| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the operation feeling of a brake pedal by reducing a variation of a repulsion force generated by a variation of hydraulic pressure at regeneration cooperation, in a booster and a brake device. <P>SOLUTION: An input rod 135 is operated by the brake pedal, air is introduced into a pressure change chamber 108 by a control valve 132, a power piston 106 is propelled, a primary piston 160 is advanced, and brake hydraulic pressure is generated by a master cylinder 110. A portion of the repulsion force generated by the hydraulic pressure is transmitted to the input rod 135 via a reaction disc 155. A loose stroke S which does not generate the hydraulic pressure is arranged in the primary piston 160, and the repulsion force transmitted to a plunger 131 is limited by a repulsion force adjusting spring 157. In a region of the loose stroke S, regeneration cooperation control is performed by supplying the hydraulic pressure to a wheel cylinder by a hydraulic pressure control device, and the repulsion force generated by the repulsion spring 159 is imparted to the input rod 133. By this arrangement, the variation of the hydraulic pressure of the master cylinder 110 caused by the operation of the hydraulic pressure control device is not transmitted to the input rod 135. <P>COPYRIGHT: (C)2012,JPO&INPIT |
