| 摘要 |
PROBLEM TO BE SOLVED: To prevent only unidirectional rotation transmission from being inhibited by specifying the difference between average outer diameter dimension in a specific range from one end face in the axial direction of an outer ring toward the center side and average outer diameter dimension in a specific range from the other end face toward the center side. SOLUTION: When the average of maximum and minimum outer diameter dimensions at an α range part of 1.5-3.5 mm from one end face in the axial direction of an outer ring 2 toward the center side is D1 and the average of maximum and minimum outer diameter dimensions at a β range part of 1.5-3.5 mm from the other end face in the axial direction of the outer ring 2 toward the center side is D2 , |D1 -D2 |<=0.03 mm is to be satisfied. Only unidirectional rotation is transmitted between a holding member for fitting the outer ring 2 inside to fix it and a member inserted through inside the outer ring 2. The shape of a cam face 6 on the inner peripheral surface of the outer ring 2 does not therefore change much over the axial direction of the outer ring 2, and each roller 3 coming in contact with the cam face 6 is hardly inclined in the axial direction. As a result, one end part of the roller 3 does not bite into the cam face 6 at the time of locking a clutch, so that a lock state and an overrun state can be positively realized. |
