Anti-skid pressure control device in hydraulic braking system

摘要

An anti-skid pressure control device of a hydraulic braking system, comprising: a solenoid valve for selective communication of a master cylinder with a brake cylinder to apply a brake or with a reservoir to bleed the brake cylinder; a pump for returning a fluid from the reservoir to a passage between the master cylinder and the solenoid valve; a shut-off valve to prevent a fluid flow from the pump toward the master cylinder; and a relief valve for returning the fluid from the pump to the master cylinder. The relief valve includes: a housing having a valve chamber, a first port connected to the pump, and a second port communicating the valve chamber and the master cylinder; valve seat adjacent to the firstport; a valve member disposed in the valve chamber such that it may be seated on the valve seat; a piston slidably supported in the housing so as to force the valve member against the valve seat, the piston receiving at its one end a pressure in the valve chamber and at the other end an atmospheric pressure; and a spring for biasing the piston and the valve member toward the valve seat.