AUTOMATICALLY REGULATED FRICTION CLUTCH WITH PROTECTING FUNCTION AGAINST EXCESSIVE REGULATION

PROBLEM TO BE SOLVED: To provide a clutch having a regulating mechanism equipped with a moving limiter relatively insensitive to displacement or wear. SOLUTION: A regulating mechanism 36 for a friction clutch is composed of a pressure plate 22, a first ring-shaped can member 42 fixed to the pressure plate 22 rotatably and furnished with a plurality of first tapered cam faces 44, a second ring-shaped cam member 46 rotatable relative to the cam member 42 and furnished with a plurality of second tapered cam faces 48 to be engaged with the cam faces 44, a cam spring 54 to press the cam members 42 and 46 for generating rotation in the direction of increasing the cam height H, and a regulation limiting mechanism 62 comprising a plurality first pins 50, a ring- shaped regulating ring 64, and a plurality of first pin receptacle members 76. The second ring-shaped cam member 46 prescribes the effective thickness H of the pressure plate with respect to the engagement surface 20 in cooperation with the first ring-shaped cam member 42.