JP2004352105A

JP2004352105A - Air bag device for automobile

Info

Publication number: JP2004352105A
Application number: JP2003152941A
Authority: JP
Inventors: Mitsuo Yasuda; 満雄安田; Takao Kameda; 隆夫亀田; Katsuhiro Takahashi; 克裕高橋
Original assignee: Sanko Gosei Ltd
Current assignee: Sanko Gosei Ltd
Priority date: 2003-05-29
Filing date: 2003-05-29
Publication date: 2004-12-16
Anticipated expiration: 2023-05-29
Also published as: JP4330379B2

Abstract

<P>PROBLEM TO BE SOLVED: To improve a mounting structure especially of a reinforcing member of a burst opening part in an air bag device for an automobile. <P>SOLUTION: The air bag device for the automobile has a reinforcing frame 45 that reinforces the burst opening part 51 and the back surface corresponding to an opening peripheral region of the burst opening part 51 and connects an air bag case. The reinforcing frame 45 is formed of front and back walls and right and left walls into a substantially rectangular cylinder shape, and the air bag case 44 is detachably connected to the front and back walls. Each corner of the rectangularly cylindrical reinforcing frame is provided with a deformation preventing means 60 for reducing deformation by expansion pressure of the air bag at an expansion and development time of the air bag. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車などの車両の衝突時に、助手席や運転席等の車内にいる乗員を正面衝突や側面衝突の衝撃から保護して、乗員の安全性を確保するための自動車用エアーバッグ装置に係り、特に、破断開放部の補強部材の取付構造の改良に関するものである。
【０００２】
【従来の技術】
自動車などの車両に適用される助手席用，運転席用及び左右側柱用等のエアーバッグ装置は、基本的に、エアーバッグと、このエアーバッグを折り畳んだ状態で収容するエアーバッグケースと、エアーバッグを膨張展開するインフレータを備え、このエアーバッグ装置は車両内装パネルの内側に配設される構成になっている。
そして、自動車の内装パネルは、一般的にポリプロピレン樹脂等のプラスチック樹脂材により一体成形されたパネルコアーの表面を覆うポリプロピレン樹脂等のプラスチック樹脂製のインストルメントパネルから構成される。
【０００３】
従来の自動車用エアーバッグ装置は、図１及び図２に示すような破断開放部の脆弱部となる破断溝を見えにくくしたシームレスタイプの助手席用エアーバッグ装置が提供されている。
即ち、図１及び図２において、内装パネル１０には、図示しないレーザ発生手段からパルス状に発生するレーザを、内装パネル１０の裏面側からその裏面に固着する一対の金属製の板材料を折曲成形した補強板材１１，１１の外形縁部に沿って相対移動しながら照射することにより、内装パネル１０の裏面に対して直角方向に形成された長尺方向の前，後ヒンジ溝１０ａと中央破断溝１０ｂ及び短尺方向の破断用溝１０ｃを設けることで、エアーバッグ１２を収容するエアーバッグケース１３の開口部１３ａの大きさに対応するエアーバッグ膨張展開用の破断開放部１４が形成されている。
また、前記破断開放部１４は、長尺方向に形成した中央破断用溝１０ｂ，短尺の左右破断溝１０ｃ、１０ｃによって、前，後破断開放部１５ａ，１５ｂとなりエアーバッグ膨張展開時に、それぞれ前記前，後ヒンジ溝１０ａ，１０ａを介して観音開き状態に破断開口される構成になっている。
【０００４】
前記内装パネル１０の破断開放部１４は、エアーバッグ膨張展開時にエアーバッグ１２の展開圧力により開放される際、前記前，後ヒンジ溝１０ａが前記内装パネル１０より切り離されてしまう場合がある。そのため、前記内装パネル１０の前記破断開放部１４の裏面には、前記一対の補強板材１１，１１の一端水平部１１ａ，１１ａが溶着等の手段によりカシメ固着され、その各他端となる鉛直部１１ｂ，１１ｂが、ヒンジ部１１ｃ，１１ｃを介して折り曲げられて垂下され、この各鉛直部１１ｂ，１１ｂを、前記エアーバッグケース１３の開口部１３ａの外周寸法より僅かに大きな内周寸法を有するようにして前記内装パネル１０の裏面に一体成形された枠状の補強取付部１６の前，後壁とともに、前記ケース１３の前，後壁面１３ｂ，１３ｂに取り付けられたフック部１７に係止する構成とすることで、エアーバッグ膨張展開時に観音開きされた内装パネル１０の破断開放部１４が飛散しないようにしたものである。
なお、前記前，後破断開放部１５ａ，１５ｂの開放を阻害しないようにするため、前記一対の補強板材１１，１１の各他端の鉛直部１１ｂ，１１ｂのフック係止用穴１１ｄ，１１ｄは大きめに設定されており、前記前，後破断開放部１５ａ，１５ｂの開放と共に、前記各鉛直部１１ｂ，１１ｂの上方への移動を可能にし、エアーバッグ膨張展開時の膨張圧力を吸収できるようにしている。
【０００５】
上記のように構成された自動車用エアーバッグ装置においては、車両が衝突した際には、その衝突時の衝撃力をセンサで検出し、このセンサで検出した衝撃力が予め定めた値以上になった否かをＣＰＵ等からなる制御装置で判定し、設定値以上と判定された時に制御装置から出力される信号によりインフレータを動作させて所定のガスを発生させ、このガスをエアーバッグに供給することにより、エアーバッグを急速に膨張展開させる。
【０００６】
すなわち、エアーバッグが膨張展開することにより、その圧力で、内装パネル１０の破断開放部１４が内側から押圧されると、破断開放部１４の破断用溝１０ｂ，１０ｃが破断され、前，後ヒンジ溝１０ａを介して観音開き状態に展開される。そして、観音開き状態に展開された前，後破断開放部１５ａ，１５ｂは各補強板材１１，１１のそれぞれのヒンジ部１１ｃ，１１ｃを介して展開される。
これと同時に、エアーバッグ１２は、開かれた破断開放部１４から内装パネル１０の外方へ膨張展開され、この膨張展開されたエアーバッグ１２の緩衝作用で、助手席の乗員の頭部或いは胸部等を支えることにより、乗員を車両衝突時の衝撃力から保護するようにしている。
【０００７】
【発明が解決しようとする課題】
ところで、上記の自動車用エアーバッグ装置においては、内装パネル１０の破断開放部１４が設けられている開口周縁の下方裏面には水平断面矩形状の補強取付部１６が一体形成され、前，後側壁と左，右側壁とによってほぼ矩形筒状に形成されている。
【０００８】
しかるに、図３の一点鎖線で示すように、エアーバッグ膨張展開時にはエアーバッグ１２の急激な膨張圧力が、前記矩形筒状の前，後側壁１６ａに対し矢印Ｆ１方向に、また前記左，右側壁１６ｂに対しては矢印Ｆ２方向に夫々作用する。
したがって、前記矩形筒状の補強取付部１６の各角隅部１６ｃは、矢印Ｆ３方向の内向きに変形反力が働く。この状態で破断開放部１４が開放されるため、図４に示すように、前記各角隅部１６ｃに対応する破断開放部１６のコーナー破断部にササクレ現象Ｓが生じる不具合がある。
【０００９】
また、エアーバッグ装置の作動時のエアーバッグ膨張初期に、補強取付部１６の内側が外方に押されることで変形し、内装パネル１０の破断開口部縁のコーナーに割れが発生したり、開口周縁が変形して内装パネル１０の外観が損なわれるという問題もある。
【００１０】
本発明は、上記のような従来の課題を解決するためになされたもので、本発明の目的は、前記エアーバッグケースを連結する補強枠体を備えた自動車用エアーバッグ装置において、前記補強枠体を前，後側壁と左，右側壁とによってほぼ矩形筒状に形成し、前記前，後側壁には前記エアーバッグケースを着脱可能に連結できるようにすると共に、矩形筒状の補強枠体の各角隅部には、エアーバッグの膨張展開時の膨張圧力による変形を少なくする変形防止手段を設け、破断開放部およびその開口周辺領域に与える展開圧力を吸収して、破断面にシャープなエッジが生じたり、破断部にささくれ現象が生じるのを予防し、奇麗な破断面とすることができる自動車用エアーバッグ装置を提供することにある。
【００１１】
【課題を解決するための手段】
前記目的を達成するために本発明の請求項１に記載の発明は、自動車の室内に設けられた内装パネルの裏面側に配設され、インフレータからのガスにより膨張展開される前記エアーバッグを折り畳んだ状態で収納するエアーバッグケースと、前記エアーバッグケースの開口と相対向する前記内装パネルの裏面にエアーバッグ展開用の開口形状を決める破断用溝を形成することにより構成される破断開放部と、前記破断開放部及び前記破断開放部の開口周辺領域に対応する裏面を補強すると共に、前記エアーバッグケースを連結する補強枠体を備えた自動車用エアーバッグ装置において、前記補強枠体を前，後側壁と左，右側壁とによってほぼ矩形筒状に形成し、前記前，後側壁には前記エアーバッグケースを着脱可能に連結できるようにすると共に、矩形筒状の補強枠体の各角隅部には、エアーバッグの膨張展開時に発生するエアーバッグの膨張圧力による変形を少なくする変形防止手段を設けたことを特徴とする。
【００１２】
請求項２の発明は、請求項１に記載した自動車用エアーバッグ装置において、前記補強枠体を前記エアーバッグケースを連結する係止部を備えた枠本体と、該枠本体の上部に一体成形された破断開放部用の破断補強部と前記破断開放部の開口周辺領域に対応する裏面を補強する縁補強部とで構成すると共に、前記枠本体の下部は、前，後側壁と左，右側壁とによって矩形筒状に形成し、かつ補強枠体の各角隅部にはエアーバッグの膨張展開時に発生するエアーバッグの膨張圧力による変形を少なくする変形防止手段を設け、前記枠本体の矩形筒状の上部周囲には、拡角方向にほぼ水平に延出する縁補強部を、また前記縁補強部の基部より連続する長手方向に波状の折曲部からなるヒンジ伸び代部を介して内方に分岐する破断補強部を形成し、前記枠本体と一体成形された破断補強部及び縁補強部を前記内装パネルの裏面に振動溶着によって固着するようにしたことを特徴とする。
【００１３】
請求項３の発明は、請求項１に記載した自動車用エアーバッグ装置において、前記変形防止手段は、前，後側壁と左右側壁との交差する補強枠体の各角隅部に、各側壁が外方に突出しエアーバッグ膨張展開時の膨張圧力による変形を少なくするための湾曲部を設けたものであることを特徴とする。
【００１４】
請求項４の発明は、請求項１に記載した自動車用エアーバッグ装置において、前記変形防止手段は、前記内装パネルの裏面と接合する前記補強枠体の各角隅部の接合部分を所望長さ切除した形状としたものであることを特徴とする。
【００１５】
請求項５の発明は、請求項１〜４のいずれか１つに記載した自動車用エアーバッグ装置において、前記枠本体及び一体成形の前記補強枠体をオレフィン系エラストマーなどよりなる低弾性の熱可塑性樹脂材によって一体成形により形成したことを特徴とする。
【００１６】
請求項６の発明は、請求項１〜４のいずれか１つに記載した自動車用エアーバッグ装置において、前記内装パネル裏面に対応する破断補強部及び縁補強部のそれぞれの対応面にはそれぞれ所定間隔をもって突設した筋条の突起部を形成し、これらの突起部を介して前記内装パネル裏面に振動溶着によって互いに固着するようにしたことを特徴とする。
【００１７】
請求項７の発明は、請求項１〜４のいずれか１つに記載した自動車用エアーバッグ装置において、前記枠本体と一体成形された破断補強部及び縁補強部の前記内装パネルの裏面に対応する対応面には、所定間隔で形成した断裂筋状の振動溶着用の突起部を形成したことを特徴とする。
【００１８】
【発明の実施の形態】
次に、本発明にかかる自動車用エアーバッグ装置の一実施形態について、図面を参照して説明する。
図５は本発明にかかる自動車用エアーバッグ装置を助手席用に適用した場合の要部縦断面図、図６は図５における補強枠体の全体斜視図、図７は図６の底面側から見た補強枠体の動作説明図である。
【００１９】
図５において、４０はポリプロピレン樹脂（ＰＰ）などの熱可塑性樹脂を主原料として一体成形された樹脂製のインストルメントパネルカバー（以下内装パネルという）であり、この内装パネル４０は、図示省略の車体に固定された樹脂製のインストルメントパネルコアー（図示省略）の表面を覆うように構成され、タッピングネジ等の適宜の手段により、インストルメントパネルコアーに固定されている。
【００２０】
前記内装パネル４０の左側部分の助手席（右ハンドル車対応）と対向する内側箇所には、図５に示すように、自動車用エアーバッグ装置４１が収容される収容部４２が形成されている。なお、左ハンドル車対応の場合は前記構成と反対の右側部分に設けられる。
【００２１】
前記自動車用エアーバッグ装置４１は、インフレータからのガスにより膨張展開されるエアーバッグ４３と、このエアーバッグ４３を折り畳んだ状態で収容する上方に開口４４ａを有するエアーバッグケース４４と、前記内装パネル４０と同系の熱可塑性樹脂材料を使用して形成された補強枠体４５を構成する枠本体４６と、該枠本体４６の上部に分岐して形成された一対の破断開放部用の破断補強部４７ａ，４７ｂと、破断開放部の開口周縁用の縁補強部４８とからなる。
【００２２】
前記枠本体４６の下部は、前，後側壁４６ａ，４６ｂと左，右側壁４６ｃ，４６ｄとによって矩形筒状に形成されると共に、前記枠本体４６の矩形状の側壁上部には、拡角方向の傾斜面４６ｅを介して四周面がほぼ水平となる前記縁補強部４８が形成され、また前，後側壁４６ａ，４６ｂの上部にはそれぞれ前記縁補強部４８の傾斜面４６ｅの基部から分岐して波状に屈曲されたヒンジ伸び代部４９を介して互いに内方に対応して連続形成された一対の破断補強部４７ａ，４７ｂが形成され、さらに前記矩形筒状の補強枠体４５の各角隅部（コーナー部）は、エアーバッグの膨張展開時に発生するエアーバッグの膨張圧力による変形を少なくする変形防止手段６０を設けてある。
【００２３】
前記変形防止手段６０は、前，後側壁４６ａ，４６ｂと左，右側壁４６ｃ，４６ｄとの交差する各角隅部に各側壁４６ａ，４６ｃ、４６ｂ，４６ｄの連接部が外方に突出する湾曲部６０ａを夫々設けたものである。
【００２４】
また、前記変形防止手段６０の変形例として図８に示すように、前，後側壁４６ａ，４６ｂと左，右側壁４６ｃ，４６ｄとの交差する補強枠体４５の各角隅部４６ｆの内装パネル４０の裏面との接合部分を所望長さをカットした切欠部６１を設けた構成としても、エアーバッグの膨張展開時に発生するエアーバッグの膨張圧力による変形を少なくすることが可能である。
【００２５】
そして、前記枠本体４６及び一体成形された縁補強部４８及び破断補強部４７ａ，４７ｂはオレフィン系エラストマーなどよりなる低弾性の熱可塑性樹脂材によって射出成形により一体形成されたものである。
【００２６】
また、前記内装パネル４０の裏面と対応する前記縁補強部４８及び破断補強部４７ａ，４７ｂの対応面にはそれぞれ所定間隔をもって突設した断裂筋条の突起部５０が形成されており、これらの突起部５０を介して前記内装パネル４０裏面に振動溶着によって互いに固着するようになっている。
【００２７】
また、前記収容部４２と相対向する内装パネル４０には、エアーバッグ４３の膨張展開時にエアーバッグの押圧力により破断されて、開口する破断開放部５１が形成されている。
【００２８】
この破断開放部５１は、内装パネル４０裏面左右長手方向に沿って設けたヒンジ溝４０ａ及び前後の短尺方向に沿って設けた側部破断用溝４０ｃをエアーバッグケース４４の開口４４ａとほぼ同一の長方形状にレーザ加工等により形成することにより構成されるものであり、破断開放部５１の短尺方向すなわち側部破断用溝４０ｃの中間には、破断開放部５１の長尺方向の全長に亘り伸びる中央破断用溝４０ｂがレーザ加工等により形成されており、エアーバッグ４３の膨張展開時に破断開放部５１が側部破断用溝４０ｃと中央破断用溝４０ｂの箇所から破断されることにより、ヒンジ溝４０ａにより構成されるヒンジ５２，５２を介して観音開き状態に展開される前，後の破断開放部５１ａ，５１ｂに分離されるようになっている。
【００２９】
また、前記枠本体４６の長手方向の前，後側壁４６ａ，４６ｂには複数の角穴状の係止部５３が形成されており、前記エアーバッグケース４４の前後側壁に取付けたフック部５４が係止されるようになっている。
【００３０】
本発明の実施形態においては、前記補強枠体４５と破断補強部４７ａ，４７ｂとを一体形成により構成したので、エアーバッグ膨張展開時において、補強枠体４５の各角隅部に作用する展開初期におけるエアーバッグの膨張圧力による変形を少なく抑制することで、破断開放部の変形を防止し、破断開放部５１ａ，５１ｂのスムーズな展開を図ると共に、破断部に生じるササクレ現象Ｓを解消できる。
【００３１】
また、前記補強枠体４５の下方には、エアーバッグ４３を収納したエアーバッグケース４４が配設され、ケース上端開口４４ａの側壁にはフック部５４が設けられており、前記補強枠体４５の係止部５３に貫通係止されるようになっている。このエアーバッグケース４４の下端にはエアーバッグ４３にガスを供給するインフレータ（図示せず）が配設されている。
また、このエアーバッグケース４４は支持部材５５を介してクロスメンバー５６など車体側の固定部材にボルトナット５６ａにより固定されるようになっている。
【００３２】
以上のように構成された本発明の実施の形態による助手席用のエアーバッグ装置によれば、自動車などの車両が衝突した際には、その衝突時の衝撃力を図示省略した周知のセンサで検出し、このセンサで検出した衝撃力が予め定めた値以上になった否かを図示省略した周知のＣＰＵ等からなる制御装置で判定し、設定値以上と判定された時に制御装置から出力される信号により、図示省略した周知のインフレータを動作させて所定のガスを発生させ、このガスをエアーバッグ４３に供給することにより、エアーバッグ４３を急速に膨張展開させる。
【００３３】
エアーバッグ４３が膨張展開する場合、エアーバッグ４３の膨張展開初期時に発生する圧力が破断補強部４７ａ，４７ｂの水平面と補強枠体４５の内側にかかると、補強枠体４５の各角隅部を変形させるような圧力が掛かるが、この膨張圧力を補強枠体４５に設けた変形防止手段６０により少なくできるため、破断面に生じやすいササクレ現象を防止できる。また、枠本体４６と縁補強部４８を開口側に拡がる傾斜で連結されているため、補強枠体４５に対する膨張の影響が少なく，更に縁補強部４８を内下方へ引っ張るようにするため内装パネル４０の開口周縁の拡がりを少なくして割れを防止すると共に、この破断補強部４７ａ，４７ｂの水平面に溶着された破断開放部５１ａ，５１ｂは中央破断用溝４０ｂの脆弱部分から側部の破断用溝４０ｃの脆弱部分に沿い順次破断されると共に、この前，後の破断開放部５１ａ，５１ｂを含む破断補強部４７ａ，４７ｂの水平部は波状の折曲部を有するヒンジ伸び代部４９を介して展開され、破断開放部５１と破断補強部４７ａ，４７ｂとの溶着部分に掛かる無理な圧力抵抗を吸収することができる。
【００３４】
展開最終段階では前記枠本体４６の角穴状の係止部５３のギャップによっても前記圧力を吸収できることで、内装パネル４０の開口周縁に発生する損傷が防止でき、スムーズに観音開き状態に外側へ展開される。
【００３５】
この実施の形態によれば、エアーバッグ膨張展開時の初期に補強枠体４５の各角隅部（コーナー部）に掛かる変形圧力を変形防止手段により緩和すると共に、破断開放部５１の前後，左右の四周囲の開口周辺領域は補強枠体４５の縁補強部４８に溶着されているため、破断開放部５１の開放動作に追従することが抑制され破断用溝４６ｃで速やかに破断されることになり、エアーバッグ４３の膨張展開時に破断された破断開放部５１ａ，５１ｂの破断面にシャープなエッジが生じたり、破断部にささくれ現象が生じるのを予防し、奇麗な破断面を提供できる。
【００３６】
さらに、破断開放部５１の開口周辺領域は補強枠体４５の縁補強部４８により補強されているため、破断開放部５１を含む内装パネル４０の上方からの押圧力に対して耐圧性が増し、エアーバッグ装置の不使用時における内装パネル４０の割れ，歪み等の変形を防止できる。
【００３７】
また、この実施の形態によれば、内装パネル４０と前記補強枠体４５とを同系の熱可塑性樹脂材料で構成すると共に、内装パネル４０に対応する前記補強枠体４５の縁補強部４８と破断補強部４７ａ，４７ｂの対応面には断裂筋条の突起部５０を介して振動溶着するようにしたので、溶着部に熱による変形を生じさせることなく溶着作業が容易にできる。
【００３８】
また、エアーバッグケース４４は補強枠体４５に対して分離可能に結合できる構成になっているため、廃車時などにエアーバッグケース４４を補強枠体４５から容易に取り外すことができ、産業廃棄物となるインフレータなどの関連部品を容易に分離除去でき、環境に悪影響を与えることが防止できる。
【００３９】
なお、前記実施形態におけるヒンジ溝４０ａ及び破断用溝４０ｂ，４０ｃの形成は、内装パネル４０の裏面側よりレーザ加工によって脆弱部を形成するようにしたが、これに限定されることなく、フライス溝加工又は型加工によっても形成出来ることは勿論であり、フライス溝加工による場合は、内装パネルの裏面側より切削して、内装パネルの表面側の肉厚を０．５ｍｍ〜０．８ｍｍの範囲で残し量を設けるようにすると良い。その他、表面パネルの成形時に一体成形する等の方法がある。
【００４０】
【発明の効果】
上記のように構成された自動車用エアーバッグ装置によれば、前記補強枠体を前，後側壁と左，右側壁とによってほぼ矩形筒状に形成し、前記前，後側壁には前記エアーバッグケースを着脱可能に連結できるようにすると共に、矩形筒状の前記補強枠体の各角隅部には、エアーバッグの膨張展開時に発生するエアーバッグの膨張圧力による変形を少なくする変形防止手段を設けた構成としたので、破断開放部およびその開口周辺領域に与える展開圧力を吸収して、破断面にシャープなエッジが生じたり、破断部にささくれ現象が生じるのを予防し、奇麗な破断面とすることができる自動車用エアーバッグ装置を提供することができる。
【００４１】
また、リサイクル時において、従来のように金属製の枠体及び補強板材と樹脂製の内装パネルとを一々分離する作業を省略できる。
更にまた、エアバッグケースが補強枠体に対して分離可能に結合できる構成になっているため、廃車時などにエアーバッグを枠本体から容易に取り外すことができ、インフレータなどの関連部品を容易に分離除去でき、環境に悪影響を与えることが防止出来る効果を有する。
【００４２】
【図面の簡単な説明】
【図１】従来の助手席用エアーバッグ装置の単板状の内装パネルにエアーバッグ膨張展開用の破断開放部を形成した状態を示す部分拡大説明図。
【図２】図２は図１のＡ−Ａ線に沿う概略断面図。
【図３】図２の補強取付枠の底面を示す要部説明図。
【図４】図２の破断開放部のヒンジ部のササクレ現象の生じる状態を示す要部断面図。
【図５】本発明にかかる自動車用エアーバッグ装置を助手席用に適用した場合の実施形態を示す要部の縦断面図。
【図６】図５における補強枠体の全体斜視図。
【図７】本発明にかかる図６の補強枠体を底面側から見た動作説明図。
【図８】本発明にかかる補強枠体に形成した変形防止手段の変形例を示す要部斜視図。
【符号の説明】
４０内装パネル
４０ａヒンジ溝
４０ｂ中央破断用溝
４０ｃ側部破断用溝
４１自動車用エアーバッグ装置
４２収容部
４３エアーバッグ
４４エアーバッグケース
４５補強枠体
４６枠本体
４７ａ，４７ｂ破断補強部
４８縁補強部
４９ヒンジ伸び代部
５０突起部
５１破断開放部
５３角穴状の係止部
５４フック部
６０変形防止手段
６１切欠部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle airbag device for protecting a passenger in a vehicle such as a passenger seat or a driver's seat from a frontal collision or a side collision in the event of a collision of a vehicle such as a vehicle, thereby ensuring passenger safety. In particular, the present invention relates to an improvement in a mounting structure of a reinforcing member at a break opening portion.
[0002]
[Prior art]
An airbag device applied to a vehicle such as an automobile for a passenger seat, a driver's seat, and right and left pillars basically includes an airbag, an airbag case for accommodating the airbag in a folded state, An inflator for inflating and deploying the airbag is provided, and the airbag device is arranged inside a vehicle interior panel.
The interior panel of an automobile is generally composed of an instrument panel made of a plastic resin such as a polypropylene resin which covers the surface of a panel core integrally formed of a plastic resin material such as a polypropylene resin.
[0003]
2. Description of the Related Art Conventional airbag devices for automobiles are provided with a seamless type airbag device for a passenger seat in which a rupture groove, which is a fragile portion of a rupture opening portion, as shown in FIGS.
That is, in FIGS. 1 and 2, the interior panel 10 is formed by folding a pair of metal plate materials that are fixed to the back surface of the interior panel 10 from the back side of the interior panel 10 by applying a pulsed laser generated from a laser generator (not shown). Irradiation is performed while relatively moving along the outer edges of the curved reinforcing plate members 11, 11, so that the front and rear hinge grooves 10 a in the longitudinal direction formed at right angles to the back surface of the interior panel 10 and the center. By providing the breaking groove 10b and the breaking groove 10c in the short direction, a breaking opening portion 14 for inflating and deploying the airbag corresponding to the size of the opening 13a of the airbag case 13 accommodating the airbag 12 is formed. I have.
The break open portion 14 becomes front and rear break open portions 15a and 15b by a center break groove 10b and short left and right break grooves 10c and 10c formed in the longitudinal direction, respectively. , Through the rear hinge grooves 10a, 10a, the opening is opened in a double-open state.
[0004]
When the break opening portion 14 of the interior panel 10 is opened by the deployment pressure of the airbag 12 during inflation and deployment of the airbag, the front and rear hinge grooves 10a may be separated from the interior panel 10. Therefore, one end horizontal portions 11a, 11a of the pair of reinforcing plate members 11, 11 are fixed to the back surface of the break open portion 14 of the interior panel 10 by means of welding or the like, and a vertical portion serving as the other end thereof is provided. 11b, 11b are bent and hung down via the hinges 11c, 11c so that each of the vertical portions 11b, 11b has an inner peripheral dimension slightly larger than the outer peripheral dimension of the opening 13a of the airbag case 13. In addition to the front and rear walls of the frame-shaped reinforcing mounting portion 16 integrally formed on the back surface of the interior panel 10, the hooks 17 are mounted on the front and rear wall surfaces 13b of the case 13. By doing so, the break open portion 14 of the interior panel 10 that is opened double-folded when the airbag is inflated and deployed is prevented from scattering.
In order to prevent the opening of the front and rear breaking opening portions 15a, 15b from being obstructed, the hook locking holes 11d, 11d of the vertical portions 11b, 11b at the other ends of the pair of reinforcing plate members 11, 11 are provided. The front and rear break opening portions 15a, 15b are opened, and the vertical portions 11b, 11b can be moved upward, so that the inflation pressure at the time of inflation and deployment of the airbag can be absorbed. ing.
[0005]
In the vehicle airbag device configured as described above, when a vehicle collides, the impact force at the time of the collision is detected by a sensor, and the impact force detected by the sensor becomes equal to or greater than a predetermined value. Is determined by a control device including a CPU or the like, and when it is determined that the value is equal to or greater than a set value, a signal output from the control device is used to operate an inflator to generate a predetermined gas and supply the gas to an air bag. This causes the airbag to inflate and deploy rapidly.
[0006]
That is, when the airbag is inflated and deployed to press the break opening portion 14 of the interior panel 10 from the inside with the pressure, the breaking grooves 10b and 10c of the break opening portion 14 are broken, and the front and rear hinges are broken. It is developed in a double-open state via the groove 10a. The front and rear break opening portions 15a and 15b are deployed through the hinge portions 11c and 11c of the reinforcing plate members 11 and 11 respectively.
At the same time, the airbag 12 is inflated and deployed from the opened break opening portion 14 to the outside of the interior panel 10, and the cushioning action of the inflated and deployed airbag 12 causes the head or chest of the passenger in the passenger seat. By supporting the vehicle, the occupant is protected from the impact force in the event of a vehicle collision.
[0007]
[Problems to be solved by the invention]
By the way, in the above airbag device for a vehicle, a reinforcing mounting portion 16 having a rectangular horizontal cross section is integrally formed on the lower back surface below the opening edge where the break open portion 14 of the interior panel 10 is provided, and the front and rear side walls are formed. And the left and right side walls to form a substantially rectangular cylindrical shape.
[0008]
However, as shown by the dashed line in FIG. 3, when the airbag is inflated and deployed, the rapid inflation pressure of the airbag 12 is applied to the front and rear side walls 16a of the rectangular tube in the direction of arrow F1, and to the left and right side walls. 16b acts in the direction of arrow F2.
Therefore, a deformation reaction force acts on each corner 16c of the rectangular tubular reinforcing attachment portion 16 inward in the direction of arrow F3. In this state, since the break open portion 14 is opened, there is a problem that the sacrificial phenomenon S occurs at the corner break portion of the break open portion 16 corresponding to each corner 16c as shown in FIG.
[0009]
In addition, in the initial stage of inflation of the airbag during operation of the airbag device, the inside of the reinforcing mounting portion 16 is deformed by being pushed outward, so that a crack is generated at the corner of the break opening edge of the interior panel 10, or There is also a problem that the peripheral edge is deformed and the appearance of the interior panel 10 is impaired.
[0010]
The present invention has been made in order to solve the conventional problems as described above, and an object of the present invention is to provide a vehicle airbag apparatus having a reinforcing frame for connecting the airbag case, The body is formed in a substantially rectangular cylindrical shape by front and rear side walls and left and right side walls, and the air bag case can be detachably connected to the front and rear side walls, and a rectangular cylindrical reinforcing frame is formed. In each corner of the airbag, a deformation preventing means for reducing deformation due to the inflation pressure at the time of inflation and deployment of the airbag is provided. An object of the present invention is to provide an airbag device for an automobile, which can prevent an edge from being generated or an overburden phenomenon at a broken portion and can have a clean broken surface.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention folds the air bag which is disposed on the back side of an interior panel provided in the interior of an automobile and is inflated and deployed by gas from an inflator. An airbag case to be housed in an open state, and a break opening portion formed by forming a break groove for determining an opening shape for airbag deployment on the back surface of the interior panel opposed to the opening of the airbag case. A reinforcing member for reinforcing the back surface corresponding to the opening area of the break opening portion and the opening peripheral region of the break opening portion, and a reinforcing frame connecting the air bag case; The rear side wall and the left and right side walls are formed in a substantially rectangular cylindrical shape, and the front and rear side walls can be detachably connected to the airbag case. Both, each corner portion of the rectangular tubular reinforcing frame, characterized in that a means for preventing deformation to reduce the deformation due to the inflation pressure of the air bag occurring during inflation and deployment of the air bag.
[0012]
According to a second aspect of the present invention, in the airbag device for an automobile according to the first aspect, a frame main body having a locking portion for connecting the reinforcing frame body to the airbag case, and integrally formed on an upper portion of the frame main body. And a reinforced portion for reinforcing the back surface corresponding to the opening peripheral area of the rupture opening portion, and a lower portion of the frame body includes front and rear side walls and left and right sides. A wall is formed in a rectangular cylindrical shape, and at each corner of the reinforcing frame, deformation preventing means for reducing deformation due to the inflation pressure of the airbag generated at the time of inflation and deployment of the airbag is provided, and the rectangular shape of the frame main body is provided. Around the cylindrical upper portion, an edge reinforcement portion extending substantially horizontally in the widening direction, and a hinge extension portion formed of a wavy bent portion in the longitudinal direction that is continuous from the base of the edge reinforcement portion. Forming a fracture reinforcing part that branches inward, Wherein the Kiwaku body and breaking the reinforcing portion is integrally formed and the edge reinforcement portion is so fixed by vibration welding to the rear surface of the interior panel.
[0013]
According to a third aspect of the present invention, in the airbag device for an automobile according to the first aspect, the deformation preventing means includes a side wall at each corner of a reinforcing frame intersecting the front and rear side walls and the left and right side walls. It is characterized in that it is provided with a curved portion projecting outward to reduce deformation due to inflation pressure during inflation and deployment of the airbag.
[0014]
According to a fourth aspect of the present invention, in the airbag device for an automobile according to the first aspect, the deformation preventing means sets a joint portion of each corner of the reinforcing frame to a desired length to be joined to a back surface of the interior panel. It is characterized in that it has a cut shape.
[0015]
According to a fifth aspect of the present invention, in the airbag device for an automobile according to any one of the first to fourth aspects, the frame main body and the integrally molded reinforcing frame are made of a low-elasticity thermoplastic made of an olefin-based elastomer or the like. It is characterized by being formed integrally with a resin material.
[0016]
According to a sixth aspect of the present invention, in the vehicle airbag device according to any one of the first to fourth aspects, a predetermined surface is provided on each corresponding surface of the break reinforcing portion and the edge reinforcing portion corresponding to the back surface of the interior panel. It is characterized in that streak projections projecting at intervals are formed, and are fixed to each other on the back surface of the interior panel by vibration welding via these projections.
[0017]
According to a seventh aspect of the present invention, in the airbag device for an automobile according to any one of the first to fourth aspects, the fracture reinforcing portion and the edge reinforcing portion integrally formed with the frame main body correspond to the back surface of the interior panel. The corresponding surface is characterized in that a tear streak-like vibration welding projection formed at a predetermined interval is formed.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of an automobile airbag device according to the present invention will be described with reference to the drawings.
FIG. 5 is a longitudinal sectional view of a main part when the automobile airbag device according to the present invention is applied to a passenger seat, FIG. 6 is an overall perspective view of a reinforcing frame body in FIG. 5, and FIG. 7 is a bottom view of FIG. It is operation | movement explanatory drawing of the reinforcement frame seen.
[0019]
In FIG. 5, reference numeral 40 denotes a resin instrument panel cover (hereinafter referred to as an interior panel) integrally molded from a thermoplastic resin such as a polypropylene resin (PP) as a main material. It is configured to cover the surface of an instrument panel core (not shown) made of resin fixed to the instrument panel core, and is fixed to the instrument panel core by an appropriate means such as a tapping screw.
[0020]
As shown in FIG. 5, an accommodating portion 42 for accommodating the vehicle airbag device 41 is formed in an inner portion of the interior panel 40 facing the passenger seat (corresponding to a right-hand drive vehicle) on the left side. In the case of a left-hand drive vehicle, it is provided on the right side opposite to the above configuration.
[0021]
The airbag device 41 for an automobile includes an airbag 43 that is inflated and deployed by gas from an inflator, an airbag case 44 having an opening 44a at an upper portion for accommodating the airbag 43 in a folded state, and the interior panel 40. A frame main body 46 constituting a reinforcing frame body 45 formed by using a thermoplastic resin material of the same type as above, and a pair of rupture reinforcing portions 47a for a break open portion formed by being branched on the upper portion of the frame main body 46 , 47b and an edge reinforcing portion 48 for the peripheral edge of the opening of the break open portion.
[0022]
The lower portion of the frame main body 46 is formed in a rectangular cylindrical shape by front and rear side walls 46a and 46b and left and right side walls 46c and 46d. The edge reinforcing portion 48 whose four circumferential surfaces are substantially horizontal is formed via the inclined surface 46e of the edge reinforcing member 46, and the upper portions of the front and rear side walls 46a and 46b are branched from the base of the inclined surface 46e of the edge reinforcing portion 48, respectively. A pair of break reinforcing portions 47a, 47b continuously formed inwardly from each other are formed via hinge extension portions 49 bent in a wavy manner, and each corner of the rectangular cylindrical reinforcing frame 45 is formed. The corners (corners) are provided with deformation preventing means 60 for reducing deformation of the airbag caused by inflation pressure generated when the airbag is inflated and deployed.
[0023]
The deformation preventing means 60 has a curved shape in which the connecting portions of the side walls 46a, 46c, 46b, 46d project outward at the corners where the front and rear side walls 46a, 46b intersect the left and right side walls 46c, 46d. The parts 60a are provided respectively.
[0024]
As a modified example of the deformation preventing means 60, as shown in FIG. 8, the interior panel of each corner 46f of the reinforcing frame 45 intersecting the front and rear side walls 46a, 46b and the left and right side walls 46c, 46d. Even when a cutout portion 61 is formed by cutting a desired length at a joint portion with the back surface of the airbag 40, deformation due to the inflation pressure of the airbag generated when the airbag is inflated and deployed can be reduced.
[0025]
The frame body 46, the integrally formed edge reinforcing portion 48, and the break reinforcing portions 47a, 47b are integrally formed by injection molding using a low-elasticity thermoplastic resin material such as an olefin-based elastomer.
[0026]
Also, on the corresponding surfaces of the edge reinforcing portion 48 and the break reinforcing portions 47a and 47b corresponding to the back surface of the interior panel 40, there are formed projections 50 of tear streaks protruding at predetermined intervals, respectively. They are fixed to each other on the rear surface of the interior panel 40 by vibration welding via the projections 50.
[0027]
In the interior panel 40 facing the housing portion 42, a break opening portion 51 which is broken by the pressing force of the air bag when the air bag 43 is inflated and deployed and is opened by opening is formed.
[0028]
The break opening portion 51 has a hinge groove 40 a provided along the left and right longitudinal direction of the back surface of the interior panel 40 and a side break groove 40 c provided along the front and rear short direction, which are substantially the same as the opening 44 a of the airbag case 44. It is configured by being formed into a rectangular shape by laser processing or the like, and extends in the short direction of the break open portion 51, that is, in the middle of the side break groove 40c, over the entire length of the break open portion 51 in the long direction. The center break groove 40b is formed by laser processing or the like, and when the airbag 43 is inflated and deployed, the break open portion 51 is broken from the side break groove 40c and the center break groove 40b to form a hinge groove. Before being developed into a double-open state through hinges 52, 52 constituted by 40a, the opening is separated into break opening parts 51a, 51b after.
[0029]
Further, a plurality of square hole-shaped locking portions 53 are formed on the front and rear side walls 46a and 46b in the longitudinal direction of the frame body 46, and hook portions 54 attached to the front and rear side walls of the airbag case 44 are provided. It is designed to be locked.
[0030]
In the embodiment of the present invention, since the reinforcing frame 45 and the break reinforcing portions 47a and 47b are integrally formed, the initial stage of deployment acting on each corner of the reinforcing frame 45 at the time of inflating and deploying the airbag. By suppressing the deformation due to the inflation pressure of the airbag in the above, it is possible to prevent the deformation of the break open portions, to smoothly expand the break open portions 51a and 51b, and to eliminate the sacrificial phenomenon S generated in the break portions.
[0031]
An air bag case 44 containing an air bag 43 is provided below the reinforcing frame 45, and a hook portion 54 is provided on a side wall of the case upper opening 44a. It is adapted to be penetrated and locked by the locking portion 53. An inflator (not shown) for supplying gas to the air bag 43 is provided at a lower end of the air bag case 44.
The airbag case 44 is fixed to a fixing member on the vehicle body side such as a cross member 56 via a support member 55 by a bolt nut 56a.
[0032]
According to the airbag device for the passenger seat according to the embodiment of the present invention configured as described above, when a vehicle such as an automobile collides, the impact force at the time of the collision is determined by a well-known sensor (not shown). It is determined by a control device including a well-known CPU or the like (not shown) whether or not the impact force detected by the sensor is equal to or greater than a predetermined value. By operating a well-known inflator (not shown) in response to a predetermined signal, a predetermined gas is generated, and this gas is supplied to the airbag 43, whereby the airbag 43 is rapidly inflated and deployed.
[0033]
When the airbag 43 is inflated and deployed, when the pressure generated at the initial stage of the inflation and deployment of the airbag 43 is applied to the horizontal surfaces of the rupture reinforcing portions 47a and 47b and the inside of the reinforcing frame 45, each corner of the reinforcing frame 45 is removed. Although pressure is applied to cause deformation, the expansion pressure can be reduced by the deformation preventing means 60 provided on the reinforcing frame 45, so that the sacrificial phenomenon that is likely to occur on the fracture surface can be prevented. In addition, since the frame body 46 and the edge reinforcing portion 48 are connected at an inclination extending toward the opening side, the effect of expansion on the reinforcing frame 45 is small, and furthermore, the interior panel is used to pull the edge reinforcing portion 48 inward and downward. In addition to reducing the spread of the opening edge of the opening 40 to prevent cracking, the breaking open portions 51a, 51b welded to the horizontal plane of the breaking reinforcing portions 47a, 47b are used for breaking the side portions from the weak portion of the center breaking groove 40b. The horizontal portions of the break reinforcing portions 47a and 47b including the front and rear break open portions 51a and 51b are sequentially broken along the fragile portion of the groove 40c through a hinge extension portion 49 having a wavy bent portion. It is possible to absorb unreasonable pressure resistance applied to the welded portion between the break open portion 51 and the break reinforcing portions 47a and 47b.
[0034]
In the final stage of deployment, the pressure can be absorbed by the gap of the rectangular hole-shaped locking portion 53 of the frame main body 46, so that damage occurring at the periphery of the opening of the interior panel 40 can be prevented, and the interior panel 40 can be smoothly outwardly opened in a double open state. Is done.
[0035]
According to this embodiment, the deformation pressure applied to the corners (corners) of the reinforcing frame 45 at the initial stage of the inflation and deployment of the airbag is alleviated by the deformation preventing means, and the front, rear, left and right of the break opening 51 is reduced. Since the four peripheral areas around the opening are welded to the edge reinforcing portion 48 of the reinforcing frame 45, it is suppressed from following the opening operation of the breaking open portion 51, so that the breaking is quickly performed by the breaking groove 46c. Thus, it is possible to prevent a sharp edge from being generated in the fractured surfaces of the fractured open portions 51a and 51b that are fractured when the airbag 43 is inflated and deployed, and to prevent the fractured portion from being crushed, thereby providing a beautiful fractured surface.
[0036]
Furthermore, since the opening peripheral region of the break open portion 51 is reinforced by the edge reinforcing portion 48 of the reinforcing frame 45, the pressure resistance against the pressing force from above the interior panel 40 including the break open portion 51 increases, It is possible to prevent the interior panel 40 from being deformed, such as cracking or distortion, when the airbag device is not used.
[0037]
According to this embodiment, the interior panel 40 and the reinforcing frame 45 are made of the same type of thermoplastic resin material, and the edge reinforcing portion 48 of the reinforcing frame 45 corresponding to the interior panel 40 is broken. Vibration welding is performed on the corresponding surfaces of the reinforcing portions 47a and 47b via the projections 50 of the tear streaks, so that the welding operation can be easily performed without causing the welded portions to be deformed by heat.
[0038]
Further, since the airbag case 44 is configured to be separably coupled to the reinforcing frame 45, the airbag case 44 can be easily removed from the reinforcing frame 45 when the vehicle is scrapped, and industrial waste can be removed. Related components such as an inflator can be easily separated and removed, thereby preventing adverse effects on the environment.
[0039]
In the above embodiment, the hinge groove 40a and the break grooves 40b, 40c are formed by forming the fragile portion by laser processing from the back surface side of the interior panel 40. However, the present invention is not limited to this. Of course, it can also be formed by processing or die processing, in the case of milling groove processing, cutting from the back side of the interior panel, the thickness of the front side of the interior panel in the range of 0.5 mm to 0.8 mm It is better to provide a remaining amount. In addition, there is a method of integrally molding the front panel at the time of molding.
[0040]
【The invention's effect】
According to the airbag device for an automobile configured as described above, the reinforcing frame is formed in a substantially rectangular cylindrical shape by the front and rear side walls and the left and right side walls, and the airbag is formed on the front and rear side walls. In addition to enabling the case to be removably connected, a deformation preventing means for reducing deformation due to the inflation pressure of the airbag generated when the airbag is inflated and deployed is provided at each corner of the rectangular cylindrical reinforcing frame. With the structure provided, it absorbs the developing pressure applied to the open part of the fracture and the area around the opening, preventing sharp edges on the fractured surface and preventing the fractured part from being overwhelmed. It is possible to provide an airbag device for a vehicle that can be used as a vehicle.
[0041]
Further, at the time of recycling, it is possible to omit the work of separating the metal frame and the reinforcing plate material and the resin interior panel one by one as in the related art.
Furthermore, since the airbag case is configured to be separable from the reinforcing frame, the airbag can be easily removed from the frame body when the vehicle is scrapped, and related parts such as the inflator can be easily installed. It has the effect that it can be separated and removed, and can be prevented from adversely affecting the environment.
[0042]
[Brief description of the drawings]
FIG. 1 is a partially enlarged explanatory view showing a state in which a break open portion for inflating and deploying an airbag is formed in a single-plate-shaped interior panel of a conventional passenger airbag device.
FIG. 2 is a schematic sectional view taken along line AA of FIG. 1;
FIG. 3 is an essential part explanatory view showing a bottom surface of the reinforcing attachment frame of FIG. 2;
FIG. 4 is a cross-sectional view of a main part showing a state in which a sacrificial phenomenon occurs in a hinge portion of the break open part in FIG. 2;
FIG. 5 is a longitudinal sectional view of an essential part showing an embodiment in which the automobile airbag device according to the present invention is applied to a passenger seat.
FIG. 6 is an overall perspective view of a reinforcing frame body in FIG. 5;
7 is an operation explanatory view of the reinforcing frame body of FIG. 6 according to the present invention as viewed from the bottom surface side.
FIG. 8 is an essential part perspective view showing a modification of the deformation preventing means formed on the reinforcing frame according to the present invention.
[Explanation of symbols]
40 Interior Panel 40a Hinge Groove 40b Center Break Groove 40c Side Break Groove 41 Automotive Airbag Device 42 Housing 43 Airbag 44 Airbag Case 45 Reinforcement Frame 46 Frame Main Body 47a, 47b Break Reinforcement 48 Edge Reinforcement 49 Hinge extension allowance part 50 Projection part 51 Break open part 53 Square hole shaped locking part 54 Hook part 60 Deformation prevention means 61 Notch

Claims

An airbag case that is disposed on the back side of an interior panel provided in the interior of the vehicle and stores the airbag that is inflated and deployed by gas from an inflator in a folded state; and an opening facing the airbag case. A break opening portion formed by forming a break groove for determining an opening shape for airbag deployment on the back surface of the interior panel, and a back surface corresponding to the break opening portion and the opening peripheral region of the break opening portion. In addition to reinforcing, in an airbag device for an automobile having a reinforcing frame for connecting the airbag case,
The reinforcing frame is formed in a substantially rectangular tube shape by front and rear side walls and left and right side walls, and the air bag case can be detachably connected to the front and rear side walls. An airbag device for an automobile, wherein a deformation preventing means for reducing deformation caused by the inflation pressure of the airbag generated when the airbag is inflated and deployed is provided at each corner of the reinforcing frame body.

A frame body having a locking portion for connecting the reinforcing frame to the airbag case, a break reinforcing portion integrally formed on an upper portion of the frame body for a break opening portion, and an opening peripheral region of the break open portion. The lower part of the frame main body is formed in a rectangular cylindrical shape by front and rear side walls and left and right side walls, and each of the rectangular cylindrical reinforcing frame bodies is formed. At the corners, deformation preventing means for reducing deformation due to the inflation pressure of the airbag generated when the airbag is inflated and deployed is provided, and extends substantially horizontally in the widening direction around the rectangular upper portion of the frame body. Forming a reinforced reinforcing portion that branches inward through a hinge extension portion formed of a wavy bent portion in the longitudinal direction that is continuous from the base of the edge reinforcing portion, and is integrated with the frame body. The molded break reinforcing portion and the edge reinforcing portion are connected to the interior panel. Automobile air bag system according to claim 1, characterized in that as fixed by vibration welding on the back of the.

The deformation preventing means includes a curved portion for reducing deformation due to inflation pressure at the time of inflating and deploying the airbag at each corner of the reinforcing frame body where the front and rear side walls intersect with the left and right side walls. The vehicle airbag device according to claim 1, wherein the airbag device is provided with a portion.

The said deformation | transformation prevention means provided the notch part which cut off the joint part of each corner of the said reinforcement frame body joined with the back surface of the said interior panel to desired length. Automotive airbag equipment.

The vehicle according to any one of claims 1 to 4, wherein the frame main body and the integrally molded reinforcing frame are integrally formed of a low-elasticity thermoplastic resin material such as an olefin elastomer. Air bag device.

On the corresponding surfaces of the break reinforcing portion and the edge reinforcing portion corresponding to the back surface of the interior panel, streak projections projecting at predetermined intervals are formed, and the back surface of the interior panel is vibrated through these protrusion portions. The vehicle airbag device according to any one of claims 1 to 4, wherein the airbag device is fixed to each other by welding.

On the surface corresponding to the back surface of the interior panel of the break reinforcing portion and the edge reinforcing portion integrally formed with the frame main body, tear streak-like vibration welding projections formed at predetermined intervals are formed. The vehicle airbag device according to any one of claims 1 to 4, wherein