To provide a sound insulating body for a vehicle which has a three-layer laminated structure with a middle sound insulation layer interposed between each sound absorption layer on one side and the other side, in which the other side sound absorption layer has a different volume density relatively to each part having a different thickness, and with which sound absorption performance and sound insulation performance may be appropriately exhibited entirely, and to provide a silencer for a vehicle.SOLUTION: A double sound insulation wall structure is composed of a dash panel 30 and a middle sound insulation layer 50. A three-layer laminated structure constituting a dash silencer DS has a thin-walled part side structure part and a thick-walled part side structure part. The thin-walled part side structure part is so formed that a gap between the double sound insulation wall structures is broad for enhancing the sound insulation performance. A thin-walled part side sound absorptive layer part at the other side is thinly formed with a large volume density so as to enhance the sound insulation performance. The thick-walled part side structure part is so formed that a gap between the double sound insulation wall structures is further broader for enhancing the sound insulation performance. A thick-walled part side sound absorptive layer part at the other side is formed to be further thicker than the thin-walled part side sound absorptive layer part with a small volume density so as to enhance the sound insulation performance.SELECTED DRAWING: Figure 3
【課題】一側及び他側の各吸音層の間に中側遮音層を介装してなる3層積層構造体を有し、互いに厚さを異にする各部位に対する他側吸音層の体積密度を異にして、全体にわたり、吸音性能及び遮音性能を適切に発揮する車両用防音体及び車両用サイレンサーを提供する。【解決手段】ダッシュパネル30及び中側遮音層50で構成される2重遮音壁構造体は、ダッシュサイレンサーDSを構成する3層積層構造体は薄肉部位側構造体部位及び厚肉部位側構造体部位を有する。薄肉部位側構造体部位は、2重遮音壁構造体の間隔を、遮音性能を高めるように広く形成し、他側の薄肉部位側吸音層部位を、遮音性能を高めるよう大きな体積密度で薄く形成する。厚肉部位側構造体部位は、2重遮音壁構造体の間隔を、遮音性能を高めるようにより一層広く形成し、他側の厚肉部位側吸音層部位を、吸音性能を高めるように小さな体積密度で薄肉部位側吸音層部位よりもより一層厚く形成する。【選択図】図3
SOUND INSULATING BODY FOR VEHICLE AND SILENCER FOR VEHICLE
車両用防音体及び車両用サイレンサー
2020-08-27
Patent
Electronic Resource
Japanese
SOUND INSULATION BODY FOR VEHICLE AND SILENCER FOR VEHICLE
European Patent Office | 2018
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