Airbags and airbag systems

Abstract

To provide an air bag and an air bag device in which the durability of a base fabric can be improved.SOLUTION: An air bag 2 includes: a base fabric 21 constituting a bag body that is configured to be inflated and deployed in an emergency; and a plurality of reinforcing fabrics 22 disposed on the inner side of the base fabric 21. The reinforcing fabrics 22 include, for example, a surface-reinforcing fabric 22a disposed on the innermost side and two intermediate reinforcing fabrics (a first intermediate reinforcing fabric 22b and a second intermediate reinforcing fabric 22c) disposed between the surface-reinforcing fabric 22a and the base fabric 21. The first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c include a seam 23 formed on a portion (contact portion P1) which is brought into contact with an edge portion 31 of an inflator 3 as a metal component when the air bag 2 (bag body) is inflated and deployed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an airbag and an airbag device, and particularly to an airbag and an airbag device having a contact portion between a base fabric and a metal part.

Background Art

[0002] In general, vehicles such as automobiles are equipped with an airbag device for absorbing the impact generated on an occupant by inflating and deploying an airbag inside the vehicle in an emergency such as 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, and a retainer that houses the airbag and the inflater.

[0003] Since such an airbag needs to rapidly inflate and deploy using the inflation gas supplied from the inflater, the internal pressure may instantaneously increase, and a large load due to high pressure or high heat may be generated at the sewing portion of the airbag.

[0004] For example, Patent Document 1 discloses increasing the durability against heat and pressure near the sewing portion by using a reinforcing fabric added to the sewing portion of the base fabric, and reducing the load applied to the sewing portion (the first sewing portion and the second sewing portion) of the airbag by providing a third sewing portion for sewing the reinforcing fabrics together.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Incidentally, airbags are formed from a resin base fabric, and metal components such as inflators and retainers are placed inside and outside the airbag, creating contact points between the base fabric and the metal components.

[0007] High stress may occur at the contact points between the base fabric and metal components when the airbag inflates and deploys. Therefore, it is preferable to improve the durability of the base fabric even in areas where reinforcing fabric is placed on the airbag.

[0008] This invention was conceived in view of the aforementioned problems, and aims to provide an airbag and airbag device that can improve the durability of the base fabric. [Means for solving the problem]

[0009] According to the present invention, an airbag comprising a base fabric constituting a bag body that inflates and deploys in an emergency, and a plurality of reinforcing fabrics arranged inside the base fabric, The aforementioned multiple reinforcing fabrics are provided with seams that are sewn to the base fabric, Of the aforementioned multiple reinforcing fabrics, at least one reinforcing fabric is Separately from the aforementioned sewing section, An airbag is provided, characterized in that it has a seam formed in the portion that comes into contact with the edge of a metal part when the bag is inflated and deployed.

[0010] The reinforcing fabric includes an innermost surface reinforcing fabric and at least one intermediate reinforcing fabric placed between the surface reinforcing fabric and the base fabric, and the seams may be formed in the surface reinforcing fabric or the intermediate reinforcing fabric.

[0011] The seams may be formed so as to intersect with the direction in which the edge portion was formed.

[0012] The seam may be formed in a zigzag shape, a meandering shape, a spiral shape, or a figure-eight shape.

[0013] The seam may be formed by a plurality of character shapes, a plurality of numerical shapes, or a plurality of symbol shapes.

[0014] The seams may be formed to sew together adjacent reinforcing fabrics.

[0015] The intermediate reinforcing fabric may consist of two or more pieces, and the seams may be formed to sew adjacent intermediate reinforcing fabrics together.

[0016] The metal component may be an inflator that supplies expansion gas to the bag, or a retainer that houses the bag and the inflator.

[0017] Furthermore, the present invention provides an airbag comprising a base fabric constituting a bag that inflates and deploys in an emergency, and a plurality of reinforcing fabrics arranged inside the base fabric, wherein at least one of the plurality of reinforcing fabrics has a seam formed in the portion that comes into contact with the edge of a metal part when the bag inflates and deploys, and the seam is formed by sewing a thread into one of the reinforcing fabrics.

[0018] The reinforcing fabric includes an innermost surface reinforcing fabric and at least one intermediate reinforcing fabric placed between the surface reinforcing fabric and the base fabric, and the seam may be formed by sewing thread through one of the intermediate reinforcing fabrics.

[0019] The reinforcing fabric includes an innermost surface reinforcing fabric and at least one intermediate reinforcing fabric placed between the surface reinforcing fabric and the base fabric, wherein two or more intermediate reinforcing fabrics are arranged, and the seams may be formed in each of the intermediate reinforcing fabrics.

[0020] Further, according to the present invention, there is provided an airbag device characterized by including an airbag having any of the above-described configurations.

Effects of the Invention

[0021] According to the airbag and the airbag device according to the present invention described above, by disposing a reinforcing cloth having a seam formed at a portion that contacts the edge of the metal part when the bag body expands and deploys, the reinforcing cloth can be reinforced by the seam, the reinforcing cloth can also function as a buffer material, and the durability of the base cloth can be improved.

Brief Description of the Drawings

[0022] [Figure 1] It is an overall configuration diagram showing an airbag device according to an embodiment of the present invention. [Figure 2] It is an enlarged view of the contact portion P1 shown in FIG. 1, where (A) is a cross-sectional view and (B) is a plan view. [Figure 3]These are cross-sectional diagrams showing variations in sewing methods, with (A) being the first variation, (B) the second variation, (C) the third variation, (D) the fourth variation, (E) the fifth variation, (F) the sixth variation, (G) the seventh variation, and (H) the eighth variation. [Figure 4] These are plan views showing variations of the seam, with (A) being the first variation, (B) the second variation, (C) the third variation, (D) the fourth variation, and (E) the fifth variation. [Figure 5] These are plan views showing variations of the seam, with (A) showing the sixth variation, (B) the seventh variation, (C) the eighth variation, (D) the ninth variation, and (E) the tenth variation. [Modes for carrying out the invention]

[0023] Embodiments of the present invention will be described below with reference to Figures 1 to 5(E). Here, Figure 1 is an overall configuration diagram showing an airbag device according to one embodiment of the present invention. Figure 2 is an enlarged view of the contact portion P1 shown in Figure 1, where (A) is a cross-sectional view and (B) is a plan view.

[0024] An airbag device 1 according to one embodiment of the present invention includes, for example, an airbag 2 that is normally folded and housed within the structure of the vehicle and inflated and deployed in an emergency, an inflator 3 that supplies inflation gas to the airbag 2, and a retainer 4 that houses the airbag 2 and the inflator 3, as shown in Figure 1.

[0025] The airbag device 1 may be a driver's side airbag device installed in the steering wheel, a passenger side airbag device installed in the instrument panel, a side airbag device installed in the side of the vehicle or in the seat, a curtain airbag device installed in the upper part of the door, a knee airbag device corresponding to the occupant's knees, or a pedestrian airbag device installed under the hood.

[0026] The airbag 2 comprises a base fabric 21 that forms a bag that inflates and deploys in an emergency, and a plurality of reinforcing fabrics 22 arranged inside the base fabric 21. In Figure 1, for ease of explanation, the reinforcing fabrics 22 are shown as dotted lines. Furthermore, the inflated and deployed shape of the airbag 2 is not limited to the shape shown, but is designed appropriately depending on the type of airbag device 1.

[0027] The inflator 3, for example, has a roughly cylindrical shape and is fixed to the retainer 4 while 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 or the like. When the ECU detects a vehicle collision, it burns the chemical agent stored inside the inflator 3 to generate expansion gas and supplies it to the airbag 2. Note that the inflator 3 is not limited to the shape shown and may also be disc-shaped.

[0028] The retainer 4 has, for example, a box shape with an opening and is configured to accommodate the folded airbag 2. The shape of the retainer 4 is not limited to the illustrated shape and is designed appropriately depending on the type of airbag device 1.

[0029] When the airbag 2 inflates and deploys, for example, as shown by the dashed line in Figure 1, a contact point P1 is formed where the airbag 2 and the rear end of the inflator 3 come into contact, a contact point P2 is formed where the airbag 2 and the front end of the inflator 3 come into contact, and a contact point P3 is formed where the airbag 2 and the opening of the retainer 4 come into contact.

[0030] Generally, the base fabric 21 and reinforcing fabric 22 that make up the airbag 2 are made of resin-based woven fabric, while the inflator 3 and retainer 4 are made of metal parts. Therefore, excessive load may be applied to the contact points P1 to P3 between the edges of these metal parts and the airbag 2.

[0031] The magnitude of the load on contact points P1 to P3 during the inflation and deployment of airbag 2 is considered to be in the relationship P1 > P2 > P3, from the viewpoint of the arrangement and mounting structure of airbag 2 and inflator 3. The following description of this embodiment will use the case of contact point P1 as an example.

[0032] As shown in Figure 2(A), the reinforcing fabric 22, which is positioned inside the base fabric 21 that constitutes the bag, comprises, for example, a surface reinforcing fabric 22a positioned on the innermost side, and two intermediate reinforcing fabrics (first intermediate reinforcing fabric 22b and second intermediate reinforcing fabric 22c) positioned between the surface reinforcing fabric 22a and the base fabric 21. The surface reinforcing fabric 22a, the first intermediate reinforcing fabric 22b, and the second intermediate reinforcing fabric 22c are sewn to the base fabric 21 by, for example, a sewing section 22d.

[0033] The first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c have seams 23 formed at the portion (contact portion P1) that comes into contact with the edge 31 of the inflator 3, which is a metal component, when the airbag 2 (bag body) is inflated and deployed. The seams 23 are formed to sew adjacent intermediate reinforcing fabrics (first intermediate reinforcing fabric 22b and second intermediate reinforcing fabric 22c) together with sewing thread. In other words, the seams 23 are formed in a seam-like manner.

[0034] As shown in Figure 2(B), the seams 23 are formed in a zigzag shape, for example. The number and size of the peaks and valleys of the seams 23 are arbitrarily designed according to conditions such as the required strength of the reinforcing fabric 22 and the size of the area to be reinforced.

[0035] Furthermore, as shown in Figure 2(B), if we define the direction in which the edge 31 is formed (the direction of stretching) as the X direction, and the direction perpendicular to it (the direction along the surface of the base fabric 21) as the Z direction, then the seam 23 is formed to intersect with the X direction. That is, the seam 23 is formed to have a constant vertical width Wz in the Z direction. For the sake of explanation, as shown in Figure 2(A), we define the direction perpendicular to the surface of the base fabric 21 as the Y direction.

[0036] Furthermore, if the width of the edge 31 in the X direction is We, and the width of the seam 23 in the X direction is Wx, then the width Wx of the seam 23 is formed to be larger than, for example, the width We of the edge 31.

[0037] Since the contact area P1 between the edge 31 and the reinforcing fabric 22 may shift in position due to the internal pressure and inflation / deployment shape of the airbag 2, it is preferable that the width Wx and height Wz of the contact area P1 be formed over the range in which the edge 31 is expected to make contact.

[0038] Furthermore, by forming the seams 23 so as to intersect with the direction of extension (X direction) of the edge 31, the strength of the edge 31 can be improved. In addition, the strength can be adjusted by increasing or decreasing the number of seams 23 that intersect with the direction of extension (X direction) of the edge 31.

[0039] In this way, by placing intermediate reinforcing fabrics (first intermediate reinforcing fabric 22b and second intermediate reinforcing fabric 22c) at the portion that comes into contact with the edge 31 of the metal part when the bag expands and unfolds (for example, the contact portion P1), and forming a seam 23, the reinforcing fabric 22 can be reinforced by the seam 23.

[0040] Furthermore, by arranging intermediate reinforcing fabrics (first intermediate reinforcing fabric 22b and second intermediate reinforcing fabric 22c) having seams 23, the intermediate reinforcing fabrics (first intermediate reinforcing fabric 22b and second intermediate reinforcing fabric 22c) can also function as cushioning material.

[0041] Furthermore, by forming seams 23 in the intermediate reinforcing fabric (first intermediate reinforcing fabric 22b and second intermediate reinforcing fabric 22c) sandwiched between the base fabric 21 and the surface reinforcing fabric 22a, snagging between the seams 23 and the edges 31 of the metal parts is reduced, allowing the edges 31 to slide on the surface reinforcing fabric 22a, thereby suppressing the occurrence of stress concentration.

[0042] Therefore, according to the airbag 2 of this embodiment described above, the load on the base fabric 21 at the contact portion P1 between the airbag 2 and the metal part can be reduced, and the durability of the base fabric 21 can be improved.

[0043] Next, other sewing methods for seam 23 will be explained with reference to Figures 3(A) to 3(H). Here, Figure 3 is a cross-sectional view showing variations of the sewing method, with (A) being the first variation, (B) the second variation, (C) the third variation, (D) the fourth variation, (E) the fifth variation, (F) the sixth variation, (G) the seventh variation, and (H) the eighth variation.

[0044] In each figure, as in Figures 2(A) and 2(B), the direction in which the edge 31 extends is defined as the X direction, the direction perpendicular to the surface of the base fabric 21 is defined as the Y direction, and the direction along the surface of the base fabric 21 is defined as the Z direction.

[0045] The first modified example shown in Figure 3(A) has seams 23 formed on both the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c. The seams 23 are formed in a stitch-like manner by sewing the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c together with thread.

[0046] The second modified example shown in Figure 3(B) involves forming stitch-like seams 23 on both the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c, and shifting the positions of the seams 23 on the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c in the Z direction. Either the first intermediate reinforcing fabric 22b or the second intermediate reinforcing fabric 22c's seams 23 may be shifted vertically. Furthermore, the amount of shift of the seams 23 can be arbitrarily designed as needed.

[0047] The third modified example shown in Figure 3(C) involves forming stitch-like seams 23 on both the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c, and making the vertical width Wz of the seam 23 formed on the second intermediate reinforcing fabric 22c larger than the vertical width Wz of the seam 23 formed on the first intermediate reinforcing fabric 22b. Although not shown, the vertical width Wz of the seam 23 formed on the first intermediate reinforcing fabric 22b may also be made larger than the vertical width Wz of the seam 23 formed on the second intermediate reinforcing fabric 22c.

[0048] The fourth modified example shown in Figure 3(D) is one in which stitch-like seams 23 are formed only on the first intermediate reinforcing fabric 22b. Although not shown, stitch-like seams 23 may also be formed only on the second intermediate reinforcing fabric 22c.

[0049] The fifth modified example shown in Figure 3(E) is one in which the intermediate reinforcing fabric is made of a single reinforcing fabric (first intermediate reinforcing fabric 22b). In this case, stitch-like seams 23 are formed on the first intermediate reinforcing fabric 22b.

[0050] The sixth modified example shown in Figure 3(F) is one in which the intermediate reinforcing fabric is composed of three reinforcing fabrics: a first intermediate reinforcing fabric 22b, a second intermediate reinforcing fabric 22c, and a third intermediate reinforcing fabric 22e. In the sixth modified example, the seam 23 is formed in a seam shape so as to sew together the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c.

[0051] Although not shown in the figures, the seam 23 may be formed to sew together the second intermediate reinforcing fabric 22c and the third intermediate reinforcing fabric 22e, or it may be formed to sew together the first intermediate reinforcing fabric 22b, the second intermediate reinforcing fabric 22c, and the third intermediate reinforcing fabric 22e.

[0052] As described above, the number of intermediate reinforcing fabrics may be one or two or more. Furthermore, if there are three or more intermediate reinforcing fabrics, it is possible to arbitrarily design which adjacent intermediate reinforcing fabrics are sewn together to form a seam-like seam 23, and which intermediate reinforcing fabrics have stitch-like seams 23. In addition, if there are three or more intermediate reinforcing fabrics, seam-like seams 23 and stitch-like seams 23 may be mixed together.

[0053] Furthermore, as shown in Figures 3(G) and 3(H), the seam 23 may be formed in the surface reinforcing fabric 22a, which is one of the reinforcing fabrics 22. In this way, the reinforcing fabric 22 can also be reinforced by forming the seam 23 in the surface reinforcing fabric 22a.

[0054] The seventh modified example shown in Figure 3(G) has stitch-like seams 23 formed only on the surface reinforcing fabric 22a. Although not shown, stitch-like or seam-like seams 23 may also be formed on the first intermediate reinforcing fabric 22b and the second intermediate reinforcing fabric 22c in addition to the surface reinforcing fabric 22a.

[0055] The eighth modified example shown in Figure 3(H) involves sewing the surface reinforcing fabric 22a and the first intermediate reinforcing fabric 22b together with sewing thread to form a seam-like stitch 23. In this way, the stitch 23 may be formed on adjacent reinforcing fabrics 22 (surface reinforcing fabric 22a and first intermediate reinforcing fabric 22b).

[0056] Although not shown in the figures, the surface reinforcing fabric 22a, the first intermediate reinforcing fabric 22b, and the second intermediate reinforcing fabric 22c may be sewn together to form a seam-like stitch 23, or in addition to the stitch 23 described in the eighth modified example, a stitch-like stitch 23 may be formed on the second intermediate reinforcing fabric 22c.

[0057] Next, we will explain the modified planar shapes of the seam 23 with reference to Figures 4(A) to 5(E). Here, Figure 4 is a planar view showing modified seams, where (A) is the first modified shape, (B) is the second modified shape, (C) is the third modified shape, (D) is the fourth modified shape, and (E) is the fifth modified shape. Figure 5 is a planar view showing modified seams, where (A) is the sixth modified shape, (B) is the seventh modified shape, (C) is the eighth modified shape, (D) is the ninth modified shape, and (E) is the tenth modified shape.

[0058] In each figure, as in Figures 2(A) and 2(B), the direction in which the edge 31 extends is defined as the X direction, the direction perpendicular to the surface of the base fabric 21 is defined as the Y direction, and the direction along the surface of the base fabric 21 is defined as the Z direction.

[0059] The first modified example shown in Figure 4(A) is formed in which the width Wx of the seam 23 is smaller than the width We of the edge 31. The width Wx of the seam 23 can be arbitrarily designed according to the required strength of the intermediate reinforcing fabric, the size of the width We of the edge 31, etc.

[0060] The second modified example shown in Figure 4(B) is one in which the seam 23 is formed in a meandering shape. The peaks and valleys of the seam 23 can be arbitrarily designed considering the strength required for the intermediate reinforcing fabric, ease of sewing, etc. The meandering shape may also be a wave shape.

[0061] The third modification shown in Figure 4(C) is one in which the seam 23 is formed in a zigzag shape along the Z direction. In the embodiment shown in Figure 2(B), the seam 23 is formed in a zigzag shape along the X direction, but the direction of the zigzag shape may be the Z direction or any other direction.

[0062] The fourth modified example shown in Figure 4(D) is one in which the seam 23 is formed in a spiral shape. In this modified example, the spiral shape is formed by bending a straight line, but the spiral shape may also be formed by a curve. The number of turns of the spiral can be arbitrarily designed considering the strength required for the intermediate reinforcing fabric.

[0063] The fifth modified example shown in Figure 4(E) has the seam 23 formed in a horizontal figure-eight shape. The embodiment shown in Figure 2(B) and the modified examples shown in Figures 4(A) to 4(D) have the seam 23 formed in one direction, and can be sewn in one go in a single sewing operation. The seam 23 shown in the fifth modified example has intersecting parts, but can still be sewn in one go in a single sewing operation. Thus, the seam 23 may be formed along a line that can be drawn in a single stroke.

[0064] The sixth modified example shown in Figure 5(A) is one in which the seam 23 is formed by multiple I-shaped elements. In this way, the seam 23 may be formed dispersed along the stretching direction of the edge 31 of the metal part. The number of I-shaped elements can be arbitrarily designed considering the strength required for the intermediate reinforcing fabric. The I-shaped elements may also be formed at an angle.

[0065] The seventh modified example shown in Figure 5(B) is one in which the seam 23 is formed by multiple X-shaped shapes. The seam 23 may also be formed by letter shapes other than I-shaped shapes. Although not shown, the seam 23 may also be formed by multiple letter shapes such as M-shaped, N-shaped, O-shaped, U-shaped, V-shaped, W-shaped, and Z-shaped shapes.

[0066] The eighth modified example shown in Figure 5(C) is formed in which the seam 23 is made up of multiple overlapping O-shaped shapes. In this way, the seam 23 may be made up of multiple overlapping parts of letter shapes.

[0067] The ninth modified example shown in Figure 5(D) is formed so that the seam 23 encloses multiple O-shaped elements. In this way, the seam 23 may be formed so that the size of the letter shapes gradually decreases from the outside to the inside.

[0068] The tenth modified example shown in Figure 5(E) forms a seam 23 by distributing multiple X-shaped elements in the Z direction. Thus, the letter shapes constituting the seam 23 may be distributed in directions other than the X direction. The letter shapes may not be X-shaped, or different letter shapes may be combined.

[0069] The modified examples shown in Figures 5(A) to 5(E) describe the case where the stitches 23 are formed in the shape of multiple Roman letters. However, the stitches 23 may be formed in the shape of letters other than Roman letters, numerical shapes (including Arabic numerals, Roman numerals, Chinese numerals, etc.), or other symbolic shapes. Furthermore, the stitches 23 may be formed by combining different shapes.

[0070] 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]

[0071] 1. Airbag system 2 airbags 3 Inflators 4 retainer 21 base fabric 22 reinforcing fabric 22a surface reinforcing fabric 22b first intermediate reinforcing fabric 22c second intermediate reinforcing fabric 22d sewing part 22e third intermediate reinforcing fabric 23 seam 31 edge part

Claims

1. An airbag comprising a base fabric that constitutes a bag that inflates and deploys in an emergency, and a plurality of reinforcing fabrics arranged inside the base fabric, The aforementioned multiple reinforcing fabrics are provided with seams that are sewn to the base fabric, Of the plurality of reinforcing fabrics, at least one reinforcing fabric has a seam formed in a portion that comes into contact with the edge of the metal part when the bag is inflated and unfolded, separate from the sewn portion. An airbag characterized by the following features.

2. The airbag according to claim 1, wherein the reinforcing fabric includes an innermost surface reinforcing fabric and at least one intermediate reinforcing fabric disposed between the surface reinforcing fabric and the base fabric, and the seams are formed in the surface reinforcing fabric or the intermediate reinforcing fabric.

3. The airbag according to claim 1, wherein the seams are formed to intersect with the direction in which the edge portion is formed.

4. The airbag according to claim 1, wherein the seams are formed in a zigzag, meandering, spiral, or figure-eight shape.

5. The airbag according to claim 1, wherein the stitching is formed by a plurality of letter shapes, a plurality of number shapes, or a plurality of symbol shapes.

6. The airbag according to claim 1, wherein the seam is formed to sew together adjacent reinforcing fabrics.

7. The airbag according to claim 2, wherein two or more intermediate reinforcing fabrics are arranged, and the seams are formed to sew adjacent intermediate reinforcing fabrics together.

8. The airbag according to claim 1, wherein the metal component is an inflator that supplies expansion gas to the bag body or a retainer that houses the bag body and the inflator.

9. An airbag comprising a base fabric that constitutes a bag body that inflates and deploys in an emergency, and a plurality of reinforcing fabrics arranged inside the base fabric, Of the plurality of reinforcing fabrics, at least one reinforcing fabric has a seam formed in the portion that comes into contact with the edge of the metal part when the bag is inflated and unfolded. The aforementioned seam is formed by sewing thread through one of the reinforcing fabrics. An airbag characterized by the following features.

10. The airbag according to claim 9, wherein the reinforcing fabric comprises a surface reinforcing fabric positioned on the innermost side and at least one intermediate reinforcing fabric positioned between the surface reinforcing fabric and the base fabric, and the seams are formed by sewing thread into one of the intermediate reinforcing fabrics.

11. The airbag according to claim 9, wherein the reinforcing fabric comprises an innermost surface reinforcing fabric and at least one intermediate reinforcing fabric disposed between the surface reinforcing fabric and the base fabric, wherein two or more intermediate reinforcing fabrics are arranged and the seams are formed in each of the intermediate reinforcing fabrics.

12. An airbag device characterized by comprising an airbag as described in any one of claims 1 to 11.

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