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Noise absorbing structure and noise absorbing/insulating structure

a technology of noise absorption and noise insulation, applied in the direction of instruments, flooring, transportation and packaging, etc., can solve the problem that the noise absorption effect based on the helmholtz resonance principle cannot be shown sufficiently, and achieve the effect of effective noise absorption and wide frequency rang

Inactive Publication Date: 2005-05-12
TOYODA GOSEI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention provides a noise absorbing structure and a noise absorbing / insulating structure capable of effectively absorbing noise in a wide frequency range.

Problems solved by technology

Also, as for the noise-insulating board described above, since it is difficult to enlarge the volume of space in the cylindrical hollow bodies, the noise absorbing effect based on the Helmholtz resonance principle cannot be exhibited sufficiently.

Method used

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  • Noise absorbing structure and noise absorbing/insulating structure
  • Noise absorbing structure and noise absorbing/insulating structure
  • Noise absorbing structure and noise absorbing/insulating structure

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0039] A first embodiment of a noise absorbing / insulating structure according to the present invention will now be described with reference to FIG. 1 through FIG. 5. The noise absorbing / insulating structure of the first embodiment is installed in a console 111, which is an interior equipment of a vehicle.

[0040] As shown in FIG. 1, the console 111 is arranged between the driver's seat and passenger seat in the passenger compartment. Drive train components (not shown) including the engine and gears are mounted in the front lower part of the vehicle. Various kinds of noise, generated by the drive train components, are propagated through the inner space of the console 111 and leak into the passenger compartment through gaps thereby creating the noise in the passenger compartment. Two noise absorbing / insulating boxes 112 are installed inside the console 111 as noise absorbing bodies for reducing the passenger compartment noise. The two noise absorbing / insulating boxes 112 form a noise a...

second embodiment

[0060] Hereafter, a noise absorbing / insulating box 132 according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view of the noise absorbing / insulating box 132, and FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 6.

[0061] As shown in FIG. 6 and FIG. 7, the noise absorbing / insulating box 132 includes first and second noise absorbing / insulating sub-boxes 132a and 132b, which are assembled integrally with each other. The volumes in the first and second noise absorbing / insulating sub-boxes 132a and 132b are the same. The noise absorbing / insulating box 132 is thin and has a rectangular box shape formed by joining the side of the first noise absorbing / insulating sub-box 132a with the side of the second noise absorbing / insulating sub-box 132b.

[0062] In the noise absorbing / insulating box 132 of the second embodiment, the first noise absorbing / insulating sub-box 132a is constructed as a first noise abs...

third embodiment

[0067] A noise absorbing / insulating box 212 according to a third embodiment of the present invention will now be described with reference to FIGS. 8 to 11. In the third embodiment, the noise absorbing / insulating box 212 has a step-like shape as shown in FIG. 10 and is installed in a console 111 as shown in FIGS. 8 and 9.

[0068] As shown in FIGS. 10 and 11, the noise absorbing / insulating box 212 has a first noise absorbing portion 226a, a second noise absorbing portion 226b, and a third noise absorbing portion 226c, which are hollow and are partitioned from each other by first and second partition walls 225a and 225b that link a first wall 221 and a second wall 222. In other words, the noise absorbing / insulating box 212 of the third embodiment is constituted by integrating the first, second, and third noise absorbing portions 226a, 226b, and 226c, each of which has a rectangular box shape. The first wall 221 is formed to have a step-like shape as a whole. The first and second partiti...

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Abstract

A noise absorbing structure for effectively absorbing noise in a wide frequency range includes a first noise absorbing portion that is hollow and includes one or more first holes. The structure further includes a second noise absorbing portion that is hollow and includes one or more second holes. The total area of the one or more first holes differs from the total area of the one or more second holes.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a noise absorbing structure and a noise absorbing / insulating structure for absorbing noise, and more particularly, to a noise absorbing structure and a noise absorbing / insulating structure for absorbing noise in the passenger compartment of a vehicle. [0002] In recent years, there has been an increasing demand for quietness in the passenger compartment of a vehicle. Accordingly, it is required that noise be further reduced in the passenger compartment. As a measure for reducing the noise, there has been proposed a noise absorbing structure, which includes a base with a plurality of holes (noise absorbing wall) and a space provided at the back of the base. This type of noise absorbing structure exhibits its noise absorbing effect based on the Helmholtz resonance principle when noise generated by a noise source passes through the holes formed in the noise absorbing wall. The sonic energy is absorbed rapidly by this no...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60R13/08E04B1/84G10K11/172
CPCB60R13/0815G10K11/172E04B2001/8485
Inventor SATO, TAKAHIKOHIROSE, YOSHIKAZUYAMADA, AKIHITOINOUE, TOMOKAZUYAMAUCHI, AKIRAYABUYA, SHIGERUISHIDUKA, MASAKI
Owner TOYODA GOSEI CO LTD
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