Vehicle Side Airbag Device

Abstract

[Problem] To provide a vehicular side airbag device in which the occupant restraint performance of an airbag cushion can be improved with a simple configuration. [Solution] An airbag module 106 includes a bag-like airbag cushion 108 in a predetermined storage form, which is rolled or folded, and an inflator 110 for supplying gas to the airbag cushion 108. The airbag cushion 108 includes: a main chamber 112 that inflates and deploys from a side frame 134 to the side of an occupant 136 seated in a vehicle seat 102; a sub-chamber 114 that protrudes from the main chamber 112 toward the occupant 136 and inflates and deploys; an upper tether 125 extending between the sub-chamber 114 and a portion of the main chamber 112 above the sub-chamber 114; and a lower tether 127 extending between the sub-chamber 114 and a portion of the main chamber 112 below the sub-chamber 114.

Description

Technical Field

[0001] The present invention relates to a vehicle side airbag device that restrains an occupant seated on a vehicle seat.

Background Art

[0002] In recent years, airbag devices have been almost standard equipment in vehicles. An airbag device is a safety device that operates in an emergency such as a vehicle collision, and uses an airbag cushion that inflates and deploys by gas pressure to receive and protect an occupant. There are various types of airbag devices depending on the installation location and usage. For example, the airbag 16 described in FIG. 2A of Patent Document 1 is provided inside the vehicle width direction of the seat back 14 and restrains the vicinity of the occupant's shoulder.

[0003] In the technology of Patent Document 1, an upper panel 18 and a lower panel 20 are provided respectively at the upper and lower portions of the airbag 16. These upper panel 18 and lower panel 20 are connected to a retractor 52 via a strap 54, and by the function of the retractor 52, the airbag 16 can be pulled in toward the seat back side. By these, as illustrated in FIG. 3B, the airbag 16 forms a valley portion 24 between the first portion 64 and the second portion 66, and can restrain the occupant's shoulder at the valley portion 24.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In an airbag device, reducing the amount of movement of an occupant is an important evaluation item that also leads to a reduction in the injury value of the occupant. Regarding the reduction of the amount of movement of the occupant, in addition to the conventional methods of increasing the size or increasing the pressure of the airbag cushion, it can also be achieved by restricting the movement of the airbag 16 using the upper panel 18, retractor 52, etc. as in Patent Document 1. However, the technique using the upper panel 18, retractor 52, etc. in Patent Document 1 may not be adopted in terms of the installation location and cost because there are many additional elements in the device configuration. Similarly, it is difficult to easily adopt an increase in the size or an increase in the pressure of the airbag cushion.

[0006] In view of such problems, an object of the present invention is to provide a vehicle side airbag device capable of improving the occupant restraint performance of an airbag cushion with a simple configuration.

Means for Solving the Problems

[0007] In order to solve the above problems, a typical configuration of a vehicle side airbag device according to the present invention is a vehicle side airbag device attached to a side frame of a seat back of a vehicle seat. The vehicle side airbag device includes an airbag cushion in a bag shape and in a predetermined storage form that is wound or folded, and an inflater that supplies gas to the airbag cushion. The airbag cushion has a main chamber that expands and deploys from the side frame to the side of an occupant seated on the vehicle seat, a sub-chamber that protrudes from the main chamber toward the occupant side and expands and deploys, an upper tether that spans between an upper portion of the main chamber above the sub-chamber and the sub-chamber, and a lower tether that spans between a lower portion of the main chamber below the sub-chamber and the sub-chamber. A vehicle side airbag device is characterized by having these components.

[0008] Generally, it is known that the rotational behavior of the head tends to increase the injury value. However, with the above configuration, the rotational behavior of the head can be suppressed by utilizing the sub-chamber. In particular, in addition to being widely supported by the main chamber, the above sub-chamber can be pulled by the upper tether and the lower tether to maintain its posture. Therefore, with the above configuration, when restraining the occupant, the sub-chamber can efficiently absorb energy from the occupant's head, and while achieving a simple configuration, the injury value of the occupant can be suitably reduced.

[0009] One of the above upper tether and lower tether may be longer than the other. With this configuration, it becomes possible to control the contact position and contact timing of the sub-chamber with the head, such as tilting the sub-chamber upward or downward.

[0010] The above upper tether may be longer than the lower tether. With this configuration, for example, it becomes possible to tilt the sub-chamber downward.

[0011] The above lower tether may be longer than the upper tether. With this configuration, for example, it becomes possible to tilt the sub-chamber upward.

[0012] The length of the above upper tether may be shorter than the distance from the connection part of the main chamber with the upper tether to the connection part of the sub-chamber with the upper tether when the main chamber and the sub-chamber expand and deploy with the upper tether and the lower tether omitted.

[0013] According to the above configuration, the upper tether can be efficiently tensioned when the airbag cushion expands and deploys. Thereby, it becomes possible to arbitrarily control the shape of the airbag cushion, such as tilting the sub-chamber upward.

[0014] The length of the above-mentioned lower tether may be shorter than the distance from the connection part of the main chamber with the lower tether to the connection part of the sub-chamber with the lower tether when the main chamber and the sub-chamber expand and deploy with the lower tether and the upper tether omitted.

[0015] According to the above configuration, the lower tether can be efficiently tensioned when the airbag cushion expands and deploys. As a result, it becomes possible to arbitrarily control the shape of the airbag cushion, for example, by tilting the sub-chamber downward. Furthermore, it also becomes possible to tension both the upper tether and the lower tether to curve the main chamber toward the sub-chamber side.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a vehicle side airbag device capable of improving the occupant restraint performance of an airbag cushion with a simple configuration.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0018] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in such embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to omit redundant description, and elements not directly related to the present invention are not shown.

[0019] FIG. 1 is a diagram illustrating a vehicle side airbag device (hereinafter, side airbag device 100) according to an embodiment of the present invention. FIG. 1(a) is a diagram illustrating the state of the side airbag device 100 before activation. In FIGS. 1(a) and 1(b), the side airbag device 100 and the front row left seat 102 to which the side airbag device 100 is applied are illustrated from the left side in the vehicle width direction, that is, from the outside in the vehicle width direction (outside the vehicle).

[0020] In the present embodiment, when the occupant 136 (see FIG. 5(a) etc.) is seated on the seat 102 in a regular posture, the direction the occupant 136 is facing is defined as the front, the opposite direction of the back is the rear, the right side of the occupant 136 is the right direction, and the left side of the occupant 136 is the left direction. Further, when the occupant 136 is seated in a regular posture, the direction of the occupant 136's head is the upward direction, and the direction of the occupant 136's feet is the downward direction. And in the drawings used in the following description, as necessary, the front-rear, left-right, up-down directions based on the occupant 136 in the above-described regular seating position are indicated by arrows F (Forward), B (Back), L (Left), R (Right), U (up), D (down).

[0021] As illustrated in FIG. 1(a), the airbag module 106 included in the side airbag device 100 of the present embodiment is installed inside the seat back 104 of the seat 102 on the inner side in the vehicle width direction (inside the vehicle). The airbag module 106 includes an airbag cushion 108 that restrains the occupant and an inflater 110 that supplies gas to the airbag cushion 108.

[0022] In this embodiment, as viewed from the occupant 136 (Fig. 5(a)) sitting on the seat 102 on the left side of the front row, the left side (outer side of the vehicle) in the vehicle width direction is the side closer to the collision, i.e., the so-called near side. Conversely, as viewed from the occupant on the seat 102, the right side (inner side of the vehicle) in the vehicle width direction is the side farther from the collision, i.e., the so-called far side. The airbag module 106 is installed on the far side of the seat back 104.

[0023] The airbag cushion 108 is a bag-shaped member that can be inflated with gas, and inflates and deploys in an emergency such as when a shock occurs in the vehicle to restrain the occupant 136 (see Fig. 5(a), etc.) sitting on the seat 102. Before operation, the airbag cushion 108 is in a stored state of being wound or folded, and is stored in the inner side portion of the seat back 104 in the vehicle. Since the airbag cushion 108 in the stored state is covered with a seat cover or the like on it, it is not visible from the outside.

[0024] The inflator 110 is a gas generator, and in the embodiment, a cylinder type (cylindrical) one is adopted. The inflator 110 is enclosed in a longitudinally extending direction in the vertical direction along the seat back 104 at the lower rear side of the main chamber 112, which will be described later, of the airbag cushion 108. The inflator 110 is electrically connected to the vehicle side, moves when receiving a signal resulting from the detection of a shock from the vehicle side, and supplies gas to the airbag cushion 108.

[0025] Currently popular inflators include types filled with a gas generating agent that burns to generate gas, types filled with compressed gas that supply gas without generating heat, or hybrid types that utilize both combustion gas and compressed gas. Any type of inflator can be used as the inflator 110.

[0026] The inflator 110 is provided with two stud bolts 110a and 110b spaced apart in its longitudinal direction. The stud bolts 110a and 110b penetrate through the base fabric of the airbag cushion 108 and are exposed to the outside, and are fastened and fixed to the side frame 134 (see Fig. 4(a)) of the seat back 104. By the stud bolts 110a and 110b penetrating through the airbag cushion 108 and being fastened to the seat back 104, the airbag cushion 108 is also attached to the seat back 104.

[0027] Fig. 1(b) is a diagram illustrating the state after the inflation and deployment of the airbag cushion 108 in Fig. 1(a). When the side airbag device 100 detects a far-side collision via various sensors and a predetermined electronic control unit (ECU: Electronic Control Unit), it moves the airbag module 106 provided on the far side.

[0028] The inflator 110 ejects gas due to the activation signal sent from the above-described ECU or the like. The airbag cushion 108 uses the gas from the inflator 110 to push back the skin of the seat bag 104 and expands and deploys into the interior space.

[0029] The airbag cushion 108 of this embodiment has a configuration including a main chamber 112 with a wide shape, a sub-chamber 114 protruding from the main chamber 112 toward the occupant side, and an upper tether 125 and a lower tether 127 for holding the posture of the sub-chamber 114.

[0030] The main chamber 112 constitutes the main part of the airbag cushion 108 and expands and deploys into an overall flat shape. The outer surface of the main chamber 112 is composed of a main panel 112a located on the left side in the vehicle width direction and on the occupant side, and a main panel 112b located on the right side in the vehicle width direction and on the side opposite to the occupant. The main panels 112a and 112b are made from a base fabric and are integrally formed into a bag shape by sewing, adhesion, etc. Note that the main chamber 112 can also be formed by textile such as using OPW (One-Piece Woven).

[0031] The sub-chamber 114 protrudes and expands toward the occupant side from a slightly front side of the upper part of the main chamber 112 on the occupant side. The sub-chamber 114 in this embodiment mainly functions to restrain the head 140 of the occupant 136 (see Fig. 5(a)).

[0032] The upper tether 125 and the lower tether 127 are belt-like members for supporting the posture of the sub-chamber 114. The upper tether 125 is stretched between the front side of the sub-chamber 114 and the upper part of the front side of the main chamber 112. The lower tether 127 is stretched between the front side of the sub-chamber 114 and the lower part of the front side of the main chamber 112. These upper tether 125 and lower tether 127 can be formed of the same material as the main panel 112a, etc.

[0033] Fig. 2 is a diagram illustrating the airbag cushion 108 in Fig. 1(b) from various directions. Fig. 2(a) is a diagram illustrating the airbag cushion 108 in Fig. 1(b) from the inside in the vehicle width direction. The main chamber 112 has an inflater 110 built in at the lower rear side, and directly receives gas from the inflater 110 and expands and deploys.

[0034] Fig. 2(b) is a cross-sectional view taken along the line A-A of the airbag cushion 108 in Fig. 1(b). The sub-chamber 114 is connected to the main panel 112a on the occupant side of the main chamber 112, and protrudes and expands toward the occupant side from the main chamber 112.

[0035] The sub-chamber 114 has a curved recess on the occupant side edge 116 towards the main chamber 112 side, forming a curved portion 118. At this time, the sub-chamber 114 has a shape in which the front end 120 protrudes towards the occupant side (the right side in Fig. 2(b)) compared to the rear end 122. Accordingly, the curved portion 118 is curved so as to gradually wrap around towards the occupant side from the rear side to the front side.

[0036] In the connection region of the sub-chamber 114 with the main chamber 112, a plurality of gas supply and receiving ports 130a to 130d are provided. The sub-chamber 114 uses the gas supply and receiving ports 130a to 130d to receive and expand the gas from the main chamber 112. That is, the gas from the inflator 110 is first supplied to the main chamber 112, and the gas is then supplied to the sub-chamber 114 through this main chamber 112. With this configuration, the main chamber 112 and the sub-chamber 114 can be suitably expanded and deployed using the gas from the inflator 110.

[0037] Fig. 3 is a schematic view illustrating the airbag module 106 in Fig. 1(b) from various directions. Fig. 3(a) is a schematic view of the airbag module 106 in Fig. 1(b) viewed from above.

[0038] The airbag module 106 is attached to the side frame 134 on the inner side in the vehicle width direction of the seat back 104 (see Fig. 1(b)). Then, the main chamber 112 expands and deploys laterally from the side frame 134 towards the occupant 136 (see Fig. 5(a)) seated on the seat 102.

[0039] Fig. 3(b) is a schematic view of the airbag module 106 in Fig. 1(b) viewed from the front. The sub-chamber 114 protrudes from the main chamber 112 towards the occupant side and expands and deploys.

[0040] Of the upper tether 125, the horizontally extending lower side 125a is connected to the front edge of the sub-chamber 114. And the vertically extending upper side 125b is connected to the edge from the upper side to the front side of the main chamber 112, including the portion above the sub-chamber 114 in the main chamber 112.

[0041] Of the lower tether 127, the horizontally extending upper side 127a is connected to the front edge of the sub-chamber 114. And the vertically extending lower side 127b is connected to the edge from the front side to the lower side of the main chamber 112, including the portion below the sub-chamber 114 in the main chamber 112.

[0042] Figure 4 is a schematic view of the airbag cushion 108 in FIG. 3(b). FIG. 4(a) illustrates the airbag cushion 108 in a state where the upper tether 125 and the lower tether 127 in FIG. 3(b) are omitted.

[0043] The first virtual plane S1 illustrated in FIG. 4(a) is a plane that extends vertically and horizontally along the main chamber 112. In a state where the upper tether 125 and the lower tether 127 are omitted, the main chamber 112 expands and unfolds vertically and horizontally along this first virtual plane S1, that is, in a behavior parallel to the first virtual plane S1.

[0044] In a state where the upper tether 125 and the lower tether 127 are omitted, the sub-chamber 114 expands and unfolds along the second virtual plane S2. This second virtual plane S2 is a plane that intersects the first virtual plane S1 and extends horizontally in a state where the upper tether 125 and the lower tether 127 are omitted.

[0045] Figure 4(b) is a diagram illustrating a state in which the upper tether 125 and the lower tether 127 of the airbag cushion 108 in Figure 4(a) are provided. The length of one of the upper tether 125 and the lower tether 127 can be set to be longer than that of the other. For example, in the present embodiment, the length of the upper tether 125 is set to be longer than that of the lower tether 127, and by weakening the tension of the upper tether 125, the sub-chamber 114 is pulled downward by the lower tether 127, causing the sub-chamber 114 to tilt downward.

[0046] The length of the lower tether 127 is set to be shorter than the distance L1 in Figure 4(a). Specifically, the distance L1 illustrated in Figure 4(a) is the distance from the connection portion P1 of the sub-chamber 114 with the lower tether 127 to the connection portion P2 of the main chamber 112 with the lower tether 127 when the main chamber 112 and the sub-chamber 114 in a state where the upper tether 125 and the lower tether 127 are omitted are inflated and deployed. The lower tether 127 in Figure 4(b) can pull the sub-chamber 114 downward because it is shorter than the distance L1.

[0047] On the other hand, the length of the upper tether 125 is set to be longer than the distance L2 in Figure 4(a). The distance L2 in Figure 4(a) is the distance from the connection portion P1 of the sub-chamber 114 with the upper tether 125 to the connection portion P3 of the main chamber 112 with the upper tether 125 when the main chamber 112 and the sub-chamber 114 in a state where the upper tether 125 and the lower tether 127 are omitted are inflated and deployed. The upper tether 125 in Figure 4(b) avoids pulling the sub-chamber 114 excessively because it is longer than the distance L2.

[0048] With the above configuration, it is possible to efficiently tension the lower tether 127 when the airbag cushion 108 is inflated and deployed. As a result, it is possible to arbitrarily control the shape of the airbag cushion 108, such as tilting the sub-chamber 114 downward.

[0049] FIG. 5 is a diagram illustrating the side airbag device 100 and the occupant 136 in FIG. 1(b). FIG. 5(a) illustrates the side airbag device 100 as viewed from the front of the seat 102. The occupant 136 in FIG. 5(a) illustrates a test dummy AM50 that simulates a physique (height 175 cm, weight 78 kg) conforming to 50% of an average adult male in the United States.

[0050] As described above, the main chamber 112 expands and deploys to the side of the occupant 136. And the sub-chamber 114 is provided on the occupant side of the main chamber 112 at a position where the lower region 126b is at or above the height of the shoulder 138 of the occupant 136 when inflated and deployed. With this configuration, the sub-chamber 114 can restrain the head 140 of the occupant 136.

[0051] The upper tether 125 and the lower tether 127 can pull the sub-chamber 114 toward the main chamber 112 side and stabilize the posture of the sub-chamber 114. In particular, the lower tether 127 can pull the front side of the sub-chamber 114 obliquely downward toward the main chamber 112 side, and can hold the posture of the sub-chamber 114 tilted downward. Also, the lower tether 127 can restrain the shoulder 138 and the arm of the occupant 136 from the front.

[0052] According to the upper tether 125 and the lower tether 127 described above, the restraint performance of the occupant by the sub-chamber 114 can be improved, such as controlling the contact position and contact timing of the sub-chamber 114 with the head 140, or tilting the sub-chamber 114 downward to restrain the shoulder 138.

[0053] FIG. 5(b) illustrates the side airbag device 100 as viewed from above the seat 102. The sub-chamber 114 can contact the head 140 of the occupant 136 from the side to the front using the curved portion 118. The head 140 of the occupant 136 is restrained by the curved portion 118 of the sub-chamber 114, preventing forward movement to the far side and also suppressing rotation about the neck.

[0054] Generally, it is known that the rotational behavior of the head 140 tends to increase the injury value of the occupant 136. In this regard, in this embodiment, the sub-chamber 114 can be used to suppress the rotational behavior of the head. In particular, in addition to being widely supported by the main chamber 112, the above-mentioned sub-chamber 114 can be pulled by the upper tether 125 and the lower tether 127 to maintain its posture. Therefore, in this embodiment, when restraining the occupant, the sub-chamber 114 can efficiently absorb energy from the head 140 of the occupant 136, and can preferably reduce the injury value of the occupant 136 while achieving a simple configuration.

[0055] In addition, in this embodiment, as illustrated in FIG. 4(a), the airbag module 106 is assembled outside the side frame 134, but the airbag module 106 can also be assembled inside the side frame 134. With this configuration, it is also possible to preferably restrain the occupant 136 (see FIG. 5(a)) using the airbag cushion 108.

[0056] Also, in this embodiment, the description has been made assuming that the airbag cushion 108 is provided on the far side of the seat back 104. By providing the airbag cushion 108 on the far side of the seat back 104, it is possible to preferably restrain the occupant 136 who tries to move to the far side during a collision. However, of course, the airbag cushion 108 may be provided on the near side of the seat back 104, and in that case as well, it is possible to preferably restrain the occupant 136 (see FIG. 5(a)) using the main chamber 112 and the sub-chamber 114.

[0057] (Modification example) FIG. 6 is a diagram illustrating each modification example of the airbag cushion 108 in FIG. 4. In FIG. 6, the same components as those already described are denoted by the same reference numerals, and thus the description of the existing components is omitted. Further, in the following description, for components having the same name as those already described, even if they are denoted by different reference numerals, they are assumed to have the same function unless otherwise specified.

[0058] FIG. 6(a) shows a first modification example (airbag cushion 200) of the airbag cushion 108 in FIG. 4. In this embodiment, the length of the lower tether 204 is set to be longer than that of the upper tether 202. As a result, in the airbag cushion 200, by weakening the tension of the lower tether 204, the upper tether 202 pulls the sub-chamber 114 upward, causing the sub-chamber 114 to tilt upward.

[0059] The length of the upper tether 202 is set shorter than the distance L2 in FIG. 4(a). On the other hand, the length of the lower tether 204 is set longer than the distance L1 in FIG. 4(a).

[0060] With the above configuration, when the airbag cushion 200 expands and deploys, the upper tether 202 can be efficiently tensioned. As a result, the shape of the airbag cushion 108, such as tilting the sub-chamber 114 upward, can be arbitrarily controlled.

[0061] FIG. 6(b) shows a second modification example (airbag cushion 220) of the airbag cushion 108 in FIG. 4. In the airbag cushion 220, the above-described upper tether 202 and lower tether 127 are adopted. With this configuration, when the airbag cushion 220 expands and deploys, both the upper tether 202 and the lower tether 127 can be tensioned to bend the main chamber 112 toward the sub-chamber 114 side.

[0062] FIG. 6(c) shows a third modification (airbag cushion 240) of the airbag cushion 108 in FIG. 4. In the airbag cushion 240, by tensioning both the upper tether 202 and the lower tether 204, the main chamber 242 can be deformed so as to curve forward. According to the airbag cushion 240, the range centered on the sub-chamber 114 in the main chamber 242 is less likely to expand, and it becomes possible to improve the load absorption performance from the occupant 136 (see FIG. 5(a)).

[0063] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can also be implemented or carried out in various ways. In particular, unless there is a description limiting the gist in the present specification, the present invention is not limited to the detailed shapes, sizes, and configurations of the components shown in the accompanying drawings. Also, the expressions and terms used in the present specification are for the purpose of explanation, and unless there is a description limiting the gist, they are not limited thereto.

[0064] Therefore, it is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope described in the claims, and it is naturally understood that they also belong to the technical scope of the present invention.

Industrial Applicability

[0065] The present invention can be used for an occupant restraint device that restrains an occupant sitting on a vehicle seat.

Explanation of Reference Numerals

[0066] 100…Side airbag device, 102…Seat, 104…Seat back, 106…Airbag module, 108…Airbag cushion, 110…Inflator, 110a, 110b…Stud bolts, 112…Main chamber, 112a, 112b…Main panel, 114…Sub-chamber, 116…Edge, 118…Curved portion, 120…End, 122…End, 125…Upper tether, 125a…Lower side, 125b…Upper side, 126a, 126b…Lower region, 127…Lower tether, 127a…Upper side, 127b…Lower side, 130a, 130b, 130c, 130d…Gas supply and receiving ports, 134…Side frame, 136…Occupant, 138…Shoulder, 140…Head, L1, L2…Distances, P1, P2…Connection parts, S1, S2…Planes, 200…Airbag cushion, 202…Upper tether, 204…Lower tether, 220…Airbag cushion, 240…Airbag cushion, 242…Main chamber

Claims

1. A vehicle side airbag device attached to a side frame of a seat back of a vehicle seat, The vehicle side airbag device includes: An airbag cushion in a bag shape and in a predetermined storage form that is wound or folded, An inflater that supplies gas to the airbag cushion, and includes: The airbag cushion includes: A main chamber that expands and deploys from the side frame to the side of an occupant seated on the vehicle seat, A sub-chamber that protrudes and expands from the main chamber toward the occupant side, An upper tether that spans between an upper portion of the main chamber above the sub-chamber and the sub-chamber, A lower tether that spans between a lower portion of the main chamber below the sub-chamber and the sub-chamber, and is characterized by having the above. A vehicle side airbag device.

2. The vehicle side airbag device according to claim 1, wherein one of the upper tether and the lower tether is longer than the other.

3. The vehicle side airbag device according to claim 1 or 2, wherein the upper tether is longer than the lower tether.

4. The vehicle side airbag device according to claim 1 or 2, wherein the lower tether is longer than the upper tether.

5. The length of the upper tether is shorter than the distance from the connection portion of the main chamber with the upper tether to the connection portion of the sub-chamber with the upper tether when the main chamber and the sub-chamber expand and deploy in a state where the upper tether and the lower tether are omitted. The vehicle side airbag device according to claim 1 or 2.

6. The length of the lower tether is shorter than the distance from the connection portion of the main chamber with the lower tether to the connection portion of the sub-chamber with the lower tether when the main chamber and the sub-chamber are inflated and deployed with the lower tether and the upper tether omitted. The vehicle side airbag device according to claim 1 or 2, characterized by this.

Images