Titanium aluminide wheel and steel shaft connection thereto

Details Titanium aluminide wheel and steel shaft connection thereto Titanium aluminide wheel and steel shaft connection thereto

2007-10-30

2007-10-30

Edgar, Richard A. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Welded, cemented or fused

C416S24400R

Reexamination Certificate

active

10900645

ABSTRACT:
Titanium aluminide (TiAl) rotor shaft assembly (10) of a type used in a turbocharger has a TiAl rotor (20) with an axially protruded portion (40) that is fixedly joined to a recessed portion (50) of a metal shaft (30) by the synergistic combination of an interference fit, such as a heat shrinkage fit, further supported by a brazed joint (60) in which a thin layer of a brazing material (110) is interposed between the surface of the protruded portion (120) and the recessed surface (130). Optionally, one or both of the jointed surfaces have braze channels (90) to facilitate braze flow within the joint. Methods for producing the rotor shaft assembly (10) and a turbocharger having the rotor shaft assembly (10) are provided.

REFERENCES:
patent: 3666302 (1972-05-01), Kellett
patent: 4778345 (1988-10-01), Ito et al.
patent: 6007301 (1999-12-01), Noda et al.
patent: 57093606 (1982-06-01), None
patent: 02124780 (1990-05-01), None
patent: 02149477 (1990-06-01), None
patent: 03054174 (1991-03-01), None

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