| 摘要 |
<p>A connection method for turbo charger turbine shaft capable of increasing the accuracy of connection between a wheel and a turbine shaft, comprising the steps of forming at least a part of the inner peripheral wall of a fitting hole (3) of the wheel (1) in a tapered shape so that the diameter of the hole is decreased gradually from the opening side to the inside of the fitting hole, providing a tapered axial contact part (7) allowed to fit to the tapered inner peripheral wall and an insert part (6) with a constant diameter inserted into the fitting hole (3) at one end of the turbine shaft (4) connected to the wheel, and fixedly connecting the wheel (1) to the turbine shaft (4) concentrically to each other on the rotating axes thereof, whereby, since the axial contact part (7) is provided on the turbine shaft (4) in an area other than a molten part (11) by welding, the axial dimension of the turbine shaft (4) can be prevented from varying at the time of contraction due to melting, since the axial contact part (7) is formed in the tapered shape and the inner peripheral wall of the fitting hole in contact with the contact part is formed in the tapered shape, the wheel (1) is surely fitted to the turbine shaft (4), and both are guided so as to be positioned on the same axis and, since the insert part (6) is provided together with the axial contact part (7), the adhesiveness of the axial contact part (7) where tapered faces come into contact with each other is stabilized.</p> |
