| 摘要 |
PROBLEM TO BE SOLVED: To prevent damages to a catalyst support 13 due to movement of foreign matter around such as weld spatters, on an end face of the catalytic carrier 13. SOLUTION: On an end face on the upstream side in the exhaust flow direction of a catalyst support mat 14 wrapped around the catalyst carrier 13, a recess groove 17 in the V-shaped for trapping the foreign matter is provided. |
