Abstract: A turbine casing divided in an axial direction into a first casing and a second casing coupled to each other by flanges of the first casing and the second casing. The first casing and the second casing are divided into two parts as viewed from the axial direction, the two parts being an upper half casing and a lower half casing. The turbine casing having three or more sets of a first radial reference surface and a second radial reference surface in a circumferential direction, the first radial reference surface being disposed in a flange peripheral portion of the first casing, and the second radial reference surface being disposed in a flange peripheral portion of the second casing. Each first radial reference surface is located at an equal distance from a turbine central axis. Each second radial reference surface is located at an equal distance from the turbine central axis.

Abstract: A turbine casing divided in an axial direction into a first casing and a second casing coupled to each other by flanges of the first casing and the second casing. The first casing and the second casing are divided into two parts as viewed from the axial direction, the two parts being an upper half casing and a lower half casing. The turbine casing having three or more sets of a first radial reference surface and a second radial reference surface in a circumferential direction, the first radial reference surface being disposed in a flange peripheral portion of the first casing, and the second radial reference surface being disposed in a flange peripheral portion of the second casing. Each first radial reference surface is located at an equal distance from a turbine central axis. Each second radial reference surface is located at an equal distance from the turbine central axis.

Abstract: A turbine wheel is provided with a groove having a bottom surface and a pair of side wall surfaces. The turbine wheel includes: a balance weight that is arranged in the groove, is insertable from any circumferential position of the opening of the groove, and has a through-hole opened toward one of the pair of side wall surfaces; and a retaining member that contacts the one of the pair of side wall surfaces in a state of being inserted in the through-hole of the balance weight, to thereby cause the balance weight to abut against the other one of the pair of side wall surfaces and be retained in the groove. The groove has engagement recesses provided at intervals in a circumferential direction at the bottom surface or an engagement protrusion fitted to one of fitting recesses provided at intervals in the circumferential direction at the bottom surface and protruding from the bottom surface.

Abstract: A turbine wheel is provided with a groove having a bottom surface and a pair of side wall surfaces. The turbine wheel includes: a balance weight that is arranged in the groove, is insertable from any circumferential position of the opening of the groove, and has a through-hole opened toward one of the pair of side wall surfaces; and a retaining member that contacts the one of the pair of side wall surfaces in a state of being inserted in the through-hole of the balance weight, to thereby cause the balance weight to abut against the other one of the pair of side wall surfaces and be retained in the groove. The groove has engagement recesses provided at intervals in a circumferential direction at the bottom surface or an engagement protrusion fitted to one of fitting recesses provided at intervals in the circumferential direction at the bottom surface and protruding from the bottom surface.