| 摘要 |
<p>PURPOSE:To improve a feeling of pedal operation, by cutting off an interconnection between a cylinder chamber and a fluid reservoir port separately each by a first valve element and a second valve element having a throttle passage, and making the interconnection by either of these valve elements performable at all times. CONSTITUTION:In a second piston member 4, there is provided with an inlet valve chest 27 which is interconnected to a second boosting chamber 15 via a hole 28, while it is also interconnected to a piston chamber 29. In this case, a first valve element 30 is installed in the said chamber 27, and it is seated on a first valve seat 32, cutting off the interconnection between the chest 27 and the chamber 29 aforesaid. On the other hand, in the said chamber 29, there is provided with a small piston as a second valve element, which is seated on a second valve seat 36, cutting off a slit groove 35 as a throttle passage interconnecting the said chest 27 and a reservoir interconnecting chamber 17 through. And, a connecting rod 39 of the first valve element 30 is engaged with an engaging hole 38 of the small piston 34, and a piston rod 40 of the small piston 34 is made contact with a stopper pin 23.</p> |
