Airbag system

Abstract

This helps to suppress the reduction in protective performance caused by airbags. [Solution] The airbag device comprises a lower chamber positioned at the front of the vehicle and an upper chamber located vertically above the lower chamber and supported by the lower chamber. The lower chamber has a pair of first extending portions that extend along a pair of pillars on the sides of the vehicle's windshield, and a first projection that protrudes outward in the vehicle width direction from the first extending portions and is locked to the side of the pillar when deployed. The upper chamber has a pair of upper chamber extending portions that extend along the pair of pillars, are located vertically above the pair of first extending portions of the lower chamber, and are supported by the pair of first extending portions.

Description

Technical Field

[0006] , ,

[0005] ,

[0007] , ,

[0001] The present invention relates to an airbag device.

Background Art

[0002] Vehicles equipped with an airbag device that deploys in the front of the vehicle are widespread in order to protect the occupants of bicycles, motorcycles, etc., or pedestrians when they collide with bicycles, motorcycles, etc. or pedestrians. The occupants of bicycles, motorcycles, etc. or pedestrians are hereinafter referred to as pedestrians, etc.

[0003] For example, Patent Document 1 discloses an automobile provided with a substantially U-shaped airbag having a base portion that deploys along a cowl top panel and a pair of side portions that deploy along the left and right A-pillars of a windshield.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the prior art such as the technology of Patent Document 1 described above, when the airbag rapidly expands, it may swing greatly and show unstable behavior. For this reason, for example, in the technology of Patent Document 1, there is a risk that the airbag may deviate from the cowl top panel, A-pillar, etc., resulting in insufficient protection for pedestrians, etc.

[0006] In view of such problems, an object of the present invention is to provide an airbag device capable of suppressing a decrease in the protection performance by an airbag.

Means for Solving the Problems

[0007] To solve the above problems, an airbag device according to one embodiment of the present invention is provided. The lower compartment located at the front of the vehicle, An upper chamber located vertically above the lower chamber and supported by the lower chamber, Equipped with, The aforementioned lower chamber is, A pair of first extending portions that extend along a pair of pillars on the side of the windshield of the vehicle, A first projection extends outward in the vehicle width direction from the first extension and is locked to the side surface of the pillar when deployed, It has, The aforementioned upper room is, It has a pair of upper chamber extensions that extend along the pair of pillars, are located vertically above the pair of first extensions of the lower chamber, and are supported by the pair of first extensions. [Effects of the Invention]

[0008] According to the present invention, it is possible to suppress the reduction in protective performance provided by airbags. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram showing the general configuration of an airbag device according to an embodiment of the present invention before deployment. [Figure 2] Figure 2 is a schematic diagram showing the general configuration of the airbag device after deployment according to the same embodiment. [Figure 3] Figure 3 is a schematic diagram showing the general configuration of the lower chamber of the airbag device according to the same embodiment after deployment. [Figure 4] Figure 4 is a cross-sectional view perpendicular to the extension direction of the first extension portion in line IV of Figure 2. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below with reference to the attached drawings. The specific dimensions, materials, numerical values, etc., shown in these embodiments are merely examples 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.

[0011] <1. Airbag System Configuration> First, the configuration of the airbag device 100 according to the embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a schematic diagram showing the general configuration of the airbag device 100 according to the embodiment of the present invention before deployment. Figure 2 is a schematic diagram showing the general configuration of the airbag device 100 according to the embodiment of the present invention after deployment. Figure 3 is a schematic diagram showing the general configuration of the lower chamber 110 of the airbag device 100 according to the embodiment of the present invention after deployment.

[0012] As shown in Figures 1 to 3, the airbag system 100 is installed in the vehicle 10. The airbag system 100 comprises, for example, an airbag 102 and an inflator 104. Before deployment, the airbag system 100 is located in the rear of the engine compartment below the cowl top panel 12 or below the hood 14 in the vehicle 10.

[0013] When a collision with a bicycle, motorcycle, or pedestrian is detected in vehicle 10, gas is supplied from the inflator 104 to the airbag 102. As a result, the airbag 102 deploys from between the cowl top panel 12 and the windshield 16 to the front of vehicle 10 F. The number of inflators 104 is not limited.

[0014] As shown in Figure 2, the airbag 102 comprises a lower chamber 110 and an upper chamber 210. The arrangement, shape, pressure, etc., of the lower chamber 110 and upper chamber 210 during deployment will be described below.

[0015] As shown in FIGS. 2 and 3, the lower chamber 110 is disposed on the front face F of the vehicle 10. The front face F of the vehicle 10 is at least a portion including the windshield 16 of the vehicle 10. The lower chamber 110 has a pair of first extending portions 112a and 112b that extend along a pair of pillars 20A and 20B on the sides of the windshield 16 of the vehicle 10, respectively. The pillars 20A and 20B are also called A-pillars.

[0016] The first extending portion 112a extends along the pillar 20A provided on the right side of the vehicle 10. In the present embodiment, the first extending portion 112a is disposed to straddle from above the windshield 16 to above the pillar 20A. However, the first extending portion 112a only needs to extend along the pillar 20A. For example, it may be disposed on the windshield 16 or on the pillar 20A.

[0017] The first extending portion 112b extends along the pillar 20B provided on the left side of the vehicle 10. In the present embodiment, the first extending portion 112b is disposed to straddle from above the windshield 16 to above the pillar 20B. However, the first extending portion 112b only needs to extend along the pillar 20B. For example, it may be disposed on the windshield 16 or on the pillar 20B.

[0018] A tether for restricting vertical expansion may be provided in the internal space of the first extending portion 112a. In this case, the shape of the cross section orthogonal to the extending direction of the first extending portion 112a is an ellipse having a major axis along the left-right direction of the vehicle. Similarly, a tether for restricting vertical expansion may be provided in the internal space of the first extending portion 112b. In this case, the shape of the cross section orthogonal to the extending direction of the first extending portion 112b is an ellipse having a major axis along the left-right direction of the vehicle.

[0019] Also, in the present embodiment, the lower chamber 110 may further have a second extending portion 114 that connects the front portions of the pair of first extending portions 112a and 112b and extends in the vehicle width direction. The second extending portion 114 extends, for example, along the cowl top panel 12 of the vehicle 10. In the present embodiment, the second extending portion 114 is disposed across the bonnet 14, the cowl top panel 12, and the windshield 16. However, the second extending portion 114 may extend along the cowl top panel 12 and may be disposed, for example, on the bonnet 14, on the cowl top panel 12, or on the windshield 16.

[0020] A tether for restricting vertical expansion may be provided in the internal space of the second extending portion 114. In this case, the shape of the cross section orthogonal to the extending direction of the second extending portion 114 is an ellipse having a major axis along the vehicle front-rear direction.

[0021] Also, in the present embodiment, the lower chamber 110 may have an expansion portion 116a at the connection location between the first extending portion 112a and the second extending portion 114. Similarly, in the present embodiment, the lower chamber 110 may have an expansion portion 116b at the connection location between the first extending portion 112b and the second extending portion 114. The expansion portions 116a and 116b bulge inward in the vehicle width direction and toward the rear of the vehicle when deployed.

[0022] Furthermore, in this embodiment, the lower chamber 110 has protruding portions 120 that project outward in the vehicle width direction from each of the pair of first extending portions 112a and 112b. In this embodiment, the protruding portions 120 are provided at the rear of each of the first extending portions 112a and 112b. Note that there is no limitation on the installation position or number of protruding portions 120, and it is sufficient that at least one protruding portion 120 is provided on each of the first extending portions 112a and 112b. For example, the protruding portions 120 may be provided at the front of each of the first extending portions 112a and 112b, or they may be provided between the front and rear of each of the first extending portions 112a and 112b. Also, the installation positions of the protruding portion 120 provided on the first extending portion 112a and the protruding portion 120 provided on the first extending portion 112b may be different. For example, one projection 120 may be provided at the rear of the first extension 112a, and the other projection 120 may be provided at the front of the first extension 112b. Also, the number of projections 120 provided on the first extension 112a and the number of projections 120 provided on the first extension 112b may be the same or different. Details of the projections 120 will be described later.

[0023] As shown in Figure 2, the upper chamber 210 is located vertically above the lower chamber 110 and is supported by the lower chamber 110. The upper chamber 210 may be configured to deploy with a delay compared to the deployment of the lower chamber 110. The pressure in the upper chamber 210 may be different from or the same as the pressure in the lower chamber 110. The pressures in the lower chamber 110 and the upper chamber 210 are set to pressures that are, for example, above atmospheric pressure and suitable for protecting pedestrians, etc.

[0024] The upper chamber 210 has a pair of upper chamber extensions 212a and 212b. The upper chamber extension 212a is supported by the first extension 112a. The upper chamber extension 212a is located vertically above the first extension 112a. The upper chamber extension 212a is attached, for example, to the first extension 112a of the lower chamber 110 and to the second projection 124 of the projection 120, which will be described later. The upper chamber extension 212a extends along the pillar 20A. In this embodiment, the upper chamber extension 212a is positioned over the pillar 20A from above the windshield 16. However, the upper chamber extension 212a only needs to extend along the pillar 20A and may be positioned, for example, on the windshield 16 or on the pillar 20A. In this embodiment, the length of the upper chamber extension 212a in the vehicle-lateral direction is longer than the length of the first extension 112a in the vehicle-lateral direction. The upper chamber extension 212a protrudes inward in the vehicle width direction compared to the first extension 112a.

[0025] The upper chamber extension 212b is supported by the first extension 112b. The upper chamber extension 212b is located vertically above the first extension 112b. The upper chamber extension 212b is attached, for example, to the first extension 112b of the lower chamber 110 and the second projection 124 of the projection 120. The upper chamber extension 212b extends along the pillar 20B. In this embodiment, the upper chamber extension 212b is positioned over the pillar 20B from above the windshield 16. However, the upper chamber extension 212b only needs to extend along the pillar 20B, and may be positioned, for example, on the windshield 16 or on the pillar 20B. In this embodiment, the length of the upper chamber extension 212b in the vehicle-lateral direction is longer than the length of the first extension 112b in the vehicle-lateral direction. The upper chamber extension portion 212b protrudes inward in the vehicle width direction compared to the first extension portion 112b.

[0026] A tether may be provided in the internal space of the upper chamber extension 212a to restrict vertical expansion. In this case, the shape of the cross-section perpendicular to the extension direction of the upper chamber extension 212a will be an ellipse with a major axis aligned with the left-right direction of the vehicle. Similarly, a tether may be provided in the internal space of the upper chamber extension 212b to restrict vertical expansion. In this case, the shape of the cross-section perpendicular to the extension direction of the upper chamber extension 212b will be an ellipse with a major axis aligned with the left-right direction of the vehicle.

[0027] Furthermore, as shown in Figures 2 and 3, an inlet 114a is formed in the second extension 114 of the lower chamber 110. The inlet 114a is in communication with the inflator 104. In addition, inlets 118 are provided in the first extensions 112a and 112b of the lower chamber 110. The inlet 118 provided in the first extension 112a of the lower chamber 110 is in communication with the upper chamber extension 212a of the upper chamber 210. The inlet 118 provided in the first extension 112b of the lower chamber 110 is in communication with the upper chamber extension 212b of the upper chamber 210.

[0028] Next, with reference to Figure 4, the configuration of the projection 120 provided on the first extension 112b will be described. Note that the projection 120 provided on the first extension 112a has substantially the same configuration as the projection 120 provided on the first extension 112b, so its description will be omitted.

[0029] Figure 4 is a cross-sectional view perpendicular to the extension direction of the first extension portion 112b along line IV in Figure 2. As shown in Figure 4, in this embodiment, the projection portion 120 has a first projection portion 122. The first projection portion 122 protrudes outward from the first extension portion 112b in the vehicle width direction and is locked to the side surface of the pillar 20B when deployed. When the first projection portion 122 is deployed by the inflow of gas from the inflator 104, it presses against the side surface of the pillar 20B. In other words, the pressure of the gas flowing into the first projection portion 122 presses the first projection portion 122 against the side surface of the pillar 20B. As a result, the first projection portion 122 is locked to the side surface of the pillar 20B when deployed. Furthermore, the higher the pressure of the gas flowing into the first projection portion 122, the greater the pressing force of the first projection portion 122 against the side surface of the pillar 20B. Furthermore, the first projection 122 of the projection 120 provided on the first extension 112a protrudes outward in the vehicle width direction from the first extension 112a and is locked to the side surface of the pillar 20A when deployed.

[0030] In this embodiment, the projection 120 may further include a second projection 124 and a third projection 126 in addition to the first projection 122. The second projection 124 protrudes outward in the vehicle width direction from the first extension 112b and is located vertically above the first projection 122. The upper surface 124a of the second projection 124 faces in a direction that is inclined inward in the vehicle width direction with respect to the vertical direction when viewed in the extension direction of the first extension 112b when deployed.

[0031] The third projection 126 protrudes outward in the vehicle width direction from the first extension 112b and is located between the first projection 122 and the second projection 124. The third projection 126 has the function of pushing the first projection 122 downward, that is, towards the side of the pillar 20B. This allows the pillar 20B to be more favorably locked by the first projection 122. The third projection 126 also has the function of pushing the second projection 124 upward. This allows the upper surface 124a of the second projection 124 to be tilted more inward in the vehicle width direction.

[0032] Furthermore, the second protrusion 124 and the third protrusion 126 of the projection 120 provided on the first extension 112a protrude outward in the vehicle width direction from the first extension 112a. In addition, the upper surface 124a of the second protrusion 124 of the projection 120 provided on the first extension 112a faces in a direction that is inclined inward in the vehicle width direction with respect to the vertical direction when viewed in the extension direction of the first extension 112a when deployed.

[0033] <2. Operation of the airbag system> Next, the operation of the airbag device 100 according to this embodiment will be described.

[0034] When a collision with a bicycle, motorcycle, or pedestrian is detected in vehicle 10, the supply of gas from the inflator 104 to the lower chamber 110 through the inlet 114a is initiated. As a result, the second extended portion 114, the first extended portions 112a and 112b, and the protruding portion 120 are deployed in that order. Consequently, the first protruding portion 122 of the lower chamber 110 is locked to the sides of pillars 20A and 20B, the first extended portion 112a of the lower chamber 110 extends along pillar 20A, and the first extended portion 112b of the lower chamber 110 extends along pillar 20B.

[0035] Furthermore, as described above, the upper chamber extension 212a of the upper chamber 210 is in communication with the first extension 112a of the lower chamber 110 through the inlet 118. Similarly, the upper chamber extension 212b of the upper chamber 210 is in communication with the first extension 112b of the lower chamber 110 through the inlet 118. As a result, gas is supplied from the first extension 112a of the lower chamber 110 to the upper chamber extension 212a of the upper chamber 210. In the same way, gas is supplied from the first extension 112b of the lower chamber 110 to the upper chamber extension 212b of the upper chamber 210. This causes the upper chamber extensions 212a and 212b of the upper chamber 210 to unfold.

[0036] <3. Effectiveness of Airbag Systems> Next, the effects of the airbag device 100 according to an embodiment of the present invention will be described.

[0037] The airbag device 100 according to this embodiment comprises a lower chamber 110 positioned on the front surface F of the vehicle 10, and an upper chamber 210 located vertically above the lower chamber 110 and supported by the lower chamber 110. The lower chamber 110 has a pair of first extending portions 112a and 112b that extend along a pair of pillars 20A and 20B on the sides of the windshield 16 of the vehicle 10, and a first projection 122 that protrudes outward in the vehicle width direction from the first extending portions 112a and 112b and is locked to the sides of the pillars 20A and 20B when deployed. The upper chamber 210 has a pair of upper chamber extending portions 212a and 212b that extend along a pair of pillars 20A and 20B, are located vertically above the pair of first extending portions 112a and 112b of the lower chamber 110, and are supported by the pair of first extending portions 112a and 112b.

[0038] Thus, in the airbag device 100 according to this embodiment, the first protrusion 122 of the lower chamber 110 is locked to the sides of the pillars 20A and 20B of the vehicle 10, so that the swinging of the first extended portions 112a and 112b of the lower chamber 110 can be suppressed when deployed. For this reason, the airbag device 100 according to this embodiment can suppress the deviation of the first extended portions 112a and 112b from the pillars 20A and 20B of the vehicle 10. Consequently, the airbag device 100 according to this embodiment can appropriately position the first extended portions 112a and 112b of the lower chamber 110 along the pillars 20A and 20B of the vehicle 10. As a result, the airbag device 100 according to this embodiment can suppress direct contact between pedestrians and the pillars 20A and 20B of the vehicle 10, and can suppress a decrease in the protective performance of the airbag 102.

[0039] Furthermore, in the airbag device 100 according to this embodiment, the upper chamber 210 is supported by the lower chamber 110, whose oscillation is suppressed. Therefore, the airbag device 100 according to this embodiment can also suppress the oscillation of the upper chamber 210 when deployed. Consequently, the airbag device 100 according to this embodiment can appropriately position the upper chamber extensions 212a and 212b of the upper chamber 210 on the pillars 20A and 20B of the vehicle 10. As a result, the airbag device 100 according to this embodiment can further suppress direct contact between pedestrians, etc., and the pillars 20A and 20B of the vehicle 10, thereby suppressing a decrease in the protective performance of the airbag 102. In addition, the airbag device 100 according to this embodiment can suppress the movement of a collided pedestrian, etc., outward in the vehicle width direction of the vehicle 10 from between the upper chamber extensions 212a and 212b of the upper chamber 210. Therefore, the airbag device 100 according to this embodiment can suppress the movement of a collided pedestrian, etc., to another lane. As a result, the airbag device 100 according to this embodiment can suppress secondary damage to pedestrians and others involved in a collision.

[0040] Furthermore, the lower chamber 110 has a second projection 124 that protrudes outward in the vehicle width direction from the first extension portions 112a and 112b and is located vertically above the first projection portion 122. The upper surface 124a of the second projection portion 124 may face in a direction that is inclined inward in the vehicle width direction with respect to the vertical direction when viewed in the extension direction of the first extension portions 112a and 112b when deployed.

[0041] Thus, in the airbag device 100 according to this embodiment, the second protrusion 124 of the lower chamber 110 allows the upper chamber extensions 212a and 212b of the upper chamber 210 to be tilted inward in the vehicle width direction. Therefore, the airbag device 100 according to this embodiment can further suppress the movement of a pedestrian or the like that has been hit outward in the vehicle width direction from between the upper chamber extensions 212a and 212b of the upper chamber 210. Consequently, the airbag device 100 according to this embodiment can further suppress the movement of a pedestrian or the like that has been hit into another lane. As a result, the airbag device 100 according to this embodiment can further suppress secondary damage to a pedestrian or the like that has been hit, and can suitably protect pedestrians and the like.

[0042] Furthermore, the lower chamber 110 may also have a second extending portion 114 that connects the front ends of a pair of first extending portions 112a and 112b and extends in the left-right direction of the vehicle.

[0043] As a result, the airbag device 100 according to this embodiment can suppress direct contact between pedestrians and the cowl top panel 12, and can further protect pedestrians and the like.

[0044] Furthermore, the lower chamber 110 may have expanding portions 116a and 116b at the connection point between the first extending portions 112a and 112b and the second extending portion 114, which expand inward in the vehicle width direction and toward the rear of the vehicle when deployed.

[0045] As a result, in the airbag device 100 according to this embodiment, the inflatable portions 116a and 116b of the lower chamber 110 can pull the rear portions of the first extended portions 112a and 112b inward in the vehicle width direction. Therefore, in the airbag device 100 according to this embodiment, it is possible to suppress the outward movement of the rear portions of the first extended portions 112a and 112b of the lower chamber 110 in the vehicle width direction. For this reason, in the airbag device 100 according to this embodiment, the first extended portions 112a and 112b of the lower chamber 110 can be positioned more appropriately along the pillars 20A and 20B of the vehicle 10.

[0046] Furthermore, the upper chamber 210 may be configured to unfold with a delay compared to the unfolding of the lower chamber 110. This further suppresses the oscillation of the upper chamber 210.

[0047] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these embodiments. It will be obvious to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention.

[0048] For example, in the above embodiment, we took the case where the lower chamber 110 of the airbag device 100 has a second protrusion 124. However, the second protrusion 124 is not an essential component. If the second protrusion 124 is not present, it is preferable that the upper surfaces of the first extended portions 112a and 112b of the lower chamber 110 of the airbag device 100 face in a direction that is inclined inward in the vehicle width direction relative to the vertical direction when viewed in the direction of extension of the first extended portions 112a and 112b during deployment. This allows the upper chamber extended portions 212a and 212b of the upper chamber 210 of the airbag device 100 to be inclined inward in the vehicle width direction.

[0049] Furthermore, in the above embodiment, an example was given in which the lower chamber 110 of the airbag device 100 has a second extension portion 114. However, the second extension portion 114 is not an essential component. If the second extension portion 114 is not present, it is preferable that the upper chamber 210 of the airbag device 100 further has an extension portion that connects the front ends of a pair of upper chamber extension portions 212a and 212b and extends in the left-right direction of the vehicle. This makes it possible to suppress direct contact between pedestrians and the cowl top panel 12 and to suitably protect pedestrians and the like.

[0050] Furthermore, in the above embodiment, an example was given in which the lower chamber 110 of the airbag device 100 has inflatable parts 116a and 116b. However, the inflatable parts 116a and 116b are not essential. If the inflatable parts 116a and 116b are not present, it is preferable that the first extended parts 112a and 112b of the lower chamber 110 of the airbag device 100 be configured such that when deployed, the rear portions of the first extended parts 112a and 112b are positioned inward in the vehicle width direction.

[0051] Furthermore, in the above embodiment, an example was given in which the upper chamber 210 is configured to unfold with a delay compared to the unfolding of the lower chamber 110. However, the upper chamber 210 may be configured to unfold at the same time as the lower chamber 110. Also, the lower chamber 110 may be configured to unfold with a delay compared to the unfolding of the upper chamber 210.

[0052] Furthermore, in the above embodiment, an example was given in which the protrusion 120 of the lower chamber 110 has a first protrusion 122, a second protrusion 124, and a third protrusion 126. However, the third protrusion 126 is not an essential component. In other words, the protrusion 120 of the lower chamber 110 only needs to have at least a first protrusion 122, and it is preferable that it further has a second protrusion 124. Also, the protrusion 120 of the lower chamber 110 may have a plurality of third protrusions 126 between the first protrusion 122 and the second protrusion 124.

[0053] Furthermore, in the above embodiment, the case in which the lower chamber 110 and the upper chamber 210 are in communication through the inlet 118 was given as an example. However, the lower chamber 110 and the upper chamber 210 do not have to be in communication. For example, a first inflator 104 that supplies gas to the lower chamber 110 and a second inflator 104 that supplies gas to the upper chamber 210 may be provided, and the first inflator 104 may be operated first, and then the second inflator 104 may be operated. [Explanation of Symbols]

[0054] F front 10 vehicles 100 Airbag System 110 Lower room 112a, Section 1, Extended 112b, Section 1, Extended 114, Section 2, Extended 116a Expansion section 116b Expansion 122 First protrusion 124 Second salient 124a above 20ピラー 20B ピラー 210 Upper Room 212a Upper Chamber Extended in Part 212b Upper Room Extended into the Department

Claims

1. The lower compartment located at the front of the vehicle, An upper chamber located vertically above the lower chamber and supported by the lower chamber, Equipped with, The aforementioned lower chamber is, A pair of first extending portions that extend along a pair of pillars on the side of the windshield of the vehicle, A first projection extends outward in the vehicle width direction from the first extension and is locked to the side surface of the pillar when deployed, It has, The aforementioned upper room is, An airbag device having a pair of upper chamber extending portions that each extend along the pair of pillars, are located vertically above the pair of first extending portions of the lower chamber, and are each supported by the pair of first extending portions.

2. The lower chamber has a second projection that protrudes outward in the vehicle width direction from the first extending portion and is located vertically above the first projection. The airbag device according to claim 1, wherein the upper surface of the second projection faces in a direction that is inclined inward in the vehicle width direction with respect to the vertical direction when viewed in the extending direction of the first extension when deployed.

3. The airbag device according to claim 1 or 2, wherein the lower chamber further has a second extending portion that connects the front portions of the pair of first extending portions and extends in the left-right direction of the vehicle.

4. The airbag device according to claim 3, wherein the lower chamber has an inflatable portion at the connection point between the first extended portion and the second extended portion that expands inward in the vehicle width direction and toward the rear of the vehicle when deployed.

5. The airbag device according to claim 1 or 2, wherein the upper chamber is configured to deploy with a delay compared to the deployment of the lower chamber.

Images