TURBOCHARGER TURBINE ROTOR AND MANUFACTURING METHOD THEREOF

摘要

A turbine rotor for a supercharger includes a TiAl turbine wheel and a carbon steel shaft joined to each other via an Ni brazing filler metal at a brazed part distanced from a back face of the turbine wheel so that a turbine wheel outer diameter ratio calculated by "a distance from the back face of the turbine wheel to the brazed part" / "an outer diameter of the turbine wheel" is within a range of from 7 to 10%.