Air-bag

Abstract

To provide an air-bag that can be immediately expanded while suppressing cost increase.SOLUTION: An air-bag 1 includes: a bag-shaped air-bag main body 5 having a plurality of inflating portions at the front and back; and an inner member 21 arranged inside the air-bag main body 5 and configured to guide introduced gas to the inflating portions, respectively. The inner member 21 has: a cylindrical inner member main body 23 extending in a back and forth direction; an end gas distribution port 25 formed at least on either a front or back end of the inner member main body 23; and at least one intermediate gas distribution port 26 formed between both the ends of the inner member main body 23. In the air-bag 1, in a folded state, at least any of the intermediate gas distribution ports 26 is closed by a folded-back portion 33 obtained by folding a side of either the front or back end of the inner member main body 23 at which the end gas distribution port 25 is formed back into the inner member main body 23.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an airbag that is folded and deployed to a side of a vehicle interior by gas introduced therein. [Background technology]

[0002] Conventionally, there has been known an airbag device equipped with an airbag that expands and deploys when gas is introduced, which is a so-called curtain airbag device that deploys a longitudinal airbag in the front and rear direction along a specific surface including the pillar portion on the side of the passenger compartment of an automobile and the window portion of the door. The airbag of such an airbag device is normally folded into a long and thin shape and arranged along the roof side portion at the upper edge of the window portion. When an impact such as a side collision or rollover occurs, gas is supplied from an inflator, which is a gas generating device, and the airbag expands and deploys downward along the side window glass, etc., to restrain the occupant and protect the head, etc.

[0003] For example, in the case of a curtain airbag applied to a vehicle model with three or more rows of seats, inflatable sections corresponding to each row of seats are formed in a row front to back in the bag-shaped airbag main body, and gas distribution ports are formed at both ends and at the lower part between both ends of an inner tube, which is a cylindrical inner member arranged along the inner upper edge of the airbag main body, so that gas can be introduced into those inflatable sections (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-40264 A (Pages 5-10, Figures 1-2) Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of the above-mentioned configuration, the momentum of the gas passing through the inner tube is attenuated by passing through other gas distribution ports before reaching the gas distribution port at the end of the inner tube. Therefore, in order not to impede the rapid attenuation of the airbag, it is necessary to increase the size of the inflator or to reconsider the shape of the airbag body, which may increase costs.

[0006] The present invention has been made in consideration of the above-mentioned points, and has an object to provide an airbag that can be deployed quickly while suppressing an increase in cost. [Means for solving the problem]

[0007] The airbag described in claim 1 is an airbag that deploys to the side of the vehicle cabin when gas is introduced into it from a folded state, and comprises a bag-shaped airbag main body having a plurality of inflation sections at the front and rear, and an inner member that is disposed inside the airbag main body and guides the introduced gas to each of the inflation sections, and the inner member has a cylindrical inner member main body extending in the front-to-rear direction, an end gas distribution port formed at least at either the front or rear end of the inner member main body, and at least one middle gas distribution port formed between both end ends of the inner member main body, and in a folded state, at least one of the middle gas distribution ports is blocked by a fold-back portion formed by folding back at least one of the front and rear end sides of the inner member main body where the end gas distribution ports are formed, into the inside of the inner member main body.

[0008] The airbag according to claim 2 is the airbag according to claim 1, wherein the folded portion includes a gas receiving portion for receiving gas pressure and pushing the folded portion out from inside the inner member main body portion.

[0009] The airbag of claim 3 is the airbag of claim 2, wherein the gas receiving portion is a constriction portion formed so as to gradually reduce the opening amount of the inner member main body portion toward the end portion where the end gas distribution port is formed in the inner member main body portion.

[0010] The airbag of claim 4 is an airbag of any one of claims 1 to 3, wherein the inner member has an inner gas inlet portion connected between both front and rear ends of the inner member main body portion and through which gas is introduced, and the folded-back portion is formed so as to block at least one of the intermediate gas distribution ports located in a range not exceeding in the front-rear direction the connection portion between the inner member main body portion and the inner gas inlet portion. Effect of the Invention

[0011] According to the airbag of claim 1, it is possible to quickly deploy the airbag while suppressing an increase in cost.

[0012] According to the airbag of claim 2, in addition to the effect of the airbag of claim 1, it is possible to reliably push out the folded-back portion from inside the inner member main body portion by gas pressure.

[0013] According to the airbag of claim 3, in addition to the effect of the airbag of claim 2, the gas receiving portion can be formed inexpensively and easily.

[0014] According to the airbag of claim 4, in addition to the effects of the airbag of any one of claims 1 to 3, the flow of gas from the inner gas inlet to the inner member main body is not hindered by the folded portion, and the airbag can be quickly deployed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1A is a side view showing an airbag according to an embodiment of the present invention in a deployed state as viewed from the vehicle interior side, and FIG. 1B is a side view showing the airbag in a folded state prior to deployment. [Diagram 2] FIG. 2A is a side view showing an inner member of the airbag, and FIG. 2B is a side view showing the inner member of the airbag in a folded state before deployment. [Diagram 3] FIG. 4 is a side view showing the airbag in the initial stage of deployment, as viewed from the passenger compartment side. [Figure 4]FIG. 4 is a side view showing the airbag in an intermediate stage of deployment as viewed from the passenger compartment side. [Diagram 5] FIG. 4 is a side view showing the final stage of deployment of the airbag as viewed from the passenger compartment side. [Figure 6] FIG. 4 is a side view showing the airbag after it has been deployed, as viewed from the passenger compartment side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] In Fig. 1(a), reference numeral 1 denotes an airbag. The airbag 1 is also called a curtain airbag, a side impact airbag, an inflatable curtain, or a head protection airbag, and is formed in a bag shape and folded and stored in a long and thin shape along the roof side portion, which is the installation portion of a vehicle such as an automobile, i.e., the upper edge of the door opening of the vehicle body. When the airbag 1 receives an impact in a side collision or rolls over, the gas introduced inside the airbag 1 causes it to deploy from above to below in a substantially planar shape on the side of the vehicle interior, thereby protecting the head of the occupant as a protected object.

[0018] In the following, directions such as the front-to-rear direction, both sides which are the vehicle width direction, and up-down directions will be described based on the straight-ahead direction of the vehicle, and will refer to the front direction (direction of arrow FR), rear direction (direction of arrow RR), upward (direction of arrow U), downward (direction of arrow D), etc.

[0019] In this embodiment, the airbag 1 is a large one applied to protect occupants in each seat row of a vehicle having three or more rows of seats, for example, three rows of seats. The airbag 1 is made of one or more base fabrics, and is configured to include a bag-shaped airbag body 5 and a gas introduction section 6 for introducing gas into the inside of the airbag body 5 by joining the outer edge of the base fabric by sewing or the like. Here, the gas introduction section 6 is located at the upper part, which is the deployment base end side, of the airbag body 5. In the illustrated example, the gas introduction section 6 is located at the middle part in the front-rear direction of the upper part of the airbag body 5. The gas introduction section 6 is formed in a cylindrical shape and extends from the airbag body 5 in a curved manner toward the rear and upper side. The rear end, which is the tip part of the gas introduction section 6, is formed with an insertion opening into which an inflator, which is a gas generator, is inserted.

[0020] In this embodiment, the airbag 1 is attached to the vehicle body at multiple points on its upper edge by multiple mounting parts so that the gas introduction part 6 together with the inflator is positioned, for example, above the center pillar, and the front end part is attached to a pillar (front pillar) on the vehicle body side by a tether belt 8 serving as a tether part.

[0021] The airbag body 5 is in the form of a flat bag in the vehicle width direction, with the panel on the vehicle inside facing the panel on the vehicle outside in the vehicle width direction. The airbag body 5 is formed longitudinally in the front-rear direction. The airbag body 5 covers the window portion on the side of each seat row and deploys so as to be located on the side of the seated occupant. The airbag body 5 has a plurality of air chambers, i.e., inflatable portions, formed in the front and rear. In this embodiment, three or more inflatable portions are formed in the front and rear according to the seat rows. In the illustrated example, the airbag body 5 has a first inflatable portion 10, a second inflatable portion 11, and a third inflatable portion 12, which are inflatable portions, formed side by side from the front to the rear. That is, the first inflatable portion 10 is formed corresponding to the first row seats, the second inflatable portion 11 is formed corresponding to the second row seats, and the third inflatable portion 12 is formed corresponding to the third row seats. In addition, a non-inflatable portion 13 that does not inflate is formed along the outer edge of the airbag body 5, surrounding the first inflatable portion 10 to the third inflatable portion 12.

[0022] In the illustrated example, the first inflatable portion 10 is located at the front end of the airbag body 5 in the inflatable portion, and is a portion that restrains the head of an occupant in the first row seat, i.e., the driver's seat or the passenger seat, who is thrown out and moves toward the outside of the vehicle during a side collision (side impact). The first inflatable portion 10 is set to have a predetermined width in the front-rear direction. For example, the first inflatable portion 10 is set to have a first connecting portion 15. The first connecting portion 15 is formed in a line shape by joining a panel on the inside of the vehicle and a panel on the outside of the vehicle, and the end portion is annular. For example, the first connecting portion 15 extends downward from a position near the rear of the first inflatable portion 10 and further extends forward, and is bent in an L-shape (inverted L-shape in the figure) when viewed from the side.

[0023] The second expansion section 11 is located between the first expansion section 10 and the third expansion section 12 in the expansion section, and is a section that restrains the head of a passenger in the second row seat who is thrown out and moves toward the outside of the vehicle during a side collision (side impact). The second expansion section 11 is arranged in line with the rear of the first expansion section 10 via a part of the non-inflatable section 13. The second expansion section 11 is set to have a predetermined width in the front-rear direction. For example, a second connecting section 16 is set in the second expansion section 11. The second connecting section 16 is formed in a line shape by joining a panel on the inside of the vehicle and a panel on the outside of the vehicle, and the end portion is annular. In the illustrated example, the second connecting section 16 is set in a pair in the front and rear directions, for example. The front second connecting section 16 is formed in a C-shape that opens to the rear, and the rear second connecting section 16 is formed in a U-shape (inverted C-shape) that opens to the front.

[0024] The third inflatable portion 12 is located at the rear end of the airbag body 5 in the inflatable portion, and is a portion that restrains the head of a third-row seat occupant who is thrown out and moves toward the outside of the vehicle during a side collision (side impact). The third inflatable portion 12 is arranged at the rear of the second inflatable portion 11 via a part of the non-inflatable portion 13. For example, the third inflatable portion 12 is provided with a third connecting portion 17. The third connecting portion 17 is formed in a line by joining a panel on the inside of the vehicle and a panel on the outside of the vehicle, and has an annular end. For example, the third connecting portion 17 is curved from the upper part of the position where the front end of the third inflatable portion 12 is connected to the non-inflatable portion 13 toward the rear lower side.

[0025] For clarity of explanation, the first connecting portion 15 to the third connecting portion 17 are omitted from the drawings other than Fig. 1(a). In addition, in the drawings, the shapes of the first inflatable portion 10 to the third inflatable portion 12, the non-inflatable portion 13, and the first connecting portion 15 to the third connecting portion 17 are each shown as merely an example, and may be set arbitrarily according to the required protective performance, deployment characteristics, etc. Furthermore, when there are four or more seat rows, four or more inflatable portions may be formed at the front and rear, and it is not necessary that an inflatable portion is formed for every seat row.

[0026] A space 20 extending in the front-rear direction is formed inside the airbag main body 5, spanning the upper parts of the first inflation section 10, the second inflation section 11, and the third inflation section 12. The front end of the space 20 is connected to the rear part of the first inflation section 10, and the rear end of the space 20 is connected to the front part of the third inflation section 12. The space 20 is directly connected to the gas introduction section 6. In this embodiment, the gas introduction section 6 is shaped so as to branch off from the space 20. An inner member 21 is housed inside the airbag main body 5, spanning from the space 20 to the inside of the gas introduction section 6.

[0027] The inner member 21 is also called an inner tube, etc. The inner member 21 also functions as a reinforcing member that protects the airbag body 5 and the gas inlet portion 6 against the pressure of the gas introduced from the inflator.

[0028] The inner member 21 has an inner member main body 23. The inner member main body 23 is formed in a long cylindrical shape and is disposed longitudinally in the front-rear direction inside the airbag main body 5 along the space 20. The inner member main body 23 is formed with a plurality of gas distribution ports for distributing gas to each inflatable portion. In this embodiment, the inner member main body 23 is formed with end gas distribution ports 25 at both ends, and with a middle gas distribution port 26 at the middle of the end gas distribution ports 25.

[0029] The end gas distribution port 25 is a gas distribution port that opens in the front-rear direction, which is the axial or longitudinal direction, of the inner member main body portion 23. The end gas distribution port 25a located at the front end of the inner member main body portion 23 is located within the first inflation portion 10 when the airbag 1 is in the deployed state and distributes gas to the first inflation portion 10, while the end gas distribution port 25b located at the rear end of the inner member main body portion 23 is located within the third inflation portion 12 when the airbag 1 is in the deployed state and distributes gas to the third inflation portion 12.

[0030] The intermediate gas distribution port 26 is a gas distribution port that opens in the up-down direction, which is a direction intersecting the axial direction of the inner member main body 23. The intermediate gas distribution port 26 may be singular or plural, and may be set to an arbitrary number depending on, for example, the number of inflatable portions of the airbag main body 5. In this embodiment, one intermediate gas distribution port 26 is formed in the lower part of the longitudinal middle portion of the inner member main body 23. The intermediate gas distribution port 26 is located in the upper part of the second inflatable portion 11 and distributes gas to the second inflatable portion 11. In the illustrated example, the intermediate gas distribution port 26 is located in the upper part between the front and rear second connecting portions 16, 16.

[0031] In this embodiment, the inner member 21 is formed with an inner gas inlet 28. The inner gas inlet 28 is connected between the front and rear ends of the inner member main body 23 to introduce gas. The inner gas inlet 28 is formed in a cylindrical shape and extends from the upper part of the inner member main body 23 to the rear upper side in a curved manner. That is, in this embodiment, the inner gas inlet 28 is branched off from the inner member main body 23. The inner gas inlet 28 is inserted into the gas inlet 6, and the outer surface is in close contact with the inner surface of the gas inlet 6, and essentially constitutes the ventilation part of the gas inlet 6. The tip end, i.e., the rear end, of the inner gas inlet 28 serves as the insertion opening of the gas inlet 6.

[0032] The intermediate gas distribution port 26 is located in front of the inner gas inlet 28. Also, the front end side of the inner member main body 23 is formed to have a larger diameter, i.e., thicker, than the rear end side of the inner gas inlet 28.

[0033] As shown in FIG. 2(a), the inner member 21 is formed of, for example, a single or multiple base fabrics. In this embodiment, the inner member 21 is formed of a single piece of base fabric, and the upper edge of the portion extending from the inner member main body 23 to the inner gas inlet 28 is joined by a joining portion 30 such as sewing to form a cylindrical shape. For example, in this embodiment, a part of the joining portion 30 constitutes a constricted portion 31 formed so as to gradually reduce the opening amount of the inner member main body 23 toward the end portion where the end gas distribution port 25 is formed in the inner member main body 23, that is, toward the front end portion in the illustrated example. In other words, the end gas distribution port 25a located at the front end portion of the inner member main body 23 has a smaller opening amount than the end gas distribution port 25b located at the rear end portion of the inner member main body 23, and is set to have the smallest cross-sectional area in the inner member main body 23, for example. In this embodiment, the constricted portion 31 is set above the end gas distribution port 25a.

[0034] As shown in FIG. 1(b) and FIG. 2(b), when the airbag 1 is folded, at least one of the front and rear ends of the inner member main body 23 where the end gas distribution port 25 is formed is folded back into the inner member main body 23 to form a folded back portion 33. In this embodiment, the folded back portion 33 is formed by folding back the front end of the inner member main body 23. That is, the front end of the inner member main body 23 is folded back into the inner body, and the front side of the inner member main body 23 is formed into a double cylindrical shape by the folded back portion 33. In the folded back portion 33, the end gas distribution port 25a is located inside the inner member main body 23 and opens toward the rear. The folded back portion 33 closes one of the intermediate gas distribution ports 26. For example, the folded back portion 33 is formed so as to close at least one of the intermediate gas distribution ports 26 located within a range not exceeding the connection portion between the inner member main body 23 and the inner gas introduction portion 28 in the front-rear direction. In this embodiment, since there is only one intermediate gas distribution port 26, the folded-back portion 33 closes all of the intermediate gas distribution ports 26. In other words, the tip of the folded-back portion 33, i.e., the end where the end gas distribution port 25a is formed, is located rearward of the intermediate gas distribution port 26. In the illustrated example, the tip of the folded-back portion 33 faces the front part of the connection part between the inner member main body portion 23 and the inner gas inlet portion 28, and is located close to this connection part.

[0035] Then, as shown in FIG. 1(b), the airbag 1 is folded in a predetermined shape elongated in the front-rear direction with the inflator inserted into the insertion opening. In the illustrated example, the airbag 1 is folded in a roll shape, for example, from the lower end to the upper end. The folded airbag 1 is attached to a vehicle body panel in the vehicle cabin via a bracket made of metal or the like, with the folded shape being maintained by a shape-retaining member such as a sleeve, before interior materials such as a head lining and a pillar garnish are attached. This attachment work is performed by attaching and fixing the multiple attachment parts and tether belts 8 of the airbag 1 to the vehicle body with fasteners such as bolts (not shown), and fixing the inflator to a roof side part or the like. The inflator is connected to a control device provided in the vehicle body.

[0036] Next, a headlining is attached to the ceiling panel of the vehicle body to cover the airbag 1, and pillar garnishes are attached to each pillar, completing the installation of the airbag 1 to the vehicle body. In this installed state, the airbag 1 is isolated from the interior of the vehicle by the headlining and pillar garnish, and the inflator inserted into the gas introduction part 6 and the folded airbag main body 5 are held in a position above the pillar garnish.

[0037] In the event of a side collision or rollover of the vehicle, the inflator is activated by the control device, and gas injected from the inflator inflates the gas introduction portion 6 and is then introduced into the airbag body portion 5.

[0038] 3, the gas injected from the inflator inflates the inner gas introduction section 28 of the inner member 21 located in the gas introduction section 6 together with the gas introduction section 6, and then flows into the inner member main body 23 of the inner member 21. A part of the inflowing gas passes through the folded-back section 33 from the end gas distribution port 25a facing the connection section between the inner member main body 23 and the inner gas introduction section 28 and flows into the first inflation section 10, causing the first inflation section 10 to inflate downward, while the remaining part flows from the end gas distribution port 25b into the third inflation section 12, causing the third inflation section 12 to inflate downward. At this point, the second inflation section 11 has not yet been inflated and deployed because the folded-back section 33 blocks the intermediate gas distribution port 26. In other words, the gas passing through the inner member 21 flows into the first expansion section 10 and the third expansion section 12 without losing momentum, as the flow is concentrated at the end gas distribution port 25a and the end gas distribution port 25b.

[0039] In addition, the pressure of the gas flowing forward from the connection part between the inner member main body 23 and the inner gas introduction part 28 is received by the tip of the folded part 33 facing the connection part, which is the narrowed part 31 in this embodiment. Then, in the middle stage of deployment shown in FIG. 4, the first inflation part 10 and the third inflation part 12 are further inflated by the gas, while the folded part 33 is pushed forward by the gas pressure and moves forward inside the inner member main body 23 while being gradually unfolded. That is, the narrowed part 31 functions as a gas receiving part for pushing the folded part 33 out from inside the inner member main body 23. Then, when the intermediate gas distribution port 26 that was closed by the folded part 33 starts to open, a part of the gas flowing from the inner gas introduction part 28 into the inner member main body 23 flows downward and starts to flow from the intermediate gas distribution port 26 into the second inflation part 11, and the second inflation part 11 starts to inflate. In other words, the start of deployment of the second expansion section 11 is slightly delayed with respect to the start of deployment of the first expansion section 10 and the third expansion section 12 .

[0040] 5, the folded-back portion 33 moves forward of the intermediate gas distribution port 26, which opens completely, causing the second inflation portion 11, into which gas has flowed in from the intermediate gas distribution port 26, to deploy widely, following the first inflation portion 10 and the third inflation portion 12, which have already deployed widely. At this point, the momentum of the gas flowing into the first inflation portion 10 and the third inflation portion 12 from the end gas distribution ports 25a, 25b has weakened compared to the early stage of deployment, but the first inflation portion 10 and the third inflation portion 12 are already in a widely deployed state, so there is no delay in deployment.

[0041] Then, when all of the folds of the folded-back portion 33 are pushed out from the inner member main body portion 23, the airbag 1 is in a maximally deployed state as shown in Fig. 6. Then, the first to third inflation portions 10 to 12 of the airbag main body portion 5 inflated and deployed in a planar shape restrain and protect the occupant.

[0042] Thus, in this embodiment, when the airbag 1 is in a folded state, at least one of the intermediate gas distribution ports 26 is blocked by at least either the front or rear end side where the end gas distribution port 25 of the inner member main body portion 23 is formed (in this embodiment, the front end side is folded back inside the inner member main body portion 23), so that in the early stage of deployment, gas is distributed with force to the first inflation portion 10 and the third inflation portion 12 which are located far from the gas introduction portion 6, and thereafter, as the folded portion 33 is pushed out from the inner member main body portion 23 by the gas pressure, the intermediate gas distribution port 26 opens and gas is distributed to the second inflation portion 11 which is located close to the gas introduction portion 6, resulting in a deployment characteristic.

[0043] Therefore, with a simple configuration that suppresses cost increases by simply folding back at least one of the front and rear ends of the inner member main body 23 inward, it becomes possible to rapidly deploy the airbag 1 even in the case of a large airbag 1 in which multiple gas distribution ports are set in the inner member 21, without having to increase the size of the inflator or reconsider the shape of the airbag main body 5.

[0044] Furthermore, since the folded portion 33 is provided with the constriction portion 31 which is a gas receiving portion for pushing the folded portion 33 out from inside the inner member main body portion 23 under gas pressure, it becomes possible to reliably push the folded portion 33 out from inside the inner member main body portion 23 by gas pressure.

[0045] In addition, by utilizing the constriction portion 31 formed in the inner member main body portion 23 so as to gradually reduce the opening amount of the inner member main body portion 23 toward the end portion where the end gas distribution port 25 (end gas distribution port 25a) is formed, as the gas receiving portion, the gas receiving portion can be formed inexpensively and easily by utilizing the joint portion 30 that forms the inner member main body portion 23.

[0046] Furthermore, since the folded portion 33 is formed so as to block at least one of the intermediate gas distribution ports 26 located within a range not exceeding in the front-to-rear direction the connection portion between the inner member main body portion 23 and the inner gas inlet portion 28, the flow of gas from the inner gas inlet portion 28 to the inner member main body portion 23 is not hindered by the folded portion 33, and the airbag 1 can be rapidly deployed.

[0047] In one embodiment, when the airbag 1 is in a folded state, the inner member main body 23 may have the rear end side folded back inward to form the folded-back portion 33, or both front and rear ends may be folded back inward to form the folded-back portion 33.

[0048] Further, the gas receiving portion is not limited to the configuration using the throttle portion 31, and may be formed separately.

[0049] Furthermore, the gas introduction section 6 may be disposed in the upper portion of the airbag body 5, in the front or rear of the airbag body 5. In this case, the inner gas introduction section 28 may be formed coaxially with the inner member body 23. [Industrial Applicability]

[0050] The present invention can be applied to an airbag and an airbag device that are attached along a window on the side of an automobile and deploy to protect an occupant, for example. [Explanation of symbols]

[0051] 1 Airbag 5 Airbag body 10. First expansion section which is an expansion section 11. A second expansion section which is an expansion section 12. The third expansion section which is the expansion section 21 Inner member 23 Inner member body 25 End gas distribution port 26 Intermediate gas distribution port 28 Inner Gas Introduction Section 31 Gas receiving part, constriction part 33 Folded section

Claims

1. An airbag that deploys from a folded state to the side of the vehicle interior by gas introduced into the airbag, A bag-shaped airbag body having a plurality of inflatable portions at the front and rear; an inner member disposed inside the airbag body and directing the introduced gas to the inflatable portion; The inner member is a cylindrical inner member main body portion extending in the front-rear direction; an end gas distribution port formed at least at either the front or rear end of the inner member main body; At least one intermediate gas distribution port is formed between both ends of the inner member body portion, In a folded state, at least one of the front and rear end sides of the inner member main body where the end gas distribution ports are formed is folded back into the inner member main body, and at least one of the intermediate gas distribution ports is closed by a folded back portion formed therein. An airbag characterized by:

2. The folded portion is provided with a gas receiving portion for receiving gas pressure and pushing the folded portion out from inside the inner member main body portion.

2. The airbag according to claim 1.

3. The gas receiving portion is a constriction portion formed so as to gradually reduce the opening amount of the inner member body portion toward the end portion where the end gas distribution port is formed in the inner member body portion.

3. The airbag according to claim 2.

4. the inner member has an inner gas inlet portion connected between both front and rear ends of the inner member main body portion and through which gas is introduced; The folded portion is formed so as to close at least one of the intermediate gas distribution ports located within a range not exceeding in the front-rear direction a connection portion between the inner member main body portion and the inner gas inlet portion.

4. The airbag according to claim 1, wherein the airbag is a casing.

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