| 摘要 |
PROBLEM TO BE SOLVED: To easily reduce intake noise in the intake system of an engine for arranging an air cleaner. SOLUTION: The air cleaner 2 is arranged in the intake passage 1 of the engine, and the bottom wall surface 5 of the air cleaner 2 positioned higher than the drain 4 of the air cleaner 2 is formed of a porous material such as filter paper, non-woven fabric or continuous foam sponge.
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