Turbine wheel and method for the production thereof

Patent metadata

Field	Value
Publication number	US-9500081-B2
Application number	US-201113577097-A
Country	US
Kind code	B2
Filing date	Feb 7, 2011
Priority date	Feb 19, 2010
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

The invention relates to a turbine wheel ( 1 ) composed of a turbine wheel blank ( 2 ), having a turbine wheel back ( 3 ) and having a weld peg (Z) which is arranged on the turbine wheel back ( 3 ) via a transition region ( 5 ) provided with an undercut ( 4 ), wherein the undercut ( 4 ) is already provided in the turbine wheel blank ( 2 ).

First claim

The invention claimed is:

1. A turbine wheel blank ( 2 ) for machining to form a turbine wheel, the turbine wheel blank ( 2 ) having:
a turbine wheel back ( 3 ); and
a cup-shaped weld peg (Z) which is arranged on the turbine wheel back ( 3 ), the cup-shaped weld peg having
a cylindrical outer surface having an outer diameter,
an axial end face for mating to an axial end face of a shaft,
a smooth-walled cylindrical axial recess, and
a transition region ( 5 ) of radially reduced outer diameter provided between the turbine wheel back ( 3 ) and the cylindrical outer surface and forming an undercut ( 4 ).

2. A method for producing a turbine wheel ( 1 ), having the following method steps:
casting a turbine wheel blank ( 2 ) having a turbine wheel back ( 3 ) and a cup-shaped weld peg (Z) which is integrally formed on the turbine wheel back ( 3 ), the cup-shaped weld peg having
a cylindrical outer surface having an outer diameter,
an end face for mating to a shaft,
a cylindrical axial recess,
a curved transition region ( 5 ) of radially reduced diameter provided between the turbine wheel back ( 3 ) and the cylindrical outer surface and forming an undercut ( 4 ) in the transition region ( 5 ), and wherein the cylindrical outer surface of the cup-shaped cast weld peg (Z) of the turbine wheel blank ( 2 ) has a cast diameter greater than the diameter of the curved transition region of radially reduced diameter; and

machining the generally cylindrical surface of the cast weld peg along a grinding zone to reduce the outer diameter of the cylindrical outer surface of the weld peg to a final weld peg diameter approximately the minimum diameter of the curved transition region.

3. The method as claimed in claim 2 , wherein a precision casting process is used as a casting process.

4. The method as claimed in claim 2 , wherein the weld peg ( 4 ) is machined mechanically in a region ( 6 ) which ends before the undercut ( 4 ).

5. The method as claimed in claim 4 , wherein a grinding process or a turning process is used as a production process.

6. A turbine wheel blank ( 2 ) for machining to form a turbine wheel, the turbine wheel blank ( 2 ) having:
a turbine wheel back ( 3 ); and
a cup-shaped weld peg (Z) which is arranged on the turbine wheel back ( 3 ), the cup-shaped weld peg having
a cylindrical outer surface having an outer diameter,
an axial end face adapted for mating to a shaft by friction welding or electron beam welding,
a smooth-walled cylindrical axial recess, and
a transition region ( 5 ) of radially reduced outer diameter provided between the turbine wheel back ( 3 ) and the cylindrical outer surface and forming an undercut ( 4 ).

Assignees

• Koenig Igor
• Scholz Georg
• Borgwarner Inc

Inventors

• Koenig Igor
• Scholz Georg

Classifications

• F05D2220/40

  in turbochargers · CPC title

• Y10T29/4932

  Turbomachine making · CPC title

• F05D2230/21

  by casting · CPC title

• B22C9/04

  Use of lost patterns · CPC title

• F01D5/04

  for radial-flow machines or engines · CPC title