| 摘要 |
PURPOSE:To reduce a degree of valve opening resistance due to input hydraulic pressure, by staggering the valve opening timing of plural inlet valves interposingly installed in an oil passage lying between input and output hydraulic chambers. CONSTITUTION:When a brake pedal is operated, a valve piston 35 and an interlocking ring 48 are pushingly moved forward via an input rod 36, and from relations of L3<L1 and L1<L2, first an annular groove 39 is intercepted from an outlet port 38 whereby an outlet valve 27 is closed. Next, the interlocking ring 48 comes into contact with a rear end of an operating rod 321 of a first inlet valve 261, pushing this forward, whereby a ball valve body 301 is separated from its valve seat. Afterward, the interlocking ring 48 comes into contact with a rear end of an operating rod 322, pushing this forward, whereby a ball valve body 302 is separated from its valve seat. Thus, these first and second inlet valves 261 and 262 are opened in order. |
