Title:
HIGH-EFFICIENCY, LARGE ANGLE, VARIABLE DISPLACEMENT HYDRAULIC PUMP/MOTOR
Document Type and Number:
WIPO Patent Application WO2004081380
Kind Code:
A3
Abstract:
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.
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Inventors:
GRAY CHARLES L JR
MOSKALIK ANDREW J
BRUSSTAR MATTHEW J
GILL DAVID K
FUQUA KEVEN BERENT
MOFFAT CRAIG DOUGLAS
MOSKALIK ANDREW J
BRUSSTAR MATTHEW J
GILL DAVID K
FUQUA KEVEN BERENT
MOFFAT CRAIG DOUGLAS
Application Number:
PCT/US2004/005661
Publication Date:
May 12, 2005
Filing Date:
February 26, 2004
Export Citation:
Assignee:
US ENVIRONMENT (US)
International Classes:
F04B1/12; F04B1/20; F04B1/32; (IPC1-7): F04B1/12; F01B3/00
Foreign References:
| US6203283B1 | 2001-03-20 | |||
| US3148628A | 1964-09-15 | |||
| US6279452B1 | 2001-08-28 | |||
| US4920860A | 1990-05-01 |
Other References:
See also references of EP 1599674A4
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