Patent ID: 8850810
Filing Date: 2014-10-07
Classification: B60T,F15B,F16F

Abstract:
1. A vehicular braking-force generation device, comprising: a hydraulic pressure generation section for generating a hydraulic pressure corresponding to an operation amount of a brake operation member by a driver; and a reaction force generation section communicated with the hydraulic pressure generation section to generate, against the driver, a reaction force corresponding to the operation amount of the brake operation member, wherein the reaction force generation section includes a simulator piston that is operated to move in a forward direction or in a backward direction, corresponding to the hydraulic pressure generated by the hydraulic pressure generation section, the simulator piston being housed in a simulator housing, wherein the hydraulic pressure generation section includes: a first piston and a second piston provided to be forward and backward movable in a master cylinder, in association with the brake operation member; a first hydraulic chamber partitioned by an inner wall portion of the master cylinder, the first piston, and the second piston; and a second hydraulic chamber partitioned by the inner wall portion of the master cylinder and the second piston, the second hydraulic chamber being communicated with the reaction force generation section, wherein a maximum value of hydraulic pressure generated in the second hydraulic chamber is set smaller than a maximum value of hydraulic pressure generated in the first hydraulic chamber, and wherein, when the second piston reaches a bottom of the master cylinder by an operation of the driver, the simulator piston does not yet reach a bottom of the simulator housing.