The invention relates to a flow rotor, in particular a turbine wheel.
A flow rotor of this kind, which is formed in particular as a turbine wheel of an exhaust-gas turbocharger, has a wheel hub having a core, on the outside of which there is arranged an outer part with guide blades. In the case of the turbine wheel of the generic type, the wheel core and the outer part consist of the same material, such that a homogeneous turbine wheel is formed.
By way of contrast, it is an object of the present invention to provide a flow rotor, in particular a turbine wheel, of the type indicated in the preamble of claim 1 which has an improved moment of inertia and a reduced mass.
By virtue of the fact that the wheel core and the outer part are constructed from different materials, it is possible, by a suitable material selection, to reduce the weight of the wheel core, such that as a whole the moment of inertia of the flow rotor or turbine wheel according to the invention is improved and the mass thereof is reduced.
The dependent claims contain advantageous developments of the inventions.
Further details, features and advantages of the invention become apparent from the following description of exemplary embodiments with reference to the drawing, in which:
The turbine wheel 1 has a wheel core 2 which, in the example, has a bell-like cross section. The outer face 8 of the wheel core 2 is provided with an outer part 3, which is provided with a plurality of blades, of which one blade 7 is provided with a reference number in the sectional illustration. According to the invention, the wheel core 2 is produced from a different material than the outer part 3. To improve the moment of inertia and to reduce the mass, the material of the outer part 3 has a lower density than the material of the wheel core 2. To connect the wheel core 2 and the outer part 3, the outer face 8 of the wheel core 2 may be provided with a suitable coating, in order to make it possible to achieve a better connection between the wheel core 2 and the outer part 3. Furthermore, as is evident from the illustration in
To connect the wheel core 2 and the outer part 3, it is possible, for example, to weld these to one another or to connect them to one another in a composite casting process.
An example of welding is shown in the embodiment according to
To connect the wheel core 2 and the outer part 3, the weld pin 6 is inserted into the longitudinal center recess 5 and then welded to the outer part 3.
An example of the material of the wheel core 2 is a nickel-based alloy.
The material of the outer part 3 and of the weld pin 6 may be titanium aluminide or ceramic.
In addition to the welding and composite casting connection processes mentioned above, other common connection processes are, of course, also conceivable.
In addition to the written disclosure of the invention above, reference is hereby made explicitly to the diagrammatic illustration thereof in
1 Flow rotor, in particular turbine wheel
2 Wheel core/boss
3 Outer part/outer skin
4 Form-fitting connection device
5 Longitudinal center recess/longitudinal bore
6 Weld pin
7 Guide blade
8 Outer face of the wheel core 2
L Longitudinal center axis
Number | Date | Country | Kind |
---|---|---|---|
10 2011 118 601 | Nov 2011 | DE | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/US2012/064290 | 11/9/2012 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2013/074393 | 5/23/2013 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
4257744 | Watson | Mar 1981 | A |
4494287 | Cruzen | Jan 1985 | A |
4581300 | Hoppin, III | Apr 1986 | A |
4721394 | Casto | Jan 1988 | A |
4735556 | Fujikake | Apr 1988 | A |
4907947 | Hoppin, III | Mar 1990 | A |
5931186 | Skoglund | Aug 1999 | A |
6056856 | Graf | May 2000 | A |
6190033 | Rickman | Feb 2001 | B1 |
6291086 | Nguyen-Dinh | Sep 2001 | B1 |
6551064 | Mannava | Apr 2003 | B1 |
6635362 | Zheng | Oct 2003 | B2 |
7000306 | Rice | Feb 2006 | B2 |
7241416 | Sweetland | Jul 2007 | B2 |
7481625 | Kim | Jan 2009 | B2 |
20020040581 | Finger | Apr 2002 | A1 |
20040202539 | Blank | Oct 2004 | A1 |
20060127244 | Frankenstein et al. | Jun 2006 | A1 |
20060222503 | Fledersbacher et al. | Oct 2006 | A1 |
20080219853 | Baker | Sep 2008 | A1 |
20120301307 | Yang | Nov 2012 | A1 |
20140308137 | Koenig | Oct 2014 | A1 |
Number | Date | Country |
---|---|---|
S 55-134701 | Oct 1980 | JP |
2011137379 | Jul 2011 | JP |
Entry |
---|
International Search Report in International Application No. PCT/US2012/064290, dated Mar. 28, 2013. |
Number | Date | Country | |
---|---|---|---|
20140308137 A1 | Oct 2014 | US |