Abstract: A variable displacement gear pump comprises a fixed gear, a movable gear movable, a fixed gear ring fitted over the movable gear, a movable gear ring fitted over the fixed gear, a fixed cover having a hole in which the fixed gear ring rotates, a movable cover having a hole in which the movable gear ring rotates, a fixed gear block attached to the fixed cover, and a movable gear block attached to the movable cover. The fixed gear is engaged with the movable gear. The movable gear ring rotates in the hole of the movable cover, and the fixed gear ring rotates in the hole of the fixed cover. The movable gear, together with the movable cover, the movable gear, and the movable gear block, move along the direction of the shaft to change a width in which the fixed gear is engaged with the movable gear.

Abstract: An inner gear includes: sliding surface parts that are provided annularly at an outer peripheral part including a plurality of outer teeth on both sides of the inner gear in its axial direction and that slide on a pump housing; recessed parts that are respectively provided radially inward of the sliding surface parts to respectively form fuel chambers, into which fuel flows, between the recessed parts and the pump housing; and a communication hole that communicates between the recessed parts. The inner gear further includes an inclined surface part that is provided at an edge portion of a communicating edge portion on a rotation advance side of the inner gear, to avoid an adjacent part adjacent to an inner peripheral edge portion of each of the sliding surface parts and that is inclined further toward a rear side in a direction to a central part of the communication hole.

Abstract: An external gear machine (EGM) includes a housing, an inlet, a drive gear positioned in the housing and configured to be (i) driven by a mechanism when the EGM is operated as a pump, or (ii) drive an external mechanism when the EGM is operated as a motor, the drive gear having a plurality of teeth, a slave gear positioned in the housing having a plurality of teeth and configured to be driven by the drive gear, an outlet formed in the housing and configured to receive at least some of the volume of fluid via an outlet fluid communication channel, a first slider defining an inlet fluid communication channel and the outlet fluid communication channel, selective positioning of the first slider configured to vary net operational volumes of fluid communication between the inlet and the outlet, for a given rotational speed of the drive gear.

Abstract: A pump for an engine includes a suction chamber, a discharge chamber, and a piston at least partly received within a relief chamber. The piston has first and second passageways provided therein. The second passageway is located closer to a face of the piston than the first passageway. The piston is movable within the relief chamber, so that the volume of the fluid transfer from the suction chamber to the discharge chamber is varied according to a pressure in the relief chamber. The first and second passageways form fluid paths between the suction chamber and the discharge chamber at a first and second pressure in the relief chamber, respectively, the first pressure being less than the second pressure.

Abstract: A supercharged internal combustion engine has a supercharger operable to selectively supply a mass of air from below through above atmospheric air pressure according to the operating requirements of the engine. The supercharger has a shuttle combined with a throttle valve that controls the mass of air directed to an air mass bypass opening and supplied to the internal combustion engine. The shuttle has rollers that ride on rails that allow the shuttle to move to open and close the air mass bypass opening in communication with a casing that directs a mass of atmospheric air and a bypass mass of air interfused with the mass of atmospheric air to an air mass inlet of the supercharger.

Abstract: A continuously variable transmission essentially composed by a disc with a variable inclination articulated by an automatic servo-mechanism positioned in a driver axis is described. The inclined disc system activates a pivot using two opposed bearings fixed in the pivot. The pivot activates two alternative rods. A force transmitted by the rods is applied to a balancer, with a turn radius originating in the center line of a transversal axis positioned in the center of the transmission. One side of the transversal axis is installed in the interior of a semi-axis and transmits continuous rotation in only one direction using a sprag bearing. In the internal side of the set, there are external conical helical gears integral to the semi-axis. The exit-axis is an axis of a sprocket, positioned symmetrically between both gears, having a center line axial to the entrance axis of the transmission.

Abstract: The invention has: a housing; a pump section formed of a drive gear unit and a driven gear unit; a main flow channel through which oil pressure is applied to the driven gear unit in a discharge volume reduction direction; a first branching flow channel through which oil pressure that assists oil pressure from the main flow channel is applied; a second branching flow channel through which oil pressure is applied to the driven gear unit in a discharge increase direction; a first flow channel control section; a second flow channel control section; and a spring that elastically urges the driven gear unit in a discharge increase direction. The first flow channel control section and the second flow channel control section can perform switching control in accordance with each increase or decrease of engine revolutions and in pressure.

Abstract: A rotary pump having a variable delivery volume, including: a casing; a delivery chamber formed in the casing; at least one delivery rotor which is rotatable in the delivery chamber; an actuating member which is arranged facing a front face of the delivery rotor or surrounds the delivery rotor, and is moveable in the casing for adjusting the delivery volume; the actuating member chargeable with an actuating force which is dependent on a fluid requirement; a track which is formed in the casing and guides the actuating member on an actuating member sliding surface in a sliding contact; and a sliding material which forms at least one of the track and the actuating member sliding surface.

Abstract: An air compression device is applied in an air compressor, and mainly includes a first rotor, a second rotor, a stop disk, a transmission element and a drive element. When external air enters an air chamber in the air compression device, the air is rotated and compressed by the first rotor and the second rotor, and then is exhausted, the transmission element generates axial displacement vertically according to actual requirements on air admission or exhaust, and drives the drive element and the first rotor to displace, so as to change a capacity of the air chamber, and adjust the air output.

Abstract: A pumping apparatus includes a pump housing, a pumping member which is rotatable in the housing to pump fluid, the pumping member being provided on a support which is in use, driven, the housing including in communication with an inlet, a lower pressure region, and in communication with an outlet, a higher pressure region, there being a passage for fluid from the higher pressure region to the lower pressure region through the support when the fluid pressure in the higher pressure region exceeds a threshold value.

Abstract: The oil pump includes a pump housing in which a second partitioning section is formed between a trailing end section of a discharge port and a leading end section of an intake port. The width dimension of the second partitioning section is the same as or slightly larger than the formation range of a space between teeth which is constituted by an inner rotor and an outer rotor passing the second partitioning section during low-speed rotation. A protruding surface section is formed in the same plane as and continuously with the second partitioning section from the vicinity of an inner diameter side of the trailing end section of the discharge port. The protruding surface section and the second partitioning section are the same as or slightly larger than the formation range of the space between teeth which passes the protruding surface section and the second partitioning section during high-speed rotation.

Abstract: In a capacity-adjustable screw compressor unit, a thrust force caused by a reaction force of gas can be appropriately cancelled by a balance piston. A screw compressor unit of the present invention includes a compressor, having a pair of male and female screw rotors meshing with each other contained in a casing, for compressing sucked gas and discharging it, a balance piston for pressing a rotor shaft acting as a rotating shaft of at least one of the screw rotors in an axial direction by a fluid pressure, a slide valve for adjusting capacity of the compressor, and a balance piston control device for adjusting pressure of a fluid applied on the balance piston according to the capacity of the compressor calculated from a position of the slide valve.

Abstract: An internal gear fluidic machine, in particular a pump for the lubrication circuit of a motor vehicle engine, comprises an operating part including an external gear (2) and an internal gear (4), which is housed within an axial cavity (25) of the external gear (2) and meshes with the latter. The external gear (2) is associated with a translating mechanism (8, 22), arranged to cause an axial sliding thereof relative to the internal gear (4) in order to vary the capacity and the fluid flow rate of the machine. The translating mechanism (8, 22) defines a first capacity, adjustment space (24) in communication with a high pressure chamber (48) of the machine, and a second capacity adjustment space (15) where pressure conditions exist that are dependent on the operating conditions of an element, different from the high pressure chamber (48), of a fluidic circuit in which the machine (1) is connected.

Abstract: An oil pump includes a drive gear, which rotates with a drive shaft, a driven gear, which meshes with the drive gear and is supported rotatable on a driven shaft, and a casing having a pump chamber, which accommodates the drive gear and the driven gear. The casing of the gear pump is provided with an intake port and a discharge port, which are in fluid communication with the pump chamber, so that oil is sucked through the intake port and discharged through the discharge port. A gear holder is provided in the casing such that the gear holder supports the driven gear rotatable and holds both sides of the driven gear while the gear holder itself is being supported axially movable by the driven shaft. The gear holder holding the driven gear moves axially by receiving a biasing force and also a pressing force acting against the biasing force.

Abstract: A rotor assembly for a multi-stage pump is provided. The assembly includes a drive shaft, a rotor component and a drive component. The rotor component is located on the drive shaft and includes a rotor element for displacing fluid through the pump when the drive shaft is rotated. The drive component is anchored to the drive shaft and transmits torque from the drive shaft to the rotor component to effect rotation of the rotor component. A sleeve element is integrated with either the drive component or the rotor component and is used to space the rotor element from the drive component. An interface surface is located on the sleeve element for interacting with the other one of the drive component and the rotor component in order to maintain orthogonal alignment between the rotor element and the drive shaft. A driver is provided for transmitting torque between the drive component and the rotor component.

Abstract: A telescoping gear pump comprises a bolt, a Bellville washer, a wear plate, a seal housing, a seal spring, a spur gear including a wear lobe, a seal ring and a case drain path, a shaft, a ring gear including a wear lobe, seal ring, and a case drain path, seal, a bolt assembly including a Bellville washer and bolt, and a pressure plate. The assembly provides pressure to a fluid to maintain a seal within a telescoping pump/motor during operation. The wear lobe reduces wear while maintaining fluid pressure.

Abstract: A rotary pump having a variable delivery volume, comprising: a casing; a delivery chamber formed in the casing; at least one delivery rotor which is rotatable in the delivery chamber; an actuating member which is arranged facing a front face of the delivery rotor or surrounds the delivery rotor, and is moveable in the casing for adjusting the delivery volume; the actuating member chargeable with an actuating force which is dependent on a fluid requirement; a track which is formed in the casing and guides the actuating member on an actuating member sliding surface in a sliding contact; and a sliding material which forms at least one of the track and the actuating member sliding surface.

Abstract: An internal gear fluidic machine, in particular a pump for the lubrication circuit of a motor vehicle engine, comprises an operating part including an external gear (2) and an internal gear (4), which is housed within an axial cavity (25) of the external gear (2) and meshes with the latter. The external gear (2) is associated with a translating mechanism (8, 22), arranged to cause an axial sliding thereof relative to the internal gear (4) in order to vary the capacity and the fluid flow rate of the machine. The translating mechanism (8, 22) defines a first capacity, adjustment space (24) in communication with a high pressure chamber (48) of the machine, and a second capacity adjustment space (15) where pressure conditions exist that are dependent on the operating conditions of an element, different from the high pressure chamber (48), of a fluidic circuit in which the machine (1) is connected.

Abstract: An air compression device is applied in an air compressor, and mainly includes a first rotor, a second rotor, a stop disk, a transmission element and a drive element. When external air enters an air chamber in the air compression device, the air is rotated and compressed by the first rotor and the second rotor, and then is exhausted, the transmission element generates axial displacement vertically according to actual requirements on air admission or exhaust, and drives the drive element and the first rotor to displace, so as to change a capacity of the air chamber, and adjust the air output.

Abstract: A rotary pump having a variable delivery volume, comprising: a casing; a delivery chamber formed in the casing; at least one delivery rotor which is rotatable in the delivery chamber; an actuating member which is arranged facing a front face of the delivery rotor or surrounds the delivery rotor, and is moveable in the casing for adjusting the delivery volume; the actuating member chargeable with an actuating force which is dependent on a fluid requirement; a track which is formed in the casing and guides the actuating member on an actuating member sliding surface in a sliding contact; and a sliding material which forms at least one of the track and the actuating member sliding surface.

Abstract: An oil pump for an internal combustion engine for drawing up the lubricating oil situated in an oil collector device has an oil pump housing wherein at least two pairs of gears are disposed. The pairs of gears, in order to form the pumping stages, are connected on the suction side to a suction passage formed in the oil pump housing and on the delivery side to a delivery passage. The oil pump housing is further formed with an oil supply passage that is connected to the suction passage of a first pumping stage and via which lubricating oil can be delivered to the suction side of the first pumping stage.

Abstract: A variable capacity gerotor pump includes an inner rotor that is axially displaceable with respect to the outer rotor to vary the volumetric capacity of the pump. An active piston abuts the lower surface of the inner rotor and can ride inside the outer rotor, as the inner rotor is axially displaced, to provide the necessary scaling of the lower surface of the inner rotor with respect to the outer rotor. A passive piston, against which a return spring acts, abuts the upper surface of the inner rotor to provide the necessary sealing of the upper surface of the inner rotor with respect to the outer rotor. In an embodiment, a control chamber, supplied with pressurized working fluid, generates a force acting against the force of the return spring to move the inner rotor to reduce the volumetric capacity of the pump. In another embodiment, a control mechanism, such as an electric solenoid or mechanical mechanism, acts on the control piston against the force of the return spring.

Abstract: A media delivery assembly in which a defined compensating pressure is established at the backs of included axially adjustable rotors and a control valve is provided for establishing the compensating pressure at a predetermined value between a pressure on the pressure side and a pressure on the suction side.

Abstract: A casing with housing space for retaining a first gear and a second gear in a condition where the tooth tips and both side surfaces slide, comprises a main casing which retains the first gear in a manner which allows rotation but restricts movement in the axial direction, and a gear holder which can move in the rotating shaft direction in the main casing and which rotatably retains the second gear. The main casing contains a biasing member which applies a biasing force to bias the gear holder to one side in the rotating shaft direction, and a piston which is acted on by hydraulic pressure and presses the gear holder on the other end side in the rotating shaft direction to counteract the biasing force. The gear holder is acted on by the hydraulic force from the piston to counteract the bias from the biasing member and moves in the rotating shaft direction according to the hydraulic force so that the engagement width between the first gear and the second gear which is retained by the gear holder is changed.

Abstract: An oil pump includes a drive gear, which rotates with a drive shaft, a driven gear, which meshes with the drive gear and is supported rotatable on a driven shaft, and a casing having a pump chamber, which accommodates the drive gear and the driven gear. The casing of the gear pump is provided with an intake port and a discharge port, which are in fluid communication with the pump chamber, so that oil is sucked through the intake port and discharged through the discharge port. A gear holder is provided in the casing such that the gear holder supports the driven gear rotatable and holds both sides of the driven gear while the gear holder itself is being supported axially movable by the driven shaft. The gear holder holding the driven gear moves axially by receiving a biasing force and also a pressing force acting against the biasing force.

Abstract: Rotary seals in a telescoping gear pump/motor a feature that allows the seal to shift radially relative to other components while maintaining the seal integrity and without compromising the function of the bearings or the bushings needed to bear the load.

Abstract: A pump is formed by a housing (10) having an inlet (11) for connection to a source of fluid and an outlet (12) for pumped fluid. A rotor (15) is rotatable within the housing and the inlet (11) and the outlet (12) are spaced apart around the path of the rotor (15) in the housing. The rotor (15) has surfaces (16a, 16b, 16c, 16d) that form, with the housing (10), closed chambers (18a, 18b, 18c, 18d) which travel around the housing (10) to convey fluid from the inlet (11) to the outlet (12). The housing (10) carries a seal (14) that is located between the inlet (11) and the outlet (12) in the direction of travel of the rotor (15). The seal (14) co-operates with the rotor surfaces (16a, 16b, 16c, 16d) as the surfaces (16a, 16b, 16c, 16d) pass between the outlet (12) and the inlet (11) to prevent the formation of a chamber during said passage and so prevent fluid flow from the outlet (12) to the inlet (11). Such a pump is easily and cheaply produced and is particularly useful in medical applications.

Abstract: An external toothed wheel pump, comprising a delivery chamber comprising an inlet and an outlet for a fluid; a first feed wheel and a second feed wheel which can be rotationally driven for delivering the fluid and are in a toothed engagement with each other which separates the outlet from the inlet; and sealing surfaces which axially face the feed wheels and form axial sealing gaps with the feed wheels, wherein at least one of the sealing surfaces comprises a relieving pocket on a high-pressure side of the delivery chamber only and except for the relieving pocket, extends circumferentially up to at least the root circle and tip circle of the axially facing feed wheel.

Abstract: A variable capacity pump/motor has a meshing internal and external gear set disposed between an upper mandrel and a lower mandrel, each including a flange extending towards the gears to divide a pump/motor chamber into suction and discharge chambers. The inner gear is fixed and the external gear is axially moveable with respect thereto. The external gear and the upper mandrel move in response to changing pressures in the casing, allowing the motor to vary displacement and the pump to vary its output based on supplied fluid pressure or based on the speed of the prime mover. An external configuration includes a pair of meshing gears mounted on separate shafts in a casing. One gear is fixed and the other is axially moveable with respect thereto and moves in response to changing pressures in the casing. Each of the gears is sealed by a seal/bushing on a free end thereof.

Abstract: An oil pump for an internal combustion engine for drawing up the lubricating oil situated in an oil collector device has an oil pump housing wherein at least two pairs of gears are disposed. The pairs of gears, in order to form the pumping stages, are connected on the suction side to a suction passage formed in the oil pump housing and on the delivery side to a delivery passage. The oil pump housing is further formed with an oil supply passage that is connected to the suction passage of a first pumping stage and via which lubricating oil can be delivered to the suction side of the first pumping stage.

Abstract: A fluidic machine has a fixed body, an external orbital member rotatable around a first rotational axis and internal gear teeth including a first teeth number, a transmission member rotatable around a second rotational axis, an internal orbital member supported by the transmission member, having external gear teeth including a second teeth number different from the first teeth number and meshing with the internal gear teeth of the external orbital member, thus determining among the gear teeth of the two orbital members spaces whose volume is variable during rotation. One of the orbital members is mounted axially displaceable and is pushed by an elastic push member in the direction producing a more extended engagement with the other orbital member, and a piston, mounted displaceable within the non-axially displaceable orbital member and resting against the axially displaceable orbital member, is subjected, to the pressure of the high pressure connection.

Abstract: A variable capacity pump/motor has a meshing internal and external gear set disposed between an upper mandrel and a lower mandrel, each including a flange extending towards the gears to divide a pump/motor chamber into suction and discharge chambers. The outer gear is fixed and the internal gear is axially moveable with respect thereto. The inner gear and the upper mandrel move in response to changing pressures in the casing, allowing the motor to vary displacement and the pump to vary its output based on supplied fluid pressure or based on the speed of the prime mover. An external configuration includes a pair of meshing gears mounted on separate shafts in a casing. One gear is fixed and the other is axially moveable with respect thereto and moves in response to changing pressures in the casing. Each of the gears is sealed by a seal/bushing on a free end thereof.

Abstract: In a gear pump with variable throughput volume, with two meshed gears with external toothing which are rotatably held in the working chamber of a pump housing, at least one of the two gears is driven from a drive shaft and one of the gears, preferably the driven gear, is shiftable in the direction of its axis. In order to realize a control mechanism in a simple manner a gap width defined as the distance measured in axial direction between an essentially plane first interior side wall of the working chamber of the pump housing and a first front face of the shiftable gear, is designed to be variable.

Abstract: A torque control crescent oil pump, having low parasitic loss and rapid pressure transient response, and a method for controlling oil flow within the pump, are provided. In one embodiment, the crescent oil pump comprises a housing, toothed annular gears cooperatively rotating about preferably offset first and second axes, and a crescent body. The crescent body is adapted to move from a first position to a second position. In the first position, the crescent body is adapted to form a seal between the annular gears. In the second position, the crescent body is positioned so that it does not form a seal between the annular gears. In another embodiment, an actuating device moves the crescent body from the first position to the second position.

Abstract: An improved hydraulic motor system, suitable for driving an automotive cooling fan or the like. The system is driven by grade gerotor set and an idle gerotor set which are stacked between a center plate and against a rear wall of a cylindrical cavity in a front face of a manifold. A fluid-tight chamber is established by securing an end frame can around the stacked gerotor sets and against the perimeter of the manifold cavity. Tightness of the seal is controlled by positioning a resilient cover plate against the end frame can from a position opposite the manifold, and adjustably clamping the resilient cover against the manifold until the resilient cover has undergone a predetermined amount of elastic deformation.

Abstract: A variable displacement hydraulic gear pump has a housing having fluid inlet and fluid outlet ports; and first and second gears rotatable in the housing. The first gear and the second gear are positioned in gear tooth engagement for at least a portion of the axial length of each. At least one of the first gear and the second gear is axially moveable, to vary the axial length of gear tooth engagement.

Abstract: A positive displacement fluid pump capable of an output flow rate can be varied from a maximum to zero at a given pump rotation speed. The pump is a variable-fluid-displacement-volume, gear pump having complement elements associated with pumping gears to provide end seals for a variable-length pumping chamber. A timing arrangement maintains both pumping gears always in synchronization, whether engaged or fully disengaged (zero pump output). And a follower provides effective sealing with a movable face of an axially-translating pumping gear.

Abstract: A variable-delivery external gear pump comprising a casing, at least one rotatively driven pair of gears comprising two intermeshing spur gears, which form with shell surface areas of the casing and axial sealing surface areas a delivery space comprising a low-pressure side connected to a pump inlet port and a high-pressure side connected to a pump outlet port, and a piston, serving to rotatively mount one spur gear of the pair of gears, said piston being shifted relative to the other spur gear of the pair of gears so as to vary the delivery of the pump together with the one spur gear by charging the high-pressure side with fluid against the force of a return element, wherein formed in at least one axial sealing surface area adjoining a sealing land of the sealing surface area is at least one pocket connecting a zone of deepest tooth engagement of the spur gears to either the pump outlet port or the pump inlet port.

Abstract: The pump has a fixed gear axis eccentricity and varies displacement by moving controlling elements linearly along the drive shaft. A pressure compensator may be employed to displace the controlling elements. The pump includes a housing penetrated by a drive shaft rotating internal elements. The internal components slide along the longitudinal axis established by the drive shaft to vary the fluid displacement of the pump. The axially-moving elements include the drive shaft, inner gerotor element, port plug, thrust bearing and retainer sleeve. The drive shaft includes an internal flanged forming a piston. The outward face of the piston is in contact with fluid at system pressure. The internal gerotor element and port plug are retained against the piston by a thrust bearing that slides over the drive shaft and is held in place by a retainer sleeve. The port plug has a rear face that also functions as a piston and this face is the same size as the flanged piston.

Abstract: A compressor with rotor unloading is presented. The compressor having a housing for supporting a multi-rotor configuration (e.g., a male rotor and two axially aligned female rotors) and a drive motor. A discharge disk is mounted at the discharge end of the male rotor. The length of the male rotor is slightly longer than the length of the female rotors, thereby providing axial clearance between the female rotors and the discharge disk. Lubrication is leaked (or flashed) through these clearances to upper bearings. The motor is supported in the compressor housing. Evaporated refrigerant from the evaporator is inducted into the compressor. The vapor phase refrigerant is compressed by the compressor. The compressed vapor phase refrigerant is then presented to a condenser, condensing the refrigerant to the liquid phase. Thereafter, liquid phase refrigerant is delivered through an expansion valve to the evaporator.

Abstract: A variable displacement apparatus includes a pair of axially adjustable housing parts sealingly joined together to form a unitary pumping chamber. A pair of meshing elongated vanes or gears having a plurality of teeth disposed within the chamber in a meshing overlapping relationship for positive displacement pumping purposes. The gears are mounted adjustably within the chamber to move axially therein as the housing parts are adjusted axially relative to one another.

Abstract: Gear pump or motor to deliver fluid medium or use fluid medium as power source, respectively. The pump or motor has at least two gears contained within a housing. At least one gear is in a fixed position while the other gear is in slidable engagement with the fixed gear. In the pump configuration, fluid is introduced into the housing on one side of the engaged gears and is drawn through decreasingly wide passages by the rotating gears. The fluid thereby passes to the other side of the gears and exits the pump at a greater pressure. A control medium is used to control the position of the slidable gear. The greater the overlap between the gears the greater the volume of pumped fluid.

Abstract: This invention describes an integrated hydro-mechanical transmission having continuous, through zero, variability from maximum forward to maximum reverse and is intended for use in passenger cars and lighter-duty trucks. The integrated hydro-mechanical transmission is capable of achieving high levels of efficiency and lower product cost. The unit is hydrostatically based and is automatically responsive to ratio upshifting as engine speed increases and to downshifting in response to applied load. In addition, the unit is responsive to operator selected inputs for ratio change to accommodate either temporary or extended heavy-load situations.

Abstract: A fluid pump is arranged to employ cooperating gears that are arranged for axial displacement relative to one another, whereupon a volumetric chamber positioned between a surrounding housing and one of a plurality of inter-nesting first and second cylindrical housings permits displacement of the first and second cylindrical housings towards one another that in turn effects axial displacement of the gears relative to one another to control inter-engagement and associated volumetric displacement relative to the gear structure.

Abstract: An integrated hydromechanical transmission capable of achieving continuous variability from maximum forward, through zero, to full reverse, and vice versa. The unit will achieve significantly higher rates of efficiency than current hydrostatic transmissions and, as well, has many other desirable characteristics. Intended for use in heavy-duty drive-wheel-steered and tracked vehicle applications such as hay windrowers, grain swathers, crawler tractors, military armoured vehicles, etc.

Abstract: A fully variable output hydraulic pump includes a main casing having a fluid pumping chamber extending therethrough, fluid input ports and fluid output ports. The fluid pumping chamber is shaped to receive a pair of cylindrically shaped gears inserted axially therethrough. A first rotatable gear and second rotatable gear are insertable through the pumping chamber. The first and second gears are rotatably supported by respective means which are axially translatable relative to each other. A means for sealing the area between the gears and the main casing effectively creates a sealed fluid pumping chamber. By translating one of said means for rotatably supporting the gears, the effective fluid pumping volume within the fluid pumping chamber may be altered to provide a fully variable output hydraulic pump.

Abstract: By using multiple external gears and internal gears, which are engaged with each other, and multiple radial sealing elements and axial sealing elements, a pump or motor, which includes multiple equivalent pumps or motors, is made. Each gear included in thus made gear pump or motor is radially hydraulically counterbalanced, even completely hydro-mechanically counterbalanced, loads on bearings being able to become zero. Axial gaps and radial gaps both have been compensated. The pump or motor can stagelessly vary its output. Accordingly, a gear pump or motor with constant output or stagelessly variable output, as well as a relevant stageless hydraulic speed variator, can be made, which will have lower production cost, higher transmission efficiency and higher power density.

Abstract: An axial variable capacity rotary pump which yields a stepless change of capacity. The pump has a casing with an inlet and outlet, at least one rotary member with engaging elements mounted on the periphery of the rotary member for engaging a mating member, and a pair of axial sealing element which seal either axial side of the rotary member. One sealing element moves together with the rotary member axially to change a length of a sealed working chamber between the members, thereby changing the delivery capacity per revolution of the pump.

Abstract: An axial variable capacity rotary pump which yields a stepless change of capacity. The pump has a casing with an inlet and outlet, at least one rotary member with engaging elements mounted on the periphery of the rotary member for engaging a mating member, and a pair of axial sealing element which seal either axial side of the rotary member. One sealing element moves together with the rotary member axially to change a length of a sealed working chamber between the members, thereby changing the delivery capacity per revolution of the pump.

Abstract: A pump is formed by a housing (10) having an inlet (11) for connection to a source of fluid and an outlet (12) for pumped fluid. A rotor (15) is rotatable within the housing and the inlet (11) and the outlet (12) are spaced apart around the path of the rotor (15) in the housing. The rotor (15) has surfaces (16a, 16b, 16c, 16d) that form, with the housing (10), closed chambers (18a, 18b, 18c, 18d) which travel around the housing (10) to convey fluid from the inlet (11) to the outlet (12). The housing (10) carries a seal (14) that is located between the inlet (11) and the outlet (12) in the direction of travel of the rotor (15). The seal (14) co-operates with the rotor surfaces (16a, 16b, 16c, 16d) as the surfaces (16a, 16b, 16c, 16d) pass between the outlet (12) and the inlet (11) to prevent the formation of a chamber during said passage and so prevent fluid flow from the outlet (12) to the inlet (11). Such a pump is easily and cheaply produced and is particularly useful in medical applications.