| 摘要 |
PURPOSE:To enable reduction of production of stress at an engaging part, by a method wherein, in a device having a moving folk and an impeller fork, respectively formed with engaging teeth, which are engaged with each other, and the thickness of each of the engaging teeth at the central part in the direction of an axis of at least the one of the forks is increased over that of the other engaging teeth. CONSTITUTION:A titled coupling structure is such that a moving fork 12, formed with plural engaging teeth 12a formed axially in parallel in a built-in part 1b of the root part of a turbine moving vane 1, is engaged with an impeller fork 13 formed with plural engaging teeth 13a formed axially in parallel in the outer periphery of an impeller 4. A lock pin 7 is axially extended through the two forks 12 and 13 to couple the moving vane 1 and the impeller 4. In which case, the thickness in the direction of an axis of each of the engaging teeth 13a, at the central part in the direction of an axis near to the center of gravity, of the engaging teeth 13a of the impeller fork 13 is increased over the thickness in the direction of an axis of the other engaging teeth 13a. this enables uniformization of mutual stress distribution of the impeller form 13.
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