JP2007055501A - Airbag device for passenger seat - Google Patents

Airbag device for passenger seat Download PDF

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JP2007055501A
JP2007055501A JP2005244738A JP2005244738A JP2007055501A JP 2007055501 A JP2007055501 A JP 2007055501A JP 2005244738 A JP2005244738 A JP 2005244738A JP 2005244738 A JP2005244738 A JP 2005244738A JP 2007055501 A JP2007055501 A JP 2007055501A
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airbag
passenger seat
strap
passenger
bag
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Yoshihiro Kawamoto
吉弘 河本
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for a passenger seat capable of stabilizing the position of a recessed part formed in a nearly central part of an occupant restraint surface of the airbag in relation to the occupant, and furthermore capable of deploying the bag into a proper shape in response to vehicle shape. <P>SOLUTION: An inside base cloth 24 and an outside base cloth 26 structuring a right and a left side surfaces of the airbag 12 for a passenger seat and the occupant restraint surface 28A are connected to each other by a strap 34 formed into truss shape with a plane view. Dimension L2 of the outside inclined strap part 34D of the strap 34 is formed shorter than dimension L3 of the inside inclined strap part 34E so that cross directional position of the recessed part 36 formed in the height direction of the bag in a nearly central part of the occupant restraint surface 28A can be positioned on the center line X of a passenger P seating on the passenger seat. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、前面衝突時に助手席に着座した乗員側へ向けて膨出展開する助手席用エアバッグ装置に関する。   The present invention relates to an airbag device for a passenger seat that bulges and expands toward the occupant side seated in the passenger seat at the time of a frontal collision.

下記特許文献１には、前面衝突時に助手席に着座する乗員の前方左側へ膨出展開する左側エアバッグと、乗員の前方右側へ膨出展開する右側エアバッグとを備え、双方のエアバッグの先端部の間に上下方向に凹状となる空間部が形成された助手席用エアバッグ装置が開示されている。さらに、この助手席用エアバッグ装置では、左側エアバッグと右側エアバッグのバッグ展開方向中間部同士をストラップで相互に連結することにより、空間部が不用意に広がらないように構成されている。
特開２００４−２４４００５号公報 The following Patent Document 1 includes a left airbag that bulges and expands to the front left side of an occupant seated in a passenger seat at the time of a frontal collision, and a right airbag that bulges and deploys to the front right side of the occupant. An airbag device for a passenger seat is disclosed in which a space portion that is concave in the vertical direction is formed between the front end portions. Furthermore, the passenger seat airbag device is configured so that the intermediate portions of the left airbag and the right airbag are connected to each other with a strap so that the space portion does not inadvertently spread.
JP 2004-244005 A

しかしながら、上記先行技術に開示された構成による場合、左側エアバッグと右側エアバッグとは、バッグ展開方向中間部同士にてストラップで左右方向に連結されるのみとなるため、上下方向に凹状とされた空間部の位置が助手席に着座する乗員の頭部位置に対して狙い通りにならないことが考えられる。従って、左右のエアバッグ間に形成される凹部位置を助手席に着座する乗員に対して安定化させることが望まれていた。   However, in the case of the configuration disclosed in the above prior art, the left airbag and the right airbag are only connected in the lateral direction with straps at the middle part of the bag deployment direction, and thus are recessed in the vertical direction. It is conceivable that the position of the space portion is not as intended with respect to the head position of the passenger seated in the passenger seat. Therefore, it has been desired to stabilize the position of the recess formed between the left and right airbags for an occupant seated in the passenger seat.

さらに好ましくは、左右のバッグ形状を助手席側の車両形状に合わせて適正化する必要があるが、上記先行技術に開示された構成ではバッグ構造が複雑過ぎて前記適正化を図ろうとするとコストアップを招く。   More preferably, it is necessary to optimize the shape of the left and right bags according to the shape of the vehicle on the passenger seat side. However, in the configuration disclosed in the above prior art, the bag structure is too complicated and the optimization is attempted to increase the cost. Invite.

本発明は上記事実を考慮し、エアバッグの乗員拘束面の略中央部に形成される凹部の乗員に対する位置を安定化させることができ、更には車両形状に合わせてバッグ展開形状の適正化を図ることができる助手席用エアバッグ装置を得ることが目的である。   In consideration of the above facts, the present invention can stabilize the position of the recess formed in the substantially central portion of the occupant restraint surface of the airbag with respect to the occupant, and further optimize the bag deployment shape according to the vehicle shape. It is an object to obtain an airbag device for a passenger seat that can be achieved.

請求項１の本発明は、前面衝突時に作動してガスを発生するガス発生装置と、通常時においてはインストルメントパネルの内側に折り畳み状態で格納されると共に前面衝突時になるとガス発生装置によって発生したガスの供給を受けて助手席に着座する乗員側へ向けて膨出展開し、更に膨出方向側に位置する乗員拘束面の略中央部にバッグ高さ方向に延在する凹部が形成されたエアバッグと、を備えた助手席用エアバッグ装置であって、前記エアバッグの左右両側面と前記乗員拘束面とを平面視でトラス状に連結するストラップを設けた、ことを特徴としている。   The present invention of claim 1 is generated by the gas generator that generates gas by operating at the time of a frontal collision, and is stored in a folded state inside the instrument panel in a normal state and is generated by the gas generator when a frontal collision occurs. A recess extending in the bag height direction is formed at the substantially central portion of the occupant restraint surface located on the bulging direction side and bulging and deploying toward the occupant side seated in the passenger seat upon receiving gas supply An airbag device for a passenger's seat comprising an airbag, wherein a strap for connecting the left and right side surfaces of the airbag and the occupant restraint surface in a truss shape in plan view is provided.

請求項２の本発明は、請求項１記載の助手席用エアバッグ装置において、前記ストラップは一本の帯状部材によって構成されている、ことを特徴としている。   According to a second aspect of the present invention, in the airbag device for a passenger seat according to the first aspect, the strap is constituted by a single band-shaped member.

請求項１記載の本発明によれば、通常時においてはインストルメントパネルの内側にエアバッグは折り畳み状態で格納されている。   According to the first aspect of the present invention, in the normal state, the airbag is stored in a folded state inside the instrument panel.

この状態から前面衝突時になると、ガス発生装置によってガスが発生される。このガスの供給を受けて折り畳み状態で格納されたエアバッグが膨張して、助手席に着座する乗員側へ向けて膨出展開される。これにより、助手席に着座する乗員は、展開したエアバッグの膨出方向側に位置する乗員拘束面によって拘束され、衝撃が吸収される。特に、このエアバッグでは、乗員拘束面の略中央部にバッグ高さ方向に延在する凹部が形成されているため、乗員の頭部は当該凹部に入り込み、エアバッグから受ける反力が効果的に軽減されるというメリットがある。   When a frontal collision occurs from this state, gas is generated by the gas generator. The airbag stored in the folded state is supplied with this gas supply, and is inflated and deployed toward the occupant side seated in the passenger seat. As a result, the occupant seated in the passenger seat is restrained by the occupant restraint surface located on the inflating direction side of the deployed airbag, and the impact is absorbed. In particular, in this airbag, since a recess extending in the bag height direction is formed in the substantially central portion of the occupant restraint surface, the head of the occupant enters the recess and the reaction force received from the airbag is effective. There is a merit that it is reduced.

ここで、本発明では、上記エアバッグの左右両側面と乗員側拘束面とを平面視でトラス状に連結するストラップを設けたので、左右両側面を繋ぐストラップの長さＬ１を調整することにより、展開状態のエアバッグの幅方向寸法を変更することができる。また、乗員側から見て右側面と乗員拘束面とを連結するストラップの長さＬ２と左側面と乗員拘束面とを連結するストラップの長さＬ３の長さを調整することにより、凹部の形成位置をバッグ幅方向に任意にずらすことができる。   Here, in the present invention, since the strap for connecting the left and right side surfaces of the airbag and the occupant side restraint surface in a truss shape in plan view is provided, by adjusting the length L1 of the strap connecting the left and right side surfaces The width direction dimension of the airbag in the deployed state can be changed. Further, the concave portion is formed by adjusting the length L2 of the strap connecting the right side surface and the occupant restraint surface and the length L3 of the strap connecting the left side surface and the occupant restraint surface when viewed from the occupant side. The position can be arbitrarily shifted in the bag width direction.

請求項２記載の本発明によれば、上記ストラップが一本の帯状部材によって構成されているため、部品点数を最小限に抑えることができる。   According to the second aspect of the present invention, since the strap is constituted by a single band-shaped member, the number of parts can be minimized.

以上説明したように、請求項１記載の本発明に係る助手席用エアバッグ装置は、エアバッグの左右両側面と乗員拘束面とを平面視でトラス状に連結するストラップを設けたので、ストラップの辺長を変えることにより、エアバッグの乗員拘束面の略中央部に形成される凹部の乗員に対する位置を安定化させることができ、更には車両形状に合わせてバッグ展開形状の適正化を図ることができるという優れた効果を有する。   As described above, the airbag device for a passenger seat according to the first aspect of the present invention is provided with the strap for connecting the left and right side surfaces of the airbag and the passenger restraint surface in a truss shape in plan view. By changing the side length of the airbag, the position of the recess formed in the substantially central portion of the passenger restraining surface of the airbag relative to the passenger can be stabilized, and further, the bag deployment shape can be optimized according to the vehicle shape. It has an excellent effect of being able to.

請求項２記載の本発明に係る助手席用エアバッグ装置は、請求項１記載の発明において、ストラップを一本の帯状部材によって構成したので、部品点数削減によるコストダウン及び重量低減を図ることができるという優れた効果を有する。   According to the second aspect of the present invention, the airbag device for a passenger seat according to the first aspect of the present invention is the strap according to the first aspect of the present invention, and the strap is constituted by a single belt-like member. It has an excellent effect of being able to.

以下、図１〜図３を用いて、本発明に係る助手席用エアバッグ装置の一実施形態について説明する。なお、これらの図において適宜示される矢印ＦＲは車両前方側を示しており、矢印ＵＰは車両上方側を示しており、矢印ＩＮは車両幅方向内側を示している。また、これらの図は、左ハンドル車で示されている。   Hereinafter, an embodiment of an airbag device for a passenger seat according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side. Also, these figures are shown with a left-hand drive vehicle.

図２には本実施形態に係る助手席用エアバッグ装置１０が備える助手席用エアバッグ１２の展開状態の斜視図が示されており、又図３には当該助手席用エアバッグ１２の展開状態の側面図が示されている。さらに、図１には、助手席用エアバッグ１２の展開状態の水平断面図が示されている。   FIG. 2 is a perspective view showing a state in which a passenger seat airbag 12 included in the passenger seat airbag apparatus 10 according to the present embodiment is deployed, and FIG. 3 shows the deployment of the passenger seat airbag 12. A side view of the condition is shown. Furthermore, FIG. 1 shows a horizontal sectional view of the passenger seat airbag 12 in a deployed state.

これらの図に示されるように、助手席用エアバッグ装置１０は、インストルメントパネル１４における助手席と対向する位置に配設されている。インストルメントパネル１４には、助手席用エアバッグ１２を膨出展開させるためのバッグ膨出用開口部１６（図２参照）が形成されている。バッグ膨出用開口部１６は、通常は前後一対のエアバッグドア１８（図３参照。図２では図示省略）によって閉止されており、前面衝突時にバッグ膨張圧が所定値以上になるとティアライン（破断部）に沿って破断して前後に展開するようになっている。なお、このエアバッグドア１８は前後に展開する両開きタイプのエアバッグドアであるが、一方向にのみ展開するエアバッグドアを採用してもよいし、前後左右に展開するエアバッグドアを採用してもよい。   As shown in these drawings, the passenger seat airbag device 10 is disposed at a position facing the passenger seat in the instrument panel 14. The instrument panel 14 is formed with a bag inflation opening 16 (see FIG. 2) for inflating and deploying the passenger seat airbag 12. The bag inflation opening 16 is normally closed by a pair of front and rear airbag doors 18 (see FIG. 3; not shown in FIG. 2). When the bag inflation pressure exceeds a predetermined value during a frontal collision, a tear line ( It breaks along the broken part) and expands back and forth. The airbag door 18 is a double-opening type airbag door that expands forward and backward. However, an airbag door that expands in only one direction may be used, or an airbag door that expands in the front-rear and left-right directions. May be.

図３に示されるように、上記バッグ膨出用開口部１６の奥側（インストルメントパネル１４の内方）には、略箱体形状のエアバッグケース２０が配設されている。エアバッグケース２０内には、前面衝突時にガスを噴出する略円柱形状のガス発生装置としてのインフレータ２２及びインフレータ２２から噴出されたガスによって膨張する助手席用エアバッグ１２が折り畳み状態で格納されている。なお、エアバッグケース２０は、図示しないブラケットを介してインパネリインフォースメント等の高強度部材に支持されている。   As shown in FIG. 3, a substantially box-shaped airbag case 20 is disposed on the back side of the bag inflation opening 16 (inward of the instrument panel 14). In the airbag case 20, an inflator 22 as a substantially cylindrical gas generator that ejects gas at the time of a frontal collision and a passenger seat airbag 12 that is inflated by the gas ejected from the inflator 22 are stored in a folded state. Yes. The airbag case 20 is supported by a high-strength member such as instrument panel reinforcement via a bracket (not shown).

次に本実施形態の要部に係る助手席用エアバッグ１２の構造について詳細に説明する。   Next, the structure of the passenger airbag 12 according to the main part of the present embodiment will be described in detail.

図１及び図２に示されるように、助手席用エアバッグ１２はシングルエアバッグとして構成されており、両側面を構成する内側基布２４、外側基布２６並びに中央部を構成する中央側基布２８といった三枚の基布で構成されている。内側基布２４の周縁部と中央側基布２８の周縁部とは内側縫製部３０にて縫製されている。また、外側基布２６の周縁部と中央側基布２８の周縁部とは外側縫製部３２にて縫製されている。   As shown in FIGS. 1 and 2, the passenger seat airbag 12 is configured as a single airbag, and has an inner base fabric 24, an outer base fabric 26 that constitute both side surfaces, and a central side base that constitutes a central portion. It is composed of three base fabrics such as cloth 28. The peripheral edge of the inner base fabric 24 and the peripheral edge of the central base fabric 28 are sewn by an inner sewing portion 30. Further, the peripheral edge portion of the outer base cloth 26 and the peripheral edge portion of the central base cloth 28 are sewn by the outer sewing portion 32.

さらに、助手席用エアバッグ１２の内部には本実施形態の要部に係るトラス型のストラップ３４が配設されており、これにより中央側基布２８の膨出方向側に位置する乗員拘束面２８Ａの略中央部（バッグ幅方向の略中間部）にバッグ高さ方向に延在する凹部３６が形成されていると共に、凹部３６の左右に内側バッグ部１２Ａ及び外側バッグ部１２Ｂが形成されている。   Further, a truss-type strap 34 according to the main part of the present embodiment is disposed inside the passenger seat airbag 12, thereby occupant restraint surface located on the bulging direction side of the central base fabric 28. A concave portion 36 extending in the bag height direction is formed in a substantially central portion (substantially middle portion in the bag width direction) of 28A, and an inner bag portion 12A and an outer bag portion 12B are formed on the left and right sides of the concave portion 36, respectively. Yes.

詳細に説明すると、図１及び図２に示されるように、ストラップ３４は一本の帯状部材として構成されており、その両端部３４Ａ、３４Ｂは中央側基布２８の先端部（後端部）に位置する乗員拘束面２８Ａの略中央部に第１補強布３８と共に四枚重ねの状態で縫製されている（以下、縫製部位を「第１縫製部４４」と称す。）。また、ストラップ３４を略三等分した位置の片側は、第２補強布４０と共に三枚重ねの状態で外側基布２６に縫製されている（以下、縫製部位を「第２縫製部４６」と称す。）。さらに、ストラップ３４を略三等分した位置の反対側は、第３補強布４２と共に三枚重ねの状態で内側基布３０に縫製されている（以下、縫製部位を「第３縫製部４８」と称す。）。これにより、ストラップ３４は助手席用エアバッグ１２内に平面視でトラス状（三角形状）に配置されて、内側基布２４、外側基布２６、及び中央側基布２８の三者間を相互に連結している。   More specifically, as shown in FIGS. 1 and 2, the strap 34 is configured as a single band-shaped member, and both end portions 34 </ b> A and 34 </ b> B are front end portions (rear end portions) of the central base fabric 28. Is sewed together with the first reinforcing cloth 38 in a substantially overlapped state with the first reinforcing cloth 38 (hereinafter, the sewing portion is referred to as a “first sewing portion 44”). Further, one side of the position where the strap 34 is divided into approximately three equal parts is sewn to the outer base cloth 26 in a state of being overlapped with the second reinforcing cloth 40 (hereinafter, the sewing portion is referred to as “second sewing portion 46”). ). Further, the side opposite to the position where the strap 34 is divided into approximately three equal parts is sewn to the inner base fabric 30 with the third reinforcing cloth 42 in a stacked state (hereinafter referred to as a “third sewing portion 48”). Called.). As a result, the strap 34 is arranged in a truss shape (triangular shape) in the passenger seat airbag 12 in plan view, and the three members of the inner base fabric 24, the outer base fabric 26, and the central base fabric 28 are mutually connected. It is linked to.

また、図１に示される如く、内側基布２４と外側基布２６とを連結している水平ストラップ部３４Ｃの寸法をＬ１、外側基布２６と乗員拘束面２８Ａとを連結している外側傾斜ストラップ部３４Ｄの寸法をＬ２、内側基布２４と乗員拘束面２８Ａとを連結している内側傾斜ストラップ部３４Ｅの寸法をＬ３とすると、本実施形態では、Ｌ２の方がＬ３よりも短く設定されている。つまり、本実施形態では、トラス型のストラップ３４の寸法設定を「Ｌ１＞Ｌ３＞Ｌ２」の関係が成立するように設定している。   Further, as shown in FIG. 1, the horizontal strap portion 34C connecting the inner base fabric 24 and the outer base fabric 26 has a dimension L1, and the outer slope connecting the outer base fabric 26 and the occupant restraint surface 28A. If the dimension of the strap part 34D is L2, and the dimension of the inner inclined strap part 34E connecting the inner base fabric 24 and the occupant restraint surface 28A is L3, in this embodiment, L2 is set shorter than L3. ing. That is, in this embodiment, the dimension setting of the truss type strap 34 is set so that the relationship “L1> L3> L2” is established.

さらに言及すると、水平ストラップ部３４Ｃの寸法Ｌ１には助手席用エアバッグ１２の幅方向のサイズを規定する意義があり、ストラップ３４の周長（Ｌ１＋Ｌ２＋Ｌ３）には、乗員拘束面２８Ａの略中央部にバッグ上下方向に沿って形成される凹部３６の凹みの深さを規定する意義がある。さらに、外側傾斜ストラップ部３４Ｄの寸法Ｌ２及び内側傾斜ストラップ部３４Ｅの寸法Ｌ３には、凹部３６が形成される左右位置（バッグ幅方向の位置）を規定する意義がある。   Further, the dimension L1 of the horizontal strap portion 34C has a significance of defining the size of the passenger seat airbag 12 in the width direction, and the circumferential length (L1 + L2 + L3) of the strap 34 is substantially the central portion of the passenger restraint surface 28A. It is meaningful to define the depth of the recess 36 formed along the bag vertical direction. Furthermore, the dimension L2 of the outer inclined strap portion 34D and the dimension L3 of the inner inclined strap portion 34E have a significance of defining the left and right positions (positions in the bag width direction) where the recesses 36 are formed.

なお、内側基布２４及び外側基布２６においてストラップ３４と重ならない位置には、バッグ内圧低下用のベントホール５０（図２、図３参照）がそれぞれ形成されている。   In the inner base fabric 24 and the outer base fabric 26, vent holes 50 (see FIGS. 2 and 3) for reducing bag internal pressure are formed at positions where the straps 34 do not overlap.

（本実施形態の作用・効果）   (Operation and effect of this embodiment)

次に、本実施形態の作用並びに効果を説明する。   Next, the operation and effect of this embodiment will be described.

通常時においては、助手席用エアバッグ１２は折り畳み状態でエアバッグケース２０内に格納されている。   Under normal conditions, the passenger seat airbag 12 is stored in the airbag case 20 in a folded state.

この状態から前面衝突時になると、図示しないエアバッグセンサによって前面衝突状態が検知され、その信号がエアバッグＥＣＵに入力される。エアバッグＥＣＵでは、助手席用エアバッグ装置１０を作動させるべきか否かを入力信号に基づいて判断し、「エアバッグ作動」と判断すると、インフレータ２２に所定の電流が通電される。これにより、インフレータ２２が作動してガスが発生される。このガスの供給を受けて、折り畳み状態で格納されていた助手席用エアバッグ１２が膨張し、エアバッグドア１８に作用させる内圧を上昇させ、ティアラインに沿って破断させて展開させる。その結果、助手席用エアバッグ１２は、助手席に着座する乗員Ｐ（図１参照）側へ向けて膨出展開される。助手席用エアバッグ１２が完全に展開した状態では、内側バッグ部１２Ａ及び外側バッグ部１２Ｂによって助手席に着座する乗員Ｐの両肩を中心とした部分が支持されて、前面衝突時に乗員Ｐに作用する衝撃が緩和される。また、このとき、乗員Ｐの頭部は慣性移動により乗員拘束面２８Ａに形成された凹部３６内へ入り込むことで、乗員拘束面２８Ａから受ける反力が軽減される。   When a frontal collision occurs from this state, a frontal collision state is detected by an airbag sensor (not shown), and the signal is input to the airbag ECU. The airbag ECU determines whether or not the passenger-seat airbag device 10 should be operated based on the input signal. If it is determined that the airbag is activated, a predetermined current is supplied to the inflator 22. As a result, the inflator 22 operates to generate gas. When the gas is supplied, the passenger seat airbag 12 stored in the folded state is inflated, the internal pressure applied to the airbag door 18 is increased, and the airbag 12 is broken and deployed along the tear line. As a result, the passenger seat airbag 12 is inflated and deployed toward the passenger P (see FIG. 1) sitting on the passenger seat. In the state in which the passenger seat airbag 12 is fully deployed, the inner bag portion 12A and the outer bag portion 12B support the portions around the shoulders of the occupant P seated on the passenger seat so that the occupant P is in a frontal collision. The acting shock is alleviated. At this time, the head of the occupant P enters the recess 36 formed in the occupant restraint surface 28A by inertial movement, thereby reducing the reaction force received from the occupant restraint surface 28A.

ここで、本実施形態に係る助手席用エアバッグ装置１０では、助手席用エアバッグ１２内にトラス状のストラップ３４を設けたので、シングルエアバッグでありながら、乗員拘束面２８Ａの略中央部に形成された凹部３６の両側に内側バッグ部１２Ａ及び外側バッグ部１２Ｂを形成することができる。従って、別個独立に左右のエアバッグを形成する構造に比し、構造の大幅な簡素化及びそれに伴う製造コストの削減を図ることができる。   Here, in the passenger seat airbag device 10 according to the present embodiment, the truss-shaped strap 34 is provided in the passenger seat airbag 12, so that the passenger seat restraint surface 28A is substantially at the center while being a single airbag. The inner bag portion 12 </ b> A and the outer bag portion 12 </ b> B can be formed on both sides of the recess 36 formed in the above. Therefore, as compared with the structure in which the left and right airbags are formed independently, the structure can be greatly simplified and the manufacturing cost associated therewith can be reduced.

のみならず、本実施形態では、外側傾斜ストラップ部３４Ｄの寸法Ｌ２を内側傾斜ストラップ部３４Ｅの寸法Ｌ３よりも短く設定したので、助手席に着座する乗員ＰのセンターラインＸ上に助手席用エアバッグ１２の凹部３６を位置させることができる。換言すれば、外側傾斜ストラップ部３４Ｄの寸法Ｌ２と内側傾斜ストラップ部３４Ｅの寸法Ｌ３との寸法関係を調整することにより、凹部３６の形成位置をバッグ幅方向に任意にずらすことができる。その結果、助手席用エアバッグ１２の乗員拘束面２８Ａの略中央部に形成される凹部３６の乗員Ｐの頭部に対する位置を安定化させることができ、更には車両形状に合わせてバッグ展開形状の適正化を図ることができる。   In addition, in the present embodiment, the dimension L2 of the outer inclined strap portion 34D is set to be shorter than the dimension L3 of the inner inclined strap portion 34E, so that the passenger seat air is placed on the center line X of the passenger P seated in the passenger seat. The recess 36 of the bag 12 can be positioned. In other words, by adjusting the dimensional relationship between the dimension L2 of the outer inclined strap portion 34D and the dimension L3 of the inner inclined strap portion 34E, the formation position of the recess 36 can be arbitrarily shifted in the bag width direction. As a result, it is possible to stabilize the position of the recess 36 formed in the substantially central portion of the passenger restraining surface 28A of the passenger seat airbag 12 with respect to the head of the occupant P, and further to develop the bag shape according to the vehicle shape. Can be optimized.

この点について補足すると、今仮に図１の二点鎖線で示されるようにＬ２＝Ｌ３として左右対称形状の助手席用エアバッグ５２にしたとすると、この助手席用エアバッグ５２が展開した際に、車両デザイン（フロントピラー上部５４の形状やウインドシールドガラス５６の曲面形状等）の影響を受けて当該助手席用エアバッグ５２が本来の位置よりも車室内側へ偏ることがある。この場合、当然ながら、凹部５８の位置も、助手席に着座する乗員Ｐの頭部の中心線Ｘに対して車室内側へずれてくるため、前面衝突時に乗員Ｐの頭部が乗員拘束面５２Ａから受ける反力も若干増える。しかし、本実施形態によれば、平面視でトラス状のストラップ３４の寸法設定を変更することができるので、凹部３６のバッグ幅方向の位置が乗員Ｐの頭部の中心線Ｘ上に位置するようにコントロールすることができる。その結果、車両形状に合わせて助手席用エアバッグ１２のバッグ展開形状の適正化を図ることができるのである。   If this point is supplemented, if it is assumed that L2 = L3 and the passenger seat airbag 52 has a symmetrical shape as shown by a two-dot chain line in FIG. 1, when the passenger seat airbag 52 is deployed, The passenger seat airbag 52 may be biased toward the vehicle interior side from the original position due to the influence of the vehicle design (the shape of the front pillar upper portion 54, the curved shape of the windshield glass 56, etc.). In this case, as a matter of course, the position of the recess 58 is also shifted toward the passenger compartment side with respect to the center line X of the head of the occupant P seated in the passenger seat. The reaction force received from 52A is slightly increased. However, according to the present embodiment, the dimension setting of the truss-shaped strap 34 can be changed in plan view, so that the position of the recess 36 in the bag width direction is located on the center line X of the head of the occupant P. Can be controlled. As a result, the bag deployment shape of the passenger seat airbag 12 can be optimized in accordance with the vehicle shape.

また、本実施形態に係る助手席用エアバッグ装置１０では、ストラップ３４が一本の帯状部材によって構成されているため、部品点数を最小限に抑えることができる。このため、縫製工数も最小限で済み、コストダウン効果及び重量軽減効果が得られる。   Further, in the passenger seat airbag device 10 according to the present embodiment, since the strap 34 is configured by a single belt-like member, the number of components can be minimized. For this reason, the number of sewing steps can be minimized, and a cost reduction effect and a weight reduction effect can be obtained.

〔上記実施形態の補足説明〕   [Supplementary explanation of the above embodiment]

なお、上述した本実施形態では、ストラップ３４を一本物で構成したが、これに限らず、三分割や二分割等の分割構造にしてもよい。   In addition, in this embodiment mentioned above, although the strap 34 was comprised by the one thing, you may make it not only this but division structures, such as three divisions and two divisions.

また、上述した本実施形態では、ストラップ３４と中央側基布２８、外側基布２６、内側基布２４との縫合部位である第１縫製部４４、第２縫製部４６、第３縫製部４８に、第１補強布３８、第２補強布４０、第３補強布４２をそれぞれ設定したが、これらの補強布３８、４０、４２は適宜省略可能である。   In the present embodiment described above, the first sewing portion 44, the second sewing portion 46, and the third sewing portion 48, which are stitched portions of the strap 34 and the central base fabric 28, the outer base fabric 26, and the inner base fabric 24. In addition, the first reinforcing cloth 38, the second reinforcing cloth 40, and the third reinforcing cloth 42 are set, but these reinforcing cloths 38, 40, and 42 can be omitted as appropriate.

本実施形態に係る助手席用エアバッグ装置が作動して助手席用エアバッグが膨出展開した状態を示す水平断面図である。FIG. 5 is a horizontal sectional view showing a state where the passenger seat airbag device according to the present embodiment is activated and the passenger seat airbag is inflated and deployed. 本実施形態に係る助手席用エアバッグ装置が作動して助手席用エアバッグが膨出展開した状態を示す概略斜視図である。It is a schematic perspective view which shows the state which the airbag apparatus for passenger seats which concerns on this embodiment act | operates, and the airbag for passenger seats expand | deployed. 本実施形態に係る助手席用エアバッグ装置が作動して助手席用エアバッグが膨出展開した状態の側面図である。FIG. 3 is a side view of the passenger seat airbag device according to the present embodiment in a state where the passenger seat airbag is inflated and deployed.

符号の説明Explanation of symbols

１０ 助手席用エアバッグ装置
１２ 助手席用エアバッグ
１４ インストルメントパネル
２２ インフレータ（ガス発生装置）
２４ 内側基布（エアバッグの左側面）
２６ 外側基布（エアバッグの右側面）
２８Ａ 乗員拘束面
３４ ストラップ
３４Ｄ 内側傾斜ストラップ部
３４Ｅ 外側傾斜ストラップ部
３６ 凹部 10 Airbag Device for Passenger Seat 12 Airbag for Passenger Seat 14 Instrument Panel 22 Inflator (Gas Generator)
24 Inner base fabric (left side of airbag)
26 Outer base fabric (the right side of the airbag)
28A Crew Restraint Surface 34 Strap 34D Inner Inclined Strap Part 34E Outer Inclined Strap Part 36 Concave

Claims (2)

前面衝突時に作動してガスを発生するガス発生装置と、
通常時においてはインストルメントパネルの内側に折り畳み状態で格納されると共に前面衝突時になるとガス発生装置によって発生したガスの供給を受けて助手席に着座する乗員側へ向けて膨出展開し、更に膨出方向側に位置する乗員拘束面の略中央部にバッグ高さ方向に延在する凹部が形成されたエアバッグと、
を備えた助手席用エアバッグ装置であって、
前記エアバッグの左右両側面と前記乗員拘束面とを平面視でトラス状に連結するストラップを設けた、
ことを特徴とする助手席用エアバッグ装置。 A gas generator that operates when a frontal collision occurs to generate gas;
Under normal conditions, it is stored in a folded state inside the instrument panel, and in the event of a frontal collision, it is supplied with the gas generated by the gas generator and bulges and expands toward the passenger sitting on the passenger seat. An airbag in which a recess extending in the bag height direction is formed in a substantially central portion of the passenger restraint surface located on the exit direction side;
An airbag device for a passenger seat equipped with
A strap for connecting the left and right side surfaces of the airbag and the occupant restraint surface in a truss shape in plan view is provided.
An airbag device for a passenger seat, characterized by the above. 前記ストラップは一本の帯状部材によって構成されている、
ことを特徴とする請求項１記載の助手席用エアバッグ装置。 The strap is constituted by a single band-shaped member,
The airbag device for a passenger seat according to claim 1.
JP2005244738A 2005-08-25 2005-08-25 Airbag device for passenger seat Pending JP2007055501A (en)

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