| 摘要 |
A high-strength, high-precision injection-molded gear is provided in which, regardless of the thickness of a web, the speed of flow of molten resin injected into a cavity from pin point gates can be equalized and a weld line formed in a merging section of the molten resin can be sufficiently reduced. Resin flow regulating projections 3 that partially thicken a web 7 are formed in a position on a side surface 11 side of the web 7 between pin point gates 12 and a teeth section 8 such as to project from the side surface 11 of the web 7. The resin flow regulating projections 3 are formed such that a projection height is the highest on a radial direction line 14 extending from the pin point gates 12 in the outward radial direction and gradually decreases away from the position on the radial direction line 14 in a circumferential direction of the web 7.
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