Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1989-08-31
1991-06-25
Kwon, John T.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60450, 60466, 60468, F16D 5706
Patent
active
050256262
ABSTRACT:
Cushioned swing circuits sometimes have a restricted passage between the motor conduits to allow the implement controlled by the swing circuit to coast to a stop. However, opening and closing of the restricted passage was manually controlled, thereby requiring an additional manipulative step by the operator. The present cushioned swing circuit includes a cushion valve moveable to an open position to establish communication through vent line means when a pressure differential greater than a predetermined level is generated in one of the motor conduits connecting a directional control valve to a hydraulic motor. The cushion valve is retained in the open position for a predetermined limited time after the pressure differential drops below the predetermined level so that the inertia generated pressure in the circuit is dissipated through the vent line means. At the end of the predetermined limited time, the cushion valve is moved to the closed position blocking communication through the vent line means whereupon the circuit is hydraulically locked. The cushion valve is moved between the opened and closed positions automatically and requires no additional effort by the operator.
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Crosser Jeffery A.
Mooberry Randall L.
Rinaldo James D.
Salazar-Vior Jose M.
Caterpillar Inc.
Grant John W.
Kwon John T.
Ryznic John
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