| 摘要 |
PROBLEM TO BE SOLVED: To equalize lives of external peripheral faces of inner members of one-way clutches, in a power transmission device for a vehicle in which a plurality of crank-type power transmission units are arranged in parallel with one another.SOLUTION: An external peripheral face 23a of an inner member 23 comprises: a reference position immediately before the engagement of a roller 25 with a wedge-shaped space 26; an engagement finish position at which the roller 25 is completely engaged with the wedge-shaped space 26; and an engagement intermediate region between the reference position and the engagement finish position. A third curvature radius R3 of the engagement intermediate region is enlarged with respect to a first curvature radius R1 in the reference position and a second curvature radius R2 in the engagement finish position, and thus, the durability of the external peripheral face 23a can be equalized as a whole by enhancing the durability of the engagement intermediate region. Furthermore, a position of a transition point at which transition is performed to the second curvature radius R2 from the third curvature radius R3 is shifted more greatly to the engagement finish position side, as a one-way clutch 21 has a shorter distance from a drive output part 12a. Therefore, the durability of all of the one-way clutches 21 having different distances from the drive output part 23a can be equalized.SELECTED DRAWING: Figure 8 |
