behind them and are pressed against the end faces by the pumped fluid under pressure being admitted to the cavities. Each cavity is connected to both the high pressure side of the pump and the low pressure side of the pump by ports or nozzles, the flow section of the nozzle leading to the high pressure side being larger than that of the nozzle leading to the low pressure side. The surface area of each thrust plate exposed to its cavity is greater than its surface area exposed to the high pressure side of the pump and each cavity and the fluid connections to it are constructed as a hydraulic potentiometer which causes the pressure in the cavity and hence the sealing pressure of the plate against the gear wheels to be adjustable.

Abstract: A rotary impeller pump or motor is provided having a case, a pair of rotary impellers in said case, a plate having a first face divided by lands into a plurality of chambers against corresponding ends of the impellers and a second face having two counterbores around the rotary impellers, annular seal means intermediate the ends of each counterbore forming a pair of chambers within the counterbore, opposed inlet and outlet ports in said case whereby said plate is balanced in pressure on opposite sides by fluid in said chambers on the first face and the counterbores.

Abstract: A gear pump having a pair of intermeshing gears which operate in a housing and which are supported by a pair of bearing blocks which are biased towards the side faces of the gears for effecting a seal. There is interposed, between each bearing block and the adjacent side faces of the gears, a flexible plate which on its outer side is pressure-loaded by pump-delivery pressure admitted to an area of the plate confined by a linear seal element that includes part-circular portions extending around the gear axes at a radial distance appreciably smaller than the radius of the root circle of the gear teeth.

Abstract: A rotary machine, such as a rotary engine, a rotary pump and the like, has a plurality of rotors which are so arranged and shaped that they roll over one another and together bound a permanently closed during rotation, working chamber. This working chamber is closed peripherally by the rotors, and axially by covers. The shape of the rotors may be formed by an inner envelope of a square which is connected with an inner larger circle rolling over a smaller circle. The shape of the rotors may also be produced by an inner envelope of a triangle whose inner larger circle rolls over a smaller circle.

Abstract: Hydraulic equipment useful as a pump or motor intended for applications where hydraulic fluid is exposed to contamination by abrasive particulate material is disclosed. Leakage paths from the high pressure chamber in a gear pump or motor are provided with inserts of an abrasion and erosion resistant material at points where wear from abrasives in the hydraulic fluid is aggravated. In particular, the bearing surfaces of the pressure loaded side plates are provided with an insert of abrasion and erosion resistant material in the mesh region of the teeth. Erosion and abrasion resistant rings are located on the side plates in the region surrounding the openings for the shafts and extending interiorly of the tooth root circle to the journal bearings.Also disclosed are radial sealing shoes which are supported by the side plates and are radially urged into sealing relationship with the tips of the teeth by the pressure existing at the high pressure side of the gears.

Abstract: A gear positive displacement machine has two meshing gear members each having two axially opposite shafts, two pairs of bearing members each of which pairs bears one shaft of both gear members, at least one sealing member at one axial end of the gear members, and a supporting element reinforcing this sealing member. The supporting element has a U-shaped cross-section with two arms and a bead at a free end of each arm. The sealing member is inserted by its base side in the supporting member, and the beads of the arms of the latter engage in two grooves formed in the supporting member.

Abstract: A fluid gear pump or motor has a central housing with an end cover on one side and an adapter cover on the other. A pair of gears are rotatable inside the housing and one gear shaft extends through the adapter cover for attachment to another machine. The adapter cover is mechanically grounded to the attached machine. Internal loads on the gear shafts are transmitted to the bearings on either end of the shafts in the two covers. One centering plate transmits the loads from one pair of bearings in the end cover to the housing. Another centering plate transmits the loads from the housing and the other bearings to the grounded adapter cover.

Abstract: A rotary impeller pump or motor is provided having a case, a pair of rotary impellers in said case, a plate having a first face divided by lands into a plurality of chambers against corresponding ends of the impellers and a second face divided by sealing means into a similar plurality of chambers between the plate and case, opposed inlet and outlet ports in said case whereby said plate is balanced in pressure on opposite sides by fluid in said chambers on the first and second faces.

Abstract: A seal mechanism in gear pumps or motors, in which a pair of gears engage, so that at least one side surface of these gears is sealed by a pressure plate movable in the direction of the shaft, the said pressure plate is partitioned by a seal member in the shape of a figure "3" at the back into the low pressure zone and the high pressure zone which lead to the inlet side pressure and the outlet side pressure, respectively, both ends of the said seal member are formed in a loop-like shape, and block members for backup use, movable with respect to the pressure plate, are housed in the loop-like parts, so that the said block members may be pressed toward the low pressure side through the seal member by the liquid pressure which is connected to the high pressure zone during the operation of the gear pump or motor, so that these block members may press the end parts of the seal member to the inner wall surface of the gear bower in the housing and so that no liquid may leak from these parts.

Abstract: A pump for pumping a fluid such as a fuel having poor lubricating qualities, comprising a matched set of pumping gears carried on rotatable shafts, with said shafts mounted for rotation within matched sets of floating bushings.

Abstract: A gear pump or motor and a thrust plate therefor are provided having a case, a pair of rotary gears in said case, said gears having axial stub shafts journaled in said case, a unitary thrust plate for the corresponding ends of the pair of rotary gears adapted to lie between the case and the ends of the gears, said thrust plate being of a metal softer than the gears and having a front face adapted to abut the gear ends and a rear face abutting the case, a pair of spaced openings extending through said plate to receive the gear stub shafts, a pair of annular grooves in the rear face spaced from and surrounding each of said openings, a groove in the rear face connecting said annular grooves at their closest points, at least one groove in the rear face extending radially from each annular groove to the periphery of the body generally opposite the groove connecting the annular grooves defining at least two substantially identical areas on opposite sides of the body, a generally U-shaped elastomer gasket having the

Abstract: A pressure plate provides metering grooves in a face thereof contiguous to the gears of a gear pump. The grooves communicate certain pockets between adjacent gear teeth with other such pockets so as to meter fluid from pockets in which fluid is trapped at relatively high pressures to pockets in which fluid is trapped at relatively low pressures, thereby controlling the pressure distribution.

Abstract: A positive displacing machine has a housing having an interior chamber provided with an open end, a cover closing the open end of the chamber, movable working members located in the chamber and in operation producing high pressure in the same, sealing means including an annular groove formed in one of the elements around the open end of the chamber and a sealing member received in the groove, and a further annular groove formed in one of the elements radially outwardly of the first-mentioned groove and communicating with a space which is under pressure lower than the pressure in the interior chamber of the housing. The housing may have two open ends closed by two covers, and the above grooves may be provided in both end portions thereof. The grooves may be formed both in the housing, and in the covers. The further grooves may be open at a circumferential surface of the housing.

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 pump or motor comprises a tubular casing having an internal shoulder and an inlet and outlet for working fluid. A pair of meshing gearwheels are each mounted in the casing between a pair of rigid bearings which are disposed one on either side of the shoulder adjacent respective end plates closing the ends of the casing. Screws passing through the shoulder are provided for clamping the shoulder between the bearings and end plates. In an unclamped condition of the shoulder, the difference between the axial lengths of the shoulder and the gearwheels is greater than a predetermined operating clearance between the gearwheels and the bearings. In a clamped condition of the shoulder in the normal operating conditions of the pump or motor, the shoulder is resiliently deformed to reduce the said difference to a value at most equal to the predetermined clearance.

Abstract: A gear pump is disclosed wherein the shafts of at least a pair of intermeshing gears are rotatably supported in bushings each with an axially extended lubrication groove formed in the bore of the bushing, one end of the lubrication groove being communicated through a low pressure chamber defined in the inner end face of the bushing with a portion of a suction port located adjacent to the root or dedendum circle of the gear while the other end of the lubrication groove being communicated with the suction port through a hole extended through the bushing or casing or notch formed therein, whereby part of the liquid drawn through the suction port upon rotation of the intermeshing gears is forced into the pressure chamber because of the fact that the liquid drawn into each tooth space of the gear is imparted with the impact speed directed in the radial direction of the tooth space due to the difference between the speed with which the liquid is drawn into the gear pump and the rotational speed of the intermeshing

Abstract: Disclosed is a pressure loaded gear pump wherein two assemblies each consisting of a pair of abutted bushings are axially slidably fitted into a casing on both sides of a pair of intermeshing impeller gears for supporting rotatably the shafts thereof and for sealing the side faces of the gears; and defined on each side of the casing between the pair of abutted bushings and an end plate are a low pressure chamber into which is admitted the hydraulic pressure in a suction opening, a high pressure chamber into which is admitted the hydraulic pressure in a discharge opening and two moderate pressure chambers each of which is communicated with a sector between the suction opening and the pressure transition or gradient sector of the liquid passage from the suction to discharge openings. The effective area of each moderate pressure chamber is equal to or slightly greater than the cross sectional area of the space between the teeth of the gears.

Abstract: A gear-type fluid displacing machine includes a housing having a chamber and two side sections overlying opposite ends of the chamber, a pair of mating gears in the chamber for generating a high pressure area therein as the gears rotate, and annular bearing members surrounding trunnions associated with the gears at opposite ends of the chamber each of the bearing members having an end which faces one of the side sections of the housing and being formed with a groove. The sealing arrangement includes a generally U-shaped resilient sealing element in each of the grooves and having an open side in communication with the high pressure area. The sealing element has at least one wedge-shaped leg which is pressed into sealing contact with an associated side section by its own resilience and by the force exerted by the pressure fluid entering the open side of the element from the high pressure area.

Abstract: A balanced rotary sliding vane pump has a flexible cheek plate slightly spaced from the rotor and vanes. A hydrostatic pressure pad exposed to outlet pressure urges the cheek plate to deflect toward the rotor and is fully effective at low speeds. A pressure force opposing this deflection at higher speeds is produced by restricting the outlet for fluid discharged by the inwardly moving vanes, thus augmenting the pressure field applied in the clearance space between the rotor and the cheek plate. This speed responsive change in the cheek plate deflection provides for a high volumetric efficiency at slow speeds and also reduces the possibility of cheek plate wear and seizure at higher speeds when volumetric efficiency is less important.

Abstract: An external gear pump wherein the gears are installed in an eight-shaped compartment of a central housing section which is flanked by two covers. The outlet port of the housing communicates with two arcuate recesses for metallic inserts which are biased against the adjacent gears by fluid pressure in the outlet port whereby the inserts urge the gears against those portions of the internal surface of the central housing section which are located opposite the recesses. Such portions of the internal surface are formed with narrow first cutouts which communicate with the outlet port. The internal surface is further formed with relatively wide additional cutouts which are located between the first cutouts and the recesses and communicate with the inlet port. The force which is produced by fluid in the cutouts opposes the force which urges the gears against the internal surface of the central housing section to thus reduce the force with which the stubs of the gear shafts are urged against the housing.

Abstract: A housing of the gear motor accommodates a pair of meshing gears which are rotatably mounted in the interior of the housing and which each have a first and a second axial end face. Sealing elements are provided which are located proximal to the respective axial end faces, and an arrangement is provided for forming first fluid-pressure fields which press the sealing elements against the axial end faces. Adjacent at least one of these sealing elements there is provided a space in which an auxiliary fluid pressure field can develop, and an arrangement is provided by means of which the space can be pressurized when it is desired to form therein the auxiliary fluid pressure field so that the same may exert auxiliary pressure upon the associated sealing element to aid in pressing the same against the respective axial end face, and by means of which the space can be vented when such auxiliary pressure is not desired.

Abstract: In a fluid motor or pump, a combinaton is disclosed having an internal ring gear operably secured within a housing meshing with a pinion gear and having a wedge with a shape conforming to the outer peripheries of the ring and pinion gears to provide a sealing effect and pressure or suction chamber where the wedge has a piston end and porting in the tip thereof to create a hydrostatic pressure in an operable direction to overcome pressure from the chamber and means for supporting the pinion gearing and carrying the wedge in slidable relatonship where the mechanism receives fluid under pressure from a source to the pressure chamber and includes means for returning fluid to the source.

Abstract: A hydraulic gear machine which may be utilized as a pump or motor has a housing forming a cavity in which a pair of gears having meshing teeth is mounted for rotation. Sealing elements are interposed between the axial ends of the gears and the bearings mounting the gears for rotation; these sealing elements have first surfaces which face the gears and second surfaces facing the bearings and being formed with recesses which form fluid-pressure spaces. At least one seal member is provided adjacent the respective second surfaces and serves to delimit the respective recess. Each seal member has one sealing face which engages an inner circumferential wall of the housing and another sealing face which engages an outer surface of one of the associated sealing element and bearing, which outer surface extends circumferentially of the axis of rotation of the gears.

Abstract: A rotary hydraulic pump or motor has a pair of ports and a pair of meshed toothed gear elements each of which is journalled in a pair of bearing blocks. One block in each pair is fixed within a housing and the other block in each pair is slidable in the housing so that the axial faces of the gear teeth can be engaged by the axial end faces of associated blocks. The fluid pressure at the high pressure port is applied to the end faces of the sliding blocks remote from the gear elements, so that the sliding blocks are urged towards the fixed blocks.