F - Mech Eng,Light,Heat,Weapons – 01 – B
Patent
F - Mech Eng,Light,Heat,Weapons
01
B
103/13
F01B 13/04 (2006.01) F04B 1/32 (2006.01) F04B 49/10 (2006.01)
Patent
CA 1164725
DISPLACEMENT CONTROL FOR A HYDRAULIC PUMP OR MOTOR WITH FAILURE OVERRIDE 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.
386412
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
LandOfFree
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