Air bag device

Abstract

To improve occupant safety in a case where a collision from a side of a vehicle V occurs.SOLUTION: An air bag device comprises an air bag part 200 that, when a collision occurs to a vehicle V, inflates and expands air chambers 210 to 240 connected in an annular shape toward the inner side in a vehicle width direction of an occupant P1. The air chambers 210 to 240 include: air chambers 210 and 220 which extend in a vehicle front-rear direction on an upper side and a lower side of the vehicle; and air chambers 230 and 240 which extend in a vehicle up-down direction on a front side and a rear side of the vehicle. Between the air chambers 210 and 220, a base fabric 300 having a length shorter than the length in the vehicle up-down direction of the air chambers 230 and 240 is joined. Between the air chambers 230 and 240, a base fabric 310 is joined in a vehicle front-rear direction. When the air bag part 200 is inflated and expanded, the air chambers 230 and 240 bend toward the inner side in the vehicle width direction of the occupant P1.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an airbag device.

Background Art

[0002] In recent years, as a safety device for protecting occupants during vehicle collisions, airbag devices have already been widely put into practical use and have become popular. As one of the above-mentioned airbag devices, a far-side airbag device that protects an occupant by suppressing the behavior of the occupant generated by a side collision when a side collision occurs with respect to the host vehicle has also been put into practical use.

[0003] As this type of airbag device, for example, an airbag that restrains an occupant by deploying from the side portion of a seat, and an external tether extending in the longitudinal direction of the airbag on the outer surface on the occupant side of the airbag are provided. The external tether is configured to regulate the longitudinal deployment length of the airbag, and pleats formed by folding the base fabric portion are provided on the surface of the base fabric portion forming the airbag on the side opposite to the occupant. (For example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the airbag device described in Patent Document 1 above, when a collision occurs from the side of the vehicle and the airbag expands and deploys, the airbag curves so that the occupant side is concave, and the upper part of the airbag quickly restrains and receives the head of the occupant. However, since no consideration has been given to the contact between the occupant sitting on the seat equipped with the airbag device and another occupant sitting on the adjacent seat, there has been a problem that the adjacent occupants may come into contact with each other.

[0006] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide an airbag device that improves the safety of an occupant when a vehicle collision occurs.

Means for Solving the Problems

[0007] One or more embodiments of the present invention include an airbag portion in which a plurality of annularly connected air chambers expand and deploy inside the occupant in the vehicle width direction when a vehicle collision occurs. The air chambers include at least a first air chamber and a second air chamber extending in the vehicle longitudinal direction on the upper side and the lower side of the vehicle, and a third air chamber and a fourth air chamber extending in the vehicle vertical direction on the front side and the rear side of the vehicle. A first base fabric having a length shorter than the length of the third air chamber and the fourth air chamber in the vehicle vertical direction is joined between the first air chamber and the second air chamber, and a second base fabric is joined between the third air chamber and the fourth air chamber in the vehicle longitudinal direction. When the airbag portion expands and deploys, the third air chamber and the fourth air chamber are bent toward the inside of the occupant in the vehicle width direction, and an airbag device is proposed.

Effects of the Invention

[0008] According to one or more embodiments of the present invention, the safety of an occupant when a vehicle collision occurs can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0010] Hereinafter, the airbag device 1 and the airbag device 1A according to the present embodiment will be described with reference to FIGS. 1 to 8. The arrow FR appropriately shown in the drawings indicates the vehicle traveling direction of the vehicle V shown in FIG. 1, the arrow UP indicates the upper side of the vehicle V, and the arrow RH indicates the right side when facing the vehicle traveling direction. In the following description, when the vertical, front-rear, and left-right directions are used for explanation, unless otherwise specified, the vertical direction when facing the vehicle traveling direction, the front-rear direction with the vehicle traveling direction as the front, and the left-right direction when facing the vehicle traveling direction are indicated. The driver's seat may be on the left side or the right side when facing the vehicle traveling direction in the vehicle V.

[0011] <Embodiment> The configuration of the airbag device 1 according to the present embodiment will be described with reference to FIGS. 1 to 4. In the embodiment, a case where the airbag device 1 is provided on the left seating seat S1 when facing the vehicle traveling direction will be described. Note that the airbag device 1 is provided inside the vehicle width direction of the occupant P1. For example, the airbag device 1 may be housed in the center console. Alternatively, the airbag device 1 may be housed in an adjacent seat.

[0012] <Regarding the airbag device 1> The airbag device 1 is provided inside the vehicle width direction of the occupant P1 and is housed in the seating seat S1 as a vehicle seat, for example, as shown in FIG. 1. The airbag device 1 includes an airbag portion 200 and an inflater IF.

[0013] <Regarding the seating seat S1> The vehicle V is provided with a seating seat S1 on which the occupant P1 sits. In the following, it will be described on the assumption that the seating seat S1 is the seating seat on the driver's seat side.

[0014] As shown in Fig. 2, the seating seat S1 is composed of a seat back portion 100, a seat cushion portion 110, and a headrest portion 120. Inside the seat back portion 100, a back frame portion BF is provided, and an airbag portion 200 and an inflator IF are housed. A seat frame portion SF is provided in the seat cushion portion 110, and a part of the airbag portion 200 is housed therein.

[0015] The seat back portion 100 supports the back from the waist of the occupant P1. The seat back portion 100 is disposed in an upright state in the vehicle vertical direction on the vehicle rear side of the seat cushion portion 110. A part of the airbag portion 200 is housed in a folded state inside the seat back portion 100 on the inner side in the vehicle width direction. Inside the seat back portion 100, a back frame portion BF serving as the skeleton of the seat back portion 100 is provided. The back frame portion BF is provided with a seat rotation shaft SR extending in the vehicle width direction on the lower side of the vehicle. The seat back portion 100 is fixed to the seat cushion portion 110 so as to be tiltable in the vehicle front-rear direction with the seat rotation shaft SR as the rotation axis. An inflator IF described later is fixed to the back frame portion BF. The surface side of the seat back portion 100 is covered with a seat cover formed of a member such as cloth or leather. A sewing portion SW shown by the thick solid line in Fig. 2 is provided on the seat cover of the seat back portion 100. The sewing portion SW is provided as an opening through which the airbag portion 200 can protrude toward the upper front side of the vehicle when a collision occurs in the vehicle V.

[0016] The seat cushion portion 110 is the seating surface of the occupant P1, is disposed at the lower side of the vehicle of the seating seat S1, and supports the buttocks and thighs of the occupant P1. The surface side of the seat cushion portion 110 is covered with a seat cover formed of a member such as cloth or leather.

[0017] The headrest portion 120 is provided at the center in the vehicle width direction of the upper end of the seat back portion 100 in the vehicle, and protrudes upward from the seat back portion 100. A substantially long bar-shaped stay (not shown) is provided on the headrest portion 120. The stay is inserted into the seat back portion 100 from above the vehicle, and the headrest portion 120 is supported by the seat back portion 100. The surface side of the headrest portion 120 is covered with a seat cover formed of a member such as cloth or leather.

[0018] <Regarding the airbag portion 200> The airbag portion 200 is housed inside the vehicle width direction of the occupant P1 in the seating seat S1. When a collision occurs in the vehicle V, the air chambers 210 to 240 as a plurality of annularly connected air chambers expand and deploy toward the inside in the vehicle width direction of the occupant P1. The airbag portion 200 is housed inside the vehicle width direction of the seat back portion 100 and the seat cushion portion 110. The airbag portion 200 is formed of a member such as a base fabric material, and has a plurality of cylindrical air chambers connected in an annular shape as shown in FIG. 3. In the airbag portion 200, an air chamber 210 as a first air chamber, an air chamber 220 as a second air chamber, an air chamber 230 as a third air chamber, and an air chamber 240 as a fourth air chamber are provided in an annular connection.

[0019] (Regarding the air chambers 210 to 240) When the airbag portion 200 expands and deploys, the air chambers 210 to 240 in the airbag portion 200 expand and deploy toward the inside in the vehicle width direction of the occupant P1. Specifically, for example, inside the vehicle width direction of the occupant P1 sitting on the seating seat S1, the air chambers 210 to 240 expand and deploy from the upper inner side of the vehicle of the seat back portion 100 and the seat cushion portion 110 in the seating seat S1 to the lower inner side of the vehicle. The air chambers 210 to 240 are formed in a bag shape sealed by sewing a plurality of base fabric materials, and constitute the airbag portion 200 by being connected in an annular shape.

[0020] The air chamber 210 has a cylindrical shape made of a base fabric material or the like, and expands and deploys in the vehicle front-rear direction above the vehicle of the airbag portion 200. As shown in FIGS. 4(a) and 4(b), a base fabric 300 as a first base fabric is joined to the outside in the vehicle width direction of the air chamber 210. A base fabric 310 as a second base fabric is joined to the inside in the vehicle width direction of the air chamber 210. The front end portion of the air chamber 210 in the vehicle is joined to the upper end portion of the air chamber 230 in the vehicle, and the rear end portion of the air chamber 210 in the vehicle is joined to the upper end portion of the air chamber 240 in the vehicle.

[0021] The air chamber 220 has a cylindrical shape made of a base fabric material or the like, and expands and deploys in the vehicle front-rear direction below the vehicle of the airbag portion 200. A base fabric 300 is joined to the outside in the vehicle width direction of the air chamber 220. A base fabric 310 is joined to the inside in the vehicle width direction of the air chamber 220. The front end portion of the air chamber 220 in the vehicle is joined to the lower end portion of the air chamber 230 in the vehicle, and the rear end portion of the air chamber 220 in the vehicle is joined to the lower end portion of the air chamber 240 in the vehicle.

[0022] The air chamber 230 has a cylindrical shape made of a base fabric material or the like, and expands and deploys in the vehicle up-down direction at the front side of the airbag portion 200. The air chamber 230 is joined to the front end portion of the air chamber 210 in the vehicle above the vehicle of the airbag portion 200, and is joined to the front end portion of the air chamber 220 in the vehicle below the vehicle of the airbag portion 200.

[0023] The air chamber 240 has a cylindrical shape made of a base fabric material or the like, and expands and deploys in the vehicle up-down direction at the rear side of the airbag portion 200. The air chamber 240 is joined to the rear end portion of the air chamber 210 in the vehicle above the vehicle of the airbag portion 200, and is joined to the rear end portion of the air chamber 220 in the vehicle below the vehicle of the airbag portion 200. A plurality (for example, seven as shown in FIGS. 4(a) and 4(b)) of base fabrics 310 as a second base fabric are joined between the air chamber 230 and the air chamber 240 by sewing or the like. The lower rear side of the air chamber 240 in the vehicle is fixed to the back frame portion BF.

[0024] <Regarding the base fabrics 300 and 310> The base fabric 300 as the first base fabric and the base fabric 310 as the second base fabric form a substantially rectangular shape by members such as the base fabric material. The base fabrics 300 and 310 are stored in a folded state together with the air chambers 210 to 240 inside the seat back portion 100 of the seating seat S1. When the airbag portion 200 is inflated and deployed, the base fabrics 300 and 310 maintain a state of being stretched tightly without loosening by the inflation force of the air chambers 210 to 240.

[0025] For the base fabric 300, the upper side portion of the vehicle of the base fabric 300 is joined to the air chamber 210, and the lower side portion of the vehicle of the base fabric 300 is joined to the air chamber 220. The base fabric 300 forms a substantially rectangular shape having a width up to both ends in the longitudinal direction of the vehicle of the air chambers 210 and 220. The base fabric 300 has a length shorter than the length in the vertical direction of the vehicle in the air chambers 230 and 240 between the air chambers 210 and 220. Therefore, as shown in FIG. 4(b), when the airbag portion 200 is inflated and deployed, the air chambers 230 and 240 are bent inward in the vehicle width direction at the bending portion BD. The base fabric 300 maintains a state of being stretched tightly without loosening in the vertical direction of the vehicle by the inflation force of the air chambers 210 and 220.

[0026] As shown in FIG. 4(a), when the airbag portion 200 is inflated and deployed, the base fabric 310 forms a substantially rectangular shape having the longitudinal direction of the vehicle as the long side, has a gap GP in the vertical direction of the vehicle, and is joined in a plurality between the air chambers 230 and 240 adjacent to each other. For the base fabric 310, the front side portion of the vehicle of the base fabric 310 is joined to the air chamber 230, and the rear side portion of the vehicle of the base fabric 310 is joined to the air chamber 240. The base fabric 310 maintains a state of being stretched tightly without loosening in the longitudinal direction of the vehicle by the inflation force of the air chambers 230 and 240.

[0027] <Regarding the inflator IF> When a collision occurs in the vehicle V, the inflator IF supplies gas to the airbag portion 200. The inflator IF is fixed to the back frame portion BF in the seat back portion 100.

[0028] <Function and effect> In the airbag device 1 according to the present embodiment configured as described above, the operation when a collision occurs from the passenger seat side in the vehicle V will be described with reference to FIGS. 5 and 6.

[0029] (When an occupant is seated on the driver's seat side) In a state where the occupant P1 is seated on the seating seat S1 on the driver's seat side, when a collision occurs from the passenger seat side in the vehicle V as indicated by the arrow IM in FIG. 5, gas is supplied from the inflator IF to the airbag portion 200, and the airbag portion 200 expands and deploys toward the front side of the upper part of the vehicle on the inner side in the vehicle width direction of the occupant P1. The airbag portion 200 opens the sewing portion SW by the expansion force of the gas filled in the airbag portion 200 and protrudes toward the front side of the upper part of the vehicle. The airbag portion 200 protruding from the sewing portion SW further has gas supplied from the inflator IF, and the air chambers 210 to 240 connected in a ring shape expand and deploy. Since the base fabric 300 has a length shorter than the length in the vehicle up-and-down direction in the air chambers 230 and 240, when the airbag portion 200 expands and deploys, the air chambers 230 and 240 protrude while bending toward the inner side in the vehicle width direction of the occupant P1 at the bending portion BD. At this time, since the air chambers 210 to 240 of the airbag portion 200 are connected in a ring shape, the supply of gas from the inflator IF to the air chambers 210 to 240 becomes easy, and the airbag portion 200 expands and deploys in a short time.

[0030] When an occupant P1 is seated on the seating seat S1 and a collision occurs from the passenger seat side, due to the reaction of the impact caused by the collision, the occupant P1 moves toward the inner side in the vehicle width direction as indicated by the arrow AR1.

[0031] In the airbag portion 200, the air chambers 210 and 220 expand and deploy in the vehicle front-rear direction, and the air chambers 230 and 240 expand and deploy in the vehicle vertical direction. As a result, the base fabric 300 joined between the air chambers 210 and 220 maintains a state of being tightly stretched in the vehicle vertical direction. Therefore, as shown by the arrows AR2 and AR3, the base fabric 300 is pulled in the vehicle vertical direction. The head and waist of the occupant P1 moving inward in the vehicle width direction are received by the air chambers 210 and 220, and the movement inward in the vehicle width direction is restricted. Further, the head and shoulders of the occupant P1 are received by the base fabric 300, and the movement inward in the vehicle width direction is restricted.

[0032] (When there is also an occupant sitting on the passenger seat side) In a state where the occupant P1 is seated on the seating seat S1 and further the occupant P2 is seated on the seating seat S2 on the passenger seat side, as shown in FIG. 6, due to the reaction of the impact caused by the collision, the occupants P1 and P2 may move in a direction approaching each other inward in the vehicle width direction.

[0033] In a state where the occupant P1 is seated on the seating seat S1 and further the occupant P2 is seated on the seating seat S2, when a collision occurs from the passenger seat side in the vehicle V as shown by the arrow IM in FIG. 6, gas is supplied from the inflator IF to the airbag portion 200, and the airbag portion 200 expands and deploys the inner sides of the occupants P1 and P2 in the vehicle width direction toward the front side of the vehicle upper part.

[0034] In the airbag portion 200, the air chambers 210 and 220 expand and deploy in the vehicle front-rear direction, and the air chambers 230 and 240 expand and deploy in the vehicle vertical direction. Therefore, the base fabric 300 joined between the air chambers 210 and 220 maintains a state of being tightly stretched in the vehicle vertical direction shown by the arrows AR2 and AR3. The base fabric 310 joined between the air chambers 230 and 240 maintains a state of being tightly stretched in the vehicle front-rear direction.

[0035] Furthermore, when the air chambers 230 and 240 are bent inward in the vehicle width direction, a reaction force that pushes back in the direction indicated by arrow AR5 is generated in the airbag portion 200 when a pressing force is applied in the direction indicated by arrow AR4.

[0036] When a collision occurs from the passenger seat side, the occupant P1 moves in the direction indicated by arrow AR1 due to the reaction of the impact caused by the collision. When a collision occurs from the passenger seat side, the occupant P2 moves in the direction indicated by arrow AR4 due to the reaction of the impact caused by the collision. In other words, the occupant P1 and the occupant P2 may move in a direction approaching each other.

[0037] In the case of the occupant P1, the head and waist of the occupant P1 moving in the direction indicated by arrow AR1 are received by the air chambers 210 and 220, and the head and shoulders of the occupant P1 are received by the base fabric 300, so that the movement of the occupant P1 in the direction indicated by arrow AR1 is restricted.

[0038] In the case of the occupant P2, the head, shoulders, and waist of the occupant P2 moving inward in the vehicle width direction are received by different base fabrics 310 because a plurality of the base fabrics 310 are joined between the air chambers 230 and 240. And since a gap GP is provided between the base fabrics 310, the head, shoulders, or waist of the occupant P2 is received by each base fabric 310 so as to be wrapped according to the individual shape of the head, shoulders, or waist of the occupant P2. Furthermore, when the base fabric 310 receives the head, shoulders, and waist of the occupant P2 due to the air chambers 230 and 240 being bent inward in the vehicle width direction, the base fabric 310 pushes back the occupant P2 in the direction indicated by arrow AR5. The head of the occupant P2 moving in the direction indicated by the arrow AR4 is received by the air chamber 210, thereby restricting the movement in the direction indicated by the arrow AR4. The head, shoulders, and waist of the occupant P2 are received by the base fabric 310, thereby restricting the movement of the occupant P2 in the direction indicated by the arrow AR4.

[0039] Then, when the gas supply from the inflator IF ends, the inflation and deployment of the airbag portion 200 end.

[0040] As described above, when a collision occurs from the side of the vehicle V, the airbag device 1 inflates and deploys the airbag portion 200 in a short time because the air chambers 210 to 240 are connected annularly. By receiving the heads and upper bodies of the occupant P1 by the air chambers 210 to 240 and the base fabric 300 in the airbag portion 200, the airbag device 1 restricts the movement of the occupant P1 toward the inner side in the vehicle width direction. When the occupant P2 is seated on the passenger seat side seating seat S2, the air chambers 210 to 240 and the plurality of base fabrics 310 receive the head and upper body of the occupant P2. Further, the air chambers 230 and 240 bent toward the inner side in the vehicle width direction push back the occupant P2 from the outside to the inside of the vehicle, whereby the airbag device 1 restricts the movement of the occupant P2 toward the inner side in the vehicle width direction. Therefore, when a collision occurs from the side of the vehicle V, the airbag device 1 restricts the movement of the upper bodies and heads of the occupant P1 and the occupant P2 in the direction of approaching each other.

[0041] As described above, the airbag device 1 according to the present embodiment is housed inside the vehicle width direction of the occupant P1, and when a collision occurs in the vehicle V, air chambers 210 to 240 as a plurality of annularly connected air chambers expand and deploy inside the vehicle width direction of the occupant P1. The airbag unit 200 is provided. The air chambers 210 to 240 include, at least on the upper side and the lower side of the vehicle, an air chamber 210 as a first air chamber extending in the vehicle front-rear direction and an air chamber 220 as a second air chamber, and on the front side and the rear side of the vehicle, an air chamber 230 as a third air chamber extending in the vehicle vertical direction and an air chamber 240 as a fourth air chamber are provided. A base fabric 300 as a first base fabric having a length shorter than the vehicle vertical length of the air chambers 230 and 240 is joined between the air chamber 210 and the air chamber 220, and a base fabric 310 as a second base fabric is joined between the air chamber 230 and the air chamber 240 in the vehicle front-rear direction. When the airbag unit 200 expands and deploys, the air chambers 230 and 240 are bent inward in the vehicle width direction. That is, when a collision occurs from the side of the vehicle V, the airbag device 1 expands and deploys the air chambers 210 to 240 annularly connected in the airbag unit 200 in a short time. When the air chamber 210 and the air chamber 220 expand and deploy in the vehicle front-rear direction, and the air chamber 230 and the air chamber 240 expand and deploy in the vehicle vertical direction, the base fabric 300 joined between the air chamber 210 and the air chamber 220 maintains a state of being tightly stretched in the vehicle vertical direction. The base fabric 310 joined between the air chamber 230 and the air chamber 240 maintains a state of being tightly stretched in the vehicle front-rear direction. Furthermore, when the air chambers 230 and 240 are bent inward in the vehicle width direction, when a pressing force is applied from the inside to the outside in the vehicle width direction to the airbag unit 200, a reaction force that pushes back from the outside to the inside of the vehicle is generated. When the occupant P1 is seated on the seating seat S1, the air chambers 210, 220 and the base fabric 300 in the airbag unit 200 stably receive the head, shoulders and waist of the occupant P1. When the occupant P2 is seated on the seating seat S2, the air chambers 210 to 240 and the base fabric 310 in the airbag unit 200 receive and wrap around the head, shoulders, and waist of the occupant P2. Further, the air chambers 230 and 240 that are bent inward in the vehicle width direction push back the head, shoulders, and waist of the occupant P2 from the outside to the inside of the vehicle. Therefore, when a collision occurs from the side of the vehicle V, the airbag device 1 can restrict the movement of the upper bodies and heads of the occupants P1 and P2 in the direction of approaching each other. Therefore, the safety of the occupants when a collision occurs in the vehicle V can be improved.

[0042] In the airbag device 1 according to the present embodiment, a plurality of base fabrics 310 are provided with gaps GP in the vehicle vertical direction between the air chambers 230 and 240. That is, when a collision occurs from the side of the vehicle V, the airbag device 1 inflates and deploys the airbag unit 200. When the occupant P2 is seated on the passenger seat side seating seat S2, the air chambers 210 to 240 and the base fabric 310 in the airbag unit 200 receive the head, shoulders, and waist of the occupant P2. The head, shoulders, and waist of the occupant P2 moving inward in the vehicle width direction are received by different base fabrics 310 because a plurality of base fabrics 310 are joined between the air chambers 230 and 240. And because a gap GP is provided between the base fabrics 310, the head, shoulder, or waist of the occupant P2 is received by each base fabric 310 so as to be wrapped according to the individual shape of the head, shoulder, or waist of the occupant P2. Therefore, when a collision occurs from the side of the vehicle V, the airbag device 1 can stably restrict the movement of the upper bodies and heads of the occupants P1 and P2 in the direction of approaching each other by wrapping them. Therefore, the safety of the occupants when a collision occurs from the side of the vehicle V can be improved.

[0043] <Modification Example 1> In the above-described embodiment, the airbag device 1 in which the air chambers 210 to 240 are connected in a ring shape is exemplified. However, for example, as shown in the hatched portion of FIG. 7, an airbag device 1A may be provided in which an air chamber 250 surrounded and coupled by the air chambers 210 to 240 is further provided. At this time, the base fabric 310A may be formed in a substantially rectangular shape between the air chamber 230 and the air chamber 240, or may be formed in a string shape such as a tether. When a collision occurs from the side of the vehicle V, gas is supplied from the inflator IF, and the air chambers 210 to 250 expand and deploy toward the inner side in the vehicle width direction of the occupant P1. The air chamber 210, the air chamber 220, and the base fabric 300 receive the head, shoulders, and waist of the occupant P1. The air chamber 230, the air chamber 240, the air chamber 250, and the base fabric 310A receive the head, shoulders, and waist of the occupant P2. Therefore, when a collision occurs from the side of the vehicle V, the airbag device 1A can receive the occupant P2 so as to wrap the occupant P2 with the air chamber 250 and the plurality of base fabrics 310A. And it is possible to prevent the upper body and head of the occupant P1 and the occupant P2 from approaching each other. Therefore, the safety of the occupant when a collision occurs from the side of the vehicle V can be improved.

[0044] <Modification Example 2> In the present embodiment, the case where the airbag device 1 or the airbag device 1A is mounted on the seating seat at the front side of the vehicle is described. However, the airbag device 1 or the airbag device 1A may be provided on the rear seat. For example, as shown in FIG. 8, when an independent seat is mounted on the rear seat, when a collision occurs from the side of the vehicle V, the airbag portion 200 or the airbag portion 200A expands and deploys toward the inner side in the vehicle width direction of the rear seating seats S3 and S4. By the airbag portion 200 or the airbag portion 200A protruding toward the inner side in the vehicle width direction, it is possible to prevent the upper body and head of the occupant P3 and the occupant P4 from approaching each other. Therefore, the safety of the occupant when a collision occurs from the side of the vehicle V can be improved.

[0045] In addition, although the case where the rear seat is an independent seat is exemplified in the second modification, for example, the airbag device 1 or the airbag device 1A may be provided on the rear seat even when the rear seat is a bench seat.

[0046] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and designs and the like within the scope not departing from the gist of the present invention are also included.

Explanation of Signs

[0047] 1; Airbag device 1A; Airbag device 100; Seat back portion 110; Seat cushion portion 120; Headrest portion 200; Airbag portion 200A; Airbag portion 210; Air chamber 220; Air chamber 230; Air chamber 240; Air chamber 250; Air chamber 300; Base fabric 310; Base fabric BF; Back frame portion GP; Gap P1; Occupant P2; Occupant S1; Occupied seat S2; Occupied seat V; Vehicle

Claims

1. An airbag unit in which a plurality of annularly connected air chambers expand and deploy toward the inner side in the vehicle width direction of an occupant when a collision occurs in the vehicle, the air chambers are provided with a first air chamber and a second air chamber extending in the vehicle front-rear direction at least on the upper side and the lower side of the vehicle, and a third air chamber and a fourth air chamber extending in the vehicle up-down direction on the front side and the rear side of the vehicle, a first base fabric having a length shorter than the length in the vehicle up-down direction of the third air chamber and the fourth air chamber is joined between the first air chamber and the second air chamber, a second base fabric is joined between the third air chamber and the fourth air chamber in the vehicle front-rear direction, an airbag device, characterized in that when the airbag unit expands and deploys, the third air chamber and the fourth air chamber are bent toward the inner side in the vehicle width direction of the occupant.

2. The airbag device according to claim 1, characterized in that a plurality of the second base fabrics are provided between the third air chamber and the fourth air chamber with gaps in the vehicle up-down direction.

Images