JP2019147407A - Airbag device - Google Patents

Abstract

To provide a technique that contributes to improvement of productivity of an airbag which deploys in a curved shape.SOLUTION: A rear seat airbag device 10 includes an airbag 12 which deploys in a curved shape along a longitudinal direction. The airbag 12 includes: a first base cloth 30; and a second base cloth 32 which has a longitudinal length longer than that of the first base cloth 30 as a single unit and is sewn to the first base cloth 30 to form a closed space with the first base cloth 30. The second base cloth 32 is overlapped with the first base cloth 30 while folded in one or multiple positions as seen in the longitudinal direction so that its longitudinal length becomes equivalent to that of the first base cloth 30 and is sewn to the first base cloth 30 at both end parts as seen in a width direction (a shorter side direction) in this state.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an airbag device, and more particularly, to an airbag device including an airbag that develops into a curved shape.

  2. Description of the Related Art Conventionally, an airbag device that protects an occupant in a vehicle interior by detecting a vehicle collision and deploying the airbag is known. Various studies and improvements have been made on the shape of the airbag at the time of deployment from the viewpoint of highly protecting an occupant in the event of a vehicle collision. For example, Patent Document 1 discloses that the airbag deployment time can be further shortened. As an example, an airbag apparatus including an airbag that is annularly deployed is disclosed.

JP 2017-144841 A

  In the case of an annular airbag having a curved portion as applied to the airbag apparatus of Patent Document 1, it is usually produced by three-dimensional sewing. Schematically, an airbag is produced by stitching together a base fabric that forms an outer peripheral surface of an airbag, a base fabric that forms an inner peripheral surface, and a base fabric that forms a side surface. Therefore, the sewing work is relatively complicated, and the total sewing length tends to be long, so that the productivity is not always good.

  Such a situation is common to many airbags deployed in a curved shape as well as an airbag deployed in a ring shape as in Patent Document 1.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique that contributes to an improvement in productivity of an airbag that is deployed in a curved shape.

  The present invention for solving the above-mentioned problems is an airbag device including an airbag that is deployed in a curved shape along a first direction, wherein the airbag includes a first base fabric and a single unit. A second base fabric that has a length in one direction longer than a length in the first direction of the first base fabric, and that forms a closed space together with the first base fabric by being sewn to the first base fabric. The second base fabric is folded on the first base fabric in a state where the second base fabric is folded at one or more locations in the first direction so that the length in the first direction is equal to that of the first base fabric. In this state, both end portions in the second direction perpendicular to the first direction are sewn to the first base fabric.

  In this configuration, since the length in the first direction is equivalent to that of the first base fabric, both ends in the second direction of the second base fabric are sewn to the first base fabric, When the air bag (closed space) is filled with gas, the first base fabric having a short length in the first direction is naturally the inner peripheral surface, and the second base fabric having a long length in the same direction is the outer peripheral surface. The airbag is deployed in a curved shape. Therefore, it is possible to deploy the airbag in a curved shape while having a structure sewn in a plane. According to such a configuration, since the airbag can be deployed in a curved shape regardless of the conventional three-dimensional sewing, it contributes to the improvement of the productivity of the airbag, and thus the productivity of the airbag device. It will be a thing.

  In the above airbag apparatus, the second base fabric is formed such that the length of the second base fabric in the second direction is longer than the length of the first base fabric in the second direction, and both end portions in the second direction are connected to the first base fabric. The cloth is sewn to the second base cloth in a state of being fitted to both ends in the second direction of the cloth.

  According to this configuration, there is a margin in the second direction length of the second base fabric, and the thickness of the airbag can be more reliably ensured.

  In the above-described airbag device, it is preferable that the second base fabric is folded by Z-folding at the one or more locations in the first direction.

  According to this configuration, the bulk of the folded portion of the second base fabric is suppressed. Therefore, the sewing work of both base fabrics becomes easier, and it is advantageous from the viewpoint of mounting the airbag in a compact manner.

  In this case, the Z-fold is a normal Z-fold that is folded so that a cross-sectional shape when viewed from a specific side in the second direction is a Z-shape, and a normal Z-fold is an inverted Z-shape having a symmetrical cross-sectional shape. It includes at least one of the reverse Z-folds folded so as to be.

  For example, if the airbag is folded in Z-fold at a plurality of locations in the first direction, when viewed from the specific side, the airbag is folded in reverse Z-fold from the location folded in normal Z-fold. It is preferable that the locations to be provided are alternately provided along the first direction.

  According to this configuration, it is possible to keep the second base fabric flat while folding the second base fabric at a plurality of locations.

  In the airbag apparatus described above, an inflator that supplies an airbag deployment gas from one side to the other side along the first direction is the most inflated among the folded portions of the second base fabric. It is preferable that the second base fabric is folded on the first base fabric side toward the one side.

  According to this configuration, the gas flow supplied from the inflator first collides with the front end portion of the folding portion closest to the inflator, that is, the front end portion of the second base fabric folded to the first base fabric side. Thus, the deployment of the airbag is promoted. Therefore, it is advantageous to deploy the airbag more quickly.

  In the above-described airbag device, the airbag may include a tether that connects the first base fabric and the second base fabric therein.

  According to this configuration, the thickness (unevenness) of the airbag at the time of deployment can be controlled by the length of the tether.

  In addition, since what expand | deploys an airbag in loop shape is conventionally produced by three-dimensional sewing, the above structures are especially useful for what such an airbag expand | deploys in a loop shape. Become.

  According to the airbag apparatus which concerns on said each aspect, it will contribute to the improvement of the productivity of the airbag expand | deployed in the curved shape.

1 is a perspective view of a front seat to which an airbag device (rear seat airbag device) according to an embodiment of the present invention is applied. It is a side view which shows the airbag of the state which expand | deployed. It is a rear view which shows the airbag of the state which expand | deployed. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 2) of the airbag of the expand | deployed state. It is a schematic diagram for demonstrating the structure of an airbag, (a) is a principal part top view, (b) is sectional drawing (VV sectional view taken on the line (a)). It is a side surface schematic diagram of the vehicle to which the airbag apparatus (knee airbag apparatus) which concerns on other embodiment of this invention was applied. It is a front schematic diagram of the front seat which the air bag device (far side air bag device) concerning other embodiments of the present invention was applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Configuration of rear seat airbag device]
FIG. 1 is a perspective view of a front seat to which a rear seat airbag device that is an airbag device according to an embodiment is applied. Note that the direction indicators (“front”, “back”, “left”, “right”) in the figure are based on the vehicle, and the directions in the following explanation are based on this indicator unless otherwise specified. Based on.

  A rear seat airbag device 10 shown in FIG. 1 is disposed in a front seat 1 that is a driver seat or a passenger seat, and protects an occupant seated in a rear seat seat (not shown) at the time of a collision.

  The front seat 1 includes a seat cushion 2, a seat back 3 connected to the rear end portion of the seat cushion 2, and a headrest 4 connected to the upper end portion of the seat back 3. The seat back 3 is mounted on a floor panel (not shown) via a guide rail 5 so that the front seat 1 can be moved in the front-rear direction.

  The rear seat airbag device 10 is disposed in the seat back 3. The rear seat airbag device 10 is disposed at the center in the vertical direction of the seat back 3, the case 14 disposed at the upper back of the seat back 3 that accommodates and holds the airbag 12, the folded airbag 12, An inflator 16 (gas generator) that operates when a vehicle collides and supplies gas into the airbag 12 to inflate and deploy the airbag 12 (hereinafter simply referred to as deployment) is provided. Although not shown, a reaction force plate is provided on the front side of the case 14 and is fixed to a seatback frame (not shown) in the seatback 3 and applies a reaction force to the airbag 12 when the airbag 12 is deployed. ing.

  The inflators 16 are provided on both the left and right sides of the seat back 3, and are respectively fixed to the seat back frame. Each inflator 16 is connected to the airbag 12 accommodated and held in the case 14 via a gas supply pipe 18. A pair of gas supply ports 33 (see FIG. 5A) is formed on the left and right of the airbag 12, and the gas supplied from each inflator 16 through the gas supply pipe 18 passes through these gas supply ports 33. It is introduced into the airbag 12.

  Note that a breakage portion (not shown) that is broken by the airbag 12 when the airbag 12 is deployed is formed at a position corresponding to the case 14 on the back surface of the seatback 3. For example, a part of the back surface of the seat back 3 is formed thinner than the other part, and the rupture part is configured to be ruptured by the inflation pressure of the airbag 12.

  2 to 4 show the airbag 12 in a deployed state, FIG. 2 is a side view (side view from the left side), FIG. 3 is a rear view, and FIG. 4 is a cross-sectional view (of FIG. 2). The sectional view taken along line IV-IV shows the airbags 12 respectively.

  The airbag 12 is formed so as to be deployed in a loop shape in a side view. That is, the airbag 12 is curved and deployed in a substantially semicircular arc shape from the upper part of the seat back 3 to the rear, and the upper and lower sides of the seat back 3 are further extended from the end (tip) of the curved deployment part 20a. It has a linear development part 20b that linearly extends to the center in the direction, specifically, linearly toward the front and downward, and a cavity 22 between the curved development part 20a and the linear development part 20b. It is the shape which forms.

  A portion of the airbag 12 that is located at the upper back portion of the seat back 3 serving as a deployment base point is referred to as a base end portion 13a, and a portion that is located at the center of the rear surface of the seat back 3 serving as a deployment end point is referred to as a distal end portion 13b. In other words, the airbag 12 is formed such that the length from the base end portion 13a to the tip end portion 13b is longer than the length in the left-right direction (hereinafter referred to as the width direction as appropriate / corresponding to the second direction of the present invention). Yes. That is, the airbag 12 is deployed in a shape curved in a loop along its longitudinal direction (corresponding to the first direction of the present invention).

  The curved unfolding portion 20a is unfolded to face the chest of the occupant seated in the rear seat, thereby protecting the occupant's chest, and the straight unfolding portion 20b is unfolded to face the occupant's knee, To protect the occupant's knee. Note that the proximal end portion 13a and the distal end portion 13b of the airbag 12, that is, the end portion on the airbag 12 side of the curved deployment portion 20a and the end portion on the airbag 12 side of the linear deployment portion 20b are spaced apart in the vertical direction. And are connected to each other by a tether 24. Thereby, according to the physique of the passenger | crew who seated on the backseat seat, the linear expansion | deployment part 20b can be displaced to an up-down direction with respect to the curve expansion | deployment part 20a.

  Next, a more specific structure of the airbag 12 will be described with further reference to FIG.

  5A and 5B are schematic views for explaining the structure of the airbag 12. FIG. 5A is a plan view of the main part of the airbag 12, and FIG. Figure). 5A and 5B are schematic views of the airbag 12 in a state where the airbag 12 is flattened. In FIG. 5B, a first base fabric 30 and a second base fabric, which will be described later, are shown for convenience. 32 is shown in a separated state.

  As shown in FIGS. 2, 4, and 5, the airbag 12 is the same as the first base cloth 30 and a first base cloth 30 made of a synthetic resin base cloth that forms an inner peripheral surface when deployed. A base fabric made of a synthetic resin material, mainly including a second base fabric 32 that forms an outer peripheral surface, and a tether 36 that connects the base fabrics 30 and 32 to each other, and these are sewn together. Is formed.

  The shape of the 1st base fabric 30 is a rectangle which makes the length from the base end part 13a of the airbag 12 to the front-end | tip part 13b a long side, and makes the length over the width direction of the airbag 12 a short side. The shape of the second base fabric 32 is also rectangular, but the dimensions in the longitudinal direction and width direction of the second base fabric 32 alone are set longer than the same dimensions of the first base fabric 30.

  As shown in FIGS. 2 and 5A, the second base fabric 32 is folded at a plurality of locations in the longitudinal direction so that the length in the longitudinal direction is equal to the length of the first base fabric 30. In this state, the first base fabric 30 is overlapped, and in this state, both ends in the width direction are sewn to the first base fabric 30 along the longitudinal direction. In addition, the second base fabric 32 is sewn to the first base fabric 30 along the width direction with both end portions in the width direction aligned with both end portions in the width direction of the first base fabric 30. Has been. Thus, the peripheral part of the 1st base fabric 30 and the peripheral part of the 2nd base fabric 32 are sewn together, and the bag-like airbag 12 in which closed space was formed in the inside is formed. .

  In FIG. 5A, reference numeral S1 indicates stitch lines at both ends in the width direction of both base fabrics 30 and 32, and reference numeral S2 indicates stitch lines at both ends in the longitudinal direction of the base fabrics 30 and 32. Is shown.

  The 2nd base fabric 32 is sewn on the 1st base fabric 30 in the state folded at nine places of the longitudinal direction, respectively. At each folding location (hereinafter referred to as the first folding portion 34a to the ninth folding portion 34i in order from the base end portion 13a side), the second base fabric 32 is as shown in FIGS. 5 (a) and 5 (b). Furthermore, it is folded by so-called Z-folding. Specifically, a normal Z-fold that is folded so that a cross-sectional shape when viewed from a specific side in the width direction (left side in this example) is a Z-shape, and a normal Z-fold is an inverted Z-shape with a symmetrical cross-sectional shape and It is folded in any manner of reverse Z-folding.

  In this example, when viewed from the specific side, the first folding portion 34a closest to the base end portion 13a of the airbag 12 is a positive Z-fold, and the second base cloth 32 is on the base end portion 13a side. It is folded toward the inside, that is, the first base fabric 30 side. The second folding portion 34b adjacent to this is reverse Z-folded, and the second base fabric 32 is folded outward toward the distal end portion 13b, that is, the anti-first base fabric 30 side. The third folding portion 34c is again Z-folded, and the second base fabric 32 is folded inward (first base fabric 30 side) toward the base end portion 13a. And about the 4th-9th folding parts 34d-34i, while the even numbered folding part is made into reverse Z folding, the odd numbered folding part is made into reverse Z folding. That is, when viewed from the specific side, the second base fabric 32 is folded at nine positions in the longitudinal direction so that normal Z-folding and reverse Z-folding are alternately arranged in order from the base end portion 13a side. It is. It should be noted that the folding amount Bf of each of the folding portions 34a to 34i, that is, the folding size of the second base fabric 32 in the longitudinal direction is almost the same.

  As described above, the second base cloth 32 longer than the first base cloth 30 has a plurality of longitudinal positions (first folding portions 34a to 9th so that the length in the longitudinal direction is equal to that of the first base cloth 30. When both ends in the width direction are sewn to the first base fabric 30 in the folded state at the folding portion 34i), when the gas is supplied from the inflator 16 to the airbag 12, the airbag 12 naturally loops. It is designed to expand into a shape. That is, as a result of the base fabrics 30 and 32 being sewn together at both ends in the width direction, when the air bag 12 (closed space) is filled with gas, the length in the longitudinal direction is short. The base fabric 30 is the inner peripheral surface and the second base fabric 32 having a long length in the longitudinal direction is the outer peripheral surface, and the airbag 12 is deployed in a curved shape along the longitudinal direction.

  And in this example, these 1st-9th folding parts 34a-34i are provided in the fixed area | region including the center part of the longitudinal direction of the 2nd base fabric 32, and these folding parts 34a-34i are provided. The region provided with is curved and developed in a substantially semicircular arc shape, and the other regions are developed linearly. Thereby, the airbag 12 that is deployed in a loop shape including the curved deployment portion 20a and the linear deployment portion 20b is configured.

  As shown in FIG. 4, a thin-film tether 36 that connects the first base fabric 30 and the second base fabric 32 is provided inside the airbag 12. The tether 36 is made of a synthetic resin base fabric, and is continuously provided in the longitudinal direction of the airbag 12 at a position that divides the inner space of the airbag 12 into four equal parts in the width direction. Thereby, the space | interval of the 1st base fabric 30 and the 2nd base fabric 32 is controlled, and the thickness of the whole airbag 12 at the time of expansion | deployment is maintained by the substantially constant thickness (exactly the thickness within a fixed range). It is like that. Further, by being partitioned by the tether 36, four spaces 40 to 43 arranged in the width direction are formed in the airbag 12.

In the vicinity of the base end portion 13 a of the airbag 12, gas supply ports 33 (see FIG. 5) are respectively provided at positions corresponding to the two inner spaces 41 and 42 among the four spaces 40 to 43 formed in the airbag 12. (A) (only one is shown in the figure) is formed, and the gas from the inflator 16 is introduced into the airbag 12 through the gas supply port 33. As shown in FIG. 4, communication holes 36 a that communicate with adjacent spaces are formed at a plurality of positions in the longitudinal direction of each tether 36, and thereby two inner spaces 41 through the gas supply port 33. , 42 flows toward the distal end portion 13b of the airbag 12 while diffusing into the spaces 40, 43 at both ends through the communication holes 36a of the respective tethers 36 (in FIG. 5B). See the white arrow).
[Function and effect]
According to the airbag 12 of the rear seat airbag device 10 as described above, the second base fabric 32 and the first base fabric 30 are sewn in a state in which a plurality of portions in the longitudinal direction of the second base fabric 32 are folded. Although it is a planar structure, the airbag 12 can be deployed in a curved loop shape as a whole, including the curved deployment portion 20a and the linear deployment portion 20b, during gas filling. That is, the airbag 12 can be deployed in a loop shape (curved shape) without using the conventional three-dimensional sewing. Therefore, compared to a conventional type of airbag that is three-dimensionally sewn, the labor of sewing the airbag 12 can be reduced, and the total sewing length can be shortened. Therefore, the productivity of the airbag 12 and, consequently, the productivity of the rear seat airbag device 10 are improved.

  Moreover, since the airbag 12 has a planar structure as described above, the airbag 12 can be accommodated in the case 14 in a more compactly folded state than a conventional airbag that is three-dimensionally sewn. It becomes. Therefore, the space occupied by the airbag 12 in the rear seat airbag device 10 is reduced, and as a result, the rear seat airbag device 10 is reduced in size. In particular, since the second base fabric 32 is folded by so-called Z-folding in each of the folding portions 34a to 34i, the second base fabric 32 is not bulky while being folded at a plurality of places. Therefore, also in this respect, it is advantageous in folding the airbag 12 compactly and storing it in the case 14.

  Moreover, according to the structure of the airbag 12 as described above, the position of the curved portion can be determined by selecting the position and number of the folded portions in the longitudinal direction, or the folding amount Bf of the second base fabric 32 in each folded portion. The curvature etc. can be controlled to some extent. Therefore, the above-described effects can be enjoyed while ensuring the degree of freedom of the shape of the airbag 12.

Of the folded portions 34a to 34i of the airbag 12, the second base fabric 32 is the folded portion closest to the inflator 16, that is, the first folded portion 34a located on the most upstream side in the gas flow direction. When viewed from the specific side, the second base fabric 32 is folded inward (that is, the first base fabric 30 side) toward the base end portion 13a. According to such a structure, the flow of the gas introduced from the gas supply port 33 diffuses outward while pressing the folded leading end portion 35 of the second base fabric 32 to the downstream side, thereby promoting the deployment of the airbag 12. Let Therefore, there is an advantage that the airbag 12 can be deployed more quickly while being folded at a plurality of locations in the longitudinal direction.
[Modifications, etc.]
The above-described rear seat airbag device 10 is an exemplification of a preferred embodiment of the airbag device according to the present invention, and the specific configuration such as the structure of the airbag 12 is appropriately changed without departing from the gist of the present invention. Is possible. For example, the following configuration can be applied.

  (1) In the embodiment, when viewed from the specific side (left side), each of the folding parts 34a to 34i is arranged such that normal Z-folding and reverse Z-folding are alternately arranged in order from the base end part 13a side. Although the 2nd base fabric 32 is folded, it is not limited to this. For example, the second base fabric 32 may be folded in either the normal Z-folding or the reverse Z-folding in all the folding parts 34a to 34i. Further, the folding manner of the second base fabric 32 is not limited to Z-folding, and other folding manners may be used.

  However, according to the configuration of the airbag 12 of the embodiment in which the normal Z fold and the reverse Z fold are alternately arranged along the longitudinal direction, the folded portion is bulky while the second base fabric 32 is folded at a plurality of locations. It is possible to suppress the second base fabric 32 and keep it flatter. Therefore, it is desirable to accommodate the airbag 12 in the case 14 in a compact manner.

  (2) In the embodiment, the tether 36 that connects the first base fabric 30 and the second base fabric 32 of the airbag 12 is a sheet shape, and is continuously provided in the longitudinal direction of the airbag 12. However, it may be provided intermittently over the longitudinal direction. In that case, the tether 36 may be in the form of a plurality of strings. This configuration is advantageous when the airbag 12 is folded compactly.

  (3) In the embodiment, the example in which the present invention is applied to the rear seat airbag device 10 for protecting the passenger seated in the rear seat has been described. However, the present invention is applied to other airbag devices. It is also possible. Examples thereof will be described below.

  FIG. 6 shows an airbag device 50 that is actuated at the time of a vehicle front collision and protects mainly the knee portion of the occupant P seated on the front seat 1 and is called a so-called knee airbag device. The airbag device 50 is disposed at the lower part of the dashboard 6. The airbag 52 accommodated and held in the case 54 is configured to expand in a curved shape upward along the front surface from the lower part of the dashboard 6 by supplying gas from an inflator (not shown). Has been. In the airbag 52, the vertical direction along the dashboard 6 is the longitudinal direction, and the vehicle width direction (left-right direction) is the short direction.

  The airbag 52 has a first base fabric 56 facing the dashboard 6 and a front longitudinal seat 1 that is longer than the first base fabric 56 when deployed. It is composed of two fabrics 58. Then, the second base fabric 58 is overlaid on the first base fabric 56 in a folded state at a plurality of locations in the longitudinal direction so that the length in the longitudinal direction is equal to the length of the first base fabric 56. In the state, the 1st base fabric 56 and the 2nd base fabric 58 are mutually sewn on the peripheral part. That is, at the time of frontal collision of the vehicle, the first base fabric 56 having a short length in the vertical direction (longitudinal direction) is an inner peripheral surface, and the second base fabric 58 having a long length is an outer peripheral surface. In addition, the airbag 52 is configured to be deployed in a curved shape so as to be recessed rearward. Although not described in detail, the folding manner of each folding portion of the second base fabric 58 is the same Z-folding (at least one of normal Z-folding or reverse Z-folding) as in the above embodiment.

  FIG. 7 shows an airbag device 60 that is actuated at the time of a vehicle-side collision from the driver's seat side and protects the passenger P seated on the front seat 1 (passenger seat), and is called a so-called far-side airbag device. Is. The airbag device 60 is disposed on the side of the front seat 1 on the driver's seat side of the seat back 3, specifically, slightly below the center in the vertical direction. Then, the airbag 62 accommodated and held in the case not shown is expanded in a curved shape toward the occupant P side while being along the side surface of the seat back 3 by supplying gas from the inflator not shown. It is configured as follows. In the airbag 62, the vertical direction along the seat back 3 is the longitudinal direction, and the vehicle width longitudinal direction is the short direction.

  The airbag 62 has a first base cloth 66 positioned on the passenger P side of the passenger seat and a second base cloth positioned on the anti-passenger P side and having a single longitudinal length longer than that of the first base cloth 66. It is comprised with the base fabric 68. FIG. Then, the second base fabric 68 is overlaid on the first base fabric 66 in a folded state at a plurality of locations in the longitudinal direction so that the length in the longitudinal direction is equal to the length of the first base fabric 66. In this state, the first base fabric 66 and the second base fabric 68 are sewn together at their peripheral portions. That is, at the time of a vehicle side collision from the driver's seat side, the first base fabric 66 having a short length in the vertical direction (longitudinal direction) is an inner peripheral surface, and the second base fabric 68 having a long length is an outer peripheral surface. As shown in FIG. 7, the airbag 12 is configured to be deployed in a shape in which the upper end portion is curved toward the occupant P side. Although not described in detail, the folding manner of each folding portion of the second base fabric 68 is the same Z-folding (at least one of normal Z-folding or reverse Z-folding) as in the above embodiment.

  FIG. 7 shows an example of the airbag device 60 on the passenger seat side, but the airbag device on the driver seat side, that is, the air that is activated at the time of a vehicle side collision from the passenger seat side and protects the passenger in the driver seat. The basic configuration of the bag device is the same as that of the airbag device 60 shown in FIG. 7 except that the configuration is symmetrical.

DESCRIPTION OF SYMBOLS 1 Front seat 2 Seat cushion 3 Seat back 10 Rear seat airbag apparatus 12 Air bag 16 Inflator 20a Curve deployment | deployment part 20b Linear deployment part 30 1st base fabric 32 2nd base fabric 33 Gas supply port 34a-34i Folding part

Claims (8)

An airbag device including an airbag that is deployed in a curved shape along a first direction,
The airbag has a first base fabric and a length in a first direction as a single unit is longer than a length of the first base fabric in a first direction, and is sewn to the first base fabric. A second base fabric that forms a closed space together with the first base fabric,
The second base fabric is overlaid on the first base fabric in a state where the second base fabric is folded at one or more locations in the first direction so that the length in the first direction is equal to the length of the first base fabric. The airbag apparatus characterized by the both ends of the 2nd direction orthogonal to a 1st direction being sewn on the 1st base fabric in the state. In the airbag apparatus of Claim 1,
The length of the second base fabric in the second direction of the single base fabric is longer than the length of the first base fabric in the second direction, and both ends in the second direction are both ends in the second direction of the first base fabric. An airbag device characterized in that the airbag device is sewn to the second base fabric in a state matched to the portion. In the airbag apparatus of Claim 1,
The airbag device, wherein the second base fabric is folded by Z-folding at the one or more locations in the first direction. In the airbag apparatus of Claim 3,
The Z-fold is a normal Z-fold that is folded so that a cross-sectional shape when viewed from a specific side in the second direction is a Z-shape, and a normal Z-fold is an inverted Z-shape that has a symmetrical cross-sectional shape. An airbag device comprising at least one of inverted Z-folding to be folded. In the airbag apparatus of Claim 4,
The airbag is folded in a Z-fold at a plurality of locations in the first direction, and when viewed from the specific side, a location that is folded in a normal Z-fold and a location that is folded in a reverse Z-fold Are provided alternately along the first direction. In the airbag apparatus as described in any one of Claims 3 thru | or 5,
Comprising an inflator for supplying airbag deployment gas from one side to the other side along the first direction,
Of the folded portions of the second base fabric, the portion closest to the inflator is such that the second base fabric is folded toward the first base fabric toward the one side. apparatus. In the airbag apparatus as described in any one of Claims 1 thru | or 6,
The airbag device includes a tether that connects the first base fabric and the second base fabric therein. In the airbag apparatus as described in any one of Claims 1 thru | or 7,
The airbag device is deployed in a loop shape.