Housing for plastic gearbox and associated plastic gearbox and robot

Patent metadata

Field	Value
Publication number	US-11885405-B2
Application number	US-201817296743-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Dec 10, 2018
Publication date	Jan 30, 2024
Grant date	Jan 30, 2024

Abstract

A housing for a plastic gearbox and associated plastic gearbox and a robot. The housing includes a body including an inner engaging portion circumferentially arranged on an inner surface of the body, the inner engaging portion adapted to be engaged with a transmission assembly of the plastic gearbox; and an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body. By using the adjusting mechanism to squeeze the body of the housing inwardly, the fit error between the inner engaging portion and the transmission assembly can be compensated in an efficient way. Furthermore, the adjusting mechanism is a part of the housing and thus the body of the housing which is made of plastic does not need to be too thick, which makes injection molding easier and manufacturing precision improved.

First claim

What is claimed is:

1. A housing for a plastic gearbox, comprising:
a body comprising an inner engaging portion circumferentially arranged on an inner surface of the body, the inner engaging portion adapted to be engaged with a transmission assembly of the plastic gearbox; and
an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body, and
wherein the inner engaging portion comprises a plurality of gear teeth.

2. The housing of claim 1 , wherein the body comprises:
a first taper portion and a second taper portion axially arranged on an outer surface of the body, the first and second taper portions tapering in a direction away from each other, and
wherein the adjusting mechanism comprises:
a first squeeze body surrounding the first taper portion and comprising an inner surface fitted with the first taper portion;
a second squeeze body surrounding the second taper portion and comprising an inner surface fitted with the second taper portion; and
a plurality of adjusting elements arranged in a circumferential direction of the adjusting mechanism and coupled to the first and second squeeze bodies, the adjusting element being operable to move the first and second squeeze bodies towards each other to thereby squeeze the body.

3. The housing of claim 2 , wherein the adjusting mechanism further comprises a spacer arranged between the first and second squeeze bodies, the spacer defining a minimum distance between the first and second squeeze bodies.

4. The housing of claim 2 , wherein the adjusting element comprises an adjusting bolt having a self-locking helix angle.

5. The housing of claim 2 , wherein the plurality of adjusting elements are evenly arranged in the circumferential direction of the adjusting mechanism.

6. The housing of claim 1 , wherein the adjusting mechanism comprises:
an adjusting hoop surrounding the body and comprising a separating portion breaking the adjusting hoop in an axial direction; and
at least one adjusting element arranged tangentially at the separating portion and operable to reduce a circumferential size of the separating portion to thereby squeeze the body.

7. The housing of claim 6 , wherein the body is of a cylinder shape.

8. The plastic gearbox, comprising:
the housing of claim 1 ; and
the transmission assembly configured to be engaged with the inner engaging portion of the housing.

9. A robot, comprising the plastic gearbox of claim 8 .

10. A housing for a plastic gearbox, comprising:
a body comprising an inner engaging portion circumferentially arranged on an inner surface of the body, the inner engaging portion adapted to be engaged with a transmission assembly of the plastic gearbox; and
an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body, and
wherein the body comprises:
a first taper portion and a second taper portion axially arranged on an outer surface of the body, the first and second taper portions tapering in a direction away from each other, and
wherein the adjusting mechanism comprises:
a first squeeze body surrounding the first taper portion and comprising an inner surface fitted with the first taper portion;
a second squeeze body surrounding the second taper portion and comprising an inner surface fitted with the second taper portion; and
a plurality of adjusting elements arranged in a circumferential direction of the adjusting mechanism and coupled to the first and second squeeze bodies, the adjusting element being operable to move the first and second squeeze bodies towards each other to thereby squeeze the body.

11. The housing of claim 10 , wherein the adjusting mechanism further comprises a spacer arranged between the first and second squeeze bodies, the spacer defining a minimum distance between the first and second squeeze bodies.

12. The housing of claim 10 , wherein the adjusting element comprises an adjusting bolt having a self-locking helix angle.

13. The housing of claim 10 , wherein the plurality of adjusting elements are evenly arranged in the circumferential direction of the adjusting mechanism.

14. The housing of claim 10 , wherein the inner engaging portion comprises a plurality of cylinder pins arranged evenly in the inner surface of the body.

15. The housing of claim 10 , wherein the inner engaging portion comprises a frictional surface.

16. A housing for a plastic gearbox, comprising:
a body comprising an inner engaging portion circumferentially arranged on an inner surface of the body, the inner engaging portion adapted to be engaged with a transmission assembly of the plastic gearbox; and
an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body,
wherein the adjusting mechanism comprises:
an adjusting hoop surrounding the body and comprising a separating portion breaking the adjusting hoop in an axial direction; and
at least one adjusting element arranged tangentially at the separating portion and operable to reduce a circumferential size of the separating portion to thereby squeeze the body.

17. The housing of claim 16 , wherein the body is of a cylinder shape.

18. The housing of claim 16 , wherein the inner engaging portion comprises a plurality of cylinder pins arranged evenly in the inner surface of the body.

19. The housing of claim 16 , wherein the inner engaging portion comprises a frictional surface.

Assignees

• Abb Schweiz Ag

Inventors

• Gu Hao
• Yang Jibo
• Chen Han
• Song Wei
• Zhang Jiafan

Classifications

• F16H57/032 Primary

  characterised by the materials used · CPC title

• B25J9/102

  Gears specially adapted therefor, e.g. reduction gears (gearings in general F16H) · CPC title

• F16H1/32

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

• F16H2057/02021

  with means for adjusting alignment · CPC title

• F16H2057/0325

  Moulded casings made from plastic · CPC title