| 摘要 |
PROBLEM TO BE SOLVED: To provide a clutch not increasing a length in an axial direction and providing a sufficient lock retention force against a rotation of a driven side rotating body and providing a sufficient engagement force between a drive side rotating body and a drive side rotating shaft to be engaged with the drive side rotating body. SOLUTION: A clutch C includes a drive side rotating body 35 having a flatted round recess part 35e formed on and a control surface 41 whose distance from a outer ring 31a of a collar 31 varies in a rotation direction, and is provided with a driven side rotating body 29 engaging with a drive side rotating body 35 in a rotation direction and a rolling body 32 rotating with the driven side rotating body 29 when the drive side rotating body 35 rotates and interposed between the control surface 41 and the outer ring 31a to obstruct rotation of the driven side rotating body 29 when the driven side rotating body 29 rotates. A recess part 29d is formed on a shaft center of the driven side rotating body 29 and a projection part 35c is formed on a shaft center part of the drive side rotating part 35. The projection part 35c is generally housed in the recess part 29d, and at least one of lengths in the axial direction of a contact area of the control surface 41 and the rolling body 32 and of the flatted round recess part 35e N2, M2 is maintained long. |
