JP7596809B2 - Side airbag device for vehicle - Google Patents

Description

The present invention relates to a side airbag device for a vehicle.

Patent Document 1 discloses a side airbag that inflates and deploys to the side of an occupant during a side collision. The side airbag disclosed in Patent Document 1 is composed of a head protection inflation section that restrains the occupant's head, a waist protection inflation section that restrains the occupant's waist, and an intermediate inflation section that connects the head protection inflation section and the waist protection inflation section. In addition, Patent Document 1 discloses an inner tube (duct member) disposed inside the intermediate inflation section, which distributes gas generated by the inflator to the head protection inflation section and the waist protection inflation section.

JP 2011-105107 A

To protect occupants in the event of a side collision, it is desirable to restrain the head, waist, and other areas of the body with a high restraining force early on, while also ensuring a sufficient restraining stroke in the seat width direction. In order to restrain the head and waist early on with a high restraining force, it is necessary to increase the internal pressure of the side airbag and improve its deployment speed. Also, in order to ensure a restraining stroke in the seat width direction, it is necessary to ensure a sufficient thickness of the side airbag in the seat width direction when inflated and deployed.

However, if the internal pressure of the side airbag is increased and the deployment speed is improved, the internal volume of the side airbag may be insufficient, making it difficult to obtain a sufficient restraining stroke. On the other hand, if the internal volume of the side airbag is expanded and the thickness in the seat width direction is increased, the internal pressure may be insufficient, making it difficult to obtain a sufficient restraining force or deployment speed. Therefore, the above prior art leaves room for improvement in terms of obtaining a restraining stroke in the seat width direction while restraining the occupant's head or waist early with a high restraining force.

In consideration of the above, the present invention aims to provide a side airbag device for a vehicle that can quickly restrain the head or waist of an occupant with a high restraining force during a side collision while obtaining a restraining stroke in the seat width direction.

The vehicle side airbag device of the present invention described in claim 1 is stored inside a vehicle seat, and is inflated and deployed to the side of an occupant by receiving gas from an inflator when a side collision is predicted or detected, and has a bag body that has an upper chamber that covers the side of the occupant's head and a lower chamber that covers the side of the occupant's waist in the inflated and deployed state, and a slit is formed in the bag body to separate at least one of the upper chamber and the lower chamber into the front and rear in the fore-and-aft direction of the seat, and at least a portion of the front and rear of the chambers separated by the slit are overlapped and sewn in the seat width direction.

In the vehicle side airbag device according to the present invention, a bag body is stored inside a vehicle seat, and when a side collision is predicted or detected, the bag body is supplied with gas from an inflator and inflated and deployed to the side of an occupant. The bag body also includes an upper chamber and a lower chamber, and in an inflated and deployed state, the side of the occupant's head is covered by the upper chamber, and the side of the occupant's waist is covered by the lower chamber. This makes it possible to protect the occupant in the event of a side collision.

In addition, the bag body is formed with a slit that separates at least one of the upper chamber and the lower chamber from the front and rear in the seat front-rear direction. The bag body is slid so that the front and rear parts of the chamber separated by the slit slide, and the front and rear parts of the chamber are overlapped at least partially in the seat width direction and sewn . This makes it possible to obtain a restraining stroke while ensuring a thickness in the seat width direction by overlapping the front and rear parts of the chamber separated by the slit, without the need to increase the internal volume of the upper chamber and the lower chamber. As a result, the internal pressure of the bag body can be increased and the deployment speed can be improved, so that a restraining stroke in the seat width direction can be obtained while restraining the head or waist of the occupant early with a high restraining force during a side collision.

As described above, the vehicle side airbag device according to the present invention has the excellent effect of quickly restraining the head or waist of the occupant with a high restraining force during a side collision while obtaining a restraining stroke in the seat width direction.

1 is a side view showing a vehicle seat to which a vehicle side airbag device according to an embodiment is applied, showing a state in which a bag body is inflated and deployed; 2 is an enlarged cross-sectional view of a main part taken along line 2-2 in FIG. 1; 1A is a reduced side view showing the base fabric of the bag body according to the embodiment, in which (A) is the state before the front and rear parts of the lower chamber in the bag body are overlapped, and (B) is the state after the front and rear parts of the lower chamber are overlapped. 3(B) is an enlarged cross-sectional view of a main part shown enlarged along line 4B-4B in FIG. 3(B); and (C) is an enlarged cross-sectional view of a main part shown enlarged along line 4C-4C in FIG. 3(B). 4 is a reduced cross-sectional view of a main portion of a vehicle side airbag device according to a first modified example of the embodiment, corresponding to FIG. 3 . FIG. FIG. 5 is a reduced cross-sectional view of a main portion corresponding to FIG. 3 and showing a vehicle side airbag device according to a second modified example of the embodiment. FIG. 7 is a reduced cross-sectional view of a main portion corresponding to FIG. 3 and showing a vehicle side airbag device according to a third modified example of the embodiment. FIG. 10 is a reduced cross-sectional view of a main portion corresponding to FIG. 3 and showing a vehicle side airbag device according to a fourth modified example of the embodiment. FIG. 10 is a reduced cross-sectional view of a main portion corresponding to FIG. 3 and showing a vehicle side airbag device according to a fifth modified example of the embodiment.

The vehicle side airbag device 10 according to this embodiment will be described below with reference to Figures 1 to 4. Note that the arrows FR, UP, and RH in each figure respectively indicate the front, upper, and right sides of the vehicle seat 14 on which the vehicle side airbag device 10 is mounted. When describing using front-rear, left-right, top-bottom directions, these directions refer to front-rear in the seat front-rear direction, left-right in the seat width direction, and top-bottom in the seat up-down direction, unless otherwise specified.

(Vehicle seat 14)
1 and 2, a vehicle seat 14 equipped with a vehicle side airbag device 10 according to this embodiment (hereinafter also simply referred to as the "side airbag device 10") includes a seat cushion 16, a seat back 18, and a headrest 20. As an example, the vehicle seat 14 is disposed in the driver's seat on the left side of the vehicle, so that the front of the seat coincides with the front of the vehicle. In addition, the left and right sides of the seat width direction coincide with the left and right sides of the vehicle width direction.

In the vehicle seat 14 shown in Figures 1 and 2, a crash test dummy P is seated in place of an actual occupant. As an example, the dummy P is an AM50 (50th percentile American adult male) of the World Side Impact Dummy (WorldSID). In the following description, the dummy is referred to as "occupant P."

The seat cushion 16 extends in the front-rear and width directions of the seat and is configured to be able to support the buttocks and thighs of the occupant P. The seat back 18 is rotatably connected to the rear end of the seat cushion 16 and extends in the up-down direction of the seat and is configured to be able to support the back of the occupant P. The headrest 20 is provided at the upper end of the seat back 18 and is configured to be able to support the head H of the occupant P.

Although not shown, the occupant P is restrained to the vehicle seat 14 by a seat belt device. The seat belt device is configured to include a belt-like webbing that restrains the occupant's upper body and waist L. When worn, the webbing includes a shoulder belt that extends diagonally from the occupant's left shoulder S to the right waist L of the occupant P, and a lap belt that extends from the right side of the occupant's waist L to the left side. The seat belt device restrains the occupant's upper body P to the seat back 18 with the shoulder belt, and the lap belt restrains the occupant's waist L to the seat cushion 16.

(Vehicle side airbag device 10)
The side airbag device 10 includes a bag body 12, an inflator 42, and a sock 44.

The bag body 12 is stored inside the seat back 18 and is inflated by the gas generated by the inflator 42. The bag body 12 is inflated and deployed laterally outward in the seat width direction relative to the occupant P by breaking the outer skin of the seat back 18 due to the inflation pressure.

The bag body 12 is configured to include an upper chamber 12A that is inflated and deployed on the seat width outer side of the head H of the occupant P to cover the sides of the head H, and a lower chamber 12B that is inflated and deployed below the head H of the occupant to cover the seat width outer side of the shoulders S to the waist L. The bag body 12 is configured as an integrated bag body in which the upper chamber 12A and the lower chamber 12B are connected. Details of the bag body 12 will be described later.

The inflator 42 is a cylindrical gas generating device formed in a substantially cylindrical shape, with its axial direction aligned with the side frame 54 (see FIG. 3) that constitutes the framework of the seat back 18. A gas ejection section 42A is provided at the lower end of the inflator 42, and gas is generated from the gas ejection section 42A and supplied to the bag body 12 when a side collision of the vehicle is detected or predicted.

As shown in FIG. 1, the inflator 42 is disposed inside the bag body 12. A stud bolt (not shown) extends from the outer surface of the inflator 42 toward the inside in the seat width direction. The inflator 42 is fastened to the side frame 54 by inserting the stud bolt into the side frame 54 and tightening it with a nut.

As shown in Figures 1 and 2, a sock 44 is provided inside the bag body 12. The sock 44 is also called a duct, inner tube, flow straightening cloth, or diffuser.

The sock 44 is formed in a generally cylindrical shape with open upper and lower ends, and extends in the up-down direction of the seat from the upper chamber 12A to the lower chamber 12B. A bag-shaped inflator insertion section 46 is integrally provided at the rear end of the sock 44, and the gas ejection section 42A of the inflator 42 is connected to the inside of the sock 44 via the inflator insertion section 46. Therefore, the gas generated from the inflator 42 is configured to flow through the sock 44 to the upper chamber 12A and the lower chamber 12B.

The sock 44 is formed by sewing two pieces of base fabric arranged in the seat width direction. Specifically, the two pieces of base fabric that make up the sock 44 are sewn together at their front and rear ends. Although not shown, the base fabric on the inner side in the seat width direction that makes up the sock 44 is sewn to the bag body 12 at multiple points.

(Bag body 12)
Next, the details of the bag body 12 will be described. As shown in Figures 2 and 3, the bag body 12 is formed into a bag shape by sewing the outer peripheries of two base fabrics 50, 52 arranged in the seat width direction. In Figures 2 and 3, the sewing portion where the outer peripheries of the base fabrics 50, 52 are sewn is indicated by the symbol "S1".

The upper part of the bag body 12 is an upper chamber 12A that covers the sides of the head H of the occupant P when inflated and deployed. When viewed from the seat width direction, the upper chamber 12A is formed in a roughly C-shape with a slit facing the lower side of the seat.

The lower part of the bag body 12, when inflated and deployed, forms a lower chamber 12B that covers the sides of the area extending from the occupant's shoulders S to the waist L. When viewed from the seat width direction, the lower chamber 12B is formed in a long bag shape in the seat vertical direction, and its width in the seat front-rear direction increases toward the lower side of the seat.

As shown in FIG. 3A, the lower chamber 12B is separated into a front portion 12B1 and a rear portion 12B2 in the seat front-rear direction by a slit 30 extending in the up-down direction. The slit 30 extends upward from the lower end of the lower chamber 12B along the seat back 18, and reaches the middle portion of the lower chamber 12B in the seat up-down direction. In this embodiment, as an example, the size of the internal volume of the rear portion 12B2 of the lower chamber 12B is set smaller than that of the front portion 12B1 from the viewpoint of improving the internal pressure and deployment speed during inflation and deployment.

As shown in FIG. 3B, the lower chamber 12B is overlapped with the rear portion 12B2 in the seat width direction by sliding the front portion 12B1 toward the rear of the seat. In this embodiment, approximately half of the rear area of the front portion 12B1 of the lower chamber 12B overlaps with the rear portion 12B2 on the inside in the seat width direction. The lower ends of the front portion 12B1 and the rear portion 12B2 of the lower chamber 12B are sewn together and joined at the stitching portion S2. In this state, the front portion 12B1 and the rear portion 12B2 of the lower chamber 12B are positioned so as to overlap the waist region L of the occupant P when viewed from the seat width direction.

When the front portion 12B1 of the lower chamber 12B is slid toward the rear portion 12B2, a roughly triangular folded portion 32 is formed near the upper end of the slit 30. As shown in Figures 4(A) to 4(C), the folded portion 32 is formed by folding the base fabric 50, 52 of the lower chamber 12B alternately in mountain folds and valley folds, and the overlap t between the mountain folds and the valley folds increases from t1 at the front of the seat to t3 at the rear of the seat.

In the present embodiment, the bag body 12 is folded and stored inside the seat back 18 together with the sock 44. When gas is generated by the inflator 42, gas is first supplied to the rear portion 12B2 of the lower chamber 12B from the opening at the lower end of the sock 44. The internal volume of the rear portion 12B2 is set smaller than that of the front portion 12B1 in order to prioritize the improvement of the internal pressure and the deployment speed as described above. Therefore, the rear portion 12B2 of the lower chamber 12B completes the expansion and deployment at the beginning of a side collision, and is capable of restraining the lumbar region L of the occupant P with a high restraining force. Then, as the internal pressure of the lower chamber 12B increases, the folded portion 32 formed in the front portion 12B1 is released and gas is supplied inside the front portion 12B1. At this time, the folded portion 32 is released in order from the front of the seat, which has a small folding margin t, to the rear, and the amount of gas supplied to the front portion 12B1 can be gradually increased. As a result, the lower chamber 12B completes the inflation and deployment of the front portion 12B1 after the rear portion 12B2. In this state, as shown in FIG. 2, the lower chamber 12B completes the inflation and deployment with the front portion 12B1 and the rear portion 12B2 overlapping in the seat width direction on the side of the occupant P's waist L, and the thicknesses of the front portion 12B1 and the rear portion 12B2 overlap in the seat width direction, so that the restraining stroke of the waist L can be sufficiently secured. On the other hand, in the upper chamber 12A, when gas is supplied to the upper chamber 12A, the skin of the upper end of the seat back 18 is broken by the inflation pressure of the upper chamber 12A, and the upper chamber 12A is configured to inflate and deploy toward the space between the shoulder belt and the headrest 20 (not shown). The folding method of the bag body 12 and the sock 44 is not particularly limited, and various folding methods can be adopted.

(Action and Effects)
Next, the operation and effects of this embodiment will be described.

In the side airbag device 10 of this embodiment, a bag body 12 is stored inside a vehicle seat 14, and this bag body 12 receives gas from an inflator 42 when a side collision is predicted or detected, and is inflated and deployed to the side of an occupant P. The bag body 12 also has an upper chamber 12A and a lower chamber 12B, with the upper chamber 12A covering the side of the head H of the occupant P, and the lower chamber 12B covering the side of the waist L of the occupant P. This makes it possible to protect the occupant P in the event of a side collision.

The bag body 12 is also formed with a slit 30 that separates the lower chamber 12B from the front and rear in the seat front-rear direction. The bag body 12 is formed by sliding the front part 12B1 and the rear part 12B2 of the lower chamber 12B separated by the slit 30, and sewing them together with at least a part overlapping in the seat width direction. Specifically, in this embodiment, the rear half of the front part 12B1 of the lower chamber 12B overlaps the rear part 12B2 when viewed from the seat width direction. This allows the seat width direction thickness of the bag body 12 to be secured and the restraining stroke of the waist part L to be obtained by overlapping the front part 12B1 and the rear part 12B2 of the lower chamber 12B separated by the slit 30 without the need to increase the internal volume of the lower chamber 12B. As a result, the internal pressure of the bag body 12 can be increased and the deployment speed can be improved, so that the restraining stroke in the seat width direction can be obtained while restraining the waist part L of the occupant P early with a high restraining force during a side collision.

(First Modification)
Next, a vehicle side airbag device 60 according to a first modified example of this embodiment will be described with reference to Fig. 5. The vehicle side airbag device 60 has a bag body 62 including an upper chamber 62A and a lower chamber 62B, as in the above embodiment. The bag body 62, the upper chamber 62A, and the lower chamber 62B correspond to the bag body 12, the upper chamber 12A, and the lower chamber 12B in the above embodiment. However, in this first modified example, the upper chamber 62A is separated in the front-rear direction of the seat by a slit 64, and no slit is formed in the lower chamber 62B. The other configurations are the same as those in the above embodiment.

The bag body 62 is formed into a long bag shape in the vertical direction by sewing the outer periphery of two base fabrics arranged in the seat width direction. The upper chamber 62A has a larger dimension in the front-rear direction of the seat toward the upper side of the seat. As shown in FIG. 5(A), the upper chamber 62A is separated into a front part 62A1 and a rear part 62A2 in the front-rear direction of the seat by a slit 64 extending in the vertical direction. The slit 64 extends downward from the upper end of the upper chamber 62A along the seat back 18 and reaches the lower end of the upper chamber 62A in the vertical direction of the seat. In this embodiment, as an example, the size of the internal volume of the rear part 62A2 of the upper chamber 62A is set smaller than that of the front part 62A1 from the viewpoint of improving the internal pressure and deployment speed during inflation and deployment. As shown in FIG. 5(B), the upper chamber 62A is overlapped in the seat width direction with the rear part 62A2 by sliding the front part 62A1 toward the rear side of the seat. In this embodiment, approximately half of the rear area of the front portion 62A1 of the upper chamber 62A overlaps with the rear portion 62A2 on the outside in the seat width direction. The upper ends of the front portion 62A1 and the rear portion 62A2 of the upper chamber 62A are sewn together and joined at the stitching portion S3. In this state, the front portion 62A1 and the rear portion 62A2 of the upper chamber 62A are positioned so as to overlap the head H of the occupant P when viewed from the seat width direction.

In the vehicle side airbag device 60 according to the first modified example described above, the bag body 62 is formed with a slit 64 that separates the upper chamber 62A from the front and rear in the seat front-rear direction. The bag body 62 is formed by sliding the front part 62A1 and the rear part 62A2 of the lower chamber 62B separated by the slit 64, overlapping them in the seat width direction, and sewing them. This allows the thickness of the bag body 62 in the seat width direction to be secured and the restraining stroke of the head H to be obtained by overlapping the front part 62A1 and the rear part 62A2 of the upper chamber 62A separated by the slit 64 without the need to increase the internal volume of the upper chamber 62A. As a result, the internal pressure of the bag body 62 can be increased and the deployment speed can be improved, so that the restraining stroke in the seat width direction can be obtained while restraining the head H of the occupant P early with a high restraining force during a side collision.

(Second Modification)
Next, a vehicle side airbag device 70 according to a second modified example of this embodiment will be described with reference to Fig. 6. The vehicle side airbag device 70 has a bag body 72 including an upper chamber 72A and a lower chamber 72B, as in the above embodiment. The bag body 72, the upper chamber 72A, and the lower chamber 72B correspond to the bag body 12, the upper chamber 12A, and the lower chamber 12B in the above embodiment. However, in this second modified example, the upper chamber 72A and the lower chamber 72B are separated in the front-rear direction of the seat by a slit 74. The other configurations are the same as those in the above embodiment.

The bag body 72 is formed into a vertically long bag shape by sewing the outer periphery of two base fabrics arranged in the seat width direction. The upper chamber 72A of the bag body 72 increases in the seat front-rear direction dimension toward the upper side of the seat. The lower chamber 72B of the bag body 72 increases in the seat front-rear direction dimension toward the lower side of the seat.

6A, the upper chamber 72A and the lower chamber 72B are separated in the front-rear direction of the seat by a vertically extending slit 74. The slit 74 formed in the upper chamber 72A extends downward from the upper end of the upper chamber 72A along the seat back 18. On the other hand, the slit 74 formed in the lower chamber 72B extends upward along the seat back 18 from the lower end of the lower chamber 72B.
In this embodiment, the size of the internal volume of the rear parts 72A2, 72B2 of the upper chamber 72A and the lower chamber 72B is set smaller than that of the front parts 72A1, 72B1 in order to improve the internal pressure and deployment speed during inflation and deployment. As shown in FIG. 6B, the front parts 72A1, 72B1 are slid toward the rear of the seat and overlap the rear parts 72A2, 72B2 in the seat width direction. In this embodiment, the rear half of the front parts 72A1, 72B1 of the upper chamber 72A and the lower chamber 72B overlap the rear parts 72A2, 72B2 on the outer side in the seat width direction. In the upper chamber, the upper ends of the front part 72A1 and the rear part 72A2 are sewn and joined together at the sewing part S4. In the lower chamber 72B, the upper ends of the front part 72B1 and the rear part 72B2 are sewn and joined together at the sewing part S5. In this state, the front 72A1 and rear 72A2 of the upper chamber 72A are positioned so as to overlap the head H of the occupant P when viewed from the seat width direction, and the front 72B1 and rear 72B2 of the lower chamber 72B are positioned so as to overlap the waist L of the occupant P when viewed from the seat width direction.

In the vehicle side airbag device 70 according to the second modified example described above, similar to the above embodiment and the first modified example, the head H and waist L of the occupant P can be restrained early with a high restraining force during a side collision while obtaining a restraining stroke in the seat width direction.

(Third Modification)
Next, a vehicle side airbag device 80 according to a third modified example of this embodiment will be described with reference to Fig. 7. The vehicle side airbag device 80 has a bag body 82 including an upper chamber 82A and a lower chamber 82B, as in the above embodiment. The bag body 82, the upper chamber 82A, and the lower chamber 82B correspond to the bag body 12, the upper chamber 12A, and the lower chamber 12B in the above embodiment. However, in this third modified example, the lower chamber 82B is separated in the front-rear direction of the seat by a slit 84 extending downward from the upper end of the lower chamber 82B. The other configurations are the same as those in the above embodiment.

The bag body 82 is formed into a vertically long bag shape by sewing the outer periphery of two base fabrics arranged in the seat width direction. As shown in FIG. 7A, the lower chamber 82B constituting the lower part of the bag body 82 is formed in an approximately C-shape with a slit portion arranged toward the upper side of the seat when viewed from the seat width direction. In other words, the lower chamber 82B is separated into a front part 82B1 and a rear part 82B2 in the seat front-rear direction by a slit 84 extending downward from the upper end of the lower chamber 82B. Also, as shown in FIG. 7B, the lower chamber 82B is overlapped with the rear part 82B2 in the seat width direction by sliding the front part 82B1 toward the rear side of the seat. In this embodiment, the tip part of the front part 82B1 of the lower chamber 82B overlaps with the rear part 82B2 on the outside in the seat width direction. The upper end of the front part 82B1 of the lower chamber 82B and the rear end of the rear part 82B2 are sewn and joined at the sewing part S6. As shown in FIG. 7B, the base fabric at the boundary between the front portion 82B1 and the rear portion 82B2 of the lower chamber 82B is folded back in a fan shape to form a folded portion 86. As a result, the gas generated by the inflator 42 first completes the inflation and deployment of the rear portion 82B2 of the lower chamber 82B, and then the folded portion 86 is released to complete the inflation and deployment of the front portion of the lower chamber 82B. In this state, the front portion 82B1 and the rear portion 82B2 of the lower chamber 82B are positioned to overlap the waist L of the occupant P when viewed from the seat width direction.

The vehicle side airbag device 80 according to the third modified example described above basically follows the configuration of the vehicle side airbag device 10 according to the above embodiment, and therefore can achieve the same effects. That is, during a side collision, the lumbar region L of the occupant P can be restrained early with a high restraining force, while a restraining stroke in the seat width direction can be obtained.

(Fourth Modification)
8, the bag body 92 may have a slit 94 extending upward from the lower end of the upper chamber 92A in order to separate the upper chamber 92A into a front portion 92A1 and a rear portion 92A2 in the seat front-rear direction. In this case, the upper chamber 92A is slid toward the rear of the seat, and the lower end of the front portion 92A1 is sewn to the rear end of the rear portion 92A2.

The configuration of the fourth modified example described above is the same as that of the third modified example, but with the lower chamber 82B applied to the upper chamber 92A. The configuration of the fourth modified example basically follows the configuration of the second modified example described above. Therefore, like the second modified example, it is possible to obtain a restraining stroke in the seat width direction while restraining the head H of the occupant P early with a high restraining force during a side collision.

(Fifth Modification)
9, the bag body 102 may have a slit 104 formed in the upper chamber 102A, which extends upward from the lower end of the upper chamber 102A. Also, the lower chamber 102B may have a slit 104 formed in the lower chamber 102B, which extends downward from the upper end of the lower chamber 102B.

As described in the third and fourth modifications above, the configuration of the fifth modification makes it possible to quickly restrain the head H and waist L of the occupant P with a high restraining force during a side collision while obtaining a restraining stroke in the seat width direction.

The above describes the side airbag devices 10, 60, 70, 80, 90, and 100 according to the embodiments and modifications, but it goes without saying that the present invention can be embodied in various forms without departing from the gist of the present invention. For example, in the bag body according to the above embodiment, the front part of the chamber separated in the front-rear direction of the seat by a slit is slid and positioned inside the rear part in the seat width direction, but the front part of the chamber may be positioned outside the rear part in the seat width direction.

In addition, in each of the above modified examples, the front part of the chamber, which is separated in the front-rear direction of the seat by a slit, is slid and positioned outside the rear part in the seat width direction in the bag body, but the front part of the chamber may be positioned inside the rear part in the seat width direction.

In the above embodiment, the first modified example, and the second modified example, the upper ends or lower ends of the front and rear parts of the chamber separated in the front-to-rear direction of the seat by a slit are sewn together at the stitching portion, but the position where the front and rear parts of the chamber are joined can be changed as appropriate. For example, the front ends or rear ends of the front and rear parts may be joined together.

REFERENCE SIGNS LIST 10 Vehicle side airbag device 14 Vehicle seat 12 Bag body 12A Upper chamber 12B Lower chamber 12B1 Front part of lower chamber 12B2 Rear part of lower chamber 30 Slit 42 Inflator 60 Vehicle side airbag device 62 Bag body 62A Upper chamber 62A1 Front part of upper chamber 62A2 Rear part of upper chamber 62B Lower chamber 64 Slit 70 Vehicle side airbag device 72 Bag body 72A Upper chamber 72A1 Front part of upper chamber 72A2 Rear part of upper chamber 72B Lower chamber 72B1 Front part of lower chamber 72B2 Rear part of lower chamber 74 Slit 80 Vehicle side airbag device 82 Bag body 82A Upper chamber 82B Lower chamber 82B1 Front part of lower chamber 82B2 Rear part of lower chamber 84 Slit 90 Vehicle side airbag device 92 Bag body 92A Upper chamber 92A1 Front part of upper chamber 92A2 Rear part of upper chamber 94 Slit 100 Vehicle side airbag device 102 Bag body 102A Upper chamber 102B Lower chamber 104 Slit

Claims (1)

The bag body is stored inside a vehicle seat, and is inflated and deployed at the side of an occupant by receiving gas from an inflator when a side collision is predicted or detected, and has an upper chamber that covers the side of the occupant's head and a lower chamber that covers the side of the occupant's waist when inflated and deployed,
A slit is formed in the bag body to separate at least one of the upper chamber and the lower chamber from the front and rear in the seat front-rear direction, and the front and rear parts of the chambers separated by the slit are sewn together in such a manner that at least a part of the chambers are overlapped in the seat width direction.
A side airbag device for a vehicle.