| 摘要 |
A pair of feedback chambers is provided in a supply/discharge switching control valve, and the hydraulic pressure is introduced from a portion on the upstream side of the orifice provided in the communication passage through the second feedback passage, and is introduced from a portion on the downstream side of the orifice provided in the communication passage through the first feedback passage. Therefore, the responsiveness is enhanced, compared with the case where only the first feedback chamber is provided. Also, the overshoot and the undershoot of the fluid pressure, and the pressure fluctuation are effectively suppressed, compared with the case where only the second feedback chamber is provided. Also, by appropriately setting the pressure receiving area of the spool in the first feedback chamber and the pressure receiving area of the spool in the second feedback chamber, and the circulation cross sectional areas of the orifices, it is possible to easily tune the responsiveness, and the overshoot and the undershoot of the fluid pressure, the pressure fluctuation and the like, according to the performance required of the hydraulic pressure device.
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