Abstract: The arrangement comprises a hydraulic machine with at least two operating cylinders, the hydraulic machine comprising a rotor part configured to be connected to the steered wheel and a stator part having main enclosures open in a receiving interface, and a pivot device that defines a pivot axis of the stator part and has main outer orifices linked to the main enclosures of the hydraulic machine in a connection interface. The arrangement further comprises a pilot line linked to a pilot chamber which has a pilot inlet in the receiving interface and the pilot line is formed in the pivot device and extends between an outer pilot orifice present in this device and a pilot opening located in the connection interface.

Abstract: A hydraulic radial piston device includes a housing, a pintle having a pintle shaft, a rotor mounted on the pintle shaft and defining a plurality of cylinders, and a plurality of pistons displaceable in the cylinders. The radial piston device further includes a piston ring that provides an interface for the pistons. The radial piston device includes various configurations for improving the performance and efficiency of the device.

Abstract: The invention relates to a valve assembly (50) of a radial piston hydraulic apparatus (1). Said apparatus includes a cylinder block (4) insertable onto a shaft (2) by translation. Said assembly (50) includes: a valve (51) in contact with said cylinder block (4); a valve train cover (52); and a first (541) and second (542) chamber that are defined, respectively, by a first (511, 521) and second (512, 522) space that are located at the interface between said valve (51) and said valve train cover (52), and are intended for the pressurized fluids that enable the conversion of pressure and/or mechanical stress. Said assembly (50) includes an additional section (54) defined by a third space (541, 542) located at the interface between said valve (51) and said valve train cover (52). Said section (54) is intended for receiving a pressurized fluid such as to enable the cylinder block (4) to be inserted onto the shaft (2).

Abstract: The device comprises a casing portion that has an open axial end and that has two main holes, respectively for fluid feed and for fluid discharge. Said holes open out in an inside axial face of the casing portion, respectively via a first main orifice and via a second main orifice that are disposed in succession in the direction going away from the open axial end. The inside axial face has first, second, and third sealing inside bearing surface arrangements, respectively situated between the open axial end and the first main orifice, between the two main orifices, and beyond the second main orifice. At least two of the three arrangements are staggered inside arrangements, each of which comprises two axial bearing surfaces that are staggered relative to each other, and that are separated by a shoulder facing towards the open axial end.

Abstract: Cam follower roller device, notably for an internal combustion engine fuel injection pump, comprising a tappet (12) and a roller (14) mounted to rotate on the tappet and intended to press against a cam. The tappet (12) comprises a roller support body (16), a shaft (26) for mounting the roller on the said body, and a guide sleeve (18) attached to the support body and at least partially surrounding the said body. The ends of the shaft are fixed in through-holes in the support body.

Abstract: A radial thermal engine with an improved valve system is disclosed herein comprising intake and exhaust port valve assemblies fluidly connected to respective intake and exhaust ports contained within a cylinder head assembly. Each intake and each exhaust port valve assembly comprises at least one rotatable port cover having spaced apart openings which are periodically alignable to the intake and exhaust ports, respectively.

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 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: The present invention relates to a system comprising: a shaft having a distal end and a proximal end; a casing defining a housing in which a hydraulic device is rotatably mounted on the shaft; and a sealing element comprising a low pressure dynamic sealing means and a reinforced dynamic sealing means formed by a static seal tightly mounted on a friction pad, such as to isolate the dynamic sealing means from the rotating hydraulic device, said sealing element defining a discharge chamber between the dynamic sealing means and the reinforced dynamic sealing means, which discharge chamber is connected to a drain via a pipe arranged on the surface of the shaft, between the hydraulic device and the shaft, so as to discharge the fluid located in the discharge chamber, such that said discharge chamber is not subjected to the pressure in the casing of the hydraulic device.

Abstract: A multi-piston motor/pump is disclosed particularly useful for air motor applications incorporating a cylinder block having a plurality of radially extending pistons and cylinders. Each cylinder is provided with a bronze insert at the top of the cylinder having an intake and exhaust port therein. Rotary valves are mounted on an output shaft and include axial flanges having openings therein that align with the input or exhaust openings in each cylinder. As the rotary valves rotate, the openings therein sequentially align with the input/exhaust ports provided in the bronze inserts such that air or fluid entering each cylinder enters axially of the cylinder. A center mounting plate is secured to the cylinder block and separates the input ports from the exhaust ports to enable fluid flow into the input ports and exhaust from the exhaust ports while isolating each port from the adjacent port in each cylinder.

Abstract: The invention relates to a radial piston hydraulic motor. The radial piston hydraulic motor comprises a cam ring provided, with a wave-shaped inner surface and radial cylinders provided in the inner part inside the cam ring and pistons that move therein as well as rollers coupled to the pistons so as to follow the inner surface of the cam ring. By the effect of the working pressure of hydraulic oil conveyed to the cylinders, the rollers that are pressed against the inner surface of the cam ring provide a rotating movement of the cam ring and the inner part relative to each other. The hydraulic motor is provided with disengaging members disengaging the rollers coupled to the pistons from contact to the inner surface of the cam ring when the working pressure stops acting in the cylinders for bringing the hydraulic motor into freewheeling.

Abstract: A hydraulic machine has a cylinder body with first and second ports and a plurality of cylinder bores disposed radially with openings through a side surface. Deformation regions, formed around each cylinder bore opening, expand and contract in response to pressure changes in the cylinder bores. A continuous band extends around the cylinder body closing the cylinder bore openings and applying a pre-stress compressive force to each deformation region. A plurality of pistons are slideably received in the plurality of cylinder bores and a plurality of valve arrangement couple the cylinder bores to the first and second ports. A shaft with an eccentric cam drives the pistons to slide within the cylinder bores. Each deformation region distorts in response to pressure in the associated cylinder bore wherein the circumference of that cylinder bore becomes more circular as the cylinder pressure increases.

Abstract: A hydrostatic positive displacement machine has a cylinder drum (4) located in a housing (9) and rotatable around an axis of rotation (2). During rotation of the cylinder drum (4), a piston bore (5) is placed in alternating communication with an inlet side (E) and an outlet side (A). The inlet side (E) and outlet side (A) comprise connections (21; 22) to a control plate (12). A reversing device (30) is located in a reversing area (25; 26) between the connections (21, 22) on the control plate (12). The reversing device (30) damps the pressure adjustment between a displacement chamber (V) and the pressure present in the connection (21; 22). The reversing device (30) includes at least two flow connections which are actuated simultaneously by the displacement chamber (V) as it moves along the reversing area (25; 26).

Abstract: A hydrostatic radial piston machine includes a radial cylinder block with cylinder bores which extend from an outer circumferential surface of the radial cylinder block into an interior of the radial cylinder block a number of pistons which corresponds to the number of cylinder bores; a cam ring and ends of the pistons which face away from the radial cylinder piston block are supported movably on an inner circumferential surface of the radial cylinder block during a rotation of the radial cylinder block; two control plate elements which extend respectively with a face oriented towards the radial cylinder block towards a central plane of the radial cylinder block, which central plane is perpendicular to the rotation axis. Each control plate element includes a bearing portion in which radially acting forces are transferable to a respective mating surface in the housing or housing cover mounted in the housing.

Abstract: A control device for controlling a speed of a hydraulic motor includes a housing defining a first void. A speed valve is disposed within the first void and is moveable between a first speed valve position and a second speed valve position. The first void includes a speed valve pressure chamber disposed at one end of the speed valve. A speed valve spring is disposed at another end of the speed valve. The housing further defines a speed change port and a speed change passage interconnecting the speed change port and the speed change pressure chamber for directing a pressurized fluid directly into the speed valve pressure chamber to exert a pressure force on the speed valve and bias against the speed valve spring to move the speed valve between the first speed valve position and the second speed valve position.

Abstract: A fluid machine with radial cylinders, includes cylinders being fixed with respect to a body wherein the cylinders are peripherally spaced in a rotation plane of a crank rotating with a driving shaft of the machine, elements distributing a fluid, a piston of each cylinder placed in contact with a surface of the crank by a sliding member, the piston of each cylinder being placed within a jacket of the cylinder with contact of a side surface of the piston in a guide and sealing area which is small with respect to the side surface of the piston, and for a guide function an annular edge is present and projecting from an inner surface of the jacket, and for a sealing function a sealing ring is present on the jacket and housed in an annular slot which is parallel and attached to the annular edge, and rings maintaining the contact between the pistons and the crank.

Abstract: A fluid-working machine comprises at least one primary working chamber such as a cylinder (4) of cyclically changing volume and primary valves (7) to control the connection of the at least one chamber to low (10)- and high (9)-pressure manifolds. The machine has at least one secondary working chamber (5) of cyclically changing volume and a secondary valve (12, 21) for placing the secondary chamber in communication with the primary chamber (4) in an active state of the secondary chamber (5) and for isolating it therefrom in an idling state of the secondary chamber.

Abstract: A radial thermal engine with an improved valve system is disclosed herein comprising intake and exhaust port valve assemblies fluidly connected to respective intake and exhaust ports contained within a cylinder head assembly. Each intake and each exhaust port valve assembly comprises at least one rotatable port cover having spaced apart openings which are periodically alignable to the intake and exhaust ports, respectively.

Abstract: To avoid having to strip down a radial piston engine (1) into its individual components when it is disassembled, a rotary cylinder (5) has a collar (19) on which the rotary cylinder is supported against the cam disk (2), the cam disk (2) being rotationally fixed in position to a housing portion (13).

Abstract: The invention relates to a hydraulic group comprising a reservoir (28) for oil, in which a multiple piston pump (60) is arranged. The individual pumps (61) are cyclically driven by an eccentric ring (29). In order to ensure a permanent immersion of the individual pumps in the reservoir (28), an auxiliary reservoir (47) providing oil for refilling the reservoir (28) is arranged above the reservoir. The auxiliary reservoir (47) is connected to an additional tank (45) by means of a connection line (48).

Abstract: The present invention provides a fluid system (99) comprising a source of hydraulic fluid under pressure supplying a hydraulic fluid consumer (103) together with a valve passing fluid between said source and said fluid consumer (102). A first fluid compliance (105) is situated between said source (100) and said valve (102) and a variable restrictor (110) is provided for varying the cross sectional area available for flow of fluid through said valve (102) and is movable between a first position (A) with a larger said area and a second position (B) with a smaller said area. A bias means (117) biases said restrictor (110) towards said second position whilst an opening means (Fa) urges said restrictor (110) against said bias (117) when fluid flows through said valve (102) and a damping means (126) damps movement of said restrictor between said first and second positions and provides a resistance which increases with the velocity of displacement of said restrictor (110).

Abstract: A hydraulic machine arrangement includes at least one hydraulic machine having a plurality of pistons reciprocating within corresponding cylinders. The pistons can be driven by a cam to operate the hydraulic machine as a pump, and they can drive the cam to operate the hydraulic machine as a motor. The hydraulic machine can be configured to selectively disengage a certain piston or pistons from the cam to operate at less than full displacement. Controlling the pressure in the cylinders corresponding to the disengaged pistons can be accomplished by a number of mechanisms, including selectively exhausting fluid from the cylinders, or using a jet pump to siphon off some of the fluid from a high pressure side of the hydraulic machine. Two of the hydraulic machines can be mounted together to help balance axial forces and eliminate the need for an expensive high capacity thrust bearing.

Abstract: A high efficiency diametrically compact, radial oriented piston hydraulic machine includes a cylinder block with a plurality of cylinders coupled to a first port by a first valve and to a second port by a second valve. A drive shaft with an eccentric cam, is rotatably received in the cylinder block and a cam bearing extend around the eccentric cam. A separate piston is slideably received in each cylinder. A piston rod is coupled at one end to the piston and a curved shoe at the other end abuts the cam bearing. The curved shoe distributes force from the piston rod onto a relatively large area of the cam bearing and a retaining ring holds each shoe against the cam bearing. The cylinder block has opposing ends with a side surface there between through which every cylinder opens. A band engages the side surface closing the openings of the cylinders.

Abstract: A hydraulic regenerative braking system and method for a vehicle include a variable displacement hydraulic machine operable as a pump or a motor (22). The hydraulic machine facilitates connections between some of its piston cylinders (50, 52) and a low pressure source (32), and some other of its piston cylinders (50, 52) and a high pressure source (28). The cylinders are alternately connected to the high and low pressure sources such that a pressure transition occurs during each piston stroke. By controlling where in a piston stroke the transitions occur, the power of the hydraulic machine can be modulated. The hydraulic machine is configured to effect the pressure transitions in only a portion of the cylinders at one time. This can be accomplished by asymmetrically configuring cam lobes (86, 88, 90) and fluid ports (74, 76, 78, 80, 82, 84). Staggering the pressure transitions helps to inhibit flow disturbances in the machine when it is operating at less than full displacement.

Abstract: A hydraulic mechanism including a cylinder block having radial pistons and mounted to rotate in a stationary casing, and a distribution cover that forms a portion of the casing that has feed and discharge ducts that extend between an outside face and inside of face of the cover. The internal distributor has distribution ducts that are selectively connected to the feed and discharge ducts that open out into a distribution face that is perpendicular to the axis of rotation and that is disposed against the communication face of the cylinder block so as to cause the distribution ducts to communicate with the cylinder ducts. In a zone defined radially outwards by end-wall portions of the cylinders, a transverse face of the cylinder block is provided with an axial setback in which at least a portion of the distributor is disposed.

Abstract: A stepper motor suitable for use in a medical imaging environment has (a) a cylindrical central gear having an external surface with circumferentially distributed and radially directed teeth, (b) a shaft for mounting the central gear such that it is constrained to move in rotational motion about its centerline, (c) a cylindrical hoop gear having a bore with an internal surface having circumferentially distributed and radially directed teeth, (d) level arm crank mechanisms for mounting the hoop gear such that it is constrained to move in translational-circular motion about the central gear's centerline, wherein this central gear is further configured to fit within the hoop gear's bore in such a manner that a plurality of the central gear and hoop gear teeth intermesh and cooperate so that the planetary movement of the hoop gear causes the central gear to rotate, and (e) piston mechanisms for applying a fluid pressure driven force to specified points on the hoop gear so as to cause its movement.

Abstract: A hydraulic apparatus comprises a housing having a central axis; a plurality of radially-oriented piston-cylinder assemblies each including a cylinder supported by the housing and a piston movable within the cylinder, the piston separating radially inner and outer chambers within the cylinder; and valving and associated flow passages for individually controlling the flow of hydraulic fluid to and from the radially inner and outer chambers of each piston-cylinder assembly. The piston-cylinder assemblies are mounted to the housing for pivotal movement by trunnions provided with flow passages for connecting the piston-cylinder assemblies to inlet and outlet ports via the valving and porting.

Abstract: A motor having two series of distribution ducts each having two groups of ducts. The displacement selector is able to occupy a large displacement position in which the first groups of distribution ducts of the first series are connected to a main duct while the second groups are connected to the other main duct, and a small displacement configuration in which the first group of distribution ducts of the first series is connected to a main duct, the second group of distribution ducts of the first series is connected to the other main duct and a bypass connection exists between the first and the second group of distribution ducts of the second series. The device has a restriction in order, in the small displacement configuration, to restrict this bypass connection.

Abstract: A Hybrid Piston/Rotary engine has a stationary elliptical housing with a circumscribed inner cam surface to provide thrust, and sides with bearing supports for rotation of a rotor, at least one cylinder, a shaft with apertures therein to provide rotary valves combined with intake and exhaust ports within the bearing supports. Each cylinder has two opposed pistons connecting cam followers pivoted to the rotor which reciprocate upon rotation. During the intake stroke, the pistons separate as an intake valve opens; and fuel mixture fills the cylinder and closes as pistons compress the mixture. The rotor ports become aligned with the spark plugs within the bearing supports, and ignited gasses force the pistons apart causing the cam followers to provide thrust to the rotor. The exhaust valve is opened as the pistons contract. Four strokes are completed each rotation. The valves can also be arranged to operate as a pump.

Abstract: A hydraulic positive-displacement machine includes at least two radially or axially spaced-apart groups of cylinder-piston units. The cylinders of the primary group can be made to communicate fluidically with cylinders of the secondary group via intermediate valves. At least two intermediate valves can be switched independently of one another.

Abstract: A hydraulic motor device including a hydraulic motor having a cylinder block and a cam that are mounted to move in rotation relative to each other. The motor has a fluid distributor for the cylinders, a portion of which distributor is constrained in rotation with the cam, and a stationary distribution coupling connecting the distributor to a fluid feed and to a fluid discharge. The motor has a through passage disposed along the axis of rotation for the purpose of receiving a transmission shaft segment. The motor can be declutched by radially uncoupling the pistons from the cam, the cylinder block remaining stationary relative to the reference frame of the vehicle, and the cam being constrained in rotation with a transmission shaft segment that is disposed in the through passage. The device may be used in addition to or as a replacement for a mechanical transmission.

Abstract: A rotary heat engine has a cylindrical engine block containing a rotor with four equally spaced pistons and corresponding cylinders extending radially in the rotor. The pistons are pivotally connected to connecting rods that are in turn connected to a shaft at an inner end of each connecting rod. The engine block has a cover thereon and the block can have heating and cooling locations that create heating and cooling chambers within the rotor, thereby causing the pistons to reciprocate and causing the rotor to rotate within the engine block. The pistons reciprocate within the rotor while the rotor rotates within the engine block.

Abstract: In order to ensure that a radial piston engine (1) is not dismantled into the individual parts thereof during disassembly, a rotary cylinder (5) has a collar (19) on which the rotary cylinder is supported at the cam disk (2), wherein the cam disk (2) is connected to the housing (13) in such a way as to be torsion-proof and stationary.

Abstract: An engine includes a radial arrangement of cylinders each having a reciprocating piston with a piston head and a connecting rod pivotally linked to the piston head at an upper end. A lower end of each connecting rod is pivotally linked to a crank disk that is rotatably mounted on a crank arm of a crankshaft. Steam intake valves at each cylinder are momentarily opened by a bearing cam roller that is moved in a circular path by rotation of the crank disk to sequentially engage spring urged cam followers on inboard ends of radially extending valve stems. Low pressure steam or gas is injected into the top of each cylinder, as the intake valves of the cylinders are opened in sequence, thereby forcing the piston in each cylinder through a power stroke to move the crank disk and turn the crankshaft. Angular displacement of each connecting rod through the return stroke of the piston urges an exhaust reed valve on the piston head to an open position, thereby releasing exhaust steam to a condenser chamber.

Abstract: A hydraulic machine arrangement includes at least one hydraulic machine having a plurality of pistons reciprocating within corresponding cylinders. The pistons can be driven by a cam to operate the hydraulic machine as a pump, and they can drive the cam to operate the hydraulic machine as a motor. The hydraulic machine can be configured to selectively disengage a certain piston or pistons from the cam to operate at less than full displacement. Controlling the pressure in the cylinders corresponding to the disengaged pistons can be accomplished by a number of mechanisms, including selectively exhausting fluid from the cylinders, or using a jet pump to siphon off some of the fluid from a high pressure side of the hydraulic machine. Two of the hydraulic machines can be mounted together to help balance axial forces and eliminate the need for an expensive high capacity thrust bearing.

Abstract: The invention relates to a drive device for a piston pump of a braking system of a vehicle having at least one piston element displaced in the longitudinal direction in a housing between an upper dead center and a lower dead center by means of an eccentric device. The eccentric device comprises at least one cam-shaped eccentric element having a covering surface forming a control curve which is used to control the displacement of the piston element. A roller bearing device is arranged between the control curve of the eccentric element and the piston element, which has such an elasticity that the piston element can be controlled according the predefined contour of the control curve of the eccentric element.

Abstract: A radial cylinder hydraulic motor comprises: oscillating hydraulic cylinders (1) driven to oscillate by means of an eccentric crankpin (2) formed on the motor shaft (3), the oscillating cylinder liners (4) being provided with trunnions (5) for oscillation about a parallel axis (C) to the axis (A) of rotation of the motor shaft which are coupled oscillably to the motor crankcase (6); reciprocating pistons (7) within said liners which are provided with a runner (8) for sliding over the outer surface (9) of said eccentric crankpin; and a rotary disk distributor (10, 23) coupled to the motor shaft for synchronized rotation therewith, adapted to place the conduits (12, 13) of the hydraulic circuit in fluid communication with the conduits (14) of the respective cylinders during the delivery and discharge strokes via ports of slanted or through-going configuration; and advantageously includes the rotating disk of the distributor formed with a connection/supply means (38, 40) to the passageway between one face (27) a

Abstract: A hydraulic mechanism including a cylinder block having radial pistons and mounted to rotate in a stationary casing, and a distribution cover that forms a portion of the casing that has feed and discharge ducts that extend between an outside face and inside of face of the cover. The internal distributor has distribution ducts that are selectively connected to the feed and discharge ducts that open out into a distribution face that is perpendicular to the axis of rotation and that is disposed against the communication face (10A) of the cylinder block so as to cause the distribution ducts to communicate with the cylinder ducts. In a zone defined radially outwards by end-wall portions of the cylinders, a transverse face of the cylinder block is provided with an axial setback in which at least a portion of the distributor is disposed.

Abstract: A rotary displacement machine with radial pistons, comprising a supporting structure, with a main body and a cover, a centrally mounted distributor, a rotating unit consisting of a rotor provided with a number of radially extending cylindrical chambers, each chamber containing a respective piston mounted for sliding movement in a first direction along a first axis coaxial with the longitudinal centerline of the respective cylindrical chamber; wherein the rotor is mounted by support bearings means in the main body and cover and the distributor is mounted to float within a space defined by the cover and with coaxial relationship in the rotor by bearing means.

Abstract: The present invention provides a method of controlling a fluid working machine (12) having a plurality of working cylinders (14) having pistons (16) therein and arranged to drive a shaft (18), in which said cylinders are supplied with pressurised working fluid via a manifold (24), the contents of which may be 5 purged by a de-pressuriser taking one of a number for forms such as to allow re-activation of said machine (10).

Abstract: A hydraulic machine has a plurality of pistons reciprocating within corresponding cylinders. Embodiments may operate as a pump, a motor, or both. The hydraulic machine can be configured to selectively disengage certain pistons from the cam to operate at less than full displacement. This provides a discrete variable displacement machine. The hydraulic machine can also be configured to provide a type of continuously variable displacement by changing the high and low pressure port connections to the cylinders at different positions of the pistons' stroke—i.e., positions other than TDC and BDC. To inhibit hydraulic lock when continuously variable displacement is used, the closing and opening of the high and low pressure ports are allowed to overlap; however, a barrier is used to inhibit short circuiting the fluid between the ports. Individual cylinders can be provided with relief valves to further inhibit hydraulic lock.

Abstract: The invention relates to a radial piston pump having external loading. Said radial piston pump has an inner eccentric which is attached to a rotatable driveshaft, a cylinder block which has positionally fixed cylinder bores aligned radially with respect to the driveshaft, and displacement pistons which are mounted in a longitudinally movable manner in the cylinder bores, with the displacement pistons having a piston head with a short casing height, and being mounted with their piston base on the eccentric, in such a way that the piston head, during its longitudinal movement, pivots in a predetermined angle range &r about the longitudinal central axis of the associated cylinder bore.

Abstract: An outlet device and motor assembly for a pressured vessel is disclosed, where the assembly includes: a generally vertical drive shaft extending below and through the vessel and coupled to a rotating mechanism within the vessel; a stationary outlet housing supporting the drive shaft; a thrust bearing mounted on the outlet housing and around the drive shaft to rotationally engage the drive shaft; a hydraulic drive coupled to rotationally drive the drive shaft, and a radial bearing mounted around the drive shaft to rotationally engage the drive shaft and said radial bearing is at or below the hydraulic drive.

Abstract: The engine comprises a housing, a rotor, which is mounted in the housing for rotation about its axis. The rotor has a pair radially opposite cylinders spaced radially and apart from its axis of rotation. A piston spaced in each of the cylinders. Gas intake and gas exhaust may take place through the ducts in the body of the rotor. There is a rotary ring mounted in the housing which rotates about its axis of rotation being parallel and spaced apart from the rotor axis. The rotary ring has been connected to the pistons for rotation therewith and being impelled to rotate in the same direction and with the same velocity relative to the rotor by pins of the rotor. The pressure in the cylinders acts on the rotor being eccentrical relative to the axis of rotation of the rotary ring and so affords power.

Abstract: A motor includes a plurality of linearly activated pistons, positioned radially around an axis, which are selectively and sequentially biased against on offset element to produce rotation of a rotatable element about the axis. The motor further includes an power source, which may be electrical, pneumatic or hydraulic and a structure for supporting the pistons, the offset element and the rotational element, and providing direction of a desired motion.

Abstract: A hydraulic regenerative braking system and method for a vehicle include a variable displacement hydraulic machine operable as a pump or a motor (22). The hydraulic machine facilitates connections between some of its piston cylinders (50, 52) and a low pressure source (32), and some other of its piston cylinders (50, 52) and a high pressure source (28). The cylinders are alternately connected to the high and low pressure sources such that a pressure transition occurs during each piston stroke. By controlling where in a piston stroke the transitions occur, the power of the hydraulic machine can be modulated. The hydraulic machine is configured to effect the pressure transitions in only a portion of the cylinders at one time. This can be accomplished by asymmetrically configuring cam lobes (86, 88, 90) and fluid ports (74, 76, 78, 80, 82, 84). Staggering the pressure transitions helps to inhibit flow disturbances in the machine when it is operating at less than full displacement.

Abstract: A hydraulic motor having pistons, some of which are in a working phase and some are in a non-working phase, whereby the pistons are adapted to rotate the piston hydraulic motor's shaft or casing. To the piston hydraulic motor there are at least two working pressure medium channels, whereby the piston hydraulic motor can be connected for full volume or partial volume. In full volume, all the pistons in the working phase can be brought into the working phase in the motor by a pump's working pressure, whereas in the case of partial volume flow only some pistons can be brought into the working phase by the working pressure. The piston hydraulic motor comprises an actuator, which can close one of the piston hydraulic motor's pressurized inlet channels when the pressure in the other pressure medium channel falls below a certain critical value.

Abstract: A pneumatic rotary motor includes cylinders around a central channel, an inlet tube, an exhaust tube, ducts being in communication with the cylinders, a rotor in the channel and including an eccentric rotation member, a rotating shaft, an intake valve adapted to communicate the inlet tube with the duct or not, and an exhaust valve adapted to communicate the exhaust tube with the duct or not, and pistons slidably mounted in the cylinders and being in contact with the rotation member. Sequentially entering compressed air into each cylinder through the inlet tube, the intake valve, and the duct will push the piston to rotate the rotation member to output power from the rotating shaft, and release the air from one of the cylinders through the duct, the exhaust valve, and the exhaust tube at the end of each revolution of the rotor.

Abstract: A plunger pump, includes: a plunger pump unit including a pump chamber and a plunger for pressing a hydraulic fluid in the pump chamber to perform a discharging operation of the hydraulic fluid; a motor; and a cam portion driven by the motor to rotate and press the plunger. The cam portion has at least two discharge regions for pressing the plunger and a suction region formed between the discharge region. The plunger performs the discharging operation two times or more by one rotation of the cam portion.

Abstract: The radial piston or reciprocating engine (1) has annularly juxtaposed, radially directed piston-cylinder units (2, 3). The outward stroke of the pistons (2) is controlled by the cam (11) of a common eccentric shaft (12), whereas the inward stroke thereof is controlled by a control ring (16), which engages in a lateral recess (17) of each piston (2) running in the direction of a secant and adapted to a cross-sectional shape of the control ring (16). The recess (17) is then bounded by a base wall of the piston (2) with which the control ring (16) is in controlling sliding contact via an inner control face (20). The pistons (2) are hollow and carry on their face the diaphragm of a diaphragm valve. Thus, the reciprocating engine (1) has a particularly compact construction and can be highly loaded, so that it is particularly suitable as a compressor of a CO2 vehicle air conditioning system.