Power plants – Pressure fluid source and motor – Having correlated or joint actuation of controller of input...
Patent
1989-07-12
1991-04-02
Look, Edward K.
Power plants
Pressure fluid source and motor
Having correlated or joint actuation of controller of input...
60444, 60468, 60494, 91446, F16H 3946
Patent
active
050037765
ABSTRACT:
A hydraulic drive system is equipped with an engine, a plurality of hydraulic pumps adapted to be driven by the engine and including a variable displacement hydraulic pump provided with a displacement varying mechanism, a hydraulic motor connected to the variable displacement pump, a hydraulic actuator for actuating the displacement varying mechanism of the variable displacement hydraulic pump, a working fluid feeding means for feeding the hydraulic actuator with a hydraulic fluid of a pressure according to the degree of control of an accelerator lever which is adapted to instruct a target revolution number of the engine, and a low-pressure circuit for allowing the hydraulic fluid to be discharged therethrough from the hydraulic actuator. The system is provided with a maximum pressure limiting means for guiding the hydraulic fluid of the hydraulic fluid feeding means to the low-pressure circuit depending on the degree of control of the accelerator lever, thereby limiting the maximum pressure of the hydraulic fluid and a means for selectively actuating the maximum pressure limiting means.
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Kanai Takashi
Ochiai Masami
Oshina Morio
Sonoda Mitsuo
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
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