TURBINE ROTOR AND TURBOCHARGER INCORPORATING SUCH TURBINE ROTOR

摘要

The purpose of the present invention is to provide a turbine rotor in which a demarcation position of a balance correction section provided to a turbine wheel (5) back surface is clear and which even in mass production enables balance cuts and overlay welding to be made evenly, as well as a turbocharger using the turbine rotor. The turbine rotor is provided with the following: a turbine wheel (5) precision-cast from titanium-aluminum alloy and constituting a hub (50) which passes through the center of a wheel axis of rotation and on the outer periphery of which a plurality of impellers (40) are disposed in the peripheral direction, with notches made between all adjacent impellers (40) to form webbed scallops (30); a rotor shaft (7) fixedly provided along a wheel axis of rotation (C-C) on the turbine wheel hub back surface side; and a balance cut section (11) provided to the turbine wheel hub back surface side along a rotating wheel peripheral direction. The minimum diameter (BCmin) of the balance cut is greater than the maximum diameter of the rotor shaft wheel attachment side, the balance cut maximum diameter (BCmax) is smaller than the turbine wheel scallop diameter (S), and a peripheral direction region (balance cut) is set at a position at which "the sheet thickness t from the wheel back surface to the hub surface is 1.75t ≥ w" (w: the radial width of such peripheral direction region).