| 摘要 |
PURPOSE:To reduce operating noise in the pressure passage of a booster, and improve responsiveness. CONSTITUTION:The first coil spring 9 which forces a valve 10 toward valve seats 7, 8 is arranged between a valve body 2 and the valve 10. Then, the second coil spring 23 which forcibly-supports an input shaft 12 consisting of a valve plunger 6 and an operating rod 11 at a non-operating position is arranged between the outer periphery part of a retainer 22 which is installed at the input shaft 12 and extends outwards in a radial direction and the valve body 2. Moreover, a through hole 22a which constitutes a part of a pressure passage 17 is formed at an inner position than the second coil spring 23 of the retainer 22. The second coil shrine may be positioned between the inner periphery part of the retainer which is installed at the valve body and extends inwards in a radial direction and the input shaft. It is thus possible to reduce the resistance of the pressure passage 17. |
