| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To increase regeneration efficiency of a particulate matter removing filter. <P>SOLUTION: An intermediate zone A where arrangement of small holes 17 is densest, a base end side zone B where arrangement of the small holes 17 is sparse, and a tip side zone C where arrangement of the small holes 17 is sparser, are formed on a pipe body 16A of a flow in pipe 16 in an exhaust emission control device 14. A no-hole zone D where no small holes 17 is arranged is formed between the intermediate zone A and the base end side zone B. Consequently, flow speed of exhaust pipe passing at a radial direction center part of the particulate matter removing filter 20 is set higher than flow speed of exhaust gas passing at an outer circumference side of the particulate matter removing filter 20 to concentrate accumulation of particulate matters at a center part of the particulate matter removing filter 20. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
