Patent ID: 6688706
Filing Date: 2004-02-10
Classification: B60T

Abstract:
A hydraulic pressure control apparatus for a brake system including a master cylinder supplying fluid to wheel brake cylinders, the apparatus comprising:a control unit for controlling operation of the hydraulic pressure control apparatus; a pressurized fluid generating unit for pressurizing brake fluid and supplying the pressurized fluid; and a hydraulic pressure distributing unit for mechanically selecting and transmitting at least one of hydraulic pressure of the pressurized fluid supplied from the pressurized fluid generating unit and hydraulic pressure supplied from the master cylinder of the brake system to the wheel brake cylinders of the brake system, wherein the hydraulic pressure distributing unit comprises: a pressure chamber for receiving pressurized fluid from the pressurized fluid generating unit; a distributing chamber adjoining the pressure chamber, to which the master cylinder is connected by a first port and a brake cylinder is connected by a second port; and a spool disposed in the distributing chamber for transmitting hydraulic pressures of the pressure chamber and the master cylinder to the second port, wherein the spool is operated by pressure from the pressure chamber and an elastic force from a first elastic member abutted against an inside portion of the distributing chamber; and a first hole always communicating with the first port and a second hole selectively communicating with the second port are formed at the spool, where a check valve is disposed at the second hole such that the selective communication between the second hole and the second port is controlled by the check valve wherein the check valve comprises: a second spring abutted against an inside portion of the distributing chamber; a valve seat connected to the second spring for selectively opening the second hole; and a valve stem connected to the valve seat and penetrating the second hole.