Patent ID: 6964166

Claim:
A hydraulic master cylinder for vehicle comprising: a cylinder main body opening at both ends thereof and including a discharge port; a bottomed cylindrical sleeve inserted into the cylinder main body and including an outlet port for a working fluid communicating with the discharge port; a plurality of seal rings for sealing a periphery of the outlet port fluid tightly; a plug having a threaded portion on an outer circumference thereof and abutting with the sleeve, a lid member comprising the sleeve and the plug, and mounted via the seal rings in an opening at one end of the cylinder main body so as to form a bottomed cylinder bore; and a piston inserted into the cylinder bore so as to form a hydraulic pressure chamber between the piston and the lid member; wherein the sleeve is inserted into the cylinder main body with an open end thereof being made to face an interior of the cylinder main body so as to dispose the seal rings between a circumferential wall of the cylinder bore and the sleeve and in such a manner that the seal rings hold the outlet port therebetween, and the plug is fixedly threaded in the opening at the one end so as to prevent the dislocation of the sleeve.