JP4988978B2 - Gas generator for airbag - Google Patents
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- JP4988978B2 JP4988978B2 JP2000092836A JP2000092836A JP4988978B2 JP 4988978 B2 JP4988978 B2 JP 4988978B2 JP 2000092836 A JP2000092836 A JP 2000092836A JP 2000092836 A JP2000092836 A JP 2000092836A JP 4988978 B2 JP4988978 B2 JP 4988978B2
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
- C06B45/12—Compositions or products which are defined by structure or arrangement of component of product having contiguous layers or zones
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
- C06D5/06—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets by reaction of two or more solids
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- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Combustion & Propulsion (AREA)
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- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、車両用エアバッグ装置の燃焼室に内蔵され、点火器により着火され、燃焼によりガスを発生させてエアバッグを膨張させるエアバッグ用ガス発生体に関する。
【０００２】
【従来の技術】
車両、例えば自動車に急激な衝撃が作用した際に、乗員を保護するためのエアバッグ装置が種々開発されている。
【０００３】
エアバッグ装置は、例えば衝突等により車両に急激な衝撃荷重が作用した際、燃焼室内に収納されたガス発生体を燃焼させてそのガスによりエアバッグを膨張展開させ、この膨張したエアバッグによって乗員を拘束して保護するものである。このエアバッグが、一段で一気に膨張展開すると、特に正規な着座姿勢でない乗員に対して大きな衝撃を与えるおそれがある。
【０００４】
この対策として、ガス発生体の燃焼速度を緩やかにしてエアバッグの展開速度を抑制したり、或いはエアバッグの展開を多段に展開することによって乗員への衝撃を緩和する方式が多く採用されている。
【０００５】
ガス発生体の燃焼速度を抑制するエアバッグの膨張方法は、例えば特開平６−１０７１０９号公報に開示されるように、ガス発生体のアジ化ナトリウム等からなる円板状に形成されたガス発生剤の一方の端面上に、金属酸化物等からなる不活性の燃焼抑制層を一体形成することによってガス発生体の燃焼速度を緩やかにして、エアバッグの展開速度を抑制するものがある。
【０００６】
一方、エアバッグの展開を多段に展開するエアバッグの膨張方法は、例えば特公昭５８−２７１３３号公報に開示されるように、通常のガス発生体と、この通常のガス発生体と同一組成のガス発生剤の表面を遅燃焼物質で被覆した遅燃ガス発生体と、通常のガス発生体と同一組成のガス発生剤の表面を速燃焼物質で被覆した速燃ガス発生体とを燃焼室内に混在させることにより、ガス発生体の着火時をずらして、エアバッグを多段階に展開膨張させるようにしたものがある。
【０００７】
また、特開平４−１４６８４３号公報に開示されるように、ガス発生器にガス発生体を収容する燃焼室を一対形成すると共に、各燃焼室にガス発生体を点火するための点火器を配設し、一方の点火器の作動後、他方の点火器を作動させることによって、各々の燃焼室のガス発生体をずらして燃焼させることによって多段にエアバッグを展開膨張させるものがある。
【０００８】
【発明が解決しようとする課題】
上記特開平６−１０７１０９号公報によると、ガス発生剤に不活性な燃焼抑制層を一体に設けることによってガス発生剤の燃焼速度が抑制され、エアバッグの展開速度が緩やかになり、乗員への衝撃が緩和される。
【０００９】
しかし、ガス発生剤の燃焼速度、即ちガス発生速度が抑制されることから、点火からエアバッグの膨張による乗員の拘束までに比較的長い作動時間を要し、所定の保護効果が達成されないおそれがある。
【００１０】
一方、特公昭５８−２７１３３号公報によると、着火時の異なるガス発生体を同一の燃焼室内に混在させることにより、エアバッグを多段階に展開膨張することができる。
【００１１】
しかし、燃焼室内に異なる特性のガス発生体を均一に分散させて収納すると共に、自動車の走行等に起因する振動が発生する状態下において、その分散状態を長期に亘って保持することは困難であり、このガス発生体の偏在によりエアバッグの多段階な展開特性にばらつきが発生するおそれがあり、エアバック装置の信頼性に影響を及ぼすことが懸念される。
【００１２】
また、特開平４−１４６８４３号公報によると、各燃焼室に収容されたガス発生体の点火時期をずらすことによってエアバッグを多段階に展開膨張させることができる。
【００１３】
しかし、ガス発生装置に複数の燃焼室を形成し、各燃焼室に点火時期の異なる点火器を各々配設する必要があり、このためにガス発生装置の構造が複雑になり、かつコンパクト化が困難であると共に、製造コストの増大を招くことが懸念される。
【００１４】
従って、かかる点に鑑みなされた本発明の目的は、簡単な構造でかつコンパクトなガス発生装置でエアバッグを多段階に展開膨張せしめることができ、信頼性の高いエアバッグ用ガス発生体を提供することにある。
【００１５】
【課題を解決するための手段】
上記目的を達成する請求項１に記載のエアバッグ用ガス発生体の発明は、エアバッグ装置の燃焼室に内蔵され、ガス発生特性が異なる複数のガス発生剤が一体に結合されて燃焼によりガスを発生させてエアバッグを膨張させるエアバッグ用ガス発生体において、環状或いは筒状に形成されたガス発生剤と、該ガス発生剤とガス発生特性が異なり上記ガス発生剤内に埋め込まれたガス発生剤と備え、これら両ガス発生剤の互いに接合する面の少なくとも一方が網状或いは海綿状の粗面状であることを特徴とする。
【００１６】
請求項１の発明によると、ガス発生体が、ガス発生特性の異なる複数のガス発生剤を一体に結合して形成されることから、単一の燃焼室及び単一の点火器を備えた簡単な構造で、かつコンパクトなガス発生装置によって、エアバッグを多段階に展開膨張させることができる。特に、両ガス発生剤の互いに接合する面の少なくとも一方が網状或いは海綿状の粗面状であることから、互いのガス発生剤の絡み付き接合強度がより確保されて分離が防止され、ガス発生特性のばらつきが抑制される。
【００１７】
請求項２に記載のエアバッグ用ガス発生体の発明は、エアバッグ装置の燃焼室に内蔵され、ガス発生剤と燃焼材料が一体に結合されて燃焼によりガスを発生させてエアバッグを膨張させるエアバッグ用ガス発生体において、上記ガス発生剤及び上記燃焼材料の一方が環状或いは筒状に形成され、該環状或いは筒状内に他方が埋め込まれ、該ガス発生剤及び燃焼材料の互いに接合する面の少なくとも一方が網状或いは海綿状の粗面形状であることを特徴とする。
【００１８】
請求項２の発明によると、ガス発生体が、ガス発生剤と燃焼材料を一体に結合して形成されることから、単一の燃焼室及び単一の点火器を備えた簡単な構造で、かつコンパクトなガス発生装置によって、エアバッグを多段階に展開膨張させることができる。特に、少なくともガス発生剤或いは燃焼材料の互いに接合する面のいずれか一方が網状或いは海綿状の粗面状であることから、ガス発生剤と燃焼材料が互いに絡み付き接合強度がより確保され、ガス発生剤と燃料材料の分離が防止され、ガス発生特性のばらつきが抑制される。
【００１９】
【発明の実施の形態】
以下、本発明によるエアバッグ用ガス発生体の各実施の形態を図によって説明する。実施の形態の説明に先立って、まず、ガス発生特性が異なる複数のガス発生剤が一体に結合されたガス発生体の参考例を説明する。
【００２０】
（参考例１）
図１及び図２により参考例１について説明する。
【００２１】
図１は、参考例１におけるガス発生体１の概要を示す斜視図、図２はガス発生体１の燃焼により発生するガス圧力と時間との関係を示す説明図である。
【００２２】
本ガス発生体１は、図１に示すように円板形状のペレットであって、円板形状の第１ガス発生剤ａと、この第１ガス発生剤ａの一方面、即ち図１における上面に一体に積層された第２ガス発生剤ｂによって形成されている。
【００２３】
第１ガス発生剤ａの層の厚さｔａは比較的厚く設定される一方、第２ガス発生剤ｂの層の厚さｔｂは比較的薄く設定されると共に、第１ガス発生剤ａと第２ガス発生剤ｂとはガス発生特性を異にしている。例えば、第１ガス発生剤ａはガス発生速度が比較的速くかつガス発生時間が長く設定される一方、第２ガス発生剤ｂはガス発生速度が比較的遅く、第１ガス発生剤ａに対して所定時間経過後にガス発生が急激に増大するように設定されている。
【００２４】
このように構成されたガス発生体１は、例えば、エアバッグ装置のガス発生器に形成された燃焼室内に所定量収納される。そして、車両の衝撃をセンサで感知すると点火器によって各ガス発生体１に点火されてガスが発生し、エアバッグ内に放出されてエアバッグが展開膨張して乗員を拘束することによって保護する。
【００２５】
この点火器によるガス発生体１の点火にあたり、各ガス発生体１は、ガス発生体１の表面側から燃焼し先ず第１ガス発生剤ａと第２ガス発生剤ｂからガスが発生してエアバッグ内に供給されてエアバッグが展開膨張を開始する。そして所定時間経過後に第２ガス発生剤ｂによるガス発生が急激に増加してエアバッグに供給される。
【００２６】
この燃焼室内に収納されたガス発生体１の燃焼によるガス発生圧力と時間との関係は、図２にガス発生圧力と時間の関係を示すように、ガス発生圧力が時間経過と共にＳ字カーブ、即ち２段階にガス発生圧力が制御されエアバッグが２段階に展開膨張される。
【００２７】
また、ガス発生体１を形成する第１ガス発生剤ａ及び第２ガス発生剤ｂのガス発生特性を、第１ガス発生剤ａの表面の単位面積当たりのガス発生量が、第２ガス発生剤ｂに対して大なるように設定することができる。
【００２８】
このガス発生体１によると、点火器による点火により、各ガス発生体１は、ガス発生体１を形成する第１ガス発生剤ａ及び第２ガス発生剤ｂの表面側から燃焼し、その燃焼表面積に応じて第１ガス発生剤ａ及び第２ガス発生剤ｂからガスが発生してエアバッグが展開膨張を開始する。しかる後、厚さｔｂの小さい第２ガス発生剤ｂの燃焼が進むに従って第１ガス発生剤ａの表面積が急激に増大してガス発生量が急激に増大せしめられる。その結果、図２に示すように２段階にガス発生圧力が制御されエアバッグが２段階に展開膨張される。
【００２９】
従って、参考例１によるガス発生体１は、ガス発生特性の異なる第１ガス発生剤ａと第２ガス発生剤ｂによって形成されることから、単一の燃焼室及び単一の点火器を備えた簡単な構造でかつ、コンパクトなガス発生装置によってエアバッグを２段階に展開膨張させることができる。また、第１ガス発生剤ａと第２ガス発生剤ｂとが一体に結合されて各ガス発生体１が形成されることから、燃焼室内において一方のガス発生剤、即ち第１ガス発生剤ａ或いは第２ガス発生剤ｂが一方に偏在することなく、第１ガス発生剤ａと第２ガス発生剤ｂが燃焼室内に均一に分散され、エアバッグの展開膨張のばらつきが抑制されてエアバッグ装置の信頼性が確保される。
【００３０】
また、第１ガス発生剤ａと第２ガス発生剤ｂを単に積層する簡単な構成によってガス発生体１が形成されることから、ガス発生体１を容易に製造することが可能であり、ガス発生体１の生産性の向上がもたらされる。
【００３１】
（参考例２）
図３は、円筒形状のペレットに形成された参考例２本実施の形態におけるガス発生体１の概要を示す斜視図である。
【００３２】
このガス発生体１は、図４に示すような、一端から他端に移行するに従ってガス発生特性の異なる第１ガス発生剤ａと、第２ガス発生剤ｂとの配分比率が変化する略矩形のシート材を柱状に巻くことによってペレット状に形成されている。
【００３３】
このように異なるガス発生特性の第１ガス発生剤ａと第２ガス発生剤ｂによって一体に形成されたガス発生体１によると、ガス発生圧力、即ちガス発生量が制御されエアバッグが多段階的に展開膨張されると共に、第１ガス発生剤ａと第２ガス発生剤ｂとからなるシート材を巻くことによって容易にガス発生体１を製造することができる。また、シート材における第１ガス発生剤ａと第２ガス発生剤ｂの配分比率を種々変えることによって容易にガス発生体１のガス発生特性を変えることができる。
【００３４】
更に、シート材をガス発生特性の異なる３つ以上のガス発生剤によって形成することによって、更にガス発生体１のガス発生特性を変えることができる。
【００３５】
（第１実施の形態）
図５は、第１実施の形態におけるガス発生体１の斜視図であって、ガス発生体１は、ガス発生特性の異なる第１ガス発生剤ａと第２ガス発生剤ｂによって形成される。
【００３６】
第１ガス発生剤ａは、環状或いは筒状に形成される一方、第２ガス発生剤ｂは図６に示すように網状或いは海綿状の粗面形状に形成され、第１ガス発生剤ａ内に第２ガス発生剤ｂを埋め込むことによって、ガス発生体１が形成される。
【００３７】
このガス発生体１によると、ガス発生圧力が制御されエアバッグが段階的に展開膨張できると共に、第２ガス発生剤ｂを粗面形状に形成することから、第１ガス発生剤ａと第２ガス発生剤ｂが互いに絡み付き、第１ガス発生剤ａと第２ガス発生剤ｂとの接合強度がより確保され、第１ガス発生剤ａと第２ガス発生剤ｂとの分離が防止されてガス発生特性のばらつきが抑制される。
【００３８】
また、第２ガス発生剤ｂに代えて第１ガス発生剤ａを網状或いは海綿状の粗面形状に形成することも、更に第１ガス発生剤ａ及び第２ガス発生剤ｂの両方を網状或いは海綿状の粗面形状に形成することも可能である。
【００３９】
次に、本発明の第２実施の形態について説明する。実施の形態の説明に先立って、ガス発生剤と燃焼材料が一体に結合されたガス発生体の参考例を説明する。
【００４０】
（参考例３）
図７は、参考例３におけるガス発生体１の斜視図、図８はガス発生体１の燃焼による発生ガス圧力と時間との関係を示す説明図である。
【００４１】
本ガス発生剤１は、図７に示すように円板形状のペレットであって、円板形状のガス発生剤ａと、このガス発生剤ａの一方の端面に一体に積層された燃焼材料ｄによって形成され、ガス発生剤ａの層の厚さｔａは比較的厚く設定される一方、燃焼材料ｄの層の厚さｔｄは比較的薄く設定されている。
【００４２】
このように構成されたガス発生体１は、エアバッグ装置のガス発生器の燃焼室に所定量収納される。
【００４３】
点火器によりガス発生体１に点火されると、各ガス発生体１は、ガス発生体１の表面、即ちガス発生剤ａ及び燃焼材料ｂの外側から燃焼し、ガス発生剤ａからガスが発生してエアバッグ内に供給されてエアバッグが展開膨張を開始する。しかる後、ガス発生剤ａの一方の端面を覆う燃焼材料ｄの焼失に伴ってガス発生剤ａの露出表面積が急激に増大し、ガス発生剤ａからのガス発生が急激に増加する。
【００４４】
この結果、燃焼室内に収納されたガス発生体１の燃焼により、図８に示すように、ガス発生圧力がＳ字カーブ、即ち２段階にガス発生圧力が制御されエアバッグが多段階に展開膨張される。
【００４５】
また、燃焼材料ｄの燃焼特性を調整することによって種々のガス発生特性が得られる。例えば燃焼特性の比較的悪い難燃材料を用いることにより、燃焼材料ｄの焼失に伴うガス発生剤ａの露出面積の増加が緩やかになり緩やかな２段階のガス発生圧力が得られる一方、燃焼特性に優れた燃焼材料を選択することによってより急激に変化する２段階のガス発生圧力が得られる。
【００４６】
また、ガス発生剤ａ及び燃焼材料ｄの厚さｔａ及びｔｄを調整することによっ
ても、種々のガス発生特性を設定することができる。
【００４７】
更に、ガス発生体１は、ガス発生剤ａと燃焼材料ｄとによって一体に形成されることから、単一の燃焼室及び単一の点火器を備えた簡単な構造でかつ、コンパクトなガス発生装置によってエアバッグを段階的に展開膨張させることができ、かつ燃焼室内においてガス発生剤ａ或いは燃焼材料ｄが一方に偏在することなく燃焼室１内に均一に分散され、エアバッグの展開膨張のばらつきが抑制されてエアバッグ装置の信頼性が確保される。
【００４８】
（参考例４）
図９は、円筒形状のペレットに形成された参考例４におけるガス発生体１の概要を示す斜視図である。
【００４９】
このガス発生体１は、図１０に示すような、一端から他端に移行するに従ってガス発生体ａと燃焼材料ｄの配分比率が変化する略矩形のシート材を柱状に巻くことによって形成されている。
【００５０】
このように一端から他端に移行するに従ってガス発生剤ａと燃焼材料ｄの配分比率が変化するシートを巻いて形成したガス発生体１によると、外部側からの燃焼に伴って、ガス発生圧力が変化すると共に、ガス発生剤ａと燃焼材料ｄとからなるシート材を巻くことによって容易にガス発生体１を製造することができる。また、シート材におけるガス発生剤ａと燃焼材料ｄの配分比率を変えることによって容易にガス発生体１のガス発生特性を変えることができる。
【００５１】
（第２実施の形態）
図１１は、本実施の形態におけるガス発生体１の斜視図であって、ガス発生体１は、ガス発生剤ａと燃焼材料ｄによって形成される。
【００５２】
ガス発生剤ａは、環状或いは筒状に形成される一方、燃焼材料ｄは図１２に示すように網状或いは海綿状の粗面状に形成され、ガス発生剤ａ内に燃焼材料ｄを埋め込むことによって、ガス発生体１が形成される。
【００５３】
このガス発生体１によると、燃焼材料ｄによってガス発生圧力が制御されエアバッグが段階的に展開膨張され、乗員の衝撃等をより緩和することができると共に、燃焼材料ｄを網状或いは海綿状の粗面状に形成することから、ガス発生剤ａと燃焼材料ｄが互いに絡み付き、ガス発生剤ａと燃焼材料ｄとの接合強度がより確保され、ガス発生剤ａと燃焼材料ｄとの分離が防止されてガス発生特性のばらつきが抑制される。
【００５４】
また、燃焼材料ｄに代えてガス発生剤ａを網状や海綿状に形成することも、更にガス発生剤ａ及び燃焼材料ｄの両方を共に網状や海綿状に形成することも可能である。
【００５５】
（参考例５）
図１３は、参考例５におけるガス発生体１の概要を示す要部断面斜視図である。ガス発生体１は、円板形状のペレットであって、ガス発生特性の異なる第１ガス発生剤ａと第２ガス発生剤ｂによって形成され、第１ガス発生剤ａを第２ガス発生剤ｂによって層状に被覆したことを特徴とし、第１ガス発生剤ａ及び第２ガス発生剤ｂのガス発生特性は、例えば、第１ガス発生剤ａの表面の単位面積当たりのガス発生量が、第２ガス発生剤ｂの表面の単位面積当たりのガス発生量に対して大なるように設定される。
【００５６】
このように構成されたガス発生体１は、点火により、ガス発生体１の表面を形成する第２ガス発生剤ｂの表面側から燃焼を開始し、第２ガス発生剤ｂから発生するガスによりエアバッグの展開膨張が開始される。しかる後、第２ガス発生剤ｂの焼却に連続して比較的大なるガス発生量を有する第１ガス発生剤ａが燃焼する。この結果、ガス発生量が急激に増大せしめられてガス発生圧力が２段階に制御されエアバッグが２段階に展開膨張される。
【００５７】
従って、第１実施の形態に加え、ガス発生体１の外周を被覆している第２ガス発生剤ｂの燃焼に連続して第１ガス発生剤ａが燃焼することから、第１ガス発生剤ａのより安定した燃焼によるガス発生特性が得られ、より確実にエアバッグが２段階に展開膨張せしめられて信頼性が更に向上する。また、第１ガス発生剤ａが第２ガス発生剤ｂによって被覆されることから、第１ガス発生剤ａが外部環境に晒されることなく長期間に亘り安定した状態に維持することができ、第１ガス発生剤ａの選択の自由度が確保される。
【００５８】
【発明の効果】
以上説明した請求項１に係る発明のエアバッグ用ガス発生体によると、ガス発生体が、ガス発生特性の異なる複数のガス発生剤を一体に結合して形成されることから、単一の燃焼室及び単一の点火器を備えた簡単な構造で、かつコンパクトなガス発生装置によって、エアバッグを多段階に展開膨張させることができる。特に、両ガス発生剤の互いに接合する面の少なくとも一方が網状或いは海綿状の粗面状であることから、互いのガス発生剤の絡み付き接合強度がより確保されて分離が防止され、ガス発生特性のばらつきが抑制される。
【００５９】
請求項２に係る発明のエアバッグ用ガス発生体によると、ガス発生体が、ガス発生剤と燃焼材料を一体に結合して形成されることから、単一の燃焼室及び単一の点火器を備えた簡単な構造で、かつコンパクトなガス発生装置によって、エアバッグを多段階に展開膨張させることができる。特に、少なくともガス発生剤或いは燃焼材料の互いに接合する面のいずれか一方が網状或いは海綿状の粗面状であることから、ガス発生剤と燃焼材料が互いに絡み付き接合強度がより確保され、ガス発生剤と燃料材料の分離が防止され、ガス発生特性のばらつきが抑制される。
【図面の簡単な説明】
【図１】本発明における参考例１を説明するガス発生体の概要を示す斜視図である。
【図２】ガス発生体の発生ガス圧力と時間との関係を示す説明図である。
【図３】参考例２を説明するガス発生体の概要を示す斜視図である。
【図４】図３のガス発生体の製造に使用されるシート材の説明図である。
【図５】本発明における第１実施の形態を説明するガス発生体の斜視図である。
【図６】図５における第２ガス発生剤の斜視図である。
【図７】参考例３を説明するガス発生体の斜視図である。
【図８】ガス発生体の発生ガス圧力と時間との関係を示す説明図である。
【図９】参考例４を説明するガス発生体の斜視図である。
【図１０】図９のガス発生体の製造に使用されるシート材の説明図である。
【図１１】本発明における第２実施の形態を説明するガス発生体の斜視図である。
【図１２】図１１における燃焼材料の斜視図である。
【図１３】参考例５を説明するガス発生体の要部断面斜視図である。
【符号の説明】
１ ガス発生体
ａ 第１ガス発生剤（ガス発生剤）
ｂ 第２ガス発生剤（ガス発生剤）
ｄ 第１燃焼材料（燃焼材料）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas generator for an air bag that is built in a combustion chamber of a vehicle air bag device, is ignited by an igniter, generates a gas by combustion, and inflates the air bag.
[0002]
[Prior art]
Various airbag devices have been developed for protecting passengers when a sudden impact is applied to a vehicle such as an automobile.
[0003]
When a sudden impact load is applied to a vehicle due to, for example, a collision, the airbag apparatus burns a gas generator stored in a combustion chamber and inflates and deploys the airbag with the gas. Is to protect and protect. If this airbag is inflated and deployed at a stroke in one step, there is a risk of giving a large impact to an occupant who is not in a normal sitting position.
[0004]
As measures against this, many methods are adopted in which the combustion speed of the gas generator is moderated to suppress the deployment speed of the airbag, or the airbag is deployed in multiple stages to reduce the impact on the occupant. .
[0005]
A method for inflating an airbag that suppresses the combustion rate of the gas generator is, for example, a gas generator formed in a disk shape made of sodium azide or the like of the gas generator as disclosed in Japanese Patent Laid-Open No. 6-107109. There is a type in which an inert combustion suppression layer made of a metal oxide or the like is integrally formed on one end surface of the agent to slow the combustion speed of the gas generator and to suppress the airbag deployment speed.
[0006]
On the other hand, an airbag inflation method for deploying airbags in multiple stages is disclosed in, for example, Japanese Examined Patent Publication No. 58-27133, an ordinary gas generator and the same composition as the ordinary gas generator. A slow-burning gas generator whose surface is covered with a slow-burning substance and a fast-burning gas generator whose surface is coated with a fast-burning substance with the same composition as that of a normal gas generator In some cases, the air bag is deployed and inflated in multiple stages by shifting the ignition timing of the gas generator.
[0007]
In addition, as disclosed in Japanese Patent Laid-Open No. 4-146443, a pair of combustion chambers for accommodating gas generators are formed in the gas generators, and an igniter for igniting the gas generators is arranged in each combustion chamber. In some cases, after one of the igniters is operated, the other igniter is operated so that the gas generators of the respective combustion chambers are displaced and burned to thereby inflate and expand the airbag in multiple stages.
[0008]
[Problems to be solved by the invention]
According to the above-mentioned JP-A-6-107109, the combustion rate of the gas generating agent is suppressed by integrally providing the gas generating agent with an inactive combustion suppression layer, and the airbag deployment speed becomes slow, so that Impact is alleviated.
[0009]
However, since the combustion rate of the gas generating agent, that is, the gas generation rate is suppressed, a relatively long operation time is required from ignition to the restraint of the occupant due to the inflation of the airbag, and the predetermined protective effect may not be achieved. is there.
[0010]
On the other hand, according to Japanese Patent Publication No. 58-27133, it is possible to deploy and inflate an airbag in multiple stages by mixing different gas generators at the time of ignition in the same combustion chamber.
[0011]
However, it is difficult to store gas generators having different characteristics uniformly dispersed in the combustion chamber and to maintain the dispersed state over a long period of time in a state where vibrations caused by driving of an automobile occur. In addition, the uneven distribution of the gas generator may cause variations in the multistage deployment characteristics of the airbag, which may affect the reliability of the airbag apparatus.
[0012]
Further, according to Japanese Patent Laid-Open No. 4-146443, the airbag can be deployed and inflated in multiple stages by shifting the ignition timing of the gas generator accommodated in each combustion chamber.
[0013]
However, it is necessary to form a plurality of combustion chambers in the gas generator, and to dispose each igniter with different ignition timings in each combustion chamber, which complicates the structure of the gas generator and makes it compact. This is difficult and causes an increase in manufacturing cost.
[0014]
Accordingly, an object of the present invention made in view of such a point is to provide a highly reliable gas generator for an air bag, which can deploy and inflate an air bag in multiple stages with a simple structure and a compact gas generator. There is to do.
[0015]
[Means for Solving the Problems]
The invention of the gas generator for an air bag according to claim 1, which achieves the above object, is built in a combustion chamber of an air bag device, and a plurality of gas generating agents having different gas generating characteristics are integrally combined to form a gas by combustion. In an air bag gas generator for inflating an air bag by generating gas, a gas generating agent formed in an annular or cylindrical shape, and a gas that has different gas generating characteristics from the gas generating agent and is embedded in the gas generating agent It is characterized in that at least one of the surfaces of the two gas generating agents joined to each other is a net-like or sponge-like rough surface.
[0016]
According to the first aspect of the present invention, since the gas generator is formed by integrally combining a plurality of gas generating agents having different gas generation characteristics, a simple combustion chamber and a single igniter are provided. The air bag can be deployed and inflated in multiple stages with a simple structure and a compact gas generator. In particular, since at least one of the surfaces of the two gas generating agents joined to each other is a net-like or sponge-like rough surface, the entangled joining strength of the gas generating agents is further ensured and separation is prevented, and the gas generation characteristics The variation of is suppressed.
[0017]
The invention of the gas generator for an air bag according to claim 2 is incorporated in a combustion chamber of the air bag device, and the gas generating agent and the combustion material are integrally coupled to generate gas by combustion to inflate the air bag. In the gas generator for an air bag, one of the gas generating agent and the combustion material is formed in an annular shape or a cylindrical shape, the other is embedded in the annular shape or the cylindrical shape, and the gas generating agent and the combustion material are joined to each other. At least one of the surfaces has a net-like or sponge-like rough surface shape.
[0018]
According to the invention of claim 2, since the gas generator is formed by integrally combining the gas generating agent and the combustion material, with a simple structure including a single combustion chamber and a single igniter, The airbag can be deployed and inflated in multiple stages by a compact gas generator. In particular, since at least one of the surfaces of the gas generating agent or the combustion material to be joined to each other is a net-like or spongy rough surface, the gas generating agent and the combustion material are entangled with each other, and the joining strength is further ensured, and the gas generation Separation of the agent and the fuel material is prevented, and variations in gas generation characteristics are suppressed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the gas generator for an air bag according to the present invention will be described with reference to the drawings. Prior to the description of the embodiment, first, a reference example of a gas generator in which a plurality of gas generating agents having different gas generation characteristics are combined together will be described.
[0020]
(Reference Example 1)
Reference Example 1 will be described with reference to FIGS.
[0021]
FIG. 1 is a perspective view showing an outline of the gas generator 1 in Reference Example 1, and FIG. 2 is an explanatory diagram showing the relationship between the gas pressure generated by the combustion of the gas generator 1 and time.
[0022]
The gas generator 1 is a disk-shaped pellet as shown in FIG. 1, and is a disk-shaped first gas generating agent a and one surface of the first gas generating agent a, that is, the upper surface in FIG. Are formed by the second gas generating agent b laminated integrally.
[0023]
The thickness ta of the first gas generant a is set to be relatively thick, while the layer thickness tb of the second gas generant b is set to be relatively thin, and the first gas generant a and the first gas generant a The gas generating characteristics are different from those of the two gas generating agent b. For example, the first gas generating agent a has a relatively high gas generation rate and a long gas generation time, while the second gas generating agent b has a relatively slow gas generation rate, which is higher than that of the first gas generating agent a. The gas generation is set so as to increase rapidly after a predetermined time has elapsed.
[0024]
The gas generator 1 configured as described above is stored in a predetermined amount in, for example, a combustion chamber formed in a gas generator of an airbag device. When the impact of the vehicle is sensed by a sensor, each gas generator 1 is ignited by an igniter to generate gas, which is released into the airbag, and the airbag is deployed and inflated to protect the occupant.
[0025]
When the gas generator 1 is ignited by the igniter, each gas generator 1 burns from the surface side of the gas generator 1, and firstly gas is generated from the first gas generating agent a and the second gas generating agent b. The airbag is supplied into the bag and starts to expand and inflate. Then, after a predetermined time has elapsed, the gas generation by the second gas generating agent b increases rapidly and is supplied to the airbag.
[0026]
The relationship between the gas generation pressure due to the combustion of the gas generator 1 accommodated in the combustion chamber and time is as follows. As shown in FIG. That is, the gas generation pressure is controlled in two stages, and the airbag is deployed and inflated in two stages.
[0027]
Further, the gas generation characteristics of the first gas generating agent a and the second gas generating agent b forming the gas generator 1 are the same as the gas generation amount per unit area of the surface of the first gas generating agent a. It can set so that it may become large with respect to the agent b.
[0028]
According to this gas generator 1, each gas generator 1 burns from the surface side of the first gas generating agent a and the second gas generating agent b forming the gas generating body 1 by ignition by the igniter, and the combustion Gas is generated from the first gas generating agent a and the second gas generating agent b in accordance with the surface area, and the airbag starts to expand and expand. Thereafter, as the combustion of the second gas generating agent b having a small thickness tb progresses, the surface area of the first gas generating agent a rapidly increases and the amount of gas generated increases rapidly. As a result, as shown in FIG. 2, the gas generation pressure is controlled in two stages, and the airbag is deployed and inflated in two stages.
[0029]
Therefore, the gas generator 1 according to the reference example 1 is formed by the first gas generating agent a and the second gas generating agent b having different gas generation characteristics, and thus includes a single combustion chamber and a single igniter. The airbag can be deployed and inflated in two stages by a simple gas generator that has a simple structure. In addition, since the first gas generating agent a and the second gas generating agent b are integrally coupled to form each gas generator 1, one gas generating agent in the combustion chamber, that is, the first gas generating agent a. Alternatively, the first gas generating agent a and the second gas generating agent b are uniformly dispersed in the combustion chamber without the second gas generating agent b being unevenly distributed on one side, and the variation in the expansion and expansion of the airbag is suppressed. The reliability of the device is ensured.
[0030]
In addition, since the gas generator 1 is formed by a simple configuration in which the first gas generating agent a and the second gas generating agent b are simply laminated, the gas generator 1 can be easily manufactured, The productivity of the generator 1 is improved.
[0031]
( Reference Example 2 )
FIG. 3 is a perspective view showing an outline of the gas generator 1 according to the second embodiment, which is formed in a cylindrical pellet.
[0032]
As shown in FIG. 4, the gas generator 1 has a substantially rectangular shape in which the distribution ratio of the first gas generating agent a and the second gas generating agent b having different gas generation characteristics changes as it moves from one end to the other end. The sheet material is rolled into a columnar shape to form a pellet.
[0033]
As described above, according to the gas generator 1 integrally formed by the first gas generating agent a and the second gas generating agent b having different gas generation characteristics, the gas generation pressure, that is, the gas generation amount is controlled, and the airbag is multistage. In addition, the gas generator 1 can be easily manufactured by winding and expanding a sheet material composed of the first gas generating agent a and the second gas generating agent b. Further, the gas generation characteristics of the gas generator 1 can be easily changed by variously changing the distribution ratio of the first gas generating agent a and the second gas generating agent b in the sheet material.
[0034]
Furthermore, by forming the sheet material with three or more gas generating agents having different gas generating characteristics, the gas generating characteristics of the gas generator 1 can be further changed.
[0035]
(First Embodiment)
FIG. 5 is a perspective view of the gas generator 1 in the first embodiment, and the gas generator 1 is formed by a first gas generating agent a and a second gas generating agent b having different gas generation characteristics.
[0036]
The first gas generating agent a, while being formed in an annular or tubular, the second gas generating agent b is formed on the net-like or spongy rough surface shape, as shown in FIG. 6, the first gas generating agent within a The gas generator 1 is formed by embedding the second gas generating agent b in
[0037]
According to this gas generator 1, since the gas generation pressure is controlled and the airbag can be deployed and inflated stepwise, the second gas generating agent b is formed into a rough surface shape. The gas generating agent b is entangled with each other, the bonding strength between the first gas generating agent a and the second gas generating agent b is further ensured, and the separation of the first gas generating agent a and the second gas generating agent b is prevented. Variations in gas generation characteristics are suppressed.
[0038]
Further, instead of the second gas generating agent b, the first gas generating agent a may be formed in a net-like or sponge-like rough surface shape, and both the first gas generating agent a and the second gas generating agent b may be formed in a net-like shape. or Ru can also der be formed into sponge-like rough surface shape.
[0039]
Next, a second embodiment of the present invention will be described. Prior to the description of the embodiment, a reference example of a gas generator in which a gas generating agent and a combustion material are integrally bonded will be described.
[0040]
(Reference Example 3 )
FIG. 7 is a perspective view of the gas generator 1 in Reference Example 3 , and FIG. 8 is an explanatory diagram showing the relationship between the gas pressure generated by the combustion of the gas generator 1 and time.
[0041]
The gas generating agent 1 is a disk-shaped pellet as shown in FIG. 7, and includes a disk-shaped gas generating agent a and a combustion material d laminated integrally on one end face of the gas generating agent a. The layer thickness ta of the gas generating agent a is set to be relatively thick, while the layer thickness td of the combustion material d is set to be relatively thin.
[0042]
The gas generator 1 configured as described above is stored in a predetermined amount in the combustion chamber of the gas generator of the airbag apparatus.
[0043]
When the gas generator 1 is ignited by the igniter, each gas generator 1 burns from the surface of the gas generator 1, that is, from the outside of the gas generating agent a and the combustion material b, and gas is generated from the gas generating agent a. Then, the air bag is supplied into the air bag and the air bag starts to expand and inflate. Thereafter, the exposed surface area of the gas generating agent a suddenly increases with the burning of the combustion material d covering one end surface of the gas generating agent a, and the gas generation from the gas generating agent a increases rapidly.
[0044]
As a result, the combustion of the gas generator 1 housed in the combustion chamber causes the gas generation pressure to be an S-shaped curve, that is, the gas generation pressure is controlled in two stages, as shown in FIG. Is done.
[0045]
Various gas generation characteristics can be obtained by adjusting the combustion characteristics of the combustion material d. For example, by using a flame retardant material having relatively poor combustion characteristics, an increase in the exposed area of the gas generating agent a due to the burning of the combustion material d is moderated, and a gentle two-stage gas generation pressure can be obtained. By selecting an excellent combustion material, a two-stage gas generation pressure that changes more rapidly can be obtained.
[0046]
Various gas generation characteristics can also be set by adjusting the thicknesses ta and td of the gas generating agent a and the combustion material d.
[0047]
Further, since the gas generator 1 is integrally formed by the gas generating agent a and the combustion material d, the gas generator 1 has a simple structure including a single combustion chamber and a single igniter, and a compact gas generator. The airbag can be deployed and expanded stepwise by the apparatus, and the gas generating agent a or the combustion material d is uniformly distributed in the combustion chamber 1 without being unevenly distributed in the combustion chamber. The variation is suppressed and the reliability of the airbag device is ensured.
[0048]
( Reference Example 4 )
FIG. 9 is a perspective view showing an outline of the gas generator 1 in Reference Example 4 formed in a cylindrical pellet.
[0049]
This gas generator 1 is formed by winding a substantially rectangular sheet material in which the distribution ratio of the gas generator a and the combustion material d changes as it moves from one end to the other end as shown in FIG. Yes.
[0050]
As described above, according to the gas generator 1 formed by winding a sheet in which the distribution ratio of the gas generating agent a and the combustion material d changes as it moves from one end to the other end, the gas generation pressure is accompanied by combustion from the outside. The gas generator 1 can be easily manufactured by winding a sheet material made of the gas generating agent a and the combustion material d. Further, the gas generation characteristics of the gas generator 1 can be easily changed by changing the distribution ratio of the gas generating agent a and the combustion material d in the sheet material.
[0051]
(Second Embodiment)
FIG. 11 is a perspective view of the gas generator 1 in the present embodiment, and the gas generator 1 is formed of a gas generating agent a and a combustion material d.
[0052]
The gas generating agent a is formed in an annular or cylindrical shape, while the combustion material d is formed in a net-like or spongy rough surface as shown in FIG. 12, and the combustion material d is embedded in the gas generating agent a. As a result, the gas generator 1 is formed.
[0053]
According to the gas generator 1, combustion materials airbag gas generating pressure is controlled by d is inflated gradual rollout, it is possible to further relax the occupant such as an impact, net or spongy the combustion material d Since the gas generating agent a and the combustion material d are entangled with each other, the bonding strength between the gas generating agent a and the combustion material d is further secured, and the gas generating agent a and the combustion material d are separated from each other. Is prevented and variation in gas generation characteristics is suppressed.
[0054]
It is also, Ru possible der be further formed on both net or spongy both of the gas generating agent a and combustion materials d forming the gas generating agent a in place of the pyrotechnic material d reticulated or spongy.
[0055]
( Reference Example 5 )
FIG. 13 is a cross-sectional perspective view of a main part showing an outline of the gas generator 1 in Reference Example 5. The gas generating body 1 is a disk-shaped pellet, and is formed by a first gas generating agent a and a second gas generating agent b having different gas generating characteristics, and the first gas generating agent a is converted into the second gas generating agent b. The gas generation characteristics of the first gas generating agent a and the second gas generating agent b include, for example, the amount of gas generated per unit area of the surface of the first gas generating agent a. It is set so as to be larger than the amount of gas generated per unit area of the surface of the two gas generating agent b.
[0056]
The gas generator 1 configured in this manner starts combustion from the surface side of the second gas generating agent b that forms the surface of the gas generator 1 by ignition, and the gas generated from the second gas generating agent b The airbag is inflated and inflated. Thereafter, the first gas generating agent a having a relatively large gas generation amount burns continuously after the incineration of the second gas generating agent b. As a result, the gas generation amount is rapidly increased, the gas generation pressure is controlled in two stages, and the airbag is deployed and inflated in two stages.
[0057]
Therefore, in addition to the first embodiment, since the first gas generating agent a burns continuously after the combustion of the second gas generating agent b covering the outer periphery of the gas generator 1, the first gas generating agent Gas generation characteristics due to more stable combustion of a can be obtained, and the airbag can be more reliably deployed and expanded in two stages, further improving reliability. Further, since the first gas generating agent a is coated with the second gas generating agent b, the first gas generating agent a can be maintained in a stable state for a long period without being exposed to the external environment, The degree of freedom in selecting the first gas generating agent a is ensured.
[0058]
【Effect of the invention】
According to the gas generator for an air bag of the invention according to claim 1 described above, since the gas generator is formed by integrally combining a plurality of gas generating agents having different gas generation characteristics, a single combustion is performed. The airbag can be deployed and inflated in multiple stages by a simple gas generator with a chamber and a single igniter. In particular, since at least one of the surfaces of the two gas generating agents joined to each other is a net-like or sponge-like rough surface, the entangled joining strength of the gas generating agents is further ensured and separation is prevented, and the gas generation characteristics The variation of is suppressed.
[0059]
According to the gas generator for an air bag of the invention according to claim 2 , since the gas generator is formed by integrally combining the gas generating agent and the combustion material, a single combustion chamber and a single igniter are provided. The airbag can be deployed and inflated in multiple stages by a simple structure and a compact gas generator. In particular, since at least one of the surfaces of the gas generating agent or the combustion material to be joined to each other is a net-like or spongy rough surface, the gas generating agent and the combustion material are entangled with each other, and the joining strength is further ensured, and the gas generation Separation of the agent and the fuel material is prevented, and variations in gas generation characteristics are suppressed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a gas generator for explaining Reference Example 1 in the present invention.
FIG. 2 is an explanatory diagram showing a relationship between a generated gas pressure of a gas generator and time.
3 is a perspective view showing an outline of a gas generator for explaining Reference Example 2. FIG.
4 is an explanatory view of a sheet material used for manufacturing the gas generator of FIG. 3; FIG.
FIG. 5 is a perspective view of a gas generator for explaining a first embodiment of the present invention.
6 is a perspective view of the second gas generating agent in FIG. 5. FIG.
7 is a perspective view of a gas generator for explaining Reference Example 3. FIG.
FIG. 8 is an explanatory diagram showing a relationship between a generated gas pressure of a gas generator and time.
9 is a perspective view of a gas generator for explaining Reference Example 4. FIG.
10 is an explanatory view of a sheet material used for manufacturing the gas generating body of FIG. 9;
FIG. 11 is a perspective view of a gas generator for explaining a second embodiment of the present invention.
12 is a perspective view of the combustion material in FIG. 11. FIG.
13 is a cross-sectional perspective view of an essential part of a gas generator for explaining Reference Example 5. FIG.
[Explanation of symbols]
1 Gas Generator a First Gas Generating Agent (Gas Generating Agent)
b Second gas generant (gas generant)
d First combustion material (combustion material)
Claims (2)
環状或いは筒状に形成されたガス発生剤と、該ガス発生剤とガス発生特性が異なり上記ガス発生剤内に埋め込まれたガス発生剤と備え、これら両ガス発生剤の互いに接合する面の少なくとも一方が網状或いは海綿状の粗面状であることを特徴とするエアバッグ用ガス発生体。In a gas generator for an air bag which is built in a combustion chamber of an air bag device and in which a plurality of gas generating agents having different gas generation characteristics are integrally coupled to generate gas by combustion to inflate the air bag,
A gas generating agent formed in an annular shape or a cylindrical shape, and a gas generating agent that is different in gas generating characteristics from the gas generating agent and embedded in the gas generating agent, and at least the surfaces of these gas generating agents that are joined to each other A gas generator for an air bag, wherein one of them is a net-like or sponge-like rough surface.
上記ガス発生剤及び上記燃焼材料の一方が環状或いは筒状に形成され、該環状或いは筒状内に他方が埋め込まれ、該ガス発生剤及び燃焼材料の互いに接合する面の少なくとも一方が網状或いは海綿状の粗面形状であることを特徴とするエアバッグ用ガス発生体。In a gas generator for an air bag that is built in a combustion chamber of an air bag device, in which a gas generating agent and a combustion material are integrally combined to generate a gas by combustion to inflate the air bag,
One of the gas generating agent and the combustion material is formed in an annular shape or a cylindrical shape, the other is embedded in the annular shape or the cylindrical shape, and at least one of the surfaces where the gas generating agent and the combustion material are joined to each other is a net shape or a sponge. A gas generator for an air bag having a rough surface shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000092836A JP4988978B2 (en) | 2000-03-30 | 2000-03-30 | Gas generator for airbag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000092836A JP4988978B2 (en) | 2000-03-30 | 2000-03-30 | Gas generator for airbag |
Publications (2)
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| JP2001278690A JP2001278690A (en) | 2001-10-10 |
| JP4988978B2 true JP4988978B2 (en) | 2012-08-01 |
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| JP2000092836A Expired - Fee Related JP4988978B2 (en) | 2000-03-30 | 2000-03-30 | Gas generator for airbag |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502513B1 (en) * | 2000-11-17 | 2003-01-07 | Autoliv Asp, Inc. | Tablet form of gas generant |
| EP2190801A2 (en) * | 2007-08-13 | 2010-06-02 | Autoliv Asp, Inc. | Multi-composition pyrotechnic grain and related method of forming |
| WO2010137933A1 (en) * | 2009-05-26 | 2010-12-02 | Boris Jankovski | Gas generating charges for aerosol fire suppression devices and their production technology |
| JP2011236067A (en) * | 2010-05-06 | 2011-11-24 | Asahi Kasei Chemicals Corp | Highly progressive combustion gas generator |
| JP5704970B2 (en) * | 2011-03-03 | 2015-04-22 | 積水化学工業株式会社 | Gas generating material and micro pump |
| DE102011116592A1 (en) * | 2011-10-21 | 2013-04-25 | Bayern-Chemie Gesellschaft Für Flugchemische Antriebe Mbh | Fuel moldings for a gas generator |
| DE102012024799A1 (en) * | 2012-12-19 | 2014-06-26 | Trw Airbag Systems Gmbh | Propelling charge element for gas generator of safety device in vehicle, has core, which is made of pyrotechnic material and is partially surrounded with sleeve made of material retarding burning of core, where sleeve is pressed on core |
| DE102022108291A1 (en) | 2022-04-06 | 2023-10-12 | Zf Airbag Germany Gmbh | Pressed fuel element, process for its production and gas generator with fuel element |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572679B2 (en) * | 1973-11-29 | 1982-01-18 | ||
| JPS5827133B2 (en) * | 1973-12-27 | 1983-06-07 | 日本油脂株式会社 | If you have any questions or concerns, please do not hesitate to contact us. |
| FR2285271A1 (en) * | 1974-09-17 | 1976-04-16 | Dba | BRAKE CORRECTOR |
| US4696705A (en) * | 1986-12-24 | 1987-09-29 | Trw Automotive Products, Inc. | Gas generating material |
| JPH0648880A (en) * | 1992-06-05 | 1994-02-22 | Trw Inc | Multi-layer type gas generating disk for gas generator |
| CA2094888A1 (en) * | 1992-08-24 | 1994-02-25 | Bradley W. Smith | Gas generant body having pressed-on burn inhibitor layer |
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| JP2001278690A (en) | 2001-10-10 |
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