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

Abstract

A curtain airbag is provided with: a main chamber extending rearward from the front of a vehicle body side section; and a rear chamber provided to the rear of the main chamber, the rear chamber being attached to the vehicle body by being rolled up and folded upward from below in a state in which the rear end of the rear chamber is folded back so as to come into contact with one surface of the main chamber, and the rear chamber being attached to the vehicle body by being folded back in a state in which the rear end of the rear chamber comes into contact with the one surface of the main chamber. When the backrest of the rear-row seat mounted on the vehicle body is expanded and expanded at a first angle, the vehicle body is in a first expanded and expanded state, and when the backrest of the rear-row seat is expanded and expanded at a second angle smaller than the first angle, the vehicle body is in a second expanded and expanded state. And a second expanded state.

Description

Technical Field

[0001] The present invention relates to a curtain airbag, a vehicle body, a method for manufacturing the curtain airbag, a method, and an occupant restraint device. Background Art

[0002] In recent years, many vehicles have been equipped with airbag systems to protect occupants in the event of a collision. Some models are equipped with curtain airbag systems. These systems consist of a curtain airbag that is folded and stored above the vehicle's door, and an inflator that activates during a vehicle collision and injects gas into the curtain airbag. The inflator's injected gas inflates and deploys within the vehicle's interior, shielding the occupants from side impacts that could impact the interior of the vehicle (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-22918 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Vehicles are equipped with rear seats that can recline their backrests. The position of a seated occupant's head relative to the vehicle body differs between when the backrest is reclined and when it is not. The curtain airbag described in Patent Document 1 does not consider protecting the occupant's head when the rear seat backrest is tilted rearward at a large angle.

[0008] The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a curtain airbag or the like that can protect occupants regardless of whether the rear seat tilts rearward at a large angle or a small angle.

[0009] Solutions to the Problem

[0010] The 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 portion of the vehicle body (50); and a rear chamber (14) arranged behind the main chamber (13), wherein the rear end of the rear chamber (14) is folded back in contact with one side of the main chamber (13) and is rolled up and folded from the bottom to the top and mounted on the vehicle body (50), and is mounted on the vehicle body (50) when the backrest (S1) of the rear seat (S) mounted on the vehicle body (50) is tilted backward. When the tilting angle is a first angle, the rear chamber (14) expands and unfolds to the rear of the main chamber (13), becoming a first expanded and unfolded state. When the rearward tilting 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 clamped by the side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state and expand and unfold, becoming a second expanded and unfolded state.

[0011] In the present disclosure, when the rear seat is used with the backrest tilted backward at a large angle (rearward tilted state), the rear chamber of the curtain airbag (airbag) expands and deploys rearward. This protects passengers seated on the rear seat in the rearward tilted state from swinging due to impacts from outside the vehicle body. In addition, when the rear seat is used with the backrest tilted backward at a small angle (non-rearward tilted state), the rear seat prevents the rear chamber, which is bent forward, from expanding and deploying rearward due to expansion. This causes a portion of the main chamber and the rear chamber to expand between the rear seat and the side inner wall of the vehicle body, filling the space between the rear seat and the side inner wall of the vehicle body. This protects passengers seated on the rear seat in the non-rearward tilted state from swinging due to impacts from outside the vehicle body. In this embodiment, the side inner wall includes the vehicle body inner wall, the inner surface of the window glass on the rear side, and the inner surface of the rear side door (door trim), but may include only some of the above elements.

[0012] A curtain airbag according to one embodiment of the present disclosure includes a partition portion (61) that partitions the main chamber (13) and the rear chamber (14).

[0013] In the present disclosure, the rear chamber is divided from the main chamber by the dividing portion, and the rear chamber and the main chamber can be inflated at an internal pressure sufficient to protect the occupants without requiring a large amount of gas.

[0014] A curtain airbag according to one embodiment of the present disclosure is provided with a vent hole (61a) in the dividing portion (61) that allows gas to pass between the interior of the main chamber (13) and the interior of the rear chamber (14).

[0015] In the present disclosure, gas passes through the vent holes and flows into the rear chamber, so that the rear chamber can be expanded and deployed.

[0016] In a curtain airbag according to one embodiment of the present disclosure, the rear chamber (14) is inflated and deployed at a position corresponding to the head of an occupant (P) seated in a comfortable posture on a rear seat (S) tilted rearward at the first angle, thereby achieving a first inflated and deployed state.

[0017] In the present 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 posture on a rear seat that has been tilted backward. The comfortable posture is a posture in which the back is resting against the backrest of the rear seat that has been tilted backward and the head is resting against the headrest. The position corresponding to the head of an occupant seated in a comfortable posture is, for example, the same position as the head of the occupant seated in a comfortable posture in the up-down direction and the front-back direction relative to the vehicle body. Thus, when an occupant is seated in a comfortable posture on the rear seat, the occupant's head can be protected from swinging left and right due to an impact from outside the vehicle body.

[0018] In a curtain airbag according to one embodiment of the present disclosure, a temporary sewing portion (20) is provided in the rear chamber (14) of the curtain airbag (1), which connects the rear chamber (14) to the main chamber (13) in a folded state and is broken when the rear chamber (14) is expanded to the first expanded and expanded state.

[0019] In the present disclosure, a temporary sewn portion connects the folded rear chamber to the main chamber when the curtain airbag is folded. During the curtain airbag's inflated deployment, the temporary sewn portion delays the expansion and deployment of the rear chamber relative to the main chamber. After the main chamber inflates, the temporary sewn portion breaks, allowing the rear chamber to inflate and deploy. This suppresses swinging of the rear chamber during expansion and deployment, ensuring stable inflation and deployment of the curtain airbag.

[0020] A vehicle body according to one embodiment of the present disclosure includes the curtain airbag according to claim 1 .

[0021] In the present disclosure, the occupants can be protected by the curtain airbag in both cases where the rear seat tilts backward at a large angle and a small angle.

[0022] A method for manufacturing a curtain airbag according to one embodiment of the present invention is a method for manufacturing a curtain airbag (1) that is installed on a vehicle body (50) and inflated and deployed using gas supplied from an inflator (2), wherein a curtain airbag (1) is prepared, the 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) disposed behind the main chamber (13), wherein the rear end of the rear chamber (14) is folded forward in contact with a surface of the main chamber (13), and the main chamber (13) and the rear chamber (14) are rolled up and folded from the bottom to the top.

[0023] In the present disclosure, the rear curtain airbag is rolled up after the rear chamber is folded forward. Therefore, the front-to-back length of the folded curtain airbag is shorter than the front-to-back length of the deployed curtain airbag. This allows the curtain airbag equipped with the rear chamber to be folded compactly.

[0024] In a method for manufacturing a curtain airbag according to one embodiment of the present disclosure, the folded-back rear chamber (14) is connected to the main chamber (13) through a temporary sewing portion (20).

[0025] In the present disclosure, positional deviation when the main chamber and the rear chamber are rolled and folded can be prevented.

[0026] A method according to one embodiment of the present invention comprises preparing a curtain airbag (1), wherein the curtain airbag (1) comprises: 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) arranged behind the main chamber (13). The rear end of the rear chamber (14) is folded forward in a manner abutting against a surface of the main chamber (13). The main chamber (13) and the rear chamber (14) are rolled up and folded from the bottom to the top, and the curtain airbag (1) is provided in the direction of the backrest (S1) of a rear seat (S) installed on the vehicle body (50). When the rear tilt angle is a first angle and the airbag is expanded and deployed, the rear chamber (14) is expanded to the rear of the main chamber (13) to become a first expanded and deployed state. When the angle of the backrest of the rear seat (S) is a second angle lower than the first angle and the airbag is expanded and deployed, the main chamber (13) and the rear chamber (14) are clamped by the side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state and expanded and deployed, and the curtain airbag (1) is installed on the vehicle body (50) to become a second expanded and deployed state.

[0027] In the present disclosure, the occupants can be protected by the curtain airbag regardless of whether the rear seat tilts backward at a large angle or a small angle.

[0028] An embodiment of the present invention relates to an occupant restraint device (10), which comprises: a curtain airbag (1), which comprises 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) arranged behind the main chamber (13); a rear seat (S), which comprises a backrest (S1) installed on the vehicle body (50) and tilted backward, wherein the curtain airbag (1) is rolled up and folded from the bottom to the top and installed on the vehicle body (50) in a state where the rear end of the rear chamber (14) is folded back in contact with a surface of the main chamber (13). 0), and when the rearward tilting angle of the backrest (S1) of the rear seat (S) is a first angle, the rear chamber (14) is expanded and expanded to the rear of the main chamber (13), becoming a first expanded and expanded state; when the rearward tilting 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 clamped by the side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state and expanded and expanded, becoming a second expanded and expanded state.

[0029] In the present disclosure, the occupants can be protected by the curtain airbag in both cases where the rear seat tilts backward at a large angle and a small angle.

[0030] Effects of the Invention

[0031] In the curtain airbag according to one embodiment of the present disclosure, the occupant can be protected by the curtain airbag regardless of whether the rear seat tilts backward at a large angle or a small angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic side view showing a mounted state of the curtain airbag.

[0033] Figure 2 is a schematic left side view showing a deployed airbag.

[0034] Figure 3 This is a side view of the airbag to illustrate how to fold the airbag.

[0035] Figure 4 This is a side view of the airbag to illustrate how to fold the airbag.

[0036] Figure 5 This is a side view of the airbag to illustrate how to fold the airbag.

[0037] Figure 6This is a schematic front side view of the airbag for explaining the method of folding the airbag.

[0038] Figure 7 is a side view showing the occupant restraint device in a first inflated and deployed state.

[0039] Figure 8 It is along Figure 7 Schematic diagram of the cross section of line AA and line BB.

[0040] Figure 9 is a side view showing the occupant restraint device in a second inflated and deployed state.

[0041] Figure 10 It is along Figure 9 Schematic diagram of the cross section of line XX in FIG. DETAILED DESCRIPTION

[0042] Hereinafter, a curtain airbag 1 according to an embodiment will be described with reference to the drawings. Figure 1 : is a schematic side view showing the installation state of the curtain airbag. The curtain airbag (hereinafter referred to as the airbag) 1 is provided on the roof side rail portion 51 of the vehicle body 50 and is covered by the roof interior (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 arranged between the roof side rail portion 51 and the door trim 52. In addition, the vehicle body inner wall 54 is located behind the window glass 53. The inflator 2 supplies gas to the airbag 1. In this embodiment, the airbag 1 provided on the roof side rail portion 51 on the right side of the vehicle body 50 is used as an example for description. The door trim 52, the window glass 53 and the vehicle body inner wall 54 constitute the side inner wall 5a of the vehicle body.

[0043] Figure 2 This is a schematic left side view of the deployed airbag 1. The airbag 1 is a bag-shaped article formed by overlapping symmetrically shaped sheet materials. While this embodiment describes an example of an airbag 1 constructed from two pieces of fabric, such as fabric, sewn together to form a bag shape, the airbag 1 can also be manufactured from a single piece of fabric woven into a bag shape from the outset.

[0044] A plurality of fixing members 4 are provided protruding from the upper side of the rectangular airbag 1 in the longitudinal direction (front-to-back direction) at predetermined intervals. Furthermore, a plurality of tabs 3 corresponding to the fixing members 4 are provided on the airbag 1 below the fixing members 4. A wrapping material 3a is also connected to the lower portion of the tabs 3. The wrapping material 3a is rotatable about an axis parallel to the front-to-back direction. The tabs 3, wrapping material 3a, and fixing members 4 are integrally sewn together on the base fabric of the airbag 1. The tabs 3, wrapping material 3a, and fixing members 4 are, for example, arranged on the right surface of the airbag 1.

[0045] The fixing member 4 has an opening 4a. To maintain the rolled or folded state of the airbag 1, the wrapping material 3a wraps the rolled or folded airbag 1 at least once circumferentially and is inserted into and locked in the opening 4a of the fixing member 4. The airbag 1 is mounted to the roof side rails 51 of the vehicle body 50 via the fixing member 4. Furthermore, a connecting portion 5 for connecting to the inflator 2 is provided at the center of the upper edge of the airbag 1 in the front-to-back direction. The connecting portion 5 protrudes upward from the upper edge of the airbag 1.

[0046] The airbag 1 includes 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 frontmost portion of the airbag 1. The lower chamber 12 is located behind the front chamber 11, with a portion protruding downward. The main chamber 13 is located behind the lower chamber 12, and the rear chamber 14 is located further behind the main chamber 13. The main chamber 13 and the rear chamber 14 are divided by a partition 61. The partition 61 is formed by sewing two left and right sheets of material in the vertical direction. Alternatively, the partition 61 can be formed by hot-melt-connecting the left and right sheets of material. The top and bottom of the partition 61 are not sewn, but are provided with vent holes 61a. That is, the gas supplied from the inflator 2 flows into the rear chamber 14 through the main chamber 13 and the vent holes 61a.

[0047] A fold line 14 a is formed in the rear chamber 14 behind the partition 61 . The fold line 14 a is substantially parallel to the partition 61 .

[0048] Airbag 1 is provided with a seam 6 that separates an inflatable portion 7, which includes a front chamber 11, a lower chamber 12, a main chamber 13, and a rear chamber 14, from a non-inflatable portion 8. The non-inflatable portion 8 includes a portion formed around the periphery of the airbag 1 and a separate portion located in the center. The inflatable portion 7 is primarily formed in the center of the airbag 1 and includes a lower inflatable portion 7a provided above the lower chamber 12. During deployment, the lower inflatable portion 7a extends below the upper edge of the door trim 52.

[0049] A strap 9 is provided at the front upper portion of the airbag 1. The strap 9 is elongated and extends in the front-to-back direction. The rear end of the strap 9 is attached to the non-expanding portion 8 at the front edge of the airbag 1. By securing the front end of the strap 9 to the vehicle body 50, the airbag 1 is stretched in the front-to-back direction, applying tension to the airbag 1.

[0050] Next, a method of folding the airbag 1 will be described. Figures 3 to 5 is a side view of the airbag 1 for explaining a method of folding the airbag 1. Figure 6Schematic front and side views of the airbag 1 for explaining the folding method of the airbag 1. In the following description, the front and rear correspond to the front and rear directions of the vehicle, and the side corresponds to the left and right directions of the vehicle. Figure 2 and Figure 6 As shown in Figure A, in the initial state, the airbag 1 is deployed. Furthermore, in the initial state, the gas in each chamber is exhausted, and the left and right side fabrics are in contact with each other. Furthermore, the tab 3, the wrapping material 3a, and the airbag 1 are sewn together by the sewing section 31 to form an integral unit.

[0051] like Figure 3 As shown, the rear chamber 14 is folded forward along the fold line 14a so that the rear chamber 14 faces the left side of the main chamber 13. Here, "right" refers to the right direction when looking forward from the rear of the vehicle. "Left" refers to the left direction when looking forward from the rear of the vehicle.

[0052] exist Figure 3 and Figure 6 In the state shown in B, the rear chamber 14 is temporarily fixed to the main chamber 13. The temporary sewing portion 20 connects the rear chamber 14 to the main chamber 13. In this embodiment, the temporary sewing portion 20 is formed to be arranged in three locations, one above the other, at the front and the other at the rear of the rear chamber 14 in the folded-back state. The temporary sewing portion 20 prevents the main chamber 13 and the rear chamber 14 from being displaced relative to the winding device when the airbag 1 is wound using the winding device. The temporary sewing portion 20 breaks during the first expansion and deployment of the airbag 1, and the rear chamber 14 deploys rearward.

[0053] like Figure 4 and Figure 6 As shown in C, the airbag 1 starts to roll from the lower end and rolls to the right. Figure 4 In FIG, the double-dashed line represents the outline of the airbag 1 at the start of winding. Figure 4 The solid line and Figure 6 As shown in C, the airbag 1 is rolled up and folded near the fixing member 4. Alternatively, the airbag 1 may be folded from bottom to top in a bellows shape.

[0054] like Figure 5 and Figure 6 As shown in FIG. 2 , the wrapping material 3 a is wrapped around the outer peripheral surface of the rolled airbag 1 and attached to the opening 4 a of the fixing member 4. The airbag 1 is held in a folded state by the tab 3. When the airbag 1 is attached to the vehicle body 50, the rod-shaped airbag 1 is fixed to the roof side rail 51 by the fixing member 4.

[0055] Next, the inflation and deployment of the airbag 1 will be described. Figure 7 1 is a side view showing the occupant restraint device 10 in the first inflated and deployed state. Figure 8 It is along Figure 7 Schematic cross-sectional view of lines AA and BB in FIG. When the airbag 1 is deployed at a first angle at which the backrest S1 of the rear seat S provided in the vehicle is tilted backward, the airbag 1 enters a first inflated and deployed state. In this embodiment, the maximum rearward tilting angle at which the backrest S1 can tilt backward is set as the first angle, and the state in which the backrest S1 is tilted backward at the first angle is set as the rearward tilting state. Furthermore, the first angle is not limited to the maximum rearward tilting angle. For example, the first angle may be a rearward tilting angle of the backrest S1 such that the backrest S1 of the rear seat S does not overlap with the inflated and deployed airbag 1 when viewed from the side of the occupant restraint device 10. Furthermore, when the rearward tilting angle of the backrest S1 is the first angle, the headrest S2 of the rear seat S may overlap with the inflated and deployed airbag 1 when viewed from the side of the occupant restraint device 10. Alternatively, the first angle may be the rearward tilting angle of the backrest S1 when the headrest S2 of the rear seat S does not overlap with the inflated and deployed airbag 1 when the occupant restraint device 10 is viewed from the side. Alternatively, the first angle may be the rearward tilting angle of the backrest S1 when 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 when the occupant restraint device 10 is viewed from the side. Figure 7 and the following Figure 9 In FIG, the rear seat S and the passenger P are indicated by dotted lines.

[0056] 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 expand. Due to the expansion, the wrapping material 3a is separated from the fixing member 4, and the airbag 1 is deployed downward. Figure 3 When gas is supplied from the inflator 2 to the airbag 1, the rear chamber 14 expands and the temporary sewn portion 20 breaks. As the rear chamber 14 expands, it rotates about the fold line 14a and expands rearward, thus entering the first expanded and deployed state.

[0057] Figure 8 A is along Figure 7 Schematic diagram of the cross section of line AA in FIG. Figure 8 As shown in A, the main chamber 13 of the airbag 1 is inflated to the left of the window glass 53 . Figure 8 B is along Figure 7 Schematic diagram of the cross section of line BB in FIG. Figure 8 As shown in B, the rear chamber 14 of the airbag 1 is inflated to the left of the vehicle body inner wall 54. Alternatively, the rear chamber 14 may be inflated to the left of the door trim 52 or the window glass 53.

[0058] like Figure 7As shown, when the airbag 1 is in the first inflated and deployed state, the rear chamber 14 inflates to a position suitable for protecting the head of an occupant P seated in a comfortable position on the rear seat S with the backrest S1 tilted rearward at a first angle. In this embodiment, the "comfortable position" refers to a position in which the back rests against the backrest S1 of the rear seat S tilted rearward and the head rests against the headrest S2. The rear chamber 14 is configured to inflate at the same position relative to the vehicle body 50 in the vertical and longitudinal directions as the head of the occupant P in the comfortable position. Thus, when the occupant P is in the comfortable position, the rear chamber 14 in the first inflated and deployed state can protect the occupant P's head from swinging left and right due to an impact from outside the vehicle body.

[0059] Figure 9 1 is a side view showing the occupant restraint device 10 in the second inflated and deployed state. Figure 10 It is along Figure 9 Schematic cross-sectional view of line XX in FIG. The airbag 1 is deployed when the rear seat S of the vehicle is tilted backward at a second angle smaller than the first angle, at which time it is in a second inflated and deployed state. In this embodiment, the minimum rearward tilting angle (0 degrees) of the backrest S1 is set as the second angle, and the state in which the rearward tilting angle of the backrest S1 is the second angle is set as the non-rearward tilting state. In addition, the second angle is not limited to the minimum rearward tilting angle. For example, the second angle may be a rearward tilting angle of the backrest S1 such that the backrest S1 of the rear seat S overlaps with the inflated and deployed airbag 1 when the occupant restraint device 10 is viewed from the side. In addition, the first angle may be a rearward tilting angle of the backrest S1 such that the headrest S2 of the rear seat S overlaps with the inflated and deployed airbag 1 when the occupant restraint device 10 is viewed from the side. The second angle may be a rearward tilting angle of the backrest S1 when 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 when the occupant restraint apparatus 10 is viewed from the side.

[0060] 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 expand to form a similar situation as when the rear seat S falls backward. Figure 3 The state shown. Furthermore, when gas is supplied from the inflator 2 to the airbag 1, the rear chamber 14 is prevented from rotating about the fold line 14a by the rear seat S, and expands forward in a curved state at a position sandwiched between the side inner wall 5a of the vehicle body and the rear seat S. At this time, the amount of gas flowing into the rear chamber 14 via the fold line 14a and the partition 61 is less than that in the first inflated and deployed state.

[0061] By expanding the rear chamber 14 in a bent state, the airbag 1 is Figure 10 As shown, the rear chamber 14 fills the gap between the vehicle body inner wall 54 and the rear seat S. Thus, the vehicle body inner wall 54, the airbag 1, and the rear seat S function as a single unit, protecting the occupant P seated in the rear seat S in the event of a vehicle body impact. Alternatively, the rear chamber 14 may fill the gap between the door trim 52 or the window glass 53 and the rear seat S. Specifically, in this embodiment, the vehicle body side inner wall 5a, including the door trim 52, the window glass 53, or the vehicle body inner wall 54, the airbag 1, and the rear seat S constitute the occupant restraint device 10.

[0062] According to the above configuration, the occupant can be protected regardless of whether the rearward tilt angle of the rear seat S is large or small.

[0063] (Variation)

[0064] In the above embodiment, the airbag 1 is rolled up from the bottom after the rear chamber 14 is folded forward, but the present invention is not limited thereto. The airbag 1 may be rolled up from the bottom and then the rear chamber 14 is folded forward to be folded. Alternatively, the airbag 1 may be folded from the bottom to the top in a bellows shape.

[0065] In addition, when symbols are described in the claims, these symbols are merely for facilitating understanding of the claims and are added as references corresponding to the symbols described in the embodiments, and do not limit the scope of the claims.

[0066] It should be understood that the embodiments disclosed herein are illustrative in all respects and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all changes in the claims and the scope equivalent to the claims. In addition, the independent claims and dependent claims described in the claims can be combined with each other in all combinations regardless of the form of reference. Moreover, the claim recording form (multiple claim form) that references more than two other claims is used in the claims, but it is not limited to this. It can also be recorded in the form of multiple claims (multiple multiple claims) that reference at least one multiple claim.

[0067] Explanation of symbols

[0068] 1…Curtain airbag (airbag)

[0069] 2…Aerator

[0070] 3…Splice

[0071] 3a…wrapping material

[0072] 4…Fixtures

[0073] 4a…Opening

[0074] 5…Connection

[0075] 5a…side inner wall

[0076] 6…Seams

[0077] 7…Expansion

[0078] 7a…lower expansion part

[0079] 8…Non-expansion part

[0080] 9…Drawstring

[0081] 10…Occupant restraints

[0082] 11…Front chamber

[0083] 12…lower chamber

[0084] 13…main chamber

[0085] 14…Rear chamber

[0086] 14a…broken line

[0087] 20…Temporary sewing department

[0088] 50…Body

[0089] 51…Roof side rails

[0090] 52…Door trim

[0091] 53…car window glass

[0092] 54…Inner wall of the vehicle body

[0093] 61…Division

[0094] 61a…Ventilation hole

[0095] P…Crew

[0096] S…Rear seats

[0097] S1…backrest

[0098] S2…Headrest

Claims

1. A curtain airbag (1), comprising: a main chamber (13) extending from the front to the rear of the side portion of the vehicle body (50); a rear chamber (14) disposed behind the main chamber (13), The rear end of the rear chamber (14) is folded back in contact with one surface of the main chamber (13), and is rolled up and folded from the bottom to the top and mounted on the vehicle body (50). When the backrest (S1) of the rear seat (S) mounted on the vehicle body (50) is tilted backward at a first angle and expanded and deployed, the rear chamber (14) is expanded toward the rear of the main chamber (13) to become a first expanded and deployed state. When the backrest (S1) of the rear seat (S) is tilted backward to a second angle smaller than the first angle and expands and unfolds, the main chamber (13) and the rear chamber (14) are clamped by the side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state and expand and unfold, thus becoming a second expanded and unfolded state.

2. The curtain airbag (1) according to claim 1, further comprising a partition (61) that partitions the main chamber (13) and the rear chamber (14).

3. The curtain airbag (1) according to claim 2, wherein: A vent hole (61a) is provided in the partition portion (61) to allow gas to pass between the interior of the main chamber (13) and the interior of the rear chamber (14).

4. The curtain airbag (1) according to claim 1 or 2, wherein: The rear chamber (14) is inflated and deployed at a position corresponding to the head of an occupant (P) sitting in a comfortable posture on the rear seat (S) tilted backward at the first angle, and is brought into a first inflated and deployed state.

5. The curtain airbag (1) according to claim 1 or 2, wherein: The rear chamber (14) of the curtain airbag (1) is provided with a temporary sewing portion (20), which connects the rear chamber (14) to the main chamber (13) in a folded state and is broken when the rear chamber (14) is unfolded into the first inflated and unfolded state.

6. A vehicle body (50) provided with the curtain airbag according to claim 1.

7. A method for manufacturing a curtain airbag (1), wherein the curtain airbag (1) is mounted on a vehicle body (50) and is inflated and deployed using gas supplied from an inflator (2). A curtain airbag (1) is prepared, comprising: a main chamber (13) extending from the front to the rear of the side portion of the vehicle body (50); and a rear chamber (14) disposed behind the main chamber (13). The rear end of the rear chamber (14) is folded forward so as to abut against one surface of the main chamber (13). The main chamber (13) and the rear chamber (14) are rolled up and folded from the bottom to the top.

8. The method for manufacturing a curtain airbag (1) according to claim 7, wherein: The folded back rear chamber (14) is connected to the main chamber (13) through a temporary sewing portion (20).

9. A method for installing the curtain airbag (1) on the vehicle body (50), A curtain airbag (1) is prepared, comprising: 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) disposed behind the main chamber (13). The rear end of the rear chamber (14) is folded forward so as to abut against one surface of the main chamber (13). The main chamber (13) and the rear chamber (14) are rolled up and folded from the bottom to the top, When the backrest (S1) of the rear seat (S) installed on the vehicle body (50) is expanded and deployed at a rearward tilting angle of a first angle, the rear chamber (14) is expanded to the rear of the main chamber (13) to become a first expanded and deployed state. When the backrest of the rear seat (S) is expanded and unfolded at a second angle lower than the first angle, the main chamber (13) and the rear chamber (14) are clamped by the side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state and expand and unfold to a second expanded and unfolded state.

10. An occupant restraint device (10), comprising: A curtain airbag (1) comprises 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) arranged behind the main chamber (13); A rear seat (S) having a backrest (S1) mounted on the vehicle body (50) and tilted backward, in, The curtain airbag (1), The rear end of the rear chamber (14) is folded back in contact with one surface of the main chamber (13), and is rolled up and folded from the bottom to the top and mounted on the vehicle body (50). When the backrest (S1) of the rear seat (S) is expanded and deployed at a first tilting angle, the rear chamber (14) is expanded to the rear of the main chamber (13) to become a first expanded and deployed state. When the backrest (S1) of the rear seat (S) is tilted backward to a second angle smaller than the first angle and expands and unfolds, the main chamber (13) and the rear chamber (14) are clamped by the side inner wall (5a) of the vehicle body (50) and the rear seat (S) in a folded state and expand and unfold, thus becoming a second expanded and unfolded state.

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