| 摘要 |
PROBLEM TO BE SOLVED: To suppress hydraulic hysteresis of a solenoid valve by holding a working liquid in a feedback chamber and rapidly applying a feedback force to a spool when a valve part changes a state from a first state. SOLUTION: The solenoid valve controls an output pressure of an output port 54 by the communication and cutoff of respective ports of an input port 52, the output port 54, a drain port 56, and a feedback port 58. The feedback chamber 80 which introduces a working oil from the feedback port 58 is provided, and the feedback chamber 80 is constituted so that the feedback port 58 and the feedback chamber 80 are cutoff when the output pressure of the output port 54 is the greatest, and an enclosed space is formed in the feedback chamber 80. When the output pressure of the output port 54 is the greatest, the working oil in the feedback chamber 80 is retained, and therefore, when the output pressure is lowered from the state and the feedback chamber 80 is communicated with the feedback port 58, the feedback force is rapidly applied to the spool 44. As a result, the hydraulic hysteresis is suppressed. COPYRIGHT: (C)2009,JPO&INPIT
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