JP3917907B2

JP3917907B2 - Passenger airbag

Info

Publication number: JP3917907B2
Application number: JP2002189597A
Authority: JP
Inventors: 克巳石川; 仁淳佐野; 正美殿岡; 康洋内田
Original assignee: Nihon Plast Co Ltd
Current assignee: Nihon Plast Co Ltd
Priority date: 2002-06-28
Filing date: 2002-06-28
Publication date: 2007-05-23
Anticipated expiration: 2022-06-28
Also published as: JP2004026114A

Description

【０００１】
【発明の属する技術分野】
この発明は、助手席用エアバッグに関するものである。
【０００２】
【従来の技術】
自動車の助手席側のエアバッグ装置は、車室内前方のインストルメントパネルに、エアバッグを折りたたみ状態で収納した構造になっている。エアバッグは、上側基布と下側基布とを縫製した袋状で、衝突時にインフレータから噴出されたガスにより膨張し、インストルメントパネルの上部から車室内側へ向けて展開し、前倒れしてくる乗員を受け止めて保護するようになっている（類似技術として、特開２００２−１７２９９２号公報参照）。
【０００３】
この種のエアバッグの内部には、エアバッグの前側に形成されたガス導入口付近から、後側に形成された乗員を受け止めるための後面部にかけて、前後方向に延びるテザーベルトが設けられている。このテザーベルトにより、エアバッグの後面部の中央部分を前側に引っ張り、該後面部を乗員に対して平坦に近い面（緩やかな凸、緩やかな凹も含む）にしている。後面を平坦に近い面にすることにより、乗員を広い面積で受け止めることができ、乗員の保護性能が高まる。
【０００４】
【発明が解決しようとする課題】
しかしながら、このような従来の技術にあっては、乗員を受け止めるエアバッグの後面部を平坦に近い面にするために、エアバッグの内部にテザーベルトを設ける必要があり、部品点数及び製造作業工数の増加を招いていた。
【０００５】
この発明は、このような従来の技術に着目してなされたものであり、テザーベルトを用いずに後面部を平坦に近い面にすることができる助手席用エアバッグを提供するものである。
【０００６】
【課題を解決するための手段】
請求項１に記載の発明は、上面部の左右両縁に略三角形状の側面上半部を一体的に形成し且つ上面部の後端に後面部を一体的に形成した上側基布と、下面部の左右両縁に略三角形状の側面下半部を一体的に形成した下側基布とを、縫製により袋状にした助手席用エアバッグであって、前記側面上半部及び側面下半部のそれぞれにおいて、各縁部の交点を直線で結んで三角形を形成した場合に、上面部又は下面部との境界線でない二辺から成る二つの角部の角度の和が、１８０度以上であり、前記後面部の上下中央に相当する中間線が、立体化されたエアバッグにおける後面部の上端及び後端よりも前側に位置し、後面部は側面から見て「くの字状」に凹んだ状態となると共にエアバッグ展開時に後面部が平坦に近い面になることを特徴とする。
【０００７】
請求項１に記載の発明によれば、後面部を上側基布側に有するエアバッグが膨脹した状態において、上側基布及び下側基布の角部が縫製される後面部の中間部分が、前後方向において、立体化されたエアバッグにおける後面部の上端又は下端と同じ位置か、それより前側に位置するため、後面部は平坦或いは凹んだ状態となる（膨脹しても平坦に近い面になる）。また、上下方向において、後面部の中間部分を挟んでオフセットできるため、自動車の車室内の形状に合った後面部とすることができ、後端部は平坦或いは凹んだ状態となる。従って、乗員を広い面積で受け止めることができ、乗員の保護性能が向上する。
【０００８】
請求項２に記載の発明は、上面部の左右両縁に略三角形状の側面上半部を一体的に形成した上側基布と、下面部の左右両縁に略三角形状の側面下半部を一体的に形成し且つ下面部の後端に後面部を一体的に形成した下側基布とを、縫製により袋状にした助手席用エアバッグであって、前記側面上半部及び側面下半部のそれぞれにおいて、各縁部の交点を直線で結んで三角形を形成した場合に、上面部又は下面部との境界線でない二辺から成る二つの角部の角度の和が、１８０度以上であり、前記後面部の上下中央に相当する中間線が、立体化されたエアバッグにおける後面部の上端及び後端よりも前側に位置し、後面部は側面から見て「くの字状」に凹んだ状態となると共にエアバッグ展開時に後面部が平坦に近い面になることを特徴とする。
【０００９】
請求項２に記載の発明によれば、後面部を下側基布側に設けたエアバッグであっても、前項と同様の効果が得られる。
【００１０】
請求項３に記載の発明は、上面部の左右両縁に略三角形状の側面上半部を一体的に形成し且つ上面部の後端に後面部の半分を一体的に形成した上側基布と、下面部の左右両縁に略三角形状の側面下半部を一体的に形成し且つ下面部の後端に後面部の半分を一体的に形成した下側基布とを、縫製により袋状にした助手席用エアバッグであって、前記側面上半部及び側面下半部のそれぞれにおいて、各縁部の交点を直線で結んで三角形を形成した場合に、上面部又は下面部との境界線でない二辺から成る二つの角部の角度の和が、１８０度以上であり、前記後面部の上下中央に相当する中間線が、立体化されたエアバッグにおける後面部の上端及び後端よりも前側に位置し、後面部は側面から見て「くの字状」に凹んだ状態となると共にエアバッグ展開時に後面部が平坦に近い面になることを特徴とする。
【００１１】
請求項３に記載の発明によれば、後面部を上側基布と下側基布に半分づつ設けたエアバッグであっても、前項と同様の効果が得られる。
【００１２】
請求項４に記載の発明は、上面部又は下面部との境界線でない二辺から成る角部が、直角又は鈍角であることを特徴とする。
【００１３】
請求項４に記載の発明によれば、エアバッグが膨張した状態において、上側基布及び下側基布の角部の縫製される位置が後面部の中間部分になるので、乗員を広い面積で受け止めることができ、乗員の保護性能が更に向上する。
【００１４】
請求項５に記載の発明は、三角形における角部を規定する二辺のうち、少なくともいずれか一方に沿う側面上半部及び側面下半部の縁部が、該三角形の外側まで延長された長さに設定され、且つ延長された縁部に縫製される後面部の側縁が同様の長さに設定されていることを特徴とする。
【００１５】
請求項５に記載の発明によれば、３本以上の縫製部が集合する個所において、該個所に関連する３本以上の縫製部のうち、少なくとも１本の縫製部に長さ的な余裕をもたせたため、エアバッグの膨脹時における応力集中が緩和され、特別な補強を施さなくても、その個所からの破断が防止される。
【００１６】
【発明の実施の形態】
以下、この発明の好適な実施形態を図面に基づいて説明する。尚、本明細書において、「前側」とは車両に装備された状態での車両前方に相当する方向で、「後側」とはその逆である。更に、以下に示す各実施形態において、共通する部分には同一の符号を付し、重複する説明は省略する。
【００１７】
図１〜図３は、この発明の第１実施形態を示す図である。この実施形態のエアバッグ１は、ノンコートで目付２００ｇ／ｍ^２のナイロン６６織布からなる２枚の上側基布２と下側基布３とから構成されている。
【００１８】
図１は、上側基布２と下側基布３のそれぞれを展開状態で示した図である。上側基布２は、長方形をした上面部４の左右両縁に、略三角形状の側面上半部５が一体的に形成されている。側面上半部５は、上面部４との境界でない下縁５ａと後縁５ｂのうち、下縁５ａは直線状だが、後縁５ｂは湾曲している。
【００１９】
上面部４の後端には、タル型の後面部６が一体的に形成されている。この後面部６は中間線Ｓを介して前後対象形状で、後面部６の側縁６ａの前半分の長さが、前記側面上半部５の後縁５ｂの長さに相当する。
【００２０】
下側基布３は、長方形をした下面部７の左右両縁に、略三角形状の側面下半部８を一体的形成した形状で、前記上側基布２から後面部６を取り除いた形状と同じである。下面部７の前方には、図示せぬインフレータに固定され、該インフレータからのガスを導入するガス導入口９が形成されている。側面下半部８の上縁８ａは直線状で、後縁８ｂは湾曲している。この側面下半部８の後縁８ｂの長さは、後面部６の側縁６ａの後半分の長さに相当している。
【００２１】
上側基布２の側面上半部５において、各縁部の交点を直線で結んで三角形Ｔを形成した場合に、上面部４との境界線でない二辺、すなわち下縁５ａと、後縁５ｂの補助直線Ｌとから形成される角部Ｃが鈍角θである。また、下側基布３も同様に、側面下半部８において、各縁部の交点を直線で結んで三角形Ｔを形成した場合に、下面部７との境界線でない二辺、すなわち上縁８ａと、後縁８ｂの補助直線Ｌとから形成される角部Ｃが鈍角θである。換言すると、二つの角部Ｃの角度θの和が１８０度以上である。
【００２２】
このような形状に裁断された上側基布２と下側基布３から、立体的な袋状のエアバッグ１を形成するには、最初に上側基布２と下側基布３とを、それぞれ裏返しにした状態で、上側基布２の側面上半部５における後縁５ｂと、後面部６の側縁６ａの前半分を縫製する。次に、上面部４と下面部７の前端同士、側面上半部５と側面下半部８の下縁５ａと上縁８ａ、側面下半部８の後縁８ｂと後面部６の側縁６ａの後半分、後面部６と下面部７の後端同士を縫製して袋状にする。そして、最後に全体をガス導入口９から裏返して、縫製された端部をエアバッグ１の内部側に隠す。
【００２３】
図２は、このように立体的にしたエアバッグ１を側面から見た図であり、図３は、エアバッグ１を上方から見た図である。図２の側面図から明らかなように、上側基布２及び下側基布３の角部Ｃ同士を対応させた状態で、後面部６の中間線Ｓに縫製している個所Ｐは、３本の縫製部が集合する部分でもあるが、この個所Ｐにおいて、角部Ｃが鈍角θ（換言すると、二つの角部Ｃの角度θの和が１８０度以上）であるために、後面部６の上下中央に相当する中間線Ｓが、立体化されたエアバッグ１における後面部６の上端及び後端よりも前側に位置し、後面部６は側面から見て「くの字状」に凹んだ状態となる。内部からガス圧を受けて膨張しても、平坦に近い面になり、中間線Ｓ付近が部分的に後方へ突出したようにならない。従って、乗員を平坦に近い後面部６によって広い面積で受け止めることができ、乗員の保護性能が向上する。
【００２４】
図４は、この発明の第２実施形態を示す図である。この第２実施形態では、後面部６を、上側基布１０でなく、下側基布１１に形成した例を示す。このように後面部６を下側基布１１に形成しても、先の実施形態と同様に、後面部６を平坦に近い面にすることができる。
【００２５】
図５は、この発明の第３実施形態を示す図である。この第３実施形態では、後面部１２、１３を中間線から半分にして、上側基布１４及び下側基布１５にそれぞれ形成した例を示す。このように後面部１２、１３を半分にして上側基布１４及び下側基布１５に形成しても、先の実施形態と同様に、後面部１２、１３を平坦に近い面にすることができる。尚、この実施形態の場合は、半分づつにした後面部１２、１３を縫製するための縫製部が１本増える。
【００２６】
図６〜図８は、この発明の第４実施形態を示す図である。この第４実施形態は、基本的に第１実施形態と同様であるが、上側基布１６及び下側基布１７の各三角形Ｔにおける鈍角θの角部Ｃを規定する二辺のうち、その一方に沿う側面上半部５及び側面下半部８の後縁５ｂ′、８ｂ′が、該三角形Ｔの外側まで延長された長さに設定されている。そのため、側面上半部５及び側面下半部８の下縁５ａ、上縁８ａの後側が、該三角形Ｔの外側に膨らんだ形状をしている。また、それに合わせて、後面部１８の側縁１８ａの中間線Ｓを境界にした前半分及び後半分の長さも、延長された後縁５ｂ′、８ｂ′と同じ長さに設定されている。
【００２７】
この第４実施形態によれば、３本以上の縫製部が集合する個所Ｐにおいて、該個所Ｐに関連する３本のうち、延長された後縁５ｂ′、８ｂ′に相当する縫製部に長さ的な余裕をもたせることができる。従って、エアバッグの膨脹時における前記個所Ｐへの応力集中が緩和され、特別な補強を施さなくても、その個所Ｐからの破断が防止される。
【００２８】
図９は、この発明の第５実施形態を示す図である。この第５実施形態では、上側基布１９及び下側基布２０の各三角形Ｔにおける鈍角θの角部Ｃを規定する二辺のうち、その一方に沿う側面上半部５及び側面下半部８の下縁５ａ′及び上縁８ａ′が、該三角形Ｔの外側まで延長された長さに設定されている。そのため、側面上半部５及び側面下半部８の後縁５ｂ、８ｂの上下縁側が、該三角形Ｔの外側に膨らんだ形状をしている。また、後面部１８の側縁１８ａの中間線Ｓを境界にした前半分及び後半分の長さも同様に延長されている。従って、先の第４実施形態と同様に、エアバッグの膨脹時において縫製部が集合する個所への応力集中が緩和され、特別な補強を施さなくても、その個所からの破断が防止される。
【００２９】
尚、以上の各実施形態では、角部Ｃを鈍角θにする例を示したが、直角でも良い。
【００３０】
【発明の効果】
この発明によれば、後面部を上側基布側に有するエアバッグが膨脹した状態において、上側基布及び下側基布の角部が縫製される後面部の中間部分が、前後方向において、立体化されたエアバッグにおける後面部の上端又は下端と同じ位置か、それより前側に位置するため、後面部は平坦或いは凹んだ状態となる（膨脹しても平坦に近い面になる）。また、上下方向において、後面部の中間部分を挟んでオフセットできるため、自動車の車室内の形状に合った後面部とすることができ、後端部は平坦或いは凹んだ状態となる。従って、乗員を広い面積で受け止めることができ、乗員の保護性能が向上する。
【図面の簡単な説明】
【図１】第１実施形態に係り、（ａ）が上側基布の展開形状を示す図で、（ｂ）が下側基布の展開形状を示す図。
【図２】袋状に縫製した第１実施形態のエアバッグを示す側面図。
【図３】袋状に縫製した第１実施形態のエアバッグを示す平面図。
【図４】第２実施形態に係り、（ａ）が上側基布の展開形状を示す図で、（ｂ）が下側基布の展開形状を示す図。
【図５】第３実施形態に係り、（ａ）が上側基布の展開形状を示す図で、（ｂ）が下側基布の展開形状を示す図。
【図６】第４実施形態に係り、（ａ）が上側基布の展開形状を示す図で、（ｂ）が下側基布の展開形状を示す図。
【図７】袋状に縫製した第４実施形態のエアバッグを示す側面図。
【図８】袋状に縫製した第４実施形態のエアバッグを示す平面図。
【図９】第５実施形態に係り、（ａ）が上側基布の展開形状を示す図で、（ｂ）が下側基布の展開形状を示す図。
【符号の説明】
１エアバッグ
２、１０、１４、１６、１９上側基布
３、１１、１５、１７、２０下側基布
４上面部
５側面上半部
６、１２、１３、１８後面部
７下面部
８側面下半部
Ｃ角部
θ 鈍角
Ｓ後面部の中間線
Ｌ補助直線
Ｔ三角形
Ｐ縫製が集合した個所[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a passenger airbag.
[0002]
[Prior art]
The airbag device on the passenger seat side of an automobile has a structure in which an airbag is stored in a folded state on an instrument panel in front of the passenger compartment. An air bag is a bag that is made by sewing an upper base fabric and a lower base fabric, and is inflated by gas blown from an inflator at the time of a collision. The occupant is received and protected (refer to Japanese Patent Application Laid-Open No. 2002-172992 as a similar technique).
[0003]
Inside this type of airbag, a tether belt extending in the front-rear direction is provided from the vicinity of the gas inlet formed on the front side of the airbag to the rear surface portion for receiving the occupant formed on the rear side. By this tether belt, the central portion of the rear surface portion of the airbag is pulled to the front side, and the rear surface portion is made to be a surface that is almost flat with respect to the occupant (including a gentle convex and a gentle concave). By making the rear surface nearly flat, the occupant can be received in a large area, and the protection performance of the occupant is enhanced.
[0004]
[Problems to be solved by the invention]
However, in such a conventional technique, it is necessary to provide a tether belt inside the airbag in order to make the rear surface portion of the airbag that catches the occupant nearly flat, and the number of parts and manufacturing man-hours are reduced. An increase was incurred.
[0005]
The present invention has been made by paying attention to such a conventional technique, and provides a passenger seat airbag in which a rear surface portion can be made almost flat without using a tether belt.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is an upper base fabric in which a substantially triangular side upper half is integrally formed on both left and right edges of the upper surface, and a rear surface is integrally formed on the rear end of the upper surface. An airbag for a passenger seat, in which a lower base fabric integrally formed with a substantially triangular side lower half on both left and right edges of a lower surface is formed into a bag shape by sewing, wherein the side upper half and the side In each of the lower half, when the intersection of each edge is connected by a straight line to form a triangle, the sum of the angles of the two corners composed of two sides that are not the boundary line with the upper surface or the lower surface is 180 degrees. der is, an intermediate line corresponding to the vertical center of the rear surface portion is positioned on the front side than the upper end and the rear end of the rear surface portion in the three-dimensional and airbag, rear portion is viewed from the side "dogleg or rear surface portion is characterized by comprising the near flat face when the airbag deployed with the dented state of the Jo "
[0007]
According to the first aspect of the present invention, in the state where the airbag having the rear surface portion on the upper base fabric side is inflated, an intermediate portion of the rear surface portion where the corner portions of the upper base fabric and the lower base fabric are sewn, In the front-rear direction, the rear surface portion is in the same position as the upper end or lower end of the rear surface portion of the three-dimensional airbag or in front of it, so that the rear surface portion is flat or recessed (even if inflated, the surface is almost flat. Become). In addition, since it can be offset across the middle portion of the rear surface portion in the vertical direction, it can be a rear surface portion that matches the shape of the interior of the automobile, and the rear end portion is flat or recessed. Accordingly, the occupant can be received in a wide area, and the occupant protection performance is improved.
[0008]
The invention according to claim 2 is an upper base fabric in which a substantially triangular side upper half is integrally formed on both left and right edges of the upper surface, and a substantially triangular side lower half on both left and right edges of the lower surface. And a lower base fabric in which a rear surface portion is integrally formed at the rear end of the lower surface portion. In each of the lower half, when the intersection of each edge is connected by a straight line to form a triangle, the sum of the angles of the two corners composed of two sides that are not the boundary line with the upper surface or the lower surface is 180 degrees. der is, an intermediate line corresponding to the vertical center of the rear surface portion is positioned in front of the upper end and the rear end of the rear surface portion in the three-dimensional and airbag, rear portion is viewed from the side "dogleg or rear surface portion is characterized by comprising the near flat face when the airbag deployed with the dented state of the Jo "
[0009]
According to invention of Claim 2, even if it is an airbag which provided the back surface part in the lower base fabric side, the effect similar to the previous term is acquired.
[0010]
According to a third aspect of the present invention, there is provided an upper base fabric in which a substantially triangular side upper half is integrally formed on both left and right edges of the upper surface, and a half of the rear surface is integrally formed on the rear end of the upper surface. And a lower base fabric in which a substantially triangular side lower half is integrally formed on the left and right edges of the lower surface and a rear half is integrally formed on the rear end of the lower surface. An airbag for a passenger's seat that is shaped like a triangle formed by connecting intersections of each edge with a straight line in each of the upper half of the side and the lower half of the side. the sum of the angles of the two corners made of two sides not border state, and are more than 180 degrees, an intermediate line corresponding to the vertical center of the rear surface portion, the upper end and after the rear part of the three-dimensional and airbag It is located on the front side of the edge, and the rear surface part is recessed in a “U” shape when viewed from the side, and the airbag is Rear surface portion is characterized by comprising the near flat plane upon deployment.
[0011]
According to the third aspect of the present invention, even if the airbag is provided with half of the rear surface part on the upper base fabric and the lower base fabric, the same effect as in the previous item can be obtained.
[0012]
The invention according to claim 4 is characterized in that a corner portion composed of two sides which is not a boundary line with the upper surface portion or the lower surface portion is a right angle or an obtuse angle.
[0013]
According to the fourth aspect of the present invention, in the state where the airbag is inflated, the position where the corners of the upper base fabric and the lower base fabric are sewn is an intermediate portion of the rear surface portion. It can be received, and passenger protection performance is further improved.
[0014]
The invention according to claim 5 is a length in which the edges of the upper half of the side surface and the lower half of the side surface along at least one of the two sides defining the corner of the triangle are extended to the outside of the triangle. The side edge of the rear surface portion that is set to the length and is sewn to the extended edge portion is set to the same length.
[0015]
According to the fifth aspect of the present invention, at a place where three or more sewing parts are gathered, at least one sewing part among the three or more sewing parts related to the part has a long margin. As a result, the concentration of stress during inflation of the airbag is alleviated, and breakage from the location can be prevented without special reinforcement.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings. In the present specification, “front side” is a direction corresponding to the front side of the vehicle in a state where it is mounted on the vehicle, and “rear side” is the opposite. Furthermore, in each embodiment shown below, the same code | symbol is attached | subjected to a common part and the overlapping description is abbreviate | omitted.
[0017]
1 to 3 are views showing a first embodiment of the present invention. The airbag 1 of this embodiment is composed of two upper base fabrics 2 and a lower base fabric 3 made of nylon 66 woven fabric with a non-coated basis weight of 200 g / m ² .
[0018]
FIG. 1 is a diagram showing the upper base fabric 2 and the lower base fabric 3 in an unfolded state. The upper base fabric 2 has a substantially triangular side upper half 5 integrally formed on both left and right edges of a rectangular upper surface 4. Of the lower half 5a and the rear edge 5b which are not the boundary with the upper surface part 4, the side upper half 5 has a straight lower edge 5a but a curved rear edge 5b.
[0019]
At the rear end of the upper surface portion 4, a tall-shaped rear surface portion 6 is integrally formed. The rear surface portion 6 has a front / rear object shape via the intermediate line S, and the length of the front half of the side edge 6 a of the rear surface portion 6 corresponds to the length of the rear edge 5 b of the side surface upper half portion 5.
[0020]
The lower base fabric 3 has a shape in which a substantially triangular side lower half 8 is integrally formed on both left and right edges of a rectangular bottom surface portion 7, and a shape in which the rear surface portion 6 is removed from the upper base fabric 2. The same. A gas introduction port 9 that is fixed to an inflator (not shown) and that introduces gas from the inflator is formed in front of the lower surface portion 7. The upper edge 8a of the lower side half 8 is straight and the rear edge 8b is curved. The length of the rear edge 8b of the side lower half portion 8 corresponds to the length of the rear half of the side edge 6a of the rear surface portion 6.
[0021]
In the upper half 5 of the side surface of the upper base fabric 2, when the intersection of each edge is connected by a straight line to form a triangle T, two sides that are not the boundary line with the upper surface 4, that is, the lower edge 5a and the rear edge 5b The corner C formed from the auxiliary straight line L is an obtuse angle θ. Similarly, the lower base fabric 3 also has two sides that are not boundaries with the lower surface portion 7 when the intersections of the respective edges are connected by straight lines in the lower half portion 8 of the side surface, that is, the upper edge. A corner C formed by 8a and the auxiliary straight line L of the rear edge 8b is an obtuse angle θ. In other words, the sum of the angles θ of the two corners C is 180 degrees or more.
[0022]
In order to form a three-dimensional bag-like airbag 1 from the upper base fabric 2 and the lower base fabric 3 cut into such a shape, first, the upper base fabric 2 and the lower base fabric 3 are In the state where each is turned over, the rear edge 5b in the upper half portion 5 of the side surface of the upper base fabric 2 and the front half of the side edge 6a of the rear surface portion 6 are sewn. Next, the front edges of the upper surface portion 4 and the lower surface portion 7, the lower edge 5 a and the upper edge 8 a of the side upper half 5 and the lower surface half 8, and the side edges of the rear edge 8 b and the rear surface 6 of the side lower half 8. The rear half of 6a, the rear end 6 and the rear end 7 are sewn together to form a bag. Finally, the whole is turned over from the gas inlet 9 and the sewn end is hidden inside the airbag 1.
[0023]
FIG. 2 is a view of the three-dimensional airbag 1 as viewed from the side, and FIG. 3 is a view of the airbag 1 as viewed from above. As apparent from the side view of FIG. 2, the portion P sewn on the intermediate line S of the rear surface portion 6 in the state where the corner portions C of the upper base fabric 2 and the lower base fabric 3 correspond to each other is 3 Although this is also a part where the sewing parts of the book are gathered, at this point P, the corner C is an obtuse angle θ (in other words, the sum of the angles θ of the two corners C is 180 degrees or more). An intermediate line S corresponding to the center of the upper and lower sides of the three-dimensional airbag 1 is positioned in front of the upper end and the rear end of the rear surface portion 6, and the rear surface portion 6 is recessed in a “U” shape when viewed from the side surface. It becomes a state. Even if it expands by receiving gas pressure from the inside, it becomes a nearly flat surface, and the vicinity of the intermediate line S does not partially protrude backward. Accordingly, the occupant can be received in a wide area by the rear surface portion 6 that is almost flat, and the protection performance of the occupant is improved.
[0024]
FIG. 4 is a diagram showing a second embodiment of the present invention. In the second embodiment, an example in which the rear surface portion 6 is formed not on the upper base fabric 10 but on the lower base fabric 11 is shown. As described above, even when the rear surface portion 6 is formed on the lower base fabric 11, the rear surface portion 6 can be made almost flat as in the previous embodiment.
[0025]
FIG. 5 is a diagram showing a third embodiment of the present invention. In the third embodiment, an example in which the rear surface portions 12 and 13 are formed on the upper base fabric 14 and the lower base fabric 15 by halving from the intermediate line is shown. Thus, even if the rear surface portions 12 and 13 are halved and formed on the upper base fabric 14 and the lower base fabric 15, the rear surface portions 12 and 13 can be made nearly flat as in the previous embodiment. it can. In the case of this embodiment, the number of the sewing parts for sewing the half of the rear surface parts 12 and 13 is increased by one.
[0026]
6 to 8 are views showing a fourth embodiment of the present invention. This fourth embodiment is basically the same as the first embodiment, but of the two sides that define the corner C of the obtuse angle θ in each triangle T of the upper base fabric 16 and the lower base fabric 17, The rear edges 5b 'and 8b' along the one side upper half 5 and the lower side half 8 are set to extend to the outside of the triangle T. Therefore, the rear side of the lower edge 5a and the upper edge 8a of the side upper half 5 and the side lower half 8 has a shape that swells outside the triangle T. In accordance with this, the lengths of the front half and the latter half of the side edge 18a of the rear surface 18 with the intermediate line S as the boundary are also set to the same length as the extended rear edges 5b 'and 8b'.
[0027]
According to the fourth embodiment, at the portion P where three or more sewing portions are gathered, the length of the sewing portion corresponding to the extended rear edges 5b 'and 8b' of the three pieces related to the portion P is long. It is possible to give a reasonable margin. Therefore, the stress concentration on the portion P when the airbag is inflated is alleviated, and breakage from the portion P can be prevented without special reinforcement.
[0028]
FIG. 9 is a diagram showing a fifth embodiment of the present invention. In the fifth embodiment, of the two sides defining the obtuse angle θ of each triangle T of the upper base fabric 19 and the lower base fabric 20, the side upper half 5 and the side lower half along one of them. 8, the lower edge 5a 'and the upper edge 8a' are set to extend to the outside of the triangle T. Therefore, the upper and lower edge sides of the rear edges 5b, 8b of the side upper half 5 and the side lower half 8 have a shape that swells outside the triangle T. In addition, the lengths of the front half and the latter half of the side edge 18a of the rear surface portion 18 with the intermediate line S as a boundary are also extended. Therefore, as in the fourth embodiment, stress concentration at the place where the sewing parts gather when the airbag is inflated is alleviated, and breakage from that place can be prevented without special reinforcement. .
[0029]
In each of the above embodiments, an example in which the corner portion C is an obtuse angle θ is shown, but a right angle may be used.
[0030]
【The invention's effect】
According to the present invention, in the state where the airbag having the rear surface portion on the upper base fabric side is inflated, the intermediate portion of the rear surface portion where the corner portions of the upper base fabric and the lower base fabric are sewn is three-dimensional in the front-rear direction. Since it is located at the same position as the upper end or the lower end of the rear surface portion in the formed airbag or at the front side thereof, the rear surface portion is flat or recessed (even if inflated, it becomes a surface that is nearly flat). In addition, since it can be offset across the middle portion of the rear surface portion in the vertical direction, it can be a rear surface portion that matches the shape of the interior of the automobile, and the rear end portion is flat or recessed. Accordingly, the occupant can be received in a wide area, and the occupant protection performance is improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a developed shape of an upper base fabric according to the first embodiment, and (b) is a diagram showing a developed shape of a lower base fabric.
FIG. 2 is a side view showing the airbag of the first embodiment sewn in a bag shape.
FIG. 3 is a plan view showing the airbag of the first embodiment sewn in a bag shape.
FIG. 4 is a diagram showing a developed shape of the upper base fabric according to the second embodiment, and (b) is a diagram showing a developed shape of the lower base fabric.
FIG. 5 is a diagram showing a developed shape of the upper base fabric according to the third embodiment, and (b) is a diagram showing a developed shape of the lower base fabric.
6A is a diagram showing a developed shape of an upper base fabric, and FIG. 6B is a diagram showing a developed shape of a lower base fabric according to a fourth embodiment.
FIG. 7 is a side view showing an airbag according to a fourth embodiment sewn in a bag shape.
FIG. 8 is a plan view showing an airbag according to a fourth embodiment sewn in a bag shape.
FIG. 9 is a diagram showing a developed shape of the upper base fabric according to the fifth embodiment, and (b) is a diagram showing a developed shape of the lower base fabric.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Airbag 2, 10, 14, 16, 19 Upper base fabric 3, 11, 15, 17, 20 Lower base fabric 4 Upper surface part 5 Side upper half 6, 12, 13, 18 Rear surface part 7 Lower surface part 8 Side surface Lower half C Corner part θ Obtuse angle S Middle line L on the back surface Supplementary straight line T Triangle P Where sewing is gathered

Claims

An upper base fabric having a substantially triangular side upper half formed integrally on the left and right edges of the upper surface portion and a rear surface portion integrally formed on the rear end of the upper surface portion, and a substantially triangular shape on the left and right edges of the lower surface portion A passenger seat airbag in which a lower base fabric integrally formed with a lower side half of the shape is formed into a bag shape by sewing,
In each of the upper half of the side surface and the lower half of the side surface, when the intersection of each edge is connected by a straight line to form a triangle, two corners composed of two sides that are not the boundary line with the upper surface portion or the lower surface portion. the sum of the angle state, and are more than 180 degrees, an intermediate line corresponding to the vertical center of the rear surface portion is positioned in front of the upper end and the rear end of the rear surface portion in the three-dimensional and airbag, the rear surface portion side An airbag for a passenger's seat, characterized in that it is in a state of being concaved in a “U” shape as viewed from the top, and the rear surface portion becomes a nearly flat surface when the airbag is deployed .

An upper base fabric integrally formed with a substantially triangular side upper half on both left and right edges of the upper surface portion, and a substantially triangular side lower half on the left and right edges of the lower surface portion integrally formed with the lower surface portion A passenger seat airbag in which a lower base fabric integrally formed with a rear surface portion at the rear end is formed into a bag shape by sewing,
In each of the upper half of the side surface and the lower half of the side surface, when the intersection of each edge is connected by a straight line to form a triangle, two corners composed of two sides that are not the boundary line with the upper surface portion or the lower surface portion. the sum of the angle state, and are more than 180 degrees, an intermediate line corresponding to the vertical center of the rear surface portion is positioned in front of the upper end and the rear end of the rear surface portion in the three-dimensional and airbag, the rear surface portion side An airbag for a passenger's seat, characterized in that it is in a state of being concaved in a “U” shape as viewed from the top, and the rear surface portion becomes a nearly flat surface when the airbag is deployed .

An upper base fabric in which upper and lower half portions of a substantially triangular shape are integrally formed on both left and right edges of the upper surface portion, and a half of the rear surface portion is integrally formed on the rear end of the upper surface portion, and both left and right edges of the lower surface portion. An airbag for a passenger's seat in which a substantially lower triangular side surface half is integrally formed and a lower base fabric in which a rear half is integrally formed at the rear end of the lower surface portion is formed into a bag shape by sewing. There,
In each of the upper half of the side surface and the lower half of the side surface, when the intersection of each edge is connected by a straight line to form a triangle, two corners composed of two sides that are not the boundary line with the upper surface portion or the lower surface portion. the sum of the angle state, and are more than 180 degrees, an intermediate line corresponding to the vertical center of the rear surface portion is positioned in front of the upper end and the rear end of the rear surface portion in the three-dimensional and airbag, the rear surface portion side An airbag for a passenger's seat, characterized in that it is in a state of being concaved in a “U” shape as viewed from the top, and the rear surface portion becomes a nearly flat surface when the airbag is deployed .

The airbag for a passenger seat according to any one of claims 1 to 3,
An airbag for a passenger seat, characterized in that a corner portion composed of two sides that is not a boundary line with the upper surface portion or the lower surface portion is a right angle or an obtuse angle.

An airbag for a passenger seat according to any one of claims 1 to 4,
The edge of the upper half of the side surface and the lower half of the side surface along at least one of the two sides defining the corner of the triangle is set to a length that extends to the outside of the triangle, and is extended. An airbag for a passenger seat, wherein the side edges of the rear surface portion sewn on the edge portion are set to the same length.