Composite component for use in exhaust gas turbocharger of motor vehicle, has shaft possessing higher thermal expansion coefficient than that of hub part i.e. turbine wheel, such that hub part and shaft are radially braced with each other

摘要

The composite component (8) has a shaft (1) i.e. turbocharger shaft, extending into an opening i.e. cylindrical through-hole, of a hub part (5) i.e. turbine wheel, and connected with the hub part by a radial press fitting. The shaft possesses a higher thermal expansion coefficient than that of the hub part such that the hub part and the shaft are radially braced with each other during the operation of the composite component under temperature effect. The turbine wheel is made of a titanium-aluminum alloy, and the shaft is made of a high heat-resistant steel material.