Roof airbag of vehicle

Abstract

A roof airbag for a vehicle is disclosed, comprising a bracket provided on the roof and deployed into the interior space of the vehicle, an inflator connected to the bracket and emitting expansion gas upon operation, an airbag cushion folded and provided on an airbag cover connected to the bracket and deployed into the interior space of the vehicle by supplying expansion gas from the inflator, and a tether that supports the airbag cushion, with one end fixed to the roof and the other end connected to the airbag cushion, so that the airbag cushion deploys toward a seat when the airbag cushion deploys.

Description

Technology Field

[0001] The embodiments disclosed in this document relate to a roof airbag of a vehicle that deploys toward an occupant and can maintain its position in the deployed state. Background Technology

[0002] Airbags are essential for the safety of passengers in a vehicle. Vehicles are equipped with airbags that deploy from various positions, such as the front or sides, to protect the driver and passengers.

[0003] Vehicle airbags operate by deploying the airbag cushion when an inflator detonates inflation gas upon receiving an impact detection signal from an impact sensor. The deployed airbag cushion absorbs the impact on the occupants, thereby protecting them from bodily injury. Research and development on airbags are currently underway to effectively mitigate occupant injuries.

[0004] Meanwhile, interest in autonomous vehicles has been increasing recently. An autonomous vehicle is a vehicle equipped with autonomous driving technology that allows it to move on its own without the user or passenger directly controlling whether to move, the direction of travel, or the speed. Since the driver does not intervene in the operation of an autonomous vehicle, there is less need for the seat to be fixed facing forward. Consequently, the position and arrangement of the seat can vary, making the need for passenger protection by airbags critical.

[0005] In particular, roof airbags designed to protect occupants from rollover accidents are mounted on the vehicle's roof. When a rollover occurs, the roof airbag deploys from the roof to absorb the impact on the occupants and prevent them from being ejected from the vehicle body.

[0006] Conventional roof airbags operate to protect occupants by covering the vehicle's roof. However, because conventional roof airbags deploy simply to cover the roof, there were limitations to their occupant protection. Furthermore, when the roof airbag deployed into the vehicle's interior, a problem existed where external forces applied by an occupant on one side of the airbag pushed it to the other, causing injury to the occupant located on the other side.

[0007] The matters described above as background technology are intended only to enhance understanding of the background of the embodiments and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. The problem to be solved

[0008] The embodiments provide a vehicle roof airbag that deploys from the roof of the vehicle in the event of a collision, and effectively protects the occupant by deploying toward the occupant.

[0009] In addition, it provides a vehicle roof airbag that maintains its position when deployed and can adjust the way the airbag cushion deploys.

[0010] The problems to be solved through the embodiments are not limited to those described above, and problems not mentioned will be clearly understood by those skilled in the art to which the embodiments belong from this specification and the attached drawings. means of solving the problem

[0011] To solve the above-mentioned problem, a roof airbag of a vehicle according to one embodiment is a roof airbag disposed on the roof of a vehicle and deployed into the interior space of the vehicle, and may include: a bracket provided on the roof; an inflator connected to the bracket and discharging inflation gas upon operation; an airbag cushion folded and provided on an airbag cover connected to the bracket, and deployed into the interior space of the vehicle by supplying inflation gas from the inflator; and a tether that supports the airbag cushion, with one end fixed to the roof side and the other end connected to the airbag cushion, so that when the airbag cushion is deployed, the airbag cushion deploys toward the seat.

[0012] The above airbag cushion may include a first chamber that deploys toward one side of the vehicle width direction upon deployment and a second chamber that deploys toward the other side of the vehicle width direction.

[0013] Additionally, the tether may include a first tether, one end of which is fixed at a distance from the center of the vehicle width direction in the loop and the other end of which is connected to the first chamber, and a second tether, one end of which is fixed at a distance from the center of the vehicle width direction in the loop and the other end of which is connected to the second chamber.

[0014] The above inflator may include a first inflator connected to the first chamber and a second inflator connected to the second chamber, and the first inflator and the second inflator may operate independently of each other.

[0015] It includes a fastening member that penetrates the bracket and the airbag cover and is mounted on the loop, and the airbag cushion may include a first chamber and a second chamber provided on both sides with respect to the fastening member.

[0016] In addition, the length of the tether may be shorter than or equal to the length of the airbag cushion.

[0017] In addition, the airbag cushion may include a plurality of guide sections that guide the flow of the expansion gas inside.

[0018] The plurality of guide sections may extend in the width direction of the airbag cushion and be spaced apart at a predetermined interval in the length direction of the airbag cushion.

[0019] Additionally, a roof airbag of a vehicle according to one embodiment further comprises an airflow path through which the expansion gas flows when the expansion gas is supplied from the inflator into the interior of the airbag cushion; wherein the airflow path may include a first airflow path through which the expansion gas flows to the outer edge of the airbag cushion when the expansion gas is discharged from the inflator, and a second airflow path through which the expansion gas branches off from the first airflow path and flows to the center of the airbag cushion.

[0020] The airbag cushion includes guide portions that extend in the width direction of the airbag cushion and are spaced apart at a predetermined interval in the length direction of the airbag cushion, and the first airflow path is formed on the outer side of the plurality of guide portions, and the second airflow path may be formed between the plurality of guide portions.

[0021] In addition, the above bracket can be installed on the cross panel of the above loop. Effects of the invention

[0022] A roof airbag of a vehicle according to one embodiment deploys toward an occupant seated in a seat when deployed, thereby protecting the occupant quickly and effectively in the event of a collision.

[0023] In addition, when deployed toward the occupant, it is firmly supported by a tether, allowing it to maintain its position without being pushed by the occupant's body, thereby preventing injury to the occupant caused by the movement of the airbag cushion.

[0024] The effects of the embodiments are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings. Brief explanation of the drawing

[0025] FIG. 1 is a drawing showing a roof airbag of a vehicle according to one embodiment mounted on the roof of the vehicle. Figure 2 is a cross-sectional view of AA of Figure 1. Figure 3 is a cross-sectional view of BB in Figure 1. FIG. 4 is a schematic diagram illustrating the deployed state of a roof airbag of a vehicle according to one embodiment. FIG. 5 is a drawing illustrating the cushion of a roof airbag of a vehicle according to one embodiment. Specific details for implementing the invention

[0026] Specific structural or functional descriptions of embodiments of the present invention disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to this disclosure, and embodiments according to this disclosure may be implemented in various forms and should not be interpreted as being limited to embodiments described in this specification or application.

[0027] Since embodiments according to the present disclosure may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present disclosure.

[0028] Terms such as "first" and / or "second" may be used to describe various components, but said components shall not be limited by said terms. For the sole purpose of distinguishing one component from another, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0029] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions describing the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way.

[0030] The terms used herein are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to specify the existence of the described features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.

[0032] The present invention will be described in detail below by explaining preferred embodiments of the invention with reference to the attached drawings. Identical reference numerals in each drawing indicate identical components.

[0033] FIG. 1 is a drawing showing a state in which a roof airbag of a vehicle according to one embodiment is mounted on the roof of a vehicle, FIG. 2 is a cross-sectional view AA of FIG. 1, and FIG. 3 is a cross-sectional view BB of FIG. 1.

[0034] Referring to FIGS. 1 to 3, a roof airbag (10) of a vehicle according to one embodiment may include a bracket (100) provided on the roof (L), an inflator (200) that discharges expansion gas, an airbag cushion (300) that deploys into the interior space of the vehicle when expansion gas is supplied, and a tether (400) that supports the airbag cushion (300) when the airbag cushion (300) is deployed.

[0035] The bracket (100) can be mounted on the roof (L) of a vehicle. The bracket (100) can secure the roof airbag (10) of the vehicle according to the present embodiment to the roof (L) of the vehicle. The bracket (100) can be connected to at least a portion of the airbag cover (301) described later. The bracket (100) can be made of a material having the property of being able to withstand the impact energy generated when the airbag cushion (300) deploys.

[0036] The bracket (100) can be mounted to the roof (L) of the vehicle by means of a fastening member (110). The fastening member (110) can secure the roof airbag (10) to the roof (L) of the vehicle by penetrating the bracket (100) and inserting at least a portion of it into the roof (L) of the vehicle. For example, the fastening member (110) may be a bolt that penetrates the bracket (100) and is inserted into the roof (L) of the vehicle. Multiple fastening members (110) may be provided.

[0037] The bracket (100) can be mounted on the cross panel (C). By mounting the bracket (100) on the cross panel (C), the roof airbag (10) can be stably mounted on the roof (L) side. The bracket (100) is mounted on the cross panel (C), and an airbag cover (301) containing a folded airbag cushion (300) can be placed on the lower part of the bracket (100).

[0038] Referring to FIG. 2, a head lining (H) may be placed on the lower part of the roof airbag (10) of the vehicle. When mounting the roof airbag (10) of the vehicle according to one embodiment onto the vehicle, the head lining may be mounted after the airbag cover (301) and the bracket (100) are mounted to the cross panel (C) by a fastening member (110). The fastening member (110) may be mounted to the roof (L) panel by penetrating the airbag cover (301) and the bracket (100).

[0039] Accordingly, an airbag cushion (300) can be placed between the bracket (100) and the head lining (H).

[0040] The inflator (200) can be connected to the bracket (100) to fix its position. The bracket (100) may have a shape at the point where the inflator (200) is connected that corresponds to the shape of the inflator (200). For example, if the inflator (200) is cylindrical, at least a portion of the point where the bracket (100) is connected to the inflator (200) may be cylindrical.

[0041] The inflator (200) and the bracket (100) can be fastened by a clamp band (201) including a flange. The clamp band (201) can stably connect the bracket (100) and the inflator (200). Additionally, the clamp band (201) can seal the connection point between the bracket (100) and the inflator (200) so that exhaust gas discharged from the inflator (200) does not leak out to the outside.

[0042] The inflator (200) can discharge expansion gas when operated. The inflator (200) can communicate with the interior of the airbag cushion (300).

[0043] The inflator (200) can inject expansion gas toward the airbag cushion (300) housed inside the bracket (100). Although not shown in the drawing, the inflator (200) may include an ignition device, a gas generator in which gunpowder and expansion gas are stored, and a diffuser that guides the flow of expansion gas. When the collision detection sensor detects a collision of the vehicle, it transmits a collision detection signal to the ECU (not shown), and the ECU (not shown) can operate the inflator (200) based on the collision detection signal.

[0044] The inflator (200) may include a first inflator (210) and a second inflator (220). The first inflator (210) and the second inflator (220) may be arranged to face each other. As shown in FIG. 1, the first inflator (210) and the second inflator (220) may be arranged to face each other with respect to the direction in which the cross panel (C) extends.

[0045] Referring to FIG. 3, the airbag cushion (300) can be accommodated inside the airbag cover (301). The airbag cushion (300) can be accommodated inside the airbag cover (301) in a folded state. When the airbag cushion (300) receives inflation gas from the inflator (200), it can inflate, thereby cutting through the cut portion of the airbag cover (301) and deploying into the interior space of the vehicle.

[0046] The tether (400) can support the airbag cushion (300) so that when the airbag cushion (300) is deployed, the airbag cushion (300) is deployed toward the seat. In the roof airbag (10) according to the present embodiment, the tether (400) can position the direction when the airbag cushion (300) is deployed and maintain the position of the airbag cushion (300) when the airbag cushion (300) is deployed. Therefore, in the roof airbag (10) of the vehicle according to the present embodiment, when the airbag cushion (300) is deployed into the interior space of the vehicle, it is not simply deployed downward from the roof (L) toward the interior space of the vehicle, but can be deployed toward the seat by means of the tether (400).

[0047] One end of the tether (400) is fixed to the loop (L) side, and the other end can be connected to the end of the airbag cushion (300). When the airbag cushion (300) is deployed by supplying inflation gas from the inflator (200) to the airbag cushion (300), the other end of the tether (400) can move together with the airbag cushion (300). Accordingly, as the tether (400) becomes taut, tension is formed in the tether (400), and accordingly, the airbag cushion (300) can be supported by the tension of the tether (400). Details regarding the tether (400) will be described later with reference to FIG. 4.

[0048] Referring to FIG. 3, the airbag cushion (300) may include a first chamber (310) and a second chamber (320). The first chamber (310) and the second chamber (320) may be distinguished according to the position in which they are deployed. When the airbag cushion (300) is deployed, the first chamber (310) may be deployed to one side of the vehicle width direction (D1), and the second chamber (320) may be deployed to the other side of the vehicle width direction (D1). That is, the direction in which the first chamber (310) and the second chamber (320) are deployed may be opposite to the vehicle width direction (D1).

[0049] The fastening member (110) can be mounted on the roof (L) by penetrating the bracket (100) and the airbag cover (301), thereby securing the bracket (100) and the airbag cover (301) to the roof (L). The first chamber (310) and the second chamber (320) can be provided by folding on both sides of the bracket (100) with the fastening member (110) as the center. The space of the airbag cover (301) is divided into two sides by the fastening member (110), and the first chamber (310) and the second chamber (320) can be accommodated in the divided space, respectively.

[0050] Additionally, the first inflator (210) can be connected to the first chamber (310), and the second inflator (220) can be connected to the second chamber (320). The first inflator (210) can supply expansion gas to the first chamber (310), and the second inflator (220) can supply expansion gas to the second chamber (320). In other words, when the first inflator (210) is operated, the first chamber (310) can be expanded, and when the second inflator (220) is operated, the second chamber (320) can be expanded.

[0051] The first inflator (210) and the second inflator (220) can operate independently of each other. For example, when the first inflator (210) is operating, the second inflator (220) may not operate, and when the second inflator (220) is operating, the first inflator (210) may not operate. Depending on the location where the collision occurred, the direction of the collision, or whether a passenger is seated in the seat, the first inflator (210) and the second inflator (220) operate independently of each other, thereby effectively protecting the passenger in a manner appropriate to the situation and preventing the vehicle's roof airbag (10) from operating unnecessarily and requiring replacement of parts.

[0052] FIG. 4 is a schematic diagram illustrating the deployed state of a roof airbag of a vehicle according to one embodiment. With reference to FIG. 4, the structure of the deployment of the roof airbag (10) of a vehicle according to the present embodiment will be described in detail.

[0053] Referring to FIG. 4, the bracket (100) of the roof airbag (10) of a vehicle according to one embodiment may be positioned between seats. For example, the bracket (100) may be positioned at the center of the vehicle width direction (D1) in the roof (L). In the case of a typical vehicle, seats are positioned on both sides with the center of the vehicle width direction (D1) in between, so the bracket (100) may be positioned between seats when the bracket (100) is positioned at the center of the vehicle width direction (D1) in the roof (L). Thus, the bracket (100) may be positioned between occupants seated in the seats.

[0054] When the inflator (200) is activated by receiving a collision signal from a collision detection sensor, inflation gas can be supplied to the airbag cushion (300). When inflation gas is supplied into the interior of the airbag cushion (300), the airbag cushion (300) can expand and deploy into the interior space of the vehicle. At this time, the tether (400) can guide the airbag cushion (300) so that it deploys toward the seats positioned on both sides of the bracket (100).

[0055] The first chamber (310) can be deployed toward one side and the second chamber (320) can be deployed toward the other side by means of a tether (400). Accordingly, the first chamber (310) can protect the occupant (P) seated on one side, and the second chamber (320) can protect the occupant (P) seated on the other side.

[0056] Referring to FIG. 4, the tether (400) may include a first tether (410) connected to a first chamber (310) and a second tether (420) connected to a second chamber (320). When the airbag cushion (300) is deployed, one end of the first tether (410) is connected to the roof (L) at a distance from one side in the vehicle width direction (D1), and the other end of the first tether (410) may be connected to the end of the first chamber (310).

[0057] Likewise, one end of the second tether (420) is connected to the other side with respect to the vehicle width direction (D1) of the roof (L), and the other end of the second tether (420) can be connected to the end of the second chamber (320).

[0058] Since one end of the first tether (410) is connected at a distance to one side with respect to the vehicle width direction (D1), the other end of the first tether (410) can limit the direction in which the first chamber (310) unfolds to one side when it unfolds. Accordingly, the first chamber (310) can unfold toward one side with respect to the vehicle width direction (D1) by the tension of the first tether (410).

[0059] Additionally, since one end of the second tether (420) is connected to the other side with respect to the vehicle width direction (D1), the other end of the second tether (420) can restrict the direction in which the second chamber (320) unfolds to the other side when the second chamber (320) unfolds. Accordingly, the second chamber (320) can unfold toward the other side with respect to the vehicle width direction (D1) by the tension of the second tether (420).

[0060] In other words, the first tether (410) can guide the first chamber (310) to unfold to one side with respect to the vehicle width direction (D1), and the second tether (420) can guide the second chamber (320) to unfold to the other side with respect to the vehicle width direction (D1).

[0061] Referring to FIG. 4 for a detailed description, one end of the first tether (410) can be fixed at a certain distance from the center of the vehicle width direction (D1) of the roof (L) in the direction where the first chamber (310) is located, and the other end can be connected to the end of the first chamber (310). When expansion gas is supplied to the airbag cushion (300), the first chamber (310) is deployed. Since one end of the first tether (410) is fixed at a distance from the center of the vehicle width direction (D1) toward the side where the first chamber (310) is located, the first chamber (310) can be naturally deployed toward one side of the vehicle width direction (D1) by the first tether (410). Tension may be formed in the first tether (410) in conjunction with the expansion of the first chamber (310), and the first chamber (310) may be maintained in a state expanded toward one side of the vehicle width direction (D1) by the tension of the first tether (410).

[0062] Likewise, one end of the second tether (420) can be fixed at a certain distance from the center of the vehicle width direction (D1) toward the direction where the second chamber (320) is located, and the other end can be connected to the end of the second chamber (320). When expansion gas is supplied to the airbag cushion (300), the second chamber (320) is deployed. Since one end of the second tether (420) is fixed at a distance from the center of the vehicle width direction (D1) toward the side where the second chamber (320) is located, the second chamber (320) can naturally be deployed toward the other side of the vehicle width direction (D1) by the second tether (420). Tension can be formed in the second tether (420) in conjunction with the expansion of the second chamber (320), and the second chamber (320) can be maintained in a deployed state toward the other side of the vehicle width direction (D1) by the tension of the second tether (420).

[0063] The first chamber (310) can protect a passenger (P) seated on one side of the vehicle width direction (D1) by deploying to one side of the vehicle width direction (D1), and the second chamber (320) can protect a passenger (P) seated on the other side of the vehicle width direction (D1) by deploying to the other side of the vehicle width direction (D1). In the event of a collision accident of the vehicle, the roof airbag (10) according to the present disclosure can effectively protect the passenger (P) from the collision accident by deploying toward the passenger (P) seated in the seat.

[0064] When the first chamber (310) and the second chamber (320) are deployed toward the occupant (P), they come into contact with the chest area of ​​the occupant (P) and can absorb the impact. The first tether (410) and the second tether (420) each form tension to maintain the deployed positions of the first chamber (310) and the second chamber (320), thereby effectively restraining the movement of the occupant. Therefore, in the event of a collision, it is possible to prevent occupants (P) seated adjacent to each other from affecting one another.

[0065] FIG. 5 is a drawing illustrating the cushion of a roof airbag (10) of a vehicle according to one embodiment.

[0066] Referring to FIG. 5, when the airbag cushion (300) is deployed, the length (Y) of the tether (400) may be shorter than or equal to the length (X) of the airbag cushion (300). That is, the length (Y) from one end of the tether (400) to the other end may be shorter than or equal to the length (X) of the airbag cushion (300) in the direction in which the airbag cushion (300) is deployed.

[0067] When the airbag cushion (300) is deployed, the passenger seated in the seat can come into contact with the airbag cushion (300) by moving toward the airbag cushion (300). Since the airbag cushion (300) absorbs impact when the passenger comes into contact with it, if the position of the airbag cushion (300) is not fixed with strong force, a phenomenon may occur where it is pushed in the direction of the external force applied by the passenger. If the airbag cushion (300) is pushed, not only can the passenger not be effectively protected, but the passenger seated on the opposite side may be injured by the pushed airbag cushion (300).

[0068] In the roof airbag (10) of a vehicle according to one embodiment, when the airbag cushion (300) is deployed, the length (Y) of the tether (400) is shorter than or equal to the length (X) of the airbag cushion (300), so the direction in which the airbag cushion (300) deploys can be effectively controlled. If the length (Y) of the tether (400) is too long, it is not possible to limit the airbag cushion (300) from deploying in an unintended direction.

[0069] In addition, since the length (Y) of the tether (400) is shorter than or equal to the length (X) of the airbag cushion (300), the tether (400) becomes taut when the airbag cushion (300) is deployed, thereby stably supporting the airbag cushion (300). When the airbag cushion (300) is inflated and deployed, if the length (Y) of the tether (400) is too long, the tension supporting the airbag cushion (300) is insufficient, and the airbag cushion (300) may be pushed away by the movement of the occupant (P). The tether (400) can have sufficient tension to maintain its position even when an external force is applied while the airbag cushion (300) is deployed toward the occupant.

[0070] Also, referring to FIG. 5, the airbag cushion (300) of the roof airbag (10) of a vehicle according to one embodiment may include a plurality of guide portions (302).

[0071] A plurality of guide sections (302) can guide the flow of the expansion gas when the expansion gas flows into the interior of the airbag cushion (300). By controlling the flow of the expansion gas through the guide sections (302), the manner in which the airbag cushion (300) deploys or the overall shape of the airbag cushion (300) can be controlled. The guide sections (302) may be seam lines formed on the airbag cushion (300) or certain patterns formed on the outer side of the airbag cushion (300).

[0072] A plurality of guide portions (302) may have a shape that extends in the width direction (D2) of the airbag cushion (300). The length of the guide portion (302) may be shorter than the width length of the airbag cushion (300). Additionally, a plurality of guide portions (302) may be spaced apart at a predetermined interval in the length direction (D3) of the airbag cushion (300). The length direction (D3) may be the direction in which the airbag cushion (300) expands when deployed.

[0073] The guide portion (302) can adjust the shape of the airbag cushion (300) to match the body shape of the occupant contacting the airbag cushion (300). Since the guide portion (302) extends in the width direction (D2) of the airbag cushion (300), the occupant's body can come into contact with the airbag cushion (300) from both ends of the guide portion (302) toward the center due to a collision. Since a contracting force in the width direction (D2) acts on the airbag cushion (300), the airbag cushion (300) can contract in the width direction (D2). When the airbag cushion (300) contracts in the width direction (D2), the guide portion (302) can also contract in the width direction. At this time, if the guide portion (302) contracts in correspondence with the body structure of the occupant contacting the airbag cushion (300), the shape of the airbag cushion (300) can correspond to the body shape of the occupant. Therefore, since the airbag cushion (300) is adjusted to a shape suitable for the occupant's body structure, it can effectively absorb shock.

[0074] A roof airbag (10) of a vehicle according to one embodiment may include an airflow path (A), which is a path through which expansion gas flows inside an airbag cushion (300). The expansion gas flows along the airflow path (A), and the airbag cushion (300) may be expanded by the expansion gas flowing along the airflow path (A).

[0075] Since the airbag cushion (300) is deployed as the expansion gas flows along the airflow path (A), the airflow path (A) can determine the manner in which the airbag cushion (300) is deployed. That is, the deployment operation of the airbag cushion (300) can be determined by controlling the airflow path (A).

[0076] The airflow path (A) may include a first airflow path (A1) through which the expansion gas flows to the outer edge of the airbag cushion (300) when the expansion gas is discharged, and a second airflow path (A2) through which the expansion gas branches off from the first airflow path (A1) and flows to the center of the airbag cushion (300). The first airflow path (A1) may correspond to the shape of the outer edge of the airbag cushion (300).

[0077] An airflow path (A) can be formed by a guide section (302). In other words, an airflow path (A) can be formed by guiding the flow of the expansion gas within the airbag cushion (300) through the guide section (302). When a plurality of guide sections (302) are spaced apart at a predetermined interval in the longitudinal direction (D3) of the airbag cushion (300), the expansion gas supplied into the airbag cushion (300) can form a first airflow path (A1) that flows along the outer side of the guide section (302) and a second airflow path (A2) in which the expansion gas flows from the first airflow path (A1) to between the plurality of guide sections (302).

[0078] When the inflator (200) is operated, the expansion gas can flow along the first airflow path (A1) and the second airflow path (A2). First, as the expansion gas flows through the first airflow path (A1), the outer edge of the airbag cushion (300) can be deployed, and as the expansion gas flows through the second airflow path (A2), the airbag cushion (300) can be deployed to a size sufficient to protect the occupant.

[0079] Accordingly, when a collision occurs, the roof airbag (10) of the vehicle according to the present embodiment allows the airbag cushion (300) to be rapidly deployed toward the occupant by first allowing the expansion gas to flow along the outer edge of the airbag cushion (300). As the outer shape of the airbag cushion (300) is formed, the expansion gas simultaneously flows toward the center of the airbag cushion (300), thereby allowing the airbag cushion (300) to form a thickness sufficient to protect the occupant.

[0080] Those skilled in the art related to the embodiments described above will understand that the invention may be implemented in modified forms without departing from the essential characteristics of the description. Therefore, the disclosed methods should be considered in an illustrative rather than a restrictive sense. The scope of the invention is defined by the claims, not by the foregoing description, and all variations within the scope of equivalence should be interpreted as being included in the invention. Explanation of the symbols

[0081] 10: Vehicle roof airbag 100: Bracket 110: Fastening member 200: Inflator 201: Clamp band 210: First inflator 220: Second inflator 300: Airbag cushion 310: First chamber 320: Second chamber 400: Tether 410: First tether 420: Second tether A: Airflow path A1: First airflow path A2: Second airflow path

Claims

Claim 1 A roof airbag positioned on the roof of a vehicle and deployed into the interior space of the vehicle, comprising: a bracket provided on the roof; an inflator connected to the bracket and discharging expansion gas upon operation; an airbag cushion folded and provided on an airbag cover connected to the bracket, which deploys into the interior space of the vehicle by supplying expansion gas from the inflator; and a tether that supports the airbag cushion, with one end fixed to the roof side and the other end connected to the airbag cushion, so that when the airbag cushion deploys, the airbag cushion deploys toward the seat; and a fastening member that penetrates the bracket and the airbag cover and is mounted on the roof, wherein the airbag cushion includes a first chamber and a second chamber provided on both sides of the fastening member, and the space of the airbag cover is partitioned into two sides by the fastening member, and the first chamber and the second chamber are respectively accommodated in the partitioned space. Claim 2 In claim 1, the airbag cushion comprises a first chamber that deploys toward one side in the vehicle width direction and a second chamber that deploys toward the other side in the vehicle width direction, for a vehicle roof airbag. Claim 3 A roof airbag of a vehicle according to paragraph 2, wherein the tether comprises a first tether, one end of which is fixed at a distance from the center of the vehicle width direction in the roof and the other end of which is connected to the first chamber, and a second tether, one end of which is fixed at a distance from the center of the vehicle width direction in the roof and the other end of which is connected to the second chamber. Claim 4 In paragraph 2, the roof airbag of a vehicle, wherein the inflator comprises a first inflator connected to the first chamber and a second inflator connected to the second chamber. Claim 5 In paragraph 4, the roof airbag of a vehicle, wherein the first inflator and the second inflator operate independently of each other. Claim 6 delete Claim 7 A roof airbag of a vehicle, wherein the length of the tether is shorter than or equal to the length of the airbag cushion in paragraph 1. Claim 8 A roof airbag of a vehicle according to claim 1, wherein the airbag cushion includes a plurality of guide portions that guide the flow of the expansion gas inside. Claim 9 In claim 8, the plurality of guide portions extend in the width direction of the airbag cushion and are spaced apart at a predetermined interval in the length direction of the airbag cushion, for a vehicle roof airbag. Claim 10 A roof airbag of a vehicle according to claim 1, further comprising: an airflow path through which the expansion gas flows when the expansion gas is supplied from the inflator into the interior of the airbag cushion; wherein the airflow path comprises a first airflow path that flows to the outer edge of the airbag cushion when the expansion gas is discharged from the inflator, and a second airflow path that branches off from the first airflow path and flows to the center of the airbag cushion. Claim 11 A roof airbag of a vehicle, wherein, in claim 10, the airbag cushion includes a plurality of guide portions that extend in the width direction of the airbag cushion and are spaced apart at a predetermined interval in the length direction of the airbag cushion, the first airflow path is formed outside the plurality of guide portions, and the second airflow path is formed between the plurality of guide portions. Claim 12 In claim 1, the above bracket is a roof airbag of a vehicle installed on the cross panel of the roof.

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