Exhaust gas purification device for engine

摘要

A main particulate filter (22m) having a relatively large volume is arranged in an exhaust passage of an engine, and an auxiliary particulate filter (22s) having a relatively small volume is arranged in the exhaust passage upstream of the main particulate filter (22m). The main and auxiliary particulate filters (22m,22s) are arranged so that the open downstream ends (61d) of the single open end-type exhaust gas passages (61) of the auxiliary particulate filter (22s) and the open upstream ends (65u) of the open upstream end-type exhaust gas passages (65) of the main particulate filter (22m) substantially face each other, and the open downstream ends (62d) of the both open end-type exhaust gas passages (62) of the auxiliary particulate filter (22s) and the closed upstream ends (66u) of the open downstream end-type exhaust gas passages (66) of the main particulate filter (22m) substantially face each other. A catalyst having an oxidation function is carried on the auxiliary particulate filter (22s).