JP2004352106A - Air bag device for automobile - Google Patents

Air bag device for automobile Download PDF

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Publication number
JP2004352106A
JP2004352106A JP2003152942A JP2003152942A JP2004352106A JP 2004352106 A JP2004352106 A JP 2004352106A JP 2003152942 A JP2003152942 A JP 2003152942A JP 2003152942 A JP2003152942 A JP 2003152942A JP 2004352106 A JP2004352106 A JP 2004352106A
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JP
Japan
Prior art keywords
airbag
interior panel
reinforcing
opening
back surface
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.)
Pending
Application number
JP2003152942A
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Japanese (ja)
Inventor
Mitsuo Yasuda
満雄 安田
Shuichi Nanayama
修一 七山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanko Gosei Ltd
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Sanko Gosei Ltd
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Filing date
Publication date
Application filed by Sanko Gosei Ltd filed Critical Sanko Gosei Ltd
Priority to JP2003152942A priority Critical patent/JP2004352106A/en
Publication of JP2004352106A publication Critical patent/JP2004352106A/en
Pending legal-status Critical Current

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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: In the air bag device for the automobile, the back surface side corresponding to an opening peripheral region of the burst opening part 51 is provided with a reinforcing frame 45 formed of a rectangularly cylindrical horizontal cross section having front and back walls 46a and 46b and left and right walls 46c and 46d. The upper outer periphery of the reinforcing frame 45 is provided with an edge reinforcing part 48 for reinforcing the back surface corresponding to the opening peripheral region of the burst opening part 51. A corresponding upper inner surface of the front and back walls 46a and 46b is provided with a projection suppressing piece 46 for absorbing air bag expansion pressure applied to a hinge part 49 of the burst opening part 51. <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リブ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展開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補強板材11,11や補強取付部16が設けられているものの、これら補強板材11,11や補強取付部16は、エアーバッグケース13の組付性や前,後破断開放部15a,15bの開放容易性のため、フック部17との係合角穴に上下方向にガタが設けられており、内装パネル10の上面すなわち表面側からの押圧力を支持する構造にはなっておらず、乗車中に誤って上面より内装パネル10に負荷を掛けると、前,後ヒンジ溝10a,10aや中央破断溝10bおよび破断溝10c,10cが破断されてしまう等、破断開放部14が凹状にへこんだり、開口周縁が変形したりして内装パネル10の外観が損なわれるという問題点がある。
【0008】
また、内装パネル10と補強取付部16とは樹脂成形により一体形成されるが、成形時にヒケなどが生じ外観よりの見栄えが悪くなり、結果的に製品の歩留まりに悪影響を与える問題点がある。
【0009】
さらに、エアーバッグ装置の作動のエアーバッグ膨張初期に、補強取付部16の内側が外に押され、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、飛散するなどの不具合が考えられる。
【0010】
さらにまた、前記内装パネル10の破断開放部14の裏面には、中央破断溝10bを挟んで破断開放部14の前後方向から伸びる補強板材11,11が溶着により固定されているが、前記補強板材11,11は金属製の板材を使用しており、エアーバッグ膨張展開時において、破断開放部14が反転した状態では金属製の補強板材11,11が露出することで安全性に問題があると共に、リサイクル時に金属製板材によって形成した補強板材11,11とプラスチック製の内装パネル10とを分離するにあっては両者が互いに溶着カシメにより固着されているため分離作業がしにくいという問題点があった。
【0011】
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、車両の内側フロント部や側柱部、ハンドル中央部等を覆う内装パネルの破断開放部及びその開口の外周縁近傍への外方からの押圧負荷に対する耐圧性を向上できるようにすると共に、内装パネルの破断開放部の外周囲の裏面を補強する縁補強部を有する補強枠体を内装パネルとは別体構成で形成すると共に、補強枠体を内装パネル材料と同系の熱可塑性プラスチック材料で形成することで、内装パネルと補強枠体との接合を振動溶着によって行なうことができるようにし、組み付けを容易にし、かつリサイクル時における分離作業を不要とした自動車用エアーバッグ装置を提供することにある。
【0012】
さらにまた、前記補強枠の前,後側壁の縁補強部に対応する上部内方に突出させた突出抑制片を設けることで、エアーバッグの膨張展開時における破断開放部のヒンジ部へ掛かる膨張圧力を少なくし、破断開口部の破断面に生じるササクレ現象を防止することを目的とする。
【0013】
【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を備えた自動車用エアーバッグ装置において、前記破断開放部の開口周辺領域に対応する裏面側に、別体構成の前,後側壁と左,右側壁を有する水平断面が矩形筒状に形成された補強枠体を配設し、該補強枠体の上部外周に形成した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を前記内装パネルの裏面に振動溶着により取付けたことを特徴とする。
請求項2の発明は、前記請求項1に記載した自動車用エアーバッグ装置において、前記補強枠体は、前,後側壁の上部内面側に対応して突出させた突出抑制片を設けると共に、前記補強枠体の前記縁補強部が内装パネル裏面に溶着された状態で、前記突出抑制片と前記破断開放部裏面との間に隙間を持たせるようにし、かつ前,後側壁の中間部には前記エアーバッグケースを係止する係止部を形成したことを特徴とする。
請求項3の発明は、請求項1又は2に記載した自動車用エアーバッグ装置において、前記補強枠体は、前記内装パネルと同系の熱可塑性プラスチック材料で形成したことを特徴とする。
【発明の実施の形態】
以下、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3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4は図3における補強枠体の全体斜視図である。
【0014】
図3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。
【0015】
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3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。
【0016】
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とからなる。
【0017】
該補強枠体45は前記内装パネル40とは別体で形成されており、その態様は、前,後側壁46a,46bと左,右側壁46c,46dとによって、前記破断開放部51と対応する大きさの矩形筒状に形成されると共に、前記補強枠体45の矩形筒状の上部外周には、前記破断開放部51の開口周縁用の縁補強部48が設けられ、さらに前記前,後側壁46a46bの対向内面側に突出する突出抑制片46が形成されている。なお、突出規制片46は左,右側壁面46c,46d内面壁とは切り込みによって離間されている。
前記縁補強部48の上面には筋条に突出させた振動用着用の突起部50が形成され、前記内装パネル裏面に溶着されるようになっている。
また、一対の対向配設された突出抑制片46は、エアーバッグ43の膨張展開時に、エアーバッグ43が破断開放部のヒンジ部49に掛かる膨張圧力を少なくするするためのものである。
【0018】
前記補強枠体45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。
【0019】
そして、前記補強枠体45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。
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。
【0020】
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。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のヒンジ52,52を介して観音開き状態に展開され前,後の破断開放部51a,51bに分離されるようになっている。
【0021】
また、前記補強枠体45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。そして、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。
【0022】
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。
【0023】
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破断開放部51の裏面側に発生するエアーバッグ43の膨張圧力が補強枠体45の突出抑制片46によって小さく緩和され、破断開放部51a,51bのヒンジ部49に加わる衝撃圧力が吸収されることで、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、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。
また、補強枠体45の縁補強部48と内装パネル40との溶着部分に掛かる無理な圧力をも吸収することができ、内装パネル40の開口周縁に発生する損傷が防止できる。
【0024】
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及び突出抑制片46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。
【0025】
さらにまた、前記実施形態においては、補強枠体45の前,後側壁46a,46bの上部内面側に突出する突出抑制片46設けた構成としたが、補強枠体45に縁補強部48のみを設け、前記突出抑制片46を設けない単純な構成とすることも勿論可能である。
【0026】
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の対応面には断裂筋条の突起部50を配設したので、振動溶着する場合に、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である。
【0027】
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。
【0028】
また、前記実施の形態では、破断開放部51の長手方向の中央部が観音開きに開口する構成について説明したが、これに限られることなく、破断開放部が片開き、4方開き構成のものについても適用できることは勿論である。
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。
【0029】
【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、前記破断開放部の開口周辺領域に対応する裏面側に、別体構成の前,後側壁と左,右側壁を有する水平断面が矩形筒状に形成された補強枠体を配設し、該補強枠体の上部外周に形成した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を前記内装パネルの裏面に振動溶着により取付けた構成としたので、内装パネルの破断開放部及びその開口の外周縁近傍への外方からの押圧負荷に対する耐圧性を向上できる。
【0030】
また、内装パネルの破断開放部の外周囲の裏面を補強する縁補強部を有する補強枠体を内装パネル材料と同系の熱可塑性プラスチック材料で形成することで、内装パネルと補強枠体との接合を振動溶着によって行なうことができ、構成が簡単で且つ組み付けを容易にし、かつリサイクル時における分離作業を不要とすることができる。
【0031】
さらにまた、従来一体成形されていた内装パネルと補強枠体とを別体構成で成形し、互いに溶着するようにしたので、内装パネルの表面側に成形時に生じるヒケなどが防止でき、外観よりの見栄がよくなり、結果的に製品の歩留まりが向上する。
【0032】
また、補強枠体の上部内方に突出する突出抑制片をもうけたので、エアーバッグ装置作動におけるエアーバッグ膨張初期に、破断開放部のヒンジ部に掛かるエアーバッグの膨張圧力を小さく緩和することができるので、内装パネルの破断開口部縁のコーナーに生じる割れが防止でき、飛散等の不具合が防止できる。
【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】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4】図3における補強枠体の全体斜視図。
【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 突出抑制片
47a,47b 破断補強部
48 縁補強部
49 ヒンジ部
50 突起部
51 破断開放部
53 角穴状の係止部
54 フック部
[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]
Airbag devices for passenger seats, driver's seats, left and right pillars, etc., applied to vehicles such as automobiles, are basically airbags and airbag cases for accommodating the airbags in a folded state. And an inflator for inflating and deploying the airbag, and the airbag device is arranged inside the 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 As a conventional airbag device for a vehicle, a seamless type airbag device for a passenger seat in which a break groove of a break open 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.
In addition, the break opening portion 14 becomes front and rear break opening portions 15a and 15b by a center breaking groove 10b and a short left and right breaking groove 10c and 10c formed in a longitudinal direction, respectively. The front and rear hinge grooves 10a, 10a are configured so as to be broken open 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 caulked and fixed to the back surface of the break open portion 14 of the interior panel 10 by means such as welding, and the vertical portions 11b serving as the other ends thereof are welded. , 11b are bent and hung down via the hinge portions 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 ribs 16 integrally formed on the back surface of the interior panel 10, the hooks 17 are attached to the front and rear wall surfaces 13b of the case 13. Thus, the break opening portion 14 of the interior panel 10 which is opened double 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 deployment 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 occupant 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-mentioned automobile airbag device, although the reinforcing plate members 11 and 11 and the reinforcing mounting portion 16 are provided on the lower back surface below the opening edge where the break opening portion 14 of the interior panel 10 is provided. The reinforcing plate members 11, 11 and the reinforcing mounting portion 16 are vertically inserted into the square holes for engagement with the hook portions 17 in order to assemble the airbag case 13 and to easily open the front and rear breaking open portions 15a, 15b. A play is provided, and the structure is not configured to support the pressing force from the upper surface, that is, the front surface side of the interior panel 10. If a load is applied to the interior panel 10 from the upper surface by mistake during riding, the front and rear hinges are provided. The appearance of the interior panel 10 is such that the opening 10 is dented in a concave shape or the periphery of the opening is deformed, for example, the grooves 10a, 10a, the center breaking groove 10b, and the breaking grooves 10c, 10c are broken. There is a problem that is impaired.
[0008]
Further, although the interior panel 10 and the reinforcing mounting portion 16 are integrally formed by resin molding, sink marks and the like occur during molding, resulting in a poor appearance from the appearance, and as a result, there is a problem that the product yield is adversely affected.
[0009]
Further, in the initial stage of the airbag inflation of the operation of the airbag device, the inside of the reinforcing attachment portion 16 is pushed out, and a crack may be generated at the corner of the rupture opening edge of the interior panel 10 and the malfunction may occur. .
[0010]
Further, reinforcing plates 11, 11 extending in the front-rear direction of the breaking open portion 14 with the center breaking groove 10b interposed therebetween are fixed to the back surface of the breaking open portion 14 of the interior panel 10 by welding. Metal plates 11 and 11 are used, and when the airbag is inflated and deployed, the metal reinforcing plates 11 and 11 are exposed when the break open portion 14 is inverted, and there is a problem in safety as well. When separating the reinforcing plate members 11, 11 formed of metal plate materials and the plastic interior panel 10 during recycling, there is a problem that the separation work is difficult because the two are fixed to each other by welding and caulking. Was.
[0011]
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 break opening part of an interior panel that covers an inner front part, a side pillar part, a steering wheel central part, and the like of a vehicle. A reinforcing frame body having an edge reinforcing portion for improving the pressure resistance against a pressing load from the outside to the vicinity of the outer peripheral edge of the opening and having an edge reinforcing portion for reinforcing the outer peripheral back surface of the break open portion of the interior panel. In addition to being formed in a separate structure, the reinforcing frame is formed of a thermoplastic material similar to the interior panel material, so that the interior panel and the reinforcing frame can be joined by vibration welding, An object of the present invention is to provide an automobile airbag device that facilitates assembling and does not require a separation operation at the time of recycling.
[0012]
Furthermore, by providing a protrusion suppressing piece protruding inwardly in the upper part corresponding to the edge reinforcing part of the front and rear side walls of the reinforcing frame, the inflation pressure applied to the hinge part of the break open part when the airbag is inflated and deployed. It is an object of the present invention to reduce the size of the rupture opening and to prevent the sacrificial phenomenon occurring on the fracture surface of the fracture opening.
[0013]
[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. In the automotive airbag device provided with the above, a horizontal section having front and rear side walls and left and right side walls of a separate structure is formed in a rectangular cylindrical shape on the back side corresponding to the opening peripheral region of the breaking open portion. A reinforcing frame is provided, and an edge reinforcing portion for reinforcing the back surface corresponding to the opening peripheral region of the break open portion formed on the upper outer periphery of the reinforcing frame is subjected to vibration welding to the back surface of the interior panel. Characterized in that attached Ri.
According to a second aspect of the present invention, in the airbag device for an automobile according to the first aspect, the reinforcing frame includes a protruding suppressing piece protruding corresponding to an upper inner surface side of front and rear side walls, and In a state in which the edge reinforcing portion of the reinforcing frame is welded to the rear surface of the interior panel, a gap is provided between the protrusion suppressing piece and the rear surface of the break open portion, and an intermediate portion between the front and rear side walls is provided. A locking portion for locking the airbag case is formed.
According to a third aspect of the present invention, in the airbag device for an automobile according to the first or second aspect, the reinforcing frame is formed of a thermoplastic plastic material similar to the interior panel.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a vehicle airbag device according to the present invention will be described with reference to the drawings.
FIG. 3 is a longitudinal sectional view of a main part when the vehicle airbag device according to the present invention is applied to a passenger seat, and FIG. 4 is an overall perspective view of the reinforcing frame body in FIG.
[0014]
In FIG. 3, 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.
[0015]
As shown in FIG. 3, a housing portion 42 for housing the airbag device 41 for a vehicle is formed at an inner portion of the left side of the interior panel 40 facing the passenger seat (corresponding to a right-hand drive vehicle). In the case of a left-hand drive vehicle, it is provided on the right side opposite to the above configuration.
[0016]
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. And a reinforcing frame 45 formed using the same type of thermoplastic resin material.
[0017]
The reinforcing frame 45 is formed separately from the interior panel 40, and its form corresponds to the break open portion 51 by front and rear side walls 46 a and 46 b and left and right side walls 46 c and 46 d. The reinforcing frame body 45 is formed in a rectangular cylindrical shape, and an edge reinforcing portion 48 for an opening edge of the break open portion 51 is provided on an upper outer periphery of the rectangular cylindrical shape of the reinforcing frame body 45. A protrusion suppressing piece 46 is formed to protrude toward the inner side of the opposing side wall 46a46b. The protrusion restricting piece 46 is separated from the left and right inner wall surfaces 46c and 46d by notches.
On the upper surface of the edge reinforcing portion 48, a projection portion 50 for wearing for vibration protruding in a streak is formed, and is welded to the back surface of the interior panel.
Further, the pair of oppositely disposed protrusion suppressing pieces 46 are for reducing the inflation pressure applied to the hinge portion 49 of the break open portion when the air bag 43 is inflated and deployed.
[0018]
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 reinforcing frame 45, and hook portions 54 attached to the front and rear side walls of the airbag case 44 are engaged. It has been stopped.
[0019]
The reinforcing frame 45 is integrally formed by injection molding with a low elasticity thermoplastic resin material such as an olefin elastomer.
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.
[0020]
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 formed by forming into a rectangular shape by laser processing or the like. In the short direction of the breaking open portion 51, that is, in the middle of the side breaking groove 40c, a central breaking groove 40b extending over the entire length of the breaking open portion 51 in the long direction is formed by laser processing or the like. When the opening is expanded, the break opening portion 51 is broken from the side break groove 40c and the center break groove 40b, so that the break open portion 51 is unfolded through the hinges 52, 52 of the hinge groove 40a. It is configured to be separated into break open portions 51a and 51b.
[0021]
A plurality of square hole-shaped locking portions 53 are formed on the front and rear side walls 46 a and 46 b in the longitudinal direction of the reinforcing frame 45, and hook portions 54 attached to the front and rear side walls of the airbag case 44. Are locked. 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 air bag 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.
[0022]
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.
[0023]
When the airbag 43 is inflated and deployed, the inflation pressure of the airbag 43 generated on the back surface side of the rupture opening portion 51 at the initial stage of the inflation and deployment of the airbag 43 is alleviated to a small degree by the protrusion suppressing piece 46 of the reinforcing frame 45, and the rupture opening is achieved. By absorbing the impact pressure applied to the hinge portions 49 of the portions 51a and 51b, the expansion of the opening peripheral edge of the interior panel 40 is reduced to prevent cracking, and the break open portions 51a and 51b are formed in the central break groove 40b. The fragile portion is sequentially broken along the fragile portion of the side break groove 40c.
Further, it is possible to absorb an excessive pressure applied to the welded portion between the edge reinforcing portion 48 of the reinforcing frame 45 and the interior panel 40, and it is possible to prevent the damage generated on the peripheral edge of the opening of the interior panel 40.
[0024]
Furthermore, since the peripheral area of the opening of the break open portion 51 is reinforced by the edge reinforcing portion 48 and the protrusion suppressing piece 46 of the reinforcing frame 45, the pressing force from above the interior panel 40 including the break open portion 51 is not applied. The pressure resistance is increased, and it is possible to prevent the interior panel 40 from being deformed such as cracking or distortion when the airbag device is not used.
[0025]
Furthermore, in the above-described embodiment, the configuration is such that the protruding suppressing pieces 46 are provided to protrude toward the upper inner surfaces of the front and rear side walls 46 a and 46 b of the reinforcing frame 45. It is of course possible to provide a simple configuration in which the protrusion suppressing pieces 46 are not provided.
[0026]
Further, 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 reinforcement of the edge reinforcing portion 48 of the reinforcing frame 45 corresponding to the interior panel 40. Since the protruding portions 50 of the tear streaks are provided on the surface, when performing vibration welding, the welding operation is easy without causing deformation of the welded portions due to heat.
[0027]
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.
[0028]
Further, in the above-described embodiment, the configuration in which the central portion in the longitudinal direction of the break open portion 51 is opened in a double door is described. However, the present invention is not limited to this. Of course, it is also applicable.
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.
[0029]
【The invention's effect】
According to the automotive airbag device configured as described above, the horizontal section having the front and rear side walls and the left and right side walls of the separate structure is rectangular on the back side corresponding to the opening peripheral area of the break open portion. A reinforcing frame formed in a tubular shape is provided, and an edge reinforcing portion formed on an outer periphery of an upper portion of the reinforcing frame and reinforcing a back surface corresponding to an opening peripheral region of the break open portion is vibrated on a back surface of the interior panel. Since it is configured to be attached by welding, it is possible to improve the pressure resistance against a pressing load from outside to the broken open portion of the interior panel and the vicinity of the outer periphery of the opening.
[0030]
Further, by forming a reinforcing frame body having an edge reinforcing portion for reinforcing the outer periphery of the outer periphery of the break open portion of the interior panel with a thermoplastic plastic material similar to the interior panel material, the joining between the interior panel and the reinforcing frame body is performed. Can be performed by vibration welding, the configuration is simple, the assembling is easy, and the separation work at the time of recycling can be eliminated.
[0031]
Furthermore, since the interior panel and the reinforcing frame body, which were conventionally integrally molded, are molded as separate bodies and are welded to each other, sink marks and the like generated at the time of molding on the surface side of the interior panel can be prevented. Appearance is improved, and as a result, product yield is improved.
[0032]
In addition, since the protruding restraining piece protruding inward in the upper part of the reinforcing frame is provided, the inflation pressure of the airbag applied to the hinge portion of the break open portion can be reduced to a small degree at the beginning of the inflation of the airbag in the operation of the airbag device. Therefore, cracks generated at the corners of the edges of the break opening of the interior panel can be prevented, and problems such as scattering can be prevented.
[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 a longitudinal sectional view of a main part showing an embodiment in which the vehicle airbag device according to the present invention is applied to a passenger seat.
FIG. 4 is an overall perspective view of a reinforcing frame body in FIG. 3;
[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 Projection Suppression Pieces 47a, 47b Break Reinforcement 48 Edge Reinforcement Part 49 Hinge part 50 Protrusion part 51 Break open part 53 Square hole shaped locking part 54 Hook part

Claims (3)

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を備えた自動車用エアーバッグ装置において、
前記破断開放部の開口周辺領域に対応する裏面側に、別体構成の前,後側壁と左,右側壁を有する水平断面が矩形筒状に形成された補強枠体を配設し、該補強枠体の上部外周に形成した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を前記内装パネルの裏面に振動溶着により取付けたことを特徴とする自動車用エアーバッグ装置。
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. An airbag device for an automobile having a rupture opening portion formed by forming a rupture groove that determines an opening shape for airbag deployment on the back surface of the interior panel.
A reinforcing frame body having a rectangular cross section with a horizontal section having front and rear side walls and left and right side walls of a separate structure is disposed on a back surface side corresponding to the opening peripheral region of the break open portion. An automobile airbag device, wherein an edge reinforcement portion for reinforcing a back surface corresponding to an opening peripheral region of the break open portion formed on an upper outer periphery of a frame body is attached to a back surface of the interior panel by vibration welding.
前記補強枠体は、前,後側壁の上部内面側に対応して突出させた突出抑制片を設けると共に、前記補強枠体の前記縁補強部が内装パネル裏面に溶着された状態で、前記突出抑制片と前記破断開放部裏面との間に隙間を持たせるようにし、かつ前,後側壁の中間部には前記エアーバッグケースを係止する係止部を形成したことを特徴とする請求項1記載の自動車用エアーバッグ装置。The reinforcing frame is provided with protrusion suppressing pieces protruding corresponding to the upper inner surface sides of the front and rear side walls, and the protrusion is formed in a state where the edge reinforcing portion of the reinforcing frame is welded to the back surface of the interior panel. A gap is provided between the restraining piece and the rear surface of the breaking open portion, and a locking portion for locking the airbag case is formed at an intermediate portion between the front and rear side walls. 2. The airbag device for an automobile according to 1. 前記補強枠体は、前記内装パネルと同系の熱可塑性プラスチック材料で形成したことを特徴とする請求項1又は2記載の自動車用エアーバッグ装置。3. The airbag device for an automobile according to claim 1, wherein the reinforcing frame is formed of a thermoplastic material similar to the interior panel.
JP2003152942A 2003-05-29 2003-05-29 Air bag device for automobile Pending JP2004352106A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005238938A (en) * 2004-02-25 2005-09-08 Sanko Gosei Ltd Automobile airbag unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005238938A (en) * 2004-02-25 2005-09-08 Sanko Gosei Ltd Automobile airbag unit

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