| 摘要 |
PROBLEM TO BE SOLVED: To suppress accumulation of urea with a simple constitution, in a structure of an exhaust system provided with an addition device for adding an urea aqueous solution and the like to an exhaust gas.SOLUTION: In an exhaust system structure of an internal combustion engine including an exhaust pipe connected to the internal combustion engine, and an addition device disposed on the way of the exhaust pipe for adding an urea aqueous solution into an exhaust gas flowing in the exhaust pipe, an outer wall surface of a region with which the urea aqueous solution added from the addition device collides in the exhaust pipe is kept into contact with an outer wall surface of an exhaust system component disposed at an upstream side with respect to the region, thus a temperature of the region is increased. |
