An integrated pressure plate and port plate, and method of forming same, for a pump includes a housing having a pumping chamber formed therein. The housing includes first and second metal pressure plate portions that form at least a portion of the pumping chamber wherein at least one of the first and second pressure plate portions has a hard coating formed of a different material than a remainder of the housing metal on a surface thereof where integrated ports are formed on surface(s) of the pressure plate portion(s). Surface irregularities relieve stresses and promote adhesion of the coating (e.g., tungsten carbide) to the underlying metal (aluminum alloy).

An integrated pressure plate and port plate, and method of forming same, for a pump includes a housing having a pumping chamber formed therein. The housing includes first and second metal pressure plate portions that form at least a portion of the pumping chamber wherein at least one of the first and second pressure plate portions has a hard coating formed of a different material than a remainder of the housing metal on a surface thereof where integrated ports are formed on surface(s) of the pressure plate portion(s). Surface irregularities relieve stresses and promote adhesion of the coating (e.g., tungsten carbide) to the underlying metal (aluminum alloy).

A vane cell machine is provided comprising a housing having a stator bore with an outer limitation formed by a circumferential wall and two axial end faces (5), a rotor mounted rotatably in said stator bore, a plurality of vanes moveable in radial direction relative to said rotor and sliding along said circumferential wall, and sealing means (12) at least at one of said end faces (5), said sealing means (12) acting on said rotor in axial direction. Such a vane cell machine should have a simple construction. To this end said end face (5) is formed at an end plate (11) of said housing wherein said end plate (11) comprises a recess in which said sealing means (12) are rotated.

A hydraulic pump or motor includes a mounting flange that is disposed at the first end of the housing. The mounting flange defines a pair of bolt receiving slots that are disposed along the X-axis on either side of the shaft. The pair of bolt receiving slots each define a radius center that are spaced away from each other a X dimension, and a pilot projection extends longitudinally away from the mounting flange, defining a pilot projection diameter. A ratio of the X dimension to the pilot projection diameter ranges from 1.1 to 1.5.

A seal tube assembly of a pump system is provided. The seal tube assembly includes a single seal tube having a first axial end sealably coupled to a first vane pump and a second axial end sealably coupled to a second vane pump. The single seal tube includes transverse contact surfaces at the first axial end and transverse contact surfaces at the second axial end. The single seal tube is formed to define a first seal tube cavity at the first axial end and a second seal tube cavity at the second axial end

A seal tube assembly of a pump system is provided. The seal tube assembly includes a single seal tube having a first axial end sealably coupled to a first vane pump and a second axial end sealably coupled to a second vane pump. The single seal tube includes transverse contact surfaces at the first axial end and transverse contact surfaces at the second axial end. The single seal tube is formed to define a first seal tube cavity at the first axial end and a second seal tube cavity at the second axial end

A hydraulic assembly includes a pump that is bi-rotationally driven by an output shaft of a transmission or transaxle and a hydraulic circuit that includes a pressure actuated control valve and a plurality of check valves. The check valves are arranged so that, regardless of the direction of rotation of the pump, the suction side of the pump is always in fluid communication with a sump and the pressure side of the pump is always in fluid communication with one of the inlet ports of the spool valve. In one direction of rotation of the pump, pressure in a line is supplied to a control port of a control valve to translate a control element to connect an outlet of the pump to the fluid system of the transmission or transaxle. In the other direction of rotation, no pressure is supplied to the control port and the control element, biased by a spring, connects the other outlet of the pump to the fluid system of the transmission.

A fluid transfer device comprising an inner member with a central axis and an outer surface; an outer member coaxially arranged with the inner member, and a space defined radially between the inner and outer members; a first and second axial members; at least one fluid chamber defined in the space having an inlet and an outlet; the first axial member is rotationally fixed relative to the outer member and the second axial member is rotatable about the central axis to vary the volume of the fluid chamber. The relative rotational position of the first and second axial members is defined by a cam arrangement which comprises first and second axial member walls; the first axial member wall forms a first cam track wall which provides a first cam track waveform, the second axial member wall which comprises a second cam track wall; each cam track wall is circumferentially continuous.

A fluid transfer device comprising an inner member with a central axis and an outer surface; an outer member coaxially arranged with the inner member, and a space defined radially between the inner and outer members; a first and second axial members; at least one fluid chamber defined in the space having an inlet and an outlet; the first axial member is rotationally fixed relative to the outer member and the second axial member is rotatable about the central axis to vary the volume of the fluid chamber. The relative rotational position of the first and second axial members is defined by a cam arrangement which comprises first and second axial member walls; the first axial member wall forms a first cam track wall which provides a first cam track waveform, the second axial member wall which comprises a second cam track wall; each cam track wall is circumferentially continuous.

A motor pump assembly is provided that comprises a motor, a drive shaft connected to the motor, a pump and control manifold including means for controlling fluid flow to and/or from the pump. The motor, drive shaft, pump and manifold are contained within a single common housing. The manifold forms an integral part of the housing and includes a pump chamber that contains the pump.