HYDRAULIC CONTROL DEVICE BY MUTUAL OPPOSITE CONNECTION OF OIL FLOW CONTROL VALVES

摘要

PROBLEM TO BE SOLVED: To reduce the degree to which controllability is lost by sticking of a servo valve when a hydraulic servo mechanism having a pair of opposed hydraulic pressure chambers is controlled by the four-port servo valve.

SOLUTION: Into or from the pair of opposed hydraulic pressure chambers of the hydraulic servo mechanism, oil is supplied or discharged via one of two oil flow control valves each of which has an oil supply control part for controlling the supply of oil from a pressure oil source and an oil discharge control part for controlling the conduction to an oil discharge passage. The operated condition of the hydraulic servo mechanism at one side is changed by one of the oil flow control valves and the operated condition of the hydraulic servo mechanism at the other side is changed by the other.

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