JP2005096560A - Air bag for asistant driver's seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag for an asistant driver's seat capable of simplifying a folding step of the air bag and obtaining sufficient expansion/deployment characteristics of the air bag. <P>SOLUTION: The air bag for the asistant driver's seat is constituted such that an upper part and a lower part of an air bag body (11) comprising a cloth bag having a gas introduction port (13c) connected to a gas generation port of an inflator (8) are flatly superposed and folded and both left/right sides of the air bag body (11) are folded in the state where they are spaced with a required dimension gap from the gas introduction port (13c) to both left/right side directions. Thereby, the space between both left/right sides of the air bag body (11) can be formed as a flat gas guide part (14) for directly introducing/guiding the gas generated from the inflator (8) toward the occupant. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an airbag attached to a vehicle such as an automobile, and more particularly, to an airbag for a passenger seat attached to an instrument panel disposed in front of the passenger seat.

  Conventionally, for example, when a vehicle receives a large impact of a predetermined level or more, it operates by detecting the impact, introduces gas into the airbag, instantly inflates the airbag, and the upper body of the passenger by the airbag. An air bag module that cushions and supports the body and greatly reduces the impact force applied to the human body has been put into practical use. As a standard equipment, this airbag module is mounted not only on the center of the steering wheel in front of the driver but also on the instrument panel in front of the passenger seat.

  The appropriate inflation speed and inflation / deployment configuration of the airbag in this type of airbag module are greatly affected by the folding configuration of the airbag itself. For this reason, various improvements have conventionally been made with respect to the folded state of the airbag (see, for example, Patent Document 1).

  As shown in FIG. 7, the airbag described in Patent Document 1 shows a passenger seat airbag that is mounted in an instrument panel in front of a passenger seat of an automobile. The airbag 100 shown in FIG. 7 includes an occupant side wall 111 arranged along a substantially vertical direction when deployment and inflation are completed, and a peripheral wall that narrows in a substantially conical shape from the outer peripheral edge of the occupant side wall 111 toward the vehicle front side. Part 112. A gas inlet 113 is formed in the lower front portion of the peripheral wall 112, and the periphery of the gas inlet is connected and fixed to a gas generating port of the inflator.

  The conventional airbag 100 is pre-folded, then horizontally folded and vertically folded, and stored in the instrument panel. As shown in FIGS. 8A and 8B, the pre-folded airbag 100 is arranged in a position near the upper edge 114 in the occupant side wall portion 111 at a position facing the gas inlet 113, and the occupant side wall portion. The rear end portion 115 and the left and right side portions 116 of the airbag 100 are folded into the airbag 100 in multiple stages in a state where substantially the entire region 111 is flattened on the peripheral wall portion 112.

  The airbag 100 folded sideways has a rear end portion 115 of the prefolded airbag 100 folded in a roll shape on the occupant side wall portion 111 and a front end portion 117 folded in a bellows shape on the occupant side wall portion 111. The vertically folded airbag 100 has the left and right side portions 116 of the horizontally folded airbag 100 folded in a bellows shape on the occupant side wall 111.

  In this conventional airbag 100, the airbag 100 is folded in a state in which a portion near the upper edge 114 in the occupant side wall 111 is disposed at a position facing the gas inlet 113 when the airbag 100 is pre-folded. For this reason, in the initial stage of air bag deployment and inflation, the gas pressure G generated from the gas generating port of the inflator is directly applied to a portion near the upper edge 114 in the occupant side wall portion 111 disposed facing the gas inlet 113. Will act.

In the process of deploying and inflating the airbag 100, the vicinity of the upper edge 114 in the occupant side wall 111 can be strongly pushed upward by the pressing force F of the gas pressure G. Prior to this, the vicinity of the upper edge 114 in the occupant side wall 111 can be quickly deployed along the substantially vertical direction. As the occupant side wall 111 is pushed up, lateral folds and vertical folds of the occupant side wall 111 and the peripheral wall 112 can be quickly eliminated, and the airbag 100 is wide open vertically and horizontally. It can be expanded with.
JP 2002-255004 A

  As described above, the folding configuration of the passenger seat airbag 100 described in Patent Document 1 is such that substantially the entire region of the passenger side wall 111 can be folded flatly, The left and right side portions 116 are pre-folded into the airbag 100 in a bellows shape.

  The conventional airbag 100 has a problem in that complicated folding work steps are increased when the airbag 100 is pre-folded, and production efficiency is deteriorated and work costs are easily increased. As the folding work increases, it becomes difficult to automate the folding of the airbag 100 and the manufacturing cost also increases.

  In this conventional airbag 100, when the airbag 100 is pre-folded, the rear end portion 115 and the left and right side portions 116 of the airbag 100 are folded in a bellows shape toward the airbag 100. Between the formed folding portions, gas passages for guiding the gas flow in the rear and left and right directions of the gas inlet 113 are formed to communicate with each other in a plurality of stages.

  In the conventional inflation and deployment of the airbag 100, first, a portion near the upper edge of the occupant side wall 111 of the airbag 100 is inflated upward. When the occupant side wall 111 is pushed up, the folds or the like of the occupant side wall 111 and the peripheral wall 112 are quickly eliminated. However, since a smooth gas flow is generated only when the respective folded portions formed in the airbag 100 communicate with each other, depending on the amount of gas discharged from the inflator, the gas flow toward the passenger of the airbag 100 may be It may be suppressed for a moment.

  In this conventional airbag 100, the vicinity of the upper edge of the occupant side wall 111 is strongly pushed upward by the pressing force F of the gas pressure G in the process of inflating and deploying the airbag 100. Excessive pressing force at the time of pushing up is applied to the vicinity of the upper edge of the portion 111. However, there has been a problem that the gas discharge amount of the inflator must be controlled so that the base fabric of the passenger side wall portion 111 that first contacts the hot gas generated from the inflator is not directly affected by the hot gas of the inflator. .

  In order to promote the gas flow toward the occupant direction of the airbag 100 as a whole in the process of inflation and deployment of the airbag 100, the loss of the supply gas from the inflator is eliminated, and the required amount of gas is used for the inflation of the airbag 100. It is preferable to be used efficiently.

  In general, it is required to control the gas pressure, the inflation speed of the entire airbag, the gas flow direction, and the like necessary for the deployment operation of the airbag and the release of the folded configuration. Unless these requirements are satisfied, a smooth inflation and deployment operation of the airbag cannot be expected.

  The present invention has been made to solve the above-described conventional problems, and a specific object thereof is to simplify the airbag folding process and to obtain a favorable expansion and deployment characteristic of the airbag. An object is to provide an airbag for a passenger seat.

  The invention according to claim 1 is an airbag for a passenger seat disposed in an instrument panel, wherein the airbag comprises a cloth bag having a gas introduction port connected to a gas generation port of an inflator. The airbag main body has an upper portion and a lower portion that are overlapped with each other in a flat shape and folded, and the right and left side portions of the airbag main body are spaced apart from each other by the required distance in the left and right directions from the gas inlet. The gas flow path is formed with the required dimensional interval as a gas flow path, and the gas flow path directs the flow of gas introduced from the gas inlet at the time of airbag inflation and deployment to the occupant. An airbag for a passenger seat is characterized in that it comprises a flat gas guide part for direct introduction and guidance.

  The invention according to claim 2 is the invention according to claim 1, characterized in that the gas introduction port is arranged at one end of the gas guide part.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein at least between the upper part and the lower part of the airbag body is folded in a bellows shape toward the gas inlet. It is characterized by.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the airbag body is further folded on the gas inlet after the left and right sides of the airbag body are folded. It is characterized by being.

  In the present invention, when the airbag body is initially folded, the upper and lower portions of the base fabric constituting the airbag body are overlapped with each other to form a flat shape. Folding is performed in a state of being spaced apart in the direction with a required dimension interval, and the required dimension interval is formed as a gas flow path. The gas flow path between the left and right side portions of the airbag body is formed as a flat gas guide portion that directly introduces and guides the flow of gas introduced from the gas introduction port toward the occupant when the airbag is inflated and deployed. Can do.

  When the vehicle receives a large impact greater than or equal to a predetermined value, the impact is detected and the inflator is activated, high-pressure gas is introduced from the gas inlet to the gas guide, and the entire airbag is inflated instantaneously. In the initial stage of inflation of the airbag, the high pressure gas introduced from the gas introduction port to the gas guide part spreads in the direction in which the length of the gas guide part is long, and the gas guide part is inflated and deployed. it can. Along with the inflation and deployment of the gas guide portion, the inflation and deployment of the left and right side portions of the airbag body in the vertical and horizontal directions can be expanded gently and smoothly.

  When the airbag is inflated and deployed, after the high-pressure gas is discharged from the gas inlet into the gas guide portion, the left and right side portions of the airbag body are actively inflated. For this reason, it spreads with the wide expansion surface substantially parallel with respect to a passenger | crew, and the ideal expansion | deployment speed | velocity | deployment speed | velocity | rate, expansion | swelling / deployment form, etc. effective in relieving the impact which a passenger | crew receives are obtained effectively.

  In addition, the gas flow path toward the occupant in the airbag main body in a simple form without folding a special shape regulating member or gas guiding means independently of the configuration base fabric of the airbag main body. Can be formed. Therefore, the folded airbag body can be stably formed, and variations in the inflation and deployment characteristics of the airbag body folded in an airtight manner are reduced.

  In addition, when forming a flat gas guide in the airbag body as a gas flow path toward the occupant, it can be folded in a simple folding form without increasing the folding process of the airbag body. Can be done. Thereby, it becomes possible to automate the folding of the airbag body, and the working efficiency can be remarkably improved.

  According to the present invention, it is effective that the gas inlet is disposed at one end of the gas guide. Since the gas introduction port connected to the gas generation port of the inflator can be disposed in the gas guide portion, the pressure loss of the inflator can be reduced. A small inflator having a relatively small gas output can be used, and the total weight of the airbag module can be reduced.

  The high pressure gas generated from the inflator in the airbag main body is once flowed out in the direction in which the length of the gas guide portion is long, and the gas guide portion is first inflated, whereby the first air bag expansion form is changed to the gas guide portion. It can be determined by the expansion form. Since the high temperature generated gas is introduced into the left and right side portions of the airbag body after passing through the gas guide portion, the constituent fabric of the airbag body can be less affected by the high temperature gas.

  Further, in the present invention, it is effective to fold at least between the upper part and the lower part of the airbag body in a bellows shape toward the gas inlet. The folding waveform and folding height of the airbag body can be made constant. In the subsequent folding process, a compact folded shape can be obtained without being bulky, and it can be easily and reliably attached to the storage container formed in the instrument panel.

  Furthermore, according to the present invention, it is preferable that the left and right side portions of the airbag body are folded in a state of being spaced apart from the gas inlet port in the left and right side directions with a predetermined dimensional interval, and further folded on the gas inlet port.

  Since the left and right sides of the airbag body are folded away from the gas inlet port in the left and right sides with the required dimensional spacing, the base fabrics stacked between the left and right sides of the airbag body are in close contact with each other. Without it, the airbag body can be folded onto the gas inlet. As a result, a gas flow path having a required dimensional interval can be formed between the left and right side portions of the airbag body, and high-pressure gas can be inflated and deployed quickly and smoothly toward the occupant. Become.

  Moreover, since the space between the left and right side portions of the airbag body is folded toward the gas inlet, the gas pressure introduced from the gas inlet can be well dispersed in the periphery, and the gas flow is good. Become. The gas pressure can be applied smoothly and quickly to the outer peripheral portion of the constituent base fabric, and the airbag main body can be widely inflated and deployed toward the occupant direction.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. In the following description, the front side of the instrument panel is referred to as a rear portion, the rear side is referred to as a front portion, and the instrument panel is referred to as up, down, left, and right when viewed from the front.

  As shown in FIG. 6, the airbag device for a passenger seat applied to the present invention is covered with an airbag grid 3 in an opening provided on an upper surface of a portion of the instrument panel 1 facing the passenger seat of the fascia 2. Attached. Reference numeral 4 denotes a front windshield, and reference numeral 5 denotes an airbag module.

  FIG. 1 is a sectional view showing a folded form of an airbag 10 according to a typical embodiment of the present invention, and FIG. 2 is an exploded perspective view schematically showing one structural example of an airbag apparatus applied to the present invention.

  In these drawings, the airbag module 5 is folded and accommodated in a housing 6, and passes through an airbag 10 in which a peripheral portion of a gas introduction port is sandwiched and fixed by the housing 6 and the retainer 7, and an opening 7 a of the retainer 7. And an inflator 8 having a spherical shape for supplying gas into the airbag 10. Reference numeral 9 indicates a lead wire connected to an activation device inside an inflator (not shown), and a connector 9a connected to a control unit or the like is provided at the tip of the lead wire 9.

  The housing 6 accommodates and fixes an inflator 8 at the bottom thereof, and a bracket 6a for attaching to an unillustrated reinforcement provided inside the instrument panel 1 shown in FIG. And a pressing metal fitting 6b for attaching the projecting square cylindrical peripheral wall portion.

  The air grid 3 is attached to the opening of the fascia 2 shown in FIG. When the airbag 10 is inflated and deployed, the tear grid 3a formed by a thin groove formed on the inner surface of the airbag grid 3 is cleaved, the door of the airbag grid 3 is opened, and the airbag 10 is moved outward of the instrument panel 1. Inflate and deploy instantaneously in a predetermined form.

  In addition, the structure of the airbag device for a passenger seat and its constituent members are examples of a general airbag mounting structure, and the present invention is not limited to the illustrated examples. Of course.

  FIG. 3 shows a structural example of a typical airbag 10 of the present invention. In the figure, an airbag main body 11 has side panels 12a and 12a formed on the left and right sides, an upper panel 12 having a rear wall 12b formed at the rear end facing the occupant, and a side wall 12a of the upper panel 12. And a lower panel 13 having a rear wall 13b coupled to the rear wall 12b at a rear end facing the occupant.

  The lower panel 13 has a substantially rectangular gas introduction port 13c connected to the gas generation port of the inflator 8, and a plurality of mounting holes for clamping and fixing between the housing 6 and the retainer 7 shown in FIG. Is formed. A vent hole 12 c is formed in the side wall portion 12 a of the upper panel 12. A reinforcing cloth is sewn on the inner periphery of the vent hole 12c.

  The upper and lower panels 12 and 13 are made of, for example, a woven fabric made of 315 denier nylon yarn, and the woven fabric is coated with a silicone resin. The airbag 10 can be connected and integrated into a bag shape by sewing the outer peripheral edges of the upper and lower panels 12 and 13 of the airbag body 11 together according to a conventional method.

  The structure and form of the airbag 10 are not limited to the illustrated examples. In the present invention, airbags having various shapes can be used. For example, the left and right side surfaces of the airbag body 11 can be used. Can be sewn in a three-dimensional shape. The two side cloths constituting the two and the one central cloth for sewing the left and right side cloths can be sewn.

  FIG. 4 shows a folding process of the airbag 10. In the figure, the upper and lower panels 12 and 13 are substantially trapezoidal in a state where they are spread out in a plane.

  The present invention is characterized in that, in the folded state of the airbag body 11, a flat gas guide portion 14 constituting a gas flow path toward the passenger is formed inside the airbag body 11. As shown in FIGS. 1 and 4 (a) to 4 (c), the gas guide 14 which is a characteristic part of the present invention is configured such that when the airbag body 11 is folded, the upper and lower panels 12, 13 are overlapped in a flat shape. In addition to folding, the left and right side wall portions 12a, 13a can be formed in a bellows shape so as to be parallel to each other at a predetermined distance from the gas inlet 13c.

  Before folding the left and right side walls 12a, 13a of the upper and lower panels 12, 13 as shown in FIG. 4 (c), the rear ends of the upper and lower panels 12, 13 as shown in FIGS. 4 (a), (b). It is effective to fold the bellows toward the gas inlet 13c. As shown in FIGS. 4 (a) and 4 (b), the folded form at the rear ends of the upper and lower panels 12 and 13 is the rear end of the upper and lower panels 12 and 13 in a state of being separated from the gas inlet 13c of the lower panel 13. Is folded in a bellows shape.

  As shown in FIG. 4B, the front end portion of the gas guide portion 14 may be formed so as to communicate with the gas inlet port 13 c disposed between the left and right side wall portions 12 a and 13 a of the upper and lower panels 12 and 13. In addition, the flow of the gas introduced from the gas inlet 13c can be directly guided to the passenger.

  The folding form at the rear end portions of the upper and lower panels 12 and 13 is not limited to the illustrated example. For example, the rear end portions of the upper and lower panels 12 and 13 may introduce the introduction timing or introduction of the introduced gas into the gas guide portion 14. It is only necessary to be able to control the direction, the inflation speed of the airbag 10 as a whole, and the form of inflation and deployment. For example, the airbag 10 can be folded in a bellows shape so as to be arranged on the gas inlet 13c in accordance with the deployment characteristics.

  When the airbag body 11 is folded in the initial stage, the folded waveform and the folding height of the airbag 10 as a whole can be made constant by folding the rear ends of the upper and lower panels 12 and 13 in a bellows shape. In the next step after the rear end portions of the upper and lower panels 12 and 13 are folded, the entire airbag 10 can be formed without being bulky and in a compact folded shape, and the airbag 10 can be formed in the housing 6. It can be easily and reliably attached.

  In addition, when the airbag 10 is inflated and deployed by folding the constituent base fabric of the gas guide portion 14 formed between the left and right side wall portions 12a and 13a of the upper and lower panels 12 and 13 toward the gas inlet port 13c, The gas pressure introduced from the gas inlet 13c can be well distributed to the periphery, and the bulging surfaces of the upper and lower panels 12, 13 can be widely expanded and deployed toward the occupant.

  After the rear end portions of the upper and lower panels 12 and 13 are folded in a bellows shape, a crease is formed as shown by a broken line in FIG. 4A, and the left and right sides of the upper and lower panels 12 and 13 are left as shown in FIG. The side wall portions 12a and 13a are folded on the upper panel 12 in a state of being spaced apart from the gas inlet port 13c in the left and right direction with a required dimensional interval. In the present embodiment, the left and right side wall portions 12a and 13a of the upper and lower panels 12 and 13 are folded in a bellows shape on the upper panel 12 as a folding form in the left and right side wall portions 12a and 13a. It is not limited.

  Even when the left and right side wall portions 12a and 13a of the upper and lower panels 12 and 13 are folded, the introduction timing and introduction direction of the introduced gas into the gas guide portion 14 and the inflation speed of the airbag 10 as a whole are described. It is only necessary to be able to control the inflated and unfolded form, for example, various fold forms such as zigzag fold and roll fold can be used according to the unfolding characteristics.

  After the left and right side walls 12a, 13a of the upper and lower panels 12, 13 are folded away from the gas inlet port 13c in the left and right direction with a required distance between them, as shown by a broken line in FIG. As shown in FIG. 4 (d), a crease is made and the gas inlet 13c is folded in a zigzag manner.

  The airbag body 11 is folded on the gas inlet 13c without the structural base fabrics in the gas guide portion 14 of the upper and lower panels 12 and 13 being in close contact with each other by the left and right side wall portions 12a and 13a of the upper and lower panels 12 and 13. be able to. For this reason, high-pressure gas can be inflated and deployed quickly and smoothly toward the passenger.

  In forming the flat gas guide portion 14 inside the airbag body 11, the folding process of the airbag body 11 is reduced as compared with the folding mode described in Patent Document 1, and the folding work is easily performed. Can do. For this reason, it becomes possible to automate the folding of the airbag main body 11, and work efficiency can be remarkably improved.

  When the airbag body 11 is folded, the flat gas guide portion 14 can be formed in a simple form inside the airbag body 11. For this reason, it is not necessary to provide a special shape regulating member or gas guiding means independently of the constituent base fabric of the airbag body 11. As a result, the folded airbag body 11 can be stably formed, and variations in the inflation and deployment characteristics of the airbag body 11 folded in an airtight manner are reduced.

  Thus, the airbag 10 can be partitioned into the gas guide portion 14 and its peripheral portion when the airbag is folded, and the hot gas is introduced into the gas guide portion 14 from the gas inlet 13c by the activation of the inflator 8. Can do.

  When the vehicle receives a large impact exceeding a predetermined level, the impact is detected and the inflator 8 is activated, high-pressure gas is introduced into the gas guide portion 14 from the gas inlet 13c, and the entire airbag 10 is instantly inflated. To do. In the initial stage of inflation and deployment of the airbag 10, as shown in FIGS. 5 and 6, high-pressure gas is introduced into the gas guide 14 from the gas inlet 13 c, and the high-pressure gas is the length of the gas guide 14. As a result, the inner pressure of the gas guide portion 14 rapidly increases.

  That is, a gas flow is generated at a high speed in the direction indicated by arrow A in FIGS. 5 and 6, and the section surrounded by the upper surface of the instrument panel 1 and the windshield 4 by the high-pressure gas generated from the inflator 8 is substantially triangular. The left and right width dimensions are expanded in the upper space of the instrument panel 1. The gas guide portion 14 applies tension to the upper and lower panels 12 and 13 by the force to expand in the vertical direction indicated by the broken line in FIG. 6, and the left and right side portions of the airbag body 11 are positively expanded.

  For this reason, it spreads with a wide expansion surface substantially parallel to the occupant and is in a state along the front windshield 4. During this time, the inflator 8 continues to release hot gas, and the high-pressure gas blown in the direction indicated by the arrow A in FIGS. 5 and 6 further passes through the instrument panel 1 in the vertical and horizontal directions on the passenger side. The entire airbag 10 that bulges in a predetermined form toward is immediately inflated.

  Because of such deployment characteristics, the airbag 10 can be inflated and deployed obliquely upward with respect to the occupant first, and then the entire airbag 10 can be inflated and deployed. There is no sudden impact on the passenger due to expansion. Moreover, the entire airbag 10 can be configured in a compact and low-cost manner, and heat resistance can be ensured.

  In this way, the high pressure gas generated from the inflator 8 in the airbag main body 11 is once allowed to flow out in the direction in which the length of the gas guide portion 14 is long, and the gas guide portion 14 is first inflated to thereby generate the first air. The bag expansion form can be determined by the expansion form of the gas guide portion 14. Since the hot generated gas is introduced into the left and right side portions of the airbag body 11 after passing through the gas guide portion 14, the constituent fabric of the airbag body 11 is less affected by the hot gas.

  Further, since the gas generating port of the inflator 8 can be disposed in the gas guide portion 14, the pressure loss of the inflator 8 is reduced. A small inflator having a relatively small gas output can be used, and the total weight of the airbag module 5 can be reduced. In addition, this invention is not limited to the said embodiment, Of course, the technical range which can be easily changed by those skilled in the art from the said embodiment is also included.

It is sectional drawing which shows the folding form of the airbag by typical embodiment of this invention. It is a disassembled perspective view which shows roughly one structural example of the airbag apparatus applied to this invention. It is a three-dimensional view schematically showing an example of the overall shape of the airbag when fully inflated and deployed. It is a figure which shows the folding process of the airbag. It is a figure which shows notionally the expansion | swelling form at the time of the initial stage expansion | swelling of the airbag. It is a figure which shows notionally the expansion process at the time of the expansion | deployment of the airbag. It is a perspective view which shows the conventional airbag. It is a figure which shows the folding form of the conventional airbag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument panel 2 Facia 3 Air bag grid 3a Tear line 4 Front windshield 5 Air bag module 6 Housing 6a Bracket 6b Holding metal fitting 7 Retainer 7a Opening 8 Inflator 9 Lead wire 9a Connector 10 Air bag 11 Air bag main body 12a, 13a Side wall part 12b , 13b Rear wall 12c Vent hole 13 Lower panel 13c Gas inlet 14 Gas guide

Claims (4)

An airbag for a passenger seat disposed in an instrument panel,
The airbag has an airbag main body made of a cloth bag having a gas introduction port connected to a gas generation port of an inflator,
The upper and lower portions of the airbag body are flatly stacked and folded, and the left and right sides of the airbag body are spaced apart from the gas inlet port in the left and right sides with a required dimensional interval. Folded with, forming the required dimensional interval as a gas flow path,
The gas flow path constitutes a flat gas guide part that directly introduces and guides the flow of gas introduced from the gas introduction port toward the occupant during airbag inflation and deployment.
A passenger seat airbag characterized by the above.   The airbag according to claim 1, wherein the gas introduction port is disposed at one end of the gas guide portion.   The airbag according to claim 1 or 2, wherein at least the upper part and the lower part of the airbag body are folded in a bellows shape toward the gas inlet.   The airbag according to any one of claims 1 to 3, wherein the airbag body is further folded on the gas inlet after the left and right side portions of the airbag body are folded.

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