| 摘要 |
PURPOSE:To eliminate the generation of looseness in a blade mounting part further improve fatigue strength, by longitudinally providing a hole or groove in the lower part of a blade root or of a blade fixing groove bottom. CONSTITUTION:A section of a blade root part 3 is formed to a tub table shape, and this blade root part 3 is fitted into a blade fixing groove 4, provided in a rotor 1, then a blade 2 is mounted and fixed to the rotor 1. Then a round hole 11 is provided in a lower part of this blade root part 3, further a protrusion 12 is provided below said hole 11. In this way, the root part 3, applied with a press fit margin, can be easily press fitted into the groove 4. |
