Abstract: A fluid pump or motor is disclosed having a housing with a central opening in one side thereof and containing fluid inlet and outlet ports in which one portion of the housing includes a slipper bearing formed in the end opposite the central opening where the axes of the slipper bearing and central opening are in eccentric alignment with a shaft rotatably supported within the central opening of the housing where piston means for operating in a cylinder has the end nearest the center of the shaft with a segment of circular cross-section slot formed therein, the axis of which is parallel to the axis of the shaft with a slipper of substantially circular cross-section nested in the slot of each piston with the slipper extending beyond the walls of each piston in reduced radial configuration and working with a rotor having a plurality of radially arranged cylinders, each cylinder having a port at the outer end thereof and having the walls of each cylinder nearest the center of the rotor containing a dome shaped voi

Abstract: In a fluid motor or pump, a combinaton is disclosed having an internal ring gear operably secured within a housing meshing with a pinion gear and having a wedge with a shape conforming to the outer peripheries of the ring and pinion gears to provide a sealing effect and pressure or suction chamber where the wedge has a piston end and porting in the tip thereof to create a hydrostatic pressure in an operable direction to overcome pressure from the chamber and means for supporting the pinion gearing and carrying the wedge in slidable relatonship where the mechanism receives fluid under pressure from a source to the pressure chamber and includes means for returning fluid to the source.