Patent ID: 8413628

Claim:
A ring gear that transmits starting torque output from a starter motor to a crankshaft side member, which rotates with a crankshaft of an internal combustion engine, through a one-way clutch, the ring gear comprising: a plurality of regionally formed bodies that are separately formed corresponding to at least two regions that include a race side region including one race portion of the one-way clutch, and a gear side region to which the starting torque is transmitted from the starter motor via gear mesh, wherein a whole shape of the ring gear is radially divided into the at least two regions; and an inter-region joint portion joining the regionally formed bodies, wherein the regionally formed bodies are separately formed corresponding to three regions of the race side region, the gear side region, and an intermediate region that is a region between the race side region and the gear side region, wherein the whole shape of the ring gear is divided into the three regions.