IMPROVEMENTS IN HYDRAULIC ANTI-SKID BRAKING SYSTEMS FOR VEHICLES

摘要

In an anti-skid braking system a modulator for modulating the supply of hydraulic fluid from a master cylinder to a brake incorporates a flow-control regulator valve and an exhaust valve which is responsive to signals from a sensor. When the exhaust valve is closed the regulator valve is in a first position to permit unrestricted direct flow through it and when the exhaust valve is open a variable orifice in the regulator valve provides a restricted flow through it. The exhaust valve and the valve are only connected hydraulically and a conventional inlet valve normally operated directly by the sensor is omitted. The construction is therefore simplified since relative position tolerances are otherwise eliminated.