JP4754836B2 - Double wall structure - Google Patents

Double wall structure Download PDF

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JP4754836B2
JP4754836B2 JP2005019017A JP2005019017A JP4754836B2 JP 4754836 B2 JP4754836 B2 JP 4754836B2 JP 2005019017 A JP2005019017 A JP 2005019017A JP 2005019017 A JP2005019017 A JP 2005019017A JP 4754836 B2 JP4754836 B2 JP 4754836B2
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wall structure
plate
double wall
double
sound
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JP2006208617A (en
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一樹 次橋
俊光 田中
宏樹 上田
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to JP2005019017A priority Critical patent/JP4754836B2/en
Priority to US11/795,154 priority patent/US20080128200A1/en
Priority to PCT/JP2005/022826 priority patent/WO2006080150A1/en
Priority to DE112005003394.5T priority patent/DE112005003394B4/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B60J5/04—Doors arranged at the vehicle sides
    • B60J5/0412—Lower door structure
    • B60J5/0418—Water or sound barrier, e.g. watershields or seals between dry/wet compartment, sound or vibration dampers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0815—Acoustic or thermal insulation of passenger compartments
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Superstructure Of Vehicle (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Description

本発明は二重壁構造体に係り、より詳細には、遮音性に優れる二重壁構造体の構成に関する。   The present invention relates to a double wall structure, and more particularly, to a configuration of a double wall structure excellent in sound insulation.

自動車に用いられる部品としてのドアやフード、トランクリッドなどに二重壁構造体を使用することが従来から提案されている（例えば、特許文献１及び２参照）。この従来例の構成を模式的に図１７に示す。この従来例の二重壁構造体１’は、所定の距離を隔てて相対する板状体２，３の間に内部空間４が形成されるとともに、当該内部空間４が側板５によって閉鎖された、中空箱状の構成（袋構造）とされている。
特開２００２−９６６３６号公報 特開２００３−１１８３６４号公報 Conventionally, it has been proposed to use a double wall structure for doors, hoods, trunk lids and the like as parts used in automobiles (see, for example, Patent Documents 1 and 2). FIG. 17 schematically shows the configuration of this conventional example. In the conventional double-wall structure 1 ′, an internal space 4 is formed between plate-like bodies 2 and 3 facing each other with a predetermined distance, and the internal space 4 is closed by a side plate 5. It has a hollow box-like configuration (bag structure).
JP 2002-96636 A JP 2003-118364 A

しかし、上記特許文献１に示すような二重壁構造体１’において、下側から騒音の音波が入射され、当該騒音が特定の周波数の音成分を含んでいると、その音成分に対し内部空間４での共鳴（主に板状体２，３に平行な方向の共鳴）が発生することによって、放射面たる上側の板状体３の振幅が増大してしまい、放射音の増大により遮音性能が低下してしまっていた。また、共鳴状態においては、側板５の付近において特に音圧が高くなる特徴がある。   However, in the double-wall structure 1 ′ as shown in Patent Document 1, when a sound wave of noise is incident from the lower side and the noise includes a sound component of a specific frequency, the sound component is internally The resonance in the space 4 (mainly in the direction parallel to the plate-like bodies 2 and 3) causes the amplitude of the upper plate-like body 3 serving as the radiation surface to increase, and the sound is insulated due to the increase in radiation sound. The performance was degraded. In the resonance state, the sound pressure is particularly high near the side plate 5.

本発明は以上の点に鑑みてされたものであり、その目的は、特定の周波数の音に対する音響透過量増大を抑制し、様々な周波数の音について安定して遮音性能を発揮し得る二重壁構造体を提供することにある。   The present invention has been made in view of the above points, and its purpose is to suppress an increase in the amount of sound transmission with respect to sound of a specific frequency, and to achieve a sound insulation performance stably for sound of various frequencies. It is to provide a wall structure.

課題を解決するための手段及び効果Means and effects for solving the problems

本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段とその効果を説明する。   The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

◆本発明の第１の観点によれば、相対する板状体の間に内部空間が形成されるとともに当該内部空間が完全に若しくはほぼ閉鎖されている二重壁構造体において、前記相対する板状体の間に多数の孔を有する多孔板が配置されており、この多孔板と二重壁構造体の周囲部材との間に空気層が介在されている、二重壁構造体が提供される。   ◆ According to the first aspect of the present invention, in a double wall structure in which an internal space is formed between opposing plate-like bodies and the internal space is completely or substantially closed, the opposing plates There is provided a double wall structure in which a porous plate having a large number of holes is disposed between the porous bodies, and an air layer is interposed between the porous plate and a peripheral member of the double wall structure. The

これにより、多孔板と周囲部材との間の空間（空気層）により形成される吸音機構により、周囲部材付近での音圧を有効に低減でき、内部空間全体の共鳴を抑えることができる。これにより内部空間の音圧が低下し、放射面側の加振力が低下するので、放射面の振動が減少し、音響透過損失を向上できる。また、多孔板の孔径、板厚、開口率、周囲部材との空気層の厚さを調整することにより、任意の周波数を特に効果的に抑える構成とすることもできる。   Thereby, the sound absorption mechanism formed by the space (air layer) between the perforated plate and the surrounding member can effectively reduce the sound pressure in the vicinity of the surrounding member, and the resonance of the entire internal space can be suppressed. As a result, the sound pressure in the internal space decreases and the excitation force on the radiation surface side decreases, so that the vibration on the radiation surface decreases and the sound transmission loss can be improved. Moreover, it can also be set as the structure which suppresses arbitrary frequencies especially effectively by adjusting the hole diameter of a perforated panel, board thickness, an aperture ratio, and the thickness of the air layer with a surrounding member.

◆前記の二重壁構造体においては、前記多孔板が前記周囲部材に対して傾斜するように配置されていても良い。   In the double wall structure, the perforated plate may be arranged to be inclined with respect to the surrounding member.

この構成によれば、内部空間でのあらゆる方向の共鳴を抑えることができ、遮音性に優れる二重壁構造体を提供できる。   According to this configuration, resonance in all directions in the internal space can be suppressed, and a double wall structure excellent in sound insulation can be provided.

◆前記の二重壁構造体においては、前記多孔板は複数設けられ、これら多孔板同士の間に空気層が介在されていることが好ましい。   In the double wall structure, it is preferable that a plurality of the perforated plates are provided, and an air layer is interposed between the perforated plates.

この構成によれば、２つの空気層により内部空間の共鳴を一層抑制できるから、遮音性に優れる二重壁構造体を提供できる。   According to this configuration, since the resonance of the internal space can be further suppressed by the two air layers, a double wall structure excellent in sound insulation can be provided.

◆前記の二重壁構造体においては、前記多孔板は前記周囲部材に接触するように設けられており、この接触部分において前記周囲部材には穴が形成されていても良い。なお、この穴の存在によっても、二重壁構造体の内部空間がほぼ閉鎖されている状態は維持される。   In the double wall structure, the perforated plate is provided so as to contact the peripheral member, and a hole may be formed in the peripheral member at the contact portion. Note that the presence of this hole maintains the state in which the internal space of the double wall structure is substantially closed.

これにより、内部空間に侵入したゴミや水等の異物を、前記穴を通じて容易に排出することができる。   Thereby, foreign matters such as dust and water that have entered the internal space can be easily discharged through the holes.

◆前記の二重壁構造体においては、前記多孔板と前記周囲部材との間の空間を仕切る仕切り体を有することが好ましい。   The above double wall structure preferably has a partition that partitions the space between the perforated plate and the surrounding member.

これにより、二重壁構造体の遮音性が向上される。   Thereby, the sound insulation of a double wall structure is improved.

◆前記の二重壁構造体においては、前記仕切り体には多数の孔が形成されていることが好ましい。   In the double wall structure, it is preferable that a large number of holes are formed in the partition.

これにより、二重壁構造体の遮音性が一層向上される。   Thereby, the sound insulation of a double wall structure is improved further.

◆前記の二重壁構造体においては、前記多孔板においては、その板厚、前記孔の孔径、前記孔の開口率、前記多孔板と前記周囲部材との間の空気層の厚さのうち少なくとも何れか一つを、前記仕切り体により仕切られる空間ごとに異ならせても良い。なお、仕切られた個々の空間において多孔板と周囲部材との間の空気層の厚さが均一でない場合は、仕切り体により仕切られる空間ごとにその空気層の代表厚さ（例えば、平均厚さ）が異なっていれば、上記の「空気層の厚さを・・・異ならせる」に該当する。また、前記仕切り体に孔が設けられている場合、その部材厚、前記孔の孔径、前記孔の開口率のうち少なくとも何れか一つを、前記仕切り体により仕切られる空間ごとに異ならせても良い。   In the double wall structure, in the porous plate, the thickness of the plate, the hole diameter of the hole, the opening ratio of the hole, and the thickness of the air layer between the porous plate and the surrounding member At least one of them may be different for each space partitioned by the partition body. When the thickness of the air layer between the perforated plate and the surrounding member is not uniform in each partitioned space, the representative thickness (for example, the average thickness) of the air layer for each space partitioned by the partition body ) Are different, it corresponds to the above-mentioned “Make air layer thickness different”. Further, in the case where a hole is provided in the partition body, at least one of the member thickness, the hole diameter of the hole, and the aperture ratio of the hole may be made different for each space partitioned by the partition body. good.

これにより、多孔板と周囲部材とで構成される吸音構造について、所望の周波数での吸音性能を発揮でき、特に良好な遮音性能を有する二重壁構造体を提供できる。   Thereby, about the sound absorption structure comprised with a perforated panel and a surrounding member, the sound absorption performance in a desired frequency can be exhibited, and the double wall structure which has especially favorable sound insulation performance can be provided.

◆前記の二重壁構造体においては、前記多孔板と前記相対する板状体の少なくとも何れか一方との間に制振防振部材が配置されていることが好ましい。   In the double wall structure, it is preferable that a vibration damping and vibration isolating member is disposed between the perforated plate and at least one of the opposing plate-like bodies.

これにより、二重壁構造体の遮音性をより向上させることができる。   Thereby, the sound insulation of a double wall structure can be improved more.

◆前記の二重壁構造体においては、前記多孔板の代わりに、一枚若しくは複数枚を積層した箔状体またはフィルム状体を配置しても良い。   In the double wall structure, a foil-like body or a film-like body in which one or a plurality of layers are laminated may be disposed instead of the perforated plate.

この場合でも、前述と同様に、箔状体またはフィルム状体と周囲部材との間の空間（空気層）により形成される吸音機構により、周囲部材付近での音圧を低減でき、内部空間全体の共鳴を抑えることができる。これにより内部空間の音圧が低下し、放射面側の加振力が低下するので、放射面の振動が減少し、音響透過損失を向上できる。この結果、遮音性に優れる構造体を得ることができる。   Even in this case, the sound pressure near the surrounding member can be reduced by the sound absorption mechanism formed by the space (air layer) between the foil-like body or the film-like body and the surrounding member, as described above, and the entire internal space can be reduced. Resonance can be suppressed. As a result, the sound pressure in the internal space decreases and the excitation force on the radiation surface side decreases, so that the vibration on the radiation surface decreases and the sound transmission loss can be improved. As a result, a structure having excellent sound insulation can be obtained.

◆前記の二重壁構造体においては、前記箔状体またはフィルム状体に多数の孔が形成されていることが好ましい。   In the double wall structure, it is preferable that a large number of holes are formed in the foil or film.

これにより、二重壁構造体の遮音性を一層向上させることができる。   Thereby, the sound insulation of a double wall structure can be improved further.

◆本発明の第２の観点によれば、相対する板状体の間に内部空間が形成されるとともに当該内部空間が完全に若しくはほぼ閉鎖されている二重壁構造体において、二重壁構造体の周囲部材付近に多孔質体が配置されている、二重壁構造体が提供される。   ◆ According to the second aspect of the present invention, in the double wall structure in which the internal space is formed between the opposing plate-like bodies and the internal space is completely or substantially closed, the double wall structure A double wall structure is provided in which a porous body is disposed near a body periphery.

これにより、（周囲部材付近に配置された）多孔質体によって周囲部材付近での音圧を低減でき、内部空間全体の共鳴を抑えることができる。これにより内部空間の音圧が低下し、放射面側の加振力が低下するので、放射面の振動が減少し、多孔質体自体の吸音効果とあいまって、音響透過損失を向上できる。この結果、遮音性に優れる構造体を得ることができる。   Thereby, the sound pressure in the vicinity of the peripheral member can be reduced by the porous body (arranged in the vicinity of the peripheral member), and resonance in the entire internal space can be suppressed. As a result, the sound pressure in the internal space is reduced and the excitation force on the radiation surface side is reduced, so that the vibration on the radiation surface is reduced, and the sound transmission loss can be improved in combination with the sound absorption effect of the porous body itself. As a result, a structure having excellent sound insulation can be obtained.

次に、発明の実施の形態を説明する。図１から図１６までには二重壁構造体の実施例がそれぞれ示されており、以下、順を追って説明する。   Next, embodiments of the invention will be described. Examples of double-wall structures are shown in FIGS. 1 to 16, respectively, and will be described below in order.

図１及び図２に模式図を示す実施例１−１の二重壁構造体は、乗用車の部品としてのドアを想定したものである。この二重壁構造体１は、互いに平行に配置されるとともに所定の距離をおいて相対する板状体２，３を備えている。板状体２，３は一方向に若干長い長方形状に構成されており、２枚の対向する板状体２，３の間には、内部空間４が形成される。板状体２，３の縁部同士を繋ぐように４枚の側板（周囲部材）５が設けられており、これによって内部空間４はほぼ閉鎖される。言い換えれば本実施形態の二重壁構造体１は、二重壁たる板状体２，３と、前記側板５とで、前記内部空間４を囲む袋構造に構成されている。   The double wall structure of Example 1-1 whose schematic diagram is shown in FIGS. 1 and 2 assumes a door as a passenger car component. The double wall structure 1 includes plate-like bodies 2 and 3 which are arranged in parallel to each other and face each other at a predetermined distance. The plate-like bodies 2 and 3 are formed in a rectangular shape that is slightly longer in one direction, and an internal space 4 is formed between the two opposing plate-like bodies 2 and 3. Four side plates (surrounding members) 5 are provided so as to connect the edge portions of the plate-like bodies 2 and 3, and thereby the internal space 4 is almost closed. In other words, the double wall structure 1 of the present embodiment is configured in a bag structure that surrounds the internal space 4 with the plate-like bodies 2 and 3 that are double walls and the side plate 5.

そして本実施形態では、前記内部空間４を仕切るように、矩形板状の微細多孔板１３を設けている。各微細多孔板１３は、微細な貫通孔（微細孔８）を多数形成した構成となっている。この実施例１−１では、４枚の微細多孔板１３を矩形状に配置して、二重壁構造体１の内部空間４を、中心側と、側板５に近い周囲側の２つの空間に区画している。言い換えれば、それぞれの微細多孔板１３は４枚の前記側板５に対し所定の間隔をあけて平行に配置されており、微細多孔板１３と側板５との間には、前記間隔の分だけの厚みの空気層Ａが介在される。なお、微細多孔板１３の素材としては、例えば、鉄、アルミ、樹脂、繊維強化複合材料、紙などを採用できる。   In the present embodiment, a rectangular porous micro-porous plate 13 is provided so as to partition the internal space 4. Each fine porous plate 13 has a structure in which a large number of fine through holes (micro holes 8) are formed. In Example 1-1, four microporous plates 13 are arranged in a rectangular shape, and the internal space 4 of the double wall structure 1 is divided into two spaces on the center side and on the peripheral side close to the side plate 5. It is partitioned. In other words, each microporous plate 13 is arranged in parallel with a predetermined interval with respect to the four side plates 5, and between the microporous plate 13 and the side plate 5, an amount corresponding to the interval is provided. A thick air layer A is interposed. In addition, as a raw material of the fine porous board 13, iron, aluminum, resin, a fiber reinforced composite material, paper etc. are employable, for example.

上記構成において、図１の下側から板状体２側が騒音によって音圧加振される場合を考える。騒音が特定の周波数の音成分を含んでいると、板状体２が振動することにより内部空間４の長手方向又は短手方向で共鳴が起ころうとする。この共鳴モードでは特に、側板５付近での音圧が高くなる。しかしながら、微細多孔板１３と側板５とその間の空気層Ａによって構成される吸音機構により、その音圧の高い側板５付近の音圧が特に効果的に低減されるため、共鳴モードが形成されにくくなり、共鳴が抑制される。以上の結果、放射面たる上側の板状体３の加振力が低下するので、放射面の振幅が低減され、音響透過損失の落込みを低減できる。   In the above configuration, consider the case where the plate-like body 2 side is subjected to sound pressure excitation by noise from the lower side of FIG. When the noise includes a sound component having a specific frequency, the plate-like body 2 vibrates, and resonance tends to occur in the longitudinal direction or the lateral direction of the internal space 4. Particularly in this resonance mode, the sound pressure near the side plate 5 becomes high. However, the sound absorption mechanism constituted by the fine porous plate 13, the side plate 5 and the air layer A therebetween reduces the sound pressure in the vicinity of the side plate 5 having a high sound pressure, so that the resonance mode is hardly formed. And resonance is suppressed. As a result, since the excitation force of the upper plate-like body 3 serving as the radiation surface is reduced, the amplitude of the radiation surface is reduced, and the drop in sound transmission loss can be reduced.

実施例１−２（図３）の構成では、微細多孔板１３は、二重壁構造体１の４枚の前記側板５のうちの１枚の近傍に設置されている。微細多孔板１３は図３において略Ｖ字状をなすように、側板５に対して傾斜して配置されている。この結果、微細多孔板１３と側板５との間には三角形状の空気層Ａが形成される。この構成では、共鳴モード時に特に音圧の高いコーナー部（隅部）に対して空気層Ａが配置される構成となり、このコーナー部の音圧を良好に低減できる。また、微細多孔板１３が側板５に対して傾斜するように配置されていることから、内部空間４でのあらゆる方向の共鳴を抑えることができ、二重壁構造体１の遮音性を向上させることができる。   In the configuration of Example 1-2 (FIG. 3), the fine porous plate 13 is installed in the vicinity of one of the four side plates 5 of the double wall structure 1. The fine porous plate 13 is disposed so as to be inclined with respect to the side plate 5 so as to be substantially V-shaped in FIG. As a result, a triangular air layer A is formed between the fine porous plate 13 and the side plate 5. In this configuration, the air layer A is disposed at a corner portion (corner portion) where the sound pressure is particularly high in the resonance mode, and the sound pressure at the corner portion can be favorably reduced. Further, since the fine porous plate 13 is disposed so as to be inclined with respect to the side plate 5, resonance in all directions in the internal space 4 can be suppressed, and the sound insulation of the double wall structure 1 is improved. be able to.

実施例１−３（図４）の構成では、実施例１−２（図３）の構成に対して微細多孔板１３を更に追加し、複数の微細多孔板１３・１３同士を平行に配置して、両微細多孔板１３・１３の間に厚み方向の隙間を形成している。この結果、両微細多孔板１３・１３の間に空気層Ｂが介在される。即ち、この実施例１−３では、微細多孔板１３と側板５との間の空気層Ａ、及び微細多孔板１３・１３の間の空気層Ｂの２つの空気層が形成される。従って、共鳴抑制効果を一層大とできる。   In the configuration of Example 1-3 (FIG. 4), a microporous plate 13 is further added to the configuration of Example 1-2 (FIG. 3), and a plurality of microporous plates 13 and 13 are arranged in parallel. Thus, a gap in the thickness direction is formed between both fine porous plates 13 and 13. As a result, the air layer B is interposed between the fine porous plates 13 and 13. That is, in Example 1-3, two air layers are formed, that is, an air layer A between the fine porous plate 13 and the side plate 5 and an air layer B between the fine porous plates 13 and 13. Therefore, the resonance suppression effect can be further increased.

実施例１−４−１（図５）の構成は、微細多孔板１３を傾斜状に配置した実施例１−２の構成（図３）に対して、側板５の、微細多孔板１３と接触する部分に穴１０を形成したものである。この穴１０により、内部空間４に侵入したゴミや水等の異物を容易に排出させることができる。また、この穴１０は、側板５の空気層Ａに対面しない部位に設けられているから、空気層Ａによる吸音作用は妨げられない。なお、実施例１−４−２（図６）のように、微細多孔板１３を略Ｗ字状に配置し、穴１０を２つ形成しても良い。このように、微細多孔板１３の傾斜の形態と穴１０の個数は限定されるものではない。   The configuration of Example 1-4-1 (FIG. 5) is in contact with the microporous plate 13 of the side plate 5 as compared to the configuration of Example 1-2 (FIG. 3) in which the microporous plate 13 is arranged in an inclined manner. A hole 10 is formed in a portion to be performed. With this hole 10, foreign matters such as dust and water that have entered the internal space 4 can be easily discharged. Moreover, since this hole 10 is provided in the site | part which does not face the air layer A of the side plate 5, the sound absorption effect | action by the air layer A is not prevented. In addition, like Example 1-4-2 (FIG. 6), the fine porous board 13 may be arrange | positioned in substantially W shape, and the two holes 10 may be formed. Thus, the inclined form of the fine porous plate 13 and the number of the holes 10 are not limited.

実施例２−１（図７）の構成は、実施例１−１（図１，図２）の変形例であって、側板５と微細多孔板１３とを繋ぐように板状の仕切り体９を複数設け、この仕切り体９が、側板５と微細多孔板１３との間に介在される空気層Ａを、二重壁構造体１の長手方向及び幅方向に区画している。なお、微細多孔板１３と側板５との間の空気層の延在方向の共鳴現象が所望の周波数で起こりにくい位置に仕切り体９を設けるのが好ましい。即ち、遮音性を向上させたい周波数に対する波長の１／２の整数倍と一致しない間隔で、仕切り体９を設けるのである。これにより、微細多孔板１３と側板５との間の空気層Ａで構成される吸音機構の吸音性能を高めることができる。また、この構成においては、狙った周波数で吸音性能を高めるために、仕切り体９で仕切られた各空間ごとに、前記微細孔８の孔径、開口率を異ならせたり、微細多孔板１３の板厚を異ならせたりしても良い。また、仕切り体９は板状とすることに限定されず、例えば塊状に形成された補強用発泡剤で仕切り体を構成しても良い。   The configuration of Example 2-1 (FIG. 7) is a modification of Example 1-1 (FIGS. 1 and 2), and a plate-like partition 9 that connects the side plate 5 and the fine porous plate 13. The partition body 9 partitions the air layer A interposed between the side plate 5 and the fine porous plate 13 in the longitudinal direction and the width direction of the double wall structure 1. In addition, it is preferable to provide the partition body 9 in a position where the resonance phenomenon in the extending direction of the air layer between the microporous plate 13 and the side plate 5 hardly occurs at a desired frequency. That is, the partitions 9 are provided at intervals that do not coincide with an integral multiple of 1/2 of the wavelength with respect to the frequency for which sound insulation is desired to be improved. Thereby, the sound absorption performance of the sound absorption mechanism constituted by the air layer A between the fine porous plate 13 and the side plate 5 can be enhanced. Further, in this configuration, in order to improve the sound absorption performance at the targeted frequency, the hole diameter and the opening ratio of the fine holes 8 are made different for each space partitioned by the partition body 9, or the plate of the fine porous plate 13 is used. The thickness may be varied. Moreover, the partition 9 is not limited to plate shape, For example, you may comprise a partition with the foaming agent for reinforcement formed in the lump shape.

実施例２−２−１（図８）の構成は、実施例１−２（図３）と実施例２−１（図７）とを組み合わせたものに相当する。この構成では、仕切り体９で囲まれた空間ごとに、微細多孔板１３と側板５との間の空気層Ａの厚さ（平均厚さ）を異ならせている。実施例２−２−２（図９）のように、前記実施例１−４−１と同様に側板５に穴１０を形成しても良い。   The configuration of Example 2-2-1 (FIG. 8) corresponds to a combination of Example 1-2 (FIG. 3) and Example 2-1 (FIG. 7). In this configuration, the thickness (average thickness) of the air layer A between the fine porous plate 13 and the side plate 5 is made different for each space surrounded by the partitions 9. As in Example 2-2-2 (FIG. 9), the holes 10 may be formed in the side plate 5 in the same manner as in Example 1-4-1.

実施例２−３−１（図１０）の構成は、実施例１−３（図４）と実施例２−２−１（図８）とを組み合わせたものに相当する。仕切り体９は、２つの空気層Ａ，Ｂを何れも区画するように設置されている。   The configuration of Example 2-3-1 (FIG. 10) corresponds to a combination of Example 1-3 (FIG. 4) and Example 2-2-1 (FIG. 8). The partition body 9 is installed so as to partition both the two air layers A and B.

実施例２−３−２（図１１）の構成は、実施例２−１（図７）に対し、微細多孔板１３・１３を厚み方向に複数設け、その間に空気層Ｂを介在させるように変形を加えたものである。   The configuration of Example 2-3-2 (FIG. 11) is such that a plurality of fine porous plates 13 and 13 are provided in the thickness direction with respect to Example 2-1 (FIG. 7), and an air layer B is interposed therebetween. It is a modification.

実施例２−４（図１２）の構成は、実施例２−１（図７）の仕切り体９に微細孔８を多数形成したものである。   In the configuration of Example 2-4 (FIG. 12), a large number of fine holes 8 are formed in the partition body 9 of Example 2-1 (FIG. 7).

図１３には実施例３−１−１の二重壁構造体１の断面図が示されており、この図１３に示すように微細多孔板１３が、加振側の板状体２や反対側の板状体３に対して完全な気密をもって接触できず、ある程度の隙間（スリット）が形成されてしまう場合がある。このようなスリットは無い方が好ましいので、この実施例では、そのスリットに相当する部分に、ゴム、ウレタン等の部材からなる制振防振部材１６を設置している。この結果、吸音機構の吸音性能を高めることができている。実施例３−１−２（図１４）に示すように、制振防振部材１６は、微細多孔板１３と、２枚の板状体２，３のうち何れか一方のみとの間に設けられていても良い。なお、上記のスリットが微細な隙間であった場合には、制振防振部材１６を省略して、そのスリット自体に吸音作用を奏させるようにすることもできる。   FIG. 13 shows a cross-sectional view of the double wall structure 1 of Example 3-1-1. As shown in FIG. 13, the microporous plate 13 is opposite to the plate-like body 2 on the excitation side or the opposite side. In some cases, the plate-like body 3 on the side cannot be contacted with perfect airtightness, and a certain amount of gaps (slits) may be formed. Since it is preferable that there is no such slit, in this embodiment, a vibration damping and vibration isolating member 16 made of a member such as rubber or urethane is installed in a portion corresponding to the slit. As a result, the sound absorbing performance of the sound absorbing mechanism can be improved. As shown in Example 3-1-2 (FIG. 14), the vibration control member 16 is provided between the microporous plate 13 and only one of the two plate-like bodies 2 and 3. It may be done. When the slit is a fine gap, the vibration damping and vibration preventing member 16 can be omitted and the slit itself can have a sound absorbing effect.

実施例４−１（図１５）は、実施例２−２−１（図８）における微細多孔板１３の代わりに、複数枚積層した箔状体又はフィルム状体１４を設けたものである。この実施例４−１においては、吸音性の向上のために箔状体又はフィルム状体１４には多数の微細孔８が形成されているが、微細孔８を設けない構成としても良い。また、箔状体又はフィルム状体は、複数枚積層させずに、単一枚で設置しても良い。   In Example 4-1 (FIG. 15), instead of the fine porous plate 13 in Example 2-2-1 (FIG. 8), a plurality of laminated foil-like bodies or film-like bodies 14 are provided. In Example 4-1, a large number of micropores 8 are formed in the foil-like body or the film-like body 14 in order to improve sound absorption, but a configuration in which the micropores 8 are not provided may be employed. Further, the foil-like body or the film-like body may be installed as a single sheet without being laminated.

実施例５−１（図１６）では、二重壁構造体１の側板５の付近に２つの多孔質体１５，１５を配置した構成になっている。この多孔質体１５の素材としては、グラスウールやフェルト等のほか、例えばＰＥＴ系繊維や、ポリウレタンや、連続気泡の発泡材を用いることができる。この実施例５−１では多孔質体１５は三角形状に構成して、それぞれを前記内部空間４の一側の二つの隅に配置し、前記側板５に接触するように配置しているが、多孔質体１５の形状や配置については上記に限定されない。この構成では、共鳴時の音圧の特に高い部位（側板５付近、特に内部空間４のコーナー部付近）を重点的に吸音することにより、内部空間４全体の共鳴時の音圧を低減でき、音響透過損失を向上できる。   In Example 5-1 (FIG. 16), two porous bodies 15 and 15 are disposed in the vicinity of the side plate 5 of the double wall structure 1. As the material of the porous body 15, in addition to glass wool, felt, etc., for example, PET fibers, polyurethane, and open-cell foamed materials can be used. In this Example 5-1, the porous body 15 is configured in a triangular shape, and each is disposed at two corners on one side of the internal space 4 so as to be in contact with the side plate 5. The shape and arrangement of the porous body 15 are not limited to the above. In this configuration, the sound pressure at the time of resonance of the entire internal space 4 can be reduced by intensively absorbing the portion where the sound pressure at the time of resonance is particularly high (near the side plate 5, particularly near the corner portion of the internal space 4). Sound transmission loss can be improved.

上記の実施形態の有効性を確認するために、以下のような実験を行った。即ち、実施例１−１〜１−３，２−１，２−２−１，２−３−１，２−３−２，４−１，５−１のそれぞれの構造の二重壁構造体１を、音源室、受音室からなる残響室における両室の間の位置に設置し、ＪＩＳ Ａ１４１６に基づいて二重壁構造体１の片側から適宜の騒音を発生させ、二重壁構造体１を挟んだ両側で騒音計を用いて音圧を計測して、音響透過損失を求めた。   In order to confirm the effectiveness of the above embodiment, the following experiment was performed. That is, the double wall structure of each structure of Examples 1-1 to 1-3, 2-1, 2-1, 2-1, 3-1, 2-3-2, 4-1, 5-1 The body 1 is installed at a position between the two rooms in the reverberation room including the sound source room and the sound receiving room, and appropriate noise is generated from one side of the double wall structure 1 based on JIS A1416. The sound transmission loss was obtained by measuring the sound pressure using a sound level meter on both sides of the body 1.

この結果を図１８〜図２０に示す。なお、これらのグラフのそれぞれには、従来例の構造（図１７）について同様の実験を行った結果も併せて示してある。図１８のグラフに示すように、従来例に対して実施例１−１〜１−３の構成においては、前記微細多孔板１３による共鳴モード抑制のため、音響透過損失が向上しており、遮音性能を向上できていることが判る。また、実施例２−１，２−２−１，２−３−１，２−３−２の構成（図１９）や、実施例４−１，５−１の構成（図２０）においても同様に、微細多孔板１３や多孔質体１５による共鳴モード抑制作用により、音響透過損失が向上しており、遮音性能を向上できていることが判る。   The results are shown in FIGS. Each of these graphs also shows the result of a similar experiment performed on the structure of the conventional example (FIG. 17). As shown in the graph of FIG. 18, in the configurations of Examples 1-1 to 1-3 with respect to the conventional example, the sound transmission loss is improved due to the suppression of the resonance mode by the fine porous plate 13, and sound insulation is performed. It can be seen that the performance has been improved. In addition, in the configurations of Examples 2-1, 2-1, 2-3-1, 1-2-3-2 (FIG. 19) and the configurations of Examples 4-1, 5-1 (FIG. 20) as well. Similarly, it can be seen that the sound transmission loss is improved by the resonance mode suppressing action of the fine porous plate 13 and the porous body 15, and the sound insulation performance can be improved.

以上に本発明の好適な実施形態を示したが、本発明の技術的範囲は以上の実施形態に限定されるものではなく、様々に変形して実施することができる。   The preferred embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the above embodiments, and various modifications can be made.

例えば本発明の二重壁構造体は、乗用車のドアのみならず、例えばフード、トランクリッドに適用することができる。また、板状体２，３の形状については、上記のような長方形とすることに限らず、必要とされる部品の形状に応じて種々変更され得ることは言うまでもない。   For example, the double wall structure of the present invention can be applied not only to passenger car doors but also to hoods and trunk lids, for example. Further, the shape of the plate-like bodies 2 and 3 is not limited to the rectangular shape as described above, and it goes without saying that various changes can be made according to the shape of the required component.

また、共鳴が生じる音圧モードの方向や次数は、二重壁構造体１の形状や騒音源との位置関係などの様々な事情により異なるので、微細多孔板１３の向きや厚み、枚数、微細孔８の個数、孔径、形状、開口率等は、上記の事情を考慮して適宜定めて良い。即ち、微細多孔板１３や多孔質体１５をどこに幾つ設けるか等については、想定される騒音による二重壁構造体１の内部空間４内の共鳴モードを考慮して、最適な位置と個数を決定すれば良い。また、前述の複数の実施例で微細多孔板１３や仕切り体９、箔状体又はフィルム状体１４に設けられていた微細孔８は、その孔径を増大させ、「微細」と言えないような大きさの孔としても良い。また、二重壁構造体１を乗用車用のドアに適用する場合には、内部空間４に様々な機器や補強材を配置することが想定されるので、それを避けた位置に微細多孔板１３や多孔質体１５を設けることとしても勿論差し支えない。   Also, the direction and order of the sound pressure mode in which resonance occurs varies depending on various circumstances such as the shape of the double wall structure 1 and the positional relationship with the noise source. The number, the hole diameter, the shape, the opening ratio, etc. of the holes 8 may be appropriately determined in consideration of the above circumstances. That is, as to where and how many fine porous plates 13 and porous bodies 15 are provided, the optimum position and number are determined in consideration of the resonance mode in the internal space 4 of the double wall structure 1 due to assumed noise. Just decide. Further, the fine holes 8 provided in the fine porous plate 13, the partition 9, the foil-like body, or the film-like body 14 in the plurality of embodiments described above increase the hole diameter and cannot be said to be “fine”. It is good also as a hole of a size. Further, when the double wall structure 1 is applied to a door for a passenger car, it is assumed that various devices and reinforcing materials are arranged in the internal space 4, and therefore the microporous plate 13 is disposed at a position avoiding that. Of course, the porous body 15 may be provided.

上述の微細多孔板１３や多孔質体１５は、側板５の全周に設けても良いし、一部にのみ設けても良い。例えば、実施例１−２（図３）の微細多孔板１３は、４枚のうちの１枚の側板５との間にのみ空気層Ａを介在させるように設けているが、内部空間４の全周を取り囲むように配置しても構わない。   The fine porous plate 13 and the porous body 15 described above may be provided on the entire circumference of the side plate 5 or may be provided only on a part thereof. For example, although the microporous plate 13 of Example 1-2 (FIG. 3) is provided so that the air layer A is interposed only between one of the four side plates 5, You may arrange | position so that the perimeter may be surrounded.

上述の複数の実施例では、微細多孔板１３や仕切り体９は板状体２，３に垂直な向きに設置されているが、これに限定されず、板状体２，３に対して傾斜するように微細多孔板１３や仕切り体９等を設置しても良い。   In the above-described embodiments, the fine porous plate 13 and the partition body 9 are installed in a direction perpendicular to the plate-like bodies 2, 3, but are not limited to this, and are inclined with respect to the plate-like bodies 2, 3. As described above, the fine porous plate 13 or the partition 9 may be installed.

また、上述の実施例は、それぞれが単独で適用される場合に限定されず、複数の実施例を組み合わせて適用しても良い。   Moreover, the above-mentioned Example is not limited to when each is applied independently, You may apply combining several Example.

本発明の二重壁構造体の実施例１−１の模式斜視図。The schematic perspective view of Example 1-1 of the double wall structure of this invention. 実施例１−１の模式図。The schematic diagram of Example 1-1. 実施例１−２の模式図。The schematic diagram of Example 1-2. 実施例１−３の模式図。The schematic diagram of Example 1-3. 実施例１−４−１の模式図。The schematic diagram of Example 1-4-1. 実施例１−４−２の模式図。The schematic diagram of Example 1-4-2. 実施例２−１の模式図。The schematic diagram of Example 2-1. 実施例２−２−１の模式図。Schematic diagram of Example 2-2-1. 実施例２−２−２の模式図。The schematic diagram of Example 2-2-2. 実施例２−３−１の模式図。The schematic diagram of Example 2-3-1. 実施例２−３−２の模式図。The schematic diagram of Example 2-3-2. 実施例２−４の模式図。The schematic diagram of Example 2-4. 実施例３−１−１の模式断面図。The schematic cross section of Example 3-1-1. 実施例３−１−２の模式断面図。The schematic cross section of Example 3-1-2. 実施例４−１の模式図。The schematic diagram of Example 4-1. 実施例５−１の模式図。The schematic diagram of Example 5-1. 従来例の二重壁構造体の構成を示す斜視図。The perspective view which shows the structure of the double wall structure of a prior art example. 実施例１−１〜１−３の音響透過抑制効果を従来例と比較して示すグラフ図。The graph which shows the sound transmission suppression effect of Examples 1-1 to 1-3 compared with a prior art example. 実施例２−１，２−２−１，２−３−１，２−３−２の音響透過抑制効果を従来例と比較して示すグラフ図。The graph figure which shows the sound transmission suppression effect of Example 2-1, 2-1, 2-3-1, 2-3-3-2 compared with a prior art example. 実施例４−１，５−１の音響透過抑制効果を従来例と比較して示すグラフ図。The graph which shows the sound transmission suppression effect of Examples 4-1 and 5-1 compared with a prior art example.

符号の説明Explanation of symbols

１ 二重壁構造体
２ 加振側の板状体
３ 板状体
４ 内部空間
５ 側板
８ 微細孔（孔）
９ 仕切り体
１０ 穴
１３ 微細多孔板（多孔板）
１４ フィルム状体又は箔状体
１５ 多孔質体
Ａ 空気層
Ｂ 空気層 DESCRIPTION OF SYMBOLS 1 Double wall structure 2 Excitation side plate-like body 3 Plate-like body 4 Internal space 5 Side plate 8 Fine hole (hole)
9 partition 10 hole 13 micro perforated plate (perforated plate)
14 Film-like body or foil-like body 15 Porous body A Air layer B Air layer

Claims (8)

相対する板状体の間に内部空間が形成されるとともに当該内部空間が完全に若しくはほぼ閉鎖されている二重壁構造体において、前記相対する板状体の間に多数の孔を有する多孔板が配置されており、この多孔板と二重壁構造体の周囲部材との間に空気層が介在され、
前記多孔板は、前記周囲部材に対して傾斜し、且つ前記周囲部材に接触するように配置され、この接触部分において前記周囲部材には穴が形成されていることを特徴とする二重壁構造体。 In a double wall structure in which an internal space is formed between opposing plate-like bodies and the internal space is completely or substantially closed, a perforated plate having a large number of holes between the opposing plate-like bodies Is disposed, an air layer is interposed between the perforated plate and the peripheral member of the double wall structure ,
The perforated plate is disposed so as to be inclined with respect to the peripheral member and to be in contact with the peripheral member, and a hole is formed in the peripheral member at the contact portion. body. 請求項１に記載の二重壁構造体であって、前記多孔板は複数設けられ、これら多孔板同士の間に空気層が介在されていることを特徴とする二重壁構造体。 2. The double wall structure according to claim 1 , wherein a plurality of the perforated plates are provided, and an air layer is interposed between the perforated plates. 請求項１又は請求項２に記載の二重壁構造体であって、前記多孔板と前記周囲部材との間の空間を仕切る仕切り体を有することを特徴とする二重壁構造体。 A double-wall structure according to claim 1 or claim 2, double wall structure and having a partition member for partitioning the space between the peripheral member and the porous plate. 請求項３に記載の二重壁構造体であって、前記仕切り体には多数の孔が形成されていることを特徴とする二重壁構造体。 4. The double wall structure according to claim 3 , wherein a number of holes are formed in the partition body. 請求項３又は請求項４に記載の二重壁構造体であって、前記仕切り体により仕切られる空間ごとに、前記多孔板の板厚、前記仕切り体の部材厚、前記多孔板又は前記仕切り体に設けられた前記孔の孔径、前記孔の開口率、前記多孔板と前記周囲部材との間の空気層の厚さのうち少なくとも何れか一つを異ならせていることを特徴とする二重壁構造体。 A double-wall structure according to claim 3 or claim 4, for each space partitioned by the partition member, the plate thickness of the porous plate, member thickness of the partition member, the perforated plate or the partition body At least one of a hole diameter of the hole provided in the hole, an opening ratio of the hole, and a thickness of an air layer between the perforated plate and the surrounding member is different. Wall structure. 請求項１から請求項５までの何れか一項に記載の二重壁構造体であって、前記多孔板と前記相対する板状体の少なくとも何れか一方との間に制振防振部材が配置されていることを特徴とする二重壁構造体。 It is a double wall structure as described in any one of Claim 1- Claim 5 , Comprising: A vibration suppression vibration isolating member is between at least any one of the said perforated panel and the said opposing plate-shaped body. A double-walled structure characterized by being arranged. 請求項１から請求項５までの何れか一項に記載の二重壁構造体であって、前記多孔板の代わりに、一枚若しくは複数枚を積層した箔状体またはフィルム状体を配置したことを特徴とする二重壁構造体。 It is the double wall structure as described in any one of Claim 1- Claim 5 , Comprising: Instead of the said perforated plate, the foil-like body or film-like body which laminated | stacked the 1 sheet or several sheets was arrange | positioned. A double wall structure characterized by that. 請求項７に記載の二重壁構造体であって、前記箔状体またはフィルム状体に多数の孔が形成されていることを特徴とする二重壁構造体。 The double-wall structure according to claim 7 , wherein a plurality of holes are formed in the foil-like body or the film-like body.
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