Pedestrian airbag system for a vehicle

Abstract

A pedestrian airbag system for a vehicle, comprising: an airbag housing (200) installed under a rear portion of a hood panel (H) of the vehicle, a gas generator (400) arranged within the airbag housing (200) in a central region, and an airbag cushion (100) having a pair of chambers, the chambers (120) being arranged inside the airbag housing (200) and on respective sides of the gas generator (400), wherein the pair of chambers is connected to the gas generator (400) to be supplied with the gas from the gas generator (400), and is inflated upon explosion of the gas generator (400) to be ejected from the hood panel (H), and covers A-pillars (A) arranged on respective sides in a width direction of a vehicle body, wherein the pair of chambers is arranged at respective side positions of the airbag cushion (100) and a connecting part (140) is arranged between the chambers (120) to connect the chambers (120) to each other, and wherein the gas generator (400) is connected to a central portion of the connecting part (140) to supply gas to the connecting part (140), and wherein a supply line (142) is arranged inside the connecting part (140), a central section of the supply line (142) is connected to the gas generator (400) to supply the line (142) with the gas from the gas generator (400), and the chambers (120) are supplied with the gas through the respective ends of the supply line (142), wherein a pair of flaps (260) are provided in respective side portions of a front surface of the airbag case (200) to correspond to the chambers (120) so that the flaps (260) are torn open when the chambers (120) are inflated.

Description

Background of the inventionField of the invention

[0001] The present invention relates generally to a gas generator (e.g., an airbag gas generator) and a cushion part of a pedestrian airbag module that is deployed (e.g., triggered) in a vehicle (e.g., a motor vehicle), and more particularly to a pedestrian airbag system for a vehicle structured such that a gas generator deploys two cushions provided for A-pillars. Description of the technology used

[0002] The present invention relates to a technology related to the structure of a pedestrian airbag module for a vehicle. A pedestrian airbag is used to effectively protect a pedestrian's head when a vehicle collides with a pedestrian and the pedestrian's head is likely to hit the hood or cowl of a vehicle. A pedestrian airbag works by having a sensor installed in a bumper detect a pedestrian and emit a detection signal, causing an airbag mounted at a lower end (e.g., a bottom part) of the hood of a vehicle to deploy.

[0003] The purpose of a pedestrian airbag is to prevent a pedestrian's head from directly impacting a hard area such as a cowl or front pillar of a vehicle.

[0004] Generally, a conventional pedestrian airbag consists (among other things) of a large cushion that is inflated to be fully exposed (e.g., uncovered) outside a vehicle. For this reason, conventional pedestrian airbags have the problem that the cushion has a large volume and the gas generator must have a large capacity.

[0005] In addition, conventional pedestrian airbags must be equipped with a pair of gas generators if only one A-pillar part is protected individually, which increases the raw material costs.

[0006] The above information disclosed in this Background section is provided merely to facilitate understanding of the general background of the invention and should not be considered as an admission or any suggestion that this information forms part of the prior art as already known to those skilled in the art.

[0007] From US 2010 / 0 300 792 A1, a pedestrian airbag system for a vehicle is known, comprising: an airbag housing installed under a rear portion of a hood panel of the vehicle, a gas generator arranged inside the airbag housing in a central region, and an airbag cushion having a pair of chambers, the chambers being arranged inside the airbag housing and on respective sides of the gas generator, the pair of chambers being connected to the gas generator to be supplied with the gas from the gas generator and being inflated upon explosion of the gas generator to be ejected from the hood panel, and respectively covering A-pillars arranged on respective sides in a width direction of a vehicle body, the pair of chambers being arranged at respective side positions of the airbag cushion, and a connecting part being arranged between the chambers to connect the chambers to each other. connect,and wherein the gas generator is connected to a central portion of the connecting part to supply gas to the connecting part, and wherein a supply line is arranged inside the connecting part, a central portion of the supply line is connected to the gas generator to supply the line with the gas from the gas generator, and the chambers are supplied with the gas through the respective ends of the supply line.

[0008] Furthermore, from DE 10 2006 033 670 A1 a vehicle with a collision object protection device is known, wherein the collision object protection device inflates and expands an airbag on a vehicle when a collision is detected or predicted with respect to the vehicle, wherein the vehicle has a windshield which is formed from a layered glass consisting of a pair of transparent base materials between which a transparent intermediate film is arranged, wherein the airbag has two support regions which are inflated and expanded along the front supports of the vehicle, and the intermediate film in the windshield has a sound insulation property.

[0009] Furthermore, DE 103 41 368 A1 discloses a further safety device on a motor vehicle for protecting pedestrians and cyclists, comprising at least one airbag arranged under the hood and connected to a gas generator, which airbag deploys to protect a pedestrian or cyclist colliding with the vehicle. Furthermore, DE 10 2011 119 564 A1 discloses a pedestrian protection system on a motor vehicle for the area of ​​the windshield and its flanking A-pillars. This system has flaps designed to establish a connection between individual chambers after the gas generator is triggered. Further safety and protection devices on motor vehicles are known from DE 603 ​​15 210 T2 and JP 2004 - 076 542 A. Explanation of the invention

[0010] It is an object of the present invention, among others, to provide a pedestrian airbag for a vehicle which is structured so that one (e.g. single) gas generator deploys two A-pillar cushions.

[0011] For this purpose, the present invention provides a pedestrian airbag system for a vehicle according to claim 1 and its advantageous developments according to the dependent claims

[0012] In one aspect of the present invention, a pedestrian airbag for a vehicle comprises: an airbag case installed under a rear portion of a hood panel (e.g., hood panel) of the vehicle, an inflator disposed inside the airbag case at a central region, and an airbag cushion having a pair of chambers, the chambers being disposed inside the airbag case and on respective sides of the inflator, the pair of chambers being connected to the inflator to be supplied with gas from the inflator, and inflated upon explosion of the inflator to be ejected from the hood panel (e.g., partially or sectionally), thus covering A-pillars disposed on respective sides in a width direction of a vehicle body.The pair of chambers are arranged at respective side positions of the airbag cushion, and a connecting part may be arranged between the chambers to connect the chambers to each other. The inflator is connected to a central portion of the connecting part to supply gas to the connecting part. A supply line is arranged inside the connecting part, a central portion of the supply line is connected to the inflator to supply the line with the gas from the inflator, and the chambers are supplied with the gas through the respective ends of the supply line. A pair of flaps are provided in respective side portions of a front surface of the airbag case to correspond to the chambers, so that the flaps are torn open when the chambers are inflated.

[0013] The connecting part and the chamber pair may be connected to communicate with each other (e.g. fluid communication) and may form a continuous channel.

[0014] The chambers may have an elongated shape and each extend along respective (e.g. corresponding) A-pillars, the chambers may be arranged in side sections within the airbag housing in the folded state, the connecting part may connect the chambers to one another, wherein or while the connecting part is arranged within the airbag housing, the gas generator may be arranged within the airbag housing in a central region and the gas generator may be connected to the central section of the connecting part.

[0015] An interior (e.g., an inside) of each chamber may be provided with barriers (e.g., partitions or dividing walls) extending in a longitudinal direction thereof, and the interior of each chamber may be divided by the barriers into a plurality of channels extending in the longitudinal direction.

[0016] An outer belt may be provided with a first end connected to a chamber and a second end fixedly connected to any one of the airbag housing, the hood panel, and the vehicle body, wherein upon deployment of the chamber, the outer belt pulls the chamber inward to prevent the chamber(s) from moving away from the vehicle body (in other words, the chambers from diverging towards the outside of the vehicle body).

[0017] There may be two outer belts each corresponding to the pair of chambers, upper ends of the outer belts may be connected to the respective (e.g., corresponding) chambers, lower ends of the outer belts may extend to approach each other, and they may be fixedly connected to any one of the airbag housing, the hood panel, the connecting part, and the vehicle body, and the two outer belts may have a V-shape.

[0018] The pedestrian airbag system for a vehicle according to the present invention has the advantage that two side chambers are deployed simultaneously by means of one (e.g., single) gas generator, which reduces the number of gas generators used compared to conventional airbag systems and results in a reduction in the volume of the pedestrian airbag.

[0019] In addition, since the shape of the cushions deployed in an A-pillar part is securely maintained, the pedestrian airbag system for a vehicle has improved reliability.

[0020] Other aspects and preferred embodiments of the invention are discussed below.

[0021] It is understood that the terms "vehicle" or "vehicle-" or other similar terms as used herein are inclusive of general motor vehicles such as passenger vehicles including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and include hybrid vehicles, electric vehicles, plug-in hybrid vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more power sources, for example, both gasoline-powered and electric-powered vehicles.

[0022] The methods and apparatus of the present invention have other features and advantages which will be apparent from, or set forth in more detail in, the accompanying drawings incorporated herein and the following detailed description, which together serve to explain certain principles of the present invention. Explanation of the drawings Fig. 1 is a view illustrating a deployed state of a pedestrian airbag system for a vehicle according to various exemplary embodiments of the present invention. The Fig. 2A to 2C are exploded perspective views illustrating the pedestrian airbag system for the vehicle according to various exemplary embodiments of the present invention. The Fig. 3 to 7 are views illustrating the pedestrian airbag system for the vehicle according to various exemplary embodiments of the present invention. Fig. 8 is a view illustrating an airbag housing of a pedestrian airbag system for a vehicle according to various exemplary embodiments of the present invention.

[0023] The reference numerals shown in the drawings include a reference to the following elements as explained below.

[0024] It should be understood that the accompanying drawings are not necessarily to scale and present a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the particular intended application and environment of use.

[0025] In the figures, the (same) reference numerals refer to the same or equivalent components of the present invention throughout the various figures of the drawing. Detailed description

[0026] Reference will now be made in detail to the various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with the exemplary embodiments, it will be understood that the present description is not intended to limit the invention(s) to these exemplary embodiments. On the contrary, the invention(s) are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, alterations, and other embodiments falling within the spirit and scope of the invention(s) as defined by the appended claims.

[0027] Hereinafter, an exemplary embodiment of the present invention will be explained with reference to the accompanying drawings so that a person skilled in the art to which the present invention relates can carry out the exemplary embodiment.

[0028] Fig. 1 is a view illustrating a deployed state of a pedestrian airbag system for a vehicle according to a first embodiment. Fig. 2A to 2C are exploded perspective views illustrating the pedestrian airbag system for the vehicle according to the first embodiment. Fig. 3 to 7 are views illustrating the pedestrian airbag system for the vehicle according to various exemplary embodiments; and Fig. 8 is a view illustrating an airbag housing of a pedestrian airbag system for a vehicle according to any one of the exemplary embodiments of the present invention.

[0029] The pedestrian airbag system for a vehicle according to the embodiment of the present invention comprises: an airbag housing 200 mounted under a rear portion (or part) of a hood panel (or hood panel) H of a vehicle, an inflator 400 arranged within the airbag housing 200 in a central portion, and an airbag cushion 100 having a pair of chambers (120), wherein the chambers (120) are arranged on respective sides of the inflator 400 and within the airbag housing 200, are supplied with gas by connection with the inflator 400, and are inflated upon explosion of the inflator 400 to be ejected from the hood panel H (in other words, are inflated to the outside of the hood panel H upon explosion of the inflator 400), thus respectively Cover A-pillars A.

[0030] Fig. 1 illustrates a deployed state of the pedestrian airbag system for a vehicle according to the first embodiment. When a vehicle collides with a pedestrian, the hood panel H is lifted, and the pair of chambers 120 are deployed to be ejected from the underside of the rear end of the hood panel H. The chambers 120 are deployed from respective sides of the hood panel H, thus covering the A-pillars A, respectively. Accordingly, it is possible to prevent the pedestrian's head from directly impacting the A-pillar A, thereby preventing injury to the pedestrian.

[0031] In particular, the Fig. 2A to 2C are exploded perspective views of the pedestrian airbag system according to the first embodiment. Referring to the Fig. 2A to 2C, the airbag housing is installed under the rear portion of the hood panel H. The airbag housing is attached directly to a lower surface of the hood panel H or installed within a cowl.

[0032] There is only one (e.g., single) gas generator, and the gas generator is installed within the airbag housing 200 in a central portion. Upon receiving a deployment signal, the gas generator 400 explodes and generates a gas. The pair of chambers (120) is arranged within the airbag housing 200. The chambers 120 are arranged on both sides of the gas generator 400 and are connected to the gas generator 400 so that the chambers 120 can be supplied with gas from the gas generator 400. When the gas generator 400 explodes, the chambers 120 are inflated to be ejected from the hood panel H and cover the A-pillars A.

[0033] In particular, as in Fig. 3 illustrates an airbag cushion 100 formed from the pair of chambers 120 and a connecting part 140 that connects the chambers 120. The gas generator 400 is connected to a central portion of the connecting part 140 to supply the gas to the connecting part 140.

[0034] That is, the cushion 100 has the chambers 120 and the connecting part 140 which connects the chambers 120 to each other, the connecting part 140 is supplied with the gas from the gas generator 400 and transfers the gas into the chambers 120, and the chambers 120 are inflated by the supplied gas.

[0035] With this structure, it is possible to inflate two chambers 120 using only one gas generator 400. Furthermore, since the chambers 120 are inflated at positions corresponding to the A-pillars A, respectively, the volume of the cushion 100 is reduced, and the number of gas generators and the capacity of one gas generator 400 are also reduced.

[0036] Furthermore, since the connecting part 140 merely functions as a connecting piece to connect the chambers 120 to each other, the airbag housing 200 occupies a small installation space. Accordingly, the structure of the pedestrian airbag system is advantageous for a vehicle in terms of packaging (e.g., installation space). Fig. 8 is a view illustrating an airbag housing 200 of a pedestrian airbag system for a vehicle according to another exemplary embodiment. Referring to Fig. 8, flaps (or door pieces) 260 are arranged in the front surface of the airbag housing 200, and the flaps 260 are torn open when the chambers 120 are inflated. Since the chambers 120 are arranged within the airbag housing 200 in respective side portions, a pair of flaps (260) is provided to correspond to the chambers 120. Since the volume of a central portion 280 of the airbag housing 200 is reduced, interference (e.g., interference) with other components of a vehicle by the airbag housing 200 can be avoided.

[0037] As in Fig. As illustrated in Figure 3, the connecting part 140 and the pair of chambers 120 are connected to each other to communicate (e.g., fluidly connect), thus forming a gas circulation channel. The connecting part 140 and the pair of chambers 120 are made of the same material (e.g., fabric) to form a (e.g., single) cushion. In this case, since the chambers 120 and the connecting part 140 are united (e.g., form one part, in other words, are integrally formed) to function as a (e.g., single) cushion, manufacturing is easy and raw material costs can be reduced. Furthermore, the process of connecting the chambers 120 to the connecting part 140 can be omitted.

[0038] Even in this case, the connecting part 140 does not protrude to the outside when the cushion is deployed because it is hidden behind a rear end portion of the hood, and only the chambers 120 are inflated to be ejected from the hood and cover the A-pillars A, respectively.

[0039] As in Fig. 4, a supply line (e.g., a supply pipe) 142 is installed in the connecting part 140. A central portion of the supply line 142 is connected to the inflator 400, so that the gas is first supplied to the supply line 142 and then to the chambers 120 through the respective ends of the supply line 142. In this case, the supply line 142 is formed separately and then installed within the connecting part 140. With this structure, the gas is supplied to the chambers 120 earlier than it is supplied to the connecting part 140, so that the chambers 120 are quickly expanded. In addition, after the chambers 120 are inflated, the connecting part 140 is inflated later. Accordingly, the supply line 142 can be protected from external impacts.

[0040] Alternatively, as in Fig. 5 illustrates, the connecting part 140 may have a tubular shape that connects the chambers 120 to each other. A central portion of the connecting part 140 is connected to the inflator 400 so that it is supplied with gas from the inflator 400. The gas supplied to the central portion of the connecting part 140 then flows through respective ends of the connecting part 140 into the chambers. The connecting part 140 may be a steel tube. In this case, the connecting part 140 is not inflated, but the chambers 120 are inflated. This structure can save unnecessary installation space occupied by an inflated connecting part and can also reduce the amount of gas required to inflate an airbag.

[0041] Each chamber 120 has a shape that extends along the respective (e.g., corresponding) A-pillar A. The chambers 120, when folded, are arranged within respective side portions of the airbag housing 200. The connecting part 140 connects the chambers 120 to each other and is also arranged inside the airbag housing 200. The gas generator 400 is arranged inside the airbag housing 200 in a central portion, and the gas generator 400 and a central portion of the connecting part 140 can be connected to each other.

[0042] The interior of each chamber 120 may be equipped with barriers (e.g., partition walls or dividers) 122 extending along the longitudinal direction of the chamber 120. The interior of the chambers 120 is divided into a plurality of channels by the barriers 122. This structure prevents each chamber 120 from shaking in a left and right direction when a vehicle moves after the chambers 120 are inflated or when a vehicle collides with a pedestrian, and causes the chambers 120 to remain close to the A-pillars, respectively. The channels defined by the barriers 122 extend longitudinally, so the chambers 120 do not move sideways.

[0043] A pedestrian airbag system for a vehicle according to a second exemplary embodiment comprises: an airbag housing 200 mounted under a rear portion of a hood panel H of a vehicle, a gas generator 400 disposed within the airbag housing 200 in a central portion, an airbag cushion 100 having a pair of chambers (120), the chambers 120 being disposed within the airbag housing 200 on respective sides of the gas generator 400, being supplied with gas by connection with the gas generator 400, and being inflated upon explosion of the gas generator 400 to be ejected from the hood panel H and thus covering A-pillars A disposed on respective sides of a vehicle, and an outer belt (e.g.A tether or tensioning strap 600 is connected at its first end to the chamber 120 and at its second end to any one of the airbag housing 200, the hood panel H, and a vehicle body. With this structure, upon deployment of the chambers 120, the outer strap 600 pulls the chambers 120 inward to prevent the chamber(s) 120 from moving away from the body of a vehicle (in other words, the chambers from diverging toward the outside of a vehicle body).

[0044] A pedestrian airbag system for a vehicle according to a third exemplary embodiment includes: an airbag housing 200 installed under a rear portion of a hood panel H of a vehicle, an inflator 400 disposed within the airbag housing 200 in a central portion, an airbag cushion 100 having a pair of chambers (120) and a connecting member 140 connecting the chambers 120 to each other, the chambers 120 being disposed on respective sides of the inflator 400 and within the airbag housing 200, being supplied with gas by connection with the inflator 400, and being inflated upon explosion of the inflator 400 to be ejected from the hood panel H, thereby covering the A-pillars A respectively, and an outer belt (e.g.A retaining or tensioning strap 600 is connected at its first end to the chamber 120 and at its second end to any one of the hood panel H, the connecting part 140, and a vehicle body. The outer strap 600, upon deployment of the chambers 120, pulls the chambers 120 inward to prevent the chamber(s) 120 from moving away from the body of a vehicle (in other words, the chambers from diverging toward the outside of the vehicle body).

[0045] There may be a pair of outer belts (600), wherein the outer belts 600 each correspond to the chambers 120. Upper ends of the outer belts 600 are each connected to the respective (e.g., corresponding) chambers 120. Lower ends of the outer belts 600 gather (or are brought together) and are connected to any one of the airbag housing 200, the hood panel H, and the connecting part 140. That is, the pair of outer belts (600) takes the shape of the letter "V."

[0046] The Fig. 6 and Fig.7 are views illustrating the structure of the outer belts 600. The upper ends of the outer belts 600 are connected to the upper ends of the chambers 120 facing the outer belts 600, and the lower ends of the outer belts 600 can be fixed to the body of a vehicle. This arrangement prevents the chambers 120 from being excessively expanded outward, thereby preventing the chambers 120 from diverging from the body of a vehicle. Since, when the chambers 120 are deployed, the chambers 120 are deployed in directions in which a distance between the chambers 120 would widen (e.g., toward the outside of the vehicle), the outer belts 600 restrict this widening.The effect of restricting the widening of a distance between the chambers 120 can be achieved when lower ends of the pair of outer belts 600 are firmly connected to any one of the airbag case 200, the hood panel H, the connecting part 140, and the body of a vehicle, which are a fixed structure. The outer belts 600 are arranged in the shape of the letter "V" with the lower ends remaining close to each other. This arrangement prevents the upper ends of the chambers 120 from being excessively moved apart, thereby preventing the chambers 120 from moving apart from the body of a vehicle (e.g., toward the outside of the vehicle body).

[0047] According to the pedestrian airbag system for a vehicle having the above-mentioned structure, since the chambers arranged on respective sides of a vehicle body can be deployed simultaneously by means of one (e.g., single) inflator, it is possible to reduce the number of inflators and to reduce the capacity of the inflator.

[0048] In addition, since the shape of the cushions deployed near the A-pillars is safely maintained, the reliability of an airbag is improved.

[0049] Although a preferred embodiment of the present invention has been described for illustrative purposes, one skilled in the art will understand that numerous modifications, additions and substitutions are possible without departing from the scope and spirit of the invention as disclosed in the appended claims.

[0050] For simplicity of description and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments with reference to the positions of such features as shown in the figures.

[0051] The foregoing descriptions of the specific exemplary embodiments of the present invention are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, and to thereby enable those skilled in the art to make and use the various embodiments of the present invention, as well as numerous alternatives and modifications thereof. It is intended that the scope of the invention be defined by the appended claims.

Claims

[1] A pedestrian airbag system for a vehicle, comprising: an airbag housing (200) installed under a rear portion of a hood panel (H) of the vehicle, a gas generator (400) arranged within the airbag housing (200) in a central region, and an airbag cushion (100) having a pair of chambers, the chambers (120) being arranged inside the airbag housing (200) and on respective sides of the gas generator (400), wherein the pair of chambers is connected to the gas generator (400) to be supplied with the gas from the gas generator (400), and is inflated upon explosion of the gas generator (400) to be ejected from the hood panel (H), and covers A-pillars (A) arranged on respective sides in a width direction of a vehicle body, wherein the pair of chambers is arranged at respective side positions of the airbag cushion (100) and a connecting part (140) is arranged between the chambers (120) to connect the chambers (120) to each other, and wherein the gas generator (400) is connected to a central portion of the connecting part (140) to supply gas to the connecting part (140), and wherein a supply line (142) is arranged inside the connecting part (140), a central section of the supply line (142) is connected to the gas generator (400) to supply the line (142) with the gas from the gas generator (400), and the chambers (120) are supplied with the gas through the respective ends of the supply line (142), wherein a pair of flaps (260) are provided in respective side portions of a front surface of the airbag case (200) to correspond to the chambers (120) so that the flaps (260) are torn open when the chambers (120) are inflated. [2] The pedestrian airbag system according to claim 1, wherein the connecting part (140) and the pair of chambers are connected to communicate with each other and form a continuous channel. [3] The pedestrian airbag system according to one of claims 1 and 2, wherein the chambers (120) have an elongated shape and each extend along respective A-pillars (A), the chambers (120) are arranged in side sections within the airbag housing (200) in the folded state, the connecting part (140) connects the chambers (120) to each other, the connecting part (140) being arranged within the airbag housing (200), the gas generator (400) is arranged within the airbag housing (200) in a central region and the gas generator (400) is connected to the central section of the connecting part (140). [4] The pedestrian airbag system according to any one of claims 1 to 3, wherein an interior of each chamber (120) is provided with barriers (122) extending in a longitudinal direction thereof, and the interior of each chamber (120) is divided by the barriers (122) into a plurality of channels extending in the longitudinal direction. [5] The pedestrian airbag system according to claim 1, comprising: an outer belt (600) having a first end connected to a chamber (120) and a second end fixedly connected to any one of the airbag housing (200), the hood panel (H), and the vehicle body, wherein upon deployment of the chamber (120), the outer belt (600) pulls the chamber (120) inward to prevent the chamber (120) from moving away from the vehicle body. [6] The pedestrian airbag system according to claim 5, wherein there are two outer belts (600) each corresponding to the pair of chambers, upper ends of the outer belts (600) are each connected to the respective chambers (120), wherein lower ends of the outer belts (600) extend so as to approach each other and are fixedly connected to any one of the airbag housing (200), the hood panel (H), the connecting part (140) and the vehicle body, and whereby the two outer belts (600) take a V-shape.

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