| 摘要 |
A turbocharger has an impeller 1 formed from of a first material e.g. aluminium mounted on a turbocharger shaft 2 by means of an internally threaded insert 3 of a higher strength material than the first material interference fitted into the impeller, and a constraining ring 14 of a material having a lower thermal coefficient of expansion than the first material and surrounding a part of that axial length of the impeller which overlies the insert. The ring 14 prevents the tendency of the impeller 1 to walk along the insert 3 during the operating cycle.
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