Compressor impeller with stress riser

Details Compressor impeller with stress riser Compressor impeller with stress riser

2006-02-21

2006-02-21

Freay, Charles G. (Department: 3746)

Pumps

Including disengageable rotary or frangible drive connection

C417S405000, C417S406000, C417S407000, C417S408000, C417S409000, C416S24400R, C416S20400A, C415S170100, C415S230000, C415S209200

Reexamination Certificate

active

07001155

ABSTRACT:
A compressor impeller for use with a boreless turbocharger is provided in accordance with this invention. The compressor impeller comprises an integral hub projecting axially therefrom that includes a partial bore therein that extends from an open to a close bore end. The bore includes a threaded portion that is configured to accommodate threaded engagement with an end of a common shaft disposed through a turbocharger housing and attached at an opposite end to a turbine wheel. The hub is specially configured so that the threaded portion has a relatively increased wall thickness when compared to a remaining portion of the bore disposed between the threaded portion and the end of the bore. The bore is configured providing a section having a reduced wall thickness, between the threaded portion and the bore closed end, for purposes of providing a preferential stress relief mechanism. Configured in this manner, the compressor impeller operates to ensure that, in the event of a stress-related compressor impeller failure, the shaft will be contained in its proper placement within the turbocharger.

REFERENCES:
patent: 2602683 (1952-07-01), Aue
patent: 2795371 (1957-06-01), Buchi, Sr. et al.
patent: 3874824 (1975-04-01), Cronstedt et al.
patent: 3901623 (1975-08-01), Grennan
patent: 3904301 (1975-09-01), Schroeder
patent: 3914067 (1975-10-01), Leto
patent: 3961867 (1976-06-01), Woollenweber
patent: 4935656 (1990-06-01), Kawamura
patent: 4986733 (1991-01-01), Fleury et al.
patent: 5193989 (1993-03-01), Fleury et al.

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