JP5148749B2 - Head airbag device - Google Patents

Head airbag device Download PDF

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JP5148749B2
JP5148749B2 JP2011511916A JP2011511916A JP5148749B2 JP 5148749 B2 JP5148749 B2 JP 5148749B2 JP 2011511916 A JP2011511916 A JP 2011511916A JP 2011511916 A JP2011511916 A JP 2011511916A JP 5148749 B2 JP5148749 B2 JP 5148749B2
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expansion chamber
head
gas
main expansion
joint
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JPWO2011090148A1 (en
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貞行 石井
和義 伴
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/232—Curtain-type airbags deploying mainly in a vertical direction from their top edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/233—Inflatable members characterised by their shape, construction or spatial configuration comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other
    • B60R2021/23316—Inner seams, e.g. creating separate compartments or used as tethering means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Description

本発明は、車両の窓部に沿って展開される頭部用エアバッグ装置に関する。   The present invention relates to a head airbag device deployed along a window portion of a vehicle.

例えば車両が側面衝突されたときなどに、車両の左右側方の窓部に沿ってカーテン状に展開される頭部用エアバッグ装置（以下、「カーテン式エアバッグ装置」とも言う。）がある。   For example, there is a head airbag device (hereinafter also referred to as a “curtain type airbag device”) that is deployed in a curtain shape along the left and right windows of the vehicle when the vehicle collides sideways. .

カーテン式エアバッグ装置は、側突事故などが発生した際、頭部などへの受傷を防止するため、乗員の頭部が窓ガラスやピラーなどに直接当接する以前に、車両室内と乗員との間で膨張室を瞬間的に膨張させることが要求される。   In order to prevent injury to the head, etc., in the event of a side collision, the curtain-type airbag device is used to prevent the passenger's head from contacting the passenger compartment and the passenger before directly contacting the window glass, pillars, etc. It is required to instantaneously expand the expansion chamber.

またカーテン式エアバッグは、膨張室に頭部が当たったときには、適度に変形して衝撃を吸収することが望まれる。特許第４０７５４６３号には、頭部が当接したときの衝撃を低減させることを目的とした頭部保護用エアバッグの発明が記載されている。   Further, it is desired that the curtain airbag is appropriately deformed to absorb an impact when the head hits the expansion chamber. Japanese Patent No. 4075463 describes an invention of a head protecting airbag aimed at reducing impact when the head abuts.

またカーテン式エアバッグは、車両が横転などして窓ガラスが破損した場合に、乗員が車外に放出されないように保持する機能も備えている。横転時などに乗員が車外に放出されることを防止する観点からは、カーテン式エアバッグは、車両側方の窓ガラス全体を覆う十分な広さと、膨張した状態を衝突後もしばらく保持する必要がある。   The curtain airbag also has a function of holding the occupant from being released outside the vehicle when the vehicle rolls over and the window glass is damaged. From the viewpoint of preventing occupants from being released outside the vehicle during a rollover, the curtain airbag must be sufficiently wide to cover the entire window glass on the side of the vehicle and maintain the inflated state for a while after the collision. There is.

これら求められる機能からカーテン式エアバッグ装置では、短時間に多量のガスを発生させてそのガスを膨張室に供給し、かつ供給したガスを膨張室内に所定時間保持させておくように構成されている。   Because of these required functions, the curtain airbag apparatus is configured to generate a large amount of gas in a short time, supply the gas to the expansion chamber, and hold the supplied gas in the expansion chamber for a predetermined time. Yes.

特許第４０７５４６３号明細書Patent No. 4075463

しかしながらカーテン式エアバッグは、膨張室を膨張させた時、膨張室が急激に膨張して頭部などに当たり、過大な衝撃力が頭部に加えられないような機能も必要とされている。カーテン式エアバッグが、その膨張作用により頭部などに重大な損傷を与えないことを防止する観点からは、ガスの発生速度を緩慢にし、エアバッグの膨張速度を緩やかにさせる必要があり、上記各種要件と相反する要件を満足させる必要がある。   However, the curtain airbag is also required to have a function such that when the expansion chamber is inflated, the expansion chamber suddenly expands and hits the head, and an excessive impact force is not applied to the head. From the viewpoint of preventing the curtain-type airbag from seriously damaging the head or the like due to its inflating action, it is necessary to slow down the gas generation rate and slow down the inflation rate of the airbag. It is necessary to satisfy requirements that conflict with various requirements.

また上記発明にかかる頭部保護用エアバッグは、内圧コントロールチャンバを具え、頭部が当たることにより上昇した圧力で接着箇所を破断させてクッション室のガスを内圧コントロールチャンバに逃がし、頭部が衝突した際の衝撃を低減させるものと思量される。かかる頭部保護用エアバッグは、エアバッグの後方に設けられた導入口からガスを導入させてクッション室を展開させることから、多量のガスを急速に導入させているものと思量され、急激な膨張を低減させるという観点は見られない。   Further, the head protection airbag according to the invention includes an internal pressure control chamber, the bonded portion is broken by the pressure increased by hitting the head and the gas in the cushion chamber is released to the internal pressure control chamber, and the head collides. It is thought that it reduces the impact when it is done. Such a head protecting airbag is considered to be introducing a large amount of gas rapidly because gas is introduced from an inlet provided at the rear of the airbag and the cushion chamber is deployed. There is no view of reducing expansion.

本願発明は、上記課題を解決し、短時間で膨張室を膨張させて事故発生による衝撃から頭部を確実に保護するとともに、乗員を車室内に保持でき、かつ膨張時に過大な衝撃力が頭部に加えられることがない頭部用エアバッグを提供することを目的とする。   The invention of the present application solves the above problems, inflates the expansion chamber in a short time and reliably protects the head from the impact caused by the occurrence of an accident, holds the occupant in the passenger compartment, and excessive impact force during expansion An object is to provide a head airbag that is not added to the head.

本発明は、上記の課題を解決するため、頭部用エアバッグ装置を次のように構成した。
ガス発生器で発生したガスにより車両の窓部に沿って展開される、前記車両の少なくとも前席に対応した前席用膨張室、及び、前記車両の後席に対応した後席用膨張室を有する頭部用エアバッグと、前記前席用膨張室の内面どうしを後部上方から前部斜め下方に向かって直線状に接合することにより前記前席用膨張室を主膨張室と前記主膨張室の後下方に位置する副膨張室とに区画する第一接合部と、前記第一接合部の長手方向中間部を不連続にすることにより形成され、前記ガス発生器により前記主膨張室が膨張しているとき、所定の力で前記主膨張室と前記副膨張室との連通を閉鎖させる開口部と、を備え、前記ガス発生器からのガスが前記頭部用エアバッグに流入するガス流入口が前記前席用膨張室と前記後席用膨張室との間に設けられ、前記主膨張室は後部上方から前部斜め下方に沿って筒状に膨張するよう形成されているとともに、前記後席用膨張室よりも容積が小さく設定され、前記ガス発生器から前記主膨張室へ供給されるガスの噴出方向が前記主膨張室の長手方向に沿って設定され、かつ、前記開口部は前記主膨張室が膨張したあと、前記開口部を通って前記副膨張室が膨張するよう形成され、前記副膨張室は前記前席に着座した乗員の頭部より下方に位置すると想定される箇所に設定されているとともに、乗員とともに前記前席のシートバックを覆うようにほぼ三角形状に形成されている構成とした。 In order to solve the above-described problems, the present invention is configured as follows.
A front seat expansion chamber corresponding to at least a front seat of the vehicle, and a rear seat expansion chamber corresponding to a rear seat of the vehicle, which are deployed along a window portion of the vehicle by gas generated by a gas generator ; A head airbag having a front airbag and an inner surface of the front seat expansion chamber are joined in a straight line from the rear upper side to the front diagonally lower side, thereby connecting the front seat expansion chamber to the main expansion chamber and the main expansion chamber. The main expansion chamber is formed by making the first joint section partitioned into a sub-expansion chamber located below and the longitudinal intermediate portion of the first joint discontinuous, and the main expansion chamber is expanded by the gas generator. An opening that closes the communication between the main expansion chamber and the sub-expansion chamber with a predetermined force, and the gas flow from which the gas from the gas generator flows into the head airbag An entrance is provided between the front seat expansion chamber and the rear seat expansion chamber. Said main expansion chamber with is formed so as to expand from the upper rear in a cylindrical shape along the front obliquely downwards, volume than the rear-seat inflation chamber is set smaller, the main expanding from the gas generator The ejection direction of the gas supplied to the chamber is set along the longitudinal direction of the main expansion chamber, and the opening expands the sub expansion chamber through the opening after the main expansion chamber expands. The sub-expansion chamber is set at a position assumed to be located below the head of the occupant seated in the front seat and is substantially triangular so as to cover the seat back of the front seat together with the occupant. It was set as the structure currently formed in the shape .

頭部用エアバッグは、ほとんど通気性を有さない、２枚の布部材から形成されている。２枚の布部材には、内面どうしを接合する線状の接合部が設けられ、接合部により２枚の布部材の間に膨張室が区画形成されている。   The head airbag is formed of two cloth members that have little air permeability. The two cloth members are provided with linear joint portions for joining the inner surfaces, and an expansion chamber is defined between the two cloth members by the joint portions.

頭部用エアバッグは、通常時天井部やピラーなどに収納されており、内部にガスを供給することにより、車両の左右側方に設けられた窓に沿って車室内側に膨張室が展開される。頭部用エアバッグには、少なくとも車両の前席に着座している乗員を保護する前席用膨張室が設けられている。後部には、後席に着座している乗員を保護する後席用膨張室が設けられている。   The airbag for the head is normally stored in the ceiling, pillar, etc., and by supplying gas to the interior, the expansion chamber is deployed on the vehicle interior side along the windows provided on the left and right sides of the vehicle Is done. The head airbag is provided with a front seat expansion chamber that protects at least a passenger seated in the front seat of the vehicle. A rear seat expansion chamber is provided at the rear portion for protecting a passenger seated in the rear seat.

前席用膨張室は、上下方向には、天井部から窓の下端付近までの範囲で、前後方向には、Ａピラーから前席シートバックの後端までの範囲に形成されているものとする。後席用膨張室としては、上下方向には、天井部から窓の下端付近までであり、前後方向には、後席に着座している乗員の頭部を中心として適度な範囲に形成されているのが好ましい。ガス発生器は、頭部用エアバッグの上部から、少なくとも前席用膨張室にガスを直接供給するように頭部用エアバッグに接続している。   The front seat expansion chamber is formed in the range from the ceiling to the vicinity of the lower end of the window in the vertical direction, and in the range from the A pillar to the rear end of the front seat back in the front-rear direction. . The expansion chamber for the rear seat is from the ceiling to the vicinity of the lower end of the window in the vertical direction, and is formed in an appropriate range around the head of the passenger seated in the rear seat in the front-rear direction. It is preferable. The gas generator is connected to the head airbag so as to supply gas directly to at least the front seat expansion chamber from the top of the head airbag.

更に前席用膨張室には、第一接合部が、前席の後方と天井部との交差する付近から前方斜め下方に向けて設けられている。第一接合部により、前席用膨張室には、第一接合部の前方に主膨張室が、第一接合部の後方に副膨張室に区画形成されている。主膨張室は、第一接合部に沿ってほぼ長方形に形成されている。また第一接合部は、不連続部分を有し、不連続部分により主膨張室と副膨張室とを連通させる開口部が形成されている。   Further, in the front seat expansion chamber, a first joint portion is provided obliquely downward and forward from the vicinity where the rear of the front seat intersects the ceiling. Due to the first joint portion, a main expansion chamber is defined in the front seat expansion chamber in front of the first joint portion and a sub-expansion chamber in the rear of the first joint portion. The main expansion chamber is formed in a substantially rectangular shape along the first joint portion. In addition, the first joint has a discontinuous portion, and an opening for communicating the main expansion chamber and the sub-expansion chamber is formed by the discontinuous portion.

ガス発生器は、少なくとも主膨張室に向けて開口した噴出口を具えている。主膨張室は、ガス発生器からのガスの供給により、第一接合部に沿ってほぼ筒状に膨張する。副膨張室は、閉鎖空間に形成されており、開口部でのみ主膨張室と連通している。また主膨張室と副膨張室とを連通している開口部は、主膨張室が膨張すると、その膨張圧力により作用した第一接合部の長手方向の引っ張り力により所定の力で閉鎖される。   The gas generator includes a jet port that opens at least toward the main expansion chamber. The main expansion chamber expands in a substantially cylindrical shape along the first joint portion by the supply of gas from the gas generator. The secondary expansion chamber is formed in a closed space and communicates with the main expansion chamber only at the opening. In addition, when the main expansion chamber expands, the opening that communicates the main expansion chamber and the sub-expansion chamber is closed with a predetermined force by the tensile force in the longitudinal direction of the first joint that is acted on by the expansion pressure.

本発明にかかる頭部用エアバッグ装置は、事故などによりガス発生器からガスが噴出されると、主膨張室に直接ガスが供給される。主膨張室が膨張することにより開口部は閉鎖された状態となるので、主膨張室がまず膨張し、頭部などが窓ガラスなどに当接することを防止できる。   In the head airbag device according to the present invention, when gas is ejected from the gas generator due to an accident or the like, the gas is directly supplied to the main expansion chamber. Since the opening is closed by the expansion of the main expansion chamber, it is possible to prevent the main expansion chamber from expanding first and the head or the like from coming into contact with the window glass or the like.

更に主膨張室は容積が小さく、膨張に要するガス量が少ないので、ガス発生器でガスを急激に発生させる必要がなく、主膨張室の圧力上昇を適度に抑制して衝撃吸収可能な硬度とし、頭部が当接した際の衝撃を緩和できる。しかも、主膨張室が急激に膨張されないので、主膨張室が膨張する際に、頭部に打撃を与えることがない。   Furthermore, since the main expansion chamber has a small volume and requires a small amount of gas for expansion, there is no need to generate gas suddenly with a gas generator, and the hardness of the main expansion chamber can be moderately suppressed by increasing the pressure in the main expansion chamber. The impact when the head comes into contact can be reduced. Moreover, since the main expansion chamber is not expanded rapidly, the head is not hit when the main expansion chamber expands.

更に主膨張室が十分に膨張した後、続けて主膨張室にガスが供給されて内圧が上昇すると、開口部を通ってガスが副膨張室に流入する。これにより、副膨張室も膨張し、エアバッグ全体に膨張室が展開され、乗員が車外へ放出されることを防止できる。副膨張室へのガスの流入が、接着箇所の破断などを伴うことなく行われ、構造が簡略化でき、作動の安定性と組み立てコストの低減が得られる。開口部が、前後および上下にずれているので、開閉を確実に行わせることができる。   Further, after the main expansion chamber is sufficiently expanded, when gas is continuously supplied to the main expansion chamber and the internal pressure rises, the gas flows into the sub expansion chamber through the opening. As a result, the sub-inflation chamber is also inflated, the expansion chamber is deployed in the entire airbag, and the occupant can be prevented from being released out of the vehicle. The inflow of gas into the sub-expansion chamber is performed without causing breakage of the bonded portion, so that the structure can be simplified, and the operation stability and the assembly cost can be reduced. Since the opening is displaced forward and backward and up and down, the opening and closing can be performed reliably.

図１は、本発明にかかる頭部用エアバッグの一実施形態を示す正面図である。FIG. 1 is a front view showing an embodiment of a head airbag according to the present invention. 図２は、本発明にかかる頭部用エアバッグ装置の一実施形態を示す正面図である。FIG. 2 is a front view showing an embodiment of a head airbag device according to the present invention. 図３は、頭部用エアバッグの膨張室を示す断面図である。FIG. 3 is a cross-sectional view showing an expansion chamber of the head airbag. 図４は、頭部用エアバッグの膨張室を示す断面図である。FIG. 4 is a cross-sectional view showing an expansion chamber of the head airbag.

本発明にかかる頭部用エアバッグ装置の一実施形態について説明する。
図２に、車両用の頭部用エアバッグ装置１０を示す。頭部用エアバッグ装置１０は、頭部用エアバッグ１２と、ガス発生器１４と、衝撃感知装置１６と、制御装置１８などから構成されている。頭部用エアバッグ１２とガス発生器１４は、制御装置１８などを共通にして車両（図示せず。）の左右両側にそれぞれ設けられている。左右の頭部用エアバッグ１２などは左右対称に構成されているので、他方の説明は省略する。以下、一方の頭部用エアバッグ装置１０について、車両の前進方向を前方とし、それを基準に左右を定め、重力の方向を下方として説明する。An embodiment of a head airbag device according to the present invention will be described.
FIG. 2 shows a head airbag device 10 for a vehicle. The head airbag device 10 includes a head airbag 12, a gas generator 14, an impact sensing device 16, a control device 18, and the like. The head airbag 12 and the gas generator 14 are provided on both the left and right sides of a vehicle (not shown) with a common control device 18 and the like. Since the left and right head airbags 12 and the like are configured symmetrically, the other description is omitted. Hereinafter, the airbag device 10 for one head will be described assuming that the forward direction of the vehicle is the front, the left and right are determined based on the forward direction, and the direction of gravity is the downward direction.

衝撃感知装置１６は、車両の所定位置に取り付けられており、事故発生時の衝撃を感知すると、その信号を制御装置１８に送信する。制御装置１８は、衝撃感知装置１６から検出結果を受けると、記憶されている閾値と比較し、閾値を超えるとエアバッグ装置の作動を決定する。   The impact sensing device 16 is attached to a predetermined position of the vehicle, and transmits a signal to the control device 18 when sensing an impact when an accident occurs. When the detection result is received from the impact sensing device 16, the control device 18 compares it with the stored threshold value, and determines the operation of the airbag device when the threshold value is exceeded.

ガス発生器１４は、車両の天井部７０の近傍に設けられており、制御装置１８から作動信号を受けると、可燃性材料を燃焼させて多量のガスを発生させ、または圧縮ガスを放出させる（手段は特に問わない。）。ガス発生器１４は、前方にガス噴出部２４を具えている。ガス噴出部２４は、後述する頭部用エアバッグ１２のガス流入口３８に連結しており、少なくとも車両と後方に向けて開口する噴出口（図示せず。）を有している。   The gas generator 14 is provided in the vicinity of the ceiling 70 of the vehicle, and upon receiving an operation signal from the control device 18, the combustible material is burned to generate a large amount of gas or to release compressed gas ( The means is not particularly limited.) The gas generator 14 includes a gas ejection part 24 in the front. The gas ejection part 24 is connected to a gas inlet 38 of the head airbag 12 described later, and has at least a vehicle and an outlet (not shown) that opens rearward.

頭部用エアバッグ１２は、ほとんど通気性がない２枚の布部材２６（図３参照。）を重ね合わせて形成されている。頭部用エアバッグ１２は、展開した状態では、車両側方に設けられた窓部（図示せず。荷室部分の窓部を除く。）の全体をほとんど覆う形状に形成されている。   The head airbag 12 is formed by superposing two cloth members 26 (see FIG. 3) that are hardly air permeable. In the deployed state, the head airbag 12 is formed in a shape that almost covers the entire window (not shown; except for the cargo compartment window) provided on the side of the vehicle.

頭部用エアバッグ１２は、その前部は、Ａピラー７２の上半部に取り付けてあり、上部は、車両室内の天井部７０の左右側方のいずれかの端縁に沿って取り付けられ、後部は、後席後部に配置されたＣピラー（図示せず。）の近傍に取り付けられている。通常、頭部用エアバッグ１２は折り畳まれ、Ａピラー７２や天井部７０の端縁内側などに収納されている。   The front portion of the head airbag 12 is attached to the upper half of the A pillar 72, and the upper portion is attached along one of the left and right edges of the ceiling 70 in the vehicle compartment. The rear part is attached in the vicinity of a C pillar (not shown) disposed in the rear part of the rear seat. Usually, the head airbag 12 is folded and stored inside the edge of the A pillar 72 or the ceiling 70.

２枚の布部材２６の間には、図１に示すように、布部材２６の内面どうしを接合させる接合部３２が線状に設けられている。接合部３２の接合方法は、縫製、接着剤、加熱溶融など手段は特に問わない。接合部３２を点線で示す。接合部３２は基本的に連続して設けてあり、接合部３２により頭部用エアバッグ１２に膨張室が形成される。   As shown in FIG. 1, a joint portion 32 that joins the inner surfaces of the cloth member 26 is linearly provided between the two cloth members 26. The joining method of the joining part 32 is not particularly limited by means such as sewing, an adhesive, and heat melting. The joint portion 32 is indicated by a dotted line. The joint portion 32 is basically provided continuously, and the joint portion 32 forms an expansion chamber in the head airbag 12.

次に、接合部３２について具体的に説明する。   Next, the junction part 32 is demonstrated concretely.

接合部３２は、頭部用エアバッグ１２の前方上部近傍から、頭部用エアバッグ１２の上縁に沿って設けられた上部接合部３４と、上部接合部３４の前端に連結し、上部接合部３４の下方を通って上部接合部３４の後部で再び上部接合部３４に連結する下部接合部３６から構成されている。   The joint portion 32 is connected to the upper joint portion 34 provided along the upper edge of the head airbag 12 and the front end of the upper joint portion 34 from the vicinity of the front upper portion of the head airbag 12, and is joined to the upper joint. The lower joint 36 is connected to the upper joint 34 again at the rear of the upper joint 34 through the lower portion 34.

上部接合部３４は、ほぼ中央に不連続部分を有し、この不連続部分がガス流入口３８となっている。上述したようにガス流入口３８には、ガス発生器１４のガス噴出部２４が気密に取り付けられる。   The upper joint portion 34 has a discontinuous portion at substantially the center, and the discontinuous portion serves as a gas inlet 38. As described above, the gas ejection portion 24 of the gas generator 14 is attached to the gas inlet 38 in an airtight manner.

下部接合部３６は、頭部用エアバッグ１２の前方上部近傍から下方に向かい、下端から後方に延びている。後方に延びた下部接合部３６は、前席に対応する部分を通過した後、上方に向かい、再び下方に移動する。そして下部接合部３６は、下端から再び後方に移動し、後席に対応する部分を通過した後、上方に移動し、上部接合部３４の後端に連結している。   The lower joint portion 36 extends downward from the vicinity of the front upper portion of the head airbag 12 and extends rearward from the lower end. The lower joint 36 extending rearward passes through a portion corresponding to the front seat, then moves upward and then moves downward again. The lower joint portion 36 moves backward again from the lower end, passes through a portion corresponding to the rear seat, moves upward, and is connected to the rear end of the upper joint portion 34.

上部接合部３４と下部接合部３６により、頭部用エアバッグ１２の前方に前席用膨張室４０が、後方に後席用膨張室４２が形成される。前席用膨張室４０は、車両の前席に着座した乗員に対応し、後席用膨張室４２は、車両の後席に着座した乗員に対応している。   The upper joint 34 and the lower joint 36 form a front seat expansion chamber 40 in front of the head airbag 12 and a rear seat expansion chamber 42 in the rear. The front seat expansion chamber 40 corresponds to a passenger seated in the front seat of the vehicle, and the rear seat expansion chamber 42 corresponds to a passenger seated in the rear seat of the vehicle.

更に前席用膨張室４０には、第一接合部４４と、第二接合部４６が設けられている。第一接合部４４は、下部接合部３６の中央部分に形成された上縁（ガス流入口３８に対向する位置）から、前下がりに、下部接合部３６を斜めに区画するように直線状に設けられている。第二接合部４６は、第一接合部４４の前方に、第一接合部４４とほぼ平行に設けられている。第一接合部４４、第二接合部４６、上部接合部３４、および下部接合部３６により、主膨張室５０が形成される。主膨張室５０は、主に車両の前席に着座した乗員の頭部が位置すると想定される箇所に設定される。また第一接合部４４と下部接合部３６との間に、副膨張室５２が形成される。副膨張室５２は、主に車両の前席に着座した乗員の頭部より下方に位置すると想定される箇所に設定され、本実施形態ではほぼ三角形状に形成されている。   Further, the front seat expansion chamber 40 is provided with a first joint portion 44 and a second joint portion 46. The first joint portion 44 is linearly formed so as to divide the lower joint portion 36 obliquely from the upper edge (position facing the gas inlet 38) formed in the central portion of the lower joint portion 36 toward the front. Is provided. The second joint 46 is provided in front of the first joint 44 and substantially parallel to the first joint 44. The first expansion portion 50 is formed by the first bonding portion 44, the second bonding portion 46, the upper bonding portion 34, and the lower bonding portion 36. The main expansion chamber 50 is set at a position where the head of an occupant seated mainly in the front seat of the vehicle is supposed to be located. A sub-expansion chamber 52 is formed between the first joint portion 44 and the lower joint portion 36. The sub-expansion chamber 52 is set at a location assumed to be located below the head of an occupant seated mainly in the front seat of the vehicle, and is formed in a substantially triangular shape in this embodiment.

また第一接合部４４には、開口部５４が設けられている。開口部５４は、直線状に連続する第一接合部４４の一部を不連続にして形成されている。開口部５４は、所定の長さを有し、主膨張室５０と副膨張室５２の間を連通させている。開口部５４の両側、つまり不連続部分の端部には、円形に形成された補強部５６が設けられている。開口部５４は、主膨張室５０がガス発生器１４からのガスにより膨張して、布部材２６に引っ張り力が作用すると、それにより適度な力で閉鎖し、ガスの流通を制限するように形成されている。   The first joint portion 44 is provided with an opening 54. The opening 54 is formed by discontinuating a part of the first joining portion 44 that is linearly continuous. The opening 54 has a predetermined length and communicates between the main expansion chamber 50 and the sub expansion chamber 52. Reinforcing portions 56 formed in a circular shape are provided on both sides of the opening 54, that is, on the end of the discontinuous portion. The opening 54 is formed so that when the main expansion chamber 50 is expanded by the gas from the gas generator 14 and a tensile force is applied to the cloth member 26, it is closed with an appropriate force and restricts the gas flow. Has been.

ガス発生器１４のガス噴出部２４には、前席用膨張室４０と後席用膨張室４２に向けてそれぞれ開口した噴出口が設けられている。更に、前席用膨張室４０に向いた噴出口は、主膨張室５０の長手方向とほぼ平行な方向に開口されており、ガス発生器１４から主膨張室５０へ供給されるガスが、主膨張室５０の長手方向に沿って噴出されるよう設定されていることが好ましい。また前席用膨張室４０に向けて開口した噴出口は、後席用膨張室４２に向けて開口した噴出口より時間当たりのガス噴射量が少なくなるように形成されている。   The gas ejection part 24 of the gas generator 14 is provided with a jet opening that opens toward the front seat expansion chamber 40 and the rear seat expansion chamber 42. Further, the jet outlet facing the expansion chamber 40 for the front seat is opened in a direction substantially parallel to the longitudinal direction of the main expansion chamber 50, and the gas supplied from the gas generator 14 to the main expansion chamber 50 is the main outlet. It is preferable to set so as to be ejected along the longitudinal direction of the expansion chamber 50. The jet opening that opens toward the front seat expansion chamber 40 is formed so that the amount of gas injection per hour is smaller than the jet opening that opens toward the rear seat expansion chamber 42.

次に、頭部用エアバッグ装置１０の作用、および効果について説明する。   Next, functions and effects of the head airbag device 10 will be described.

通常、頭部用エアバッグ装置１０は、Ａピラー７２などの内部に頭部用エアバッグ１２が収納されており、万一事故が発生し、衝撃を衝撃感知装置１６が感知すると、制御装置１８を介してガス発生器１４が作動する。   Normally, the head airbag device 10 has the head airbag 12 housed inside the A-pillar 72 and the like, and if an accident occurs and the impact sensing device 16 senses an impact, the control device 18 The gas generator 14 is operated via

ガス発生器１４が作動してガスが発生すると、ガス噴出部２４の噴出口から頭部用エアバッグ１２の前方と後方のそれぞれに向けてガスが噴射される。   When the gas generator 14 is activated to generate gas, the gas is jetted from the jet port of the gas jetting portion 24 toward the front and rear of the head airbag 12.

後方に噴射されたガスは、後席用膨張室４２を膨張させる。前方に噴射されたガスは、主膨張室５０に流入し、主膨張室５０を膨張させる。前方に向けたガスは、ほぼ長方形状の主膨張室５０の長手方向に沿って噴射されることから、主膨張室５０が直ちに筒状に膨張する。また、前方に向けて噴射されるガスの時間当たりの噴射量が、後方に向けて噴射されるガスの噴射量より少ないが、主膨張室５０は、後席用膨張室４２より容積が小さいため、後席用膨張室４２と同時か、それより早く十分に膨張される。   The gas injected rearward causes the rear seat expansion chamber 42 to expand. The gas injected forward flows into the main expansion chamber 50 and expands the main expansion chamber 50. Since the gas directed forward is injected along the longitudinal direction of the substantially rectangular main expansion chamber 50, the main expansion chamber 50 immediately expands into a cylindrical shape. Moreover, although the injection amount per hour of the gas injected toward the front is smaller than the injection amount of the gas injected toward the rear, the main expansion chamber 50 has a smaller volume than the rear seat expansion chamber 42. It is fully expanded at the same time as the rear seat expansion chamber 42 or earlier.

更に、主膨張室５０が膨張しているときは、所定の力で開口部５４が閉鎖されており、主膨張室５０から副膨張室５２にガスが流入しない。かかる状態を、図３に示す。図３は、図１のＦ３−Ｆ３断面であり、同図に示すように、主膨張室５０が膨張し、副膨張室５２は平板な状態となっている。   Further, when the main expansion chamber 50 is inflated, the opening 54 is closed with a predetermined force, and no gas flows from the main expansion chamber 50 into the sub-expansion chamber 52. Such a state is shown in FIG. FIG. 3 is a cross-sectional view taken along line F3-F3 of FIG. 1. As shown in FIG. 3, the main expansion chamber 50 is inflated and the sub-expansion chamber 52 is flat.

そして、主膨張室５０が十分に膨張し、更にガスが流入して主膨張室５０の内部圧力が高まると開口部５４が押し広げられ、主膨張室５０からガスが副膨張室５２に流入する。これにより、図４に示すように、主膨張室５０、および副膨張室５２が膨張し、前席用膨張室４０の全体が膨張した状態となる。   When the main expansion chamber 50 is sufficiently expanded and further gas flows in to increase the internal pressure of the main expansion chamber 50, the opening 54 is expanded and the gas flows from the main expansion chamber 50 into the sub expansion chamber 52. . As a result, as shown in FIG. 4, the main expansion chamber 50 and the sub expansion chamber 52 expand, and the entire front seat expansion chamber 40 expands.

したがって頭部用エアバッグ装置１０によれば、事故発生時、主膨張室５０には適度な流入速度（エアバッグの機能を果たす上で充分な程度に直ちに膨張する流入速度）でガスが流入されるので、主膨張室５０が急激に膨張することがなく、頭部への打撃を回避できる。また主膨張室５０は、容積が小さいので、かかるガスの供給速度であっても、乗員の頭部が窓ガラスなどに直接当接する以前に確実に膨張され、頭部への損傷を回避できる。   Therefore, according to the head airbag device 10, when an accident occurs, gas flows into the main expansion chamber 50 at an appropriate inflow rate (an inflow rate that expands immediately enough to fulfill the function of the airbag). As a result, the main expansion chamber 50 does not expand rapidly, and hitting the head can be avoided. Moreover, since the main expansion chamber 50 has a small volume, even at such a gas supply rate, the main expansion chamber 50 is reliably expanded before the passenger's head directly comes into contact with the window glass or the like, and damage to the head can be avoided.

更に、主膨張室５０が膨張を保持した状態で、主膨張室５０から副膨張室５２へ開口部５４を通ってガスが流入するので、前席用膨張室４０の全体、および後席用膨張室４２が膨張し、頭部用エアバッグ１２の全体が展開される。これにより、窓部全体が頭部用エアバッグ１２に覆われ、乗員が窓部から車外に放出されることがない。   Further, since the gas flows from the main expansion chamber 50 to the sub-expansion chamber 52 through the opening 54 in a state where the main expansion chamber 50 maintains expansion, the entire front seat expansion chamber 40 and the rear seat expansion are provided. The chamber 42 is inflated, and the entire head airbag 12 is deployed. Thereby, the whole window part is covered with the airbag 12 for heads, and a passenger | crew is not discharge | released outside a vehicle from a window part.

開口部５４は、線状に延びる第一接合部４４の一部を不連続にして形成され、しかも破断可能な接着部分を必要としないので、構成が簡易で、コストを低減できる。開口部５４は、斜めに形成されるので、確実に開放され、しかも接着部分の破断などを伴わないので、安定した作動が得られる。   The opening 54 is formed by discontinuously forming a part of the first joint portion 44 extending linearly, and does not require a breakable adhesive portion, so that the configuration is simple and the cost can be reduced. Since the opening 54 is formed obliquely, the opening 54 is surely opened and is not accompanied by breakage of the bonded portion, so that a stable operation can be obtained.

尚本発明では、開口部５４は、第一接合部４４の中央でなくともよい。例えば、第一接合部４４の上端や下端近傍に設けてもよい。第二接合部４６は、主膨張室５０が膨張して所定の形状に形成された際、開口部５４が閉鎖される方向に付勢されれば、上記位置や形状に限定されるものではなく、また上部接合部３４などにより代替できれば、第二接合部４６を設けなくともよい。更に、副膨張室５２の形状は、上記例に限るものではない。   In the present invention, the opening 54 may not be the center of the first joint 44. For example, you may provide in the upper end of the 1st junction part 44, or lower end vicinity. The second joint portion 46 is not limited to the above position and shape as long as the main expansion chamber 50 is expanded and formed into a predetermined shape and is biased in the direction in which the opening 54 is closed. If the upper joint 34 can be substituted, the second joint 46 need not be provided. Further, the shape of the sub-expansion chamber 52 is not limited to the above example.

本発明は、車両の左右側方に設けられた窓部に沿ってカーテン状に展開される頭部用エアバッグに用いることができる。
以下に、本願出願の当初の特許請求の範囲に記載された発明を付記する。
［１］ガス発生器で発生したガスにより車両の窓部に沿って展開される、前記車両の少なくとも前席に対応した前席用膨張室を有する頭部用エアバッグと、
前記前席用膨張室の後部上方から前部斜め下方に延びて、該前席用膨張室を主膨張室と副膨張室とに区画する第一接合部と、
前記ガス発生器により前記主膨張室が膨張したとき、所定の力で前記主膨張室と前記副膨張室との連通を閉鎖させる開口部と、
から構成されることを特徴とした頭部用エアバッグ装置。
［２］前記主膨張室は、前記前席膨張室の後部上方から前部斜め下方に沿って筒状に膨張するよう形成されており、
前記ガス発生器から前記主膨張室へ供給されるガスの噴出方向が、前記主膨張室の長手方向に沿って設定されている
ことを特徴とした［１］に記載の頭部用エアバッグ装置。
［３］前記第一接合部は、前記前席用膨張室の内面どうしを線状に接合したものであり、
前記開口部は、前記第一接合部の一部を不連続にして形成されている
ことを特徴とした［１］又は［２］に記載の頭部用エアバッグ装置。
［４］前記第一接合部よりも前記主膨張室側にて前記第一接合部とほぼ平行に延びる第二接合部を具え、
前記主膨張室は、前記第一接合部と前記第二接合部との間で筒状に膨張するよう形成されている
ことを特徴とした［１］〜［３］のいずれか１項に記載の頭部用エアバッグ装置。
［５］前記主膨張室は、前記車両の前席に着座する乗員の頭部が位置すると想定される箇所に対応して形成されている
ことを特徴とした［１］〜［４］のいずれか１項に記載の頭部用エアバッグ装置。
［６］前記副膨張室は、閉鎖空間に形成されており、前記開口部でのみ前記主膨張室と連通している
ことを特徴とした［１］〜［５］のいずれか１項に記載の頭部用エアバッグ装置。
［７］前記頭部用エアバッグは、前記車両の後席に対応した後席用膨張室を具え、
前記ガス発生器からのガスが前記頭部用エアバッグに流入するガス流入口が前記前席用膨張室と前記後席用膨張室との間に設けられている
ことを特徴とした［１］〜［６］のいずれか１項に記載の頭部用エアバッグ装置。
［８］前記ガス発生器のガス噴出部は、前記頭部用エアバッグの前記ガス流入口に連結され、前記車両の前方及び後方のそれぞれに向けて開口する噴出口を具える
ことを特徴とした［７］に記載の頭部用エアバッグ装置。
［９］前記主膨張室は、前記後席用膨張室よりも容積が小さく設定されている
ことを特徴とした［７］又は［８］に記載の頭部用エアバッグ装置。
［１０］前記ガス発生器のガス噴出量は、前記車両の後方に向けて噴出する量よりも前方に向けて噴出する量の方が少なく設定されている
ことを特徴とした［７］〜［９］のいずれか１項に記載の頭部用エアバッグ装置。 INDUSTRIAL APPLICABILITY The present invention can be used for a head airbag that is deployed in a curtain shape along windows provided on the left and right sides of a vehicle.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] A head airbag having a front seat expansion chamber corresponding to at least a front seat of the vehicle, which is deployed along a window portion of the vehicle by gas generated by a gas generator;
A first joint that extends from the rear upper part of the front seat expansion chamber obliquely downward to the front and divides the front seat expansion chamber into a main expansion chamber and a sub-expansion chamber;
An opening that closes communication between the main expansion chamber and the sub-expansion chamber with a predetermined force when the main expansion chamber is expanded by the gas generator;
An airbag device for a head, comprising:
[2] The main expansion chamber is formed so as to expand in a cylindrical shape from the rear upper part of the front seat expansion chamber to the front obliquely lower part,
The ejection direction of the gas supplied from the gas generator to the main expansion chamber is set along the longitudinal direction of the main expansion chamber.
The head airbag device according to [1], which is characterized in that.
[3] The first joint portion is obtained by joining the inner surfaces of the front seat expansion chamber in a linear shape,
The opening is formed by discontinuous part of the first joint.
The airbag apparatus for heads as described in [1] or [2] characterized by the above-mentioned.
[4] A second joint extending substantially parallel to the first joint on the main expansion chamber side than the first joint is provided.
The main expansion chamber is formed to expand in a cylindrical shape between the first joint and the second joint.
The head airbag device according to any one of [1] to [3].
[5] The main expansion chamber is formed corresponding to a position where the head of an occupant seated in the front seat of the vehicle is assumed to be located.
The head airbag device according to any one of [1] to [4].
[6] The sub expansion chamber is formed in a closed space and communicates with the main expansion chamber only at the opening.
The head airbag device according to any one of [1] to [5].
[7] The head airbag includes a rear seat expansion chamber corresponding to the rear seat of the vehicle,
A gas inlet through which gas from the gas generator flows into the head airbag is provided between the front seat expansion chamber and the rear seat expansion chamber.
The head airbag device according to any one of [1] to [6].
[8] A gas ejection portion of the gas generator includes an ejection port that is connected to the gas inlet of the head airbag and opens toward the front and rear of the vehicle.
The head airbag device according to [7], which is characterized in that.
[9] The main expansion chamber is set to be smaller in volume than the rear seat expansion chamber.
The airbag apparatus for heads as described in [7] or [8] characterized by the above-mentioned.
[10] The gas ejection amount of the gas generator is set to be smaller in the amount ejected forward than the amount ejected toward the rear of the vehicle.
The airbag device for a head according to any one of [7] to [9], wherein

１０…頭部用エアバッグ装置
１２…頭部用エアバッグ
１４…ガス発生器
３２…接合部
３４…上部接合部
３６…下部接合部
４０…前席用膨張室
４４…第一接合部
５０…主膨張室
５２…副膨張室
５４…開口部DESCRIPTION OF SYMBOLS 10 ... Head airbag apparatus 12 ... Head airbag 14 ... Gas generator 32 ... Joint part 34 ... Upper junction part 36 ... Lower junction part 40 ... Front seat expansion chamber 44 ... First junction part 50 ... Main Expansion chamber 52 ... Sub expansion chamber 54 ... Opening

Claims (6)

ガス発生器で発生したガスにより車両の窓部に沿って展開される、前記車両の少なくとも前席に対応した前席用膨張室、及び、前記車両の後席に対応した後席用膨張室を有する頭部用エアバッグと、
前記前席用膨張室の内面どうしを後部上方から前部斜め下方に向かって直線状に接合することにより前記前席用膨張室を主膨張室と前記主膨張室の後下方に位置する副膨張室とに区画する第一接合部と、前記第一接合部の長手方向中間部を不連続にすることにより形成され、前記ガス発生器により前記主膨張室が膨張しているとき、所定の力で前記主膨張室と前記副膨張室との連通を閉鎖させる開口部と、を備え、
前記ガス発生器からのガスが前記頭部用エアバッグに流入するガス流入口が前記前席用膨張室と前記後席用膨張室との間に設けられ、
前記主膨張室は後部上方から前部斜め下方に沿って筒状に膨張するよう形成されているとともに、前記後席用膨張室よりも容積が小さく設定され、前記ガス発生器から前記主膨張室へ供給されるガスの噴出方向が前記主膨張室の長手方向に沿って設定され、かつ、前記開口部は前記主膨張室が膨張したあと、前記開口部を通って前記副膨張室が膨張するよう形成され、
前記副膨張室は前記前席に着座した乗員の頭部より下方に位置すると想定される箇所に設定されているとともに、乗員とともに前記前席のシートバックを覆うようにほぼ三角形状に形成されている
ことを特徴とした頭部用エアバッグ装置。A front seat expansion chamber corresponding to at least a front seat of the vehicle, and a rear seat expansion chamber corresponding to a rear seat of the vehicle, which are deployed along a window portion of the vehicle by gas generated by a gas generator ; A head airbag having;
A sub-expansion in which the front seat expansion chamber is located below the main expansion chamber and the main expansion chamber by joining the inner surfaces of the front seat expansion chamber linearly from the rear upper portion to the front obliquely downward direction. When the main expansion chamber is inflated by the gas generator, a predetermined force is formed by discontinuously forming a first joint section partitioned into chambers and a longitudinal intermediate portion of the first joint section. And an opening for closing the communication between the main expansion chamber and the sub expansion chamber,
A gas inlet through which gas from the gas generator flows into the head airbag is provided between the front seat expansion chamber and the rear seat expansion chamber,
The main expansion chamber is formed so as to expand in a cylindrical shape from the rear upper part to the front obliquely lower part, and has a volume smaller than that of the rear seat expansion chamber, from the gas generator to the main expansion chamber. The direction in which the gas supplied to the gas is ejected is set along the longitudinal direction of the main expansion chamber, and the opening expands the sub expansion chamber through the opening after the main expansion chamber expands. It is formed as,
The auxiliary expansion chamber is set at a position assumed to be located below the head of the occupant seated in the front seat, and is formed in a substantially triangular shape so as to cover the seat back of the front seat together with the occupant. An airbag device for a head, characterized in that 前記第一接合部よりも前記主膨張室側にて前記第一接合部とほぼ平行に延びる第二接合部を具え、
前記主膨張室は、前記第一接合部と前記第二接合部との間で筒状に膨張するよう形成されている
ことを特徴とした請求項１に記載の頭部用エアバッグ装置。A second joint extending substantially parallel to the first joint on the main expansion chamber side of the first joint;
The head airbag device according to claim 1, wherein the main expansion chamber is formed to expand in a cylindrical shape between the first joint and the second joint. 前記主膨張室は、前記車両の前席に着座する乗員の頭部が位置すると想定される箇所に対応して形成されている
ことを特徴とした請求項１又は請求項２に記載の頭部用エアバッグ装置。3. The head according to claim 1, wherein the main expansion chamber is formed corresponding to a location where a head of an occupant seated in a front seat of the vehicle is supposed to be located. Air bag device. 前記副膨張室は、閉鎖空間に形成されており、前記開口部でのみ前記主膨張室と連通している
ことを特徴とした請求項１〜３のいずれか１項に記載の頭部用エアバッグ装置。The head air according to any one of claims 1 to 3, wherein the sub-expansion chamber is formed in a closed space and communicates with the main expansion chamber only at the opening. Bag device. 前記ガス発生器のガス噴出部は、前記頭部用エアバッグの前記ガス流入口に連結され、前記車両の前方及び後方のそれぞれに向けて開口する噴出口を具える
ことを特徴とした請求項１〜４のいずれか１項に記載の頭部用エアバッグ装置。Gas ejecting part of the gas generator is connected to the gas inlet of the airbag head claims that is characterized in that it comprises a spout which opens towards the respective front and rear of the vehicle The airbag apparatus for heads of any one of 1-4 . 前記ガス発生器のガス噴出量は、前記車両の後方に向けて噴出する量よりも前方に向けて噴出する量の方が少なく設定されている
ことを特徴とした請求項５に記載の頭部用エアバッグ装置。6. The head according to claim 5 , wherein a gas ejection amount of the gas generator is set to be smaller in an amount ejected forward than an amount ejected rearward of the vehicle. Air bag device.
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JP2003146176A (en) * 2001-11-14 2003-05-21 Toyoda Gosei Co Ltd Head protecting air bag device
JP2004034766A (en) * 2002-07-01 2004-02-05 Honda Motor Co Ltd Occupant restraining device
JP2008056242A (en) * 2002-02-27 2008-03-13 Takata Corp Head protection airbag and head protection airbag device
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WO2009154098A1 (en) * 2008-06-20 2009-12-23 オートリブ ディベロップメント エービー Curtain airbag device
JP2010116034A (en) * 2008-11-12 2010-05-27 Toyoda Gosei Co Ltd Head protecting airbag

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Publication number Priority date Publication date Assignee Title
JP2000355261A (en) * 1999-06-11 2000-12-26 Toyoda Gosei Co Ltd Air bag of head protection air bag device
JP2003146176A (en) * 2001-11-14 2003-05-21 Toyoda Gosei Co Ltd Head protecting air bag device
JP2008056242A (en) * 2002-02-27 2008-03-13 Takata Corp Head protection airbag and head protection airbag device
JP2004034766A (en) * 2002-07-01 2004-02-05 Honda Motor Co Ltd Occupant restraining device
JP2009006898A (en) * 2007-06-28 2009-01-15 Nippon Plast Co Ltd Curtain airbag device
WO2009154098A1 (en) * 2008-06-20 2009-12-23 オートリブ ディベロップメント エービー Curtain airbag device
JP2010116034A (en) * 2008-11-12 2010-05-27 Toyoda Gosei Co Ltd Head protecting airbag

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