To provide a vehicle interior soundproof structure that can improve soundproof performance in a middle frequency band.SOLUTION: A vehicle interior soundproof structure comprises a partition member 12 as a main body that partitions a vehicle interior, a sound absorption layer 14 having a number of voids therein, a non-ventilation layer 30 made of non-ventilation materials and a compressed fiber layer 32A formed primarily of compressed fiber aggregate. Strength of adhesion between the compressed fiber layer 32A and the non-ventilation layer 30 is set lower than strength of adhesion between the non-ventilation layer 30 and the sound absorption layer 14, so that resonance caused by a resonance transmission phenomenon and resonance caused by extension of the sound absorption layer 14 cause antiresonance therebetween (refer to 10A), which can reduce insertion loss in a middle frequency band to improve soundproof performance in the middle-frequency band.SELECTED DRAWING: Figure 14
【課題】中周波数帯域の防音性能を向上させることが可能な乗物室防音構造を提供する。【解決手段】乗物室を区画する主体となる区画部材12と、内部に多数の空隙を有する吸音層14と、非通気性材料からなる非通気層30と、圧縮された繊維集合体を主体として形成された圧縮繊維層32Aと、を備えるものとし、圧縮繊維層32Aと非通気層30との接合強度が、非通気層30と吸音層14との接合強度より低くする。これにより、共鳴透過現象による共振と吸音層14の伸縮による共振とによって、それらの間で反共振が生じ(10A参照)、中周波数帯域における挿入損失を向上させ、中周波数帯域の防音性能を向上させることができる。【選択図】図14
VEHICLE INTERIOR SOUNDPROOF STRUCTURE
乗物室防音構造
2023-08-04
Patent
Electronic Resource
Japanese
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / 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 / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES |