| 摘要 |
PURPOSE:To obtain a sufficient brake pressure by installing an auxiliary hydraulic pressure generating means, accumulator in which the accumulator chamber communicating to the hydraulic pressure chamber and a back pressure chamber are connected to a hydraulic pressure feeding source, opening/closing valve interposed between the accumulator and a brake device and a unidirectional hydraulic pressure transmission means. CONSTITUTION:When a high hydraulic pressure can not be obtained from a hydraulic pressure feeding source 2, opening/closing valves 911 and 912 are opened according to the lowering of the hydraulic pressure in an oil passage 71 communicating to a hydraulic pressure feeding source hydraulic pressure control means 3, and the brake hydraulic pressure generated by an auxiliary hydraulic pressure generating means 6 directly acts onto the brake devices BFL-BRR, and a brake power can be secured. Since unidirectional hydraulic pressure transmission means 4FL-4RR are interposed between the brake devices BFL-BRR and the control means 3, the release of the brake pressure of the brake devices BFL-BRR to the hydraulic pressure control means 3 side is prevented. Further, when brake is not applied, the hydraulic pressure generated by the hydraulic pressure generating means 6 is stored into the accumulator chambers 103 and 104 of an accumulator 102, and the stroke of a brake pedal 1 is secured. |
