JP2004352104A - Air bag device for automobile - Google Patents

Air bag device for automobile Download PDF

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Publication number
JP2004352104A
JP2004352104A JP2003152940A JP2003152940A JP2004352104A JP 2004352104 A JP2004352104 A JP 2004352104A JP 2003152940 A JP2003152940 A JP 2003152940A JP 2003152940 A JP2003152940 A JP 2003152940A JP 2004352104 A JP2004352104 A JP 2004352104A
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JP
Japan
Prior art keywords
reinforcing
break
airbag
interior panel
opening
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
JP2003152940A
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Japanese (ja)
Inventor
Mitsuo Yasuda
満雄 安田
Atsushi Kaneko
篤 金子
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 JP2003152940A priority Critical patent/JP2004352104A/en
Publication of JP2004352104A publication Critical patent/JP2004352104A/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: A reinforcing frame 45 in the air bag device for the automobile comprises: a frame body 46 equipped with a locking section for connecting an air bag case 44; burst reinforcing sections 47a and 47b for a burst opening part integrally molded in the upper part of the frame body; and an edge reinforcing section 48 for reinforcing the back surface corresponding to an opening peripheral region of the burst opening part 51. The frame body is formed in a rectangular shape. The upper periphery of the rectangular shape is provided with the edge reinforcing section 48 extending substantially horizontally in the angle enlarging direction. The burst reinforcing sections 47a and 47b branch inward via hinge extending margins 49 formed of a wave-like bent portion having a notch 49a and reinforcing ribs 49b and 49c disposed at a predetermined interval in the longitudinal direction continuing from the base of the edge reinforcing section. <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。
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、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。
【0008】
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。
【0009】
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裏面に溶着される破断補強部と、破断開放部の外周囲の裏面を補強する縁補強部と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、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。
【0010】
また、前記補強枠体は、エアーバッグケース取付け用の係止部を備えた枠本体と、該枠本体と一体形成の破断補強部と縁補強部とから構成し、枠本体の下部は、前記エアーバッグケース取付用の角穴状の係止部を有する前,後側壁と、短尺方向となる左,右側壁とによって矩形筒状に形成されると共に、前記枠体の矩形状の上部には、拡角方向の傾斜面を介してほぼ水平となる縁補強部を、また、前,後側壁の上部には、それぞれ前記縁補強部の基部より分岐し波状の折曲部からなるヒンジ伸び代部を介して破断補強部を設け、前記ヒンジ伸び代部には長手方向に所定間隔で形成した切込部及び補強リブの両方又はいずれか片方のとなる少なくとも一方を配設すると共に、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することで、破断開口部縁の割れを防止すると共に、前記枠本体及び一体成形された破断補強部及び縁補強部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形成し、ヒンジ伸び代部を確実に確保でき、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、破断開放部の開放をスムーズにし、前記内装パネルの裏面との振動溶着の取付け作業を容易に行えるようにし、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であって、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され、前記枠本体の矩形状の上部周囲には、拡角方向にほぼ水平に延出する縁補強部と、前記縁補強部の基部より分岐し波状の折曲部からなるヒンジ伸び代部を介して破断補強部とを設け、前記ヒンジ伸び代部には長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設すると共に、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。
【0012】
請求項2の発明は、請求項1記載の自動車用エアーバッグ装置において、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は、平面長方形状を呈する片側開放式の破断開放部であって、前記枠本体の矩形状の上部周囲には、拡角方向に分岐されたほぼ水平に延出する縁補強部を、また前記前,後側壁のいずれか一方の前記縁補強部の基部からは波状の折曲部からなるヒンジ伸び代部を介して破断補強部を設け、前記ヒンジ伸び代部には前記長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設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、前記破断開放部は、平面長方形状を呈する長手方向中央部が切断される両開き方式の破断開放部であって、前記枠本体の矩形筒状の上部周囲には、拡角方向に分岐されたほぼ水平に延出する縁補強部と、前記縁補強部の基部より分岐し波状の折曲部からなるヒンジ伸び代部を介して中央部分で夫々が対峙する一対の破断補強部とを設け、前記ヒンジ伸び代部には長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設すると共に、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したことを特徴とする。
【0014】
請求項4の発明は、請求項1〜3のいずれか1つに記載の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。
【0015】
請求項5の発明は、請求項1〜4のいずれか1つに記載の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。
【0016】
請求項6の発明は、請求項1〜5のいずれか1つに記載の自動車用エアーバッグ装置において、前記枠本体の前,後側壁には前記エアーバッグケースのエアーバッグが展開作動時に連結するフック部が挿入する角穴状の係止部が対応してそれぞれ形成されていることを特徴とする。
【0017】
請求項7の発明は、請求項1〜6のいずれか1つに記載の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。
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、図5の(a),(b)は図4のB−B線,C−C線に沿った断面図、図6は図3の動作説明図である。
【0019】
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。
【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。
【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、さらに前記波状のヒンジ伸び代部49の山部には長手方向に直交して谷部側に所定の間隔で上下方向に切り込んだ複数の切込部49aが形成されると共に、前記ヒンジ伸び代部49の前記傾斜面46eに対応する外面側と前記破断補強部47a,47bに対向する内面側との間に、所定の間隔で離間して複数の補強リブ49bが設けられ、さらに前記伸び代部49の内面側となる破断補強部47a,47bと連続面補強リブ49cが設けられた構成となっている。なお、この補強リブ49cの長手方向厚さは,破断補強部47a,47bの上下方向厚さより薄く形成されたもので、破断開放部51a,51bの開放展開に伴って展開する破断補強部47a,47bの展開時には、ヒンジ伸び代部49の急激な伸びを規制するが、展開後半には切断されるようになっている。
【0023】
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。
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。
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。
【0024】
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、図6に示すようにヒンジ溝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。
【0025】
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。
【0026】
前記補強枠体45に一体成形された破断補強部47a,47bは、長手方向に所定の間隔で設けた複数の切込部49a及び複数の補強リブ49b,49cを有する波状の折曲形状のヒンジ伸び代部49を介して、図3に示すように、補強枠体45の内装パネル40側開口を閉鎖する状態から、図6に示すようにエアーバッグ43が膨張展開できる状態に展開できるように破断開放部51a,51bと連結されている。
【0027】
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、破断開放部51a,51bの変形における破断補強部47a,47bの初期の展開圧力を補強リブ49bによって抑制することで、破断開放部の変形を防止し、次にヒンジ伸び代部49に所定間隔で設けた切込部49aによって破断開放部51a,51bの反転を容易にすることで、破断補強部47a,47bの伸びを充分に吸収することが可能となると共に、破断開放部51a,51bのスムーズな展開を図ると共に、補強リブ49cによって前記ヒンジ伸び代部49の急激な伸びを規制することで、破断開放部51a,51bと破断補強部47a,47bとの溶着結合部の剥離や破断を保護することができる。
【0028】
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。
【0029】
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(図6参照)。
【0030】
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、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を介して図6に示すように展開され、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。
【0031】
展開最終段階では前記枠本体46の角穴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、図6に示すようにスムーズに観音開き状態に外側へ展開される。
【0032】
以上のように、前記実施形態においては、補強枠体45を、枠本体46と一体成形した縁補強部48と破断補強部47a,47bとから構成し、枠本体46の前,後側壁46a,46bに互いに内方中央部で対峙する一対の破断補強部47a,47bを所定間隔で切込部49aと補強リブ49b,49cとを備えた波状の折曲部を有するヒンジ伸び代部49を介して形成し、前記破断補強部47a,47bを破断開放部51a,51bの裏面に振動溶着した構成としたので、破断補強部47a,47bの反転に伴うヒンジ伸び代部49を確保できるため、前,後の破断開放部51a,51bと破断補強部47a,47bの水平部との溶着部に与える衝撃力を解消できる。
【0033】
さらに、この実施の形態によれば、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。
【0034】
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。
【0035】
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である。
【0036】
さらにまた、前記実施形態によれば、図4に示すように、ヒンジ伸び代部49の長手方向に所定の間隔で、複数の切込部49a及び折曲げ山部の両側に配設した補強リブ49b,49cを設けた構成としたが、必ずしもこれら切込部49a及び補強リブ49b,49cの両方を設ける必要がなく、図7,図8のようにいずれか一方のみを設けた構成としても良いことは勿論である。
【0037】
即ち、図7は、ヒンジ伸び代部49の長手方向に所定の間隔で、複数の切込部49aのみを配設した構成であり、その他については前記実施形態と同様なので、同一部分には同一符号を付して,構成の詳細は省略する。
ヒンジ伸び代部49の長手方向に所定の間隔で、複数の切込部49aを設けることで、ヒンジ部の変形を抑制して破断開放部の破断面にシャープなエッジなどの生じることを防止して、綺麗な破断面とすることができる効果がある。
【0038】
図8は、ヒンジ伸び代部49の長手方向に複数の折曲げ山部を挟んで両側に補強リブ49b,49cを配設した構成であり、その他については前記実施形態と同様なので、同一部分には同一符号を付して,構成の詳細は省略する。
ヒンジ伸び代部49の長手方向に複数の折曲げ山部を挟んで両側に補強リブ49b,49cを配設した構成とすることで、エアーバッグの膨張展開時に、破断開放部のヒンジ部が先に伸びて、内装パネルのヒンジ部側端が破断開口より外側へ移動して引き裂きなどを防止し、破断開放部の開口展開をスムーズにする効果がある。
【0039】
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。
【0040】
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。
【0041】
さらに、前述の実施形態においては破断開放部が観音開き形式のものについて説明したが、これに限定されることなく、前記内装パネルに形成される破断開放部は、平面長方形状を呈する片側開放式の破断開放部であってもよく、前記枠本体の矩形状の上部周囲には、拡角方向に分岐されたほぼ水平に延出する縁補強部を、また前記前,後側壁のいずれか一方の前記縁補強部の基部からは、長手方向に所定間隔で設けた切込部及び補強リブを有する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た構成としても良いことは勿論である。
【0042】
【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され、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と、前記縁補強部の基部より分岐し波状の折曲部からなるヒンジ伸び代部を介して破断補強部を設け、前記ヒンジ伸び代部には長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設すると共に、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構成したので、破断開口部縁の割れを防止すると共に、前記枠本体及び一体成形された破断補強部及び縁補強部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形成し、ヒンジ伸び代部を確実に確保でき、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、破断開放部の開放をスムーズにし、前記内装パネルの裏面との振動溶着の取付け作業を容易に行えるようにし、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できる。
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。
【0043】
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。
【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。
【図5】(a),(b)はそれぞれ、本発明にかかる図4の補強枠体におけるB−B線及びC−C線の断面斜視図。
【図6】図3の作動状態を示す説明用断面図。
【図7】本発明の補強枠体の変形例を示す図4相当図。
【図8】本発明の補強枠体のさらに異なる変形例を示す図4相当図。
【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
49a 切込部
49b,49c 補強リブ
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]
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.
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. And the front and rear walls of the frame-shaped reinforcing attachment portion 16 integrally formed on the back surface of the interior panel 10 and the hook portion 17 attached to the front and rear wall surfaces 13b, 13b of the case 13. By doing so, the rupture opening portion 14 of the interior panel 10 that has been 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 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-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. The backlash 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 hinge grooves are provided. 10a, 10a, the center breaking groove 10b, and the breaking grooves 10c, 10c are broken or the like. There is a problem that is Nawa.
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 pushed outward, and cracks occur at the corners of the rim of the opening of the interior panel 10, causing problems such as scattering. Conceivable.
[0008]
On the back surface of the break open portion 14 of the interior panel 10, reinforcing plate members 11, 11 extending in the front-rear direction of the break open portion 14 with the central break groove 10b interposed therebetween are fixed by welding. , 11 are made of a metal plate. When the air bag is inflated and deployed, the metal reinforcement plate 11, 11 is exposed when the break open portion 14 is inverted, and there is a problem in safety. When separating the reinforcing plate members 11, 11 formed of metal plate members 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. .
[0009]
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. In addition to being able to improve the pressure resistance against a pressing load from the outside to the vicinity of the outer peripheral edge of the opening, a break reinforcing portion welded to the back surface of the break open portion of the interior panel, and a back surface around the break open portion Frame is formed of a thermoplastic material similar to the interior panel material, and the interior panel and the reinforcement frame can be joined by vibration welding, facilitating assembly. Another object of the present invention is to provide an airbag device for an automobile which does not require a separation operation at the time of recycling.
[0010]
Further, the reinforcing frame body includes a frame body having a locking portion for mounting an airbag case, a break reinforcing portion and an edge reinforcing portion integrally formed with the frame body, and a lower portion of the frame body includes A rectangular tube is formed by front and rear side walls having rectangular hole-shaped locking portions for mounting an airbag case, and left and right side walls which are short length directions. An edge reinforcing portion which is substantially horizontal via the inclined surface in the direction of the widening angle, and a hinge extension allowance formed on the front and rear side walls of the upper portion of each of the edge reinforcing portions, the hinge extending from a base portion of the edge reinforcing portion. A break reinforcing portion is provided through the portion, and at least one of a cut portion and / or a reinforcing rib formed at a predetermined interval in the longitudinal direction is provided in the hinge extension portion and the frame is provided. The break reinforcing portion and the edge reinforcing portion integrally formed with the main body are attached to the interior panel. By vibration welding to the back surface of the frame, the cracks at the edges of the fracture opening are prevented, and the frame main body and the integrally formed fracture reinforcement and edge reinforcement are made of a low-elastic thermoplastic resin material such as an olefin-based elastomer. By forming, the hinge extension allowance can be reliably ensured, and the developing pressure applied to the break open portion and the area around the break is absorbed, the break open portion is opened smoothly, and the vibration welding with the back surface of the interior panel is attached. It is an object of the present invention to provide an airbag device for an automobile that enables easy operation, prevents a sharp edge from being generated in a fractured surface, and prevents a break-up phenomenon from occurring in a fractured portion, and enables a clean fractured 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. An airbag device for a vehicle, comprising: a reinforcing frame body 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 connecting the air bag case. A frame body provided with a locking portion for connecting the airbag case, a break reinforcing portion for the break open portion integrally formed on an upper portion of the frame body, and 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 the frame main body has a rectangular shape. Around the upper part, an edge reinforcement portion extending substantially horizontally in the direction of widening, and a break reinforcement portion provided via a hinge extension portion that is branched from a base portion of the edge reinforcement portion and formed of a wavy bent portion are provided. The hinge extension is provided with at least one of a cut portion and a reinforcing rib formed at a predetermined interval in a longitudinal direction, and a break reinforcing portion and an edge reinforcing portion integrally formed with the frame main body are attached to the interior panel. Is fixed to the back surface by vibration welding.
[0012]
According to a second aspect of the present invention, in the automotive airbag device according to the first aspect, 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 substantially rectangular opening of the frame body, around the rectangular upper portion of the frame main body, a substantially horizontally extending edge reinforcing portion branched in a widening direction; A fracture reinforcing portion is provided from a base portion of the edge reinforcing portion on one of the rear side walls through a hinge extension portion formed of a wavy bent portion, and the hinge extension portion is formed at a predetermined interval in the longitudinal direction. At least one of the cut portion and the reinforcing rib is provided.
[0013]
According to a third aspect of the present invention, in the vehicle airbag device according to the first aspect, the break opening portion is a double opening break opening portion in which a central portion in a longitudinal direction having a flat rectangular shape is cut. Around the upper portion of the rectangular cylindrical shape of the frame body, an edge reinforcement portion that is branched in the widening direction and extends substantially horizontally, and a hinge extension portion that includes a wavy bent portion that branches off from the base of the edge reinforcement portion. A pair of break reinforcing portions each facing each other at a central portion via a, and at least one of a notch portion and a reinforcing rib formed at predetermined intervals in the longitudinal direction are arranged in the hinge extension portion, and The fracture reinforcing portion and the edge reinforcing portion integrally formed with the frame body are vibration-welded to the back surface of the interior panel.
[0014]
According to a fourth aspect of the present invention, there is provided the airbag device for an automobile according to any one of the first to third aspects, wherein the frame body and the integrally formed 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.
[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, a predetermined surface is provided on each of the fracture 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.
[0016]
According to a sixth aspect of the present invention, in the airbag device for an automobile according to any one of the first to fifth aspects, the airbag of the airbag case is connected to the front and rear side walls of the frame main body at the time of deployment operation. It is characterized in that square hole-shaped locking portions to be inserted by the hook portions are respectively formed correspondingly.
[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 sixth 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.
It is characterized by having done.
[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. 3 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. 4 is an overall perspective view of a reinforcing frame body in FIG. 3, and FIGS. ) Is a cross-sectional view along the line BB and CC of FIG. 4, and FIG. 6 is an operation explanatory view of FIG.
[0019]
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.
[0020]
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.
[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 formed continuously and inwardly corresponding to each other are formed via a hinge extension portion 49 bent in a wavy manner, and further formed on the peak portion of the wavy hinge extension portion 49. Are formed with a plurality of cuts 49a cut in the vertical direction at predetermined intervals on the valley side perpendicular to the longitudinal direction, and the outer side corresponding to the inclined surface 46e of the hinge extension allowance 49 and the notch 49a. Break reinforcing portions 47a, 47 A plurality of reinforcing ribs 49b are provided at a predetermined interval between the reinforcing ribs 49b and the inner surface of the extending portion 49a. The configuration is provided. The thickness of the reinforcing rib 49c in the longitudinal direction is formed to be thinner than the vertical thickness of the rupture reinforcing portions 47a, 47b. When the 47b is deployed, the hinge extension 49 is restricted from abrupt extension, but is cut off in the latter half of the deployment.
[0023]
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.
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.
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.
[0024]
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, whereby FIG. As shown in FIG. 5, before being developed into a double-open state via hinges 52, 52 constituted by hinge grooves 40a, the hinges are separated into break open portions 51a, 51b. To have.
[0025]
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.
[0026]
The breaking reinforcing portions 47a and 47b integrally formed with the reinforcing frame 45 are provided with a plurality of notches 49a and a plurality of reinforcing ribs 49b and 49c provided at predetermined intervals in a longitudinal direction, and have a wavy bent hinge. As shown in FIG. 3, the airbag 43 can be deployed from the state in which the opening on the interior panel 40 side of the reinforcing frame body 45 is closed to the state in which the airbag 43 can be inflated and deployed as shown in FIG. It is connected to the break open parts 51a and 51b.
[0027]
In the embodiment of the present invention, since the reinforcing frame 45 and the break reinforcing portions 47a, 47b are integrally formed, the break reinforcing portions 47a, 47b in the deformation of the break open portions 51a, 51b during inflation and deployment of the airbag. By suppressing the initial deployment pressure of 47b by the reinforcing rib 49b, the deformation of the break open portion is prevented, and the break open portions 51a, 51b are cut by the cut portions 49a provided at predetermined intervals in the hinge extension portion 49. By facilitating the reversal, it is possible to sufficiently absorb the elongation of the fracture reinforcing portions 47a and 47b, to achieve smooth expansion of the fracture opening portions 51a and 51b, and to increase the hinge elongation allowance by the reinforcement rib 49c. By controlling the rapid elongation of the portion 49, the peeling or breakage of the welded joint between the break open portions 51a, 51b and the break reinforcing portions 47a, 47b is maintained. It can be.
[0028]
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.
[0029]
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. In response to this signal, a known inflator (not shown) is operated to generate a predetermined gas, and this gas is supplied to the air bag 43, whereby the air bag 43 is rapidly inflated and deployed (see FIG. 6).
[0030]
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 break reinforcing portions 47a and 47b and the inside of the reinforcing frame 45, the frame body 46 and the edge reinforcing portion 48 are opened. Since the connection is made at an angle that expands to the side, the effect of expansion on the reinforcing frame 45 is small, and furthermore, the opening peripheral edge of the interior panel 40 is reduced in order to pull the edge reinforcing portion 48 inward and downward, and cracks are generated. At the same time, the break open portions 51a, 51b welded to the horizontal plane of the break reinforcing portions 47a, 47b are sequentially broken along the weak portion of the center break groove 40b along the weak portion of the side break groove 40c. The horizontal portions of the breaking reinforcing portions 47a and 47b including the breaking open portions 51a and 51b before and after this are shown in FIG. 6 through hinge extension portions 49 having wavy bent portions. It can be expanded to absorb excessive pressure resistance applied to the welded portion between the fracture-opening section 51 breaks the reinforcement portion 47a, and 47b on.
[0031]
In the final stage of deployment, the pressure can be absorbed also by the gap of the square hole 53 of the frame body 46, so that damage occurring at the opening edge of the interior panel 40 can be prevented, and as shown in FIG. Be expanded.
[0032]
As described above, in the above-described embodiment, the reinforcing frame body 45 is constituted by the edge reinforcing portion 48 integrally formed with the frame main body 46 and the breaking reinforcing portions 47a and 47b, and the front and rear side walls 46a and 46a of the frame main body 46 are formed. A pair of break reinforcing portions 47a, 47b opposed to each other at an inner central portion of 46b via a hinge extension portion 49 having a wavy bent portion provided with cut portions 49a and reinforcing ribs 49b, 49c at predetermined intervals. Since the fracture reinforcing portions 47a and 47b are vibration-welded to the back surfaces of the fracture opening portions 51a and 51b, the hinge extension portion 49 accompanying the reversal of the fracture reinforcing portions 47a and 47b can be secured. The impact force applied to the welded portion between the break opening portions 51a and 51b and the horizontal portions of the break reinforcing portions 47a and 47b can be eliminated.
[0033]
Furthermore, according to this embodiment, since the opening peripheral areas around the front, rear, left and right of the break opening 51 are welded to the edge reinforcing portion 48 of the reinforcing frame 45, the opening operation of the break opening 51 is performed. Follow-up is suppressed, so that the airbag 43 is rapidly broken at the break groove 46c, and a sharp edge is formed on the broken surface of the break open portions 51a, 51b broken at the time of inflation and deployment of the airbag 43, or a sharp edge is formed at the break portion. It is possible to prevent the occurrence of a scuffing phenomenon and provide a clean fracture surface.
[0034]
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.
[0035]
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 through the projections 50 of the tear streaks, so that the welding operation is easy without causing deformation of the welded portions due to heat.
[0036]
Furthermore, according to the embodiment, as shown in FIG. 4, the reinforcing ribs disposed on both sides of the plurality of cuts 49 a and the bent ridges at predetermined intervals in the longitudinal direction of the hinge extension 49. Although the structure provided with 49b and 49c is provided, it is not always necessary to provide both the cut portion 49a and the reinforcing ribs 49b and 49c, and a structure provided with only one of them as shown in FIGS. Of course.
[0037]
That is, FIG. 7 shows a configuration in which only a plurality of cut portions 49a are provided at predetermined intervals in the longitudinal direction of the hinge extension allowance portion 49, and the other portions are the same as in the above-described embodiment. Reference numerals are used, and details of the configuration are omitted.
By providing a plurality of cut portions 49a at predetermined intervals in the longitudinal direction of the hinge extension 49, deformation of the hinge portion is suppressed, and sharp edges or the like are prevented from being generated in the fracture surface of the break open portion. Therefore, there is an effect that a beautiful fracture surface can be obtained.
[0038]
FIG. 8 shows a configuration in which reinforcing ribs 49b and 49c are provided on both sides of a plurality of bent ridges in the longitudinal direction of the hinge extension 49, and the other portions are the same as those in the above embodiment. Are denoted by the same reference numerals, and the details of the configuration are omitted.
The reinforcing ribs 49b and 49c are arranged on both sides of the hinge extension portion 49 in the longitudinal direction with a plurality of bent ridges interposed therebetween, so that when the airbag is inflated and deployed, the hinge portion of the break open portion comes first. The hinge portion side end of the interior panel moves outside the break opening to prevent tearing and the like, and has an effect of smoothing the opening of the break open portion.
[0039]
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.
[0040]
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 side of the interior panel 40. However, the present invention is not limited to this. Of course, it can also be formed by die processing, and in the case of milling groove processing, cut from the back side of the interior panel and leave the thickness of the front side of the interior panel in the range of 0.5 mm to 0.8 mm. Should be provided. In addition, there is a method of integrally molding the front panel at the time of molding.
[0041]
Further, in the above-described embodiment, the break opening portion has been described as a double-opening type, but is not limited thereto, and the break opening portion formed in the interior panel is a one-side open type having a flat rectangular shape. A break open portion may be provided, and a substantially horizontal edge reinforcing portion branched in a widening direction is provided around a rectangular upper portion of the frame body, and one of the front and rear side walls is provided. From the base of the edge reinforcing portion, a break reinforcing portion branching inward was formed through a hinge extension portion formed of a wavy bent portion having a cut portion and a reinforcing rib provided at predetermined intervals in a longitudinal direction. Needless to say, a configuration may be employed.
[0042]
【The invention's effect】
According to the airbag device for an automobile configured as described above, the reinforcing frame body is provided with a frame main body having a locking portion for connecting the airbag case, and a rupture integrally formed on an upper portion of the frame main body. A break reinforcement portion for an open portion and an edge reinforcement portion for reinforcing a back surface corresponding to an opening peripheral region of the break open portion, and a lower portion of the frame body includes front and rear side walls and left and right side walls. Around the upper portion of the rectangular cylindrical shape of the frame main body, an edge reinforcing portion extending substantially horizontally in the direction of widening, and a wavy bent portion branched from the base of the edge reinforcing portion. A break reinforcement portion is provided via a hinge extension portion comprising: a notch portion and a reinforcement rib formed at predetermined intervals in the longitudinal direction at the hinge extension portion, and are integrated with the frame body. The molded break reinforcing portion and the edge reinforcing portion are connected to the interior panel. It is configured to be fixed to the back surface by vibration welding, so that cracks at the rupture opening edge are prevented, and the frame main body and the integrally formed rupture reinforcement and edge reinforcement are made of an olefin-based elastomer and the like. Formed by a thermoplastic resin material, the hinge extension allowance can be reliably ensured, and the developing pressure applied to the break open portion and the opening peripheral area is absorbed, the break open portion is smoothly opened, and the back surface of the interior panel and An airbag device for automobiles that makes it easy to perform the vibration welding attachment work, prevents sharp edges on the fractured surface, and prevents the breakage portion from being crushed, and can produce a clean fractured surface Can be provided.
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.
[0043]
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.
[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;
5 (a) and 5 (b) are cross-sectional perspective views taken along line BB and line CC in the reinforcing frame of FIG. 4 according to the present invention.
FIG. 6 is an explanatory sectional view showing the operation state of FIG. 3;
FIG. 7 is a view corresponding to FIG. 4, showing a modification of the reinforcing frame of the present invention.
FIG. 8 is a view corresponding to FIG. 4, showing still another modified example of the reinforcing frame body of the present invention.
[Explanation of symbols]
40 Interior Panel 40a Hinge Groove 40b Center Breaking Groove 40c Side Breaking 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 49a Cuts 49b, 49c Reinforcement rib 50 Projection 51 Break open part 53 Square hole-shaped locking part 54 Hook part

Claims (7)

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であって、
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され、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と、前記縁補強部の基部より分岐し波状の折曲部からなるヒンジ伸び代部を介して破断補強部を設け、前記ヒンジ伸び代部には長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設すると共に、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. 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. A vehicle airbag device for reinforcing, comprising a reinforcing frame connecting the airbag case,
A frame body provided with a locking portion for connecting the airbag case to the reinforcing frame, a break reinforcing portion integrally formed on an upper portion of the frame body for a break opening portion, and a periphery of an opening of the break open portion; The frame main body is formed by a front and rear side wall and left and right side walls, and the lower part of the frame main body is formed in a rectangular cylindrical shape. Around the upper portion, an edge reinforcement portion extending substantially horizontally in the direction of the angle of expansion, and a fracture reinforcement portion provided via a hinge extension portion that is branched from a base portion of the edge reinforcement portion and formed of a wavy bent portion, At least one of a cut portion and a reinforcing rib formed at a predetermined interval in the longitudinal direction is disposed in the hinge extension portion, and a break reinforcing portion and an edge reinforcing portion integrally formed with the frame body are provided on the back surface of the interior panel. Is fixed by vibration welding. That the air bag system for automobiles.
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は、平面長方形状を呈する片側開放式の破断開放部であって、前記枠本体の矩形状の上部周囲には、拡角方向に分岐されたほぼ水平に延出する縁補強部を、また前記前,後側壁のいずれか一方の前記縁補強部の基部からは波状の折曲部からなるヒンジ伸び代部を介して破断補強部を設け、前記ヒンジ伸び代部には前記長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設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 break open portion formed by forming a break groove for determining an opening shape for airbag deployment on the back surface of the interior panel is a one-side open break open portion having a planar rectangular shape, and the frame body Around the upper part of the rectangular shape, a substantially horizontal edge reinforcing portion branched in the direction of widening and a wavy bent portion from one of the front and rear side walls of the edge reinforcing portion. A break reinforcing portion is provided via a hinge extension portion comprising a portion, and at least one of a cut portion and a reinforcing rib formed at a predetermined interval in the longitudinal direction are provided in the hinge extension portion. The vehicle airbag device according to claim 1. 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は、平面長方形状を呈する長手方向中央部が切断される両開き方式の破断開放部であって、前記枠本体の矩形筒状の上部周囲には、拡角方向に分岐されたほぼ水平に延出する縁補強部と、前記縁補強部の基部より分岐し波状の折曲部からなるヒンジ伸び代部を介して中央部分で夫々が対峙する一対の破断補強部とを設け、前記ヒンジ伸び代部には長手方向に所定間隔で形成した切込部及び補強リブの少なくとも一方を配設すると共に、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したことを特徴とする請求項1に記載の自動車用エアーバッグ装置。A break open portion formed by forming a break groove for determining an opening shape for airbag deployment on the back surface of the interior panel is a double open break open portion in which a longitudinal central portion having a flat rectangular shape is cut. Around the upper portion of the rectangular cylindrical shape of the frame body, a substantially horizontal edge extending portion that is branched in a widening direction, and a wavy bent portion that branches off from the base of the edge reinforcing portion. A pair of break reinforcing portions, each of which is opposed to each other at a central portion via a hinge extending portion, and at least one of a cut portion and a reinforcing rib formed at a predetermined interval in the longitudinal direction are arranged in the hinge extending portion. 2. The airbag device for an automobile according to claim 1, wherein a break reinforcing portion and an edge reinforcing portion integrally formed with the frame body are vibration-welded to a back surface of the interior panel. 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請求項1〜3のいずれか1つに記載の自動車用エアーバッグ装置。The automobile according to any one of claims 1 to 3, 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-based elastomer. Air bag device. 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請求項1〜4のいずれか1項に記載の自動車用エアーバッグ装置。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. 前記枠本体の前,後側壁には前記エアーバッグケースのエアーバッグが展開作動時に連結するフック部が挿入する角穴状の係止部が対応してそれぞれ形成されていることを特徴とする請求項1〜5のいずれか1に記載の自動車用エアーバッグ装置。A square hole-shaped engaging portion into which a hook portion to which the airbag of the airbag case is connected when the airbag is deployed is formed on the front and rear side walls of the frame body, respectively. Item 6. The vehicle airbag device according to any one of Items 1 to 5. 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請求項1〜6のいずれか1つに記載の自動車用エアーバッグ装置。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 6, wherein
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007137244A (en) * 2005-11-17 2007-06-07 Inoac Corp Hinge structure of air bag door

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007137244A (en) * 2005-11-17 2007-06-07 Inoac Corp Hinge structure of air bag door

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