Turbine wheel of an exhaust-gas turbocharger

Patent metadata

Field	Value
Publication number	US-10001012-B2
Application number	US-201414778742-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Apr 5, 2013
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A turbine wheel ( 1 ) of an exhaust-gas turbocharger ( 2 ), formed from a titanium aluminide material, having a wheel back ( 7 ) which is of closed configuration as viewed from an axial direction (A) and which has an outer contour ( 17 ), a hub ( 3 ) which extends from the wheel back ( 7 ) and which tapers along the axial direction (A), and a multiplicity of turbine blades ( 4 ) which extend from the wheel back ( 7 ) and from the hub ( 3 ) and which blades extend outward in a radial direction (R), as far as a connection region outer diameter (DAB) at least in a connection region ( 5 ). The wheel back ( 7 ) has, in an outer region ( 11 ) adjoining the connection region ( 5 ), a wheel back outer diameter (DRR) which is greater than or equal to the connection region outer diameter (DAB).

First claim

The invention claimed is:

1. A turbine wheel ( 1 ) of an exhaust-gas turbocharger ( 2 ), formed from a titanium aluminide material, having
a wheel back ( 7 ) which is of closed configuration as viewed from an axial direction (A) and which has an outer contour ( 17 ),
a hub ( 3 ) which extends from the wheel back ( 7 ) and which tapers along the axial direction (A), and
a multiplicity of turbine blades ( 4 ) which extend from the wheel back ( 7 ) and from the hub ( 3 ) and which extend outward in a radial direction (R), as far as a connection region outer diameter (DAB) at least in a connection region ( 5 ),
the wheel back ( 7 ) having, in an outer region ( 11 ) adjoining the connection region ( 5 ), a wheel back outer diameter (DRR) which is greater than or equal to the connection region outer diameter (DAB),
wherein the wheel back ( 7 ) has, at least adjacent to the connection region ( 5 ), a wall thickness (WRR) which is in a ratio of 1.5:1 to 2.5:1 with respect to a wall thickness (WTS) of the turbine blade ( 4 ).

2. The turbine wheel as claimed in claim 1 , wherein a wheel hub region ( 8 ) extending in the axial direction (A) merges in continuous fashion, in a chamfer region ( 9 ) with radially outwardly increasing connection radii (AR(R)), into an intermediate region ( 10 ), extending in the radial direction (R), of the wheel back ( 7 ).

3. The turbine wheel as claimed in claim 1 , wherein the turbine wheel is a forged and milled turbine wheel.

4. The turbine wheel as claimed in claim 1 , wherein the turbine wheel is a cast turbine wheel.

5. The turbine wheel as claimed in claim 1 , wherein the turbine wheel is adapted to being driven by an exhaust-gas stream flowing inward in the radial direction (R).

6. The turbine wheel as claimed in claim 1 , wherein the turbine wheel is adapted to being driven by an exhaust-gas stream flowing obliquely both in the radial direction (R) and also in the axial direction (A).

7. An exhaust-gas turbocharger ( 2 ) for the supercharging of an internal combustion engine, having a turbine wheel ( 1 ) as claimed in claim 1 .

8. The turbine wheel as claimed in claim 1 , wherein the wheel back ( 7 ) has, at least adjacent to the connection region ( 5 ), a wall thickness (WRR) which is in a ratio of 1.7:1 to 2.3:1 with respect to a wall thickness (WTS) of the turbine blade ( 4 ).

9. The turbine wheel as claimed in claim 1 , wherein the wheel back ( 7 ) has, at least adjacent to the connection region ( 5 ), a wall thickness (WRR) which is in a ratio of 1.8:1 to 2.2:1 with respect to a wall thickness (WTS) of the turbine blade ( 4 ).

10. The turbine wheel as claimed in claim 1 , wherein a ratio of the wall thickness (WTS) of the turbine blades ( 4 ) to the connection region outer diameter (DAB) lies in the range of between 0.3:40 and 0.5:40.

11. The turbine wheel as claimed in claim 1 , wherein a ratio of the wall thickness (WTS) of the turbine blades ( 4 ) to the connection region outer diameter (DAB) lies in the range of between between 0.35:40 and 0.45:40.

12. A turbine wheel ( 1 ) of an exhaust-gas turbocharger ( 2 ), formed from a titanium aluminide material, having
a wheel back ( 7 ) which is of closed configuration as viewed from an axial direction (A) and which has an outer contour ( 17 ),
a hub ( 3 ) which extends from the wheel back ( 7 ) and which tapers along the axial direction (A), and
a multiplicity of turbine blades ( 4 ) which extend from the wheel back ( 7 ) and from the hub ( 3 ) and which extend outward in a radial direction (R), as far as a connection region outer diameter (DAB) at least in a connection region ( 5 ),
the wheel back ( 7 ) having, in an outer region ( 11 ) adjoining the connection region ( 5 ), a wheel back outer diameter (DRR) which is greater than or equal to the connection region outer diameter (DAB),

wherein a ratio of the wall thickness (WTS) of the turbine blades ( 4 ) to the connection region outer diameter (DAB) lies in the range of between 0.3:40 and 0.7:40.

13. The turbine wheel as claimed in claim 12 , wherein a wheel hub region ( 8 ) extending in the axial direction (A) merges in continuous fashion, in a chamfer region ( 9 ) with radially outwardly increasing connection radii (AR(R)), into an intermediate region ( 10 ), extending in the radial direction (R), of the wheel back ( 7 ).

14. A turbine wheel ( 1 ) of an exhaust-gas turbocharger ( 2 ), formed from a titanium aluminide material, having
a wheel back ( 7 ) which is of closed configuration as viewed from an axial direction (A) and which has an outer contour ( 17 ),
a hub ( 3 ) which extends from the wheel back ( 7 ) and which tapers along the axial direction (A), and
a multiplicity of turbine blades ( 4 ) which extend from the wheel back ( 7 ) and from the hub ( 3 ) and which extend outward in a radial direction (R), as far as a connection region outer diameter (DAB) at least in a connection region ( 5 ),
the wheel back ( 7 ) having, in an outer region ( 11 ) adjoining the connection region ( 5 ), a wheel back outer diameter (DRR) which is greater than or equal to the connection region outer diameter (DAB),
wherein the wheel back ( 7 ) has, at least adjacent to the connection region ( 5 ), a wall thickness (WRR) which is in a ratio of 1.5:1 to 2.5:1 with respect to a wall thickness (WTS) of the turbine blade ( 4 ), and
wherein a ratio of the wall thickness (WTS) of the turbine blades ( 4 ) to the connection region outer diameter (DAB) lies in the range of the range of between 0.3:40 and 0.7:40.

Assignees

• Borgwarner Inc

Inventors

• Scherrer Frank
• Roder Menno
• Schall Gerald
• Strelbitski Juergen
• Loewenberg Michael
• Eisinger Stefan
• Adilovic Adnan
• Klein Achim

Classifications

• F02B37/00

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title

• F01D5/04 Primary

  for radial-flow machines or engines · CPC title

• F05D2230/10

  by removing material · CPC title

• F01D5/141 Primary

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title

• F05D2240/24

  for turbines · CPC title