JP2006256446A

JP2006256446A - Air bag apparatus for pedestrian

Info

Publication number: JP2006256446A
Application number: JP2005075444A
Authority: JP
Inventors: Hajime Kitte; 切手　　肇; Atsushi Nagata; 篤永田; Yoshio Mizuno; 喜夫水野
Original assignee: Toyoda Gosei Co Ltd
Current assignee: Toyoda Gosei Co Ltd
Priority date: 2005-03-16
Filing date: 2005-03-16
Publication date: 2006-09-28
Anticipated expiration: 2025-03-16
Also published as: JP4586588B2

Abstract

PROBLEM TO BE SOLVED: To provide an air bag apparatus for a pedestrian which apparatus surely prevents entrainment of the pedestrian under a wheel by an air bag that has completed its inflation with a suppressed inner pressure. SOLUTION: The air bag apparatus S is disposed on the under surface side of a vehicle body 1 at the front of front wheels of a vehicle V. According to the apparatus S, the air bag 48 is inflated to prevent entrainment of a pedestrian under a wheel from the front of the vehicle body 1 when an inflator 45 is actuated. The air bag 48 has a body bag 49 connected to the inflator 45, and a road surface side bag 62 which communicates with the body bag 49 and inflates under the front end of the body bag 49 to come in contact with a road surface GL. The road surface side bag 62 has the outer dimension D2 of a section in the front-to-rear direction determined to be smaller than the outer dimension D1 of a section in the front-to-rear direction of the body bag 49 at the completion of inflation. COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、車両の前輪の前方側における車体の下面側に、膨張可能なエアバッグを収納させ、作動時、歩行者の前方側からの巻き込みを防止可能に、エアバッグを膨張させる構成の歩行者用エアバッグ装置に関する。 The present invention is a walking with a configuration in which an inflatable airbag is housed on the lower surface side of the vehicle body on the front side of the front wheel of the vehicle, and the airbag is inflated so that it can be prevented from being caught from the front side of the pedestrian during operation. The present invention relates to an airbag device for a person.

従来、車両に搭載する歩行者用エアバッグ装置では、後輪側の車体下面と路面との間に膨張したエアバッグを配設させる構成のものがあった（例えば、特許文献１参照）。
特開平７−２７７１１４号公報 2. Description of the Related Art Conventionally, there has been a pedestrian airbag device mounted on a vehicle having a configuration in which an inflated airbag is disposed between a lower surface of a vehicle body on the rear wheel side and a road surface (for example, see Patent Document 1).
JP 7-277114 A

従来の歩行者用エアバッグ装置では、１つの袋状のエアバッグを展開膨張させる構成であった。通常、エアバッグは、袋状であることから、略球状に膨張しようとする性質がある。従来の歩行者用エアバッグ装置のごとく、大型のタイヤを装着させたトラックに搭載させる場合、車体の下面と路面との間に大きなスペースが生じやすいことから、エアバッグも、膨張完了時の前後方向の断面の外径寸法を大きく設定されたものが、使用されることとなる。前後方向の断面を略円形として、下面側を路面に接触させるように膨張するエアバッグでは、前後方向の断面において路面が接線を構成するような態様となり、膨張完了時に、下面側の接触部位から、前後方向の縁部側にかけて拡開するように、前後方向の断面を略三角形状とするような隙間が、路面と膨張を完了させたエアバッグとの間に発生することとなる。 In the conventional pedestrian airbag device, one bag-like airbag is deployed and inflated. Usually, since an airbag is bag-shaped, it has the property of trying to expand into a substantially spherical shape. Like conventional pedestrian airbag devices, when mounted on a truck fitted with large tires, a large space tends to be created between the lower surface of the vehicle body and the road surface. What set the outer diameter dimension of the cross section of a direction large is used. In an airbag that is inflated so that the cross section in the front-rear direction is substantially circular and the lower surface side is in contact with the road surface, the road surface forms a tangent line in the cross section in the front-rear direction. Thus, a gap is formed between the road surface and the airbag that has been inflated so as to expand toward the edge in the front-rear direction.

そして、外径寸法の大きなエアバッグの場合、この隙間が大きいことから、このような構成のエアバッグ装置を車両の前輪の前方側に搭載させる場合、転倒している歩行者が、路面とエアバッグとの間に生ずるこの隙間に侵入し、さらに、エアバッグと路面との間に入り込む虞れがあり、このような歩行者の車体前端部下面（前輪）側への巻き込みを防止するために、エアバッグの内圧を高くして膨張を完了させて対処することが考えられる。このような構成では、歩行者が、エアバッグと路面との隙間からエアバッグ直下へ侵入することを防止することができる。 In the case of an air bag having a large outer diameter, this gap is large. Therefore, when an air bag device having such a configuration is mounted on the front side of a front wheel of a vehicle, a pedestrian who falls is in contact with the road surface and the air bag. In order to prevent the pedestrian from getting into the lower surface (front wheel) side of the front end of the vehicle body, there is a risk of entering the gap formed between the bag and the air bag and the road surface. It is conceivable to cope with the problem by increasing the internal pressure of the airbag to complete the inflation. In such a configuration, it is possible to prevent a pedestrian from entering directly under the airbag through a gap between the airbag and the road surface.

しかし、エアバッグを、内圧を高くして膨張を完了させる構成とした場合、インフレーターの出力が高くなるとともに、膨張完了時の内圧が高くなれば、路面からの反力も大きくなる。この路面からの反力は、前輪の車体荷重を低減させるような作用を奏することとなるため、エアバッグの膨張完了後において、前輪の制動や操舵に影響を及ぼす場合があった。 However, when the airbag is configured to complete inflation by increasing the internal pressure, the output of the inflator increases, and the reaction force from the road surface increases as the internal pressure at the completion of inflation increases. Since the reaction force from the road surface acts to reduce the vehicle load on the front wheels, there are cases where the braking and steering of the front wheels are affected after the inflation of the airbag is completed.

本発明は、上述の課題を解決するものであり、内圧を抑えて膨張を完了させたエアバッグにより、歩行者の巻き込みを、的確に防止することが可能な歩行者用エアバッグ装置を提供することを目的とする。 This invention solves the above-mentioned subject, and provides the airbag apparatus for pedestrians which can prevent a pedestrian's entrainment exactly by the airbag which suppressed the internal pressure and completed the expansion | swelling. For the purpose.

本発明に係る歩行者用エアバッグ装置は、車両の前輪の前方側における車体の下面側に、車体と路面との間で膨張可能なエアバッグと、エアバッグに膨張用ガスを供給するインフレーターと、を収納させて構成され、インフレーターの作動時に、歩行者の前方側からの巻き込みを防止可能に、エアバッグを膨張させる構成の歩行者用エアバッグ装置であって、
エアバッグが、
インフレーターと連結されるとともに、膨張完了時における前後方向の断面形状を略円形とした本体バッグと、
本体バッグと連通されるとともに、膨張完了時における前後方向の断面形状を略円形とされて、膨張完了時に、本体バックの少なくとも前端下部側において、路面と接触するように配設される路面側バッグと、
を備えて構成され、
膨張完了時の路面側バッグが、前後方向の断面における外径寸法を、本体バッグの膨張完了時における前後方向の断面の外径寸法よりも、小さく設定されていることを特徴とする。 A pedestrian airbag device according to the present invention includes an airbag that can be inflated between a vehicle body and a road surface on the lower surface side of the vehicle body on the front side of a front wheel of the vehicle, and an inflator that supplies inflation gas to the airbag. Is a pedestrian airbag device configured to inflate an airbag so as to prevent entrainment from the front side of the pedestrian during operation of the inflator,
Airbag
A main body bag that is connected to the inflator and has a substantially circular cross-sectional shape in the front-rear direction when the inflation is completed,
The road-side bag communicated with the main body bag and has a substantially circular cross-sectional shape in the front-rear direction when the inflation is completed, and is disposed so as to be in contact with the road surface at least at the front end lower side of the main body bag when the inflation is completed. When,
Configured with
The road surface bag at the time of completion of expansion has an outer diameter dimension in a cross section in the front-rear direction set to be smaller than an outer diameter dimension of a cross section in the front-rear direction at the time of completion of expansion of the main body bag.

本発明の歩行者用エアバッグ装置では、エアバッグの膨張完了時において、膨張を完了させた本体バッグの前端側において、路面と接触するように、路面側バッグが、配設されることとなる。そして、路面側バッグは、膨張完了時における前後方向の断面形状を略円形とされているものの、その外径寸法を、本体バッグの膨張完了時における前後方向の断面の外径寸法よりも、小さく設定されていることから、従来のごとく１つのエアバッグを膨張させる場合と比較して、膨張完了時においてエアバッグの前端側の路面との間に生じる隙間を、小さくすることができ、この隙間から歩行者が膨張したエアバッグの直下へ侵入することを抑えることができる。そのため、本発明の歩行者用エアバッグ装置では、エアバッグの膨張完了時において、歩行者と路面側バッグとが干渉しても、歩行者のエアバッグ直下への侵入を防止できて、歩行者の車体前端部下面（前輪）側への巻き込みを、極力抑えることができる。 In the pedestrian airbag device of the present invention, when the airbag is completely inflated, the road surface side bag is disposed so as to come into contact with the road surface on the front end side of the main body bag that has been inflated. . The road surface bag has a substantially circular cross-sectional shape in the front-rear direction when the inflation is completed, but its outer diameter dimension is smaller than the outer diameter dimension of the cross-section in the front-rear direction when the main body bag is inflated. Therefore, compared to the case where one airbag is inflated as in the prior art, the gap generated between the airbag and the road surface on the front end side when the inflation is completed can be reduced. Therefore, it is possible to prevent the pedestrian from entering directly below the inflated airbag. Therefore, in the pedestrian airbag device of the present invention, even when the pedestrian and the road surface bag interfere with each other when the inflation of the airbag is completed, it is possible to prevent the pedestrian from entering directly below the airbag. Can be prevented as much as possible from being caught on the lower surface (front wheel) of the front end of the vehicle body.

勿論、本発明の歩行者用エアバッグ装置では、エアバッグの膨張完了時の内圧を高く設定しなくとも、膨張を完了させた路面側バッグにより、歩行者の侵入を抑えることができることから、エアバッグの膨張完了後における前輪の制動や操舵に与える影響を極力抑えることができる。 Of course, in the pedestrian airbag device according to the present invention, the intrusion of the pedestrian can be suppressed by the road-side bag that has been inflated without setting the internal pressure at the completion of the inflation of the airbag high. The influence on the braking and steering of the front wheels after the completion of the expansion of the bag can be minimized.

したがって、本発明の歩行者用エアバッグ装置では、内圧を抑えて膨張を完了させたエアバッグにより、歩行者の巻き込みを、的確に防止することができる。 Therefore, in the pedestrian airbag apparatus according to the present invention, the pedestrian can be prevented from being caught accurately by the airbag that has been inflated while suppressing the internal pressure.

また、上記構成の歩行者用エアバッグ装置において、エアバッグを、膨張完了時に、路面側バッグのみを路面と接触させるように、構成すれば、膨張完了時における本体バッグの前後方向の断面の外径寸法を小さく設定することができて、エアバッグ全体の容積を小さくすることができ、インフレーターの出力増加を抑えることができる。 Further, in the pedestrian airbag device having the above-described configuration, when the airbag is configured so that only the road surface side bag is brought into contact with the road surface when the inflation is completed, the airbag is out of the cross section in the front-rear direction of the main body bag when the inflation is completed. The diameter dimension can be set small, the volume of the entire airbag can be reduced, and an increase in the output of the inflator can be suppressed.

逆に、上記構成の歩行者用エアバッグ装置において、エアバッグを、膨張完了時に、本体バッグと路面側バッグとを、ともに、路面と接触させるように、構成すれば、エアバッグの膨張完了時において、路面側バッグと路面との間に生ずる摩擦抵抗に加えて、本体バッグと路面との間にも摩擦抵抗が生じ、この摩擦抵抗が、歩行者のエアバッグへの干渉時に、歩行者を的確に拘束可能なように作用することから、エアバッグの内圧を低下させることができて、歩行者をクッション性よく保護することができる。そして、上記構成の歩行者用エアバッグ装置では、本体バッグの前後方向の断面の外径寸法が、本体バッグを路面と接触させない構成の場合と比較して、大きくなって、本体バッグの容積が増大することとなるが、内圧上昇を抑えてエアバッグを膨張完了させることができることから、インフレーターの出力増大を極力抑えることができる。 Conversely, in the airbag device for a pedestrian having the above-described configuration, when the airbag is configured so that the main body bag and the road surface bag are both brought into contact with the road surface when the inflation is completed, when the airbag is completely expanded. In addition, in addition to the frictional resistance generated between the road surface bag and the road surface, a frictional resistance is also generated between the main body bag and the road surface, and this frictional resistance causes the pedestrian to interfere with the pedestrian's airbag. Since it acts so that it can be restrained accurately, the internal pressure of an airbag can be reduced and a pedestrian can be protected with sufficient cushioning properties. And in the airbag apparatus for pedestrians of the said structure, the outer diameter dimension of the cross section of the front-back direction of a main body bag becomes large compared with the case where the main body bag is not made to contact a road surface, and the volume of a main body bag is increased. Although it increases, the increase in the output of the inflator can be suppressed as much as possible because the inflation of the airbag can be completed while suppressing the increase in internal pressure.

なお、上記構成の歩行者用エアバッグ装置において、エアバッグに、路面側バッグを複数個配設させる構成としてもよい。 In the pedestrian airbag device having the above-described configuration, a plurality of road surface bags may be disposed on the airbag.

以下、本発明の一実施形態を図面に基づいて説明すると、実施形態の歩行者用エアバッグ装置Ｓは、図１〜４に示すように、車両としてのトラックＶに搭載されるものであり、前輪６・６の前方側における車体（ボディ）１の前端部１ａの下面側に、配設されている。なお、これらの前輪６・６は、制動可能で、かつ、操舵可能として、配設されている。また、図１・２に示す符号７の部材はフロントバンパ、符号８の部材はスポイラーであり、これらの部材は、図示しないブラケット等を利用して、ボディ１側のフレーム２に取り付けられている。フレーム２は、実施形態の場合、前後方向に略沿って配設されるもので、左右方向に沿った２箇所に、平行に配設されている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A pedestrian airbag apparatus S according to the embodiment is mounted on a truck V as a vehicle, as shown in FIGS. It is arranged on the lower surface side of the front end portion 1a of the vehicle body (body) 1 on the front side of the front wheels 6. These front wheels 6 and 6 are disposed so that they can be braked and steered. 1 and 2 are a front bumper, and a member 8 is a spoiler. These members are attached to the frame 2 on the body 1 side using a bracket (not shown). . In the embodiment, the frame 2 is disposed substantially along the front-rear direction, and is disposed in parallel at two locations along the left-right direction.

さらに、本明細書での前後・上下・左右の方向は、車両Ｖの直進方向を前方向とする基準方向として、車両Ｖの前後・上下・左右の方向と一致するように、対応させている。 Further, the front-rear, up-down, left-right directions in the present specification are made to correspond to the front-rear, up-down, left-right directions of the vehicle V, with the straight direction of the vehicle V being the forward direction. .

歩行者用エアバッグ装置Ｓは、図１〜６に示すように、エアバッグ４８、エアバッグ４８に膨張用ガスを供給するインフレーター４５、折り畳んだエアバッグ４８とインフレーター４５とを収納保持するケース１６、及び、折り畳んだエアバッグ４８の下面側を覆うカバー２６、を備えて構成されている。 1 to 6, the pedestrian airbag apparatus S includes an airbag 48, an inflator 45 that supplies inflation gas to the airbag 48, and a case 16 that stores and holds the folded airbag 48 and the inflator 45. And a cover 26 that covers the lower surface side of the folded airbag 48.

また、歩行者用エアバッグ装置Ｓは、歩行者の接近を検知する図示しないセンサをバンパ７の所定位置に配設させるとともに、このセンサからの信号を入力した図示しない制御装置が、歩行者の車両Ｖとの衝突を予測した際に、インフレーター４５を作動させ、エアバッグ４８に膨張用ガスを供給するように、構成されている。 The pedestrian airbag device S has a sensor (not shown) for detecting the approach of the pedestrian disposed at a predetermined position of the bumper 7, and a control device (not shown) to which a signal from the sensor is inputted When a collision with the vehicle V is predicted, the inflator 45 is operated to supply the inflation gas to the airbag 48.

インフレーター４５は、実施形態の場合、左右方向に沿って複数（実施形態では５個）配設されている。各インフレーター４５は、下端側に複数のガス吐出口４５ｂを有した円柱状の本体部４５ａを備え、本体部４５ａの外周面には、略四角板状のフランジ部４５ｃが突設されている。フランジ部４５ｃには、エアバッグ４８の後述する本体バッグ４９に形成される開口周縁５２とともにインフレーター４５をケース１６の天井壁部１７に固定するためのリテーナ１０のボルト１０ａを挿通させる取付孔４５ｄが、形成されている。 In the case of the embodiment, a plurality (five in the embodiment) of inflators 45 are arranged along the left-right direction. Each inflator 45 includes a cylindrical main body portion 45a having a plurality of gas discharge ports 45b on the lower end side, and a substantially square plate-like flange portion 45c projects from the outer peripheral surface of the main body portion 45a. The flange portion 45c has an attachment hole 45d through which the bolt 10a of the retainer 10 for fixing the inflator 45 to the ceiling wall portion 17 of the case 16 is inserted together with an opening peripheral edge 52 formed in a body bag 49 described later of the airbag 48. Is formed.

ケース１６は、下方を開口させた箱形状の板金製として、略水平方向に沿って配設される天井壁部１７と、天井壁部１７の外周縁の全周から下方に延びる筒状の側壁部２３と、を備えて構成されている。 The case 16 is made of a box-shaped sheet metal having an opening at the bottom, a ceiling wall portion 17 disposed substantially in the horizontal direction, and a cylindrical side wall extending downward from the entire circumference of the outer peripheral edge of the ceiling wall portion 17. And a unit 23.

天井壁部１７の平面形状は、左右方向に沿った中央部１７ａから左右両側部１７ｂ・１７ｃを、それぞれ、斜め後方の外側に延ばすような形状として、配設されている。また、天井壁部１７の中央部１７ａには、円形に開口した複数（実施形態の場合には５個）の挿入孔１８が、左右方向に沿って並設されている。各挿入孔１８には、それぞれ、インフレーター４５の円柱状の本体部４５ａが、上方から挿入されている。各挿入孔１８の周縁には、それぞれ、４個ずつの取付孔１９が、上下方向に貫通されている。これらの取付孔１９には、各インフレーター４５を天井壁部１７の上面側から取り付け、また、エアバッグ４８（本体バッグ４９）に設けられた各インフレーター４５に対応する開口５１の周縁５２を、天井壁部１７の下面側から取り付けて、周縁５２からの膨張用ガスの漏れを防止するためのリテーナ１０の各ボルト１０ａが、挿通されることとなる。 The planar shape of the ceiling wall portion 17 is arranged such that the left and right side portions 17b and 17c extend from the center portion 17a along the left and right direction obliquely rearward outside. Further, a plurality of (in the case of the embodiment, five) insertion holes 18 opened in a circular shape are arranged in parallel in the left-right direction in the central portion 17 a of the ceiling wall portion 17. A cylindrical main body 45a of the inflator 45 is inserted into each insertion hole 18 from above. At the periphery of each insertion hole 18, four mounting holes 19 are penetrated in the vertical direction. Each inflator 45 is attached to these attachment holes 19 from the upper surface side of the ceiling wall portion 17, and the periphery 52 of the opening 51 corresponding to each inflator 45 provided in the airbag 48 (main body bag 49) is provided on the ceiling. Each bolt 10a of the retainer 10 that is attached from the lower surface side of the wall portion 17 and prevents leakage of the inflation gas from the peripheral edge 52 is inserted.

なお、各リテーナ１０は、インフレーター４５の本体部４５ａを挿通可能な孔を備えた略四角環状として、四隅に上方へ延びるボルト１０ａを設けて構成されている。そして、リテーナ１０は、ボルト１０ａと、ボルト１０ａに締結されるナット１１と、を利用して、エアバッグ４８（本体バッグ４９）の開口５１の周縁５２とインフレーター４５とを、天井壁部１７に固定させる役目を果たしている。 Each retainer 10 is configured as a substantially square ring having a hole through which the main body 45a of the inflator 45 can be inserted, and is provided with bolts 10a extending upward at the four corners. The retainer 10 uses the bolt 10a and the nut 11 fastened to the bolt 10a to connect the peripheral edge 52 of the opening 51 of the airbag 48 (main body bag 49) and the inflator 45 to the ceiling wall portion 17. It plays the role of fixing.

さらに、天井壁部１７の前縁側には、エアバッグ４８（本体バッグ４９）の取付補強部５７を天井壁部１７の下面側に固定するための複数の取付孔２０が、形成されている。各取付孔２０には、取付補強部５７の各取付孔５８とともに、ボルト１３が挿通され、そして、ボルト１３にナット１４が締結されることにより、本体バッグ４９の取付補強部５７が、本体バッグ４９の開口５１の周縁５２における前側部５２ａより、前方側の位置に配置された状態で、天井壁部１７に取付固定されることとなる。 Further, a plurality of attachment holes 20 for fixing the attachment reinforcing portion 57 of the airbag 48 (main body bag 49) to the lower surface side of the ceiling wall portion 17 are formed on the front edge side of the ceiling wall portion 17. The bolts 13 are inserted into the mounting holes 20 together with the mounting holes 58 of the mounting reinforcing portions 57, and the nuts 14 are fastened to the bolts 13, whereby the mounting reinforcing portions 57 of the main body bag 49 are connected to the main body bags. It is attached and fixed to the ceiling wall portion 17 in a state of being arranged at a position on the front side from the front side portion 52 a in the peripheral edge 52 of the opening 51 of 49.

なお、本体バッグ４９の取付補強部５７を、本体バッグ４９の各開口５１の周縁５２における前側部５２ａより、前方側の位置に配置させた状態で、天井壁部１７に取付固定させる理由は、エアバッグ装置Ｓの作動時における開口周縁５２からのガス漏れを防止するためである。すなわち、図１１に示すように、膨張を完了させた本体バッグ４９と路面側バッグ６２とが、それぞれ、後述する本体部５０・６３の下面５０ａ・６３ａ側を路面ＧＬに接触させ、その状態で、車両Ｖが前進していると、本体バッグ４９は、これらの下面５０ａ・６３ａと路面ＧＬとの間に生じる摩擦抵抗により、下面５０ａ側が後方側へ引っ張られ、その際、天井壁部１７への取付部位としての取付補強部５７がなければ、本体バッグ４９の後方側への引張力Ｔ（図１０参照）が、直接、開口周縁５２の前側部５２ａにおける取付孔５３の周縁部位に作用し、その部位を破断させたり伸ばしたりして、取付孔５３付近からガス漏れを生じさせる虞れが生ずる。しかし、各取付孔５３の前方側に、本体バッグ４９の天井壁部１７への取付部位、すなわち、取付補強部５７が配設されていれば、本体バッグ４９における路面ＧＬとの摩擦抵抗による後方側への引張力Ｔに対して、ボルト１３止めされた取付補強部５７が対抗できて、取付孔５３付近からのガス漏れを防止できる。そして勿論、この取付補強部５７自体は、膨張用ガスを流入させて膨らむ部位ではないことから、取付孔５８の周縁が伸びたり破断しても、ガス漏れは発生しない。 The reason why the attachment reinforcing portion 57 of the main body bag 49 is attached and fixed to the ceiling wall portion 17 in a state where the attachment reinforcing portion 57 of the main body bag 49 is disposed at a position on the front side from the front side portion 52a in the peripheral edge 52 of each opening 51 is as follows. This is to prevent gas leakage from the opening peripheral edge 52 when the airbag device S is activated. That is, as shown in FIG. 11, the main body bag 49 and the road surface side bag 62 that have been inflated contact the lower surfaces 50a and 63a of the main body portions 50 and 63, which will be described later, with the road surface GL. When the vehicle V is moving forward, the lower surface 50a side of the main body bag 49 is pulled rearward due to the frictional resistance generated between the lower surfaces 50a and 63a and the road surface GL. If there is no attachment reinforcing portion 57 as the attachment portion, the tensile force T (see FIG. 10) to the rear side of the main body bag 49 directly acts on the peripheral portion of the attachment hole 53 in the front side portion 52a of the opening peripheral edge 52. Then, there is a possibility that the part is broken or extended to cause gas leakage from the vicinity of the mounting hole 53. However, if the attachment part to the ceiling wall part 17 of the main body bag 49, that is, the attachment reinforcing part 57, is disposed on the front side of each attachment hole 53, the rear side due to the frictional resistance with the road surface GL in the main body bag 49. The attachment reinforcing portion 57 secured to the bolt 13 can counter the tensile force T to the side, and gas leakage from the vicinity of the attachment hole 53 can be prevented. Of course, the attachment reinforcing portion 57 itself is not a portion that inflates when inflating gas is introduced, so that even if the peripheral edge of the attachment hole 58 extends or breaks, gas leakage does not occur.

また、天井壁部１７における中央部１７ａの左右両端付近における前後両縁側には、ケース１６をフレーム２に固定するための複数の取付孔２１が、形成されている。各取付孔２１には、ボルト２２が挿通され、このボルト２２をフレーム２に固着されたナット２ａに締結させることにより、ケース１６がボディ１側のフレーム２に固定されることとなる。 A plurality of mounting holes 21 for fixing the case 16 to the frame 2 are formed on both front and rear edges in the vicinity of both left and right ends of the central portion 17 a of the ceiling wall portion 17. Bolts 22 are inserted into the mounting holes 21, and the bolts 22 are fastened to nuts 2 a fixed to the frame 2, whereby the case 16 is fixed to the frame 2 on the body 1 side.

さらに、ケース１６の側壁部２３の下端には、略水平方向の外方へ延びるフランジ部２３ａが形成されており、このフランジ部２３ａに、図示しないクリップやボルト等の固定手段を利用して、カバー２６が固定されている。カバー２６は、合成樹脂等から形成されて、ケース１６の下端側における側壁部２３で囲まれた開口１６ａを覆うように配設されて、ケース１６内に収納されたエアバッグ４８が下方の路面ＧＬ側に膨張して突出できるように、エアバッグ４８に押されて破断し、そして、前後方向両側に開くように、配設されている。なお、カバー２６は、両開きでなく、後方側や前方側へ片開きで開くように構成してもよい。 Furthermore, a flange portion 23a extending outward in a substantially horizontal direction is formed at the lower end of the side wall portion 23 of the case 16, and a fixing means such as a clip or a bolt (not shown) is used for the flange portion 23a. The cover 26 is fixed. The cover 26 is made of synthetic resin or the like, and is disposed so as to cover the opening 16a surrounded by the side wall 23 on the lower end side of the case 16, and the airbag 48 housed in the case 16 has a lower road surface. In order to be able to expand and protrude toward the GL side, the airbag 48 is pushed and broken, and is disposed so as to open on both sides in the front-rear direction. In addition, you may comprise the cover 26 so that it may open not only by double opening but by a single opening to the back side or the front side.

エアバッグ４８は、図２・４に示すように、膨張完了時に、車両Ｖの左右方向の略全域にわたって配設されるもので、インフレーター４５と連結されて車体１と路面ＧＬとの間で膨張可能とされる本体バッグ４９と、本体バッグ４９と連通されるとともに膨張完了時に本体バッグ４９の前端下部側に配設される路面側バッグ６２と、から構成されている。 As shown in FIGS. 2 and 4, the airbag 48 is disposed over substantially the entire left and right direction of the vehicle V when the inflation is completed, and is connected to the inflator 45 to inflate between the vehicle body 1 and the road surface GL. The main body bag 49 and the road surface side bag 62 communicated with the main body bag 49 and disposed on the lower side of the front end of the main body bag 49 when the inflating is completed.

本体バッグ４９は、図９に示すように、ポリエステル糸やポリアミド糸等を使用して織った可撓性を有する基布Ｃを複数枚重ねるように接合させて形成されている。実施形態の場合、本体バッグ４９は、図７・８に示すように、略同形の上側布４９ａと下側布４９ｂとの外周縁相互を縫合若しくは接着等を利用して結合させて、形成されている。また、本体バッグ４９は、膨張用ガスを流入させて略円柱状に膨らむ本体部５０と、上側・下側布４９ａ・４９ｂの相互の結合代となる周縁部５６と、の部位を備えて構成されている。そして、実施形態の場合、周縁部５６の前縁側の部位５６ａが、取付補強部５７を構成することとなり、取付補強部５７には、既述したように、ケース天井壁部１７へ取付可能なように、ボルト１３を挿通させる取付孔５８が、形成されている。 As shown in FIG. 9, the main body bag 49 is formed by joining a plurality of flexible base fabrics C woven using polyester yarn, polyamide yarn, or the like so as to overlap each other. In the case of the embodiment, as shown in FIGS. 7 and 8, the main body bag 49 is formed by joining the outer peripheral edges of the upper cloth 49a and the lower cloth 49b having substantially the same shape using stitching or adhesion. ing. The main body bag 49 includes a main body portion 50 that inflates into a substantially columnar shape by flowing an inflating gas, and a peripheral portion 56 serving as a coupling allowance between the upper and lower cloths 49a and 49b. Has been. And in the case of embodiment, the part 56a of the front edge side of the peripheral part 56 will comprise the attachment reinforcement part 57, and it can attach to the case ceiling wall part 17 in the attachment reinforcement part 57 as already stated. Thus, a mounting hole 58 through which the bolt 13 is inserted is formed.

なお、本体バッグ４９は、下側布４９ｂを路面ＧＬに接触させる側としており、耐磨耗性を高めるために、下側布４９ｂを構成する基布Ｃの枚数が、上側布４９ａに使用する基布Ｃの枚数より、多く使用されている。実施形態の場合、具体的には、上側部４９ａは、基布Ｃが二枚重ねで使用され、下側布４９ｂは、基布Ｃが四枚重ねで使用されている（図９参照）。 The main body bag 49 is a side where the lower cloth 49b is brought into contact with the road surface GL, and the number of the base cloths C constituting the lower cloth 49b is used for the upper cloth 49a in order to improve wear resistance. It is used more than the number of base fabrics C. In the case of the embodiment, specifically, the upper portion 49a is used by stacking two base fabrics C, and the lower fabric 49b is used by stacking four base fabrics C (see FIG. 9).

また、上側布４９ａには、各インフレーター４５を挿入させるための５個の円形のガス流入用開口５１が形成されるとともに、各開口５１の周縁５２には、各リテーナ１０のボルト１０ａを挿通させる取付孔５３が形成されている。そして、これらの開口５１の配置位置は、上側布４９ａの前後方向の中央位置ではなく、前縁部５６ａ側に片寄らせるように接近させて、配設されている。すなわち、平らに展開させた際に同形状となる上側・下側布４９ａ・４９ｂの周縁相互を縫合や接着等を利用して結合させた結合バッグを使用して、この本体バッグ４９を構成する際、下側布４９ｂを路面ＧＬと接触する側とし、かつ、周縁部５６の前縁部５６ａを、開口５１の前方側に配置される取付補強部５７として利用することから、開口５１は、前縁部５６ａ側に片寄って配設させる必要が生ずるためである。 Further, five circular gas inflow openings 51 for inserting the inflators 45 are formed in the upper cloth 49a, and the bolts 10a of the retainers 10 are inserted into the peripheral edges 52 of the openings 51. A mounting hole 53 is formed. The arrangement positions of these openings 51 are not close to the center position in the front-rear direction of the upper cloth 49a but are arranged so as to be shifted toward the front edge portion 56a. That is, the main body bag 49 is configured by using a coupling bag in which the peripheral edges of the upper and lower fabrics 49a and 49b having the same shape when flattened are joined by using stitching or adhesion. At this time, the lower cloth 49b is used as the side in contact with the road surface GL, and the front edge portion 56a of the peripheral edge portion 56 is used as the attachment reinforcing portion 57 disposed on the front side of the opening 51. This is because it becomes necessary to displace the front edge portion 56a.

さらに、下側布４９ｂの前後方向の中央付近には、路面側バッグ６２に連通される連通用開口６４を構成する開口４９ｃが、形成されている。実施形態の場合、開口４９ｃは、それぞれ左右方向に沿った長円状とされて、左右方向に沿った５箇所に、形成されている。 Furthermore, an opening 49c constituting a communication opening 64 that is communicated with the road surface bag 62 is formed near the center of the lower cloth 49b in the front-rear direction. In the case of the embodiment, the openings 49c are each formed in an oval shape along the left-right direction, and are formed at five locations along the left-right direction.

膨張完了時の本体部５０は、車両搭載状態の平面形状を、ケース１６の開口１６ａの平面形状より大きな略相似形状として、左右方向に沿った中央部５０ｂと、中央部５０ｂの左右両端付近から斜め後方の外側に延ばした左右両側部５０ｃ・５０ｅと、を備える形状としている（図７・８参照）。なお、膨張完了時の本体部５０は、左右方向の幅寸法を、車両Ｖの左右方向の幅寸法と略等しくして、前後方向の断面形状を略円形とした円柱状とされるとともに、上下方向の寸法を、下面５０ａが、前輪６・６の接触している路面ＧＬと接触できる寸法に、設定されている。 When the expansion is completed, the main body 50 has a vehicle-mounted planar shape that is substantially similar to the planar shape of the opening 16a of the case 16, and a central portion 50b along the left-right direction and from both the left and right ends of the central portion 50b. Left and right side portions 50c and 50e extending obliquely rearward outside (see FIGS. 7 and 8). The main body 50 at the time of completion of expansion has a columnar shape in which the width dimension in the left-right direction is substantially equal to the width dimension in the left-right direction of the vehicle V, and the cross-sectional shape in the front-rear direction is substantially circular. The direction dimension is set so that the lower surface 50a can come into contact with the road surface GL with which the front wheels 6 and 6 are in contact.

また、本体バッグ４９における本体部５０の内部には、図９に示すように、膨張用ガスＧを左側部５０ｃと右側部５０ｅとの各端部５０ｄ・５０ｆまで迅速に供給できるように、整流布６０が配設されている。整流布６０は、基布Ｃと同様な布材から円筒状に形成され、開口５１や取付孔５３に対応する位置に、同形状の開口６０ａと貫通孔６０ｂとが、配設されている。この整流布６０は、左右方向の長さ寸法を、本体部５０の中央部５０ｂの左右方向の長さ寸法と略等しくし、膨張時の外径寸法を、膨張時の中央部５０ｂの略１／２としている。そして、この整流布６０は、各リテーナ１０とナット１１とによって、本体バッグ４９の開口周縁５２とともに、ケース１６の天井壁部１７に取り付けられている。 Further, as shown in FIG. 9, the main body bag 49 has a rectifier so that the inflation gas G can be quickly supplied to the end portions 50d and 50f of the left side portion 50c and the right side portion 50e. A cloth 60 is provided. The rectifying cloth 60 is formed in a cylindrical shape from the same cloth material as that of the base cloth C, and an opening 60 a and a through hole 60 b having the same shape are arranged at positions corresponding to the opening 51 and the attachment hole 53. The straightening cloth 60 has a length dimension in the left-right direction substantially equal to a length dimension in the left-right direction of the central part 50b of the main body 50, and an outer diameter dimension when inflated is substantially 1 of the center part 50b at the time of inflation. / 2. The rectifying cloth 60 is attached to the ceiling wall portion 17 of the case 16 together with the opening peripheral edge 52 of the main body bag 49 by the retainers 10 and the nuts 11.

路面側バッグ６２は、本体バッグ４９と同様に、図９に示すように、ポリエステル糸やポリアミド糸等を使用して織った可撓性を有する基布Ｃを複数枚重ねるように接合させて形成されている。実施形態の場合、路面側バッグ６２は、略同形の上側布６２ａと下側布６２ｂとの外周縁相互を縫合若しくは接着等を利用して結合させて、形成されており、上側・下側布６２ａ・６２ｂは、耐磨耗性を高めるために、ともに、基布Ｃが四枚重ねで使用されている。また、路面側バッグ６２は、連通用開口６４から膨張用ガスを流入させて略円柱状に膨らむ本体部６３と、上側・下側布６２ａ・６２ｂの相互の結合代となる周縁部６６と、の部位を備えて構成されている。上側布６２ａには、連通用開口６４を構成する開口６２ｃが、本体バッグ４９の開口４９ｃに対応して、形成されている。そして、路面側バッグ６２は、開口６２ｃを本体バッグ４９の開口４９ｃに対応させて、開口４９ｃ・６２ｃの周縁を、縫合若しくは接着等を利用して結合させることにより、連通用開口６４の周縁部位で、本体バッグ４９に連結されている。 As shown in FIG. 9, the road surface bag 62 is formed by joining a plurality of flexible base fabrics C woven using polyester yarn, polyamide yarn or the like, as shown in FIG. Has been. In the case of the embodiment, the road surface side bag 62 is formed by joining the outer peripheral edges of the upper cloth 62a and the lower cloth 62b having substantially the same shape by using stitching or adhesion, and the upper and lower cloths. In both 62a and 62b, the base fabric C is used in a four-layered manner in order to improve the wear resistance. Further, the road surface bag 62 includes a main body portion 63 that is inflated into a substantially cylindrical shape by inflating an inflation gas from the communication opening 64, and a peripheral edge portion 66 that serves as a coupling allowance between the upper and lower cloths 62a and 62b. It comprises the part of. The upper cloth 62 a is formed with an opening 62 c constituting the communication opening 64 corresponding to the opening 49 c of the main body bag 49. And the road surface side bag 62 makes the opening 62c correspond to the opening 49c of the main body bag 49, and connects the periphery of the openings 49c and 62c by using stitching or adhesion, etc. Thus, the main body bag 49 is connected.

路面側バッグ６２は、図１・１１に示すように、エアバッグ４８の膨張完了時において、膨張を完了させた本体バッグ４９の前端下部側に配設されるように、平らに展開した本体バッグ４９の下側布４９ｂにおける前後方向の中間部位に、連結されている。そして、路面側バッグ６２は、本体部６３を、左右方向の幅寸法を本体バッグ４９と略等しくするとともに、本体バッグ４９の本体部５０に沿うように配置されて、左右方向に沿った中央部６３ｂと、中央部６３ｂの左右両端付近から斜め後方の外側に延ばした左右両側部６３ｃ・６３ｄと、を備える形状としている。 As shown in FIGS. 1 and 11, the road surface bag 62 is a main body bag that is flatly deployed so as to be disposed on the lower side of the front end of the main body bag 49 that has been inflated when the air bag 48 is inflated. 49 is connected to an intermediate portion of the lower cloth 49b in the front-rear direction. And the road surface side bag 62 is arranged so that the width dimension in the left-right direction of the main body 63 is substantially equal to that of the main body bag 49, and along the main body 50 of the main body bag 49, and the central portion along the left-right direction. 63b and left and right side parts 63c and 63d extending diagonally rearward from the left and right ends of the center part 63b.

膨張完了時の本体部６３は、前後方向の断面形状を略円形とした円柱状とされるとともに、前後方向の断面形状における外径寸法Ｄ２を、本体バッグ４９の膨張完了時における本体部５０の前後方向の断面形状における外径寸法Ｄ１より、小さく設定されている。すなわち、実施形態のエアバッグ４８では、本体バッグ４９の膨張完了時に、本体バッグ４９と路面ＧＬとの間において、路面ＧＬとの接触部位６０ｈから前面６０ｇにかけて拡開するような、前後方向の断面を略直角三角形状とする隙間ＳＰ（図１２の二点鎖線参照）を埋めるように、路面側バッグ６２が配設されることとなる。さらに、具体的には、膨張完了時の本体部６３は、その外径寸法Ｄ２を、下面６３ａが、前輪６・６の接触している路面ＧＬと接触でき、かつ、前面６３ｅが、膨張を完了させた本体バッグ４９の本体部５０の前面５０ｇと、略鉛直方向に沿った同一平面（同一接線）Ｌに接するような寸法に、設定されている（図１２参照）。 The main body 63 at the time of completion of the expansion is a columnar shape having a substantially circular cross-sectional shape in the front-rear direction, and the outer diameter D2 of the cross-sectional shape in the front-rear direction is set to It is set smaller than the outer diameter D1 in the cross-sectional shape in the front-rear direction. That is, in the airbag 48 of the embodiment, when the expansion of the main body bag 49 is completed, the cross section in the front-rear direction is expanded between the main body bag 49 and the road surface GL from the contact portion 60h with the road surface GL to the front surface 60g. The road surface bag 62 is disposed so as to fill the gap SP (see the two-dot chain line in FIG. 12) having a substantially right triangle shape. More specifically, the main body 63 at the completion of the expansion has an outer diameter D2 that allows the lower surface 63a to contact the road surface GL in contact with the front wheels 6 and 6, and the front surface 63e to expand. The size is set so as to contact the front surface 50g of the main body 50 of the completed main body bag 49 and the same plane (same tangent) L along the substantially vertical direction (see FIG. 12).

そして、実施形態のエアバッグ４８では、車両搭載状態で膨張を完了させた際、前輪６・６の制動と操舵とを可能に前輪６・６の路面ＧＬとの接触状態を維持させ、かつ、歩行者の巻き込みを防止可能に、下面５０ａ・６３ａを路面ＧＬに圧接させる内圧を確保して、路面ＧＬと前輪６・６の前方側における車体１の前端部１ａの下面との間を塞いで膨張するように、設定されている。 And, in the airbag 48 of the embodiment, when the inflation is completed in the vehicle mounted state, the front wheels 6 and 6 can be braked and steered so that the contact state with the road surface GL of the front wheels 6 and 6 is maintained, and In order to prevent the pedestrian from being caught, an internal pressure that presses the lower surfaces 50a and 63a against the road surface GL is secured, and the space between the road surface GL and the lower surface of the front end 1a of the vehicle body 1 on the front side of the front wheels 6 and 6 is blocked. It is set to expand.

この実施形態の歩行者用エアバッグ装置Ｓでは、車両Ｖの歩行者との衝突を予測した際、図示しない制御装置が、インフレーター４５に作動信号を出力することから、インフレーター４５のガス吐出口４５ｂから膨張用ガスが吐出される。そのため、ケース１６に収納されていたエアバッグ４８が、図１・２の二点鎖線や図１１の実線で示すように、膨張して、カバー２６を押し開いてケース１６の開口１６ａから下方へ突出し、膨張を完了させて、路面ＧＬと前輪６・６の前方側における車体１の前端部１ａの下面との間を塞いで、各本体・路面側バッグ４９・６２の下面４９ａ・６２ａ側を路面ＧＬに圧接させることとなる。 In the pedestrian airbag device S of this embodiment, when a collision with the pedestrian of the vehicle V is predicted, a control device (not shown) outputs an operation signal to the inflator 45, so that the gas discharge port 45 b of the inflator 45. An expansion gas is discharged from the nozzle. Therefore, as shown by the two-dot chain line in FIGS. 1 and 2 and the solid line in FIG. 11, the airbag 48 stored in the case 16 is inflated to push open the cover 26 and downward from the opening 16 a of the case 16. After projecting and completing the expansion, the space between the road surface GL and the lower surface of the front end 1a of the vehicle body 1 on the front side of the front wheels 6 and 6 is closed, and the lower surfaces 49a and 62a side of the main bodies and the road surface bags 49 and 62 are It will be brought into pressure contact with the road surface GL.

そして、実施形態の歩行者用エアバッグ装置Ｓでは、エアバッグ４８の膨張完了時において、膨張を完了させた本体バッグ４９の前端側において、路面ＧＬと接触するように、路面側バッグ６２が、配設されることとなる。そして、路面側バッグ６２は、膨張完了時における前後方向の断面形状を略円形とされているものの、その外径寸法Ｄ２を、本体バッグ４９の膨張完了時における前後方向の断面の外径寸法Ｄ１よりも、小さく設定されていることから、従来のごとく１つのエアバッグを膨張させる場合と比較して、膨張完了時においてエアバッグ４８（路面側バッグ６２）の前端側と路面ＧＬとの間に生じる隙間を、小さくすることができ、この隙間から歩行者が膨張したエアバッグ４８の直下へ侵入することを抑えることができる。そのため、実施形態の歩行者用エアバッグ装置Ｓでは、エアバッグ４８の膨張完了時において、歩行者と路面側バッグ６２とが干渉しても、歩行者のエアバッグ４８の直下への侵入を防止できて、歩行者の車体前端部１ａ下面（前輪６）側への巻き込みを、極力抑えることができる。 In the pedestrian airbag device S of the embodiment, when the airbag 48 is completely inflated, the road surface bag 62 is in contact with the road surface GL on the front end side of the main body bag 49 that has been inflated. It will be arranged. The road surface side bag 62 has a substantially circular cross-sectional shape in the front-rear direction when the inflation is completed, but the outer diameter dimension D2 is the outer diameter dimension D1 of the cross-section in the front-rear direction when the main body bag 49 is inflated. Therefore, compared with the case where one airbag is inflated as in the prior art, the air bag 48 (road surface side bag 62) is in the space between the front end side and the road surface GL when the inflation is completed. The generated gap can be reduced, and the pedestrian can be prevented from entering directly below the inflated airbag 48 from this gap. Therefore, in the airbag device S for pedestrians of the embodiment, even when the pedestrian and the road surface side bag 62 interfere with each other when the inflation of the airbag 48 is completed, the pedestrian's airbag 48 is prevented from entering immediately below the airbag 48. It is possible to suppress the pedestrian's entanglement of the vehicle body front end 1a on the lower surface (front wheel 6) side as much as possible.

勿論、実施形態の歩行者用エアバッグ装置Ｓでは、エアバッグ４８の膨張完了時の内圧を高く設定しなくとも、膨張を完了させた路面側バッグ６２により、歩行者の侵入を抑えることができることから、エアバッグ４８の膨張完了後における前輪の制動や操舵に与える影響を極力抑えることができる。 Of course, in the pedestrian airbag device S of the embodiment, the intrusion of the pedestrian can be suppressed by the road surface side bag 62 that has completed the expansion without setting the internal pressure at the completion of the expansion of the airbag 48 high. Thus, the influence on the braking and steering of the front wheels after the completion of the inflation of the airbag 48 can be suppressed as much as possible.

したがって、実施形態の歩行者用エアバッグ装置Ｓでは、内圧を抑えて膨張を完了させたエアバッグ４８により、歩行者の巻き込みを、的確に防止することができる。 Therefore, in the airbag device S for pedestrians of the embodiment, the pedestrian can be prevented from being caught by the airbag 48 that has been inflated while suppressing the internal pressure.

また、実施形態の歩行者用エアバッグ装置Ｓでは、エアバッグ４８の膨張完了時に、本体バッグ４９と路面側バッグ６２との下面５０ａ・６３ａを、ともに、路面ＧＬと接触させる構成であることから、エアバッグ４８の膨張完了時において、路面側バッグ６２と路面ＧＬとの間に生ずる摩擦抵抗に加えて、本体バッグ４９と路面ＧＬとの間にも摩擦抵抗が生じ、この摩擦抵抗が、歩行者のエアバッグ４８への干渉時に、歩行者を的確に拘束可能なように作用することから、エアバッグ４８の内圧を相対的に低下させることができて、歩行者をクッション性よく保護することができる。 In the pedestrian airbag device S of the embodiment, when the airbag 48 is completely inflated, the lower surfaces 50a and 63a of the main body bag 49 and the road surface side bag 62 are both brought into contact with the road surface GL. When the inflation of the airbag 48 is completed, in addition to the frictional resistance generated between the road surface side bag 62 and the road surface GL, a frictional resistance is also generated between the main body bag 49 and the road surface GL. Since it acts so that a pedestrian can be restrained accurately when the person interferes with the airbag 48, the internal pressure of the airbag 48 can be relatively reduced, and the pedestrian can be protected with good cushioning properties. Can do.

特に、実施形態のエアバッグ装置Ｓでは、路面側バッグ６２が、外径寸法Ｄ２を、下面６３ａを路面ＧＬと接触させるとともに、前面６３ｅを膨張を完了させた本体バッグ４９の本体部５０の前面５０ｇと略鉛直方向に沿った面を構成するような寸法に、設定されていることから、膨張を完了させたエアバッグ４８と路面ＧＬとの間に生ずる隙間を最大限小さくすることができて、好ましい。例えば、図１２の三点鎖線に示すごとく、実施形態の路面側バッグ６２よりも外径寸法を大きく設定した路面側バッグ６２Ａを使用することも考慮できるが、このような路面用バッグ６２Ａを使用する場合、本体バッグ４９と路面ＧＬとの間に生ずる隙間ＳＰは、路面用バッグ６２と同様に埋めることができるが、路面側バッグ２７Ａの外径寸法が大きくなることから、路面側バッグ２７Ａ自体と路面ＧＬとの間に生ずる隙間が、路面用バッグ６２と比較して大きくなり、好ましくない。逆に、図１２の一点鎖線に示すごとく、路面側バッグ６２よりも外径寸法を小さくした路面側バッグ６２Ｂを使用する場合、本体バッグ４９の前面６０ｇ付近と路面ＧＬとの間に隙間が残ることから、この隙間に歩行者が侵入する虞れがあり、好ましくない。そのため、本体バッグ４９が下面５０ａを路面ＧＬと接触させるように膨張を完了させる実施形態のようなエアバッグ４８の場合、路面側バッグ６２の外径寸法Ｄ２を、下面６３ａを路面ＧＬと接触させるとともに、前面６３ｅを膨張を完了させた本体バッグ４９の本体部５０の前面５０ｇと略鉛直方向に沿った同一平面（同一接線）Ｌに接するような寸法に、設定することが望ましい。勿論、このような点を考慮しなければ、路面側バッグ６２Ａ・６２Ｂのごとく、膨張完了時の前面が、本体バッグの膨張完了時における前面より前方側、あるいは、後方側に配設させる構成の路面側バッグを配設させたエアバッグを使用してもよい。 In particular, in the airbag apparatus S of the embodiment, the road surface side bag 62 has the outer diameter D2, the lower surface 63a is in contact with the road surface GL, and the front surface of the main body portion 50 of the main body bag 49 in which the front surface 63e is completely inflated. Since the dimension is set so as to form a surface along the substantially vertical direction with 50 g, the gap generated between the airbag 48 that has been inflated and the road surface GL can be minimized. ,preferable. For example, as shown by a three-dot chain line in FIG. 12, it can be considered to use a road surface bag 62A having a larger outer diameter than the road surface bag 62 of the embodiment, but such a road surface bag 62A is used. In this case, the gap SP generated between the main body bag 49 and the road surface GL can be filled in the same manner as the road surface bag 62. However, since the outer diameter of the road surface side bag 27A becomes large, the road surface side bag 27A itself. The gap generated between the road surface GL and the road surface bag GL is larger than that of the road surface bag 62, which is not preferable. On the contrary, as shown by the one-dot chain line in FIG. 12, when the road surface bag 62B having a smaller outer diameter than the road surface bag 62 is used, a gap remains between the vicinity of the front surface 60g of the main body bag 49 and the road surface GL. Therefore, there is a possibility that a pedestrian may enter the gap, which is not preferable. Therefore, in the case of the airbag 48 as in the embodiment in which the main body bag 49 is inflated so that the lower surface 50a is brought into contact with the road surface GL, the outer diameter D2 of the road surface side bag 62 is made to contact the lower surface 63a with the road surface GL. At the same time, it is desirable to set the front surface 63e so as to be in contact with the front surface 50g of the main body portion 50 of the main body bag 49 that has been inflated and to be in contact with the same plane (same tangent) L along the substantially vertical direction. Of course, if such a point is not taken into consideration, the front surface when the inflation is completed is arranged on the front side or the rear side of the front side when the inflation of the main body bag is completed, as in the road side bags 62A and 62B. An airbag in which a road surface bag is disposed may be used.

また、エアバッグとして、図１３に示すごとく、膨張完了時に、路面側バッグ６２Ｃのみを路面ＧＬと接触させ、本体バッグ４９Ａを路面と接触させない構成のエアバッグ４８Ａを使用してもよい。このような構成のエアバッグ４８Ａでは、膨張完了時における本体バッグ４９Ａの前後方向の断面の外径寸法を、前述のエアバッグ装置Ｓのエアバッグ４８における本体バッグ４９より小さく設定することができて、エアバッグ４８Ａ全体の容積を小さくすることができる。その結果、インフレーター１６の出力増加を抑えることができる。 Further, as shown in FIG. 13, as shown in FIG. 13, an airbag 48 A having a configuration in which only the road surface side bag 62 C is brought into contact with the road surface GL and the main body bag 49 A is not brought into contact with the road surface when inflation is completed. In the airbag 48A having such a configuration, the outer diameter dimension of the cross section in the front-rear direction of the main body bag 49A when the inflation is completed can be set smaller than the main body bag 49 in the airbag 48 of the above-described airbag device S. The overall volume of the airbag 48A can be reduced. As a result, an increase in the output of the inflator 16 can be suppressed.

また、路面側バッグの数は１つに限られるものではなく、エアバッグを、本体バッグを路面と接触させない構成とする場合、複数の路面側バッグを配設させてもよい。具体的には、図１４に示すように、前後方向に沿って並設される２つの路面側バッグ７０・７０を、本体バッグ６９の下部側に配置させる構成のエアバッグ６８を使用してもよい。実施形態のエアバッグ６８では、路面側バッグ７０・７０は、相互に分離して形成され、図１５に示すごとく、それぞれ、連通用開口７１を介して、本体バッグ６９と連通されている。 Further, the number of road surface bags is not limited to one, and when the airbag is configured not to contact the main body bag with the road surface, a plurality of road surface bags may be provided. Specifically, as shown in FIG. 14, even if an airbag 68 having a configuration in which two road surface side bags 70 and 70 arranged side by side in the front-rear direction are arranged on the lower side of the main body bag 69 is used. Good. In the airbag 68 of the embodiment, the road surface bags 70 and 70 are formed separately from each other and communicated with the main body bag 69 via the communication opening 71 as shown in FIG.

さらには、図１６に示すように、前後方向に沿って並設される４つの路面側バッグ７８を、本体バッグ７５の下部側に配設させる構成のエアバッグ７４を使用してもよい。図１６のエアバッグ７４における４つの路面側バッグ７８は、実施形態の場合、一体的に構成されるもので、図１７・１８に示すごとく、本体バッグ７５の下部側に配設される１つの下部側バッグ７６を、左右方向に沿って部分的に配設されるとともに前後方向に沿って並設される複数の区画部７７で区画させ、相互に膨張用ガスを内部で移動可能に、構成されている。そして、前後方向の中央側に配設される２つの路面側バッグ７８Ｂ・７８Ｃに、本体バッグ７５に連通される連通用開口７９が形成され、前後両端側に配設される路面側バッグ７８Ａ・７８Ｄは、路面側バッグ７８Ｂ・７８Ｃを介在させて、区画部７７により区画されていない連通された部位から、膨張用ガスを流入させる構成である。連通用開口７９は、左右方向に沿った長円状とされて、各路面側バッグ７８Ｂ・７８Ｃの領域内において、それぞれ、左右方向に沿った５箇所に、配設されている。区画部７７は、下部側バッグ７６の上側布７６ａと下側布７６ｂとを、縫合若しくは接着等を利用して結合させることにより、構成されるもので、それぞれ、連通用開口７９の周縁となる位置において、左右方向に沿って、形成されている。図１６〜１８のエアバッグ７４に配設される路面側バッグ７８は、それぞれ、部分的に他の路面側バッグ７８と連結されているが、大部分を区画部７７により区画されていることから、膨張完了時に、前後方向の断面を略円形として、それぞれ、左右方向に沿った棒状として、膨張を完了させることとなる。 Furthermore, as shown in FIG. 16, an airbag 74 having a configuration in which four road surface side bags 78 arranged side by side along the front-rear direction may be disposed on the lower side of the main body bag 75 may be used. In the case of the embodiment, the four road surface side bags 78 in the airbag 74 of FIG. 16 are integrally configured. As shown in FIGS. 17 and 18, one road surface side bag 78 is disposed on the lower side of the main body bag 75. The lower side bag 76 is partitioned by a plurality of partitioning portions 77 that are partially disposed along the left-right direction and are arranged side by side along the front-rear direction, and the expansion gas can be moved inside each other. Has been. The two road surface bags 78B and 78C disposed on the center side in the front-rear direction are formed with communication openings 79 that communicate with the main body bag 75, and the road surface bags 78A and 78A disposed on both front and rear ends. 78D has a configuration in which inflation gas is introduced from a connected portion that is not partitioned by the partitioning portion 77 with the road surface side bags 78B and 78C interposed therebetween. The communication openings 79 are formed in an oval shape along the left-right direction, and are disposed at five locations along the left-right direction, respectively, in the regions of the road surface bags 78B and 78C. The partition part 77 is configured by joining the upper cloth 76a and the lower cloth 76b of the lower bag 76 by using stitching or adhesion, and each of them forms a peripheral edge of the communication opening 79. In the position, it is formed along the left-right direction. Each of the road surface side bags 78 disposed in the airbag 74 of FIGS. 16 to 18 is partially connected to another road surface side bag 78, but most of the road surface side bags 78 are partitioned by the partition portions 77. When the expansion is completed, the cross-section in the front-rear direction is substantially circular, and the expansion is completed as a bar shape along the left-right direction.

本発明の一実施形態である歩行者用エアバッグ装置が搭載された車両の概略部分側面図である。1 is a schematic partial side view of a vehicle equipped with a pedestrian airbag apparatus according to an embodiment of the present invention. 同実施形態の歩行者用エアバッグ装置が搭載された車両の概略正面図である。It is a schematic front view of the vehicle by which the airbag apparatus for pedestrians of the embodiment is mounted. 同実施形態の歩行者用エアバッグ装置が搭載された車両の概略部分平面図である。It is a general | schematic fragmentary top view of the vehicle by which the airbag apparatus for pedestrians of the embodiment is mounted. 同実施形態の歩行者用エアバッグ装置が搭載された車両の概略部分底面図である。It is a general | schematic partial bottom view of the vehicle by which the airbag apparatus for pedestrians of the embodiment is mounted. 同実施形態の歩行者用エアバッグ装置の概略縦断面図であり、図３のＶ−Ｖ部位に対応する。It is a schematic longitudinal cross-sectional view of the airbag apparatus for pedestrians of the embodiment, and respond | corresponds to the VV site | part of FIG. 同実施形態の歩行者用エアバッグ装置に使用するフレーム、ケース、インフレーター、及び、リテーナの概略分解斜視図である。It is a general | schematic disassembled perspective view of the flame | frame, case, inflator, and retainer which are used for the airbag apparatus for pedestrians of the embodiment. 同実施形態の歩行者用エアバッグ装置に使用するエアバッグの平面図である。It is a top view of the airbag used for the airbag apparatus for pedestrians of the embodiment. 同実施形態の歩行者用エアバッグ装置に使用するエアバッグの底面図である。It is a bottom view of the airbag used for the airbag apparatus for pedestrians of the embodiment. 同実施形態の歩行者用エアバッグ装置に使用するエアバッグの縦断面図であり、図７のIX−IX部位に対応する。It is a longitudinal cross-sectional view of the airbag used for the airbag apparatus for pedestrians of the embodiment, and respond | corresponds to the IX-IX site | part of FIG. 同実施形態の歩行者用エアバッグ装置の作動時を示す拡大概略縦断面図である。It is an expansion schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus for pedestrians of the embodiment. 同実施形態の歩行者用エアバッグ装置の作動時を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus for pedestrians of the embodiment. 同実施形態の歩行者用エアバッグ装置の作動時における、膨張を完了させたエアバッグと路面との接触部位付近を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the contact part vicinity of the airbag which completed the expansion | swelling, and the road surface at the time of the action | operation of the airbag apparatus for pedestrians of the embodiment. 本発明の他の実施形態である歩行者用エアバッグ装置の作動時を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus for pedestrians which is other embodiment of this invention. 本発明のさらに他の実施形態である歩行者用エアバッグ装置の作動時を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus for pedestrians which is further another embodiment of this invention. 図１５の歩行者用エアバッグ装置に使用するエアバッグの底面図である。It is a bottom view of the airbag used for the airbag apparatus for pedestrians of FIG. 本発明のさらに他の実施形態である歩行者用エアバッグ装置の作動時を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus for pedestrians which is further another embodiment of this invention. 図１６の歩行者用エアバッグ装置に使用するエアバッグの底面図である。It is a bottom view of the airbag used for the airbag apparatus for pedestrians of FIG. 図１６の歩行者用エアバッグ装置に使用するエアバッグの縦断面図であり、図１７のXVIII−XVIII部位に対応する。It is a longitudinal cross-sectional view of the airbag used for the airbag apparatus for pedestrians of FIG. 16, and respond | corresponds to the XVIII-XVIII site | part of FIG.

Explanation of symbols

１…車体、
１６…ケース、
４５…インフレーター、
４８…エアバッグ、
４９…本体バッグ、
５１…ガス流入用開口、
６２…路面側バッグ、
６４…連通用開口、
ＧＬ…路面、
ＳＰ…隙間、
Ｖ…車両、
Ｓ…歩行者用エアバッグ装置。 1 ... the car body,
16 ... case,
45 ... Inflator,
48 ... Airbag,
49 ... Body bag
51 ... Opening for gas inflow,
62 ... road side bag,
64 ... Opening for communication,
GL ... road surface,
SP ... Gap,
V ... Vehicle,
S: Air bag device for pedestrians.

Claims

The inflator is configured such that an airbag that can be inflated between the vehicle body and a road surface and an inflator that supplies inflation gas to the airbag are housed on the lower surface side of the vehicle body on the front side of the front wheel of the vehicle. A pedestrian airbag apparatus configured to inflate the airbag so that it can be prevented from being caught from the front side of the pedestrian during operation of
The airbag is
A main body bag that is connected to the inflator and has a substantially circular cross-sectional shape in the front-rear direction when inflation is completed,
A road surface that communicates with the main body bag and has a substantially circular cross-sectional shape in the front-rear direction when the inflation is completed, and is disposed so as to come into contact with the road surface at least on the lower side of the front end when the inflation is completed. A side bag,
Configured with
The road bag at the time of completion of inflating has an outer diameter dimension in a cross section in the front-rear direction set smaller than an outer diameter dimension in a cross section in the front-rear direction at the time of inflating the main body bag. Airbag device for the elderly.

The pedestrian airbag apparatus according to claim 1, wherein the airbag is configured so that only the road surface side bag is brought into contact with the road surface when inflation is completed.

2. The pedestrian airbag according to claim 1, wherein the airbag is configured to bring both the main body bag and the road surface bag into contact with the road surface when the inflation is completed. 3. apparatus.

The pedestrian airbag apparatus according to claim 2, wherein a plurality of the road surface bags are provided.