| 摘要 |
PURPOSE:To dispense with any highly accurate machining for a fitting part as well as to make a manufacturing process ever so easy, by fitting a convex part of a ceramic turbine wheel into a concave part of a metallic rotary shaft in a way of making up some play between them. CONSTITUTION:A convex part 14 installed in a tip end of a rotary shaft 11 to be solidly formed with a ceramic turbine wheel 16 is fitted in a concave part 13 installed in a tip end of a metallic rotary shaft 12 in a way of making up some play between them, thus a turbine rotor is formed. With this constitution, a dimensional difference in time of fitting operation is well absorbed by plastic or elastic deformations in the concave part whereby a thermal expansion differential is as well absorbed by a clearance 15. Accordingly, highly machining accuracy in the fitting part is no longer required. |
