Abstract: Displacement control device for variably adjusting the displacement of an axial piston hydraulic pump including a rotary shaft rotatable around a shaft axis. A torque can be applied for rotating the rotary shaft to open and close servo pressure lines to adjust the displacement volume of the axial piston hydraulic pump. Concentric to the shaft axis in a mid-portion of the rotary shaft a detent sleeve is positioned having an abutment area onto which, in the neutral position, a sliding element abuts. The detent sleeve, in operating conditions is rotatably fixed with the rotary shaft and turns with the rotary shaft and for neutral position adjustments in non-operating conditions, the detent sleeve and the rotary shaft are detachable from each other such that the rotary shaft can be turned relative and independently within the detent sleeve, which is held in its neutral position by the sliding element.

Abstract: In general, certain embodiments of the present disclosure provide an electro-hydrostatic actuator comprising a piston assembly and a hydraulic cylinder. The piston assembly, having a piston head and a piston rod extending from the piston head, is located and movable within the hydraulic cylinder. The hydraulic cylinder includes a hydraulic fluid chamber region including a piston side chamber and a rod side chamber, a reservoir for storing hydraulic fluid located within the hydraulic cylinder which is in fluid communication with the hydraulic fluid chamber region. The electro-hydrostatic actuator includes a hydraulic pump system for moving hydraulic fluid in the reservoir and the hydraulic fluid chamber region, the hydraulic pump system in fluid communication with a flow control network in a hydraulic cylinder boss for controlling a direction and flow magnitude of hydraulic fluid within the hydraulic fluid chamber region, and an electric motor for driving the hydraulic pump system.

Abstract: According to one embodiment, a radial fluid device comprises a cylinder block, a first plurality of pistons, a second plurality of pistons, a first cam, a second cam, and a cam rotation device. Each of the first plurality of pistons are slidably received within a different one of a first plurality of radially extending cylinders. Each of the second plurality of pistons are slidably received within a different one of a second plurality of radially extending cylinders. The first cam is disposed about the first plurality of radially extending cylinders. The second cam is disposed about the second plurality of radially extending cylinders. The cam rotation device is coupled to the first cam and the second cam. The cam rotation device is operable to rotate the first cam in a first direction and the second cam in a second direction.

Abstract: According to one embodiment, a radial fluid device comprises a cylinder block, a first plurality of pistons, a second plurality of pistons, a first cam, a second cam, and a coupling device. Each of the first plurality of pistons are slidably received within a different one of a first plurality of radially extending cylinders. Each of the second plurality of pistons are slidably received within a different one of a second plurality of radially extending cylinders. The first cam is disposed about the first plurality of radially extending cylinders. The second cam is disposed about the second plurality of radially extending cylinders. The coupling device is operable to couple the cylinder block to a cylinder block of a second radial fluid device.

Abstract: According to one embodiment, a radial fluid device comprises a cylinder block, a first plurality of pistons including a first piston, and a second plurality of pistons including a second piston. Each of the first plurality of pistons are slidably received within a different one of a first plurality of radially extending cylinders. Each of the second plurality of pistons are slidably received within a different one of a second plurality of radially extending cylinders. The second piston is configurable to begin its stroke at a different time relative to the first piston within the first cylinder pair.

Abstract: A pump is disclosed. The pump may have a housing, a body rotatably disposed within the housing and at least partially defining a plurality of barrels, a plurality of plungers associated with the plurality of barrels, and a swashplate tiltable by a swivel torque to vary a displacement of the plurality of plungers relative to the plurality of barrels. The pump may also have a port plate with an inlet port, a discharge port, and a protrusion. The port plate may be configured to engage an end of the rotatable body. The pump may further have at least one piston disposed within the housing and configured to selectively engage the protrusion of the port plate to rotate the port plate and adjust the swivel torque.

Abstract: A capacity control valve capable of enhancing the function of discharging liquid refrigerant in a control chamber during startup of a variable capacity compressor, and improving the control speed of a swash plate during control is provided. The valve has an adapter that has an annular bearing surface and is provided to a free end of a pressure-sensitive body in the elongation and constriction direction, and a valve body for discharging liquid refrigerant, moveably provided inside the adapter. A slit is provided to an engaging part of the adapter with a third valve part, and an introduction hole for causing the control chamber pressure to act on a bottom surface of the valve body for discharging the liquid refrigerant is provided to the base part side, and an urging force is provided whereby the valve body for discharging the liquid refrigerant is urged in a valve-opening direction away from the third valve part.

Abstract: A control valve for a variable displacement compressor, in which the discharge pressure of the compressor introduced into a pressure sensing section applies urging force to a movement member, and a solenoid section applies, in cooperation with the urging force, urging force to the movement member depending on an input signal. The degree of opening of a valve body provided at the movement member is set according to the position of the movement member to regulate the rate of air flow in a communication path for interconnecting a discharge pressure region of the compressor and a compressor inner chamber. The suction pressure of the compressor is introduced into a control valve to apply urging force to the movement member, and communication between fluid having the discharge pressure introduced into the pressure sensing section and fluid having the suction pressure introduced into the control valve is shut off.

Abstract: Rotary piston and barrel machine comprising a thrust plate inclined in relation to its geometrical spin axis which coicides with the geometrical axis of the barrel, the central part of the inclined plate comprising a spherical bearing which revolves freely around a fixed central toggle type joint anchored to the central part of the barrel, whereas the barrel is connected to a rigid peripheral housing, the central toggle type joint being integral with a rigid half shaft connected to the rear part of the housing, characterized by at least one rod connected rigidly to the toggle type joint, as well as to a piston disposed inside a bore of the barrel and subjected to the action of an under-pressure fluid so that at least one part of the axial stresses applied to the toggle type joint is transmitted to the barrel without being applied to the housing.

Abstract: An air motor for small manually powered recreational boats. The overall system includes a manually powered pump which supplys pressurized air to accumulator tanks through check valves, a throttle to pass selected quantities of pressurized air from the tanks to an air motor, and the motor which converts the air pressure to rotational motion which drives an underwater propellor to move the boat. The air motor includes at least two sets of valves and power piston assemblies. A control cam and a power cam are mounted on a rotatable crankshaft which also drives the propellor. The control cam actuates the valves to direct air therefrom in a properly timed sequence. The power piston rods press on the power cam (functioning as a lever arm) to cause rotation of the crankshaft. This air motor assembly is compact, lightweight, smooth running and energy efficient.

Abstract: A fluid pressure translating device comprising a housing with a pumping mechanism therein including a rotary cylinder barrel having a plurality of cylinders with pistons slidable therein operatively associated with a cam block, each cylinder having a port opening to a valving base of the cylinder barrel, an inlet passage and outlet passage and a valve plate associated with the cylinder barrel and provided with inlet and outlet ports respectively in communication with the inlet and outlet passages. The cam block is rotatable to vary the circumferential position of the cam block relative to the valve plate thereby varying the displacement of the pumping mechanism.

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: Hydrostatic unit is disclosed of the kind having axial pistons and a variable stroke volume, in which a distributor body is rotatable about an axis inclined relative to the axis of a driving shaft and rotatably carries a cylinder block so that the axis of rotation of the cylinder block passes through the point of intersection of the axes of the distributor body and the driving shaft, the improvement consisting in that a phase-adjusting plate is inserted between the cylinder block and the distributor body and has ports equal to the distribution ports of the distributor body, it being possible to rotate the plate about the axis of the cylinder block so as to allow for the shifts of the dead centers of the pumping pistons relative to the distribution ports of the distributor body.

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 variable delivery hydraulic equipment is designed to be operated as a pump or a motor and includes a cylinder block having a plurality of cylinder bores on the same circumference thereof and a plurality of plunger assemblies each disposed within the cylinder bore. The plunger assembly has a pair of plungers oppositely disposed within the cylinder bore so as to define a chamber therebetween and slidably movable within the cylinder bore. A pair of cams are disposed in contact with opposite plungers with the cylinder block disposed therebetween. The cams each have a cam surface for imparting a plurality of reciprocatory movements in one cycle to the opposite plunger in a manner that the moving velocities of the opposite plungers are different from each other in all phase position. The cam surfaces are formed to have sine curves each having two crests and a different stroke. In consequence, the volume of the chamber between the opposite plungers is always varied.

Abstract: A variable delivery hydraulic equipment is designed to be operated as a pump or a motor and includes a cylinder block having a plurality of cylinder bores on the same circumference thereof and a plurality of plunger assemblies each disposed within the cylinder bore. The plunger assembly has a pair of plungers oppositely disposed within the cylinder bore so as to define a chamber therebetween and slidably movable within the cylinder bore. A pair of cams are disposed in contact with opposite plungers with the cylinder block disposed therebetween. The cams each have a cam surface for imparting a plurality of reciprocatory movements in one cycle to the opposite plunger in a manner that the moving velocities of the opposite plungers are different from each other in all phase position. The cam surfaces are formed to have sine curves each having two crests and a different stroke. In consequence, the volume of the chamber between the opposite plungers is always varied.