Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1981-12-22
1986-02-25
Jordan, Charles T.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60435, 60436, 60444, 91461, F16H 3946
Patent
active
045719411
ABSTRACT:
A hydraulic power system having a variable displacement hydraulic pump, a hydraulic motor driven by the hydraulic pump for actuating a load, with the pump and motor being connected to constitute a closed hydraulic circuit. A hydraulic servo controls the displacement volume of the pump, and a motor stop arrangement prevents, in its operative position, the motor from rotating. The system includes a control valve responsive to a main line pressure in the closed hydraulic circuit for controlling a hydraulic fluid supply to the hydraulic servo to prevent the main line pressure from substantially exceeding a predetermined level, and a control is responsive to the operation of the hydraulic servo for releasing the motor stop arrangement from the operative position when the hydraulic servo is operating.
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Aoyagi Yukio
Izumi Eiki
Tanaka Sotaro
Yamaguchi Takeshi
Hitachi Construction Machinery Co, Ltd.
Jordan Charles T.
Klein Richard
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