| 摘要 |
PURPOSE:To ensure the binding force between a radial turbine wheel and a support shaft, by forming a seal ring receiving groove with the use of a metal which is excellent in shock-resistivity in comaprison with ceramic materials, and as well by arranging the groove in a position which is hardly subjected to thermal affection by exhaust gas flowing through a bearing housing. CONSTITUTION:The interference fit area L between a bearing receiving hole 16 and a wheel bearing 14 is positioned in a floating bearing section which is subjected to less thermal affection by exhaust gas flowing through a turbin housing. Further, a seal ring receiving groove 17 for holding a seal ring 22 is formed in a metal support shaft 15. With this arrangement, even if a ceramic radial turbine wheel 11 is broken for some cause, the seal ring 22 may be held. |
