| 摘要 |
PROBLEM TO BE SOLVED: To achieve enhanced durability and reliability and simplify the assembly work. SOLUTION: A holder 28a for a clutch constituting a roller clutch 10a is restrained from being displaced along an axial direction. A part of the holder 28a for the clutch is prevented from being rubbed with a part rotating together with a driven pulley 7a and hence heat generation from overrunning is prevented. Thus, deterioration of grease is prevented, and durability and reliability are improved. A chamfered part is provided on the periphery of an axial end part of an outer ring 25 for the clutch and a plurality of rollers 26 constituting the roller clutch 10a. Thus, the position of the respective rollers 26 along a circumferential direction is maintained suitably, and the outer ring 25 for the clutch is easily installed on an outer diameter side of the respective rollers 26. Accordingly, the assemble work is simplified. |
