| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress kickback and prevent generation of surge pressure exceeding an allowable value in the hydraulic chamber of a power cylinder, regarding a power steering device. SOLUTION: A check valve 39 is incorporated into a hydraulic pressure introducing port 36 connecting an oil pump and a control valve. The check valve 39 is provided with a union seat 122, a ball 124 and a cap 120. When the side of the control valve 20 becomes high pressure, a ball 124 seats on the union seat 122 and an injection valve is opened. Injection valve opening pressure is very low because a means energizing the ball 124 toward the union seat 122 is not provided. Radial movements of the check valve 39 of the ball 124 are regulated by a cap 120. Therefore, the ball 124 quickly moves to the union seat 122 when the injection valve is opened. |
