Roof airbag arrangement for a vehicle

Abstract

A roof airbag device for a vehicle includes a roof airbag cushion that protects an occupant, and the roof airbag cushion can be divided into a front airbag cushion and a rear airbag cushion. In particular, upon an accident, the front airbag cushion and the rear airbag cushion are deployed into a space between front and rear occupants in a face-to-face mode, such that the front occupant is protected by the deployed front airbag cushion and the rear occupant is protected by the deployed rear airbag cushion.

Description

Technical Field

[0001] This disclosure relates to a roof airbag device for a vehicle that can more effectively protect front and rear passengers in the vehicle. Background Technology

[0002] The content in the background section is only provided as background information in relation to this disclosure and may not constitute prior art.

[0003] As a solution to protect the safety of vehicle passengers, various types of airbag devices are installed in vehicles. Among them, the roof airbag device is installed on the roof panel of the vehicle, and the airbag cushion deploys downwards to protect passengers in the event of an accident.

[0004] Meanwhile, autonomous vehicles are intelligent vehicles that utilize autonomous driving technology, enabling them to reach their destination without driver intervention (driver control of the steering wheel, accelerator pedal, brake pedal, etc.). In recent years, the development of autonomous vehicles has been rapid.

[0005] When autonomous driving technology becomes widespread, drivers can choose to rest instead of driving the vehicle while it is in motion. In particular, front and rear passengers can enjoy a face-to-face conversation mode where they sit facing each other.

[0006] In this way, when an accident occurs while the front and rear passengers are seated facing each other, the airbag cushion that constitutes the roof airbag system deploys between the front and rear passengers to protect them.

[0007] However, we have found that in traditional roof airbag systems, the airbag cushion consists of a single-chamber cushion that deploys between the front and rear passengers. Therefore, if either the front or rear passenger collides with the deployed airbag cushion first and comes into contact with it, the single-chamber cushion absorbs the impact while being forcefully pushed towards the opposite side. Consequently, the passenger on the opposite side is violently impacted by the pushed-out airbag cushion, increasing the risk of injury to them, and in severe cases, causing backward head injuries.

[0008] The content described in the related art is only for the purpose of helping to understand the background of this disclosure and should not be regarded as corresponding to related art known to those skilled in the art. Summary of the Invention

[0009] This disclosure provides a roof airbag device for a vehicle that can more effectively protect front and rear passengers in a face-to-face configuration. The airbag cushion is composed of a cushion having two chambers, one for the front passenger and one for the rear passenger. When either the front or rear passenger first collides with and contacts the deployed airbag cushion, the impact on the airbag cushion in the opposite direction can be minimized, thereby preventing injury to the passenger from the deployed airbag cushion as much as possible.

[0010] According to one form of this disclosure, a roof airbag device for a vehicle includes a front airbag cushion and a rear airbag cushion, which are mounted on the roof of the vehicle in a folded state and deploy between a front passenger and a rear passenger by receiving pressure from airbag gas. In the event of an accident in a face-to-face configuration where the front passenger and the rear passenger are seated facing each other, the front passenger is protected while in contact with the deployed front airbag cushion, and the rear passenger is protected while in contact with the deployed rear airbag cushion.

[0011] The front and rear airbags can deploy simultaneously.

[0012] The roof airbag device for a vehicle may further include a front inflator and a rear inflator that generate airbag gas to the front airbag pad and the rear airbag pad, respectively, wherein the front inflator and the rear inflator are fixedly mounted on the roof of the vehicle and configured to be connected to the front airbag pad and the rear airbag pad via a front hose and a rear hose, respectively.

[0013] The roof airbag device for a vehicle may further include: a front tether connected to the front airbag cushion to maintain the shape of the front airbag cushion when the front airbag cushion deploys; and a rear tether connected to the rear airbag cushion to maintain the shape of the rear airbag cushion when the rear airbag cushion deploys.

[0014] The front and back ties can be cotton ties made of fabric.

[0015] The upper and lower ends of the front and rear airbag cushions can be configured to connect to each other.

[0016] The roof airbag device for a vehicle may further include: an upper plate and a lower plate connected to connect the upper ends of the front airbag pad and the upper ends of the rear airbag pad to each other, and to connect the lower ends of the front airbag pad and the lower ends of the rear airbag pad to each other, respectively; an airbag housing in which the front airbag pad and the rear airbag pad are housed in a folded state; and an airbag cover covering the front airbag pad and the rear airbag pad housed in the airbag housing, and forming a front tear line and a rear tear line in the airbag cover, respectively torn by the deployment pressure of the front airbag pad and the rear airbag pad, wherein bolts pass sequentially through the airbag cover, the lower plate, the upper plate and the airbag housing, and are then fastened to a roof crossbar connected to the roof panel, such that the roof airbag device for the vehicle is fixedly mounted on the roof of the vehicle.

[0017] Bolt holes for bolts to pass through can be formed in the upper plate and the lower plate respectively. The diameter of the bolt hole formed in the upper plate can be larger than the diameter of the bolt thread and smaller than the diameter of the bolt head. The diameter of the bolt hole formed in the lower plate can be larger than the diameter of the bolt head.

[0018] The roof airbag device for a vehicle may further include: a front leg protector extending downward from the lower end of the front airbag and a rear leg protector extending downward from the lower end of the rear airbag, based on the deployment of the front and rear airbags, wherein the front and rear leg protectors extend into the space between the knees of the front and rear passengers to protect the knees and shins of the passengers.

[0019] With the front and rear airbag cushions folded and housed within the airbag housing, if the front and rear inflators explode or ignite due to an accident, generating airbag gas, the front and rear airbag cushions deploy under the pressure of the airbag gas. The front and rear tear lines of the airbag cover begin to tear due to the deployment pressure of the front and rear airbag cushions, and the lower plate separates as it detaches from the bolts. When the lower plate detaches from the bolts, the lower ends of the front and rear airbag cushions and the lower plate can deploy under their own weight into the space between the front and rear passengers in face-to-face mode. The front and rear passengers can be protected by contacting the deployed front and rear airbag cushions, respectively.

[0020] When front-seat passengers come into contact with the deployed front airbag, the front airbag changes shape to absorb the impact force, and the rear airbag is not pushed behind the rear-seat passengers.

[0021] When a rear passenger comes into contact with the deployed rear airbag, the rear airbag changes shape to absorb the impact force, and the front airbag is not pushed in front of the front passenger.

[0022] The bolts fastened to the roof panel can serve as the pad hinges for the deployed front and rear airbags. In the event of a collision, when the front passenger contacts the front airbag or the rear passenger contacts the rear airbag, the front and rear airbags can absorb collision energy while rotating around the pad hinges, minimizing tension at the upper end.

[0023] Further applicability will become apparent from the description provided herein. It should be understood that the descriptions and specific examples are for illustrative purposes only and are not intended to limit the scope of this disclosure. Attached Figure Description

[0024] To better understand this disclosure, its various forms will now be described by way of example and with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a view used to describe the state of the front and rear airbag pads of a vehicle roof airbag device according to one form of the present disclosure before deployment;

[0026] Figure 2 yes Figure 1 Enlarged view of the roof airbag device in the CRRC;

[0027] Figure 3 This is a perspective view showing the assembled state of an airbag housing, airbag cover, front inflator, and rear inflator according to one form of the present disclosure;

[0028] Figure 4 yes Figure 2 A bottom view;

[0029] Figure 5 This is a view used to describe an upper plate and a lower plate according to another form of this disclosure;

[0030] Figure 6 It is shown Figure 1 A view showing the front and rear airbags in their deployed state; and

[0031] Figure 7 This is a view depicting a front airbag and a rear airbag, respectively provided with front leg protection and rear leg protection, according to another form of this disclosure.

[0032] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way. Detailed Implementation

[0033] The following description is exemplary in nature only and is not intended to limit this disclosure, its application, or its uses. It should be understood that in all the drawings, corresponding reference numerals denote the same or corresponding parts and features.

[0034] The specific structural or functional descriptions disclosed herein are solely for describing the form of this disclosure as disclosed in this specification or application. Therefore, this disclosure may be implemented in various forms, and this disclosure should not be construed as being limited to the form described in this specification or application.

[0035] Because this disclosure can be modified in various ways and can have multiple forms, specific forms will be shown in the accompanying drawings and described in detail in this specification or application. However, it should be understood that this disclosure is not limited to the specific forms, but includes all modifications, equivalents, and substitutions that fall within the spirit and scope of this disclosure.

[0036] Terms such as “first” and “second” may be used to describe various components, but these components should not be construed as being limited to these terms. These terms are used only to distinguish one component from another. For example, without departing from the scope of this disclosure, a “first” component may be referred to as a “second” component and a “second” component may similarly be referred to as a “first” component.

[0037] It should be understood that when a component is referred to as "connected to" or "linked to" another component, a component can be directly connected to or linked to the other component, or connected to or linked to the other component with other components inserted in between. On the other hand, it should be understood that when a component is referred to as "directly connected to" or "directly linked to" another component, it can be connected to or linked to the other component without other components inserted in between. Other expressions used to describe the relationship between components, such as "between," "directly between," "adjacent to," "directly adjacent to," etc., can be interpreted similarly.

[0038] The terminology used in this specification is for descriptive purposes only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form. It should be understood that the terms "comprising" or "having" as used herein specify the presence of the stated feature, quantity, step, operation, component, part, or combination thereof, but do not preclude the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0039] Unless otherwise stated, it should be understood that all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in general dictionaries should be interpreted as having the same meaning as in the relevant technical context, and should not be interpreted as having an ideal or overly formal meaning unless expressly defined in this specification.

[0040] According to one form of the present disclosure, the controller can be implemented using a non-volatile memory (not shown) and a processor (not shown). The non-volatile memory is configured to store data of algorithms for controlling the operation of various components of the vehicle or software instructions for reproducing the algorithms. The processor is configured to utilize the data stored in the non-volatile memory to perform operations described below. Here, the memory and processor can be implemented as separate chips. Alternatively, the memory and processor can be integrated with each other and implemented as a single chip. The processor can take the form of one or more processors.

[0041] In the following description, an exemplary form of a roof airbag device for a vehicle according to the present disclosure will be described with reference to the accompanying drawings.

[0042] like Figures 1 to 7 As shown, the roof airbag device for a vehicle according to the present disclosure is configured such that, in the event of an accident in a face-to-face mode in which the front passenger 1 and the rear passenger 2 are seated facing each other, the airbag cushion constituting the roof airbag device deploys between the front passenger 1 and the rear passenger 2 to protect the front passenger 1 and the rear passenger 2.

[0043] In one embodiment, the roof airbag device 3 includes a front airbag cushion 10 and a rear airbag cushion 20, which are mounted on the roof of the vehicle in a folded state and deploy between the front passenger 1 and the rear passenger 2 by receiving the pressure of the airbag gas. In the event of an accident in a face-to-face configuration where the front passenger 1 and the rear passenger 2 are seated facing each other, the front passenger 1 is protected when in contact with the deployed front airbag cushion 10, while the rear passenger 2 is protected when in contact with the deployed rear airbag cushion 20.

[0044] That is, in the roof airbag device 3, the airbag cushion used to protect passengers is divided into a front airbag cushion 10 and a rear airbag cushion 20, and the front airbag cushion 10 and the rear airbag cushion 20 independently protect the front passenger 1 and the rear passenger 2, respectively.

[0045] In one configuration, the front airbag cushion 10 and the rear airbag cushion 20 deploy simultaneously, and if necessary, can be configured to deploy at intervals and sequentially.

[0046] In another form, the roof airbag device 3 further includes a front inflator 30 and a rear inflator 40, which generate airbag gas to the front airbag cushion 10 and the rear airbag cushion 20, respectively. The front inflator 30 and the rear inflator 40 are fixedly mounted on the roof and configured to be connected to the front airbag cushion 10 and the rear airbag cushion 20, respectively, via a front hose 31 and a rear hose 41.

[0047] Additionally, the roof airbag device 3 further includes: a front tether 50, connected to the front airbag cushion 10 to maintain the shape of the front airbag cushion 10 when the front airbag cushion 10 is deployed; and a rear tether 60, connected to the rear airbag cushion 20 to maintain the shape of the rear airbag cushion 20 when the rear airbag cushion 20 is deployed.

[0048] The front tether 50 and the rear tether 60 are cotton tethers made of fabric material. When the front airbag cushion 10 and the rear airbag cushion 20 are folded, the front tether 50 and the rear tether 60 are folded together with the front airbag cushion 10 and the rear airbag cushion 20. When the front airbag cushion 10 and the rear airbag cushion 20 are unfolded, the front tether 50 and the rear tether 60 are unfolded together with the front airbag cushion 10 and the rear airbag cushion 20, thereby maintaining the shape of the unfolded front airbag cushion 10 and the rear airbag cushion 20.

[0049] It is necessary to restrict the movement of the front airbag cushion 10 and the rear airbag cushion 20 to a certain extent in order to enhance the protection of the front passenger 1 and the rear passenger 2 when the front airbag cushion 10 and the rear airbag cushion 20 are deployed. For this purpose, in a type of roof airbag device 3 for a vehicle according to the present disclosure, the upper and lower ends of the front airbag cushion 10 and the rear airbag cushion 20 are configured to be connected to each other.

[0050] That is, the upper ends of the front airbag cushion 10 and the rear airbag cushion 20 are sewn and connected to the upper plate 70 to connect with each other, and the lower ends of the front airbag cushion 10 and the rear airbag cushion 20 are sewn and connected to the lower plate 80 to connect with each other.

[0051] When the upper ends of the front airbag cushion 10 and the rear airbag cushion 20 are sewn and connected to the upper plate 70, the upper ends of the front tether 50 and the rear tether 60 are also sewn and connected to the upper plate 70 so that they are integrally connected to each other.

[0052] In addition, when the lower ends of the front airbag cushion 10 and the rear airbag cushion 20 are sewn and connected to the lower plate 80, the lower ends of the front tether 50 and the rear tether 60 are also sewn and connected to the lower plate 80 so that they are integrally connected to each other.

[0053] In another embodiment, the roof airbag device further includes: an airbag housing 90, a front airbag pad 10 and a rear airbag pad 20 housed in the airbag housing 90 in a folded state; and an airbag cover 110 that covers the front airbag pad 10 and the rear airbag pad 20 housed in the airbag housing 90, and forms a front tear line 111 and a rear tear line 112 in the airbag cover 110 that are torn by the deployment pressure of the front airbag pad 10 and the rear airbag pad 20, respectively.

[0054] The roof airbag device 3 can be fixedly installed on the roof of the vehicle. In this configuration, bolts 120 pass sequentially through the airbag cover 110, the lower plate 80, the upper plate 70, and the airbag housing 90, and are then fastened to the roof crossbar (roof beam) 5 connected to the roof panel 4, so that the roof airbag device 3 for the vehicle is fixedly installed on the roof of the vehicle.

[0055] When the front tear line 111 and the rear tear line 112 are torn by the deployment pressure of the front airbag cushion 10 and the rear airbag cushion 20, the airbag cover 110 is divided into an outer portion connected to the airbag housing 90 and an intermediate portion fixed by bolts 120, and the front airbag cushion 10 and the rear airbag cushion 20 perform the deployment operation while falling downward through the space between the outer portion and the intermediate portion that are separated from each other.

[0056] like Figure 5 As shown, bolt holes 71 and 81 through which bolt 120 passes are formed in the upper plate 70 and the lower plate 80, respectively. The diameter D1 of the bolt hole 71 formed in the upper plate 70 is greater than the diameter D3 of the thread portion 121 of bolt 120 and smaller than the diameter D4 of the head 122 of bolt 120. The diameter D2 of the bolt hole 81 formed in the lower plate 80 is greater than the diameter D4 of the head 122 of bolt 120.

[0057] exist Figure 5 In the attached diagram, the label "S" indicates the stitched connection portion.

[0058] Therefore, in such Figure 1 and Figure 2 With the front airbag cushion 10 and rear airbag cushion 20 folded and housed in the airbag housing 90, when the front inflator 30 and rear inflator 40 explode or ignite due to an accident and generate airbag gas, the front airbag cushion 10 and rear airbag cushion 20 unfold under the pressure of the airbag gas, and the front tear line 111 and rear tear line 112 of the airbag cover 110 begin to tear under the unfolding pressure of the front airbag cushion 10 and rear airbag cushion 20.

[0059] When the front tear line 111 and the rear tear line 112 of the airbag cover 110 are torn, the lower plate 80 separates downwards as it detaches from the bolts 120. Therefore, the lower ends of the front airbag cushion 10 and the rear airbag cushion 20 deploy under the pressure of the airbag gas, while simultaneously being positioned in the space between the front passenger 1 and the rear passenger 2 in face-to-face mode by the weight of the front airbag cushion 10 and the rear airbag cushion 20.

[0060] In this configuration, the upper plate 70, the upper end of the front airbag cushion 10, the upper end of the rear airbag cushion 20, and the airbag housing 90 remain fixed to the roof cross plate 5 by bolts 120.

[0061] At the same time, such as Figure 6As shown, when the front airbag 10 and the rear airbag 20 are deployed in the space between the front passenger 1 and the rear passenger 2 in face-to-face mode, the front passenger 1 and the rear passenger 2 come into contact with the deployed front airbag 10 and the rear airbag 20 respectively, and the impact force is absorbed by the front airbag 10 and the rear airbag 20 respectively, thereby protecting the front passenger 1 and the rear passenger 2.

[0062] That is, when the front passenger 1 comes into contact with the deployed front airbag 10, the shape of the front airbag 10 changes while absorbing the impact force to protect the front passenger 1. In this case, the rear airbag 20 will not be pushed behind the rear passenger 2, thereby preventing injury to the rear passenger 2 due to the rear airbag 20 being pushed backward.

[0063] Furthermore, when the rear passenger 2 comes into contact with the deployed rear airbag cushion 20, the rear airbag cushion 20 changes shape while absorbing the impact force to protect the rear passenger 2. In this situation, the front airbag cushion 10 will not be pushed in front of the front passenger 1, thereby preventing injury to the front passenger 1 due to the front airbag cushion 10 being pushed forward.

[0064] In another form, such as Figure 7 As shown, the roof airbag device 3 further includes a front leg protection portion 11 extending downward from the lower end of the front airbag 10 and a rear leg protection portion 21 extending downward from the lower end of the rear airbag 20, based on the deployed state of the front airbag cushion 10 and the rear airbag cushion 20. In particular, the front leg protection portion 11 and the rear leg protection portion 21 extend into the space between the knees of the front passenger 1 and the rear passenger 2 to protect the knees and shins of the passengers.

[0065] In another embodiment of this disclosure, the bolts 120 fastened to the roof crossbar 5 serve as the pad hinges for the deployed front airbag cushion 10 and rear airbag cushion 20. In the event of a vehicle collision, when the front passenger 1 contacts the front airbag cushion 10 or the rear passenger 2 contacts the rear airbag cushion 20, the front airbag cushion 10 and rear airbag cushion 20 absorb collision energy while rotating around the pad hinges. Therefore, tension at the upper ends is minimized, thereby further enhancing passenger protection.

[0066] As described above, in some forms of vehicle roof airbag devices according to this disclosure, the roof airbag cushions protecting passengers are configured as a front airbag cushion 10 and a rear airbag cushion 20. In the event of an accident, the front airbag cushion 10 and the rear airbag cushion 20 are positioned in the space between the front passenger 1 and the rear passenger 2 in a face-to-face configuration and deploy. The front passenger 1 contacts the deployed front airbag cushion 10, allowing the impact force to be absorbed by the front airbag cushion 10, thereby protecting the front passenger 1. The rear passenger 2 contacts the deployed rear airbag cushion 20, allowing the impact force to be absorbed by the rear airbag cushion 20, thereby protecting the rear passenger 2. Therefore, the exemplary forms of vehicle roof airbag devices according to this disclosure can more effectively protect the front passenger 1 and the rear passenger 2 in a face-to-face configuration.

[0067] In addition, when the front passenger 1 comes into contact with the deployed front airbag 10, the rear airbag 20 will not be pushed behind the rear passenger 2, thus preventing injury to the rear passenger 2 due to the push of the rear airbag 20. And when the rear passenger 2 comes into contact with the deployed rear airbag 20, the front airbag 10 will not be pushed in front of the front passenger 1, thus preventing injury to the front passenger 1 due to the push of the front airbag 10.

[0068] Although this disclosure has been shown and described with reference to exemplary forms, it will be apparent to those skilled in the art that various modifications and changes may be made to this disclosure without departing from its spirit and scope.

Claims

1. A roof airbag device for a vehicle, comprising: a front airbag cushion and a rear airbag cushion mounted on a roof of the vehicle in a folded state, respectively, and deployed between front seat passengers and rear seat passengers by receiving pressure of airbag gas, and a lower plate coupled to connect lower ends of the front airbag cushion and the rear airbag cushion to each other, lower ends of a front tether maintaining a shape of the front airbag cushion when the front airbag cushion is deployed and a rear tether maintaining a shape of the rear airbag cushion when the rear airbag cushion is deployed are coupled to the lower plate, wherein, when the front seat passengers and the rear seat passengers sit face to face in the vehicle and an accident occurs, the deployed front airbag cushion contacts and protects the front seat passengers, and the deployed rear airbag cushion contacts and protects the rear seat passengers.

2. The roof airbag device according to claim 1, wherein The front airbag cushion and the rear airbag cushion are deployed simultaneously.

3. The roof airbag arrangement of claim 1, further comprising: a front inflator and a rear inflator generating the airbag gas supplied to the front airbag cushion and the rear airbag cushion, respectively, wherein the front inflator and the rear inflator are fixedly mounted on the roof of the vehicle and connected to the front airbag cushion and the rear airbag cushion by a front hose and a rear hose, respectively.

4. The roof airbag device according to claim 3, wherein The front tether and the rear tether are cotton tethers formed of a fabric material.

5. The roof airbag device according to claim 1, wherein Upper ends and lower ends of the front airbag cushion and the rear airbag cushion are connected to each other. 6.The roof airbag device of claim 3, further comprising: an upper plate coupled to connect upper ends of the front airbag cushion and the rear airbag cushion to each other; an airbag housing in which the front airbag cushion and the rear airbag cushion are accommodated in a folded state; and an airbag cover simultaneously covering the front airbag cushion and the rear airbag cushion accommodated in the airbag housing, and in which a front tear line and a rear tear line torn by deployment pressure of the front airbag cushion and the rear airbag cushion, respectively, are formed, wherein a bolt passes through the airbag cover, the lower plate, the upper plate, and the airbag housing in this order, and is then fastened to a roof cross plate coupled to a roof panel, so that the roof airbag device is fixedly mounted on the roof of the vehicle.

7. The roof airbag device according to claim 6, wherein Bolt holes through which the bolt passes are formed in the upper plate and the lower plate, respectively, a diameter of the bolt hole formed in the upper plate is greater than a diameter of a threaded portion of the bolt and less than a diameter of a head of the bolt, a diameter of the bolt hole formed in the lower plate is greater than the diameter of the head of the bolt. 8.The roof airbag device of claim 1, further comprising: a front leg protection portion extending downward from a lower end of the front airbag cushion in a deployed state of the front airbag cushion and the rear airbag cushion, and a rear leg protection portion extending downward from a lower end of the rear airbag cushion, wherein the front leg protection portion and the rear leg protection portion are deployed into a space between knees of the front seat passengers and the rear seat passengers to protect the knees and shins of the front seat passengers and the rear seat passengers.

9. The roof airbag device according to claim 6, wherein In a state in which the front airbag cushion and the rear airbag cushion are folded and accommodated in the airbag housing, when the front inflator and the rear inflator explode or ignite and generate the airbag gas due to an accident, the front airbag cushion and the rear airbag cushion are deployed by the pressure of the airbag gas, the front tear line and the rear tear line of the airbag cover are started to tear by the deployment pressure of the front airbag cushion and the rear airbag cushion, and the lower plate is separated while being detached from the bolt; When the lower plate is detached from the bolt, lower ends of the front airbag cushion and the rear airbag cushion and the lower plate are deployed into a space between the front seat passenger and the rear seat passenger by the self-weight of the front airbag cushion, the rear airbag cushion, and the lower plate; and The front seat passenger and the rear seat passenger are protected by contacting the deployed front airbag cushion and the rear airbag cushion, respectively.

10. The roof airbag device according to claim 9, wherein When the front seat passenger contacts the deployed front airbag cushion, the front airbag cushion absorbs an impact force while changing an outer shape thereof, and a phenomenon in which the rear airbag cushion is pushed toward a rear where the rear seat passenger is located does not occur.

11. The roof airbag arrangement of claim 9, wherein, When the rear seat passenger contacts the deployed rear airbag cushion, the rear airbag cushion absorbs an impact force while changing an outer shape thereof, and a phenomenon in which the front airbag cushion is pushed toward a front where the front seat passenger is located does not occur.

12. The roof airbag arrangement of claim 6, wherein, The bolt fastened to the roof panel becomes a cushion hinge portion of the deployed front airbag cushion and the rear airbag cushion, and In the case where the vehicle collides, when the front seat passenger contacts the front airbag cushion or the rear seat passenger contacts the rear airbag cushion, the front airbag cushion and the rear airbag cushion absorb collision energy while rotating around the cushion hinge portion, so that a tension of an upper end portion is minimized.

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