To prevent early wear of a pin and a recessed groove in a torque transmission means.
This reverse input cut-off clutch comprises input and output shafts 22, 23; a fixed outer ring 21; a locking means comprising a roller provided in a freely engaged/detached manner between the fixed outer ring 21 and the output shaft 23, and an elastic member for energizing the roller in a direction to be engaged between the fixed outer ring 21 and the output shaft 23, and locking the output shaft 23 to reverse input torque from the output shaft 23 while releasing a locked state to rotational torque from the input shaft 22; and the torque transmission means provided between the input and output shafts 22, 23 to transmit the rotational torque from the input shaft 22 to the output shaft 23 in a lock release state. The torque transmission means 45 is composed of the pin 28 radially projecting toward the input shaft 22 from the output shaft 23, and the recessed groove 27 formed in the input shaft 22 along an axial direction to fit the pin 28 therein and engaged with the pin 28 when transmitting torque. The radial angle of an engaging face 27a of the recessed groove 27 is set so that the outer peripheral surface 28a of the pin 28 and the engaging face 27a of the recessed groove 27 abut each other in a parallel state.
TATEISHI YASUSHI
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
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