To reduce the engine sound that leaks to the lateral side of a vehicle.SOLUTION: A noise reflector 10 is attached to a lower surface of a front side member 20. A sound reflection surface 11A of the noise reflector 10 is arranged so as to face a side opening 92C formed on the lateral side of an engine room 91. With this configuration, a portion of the engine sound heading toward the lateral side from the side opening 92C is reflected on the sound reflection surface 11A to head toward the lower side, and overlaps and interferes with the engine sound that advances straight toward the lateral side from the side opening 92C on the lower side with respect to the noise reflection part 10 in a phase-deviating state.SELECTED DRAWING: Figure 1
【課題】車両の側方に漏れるエンジン音を低減する。【解決手段】本実施形態では、騒音反射器10が、フロントサイドメンバー20の下面に取り付けられて、騒音反射器10が有する音反射面11Aが、エンジンルーム91の側方に形成された側部開口92Cに臨むように配置された構造となっている。これにより、側部開口92Cから側方へ向かうエンジン音の一部が、音反射面11Aで反射して下方に向かい、騒音反射部10より下側で側部開口92Cから側方に真っ直ぐ進んだエンジン音と位相がずれた状態で交わって干渉する。【選択図】図1
NOISE REDUCTION STRUCTURE AND NOISE REDUCTION METHOD
消音構造及び消音方法
2021-12-13
Patent
Electronic Resource
Japanese
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