Patent ID: 8336695

Claim:
A power transmitting apparatus comprising: a clutch housing rotatable together with an input member and supporting a plurality of driving clutch plates; a clutch member supporting a plurality of driven clutch plates alternately arranged between the driving clutch plates via spline fitting and connected to an output member; a pressure member mounted on the clutch member so as to be axially movably therealong and configured to provide pressure-contact and release between the driving clutch plates and the driven clutch plates; and back-torque limiting cams configured to release the connection between the driving clutch plates and the driven clutch plates when the rotation speed of the output member exceeds that of the input member; wherein a rotational force input to the input member can be transmitted to the output member by pressure-contacting driving clutch plates and the driven clutch plates and the rotational force input to the input member can be cut-off from the output member by releasing the driving clutch plates and the driven clutch plates from each other; wherein the driven clutch plates are supported by a two-part structure in which some of the driven clutch plates are supported on the clutch member by a clutch member spline fitting portion and the other driven clutch plates are supported on the pressure member by a pressure member spline fitting portion; and means for preventing slipping-off of the driven clutch plates into a separated portion between the spline fitting portion of the clutch member and the spline fitting portion of the pressure member, wherein said means for preventing slipping-off comprises a structure in which the diameter of the spline fitting portion for the driven clutch plates on the clutch member is different from that of the spline fitting portion for the driven clutch plates on the pressure member so that the spline fitting portions are adapted to be moved each other in an overlapped manner.