| 摘要 |
<p>PURPOSE:To provide quick braking motion by equipping No.1, No.2 valves to open and close a main and an aux. pressure chamber to the reserver side with a valve body which makes opening/closing motion while seating itself on or separating from a corresponding piston, and lessening a play until a liquid pressure is generated in the two pressure chambers. CONSTITUTION:Together with a main and an aux. piston 10, 9 having passages in communication with liquid refill chambers X, Y with an opening at the end face of a pressure chamber valve bodies 43, 26 of No.1, No.2 valves opening and closing in compliance with the motions of these main and aux. pistons 10, 9 use the periphery of the passage opening at the end face of each piston 10, 9 as valve seat, respectively. As facing the end face with minor gap interposed when the master cylinder is out of operation and the relation of return springs 18, 33 is in specified arrangement, this minor gap is secured by a pin 46 and a shaft member 28 with the corresponding piston return position specified. If therefore the main and aux. pistons 10, 9 move the minor gap when the master cylinder is in operation, the liquid passage in communication with the working liquid reserver is shut from the two pressure chambers B, A, so that pressure chamber is generated in both chambers B, A substantially at the same time.</p> |
