JP2005280629A - Air bag device and air bag folding method - Google Patents

Air bag device and air bag folding method Download PDF

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JP2005280629A
JP2005280629A JP2004101576A JP2004101576A JP2005280629A JP 2005280629 A JP2005280629 A JP 2005280629A JP 2004101576 A JP2004101576 A JP 2004101576A JP 2004101576 A JP2004101576 A JP 2004101576A JP 2005280629 A JP2005280629 A JP 2005280629A
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airbag
deployment
gas
folded
inflator
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JP4376677B2 (en
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Hidenobu Suzuki
秀伸 鈴木
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Nihon Plast Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To materialize required deployment characteristics, while reducing a manufacturing cost. <P>SOLUTION: An folded airbag 15 comprises a first deploying portion 51 in which gas is induced, and an aggregating portion 52 continuing to the first deploying portion 51. The aggregating portion 52 comprises an upper deploying portion 61 and a lower deploying portion 62. The upper deploying portion 61 is folded in a wavelike shape, and the lower deploying portion 62 is folded in a generally wavelike shape, thereby forming the aggregating portion 52. The first deploying portion 51 is wound around the lower develop portion 62 alone. When gas is supplied into the folded and stored airbag 15, the first deploying portion 51 develops to rotate the aggregating portion 52 so as to rise, and immediately after that, the upper deploying portion 61 and the lower deploying portion 62 of the aggregating portion 52 are developed. Excessive rise in the inner pressure of the airbag 15 can be suppressed, so that a load applied to the airbag 15 can be decreased while using a combustion type inflater 16 having quick starting characteristics. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えば、自動車のインストルメントパネルに装着される助手席乗員用のエアバッグ装置及びエアバッグの折畳方法に関する。   The present invention relates to an airbag device for a passenger on a passenger seat mounted on an instrument panel of an automobile, for example, and an airbag folding method.

従来、例えば、自動車のインストルメントパネルに備えられる助手席乗員用のエアバッグ装置が知られている。このエアバッグ装置は、箱状をなすケース体を備え、このケース体の内側に、ガスを噴射するインフレータと、折り畳まれたエアバッグとを収納している。また、ケース体には、乗員側などに向かって突出口が形成され、この突出口が破断可能なカバー体により覆われているとともに、ブラケットを介して、車体側の被取付部材に固定されている。そして、自動車の衝突時には、インフレータからガスを噴射してエアバッグを膨張させ、この膨張の圧力によりカバー体を所定のテアラインで破断して開口を形成し、この開口からエアバッグを突出させて乗員の前方に膨張展開させ、乗員に加わる衝撃を緩和するようになっている。   DESCRIPTION OF RELATED ART Conventionally, the airbag apparatus for passenger seat passenger | crew with which the instrument panel of a motor vehicle is equipped is known, for example. This airbag device includes a box-shaped case body, and an inflator for injecting gas and a folded airbag are accommodated inside the case body. Further, the case body has a protruding opening formed toward the occupant side and the like, and the protruding opening is covered with a breakable cover body, and is fixed to the attachment member on the vehicle body side via the bracket. Yes. In the event of a car collision, the airbag is inflated by injecting gas from the inflator, the cover body is broken at a predetermined tear line by the pressure of the inflation, and an opening is formed. The vehicle is inflated and deployed in front of the vehicle to reduce the impact on the passenger.

そして、このようなエアバッグの展開特性を向上する構成として、エアバッグを、インフレータからガスを供給される第1展開部と、この第1展開部の先端側の所定点から2方に伸びる第2展開部とを形成した略T字状の中間形状に折り畳み、さらに各第2展開部を所定点側に集合させて集合部を形成し、さらに、この集合部の周囲に第1展開部を巻き付けてケースに収納する構成が知られている(例えば、特許文献1参照。)。   And as a structure which improves the deployment characteristic of such an airbag, the airbag extends in two directions from a first deployment part supplied with gas from the inflator and a predetermined point on the tip side of the first deployment part. Folded into a substantially T-shaped intermediate shape formed with two unfolded portions, and further, the second unfolded portions are gathered to a predetermined point side to form a gathered portion. Further, the first unfolded portion is disposed around the gathered portion. A configuration is known that is wound and stored in a case (see, for example, Patent Document 1).

そして、この構成では、エアバッグが折り畳まれてケース体に収納された状態で、複数の第2展開部を集合した集合部において、基布は面方向を水平方向に沿わせて積層された状態となるとともに、第1展開部は、集合部の前側から上側すなわち突出口を覆い、さらに、乗員側となる後側の約2分の1の高さまで下がった位置から集合部の内側に延設され、第1展開部と第2展開部とが略T字状に交差する交点となる所定点は、集合部の前側の端部であって高さ方向の中間部に位置する。   In this configuration, in the state where the airbag is folded and stored in the case body, the base fabric is stacked with the surface direction aligned in the horizontal direction in the aggregate portion where the plurality of second deployment portions are gathered. And the first deployment part extends from the front side of the assembly part to the upper side, that is, the projecting port, and further extends to the inside of the assembly part from a position lowered to about half the height of the rear side to be the occupant side. The predetermined point that is the intersection point where the first development portion and the second development portion intersect in a substantially T shape is located at the front end portion of the assembly portion and in the intermediate portion in the height direction.

そこで、インフレータからエアバッグにガスが供給されると、まず、所定点までガスが供給されて第1展開部が正面側に膨出し、この後、集合部の第2展開部が正面側と交差する方向に方向に膨出して最終展開形状を得る構成により、保護対象に対する圧力を低減できるとの効果を奏している。しかしながら、この構成では、第1展開部は集合部の略全周に巻き付けられる長さを有しており、長めに設定された第1展開部を備える構成では、展開初期にエアバッグの内圧が大きくなりやすい。このように内圧が高い構成は、保護対象に関しては問題とはならないが、起動と同時に急峻に圧力が上昇する特性のインフレータと組み合わせた場合には、エアバッグにかかる負担が大きくなる。すなわち、圧縮ガス容器の封印を開放してガスを噴射するインフレータ、例えば、ガスの全部を貯蔵ガスでまかなうストレージタイプや、ガスの主要部を貯蔵ガスでまかなうハイブリッドタイプのインフレータでは、インフレ−タの立ち上がり時の特性が穏やかであり、すなわち、熱ガスによる熱負荷が小さく、圧力の上昇カーブも比較的緩やかなため、エアバッグの基布や縫合部にかかる負荷は比較的小さく、厳重な補強を施す必要はない。しかしながら、仮に、上記の形状に折り畳まれたエアバッグに、硝酸アンモニウムなどを含む薬剤の燃焼によりガスを生成する燃焼型(パイロテクニック型)のインフレ−タを組み合わせた場合には、熱負荷は大きくなり、圧力上昇カーブも急峻になるため、エアバッグの基布の補強や、インフレータの圧力上昇特性を抑制する調整などが必要になり、製造コストが上昇する問題を有している。一方、従来の助手席用エアバッグ装置で用いられているシリンダー型形状の例えばハイブリッドタイプのインフレータは、構造が複雑で製造コストの低減が困難である。一方、燃焼型のインフレ−タは、比較的小型のディスク型形状で、一般的に広く用いられており、安価に安定して供給され、運転席用のエアバッグ装置のインフレ−タとの共通化も可能となるとともに、急峻な圧力特性を利用してエアバッグの迅速な展開が可能になり、所望の展開特性を容易に実現できる利点を有している。   Therefore, when gas is supplied from the inflator to the airbag, first, gas is supplied up to a predetermined point and the first deploying portion expands to the front side, and then the second deploying portion of the collecting portion intersects the front side. With the configuration in which the final developed shape is obtained by bulging in the direction in which the pressure is applied, there is an effect that the pressure on the protection target can be reduced. However, in this configuration, the first deployment portion has a length that is wound around substantially the entire circumference of the assembly portion, and in the configuration including the first deployment portion that is set longer, the internal pressure of the airbag is initially in the deployment. Easy to grow. Such a configuration with a high internal pressure is not a problem with respect to the object to be protected, but when combined with an inflator having a characteristic that the pressure rises suddenly at the time of activation, the burden on the airbag increases. That is, an inflator that opens a compressed gas container and injects gas, for example, a storage type that covers all of the gas with stored gas, or a hybrid type inflator that covers the main part of the gas with stored gas, The characteristic at the time of start-up is gentle, that is, the heat load due to the hot gas is small, and the pressure rise curve is relatively gradual, so the load on the airbag fabric and stitching part is relatively small and strict reinforcement is required. There is no need to apply. However, if an air bag folded into the above shape is combined with a combustion type (pyro technique type) inflector that generates gas by burning chemicals containing ammonium nitrate, etc., the thermal load will increase. Since the pressure increase curve also becomes steep, it is necessary to reinforce the base fabric of the airbag and to adjust the pressure increase characteristic of the inflator, which increases the manufacturing cost. On the other hand, for example, a hybrid type inflator of a cylinder type used in a conventional passenger airbag device has a complicated structure and it is difficult to reduce manufacturing costs. On the other hand, the combustion type inflator is a relatively small disk type shape and is generally widely used, is supplied stably at a low cost, and is common with the inflator of the airbag device for the driver's seat. In addition, the air bag can be quickly deployed using the steep pressure characteristics, and the desired deployment characteristics can be easily realized.

また、助手席用などのエアバッグ装置については、エアバッグ装置に保護対象である乗員が極めて近接した状態でエアバッグ装置が作動するいわゆる近接展開の際に、乗員に加わる力を容易に抑制できる構成が求められている。   In addition, for an airbag device for a passenger seat or the like, it is possible to easily suppress the force applied to the occupant during the so-called proximity deployment in which the airbag device operates in a state where the occupant to be protected is very close to the airbag device Configuration is required.

この点、例えば、エアバッグの大部分を蛇腹状に折り畳んでケース体に収納するとともに、この蛇腹状に折り畳んだ部分の前側に位置して、小容量の部分を折り畳んで収納した構成が知られている(例えば、特許文献2参照。)。この構成では、展開初期に、小容量の部分が前方に展開し、この後、蛇腹状の部分が展開するようになっている。しかしながら、このように小バッグの展開の後に主バッグを展開させる構成では、一層インフレ−タの特性が穏やかである必要がある。すなわち、最初に膨出する小バッグの容量はきわめて小さく、主バッグが小バッグにより進路を塞がれて僅かな膨張しかできないと、内圧が上昇した状態が一定の時間継続することになる。そこで、このような構成では、乗員の腹部に向けて好ましく展開するエアバッグに穏やかな特性のインフレ−タを組み合わせるか、あるいは、エアバッグの厳重な補強が必要になり、エアバッグの迅速な展開と近接展開特性の両立は技術的に容易でなく、製造コストの低減は容易ではない。
特開2000−79862号公報 (図4、図10、図11、図15) 特開平8−72656号公報 (図15−図20)
In this regard, for example, a configuration is known in which most of the airbag is folded in a bellows shape and stored in a case body, and a small capacity portion is folded and stored in front of the bellows folded portion. (For example, see Patent Document 2). In this configuration, at the initial stage of deployment, the small-capacity part is deployed forward, and thereafter the bellows-like part is deployed. However, in such a configuration in which the main bag is deployed after the small bag is deployed, the characteristics of the inflator need to be more gentle. That is, the capacity of the small bag that bulges first is extremely small. If the main bag is blocked by the small bag and can only be slightly inflated, the state in which the internal pressure has increased continues for a certain period of time. Therefore, in such a configuration, an airbag that is preferably deployed toward the occupant's abdomen is combined with an inflator having a gentle characteristic, or strict reinforcement of the airbag is required, so that the airbag can be rapidly deployed. It is not technically easy to achieve both the close deployment characteristics and the reduction in manufacturing cost.
Japanese Unexamined Patent Publication No. 2000-79862 (FIGS. 4, 10, 11, and 15) Japanese Patent Laid-Open No. 8-72656 (FIGS. 15 to 20)

上記のように、エアバッグの所望の展開特性を実現しつつ、製造コストを低減できるエアバッグ装置が求められている。   As described above, there is a demand for an airbag device that can reduce the manufacturing cost while realizing desired deployment characteristics of the airbag.

本発明は、このような点に鑑みなされたもので、所望の展開特性を実現しつつ、製造コストを低減できるエアバッグ装置及びエアバッグの折畳方法を提供することを目的とする。   This invention is made | formed in view of such a point, and it aims at providing the airbag apparatus and the folding method of an airbag which can reduce manufacturing cost, implement | achieving a desired expansion | deployment characteristic.

請求項1記載のエアバッグ装置は、ガスが流入して膨張展開するエアバッグと、前記エアバッグにガスを供給するインフレータと、前記エアバッグが非展開時に折り畳んで収納されるエアバッグ収納部及び展開時に前記エアバッグが突出する突出口を設けたケース体とを具備し、前記エアバッグは、非展開時において、ガスが導入される基端側が前記ケース体に接続された筒状の第1展開部と、この第1展開部の先端側の所定点から延設された複数の第2展開部を前記所定点側に集合させた集合部とを備えるとともに、前記第1展開部は、少なくとも一の第2展開部を突出口側に露出させた状態で、他の第2展開部に沿ってこの第2展開部の突出口側を覆う形状に巻き付けて折り畳まれたものである。   The airbag device according to claim 1 is an airbag that inflates and deploys when gas flows in, an inflator that supplies gas to the airbag, an airbag storage portion that is folded and stored when the airbag is not deployed, and A case body provided with a projecting opening through which the airbag projects during deployment, and the airbag has a cylindrical first end connected to the case body at a base end side where gas is introduced during non-deployment. An unfolding portion, and an aggregation portion in which a plurality of second unfolding portions extending from a predetermined point on the distal end side of the first unfolding portion are assembled on the predetermined point side, and the first unfolding portion includes at least In a state where one second developing portion is exposed to the protruding port side, the second developing portion is wound and folded along the other second developing portion so as to cover the protruding port side of the second developing portion.

そして、この構成では、折り畳まれケース体のエアバッグ収納部に収納されたエアバッグにガスが供給されると、このガスはまず第1展開部に導入され、第1展開部が巻き戻されるように展開し、集合部を所定の角度に回動させながら突出口から突出させる。続いて、ガスは、第1展開部を介して集合部を構成する各第2展開部に導入され、各第2展開部を展開させる。少なくとも一の第2展開部には第1展開部は巻き付けられず突出口側に露出した状態になっているため、この第2展開部は所定の方向に迅速に展開し、保護対象に加わる力を抑制しつつ迅速に展開する所望の展開特性を容易に実現できる。一部の第2展開部が迅速に展開するため、エアバッグの内圧の上昇が抑制され、エアバッグの構成の簡略化及びインフレータの選択の自由度が向上し、製造コストが低減される。   In this configuration, when the gas is supplied to the airbag that is folded and stored in the airbag storage portion of the case body, the gas is first introduced into the first deployment portion, and the first deployment portion is rewound. And the protruding portion is protruded from the protruding opening while rotating the collecting portion at a predetermined angle. Subsequently, the gas is introduced into each second developing unit that constitutes the collecting unit via the first developing unit to develop each second developing unit. Since the first deployment part is not wrapped around the at least one second deployment part and is exposed to the projecting opening, the second deployment part is rapidly deployed in a predetermined direction, and the force applied to the protection target It is possible to easily realize a desired deployment characteristic for rapid deployment while suppressing the above-described problem. Since some of the second deployment parts are rapidly deployed, an increase in the internal pressure of the airbag is suppressed, the configuration of the airbag is simplified, the degree of freedom in selecting the inflator is improved, and the manufacturing cost is reduced.

請求項2記載のエアバッグ装置は、請求項1記載のエアバッグ装置において、エアバッグは、非展開時において、2個の第2展開部が突出口に臨んで並べて配置されるとともに、第1展開部は、保護対象に対して奥側に位置する第2展開部に対して、基端側から奥側及び前記突出口側を介して先端部が前記基端側に向かう状態で前記奥側の第2展開部の外周部分に沿って配置されたものである。   The airbag device according to claim 2 is the airbag device according to claim 1, wherein when the airbag is not deployed, the two second deployment parts are arranged side by side facing the protruding opening, The deploying portion is located on the back side in a state in which the distal end portion is directed from the base end side to the back end side and the protruding port side toward the base end side with respect to the second deploying portion located on the back side with respect to the protection target It is arrange | positioned along the outer peripheral part of the 2nd expansion | deployment part.

そして、この構成では、奥側の第2展開部に略半回転した状態で第1展開部が巻き付けられ、第1展開部は略J字状になっている。そこで、エアバッグにガスが導入されると、この第1展開部が巻き戻されるように展開し、各第2展開部が保護対象に対して交差する方向に向かって展開する状態でケース体の突出口から突出させる。このため、保護対象に加わる力を抑制しつつ、迅速な展開が可能になる。   And in this structure, the 1st expansion | deployment part is wound in the state which carried out the substantially half rotation to the 2nd expansion | deployment part of the back | inner side, and the 1st expansion | deployment part is substantially J-shaped. Therefore, when gas is introduced into the airbag, the first deployment part is deployed so as to be rewound, and the second deployment part is deployed in a direction that intersects the protection target. Make it protrude from the protrusion. For this reason, rapid deployment is possible while suppressing the force applied to the protection target.

請求項3記載のエアバッグ装置は、請求項1または2記載のエアバッグ装置において、少なくとも突出口側に露出する第2展開部は、突出口に向かう方向に沿った方向を面方向とする波状に折り畳まれたものである。   The airbag device according to claim 3 is the airbag device according to claim 1 or 2, wherein at least the second deployment portion exposed on the side of the protruding port has a wave shape with a direction along the direction toward the protruding port as a surface direction. Folded into

そして、この構成では、突出口に向かう方向に沿った方向を面方向とする波状に折り畳むことにより、ガスが供給された際に、突出口側に円滑にガスを供給して上側部をまず膨張させ、この膨張が下側部に進行することにより、エアバッグに突出口から出ようとする傾向を持たせ、エアバッグを突出口から円滑に突出させることが可能になる。さらに、突出口から突出した後は、波状に折り畳まれた第2展開部が直線的に迅速に展開し、エアバッグの所望の最終的な展開形状を迅速に完成できる。   And in this structure, when the gas is supplied, the gas is smoothly supplied to the projecting port side, and the upper part is first expanded by folding it in a wave shape with the direction along the direction toward the projecting port as the surface direction. As the inflation proceeds to the lower side, the airbag has a tendency to come out from the protruding port, and the airbag can be smoothly protruded from the protruding port. Furthermore, after projecting from the projecting opening, the second deployed portion folded in a wave shape is rapidly deployed linearly, and the desired final deployed shape of the airbag can be quickly completed.

請求項4記載のエアバッグ装置は、請求項1ないし3いずれか一記載のエアバッグ装置において、インフレータは、燃焼によりガスを生成する燃焼型インフレ−タであるものである。   The airbag device according to claim 4 is the airbag device according to any one of claims 1 to 3, wherein the inflator is a combustion-type inflator that generates gas by combustion.

そして、この構成では、燃焼型インフレ−タを用いることにより、急峻な圧力上昇特性を活かして迅速な展開が可能になるとともに、製造コストの低減及び小形化が容易になる。   In this configuration, by using the combustion-type inflector, it is possible to rapidly develop by making use of the steep pressure rise characteristic, and it is easy to reduce the manufacturing cost and reduce the size.

請求項5記載のエアバッグの折畳方法は、ガス導入口からガスが流入して膨張展開するエアバッグの折畳方法であって、前記ガス導入口に連続する筒状の第1展開部と、この第1展開部の先端側の所定点から延設された複数の第2展開部とを形成する工程と、前記第2展開部を前記所定点側に集合させて集合部を形成する工程と、前記集合部を前記第1展開部のガス導入口側に対して回転させて、前記集合部を構成する第2展開部の一部のみに前記第1展開部を巻き付ける工程とを備えたものである。   The method for folding an airbag according to claim 5 is a method for folding an airbag that inflates and deploys when gas flows in from a gas introduction port, and includes a cylindrical first deployment part continuous to the gas introduction port; A step of forming a plurality of second expanding portions extending from a predetermined point on the tip side of the first expanding portion, and a step of forming the collecting portion by collecting the second expanding portions on the predetermined point side And rotating the collecting portion relative to the gas inlet side of the first developing portion and winding the first developing portion around only a part of the second developing portion constituting the collecting portion. Is.

そして、この構成では、折り畳まれたエアバッグにガスが供給されると、このガスはまず第1展開部に導入され、第1展開部が巻き戻されるように展開し、集合部を所定の角度に回動させながら突出させる。続いて、ガスは、第1展開部を介して集合部を構成する各第2展開部に導入され、各第2展開部を展開させる。第1展開部は一部の第2展開部にしか巻き付けられていないため、第2展開部を所定の方向に迅速に展開させ、保護対象に加わる力を抑制しつつ迅速に展開する所望の展開特性を容易に実現できる。一部の第2展開部が迅速に展開するため、エアバッグの内圧の上昇が抑制され、エアバッグの構成の簡略化及びインフレータの選択の自由度が向上し、製造コストが低減される。   In this configuration, when gas is supplied to the folded airbag, the gas is first introduced into the first deployment portion, and deployed so that the first deployment portion is rewound, and the assembly portion is set at a predetermined angle. Project while rotating. Subsequently, the gas is introduced into each second developing unit that constitutes the collecting unit via the first developing unit to develop each second developing unit. Since the first deploying portion is wound only around some second deploying portions, the second deploying portion can be rapidly deployed in a predetermined direction, and desired deployment can be performed quickly while suppressing the force applied to the protection target. The characteristics can be easily realized. Since some of the second deployment parts are rapidly deployed, an increase in the internal pressure of the airbag is suppressed, the configuration of the airbag is simplified, the degree of freedom in selecting the inflator is improved, and the manufacturing cost is reduced.

本発明によれば、エアバッグを所望の方向に迅速に展開させ、保護対象に加わる力を抑制しつつ迅速に展開する所望の展開特性を容易に実現できる。エアバッグの内圧の上昇を抑制できるため、エアバッグの構成の簡略化及びインフレータの選択の自由度が向上し、製造コストを低減できる。   ADVANTAGE OF THE INVENTION According to this invention, the desired deployment characteristic which deploys an airbag quickly in a desired direction, and deploys quickly, suppressing the force added to a protection object is easily realizable. Since the increase in the internal pressure of the airbag can be suppressed, the configuration of the airbag can be simplified and the degree of freedom in selecting the inflator can be improved, and the manufacturing cost can be reduced.

以下、本発明のエアバッグ装置及びエアバッグの折畳方法の一実施の形態を図面を参照して説明する。   Hereinafter, an embodiment of an airbag device and an airbag folding method of the present invention will be described with reference to the drawings.

図1において、1はエアバッグ装置で、このエアバッグ装置1は、自動車の助手席すなわち被保護物である助手席の乗員の前方に位置する被設置部としてのインストルメントパネル2の内側に配置され、助手席乗員用のエアバッグ装置1を構成している。なお、以下、前方(図1などに示す矢印F方向)、後方(図1に示す矢印R方向)、および上下方向は、それぞれエアバッグ装置1を自動車に取り付けた状態における自動車の前後方向および上下方向に合わせて説明する。そして、インストルメントパネル2は、後側すなわち助手席側に向かって若干下降する曲面状などに形成され、このインストルメントパネル2の内側に配置された被取付部材としてのステアリングメンバー3に、エアバッグ装置1が正面側を上方から若干後方に向けて傾斜した状態でねじ止めなどして固定されている。また、インストルメントパネル2の上方には、図8などに示すように、前側下方から上側後方に向かって傾斜したフロントガラス4が位置している。   In FIG. 1, reference numeral 1 denotes an airbag device. The airbag device 1 is disposed inside an instrument panel 2 as an installation portion located in front of an occupant of a passenger seat of a car, that is, a passenger seat to be protected. Thus, an airbag device 1 for a passenger on the passenger seat is configured. Hereinafter, the front (in the direction of arrow F shown in FIG. 1 and the like), the rear (the direction of arrow R shown in FIG. 1), and the up and down direction are respectively the front and rear direction and the up and down direction of the automobile with the airbag device 1 attached to the automobile. It explains according to the direction. The instrument panel 2 is formed in a curved surface or the like slightly descending toward the rear side, that is, the passenger seat side, and an airbag is attached to the steering member 3 as a mounted member disposed inside the instrument panel 2. The apparatus 1 is fixed by screwing or the like in a state where the front side is inclined slightly upward from the upper side. Further, as shown in FIG. 8 and the like, a windshield 4 inclined from the lower front side toward the upper rear side is located above the instrument panel 2.

そして、このエアバッグ装置1は、リアクションカンあるいはリテーナなどとも呼ばれる略箱状のケース体12と、このケース体12の内側に組み合わされるリテーナ14及びエアバッグ15と、このケース体12の外側から組み合わされる2個のインフレータ16及びブラケット17とを備えている。   The airbag device 1 is assembled from the outside of the case body 12 with a substantially box-shaped case body 12 also called a reaction can or a retainer, a retainer 14 and an airbag 15 combined inside the case body 12. Two inflators 16 and a bracket 17 are provided.

そして、ケース体12は、金属板を折曲しあるいは溶接などして形成され、ベース部12a、このベース部12aの前後から立ち上げられた前壁部12b及び後壁部12c、及び図示しない両側の側壁部を備え、正面側を開口部である突出口21とした略箱状をなし、ケース体12の内側には、エアバッグ収納部22が形成されている。そして、このエアバッグ収納部22に、袋状のエアバッグ15が折り畳んで収納されるとともに、突出口21は、リッドともよばれる破断可能なカバー体23により覆われている。   The case body 12 is formed by bending or welding a metal plate, the base portion 12a, the front wall portion 12b and the rear wall portion 12c raised from the front and rear of the base portion 12a, and both sides (not shown) The side wall portion is formed in a substantially box shape with the front side being a projecting opening 21 that is an opening, and an airbag housing portion 22 is formed inside the case body 12. A bag-like airbag 15 is folded and stored in the airbag storage portion 22, and the protruding port 21 is covered with a breakable cover body 23 called a lid.

また、ベース部12aには、円孔状をなすインフレータ取付孔12eが複数、本実施の形態では両側に対をなして形成されているとともに、各インフレータ取付孔12eを囲んで、それぞれ4カ所、合計8カ所に図示しない取付孔が形成されている。また、前壁部12b及び後壁部12cの外面には、断面略L字状などをなすカバー体取付片25,26が溶接あるいはリベットなどにより固定されている。   The base portion 12a has a plurality of circular inflator mounting holes 12e formed in pairs in the present embodiment on both sides, and surrounds each inflator mounting hole 12e. Mounting holes (not shown) are formed in a total of eight places. Further, cover body mounting pieces 25 and 26 having a substantially L-shaped cross section are fixed to the outer surfaces of the front wall portion 12b and the rear wall portion 12c by welding or rivets.

そして、リテーナ14は、例えば金属板を折曲して、基板部14aと、この基板部14aの外周部が上側に折曲された周板部14bとが形成されている。また、基板部14aには、2個のインフレータ取付孔14eが形成されているとともに、各インフレータ取付孔14eを囲んでそれぞれ4カ所、合計8カ所に下側に突出するスタッドボルト28が固着されている。また、各スタッドボルト28には、下方からナット29が螺合されるようになっている。   The retainer 14 is formed, for example, by bending a metal plate to form a substrate portion 14a and a peripheral plate portion 14b in which the outer peripheral portion of the substrate portion 14a is bent upward. In addition, two inflator mounting holes 14e are formed in the board portion 14a, and stud bolts 28 that protrude downward are fixed to four in total, each surrounding four inflator mounting holes 14e. Yes. A nut 29 is screwed onto each stud bolt 28 from below.

また、各インフレータ16は、ディスク状をなす本体部16aを備え、この本体部16aの外周面の上側部に、複数のガス噴射口16bが形成されている。また、本体部16aの外周部には、ガス噴射口16bの下方に位置して、板状のフランジ部16cが設けられ、このフランジ部16cには、四隅の近傍に位置して、取付孔が形成されている。そして、本体部16aの内部には、点火器及び硝酸アンモニウムなどを含む薬剤が収納され、底部に接続されたコネクタ30からの電気信号により、点火器が薬剤を燃焼させ、ガス噴射口16bからガスを急速に供給するようになっている。   Each inflator 16 includes a disk-shaped main body portion 16a, and a plurality of gas injection ports 16b are formed on the upper portion of the outer peripheral surface of the main body portion 16a. In addition, a plate-like flange portion 16c is provided on the outer peripheral portion of the main body portion 16a below the gas injection port 16b. The flange portion 16c has mounting holes located near the four corners. Is formed. The body portion 16a contains an igniter and a medicine containing ammonium nitrate, and the igniter burns the medicine by an electrical signal from the connector 30 connected to the bottom, and gas is discharged from the gas injection port 16b. It has come to supply rapidly.

そして、カバー体23は、例えばTPO(サーモプラスチックオレフィン)樹脂により、インストルメントパネル2の表皮の一部と一体的に構成され、略平板状の上板部23aと、この上板部23aの下面から下方に突設された前後の脚片部23b,23cなどを備えている。また、上板部23aの下面には、他の部分より薄肉で容易に破断する溝状の破断予定部(テアライン)23dが平面略H字状などに形成されている。   The cover body 23 is formed integrally with a part of the skin of the instrument panel 2 by, for example, TPO (thermoplastic olefin) resin, and has a substantially flat upper plate portion 23a and a lower surface of the upper plate portion 23a. The front and rear leg pieces 23b, 23c are provided so as to project downward from the front. Further, on the lower surface of the upper plate portion 23a, a groove-like breakable portion (tea line) 23d that is thinner and easier to break than other portions is formed in a substantially H-shaped plane.

また、エアバッグ15は、例えば2枚の基布を縫い合わせ、基端側に設けた一対の円孔状の開口部15aから乗員に対向する対向面15bに向かい幅寸法および厚さ寸法が拡大する袋状に形成されている。また、各開口部15aの周囲には、それぞれ4カ所、合計8カ所に取付孔が形成されている。   For example, the airbag 15 is stitched together with two base fabrics, and the width dimension and the thickness dimension increase from a pair of circular openings 15a provided on the base end side toward the facing surface 15b facing the occupant. It is formed in a bag shape. Further, around each opening 15a, there are four attachment holes, for a total of eight attachment holes.

そして、このエアバッグ装置1を組み立てる際は、まず、エアバッグ15内にリテーナ14を挿入し、リテーナ14のスタッドボルト28をエアバッグ15の取付孔に挿入して外側に引き出すことにより、開口部15aがインフレータ取付孔14eに位置合わせされる。この状態で、後述するようにエアバッグ15を折り畳み、スタッドボルト28に係止される基布製のラッピング31によりこの折畳形状を保持する。なお、このラッピング31には、図示しないミシン目などの弱部である破断予定部が形成され、エアバッグ15の展開時にはこの破断予定部に沿って破断することにより、エアバッグ15の拘束を解除し、エアバッグ15の展開挙動には影響を与えないようになっている。そして、この折り畳んだエアバッグ15を、ケース体12のエアバッグ収納部22に挿入し、スタッドボルト28をケース体12のベース部12aの取付孔に挿入する。そして、ケース体12の下方から、各インフレータ16の本体部16aをインフレータ取付孔12e,14e及び開口部15aに挿入するとともに、フランジ部16cの取付孔にスタッドボルト28を挿入する。さらに、各スタッドボルト28を、ブラケット17に設けた取付孔に挿入して、ナット29を締め付ける。この状態で、リテーナ14の基板部14aとナット29との間に、エアバッグ15、ラッピング31、ケース体12のベース部12a、インフレータ16のフランジ部16c、及びブラケット17が重ねて締め付け固定される。さらに、カバー体23の脚片部23b,23cをボルト33などを用いてケース体12のカバー体取付片25,26に取り付け、上板部23aで突出口21を覆って、エアバッグ装置1が構成される。そして、ブラケット17を、ステアリングメンバー3に溶接された取付座3aにボルト35で固定して、エアバッグ装置1が車体に固定されている。   When the airbag device 1 is assembled, first, the retainer 14 is inserted into the airbag 15, and the stud bolt 28 of the retainer 14 is inserted into the mounting hole of the airbag 15 and pulled out to the outside. 15a is aligned with the inflator mounting hole 14e. In this state, the airbag 15 is folded as will be described later, and this folded shape is held by a wrapping 31 made of a base fabric locked to the stud bolt 28. The wrapping 31 is formed with a planned rupture portion which is a weak portion such as a perforation (not shown). When the airbag 15 is deployed, the rupture is broken along the planned rupture portion, thereby releasing the restraint of the airbag 15. However, the deployment behavior of the airbag 15 is not affected. Then, the folded airbag 15 is inserted into the airbag housing portion 22 of the case body 12, and the stud bolt 28 is inserted into the mounting hole of the base portion 12a of the case body 12. Then, from below the case body 12, the main body portion 16a of each inflator 16 is inserted into the inflator mounting holes 12e and 14e and the opening 15a, and the stud bolt 28 is inserted into the mounting hole of the flange portion 16c. Further, each stud bolt 28 is inserted into a mounting hole provided in the bracket 17 and the nut 29 is tightened. In this state, the airbag 15, the wrapping 31, the base portion 12a of the case body 12, the flange portion 16c of the inflator 16, and the bracket 17 are overlapped and fixed between the base plate portion 14a of the retainer 14 and the nut 29. . Further, the leg piece portions 23b and 23c of the cover body 23 are attached to the cover body attachment pieces 25 and 26 of the case body 12 using bolts 33 or the like, and the protrusion 21 is covered with the upper plate portion 23a. Composed. The bracket 17 is fixed to the mounting seat 3a welded to the steering member 3 with bolts 35, and the airbag device 1 is fixed to the vehicle body.

そして、このように構成されたエアバッグ装置1は、自動車の衝突などの際には、通常、図示しないコントローラがこの衝撃すなわち所定以上の急減速を検出してインフレータ16を作動させ、このインフレータ16からガスを噴射させる。すると、このガスは、エアバッグ15の内部に流入して、このエアバッグ15を膨張展開させる。すると、このエアバッグ15は、カバー体23を内側から押圧し、このカバー体23の上板部23aを破断予定部23dに沿って破断して扉状に開き、エアバッグ15の突出口を形成する。続いて、エアバッグ15は、この突出口から突出し、後述するように膨張展開して、乗員に加わる衝撃を緩和するようになっている。   In the airbag apparatus 1 configured as described above, in the event of a collision of an automobile, a controller (not shown) normally detects this impact, that is, a sudden deceleration more than a predetermined value, and operates the inflator 16. The gas is jetted from. Then, the gas flows into the airbag 15 and inflates and deploys the airbag 15. Then, the airbag 15 presses the cover body 23 from the inside, and the upper plate portion 23a of the cover body 23 is broken along the planned breakage portion 23d to open in a door shape, thereby forming a protruding opening of the airbag 15. To do. Subsequently, the airbag 15 projects from the projecting opening and is inflated and deployed as will be described later so as to alleviate the impact applied to the occupant.

次に、図1ないし図5を参照して、エアバッグ15の折畳形状及び折畳工程を説明する。   Next, the folding shape and folding process of the airbag 15 will be described with reference to FIGS.

このエアバッグ15の折畳形状は、図1及び図5に示すように、第1展開部51と、集合部52とに概略分けて定義される密な折りが施されている。そして、第1展開部51は、開口部15aを含みリテーナ14とケース体12のベース部12aとに挟持される基部54と、この基部54からケース体12の前壁部12bの内側に沿って上方に延びる前部55と、この前部55が後側に屈曲するコーナー部56と、このコーナー部56から後方に伸びる上部57と、この上部57が下方に屈曲するコーナー部58と、このコーナー部58から仮想線である所定点60まで下方に伸びる先端部59とを有している。一方、集合部52は、複数の第2展開部からなり、本実施の形態では、第2展開部としての上側展開部61と、第2展開部としての下側展開部62とを備えている。そして、下側展開部62は、折り畳んだ状態で上側展開部61の前側に位置し、この下側展開部62のみに、第1展開部51が巻き付けられた状態になっている。すなわち、第1展開部51の先端部59は、上側展開部61と下側展開部62との間に入り込むようにして配置されている。さらに、上側展開部61は、先端側から基端側まで波状に折り畳まれたいわば単純波形としているのに対し、下側展開部62は、先端側は波状に折り畳まれている一方、基端側が波状の部分に巻き付けるように折り畳まれたいわばS字波型としている。また、上側展開部61及び下側展開部62の波形に折り畳んだ部分は、第1展開部51の先端部59の延設方向に沿って配置されている。   As shown in FIGS. 1 and 5, the folded shape of the airbag 15 is subjected to a dense fold that is roughly divided into a first deployment portion 51 and a collecting portion 52. The first deployment portion 51 includes an opening 15a, a base 54 that is sandwiched between the retainer 14 and the base portion 12a of the case body 12, and the base 54 along the inside of the front wall portion 12b of the case body 12. A front portion 55 extending upward, a corner portion 56 where the front portion 55 is bent rearward, an upper portion 57 extending rearward from the corner portion 56, a corner portion 58 where the upper portion 57 is bent downward, and the corner A tip portion 59 extending downward from the portion 58 to a predetermined point 60 which is an imaginary line. On the other hand, the gathering unit 52 includes a plurality of second developing units, and in the present embodiment, includes an upper developing unit 61 as a second developing unit and a lower developing unit 62 as a second developing unit. . The lower development part 62 is positioned in front of the upper development part 61 in a folded state, and the first development part 51 is wound around only the lower development part 62. That is, the distal end portion 59 of the first deployment portion 51 is disposed so as to enter between the upper deployment portion 61 and the lower deployment portion 62. Furthermore, the upper development part 61 has a simple waveform that is folded in a wave shape from the distal end side to the proximal end side, whereas the lower deployment part 62 is folded in a wave shape on the distal end side while the proximal end side is It is a so-called S-shaped wave shape that is folded so as to be wound around a wavy portion. In addition, the folded portions of the upper deployment portion 61 and the lower deployment portion 62 are disposed along the extending direction of the distal end portion 59 of the first deployment portion 51.

そして、このエアバッグ15の折畳工程は、まず、リテーナ14に取り付けたエアバッグ15を上側に引き出しあるいは膨らませた状態から、図2に示すように、エアバッグ15の側面部を内方に寄せて入れ込み、側面視略T字状とする。この状態で、エアバッグ15に、完成した状態で第1展開部51と集合部52となる部分にそれぞれ相当する箇所が現れる。すなわち、リテーナ14から立ち上げられた筒状の部分が第1展開部51となり、仮想線である所定点60を中心に前後に延設された部分がそれぞれ上側展開部61及び下側展開部62となる。   Then, in the folding process of the airbag 15, first, the side surface of the airbag 15 is moved inward as shown in FIG. 2 from the state in which the airbag 15 attached to the retainer 14 is pulled out or inflated. Into a substantially T-shape in side view. In this state, portions corresponding to the portions that become the first deployment portion 51 and the gathering portion 52 in the completed state appear in the airbag 15. That is, the cylindrical portion raised from the retainer 14 becomes the first deployment portion 51, and the portions extending back and forth around the predetermined point 60 that is an imaginary line are the upper deployment portion 61 and the lower deployment portion 62, respectively. It becomes.

次いで、図3に示すように、所定点60を中心に、集合部52の上面を互いに向き合わせるように折り、本実施の形態では、上側展開部61の上に下側展開部62を重ね、第1展開部51とともに平面上に延ばして配置する。   Next, as shown in FIG. 3, the upper surface of the assembly portion 52 is folded so as to face each other around the predetermined point 60, and in the present embodiment, the lower development portion 62 is overlaid on the upper development portion 61, The first development part 51 is disposed so as to extend on a plane.

次いで、図4に示すように、上側展開部61及び下側展開部62を所定点60に向けて集合するように折り畳み、集合部52を形成する。本実施の形態では、上記のように、上側展開部61を単純波形に折り、下側展開部62をS字波型に折る。   Next, as shown in FIG. 4, the upper unfolding portion 61 and the lower unfolding portion 62 are folded toward the predetermined point 60 to form the collecting portion 52. In the present embodiment, as described above, the upper developed part 61 is folded into a simple waveform, and the lower developed part 62 is folded into an S-shaped waveform.

次いで、図5に示すように、この集合部52を矢印C方向(車体の左側から見て右巻き方向)に巻き、すなわち、下側展開部62の外周に約180度だけ第1展開部51を巻き付け、さらに、図6に示すように、矢印D方向(車体の左側から見て右巻き方向)に巻いて集合部52をリテーナ14上に載せるようにして、最終折畳形状とする。   Next, as shown in FIG. 5, the gathering portion 52 is wound in the direction of arrow C (right-handed direction when viewed from the left side of the vehicle body), that is, the first unfolding portion 51 is rotated about 180 degrees around the outer periphery of the lower unfolding portion 62. Further, as shown in FIG. 6, the folded portion is wound in the direction of arrow D (the right-handed direction as viewed from the left side of the vehicle body) so that the collecting portion 52 is placed on the retainer 14 to obtain a final folded shape.

そして、このエアバッグ15の展開工程は、図7(a)に示すように、折り畳んで収納された状態で、エアバッグ15内にガスが供給されると、このガスは、まず、第1展開部51に供給され、集合部52が矢印E方向に起き上がるように回動しながらカバー体23を破断してケース体12から突出する。そして、図7(b)に示すように、集合部52がわずかに約90度回動した状態で、集合部52にガスが供給され、上側展開部61及び下側展開部62の展開が開始される。すなわち、エアバッグ15の内圧の過度の上昇が抑制される。そして、単純波形に折られた上側展開部61は、S字波型に折られた下側展開部62よりも通気抵抗が小さく、優先的にガスが供給され、保護対象である乗員に対して所定の角度(水平面に対して角度θ)をなす交差方向であるG方向に直線的に迅速に最終展開形状へと展開する。一方、下側展開部62は、上側展開部61に僅かに遅れて展開する。ここで、下側展開部62は、上側展開部61の展開方向と反対方向のJ方向に向かうとともに、矢印K方向に向かう回転動作が加わり、図8に示すように、インストルメントパネル2の面に沿ってインストルメントパネル2とダミーMで示す乗員の腹部との間に入り込むように展開させることができる。   Then, as shown in FIG. 7 (a), when the gas is supplied into the airbag 15 in a state where the airbag 15 is folded and accommodated, the gas is first expanded as shown in FIG. The cover body 23 is broken and protrudes from the case body 12 while being rotated so that the gathering section 52 rises in the direction of arrow E. Then, as shown in FIG. 7 (b), the gas is supplied to the collecting portion 52 in a state where the collecting portion 52 is rotated by about 90 degrees, and the expansion of the upper developing portion 61 and the lower developing portion 62 is started. Is done. That is, an excessive increase in the internal pressure of the airbag 15 is suppressed. And the upper deployment part 61 folded into a simple waveform has a lower ventilation resistance than the lower deployment part 62 folded into an S-shaped waveform, and is preferentially supplied with gas to protect the passengers to be protected. It develops linearly and rapidly into a final developed shape in the G direction, which is a crossing direction that forms a predetermined angle (angle θ with respect to the horizontal plane). On the other hand, the lower development part 62 develops slightly behind the upper development part 61. Here, the lower development part 62 is directed to the J direction opposite to the development direction of the upper development part 61 and is subjected to a rotation operation in the direction of the arrow K. As shown in FIG. Can be deployed so as to enter between the instrument panel 2 and the abdomen of the occupant indicated by the dummy M.

図9に、本実施の形態のエアバッグ15の展開挙動を高速写真で撮影した実験結果を示す。   FIG. 9 shows experimental results obtained by taking a high-speed photograph of the deployment behavior of the airbag 15 of the present embodiment.

この実験では、ダミーMは米国人の6歳児の典型的な体型に相当するものであるAC06型を使用し、上段から順に、(a)〜(f)及び(g)〜(l)はそれぞれガスの噴射後0〔msec〕、20〔msec〕、30〔msec〕、50〔msec〕、60〔msec〕、及び100〔msec〕の状態を示している。また、右列と左列のは同じ時点を異なる方向から見たものであり、すなわち、(a)と(g)とは共に0〔msec〕の状態を示している。   In this experiment, the dummy M uses the AC06 type, which is a typical figure of a 6-year-old American, and (a) to (f) and (g) to (l) are respectively in order from the top. The states of 0 [msec], 20 [msec], 30 [msec], 50 [msec], 60 [msec], and 100 [msec] after gas injection are shown. Further, the right column and the left column are the same time points seen from different directions, that is, both (a) and (g) indicate a state of 0 [msec].

この実験の結果、展開初期における(20〔msec〕)エアバッグ15の下端が既に肩からかなり下の胸の位置まで到達していることがわかる。50〔msec〕前後の時間帯では、ダミーMに向かう突出量はほとんど増加せず、専ら下肢に向かってエアバッグ15が拡大しているのがわかる。そして、100〔msec〕におけるダミーMの後傾角度を小さい角度に維持できることがわかる。さらに、エアバッグ15が損傷を受けることもないことがわかる。   As a result of this experiment, it can be seen that the lower end of the airbag 15 at the initial deployment stage (20 [msec]) has already reached the chest position considerably below the shoulder. It can be seen that in the time zone around 50 [msec], the amount of protrusion toward the dummy M hardly increases, and the airbag 15 expands exclusively toward the lower limbs. It can be seen that the rearward tilt angle of the dummy M at 100 [msec] can be maintained at a small angle. Further, it can be seen that the airbag 15 is not damaged.

このように、本実施の形態によれば、素早い立ち上がり特性を持つ燃焼型のインフレ−タ16を用いつつ、エアバッグ15に加わる負荷を少なくし、コストを低減しつつ乗員保護性能に優れるエアバッグ装置1を提供できる。   As described above, according to the present embodiment, while using the combustion type inflator 16 having quick rising characteristics, the load applied to the airbag 15 is reduced, and the airbag has excellent occupant protection performance while reducing the cost. The apparatus 1 can be provided.

すなわち、エアバッグ15は、非展開時において、ケース体12に基端側が接続されガスが導入される筒状の第1展開部51と、この第1展開部51の先端側の所定点60から延設された複数の第2展開部61,62を所定点60側に集合させた集合部52とを備え、折り畳まれた第1展開部51は、ケース体12の側部(前壁部12b)内側を経由するように集合部52の外周側に添付され、この集合部52の中を通って基端側に向かう延設部(先端部59)が形成されるようにケースに収納される構成であり、2個の第2展開部61,62により集合部52を形成するとともに、この集合部52の一部のみに第1展開部51を沿わせ、本実施の形態では、保護対象である乗員の奥側に位置する下側展開部62にのみ巻き付けるように第1展開部51を配置したため、展開初期には、第1展開部51に入ったガスにより、集合部52を前方すなわち反乗員側に起き上がらせ、迅速にエアバッグ15をケース体12から外に出すことができる。このように、インフレ−タ16からのガスが間髪を入れずに「起き上がり」へと作用するため、エアバッグ15の内圧を著しく上昇させることなく、カバー体23の扉を速やかに開口させることができる。すなわち、第1展開部51は集合部52の間を通って所定点60である第1展開部51の端末まで達するように逆J字状に折り畳まれ、ガスの導入を受け真っ直ぐになろうとするから、集合部52をケース体12の外へいわば迅速に放り出すことができる。   That is, when the airbag 15 is not deployed, the airbag 15 includes a cylindrical first deployment portion 51 to which the base end side is connected to the case body 12 and gas is introduced, and a predetermined point 60 on the distal end side of the first deployment portion 51. A plurality of extended second unfolding portions 61 and 62 are assembled on the predetermined point 60 side, and the folded first unfolding portion 51 is a side portion of the case body 12 (the front wall portion 12b). ) Attached to the outer peripheral side of the collecting portion 52 so as to pass through the inside, and is housed in the case so as to form an extending portion (tip portion 59) extending through the collecting portion 52 toward the proximal end side. In the present embodiment, the second expanding portions 61 and 62 form a collecting portion 52, and the first expanding portion 51 is provided along only a part of the collecting portion 52. Since the first deployment part 51 is arranged so as to be wound only on the lower development part 62 located on the back side of a certain occupant, at the initial stage of deployment, the gas that has entered the first deployment part 51 Ri causes Okiagara the collecting portion 52 to the forward or counter-occupant side, can be quickly put out the air bag 15 from the case body 12. As described above, since the gas from the inflector 16 acts to “get up” without putting a gap, it is possible to quickly open the door of the cover body 23 without significantly increasing the internal pressure of the airbag 15. it can. That is, the first expansion part 51 is folded in an inverted J shape so as to reach the terminal of the first expansion part 51 which is the predetermined point 60 through the gathering part 52, and tries to be straightened by the introduction of gas. Therefore, the collecting portion 52 can be quickly thrown out of the case body 12.

さらに、第1展開部51の先端側は下向きになっているから、真っ直ぐになろうとする動きの間、常に所定点60は逆J字状の第1展開部51に対して下を向いている。そこで、第1展開部51が膨らむ過程で集合部52を乗員に対して交差する方向に向ける。したがって、いわゆる近接展開の場合でも、乗員に対して最も衝撃を与える可能性の少ない展開過程を取ることができる。   Furthermore, since the front end side of the first deployment part 51 is directed downward, the predetermined point 60 is always directed downward with respect to the inverted J-shaped first deployment part 51 during the movement to be straightened. . Therefore, in the process in which the first deployment part 51 swells, the assembly part 52 is directed in a direction intersecting the occupant. Therefore, even in the case of so-called proximity deployment, it is possible to take a deployment process with the least possibility of impacting the passenger.

また、上側展開部61の全部及び下側展開部62の大部分を、上下方向に沿った方向を面方向とする、いわば縦折りの波形に折り畳んだため、ケース体12でガスが供給された状態で、突出口21側に円滑にガスを供給して上側部をまず膨張させ、この膨張が下側部に進行することにより、エアバッグ15に突出口21から出ようとする傾向を持たせ、エアバッグ15を突出口21から円滑に突出させることができる。さらに、突出口21から突出した後は、波状に折り畳まれた上側展開部61が直線的に迅速に展開し、エアバッグ15の所望の最終的な展開形状を迅速に完成できる。   Further, since all of the upper development part 61 and most of the lower development part 62 are folded in a so-called vertical folding waveform with the direction along the vertical direction as the plane direction, gas is supplied from the case body 12. In this state, the gas is smoothly supplied to the protruding port 21 side to inflate the upper side first, and this expansion proceeds to the lower side, thereby causing the airbag 15 to have a tendency to exit the protruding port 21. The airbag 15 can be smoothly protruded from the protrusion 21. Furthermore, after projecting from the projecting port 21, the upper deployed part 61 folded in a wave shape is rapidly deployed linearly, and the desired final deployed shape of the airbag 15 can be quickly completed.

さらに、集合部52を構成する第2展開部としての上側展開部61及び下側展開部62を完全同一の折り方にせず、折り方を互いに異ならしたため、温度条件や衝突の角度、速度等の条件にかかわらず、展開時の複数の第2展開部の展開の順序及び挙動を安定して一定に制御することができる。すなわち、単純波形とした上側展開部61に先行して展開する傾向を持たせ、優先的にガスが入れることができる。すなわち、僅かながらS字波形に折られた下側展開部62を、上側展開部61に続いて展開させることができる。このようにして、第1展開部51及び集合部52の膨らむタイミングを安定して制御できる。さらに、S字波形に折られた下側展開部62については、回転動作が加わり、インストルメントパネル2の面に沿ってインストルメントパネル2と乗員の腹部との間に入り込むように展開させることができる。   In addition, the upper development part 61 and the lower development part 62 as the second development part constituting the gathering part 52 are not completely the same folding method, but the folding methods are different from each other, so that the temperature condition, the collision angle, the speed, etc. Regardless of the conditions, the order and behavior of the development of the plurality of second development parts during development can be controlled stably and constantly. That is, the gas can be preferentially introduced by giving a tendency to develop the upper development part 61 having a simple waveform in advance. That is, the lower development part 62 slightly folded into an S-shaped waveform can be developed following the upper development part 61. In this way, it is possible to stably control the swell timing of the first expanding portion 51 and the collecting portion 52. Further, the lower unfolding portion 62 folded into an S-shaped waveform is rotated so that it can be unfolded so as to enter between the instrument panel 2 and the abdomen of the occupant along the surface of the instrument panel 2. it can.

また、上記のように、エアバッグ15の内圧の過度の上昇を抑制できるため、エアバッグ15に厳重な補強を施す必要がなく、また、圧力上昇特性を制限することなく、急峻な圧力上昇特性を実現できる安価な燃焼型のインフレータ16を用いて近接展開にも対応可能な好ましい展開特性を実現することができ、製造コストを低減できる。   In addition, as described above, excessive increase in the internal pressure of the airbag 15 can be suppressed, so that it is not necessary to strictly reinforce the airbag 15, and the pressure increase characteristic is steep without limiting the pressure increase characteristic. By using an inexpensive combustion-type inflator 16 capable of realizing the above, it is possible to realize a preferable deployment characteristic that can cope with close deployment, and to reduce the manufacturing cost.

また、複数のインフレ−タを用いる構成では、少なくとも1つのインフレ−タの立ち上がりが早くないと、必要な特性が得られず、エアバッグ装置が成立しない場合もあるが、燃焼型のインフレータ16を用いることにより、複数のインフレ−タ16を用いるエアバッグ装置1を容易に実現できる。そして、複数の円盤形のインフレ−タ16を用いることにより、エアバッグ装置1の高さ寸法を抑制し、エアバッグ装置1を薄型化できるとともに、時間差を付けて起動するなどの制御を行うことにより、所望の展開特性を容易に実現できる。   Further, in the configuration using a plurality of inflators, if at least one of the inflators does not rise quickly, necessary characteristics cannot be obtained, and the airbag device may not be established. By using it, the airbag apparatus 1 using a plurality of inflators 16 can be easily realized. Then, by using a plurality of disk-shaped inflators 16, the height of the airbag device 1 can be suppressed, the airbag device 1 can be thinned, and control such as activation with a time difference is performed. Thus, desired development characteristics can be easily realized.

また、折畳工程も複雑なものではなく、製造コストの低減が可能になる。   Further, the folding process is not complicated, and the manufacturing cost can be reduced.

また、上記のように、近接展開に対しても好ましい展開挙動を実現できるため、助手席用のエアバッグ装置1の動作を停止させるいわゆるカットオフスイッチなどの複雑な装置を必要としない構成を実現できる。   Further, as described above, since a preferable deployment behavior can be realized even in the proximity deployment, a configuration that does not require a complicated device such as a so-called cut-off switch for stopping the operation of the airbag device 1 for the passenger seat is realized. it can.

なお、上記の実施の形態では、2方向に延設した第2展開部61,62を波状に折り畳む構成としたが、3方向以上の複数方向に第2展開部を突設し、これら第2展開部により所定点を中心に集合部を形成し、この集合部の間に第1展開部の一部を配置し、かつ、第1展開部の他の部分は集合部の外周部の一部のみに沿って添付することができる。また、各第2展開部は、波状の折り畳みのほか、巻き付け、あるいは単に所定点60側に圧縮するようにして略波状に折り畳むこともできる。   In the above-described embodiment, the second expanding portions 61 and 62 extending in two directions are folded in a wave shape. However, the second expanding portions protrude in plural directions of three or more directions, and the second An unfolding part forms a gathering part around a predetermined point, a part of the first unfolding part is arranged between the gathering parts, and another part of the first unfolding part is a part of the outer peripheral part of the gathering part Can only be attached along. In addition to the wave-like folding, each of the second expanding portions can be folded or substantially folded so as to be compressed toward the predetermined point 60 side.

また、第1展開部51および第2展開部61,62を形成する工程は、エアバッグ15を側面部から押圧して内側に折り込むほか、外側に折り重ねるなど種々の方法で所定の幅寸法とすることができる。   In addition, the step of forming the first deployment portion 51 and the second deployment portions 61 and 62 includes a predetermined width dimension by various methods such as pressing the airbag 15 from the side surface portion and folding the airbag 15 inside or folding it outside. can do.

また、上記の各実施の形態において、2方向などに延設した第2展開部61,62は、互いに等しい長さ寸法に形成するほか、偏心させ、すなわち互いに異なる長さ方向として、所望の展開形状、展開特性を容易に得ることができる。   Further, in each of the above-described embodiments, the second development portions 61 and 62 extending in two directions or the like are formed to have the same length, and are eccentric, i.e., in different length directions, the desired development. Shape and development characteristics can be easily obtained.

また、インフレータは、2個のインフレータを用いるいわゆるデュアルインフレ−タに限られず、1個のインフレータのみを用いても良く、あるいは、3個以上などの複数のインフレータを用いるマルチインフレ−タとすることもできる。   Further, the inflator is not limited to a so-called dual inflator using two inflators, but may use only one inflator, or a multi-inflator using a plurality of inflators such as three or more. You can also.

また、インフレータの特性によっては、燃焼型のインフレータに代えて、あるいは、燃焼型のインフレータとともに、圧縮ガス容器の封印を開放してガスを噴射するインフレータ、例えば、ガスの全部を貯蔵ガスでまかなうストレージタイプや、ガスの主要部を貯蔵ガスでまかなうハイブリッドタイプのインフレータを用いることもできる。   Also, depending on the characteristics of the inflator, an inflator that opens the compressed gas container and injects gas instead of the combustion type inflator or together with the combustion type inflator, for example, storage that covers all of the gas with stored gas It is also possible to use a hybrid inflator that covers the main part of the gas with the stored gas.

本発明は、助手席乗員用のインストルメントパネルに備えるエアバッグ装置の他、ドアパネルに備えるエアバッグ装置や、前席の背面に備える後席用のエアバッグ装置など、種々のエアバッグ装置に適用することができる。   INDUSTRIAL APPLICABILITY The present invention is applied to various airbag devices such as an airbag device provided in a door panel, a rear seat airbag device provided on the back of a front seat, in addition to an airbag device provided in an instrument panel for a passenger on the passenger seat. can do.

本発明のエアバッグ装置の一実施の形態を示す断面図である。It is sectional drawing which shows one Embodiment of the airbag apparatus of this invention. 同上エアバッグ装置のエアバッグの折り畳み工程を示す斜視図である。It is a perspective view which shows the folding process of the airbag of an airbag apparatus same as the above. 同上エアバッグ装置の図2に続く折り畳み工程を示す説明図であり、(a)は斜視図、(b)は(a)のI−I断面図である。It is explanatory drawing which shows the folding process following FIG. 2 of an airbag apparatus same as the above, (a) is a perspective view, (b) is II sectional drawing of (a). 同上エアバッグ装置の図3に続く折り畳み工程を示す説明図であり、(a)は斜視図、(b)は(a)のII−II断面図である。It is explanatory drawing which shows the folding process following FIG. 3 of an airbag apparatus same as the above, (a) is a perspective view, (b) is II-II sectional drawing of (a). 同上エアバッグ装置の図4に続く折り畳み工程を示す断面図である。It is sectional drawing which shows the folding process following FIG. 4 of an airbag apparatus same as the above. 同上エアバッグ装置の図5に続く折り畳み工程を示す断面図である。It is sectional drawing which shows the folding process following FIG. 5 of an airbag apparatus same as the above. 同上エアバッグ装置のエアバッグの展開過程を示す説明図であり、(a)は初期状態、(b)は(a)に続く状態である。It is explanatory drawing which shows the expansion | deployment process of the airbag of an airbag apparatus same as the above, (a) is an initial state, (b) is a state following (a). 同上エアバッグ装置の展開状態を示す説明図である。It is explanatory drawing which shows the expansion | deployment state of an airbag apparatus same as the above. 同上エアバッグ装置の実験結果を示す説明図である。It is explanatory drawing which shows the experimental result of an airbag apparatus same as the above.

符号の説明Explanation of symbols

1 エアバッグ装置
12 ケース体
15 エアバッグ
16 インフレータ
21 突出口
22 エアバッグ収納部
51 第1展開部
52 集合部
60 所定点
61 第2展開部としての上側展開部
62 第2展開部としての下側展開部
1 Airbag device
12 Case body
15 airbag
16 Inflator
21 Protrusion
22 Airbag compartment
51 First Development Department
52 Meeting part
60 Predetermined points
61 Upper development part as second development part
62 Lower deployment section as second deployment section

Claims (5)

ガスが流入して膨張展開するエアバッグと、
前記エアバッグにガスを供給するインフレータと、
前記エアバッグが非展開時に折り畳んで収納されるエアバッグ収納部及び展開時に前記エアバッグが突出する突出口を設けたケース体とを具備し、
前記エアバッグは、非展開時において、ガスが導入される基端側が前記ケース体に接続された筒状の第1展開部と、この第1展開部の先端側の所定点から延設された複数の第2展開部を前記所定点側に集合させた集合部とを備えるとともに、前記第1展開部は、少なくとも一の第2展開部を突出口側に露出させた状態で、他の第2展開部に沿ってこの第2展開部の突出口側を覆う形状に巻き付けて折り畳まれた
ことを特徴とするエアバッグ装置。
An air bag inflating and deploying gas,
An inflator for supplying gas to the airbag;
An airbag storage portion that is folded and stored when the airbag is not deployed, and a case body provided with a projecting opening from which the airbag projects when deployed.
The non-deployed airbag has a cylindrical first deploying portion in which a base end side into which gas is introduced is connected to the case body and a predetermined point on the distal end side of the first deploying portion. A plurality of second expanding portions that are assembled to the predetermined point side, and the first expanding portion is in a state where at least one second expanding portion is exposed to the protruding port side, The airbag apparatus is characterized by being wound and folded along a shape that covers the protruding opening side of the second deployment portion along the two deployment portions.
エアバッグは、非展開時において、
2個の第2展開部が突出口に臨んで並べて配置されるとともに、第1展開部は、保護対象に対して奥側に位置する第2展開部に対して、基端側から奥側及び前記突出口側を介して先端部が前記基端側に向かう状態で前記奥側の第2展開部の外周部分に沿って配置された
ことを特徴とする請求項1記載のエアバッグ装置。
The airbag is not deployed,
The two second developing portions are arranged side by side facing the protruding port, and the first developing portion is located on the back side from the base end side with respect to the second developing portion located on the back side with respect to the protection target. 2. The airbag device according to claim 1, wherein the airbag device is disposed along an outer peripheral portion of the second deployment portion on the back side in a state in which a distal end portion is directed toward the proximal end side through the protruding port side.
少なくとも突出口側に露出する第2展開部は、突出口に向かう方向に沿った方向を面方向とする波状に折り畳まれた
ことを特徴とする請求項1または2記載のエアバッグ装置。
The airbag device according to claim 1 or 2, wherein at least the second deployment portion exposed to the protruding port side is folded into a wave shape having a surface direction in a direction along the direction toward the protruding port.
インフレータは、燃焼によりガスを生成する燃焼型インフレ−タである
ことを特徴とする請求項1ないし3いずれか一記載のエアバッグ装置。
The airbag device according to any one of claims 1 to 3, wherein the inflator is a combustion-type inflator that generates gas by combustion.
ガス導入口からガスが流入して膨張展開するエアバッグの折畳方法であって、
前記ガス導入口に連続する筒状の第1展開部と、この第1展開部の先端側の所定点から延設された複数の第2展開部とを形成する工程と、
前記第2展開部を前記所定点側に集合させて集合部を形成する工程と、
前記集合部を前記第1展開部のガス導入口側に対して回転させて、前記集合部を構成する第2展開部の一部のみに前記第1展開部を巻き付ける工程と
を備えたことを特徴とするエアバッグの折畳方法。
A method for folding an airbag in which gas flows from a gas inlet and inflates and deploys,
Forming a cylindrical first development part continuous to the gas inlet and a plurality of second development parts extending from a predetermined point on the tip side of the first development part;
A step of assembling the second expanding portion on the predetermined point side to form a collecting portion;
Rotating the collecting part relative to the gas inlet side of the first developing part and winding the first developing part around only a part of the second developing part constituting the collecting part. A method for folding an airbag.
JP2004101576A 2004-03-30 2004-03-30 Airbag device and airbag folding method Expired - Fee Related JP4376677B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007190991A (en) * 2006-01-18 2007-08-02 Toyota Motor Corp Airbag device for vehicle
JP2012071716A (en) * 2010-09-29 2012-04-12 Toyoda Gosei Co Ltd Airbag device
JP2013544999A (en) * 2010-12-09 2013-12-19 テン・ケイト・ネーデルランド・ビー.ブイ. Artificial grass
JP2019142258A (en) * 2018-02-16 2019-08-29 日本プラスト株式会社 Airbag device
CN113386700A (en) * 2020-03-13 2021-09-14 奥托立夫开发公司 Method for manufacturing airbag device and airbag device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007190991A (en) * 2006-01-18 2007-08-02 Toyota Motor Corp Airbag device for vehicle
JP4492546B2 (en) * 2006-01-18 2010-06-30 トヨタ自動車株式会社 Airbag device for vehicle
JP2012071716A (en) * 2010-09-29 2012-04-12 Toyoda Gosei Co Ltd Airbag device
US8517415B2 (en) 2010-09-29 2013-08-27 Toyoda Gosei Co., Ltd. Airbag apparatus
JP2013544999A (en) * 2010-12-09 2013-12-19 テン・ケイト・ネーデルランド・ビー.ブイ. Artificial grass
JP2019142258A (en) * 2018-02-16 2019-08-29 日本プラスト株式会社 Airbag device
JP7053301B2 (en) 2018-02-16 2022-04-12 日本プラスト株式会社 Airbag device
CN113386700A (en) * 2020-03-13 2021-09-14 奥托立夫开发公司 Method for manufacturing airbag device and airbag device
CN113386700B (en) * 2020-03-13 2023-01-31 奥托立夫开发公司 Method for manufacturing airbag device and airbag device

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