| 摘要 |
PURPOSE:To avoid a defficiency of brake force in a stopped condition, by providing a valve gear which connects an air tank and a brake-operating device to each other. CONSTITUTION:When the vehicle is stopped and a stepping-in on a brake detal 72 is released while stepping in a clutch pedal 84, the pressure inside an input chamber 61 is lowered as the pressure on a pipe 6 side is released to the atmosphere through a brake valve 5, but the pressure inside an interrupting chamber 63 is maintained as it is, so that a force energizing a spool 59 rightwards is gradually increased, and eventually, the spool 59 comes to a position where it makes contact with a right bottom part of a hole 57 through a projection 68, thereby connecting the interrupting chamber 63 and a supplying chamber 64 to each other. Accordingly, the chamber 63 is supplied with compressed air directly from the air tank 3, and the pressure supplied to the brake-operating device is raised from a pressure proportional to the stepping-in force to the pressure in side the air tank 3, and the braking force is increased. |
