| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device precluding an excessive temperature rise of urea water in a urea water tank. <P>SOLUTION: The urea water tank 150 is to store the urea water supplied to a urea water injector 44 and also store again the urea water returned from the injector 44, wherein the wall part to form the tank 150 is embodied in a double wall structure consisting of a first wall part 102 to serve as the shell of the tank 150 and a second wall part 104 provided inside the first wall part 102, whereby the urea water returned from the injector 44 is allowed to flow into a first accommodation part 108 formed between the first 102 and second wall parts 104. The urea water 106 in the first accommodation part 108 flows into a passage 132 formed between the first accommodation part 130 and the second wall part 104, and when the level of the urea water 106 in the first accommodation part 108 reaches the top of the passage 132, the urea water 136 in the passage 132 flows into a second accommodation part 112 formed inside the second wall part 104. <P>COPYRIGHT: (C)2010,JPO&INPIT |
