| 摘要 |
PROBLEM TO BE SOLVED: To provide a muffling chamber duct for enhancing the effect of reducing the sound of mid-frequency band while maintaining the effect of reducing the sound of high-frequency band. SOLUTION: This muffling chamber duct comprises pipes 11, 21, 31 built in an intake system 1 and having first holes 11a, 21a, 31a for escaping the sound in the intake system 1; and covers 13, 23, 33 so covering the pipes 11, 21, 31 that the sound can be attenuated and having second holes 13a, 23d, 33b. COPYRIGHT: (C)2009,JPO&INPIT
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