Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1992-03-31
1993-02-16
Look, Edward K.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60459, 91518, 91447, F16D 3102
Patent
active
051860007
ABSTRACT:
A hydraulic drive system for construction machines includes a hydraulic pump (1), a plurality of hydraulic actuators (2, 3) driven by a hydraulic fluid supplied from the hydraulic pump, a plurality of flow control valves (4, 5) for controlling flow rates of the hydraulic fluid supplied to the actuators, respectively, and a plurality of distribution compensating valves (6, 7) for controlling differential pressures across the flow control valves, respectively, the plurality of actuators including a first actuator (2) which undergoes a relatively large load pressure and a second actuator (3) which undergoes a smaller load pressure than that of the first actuator. Distribution controllers (22, 23) are provided to control the distribution compensating valve (7) associated with the second actuator (3) such that a differential pressure (Pz2-PL2) across the flow control valve (5) associated with the second actuator (3) becomes larger than a differential pressure (Pz1-PL1) across the flow control valve (4) associated with the first actuator (2), when the first and second actuators (2, 3) are driven simultaneously.
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Hirata Toichi
Kajita Yusuke
Sugiyama Genroku
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
Nguyen Hoang
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