| 摘要 |
PURPOSE:To obtain a small-sized hydraulic pressure feeding source by installing a boosting means between a hydraulic pressure feeding source hydraulic pressure control means and a brake device and setting the pressure receiving area set close to the input chamber of a boosting piston larger than the pressure receiving area set close to the output chamber. CONSTITUTION:Boosting means 4FL, 4FR, 4RL, and 4RR are interposed between a hydraulic pressure feeding source hydraulic pressure control means 3 and brake devices BFL, BFR, BRL, and BRR, and a boosting piston 65 is fitted in slidable manners into a boosting cylinder body 66, setting the both edges close to an input chamber 63 and an output chamber 64, and a spring 67 is accommodation-arranged in the output chamber 64, and the pressure receiving area S1 set close to the input chamber 63 of the piston 65 is set larger than the pressure receiving area S2 set close to the output chamber 64. Therefore, the hydraulic pressure supplied from the control means 3 is supplied into the input chamber 63, and the hydraulic pressure in the output chamber 64 increases over the hydraulic pressure in the input chamber 63, and the boosted brake hydraulic pressure is supplied into the brake devices BFL, BFR, BRL, and BRR. Therefore, even if the output hydraulic pressure of the hydraulic pressure feeding source 2 is set relatively low, a sufficient brake pressure can be obtained in each brake device, and the load of the hydraulic pressure feeding source 2 can be lightened. |
