| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a forged pinion to which high torque can be input while suppressing its upsizing, and a method for forming the forged pinion. Ž<P>SOLUTION: A forged pinion 1 has: a base part formed into a cylindrical shape; a support hole 5 supported on the outer periphery of an axial member, which is arranged in the axial center part of the base part in the direction of the axis of rotation and to which torque is transmitted; and gear teeth 7 erected on the periphery of the base part by forging the base part. Fiber flows 9 are flow-formed in forging on the base part and the gear teeth 7 in the direction crossing the direction of the tooth traces of the gear teeth 7. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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