Airbag device

Abstract

Provided is an innovative airbag device capable of protecting the head of an occupant from one side to the front and to the other side. The invention is an airbag device housed in a vehicle seat, which has an inflator that generates an inflation gas and an airbag that deploys from the vicinity of the upper end of the vehicle seat to protect the head of an occupant. Furthermore, the airbag includes a first chamber for protecting one side of an occupant, a second chamber connected to the first chamber and for protecting the front of the head of an occupant, a third chamber connected to the second chamber and that deploys from the front of the head of an occupant to the other side, and a fourth chamber connected to the third chamber and that deploys at the other side of an occupant.

Description

Technical Field

[0001] This invention relates to an airbag device installed in a vehicle seat. More particularly, it relates to an airbag device capable of adequately protecting the head of an occupant. Background Technology

[0002] As is well known, vehicles are equipped with one or more airbags to protect occupants in the event of an accident. Airbags come in many forms, such as the so-called driver's airbag, which deploys near the center of the steering wheel to protect the driver; curtain airbags, which deploy downwards from the inside of the windows to protect occupants in lateral collisions, rollovers, or rollover accidents; and side airbags, which deploy on the occupant's side (i.e., the side of the seat) to protect occupants in lateral collisions. This invention relates to a novel airbag device installed in a vehicle seat.

[0003] Side airbag devices restrain lateral movement of occupants by deploying airbags from the seat forward, such as the invention disclosed in Patent Document 1, which can protect not only the body but also the head.

[0004] However, in the airbag device described in Patent Document 1, although the deployed airbag can restrain one side of the occupant's head, i.e., the left or right side, it is actually impossible to protect the entire area including the front of the head.

[0005] Existing technical documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-137307 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The present invention was made in view of the above circumstances, and its object is to provide an innovative airbag device capable of protecting the occupant's head from one side to the front and then to the other side.

[0009] Problem Solving Methods

[0010] To address the aforementioned problems, the present invention provides an airbag device housed in a vehicle seat, comprising an inflator for generating expanding gas, and an airbag that deploys near the upper end of the vehicle seat to protect the area around the occupant's head. Furthermore, the airbag includes: a first chamber for protecting one side of the occupant; a second chamber connected to the first chamber for protecting the front of the occupant's head; a third chamber connected to the second chamber and deploying from the front of the occupant's head to the other side; and a fourth chamber connected to the third chamber and deploying on the other side of the occupant.

[0011] According to the present invention, since the airbag surrounds the occupant's head from one side, the front, and the other side, the occupant's head can be reliably restrained regardless of the seat position, tilt angle, etc. Furthermore, when the airbag deploys, the present invention eliminates the need for a steering wheel, dashboard, or other reaction surfaces, allowing for stable airbag deployment action and shape regardless of seat position or other limitations.

[0012] The first chamber and the second chamber can be formed into one piece by bonding two base fabrics together.

[0013] A curved section can be formed near the boundary between the first chamber and the second chamber, curving towards the occupant's head. This allows the second chamber to reliably deploy in front of the occupant's head.

[0014] At least one tether is attached to the second chamber, and the bend can be formed by the tension of the tether when the airbag is deployed.

[0015] The first chamber and the second chamber can be shaped as separate independent chambers.

[0016] Both the first and second chambers can be formed by bonding two base fabrics together. Furthermore, the vicinity of the front end of the occupant-facing inner panel of the base fabric forming the first chamber can be connected to the vicinity of the occupant-facing inner panel of the base fabric forming the second chamber on the opposite side of the third chamber.

[0017] By connecting the inner panel of the base fabric, when the airbag deploys, the expansion of the connecting part outward, that is, away from the occupant's head, is restricted, and it is easy to form a curved shape that surrounds the occupant's head.

[0018] The third chamber can be formed by bonding at least two base fabrics together. Furthermore, the end of the occupant-facing inner panel of the base fabric forming the second chamber can be connected to the end of the occupant-facing inner panel of the base fabric forming the third chamber.

[0019] A first vent hole may be formed in the connection between the second chamber and the third chamber.

[0020] The fourth chamber can be formed by folding a base fabric or by bonding two base fabrics together.

[0021] A second vent may be formed in the connection between the third chamber and the fourth chamber.

[0022] The first chamber may include an upwardly extending portion that first expands upwards and a forwardly extending portion connected to the upwardly extending portion.

[0023] A side protection chamber can also be provided, which is connected to the lower end of the upper part of the first chamber to protect the side of the occupant's body.

[0024] The inflator can be disposed inside the side protection chamber. It can also be configured such that expanding gas flows from the side protection chamber to the first chamber, the second chamber, the third chamber, and the fourth chamber.

[0025] The second chamber extends downward from the first chamber, and the end of the second chamber connected to the third chamber may be configured to bend upward when the airbag is deployed.

[0026] A side airbag for protecting the occupant's side can be installed independently of the airbag on the side of the vehicle seat opposite to the side where the airbag is housed. For example, by arranging a side airbag on the so-called proximal side and installing the airbag primarily protecting the head on the distal side, sufficient protection for the occupant can be achieved. Attached Figure Description

[0027] Figure 1 This is a perspective view mainly showing the external shape of a vehicle seat to which the airbag device involved in this invention can be applied, with the airbag device itself omitted.

[0028] Figure 2 It shows the role Figure 1 The diagram shown is a three-dimensional representation of the internal structure of the vehicle seat frame, omitting an illustration of the airbag system.

[0029] Figure 3 This is a schematic side view of a vehicle seat equipped with the airbag device 20 according to an embodiment of the present invention, and is a view from the outside in the vehicle width direction showing the airbag device 20 in its retracted state.

[0030] Figure 4 This is a top view schematically showing the deployed state of the airbag in the airbag device according to an embodiment of the present invention.

[0031] Figure 5 This is a top perspective view, i.e., a top view, showing the deployed state of the airbag in the airbag device according to an embodiment of the present invention.

[0032] Figure 6 This is a front perspective view showing the deployed state of the airbag in the airbag device according to an embodiment of the present invention.

[0033] Figure 7This is a plan view showing the shape of the panel of the airbag used in the airbag device according to an embodiment of the present invention, for forming a first chamber and a second chamber.

[0034] Figure 8 This is a plan view showing the shape of the panel of the airbag used in the airbag device that constitutes an embodiment of the present invention, for forming the side chamber.

[0035] Figure 9 This is a plan view showing the shape of the panel of the airbag used in the airbag device according to an embodiment of the present invention, for forming a third chamber.

[0036] Figure 10 This is a plan view showing the shape of the panel of the airbag used in the airbag device constituting an embodiment of the present invention, for forming a fourth chamber.

[0037] Figure 11 It is used for explanation Figures 7 to 10 The diagram shows the connection of the panels.

[0038] Figure 12 It is shown Figures 7 to 10 A plan view showing the connection status of the panels.

[0039] Figure 13 This is a top view showing the deployed state of the airbag in an airbag device according to another embodiment of the present invention. Detailed Implementation

[0040] The airbag device according to the present invention will now be described based on the accompanying drawings. In the following description, when an occupant is seated in a proper posture, the direction the occupant is facing is referred to as "front," the opposite direction as "rear," and the coordinate axis as "front-back direction." Furthermore, when an occupant is seated in a proper posture, the occupant's right side is referred to as "right direction," the occupant's left side as "left direction," and the coordinate axis as "left-right direction." Additionally, when an occupant is seated in a proper posture, the direction of the occupant's head is referred to as "above," the direction of the occupant's waist as "below," and the coordinate axis as "up-down direction." Furthermore, in the deployed airbag, the side facing the occupant's head is referred to as the inner side, and the opposite side as the outer side.

[0041] Figure 1 This is a perspective view mainly showing the external shape of a vehicle seat used in the occupant protection device involved in the present invention, omitting the illustration of the airbag device 20. Figure 2 It shows the role Figure 1The diagram shown is a three-dimensional view of the internal structure of the vehicle seat frame, and the diagram of the airbag device 20 is omitted here. Figure 3 This is a schematic side view of the occupant protection device involved in the present invention, which is a view from the outside of the vehicle width direction of the state in which the airbag device 20 is housed on the side of the vehicle seat furthest from the door, i.e., the far side.

[0042] When the vehicle seat of the present invention is viewed as a part, such as... Figure 1 and Figure 2 As shown, it includes: a seat cushion 2 for occupants to sit on, a seat back 1 forming a backrest, and a headrest 3 connected to the upper end of the seat back 1.

[0043] like Figure 1 As shown, the airbag device 20 involved in this embodiment is mainly housed in the side support portion, i.e., the distal side, of the vehicle seat. Reference numeral 21 indicates the housing containing a part of the airbag constituting the airbag device 20, namely the head protection portion 31, located at the upper part of the seat back 1 and fixed to the side of the headrest 3. When the airbag device 20 is activated and the airbag 30 deploys, the front or obliquely front portion of the housing 21 splits open.

[0044] Furthermore, the upper part of the airbag 30, namely the head protection part 31, can be stored not only in the separately constructed housing 21, but also inside the upper part of the seat back 1. In particular, in the case of a vehicle seat in which the headrest 3 and the seat back 1 are integrally formed, the storage space for the airbag 30 can be flexibly configured.

[0045] like Figure 2 As shown, the seat backrest 1 has a seat backrest frame 1f forming the seat frame inside, and a pad made of polyurethane foam or the like is provided on its surface and around its perimeter. The surface of this pad is covered with leather, fabric, or other leather. The seat cushion 2 has a seating frame 2f on its bottom side, and a pad made of polyurethane foam or the like is provided on its upper surface and around its perimeter. The surface of this pad is covered with leather, fabric, or other leather. The seating frame 2f and the seat backrest frame 1f are connected by a tilting mechanism 4.

[0046] like Figure 2 As shown, the seat back frame 1f is framed by a seat frame 10 that is arranged separately on the left and right sides and extends in the vertical direction, an upper frame connecting the upper end of the seat frame 10, and a lower frame connecting the lower end. The headrest 3 is formed by providing a cushioning member on the outside of the headrest frame.

[0047] Figure 3 This is a schematic side view of the occupant protection device involved in the present invention, showing the state in which the airbag device 20 is housed on the side of the vehicle seat furthest from the door, i.e., the far side, as viewed from the outside in the vehicle width direction.

[0048] like Figure 3 As shown, the airbag device 20 is housed near the upper right end of the seat back 1 of the vehicle seat. In this embodiment, the airbag device 20 is positioned on the so-called distal side, but it could also be positioned on the proximal side.

[0049] Figure 4 This is a top view schematically showing the deployed state of the airbag 30 in the airbag device 20 according to an embodiment of the present invention. Figure 5 This is a top-view perspective, i.e., a top view, showing the deployed state of the airbag 30. Figure 6 This is a frontal perspective view showing the deployed state of the airbag 30. Additionally, in Figure 4 and Figure 5 In the middle, the dashed line represents the suture line.

[0050] Mainly such as Figure 4 As shown, the airbag device 20 involved in this embodiment includes an inflator 160 that generates expanding gas. See [link to documentation]. Figure 6 and Figure 8 The airbag 30, which deploys from near the upper right side of the vehicle seat to protect the head of occupant P, includes: a first chamber 32 for protecting one side of occupant P; a second chamber 34 connected to the first chamber 32 for protecting the front of occupant P's head; a third chamber 36 connected to the second chamber 34 and deploying from the front of occupant P's head to the other side; and a fourth chamber 38 connected to the third chamber 36 and deploying on the other side of occupant P.

[0051] The first chamber 32 and the second chamber 34 are integrally formed into one chamber. Near the boundary between the first chamber 32 and the second chamber 34, a curved portion 33 is formed that bends in the direction close to the head of the occupant P, thereby allowing the second chamber 34 to be reliably deployed in front of the head of the occupant P.

[0052] A strap 200 connects the first chamber 32 and the second chamber 34. When the airbag 30 deploys, the second chamber 34 bends due to the tension of the strap 200. One end of the strap 200 is attached to the inner surface of the second chamber 34. The other end of the strap 200 may also be attached to a surface of the first chamber 32 at least behind the inner surface of the second chamber 34, or to other components such as the seat frame.

[0053] like Figures 4 to 6As shown, the side chamber 40 is connected below the first chamber 32. The side chamber 40 is constrained at least from near the right shoulder of the occupant P to the chest, but may also be configured to constrain all the way to the waist of the occupant P. Depending on the direction and timing of the force applied to the occupant to be protected, the side chamber 40 and the first chamber 32 may deploy simultaneously, or either the side chamber 40 or the first chamber 32 may deploy first. Figure 6 and Figure 8 As shown, the expanding gas is released from the inflator 160 housed in the side chamber 40 and flows to the first chamber 32 and / or the side chamber 40, and then flows sequentially to the second chamber 34, the second chamber 34, and the fourth chamber 38.

[0054] like Figure 4 and Figure 5 As shown, the airbag 30 deploys from the vicinity of the right side of the occupant's head to the vicinity of the left side of the occupant's head, consisting of four chambers 32, 34, 36, and 38. The second chamber 34 bends inward from the first chamber toward the occupant's side, while simultaneously deploying with a slight upward bend, reliably protecting the front of the occupant's head, including the area diagonally in front of the face. Furthermore, since at least the first chamber 32 and the fourth chamber 38 of the airbag 30 are located above the occupant's shoulder, the possibility of the deployment action being worsened due to interference from the occupant's shoulder can be suppressed. In addition, by placing the airbag 30 on the occupant's shoulder, the distance between the airbag 30 and the occupant's head can be reduced, thereby quickly restraining the occupant's head.

[0055] like Figure 4 and Figure 5 As shown in the top view of the airbag 30 when it has inflated, the long side of the second chamber 34 extends forward of the curved region 200a relative to the long side of the first chamber 32, which is longer in the longitudinal direction, towards the occupant P. Furthermore, the inflation direction of the third chamber 36 is from near the end of the second chamber 34, i.e., from the inlet of the third chamber 36, towards the inlet of the fourth chamber 38. This inflation direction of the third chamber 36 is approximately opposite to the inflation direction of the first chamber 32 in the longitudinal direction, and is angled relative to the long side of the inflated second chamber 34 in the direction from the end of the second chamber 34 towards the occupant P. Furthermore, the expansion direction of the fourth chamber 38, starting from near the end of the third chamber 36 (i.e., the inlet of the fourth chamber 38), is approximately opposite in the longitudinal direction to the expansion direction of the first chamber 32 along its long side. Moreover, the expansion direction of the fourth chamber 38 is angled relative to the expansion direction of the third chamber 36 in the direction from the end of the third chamber 36 toward the occupant P. With this structure, the airbag 30 expands and deploys by wrapping around the head of the occupant P from one shoulder.

[0056] Figure 7This is a plan view showing the panel, or base fabric, that forms the first chamber 32 and the second chamber 34. (See diagram below.) Figure 7 As shown, the first chamber 32 and the second chamber 34 are integrally formed by bonding two base fabrics 130a (inner panel) and 130b (outer panel). In the figure, symbol 132 indicates the area corresponding to the first chamber 32, and symbol 134 indicates the area corresponding to the second chamber. When the first chamber 32 and the second chamber 34 are unfolded, the inner panel 130a faces the occupant P side.

[0057] The first chamber 32, or region 132, includes an opening 154 connecting to the side chamber 40 and a tab 152 connected to a tab 164 of the side chamber 40. Expanding gas flows from the side chamber 40 into the first chamber 32 through this opening 154. An exhaust port 150a is formed in the inner panel near the end of the second chamber 34, in fluid communication with the third chamber 36, and is connected to the inner panel 136a of the third chamber 36 (see...). Figure 9 The vent 150b in the ) are connected together by stitching around them. And, the vent 37 is formed by the vents 150a and 150b.

[0058] The first chamber 32 is generally composed of an upward-directing portion 132a that guides the gas flowing in from the opening 154 upwards, and a forward-directing portion 132b connected to the upward-directing portion 132a and extending forwards. Additionally, in Figure 7 In the middle, the dashed lines other than the upper part 132a and the front part 132b represent the suture lines.

[0059] In the first chamber 32, the expanding gas first flows into the upward part 132a, so that the first chamber 32 can be quickly and reliably pulled above the shoulder of the occupant P.

[0060] Figure 8 This is a plan view showing the panel, or base fabric, that forms the side chamber 40. (See diagram below.) Figure 8 As shown, the side chamber 40 is formed by bonding two base fabrics 140a, namely the inner panel and 140b, the outer panel. In the figure, symbol 166 is the opening connected to the opening 154a of the first chamber 32, and symbol 162 is the inflator holding part for housing the inflator 160. Furthermore, symbol 164 is the tab connected to the tab 152 of the first chamber 32. This tab 164 is provided at the upper edge of the side chamber 40. The tab 152 of the first chamber 32 is provided at the lower edge of the first chamber. By connecting these tabs, unintentional shaking during inflation and deployment can be reduced, increasing the stability of inflation and deployment. Furthermore, since these tabs are connected, the inflation and deployment directions of the individual airbags will not diverge during inflation and deployment, providing more integrated and comprehensive protection for the occupant.

[0061] The side chamber 40 and the first chamber 32 are directly connected at their respective openings 154a and 166, and the connecting tabs 152 and 166 are connected to each other, thereby allowing control of the deployment posture. Additionally, in Figure 8 In the diagram, the dashed line outside the inflator 160 represents the suture line.

[0062] Figure 9 This is a plan view showing the panel, or base fabric, that forms the third chamber 36. Figure 9 In the middle, the dashed line represents the suture line.

[0063] like Figure 9 As shown, the third chamber 36 is formed by bonding two base fabrics 136a, i.e., the inner panel, and 136b, i.e., the outer panel. An exhaust port 150b, connected to the exhaust port 150a of the second chamber 34, is formed near one end of the inner panel 136a. An exhaust port 170a, connected to the exhaust port 170b of the fourth chamber 38, is also formed near the other end of the inner panel 136a. Furthermore, an exhaust hole 39 ( Figure 7 and Figure 9 It is formed by exhaust ports 170a and 170b. In addition, the length of the exhaust port 150b in the short side direction is longer than that of the exhaust port 170a, and the opening area is also larger than that of the exhaust port 170a.

[0064] Figure 10 This is a plan view showing the panel, i.e., the base fabric 138, that forms the fourth chamber 38. Figure 10 In the middle, the dashed line surrounding the outer edge and the vent 170b represents the suture line.

[0065] like Figure 10 As shown in (B), the fourth chamber 38 is shaped into a bag by folding a panel 138 in half. An exhaust port 170b, which is connected to the exhaust port 170a of the third chamber, is formed near the center of the long side of the panel 138, and the center line along the long side of the exhaust port 170b becomes the fold line of the panel 138.

[0066] Figure 11 It is used for explanation Figures 7 to 10 The diagram shows the connection plan of the panels. Furthermore, Figure 12 It is shown Figures 7 to 10 A plan view showing the connection status of the panels. (See attached image.) Figure 11 As shown, the first chamber 32 and the second chamber 34, which are integrated, have the largest capacity, followed by the side chamber 40. In addition, the third chamber 36 has a smaller capacity, and the fourth chamber 38 has an even smaller capacity.

[0067] The second chamber 34 and the third chamber 36 are connected by suturing only around the exhaust ports 150a and 150b. Furthermore, the third chamber 36 and the fourth chamber 38 are connected by suturing only around the exhaust ports 170a and 170b.

[0068] (Airbag deployment)

[0069] In the airbag device 20 of this embodiment, when a vehicle collision occurs, the inflator 160 is activated, and expanding gas flows from the inflator holding portion 162 located at the rear end of the side chamber 40 into the first chamber 32. When the expanding gas flows into the first chamber 32, the upward portion 132a ( Figure 7 First, it expands, then expands forward in the part 132b. Then, the gas flows from the first chamber 32 into the second chamber 34.

[0070] At this time, because the first chamber 32 and the second chamber 34, or the second chamber 34 and the seat frame are connected by the strap 200 ( Figure 4 The second chamber 34 is connected, so it does not expand forward, but instead bends near the boundary with the first chamber 32 and unfolds towards the front of the occupants, see reference. Figure 4 and Figure 5 Furthermore, when the second chamber 34 expands, such as... Figure 6 As shown, its front end bends upwards, and the exhaust port 150a extends roughly longitudinally.

[0071] Next, the expanding gas flows from the second chamber 34 into the third chamber 36 through the exhaust port 37, and the third chamber 36 expands from the front of the occupant P to near the left side of the head. Since the inner panel 134a of the second chamber 34 and the inner panel 136a of the third chamber 36 are connected around the exhaust port 37, the outward expansion of the third chamber 36, i.e., away from the occupant's head, is constrained, and it forms a curved shape around the head of the occupant P.

[0072] Next, the expanding gas flows from the third chamber 36 into the fourth chamber 38 through the exhaust port 39, and the fourth chamber 38 expands near the left side of the occupant P's head. Since the inner panel 136a of the third chamber 36 and the fourth chamber 36 are connected around the exhaust port 39, the expansion of the fourth chamber 38 outward, i.e., away from the occupant's head, is constrained, and it forms a curved shape around the occupant P's head.

[0073] (Other embodiments)

[0074] Figure 13This is a top view showing the deployed state of the airbag 30 in an airbag device according to another embodiment of the present invention. In this embodiment, unlike the above embodiment, the first chamber 32 and the second chamber 34 are formed as separate chambers.

[0075] The first chamber 32 is formed by bonding two base fabrics 230a and 230b together. Similarly, the second chamber 34 is formed by bonding two base fabrics 231a and 231b together. Furthermore, the area near the front end (i.e., near the end) of the inner panel 230a facing the occupant P in the base fabric forming the first chamber 32 is connected to the area near the end of the inner panel 231a facing the occupant P in the base fabric forming the second chamber 34, opposite to the third chamber 36. An exhaust port is formed at the boundary between the first chamber 32 and the second chamber 34.

[0076] In this invention, a side airbag device that protects the occupant's side can be provided independently of the airbag device 20 on the side of the vehicle seat opposite to the side that houses the airbag device 20. For example, by placing the side airbag device on the so-called proximal side and placing the airbag device 20, which mainly protects the head, on the distal side, sufficient protection for the occupant can be achieved.

[0077] The present invention has been described in conjunction with the above exemplary embodiments. Those skilled in the art will understand that many equivalent modifications and variations can be conceived based on this disclosure. Therefore, the above exemplary embodiments of the present invention are merely illustrative and not restrictive. Various changes can be made to the described embodiments without departing from the spirit and scope of the present invention.

Claims

1. An airbag device housed in a vehicle seat, characterized in that, have: An inflator that generates expanding gas, and, An airbag deploys from near the upper part of the vehicle seat to protect the occupant's head, and... The airbag includes: a first chamber for protecting one side of the occupant; a second chamber connected to the first chamber for protecting the front of the occupant's head; a third chamber connected to the second chamber and deploying from the front of the occupant's head to the other side; and a fourth chamber connected to the third chamber and deploying to the other side of the occupant. The end of the occupant-facing inner panel of the base fabric forming the second chamber is connected to the end of the occupant-facing inner panel of the base fabric forming the third chamber. A first vent is formed in the connection between the second chamber and the third chamber, such that the inner panel of the second chamber and the inner panel of the third chamber are connected around the first vent.

2. The airbag device as described in claim 1, characterized in that, The first chamber and the second chamber are formed into one piece by bonding two base fabrics together.

3. The airbag device as described in claim 2, characterized in that, A curved portion is formed near the boundary between the first chamber and the second chamber, curving towards the occupant's head.

4. The airbag device as described in claim 3, characterized in that, At least one strap is attached to the second chamber, and the bend is formed by the tension of the strap when the airbag deploys.

5. The airbag device as described in claim 1, characterized in that, The first chamber and the second chamber are formed as separate independent chambers.

6. The airbag device as described in claim 5, characterized in that, The first chamber and the second chamber are each formed by bonding two base fabrics together, and, Near the front end of the occupant-facing inner panel of the base fabric forming the first chamber, it connects to the end of the occupant-facing inner panel of the base fabric forming the second chamber, on the opposite side to the third chamber.

7. The airbag device according to any one of claims 1 to 6, characterized in that, The third chamber is formed by bonding at least two base fabrics together.

8. The airbag device according to any one of claims 1 to 6, characterized in that, The fourth chamber is formed by folding a base fabric or bonding two base fabrics together.

9. The airbag device according to any one of claims 1 to 6, characterized in that, The second vent is formed in the connection between the third chamber and the fourth chamber.

10. The airbag device according to any one of claims 1 to 6, characterized in that, The first chamber includes an upwardly extending portion that first expands upwards and a forwardly extending portion connected to the upwardly extending portion.

11. The airbag device as claimed in claim 10, characterized in that, It also includes a side protection chamber connected to the vicinity of the lower end of the upper portion of the first chamber, for protecting the side of the occupant body.

12. The airbag device as claimed in claim 11, characterized in that, The inflator is disposed inside the side protective chamber, and, The configuration is such that expanding gas flows from the side protection chamber to the first chamber, the second chamber, the third chamber, and the fourth chamber.

13. The airbag device according to any one of claims 1 to 6, characterized in that, The second chamber extends downward from the first chamber, and, When the airbag deploys, the end of the second chamber that connects to the third chamber bends upward.

14. The airbag device according to any one of claims 1 to 6, characterized in that, On the side of the vehicle seat opposite to the side where the airbag device is housed, a side airbag device for protecting the side of the occupant is provided independently of the airbag device.

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