Turbine wheel including a turbine disk, turbine blades, and seal plates

A turbine wheel comprising:

• a turbine disk including a plurality of groove portions which are formed in its outer periphery;
• a plurality of turbine blades respectively including protrusions which are formed on their base ends, and fixed to the turbine disk by fitting the protrusions into the groove portions in an axial direction;
• outer annular grooves each formed in one axial end surface of a corresponding turbine blade, and each opened inward in a radial direction;
• an inner annular groove formed in one axial end surface of the turbine disk, and opened outward in the radial direction;
• and
• seal plates for sealing gaps between the groove portions and the protrusions, each seal plate being fixed to the one axial end surface of a respective one of the plurality of turbine blades and the one axial end surface of the turbine disk with a radially outer end portion of the seal plate in contact with a groove bottom of the outer annular groove of the respective one of the plurality of turbine blades, and with a radially inner end portion of the seal plate in engagement with a step portion in the inner annular groove,
• wherein
• each seal plate is formed from an elastic plate member whose radially intermediate portion is curved projecting in a first direction toward the one axial end surface of the respective one of the plurality of turbine blades and the one axial end surface of the turbine disk, and
• each seal plate includes
• an assembly recessed portion, which is recessed in a direction getting closer to the one axial end surface of the respective one of the plurality of turbine blades and the one axial end surface of the turbine disk, in a position near a radially outer end of the seal plate, the assembly recessed portion being adapted to receive a tip end of a tool and being formed in a part of the seal plate that is continuously curved with the radially intermediate portion to project in the first direction, and
• a disassembly protrusion, which projects in a direction getting away from the one axial end surface of the respective one of the plurality of turbine blades and the one axial end surface of the turbine disk, in a position near a radially inner end of the seal plate,
• wherein each seal plate is adapted to elastically deform to flatten a curve of the radially intermediate portion when the tool, with the tip end received in the assembly recessed portion, is moved in the first direction.