Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1991-02-28
1992-12-08
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
91436, 91444, 91448, 91463, 13759613, F16D 3102
Patent
active
051687054
ABSTRACT:
A flow control valve has a first variable restrictor to control a flow rate of a hydraulic fluid supplied from a hydraulic fluid supply line to a hydraulic actuator and a second variable restrictor to control a flow rate of the hydraulic fluid discharged from the hydraulic actuator to a hydraulic fluid return line. A pressure compensating valve holds constant a differential pressure across the first variable restrictor, and a recovery circuit having a recovery line has a check valve that allows flow of the hydraulic fluid only toward the supply line. The recovery circuit receives at least part of the hydraulic fluid discharged from the hydraulic actuator and returns it to the supply line at a portion between the pressure compensating valve and the first variable restrictor through the recovery line upon controlling of the discharged flow rate by the second variable restrictor to thereby recover the discharged hydraulic fluid. A third variable restrictor disposed in the return line at a portion downstream of the second variable restrictor controls the recovery pressure of the hydraulic fluid returned to the supply line, and its restriction amount is changed dependent upon an input amount of the flow rate control valve.
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Hirata Toichi
Koiwai Hideshi
Nakamura Kazunori
Takahashi Yoneaki
Tanaka Hideaki
Hitachi Construction Machinery Co. Ltd.
Kayaba Industry Co. Ltd.
Look Edward K.
Mattingly Todd
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