| 摘要 |
PROBLEM TO BE SOLVED: To provide a net formed gear member and a manufacturing method thereof, provided with a gear body having a generally cylindrical outer surface for forming the plurality of radially outwardly extending gear teeth on the cylindrical outer surface. SOLUTION: The gear member for an automatically shiftable vehicular transmission having the gear body provided with the plurality of gear teeth extended to the outside in the diameter direction formed on the generally cylindrical outer-surface is provided. The internal face is arranged to almost the same axis to the generally cylindrical outer surface and extended to at least one portion of the gear body. Further, a plurality of splines extended to the inside in the diameter direction are formed on at least the one portion of the inner surface. At least one among the plurality of gear teeth extended to the outside in the diameter direction and the plurality of splines extended to the inside in the diameter direction are cold extruded. A method, with which the gear member containing a step for generally forming tubular blank by reversely extruding the whole cylindrical slug, is provided, too. Thereafter, for forming the gear member, the plurality of gear teeth are generally formed at least on one portion of the tubular blank with the cold-extrusion. COPYRIGHT: (C)2007,JPO&INPIT |
