Power transmitting apparatus

摘要

An object of the present invention is to provide a power transmitting apparatus which can firmly avoid the problem caused by the back-torque as well as can always well perform the driving force cut-off operation. According to the present invention, there is provided a power transmitting apparatus comprising a clutch housing (2); and a clutch member (4) connected to an output member (3) and having a plurality of driven clutch plates (7) alternately arranged between the driving clutch plates (6) of the clutch housing (2); in which a rotational force inputted to the input member (1) can be transmitted to or cut-off from the output member (3) via pressure-contact or release between the driving clutch plates (6) and driven clutch plates (7) characterized in that it is provided with pressure-contact assisting cams a back-torque limiting and that the gradient angle (± 2) of the back-torque limiting cams is formed larger than the gradient angle (± 1) of the pressure-contact assisting cams.