JP3741052B2

JP3741052B2 - Airbag device for side impact of automobile

Info

Publication number: JP3741052B2
Application number: JP2002037050A
Authority: JP
Inventors: 倫明岡部
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2002-02-14
Filing date: 2002-02-14
Publication date: 2006-02-01
Anticipated expiration: 2022-02-14
Also published as: JP2003237526A

Description

【０００１】
【発明の属する技術分野】
この発明は、自動車の側突用エアバッグ装置に関する。
【０００２】
【従来の技術】
自動車の車体における乗員頭部よりも高い位置には、サイドルーフレールが配され、このサイドルーフレールに沿って、側面衝突時における乗員保護用のエアバッグ装置を設けたものがある（類似技術として、特開２０００−１２７８８５号公報参照）。
【０００３】
この種のエアバッグ装置は、上端部が前記サイドルーフレールに固定された状態で、全体が上下方向で折り畳まれて収納されていると共に、前席乗員と後席乗員とにそれぞれ対応する２つの膨張室があって、インフレータからの噴出ガスにより上方から下方に向けて膨張しながらカーテン状に降りてくる構造である。インフレータのガスは、一般に後席用の膨張室内に噴射され、その後、連通部を介して前席用の膨張室に導かれる（この逆のタイプもある）。
【０００４】
【発明が解決しようとする課題】
しかしながら、このような従来の技術にあっては、エアバッグが膨張する時に、乗員が自動車の室内側壁に近寄っていることなどにより、乗員と室内側壁との間隙が小さくなっている場合には、エアバッグがスムーズに展開しづらくなるおそれがある。
【０００５】
この発明は、このような従来の技術に着目してなされたものであり、乗員が自動車の室内側壁に近寄っていても、スムーズにエアバッグが展開可能なる自動車の側突用エアバッグ装置を提供するものである。
【０００６】
【課題を解決するための手段】
請求項１に記載の発明は、上端部が乗員頭部よりも高い位置にある車体上部に固定された状態で全体が上下方向で折り畳まれて収納されてなると共に、自動車の側面衝突時に、インフレータのガスを導くことにより、下側へ向けてカーテン状に展開させるエアバッグを備えた自動車の側突用エアバッグ装置であって、前記エアバッグが、前後に離間して配され且つ上側に開口を有する第１，第２膨張室と、該第１，第２膨張室に挟まれた位置に配され且つ下側に開口を有する第３膨張室と、前記第１，第２膨張室の開口及び前記インフレータを連通した第１連通部と、前記第１，第２膨張室の下側及び前記第３膨張室の開口を連通した第２連通部とより構成されてなり、前記第１，第２膨張室と第３膨張室とは、分離されてなる。
【０００７】
請求項１に記載の発明によれば、前記インフレータからガスが噴出されると、まず第１連通部を介在して第１，第２膨張室にガスが進入して、折り畳まれた状態から展開されるので、第１，第２膨張室の左右幅寸法は薄いままに第１，第２膨張室の下端側から順次解放させるため、乗員が自動車の室内側壁に近寄っていても、その間隙内にスムーズにエアバッグが展開可能である。つまり、保護すべき乗員と自動車室内側壁との間にエアバッグが入り込むことが可能である。次に、第１，第２膨張室の下側の第２連通部を介在して第３膨張室が膨張するので、乗員の二次衝突などの衝撃力を吸収できる。
【０００９】
また、第１，第２膨張室と第３膨張室とは、互いに折り方を変えることが出来るので、乗員と室内側壁との間隙などの小さな隙間に入りやすいロール状の折り方や展開の早い蛇腹状の折り方など適宜変更できる。
【００１０】
請求項２に記載の発明は、上端部が乗員頭部よりも高い位置にある車体上部に固定された状態で全体が上下方向で折り畳まれて収納されてなると共に、自動車の側面衝突時に、インフレータのガスを導くことにより、下側へ向けてカーテン状に展開させるエアバッグを備えた自動車の側突用エアバッグ装置であって、前記エアバッグが、前後に離間して配され且つ上側に開口を有する第１，第２膨張室と、該第１，第２膨張室に挟まれた位置に配され且つ下側に開口を有する第３膨張室と、前記第１，第２膨張室の開口及び前記インフレータを連通した第１連通部と、前記第１，第２膨張室の下側及び前記第３膨張室の開口を連通した第２連通部とより構成されてなり、前記第２連通部は、前記インフレータからガスが導入されていない状態で、ねじられてなることで、ガスを第３膨張室へ導くのを一時停止可能とさせてなる。
【００１１】
請求項２に記載の発明によれば、前記インフレータからガスが噴出されると、まず第１連通部を介在して第１，第２膨張室にガスが進入して、折り畳まれた状態から展開されるので、第１，第２膨張室の左右幅寸法は薄いままに第１，第２膨張室の下端側から順次解放させるため、乗員が自動車の室内側壁に近寄っていても、その間隙内にスムーズにエアバッグが展開可能である。つまり、保護すべき乗員と自動車室内側壁との間にエアバッグが入り込むことが可能である。次に、第１，第２膨張室の下側の第２連通部を介在して第３膨張室が膨張するので、乗員の二次衝突などの衝撃力を吸収できる。また、第２連通部がねじられているので、第１，第２膨張室に注入されたガスは第３膨張室に行かないことになり、第１，第２膨張室のみを早急に膨張させることが出来る。
【００１２】
請求項３に記載の発明は、前記第１，第２膨張室を、連続したくの字状態の折り畳み状態にすると共に前記第３膨張室を、室内側へロール状に巻いた折り畳み状態にする。
【００１３】
請求項３に記載の発明によれば、第１，第２膨張室を、連続したくの字状態の折り畳み状態にすると共に前記第３膨張室を、室内側へロール状に巻いた折り畳み状態にしてあるため、最初に膨張する第１，第２膨張室がくの字を解くようにして解放し、第１，第２膨張室が解放されるに伴い、第３膨張室の先端としての下側から確実に膨張させることができ、エアバッグの展開速度が更に向上する。
【００１４】
請求項４に記載の発明は、第３膨張室を前後に複数設けてなる。
【００１５】
請求項４に記載の発明によれば、第３膨張室を前後に複数設けてなるので、前席乗員も後席乗員も共に側突時における車体への干渉を確実に防止できる。
【００１６】
【発明の実施の形態】
以下、この発明の好適な一実施形態を図１乃至図１１に基づいて説明する。
【００１７】
図１は、エアバッグ１が展開した状態で斜め上から見た図を示している。エアバッグ１は、上端部が図示しない乗員がシートに着座した状態の頭部よりも高い位置にある車体上部であるサイドルーフレールに固定された状態で全体が上下方向で折り畳まれて収納されてなると共に、自動車の側面衝突時に、インフレータ２のガスＧを導くことにより、下側ＬＷＲへ向けてカーテン状に展開させるもので、前記エアバッグ１が、前後に離間して配され且つ上側ＵＰに開口３を有する第１，第２膨張室４，５と、該第１，第２膨張室４，５に挟まれた位置に配され且つ下側ＬＷＲに開口６を有する第３膨張室７と、前記第１，第２膨張室４、５の開口３及び前記インフレータ２を連通したガス導入通路８及び第１連通部９と、前記第１，第２膨張室４，５の下側ＬＷＲ及び前記第３膨張室７の開口６を連通した第２連通部１０とより構成されてなる。
【００１８】
エアバッグ１は、２枚の基布を縫合した袋状で、上端部の数カ所がブラケット１１を介して図示しないサイドルーフレールに固定されている。前記第１，第２膨張室４，５は、前後方向に若干の斜め状に配されている。前記第３膨張室７は、図１に示すように、前後方向に４つの空間に分割している。前席第１，第２膨張室４，５と第３膨張室７との間には、空間部１２，１３が形成されている。
【００１９】
前記ガス導入通路８からインフレータ２のガスＧを第１膨張室４内に導くと共に第１連通部９を介して第２膨張室５内に噴出できるようになっている。
【００２０】
次に、このエアバッグ１の折り畳み方を、図３乃至図８に基づいて説明する。まず、ガスＧが封入されない状態のエアバッグ１は、図３に示す状態にあり、その断面は図４（ａ），（ｂ）に示すように扁平である。第２連通部１０の両端部の第１，第２膨張室４，５と第３膨張室７との間の空間部１２，１３の下側ＬＷＲの位置で捩り曲げる（捩り曲げ部１４）。また、第１，第２膨張室４，５を下側部分を上側に折って重ね合わせる〔図６（ｂ）から図８（ｂ）〕と共に第３膨張室７の下側ＬＷＲを持ち上げて乗員側へロール状に巻いた状態にする〔図６（ａ）から図８（ａ）〕。斜めから見ると、図５から図７に変化する。
【００２１】
次に、このエアバッグ１の展開状態を図９乃至図１１に基づいて説明する。自動車が側面衝突を起こすと、図示せぬセンサーからインフレータ２に信号が送られ、インフレータ２が作動してガスＧをガス導入通路８に噴射する。ガス導入通路８内に噴射されたガスＧは、第１膨張室４を膨張させると共に、第１連通部９を介して第２膨張室５に導かれる。
【００２２】
第１，第２膨張室４，５は、開口３が共に上側ＵＰにあり、下側ＬＷＲにガスＧが流れ込んでも、その先にある捩り曲げ部１４によってそれ以上ガスＧが導かれないので、第１，第２膨張室４，５がまず膨張する。第１，第２膨張室４，５が膨張した後、前記捩り曲げ部１４の捩りが元に戻ることで第２連通部１０が第１，第２膨張室４，５と連通し、ガスＧは、第１，第２膨張室４，５から第３膨張室７に流れ始める。この際、第３膨張室７の開口６がエアバッグ１の下側ＬＷＲにあるので、下側ＬＷＲから膨張始める。この際、第３膨張室７は車体に対する付け根である上部よりも、先端である下側ＬＷＲの方が先に膨張する。特に、この実施形態では、ロール状に巻いた第３膨張室７が最も乗員側に位置させたため、最初に膨張するエアバッグ１の下側ＬＷＲの邪魔になるものはなく、エアバッグ１は、下側ＬＷＲから膨張し始めることになる。。
【００２３】
また、エアバッグ１は、先端である下側ＬＷＲから折り畳み状態を解放しながら、図示しないルーフライニングの端部を押し退けて下側ＬＷＲへ膨張し、最終的に付け根である上側ＵＰまで膨張が達して、エアバッグ１全体が乗員と車体側壁との間で、カーテン状に展開した状態となり、乗員を保護する。
【００２４】
以上説明したように、この実施形態によれば、インフレータ２からガスＧが噴出されると、まず第１連通部９を介在して第１，第２膨張室４，５にガスＧが進入して、折り畳まれた状態から展開されるので、第１，第２膨張室４，５の左右幅寸法は薄いままに第１，第２膨張室４，５の下端側から順次解放させるため、乗員が自動車の室内側壁２０に近寄っていても、その間隙内にスムーズにエアバッグ１が展開可能である。つまり、保護すべき乗員と自動車室内側壁２０との間にエアバッグ１が入り込むことが可能である。次に、第１，第２膨張室４，５の下側ＬＷＲの第２連通部１０を介在して第３膨張室７が膨張するので、乗員の二次衝突などの衝撃力を吸収できる。
【００２５】
また、第１，第２膨張室４，５と第３膨張室７とは、互いに折り方を変えることが出来るので、乗員と室内側壁２０との間隙などの小さな隙間に入りやすいロール状の折り方や展開の早い蛇腹状の折り方など適宜変更できる。
【００２６】
また、第２連通部１０が途中の捩り曲げ部１４でねじられているので、第１，第２膨張室４，５に注入されたガスＧは第３膨張室７に行かないことになり、第１，第２膨張室４，５のみを早急に膨張させることが出来る。
【００２７】
また、前記第１，第２膨張室４，５を、連続したくの字状態の折り畳み状態にすると共に前記第３膨張室７を、室内側へロール状に巻いた折り畳み状態にしてあるため、最初に膨張する第１，第２膨張室４，５がくの字を解くようにして解放し、第１，第２膨張室４，５が解放されるに伴い、第３膨張室７の先端としての下側ＬＷＲから確実に膨張させることができ、エアバッグ１の展開速度が更に向上する。
【００２８】
第３膨張室７を前後に複数設けてなるので、前席乗員も後席乗員も共に側突時における車体への干渉を確実に防止できる。
【００２９】
尚、以上の実施形態においては、インフレータ２のガスＧを第１膨張室４側に噴出させ、そのガスＧを第１連通部９を介して第２膨張室５に導く例を示したが、逆でも良い。
【００３０】
【発明の効果】
この発明によれば、前記インフレータからガスが噴出されると、まず第１連通部を介在して第１，第２膨張室にガスが進入して、折り畳まれた状態から展開されるので、第１，第２膨張室の左右幅寸法は薄いままに第１，第２膨張室の下端側から順次解放させるため、乗員が自動車の室内側壁に近寄っていても、その間隙内にスムーズにエアバッグが展開可能である。つまり、保護すべき乗員と自動車室内側壁との間にエアバッグが入り込むことが可能である。次に、第１，第２膨張室の下側の第２連通部を介在して第３膨張室が膨張するので、乗員の二次衝突などの衝撃力を吸収できる。
【図面の簡単な説明】
【図１】この発明の一実施形態に係るエアバッグが下向きに展開した状態を示す車室内斜視図。
【図２】図１の断面図。
【図３】図１のエアバッグにガスが封入されていない状態での斜視図。
【図４】（ａ）図３中矢示ＳＡ−ＳＡ線に沿う断面図、（ｂ）図３中矢示ＳＢ−ＳＢ線に沿う断面図。
【図５】図３のエアバッグを折り畳み始めた状態を示す斜視図。
【図６】（ａ）図５中矢示ＳＣ−ＳＣ線に沿う断面図、（ｂ）図５中矢示ＳＤ−ＳＤ線に沿う断面図。
【図７】図５のエアバッグを折り畳み終わった状態を示す斜視図。
【図８】（ａ）図７中矢示ＳＥ−ＳＥ線に沿う断面図、（ｂ）図７中矢示ＳＦ−ＳＦ線に沿う断面図。
【図９】（ａ）図８（ａ）に示す巻き込まれた状態の第３膨張室とドアトリムとの関係を示す断面図、（ｂ）ガスが捩り曲げ部を元に戻す前の断面図、（ｃ）第２連通部内にガスが導入された状態の第３膨張室の断面図、（ｄ）第３膨張室が膨張した状態を示す断面図。
【図１０】（ａ）図８（ｂ）に示す折り畳まれた状態の第１，２膨張室とドアトリムとの関係を示す断面図、（ｂ）ガスが導かれて膨張始めた第１，第２膨張室の断面図、（ｃ）ガスが導入されると共に第３膨張室にガスを供給始めた断面図、（ｄ）第１，第２膨張室が膨張した状態を示す断面図。
【図１１】（ａ）図１のエアバッグの折り畳まれた状態を示す正面図、（ｂ）第１，第２膨張室が膨張始めた状態を示すエアバッグの正面図、（ｃ）第１，第２膨張室が膨張した状態を示すエアバッグの正面図、（ｄ）第３膨張室が膨張した状態を示すエアバッグの正面図。
【符号の説明】
１エアバッグ
２インフレータ
３開口
４第１膨張室
５第２膨張室
６開口
７第３膨張室
８ガス導入通路
９第１連通部
１０第２連通部
１４捩り曲げ部
Ｇガス
ＵＰ上側
ＬＷＲ下側
ＦＲ前側
ＲＲ後側[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag device for a side collision of an automobile.
[0002]
[Prior art]
A side roof rail is arranged at a position higher than the head of the occupant in the body of an automobile, and an airbag device for protecting an occupant at the time of a side collision is provided along the side roof rail. No. 2000-1227885).
[0003]
This type of airbag device is folded in the vertical direction with the upper end fixed to the side roof rail, and is stored in two inflatables corresponding respectively to the front seat occupant and the rear seat occupant. There is a chamber, and it is a structure that descends in a curtain shape while expanding from the upper side to the lower side by the gas ejected from the inflator. The inflator gas is generally injected into the expansion chamber for the rear seat, and then guided to the expansion chamber for the front seat through the communication portion (the reverse type is also possible).
[0004]
[Problems to be solved by the invention]
However, in such a conventional technique, when the airbag is inflated, when the gap between the occupant and the indoor side wall is small due to the occupant approaching the indoor side wall of the automobile, etc., There is a risk that the airbag will not be deployed smoothly.
[0005]
The present invention has been made by paying attention to such a conventional technique, and provides an airbag device for a side impact of an automobile that can be smoothly deployed even when an occupant approaches the interior side wall of the automobile. To do.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, the whole is folded and stored in the vertical direction with the upper end fixed to the upper part of the vehicle body at a position higher than the head of the occupant. An airbag device for a side impact of an automobile provided with an airbag that is deployed in a curtain shape downward by guiding the gas of the vehicle, wherein the airbag is spaced apart in the front-rear direction and opened upward First and second expansion chambers, a third expansion chamber disposed at a position sandwiched between the first and second expansion chambers and having an opening on the lower side, and openings of the first and second expansion chambers and a first communicating portion communicating with the inflator, wherein the first, Ri Na is more configuration and second communicating portion communicating the opening of the lower and the third expansion chamber of the second expansion chamber, the first, the second expansion chamber and the third expansion chamber, ing separated.
[0007]
According to the first aspect of the present invention, when the gas is ejected from the inflator, the gas first enters the first and second expansion chambers via the first communicating portion and is expanded from the folded state. Therefore, in order to sequentially release the first and second expansion chambers from the lower end side of the first and second expansion chambers while keeping the left and right width dimensions of the first and second expansion chambers thin, even if the occupant approaches the indoor side wall of the automobile, Air bag can be deployed smoothly. That is, the airbag can enter between the passenger to be protected and the side wall of the automobile interior. Next, since the third expansion chamber expands via the second communication portion on the lower side of the first and second expansion chambers, an impact force such as a secondary collision of the occupant can be absorbed.
[0009]
In addition , since the first and second expansion chambers and the third expansion chamber can be folded differently, a roll-shaped folding method that is easy to enter a small gap such as a gap between the occupant and the interior side wall and quick deployment are provided. The bellows-like folding method can be appropriately changed.
[0010]
According to a second aspect of the present invention , the whole is folded and stored in the vertical direction with the upper end fixed to the upper part of the vehicle body at a position higher than the head of the occupant. An airbag device for a side impact of an automobile provided with an airbag that is deployed in a curtain shape downward by guiding the gas of the vehicle, wherein the airbag is spaced apart in the front-rear direction and opened upward First and second expansion chambers, a third expansion chamber disposed at a position sandwiched between the first and second expansion chambers and having an opening on the lower side, and openings of the first and second expansion chambers And a first communication portion that communicates with the inflator, and a second communication portion that communicates with the lower side of the first and second expansion chambers and the opening of the third expansion chamber, and the second communication portion. Is a state in which no gas is introduced from the inflator , By becoming twisted, made by possible pause for directing gas into the third expansion chamber.
[0011]
According to the second aspect of the present invention, when gas is ejected from the inflator, the gas first enters the first and second expansion chambers via the first communicating portion and is expanded from the folded state. Therefore, in order to sequentially release the first and second expansion chambers from the lower end side of the first and second expansion chambers while keeping the left and right width dimensions of the first and second expansion chambers thin, even if the occupant approaches the indoor side wall of the automobile, Air bag can be deployed smoothly. That is, the airbag can enter between the passenger to be protected and the side wall of the automobile interior. Next, since the third expansion chamber expands via the second communication portion on the lower side of the first and second expansion chambers, an impact force such as a secondary collision of the occupant can be absorbed. Further, since the second communication portion is twisted, the gas injected into the first and second expansion chambers does not go to the third expansion chamber, and only the first and second expansion chambers are rapidly expanded. I can do it.
[0012]
According to a third aspect of the present invention, the first and second expansion chambers are in a folded state in a continuous U-shape and the third expansion chamber is in a folded state in which the third expansion chamber is wound in a roll shape toward the indoor side. .
[0013]
According to the third aspect of the present invention, the first and second expansion chambers are in a folded state in a continuous U-shape, and the third expansion chamber is in a folded state in which the third expansion chamber is wound in a roll shape toward the indoor side. Therefore, the first and second expansion chambers that expand first are released so as to unravel, and as the first and second expansion chambers are released, the lower side as the tip of the third expansion chamber The airbag can be reliably inflated, and the deployment speed of the airbag is further improved.
[0014]
The invention according to claim 4 is provided with a plurality of third expansion chambers at the front and rear.
[0015]
According to the invention described in claim 4 , since a plurality of the third expansion chambers are provided in the front and rear, both the front seat occupant and the rear seat occupant can reliably prevent interference with the vehicle body at the time of a side collision.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described below with reference to FIGS.
[0017]
FIG. 1 shows a view seen obliquely from above with the airbag 1 deployed. The airbag 1 is folded and housed in the vertical direction with the upper end fixed to a side roof rail that is an upper part of the vehicle body at a position higher than the head in a state where a passenger (not shown) is seated on the seat. At the same time, the gas G of the inflator 2 is guided in a curtain shape toward the lower LWR at the time of a side collision of the automobile, and the airbag 1 is spaced apart from the front and rear and opened to the upper UP. 3, first expansion chambers 4 and 5, and third expansion chamber 7 disposed between the first and second expansion chambers 4 and 5 and having an opening 6 in the lower LWR, A gas introduction passage 8 and a first communication portion 9 communicating with the openings 3 of the first and second expansion chambers 4 and 5 and the inflator 2; a lower LWR of the first and second expansion chambers 4 and 5; 2nd communication which connected the opening 6 of the 3rd expansion chamber 7 It is more structure 10 composed.
[0018]
The airbag 1 has a bag shape in which two base fabrics are stitched, and several places at the upper end are fixed to a side roof rail (not shown) via a bracket 11. The first and second expansion chambers 4 and 5 are arranged in a slightly oblique shape in the front-rear direction. As shown in FIG. 1, the third expansion chamber 7 is divided into four spaces in the front-rear direction. Space portions 12 and 13 are formed between the front seat first and second expansion chambers 4 and 5 and the third expansion chamber 7.
[0019]
The gas G of the inflator 2 is guided from the gas introduction passage 8 into the first expansion chamber 4 and can be ejected into the second expansion chamber 5 through the first communication portion 9.
[0020]
Next, how to fold the airbag 1 will be described with reference to FIGS. First, the airbag 1 in a state where the gas G is not sealed is in the state shown in FIG. 3, and its cross section is flat as shown in FIGS. 4 (a) and 4 (b). Torsional bending is performed at the lower LWR positions of the space portions 12 and 13 between the first and second expansion chambers 4 and 5 and the third expansion chamber 7 at both ends of the second communication portion 10 (torsion bending portion 14). Further, the first and second expansion chambers 4 and 5 are overlapped with the lower portion folded upward (FIGS. 6B to 8B) and the lower LWR of the third expansion chamber 7 is lifted to occupant. It is made into the state wound in the roll shape to the side [FIG. 6 (a) to FIG. 8 (a)]. When viewed obliquely, the state changes from FIG. 5 to FIG.
[0021]
Next, the deployment state of this airbag 1 is demonstrated based on FIG. 9 thru | or FIG. When the automobile has a side collision, a signal is sent from a sensor (not shown) to the inflator 2 and the inflator 2 is activated to inject the gas G into the gas introduction passage 8. The gas G injected into the gas introduction passage 8 expands the first expansion chamber 4 and is guided to the second expansion chamber 5 through the first communication portion 9.
[0022]
In the first and second expansion chambers 4 and 5, both the openings 3 are on the upper side UP, and even if the gas G flows into the lower LWR, the gas G cannot be guided any more by the torsional bending portion 14 ahead of the gas G. The first and second expansion chambers 4 and 5 are first expanded. After the first and second expansion chambers 4 and 5 expand, the twist of the torsional bending portion 14 returns to the original state, so that the second communication portion 10 communicates with the first and second expansion chambers 4 and 5 and the gas G Begins to flow from the first and second expansion chambers 4 and 5 to the third expansion chamber 7. At this time, since the opening 6 of the third expansion chamber 7 is located on the lower LWR of the airbag 1, the inflation starts from the lower LWR. At this time, in the third expansion chamber 7, the lower LWR that is the tip expands earlier than the upper part that is the root of the vehicle body. In particular, in this embodiment, since the third expansion chamber 7 wound in a roll shape is positioned on the most occupant side, there is nothing that obstructs the lower LWR of the airbag 1 that is inflated first. It will begin to expand from the lower LWR. .
[0023]
Further, the airbag 1 is inflated to the lower LWR by pushing away the end of the roof lining (not shown) while releasing the folded state from the lower LWR that is the tip, and finally reaches the upper UP that is the root. Thus, the airbag 1 as a whole is deployed in a curtain shape between the occupant and the side wall of the vehicle body to protect the occupant.
[0024]
As described above, according to this embodiment, when the gas G is ejected from the inflator 2, the gas G first enters the first and second expansion chambers 4, 5 via the first communication portion 9. Since the left and right widths of the first and second expansion chambers 4 and 5 are thin, the passengers are sequentially released from the lower ends of the first and second expansion chambers 4 and 5, Even if the vehicle approaches the indoor side wall 20 of the automobile, the airbag 1 can be smoothly deployed in the gap. That is, the airbag 1 can enter between the passenger to be protected and the vehicle interior side wall 20. Next, since the third expansion chamber 7 expands via the second communicating portion 10 of the lower LWR of the first and second expansion chambers 4 and 5, an impact force such as a secondary collision of the occupant can be absorbed.
[0025]
In addition, the first and second expansion chambers 4 and 5 and the third expansion chamber 7 can be folded differently, so that a roll-shaped fold that easily enters a small gap such as a gap between the occupant and the interior side wall 20 can be used. The folding method can be changed as appropriate.
[0026]
Further, since the second communication portion 10 is twisted by the twisted bending portion 14 in the middle, the gas G injected into the first and second expansion chambers 4 and 5 does not go to the third expansion chamber 7. Only the first and second expansion chambers 4 and 5 can be rapidly expanded.
[0027]
In addition, since the first and second expansion chambers 4 and 5 are in a folded state in a continuous U-shape, the third expansion chamber 7 is in a folded state wound in a roll shape on the indoor side. As the first and second expansion chambers 4 and 5 are released, the first and second expansion chambers 4 and 5 that are initially expanded are released so as to be unraveled, and as the first and second expansion chambers 4 and 5 are released, Thus, the airbag 1 can be inflated reliably from the lower LWR, and the deployment speed of the airbag 1 is further improved.
[0028]
Since a plurality of the third expansion chambers 7 are provided on the front and rear sides, both the front seat occupant and the rear seat occupant can reliably prevent interference with the vehicle body at the time of a side collision.
[0029]
In the above embodiment, the gas G of the inflator 2 is ejected to the first expansion chamber 4 side, and the gas G is guided to the second expansion chamber 5 through the first communication portion 9. The reverse is also acceptable.
[0030]
【The invention's effect】
According to the present invention, when the gas is ejected from the inflator, the gas first enters the first and second expansion chambers via the first communicating portion and is expanded from the folded state. Since the left and right width dimensions of the first and second expansion chambers are sequentially released from the lower end side of the first and second expansion chambers, the airbag can smoothly enter the gap even when the occupant approaches the vehicle interior side wall. Can be deployed. That is, the airbag can enter between the passenger to be protected and the side wall of the automobile interior. Next, since the third expansion chamber expands via the second communication portion on the lower side of the first and second expansion chambers, an impact force such as a secondary collision of the occupant can be absorbed.
[Brief description of the drawings]
1 is a vehicle interior perspective view showing a state in which an airbag according to an embodiment of the present invention is deployed downward;
FIG. 2 is a cross-sectional view of FIG.
3 is a perspective view in a state where no gas is sealed in the airbag of FIG. 1. FIG.
4A is a cross-sectional view taken along line SA-SA in FIG. 3, and FIG. 4B is a cross-sectional view taken along line SB-SB in FIG.
5 is a perspective view showing a state in which the airbag of FIG. 3 has started to be folded.
6A is a cross-sectional view taken along the line SC-SC in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line SD-SD in FIG.
7 is a perspective view showing a state in which the airbag of FIG. 5 has been folded. FIG.
8A is a cross-sectional view taken along line SE-SE in FIG. 7, and FIG. 8B is a cross-sectional view taken along line SF-SF in FIG.
9A is a cross-sectional view showing the relationship between the third expansion chamber and the door trim in the rolled state shown in FIG. 8A, and FIG. 9B is a cross-sectional view before the gas returns the twisted bending portion. (C) Sectional drawing of the 3rd expansion chamber in the state where the gas was introduced in the 2nd communicating part, (d) Sectional drawing which shows the state which the 3rd expansion chamber expanded.
10A is a cross-sectional view showing the relationship between the folded first and second expansion chambers and the door trim shown in FIG. 8B, and FIG. 2 is a cross-sectional view of the expansion chamber, (c) a cross-sectional view in which gas is introduced and gas is started to be supplied to the third expansion chamber, and (d) a cross-sectional view in which the first and second expansion chambers are expanded.
11A is a front view showing a folded state of the airbag of FIG. 1, FIG. 11B is a front view showing the airbag in which the first and second expansion chambers have started to be inflated, and FIG. The front view of the airbag which shows the state which the 2nd expansion chamber expanded, (d) The front view of the airbag which shows the state which the 3rd expansion chamber expanded.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Airbag 2 Inflator 3 Opening 4 1st expansion chamber 5 2nd expansion chamber 6 Opening 7 3rd expansion chamber 8 Gas introduction passage 9 1st communication part 10 2nd communication part 14 Torsion bending part G Gas UP Upper LWR Lower FR Front side RR Rear side

Claims

The upper part is folded and stored in the vertical direction with the upper end fixed to the upper part of the vehicle body, which is higher than the head of the occupant. An airbag device for a side impact of an automobile provided with an airbag that is deployed in a curtain shape toward the
The airbag is disposed at the front and rear sides and has an opening on the upper side, the first and second expansion chambers, and the airbag is disposed at a position sandwiched between the first and second expansion chambers and has an opening on the lower side. The third expansion chamber, the first communication portion communicating with the opening of the first and second expansion chambers and the inflator, the lower side of the first and second expansion chambers, and the opening of the third expansion chamber were communicated. Ri Na is more configuration and the second communication unit,
It said first and second expansion chamber and the third expansion chamber, the side airbag system of a motor vehicle, characterized in Rukoto such separated.

The upper part is folded and stored in the vertical direction with the upper end fixed to the upper part of the vehicle body, which is higher than the head of the occupant. An airbag device for a side impact of an automobile provided with an airbag that is deployed in a curtain shape toward the
The airbag is disposed at the front and rear sides and has an opening on the upper side, the first and second expansion chambers, and the airbag is disposed at a position sandwiched between the first and second expansion chambers and has an opening on the lower side. The third expansion chamber, the first communication portion communicating with the opening of the first and second expansion chambers and the inflator, the lower side of the first and second expansion chambers, and the opening of the third expansion chamber were communicated. It consists of the second communication part,
The second communication portion is twisted in a state where no gas is introduced from the inflator, so that the gas can be temporarily stopped from being guided to the third expansion chamber. Side impact airbag device. An air bag device for a side impact of an automobile.

An airbag device for a side collision of an automobile according to claim 1 or 2,
Said first, side of the vehicle the second expansion chamber and the third expansion chamber as well as the folded state of the shaped state of want continuous, wherein to Rukoto the folded state wound into a roll toward the cabin A crash airbag device.

The airbag device for a side collision of an automobile according to any one of claims 1 to 3,
Side airbag apparatus for an automobile according to claim plurality such by Rukoto the third expansion chamber back and forth.