Transmission element and method for producing a transmission element

Patent metadata

Field	Value
Publication number	US-12055204-B2
Application number	US-202017426532-A
Country	US
Kind code	B2
Filing date	Feb 11, 2020
Priority date	Feb 12, 2019
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A toothed transmission element includes a partial region formed with a first material, teeth defining an edge region which is formed additively with a second material having a hardness which is greater than a hardness of the first material, and a third material located between the first material and the second material, wherein a hardness decreases stepwise along a section leading from the edge region to the partial region.

First claim

The invention claimed is:

1. A toothed transmission element, comprising:
a partial region formed with a first material having a first Vickers hardness;
an edge region formed with a second material having a second Vickers hardness which is greater than the Vickers hardness of the first material, the edge region formed additively on the partial region; and
a third material having a third Vickers hardness located between the first material and the second material, wherein the Vickers hardnesses of the materials decrease stepwise in a radial direction along a section leading from the edge region to the partial region,
wherein a difference in the Vickers hardness of the second material and the Vickers hardness of the first material is at least 100, and the second material has a Vickers hardness of at least 500, and the first material has a Vickers hardness of at most 400 HV,
wherein the transmission element is constructed in the form of a gearwheel,
further comprising at least one or more teeth defining the edge region, wherein at least one or more of the teeth has or have the edge region formed additively with the second material,
and further comprising a circular gearwheel core radially inside the at least one or more teeth, wherein inner parts of the at least one or more teeth are part of the circular gearwheel core and the circular gearwheel core and inner parts of the at least one or more teeth are provided by machining.

2. The transmission element of claim 1 , wherein the partial region is formed additively or the partial region is formed through primary forming, casting, forming, forging, subtractively, or by machining.

3. The transmission element of claim 1 , wherein the first material has a ductility which is higher than a ductility of the second material or the second material has an internal compressive stress which is greater than the internal compressive stress of the first material.

4. The transmission element of claim 1 , wherein the third material, between the first and second material is formed additively.

5. The transmission element of claim 1 , wherein the first material is formed with or from case-hardened steel and/or nickel-based alloy.

6. The transmission element of claim 1 , wherein the second material is formed with or from tungsten carbide, and/or a nickel-based alloy which has long-term thermal stability at at least 250 degrees Celsius.

7. The transmission element of claim 1 , wherein at least the second material is formed by laser deposition welding, laser wire deposition welding or laser powder deposition welding, and/or thermal spraying and/or cold gas spraying and/or arc deposition welding and/or by a powder bed process, laser beam melting and/or selective laser melting and/or electron beam melting.

8. A method for producing a toothed transmission element constructed in the form of a gearwheel, said method comprising:
forming a partial region with a first material having a first Vickers hardness, the partial region comprising a circular gearwheel core radially inside at least one or more teeth, wherein inner parts of the at least one or more teeth are part of the circular gearwheel core, and the circular gearwheel core and the inner parts of the at least one or more teeth are provided by machining;
forming an edge region which is formed additively on the partial region, the edge region comprising the at least one or more teeth defining the edge region, with a second material by laser deposition welding, laser wire deposition welding, and/or thermal spraying and/or arc deposition welding and/or a powder bed process and/or selective laser melting, with the second material having a second Vickers hardness which is greater than the Vickers hardness of the first material; and
forming a third material having a third Vickers hardness, the third material located between the first material and the second material, wherein the Vickers hardnesses of the materials decrease stepwise in a radial direction along a section leading from the edge region to the partial region,
wherein a difference in the Vickers hardness of the second material and the Vickers hardness of the first material is at least 100, and the second material has a Vickers hardness of at least 500, and the first material has a Vickers hardness of at most 400 HV.

9. A transmission, comprising a transmission element as set forth in claim 1 .

10. A machine, comprising a transmission as set forth in claim 9 .

11. A turbine, comprising a transmission as set forth in claim 9 or an electric machine comprising said transmission.

12. The transmission element of claim 1 , wherein the edge region provides an outer circumference of the transmission element.

13. The transmission element of claim 1 , wherein the edge region provides an outer circumference of the at least one or more teeth.

14. The transmission element of claim 1 , further comprising additional materials between the first and second materials.

15. The transmission element of claim 1 , wherein the partial region forms an innermost region of the transmission element.

16. The transmission element of claim 1 , wherein the partial region forms an innermost region of the transmission element and the edge region forms an outermost region of the transmission element.

17. The transmission element of claim 1 , wherein the first material, the second material, and the third material are different materials.

18. The transmission element of claim 15 , wherein the first material, the second material, and the third material are different distinguishable regions of different materials and different hardnesses.

19. The transmission element of claim 1 , wherein the edge regions are formed by only a portion of the at least one or more teeth.

20. The transmission element of claim 1 , wherein the partial region is formed by the circular gearwheel core.

21. The transmission element of claim 1 , wherein the circular gearwheel core is provided by subtractive production.

22. The transmission element of claim 21 , wherein the subtractive production is machining.

23. The transmission element of claim 1 , wherein the edge region is formed by every nth tooth of the at least one or more teeth.

Assignees

• Flender Gmbh

Inventors

• Kamps Tobias

Classifications

• F16H55/26

  Racks · CPC title

• F16H55/17

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• B23K26/342

  Build-up welding · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title