Light-weight gear and manufacturing method thereof, manufacturing method of gear train, and robot
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United States of America Patent
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Feb 20, 2024
Grant Date -
Apr 13, 2023
app pub date -
Dec 14, 2022
filing date -
Aug 30, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A light-weight gear including: an annular tooth portion made of metal; a shaft extending along a central axis of the tooth portion and made of metal; and a coupling element configured to couple the shaft to the tooth portion and made of a resin, in which a joining part between the shaft and the coupling element and a joining part between the tooth portion and the coupling element are provided with irregularities configured to be engaged with one another in a circumferential direction, and corners of the irregularities are rounded to release a stress. Also, provided is a manufacturing method of a light-weight gear including: disposing the tooth portion and the shaft in a mold and injecting a molten resin into a cavity of the mold, thereby simultaneously performing injection molding of the coupling element and joining the coupling element to the tooth portion and the shaft.
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