Worm gear for a worm gear system in a motor vehicle steering device having an injection-moulded support ring

Patent metadata

Field	Value
Publication number	US-11255420-B2
Application number	US-201816769317-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 22, 2017
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A worm gear for a worm gear system of a motor vehicle steering device may include a hub, a support element, and a gear rim. The support element may be a support ring that by means of an injection-molding method is injected between the gear rim and the hub. The support ring may connect in a form-fitting manner the hub and the gear rim. The gear rim and the support element may configure a multiplicity of teeth. The support element may have support webs that penetrate the gear rim such that radially outward pointing end sides of the support webs are exposed.

First claim

What is claimed is:

1. A worm gear for a worm gear system of a motor vehicle steering device, the worm gear comprising:
a hub;
a gear rim; and
a support element configured as a support ring that is injection molded between the gear rim and the hub so as to connect the gear rim and the hub in a form-fitting manner, wherein the gear rim and the support element configure teeth, wherein the support element has support webs that penetrate the gear rim such that radially outward pointing end sides of the support webs are exposed, wherein the support webs extend across an entire width of the worm gear in a region of the teeth.

2. The worm gear of claim 1 wherein the gear rim includes tooth elements configured as tooth flanks of the teeth.

3. The worm gear of claim 2 wherein in each case one of the tooth elements is configured as one of the tooth flanks of two neighboring teeth of the teeth.

4. The worm gear of claim 1 wherein the support webs have a constant width.

5. The worm gear of claim 1 wherein the support webs extend in a radially outward direction from an annular web of the support element.

6. The worm gear of claim 1 wherein the gear rim is a single-component plastics material part.

7. The worm gear of claim 1 wherein the hub is configured as an insert part that has injection bores that are configured for injecting plastic for configuring the support ring.

8. A method for producing a worm gear for a worm gear system of a motor vehicle steering device, the method comprising:
providing a hub of the worm gear, the hub being configured as an insert part;
inserting the insert part into a gear rim of the worm gear; and
injecting plastic between the gear rim and the insert part by way of injection molding to configure a support element of the worm gear as a support ring that connects in a form-fitting manner the hub and the gear rim, wherein the gear rim and the support element configure teeth, wherein the support element includes support webs that penetrate the gear rim such that radially outward pointing end sides of the support webs are exposed,
wherein the gear rim has tooth elements that configure tooth flanks of the teeth, wherein the support webs are in each case disposed between two of the tooth flanks of one of the teeth.

9. The method of claim 8 wherein in each case one of the tooth elements is configured as one of the tooth flanks of two neighboring teeth of the teeth.

10. The method of claim 8 wherein the support webs extend across an entire width of the worm gear in a region of the teeth.

11. The method of claim 8 wherein the support webs have a constant width.

12. A worm gear for a worm gear system of a motor vehicle steering device, the worm gear comprising:
a hub;
a gear rim; and
a support element configured as a support ring that is injection molded between the gear rim and the hub so as to connect the gear rim and the hub in a form-fitting manner, wherein the gear rim and the support element configure teeth, wherein the support element has support webs that penetrate the gear rim such that radially outward pointing end sides of the support webs are exposed,
wherein the gear rim includes tooth elements configured as tooth flanks of the teeth, wherein in each case one of the tooth elements is configured as one of the tooth flanks of two neighboring teeth of the teeth, wherein the support webs are in each case disposed between two of the tooth flanks of one of the teeth.

13. The worm gear of claim 12 wherein the support webs extend across an entire width of the worm gear in a region of the teeth.

14. The worm gear of claim 12 wherein the support webs have a constant width.

15. The worm gear of claim 12 wherein the support webs extend in a radially outward direction from an annular web of the support element.

16. The worm gear of claim 12 wherein the gear rim is a single-component plastics material part.

17. The worm gear of claim 12 wherein the hub is configured as an insert part that has injection bores that are configured for injecting plastic for configuring the support ring.

Assignees

• Thyssenkrupp Presta Ag
• Thyssenkrupp Ag

Inventors

• Ernstson Gernot
• Peter Manuel

Classifications

• F16H1/16

  comprising worm and worm-wheel · CPC title

• B29C45/14491

  Injecting material between coaxial articles, e.g. between a core and an outside sleeve for making a roll · CPC title

• B29L2031/30

  Vehicles, e.g. ships or aircraft, or body parts thereof {(vanes or blades B29L2031/08, air bags B29L2022/027)} · CPC title

• F16H2055/065

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

• B29L2015/003

  Gears · CPC title