Curtain airbag system

Abstract

To provide a curtain airbag device which can efficiently reduce an injury value of an occupant during an emergency.SOLUTION: An airbag cushion 124 of a curtain airbag device 100 includes: a second main chamber 138b etc. which is inflated and deployed so as to cover a side window 116 on a cabin side wall; an upper non-inflation area located around the second main chamber 138b etc.; a lower chamber 140 which is provided extending downward from the second main chamber 138b; a lower non-inflation area 141 located near a lower end of the lower chamber 140; and tethers 142, 144 which span the upper non-inflation area and the lower non-inflation area 141 and hang the lower chamber 140 so that the lower chamber bends to the vehicle inner side relative to the second main chamber 138b.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a curtain airbag device that protects passengers during side collisions or rollovers of a vehicle.

Background Art

[0002] A curtain airbag device includes an airbag cushion that covers a side window or the like on the side wall of a vehicle compartment in an emergency, and receives and restrains a passenger from the side. The airbag cushion of the curtain airbag device is required to appropriately cover the side window in order to prevent the passenger from being ejected outside the vehicle even when the vehicle transitions from a side collision to a rollover.

[0003] The airbag cushion of the curtain airbag device is stored along the longitudinal direction of the vehicle in a roof side rail at the upper part of the vehicle compartment side wall. In order to store the airbag cushion of the curtain airbag device in a limited space, it is stored in a long storage form that is rolled up in a roll shape or folded in a bellows shape from the lower end side. For example, FIG. 5 of Patent Document 1 discloses a state in which an airbag 20 wound in a cylindrical shape is stored so as to be covered by an airbag cover 11 above a window W1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] The airbag 20 of Patent Document 1 is provided with a support inflation part 30 supported by a door trim at the lower part of the sub-inflation part 29 so that the airbag 20 can be supported at the upper part of the door trim even during rollover, and this support inflation part 30 is folded back to the inside of the vehicle and stored.

[0006] In a side collision involving a vehicle, if the collision speed is high, it is known that the door trim is displaced inward, while the occupant's head tends to fall outward, i.e., towards the door trim, due to inertia. In such a situation, the airbag 20 described in Patent Document 1 still has room for improvement in protecting the occupant's head from contact with the door trim. [Problems that the invention aims to solve]

[0007] In view of these problems, the present invention aims to provide a curtain airbag system that can efficiently reduce the injury level of occupants in an emergency. [Means for solving the problem]

[0008] To solve the above problems, a typical configuration of the curtain airbag device according to the present invention is a curtain airbag device comprising an airbag cushion that is stored in a long, elongated form in the longitudinal direction of the vehicle and attached to the upper part of the side wall of the passenger compartment, and an inflator that supplies gas to the airbag cushion, wherein the airbag cushion is characterized by having a main chamber that inflates and unfolds to cover the side window of the side wall of the passenger compartment, an upper non-inflated region around the main chamber, a lower chamber that extends downward from the main chamber, a lower non-inflated region near the lower end of the lower chamber, and one or more tethers that span the upper non-inflated region and the lower non-inflated region and lift the lower chamber so that it bends inward relative to the main chamber.

[0009] With the above configuration, by suspending the lower chamber by a tether so that it bends inward, the head, which would otherwise fall outward during a side collision, is restrained from below by the lower chamber, preventing contact of the head with the door trim. Therefore, with the above configuration, it is possible to efficiently reduce occupant injury in collision scenarios in which the door trim is displaced inward due to impact.

[0010] The upper inflation region described above includes a partition that divides the main chamber into multiple chambers and an upper edge near the upper edge of the airbag cushion, and the upper ends of one or more tethers may be connected to the partition or the upper edge.

[0011] With the above configuration, by stretching the tether between the compartment or upper edge and the lower non-expanding section, the lower chamber can be efficiently lifted by the tether.

[0012] The one or more tethers described above may be used to suspend the lower chamber so that it is perpendicular to the interior of the vehicle relative to the main chamber.

[0013] With the above configuration, the lower chamber can restrain the head from below, preventing it from falling outwards and thus preventing it from contacting the door trim.

[0014] The above tether may be provided in multiple quantities, and the multiple tethers may include a first tether joined to the vicinity of the leading edge of the lower chamber in the lower non-expanding region, and a second tether joined to the vicinity of the trailing edge of the lower chamber in the lower non-expanding region.

[0015] With the above configuration, it becomes possible to efficiently lift the lower chamber using multiple tethers.

[0016] In the upper non-inflated region described above, a seam is formed where the outer panel on the outside of the vehicle and the inner panel on the inside of the vehicle of the airbag cushion are joined, and the upper ends of one or more tethers may be joined to predetermined locations in the seam.

[0017] With the above configuration, it becomes possible to efficiently lift the lower chamber using multiple tethers.

[0018] The above-mentioned seam portion has a circular or curved island seam formed at the end of the linearly extending portion, and the upper end of one or more tethers may be joined to the island seam.

[0019] With the above configuration, it is also possible to efficiently lift the lower chamber by means of a plurality of tethers.

[0020] A plurality of the above-mentioned tethers are provided, and the plurality of tethers may be provided so as to be parallel to each other.

[0021] With the above configuration, it is also possible to efficiently lift the lower chamber by means of a plurality of tethers.

[0022] The above-mentioned tether may be provided so as to straddle in the vertical direction a virtual line extending in the front-rear direction along the lower edge of the main chamber in a state where the airbag cushion is spread out flat.

[0023] With the above configuration, it is also possible to efficiently lift the lower chamber by means of a plurality of tethers.

[0024] The above airbag cushion further has a partition seam provided so as to extend in the vehicle front-rear direction between the main chamber and the lower chamber, and the partition seam may be formed above the virtual line.

[0025] By starting from the partition seam of the above configuration, it is possible to suitably bend the lower chamber toward the vehicle interior side.

[0026] The above airbag cushion may further have one or a plurality of duct portions connecting at least one of the front side or the rear side of the lower chamber to the upper main chamber.

[0027] According to the above duct portion, it is possible to efficiently inflate and deploy the lower chamber.

Advantages of the Invention

[0028] According to the present invention, it is possible to provide a curtain airbag device capable of efficiently suppressing the injury value of an occupant in an emergency situation.

Brief Description of the Drawings

[0029] [Figure 1] This figure illustrates an overview of a curtain airbag device according to an embodiment of the present invention. [Figure 2] This figure shows an example of the airbag cushion shown in Figure 1(b) on its own. [Figure 3] Figure 2(d) illustrates the process by which the airbag cushion restrains the occupant during a side collision. [Figure 4] This figure illustrates the first and second modified versions of the airbag cushion shown in Figure 2. [Figure 5] This figure illustrates the third and fourth modified versions of the airbag cushion shown in Figure 2. [Modes for carrying out the invention]

[0030] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values ​​shown in these embodiments are merely illustrative to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations.

[0031] Figure 1 is a diagram illustrating an overview of a curtain airbag device 100 according to an embodiment of the present invention. Figure 1(a) illustrates the curtain airbag device 100 before activation. The curtain airbag device 100 illustrated in the figure is for the left side of the vehicle compartment, but a similar symmetrical structure is also available for the right side, which is not shown.

[0032] In the following diagrams, including Figure 1(a), the vehicle's front-rear direction is indicated by arrows F (Forward) and B (Back), the left-right direction in the vehicle's width direction is indicated by arrows L (Left) and R (Right), and the vehicle's up-down direction is indicated by arrows U (Up) and D (Down). Specifically, "up" refers to the direction of the head from the perspective of an occupant in a properly seated position, and "down" refers to the direction of the lower limbs from the perspective of the same occupant.

[0033] Vehicle 102 is assumed to be a two-row seat vehicle with front seats 104 and rear seats 106 arranged from the front of the vehicle. Vehicle 102 is provided with multiple pillars that support the roof. The multiple pillars include A-pillar 108, B-pillar 110, and C-pillar 112 from the front of the vehicle.

[0034] The roof side rail 114 is a component that forms the upper part of the side wall of the passenger compartment. The roof side rail 114 is covered by a roof trim (not shown). The side wall of the passenger compartment is provided with side windows 116 and 118, surrounded by the roof side rail 114, each pillar, and door trims 146 and 147.

[0035] Before deployment, the airbag cushion 124 of the curtain airbag system 100 is stored in a long, elongated form in the longitudinal direction of the vehicle by being rolled up or folded. The airbag cushion 124 is mounted from near the A-pillar 108 along the roof side rail 114. Before deployment, the airbag cushion 124 is hidden by a roof trim (not shown) and is therefore not visible to the occupants.

[0036] The curtain airbag system 100 includes an inflator 126 as a gas generator that supplies gas to the airbag cushion 124. In this embodiment, the inflator 126 is a cylindrical type and is fixed to the roof side rail 114 with a portion of it inserted into the airbag cushion 124. The airbag cushion 124 has an inflator mounting section 128 provided at the rear upper part for attaching the inflator 126.

[0037] Inflators currently in use include types that are filled with a gas generating agent and burned to produce gas, types that are filled with compressed gas and supply gas without generating heat, and hybrid types that utilize both combustion gas and compressed gas. Any of these types can be used with Inflator 126.

[0038] Figure 1(b) illustrates the state after the curtain airbag system 100 has been activated. The curtain airbag system 100 is activated when an offset collision or side collision is predicted or detected by various sensors. The inflator 126 is activated by a signal from a control unit (not shown), and the airbag cushion 124 inflates and deploys by the pressure of the gas supplied from the inflator 126, pushing aside a roof trim (not shown) to restrain the occupant.

[0039] The airbag cushion 124 inflates and deploys widely in the longitudinal direction of the vehicle along the side windows 116 and 118 on the exterior side of the front seat 104 and rear seat 106. The inflation sections of the airbag cushion 124 are divided into small chambers according to the gas flow and structures such as occupants and seats.

[0040] The airbag cushion 124 has multiple tabs 130 on its upper edge as a part for fixing to the roof side rail 114. The tabs 130 are strip-shaped parts that are fixed to the roof side rail 114 using brackets, bolts, etc.

[0041] A strap 132 is provided at the front end of the airbag cushion 124. The strap 132 is a string-like member and is connected to the A-pillar 108. The strap 132 has the effect of suppressing the swinging of the airbag cushion 124 when it inflates and deploys, thereby enabling the airbag cushion 124 to quickly cover the desired area. In addition to the strap 132 at the front end, a similar strap can also be used to connect the rear end of the airbag cushion 124 to the C-pillar 112.

[0042] Figure 2 is a diagram illustrating the airbag cushion 124 shown in Figure 1(b) on its own. Figure 2(a) illustrates the overall outline of the airbag cushion 124.

[0043] The airbag cushion 124 is formed into a bag shape by, for example, sewing the base fabric that makes up its surface together on the front and back, or by weaving it using OPW (One-Piece Woven).

[0044] The airbag cushion 124 is provided with an inflatable section that expands and deploys with gas, including an upper duct section 136 extending in the front-rear direction from the inflator mounting section 128, a plurality of main chambers extending from the first main chamber 138a to the fifth main chamber 138e for restraining the occupant, and a lower chamber 140.

[0045] The first main chamber 138a to the fifth main chamber 138e constitute the main area of ​​the airbag cushion 124, broadly covering the side windows 116, 118 (see Figure 1(a)), restraining occupants inside the vehicle and preventing them from moving outside. The first main chamber 138a to the fourth main chamber 138d primarily restrain occupants of the front seats 104, while the fifth main chamber 138e primarily restrains occupants of the rear seats 106.

[0046] The lower chamber 140 is located primarily to the side of the front seat 104, preventing the heads of the occupants of the front seat 104 from coming into contact with the door trim 146 (see Figure 1(a)). In this embodiment, the lower chamber 140 is located below the second main chamber 138b and the third main chamber 138e.

[0047] The lower chamber 140 is configured to expand and deploy while being suspended by two tethers 142 and 144 at the front and rear.

[0048] Figure 2(b) shows the airbag cushion with the tethers 142 and 144 removed, as shown in Figure 2(a). The lower chamber 140 is provided so as to extend from the lower ends of the second main chamber 138b and the third main chamber 138c to below the upper end 170 of the door trim 146 (see Figure 1(a)) when the airbag cushion 124 is spread out on a flat surface.

[0049] Of the airbag cushion 124, the inflatable parts such as the main chamber other than This is an upper non-inflatable region. The upper non-inflatable region includes the upper edge portion 134 that forms the upper edge of the airbag cushion 124, and partition portions such as the seam portion 148a that divides each main chamber. In addition, near the lower end of the lower chamber 140, a lower non-inflatable region 141 is formed as a non-inflatable region, extending forward, backward and downward from the lower chamber 140.

[0050] As the partition of the upper non-inflatable region described above, seam portions 148a, 148b, and 148c are provided at various locations to partition the main chamber into multiple chambers, such as the first main chamber 138a to the fourth main chamber 138d. Each seam portion is formed by joining the outer panel 124a on the outside of the vehicle (see Figure 2(c)) and the inner panel 124b on the inside of the vehicle of the airbag cushion 124 by sewing, welding, etc., and forms the edge of each chamber partitioned into the first main chamber 138a, etc., and also forms the boundary between the inflatable region and the non-inflatable region.

[0051] For example, a first seam portion 148a is provided between the first main chamber 138a and the second main chamber 138b. Also, a second seam portion 148b is provided between the second main chamber 138b and the third main chamber 138c. Furthermore, for example, the fourth main chamber 138d is bordered by the third seam portion 148c, and the fifth main chamber 138e is bordered by the fourth seam portion 148d.

[0052] Each seam extends linearly, with its tip formed in a circular or curved shape. For example, the first seam 148a has a linear seam 150 that extends linearly and a curved island seam 152 provided at the tip of the linear seam 150. By providing the island seam 152, it is possible to distribute the force during expansion and deployment.

[0053] The lower end 142b of the front first tether 142 is joined to the leading edge portion 154 near the leading edge of the lower chamber 140 within the lower non-expanding region 141. The upper end 142a of the tether 142 is joined to the island seam 152 of the first seam portion 148a. The lower end 144b of the rear second tether 144 is joined to the trailing edge portion 156 near the trailing edge of the lower chamber 140 within the lower non-expanding region 141, and the upper end 144a is joined to the island seam 158 of the third seam portion 148c.

[0054] Tethers 142 and 144 are attached to the lower chamber 140 at two locations, front and rear, respectively, and are positioned parallel to each other. This configuration allows tethers 142 and 144 to efficiently lift the lower chamber 140.

[0055] Figure 2(c) is a cross-sectional view AA of the airbag cushion 124 in Figure 2(a). As described above, the tether 142 spans the front edge portion 154 of the lower chamber 140 and the island seam 152 at the tip of the first seam portion 148a that forms the edges of the first main chamber 138a and the second main chamber 138b. By spanning the tether 142 between the lower non-inflatable region 141, such as the front edge portion 154, and the upper non-inflatable region, such as the first seam portion 148a, the lower chamber 140 can be efficiently lifted.

[0056] Figure 2(d) is a cross-sectional view of the airbag cushion 124 shown in Figure 2(a). The lower chamber 140 is lifted by the tethers 142 and 144 (see Figure 2(a)) described above so as to bend inward relative to the second main chamber 138b, etc.

[0057] In particular, in this embodiment, the tethers 142 and 144 (see Figure 2(a)) suspend the lower chamber 140 at an angle perpendicular to the interior of the vehicle, relative to the second main chamber 138b, etc., which extends in the vertical direction. With this configuration, the lower chamber 140 can restrain the head of an occupant that is about to fall outwards from below, preventing the head from coming into contact with the door trim 146 (see Figure 3(b)).

[0058] Referring again to Figure 2(b), the tethers 142 and 144 extend from the first main chamber 138a to the fourth main chamber 138d when the airbag cushion 124 is spread out on a flat surface. Upper non-expanding region around the range The tethers 142 and 144 are positioned to straddle a virtual line L1 that extends in the front-rear direction along the lower edge in the vertical direction. This configuration of tethers 142 and 144 makes it possible to efficiently lift the lower chamber 140.

[0059] The airbag cushion 124 has a partition seam 160 extending in the longitudinal direction of the vehicle between the second main chamber 138b and the third main chamber 138c and the lower chamber 140. The partition seam 160 is a non-inflatable portion that partitions the second main chamber 138b and the third main chamber 138c and the lower chamber 140, and is formed above the imaginary line L1.

[0060] As illustrated in Figure 2(d), the lower chamber 140 is configured to bend inward towards the vehicle at the boundary of the partition seam 160. The partition seam 160 is provided as a non-inflatable section between the lower chamber 140 and the second main chamber 138b, etc., which allows the lower chamber 140 to bend inward towards the vehicle even when the entire airbag cushion 124 is inflated and deployed with gas.

[0061] As illustrated in Figure 2(b), the front and rear of the compartment seam 160 are the front duct 162 and the rear duct 164, respectively. The front duct 162 connects the front of the lower chamber 140 to the upper second main chamber 138b, and the rear duct 164 connects the rear of the lower chamber 140 to the upper third main chamber 138c. These front duct 162 and rear duct 164 enable the lower chamber 140 to efficiently expand and deploy by receiving gas from the second main chamber 138b and the third main chamber 138c.

[0062] Figure 3 illustrates the process by which the airbag cushion 124 shown in Figure 2(d) restrains the occupant 166 during a side collision. Figure 3(a) illustrates the situation before the airbag cushion 124 restrains the occupant 166.

[0063] When vehicle 102 (see Figure 1(a)) predicts or detects a collision such as a side collision via various sensors and a predetermined electronic control unit (ECU), it activates the curtain airbag system 100. As a result, the airbag cushion 124 described above inflates and deploys, the second main chamber 138b etc. covers the side window 116, and the lower chamber 140 inflates and deploys so as to protrude inward from below the second main chamber 138b etc.

[0064] Figure 3(b) illustrates the situation when the side collision has progressed further than in Figure 3(a). When a force is applied to the vehicle 102 (see Figure 1(a)) from the side due to a side collision, the door trim 146 is displaced inward. At the moment of impact, the occupant 166 tries to stay in place due to inertia. The occupant's body is pushed and moved by the displaced door trim 146, while the head 168 tries to fall outward due to inertia. Therefore, there is a possibility that the occupant's head 168 will come into contact with the upper end 170 of the door trim 146 from above.

[0065] In the curtain airbag device 100, the lower chamber 140 at the bottom of the airbag cushion 124 is suspended inward by tethers 142 and 144 (see Figure 2(a)), thereby restraining the head 168 from below as it tends to fall outward during a side collision, and preventing the head 168 from contacting the upper end 170 of the door trim 146.

[0066] Thus, the curtain airbag system 100 makes it possible to efficiently reduce occupant injury, especially in the event of a high-speed side collision that causes displacement of the door trim 146.

[0067] (modified version) The following describes variations of each of the components mentioned above. In Figure 4 and subsequent figures, components that have already been described are given the same reference numerals, and thus the explanation of previously described components is omitted. In the following explanation, components with the same name as those already described are assumed to have the same function, even if they are given different reference numerals, unless otherwise specified.

[0068] Figure 4 illustrates first and second modified examples of the airbag cushion 124 shown in Figure 2.

[0069] Figure 4(a) illustrates a first modified example (airbag cushion 200) of the airbag cushion 124 in Figure 2(b). In the airbag cushion 200, the front duct 162 in Figure 2(b) is omitted, and only the rear duct 164 is provided. Even with only the rear duct 164, the lower chamber 140 can receive gas from the third main chamber 138c and efficiently inflate and deploy.

[0070] Figure 4(b) illustrates a second modified example (airbag cushion 220) of the airbag cushion 124 in Figure 2(b). In the airbag cushion 220, the rear duct 164 in Figure 2(b) is omitted, and only the front duct 162 is provided. Even with only the front duct 162, the lower chamber 140 can receive gas from the second main chamber 138b and efficiently inflate and deploy.

[0071] Figure 5 illustrates third and fourth modified examples of the airbag cushion 124 shown in Figure 2.

[0072] Figure 5(a) illustrates a third modified example (airbag cushion 240) of the airbag cushion 124 shown in Figure 2(b). The airbag cushion 240 employs longer tethers 242 and 244 compared to the tethers 142 and 144 in Figure 2(b). The upper ends 242a and 244a of the tethers 242 and 244 are joined to the upper edge portion 134, which is the upper non-inflated region of the airbag cushion 240. These tethers 242 and 244 also enable the lower chamber 140 to be lifted efficiently.

[0073] Figure 5(b) illustrates a fourth modified example (airbag cushion 260) of the airbag cushion 124 in Figure 2(b). In the airbag cushion 260, in addition to the first tether 142 and the second tether 144 in Figure 2(b), a third tether 262 is provided.

[0074] The third tether 262 has its lower end 262b joined to the center of the lower non-expanding region 264 of the lower chamber 140, and its upper end 262a joined to the island seam 266 of the second seam portion 148b. These three tethers 142, 144, and 262 also enable the lower chamber 140 to be lifted efficiently.

[0075] As a further variation, it is also possible to adopt a configuration that uses only one tether. For example, by using only the central tether 262 in Figure 5(b), the lower chamber 140 can be lifted, thereby making it possible to restrain the head 168 of the occupant 166 (see Figure 3(b)) from below.

[0076] Preferred embodiments of the present invention have been described above with reference to the attached drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented or carried out in various ways. Unless otherwise stated in this specification, the present invention is not limited to the detailed shapes, sizes, and configurations of the parts shown in the attached drawings. Furthermore, the expressions and terms used in this specification are for illustrative purposes only and are not limited thereto unless otherwise stated.

[0077] Therefore, it is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally fall within the technical scope of the present invention. [Industrial applicability]

[0078] This invention can be used in curtain airbag systems that protect occupants during side collisions or rollovers of a vehicle. [Explanation of Symbols]

[0079] 100...Curtain airbag system, 102...Vehicle, 104...Front seat, 106...Rear seat, 108...A-pillar, 110...B-pillar, 112...C-pillar, 114...Roof side rail, 116, 118...Side window, 124...Airbag cushion, 124a...Outer panel, 124b...Inner panel, 126...Inflator, 128...Inflator mounting section, 130...Tab, 132...Strap, 134...Upper edge, 136...Upper duct section, 138a...First main chamber, 138b...Second main chamber, 138c...Third main chamber, 138d...Fourth main chamber, 138e...Fifth main chamber, 140...Lower chamber, 141...Lower non-inflated area, 142...Tether, 142a...Upper end, 142b...Lower end, 144 ...Tether, 144a...Upper end, 144b...Lower end, 146...Door trim, 148a...First seam, 148b...Second seam, 148c...Third seam, 148d...Fourth seam, 150...Linear seam, 152...Island seam, 154...Front edge, 156...Rear edge, 158...Island seam, 160...Partition seam, 162...Front duct, 164...Rear duct 166... ​​Crew, 168... Head, 172... Upper end, L1... Virtual line, 200... Airbag cushion, 220... Airbag cushion, 240... Airbag cushion, 242... Tether, 242a... Upper end, 242b... Lower end, 260... Airbag cushion, 262... Tether, 262a... Upper end, 262b... Lower end, 264... Lower non-inflatable area, 266... ​​Island seam

Claims

1. A curtain airbag system comprising an airbag cushion that is stored in a long, elongated manner in the front-to-rear direction of the vehicle and is attached to the upper part of the side wall of the passenger compartment, and an inflator that supplies gas to the airbag cushion, The aforementioned airbag cushion is The main chamber expands and unfolds to cover the side window of the vehicle interior side wall, The upper non-expanding region around the main chamber, A lower chamber extending downward from the main chamber, The lower non-expanding region near the lower end of the lower chamber, One or more tethers are provided, which span the upper non-expanding region and the lower non-expanding region, and suspend the lower chamber so that it bends inward relative to the main chamber. It has, The lower chamber is provided such that, with the tether removed and the airbag cushion spread out on a flat surface, it straddles in the vertical direction a virtual line extending in the front-rear direction along the lower edge of the upper non-inflated region. The airbag cushion further has a partition seam provided between the main chamber and the lower chamber so as to extend in the longitudinal direction of the vehicle, The curtain airbag device is characterized in that the partition seam is formed above the imaginary line.

2. The aforementioned upper non-expansion region is, A partitioning section that divides the main chamber into multiple chambers, The upper edge portion near the upper edge of the airbag cushion, Includes, The curtain airbag device according to claim 1, characterized in that the upper ends of the one or more tethers are connected to the partition portion or the upper edge portion.

3. The curtain airbag device according to claim 1 or 2, characterized in that the one or more tethers suspend the lower chamber so as to bend it perpendicularly inward relative to the main chamber.

4. Multiple tethers are provided, The aforementioned multiple tethers A first tether is joined to the vicinity of the leading edge of the lower chamber within the lower non-expanding region, A second tether is joined to the lower non-expanding region near the trailing edge of the lower chamber, A curtain airbag device according to claim 1 or 2, characterized by including the following:

5. In the aforementioned upper non-inflatable region, a seam is formed where the outer panel on the outside of the vehicle and the inner panel on the inside of the vehicle of the airbag cushion are joined. The curtain airbag device according to claim 1 or 2, characterized in that the upper ends of the one or more tethers are joined to predetermined locations in the seam.

6. The aforementioned seam portion has an island seam formed at the tip of a linearly extending portion, which is circular or curved in shape. The curtain airbag device according to claim 5, characterized in that the upper ends of the one or more tethers are joined to the island seam.

7. Multiple tethers are provided, The curtain airbag device according to claim 1 or 2, characterized in that the plurality of tethers are arranged to be parallel to each other.

8. The curtain airbag device according to claim 1, further characterized in that the airbag cushion has one or more duct portions connecting at least one of the front or rear of the lower chamber to the upper main chamber.

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