JP2010052660A - Vehicle noise reduction structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle noise reduction structure capable of more further reducing noise of the vehicle. <P>SOLUTION: In the vehicle noise reduction structure 10, between a wheel 24 and a side member 26 in a vehicle width direction, a sound absorption wall 30 is arranged so as to be opposed to a vehicle width direction inner side surface 24A of the wheel 24 and a vehicle width direction. The sound absorption wall 30 is extended in a vehicle vertical direction such that its lower end part 30A is positioned at a lower side in a vehicle vertical direction relative to the side member 26. According to this constitution, since drive noise passing from an engine 22 through a lower side in a vehicle vertical direction relative to the side member 26 and released to an outer side in a vehicle width direction can be reduced by absorbing it by the sound absorption wall 30, the noise of the vehicle 12 can be more further reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle noise reduction structure.

Conventionally, the following is known as a vehicle noise reduction structure (for example, refer patent document 1). That is, in the example described in Patent Document 1, a fender liner is provided in the wheel house, and sound emitted outside the vehicle through the space between the wheel and the fender liner is reduced by using interference of sound waves. The structure to be made is provided.
JP 2004-168174 A (FIG. 5) Japanese Utility Model Publication No. 64-10442

  However, in the example described in Patent Document 1, no countermeasure is taken for noise that passes through the lower side in the vehicle vertical direction with respect to the side member. Therefore, there is room for improvement in order to further reduce the noise of the vehicle by reducing the noise passing through the lower side in the vehicle vertical direction with respect to the side member.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicle noise reduction structure that can further reduce vehicle noise.

  In order to solve the above-mentioned problem, the vehicle noise reduction structure according to claim 1 is disposed between a wheel and a side member in a vehicle width direction, and is arranged in the vehicle width direction inner side surface and the vehicle width direction of the wheel. A sound absorbing wall having a sound absorbing property is provided so as to be opposed to each other and extending in the vehicle vertical direction so that a lower end portion thereof is positioned below the side member in the vehicle vertical direction.

  According to the vehicle noise reduction structure of the first aspect, the sound absorbing wall is disposed between the wheel in the vehicle width direction and the side member so as to face the vehicle lateral surface in the vehicle width direction and the vehicle width direction. The sound absorbing wall extends in the vehicle vertical direction so that the lower end portion thereof is positioned on the vehicle vertical direction lower side with respect to the side member.

  Therefore, noise passing through the lower side in the vehicle vertical direction with respect to the side member can be reduced by absorbing the sound absorbing wall, so that the noise of the vehicle can be further reduced.

  A vehicle noise reduction structure according to a second aspect is the vehicle noise reduction structure according to the first aspect, wherein the sound absorbing wall is disposed outside the vehicle drive source in the vehicle width direction.

  According to the vehicle noise reduction structure according to the second aspect of the present invention, the drive noise that passes through the lower side in the vehicle vertical direction with respect to the side member from the drive source and is released to the outside in the vehicle width direction is reduced by being absorbed by the sound absorbing wall. be able to.

  A vehicle noise reduction structure according to a third aspect is the vehicle noise reduction structure according to the second aspect, wherein the vehicle noise reduction structure is arranged radially outward with respect to the wheel, and is opposed to a circumferential surface of the wheel and a radial direction of the wheel. And a fender liner that absorbs sound and is connected to be continuous with the sound absorbing wall, and is disposed on the vehicle vertical direction lower side with respect to the drive source, and is at least continuous with the sound absorbing wall. And an undercover having sound absorption properties.

  According to the vehicle noise reduction structure of the third aspect, since the fender liner and the sound absorbing wall are connected so as to be continuous, road noise generated when the wheels roll on the road surface is reduced. It can be effectively absorbed by the sound absorbing wall.

  Further, since the sound absorbing wall and the under cover are also connected so as to be continuous, the drive noise generated from the driving source can be effectively absorbed by the sound absorbing wall and the under cover.

  As described above in detail, according to the present invention, the noise of the vehicle can be further reduced.

  Hereinafter, an embodiment of a vehicle noise reduction structure of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a front portion of a vehicle 12 to which a vehicle noise reduction structure 10 according to an embodiment of the present invention is applied. FIG. 2 is a perspective view of the front portion of the vehicle 12. It is shown in the figure. Further, FIG. 3 shows a view in which the front portion of the vehicle 12 is cut along line 3-3 in FIG.

  Note that the arrow UP, arrow FR, and arrow OUT shown in these drawings respectively indicate the vehicle vertical direction upper side, the vehicle front-rear direction front side, and the vehicle width direction outer side (right side) of the vehicle 12.

  As shown in FIGS. 1 and 2, the vehicle 12 has an engine room 14 at the front. The engine room 14 includes a bumper cover 16, a fender panel 18, and a dash panel 20, and an engine 22 as a drive source is accommodated in the engine room 14.

  Further, as shown in FIG. 3, a side member 26 extending in the vehicle front-rear direction is provided on the outer side in the vehicle width direction with respect to the engine 22. 24 is provided.

  1 and 2, the vehicle noise reduction structure 10 is applied to the front portion of the vehicle 12, and includes a fender liner 28, a sound absorbing wall 30, a front under cover 32 as an under cover, The rear under cover 34 is provided.

  The fender liner 28 is formed in an arc shape along the peripheral surface of the wheel 24 described above, and is disposed radially outside the wheel 24 as shown in FIG. 24 are provided opposite to each other in the radial direction. The fender liner 28 is fixed to the fender panel 18 and the bumper cover 16.

  The sound absorbing wall 30 extends in the vehicle vertical direction and the vehicle width direction, and is configured integrally with the above-described fender liner 28 (connected to the fender liner 28 continuously). The sound absorbing wall 30 is disposed outside the engine 22 in the vehicle width direction and is disposed between the wheel 24 and the side member 26 in the vehicle width direction.

  The sound absorbing wall 30 is provided to face the vehicle width direction inner side surface 24A of the wheel 24 when the vehicle 12 is traveling straight, and the lower end portion 30A thereof is on the vehicle vertical direction lower side with respect to the side member 26. The vehicle extends in the vertical direction so as to be positioned.

  The front under cover 32 extends in the vehicle width direction and the vehicle front-rear direction, and is disposed on the vehicle vertical direction lower side with respect to the engine 22. As shown in FIGS. 1 and 2, both ends of the front under cover 32 in the vehicle width direction are connected to the above-described fender liner 28 and the sound absorbing wall 30.

  The rear under cover 34 is disposed on the rear side in the vehicle front-rear direction with respect to the front under cover 32, and is disposed on the vehicle vertical direction lower side with respect to the engine 22.

  In the present embodiment, the fender liner 28, the sound absorbing wall 30, the front under cover 32, and the rear under cover 34 are all made of a material having sound absorbing properties such as a nonwoven fabric.

  The front under cover 32 is fixed to the bumper cover 16 and a suspension member (not shown), and the rear under cover 34 is fixed to a suspension member (not shown).

  Next, the operation and effect of the vehicle noise reduction structure 10 according to one embodiment of the present invention will be described.

  First, in order to clarify the operation and effect of the vehicle noise reduction structure 10 according to an embodiment of the present invention, a vehicle noise reduction structure 110 according to a comparative example will be described. 8 is a cross-sectional view (a cross-sectional view similar to FIG. 3) of the vehicle 112 to which the vehicle noise reduction structure 110 according to the comparative example is applied.

  The vehicle noise reduction structure 110 according to this comparative example is configured such that the sound absorbing wall 30, the front under cover 32, and the rear under cover 34 are omitted from the vehicle noise reduction structure 10 according to the above-described embodiment of the present invention. ing.

  In the vehicle noise reduction structure 110 according to this comparative example, when the engine 22 is driven, the drive noise N1 generated from the engine 22 passes through the lower side in the vehicle vertical direction with respect to the side member 26 and is released to the outside in the vehicle width direction.

  Therefore, there is room for improvement in order to further reduce the noise of the vehicle 112 by reducing the drive noise N1 passing through the lower side of the side member 26 in the vertical direction of the vehicle.

  On the other hand, according to the vehicle noise reduction structure 10 according to the embodiment of the present invention, as shown in FIG. 3, the vehicle width of the wheel 24 is between the wheel 24 and the side member 26 in the vehicle width direction. A sound absorbing wall 30 is disposed opposite the inner side surface 24A in the vehicle width direction, and the sound absorbing wall 30 is arranged in the vehicle vertical direction so that its lower end 30A is located on the vehicle vertical direction lower side with respect to the side member 26. Has been extended.

  Therefore, the noise of the vehicle 12 can be reduced by absorbing the drive noise N1 that passes through the lower side in the vehicle vertical direction with respect to the side member 26 from the engine 22 and is released to the outside in the vehicle width direction by the sound absorbing wall 30. This can be further reduced.

  In addition, according to the vehicle noise reduction structure 10 according to the embodiment of the present invention, the fender liner 28 and the sound absorbing wall 30 are connected so as to be continuous, and therefore generated when the wheels 24 roll on the road surface. The road noise N2 thus obtained can be effectively absorbed by the fender liner 28 and the sound absorbing wall 30.

  Further, according to the vehicle noise reduction structure 10 according to one embodiment of the present invention, the front under cover 32 and the rear under cover 34 are arranged on the vehicle vertical direction lower side with respect to the engine 22. Therefore, the drive noise N3 generated from the engine 22 toward the lower side in the vehicle vertical direction can be absorbed by the front under cover 32 and the rear under cover 34, respectively.

  Further, since the sound absorbing wall 30 and the front under cover 32 are also connected continuously, the drive noises N1 and N3 generated from the engine 22 can be effectively absorbed by the sound absorbing wall 30 and the front under cover 32.

  In particular, according to the vehicle noise reduction structure 10 according to the embodiment of the present invention, the engine 22 is surrounded by the sound absorbing wall 30, the front under cover 32, and the rear under cover 34. , N3 as well as a sound absorption effect can be obtained.

  Further, according to the vehicle noise reduction structure 10 according to the embodiment of the present invention, the sound absorbing wall 30 is integrally formed with the arc-shaped fender liner 28 (so that the sound absorbing wall 30 is continuous with the fender liner 28). Therefore, the rigidity of the fender liner 28 can be improved. Moreover, the rigidity of the bumper cover 16 connected to the fender liner 28 can be improved by improving the rigidity of the fender liner 28.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited above, Of course, it can change and implement variously within the range which does not deviate from the main point. .

  For example, the vehicle noise reduction structure 10 according to one embodiment of the present invention may be configured as follows in addition to the above embodiment. 4 to 7 show modifications of the vehicle noise reduction structure 10 according to an embodiment of the present invention.

  That is, in the first modified example shown in FIGS. 4 and 5, the both ends of the rear under cover 34 in the vehicle width direction are connected to the sound absorbing wall 30 with respect to the above embodiment.

  With such a configuration, the pair of fender liners 28 are connected by the front under cover 32 and the rear under cover 34 as the under cover, so that the drive noise generated from the engine 22 downward in the vehicle vertical direction is generated. Sound absorption performance can be further improved, and the sound absorption performance can be improved in the front-rear direction of the engine 22. In addition, the effect of blocking drive noise generated from the engine 22 can be further improved.

  Further, in this case, as shown in FIG. 6, beads 38 may be formed at appropriate portions of the front under cover 32 and the rear under cover 34. Further, the bead 38 may be formed on the fender liner 28.

  If comprised in this way, the surface area of the front under cover 32, the rear under cover 34, and the fender liner 28 can be expanded, and sound absorption performance and sound insulation performance can be improved more.

  Although not shown, the bead 38 may be formed on the sound absorbing wall 30.

  Further, in the above embodiment and the above modification, the front under cover 32 and the rear under cover 34 are configured separately (configured separately in the vehicle front-rear direction), but as shown in FIG. 36 may be integrally configured (configured continuously in the vehicle longitudinal direction).

  Moreover, in the said embodiment, although the vehicle noise reduction structure 10 was applied to the front part of the vehicle by which the engine was mounted in the front part of the vehicle, the vehicle front part or vehicle in which the engine was mounted in the rear part of the vehicle It may be applied to the front part of a vehicle in which an engine is mounted at the center of the vehicle.

  Moreover, in the said embodiment, the vehicle noise reduction structure 10 may be applied to the rear part of the vehicle in which the engine was mounted in the front part of the vehicle, or the rear part of the vehicle in which the engine was mounted in the center part of the vehicle.

  Moreover, in the said embodiment, although the vehicle noise reduction structure 10 was applied to the vehicle 12 provided with the engine 22 (for example, internal combustion engines, such as a gasoline engine), the electric vehicle provided with the motor as a drive source, a drive You may apply to the hybrid vehicle provided with the engine and the motor as a source.

It is a top view which shows the front part of the vehicle to which the vehicle noise reduction structure which concerns on one Embodiment of this invention was applied. 1 is a perspective view showing a front portion of a vehicle to which a vehicle noise reduction structure according to an embodiment of the present invention is applied. It is sectional drawing which cut | disconnected the front part of the vehicle with which the vehicle noise reduction structure which concerns on one Embodiment of this invention was applied by the 3-3 line of FIG. It is a figure which shows the 1st modification of the vehicle noise reduction structure which concerns on one Embodiment of this invention. It is a figure which shows the 1st modification of the vehicle noise reduction structure which concerns on one Embodiment of this invention. It is a figure which shows the 2nd modification of the vehicle noise reduction structure which concerns on one Embodiment of this invention. It is a figure which shows the 3rd modification of the vehicle noise reduction structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the vehicle noise reduction structure which concerns on a comparative example.

Explanation of symbols

10 Vehicle noise reduction structure 22 Engine (drive source)
24 Wheel 24A Vehicle width direction inner side surface 26 Side member 28 Fender liner 30 Sound absorbing wall 30A Lower end 32 Front under cover 34 Rear under cover 36 Under cover

Claims (3)

  The vehicle is disposed between the wheel and the side member in the vehicle width direction, and is provided opposite to the vehicle width direction inner side surface of the wheel in the vehicle width direction, and a lower end portion thereof is below the side member in the vehicle vertical direction. A vehicle noise reduction structure including a sound absorbing wall extending in the vehicle vertical direction so as to be positioned on the side and having sound absorbing properties. The sound absorbing wall is disposed on the vehicle width direction outer side with respect to a vehicle drive source,
The vehicle noise reduction structure according to claim 1. A fender liner that is disposed on the outer side in the radial direction with respect to the wheel, is provided to face the circumferential surface of the wheel in the radial direction of the wheel, and is connected to the sound absorbing wall so as to be continuous with the sound absorbing wall. When,
An under cover that is disposed on the vehicle vertical direction lower side with respect to the drive source and connected to at least the sound absorbing wall and has a sound absorbing property;
With
The vehicle noise reduction structure according to claim 2.

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