Speed reducer casing, speed reducer, and method of manufacturing speed reducer casing

Patent metadata

Field	Value
Publication number	US-11499622-B2
Application number	US-202117212598-A
Country	US
Kind code	B2
Filing date	Mar 25, 2021
Priority date	Apr 30, 2020
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A speed reducer casing of the present invention has inner teeth on an inner periphery thereof. The speed reducer casing includes an inner tooth portion and a casing body portion, the inner tooth portion including the inner teeth, the casing body portion supporting the inner tooth portion. The inner tooth portion is formed of a material having a higher slidability than the casing body portion. The casing body portion is formed of a material having a higher hardness than the inner tooth portion.

First claim

What is claimed is:

1. A speed reducer casing having inner teeth on an inner periphery thereof, the speed reducer casing comprising:
an inner tooth portion including the inner teeth; and
a casing body portion supporting the inner tooth portion,
wherein a material forming the inner tooth portion is different from a material forming the casing body portion,
the material forming the inner tooth portion has a higher slidability than the material forming the casing body portion, and
wherein the material forming the casing body portion has a higher hardness than the material forming the inner tooth portion.

2. The speed reducer casing of claim 1 , wherein the casing body portion is formed of a material having a higher melting point than the inner tooth portion.

3. The speed reducer casing of claim 1 , wherein the casing body portion has such a tubular shape as to cover at least a radially outer region of the inner tooth portion.

4. The speed reducer casing of claim 3 , wherein the inner teeth of the inner tooth portion are formed of pin grooves retaining therein columnar inner tooth pins so as to be slidable.

5. A speed reducer comprising:
the speed reducer casing of claim 1 ; and
a speed reduction mechanism disposed inside the speed reducer casing.

6. The speed reducer casing of claim 1 ,
wherein the casing body portion is formed of a light metal having a high specific strength.

7. The speed reducer casing of claim 6 ,
wherein the casing body portion is formed of an aluminum alloy.

8. The speed reducer casing of claim 6 ,
wherein the inner tooth portion is formed of a hard resin.

9. The speed reducer casing of claim 8 ,
wherein the inner tooth portion is formed of an engineering plastic.

10. The speed reducer casing of claim 7 ,
wherein the inner tooth portion is formed of a hard resin.

11. The speed reducer casing of claim 10 ,
wherein the inner tooth portion is formed of an engineering plastic.

12. The speed reducer casing of claim 1 ,
wherein the inner tooth portion is formed of a hard resin.

13. The speed reducer casing of claim 12 ,
wherein the inner tooth portion is formed of an engineering plastic.

14. A method of manufacturing a speed reducer casing having inner teeth on an inner periphery thereof,
wherein the speed reducer casing includes an inner tooth portion and a casing body portion, the inner tooth portion including the inner teeth, the casing body portion supporting the inner tooth portion, a material forming the inner tooth portion being different from a material forming the casing body portion, the material forming the inner tooth portion having a higher slidability than the material forming the casing body portion, and the material forming the casing body portion having a higher hardness than the material forming the inner tooth portion,
the method comprises:
forming the casing body portion first; and
setting the casing body portion in a mold and forming the inner tooth portion by injection molding.

Assignees

• Nabtesco Corp

Inventors

• Makisumi Kazuyoshi

Classifications

• F16H2001/325

  comprising a carrier with pins guiding at least one orbital gear with circular holes · CPC title

• F16H1/32 Primary

  in which the central axis of the gearing lies inside the periphery of an orbital gear · CPC title

• B29C45/1459

  Coating annular articles · CPC title

• F16H57/023 Primary

  Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly · CPC title

• F16H57/032

  characterised by the materials used · CPC title