Patent ID: 9604617
Date: 2017-03-28
CPC Classifications: B60T

Claim:
1. A hydraulic brake system comprising a master cylinder forming a braking hydraulic pressure according to an operation of a brake pedal, wheel brakes provided at a front wheel and a rear wheel, respectively, to provide a braking force by receiving the braking hydraulic pressure of the master cylinder, solenoid valves provided at an inlet side and an outlet side of each of the wheel brakes to control a flow of the braking hydraulic pressure, a low pressure accumulator temporarily storing oil discharged from the wheel brakes during a pressure reducing braking in which the solenoid valves operate, a pump configured to compress oil stored in the low pressure accumulator such that the oil is discharged toward the wheel brakes or the master cylinder according to a demand, and an orifice provided at an outlet side of the pump, wherein the orifice comprises: an outer case and an inner case provided to form a space between the outer case and the inner case while assembled to the outer case; a first oil passage passing from the outer case through the inner case; and a second oil passage formed on an outer circumferential surface of the inner case and provided in the space between the outer case and the inner case, and the first oil passage and the second oil passage have lengths different from each other.