Side airbag device for vehicle

Abstract

To provide a vehicular side airbag device that can obtain a restraining stroke in a seat width direction while early restraining the head or the waist of an occupant with high restraining force at the time of side collision.SOLUTION: A vehicular side airbag device 10 comprises a bag main body 12, which is stored inside a vehicular seat 14, and receives supply of gas from an inflator 42 to be inflated and expanded beside an occupant P when a side collision is predicted or detected. The bag main body 12 comprises: an upper chamber 12A that covers a side of a head H of the occupant in an inflated and expanded state; and a lower chamber 12B that covers a side of a waist L of the occupant. Further, a slit 30 that separates the lower chamber 12B frontward and backward in a longitudinal direction of the seat is formed in the bag main body 12, where a front part 12B1 and a back part 12B2 of the separated lower chamber 12B are slid and at least portions thereof are sewn overlappingly in a width direction of the seat.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a side airbag device for a vehicle. [Background technology]

[0002] 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 includes a head protection inflation section that restrains the occupant's head, a lumbar protection inflation section that restrains the occupant's lumbar region, and an intermediate inflation section that connects the head protection inflation section and the lumbar protection inflation section. In Patent Document 1, an inner tube (duct member) is disposed inside the intermediate inflation section, and this inner tube distributes gas generated by the inflator to the head protection inflation section and the lumbar protection inflation section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-105107 A Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of protecting an occupant in a side collision, it is desirable to restrain the head, waist, and other areas of the occupant with a high restraining force early on, while ensuring a sufficient restraining stroke in the seat width direction. In order to restrain the head and waist with a high restraining force early on, it is necessary to increase the internal pressure of the side airbag and improve the deployment speed. In addition, 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.

[0005] 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 and deployment speed. Therefore, the above-mentioned prior art has room for improvement in terms of obtaining a restraining stroke in the seat width direction while restraining the head or waist of the occupant early with a high restraining force.

[0006] In consideration of the above, the present invention has an object 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. [Means for solving the problem]

[0007] The vehicle side airbag device according to the present invention described in claim 1 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 a bag body including an upper chamber which covers the side of the occupant's head and a lower chamber which covers the side of the occupant's waist in an 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 from the front and rear in the front-rear direction of the seat, The slit The front and rear parts of the separated chambers are overlapped at least partially in the sheet width direction. Being Sewing Be is.

[0008] In the vehicle side airbag device according to the present invention described in claim 1, a bag body is stored inside a vehicle seat, and this bag body is inflated and deployed to the side of an occupant by receiving gas from an inflator when a side collision is predicted or detected. The bag body also includes an upper chamber and a lower chamber, In the expanded state The upper chamber covers the sides of the occupant's head, and the lower chamber covers the sides of the occupant's hips, thereby protecting the occupant in the event of a side collision.

[0009] The bag body is formed with a slit that separates at least one of the upper chamber and the lower chamber into the front and rear in the seat front-rear direction. The bag body is configured such that the front and rear parts of the chambers separated by the slit are slid, The front and rear of the chamber At least a portion of the sheet is overlapped in the width direction. Be Sewing Be This allows the thickness in the seat width direction to be secured and the restraint stroke to be obtained by overlapping the front and rear parts of the chambers separated by the slit, without the need to increase the internal volume of the upper and lower chambers. As a result, the internal pressure of the bag body can be increased and the deployment speed can be improved, so that the restraint stroke in the seat width direction can be obtained while restraining the head or waist of the occupant early with a high restraining force in the event of a side collision. Effect of the Invention

[0010] As described above, the vehicle side airbag device according to the present invention has the excellent effect of being able to quickly restrain the head or waist of an occupant with high restraining force during a side collision, while obtaining a restraint stroke in the seat width direction. [Brief description of the drawings]

[0011] [Figure 1] 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; [Diagram 2] 2 is an enlarged cross-sectional view of a main part taken along line 2-2 in FIG. 1; [Diagram 3] 1A is a reduced side view showing the base fabric of the bag body of 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. [Figure 4]3(B) is an enlarged cross-sectional view of a main part taken along line 4B-4B in FIG. 3(B); and (C) is an enlarged cross-sectional view of a main part taken along line 4C-4C in FIG. 3(B). [Diagram 5] 4 is a reduced cross-sectional view of a main portion corresponding to FIG. 3, showing a vehicle side airbag device according to a first modified example of the embodiment. FIG. [Figure 6] 5 is a reduced cross-sectional view of a main portion corresponding to FIG. 3, showing a vehicle side airbag device according to a second modified example of the embodiment. FIG. [Figure 7] 7 is a reduced cross-sectional view of a main portion corresponding to FIG. 3, showing a vehicle side airbag device according to a third modified example of the embodiment. FIG. [Figure 8] 10 is a reduced cross-sectional view of a main portion corresponding to FIG. 3, showing a vehicle side airbag device according to a fourth modified example of the embodiment. FIG. [Figure 9] 10 is a reduced cross-sectional view of a main portion corresponding to FIG. 3, showing a vehicle side airbag device according to a fifth modified example of the embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a vehicle side airbag device 10 according to this embodiment will be described with reference to Fig. 1 to Fig. 4. Note that the arrows FR, UP, and RH in each drawing indicate the seat front side, seat upper side, and seat right side of a vehicle seat 14 on which the vehicle side airbag device 10 is mounted, respectively. When describing using front-rear, left-right, top-bottom directions, they indicate 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.

[0013] (Vehicle seat 14) 1 and 2, a vehicle seat 14 equipped with a vehicle side airbag device 10 of this embodiment (hereinafter also simply referred to as "side airbag device 10") includes a seat cushion 16, a seat back 18, and a headrest 20. Note that, 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.

[0014] A crash test dummy P is seated in the vehicle seat 14 shown in Fig. 1 and Fig. 2 in place of an actual occupant. The dummy P is, for example, the AM50 (50th percentile of adult American males) of the World Side Impact Dummy (WorldSID). In the following description, the dummy is referred to as "occupant P."

[0015] The seat cushion 16 extends in the front-rear direction and the width direction 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 a rear end of the seat cushion 16, 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.

[0016] Although not shown, the occupant P is restrained in the vehicle seat 14 by a seat belt device. The seat belt device is configured to include a belt-shaped webbing that restrains the occupant's upper body and waist L. When the seat belt device is worn, the webbing includes a shoulder belt that extends diagonally from the left shoulder S of the occupant P to the right waist L, 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 upper body of the occupant P to the seat back 18 with the shoulder belt, and restrains the occupant's waist L to the seat cushion 16 with the lap belt.

[0017] (Vehicle side airbag device 10) The side airbag device 10 includes a bag body 12, an inflator 42, and a sock 44.

[0018] The bag body 12 is stored inside the seat back 18, and is inflated by being supplied with 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 surface of the seat back 18 due to the inflation pressure.

[0019] The bag body 12 includes an upper chamber 12A that is inflated and deployed on the seat width direction 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 direction 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 to each other. Details of the bag body 12 will be described later.

[0020] The inflator 42 is a cylindrical gas generating device formed in a substantially cylindrical shape, with its axial direction aligned with a side frame 54 (see FIG. 3) that constitutes the framework of the seat back 18. A gas ejection part 42A is provided at the lower end of the inflator 42, and gas is generated from the gas ejection part 42A and supplied to the bag body 12 when a side collision of the vehicle is detected or predicted.

[0021] 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, and 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.

[0022] 1 and 2, a sock 44 is provided inside the bag body 12. The sock 44 is also called a duct, an inner tube, a flow straightening cloth, or a diffuser.

[0023] The sock 44 is formed in a generally cylindrical shape with upper and lower ends open, and extends in the seat up-down direction from the upper chamber 12A to the lower chamber 12B. A bag-shaped inflator insertion portion 46 is integrally provided at the rear end of the sock 44, and the gas ejection portion 42A of the inflator 42 is connected to the inside of the sock 44 via the inflator insertion portion 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.

[0024] The sock 44 is formed by sewing two pieces of base fabric arranged in the seat width direction. Specifically, the front and rear ends of the two pieces of base fabric constituting the sock 44 are sewn together. Although not shown, the base fabric constituting the sock 44 on the inner side in the seat width direction is sewn to the bag body 12 at multiple points.

[0025] (Bag body 12) Next, the details of the bag body 12 will be described. As shown in Fig. 2 and Fig. 3, the bag body 12 is formed into a bag shape by sewing the outer peripheries of two base cloths 50, 52 arranged in the seat width direction. In Fig. 2 and Fig. 3, the sewing part where the outer peripheries of the base cloths 50, 52 are sewn is indicated by the symbol "S1".

[0026] The upper part of the bag body 12 is an upper chamber 12A that, when inflated and deployed, covers the sides of the head H of the occupant P. When viewed in the seat width direction, the upper chamber 12A is formed in a substantially C-shape with a slit disposed toward the lower side of the seat.

[0027] 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 his / her waist L. When viewed in the seat width direction, the lower chamber 12B is formed in a bag shape that is long in the seat vertical direction, and its width in the seat front-rear direction increases toward the lower side of the seat.

[0028] 3(A), 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.

[0029] As shown in Fig. 3(B), 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, a rear half 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 sewn portion S2. In this state, the front portion 12B1 and the rear portion 12B2 of the lower chamber 12B are disposed at a position overlapping the waist L of the occupant P when viewed from the seat width direction.

[0030] By sliding the front portion 12B1 of the lower chamber 12B toward the rear portion 12B2, a generally 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 back the base fabrics 50, 52 of the lower chamber 12B alternately into 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.

[0031] In the present embodiment, the bag body 12 having the above-mentioned configuration is folded and accommodated inside the seat back 18 together with the sock 44, as an example. When gas is generated by the inflator 42, the gas is first supplied to the rear part 12B2 of the lower chamber 12B from the opening at the lower end of the sock 44. The internal volume of the rear part 12B2 is set smaller than that of the front part 12B1 from the viewpoint of prioritizing the improvement of the internal pressure and the deployment speed, as described above. Therefore, the rear part 12B2 of the lower chamber 12B completes the inflation and deployment at the early stage of a side collision, and can restrain the waist part L of the occupant P with a high restraining force. Then, as the internal pressure of the lower chamber 12B increases, the folded part 32 formed in the front part 12B1 is released and gas is supplied inside the front part 12B1. At this time, the folded part 32 is released in order from the front of the seat, which has a small folding margin t, to the rear, so that the amount of gas supplied to the front part 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 inflation and deployment is completed with the front portion 12B1 and the rear portion 12B2 of the lower chamber 12B 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, the upper chamber 12A is configured such that, when gas is supplied to the upper chamber 12A, the skin of the upper end portion of the seat back 18 is broken by the inflation pressure of the upper chamber 12A, and the upper chamber 12A is inflated and deployed 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.

[0032] (Action and Effects) Next, the operation and effects of this embodiment will be described.

[0033] 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 on the side of an occupant P. The bag body 12 also includes an upper chamber 12A and a lower chamber 12B, and the side of the head H of the occupant P is covered by the upper chamber 12A, and the side of the waist L of the occupant P is covered by the lower chamber 12B. This makes it possible to protect the occupant P in the event of a side collision.

[0034] Further, the bag body 12 is formed with a slit 30 that separates the lower chamber 12B into front and rear parts 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 approximately half area 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 thickness of the bag body 12 in the seat width direction 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 increasing 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.

[0035] (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 seat front-rear direction 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.

[0036] The bag body 62 is formed into a vertically long bag shape by sewing the outer peripheries of two base fabrics arranged in the seat width direction. The upper chamber 62A has a larger dimension in the seat front-rear direction 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 seat front-rear direction 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 seat vertical direction. 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 with the rear part 62A2 in the seat width direction by sliding the front part 62A1 toward the rear side of the seat. In this embodiment, a rear approximately half region 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 and joined to each other at a sewn portion S3. In this state, the front portion 62A1 and the rear portion 62A2 of the upper chamber 62A are disposed at a position overlapping with the head H of the occupant P when viewed from the seat width direction.

[0037] 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.

[0038] (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.

[0039] The bag body 72 is formed into a long bag shape in the vertical direction by sewing the outer peripheries 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 toward the upper side of the seat. The lower chamber 72B of the bag body 72 increases in the seat front-rear direction toward the lower side of the seat.

[0040] 6(A), the upper chamber 72A and the lower chamber 72B are separated in the front-rear direction of the seat by a slit 74 extending in the up-down direction. The slit 74 formed in the upper chamber 72A extends downward along the seat back 18 from the upper end of the upper chamber 72A. 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 side of the seat and overlap the rear parts 72A2, 72B2 in the seat width direction. In this embodiment, the rear half areas 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 end parts 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 end parts 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.

[0041] 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, during a side collision, the head H and waist L of the occupant P can be restrained early with a high restraining force while obtaining a restraint stroke in the seat width direction.

[0042] (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 seat front-rear direction 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.

[0043] The bag body 82 is formed into a vertically long bag shape by sewing the outer peripheries of two base fabrics arranged in the seat width direction. As shown in FIG. 7(A), the lower chamber 82B constituting the lower part of the bag body 82 is formed into a substantially 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. 7(B), 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. 7(B), 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-back 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-back 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.

[0044] 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 can therefore achieve the same operational effects. That is, during a side collision, the waist 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.

[0045] (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.

[0046] The configuration of the fourth modified example described above is obtained by applying the configuration of the lower chamber 82B according to the third modified example 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.

[0047] (Fifth Modification) 9, a bag body 102 may have a slit 104 formed in the upper chamber 102A, the slit 104 extending upward from the lower end of the upper chamber 102A. Also, a slit 104 may be formed in the lower chamber 102B, the slit 104 extending downward from the upper end of the lower chamber 102B.

[0048] In the configuration of the fifth variant, as described in the third and fourth variants above, the head H and lumbar region L of the occupant P can be restrained early with high restraining force during a side collision, while a restraint stroke in the seat width direction can be obtained.

[0049] Although the side airbag devices 10, 60, 70, 80, 90, and 100 according to the embodiments and modifications have been described above, it is needless to say 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 seat front-rear direction by the slit is slid and positioned on the inner side in the seat width direction relative to the rear part, but the front part of the chamber may be positioned on the outer side in the seat width direction relative to the rear part.

[0050] In addition, in each of the above modified examples, the front part of the chamber separated in the fore-and-aft direction of the seat by a slit in the bag body is slid and positioned outside the rear part in the seat width direction, but the front part of the chamber may also be positioned inside the rear part in the seat width direction.

[0051] In the above embodiment, the first modification, and the second modification, the upper ends or lower ends of the front and rear parts of the chamber separated in the front-rear direction of the seat by a slit are sewn together at the sewn part, 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. [Explanation of symbols]

[0052] 10. Vehicle side airbag device 14 Vehicle seats 12 Bag body 12A Upper Chamber 12B Lower chamber 12B1 Front of lower chamber 12B2 Rear of the lower chamber 30 Slit 42 Inflator 60 Vehicle side airbag device 62 Bag body 62A Upper Chamber 62A1 Front of upper chamber 62A2 Rear of upper chamber 62B Lower Chamber 64 Slit 70 Vehicle side airbag device 72 Bag body 72A Upper Chamber 72A1 Front of upper chamber 72A2 Rear of upper chamber 72B Lower Chamber 72B1 Front of lower chamber 72B2 Rear of the lower chamber 74 Slit 80 Vehicle side airbag device 82 Bag body 82A Upper Chamber 82B Lower Chamber 82B1 Front of lower chamber 82B2 Rear of the lower chamber 84 Slit 90 Vehicle side airbag device 92 Bag body 92A Upper Chamber 92A1 Front of upper chamber 92A2 Rear of the upper chamber 94 Slit 100 Vehicle side airbag device 102 Bag body 102A Upper Chamber 102B Lower chamber 104 Slit

Claims

[Claim 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.

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