| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device enhancing the durability of an ammonia injection valve by reducing heat which the ammonia injection valve receives from exhaust gas. <P>SOLUTION: The exhaust emission control device 10 comprises an injector 21 adding ammonia to exhaust gas. The injector 21 is fixed by a holding member 28 to an exhaust pipe part 13 forming an exhaust passage 14. The holding member 28 has a heat receiving part 52 covering the tip of the injector 21. The heat receiving part 52 is supplied with liquid ammonia stored in a tank part 22. The ammonia passing through the heat receiving part 52 is vaporized in the heat receiving part 52. The holding member 28 formed with the heat receiving part 52 is cooled by the heat of vaporization of ammonia, and heat transmission from an exhaust passage 14 to the electromagnetic driving part 31 side of the injector 21 is intercepted by the heat receiving part 52. As a result, the influence of heat received by the injector 21 is reduced, and vaporization of ammonia is accelerated by passing through the heat receiving part 52. <P>COPYRIGHT: (C)2009,JPO&INPIT |
