Turbine housing assembly

Abstract

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 at least includes a scroll partand an exhaust partof a tubular shape having a separate body separate from the scroll part. The scroll partis formed by processing a single piece of sheet metal so that, on a back face side of a bottom face partof the scroll part, a recess portionon which a through-hole of an exhaust gas outletB is formed and a projecting portionformed by a bottom surface of an exhaust gas flow pathA projecting toward the back face side are formed, the projecting portionsurrounding the recess portion. The recess portionof the scroll partis connected to an end portionof the exhaust partin a turbine axial direction so that the exhaust partis in communication with the exhaust gas outletB of the scroll partin a state where a gap 'a' is formed between an outer circumferential face of the exhaust partand the projecting portionof the scroll part