JP2502847B2 - Airbag cover body - Google Patents
Airbag cover bodyInfo
- Publication number
- JP2502847B2 JP2502847B2 JP3182391A JP18239191A JP2502847B2 JP 2502847 B2 JP2502847 B2 JP 2502847B2 JP 3182391 A JP3182391 A JP 3182391A JP 18239191 A JP18239191 A JP 18239191A JP 2502847 B2 JP2502847 B2 JP 2502847B2
- Authority
- JP
- Japan
- Prior art keywords
- cover body
- layer
- airbag cover
- present
- skin
- 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.)
- Expired - Lifetime
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Air Bags (AREA)
- Laminated Bodies (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エアバッグ作動時バッ
クの展開・膨脹により破断されるエアバッグカバー体に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag cover body which is ruptured by the expansion and expansion of a bag when the airbag is operated.
【０００２】[0002]
【従来の技術】従来、エアバッグカバ−体として、硬質
合成樹脂から成る芯材（コア層）の表面に軟質合成樹脂
から成る表皮材（表皮層）を成形して、柔らかさをだ
し、手触りをよくしたり、体が当たった場合に不快感を
感じさせないようにしたものが提案されている。（特開
平１−２０２５５０号公報）この公報に示された二層構
造のカバ−体では、破断線が芯材にスリットを設けるこ
とによって構成されているため、破断線部分は、硬度が
低く、引張り強度も小さい合成樹脂を用いた表皮材だけ
となるので、変形しやすく、折畳まれて圧縮された状態
のガスバッグの反力によってカバ−体の破断線が盛上が
り易く、外観を悪くする恐れが強い。2. Description of the Related Art Conventionally, as an airbag cover body, a skin material (skin layer) made of a soft synthetic resin is formed on the surface of a core material (core layer) made of a hard synthetic resin to give softness and feel. It has been proposed to improve the condition and prevent discomfort when it hits the body. (JP-A-1-202550) In the double-layered cover body disclosed in this publication, the breaking line is formed by providing slits in the core material, so that the breaking line portion has low hardness, Since it is only a skin material that uses a synthetic resin with low tensile strength, it is easily deformed, and the breaking force of the cover body is likely to rise due to the reaction force of the gas bag in the folded and compressed state, which may deteriorate the appearance. Is strong.
【０００３】一方、表皮層を発泡体層とした場合には、
カバ−体内部から押されても発泡体層内部の泡により応
力が吸収、緩和されて、同層の変形が抑制され、破断線
は表面に現出しにくく、見栄えを改善することができ
る。しかし、このような構成とした場合では、芯材層と
表皮層の間の密着性が十分でなく、破断時に両層が剥離
し、飛散物を発生する危険がある。On the other hand, when the skin layer is a foam layer,
Even when pressed from the inside of the cover body, the bubbles inside the foam layer absorb and relieve the stress, the deformation of the layer is suppressed, the fracture line is difficult to appear on the surface, and the appearance can be improved. However, in the case of such a configuration, the adhesion between the core material layer and the skin layer is not sufficient, and there is a risk that both layers will peel off at the time of breakage to generate scattered matter.
【０００４】又、このような芯材層と発泡体表皮層との
間の接着性を向上させる提案もある。すなわち、芯材層
を表裏に連通する気孔を有する樹脂含浸繊維質シートで
形成し、これにホットメルト型接着剤を塗布して真空成
形により発泡体シートを一体化させて、両者の接着力を
向上させるというものである。（特開平１−１２２７５
４号）。There is also a proposal to improve the adhesion between the core material layer and the foam skin layer. That is, the core material layer is formed of a resin-impregnated fibrous sheet having pores communicating with the front and back sides, a hot-melt type adhesive is applied to this, and the foam sheet is integrated by vacuum forming, so that the adhesive force between the two is increased. It is to improve. (JP-A-1-12275
No. 4).
【０００５】[0005]
【発明が解決しようとする課題】前記特開平１−１２２
７５４号の場合、破断部となる弱部として発泡体層には
薄肉部もしくは欠損部を設け、さらにコア層には該薄肉
部、欠損部付近を樹脂含浸量を少なくあるいは含浸させ
ずに非補強部とすることにより形成している。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the case of No. 754, a thin portion or a defective portion is provided in the foam layer as a weak portion which becomes a break portion, and the core layer is not reinforced with a small amount of resin impregnation or without impregnation in the thin portion or the defective portion. It is formed by forming a part.
【０００６】しかし、このカバ−体は発泡体層の破断部
を表皮層側から薄肉とするか、あるいは発泡体内部に空
洞を設けることにより形成しているが、表皮側から薄肉
とした場合は勿論のこと、又、内部に空洞を設けた場合
も成形後の収縮によりカバ−体外表面には破断線が現
れ、見栄えを低下させる。However, this cover body is formed by thinning the broken portion of the foam layer from the skin layer side or by providing a cavity inside the foam body. Of course, when a cavity is provided inside, a break line appears on the outer surface of the cover due to shrinkage after molding, and the appearance is deteriorated.
【０００７】本発明は、こうした実情の下に、外表面に
破断線が現出することがなく、又、ソフトな感触を有す
るとともに、コア層と発泡体表皮層との接着力が十分に
強く破断時飛散物を発生することがなく、又、破断を想
定線に沿って確実に行うことができる信頼性の高いしか
も軽量のエアバッグカバー体を提供することを目的とす
るものである。Under the above circumstances, the present invention has no break lines on the outer surface, has a soft feeling, and has a sufficiently strong adhesive force between the core layer and the foam skin layer. An object of the present invention is to provide a highly reliable and lightweight airbag cover body that does not generate scattered matter at the time of breaking and can surely perform breaking along an assumed line.
【０００８】[0008]
【課題を解決するための手段】本発明者は鋭意検討した
結果、本発明に至った。Means for Solving the Problems As a result of intensive studies, the present inventors have reached the present invention.
【０００９】本発明の要旨は、エアバッグ展開時に破断
する破断部を設けたエアバッグカバー体において、エア
バッグカバー体は硬度の高い熱可塑性エラストマー又は
熱可塑性樹脂からなるコア層と、プライマー層を介して
真空成形により前記コア層に一体化されたインテグラル
スキン型ポリ塩化ビニル発泡体からなる表皮層とから構
成され、破断部はコア層に薄肉部として形成され、かつ
薄肉部には前記真空成形のための吸引孔が設けられてい
ることを特徴とするエアバッグカバー体である。The gist of the present invention is to provide an airbag cover body having a rupture portion which is broken when the airbag is deployed, wherein the airbag cover body comprises a core layer made of a thermoplastic elastomer or thermoplastic resin having high hardness and a primer layer. And a skin layer made of integral skin type polyvinyl chloride foam that is integrated with the core layer by vacuum forming through, the fracture portion is formed as a thin portion in the core layer, and The airbag cover body is provided with a suction hole for molding.
【００１０】本発明におけるコア層は、硬度の高い熱可
塑性エラストマー又は熱可塑性樹脂で構成されるが、熱
可塑性エラストマーとしては、例えば、オレフィン系、
ポリウレタン系、ポリ塩化ビニル系等であり、又、熱可
塑性樹脂としては、例えば、ＡＢＳ、ポリオレフィン、
ポリ塩化ビニル等である。The core layer in the present invention is composed of a thermoplastic elastomer or a thermoplastic resin having a high hardness, and examples of the thermoplastic elastomer include olefin-based,
Polyurethane-based, polyvinyl chloride-based, etc., and examples of the thermoplastic resin include ABS, polyolefin,
For example, polyvinyl chloride.
【００１１】本発明に用いる表皮層は、インテグラルス
キン型のポリ塩化ビニル発泡体で構成しなければならな
い。この発泡体は、周知のようにごく薄いスキン層とそ
れに一体となったスキン層から遠ざかるにつれて徐々に
密度が小さくなるように連続的に変化する発泡層とから
なっている。本発明において表皮層にこのような構造の
発泡体を用いるのは次の理由による。無発泡の表皮層と
一様な発泡層とを接着一体化したものを表皮部として用
いた場合には図４に示すように無発泡表皮層４１と発泡
層４２とでは物性変化が大きいため、亀裂Ａがスムーズ
に延びず、想定破断線に沿った破断が行われず図５（カ
バー体平面説明図）に示すように小片の飛散を招く。こ
れに対して、本発明のインテグラルスキンタイプの発泡
体では図６に示すように発泡層５１からスキン層５２に
至る間の物性変化は連続的であるので、想定破断線に沿
ってスムーズに亀裂Ａが入り、飛散物を発生することは
ない。The skin layer used in the present invention must be made of integral skin type polyvinyl chloride foam. As is well known, this foam comprises an extremely thin skin layer and a foam layer which continuously changes so that the density thereof gradually decreases with distance from the skin layer integrated with the skin layer. The reason why the foam having such a structure is used for the skin layer in the present invention is as follows. When a non-foamed skin layer and a uniform foam layer are integrally bonded and used as the skin portion, the non-foamed skin layer 41 and the foam layer 42 have large physical property changes as shown in FIG. The crack A does not extend smoothly, the fracture is not performed along the assumed fracture line, and the small pieces are scattered as shown in FIG. 5 (plan view of the cover body). On the other hand, in the integral skin type foam of the present invention, as shown in FIG. 6, the change in physical properties from the foam layer 51 to the skin layer 52 is continuous, so that it smoothly follows the assumed break line. The crack A does not enter and no scattered matter is generated.
【００１２】本発明のエアバッグカバー体は、コア層と
表皮層との接着力を十分に高めるため、両層はプライマ
ー層を介して真形成形により強固に一体化される。In the airbag cover body of the present invention, in order to sufficiently enhance the adhesive force between the core layer and the skin layer, both layers are firmly integrated with each other through the primer layer by the true molding.
【００１３】そして、本発明において破断部はコア層に
おいて薄肉部として設けるが、さらに破断を一層確実に
するため、該薄肉部には１mm程度の孔が設けられてい
る。この孔は、又、真空成形の際の吸引孔となるもので
ある。真空成形用の吸引孔は、必要に応じて薄肉部以外
の適宜箇所に設けることもできる。In the present invention, the fractured portion is provided as a thin portion in the core layer. To further assure the fracture, the thinned portion is provided with a hole of about 1 mm. This hole also serves as a suction hole during vacuum forming. The suction hole for vacuum forming can be provided in an appropriate place other than the thin portion, if necessary.
【００１４】[0014]
【実施例】次に、図面に基づいて本発明の実施例を説明
する。Embodiments of the present invention will now be described with reference to the drawings.
【００１５】図２はステアリングホイールに装填された
本発明のエアバッグカバー体の正面図であり、図１は図
２Ｉ−Ｉ線断面図である。図２において１はエアバッグ
カバー体、１ａは表皮層、１ｂはコア層、２はバック、
３はインフレータ、４は破断部となる薄肉部である。図
３は破断部の部分拡大図で、３１は表皮層における薄い
スキン層、３２はインテグラルスキンポリ塩化ビニル発
泡体層、３３はプライマー層、３４は貫通孔である。図
７はコア層の斜視図、図８はその薄肉破断部拡大説明図
である。FIG. 2 is a front view of the airbag cover body of the present invention mounted on the steering wheel, and FIG. 1 is a sectional view taken along the line II--I of FIG. In FIG. 2, 1 is an airbag cover body, 1a is a skin layer, 1b is a core layer, 2 is a back,
Reference numeral 3 is an inflator, and 4 is a thin-walled portion serving as a breaking portion. FIG. 3 is a partially enlarged view of the broken portion, where 31 is a thin skin layer in the skin layer, 32 is an integral skin polyvinyl chloride foam layer, 33 is a primer layer, and 34 is a through hole. FIG. 7 is a perspective view of the core layer, and FIG. 8 is an enlarged explanatory view of the thin-walled broken portion.
【００１６】本発明のエアバッグカバー体の成形は、次
のようにして行うことができる。The airbag cover body of the present invention can be molded as follows.
【００１７】図９に模式的に示すように、真空成形機８
１に前記の硬質材料で成形され、プライマー及びウレタ
ン系接着剤が塗布されたコア層８２がセットされ、この
上に加熱されたポリ塩化ビニルのインテグラルスキン型
発泡体シート８３が下降して真空成形され、本発明のエ
アバッグカバー体が成形される。As shown schematically in FIG. 9, a vacuum forming machine 8
1, a core layer 82 formed of the hard material and coated with a primer and a urethane adhesive is set, and a heated polyvinyl chloride integral skin type foam sheet 83 descends to form a vacuum. After being molded, the airbag cover body of the present invention is molded.
【００１８】[0018]
【発明の効果】以上説明したように、本発明のエアバッ
グカバー体は薄肉破断部に孔を設けたことにより、破断
をより確実、安定に行うことができるとともに、成形作
業性を向上することができる。又、本発明においては表
皮層をインテグラルスキン発泡体とし、コア層にプライ
マー層を介在させて真空成形により強固にコア層と一体
化したことにより、破断時に飛散物が発生することがな
く、信頼性を高めることができる。さらに、破断部は薄
肉部として形成したが、コア層上にはインテグラル発泡
体が存在するため破断線が表面に現出することはなく、
又、ソフトな触感もあり見栄えの点でも優れている。As described above, since the airbag cover body of the present invention is provided with the hole at the thin-walled breaking portion, the breaking can be performed more reliably and stably and the molding workability is improved. You can Further, in the present invention, the skin layer is an integral skin foam, and by solidly integrating with the core layer by vacuum molding with a primer layer interposed in the core layer, scattered matter does not occur at the time of breaking, The reliability can be increased. Further, the fracture portion was formed as a thin portion, but since the integral foam is present on the core layer, the fracture line does not appear on the surface,
It also has a soft texture and is excellent in appearance.
【図１】図２Ｉ−Ｉ線断面説明図、1 is a cross-sectional explanatory view taken along the line I-I of FIG.
【図２】ステアリングホイールに装填された本発明のエ
アバッグカバー体正面図、FIG. 2 is a front view of an airbag cover body of the present invention loaded on a steering wheel,
【図３】本発明のエアバッグカバー体破断部拡大説明
図、FIG. 3 is an enlarged explanatory view of a broken portion of an airbag cover body of the present invention,
【図４】従来のエアバッグカバー体破断時の亀裂説明
図、FIG. 4 is an explanatory view of cracks when the conventional airbag cover body is broken,
【図５】同、エアバッグカバー体表面での亀裂説明図、FIG. 5 is an explanatory view of a crack on the surface of the airbag cover body,
【図６】本発明のエアバッグカバー体破断時の亀裂説明
図、FIG. 6 is an explanatory view of a crack when the airbag cover body of the present invention is broken,
【図７】本発明のエアバッグカバー体におけるコア層の
斜視図、FIG. 7 is a perspective view of a core layer in the airbag cover body of the present invention,
【図８】同破断部拡大説明図、FIG. 8 is an enlarged explanatory view of the fracture portion,
【図９】本発明のエアバッグカバー体の成形説明図。FIG. 9 is an explanatory view of forming the airbag cover body of the present invention.
Claims (1)
けたエアバッグカバー体において、エアバッグカバー体
は硬度の高い熱可塑性エラストマー又は熱可塑性樹脂か
らなるコア層と、プライマー層を介して真空成形により
前記コア層に一体化されたインテグラルスキン型ポリ塩
化ビニル発泡体からなる表皮層とから構成され、破断部
はコア層に薄肉部として形成され、かつ薄肉部には前記
真空成形のための吸引孔が設けられていることを特徴と
するエアバッグカバー体。1. An airbag cover body having a rupture portion that ruptures when the airbag is deployed, wherein the airbag cover body is vacuum-formed via a core layer made of a thermoplastic elastomer or thermoplastic resin having high hardness and a primer layer. By a skin layer made of integral skin type polyvinyl chloride foam integrated with the core layer, the fracture portion is formed as a thin portion in the core layer, and the thin portion for vacuum forming An airbag cover body characterized in that a suction hole is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3182391A JP2502847B2 (en) | 1991-07-23 | 1991-07-23 | Airbag cover body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3182391A JP2502847B2 (en) | 1991-07-23 | 1991-07-23 | Airbag cover body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0592745A JPH0592745A (en) | 1993-04-16 |
| JP2502847B2 true JP2502847B2 (en) | 1996-05-29 |
Family
ID=16117501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3182391A Expired - Lifetime JP2502847B2 (en) | 1991-07-23 | 1991-07-23 | Airbag cover body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2502847B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588176B1 (en) * | 1992-09-16 | 1998-12-02 | Toyoda Gosei Co., Ltd. | A pad for use in an air bag device |
| DE4418172A1 (en) * | 1994-05-25 | 1995-12-14 | Ebers & Mueller Fibrit | Interior trim part |
| US5698283A (en) * | 1995-06-21 | 1997-12-16 | Toyoda Gosei Co., Ltd. | Air bag cover and manufacturing method for same |
| JP2010120566A (en) * | 2008-11-21 | 2010-06-03 | Kanto Auto Works Ltd | Automobile airbag door and its manufacturing method |
| JP2010285021A (en) * | 2009-06-10 | 2010-12-24 | Toyota Motor Corp | Airbag device for vehicle |
| WO2024048521A1 (en) * | 2022-08-31 | 2024-03-07 | マクセル株式会社 | Foamed resin sheet |
-
1991
- 1991-07-23 JP JP3182391A patent/JP2502847B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0592745A (en) | 1993-04-16 |
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