Abstract: An internal meshing type gear device includes: an internal gear; and an external gear that meshes with the internal gear, in which, when a straight line passing through an external gear center and an internal gear center is defined as a gear center line, a pitch point between the external gear and the internal gear is positioned radially inside an external tooth tip circle and an internal tooth tip circle, an intersection point between a normal line to a contact point locus between the external gear and the internal gear and the gear center line is positioned between the pitch point and the external gear center, and the contact point locus is positioned in a meshing region between the external and internal tooth tip circles within an angle range in which an angle centered on the pitch point from the gear center line is 0 to ?/2 [rad].

Abstract: A hydraulic machine (1) has a working section (6) and a fluid control section (28). The fluid control section includes a spool (3) that is rotatable in a cylindrical bore (30) about an axis (4). A distributor plate (18) extends intermediate of the control section and the working section. The spool includes an axial recess (10) which is axially bounded by a radially extending annular wall (44). A front face (48) of the annular wall rotates in abutting engagement with a plate face contact area (50) of the distributor plate. Hydraulic fluid flows through at least one groove (52) that extends radially and circumferentially across the abutting areas of the spool and the distributor plate to provide lubrication and heat absorption.

Abstract: This pump comprises: a housing; a second cover coupled to the housing; a stator disposed inside the housing; a pump gear disposed so as to correspond to the stator; and magnets disposed on the pump gear, wherein the pump gear comprises a first guide part protruding towards the second cover, and the second cover comprises a guide groove into which the first guide part is inserted.

Abstract: An electric oil pump includes a motor including a motor shaft, a pump assembly including a vane pump driven by the motor to suction and discharge oil, and an inverter to drive the motor. The motor includes a rotor, a stator on a side outward from the rotor in a radial direction, and a motor housing containing the rotor and the stator. The motor housing includes a suction port through which the vane pump suctions oil from outside, and a discharge port through which the vane pump discharges oil to outside. The motor housing includes flat surface portions in a portion of an outer periphery thereof. The suction port and the discharge port are located in a first surface of side surfaces which are the flat surface portions of the motor housing and are parallel or substantially parallel to the axial direction.

Abstract: The present invention provides a controller for a hydraulic apparatus. The controller is configured to determine (410) that a mode change criteria has been met for the hydraulic apparatus. In response to the determination, the controller is configured to control (420) a valve arrangement to change a first actuator chamber of a hydraulic actuator between being fluidly connected to a hydraulic machine and fluidly isolated from a second chamber of the hydraulic actuator, and being fluidly connected to both the second actuator chamber and the hydraulic machine. Further in response to the determination, the controller is configured to control (430) the hydraulic machine to change a flow rate of hydraulic fluid flowing through the hydraulic machine to regulate a movement of the hydraulic actuator during the control of the valve arrangement.

Abstract: The utility model relates to internal cycloidal gear mechanisms and can be used in various branches of mechanical engineering as working members of hydraulic machines (pumps and engines), compressors, internal combustion engines, as well as in planetary gearboxes, in particular in technical systems for drilling and repairing oil and gas wells. The problems to be solved by the utility model include the improvement of the quality of the process of designing working members having a cycloidal tooth profile, as well as the substantiation of the conditions for modifying cycloidal face profiles (by choosing the required combination of dimensionless gearing coefficients) in order to achieve the maximum or minimum open area of the gerotor mechanism having a different kinematic ratio.

Abstract: Magnets and systems, methods, and techniques for manufacturing magnets are provided. In some embodiments, methods of manufacturing magnets comprise providing a rare earth magnetic body, depositing a bead of dysprosium or terbium metal onto a part of the magnetic body to form a magnet; and heat-treating the magnet. In some embodiments, a magnet is provided comprising a magnetic body and a bead of dysprosium or terbium metal. In some embodiments, the magnetic body contains grains of rare earth magnet alloy, and the bead of dysprosium or terbium metal is deposited onto a part only of a surface of the magnetic body.

Abstract: An actuator for a thrust reverser includes a ball screw, a ball nut coupled to the ball screw, and a gerotor coupled to the ball screw. The gerotor includes an inner rotor coupled to the ball screw and an outer rotor. The outer rotor includes a plurality of bores. The actuator includes a lock system coupled to the outer rotor. The lock system is to enable the gerotor to rotate the ball screw in an unlocked state and to inhibit a rotation of the ball screw in a lock state. The lock system includes a piston coupled to a piston housing and a grippable member coupled to the piston housing. The piston is received in one of the bores in the lock state, and the grippable member is to move the piston housing relative to the gerotor to move the lock system to the unlocked state.

Abstract: A split power gerotor pump includes a rotational axis, a shaft, an inner gerotor, an eccentric pocket, and an outer gerotor. The inner gerotor is rotationally fixed on the shaft, rotatable about the rotational axis, and includes n first lobes. The eccentric pocket is rotatable about the rotational axis, and includes a cylindrical bore with a center radially offset from the rotational axis and an outer surface, disposed radially outside of the cylindrical bore and arranged for direct engagement with a gear or a rotor for an electric motor. The outer gerotor includes a cylindrical outer surface installed in the cylindrical bore and n+1 second lobes.

Abstract: A speed reducer comprises a transmission shaft, an eccentric wheel, a first wheel assembly, a rotating wheel and a second wheel assembly. The first wheel assembly comprises a first wheel disc and at least one first roller. The at least one first roller is disposed on the inner wall of first wheel disc. The rotating wheel comprises a main body comprising an outer ring structure and a concave structure. The outer ring structure comprises at least one first tooth. The at least one first tooth is in contact with the corresponding first roller. At least one second roller is disposed within the concave structure. The second wheel assembly comprises a second wheel disc and at least one second tooth. The at least one second tooth is disposed on an outer periphery of the second wheel assembly. The at least one second tooth is in contact with the corresponding second roller.

Abstract: A gerotor pump includes an inner gerotor, a wobble cancellation element, and an outer gerotor disposed radially between the inner gerotor and the wobble cancellation element. The inner gerotor includes a first outer peripheral surface with n first lobes equally spaced from one another in a circumferential direction, and n first depressions, each disposed between an adjacent pair of first lobes. The inner gerotor and the wobble cancellation element are coaxial. The wobble cancellation element includes a first inner peripheral surface with n+1 second lobes equally spaced from one another in the circumferential direction, and n+1 arcuate surfaces, each arranged between an adjacent pair of second lobes. The outer gerotor includes a second outer peripheral surface including n+1 outer depressions complementary to and arranged to engage the second lobes, and a second inner peripheral surface comprising n+1 inner depressions complementary to and arranged to engage the first lobes.

Abstract: A full-metal anti-high temperature cycloid downhole motor comprises an outer tube, a stator, a rotor, a partition plate, a flow distribution disc, and a flow guide mechanism. The inside of the stator is provided with N grooves, the inner side walls of the N grooves form an annular inner contour surface; the rotor is formed with N?1 rotating heads provided along the axial direction of the outer tube, and each rotating head is provided with an embedding slot, one side of the embedding slot is provided with a notch, a rotor copper rod that can be in rolling engagement with the inner contour surface through the notch is provided in the embedding slot, and there is a changing gap between the outer wall of the rotor copper rod and the inner wall of the embedding slot.

Abstract: An electric oil pump apparatus includes a housing, an electric motor, an oil pump, a shaft, a first bearing, and a second bearing. The electric motor is housed in the housing. The oil pump is provided in the housing and positioned on a first side in an axial direction with respect to the electric motor so as to be adjacent to the electric motor, and includes a pump rotational element rotatable coaxially with a motor rotor. The motor rotor and the pump rotational element are fitted to the shaft to be rotatable together with the shaft. The first bearing is disposed on the first side with respect to the pump rotational element, and supports the shaft while allowing rotation relative to the housing. The second bearing is disposed on a second side with respect to the pump rotational element, and supports the shaft while allowing rotation relative to the housing.

Abstract: A fluid pumping system for a vehicle having an internal combustion engine comprises a housing, an electric motor, a rotatable first input adapted to be driven by the internal combustion engine, a rotatable second input driven by the electric motor, and a pump. The pump includes a drum selectively rotated about a drum axis of rotation by one of the first input and the second input, and a pump rotor selectively rotated by the other of the first input and the second input. The drum includes a cam ring having a cavity in receipt of the pump rotor. The drum includes a first fluid inlet port and a second fluid inlet port on opposite sides of the drum such that fluid entering the cavity through the first and second fluid ports flows axially in a direction parallel to the drum axis of rotation. The drum includes a radially extending outlet port such that pumped fluid flows radially out of the cavity. The housing contains the electric motor and the pump.

Abstract: The object is to provide an actuator that consumes less power. An actuator comprises: a stator that rotatably supports a plurality of stator rollers; a mover that rotatably supports a mover roller disposed between the stator rollers; and a wire made of a shape memory alloy that is disposed between the stator rollers and the mover roller and has both ends connected to respective two stator terminals provided in the stator.

Abstract: A rotary fluid pressure device, such as a low-speed, high-torque gerotor motor, is provided with a valve drive shaft that is partially inserted into and engaged with a main drive shaft as the main drive shaft engages a rotating output shaft and engages a rotating and orbiting star member of a positive displacement device. The device is also provided with a drive retainer configured to retain the engagement of the main drive shaft and the valve drive shaft.

Abstract: An active suspension system is configured in a strut arrangement. The active suspension system comprises a hydraulic actuator and a hydraulic pump/electric motor assembly, wherein the actuator movement is preferably in lockstep with the hydraulic motor-pump and electric motor-generator combination. Torque in the electric motor is instantaneously controlled by a controller to create an immediate force change on the hydraulic actuator. The hydraulic actuator is configured so that it can be used as a strut whereby the actuator has sufficient structural rigidity to carry the applied suspension loads while capable of supplying damper forces in at least three quadrants of the force velocity graph of the suspension actuator operation. Embodiments disclosed include low cost active suspension systems for a MacPherson strut application.

Abstract: An eccentric oscillating speed reducer includes an input rotor, a first rotor, a second rotor, a planetary rotor, a flow passage, a contact portion and a radial relief groove. The flow passage includes an axial gap located between the planetary rotor and a contact member. The flow passage conducts a lubricant oil that is forced to flow by a centrifugal force. The contact portion is placed in a drive force transmission path from the planetary rotor to the second rotor. The contact portion includes: a planetary rotor end surface of the planetary rotor located on a side where the second rotor is placed; and a second rotor end surface of the second rotor, which is opposed to the planetary rotor end surface. The radial relief groove forms a portion of the flow passage and extends through a radial width of the planetary rotor end surface.

Abstract: An electrically driven gerotor pump has a gerotor which comprises a stationary outer gerotor element with an inner toothing that is axially delimited by two chamber walls, wherein each chamber-forming foot section of the inner toothing is paired with a pressure valve which is connected to the outlet. The gerotor also comprises an inner gerotor element with an outer toothing which is guided in the outer gerotor element in a circumferential manner on an eccentric section of the shaft and is mounted in, a rotatable manner so as to mesh with the inner toothing.

Abstract: A disc valve assembly includes a disc element housed within a housing, the disc element having an inlet facing side and a second side opposite to the inlet facing side, and flow pathways configured as a plurality of different pressure zones with the flow pathways extending axially along a longitudinal axis of the disc element from at or adjacent to the inlet facing side to the second side. The valve housing that houses the disc element includes porting configured as part of the plurality of different pressure zones respectively in fluid communication with the flow pathways of the disc element. The disc element is configured to rotate to control a flow of hydraulic fluid through the disc valve assembly. The different pressure zones are isolated from each other using a plurality of annular sealing rings located on the inlet facing side of the disc element.

Abstract: Oil pump and oil pump-integrated balancer device each have a pump housing formed by housing body 31 and cover member 32, pump shaft 33 having driven side helical gear 43 at which thrust force occurs when transmitting rotation force and rotating a rotor by the rotation force provided from drive side helical gear 13 that is engaged with driven side helical gear 43, first and second thrust receiving portions 47, 46 formed close to hole edges of bearing holes 32a, 31a of the cover member and the housing body, and first and second thrust limiting portions 49, 48 provided at the driven side helical gear and the pump shaft, contacting the thrust receiving portions from axis direction and limiting thrust movement of the pump shaft. With this configuration, oil pump and oil pump-integrated balancer device which are capable of securing stable support of the pump shaft are provided.

Abstract: A patient support system comprises a patient support apparatus for patients. The patient support apparatus comprises a support structure and a patient support surface supported by the support structure. The patient support apparatus also comprises movable members. One or more rotary actuators are coupled to the movable members. The rotary actuator comprises a gear assembly with a cycloidal drive arranged to drive movement of the movable member. The gear assembly also restricts back drive torque from backdriving the movable member.

Abstract: A planetary transmission device with a small tooth number difference for implementing smart workload self-adaptation comprises a left planetary gear, a right planetary gear, a left-end disk, a right-end disk, a housing and a connection member. One end of the connection member axially run through the left planetary gear and the right planetary gear. End parts of both ends of the connection member are fixedly connected to the left-end disk and the right-end disk respectively. By means of a force closure mechanism, the transmission device can automatically and steplessly adjust a transmission ratio and an output rotation speed according to a change in load without depending on a measurement md control system, md has a simple structure and low costs.

Abstract: A pump housing includes: a slide surface, along which inner and outer gears are slid; a suction guide passage, which is recessed from the slide surface and guides the fuel at a suction side; a discharge passage, which is recessed from the slide surface-and guides the fuel at a discharge side; and a communication groove, which is recessed from the slide surface and is shaped into an arcuate form that extends along a circumcircle of the inner gear. The communication groove is communicated with the suction groove and the discharge passage through two opposite groove end parts, respectively, of the communication groove.

Abstract: A gerotor pump includes a rotor wherein only on the face wall of the rotor that lies adjacent to a pressure kidney and a suction kidney, a lubrication surface inclined in the direction of rotation of the rotor, relative to the surface plane of the face wall of the rotor, is disposed on each tooth, in each instance, over its tooth height, either starting directly in the center tooth plane or starting “offset” ahead of the center tooth plane in the direction of rotation of the rotor, which surface is formed from a level surface or multiple, always level partial surfaces that follow one another, which enclose an angle of inclination relative to the surface plane of the face wall of the rotor, in each instance, which angle lies in the range from 0.2° to 7°, in each instance.

Abstract: A hydraulic machine is provided comprising a cylinder unit (3) having a plurality of cylinders (4a, 4b) which are located on a circle line around an axis of rotation of said cylinder unit (3), a valve plate (6) located at an axial end of said cylinder unit (3) and having a through-going opening (8) for each cylinder (4a, 4b), and a port plate, said valve plate (6) and said port plate resting against each other in sliding contact at a contact face, wherein a pressure in each cylinder (4a, 4b) acts on a pressure area on a side of said valve plate (6) opposite said port plate. In such a hydraulic machine the risk of leaking should be kept small. To this end said pressure area (17) deviates from a circular form.

Abstract: A hydraulic motor includes a rotor and a stator, wherein the rotor and the stator define a plurality of motor pockets for receiving a flow of hydraulic fluid, and the rotor rotates relative to the stator based on a pressure differential between the motor pockets. A commutator having porting controls the flow of hydraulic fluid into the motor pockets. The rotor rotates about a first axis and the stator orbits about a second axis, and the stator is configured to orbit such that the second axis orbits about the first axis. The commutator is eccentrically piloted about the first axis and the second axis so that the commutator both rotates and orbits to control the flow of hydraulic fluid into the motor pockets. With such configuration, an output shaft is driven by rotation of the rotor about the first axis without orbiting, obviating the need for a drive link.

Abstract: A toothing, in particular of a drive spindle for driving a roll in rolling mills or continuous casting plants, which has several teeth and meshes with a second toothing in the manner of a spline, wherein a flank line of the teeth has a curvature, and a deflection angle is formed between the rotational axis of the second toothing and the rotational axis of the drive spindle toothing, and wherein the teeth of drive spindle toothing have a twist in form of profile angle deviation over the tooth width in the flank direction.

Abstract: A hydraulic geroller (gerotor) motor, wherein an inner rotor of a revolving group has a plurality of lobes circumferentially spaced along an outer periphery of the inner rotor, and an orbiter of the revolving group includes an orbiting ring and rounded vane portions preferably formed by roller vanes contained in inner recesses of the orbiting ring for common orbiting with the orbiting ring about the fixed longitudinal axis. The orbiter also has fixed for orbiting therewith, fluid windows for directing fluid from the fluid ports to the revolving group. The windows may be formed in an integral portion of the orbiter or in a valve plate mounted for common orbiting with the orbiting orbiter. The valve plate cooperates with a stationary commutator plate or assembly to provide an efficient arrangement for the delivery and exhaust of hydraulic pressure fluid to and from the hydraulic motor.

Abstract: An oil pump is provided. The oil pump comprises a shell, a rotor mounting part on the shell, and a rotor mechanism disposed on the rotor mounting part. The shell has an inlet and an outlet and defines a low-pressure oil chamber and a high-pressure oil chamber therein. A buffer chamber is defined between the low-pressure oil chamber and the high-pressure oil chamber, and a barrier wall is disposed between the buffer chamber and the low-pressure oil chamber. An engine cover comprising the oil pump and an engine comprising the engine cover are also provided.

Abstract: A hydraulic device (1) comprising a housing (2) and a gerotor (3) contained within the housing (2), the gerotor (3) having an inner rotor (4) eccentrically disposed within an outer ring (5), the outer ring having a central axis (19), the outer ring (5) being fixed to the housing, the inner rotor (4) having external lobes (4a) extending radially outwardly engaging the outer ring (5) having internal lobes (5a) extending radially inwardly, the inner rotor (4) being arranged for orbital and rotational movement relative the outer ring (5), wherein the orbital and rotational movement will define a plurality of expanding and contracting volume pressure chambers (7) between the inner rotor (4) and the outer ring (5).

Abstract: A device for a hydraulic wheel drive of a motor vehicle includes a wheel flange; a stub axle; and a rotary piston wheel drive configured and designed to introduce and receive a torque at the wheel flange. An active intervention of the rotary piston wheel drive is designed to be able to be switched on and decoupled. The present invention ensures that the vehicle can drive over rough tracks in the off-road sector. In addition the device can be engaged to recover braking force.

Abstract: An oil pump is provided. The oil pump comprises a shell, a rotor mounting part disposed at an end of the shell, and a rotor mechanism disposed on the rotor mounting part. The shell has an inlet and an outlet and defines a low-pressure oil chamber and a high-pressure oil chamber therein. The high-pressure oil chamber and the low-pressure oil chamber are located at the same side of a periphery of the rotor mounting part. An engine cover comprising the oil pump and an engine comprising the engine cover are also provided.

Abstract: A torque generator is disclosed. The torque generator includes a valve arrangement including a spool valve and a valve sleeve. A torsion bar biases the valve arrangement toward a neutral position.

Abstract: A variable output assembly including a hydraulic pump disposed on a pump running surface located on a center section, end cap or other hydraulic mounting member. The pump may be a gerotor or other rotatable pump body. A support member is disposed between the pump running surface and the pump and includes a pump support surface having openings to permit fluid communication between the support member and the pump running surface. The support member is movable between neutral and a plurality of positions corresponding to forward and reverse directions of the output. In forward and reverse positions, the support member permits fluid communication between the pump and a first porting system, and in the neutral position the support member permits fluid communication between the pump and a sump through the support surface openings and a second porting system.

Abstract: A gerotor pump including a housing which includes a first supply socket and a second supply socket, an inner rotor, and an outer rotor rotatably located relative the housing. The inner rotor is located within the outer rotor, lobes of the inner and the outer rotors are engaged, and the inner rotor is centered around a rotational axis which is eccentric from an axis of rotation of the outer rotor. A pressure chamber with a high pressure and a low pressure section is defined between the inner and outer rotors. The inner rotor is rotatably arranged on a shaft cylinder which is fixed at one end of a central drive shaft of the pump and is centered about the rotational axis, whereby the inner rotor wanders in the outer rotor when the central drive shaft is turned. The inner rotor is provided with radial supply conduits extending from the pressure chambers to the shaft cylinder.

Abstract: A gerotor assembly includes a star, a ring, and an annular plug member, as well as an o-ring. The star member defines a center opening of a first diameter which is connectable to a low-pressure fluid reservoir. The ring member circumscribes the star member. The ring member defines, in conjunction with a stationary end cap of a fluid control device, a fluid channel connectable to a high-pressure fluid supply. The plug member is circumscribed by the star member, and defines a center bore of a second diameter less than the first diameter. The o-ring is positioned between the star and the plug members. The plug member forms a fluid seal against the end cap. A fluid control device includes the above gerotor assembly and a valve housing section. A method of assembling the gerotor assembly and fluid control device are also disclosed.

Abstract: A gerotor device includes a rotor having outwardly extending teeth and a stator having inwardly extending teeth. The inwardly extending teeth are formed by rollers each of which is received in a respective roller pocket in the stator. Each roller pocket has a maximum pocket width measured perpendicular to a pocket centerline. Each roller pocket defines a roller bearing surface having a first side that follows a first radius and a second side on an opposite side of the centerline that follows a second radius. Each radius is greater than ½ the maximum pocket width. Each roller pocket has an edge pocket width between a first pocket edge where the pocket transitions to a generally cylindrical section in the stator and a second pocket edge on an opposite side of the centerline. The edge pocket width is less than the maximum pocket width.

Abstract: A gerotor device includes a valving plate, a balancing plate structure, and a rotor positioned between the valving plate and the balancing plate structure. High pressure fluid flowing from the valving plate toward the rotor pushes the rotor toward the balancing plate structure. The balancing plate structure includes a balancing plate and a second plate. A cavity is defined between the balancing plate and the second plate. The balancing plate includes a fluid passage having a check valve and fluid passes through the fluid passage for pressuring the cavity. The balancing plate includes first and second relief holes extending through the balancing plate connected with the cavity.

Abstract: A pump unit includes a housing which has an outwardly open recess, in which a pump is arranged. The recess is closed by a cover. The pump unit also has a pressure relief valve which is arranged in an opening of the housing which opens to the outside. The pressure relief valve has a valve seat which is formed in the opening and against which a seat valve member is loaded in the closing direction by way of a prestressed compression spring. The seat valve member can be loaded in the opening direction by the outlet pressure of the pump.

Abstract: A fluid displacement system for a fluid producing subterranean well includes a well extending from a surface to a subterranean fluid bearing formation, the formation being in fluid communication with the well; and a gerotor pump in the well for pumping fluid from the formation to the surface.

Abstract: An internal gear pump includes a housing having a pump chamber in which an inner rotor and an outer rotor are arranged. A suction port in communication with a suction path and a discharge port in communication with a discharge path are formed at the housing. The pump chamber includes an inner wall having a suction region at a suction port-side and a discharge region at a discharge port-side. The suction region includes a first suction region extending towards the suction path from a pressing point, where the outer rotor is pressed when the internal gear pump is in operation, and a second suction region between the first suction region and the discharge region. A groove that enlarges a clearance between the outer rotor and the inner wall is formed in the first suction region, but the groove is not formed in the second suction region.

Abstract: Disclosed is a cycloidal pinwheel pair with uniform contact and one-tooth difference, comprising a stator and a rotor. Each gear tooth profile of the rotor has a modified recess provided symmetrically on both sides; the starting point (A) of the modified recess on one side of the gear tooth profile is located between a first point and a second point determined by locations of two limit positions, the end point (B) of the modified recess on the same side of the gear tooth profile is located between a third point and a fourth point determined by locations of two limit positions. By adopting the present disclosure, the internal leakage formed between high and low pressure chambers is effectively avoided, thereby significantly improving the volume efficiency and mechanical efficiency. Meanwhile, the present disclosure is extremely simple in structure and can be molded by one-time grinding with better manufacturability.

Abstract: An oil pump includes a first spill passage formed on a side surface (60) of a pump chamber (58) to communicate a hydraulic pressure chamber (54) with a first high pressure discharge passage (68) when the entire hydraulic pressure chamber (54) is positioned between the first high pressure discharge passage (68) and a first low pressure discharge passage (70). Therefore, when the hydraulic pressure chamber (54) passes between the first high pressure discharge passage (68) and the first low pressure discharge passage (70), the hydraulic pressure inside the predetermined hydraulic pressure chamber (54) escapes to the first high pressure discharge passage (68) through a first spill passage (76), so a hydraulic pressure value inside the hydraulic pressure chamber (54) is maintained at the pressure value inside the first high pressure discharge passage (68).

Abstract: An oil pump has a pump body, a pump cover, an outer rotor, and an inner rotor. The pump body includes a rotor chamber, a first inlet port, a first outlet port, a first inlet passage, a first outlet passage, a relief valve, a relief chamber formed on a discharge side of the relief valve, and a first oil return passage formed from the relief chamber to the first inlet passage. The pump cover has a second oil return passage. The first oil return passage is formed in an inner circumferential support wall of the rotor chamber as a groove-like recess and opens along an outer circumferential surface of the outer rotor. A support protrusion is formed near a portion where the second oil return passage is formed to support a front surface, in a radial direction, of the outer rotor.

Abstract: Methods for controlling the net-displacement of a rotary fluid pressure device are disclosed. One of the net-displacement control methods (47) includes obtaining a desired input parameter (23) and a relative position (21) of a first member (43) and a second member (35) of a fluid displacement mechanism. A determination of a first and second output value is then made for each of a plurality of volume chambers (45) when the volume chambers (45) are supplied with fluid at fluid inlet and fluid outlet conditions, respectively. A total output value is then computed for each of a plurality of control valve configurations (63) and compared to the desired input parameter (23). The control valve configuration (63) with the total output value most similar to the desired input parameter (23) is then selected. A plurality of control valves (15) are then actuated in accordance with the selected control valve configuration (63).

Abstract: In a gear pump, an outer rotor and an inner rotor are disposed in a rotor installation chamber defined by a pump body and a pump cover. A suction port groove and a discharge port groove are formed in at least one of the pump body and the pump cover. A narrowing portion is formed at a portion of a radially outer side wall portion of the suction port groove, the portion being close to a terminal end wall portion of the suction port groove. The narrowing portion narrows the groove width in the radial direction. A pressurizing region that pressurizes oil in the gear chamber is formed between the narrowing portion and the terminal end wall portion.

Abstract: Provided is a hollow rotor and method for making a hollow rotor for a gerotor system, the gerotor system including inner and outer rotors having interengaging lobed profiles. At least one of the inner or outer rotors comprises the hollow rotor, the hollow rotor including radially inner and outer walls radially spaced-apart in relation to a rotational axis of the rotor and walls extending between the radially inner and outer walls for closing axial ends of the hollow rotor. The radially inner and outer walls define therebetween a cavity, thus providing for a hollow or empty interior of the hollow rotor. At least one of the radially inner or outer walls forms a plurality of lobes circumferentially spaced-apart around the cavity.

Abstract: A continuously variable transmission (CVT) provided with an integrated gerotor pump that also acts as a rotation blocker is described herein. In one illustrated embodiment, the gerotor pump is used to pump lubrication and cooling fluid through a radiator and into the hollow shaft of the CVT.

Abstract: According to one embodiment of the invention, a gerotor apparatus includes an outer gerotor having an outer gerotor chamber, an inner gerotor, at least a portion of which is disposed within the outer gerotor chamber, and a synchronizing apparatus operable to control the rotation of the inner gerotor relative to the outer gerotor. The inner gerotor includes one or more entrance passages operable to communicate a lubricant into the outer gerotor chamber.