| 摘要 |
PROBLEM TO BE SOLVED: To further improve the reliability of a product in which an annular member and a member to be fastened are press-fit.SOLUTION: In a state where a ring gear 14 is press-fit into a differential case 12, a radial reaction force P by a press fitting margin acts on a press fitting surface 14a of the ring gear 14. Thus, the reaction force P provides an axial frictional force to fix the positions of the both. The ring gear 14 is separated, in a state where connection 18 is left, by a closed-end groove 16 disposed between the press fitting surface 14a of the ring gear 14 to the differential case 12 and a bottom surface 14e, which is a surface facing the press fitting surface. Therefore the radial reaction force P acting on the press fitting surface 14a of the ring gear 14 does not act on the bottom surface 14e of the ring gear 14, and is interrupted by the closed-end groove 16. As a result, a tensile stress caused by the reaction force P does not occur in the bottom surface 14e of the ring gear 14, and can avoid decrease in dedendum strength. |
