| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a valve mechanism reducing possibility of damage in an annular protrusion part formed of an elastic material. SOLUTION: When a valve unit 21 is seated in a valve seat 22, according to movement of a piston 6 by a return spring 18, a sleeve 23 is press energized by a pin 15, and by moving the sleeve 23 in a communication hole 6b, communication between the communication hole 6b and a brake fluid supply chamber 13 and communication between the communication hole 6b and a communication path 21ba are interrupted, to disconnect communication between the communication hole 6b and a second pressure chamber 8 and the brake fluid supply chamber. In addition, moving of the sleeve 23 increased a brake hydraulic pressure in the communication hole 6b.</p> |
