Abstract: The invention relates to a rotary screw machine of volume type comprising a body (30) having a main axis X, two members (10, 20), wherein a first one (20) surrounds a second one (10). Said first member (20) is hinged in said body (30) and is able to swivel on itself about its axis (Xf), aligned with said main axis X, according to a swiveling motion, whereas the axis (Xm) of said second member (10), revolves about the axis of said first member (Xf) according to an revolution motion having said length E as a radius. The machine further comprises a synchronizer (34, 36, 38, 40) synchronizing said swiveling motion and said revolution motion, such that a working medium performs a volumetric displacement in at least one working chamber (11) delimited by an outer surface (22) of said first member (20) and a inner surface (12) of said second member (10).

Abstract: A nano particle reinforced polymer element of a stator and rotor assembly for a power section of a positive displacement fluid motor or a progressive cavity pump. Nano-sized particles are blended with an uncured polymer to improve the physical and chemical properties of the polymer. The use of nano-sized particles reduces the quantity of reinforcement material required to manufacture the polymer for the stator and rotor assembly and lowers the viscosity of the uncured polymer to improve manufacturing characteristics. The use of chemically functionalized nano particles improves the chemical and physical characteristics of the polymer.

Abstract: A rotary fluid pressure device (11) has a stationary valve member (17), a rotatable valve member (51), and a valve seating mechanism (73). The valve seating mechanism (73) defines an outer balance ring member (75) having a valve-confronting surface (79) in engagement with an opposite surface (81) of the rotatable valve member (51) and an inner balance ring member (77) having a valve-confronting surface (111) in engagement with the opposite surface (81) of the rotatable valve member (51), with the outer balance ring member (75) and the inner balance ring member (77) being structurally independent from the other. The outer balance ring member (75) and the inner balance ring member (77) define a balance ring passage (71) which provides continuous fluid communication between a fluid inlet (53) or a fluid outlet (53) and the valve passages (61) in the rotatable valve member (51).

Abstract: An oil pump rotor for use in an oil pump includes an inner rotor having (n: “n” is a natural number) external teeth, an outer rotor having (n+1) internal teeth meshing with the external teeth, and a casing forming a suction port for drawing a fluid and a discharge port for discharging the fluid, such that in association with meshing and co-rotation of the inner and outer rotors, the fluid is drawn/discharged to be conveyed according to volume changes of cells formed between teeth faces of the two rotors.

Abstract: A gerotor pump comprises a rotor chamber having a longitudinally extending central axis, an outer rotor rotatable in the rotor chamber with a radial clearance between an outer periphery of the outer rotor and the rotor chamber, an inner rotor rotatable in the outer rotor and cooperably engageable therewith to define a plurality of pumping chambers having respective volumes that vary when, in use, the inner rotor rotates relative to the outer rotor. The inner rotor is rotatable about an axis of rotation spaced from the central axis and contained in a first plane that contains the central axis and the rotor chamber is configured such that the radial clearance in at least one direction in the first plane is greater than at least one radial clearance in a second plane that extends perpendicular to the first plane and contains the central axis.

Abstract: A small size gear pump having a disc-shaped case, inside which a flat cylindrical motor rotor chamber, a bearing chamber and a flat cylindrical gear chamber are arranged eccentrically from the bearing chamber and the rotor chamber, which are piled sequentially along an axial direction and are communicating to each other.

Abstract: A trochoid oil pump, which enables the endurance to be increased and the reduction of discharge pulsations and noise to be achieved, and in which those results can be realized with a very simple structure. An interdental space constituted by an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile starts a compression stroke in the location of a partition section between an intake port and a discharge portion, and a linking gap L is composed by the interdental space and a preceding adjacent interdental space realized in a discharge stroke. The linking gap expands gradually from the start of compression stroke to the discharge stroke.

Abstract: A gerotor device having a rotor and a stator, the rotor including a plurality of teeth defining a profile, each tooth being divided by a tooth axis. At least one tooth includes an inner recess and an outer recess spaced from the inner recess along the profile.

Abstract: The invention relates to an axial piston engine with a filling pump integrated in a receiving bore of the axial piston engine, which filling pump comprises a gerotor set with an externally toothed inner ring and an internally toothed outer ring and also an inner thrust plate and an outer thrust plate. The two thrust plates enclose the gerotor set between them and, on their surfaces facing away from the gerotor set, are in each case supported via a pressure field seal, which surrounds the pressure field regions formed in the thrust plates, in such a way on the housing walls axially enclosing the filling pump that lateral play in the form of axial mobility of the filling pump is guaranteed.

Abstract: The present invention provides an oil pump in which eroding of the inside of the pump due to cavitation and erosion is prevented by minimizing the pressure change in a fluid when inter-tooth spaces formed by an inner rotor and an outer rotor transport the fluid from the intake port to the discharge port. The oil pump comprises: an inner rotor; an outer rotor; an intake port; a discharge port; a transfer side partition part formed between a terminal end of the intake port and a leading end of the discharge port; and a shallow groove which is formed in the transfer side partition part, and which communicates with the discharge port but does not communicate with the intake port. The shallow groove does not intersect with the cell on the transfer side partition part, and is positioned farther inward than the circular locus of the gear bottom parts of the inner rotor.

Abstract: The rotary engine includes a cylinder body having a cylinder chamber, an intake port, an exhaust port, and a spark plug, and a rotor which is received in the cylinder chamber to eccentrically rotate while coming into contact at seal faces thereof with an inner circumferential contact wall of the cylinder chamber to thereby implement intake, compression, expansion, and exhaust strokes. The rotor has an elliptical outer contour, and the inner circumferential contact wall of the cylinder chamber coincides with a specific curve, which is described by opposite apexes of the elliptical rotor in a direction of a major axis, when the rotor eccentrically rotates. The intake port and exhaust port are provided with opening/closing valves, respectively. Sealing performance between the cylinder chamber and the rotor may achieve an enhancement in the efficiency of fuel combustion and engine output and prevent waste of fuel.

Abstract: A split-pressure, dual-pump system for supplying hydraulic fluid to a multi-speed transmission is provided. The system includes a low-pressure work circuit operatively connected to a fixed displacement pump, and a high-pressure work circuit operatively connected to a variable displacement pump. The system also includes a regulator valve fluidly coupled to the variable displacement pump via a decrease circuit and an overage circuit for regulating the flow of fluid to the high-pressure work circuit. The invention consists of separating the high-pressure needs of the system into a separate work circuit from the low-pressure needs of the system, and optimizing pump design separately for each work circuit to maximize transmission efficiency and reduce parasitic losses. A method of supplying hydraulic fluid to a multi-speed transmission at variable flow and pressure is also provided.

Abstract: An embodiment of a gerotor apparatus includes a housing including a first member. The first member includes a brake pin aperture formed therein. The apparatus also includes a brake pin at least partially interposed within the first member. The brake pin includes a first annular surface and a second annular surface. The first annular surface defines, at least in part, a first brake chamber. The second annular surface defines, at least in part, a second brake chamber. A first fluid introduced into the first brake chamber will urge the brake pin in a first direction. A second fluid introduced into the second brake chamber will urge the brake pin generally in the first direction.

Abstract: A pump assembly including a gerotor pump having an inlet and an outlet, and comprising an annulus and a lobed rotor, one, but not both, of the rotor or annulus being split axially into two parts, the pump further comprising indexing means for angularly shifting one part relative to the other part, the indexing means comprising a chamber having a first indexing port and a second indexing port, and a partition which divides the chamber into a first portion including the first indexing port and a second portion including the second indexing port, wherein the partition comprises a part which is pivotally mounted within the chamber for angular movement within the chamber.

Abstract: The gear pump unit (100) comprises a pump cover (1), an internal rotor (16) mounted rotatably in a recess (9) of the pump cover (1) and formed in a rotationally fixed manner on a driven plug-in shaft (11), and an external rotor (19), which is rotatably mounted in the recess (9) of the pump cover (1) eccentrically relative to the axis of rotation (A) of the internal rotor (16). The external rotor (19) is in mesh with the internal rotor (16) only in a first angle-of-rotation range (?). In a second angle-of-rotation range (?) lying opposite the first angle-of-rotation range (?), the internal rotor (16) is in contact with an inner surface (25) of a web (23), which is disposed in the recess (9). The outer surface (26) is in contact with the external rotor (19). After closing of the recess (9) by a cover plate (27) fastened to the pump cover (1), an admission pressure chamber (21) and a low-pressure chamber (22) are therefore formed in the recess (9).

Abstract: The invention concerns a hydraulic machine with a toothed set comprising a toothed ring with an inner toothing, whose circumferential surface extends in parallel with its axis, and a gear wheel (3) with an outer toothing, whose circumferential surface (24) extends in parallel with its axis, at least one tooth flank having an edge as an axial end of a section, which is located between the circumferential surface and a surface directed radially inwards. It is endeavored to reduce the wear. For this purpose it is ensured that in the radial direction an edge (22, 23) ends so as to be offset inwards in relation to the circumferential surface (24).

Abstract: A hydraulic pump for a vehicle includes: a block; a pulley receiving an engine torque and rotating; a pump housing attached to the block; an outer rotor mounted in the pump housing; an inner rotor mounted inside the outer rotor, with gear teeth at an interior surface thereof; a pinion gear engaged to the interior surface of the inner rotor; a planet carrier connected to and rotating the pinion gear and having a carrier drive shaft with an end fixedly connected to the pulley; and a sun gear engaged to the pinion gear and having a sun gear drive shaft, housed in the carrier drive shaft, and axially slidable. A first end of the sun gear drive shaft is attached to the carrier drive shaft under a first operating condition, and a second end of the sun gear drive shaft is attached to the block under a second operating condition.

Abstract: A trochoidal oil pump which makes it possible to achieve an improved reduction in discharge pulsation and noise, and which makes it possible to realize such a reduction using an extremely simple structure. The trochoidal oil pump of the present invention comprises a rotor chamber 1 which has an intake port 2 and discharge port 3, an outer rotor 6 and an inner rotor 5. A plurality of inter-tooth spaces S, S, . . . that are formed by the tooth shapes 5a and 6a of the inner rotor 5 and outer rotor 6 comprise a maximum sealed space Smax that is positioned in the region of the partition part 4 between the intake port 2 and discharge port 3, a plurality of inter-tooth spaces S, S, . . . within the region of the intake port 2, and a plurality of inter-tooth spaces S, S, . . . within the region of the discharge port 3. The plurality of inter-tooth spaces S, S, . . .

Abstract: An oil pump to be insatalled to an engine of an automotive vehicle. The oil pump includes a section defining a suction port and a section defining a discharge port. A main unit of the oil pump has a section defining a plurality of pump chambers. Volume of each pump chamber continuously changes to increase and decrease under driving of the engine so as to pressurize oil sucked through the suction port and discharge the oil through the discharge port. A section defining an oil chamber to which the oil flows is provided such that the oil chamber has a vertically upper side which is communicated with the discharge port through a communicating hole.

Abstract: A rotary fluid pressure device (11) includes a plate assembly (17) having a plate member (71) and at least one cover plate (105), which defines a mounting surface (107) adapted for sealing engagement with an exterior surface (77) of the plate member (71), or at least one control valve assembly (105), which defines a mounting surface (117) adapted for sealing engagement with the exterior surface (77). The cover plate assembly (105), when mounted to the exterior surface (77), provides fluid communication between openings (95, 97) of upstream and downstream fluid passages (91, 93), thereby providing single-speed functionality. The control valve assembly (115), when mounted to the exterior surface (77), provides selective fluid communication between the openings (95, 97) of upstream and downstream fluid passages (91, 93), thereby providing multi-speed functionality.

Abstract: A corrosion resistant hydraulic motor includes a housing, an output shaft extending through an opening in the housing, a sealing member contacting the output shaft and a water proof coating disposed on an exterior surface of the housing and on the sealing member. The sealing member is configured to cooperate with the output shaft to preclude corrosive material from passing through the opening into an internal compartment of the motor.

Abstract: A hydraulic rotary motor, in particular to a stewing gear for elevating plant such as excavator grabs, etc., comprising a housing in which a rotor is rotatably received as well as a ring piston having an inner toothed arrangement and an outer toothed arrangement which is seated between the rotor and the housing so that displacement chambers are formed between the ring piston and an outer toothed arrangement of the rotor and/or an inner toothed arrangement of the housing, with a first motor connector being rotatably fixedly connected to the housing and a second motor connector being rotatably fixedly connected to the rotor. The hydraulic rotary motor is characterized in that the rotor is axially and radially supported at the housing via plain bearings and the second motor connector connected to the rotor is solely supported via the plain bearings at the housing.

Abstract: A gerotor pump includes an outer rotor having a first toothed surface and lobes that extend inwards. An inner rotor is eccentrically aligned relative to the outer rotor and includes a second toothed surface and lobes that extend outwards. Planetary gears are located between the outer rotor and the inner rotor. Each planetary gear has a third toothed surface that intermeshes with the first toothed surface and the second toothed surface.

Abstract: A pressure compensation mechanism for a gerotor motor is disclosed, which mechanism includes a shuttle valve that selectively interconnects either port to a single pressure chamber and thus to compensate for any pressure-induced imbalances in the device.

Abstract: A rotary fluid pressure device (11) has a stationary valve member (17), a rotatable valve member (51), and a valve seating mechanism (73). The valve seating mechanism (73) defines an outer balance ring member (75) having a valve-confronting surface (79) in engagement with an opposite surface (81) of the rotatable valve member (51) and an inner balance ring member (77) having a valve-confronting surface (111) in engagement with the opposite surface (81) of the rotatable valve member (51), with the outer balance ring member (75) and the inner balance ring member (77) being structurally independent from the other. The outer balance ring member (75) and the inner balance ring member (77) define a balance ring passage (71) which provides continuous fluid communication between a fluid inlet (53) or a fluid outlet (53) and the valve passages (61) in the rotatable valve member (51).

Abstract: A gerotor device having a rotor and a stator, the rotor including a plurality of teeth defining a profile, each tooth being divided by a tooth axis. At least one tooth includes an inner recess and an outer recess spaced from the inner recess along the profile.

Abstract: In order to realize cost reduction in a gear pump apparatus by reducing form accuracy of a gear while securing pump performance, a running-in coating is provided on a tooth sliding contact portion when forming a confinement area in at least one of gears of the gear pump apparatus. By this feature, the running-in coating is gradually worn away and deformed according to rotary drive of the pump, and thus it is possible to obtain an optimal gear form in meshing combinations of the gears. Further, it is possible to reduce leakage inside the pump to secure the pump performance even if the form accuracy of the gear is reduced for the sake of the cost reduction.

Abstract: A rotary fluid pressure device defining a fluid inlet (17), an output shaft (37), and a housing (41,43) defining a brake chamber (61), a piston member (63,65) being disposed therein and biased toward an engaged position by a spring (69). Braking means (57,59) is associated with the piston and the output shaft, such that movement of the piston to the engaged position results in braking of said output shaft. The housing defines a fluid pressure port (73) in communication with the fluid inlet, and the piston defines a large pressure release chamber (71) in fluid communication with said fluid pressure port. The piston defines a small pressure release chamber (89) also in fluid communication with the fluid pressure port. A valve means (75,81) is operable, when fluid pressure in the large release chamber reaches a predetermined pressure, to communicate the large to a source of low pressure fluid.

Abstract: A housing for a motor having fluid passages integrated within. The passages include a first passage for receiving a fluid from outside the motor, a second passage for directing the fluid away from the motor, and at least one other passage from conveying the fluid to a set of components attached to the motor housing. The housing has at least one relief valve positioned within the fluid passages for diverting a portion of the fluid directly from the first passage to the second passage.

Abstract: A fluid pump includes a housing having a lateral wall and an end wall, an insert located in the housing surrounded by the lateral wall and including a body having a central aperture and inlet and outlet fluid channels. A seal, located between the end wall and the insert, seals against fluid flow therebetween. A Gerotor pump mechanism located in the housing adjacent the inlet and outlet fluid channels includes a outer gear and an inner gear engaged with the outer gear for pumping fluid from the inlet fluid channel to the outlet fluid channel as the inner gear rotates relative to the outer gear. A cover, fitted in the housing and spaced axially from the end wall, is located adjacent the inner gear and outer gear and is secured to the housing.

Abstract: A wobblestick with driving teeth with a helix which is equal to or less than 1° of the running angle of the wobblestick.

Abstract: A gerotor mechanism is used to guide the rotation of a turntable having a Reuleaux triangle shape. In one version, the mechanism includes a gerotor having three lobes, and the gerotor guide has a guide profile including four recesses for receiving the lobes of the gerotor. Rotation is governed by a 4:3 hypocycloid function. The profiles of the gerotor and the gerotor guide are expanded uniformly from an original hypocycloid pattern so that rotation of the turntable results in execution of the hypocycloid function while retaining the gerotor in controlled contact with the profile of the gerotor guide. A reciprocal of the hypocycloid function yields a “cloverleaf” gerotor. Substantially planar bearing surfaces may be used at the interface of (a) the turntable and the gerotor guide, (b) the gerotor and the gerotor guide, or (c) the gerotor and the underlying support surface. The gerotor guide and turntable may be part of a cabinet or built into a kitchen countertop.

Abstract: A gerotor mechanism is used to guide the rotation of a turntable having a Reuleaux triangle shape. The mechanism includes a gerotor having three lobes; the gerotor guide has a guide profile including four recesses for receiving the lobes of the gerotor. Rotation is governed by a 4:3 hypocycloid function. The profiles of the gerotor and the gerotor guide are expanded uniformly from an original hypocycloid pattern so that rotation of the turntable results in execution of the hypocycloid function while retaining the gerotor in controlled contact with the profile of the gerotor guide. Substantially planar bearing surfaces may be used at the interface of (a) the turntable and the gerotor guide, (b) the gerotor and the gerotor guide, or (c) the gerotor and the underlying support surface. The gerotor guide may be part of a cabinet or built into a kitchen countertop.

Abstract: An integrated speed reducer and gerotor pump is disclosed. The device comprises a motor, a speed reducer, and a gerotor pump. The motor provides torque at an elevated speed. The speed reducer is coupled with the motor and converts the torque at an elevated speed into torque at a reduced speed. The gerotor pump is coupled with the speed reducer and uses the torque at the reduced speed for pumping fluids.

Abstract: A dual shaft gerotor motor (11) of the type comprising a gerotor gear set (13) including an internally-toothed ring member (15) and an externally-toothed star member (17). The motor (11) includes substantially identical first (25) and second (27) motor housing assemblies attached to first (21) and second (22) axially opposite ends of the gerotor gear set (13), and defining first (47) and second (45) fluid ports, respectively. Each of the motor housing assemblies defines a plurality N of fluid passages (65), each of which is in fluid communication with one of said fluid volume chambers (19) defined by the gerotor gear set (13). The first fluid port (47) comprises an inlet port and the first motor housing assembly (25) and the first valve means (37) cooperate to provide first commutating fluid communication from said inlet port (47) to said expanding fluid volume chambers (19).

Abstract: A hydraulic rotating motor for the driving mechanism of electricity consumers. The rotating motor preferably has revolving working pressure chambers, which are acted upon by hydraulic fluid for producing a rotational movement, which is transferred to a driven shaft. Electricity is supplied to a consumer, through a lead which is passed from the outside into a stationary head, through an interior of the rotating motor to the consumer. In a vehicle with the motor, leads supplying electricity are passed protected within a radial arm to a head of the rotating motor and, from there, through the interior of the rotating motor to the consumer of electricity.

Abstract: A rotary piston machine having a housing defining a prismatic chamber the cross section of which forms an oval of odd order. A rotary piston is guided in the chamber and, in each position, subdivides the chamber into two working chambers. Piston-fixed instantaneous axes of rotation of the rotary piston are defined in a center plane. The rotary piston, in each interval of movement, is rotating with one of opposite nappe sections in an inner wall section about an associated instantaneous axis of rotation and is sliding with the opposite nappe section along the opposite second inner wall section of the chamber and is reaching a stop position there.

Abstract: A rotary engine is provided that comprises a compression cylinder and combustion cylinder divided by a separation wall. Air or a fuel/air mixture is drawn into the compression cylinder, compressed, and then transferred to the combustion cylinder. The compressed air or air/fuel mixture is ignited in the combustion cylinder, creating an expansion of the combustion gases which drives the system. The compression and combustion cylinders have epicycloidal-shaped chambers that each house a single vane. The vanes pass through the crankshaft and adjust to remain in contact with the chamber walls as the crankshaft rotates. The compression ratio of the present invention can be maximized by adjusting the thicknesses of the compression and combustion cylinders as well as by offsetting the positions of the compression and combustion vanes with respect to one another.

Abstract: A rotary fluid pressure device having a housing member, a manifold assembly, an internally generated rotor type gerotor set, an end plate, and a rotatably journaled torque transfer shaft interconnected with the gerotor set and extending within the housing member and manifold assembly. The gerotor set having at least an internally toothed stator member and a rotating rotor member disposed within the stator member. The rotor member having a first and second axial end surface and external teeth which interengage with the internal teeth of the stator to define a plurality of expanding and contracting volume chambers. The rotor member also having a plurality of circumferentially spaced laterally directed fluid paths fluidly connecting the manifold assembly with a plurality of circumferentially spaced radiating fluid paths which directly connect with the volume chambers. The fluid pressure device further including a plurality of coupling members for interconnecting the components.

Abstract: A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction from the oil chambers to the first oil passageway.

Abstract: A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction to the oil chambers from the first oil passageway to the oil chambers.

Abstract: A hydraulic gerotor motor utilizing the holes surrounding the main assembly bolts together with interconnecting radially extending passages so as to allow for the transfer of fluid axially through the device from a single fluid input hole to an area 360° surrounding a valve.

Abstract: Disclosed is a variable-volume rotary machine a principle of which is that the elements, which act as the rotary piston elements, themselves rotate about a secondary axis that passes through the piston element as they orbit about the primary axis of the machine. The operation volume of the present invention is a modified toroidal defined as the volume swept out by the piston elements as they simultaneously orbit the primary axis and rotate about the secondary axes. Described are two preferred embodiments of the present invention, one in which the piston elements rotate about an axis that is perpendicular to the axis of the toroid, and the other in which the piston elements rotate about an axis that is parallel to the axis of the toroid.

Abstract: A valve member includes an axially movable spool valve rotatably mounted in the valve member to cause the way that fluid is communicated between the inlet and outlet ports of the device and the volume chambers thereof. An outer surface of the spool has a configuration to react to fluid pressure to effect the timing between the gear set and the valving of valve member and that the timing therebetween will be adjusted when the spool valve is moved axially. A valve actuator comprising a spring loaded plunger controlled by fluid pressure at the inlet and outlet ports is in physical contact with one end of the valve spool.

Abstract: A method of controlling shifting of a multiple ratio fluid motor (10) between first and second speed ratios. The motor includes a shift valve (61) operable to achieve the second speed ratio by interconnecting recirculating volume chambers (33R). The method includes providing a pressure control valve (75) in communication with a source (73) of pressure fluid, the valve (75) being operable to communicate a pilot pressure to the shift valve in response to changes in a command signal between a first signal (113B) and a second signal (113C). When a shift to the second condition is commanded, the method changes the command signal (113) from the first to the second over a first time (T1). For a shift back to the first condition (FIG. 3), the method changes the electrical command signal (113) from the second to the first over a second time (T2), wherein T2 is greater than T1.

Abstract: A method of controlling shifting of a multiple ratio fluid motor (10) between first and second speed ratios. The motor includes a shift valve (61) operable to achieve the second speed ratio by interconnecting recirculating volume chambers (33R). The method includes providing a pressure control valve (75) in communication with a source (73) of pressure fluid, the valve (75) being operable to communicate a pilot pressure to the shift valve in response to changes in a command signal between a first signal (113B) and a second signal (113C). When a shift to the second condition is commanded, the method changes the command signal (113) from the first to the second over a first time (T1). For a shift back to the first condition (FIG. 3), the method changes the electrical command signal (113) from the second to the first over a second time (T2), wherein T2 is greater than T1.

Abstract: A hydraulic motor comprising a housing having inlet and outlet ports and an access port for connecting a pressure fluid to an accessory of the motor, such as a brake. A shuttle valve integrally contained within the housing selectively communicates the pressure at one of the inlet port or the outlet port to the access port. In addition, the housing has at least two axial sections that are sealed at a parting line therebetween, and the shuttle valve is inserted through an opening in one section so that when the sections are joined, the opening is sealed at the parting line. A ring of bolts holds the sections together, and the shuttle valve is contained at least partially within the envelope formed by the ring.

Abstract: A hydraulic device for one of a motor and pump, having a manifold assembly positioned between a gerotor set and a housing for the device, the manifold assembly adapted for conducting pressurized fluid to the gerotor set and conducting exhaust fluid from the gerotor set. The manifold assembly having a first axial end, a second axial end, a central internal bore extending freely from the first axial end to the second axial end and adapted for conducting at least a portion of one of the fluids, a first fluid passage extending directly from the central internal bore to a location radially outward from the central internal bore and therefrom to the second axial end, and a second fluid passage extending substantially laterally from the second axial end to the first axial end.

Abstract: A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction from the first oil passageway to the oil chambers.

Abstract: A rotary fluid pressure device having a housing member, a manifold assembly, a gerotor set, a channeling plate and an end plate. The gerotor set having a stator member with at least one axial fluid path extending therethrough and a rotor member, disposed within said stator member, having an axial end surface with a recess, and a plurality of axially extending through holes for fluid flow therethrough adapted for hydraulically axially balancing its axial ends relative to the stator. The channeling plate having a first and second fluid passage extending therethrough, and a plurality of through holes. Means for routing the high pressure fluid from the housing member through the gerotor set, through the channeling plate first and second fluid passages, into and subsequently out of a cavity between the channeling plate and the end plate and into the rotor recess to overbalance the rotor towards the manifold assembly.