| 摘要 |
PURPOSE:To reduce consumption in a hydraulic fluid, by making a selector valve intercept a balancing chamber from a feeding chamber and simultaneously interconnecting it to an output chamber in time of brake commanding, while making the selector valve interconnect the balancing chamber to the feeding chamber and simultaneously intercepting it from the output chamber in time of brake releasing. CONSTITUTION:When control pressure AS goes up, a feeding chamber 1 is interconnected to an output chamber 2 and a balancing chamber 4 whereby output pressure goes up. And, when the control pressure goes down, the output chamber 2 is interconnected to an exhaust chamber 6 whereby the output pressure goes down. Thus, the output pressure proportioned to the control pressure AS in response to car load is securable. Here a selector valve 30 is excited in time of release commanding and selected to a first position 31, causing the feeding chamber 1 to be interconnected to the balancing chamber 4, while it intercepts the output chamber 2 and the balancing chamber 4 either. And, the selector valve is magnetized in time of brake commanding, and selected to a second position 32, intercepting the feeding chamber 1 and the balancing chamber 4, while it interconnects the output chamber 2 to the balancing chamber 4. |
