| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of structural friction and friction due to secular deterioration by employing a simple composition. SOLUTION: An intake sound control device is equipped with at least two introduction pipes 3, 4 which can introduce air into an intake passage 5 of an internal combustion engine and with a negative pressure introducing passage 7 in which one end communicates with the intake passage 5, the other end is closed with an elastic body 11, and the inside pressure varies in accordance with intake flow velocity in the intake passage 5. The elastic body 11 is elastically deformed by a variation of pressure in the negative pressure introducing passage 7 so as to allow a change in a passage area of the introduction pipe 4. COPYRIGHT: (C)2006,JPO&NCIPI
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