JP6858671B2 - Sound absorbing material mounting structure - Google Patents

Sound absorbing material mounting structure Download PDF

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JP6858671B2
JP6858671B2 JP2017163907A JP2017163907A JP6858671B2 JP 6858671 B2 JP6858671 B2 JP 6858671B2 JP 2017163907 A JP2017163907 A JP 2017163907A JP 2017163907 A JP2017163907 A JP 2017163907A JP 6858671 B2 JP6858671 B2 JP 6858671B2
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sound absorbing
absorbing material
notch
mounting structure
mounting
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JP2019040147A (en
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吉起 松村
吉起 松村
一哉 佐伯
一哉 佐伯
貴彦 有吉
貴彦 有吉
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Tigers Polymer Corp
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  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Exhaust Silencers (AREA)
  • Duct Arrangements (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Description

本発明は、その内部に空気などの気体を流通させる通気経路に吸音材を取付ける吸音材取付構造に関する。特に通気経路の一部を構成する部材の内周面に吸音材を固定して、通気経路内を伝播する騒音の低減を図った吸音材取付構造に関する。 The present invention relates to a sound absorbing material mounting structure in which a sound absorbing material is attached to a ventilation path through which a gas such as air flows. In particular, the present invention relates to a sound absorbing material mounting structure in which a sound absorbing material is fixed to the inner peripheral surface of a member constituting a part of the ventilation path to reduce noise propagating in the ventilation path.

内燃機関への空気の供給や、空冷装置、エアコン装置などにおける送風など、多様な分野において、ダクト部材などで通気経路を構成し、通気経路を通じて空気を送ることが行われている。これら通気経路は、近年では、自動車の内燃機関の吸気系に使用されるばかりでなく、燃料電池自動車や電気自動車などに備えられた2次電池(蓄電池)を冷却するための冷却風送風システムに使用されたりもして、広く活用されている。こうした通気経路は、騒音の伝達経路となることも多いため、これら通気経路の構成においては、空気流路を形成するダクトや、拡径されたチャンバー部分の内面に、繊維集合体や合成樹脂発泡材(いわゆるスポンジ)などからなる吸音材を取り付けて、いわゆる吸音ダクトとして構成し、通気経路内を伝播する騒音の音響エネルギーを吸収させて、比較的幅広い周波数領域に亘って騒音低減を図ることが行われている。 In various fields such as supplying air to an internal combustion engine and blowing air in an air cooling device, an air conditioner, etc., a ventilation path is formed by a duct member or the like, and air is sent through the ventilation path. In recent years, these ventilation paths have been used not only in the intake system of internal combustion engines of automobiles, but also in cooling air ventilation systems for cooling secondary batteries (storage batteries) installed in fuel cell vehicles and electric vehicles. It is also used and is widely used. Since such a ventilation path often serves as a noise transmission path, in the configuration of these ventilation paths, a fiber aggregate or synthetic resin foam is formed on the inner surface of the duct forming the air flow path or the enlarged chamber portion. A sound absorbing material made of a material (so-called sponge) can be attached to form a so-called sound absorbing duct to absorb the acoustic energy of noise propagating in the ventilation path to reduce noise over a relatively wide frequency range. It is done.

そのような吸音ダクトにおいて、通気経路の内周面に吸音材を取付ける構造としては種々のものが知られている。例えば、特許文献1には、吸音材をダクトの内面に貼付したものが記載されており、特許文献2には、樋状のダクト部材を対向させて結合することによりダクトを形成し、一方のダクト部材に配置した吸音材を、他方のダクト部材に一体的に形成されダクト軸方向に平行な押え板(リブ)の先端で押圧固定して吸音ダクトを構成する吸音材取付構造が記載されている。その他、吸音材をダクト内に固定する構造としては、接着剤や両面テープを使用した構造、吸音材を所定の空間に充填した構造や、ピン部材や爪部材を利用してこれら部材に吸音材を係止させて取付ける構造などが知られている。例えば特許文献3には、カバー部材に立設されたボスに吸音材を貫通させて、ボス先端をかしめて吸音材を固定することが開示されている。 In such a sound absorbing duct, various structures are known in which a sound absorbing material is attached to the inner peripheral surface of the ventilation path. For example, Patent Document 1 describes a sound absorbing material attached to the inner surface of a duct, and Patent Document 2 describes a duct formed by connecting duct-shaped duct members so as to face each other. Described is a sound absorbing material mounting structure in which a sound absorbing material arranged on a duct member is integrally formed on the other duct member and pressed and fixed by the tip of a holding plate (rib) parallel to the duct axial direction to form a sound absorbing duct. There is. In addition, as a structure for fixing the sound absorbing material in the duct, a structure using an adhesive or double-sided tape, a structure in which the sound absorbing material is filled in a predetermined space, and a sound absorbing material for these members using a pin member or a claw member. There is a known structure in which the double-sided tape is locked and attached. For example, Patent Document 3 discloses that a sound absorbing material is passed through a boss erected on a cover member, and the tip of the boss is crimped to fix the sound absorbing material.

特開平11−117761号公報Japanese Unexamined Patent Publication No. 11-117761 特開平09−49417号公報Japanese Unexamined Patent Publication No. 09-49417 実開全文平02−85863号Jitsukai Zenbunpei 02-85863

通気経路内部に吸音材を取付けるには、通気経路内部の空気の流れを妨げないよう、気流によって吸音材がずれたりめくれあがったりしないようにする必要がある。そのため、吸音材を固定するピンや爪が数多く必要となって、吸音材の取付作業が煩雑なものとなる傾向があった。特に、特許文献3に開示されたようなかしめを利用した取付構造は、吸音材の取付工程において、吸音材を配置したのちに、機械的手段や超音波溶着機などによりかしめを行う工程を伴うため、吸音材の取付作業が煩雑となりやすい。
また、ワッシャーなどの皿状部材や板状部材をかしめ部に用いる必要があるので、吸音材が露出する表面積が減ってしまい、消音効果が不十分になることがある。
In order to install the sound absorbing material inside the ventilation path, it is necessary to prevent the sound absorbing material from shifting or turning up due to the air flow so as not to obstruct the flow of air inside the ventilation path. Therefore, a large number of pins and claws for fixing the sound absorbing material are required, and the work of attaching the sound absorbing material tends to be complicated. In particular, the mounting structure using caulking as disclosed in Patent Document 3 involves a step of arranging the sound absorbing material and then caulking it by mechanical means, an ultrasonic welding machine, or the like in the mounting process of the sound absorbing material. Therefore, the installation work of the sound absorbing material tends to be complicated.
Further, since it is necessary to use a dish-shaped member such as a washer or a plate-shaped member for the crimped portion, the surface area where the sound absorbing material is exposed is reduced, and the sound deadening effect may be insufficient.

また、粘着剤や接着剤などを利用して吸音材を取付けようとすれば、特に大型の吸音材を通気経路内部の凹所に沿って取付ける場合などに、吸音材にしわが発生したり、吸音材の取付位置の調整ができなくなったりして、その取付作業が困難となることも多かった。 In addition, if a sound absorbing material is attached using an adhesive or an adhesive, the sound absorbing material may wrinkle or absorb sound, especially when a large sound absorbing material is attached along a recess inside the ventilation path. In many cases, it became impossible to adjust the mounting position of the material, which made the mounting work difficult.

したがって、本発明の目的は、従来公知の吸音材固定構造とは別の固定構造を用いて、吸音材の取付状態を適切に維持可能でありながら、吸音材の取付作業が簡単な、吸音材取付構造を提供することにある。
Therefore, an object of the present invention is to use a fixing structure different from the conventionally known sound absorbing material fixing structure, so that the sound absorbing material can be appropriately maintained in a mounting state, and the sound absorbing material can be easily mounted. To provide a mounting structure.

発明者らは、吸音材として樹脂発泡材(例えばウレタンスポンジ)からなる略平板状の弾力性を有する吸音材を、通気経路を構成する部材に係止固定する検討を行い、検討の中で、図9にその概略を示すように、スポンジ吸音材4の周縁部を、通気経路構成部材9に一体成形された爪部材91で係止して吸音材を固定する吸音材固定構造の検討を行った。この吸音材取付構造によれば、吸音材の弾力性を利用して爪部材91に吸音材周縁部を引っ掛けるだけで取付が完了し、吸音材の取付が簡単となる。 The inventors have studied to lock and fix a substantially flat plate-shaped elastic sound absorbing material made of a resin foam material (for example, urethane sponge) as a sound absorbing material to a member constituting a ventilation path. As the outline of FIG. 9 shows, a study of a sound absorbing material fixing structure in which the peripheral edge portion of the sponge sound absorbing material 4 is locked by a claw member 91 integrally molded with the ventilation path constituent member 9 to fix the sound absorbing material. It was. According to this sound absorbing material mounting structure, the mounting is completed only by hooking the peripheral portion of the sound absorbing material on the claw member 91 by utilizing the elasticity of the sound absorbing material, and the mounting of the sound absorbing material becomes easy.

しかしながら、更なる検討を行う中で、図9のような吸音材取付構造を気流に直接さらされる部位に適用すると、気流の流速によっては、爪部材91による係止が外れて、吸音材がはがれるおそれがある事がわかった。そして、発明者らは、吸音材が外れる原因が、吸音材取付面に対し垂直な方向(面直方向)の係止強度が不足していることにあるのではなく、爪部材の近くで、気流等により吸音材が吸音材取付面に対し水平方向(面内方向)にずれて、爪部材の係止が不十分となることにあることをつきとめた。 However, as a result of further studies, when the sound absorbing material mounting structure as shown in FIG. 9 is applied to a portion directly exposed to the air flow, the locking by the claw member 91 is released depending on the flow velocity of the air flow, and the sound absorbing material is peeled off. It turned out that there was a risk. Then, the inventors have found that the cause of the sound absorbing material coming off is not that the locking strength in the direction perpendicular to the sound absorbing material mounting surface (horizontal direction) is insufficient, but that the sound absorbing material is near the claw member. It was found that the sound absorbing material is displaced in the horizontal direction (in-plane direction) with respect to the sound absorbing material mounting surface due to air flow or the like, resulting in insufficient locking of the claw member.

そして、発明者らは、吸音材周縁部に切欠きを設ける一方で、切欠きに合致する形状の突起部材を通気経路の構成部材に設けて、吸音材の面内方向の動きを規制すれば、吸音材取付の確実性を高められることを知見して本発明を完成させた。 Then, the inventors may provide a notch on the peripheral edge of the sound absorbing material, and provide a protruding member having a shape matching the notch on the constituent member of the ventilation path to regulate the movement of the sound absorbing material in the in-plane direction. The present invention has been completed by finding that the certainty of mounting the sound absorbing material can be improved.

本発明は、通気経路の一部を構成する部材の内周面に設けられた取付領域に、樹脂発泡材からなる平板状の吸音材を取付けた吸音材取付構造であって、吸音材は、通気経路の側から見て矩形状であると共に、吸音材の周縁のコーナー部に設けられた係止爪が吸音材周縁に係止して、吸音材を取付領域面直方向に保持しており、吸音材周縁の辺の部分において、吸音材には、吸音材の内側に向かって切欠きが設けられており、通気経路の一部を構成する部材には、吸音材の切欠きに合致する形状に突起部材が設けられており、突起部材が吸音材の切欠きに当接して、吸音材の辺に沿う方向の相対的な動きを規制する、吸音材取付構造である(第1発明)。 The present invention has a sound absorbing material mounting structure in which a flat plate-shaped sound absorbing material made of a resin foam material is mounted on a mounting region provided on an inner peripheral surface of a member forming a part of a ventilation path. It has a rectangular shape when viewed from the ventilation path side, and the locking claws provided at the corners of the peripheral edge of the sound absorbing material are locked to the peripheral edge of the sound absorbing material to hold the sound absorbing material in the direction perpendicular to the mounting area surface. In the peripheral portion of the sound absorbing material, the sound absorbing material is provided with a notch toward the inside of the sound absorbing material, and the member forming a part of the ventilation path matches the notch of the sound absorbing material. It is a sound absorbing material mounting structure in which a protruding member is provided in the shape, and the protruding member abuts on the notch of the sound absorbing material to regulate the relative movement in the direction along the side of the sound absorbing material (first invention). ..

第1発明において、好ましくは、切欠き及び突起部材が、通気経路の流れの方向に沿って延在する吸音材周縁の辺に設けられる(第2発明)。さらに、第1発明もしくは第2発明において、好ましくは、突起部材の吸音材厚み方向の高さが、吸音材の厚みよりも高くされる(第3発明)。さらに、第1発明ないし第3発明において、好ましくは、突起部材が直方体状である(第4発明)。 In the first invention, preferably, the notch and the protrusion member are provided on the side of the peripheral edge of the sound absorbing material extending along the flow direction of the ventilation path (second invention). Further, in the first invention or the second invention, preferably, the height of the protrusion member in the thickness direction of the sound absorbing material is made higher than the thickness of the sound absorbing material (third invention). Further, in the first to third inventions, the protruding member is preferably a rectangular parallelepiped (fourth invention).

本発明の吸音材取付構造(第1発明)によれば、吸音材の弾力性を利用して係止爪に吸音材を引っ掛けるようにして吸音材が固定でき、吸音材の取付作業が簡単である。
そして、気流が吹付けても、係止爪から吸音材周縁部が引き出されるのを突起部材が阻止して、係止爪による保持力を維持できるので、通気環境におかれた吸音材の取付状態を適切に維持できる。
According to the sound absorbing material mounting structure (first invention) of the present invention, the sound absorbing material can be fixed by hooking the sound absorbing material on the locking claw by utilizing the elasticity of the sound absorbing material, and the mounting work of the sound absorbing material is easy. is there.
Then, even if the airflow is blown, the protrusion member prevents the peripheral portion of the sound absorbing material from being pulled out from the locking claw, and the holding force of the locking claw can be maintained. Therefore, the sound absorbing material placed in the ventilation environment can be attached. The state can be maintained properly.

さらに、第2発明や第3発明のようにされた場合には、吸音材の取付状態がより確実に維持される。また、第4発明のようにされた場合には、吸音材の組み付け方向を間違わずに確実に吸音材の取り付けが行われる。
Further, in the case of the second invention and the third invention, the attached state of the sound absorbing material is more reliably maintained. Further, in the case of the fourth invention, the sound absorbing material is surely attached without making a mistake in the assembling direction of the sound absorbing material.

第1実施形態の吸音材取付構造が適用された吸音ダクトの分解斜視図である。It is an exploded perspective view of the sound absorbing duct to which the sound absorbing material mounting structure of 1st Embodiment is applied. 第1実施形態におけるロワケースと吸音材の形状を示す斜視図である。It is a perspective view which shows the shape of the lower case and the sound absorbing material in 1st Embodiment. 第1実施形態における吸音材とロワケースのX−X断面図である。It is XX sectional view of the sound absorbing material and the lower case in 1st Embodiment. 第1実施形態における吸音材とロワケースのY−Y断面図である。It is YY sectional view of the sound absorbing material and the lower case in 1st Embodiment. 第1実施形態における吸音材とロワケースを取付領域の面直方向から見た図である。It is the figure which looked at the sound absorbing material and the lower case in 1st Embodiment from the plane direction of the mounting area. 第1実施形態における係止爪の他の形状例を示す図である。It is a figure which shows the other shape example of the locking claw in 1st Embodiment. 係止爪と突起部材の配置の他の実施形態を示す図である。It is a figure which shows the other embodiment of the arrangement of a locking claw and a protrusion member. 係止爪と突起部材の配置の他の実施形態を示す図である。It is a figure which shows the other embodiment of the arrangement of a locking claw and a protrusion member. 従来技術による吸音材取付構造の例を示す図である。It is a figure which shows the example of the sound absorbing material mounting structure by a prior art. 従来技術において吸音材が変形して外れやすくなった状況を示す図である。It is a figure which shows the situation which the sound absorbing material is deformed and is easy to come off in the prior art.

以下図面を参照しながら、本発明の第1の実施形態について説明する。なお本発明は以下に示す個別の実施形態に限定されるものではなく、その形態を変更して実施することもできる。図1ないし図5には、ハイブリッド自動車の二次電池を空冷するための冷却風の送風に使用される送風ダクトに本発明の吸音材取付構造を適用した吸音ダクトの例を示す。
図1には、吸音ダクトの全体構成を分解斜視図で示し、図2には、ダクトロワケース単体と吸音材の斜視図を示している。そして、図3は、吸音材が配設された部分の、ダクトの軸方向に沿った平面における断面図(X−X断面図)、図4は、吸音材が配設された部分の、ダクトの軸方向と直交する平面における断面図(Y−Y断面図)である。図5は、ロワケースと吸音材を吸音材取付面の面直方向から見た図である。
The first embodiment of the present invention will be described below with reference to the drawings. The present invention is not limited to the individual embodiments shown below, and the embodiments can be modified and implemented. 1 to 5 show an example of a sound absorbing duct to which the sound absorbing material mounting structure of the present invention is applied to a blowing duct used for blowing cooling air for air-cooling a secondary battery of a hybrid vehicle.
FIG. 1 shows an exploded perspective view of the entire configuration of the sound absorbing duct, and FIG. 2 shows a perspective view of the duct lower case alone and the sound absorbing material. FIG. 3 is a cross-sectional view (XX cross-sectional view) of the portion where the sound absorbing material is arranged in a plane along the axial direction of the duct, and FIG. 4 is a duct of the portion where the sound absorbing material is arranged. It is sectional drawing (YY sectional view) in the plane orthogonal to the axial direction of. FIG. 5 is a view of the lower case and the sound absorbing material as viewed from the direction perpendicular to the surface of the sound absorbing material mounting surface.

吸音ダクト1はダクト経路に沿って半割れ状にされたアッパケース2とロワケース3という2つのケース部材が一体に組み立てられて構成され、その内部空間が中空の冷却風通気経路とされている。図1には、アッパケース2とロワケース3とが一体化される前の状態の分解図として示している。上記二次電池空冷システムにおいて、吸音ダクト1は、その前後に空気取り入れ口や送風ファン、バッテリーケースや他のダクト部材などが接続されて、一連の通気経路の一部として使用される。 The sound absorbing duct 1 is configured by integrally assembling two case members, an upper case 2 and a lower case 3, which are half-split along the duct path, and the internal space thereof is a hollow cooling air ventilation path. FIG. 1 shows an exploded view of the state before the upper case 2 and the lower case 3 are integrated. In the secondary battery air cooling system, the sound absorbing duct 1 is used as a part of a series of ventilation paths by connecting an air intake port, a blower fan, a battery case, and other duct members before and after the sound absorbing duct 1.

アッパケース2やロワケース3は、熱可塑性合成樹脂(本実施形態ではポリプロピレン樹脂)の射出成形などにより成形された樹脂成形品であって、互いの側縁部同士を、接着、溶着あるいは係合などの手段によって結合して、吸音ダクト1が形成される。本実施形態においては、アッパケース2およびロワケース3は、共に断面略Uの字の樋状に形成されている。本実施形態においては、アッパケース2もロワケース3も互いにほぼ対称な形状に形成され、ともに、その内部に吸音材4が取付けられているので、以下の説明では、ロワケースへの吸音材の取付構造を中心に説明する。 The upper case 2 and the lower case 3 are resin molded products formed by injection molding of a thermoplastic synthetic resin (polypropylene resin in the present embodiment), and the side edges of each other are bonded, welded, or engaged with each other. The sound absorbing duct 1 is formed by combining by the means of. In the present embodiment, both the upper case 2 and the lower case 3 are formed in the shape of a gutter having a substantially U-shaped cross section. In the present embodiment, both the upper case 2 and the lower case 3 are formed in a shape substantially symmetrical to each other, and the sound absorbing material 4 is attached to the inside thereof. Therefore, in the following description, the structure for attaching the sound absorbing material to the lower case Will be mainly explained.

図2に示すように、ロワケース3はその両端部30および全体がダクトの通気経路を画成する樋状の形状に形成されると共に、ロワケース3のダクト中央部には、その周壁(下面側の周壁)がダクト下側に向かって張り出すように設けられた膨出部31が形成されている。そして、膨出部31の内側に吸音材4が取付けられる。即ち、本実施形態においては、膨出部31のダクト下側の内周面31aが、吸音材4が取付けられるべき取付領域Sとされている。 As shown in FIG. 2, the lower case 3 is formed in a gutter-like shape in which both end portions 30 and the entire portion define the ventilation path of the duct, and the peripheral wall (on the lower surface side) is formed in the central portion of the duct of the lower case 3. A bulging portion 31 is formed so that the peripheral wall) projects toward the lower side of the duct. Then, the sound absorbing material 4 is attached to the inside of the bulging portion 31. That is, in the present embodiment, the inner peripheral surface 31a on the lower side of the duct of the bulging portion 31 is the mounting region S to which the sound absorbing material 4 should be mounted.

吸音材4が取付けられる部分について詳述する。本実施形態においては、吸音材4が取付けられるべき取付領域Sは、膨出部31の下側の内周面31aであり、膨出部の底面に相当し、略平板状の取付面とされている。そして、取付領域Sは、矩形状の形状になっている。膨出部31の深さ(ダクト端部30と比べたダクト下側への張り出し量)は、吸音材4と同じ程度の寸法とされており、吸音材4が取り付けられた状態で、ロワケース両端部30の内周面と吸音材4の表面とがほぼ平滑に接続されるようになっている。 The portion to which the sound absorbing material 4 is attached will be described in detail. In the present embodiment, the mounting area S to which the sound absorbing material 4 should be mounted is the inner peripheral surface 31a on the lower side of the bulging portion 31, which corresponds to the bottom surface of the bulging portion and is a substantially flat mounting surface. ing. The mounting area S has a rectangular shape. The depth of the bulging portion 31 (the amount of protrusion to the lower side of the duct as compared with the duct end portion 30) has the same dimensions as the sound absorbing material 4, and both ends of the lower case with the sound absorbing material 4 attached. The inner peripheral surface of the portion 30 and the surface of the sound absorbing material 4 are connected substantially smoothly.

取付領域Sに取付けられる吸音材4は、樹脂発泡材(発泡ウレタンスポンジなど)などからなる、弾力性を有する吸音材であり、無負荷状態で略平板状となるように形成されている。吸音材4は、取付領域Sにほぼ合致する形状で平板状に形成されて、吸音材4によって膨出部31が埋められるように、取付領域Sに取り付けられている。すなわち、吸音材4は、通気経路の側から見て、矩形状である。 The sound absorbing material 4 attached to the mounting region S is an elastic sound absorbing material made of a resin foam material (foamed urethane sponge or the like), and is formed so as to have a substantially flat plate shape in a no-load state. The sound absorbing material 4 is formed in a flat plate shape with a shape substantially matching the mounting area S, and is attached to the mounting area S so that the bulging portion 31 is filled with the sound absorbing material 4. That is, the sound absorbing material 4 has a rectangular shape when viewed from the side of the ventilation path.

吸音材4の固定は、以下のように行われている。
ロワケース3の膨出部31の周縁のコーナー部、すなわち、取付領域Sの周縁部のコーナー部に、係止爪32、32が設けられている。本実施形態においては、係止爪32、32は、矩形状の取付領域Sのコーナー部の他に、矩形状の取付領域Sがケース両端部30に面する側の辺のほぼ中央にも、係止爪32、32が配置されている。これら係止爪32は、ケース両端部30の底面をダクト軸方向に沿って延長するように、吸音材周縁から吸音材の内側に向かう方向に、取付面31aとほぼ平行に延在する形状で設けられており、係止爪32と取付面31aの間の空間に吸音材4の周縁部が配置されて、吸音材4が係止爪32と取付面31aの間に挟持されるように係止されることによって、係止爪32により、吸音材4の周縁部が取付領域Sに対して面直方向に保持される。係止爪32と取付面31aとによる吸音材4の挟持は、吸音材が両者の間でやや圧縮気味となるようにすることが、吸音材の保持を確実なものとする上で好ましい。挟持の程度は吸音材が係止爪により取付面面直方向への移動を制止可能な程度であっても良く、必ずしも吸音材が圧縮される必要はない。吸音材4と係止爪32の間に隙間があっても良い。
The sound absorbing material 4 is fixed as follows.
Locking claws 32 and 32 are provided at the corners of the peripheral edge of the bulging portion 31 of the lower case 3, that is, at the corners of the peripheral edge of the mounting area S. In the present embodiment, the locking claws 32, 32 are provided not only at the corners of the rectangular mounting area S, but also at substantially the center of the side of the rectangular mounting area S facing both ends 30 of the case. Locking claws 32, 32 are arranged. These locking claws 32 have a shape extending substantially parallel to the mounting surface 31a in the direction from the peripheral edge of the sound absorbing material toward the inside of the sound absorbing material so that the bottom surfaces of both ends 30 of the case extend along the duct axis direction. The peripheral portion of the sound absorbing material 4 is arranged in the space between the locking claw 32 and the mounting surface 31a so that the sound absorbing material 4 is sandwiched between the locking claw 32 and the mounting surface 31a. By being stopped, the peripheral portion of the sound absorbing material 4 is held in the direction perpendicular to the mounting area S by the locking claw 32. It is preferable that the sound absorbing material 4 is sandwiched between the locking claw 32 and the mounting surface 31a so that the sound absorbing material is slightly compressed between the two in order to ensure the holding of the sound absorbing material. The degree of pinching may be such that the sound absorbing material can be prevented from moving in the direction perpendicular to the mounting surface by the locking claws, and the sound absorbing material does not necessarily have to be compressed. There may be a gap between the sound absorbing material 4 and the locking claw 32.

また、矩形状の吸音材4の周縁の辺の部分において、吸音材4には、吸音材の内側に向かって切欠き41が設けられている。本実施形態においては、切欠き41は、通気経路の流れの方向に沿って延在する吸音材周縁の辺の中央部に設けられている。一方、本実施形態では、矩形状の取付領域Sがケース両端部30に面する側の辺では、吸音材4に切欠きは設けられていない。 Further, in the portion of the peripheral edge of the rectangular sound absorbing material 4, the sound absorbing material 4 is provided with a notch 41 toward the inside of the sound absorbing material. In the present embodiment, the notch 41 is provided in the central portion of the peripheral edge of the sound absorbing material extending along the flow direction of the ventilation path. On the other hand, in the present embodiment, the sound absorbing material 4 is not provided with a notch on the side where the rectangular mounting region S faces both end portions 30 of the case.

切欠き41は、通気経路の側から見て、即ち、取付領域Sの法線方向に沿って見て、吸音材4の周縁から内側に向かうように、設けられている。本実施形態においては、切欠き41は、四角形(直方体)状に設けられている。切欠きは吸音材4の周縁から内側に向かう線状であってもよい。また、本実施形態のように、切欠き41により、切欠きが設けられた辺に直交する面が設けられることが好ましい。 The notch 41 is provided so as to face inward from the peripheral edge of the sound absorbing material 4 when viewed from the side of the ventilation path, that is, when viewed along the normal direction of the mounting region S. In the present embodiment, the notch 41 is provided in a quadrangular shape (rectangular parallelepiped). The notch may be linear from the peripheral edge of the sound absorbing material 4 toward the inside. Further, as in the present embodiment, it is preferable that the notch 41 provides a surface orthogonal to the side on which the notch is provided.

さらに、ロワケース3には、吸音材4の切欠き41に合致する形状に突起部材33が設けられており、突起部材33が吸音材41の切欠きに当接して、吸音材の辺に沿う方向の相対的な動きを規制する。即ち、本実施形態では、直方体状の突起部材33,33が、切欠き41,41に対応する位置及び形状で設けられている。 Further, the lower case 3 is provided with a protrusion member 33 having a shape that matches the notch 41 of the sound absorbing material 4, and the protrusion member 33 comes into contact with the notch of the sound absorbing material 41 in a direction along the side of the sound absorbing material. Regulate the relative movement of. That is, in the present embodiment, the rectangular parallelepiped protruding members 33, 33 are provided at positions and shapes corresponding to the notches 41, 41.

突起部材33は、吸音材4の切欠き41と軽く接触しているだけであってもよく、吸音材の取付領域面直方向については、実質的に吸音材を保持する力を発揮しなくてもよい。突起部材33と吸音材の切欠き部分との当接や、辺に沿う動きの規制が確実になされるように、吸音材4の切欠き41の部分により、突起部材33が軽く挟み込まれることが好ましい。 The protrusion member 33 may only be in light contact with the notch 41 of the sound absorbing material 4, and does not substantially exert a force for holding the sound absorbing material in the direction perpendicular to the mounting area surface of the sound absorbing material. May be good. The protrusion member 33 may be lightly sandwiched by the notch 41 of the sound absorbing material 4 so that the protrusion member 33 and the notch portion of the sound absorbing material come into contact with each other and the movement along the side is regulated. preferable.

本実施形態のように、吸音材4の切欠き41や、突起部材33は、通気経路の流れの方向に沿って延在する吸音材周縁の辺に設けられることが好ましい。また、本実施形態のように、突起部材33の吸音材厚み方向の高さが、吸音材の厚みよりも高くされることが好ましい。 As in the present embodiment, the notch 41 of the sound absorbing material 4 and the protrusion member 33 are preferably provided on the side of the peripheral edge of the sound absorbing material extending along the flow direction of the ventilation path. Further, as in the present embodiment, it is preferable that the height of the protrusion member 33 in the thickness direction of the sound absorbing material is higher than the thickness of the sound absorbing material.

ロワケース3への吸音材4の取付け作業は、吸音材の弾力性を利用して行うことができる。すなわち、射出成形などの手段によって形成されたロワケース3及び係止爪32,32、突起部材33,33に対して、所定の形状及び寸法に形成された吸音材4を、膨出部31の内部即ち取付領域S上に配置し、吸音材を弾性変形させながら、吸音材4の切欠き41,41に突起部材33,33を合致させながら、吸音材4のコーナー部を係止爪32,32の下側に押し込んで引っ掛けるようにして係止させることにより、吸音材4の取付が完了する。必要があれば、他の部位に設けられた係止爪部材やピン部材、粘着テープなどといった他の取付部材を併用することも可能である。吸音材が大型である場合には特に、吸音材の中央部にこれら他の取付部材を設けることが好ましい。 The work of attaching the sound absorbing material 4 to the lower case 3 can be performed by utilizing the elasticity of the sound absorbing material. That is, the sound absorbing material 4 formed in a predetermined shape and size is provided inside the bulging portion 31 with respect to the lower case 3, the locking claws 32, 32, and the protruding members 33, 33 formed by means such as injection molding. That is, the corners of the sound absorbing material 4 are locked by the locking claws 32, 32 while being arranged on the mounting area S and elastically deforming the sound absorbing material and matching the protrusions 33, 33 with the notches 41, 41 of the sound absorbing material 4. The installation of the sound absorbing material 4 is completed by pushing it to the lower side and locking it so as to be hooked. If necessary, other mounting members such as locking claw members, pin members, and adhesive tapes provided in other parts can be used in combination. Especially when the sound absorbing material is large, it is preferable to provide these other mounting members in the central portion of the sound absorbing material.

吸音材の取付けが完了すると、吸音材4の弾力性による復元力によって、吸音材4は膨出部31を埋めるような形状に戻り、吸音材のコーナー部が係止爪32,32によって取付領域面直方向に保持されると共に、突起部材33,33と切欠き41,41の当接によって吸音材の取付領域面内方向の動きが規制されて、吸音材4がロワケース膨出部31内部に取付けられ、固定される。 When the installation of the sound absorbing material is completed, the sound absorbing material 4 returns to a shape that fills the bulging portion 31 due to the restoring force due to the elasticity of the sound absorbing material 4, and the corner portion of the sound absorbing material is connected to the mounting area by the locking claws 32 and 32. While being held in the direction perpendicular to the surface, the inward movement of the sound absorbing material mounting area is restricted by the contact between the protrusions 33, 33 and the notches 41, 41, and the sound absorbing material 4 is inside the lower case bulging portion 31. Installed and fixed.

吸音材4を構成する樹脂発泡材としては、例えば、連続気泡構造を有するポリウレタン系発泡材が使用できる。その他の好ましい吸音材としては、ポリオレフィン系発泡材(ポリエチレン発泡材、発泡エチレン−酢酸ビニル共重合体など)、ポリ塩化ビニル系発泡材などの合成樹脂発泡材が例示できる。 As the resin foaming material constituting the sound absorbing material 4, for example, a polyurethane-based foaming material having an open cell structure can be used. Examples of other preferable sound absorbing materials include synthetic resin foaming materials such as polyolefin foaming materials (polyethylene foaming materials, foamed ethylene-vinyl acetate copolymers, etc.) and polyvinyl chloride foaming materials.

樹脂発泡材の気泡構造は、独立気泡構造、連続気泡構造、両者を組み合わせた構造のいずれであってもよいが、吸音性を向上できる点から、少なくとも連続気泡を含む構造が好ましい。また、製造された樹脂発泡材の表面にスキン層がある場合には、スキン層を除去して使用することが好ましい。連続気泡の割合は、全気泡中60〜100%(例えば、65〜99.9%)、好ましくは70〜99%程度である。 The cell structure of the resin foaming material may be a closed cell structure, an open cell structure, or a structure in which both are combined, but a structure containing at least open cells is preferable from the viewpoint of improving sound absorption. Further, when there is a skin layer on the surface of the produced resin foam material, it is preferable to remove the skin layer before use. The ratio of open cells is 60 to 100% (for example, 65 to 99.9%), preferably about 70 to 99% of all cells.

また、吸音材の密度は、10〜100kg/m3程度の範囲から選択でき、例えば、消音性を向上するためには、15〜70kg/m3、好ましくは18〜48kg/m3、さらに好ましくは20〜46kg/m3程度である。吸音材の通気度(JIS K6400−7 A法に準拠した方法)は0.05〜5dm3/秒程度の範囲から選択でき、例えば、消音性が向上するためには、0.07〜2dm3/秒、好ましくは0.1〜1.4dm3/秒、さらに好ましくは0.2〜1.3dm3/秒(特に0.3〜1.2dm3/秒)程度であってもよい。 The density of the sound absorbing material can be selected from the range of about 10 to 100 kg / m3. For example, in order to improve the sound deadening property, it is 15 to 70 kg / m3, preferably 18 to 48 kg / m3, and more preferably 20 to 20 to. It is about 46 kg / m3. The air permeability of the sound absorbing material (method based on JIS K6400-7 A method) can be selected from the range of about 0.05 to 5 dm3 / sec. For example, in order to improve the sound deadening property, 0.07 to 2 dm3 / sec. It may be about 0.1 to 1.4 dm3 / sec, more preferably 0.2 to 1.3 dm3 / sec (particularly 0.3 to 1.2 dm3 / sec).

吸音材の弾力性の程度は以下のとおりである。なお、弾力性の程度は、JIS K6400に準拠する硬さ測定試験による値で示し、具体的には、大きさ380mm×380mm厚み50mmの試験片を、5N荷重時の厚みを元厚として、75%圧縮後、再度、元厚の25%まで圧縮し、20秒後の荷重(N)を測定することにより行う。本発明に使用する吸音材として好ましい弾力性の程度は、上記硬さで、30〜500Nであり、好ましくは50〜350Nであり、より好ましくは70〜260Nである。硬さが小さすぎれば吸音材の保持力が不足しがちになり、硬さが大きすぎれば吸音材4をロワケースの膨出部31に収容し、係止爪32により固定する作業が難しくなる。 The degree of elasticity of the sound absorbing material is as follows. The degree of elasticity is indicated by a value measured by a hardness measurement test based on JIS K6400. Specifically, a test piece having a size of 380 mm × 380 mm and a thickness of 50 mm is 75 with the thickness under 5N load as the base thickness. After% compression, it is compressed again to 25% of the original thickness, and the load (N) after 20 seconds is measured. The degree of elasticity preferable for the sound absorbing material used in the present invention is 30 to 500 N, preferably 50 to 350 N, and more preferably 70 to 260 N in terms of the hardness. If the hardness is too small, the holding power of the sound absorbing material tends to be insufficient, and if the hardness is too large, the sound absorbing material 4 is accommodated in the bulging portion 31 of the lower case, and it becomes difficult to fix the sound absorbing material by the locking claws 32.

吸音材の厚みや大きさは、消音性能とレイアウトスペースの関係で決定すればよいが、代表的な実施形態における吸音材の好ましい厚みtは3mm〜100mm、より好ましくは、5mm〜30mm程度であり、長さや幅は、好ましくは30〜500mm、より好ましくは50〜300mm程度である。 The thickness and size of the sound absorbing material may be determined in relation to the sound deadening performance and the layout space, but the preferable thickness t of the sound absorbing material in the typical embodiment is about 3 mm to 100 mm, more preferably about 5 mm to 30 mm. The length and width are preferably about 30 to 500 mm, more preferably about 50 to 300 mm.

本発明の上記実施形態が有する作用効果について説明する。
上記実施形態によれば、取付領域Sの面直方向に吸音材4を保持する係止爪32と、辺に沿う方向への吸音材4の動きを規制する突起部材33とを、組み合わせて用いることにより、取付領域に対して、吸音材4を簡単に取付固定できる。即ち、粘着剤や接着剤を用いる箇所を減らしても、吸音材の弾力性を利用して、吸音材の取付作業を行うことができ、その作業が簡単である。そして、取付作業が煩雑となる原因であった、接着剤や粘着材の使用や、ピン部材のかしめ工程が必要になる箇所を減らすことができ、吸音材取付工程の工程簡易化に効果的である。
The action and effect of the above-described embodiment of the present invention will be described.
According to the above embodiment, the locking claw 32 that holds the sound absorbing material 4 in the direction perpendicular to the surface of the mounting region S and the protrusion member 33 that regulates the movement of the sound absorbing material 4 in the direction along the side are used in combination. As a result, the sound absorbing material 4 can be easily mounted and fixed to the mounting area. That is, even if the number of places where the adhesive or the adhesive is used is reduced, the sound absorbing material can be attached by utilizing the elasticity of the sound absorbing material, and the work is easy. It is also possible to reduce the number of places where the use of adhesives and adhesives and the caulking process of pin members, which caused the installation work to become complicated, can be reduced, which is effective in simplifying the process of installing the sound absorbing material. is there.

特に、吸音材4の切欠き41と突起部材33を当接させる取付作業は、切欠き41が吸音材の周縁に設けられているため、簡単である。特許文献3にあるような取付構造では、ピンを吸音材に設けられた穴に貫通させるといった煩わしい作業が必要なるが、上記実施形態の取付構造によれば、吸音材を圧縮しながら所定の位置に押し込めば、吸音材が元の形状に回復する際に、自然に切欠き41と突起部材33が合致して当接するようになるため、吸音材取付作業は、特に簡単なものとなる。 In particular, the mounting work of bringing the notch 41 of the sound absorbing material 4 into contact with the protrusion 33 is easy because the notch 41 is provided on the peripheral edge of the sound absorbing material. In the mounting structure as described in Patent Document 3, troublesome work such as penetrating a pin through a hole provided in the sound absorbing material is required, but according to the mounting structure of the above embodiment, the sound absorbing material is compressed and placed in a predetermined position. When the sound absorbing material is pushed into the original shape, the notch 41 and the protruding member 33 naturally come into contact with each other when the sound absorbing material is restored to its original shape, so that the sound absorbing material mounting work becomes particularly simple.

そして、上記実施形態の取付構造によれば、取付領域Sの面直方向に吸音材4を保持する係止爪32と、取付領域Sの辺に沿う方向への吸音材4の動きを規制する切込み41と突起部材33を、組み合わせて用いて、吸音材周縁部の固定を行うことにより、係止爪32から吸音材周縁部が引き出されるのを突起部材33が阻止して、係止爪32による保持力を維持できるので、通気環境におかれた吸音材の取付状態を適切に維持できる。 Then, according to the mounting structure of the above embodiment, the movement of the locking claw 32 that holds the sound absorbing material 4 in the direction perpendicular to the surface of the mounting region S and the sound absorbing material 4 in the direction along the side of the mounting region S is restricted. By fixing the sound absorbing material peripheral edge portion by using the notch 41 and the protruding member 33 in combination, the protruding member 33 prevents the sound absorbing material peripheral edge portion from being pulled out from the locking claw 32, and the locking claw 32. Since the holding force can be maintained, it is possible to properly maintain the mounting state of the sound absorbing material placed in the ventilation environment.

すなわち、上記実施形態の吸音材取付構造においては、仮に、ダクト内部を流れる気流の影響により、図10のように吸音材が浮き上がり係止爪が外れそうになろうとしても、吸音材周縁に設けられた切欠き41と突起部材33の当接によって、係止爪32から吸音材4の周縁部が引き出されることが未然に防止され、係止爪32の係止が不十分となることが未然防止される。従って、ダクト内部の気流の影響を受けにくくなり、係止爪による吸音材の取付状態を確実に維持できる。 That is, in the sound absorbing material mounting structure of the above embodiment, even if the sound absorbing material is lifted as shown in FIG. 10 due to the influence of the air flow flowing inside the duct and the locking claw is about to come off, the sound absorbing material is provided on the periphery of the sound absorbing material. The contact between the notch 41 and the protrusion 33 prevents the peripheral edge of the sound absorbing material 4 from being pulled out from the locking claw 32, and the locking claw 32 is not sufficiently locked. Be prevented. Therefore, it is less likely to be affected by the air flow inside the duct, and the state in which the sound absorbing material is attached by the locking claw can be reliably maintained.

吸音材4の取付けをより確実なものにするとの観点からは、切欠き41及び突起部材33が、通気経路の流れの方向に沿って延在する吸音材周縁の辺に設けられることが好ましい。このようにされていると、切欠き41と突起部材33の当接により、吸音材4が気流の下流方向に移動することが、より確実に抑制され、上流側に設けられた係止爪32から吸音材のコーナー部が抜け出てしまうことが防止される。 From the viewpoint of making the attachment of the sound absorbing material 4 more reliable, it is preferable that the notch 41 and the protrusion 33 are provided on the side of the peripheral edge of the sound absorbing material extending along the flow direction of the ventilation path. In this way, the contact between the notch 41 and the protrusion 33 prevents the sound absorbing material 4 from moving in the downstream direction of the air flow more reliably, and the locking claw 32 provided on the upstream side is prevented. It is prevented that the corner portion of the sound absorbing material comes out from the sound absorbing material.

また、同様の観点から、突起部材33の吸音材厚み方向の高さが、吸音材4の厚みよりも高くされることが好ましい。このようにされていると、吸音材4が気流によりやや浮き上がりつつある状態においてもなお、突起部材33と切欠き41の当接が維持され、吸音材4の下流側への移動や、係止爪32からの吸音材コーナー部の離脱を、より確実に抑制できるからである。 From the same viewpoint, it is preferable that the height of the protrusion member 33 in the thickness direction of the sound absorbing material is higher than the thickness of the sound absorbing material 4. In this way, even when the sound absorbing material 4 is slightly lifted by the air flow, the contact between the protrusion member 33 and the notch 41 is maintained, and the sound absorbing material 4 is moved to the downstream side or locked. This is because the detachment of the sound absorbing material corner portion from the claw 32 can be more reliably suppressed.

また、係止爪32による吸音材の係止効果をより確実なものとするためには、係止爪32が吸音材表面と接触する部分に、突起、突起列、凸条、鋸歯状突起、返し形状等のような、吸音材4と係止爪32とのずれを防止する形状を追加して設けることが好ましく、そのような係止爪形状の例を図6に示す。図6には、係止爪部分のみを拡大して示しており、ロワケース部材はカットした一部分のみを示している。 Further, in order to make the locking effect of the sound absorbing material by the locking claw 32 more reliable, protrusions, protrusion rows, ridges, serrated protrusions, etc. are formed on the portion where the locking claw 32 contacts the surface of the sound absorbing material. It is preferable to additionally provide a shape for preventing the sound absorbing material 4 and the locking claw 32 from being displaced, such as a barb shape, and an example of such a locking claw shape is shown in FIG. In FIG. 6, only the locking claw portion is enlarged and shown, and the lower case member shows only the cut portion.

図6に示す係止爪の例においては、係止爪本体部32aの下側、即ち、吸音材と直接対向する側の面には、凸条32bが設けられており、凸条32bは、その断面が吸音材の離脱方向への移動を阻止するような返し形状に設けられている。この例の係止爪によれば、吸音材4の係止爪からの離脱がより効果的に防止されて、吸音材の取り付け状態がより確実に維持されるようになる。 In the example of the locking claw shown in FIG. 6, a ridge 32b is provided on the lower side of the locking claw main body 32a, that is, the surface on the side directly facing the sound absorbing material, and the ridge 32b is formed. Its cross section is provided in a barb shape that prevents the sound absorbing material from moving in the detaching direction. According to the locking claw of this example, the sound absorbing material 4 is more effectively prevented from being detached from the locking claw, and the attached state of the sound absorbing material is more reliably maintained.

また、上記実施形態の取付構造のように、突起部材33が直方体状である場合には、吸音材4に設けられる切欠き41が四角形状となり、外観上明瞭な切欠きとなる。すると、吸音材4の向きを間違って組み付けてしまうことが予防されて確実に吸音材が取付けられる。これにより、吸音材組み付けの工程が、より効率的に行われうる。 Further, when the protrusion member 33 has a rectangular parallelepiped shape as in the mounting structure of the above embodiment, the notch 41 provided in the sound absorbing material 4 has a rectangular shape, which is a clear notch in appearance. Then, it is prevented that the sound absorbing material 4 is assembled in the wrong direction, and the sound absorbing material is surely attached. As a result, the process of assembling the sound absorbing material can be performed more efficiently.

発明は、上記実施形態に限定されるものではなく、種々の改変をして実施することができる。以下に発明の他の実施形態について説明するが、以下の説明においては、上記実施形態と異なる部分を中心に説明し、同様である部分についてはその詳細な説明を省略する。また、これら実施形態は、その一部を互いに組み合わせて、あるいは、その一部を置き換えて実施できる。 The invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the invention will be described below, but in the following description, parts different from the above-described embodiments will be mainly described, and detailed description of similar parts will be omitted. Moreover, these embodiments can be carried out by combining some of them with each other or replacing some of them.

吸音材の取付領域の立体的な形状は特に限定されないが、入手性に優れる平板状の吸音材を利用しやすい観点から、取付領域は平板状あるいは、湾曲の程度が少ない曲面状、あるいは折り曲げ面状であることが好ましい。 The three-dimensional shape of the mounting area of the sound absorbing material is not particularly limited, but from the viewpoint that a flat plate-shaped sound absorbing material having excellent availability can be easily used, the mounting area is a flat plate, a curved surface with a small degree of curvature, or a bent surface. It is preferably shaped.

突起部材の具体的形状も、上記実施形態に示した直方体状のものに限定されるものではなく、板状などの突起部材であってもよい。突起部材の表面が平滑にされていると、吸音材取付作業がしやすくなる。逆に、突起部材の表面に返し状の突起を設けるなどすると、吸音材の固定の確実性をより高めることもできる。取付の確実性を高める観点からは、吸音材の切欠きと突起部材とが、吸音材周縁の辺に直交する面で当接するように、両者が設けられることが好ましい。また、取付の確実性を高める観点からは、吸音材4の切欠き41によって突起部材33が軽く挟み込まれる程度に、両者が密着して設けられることが好ましい。 The specific shape of the protruding member is not limited to the rectangular parallelepiped shape shown in the above embodiment, and may be a plate-shaped protruding member. If the surface of the protruding member is smooth, it becomes easier to attach the sound absorbing material. On the contrary, if a barb-shaped protrusion is provided on the surface of the protrusion member, the certainty of fixing the sound absorbing material can be further improved. From the viewpoint of increasing the reliability of mounting, it is preferable that both are provided so that the notch of the sound absorbing material and the protruding member are in contact with each other on a surface orthogonal to the side of the peripheral edge of the sound absorbing material. Further, from the viewpoint of increasing the reliability of mounting, it is preferable that both are provided in close contact with each other so that the protrusion member 33 is lightly sandwiched by the notch 41 of the sound absorbing material 4.

図7、図8には、切欠きや突起部材の配置に関する、他の実施形態を示す。図7、図8には、吸音材4と係止爪32、突起部材33のみを図示している。また、図7や図8では、図の上下方向が、流れの方向である。
切欠き(41)や突起部材33は、図7に示すように、1つの辺に対し複数個所に設けられていてもよい。切欠きや突起部材33が複数個所に設けられていると、係止爪32と突起部材33の間の距離が大きくならないようにできるので、吸音材4の固定がより確実なものとなる。
7 and 8 show other embodiments relating to the arrangement of notches and protrusions. 7 and 8 show only the sound absorbing material 4, the locking claw 32, and the protrusion 33. Further, in FIGS. 7 and 8, the vertical direction in the figure is the flow direction.
As shown in FIG. 7, the notch (41) and the protrusion 33 may be provided at a plurality of positions on one side. If the notches and the protrusions 33 are provided at a plurality of places, the distance between the locking claws 32 and the protrusions 33 can be prevented from increasing, so that the sound absorbing material 4 can be fixed more reliably.

また、図7の例に示すように、係止爪32,32は、吸音材のコーナー部のみに配置されていればよい。すなわち、吸音材周縁の辺の中央部における係止爪32の配置は必須ではない。 Further, as shown in the example of FIG. 7, the locking claws 32, 32 may be arranged only at the corners of the sound absorbing material. That is, the arrangement of the locking claws 32 at the central portion of the peripheral edge of the sound absorbing material is not essential.

また、切欠きや突起部材33は、図8に示すように、流れ方向の上流側や下流側に位置する辺に設けられていてもよい。このようにされていれば、吸音材4のコーナー部が、係止爪32,32から、図の左右方向に抜け出してしまうことが防止され、吸音材4の固定がより確実なものとなる。 Further, as shown in FIG. 8, the notch and the protrusion member 33 may be provided on the side located on the upstream side or the downstream side in the flow direction. If this is done, the corners of the sound absorbing material 4 are prevented from coming off from the locking claws 32 and 32 in the left-right direction in the drawing, and the sound absorbing material 4 is more securely fixed.

また、図8に示す例のように、各辺において、切欠きや突起部材33が設けられる位置は、辺の中央部からオフセットしていてもよい。位置をオフセットさせることによって、吸音材を誤った向きに組み付けてしまうことが抑制される。流れ方向に沿った辺において、切欠きや突起部材33が設けられる位置をオフセットさせる場合には、吸音材の固定をより確実なものとする観点から、図8の例のように、上流側にオフセットさせることがより好ましい。 Further, as in the example shown in FIG. 8, the position where the notch or the protrusion member 33 is provided on each side may be offset from the central portion of the side. By offsetting the position, it is possible to prevent the sound absorbing material from being assembled in the wrong direction. When offsetting the position where the notch or the protrusion 33 is provided on the side along the flow direction, from the viewpoint of making the sound absorbing material more reliable, as shown in the example of FIG. 8, on the upstream side. It is more preferable to offset.

また、樹脂発泡材からなる平板状の吸音材4は、吸音材の全体形状として平らな板状であればよく、その表面が平滑な表面を有するものに限定されず、いわゆるプロファイル加工によって形成されるような、複数の山部や谷部が吸音材の表面に分布するように形成したものでも良いし、複数の凸条や凹条が交互に波状に配置されるように形成した物でも良い。このようなプロファイル加工を施した吸音材は、特に凹凸が存在する面の側がケース部材の取付領域Sと直接対向するように取り付けることが好ましい。そのように取り付けることによって、吸音材4とケース部材との間にいわゆる背後空気層を作ることができるので、吸音性能が向上する。 Further, the flat plate-shaped sound absorbing material 4 made of a resin foaming material may have a flat plate shape as the whole shape of the sound absorbing material, and the surface thereof is not limited to that having a smooth surface, and is formed by so-called profile processing. It may be formed so that a plurality of peaks and valleys are distributed on the surface of the sound absorbing material, or it may be formed so that a plurality of ridges and dents are alternately arranged in a wavy shape. .. It is preferable that the sound absorbing material subjected to such profile processing is mounted so that the side of the surface where the unevenness exists is directly opposed to the mounting region S of the case member. By attaching in this way, a so-called back air layer can be formed between the sound absorbing material 4 and the case member, so that the sound absorbing performance is improved.

また、上述した吸音材取付構造において吸音材が取り付けられる部材は、一連の通気経路の一部を構成する部材であればよく、通気経路の具体的用途や具体的構成部材には特に制限はない。吸音材が取り付けられる部材は、上記実施形態のようにダクト部材であっても良いし、例えば、内燃機関用のエアクリーナのケース部材であっても良く、他のケース部材、例えば空冷式の電池収容ケースの一部をなす部材や、エアコンディショナー用のダクト部材であっても良い。 Further, in the above-mentioned sound absorbing material mounting structure, the member to which the sound absorbing material is attached may be a member that constitutes a part of a series of ventilation paths, and there is no particular limitation on the specific use of the ventilation path and the specific constituent members. .. The member to which the sound absorbing material is attached may be a duct member as in the above embodiment, or may be, for example, a case member of an air cleaner for an internal combustion engine, and another case member, for example, an air-cooled battery accommodating member. It may be a member forming a part of the case or a duct member for an air conditioner.

上記吸音材取付構造によれば、一連の通気経路を構成する部材に対して、簡単な取付作業で確実に吸音材を取り付けることができ、通気経路に消音性を付与することができて、産業上の利用価値が高い。 According to the above-mentioned sound absorbing material mounting structure, the sound absorbing material can be reliably mounted on the members constituting the series of ventilation paths by a simple mounting operation, and the ventilation paths can be provided with sound deadening properties. The above utility value is high.

1 吸音ダクト
2 アッパケース
3 ロワケース
31 膨出部
32 係止爪
33 突起部材
S 吸音材取付領域
31a 取付面
4 吸音材
41 切欠き
1 Sound absorbing duct 2 Upper case 3 Lower case 31 Protruding part 32 Locking claw 33 Protruding member S Sound absorbing material mounting area 31a Mounting surface 4 Sound absorbing material 41 Notch

Claims (4)

通気経路の一部を構成する部材の内周面に設けられた取付領域に、
樹脂発泡材からなる平板状の吸音材を取付けた吸音材取付構造であって、
吸音材は、通気経路の側から見て矩形状であると共に、
吸音材の周縁のコーナー部に設けられた係止爪が吸音材周縁に係止して、吸音材を取付領域面直方向に保持しており、
吸音材周縁の辺の部分において、吸音材には、吸音材の内側に向かって切欠きが設けられており、
通気経路の一部を構成する部材には、吸音材の切欠きに合致する形状に突起部材が設けられており、突起部材が吸音材の切欠きに当接して、吸音材の辺に沿う方向の相対的な動きを規制する、
吸音材取付構造。
In the mounting area provided on the inner peripheral surface of the members that form part of the ventilation path,
It is a sound absorbing material mounting structure to which a flat plate-shaped sound absorbing material made of a resin foam material is mounted.
The sound absorbing material has a rectangular shape when viewed from the side of the ventilation path, and also has a rectangular shape.
Locking claws provided at the corners of the peripheral edge of the sound absorbing material are locked to the peripheral edge of the sound absorbing material to hold the sound absorbing material in the direction perpendicular to the mounting area surface.
At the peripheral portion of the sound absorbing material, the sound absorbing material is provided with a notch toward the inside of the sound absorbing material.
The member forming a part of the ventilation path is provided with a protruding member in a shape that matches the notch of the sound absorbing material, and the protruding member abuts on the notch of the sound absorbing material in the direction along the side of the sound absorbing material. Regulate the relative movement of
Sound absorbing material mounting structure.
切欠き及び突起部材が、通気経路の流れの方向に沿って延在する吸音材周縁の辺に設けられた
請求項1に記載の吸音材取付構造。
The sound absorbing material mounting structure according to claim 1, wherein the notch and the protruding member are provided on the side of the peripheral edge of the sound absorbing material extending along the flow direction of the ventilation path.
突起部材の吸音材厚み方向の高さが、吸音材の厚みよりも高くされた
請求項1または請求項2に記載の吸音材取付構造。
The sound absorbing material mounting structure according to claim 1 or 2, wherein the height of the protrusion member in the thickness direction of the sound absorbing material is higher than the thickness of the sound absorbing material.
突起部材が直方体状である請求項1ないし請求項3のいずれかに記載の吸音材取付構造。 The sound absorbing material mounting structure according to any one of claims 1 to 3, wherein the protruding member has a rectangular parallelepiped shape.
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