US 11,732,760 B2
Power transmission device
Yoshihiko Ozawa, Hamamatsu (JP); Han Hiong Chen, Hamamatsu (JP); Makoto Kataoka, Hamamatsu (JP); and Masataka Murai, Hamamatsu (JP)
Assigned to Kabushiki Kaisha F.C.C., Hamamatsu (JP)
Filed by Kabushiki Kaisha F.C.C., Hamamatsu (JP)
Filed on Jul. 31, 2022, as Appl. No. 17/877,977.
Application 17/877,977 is a continuation of application No. 17/336,447, filed on Jun. 2, 2021, granted, now 11,460,077.
Application 17/336,447 is a continuation of application No. PCT/JP2019/047408, filed on Dec. 4, 2019.
Claims priority of application No. 2018-227995 (JP), filed on Dec. 5, 2018.
Prior Publication US 2022/0373040 A1, Nov. 24, 2022
Int. Cl. F16D 13/56 (2006.01); F16D 43/12 (2006.01)
CPC F16D 13/56 (2013.01) [F16D 43/12 (2013.01); F16D 2013/565 (2013.01)] 10 Claims
OG exemplary drawing
 
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.