Multi disc friction clutch and motorcycle therewith

A motor cycle provided with a multiple disc friction clutch, wherein the multiple disc friction clutch comprises:

• 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 plates and output 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.

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 clutch output shaft, 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 compression coil spring for pressing a pressing member toward the clutch hub in a direction parallel to the clutch output shaft;
• a spring receiving member for supporting the compression coil spring from an opposite side of the pressing member in an axial direction of the compression coil spring;
• and
• a coupling hub arranged in an outer periphery of the clutch output shaft 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 clutch output shaft, the coupling hub being arranged inside of the cylindrical outer member of the clutch hub,
• wherein the coupling hub is attached to the clutch hub so as to rotate with the clutch hub around the rotational axis of the clutch output shaft, and
• wherein a guide portion is provided between an inner peripheral surface of the coupling hub and an outer peripheral surface of the clutch output shaft, the guide portion guiding the coupling hub such that the spring receiving member moves toward the pressing member in an axial direction of the clutch output shaft and the coupling hub rotates relative to the clutch output shaft when torque is transmitted from the engine.