Patent ID: 7237664

Claim:
A power transmitting apparatus comprising: a clutch housing rotatable together with an input member; a plurality of driving clutch plates each having projections projecting radially outward from the periphery of the driving clutch plate for engaging the clutch housing to rotate together with the housing; a clutch member connected to an output member and having a plurality of driven clutch plates alternately arranged between the driving clutch plates; a pressure plate mounted on the clutch member moveable in an axial direction of the clutch member for carrying out pressure-contact or release of the driving clutch plates relative to the driven clutch plates via the axial movement of the driving clutch plates relative to the clutch member where a rotational force inputted to the input member can be transmitted to or cut off from the output member via the pressure-contact or release between the driving clutch plates and driven clutch plates; each of the driving clutch plates is substantially planar and defines a plane, said projections being in said plane, each driving plate has a peripheral surface, a pair of projected wall surfaces of the projection, and a pair of connecting surfaces one on each side of said projection, each connecting surface connecting the projected wall surfaces and the peripheral surface, and each of the connecting surfaces is an arcuate surface smoothly merged into the projected wall surface and forms an undercut recessed radially inward from the peripheral surface of the driving clutch plate.