A dash insulator is constructed by layering a front layer, a sound absorption layer of a membrane-vibration type and a perforated sound insulation layer. A layered body of the sound absorption layer and the perforated sound insulation layer is constructed such that the inner diameter and the opening ratio of opening portions of the perforated sound insulation layer are set to enable suppression of a resonance phenomenon between vibrations of the sound absorption layer and the perforated sound insulation layer in relation to low frequency range noise components of noise.
Soundproof body and insulator for motor vehicles
2015-09-01
Patent
Electronic Resource
English
IPC: | E04B Allgemeine Baukonstruktionen , GENERAL BUILDING CONSTRUCTIONS / B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / F02B INTERNAL-COMBUSTION PISTON ENGINES , Brennkraftmaschinen mit innerer Verbrennung mit Verdrängerwirkung / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES |
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