POWER TRANSMISSION DEVICE

An object of the present invention is to provide a power transmitting apparatus which can surely start an engine by a kick-starter means without increasing the power transmitting capacity and thus the size of the power transmitting apparatus. According to the present invention, there is provided a power transmitting apparatus comprising a clutch housing rotatable together with an input member connected to an engine and mounted thereon a plurality of driving-side clutch discs; a clutch member connected to an output member; a plurality of driven-side clutch discs arranged between the driving-side clutch discs alternately therewith; a pressure member for forcing the driving-side clutch discs and the driven-side cutch discs to be press-contacted each other and to release the press-contacting force acting on them in accordance with approach or separation of the pressure member relative to the clutch member; and a kick-starter means being able to apply a rotational force to the output member to start the engine by transmitting the rotational force to the engine via the clutch member; and being adapted to be able to transmit or cut off the driving power of the engine inputted to the input member to or from the output member by press-contacting the driving-side clutch discs with the driven-side clutch discs or releasing a press-contacting force acting on them characterized in further comprising a press-contact assisting cam of inverse-driving side for increasing the press-contacting force acting on the driving-side clutch discs and the driven-side clutch discs when the rotational force is applied to the output member by the kick starter means.