Turbine housing assembly and method of manufacturing turbine housing assembly

摘要

An object is to provide a turbine housing assembly in which reduction of weight, facilitation of manufacture, cost-cutting, and reduction of heat capacity are further promoted compared to a conventional turbine housing made of sheet metal. A turbine housing assembly includes a plurality of constituent members connected to one another to constitute a turbine housing into which a turbine wheel is inserted. The turbine housing assembly 1 at least includes a scroll part 2 of a bottomed cylindrical shape that has a surrounding wall part 20 and a bottom face part 22, the scroll part including an exhaust gas flow path 2A of a spiral shape formed inside the bottomed cylindrical shape and configured such that exhaust gas that has flowed in from an exhaust gas inlet 24 flows through the exhaust gas flow path 2A; and an exhaust gas outlet 2B having a through hole formed on the bottom face part 22, the exhaust gas outlet 2B being configured such that the exhaust gas that has flowed through the exhaust gas flow path 2A flows out from the exhaust gas outlet 2B and a connection part 4 connectable to a bearing housing that houses a bearing for supporting a rotation shaft of the turbine wheel. The scroll part 2 and the connection part 4 are each formed by processing a single piece of sheet metal and each welded to an annular lid part 6 that is orthogonal to a turbine axial direction line 7, so that the scroll part 2 and the connection part 4 are connected to each other in the turbine axial direction via the annular lid part 6.