JPS5476774A - Antiskid controller - Google Patents

Abstract

PURPOSE: To prevent the lowering of response ability due to the defects of a power source, by opening a valve at the master cylinder side after perfectly cutting the pressure reduction means side when communicating a by-path valve mechanism in a safety device with a by-path circuit owing to the defects, etc. of the power source.

CONSTITUTION: If a pump 10 is broken when brake works, a cut valve 20 left moves by a valve spring and master pressure, a ball 23 of the cut valve is seated on a seat and communication between a communicating passage 49 and a master cylinder 13 is interrupted. When the pump is defective, however, pressure simultaneously disappears even in a hydraulic pressure chamber 41 at the by-path circuit means 40 side, a piston 42 left moves by master pressure applied to a right end, and a seal portion 43 mounted onto the piston 42 contacts with a valve portion material 44, thus interrupting a communicating chamber 46 and the communicating passage 49. When the piston 42 further moves left, a right end 42a of the piston is exposed into the communicating chamber 46.

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