| 摘要 |
Disclosed herein is a gear structure which comprises a sectoral base member of metal plate; and an arcuate flange portion integrally formed on an arcuate flange portion integrally formed on an arcuate peripheral portion of the sectoral base member. The arcuate flange portion is formed on an outer surface of thereof with forged teeth. A method of producing the gear structure is also disclosed, which comprises (a) preparing a sectoral member of metal plate, the sectoral member including a sectoral base portion and an arcuate flange portion which is integrally formed on an arcuate peripheral portion of the sectoral base portion; (b) putting the sectoral member into a press device in such a manner that the arcuate flange portion is intimately sandwiched between first and second dies, the second die having formed thereon teeth which face the arcuate flange portion; and (c) pressing the arcuate flange portion by such a degree that the arcuate flange portion is deformed to define thereon teeth by the provision of the toothed second die. |
