Patent ID: 8448770

Claim:
A multiplate clutch, comprising: a clutch outer member coupled to an input member, a clutch inner member coupled to an output member, a plurality of drive friction plates engaging said clutch outer member, a plurality of driven friction plates alternately superposed on said plurality of drive friction plates and engaging said clutch inner member, a sandwiching presser plate sandwiching said plurality of drive friction plates and said plurality of driven friction plates between said sandwiching pressure plate and said clutch inner member, a clutch spring which urges said clutch inner member or said sandwiching presser plate in a direction to sandwich said plurality of drive friction plates and said plurality of driven friction plates under pressure between said clutch inner member and said sandwiching presser plate, and an assistive cam mechanism including a first cam member having a first recess and a second cam member having a first tooth inserted in said first recess, wherein at least one of abutment surfaces of said first recess and said first tooth, in a power transmitting state for transmitting power from said input member to said output member, includes a first slanted surface formed such that an urging force of said clutch spring can be increased upon acceleration in said power transmitting state, and wherein an angle of intersection between said first slanted surface and a plane perpendicular to a clutch central axis is set to a range from 80 degrees to 85 degrees.