Abstract: A piston pump includes: a first biasing mechanism configured to bias a swash plate in accordance with control pressure supplied; a second biasing mechanism configured to bias the swash plate against the first biasing mechanism; and a regulator configured to control the control pressure in accordance with self-pressure of the piston pump. The regulator has: an outer spring and an inner spring configured to be extended and compressed by following tilting of the swash plate; a control spool configured to be moved in accordance with biasing forces exerted by the outer spring and the inner spring, the control spool being configured to adjust the control pressure; an auxiliary spring configured to exert biasing force to the control spool against the biasing forces exerted by the outer spring and the inner spring; and an adjusting mechanism configured to adjust the biasing force exerted by the auxiliary spring.

Abstract: A piston pump includes: a tilting mechanism configured to bias a swash plate in accordance with a control pressure; a support spring configured to support the swash plate; and a regulator configured to control a control pressure guided to the tilting mechanism in accordance with a self-pressure of the piston pump. The regulator has an outer spring and an inner spring configured to be extended and compressed by following tilting of the swash plate; and a control spool configured to be moved in accordance with a biasing force from the outer spring and the inner spring, the control spool being configured to regulate the control pressure, and the outer spring and the inner spring and the support spring are provided adjacent to each other and in parallel with respect to the swash plate.

Abstract: A hydraulic pump includes a cylinder block, a plurality of pistons, a swash plate, a first pressing unit, and a second pressing unit. The cylinder block has a plurality of cylinder bores and is disposed so as to be rotatable. Each of the plurality of pistons is retained in associated one of the cylinder bores so as to be movable. The swash plate is configured for controlling the amount of movement of the plurality of pistons in accordance with the size of the tilt angle. The first pressing unit is configured for pressing the swash plate in such a direction as to reduce the tilt angle of the swash plate. The second pressing unit is configured for pressing the swash plate in such a direction as to increase the tilt angle of the swash plate by a pressure supplied from the outside of the hydraulic pump.

Abstract: A swash-plate type piston pump includes a cylinder block configured to be rotated with rotation of a driving shaft, a plurality of pistons accommodated in a plurality of cylinders provided in the cylinder block, a swash plate configured to reciprocate the piston so that a volume chamber of the cylinder is expanded/contracted with the rotation of the cylinder block, an biasing mechanism configured to bias the swash plate in a direction where a tilting angle is made larger, a control pin configured to drive the swash plate in a direction where the tilting angle is made smaller in accordance with a rise in a load pressure of a pressure chamber, and a discharge channel configured to discharge the load pressure of the pressure chamber.

Abstract: A piston and cylinder assembly of an axial piston machine is disclosed which includes a cylinder having a uniform internal diameter, a cylindrical bushing press-fit against the inner surface of the cylinder and extending at least partially therein, the bushing comprising at least one circumferential groove formed on an outer surface of the bushing against the inner surface of the cylinder, a piston reciprocably disposed within the cylindrical bushing, generating a piston-bushing-interface, the piston and the bushing defining a diametrical clearance therebetween, the diametrical clearance defining a lubrication gap and a fluid-dynamic seal between the piston and the cylindrical bushing.

Abstract: A radial piston motor comprises cylinder-piston units arranged in a star shape, a housing, an output shaft, an inner axial housing collar, an outer axial shaft collar, an output flange, an output shaft, and a brake positioned at least in certain sections between the inner axial housing collar and the outer axial shaft collar. The output flange is attached to the output shaft. The output flange is attached to the shaft collar radially outside the shaft collar.

Abstract: An axial piston machine has a cylinder connected to a shaft and a multiplicity of pistons guided by the cylinder and supported by sliding shoes on a swashplate. Each sliding shoe has a sliding shoe collar and a sliding shoe head, and is held in place in a direction of a contact position by an annular retraction plate. An end face segment of the retraction plate engages an annular surface between the sliding shoe collar and the sliding shoe head, and each sliding shoe collar passes through an associated aperture in the retraction plate and connects to a corresponding piston. A surround is formed in the retraction plates at the head of each sliding shoe, and is configured to fit around an axial segment of a circumference of the sliding shoe head in a direction toward the swashplate.

Abstract: A hydraulic module with two inclined-axis drive systems. The hydraulic module comprises a yoke (1) which, by virtue of a pin (5) that is in active connection with a piston (6), is pivoted about a horizontal pivot axis (4) so as to adjust the stroke volume of the two inclined-axis drive systems.

Abstract: A reciprocator restraint assembly for a Z-crank axial piston machine is described. The assembly includes two gimbal arms each linked together at gimbal link joint that intersect at a point T. Point T lying in a medial plane M being defined as the plane passing through the point of coincidence of the crank and crankshaft axes to which the line that bisects the crank angle is normal. Each of the gimbal arms is pivotally mounted at an identical distance L from point T. A cylinder gimbal is pivotally mounted from the cylinder cluster and a reciprocator gimbal is pivotally mounted from the reciprocator. The reciprocator gimbal pivot axis is equidistant from point X and T as is the cylinder gimbal pivot axis.

Abstract: According to one embodiment, a radial fluid device includes a cylinder block having a plurality of radially extending cylinders, a plurality of pistons, and a cam disposed about the plurality of radially extending cylinders. A first linear control is coupled to the cam and operable to reposition the cam along a first axis. A second linear control is coupled to the cam and operable to reposition the cam along a second axis. A third linear control is coupled to the cam and operable to resist movement of the cam along a third axis.

Abstract: In a swash-plate type hydrostatic piston engine, a drive unit (10) and a swash plate (17) are received by a pot-shaped housing (1b). According to the invention, the pot-shaped housing (1b) is configured such that it is able to receive drive units (10a, 10b) of at least two rated quantities of a specific product series of the hydrostatic piston engine.

Abstract: A hydraulic system for use with a pressurized fluid includes a first cylinder and a second cylinder. A flow path links the first and second cylinders in fluid communication with each other. A first piston is disposed within the first cylinder and defines a first axis and a second piston disposed within the second cylinder. The first piston is movable along the first axis between a variety of operating positions and a rephasing position. The first piston has an exterior surface that defines a peripheral groove and several flutes. The flutes are oriented such that they are parallel to the first axis and intersect the peripheral groove, allowing the fluid to flow from the first cylinder across the flow path and into the second cylinder when the first piston is in the rephasing position thereby automatically rephasing the first and second pistons within the hydraulic system.

Abstract: The present invention provides a swash plate, for a swash plate compressor, which is excellent in a resistance to the occurrence of seizing in a condition where an extreme pressure is generated owing to local contact between the swash plate and a shoe which slides thereon and in a condition where lubricating oil is depleted, capable of preventing cavitation-caused erosion of a resin film when the swash plate is operated at a high surface pressure and a high speed in the presence of the lubricating oil and the swash plate compressor having the swash plate.

Abstract: RAPPs comprise a housing, a swash plate with an inclined surface, and a rotor assembly positioned adjacent the swash plate. The swash plate and/or the inclined surface are ceramic. The rotor assembly comprises a rotor-drum having at least one cylinder bore having a piston disposed therein, wherein the piston has a ball-shaped end. A slipper is interposed between the swash plate and the rotor-drum, and includes a socket joint for accommodating the piston ball-shaped end therein. A plastic material may be disposed within the socket joint. The slipper has a ceramic interface surface in contact with the inclined surface. A stator plate is positioned in the housing, and a rotor plate is interposed between the stator plate and the rotor-drum. The stator plate has a ceramic interface surface in contact with the rotor plate. The rotor plate has a ceramic interface surface in contact with the stator plate.

Abstract: Provided is a piston type compressor which can enhance cooling of internal parts housed in a crank chamber, while effectively reducing an outflow of oil to the outside of a compressor by effectively performing a centrifugal separating operation due to the rotation of a shaft. The compressor includes: a first suction path which directly introduces a working fluid flowed from a suction port 30 into suction chambers 27a, 27b without via the crank chamber 7; and a second suction path which introduces the working fluid flowed from the suction port 30 into the suction chambers 27a, 27b via the crank chamber 7, and the second suction path includes: an oil separation passage 32 where a working fluid is introduced into the suction chambers 27a, 27b from the crank chamber 7 via holes formed in the shaft; and a bypass passage 33 where the working fluid is introduced into the suction chambers 27a, 27b from the crank chamber 7 through the cylinder blocks 1, 2 without via the shaft 12.

Abstract: A pump has an axial drive shaft with a cam fence that extends radially outwardly from an axis of the drive shaft. The cam fence axially displaces, in respective cylinders, each of a plurality of elongate pistons arranged in parallel to and around the axis and angularly spaced apart from each other. The axial position of an outer margin of the cam fence varies as a function of its radial angle with the axis. In one part of the operation of the pump, a piston is withdrawn to uncover a radial inlet port to draw fluid into the cylinder from an internal reservoir volume formed in the drive shaft. In a second part of the operation, the drive shaft is further rotated to open a cylinder end port by means of a rotary valve and closing the side port of the cylinder with a portion of the drive shaft body. In a third part of the operation, the piston is advanced to push fluid out of the cylinder end port into an output chamber.

Abstract: A hydrostatic axial piston machine, in particular a swashplate machine, has a cylinder drum (3) mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The cylinder drum (3) is axially supported on a control surface (8) affixed to the casing and on which an inlet connection (10) and an outlet connection (11) are realized. The cylinder bores (4) can each be placed in communication by a connecting channel (12) with the control surface (8). The connecting channel (12) is provided with a cross-section that increases from the cylinder bore (4) toward the control surface (8).

Abstract: An axial piston machine includes a housing and pistons situated in cylinder bores of a rotatable cylinder member, which pistons are supported on a pivoting cradle, the pivoting cradle being supported via at least one pivoting bearing having a bearing gap that has fluid acting on it. The axial piston machine further includes a control and/or regulating device is provided for the control and/or regulation of the fluid pressure in the bearing gap.

Abstract: A low pressure fluid powered motor or pump comprises a non-rotatable cover (k); an undulating lobe cam track (e) attached to the cover (k) and defining multiple crests and troughs; a rotatable cylinder block (c); at least three reciprocating pistons (d) each housed within a bore of the cylinder block (c) and each providing at one end a crown (d1), and at the other end a spherical seating cup (d2); a ball (f), adapted to engage with the cam track (e); a non-rotatable manifold block (n) incorporating a plurality of ports (s), each being radially disposed at equal intervals in an end face of the manifold block adjacent the pistons (d), with the ports (s) linked to galleries connected to a higher pressure delivery circuit, and a lower pressure return circuit, with the angular arrangement of the ports (s) being such that the higher pressure is supplied to the crown (d1) of each piston (d) only while the piston (d) is moving from a crest to a trough of the cam track (e), with a switch to the lower fluid pressure ci

Abstract: A hydrostatic axial piston machine utilizing a swashplate design has a cylinder drum (3) that is mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The pistons (5) are each supported on a swashplate (7) by a sliding element (6). Between the piston (5) and the cylinder bore (4), there is at least one annular groove (20; 20a, 20b) which is located in the area of the inner half (LFi) of the guided length (LF), such as the minimum guided length (LF) of the piston (5) in the cylinder bore (4).

Abstract: A bent axis hydromodule that has a yoke that is rotatable about trunnions and rotating kits having rotating kit shafts that are in fluid communication with the yoke. Servo piston porting is integrated within the yoke and positioned about the trunnion such that servo pistons are in fluid communication with the servo piston porting and operable to rotate the yoke about a trunnion axis.

Abstract: An axial piston fluid engine having single-acting cylinders incorporating swivel-joint attachment of the cylinders to rotary control valves wherein straight-line piston movement is established for the elimination of side forces on the pistons. The pistons and the control valves are operatively connected to a common wobble drive member and arranged in geometry of lever positions to coactively time the drive fluid into and out of the cylinders intermittently.

Abstract: In a hydraulic rotary machine having rotational shaft provided within a casing a rotational shaft, a cylinder block rotationally interlocked with the rotational shaft and formed with a plural number of cylinder bores, and pistons slidably received in the cylinder bores and adapted to slide back and forth within the cylinder bores while the rotational shaft and the cylinder block are put in rotation in synchronism with each other, a multitude of minute pits are formed at least either on sliding surfaces on the side of the cylinder bores, each one of the minute pits are in an elliptical shape defining a moderately sloped surface in one side and an acutely sloped surface in the other side, and the moderately sloped surfaces of the minute pits are oriented to face a direction in which said pistons are put in sliding movement in said cylinder bores under a greater load than in the other direction.

Abstract: An axial piston machine utilizing a swashplate design has a cylinder drum (3) that is mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The pistons (5) are each supported by a sliding shoe (7) on a swashplate (8). The sliding shoes (7) are in a functional connection by means of a retaining device (16), in particular a retaining plate (15), that rotates synchronously with the cylinder drum (3). The sliding shoes (7) are in a functional connection with a moment generating device (25), by means of which an opposing moment can be generated on the sliding shoes (7) that counteracts the tipping moment.

Abstract: The invention relates to an axial piston machine, in addition to a swash-plate for said machine and a method for producing a swash-plate. The swash-plate (24) is configured as a disc and has a central bore (32), which is encompassed by a collar (39), extending in an axial direction from a first surface (34, 34?) of the swash-plate (24). In addition, the swash-plate (24) has several sliding block receiving openings (36), each of the latter (36) being encompassed by a guide collar (38), which extends in an axial direction from a second surface of the swash-plate (24), in the opposite direction to the collar (39) of the central bore (32).

Abstract: Motor start circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding (4) and an auxiliary winding (5), which are supplied with current, particularly alternating current, via current supply connections (24, 25), and with a start switching device (15) serving the purpose of interrupting the current flow through the auxiliary winding (5) after the start of the motor, the start switching device (15) being connected to a control device (20) via a connector (18), the control device (20) being connected between the current supply connections (24, 25), and with a winding protection switch (28), which is normally closed and which opens on the occurrence of a fault. The invention is characterized in that the control device (20) is connected to the winding protection switch (28) via at least one further connector (22, 17), preferably via at least one further connector (22, 17) and the auxiliary winding (5).

Abstract: The invention relates to an axial piston machine, in addition to a swash-plate for said machine and a method for producing a swash-plate. The swash-plate (24) is configured as a disc and has a central bore (32), which is encompassed by a collar (39), extending in an axial direction from a first surface (34, 34?) of the swash-plate (24). In addition, the swash-plate (24) has several sliding block receiving openings (36), each of the latter (36) being encompassed by a guide collar (38), which extends in an axial direction from a second surface of the swash-plate (24), in the opposite direction to the collar (39) of the central bore (32).

Abstract: A rotary reciprocating pump comprises: i) a pump housing having intake and discharge ports; a shaft driven rotary piston carder, rotatably carrying pistons circularly arranged therearound; ii) a driven rotary cylinder block having a plurality of cylinder bores therein, circularly arranged therearound for reception of the pistons, and having a flat outer side portion having an intake/discharge port therethrough communicating with the cylinder bores; iii) a stationary sloping inner control surface portion in sliding proximity with the outer side portion of the rotating cylinder block, the control surface portion configured so that the cylinder block moves outwardly for intake and inwardly for discharge, the control surface portion also having grooved openings therethrough to appropriately communicate with the ports to the bore through the cylinder block and with the intake and discharge ports in the pump housing; and, iv) a spring biasing the cylinder blocks towards the control surface portion.

Abstract: The invention relates to an axial piston machine comprising a swivel cradle (5), the inclination of which can be modified in relation to a rotational axis of a cylinder drum. A regulation system acts on the swivel cradle, said system comprising a first regulator (10) for adjusting the inclination of the swivel cradle (5) in a first displacement direction and a second regulator (35) for adjusting the inclination of the swivel cradle (5) in an opposite second displacement direction. The first and second regulators (10, 35) are located on opposite sides of the swivel cradle (5) in relation to the rotational axis. The axial piston machine also has a device for limiting the displacement of the swivel cradle. The device for limiting the displacement of the swivel cradle (5) comprises a first settable limiting device (39). The two limiting device (25, 39) act on the swivel cradle (5) and are located on opposite sides of the swivel cradle (5) in relation to the rotational axis.

Abstract: An axial piston machine (1) has a swashplate construction with work pistons (6) located longitudinally in a cylinder drum (4), each supported by a sliding block (8) on a swashplate (11). The sliding blocks (8) are secured against lifting up from the swashplate (11) by a retaining plate (13) that rotates in rotational synchronization with the cylinder drum (4). The retaining plate (13) is fixed in position in the axial direction by a retaining device (15). The retaining device (15) can be a groove-shaped recess (16) in the swashplate (11), into which the retaining plate (13) can be inserted. Or, the retaining device (15) can be formed by a plate-shaped component (30) inserted into a groove-shaped housing recess (31) on the housing (1), with which the retaining plate (13) can be placed in contact.

Abstract: A pump/compressor that utilizes a wedge at a fixed angle to operate the pump's pistons at a fixed stroke. Alternatively the wedge can be moved axially to increase or decrease the clearance volume. Variable fluid flow at any clearance volume is achieved by rotating the wedge with respect to the port plate thereby changing the timing of the pistons with respect to the fixed port plate which changes the timing of the intake and output cycles. This results in a portion of the intake charge being breathed back into the intake port and a portion of the output charge being breathed back from the outlet port. This causes the pistons to not take in a full charge from the inlet port and to not pump out a full charge into the outlet port. Thus, fluid flow is varied. The design results in a smaller pump as the wedge is supported by the pump housing rather than a mechanical linkage required of prior adjustable angle swashplate designs.

Abstract: A bent axis pump wherein the coupling between a cylinder body and a connecting pin of a back body takes place by the interposition of a bush suitable for guiding the rotation of the cylinder body limiting the friction between the cylinder body and the pin. The pin life is considerably extended.

Abstract: A hydrostatic drive axle has two hydrostatic axial piston motors utilizing a swashplate design located coaxially next to each other, the control sides of which face each other. Tubular terminal segments (1a) of the drive axle are in the form of axial piston motors (2) and are shaped and fitted on a center segment (1b), in which there is a control base seat (3) that is common to the two axial piston motors (2). To make possible easy assembly and disassembly, the control base seat (3) is shaped and fitted in the center segment.

Abstract: The invention relates to a hydrostatic axial piston machine having a cylinder block which can be rotated about a first axis, the cylinder block being provided with a plurality of cylinder bores which extend in the axial direction and which are arranged on a partial circle which is concentric in relation to the first axis, in addition to a plane which can be rotated about a second axis, whereon a number of pistons associated with the bores, can be articulated in a pivotable manner on a second partial circle which is concentric in relation to the second axis and form a ring. Also provided is a device for synchronizing the rotation of the cylinder block about the first axis and the drive shaft about the second axis. The cylinder block and the drive shaft can be adjusted in a continuous manner using both axes, between a first position, wherein both axes are parallel, and a second position, wherein both axes together form a maximum pivoting angle which is different from zero.

Abstract: The invention relates to an axial position machine (1) comprising cylinder bores (9) that are located in a cylinder drum (4), pistons (10) that can be axially displaced in said boxes (9) and helical compression springs (22) that are provided in the cylinder bores (9). Each piston (10) is pre-stressed against a swash plate (22), which is supported on the cylinder drum (4). The diameter of the helical compression spring (22) narrows (23) between the upper and lower ends.

Abstract: A hydraulic machine having a housing, a cylinder block located in the housing and having axial pistons slidably movable in cylinders, a shaft rotationally connected to the cylinder block, and a swash plate in load engagement with the pistons of the cylinder block. The swash plate is pivotally mounted in the housing by at least one bearing, such that said swash plate is pivotally adjustable about a kinematic axis to alter a hydraulic displacement of the pistons in the cylinder block. The thrust pistons are located between the swash plate and the housing so as to urge the swash plate toward the cylinder block.

Abstract: An axial piston machine includes a housing and pistons situated in cylinder bores of a rotatable cylinder member, which pistons are supported on a pivoting cradle, the pivoting cradle being supported via at least one pivoting bearing having a bearing gap that has fluid acting on it. The axial piston machine further includes a control and/or regulating device is provided for the control and/or regulation of the fluid pressure in the bearing gap.

Abstract: A holddown pin mechanism for hydraulic power units is a ball guide with a cylindrical flat base having a central opening, a plurality of spaced elongated holddown pins have one end rigidly secured to one side of said ball guide. The pins extend outwardly at right angles from the side of said washer to which they are secured. The holddown pin mechanism is placed in a hydraulic cylinder block having a center bore, with the pins extending into holes in the block. A flat washer on a shaft extending through the block engages the free ends of the pins.

Abstract: In a swash plate hydraulic pump or motor structured so that a convex arc surface on the back surface of a swash plate is supported on a concave arc surface of a swash plate support via a bearing in a manner enabling the arc surface to swing in the circumferential direction that follows the arc path. A restricting pin is included for restricting movements of the bearing. The assembly structure prevents the restricting pin from coming out of the swash plate and the swash plate support. One end of the restricting pin is supported rotatably on a side surface of the swash plate. An intermediate portion of the restricting pin is engaged in an engagement hole formed in a holder of the bearing in a loosely fitting manner. Finally, the other end of the restricting pin is inserted into a support rod supported rotatably around its axis on the swash plate support to permit movement of the restricting pin in a pin axial direction.

Abstract: A hydrostatic axial piston machine, in particular a swashplate machine, has a cylinder drum (3) mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The cylinder drum (3) is axially supported on a control surface (8) affixed to the casing and on which an inlet connection (10) and an outlet connection (11) are realized. The cylinder bores (4) can each be placed in communication by a connecting channel (12) with the control surface (8). The connecting channel (12) is provided with a cross-section that increases from the cylinder bore (4) toward the control surface (8).

Abstract: An axial piston machine utilizing a swashplate design has a cylinder drum (3) that is mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The pistons (5) are each supported by a sliding shoe (7) on a swashplate (8). The sliding shoes (7) are in a functional connection by means of a retaining device (16), in particular a retaining plate (15), that rotates synchronously with the cylinder drum (3). The sliding shoes (7) are in a functional connection with a moment generating device (25), by means of which an opposing moment can be generated on the sliding shoes (7) that counteracts the tipping moment.

Abstract: A hydrostatic axial piston machine utilizing a swashplate design has a cylinder drum (3) that is mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The pistons (5) are each supported on a swashplate (7) by a sliding element (6). Between the piston (5) and the cylinder bore (4), there is at least one annular groove (20; 20a, 20b) which is located in the area of the inner half (LFi) of the guided length (LF), such as the minimum guided length (LF) of the piston (5) in the cylinder bore (4).

Abstract: A pump having an endplate with an orifice provided between the system ports and the charge pump pressure cavity. Fluid flows through the orifice so as to soften a transition of the vehicle from a stationary position to a forward or reverse motion when a swash plate of the pump is angled slightly relative to a neutral or zero position.

Abstract: A displacer unit with a valve plate body is disclosed. The displacer unit having at least one displacer space which is arranged in a cylindrical drum rotating about an axis of rotation and which can be connected to an inlet connection and an outlet connection by means of a control surface. The control surface is formed on a valve plate body which is provided with a first control opening, which is connected to the inlet connection, and with a second control opening, which is connected to the outlet connection. The first control opening and the second control opening are spaced apart radially, where the displacer space can be connected to the first control opening by a first connecting passage and to the second control opening by a second connecting passage. The connecting passages are provided with a respective mechanical face seal for sealing relative to the control openings.

Abstract: The invention relates to an axial position machine (1) comprising cylinder bores (9) that are located in a cylinder drum (4), pistons (10) that can be axially displaced in said boxes (9) and helical compression springs (22) that are provided in the cylinder bores (9). Each piston (10) is pre-stressed against a swash plate (22), which is supported on the cylinder drum (4). The diameter of the helical compression spring (22) narrows (23) between the upper and lower ends.

Abstract: The present disclosure presents several embodiments for metering devices some of which also have pumping capability. The devices utilize one or more pistons located within a cylindrical rotor. As the cylindrical rotor is turned by a suitable torque/power source, a first face of each piston is exposed to an inlet supplying a fluid to be metered. The piston is then moved within the associated channel or bore within the rotor, allowing the volume of the channel to be filled with fluid. The continuing rotation of the rotor then removes the piston from the fluid supply and moves the channel through an angular displacement. The piston is then moved—either through applied power for active pistons or the force of the fluid supply for passive pistons—in the opposite direction, forcing the fluid out of the channel. In this way, a precise amount of fluid can be metered from each channel.

Abstract: The invention relates to an axial piston machine (1) comprising a housing (2) in which a drive disk (7) and a cylinder block (12) axially disposed next to it are received so as to be rotatable relative to each other about longitudinal center axes (11, 13). These axes run obliquely at an angle (W1) relative to each other in an oblique axis plane (E). A cam disk (18) is disposed on the front of the cylinder block (12) facing away from the drive disk (17) and is supported on the housing (2) by means of a positioning device (19) with positively engaging positioning elements (19a, 19b). A guide element (21) having a guide center axis (22) running coaxially to the longitudinal center axis (13) of the cylinder block (12) is disposed on the side facing the cylinder block (12).

Abstract: The hydraulic machine having axial pistons comprises: a cylinder block mounted to rotate about a first axis of rotation; and a swash plate supporting a sliding disk in rotation about a second axis of rotation which is inclined relative to the first axis of rotation. Coupling rods are connected to the pistons via first spherical joints and to the sliding disk via second spherical joints. For each coupling rod, a synchronization system for providing synchronization between the cylinder block and the sliding disk has two drive surfaces stationary respectively relative to the coupling rod and relative to the sliding disk, the second drive surface being off-center relative to the second spherical joint of the rod, such that a reference amount of clearance between said second drive surface and a first drive surface is small in the zone in which said surfaces come into contact at the time of synchronization in the preferred direction of rotation.

Abstract: A multiple-stroke hydrostatic axial piston machine has a plurality of piston-shaped displacement bodies (13) that can each move longitudinally in a displacement chamber (12) and are each supported by a roller body on a track (9) that is provided with axial cams (10) that generate a reciprocal motion. Each of the roller bodies is a roller (14) which is located in a recess (A) of the displacement body (13) that restricts radial and axial relative movements of the roller (14) with respect to the displacement body (13). The displacement body (13) can be configured as a cage of the roller (14).

Abstract: The present invention relates to a device for reducing energy losses in a machinery unit (1), having at least one part (4) which is arranged to rotate in fluid about a rotation axis (6) in a substantially closed chamber (3) delimited in the radially outward direction by means of a wall (18) extending around the rotation axis. The wall (18) has a radially inward facing wall surface (10) extending wholly or partially around the revolution, which wall surface is highly smooth and extends close to, but with an interspace (14) to the radially outer surface which is generated around the revolution by the rotary part (4). The interspace is suited to minimizing the rotating fluid volume and, at the same time, maintaining necessary width for a boundary layer in the fluid between the generated surface and the wall surface.