Turbocharger shaft and wheel assembly

Patent metadata

Field	Value
Publication number	US-10041351-B2
Application number	US-201414488112-A
Country	US
Kind code	B2
Filing date	Sep 16, 2014
Priority date	Sep 16, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A unit for a turbocharger can include a turbine wheel portion that includes a turbine wheel material and a turbine wheel axis; a shaft portion that includes a shaft material and a shaft axis; a first weld that includes a first average axial position over a first azimuthal span and first weld composition formed of a greater proportion of the turbine wheel material than the shaft material; and a second weld that includes a second average axial position over a second azimuthal span and second weld composition formed of a greater proportion of the turbine wheel material than the shaft material, where a sum of the first azimuthal span and the second azimuthal span is approximately 360 degrees, where the first average axial position differs from the second average axial position, and where the first weld composition differs from the second weld composition.

First claim

What is claimed is:

1. A unit for a turbocharger, the unit comprising:
a turbine wheel portion that comprises a turbine wheel material and a turbine wheel axis;
a shaft portion that comprises a shaft material and a shaft axis;
a first weld that comprises a first average axial position over a first azimuthal span and a first weld composition formed of a greater proportion of the turbine wheel material than the shaft material; and
a second weld that comprises a second average axial position over a second azimuthal span and a second weld composition formed of a greater proportion of the turbine wheel material than the shaft material,
wherein a sum of the first azimuthal span and the second azimuthal span is approximately 360 degrees,
wherein the first average axial position differs from the second average axial position, and
wherein the first weld composition differs from the second weld composition.

2. The unit of claim 1 wherein the first weld comprises a first axial width of a shank portion of 0.4 mm or less and wherein the second weld comprises a second axial width of a shank portion of 0.4 mm or less.

3. The unit of claim 1 comprising a run-out of less than 200 microns.

4. The unit of claim 1 wherein the turbine wheel material comprises nickel.

5. The unit of claim 1 wherein the turbine wheel portion comprises a bore.

6. The unit of claim 1 wherein the shaft portion comprises a spigot.

7. The unit of claim 1 wherein the shaft portion comprises a piloting spigot and the turbine wheel portion comprises a piloting bore.

8. The unit of claim 7 wherein a radial clearance exists between the piloting spigot and the piloting bore.

9. The unit of claim 1 wherein the shaft portion is without a piloting spigot and the turbine wheel portion is without a piloting bore.

10. The unit of claim 1 wherein the first azimuthal span is approximately 180 degrees and wherein the second azimuthal span is approximately 180 degrees.

11. A turbocharger comprising:
a compressor housing;
a center housing;
a turbine housing; and
a unit that comprises
a turbine wheel portion that comprises a turbine wheel material and a turbine wheel axis;
a shaft portion that comprises a shaft material and a shaft axis;
a first weld that comprises a first average axial position over a first azimuthal span and a first weld composition formed of a greater proportion of the turbine wheel material than the shaft material; and
a second weld that comprises a second average axial position over a second azimuthal span and a second weld composition formed of a greater proportion of the turbine wheel material than the shaft material,
wherein a sum of the first azimuthal span and the second azimuthal span is approximately 360 degrees,
wherein the first average axial position differs from the second average axial position, and
wherein the first weld composition differs from the second weld composition.

12. The turbocharger of claim 11 wherein the first weld comprises a first axial width of a shank portion of 0.4 mm or less and wherein the second weld comprises a second axial width of a shank portion of 0.4 mm or less.

13. The turbocharger of claim 11 wherein the unit comprises a run-out of less than 200 microns.

14. The turbocharger of claim 11 wherein the turbine wheel material comprises nickel.

15. The turbocharger of claim 11 wherein the turbine wheel portion comprises a bore.

16. The turbocharger of claim 11 wherein the shaft portion comprises a spigot.

17. The turbocharger of claim 11 wherein the shaft portion comprises a piloting spigot and the turbine wheel portion comprises a piloting bore.

18. The turbocharger of claim 17 wherein a radial clearance exists between the piloting spigot and the piloting bore.

19. The turbocharger of claim 11 wherein the shaft portion is without a piloting spigot and the turbine wheel portion is without a piloting bore.

20. The turbocharger of claim 11 wherein the first azimuthal span is approximately 180 degrees and wherein the second azimuthal span is approximately 180 degrees.

Assignees

• Honeywell Int Inc

Inventors

• Zollinger Brent
• Barbone Maurizio
• Horlaville Didier
• Minculescu Andrei
• Vazeille Nicolas

Classifications

• F05D2230/234

  Laser welding · CPC title

• B23K26/28

  of curved planar seams · CPC title

• B23K26/0673

  into independently operating sub-beams, e.g. beam multiplexing to provide laser beams for several stations · CPC title

• B23K26/0604 Primary

  by a combination of beams · CPC title

• B23K26/034

  Observing the temperature of the workpiece · CPC title