Resin gear, injection molding method for resin gear, resin-tooth-provided belt pulley, and resin rotator
Number of patents in Portfolio can not be more than 2000
United States of America
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Mar 3, 2020
Grant Date -
Apr 4, 2019
app pub date -
Feb 22, 2017
filing date -
Feb 22, 2017
priority date (Note) -
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Abstract
A resin gear includes a web with a side surface on which a first annular rib and a second annular rib are formed to be concentric with a boss. The web has an inner web portion coupling the first annular rib to the second annular rib, and an outer web portion coupling the second annular rib to a rim. The inner web portion is formed to have a thickness gradually reduced from one intersection point toward another intersection point, the intersection points being intersection points of a virtual radial direction line passing through a center of the boss with the second annular rib. The first annular rib has a side surface on which only one gate mark of an injection molding is formed at a position on a radially outer side with respect to a first tooth portion and a position biased to the other intersection point on the virtual radial direction line.
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