| 摘要 |
PURPOSE:To appropriately control the proportional control starting pressure in response to the loading of a vehicle by providing an inclinable traveling member which gives two stepped preliminary load between two-system fluid pressure control valves equipped with a deceleration responding valve on one of them. CONSTITUTION:The fluid pressure control valve of one system is formed by a piston 8' and a valve 19', while the same of the other system is formed by a piston 8, a control piston 10 and a valve 19. The control piston 10 projects rightward in response to the liquid quantity in a control chamber 15 controlled by means of a deceleration responding valve 41, thereby causing a traveling member 26 to slant and receive the load of the second preliminary load spring 37 in addition to the load of a preliminary load spring 35. When the loading of the vehicle becomes larger, the preliminary load is also increased in two steps, and proportional control can be performed more accurately. |
