| 摘要 |
<p>PROBLEM TO BE SOLVED: To successfully join and fix an inside housing and an outside housing to each other, in a turbine housing having double-pipe structure.SOLUTION: A turbine housing 10 comprises an inside housing 12 and an outside housing 14. The inside housing 12 is made of a cast, is formed integrally and seamlessly by casting and comprises: a scroll part 21 which constitutes a spiral exhaust gas flow passage; and an outlet pipe part 22 which is a substantially tubular portion and is provided in a protruding condition along a turbine rotation center axial line C from the scroll part 21, and constitutes an outlet of an exhaust gas. The outside housing 14 is formed from a sheet metal and provided so as to cover the scroll part 21. The outside housing 14 abuts on a surface 25 at a side opposite to a side at which the outlet pipe part 22 is provided, of the inside housing 12, abutment parts between the outside housing 14 and the inside housing 12 are formed into a substantially-annular shape with the turbine rotation center axial line C as a center, and the abutment parts are welded together at a plurality of divided points S 11 ... with respect to a circumferential direction with the turbine rotation center axial line C as a center.</p> |
