Abstract: A molten metal pump includes an impeller, a pump base housing at least partially enclosing the impeller, a shaft connected to the impeller, a motor connected to the shaft, a motor mount plate for supporting the motor; and a post for connecting the motor mount plate to the pump base housing. The molten metal pump can include a connector that connects the post to the motor mount plate. The molten metal pump can include a socket for connecting the shaft to the motor. The shaft can comprise an assembly including an elongated metal rod having a first end and a second end and a metal non-circular drive member attached at the second end of the elongated metal rod.

Abstract: A radial piston device includes a housing and a pintle fixed thereto that includes an inlet and an outlet, each aligned with a pintle axis. A rotor is rotatably disposed around the pintle and includes radially oriented cylinders. A piston is axially displaceable in each cylinder and includes a head defining a spherical contact surface. A thrust ring is rotatably disposed within the housing about the rotor and is in contact with each piston, such that a rotation of the rotor rotates the thrust ring. An inner surface of the thrust ring defines a toroidal contact surface. A contact location between the spherical contact surface and the toroidal contact surface varies as the rotor rotates about the pintle. A drive shaft is engaged with the rotor, such that a rotation of the rotor rotates the drive shaft.

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 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 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 hydraulic machine which can exchange hydraulic fluid pressure with rotational motion of an input/output means, having a radial arrangement of a plurality of hydraulic piston and cylinder assemblies about a crankshaft, the hydraulic cylinder and piston assemblies being longitudinally spaced along the crankshaft; and a means for varying eccentricity of the crankshaft whereby reciprocal motion of the pistons within the respective hydraulic cylinders is consequential to rotational motion of the crankshaft about the longitudinal axis of the crankshaft.

Abstract: Devices for adjustably controlling a flow of fluid through a common passage and through first and second auxiliary passages are disclosed. The flow control devices may be used for controlling the steering of a vehicle having independently controlled driven structures, such as wheels. Various other applications of these devices and related methods are also disclosed.

Abstract: A hydraulic motor having radial pistons, and comprising a cam, a cylinder block and a distributor. The cylinders of the cylinder block are connected to communication orifices (32A) situated in a communication face of the cylinder block, while the distributor has a distribution face in which distribution orifices (21A, 23A) are provided that are suitable for communicating with the communication orifices for rotating the motor. The cam is provided with a plurality of lobes (50, 50?), each of which has two ramps (51, 52), each ramp corresponding to a distribution orifice (21A, 23A). The edge of each of at least certain communication orifices (32A) has at least one notch (54A, 54B) suitable for establishing a small section of communication with a distribution orifice. The invention applies in particular to hydraulic motors having radial pistons for which the ratio between the number of cylinders and the number of cam lobes is in the vicinity of 1.

Abstract: A compressed fluid driven downhole cam motor (1) of the type used during drilling/service operations in the ground, comprising an intermediate casing (4), a distributing valve (26), a rotor (18) and two or more pistons (48) arranged radially and distributed with equal or unequal separation about the central axis of the rotor (18), whereby the pistons (48) located in the same radial plane constitute a set of pistons, and where two or more sets of pistons are arranged side by side along the longitudinal axis of the rotor (18).

Abstract: A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being connected to the discharge side with a bypass connection by a valve arrangement for a selected number of engine pistons. The control circuit provides a space-saving way of ensuring that the changeover between speeds occurs smoothly and in such a manner to preserve the individual components as far as possible. To this end, at least one intermediate switching position, in which the delivery side is throttled to the discharge side, i.e. connected by a diaphragm-type arrangement, is provided in front of valve arrangement between the two end switching positions. The valve arrangement is preferably driven such that a valve body can be moved through the intermediate switching position at a controlled speed.

Abstract: A rotary power device of the swinging piston type has a cylindrical rotor mounted between internal and external portions of a stator. The internal stator provides intake and exhaust channels and may hold an igniter. The external stator includes two axially adjacent cam tracks with diametrically opposed eccentricities with respect to the axis of rotation. The rotor includes two axially spaced sets of sector-shaped compartments arranged at equal angular intervals around the inner stator, where each set is axially aligned with a respective cam track. Each compartment is open at the periphery of the rotor and has an inner opening aligned with ports in the internal stator. A sector-shaped piston mounted in each compartment pivots about an axis at one vertex of the compartment. Each piston includes a roller follower for engaging the respective cam track as the rotor rotates.

Abstract: A rotary power device of the swinging piston type comprises a cylindrical rotor mounted between internal and external portions of a stator. The internal portion of the stator provides intake and exhaust channels and may hold an igniter. The external portion of the stator includes a middle portion with an oval cam track. The rotor includes a multiplicity of sector-shaped compartments arranged at equal angular intervals around the inner stator. Each compartment is open at the periphery of the rotor and has an inner opening to the central bore in alignment with ports in the central internal stator. A sector-shaped piston is mounted in each compartment for pivotal motion about a pivot axis at one vertex of the compartment. Each piston includes a roller follower for engaging the oval-shaped cam track as the rotor rotates, which causes angular reciprocation of the pistons within the compartments while performing intake and exhaust cycles through inner openings.

Abstract: An output shaft is constituted by a plurality of rotary shafts which are disposed on the same axial line so as to be rotatable relative to each other. A cam ring which fixedly encloses one of said rotary shafts has a cam surface with radial projections and recessions on an inner peripheral surface of the cam ring. A cylinder block which is mounted on said one of the rotary shafts has formed therein a plurality of cylinders for containing in each thereof a piston which is radially moved by sliding contact with the cam surface. A sun gear is mounted on said one of the rotary shafts. Planetary gears are mounted on remaining at least one of the rotary shafts so as to be rotatable in gearing mesh with the sun gear and an internal gear which is fixedly mounted around the sun gear.

Abstract: Pressurized fluid motor comprising a casing, a cylinder block, a cam, an internal fluid distributor and a selector. The bore of the selector has four grooves. Two of them are communication grooves each connected to a main (feed or exhaust) power duct and to a connection duct, the connection ducts being themselves connected to different groups of distribution ducts. The other two grooves of the bore are branch grooves respectively connected to an additional (feed or exhaust) power duct and to a third connection duct. The slide of the selector comprises at least a first selection groove which is adapted to establish communication between the two branch grooves. By modifying only the shape of the slide, and possibly that of the bore of the additional duct, the selector can provide different functions.

Abstract: The present invention relates to a pump, more particularly a radial piston pump, including at least two pump pistons (10) with an associated working chamber (13) each, wherein the working chambers (13) are connected to suction lines (4) by way of suction valve devices (8) and to a joint pressure line (5) by way of pressure valve devices (9), wherein at least one of the suction valve devices (8) opens during the pressure stroke in dependence on the pressure in one of the associated lines (4, 5), and wherein at least one of the suction valve devices (8) opens during the pressure stroke in dependence on the pressure in the pressure line (5).

Abstract: A pump includes a housing defining a cavity, at least one bore, a bore inlet, and a bore outlet. The bore extends from the cavity to the outlet and the inlet communicates with the bore at a position between the cavity and the outlet. A crankshaft is mounted in supports and has an eccentric portion disposed in the cavity. The eccentric portion is coupled to a piston so that rotation of the crankshaft reciprocates the piston in the bore between a discharge position an intake position. The bore may be offset from an axis of rotation to reduce bending of the piston during crankshaft rotation. During assembly of the pump, separate parts of the housing can be connected together to facilitate installation of internal pumping components. Also disclosed is a method of reducing vapor lock by mixing vapor and liquid portions of a substance and introducing the mixture into a piston bore.

Abstract: A harvesting machine includes a feed mechanism configured for being driven in a forward direction to feed crops into the harvesting machine and a reverse drive mechanism for driving the feed mechanism in a reverse direction. The reverse drive mechanism includes a cam surface, a plurality of cam engagement members, and a plurality of pistons connected to the engagement members. One of the cam surface and the plurality of cam engagement members is operatively coupled to the feed mechanism. Controlled movement of the pistons in a first direction forces the cam engagement members into engagement with the cam surface to drive the feed mechanism in the reverse direction. Movement of each of the pistons in a second direction allows the feed mechanism to rotate in the forward direction.

Abstract: An adjustable rotor and/or a radial piston machine which may utilize an adjustable rotor. The rotor has a primary eccentric rotatable around an axis and a secondary eccentric adjustable in position relative to the primary eccentric. The radial piston machine includes a plurality of piston cartridges arranged radially around the axis and both high pressure and low pressure fluid distribution systems. Multiple units may be axially coupled. A single unit may handle a variety of fluids in various combinations.

Abstract: A hydrostatic bridge including two hydraulic motors each having two distinct operating cylinder capacities, both motors sharing an overall casing. The bridge has four main ducts of a first type (feed or exhaust) and two main ducts of a second type (exhaust or feed). The overall casing has three upstream ducts respectively connected to the first and second main ducts of the first type themselves connected to distribution ducts of the first motor, to third and fourth main ducts of the first type, themselves connected to distribution ducts of the second motor, and to first and second main ducts of the second type, themselves connected to distribution ducts of both motors. The bridge includes an anti-spin device capable of selectively reducing the flow rate in the first upstream duct and in the second upstream duct for selectively correcting spin of the first and second motors.

Abstract: The invention relates to a hydraulic drive system comprising a plurality of hydraulically driven piston units with cam rollers, which are disposed to act against a wave-shaped cam profile of a cam curve element, so that linear movement of the cam rollers against the cam profile produces a relative driving movement between the cam element and the piston units. The characterizing feature of the invention is that the drive system is composed of separate, assembled cam curve element modules and separate assembled piston units.

Abstract: The invention relates to a hydraulic motor having a plurality of cubic capacities, and provided with individual cubic-capacity selectors associated with at least some of its cylinders, each selector being provided with a control member. According to the invention, the control member coupled to each of said individual selectors can be activated only in that range of positions of the cylinder associated with said individual selector which corresponds to the axis of said cylinder being in alignment with the crest of one of the undulations, and to positions that are angularly adjacent to the position in which said alignment is obtained. An application of the invention is to making a motor that is mechanically strong.

Abstract: A radial hydrostatic motor (radial piston machine) has a cylinder spider rotationally fixed and secured against axial displacement on a shaft and having a plurality of radial bores with pistons and sliding blocks that slide on the inner face of a hub ring or bushing. The bores communicate through control slots with high/low pressure delivery channels that open laterally into the cylinder spider in order to control the hydraulic media flow rate. Two mutually spaced rotors have bores with intercommunicating opposite control slots. Between both rotors is provided a housing intermediate partition having control disks opposite to the rotors and provided with channels which correspond to the control slots.

Abstract: A slipper guide for use in radial piston type hydraulic pumps and motors, especially those utilized in hydrostatic transmissions. The slipper guide provides an annular path for the slippers, guiding and maintaining the slippers engaged with the inner circumferential surface of the track ring as the slippers are rotated within the track ring by the cylinder. The slipper guide consists of two plates axially attached to the track ring and fixed relative thereto. Each plate includes an annular, axially inwardly extending projection forming an annular surface upon which an under surface of an outer portion of the slippers rests. The annular projection positions and maintains the top surface of the slippers against the inner circumferential surface of the track ring.

Abstract: A pump with axial thrust compensation having an external housing, a main shaft within the housing to which are axially fixed two spaced apart rotors. The main shaft supports the rotors apart at respective collars against which the rotors are clamped. Each rotor including a series of radially displaceable elements within respective bores. The stroke rings for the rotors are rigidly attached to each other by a respective bearing shaft. A respective stroke ring around each rotor for moving the displaceable elements into and out of the bores. A respective control slot into each of the bores in the rotor and the control slots of each rotor extending laterally toward the other rotor.

Abstract: A variable-stroke crank mechanism has a crankshaft rotatably supported in a casing for relative rotation about an axis with a crankpin displaced out of alignment with the axis. An eccentric collar is rotatably mounted on the crankpin for revolving around the axis in response to the relative rotation of the crankshaft with respect to the casing to reciprocally move an actuator relative to the casing. A stroke adjusting mechanism for adjusting angular displacement of the eccentric collar on the crankpin comprises an internal ring gear integral with the eccentric collar concentrically with the crankpin, a planetary pinion rotatably mounted on the crankshaft and meshing with the internal ring gear, a sun gear meshing with the planetary pinion, and a stroke adjusting shaft rotatably disposed axially in a portion of the crankshaft and coupled to the sun gear, whereby the stroke adjusting shaft is adjustable in angular displacement to adjust a stroke of reciprocating movement of the actuator.

Abstract: A hydrostatic transaxle includes a hydrostatic transmission with a pump and motor, the pump and motor each including a track ring radially surrounding a cylinder in which are disposed a plurality of pistons rotatable on a fixed conduit. The motor track ring includes radially extending lugs disposed 180.degree. from each other that are captured between the upper and lower transaxle casing halves thereby preventing axial or radial movement of the motor track ring.

Abstract: A rotary internal combustion engine having spherical pistons mounted in radially arranged cylinders formed in a stacked series of rotatable cylindrical members. A stationary cam surface is located around the rotatable member to maintain contact with the pistons. A stationary member located with the rotatable cylindrical member provides fresh fuel mixture, withdraws exhaust products, and provides ignition as required. Power is taken from the rotating cylindrical members at the end of the engine through a planetary gear train.

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: The radial gear driven piston pump (10) comprises a stationary pintle or pin (40) having a rotatable rotor (30) mounted thereon. The rotor (30) and pintle (40) are disposed within a pumping bore (18) that is eccentrically aligned relative to bore extensions (28) receiving the pintle (40). The rotor (30) is driven by an offset motor (12) which engages a periphery of the rotor (30). The pintle (40) has therein two pairs of longitudinal passages comprising supply (46, 53) and discharge (47, 54) channels which communicate with respective intake (41, 43) and exhaust (42, 44) ports within the pump housing (16). The rotor (30) has sets of axially offset pistons (90, 100) received within piston cavities (93, 93'). Each set of piston (90, 100) comprises a metal piston cap (95) having a central opening (90) which receives a longitudinal extension (97) of a piston sealing ring (98).

Abstract: A fluid pump has two pairs of rectangular oppositely-disposed pistons. The pistons of each pair travel simultaneously in opposite directions at the same speed and over the same distance. Valving is provided by a reciprocating port plate, in face-to-face relation to the piston, driven in a circular path from two spaced crankpins and which in turn drives the associated piston. The sliding movement of the port plate controls the alignment of inlet and exhaust ports in the piston and port plate. The excursion or "throw" of the pistons can be varied from zero to maximum. A crankpin throw-adjusting mechanism simultaneously adjusts the throw of each crankpin, some in one direction, some in the opposite, so that all chambers are automatically adjusted for varying, but always identical, displacements. Self-lubricated seals between the piston and chamber walls are spring loaded, by an elastomerically sealed structure having non-linear deflection-to-force characteristics.

Abstract: A gearbox for a rotary, mineral cutting head, comprises a casing housing speed reduction gearing and also a portion of a drive shaft supported by first and second, spaced-apart bearings, with at least one radially extending cylinder having a closed inner end and an open, outer end provided in said drive shaft and a reciprocable piston partially housed in said cylinder with a fluid seal between said piston and said cylinder; a variable volume, pressure-generating chamber defined between a radially inner end of said piston and a closed, inner end of its cylinder; a ring surrounding said drive shaft and having an inner profile and with a radially outer end of said piston in contact with said inner profile and with said piston.

Abstract: The invention relates to a piston machine comprising a plurality of pistons and changeable piston displacement for varying the torque and speed. The pistons are connected via control bores and distributor passages in the distributor of the machine to a high pressure and low pressure connection. To reduce the displacement a switching valve is provided via which the inactive pistons are connected together via their distributor passages and also possibly subjected to an external very low servo pressure or tank pressure. This reduces the frictional losses, increases the efficiency and avoids flow losses of the valve.

Abstract: A fluid machine such as a pump, compressor, engine, motor or transmission has working chambers in a rotor and a central rotor-hub is provided in the rotor for the reception of a control pintle therein. The control pintle has control ports for the control of flow of fluid into and out of the working chambers of the rotor. Pressure fields form in the clearance between the rotor hub and the control pintle especially around the control ports. Leakage flows from the pressure fields through portions of the clearance between the rotor--hub and the control pintle which reduces the efficiency of the machine. Therefore means are provided in the control pintle to press those portions of the faces of the rotor hub and of the control pintle, which have those local pressure fields, together or to narrow the clearance between these faces in the respective areas where those pressure fields are located in order to reduce the leakage through the clearance between the faces of the rotor hub and the control pintle.

Abstract: A hydraulic radial piston machine with steplessly adjustable volumetric displacement and piston stroke has a bank of pistons with axes in a common plane transverse to the shaft and machine axes. A radially displaceable supporting member pivotably connected to a shaft longitudinal portion turnable from the machine longitudinal axis supports the pistons. The longitudinal portion is pivotably connected at one end to a further longitudinal shaft portion. The second end connects to a turning link transmission which rotates. Rotation of the first--mentioned longitudinal shaft portion causes the supporting member to travel a circular path around the machine axis. A force--loaded translating operating displacing member steplessly varies the diameter of this circle to steplessly adjust piston stroke.

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

Abstract: A radial piston machine wherein fluid flows through the cylinders which are provided in a rotor, the disclosure provides a radial bearing in the middle between a plurality of at least two radial cylinder groups. Thereby the former bearings which were provided on the ends of the rotor can be reduced to smaller sizes to carry a lower radial load. The provision of the bearing in the middle of the rotor prevents the former miniturization of the control bodies on the ends of the rotor. The control bodies can now be radially enlarged and the restriction of the flow through quantities of fluid through the control bodies is overcome. The devices are now able to operate with a better efficiency and power. In order to obtain these features the medial radial bearing in the middle between the cylinder group must be of the specific structures of this patent application.

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 hydraulic motor either of the radial or axial piston type is used for swivelling a hanging load about an upright axis. The motor has a distributor for controlling the flow of hydraulic fluid to the input and drain ducts of the motor. The motor further has hydraulic ducts extending from the stator to the rotor for transmitting fluid required for operation of the actuator of a gripping device or bucket. The distributor floats, so that radial and axial play as well as deformation of the rotor relative to the stator may be taken up without stress. At least some of the hydraulic ducts pass through the distributor, connections being made by suitable rotary transmissions and connecting points within the motor.

Abstract: A general purpose fluid displacement device for use as an external combustion engine, a compound expansion engine, a hydraulic pump, or as an air compressor. At least one bank of circumferentially spaced pistons are operably connected to and radially disposed about a rotor member that is eccentrically disposed to an imaginary circle collectively defined by said pistons such that the amount of eccentricity of said rotor determines the throw of said pistons as the pistons orbit the rotor attendant operation of the device.

Abstract: An external combustion engine has at least two axially spaced banks of radially disposed cylinders formed in a rotating engine block. A reciprocating piston is mounted in each cylinder. The block is rotatably mounted in an external engine housing and rotates about a first axis. A drive shaft is rotatably mounted in the external housing along a second axis parallel to but displaced from the first axis. The drive shaft extends through the central portion of the engine block and has a polygonal cross section with as many faces as there are pistons in each bank. Each piston engages a respective face of the polygonal drive shaft so that as the drive shaft and the engine block rotate together, the relative eccentric motion therebetween causes the pistons in each bank to reciprocate within their respective cylinders. A first bank of pistons is dedicated to the intake and compression of air drawn in from an air intake port in the external housing.

Abstract: A fluid pressure device of the type having reciprocating pistons disposed in associated cylinders formed in an engine block that rotates conjointly with a drive shaft mounted eccentrically to the spin axis of the engine block. The length of the piston strokes is determined by the offset distance between the spin axis of the engine block and the spin axis of the drive shaft, said respective axes being parallel to one another. At least two axially spaced banks of radially disposed pistons and complementally formed cylinders are provided and base plate means serve to rigidly interconnect axially adjacent pistons of the respective banks. Axially spaced bridle rings retain the opposed ends of the base plates and serve to rigidly interconnect diametrically opposed pairs of pistons. Openings formed in a stationary cylindrical housing transiently align with the rotating cylinders to provide the valving means for the device.

Abstract: The invention relates to a hydraulic motor with two cylinder sets of different diameters and with a slide valve for directing a pressure medium simultaneously to both cylinder sets or to either one of them. In order to achieve smooth shifting from one driving state to another, the slide valve comprises means for connecting the pressure openings of the disconnected cylinder set to a space wherein return pressure prevails, whereby the pistons of the said cylinder set passively will follow the rolling space of the cam ring of the motor. The valve structure further comprises means for connecting the pressure openings of both cylinder sets with the said space of return pressure, if the work pressure of the motor approaches the return pressure.

Abstract: A hydraulic motor with two sets of cylinders, the diameters of the two cylinder sets being of different dimension in order to produce three speed ranges. The pressure medium is directed to either both cylinder sets, the cylinder set of larger diameter of the cylinder set of smaller diameter by means of a valve structure comprising sliding spindles arranged in the hollow center axle of the motor, the pressure force of the pressure medium being utilized for moving the valve spindles.

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: The invention relates to a positive control especially radial piston motors for hydrostatic motors. Such control, while permitting a large range of rotational speed, is capable of avoiding disturbances in the oil flow occurring during coverage of the edges of includes slide valves and provides optimum smoothness of operation of the hydrostatic drive. It is the object of each slide valve to control the connection between an associated working cylinder and the inflow and outflow of the pressure medium. It is a further object of the slide valve to establish connection between the associated working cylinder and a pressure equalizing conduit, at least during coverage of a first pair of control edges, i.e. in a phase during which the working cylinder is cut off both from the pressure medium intake and from the pressure medium outlet. For this purpose the slide valve is provided with a second pair of control edges.

Abstract: A hydrostatic transmission, especially for a steer drive of a propulsion and steer drive transmission, having a variable displacement pump, a fixed displacement motor, and a pump displacement control, and including a low pressure fluid source supplying the charging and lubrication systems of the hydrostatic transmission and a high pressure source. The high pressure source, in a normal range of low hydrostatic power pressure values, provides control pressure regulated in proportion to high hydrostatic power pressure to meet the pressure requirements of the pump displacement control which increase with high hydrostatic power pressure. In an abnormal and lower range of low hydrostatic pressure values, the control pressure is regulated to decrease to zero as the low hydrostatic power pressure decreases to a minimum operating pressure value.

Abstract: A throughput-adjustable fluid-displacement machine includes a stator and a rotor which is supported on the stator for rotation about an axis. The stator has two axially spaced circumferentially extending cam tracks and the rotor has two sets of passages therein, each of the passages having an open end which always faces a different one of the cam tracks for each of the sets of passages. A plurality of pistons is respectively accommodated in the above-mentioned passages, each of the pistons having a cam follower portion and being acted on by a spring which urges the cam follower portion into a constant contact with the respective cam track so that the piston reciprocates in dependence on the configuration of the respective cam track. Two control sleeves, one for each of the sets of passages, is interposed between and selectively communicates the working chambers of the respective passages with respective input and output conduits of the machine.

Abstract: A rotating assembly (22) is used, for example, as a crank assembly in an orbiting radial motor (14) to drive ring gears (16,17) or in a multiple output speed increaser or reducer. The use of more than one rotatable section connected to a first member (30), such as more than one throw on a crankshaft, can cause unequal load sharing between the sections. The rotating assembly (22) has a first member (30), a second annular member (32) positioned about the first member (30) and a third annular member (34) positioned about the second annular member (32). A first bearing element (48) positioned between the first and second members (30,32) supports the second member (32) in rotation relative to the first member. A second bearing element (56) positioned between the second and third members (32,34) supports the third member (34) in rotation relative to the second member (32).

Abstract: An apparatus for exchanging pressure energy between a fluid having a high energy content as a result of pressurization, and a fluid having a relatively lower pressure. The apparatus includes a rotor which has a plurality of spaced tubes extended in substantially parallel array over a major portion of the rotor length, and each having a separatory member movably mounted therein for reciprocatory displacement in the respective tube. Each of the fluid conveying tubes has its opposite ends movably but sealingly received in recesses in; floating rotor seal plates. Each seal plate further includes an arcuate port which completes the opening formed by both the recess and port through the seal plate. The opposite side of each seal plate from that which contains the recesses into which the respective tubes extend bears sealingly against a fixed stator block.

Abstract: A vehicle for traveling in the air and on the ground is equipped with two, four, or eight propellers on vertical shafts, each driven by a rotary hydraulic motor of the radial-piston type. The motor comprises two rotors which are connected in individual hydraulic circuits supplied with fluid from different hydraulic pumps. One embodiment of the vehicle comprises an automobile with the propellers mounted in oblique air ducts or in shrouds pivotable in the travel direction. Each rotor of the hydraulic motors is coupled to the shaft unidirectionally so that in case of failure, the shaft can be driven by the other rotor. Each hydraulic pump preferably produces four equal fluid flows and comprises two rotors on a common shaft, each rotor with two separate groups of cylinders, the eccentricity of at least one of the rotors being adjustable. Both the hydraulic motor and the pump have inlet and outlet connections on the radial periphery of the housing.