Apparatus for hydraulically operating clutch

Abstract

A flow limiting device provided between a clutch master cylinder and a clutch operating cylinder has a first fluid chamber on one axial side in communication with the clutch master cylinder, a second fluid chamber on the axially opposite side in communication with the clutch operating cylinder, and a piston for partitioning the first and second fluid chambers. The piston has on a circumference thereof an annular groove in communication with the second fluid chamber through an inner passage, and a land on the axially opposite side of the annular groove. As passages to communicate the second fluid chamber and the clutch operating cylinder, there are provided a first passage opening into the cylinder portion in a position away in the axially opposite side relative to the land when the piston is in one stroke position at which the clutch is disengaged, and a second passage opening into the cylinder portion at a position coinciding with a position of the annular groove when the piston is in said one stroke position. When the piston is in an axially intermediate stroke position in which the clutch is in the clutch-slipping state, an opening of the second passage is closed by the land. In the first passage, there is interposed a one-way valve having an orifice which has an easy flow direction in a direction toward the clutch operating cylinder.