| 摘要 |
<p>PURPOSE:To expedite pedal operations in such a way that throttling area of the path which is formed by a moving valve member of a differential valve installed on the between a reservoir and a supply chamber and an opening port of a spring seat is changed along the moving direction of the moving valve member. CONSTITUTION:A liquid outlet port 2b of a reservoir tank 2 is inserted to a working liquid inlet port 28 which is formed on the cylinder body 1, and communicated to a supply chamber 10. A valve device 31 is installed in the inlet port 28, and the valve device 31 is assembled by a differential valve 32 and a check valve 33 for the supply chamber. A tapered diameter expanding part 36c is formed at the upper end part of a moving valve member 36, and the expanding diameter part 36c is protruded upward through the opening port 38a of a spring seat 38 of a spring 37. A counter-tapered part 36d, and a small diametral part 36e and formed at the lower side as shown in the figure of the diameter expanding part 36c, and a variable throttle 50 is integrated by means of these parts 36c, 36d, 36e, and the opening port 38a. Throttled area of the variable throttle 50 is set larger in the valve opening position than the valve closing position of the differential valve 32, and its throttle effect is set smaller than a groove 36b of the moving valve member 36.</p> |
