| 摘要 |
PROBLEM TO BE SOLVED: To provide a duct suppressing generation of whistle noise from a resonator communication hole of a duct body, even when an angle of a communication pipe of a resonator or a position of the resonator is restricted. SOLUTION: The duct is constituted of: the duct body 11A in which a resonator communication hole 17A is formed to a pipe wall of a tubular body incorporating an air flow passage 14A therein; and the resonator 31 disposed to the outside of the pipe wall to communicate to the air flow passage 14A through the resonator communication hole 17A. Air flows in the air flow passage 14 from one end side to the other side of the duct body 11A. In the pipe wall inner surface of the duct body 11, a projection 19A controlling an air flow is projected to the inside of the air flow passage 14 from an upstream periphery of the resonator communication hole 17A to suppress generation of the whistle noise from the resonator communication hole 17A. COPYRIGHT: (C)2009,JPO&INPIT
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