JP2021146876A - Sound insulation panel for automobile - Google Patents

Abstract

To provide a sound insulation panel for an automobile, that is suitable for reducing the weight of the sound insulation panel, expanding the frequency band which can insulate sound, and improving the sound insulation performance, as well as, that has excellent deformability (three-dimensional degree of freedom) capable of flexibly coping with the three-dimensional unevenness of the surface when the sound insulation panel is installed on the surface that requires sound insulation of an automobile.SOLUTION: A sound insulation panel S1 for an automobile comprises: a sound absorbing panel material P1 forming a sound absorbing layer 1; a surface panel material P2 forming a surface layer 2 on the sound absorbing layer; and a plurality of elastic bodies E forming an elastic layer 3 between the sound absorbing layer and the surface layer. The sound absorbing panel material comprises: a plurality of accommodating space portions 4 deformably provided along the unevenness of a surface requiring sound insulation of the automobile, and opened toward the surface panel material. A portion in a range facing an opening of the accommodating space in the surface panel material functions as a first vibrating film 5. Each elastic body E has a recess 6 arranged in the accommodating space, and a bottom of the recess functions as a second vibrating film 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to an automobile sound insulation panel installed in a portion requiring sound insulation such as an automobile floor, and is particularly suitable for reducing the weight of the sound insulation panel, expanding the frequency band capable of sound insulation, and improving the sound insulation performance. Moreover, it is excellent in deformability (three-dimensional degree of freedom) that can flexibly cope with the three-dimensional unevenness of the surface when it is installed on a surface of an automobile that requires sound insulation.

Sound insulation panels are installed in parts of automobiles that require sound insulation, for example, floors. A specific structure of this type of sound insulation panel is disclosed in, for example, Patent Document 1.

The sound insulation panel disclosed in Patent Document 1 (hereinafter referred to as "conventional sound insulation panel") includes a hollow plate-shaped resin structure (10), and the resin structure (10) has a cell (S) inside the resin structure (10). Helmholtz resonance is obtained by the structure in which a plurality of the cells (S) are arranged side by side and the communication holes (15) are individually communicated with each cell (S), and the communication holes (15) and the corresponding cells (S) are used. It has a structure.

Further, in the conventional sound insulation panel, the sheet body (50) is laminated on the resin structure (10), and the weight of the entire sound insulation panel is increased by the lamination to improve the sound insulation performance.

However, as described above, the conventional sound insulation panel utilizes the weight increase of the entire sound insulation panel due to the lamination of the sheet body (50) as a means for improving the sound insulation performance, so that the weight of the entire sound insulation panel should be reduced. It is difficult.

Further, in the conventional sound insulation panel, since the opening of the communication hole (15) is closed by laminating the sheet body (50), the resonance degree of Helmholtz resonance is reduced, and the sound insulation effect by Helmholtz resonance is obtained. It cannot be effectively exerted, and a sound insulation panel with high sound insulation performance cannot be obtained.

Further, in the conventional sound insulation panel, a sound insulation effect can be expected by the film vibration of the sheet body (50) near the opening of the communication hole (15), but it is difficult to control the vibration frequency of the film vibration, and the range is wide. A sound insulation panel that enables sound insulation in the frequency band cannot be obtained.

The reference numerals in parentheses are the reference numerals used in Patent Document 1.

Japanese Unexamined Patent Publication No. 2017-151325

The present invention has been made to solve the above problems, and an object of the present invention is suitable for reducing the weight of a sound insulation panel, expanding a frequency band capable of sound insulation, and improving sound insulation performance, and an automobile. It is an object of the present invention to provide an automobile sound insulation panel having excellent deformability (three-dimensional degree of freedom) capable of flexibly responding to three-dimensional unevenness of the surface when installed on a surface requiring sound insulation.

In order to achieve the above object, the present invention comprises a sound absorbing panel material that forms a sound absorbing layer, a surface panel material that forms a surface layer on the sound absorbing layer, and an elastic layer between the sound absorbing layer and the surface layer. The sound absorbing panel material is provided so as to be deformably provided along the unevenness of the surface requiring sound insulation of the automobile, and a plurality of accommodating space portions opened toward the surface panel material. The surface panel material has a range facing the opening of the accommodation space as a first vibrating film, and each elastic body has a recess arranged in the accommodation space. The bottom of the recess functions as a second vibrating membrane.

In the present invention, in order to make the bottom of the recess effectively function as the second vibration film, a ring-shaped edge is formed at the bottom of the recess, and the inner region of the edge is the second vibration. It may be characterized in that it is configured to function as a film.

In the present invention, the sound absorbing panel material is provided with a first hole, and the accommodating space portion is divided into two chambers by the first vibrating membrane of the elastic body and its peripheral portion. The first hole communicates with the first chamber located on the sound absorbing panel material side, so that the first Helmholtz resonator is formed by the first chamber and the first hole. It may be characterized by having.

In the present invention, the surface panel material is provided with a second hole, and the accommodating space portion is divided into two chambers by the first vibrating membrane of the elastic body and its peripheral portion. The second hole communicates with the second chamber located on the surface panel material side, whereby a second Helmholtz resonator is formed by the second chamber and the second hole. It may be characterized by having.

The present invention may be characterized in that an intermediate sound absorbing panel material forming an intermediate sound absorbing layer is provided between the surface layer and the elastic layer.

In the present invention, the intermediate sound absorbing panel material is provided with a third hole, and the accommodating space portion is divided into two chambers by the first vibrating membrane of the elastic body and its peripheral portion. By communicating the third hole with the chamber located on the intermediate sound absorbing panel material side of the chamber, a third Helmholtz resonator is formed by the chamber and the third hole. It may be a feature.

In the present invention, the intermediate sound absorbing panel material may be characterized in that a range facing the upper surface opening of the accommodation space portion is opened.

In the present invention, the bottom of the accommodation space may be open.

The present invention may be characterized in that the plurality of elastic bodies have an integrated structure by connecting their respective edges to each other by a connecting portion.

In the present invention, the plurality of elastic bodies may be characterized in that they have a single structure in which each of them exists independently and independently.

In the present invention, the sound absorbing layer is a skin layer having properties different from those of other parts at least in the vicinity of the surface adjacent to the surface layer in the entire layer, and the skin layer allows the surface layer to be described. It may be characterized in that the air permeability of the entire range up to the sound absorbing layer is adjusted.

In the present invention, the skin layer may be formed near a contact surface with the mold when the sound absorbing panel material is molded with the mold.

In the present invention, the skin layer may be formed by retrofitting a separate member to the sound absorbing panel material.

According to the present invention, as a specific structure of the sound insulation panel for an automobile, as described above, a configuration including a first vibrating film and a second vibrating film is adopted in addition to the sound absorbing layer. Therefore, for example, even if the weight of the sound absorbing layer and / or the surface layer is not increased, the sound absorbing effect exceeding the weight law can be obtained by the vibration of the first vibrating film and the second vibrating film, and the first and the first Since the second vibrating membrane can cope with sound absorption in the low frequency band and, in addition, the sound absorption effect in the sound absorption layer can be obtained, the weight of the sound insulation panel for automobiles can be reduced and the frequency at which sound insulation can be performed. It has the effect of being able to provide an automobile sound insulation panel suitable for expanding the band and improving the sound insulation performance.

Further, in the present invention, as a specific structure of the sound insulation panel for an automobile, as described above, the sound absorbing panel material is provided so as to be deformable along the unevenness of the surface requiring sound insulation of the automobile. It is possible to provide an automobile sound insulation panel having excellent deformability (three-dimensional degree of freedom) that can flexibly cope with the three-dimensional unevenness of the surface when the sound insulation panel is installed on the surface.

In particular, in the present invention, in the structure provided with the Helmholtz resonator, sound insulation in a wider frequency band is possible by combining the resonance frequency with the nth resonance in the first vibrating membrane and the second vibrating membrane. The effect of becoming is obtained.

(A) is a plan view of a sound insulation panel for an automobile to which the present invention is applied, and (b) is an enlarged cross-sectional view taken along the line A in (a). An enlarged cross-sectional view of the vicinity of arrow B in FIG. 1 (b). FIG. 1A is a plan view of a surface panel material constituting the automobile sound insulation panel of FIG. 1A. FIG. 3 is a plan view of a plurality of elastic bodies constituting the automobile sound insulation panel of FIG. 1 (a). FIG. 3 is a plan view of a sound absorbing panel material constituting the sound insulating panel for an automobile shown in FIG. 1 (a). Explanatory drawing of other structural examples of a plurality of elastic bodies. Explanatory drawing of other structural examples of a plurality of elastic bodies. (A)-(k) are explanatory views of the cross-sectional shape variation of the concave portion provided in the elastic body. Explanatory drawing of another embodiment of this invention. Explanatory drawing of another embodiment of this invention. Explanatory drawing of another embodiment of this invention.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the attached drawings.

Is.

<< Basic configuration of sound insulation panel for automobiles >>
Referring to FIGS. 1A and 1B, the automobile sound insulation panel S1 of the present embodiment forms a sound absorbing panel material P1 forming the sound absorbing layer 1 and a surface layer 2 on the sound absorbing layer 1. The surface panel material P2 includes a plurality of elastic bodies E, E ... That form an elastic layer 3 between the sound absorbing layer 1 and the surface layer 2.

The sound absorbing panel material P1 is provided so as to be deformably provided along the unevenness of the surface of the automobile requiring sound insulation (hereinafter referred to as "sound insulation surface"), and a plurality of accommodation space portions 4 having an upper surface opened toward the surface panel material P2 are provided. Have.

The deformable sound absorbing panel material P1 as described above is obtained by forming the sound absorbing panel material P1 with, for example, a urethane material, a fiber material, or a foam material, but is not limited to these materials.

Examples of the sound insulation surface as described above include the interior floor surface of an automobile, the floor surface in a luggage room, the inner surface of a door trim known as an interior component for an automobile (the surface opposite to the design surface facing the interior of the vehicle), or The inner surface of the vehicle body panel may be considered, but the present invention is not limited to these.

The surface panel material P2 is configured such that the range RG (see FIG. 2) facing the opening of the accommodation space 4 functions as the first vibrating film 5. The first vibrating film 5 is a film that can freely vibrate by sound energy such as noise and vibration energy.

Each of the elastic bodies E, E ... Has a recess 6 arranged in the accommodating space 4, and the bottom of the recess 6 is configured to function as a second vibrating film 7 (see FIG. 2). .. Like the first vibrating film 5, the second vibrating film 7 is also a film that can be freely vibrated by sound energy such as noise and vibration energy.

<< Details of sound absorbing panel material P1 >>
As a specific embodiment of the sound absorbing panel material P1, in the automobile sound insulating panel S1 of the present embodiment, the sound absorbing panel material P1 adopts a configuration including a first hole H1 (see FIGS. 2 and 5). Further, referring to FIG. 2, the accommodating space 4 of the sound absorbing panel material P1 is divided into two chambers 41 and 42 by the first vibrating film 5 of the elastic body E and its peripheral portion, and is divided into two chambers 41 and 42 according to the present embodiment. In the sound insulation panel S1 for automobiles, the first hole H1 communicates with the first room 41 located on the sound absorbing panel material P1 side of the two rooms 41 and 42, so that the first room 41 The first Helmholtz resonator AG1 is composed of the first hole H1 and the first hole H1.

The resonance frequency of the first Helmholtz resonator AG1 configured as described above is uniquely determined by the dimensions of the first hole H1, the arrangement interval (pitch), and the volume of the first chamber 41. Therefore, in the sound insulation panel S1 for automobiles of the present embodiment, for example, the volume of the first chamber 41 is changed, the size of the first hole H1 is changed, or the number or arrangement of the first holes H1 is changed. The resonance frequency of the first Helmholtz resonator AG1 can be adjusted (tuned) by changing the interval or the like.

The cross-sectional shape of the first hole H1 is not limited to a circular shape, and various cross-sectional shapes such as an elongated hole shape, a semicircular shape, a crescent shape, and a star shape can be adopted. Further, the first hole H1 may be configured as a hole having the same inner diameter in the range from one end to the other end, or may be configured as a multi-stage hole having a different inner diameter or a tapered hole.

<< Details of surface panel material P2 >>
As a specific example of the configuration of the surface panel material P2, in the sound insulation panel S1 for automobiles of the present embodiment, the surface panel material P2 is composed of a resin plate having a predetermined thickness. The surface panel material P2 also exhibits a sound insulation effect because a part of the surface panel material P2 functions as the first vibrating film 5 as described above. Therefore, the material of the resin plate constituting the surface panel material P2 and its thickness are appropriately changed as necessary in consideration of the frequency band to be sound-insulated.

Further, as a specific example of the structure of the surface panel material P2, in the sound insulation panel S1 for automobiles of the present embodiment, the surface panel material P2 adopts a configuration including a second hole H2.

As described above, the accommodation space 4 of the sound absorbing panel material P1 is divided into two chambers 41 and 42, and in the automobile sound insulating panel S1 of the present embodiment, the surface panel material P2 side of the two chambers 41 and 42 The second hole H2 communicates with the second chamber 42 located in, thereby forming a second Helmholtz resonator AG2 by the second chamber R2 and the second hole H2.

The resonance frequency of the second Helmholtz resonator AG2 configured as described above is uniquely determined by the dimensions of the second hole H2, the arrangement interval (pitch), and the volume of the second chamber 42. Therefore, the resonance frequency of the first Helmholtz resonator AG2 also changes the volume of the second chamber 42, or changes the dimensions of the second hole H2, or the number of the second holes H2 or It can be adjusted (tuned) by changing the placement interval.

The cross-sectional shape of the second hole H2 is also not limited to a circular shape, and various cross-sectional shapes such as an elongated hole shape, a semicircular shape, a crescent shape, and a star shape can be adopted. Further, the second hole H2 may also be configured as a hole having the same inner diameter in the range from one end to the other end, or may be configured as a multi-stage hole having a different inner diameter or a tapered hole.

<< Details of elastic body E >>
The elastic body E is formed of an elastic material such as a rubber material or an elastomer resin material. In this case, the entire elastic body E may be formed of an elastic material, or only the portion of the second vibrating film 7 of the entire elastic body E, that is, the bottom of the recess 6 and its peripheral portion may be partially made of an elastic material. It may be formed, and the other portion may be formed of a material other than the elastic material.

In order to make the bottom of the recess 6 effectively function as the second vibrating film 7, in the automobile sound insulation panel S1 of the present embodiment, as shown in FIG. 2, a ring-shaped recess or protrusion is formed on the bottom of the recess 6. A ring portion 6A made of a protrusion or a protrusion is formed, and a structure is adopted in which the inside of the ring portion 6A functions as a second vibrating film 7.

The inner diameter of the link portion 6A can be appropriately changed as needed. The resonance frequency of the vibrating film may be adjusted by changing the inner diameter of the ring portion 6A.

Further, although not shown, this type of ring portion 6A can be provided in a plurality of layers. For example, when a double inner and outer ring portion is adopted, the range surrounded by the inner ring portion is regarded as one vibrating membrane. In addition to the function, in addition to this, a donut-shaped portion located between the inner and outer ring portions also functions as another vibrating membrane, and a plurality of vibrating membranes having different resonance frequencies can be provided in one recess 6.

The shape of the recess 6 provided with the first vibrating film 7 can be appropriately changed as necessary, such as setting according to the frequency band for which sound insulation is desired. For example, the recess 6 having the shape shown in FIGS. 8A to 8K may be adopted.

Referring to FIG. 4, in the automobile sound insulation panel S1 of the present embodiment, the edges (specifically, the outer peripheral edge of the vibrating film 7) of the plurality of elastic bodies E, E ... are connected in a line shape. By being connected to each other by the part CN, it has an integrated structure.

When an integrated structure is adopted for the plurality of elastic bodies E, E ..., the required number of the plurality of elastic bodies 3 can be handled together without omission in the manufacturing process of the sound insulation panel S1 for automobiles, and also. It is possible to improve the handleability and manageability of the parts constituting the automobile sound insulation panel S1, such as being suitable for collectively managing the required number of the plurality of elastic bodies 3.

6 and 7 are explanatory views of other structural examples of the plurality of elastic bodies.

The plurality of elastic bodies E, E ... may have a single structure in which each of the elastic bodies E, E ... Exists independently as shown in FIG. Further, by expanding the line-shaped connecting portion 4C of FIG. 4 described above in a plane as shown in FIG. 6 to form a sheet, a plurality of elastic bodies E, E ... Are provided on one sheet body. May be done.

With reference to FIGS. 4, 6 and 7, in the sound insulation panel S1 for automobiles of the present embodiment, elastic bodies E, E having the same size and shape as specific configuration examples of the plurality of elastic bodies E, E ... ... Has adopted a structure in which ... are continuously provided at a predetermined pitch, but the present invention is not limited to this. The size, shape, and pitch of the elastic body E may be different, and can be appropriately changed as needed.

<< Other Embodiments of the Present Invention >>
9 to 11 are explanatory views of other embodiments of the present invention. In the automobile sound insulation panels S2, S3, and S4 shown in these figures, the same members as the constituent members of the automobile sound insulation panel S1 shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the sound insulation panel S2 for automobiles of FIG. 9, an intermediate sound absorbing panel material P3 forming an intermediate sound absorbing layer 9 is provided between the surface layer 2 and the elastic layer 3. Further, the intermediate sound absorbing panel material P3 includes a third hole H3. In the sound insulation panel S2 for automobiles, the accommodation space 4 is divided into two chambers 41 and 42 by the first vibrating film 5 of the elastic body E and its peripheral portion, and the intermediate sound absorbing panel of the two chambers 41 and 42. By communicating the third hole H3 with the chamber 42 located on the material P3 side, a third Helmholtz resonator AG3 is formed by the chamber 42 and the third hole H3.

In the sound insulation panel S3 for automobiles of FIG. 10, the sound absorbing layer 1 is a skin layer 1A having properties different from those of the other parts at least in the vicinity of the surface adjacent to the surface layer 2 in the entire layer. The air permeability of the entire range from the surface layer 2 to the sound absorbing layer 1 is adjusted by 1A.

The skin layer 1A as described above may be formed in the vicinity of the contact surface with the mold when the sound absorbing panel material P1 is molded by the mold, or a separate member may be provided with respect to the sound absorbing panel material P1. It may be formed by retrofitting.

The skin layer 1A is configured such that the range BT (see FIG. 10), which is the bottom of the accommodation space portion 4, functions as the third vibrating film 8. The third vibrating film 8 may be a film that can freely vibrate by sound energy such as noise and vibration energy.

In the sound insulation panel S4 for automobiles of the embodiment shown in FIG. 11, the intermediate sound absorbing panel material P2 is configured so that the range facing the upper surface opening 4A of the accommodation space 4 is opened. In addition, the bottom of the accommodation space 4 is also configured to open.

<< Summary of the above >>
The automobile sound insulation panels S1 to S4 of the above-described embodiment all have a configuration in which a first vibrating film 5 and a second vibrating film 7 are provided in addition to the sound absorbing layer 1 as a specific structure thereof. It was adopted. Therefore, for example, even if the weight of the sound absorbing layer 1 and / or the surface layer 2 is not increased, the sound absorbing effect exceeding the weight rule can be obtained by the vibration of the first vibrating film 5 and the second vibrating film 7. , The first and second vibrating membranes 5 and 7 can cope with sound absorption in the low frequency band, and in addition, the sound absorption effect in the sound absorption layer 1 can be obtained. Therefore, the sound insulation panel for automobiles is lightweight. It is suitable for improving the sound insulation performance, expanding the frequency band capable of sound insulation, and improving the sound insulation performance.

Further, according to the automobile sound insulation panels S1 to S4, as a specific structure thereof, as described above, the sound absorbing panel material P1 is provided so as to be deformably provided along the unevenness of the surface requiring sound insulation of the automobile. When this type of sound insulation panel for automobiles is installed on the surface, it is excellent in deformability (three-dimensional degree of freedom) that can flexibly cope with the three-dimensional unevenness of the surface.

The present invention is not limited to the embodiments described above, and more modifications can be made by a person having ordinary knowledge in the art within the technical idea of the present invention.

1 Sound absorbing layer 1A Skin layer 2 Surface layer 3 Elastic layer 4 Containment space 4A Top opening of accommodation space 41 First chamber 42 Second chamber 5 First vibrating membrane 6 Recess 6A Ring portion 7 Second vibrating membrane 8 Third vibrating membrane 9 Intermediate sound absorbing layer AG1 First Helmholtz resonator AG2 Second Helmholtz resonator CN Connecting part E Elastic body H1 First hole H2 Second hole H3 Third hole P1 Sound absorbing panel material P2 Surface panel material P3 Intermediate sound absorption panel material S1 Sound insulation panel for automobiles

Claims (13)

The sound absorbing panel material that forms the sound absorbing layer,
A surface panel material that forms a surface layer on the sound absorbing layer,
A plurality of elastic bodies forming an elastic layer between the sound absorbing layer and the surface layer are provided.
The sound absorbing panel material is provided so as to be deformably provided along the unevenness of the surface of the automobile requiring sound insulation, and has a plurality of accommodating space portions opened toward the surface panel material.
In the surface panel material, the range facing the opening of the accommodation space functions as the first vibrating film.
Each of the elastic bodies has a recess arranged in the accommodation space, and the bottom of the recess functions as a second vibrating film. In order to make the bottom of the recess effectively function as the second vibrating film, a ring-shaped edge is formed at the bottom of the recess so that the inner region of the edge functions as the second vibrating film. The automobile sound insulation panel according to claim 1, further comprising the above. The sound absorbing panel material has a first hole and has a first hole.
The accommodating space is divided into two chambers by the first vibrating membrane of the elastic body and its peripheral portion.
A first Helmholtz resonator composed of the first chamber and the first hole by communicating the first hole with the first chamber located on the sound absorbing panel material side of the two chambers. The automobile sound insulation panel according to claim 1, wherein the sound insulation panel for an automobile is configured. The surface panel material has a second hole.
The accommodating space is divided into two chambers by the first vibrating membrane of the elastic body and its peripheral portion.
A second Helmholtz resonator composed of the second chamber and the second hole by communicating the second hole with the second chamber located on the surface panel material side of the two chambers. The automobile sound insulation panel according to claim 1, wherein the sound insulation panel for an automobile is configured. The sound insulation panel for an automobile according to claim 1, wherein an intermediate sound absorbing panel material forming an intermediate sound absorbing layer is provided between the surface layer and the elastic layer. The intermediate sound absorbing panel material has a third hole and has a third hole.
The accommodating space is divided into two chambers by the first vibrating membrane of the elastic body and its peripheral portion.
The third hole communicates with the chamber located on the intermediate sound absorbing panel material side of the two chambers, whereby a third Helmholtz resonator is formed by the chamber and the third hole. The automobile sound insulation panel according to claim 5. The sound insulation panel for an automobile according to claim 5, wherein the intermediate sound absorbing panel material has an opening in a range facing the upper surface opening of the accommodation space portion. The sound insulation panel for an automobile according to claim 1, wherein the bottom of the accommodation space portion is open. The sound insulation panel for an automobile according to claim 1, wherein the plurality of elastic bodies have an integrated structure by connecting their respective edges to each other by a connecting portion. The sound insulation panel for an automobile according to claim 1, wherein the plurality of elastic bodies have a single structure in which each of the elastic bodies exists independently and independently. The sound absorbing layer is a skin layer having properties different from those of other parts at least in the vicinity of the surface adjacent to the surface layer in the entire layer, and the range from the surface layer to the sound absorbing layer by the skin layer. The automobile sound insulation panel according to claim 1, wherein the overall air permeability is adjusted. The sound insulation panel for an automobile according to claim 11, wherein the skin layer is formed in the vicinity of a contact surface with the mold when the sound absorbing panel material is molded by the mold. The automobile sound insulation panel according to claim 11, wherein the skin layer is formed by retrofitting a separate member to the sound absorbing panel material.

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