Hydraulic apparatus and anti-lock brake control apparatus for a vehicle

Abstract

In a hydraulic apparatus providing a base with a discharge passage coupler to a circumferential portion of an annular discharge passage and to a damper chamber, a hydraulic device is connected via an orifice to the discharge passage without arranging the annular discharge passage between the damper chamber and the orifices, so that the damper chamber and the orifices cooperate together to exert an effective attenuating action thereon so as to suppress the transfer of pressure pulsation thereto effectively. Further, in an anti-lock brake control apparatus providing a pipe member which integrally includes an orifice interposed between a damper and a normally open electromagnetic valve, a sheet pipe corrected to an inner end of a connecting hole coaxially with the orifice, and a coupling pipe portion coaxially formed between the orifice and the sheet pipe, the sheet pipe is fitted into a large-diameter portion of the base and the orifice is fitted into a small-diameter portion of the base, thus the number of component parts is reduced and the normally open electromagnetic valves are prevented from malfunctioning due to the clogging of the orifices by dust.

Dependencies are inferred from the claim text.