| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine that can suppress a rise in exhaust pressure by a deflection member when an exhaust flow rate increases while allowing exhaust to flow in an exhaust emission control device substantially equally when the exhaust flow rate is small.SOLUTION: An exhaust emission control device 4 includes an oxidation catalyst 7, a DPF 8, an SCR catalyst 9, and an ammonia oxidation catalyst 10 in this order from the upstream side. An exhaust passage 3 is formed in a channel shape right before the oxidation catalyst 7 and SCR catalyst 9, and exhaust changes its course by 180 degrees and flows in the oxidation catalyst 7 and SCR catalyst 9. Here, deflection members 21, 21 made of a temperature-sensing deformation material are arranged in a projection region on an inner wall of the exhaust passage 3 (channel-shaped part 31) when the oxidation catalyst 7 and SCR catalyst 9 are projected upstream. The deflection members 21, 21 deflect exhaust deviating outward and flowing in the curvature of the exhaust passage 3 toward the center and deform so as to make the deflection (exhaust resistance) of the flow of the exhaust less when the exhaust temperature is high than when the exhaust temperature is low. |
