Auxiliary hydraulic pump system

Details Auxiliary hydraulic pump system Auxiliary hydraulic pump system

1991-12-02

1993-04-13

Look, Edward K.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60430, 60452, 60486, 180133, 417214, 417216, F16D 3102

Patent

active

052011747

ABSTRACT:
An engine-driven pump supplies pressurized hydraulic fluid to vehicle brake and steering circuits. A ground driven variable displacement pump controlled by a control circuit is de-stroked when the engine-driven pump is operational. The variable displacement pump includes a movable piston which divides a bore into a pilot chamber and a pump chamber. An outlet line with a check valve communicates fluid one way from the pump chamber to the vehicle circuits. An inlet line with a check valve communicates fluid one way from a reservoir to the pump chamber. A ground-driven rotatable cam member reciprocates the piston. A spring urges the piston towards the cam member and towards a full stroke position. A pilot line which communicates fluid pressure from an outlet of the engine-driven pump to the pilot chamber. When the engine-driven pump is operational the pressure in the pilot line moves the piston away from the cam member, thus de-stroking the variable displacement pump. When the engine-driven pump stops, the pilot pressure drops, causing the variable displacement pump to go into stroke. A relief valve may be used to reduce the stroke of the variable displacement pump when its output pressure is too high.

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