| 摘要 |
PURPOSE:To have stable fastening of a turbine wheel even at a high temperature by fitting turbine wheel on a rotary shaft while such a condition is held, that a certain specific surface pressure is generated between the turbine wheel and the perimeter of an elastic material which is set in engagement with the rotary shaft. CONSTITUTION:A turbine wheel 10 is arranged outside an elastic member 12, which is set in engagement with a rotary shaft 8 in such a manner as incapable of rotating, and a bolt 52 is screwed in a tapped hole 40 of a nut 36 formed as in a single piece with the rotary shaft 8 upon threading the turbine wheel 10 and elastic member 12. Then the bolt 52 is driven fast while it deforms the elastic member 12 elastically. Thereby the difference of thermal expansion between the two members is absorbed by the elastic member 12 to serve maintenance of stably fastened state of the turbine wheel 10 to the rotary shaft 8. |
