Abstract: A multiple cavity reciprocating positive displacement pump (200) comprises a plurality of pump cavities (222), each pump cavity (222) including at least an inlet valve (228) and an outlet valve (231), wherein respective inlet valves (228) are in fluid communication with a common inlet (224) and respective outlet valves (231) are in fluid communication with a common outlet (238), and wherein the pump cavities (222) are arranged about a pump axis (AR) and around said common inlet (224) and said common outlet (238).

Abstract: A radial piston device includes a housing, a pintle attached to the housing and having a pintle shaft, a rotor rotatably mounted on the pintle shaft and having cylinders, pistons displaceably received in the cylinders, and a drive shaft coupled to the rotor and rotatably supported within the housing. The radial piston device includes mechanisms for reducing a pressure loss of hydraulic fluid flowing into the pintle shaft.

Abstract: The invention relates to a radial-piston hydraulic motor (10), having at least one cylinder groups (1) placed in a stationary position, which. cylinder groups contain piston mechanisms moving radially back and forth. A cam ring (12) is connected with a box frame (11) and the box frame with a distributor valve (13), which controls the pressurized fluid flow at the correct time into the cylinder spaces of the pistons that are at the power stage. The sense of rotation of the motor can be reversed by reversing the direction of flow of the fluid through the distributor valve (13). The fluid is passed to the distributor valve (13) through the sets of ducts in the shaft (14) which is placed in a stationary position together with the cylinder frame(s) (15) of at least one cylinder groups (1). The distributor (13) has a duct (31) which communicates with the power pressure and which is opened on the side face (13a) of the distributor (13).

Abstract: A radial piston pump with pistons which pump into a circumferential pressure passage has the passage sealed on its outer side by a plastic annular member of a trapezoid-shaped cross-section. The longer parallel side of the cross-section faces radially inwardly and includes a circumferential groove for receiving a resilient O-ring which biases closed pressure valves located between the pistons and the passage. The annular member is adapted to be inserted radially inwardly into the circumferential pressure passage by expanding it and allowing it to contract into the passage. A radially inner side of the circumferential passage is, at a location between two adjacent cylinders, connected to a passage that extends radially inwardly and that is connected to an axial passage that leads to a pressure connection.

Abstract: This power plant utilizes a multi-cylinder hydraulic engine that has a plurality of pistons and cylinders arranged for reciprocal movement. Each piston is powered by a hydraulic fluid or air pressure. The fluid exhausted from one cylinder is sent to another cylinder to act as the inlet fluid to move that cylinder. The engine requires piston and cylinder arrangements in sets or multiples of four (such as 4, 8, 12, 16 and so forth) to provide a balanced system. The engine can be designed in many different arrangements such as four cylinder in line, four cylinder radial, eight cylinder radial, eight cylinder V-shaped, eight cylinder opposed and so forth. These cylinder arrangements can be linked together if desired to provide multiple engine power plants. The piston used in the present invention is a spool-type piston having distinct sections which create distinct upper and lower fluid areas in the cylinder.

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: An external combustion engine wherein a plurality of radially disposed piston cylinders are arranged around the axis of an output drive shaft. Pistons are reciprocal in the cylinders and actuate rollers carried by radially extending slide bearings, the rollers engaging in an eccentric cam groove formed in a flywheel fixed to the drive shaft. The cylinders have closed inner and outer ends and are provided with valve means for applying pressurized gas to opposite ends of the pistons at different times in a manner to provide power to a majority of the pistons at all times during rotation of the drive shaft. The engine can alternatively operate as a pump by applying motive power to the shaft.

Abstract: In a fluid machine, wherein fluid flows through working chambers, as in pumps, compressors, motors, transmissions, a rotor and a drive shaft are revolvingly borne in the housing of the machine. Since slight departures of the axes of the rotor and shaft from each other might result in wearing of faces or in widened clearances in the machine, the shaft and rotor are coupled flexibly. The coupling is managed by providing the drive shaft with arms or fingers and the rotor with gaps whereby the gaps are extending into the axially seen medial rotor portion. The arms or fingers are engaging the walls of the gaps in the mentioned medial rotor portion, whereby tilting components of forces, which might occur, when the coupling would be on an axial end of the rotor, are prevented.

Abstract: This invention provides a power converting device capable of use as a pump and as a motor. The device includes a rotor shaped like a disc and secured to a shaft about which it rotates. Provided in the rotor are a plurality of piston chambers extending from the outer circumferential surface inwardly at an angle to a radiant from the axis. Each of the chambers opens through both side walls of the rotor, and each contains a piston. Each of the pistons is pivoted on either side to an arcuate drive segment adapted to move around an annular recessed channel within structure which defines a stationary enclosure for the rotor. There are two annular recessed channels, one on either side of the rotor, and the channels are aligned with each other and eccentrically located with respect to the axis of the rotor. With this arrangement, rotation of the rotor within the stationary enclosure is simultaneous with reciprocatory movement of the pistons in their respective piston chambers.