Abstract: A valve plate assembly (1) of a hydraulic axial piston machine is described, the valve plate assembly comprising a wear plate (2) made of a ceramic material surrounded by a compression ring (4). Such a valve plate assembly should be produced and maintained in a cost-effective manner. To this end, the wear plate (2) is connected to a support plate (3) by means of the compression ring (4).

Abstract: An aftertreatment system comprises a SCR system, a first filter, and a second filter disposed downstream of the first filter and a bypass conduit providing a flow path bypassing the second filter. A valve is operatively coupled to the bypass conduit and is moveable between a closed position in which the exhaust gas flows through the second filter, and an open position in which at least a portion of the exhaust gas flows through the bypass conduit. A controller is operatively coupled to the valve configured to adjust the valve based on a first filtration efficiency of the first filter to cause the exhaust gas expelled into the environment from the aftertreatment to have a particulate matter count meeting particulate matter emission standards.

Abstract: A hydraulic control system for control of a hydraulic motor. The hydraulic control system comprises a fluid distribution assembly having a tank, a pump to pump fluid from the tank and a directional valve for distributing pressurised fluid from the pump and to return fluid to the tank; a valve assembly fluidly connected to the directional valve, the valve assembly having a first overcenter valve and a pressure reducing valve wherein a first main line connects the directional valve to the first overcenter valve and wherein a shuttle line connects the pressure reducing valve to the first main line; a hydraulic motor fluidly connected to the valve assembly wherein the first main line connects the hydraulic motor to the first overcenter valve; and a brake assembly fluidly connected to the pressure reducing valve, wherein a drain line connects the pressure reducing valve to the hydraulic motor.

Abstract: A piston pump includes a ported member that is moveably disposed within an internal space of a housing between a rotating group and the housing. The ported member includes a first face facing the rotating group and a second face facing a fluid inlet and outlet. The ported member includes an intake port and a discharge port. Moreover, the ported member includes a balance aperture configured to pass fluid between the biasing member and a pump chamber as the rotating group rotates within the internal space such that the biasing member biases the ported member toward a balanced position within the internal space. The balance aperture has a rim at the first face. The rim is clefted at a relief feature of the first face. The relief feature is recessed into the first face.

Abstract: A hydraulic machine is described comprising a first part (1, 4) and a second part (7, 8), wherein the first part (1, 4) and the second part (7, 8) are movable relatively to each other in abutting relation, the first part (1, 4) comprises a pressure chamber (2) having a pressure chamber opening (6) in a contact face (5) contacting a sealing face (9) of the second part (7, 8), the second part (7, 8) comprises a low pressure area (10) connected to a low pressure opening (11) in the sealing face (9) and a high pressure area (12) connected to a high pressure opening (13) in the sealing face (9), wherein during a movement of the first part (1, 4) with respect to the second part (7, 8) in a moving direction (14) the pressure chamber opening (6) comes alternatingly in overlap with the low pressure opening (11) and the high pressure opening (13). Such a machine should be flexible in operation with low risk of damages caused by cavitation.

Abstract: A thrust bearing assembly is provided for the pistons of a hydrostatic drive motor. The thrust bearing assembly includes first and second retainer components removably interconnected to form a retainer assembly, a thrust bearing captured between and encompassed by the first and second retainer components, and locking tangs extending outward from the first and second retainer components. Corresponding catches are formed on the internal surface of the housing to engage the locking tangs when the thrust bearing assembly is installed in the housing.

Abstract: An axial piston machine for at least one of a pump and a motor operation includes a housing, connection plate, piston drum, and working piston. The connection plate is connected to the housing. The piston drum is arranged on a rotatable drive shaft in the housing interior and defines at least one cylinder bore. The working piston is arranged in a longitudinally displaceable manner in the cylinder bore. The cylinder bore delimits a cylinder space having a changeable volume. The cylinder space is configured to connect to at least one pre-compression space via at least one hydraulic connection. The at least one pre-compression space is defined by a cavity within the connection plate. The cavity is defined by the connection plate and a closing element. The closing element is arranged between the connection plate and the housing interior.

Abstract: A hydrostatic axial piston pump of swashplate construction, which is also configured to be operated as a motor, has a stationary control plate against which a rotating cylinder drum is tensioned. During operation, a tilting tendency of the cylinder drum arises in the direction of that quadrant of the control plate which is operatively connected to the first part of the displacement stroke of the pistons. The control plate has a supporting device configured for the cylinder drum. The supporting device is arranged adjacent to an outer edge of the control plate in the first quadrant thereof. The supporting device is configured to be formed by a hydrostatically relieved additional field.

Abstract: A hydraulic motor includes a motor mechanism that rotates by hydraulic liquid that is supplied/discharged from a hydraulic liquid pressure source through one of a first motor passage and a second motor passage. The hydraulic motor comprises a casing that defines a casing chamber which accommodates the motor mechanism, and a flushing passage that is in communication with the casing chamber and extracts a portion of the hydraulic liquid from a low pressure side among the first motor passage and the second motor passage and leads it to the casing chamber.

Abstract: A slipper retainer of a hydraulic unit having a circular body having a back surface and an outer edge, the circular body defining a diameter of about 2.240 inches (5.629 cm), a central aperture through a center of the circular body, the circular body having a curved surface defining an edge of the central aperture, wherein the curved surface is defined by a sphere that is centered at a point located a distance of about 0.209 inches (0.531 cm) from the back surface of the body, and a plurality of slipper apertures located between the curved surface of the circular body and the outer edge of the circular body, wherein each slipper aperture of the plurality of slipper apertures has a diameter of about 0.464 inches (1.179 cm).

Abstract: A slipper retainer ball of a hydraulic unit having an aperture passing through a body, the body having a flat bottom surface, a flat top surface, an external curved surface, and an interior profiled surface that extends in an axial direction from the bottom surface to the top surface. The interior profiled surface includes a first surface extending parallel to the axis from the bottom surface in the axial direction, a second surface extending perpendicular to the axis from the first surface and outward toward the external curved surface, a third surface extending from the second surface axially at a first angle, a fourth surface extending from the third surface in the axial direction, and a fifth surface extending from the fourth surface to the top surface at a second angle that is skew from the axis. The axial thickness of the body is about 0.471 inches.

Abstract: A valve plate is used in a swash plate type motor including a motor shaft and a cylinder block in a motor housing and includes: a sliding supporting surface contacting a rear end surface of the cylinder block to support the cylinder block; a supporting surface that is a surface corresponding to and opposite to the sliding supporting surface; a central through hole through which the motor shaft penetrates; and a plurality of ports and formed around the central through hole as inlets and outlets of operating oil so as to penetrate the valve plate, and a cooling concave portion into which the operating oil flows is formed in a region except for the ports and on the supporting surface.

Abstract: One or more examples of the gas boosters described herein aim to provide a light weight gas booster configured to produce high output pressure levels at high volumes. Generally described, one or more examples of the gas boosters reduce the dead volume in a piston assembly, thereby increasing the ratio of the output pressure to the input pressure. In that regard, several examples of the gas boosters disclosed herein have a first check valve as a disk-type check valve or the like and a second check valve as a ball-type check valve or the like. Furthermore, one or more examples include an inwardly acting cam configured to convert rotary motion to reciprocating motion by an inner surface thereof.

Abstract: A hydraulic transmission having a hydraulic pump, a hydraulic motor and a center section having a pump running surface on which the hydraulic pump rotates and a motor running surface of which the hydraulic motor rotates. The center section has porting by which the hydraulic pump and the hydraulic motor are in fluid communication wherein the porting terminates in a pair of equidistantly spaced, generally arcuate shaped openings. The pump running surface includes a plurality of generally v-shaped grooves extending from each of the ends of the generally arcuate shaped openings.

Abstract: A push-push type fluid pressure actuated motor has one or more radial opposed cylinder sets each having a pair of pistons, a connecting rod, and a Scotch-yoke connection to a crankshaft. An intake rotor valve at one face of the cylinder block and an exhaust rotor valve at an opposite face of the cylinder block are mounted on and rotate with the crankshaft. The rotor valves admit pressurized fluid to the cylinder and allow discharge of spent fluid from the cylinders.

Abstract: A hydraulic transmission having a hydraulic pump, a hydraulic motor and a center section having a pump running surface on which the hydraulic pump rotates and a motor running surface of which the hydraulic motor rotates. The center section has porting by which the hydraulic pump and the hydraulic motor are in fluid communication wherein the porting terminates in a pair of equidistantly spaced, generally arcuate shaped openings. The pump running surface includes a plurality of generally v-shaped grooves extending from each of the ends of the generally arcuate shaped openings.

Abstract: A hydraulic power transmission joint provided with a rotary valve in which a first enclosing hole is bored and moreover, a first spool valve, a first spring, a first pin member and a first communicating hole are provided. Further, a second communicating hole is also provided therein in such a manner as to be coaxial with the first communication hole. Moreover, a second enclosing hole having a smaller diameter is bored therein. Furthermore, a second spool valve having a diameter smaller than that of the first spool valve, a second spring, a second pin member, a third communicating hole, a fourth communicating hole and an orifice are provided therein. Further, a valve element, whose position is controlled, is enclosed in a high-pressure chamber formed in the rotary valve.

Abstract: An axial plunger slurry pump comprises a pump body, a sloping cam plate, a swashplate, cylinders, plungers and a pump head. Each of the plungers comprises a plunger body with a rubber piston positioned in its front end and being able to slide over it, and an oil receiving gap communicating with an oil passage disposed between two facing end surfaces of the plunger body and the rubber piston. There are check valves each of which is provided in an oil passage between a ball of each of two-ball links, which ball is coupled with the swashplate, and the swashplate. Each of the cylinder and the plunger body are fitted together by means of a half-and-half locating pad, a cylinder sleeve, a pressing cap, and a locking device. The pump may be used widely in drilling, electric power, mine, building, and metallurgy, etc., for conveying mud, mortar, ore pulp, coal pulp, concrete, etc.

Abstract: A hydraulic power transmission joint provided with a rotary valve in which a first enclosing hole is bored and moreover, a first spool valve, a first spring, a first pin member and a first communicating hole are provided. Further, a second communicating hole is also provided therein in such a manner as to be coaxial with the first communication hole. Moreover, a second enclosing hole having a smaller diameter is bored therein. Furthermore, a second spool valve having a diameter smaller than that of the first spool valve, a second spring, a second pin member, a third communicating hole, a fourth communicating hole and an orifice are provided therein. Further, a valve element, whose position is controlled, is enclosed in a high-pressure chamber formed in the rotary valve.

Abstract: Fluid distributing apparatus for radial piston-type hydraulic pumps or motors is disclosed. In the apparatus, a valve casing is mounted to a housing of the pump or motor. A plate valve is seated in the central portion of the valve casing and selectively rotates while maintaining a dynamic balance. A fluid distributing plate and a pressure plate are arranged in the valve casing and are brought into close contact with top and bottom surfaces of the plate valve, thereby allowing the plate valve to selectively rotate under the state of dynamic balance. A retaining ring is interposed between the fluid distributing plate and the pressure plate and surrounds the plate valve, thereby removing dynamic friction from relatively-moving portions of the plate valve, pressure plate and fluid distributing plate.

Abstract: A hydraulic power transmission joint provided with a rotary valve in which a first enclosing hole is bored and moreover, a first spool valve, a first spring, a first pin member and a first communicating hole are provided. Further, a second communicating hole is also provided therein in such a manner as to be coaxial with the first communication hole. Moreover, a second enclosing hole having a smaller diameter is bored therein. Furthermore, a second spool valve having a diameter smaller than that of the first spool valve, a second spring, a second pin member, a third communicating hole, a fourth communicating hole and an orifice are provided therein. Further, a valve element, whose position is controlled, is enclosed in a high-pressure chamber formed in the rotary valve.

Abstract: A hydraulic machine is disclosed in several embodiments as a pump, as a motor, and as a combination pump/motor. The machine's fixed cylinders are positioned circumferentially to a drive shaft, the pistons being driven by, or acting against, a split swash-plate which is supported primarily by the same main bearing in which the drive shaft rotates. The inclination of the split swash-plate is adjusted by an axially-movable servo mechanism which is also arranged circumferentially to the drive shaft. Preferred embodiments include, among other features, (i) various gimballed-yoke supports for the non-rotating portion of the swash-plate, (ii) various designs for a rotating valve-plate, and (iii) a radial valve system. The unique arrangement of elements provides a machine that is remarkably compact and lightweight, being (a) significantly smaller than commercially-available machines having similar horsepower ratings and (b) operable hydrodynamically (i.e., at constant horsepower) at reduced speeds.

Abstract: The hydrostatic motor of this invention includes a fluid pressure unit having a stator and a rotor. The rotor includes a cylinder block containing a plurality of radially disposed cylinder bores therein. At one end, close to the axis of the rotor's rotation, each of those cylinders is connected to a corresponding bore extending substantially in axial direction. Therefore, the center lines of the outlets of all bores are disposed on the same pitch diameter on the front face of the cylinder block. On this front face a distribution face of the cylinder block is provided containing said outlets. A lobed cam ring is fixed to the stator. Each cylinder bore houses a roller abutting the cam ring and thereby reciprocating a piston radially within the bore in response to the lobes of the cam ring. A control device is provided as a part of the stator.

Abstract: A positive displacement pump for slurry incorporating particulate solids in suspension to provide an initial inlet port opening clearance corresponding to the exposed area of overlap between the port and each corresponding cylinder opening sufficient to permit substantially uninterrupted passage of particulate solids at the commencement of each suction cycle, the cylinder openings and following the initial overlap the total cross-sectional flow area exposed to each of the ports is generally constant irrespective of the rotational position of the barrel within the housing such that a constant volummetric flow rate of the driving fluid tends to effect a corresponding substantially constant volummetric flow rate of the fluid to be pumped.

Abstract: Axial piston fluid translating units commonly experience undesirable shaft deflections and barrel tilting during operation. A fluid translating unit includes a barrel plate interposed the end of a barrel and a porting surface defined within a housing thereof. The barrel plate is axially spaced from an end of the barrel and is in face sealing engagement with the porting surface. The barrel plate defines a plurality of fluid ports, each communicating between one of a plurality of barrel cylinder bores and the porting surface. In one aspect a plurality of counterbores are provided in the barrel in surrounding relation to the fluid ports. A plurality of seal rings having a sealing end defining an annular seal face of a predetermined width for face sealing engagement with the barrel plate. The seal rings are each disposed in one of the counterbores in circumferential sealing relation of a predetermined length which is no greater than the width of the sealing face.

Abstract: A fluid pressure energy translating device of the rotary, variable displacement type having a timing device providing gradual rise and reduction of pressure between the cylinder bores and the inlet and outlet ports. The timing device is in the form of a valve plate having a metering groove with a double notch design which exits into an associated outlet port, and a long single "V" notch metering groove which exits into a associated inlet port.

Abstract: The design and construction of seals located between a cylinder barrel and a barrel plate rotatable therewith for axial piston fluid translating units have caused an increase in overall unit size, increased stiffness between the barrel and barrel plate and an increase in manufacturing cost and complexity. The present invention overcomes these problems by providing an axially compact, combined circumferential and axial face seal means. The seal means includes an annular seal ring having a sealing end and a biasing end with the sealing end defining an annular seal face of a predetermined width. A biasing means is attached to the biasing end of the seal ring and includes a spring ring having a generally flat base plate with a plurality of resilient fingers angularly extending therefrom. The axially compact structure of the seal means of this invention provides the required flexibility between the barrel and barrel plate while reducing overall unit size, and cost and complexity of manufacturing.

Abstract: The compressed air radial motor includes a supporting disc, supporting a plurality of fluid cells, which is pneumatically controlled by a control head disposed rotatably fixed in the motor housing and which is rotatably connected to a conical supporting disc supported on the motor shaft via the fluid cells, a diaphragm being disposed at the outer front side of the control head which, on the inner side, is under the flow pressure of the pressure medium flowing through the driving-side of the control head, and, on the other side, supports the control head against the supporting disc via a counter surface in the motor housing.

Abstract: A hydraulic piston type motor having a rotating piston barrel abutting a fixed porting plate or head with a starting charge device including a differential area piston operating to supply a limited hydrostatic pressure between the porting plate and rotating barrel to reduce starting friction and improve starting torque.

Abstract: A swash plate type axial piston pump having a valve plate along which a cylinder block slides. The valve plate has an intake port and a discharge port, respectively positioned on a small pitch circle. Oil passages are slanted extending from the intake port and the discharge port to a cylinder hole of the cylinder block of the piston pump, converging at an axial centerline of the cylinder block. Being different from the slanted oil passage, oil guide holes are formed extending from a bottom of the cylinder hole in parallel with a rotary shaft. Supplying pressed oil to the oil guide hole enables to decrease a pressure between the cylinder block and the valve plate.

Abstract: Two rotary shafts to transfer a motive power are relatively rotatably coupled. One of the shafts is coupled to a rotor and the other is coupled to a cam. A plurality of plungers which execute a stroke motion in the axial direction by the relative rotation with the cam are provided for the rotor. The oil injection and discharge into/from the plunger enclosing chamber are executed by a rotary valve. The rotary valve automatically switches a phase relation so as to obtain correct opening/closing timings even if the direction of the relative rotation changed. The rotary valve rotates integratedly with the cam side and opens or closes intake/discharge holes of the plungers for a plurality of intake ports and discharge ports which are alternately formed on the cam surface. The discharge ports on the front surface of the rotary valve are mutually coupled by communicating grooves formed on the back surface. An orifice is formed between the communicating groove and the intake port.

Abstract: An eccentric ring porting system for hydraulic pumps of the type having a rotating cylinder block. The rotating cylinder block has a flat annular port face with a small cluster of regularly spaced cylinder ports in the face circularly arrayed about the axis of rotation of the cylinder block. A ring valve element has a ring seat surface held flush against the cylinder port face. The axis of the ring seat surface is eccentrically offset from the axis of rotation of the cylinder block, and the cylinder ports are uncovered inside of the inner edge of the ring seat surface for output porting of the pump and outside of the outer edge of the ring seat surface for inlet porting of the pump.

Abstract: In an axial piston motor or pump the cylinder barrel is mounted on a medial shaft which has a shoulder which axially bears against the front end of the rotor barrel. The rear end of the medial shaft is radially borne in a housing portion. The front portion of the medial shaft is provided with a bearing member of an axial thrust bearing for support on a respective axial thrust bearing member in the housing. On the rear end of the rotary barrel an axially selfthrusting control body is provided to seal the flow of fluid to and from the cylinders of the rotary barrel. The control body presses against the rotary barrel, the rotary barrel presses against the shoulder of the medial shaft and the thrust bearing member of the shaft bears on the thrust bearing member of the housing. As a result thereof the cylinders in the rotary barrel can be straight through bores. The manufacturing of the rotor barrel is thereby simplified and the flow acceleration losses of former bore type cylinders are prevented.

Abstract: A control arrangement to control the flow of fluid through pumps, motors, transmissions, engines has an eccentric shoulder assembled into a respective thrust chamber in a portion of the housing to be pressed against the rotary seal face of the rotor of the device. Such arrangements are known from some of my earlier patents and have served satisfactorily, but with the desire to improve the pressures further, it has been found, that arrangements are required to prevent the control body from slight rotation, under which it otherwise would stick. The arrangement provides the means to prevent the rotation and sticking by defining a relationship between eccentricities and gravity centers in order to reduce the tendency to stick. Pins and pins with eccentric and adjustable portions are also used to prevent the tendency to stick and so are pluralities of eccentrically arranged individual thrust chambers and control body portions.

Abstract: A hydraulic differential having a pair of axial piston displacement units, with one being a fixed displacement unit, and the other being a variable displacement unit, and having flow-directing valve and port plates positioned therebetween. The hydraulic sealing of the components which rotate relative to each other is achieved by a floating mounting of a port plate which is urged by a block spring of the fixed displacement unit against an adjustable valve plate abutting a cylinder block of the variable displacement unit. The drive input for the hydraulic differential includes a rotatable mounting for the fixed angle wobbler of the fixed displacement unit which is drivingly connected through a connecting tubular member to the cylinder block of the variable displacement unit and with the cylinder block of the fixed displacement unit connected to a drive output shaft.

Abstract: In an axial piston motor or pump the cylinder barrel is mounted on a medial shaft which has a shoulder which axially bears against the front end of the rotor barrel. The rear end of the medial shaft is radially borne in a housing portion. The front portion of the medial shaft is provided with a bearing member of an axial thrust bearing for support on a respective axial thrust bearing member in the housing. On the rear end of the rotary barrel an axially selfthrusting control body is provided to seal the flow of fluid to and from the cylinders of the rotary barrel. The control body presses against the rotary barrel, the rotary barrel presses against the bearing of the medial shaft and the thrust bearing member of the shaft bears on the thrust bearing member of the housing. As a result thereof the cylinders in the rotary barrel can be straight through bores. The manufacturing of the rotor barrel is thereby simplified and the flow acceleration losses of former sack-bare bore type cylinders are prevented.

Abstract: A hydraulic transmission device operable to translate hydraulic energy into mechanical energy and vice versa. The device has a housing 14 having a close end portion and an open end portion in the longitudinal direction. The housing supports therein a drive shaft 11, a retainer 12, and a cylinder block 13 which have an integral structure. A recess is formed at a substantially central location of the end surface of the cylinder block 13 that is on the side of an open end of the housing, and a cover 15 closing the open end of the housing has a protruding portion 15A which extends through a port plate 23 to be engaged with the recess of the cylinder block through a bearing 17. A plurality of pistons are disposed in the cylinder block and are kept in tight engagement with a swash plate fixed to the closed end portion of the housing at a constant tilt angle. The device acts as either a swash plate type axial piston pump or motor of this type as the drive shaft rotates.

Abstract: A control arrangement to control the flow of fluid through pumps, motors, transmission, engines has an eccentric shoulder assembled into a respective thrust chamber in a portion of the housing to be pressed against the rotary seal face of the rotor of the device. Such arrangements are known from some of my earlier patents and have served satisfactorily, but with the desire to improve the pressures further, it has been found, that arrangements are required to prevent the control body from slight rotation, under which it otherwise would stick. The arrangement provides the means to prevent the rotation and sticking by defining a relationship between eccentricities and gravity centers in order to reduce the tendency to stick. Pins and pins with eccentric and adjustable portions are also used to prevent the tendency to stick and so are pluralities of eccentrically arranged individual thrust chambers and control body portions.

Abstract: The invention relates to a hydraulic motor, which comprises a surrounding frame casing; an internal cylinder block with radially arranged cylinders and a stationary axle of the hydraulic motor attached thereto; pistons reciprocating in the cylinders and bearing the inner surface of the frame casing, which surface is formed as a running surface guiding the movement of the pistons; a fluid distributor mounted around the axle to rotate together with the frame casing, for the distribution of the hydraulic fluid into cylinder chambers and away therefrom via openings provided in the cylinder block; and feed and exhaust channels for the hydraulic fluid. The object of the invention is to improve such a hydraulic motor by compensating, without complicated balancing elements, the force caused by the pressurized hydraulic fluid and separating the fluid distributor and the cylinder block.

Abstract: In an axial piston motor or pump the cylinder barrel is mounted on a medial shaft which has a shoulder which axially, bears against the front end of the rotor barrel. The rear end of the medial shaft is radially borne in a housing portion. The front portion of the medial shaft is provided with a bearing member of an axial thrust bearing for support on a respective axial thrust bearing member in the housing. On the rear end of the rotary barrel an axially selfthrusting control body is provided to seal the flow of fluid to and from the cylinders of the rotary barrel. The control body presses against the rotary barrel, the rotary barrel presses against the shoulder of the medial shaft and the thrust bearing member of the shaft bears on the thrust bearing member of the housing. As a result thereof the cylinders in the rotary barrel can be straight through bores. The manufacturing of the rotor barrel is thereby simplified and the flow acceleration losses of former bag bore type cylinders are prevented.

Abstract: The former art provides multi stroke hydrostatic motors, which perform at a single revolution of the rotor multiple inward and outward strokes of the pistons. A high torque was thereby obtained. The invention discovers, that the known multi stroke motors are still too heavy, obtain small overall efficiencies and their power per size and weight is limited because the known motors failed to provide means to carry the tangential loads by fluid pressure power. The invention increases the power and efficiency of multiple stroke motors by the provisions of control means to control the flow of fluid pressure into pockets open to the piston faces and cylinder walls, whereby the torque of the rotor is transferred from the pistons to the cylinder walls by pressure in fluid in the pockets.

Abstract: A fluid motor operable from a source of pressurized fluids such as compressed air or steam which includes a hollow stationary housing and a rotating housing journaled therein. A plurality of pistons are reciprocally, radially received in the rotating housing and act radially outwardly against an eccentric cam surface.

Abstract: A distributor for hydraulic motors, particularly radial-piston hydraulic motors, wherein an excellent hydraulic seal is provided in the area between the motor housing and the fluid distribution plate by the utilization of a tubular sleeve located in front of the distribution plate. At least two annular steps located on said sleeve which engage with corresponding annular steps on the housing provide such seal.

Abstract: A rotary machine usable as a pump, compressor, turbine or motor, for example. Rotating piston cylinders have radially movable pistons therein and the cylinders are mounted within a control ring and a housing. The control ring is tangentially pivoted within the housing to vary the volume flow through the machine and the torque application transmitted by a shaft, as well as the direction of flow through the machine. Pressure fluid operated balancing pistons are used to counter the axial thrust placed on the rotor by liquids applied to the rotor, regardless of the direction of flow through the machine.

Abstract: A rotary hydraulic pump or motor of the axial piston type, including a rotary cylinder block (17) formed with cylinders containing pistons (15). The block is formed with ports (25) which co-operate with ports (26, 27) in a distributor plate or valve plate (19). The cylinder block is free to move in an axial direction, but is prevented from tilting. The valve plate (19) is fixed in an axial direction, but is allowed to tilt by means of a spherical abutment (36). Adjustable sleeves (28) accommodate the movement of the valve plate and convey the fluid to and from the cylinders (16) in the block.

Abstract: An axial piston machine has a cylinder barrel mounted on a shaft and rotatable with respect to a portion of the casing. Between the cylinder block and the casing portion is a disc. The side of the disc adjacent the casing portion is concave and abutting casing portion is correspondingly convex. The disc is restrained against rotation and forms part of the valving means for the cylinder barrel. In one embodiment the casing and shaft are in two articulated sections. The shaft sections lie in a common plane and are pivotable with respect to each other about a point and the casing sections are pivotable about an axis normal to that plane and offset with respect to the shaft pivot point. In another embodiment the casing and shaft are each a single unit.

Abstract: The invention provides an axial piston pump/motor in which clearance at the port face between a stationary fluid distribution block and a rotating cylinder barrel is controlled in accordance with impedanced working fluid pressure applied to a hydrostatic bearing.

Abstract: In a rotary radial piston machine substantially axially extending passages are provided extending from the respective cylinders in axial direction through the rotor for directing the flow of fluid into and out of the rotor. A control body has entrance and exit passages and is located at least at one end of the rotor, and means are provided for obtaining a suitable clearance between a rotary control face of the rotor and a stationary control face of the stationary control body preferably including annular balancing chambers whose pressures act in axial direction on a sleeve guided on the rotor shaft and having an end abutting the control body.

Abstract: In a pump or motor having a plurality of radial pistons adapted to perform a plurality of strokes per revolution, a stator, a rotor and a fluid-distributor slide valve fast with the stator and having a radially extending plane face opposite a radially extending plane face of said rotor, said slide valve is provided in a chamber which communicates with the interface between said faces and, by a pressure-maintaining device, with a substantially unpressurised enclosure such that the effect on said slide valve of the pressure of fluid in said chamber will substantially balance the effect of pressure of fluid acting on said interface between said faces.

Abstract: An axial piston machine has a cylinder barrel mounted on a shaft and rotatable with respect to a portion of the casing. Between the cylinder block and the casing portion is a disc. The side of the disc adjacent the casing portion is concave and abutting casing portion is correspondingly convex. The disc is restrained against rotation and forms part of the valving means for the cylinder barrel. In one embodiment the casing and shaft are in two articulated sections. The shaft sections lie in a common plane and are pivotable with respect to each other about a point and the casing sections are pivotable about an axis normal to that plane and offset with respect to the shaft pivot point. In another embodiment the casing and shaft are each a single unit.