Vehicle brake hydraulic pressure control apparatus

摘要

A vehicle brake hydraulic control apparatus includes a reservoir, a hydraulic pressure pump, an orifice, a damper and a one-way valve. The reservoir absorbs an excess brake hydraulic pressure of a wheel brake. The hydraulic pressure pump suctions brake fluid absorbed by the reservoir and returns the suctioned brake fluid to a master cylinder through a return line. The orifice is provided in the return line. The damper is connected to the return line between the orifice and the hydraulic pressure pump and damps discharge pressure pulsation of the hydraulic pressure pump. The one-way valve is provided in the return line between the damper and the orifice and prevents a hydraulic flow from an orifice side to a damper side.

主权项

1. A vehicle brake hydraulic control apparatus comprising:
a reservoir that absorbs an excess brake hydraulic pressure of a wheel brake; a hydraulic pressure pump that suctions brake fluid absorbed by the reservoir and that returns the suctioned brake fluid to a master cylinder through a return line; an orifice provided in the return line; a damper that is connected to the return line between the orifice and the hydraulic pressure pump and that damps discharge pressure pulsation of the hydraulic pressure pump; and a one-way valve that is provided in the return line between the damper and the orifice and that prevents a hydraulic flow from an orifice side to a damper side, wherein the damper includes
a suction port continuing to a hydraulic pump side of the return line, anda discharge port continuing to a master cylinder side of the return line, and the one-way valve is provided at the discharge port,a damper cylinder,a damper piston that partitions an inside of the damper cylinder into a spring chamber and a pressure receiving chamber,a damper spring that is housed in the spring chamber and that elastically presses the damper piston toward a pressure receiving chamber side, and a port member having
an auxiliary pressure receiving chamber that coaxially continues to the pressure receiving chamber, andthe discharge port that has a smaller diameter than the auxiliary pressure receiving chamber and that coaxially continues to the auxiliary pressure receiving chamber, and the one-way valve includesa valve seat formed in an outer end of the discharge port,a valve body that opens and closes the discharge port in cooperation with the valve seat, anda valve spring that biases the valve body toward a valve close direction.