Side airbag device

Abstract

The present invention provides a side airbag device capable of effectively suppressing shake of an airbag cushion and improving restraint performance. A side airbag device (100) is provided with: a rear chamber (116) having an elongated shape in the vertical direction; a front chamber (118) that expands forward and upward of the rear chamber (116); the inflator (108) is arranged in the rear part of the rear cavity (116); and a first tether (112) that is cloth-shaped and disposed outside the rear cavity (116), has a front end (122) connected to a leading edge portion (124) of the rear cavity (116) and a rear end (126) connected to a rear portion of the rear cavity (116), and is tensioned when the rear cavity (116) is expanded and deployed. The capacity of the rear cavity (116) is smaller than the capacity of the front cavity (118), the vertical direction of the first tether (112) is longer than the front-rear direction, and the front end (122) of the first tether (112) is connected to a range of the front edge portion (124) of the rear cavity (116) including at least the lower end (146).

Description

[0001] This application is a divisional application based on the invention with application number 201880029148.4, application date May 8, 2018, applicant being Autoliv Development Company, and invention name being “Side Airbag Device”. Technical Field

[0002] The present invention relates to a side airbag device for restraining a vehicle occupant from the side. Technical Background

[0003] In recent years, airbags have become standard equipment in vehicles. Airbags are safety devices that activate in emergency situations such as vehicle collisions. Air pressure inflates the airbag cushions, catching and protecting the occupants.

[0004] Airbag systems come in a variety of types depending on their installation location and purpose. For example, front airbags are installed in the center of the steering wheel to protect the driver from front-to-back collisions. Curtain airbags are installed near the ceiling above the side windows, and side airbags are installed near the sides of the seats, to protect passengers from impacts in the vehicle width direction, such as from a side collision.

[0005] To improve restraint performance, an airbag cushion preferably inflates and deploys more smoothly. For example, in a side impact airbag device, namely a side airbag, described in Patent Document 1, a tether 60, namely an upper tether portion 61 and a lower tether portion 65, is provided on the outside of the airbag 40 to prevent unnecessary movement of the airbag 40.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2016-83955 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] Patent Document 1 describes a method of restricting the airbag's rotation toward the front of the vehicle during inflating and deployment by tensioning a lanyard. However, the lanyard in Patent Document 1 is a long, belt-like member extending in the front-to-back direction, which may cause slack. This leaves room for improvement in order to ensure that the tension effectively acts on the airbag.

[0011] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a side airbag device that can effectively suppress the shaking of the airbag cushion and improve the restraint performance.

[0012] Solutions to the Problem

[0013] In order to solve the above-mentioned problems, the representative structure of the side airbag device involved in the present invention is that it comprises: a rear chamber that is inflated and deployed from the side of the vehicle seat and is elongated in the vertical direction; a front chamber that is connected to the front edge portion of the rear chamber and is inflated and deployed toward the front and upper part of the rear chamber; an inflator that is built into the rear part of the rear chamber and is elongated in the vertical direction; a first tether that is cloth-like and is arranged on the outside of the rear chamber, with a front end connected to the front edge portion of the rear chamber and a rear end connected to the rear part of the rear chamber, and is tensioned when the rear chamber is inflated and deployed, and is characterized in that the capacity of the rear chamber is smaller than that of the front chamber, the first tether is longer in the vertical direction than in the front-back direction, and the front end of the first tether is connected to the front edge portion of the rear chamber over a range including at least the lower end.

[0014] Because the first tether is short in the front-to-back direction, the tension generated in that direction is stronger. Furthermore, because the first tether is long in the vertical direction, the front edge is also long in the vertical direction and can be connected to the rear cavity over a longer range. This first tether effectively applies tension to the rear cavity, effectively limiting its front-to-back movement. The rear cavity is located at the base of the entire airbag cushion, containing the inflator. The rear cavity has a small capacity and quickly reaches a high pressure state immediately after the inflator is activated. Therefore, the first tether is also quickly and strongly tensioned. Therefore, with the above-described structure, by using the first tether to support the rear cavity, the base of the airbag cushion, with strong tension, it is possible to prevent the entire airbag cushion from shaking, thereby improving the restraint performance of the airbag cushion.

[0015] The side airbag device also includes a second tether, which is in a cloth-like shape and is arranged outside the front chamber and the rear chamber. The front end of the second tether is connected to the front edge of the front chamber and the rear end is connected to the rear part of the rear chamber. The second tether is tensioned when the front chamber and the rear chamber are inflated and deployed.

[0016] By providing the second tether, it is possible to prevent shaking in the vehicle width direction starting from the boundary between the front chamber and the rear chamber.

[0017] The second tether may be configured to be longer in the front-to-back direction than in the top-to-bottom direction. Utilizing this structure, a second tether capable of preventing the front cavity from shaking may be realized.

[0018] The front end of the second tether can be connected to the leading edge portion of the front cavity in a range longer than the range at which the rear end of the second tether is connected to the rear portion of the rear cavity. Utilize this structure, the second tether can effectively pull the front cavity and prevent it from shaking.

[0019] The length from the front end to the rear end of the second tether can be set to be shorter than the length of the path from the front edge of the front cavity to the rear end of the rear cavity when the front and rear cavities are expanded and deployed without bending. If the second tether has this length, it can be effectively tensioned according to the expansion and deployment of the front and rear cavities.

[0020] The side airbag device also includes two studs spaced apart in the longitudinal direction of the inflator, which are exposed from the rear cavity and fastened to the vehicle seat. The rear end of the first tether is fastened to the rear portion of the rear cavity via the two studs. This arrangement allows for efficient tensioning of the first tether.

[0021] The front end of the first tether may have a length greater than the distance between the two studs. With the first tether of this structure, tension can be effectively applied to the rear cavity.

[0022] The front end of the first tether can be connected to the front edge of the rear cavity, including the shortest distance to the stud. With the first tether of this structure, tension can be effectively applied to the rear cavity.

[0023] The side airbag device also includes two studs spaced apart in the length direction on the inflator, exposed from the rear cavity and secured to the vehicle seat. The rear end of the second tether can be secured to the rear portion of the rear cavity by at least one of the two studs. This configuration effectively tightens the second tether to apply tension to the rear cavity.

[0024] Effects of the Invention

[0025] According to the present invention, it is possible to provide a side airbag device that can effectively suppress the shaking of the airbag cushion and improve the restraint performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a diagram illustrating a side airbag device according to an embodiment of the present invention.

[0027] Figure 2 Observed from the side Figure 1 (b) Diagram of the airbag cushion.

[0028] Figure 3 yes Figure 1 (a) Detailed view of the airbag cushion.

[0029] Figure 4 It is magnified Figure 3 The diagram near the rear cavity is shown as an example.

[0030] Figure 5 This is an example Figure 1 (a) is a diagram showing the state of the airbag cushion when it is inflated and deployed.

[0031] Figure 6 This is an example Figure 2 FIG. 5 is a diagram of a modified example of the second tether. DETAILED DESCRIPTION

[0032] The following describes preferred embodiments of the present invention in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values ​​shown in the embodiments are merely examples to aid understanding of the present invention and, unless otherwise specified, do not limit the present invention. Furthermore, in this specification and the accompanying drawings, elements having substantially the same function and structure are labeled with the same reference numerals, and repeated descriptions are omitted. Elements not directly related to the present invention are also omitted.

[0033] Figure 1 1 is a diagram illustrating a side airbag device 100 according to an embodiment of the present invention. Figure 1 (a) shows the side airbag device 100 and the left side seat 102 of the vehicle to which the side airbag device 100 is applied, viewed from the right side in the vehicle width direction, that is, from the outer side in the vehicle width direction (the outer side of the vehicle). Figure 1 In (a) and all figures in this application, the front and rear directions of the vehicle are indicated by arrows F (Forward) and B (Back), the left and right directions of the vehicle width are indicated by arrows L (Left) and R (Right), and the up and down directions of the vehicle are indicated by arrows U (Up) and D (Down), respectively.

[0034] like Figure 1 As shown in FIG. 1A , a side airbag device 100 is installed inside a seatback 104 of a seat 102 in the present embodiment, on the vehicle widthwise inner side (inside the vehicle). The side airbag device 100 includes an airbag cushion (airbag cushion 106) that restrains the occupant and an inflator 108 that supplies gas to the airbag cushion 106. Before deployment, the airbag cushion 106 is rolled or folded and stored in a housing or the like built into the side portion of the seatback 104 on the vehicle interior side. The stored airbag cushion 106 is covered by a seat cover or the like, and therefore cannot be seen from the outside.

[0035] The inflator 108 is a gas generating device, and in this embodiment, is a cylinder-type, or cylindrical, design. The inflator 108 is built into the rear portion of a rear chamber 116, described later, within the airbag cushion 106, with its long side extending vertically along the seatback 104. The inflator 108 is electrically connected to the vehicle and activates upon receiving a signal from the vehicle indicating a collision, thereby supplying gas to the airbag cushion 106.

[0036] Currently popular inflators include a type that is filled with a gas generating agent and combusts to generate gas, a type that is filled with compressed gas and supplies gas without generating heat, or a type that utilizes a mixture of combustion gas and compressed gas. Any type of inflator 108 can be used.

[0037] The inflator 108 includes two studs 110a and 110b spaced apart in the longitudinal direction. The studs 110a and 110b penetrate the base fabric of the airbag cushion 106, are exposed to the outside, and are fastened to, for example, the frame of the seat back 104. Since the studs 110a and 110b penetrate the airbag cushion 106 and are fastened to the seat back 104, the airbag cushion 106 is also attached to the seat back 104.

[0038] Figure 1 (b) is an example Figure 1 (a) shows the airbag cushion 106 after it has inflated and deployed. When a collision is detected by sensors in the vehicle, the inflator 108 receives an activation signal and releases gas. This gas causes the airbag cushion 106 to break through the seat cushion 106 cover and inflate and deploy into the interior of the vehicle.

[0039] The airbag cushion 106 inflates and deploys in a flat shape. The outer surface of the airbag cushion 106 includes a main panel 106a on the left side in the vehicle width direction and a main panel 106b on the right side in the vehicle width direction. The main panels 106a and 106b are made of a base fabric and are formed into a bag shape by sewing, bonding, or other methods. Alternatively, the airbag cushion 106 can be formed using OPW (One-Piece Woven) weaving.

[0040] In this embodiment, to suppress the shaking of the airbag cushion 106, two tethers, a first tether 112 and a second tether 114, are provided outside the airbag cushion 106. The structure of the airbag cushion 106 will be further described below, focusing on the structure and function of each tether.

[0041] Figure 2 Observed from the side Figure 1 (b) is a diagram of the airbag cushion 106. Figure 2 (a) shows a general overview of the airbag cushion 106. A first tether 112 and a second tether 114 are attached to the outside of the airbag cushion 106. These tethers are fabric-like members, for example, formed from the same type of base fabric as the main panel 106a. The first tether 112 and the second tether 114 are both tensioned during inflation and deployment of the airbag cushion 106, applying tension to the airbag cushion 106 and suppressing its oscillation.

[0042] Figure 2 (b) is removed Figure 2(a) is a diagram of the first tether 112 and the second tether 114. Before describing each tether, each part of the airbag cushion 106 will be described in detail.

[0043] The interior of the airbag cushion 106 is divided into a rear chamber 116 and a front chamber 118. The rear chamber 116 is the base portion of the airbag cushion 106 and is formed at the lower portion of the rear side of the vehicle. The rear chamber 116 is elongated in the vertical direction along the seat back 104. Figure 1 (b).

[0044] Because the inflator 108 is built in, see Figure 3 The rear chamber 116 is provided with two bolt holes 120 for the studs 110a and 110b to pass through. The capacity of the rear chamber 116 is smaller than that of the front chamber 118. Upon activation, the inflator 108 quickly reaches a high pressure state. Through the rear chamber 116, the surface of the seat back 104 rapidly ruptures, allowing the entire airbag cushion 106 to rapidly inflate and deploy.

[0045] The first tether 112 is disposed outside the rear cavity 116, with a front end 122 connected to a front edge portion 124 of the rear cavity 116 and a rear end 126 connected to the rear portion of the rear cavity 116. In this embodiment, the rear end 126 of the first tether 112 is provided with two bolt holes 128 and is fixed to the rear portion of the rear cavity 116 by two studs 110a and 110b.

[0046] The vehicle front-to-rear length of the first tether 112 from its front end 122 to its bolt hole 128 is shorter than the vehicle front-to-rear length from its leading edge 124 when the rear chamber 116 is deployed to its bolt hole 120. This structure allows the side airbag device 100 to efficiently tension the first tether 112. As the rear chamber 116 expands and deploys, the first tether 112 becomes tensioned, pulling the leading edge 124 of the rear chamber 116 toward the rear of the vehicle and suppressing any oscillation of the rear chamber 116.

[0047] The front chamber 118 is formed in contact with the front edge portion 124 of the rear chamber 116 and expands forward and upward of the rear chamber 116. The front chamber 118 expands from the seat back 104 to the area where the occupant in the front of the vehicle is located, actively restraining the occupant.

[0048] The second tether 114 is disposed outside the front cavity 118 and the rear cavity 116, with a front end 130 connected to a front edge portion 132 of the front cavity 118 and a rear end 134 connected to the rear portion of the rear cavity 116. In this embodiment, the rear end 134 of the second tether 114 is provided with a bolt hole 136 and is fastened to the rear portion of the rear cavity 116 by one of the studs 110a, 110b, for example, the stud 110a.

[0049] The vehicle longitudinal length of the second tether 114, from its front end 130 to its bolt hole 136 at its rear end 134, is also shorter than the vehicle longitudinal length of its path from the leading edge 132 of the front chamber 118 to the bolt hole 120 when the airbag cushion 106 is not bent and inflated. This structure allows the side airbag device 100 to efficiently tension the second tether 114. Consequently, the second tether 114 is tensioned as the front chamber 118 and rear chamber 116 inflate and deploy, primarily suppressing oscillation of the front chamber 118.

[0050] Figure 3 yes Figure 1 (a) is a detailed view of the airbag cushion 106, and Figure 1 (b) Corresponding. A baffle 138 is provided within the airbag cushion 106 to separate the rear chamber 116 from the front chamber 118. Baffle 138 is a wall-like portion formed from the same base fabric as the main panel 106a and the like, and is connected to the main panels 106a and 106b in the vehicle width direction. Baffle 138 is provided with a plurality of vent holes 140, 142, etc. Vent holes 140, 142, etc. serve as gas flow openings, allowing gas to pass from the rear chamber 116 to the front chamber 118.

[0051] An internal tether 144 is also provided within the airbag cushion 106. The internal tether 144 is also formed using the same base fabric as the main panels 106a and 106b and is connected to the main panels 106a and 106b in the vehicle width direction, thereby limiting the width of the airbag cushion 106 in the vehicle width direction. Furthermore, a predetermined external exhaust port (not shown) is provided at a predetermined position within the airbag cushion 106 for exhausting gas to the outside.

[0052] The front end 122 of the first tether 112 can be connected to the main panel 106a by sewing, for example, along the portion where the fender 138 is sewn to the main panel 106a. The first tether 112 is longer in the vertical direction than in the front-to-back direction. Specifically, the front end 122 is longer than the distance D1 between the two studs 110a and 110b. The first tether 112 is shorter in the front-to-back direction of the vehicle, while the front end 122 is also longer in the vertical direction. This allows tension to be applied to a larger area of ​​the rear compartment 116, pulling the vehicle rearward, thereby suppressing swaying of the rear compartment 116.

[0053] The front end 122 of the first tether 112 is connected to the leading edge 124 of the rear chamber 116, extending over a region including at least the lower end 146. Since the inflator 108 is located in the rear lower portion, the entire airbag cushion 106 inflates and deploys forward and diagonally upward. Because the front end 122 of the first tether 112 supports the lower end 146 of the rear chamber 116, oscillation of the entire airbag cushion 106 is effectively suppressed.

[0054] Figure 4 It is magnified Figure 3The diagram illustrates an example of a tether 112 positioned near the rear cavity 116. The front end 122 of the first tether 112 is connected to a portion of the front edge 124 of the rear cavity 116, encompassing portions P1 and P2, which are the shortest distances from the studs 110a and 110b. With this structure, the first tether 112 is effectively tensioned between the studs 110a and 110b and the front edge 124 of the rear cavity 116, effectively applying tension to the rear cavity 116 to suppress shaking.

[0055] Refer again Figure 3 The second tether 114 is configured to be longer in the front-to-back direction than in the top-to-bottom direction. This structure allows the second tether 114 to extend from the stud 110a to the front edge 132 of the front cavity 118, thereby preventing the front cavity 118 from shaking.

[0056] In this embodiment, the area where the front end 130 of the second tether 114 connects to the front edge 132 of the front chamber 118 is sewn over a longer range than the area where the rear end 134 of the second tether 114 connects to the rear portion of the rear chamber 116, i.e., the area through which the stud 110a penetrates. With this structure, when the airbag cushion 106 inflates and deploys, the second tether 114 can efficiently pull the front edge 132 of the front chamber 118 toward the stud 110a, effectively preventing the front chamber 118 and, more importantly, the airbag cushion 106 from shaking as a whole.

[0057] Figure 5 This is an example Figure 1 (a) is a diagram showing a state in which the airbag cushion 106 is inflated and deployed. Figure 5 (a) is a diagram showing the airbag cushion 106 as viewed from the outside of the vehicle, and the movement of the airbag cushion 106 in the vehicle front-rear direction is illustrated by the dotted line. Figure 5 As shown in (a), the conventional airbag cushion 10 can be tilted forward by the pressure of gas supplied from the inflator or can be tilted rearward by a recoil force.

[0058] The airbag cushion 106 of this embodiment supports the rear chamber 116 by tensioning the first tether 112. The rear chamber 116 is provided in the inflator 108 (see Figure 3 The rear cavity 116 is located at the base of the entire airbag cushion 106 (e.g., the inflator 108). The rear cavity 116 has a relatively small volume and is immediately under high pressure upon activation of the inflator 108. Consequently, the first tether 112 is also rapidly and strongly tensioned. Therefore, in this embodiment, the strong tension of the first tether 112 supports the rear cavity 116 at the base of the airbag cushion 106, thereby preventing the entire airbag cushion 106 from swaying in the fore-aft direction and improving the restraint performance of the airbag cushion 106.

[0059] Figure 5(b) is a schematic diagram of the airbag cushion 106 viewed from above, with the dashed lines illustrating the movement of the conventional airbag cushion 10 in the vehicle width direction. Conventional airbag cushions 10 may sometimes oscillate in the vehicle width direction due to gas pressure. However, in this embodiment, in addition to the first tether 112, the second tether 114 is also tensioned, thereby applying tension to the front chamber 118, pulling it toward the rear of the vehicle. This prevents the airbag cushion 106 from oscillating in the vehicle width direction, particularly oscillating in the vehicle width direction starting from the boundary between the front chamber 118 and the rear chamber 116.

[0060] As described above, the side airbag device 100 of this embodiment can effectively suppress the oscillation of the airbag cushion 106 using the first tether 112 and the second tether 114, thereby improving the restraint performance of the airbag cushion 106. Furthermore, in this embodiment, the first tether 112 and the second tether 114 are both provided on the passenger side of the airbag cushion 106. However, they may be provided on the side opposite to the passenger, or separately on the passenger side and the opposite side.

[0061] In this embodiment, the airbag cushion 106 is described as being positioned on the vehicle interior side of the seatback 108. Since there are no supporting structures, such as side doors, on the vehicle interior side of the seatback 108 for the airbag cushion 106, the first tether 112 and second tether 114, which suppress swaying, are more suitable for functioning. However, the airbag cushion 106 can naturally be positioned on the vehicle exterior side of the seatback 108. In this case, the swaying of the first tether 112 and second tether 114 can also be suppressed, thereby improving the restraint performance of the airbag cushion 106.

[0062] Figure 6 It shows Figure 2 FIG. 2 shows a modified example of the second tether 114, namely, second tether 200. The upper and lower edges of second tether 114 are formed into a substantially parallel strip shape, while the upper and lower edges of front end 202 of second tether 200 are wider than those of rear end 204, resulting in an upper edge 206 and lower edge 208 extending non-parallel from rear end 204 toward front end 202. In this structure of second tether 200, front end 202 is also sewn to front edge 132 of front chamber 118 over a longer range than rear end 204. This effectively pulls front edge 132 toward rear end 204, preventing the airbag cushion 106 from oscillating.

[0063] in addition, Figure 2 The second tether 114 and Figure 6Although the second tether 200 is illustrated as a polygon in the figures, this shape is not limited thereto. For example, even if the outline is a rounded shape like an ellipse without corners, the function of pulling the front chamber 118 rearward can be achieved. Even with this shape, the front end of the second tether is connected to the front edge portion 132 of the front chamber 118 over a width greater than the rear end, effectively pulling the front chamber 118 rearward to suppress the shaking of the airbag cushion 106.

[0064] While preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it is understood that the present invention is not limited to the examples described. Those skilled in the art will appreciate that various changes or modifications are readily conceivable within the scope of the claims, and these also fall within the technical scope of the present invention.

[0065] Furthermore, in the above-described embodiment, an example in which the airbag device according to the present invention is applied to an automobile has been described. However, the airbag device according to the present invention may be applied to aircraft, ships, and the like in addition to automobiles, and similar effects can be obtained.

[0066] Industrial applicability

[0067] The present invention can be used in a side airbag device for restraining a vehicle occupant from the side.

[0068] Explanation of symbols

[0069] 100…Side airbag device 102…Seat

[0070] 104…Seat back 106…Airbag cushion

[0071] 106a…left main panel 106b…right main panel

[0072] 108…Inflator 110a…Upper stud

[0073] 110b…lower stud 112…first tether

[0074] 114…Second tether 116…Back chamber

[0075] 118…front chamber 120…bolt holes for the rear chamber

[0076] 122 ... front end of the first tether 124 ... front edge of the rear cavity

[0077] 126 ...rear end of the first tether 128 ...bolt hole of the first tether

[0078] 130 ... front end of the second tether 132 ... front edge of the front cavity

[0079] 134 ... rear end of the second tether 136 ... bolt hole for the second tether

[0080] 138…Baffle 140, 142…Exhaust hole

[0081] 144...Internal tether 146...Lower end of the front edge of the rear cavity

[0082] 200 ... second tether of the modified example 202 ... front end of the second tether of the modified example

[0083] 204 ... rear end of the second tether of the modified example 206 ... upper side of the second tether of the modified example

[0084] 208…lower side of the second tether of the modified example D1…distance between studs

[0085] 10…Traditional airbag cushion

Claims

1. A side airbag device for restraining a vehicle occupant from the side, characterized in that: have: An airbag cushion comprising: a rear chamber that expands and deploys from a side portion of a seat back of a vehicle seat and is elongated in the vertical direction; and a front chamber that is connected to a front edge portion of the rear chamber and expands and deploys forward and upward of the rear chamber; and The inflator is built into the rear portion of the rear cavity and is long in the vertical direction. The inflator includes a stud that penetrates a bolt hole of the base fabric of the rear chamber of the airbag cushion to be exposed to the outside and is fastened to the seat back. The side airbag device comprises: a first tether in a cloth-like shape and disposed outside the rear cavity, with a front end connected to a front edge portion of the rear cavity and a rear end connected to the bolt hole of the rear cavity, and being tensioned when the rear cavity is expanded; and The second tether is in a cloth-like shape and is arranged outside the front cavity and the rear cavity, with its front end connected to the front edge portion of the front cavity and its rear end connected to the bolt hole of the rear cavity, and is tensioned when the front cavity and the rear cavity are expanded. The capacity of the rear chamber is smaller than that of the front chamber, The first tether is longer in the up-down direction than in the front-to-back direction, and the front end of the first tether is connected to the front edge portion of the rear chamber, including at least the lower end, to support the lower end of the rear chamber. The length of the first tether from the front end to the bolt hole in the vehicle front-to-back direction is shorter than the length from the front edge portion of the rear chamber when deployed to the bolt hole in the vehicle front-to-back direction, thereby suppressing the entire airbag from shaking in the front-to-back direction. The second tether is longer in the front-to-rear direction than in the up-to-down direction, and the length of the second tether in the vehicle front-to-rear direction from the front end to the bolt hole is shorter than the length of a path in the vehicle front-to-rear direction from the front edge of the front chamber to the bolt hole when the airbag cushion is deployed without bending, thereby preventing the airbag cushion from shaking in the vehicle width direction starting from the boundary between the front chamber and the rear chamber.

2. The side airbag device according to claim 1, wherein: The front end of the second tether is connected to the front edge portion of the front cavity over a longer range than the rear end of the second tether is connected to the rear portion of the rear cavity.

3. The side airbag device according to claim 1 or 2, characterized in that: The inflator includes two studs that are separated from each other in the length direction of the inflator, and the rear end of the first tether is fastened to the rear portion of the rear cavity via the two studs.

4. The side airbag device according to claim 3, wherein: The front end of the first tether has a length greater than the distance between the two studs.

5. The side airbag device according to claim 3, wherein: The front end of the first tether is connected to a range of the leading edge portion of the rear cavity including a portion that is shortest in distance from the stud.

6. The side airbag device according to claim 1 or 2, characterized in that: The inflator includes two studs that are separated from each other in the longitudinal direction of the inflator, and the rear end of the second tether is fastened to the rear portion of the rear cavity by at least one of the two studs.

Images