Patent ID: 9068640
Filing Date: 2015-06-30
Classification: F16H,Y10T

Abstract:
1. A fastening structure for ring gear and differential case, including: a ring gear having an outer peripheral surface formed with a gear section and an inner peripheral surface formed with a plurality of notch portions recessed from the inner peripheral surface; a differential case including a press-fit surface on which the ring gear is press-fitted and a flange portion formed at an end of the press-fit surface and pressed against the notch portions, the ring gear is press-fitted on the press-fit surface and then the flange portion is pressed against the notch portions to fasten the differential case to the ring gear by caulking, wherein the notch portions each have: the notch portions are each formed with a recess on the step surfaces so that the recess is concave on an opposite side from the flange portion to release part of caulking load acting on the step surfaces into the recess.