| 摘要 |
PROBLEM TO BE SOLVED: To reduce vibration and noise which are generated at engagement and the release of the engagement while avoiding the enlargement of a size of a oneway clutch, in a power transmission device for a vehicle having a crank-type power transmission unit.SOLUTION: Since a pair of triangular grooves 27 are formed at axial both ends of an external peripheral face 23a of an inner member 23, and axial groove widths D1 of the grooves 27 are gradually narrowed toward an engagement direction of a roller 25 in a peripheral direction, a torque variation at the engagement of a oneway clutch 21 and its release is moderated, and the generation of vibration and noise can be suppressed. Also, since the longer a distance from a drive output part 12a in the oneway clutch 21 is, the axial groove widths D1 of the grooves 27 become narrow, the distance from the drive output part 12a thereby becomes long, and also, since the milder the torque variation at the engagement and its release of the oneway clutch 21 is, a torque reduction amount by the grooves 27 becomes small, the enlargement of a diameter of the oneway clutch 21 can be thereby avoided, and the generation of the vibration and noise can be suppressed while suppressing the reduction of the torque transmission amount to the minimum.SELECTED DRAWING: Figure 10 |
