Airbags and airbag systems

Abstract

To provide an airbag which can expand and deploy a part of the airbag to a front surface of an obstacle with a simple structure, and to provide an airbag device.SOLUTION: An airbag 2 includes: a body 2a which is expanded and deployed to the front of an occupant M; and a protruding part 2b which is expanded and deployed between a center cluster C and the occupant M. A front panel 21 includes: a first surface part 211 forming the body 2a; and a second surface part 212 forming the protruding part 2b. The second surface part 212 of the front panel 21 includes a first slit part 212a and a second slit part 212b each of which is formed by cutting a part of an outer periphery inward and has a substantially V shape.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an airbag and an airbag device, and particularly to an airbag and an airbag device suitable for a vehicle having an obstacle around an airbag to be inflated and deployed.

Background Art

[0002] In general, vehicles such as automobiles are equipped with an airbag device for absorbing the impact generated on a passenger by inflating and deploying an airbag inside the vehicle in an emergency such as at the time of a collision. Such an airbag device generally includes an airbag that is folded during normal times and inflated and deployed during an emergency, an inflater that supplies gas to the airbag, a retainer that holds the airbag and the inflater, and an airbag cover that covers the airbag.

[0003] In recent years, many vehicles have a center cluster equipped with a display of a navigation system, switches for air conditioning equipment, etc. at the center of an instrument panel. Such a center cluster (particularly, the display part) often has a shape protruding with respect to the instrument panel and is likely to interfere with the inflation and deployment of an airbag.

[0004] When an obstacle exists around an airbag to be inflated and deployed like a center cluster, the posture (e.g., orientation and position) of the airbag during inflation and deployment may collapse. Also, depending on the collision direction of the vehicle, a passenger may move toward the center cluster. Therefore, for example, as described in Patent Document 1, an airbag having an expansion part for covering the front surface of the center cluster has already been proposed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, in the airbag described in Patent Document 1, it is necessary to inflate and deploy the airbag body in a way that does not interfere with obstacles, and the inflation and deployment shape of the airbag body must be controlled by a tether or the like. Consequently, the structure of the airbag becomes more complex, and problems such as increased weight and a larger folded shape arise.

[0007] This invention was conceived in view of the aforementioned problems, and aims to provide an airbag and airbag device that can inflate and deploy a portion of the airbag in front of an obstacle with a simple structure. [Means for solving the problem]

[0008] According to the present invention, an airbag that is normally folded and stored within the vehicle structure and inflates and deploys in front of an occupant seated in a vehicle seat when gas is supplied in an emergency, the airbag comprises a main body portion that inflates and deploys in front of the occupant, and a protruding portion that inflates and deploys between an obstacle formed in the vehicle structure and the occupant, the airbag comprises a front panel located on the occupant side when inflated and deployed, and a rear panel located on the vehicle structure side when inflated and deployed, the front panel includes a first surface portion that forms the main body portion and a second surface portion that forms the protruding portion, and the rear panel includes a first surface portion that forms the main body portion and a second surface portion that forms the protruding portion, and at least the second surface portion of the front panel has a plurality of notches in which a part of the outer circumference is cut inward and opposite sides are sewn together The plurality of notches include a first notch and a second notch formed at adjacent positions, and the second surface of the front panel includes a linear intermediate portion formed between the first notch and the second notch. An airbag characterized by the following is provided.

[0010] The planned suture line of the first incision portion comprises a first vertex that forms a turning point and a first boundary point that forms a boundary point with the intermediate portion, and the planned suture line of the second incision portion comprises a second vertex that forms a turning point and a second boundary point that forms a boundary point with the intermediate portion, and the distance between the first vertex and the second vertex may be set wider than the distance between the first boundary point and the second boundary point.

[0011] The second surface portion of the rear panel may have an intermediate straight section that is sewn to the intermediate portion.

[0012] The perimeter of the second surface of the rear panel may be the same as the perimeter of the second surface of the front panel after the plurality of cuts have been sewn together.

[0013] The protrusions may be located on one or both sides of the main body.

[0014] The second surface of the rear panel may have multiple notches in which a portion of the outer circumference is cut inward and opposite sides are sewn together.

[0015] The airbag may be provided with vent holes formed at positions off-axis from the direction in which the occupant collides with the main body.

[0016] Ma Before The front portion of the airbag, which is composed of the main body and the protruding portion, is configured to form a single inflatable surface that is substantially facing the occupant. It's fine if you do that.

[0017] The planned suture line positioned on the front side of the first surface and the planned suture line positioned on the front side of the second surface may be configured to be continuous in a straight line.

[0018] Furthermore, the present invention provides an airbag device characterized by comprising an airbag having any of the above-described configurations. [Effects of the Invention]

[0019] According to the airbag and airbag device according to the present invention described above, by forming a plurality of cut portions in the panel constituting the protruding portion of the airbag having a main body portion and a protruding portion, the protruding portion can be three-dimensionally sewn, the thickness of the expansion and deployment of the protruding portion can be increased, and a part of the airbag can be expanded and deployed in front of an obstacle with a simple structure.

Brief Description of the Drawings

[0020] [Figure 1] It is an overall configuration diagram showing an airbag device according to a first embodiment of the present invention. [Figure 2] It is a schematic diagram showing the expansion and deployment shape of the airbag shown in FIG. 1, where (A) is a view taken in the direction of arrow A in FIG. 1, and (B) is a view taken in the direction of arrow B in FIG. 1. [Figure 3] It is a plan development view of the panel constituting the airbag shown in FIG. 1, where (A) shows the front panel and (B) shows the rear panel. [Figure 4] It is a view showing a modification example of the airbag shown in FIG. 1, where (A) shows a first modification example and (B) shows a second modification example. [Figure 5] It is a plan development view of the panel constituting the airbag according to a second embodiment of the present invention, where (A) shows the front panel and (B) shows the rear panel.

Modes for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5(B). Here, it is an overall configuration diagram showing an airbag device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram showing the expansion and deployment shape of the airbag shown in FIG. 1, where (A) is a view taken in the direction of arrow A in FIG. 1, and (B) is a view taken in the direction of arrow B in FIG. 1.

[0022] As shown in Figure 1, the airbag device 1 according to the first embodiment of the present invention comprises an airbag 2 that is normally folded and housed within the instrument panel I and inflates and deploys in front of an occupant M seated in a vehicle seat Z when gas is supplied in an emergency; an inflator 3 that supplies gas to the airbag 2; a retainer 4 that holds the airbag 2 and the inflator 3; and an airbag cover 5 that covers the airbag 2 and forms part of the instrument panel I.

[0023] The vehicle shown in Figure 1 has a center cluster C in the center of the instrument panel I. The center cluster C is equipped with the navigation system display, air conditioning switches, etc. The instrument panel I is an example of a vehicle structure in which airbags 2 are located.

[0024] The airbag system 1 shown in Figure 1 is, for example, a passenger-side airbag system, and the airbag 2 inflates and deploys into the space surrounded by, for example, the occupant M, the windshield W, and the instrument panel I. The center cluster C is an example of an obstacle that may interfere with the airbag 2 when it inflates and deploys.

[0025] The inflator 3 is fixed to the retainer 4 with its gas nozzle inserted into the airbag 2. The inflator 3 is connected to an ECU (electronic control unit) (not shown) and is controlled based on measurements from an acceleration sensor, etc. When the ECU detects an emergency such as a vehicle collision or sudden deceleration, it burns the chemical agent stored inside the inflator 3 to generate gas and supplies it to the airbag 2. The inflator 3 may be disc-shaped or cylindrical.

[0026] The retainer 4 is secured to the airbag cover 5 by, for example, a hook connected to its side, and is also connected to a vehicle body structure 6 such as a reinforcement via a connecting member. The airbag 2 and inflator 3 are fixed to the retainer 4 via a bucking ring. Note that the configuration of the retainer 4 is not limited to the illustrated configuration.

[0027] The airbag cover 5 includes, for example, a plate-shaped portion 51 that constitutes the interior surface of the vehicle, and an inner case 52 that is positioned on the back of the plate-shaped portion 51 and constitutes the airbag 2's discharge port. The plate-shaped portion 51 on the inner case 52 has a door portion 53 that is formed to be detachable when the airbag 2 inflates and deploys. The airbag cover 5 may be configured to fit into an opening formed in the instrument panel I, or it may be formed integrally with the instrument panel I. Note that the configuration of the airbag cover 5 is not limited to the illustrated configuration.

[0028] The airbag 2 has a main body 2a that inflates and deploys in front of the occupant M, and a protruding portion 2b that inflates and deploys between the center cluster C (an obstacle formed in the vehicle structure) and the occupant M. The airbag 2, composed of the main body 2a and the protruding portion 2b, is divided into two parts: a front panel 21 that is located on the occupant M side when inflated and deployed, and a rear panel 22 that is located on the instrument panel I side when inflated and deployed. Although not shown in the figures, the airbag 2 may have reinforcing patch panels as needed.

[0029] Furthermore, the airbag 2 may be provided with vent holes formed at positions off-axis from the direction in which the occupant M collides with the main body 2a. The vent holes consist, for example, of a first vent hole 24 formed on the upper side of the rear portion 2d of the main body 2a and a second vent hole 25 formed on the lower side of the rear portion 2d of the main body 2a.

[0030] For example, the first vent hole 24 is located on the same side as the protrusion 2b, and the second vent hole 25 is located on the opposite side from the protrusion 2b. Furthermore, the opening diameter of the second vent hole 25 may be larger than that of the first vent hole 24. Note that the number and arrangement of vent holes are not limited to the illustrated configuration.

[0031] The main body 2a, after being released into the vehicle from the airbag cover 5, inflates and deploys toward the occupant M while in contact with the windshield W, and has the function of primarily restraining the head of the occupant M as it moves forward. In the airbag 2 shown in Figure 2(A), the part that inflates and deploys toward the occupant M is referred to as the front part 2c, and the part that inflates and deploys toward the windshield W is referred to as the rear part 2d.

[0032] The protrusion 2b is a convex portion formed to communicate with the main body 2a. As shown in Figure 2(A), the protrusion 2b is formed on the side where the center cluster C, which obstructs the airbag 2, is located. Therefore, the position of the protrusion 2b is reversed in right-hand drive vehicles and left-hand drive vehicles. The protrusion 2b has a length X as shown in Figure 2(A) and a thickness H as shown in Figure 2(B).

[0033] Incidentally, as shown in Figure 2(A), when the center cluster C is located away from the center line L of the main body 2a, an airbag with a single panel on the side tends to inflate into a spherical shape, which may cause the airbag to interfere with the center cluster C. Therefore, an airbag with a single panel on the side requires a means to control the inflation and deployment shape of the airbag.

[0034] In contrast, as shown in Figure 1, by making the airbag 2 a two-piece structure consisting of a front panel 21 and a rear panel 22, the front panel 21 can be inflated upward and the rear panel 22 downward relative to the seam 23 between the front panel 21 and the rear panel 22, thereby regulating the width of the airbag 2 without using shape control members such as tethers. Therefore, as shown in Figure 2(a), the main body 2a can be inflated and deployed without interfering with the center cluster C.

[0035] Furthermore, for example, if the vehicle collides at an angle, the occupant M's head may move towards the center cluster C. Therefore, the airbag 2 according to this embodiment is equipped with a protruding portion 2b that can cover at least a part of the front surface of the center cluster C.

[0036] Furthermore, in order to improve the restraint performance of the protruding portion 2b, it is preferable to reduce the step difference formed between the main body portion 2a and the protruding portion 2b on the front portion 2c of the airbag 2. Therefore, the length X and thickness H of the protruding portion 2b are configured such that the front portion 2c of the airbag 2, which is composed of the main body portion 2a and the protruding portion 2b, forms a single inflatable surface (restraint surface) that is substantially directly facing the occupant M.

[0037] Here, the front panel 21 and rear panel 22 that constitute the airbag 2 will be explained with reference to Figures 3(A) and 3(B). Figure 3 is a plan view of the panels that constitute the airbag shown in Figure 1, where (A) is the front panel and (B) is the rear panel. In Figures 3(A) and 3(B), the dashed-dot lines indicate imaginary compartment lines, and the dashed-dot lines indicate planned suture lines.

[0038] The front panel 21 includes, for example, a first surface portion 211 that forms the main body portion 2a and a second surface portion 212 that forms the protruding portion 2b, as shown in Figure 3(A). If the boundary points on the outer periphery of the first surface portion 211 and the second surface portion 212 are denoted as Pf and Qf, then the first surface portion 211 and the second surface portion 212 are conceptually demarcated by a virtual demarcation line Lf connecting the boundary points Pf and Qf.

[0039] The first surface portion 211 of the front panel 21 has a substantially V-shaped first notch 211a and a second notch 211b on the side that constitutes the rear portion 2d of the airbag 2. The opposite sides constituting the first notch 211a are sutured together by planned suture lines S1 and S1', and the opposite sides constituting the second notch 211b are sutured together by planned suture lines S2 and S2'.

[0040] The second surface portion 212 of the front panel 21 is provided with a first cut portion 212a and a second cut portion 212b, which are roughly V-shaped in shape, with a portion of the outer circumference cut inward. The opposite sides constituting the first cut portion 212a are sutured together by planned suture lines S3 and S3', and the opposite sides constituting the second cut portion 212b are sutured together by planned suture lines S4 and S4'.

[0041] Furthermore, the first notch 212a and the second notch 212b are formed in adjacent positions, and the second surface portion 212 of the front panel 21 includes a linear intermediate portion 212c formed between the first notch 212a and the second notch 212b. The planned suture line S5 of the intermediate portion 212c is sutured to the planned suture line S5' of the rear panel 22.

[0042] The planned suture line S3′ of the first incision 212a includes a first vertex T1 that forms a turning point and a first boundary point U1 that forms a boundary point with the intermediate portion 212c, and the planned suture line S4 of the second incision 212b includes a second vertex T2 that forms a turning point and a second boundary point U2 that forms a boundary point with the intermediate portion 212c. The distance Dt between the first vertex T1 and the second vertex T2 is set to be wider than the distance Du between the first boundary point U1 and the second boundary point U2.

[0043] With this configuration, as shown in Figure 1, the expansion area of ​​the protrusion 2b on the occupant M side can be expanded relative to the suture line 23 of the airbag 2. The distance Du between the first boundary point U1 and the second boundary point U2 is also the length of the intermediate section 212c. The shape of the protrusion 2b (thickness H, length X, etc.) is determined by conditions such as the lengths of the planned suture lines S3 and S3' of the first cut portion 212a, the lengths of the planned suture lines S4 and S4' of the second cut portion 212b, the length of the interval Dt, the opening angle of the planned suture lines S3' and S4, and the length of the interval Du (intermediate section 212c).

[0044] Furthermore, the planned suture line S6 located on the front surface 2c side of the first surface 211 and the planned suture line S7 located on the front surface 2c side of the second surface 212 are configured to be continuous in a straight line without bending, for example, on a virtual section line Lf near the boundary point Qf. This configuration makes it possible to reduce the step difference between the main body 2a and the protruding part 2b when the airbag 2 is inflated and deployed.

[0045] Furthermore, a first vent hole 24 is formed between the first notch 211a of the first surface portion 211 and the second surface portion 212, on the side of the rear portion 2d. By forming the first vent hole 24 at this position, the vent hole can be positioned off-axis from the direction in which the occupant M collides with the main body portion 2a.

[0046] The rear panel 22 includes, for example, a first surface portion 221 that forms the main body portion 2a and a second surface portion 222 that forms the protruding portion 2b, as shown in Figure 3(B). If the boundary points on the outer periphery of the first surface portion 221 and the second surface portion 222 are denoted as Pr and Qr, then the first surface portion 221 and the second surface portion 222 are conceptually demarcated by a virtual dividing line Lr connecting the boundary points Pr and Qr.

[0047] The first surface portion 221 of the rear panel 22 includes a roughly rectangular first protrusion 221a and a second protrusion 221b on the side constituting the rear portion 2d of the airbag 2, and a roughly trapezoidal recess 221c formed between the first protrusion 221a and the second protrusion 221b. The ends of the first protrusion 221a and the second protrusion 221b are sutured together by planned suture lines S8 and S8'. The planned suture lines S9 and S9 of the pair of legs forming the recess 221c are sutured to the planned suture line S9' that forms the bottom of the recess 221c.

[0048] The second surface portion 222 of the rear panel 22 is a portion that extends in a roughly rectangular shape to the side of the first surface portion 221 and has an intermediate straight portion 222a that is sutured to the intermediate portion 212c of the front panel 21. The length Dr of the intermediate straight portion 222a is set to be the same as the length of the intermediate portion 212c in the front panel 21 (the distance Du between the first boundary point U1 and the second boundary point U2). The planned suture line S5′ of the intermediate straight portion 222a is sutured to the planned suture line S5 of the intermediate portion 212c.

[0049] Furthermore, the perimeter of the second surface portion 222 of the rear panel 22 (length from boundary point Pr to boundary point Qr) is set to be the same length as the perimeter of the second surface portion 212 of the front panel 21 after the first cut portion 212a and the second cut portion 212b are sutured together (length from boundary point Pf to boundary point Qf).

[0050] Furthermore, the planned suture line S6' located on the front surface 2c side of the first surface 221 and the planned suture line S7' located on the front surface 2c side of the second surface 222 are configured to be continuous in a straight line without bending, for example, on a virtual section line Lr near the boundary point Qr. This configuration makes it possible to reduce the step difference between the main body 2a and the protruding part 2b when the airbag 2 is inflated and deployed. The planned suture line S6' of the rear panel 22 is sutured to the planned suture line S6 of the front panel, and the planned suture line S7' of the rear panel 22 is sutured to the planned suture line S7 of the front panel.

[0051] Furthermore, an inflator opening 221d for inserting the gas nozzle of the inflator 3 is formed approximately in the center of the back portion 2d side of the first surface portion 221. In addition, a second vent hole 25 is formed on the side of the first surface portion 221 opposite to the second surface portion 222 (the side of the second protrusion 221b) and on the back portion 2d side. By forming the second vent hole 25 at this position, the vent hole can be positioned off-axis from the direction in which the occupant M collides with the main body portion 2a.

[0052] The upper half of the airbag 2 is formed by suturing the first notch 211a of the front panel 21 along the planned suture lines S1 and S1', suturing the second notch 211b along the planned suture lines S2 and S2', suturing the first cut portion 212a along the planned suture lines S3 and S3', and suturing the second cut portion 212b along the planned suture lines S4 and S4'.

[0053] Furthermore, the lower half of the airbag 2 is formed by suturing the recess 221c of the rear panel 22 along the planned suture lines S9 and S9', and suturing the first protrusion 221a and the second protrusion 221b along the planned suture lines S8 and S8'. Finally, the airbag 2, which is a bag-like structure, is formed by suturing the front panel 21 and the rear panel 22 along the suture line 23.

[0054] According to the airbag 2 and airbag device 1 of the above embodiment, by forming a plurality of notches (for example, a first notch 212a and a second notch 212b) in the front panel 21 that constitutes the protruding portion 2b of the airbag 2 which has a main body portion 2a and a protruding portion 2b, the protruding portion 2b can be three-dimensionally sewn, the thickness of the inflation and deployment of the protruding portion 2b can be increased, and a part of the airbag 2 can be inflated and deployed in front of an obstacle (for example, a center cluster C) with a simple structure.

[0055] When folding the airbag 2, for example, the protruding portion 2b is pushed inward into the main body portion 2a to adjust the overall shape, and then it is folded in a predetermined folding method (such as accordion folding, mountain folding, valley folding, or roll folding) to a desired size in the horizontal and vertical directions, and then stored inside the retainer 4.

[0056] Next, we will explain the modified versions of airbag 2 with reference to Figures 4(A) and 4(B). Here, Figure 4 shows modified versions of the airbag shown in Figure 1, with (A) showing the first modified version and (B) showing the second modified version.

[0057] The first modified example shown in Figure 4(A) involves changing the shape of the second surface portion 212 of the front panel 21. Specifically, a third notch 212d is added, and the multiple notches are composed of three notches: the first notch 212a, the second notch 212b, and the third notch 212d. In this way, the number of notches only needs to be two or more, and the expanded shape of the protruding portion 2b can be arbitrarily formed depending on the number of notches.

[0058] The second modified example shown in Figure 4(B) involves changing the shape of the second surface portion 222 of the rear panel 22. Specifically, a first notch 222b and a second notch 222c are formed on the second surface portion 222. In this way, multiple notches may be formed not only on the second surface portion 212 of the front panel 21, but also on the second surface portion 222 of the rear panel 22, where a part of the outer circumference is cut inward and opposite sides are stitched together.

[0059] Next, the airbag 2 according to the second embodiment of the present invention will be described with reference to Figures 5(A) and 5(B). Here, Figure 5 is a plan view of the panels constituting the airbag according to the second embodiment of the present invention, where (A) is the front panel and (B) is the rear panel. Note that the same reference numerals are used for the same components as in the first embodiment described above, and redundant explanations are omitted.

[0060] The airbag 2 according to the second embodiment has protrusions 2b formed on both sides of the main body 2a. In the airbag 2 according to the first embodiment described above, the protrusions 2b are formed on one side of the main body 2a, but if necessary, the protrusions 2b may be arranged on both the left and right sides of the main body 2a.

[0061] Specifically, as shown in Figure 5(A), the front panel 21 has a third surface 213 on the opposite side of the second surface 212. The third surface 213 has, for example, a first cutout 213a, a second cutout 213b, and an intermediate section 213c, similar to the second surface 212. Note that the diagram of the vent holes is omitted here.

[0062] Furthermore, as shown in Figure 5(B), the rear panel 22 has a third surface 223 on the opposite side of the second surface 222. The third surface 223 has, for example, an intermediate straight section 223a, similar to the second surface 222. Note that the diagram of the vent holes is omitted here.

[0063] The protruding portion 2b only needs to be positioned in a part that obstructs the airbag 2, and is not limited to the configurations shown in the first and second embodiments described above. Furthermore, depending on conditions such as the position and size of the obstruction, the protruding portions 2b may be of different sizes, or they may be positioned on the upper or lower part of the main body 2.

[0064] In the first embodiment (including modifications) and the second embodiment described above, the case in which the airbag device 1 is placed in the passenger seat is explained, but the airbag device 1 may be placed in a seat other than the passenger seat. Furthermore, the seat in which the airbag device 1 is placed may be a rear seat.

[0065] The present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0066] 1. Airbag system 2 airbags 2a Main body 2b Protrusion 2c Front part 2d back part 3 Inflators 4 retainers 5. Airbag cover 6. Vehicle body structure 21 Front Panel 22 Rear Panel 23 Suture lines 24 First Bend Hall 25 Second Bend Hall 51 Plate-shaped part 52 Inner Case 53 Door section 211 First surface (front panel) 211a First notch 211b Second notch 212 Second side (front panel) 212a First cut section 212b Second cut section 212c middle part 212d Third cut section 213 Third side (front panel) 213a First cut section 213b Second cut section 213c middle part 221 First front section (rear panel) 221a First protrusion 221b Second convex part 221c recess 221d Inflator opening 222 Second side (rear panel) 222a Intermediate straight section 222b First cut section 222c Second cut section 223 Third side (rear panel) 223a Intermediate straight section C Center Cluster I. Instrument Panel L center line Lf, Lr section virtual line M Crew Pf,Qf,Pr,Qr boundary point S1~S9, S1'~S9' planned suture lines T1 First vertex T2 Second vertex U1 first boundary point U2 Second boundary point W Windshield Dt,Du interval Dr. Length of the intermediate straight section Z seat

Claims

1. In an airbag that is normally folded and stored within the vehicle structure, and in an emergency, is supplied with gas and inflates and deploys in front of the occupants seated in the vehicle's seats, The airbag has a main body that inflates and deploys in front of the occupant, and a protruding portion that inflates and deploys between the obstacle formed in the vehicle structure and the occupant. The airbag comprises a front panel located on the occupant side when inflated and deployed, and a rear panel located on the vehicle structure side when inflated and deployed. The front panel includes a first surface portion that forms the main body and a second surface portion that forms the protruding portion, and the rear panel includes a first surface portion that forms the main body and a second surface portion that forms the protruding portion. At least the second surface of the front panel is provided with a plurality of notches in which a part of the outer circumference is cut inward and opposite sides are sewn together, The plurality of cuts include a first cut and a second cut formed at adjacent positions, and the second surface of the front panel has a linear intermediate portion formed between the first cut and the second cut. An airbag characterized by the following features.

2. The planned suture line of the first cut portion comprises a first vertex that forms a turning point and a first boundary point that forms a boundary point with the intermediate portion, and the planned suture line of the second cut portion comprises a second vertex that forms a turning point and a second boundary point that forms a boundary point with the intermediate portion, and the distance between the first vertex and the second vertex is set to be wider than the distance between the first boundary point and the second boundary point, the airbag according to claim 1.

3. The airbag according to claim 1, wherein the second surface portion of the rear panel has an intermediate straight portion that is sewn to the intermediate portion.

4. The airbag according to claim 1, wherein the perimeter of the second surface portion of the rear panel is the same length as the perimeter of the second surface portion of the front panel after the plurality of cut portions have been sewn together.

5. The airbag according to claim 1, wherein the protruding portion is arranged on one or both sides of the main body.

6. The airbag according to claim 1, wherein the second surface of the rear panel has a plurality of notches in which a part of the outer circumference is cut inward and opposite sides are sewn together.

7. The airbag according to claim 1, wherein the airbag is provided with a vent hole formed at a position off-axis from the direction in which the occupant collides with the main body.

8. The airbag according to claim 1, wherein the front portion of the airbag, which is composed of the main body portion and the protruding portion, is configured to form a single inflatable surface that is substantially directly facing the occupant.

9. The airbag according to claim 8, wherein the planned suture line located on the front side of the first surface and the planned suture line located on the front side of the second surface are configured to be continuous in a straight line.

10. An airbag device characterized by comprising an airbag as described in any one of claims 1 to 9.

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