US20080008595A1 - Compressor wheel - Google Patents
Compressor wheel Download PDFInfo
- Publication number
- US20080008595A1 US20080008595A1 US11/803,206 US80320607A US2008008595A1 US 20080008595 A1 US20080008595 A1 US 20080008595A1 US 80320607 A US80320607 A US 80320607A US 2008008595 A1 US2008008595 A1 US 2008008595A1
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- United States
- Prior art keywords
- compressor wheel
- backface
- layer
- compressive stress
- residual compressive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/08—Modifying the physical properties of iron or steel by deformation by cold working of the surface by burnishing or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/4932—Turbomachine making
- Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member
Definitions
- This invention relates generally to compressor wheels or impellers as may be used in a turbocharger, supercharger, and the like.
- Locomotives equipped with internal combustion engines may require relatively high air flow rates and high manifold pressures, as may be provided by a turbocharger, to meet air quality targets while maximizing fuel economy and reliability.
- the high boost ratios typically 3.8 or higher, may require high tip speeds on a turbocharger compressor wheel, which may lead to high levels of tensile stress in a bore area and shortened wheel life due to low cycle fatigue.
- compressor wheels have used a through bore that extends through the center of the wheel along a rotation axis, and where the wheel may be securely mounted onto a shaft with a locking nut.
- so called boreless compressor wheels are able to rotate at higher speeds than compressor wheels having a through bore since a through bore removes load carrying material and thereby increases the stress level in the remaining material. That is, more wheel material exists at a point of maximum centrifugal load that results in higher load carrying capability.
- a threaded counterbore is provided in a hub extension for receiving the shaft.
- the counterbore must terminate well short of the plane indicative of typical maximum stress to avoid the high level of stress at that location. Since the length of the shaft/threaded interface is generally constant for any given application, the foregoing arrangement (that causes the designer to position such an interface away from the high stress plane) may result in excessive overhang of the compressor wheel. This detrimentally affects rotor dynamics and increases the axial length of the hub extension, thus increasing the overall footprint of the compressor wheel and turbocharger.
- aspects of the present invention propose to improve compressor life by using a hub with a counterbore including a base surface treated to impart residual compressive stresses for enhanced endurance to stress-induced fatigue.
- the surface treatment allows extending the counterbore relatively closer to a plane indicative of typical maximum stress. This design flexibility advantageously allows avoiding or reducing overhang of the compressor wheel, thereby improving rotor dynamics and reducing the axial length of the hub, and the overall foot print of the compressor wheel and turbocharger.
- the present invention fulfills the foregoing needs by providing in one aspect thereof, a method of manufacturing a compressor wheel.
- the method allows providing a hub extension of the compressor wheel that defines a counterbore.
- the method further allows imparting residual compressive stresses to a base surface of the counterbore.
- the present invention further fulfills the foregoing needs by providing a compressor wheel comprising a hub including a hub extension that defines a counterbore.
- the counterbore includes a base surface and the base surface of the counterbore is treated to impart residual compressive stresses thereto.
- FIG. 1 illustrates a cutaway view of an exemplary turbocharger that may benefit from the teachings of the present invention.
- FIG. 2 shows a cross-sectional view of an exemplary compressor wheel embodying aspects of the present invention.
- FIG. 3 shows configurational details regarding the compressor wheel of FIG. 2 that allow positioning a mounting counterbore relatively closer to a plane indicative of typical maximum stress of the wheel.
- FIG. 4 shows a rotatable shaft assembled into a counterbore embodying aspects of the present invention.
- FIG. 1 shows a cutaway view of an exemplary turbocharger ( 10 ) that may benefit from the teachings of the present invention.
- Turbocharger ( 10 ) generally comprises respective compressor and turbine stages ( 12 ) and ( 14 ) including a compressor wheel ( 16 ) and a turbine wheel ( 18 ) coupled through a rotatable shaft ( 20 ).
- the turbine wheel ( 18 ) is disposed within a turbine housing, which includes an inlet for receiving exhaust gases from an internal combustion engine (not shown).
- the turbine housing guides the engine exhaust gases for communication with and expansion through the turbine wheel ( 18 ) for rotatably driving the turbine wheel.
- the turbine wheel rotatably drives the shaft ( 20 ) and compressor wheel ( 16 ), as may be disposed within a compressor housing.
- the compressor wheel ( 16 ) and housing allow drawing in and compressing ambient air for supply to the intake of the engine.
- Compressor wheel ( 16 ) includes a hub portion ( 21 ).
- the hub portion ( 21 ) defines a front face surface ( 22 ) for the compressor wheel ( 16 ), and supports a plurality of circumferentially spaced apart compressor blades ( 23 ) (only two of which are visible in FIG. 2 ) extending both radially outwardly and axially thereon.
- the hub portion ( 21 ) also includes a radially enlarged disc-like portion ( 24 ) which serves to support the compressor blades ( 23 ) as well as to define a floor surface ( 25 ) for the air flow channels defined between blades ( 23 ).
- the disc-like portion ( 24 ) also defines a radially outer circumferential surface ( 26 ) for hub ( 21 ), as well as an axially disposed back side or back face surface ( 27 ).
- a plane indicative of typical maximum stress ( 30 ) typically exists substantially in axial alignment with the maximum radial extent of the hub ( 21 ). That is, the plane of maximum stress ( 30 ) is typically coincident with surface 26 and reaches a maximum at the point where the rotation axis ( 34 ) transects plane ( 30 ), approximately at point ( 31 ).
- compressor wheel ( 16 ) includes a hub extension ( 38 ) integrally defined by hub ( 21 ) and extending axially away from plane ( 30 ).
- Hub extension ( 38 ) defines an axially extending counterbore ( 36 ).
- the inventors of the present invention have innovatively recognized that one may advantageously improve rotor dynamics as well as reduce the axial length of the compressor wheel when a base surface ( 40 ) of counterbore ( 36 ) is treated to impart residual compressive stresses to such a base surface.
- techniques such as cold working techniques, that may be used to treat the counterbore base surface may comprise shot peening, laser peening, glass beading, roll burnishing, etc.
- Cold working provides plastic deformation of a metal (e.g., aluminum) below its annealing temperature to cause permanent strain hardening.
- Peening means to compress a portion of a surface by forming a depression or indentation on the surface.
- Peening equipment generally is utilized to create a compressively stressed protection layer at the outer surface of a workpiece.
- the protection layer considerably increases the resistance of the workpiece to fatigue failure.
- a shot used in shot peening may comprise spherical particles constructed from a hard metal or any other suitable material. With shot peening systems, a stream of shot particles traveling at a high velocity is directed at an outer surface of a workpiece, e.g., the base of the counterbore. Each shot particle that impacts with sufficient force upon the outer surface of the workpiece causes plastic deformation of the surface and a dimple is formed therein. In this manner, a compressively stressed layer is formed at the outer surface of the workpiece to increase fatigue strength of the workpiece.
- a laser beam from a laser beam source is used to produce a strong localized compressive force on a surface.
- Laser peening may be utilized in lieu of shot peening to create a compressively stressed protection layer at the outer surface of a workpiece. This type of treatment also considerably increases the resistance of the workpiece to fatigue failure. Thus, peening is typically a very effective means for producing surface compression residual stress, and therefore, prolonging the useful life of the workpiece.
- the surface treatment of the base of the counterbore allows extending the base surface ( 40 ) of counterbore ( 36 ) relatively closer to the plane ( 30 ) indicative of typical maximum stress.
- This is exemplarily illustrated in FIG. 3 by the representation of the counterbore base ( 40 ′) relative to the representation of the counterbore base ( 40 ).
- This design flexibility advantageously allows avoiding or reducing overhang of the compressor wheel, thereby improving rotor dynamics and reducing the axial length of the hub extension, and the overall foot print of the compressor wheel and turbocharger.
- the base ( 40 ) of counterbore ( 36 ) is configured to extend a distance L towards plane ( 30 )
- this would allow reducing the axial length of the hub extension ( 38 ) by distance L.
- counterbore ( 36 ) includes alignment pilots ( 42 ) disposed to facilitate the centering of the shaft ( 20 ) received in counterbore ( 36 ). That is, alignment pilots ( 42 ) are configured to minimize eccentricity of shaft ( 20 ) relative to the walls of the counterbore.
- the compressor wheel, shaft, and thrust collar ( 44 ) may rotate relative to a bearing configured to provide radial support to the rotating structures.
Abstract
Compressor wheel (16) and techniques for manufacturing such a wheel are provided. The wheel may include a hub (21) with a counterbore (36) internally treated to impart residual compressive stresses, for enhanced endurance to stress-induced fatigue. The surface treatment allows extending the counterbore relatively closer to a plane (30) of typical maximum stress of the wheel. This design flexibility advantageously allows avoiding or reducing overhang of the compressor wheel, thereby improving rotor dynamics and reducing the axial length of the hub, and the overall foot print of the compressor wheel.
Description
- This invention relates generally to compressor wheels or impellers as may be used in a turbocharger, supercharger, and the like.
- Locomotives equipped with internal combustion engines, e.g., diesel engines, designed to meet stringent emissions regulations may require relatively high air flow rates and high manifold pressures, as may be provided by a turbocharger, to meet air quality targets while maximizing fuel economy and reliability. The high boost ratios, typically 3.8 or higher, may require high tip speeds on a turbocharger compressor wheel, which may lead to high levels of tensile stress in a bore area and shortened wheel life due to low cycle fatigue. It is known that compressor wheels have used a through bore that extends through the center of the wheel along a rotation axis, and where the wheel may be securely mounted onto a shaft with a locking nut.
- It is further known that so called boreless compressor wheels are able to rotate at higher speeds than compressor wheels having a through bore since a through bore removes load carrying material and thereby increases the stress level in the remaining material. That is, more wheel material exists at a point of maximum centrifugal load that results in higher load carrying capability.
- In one known compressor wheel, a hub section of the compressor wheel that axially corresponds with the radially outermost portion of the wheel experiences the maximum centrifugal load. That is, a plane indicative of typical maximum stress exists in substantial axial alignment with the maximum radial extent of the hub. In this known compressor wheel, a threaded counterbore is provided in a hub extension for receiving the shaft. However, the counterbore must terminate well short of the plane indicative of typical maximum stress to avoid the high level of stress at that location. Since the length of the shaft/threaded interface is generally constant for any given application, the foregoing arrangement (that causes the designer to position such an interface away from the high stress plane) may result in excessive overhang of the compressor wheel. This detrimentally affects rotor dynamics and increases the axial length of the hub extension, thus increasing the overall footprint of the compressor wheel and turbocharger.
- Aspects of the present invention propose to improve compressor life by using a hub with a counterbore including a base surface treated to impart residual compressive stresses for enhanced endurance to stress-induced fatigue. The surface treatment allows extending the counterbore relatively closer to a plane indicative of typical maximum stress. This design flexibility advantageously allows avoiding or reducing overhang of the compressor wheel, thereby improving rotor dynamics and reducing the axial length of the hub, and the overall foot print of the compressor wheel and turbocharger.
- Generally, the present invention fulfills the foregoing needs by providing in one aspect thereof, a method of manufacturing a compressor wheel. The method allows providing a hub extension of the compressor wheel that defines a counterbore. The method further allows imparting residual compressive stresses to a base surface of the counterbore.
- In another aspect thereof, the present invention further fulfills the foregoing needs by providing a compressor wheel comprising a hub including a hub extension that defines a counterbore. The counterbore includes a base surface and the base surface of the counterbore is treated to impart residual compressive stresses thereto.
- The features and advantages of the present invention will become apparent from the following detailed description of the invention when read with the accompanying drawings in which:
-
FIG. 1 illustrates a cutaway view of an exemplary turbocharger that may benefit from the teachings of the present invention. -
FIG. 2 shows a cross-sectional view of an exemplary compressor wheel embodying aspects of the present invention. -
FIG. 3 shows configurational details regarding the compressor wheel ofFIG. 2 that allow positioning a mounting counterbore relatively closer to a plane indicative of typical maximum stress of the wheel. -
FIG. 4 shows a rotatable shaft assembled into a counterbore embodying aspects of the present invention. -
FIG. 1 shows a cutaway view of an exemplary turbocharger (10) that may benefit from the teachings of the present invention. Turbocharger (10) generally comprises respective compressor and turbine stages (12) and (14) including a compressor wheel (16) and a turbine wheel (18) coupled through a rotatable shaft (20). The turbine wheel (18) is disposed within a turbine housing, which includes an inlet for receiving exhaust gases from an internal combustion engine (not shown). The turbine housing guides the engine exhaust gases for communication with and expansion through the turbine wheel (18) for rotatably driving the turbine wheel. Simultaneously, the turbine wheel rotatably drives the shaft (20) and compressor wheel (16), as may be disposed within a compressor housing. The compressor wheel (16) and housing allow drawing in and compressing ambient air for supply to the intake of the engine. - Referring to
FIG. 2 , a cross-sectional view of an exemplary embodiment of the compressor wheel (16) is shown. Compressor wheel (16) includes a hub portion (21). The hub portion (21) defines a front face surface (22) for the compressor wheel (16), and supports a plurality of circumferentially spaced apart compressor blades (23) (only two of which are visible inFIG. 2 ) extending both radially outwardly and axially thereon. The hub portion (21) also includes a radially enlarged disc-like portion (24) which serves to support the compressor blades (23) as well as to define a floor surface (25) for the air flow channels defined between blades (23). The disc-like portion (24) also defines a radially outer circumferential surface (26) for hub (21), as well as an axially disposed back side or back face surface (27). - As will be recognized by those skilled in the pertinent art, in operation of compressor wheel (16), a plane indicative of typical maximum stress (30) typically exists substantially in axial alignment with the maximum radial extent of the hub (21). That is, the plane of maximum stress (30) is typically coincident with
surface 26 and reaches a maximum at the point where the rotation axis (34) transects plane (30), approximately at point (31). - To avoid the undesirable stress concentration of a conventional through bore and preserve the strength of solid metal adjacent to point (31), compressor wheel (16) includes a hub extension (38) integrally defined by hub (21) and extending axially away from plane (30). Hub extension (38) defines an axially extending counterbore (36).
- The inventors of the present invention have innovatively recognized that one may advantageously improve rotor dynamics as well as reduce the axial length of the compressor wheel when a base surface (40) of counterbore (36) is treated to impart residual compressive stresses to such a base surface. Examples of techniques, such as cold working techniques, that may be used to treat the counterbore base surface may comprise shot peening, laser peening, glass beading, roll burnishing, etc. Cold working provides plastic deformation of a metal (e.g., aluminum) below its annealing temperature to cause permanent strain hardening.
- Peening, as understood in the art and as used herein, means to compress a portion of a surface by forming a depression or indentation on the surface. Peening equipment generally is utilized to create a compressively stressed protection layer at the outer surface of a workpiece. The protection layer considerably increases the resistance of the workpiece to fatigue failure. A shot used in shot peening may comprise spherical particles constructed from a hard metal or any other suitable material. With shot peening systems, a stream of shot particles traveling at a high velocity is directed at an outer surface of a workpiece, e.g., the base of the counterbore. Each shot particle that impacts with sufficient force upon the outer surface of the workpiece causes plastic deformation of the surface and a dimple is formed therein. In this manner, a compressively stressed layer is formed at the outer surface of the workpiece to increase fatigue strength of the workpiece.
- In laser peening, a laser beam from a laser beam source is used to produce a strong localized compressive force on a surface. Laser peening may be utilized in lieu of shot peening to create a compressively stressed protection layer at the outer surface of a workpiece. This type of treatment also considerably increases the resistance of the workpiece to fatigue failure. Thus, peening is typically a very effective means for producing surface compression residual stress, and therefore, prolonging the useful life of the workpiece.
- As shown in
FIG. 3 , the surface treatment of the base of the counterbore allows extending the base surface (40) of counterbore (36) relatively closer to the plane (30) indicative of typical maximum stress. This is exemplarily illustrated inFIG. 3 by the representation of the counterbore base (40′) relative to the representation of the counterbore base (40). This design flexibility advantageously allows avoiding or reducing overhang of the compressor wheel, thereby improving rotor dynamics and reducing the axial length of the hub extension, and the overall foot print of the compressor wheel and turbocharger. For example, assuming the base (40) of counterbore (36) is configured to extend a distance L towards plane (30), this would allow reducing the axial length of the hub extension (38) by distance L. - In yet another aspect of the invention, as may be appreciated in
FIG. 4 , the extended base (40) of the counterbore allows deeper penetration of shaft (20) relative to the plane (30) of typical maximum tensile stress, thereby reducing axial overhang of the compressor wheel. In one exemplary embodiment, counterbore (36) includes alignment pilots (42) disposed to facilitate the centering of the shaft (20) received in counterbore (36). That is, alignment pilots (42) are configured to minimize eccentricity of shaft (20) relative to the walls of the counterbore. As will be appreciated by those skilled in the art, the compressor wheel, shaft, and thrust collar (44) may rotate relative to a bearing configured to provide radial support to the rotating structures. - While the preferred embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions will occur to those of skill in the art without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.
Claims (31)
1. A compressor wheel, the compressor wheel having an axis of rotation and comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein at least a portion of the backface is provided with a layer of residual compressive stress extending to a depth below the surface of the backface.
2. A compressor wheel according to claim 1 , wherein said backface portion is annular.
3. A compressor wheel according to claim 2 , wherein said backface portion extends radially from the axis of the compressor wheel.
4. A compressor wheel according to claim 1 , wherein said portion of the surface of the backface is a substantial portion of the surface of the backface.
5. A compressor wheel according to claim 4 , wherein the entire surface of the backface is provided with said layer of residual compressive stress.
6. A compressor wheel according to claim 1 , wherein the layer of residual compressive stress has a maximum depth of at least 300 μm.
7. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a minimum depth of 300 μm.
8. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a maximum depth of at least 500 μm.
9. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a minimum depth of at least 500 μm.
10. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a maximum depth of at least 800 μm.
11. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a minimum depth of at least 800 μm.
12. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a maximum depth of at least 1 mm.
13. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress has a minimum depth of at least 1 mm.
14. A compressor wheel according to claim 1 , wherein the depth of the layer of residual compressive stress varies across said portion of the surface of the backface.
15. A compressor wheel according to claim 14 , wherein said depth is minimised in regions of said portion of the backface susceptible to deformation under compressive forces required to produce said layer of compressive stress.
16. A compressor wheel according to claim 1 , wherein said layer of residual compressive stress is induced by applying a cold working technique to said portion of the backface.
17. A compressor wheel according to claim 16 , wherein said cold working technique comprises roller burnishing.
18. A compressor wheel assembly comprising:
a compressor wheel having an axis of rotation and comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein at least a portion of the backface is provided with a layer of residual compressive stress extending to a depth below the surface of the backface.
19. A compressor wheel assembly according to claim 18 , wherein a second member is mounted to the shaft for rotation therewith in abutment with a region of the wheel backface, and wherein said portion of the wheel comprising said layer of residual compressive stress includes at least said region.
20. A compressor wheel assembly according to claim 19 , wherein said second member comprises an oil control device such as an oil slinger.
21. A compressor wheel assembly according to claim 19 , wherein said second member comprises a component of a thrust bearing assembly mounted on said shaft.
22. A compressor wheel assembly according to claim 18 , wherein the compressor wheel is welded to said shaft, a transition region being formed between the backface and shaft in the region of said weld, said transition region being provided with said layer of compressive residual stress.
23. A compressor wheel assembly according to claim 22 , wherein said transition region comprises a fillet radii.
24. A compressor wheel assembly, comprising a compressor wheel welded to a shaft for rotation about an axis, the compressor wheel comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein a transition region is defined between the backface and shaft in the region of said weld, said transition region being provided with a layer of residual compressive stress extending the depth below the surface of the backface.
25. A turbocharger comprising a compressor wheel having an axis of rotation and comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein at least a portion of the backface is provided with a layer of residual compressive stress extending to a depth below the surface of the backface.
26. A method of manufacturing a compressor wheel to provide increased resistance to critical failure, the compressor wheel having an axis of rotation and comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein at least a portion of the backface is treated to form a layer of residual compressive stress extending to a depth below the surface of the backface.
27. A method according to claim 26 , wherein said treatment comprises applying a cold working technique to said portion of the backface.
28. A method according to claim 27 , wherein said cold working technique comprises roller burnishing.
29. (canceled)
30. A turbocharger comprising a compressor wheel welded to a shaft for rotation about an axis, the compressor wheel comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein a transition region is defined between the backface and shaft in the region of said weld, said transition region being provided with a layer of residual compressive stress extending the depth below the surface of the backface.
31. A method of manufacturing a compressor wheel assembly comprising:
welding a compressor wheel to a shaft for rotation about an axis, the compressor wheel comprising a plurality of blades extending generally radially away from said axis and generally axially from one face of a disc-like support, the opposite face of the support defining a wheel backface, wherein a transition region is defined between the backface and shaft in the region of said weld; and
treating said transition region to form a layer of residual compressive stress extending the depth below the surface of the backface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/731,741 US8641380B2 (en) | 2004-11-13 | 2010-03-25 | Compressor wheel |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GB0425088A GB0425088D0 (en) | 2004-11-13 | 2004-11-13 | Compressor wheel |
GBGB0425088.2 | 2004-11-13 | ||
PCT/GB2005/004316 WO2006051285A1 (en) | 2004-11-13 | 2005-11-09 | Compressor wheel |
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PCT/GB2005/004316 Continuation WO2006051285A1 (en) | 2004-11-13 | 2005-11-09 | Compressor wheel |
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US12/731,741 Continuation US8641380B2 (en) | 2004-11-13 | 2010-03-25 | Compressor wheel |
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US20080008595A1 true US20080008595A1 (en) | 2008-01-10 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/803,206 Abandoned US20080008595A1 (en) | 2004-11-13 | 2007-05-14 | Compressor wheel |
US12/731,741 Expired - Fee Related US8641380B2 (en) | 2004-11-13 | 2010-03-25 | Compressor wheel |
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Application Number | Title | Priority Date | Filing Date |
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US12/731,741 Expired - Fee Related US8641380B2 (en) | 2004-11-13 | 2010-03-25 | Compressor wheel |
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US (2) | US20080008595A1 (en) |
EP (1) | EP1809907B1 (en) |
JP (1) | JP2008519933A (en) |
KR (1) | KR20070084157A (en) |
CN (1) | CN101057078B (en) |
DE (1) | DE602005019456D1 (en) |
GB (1) | GB0425088D0 (en) |
WO (1) | WO2006051285A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100104457A1 (en) * | 2008-10-25 | 2010-04-29 | Bosch Mahle Turbo Systems Gmbh & Co.Kg | Turbocharger |
US20150204331A1 (en) * | 2014-01-17 | 2015-07-23 | Borgwarner Inc. | Method for connecting a compressor wheel to a shaft of a supercharging device |
US20160122536A1 (en) * | 2014-10-31 | 2016-05-05 | Hyundai Motor Company | Chemical resistant polymer resin composition for vehicle overhead console |
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Also Published As
Publication number | Publication date |
---|---|
EP1809907A1 (en) | 2007-07-25 |
CN101057078A (en) | 2007-10-17 |
US20100319344A1 (en) | 2010-12-23 |
EP1809907B1 (en) | 2010-02-17 |
DE602005019456D1 (en) | 2010-04-01 |
WO2006051285A1 (en) | 2006-05-18 |
KR20070084157A (en) | 2007-08-24 |
US8641380B2 (en) | 2014-02-04 |
GB0425088D0 (en) | 2004-12-15 |
JP2008519933A (en) | 2008-06-12 |
CN101057078B (en) | 2012-02-22 |
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