초록 ▼

A soundproofing material 10 is applied to a vehicle hood panel 14 on the side facing the engine compartment. The soundproofing material 10 as a whole has a sheet-like form and includes a pulverized rubber layer 11 containing rubber grains of various kinds of material, various sizes and various shape

A soundproofing material 10 is applied to a vehicle hood panel 14 on the side facing the engine compartment. The soundproofing material 10 as a whole has a sheet-like form and includes a pulverized rubber layer 11 containing rubber grains of various kinds of material, various sizes and various shapes and covering layers 12 which cover the pulverized rubber layer 11. Noises are absorbed topically by a number of rubber grains within the soundproofing material 10 and by air gaps present between the rubber grains. While noise generating sources such as an engine, an induction system unit, transmissions and so on are housed in the engine compartment, noises ranging over a plurality of wavelength are generated by them yet are absorbed by the pulverized rubber layer 11, because the pulverized rubber layer 11 contains a mixture of rubber grains of various kinds, various sizes and various shapes, and the frequency level of the noise to be absorbed by each rubber grain is different piece by piece.

대표청구항 ▼

[ What is claimed is:] [1.] A soundproofing insulator interposed between a source of noise and a member for supporting the insulator to limit propagation of noise from the source to the support member, the soundproofing insulator comprising:a multiplicity of elastic grains for absorbing the noise tr

[ What is claimed is:] [1.] A soundproofing insulator interposed between a source of noise and a member for supporting the insulator to limit propagation of noise from the source to the support member, the soundproofing insulator comprising:a multiplicity of elastic grains for absorbing the noise transmitted from the noise source;a housing enclosing the elastic grains, the housing having a first layer wall contacting the support member and a second layer wall facing the noise source,the second layer wall including a plurality of through holes having a diameter smaller than a minimum dimension of each elastic grain whose passage is to be prevented; anda plurality of air pockets defined between the first layer and the support member.