| 摘要 |
PROBLEM TO BE SOLVED: To provide turbine disk connecting mechanism which can use materials different substantially in coefficients of thermal expansion for a turbine disk, can absorb the difference in thermal expansion caused by the difference in the coefficients of the materials, can transmit torque for driving a compressor, hardly causes center offset and has high flexural rigidity. SOLUTION: The connection section 13 of the turbine disk and a compressor shaft comprises a plurality of trapezoidal recessed grooves 13a provided in one of the two and a plurality of trapezoidal protruded sections 13b provided in the other one to be fitted to these recessed grooves 13a. The trapezoidal recessed grooves and the trapezoidal protruded sections from the inclined faces of a trapezoid respectively and contact each other at two faces 13c and 13d extending radially. A tie bolt is cylindrical in its hollow section and has a male thread section provided at one end of the tie bolt and threadedly engaged with the female thread section of the compressor shaft, and a head section provided at the other end of the tie bolt and is projected from the shoulder section of the turbine disk in a radial and outer direction, and is held tensioned. This holds the turbine disk pressed against to the side of the compressor shaft.
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