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US 4,705,463 AGranted
Compressor wheel assembly for turbochargers
AssigneeThe Garrett Corporation
InventorFidel M. Joco
Life of this patent
Estimating the term…
Abstract
A compressor wheel assembly for turbochargers and the like comprises a compressor wheel including a boreless hub formed integrally as by casting with a circumferential array of aerodynamically contoured centrifugal impeller blades. The wheel hub is secured at its base by inertia welding to a thrust spacer sleeve having an internally threaded bore for threaded reception of a rotatable shaft. In use of the compressor wheel assembly, the absence of a bore within the wheel hub substantially improves wheel fatigue life.
Claims20
In a turbocharger having a housing:
- a rotatable shaft having a threaded end;
- bearing means for rotatably mounting said shaft to said housing;
- a boreless turbine wheel secured to an end of said shaft opposite said threaded end;
- a compressor wheel cast from a relatively low inertia material to include a boreless hub blending relatively smoothly in an axial direction between a diametrically enlarged backplate disk at one axial end end and a nose of reduced diameter at an opposite axial end, said hub integrally supporting a circumferentially arranged array of centrifugal impeller blades;
- and
- a generally cylindrical sleeve member formed from a relatively wear-resistant material in comparison with said compressor wheel, said sleeve member being secured at one axial end thereof to said one axial end of said compressor wheel in a position generally centered on a central axis of said wheel, said sleeve member further including a threaded inner diameter surface for threaded connection with said threaded end of the shaft.
3 more elements
In a turbocharger having a housing:
- a rotatable shaft having a threaded end;
- bearing means for rotatably mounting said shaft to said housing;
- a boreless turbine wheel secured to an end of said shaft opposite said threaded end;
- a boreless compressor wheel having a boreless hub supporting a circumferentially arranged array of impeller blades;
- and
- an attachment member mounted on said hub generally at one axial end thereof in a position generally centered on a central axis of said hub, said attachment member including means for attachment to said threaded end of the shaft.
3 more elements
A turbocharger comprising:
- a rotatable shaft having a threaded end;
- a shaft housing including bearing means for rotatably and axially supporting said shaft;
- a turbine housing secured to said shaft housing;
- a boreless turbine wheel attached to an end of said shaft opposite said threaded end;
- a compressor housing defining a fluid inlet and a fluid outlet;
- a compressor backplate wall separating said shaft housing and said compressor housing, said backplate wall having a shaft opening formed therein;
- and
- a compressor wheel assembly including a boreless compressor wheel having a boreless hub and a circumferentially arranged array of impeller blades;
- and
- a generally cylindrical sleeve member secured at one axial end thereof to one axial end of said compressor wheel, said sleeve member further including a threaded inner diameter surface for threaded connection with said shaft.
7 more elements
Dependencies are inferred from the claim text.