JP2018134976A

JP2018134976A - Airbag device

Info

Publication number: JP2018134976A
Application number: JP2017030642A
Authority: JP
Inventors: 美枝吉村; Yoshie Yoshimura; 多衛柴原; Tae Shibahara; 岳宏成川; Takehiro Narukawa
Original assignee: Mazda Motor Corp
Current assignee: Mazda Motor Corp
Priority date: 2017-02-22
Filing date: 2017-02-22
Publication date: 2018-08-30
Anticipated expiration: 2037-02-22
Also published as: JP6579128B2

Abstract

PROBLEM TO BE SOLVED: To maintain occupant protection performance and reduce an impact applied to an occupant in an airbag having a cavity at a center in a side view.SOLUTION: A vehicle has seats 110, 120, 130 which are arranged in at least two rows in a longitudinal direction so that relative positions of a front seat 100F and a rear seat 100R can be changed. The vehicle includes an airbag 10 which is provided on a back surface of a seat back 100b of at least the front seat 100F, has a cavity at an inner side in a vehicle side view, and expands rearward in an annular shape. The airbag 10 has an area R which is recessed so as to be away from a rear seat occupant at a center part, and recess covering cloth 17 which has a surface so as to cover the recessed area R from a rear seat occupant side is provided.SELECTED DRAWING: Figure 1

Description

この発明は、前席シートと後席シートとの相対位置が変更可能に前後方向に少なくとも２列のシートを有する車両において、少なくとも前席のシートバック背面に設けられるエアバッグ装置に関する。 The present invention relates to an airbag device provided at the back of a seat back of a front seat in a vehicle having at least two rows of seats in the front-rear direction so that the relative positions of a front seat and a rear seat can be changed.

車両における乗員保護ニーズが高まっており、乗員保護のために後席シート（後席）にもエアバッグを設ける動きがある。 There is a growing need for occupant protection in vehicles, and there is a movement to install an airbag on the rear seat (rear seat) to protect the occupant.

後席用のエアバッグは、前席用のエアバッグと異なり、前方には通常、前後方向の位置を変更可能な前席シートがあり、該前席シートのシートバックにエアバッグを設けると、前席シートを十分に後退させた場合には、エアバッグの展開位置が後席シートに着席する乗員（後席乗員）の近くになりすぎるなど、前席シートの位置によって保護性能が変化することになる。つまり、後席用のエアバッグは、前席シートの位置によらず後席乗員の一定の保護性能を確保する必要がある。 Unlike the airbag for the front seat, the airbag for the rear seat usually has a front seat that can change the position in the front-rear direction, and when the airbag is provided on the seat back of the front seat, If the front seat is fully retracted, the protection performance will change depending on the position of the front seat, such as the airbag deployment position being too close to the passenger seated in the rear seat (rear seat passenger). become. In other words, the airbag for the rear seat needs to ensure a certain protection performance for the rear seat occupant regardless of the position of the front seat.

この課題を解決するためのエアバッグとして、特許文献１に例示されるような、側面視で中央に空洞部を有する環状のエアバッグが検討されている。 As an airbag for solving this problem, an annular airbag having a hollow portion at the center in a side view as exemplified in Patent Document 1 has been studied.

特許文献１のような側面視環状のエアバッグは、内部のガス圧（展開圧）を利用して乗員を受け止める際に、後席乗員が高圧のガスによって膨張するエアバッグに当接することにより受ける衝撃を、空洞部が潰れることで緩和することができ、後席乗員の保護性能を高めることができるとされている。 A side-view annular airbag such as that disclosed in Patent Document 1 is received by a rear seat occupant coming into contact with an airbag inflated by high-pressure gas when the occupant is received using internal gas pressure (deployment pressure). It is said that the impact can be mitigated by crushing the cavity, and the protection performance of the rear seat occupant can be enhanced.

しかしながら、上記先行文献に記載のものは、前席がかなり後方に位置した場合、内部の空洞が完全に潰れきってしまうと、空洞部を有しない従来のエアバッグと同様に展開圧による乗員に加わる衝撃（乗員への衝撃吸収性）が問題となるおそれがある。 However, in the case of the above-mentioned prior art document, when the front seat is located considerably rearward, when the internal cavity is completely crushed, the passenger is urged by the deployment pressure in the same manner as a conventional airbag having no cavity. The applied impact (shock absorption to the passenger) may become a problem.

特開平６−３４４８４４号公報JP-A-6-344844

本発明はそのような課題に鑑みてなされたもので、側面視で中央に空洞を有するエアバッグにおいて、乗員保護性能を維持しつつ乗員へ加わる衝撃を低減できるエアバッグ装置の提供を目的とする。 The present invention has been made in view of such a problem, and an object of the present invention is to provide an airbag device that can reduce impact applied to an occupant while maintaining occupant protection performance in an airbag having a cavity in the center in a side view. .

この発明は、前席と後席との相対位置が変更可能に前後方向に少なくとも２列のシートを有する車両において、少なくとも前記前席のシートバック背面に設けられるエアバッグ装置であって、車両側面視で内側に空洞部を有する環状に後方へ展開するエアバッグを備え、前記エアバッグはその車幅方向中央部に、後席乗員から遠ざかるように窪んだ領域を有するとともに、その窪み領域を後席乗員側から覆うように面を有する窪み被覆部材が設けられたものである。 The present invention relates to an airbag device provided at least on the back of a seat back of the front seat in a vehicle having at least two rows of seats in the front-rear direction so that the relative positions of the front seat and the rear seat can be changed. The airbag includes an air bag that extends rearward in an annular shape having a hollow portion on the inside, and the air bag has a recessed area at the center in the vehicle width direction so as to move away from the rear seat occupant, and the recessed area is A hollow covering member having a surface is provided so as to cover from the seat occupant side.

上記構成によれば、後席乗員が前席に近い位置で後席に着席している状態でエアバッグが展開しても、該エアバッグの内側の空洞部が潰れ及び窪みにて後席乗員への衝撃を低減できる。また、後席乗員の姿勢が低い場合、窪み領域の内部に後席乗員の体の一部が入り込む恐れがあるが、本発明によればそのような状況を回避できる。 According to the above configuration, even when the airbag is deployed in a state where the rear seat occupant is seated in the rear seat at a position close to the front seat, the hollow portion inside the airbag is crushed and depressed so that the rear seat occupant The impact on the can be reduced. Further, when the posture of the rear seat occupant is low, there is a possibility that a part of the body of the rear seat occupant enters the inside of the hollow region, but according to the present invention, such a situation can be avoided.

この発明の態様として、前記エアバッグは、その車幅方向に３つ以上のバッグ部が車幅方向に並設された構成とし、これら複数のバッグ部のうち車幅方向において最も外側に位置しないバッグ部が後席乗員に向かって開いた車両側面視Ｃ型であり、前記窪み領域は、車両側面視でＣ型の前記バッグ部の周方向において後席乗員側が切欠き状に設けられた切欠き部とし、前記窪み被覆部材は、該切欠き部を被覆する布部材で形成されたものである。 As an aspect of the present invention, the airbag has a configuration in which three or more bag portions are juxtaposed in the vehicle width direction in the vehicle width direction, and is not located on the outermost side in the vehicle width direction among the plurality of bag portions. The bag portion is a vehicle side view C-type opened toward the rear seat occupant, and the recessed region is a notch formed in a cutout shape on the rear seat occupant side in the circumferential direction of the C-shaped bag portion in the vehicle side view. The notch covering member is formed of a cloth member that covers the notch.

上記構成によれば、エアバッグ展開時に窪み領域としての切欠き部が確実に形成され、その切欠き部を簡単な構成である布部材にて覆うことができるため、エアバッグ展開状態において、後席乗員が切欠き部に入り込まないように安定して保護することができる。 According to the above configuration, the notched portion as the recessed region is reliably formed when the airbag is deployed, and the notched portion can be covered with the cloth member having a simple configuration. It is possible to stably protect the seat occupant from entering the notch.

またこの発明の態様として、前記布部材は、前記エアバッグの前記切欠き部の周縁全体に縫着されたものである。 As an aspect of the present invention, the cloth member is sewn to the entire periphery of the notch portion of the airbag.

上記構成によれば、布部材をエアバッグの前記切欠き部の周縁にしっかりと取り付けることができるため、切欠き部を覆う布部材が後席乗員に当接することで、その衝撃をしっかりと受け止めることができつつ、前記切欠き部をしっかりと覆うため、該前記切欠き部に後席乗員の体の一部が入り込むことを確実に防ぐことができるため、後席乗員を安定して保護することができる。 According to the above configuration, since the cloth member can be firmly attached to the peripheral edge of the notch portion of the airbag, the cloth member covering the notch portion comes into contact with the rear seat occupant, thereby firmly receiving the impact. In addition, since the notch portion is covered firmly, it is possible to reliably prevent a part of the body of the rear seat occupant from entering the notch portion, thereby stably protecting the rear seat occupant. be able to.

この発明によれば、側面視で中央に空洞を有するエアバッグにおいて、乗員保護性能を維持しつつ乗員へ加わる衝撃を低減することができる。 According to the present invention, in an airbag having a cavity in the center in a side view, it is possible to reduce the impact applied to the occupant while maintaining the occupant protection performance.

前席の背面上部に搭載された本実施形態のエアバック装置の展開状態を示す斜視図。The perspective view which shows the expansion | deployment state of the airbag apparatus of this embodiment mounted in the back upper part of a front seat. 本実施形態のエアバック装置が搭載された前席の内部構造を後方から見た要部を示す斜視図。The perspective view which shows the principal part which looked at the internal structure of the front seat by which the airbag apparatus of this embodiment was mounted from back. 図２においてエアバック装置を分解して示した分解斜視図。The disassembled perspective view which decomposed | disassembled and showed the airbag apparatus in FIG. 前席の背面上部に搭載された本実施形態のエアバック装置の展開状態を示す左側面図。The left view which shows the expansion | deployment state of the airbag apparatus of this embodiment mounted in the back upper part of a front seat. 図４のＡ−Ａ線断面図。AA line sectional view of Drawing 4. 図１において窪み被覆布が取付け前の状態を示すエアバック装置の斜視図。The perspective view of the airbag apparatus which shows the state before a hollow covering cloth is attached in FIG. 図１に示すエアバッグ装置において窪み被覆布を取外した状態の背面図。The rear view of the state which removed the hollow covering cloth in the airbag apparatus shown in FIG. 図７のＢ−Ｂ線断面図（ａ）およびＣ−Ｃ線断面図（ｂ）。The BB sectional drawing (a) and CC sectional view (b) of FIG. 本実施形態のエアバック装置の作用説明図。Action | operation explanatory drawing of the airbag apparatus of this embodiment. 図９（ａ）の場合における、エアバッグに当接した乗員に加わる荷重と変位の関係を示す本実施形態のエアバック装置の特性図。The characteristic view of the airbag apparatus of this embodiment which shows the relationship between the load applied to the passenger | crew contact | abutted to the airbag, and a displacement in the case of Fig.9 (a).

以下、図面に基づいて本発明の実施形態を詳述する。
図１は前席の背面上部に搭載された本実施形態のエアバック装置の展開状態を示す斜視図、図２は本実施形態のエアバック装置が搭載された前席のカバーおよびクッション部材を取り外した状態の内部構造を後方から見た要部を示す斜視図、図３は図２においてエアバック装置を分解して示した分解斜視図。図４は前席の背面上部に搭載された本実施形態のエアバック装置の展開状態を示す左側面図、図５は図４のＡ−Ａ線断面図、図６は図１において窪み被覆布の取付け前の状態を示すエアバック装置の斜視図、図７は図１に示すエアバッグ装置において窪み被覆布を取外した状態の背面図、図８（ａ）は図７のＢ−Ｂ線断面図、図８（ｂ）は図７のＣ−Ｃ線断面図を示す。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an unfolded state of the airbag device of the present embodiment mounted on the upper back of the front seat, and FIG. 2 is a front seat cover and cushion member mounted with the airbag device of the present embodiment. The perspective view which shows the principal part which looked at the internal structure of the state which looked from the back, FIG. 3: is the disassembled perspective view which decomposed | disassembled and showed the airbag apparatus in FIG. 4 is a left side view showing a developed state of the airbag device of the present embodiment mounted on the upper back of the front seat, FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4, and FIG. The perspective view of the airbag apparatus which shows the state before attachment of FIG. 7, FIG. 7 is a rear view of the state which removed the hollow covering cloth in the airbag apparatus shown in FIG. 1, FIG. 8 (a) is the BB sectional view of FIG. FIG. 8B is a sectional view taken along the line CC of FIG.

ただし、図８（ａ）、（ｂ）では、前席の内部構造、およびエアバッグ装置に備えたリアクションプレート、ケース、カバー等を便宜上、省略して示すとともに、図５、図８（ａ）、（ｂ）ではガス流入口を簡略化して示している。また以下の説明において、エアバッグ装置の上下方向、幅方向（右方向および左方向）は車両のそれと一致しているものとする。 However, in FIGS. 8A and 8B, the internal structure of the front seat and the reaction plate, the case, the cover, and the like provided in the airbag device are omitted for the sake of convenience, and FIGS. , (B), the gas inlet is shown in a simplified manner. In the following description, it is assumed that the vertical direction and the width direction (right direction and left direction) of the airbag device coincide with those of the vehicle.

本実施形態のエアバッグ装置１を適用した車両は、前席１００Ｆと後席１００Ｒ（図９（ａ）、（ｂ）参照）との相対位置が前後方向に変更可能に車両前後方向に２列のシート１００を有しており（同図参照）、前席１００Ｆのシートバック１００ｂの背面の上部かつ幅方向の中間位置には、車両衝突時に図１に示すように後方へ向けて展開し、後席１００Ｒに着座する乗員を保護する後席乗員用のエアバッグ装置１が搭載されている。 The vehicle to which the airbag apparatus 1 of the present embodiment is applied has two rows in the vehicle front-rear direction so that the relative positions of the front seat 100F and the rear seat 100R (see FIGS. 9A and 9B) can be changed in the front-rear direction. 1 (see the same figure), at the upper part of the back surface of the seat back 100b of the front seat 100F and in the intermediate position in the width direction, the vehicle is deployed rearward as shown in FIG. The airbag device 1 for the rear seat occupant that protects the occupant seated in the rear seat 100R is mounted.

図２、図３に示すように、前後各列のシート１００Ｆ，１００Ｒは（図２、図３では前席１００Ｆのみ図示）、何れもシートクッション１００ａと、シートバック１００ｂと、ヘッドレスト１００ｃとを備え、このうちシートバック１００ｂ内には、シートバック１００ｂ自体を支持するためのシートバックフレーム１０１およびサスペンションマット１０２（ばね部材）が設けられるとともに、シートバック１００ｂの上部には、ヘッドレスト１００ｃを支持するとともに、その上下位置を調整可能に取り付けた左右一対のヘッドレストポール１０３，１０３が取り付けられている。 As shown in FIGS. 2 and 3, the front and rear rows of seats 100F and 100R (only the front seat 100F is shown in FIGS. 2 and 3) each include a seat cushion 100a, a seat back 100b, and a headrest 100c. Of these, a seat back frame 101 and a suspension mat 102 (spring member) for supporting the seat back 100b itself are provided in the seat back 100b, and a headrest 100c is supported above the seat back 100b. A pair of left and right headrest poles 103, 103 are attached so that their vertical positions can be adjusted.

前席１００Ｆは、車幅方向に並設された運手席と助手席とから成り、共に図２（一方のみ図示）に示すように、シートクッション１００ａをシート前後方向にスライド可能に支持するスライド機構１０４を介して図外の車室フロア１１０（フロアパネル）に設置されている。 The front seat 100F includes a driver seat and a passenger seat arranged side by side in the vehicle width direction, and as shown in FIG. 2 (only one is shown), a slide that supports the seat cushion 100a so as to be slidable in the front-rear direction of the seat. It is installed on a passenger compartment floor 110 (floor panel) (not shown) via a mechanism 104.

スライド機構１０４は、前席１００Ｆの左右両サイドの位置において車室フロア１１０に固定される左右一対のガイドレール１０４ａと、これらガイドレール１０４ａに対してスライド可能に係合するスライダ１０４ｂとで構成されている。前席１００Ｆは、スライド機構１０４のスライダ１０４ｂとシートクッション１００ａ内に設けられたシートクッションフレーム１００ａ１とが接合されており、後席１００Ｒに対して相対位置を変更可能としている。 The slide mechanism 104 includes a pair of left and right guide rails 104a that are fixed to the passenger compartment floor 110 at positions on both the left and right sides of the front seat 100F, and a slider 104b that is slidably engaged with the guide rails 104a. ing. In the front seat 100F, the slider 104b of the slide mechanism 104 and the seat cushion frame 100a1 provided in the seat cushion 100a are joined, and the relative position with respect to the rear seat 100R can be changed.

一方、本実施形態では、後席１００Ｒは、車室フロア１１０にスライド機構１０４を介さずにダイレクトに設置されている（図示省略）。 On the other hand, in the present embodiment, the rear seat 100R is directly installed on the passenger compartment floor 110 without using the slide mechanism 104 (not shown).

図２、図３に示すように、エアバッグ装置１は、エアバッグ１０（図１参照）と、車両衝突時に該エアバッグ１０内部にガスを供給して該エアバッグ１０を展開させるインフレータ２と、エアバッグ１０における膨張時の飛び出し反力を支えるリアクションプレート３と、折り畳まれたエアバッグ１０を収容するケース４と、折り畳まれたエアバッグ１０を後方から覆う布製のカバー５とを主に備えている。 As shown in FIGS. 2 and 3, the airbag device 1 includes an airbag 10 (see FIG. 1), and an inflator 2 that deploys the airbag 10 by supplying gas into the airbag 10 in the event of a vehicle collision. The reaction plate 3 mainly supports a reaction plate 3 that supports the pop-out reaction force when the airbag 10 is inflated, a case 4 that houses the folded airbag 10, and a cloth cover 5 that covers the folded airbag 10 from the rear. ing.

エアバッグ１０は、ケース４およびカバー５によって囲まれた収納空間Ｓにおいて折り畳まれた状態で収容保持されており、該エアバッグ１０に形成されたガス流入口７（図５参照）の縁部がケース４の後述する底面部（図示省略）に取り付けられており、該ケース４の底面部は、リアクションプレート３の後面３ａに互いの面同士が当接するように取り付けられている。 The airbag 10 is accommodated and held in a folded state in the storage space S surrounded by the case 4 and the cover 5, and the edge of the gas inlet 7 (see FIG. 5) formed in the airbag 10 is The case 4 is attached to a bottom surface portion (not shown), which will be described later, and the bottom surface portion of the case 4 is attached so that the surfaces of the reaction plate 3 are in contact with each other.

リアクションプレート３は、鋼板にて形成されており、シートバックフレーム１０１の上部かつ後方に、シートバック１００ｂの背面と略平行に取り付けられている。ケース４は、不図示の底面部（前面部）と、リアクションプレート３の後面３ａに取り付けられたエアバッグ１０を折り畳んだ状態で取り囲む周壁部４ａと、で形成されている。 The reaction plate 3 is formed of a steel plate, and is attached to the upper portion and the rear portion of the seat back frame 101 substantially in parallel with the rear surface of the seat back 100b. The case 4 is formed of a bottom surface portion (front surface portion) (not shown) and a peripheral wall portion 4a surrounding the airbag 10 attached to the rear surface 3a of the reaction plate 3 in a folded state.

インフレータ２は、シートバック１００ｂの両サイドに対応して左右一対備え、シートバックフレーム１０１の両サイドに位置するサイドフレーム部１０１ａにその内側サイドから取り付けられている（図２参照）。これら両サイドのインフレータ２は、共にガス供給管６（ファブリックチューブ）を介してエアバッグ１０に接続されている。 The inflator 2 includes a pair of left and right sides corresponding to both sides of the seat back 100b, and is attached to the side frame portions 101a located on both sides of the seat back frame 101 from the inner side (see FIG. 2). Both inflators 2 on both sides are connected to an airbag 10 via a gas supply pipe 6 (fabric tube).

具体的には図２に示すように、ガス供給管６は、シートバック１００ｂの両サイドにおいてインフレータ２に接続された下端接続部６ａからサイドフレーム部１０１ａに沿って上方に延び、ケース４の周壁部４ａの両側面に設けた貫通孔４ｂ（図２、図３では左側のみ図示）から収納空間Ｓに導入され、収納空間Ｓにおいて、不図示の上端接続部がエアバッグ１０に形成されたガス流入口７に接続されている。 Specifically, as shown in FIG. 2, the gas supply pipe 6 extends upward along the side frame portion 101 a from the lower end connection portion 6 a connected to the inflator 2 on both sides of the seat back 100 b, and the peripheral wall of the case 4. Gas that is introduced into the storage space S through through holes 4b (only the left side is shown in FIGS. 2 and 3) provided on both side surfaces of the portion 4a, and an upper end connection portion (not shown) is formed in the airbag 10 in the storage space S It is connected to the inflow port 7.

なお、ガス供給管６は、インフレータ２作動時に供給するガスからの内圧を受けて前席乗員を押さないように、前側からサスペンションマット１０２で抑えられるようにシートバック１００ｂ内において該サスペンションマット１０２よりも後方に配設されている。 The gas supply pipe 6 is provided in the seat back 100b from the suspension mat 102 so as to be restrained by the suspension mat 102 from the front side so as not to push the front seat occupant due to the internal pressure from the gas supplied when the inflator 2 is operated. Is also arranged rearward.

図１、図４に示すように、エアバッグ１０は、折り畳まれた状態から車両側面視で内側に貫通空洞部９を有するドーナツ形状（略円環形状）に後方へ展開するように複数枚のシート１１０，１２０（図１参照），１３０を縫い合わせることによって形成されている。シート１１０，１２０，１３０の素材は、エアバッグのシートとして一般に用いられる合成樹脂等の素材が採用されているが特に限定されない。 As shown in FIGS. 1 and 4, the airbag 10 includes a plurality of airbags 10 that are deployed rearward from a folded state into a donut shape (substantially annular shape) having a through-cavity portion 9 inward in a vehicle side view. It is formed by sewing sheets 110, 120 (see FIG. 1) and 130 together. The material of the sheets 110, 120, 130 is not particularly limited, although a material such as a synthetic resin generally used as an airbag seat is employed.

貫通空洞部９は、エアバッグ１０の側面視で中央部に車幅方向に貫通する貫通孔として形成されている。すなわち、エアバッグ１０は、車幅方向に延びる軸を有する倒位の略円筒状に形成されている。 The through-cavity portion 9 is formed as a through-hole penetrating in the vehicle width direction in the center portion in a side view of the airbag 10. That is, the airbag 10 is formed in an inverted substantially cylindrical shape having an axis extending in the vehicle width direction.

エアバッグ１０は、その車幅方向中央部に位置する中央バッグ部１１と、該中央バッグ部１１の車幅方向の両サイドに位置する外側バッグ部１２，１３（右側バッグ部１２、左側バッグ部１３）との３つのバッグ部１１，１２，１３が車幅方向に並設された構成であり、エアバッグ１０の内部には、図５に示すように、エアバッグ１０の展開時にこれら３つのバッグ部１１，１２，１３の内部が車幅方向全体に亘って連通する内部空間１０Ａを有している。 The airbag 10 includes a central bag portion 11 located at a center portion in the vehicle width direction, and outer bag portions 12 and 13 (right bag portion 12, left bag portion) located on both sides of the central bag portion 11 in the vehicle width direction. 13) and the three bag portions 11, 12, and 13 are arranged in parallel in the vehicle width direction. Inside the airbag 10, as shown in FIG. The interior of the bag parts 11, 12, 13 has an internal space 10A that communicates over the entire vehicle width direction.

エアバッグ１０は、該エアバッグ１０を形成するシート１１０，１２０，１３０として、中央バッグ部１１、右側バッグ部１２、左側バッグ部１３の夫々に対応する中央シート１１０、右側シート１２０、左側シート１３０を備え、夫々の車幅方向における対向縁部を縫着部１４０にて縫着することによって、隣り合うバッグ部（１１，１２，）又は（１１，１３）の間を節状に形成した倒位の略円筒状に形成されている。 The airbag 10 includes a central seat 110, a right seat 120, and a left seat 130 corresponding to the central bag portion 11, the right bag portion 12, and the left bag portion 13, respectively, as the seats 110, 120, and 130 forming the airbag 10. Each of the opposite edge portions in the vehicle width direction is sewn with a sewn portion 140 so that the adjacent bag portions (11, 12,) or (11, 13) are formed in a node shape. It is formed in a substantially cylindrical shape.

中央バッグ部１１は、後席乗員の頭部および胸部に対応する幅を有し、右側バッグ部１２および左側バッグ部１３は、それぞれ後席乗員の右肩部、左肩部に対応する幅（少なくとも右肩部、左肩部の幅）を有して形成されている。 The central bag portion 11 has a width corresponding to the head and chest of the rear seat occupant, and the right bag portion 12 and the left bag portion 13 have widths corresponding to the right shoulder portion and the left shoulder portion of the rear seat occupant (at least The width of the right shoulder and the left shoulder).

エアバッグ１０の展開時において右側バッグ部１２と左側バッグ部１３は、図７に示すように、中央バッグ部１１に対して左右対称形状に形成されており、車幅方向に直交する断面視（例えば、図７中のＣ−Ｃ線断面視）でドーナツ形状（円環形状）に形成されている（図８（ｂ）参照。但し、図８（ｂ）では、右側バッグ部１の幅方向の直交断面のみ図示）。 When the airbag 10 is deployed, the right bag portion 12 and the left bag portion 13 are formed symmetrically with respect to the central bag portion 11 as shown in FIG. For example, it is formed in a donut shape (annular shape) as viewed along the line CC in FIG. 7 (see FIG. 8B. However, in FIG. 8B, in the width direction of the right bag portion 1). Only an orthogonal cross section is shown).

図４、図５に示すように、右側バッグ部１２、左側バッグ部１３には、共に車幅方向の外面部１２ａ，１３ａ（右外面部１２ａ、左外面部１３ａ）がエアバッグ１０側面視で円環状に形成されており、これら車幅方向外面部１２ａ，１３ａには、車幅方向外側にガスを排出するベントホール１５が設けられている。ベントホール１５は、展開状態のエアバッグ１０の外面部１２ａ，１３ａの前後方向の中間位置（図４中のセンタラインＣＬの位置参照）よりも前方、すなわち後席乗員から遠ざかる側に位置している。さらに、ベントホール１５は、側面視で展開状態のエアバッグ１０の円環状の外面部１２ａ，１３ａの下側位置、当例では貫通空洞部９の下端位置よりも下側位置に設けられている。 As shown in FIGS. 4 and 5, the right bag portion 12 and the left bag portion 13 both have outer surface portions 12 a and 13 a (the right outer surface portion 12 a and the left outer surface portion 13 a) in the vehicle width direction in a side view of the airbag 10. It is formed in an annular shape, and vent holes 15 for exhausting gas are provided on the outer surfaces 12a, 13a in the vehicle width direction on the outer side in the vehicle width direction. The vent hole 15 is located in front of the front and rear intermediate positions (see the position of the center line CL in FIG. 4) of the outer surface portions 12a and 13a of the airbag 10 in the deployed state, that is, on the side away from the rear seat occupant. Yes. Further, the vent hole 15 is provided at a lower position of the annular outer surface portions 12a and 13a of the airbag 10 in a deployed state in a side view, in this example, at a lower position than a lower end position of the through cavity portion 9. .

一方図６、図７、図８（ａ）に示すように、中央バッグ部１１は、後席乗員に向けて開口するように車幅方向に直交する断面視（図７中のＢ−Ｂ線断面視）でＣ型（Ｃ環形状）の中央バッグ本体部１６と、窪み被覆布１７とで形成されている。 On the other hand, as shown in FIGS. 6, 7, and 8 (a), the central bag portion 11 is a cross-sectional view perpendicular to the vehicle width direction (line BB in FIG. 7) so as to open toward the rear seat occupant. It is formed of a C-shaped (C ring shape) central bag body portion 16 and a hollow covering cloth 17 in a sectional view.

中央バッグ本体部１６のＣ環形状の切欠き部分、すなわち、周方向における、後席乗員の特に胸部に対向する部位（胸部対応領域Ｒ）には、該部位を切欠き状に形成した切欠き状空洞部１８を有している。切欠き状空洞部１８は、貫通空洞部９と中央バッグ部１１の後方との間を略前後方向（径方向）に連通する。 A C-ring-shaped cutout portion of the central bag body portion 16, that is, a notch formed in a notch shape in the circumferential direction (part corresponding to the chest corresponding region R) facing the chest of the rear seat occupant. A hollow 18 is formed. The notch-shaped cavity 18 communicates between the through cavity 9 and the rear of the central bag part 11 in a substantially front-rear direction (radial direction).

切欠き状空洞部１８は、中央バッグ本体部１６の外周面における胸部対応領域Ｒを、後席乗員から遠ざかるように前方に窪ませて形成されており、さらに、該その切欠き状空洞部１８を後席乗員側から覆うように胸部対応領域Ｒに上記の窪み被覆布１７が設けられている。 The notch-shaped cavity portion 18 is formed by recessing the chest corresponding region R on the outer peripheral surface of the central bag body portion 16 forward so as to be away from the rear seat occupant, and further, the notch-shaped cavity portion 18. Is provided in the chest corresponding region R so as to cover the vehicle from the rear seat passenger side.

図１、図８（ａ）に示すように、窪み被覆布１７は、中央バッグ本体部１６に、その外周面の一部を形成する矩形形状に備えており、窪み被覆布１７の素材は、合成繊維等の化学繊維に限らず、例えば、植物繊維、動物繊維などを採用してもよい。 As shown in FIG. 1 and FIG. 8A, the hollow covering cloth 17 is provided in the central bag main body 16 in a rectangular shape that forms a part of the outer peripheral surface, and the material of the hollow covering cloth 17 is Not limited to chemical fibers such as synthetic fibers, for example, plant fibers and animal fibers may be employed.

窪み被覆布１７は、同図に示すようにその外縁を、エアバッグ１０を形成する適宜のシート１１０，１２０，１３０における切欠き状空洞部１８の周縁全体に沿って縫着部１７０で縫着している。 As shown in the figure, the recess covering cloth 17 has its outer edge sewn at the sewn portion 170 along the entire periphery of the notch-shaped cavity 18 in the appropriate sheets 110, 120, 130 forming the airbag 10. doing.

具体的には、窪み被覆布１７の上辺縁と中央シート１１０の切欠き状空洞部１８の上辺対応縁とが車幅方向に沿って縫着部１７０ａにて縫着され、同様に、窪み被覆布１７の下辺縁と、中央シート１１０における切欠き状空洞部１８の下辺対応縁、窪み被覆布１７の右辺縁と、右側シート１２０における切欠き状空洞部１８の右辺対応縁、並びに、窪み被覆布１７の左辺縁と、左側シート１３０における切欠き状空洞部１８の左辺対応縁とがそれぞれ縫着部１７０ｂ，１７０ｃ，１７０ｄにて縫着されている。 Specifically, the upper edge of the depression covering cloth 17 and the upper edge corresponding edge of the notch-shaped cavity 18 of the center sheet 110 are sewn together at the sewing portion 170a along the vehicle width direction. The lower edge of the cloth 17, the lower edge corresponding to the notched cavity 18 in the central sheet 110, the right edge of the recess covering cloth 17, the right edge corresponding to the notched cavity 18 in the right sheet 120, and the depression covering The left side edge of the cloth 17 and the left side corresponding edge of the notch-shaped cavity 18 in the left sheet 130 are sewn by sewing parts 170b, 170c, and 170d, respectively.

図５、図８（ａ）に示すように、中央バッグ部１１の前部かつ上部の位置には、車両前後方向に向けて開口する上記のガス流入口７が設けられている。当例では、ガス流入口７は、展開状態の中央バッグ部１１における貫通空洞部９の上端と略同じ高さ或いは若干高い位置に設けられている（図５、図８（ａ）参照）。 As shown in FIGS. 5 and 8A, the gas inlet 7 that opens toward the vehicle front-rear direction is provided at the front and upper positions of the central bag portion 11. In this example, the gas inlet 7 is provided at a position substantially the same as or slightly higher than the upper end of the through cavity 9 in the central bag portion 11 in the deployed state (see FIGS. 5 and 8A).

同図に示すように、エアバッグ１０の内部空間１０Ａにおける、互いに隣り合うバッグ部１１，１２，１３の間、すなわち中央バッグ部１１と右側バッグ部１２との間および中央バッグ部１１と左側バッグ部１３との間には、隣り合うバッグ部１１，１２，１３ごとに内部空間１０Ａを仕切る仕切り壁１４（右側仕切り壁１４Ｒ、左側仕切り壁１４Ｌ）が配設されている。 As shown in the figure, in the internal space 10A of the airbag 10, between adjacent bag portions 11, 12, and 13, that is, between the central bag portion 11 and the right bag portion 12, and between the central bag portion 11 and the left bag. A partition wall 14 (the right partition wall 14R and the left partition wall 14L) that partitions the internal space 10A for each of the adjacent bag portions 11, 12, and 13 is disposed between the portions 13.

すなわちエアバッグ１０の内部空間１０Ａは、仕切り壁１４にてバッグ部１１，１２，１３ごとに仕切られた３つの分割空間１１Ａ，１２Ａ，１３Ａに区分けされている。 That is, the internal space 10 A of the airbag 10 is divided into three divided spaces 11 A, 12 A, 13 A partitioned by the partition wall 14 for each of the bag portions 11, 12, 13.

ただし、仕切り壁１４には、隣り合うバッグ部１１，１２，１３の各分割空間１１Ａ，１２Ａ，１３Ａを連通するように連通孔１４ａが形成されている（同図参照）。これにより、上述したように、エアバッグ１０の内部空間１０Ａは、その幅方向全体に亘って連通している。 However, a communication hole 14a is formed in the partition wall 14 so as to communicate the divided spaces 11A, 12A, and 13A of the adjacent bag portions 11, 12, and 13 (see the same figure). Thereby, as above-mentioned, 10 A of interior spaces of the airbag 10 are connected over the whole width direction.

当例では、図８（ａ）に示すように、仕切り壁１４は、エアバッグ１０の内部空間１０Ａにおける、中央バッグ部１１と外側バッグ部１２，１３との間に対応させて側面視（図７のＢ−Ｂ線断面視）でＣ環をしたシート状に形成されている。連通孔１４ａは、Ｃ環状の仕切り壁１４を周方向に略等分するように６つ配設されており、いずれも仕切り壁１４の外周縁と内周縁との径方向の中間位置を通る円周上に中心部を有する正円形状で形成され、図５に示すように、仕切り壁１４を厚み方向に貫通形成されている。 In this example, as shown in FIG. 8 (a), the partition wall 14 is seen in a side view corresponding to the space between the central bag portion 11 and the outer bag portions 12 and 13 in the internal space 10A of the airbag 10. 7 is a sheet having a C-ring. Six communication holes 14a are arranged so as to divide the C-shaped partition wall 14 in the circumferential direction substantially equally, and all of the communication holes 14a are circles passing through the intermediate position in the radial direction between the outer peripheral edge and the inner peripheral edge of the partition wall 14. It is formed in the shape of a perfect circle having a central portion on the periphery, and is formed so as to penetrate the partition wall 14 in the thickness direction as shown in FIG.

図５に示すように、中央シート１１０と右側シート１２０との各対向縁間には、該仕切り壁１４Ｒの外縁（外周縁および内周縁）が挟み込まれており、この状態で、縫合部１４０は、各シート１１０，１２０および仕切り壁１４Ｒを各対向縁に沿って一体に縫い合わせている。 As shown in FIG. 5, the outer edges (outer peripheral edge and inner peripheral edge) of the partition wall 14R are sandwiched between the opposing edges of the center sheet 110 and the right sheet 120. In this state, the stitching portion 140 is The sheets 110 and 120 and the partition wall 14R are integrally sewn along the opposing edges.

同様に、中央シート１１０と左側シート１３０との各対向縁間には、該仕切り壁１４Ｒの外縁（外周縁および内周縁）が挟み込まれており、この状態で、縫合部１４０は、各シート１１０，１３０および仕切り壁１４Ｌを各対向縁に沿って一体に縫い合わせている。
これにより、内部空間１０Ａにおいてエアバッグ１０の内周面と外周面との夫々に連結するように車幅方向に垂直に配設された仕切り壁１４Ｒ，１４Ｌによってエアバッグ１０が膨張時に所定の展開形状に規制（形状保持）している。 Similarly, the outer edges (outer peripheral edge and inner peripheral edge) of the partition wall 14R are sandwiched between the opposing edges of the central sheet 110 and the left sheet 130. In this state, the stitching portion 140 is connected to each sheet 110. , 130 and the partition wall 14L are sewn together along the opposing edges.
As a result, the airbag 10 is expanded to a predetermined extent when the airbag 10 is inflated by the partition walls 14R and 14L disposed perpendicular to the vehicle width direction so as to be connected to the inner peripheral surface and the outer peripheral surface of the airbag 10 in the internal space 10A. The shape is regulated (shape retention).

なお、仕切り壁１４についても、当例ではバッグ部１１，１２，１３を形成するシート１１０，１２０，１３０と同じ素材で形成されているが、別の素材で形成してもよい。また、バッグ部１１，１２，１３を形成するシート１１０，１２０，１３０と、仕切り壁１４との縫着形態は、上述した縫着形態に限らず、仕切り壁１４によって内部空間１０Ａをバッグ部１１，１２，１３ごとに仕切って分割する構成であれば特に限定しない。 The partition wall 14 is also formed of the same material as the sheets 110, 120, and 130 forming the bag portions 11, 12, and 13 in this example, but may be formed of a different material. Further, the sewing form of the sheets 110, 120, and 130 forming the bag parts 11, 12, and 13 and the partition wall 14 is not limited to the above-described sewing form, and the inner wall 10 A is formed in the bag part 11 by the partition wall 14. , 12 and 13 are not particularly limited as long as they are divided and divided.

続いて車両が衝撃を受けた時におけるエアバッグ装置１の作用について説明する。
上記のインフレータ２は、車両の衝撃を検知するとガスを発生し、ガス供給管６を介してガス流入口７からエアバッグ１０内にガスを供給する。エアバッグ１０は供給されたガスにより、折り畳み形状から膨張して布製のカバー５を押し開いて後方へ展開する。 Next, the operation of the airbag device 1 when the vehicle receives an impact will be described.
The inflator 2 generates gas when the impact of the vehicle is detected, and supplies the gas into the airbag 10 from the gas inlet 7 through the gas supply pipe 6. The airbag 10 is expanded from the folded shape by the supplied gas, pushes the cloth cover 5 open, and expands backward.

ここで、ガス流入口７は中央バッグ部１１に設けられているため、ガス流入口７からエアバッグ１０内に供給された高圧ガスは、中央バッグ部１１の分割空間１１Ａに行き渡るとともに、中央バッグから仕切り壁１４Ｒ，１４Ｌの連通孔１４ａを通じて、該中央バッグ部１１の両サイドに位置する外側バッグ部１２，１３の分割空間１２Ａ，１３Ａへと供給され、側面視で円環状に形成された外側バッグ部１２，１３の分割空間１２Ａ，１３Ａ全体に行き渡り、外側バッグ部１２，１３の各外面部１２ａ，１３ａに設けたベントホール１５から抜けていく（図５、図８（ｂ）中の破線矢印参照）。 Here, since the gas inlet 7 is provided in the central bag portion 11, the high-pressure gas supplied from the gas inlet 7 into the airbag 10 reaches the divided space 11 A of the central bag portion 11, and the central bag. Is supplied to the divided spaces 12A and 13A of the outer bag portions 12 and 13 located on both sides of the central bag portion 11 through the communication holes 14a of the partition walls 14R and 14L, and is formed in an annular shape in a side view. It spreads over the entire divided spaces 12A and 13A of the bag portions 12 and 13 and escapes from the vent holes 15 provided in the outer surface portions 12a and 13a of the outer bag portions 12 and 13 (broken lines in FIGS. 5 and 8B). See arrow).

このように、エアバッグ１０は、展開時に、高圧ガスによって後方へ展開するとともに、中央バッグ部１１から外側バッグ部１２，１３の順に両サイドへ展開する。 As described above, the airbag 10 is deployed rearward by the high-pressure gas when deployed, and is deployed to both sides in the order of the central bag portion 11 and the outer bag portions 12 and 13.

そして、中央バッグ部１１によって後席乗員の頭部および胸部を受け止めるとともに、外側バッグ部１２，１３によって後席乗員の両肩部を受け止めることができる。 The central bag portion 11 can receive the head and chest of the rear seat occupant and the outer bag portions 12 and 13 can receive both shoulders of the rear seat occupant.

図９（ａ）、（ｂ）は、夫々前席が後席乗員に対して通常位置にある場合と、近接した位置にある場合とにおける本実施形態のエアバック装置の作用説明図を示し、図１０は図９（ａ）の場合における、エアバッグに当接した後席乗員に加わる荷重とエアバッグの変位との関係を示す本実施形態のエアバック装置の特性図を示す。 9 (a) and 9 (b) are diagrams illustrating the operation of the airbag apparatus according to the present embodiment when the front seat is in the normal position with respect to the rear seat occupant and when the front seat is in the close position, respectively. FIG. 10 is a characteristic diagram of the airbag apparatus of the present embodiment showing the relationship between the load applied to the rear seat occupant in contact with the airbag and the displacement of the airbag in the case of FIG.

図９（ａ）に示すように、前席１００Ｆが、後席乗員との前後方向の間隔が十分確保されている通常位置にある時にエアバッグ１０が後方へ展開した場合には、図１０のグラフに示すように、エアバッグ１０が後席乗員との当接初期において、貫通空洞部９が潰れることによりエアバッグ１０が圧縮する第１圧縮領域（図１０中のＡｚｏｎｅ参照）と、貫通空洞部９が潰れきった後（すなわち、エアバッグ１０が図９（ｂ）に示すような形状になった後）、内部空間１０Ａの収縮によりエアバッグ１０自体が圧縮する第２圧縮領域（図１０中のＢｚｏｎｅ参照）との２段階の圧縮領域によって、エアバッグ１０は後席乗員が受ける衝撃を吸収しながら後席乗員を受け止めることができる。 As shown in FIG. 9 (a), when the airbag 10 is deployed rearward when the front seat 100F is in a normal position where the front-rear occupant is sufficiently spaced from the rear seat occupant, As shown in the graph, in the initial contact of the airbag 10 with the rear seat occupant, the first compression region (see Azone in FIG. 10) in which the airbag 10 is compressed by the collapse of the through cavity 9, and the through cavity After the portion 9 is completely crushed (that is, after the airbag 10 has a shape as shown in FIG. 9B), the airbag 10 itself is compressed by the contraction of the internal space 10A (FIG. 10). The airbag 10 can receive the rear seat occupant while absorbing the impact received by the rear seat occupant.

一方、前席１００Ｆが、後席乗員との前後方向の間隔が通常位置よりも近接位置にある時にエアバッグ１０が後方へ展開した場合には、第１圧縮領域（図１０中のＡｚｏｎｅ参照）の時間（ストローク）が短くなるものの、この場合においても図１０のグラフに示すような２段階の圧縮領域によって後席乗員が受ける衝撃を吸収しながら後席乗員を受け止めることができる。 On the other hand, when the airbag 10 is deployed rearward when the front seat 100F is positioned closer to the rear seat occupant in the front-rear direction than the normal position, the first compression region (see Azone in FIG. 10). In this case, the rear seat occupant can be received while absorbing the impact received by the rear seat occupant by the two-stage compression region as shown in the graph of FIG.

例えば、前席１００Ｆが後席乗員に極端に近い時に車両衝突があった場合には、衝突時の慣性によって後席乗員が前方へ突き動かされる前、或いはそれと略同時に、該後席乗員が後方へ展開したエアバッグ１０に当接するが、その際には図９（ｂ）に示すように、貫通空洞部９が即時に潰れることで後席乗員が、高圧ガスによって膨張したエアバッグ１０により過度に圧迫されることがなく乗員の攻撃性を低減することができ、後席乗員をしっかりと受け止めて保護することができる。 For example, when a vehicle collision occurs when the front seat 100F is extremely close to the rear seat occupant, the rear seat occupant moves backward or substantially simultaneously with the rear seat occupant being pushed forward by the inertia at the time of the collision. In this case, as shown in FIG. 9B, the through-cavity portion 9 is immediately crushed so that the rear seat occupant is excessively moved by the airbag 10 inflated by the high-pressure gas. The occupant's aggression can be reduced without being pressed, and the rear seat occupant can be firmly received and protected.

すなわち、本実施形態のエアバッグ１０は、前席１００Ｆと後席乗員との前後方向の間隔に関わらず、後席乗員の保護性能を確保することができる。 In other words, the airbag 10 of the present embodiment can ensure the protection performance of the rear seat occupant regardless of the distance in the front-rear direction between the front seat 100F and the rear seat occupant.

そして図６、図７、図８（ａ）に示すように、中央バッグ部１１には、切欠き状空洞部１８を設け、該切欠き状空洞部１８を後席乗員側から覆う窪み被覆布１７を設けたため、エアバッグ１０の展開時には、後席乗員の胸部においては中央バッグ部１１の窪み被覆布１７が当接することになり、高圧ガスによって膨張したエアバッグ１０（中央バッグ本体部１６）が後席乗員の胸部に直接当接することを回避できる。 As shown in FIGS. 6, 7, and 8 (a), the central bag portion 11 is provided with a notch-shaped cavity 18, and the notched cavity 18 covers the notch-shaped cavity 18 from the rear seat occupant side. 17 is provided, when the airbag 10 is deployed, the recessed covering cloth 17 of the central bag portion 11 comes into contact with the chest of the rear seat occupant, and the airbag 10 (central bag main body portion 16) inflated by high-pressure gas. Can be prevented from coming into direct contact with the chest of the rear seat occupant.

本実施の形態に係るエアバッグ装置１は、前席１００Ｆと後席１００Ｒとの相対位置が変更可能に前後方向に少なくとも２列のシート１００Ｆ，１００Ｒを有する車両において、少なくとも前席１００Ｆのシートバック１００ｂの背面に設けられるエアバッグ装置１であって、車両側面視で内側に空洞部としての貫通空洞部９を有する環状に後方へ展開するエアバッグ１０を備え、エアバッグ１０はその車幅方向中央部に、後席乗員から遠ざかるように窪んだ領域（胸部対応領域Ｒ）として設けられた切欠き状空洞部１８を有するとともに、その切欠き状空洞部１８を後席乗員側から覆うように面を有する窪み被覆部材としての窪み被覆布１７が設けられたものである（図１、図６、図７、図８（ａ）参照）。 The airbag apparatus 1 according to the present embodiment is a vehicle having at least two rows of seats 100F and 100R in the front-rear direction so that the relative positions of the front seat 100F and the rear seat 100R can be changed. An airbag device 1 provided on the back surface of 100b includes an airbag 10 that has a through-hole portion 9 as a cavity portion inwardly in a vehicle side view and that is deployed rearward in an annular shape, and the airbag 10 has a vehicle width direction. It has a notch-shaped cavity 18 provided as a region (chest corresponding region R) that is recessed away from the rear seat occupant at the center, and covers the notch-shaped cavity 18 from the rear seat occupant side. A hollow covering cloth 17 as a hollow covering member having a surface is provided (see FIGS. 1, 6, 7, and 8A).

上記構成によれば、後席乗員が前席１００Ｆに近い位置でエアバッグ１０が展開しても、切欠き状空洞部１８を覆う窪み被覆布１７に後席乗員の胸部が当接することで後席乗員の胸部に、高圧ガスによって展開された中央バッグ本体部１６が直接当接することがないため、エアバッグ１０の内側の貫通空洞部９が潰れることとあわせて後席乗員を安定して保護することができる。 According to the above configuration, even if the rear seat occupant is deployed near the front seat 100F, the rear seat occupant is in contact with the recessed covering cloth 17 that covers the notch-shaped cavity 18 so that the rear seat Since the central bag body portion 16 developed by high-pressure gas does not directly contact the chest of the seat occupant, the through-seat cavity 9 inside the airbag 10 is crushed and the rear seat occupant is stably protected. can do.

また、切欠き状空洞部１８を窪み被覆布１７によって後席乗員から覆うことにより、後席乗員が子供である場合や適切な着座姿勢で後席１００Ｒに着座していない場合等においても、切欠き状空洞部１８に後席乗員の体の一部である頭部等が入り込むことを阻止することができる。 Further, by covering the notch-shaped cavity 18 from the rear seat occupant with the depression covering cloth 17, the rear seat occupant is cut off even when the rear seat occupant is a child or not seated on the rear seat 100R in an appropriate seating posture. It is possible to prevent the head portion, which is a part of the body of the rear seat occupant, from entering the notch-shaped cavity 18.

この発明の態様として、エアバッグ１０は、その車幅方向に３つのバッグ部１１，１２，１３が車幅方向に並設された構成とし、これら３つのバッグ部１１，１２，１３のうち車幅方向において最も外側に位置しない中央バッグ部１１が後席乗員に向かって開いた車両側面視Ｃ型であり、中央バッグ部１１は、車両側面視でその周方向において後席乗員側が切欠き状に設けられた切欠き状空洞部１８（切欠き部）を備えたものである（図６、図７、図８（ａ）参照）。 As an aspect of the present invention, the airbag 10 has a configuration in which three bag portions 11, 12, 13 are arranged in parallel in the vehicle width direction. The central bag portion 11 that is not located on the outermost side in the width direction is a C-type vehicle side view opened toward the rear seat occupant, and the central bag portion 11 is notched on the rear seat occupant side in the circumferential direction in the vehicle side view. Is provided with a notch-shaped cavity 18 (notch) (see FIGS. 6, 7, and 8A).

上記構成によれば、エアバッグ１０の展開時に窪み領域（胸部対応領域Ｒ）としての切欠き状空洞部１８が確実に形成され、その切欠き状空洞部１８を簡単な構成である窪み被覆布１７（布部材）にて覆うことができるため、エアバッグ１０の展開状態において、後席乗員が切欠き状空洞部１８に入り込まないように安定して保護することができる。 According to the above configuration, when the airbag 10 is deployed, the notch-shaped cavity 18 as the recess region (chest corresponding region R) is reliably formed, and the notch-shaped cavity 18 has a simple configuration. 17 (cloth member), it is possible to stably protect the rear seat occupant from entering the notch-shaped cavity 18 when the airbag 10 is deployed.

またこの発明の態様として、窪み被覆布１７は、エアバッグ１０の切欠き状空洞部１８の周縁全体に縫着されたものである（図１参照）。 Moreover, as an aspect of the present invention, the hollow covering cloth 17 is sewn on the entire periphery of the notch-shaped cavity 18 of the airbag 10 (see FIG. 1).

上記構成によれば、窪み被覆布１７をエアバッグ１０の切欠き状空洞部１８の周縁にしっかりと取り付けることができるため、切欠き状空洞部１８を覆う窪み被覆布１７が後席乗員に当接することで、その衝撃をしっかりと受け止めることができつつ、窪み被覆布１７により切欠き状空洞部１８をしっかりと覆うことで、該切欠き状空洞部１８に後席乗員の体の一部が入り込むことを確実に防ぐことができるため、後席乗員を安定して保護することができる。 According to the above configuration, since the hollow covering cloth 17 can be firmly attached to the peripheral edge of the cutout cavity 18 of the airbag 10, the hollow covering cloth 17 covering the cutout hollow 18 is applied to the rear seat occupant. By touching, the impact is firmly received, and the notched cavity portion 18 is firmly covered with the recess covering cloth 17 so that a part of the body of the rear seat occupant is placed in the notched cavity portion 18. Since it can prevent reliably entering, a backseat passenger | crew can be protected stably.

この発明は、上述の実施例の構成のみに限定されるものではなく様々な実施形態で形成することができる。
例えば、窪み被覆布１７をエアバッグ１０の切欠き状空洞部１８の周縁にしっかりと取り付けることができる構成であれば、縫合に限らず、接着、溶着等により取り付けてもよい。 The present invention is not limited to the configuration of the above-described embodiment, and can be formed in various embodiments.
For example, as long as it is a structure which can attach the hollow covering cloth 17 to the periphery of the notch-shaped cavity part 18 of the airbag 10, you may attach not only with sewing but by adhesion | attachment, welding, etc.

また、エアバッグ１０の外周面における、後席乗員から遠ざかるように窪んだ領域（胸部対応領域Ｒ）は、切欠き状空洞部１８のように、環状のエアバッグ１０の外周面から貫通空洞部９に径方向に連通するように設けるに限らず、貫通空洞部９と連通しないようにエアバッグ１０の外周面に対して窪んだ凹部であってもよい。 In addition, a region (chest corresponding region R) that is recessed away from the rear seat occupant on the outer peripheral surface of the airbag 10 is a through-cavity portion from the outer peripheral surface of the annular airbag 10, like the notch-shaped cavity portion 18. 9 is not limited to be provided so as to communicate with the radial direction, but may be a recess that is recessed with respect to the outer peripheral surface of the airbag 10 so as not to communicate with the through cavity 9.

さらにまた、エアバッグ１０の展開時の形状保持性を高める手段として、内部空間１０Ａに上述した仕切り壁１４を設けた構成に限らず、例えば、エアバッグ１０を形成するシート１１０，１２０，１３０の周方向の各部を連結するように内部空間１０Ａにおいて紐等をテザーとして張架した構成を採用することができる。 Furthermore, as a means for enhancing the shape retaining property when the airbag 10 is deployed, the configuration is not limited to the configuration in which the partition wall 14 described above is provided in the internal space 10A. For example, the seats 110, 120, and 130 that form the airbag 10 A configuration in which a string or the like is stretched as a tether in the internal space 10A so as to connect the respective parts in the circumferential direction can be employed.

また、エアバッグ１０は、全体として奇数個のバッグ部１１，１２，１３を備えた構成、具体的には、１つの中央バッグ部１１と、該中央バッグ部１１の左右両側に同数ずつ配設した外側バッグ部１２，１３とを備えた構成であれば、３個に限らず、５個以上の奇数個を備えた構成とすることができる。 The airbag 10 has an odd number of bag portions 11, 12, and 13 as a whole, specifically, one central bag portion 11 and the same number of left and right sides of the central bag portion 11. If it is the structure provided with the outer bag parts 12 and 13 which were made, it can be set as the structure provided with not only three but the odd number of five or more.

また言うまでもなく、エアバッグ装置１は、車幅方向に並設された運転席と助手席との双方の前席１００Ｆのシートバック１００ｂの背面に設けるに限らず、一方の前席１００Ｆのシートバック１００ｂの背面に設けることができる。また、前後方向に３列以上のシートを有する車両においては、エアバッグ装置１を最前列のシートのシートバック１００ｂの背面に設けるに限らず、最後列より前列のシートのシートバック１００ｂの背面に設けることができる。 Needless to say, the airbag device 1 is not limited to the back of the seat back 100b of the front seat 100F of both the driver seat and the passenger seat arranged side by side in the vehicle width direction, but the seat back of one front seat 100F. It can be provided on the back surface of 100b. Further, in a vehicle having three or more rows of seats in the front-rear direction, the airbag device 1 is not limited to the back of the seat back 100b of the front row seat, Can be provided.

さらにまた、本実施形態では、前席１００Ｆを後席１００Ｒに対して前後方向の相対位置が変位可能に構成したが、この構成に限らず、前席１００Ｆと後席１００Ｒとのうち少なくとも一方を前後方向にスライド可能に構成した構成を採用することにより、前席１００Ｆと後席１００Ｒとが前後方向に相対変位可能に構成してもよい。 Furthermore, in the present embodiment, the front seat 100F is configured to be displaceable in the front-rear direction relative to the rear seat 100R. However, the present invention is not limited to this configuration, and at least one of the front seat 100F and the rear seat 100R is used. By adopting a configuration configured to be slidable in the front-rear direction, the front seat 100F and the rear seat 100R may be configured to be relatively displaceable in the front-rear direction.

１…エアバッグ装置
９…貫通空洞部（空洞部）
１０…エアバッグ
１１，１２，１３…バッグ部
１１…中央バッグ部（車幅方向において最も外側に位置しないバッグ部）
１７…窪み被覆布（窪み被覆部材、布部材）
１８…切欠き状空洞部（切欠き部）
１００…シート
１００Ｆ…前席
１００Ｒ…後席
１００ｂ…シートバック
Ｒ…胸部対応領域（窪み領域） DESCRIPTION OF SYMBOLS 1 ... Airbag apparatus 9 ... Through-hole part (cavity part)
10. Airbag 11, 12, 13 ... Bag part 11 ... Central bag part (bag part not located on the outermost side in the vehicle width direction)
17 ... depression coating cloth (dent coating member, cloth member)
18 ... notch-shaped cavity (notch)
100 ... Seat 100F ... Front seat 100R ... Rear seat 100b ... Seat back R ... Chest corresponding area (recessed area)

Claims

In a vehicle having at least two rows of seats in the front-rear direction so that the relative positions of the front seat and the rear seat can be changed, an airbag device provided at least on the back of the seat back of the front seat,
An airbag that is deployed rearward in an annular shape having a hollow portion inside as viewed from the side of the vehicle,
The airbag has an indented area at the center in the vehicle width direction so as to be away from the rear seat occupant, and a recess covering member having a surface so as to cover the indented area from the rear seat occupant side. apparatus.

The airbag has a configuration in which three or more bag portions are juxtaposed in the vehicle width direction in the vehicle width direction,
Of these plurality of bag portions, the bag portion that is not located on the outermost side in the vehicle width direction is a vehicle side view C-type opened toward the rear seat occupant,
The indentation area is a notch provided in a cutout shape on the rear seat occupant side in the circumferential direction of the C-shaped bag portion in a side view of the vehicle, and the indentation covering member is a cloth member that covers the notch portion. The airbag device according to claim 1, which is formed by:

The airbag apparatus according to claim 2, wherein the cloth member is sewn to the entire periphery of the notch of the airbag.