The United States of America As Represented by the Administrator of the U.S. Environmental Protection Agency

U.S. Environmental Protection Agency

David K Gill

Charles L Gray, Jr

Matthew J Brusstar

Andrew James Moskalik

Craig Douglas Moffat

Kevin Berent Fuqua

Keven Berent Fuqua

Andrew J Moskalik

A variable displacement hydraulic/pump motor has a yoke with a pair of shafts aligned to define a yoke pivot axis and connected to a valve plate therebetween having intake and discharge apertures. A rotatable cylinder barrel has piston cylinders open at one end to receive a piston head and opening through fluid ports at another end, flush against the valve plate surface. A drive block is mounted on an input/output shaft for rotation about a central axis of rotation inclined at an angle relative to the longitudinal axis of the cylinder barrel which may be changed by a drive engaging the yoke at a point near its pivot axis. Loads on bushings supporting the yoke shafts are reduced by providing radially extending fluid ports in the shafts and in communication with the intake and discharge apertures of the valve plate.

High-efficiency, large angle, variable displacement hydraulic pump/motor

Growing community of inventors

Bellevue, MI, United States of America

David K Gill