JP2020044963A - 車両用アンダーカバー - Google Patents
車両用アンダーカバー Download PDFInfo
- Publication number
- JP2020044963A JP2020044963A JP2018174519A JP2018174519A JP2020044963A JP 2020044963 A JP2020044963 A JP 2020044963A JP 2018174519 A JP2018174519 A JP 2018174519A JP 2018174519 A JP2018174519 A JP 2018174519A JP 2020044963 A JP2020044963 A JP 2020044963A
- Authority
- JP
- Japan
- Prior art keywords
- undercover
- synthetic resin
- layer
- vehicle
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
Description
特許文献1に開示された車両用アンダーカバーは、無機繊維と固化した熱可塑性バインダーを含んでニードルパンチされた第一繊維層、及び、無機繊維及び固化した熱可塑性バインダーを含んでニードルパンチされた第二繊維層を有している。第一繊維層と第二繊維層とは、第一繊維層と第二繊維層との間に脆弱層が形成された状態で互いに接着している。
無機繊維、及び、固化した熱可塑性バインダーを含む基材層と、
合成樹脂繊維、及び、固化した熱可塑性バインダーを含み、前記基材層における路面側の面と一体化された外層と、
通気性を有し、前記基材層における車体側の面と一体化された合成樹脂層と、を含み、
通気性を有する車両用アンダーカバーの態様を有する。
まず、図1〜9に示される例を参照して本発明に含まれる技術の概要を説明する。尚、本願の図は模式的に例を示す図であり、これらの図に示される各方向の拡大率は異なることがあり、各図は整合していないことがある。むろん、本技術の各要素は、符号で示される具体例に限定されない。
また、本願において、数値範囲「Min〜Max」は、最小値Min以上、且つ、最大値Max以下を意味する。
本技術の一態様に係る車両用アンダーカバー1は、一体的に成形された車両用アンダーカバー1であって、基材層10、外層20、及び、合成樹脂層30を含む。前記基材層10は、無機繊維11、及び、固化した熱可塑性バインダー12を含んでいる。前記外層20は、合成樹脂繊維21、及び、固化した熱可塑性バインダー22を含み、前記基材層10における路面側の面13aと一体化されている。前記合成樹脂層30は、通気性を有し、前記基材層10における車体側の面13bと一体化されている。本車両用アンダーカバー1は、通気性を有している。
熱可塑性バインダーは、繊維状でもよいし、繊維状でなくてもよい。
基材層には、無機繊維と熱可塑性バインダー以外の材料が含まれてもよい。基材層は、ニードルパンチされた層でもよいし、複数の層を含んでいてもよい。
外層には、合成樹脂繊維と熱可塑性バインダー以外の材料が含まれてもよい。外層も、ニードルパンチされた層でもよいし、複数の層を含んでいてもよい。
基材層における車体側の面と一体化された合成樹脂層は、基材層における車体側の面に含浸した状態でもよい。
合成樹脂層が通気性を有することは、合成樹脂層において一面側から他面側へ空気が流通可能であることを意味する。車両用アンダーカバーが通気性を有することは、車両用アンダーカバーにおいて一面側から他面側へ空気が流通可能であることを意味する。
車両用アンダーカバーは、上述した層以外の部位を有してもよい。
尚、上述した付言は、以下の態様においても適用される。
ところで、本車両用アンダーカバー1の通気度は、0.05〜70cc/cm2/secでもよい。通気度が0.05cc/cm2/sec以上になると、車両用アンダーカバー1の通気性が高まることにより500〜2000Hz程度においてさらに良好な吸音性が得られる。また、通気度が70cc/cm2/sec以下になると、車両用アンダーカバー1の吸音特性のピーク周波数が2000Hz程度以下になることにより500〜2000Hz程度においてさらに良好な吸音性が得られる。従って、本態様は、さらに良好な吸音性を有する車両用アンダーカバーを提供することができる。
ここで、通気度は、JIS L1096:2010(織物及び編物の生地試験方法)に規定されたA法(フラジール形法)に従うものとする。この付言は、以下の態様においても適用される。
また、本車両用アンダーカバー1の目付は、560〜3600g/m2でもよい。目付が3600g/m2以下であるので、本車両用アンダーカバー1は軽量である。目付が560g/m2以上になると、異物の接触に対するさらに良好な耐久性が得られる。従って、本態様は、軽量でありながら、良好な耐久性、及び、良好な吸音性を有する好適な車両用アンダーカバーを提供することができる。
さらに、前記外層20の目付は、50〜400g/m2でもよい。前記合成樹脂層30の目付は、前記外層20の目付よりも小さい範囲で、10〜200g/m2でもよい。外層20の目付が400g/m2以下であって合成樹脂層30の目付が200g/m2以下であるので、本車両用アンダーカバー1は軽量である。合成樹脂層30の目付が10g/m2以上になると、車両用アンダーカバー1の通気度がある程度抑えられるため、500〜2000Hz程度においてさらに良好な吸音性が得られる。外層20の目付が50g/m2以上になると、異物の接触に対するさらに良好な耐久性が得られる。従って、本態様は、軽量でありながら、良好な耐久性、及び、良好な吸音性を有する好適な車両用アンダーカバーを提供することができる。
図1,2は、アンダーカバーを有する自動車の例を模式的に示している。図1,2に示す自動車100は、道路上で使用されるように設計及び装備された路上走行自動車であり、車体101に囲まれた車室CA1を有する乗用自動車であるものとする。これらの図中、FRONT、REAR、LEFT、RIGHT、UP、DOWNは、それぞれ、前、後、左、右、上、下を示す。左右の位置関係は、車室CA1内の運転席に座って前を見る方向を基準とする。図1に示す自動車100において、前輪のタイヤ111と後輪のタイヤ112が路面200と接触している。
尚、繊維材60の熱可塑性バインダー12が繊維でない場合も、本技術に含まれる。
尚、表皮材70の熱可塑性バインダー22が繊維でない場合も、本技術に含まれる。
プレス成形されたアンダーカバー1の密度は、例えば、0.05〜0.5g/cm3、より好ましくは0.1〜0.3g/cm3とすることができる。
次に、図7等を参照してアンダーカバー1の製造方法の例を説明する。
図7は、図3で示したような各層20,10,30を有するアンダーカバー1を製造する具体例を示している。図7に示す製造方法では、まず、各層20,10,30を形成するための表皮材70、繊維材60、及び、合成樹脂フィルム80を順に重ねる(材料積層工程S1)。表皮材70は、合成樹脂繊維21と繊維状熱可塑性バインダー22を含む繊維材料をカーディングしシート状に配置してニードルパンチ加工機でニードルパンチすることにより形成されてもよい。繊維材60は、無機繊維11と繊維状熱可塑性バインダー12とを含む繊維材料をカーディングしマット状に配置してニードルパンチ加工機でニードルパンチすることにより形成されてもよい。合成樹脂フィルム80は、溶融状態又は液状の合成樹脂を押出成形機のTダイ(フラットダイ)からフィルム状に押し出し成形されて繊維材60の表面(車体側の面13b)に形成されてもよい。
尚、本工程S3や予備プレス工程S2の加熱は、赤外線ヒーターによる輻射加熱、サクションヒーター(熱風循環ヒーター)による熱風加熱、熱プレスによる接触加熱、これらの組合せ、等により行うことができる。
以上説明したようにして、図3で示したような各層20,10,30を有するアンダーカバー1を製造することができる。むろん、図6A〜6Cで示したアンダーカバー1も、同様の製造方法により製造することができる。
以下、実施例を示して具体的に本発明を説明するが、本発明は以下の例により限定されるものではない。
繊維材60には、ガラス繊維(無機繊維11の例)とPP繊維(熱可塑性バインダー12の例)を含んでニードルパンチされた繊維材料(目付550g/m2)を2層重ねた繊維材を用いた。路面側の表皮材70には、PET繊維(合成樹脂繊維21の例)とPP繊維(熱可塑性バインダー22の例)を含む不織布(目付200g/m2)を用いた。合成樹脂フィルム80の材料には、LLDPEを用いた。
表皮材70と繊維材60(2層の繊維材料)を順に重ね、加熱して溶融させたLLDPEを目付80g/m2となるように押出成形機のTダイから押し出して繊維材60の表面に合成樹脂フィルム80を重ねた。
その後、図7で示した製造方法に従って、厚さT1が7mmとなるように図6Bで示したような各層20,10,30を有するアンダーカバー1のサンプルを形成した。得られたサンプルの通気度は、8.5cc/cm2/secであった。
合成樹脂フィルム80を繊維材60に重ねなかった以外は実施例1と同様にして、外層20及び基材層10を有するが合成樹脂層30の無いアンダーカバーのサンプルを形成した。得られたサンプルの通気度は、16cc/cm2/secであった。
実施例1及び比較例1のサンプルについて、それぞれ、車体側に空気層を10mm設定し、JIS A1409:1998(残響室法吸音率の測定方法)に規定された測定方法に従って1/3オクターブバンド中心周波数(Hz)の残響室法吸音率を求めた。
材料の目付及びサンプルの厚さT1を調節して通気度を4.8〜11.1cc/cm2/secの範囲で6段階に変えてアンダーカバーのサンプルを調製した。各試験区1〜6のサンプルは、図6Bで示したような各層20,10,30を有する。ここで、各試験区とサンプルの通気度との対応関係は、以下の通りである。
試験区1: 4.8cc/cm2/sec
試験区2: 6.6cc/cm2/sec
試験区3: 7.5cc/cm2/sec
試験区4: 7.6cc/cm2/sec
試験区5: 8.5cc/cm2/sec
試験区6:11.1cc/cm2/sec
尚、試験区5のサンプルは、実施例1のサンプルと同じである。
本発明は、他にも種々の変形例が考えられる。
例えば、繊維材60として繊維材料を複数重ねる場合、或る繊維材料と別の繊維材料とで無機繊維11と熱可塑性バインダー12の少なくとも一方を異なる種類にしてもよい。すなわち、基材層10が複数の層を含む場合、或る層と別の層とで無機繊維11と熱可塑性バインダー12の少なくとも一方が異なる種類であってもよい。
以上説明したように、本発明によると、種々の態様により、軽量でありながら、異物の接触に対する良好な耐久性、及び、良好な吸音性を有する車両用アンダーカバー等の技術を提供することができる。むろん、独立請求項に係る構成要件のみからなる技術でも、上述した基本的な作用、効果が得られる。
また、上述した例の中で開示した各構成を相互に置換したり組み合わせを変更したりした構成、公知技術及び上述した例の中で開示した各構成を相互に置換したり組み合わせを変更したりした構成、等も実施可能である。本発明は、これらの構成等も含まれる。
1c…フロントフロアアンダーカバー、1d…リヤフロアアンダーカバー、
2a…路面側の面、2b…車体側の面、
10…基材層、11…無機繊維、12…熱可塑性バインダー、
13a…路面側の面、13b…車体側の面、
20…外層、21…合成樹脂繊維、22…熱可塑性バインダー、
30…合成樹脂層、31…開口、
50…積層材料、60…繊維材、70…表皮材、80…合成樹脂フィルム、
100…自動車、101…車体、111,112…タイヤ、200…路面、
300…プレス成形装置、310,320…型、
CA1…車室、D1…厚さ方向。
Claims (4)
- 一体的に成形された車両用アンダーカバーであって、
無機繊維、及び、固化した熱可塑性バインダーを含む基材層と、
合成樹脂繊維、及び、固化した熱可塑性バインダーを含み、前記基材層における路面側の面と一体化された外層と、
通気性を有し、前記基材層における車体側の面と一体化された合成樹脂層と、を含み、
通気性を有する車両用アンダーカバー。 - 本車両用アンダーカバーの通気度は、0.05cc/cm2/sec以上、70cc/cm2/sec以下である、請求項1に記載の車両用アンダーカバー。
- 本車両用アンダーカバーの目付は、560g/m2以上、3600g/m2以下である、請求項1又は請求項2に記載の車両用アンダーカバー。
- 前記外層の目付は、50g/m2以上、400g/m2以下であり、
前記合成樹脂層の目付は、前記外層の目付よりも小さい範囲で、10g/m2以上、200g/m2以下である、請求項1〜請求項3のいずれか一項に記載の車両用アンダーカバー。
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JP7431121B2 (ja) | 2020-07-28 | 2024-02-14 | 林テレンプ株式会社 | 車両用サイレンサー、及び、その製造方法 |
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