Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1988-05-09
1989-09-26
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60493, F16H 3946, F04B 4902
Patent
active
048690651
ABSTRACT:
Reversible hydraulic motors drdiven by fluid from variable displacement pumps are useful in driving various mechanisms of earthmoving machines. It is desirable to control both the speed and direction of the motor with a single lever. The subject hydraulic control system includes a selector valve which has a fluid control section for directing pilot fluid to a reversing valve to reverse the direction of the motor. A signal control valve is mechanically actuated by movement of the selector valve to the operating position so that a regulated pressure control signal is directed to a displacement control of variable displacement pump to regulate the volumetric output of the pump and thus the operating speed of the motor.
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Caterpillar Inc.
Garrett Robert E.
Grant John W.
Kapsalas George
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