Patent ID: 6837355

Claim:
A friction clutch to which a motive force of a drive source is transmitted via a torque transmitter and from which the motive force is intermittently transmitted to a driven device, comprising: a rotor having a drive side clutch plate and a cylindrical outer wall extending axially from the drive side clutch plate, wherein the drive side clutch plate and the cylindrical outer wall are integrally formed into a single piece by spinning, the outer wall being engageable with and rotatably driven by the torque transmitter; and a driven side clutch plate to be connected with the driven device and movable axially so as to be frictionally engaged with and rotated together with the drive side clutch plate, wherein the drive side clutch plate is provided with a depression formed by compressing and plastically press deforming a part of an axial end surface of the drive side clutch plate positioned on an opposite side to the outer wall with respect to the drive side clutch plate, so that the hardness of the drive side clutch plate at the depression is higher than that of the remainder of the drive side clutch plate.