Clutch master cylinder

Abstract

A clutch master cylinder comprises a master cylinder body provided thereon with a fluid reservoir tank and therein with an inlet port in communication with the reservoir tank and an outlet port for connection to a slave cylinder, a piston axially slidably disposed within the cylinder body and arranged to be moved inward by a push-rod, a valve seat arranged between the inlet and outlet ports within the cylinder body to permit fluid flow passing therethrough, a valve body associated with the piston to cooperate with the valve seat in response to inward movement of the piston, a fixed plug mounted on the cylinder body, and an adjusting plug disposed within the cylinder body to adjust an axial space between the valve seat and the valve body, the adjusting plug having an outer end portion adjustably threaded into the fixed plug and fastened in place by a lock nut threaded thereon and being provided at an intermediate portion thereof with an annular flange engageable with the inner end of the fixed plug to restrict outward movement of the adjusting plug.