Abstract:
A radial piston machine, such as a pump or a motor, has a housing in which a cylinder body is rotatable. The cylinder body has radial cylinder bores which accommodate reciprocable pistons. A shaft mounts the cylinder body for rotation and is formed with two axially spaced circumferential grooves between which it is also formed with a high-pressure control opening and with a diametrically opposite low-pressure control opening; these openings communicate intermittently with the inner ends of the cylinder bores. Sealing lands are formed on the shaft intermediate the grooves and the openings, and supporting lands are formed axially outwardly of the grooves. The supporting lands are formed with four part-circumferential recesses arranged in pairs, the recesses of each pair axially flanking one of the control openings, and the recesses of one pair being communicated with a space having a fluid pressure lower than that of the control opening which they flank and/or the recesses of the other pair being communicated with the circumferential grooves.
Abstract:
A fluid pump or motor of the type having a rotor with hollow radially directed spokes each extending into a separate one of a series of cylinders that ride against an eccentrically positioned circular race as the rotor turns is provided with resilient means for maintaining the cylinders adjacent the race and in proper orientation relative thereto. This avoids possible damage from a tilted cylinder while enabling the cylinders to shift radially as necessary to accommodate to thermal expansion changes within the mechanism.
Abstract:
A radial piston motor wherein the angle through which the cylinder block must rotate relative to the pintle to move a port which communicates with a cylinder for a piston in the inner or outer end position into register with one of the control chambers in the peripheral surface of the pintle depends on the friction coefficient between the shoes of pistons and the slide block. This insures that the forces which act on the shoes do not interfere with smooth starting of the cylinder block.
Abstract:
The invention relates to pistons, piston shoes and associated safety means in fluid handling devices including hydraulic or pneumatic pumps, motors and transmissions, wherein recesses for the reception of portions of the piston shoes are provided in a fluid handling body and the walls which are adjacent to the recesses serve to prevent the escape of piston shoes from the recesses, wherein convex and concave semispherical engagement surfaces are provided on the pistons and piston shoes and wherein piston stroke enlargement means and friction preventing means may be associated with the piston shoes and/or pistons or the fluid handling body.
Abstract:
A system is provided for regulating the level of output fluid of a pump, which system includes primary pumping means for pumping fluid from a supply source, recycle pumping means for pumping accumulated output fluid, means for combining the fluid output of the primary pumping means and recycle pumping means into a combined fluid output stream, means for accumulating combined fluid output stream, means for restricting said combined fluid output stream whereby pressure variations in the combined fluid output stream can be sensed, and fluid pressure responsive control means responsive to said pressure variations for regulating flow of the combined fluid output stream to the primary pumping means and to the means for accumulating combined fluid output stream. In addition, a system is provided for atomizing a liquid in a gas, such as oil in air, employing the above system for regulating the level of output fluid to a pump.
Abstract:
A fluid motor or fluid pump of the piston or vane type having a plurality of pistons or vanes, a mounting means for said pistons or vanes, a cam ring, a rear cover, a valve plate interposed between said rear cover and said mounting means and a valve mounted outside of said rear cover. A plurality of annular grooves having openings on an inner side surface of the rear cover are formed in said rear cover. Each groove has a port opening on outer side of the rear cover. The valve plate with passages is disposed between the mounting means and the rear cover for covering said annular grooves and for communicating passages formed in said mounting means with said annular grooves. Between the valve plate and the annular grooves, a plurality of rings or inner and outer rings can be mounted for sliding contact with said valve plate. By changing the connection of said annular grooves with a power source by means of said valve and/or by rotating said inner and outer rings the connection or disconnection of said grooves with said passages are selected.
Abstract:
A radial piston hydraulic pump or motor comprising a rotary cylinder block receiving a number of radial pistons whose outer ends are connected to bearing pads engaging the inner surface of an annular cam ring, the pads being rectangular in end view and located in an axial direction between inwardly facing shoulders of a surrounding casing, while the rotary cylinder block is free to move axially on a central supporting shaft and is located axially through the pistons and bearing pads.
Abstract:
Axially movable balancing pistons are provided in axial cylinders of the rotor of a radial piston machine, pressing against the inner ring of a ball bearing whose outer ring is fixed to the housing so that the rotor, the balancing pistons, and the inner ring rotate together. The axial cylinders are the end portions of axial balancing passages extending between the ends of the rotor, and having on the end remote from the balancing pistons, ports on a rotary control face of the rotor cooperating with the inlet and outlet ports on a stationary control face of the housing. The pressure of the balancing pistons is transmitted by the ball bearing, or other thrust bearing, to the housing so that the rotor is axially displaced toward the stationary control face, and the rotary control face is pressed with the desired force against the stationary control face.
Abstract:
A hydraulic control unit includes a plurality of radial pump units driven by a common drive means. Each of the pump units is provided with an individual control assembly in the form of a control lever for rotating a cam which adjusts the eccentricity of a guide ring coupled to the radial pistons of a pump unit. In this way, the direction and magnitude of flow from the pump is controlled, being fed to or from the pump through a pair of conduits. The conduits are connected to a valve which, in response to the direction of flow in the conduits, is shifted to direct fluid flow in one of two directions through a hydraulic work unit. The valve also serves to direct fluid received from the work unit to a common condenser.