Side airbag, side airbag device, and method for manufacturing side airbag

Abstract

To provide a side airbag that exhibits excellent shape retention at corners during inflation and expansion, allows easy sewing, and can improve manufacturability.SOLUTION: Main panels 10, 20, a top panel 50, a bottom panel 60, a front panel 30, a rear panel 40, an upper connection panel 1, and a lower connection panel 2 which constitute a side airbag S are formed integrally in a series. The upper connection panel 1 is folded to the inner side of the side airbag such that a rear edge 54 of the top panel 50 and an upper edge 41 of the rear panel 40 are brought into contact with each other, and the rear edge 54 and the upper edge 41 are joined together. The lower connection panel 2 is folded to the inner side of the side airbag such that a rear edge 64 of the bottom panel 60 and a lower edge 43 of the rear panel 40 are brought into contact with each other, and the rear edge 64 and the lower edge 43 are joined together.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a side airbag that expands and deploys to the side of a vehicle occupant, a side airbag device, and a method for manufacturing a side airbag.

Background Art

[0002] As a side airbag that expands and deploys to the side of an occupant during a side collision of a vehicle such as an automobile, Patent Document 1 describes a two-chamber 3D side airbag including a pair of main panels, a belt-shaped side panel that is sewn to the outer peripheral edge portions of the pair of main panels to form an airbag bag body together with the pair of main panels, and a tether that is sewn to the pair of main panels to partition the inside of the airbag bag body vertically. Such a conventional side airbag has a complicated sewing operation, which has hindered mass production.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a side airbag, a side airbag device, and a method for manufacturing a side airbag, which have good shape retention at the corners during inflation and deployment, are easy to sew, and can improve productivity.

Means for Solving the Problems

[0005] The side airbag of the present invention is a side airbag that inflates and deploys on the side of an occupant, and includes a first main panel and a second main panel arranged opposite to each other, an upper surface panel located between the upper sides of the first main panel and the second main panel, a lower surface panel located between the lower sides of the first main panel and the second main panel, a front panel located between the front sides of the first main panel and the second main panel and continuous with the first main panel, a rear panel located between the rear sides of the first main panel and the second main panel and continuous with the first main panel and the second main panel, an upper connecting panel continuous with the rear side of the upper surface panel and the upper side of the rear panel, and a lower connecting panel continuous with the rear side of the lower surface panel and the lower side of the rear panel. The upper connecting panel is folded inside the side airbag so that the rear side of the upper surface panel and the upper side of the rear panel are in contact with each other, and the rear side of the upper surface panel and the upper side of the rear panel are joined. The lower connecting panel is folded inside the side airbag so that the rear side of the lower surface panel and the lower side of the rear panel are in contact with each other, and the rear side of the lower surface panel and the lower side of the rear panel are joined. The first main panel, the second main panel, the upper surface panel, the lower surface panel, the front panel, the rear panel, the upper connecting panel, and the lower connecting panel are integrally formed as a single unit.

[0006] In one aspect of the present invention, the upper surface panel has a rectangular shape having a pair of first side edges and second side edges, a front edge connecting the front ends of the first side edge and the second side edge, and a rear edge connecting the rear ends of the first side edge and the second side edge. The upper surface panel further includes an upper connection panel continuous with the upper side of the first side edge and the first main panel. The upper connection panel is integrally formed with the upper surface panel and the first main panel. The upper connection panel is folded inside the side airbag so that the first side edge and the upper side of the first main panel are in contact with each other, and the first side edge and the upper side of the first main panel are joined.

[0007] In one aspect of the present invention, the bottom panel is square-shaped and has a pair of first and second side edges, a front edge connecting the front ends of the first and second side edges, and a rear edge connecting the rear ends of the first and second side edges. The bottom panel further includes a lower connection panel that is continuous with the first side edge and the lower side of the first main panel. The lower connection panel is configured integrally with the bottom panel and the first main panel, and is folded inside the side airbag such that the first side edge contacts the lower side of the first main panel, and the first side edge is connected to the lower side of the first main panel.

[0008] In one aspect of the present invention, the side airbag further includes a tether that divides the interior of the side airbag into a plurality of chambers vertically.

[0009] In one aspect of the present invention, the front panel has a rectangular upper panel, middle panel, and lower panel, respectively. One of the pair of side edges of the upper panel, middle panel, and lower panel is common with the front edge of the first main panel. The front panel further includes a square first intermediate connection panel that is continuous with the lower side of the upper panel and the upper side of the middle panel, and a square second intermediate connection panel that is continuous with the lower side of the middle panel and the upper side of the lower panel. The first intermediate connection panel has a line-symmetric shape with a diagonal line extending from the vertex where the lower side of the upper panel contacts the upper side of the middle panel as the axis of symmetry. The first intermediate connection panel is folded inside the side airbag such that the lower side of the upper panel contacts the upper side of the middle panel, and the lower side of the upper panel is connected to the upper side of the middle panel. The second intermediate connection panel has a line-symmetric shape with a diagonal line extending from the vertex where the lower side of the middle panel contacts the upper side of the lower panel as the axis of symmetry. The second intermediate connection panel is folded inside the side airbag such that the lower side of the middle panel contacts the upper side of the lower panel, and the lower side of the middle panel is connected to the upper side of the lower panel. The upper panel, middle panel, lower panel, first intermediate connection panel, and second intermediate connection panel are configured integrally with the first main panel.

[0010] The side airbag device of the present invention includes a side airbag of the present invention and an inflator for inflating the side airbag.

[0011] The method for manufacturing the side airbag of the present invention includes the steps of preparing an assembled panel in which the first main panel, the second main panel, the upper panel, the lower panel, the front panel, the rear panel, the upper connecting panel, and the lower connecting panel are integrally connected; folding the upper connecting panel so as to be inside the side airbag and sewing the rear edge of the upper panel and the upper edge of the rear panel; folding the lower connecting panel so as to be inside the side airbag and sewing the rear edge of the lower panel and the lower edge of the rear panel; sewing one of the pair of side edges of the upper panel and the upper edge of the first main panel, and sewing one of the pair of side edges of the lower panel and the lower edge of the first main panel; sewing the other of the pair of side edges of the upper panel and the upper edge of the second main panel, and sewing the other of the pair of side edges of the lower panel and the lower edge of the second main panel; sewing the front edge of the upper panel and the upper edge of the front panel, and sewing the front edge of the lower panel and the lower edge of the front panel; and sewing the front edge of the second main panel and the side edge of the front panel.

Advantages of the Invention

[0012] According to the present invention, the shape retention at the corners during the inflation and deployment of the side airbag is good, sewing is easy, and the manufacturability can be improved.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying out the Invention

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the front-rear, up-down, and left-right directions are the same as the front-rear, up-down, and left-right directions of the vehicle unless otherwise specified. In the drawings, FR and UP indicate the front direction and the upward direction of the vehicle, respectively.

[0015] Figs. 1 to 3 schematically show the inflated state of a side airbag S according to an embodiment of the present invention. Fig. 1 is a perspective view seen from the upper rear side, Fig. 2 is a perspective view seen from the lower front side, and Fig. 3 is a longitudinal sectional view along the front-rear direction.

[0016] The side airbag device according to this embodiment is mounted on the side member of the vehicle body such as a door of a vehicle seat. For example, when the seat is the left seat of an automobile, the airbag device is mounted on the left side of the seat.

[0017] The seat includes a seat cushion, a seat back, and a headrest. The seat back has a seat back frame as its skeleton. In this embodiment, the airbag device is attached to the seat back frame.

[0018] The airbag device includes a side airbag S folded and stored in the seat back, and an inflater that supplies inflation gas to the side airbag S.

[0019] The side airbag S is a bag body having six panels, namely, a pair of substantially rectangular main panels 10 and 20 arranged opposite to each other in the vehicle width direction, a front panel 30 continuous with the front edges of the main panels 10 and 20, a rear panel 40 continuous with the rear edges of the main panels 10 and 20, an upper panel 50 continuous with the upper edges of the main panels 10 and 20, and a lower panel 60 continuous with the lower edges of the main panels 10 and 20.

[0020] Inside the side airbag S, it is divided by a first tether 70 and a second tether 80 into an upper chamber C1, a lower chamber C3, and an intermediate chamber C2 therebetween.

[0021] The upper chamber C1 and the intermediate chamber C2 are separated by the first tether 70. The first tether 70 is provided with an opening 77 that communicates the upper chamber C1 and the intermediate chamber C2.

[0022] The lower chamber C3 and the intermediate chamber C2 are separated by the second tether 80. The second tether 80 is provided with an opening 87 that communicates the lower chamber C3 and the intermediate chamber C2.

[0023] The first tether 70 extends so as to be higher toward the front side. The second tether 80 extends so as to be lower toward the front side.

[0024] The upper chamber C1 expands and deploys to the side of the occupant's shoulder, and the lower chamber C3 expands and deploys to the side of the occupant's waist. The intermediate chamber C2 expands and deploys to the sides of the occupant's chest and abdomen.

[0025] An inflator (not shown) is installed at the rear end inside the side airbag S. For example, the inflator is cylindrical, has its longitudinal direction in the vertical direction, and is arranged such that the gas ejection holes are located inside the intermediate chamber C2.

[0026] At the front of the side airbag S, a vent hole V for allowing gas to flow out from the intermediate chamber C2 is provided. In this embodiment, two vent holes V are arranged at intervals in the vertical direction.

[0027] Next, the panel constituting the side airbag S will be described with reference to FIG. 4.

[0028] The side airbag S has an assembly panel P, tethers 70 and 80. The assembly panel P forms the outer surface of the side airbag S and has main panels 10, 20, a front panel 30, a rear panel 40, an upper panel 50, a lower panel 60, an upper connecting panel 1, a lower connecting panel 2, an upper connection panel 3, a lower connection panel 4, and intermediate connection panels 5 and 6, and these panels are integrally connected in series.

[0029] The rear panel 40 is a rectangular panel with a longitudinal direction in the vertical direction, surrounded by an upper side 41, side edges 42, a lower side 43, and side edge 44.

[0030] The main panel 10 (second main panel) is approximately rectangular (hexagonal) surrounded by an upper side 11, front sides 12 to 14, a lower side 15, and a rear side 16, and shares the rear side 16 with the side edge 44 of the rear panel 40. In other words, the main panel 10 is continuous with the rear panel 40 at the trailing edge.

[0031] The main panel 20 (first main panel) is approximately rectangular (hexagonal) surrounded by an upper side 21, front sides 22 to 24, a lower side 25, and a rear side 26, and shares the rear side 26 with the side edge 42 of the rear panel 40. In other words, the main panel 20 is continuous with the rear panel 40 at the trailing edge.

[0032] In the main panel 20, a bolt insertion hole 27 and a slit 28 are formed in the vicinity of the rear side 26.

[0033] The upper panel 50 is a substantially trapezoidal shape having a pair of side edges 51, 53, a front side 52 connecting the front ends of the side edges 51, 53, and a rear side 54 connecting the rear ends of the side edges 51, 53, and the interval between the side edges 51 and 53 is narrower on the front side 52 side. The length of the side edge 51 is approximately the same as the length of the upper side 11 of the main panel 10.

[0034] The lower panel 60 has a substantially trapezoidal shape with a pair of side edges 61, 63, a front edge 62 connecting the front ends of the side edges 61, 63, and a rear edge 64 connecting the rear ends of the side edges 61, 63. The distance between the side edge 61 and the side edge 63 is narrower on the side of the front edge 62. The length of the side edge 61 is approximately the same as the length of the lower side 15 of the main panel 10. The lower panel 60 is slightly larger than the upper panel 50.

[0035] The upper connecting panel 1 is a square panel having four sides 1a to 1d. One end of the side 1b is continuous with one end of the side 1a, and one end of the side 1d is continuous with the other end of the side 1a. One end of the side 1b is continuous with one end of the side 1c, and one end of the side 1d is continuous with the other end of the side 1c. The side 1a of the upper connecting panel 1 and the side 51 of the upper panel 50 are continuously aligned in a straight line. The side 1d of the upper connecting panel and the upper side 11 of the main panel 10 form a right angle.

[0036] The upper connecting panel 1 shares the side 1b with the rear edge 54 of the upper panel 50. Also, the upper connecting panel 1 shares the side 1c with the upper side 41 of the rear panel 40. That is, the upper edge portion of the rear panel 40 and the rear edge portion of the upper panel 50 are connected via the upper connecting panel 1.

[0037] The lower connecting panel 2 is a square panel having four sides 2a to 2d. One end of the side 2b is continuous with one end of the side 2a, and one end of the side 2d is continuous with the other end of the side 2a. One end of the side 2b is continuous with one end of the side 2c, and one end of the side 2d is continuous with the other end of the side 2c. The side 2a of the lower connecting panel 2 and the side 61 of the lower panel 60 are continuously aligned in a straight line. The side 2d of the lower connecting panel and the lower side 15 of the main panel 10 form a right angle.

[0038] The lower connecting panel 2 shares the side 2b with the rear edge 64 of the lower panel 60. Also, the lower connecting panel 2 shares the side 2c with the lower side 43 of the rear panel 40. That is, the lower edge portion of the rear panel 40 and the rear edge portion of the lower panel 60 are connected via the lower connecting panel 2.

[0039] The upper connection panel 3 connects the upper surface panel 50 and the main panel 20. The upper connection panel 3 is quadrilateral and has a line-symmetric shape with the diagonal line 3f extending from the vertex where the side 53 of the upper surface panel 50 and the upper side 21 of the main panel 20 contact as the axis of symmetry.

[0040] The lower connection panel 4 connects the lower surface panel 60 and the main panel 20. The lower connection panel 4 is quadrilateral and has a line-symmetric shape with the diagonal line 4f extending from the vertex where the side 63 of the lower surface panel 60 and the lower side 25 of the main panel 20 contact as the axis of symmetry.

[0041] The front panel 30 has an upper panel 30A, a middle panel 30B, and a lower panel 30C.

[0042] The upper panel 30A is rectangular, includes an upper side 31, side 32, and lower side 36, and shares the opposite side of the side 32 with the front side 22 of the main panel 20. The length of the upper side 31 is approximately the same as the length of the front side 52 of the upper surface panel 50. The length of the side 32 is approximately the same as the length of the front side 12 of the main panel 10.

[0043] The middle panel 30B is rectangular, includes an upper side 37, side 33, and lower side 38, and shares the opposite side of the side 33 with the front side 23 of the main panel 20. The length of the upper side 37 is approximately the same as the length of the lower side 36 of the upper panel 30A. The length of the side 33 is approximately the same as the length of the front side 13 of the main panel 10. Further, a vent hole V is formed in the middle panel 30B.

[0044] The lower panel 30C is rectangular, includes an upper side 39, side 34, and lower side 35, and shares the opposite side of the side 34 with the front side 24 of the main panel 20. The length of the upper side 39 is approximately the same as the length of the lower side 38 of the middle panel 30B. The length of the side 34 is approximately the same as the length of the front side 14 of the main panel 10. The length of the lower side 35 is approximately the same as the length of the front side 62 of the lower surface panel 60.

[0045] The main panel 20 is connected to the front panel 30 at the front edge portion.

[0046] The intermediate connection panel 5 connects the upper panel 30A and the middle panel 30B. The intermediate connection panel 5 is quadrilateral and has a line-symmetric shape with the diagonal line 5f extending from the vertex where the lower side 36 of the upper panel 30A and the upper side 37 of the middle panel 30B are in contact as the axis of symmetry.

[0047] The intermediate connection panel 6 connects the middle panel 30B and the lower panel 30C. The intermediate connection panel 6 is quadrilateral and has a line-symmetric shape with the diagonal line 6f extending from the vertex where the lower side 38 of the middle panel 3B and the upper side 39 of the lower panel 30C are in contact as the axis of symmetry.

[0048] The tether 70 is a panel surrounded by a front side 71, side sides 72, 73, a rear side 74, and side sides 75, 76, and an opening 77 is formed. The front side 71 and the rear side 74 face each other. Also, the front side 71 and the rear side 74 are parallel. The side sides 73, 75 are curved in an arc shape and are concave toward the inside of the panel.

[0049] The front side 71 connects the ends of the side sides 72, 76. The side side 73 connects the other end of the side side 72 and one end of the rear side 74. The side side 75 connects the other end of the side side 76 and the other end of the rear side 74.

[0050] The distance between the side sides 72 and 76 (the width of the tether 70) becomes narrower toward the front side 71.

[0051] The tether 80 is a panel surrounded by a front side 81, side sides 82, 83, a rear side 84, and side sides 85, 86, and an opening 87 is formed. The front side 81 and the rear side 84 face each other. Also, the front side 81 and the rear side 85 are parallel. The side sides 83, 85 are curved in an arc shape and are concave toward the inside of the panel.

[0052] The front side 81 connects the ends of the side sides 82, 86. The side side 83 connects the other end of the side side 82 and one end of the rear side 84. The side side 85 connects the other end of the side side 86 and the other end of the rear side 84.

[0053] The distance between the side 82 and the side 86 (the width of the tether 80) becomes narrower toward the front side 81.

[0054] In the manufacture of the side airbag S, first, the rear sides 74 and 84 of the tethers 70 and 80 are joined to the positions 474 and 484 (see FIG. 5) of the rear panel 40 of the assembly panel P. The joining method is not limited, but for example, it is sewn with a sewing thread. Next, the side sides 72 and 82 of the tethers 70 and 80 are joined to the positions 172 and 182 of the main panel 10 of the assembly panel P, and the side sides 76 and 86 are joined to the positions 276 and 286 of the main panel 20.

[0055] Next, the upper connecting panel 1 is folded inward along the diagonal line 1f so that the upper side 41 of the rear panel 40 and the rear side 54 of the upper panel 50 are in contact with each other, and the upper side 41 and the rear side 54 are joined. Similarly, the lower connecting panel 2 is folded inward along the diagonal line 2f so that the lower side 43 of the rear panel 40 and the rear side 64 of the lower panel 60 are in contact with each other, and the lower side 43 and the rear side 64 are joined. Thereby, the rear panel 40, the upper panel 50, and the lower panel 60 are joined.

[0056] The upper connection panel 3 is folded inward along the diagonal line 3f so that the upper side 21 of the main panel 20 and the side 53 of the upper panel 50 are in contact with each other, and the upper side 21 and the side 53 are joined. Similarly, the lower connection panel 4 is folded inward along the diagonal line 4f so that the lower side 25 of the main panel 20 and the side 63 of the lower panel 60 are in contact with each other, and the lower side 25 and the side 63 are joined. Thereby, the main panel 20, the upper panel 50, and the lower panel 60 are joined.

[0057] The intermediate connection panel 5 is folded inward along the diagonal line 5f to join the lower side 36 of the upper panel 30A and the upper side 37 of the middle panel 30B. The intermediate connection panel 6 is folded inward along the diagonal line 6f to join the lower side 38 of the middle panel 30B and the upper side 39 of the lower panel 30C. Thereby, the upper panel 30A, the middle panel 30B, and the lower panel 30C are joined, and the front panel 30 is formed.

[0058] Next, the upper side 11 of the main panel 10 is coupled to the side 51 of the upper surface panel 50. The lower side 15 of the main panel 10 is coupled to the side 61 of the lower surface panel 60. Thereby, the main panel 10, the upper surface panel 50, and the lower surface panel 60 are coupled together.

[0059] Next, the upper side 31 of the front panel 30 (upper panel 30A) is coupled to the front side 52 of the upper surface panel 50. The lower side 35 of the front panel 30 (lower panel 30C) is coupled to the front side 62 of the lower surface panel 60. Thereby, the front panel 30, the upper surface panel 50, and the lower surface panel 60 are coupled together.

[0060] Next, the front sides 12 to 14 of the main panel 10 and the sides 32 to 34 of the front panel 30 are coupled respectively. Thereby, the main panel 10 and the front panel 30 are coupled together, and the bag-shaped side airbag S is obtained. In this embodiment, the side airbag S can be easily manufactured only by flat sewing.

[0061] Thereafter, an inflator (not shown) is inserted into the side airbag S through the slit 28 of the main panel 20. The regions between the curved sides 75, 85 of the tethers 70, 80 and the main panel 20 become inflator placement regions. Two stud bolts are provided on the inflator, and the stud bolts are passed through the bolt insertion holes 27. The side airbag S is fixed to the seat back frame by the stud bolts protruding from the side airbag S through the bolt insertion holes 27.

[0062] When a vehicle equipped with an airbag device having the side airbag S configured as described above is side-collided, the inflator generates gas. The gas ejected from the inflator inflates the intermediate chamber C2 and flows vertically from the openings 77, 87 of the tethers 70, 80 and the regions between the curved sides 73, 83 and the main panel 10 to inflate the upper chamber C1 and the lower chamber C3.

[0063] In this side airbag S, the inflated and deployed upper chamber C1 and lower chamber C3 restrain the shoulders and waist of the occupant. Also, the tethers 70, 80 regulate the vehicle-width direction thickness of the side airbag S, and the occupant restraint surface (for example, the main panel 20) is flat.

[0064] In this embodiment, in the fully inflated state of the side airbag S, the inflation thickness of the side airbag 1 is smaller toward the front side.

[0065] Since the number of panels increases due to folding of the panels at the corners of the side airbag S, the shape retention force and strength when inflated and deployed can be improved. For example, at the corner where the main panel 20, rear panel 40, and upper panel 50 intersect, there are upper connecting panels 1 and upper connection panels 3 folded along the diagonal, and the number of panels is increased.

[0066] In this embodiment, the upper connecting panel 1, lower connecting panel 2, upper connection panel 3, lower connection panel 4, intermediate connection panels 5 and 6 folded along the diagonal are arranged inside the side airbag S, so the side airbag S inflates and deploys smoothly.

[0067] In the above embodiment, the configuration using the collective panel P in which the main panels 10, 20, front panel 30, rear panel 40, upper panel 50, lower panel 60, upper connecting panel 1, lower connecting panel 2, upper connection panel 3, lower connection panel 4, intermediate connection panels 5 and 6 are integrated as a single unit has been described, but some of the panels may be separate.

[0068] In the above embodiment, the positions and numbers of the openings 77, 87 formed in the tethers 70, 80 and the vent holes V formed in the front panel 30 can be changed as appropriate.

[0069] In the above embodiment, two tethers 70, 80 are provided, but one or three or more tethers may be provided. [[ID=**26]]

[0070] In the above-described embodiment, the configuration in which the inflator is disposed near the boundary between the main panel 20 and the rear panel 40 has been described. However, the position of the inflator can be changed according to the layout.

[0071] The upper connecting panel 1 is not limited to a square, and may be a quadrilateral that is line-symmetric about the diagonal line 1f, or a right-angled isosceles triangle having a right angle formed by the sides 1b and 1c as the apex angle. The same applies to the lower connecting panel 2.

[0072] The side airbag S described above can be rotated by 90° and arranged such that the upper surface panel 50 and the lower surface panel 60 serve as side panels, and can also be used as a knee airbag having a flat restraint surface.

[0073] The above-described embodiment shows one form of the present invention, and the present invention is not limited to the above-described embodiment.

Description of Reference Numerals

[0074] 1 Upper connecting panel 2 Lower connecting panel 3 Upper connection panel 4 Lower connection panel 5, 6 Intermediate connection panel 10, 20 Main panel 30 Front panel 40 Rear panel 50 Upper surface panel 60 Lower surface panel 70, 80 Tether

Claims

1. A side airbag that inflates and deploys to the side of an occupant, a first main panel and a second main panel arranged opposite to each other, an upper panel located between the upper sides of the first main panel and the second main panel, a lower panel located between the lower sides of the first main panel and the second main panel, a front panel located between the front sides of the first main panel and the second main panel and continuous with the first main panel, a rear panel located between the rear sides of the first main panel and the second main panel and continuous with the first main panel and the second main panel, an upper connecting panel continuous with the rear side of the upper panel and the upper side of the rear panel, a lower connecting panel continuous with the rear side of the lower panel and the lower side of the rear panel, comprising: the upper connecting panel is folded inside the side airbag so that the rear side of the upper panel and the upper side of the rear panel are in contact, and the rear side of the upper panel and the upper side of the rear panel are joined, the lower connecting panel is folded inside the side airbag so that the rear side of the lower panel and the lower side of the rear panel are in contact, and the rear side of the lower panel and the lower side of the rear panel are joined, a side airbag in which the first main panel, the second main panel, the upper panel, the lower panel, the front panel, the rear panel, the upper connecting panel, and the lower connecting panel are integrally formed as a single unit.

2. The upper panel has a rectangular shape having a pair of first side edges and second side edges, a front edge connecting the front ends of the first side edge and the second side edge, and a rear edge connecting the rear ends of the first side edge and the second side edge, further comprising an upper connection panel continuous with the first side edge and the upper side of the first main panel, the upper connection panel is integrally formed as a single unit with the upper panel and the first main panel, the side airbag according to claim 1, wherein the upper connection panel is folded inside the side airbag so that the first side edge and the upper side of the first main panel are in contact, and the first side edge and the upper side of the first main panel are joined.

3. The lower panel has a rectangular shape having a pair of first side edges and second side edges, a front edge connecting the front ends of the first side edge and the second side edge, and a rear edge connecting the rear ends of the first side edge and the second side edge, Further comprising a lower connection panel connected to the first side and the lower side of the first main panel, The lower connection panel is integrally formed with the lower surface panel and the first main panel, The side airbag according to claim 1, wherein the lower connection panel is folded inside the side airbag so that the first side and the lower side of the first main panel are in contact with each other, and the first side and the lower side of the first main panel are joined.

4. The side airbag according to claim 1, further comprising a tether that divides the inside of the side airbag into a plurality of chambers vertically.

5. The front panel has a rectangular upper panel, a middle panel, and a lower panel, respectively. One of the pair of sides of the upper panel, the middle panel, and the lower panel is common to the front side of the first main panel. Further comprising a square first intermediate connection panel connected to the lower side of the upper panel and the upper side of the middle panel, and a square second intermediate connection panel connected to the lower side of the middle panel and the upper side of the lower panel. The first intermediate connection panel has a line-symmetric shape with a diagonal line extending from the vertex where the lower side of the upper panel and the upper side of the middle panel are in contact as the axis of symmetry. The first intermediate connection panel is folded inside the side airbag so that the lower side of the upper panel and the upper side of the middle panel are in contact with each other, and the lower side of the upper panel and the upper side of the middle panel are joined. The second intermediate connection panel has a line-symmetric shape with a diagonal line extending from the vertex where the lower side of the middle panel and the upper side of the lower panel are in contact as the axis of symmetry. The second intermediate connection panel is folded inside the side airbag so that the lower side of the middle panel and the upper side of the lower panel are in contact with each other, and the lower side of the middle panel and the upper side of the lower panel are joined. The side airbag according to claim 1, wherein the upper panel, the middle panel, the lower panel, the first intermediate connection panel, and the second intermediate connection panel are integrally formed with the first main panel.

6. A side airbag device having the side airbag according to any one of claims 1 to 5 and an inflator for inflating the side airbag.

7. A method for manufacturing the side airbag according to claim 1, A step of preparing an integrated panel in which the first main panel, the second main panel, the upper panel, the lower panel, the front panel, the rear panel, the upper connecting panel, and the lower connecting panel are integrally formed; A step of folding the upper connecting panel to be inside the side airbag and sewing the rear edge of the upper panel and the upper edge of the rear panel; A step of folding the lower connecting panel to be inside the side airbag and sewing the rear edge of the lower panel and the lower edge of the rear panel; A step of sewing one of the pair of side edges of the upper panel and the upper edge of the first main panel, and sewing one of the pair of side edges of the lower panel and the lower edge of the first main panel; A step of sewing the other of the pair of side edges of the upper panel and the upper edge of the second main panel, and sewing the other of the pair of side edges of the lower panel and the lower edge of the second main panel; A step of sewing the front edge of the upper panel and the upper edge of the front panel, and sewing the front edge of the lower panel and the lower edge of the front panel; A step of sewing the front edge of the second main panel and the side edge of the front panel; A method for manufacturing a side airbag comprising the above steps.

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