Curtain airbag, vehicle body, method for manufacturing a curtain airbag, method, occupant restraint device

Abstract

This curtain airbag comprises: a main chamber that extends rearward from the front of a vehicle body-side part; and a rear chamber provided rearward of the main chamber. The curtain airbag is attached to the vehicle body by being rolled up in an upward direction from below and folded, in a state where the rear end of the rear chamber is folded back to abut against one surface of the main chamber. In a case where the airbag is inflated and deployed when a rear-folding angle of a backrest of a rear-row seat attached to the vehicle body is a first angle, the airbag enters a first inflated deployed state, and in a case where the airbag is inflated and deployed when the rear-folding angle of the backrest of the rear-row seat is a second angle smaller than the first angle, the airbag enters a second inflated deployed state.

Description

Technical Field

[0001] This technology relates to a curtain airbag, a vehicle body, a method for manufacturing a curtain airbag, a method, and an occupant restraint device.

Background Art

[0002] In recent years, many vehicles are equipped with an airbag device for the purpose of protecting occupants during a collision. Depending on the vehicle type, a curtain airbag device is equipped. The curtain airbag device includes a curtain airbag folded and stored above the vehicle door and an inflater that operates during a vehicle collision and injects gas into the curtain airbag. The curtain airbag expands and deploys in the vehicle interior by the action of the injection gas of the inflater, and the occupant is received by the expanded and deployed curtain airbag and protected from side collisions to each part in the vehicle interior (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The rear seat provided in a vehicle may have a backrest reclined (reclining). The position of the head of the seated occupant relative to the vehicle body is different between the case where the backrest is reclined and used and the case where it is not reclined and used. The curtain airbag described in Patent Document 1 does not consider the protection of the occupant's head when the reclining angle of the backrest of the rear seat is large.

[0005] This disclosure has been made in view of such circumstances, and an object thereof is to provide a curtain airbag or the like that can protect an occupant in both the case where the reclining angle of the rear seat is large and the case where it is small. [Means for solving the problem]

[0006] A curtain airbag according to one embodiment of the present disclosure comprises a main chamber (13) extending from the front to the rear of the side of the vehicle body (50), and a rear chamber (14) provided behind the main chamber (13), wherein the rear end of the rear chamber (14) is folded back so as to abut one surface of the main chamber (13), and the curtain airbag is rolled up and folded from below to above and attached to the vehicle body (50), and behind the backrest (S1) of the rear row seat (S) attached to the vehicle body (50). When the chamber expands when the tilt angle is at a first angle, the rear chamber (14) expands behind the main chamber (13) to enter the first expanded state. When the chamber expands when the tilt angle of the backrest (S1) of the rear seat (S) is at a second angle which is smaller than the first angle, the main chamber (13) and the rear chamber (14) expand while remaining folded and sandwiched between the side inner wall (5a) of the vehicle body (50) and the rear seat (S), entering the second expanded state.

[0007] In this disclosure, when the rear seats are used with the backrests tilted back significantly (tilted position), the rear chamber of the curtain airbag (airbag) inflates and deploys rearward. This makes it possible to protect occupants seated in the tilted rear seats from shaking caused by impacts from outside the vehicle. When the backrests are used with a small tilt angle (not tilted back), the rear seats prevent the rear chamber, which is folded forward, from expanding and deploying rearward. As a result, a portion of the main chamber and the rear chamber inflate between the rear seats and the side inner wall of the vehicle body, filling the space between the rear seats and the side inner wall of the vehicle body. This makes it possible to protect occupants seated in the rear seats from shaking caused by impacts from outside the vehicle body when the rear seats are not tilted back. In this embodiment, the side inner wall includes the interior wall of the vehicle body, the inner surface of the rear side window glass, and the inner surface of the rear side door (door trim), but may include only some of the aforementioned elements.

[0008] A curtain airbag according to one embodiment of the present disclosure includes a partition (61) that separates the main chamber (13) and the rear chamber (14).

[0009] In this disclosure, the rear chamber is separated from the main chamber by a compartment, so that a large amount of gas is not required, and both the rear chamber and the main chamber can be inflated to an internal pressure sufficient to protect the occupants.

[0010] In one embodiment of the present disclosure, the curtain airbag is provided in the compartment (61) with a vent (61a) through which gas can pass between the inside of the main chamber (13) and the inside of the rear chamber (14).

[0011] In this disclosure, the rear chamber can expand and unfold as gas flows into it through the vent holes.

[0012] In one embodiment of the present disclosure, the curtain airbag inflates and deploys the rear chamber (14) at a position corresponding to the head of an occupant (P) seated in a comfortable position in the rear seat (S) which is tilted backward to a first angle, and enters a first inflated and deployed state.

[0013] In this disclosure, the rear chamber of the curtain airbag inflates and deploys at a position corresponding to the head of an occupant seated in a comfortable position in a reclined rear seat. A comfortable position is a posture in which the occupant leans back with their back against the backrest and their head against the headrest of a reclined rear seat. The position corresponding to the head of an occupant seated in a comfortable position is, for example, the same position as the head of an occupant seated in a comfortable position in the vertical and longitudinal directions relative to the vehicle body. This makes it possible to protect the occupant's head from being swayed from side to side by an impact from outside the vehicle body when the occupant is seated in a comfortable position in the rear seat.

[0014] In one embodiment of the present disclosure, the rear chamber (14) of the curtain airbag (1) is provided with a temporary stitching portion (20) that connects the rear chamber (14) to the main chamber (13) when folded and is ruptured when the rear chamber (14) is deployed to the first inflated state.

[0015] In this disclosure, the temporary stitching connects the folded rear chamber and the main chamber when the curtain airbag is folded. When the curtain airbag inflates and deploys, the temporary stitching delays the inflation and deployment of the rear chamber relative to the main chamber, and the temporary stitching ruptures after the main chamber has inflated, allowing the rear chamber to inflate and deploy. This suppresses oscillation during the inflation and deployment of the rear chamber, making it possible to stably inflate and deploy the curtain airbag.

[0016] A vehicle body according to one embodiment of this disclosure includes the curtain airbag described in claim 1.

[0017] In this disclosure, occupants can be protected by the curtain airbags in both cases, whether the rear-row seats are reclined at a large or small angle.

[0018] A method for manufacturing a curtain airbag according to one embodiment of the present disclosure is a method for manufacturing a curtain airbag (1) that is attached to a vehicle body (50) and inflated and deployed by gas supplied from an inflator (2), wherein a curtain airbag (1) is prepared comprising a main chamber (13) extending from the front to the rear of the side of the vehicle body (50) and a rear chamber (14) provided behind the main chamber (13), the rear end of the rear chamber (14) is folded forward so as to abut one surface of the main chamber (13), and the main chamber (13) and the rear chamber (14) are rolled up and folded from below upward.

[0019] In this disclosure, the curtain airbag is rolled up upward after the rear chamber is folded forward, so the length of the folded curtain airbag in the front-to-rear direction is shorter than the length of the deployed curtain airbag in the front-to-rear direction. This makes it possible to compactly fold a curtain airbag with a rear chamber.

[0020] A method for manufacturing a curtain airbag according to one embodiment of the present disclosure involves connecting the folded rear chamber (14) to the main chamber (13) by a temporary stitching section (20).

[0021] In this disclosure, it is possible to prevent misalignment when the main chamber and the rear chamber are rolled up and folded.

[0022] A method according to one embodiment of the present disclosure provides a curtain airbag (1) comprising a main chamber (13) extending from the front to the rear of the side of the vehicle body (50) and a rear chamber (14) provided behind the main chamber (13), the rear end of the rear chamber (14) is folded forward so as to abut one surface of the main chamber (13), and the main chamber (13) and the rear chamber (14) are rolled up and folded from below upward, thereby reducing the rearward tilt angle of the backrest (S1) of the rear row seat (S) attached to the vehicle body (50). When the curtain airbag (1) inflates and deploys when the angle is a first angle, the rear chamber (14) deploys behind the main chamber (13) to enter a first inflated and deployed state. When the curtain airbag (1) inflates and deploys when the angle of the backrest of the rear seat (S) is a second angle lower than the first angle, the main chamber (13) and the rear chamber (14) remain folded and are sandwiched between the side inner wall (5a) of the vehicle body (50) and the rear seat (S) as they inflate and deploy, entering a second inflated and deployed state. The curtain airbag (1) is attached to the vehicle body (50) in this manner.

[0023] In this disclosure, occupants can be protected by the curtain airbags in both cases, whether the rear-row seats are reclined at a large or small angle.

[0024] An occupant restraint device according to an embodiment of the present disclosure includes a curtain airbag (1) that includes a main chamber (13) extending from the front to the rear of a side portion of a vehicle body (50) and a rear chamber (14) provided behind the main chamber (13), and an occupant restraint device (10) that includes a rear seat (S) attached to the vehicle body (50) and having a reclining backrest (S1). The curtain airbag (1) is wound up and folded from below upward in a state where the rear end of the rear chamber (14) abuts against one surface of the main chamber (13) and is attached to the vehicle body (50). When inflated and deployed when the reclining angle of the backrest (S1) of the rear seat (S) is a first angle, the rear chamber (14) is deployed behind the main chamber (13) to be in a first inflated and deployed state. When inflated and deployed when the reclining angle of the backrest (S1) of the rear seat (S) is a second angle smaller than the first angle, the main chamber (13) and the rear chamber (14) are inflated and deployed while being sandwiched between a side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state to be in a second inflated and deployed state.

[0025] In the present disclosure, the occupant can be protected by the curtain airbag in both cases where the reclining angle of the rear seat is large and small.

Effect of the Invention

[0026] In the curtain airbag according to an embodiment of the present disclosure, the occupant can be protected by the curtain airbag in both cases where the reclining angle of the rear seat is large and small.

Brief Description of the Drawings

[0027] [Figure 1] It is a schematic side view showing the attachment state of the curtain airbag. [Figure 2] It is a schematic left side view showing the deployed airbag. [Figure 3] It is a side view of the airbag explaining the folding method of the airbag. [Figure 4] This is a side view of the airbag, illustrating how to fold it. [Figure 5] This is a side view of the airbag, illustrating how to fold it. [Figure 6] This is a schematic front view of an airbag illustrating how to fold it. [Figure 7] This is a side view showing the crew restraint device in the first inflated and deployed state. [Figure 8] This is a schematic cross-sectional view shown by lines A-A and B-B in Figure 7. [Figure 9] This is a side view showing the crew restraint device in the second expansion and deployment state. [Figure 10] Figure 9 is a schematic cross-sectional view using X-X lines. [Modes for carrying out the invention]

[0028] The following description will be based on drawings showing a curtain airbag 1 according to an embodiment. Figure 1 is a schematic side view showing the installation state of the curtain airbag. The curtain airbag (hereinafter referred to as airbag) 1 is provided on the roof side rail portion 51 of the vehicle body 50 and is covered by a headlining (not shown). The inflator 2 is provided on the roof side rail portion 51. A door trim 52 is provided below the roof side rail portion 51, and a window glass 53 is positioned between the roof side rail portion 51 and the door trim 52. Behind the window glass 53, the vehicle body wall 54 is located. The inflator 2 supplies gas into the airbag 1. In this embodiment, the airbag 1 provided on the right side roof side rail portion 51 of the vehicle body 50 will be described as an example. The door trim 52, window glass 53, and vehicle body wall 54 constitute the side inner wall 5a of the vehicle body.

[0029] Figure 2 is a schematic left side view showing the deployed airbag 1. The airbag 1 is a bag-like object formed by overlapping symmetrical sheet materials. In this embodiment, an example is described in which the airbag 1 is made from two pieces of fabric, such as woven fabric, sewn together into a bag shape, but it may also be manufactured from a single piece of woven fabric that is already woven into a bag shape.

[0030] Multiple fasteners 4 are attached to the upper longitudinal (front-to-back) side of the rectangular airbag 1 at predetermined distances from each other. Multiple tabs 3 corresponding to the fasteners 4 are also provided on the airbag 1 below the fasteners 4. A wrap 3a is further connected to the lower part of the tabs 3. The wrap 3a is rotatable around an axis parallel to the front-to-back direction. The tabs 3, wrap 3a, and fasteners 4 are integrally attached to the base fabric of the airbag 1 by sewing. The tabs 3, wrap 3a, and fasteners 4 are arranged, for example, on the right side of the airbag 1.

[0031] The fastener 4 is provided with an opening 4a. The wrap 3a is wrapped around the wound or folded airbag 1 at least once in the circumferential direction to hold the airbag 1 in a wound or folded state, and is inserted into the opening 4a of the fastener 4 and secured. The airbag 1 is attached to the roof side rail portion 51 of the vehicle body 50 by the fastener 4. A connection portion 5 for connecting to the inflator 2 is also provided at the center in the front-rear direction of the upper edge of the airbag 1. The connection portion 5 protrudes upward from the upper edge of the airbag 1.

[0032] The airbag 1 comprises a front chamber 11, a lower chamber 12, a main chamber 13, and a rear chamber 14. The front chamber 11 is located at the very front of the airbag 1. The lower chamber 12 is located behind the front chamber 11, with a portion of it protruding downwards. The main chamber 13 is located behind the lower chamber 12, and the rear chamber 14 is located even further behind the main chamber 13. The main chamber 13 and the rear chamber 14 are separated by a compartment 61. The compartment 61 is formed by sewing two sheet materials together in the vertical direction. Alternatively, the compartment 61 may be formed by welding two sheet materials together. The upper and lower parts of the compartment 61 are not sewn together and are provided with ventilation holes 61a. That is, the gas supplied from the inflator 2 flows into the rear chamber 14 through the main chamber 13 and the ventilation holes 61a.

[0033] A fold line 14a is formed behind the compartment 61, i.e., in the rear chamber 14. The fold line 14a is approximately parallel to the compartment 61.

[0034] The airbag 1 is provided with a seam 6, which separates the inflatable section 7, including the front chamber 11, lower chamber 12, main chamber 13, and rear chamber 14, from the uninflatable section 8. The uninflatable section 8 includes a portion formed around the periphery of the airbag 1 and a portion that exists independently in the central part. The inflatable section 7 is mainly formed in the central part of the airbag 1 and includes a downward inflatable section 7a provided in the lower chamber 12. When deployed, the downward inflatable section 7a extends below the upper edge of the door trim 52.

[0035] A strap 9 is provided at the front upper part of the airbag 1. The strap 9 is long and slender and extends in the front-to-back direction. The rear end of the strap 9 is attached to the non-inflatable portion 8 at the front edge of the airbag 1. By fixing the front end of the strap 9 to the vehicle body 50, the airbag 1 is pulled in the front-to-back direction, and tension is applied to the airbag 1.

[0036] Next, the method for folding airbag 1 will be explained. Figures 3 to 5 are side views of airbag 1 illustrating the folding method, and Figure 6 is a schematic front view of airbag 1 illustrating the folding method. The front and rear views used in the following explanation correspond to the front-rear direction of the vehicle, and the sides correspond to the left-right direction of the vehicle. As shown in Figures 2 and 6A, in the initial state, airbag 1 is deployed. In the initial state, the gas in each chamber has been released, and the fabric on the left and right sides is in contact internally. In addition, the tab 3, wrap 3a, and airbag 1 are sewn together by the sewing section 31 and formed integrally.

[0037] As shown in Figure 3, the rear chamber 14 is folded forward along the fold line 14a so that it faces the left side of the main chamber 13. Here, "right" refers to the right direction when viewing the front from the rear of the vehicle. "Left" refers to the left direction when viewing the front from the rear of the vehicle.

[0038] In the state shown in Figures 3 and 6B, the rear chamber 14 is temporarily fastened to the main chamber 13. The temporary stitching section 20 connects the rear chamber 14 to the main chamber 13. In this embodiment, the temporary stitching section 20 is formed to be arranged vertically in three places each on the front and rear of the folded rear chamber 14. The temporary stitching section 20 prevents misalignment of the main chamber 13 and the rear chamber 14 with respect to the winding device when the airbag 1 is wound using the winding device. The temporary stitching section 20 is ruptured when the airbag 1 is first inflated and deployed, and the rear chamber 14 deploys rearward.

[0039] As shown in Figures 4 and 6C, the airbag 1 is rolled up to the right side, starting from its lower end. In Figure 4, the dashed line shows the outline of the airbag 1 at the beginning of the roll-up. As shown by the solid line in Figure 4 and in Figure 6C, the airbag 1 is rolled up to the vicinity of the fastener 4 and then folded. The airbag 1 may also be folded in an accordion-like manner from bottom to top.

[0040] As shown in Figures 5 and 6D, the wrap 3a is wrapped around the outer surface of the rolled airbag 1 and attached to the opening 4a of the fastener 4. The airbag 1 is held in a folded state by the tab 3. When attaching the airbag 1 to the vehicle body 50, the fastener 4 secures the rod-shaped airbag 1 to the roof side rail portion 51.

[0041] The inflation and deployment of the airbag 1 will be described below. Figure 7 is a side view showing the occupant restraint device 10 in the first inflation and deployment state. Figure 8 is a schematic cross-sectional view taken along lines A-A and B-B in Figure 7. The airbag 1 is in the first inflation and deployment state when it is deployed when the reclining angle of the backrest S1 of the rear seat S of the vehicle is at the first angle. In this embodiment, the first angle is defined as the maximum reclining angle that the backrest S1 can recline to, and the state in which the backrest S1 is reclined to the first angle is defined as the reclined state. Note that the first angle is not limited to the maximum reclining angle. For example, the first angle may be the reclining angle of the backrest S1 such that, when the occupant restraint device 10 is viewed from the side, the backrest S1 of the rear seat S and the airbag 1 in the inflated and deployed state do not overlap. Furthermore, when the backrest S1 is tilted backward to the first angle, the headrest S2 of the rear seat S and the airbag 1 when inflated and deployed may overlap when the occupant restraint device 10 is viewed from the side. Alternatively, the first angle may be a backrest angle of the backrest S1 such that, when the occupant restraint device 10 is viewed from the side, the headrest S2 of the rear seat S and the airbag 1 when inflated and deployed do not overlap. The first angle may also be a backrest angle of the backrest S1 such that, when the occupant restraint device 10 is viewed from the side, the upper end of the backrest S1 of the rear seat S is located below the lower end of the rear chamber 14 of the airbag 1. In Figure 7 and Figure 9, which will be described later, the rear seat S and occupant P are shown by dashed lines.

[0042] When gas is supplied from the inflator 2 to the airbag 1, the front chamber 11, the lower chamber 12, and the main chamber 13 inflate. Due to the inflation, the wrap 3a detaches from the fastener 4, and the airbag 1 deploys downward, resulting in the state shown in Figure 3. If gas is supplied further from the inflator 2 to the airbag 1, the rear chamber 14 inflates, and the temporary stitching 20 ruptures. Due to the inflation, the rear chamber 14 rotates around the fold line 14a as an axis and deploys rearward, resulting in the first inflated and deployed state.

[0043] Figure 8A is a schematic cross-sectional view taken along line A-A in Figure 7. As shown in Figure 8A, the main chamber 13 of the airbag 1 inflates to the left of the window glass 53. Figure 8B is a schematic cross-sectional view taken along line B-B in Figure 7. As shown in Figure 8B, the rear chamber 14 of the airbag 1 inflates to the left of the vehicle's inner wall 54. The rear chamber 14 may also inflate to the left of the door trim 52 or the window glass 53.

[0044] As shown in Figure 7, when the airbag 1 reaches the first inflation and deployment state, the rear chamber 14 inflates to a position that can protect the head of an occupant P who is seated in a comfortable position in the rear seat S, which is in a reclined position with the backrest S1 tilted backward to a first angle. In this embodiment, a comfortable position refers to a posture in which the occupant leans back with their back against the backrest S1 of the reclined rear seat S and their head against the headrest S2. The rear chamber 14 is provided, for example, to inflate to the same position as the head of an occupant P in the comfortable position in both the vertical and longitudinal directions relative to the vehicle body 50. As a result, in the first inflation and deployment state, the rear chamber 14 can protect the head of an occupant P from swinging from side to side due to an impact from outside the vehicle body when the occupant P is in a comfortable position.

[0045] Figure 9 is a side view showing the occupant restraint device 10 in the second inflated and deployed state. Figure 10 is a schematic cross-sectional view taken along the line X-X in Figure 9. The airbag 1 is in the second inflated and deployed state when it is deployed when the reclining angle of the rear seat S of the vehicle is a second angle, which is smaller than the first angle. In this embodiment, the minimum reclining angle of the backrest S1 (0 degrees) is defined as the second angle, and the state in which the reclining angle of the backrest S1 is the second angle is defined as the non-reclined state. Note that the second angle is not limited to the minimum reclining angle. For example, the second angle may be the reclining angle of the backrest S1 such that, when the occupant restraint device 10 is viewed from the side, the backrest S1 of the rear seat S and the airbag 1 when inflated and deployed overlap. Also, the first angle may be the reclining angle of the backrest S1 such that, when the occupant restraint device 10 is viewed from the side, the headrest S2 of the rear seat S and the airbag 1 when inflated and deployed overlap. The second angle may be the backward tilt angle of the backrest S1 when the occupant restraint device 10 is viewed from the side, and the upper end of the backrest S1 of the rear seat S is located above the lower end of the rear chamber 14 of the airbag 1.

[0046] When gas is supplied from the inflator 2 to the airbag 1, the front chamber 11, the lower chamber 12, and the main chamber 13 inflate in the same way as when the rear seat S is folded back, resulting in the state shown in Figure 3. Furthermore, when gas is supplied from the inflator 2 to the airbag 1, the rear chamber 14 is prevented from rotating around the fold line 14a by the rear seat S and inflates while remaining folded forward in a position sandwiched between the side inner wall 5a of the vehicle body and the rear seat S. In this case, due to the fold line 14a and the compartment 61, the amount of gas flowing into the rear chamber 14 is less than in the first inflated and deployed state.

[0047] As the rear chamber 14 inflates while remaining bent, the airbag 1 fills the gap between the vehicle's inner wall 54 and the rear seat S, as shown in Figure 10. This causes the vehicle's inner wall 54, the airbag 1, and the rear seat S to work together to protect the occupant P seated in the rear seat S when the vehicle is subjected to an impact. The rear chamber 14 may also fill the gap between the door trim 52 or window glass 53 and the rear seat S. In other words, in this embodiment, the side inner wall 5a of the vehicle body including the door trim 52, window glass 53, or vehicle's inner wall 54, the airbag 1, and the rear seat S constitute the occupant restraint device 10.

[0048] With the above configuration, occupants can be protected in both cases, whether the rear-row seat S is tilted back at a large or small angle.

[0049] (modified version) In the above-described embodiment, the airbag 1 was rolled up from bottom to top after the rear chamber 14 was folded forward, but it is not limited to this. The airbag 1 may be rolled up from bottom to top and then folded by folding the rear chamber 14 forward. Alternatively, the airbag 1 may be folded in an accordion-like manner from bottom to top.

[0050] If reference numerals are included in a claim, they are merely provided for reference purposes to facilitate understanding of the claim, corresponding to the reference numerals described in the embodiment, and do not limit the scope of the claim.

[0051] The embodiments disclosed herein should be considered in all respects as illustrative and not restrictive. The technical features described in each embodiment can be combined with one another, and the scope of the present invention is intended to include all modifications within the claims and scopes equivalent to the claims. Furthermore, the independent and dependent claims described in the claims can be combined with one another in any combination, regardless of the form of reference. Moreover, the claims use a multi-claim format in which claims refer to two or more other claims (multi-claim format), but are not limited thereto. They may also be described using a multi-claim format in which at least one multi-claim refers to another multi-claim (multi-multi-claim format). [Explanation of symbols]

[0052] 1. Curtain airbag (airbag) 2 Inflators 3 tabs 3a Wrap 4 Fixtures 4a aperture 5 Connection part 5a Side inner wall 6 seams 7. Expansion section 7a Downward expansion section 8 Non-expansion section 9 straps 10 Crew restraint devices 11 Front Chamber 12 Lower Chamber 13 Main Chamber 14 Rear Chamber 14a Fold line 20. Pre-sewing Department 50 car bodies 51 Roof side rail section 52 Door trim 53 Window glass 54 Inner wall of the vehicle 61 Sections 61a Ventilation holes P Crew S Rear seat S1 Backrest S2 Headrest

Claims

1. The main chamber (13) extends from the front to the rear of the side of the vehicle body (50), A rear chamber (14) is provided behind the main chamber (13) and Equipped with, The rear end of the rear chamber (14) is folded back so that it abuts against one surface of the main chamber (13), and then rolled up and folded from below upwards and attached to the vehicle body (50). When the rear chamber (14) expands and unfolds while the backrest (S1) of the rear seat (S) attached to the vehicle body (50) is at a first tilt angle, the rear chamber (14) unfolds behind the main chamber (13) to enter the first expanded and unfolded state. When the rear seat (S) expands and unfolds while the backward tilt angle of the backrest (S1) of the rear seat (S) is a second angle smaller than the first angle, the main chamber (13) and the rear chamber (14) expand and unfold while remaining folded, sandwiched between the side inner wall (5a) of the vehicle body (50) and the rear seat (S), resulting in a second expanded and unfolded state. Curtain airbag (1).

2. The main chamber (13) and the rear chamber (14) are separated by a partition (61). The curtain airbag (1) according to claim 1.

3. The compartment (61) is provided with a ventilation hole (61a) that allows gas to pass between the inside of the main chamber (13) and the inside of the rear chamber (14). The curtain airbag (1) according to claim 2.

4. The rear chamber (14) expands and unfolds at a position corresponding to the head of the occupant (P) seated in a comfortable position in the rear seat (S) which is tilted backward to the first angle, and enters a first expanded state. The curtain airbag (1) according to claim 1 or 2.

5. The rear chamber (14) of the curtain airbag (1) is provided with a temporary stitching section (20) that connects the rear chamber (14) to the main chamber (13) when folded, and which is ruptured when the rear chamber (14) is deployed to the first inflated state. The curtain airbag (1) according to claim 1 or 2.

6. A vehicle body (50) equipped with a curtain airbag as described in claim 1.

7. A method for manufacturing a curtain airbag (1) which is attached to a vehicle body (50) and inflated and deployed by gas supplied from an inflator (2), A curtain airbag (1) is provided, comprising a main chamber (13) extending from the front to the rear of the side of the vehicle body (50), and a rear chamber (14) provided behind the main chamber (13). The rear end of the rear chamber (14) is folded forward so as to abut one surface of the main chamber (13). The main chamber (13) and the rear chamber (14) are rolled up and folded from below upward. A method for manufacturing a curtain airbag (1).

8. The folded rear chamber (14) is connected to the main chamber (13) by the temporary stitching section (20). A method for manufacturing the curtain airbag (1) according to claim 7.

9. A curtain airbag (1) is provided, comprising a main chamber (13) extending from the front to the rear of the side of the vehicle body (50), and a rear chamber (14) provided behind the main chamber (13). The rear end of the rear chamber (14) is folded forward so as to abut one surface of the main chamber (13). The main chamber (13) and the rear chamber (14) are rolled up and folded from below upward. When the rear chamber (14) expands and unfolds while the backrest (S1) of the rear seat (S) attached to the vehicle body (50) is at a first tilt angle, the rear chamber (14) unfolds behind the main chamber (13) to enter the first expanded and unfolded state. When the rear seat (S) expands and unfolds while the angle of its backrest is lower than the first angle (second angle), the main chamber (13) and the rear chamber (14) expand and unfold while remaining folded, sandwiched between the side inner wall (5a) of the vehicle body (50) and the rear seat (S), resulting in a second expanded and unfolded state. A method for attaching the curtain airbag (1) to the vehicle body (50) as described above.

10. A curtain airbag (1) comprises a main chamber (13) extending from the front to the rear of the side of the vehicle body (50), and a rear chamber (14) provided behind the main chamber (13), A rear seat (S) is attached to the vehicle body (50) and has a backrest (S1) that folds down backward. A crew restraint device (10) comprising, The curtain airbag (1) is The rear end of the rear chamber (14) is folded back so that it abuts against one surface of the main chamber (13), and then rolled up and folded from below upwards and attached to the vehicle body (50). When the rear seat (S) expands and unfolds while the backrest (S1) of the rear seat (S) is tilted backward to a first angle, the rear chamber (14) unfolds behind the main chamber (13) to enter the first expanded and unfolded state. When the rear seat (S) inflates and unfolds while the backward tilt angle of the backrest (S1) of the rear seat (S) is a second angle smaller than the first angle, the main chamber (13) and the rear chamber (14) remain folded and are sandwiched between the side inner wall (5a) of the vehicle body (50) and the rear seat (S) as they inflate and unfold, resulting in a second inflated and unfolded state. Crew restraint device (10).

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