Patent ID: 8333442
Filing Date: 2012-12-18
Classification: B60T

Abstract:
1. A brake system comprising: a master cylinder for generating brake fluid pressure based on braking operation of a driver; an electrical fluid pressure generator communicating with the master cylinder, and having a rear fluid chamber and a front fluid chamber generating brake fluid pressure by an electrically controllable actuator; and a plurality of wheel cylinders communicating with the rear fluid chamber and the front fluid chamber, respectively, and generating a braking force for braking wheels so that when the electrical fluid pressure generator fails, the wheel cylinders are operated by the brake fluid pressure generated by the master cylinder; the electrical fluid pressure generator including: a rear piston and a front piston which are advanced by the actuator to generate brake fluid pressure in the rear fluid chamber and the front fluid chamber, respectively; a rear inlet port and a rear outlet port which are formed in the rear fluid chamber and connected to the master cylinder and the wheel cylinder, respectively; a front inlet port and a front outlet port which are formed in the front fluid chamber and connected to the master cylinder and the wheel cylinder, respectively; a rear first cup seal arranged at a front end of the rear piston so as to face forward; a rear second cup seal arranged at a rear end of the rear piston so as to face forward; a front first cup seal arranged at a front end of the front piston so as to face forward; a front second cup seal arranged at a rear end of the front piston so as to face rearward; and a rear supply port formed adjacent to and in the rear of the rear inlet port, and a front supply port formed adjacent to and in the rear of the front inlet port, the rear and front supply ports being connected to a reservoir.