JP2005263119A

JP2005263119A - Hood insulator

Info

Publication number: JP2005263119A
Application number: JP2004081264A
Authority: JP
Inventors: Takakuni Hirayama; 貴邦平山; Shinobu Fushiki; 忍伏木; Shuichi Mizata; 修一見座田
Original assignee: Honda Motor Co Ltd; Howa Textile Industry Co Ltd
Current assignee: Honda Motor Co Ltd; Howa Co Ltd
Priority date: 2004-03-19
Filing date: 2004-03-19
Publication date: 2005-09-29

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hood insulator without sagging due to a gravity for a long time even if the number of fixing points on a rear side of the hood is small, capable of improving rigidity without deterioration of sound absorbing efficiency. <P>SOLUTION: A reinforced layer obtained by binding fibers mainly composed of inorganic materials such as glass and carbon with a binder and forming them into a mat-like shape is provided between a sound absorbing layer and a surface layer composed of a porous material. Alternatively, the reinforced layer is provided in the middle of the sound absorbing layer. The reinforced layer has the unit area weight of 20-200g/m<SP>2</SP>, and permiability of 200 cc/cm<SP>2</SP>/sec or more. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は自動車のエンジンルーム内、特にボンネットの裏側にエンジン音等の騒音を吸音するために装着されるボンネットインシュレータに関するものである。 The present invention relates to a hood insulator that is mounted in an engine room of an automobile, in particular, on the back side of a hood to absorb noise such as engine noise.

エンジンルーム内で発生した騒音を外部に洩れにくくするために、ボンネットの裏側に止着されるボンネットインシュレータは、従来から下記特許文献１〜３に示されている。
特開平５−３１８６３９号公報特開平６−１６０９６号公報特開平１０−１４３１６５号公報 In order to make it difficult for the noise generated in the engine room to leak to the outside, bonnet insulators fixed to the back side of the bonnet are conventionally shown in Patent Documents 1 to 3 below.
JP-A-5-318639 JP-A-6-16096 JP-A-10-143165

ところで、ボンネットインシュレータには耐熱性が必要であると同時に、高い吸音率、および、ボンネットの裏面に止着されるものである点からエンジンルーム内に垂れ下がることがないという長年の形状安定性が要求される。また、ボンネットインシュレータは取付部位からして当然にその厚さにも制限が設けられる。 By the way, bonnet insulators need heat resistance, and at the same time, they require a high sound absorption rate and long-term shape stability that does not hang down in the engine room because they are fastened to the back of the bonnet. Is done. Further, the thickness of the bonnet insulator is naturally limited from the attachment site.

しかし従来のボンネットインシュレータは、吸音性能を高めようとすると厚さや嵩比重が増し、重量も増すという問題があった。また、形状安定性を維持し垂れ下りを防止するために剛性を高める措置を採ると、概して吸音率が低下し吸音性能が悪くするという問題がある。また、熱可塑性樹脂を使用して剛性を高めるとすると耐熱性が低下するという問題があった。そのため、特に車幅の広い自動車のボンネットに取り付ける場合では、垂れ下がりを防止するためにボンネット裏面に多数の止着点を設けざるを得ない状況にあった。 However, the conventional bonnet insulator has a problem that the thickness and bulk specific gravity are increased and the weight is increased when the sound absorbing performance is increased. In addition, when measures are taken to increase rigidity in order to maintain shape stability and prevent sagging, there is a problem that the sound absorption rate generally decreases and the sound absorption performance deteriorates. Further, when the rigidity is increased by using a thermoplastic resin, there is a problem that the heat resistance is lowered. For this reason, in particular, when it is attached to the hood of an automobile having a wide vehicle width, a number of fastening points have to be provided on the back surface of the hood in order to prevent sagging.

本発明上記課題を解決しようとするもので、請求項１に記載のボンネットインシュレータは、ガラス，カーボン等の無機材料を主成分とする繊維をバインダーによって固結させてマット状に成形してなる補強層を多孔質材からなる吸音層と表皮層との間に設けたことを特徴とする。 The present invention is to solve the above-mentioned problems, and the bonnet insulator according to claim 1 is a reinforcement formed by solidifying fibers mainly composed of an inorganic material such as glass and carbon with a binder and molding the fibers into a mat shape. The layer is provided between a sound absorbing layer made of a porous material and a skin layer.

また、請求項２に記載のボンネットインシュレータは、多孔質材からなる吸音層に表皮層を張り合わせたボンネットインシュレータにおける該吸音層の中間に、ガラス，カーボン等の無機材料を主成分とする繊維をバインダーによって固結させてマット状に成形してなる補強層を設けたことを特徴とする。 Further, the bonnet insulator according to claim 2 is characterized in that a fiber mainly composed of an inorganic material such as glass or carbon is bonded to a bonnet insulator in which a skin layer is bonded to a sound absorbing layer made of a porous material. It is characterized in that a reinforcing layer formed by molding into a mat shape is provided.

また、請求項３に記載のボンネットインシュレータは、上記補強層の目付を２０〜２００ｇ／ｍ^２とし、通気度を２００ｃｃ／ｃｍ^２／ｓｅｃ以上としたことを特徴とする。 The bonnet insulator according to claim 3 is characterized in that the basis weight of the reinforcing layer is 20 to 200 g / m ² and the air permeability is 200 cc / cm ² / sec or more.

吸音率が低下することなく剛性が向上し、ボンネット裏への止着点を少なくしても長期にわたり重力により垂れ下がるおそれのないボンネットインシュレータを提供できる。 It is possible to provide a hood insulator that has improved rigidity without lowering the sound absorption coefficient and that does not hang down due to gravity over a long period of time even if the number of fixing points on the back of the hood is reduced.

このボンネットインシュレータは、図１に示すように、吸音層１と表皮層２との間に補強層３を設けてなる。吸音層１はフエルト，グラスウール，ウレタンフォーム等の多孔質材からなる。また、表皮層２はポリプロピレン，ポリエチレン，ポリエステル，ポリスチレン等の熱可塑性合成樹脂からなるものである。補強層３はガラス，カーボン等の無機材料を主成分とする繊維をバインダーによって固結させ、目付２０〜２００ｇ／ｍ^２、通気度２００ｃｃ／ｃｍ^２／ｓｅｃ以上のマット状に成形してなるもので、剛性が高く耐熱性も高いものとなる。このように吸音層１と補強層３と表皮層２を重ね合わせたうえで、これをホットプレスにより加熱・加圧し、熱融着させて所定形状に形成する。なお、補強層３の通気度を２００ｃｃ／ｃｍ^２／ｓｅｃ以上とすることにより所期の吸音性能が維持される。 As shown in FIG. 1, this bonnet insulator is provided with a reinforcing layer 3 between a sound absorbing layer 1 and a skin layer 2. The sound absorbing layer 1 is made of a porous material such as felt, glass wool, or urethane foam. The skin layer 2 is made of a thermoplastic synthetic resin such as polypropylene, polyethylene, polyester, or polystyrene. The reinforcing layer 3 is formed by solidifying fibers mainly composed of an inorganic material such as glass and carbon with a binder and molding the fiber into a mat shape having a basis weight of 20 to 200 g / m ² and an air permeability of 200 cc / cm ² / sec or more. Therefore, it has high rigidity and high heat resistance. In this way, the sound absorbing layer 1, the reinforcing layer 3, and the skin layer 2 are superposed, and then heated and pressed by a hot press, and thermally fused to form a predetermined shape. The desired sound absorbing performance is maintained by setting the air permeability of the reinforcing layer 3 to 200 cc / cm ² / sec or more.

図２はこうして成形されたインシュレータ４をボンネット５の裏面に形成された補強フレーム６に透孔を開設し止ピン７を貫挿することにより止着した状況を示す。このようにインシュレータ４を止着することにより、吸音層１の下側に無機材料を主成分とする繊維であるために温度上昇しても殆ど伸びることなく剛性が高い補強層３が位置するので、同図に示したように止着点を車幅方向に２個所程設けるだけでも重力による垂れ下がりが起きるおそれはなく、長期にわたり品質が保持される。 FIG. 2 shows a state in which the insulator 4 thus molded is fixed by opening a through hole in the reinforcing frame 6 formed on the back surface of the bonnet 5 and inserting a stop pin 7. By fixing the insulator 4 in this way, the reinforcing layer 3 having high rigidity is positioned under the sound absorbing layer 1 so that the fiber is mainly composed of an inorganic material and hardly stretches even when the temperature rises. As shown in the figure, there is no possibility of drooping due to gravity just by providing two fastening points in the vehicle width direction, and the quality is maintained for a long time.

また、上記インシュレータ４の吸音層１として、目付１ｋｇ／ｍ^２，厚さ１５ｍｍのフェルトを用い、表皮層２としては目付７０ｇ／ｍ^２の不織布を用い、補強層３としてはチョップドストランドガラスを接着剤（イソシアネート）によって固結させ目付１００ｇ／ｍ^２のマット状に成形したものを用い、これらを上記のように吸音層１と表皮層２の間に補強層３が位置するように重ね合わせホットプレスすることにより熱融着して形成した製品について、吸音率の測定をした結果を図３に示す。また、比較のために従来のように補強層３が設けられていない製品の吸音率を測定しその結果を同図に併記する。このように、本発明のインシュレータでは、剛性の高い補強層３を設けることによっても吸音率を低下させることなく所期の吸音性能を発揮し得る。このため吸音性能を維持するために、厚さや嵩比重，重量が増すようなおそれもない。 Further, a felt having a basis weight of 1 kg / m ² and a thickness of 15 mm is used as the sound absorbing layer 1 of the insulator 4, a non-woven fabric having a basis weight of 70 g / m ² is used as the skin layer 2, and chopped strand glass is bonded as the reinforcing layer 3. The material is consolidated with an agent (isocyanate) and molded into a mat shape with a basis weight of 100 g / m ² , and these are superposed so that the reinforcing layer 3 is positioned between the sound absorbing layer 1 and the skin layer 2 as described above. FIG. 3 shows the result of measuring the sound absorption coefficient of a product formed by heat-sealing by pressing. For comparison, the sound absorption coefficient of a product not provided with the reinforcing layer 3 as in the prior art is measured, and the result is also shown in FIG. Thus, in the insulator of the present invention, the desired sound absorbing performance can be exhibited without lowering the sound absorption rate even by providing the rigid reinforcing layer 3. For this reason, there is no fear that the thickness, bulk specific gravity, and weight increase in order to maintain the sound absorbing performance.

また、図４は、吸音層１の中間に剛性の高い補強層３を設けたボンネットインシュレータを示し、２は該吸音層１の表面に貼着された表皮層である。該吸音層１は上記実施例１と同様に多孔質材からなり、表皮層２は熱可塑性合成樹脂からなり、補強層３はガラス，カーボン等の無機材料を主成分とする繊維をバインダーによって固結させ目付２０〜２００ｇ／ｍ^２、通気度２００ｃｃ／ｃｍ^２／ｓｅｃ以上のマット状に成形してなる。このように、補強層３を吸音層１の中間に設けることによっても吸音率を低下させることなく剛性が向上しボンネット裏への止着点が少なくても長期にわたり重力による垂れ下がりが防止される。 FIG. 4 shows a bonnet insulator having a highly rigid reinforcing layer 3 in the middle of the sound absorbing layer 1, and 2 is a skin layer adhered to the surface of the sound absorbing layer 1. The sound absorbing layer 1 is made of a porous material as in the first embodiment, the skin layer 2 is made of a thermoplastic synthetic resin, and the reinforcing layer 3 is made of a fiber mainly composed of an inorganic material such as glass or carbon, fixed with a binder. It is formed into a mat shape having a basis weight of 20 to 200 g / m ² and an air permeability of 200 cc / cm ² / sec or more. Thus, even if the reinforcing layer 3 is provided in the middle of the sound absorbing layer 1, the rigidity is improved without lowering the sound absorption rate, and even if there are few fixing points on the back of the hood, drooping due to gravity is prevented for a long time.

本発明に係るボンネットインシュレータの縦断面図。The longitudinal cross-sectional view of the bonnet insulator which concerns on this invention. 本発明に係るボンネットインシュレータの取付状態を示した断面図。Sectional drawing which showed the attachment state of the bonnet insulator which concerns on this invention. 本発明に係るボンネットインシュレータの吸音率測定グラフ。The sound absorption coefficient measurement graph of the bonnet insulator which concerns on this invention. 本発明に係るボンネットインシュレータの縦断面図。The longitudinal cross-sectional view of the bonnet insulator which concerns on this invention.

Explanation of symbols

１吸音層
２表皮層
３補強層
５ボンネット
７止ピン DESCRIPTION OF SYMBOLS 1 Sound absorption layer 2 Skin layer 3 Reinforcement layer 5 Bonnet 7 Stop pin

Claims

It is characterized in that a reinforcing layer formed by solidifying fibers mainly composed of inorganic materials such as glass and carbon with a binder and forming it in a mat shape is provided between a sound absorbing layer made of a porous material and a skin layer. Bonnet insulator.

In the bonnet insulator in which the skin layer is bonded to the sound-absorbing layer made of a porous material, a fiber composed mainly of an inorganic material such as glass or carbon is solidified with a binder and formed into a mat shape between the sound-absorbing layers. A hood insulator having a reinforcing layer.

The bonnet insulator according to claim 1 or 2, wherein the weight of the reinforcing layer is 20 to 200 g / m ² and the air permeability is 200 cc / cm ² / sec or more.