JP4406871B2 - Sound absorption structure of automobile - Google Patents

Description

  The present invention relates to a sound-absorbing structure for a vehicle that reduces road noise that is annoying for passengers of the traveling vehicle.

  Road noise is known as one of various noises generated in a running car that is particularly disturbing for the passengers of the car. As such road noise, for example, vibration generated when a running tire of a vehicle collides with a road surface resonates with a suspension and is transmitted to the vehicle body as a large vibration. The noise around 160 Hz generated by the vibration of the air in the room, and the noise around 250 Hz generated by vibrating the indoor air by directly resonating the floor due to the vibration caused by the collision of the tire of the traveling automobile with the road surface is there.

  Here, with respect to road noise near 160 Hz, it is known that floor vibration can be effectively reduced and noise can be suppressed by adjusting the suspension of an automobile and using an insulator or the like. For road noise near 250 Hz based on floor resonance, a large amount of vibration damping material such as mel sheet is stuck on the floor, or the floor pressure and rigidity of the floor are increased to prevent resonance at 250 Hz.

With a general method, the effect of the sound absorbing material cannot be expected with low-frequency air vibrations of 500 Hz or less. However, if the material is devised, or if a damping material is provided at a position where the air particle velocity is high, it will be low. It is known that a certain effect can be expected even at a frequency (for example, see Patent Document 1).
JP 2001-306080 A

  However, in the method of affixing a large amount of vibration damping material such as Mel sheet to the floor or increasing the plate pressure of the floor, the material cost and labor cost etc. increase with the increase in material and process, There has been a problem that the weight of the vehicle also increases.

Sound absorbing material for pan are those that can be expected to exert effects in the original 500Hz above the high frequency region, for road noise of the low frequency region near 250Hz to those of special material, as described in Patent Document 1 It seems that the effect can be expected, but in reality there is no such thing and it is not easily available.

  In addition, it is known that a certain effect can be expected by providing a sound absorbing material in a place where the particle velocity is high, but the position in the vehicle interior where the particle velocity is high so that the sound absorbing material such as felt is effective even at low frequencies. Setting it to is not easy.

  Specifically, in order to expect an effect at low frequencies, it is necessary to make it soft so that the amount of air passing through it is large, so it is necessary to devise in terms of dirt, durability, appearance, etc. there were.

The present invention has been made in view of such circumstances, the annoying road noise passenger automobile is transmitted from the inside between the load Shitsusora felt during running of the motor vehicle passenger space, the weight gain An object of the present invention is to provide a sound absorbing structure for an automobile that can be reduced while reducing the appearance of the vehicle interior and providing the sound absorbing material with high durability .

In order to solve the above-described problems, the present invention provides a sound absorbing structure for an automobile that absorbs road noise transmitted to the luggage compartment space of the automobile using a sound absorbing material, and partitions the luggage compartment space and the passenger space. is formed on the partition member, includes one or more openings capable of outputting the road noise from the inside of the cargo room space to the passenger space, the sound absorbing material, the partition member a said passenger space Is provided on the back side of the headrest of the seat adjacent to the headrest, and the opening is configured to direct the road noise to the backside of the headrest .

According to the present invention, an unpleasant road noise (for example, a road noise near 250 Hz) that a passenger of a vehicle feels during driving of the vehicle, which is transmitted intentionally from the luggage compartment space to the passenger space. By outputting to the outside only from one or a plurality of noise output ports provided in a part of the closed space (for example, a partition part such as a package tray constituting a part of the closed space). Since the air particle velocity is high in the vicinity of the opening, the output road noise can be suitably reduced using the sound absorbing material. In addition, there is no need to put a large amount of damping material, such as Merushito to the floor portion and the trunk room as Until now. As a result, it is possible to expect an increase in weight due to the damping material and a shortening of the process due to the pasting process, and a sound insulation method excellent in cost can be obtained.
Further, since the sound absorbing material is arranged in the headrest of the seat that is not directly visible to the passengers of the automobile, the appearance in the vehicle is not deteriorated. Furthermore, since the sound absorbing material is not exposed, even if the sound absorbing material is used for a long period of time, it is possible to suppress the adhesion of dust, dust and the like to the sound absorbing material, and the sound absorbing material and the like can have high durability. Moreover, it is also possible to prevent the sound absorption effect from being lowered by applying a sound absorbing material to the back side of the headrest.

  Hereinafter, with reference to drawings, the roof structure of the motor vehicle concerning one embodiment of the present invention and the motor vehicle provided with the roof structure are explained in detail.

  FIG. 1 is a diagram illustrating a sound absorbing structure of an automobile that absorbs road noise transmitted to a closed space in the automobile according to an embodiment of the present invention. In FIG. 1, 11 is a luggage space such as a trunk room which is one of the closed spaces in the automobile. Reference numeral 12 denotes a partition member such as a package tray that partitions the cargo space 11 and the passenger space of the automobile. Further, 13 is a seat adjacent to the partition member 12 (a rear seat in FIG. 1), and 14 is a headrest of the seat 13. Furthermore, 16 is an opening provided on the partition member 12 capable of outputting road noise from the inside of the luggage compartment space 11 to the outside. Note that the number of openings 16 is not limited to one and may be plural. The road noise output from the cargo space 11 through the opening 16 into the passenger space is absorbed using a sound absorbing material.

In the present embodiment, when road noise is output from the opening 16 in the cargo space, the air particle velocity due to the road noise is increased in the process of being transmitted from the large space to the small exit. Is used. As described above, the general-purpose sound-absorbing material can be expected to be effective in a high-frequency region of 500 Hz or higher, and does not exhibit much effect against road noise near 250 Hz. However, even a generally used sound absorbing material can absorb sound effectively when air particles caused by noise having a low frequency of 500 Hz or less are absorbed at a high vibration speed (particle speed). This property is used in this embodiment.

  FIG. 2 is a diagram for explaining details of the sound absorbing structure according to the present embodiment. In this embodiment, road noise from the cargo space is reduced by using various sound absorbing structures as shown in FIGS. FIG. 2A is a view showing a sound absorbing structure in which a sound absorbing material 15 is embedded in an upper back surface of a seat 13 such as a rear seat of an automobile adjacent to the partition member 12. At this time, the position where the sound absorbing material 15 is embedded is preferably a portion where road noise output from the opening 16 directly collides with the upper portion of the seat 13.

  FIG. 2B is a view showing a sound absorbing structure in which a sound absorbing material 15 is embedded in a rear portion of a headrest of a seat 13 such as a rear seat of an automobile adjacent to the partition member 12. At this time, the position where the sound absorbing material 15 is embedded is most preferably a portion where the road noise output from the opening 16 directly collides with the headrest 14 of the seat 13. Furthermore, FIG.2 (c) shows the state of the sound-absorbing structure in which the sound-absorbing material 15 is embedded in both the upper rear surface of the seat 13 and the rear part of the headrest when the examples of FIGS. 2 (a) and 2 (b) are performed simultaneously. FIG.

  Furthermore, in addition to the embodiments of FIGS. 2 (a) to 2 (c), by further arranging a sound absorbing material around the opening 14, road noise output to the outside can be embedded in a seat or the like. The sound absorbing material may be combined with the sound absorbing material.

  Here, in the sound absorbing structure shown in FIG. 2, the sound absorbing material 14 is embedded in the back of the seat at a position that is not directly visible to the passengers of the automobile, so that the appearance inside the vehicle is not deteriorated and is long. Even if dirt or dust adheres to the sound-absorbing material due to the use of the period, it is not directly visible to the passenger, so that the aesthetics of the room can be maintained. Accordingly, each of the sound absorbing materials 15 shown in FIGS. 2A to 2C is merely exposed without being embedded in the upper back surface of the seat 13 or the rear portion of the headrest (for example, adhered to the back surface of the seat). It is considered that the same effect can be sufficiently obtained.

  However, instead of exposing the sound absorbing material 15, it was embedded in a seat or a headrest as described above, and the portion facing the road noise was covered with a breathable cloth or the like so that it was used for a long time. Even in this case, it is possible to suppress the adhesion of dust, dust, etc. to the sound-absorbing material, so that the decrease in the sound-absorbing effect of road noise caused by the coated cloth is minimized, and in addition to the above-mentioned sound-absorbing effect, High durability can be imparted to the sound absorbing material or the like.

  Thus, in the sound absorbing structure for an automobile according to the present embodiment, the sound absorbing material is disposed on the back of the seat, which is a position that cannot be directly seen by the passenger of the automobile, as shown in FIG. The appearance of the interior of the vehicle will not deteriorate, and even if dirt or dust adheres to the sound-absorbing material due to long-term use, it will not be directly visible to the passenger, so the aesthetics of the room will be maintained. be able to. It is applied to the back surface of the seat adjacent to the partition member that partitions the cargo space and the passenger space of the automobile, and the opening of the cargo space is on the partition member corresponding to the position of the sound absorbing material applied to the back surface of the seat. It is provided in the position. As a result, the sound absorbing material is placed on the back of the seat, which is not directly visible to the passengers of the car, so the appearance inside the vehicle will not deteriorate, and dust, dust, etc. will adhere to the sound absorbing material after long-term use. Even if it is dirty, it is not directly visible to the passengers, so the aesthetics of the room can be maintained.

  Further, in the sound absorbing structure for an automobile according to the present embodiment, the sound absorbing material is applied to the back side in the headrest of the seat as shown in FIG. 2 (b), and the opening noise is generated in the headrest of the seat. It is configured to be directed to the applied sound absorbing material. As described above, since the sound absorbing material is not exposed by providing the sound absorbing material in the headrest, it is possible to suppress the attachment of dust or dust to the sound absorbing material even when used for a long period of time. It can be durable. Moreover, it is also possible to prevent the sound absorption effect from being lowered by applying a sound absorbing material to the back side of the headrest.

  Drawing 3 is a figure for explaining an example of an opening provided in a partition part in a sound-absorbing structure concerning this embodiment. As described above, the position where the sound absorbing material is embedded is most preferably a portion where the road noise output from the opening 16 collides with the seat 13. Here, since the sound absorbing material 15 is embedded in the upper rear surface of the seat 13 or the rear part of the headrest 14 as described above, the position of the opening 16 corresponds to the position of the seat 13 and the headrest 14 as shown in FIG. Thus, it is provided on the seat side of the partition material. As shown in FIGS. 3A and 3B, the shape of the opening 16 is rectangular or circular as long as the particle velocity of the road noise from the cargo space 11 can be increased. Any other shape such as an ellipse may be used.

Next, FIG. 4 is a diagram illustrating a sound absorbing structure of a vehicle that absorbs road noise transmitted to a closed space in the vehicle according to the reference example . In another embodiment, as an example of providing a sound absorbing structure that absorbs road noise in a fender inner space formed by covering a passenger space side of a vehicle fender with a seal plate as a closed space. explain.

  In FIG. 4, reference numeral 41 denotes a fender seal plate, and reference numeral 42 denotes a fender portion inner space configured by covering the passenger space side of the fender portion with the seal plate 41. As shown in FIG. 4, the fender portion inner space 42 is provided with a sound absorbing material 43 and has one or a plurality of openings 44 capable of outputting road noise on the bottom surface. As described above, the annoying road noise transmitted from the tire to the fender portion is output to the outside from the opening which is one or a plurality of noise output ports provided on the bottom surface. The particle velocity becomes high, and the output road noise can be suitably reduced by using the sound absorbing material applied to the opening.

As described above, according to the embodiment and the reference example of the present invention , it is an annoying road noise (for example, a road noise around 250 Hz) that a passenger of a vehicle feels while driving the vehicle, for example, a trunk room (loading room) ) And road noise transmitted to the passenger space from inside the closed space in the vehicle such as the inner space of the fender, etc., partly in the closed space (for example, a partition such as a package tray constituting a part of the closed space) In the vicinity of the opening, the particle velocity of the air becomes high, so that the output road noise is absorbed by the sound absorbing material. It can reduce suitably. In addition, since road noise can be suitably reduced in a closed space such as a luggage compartment, it is not necessary to apply a large amount of vibration damping material such as a melt sheet in a floor portion or a trunk room as in the past. As a result, it is possible to expect an increase in weight due to the damping material and a shortening of the process due to the pasting process, and a sound insulation method excellent in cost can be obtained.

It is a figure which shows the sound absorption structure of the motor vehicle which absorbs the road noise transmitted to the closed space in the motor vehicle based on one Embodiment of this invention. It is a figure for demonstrating the detail of the sound absorption structure which concerns on this embodiment. It is a figure for demonstrating an example of the opening part provided in the partition part in the sound absorption structure which concerns on this embodiment. It is a figure which shows the sound absorption structure of the motor vehicle which absorbs the road noise transmitted to the closed space in the motor vehicle based on a reference example .

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Cargo space 12 Partition part 13 Seat 14 Headrest 15, 43 Sound-absorbing material 16, 44 Opening 41 Fender seal plate 42 Fender part inner space

Claims (1)

A sound-absorbing structure for a vehicle that absorbs road noise transmitted to the luggage space of the vehicle using a sound-absorbing material,
The luggage compartment is formed on the partition member partitions the space between the passenger space, with one or more openings capable of outputting the road noise from the inside of the cargo room space to the passenger space,
The sound absorbing material is applied to the back side in the headrest of the seat adjacent to the partition member in the passenger space,
The sound absorbing structure for an automobile, wherein the opening is configured to direct the road noise to a back surface of the headrest .

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