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US 4,850,802 AGranted
Composite compressor wheel for turbochargers
AssigneeAllied-Signal Inc.
InventorsAllan W. Pankratz, Bogumil J. Matysek, Ralph A. Mendelson
Life of this patent
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Abstract
A composite compressor wheel for turbochargers and the like comprises a cast shell having aerodynamically contoured centrifugal impeller blades and a hub section defining a generally conical recess into which a hub insert of noncast material resistant to stress failure is secured as by inertia welding. In use of the composite wheel, the hub insert substantially occupies high stress regions within the wheel to improve wheel fatigue life.
Claims28
A centrifugal compressor wheel for turbochargers and the like, comprising:
- a blade shell having a hub section formed integrally with a circumferentially arrranged array of centrifugal impeller blades and a generally conical recess formed in said hub section with a base diameter generally at one axial end of said shell and an apex disposed generally on a central axis of said shell;
- a hub insert having a size and shape generally for mating reception into the hub section recess and being secured to said shell with a substantially uninterrupted bond extending substantially over the entire conical interface between said hub insert and said shell, said hub insert being formed from a material relatively resistant to fatigue failure in comparison with said shell, and p1 a central axial bore formed through and bounded by said shell and said hub insert.
A centrifugal compressor wheel for turbochargers and the like, comprising:
- a blade shell formed from a relatively low inertia material to have a hub section formed integrally with a circumferentially arranged array of centrifugal impeller blades and a generally conical recess formed in said hub section with a base diameter generally at one end of said and an apex disposed generally on a central axis of said shell, said shell further including a relatively small gate passage extending generally along said central axis between the apex of the hub section recess and the opposite axial end of said shell;
- a hub insert having a size and shape for generally mating reception into the hub section recess, said hub insert being formed from a relatively low inertia material relatively resistant to fatigue failure in comparison with said shell and comparable with said shell for inertia welding thereto;
- each of said shell and hub insert, having inner peripheries on the same radial plane, defining a portion of a bore formed along the central axis of said shell and hub insert.
A method of making a centrifugal compressor wheel for turbochargers and the like, comprising the steps of:
- forming a blade shell to have a hub section integral with a circumferentially arranged array of centrifugal impeller blades and a generally conical recess in the hub section with a base diameter generally at one axial end of the shell and centered about a shell central axis and an apex disposed generally on the shell central axis;
- forming a hub insert from a material relatively resistant to fatigue failure in comparison with the blade shell to have a size and shape for mating reception into the hub section recess;
- securing the hub insert into the hub section recess with a substantially uninterrupted bond extending substantially continuously over the conical interface between the hub insert and shell;
- and
- forming a central bore having a relatively constant diameter through the hub insert and shell such that the inner periphery of each lie on the same radial plane, said bore being centered generally on the shell central axis, a portion of said bore defined by said shell.
2 more elements
A method of making a centrifugal compressor wheel for turbochargers and the like, comprising the steps of:
- forming a blade shell to have a hub section integral with a circumferentially arranged array of centrifugal impeller blades and a generally conical recess in the hub section with a base diameter generally at one axial end of the shell and centered about a shell central axis and an apex disposed generally on the shell central axis, and a relatively small gate passage communicating between the apex of the hub section recess and the opposite axial end of the shell;
- forming a hub insert from a material relatively resistant to fatigue failure in comparison with the blade shell to have a size and shape for mating reception into the hub section recess;
- securing the hub insert into the hub section recess with a substantially uninterrupted bond extending substantially continuously over the conical interface between the hub insert and shell;
- and
- forming a central bore through the hub insert and shell centered generally on the shell central axis, thereby removing the relatively small gate passage.
2 more elements
A method of making a centrifugal compressor wheel for turbochargers and the like, comprising the steps of:
- casting a blade shell from a relatively low inertia material to have a hub section integral with a circumferentially arranged array of centrifugal impeller blades and a generally conical recess in the hub section with a base diameter generally at one axial end of the shell and centered about a shell central axis and an apex disposed generally on the shell central axis, and further to include a relatively small gate passage communicating between the apex of the hub section recess and the opposite axial end of the shell;
- forming a hub insert from a material relatively resistant to fatigue failure in comparison with the blade shell to have a size and shape for mating reception into the hub section recess;
- forming a central bore through the hub insert and shell and thereupon removing the gate passage in the shell;
- and
- inertia welding the hub insert into the hub section recess
2 more elements
Dependencies are inferred from the claim text.