Patent ID: 8747275
Filing Date: 2014-06-10
Classification: F16H,Y10T

Abstract:
1. A differential device, comprising a differential case that houses a gear group, and a ring gear disposed fitted to the differential case, wherein the differential case and the ring gear are supported rotatably about a drive shaft, the ring gear comprises a helical gear having a ring-shaped structure, the ring gear abuts the differential case in an axial direction of the drive shaft, and the ring gear and the differential case are welded at an abutting portion between the ring gear and the differential case from outside in a radial direction of the ring gear, the ring gear has a gear portion on an outer periphery of the ring gear, a fitting portion fitted to the differential case on an inner periphery of the ring gear and a ring portion that couples the gear portion and the fitting portion, and the gear portion extends beyond the differential case in the radial direction.