JP2005104307A - Air bag cover - Google Patents

Air bag cover Download PDF

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JP2005104307A
JP2005104307A JP2003340397A JP2003340397A JP2005104307A JP 2005104307 A JP2005104307 A JP 2005104307A JP 2003340397 A JP2003340397 A JP 2003340397A JP 2003340397 A JP2003340397 A JP 2003340397A JP 2005104307 A JP2005104307 A JP 2005104307A
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airbag
base material
surface layer
air bag
material layer
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JP4169672B2 (en
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Shuji Yamada
修司 山田
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Nihon Plast Co Ltd
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Nihon Plast Co Ltd
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Priority to JP2003340397A priority Critical patent/JP4169672B2/en
Priority to DE602004014574T priority patent/DE602004014574D1/en
Priority to US10/953,565 priority patent/US7425018B2/en
Priority to ES04023377T priority patent/ES2308083T3/en
Priority to EP04023377A priority patent/EP1520754B1/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag cover which is an instrument panel integral type air bag cover having a soft decorative surface layer on a base material layer, capable of being surely fractured along a fracture planned line at the time of operation of an air bag device and capable of being integrated visually and tactually without any difference between a surface appearance and an appearance of a peripheral part. <P>SOLUTION: This air bag cover having a fracture planned part covering the expansion direction of the air bag device assembling a housed air bag and forming a door by the deployment of the air bag is provided with a hard resin base material layer 1 arranged on the air bag device side, and soft resin surface layer 3 coated on the base material layer. The fracture planned part is a bottomed groove 2 formed on the base material layer on the side confronting the air bag device, and a rising part 4 is formed on the surface layer corresponding to the groove along the wall of the groove. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、エアバッグカバーに関する。   The present invention relates to an airbag cover.

エアバッグ装置は、自動車が衝撃を受けたときにその衝撃を感知してエアバッグを膨張、展開させて車体と乗員との間に介在させ、これによって乗員を保護するというものである。
近年急速に普及し、その配設箇所も運転席用のステアリングホイール、助手席用のインストルメントパネルだけでなく、乗員を側面部の衝撃から保護する側部用エアバッグが車体側部窓上部に配設されるようになった。
これらの中で、インストルメントパネルの内部に配設される助手席用エアバッグ装置においては、それをカバーするエアバッグカバーをインストルメントパネルとは別体として用意し、これをインストルメントパネルに設けた開口部に組みつけるというのが普通であったが、近年ではこれらを一体化してモジュール化して製造、組み立て作業の合理化を図ると共に、内装部品としてのインストルメントパネルの外観を向上させることが要望されている。 The airbag device senses an impact when the automobile receives an impact, inflates and deploys the airbag, and interposes between the vehicle body and the occupant, thereby protecting the occupant.
In recent years, it has become widespread, and in addition to the steering wheel for the driver's seat and the instrument panel for the passenger's seat, a side airbag that protects the passengers from the impact on the side is located on the upper part of the vehicle side window. It came to be arranged.
Among these, in the airbag device for the passenger seat that is arranged inside the instrument panel, an airbag cover that covers it is prepared separately from the instrument panel, and this is provided on the instrument panel. In recent years, there has been a desire to streamline manufacturing and assembly operations by integrating them into modules, and to improve the appearance of instrument panels as interior parts. Has been.

そして、このようにエアバッグカバー体をインストルメントパネルに一体化したものもすでに提案されており、例えば特開平１１−２９１０６９号（特許文献１）に記載のものは、インストルメントパネルをエアバッグ用開口部を設けずに射出成形し、このパネル裏面のエアバッグ収納位置に対応する箇所にレーザー加工を施し破断予定線を形成するというものである。
また、このようにパネル成形後にエアバッグカバー体を展開するための破断予定線を後加工することなく、成形時にこの破断予定線も形成するという成形方法の提案もされている（特開２００２−２３４４１３、特許文献２）。 And what integrated the airbag cover body in the instrument panel in this way has already been proposed, for example, what is indicated in JP, 11-29069, A (patent documents 1) uses an instrument panel for an airbag. Injection molding is performed without providing an opening, and laser processing is performed at a location corresponding to the airbag storage position on the back of the panel to form a planned fracture line.
In addition, there has also been proposed a molding method in which a planned fracture line is formed at the time of molding without post-processing the planned fracture line for deploying the airbag cover body after panel formation (Japanese Patent Laid-Open No. 2002-2002). 234413, Patent Document 2).

しかしながら、前者の破断予定線を後加工する方法は、このためのレーザー加工機を必要とする上に、成形後に微妙な加工作業を要する等コスト的にも、生産性の観点からも問題がある。
また、後者の成形方法は、後加工を要しない点で合理的な方法であるが、成形型内に破断予定線を形成するためのコアを進退自在に設けることが必要であり、金型も複雑となり、また成形方法も煩雑となる。 However, the former method of post-processing the expected fracture line requires a laser processing machine for this purpose, and also has a problem from the viewpoint of productivity, such as requiring subtle processing operations after molding. .
In addition, the latter molding method is a rational method in that no post-processing is required, but it is necessary to provide a core for forming a planned fracture line in the molding die so that it can be moved forward and backward. It becomes complicated and the molding method becomes complicated.

また、インストルメントパネルは、内装部品であるので、その外観や触感も重要である。そのため、このパネルの表面層を軟質でソフト感のある材料で構成し、これを基材層の上に積層した２層構造のものも各種提案されている。
しかし、このような２層構造とした場合においては、所定の破断特性を安定的に得るのは技術的に難しい。すなわち、本発明者は、従来技術の教示するところに基づいた種々の試行結果から、基材層に設けた溝部の真上に向かって表皮層の破断を安定的に生起させるための技術手段が必要であるとの知見を得ている。これは、エアバッグカバーが下方のエアバッグから均一に押し上げられるとは限らず、段違い***による剪断力が掛かることで、真上方向に対して傾斜した方向に破断が起こりやすくなるからであると推定される。例えばシングルフラップ型（片開き型）のカバーでは、扉形成部とその周縁との関係において、ツインフラップ型（両開き型）のカバーではさらに隣り合うフラップ同士の関係において、不均一に押し上げられる関係がある。この破断角度はところにより真上方向にも類似した方向にもなり得、また、傾斜する場合の角度も一定とはなりにくい。そのため、所望の破断特性を得るための材料の選定、その特定材料の物性を安定的に利用できる成形加工条件の特定と厳密な品質管理を要することとなり、著しいコストアップが懸念されるところである。 In addition, since the instrument panel is an interior part, its appearance and touch are also important. Therefore, various types of two-layer structures in which the surface layer of the panel is made of a soft and soft material and laminated on the base material layer have been proposed.
However, in the case of such a two-layer structure, it is technically difficult to stably obtain a predetermined breaking property. That is, the present inventor has found out from various trial results based on the teachings of the prior art that technical means for stably causing the skin layer to rupture directly above the groove provided in the base material layer. We have the knowledge that it is necessary. This is because the airbag cover is not necessarily pushed up uniformly from the lower airbag, and it is easy to break in a direction inclined with respect to the upward direction by applying a shearing force due to a stepped uplift. Presumed. For example, in the case of a single flap type (single-opening type) cover, the relationship between the door forming portion and the periphery thereof, and in the case of a twin flap type (double-opening type) cover, there is a relationship in which the adjacent flaps are pushed up unevenly is there. This breaking angle can be either a direction directly above or a similar direction, and the angle when tilting is not likely to be constant. Therefore, selection of a material for obtaining desired fracture characteristics, specification of molding processing conditions that can stably use physical properties of the specific material, and strict quality control are required, and there is a concern about a significant increase in cost.

こうした２層構造のエアバッグカバーにおいて、より小さい力で破断予定ラインを確実に破断させるための提案もされている。すなわち、特表２０００−５１２９５３（特許文献３）には、滑らかな表面のカバー層を有するエアバッグのカバー体に、意図した破断ラインの端部を超えてカバー体が破れ続けることなく、カバー体がより小さい力により破断でき、視覚的及び／又は機械的特性を変更することなく、開く力及び破れる力を変えられるように構成した２層エアバッグカバー体の構成が提案されている。
これによれば、基材層の溝部において表面層と基材層とが互いの層の中に延びる部分の間のエッジで破断ラインを形成するとしている。
このような構成とすれば、この２層の接触面で破断されることになり、より確実に破断予定線に沿った設計どおりの破断が可能となるものと思われる。
特開平１１−２９１０６９号 特開２００２−２３４４１３ 特表２０００−５１２９５３ In such an airbag cover having a two-layer structure, proposals have also been made to reliably break the planned break line with a smaller force. That is, in Japanese translations of PCT publication No. 2000-512953 (Patent Document 3), the cover body does not continue to break beyond the end of the intended breaking line on the cover body of the airbag having a smooth surface cover layer. Has been proposed for a two-layer airbag cover body that can be broken by a smaller force and that can change the opening force and breaking force without changing the visual and / or mechanical properties.
According to this, in the groove part of a base material layer, it is supposed that a fracture line will be formed in the edge between the part where a surface layer and a base material layer extend in each other layer.
With such a configuration, the two-layer contact surfaces are ruptured, and it is considered that the rupture as designed along the planned rupture line can be more reliably performed.
JP-A-11-291069 JP2002-234413 Special table 2000-512953

しかしながら、前述のようにエアバッグカバーは、自動車の内装部品であり、その外観や触感もまた重要である。
前記の表面層と基材層とが互いに延びる接触面を破断ラインとする場合には、表面層側にも薄肉部が形成されることとなるが、その結果、もともと肉厚の薄い表面層に更に薄肉部を設けるのであるから、その部分の表面側にも視覚的な影響が及び破断予定線が視覚的に認識されることとなる。また、手、指で触れたときにも周囲の感触と異なることとなり、見栄えや触感に問題が生じる。
更に、溝を設けた基材層上のもともと薄肉とされるソフト感のある表面層に更に薄肉部を設けるのであるから、エアバッグの作動時には破断しやい反面、通常時にも、当該部分が機械的に弱く損傷することも懸念される。 However, as described above, the airbag cover is an interior part of an automobile, and its appearance and feel are also important.
When the contact surface between the surface layer and the base material layer is a fracture line, a thin portion is also formed on the surface layer side. As a result, the surface layer is originally thin. Further, since the thin portion is provided, the visual influence is also recognized on the surface side of the portion, and the expected fracture line is visually recognized. In addition, when touched with a hand or a finger, it differs from the surrounding touch, causing problems in appearance and touch.
Furthermore, since a thin wall portion is provided on the surface layer with a soft feeling that is originally thin on the base material layer provided with the groove, it is easy to break during the operation of the airbag. There is also concern about mechanical weakness and damage.

本発明は、こうした状況の下、基材層の上に軟質の装飾的表面層を設けたインストルメントパネル一体化に好適なエアバッグカバーであって、エアバッグ装置の作動時には破断予定線に沿って確実に破断することができ、安全装置としての信頼性の高いエアバッグカバーであり、かつ、通常時においては、その表面外観が周辺部の外観と何らの相違もなく、視覚的にも触感的にも一体化されるエアバッグカバーを提供することを目的とするものである。
また、本発明は、成形後加工を要せず、また成形に複雑な金型や成形法を要せずに、簡易に成形できるインストルメントパネル一体化に好適なエアバッグカバーを提供することを目的とするものである。 Under such circumstances, the present invention is an airbag cover suitable for instrument panel integration in which a soft decorative surface layer is provided on a base material layer, and is along a planned fracture line when the airbag device is in operation. It is a reliable air bag cover as a safety device that can be reliably broken, and in normal times its surface appearance is no different from the appearance of the surrounding area, and it is visually tactile An object of the present invention is to provide an airbag cover that is also integrated.
In addition, the present invention provides an airbag cover suitable for instrument panel integration that can be easily molded without requiring post-molding processing and without requiring a complicated mold or molding method. It is the purpose.

本発明者は、鋭意検討した結果、軟質表面層を基材層の上に設けた構造のインストルメントパネル一体化に好適なエアバッグカバーにおいて、その破断予定線の構成として、基材層側に有底溝を設け、この溝の壁部に沿って表面層側から***部を形成することが有効であることを知見し、本発明に至った。   As a result of intensive studies, the present inventor has found that the structure of the planned break line is the base material layer side in the airbag cover suitable for instrument panel integration having a structure in which the soft surface layer is provided on the base material layer. It has been found that it is effective to provide a bottomed groove and form a raised portion from the surface layer side along the wall portion of the groove, and the present invention has been achieved.

すなわち、本発明は、
（１）収納されたエアバッグを組み込んだエアバッグ装置の膨出方向を覆いエアバッグの展開によって扉部を形成する破断予定部が形成されたエアバッグカバーであって、
エアバッグ装置側に配置される硬質樹脂製の基材層と、この基材層に積層される軟質樹脂製の表面層を有し、
破断予定部は基材層のエアバッグ装置対向側に設けた有底溝とし、該溝に対応する表面層側には該溝の壁部に沿う***部を形成したことを特徴とするエアバッグカバー、
（２）***部が溝部の左右両側に形成されている前記（１）記載のエアバッグカバー、
（３）インストルメントパネルに一体化された前記（１）または（２）記載のエアバッグカバー、
（４）破断予定部における基材層と表面層との間をエアバッグカバー破断時に積層状態を維持するのに十分な接着強度をもって接着していることを特徴とする前記（１）〜（３）のいずれか１項記載のエアバッグカバー、
（５）表面層の引張強度は７０ｋｇｆ／ｃｍ以下であり、基材層と表面層との接着強度より小である、前記（４）記載のエアバッグカバー、
に関するものである。 That is, the present invention
(1) An airbag cover in which a breakable portion that covers the bulging direction of an airbag device incorporating a stored airbag and forms a door portion by deployment of the airbag is formed;
A hard resin base layer disposed on the airbag device side, and a soft resin surface layer laminated on the base layer;
The airbag is characterized in that the portion to be ruptured is a bottomed groove provided on the side opposite to the airbag device of the base material layer, and a raised portion along the wall portion of the groove is formed on the surface layer side corresponding to the groove. cover,
(2) The airbag cover according to (1), wherein the raised portions are formed on both left and right sides of the groove portion,
(3) The airbag cover according to (1) or (2), which is integrated with an instrument panel,
(4) The above-mentioned (1) to (3), wherein the base material layer and the surface layer in the portion to be broken are bonded with sufficient adhesive strength to maintain the laminated state when the airbag cover is broken. ) The airbag cover according to any one of
(5) The airbag cover according to (4), wherein the tensile strength of the surface layer is 70 kgf / cm or less and is smaller than the adhesive strength between the base material layer and the surface layer,
It is about.

本発明は、エアバッグカバーの破断予定線を形成する基材層の溝部に対応する表面層側から溝部の壁部に沿う***部を設けたことにより、エアバッグ装置が作動してエアバッグが下方からエアバッグを押し上げる際に、その破断予定部に剪断力が生じた場合であっても、破断予定位置のずれを極力抑制することができ、実質上破断予定位置にてエアバッグカバーを破断し、エアバッグを展開することができる。しかも、薄い軟質の表面層には実質的な薄肉部がないため、表面側の外観、触感を損ねることなく周辺と一体化することができる。
更に、本発明のエアバッグカバーは、成形後の後加工を要せずに成形工程のみにより製造するすることができ、かつその成形にも複雑な金型を必要とせず、一般的なインサート成形型で対応することができる。 In the present invention, the airbag device is activated by providing a raised portion along the wall portion of the groove portion from the surface layer side corresponding to the groove portion of the base material layer that forms the planned fracture line of the airbag cover. When pushing up the airbag from below, even if a shear force is generated at the planned breakage portion, the displacement of the planned breakage position can be suppressed as much as possible, and the airbag cover can be broken substantially at the planned breakage position. The airbag can be deployed. In addition, since the thin soft surface layer does not have a substantially thin portion, it can be integrated with the periphery without impairing the appearance and tactile sensation on the surface side.
Furthermore, the airbag cover of the present invention can be manufactured only by a molding process without requiring post-processing after molding, and does not require a complicated mold for molding, so that general insert molding is possible. Can be handled by type.

本発明のエアバッグカバーは、上記のように、基材層とその上に積層された表面層から構成されている。
基材層は、厚み２．５〜４．０ｍｍで、比較的硬質な材料、例えばポリプロピレンをタルクなどで補強したＰＰＣ樹脂で構成することが好ましい。また、その上に積層される表面層は、厚み０．５〜３．０ｍｍで、軟質の材料、例えばポリウレタンで構成することが好ましい。無論これらの材料に制限されるというものではない。要は、基材層がより硬質でエアバッグカバーとしての必要な強度を保持でき、また表面層はより軟質で、好ましくは弾性を有し、表面外観、触感を向上させる材料であればよい。 As described above, the airbag cover of the present invention is composed of the base material layer and the surface layer laminated thereon.
The base material layer is preferably made of a PPC resin having a thickness of 2.5 to 4.0 mm and a relatively hard material such as polypropylene reinforced with talc or the like. Moreover, it is preferable that the surface layer laminated | stacked on it is 0.5-3.0 mm in thickness, and is comprised with a soft material, for example, a polyurethane. Of course, you are not limited to these materials. In short, any material may be used as long as the base material layer is harder and can maintain the necessary strength as an airbag cover, and the surface layer is softer, preferably elastic, and improves the surface appearance and touch.

本発明のエアバッグカバーは、その破断予定線を形成する有底の溝部の周辺の構造が重要である。
すなわち、まず、有底溝とすることにより、エアバッグ膨出によるエアバッグカバー破断時における段違い***の抑制に寄与させ、また、成形時に表面層用の成形材料が溝内に入り込むのを防止させる。
また、該溝部は、基材層においてエアバッグ装置側から、好ましくは溝残厚０．４〜０．８ｍｍとなるように設けられ、その上方の壁部に沿って、表面層が厚肉部を形成し、表面層がその部分で、好ましくは０．５〜１．５ｍｍの***部を形成していることが重要である。表面層は、溝部周辺で特に実質的な薄肉部を形成しない。 In the airbag cover of the present invention, the structure around the bottomed groove portion that forms the planned fracture line is important.
That is, by first forming a bottomed groove, it contributes to the suppression of uneven bulging when the airbag cover is broken due to the expansion of the airbag, and prevents the molding material for the surface layer from entering the groove during molding. .
Further, the groove portion is provided in the base material layer from the airbag device side so that the remaining groove thickness is preferably 0.4 to 0.8 mm, and the surface layer is a thick portion along the upper wall portion. It is important that the surface layer forms a raised portion of preferably 0.5 to 1.5 mm. The surface layer does not form a particularly thin portion around the groove.

破断予定線をこのような構造とすることにより、エアバッグ装置の作動時に下方から膨出しようとするエアバッグの押し上げによる剪断力がかかる場合においても、そのために基材層の溝部から斜め方向、あるいは横方向に破断する場合であっても、わずかなずれで薄肉で軟質の表面層に達することができるので、破断予定線のずれをわずかなずれに抑えることができ、実質的に破断予定線に沿ってエアバッグカバーを展開することができる。
このことに加えて、破断予定部における基材層と表面層とを破断時に積層状態を維持するに十分な接着力を持って接着することにより、表面層が剥離しながら、破断する場合に生じる破断予定部位のずれも防止することができる。 By adopting such a structure for the planned fracture line, even when a shearing force is applied by pushing up the airbag to be inflated from below during operation of the airbag device, an oblique direction from the groove portion of the base material layer for that purpose, Alternatively, even when it breaks in the lateral direction, it can reach a thin and soft surface layer with a slight deviation, so the deviation of the planned breaking line can be suppressed to a slight deviation, and the planned breaking line is substantially reduced. The airbag cover can be deployed along
In addition to this, it occurs when the surface layer peels off while the base layer is peeled off by bonding the base material layer and the surface layer in the planned breaking portion with sufficient adhesive strength to maintain the laminated state at the time of breaking. Deviation of the planned fracture site can also be prevented.

一方、表面層には、溝部に対応する周辺において、特に実質的な薄肉部を形成していないので、エアバッグカバーの表面外観を損なうことはなく、これが一体化されたインストルメントパネルの周辺ともよく融和して視覚的にも触感的にも一体化されて、インストルメントパネルにおいてエアバッグカバーが認識されることはない。
もちろん、本発明の目的の範囲内において、すなわち、表面側へ視覚的、触感的に影響が及ばない限度において、必要に応じて、表面層に周囲に比して薄肉とした部分を設けることも可能である
また、前記破断予定線は、エアバッグカバーの扉部の形状に従い、片開き扉の場合にはコの字型、両開き扉の場合にはＨ型の形に設けることができる。
本発明のエアバッグカバーは特にインストルメントパネル一体化に好適であるが、これに制限されるものではない。 On the other hand, since the surface layer does not have a particularly thin portion in the periphery corresponding to the groove portion, it does not impair the surface appearance of the airbag cover, and the periphery of the instrument panel in which it is integrated It is well integrated and integrated visually and tactilely, and the airbag cover is not recognized on the instrument panel.
Of course, within the scope of the object of the present invention, that is, to the extent that the surface side is not visually or tactilely affected, if necessary, the surface layer may be provided with a portion that is thinner than the surroundings. In addition, the planned breaking line can be provided in a U-shape in the case of a single door and in an H shape in the case of a double door, according to the shape of the door portion of the airbag cover.
The airbag cover of the present invention is particularly suitable for instrument panel integration, but is not limited thereto.

本発明のエアバッグカバーは、常法により、予定破断線を形成する溝部を有する基材層を射出成形により成形し、この上に表面層をポリウレタンの反応射出成形法により容易に形成することができる。   The airbag cover of the present invention can be formed easily by injection molding a base material layer having a groove portion that forms a predetermined fracture line, and a surface layer can be easily formed thereon by polyurethane reaction injection molding. it can.

以下に、本発明の実施例を図面に基づき説明する。
図１は、一体に成形したエアバッグカバーを搭載したインストルメントパネルの斜視図である。図１中、Ｂはその裏面に設けた破断予定線で、ＡとＣとは開裂する扉のヒンジ部を形成する。図２は、図１の矢印を付した箇所の断面であり、図示しないステアリングメンバーに固定されたリアクションカン８のフック９に係合する係合孔部２２が穿設された壁部２１を含むＴＰＯ樹脂製のインナー部材２０を振動溶着などして基材１の裏面に貼着したエアバッグカバーを示している。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of an instrument panel on which an integrally formed airbag cover is mounted. In FIG. 1, B is a planned fracture line provided on the back surface, and A and C form a hinge part of a door to be cleaved. FIG. 2 is a cross-sectional view taken along the arrow in FIG. 1, and includes a wall portion 21 in which an engagement hole 22 is formed to engage with a hook 9 of a reaction can 8 fixed to a steering member (not shown). An air bag cover is shown in which an inner member 20 made of TPO resin is attached to the back surface of the substrate 1 by vibration welding or the like.

ドア部５がエアバッグ１０の膨張により押し上げられて開裂し、それにより形成される開口を通ってエアバッグ１０が車室内に展開する。ドア支持部２３はヒンジ２４を介して壁部２１に結合され、エアバッグ１０の展開時にはヒンジ部Ａ、Ｃに重層するように位置してドア部５を支持する。エアバッグカバーはいわゆるシームレスインパネであり、インストルメントパネル上面についてその略全幅に亘って覆うパネルであり、エアバッグモジュールの搭載位置が容易に認識されないシンプルで周囲とよく融和した外観になっている。
図２及び３において、１は基材層、２は基材層に設けた有底の溝部、３は表面層、４は表面層***部をそれぞれ示す。 The door portion 5 is pushed up by the expansion of the airbag 10 and is cleaved, and the airbag 10 is deployed in the vehicle interior through the opening formed thereby. The door support portion 23 is coupled to the wall portion 21 via a hinge 24 and is positioned so as to overlap the hinge portions A and C when the airbag 10 is deployed to support the door portion 5. The airbag cover is a so-called seamless instrument panel that covers the entire upper surface of the instrument panel over its entire width, and has a simple and well-integrated appearance in which the mounting position of the airbag module is not easily recognized.
2 and 3, reference numeral 1 denotes a base material layer, 2 denotes a bottomed groove provided in the base material layer, 3 denotes a surface layer, and 4 denotes a surface layer raised portion.

表面層***部４の形状は、図２のＢ部に示すように略半円状であっても、同図Ａ部などにあるように、矩形リブ状であってもよく、これらは溝部２の一側（例えばＡ部）にあってもよいし、両側に設けてもよい（例えばＢ部）。また、表面***部は、溝部２に沿って連続的に設けるほか、適宜間隔をあけて間欠的に設けてもよい。
次に成形法について述べると、１はあらかじめ射出成形された基材層でタルクを添加して強度を上げたポリプロピレン樹脂で構成されている。２は基材層に設けた有底の弱部であり、この弱部に対応する部位には遊離のイソシアネート基を有する接着剤が塗布されている（塗布面は図３において有底の弱部２のセンター対応部位を中心に４０ｍｍ幅、すなわち左右に２０ｍｍ幅であり、両側の***部を少し越える範囲まで塗布される）。３は無発泡ポリウレタン樹脂からなる表面層で、該ポリウレタンは平均分子量２０００〜６０００のポリオールとイソシアネートからなる成形材料を使用し、イソシアネートはＭＤＩ、例えばポリオール変性ＭＤＩと非変性ＭＤＩを１：１の重量比で混合したものを用い、インサートされた前記基材上に反応射出成形で積層成形され、かつ前記接着剤との間でウレタン結合により破断時においてもこの間で層剥離が生じないように強く接着されている。４は表面層***部を示す。こうした***部を設けることにより、接着面積を大きくする効果も発現でき、そのことによる接着力の強化も加味されて、エアバッグカバーが段違いに***するような場合であっても、破断部位の位置ずれを極力抑制するでき、実質上破断予定線どおりに開裂することができる。この場合、より一層所望の破断特性を得るために図３に示すような構成において、基材層の弱部を表面層側に突きだし、表面層を薄肉とすることもできる。
なお、表面層の***部４は、弱部に沿って、連続的に設けても、また、適宜間隔をあけて間欠的に設けてもよく、さらに弱部の両側に、また片側だけに設けることもできる。 The shape of the surface layer raised portion 4 may be substantially semicircular as shown in B portion of FIG. 2, or may be rectangular rib shape as shown in A portion of FIG. May be provided on one side (for example, part A) or may be provided on both sides (for example, part B). Further, the surface raised portions may be provided intermittently at appropriate intervals in addition to being provided continuously along the groove portion 2.
Next, the molding method will be described. 1 is composed of a polypropylene resin whose strength is increased by adding talc in a base material layer that has been injection molded in advance. Reference numeral 2 denotes a bottomed weak portion provided in the base material layer, and an adhesive having a free isocyanate group is applied to a portion corresponding to the weak portion (the coated surface is a bottomed weak portion in FIG. 3). 2) It is 40 mm wide around the center-corresponding portion, that is, 20 mm wide on the left and right sides, and is applied to a range slightly exceeding the raised portions on both sides). 3 is a surface layer made of a non-foamed polyurethane resin, and the polyurethane uses a molding material comprising a polyol and an isocyanate having an average molecular weight of 2000 to 6000, and the isocyanate has an MDI, for example, a weight of 1: 1 of polyol-modified MDI and non-modified MDI. Using a mixture in a ratio, it is laminated on the inserted base material by reaction injection molding, and adheres firmly so that no delamination occurs between the adhesive and the adhesive even when it breaks due to urethane bonding Has been. Reference numeral 4 denotes a surface layer ridge. By providing such a raised portion, the effect of increasing the bonding area can be expressed, and the strength of the adhesive force due to this can also be taken into account. The displacement can be suppressed as much as possible, and the fracture can be performed substantially in accordance with the planned fracture line. In this case, in order to obtain a further desired breaking characteristic, in the structure as shown in FIG. 3, the weak part of the base material layer can be protruded to the surface layer side, and the surface layer can be made thin.
The raised portion 4 of the surface layer may be provided continuously along the weak part, or may be provided intermittently at appropriate intervals, and further provided on both sides of the weak part and only on one side. You can also

本発明の一体に形成したエアバッグカバーを搭載したインストルメントパネル一体化エアバッグカバーの斜視図。The perspective view of the instrument panel integrated airbag cover carrying the airbag cover integrally formed of this invention. 図１における矢印箇所の断面説明図。Cross-sectional explanatory drawing of the arrow location in FIG. 図２に示す溝部詳細図で、本発明のエアバッグカバーの破断予定線を形成する溝部の断面説明図。FIG. 3 is a detailed view of the groove portion shown in FIG. 2, and is a cross-sectional explanatory view of the groove portion forming the planned break line of the airbag cover of the present invention.

符号の説明Explanation of symbols

１：基材層
２：溝部
３：表面層
４：表面層***部 1: Base material layer 2: Groove part 3: Surface layer 4: Surface layer raised part

Claims (5)

収納されたエアバッグを組み込んだエアバッグ装置のエアバッグ膨出方向を覆いエアバッグの展開によって扉部を形成する破断予定部が形成されたエアバッグカバーであって、
エアバッグ装置側に配置される硬質樹脂製の基材層と、該基材層に積層される軟質樹脂製の表面層を有し、
破断予定部は基材層のエアバッグ装置対向側に設けた有底溝とし、該溝に対応する表面層には該溝の壁部に沿う***部を形成したことを特徴とするエアバッグカバー。 An airbag cover formed with a planned breakage portion that covers the airbag inflating direction of an airbag device incorporating a stored airbag and forms a door portion by deployment of the airbag;
A base layer made of hard resin disposed on the airbag device side, and a surface layer made of soft resin laminated on the base material layer;
The airbag cover is characterized in that the portion to be broken is a bottomed groove provided on the side opposite to the airbag device of the base material layer, and a raised portion along the wall of the groove is formed on the surface layer corresponding to the groove. . ***部が溝部の左右両側に形成されている請求項１記載のエアバッグカバー   The airbag cover according to claim 1, wherein the raised portions are formed on both left and right sides of the groove portion. インストルメントパネルに一体化された請求項１または２記載のエアバッグカバー。   The airbag cover according to claim 1 or 2, wherein the airbag cover is integrated with the instrument panel. 破断予定部における基材層と表面層との間をエアバッグカバー破断時に積層状態を維持するのに十分な接着強度をもって接着していることを特徴とする請求項１〜３のいずれか１項記載のエアバッグカバー。   The base material layer and the surface layer in the part to be ruptured are bonded with sufficient adhesive strength to maintain a laminated state when the airbag cover is ruptured. The airbag cover described. 表面層の引張強度は７０ｋｇｆ／ｃｍ以下であり、基材層と表面層との接着強度より小である、請求項４記載のエアバッグカバー。

The airbag cover according to claim 4, wherein the tensile strength of the surface layer is 70 kgf / cm or less, which is smaller than the adhesive strength between the base material layer and the surface layer.

JP2003340397A 2003-09-30 2003-09-30 Airbag cover Expired - Fee Related JP4169672B2 (en)

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JP2003340397A JP4169672B2 (en) 2003-09-30 2003-09-30 Airbag cover
DE602004014574T DE602004014574D1 (en) 2003-09-30 2004-09-30 Airbag cover and manufacturing method therefor
US10/953,565 US7425018B2 (en) 2003-09-30 2004-09-30 Vehicle interior panel and production process
ES04023377T ES2308083T3 (en) 2003-09-30 2004-09-30 COVER FOR AIRBAG AND PROCEDURE FOR MANUFACTURING.
EP04023377A EP1520754B1 (en) 2003-09-30 2004-09-30 Airbag cover and its production process

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JP2007090697A (en) * 2005-09-29 2007-04-12 Sumika Bayer Urethane Kk Method of manufacturing automotive interior panel
JP2007130936A (en) * 2005-11-11 2007-05-31 Nippon Plast Co Ltd Method for manufacturing interior parts for automobile and interior material for automobile
WO2007122877A1 (en) 2006-03-30 2007-11-01 Sumitomo Osaka Cement Co., Ltd. Optical modulation element
JP2008087577A (en) * 2006-09-29 2008-04-17 Nippon Plast Co Ltd Airbag cover
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JP2021115919A (en) * 2020-01-23 2021-08-10 豊田合成株式会社 Air bag cover

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JP2006290298A (en) * 2005-04-14 2006-10-26 Nippon Plast Co Ltd Interior panel for automobile
JP4668669B2 (en) * 2005-04-14 2011-04-13 日本プラスト株式会社 Automotive interior panels
JP2007090697A (en) * 2005-09-29 2007-04-12 Sumika Bayer Urethane Kk Method of manufacturing automotive interior panel
JP4690164B2 (en) * 2005-09-29 2011-06-01 住化バイエルウレタン株式会社 Manufacturing method of automotive interior panel
JP2007130936A (en) * 2005-11-11 2007-05-31 Nippon Plast Co Ltd Method for manufacturing interior parts for automobile and interior material for automobile
JP4698391B2 (en) * 2005-11-11 2011-06-08 日本プラスト株式会社 Manufacturing method of interior parts for automobile and interior material for automobile
WO2007122877A1 (en) 2006-03-30 2007-11-01 Sumitomo Osaka Cement Co., Ltd. Optical modulation element
JP2008087577A (en) * 2006-09-29 2008-04-17 Nippon Plast Co Ltd Airbag cover
US7766371B2 (en) 2006-09-29 2010-08-03 Nihon Plast Co., Ltd. Airbag cover for airbag apparatus
JP2009096380A (en) * 2007-10-18 2009-05-07 Denso Corp Vehicular display device
JP2021115919A (en) * 2020-01-23 2021-08-10 豊田合成株式会社 Air bag cover
JP7223340B2 (en) 2020-01-23 2023-02-16 豊田合成株式会社 airbag cover

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