| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of reducing the adhesion of impurities and changes of injection characteristics of a reducing agent and promoting the reduction of NOx. SOLUTION: A body part 43 extending in the direction of central axis of an exhaust pipe is formed in a nozzle body in a nozzle part 40. A recessed part 44 opening on the downstream side of exhaust emission stream is formed in the body part 43, and a jet hole 46 communicated with a nozzle sac 45 through which the reducing agent is introduced onto a bottom 441 of the recessed part 44 is communicated with the body part 43. Since the recessed part 44 is opened on the downstream side of exhaust emission stream, the reducing agent is injected in the direction of downstream side along exhaust emission stream from the jet hole 46. Since a flow of exhaust emission flowing in the exhaust pipe is prevented by the body part 43, exhaust air turning round onto an opening side of the recessed part 44 is reduced. Moreover, since the jet hole 46 is opened on the bottom 441 of the recessed part 44, exhaust emission entering the jet hole 46 and its surroundings is reduced. For this reason, the adhesion and deposit of impurities to the jet hole 46 and its surroundings, and changes of injection characteristics of the reducing agent are reduced.
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