| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling effect by air cooling by arranging an air-cooled passage formed through between an intake port and an exhaust port. SOLUTION: In a cylinder head 1, an air-cooled passage 30 is arranged through between an exhaust port 10 and an intake port 20. Therefore, a clearance is formed between the exhaust part 10 and the intake port 20, so that heat transfer from the exhaust port 10 side to the intake port 20 side is reduced. Consequently, the temperature rise of intake air flowing into a combustion chamber through the intake port 20 can be lowered, and deterioration of engine output due reduction of air density can be prevented. In addition, the air-cooled passage 30 can be formed closer to the combustion chamber side (lower face 2 side), because it is formed through between the exhaust port 10 and the intake port 20. In this way, cooling effect for the combustion chamber and a cylinder part arranged below the lower face 2 of the cylinder head 1 can be improved.
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