| 摘要 |
<p>Cooling fins (40) are fixed to both a holder portion (36) and a flange (38). Thus, the cooling fins (40) serves not only the cooling (heat dissipating) function but also the function as reinforcing ribs. Therefore, the cooling fins (40) increases the rigidity of an injection valve holder (32), thereby making it possible to suppress occurrence of an offset of the direction of a spray formed by a urea solution injection valve (16) from the proper direction due to the deflection of the urea solution injection valve (16) and insufficient sealing performance between the flanges (38, 42).</p> |
