| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of a crack between the valves of a cylinder head while reducing the weight of an engine and while preventing the occurrence of fall of a nozzle hole mouthpiece. SOLUTION: A nozzle hole mouthpiece 21 is installed in a combustion auxiliary chamber 11 of an overhead valve type cylinder head 1 provided with the combustion auxiliary chamber 11 and an intake and an exhaust valves 34, 35. A head main body 10 of this cylinder head 1 is formed by cast molding the aluminum material, and a heat resistant member 20 having a diameter larger than that of a cylinder bore 6 is installed in a part of the head main body 10 opposite to the combustion chamber, and the nozzle hole mouthpiece 21 is fixed through the heat resistant member 20.
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