Turbocharger for internal combustion engine
A turbocharger is described comprising: a housing assembly; a compressor wheel arranged in the housing assembly; a compressor whell arranged in the housing assembly; and a shaft rotatably connected in the housing assembly. The turbine wheel is made from one-piece ceramic material and has a base portion, angularly spaced blades on the base portion, and a support portion extending axially from the base portion. The shaft is made from a metal material, and has an axial bore opening at one end. The support portion has an increased diameter which is in a tight-fit relationship with respect to the bore in order to fixedly connect the wheel to the shaft without using any additional connecting means, so that an axially extending first annular slit is formed between the outer surface of the support portion and the inner surface of the bore on the side of the increased diameter portion near the base portion. A second annular slit is formed between the facing end surfaces of the shaft and the base portion. The first and second annular slits are connected to each other and alone serve to allow for differential thermal expansion between the shaft and the turbine wheel.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha, Aichi
- Patent Number(s):
- US 4704074
- OSTI ID:
- 5802651
- Resource Relation:
- Patent File Date: Filed date 10 Jun 1985
- Country of Publication:
- United States
- Language:
- English
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