| 摘要 |
PROBLEM TO BE SOLVED: To further reduce unbalance force due to rotor whirling, in a gas turbine having a bearing installed in a fusible manner so as to allow local displacement of a rotor due to a blade loss accident. SOLUTION: A first bearing 32 and a second bearing 34 support a shaft 24 rotatably against an irrotational supporting structure 30. The first bearing 32 is supported in a fusible manner and the resisting force of the shaft 24 against the displacement (of the shaft 24) in the radial direction is released when the force in the radial direction exceeding a prescribed threshold value is transmitted (to the shaft 24) via the first bearing 32, allowing abnormal deflection of the shaft 24 in the first position in the longitudinal direction. The shaft 24 comprises a weakened yield area 58 prescribed in the vicinity of the second position in the longitudinal direction, so that the shaft 24 deforms inelastically in the yield area, when one of a plurality of fan blades is lost, shifting the center of gravity of a rotor from an initial position within the rotor to an eccentric position.
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