| 摘要 |
The invention relates to a dosing module (10) for injecting a reduction agent, in particular a urea-water solution, into an exhaust pipe of an internal combustion engine, in particular of a self-igniting internal combustion engine, to reduce nitrogen oxides in the exhaust stream, wherein the dosing module has a main cooling element (12) through which a cooling liquid flows, in particular for cooling an injection valve (64) for the reduction agent. According to the invention, an additional cooling element (14), through which the cooling liquid likewise flows, in particular for cooling in the region of an electrical plug connection (22) and of an electromagnet (80) for actuating the injection valve (64), is placed on the basis cooling element (12), wherein a guide insert (30) for the cooling liquid is arranged in the main cooling element (12). As a result of the guide insert (30), priority cooling of the end section (72) of the injection valve (64) which is in direct contact with the hot exhaust stream of the internal combustion engine occurs. According to the invention, reliable operation of the dosing module (10) is ensured, even at ambient temperatures of 160° C. and above. |
