Displacement control for a hydraulic pump or motor with failure

Details Displacement control for a hydraulic pump or motor with failure Displacement control for a hydraulic pump or motor with failure

1980-11-21

1983-05-03

Look, Edward K.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Cylinders parallel to rotation axis

60403, 60443, 417217, 417222, F01B 1304, F04B 122

Patent

active

043817025

ABSTRACT:
A displacement control for a pump or motor having a swash plate for setting displacement includes a control device operatively connected to the swash plate and a control valve having connections to a source of pressure and drain for operating said control cylinder. The control valve has a neutral position wherein the swash plate is at or near a minimum displacement position. The control valve is operable to other positions for setting the displacement of the pump or motor and, additionally, is movable to a control position other than the neutral position or normal displacement-setting positions in response to an operative failure of the control valve positioning system which enables the swash plate to move to a position which minimizes any adverse effects from the occurrence of said operative failure. In a pump, the swash plate moves to a zero displacement position upon the occurrence of a failure while, in a motor, the swash plate moves to a maximum displacement position.

REFERENCES:
patent: 3510231 (1970-05-01), Bobst
patent: 3633464 (1972-01-01), Aoyama
patent: 3881317 (1975-05-01), Swoager
patent: 3946560 (1976-03-01), MacIntosh et al.
patent: 4227443 (1980-10-01), Toot

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