JP3626529B2 - Manufacturing method of airbag device - Google Patents

Manufacturing method of airbag device Download PDF

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Publication number
JP3626529B2
JP3626529B2 JP7634595A JP7634595A JP3626529B2 JP 3626529 B2 JP3626529 B2 JP 3626529B2 JP 7634595 A JP7634595 A JP 7634595A JP 7634595 A JP7634595 A JP 7634595A JP 3626529 B2 JP3626529 B2 JP 3626529B2
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Japan
Prior art keywords
airbag
hole forming
forming member
bag
elements
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JP7634595A
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JPH08268213A (en
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等 樋口
健 甲斐
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23Inflatable members
    • B60R21/239Inflatable members characterised by their venting means

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  • Air Bags (AREA)

Description

【0001】
【産業上の利用分野】
本発明は、ガス排出用ベントホールを有して平時には折り畳み状態に置かれる袋状エアバッグを、乗物の所定の非常事態発生時にインフレータ等のガス発生器から噴出するガスで急激に膨張させることによって、乗員の頭部等を拘束保護できるようにしたエアバッグ装置の製造方法に関する。
【0002】
【従来の技術】
上記エアバッグ装置においてベントホールは、乗員拘束時のエアバッグ内部のガスを適当に逃がすことにより、その内部圧力を調整して乗員を効果的に拘束することを目的として設置される。
【0003】
ところで上記エアバッグ装置において、そのエアバッグ本体にベントホールとなる円孔を単に開けただけでは、その開口縁が、そこから勢いよく噴出するガス圧のために破断する恐れがあり、この問題を解決するために、例えば実公平5−11094号公報に開示される如くエアバッグ本体に、それとは別の丈夫な素材で作られてベントホールを形成するホール形成部材を重合結着することにより、そのベントホール開口縁の必要強度を確保するようにしたものが知られている。
【0004】
【発明が解決しようとする課題】
ところが上記従来装置では、エアバッグ本体とホール形成部材とを別々の工程で個別に製造し、その後に、エアバッグ本体にホール形成部材を結着する必要があり、全体として構造が複雑で製造コストも嵩む問題がある。
【0005】
しかも上記従来装置では、エアバッグの折り畳み格納時よりベントホールが常に開放状態に保たれるので、ガス発生器からバッグ内に供給されるガスの損失が大きくなり、このため、所定のバッグ内圧を得るのに、バッグ容積の割合にガス供給量が非常に大きい、即ち高出力のガス発生器を用いる必要がある。そして、このようなガス発生器の高出力化は、エアバッグ自体の強度は勿論のこと、エアバッグ装置の全体的強度も必要以上に高めなければならず、コスト増や重量増を招く等の問題がある。
【0006】
本発明は斯かる実情に鑑みてなされたもので、従来のものの上記問題を解決することができるエアバッグ装置の製造方法を提供することを目的とする。
【0007】
【課題を解決するための手段】
上記目的を達成するため各請求項の発明は、袋状のエアバッグ本体と、このエアバッグ本体に設けられてガス排出用ベントホールを形成するホール形成部材とを有して平時には折り畳み状態にあるエアバッグを、所定の非常事態発生時にガス発生器から噴出するガスで急激に膨張させるようにしたエアバッグ装置の製造方法において、前記エアバッグ本体が複数個のバッグ本体要素から分割構成されると共に、前記ホール形成部材が少なくとも2個のホール形成要素から分割構成されており、前記少なくとも2個のホール形成要素を少なくとも2個の前記バッグ本体要素の側部にそれぞれ継ぎ目無く一体に形成しておき、前記複数個のバッグ本体要素の周縁部相互をその周縁に沿って縫着して前記エアバッグ本体を成すると共に、前記少なくとも2個のホール形成要素の側縁部相互をその側縁に沿って縫着して、両端が開放したチューブ状の前記ホール形成部材を成すことを特徴とし、また特に請求項2の発明は、前記請求項1に記載された製造方法により製造されたエアバッグ装置であって、チューブ状ホール形成部材が、前記エアバッグの折り畳み状態ではエアバッグ本体の内側に折り返されることを特徴とし、更にまた請求項3の発明は、前記請求項1に記載された製造方法により製造されたエアバッグ装置であって、前記チューブ状ホール形成部材に、それの先端開口縁より長手方向中間部に達する複数条のスリットが形成されることを特徴とする。
【0008】
【作 用】
各請求項の発明の上記特徴によれば、複数個のバッグ本体要素の周縁部相互をその周縁に沿って縫着して袋状のエアバッグ本体を成すると共に、少なくとも2個のバッグ本体要素の側部にそれぞれ継ぎ目無く一体に形成した少なくとも2個のホール形成要素の側縁部相互をその側縁に沿って縫着して、両端が開放したチューブ状のホール形成部材を成することにより、エアバッグ本体とチューブ状のホール形成部材とが相互に一体に形成されるから、ベントホールの必要強度を損なうことなくホール形成部材がエアバッグ本体に一体化され、部品点数の削減や構造の簡略化が図られる。しかもエアバッグ本体とホール形成部材との一体性を損なうことなく、エアバッグ本体及びチューブ状ホール形成部材を各々複数の要素より分割構成することができる。
【0009】
更に請求項2の発明の上記特徴によれば、チューブ状ホール形成部材がエアバッグの折り畳み状態でエアバッグ本体の内側に折り返される。このため、エアバッグの膨張初期にはその内圧が折り返し状態のホール形成部材に作用して同部材をエアバッグ本体内面に強く押し付けるから、ベントホールからのガス洩れが有効に抑えられ、それだけガス発生器の出力(即ちガス供給量)を低減し得る。
【0010】
さらに請求項3の発明の上記特徴によれば、チューブ状ホール形成部材の先部は上記スリットの形成によって複数の乱流板に分割される。そしてこれら乱流板は、エアバッグ膨張過程でベントホールの通過ガス流に乱流を生じさせることにより、該ガス流に対し適度な流動抵抗を与えてバッグ内圧の低下を極力防止し得る。
【0011】
【実施例】
以下、図面を参照して本発明の実施例について説明する。図1は、本発明エアバッグ装置を組み込んだ車室の要部縦断側面図、図2は、第1実施例に係るエアバッグの反転前(縫製直後)の展開状態を示す全体斜視図、図3は、第1実施例に係るエアバッグの反転後の展開状態を示す要部斜視図、図4は、第1実施例に係るエアバッグの膨張過程を説明するための縦断作用図、図5は、第2実施例に係るエアバッグの反転前(縫製直後)の展開状態を示す全体斜視図、図6は、第2実施例に係るエアバッグの膨張過程でのホール形成部材先部の状態を示す説明図である。
【0012】
先ず、図1において、乗物としての自動車Vの車室において、助手席側のダッシュボードパネルP内には、所定形状に折り畳まれたエアバッグAと、このエアバッグAを急激に膨張させるべく該バッグ内にガスを急速に供給し得るインフレータIとをモジュールケースC内に一纏めに収納した、エアバッグ装置としてのエアバッグモジュールMが着脱可能に格納される。前記インフレータIは、本発明のガス発生器を構成するもので、自動車Vの衝突等の非常事態発生を検出し得るセンサ(図示せず)からの検出信号に基づいて作動状態となってエアバッグAを急激に膨張させることができる。尚、斯かるセンサやインフレータIの構造、機能は従来周知であるので、説明を省略する。
【0013】
エアバッグAの左右両側部には左右一対のベントホールHがそれぞれ形成されており、これらベントホールHは、乗員拘束時のエアバッグA内部のガス圧を一定に制御して逃がすことにより乗員を効果的に拘束するために設けられる。尚、図1において、1は平時に折り畳み状態にある前記エアバッグAを体裁よく覆うカバーであり、このカバー1は、エアバッグAの膨張時に該バッグによって容易に破断されてその膨張を無理なく許容する。
図2に示すようにエアバッグAは、袋状のエアバッグ本体2と、このエアバッグ本体2の左右両側部に前記ベントホールHを形成するためのホール形成部材3とを備えている。前記エアバッグ本体2は、可撓性のシート状気密素材よりそれぞれ形成された上下一対のバッグ本体要素2a,2bの相対向する周縁部相互をその周縁に沿うように縫着して、基端(即ち前端)に開口部5を有する袋状に構成される。
【0014】
またその両バッグ本体要素2a,2bの左右両側部には、該バッグ本体要素2a,2bと同一素材でそれぞれ形成された上下一対の帯状ホール形成要素3a,3bがそれぞれ継ぎ目無く一体に連設されており、その各上下一対のホール形成要素3a,3bの前後の側縁部相互はその側縁(従って該要素3a,3bの長手方向)に沿うように縫着される。これにより、その各上下一対のホール形成要素3a,3bによりチューブ状のホール形成部材3が形成され、このホール形成部材3の内周面が、該部材3の長手方向に延びるベントホールHを構成する。
【0015】
前記両バッグ本体要素2a,2bの後半側の周縁部相互を縫着すべくその周縁に沿って延びる後側の本体縫着線2srの左右両端は、左右の各上下ホール形成要素3a,3bの後側縁部相互を縫着すべくその後側縁に沿って延びる左右の後側ホール縫着線3sr,3srとそれぞれ連続しており、それら縫着線2sr,3sr相互の接続部は円弧状とされる。一方、両バッグ本体要素2a,2bの前半側の周縁部相互を縫着すべくその周縁に沿って延びる前側の本体縫着線2sfの左右両端は、左右の各上下ホール形成要素3a,3bの前側縁部相互を縫着すべくその前側縁に沿って延びる左右のホール縫着線3sf,3sfとそれぞれ連続しており、それら縫着線2sf,3sf相互の接続部も円弧状とされる。
【0016】
このようにバッグ本体要素2a,2b相互の縫着線2sr,2sfと、これらにそれぞれ対応するホール形成要素3a,3b相互のホール縫着線3sr,3srとを連続した縫着線とすることで、バッグ本体要素2a,2b相互の縫着(従ってエアバッグ本体2の縫製)とホール形成要素3a,3b相互の縫着(従ってホール形成部材3の縫製)とを同一の縫製工程で連続的に行なうことができるため、それだけ製造作業の能率向上やコスト節減が図られる。
【0017】
両バッグ本体要素2a,2bの前半側の周縁部相互を縫着する上記前側の本体縫着線2sfは、図示例ではエアバッグ本体2の基端開口部5を挟むように途中が分断されているが、この基端開口部5を一方のバッグ本体要素2a(又は2b)にだけ形成する場合には、該本体縫着線2sfを、後側の本体縫着線2srと同様の連続線としてもよい。尚、前記基端開口部5は、インフータIとの接続口として機能すべきものであって、公知の接続手段を以てインフレータIのガス噴出口に気密に接続される。
【0018】
このように複数個(図示例では2個)のバッグ本体要素2a,2bを相互に縫着してエアバッグ本体2を構成し、それらバッグ本体要素2a,2bにそれぞれ一体に形成したホール形成要素3a,3bを相互に縫着してチューブ状のホール形成部材3を構成すれば、ベントホールHの必要強度を損なうことなくホール形成部材3をエアバッグ本体2に一体化できることから、それだけ部品点数の削減や構造の簡略化が図られる。
【0019】
前述の如く縫製が完了した時点ではエアバッグAは図2に示す展開状態にあるので、次にこのエアバッグAをその裏側が表面となるように反転させる。この反転に際して特にチューブ状の前記ホール形成部材3は、図3や図4の(a)に示すようにバッグ内側に折り返される。このようにして裏返しの展開状態となったエアバッグAを図1に示すように所定形状に折り畳むと共に、その基端開口部5をインフレータIのガス噴出口に接続し、これらをモジュールケースC内に一纏めに収納することにより、エアバッグモジュールMを組立てることができ、これをダッシュボードパネルP内に図1に示す如く格納すると共に、必要な配線を施すようにすれば、エアバッグ装置の組付工程が終了する。
【0020】
次に前記実施例の作用について説明する。自動車Vの運転中に、図示しないセンサにより自動車Vの衝突等の非常事態発生が検出されると、その検出信号に基づいてインフレータIが作動状態となってエアバッグAを急激に膨張させる。この場合、左右の各チューブ状ホール形成部材3は膨張開始前よりエアバッグ本体2の内側に折り返された状態にあるので、バッグ膨張過程の前半においては、図4の(a)〜(c)に示すようにバッグ内圧が、折り返し状態の該ホール形成部材3をエアバッグ本体2の内面に強く押し付け(即ちホール形成要素3a,3bの内面相互を密着させてベントホールHを実質的に塞ぎ)、このため、左右のベントホールHからのガス洩れが効果的に抑えられる。
【0021】
またバッグ膨張過程の後半においてはバッグ内圧の上昇に伴い、それまで折り返し状態にあったチューブ状ホール形成部材3がガス圧および衝突時に乗員から受ける外力のためにエアバッグ本体2外側に捲れて、図4の(d)に示すように外側に凸のノズル状となり、これにより左右のベントホールHは開放状態となる。従ってこれらベントホールHを通して乗員拘束時のエアバッグA内部のガス圧を一定圧に制御して排出させることにより、乗員を効果的に拘束することができる。
【0022】
而してベントホールHからのガスの排気特性は、チューブ状ホール形成部材3の先端側および基端側の各開口幅X,Y、並びに有効長さZの適宜選定により任意に設定することができる。更に図示例のようにエアバッグ本体2を分割構成する上下一対のバッグ本体要素2a,2bを、その相互間の縫着線2sf,2srを挟んで略対称的に配置し且つその縫着線2sf,2sr上にベントホールHの位置を定めることによって、該ホールHからのガス排出量及びバッグ内圧の安定を図ることができる。
【0023】
かくして、エアバッグAの膨張過程の少なくとも初期においてベントホールHからのガス洩れが効果的に抑えられるため、インフレータIの出力、即ちガス供給量を低く設定しても所定のバッグ内圧を確保でき、従って高出力インフレータを特別に用いる必要はないので、高出力インフレータがもたらす種々の弊害が回避される。
【0024】
図5,6には、本発明の第2実施例に係るエアバッグAが示される。この実施例では、左右の各チューブ状ホール形成部材3に、それの先端開口縁3eより長手方向中間部に達する複数条(図示例では2条)のスリットSが形成される点でのみ前実施例と相違している。これらのスリットSは、図示例では、上下のホール形成要素3a,3bの前後の側縁部相互間を縫着するホール縫着線3sf,3srを該部材3の長手方向中間部で止める(即ちその各ホール縫着線3sf,3srの端末Eを該部材3の長手方向中間部に位置させる)ことにより形成されるものであり、そのホール形成要素3a,3b相互の未縫着部相互間の隙間が前記スリットSとなる。このようにホール縫着線3sf,3srをホール形成要素3a,3bの長手方向中間部までとしてその先部側に未縫着部分を残す構造を採用すれば、スリットSの形成が頗る簡単化される利点がある。
【0025】
而してこの第2実施例のようにチューブ状ホール形成部材3に前記複数条のスリットSを形成すれば、チューブ状ホール形成部材3の先部が複数の乱流板6a,6bに分割される。これら乱流板6a,6bは、図6に示すようにバッグ膨張過程に於いてベントホールHを通して噴出しようとするガス流に応じてばたついて乱流を生じさせることにより、そのガス流に対し多少とも流動抵抗を与えることができるため、バッグ内圧の低下を適度に防ぐことができて、エアバッグAによる乗員拘束特性のコントロールが容易になる利点がある。
【0026】
以上、本発明の一実施例について説明したが、本発明はその実施例に限定されることなく、本発明の範囲内で種々の実施例が可能である。例えば前実施例では、エアバッグ本体2を、上下一対のバッグ本体要素2a,2b相互を縫着して構成したが、本発明では、3個以上のバッグ本体要素相互を縫着してエアバッグ本体を構成してもよく、この場合、その少なくとも2個のバッグ本体要素にホール形成要素がそれぞれ一体に形成される。更に前実施例では、助手席側のエアバッグ装置に実施したものを示したが、本発明は運転席側のエアバッグ装置に適用してもよい。
【0027】
【発明の効果】
各請求項の発明によれば、複数個のバッグ本体要素の周縁部相互をその周縁に沿って縫着して袋状のエアバッグ本体を成すると共に、少なくとも2個のバッグ本体要素の側部にそれぞれ継ぎ目無く一体に形成した少なくとも2個のホール形成要素の側縁部相互をその側縁に沿って縫着して、両端が開放したチューブ状のホール形成部材を成することにより、該エアバッグ本体と該ホール形成部材とを相互に一体に形成したので、ベントホールの必要強度を損なうことなくチューブ状のホール形成部材を袋状のエアバッグ本体に一体化することができて、部品点数の削減や構造の簡略化が図られ、従って製造コストの節減に寄与することができる。しかもエアバッグ本体とホール形成部材との一体性を損なうことなく、エアバッグ本体及びチューブ状ホール形成部材を各々複数の要素より分割構成することができるので、ベントホールの必要強度を確保しつつ縫製の簡易化を図ることができる。
【0028】
更に請求項2の発明によれば、チューブ状ホール形成部材がエアバッグの折り畳み状態ではエアバッグ本体の内側に折り返されるので、その折り返し効果により、該バッグの膨張初期にはベントホールからのガス洩れが有効に抑えられて、それだけガス発生器の出力(即ちガス供給量)を低減でき、従って高出力ガス発生器がもたらす種々の弊害を防止することができる。
【0029】
更にまた請求項3の発明によれば、チューブ状ホール形成部材に、それの先端開口縁より長手方向中間部に達する複数条のスリットが形成されるので、それらスリットの形成によりチューブ状ホール形成部材の先部が複数の乱流板に分割され、従ってそれら乱流板がエアバッグ膨張過程でベントホールの通過ガス流に乱流を生じさせることでバッグ内圧の低下を適度に防ぐことができるため、エアバッグによる乗員拘束特性のコントロールが容易になる。
【図面の簡単な説明】
【図1】本発明エアバッグ装置を組み込んだ車室の要部縦断側面図
【図2】第1実施例に係るエアバッグの反転前(即ち縫製直後)の展開状態を示す全体斜視図
【図3】第1実施例に係るエアバッグの反転後の展開状態を示す要部斜視図
【図4】第1実施例に係るエアバッグの膨張過程を説明するための縦断作用図
【図5】第2実施例に係るエアバッグの反転前(即ち縫製直後)の展開状態を示す全体斜視図
【図6】第2実施例に係るエアバッグの膨張過程でのホール形成部材先部の状態を示す説明図
【符号の説明】
A・・・・・・・・エアバッグ
I・・・・・・・・ガス発生器としてのインフレータ
H・・・・・・・・ベントホール
M・・・・・・・・エアバッグ装置としてのエアバッグモジュール
S・・・・・・・・スリット
V・・・・・・・・乗物としての自動車
2・・・・・・・・エアバッグ本体
2a,2b・・・・バッグ本体要素
2sf,2sr・・バッグ本体要素相互の縫着線
3・・・・・・・・ホール形成部材
3e・・・・・・・先端開口縁
3a,3b・・・・ホール形成要素
3sf,3sr・・ホール形成要素相互の縫着線
[0001]
[Industrial application fields]
According to the present invention, a bag-like airbag having a vent hole for gas discharge and placed in a folded state at a normal time is rapidly inflated with a gas ejected from a gas generator such as an inflator when a predetermined emergency occurs in a vehicle. The present invention relates to a method of manufacturing an airbag apparatus that can restrain and protect the head of an occupant.
[0002]
[Prior art]
In the airbag apparatus, the vent hole is installed for the purpose of effectively restraining the occupant by adjusting the internal pressure by appropriately releasing the gas inside the airbag when the occupant is restrained.
[0003]
By the way, in the above-described airbag device, simply opening a circular hole serving as a vent hole in the airbag body may cause the opening edge to break due to the gas pressure ejected vigorously therefrom, and this problem has been solved. In order to solve the problem, for example, as disclosed in Japanese Utility Model Publication No. 5-11094, the air bag body is polymerized and bonded with a hole forming member that is made of a strong material different from that and forms a vent hole. A device that ensures the required strength of the opening edge of the vent hole is known.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, it is necessary to manufacture the airbag body and the hole forming member individually in separate steps, and then attach the hole forming member to the airbag body. There are also problems.
[0005]
Moreover, in the above-described conventional apparatus, since the vent hole is always kept open from the time when the airbag is folded and stored, the loss of gas supplied from the gas generator into the bag is increased, and therefore a predetermined bag internal pressure is reduced. In order to obtain it, it is necessary to use a gas generator with a very large gas supply, ie a high power, in proportion to the bag volume. And the high output of such a gas generator has to increase not only the strength of the airbag itself but also the overall strength of the airbag device more than necessary, leading to an increase in cost and weight, etc. There's a problem.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method of manufacturing an airbag device that can solve the above-described problems of conventional ones.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention of each claim has a bag-like airbag body and a hole forming member that is provided in the airbag body and forms a vent hole for gas discharge. In a method of manufacturing an airbag apparatus in which a certain airbag is rapidly inflated with a gas ejected from a gas generator when a predetermined emergency occurs, the airbag body is divided into a plurality of bag body elements. In addition, the hole forming member is divided from at least two hole forming elements, and the at least two hole forming elements are respectively seamlessly and integrally formed on the side portions of the at least two bag body elements. Place, while the shape formed the airbag body by sewing the peripheral edge portions cross said plurality of bag body element along its peripheral edge, the small Both are sewn along the side edges mutual two halls forming element on its side edges, characterized by that form the shape of the hole forming member shaped tube with both ends open, in particular claim The invention of 2 is an airbag device manufactured by the manufacturing method described in claim 1 , wherein the tubular hole forming member is folded inside the airbag body when the airbag is folded. Further, the invention of claim 3 is an airbag device manufactured by the manufacturing method according to claim 1, wherein the tubular hole forming member has a longitudinally intermediate portion from an opening edge of the tubular hole forming member. A plurality of slits reaching the portion are formed.
[0008]
[Operation]
According to the above feature of the invention of each claim, the periphery mutual plurality of bag body element as well as the form formed a bag-shaped airbag body and sewn along its periphery, at least two of the bag body at least two side edges mutually hole forming elements respectively formed seamlessly integrated on the side of the element sewn along its side edges to form formed a tubular hole forming member having both ends opened Thus, since the airbag body and the tube-shaped hole forming member are integrally formed with each other, the hole forming member is integrated with the airbag body without impairing the required strength of the vent hole, and the number of parts can be reduced. The structure can be simplified. In addition, the airbag body and the tube-shaped hole forming member can be divided from a plurality of elements without impairing the integrity of the airbag body and the hole forming member.
[0009]
According to the second aspect of the invention, the tubular hole forming member is folded back to the inside of the airbag body in the folded state of the airbag. For this reason, at the initial stage of inflation of the airbag, the inner pressure acts on the folded hole forming member and strongly presses the member against the inner surface of the airbag body, effectively suppressing gas leakage from the vent hole and generating more gas. The output (i.e. gas supply) of the vessel can be reduced.
[0010]
Further, according to the above feature of the invention of claim 3, the tip of the tubular hole forming member is divided into a plurality of turbulent flow plates by the formation of the slit. And these turbulent flow plates can generate a turbulent flow in the gas flow passing through the vent hole in the process of inflating the airbag, thereby giving an appropriate flow resistance to the gas flow and preventing a decrease in bag internal pressure as much as possible.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal side view of a main part of a passenger compartment incorporating an airbag device of the present invention, and FIG. 2 is an overall perspective view showing a deployed state of the airbag according to the first embodiment before reversing (immediately after sewing). 3 is a perspective view of a main part showing a deployed state of the airbag according to the first embodiment after reversing, FIG. 4 is a longitudinal action diagram for explaining an inflation process of the airbag according to the first embodiment, and FIG. FIG. 6 is an overall perspective view showing a deployed state of the airbag according to the second embodiment before reversing (immediately after sewing), and FIG. 6 is a state of the hole forming member tip portion during the inflation process of the airbag according to the second embodiment. It is explanatory drawing which shows.
[0012]
First, in FIG. 1, in a passenger compartment of a vehicle V as a vehicle, in a dashboard panel P on the passenger seat side, the airbag A folded into a predetermined shape and the airbag A to be inflated rapidly. An air bag module M as an air bag device, in which the inflator I capable of rapidly supplying gas into the bag and stored together in the module case C, is detachably stored. The inflator I constitutes a gas generator according to the present invention, and is activated based on a detection signal from a sensor (not shown) that can detect occurrence of an emergency such as a collision of the automobile V. A can be expanded rapidly. In addition, since the structure and function of such a sensor and the inflator I are conventionally well-known, description is abbreviate | omitted.
[0013]
A pair of left and right vent holes H are formed on the left and right sides of the airbag A, respectively. These vent holes H control the gas pressure inside the airbag A at the time of restraining the occupant to allow the occupant to escape. Provided for effective restraint. In FIG. 1, reference numeral 1 denotes a cover that nicely covers the airbag A in a folded state during normal times. The cover 1 is easily broken by the bag when the airbag A is inflated, so that the inflation can be easily performed. Allow.
As shown in FIG. 2, the airbag A includes a bag-shaped airbag body 2 and hole forming members 3 for forming the vent holes H on the left and right sides of the airbag body 2. The airbag body 2 is formed by sewing a pair of upper and lower bag body elements 2a and 2b formed from a flexible sheet-like airtight material so that the opposing peripheral edge portions are along the peripheral edge. It is comprised in the bag shape which has the opening part 5 (namely, front end).
[0014]
In addition, a pair of upper and lower belt-like hole forming elements 3a and 3b formed of the same material as the bag main body elements 2a and 2b are connected to the left and right sides of the bag main body elements 2a and 2b, respectively. The front and rear side edge portions of the pair of upper and lower hole forming elements 3a and 3b are sewn along the side edges (therefore, the longitudinal direction of the elements 3a and 3b). As a result, a tube-shaped hole forming member 3 is formed by the pair of upper and lower hole forming elements 3 a and 3 b, and the inner peripheral surface of the hole forming member 3 constitutes a vent hole H extending in the longitudinal direction of the member 3. To do.
[0015]
The left and right ends of the rear main body sewing line 2sr extending along the peripheral edges of the bag main body elements 2a and 2b so as to sew the peripheral edges of the rear half sides of the bag main body elements 2a and 2b The left and right rear hole sewing lines 3sr and 3sr extending along the rear side edge so as to sew the rear edge parts are continuous with each other, and the connection parts between the sewing lines 2sr and 3sr are arc-shaped. Is done. On the other hand, the left and right ends of the front main body sewing line 2sf extending along the peripheral edges of the front half sides of the bag main body elements 2a and 2b are respectively connected to the left and right upper and lower hole forming elements 3a and 3b. The left and right hole sewing lines 3sf and 3sf extending along the front side edge are sewn in order to sew the front side edges, and the connecting part between the sewing lines 2sf and 3sf is also arcuate.
[0016]
As described above, the sewing lines 2sr and 2sf between the bag body elements 2a and 2b and the hole sewing lines 3sr and 3sr between the hole forming elements 3a and 3b respectively corresponding to these are formed as continuous sewing lines. The bag body elements 2a and 2b are sewn together (thus sewing the air bag body 2) and the hole forming elements 3a and 3b are sewn together (hence sewing the hole forming member 3) continuously in the same sewing process. Therefore, it is possible to improve the efficiency of the manufacturing work and reduce the cost.
[0017]
In the illustrated example, the front-side main body sewing line 2sf for sewing the peripheral portions of the front half sides of the two bag main body elements 2a and 2b is divided in the middle so as to sandwich the proximal end opening 5 of the airbag main body 2. However, when the base end opening 5 is formed only in one bag body element 2a (or 2b), the body sewing line 2sf is a continuous line similar to the rear body sewing line 2sr. Also good. The base end opening 5 should function as a connection port with the inflator I, and is airtightly connected to the gas outlet of the inflator I by a known connection means.
[0018]
Thus, a plurality of (two in the illustrated example) bag body elements 2a and 2b are sewn together to form the airbag body 2, and the hole forming elements formed integrally with the bag body elements 2a and 2b, respectively. If the tube-shaped hole forming member 3 is formed by sewing together 3a and 3b, the hole forming member 3 can be integrated with the airbag body 2 without impairing the required strength of the vent hole H. Reduction and simplification of the structure.
[0019]
Since the airbag A is in the deployed state shown in FIG. 2 when the sewing is completed as described above, the airbag A is then reversed so that the back side is the surface. At the time of this reversal, the tube-shaped hole forming member 3 is folded back inside the bag as shown in FIG. 3 and FIG. As shown in FIG. 1, the airbag A that has been turned upside down is folded into a predetermined shape, and its base end opening 5 is connected to the gas outlet of the inflator I. As a result, the airbag module M can be assembled and stored in the dashboard panel P as shown in FIG. 1 and the necessary wiring is provided. The attaching process ends.
[0020]
Next, the operation of the embodiment will be described. When the occurrence of an emergency such as a collision of the automobile V is detected by a sensor (not shown) during operation of the automobile V, the inflator I is activated based on the detection signal, and the airbag A is inflated rapidly. In this case, each of the left and right tubular hole forming members 3 is in a state of being folded back inside the airbag body 2 before the start of inflation. Therefore, in the first half of the bag inflation process, (a) to (c) of FIG. As shown in FIG. 3, the bag forming member 3 is pressed firmly against the inner surface of the airbag body 2 (ie, the inner surfaces of the hole forming elements 3a and 3b are brought into close contact with each other to substantially close the vent hole H). For this reason, gas leakage from the left and right vent holes H is effectively suppressed.
[0021]
Further, in the latter half of the bag inflating process, as the bag internal pressure rises, the tubular hole forming member 3 that has been folded up until then is swung to the outside of the airbag body 2 due to the gas pressure and the external force received from the occupant at the time of collision, As shown in FIG. 4 (d), the shape of the nozzle is convex outward, so that the left and right vent holes H are opened. Therefore, the passenger can be effectively restrained by controlling the gas pressure inside the airbag A at the time of restraining the occupant to a constant pressure and discharging through the vent hole H.
[0022]
Thus, the exhaust characteristics of the gas from the vent hole H can be arbitrarily set by appropriately selecting the opening widths X and Y on the distal end side and the proximal end side of the tubular hole forming member 3 and the effective length Z. it can. Further, as shown in the figure, a pair of upper and lower bag body elements 2a and 2b that constitute the airbag body 2 are arranged approximately symmetrically with the sewing lines 2sf and 2sr between them and the sewing line 2sf. , 2sr to determine the position of the vent hole H, the gas discharge amount from the hole H and the bag internal pressure can be stabilized.
[0023]
Thus, since gas leakage from the vent hole H is effectively suppressed at least at the initial stage of the inflation process of the airbag A, a predetermined bag internal pressure can be secured even if the output of the inflator I, that is, the gas supply amount is set low, Accordingly, since it is not necessary to use a high-power inflator specially, various problems caused by the high-power inflator are avoided.
[0024]
5 and 6 show an airbag A according to a second embodiment of the present invention. In this embodiment, only the point in which a plurality of slits S (two in the illustrated example) slits S are formed in the left and right tube-shaped hole forming members 3 from the tip opening edge 3e to the middle in the longitudinal direction. It is different from the example. In the illustrated example, these slits S stop the hole sewing lines 3sf and 3sr that are sewn between the front and rear side edges of the upper and lower hole forming elements 3a and 3b at the intermediate portion in the longitudinal direction of the member 3 (that is, The end E of each hole sewing line 3sf, 3sr is positioned in the longitudinal intermediate portion of the member 3), and the hole forming elements 3a, 3b are not connected to each other between the unsewn portions. The gap becomes the slit S. By adopting such a structure in which the hole sewing lines 3sf and 3sr are extended to the middle part in the longitudinal direction of the hole forming elements 3a and 3b and an unsewn portion is left on the front side, the formation of the slit S is greatly simplified. There are advantages.
[0025]
Thus, if the plurality of slits S are formed in the tubular hole forming member 3 as in the second embodiment, the tip of the tubular hole forming member 3 is divided into a plurality of turbulent flow plates 6a and 6b. The These turbulent flow plates 6a and 6b flutter according to the gas flow to be ejected through the vent hole H in the bag expansion process as shown in FIG. Since the flow resistance can be given to some extent, the bag internal pressure can be appropriately prevented from being lowered, and there is an advantage that control of the passenger restraint characteristic by the airbag A is facilitated.
[0026]
As mentioned above, although one Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the previous embodiment, the airbag body 2 is constructed by sewing a pair of upper and lower bag body elements 2a, 2b, but in the present invention, three or more bag body elements are sewn together. The main body may be configured, and in this case, the hole forming elements are integrally formed in the at least two bag main body elements. Further, in the previous embodiment, the present invention is applied to the airbag device on the passenger seat side, but the present invention may be applied to the airbag device on the driver seat side.
[0027]
【The invention's effect】
According to the invention of each claim, the periphery mutual plurality of bag body element as well as the form formed a bag-shaped airbag body and sewn along its periphery, the side of at least two bag body element the side edges cross at least two holes formed element was formed seamlessly integrated respectively in section and sewn along its side edges, by that form a tubular hole forming member whose both ends open, Since the airbag main body and the hole forming member are integrally formed with each other, the tube-shaped hole forming member can be integrated with the bag-shaped airbag main body without impairing the required strength of the vent hole, The number of parts can be reduced and the structure can be simplified, which can contribute to a reduction in manufacturing cost. In addition, since the airbag body and the tube-shaped hole forming member can be divided into a plurality of elements without impairing the integrity of the airbag body and the hole forming member, sewing can be performed while ensuring the necessary strength of the vent hole. Can be simplified.
[0028]
Furthermore, according to the invention of claim 2, since the tubular hole forming member is folded inside the airbag body when the airbag is folded, gas leakage from the vent hole is caused at the initial stage of expansion of the bag due to the folding effect. Therefore, the output of the gas generator (i.e., the gas supply amount) can be reduced accordingly, and various problems caused by the high output gas generator can be prevented.
[0029]
Furthermore, according to the invention of claim 3, since the plurality of slits reaching the middle portion in the longitudinal direction from the opening edge of the tip end are formed in the tubular hole forming member, the tubular hole forming member is formed by forming these slits. The front part of the bag is divided into a plurality of turbulent flow plates, so that the turbulent flow plates can prevent the lowering of the bag internal pressure appropriately by generating turbulent flow in the gas flow passing through the vent hole during the airbag expansion process. The occupant restraint characteristic can be easily controlled by the airbag.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a main part of a passenger compartment incorporating an airbag device of the present invention. FIG. 2 is an overall perspective view showing a deployed state of an airbag according to a first embodiment before reversing (that is, immediately after sewing). 3 is a perspective view of a main part showing a deployed state of the airbag according to the first embodiment after reversal. FIG. 4 is a longitudinal sectional view for explaining an inflating process of the airbag according to the first embodiment. FIG. 6 is an overall perspective view showing an unfolded state of the airbag according to the second embodiment before reversing (that is, immediately after sewing). FIG. 6 is an explanatory view showing a state of the hole forming member tip during the inflation process of the airbag according to the second embodiment. Figure [Explanation of symbols]
A ... Airbag I ... Inflator H as a gas generator ... Venthole M ... As an airbag device Airbag module S ... Slit V ... Automobile 2 as vehicle ... Airbag body 2a, 2b ... Bag body element 2sf , 2sr ··· Sewing line 3 between bag body elements ········· Hole forming member 3e ········ Opening edge 3a, 3b ···· Hole forming elements 3sf, 3sr ··· Sewing line between hall forming elements

Claims (3)

袋状のエアバッグ本体(2)と、このエアバッグ本体(2)に設けられてガス排出用ベントホール(H)を形成するホール形成部材(3)とを有して平時には折り畳み状態にあるエアバッグ(A)を、所定の非常事態発生時にガス発生器(I)から噴出するガスで急激に膨張させるようにしたエアバッグ装置の製造方法において、
前記エアバッグ本体(2)が複数個のバッグ本体要素(2a,2b)から分割構成されると共に、前記ホール形成部材(3)が少なくとも2個のホール形成要素(3a,3b)から分割構成されており、
前記少なくとも2個のホール形成要素(3a,3b)を少なくとも2個の前記バッグ本体要素(2a,2b)の側部にそれぞれ継ぎ目無く一体に形成しておき、
前記複数個のバッグ本体要素(2a,2b)の周縁部相互をその周縁に沿って縫着して前記エアバッグ本体(2)を成すると共に、前記少なくとも2個のホール形成要素(3a,3b)の側縁部相互をその側縁に沿って縫着して、両端が開放したチューブ状の前記ホール形成部材(3)を成すことを特徴とする、エアバッグ装置の製造方法
It has a bag-shaped airbag body (2) and a hole forming member (3) that is provided in the airbag body (2) and forms a gas exhaust vent hole (H), and is in a folded state during normal times. In the method of manufacturing an airbag device in which the airbag (A) is rapidly inflated with a gas ejected from the gas generator (I) when a predetermined emergency occurs,
The airbag body (2) is divided from a plurality of bag body elements (2a, 2b), and the hole forming member (3) is divided from at least two hole forming elements (3a, 3b). And
The at least two hole forming elements (3a, 3b) are formed integrally on the side portions of the at least two bag body elements (2a, 2b), respectively, seamlessly,
Said plurality of bag body element (2a, 2b) the periphery mutually together with the to form formed the airbag body (2) by sewing along its peripheral edge of said at least two halls forming element ( 3a, and sewn side edges each other along their side edges of 3b), characterized in that both ends that form the shape of the hole forming member shaped open tube (3), manufacture of the air bag device Way .
前記請求項1に記載された製造方法により製造されたエアバッグ装置であって、
前記チューブ状ホール形成部材(3)は、前記エアバッグ(A)の折り畳み状態ではエアバッグ本体(2)の内側に折り返されることを特徴とするアバッグ装置。
An airbag device manufactured by the manufacturing method according to claim 1,
The tubular hole forming member (3) is airbags and wherein the folded is that the inside of the airbag body in a folded state of the airbag (A) (2).
前記請求項1に記載された製造方法により製造されたエアバッグ装置であって、
前記チューブ状ホール形成部材(3)には、それの先端開口縁(3e)より長手方向中間部に達する複数条のスリット(S)が形成されることを特徴とするアバッグ装置。
An airbag device manufactured by the manufacturing method according to claim 1,
Wherein the tubular hole-forming member (3), airbags apparatus characterized by plural rows of slits (S) is formed to reach the longitudinally intermediate portion than that of the tip opening edge (3e).
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