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US 2009/0011071 A1Published application
Injection-molded gear
AssigneeEnplas Corporation
InventorToru Hagihara
Life of this patent
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AssigneeEnplas Corporation
InventorToru Hagihara
Estimating the term…
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.
An injection-molded gear in which a plurality of pin point gates open on a section within a cavity forming a roughly disk-shaped web, molten resin injected into the cavity from the plurality of pin point gates flow within the cavity in an outward radial direction, and a teeth section is formed on an outer circumference of the web, wherein:
Dependencies are inferred from the claim text.