Patent ID: 8770919

Claim:
A turbine disk that is supported rotatably and in which a plurality of rotor blades is arranged on a circumference thereof in a circumferential direction, the turbine disk comprising: a plurality of first cooling holes that penetrates the turbine disk from inside toward outside thereof in a radial direction of the turbine disk, that is communicatively connected to a cooling passage provided inside of each of the rotor blades, and that is arranged in the circumferential direction; and a plurality of second cooling holes that are positioned between each of the first cooling holes, and penetrates the turbine disk from the inside toward the outside thereof in a radial direction of the turbine disk, wherein base ends of the first cooling holes and the second cooling holes are configured to receive cooling gas, leading ends of the first cooling holes and the second cooling holes are communicatively connected to a radial direction communicating channel arranged in the circumferential direction, a plurality of fitting grooves arranged on an outer circumference in the circumferential direction are fitted with respective fitting protrusions on the rotor blades to form axial direction communicating channels in spaces between the fitting grooves and the rotor blades along an axial direction, the first cooling holes are arranged correspondingly to the axial direction communicating channels in the circumferential direction, and the leading ends thereof are communicatively connected to the radial direction communicating channel and the axial direction communicating channels, and the second cooling holes are arranged between the first cooling holes in the circumferential direction, and have the leading ends sealed, and are communicatively connected to the radial direction communicating channel.