Abstract: The invention relates to a hydraulic motor, in which a rotating motion is generated by a combined effect of a cam ring (2) and roller means (5) connected to the pistons (5) of a cylinder group (3).The object is to provide a new dummy coupling solution for a motor of this kind. To the cylinder group (3), preferably between two cylinders (4), is fastened a generally T-shaped support (8, 9) and round each branch (9) of the T is mounted a spiral spring (11) influencing respective piston (5). One end (12) of each spring influences the piston (5) through a passage (17) formed in the cylinder wall and the other end (13) of the spring leans against the support (8).

Abstract: A radial piston machine includes a stationary cam plate and a rotational cylinder block provided with radial bores receiving a plurality of radial pistons displaceable in those bores and supported against the cam plate surrounding the cylindrical block by rollers. Each piston has in the region of supporting the roller a web which is cured and supported in one of the grooves formed in the cam plate.

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: 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. The invention also provides means to enlarge the stroke of the pistons in a given size and weight of the device.

Abstract: A hydraulic radial piston pump or motor comprises a rotary cylinder unit (20) mounted to rotate on a fixed pintle (25), the unit (20) having radial cylinder bores formed by cylinder sleeves (23) each housing a piston (40) connected by a ball joint (44) to a slipper (45) engaging a surrounding annular track ring (47). The unit (20) also includes a separately formed central sleeve (21) having ports (26) cooperating with ports (31,32) in the pintle, the pintle ports (31,32) and the sleeve ports (26) being elongated in a circumferential direction. The pintle has three parallel flow passages, two (28') of smaller diameter than the third (27'). The slippers (45) are held resiliently against the track ring (47) by a band (66) having windows (68) which fit the slippers, the band being of resilient material and split at one point. The cylinder unit (20) has a rounded external surface and is free to float in an axial direction which provides a self-centering effect.

Abstract: In a vehicle or device a fluid motor is employed to drive rotary members, such as wheels, propellers, tracks. The motor is provided with an arrangement which includes a control means and an axially moveable member. By utilizing the control means, for example, by a flow of fluid, the axially moveable member is used to apply an action, which is not common to the usual operation of fluid motors. The arrangement may be used to arrest the rotor of the motor from rotation when no pressure is in the driving fluid line. It may also be used to control the pitch of propellers with variable pitch arrangements. Also possible is to use the arrangement to automatically obtain an auto-rotation of rotor blades on vertical axes of vertically take off and landing vehicles, when the pressure in the fluid line to the motors for driving the motors drops below a predetermined minimum of pressure.

Abstract: A rotary internal combustion engine having a plurality of radially aligned cylinders collectively supported for common rotation about a shaft member having one portion with a first axis, with a piston block including a piston for each of the cylinders slidable within each cylinder and supported for rotation about the shaft member having another portion with a second axis which is displaced from and parallel to the first axis, the cylinders being linked with the piston block to rotate the cylinders about the first axis with the pistons and the piston block while moving the cylinders transversely of the first axis for rotation of the cylinders and pistons together thereby producing relative reciprocal motion of each piston with respect to its cylinder.

Abstract: A rotary internal combustion engine having a plurality of radially aligned cylinders collectively supported for common rotation about a first axis, with a piston block including a piston for each of the cylinders slidable within each cylinder and supported for rotation about a second axis which is displaced from and parallel to the first axis, the cylinders being linked with the piston block and move transversely of the first axis thereby producing relative reciprocal motion of each piston with respect to its cylinder.

Abstract: A gas refrigerant compressor comprises a shaft having a first portion and an offset portion. A body supports the first portion of the shaft for rotating movement around an axis of rotation and defines a compression chamber. A compression member is adapted for reciprocating movement within the compression chamber. The compression member is connected to the offset portion of the shaft such that rotating the shaft draws gas refrigerant into the compression chamber upon movement of the compression member toward the axis of rotation and exhausts compressed gas refrigerant out of the compression chamber upon movement of the compression member away from the axis of rotation.

Abstract: A piston for a hydraulic piston machine in which a piston body receives a ball in a space defined at one end of thereof. A bearing dish supports the ball in the space with an O-ring engaging the recess to seal the bottom surface of the bearing dish. Preferably the bearing dish is formed with a steel support layer, a bronze layer cast onto the steel support layer, and a plastic layer supporting the ball.

Abstract: A rotary hydraulic engine is disclosed having a stationary crankshaft with an eccentric crank portion disposed thereon. A housing is rotatable about the crankshaft. At least two pairs of cylinders are connected to the housing and extend quadrilaterally therefrom. A piston is slidingly disposed within each cylinder, and is connected to an oppositely disposed piston so as to move in tandem when propelled by a fluid under pressure. An external valve mechanism is provided which is connected to the cylinders so as to sequentially actuate the pistons contained therein when supplied with fluid under pressure. A scotch yoke assembly integrates the motion of the pairs of pistons into a balanced array of weight and force vectors rotating around the axis of the eccentric crank portion of the stationary crankshaft. This sequential reciprocation of the pairs of pistons imparts a rotary motion to the housing, the rotary motion in turn causing the housing to act as a flywheel.

Abstract: A fluid motor operated by a gas or liquid and having two relatively rotatable parts comprises a plurality of pistons which cooperate with a cam member to produce the rotational output from the motor. The cam member has at least three similar lobes and forms one of the parts and the other part includes at least four cylinders each containing a piston. Each piston/cylinder combination also acts as a slide valve so as to control both the supply of fluid to one of the other pistons and the exhausting of fluid from another of the other pistons.

Abstract: A hydrostatic transaxle assembly having first and second output shafts extending outward therefrom. The assembly includes a housing enclosing a portion of the first and second output shafts and forming a generally cylindrical chamber therein. A manifold is positioned around one of the output shafts and has an outer surface which mates with an inner surface of the housing. A pair of high torque, low speed motors are secured to an inner surface of the housing on opposite sides of the manifold. One of the motors is splined to the first shaft while the other motor is splined to the second shaft. Operation of the motors cause the respective shafts to rotate. The motors operate on pressurized fluid which is supplied through fluid passages. A control valve is positioned across the fluid passages to regulate the operation thereof.

Abstract: In a radial piston pump, motor, transmission the deep diving or entering piston shoe is utilized and swingably borne in the pivot-bed of the radially reciprocating piston. Since deep diving piston shoes have large piston strokes, the shoes pivot in the pistons in large angles. Thereby a considerable force-portion of the load on the piston is transfered to the wall between the piston and the cylinder, whereby heretofore short pistons occasionally produced welding and sticking between the cylinder wall and the piston wall. The piston therefore receives radially extending portions, which may extend beyond the medial portion of the piston shoe and may even enter into the ring groove of the piston stroke actuator ring. Thereby a very long guidance of the piston on cylinder wall portions is obtained, which makes the application of effective pressure balancing pockets at correct location between piston wall and cylinder wall possible.

Abstract: A cam-type hydraulic driving device for producing hydraulic pressure and distributing the same to a plurality of hydraulic actuator cylinders of a transfer feeder or the like apparatus. The cam-type hydraulic driving mechanism includes a plurality of rotary cams arranged in a common plane and on a common circle around a driving means by which the cams are driven rotatingly, and plungers adapted to be driven by the cams thereby to produce the hydraulic pressure. The cams are easily accessible simply by removing a cover of a frame of the apparatus, so that the inspection and maintenance are facilitated considerably.

Abstract: A hydraulic piston and cylinder machine includes a plurality of pistons and cylinders, a ring of ports for alternatively supplying fluid into, and for allowing the fluid to be discharged from each cylinder, and a cam having a plurality of lobes to control the displacement of the pistons in a cylinder block with respect to the progression of the cylinder block along the direction of the cam or vice versa. Each of the pistons traverses each of the cam lobes during a full rotation of the machine to undergo a number of piston strokes equal to the number of lobes. A control valve is adjustable to route working fluid discharged through at least one of the fluid discharge ports of the machine to the exhaust fluid outlet of the machine during each full rotation of the machine via an isolated pressure zone of the machine.

Abstract: A rotary 2-cycle diesel engine has five circumferentially spaced cylindrical combustion chambers orbiting in one direction for engagement with four spherical pistons mounted for parallel orbit in the opposite direction. The pistons and combustion chambers interact through a 72.degree. arc of the combustion chamber while aspiration, exhaust and cooling are effected by centrifugal movement of the air during the remaining 288.degree. arc. The connecting rods of the pistons are provided with a double bend and are geared for rotation to provide a longer piston stroke. A cam wheel and follower arrangement control the necessary piston orbiting speed fluctuation in relation to the combustion chambers' angular velocity.

Abstract: There is provided the combination of a stationary frame, a stationary sun gear on the frame, and a rotary frame pivoted about the axis of the sun gear. The rotary frame carries three crankshafts at substantially 120.degree. intervals, and for each crankshaft there is provided a cylinder in the rotary frame, and a piston mounted for reciprocation in each cylinder. Each crankshaft is fixed to rotate with a respective planetary gear and all planetary gears mesh with the sun gear and have the same pitch diameter as the sun gear. Thus, any point on the pitch circle of a planetary gear describes a cardioid as the planetary gear rotates around the sun gear once. The crankshaft eccentricity is about one-third of the pitch radius of a planetary gear, and each piston has a connecting link to its respective crankshaft. Fuel metering means, such as a carburetor, are provided for delivering a combustible mixture to the cylinders.

Abstract: A radial piston machine has a cylindrical housing which encloses a rotary shaft formed with an eccentric. A plurality of stationary piston rods is connected to the inner wall of the housing and radially directed toward the shaft. The free ends of piston rods are provided with ball-and-socket joints permitting universal rotary movement of the pistons. Each piston slidably engages the inner wall of an assigned cylinder which at its bottom wall slidably engages the eccentric. In a modification, the spherical surface of the stationary ball joint directly engages the inner wall of the cylinder.

Abstract: A hydraulic radial piston motor with a cam disc and a cylinder block with a number of pistons running in cylinders in the block presses rollers against the cam disc in such a way that a torsional moment arises. The rollers are formed with guide members running in slots in guide units which take up tangential forces. The rollers are mounted in roller cages which are formed with hydrostatic bearings. At their outer end each piston is formed with a part-spherical bearing surface and the roller cage has a cooperating part-spherical bearing surface, which allows angular movements between the roller cages and the pistons in all directions.

Abstract: A compressed fluid reciprocating piston engine provides for cylinders radially disposed about a crankshaft and coupled thereto by means of piston rods engaging a disc rotatable with the crankshaft. Exhaust fluid feedback is merged into higher pressure fuel at a venturi throat section in the fuel conveyance line where the pressures are temporarily substantially equalized. A timer distributor mechanism consists of a disc rotatable by a shaft as journalled between two outer panels thereby with a rotating aperture hole to provide pressurized fluid through a scanned sequence of outlet lines serving to operate fluid input valves coupling a fluid pressure source selectively to power the reciprocating pistons.

Abstract: A hydraulic rotary actuator which comprises a harmonic drive and a hydraulic motor completely enclosed in the casing of the harmonic drive so that the rotation of the motor is taken out through an output shaft fixed to the drive at a reduced speed. In the casing of the harmonic drive there are provided an electromagnetic brake which acts on the motor, means for increasing the performance of the magnetic brake, means for magnetically shielding the supporting shaft of the hydraulic motor, and means for detecting the angular position of the motor and that of the output shaft relative to the supporting shaft of the motor.

Abstract: An energy converter transmission uses a throughshaft clutch and a through-shaft energy converter for transfer of energy to and from a shaft. The energy converter includes a housing and a rotor mounted to a hollow coupling shaft. The energy converter can be an hydraulic, a pneumatic or an electric energy converter. A first clutch element is also mounted to the coupling shaft. A second clutch element is mounted to the main drive shaft which passes through the hollow coupling shaft. Actuation of the clutch engages the clutch elements to couple the main drive shaft to the rotor via the clutch and coupling shaft.

Abstract: Three radially extending push rods (26, 28, 30) make contact with an undulating cam surface on the periphery of a cam (10). The push rods (26, 28, 30) are driven inwardly by electrical solenoids (94, 96, 98) or fluid motors (106, 108, 110). At the end of each step, one of the push rods (26, 28, 30) is fully extended and in contact with the bottom of a valley region of the cam surface. The second push rod is in a partially extended position against a sloping surface between a peak and a valley. The third push rod is in a partially extended position against an oppositely sloping surface between a peak and a valley. The push rods (26, 28, 30) are located within the center plane of a relatively thin cam. In other installations, they are spaced axially apart or both circumferentially and axially apart. A cam surface twists (FIG. 7) as it extends axially to, in that manner, provide different cam positions under each of three axially spaced apart push rods. A plurality of cams are connected together.

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: The invention relates to a pressurized fluid mechanism comprising a cam, a cylinder-block mounted for rotation with respect to the cam, cylinders disposed radially in said cylinder-block, pistons sliding in said cylinders, supporting rollers supporting the pistons on said cam, each roller being placed inside a transverse bore provided in each piston and a device with abutments to hold each roller in axial position in its bore.Each roller being able to comprise two projecting members on each side, the abutments present interruptions in axial directions which coincide with the radial planes containing said projecting members.The invention finds an application in the production of compact engines with "releasable" pistons.

Abstract: The hydrostatic actuator in a constant displacement type radial piston pump or engine includes two telescopically arranged component parts separating a high pressure side from a low pressure side for a working medium, and defining a variable pressure space therebetween. The pressure space communicates with the high pressure side via a flow restrictor and with the low pressure side via a pressure limiting valve. The telescopically arranged components parts act as piston-like members and adjust the gaps between the outer end faces of the component parts and their control surfaces of the actuator in response to the pressure in the pressure space.

Abstract: A radial or axial piston type hydraulic motor has a plurality of cylinders connected by pressure conduits to a pressure fluid distributor. A check valve spring-biased in closing direction is built in at least one pressure conduit and has a first surface portion acted upon by pressure from the cylinder, a second surface portion which is exposable to pressure fluid from the distributor to act on the check valve either in opening direction or in closing direction and a third surface portion exposed to a control pressure in opening direction. The second surface portion being at least as large as the first surface portion and larger than the third surface portion, and the combined area of the first and second surface portions exceeding the surface area of the second surface portion.

Abstract: Improved energy translation devices, such as fluid motors or pumps of the type including an orbiter member operatively coupled between a stator and a rotor, are disclosed which include an individually pressure compensated valving arrangement, telescopically interfitted piston elements having spherical, pressure loaded sealing ends, and a unique counterbalancing mechanism. The valving arrangement has a pair of intercommunicated, freely laterally movable valve bodies adjacent each fluid displacement piston assembly and respectively on opposite sides of the orbiter; each body includes especially designed, opposed fluid chambers therein for receiving pressurized fluid and individually urging each pair of bodies toward the central orbiter to establish a sliding seal with the orbiter and a desired amount of lubricating leakage of fluid adjacent the valve bodies.

Abstract: The invention relates to a fluid engine constituted by cylinders divided into two groups, by a valve bank which comprises two enclosures connected selectively to a source of fluid and to a reservoir, and connecting each cylinder of a first group, with the said enclosures, successively, and by means for selecting the speed of the engine, which means comprise a movable member adapted to occupy two positions which, in a first position, creates a communication between the cylinder of the second group and the enclosures, successively, and in a second position, isolate said cylinders from one of the enclosures.Said engine comprises a shuttle valve which, when the movable member is in its second position, connects the cylinders of the second group to that of the two enclosures which contains the fluid under the lowest pressure.The invention finds an application in the production of a mechanically reliable reversible engine.

Abstract: A piston-rack rotary actuator having four pistons each with an integral rack and each displaceable along a cylinder unique thereto, the racks meshing with a center gear at equiangularly spaced points and causing angular movements of a shaft about its rotational axis when said pistons are displaced along their respective cylinders, said gear being secured to said shaft. The racks are formed in respective webs which are supported by the actuator body in such a manner as to prevent piston-slewing which would otherwise occur due to the separating force generated by the meshing gear and racks when said racks are moved relatively to the gear.

Abstract: A fluid pressure machine such as a motor or pump has an orbiting cylinder block (9) housing a number of radial pistons (11) sliding within respective cylinders (10). Each piston has a cylindrical coaxial bore in which a fluid displacing member (13) fixed to the cylinder block is located so as to define within the cylinder an annular outer chamber (14) and an inner chamber (15). A selectively operable spool valve (36) is arranged for supplying hydraulic fluid under pressure to the inner and/or the outer chamber and thereby control the operating speed of the machine.

Abstract: A reversible fluid unit which may be used as a motor, pump, brake or clutch. The unit has a plurality of sequentially inflatable diaphragms, to impart a rotative force to a plurality of roller members. When used as a motor, brake or clutch, air under pressure is sequentially fed to the plurality of diaphragms which inflate against roller members connected to a driven output shaft. As the diaphragms inflate, the roller members are contacted by the inflated diaphragms to impart or brake rotary motion thereto. When used as a pump, the rollers are rotated to pump air out through the diaphragm members.

Abstract: The invention relates to a fluid mechanism supplied with pressurized fluid by means of a "dis-engageable" valve-seat. Such mechanism further comprises a controlled and independent device for re-engaging the said valve-seat. The invention finds an application in the production of a hydraulic relief engine for use on a trailer pulled by a tractor.

Abstract: A rotary engine, especially a rotary diesel engine, utilizing a pair of substantially identical cooperating rotor assemblies associated with a pair of spaced, parallel stationary intake-exhaust gas ports. Each rotor assembly includes a hub portion immediately surrounding a stationary shaft, a plurality of arms extending radially outwardly from the hub portion, a radially extending cylinder formed in each of the arms, a radially extending passageway leading from the stationary shaft to each cylinder, and a radially reciprocal piston disposed in each cylinder. The stationary shafts are so spaced and the rotor assembly so mounted that upon rotation of the rotor assemblies each piston associated with each rotor assembly will engage the hub of the other assembly upon completion of the compression stroke of the piston, and then will engage an arm of the other assembly to impart a rotational force to the arm upon radial movement of the piston during a power stroke, the rotor assemblies rotating in opposite.

Abstract: The invention relates to the slide shoe arrangement of a radial piston type of machine. This type of machine has a housing with a rotatable shaft and a piston carrier mounted on the shaft. Pistons in the carrier have reciprocal and radial movement relative to the carrier and shoes attached to the pistons have sliding engagement with an annularly shaped, eccentrically adjustable, track which surrounds the carrier. The track has a spherical surface portion with a predetermined radius R1. The shoes have spherically shaped surface portions of radius R2 which engage the track, radii R2 being larger than radius R 2 to form tapered gap chambers between the spherical shoe surfaces and the spherical track surface. The shoe portions may have annularly shaped flanges contacting the track surface through the spherical shoe surfaces. The flanges are resiliently connected to the shoe portions.

Abstract: There is disclosed a hydrostatic motor provided with radially arranged hydraulic cylinders provided with radial pistons composed of pairs of pistons with different diameters fitted one into the other. The motor is selectively operable in either of two operating conditions, in a first of which the large and small pistons move as a unit in a heavy duty operation, and in a second of which only the small pistons move in a low duty operation. The motor includes a rotor and a stator, duct means arranged in the stator for the supply of pressure fluid to the pistons, a change-over unit within the motor, and a fluid distributor unit housed in the stator. The motor of the invention employs virtually the same distributing circuits during its operation in both its heavy duty and its low duty modes of operation.

Abstract: The invention relates to an engine with radial pistons 9, which are coupled to elastic return means 25 for free-wheeling operation.Said elastic means are constituted by springs 25 whose number is equal to that of the pistons and by levers 21 mounted to pivot, each with respect to a piston 9, about an axis parallel to the axis of rotation 6 of the cylinder block 7, and equal in number to the springs, whereas each spring 25 is coupled to two levers 21, each lever constituting the bond for two springs 25.An application is the production of a hydraulic engine which is reliable and of simple design.

Abstract: The device is comprised of an auxiliary annular element concentrically mounted on each piston end facing the spherical surface of the rotor. Each piston end is provided with an annular shoulder bearing against a matching annular shoulder formed on the inner periphery of the circular aperture through which the auxiliary annular element is mounted on the piston end. The same auxiliary annular element is also provided with oppositely disposed lateral flanges, in a position corresponding to the sides of the rotor, each having a respective recess which is open in the axial direction opposite to the corresponding side of the rotor and extending in the circumferential direction in an arc of a circle concentric with the rotor. Coupling rings disposed at the sides of the rotor, concentrically therewith, engage said recesses to hold the piston end in contact with the spherical surface of the rotor.

Abstract: A radial-piston machine has a rotor formed with a plurality of each a piston carrying radial cylinders. Each such piston is formed on its radially outer end with a part-spherical seat and a part-spherical portion of a respective piston shoe that rides on an eccentric cam in the housing is engageable in each seat. Each such piston shoe can move radially into and out of engagement with the respective piston. A pair of end members axially flank the piston shoes with play so that these shoes may also move axially relative to the motor. The piston-engaging portions of the shoes are always engaged radially in said cylinders. The cylinders may have outer portions with a cross-slot extending parallel to the axis of the rotor through said cylinders.

Abstract: Rotary power engines driven by explosive or expansive media have pistons which reciprocate in cylinder cavities of a rotor at opposite sides of the rotor axis and which contact the walls of a stator by means of rollers. The rotor is turned by the reactive force of the pistons on the stator and by the reactive force of the working medium which exhausts from the cylinders as jets. In an internal combustion embodiment, one set of cylinders is used for compression of the working medium, and the compressed medium is transferred cyclically to adjoining cylinders for driving the rotor.

Abstract: Apparatus for fixing and driving a displacement member (such as a wheel) of a vehicle is disclosed. In particular, an axle journal is coupled to the vehicle chassis. At least one rotating bearing surface is disposed between the displacement member and the axle journal for the rotatable assembly of the displacement member. A drive motor is provided having a stator which is removably attached to the axle journal and a rotor which is removably mounted to rotate with respect to the stator by means of rotating bearings in contact with the bearing surface. Since the rotating bearings of the motor only contact the removable bearing surface, the motor can be dismantled while maintaining the displacement member in place on the axle journal.

Abstract: Air motor having a crankcase about which a plurality of expansible chambers are arranged so that a crankshaft journaled within the crankcase can be connected to a bellows of the expansible chamber by a rod assembly. The crankshaft moves a cam means which in turn moves a valve assembly for controlling flow of compressed air into and out of the expansible chambers. Each expansible chamber is formed by a bellows concentrically aligned and placed within a cylinder to form an annular chamber therebetween. The rod assembly is received through a guide and seal means which maintains the rod axially aligned with respect to the expansible chamber, and seals the interior of the crankcase from the expansible chamber assembly. An intermediate chamber is formed between the crankcase and expansible chamber which greatly increases the efficiency of the motor.

Abstract: An economical gas powered starting system is provided for relatively small, consumer operated implements powered by two or four cycle internal combustion engines. A low cost, radial piston starter motor is coupled to a liquified gas energy cell by a metering arrangement which charges a predetermined amount of gas to the motor, just sufficient to start the engine in its operating environment. The system and motor design disclosed develops torque-speed-time characteristics insuring excellent starter reliability.

Abstract: A hydraulic mechanism, e.g. a pump or motor, comprises a plurality of cylinders and pistons and a piston-displacement selector which is provided with blind helical grooves for controlling connection of the cylinders to the main fluid supply.

Abstract: The hydraulic motor has a shaft rotatably mounted in a housing and mounting an eccentric to which is journaled an annular ring. A plurality of radial pistons are adapted for sliding movement within spherical members having cylindrical bores for receiving the radial pistons. Each of the spherical members is adapted for oscillating movement between an annular abutment and a spring-mounted annular ring-type valve seat.The ring acts as a distributor sleeve or and as a conduit for fluid passing to and from the cylinders and a planar distributor.The hydraulic motor can be used either as a pump or a motor at low or high speeds and under high pressures and is reversible.

Abstract: A housing is provided defining a central cavity and a rotor is journaled within the cavity and includes at least one piston bore formed therein extending generally radially of the axis of rotation of the rotor. The bore opens outwardly of the periphery of the rotor and a piston is reciprocal in the bore. The cavity defines at least one pair of approach and departure ramp surfaces extending thereabout in registry with which the outer end of the bore swings upon rotation of the rotor and the piston includes anti-friction thrust means on the end thereof remote from the axis of rotation of the rotor engageable with the ramp surfaces. Inlet and outlet means are provided and operative to admit fluid under pressure into the inner end of the bore and to exhaust fluid from the inner end of the bore in timed relation with rotation of the rotor as the thrust means swings into position engaged with the beginning of the departure and approach ramp surfaces, respectively.

Abstract: A hydraulic motor defined by a relatively compact structural design and capable of delivering high torque at low speeds. A drive shaft is mounted within a casing and disposed in surrounded relation to a cylinder housing which includes a predetermined number of equally spaced cylinders extending radially outwardly from the longitudinal axis of the shaft but being attached thereto. A piston is mounted for free floating movement within each of the cylinders and includes a cam rider attached thereto for disposable driving engagement with a cam surface. The cam surface is formed from a plurality of angularly oriented surface portions on a plurality of cam rings which are removably attached to the casing for replacement or substitution. An annular valve ring is disposed in surrounding relation to the shaft and in surrounded disposition relative to both the cylinder housing and a portion of the casing.

Abstract: A radial piston type hydraulic pump-motor comprises a cylinder block formed with a plurality of radial cylinders circumferentially equally spaced and each opened at its radially outer end; a plurality of piston assemblies each radially slidably accommodated in each of the radial cylinders of the cylinder block to provide a cylinder chamber defined by the radial cylinder and the piston assembly; a plurality of inlet-outlet passages formed in the cylinder block, each having one end opened at said cylinder chamber and the other end opened exteriorly of the cylinder block; a housing accommodating therein the cylinder block and the piston assemblies and having a radially inner face held in contact with the radially outer ends of the piston assemblies, the improvement is characterized in that the radially outer end of the piston assemblies is in contact with the radially inner face of the housing at its axially spaced two points.

Abstract: The invention relates to a fluid engine constituted by cylinders divided into two groups, by a valve bank which comprises two enclosures connected selectively to a source of fluid and to a reservoir, and connecting each cylinder of a first group, with the said enclosures, successively, and by means for selecting the speed of the engine, which means comprise a movable member adapted to occupy two positions which, in a first position, creates a communication between the cylinder of the second group and the enclosures, successively, and in a second position, isolate said cylinders from one of the enclosures.Said engine comprises a shuttle valve which, when the movable member is in its second position, connects the cylinders of the second group to that of the two enclosures which contains the fluid under the lowest pressure.The invention finds an application in the production of a mechanically reliable reversible engine.