EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

To provide an exhaust emission control device of an internal combustion engine which achieves improvement of purification characteristics without increasing the size of a catalyst.SOLUTION: In an exhaust emission control device of an internal combustion engine, a catalytic converter 40 is attached to an engine including a plurality of cylinders 10a to 10d and a plurality of exhaust passages 20a to 20d communicating with the plurality of the cylinders 10a to 10d. In a confluent part 30 connected to the downstream side of the exhaust passages 20a to 20d, a diffusion part 32 which facilitates jet flow of a main stream of exhaust gas flowing into the confluent part 30 is provided. Further, on an inner wall of the confluent part 30 facing inflow ports 31 of the exhaust gas provided at the exhaust passages 20a to 20d, a diffusion surface 33 which three-dimensionally diffuses the main stream of the exhaust gas linearly flowing from the inflow ports 31 into the confluent part 30 is formed.SELECTED DRAWING: Figure 1 【課題】触媒を大きくすることなく、浄化特性の向上が図れる内燃機関の排気浄化装置を提供する。【解決手段】複数の気筒１０ａ～１０ｄ、及び複数の気筒１０ａ～１０ｄに連通する複数の排気通路２０ａ～２０ｄを備えたエンジンに触媒コンバータ４０が付設された内燃機関の排気浄化装置であって、排気通路２０ａ～２０ｄの下流側に接続する合流部３０に、該合流部３０内に流入する排気ガスの主流の噴流を促す拡散部３２が設けられている。また、排気通路２０ａ～２０ｄに設けられた排気ガスの流入口３１と対向する合流部３０の内壁に、流入口３１から合流部３０内に直線的に流入する排気ガスの主流を３次元的に分散する分散面３３が形成されている。【選択図】図１