| 摘要 |
PURPOSE:To suppress the thermal fatigue of the top edge of an exhaust tube and prevent the generation of crack on the edge surface by directing the top edge of a cooling hole or a cooling water pipe to the top edge of the exhaust tube and cooling the top edge part of the exhaust tube by spring the cooling water. CONSTITUTION:A portion of the cooling water pumped up by a water pump which is interlocked with an engine is branched and flows in a cooling water hole 9, and is blown towards the top edge part of an exhaust tube 6 from the lower edge, and concentrically cools the top edge of the exhaust tube 6. Accordingly, the thermal fatigue of the top edge part of the exhaust tube 6 can be reduced, and the formation of crack from the edge surface can be prevented, and durability can be improved. |
