Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1994-11-07
1995-10-24
Look, Edward K.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60452, 60494, 91518, 91446, F16D 3102, F15B 1108
Patent
active
054600014
ABSTRACT:
A flow control system is arranged in a hydraulic circuit provided with a variable displacement hydraulic pump, plural actuators and a pump controller. The pump controller controls the displacement of the pump so that a delivery pressure becomes higher by a predetermined value than a maximum load pressure of the plural actuators, whereby the flow rate of pressure oil to the actuators is controlled. The system includes plural valve units connected between the pump and the actuators. Each valve unit has an operating and correcting variable restrictors. The system also includes pressure compensation valves, which are each arranged on an upstream side of a restrictor group consisting of the operating and correcting variable restrictors. The opening of the pressure compensation valve is independently set by an opening drive force set based on a downstream pressure of the restrictor group, an opening drive force set by a pressure-difference setting device and a closing drive force set based on an upstream pressure of the restrictor group so that the upstream pressure becomes higher by a predetermined pressure than the downstream pressure of the restrictor group.
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patent: 5101629 (1992-04-01), Sugiyama et al.
patent: 5271227 (1993-12-01), Akiyama et al.
patent: 5347811 (1994-09-01), Hasegawa et al.
Kato Hideyo
Ochiai Masami
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
Nguyen Hoang
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