To provide a turbine housing capable of increasing degree of freedom in design of a bypass passage by avoiding stress concentration generated in an inner pipe shape member of a double structure part.
This turbine housing 3A is provided with a scroll part 6 communicating to an inlet part 4 and extending to a wheel storage part 5, an outlet part 7 for discharging gas passing through a wheel storage part 5, and a bypass passage part 8 connecting the inlet part 4 and the outlet part 7 so as to bypass the wheel storage part 5. Part from the inlet part 4 to the scroll part 6 is constructed as the double structure part 10 in which the inner pipe shape member 11 and an outer pipe shape member 12 are combined with a gap S formed therbetween, The double structure part 10 is constructed in such a manner that gas can be introduced by making the gap S communicate with the inlet part 4 and the bypass passage part 8 is constructed to communicate with the gap S of the double structure part 10.
COPYRIGHT: (C)2009,JPO&INPIT
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