Airbag device

Abstract

Even if the gap between the vehicle seat and the roof or interior of the vehicle cabin is narrow, it is possible to prevent the airbag from interfering with the roof or interior when inflating and deploying, thereby achieving the expected protective performance. An airbag device (21) comprises an inflator (3) and an airbag (22) that integrally covers the head (12a) and side portion of an occupant (12) seated on a vehicle seat (9). The airbag (22) comprises a head protection chamber (2c b) that covers the head (12a) of the occupant (12) when inflated and deployed, and a side protection chamber (2c a) that covers the side portion of the occupant (12), and is stored in a range from one side portion of the backrest (9a) of the vehicle seat (9) through the upper portion to the other side portion, for example in a rolled-up state. An additional folding portion (22a) is provided on the peripheral portion extending from the side of the mounting end (22c) of the airbag (22) on the backrest portion (9a) to cover at least a portion of the peripheral portion of the airbag (22) on the opposite side to the seated occupant (12).

Description

Technical Field

[0001] The present invention relates to an airbag device which integrally protects the head, shoulders, upper arms, and lateral parts of the chest of an occupant, and, if necessary, can also protect the lateral parts of the abdomen and waist in addition to these parts, when a vehicle collision or rollover occurs.

[0002] Hereinafter, in this application, "up" and "above" refer to the direction of the head of an occupant sitting on a vehicle seat in a normal state, and "down" and "below" refer to the direction of the feet of an occupant in the same state. In addition, "front" and "front side" refer to the front direction of an occupant sitting on a vehicle seat in a normal state, and "back" and "rear side" refer to the back direction of an occupant in the same state. In addition, "left" and "left side" refer to the left hand direction of an occupant sitting on a vehicle seat in a normal state, and "right" and "right side" refer to the right hand direction of an occupant in the same state. Background Art

[0003] In recent years, an airbag device has been proposed, which uses a hood-type (shell-shaped) airbag that inflates and deploys from a storage portion of a vehicle seat to integrally cover the occupant's head and the occupant's shoulders, upper arms, and sides of the chest to protect the occupant in the event of a vehicle collision or rollover (for example, Patent Documents 1 and 2).

[0004] The airbag 2 of the airbag device 1 is, for example, Fig. 9 As shown, when the uninflated airbag 2 is unfolded and laid flat on a flat surface, the left-right direction is longer than the up-down direction. When two identical sheets 2a and 2b are overlapped, sewn portions 4 and 5 are formed by sewing the outer periphery and the center portion in the left-right direction, thereby forming inflatable chambers 2c of the same shape on the left and right of the sewn portion 5.

[0005] The left and right chambers 2c are divided into side protection chambers 2ca located at both left and right ends of the airbag 2 and a head protection chamber 2cb located in the center of the airbag 2 in the left-right direction by sewing the insides thereof with sewn portions 6 .

[0006] exist Fig. 9 In the airbag 2, one end side of the sewn portion 6 is not connected to the sewn portion 4 of the outer peripheral portion, so that the exhaust port 7 is formed between the side protection chamber 2ca and the head protection chamber 2cb. The exhaust port 7 allows gas to flow from the side protection chamber 2ca to the head protection chamber 2cb when the expansion of the side protection chamber 2ca is completed, thereby replenishing the gas supply to the head protection chamber 2cb.

[0007] The airbag 2 is configured such that, for example, an insertion portion 2d of an inflator 3 is formed in each of the left and right chambers 2c, and gas is supplied from different inflators 3 to the left and right chambers 2c so that the left and right chambers 2c are fluidically independently inflated.

[0008] In the airbag 2, a substantially Y-shaped gas guide portion 8 is provided on the insertion portion 2d. The gas guide portion 8 includes an inlet 8a into which the inflator 3 is inserted, a first outlet 8b which guides the gas ejected from the inflator 3 to the side protection chamber 2ca, and a second outlet 8c which guides the gas ejected from the inflator 3 to the head protection chamber 2cb. The cross-sectional areas of the first outlet 8b and the second outlet 8c are appropriately determined according to the amount of gas supplied to the side protection chamber 2ca and the head protection chamber 2cb.

[0009] like Fig.10 As shown in (a), the airbag 2 is stored in a rolled-up state, for example, over a range from one side of a frame 9b supporting a backrest 9a of a vehicle seat 9 through an upper portion to the other side. Specifically, a head protection chamber 2cb is stored in an upper portion of the backrest 9a, and a side protection chamber 2ca is stored in mutually separated opposing positions on the left and right sides of the backrest 9a. Fig.10 As shown in (b), the upper portion of the backrest portion 9a refers to the upper portion of the headrest 9c in the case of the vehicle seat 9 in which the backrest portion 9a and the headrest 9c are integrally formed.

[0010] Prior art literature

[0011] Patent Literature

[0012] Patent Document 1: Japanese Patent Application Publication No. 2019-14477

[0013] Patent Document 1: Japanese Patent Application Publication No. 2018-83554 Summary of the invention

[0014] Problem that the invention aims to solve

[0015] However, in recent years, the distance between the vehicle seat 9 in which the airbag 2 as described above is stored and the roof and interior of the vehicle cabin has become narrower. Fig.11 As shown, when the airbag 2 is stored in the backrest portion 9a in a rolled state, Fig.10 The storage state shown is Figures 12A to 12E As shown, during the expansion and deployment of the airbag 2, the airbag 2 may interfere with the roof 10 or interior decoration 11 of the vehicle compartment (refer to Fig. 12C , Fig.12D). When the airbag 2 is inflated and deployed, if the airbag 2 interferes with the roof 10 or interior 11 of the vehicle, the inflated and deployed direction of the airbag 2 will change, and the initial protective performance may not be exerted. In this case, the occupant 12 cannot be properly protected.

[0016] The problem to be solved by the present invention is that when the airbag is simply stored in the backrest of a vehicle seat in a rolled-up state, it interferes with the roof or interior decoration during expansion and deployment, causing the expansion and deployment direction to change, and may not be able to exert the initial protective performance.

[0017] The present invention is used to solve the above-mentioned problem. Its purpose is to prevent the airbag from interfering with the roof or interior when inflating and deploying, even when the gap between the vehicle seat and the roof or interior of the vehicle is narrow, so as to exert the expected protection performance.

[0018] Solutions to the problem

[0019] That is, the present invention is an airbag device including: an airbag which, when inflated and deployed, integrally covers the head and side parts of an occupant seated on a vehicle seat; and an inflator which supplies gas to the airbag.

[0020] The airbag has a head protection chamber that covers the side of the head from the top of the occupant's head in a completed inflation state, and a side protection chamber that covers the side of the occupant, and has an additional folding portion in a stowed state in which the airbag is stowed from one side of the backrest of the vehicle seat via the upper part to the other side in a rolled-up state or folded into a bellows-like state. The airbag has a peripheral portion extending from the mounting end side of the stowed airbag on the backrest.

[0021] Specifically, the head protection chamber is accommodated in the upper part of the backrest, and the side protection chambers are accommodated in mutually separated opposing positions on the left and right sides of the backrest. In addition, the upper part of the backrest refers to the upper part of the headrest in the case of a vehicle seat in which the backrest and the headrest are integrally formed.

[0022] In the present invention, an additional folding portion is provided on a portion of the outer peripheral portion extending from the airbag mounting end side in the curled state or folded state on the backrest portion. Furthermore, the present invention is characterized in that the additional folding portion is provided so as to cover at least a portion of the rear side of the portion of the airbag in the stored state that is curled into a roll or folded into a bellows shape. Here, "a portion of the rear side" refers to a portion on the opposite side of the seated occupant.

[0023] Specifically, the additional folding portion is configured to extend from the vicinity of the surface of the backrest portion along the shape of the peripheral portion on the opposite side of the airbag in the stored state to the vicinity of the upper portion, and is connected to the remaining portion of the peripheral portion via the folding portion folded downward near the upper portion to reach the vicinity of the surface of the backrest portion.

[0024] Effects of the Invention

[0025] In the present invention, firstly, since the additional folding portion expands and deploys to form a guide wall that determines the expansion and deployment direction of the airbag, the head protection chamber or the side protection chamber that expands and deploys from the back does not interfere with the roof or interior trim, and can exert the expected protection performance.

[0026] In the present invention, the additional folding portion covers the peripheral portion of the stored airbag on the opposite side of the seated occupant, because if the seated occupant side is covered, it is difficult to serve as a guide wall that determines the inflation and expansion direction of the airbag through inflation and expansion.

[0027] In addition, the additional folded portion preferably also covers the top portion of the airbag that is rolled up or folded into a bellows shape. This is because, in the case where the additional folded portion has a length that covers the top portion of the airbag in addition to the outer peripheral portion on the opposite side of the seated occupant, the effect of the additional folded portion as a guide wall that determines the direction in which the airbag expands and deploys is enhanced.

[0028] In addition, the additional folded portion preferably covers a portion of the upper portion of the seated passenger side that passes through the top portion of the airbag and continues from the top portion. This is because if the additional folded portion has a length that also covers a portion of the upper portion of the seated passenger side that passes through the top portion of the airbag and continues from the top portion, the inflation and deployment direction of the airbag can be determined more reliably.

[0029] In addition, it is preferred that the additional folded portion is provided at least in a portion corresponding to the head protection chamber, because when the airbag is inflated and deployed, the main interference portion is the roof in the vehicle interior.

[0030] In the present invention, first, the additional folding portion is expanded and deployed to form a guide wall. Furthermore, by forming the guide wall at a position where the head protection chamber or the side protection chamber guided by the guide wall does not interfere with the roof or interior, the chamber expanded and deployed from the rear does not interfere with the roof or interior. Therefore, the expected protection performance can be exerted, and the occupant can be appropriately protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1The figure shows the uninflated state of the first embodiment of the airbag constituting the airbag device of the present invention placed flat on a flat surface.

[0032] Figure 2 It means Figure 1 The head protection chamber of the first embodiment is shown in a state where it is mounted on an upper portion of a backrest portion of a vehicle seat.

[0033] Figure 3 So with Figure 2 The same state shows the diagram of the second embodiment of the present invention.

[0034] Figure 4 So with Figure 2 The same state shows a diagram of a third embodiment of the present invention.

[0035] Figure 5A yes Figure 3 The second embodiment shown is a perspective view just after it has been expanded and deployed.

[0036] Figure 5B yes Figure 3 A perspective view of the second embodiment at the initial stage of expansion and deployment is shown.

[0037] Figure 5C yes Figure 3 A perspective view of the second embodiment is shown in the middle stage of expansion and deployment.

[0038] Figure 5D yes Figure 3 A stereoscopic view of the second embodiment shown in the later stage of expansion and deployment.

[0039] Figure 5E yes Figure 3 The perspective view of the second embodiment shown is when the expansion and deployment is completed.

[0040] Figure 6 So with Figure 2 The same state shows a diagram of a fourth embodiment of the present invention.

[0041] Figure 7 The fifth embodiment of the airbag constituting the airbag device of the present invention is a view showing an uninflated state when the airbag is placed on a flat surface.

[0042] Figure 8 yes Figure 7 The fifth embodiment is shown as a front view when the expansion and deployment is completed.

[0043] Fig. 9 The figure shows an example of a deployed state in which the airbag of the airbag device that integrally covers and protects the head of the occupant and the shoulders, upper arms, and lateral parts of the chest of the occupant is deployed horizontally.

[0044] Fig.10 Is the installation viewed from the rear of the vehicle Fig. 9 FIG. 1 is a diagram of a vehicle seat with an airbag device, wherein in FIG. (a) a headrest is separately installed on a backrest portion of the vehicle seat, and in FIG. (b) the headrest and the backrest portion are formed integrally.

[0045] Fig.11 Is the description will constitute Fig. 9 FIG. 1 is a diagram showing a state in which a head protection chamber of an airbag of an airbag device is mounted on an upper portion of a backrest portion of a vehicle seat.

[0046] Fig. 12A yes Fig. 9 A three-dimensional image of the airbag device just after it has begun to inflate and deploy.

[0047] Fig. 12B yes Fig. 9 A perspective view of an airbag device at an early stage of inflation and deployment.

[0048] Fig. 12C yes Fig. 9 A perspective view of an airbag device in the middle stage of inflation and deployment.

[0049] Fig.12D yes Fig. 9 A three-dimensional view of an airbag device at a later stage of inflation and deployment.

[0050] Fig.12E yes Fig. 9 A perspective view of an airbag device at the completion of inflation and deployment. DETAILED DESCRIPTION

[0051] If the airbag is simply stored in the backrest of a vehicle seat in a state of being rolled up or folded into a bellows shape, it may interfere with the roof or interior when inflating and deploying, and the expected protective performance may not be obtained.

[0052] The present invention solves the problem by providing an additional folding portion on the peripheral portion extending from the airbag mounting end side on the backrest portion, for example in a rolled-up state, to cover at least a portion of the peripheral portion of the airbag in the stored state on the opposite side to the seated occupant.

[0053] Below, use Figures 1 to 8 Embodiments of the present invention will be described.

[0054] The airbag device 21 of the present invention comprises: an airbag 22 which is inflated and deployed when a vehicle collision or rollover occurs to cover the head 12a and the side parts such as the shoulders 12b, the upper arms 12c, and the chest 12d of the occupant 12 sitting on the vehicle seat 9; and an inflator 3 which ejects gas into the interior of the airbag 22. The airbag 22 has symmetrical chambers 2c of the same shape formed on the left and right sides thereof. The chamber 2c has a head protection chamber 2cb which covers the head 12a of the occupant 12 (specifically, from the top of the head to the side of the head) in the inflated state in which the inflated and deployed state is completed, and a side protection chamber 2ca which covers the side parts of the occupant 12. In addition, for the chamber 2c, the side protection chamber 2ca, and the head protection chamber 2cb, the "chamber" refers to a bag body including not only the internal space but also the sheet material forming the internal space.

[0055] The vehicle seat 9 has a seat cushion 9d and a backrest 9a, and a headrest 9c is integrally formed or separately installed on the upper part of the backrest 9a. The seat cushion 9d and the backrest 9a are connected by a frame 9b (see Fig.10 ) for support.

[0056] Figure 1 An example of the airbag 22 is shown. Figure 1 The airbag 22 is the same as before Fig. 9 The airbag 2 described in FIG. 1 is different in particular in the following respects.

[0057] The inflator 3 is installed at the lower part of the left and right sides of the airbag 22 .

[0058] For example, the additional folded portion 22a is provided at a part of the outer peripheral portion extending from the mounting end 22c side of the airbag 22 in the state of being rolled up, for example, on the backrest portion 9a.

[0059] An exhaust port 24 is provided in the sewn portion 5 at the center in the left-right direction so that the left and right chambers 2c communicate with each other.

[0060] Airbag 22 Figure 1 In the flat state shown, the front-to-back dimension is shortened by rolling up from the front to the back, or folding from the front to the back into a bellows shape, and the storage state is achieved when the backrest 9a is stored. Fig.10 As shown, the airbag 22 is stored in a rolled-up state, for example, from one side of the frame 9b supporting the backrest 9a of the vehicle seat 9 through the upper part to the other side. At this time, the side protection chambers 2cb are respectively stored in mutually separated opposing positions on the left and right sides of the backrest 9, and the head protection chambers 2ca are respectively stored in the upper part of the backrest 9. Figure 2As shown in FIG. 1 , the additional folded portion 22a is provided on a portion of the outer peripheral portion extending from the backrest portion 9a on the side of the mounting end 22c of the airbag 22 in the stored state. When the rolled-up airbag 22 is stored in the backrest portion 9a, for example, the additional folded portion 22a covers at least a portion of the outer peripheral portion of the airbag 22 on the side opposite to the occupant 12 seated on the vehicle seat 9. The mounting end 22c is formed by the airbag 22 being provided on the backrest portion 9a. Figure 2 The mounting member 13 shown is fixed to the frame 9b supporting the backrest portion 9a. The mounting end 22c of the additional folded portion 22a is located near the surface of the backrest portion 9a.

[0061] The additional folded portion 22a can determine which portion of the outer peripheral portion of the airbag 22 in the stored state is covered by appropriately adjusting the length thereof in the front-rear direction. Figure 2 In the embodiment, the additional folded portion 22a has a length that can cover at least a portion of the rear side of the portion of the airbag 22 that is rolled up or folded into a bellows shape in the stored state. Figure 2 As shown in FIG. 1 , the additional folded portion 22a covers at least approximately half of the outer peripheral portion of the airbag 22 in the rolled state, which is opposite to the occupant 12 sitting on the vehicle seat 9. The additional folded portion 22a extends to the vicinity of the top portion 22b along the shape of the outer peripheral portion of the rear side of the airbag 22 in the stored state. Figure 3 In the embodiment, the additional folded portion 22a covers the outer peripheral portion of the airbag 22 in the rolled state from the side opposite to the occupant 12 seated on the vehicle seat 9 to the top portion 22b. Figure 4 In the embodiment, the additional folded portion 22a also covers the outer peripheral portion of the airbag 22 in the rolled state from the side opposite to the occupant 12 seated on the vehicle seat 9, through the top portion 22b to the seated occupant 12 side. Figure 2 to Figure 4 In the figure, the passenger 12 is seated on the right side of the drawing, and the left side of the drawing becomes the opposite side of the seated passenger 12.

[0062] For example, Figure 3 The airbag device 21 of the present invention shown in FIG. 1 is configured such that when a vehicle is impacted by a collision or rollover, and gas is ejected from the inflator 3 in response to a signal from a sensor, the airbag 22 is activated according to the pressure relief valve 21. Figure 5A to Figure 5E The sequence shown expands and unfolds.

[0063] The ejected gas is guided into the additional folding portion 22a and the side protection chamber 2ca through the gas guide portion 8, whereby the additional folding portion 22a and the side protection chamber 2ca expand and unfold. At this time, the cross-sectional areas of the first outlet 8b and the second outlet 8c of the gas guide portion 8 are predetermined so that the additional folding portion 22a expands and unfolds before the side protection chamber 2ca. Alternatively, although not specifically shown in the figure, the side of the second outlet 8c in the head protection chamber 2c of the gas guide portion 8 may be extended to the vicinity of the additional folding portion 22a so that the second outlet 8c is set at a position closer to the additional folding portion 22a. In any one method, the additional folding portion 22a that expands and unfolds, for example, forms a guide wall 23 (refer to Figure 5B ).

[0064] The gas that has expanded and deployed the additional folded portion 22a is then guided to the head protection chamber 2cb to expand and deploy the head protection chamber 2cb.

[0065] When the head protection chamber 2cb is expanded and deployed, for example Figure 1 In the case of the airbag 22 shown in FIG. 1 , the head protection chamber 2cb is guided by the guide wall 23 and thus does not interfere with the roof 10 in the vehicle compartment (see FIG. 1 ). Figure 5C to Figure 5E ).

[0066] That is, in the airbag device 21 of the present invention, the additional folding portion 22a is first expanded and deployed to form the guide wall 23 that determines the expansion and deployment direction of the airbag 22. Therefore, the head protection chamber 2cb expanded and deployed after the additional folding portion 22a does not interfere with the roof 11, and can exert the expected protection performance. In addition, the side protection chamber 2ca expanded and deployed substantially at the same time as the additional folding portion 22a can also be suppressed from interfering with the interior 12.

[0067] The airbag device 21 of the present invention is not limited to Figure 2 to Figure 4 The airbag 22 is rolled up and stored in the backrest 9a of the vehicle seat 9 as shown in FIG. Figure 6 As shown, the backrest 9a may be stored in the backrest 9a in a state folded into a bellows shape.

[0068] exist Figure 6 The additional folding portion 22a shown is extended and folded back to cover the side opposite to the occupant 12 seated on the vehicle seat 9 to the top portion 22b, and faces downward to reach the vicinity of the upper surface of the backrest portion 9a.

[0069] However, when the airbag 22 is stored in the backrest 9a in the state of being folded into the bellows shape, it is also possible to cover only the side of the airbag 22 opposite to the occupant 12 seated on the vehicle seat 9, as in the state of being rolled up. In addition, it is also possible to cover the side of the airbag 22 from the side opposite to the occupant 12 seated on the vehicle seat 9 through the top portion 22b to the side of the occupant 12 seated on the vehicle seat 9.

[0070] Figure 7 A modified example of the airbag 22 is shown. Figure 7 In the airbag 22 of the embodiment, for example, in the stored state rolled up in a roll, the additional folded portion 22a is provided to cover at least a portion of the outer peripheral portion on the opposite side to the seated occupant 12, of the outer peripheral portion extending from the mounting end side 22c on the frame 9b supporting the backrest portion 9a, and to Figure 1 The airbag 22 is the same.

[0071] The airbag 22 in the stowed state has: a main deployment portion that is rolled up or folded into a bellows shape; an additional folding portion 22a that covers at least the rear side of the main deployment portion (the side opposite to the seated occupant 12) from the end of the main deployment portion to the mounting end 22c on the vehicle seat 9. In the fully inflated state, the main deployment portion includes: a head protection chamber 2cb that covers the head 12a of the occupant 12; and a side protection chamber 2ca that covers the side of the occupant 12. The airbag 22 is Figure 7 In the flat state shown, by appropriately adjusting the length of the additional folded portion 22a in the front-rear direction, the range covered by the additional folded portion 22a in the outer peripheral portion of the airbag 22 in the stored state can be determined.

[0072] exist Figure 7 In the airbag 22 of the embodiment, the first outlet 8b of the gas guide 8 faces the side protection chamber 2ca, but the second outlet 8c of the gas guide 8 faces the side protection chamber 2ca. Figure 1 The difference of the airbag 22 is that it is not located near the head protection chamber 2cb but near the additional folding portion 22a. Moreover, the cross-sectional area of ​​the second outlet 8c supplying gas to the additional folding portion 22a is larger than the cross-sectional area of ​​the first outlet 8b supplying gas to the side protection chamber 2ca.

[0073] Therefore, in Figure 7 In the airbag 22, in the initial stage of inflation and deployment, the additional folded portion 22a reliably functions as a guide wall, and then the head protection chamber 2cb is inflated and deployed, and can reliably protect the occupant 12 together with the side protection chamber 2ca. Figure 8 As shown, Figure 7During the period before the airbag 22 reaches the state of complete expansion and deployment, the head protection chamber 2cb does not interfere with the roof of the vehicle cabin, and the side protection chamber 2ca does not interfere with the interior of the vehicle cabin. Figure 7 In the airbag 2 shown in FIG. 1 , the exhaust port 24 is not provided in the sewn portion 5 at the center in the left-right direction. Figure 8 In the figure, 9d represents a seat cushion, and 14 represents a safety belt.

[0074] The present invention is not limited to the above-described examples, and it is apparent that the embodiments may be modified as appropriate within the scope of the technical concept described in each claim.

[0075] That is, the airbag device described above is a preferred example of the present invention, and other embodiments can also be implemented or completed by various methods. Unless otherwise specified in the subject matter of the present application specification, the present invention is not restricted by the shape, size, and structural configuration of the components shown in the drawings. In addition, the expressions and terms used in the present application specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

[0076] For example, in Figures 1 to 8 In the illustrated embodiment, the additional folding portion 22a is provided to be expanded and deployed before the head protection chamber 2cb is expanded and deployed, but an additional folding portion 22a may be further provided to be expanded and deployed before the side protection chamber 2ca is expanded and deployed.

[0077] in addition, Figure 1 , Figure 7 The illustrated airbag 22 is provided with the gas guide 8, but the gas guide 8 may not be provided as long as the gas of the inflator 3 is reliably guided to the side protection chamber 2ca or the head protection chamber 2cb via the additional return portion 22a.

[0078] In addition, Figures 1 to 8 In the illustrated embodiment, the airbag device 21 is installed on a seat where the seated occupant faces the front of the vehicle, but the airbag device 21 may be installed on a seat where the seated occupant faces the rear of the vehicle. Such a vehicle seat 9 may be provided in an autonomous vehicle or the like.

[0079] In addition, Figures 1 to 8 In the illustrated embodiment, the airbag device 22 is described as protecting the side portions of the head 12a, shoulders 12b, upper arms 12c, and chest 12d of the occupant 12. However, the present invention can also be applied to an airbag device protecting the side portions of the abdomen and waist of the occupant 12 in addition to the head 12a, shoulders 12b, upper arms 12c, and chest 12d of the occupant 12.

[0080] In addition, Figure 1 , Figure 7 The airbag 22 described in the above description is formed by sewing two sheets, but may also be formed using a so-called "one-piece woven (OPW (One-Piece Woven)" technique.

[0081] Explanation of symbols

[0082] 2ca…Side protection chamber 2cb…Head protection chamber

[0083] 3...Inflator 9...Vehicle seat

[0084] 9a…backrest 12…passenger

[0085] 12a...Head 21...Airbag device

[0086] 22 ... air bag 22a ... additional folding portion

[0087] 22b…top 22c…mounting end

Claims

1. An airbag device comprising: an airbag which, when inflated and deployed, integrally covers the head and side parts of an occupant seated on a vehicle seat; an inflator which supplies gas to the airbag; The airbag, The invention has a head protection chamber that covers the head of the occupant in the inflated state after the expansion and deployment is completed, and a side protection chamber that covers the side of the occupant. The airbag is provided with an additional folded portion on the backrest portion in a state where the airbag is stored in a range from one side portion of the backrest portion of the vehicle seat via the upper portion to the other side portion in a state where the airbag is stored in a state where the backrest portion is rolled up or folded into a bellows shape, The additional folding portion is configured to cover at least a portion of the rear side of the portion of the airbag in the stored state that is curled into a roll or folded into a bellows shape, and the airbag is constructed so that the additional folding portion is inflated and deployed earlier than the head protection chamber and the side protection chamber in the initial stage of inflation and deployment, and the additional folding portion that is inflated and deployed first forms a guide wall that determines the inflation and deployment direction of the airbag.

2. The airbag device according to claim 1, wherein: The additional folded portion is provided to extend from the vicinity of the surface of the backrest portion along the shape of the outer peripheral portion of the rear side of the stored airbag to the vicinity of the upper portion, fold downward near the upper portion, and reach the vicinity of the surface of the backrest portion.

3. The airbag device according to claim 1, wherein: The additional folded portion is provided so as to also cover a top portion of the airbag in the stored state.

4. The airbag device according to claim 3, wherein: The additional folded portion is provided so as to also cover a portion of an upper portion of the front side of the airbag in the stored state, which portion passes through the top portion and is continuous from the top portion.

5. The airbag device according to any one of claims 1 to 4, wherein: The additional folded portion is provided at least in a portion corresponding to the head protection chamber.

Images