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Rail vehicle with sound-absorbing structure

A technology for rail vehicles and sound-absorbing parts, which is applied in the field of rail vehicles and can solve problems such as increased production costs

Inactive Publication Date: 2012-07-04
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, the production cost of the conventional comb-shaped sound-absorbing structure increases as the number of parts increases.

Method used

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  • Rail vehicle with sound-absorbing structure
  • Rail vehicle with sound-absorbing structure
  • Rail vehicle with sound-absorbing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a top view of a laminated sound-absorbing structure provided at an end portion constituting a wheel well in the first embodiment of the sound-absorbing structure of the present invention, figure 2 yes figure 1 The cross-sectional view of the laminated sound-absorbing structure shown ( figure 1 D-D sectional view in ). image 3 (a) and (b) represent respectively figure 1 and figure 2 A schematic diagram (cross-sectional view) of the laminated sound-absorbing structure shown and a graph of its sound-absorbing characteristics.

[0033] In the first embodiment, for the end portion 9, the first sound-absorbing member 15, the fixing member 50 having the top 50a, and the perforated plate 22a, and Figure 10 ~ Figure 12 The existing comb-shaped sound-absorbing structure 90 shown has the same structure, so their repeated descriptions are omitted (the same applies to the second and third embodiments). However, as the first sound absorbing member 15 and ...

Embodiment 2

[0038] Figure 4 (a) and (b) show Example 2 of the present invention. In Embodiment 2, between the first sound-absorbing member 15 and the second sound-absorbing member 20 whose periphery is held by the fixing member 50 provided on the frame 18, that is, the other side of the first sound-absorbing member 15 and one side of the second sound-absorbing member 20 An air layer 60 is provided in between. In this case, using the rigidity of the perforated plate 22b, the height of the side wall (in the direction perpendicular to the frame 18) of the perforated plate 22b formed into a cap shape by heightening the side wall is increased, and the second sound absorbing member is held by the perforated plate 22b. 20, thereby forming an air layer 60 between the first sound absorbing member 15 and the second sound absorbing member 20.

[0039] Compared with the laminated sound-absorbing structure shown in Example 1, the second embodiment is characterized in that the sound-absorbing member...

Embodiment 3

[0041] Figure 5 (a) and (b) show Example 3. In Example 3, the second sound-absorbing member 20 is erected to surround the peripheral edge of the flat-shaped first sound-absorbing member 15, that is, the corner column-shaped sound-absorbing member is provided with a protruding portion 20a protruding toward the top surface of the fixing member 50 on its peripheral edge. . The sound absorbing structure in which the air layer 60 is incorporated is formed by stacking the flat first sound absorbing material 15 and the second sound absorbing material 20 via the protruding portion 20a. Specifically, the perforated plate 22b formed into a hat shape by heightening the side wall is fixed to the top 50a of the fixing member 50 provided on the frame 18 by rivets or the like at its peripheral edge, and holds the second Sound-absorbing piece 20. The protruding portion 20a of the second sound absorbing material 20 contributes to the expansion of the surface area of ​​the sound absorbing m...

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PUM

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Abstract

A rail vehicle with sound-absorbing structure is capable of reducing production costs and increasing the acoustical absorptivity of the object. A second sound-absorbing part (20) is stacked on a first sound-absorbing part (15), the surface area of the sound-absorbing part receiving the noise produced in the wheel chamber under the floor corresponding to the circumference face of the second sound-absorbing part (20) is enlarged, top (50a) of a fixed part (50) nearby the enlarged surface area is taken as the reflect component of the sound to exert a function. Therefore, after the acoustic wave is reflected by the reflection component, the proportionality of the acoustic wave incident to the sound-absorbing part for sound absorption (attenuation) is augmented, the acoustical absorptivity of the band between f1 to f2 can be improved. In addition, the integral thickness (vertical height) of the sound-absorbing part opposite to the frame (18) as an acoustic source side of the rail vehicle is increased, to improve the acoustical absorptivity of the lower band. Increasing of the component number can be restrain as best as one can, the raise of production costs can be restrained at a minimum level, and the acoustical absorptivity of the frequency band as sound-absorbing object.

Description

technical field [0001] The present invention relates to rail vehicles (vehicles guided on rails such as railway vehicles, streetcars, monorail vehicles, and new transportation systems) having a sound-absorbing structure capable of suppressing noise generated from trolleys and various equipment. Background technique [0002] As an example of a conventional rail vehicle equipped with a sound-absorbing structure, there is Figure 8 ~ Figure 12 The straddle-type monorail vehicle shown. Figure 8 ~ Figure 12 It is a diagram showing the sound-absorbing structure of a straddle-type monorail vehicle and its sound-absorbing characteristics, Figure 8 It is a side view of a straddle-type monorail vehicle, Figure 9 cut with A-A Figure 8 A cross-sectional view of the trolley portion of the straddle-type monorail vehicle shown, Figure 10 cut with B-B Figure 8 The cross-sectional view of the straddle-type monorail vehicle shown is the front view with respect to the end, Figure 11...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R13/08B61D49/00
CPCB60Y2200/30B61B13/06B61D49/00B62D25/00E01F8/00E04B1/84G10K11/16G10K2210/1283
Inventor 濑畑美智夫山本久寿国本淳一
Owner HITACHI LTD