Patent ID: 7681705

Claim:
A multiple disc friction clutch comprising: a clutch outer member for transferring power from an engine to the multiple disc friction clutch; a clutch hub for transferring power from the multiple disc friction clutch to a rotating member, the clutch hub having a cylindrical outer member; a plurality of input friction plates and output friction plates arranged between the clutch outer member and the clutch hub; a clutch spring for pressing a pressing member onto the friction plates in an axial direction of the rotating member so as to connect the multiple disc friction clutch; a spring receiving member for supporting the clutch spring; and a coupling hub arranged in an outer periphery of the rotating member and coupled to the spring receiving member such that the coupling hub and the spring receiving member are integrally movable in the axial direction of the rotating member, the coupling hub being arranged inside of the cylindrical outer member of the clutch hub, wherein inclined splines are formed on an inner peripheral surface of the coupling hub and an outer peripheral surface of the rotating member such that the coupling hub is operable to engage the rotating member, the inclined splines being inclined relative to the rotational axis of the rotating member, and wherein the multiple disc friction clutch is configured such that the coupling hub moves so as to compress the clutch spring in the axial direction of the rotating member and rotates relative to the rotating member when an engine drive torque is increased to a predetermined value or to more than the predetermined value.