To reduce a noise of approximately 500 to 2,000 Hz generated by traveling of a vehicle such as an electric vehicle.SOLUTION: A silencer includes a fiber structure layer contacting the surface of a panel, and a surface layer having a non-permeable sound insulation layer bonded to the fiber structure layer. A basis weight of the surface layer is 250 to 2,000 g/m2. A basis weight of the fiber structure layer is 400 to 1,200 g/m2. Thickness of the fiber structure layer is 8 to 25 mm. In a graph with a 1/3 octave band center frequency f (Hz) as an abscissa axis in a logarithmic scale, and an insertion loss IL (dB) as an ordinate axis, specific points (fs, ILs) convex upward are included in a plurality of points (f, IL) connected by a folded line; a straight line L1 is brought into contact with first peripheral points (fa, ILa) and second peripheral points (fb, ILb) convex downward in the folded line so as to satisfy fa

    【課題】電気自動車といった車両の走行により発生する500~2000Hz程度の騒音を低減させる。【解決手段】サイレンサーは、パネルの表面に接する繊維構造層、繊維構造層に接着した非通気性の遮音層を有する表層を含む。表層の目付は250~2000g/m2であり、繊維構造層の目付は400~1200g/m2であり、繊維構造層の厚さは8~25mmである。1/3オクターブバンド中心周波数f(Hz)を対数目盛の横軸とし挿入損失IL(dB)を縦軸としたグラフにおいて、折れ線で結ばれる複数の点(f,IL)に上に凸である特定点(fs,ILs)が含まれ、fa<fs<fbとして折れ線において下に凸である第一周囲点(fa,ILa)及び第二周囲点(fb,ILb)で直線L1が接し、直線L1上の基準点(fs,ILc)と特定点(fs,ILs)との距離ILs-ILcが4.5dB以上であり、fsが500~2000Hzの間にある。【選択図】図4


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    Title :

    SILENCER FOR VEHICLE


    Additional title:

    車両用サイレンサー


    Contributors:

    Publication date :

    2024-10-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES



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