Gear manufacturing method and gear

Patent metadata

Field	Value
Publication number	US-11959538-B2
Application number	US-202017758680-A
Country	US
Kind code	B2
Filing date	Dec 16, 2020
Priority date	Jan 15, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A gear manufacturing method, the gear including an annular gear portion including teeth on an outer periphery, an annular support portion provided on an inner peripheral surface of the gear portion and supporting the gear portion, and a core portion provided inside the support portion, the method includes: a support portion molding step of molding the support portion by disposing the gear portion and the core portion in an annular mold and filling a resin between the gear portion and the core portion; and a support portion cooling step of cooling the support portion molded in the support portion molding step, a radial gap between the teeth of the gear portion and the mold before the support portion molding step is set to be smaller than a radial shrinkage amount of the support portion in the support portion cooling step.

First claim

The invention claimed is:

1. A gear manufacturing method, the gear including an annular gear portion having teeth on an outer periphery, an annular support portion provided on an inner peripheral surface of the gear portion and supporting the gear portion, and a core portion provided inside the support portion, the method comprising:
a support portion molding step of molding the support portion by disposing the gear portion and the core portion in an annular mold and filling a resin between the gear portion and the core portion; and
a support portion cooling step of cooling the support portion molded in the support portion molding step, wherein
a radial gap between the teeth of the gear portion and the mold before the support portion molding step is set to be smaller than a radial shrinkage amount of the support portion in the support portion cooling step.

2. The gear manufacturing method according to claim 1 , wherein
an inner diameter of the mold is set based on the radial shrinkage amount of the support portion in the support portion cooling step and a design value of an outer diameter of the gear portion.

3. The gear manufacturing method according to claim 1 , wherein
an outer diameter of the gear portion before the support portion molding step is set based on an inner diameter of the mold and the radial shrinkage amount of the support portion in the support portion cooling step.

Assignees

• Kyb Corp

Inventors

• Ogura Shogo

Classifications

• F16H55/06 Primary

  Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties · CPC title

• B29D15/00

  Producing gear wheels or similar articles with grooves or projections, e.g. control knobs · CPC title

• F16H55/22

  for transmissions with crossing shafts, especially worms, worm-gears · CPC title

• F16H2055/065

  Moulded gears, e.g. inserts therefor · CPC title

• B29C33/12

  with incorporated means for positioning inserts, e.g. labels {(positioning reinforcements B29C70/541)} · CPC title