JP7098404B2 - Fender soundproof material and fender soundproof structure - Google Patents

Description

The present invention relates to a fender soundproofing material and a fender soundproofing structure disposed on a fender of an automobile.

Generally, an automobile fender is composed of a tire house cover that forms a tire arrangement space in which tires are arranged, a fender panel that is an outer panel of a vehicle body, a vehicle body panel that forms a vehicle body frame, and the like. It is hollow.

Patent Document 1 discloses that an insulator for preventing hot air or the like in the engine room from flowing into the vehicle interior is arranged inside the fender. The insulator has an insulator main body formed into a plate shape by polypropylene or the like, and a clip fixed to the vehicle body panel, and the clip is provided on the insulator main body via a broken portion.

Patent Document 2 discloses that an acoustic hole portion of a Helmholtz type resonator is formed in a resin foam material formed by heat foaming, and this member is arranged in a fender portion.

Japanese Unexamined Patent Publication No. 2007-90999 Japanese Unexamined Patent Application Publication No. 2003-140569

By the way, since the fender and the tire arrangement space are adjacent to each other, road noise and pattern noise in the tire arrangement space can easily enter the inside of the fender, and since the fender and the engine room are adjacent to each other, the engine The sound of the power train such as, etc. can easily enter the inside of the fender.

Therefore, by arranging the members disclosed in Patent Documents 1 and 2 inside the fender, it is conceivable to suppress the intrusion of sound into the vehicle interior side. That is, since the insulator of Patent Document 1 is provided with an insulator main body made of a resin plate, it is considered that the insulator main body can obtain sound insulation particularly against sound entering from the front of the vehicle, but basically the inside of the fender is Since it is a closed space, it is not possible to reduce the sound reverberated in the closed space simply by arranging the insulator body made of a resin plate as in Patent Document 1, and the quietness in the vehicle interior is sufficiently enhanced. It is difficult.

On the other hand, by arranging the sound absorbing foam plastic having the Helmholtz type resonator of Patent Document 2 in the fender portion, the energy of the sound in the closed space can be converted into the heat energy by the Helmholtz type resonator, so that the passenger interior can be converted into heat energy. It is thought that the quietness of the

However, in recent years, there has been a strong demand for further improvement in quietness in the vehicle interior, and there is a demand for further improvement in the noise reduction effect in the fender. Therefore, when the inventor of the present application verified the Helmholtz type resonator disposed in the fender, it is difficult to obtain the required quietness only by disposing the Helmholtz type resonator in the fender, and the Helmholtz type resonator in the fender is difficult to obtain. It was found that the noise reduction effect of the Helmholtz type resonator changes greatly depending on the orientation of the holes in the resonator.

Further, in recent automobiles, from the viewpoint of pedestrian protection, a structure that absorbs an impact by deformation when an obstacle collides with a fender is adopted. Assuming such a shock absorbing structure, by providing a clip via a broken portion as in Patent Document 1, the clip is broken when an obstacle collides, and the insulator main body is separated from the vehicle body. However, since the insulator body is a resin plate and has a structure having a plurality of ribs extending vertically and horizontally, it is difficult to be deformed, and there is room for further study to improve the impact absorption.

The present invention has been made in view of this point, and an object of the present invention is to further enhance the noise reduction effect in the fender while improving the impact absorption at the time of collision with an obstacle. It is to improve the quietness of the car.

In order to achieve the above object, the first invention is a fender soundproofing material disposed in an automobile fender, wherein the fender soundproofing material has an outer wall portion and a cavity portion surrounded by the outer wall portion. A plurality of holes are arranged in the middle portion of the fender in the traveling direction of the automobile, and the outer wall portion is opened in the direction opposite to the traveling direction of the automobile and communicates with the cavity portion, and the fender. A deformation-inducing portion that induces deformation of the outer wall portion by an impact applied from the outside to the soundproof material is provided , and the outer wall portion includes a front wall portion that extends in the vertical direction and the traveling of the automobile from the front wall portion. It has a rear wall portion that extends in the vertical direction away from the direction and is arranged so as to face a region having a higher wind velocity upward than the region facing the front wall portion in the fender. It is characterized in that a plurality of the holes are provided in the wall portion .

According to this configuration, the fender soundproofing material is arranged in the middle portion of the fender of the automobile in the traveling direction of the automobile. Since the outer wall of the Fender soundproofing material is provided with a plurality of holes communicating with the cavity, sound waves in the fender enter the cavity from each hole and cause a resonance phenomenon in the cavity, which causes sound. Energy is converted into heat energy to obtain a sound absorbing effect. At this time, since each hole is opened in the direction opposite to the traveling direction of the automobile, as shown in the graph of FIG. 6, as compared with the case where the holes are opened in the traveling direction of the automobile (Comparative Example 1). , The sound absorption effect of noise in the 400 Hz to 800 Hz band is enhanced.

Further, for example, when an obstacle collides with a fender, the fender may be positively deformed to absorb the impact in recent automobiles. In the case of such a structure, an external impact may be applied to the fender soundproofing material when colliding with an obstacle. In the present invention, when an impact is applied to the fender soundproof material from the outside, the deformation-inducing portion induces the deformation of the outer wall portion, and the deformation of the outer wall portion absorbs the impact. At this time, since the outer wall portion is a portion surrounding the cavity portion, the deformation of the outer wall portion is not hindered, and the desired impact absorption can be obtained .

In addition , since the rear wall of the fender soundproofing material extends in the vertical direction, it is possible to provide a large number of holes that open in the direction opposite to the traveling direction of the automobile, and the degree of freedom in setting the diameter and position of the holes is increased. Improve .

According to the second aspect of the present invention, in the fender soundproofing structure of an automobile, a fender soundproofing material having an outer wall portion and a cavity portion surrounded by the outer wall portion is disposed in an intermediate portion in the traveling direction of the automobile in the fender. The outer wall portion is deformed by a plurality of holes that open in the direction opposite to the traveling direction of the automobile and communicate with the cavity portion, and an impact applied from the outside to the fender soundproofing material. It is characterized in that a deformation-inducing portion for inducing is provided.

According to this configuration, as in the first invention, the sound absorbing effect is enhanced and the impact absorption as intended can be obtained.

Further , the fender soundproofing material is formed in a plate shape extending in the vertical direction, and is characterized in that the outside in the vehicle width direction is arranged so as to be located on the front side of the vehicle as compared with the inside.

According to this configuration, the outside of the fender soundproofing material in the vehicle width direction is located on the front side of the vehicle compared to the inside, so that when the fender soundproofing material is arranged parallel to the vehicle width direction, or the vehicle of the fender soundproofing material. The noise is further reduced as compared with the case where the outside in the width direction is located on the rear side of the automobile as compared with the inside.

According to the first and second inventions, the outer wall of the fender soundproofing material is provided with a plurality of holes that open in the direction opposite to the traveling direction of the automobile and communicate with the cavity, so that the noise reduction effect in the fender can be achieved. It can be further enhanced and the quietness in the vehicle interior can be improved. In addition, when an impact is applied to the fender soundproof material from the outside, deformation of the outer wall portion can be induced to obtain the desired impact absorption.

In addition , since the rear wall of the fender soundproofing material extends in the vertical direction, it is possible to provide a large number of holes that open in the direction opposite to the traveling direction of the automobile, and the degree of freedom in setting the diameter and position of the holes is improved. Can be made to .

Further , since the outside of the fender soundproofing material in the vehicle width direction is located on the front side of the automobile as compared with the inside, noise can be further reduced.

It is a perspective view which looked at the front side of the automobile provided with the fender soundproof structure which concerns on embodiment of this invention from above. FIG. 3 is a sectional view taken along line AA in FIG. FIG. 2 is a sectional view taken along line BB in FIG. It is a perspective view which looked at the fender soundproofing material which concerns on embodiment from the rear side. It is a graph which shows the wind speed of the front side and the rear side in a fender. It is a graph which shows the change of the sound absorption performance by the presence or absence of a hole, and the difference in the opening direction of a hole. It is a top view which shows the posture of a fender soundproof material. It is a graph which shows the change of the sound absorption performance by the difference of the posture of a fender soundproof material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

FIG. 1 is a perspective view of the front side of an automobile 100 provided with a fender soundproof structure 1 according to an embodiment of the present invention as viewed from above. The automobile 100 is a passenger car having an engine room E in which an engine, a transmission and the like (not shown) are housed on the front side, and a passenger car R having a passenger compartment R behind the engine room E. For example, a traveling motor or the like may be housed in the engine room E. A dash panel (not shown) is provided between the engine room E and the vehicle interior R, and the engine room E and the vehicle interior R are separated by a dash panel. The engine room E is covered from above by the bonnet hood 101. Further, a bumper 102, a headlight 103, a front grill 104, and the like are provided at the front end of the automobile 100. Further, reference numeral 105 is a tire (wheel) of the automobile 100.

In the description of this embodiment, "front" means the front side in the vehicle front-rear direction, "rear" means the rear side in the vehicle front-rear direction, and "left" means the left side in the vehicle left-right direction. "Right" means the right side in the left-right direction of the vehicle. The left-right direction of the vehicle is the width direction of the vehicle.

(Composition of fender)
A left front fender 110 and a right front fender 111 are provided on the left side and the right side of the engine room E of the automobile 100, respectively. Since the left front fender 110 and the right front fender 111 have a symmetrical structure, the structure of the left front fender 110 will be described in detail below.

As shown in FIG. 2, the left front fender 110 includes a tire house cover 112 forming a tire arrangement space S in which the tire 105 is arranged, a fender panel 113, and a vehicle body panel 114, and the left front fender 110 is provided. The inside of the fender 110 is hollow. Reference numeral F indicates the internal space of the left front fender 110.

The tire house cover 112 is made of, for example, a resin material, and is a plate-shaped member that is curved so as to open downward so as to correspond to the outer shape of the tire 105. The tire arrangement space S is located below the tire house cover 112, and the tire 105 rotates in the tire arrangement space S when the automobile 100 is running. The tire arrangement space S and the internal space F of the left front fender 110 are partitioned by the tire house cover 112, and the tire arrangement space S and the internal space F of the left front fender 110 are extremely close to each other. It is a relationship. Therefore, noise in the tire arrangement space S, for example, pattern noise and road noise generated when the tire 105 rotates, easily enters the internal space F of the left front fender 110.

The fender panel 113 is a member that forms an outer plate of a vehicle body, and is made of a metal plate, a resin plate, or the like. The shape of the fender panel 113 differs depending on the vehicle, but generally, as shown in FIG. 1, the fender panel 113 is formed so as to correspond to the outer shape of the tire 105 when viewed from the side of the automobile 100, and is a tire arrangement space. The tire 105 in S faces the outside. As shown in the cross-sectional view in FIG. 2, the fender panel 113 is curved so as to be located inward in the vehicle width direction toward the upper side thereof. Since the fender panel 113 has such a shape, the dimension of the internal space F of the left front fender 110 in the vehicle width direction is the longest on the lower side and narrower toward the upper side.

The vehicle body panel 114 is, for example, a member that forms a vehicle body frame or the like, and is made of a metal plate or the like. The vehicle body panel 114 is separated from the inner surface of the lower portion of the fender panel 113 inward in the vehicle width direction. The engine room E is located inside the vehicle body panel 114 in the vehicle width direction, and the engine room E and the internal space F of the left front fender 110 are in an extremely close positional relationship. Therefore, noise in the engine room E, for example, engine noise, easily enters the internal space F of the left front fender 110.

The left front fender 110 has a shock absorbing structure. That is, when an obstacle collides with the left front fender 110, the fender panel 113 mainly absorbs the impact by deforming to the internal space F side.

(Fender soundproof structure)
The left front fender 110 and the right front fender 111 have a fender soundproof structure 1. Since the fender soundproof structure 1 of the left front fender 110 and the fender soundproof structure (not shown) of the right front fender 111 have a symmetrical structure, the fender soundproof structure 1 of the left front fender 110 will be described below.

As shown in FIG. 1, the fender soundproof structure 1 includes a fender soundproof material 10 arranged in the internal space F of the left front fender 110. The fender soundproofing material 10 is arranged at the intermediate portion in the traveling direction of the automobile 100 in the internal space F of the left front fender 110. Since the traveling direction of the automobile 100 and the front direction coincide with each other, the fender soundproofing material 10 is arranged in the middle portion in the front-rear direction of the internal space F of the left front fender 110. Therefore, the internal space F of the left front fender 110 exists on the front side of the fender soundproofing material 10, and the internal space F of the left front fender 110 also exists on the rear side of the fender soundproofing material 10.

As shown in FIGS. 3 and 4, the fender soundproofing material 10 has an outer wall portion 11 and a cavity portion 12 surrounded by the outer wall portion 11, and as shown in FIG. 2, the fender soundproofing material 10 as a whole has a vertical direction and a vertical direction. It is formed in the shape of a plate extending in the left-right direction. The upper edge portion of the fender soundproofing material 10 and the outer edge portion in the vehicle width direction are formed along the inner surface of the fender panel 113, and most of the upper edge portion and the outer edge portion in the vehicle width direction of the fender soundproofing material 10 are fender panels. It is in contact with the inner surface of 113. The lower edge portion of the fender soundproofing material 10 is formed so as to extend substantially along the upper surface of the tire house cover 112 in the vehicle width direction, and is in contact with the upper surface of the tire house cover 112. The inner edge portion of the fender soundproofing material 10 in the vehicle width direction is formed along the vehicle body panel 114 and is in contact with the vehicle body panel 114. An elastic material such as urethane foam can be provided at the contact portion with the fender panel 113, the contact portion with the tire house cover 112, and the contact portion with the vehicle body panel 114 in the fender soundproof material 10. As a result, it is possible to prevent abnormal noise when the automobile 100 is running, and it is possible to improve the sound insulation.

Since the fender soundproofing material 10 is formed in a plate shape extending in the vertical direction and the horizontal direction, and each edge is formed so as to be in contact with the fender panel 113, the tire house cover 112, and the vehicle body panel 114, the left front fender The internal space F of the 110 can be partitioned in the front-rear direction by the fender soundproofing material 10. As a result, the noise on the front side of the fender soundproofing material 10 is less likely to reach the rear side, that is, the vehicle interior R side.

Next, the difference in wind speed between the front side and the rear side of the fender soundproofing material 10 in the internal space F of the left front fender 110 will be described. In measuring the wind speed, as shown in FIG. 1, an anemometer V1 is installed in front of the fender soundproofing material 10 in the internal space F of the left front fender 110, and the fender soundproofing material 10 in the internal space F of the left front fender 110. Anemometer V2 is installed behind. Then, when the automobile 100 is driven at a speed of 100 km / h, an air flow toward the rear side is mainly generated on the front side of the fender soundproofing material 10 in the internal space F of the left front fender 110 as shown by the arrow C. On the rear side of the fender soundproofing material 10 in the internal space F of the left front fender 110, an upward air flow is mainly generated as shown by the arrow D. As shown in FIG. 5, the wind speed in the C direction was 2.0 m / s, whereas the wind speed in the D direction was 5.1 m / s. That is, the upward wind speed generated behind the fender soundproofing material 10 in the internal space F of the left front fender 110 is the backward wind speed generated behind the fender soundproofing material 10 in the internal space F of the left front fender 110. It is more than double.

(Detailed structure of fender soundproofing material)
The outer wall portion 11 of the fender soundproofing material 10 is formed of, for example, polypropylene (PP), a resin material obtained by adding an additive to polypropylene, or a hard resin such as ABS resin. As shown in FIG. 3 and the like, the outer wall portion 11 has a front wall portion 11a extending in the vertical direction and a rear wall extending in the vertical direction away from the front wall portion 11a in the direction opposite to the traveling direction (rear) of the automobile 100. A portion 11b and a peripheral wall portion 11c are provided. The front wall portion 11a and the rear wall portion 11b extend from the inner surface of the fender panel 113 until they reach the vehicle body panel 114, and extend until they reach the tire house cover 112.

The front wall portion 11a and the rear wall portion 11b may or may not be parallel to each other. The peripheral wall portion 11c extends from the peripheral edge portion of the front wall portion 11a to the peripheral edge portion of the rear wall portion 11b. The elastic material such as urethane foam described above can be provided on the outer surface of the peripheral wall portion 11c. Further, the cavity portion 12 is a portion surrounded by the front wall portion 11a, the rear wall portion 11b, and the peripheral wall portion 11c.

As shown in FIG. 4, a mounting plate portion 13 is provided inside the outer wall portion 11 in the vehicle width direction. A protrusion 13a is formed on the mounting plate portion 13. By inserting the protrusion 13a into an opening (not shown) provided in the vehicle body panel 114, the fender soundproofing material 10 can be fixed at a predetermined position in the internal space F of the left front fender 110. ing.

It should be noted that a mounting structure other than the mounting plate portion 13 may be used, and for example, a mounting structure using fastening members such as various clips and screws can be applied.

The rear wall portion 11b is provided with a plurality of holes 11d communicating with the cavity portion 12. By providing the cavity portion 12 and the hole 11d in the fender soundproofing material 10, a Helmholtz type resonator (also referred to as a Helmholtz type resonator) can be configured. That is, when a sound wave outside the fender soundproofing material 10 is incident on the cavity 12 from the hole 11d, a resonance phenomenon occurs in the cavity 12, and the sound energy is converted into heat energy to obtain a sound absorbing effect. The resonance frequency can be obtained by a well-known calculation formula. In this embodiment, the diameter of the hole 11d, the length of the hole 11d, the dimension in the front-rear direction of the cavity 12, the aperture ratio, and the like are set so that the sound absorption effect in the frequency band of 400 Hz to 800 Hz is enhanced. The aperture ratio is the total opening area of the holes 11d in the surface area of the rear wall portion 11b, and in this embodiment, the aperture ratio is set to be in the range of 1.5% to 6.5%. Since the rear wall portion 11b extends from the inner surface of the fender panel 113 until it reaches the vehicle body panel 114 and reaches the tire house cover 112, it is possible to provide a large number of holes 11d, and the diameter and position of the holes 11d. The degree of freedom in setting is improved.

The hole 11d is formed in the rear wall portion 11b and is open to the surface of the rear wall portion 11b. Therefore, the hole 11d opens backward, that is, in the direction opposite to the traveling direction of the automobile 100. In this embodiment, the wall portion other than the rear wall portion 11b, that is, the front wall portion 11a and the peripheral wall portion 11c does not have a hole communicating with the cavity portion 12.

As described above, in the automobile 100, when traveling, the upward wind velocity generated behind the fender soundproofing material 10 in the internal space F of the left front fender 110 is the backward direction generated behind the fender soundproofing material 10. It is more than twice the wind speed, and it is considered that the wind noise generated behind the fender soundproofing material 10 in the internal space F is relatively loud. Further, since the space behind the fender soundproofing material 10 is close to the passenger compartment R, the wind noise can easily reach the passenger compartment R. In the present embodiment, since the hole 11d is formed in the rear wall portion 11b of the fender soundproofing material 10, the wind noise generated behind the fender soundproofing material 10 and the space behind the fender soundproofing material 10 The invading road noise, pattern noise, engine noise, and the like can be effectively absorbed by the fender soundproofing material 10. This will be described with reference to the graph of the noise measurement test result shown in FIG.

The horizontal axis of the graph shown in FIG. 6 is frequency (Hz), and the vertical axis is sound pressure level (dB).
The automobile 100 used in the noise measurement test is an ordinary passenger car. A speaker was installed adjacent to the front tire 105 of the stopped automobile 100, and a sound of 250 Hz to 8000 Hz was output upward from the speaker so as to have a sound pressure level of 100 dB to reproduce running noise in a simulated manner. The measurement position of the sound pressure level in the passenger compartment R is the ear position of the front seat occupant, and the microphone was installed at this position. The solid line in the graph shown in FIG. 6 is a case where the fender soundproofing material 10 according to the present invention is arranged in the internal space F of the left front fender 110. The broken line in the graph shown in FIG. 6 is a case where the hole of the fender soundproofing material is provided so as to open toward the front instead of the rear, and is referred to as Comparative Example 1. The alternate long and short dash line in the graph shown in FIG. 6 is a case where the fender soundproofing material is not provided with a hole, and is referred to as Comparative Example 2.

Looking at the band from 400 Hz to 800 Hz, the sound pressure level is reduced by about 4 dB at the maximum in the present invention as compared with the case where there is no hole in Comparative Example 2. Further, in the present invention, the sound pressure level is lowered by about 2 dB at the maximum as compared with the case where the hole of Comparative Example 1 is opened forward. Therefore, by forming the hole 11d that opens in the direction opposite to the traveling direction of the automobile 100 in the fender soundproofing material 10, the noise in the band of 400 Hz to 800 Hz can be greatly reduced.

(Posture of fender soundproofing material)
Next, the posture at the time of installing the fender soundproofing material 10 will be described. In this embodiment, as shown by the broken line in FIG. 7, the fender soundproofing material 10 is arranged so that the outer side in the vehicle width direction is located on the front side of the automobile 100 as compared with the inner side. As a result, the sound pressure in the high frequency band of the wind noise in the internal space F of the left front fender 110 can be effectively reduced. This will be described with reference to the graph of the noise measurement test result shown in FIG.

The horizontal axis and the vertical axis of the graph shown in FIG. 8 are the same as the graph shown in FIG. The automobile 100 used for the noise measurement test, the test equipment, and the test method are the same as the test shown in FIG. The solid line in the graph shown in FIG. 8 is the case where the fender soundproofing material 10 is arranged parallel to the vehicle width direction according to the first embodiment of the present invention, and is the posture shown by the solid line in FIG. The broken line in the graph shown in FIG. 8 relates to the second embodiment of the present invention, and is the case where the fender soundproofing material 10 is arranged so that the outside thereof is located on the front side of the automobile 100, and as shown by the broken line in FIG. The angle between the vehicle width direction and the rear wall portion 10b of the fender soundproofing material 10 is 30 °. The alternate long and short dash line in the graph shown in FIG. 8 is a case where the fender soundproofing material 10 is arranged so that the outside thereof is located behind the automobile 100 according to the third embodiment of the present invention, and the alternate long and short dash line is also shown in FIG. As shown, the angle between the vehicle width direction and the front wall portion 10a of the fender soundproofing material 10 is 30 °.

Looking at the band from 1100 Hz to 8000 Hz, it can be seen that the sound pressure level of Example 2 arranged so that the outside of the fender soundproofing material 10 is located on the front side of the automobile 100 is low as a whole. Although not shown, in the case of Examples 2 and 3, the same result can be obtained if the angle formed with the vehicle width direction is in the range of 30 ° to 45 °.

Further, although not shown, dimples may be provided on the surface of the outer wall portion 11. As a result, the wind noise can be further reduced.

(Structure of deformation-inducing part)
The outer wall portion 11 is provided with a deformation-inducing portion 11e that induces deformation of the outer wall portion 11 by an impact applied from the outside to the fender soundproofing material 10. As described above, since the left front fender 110 has a shock absorbing structure, the fender panel 113 is mainly deformed toward the internal space F side when an obstacle collides with the left front fender 110, and this deformation causes the fender soundproofing. An impact of a predetermined value or more may be applied to the material 10 from the outside. When such an impact of a predetermined value or more is applied to the fender soundproofing material 10 from the outside, the deformation-inducing portion 11e can induce the deformation of the outer wall portion 11 to facilitate the deformation of the outer wall portion 11.

The deformation-inducing portion 11e can be a concave portion formed on the outer wall portion 11. In this embodiment, as shown in FIG. 3, the deformation-inducing portion 11e is provided on both the front wall portion 11a and the rear wall portion 11b, but it may be provided on only one of them. By making the deformation-inducing portion 11e a concave portion, when an impact of a predetermined value or more is applied to the fender soundproofing material 10 from the outside, the deformation-inducing portion 11e is more easily deformed than other portions, and this deformation-inducing portion 11e And its vicinity begin to deform, which allows the outer wall portion 11 to be significantly deformed.

The deformation-inducing portion 11e may be a concave portion extending in the vertical direction, a concave portion extending in the left-right direction, or a concave portion extending in the diagonal direction. Further, a plurality of concave portions may be provided on the front wall portion 11a and the rear wall portion 11b, respectively. The deformation-inducing portion 11e can be formed of, for example, a groove, a thin-walled portion, a notch portion, or the like, and these may be combined.

(Action and effect of the embodiment)
As described above, according to this embodiment, each hole 10d of the fender soundproofing material 10 is opened in the direction opposite to the traveling direction of the automobile 100. Therefore, as shown in the graph of FIG. 6, the automobile 100 The sound absorption effect can be enhanced as compared with the case where the opening is in the traveling direction (Comparative Example 1).

Further, for example, when an obstacle collides with the fender 110 and an impact of a predetermined value or more is applied to the fender soundproofing material 10 from the outside, the deformation-inducing portion 11e induces the deformation of the outer wall portion 11, and the deformation of the outer wall portion 11 causes an impact. Is absorbed. At this time, since the outer wall portion 11 is a portion surrounding the cavity portion 12, the deformation of the outer wall portion 11 is not hindered, and the desired shock absorption can be obtained.

The above embodiments are merely exemplary in all respects and should not be construed in a limited way. Further, all modifications and modifications belonging to the equivalent scope of the claims are within the scope of the present invention.

As described above, the present invention can be applied to, for example, a front fender of an automobile.

1 Fender soundproof structure 10 Fender soundproof material 11 Outer wall part 11a Front wall part 11b Rear wall part 11d Hole 11e Deformation induction part 12 Cavity part 100 Automobile 110 Left front fender 112 Tire house cover 113 Fender panel 114 Body panel

Claims (2)

In the fender soundproofing material disposed inside the fender of an automobile
The fender soundproofing material has an outer wall portion and a cavity portion surrounded by the outer wall portion, and is disposed in the middle portion of the fender in the traveling direction of the automobile.
In the outer wall portion, a plurality of holes that open in the direction opposite to the traveling direction of the automobile and communicate with the cavity portion, and the impact applied from the outside to the fender soundproofing material induces deformation of the outer wall portion. A deformation-inducing part is provided .
The outer wall portion has a front wall portion extending in the vertical direction and a front wall portion extending in the vertical direction away from the front wall portion in the direction opposite to the traveling direction of the automobile as compared with a region in the fender facing the front wall portion. It has a rear wall part that is arranged so as to face an area where the upward wind speed is high,
A fender soundproofing material characterized in that a plurality of the holes are provided in the rear wall portion . In the fender soundproof structure of automobiles
A fender soundproofing material having an outer wall portion and a cavity portion surrounded by the outer wall portion is disposed in the middle portion of the fender in the traveling direction of the automobile.
In the outer wall portion, a plurality of holes that open in the direction opposite to the traveling direction of the automobile and communicate with the cavity portion, and the impact applied from the outside to the fender soundproofing material induces deformation of the outer wall portion. A deformation-inducing part is provided.
The fender soundproofing material is formed in a plate shape extending in the vertical direction, and is characterized in that the outside in the vehicle width direction is arranged so as to be located on the front side of the automobile as compared with the inside .

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