Exhaust device of engine

An exhaust device of an engine, the device comprising:

• an exhaust emission control catalyst provided in an exhaust passage of the engine;
• a particulate collection filter disposed on a downstream side of the exhaust passage in an exhaust flow direction from the exhaust emission control catalyst and is adjacent to the exhaust emission control catalyst;
• and
• a connection passage that connects the exhaust emission control catalyst and the particulate collection filter to each other,
• the particulate collection filter has a transverse section having a flat shape and including a pair of opposing short sides and a pair of opposing long sides,
• the connection passage partially has a small cross-sectional area portion, a flow passage cross-sectional area of which is smaller than an area of the transverse section of the particulate collection filter,
• an enlarged portion is formed in a connection portion with the particulate collection filter in the connection passage, the enlarged portion having a flow passage cross-sectional area enlarged from upstream to downstream in the exhaust flow direction so as to be as large as the area of the transverse section of the particulate collection filter, and
• a guide wall portion is provided in the enlarged portion, the guide wall portion deflecting exhaust gas having passed through the small cross-sectional area portion such that the exhaust gas swirls along an entire peripheral wall of the enlarged portion,
• the connection passage is connected to the exhaust emission control catalyst and the particulate collection filter such that the small cross-sectional area portion extends in the vertical direction,
• in addition, the guide wall portion is formed at a portion on the peripheral wall of the enlarged portion far from the side wall portion of the engine body, extends in the vertical direction, and is curved downward so as to approach the side wall portion of the engine body, and
• a lower portion of the guide wall is curved and inclined upward toward the engine body side.