JPS5650836A - Antiskid actuator - Google Patents

Abstract

PURPOSE: To obtain constantly favorable antiskid control in such a way that when brake fluid has high viscosity in low temperature, ingression and egression of air in a pressure changing chamber is accelerated and a power piston is speeded up, whereas at the reverse time, a temperature sensitive valve is closed so as to speed down the movement.

CONSTITUTION: When braking in a constant temperature, master cylinder pressure is supplied through an input port 4, a check ball 5, a decompression chamber 26 and an output port 7 to a wheel cylinder. Then, when antiskid signals are given, an electromagnetic valve 8 works, a valve body 23 is closed, conduction between a pressure changing chamber 11 and a constant pressure chamber 12 in which there is constantly negative pressure is interrupted, while at the same time atmospheric air is flowed through the clearance between a valve seat 22 and the valve body 23, a passage 13 into the pressure changing chamber 11. In consequence, a power piston 10 moves to the right by differential pressure, and the ball 5 is seated on the valve seat. In this occation, the valve body 23 is provided so as to be actuated by a bimetal 24 so that opening area of a conduit 15 can be made larger than that at a constant temperature time in order to assure antiskid control in low temperatures.

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