| 摘要 |
PROBLEM TO BE SOLVED: To improve turbine efficiency of a variable displacement type supercharger 1 up to a high level.SOLUTION: An annular installation groove 85 is formed on an opposite surface of an opposed surface of a shroud ring 55, an annular communicating groove 87 for communicating a plurality of second support holes 59 is formed on a bottom surface of the installation groove 85, an annular cover member 89 is arranged in the installation groove 85 so as to block up an opening parts of the plurality of second support holes 59 and an opening part of the communicating groove 87, an extraction passage 91 for extracting exhaust gas from spaces of the plurality of second support holes 59, is formed in the shroud ring 55, and the outlet end of the extraction passage 91 communicates with the inlet side of a turbine impeller 29. |
