Patent ID: 8342617
Filing Date: 2013-01-01
Classification: B60T

Abstract:
1. A hydraulic brake system comprising: an intake passage connecting a master cylinder to an intake side of a fluid pump; a discharge passage connecting a discharge side of the fluid pump to the master cylinder; a first passage branched from the discharge passage and connected to a wheel cylinder; a pressure reduction passage connected to a reservoir that reserves a pressure reduced brake fluid from the wheel cylinder; an outlet passage connecting the reservoir to the intake passage; and a gate-in valve that selectively opens and closes the intake passage in accordance with both a master cylinder pressure produced by the master cylinder and a pump intake side pressure produced in an intake side of the fluid pump; wherein the gate-in valve selectively opens and closes the intake passage in accordance with a pressure difference between the master cylinder pressure and the pump intake side pressure; wherein, when the master cylinder pressure is higher than a first given pressure and lower than a second given pressure, the gate-in valve takes a closed position when the pump intake side pressure is higher than a third given pressure but takes an open position when the pump intake side pressure is lower than the third given pressure; wherein the gate-in valve comprises: wherein the following inequality is satisfied by the brake system: