Clutch-actuating device and a coupling having a restriction mechanism and a conduit unit to be used with the clutch-actuating device

This invention relates to a clutch-actuating device and a coupling to be used therein for a vehicle whose transmission is shifted by manual operation. A clutch-actuating device includes a master cylinder actuated by depression of a clutch pedal, an operating cylinder actuated by fluid pressure fed from the master cylinder through a conduit which is connected to the master cylinder or the operating cylinder via a coupling member, and a restriction mechanism for restricting the flow of hydraulic fluid returning from the operating cylinder to the master cylinder, the restriction mechanism being incorporated in the coupling member. The operating cylinder (or master cylinder) of this clutch-actuating device can be commonly used regardless of whether a torque shock protection valve should be incorporated.