| 摘要 |
PROBLEM TO BE SOLVED: To secure the roundness of a bearing which is pressure-inserted into a large end part of a connecting rod while suppressing to the minimum an increase of the weight of the connecting rod of a vehicle power transmission device.SOLUTION: A penetration hole 19d which penetrates both surfaces in an axial direction is formed at a connecting part 19c of a connecting rod 19, and a center Oc of a circular disc which constitutes an inner edge part Ea facing a large end part 19a of the penetration hole 19d is decentered to a small end part 19b side with respect to a center Ob of an external peripheral face Pb of the large end part 19a. Thus, by preventing an abrupt change of the rigidity of the large end part 19a in a circumferential direction while lowering the rigidity by reducing a radial wall thickness t of the large end part 19a in the vicinity of two points in which the large end part 19a is connected to the connecting part 19c at both ends in the circumferential direction of the penetration hole 19b and the rigidity is enhanced, a pressure-insertion reaction force is mildly changed to the circumferential direction, and the roundness of a bearing 20 can be enhanced. Furthermore, an increase of the weight and dimension of the connecting rod 19 can be suppressed to the minimum compared with the case that the roundness of the bearing 20 is enhanced by making the wall thickness of the large end part 19a thicker as a whole. |
