| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a gear with a rotating shaft, both of which are strongly fixed to each other, by constituting the gear and the rotating shaft of suitable resin materials respectively. SOLUTION: A rotating shaft 4 which passes through a gear 1 and is made of a material suitable for the gear 1 is injection-molded with the gear 1, in which a rotating shaft-inserting hole 2 is provided, as an insert. In this case, both sides of the gear 1 are pinched by flange members 5, which are swollen integrally radially from the rotating shaft 4. In the gear 1, a plurality of recessed parts 3 arranged so as to surround the rotating shaft inserting hole. At the injection molding of the rotating shaft, a resin material also fills the recessed part 3.
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