Abstract: A hydraulic piston engine driven by a lubricant-free, water-based pressure fluid, and comprising an enclosing housing and a piston-connected drive shaft supported by radial journal bearings in bearing bushings. One of the sliding surfaces of the radial journal bearing comprises a recess with a bearing-supporting hydrostatic pressure fluid pocket. The center of the recess is displaced by an angle (.alpha.) in the direction against the direction of rotation of the drive shaft, seen in relation to the geometrical, radial mean point in the high-load area for transmission of the piston forces to the bearing surface via the drive shaft. Hereby a particularly reliable piston motor of the type indicated is provided.

Abstract: A pressurized fluid motor comprising a case, constituting its stator, and including connection ducts, a cylinder block rotatable about a first axis relative to a reaction member that is stationary relative to the case, and an internal fluid distributor that is likewise stationary relative to the case and that has distribution ducts. The case has a connection and fixing face that is plane and perpendicular to the first axis and into which the connection ducts open out. There exists a second axis perpendicular to and intersecting the first axis and lying in the plane of the face, relative to which the centers of the ends of the connection ducts are disposed in such a manner that the distance between each of them and said second axis lies in the range one-fourth to once the distance between said first axis and the point of the face that is furthest from said first axis, with the ends of the connection ducts all being situated on the same side of said second axis.

Abstract: A radial piston hydrostatic machine having an outer housing structure comprising at least two housing elements connectable together along a parting-plane arranged perpendicular to the rotational axis of said drive-shaft to define an internal chamber, a drive-shaft supported in the housing to drive the cylinder-barrel, the cylinder-barrel having a number of radial cylinders, each cylinder containing a piston such that the pistons can bear on the track-ring, fixed abutment means in the housing and disposed radially adjacent the track-ring for resisting the action of the pistons on the track-ring and suppressing vibration emanating from the track-ring.

Abstract: The invention relates to a hydraulic mechanism comprising: a cam; a cylinder block; cylinders formed in the cylinder block; pistons slidably mounted in the cylinders; thrust rollers for the pistons acting on the cam and axially defined by two transverse faces; two wedging parts for each roller, each wedging part being disposed in a recess between the end face of the roller and the inside face of the cylinder, thereby holding the roller in position, one of the wedging parts extending to the bottom portion of the recess and including a groove parallel to the axis of the piston, and a projection that is fixed relative to the cylinder being received in the groove.

Abstract: A radial piston pump for low-viscosity fuel according to a first aspect of the invention comprises a pump housing, which is constituted of as few as two structural bodies (from among a drive-side housing member 2A, a fixed cylinder 81 and a cover 4), and a leaf valve member 82 which is formed with intake valves 87 for opening and closing intake side passages 27 and discharge valves 88 for opening and closing discharge side passages 28 and is sandwiched between two structural bodies (fixed cylinder 81 and cover 4). The first aspect of the invention reduces the number of components constituting the pump housing, enables highly precise overall axial alignment, prevents wobbling of a pump shaft 9 of the pump, increases performance and reliability and reduces cost.

Abstract: A housing for a hydraulic piston machine comprising two shells of part-cylindrical form, the shells connectable together along a parting plane in which the rotating axis of the drive-shaft lies to contain within internal working elements of the machine. Either or both housing shells may be provided with a opening connecting the interior to the exterior of the shell(s) to provide means for fluid distribution of the machine. A non-deformable liner-element located within one or more of said openings for isolating pressurized fluid passing through the machine from coming into direct contact with the housing shells.

Abstract: A hydrostatic piston machine having a housing comprising two shells of a part-cylindrical form, the shells connectable together along a parting-plane in which the central axes of the drive-shaft and cylinder-barrel lie. Each housing element is provided with a number of semi-circular formations and recesses which form pockets or apertures when the housing shells are connected together to provide support surfaces for the working elements of the machine. A cylinder-barrel mounted within a chamber formed between the shells and is provided with a number of cylinders each containing a piston. Fluid-passageways are provided in the housing to receive and supply fluid to the pistons of the machine.

Abstract: A two stage pump has coaxial first and second stage reciprocating pumps with the second stage piston reciprocably driven by the first stage piston. Multiple sets of first and second stage pumps are provided, and the second stage pistons can be returned by supercharge pressure, a loose connection between the first and second stage pistons, or a spring. An accumulator which is charged on a compression stroke and discharged on an intake stroke may also be provided in communication with a pumping chamber to improve the efficiency of a pump.

Abstract: The invention concerns a dual-capacity hydraulic motor. In accordance with the invention, the capacity selector device comprises two valves each having a body with two grooves and a sliding slide valve with only one groove. One application is to the implementation of a low-cost, lightweight motor that is compact in the axial direction.

Abstract: An apparatus for balancing and supporting various loads exerted on the pump cylinder block and associated bevel gear in a radial piston type hydraulic transmission for assuring concentric rotation about the pintle during operation. A hydraulic pressure pad, acting as a hydraulic piston, is located on the outer surface of the pintle at least partially underneath the pump cylinder block hub portion for counteracting the loads exerted against the pump cylinder block and associated bevel gear. A groove circumferentially disposed in the outer surface of the pintle supplies oil to the pressure pad from a bore disposed in the groove and in communication with the high pressure passage of the pintle. The pressure pad is preferably disposed 90.degree. from the input shaft and associated input bevel gear. Additional grooving on the outside circumferential surface of the pintle provides lubrication between the rotating cylinder blocks of the pump and motor, and the pintle.

Abstract: A vibration and noise free pump is disclosed. The pump includes a plurality of cylinders in radial arrangement about an axis. A piston is slidably supported in each of the cylinders. Each of the pistons has a vent opening in addition to a set of inlet openings to admit escape of liquid out of its piston inner chamber into a well with the piston in the compression stroke. With the provision of the vent opening, a surge pressure in each of the pistons has been reducedsed.

Abstract: A pump comprising a number of radial cylinders arranged a given angular distance apart about a drive shaft and each housing including a piston resting radially on a respective pad by virtue of the action of a return spring. The connection between the piston and pad comprises a retainer for preventing in-service detachment of the pad, which rests on a respective flat portion of a cam mounted for rotation on an eccentric portion of the shaft. The force on the pad produced by sliding friction between the pad and the flat portion of the cam and directed perpendicular to the axis of the cylinder is absorbed by the piston.

Abstract: An apparatus for pumping fluid at a substantially constant flow rate, is disclosed. The apparatus contains three transducers which couple one hydraulic fluid to another fluid while preventing contact with said other fluid. The apparatus also contains a timing device for continuously and sequentially withdrawing hydraulic fluid from the first fluid transducer while simultaneously pumping hydraulic fluid to the second fluid transducer, thereafter withdrawing hydraulic fluid from the second fluid transducer while simultaneously pumping hydraulic fluid to the third fluid transducer means, and thereafter withdrawing hydraulic fluid from the third fluid transducer. The timing means preferably includes a plurality of hydraulic cylinders and pistons, and a cam assembly.

Abstract: An internal combustion engine has at least one piston (15, 16) which moves back and forth in a cylindrical piston bore (13, 14) and drives a rotationally supported crankshaft (30) through a connection rod (24, 25). The piston bore (13, 14) is arranged in a rotary element (10) rotationally supported in a housing (1). The rotary element (10, 17) and crankshaft (30) are cinematically coupled through a gear (40, 41, 42, 43) so that they can rotate in opposite directions (60 or 61). The piston bore (13, 14) arranged in the rotary element (10) communicates with an opening (20, 21) in the outer surface of the rotary element (10, 17) which moves past an inlet opening (50) and an outlet opening (51) in the housing (1) during rotation of the rotary element (10).

Abstract: The invention proposes a fluid handling device, which may be a pump, in which arrangements are provided to make the device able to handle high pressure of more than one thousand atmospheres and able to seal at such high pressure for a considerably long life time of the device. For the obtainment of such a performance, a piston shoe arrangement has a part-ball formed portion with an outer face which is guided on a cylindrical inner face, while the piston shoe at the same time pivots around a center which is located in the pistons-head. Sealing means are provided to faces of plates, membranes or pistons to reduce leakage or to reduce the negative effects of deformations under high pressures. In this relation a thrust body may be axially moveably provided in a thrust chamber and obtain thereby a novel and effective sealing of membranes and faces.

Abstract: A radial cylinder hydraulic pump or motor has radial pistons each provided with a guide pad urged against the cylindrical inner surface of a guide element. A continuous series of rollers cover the cylindrical inner surface and are interposed between such surface and the guide pads. The rollers are prevented from coming in contact with each other by a number of auxiliary smaller rollers. Between each piston and its respective guide pad there is interposed a sliding member which is slidably mounted on the pad along a tangential direction.

Abstract: The ease of assembly of a radial plunger pump is improved while preventing an external leakage of liquid. A pump housing 2 in the form of a cylinder having a closed bottom contains a pintle 4 therein, which is secured to the bottom of the pump housing 2 by a bolt 6. A rotor 8 is rotatably fitted around the pintle. The rotor is formed with a plurality of radially extending cylinder bores 8a, in each of which a plunger 10 is slidably disposed. A guide ring 16 is disposed around the rotor. A motor 20 is fastened to and secured to the opening of the pump housing, and includes a drive shaft which is connected to the rotor to drive it for rotation. By allowing parts to be assembled into the pump housing in one direction, the ease of assembly is improved while preventing a liquid leakage.

Abstract: A hydraulic system including hydraulic units serving as wheel motors and pumps is disclosed. The hydraulic units include a stationary member supporting cylinders with piston assemblies reciprocating therein. The piston assemblies have bodies and follower assemblies which follow lobes on a rotary cam. The piston assemblies serve both as pistons and as timing valves for controlling the flow of fluids. The piston assemblies may have either undercuts or internal passages in their bodies. The follower assemblies have compliant springs elastically positioning rollers between arms of a yoke to allow lateral movement of these rollers relative to the arm of the supporting yokes. Sealing mechanisms are provided which seal between the rotary cam and the stationary member to form an annular scavenge chamber. At least one sealing mechanism has a non-rotating annular intermediate member which pilots relative to the rotary cam. A static seal accommodates radial movement between the stationary and intermediate members.

Abstract: A suction-restricted radial piston pump is described, in particular for use with automotive vehicles. The pump delivers a flow constant over a broad speed range and involving low losses in output and generating only negligible noise. In one embodiment, a control slot (13), on the pressure side, is subdivided into several grooves (27,28) which at least in part are in communication, through check valves (32), with the pressure connection (20). An alternative embodiment provides a shape of the pressure-sided control slot in which the introducing end thereof is comparatively narrow to reduce noise at a high speed and the outlet-sided end thereof with a wider width sufficient to meet the required output. According to a third embodiment, the suction-sided slot (12) is provided with a narrow width section and a subsequent wider width section.

Abstract: A piston pump is constructed so that the displacer or piston working strokes occur in sequence with varying phase differences which have a non-integral ratio to one another. Thereby, the risk of excitation of noise or resonance vibrations is greatly reduced.

Abstract: A hydraulic regenerative braking and four wheel drive system for a vehicle is provided. The system includes a fluid accumulator, hydraulic units locating within vehicle wheels and comprising stationary members and cooperating rotary cams, filter assemblies, and spool valves for controlling the flow of fluid in the system. The system may be operated in a regenerative mode wherein at least some of the hydraulic units operate as pumps to provide high pressure fluid to the accumulator during vehicle deceleration or braking, and wherein at least some of the hydraulic units operate as motors, receiving high pressure fluid from the accumulator during vehicle acceleration. The system may also be operated in a four-wheel drive mode wherein a pair of hydraulic units, connected to a pair of mechanically driven wheels, act as pumps to drive a pair of hydraulic units, acting as motors, to rotate a pair of non-mechanically driven wheels.

Abstract: The invention relates to a mechanism comprising: a cam; cylinders; pistons; two main enclosures containing feed fluid and exhaust fluid; a fluid distributor; and balancing enclosures communicating with distribution ducts included in the distributor. According to the invention, the distributor includes a face facing a reaction face secured to the cam or to the cylinder block, the balancing enclosures being constituted by chambers that open out into said end face and by a sealing device received inside the chamber and bearing against the reaction face. One application lies in providing a range of compact motors.

Abstract: A hydrostatic pump and motor combination is disclosed including a rotor having radially disposed cylinders containing reciprocatably disposed spherical balls therein. A free outer race is eccentrically disposed about the rotor to define either a pump or motor. The cylinders are tilted relative to the center of the rotor to reduce side torque thrust loads on the cylinders. Also disclosed are a hydrostatic pump and motor including matching spherical slipper shoes and spherical free outer race. Hydrostatic thrust cups are disposed within the cylinders to reduce frictional losses, wear, and leakage. The thrust cups include hydrostatic means for supporting the balls in the cylinders, thereby self adjusting in response to fluid pressure and centrifugal loads.

Abstract: A piston machine (10) has two pistons (42, 44) which are reciprocatable in two cylinders (20, 22) and which, in the first and second working chambers (50, 52) thereof, can be subjected to a working medium. The pistons are connected to a crankshaft (30) via two connecting rods (38, 40) which are pivotally connected to one and the same crank pin (36). The interior of the crankcase (18) forms a third working chamber (54). The crankshaft (30) is formed as a rotary slide valve which in operation of the piston machine (10) connects the first working chamber (50) to the third working chamber (54) and the second working chamber (52) to a working medium supply or discharge opening (14, 16). The piston machine can be used selectively as an engine (e.g. as an expansion motor operated with compressed gas) or as a working machine (e.g. as a compressor). The opening and closing times can be controlled exactly. For generating the same power, less working medium is required than in the prior art.

Abstract: An eccentric anti-friction drive for fluid power apparatus is disclosed wherein the eccentric element comprises a tubular cup or sleeve made by deep drawing a hardenable steel material. The eccentric element comprises two cylindrical peripheries disposed eccentrically with respect to one another. One of the cylindrical peripheries is fitted to the rotating member of a prime mover and the other cylindrical periphery comprises the inner or outer race of an anti-friction bearing of the anti-friction drive.

Abstract: The invention relates to a hydraulic circuit for supplying at least one motor incorporating "disengageable" pistons, comprising a fluid distributor valve obturating, in one of its positions, the supply and exhaust conduits of said motor.According to the invention, the fluid distributor valve comprises a shuttle valve presenting two inlet connections and one outlet connection, and, in said position, establishes communications of the supply conduit with one of the inlet connections, of the exhaust conduit with the other inlet connection, and of a conduit evacuating fluid towards a reservoir with said outlet connection of the shuttle valve.One application of the invention is the production of a vehicle translation circuit comprising a "disengageable" assistant motor.

Abstract: A hydrostatic machine comprises a shaft, a rotor arranged on a shaft for rotation and having radially extending opening, a plurality of pistons arranged in the radial openings and having ends extending outwardly beyond the openings, a displacement curve arranged so that the ends of the pistons slide on the curve, channels for communicating the openings with a pressure medium and including passages which open laterally at the rotor, and a device for compensating an axial thrust applied by a pressure medium to the rotor and including pressure medium-actuated additional pistons.

Abstract: This invention relates to a fluid mechanism with two cylinder capacities, comprising a distributor valve defining first and second enclosures containing supply and exhaust fluids comprising two groups of distribution conduits, and a device for selecting the cylinder capacity, constituted by a bore and a slide element for selection. According to the invention, a first and a second connection conduit connect the first and second enclosures to the bore and open out between transverse planes; distribution conduits open out in the bore between these planes; and the slide element comprises a groove contained between said planes and establishing communication between the distribution conduits and the connection conduit. One application of the invention is the production of a compact motor.

Abstract: An hydraulic centrifugal piston motor having mulitple piston circumferentially disposed at right angle to shaft axis, having a rotational power moment that occurs twice each revolution for each cylinder. The power stroke for each cylinder would occur for a duration of 90 degrees twice during each 360 degree operating cycle. Hydraulic input is applied to opposing pairs of cylinders and overlap of successive power strokes provide rotational balance and cancels net reaction forces applied to the bearings. Another feature of the motor would be the particular design of the power transfer device. The thrust of the power transfer device is applied axially to the drive shaft providing a smooth transfer between the hydraulic input power and the mechanical output power.

Abstract: A radial piston engine is provided having recesses in the area of movement of the rollers, adapted to receive roller sections on both roller end faces. For guiding the roller end faces, oppositely located guide surfaces are milled in the cylinder block for said rollers.

Abstract: A reversible flow pump (12) comprising: a first port (16) and a second port (20); a rotor (60) comprising a plurality of pump elements (74-80) movable through a fill mode and a discharge mode, a pump chamber (140) associated with each pump element (74) which are respectively filled and discharged; a ported shaft (30) rotatable between a first position and a second position, for carrying fluid to and from the various pump chambers (140), such that when in the first position fluid received at the first port (16) is communicated to fill each pump chamber (140) during the fill mode, at least a portion of such fluid is discharged therefrom and communicated to the second port (20), and wherein in the second position fluid flow is reversed. A brake system incorporating the pump is also disclosed.

Abstract: The invention relates to a pressure fluid mechanism comprising: a reaction cam; a cylinder block mounted to rotate relative to the cam and including a central void and an axial extension enabling it to be fixed to a support; and an internal fluid distributor valve constrained to rotate with the cam by a link mechanism which extends inside the central void, the cylinder block and its extension constituting an assembly which is interposed between the cam and the internal fluid distributor valve. According to the invention: a) a braking device is disposed at the end of the mechanism towards which the link device extends, the braking device being disposed between the cylinder block and the cam and including a chamber containing brake disks, which chamber is delimited by a cover; b) the link mechanism is constrained to rotate together with the cover of the chamber containing the disks; and c) the cover of the chamber is constrained to rotate with the cam.

Abstract: A hydraulic wheel motor and pump are provided for use with a motor vehicle having a pair of mechanically driven wheels and a pair of non-mechanically driven wheels. The hydraulic pumps cooperate with the mechanically driven wheels, and the hydraulic motors are coupled to the non-mechanically driven wheels. The pumps and motors are diagonally connected to one another to create a four wheel drive vehicle. Also shown is an apparatus and method for independently controlling the tractive force of the vehicle wheels during a turning maneuver.

Abstract: The invention relates to a radial piston engine, particularly a radial piston motor comprising a cylinder block within which a plurality of pistons and rollers are reciprocally mounted for cooperation with a cam path provided by a cam disc. Detent means are used to releasably locate the cylinders and rollers in a position corresponding with the lower dead point position of the pistons.

Abstract: This invention relates to a hydraulic mechanism comprising a cam; a cylinder-block mounted to rotate with respect to the cam; a plurality of cylinders arranged in this cylinder-block; a plurality of pistons mounted to slide inside a cylinder; a plurality of rollers for abutment of the pistons on the cam, each roller being mounted on a piston, rotating by means of a bearing for rotation, being axially defined by two transverse faces, and being capable of penetrating, at least partially, inside the cylinder in which this piston slides, the end of the piston comprising two recesses corresponding at least to the intersection of the cylindrical surfaces of the roller and of the piston, being open in the upper part of the piston; and two wedging pieces which are each disposed in a recess between the roller and the cylinder, in order to ensure axial wedging of the roller parallel to its axis of rotation.

Abstract: Radial piston machine as a fluid pump or fluid motor comprising an inner valving trunnion, an outer cam ring and at least a cylinder block arranged therebetween and having reciprocating pistons, which tilt when the cylinder block rotates. The pistons have spherical heads and crowned piston rings along the biggest diameter or equator in order to create each an oblique sealing plane when the respective piston is tilted. Pressure in each chamber limited by said oblique sealing plane will give rise to a direct transformation of torque and fluid pressure. The valving trunnion has enlarged sealing fields to get a precompression of the fluid between high and low pressure fluid areas in order to avoid excitation of noise. The machine design can be for constant or variable displacement. In case of variable displacement, the sinusoidal curve of piston travel is adjusted for a variable preceeding angle (.epsilon.) by adding a constant eccentricity (c) so that the angle of the separation (.tau.

Abstract: A variable-stroke crank mechanism includes a crankshaft rotatably mounted in a casing and having an eccentric crankpin, and a plurality of fluid pressure actuators disposed substantially radially with respect to the crankshaft, for pressing the eccentric crankpin to rotate the main shaft and the casing relatively to each other. The fluid pressure actuators are selectively supplied with a working fluid. An eccentric collar is rotatably mounted on the crankpin and operatively coupled to the fluid pressure actuators. The eccentric collar having an axis which is eccentrically displaced with respect to the axis of the crankpin. The crankpin and the eccentric collar are arrested in their respective angular positions by intermeshing internal and external gears. The crank mechanism may be incorporated in a plunger-type hydraulic unit, which may also be incorporated in a hydromechanical continuously variable transmission.

Abstract: A radial piston and cylinder compressed gas motor is disclosed which is particularly suited for use where economical power sources are required. The motor includes a cylinder block having a plurality of radially extending cylinders open at their outer ends to radially extending passages and having exhaust ports open when associated pistons are adjacent their bottom dead center positions. Such passages extend to a valve system provided on the crank of the motor which functions to supply compressed gas to selected cylinders while connecting other cylinders together so that gas is exhausted from cylinders containing extending pistons to open exhaust ports in other cylinders. This minimizes back pressure to resist motor operation. The crank is formed of two generally cylindrical members and can be produced without eccentric machining or grinding operations.

Abstract: A radial piston pump is provided with a plurality of valve/piston cartridges. Each cartridge includes the piston and at least one of the valves connecting the piston to the inlet and outlet passages of the pump. The bearings for the main rotor are pre-loaded using a threadedly adjustable end guill. Once adjusted, the end quill is held in location by a pin or the like. The rotor itself is provided with counterweights to balance the eccentric cam surface. These features allow construction of a pump housing which is substantially a single unit, rather than two pump halves. A significant reduction in the number of machined bores also is obtained.

Abstract: The present invention is an expander band for use in hydraulic pumps, motors, and hydrostatic transmissions. The band has a plurality of elongated slots located circumferentially which receive slippers attached to pistons. One reduced dimension slot fixes the position of a slipper relative to the expander band while the other slippers move within the elongated slots. The fixed slipper limits the range of movement of the other slippers relative to the band, and thus the slippers avoid abutting the side ends of the elongated slots.

Abstract: A fluid motor which is useful as a pump or as an hydraulic or pneumatic engine with a high torque low speed output. The fluid motor (10) comprises at least one drive disc (24) having a generally curved outer surface (42), at least one reciprocably mounted piston (26), the outer curved surface of the drive disc (24) being formed of alternating crests (44) and valleys (46) and there being provided a plurality of rollers (48) which are arranged to engage with the curved surface (42) of the drive disc (24), the number of rollers (48) and the number of crests (44) being different by at least one. Feeding fluid to the piston (26) causes the piston (26) to reciprocate so that the disc (24) is caused to undergo orbital movement and the housing (12) is thus caused to rotate.

Abstract: A fluid-driven multi-cylinder operating unit, particularly for tire removal machines comprising a rotor (3) with a radial series of equidistant coplanar, single-acting cylinder-piston units (5, 6) fed in succession by an annular distributor (15), with their rods interacting, by way of end rollers (9), with a track (10) which is coaxial to the rotor (3) and fixed to the stator (1) and which includes a succession of semicylindrical cavities (11) in a number less than the number of cylinder-piston units (5, 6) and joined together by cusps (12); there being provided a valve for throttling the pressurized fluid feed pipe to said cylinder-piston units.

Abstract: The invention relates to a pressurized fluid mechanism comprising a plurality of pistons (14) and a plurality of different cylinder capacities. A particular cylinder capacity is selected by means of two identical slide valves (17, 18) which serve selectively to neutralize either a first overall cylinder capacity (45a) or a second overall cylinder capacity (45c), or both or neither of said first and second cylinder capacities. One application of the invention is to providing an efficient and compact motor which is cheap to produce.

Abstract: Continuous combustion heat engine including a compressor (12), combustor (14) and expander (16) which operates on a Brayton cycle with positive displacement pistons (90) in the compressor and variable expansion ratio pistons (190) in the expander. Compressor (12) delivers compressed air to the combustor (14) where it is mixed with fuel and combusted to produce expansion gases for the expander (16). Power input to the compressor and power output from the expander are achieved through the radially disposed pistons (90,190), connecting rods (94), cranks (98), crank shafts (100), planetary gears (104), sun gears (106) and sun gear connectors (114) which rotatably secure the sun gears (106) and manifolds (110,166) together. The pistons (190) for the expander have positive displacement sections (192) and free floating sections (200) for the variable volume ratio capability.

Abstract: A positive-displacement fluid motor wherein a rotating member rotated by pressurized fluid flows to and from fluid chambers can be stopped at a desired one of at least one predetermined angular position by a torque produced by the motor itself. The fluid is supplied into at least one advancing fluid chamber of the fluid chambers which acts to rotate the rotating member in an operating direction of the motor, while causing the fluid to be discharged from at least one reversing fluid chamber of the fluid chambers which acts to rotate the rotating member in a direction opposite to the operating direction, if a motor stop command is generated when the desired angular position is ahead of a current position of the rotating member in the operating direction of the motor.

Abstract: A radial-piston machine has a rotor formed with a plurality of cylinders, wherein pistons are reciprocable. Each such piston is formed on its radially outer end with a reception seat and a pivotable portion of a respective piston shoe is engageable on the seat. The piston shoes ride on an eccentric cam in a housing of the machine. Each such piston shoe may move radially into and out of engagement with the respective piston. A pair of end members axially flank the piston shoes to prevent their escape in axial direction. The former requirement to connect the piston shoes pivotably to the pistons is eliminated by the application of seal- and support-faces in the rotor, a stroke guide face on the cam, outer faces and end faces on the piston shoes and innermost faces on provided end members, whereby the piston shoes are retained between the mentioned faces, but permitted to otherwise free movement between the pistons, rotor, end members, and the cam.

Abstract: The disclosure teaches a novel radial engine. In accordance with the teachings of the disclosure, the radial engine includes a housing and a plurality of equally spaced openings disposed in a ring-like arrangement on the periphery of the housing. A respective piston and cylinder arrangement is located in each opening, and the piston rod of each piston and cylinder arrangement extends inwardly from its respective piston through its respective opening. A shoe means is pivotally attached at the other end of each piston rod, and a connecting ring is mounted for circular translation motion on the crankshaft within the housing. A respective channel or guides extend radially inward in the housing in line with each piston rod to permit radially inward motion of the shoe means and to guide the connecting rod block in this motion. Each shoe means is guidably connected to the peripheral edge of the connecting ring.

Abstract: The invention relates to a hydraulic motor having an undulating cam and at least one large and one small selectable operating cylinder capacity. In the motor, cylinder feed orifices (41a, 42a) are distributed around the circumference of a circle about the axis of rotation (5), and the small cylinder capacity corresponds to an irregular angular distribution of active cylinder orifices (41a) which continue to be fed. This configuration makes it possible to provide a constant velocity motor with at least two different cylinder capacities and which is mechanically long-lasting.

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 transferred 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: This invention relates to a hydraulic mechanism having a cylinder block comprising cylinders, pistons mounted in these cylinders, and supporting rollers for abutment on a cam with respect to which the cylinder block is mounted to rotate. The mechanism for holding each roller in position with respect to a corresponding piston comprises two distinct supports which each abut on the inner surface of the cylinder, are maintained in position along the axis of the piston, have their angular orientation with respect to this axis constant and possess a face for abutment against an end face of the roller. One application of the invention is the manufacture of a compact engine.