| 摘要 |
PURPOSE: An intake noise damper is provided to reduce intake noise occurring during idling by making the pressure distribution of the intake air supplied to a surge tank uniform. CONSTITUTION: A guide pipe(10) is inserted into an outlet of a bypass passage(5) to directly supply air discharged via the guide pipe to the central portion of a surge tank(4). One outlet(11) of the guide pipe is placed in the central portion of the surge tank opposite to an engine. As the air supplied to the surge tank through the bypass passage is injected to the central portion of the surge tank, an explosive sound due to the collision of air to the side of the surge tank is avoided. As the outlet of the guide pipe faces to be opposite to the engine, the air discharged through the guide pipe is supplied to the engine after being injected opposite to the engine. Then, air is distributed over the entire area of the surge tank. Therefore, air pressure becomes uniform and noise occurring due to pressure difference is reduced.
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