| 摘要 |
PROBLEM TO BE SOLVED: To increase the reliability of an integrated product formed by fastening, by press-fitting, an annular member and a member to be fastened.SOLUTION: When a ring gear 14 is press-fitted to a differential case 12, an edge part 14h of the ring gear 14 is pressed against a stopper 12b of the differential case 12. The edge part 14h urges a part of the stopper 12b of the differential case 12 to deform elastically. The part of the stopper 12b of the differential case 12 is elastically deformed and intruded into a recessed part 14g of the ring gear 14, whereby a projecting engagement part 12d having a shape copying the recessed part 14g formed in one end surface 14b of the ring gear 14 is formed. A contact surface pressure PI acts between the recessed part 14g in one end surface 14b of the ring gear 14 and the projecting engagement part 12d of the stopper 12b of the differential case 12, and a frictional force is generated on the contact surfaces thereof, and both the ring gear and the differential case are strongly fastened to each other. |
