Patent attributes
The invention has its object to realize compact arrangement of particulate filter 5 and selective reduction catalyst 6 for improved mountability on a vehicle while a sufficient reaction time is ensured for generation of ammonia from urea water. In an exhaust emission control device with the filter 5 and the catalyst 6 capable of selectively reacting NOx with ammonia even in the presence of oxygen being incorporated in an exhaust pipe 4, urea water as reducing agent being addible therebetween, the filter 5 is arranged in a fore-and-aft direction of a vehicle and along a frame 10 of the vehicle. The catalyst 6 is arranged in a vicinity of an inlet end of the filter 5 and directed laterally outward of the vehicle. A communication passage 9 is arranged to guide the exhaust gas 3 discharged from an outlet end of the filter 5 to an inlet end of the catalyst 6 in a forwardly fold-back manner. A urea water adding injector 11 (urea water adding means) for addition of urea water is arranged midway of the passage 9.
