| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust cooling adapter and an internal combustion engine exhaust system which can enhance cooling performance with respect to the whole of exhaust in an exhaust path in which deviation of a heating value to be absorbed from exhaust exists.SOLUTION: Exhaust cooling adapters 28, 36 for respective banks 8, 10 of an internal combustion engine 2 have a constitution in which passage capacities of cooling water passages 44a, 64a in water jackets 44, 64 corresponding to inner peripheral surfaces 50a, 70a on the upper part in a vertical direction against which exhaust through exhaust ports 26, 34 blows strong is expanded by increasing height and width. The presence of an abundance of cooling water can keep the temperature difference with exhaust gas large on the cooling water passage 44a, 64a sides. An abundance of a heating value can be promptly absorbed on the cooling water side. Heat is efficiently absorbed in cooling water through the positive utilization of deviation of a heat transfer quantity from exhaust. Other than the passage capacity, the heat transfer quantity may be increased with a cooling water flow rate, cooling water velocity, unevenness or the like. |
