| 摘要 |
An internal combustion engine installed in an engine compartment 15 covered with an engine cover C is provided with an intake air passage P. The intake air passage P extends continuously from an intake air inlet Pi to intake air outlets Pe in the engine compartment 15 and has a first down passage 62 , a reversing passage 63 , an up passage 64 and a second down passage 67 c arranged in the order in the flowing direction of combustion air. The combustion air taken through the intake air inlet Pi into the intake air passage P flows down through the first down passage 62 , the reversing passage 63 reverses the flowing direction of the combustion air that has flowed down through the first down passage 62 such that the combustion air flows up, flows up through the up passage 64 to a position at a level higher than that of an uppermost intake air outlet Pe. Then, the combustion air flows down through the second down passage 67 c and flows through the intake air outlets Pe into combustion chambers 30 . Thus, an effect on preventing the flow of water into the combustion chamber 30 of the engine is improved.
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