PROBLEM TO BE SOLVED: To achieve high sound insulation while avoiding grommet swelling.SOLUTION: An elastic material-made grommet body 10 has a large diameter cylindrical part 11 fitting to the through-hole Pa of a panel P, the small diameter cylindrical parts 13, 14 tightly fitting to the outer periphery of an electric wire W, and two annular connected shield walls 15, 16 shielding the annular space between the large and small diameter cylindrical parts to define an air chamber R. A flask-shaped resonance type muffler 30 in which a spherical part 33 protrudes outside from the grommet body is retrofitted to the fitting cylindrical part 20 of the elastic material-made grommet body. Thereby, sound elimination performance is enhanced by the capacity change of a resonance chamber 34 in the spherical part 33 and the like to improve a sound insulation.SELECTED DRAWING: Figure 1
【課題】グロメットの肥大化を避けながら、高い遮音性を実現する。【解決手段】パネルPの貫通孔Paに嵌合する大径筒部11と、電線Wの外周に密着嵌合する小径筒部13、14と、大径筒部と各小径筒部との間の環状の空間を遮蔽し空気室Rを画成する2つの環状の連結遮蔽壁15、16と、を有する弾性材料製のグロメット本体10の装着筒部20に、グロメット本体から外部に球体部33が突出するフラスコ形状の共鳴型消音器30を後付けで装着し、球体部33内の共鳴室34の容量等で消音性能を高めて遮音性を向上させる。【選択図】図1
GROMMET
グロメット
2016-09-05
Patent
Electronic Resource
Japanese
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H02G INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES , Verlegen oder Installieren elektrischer Kabel oder Leitungen, Verlegen oder Installieren kombinierter optischer und elektrischer Kabel oder Leitungen |
GROMMET INNER, GROMMET, AND FIXED CONSTRUCTION OF GROMMET
European Patent Office | 2019
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