| 摘要 |
PROBLEM TO BE SOLVED: To reduce the intake noise when the intake amount is small by mounting an intake air variable mechanism without sacrificing the capacity of an air cleaner. SOLUTION: An intake duct 16 is divided into a fixed passage 21 having a uniform cross-section of the passage and a variable passage 22 changing the cross-section of the passage in accordance with the output of an engine, by a partition 20. The intake duct 16 is further divided into two to be composed of an outer member 23 and an inner member 24. A switching valve 30 is mounted inside of the outer member 23 in the variable passage 22, rotatable on an integrated rotating shaft 31 fixed between a rib 33 projecting from the inner member 24, and a wall face of the outer member 23, by the rib 33, and opened and closed by an actuator 32 mounted on an outer part of the inner member 24.
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