EXHAUST PURIFICATION APPARATUS

摘要

An exhaust purification apparatus for internal combustion engine having a back-folded section of exhaust passageway and being compacted, which exhaust purification apparatus realizes inflow of a uniformly dispersed reducing agent for a reduction catalyst disposed along a downstream-side exhaust passageway. The exhaust purification apparatus comprises an exhaust passageway with back-folded section; a reducing agent supply part for supply of a reducing agent into the exhaust passageway, disposed at the back-folded section; and a reduction catalyst for reduction purification of nitrogen oxides with the use of the reducing agent, disposed in the exhaust passageway downstream of the back-folded section. The exhaust purification apparatus has a housing including a main body section wherein the upstream-side exhaust passageway and downstream-side exhaust passageway are accommodated and lid sections with upstream-side exhaust passageway exit opening and downstream-side exhaust passageway entrance opening, fitted to side faces of the main body section. The back-folded section consists of space surrounded by the main body section and lid sections. The face of the lid sections opposite to the downstream-side exhaust passageway entrance opening is provided, by integral molding, with a guide part for orienting the direction of flow of exhaust gas mixed with the reducing agent to the downstream-side exhaust passageway.