Power plants – Pressure fluid source and motor – Pump means moves motive fluid from one chamber to an...
Patent
1989-04-28
1992-09-08
Denion, Thomas E.
Power plants
Pressure fluid source and motor
Pump means moves motive fluid from one chamber to an...
92142, F16D 3102
Patent
active
051448017
ABSTRACT:
An electro-hydraulic actuator having an electric motor disposed in a hydraulic fluid reservoir and connected to drive a hydraulic fluid pump. The actuator includes a piston rod which extends or retracts as a piston is hydraulically driven in a cylinder. An actuator housing forms the reservoir and cylinder and contains hydraulic passages connecting the pump, reservoir and cylinder. The actuator includes a one-way filter for filtering the hydraulic fluid. The hydraulic pump is preferably a rotating piston type and includes a port plate which allows the pump to drive the piston while the retract and extend chambers of the pump have different or unbalanced fluid drive ratios. A load limiting valve protects the system from excessive hydraulic pressure and a position sensor detects the position of the piston rod.
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Kenyon Richard L.
Nolan Michael E.
Scanderbeg Dino
Wilkerson William D.
Denion Thomas E.
Morgan Christopher H.
Nguyen Hoang
Parker Hannifin Corporation
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