Gear, robot, and gear production method
AssigneeDIC Corporation
InventorsRyuhei KUROKAWA, Kunito KURATA, Yoshihisa TAKAHASHI, Kotaro MORI
Life of this patent
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Abstract
A gear formed of a resin containing a filler includes a plurality of recesses that are formed on a shaft-direction end surface of the gear, that spread from one side to the other side of respective straight lines extending outward in the radial direction of the gear from respective corresponding gate points, and that have asymmetric shapes with respect to the respective straight lines, where each of a plurality of points on the shaft-direction end surface corresponding one-to-one to a plurality of pin gates used to eject the resin during molding of the gear is taken as the gate point.
Claims12
A gear formed of a resin containing a filler, comprising:
- a plurality of recesses that are formed on a shaft-direction end surface of the gear, that spread from one side to the other side of respective straight lines extending outward in the radial direction of the gear from respective corresponding gate points, and that have asymmetric shapes with respect to the respective straight lines, where each of a plurality of points on the shaft-direction end surface corresponding one-to-one to a plurality of pin gates used to eject the resin during molding of the gear is taken as the gate point.
A gear production method comprising:
- melting a resin containing a filler;
- and
- molding a resin gear by ejecting a molten resin from a plurality of pin gates into a cavity of a metal mold that is a gear-molding metal mold having the plurality of pin gates and that includes a plurality of protrusions spreading from one side to the other side of respective straight lines extending outward in the radial direction of the metal mold from the respective corresponding pin gates and having asymmetric shapes with respect to the respective straight lines.
Dependencies are inferred from the claim text.