| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine exhaust cooling system capable of efficiently cooling an exhaust flow path of an exhaust cooling adapter without enlarging the exhaust cooling adapter and increasing the burden of a water jet pump.SOLUTION: A main flow of cooling water from a cooling water inlet 36a of an exhaust cooling adapter heads a cooling water flow path 34a side from a cooling water flow path 34b side through a cooling water flow path 34d. A flow rate of cooling water heading the cooling water flow path 34b is small. For this reason, a flow rate of cooling water in a water jacket 34 is increased through acceleration in the cooling water flow path 34a and decreased in the cooling water flow path 34b. Therefore, the prevention of temperature rise and the enhancement of boilproof can be realized in an exhaust flow path inner peripheral surface corresponding to the cooling water flow path 34a which makes temperature easily rise. The prevention of temperature rise can be achieved even when a flow rate of cooling water is small in an exhaust flow path inner peripheral surface corresponding to the cooling water flow path 34b which resists temperature rise. A discharge direction of the cooling water outlet 38a and flow direction in the cooling water flow path 34a are the same, so that the system can enhance the effect. |
