JP6824655B2

JP6824655B2 - Airbag

Info

Publication number: JP6824655B2
Application number: JP2016147079A
Authority: JP
Inventors: 和茂橋本
Original assignee: Nihon Plast Co Ltd
Current assignee: Nihon Plast Co Ltd
Priority date: 2016-07-27
Filing date: 2016-07-27
Publication date: 2021-02-03
Anticipated expiration: 2036-07-27
Also published as: JP2018016165A

Description

本発明は、車室内の座席の側方の所定面に沿って展開し車幅方向に膨張するエアバッグ本体部を備えたエアバッグに関する。 The present invention relates to an airbag having an airbag main body that expands along a predetermined side surface of a seat in the vehicle interior and expands in the vehicle width direction.

従来、ガスが導入されて膨張展開するエアバッグを備えたエアバッグ装置について、自動車の車室の側部のピラー部及びドアの窓部などを含む所定面に沿ってエアバッグを展開するいわゆるカーテンエアバッグ装置が知られている。このようなエアバッグ装置のエアバッグは、通常時は細長く折り畳まれ、窓部の上縁部のルーフサイド部に沿って配置されている。そして、側面衝突や横転（ロールオーバー）などの衝撃を受けた際に、インフレータからガスが供給され、エアバッグが側部の窓ガラスなどに沿って下方に膨張展開して、乗員を拘束して頭部などを保護する。 Conventionally, with respect to an airbag device equipped with an airbag that expands and expands by introducing gas, a so-called curtain that deploys the airbag along a predetermined surface including a pillar portion on the side of the passenger compartment of an automobile and a window portion of a door. Airbag devices are known. The airbag of such an airbag device is normally elongated and folded, and is arranged along the roof side portion of the upper edge portion of the window portion. Then, when it receives an impact such as a side collision or rollover, gas is supplied from the inflator, and the airbag expands and expands downward along the side window glass, etc., and restrains the occupant. Protect the head etc.

このようなエアバッグ装置において、例えば頭部保護領域を増加させるために、乗員側に膨張する気室と車体側に膨張する気室とを前後に交互に配置し、各気室の背面側を非膨張部とすることで、膨張時のエアバッグ厚みを均一化した構成（例えば、特許文献１参照。）、及び、エアバッグの内部の乗員側と車体側とを多数の制限糸によって接続することで、膨張時のエアバッグ厚みを均一化した構成（例えば、特許文献２参照。）などが知られている。 In such an airbag device, for example, in order to increase the head protection area, air chambers that expand toward the occupant side and air chambers that expand toward the vehicle body side are alternately arranged in the front-rear direction, and the back side of each air chamber is arranged. By forming the non-expandable portion, the thickness of the airbag during expansion is made uniform (see, for example, Patent Document 1), and the occupant side and the vehicle body side inside the airbag are connected by a large number of limiting threads. As a result, a configuration in which the thickness of the airbag during expansion is made uniform (see, for example, Patent Document 2) is known.

特開２００４−２６８８８０号公報（第３−７頁、図３）Japanese Unexamined Patent Publication No. 2004-268880 (Page 3-7, Fig. 3) 国際公開第２０１５／００５３０８号（第５−７頁、図２）International Publication No. 2015/005308 (page 5-7, Fig. 2)

しかしながら、上述の特許文献１の構成の場合には、多数の基布が必要となり、特許文献２記載の構成の場合には、製造するための特殊な設備が必要になる。 However, in the case of the configuration of Patent Document 1 described above, a large number of base fabrics are required, and in the case of the configuration described in Patent Document 2, special equipment for manufacturing is required.

また、近年、斜め衝突時に乗員頭部がエアバッグ接触時に回転する場合があり、これを抑制するために、頭部をより広く平坦な気室で拘束することが望まれる。 Further, in recent years, the occupant's head may rotate at the time of contact with the airbag during an oblique collision, and in order to suppress this, it is desired to restrain the head in a wider and flat air chamber.

本発明は、このような点に鑑みなされたもので、安価な構成で乗員の頭部をより効果的に拘束できるエアバッグを提供することを目的とする。 The present invention has been made in view of such a point, and an object of the present invention is to provide an airbag that can more effectively restrain the head of an occupant with an inexpensive configuration.

請求項１記載のエアバッグは、袋状に形成され、折り畳まれた状態からガスが供給されて、車室内の座席の側方の所定面に沿って展開し車幅方向に膨張するエアバッグ本体部を備えたエアバッグであって、前記エアバッグ本体部は、外縁部を接合する外縁エアバッグ接合部と、この外縁エアバッグ接合部の下部から上方へと延びる基端側よりも先端側が前方かつ上方に位置し、かつ上方に凸でない部分を少なくとも一部に含むように湾曲された非膨張部と、この非膨張部及び前記外縁エアバッグ接合部により下部が区画され前記座席に着座する乗員の頭部を拘束する気室とを備え、前記気室は、後方から前方に向かい徐々に小さくなるように形成されるものである。 The airbag according to claim 1 is an airbag body that is formed in a bag shape, is supplied with gas from a folded state, expands along a predetermined side surface of a seat in the vehicle interior, and expands in the vehicle width direction. An airbag provided with a portion, the airbag main body portion has an outer edge airbag joint portion for joining the outer edge portion and a tip side forward of the base end side extending upward from the lower portion of the outer edge airbag joint portion. A non-inflated portion that is located above and is curved so as to include at least a part that is not convex upward, and a occupant whose lower portion is partitioned by the non-inflated portion and the outer edge airbag joint portion and is seated in the seat. It is provided with an air chamber that restrains the head of the air chamber, and the air chamber is formed so as to gradually decrease from the rear to the front .

請求項２記載のエアバッグは、請求項１記載のエアバッグにおいて、非膨張部は、基端側から先端側へと階段状に形成されたものである。 The airbag according to claim 2 is the airbag according to claim 1, wherein the non-expandable portion is formed in a stepped manner from the proximal end side to the distal end side.

請求項３記載のエアバッグは、請求項１または２記載のエアバッグにおいて、エアバッグ本体部は、非膨張部により上部が区画された副室と、この副室を気室と連通しこの気室から前記副室へと流入するガスが通過するとともにこのガスを規制して通気抵抗を生じさせる通気口とを備えたものである。 The airbag according to claim 3 is the airbag according to claim 1 or 2, wherein the airbag main body has a sub-chamber whose upper portion is partitioned by a non-expanding portion, and this sub-chamber communicates with an air chamber. It is provided with a vent that allows gas flowing from the chamber to the sub chamber to pass through and regulates this gas to generate ventilation resistance.

請求項１記載のエアバッグによれば、外縁エアバッグ接合部の下部から上方へと延びる基端側よりも先端側が前方かつ上方に位置し、かつ上方に凸でない部分を少なくとも一部に含むように湾曲させた非膨張部及び外縁エアバッグ接合部により気室の下部を区画するとともに、気室を後方から前方に向かい徐々に小さくなるように形成することで、例えば他の部材や特殊な設備などを用いることなく、座席に着座した乗員の頭部の側部前側から側部後側に亘って気室によって拘束できて頭部の上下軸方向の回転を抑制でき、安価な構成で乗員の頭部をより効果的に拘束できる。 According to the airbag according to claim 1, the tip side is located forward and above the proximal end side extending upward from the lower part of the outer edge airbag joint portion, and at least a part thereof is not convex upward. The lower part of the air chamber is partitioned by a non-expanded part and an outer edge airbag joint that are curved to, and the air chamber is formed so as to gradually decrease from the rear to the front , for example, other members and special equipment. The occupant's head seated in the seat can be restrained by the air chamber from the front side to the rear side of the head, and the rotation of the head in the vertical axis direction can be suppressed. The head can be restrained more effectively.

請求項２記載のエアバッグによれば、請求項１記載のエアバッグの効果に加えて、非膨張部を、基端側から先端側へと階段状に形成することで、基端側よりも先端側が上方に位置し、かつ上方に凸でない部分を少なくとも一部に含むように湾曲する非膨張部を容易に構成できる。 According to the airbag according to claim 2, in addition to the effect of the airbag according to claim 1, the non-expandable portion is formed stepwise from the proximal end side to the distal end side, so that the non-expandable portion is formed in a stepped manner from the proximal end side. A non-expanding portion that is curved so that the tip side is located upward and includes a portion that is not convex upward can be easily configured.

請求項３記載のエアバッグによれば、請求項１または２記載のエアバッグの効果に加えて、エアバッグ本体部に非膨張部によって上部を区画する副室を設け、この副室と気室とを連通する通気口が、気室から副室へと流入するガスを規制して通気抵抗を生じさせるので、ガスが副室へと徐々に流入し、気室を適切な内圧に保持できる。 According to the airbag according to claim 3, in addition to the effect of the airbag according to claim 1 or 2, an auxiliary chamber is provided in the airbag main body portion by a non-expanding portion, and the auxiliary chamber and the air chamber are provided. Since the vent that communicates with and regulates the gas flowing from the air chamber to the sub chamber and causes ventilation resistance, the gas gradually flows into the sub chamber and the air chamber can be maintained at an appropriate internal pressure.

本発明の第１の実施の形態のエアバッグの一部を示す側面図である。It is a side view which shows a part of the airbag of the 1st Embodiment of this invention. （ａ1）は同上エアバッグの一部を示す側面図、（ａ2）は（ａ1）の気室と乗員の頭部との位置関係を上方から模式的に示す説明図、（ｂ1）は一の比較例のエアバッグの一部を示す側面図、（ｂ2）は（ｂ1）の気室と乗員の頭部との位置関係を上方から模式的に示す説明図、（ｃ1）は他の比較例のエアバッグの一部を示す側面図、（ｃ2）は（ｃ1）の気室と乗員の頭部との位置関係を上方から模式的に示す説明図である。(A1) is a side view showing a part of the airbag as above, (a2) is an explanatory view schematically showing the positional relationship between the air chamber of (a1) and the occupant's head from above, and (b1) is one. A side view showing a part of the airbag of the comparative example, (b2) is an explanatory view schematically showing the positional relationship between the air chamber of (b1) and the occupant's head from above, and (c1) is another comparative example. A side view showing a part of the airbag, (c2) is an explanatory view schematically showing the positional relationship between the air chamber of (c1) and the head of the occupant from above. （ａ1）は図２（ａ1）のＩ−Ｉ断面図、（ａ2）は図２（ａ1）のII−II断面図、（ａ3）は図２（ａ1）のIII−III断面図、（ｂ1）は図２（ｂ1）のIV−IV断面図、（ｂ2）は図２（ｂ1）のＶ−Ｖ断面図、（ｂ3）は図２（ｂ1）のVI−VI断面図である。(A1) is an I-I sectional view of FIG. 2 (a1), (a2) is a II-II sectional view of FIG. 2 (a1), (a3) is a III-III sectional view of FIG. 2 (a1), and (b1). ) Is an IV-IV sectional view of FIG. 2 (b1), (b2) is a VV sectional view of FIG. 2 (b1), and (b3) is a VI-VI sectional view of FIG. 2 (b1). （ａ）は同上エアバッグの気室と乗員の頭部との位置関係を正面側から模式的に示す説明図、（ｂ）はさらに他の比較例のエアバッグの気室と乗員の頭部との位置関係を正面側から模式的に示す説明図である。(A) is an explanatory view schematically showing the positional relationship between the airbag air chamber and the occupant's head from the front side, and (b) is the airbag air chamber and the occupant's head of another comparative example. It is explanatory drawing which shows typically the positional relationship with and from the front side. 同上エアバッグを車体に取り付けた状態を車室内部側から示す側面図である。It is a side view which shows the state which the airbag is attached to the vehicle body from the vehicle interior side. 本発明の第２の実施の形態のエアバッグの一部を示す側面図である。It is a side view which shows a part of the airbag of the 2nd Embodiment of this invention. 本発明の第３の実施の形態のエアバッグの一部を示す側面図である。It is a side view which shows a part of the airbag of the 3rd Embodiment of this invention. 本発明の第４の実施の形態のエアバッグの一部を示す側面図である。It is a side view which shows a part of the airbag of the 4th Embodiment of this invention.

以下、本発明の第１の実施の形態の構成を図１ないし図５を参照して説明する。 Hereinafter, the configuration of the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

図５において、10はエアバッグで、このエアバッグ10を備えたエアバッグ装置11は、カーテンエアバッグ装置とも呼ばれ、車両である自動車の車体の車室14の収納位置としてのルーフサイド部15に配置されている。そして、このエアバッグ10は、カーテンエアバッグ、側突用エアバッグ、インフレータブルカーテン、あるいは頭部保護用エアバッグなどとも呼ばれるもので、側面衝突の衝撃を受けた際や横転（ロールオーバー）の際などに、被保護物としての乗員の側方にほぼ面状に所定方向である下方へと展開し、乗員の頭部などを保護するようになっている。 In FIG. 5, reference numeral 10 denotes an airbag, and the airbag device 11 provided with the airbag 10 is also called a curtain airbag device, and the roof side portion 15 as a storage position of the passenger compartment 14 of the vehicle body of the automobile body. It is located in. The airbag 10 is also called a curtain airbag, a side collision airbag, an inflatable curtain, or a head protection airbag, and is used when it receives a side collision impact or rolls over. For example, it expands downward in a predetermined direction in a substantially planar manner on the side of the occupant as a protected object to protect the occupant's head and the like.

なお、以下、前後方向、車幅方向である両側方向、上下方向などの方向は、車両の直進方向を基準とし、前側方向（矢印Ｆ方向）、後側方向（矢印Ｒ方向）、上方（矢印Ｕ方向）、下方（矢印Ｄ方向）、車室14の外方（矢印Ｗ方向）、車室14の内方（矢印Ｃ方向）などを説明する。 In the following, the directions such as the front-rear direction, the vehicle width direction, both sides direction, and the vertical direction are based on the straight-ahead direction of the vehicle, and are the front side direction (arrow F direction), the rear side direction (arrow R direction), and the upward direction (arrow). The U direction), the downward direction (arrow D direction), the outside of the passenger compartment 14 (arrow W direction), the inside of the passenger compartment 14 (arrow C direction), and the like will be described.

そして、この自動車の車体は、車室14内に乗員が着座可能な座席である図示しない前席及び後席を備え、これら前席及び後席に対応して、それぞれ上部に開口可能なガラスにより覆われた（第１及び第２の）窓部（サイドウィンドウ）18，19を備えた図示しないドアが設けられている。また、車室14の両側には、前側から順に、Ａピラーとも呼ばれる（第１の）柱状体としてのフロントピラー21、Ｂピラーとも呼ばれる（第２の）柱状体としてのセンターピラー22、Ｃピラーとも呼ばれる（第３の）柱状体としてのリアピラー23が設けられており、フロントピラー21の後方でかつセンターピラー22の前方に窓部18が位置し、センターピラー22の後方でかつリアピラー23の前方に窓部19が位置している。そして、これら窓部18，19、ドア及び各ピラー21，22，23により、車室14の両側部にエアバッグ10が展開する所定面24が構成されている。また、これらピラー21，22，23の上側、すなわち窓部18，19の一縁部である上縁部に、ルーフサイドレールなどとも呼ばれる被取付部材を構成する車体パネル25が設けられ、この車体パネル25を介して天井部としての天井パネルが支持されている。また、両側のフロントピラー21の前側にはフロントガラス（フロントウインドシールド）が設けられ、両側のリアピラー23の後側にはリアガラスが設けられている。そして、収納位置としてのルーフサイド部15は、天井パネルの両側の縁部の部分から、この縁部の部分といわば交差する方向に伸びるフロントピラー21及びリアピラー23のほぼ全長にかかる部分にまで設定され、これら天井パネルの縁部の部分とフロントピラー21及びリアピラー23とで仮想的に構成される弧の内側に所定面24が設定される。 The body of this automobile is provided with front seats and rear seats (not shown), which are seats on which occupants can sit in the passenger compartment 14, and the front and rear seats are corresponding to the front and rear seats, each of which is made of glass that can be opened at the top. A door (not shown) with covered (first and second) windows (side windows) 18, 19 is provided. Further, on both sides of the passenger compartment 14, in order from the front side, the front pillar 21 as the (first) pillar body also called the A pillar, the center pillar 22 as the (second) pillar body also called the B pillar, and the C pillar. The rear pillar 23 as a (third) columnar body, also called, is provided, and the window portion 18 is located behind the front pillar 21 and in front of the center pillar 22, behind the center pillar 22 and in front of the rear pillar 23. The window 19 is located in. The windows 18, 19, the doors, and the pillars 21, 22, and 23 form predetermined surfaces 24 on which the airbag 10 is deployed on both sides of the passenger compartment 14. Further, on the upper side of these pillars 21, 22 and 23, that is, on the upper edge portion which is one edge portion of the window portions 18 and 19, a vehicle body panel 25 constituting a mounted member called a roof side rail or the like is provided. A ceiling panel as a ceiling portion is supported via the panel 25. Further, a windshield (front windshield) is provided on the front side of the front pillars 21 on both sides, and a rear glass is provided on the rear side of the rear pillars 23 on both sides. The roof side portion 15 as a storage position is set from the edge portions on both sides of the ceiling panel to the portion extending over the entire length of the front pillar 21 and the rear pillar 23 extending in the direction of intersecting the edge portion. A predetermined surface 24 is set inside an arc that is virtually formed by the edge portion of the ceiling panel and the front pillar 21 and the rear pillar 23.

なお、ここで、センターピラー22とは、前後の端部のピラー部ではなく、展開したエアバッグ10に覆われるピラー部を示す。また、車両の種類によっては、片側に例えば４本以上のピラー部を備える場合があるが、前から３本目以後のピラー部は、リアピラー23として説明する。 Here, the center pillar 22 does not mean a pillar portion at the front and rear ends, but a pillar portion covered with the deployed airbag 10. Further, depending on the type of vehicle, for example, four or more pillar portions may be provided on one side, but the third and subsequent pillar portions from the front will be described as the rear pillar 23.

そして、エアバッグ装置11は、前席及び後席の乗員を保護可能な、いわゆる前後席用エアバッグであり、車体パネル25と各ピラー21，22，23の上端から天井へと連続する内装材としての天井被覆部材であるヘッドライニングとなどに囲まれたルーフサイド部15すなわち車体のドア開口部の上縁に沿って細長く折り畳んで収納されたエアバッグ10と、後席の後方あるいは上方に収納されこのエアバッグ10にガスを供給するガス発生器であるインフレータ27となどを備えている。また、このエアバッグ装置11は、エアバッグ10を車体パネルに取り付ける金属板をプレス加工などして形成された図示しないブラケット、及び折り畳んだエアバッグ10の形状を保持する破断可能な筒状あるいは紐状の形状保持部材としてのスリーブ、エアバッグ10の前端部に連結されたテザー部としてのテザーベルト29などが備えられている。また、ドアは、ドアパネルの車室14の室内側が内装材であるドアトリムＴ（図４（ａ）及び図４（ｂ））により覆われ、各ピラー21，22，23のそれぞれの車室14の室内側は、構造物としてのカバー体すなわち被覆内装材であるピラーガーニッシュにより覆われている。 The airbag device 11 is a so-called front and rear airbag that can protect the occupants of the front and rear seats, and is an interior material that is continuous from the upper ends of the vehicle body panel 25 and the pillars 21, 22, and 23 to the ceiling. The roof side portion 15 surrounded by the head lining, which is a ceiling covering member, that is, the airbag 10 folded and stored along the upper edge of the door opening of the vehicle body, and stored behind or above the rear seats. It is equipped with an inflator 27, which is a gas generator that supplies gas to the airbag 10. Further, the airbag device 11 includes a bracket (not shown) formed by pressing a metal plate for attaching the airbag 10 to the vehicle body panel, and a breakable tubular or string that holds the shape of the folded airbag 10. A sleeve as a shape-retaining member, a tether belt 29 as a tether portion connected to the front end of the airbag 10, and the like are provided. Further, in the door, the interior side of the passenger compartment 14 of the door panel is covered with the door trim T (FIGS. 4 (a) and 4 (b)) which is an interior material, and the interior side of each of the passenger compartments 14 of the pillars 21, 22 and 23 is covered. The interior side is covered with a cover body as a structure, that is, a pillar garnish which is a covering interior material.

そして、図１ないし図５に示すエアバッグ10は、インフレータ27が挿入接続されガスが導入されるインフレータ接続部としてのガス導入部32と、扁平な袋状に形成されたエアバッグ本体部33とを備え、複数の取付部34を介して上縁部の複数箇所が車体側に取り付けられるとともに、例えば前端部がテザーベルト29により車体側に取り付けられて、細長く折り畳んだ状態でセンターピラー22の上方であるルーフサイド部15に前後方向に沿って長手状に収納される。本実施の形態では、エアバッグ10は、いわゆるセンターマウントタイプのものであり、ガス導入部32が例えばエアバッグ本体部33の上部の前後方向の中央部に突設されている。 The airbag 10 shown in FIGS. 1 to 5 includes a gas introduction portion 32 as an inflator connection portion into which the inflator 27 is inserted and connected to introduce gas, and an airbag main body portion 33 formed in a flat bag shape. A plurality of upper edge portions are attached to the vehicle body side via a plurality of attachment portions 34, and for example, the front end portion is attached to the vehicle body side by a tether belt 29 and is folded in an elongated state above the center pillar 22. It is stored in a roof side portion 15 in a longitudinal direction along the front-rear direction. In the present embodiment, the airbag 10 is of a so-called center mount type, and the gas introduction portion 32 is projected from, for example, the central portion in the front-rear direction of the upper portion of the airbag main body portion 33.

ガス導入部32及びエアバッグ本体部33は、単数または複数の基布により構成されており、例えばエアバッグ10の外縁部が外縁エアバッグ接合部36により接合されることによりこのエアバッグ10にそれぞれ設定されている。そして、ガス導入部32の後端部（上端部）が、インフレータ27が挿入される挿入開口38となっている。 The gas introduction portion 32 and the airbag main body portion 33 are composed of a single or a plurality of base fabrics. For example, the outer edge portion of the airbag 10 is joined by the outer edge airbag joint portion 36 to be joined to the airbag 10, respectively. It is set. The rear end (upper end) of the gas introduction portion 32 is an insertion opening 38 into which the inflator 27 is inserted.

そして、エアバッグ本体部33は、ガスの流れを規制する複数の規制部である接合部41により、ガスの導入によって膨張する複数の膨張部42が形成される。接合部41は、例えば外縁エアバッグ接合部36に連続する縫製部として形成され、この接合部41には、本実施の形態では、第１ないし第４の規制部としての第１ないし第４の接合部45，46，47，48がそれぞれ設定されている。また、接合部41は、それぞれ線状に形成されており、先端部には、基布が円形状に接合された保護部41aが形成されている。このような保護部41aが設けられることにより、膨張展開時における基布の伸びの確保と皺の発生の防止、また、エアバッグ本体部33の膨張展開時に接合部41の端部へ生じる応力集中に対して充分な強度を得ることができる。 Then, in the airbag main body 33, a plurality of expansion portions 42 that expand due to the introduction of gas are formed by the joint portions 41 that are a plurality of regulation portions that regulate the flow of gas. The joint 41 is formed as, for example, a sewn portion continuous with the outer edge airbag joint 36, and the joint 41 has, in the present embodiment, the first to fourth regulation portions as the first to fourth regulation portions. Joints 45, 46, 47, 48 are set respectively. Further, each of the joint portions 41 is formed in a linear shape, and a protective portion 41a in which the base cloth is joined in a circular shape is formed at the tip portion. By providing such a protective portion 41a, the elongation of the base cloth is ensured during expansion and deployment, the occurrence of wrinkles is prevented, and the stress concentration generated at the end of the joint portion 41 during expansion and deployment of the airbag main body 33 is achieved. Sufficient strength can be obtained.

第１の接合部45は、（第１の）非膨張部として形成され、第２ないし第４の接合部46〜48よりも前方に離間されて位置している。すなわち、この第１の接合部45は、接合部41のうち最前部に位置するものである。本実施の形態において、この第１の接合部45は、エアバッグ10（エアバッグ本体部33）の展開状態で、エアバッグ本体部33の前端部近傍に配置され、フロントピラー21の上端近傍に基端側が位置している。すなわち、この第１の接合部45は、エアバッグ10（エアバッグ本体部33）の展開状態で、前席に着座した乗員の頭部よりも前方に位置している。そして、この第１の接合部45は、上下方向に沿って形成されている。具体的に、この第１の接合部45は、エアバッグ本体部33（外縁エアバッグ接合部36）の上縁部を基端部とし、先端部が前方下側に向けて傾斜する、屈曲部を有さない直線状に形成され、先端部がエアバッグ本体部33（外縁エアバッグ接合部36）の下縁部に対して離間されている。 The first joint 45 is formed as a (first) non-expanding portion and is located in front of the second to fourth joints 46-48. That is, the first joint portion 45 is located at the foremost portion of the joint portion 41. In the present embodiment, the first joint portion 45 is arranged near the front end portion of the airbag main body 33 in the deployed state of the airbag 10 (airbag main body 33), and is located near the upper end of the front pillar 21. The base end side is located. That is, the first joint portion 45 is located in front of the head of the occupant seated in the front seat in the deployed state of the airbag 10 (airbag main body portion 33). The first joint portion 45 is formed along the vertical direction. Specifically, the first joint portion 45 is a bent portion in which the upper edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36) is used as the base end portion and the tip portion is inclined toward the front lower side. The tip portion is separated from the lower edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36).

第２の接合部46は、（第２の）非膨張部として形成され、第１の接合部45よりも後方で、かつ、第３及び第４の接合部47，48よりも前方に位置している。本実施の形態において、この第２の接合部46は、エアバッグ本体部33の前後方向の略中央部に位置している。この第２の接合部46は、エアバッグ10（エアバッグ本体部33）の展開状態で、前席の側方に対向する位置でセンターピラー22の前縁部近傍に位置している。すなわち、この第２の接合部46は、エアバッグ10（エアバッグ本体部33）の展開状態で、前席に着座した乗員の頭部よりも後方に位置している。そして、この第２の接合部46は、上下方向に沿って形成されている。具体的に、この第２の接合部46は、エアバッグ本体部33（外縁エアバッグ接合部36）の下縁部を基端部とし、先端部が後方上側に向けて傾斜する、屈曲部を有さない直線状に形成され、先端部がエアバッグ本体部33（外縁エアバッグ接合部36）の上縁部に対して離間されている。また、この第２の接合部46は、先端部がガス導入部32の下部に対して離間されて対向して位置している。さらに、この第２の接合部46は、第１の接合部45と略平行に形成されている。 The second joint 46 is formed as a (second) non-expanding portion and is located behind the first joint 45 and anterior to the third and fourth joints 47 and 48. ing. In the present embodiment, the second joint portion 46 is located at a substantially central portion in the front-rear direction of the airbag main body portion 33. The second joint portion 46 is located near the front edge portion of the center pillar 22 at a position facing the side of the front seat in the deployed state of the airbag 10 (airbag main body portion 33). That is, the second joint portion 46 is located behind the head of the occupant seated in the front seat in the deployed state of the airbag 10 (airbag main body portion 33). The second joint 46 is formed along the vertical direction. Specifically, the second joint portion 46 has a bent portion in which the lower edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36) is used as the base end portion and the tip portion is inclined toward the rear upper side. It is formed in a straight line that does not exist, and the tip portion is separated from the upper edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36). Further, the tip portion of the second joint portion 46 is located so as to face the lower portion of the gas introduction portion 32 with a distance from the lower portion. Further, the second joint portion 46 is formed substantially parallel to the first joint portion 45.

第３の接合部47は、（第３の）非膨張部として形成され、第１及び第２の接合部45，46よりも後方で、かつ、第４の接合部48よりも前方に位置している。本実施の形態において、この第３の接合部47は、エアバッグ10（エアバッグ本体部33）の展開状態で、前席よりも後方で、センターピラー22の後縁部近傍に位置している。すなわち、この第３の接合部47は、エアバッグ10（エアバッグ本体部33）の展開状態で、前席に着座した乗員の頭部よりも後方で、かつ、後席に着座した乗員の頭部よりも前方に位置している。そして、この第３の接合部47は、上下方向に沿って形成されている。具体的に、この第３の接合部47は、エアバッグ本体部33（外縁エアバッグ接合部36）の下縁部のうち、第２の接合部46の後方の位置を基端部として、先端部が後方上側に向けて傾斜するとともに、先端部ほど後方に湾曲する曲線状に形成され、先端部がエアバッグ本体部33（外縁エアバッグ接合部36）の上縁部に対して離間されているとともにエアバッグ本体部33（外縁エアバッグ接合部36）の下縁部に近接して位置している。この第３の接合部47は、第２の接合部46に対して長さが半分未満程度に短く形成されている。 The third joint 47 is formed as a (third) non-expanding portion and is located posterior to the first and second joints 45, 46 and anterior to the fourth joint 48. ing. In the present embodiment, the third joint portion 47 is located behind the front seat and near the trailing edge portion of the center pillar 22 in the deployed state of the airbag 10 (airbag main body portion 33). .. That is, the third joint portion 47 is the head of the occupant seated in the rear seat and behind the head of the occupant seated in the front seat in the deployed state of the airbag 10 (airbag body portion 33). It is located in front of the part. The third joint portion 47 is formed along the vertical direction. Specifically, the tip of the third joint 47 is the lower edge of the airbag main body 33 (outer edge airbag joint 36), with the position behind the second joint 46 as the base end. The portion is inclined toward the rear upper side, and the tip portion is formed in a curved shape that curves rearward, and the tip portion is separated from the upper edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36). It is also located close to the lower edge of the airbag body 33 (outer edge airbag joint 36). The length of the third joint portion 47 is formed to be less than half the length of the second joint portion 46.

第４の接合部48は、（第４の）非膨張部として形成され、第１ないし第３の接合部45〜47よりも後方に位置している。本実施の形態において、この第４の接合部48は、エアバッグ10（エアバッグ本体部33）の展開状態で、前席よりも後方で、かつ、後席に着座した乗員Ａの頭部Ａ1よりも前方に位置し、エアバッグ本体部33の後端部よりも前方に離間されている。そして、この第４の接合部48は、全体として基端側よりも先端側が上方に位置するように湾曲して形成されている。具体的に、この第４の接合部48は、本実施の形態において、エアバッグ本体部33（外縁エアバッグ接合部36）の下縁部を基端部として上側（前方上側）に向かって上下方向に延びる後部接合部48aと、この後部接合部48aの上端部に連続し前方に向かって略水平方向に延びる中間接合部である第１の中間接合部48bと、この第１の中間接合部48bの前端部から上側に向かって上下方向に延びる中央接合部48cと、この中央接合部48cの先端部から前方に向かって略水平方向に延びる中間接合部である第２の中間接合部48dと、この第２の中間接合部48dの前端部から第３の接合部47の先端部の上方に対向する位置に上下方向に沿って延びる先端部（端末部）である前部接合部48eとを備える自由端状に形成され、この前部接合部48eに保護部41aが連続している。したがって、この第４の接合部48は、上下方向（エアバッグ10（エアバッグ本体部33）の展開方向）と交差（直交）し所定面24に沿う前方に向かって上側へと階段状に、すなわち複数の段差状に屈曲するように（基端側から先端側へと徐々に上方に位置するように）複数の屈曲部49を備えて形成されている。換言すれば、この第４の接合部48は、上下方向に向かって延びる部分と所定面24に沿う方向である水平方向に沿って延びる部分とが基端側から先端側に向かって交互に複数ずつ繰り返す折れ線形状となっている。このため、この第４の接合部48は、上方に凸でない部分（下方に凸となる部分（第１の中間接合部48bと中央接合部48cとの間の屈曲部49））を少なくとも一部に含む湾曲状に形成されている。言い換えると、第４の接合部48により上部が区画される後側副室54が凹多角形状となるように形成されている。また、この第４の接合部48は、基端部から最上部となる第２の中間接合部48dまでに少なくとも２以上の湾曲部（屈曲部49）、すなわち第４の接合部48全体として３以上の湾曲部（屈曲部49）を備えている。また、この第４の接合部48は、外縁エアバッグ接合部36に対して下方に離間されて位置している。 The fourth joint 48 is formed as a (fourth) non-expanding portion and is located behind the first to third joints 45-47. In the present embodiment, the fourth joint portion 48 is the head A1 of the occupant A seated in the rear seat and behind the front seat in the deployed state of the airbag 10 (airbag main body portion 33). It is located in front of the airbag and is separated from the rear end of the airbag body 33. The fourth joint portion 48 is formed so as to be curved so that the tip end side is located above the base end side as a whole. Specifically, in the present embodiment, the fourth joint portion 48 moves up and down toward the upper side (front upper side) with the lower edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36) as the base end portion. A rear joint 48a extending in the direction, a first intermediate joint 48b which is an intermediate joint continuous with the upper end of the rear joint 48a and extending substantially horizontally toward the front, and the first intermediate joint A central joint 48c extending upward and downward from the front end of 48b, and a second intermediate joint 48d which is an intermediate joint extending substantially horizontally from the tip of the central joint 48c to the front. , The front joint portion 48e, which is a tip portion (terminal portion) extending in the vertical direction from the front end portion of the second intermediate joint portion 48d to a position facing above the tip portion of the third joint portion 47. It is formed in the shape of a free end, and the protective portion 41a is continuous with the front joint portion 48e. Therefore, the fourth joint portion 48 intersects (orthogonally) the vertical direction (the deployment direction of the airbag 10 (airbag main body portion 33)), and is stepped upward toward the front along the predetermined surface 24. That is, a plurality of bent portions 49 are provided so as to be bent in a plurality of steps (so as to be gradually positioned upward from the proximal end side to the distal end side). In other words, the fourth joint portion 48 has a plurality of portions extending in the vertical direction and portions extending in the horizontal direction along the predetermined surface 24 alternately from the proximal end side to the distal end side. It has a polygonal line shape that repeats one by one. Therefore, the fourth joint portion 48 includes at least a part that is not convex upward (a portion that is convex downward (a bent portion 49 between the first intermediate joint portion 48b and the central joint portion 48c)). It is formed in a curved shape included in. In other words, the rear sub-chamber 54 whose upper part is partitioned by the fourth joint 48 is formed so as to have a concave polygonal shape. Further, the fourth joint portion 48 has at least two or more curved portions (bent portions 49) from the base end portion to the second intermediate joint portion 48d which is the uppermost portion, that is, the fourth joint portion 48 as a whole is 3 It is provided with the above curved portion (bent portion 49). Further, the fourth joint portion 48 is located so as to be separated downward from the outer edge airbag joint portion 36.

そして、上記の接合部41により、膨張部42には、（第１の）気室である前側主室51と、（第２の）気室である後側主室52と、（第１の）副室である前側副室53と、（第２の）副室である後側副室54とがそれぞれ設定されているとともに、ガス流路55が設定されている。 Then, due to the joint portion 41 described above, the expansion portion 42 has the front main chamber 51, which is the (first) air chamber, the rear main chamber 52, which is the (second) air chamber, and the (first) main chamber 52. ) The front sub-chamber 53, which is a sub-chamber, and the rear sub-chamber 54, which is a (second) sub-chamber, are set respectively, and the gas flow path 55 is set.

前側主室51は、エアバッグ10（エアバッグ本体部33）の展開により前席に着座する乗員の頭部を拘束するもので、第１の接合部45により前側が区画され、第２の接合部46により後側が区画され、上下が外縁エアバッグ接合部36により区画されている。また、この前側主室51の前側下部は、前側非膨張部である下部接合部57により区画されている。そして、この前側主室51は、第１の接合部45、第２の接合部46、下部接合部57、及び外縁エアバッグ接合部36により囲まれる拘束面により前席に着座した乗員の頭部を拘束するようになっている。また、この前側主室51は、上部がガス導入部32と直接連通されているとともに、第１の接合部45の下部と下側の外縁エアバッグ接合部36との間に形成される第１の連通口61を介して前側副室53と直接連通され、かつ、第２の接合部46の上部とガス導入部32との間に形成される第２の連通口62を介してガス流路55と直接連通されている。 The front main chamber 51 restrains the head of an occupant seated in the front seat by deploying the airbag 10 (airbag main body 33), and the front side is partitioned by the first joint 45 and the second joint is formed. The rear side is partitioned by the portion 46, and the upper and lower sides are partitioned by the outer edge airbag joint portion 36. Further, the front lower portion of the front main chamber 51 is partitioned by a lower joint portion 57 which is a front non-expanding portion. The front main chamber 51 is the head of an occupant seated in the front seat by a restraint surface surrounded by a first joint 45, a second joint 46, a lower joint 57, and an outer edge airbag joint 36. Is designed to be restrained. Further, the front main chamber 51 has a first upper portion that is directly communicated with the gas introduction portion 32 and is formed between the lower portion of the first joint portion 45 and the lower outer edge airbag joint portion 36. The gas flow path is directly communicated with the front side sub-chamber 53 through the communication port 61 of the above, and is formed between the upper portion of the second joint portion 46 and the gas introduction portion 32. It is directly connected to 55.

第１の連通口61は、上下に狭く絞られて形成され、所定の通気抵抗を発生させ、前側主室51から前側副室53へのガスの急激な流入を抑制するインターナルベントとして機能するものである。すなわち、この第１の連通口61により、前側副室53は、前側主室51及び後側主室52が膨張展開する展開初期には、全くあるいは殆どガスが導入されず、膨張しないように構成されている。 The first communication port 61 is formed by narrowing up and down narrowly, generates a predetermined ventilation resistance, and functions as an internal vent that suppresses a sudden inflow of gas from the front main chamber 51 to the front sub chamber 53. It is a thing. That is, by the first communication port 61, the front sub-chamber 53 is configured so that the front main chamber 51 and the rear main chamber 52 do not expand at all or almost at the initial stage of expansion when the front main chamber 51 and the rear main chamber 52 expand and expand. Has been done.

下部接合部57は、第１の接合部45に対して後方に離間され、かつ、第２の接合部46に対して前方に離間された位置、すなわちこれら第１の接合部45と第２の接合部46との間に配置されている。また、この下部接合部57は、エアバッグ本体部33（外縁エアバッグ接合部36）の下縁部から上方に突出して形成されている。この下部接合部57は、例えば半円形状に形成されている。 The lower joint 57 is separated rearward from the first joint 45 and forward from the second joint 46, that is, the first joint 45 and the second joint 45. It is arranged between the joint 46. Further, the lower joint portion 57 is formed so as to project upward from the lower edge portion of the airbag main body portion 33 (outer edge airbag joint portion 36). The lower joint portion 57 is formed in a semicircular shape, for example.

後側主室52は、エアバッグ10（エアバッグ本体部33）の展開により後席に着座する乗員Ａの頭部Ａ1を拘束するもので、第４の接合部48により前側下部が区画され、外縁エアバッグ接合部36により後側下部、後部及び上部がそれぞれ区画されている。また、この後側主室52は、前側上部がガス流路55と直接連通されている。そして、この後側主室52は、第４の接合部48の後部接合部48a、第１の中間接合部48b、中央接合部48cと外縁エアバッグ接合部36とにより囲まれる拘束面である後側拘束面63により後席に着座した乗員Ａの頭部Ａ1を拘束するようになっている。したがって、この後側拘束面63は、前後方向に長手状で、かつ、上方向に向かって前側へと順次段差状（階段状）に長くなる形状に形成され、後席に着座した乗員Ａの頭部Ａ1の側方に展開される。 The rear main chamber 52 restrains the head A1 of the occupant A seated in the rear seat by deploying the airbag 10 (airbag main body 33), and the lower front portion is partitioned by the fourth joint 48. The outer edge airbag joint 36 separates the rear lower part, the rear part, and the upper part, respectively. Further, in the rear main chamber 52, the upper part on the front side is directly communicated with the gas flow path 55. The rear main chamber 52 is a restraining surface surrounded by the rear joint portion 48a of the fourth joint portion 48, the first intermediate joint portion 48b, the central joint portion 48c, and the outer edge airbag joint portion 36. The side restraint surface 63 restrains the head A1 of the occupant A seated in the rear seat. Therefore, the rear restraint surface 63 is formed in a shape that is longitudinal in the front-rear direction and gradually becomes longer in a stepped shape (step-like) toward the front side in the upward direction, and the occupant A seated in the rear seat. Deployed to the side of the head A1.

前側副室53は、前側主室51での乗員の頭部の拘束に伴う内圧の上昇を、前側主室51に導入されたガスの一部を受け入れることで抑制して前側主室51を安定した一定の圧力に保持するものである。この前側副室53は、外縁エアバッグ接合部36により上部、前部及び下部がそれぞれ区画され、第１の接合部45により後部が区画されている。この前側副室53は、前側主室51よりも容積が小さく形成されている。 The anterior sub-chamber 53 stabilizes the anterior main chamber 51 by suppressing an increase in internal pressure due to restraint of the occupant's head in the anterior main chamber 51 by receiving a part of the gas introduced into the anterior main chamber 51. It is held at a constant pressure. The front sub-chamber 53 is partitioned by an outer edge airbag joint 36 at an upper portion, a front portion and a lower portion, respectively, and a rear portion is partitioned by a first joint portion 45. The volume of the front sub-chamber 53 is smaller than that of the front main chamber 51.

後側副室54は、後側主室52での乗員Ａの頭部Ａ1の拘束に伴う内圧の上昇を、後側主室52に導入されたガスの一部を受け入れることで抑制して後側主室52を安定した一定の圧力に保持するものである。この後側副室54は、第４の接合部48により後部、上部及び前部の上側がそれぞれ区画され、第３の接合部47により前部の下側が区画され、かつ、外縁エアバッグ接合部36により下部が区画されている。この後側副室54は、ガス流路55の下部に区画されている。また、この後側副室54は、第３の接合部47及び第４の接合部48の前部接合部48eの間に形成される通気口である第３の連通口64を介してガス流路55と直接連通されている。したがって、この後側副室54は、第３の連通口64及びガス流路55を介して後側主室52と連通されている。 The rear sub-chamber 54 suppresses the increase in internal pressure due to the restraint of the head A1 of the occupant A in the rear main chamber 52 by receiving a part of the gas introduced into the rear main chamber 52. It holds the side main chamber 52 at a stable and constant pressure. In the rear sub-chamber 54, the rear part, the upper part and the upper part of the front part are partitioned by the fourth joint part 48, the lower part of the front part is partitioned by the third joint part 47, and the outer edge airbag joint part. The lower part is divided by 36. The rear sub chamber 54 is partitioned below the gas flow path 55. Further, the rear sub chamber 54 is a gas flow through a third communication port 64, which is a vent formed between the third joint portion 47 and the front joint portion 48e of the fourth joint portion 48. It communicates directly with Road 55. Therefore, the rear sub chamber 54 communicates with the rear main chamber 52 via the third communication port 64 and the gas flow path 55.

第３の連通口64は、上下に狭く絞られて形成され、所定の通気抵抗を発生させ、後側主室52から後側副室54へのガスの急激な流入を抑制するインターナルベントとして機能するものである。すなわち、この第３の連通口64により、後側副室54は、前側主室51及び後側主室52が膨張展開する展開初期には、全くあるいは殆どガスが導入されず、膨張しないように構成されている。 The third communication port 64 is formed by narrowing up and down narrowly to generate a predetermined ventilation resistance, and as an internal vent that suppresses a rapid inflow of gas from the rear main chamber 52 to the rear sub chamber 54. It works. That is, due to the third communication port 64, the rear sub chamber 54 is prevented from expanding at all or almost no gas at the initial stage of expansion when the front main chamber 51 and the rear main chamber 52 expand and expand. It is configured.

ガス流路55は、インフレータ27からガス導入部32を介して導入されたガスを後側主室52へと導入するもので、後側が第４の接合部48の第２の中間接合部48dの上部に沿って前後方向に、すなわちエアバッグ本体部33の後部の上縁部に沿って形成され、前側が第２の接合部46と第３の接合部47及び第４の接合部48の前部接合部48eとの間に上下方向に沿って形成されている。 The gas flow path 55 introduces the gas introduced from the inflator 27 through the gas introduction portion 32 into the rear main chamber 52, and the rear side is the second intermediate joint portion 48d of the fourth joint portion 48. It is formed along the upper part in the front-rear direction, that is, along the upper edge of the rear part of the airbag body 33, and the front side is in front of the second joint 46, the third joint 47, and the fourth joint 48. It is formed along the vertical direction between it and the joint portion 48e.

そして、エアバッグ10を製造する際には、基布を外縁エアバッグ接合部36、第１ないし第４の接合部45〜48、及び、下部接合部57によりそれぞれ縫製などで接合することで、主室51，52及び副室53，54を備えるエアバッグ本体部33とガス導入部32とを有するエアバッグ10が完成する。この状態で、ガス導入部32の挿入開口38にインフレータ27のガス噴射側を挿入し、このインフレータ27をエアバッグ10から外側に露出させた状態として一体的に固定する。 Then, when the airbag 10 is manufactured, the base cloth is joined by sewing or the like by the outer edge airbag joint 36, the first to fourth airbag joints 45 to 48, and the lower joint 57, respectively. The airbag 10 having the airbag main body 33 having the main chambers 51 and 52 and the sub chambers 53 and 54 and the gas introduction portion 32 is completed. In this state, the gas injection side of the inflator 27 is inserted into the insertion opening 38 of the gas introduction portion 32, and the inflator 27 is integrally fixed as being exposed to the outside from the airbag 10.

さらに、エアバッグ本体部33をロール状などに折り曲げながら巻き上げて、エアバッグ10を所定の細長い形状に折り畳みと、図示しないスリーブなどを用いてエアバッグ10の展開時の圧力で結合解除すなわち破断可能となるように折り畳み形状を保持する。このようにして、エアバッグ10が細長く折り畳まれ、かつ、折畳形状が保持された状態となり、カーテンエアバッグモジュールとなるエアバッグ装置11が構成される。 Further, the airbag main body 33 is rolled up while being bent into a roll shape or the like, the airbag 10 is folded into a predetermined elongated shape, and the airbag 10 can be uncoupled or broken by the pressure at the time of deployment using a sleeve (not shown) or the like. Hold the folded shape so that In this way, the airbag 10 is elongated and folded, and the folded shape is maintained, so that the airbag device 11 serving as the curtain airbag module is configured.

そして、上記のように折り畳まれたエアバッグ10を備えるエアバッグ装置11を車室14内に持ち込み、ヘッドライニング及びピラーガーニッシュなどの内装材が取り付けられる前に車体への取付作業を行う。この取付作業は、エアバッグ10の複数の取付部34及びテザーベルト29を図示しないボルトなどの固定具により車体に取り付け固定することにより行われる。また、インフレータ27は、センターピラー22の上方に相当する位置に固定される。さらに、インフレータ27から導出されたハーネスを車体に備えた制御装置に接続する。次いで、車体の天井パネルにヘッドライニングを取り付けてエアバッグ装置11を覆うとともに、各ピラー21，22，23にピラーガーニッシュをそれぞれ取り付けて、エアバッグ装置11の車体への取付作業が完了する。この取付状態で、エアバッグ装置11がヘッドライニング及びピラーガーニッシュによって車室14内と隔離されるとともに、ガス導入部32に挿入されたインフレータ27と、ロール状に折り畳まれたエアバッグ本体部33とが、ピラーガーニッシュの上方の位置に保持される。 Then, the airbag device 11 including the airbag 10 folded as described above is brought into the passenger compartment 14 and attached to the vehicle body before the interior materials such as the head lining and the pillar garnish are attached. This mounting work is performed by mounting and fixing the plurality of mounting portions 34 and the tether belt 29 of the airbag 10 to the vehicle body with fixtures such as bolts (not shown). Further, the inflator 27 is fixed at a position corresponding to the upper part of the center pillar 22. Further, the harness derived from the inflator 27 is connected to the control device provided on the vehicle body. Next, a head lining is attached to the ceiling panel of the vehicle body to cover the airbag device 11, and pillar garnishes are attached to the pillars 21, 22, and 23, respectively, to complete the installation work of the airbag device 11 to the vehicle body. In this mounted state, the airbag device 11 is isolated from the inside of the passenger compartment 14 by the head lining and the pillar garnish, and the inflator 27 inserted into the gas introduction portion 32 and the airbag main body 33 folded into a roll shape. Is held above the pillar garnish.

そして、車両の斜め衝突（斜め前方からの衝突）を含む側面衝突あるいは横転などの際には、制御装置によりインフレータ27が作動し、このインフレータ27から噴射されるガスがガス導入部32を膨張させた後、エアバッグ本体部33内へと導入されて、エアバッグ本体部33が車室14の側部の所定面24に沿って下方へと面状に膨張展開して乗員を保護する。 Then, in the event of a side collision or rollover including a diagonal collision of the vehicle (collision from diagonally forward), the controller operates the inflator 27, and the gas injected from the inflator 27 expands the gas introduction unit 32. After that, it is introduced into the airbag main body 33, and the airbag main body 33 expands and expands downward along a predetermined surface 24 on the side of the passenger compartment 14 to protect the occupants.

より詳細には、エアバッグ10にガス導入部32にてガスが供給されると、このガス導入部32から導入されたガスが前側主室51及びガス流路55から後側主室52へと前後に分岐されて供給される。このため、エアバッグ本体部33は、前側主室51、ガス流路55及び後側主室52が膨張しながら展開してヘッドライニングの下端部を車室14の室内側へと押しのけるように変形させ、ピラーガーニッシュの上端部から車室14内へと突出し、所定面24に沿って下方へと展開する。前側副室53には、前側主室51を介して第１の連通口61からガスが供給され、後側副室54には、ガス流路55を介して第３の連通口64からガスが供給され、これら前側副室53及び後側副室54も膨張しながら展開する。 More specifically, when gas is supplied to the airbag 10 by the gas introduction section 32, the gas introduced from the gas introduction section 32 moves from the front main chamber 51 and the gas flow path 55 to the rear main chamber 52. It is branched back and forth and supplied. Therefore, the airbag main body 33 is deformed so that the front main chamber 51, the gas flow path 55, and the rear main chamber 52 expand while expanding, and the lower end of the head lining is pushed away to the interior side of the passenger compartment 14. Then, it projects from the upper end of the pillar garnish into the passenger compartment 14, and expands downward along the predetermined surface 24. Gas is supplied to the front sub chamber 53 from the first communication port 61 via the front main chamber 51, and gas is supplied to the rear sub chamber 54 from the third communication port 64 via the gas flow path 55. It is supplied, and these front side sub-chamber 53 and rear side sub-chamber 54 also expand while expanding.

前側主室51は、第１の接合部45、第２の接合部46、下部接合部57、及び外縁エアバッグ接合部36により前席に着座した乗員の頭部の側方（乗員の頭部と車体との間）に前側拘束面を形成し、斜め衝突によって斜め前方へと投げ出されて移動してくる乗員の頭部を前側拘束面で拘束する。なお、この前側主室51は、乗員の頭部の拘束により幅方向に押圧されることでガスの一部が第１の連通口61を介して前側副室53へと徐々に流入し、適切な内圧を保持する。 The front main chamber 51 is lateral to the head of the occupant seated in the front seat by the first joint 45, the second joint 46, the lower joint 57, and the outer edge airbag joint 36 (occupant's head). A front restraint surface is formed between the vehicle and the vehicle body), and the head of the occupant who is thrown diagonally forward due to an oblique collision is restrained by the front restraint surface. The front main chamber 51 is pressed in the width direction by the restraint of the occupant's head, so that a part of the gas gradually flows into the front sub chamber 53 through the first communication port 61, which is appropriate. Maintains internal pressure.

また、後側主室52では、後席に着座した乗員Ａの頭部Ａ1の側方（乗員Ａの頭部Ａ1と車体との間）に後側拘束面63を形成し、斜め衝突によって斜め前方へと投げ出されて移動してくる乗員Ａの頭部Ａ1を後側拘束面63で拘束する。 Further, in the rear main room 52, a rear restraint surface 63 is formed on the side of the head A1 of the occupant A seated in the rear seat (between the head A1 of the occupant A and the vehicle body), and diagonally due to an oblique collision. The head A1 of the occupant A who is thrown forward and moves is restrained by the rear restraint surface 63.

このとき、後側拘束面63は、階段状の第４の接合部48により後側主室52が区画されていることで、前部63aが乗員Ａの頭部Ａ1の側部前端近傍まで前後方向に沿って平坦状に延びて乗員Ａの頭部Ａ1の側部と後側拘束面63との隙間が抑制されるとともに、頭部Ａ1の前方まで略平坦状となる。 At this time, the rear restraint surface 63 has the rear main chamber 52 partitioned by the stepped fourth joint 48, so that the front 63a is moved back and forth to the vicinity of the side front end of the head A1 of the occupant A. It extends flatly along the direction to suppress the gap between the side portion of the head A1 of the occupant A and the rear restraint surface 63, and becomes substantially flat to the front of the head A1.

具体的に、一の比較例として第４の接合部48p1が頭部Ａ1の側部の位置で逆Ｌ字状に屈曲するエアバッグ10p1を示す図２（ｂ1）及び図２（ｂ2）の場合には、後側主室52p1が頭部Ａ1の側部付近までしか位置せず、後側拘束面63p1が頭部Ａ1に対して前後に短く、頭部Ａ1の側部前側に位置しないことで後側拘束面63p1に拘束される頭部Ａ1が前方に滑りやすくなって頭部Ａ1が回転しやすいのに対して、図２（ａ1）及び図２（ａ2）に示す本実施の形態の場合には、第４の接合部48の中央接合部48cが後部接合部48aよりも前方に位置するので後側主室52が頭部Ａ1の側部前側まで展開して後側拘束面63の前部63aがより前方まで延び、頭部Ａ1との隙間を抑制している。さらに、他の比較例として第４の接合部48p2が頭部Ａ1の側部前側に位置で逆Ｌ字状に屈曲するエアバッグ10p2を示す図２（ｃ1）及び図２（ｃ2）の場合には、頭部Ａ1の側部前側の位置で後側主室52p2が乗員Ａ側に過剰に膨張して左右幅（ストローク）が大きくなり、後側拘束面63p2が傾斜してこの後側拘束面63p2に拘束される頭部Ａ1の前部が反エアバッグ10側に、頭部Ａ1の後部がエアバッグ10側に回転されるような、上下軸方向の回転をしやすいとともに後側主室52p2の容量が大きくなりインフレータ27の出力を拡大する必要があるのに対して、図２（ａ1）及び図２（ａ2）に示す本実施の形態の場合には、第４の接合部48が階段状であるために後部接合部48a及び第１の中間接合部48bによって頭部Ａ1の側部前側の位置での後側主室52の幅を規制することで、前部63aがより前方まで平坦状となって後席に着座した乗員Ａの頭部Ａ1の側部前側を後側主室52によって積極的に抑えないようになっているとともに、後側主室52の容量が必要以上に大きくならず、インフレータ27の出力の拡大の必要がない。 Specifically, as a comparative example, the case of FIGS. 2 (b1) and 2 (b2) showing an airbag 10p1 in which the fourth joint portion 48p1 bends in an inverted L shape at the position of the side portion of the head A1. The rear main chamber 52p1 is located only near the side of the head A1, the rear restraint surface 63p1 is shorter in the front-rear direction with respect to the head A1, and is not located in the front side of the head A1. In the case of the present embodiment shown in FIGS. 2 (a1) and 2 (a2), the head A1 constrained by the rear restraint surface 63p1 slips forward and the head A1 easily rotates. Since the central joint 48c of the fourth joint 48 is located in front of the rear joint 48a, the rear main chamber 52 expands to the front side of the head A1 and is in front of the rear restraint surface 63. The portion 63a extends further forward to suppress the gap with the head A1. Further, as another comparative example, in the case of FIGS. 2 (c1) and 2 (c2) showing the airbag 10p2 in which the fourth joint portion 48p2 bends in an inverted L shape at the position on the side front side of the head A1. At the position on the front side of the side of the head A1, the rear main chamber 52p2 expands excessively toward the occupant A side and the left-right width (stroke) increases, and the rear restraint surface 63p2 tilts to this rear restraint surface. The front part of the head A1 restrained by 63p2 is rotated toward the anti-airbag 10 side, and the rear part of the head A1 is rotated toward the airbag 10 side, so that it is easy to rotate in the vertical axis direction and the rear main chamber 52p2. In the case of the present embodiment shown in FIGS. 2 (a1) and 2 (a2), the fourth joint 48 is a staircase, whereas the capacity of the inflator 27 needs to be increased to increase the output of the inflator 27. Due to the shape, the rear joint 48a and the first intermediate joint 48b regulate the width of the rear main chamber 52 at the side front position of the head A1 so that the front 63a is flattened further forward. The front side of the head A1 of the occupant A seated in the rear seat is not positively suppressed by the rear main chamber 52, and the capacity of the rear main chamber 52 is larger than necessary. There is no need to increase the output of the inflator 27.

この結果、後側拘束面63の平坦状の部分（保護領域）が前後に広く延び、斜め衝突によって斜め前方へと投げ出されて移動してくる乗員Ａの頭部Ａ1全体を後側主室52（後側拘束面63）によって拘束し、かつ、頭部Ａ1が前方向に滑りにくくなり、頭部Ａ1の前部が反エアバッグ10側に、頭部Ａ1の後部がエアバッグ10側に回転されるような、上下軸方向の回転が抑制される。 As a result, the flat portion (protection area) of the rear restraint surface 63 extends widely in the front-rear direction, and the entire head A1 of the occupant A who is thrown diagonally forward due to an oblique collision and moves is covered by the rear main chamber 52. (Rear restraint surface 63) restrains and makes the head A1 less slippery in the forward direction, the front part of the head A1 rotates to the anti-airbag 10 side, and the rear part of the head A1 rotates to the airbag 10 side. The rotation in the vertical axis direction is suppressed.

しかも、上記エアバッグ10p1では、図３（ｂ1）、図３（ｂ2）及び図３（ｂ3）に断面を示すように、第４の接合部48p1によって後側副室54p1及びガス流路55p1の断面形状が略一定となることで後側副室54p1の前端部及び後端部にて折れ曲がりの起点Ｐが上下方向に重なって直線状に生じやすく、車体側のピラー22，23を支点として折れ曲がりが生じやすいのに対して、図３（ａ1）、図３（ａ2）及び図３（ａ3）に示す本実施の形態のエアバッグ10の場合には、第４の接合部48が階段状であるため後側主室52、後側副室54及びガス流路55の断面形状が一定とならず、折れ曲がりの起点を前後に分散でき、車体側のピラー22，23を支点としても特定の起点からの折れ曲がりを抑制できる。この結果、エアバッグ10の形状が変わりにくく、頭部Ａ1を狙い通りに拘束でき、乗員の車外放出を効果的に防止する。 Moreover, in the airbag 10p1, as shown in the cross sections of FIGS. 3 (b1), 3 (b2) and 3 (b3), the rear sub chamber 54p1 and the gas flow path 55p1 are connected by the fourth joint 48p1. Since the cross-sectional shape is substantially constant, the starting point P of the bend at the front end and the rear end of the rear auxiliary chamber 54p1 tends to overlap in the vertical direction and occur linearly, and the bend is likely to occur with the pillars 22 and 23 on the vehicle body as fulcrums. However, in the case of the airbag 10 of the present embodiment shown in FIGS. 3 (a1), 3 (a2) and 3 (a3), the fourth joint portion 48 has a stepped shape. Therefore, the cross-sectional shapes of the rear main chamber 52, the rear sub chamber 54, and the gas flow path 55 are not constant, the starting point of bending can be dispersed back and forth, and a specific starting point can be obtained even if the pillars 22 and 23 on the vehicle body side are used as fulcrums. Bending from the can be suppressed. As a result, the shape of the airbag 10 does not change easily, the head A1 can be restrained as intended, and the occupant is effectively prevented from being released from the vehicle.

さらに、後側主室52は、さらに他の比較例としてテザーなどを用いてエアバッグ10p3の後側主室52p3を所定幅に規制する図４（ｂ）と比較して、図４（ａ）に示す本実施の形態の場合には、階段形状とした第４の接合部48によって左右幅を充分に保ち、ドアトリムＴよりも左右幅を大きく取ることができるので、ドアトリムＴによる乗員Ａの身体の拘束のタイミングに対してエアバッグ10による頭部Ａ1の拘束のタイミングまでの時間差が生じにくく、前後軸方向の回転が抑制される。なお、この後側主室52は、乗員Ａの頭部Ａ1の拘束により幅方向に押圧されることでガスの一部が第３の連通口64を介して後側副室54へと徐々に流入し、適切な内圧を保持する。 Further, the rear main chamber 52 is compared with FIG. 4 (a) in which the rear main chamber 52p3 of the airbag 10p3 is regulated to a predetermined width by using a tether or the like as another comparative example. In the case of the present embodiment shown in the above, the left and right width can be sufficiently maintained by the fourth joint portion 48 having a staircase shape, and the left and right width can be made larger than the door trim T. Therefore, the body of the occupant A by the door trim T The time difference between the timing of restraint of the head A1 and the timing of restraint of the head A1 by the airbag 10 is unlikely to occur, and the rotation in the front-rear axial direction is suppressed. The rear main chamber 52 is pressed in the width direction by the restraint of the head A1 of the occupant A, so that a part of the gas gradually moves to the rear sub chamber 54 through the third communication port 64. Inflow and maintain proper internal pressure.

このように、基端側よりも先端側が上方に位置し、かつ上方に凸でない部分を少なくとも一部に含むように湾曲させた第４の接合部48により後側主室53の下部を区画することで、例えば他の基布などの部材や製造のための特殊な設備などを用いたり、インフレータ27の出力を変えたりすることなく、後席に着座した乗員Ａの頭部Ａ1の側部前側から側部後側に亘って後側主室52（後側拘束面63）によって略均一に拘束できて頭部Ａ1の上下軸方向の回転を抑制でき、安価な構成で乗員Ａの頭部Ａ1をより効果的に拘束できる。 In this way, the lower part of the rear main chamber 53 is partitioned by the fourth joint 48 which is curved so that the tip side is located above the base end side and includes at least a part which is not convex upward. Therefore, for example, the front side of the head A1 of the occupant A seated in the rear seat without using other members such as a base cloth or special equipment for manufacturing or changing the output of the inflator 27. The rear main chamber 52 (rear restraint surface 63) can be restrained substantially uniformly from the side to the rear side, and the rotation of the head A1 in the vertical axis direction can be suppressed, and the head A1 of the occupant A can be suppressed with an inexpensive configuration. Can be restrained more effectively.

また、第４の接合部48を基端側から先端側へと階段状に形成することで、基端側よりも先端側が上方に位置し、かつ上方に凸でない部分を少なくとも一部に含むように湾曲する第４の接合部48を容易に構成できる。 Further, by forming the fourth joint portion 48 in a stepped manner from the proximal end side to the distal end side, the distal end side is located above the proximal end side and at least a part that is not convex upward is included. A fourth joint 48 that is curved to can be easily constructed.

すなわち、後側主室52は、第４の接合部48の配置及び形状のみによって、乗員Ａの頭部Ａ1を拘束する後側拘束面63が前後方向へとより広く平坦状に延ばすことができ、かつ、幅を充分に確保できることで、安価な構成で乗員Ａの頭部Ａ1の回転を抑制でき、回転に起因する乗員Ａの脳の傷害値をより抑制できる。 That is, in the rear main chamber 52, the rear restraint surface 63 that restrains the head A1 of the occupant A can be extended more widely and flatly in the front-rear direction only by the arrangement and shape of the fourth joint portion 48. Moreover, since the width can be sufficiently secured, the rotation of the head A1 of the occupant A can be suppressed with an inexpensive configuration, and the injury value of the brain of the occupant A due to the rotation can be further suppressed.

また、エアバッグ本体部33に第４の接合部48によって上部を区画する後側副室54を設け、この後側副室54と後側主室52とを連通する第３の連通口64が、後側主室52から後側副室54へと流入するガスを規制して通気抵抗を生じさせるので、ガスが後側副室54へと徐々に流入し、後側主室52を適切な内圧に保持できる。 Further, the airbag main body 33 is provided with a rear sub-chamber 54 whose upper portion is partitioned by a fourth joint 48, and a third communication port 64 for communicating the rear sub-chamber 54 and the rear main chamber 52 is provided. , The gas flowing from the rear main chamber 52 to the rear sub chamber 54 is regulated to generate ventilation resistance, so that the gas gradually flows into the rear sub chamber 54 and the rear main chamber 52 is appropriately used. Can be held at internal pressure.

なお、上記の第１の実施の形態において、第４の接合部48は、基端側よりも先端側が上方に位置し、かつ上方に凸でない部分（下方に凸となる湾曲状（凸関数状）の部分または直線状の部分）を少なくとも一部に含むように湾曲されていれば、他の形状とすることができる。例えば図６に示す第２の実施の形態のように、第４の接合部48の第１の中間接合部48bを前側に向かって上方へと傾斜する直線状に形成するとともに中央接合部48cをこの第１の中間接合部48bに対してさらに前側に向かって上方に傾斜する直線状に形成してもよいし、図７に示す第３の実施の形態のように、第４の接合部48の中央接合部48cを前側に向かって上方へと傾斜する直線状に形成してもよい。さらに、例えば図８に示す第４の実施の形態のように、第４の接合部48は、屈曲部49をさらに増加させてもよい。具体的に、この第４の実施の形態では、例えば第４の接合部48の中央接合部48cを前側に向かって上方に傾斜する直線状に形成するとともに、第２の中間接合部48dと前部接合部48eとの間に、第２の中間接合部48dの先端部から前側に向かって上方に傾斜する直線状の連続接合部48f及びこの連続接合部48fの先端部から前方に向かって略水平方向に延びる中間接合部である第３の中間接合部48gを形成している。 In the first embodiment described above, the fourth joint portion 48 has a curved shape (convex function shape) in which the tip side is located above the proximal end side and is not convex upward (convex downward). ) Part or a linear part) can be formed into another shape as long as it is curved so as to include at least a part. For example, as in the second embodiment shown in FIG. 6, the first intermediate joint 48b of the fourth joint 48 is formed in a straight line that is inclined upward toward the front side, and the central joint 48c is formed. The first intermediate joint 48b may be formed in a straight line that is further inclined upward toward the front side, or the fourth joint 48 may be formed as in the third embodiment shown in FIG. The central joint 48c of the above may be formed in a straight line that inclines upward toward the front side. Further, for example, as in the fourth embodiment shown in FIG. 8, the fourth joint portion 48 may further increase the bending portion 49. Specifically, in this fourth embodiment, for example, the central joint 48c of the fourth joint 48 is formed in a straight line that inclines upward toward the front side, and the second intermediate joint 48d and the front are formed. A linear continuous joint 48f that inclines upward from the tip of the second intermediate joint 48d to the joint 48e and the tip of the continuous joint 48f, which is approximately forward. A third intermediate joint 48 g, which is an intermediate joint extending in the horizontal direction, is formed.

また、屈曲部49は、それぞれ直角ないし鈍角状の曲げ角度としたが、より滑らかに湾曲するように形成してもよい。すなわち、第４の接合部48は、折れ線状だけでなく、滑らかな曲線状に形成することもできる。換言すれば、上記の各実施の形態の第４の接合部48の屈曲部49は、それぞれ曲線状に湾曲させることもできる。 Further, although the bent portions 49 are bent at right angles or obtuse angles, they may be formed so as to be curved more smoothly. That is, the fourth joint portion 48 can be formed not only in a polygonal line shape but also in a smooth curved shape. In other words, the bent portion 49 of the fourth joint portion 48 of each of the above embodiments can be curved in a curved shape.

さらに、第４の接合部48は、後側主室52と後側副室54とを区画するものとしたが、例えばエアバッグ10のエアバッグ本体部33の前側主室51に設けることもできる。換言すれば、第４の接合部48を、前側主室51を区画する非膨張部とすることにより、前席に着座した乗員の頭部を保護する構成とすることもできる。 Further, the fourth joint portion 48 is intended to partition the rear side main chamber 52 and the rear side sub chamber 54, but may be provided in the front side main chamber 51 of the airbag main body 33 of the airbag 10, for example. .. In other words, by making the fourth joint portion 48 a non-expandable portion that partitions the front main chamber 51, it is possible to protect the head of the occupant seated in the front seat.

また、上記の各実施の形態において、エアバッグ10は、ルーフサイド部から所定面24に沿って下方に向けて展開するカーテンエアバッグとしたが、例えばドアの上部から上方に向けて展開する、いわゆるドアマウントエアバッグなどとしても用いることができる。 Further, in each of the above embodiments, the airbag 10 is a curtain airbag that expands downward along a predetermined surface 24 from the roof side portion, but for example, it expands upward from the upper part of the door. It can also be used as a so-called door mount airbag.

本発明は、例えば自動車の側部の窓部に沿って取り付けられ展開することで乗員を保護するエアバッグ及びエアバッグ装置に適用できる。 The present invention can be applied, for example, to airbags and airbag devices that protect occupants by being mounted and deployed along a side window of an automobile.

10 エアバッグ
24 所定面
33 エアバッグ本体部
36 外縁エアバッグ接合部
48 非膨張部としての第４の接合部
52 気室である後側主室
54 副室である後側副室
64 通気口である第３の連通口
Ａ乗員
Ａ1 頭部 10 airbags
24 Predetermined surface
33 Airbag body
36 Outer edge airbag joint
48 Fourth joint as a non-expanding part
52 Rear main room, which is the air chamber
54 Sub-chamber, rear sub-chamber
64 Ventilation port 3rd communication port A Crew A1 Head

Claims

An airbag that is formed in a bag shape, is supplied with gas from a folded state, and has an airbag body that expands along a predetermined side surface of a seat in the vehicle interior and expands in the vehicle width direction. ,
The airbag body is
The outer edge airbag joint that joins the outer edge and
A non-expanding portion whose tip side is located forward and above the proximal end side extending upward from the lower part of the outer edge airbag joint and is curved so as to include at least a part which is not convex upward.
The non-inflated portion and the outer edge airbag joint are provided with an air chamber whose lower portion is partitioned and restrains the head of an occupant seated in the seat .
The airbag is characterized in that the air chamber is formed so as to gradually become smaller from the rear to the front .

The airbag according to claim 1, wherein the non-expanding portion is formed in a stepped shape from the proximal end side to the distal end side.

The main body of the airbag is
A sub-chamber whose upper part is partitioned by a non-expandable part,
Claim 1 is provided with a vent that communicates with the air chamber and allows gas flowing from the air chamber to the sub chamber to pass through and regulates this gas to generate ventilation resistance. Or the airbag described in 2.