PROBLEM TO BE SOLVED: To satisfy both acoustic insulation property and weight reduction, by further properly setting surface density of a sound absorption material, by taking into consideration a difference in particle speeds in a plane of a floor panel.SOLUTION: A sound absorption material 17 is arranged in a space K between a floor panel 1 becoming an incident side of road noise as noise and a floor carpet 16 arranged above the floor panel. In the floor panel 1, a floor area F1 (for example, an installation area of a rear seat) enclosed by a strength member is partitioned into a square panel area P1 and the other area P2 by, for example, a bead part 18 for constituting a node of vibration. The sound absorption material 17 in the panel area P1 has a high density area M1 and a low density area M2 in a plan view (in a plane of the panel area).SELECTED DRAWING: Figure 9
【課題】フロアパネルの面内における粒子速度の相違を勘案して、吸音材の面密度をより適正に設定して、遮音性と軽量化とを共に満足できるようにする。【解決手段】騒音としてのロードノイズの入射側となるフロアパネル1とこの上方に配設されたフロアカーペット16との間の空間Kに、吸音材17が配設される。フロアパネル1のうち、強度部材で囲まれたフロア領域F1(例えば後席の設置領域)が、振動の節を構成する例えばビード部18によって、正方形のパネル領域P1と他の領域P2とに区画される。パネル領域P1における吸音材17が、平面視において(パネル領域の面内において)、高密度領域M1と低密度領域M2とを有している。【選択図】 図9
SOUND INSULATION STRUCTURE OF VEHICLE FLOOR
車両フロアの遮音構造
2018-04-26
Patent
Electronic Resource
Japanese
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