CPC F16D 13/56 (2013.01) [F16D 43/12 (2013.01); F16D 2013/565 (2013.01)] | 10 Claims |
1. A power transmission device comprising:
a clutch member includes a plurality of driven-side clutch plates that are alternately formed with a plurality of drive-side clutch plates of a clutch housing rotating together with an input member rotated by engine driving power of a vehicle, the clutch member coupled with an output member rotating a wheel of the vehicle;
a weight member movable from a radially-inner position to a radially-outer position due to a centrifugal force generated as the clutch housing rotates;
an interlocking member switching the drive-side clutch plates and the driven-side clutch plates from a non-operating state, where a press-contact force between the drive-side clutch plates and the driven-side clutch plates is released, to an operating state, where the driving power of the engine is able to be transmitted to the wheel by pressing the drive-side clutch plates and the driven-side clutch plates against each other as the weight member moves from the radially-inner position to the radially-outer position;
the clutch member includes
a first clutch member coupled to the output member,
a second clutch member attached to the driven-side clutch plates;
a back-torque transmitting cam pressing the drive-side clutch plates and the driven-side clutch plates against each other by moving the second clutch member when a rotational force is input to the first clutch member via the output member, and
a torque transmission portion formed on each of the first clutch member and the second clutch member to transmit a rotational force transmitted to the second clutch member to the first clutch member not via the back-torque transmitting cam,
the torque transmission portion is located radially inside of the drive-side clutch plates and the driven-side clutch plates.
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