PROBLEM TO BE SOLVED: To provide a sound insulation structure of an automobile 1 which can suppress a permeation sound permeating into a vehicle by a simple constitution which is suppressed in an increase of the number of part items.SOLUTION: In the sound insulation structure of the automobile 1 having a sound absorption member 7 interposed between a vehicle body bottom part 2 and a floor carpet 8 of the automobile 1, the vehicle body bottom part 2 is constituted of a sound insulation performance non-advantageous portion X1 which is not advantageous to the permeation of vehicle-outside noise, and a sound insulation performance advantageous portion Y1 which adjoins a periphery of the sound insulation performance non-advantageous portion X1, and is advantageous in sound insulation performance compared with the sound insulation performance non-advantageous portion X1. Between the vehicle body bottom part 2 and the floor carpet 8, provided are a sound absorption member 7 arranged between the sound insulation non-advantageous portion X1 and the floor carpet 8, a cross member 5 connecting the sound insulation performance advantageous portion Y1 and the floor carpet 8 and substantially sealing a clearance between the vehicle body bottom part 2 and the floor carpet 8, and a sound insulation space S2 which adjoins the sound absorption member 7 and the cross member 5, and is surrounded by the sound absorption member 7 and the cross member 5.SELECTED DRAWING: Figure 2
【課題】部品点数の増加を抑えた簡素な構成で、車内へ透過する透過音を抑制できる自動車1の遮音構造を提供することを目的とする。【解決手段】自動車1の車体底部2とフロアカーペット8との間に介在する吸音部材7とを備えた自動車1の遮音構造であって、車体底部2が、車外騒音の透過に対して不利な遮音性不利部分X1と、遮音性不利部分X1の周囲に隣接するとともに、遮音性不利部分X1に比べて遮音性が有利な遮音性有利部分Y1とで構成され、車体底部2とフロアカーペット8との間に、遮音性不利部分X1、及びフロアカーペット8の間に配置した吸音部材7と、遮音性有利部分Y1、及びフロアカーペット8を連結するとともに、車体底部2、及びフロアカーペット8の間を略密閉するクロスメンバ5と、吸音部材7、及びクロスメンバ5に隣接するとともに、吸音部材7、及びクロスメンバ5で包囲された遮音空間S2とを備えたことを特徴とする。【選択図】図2
SOUND INSULATION STRUCTURE OF AUTOMOBILE
自動車の遮音構造
2017-09-14
Patent
Electronic Resource
Japanese
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