| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas passage structure surely bringing urea water into collision for atomization without increasing cost, improving the dispersing performance of the urea water into exhaust gas, and capable of suppressing a rise of back pressure on a downstream side in an exhaust gas flowing direction. SOLUTION: On an upstream side of an exhaust emission control device 2, as the exhaust gas passage structure provided with an addition agent injection device 3 injecting the urea water, a platy dividing wall 14 extending in the exhaust gas flowing direction in an exhaust gas passage 1 and dividing that into two passages 12, 13 is provided in the exhaust gas passage 1 on the upstream side in the exhaust gas flowing direction rather than the addition agent injection device 3. The dividing wall 14 is provided with an extension portion 141 generally horizontally extended so as to vertically divide the two passages 12, 13 near the addition agent injection device 3 on a downstream side in the exhaust gas flowing direction. Against an upper surface side of the extension portion 141, the urea water injected from an injection port 32 of an injection nozzle 31 so as to cross the exhaust gas passage 1 is made to collide. COPYRIGHT: (C)2009,JPO&INPIT
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