Side airbag device

Abstract

A side airbag device according to an embodiment of the present invention may include: an armrest positioned between the driver's seat and the passenger seat and having a deployment line on the side facing the occupant; an electromagnet module connected to an airbag controller and positioned inside the armrest to open and close the deployment line; an airbag module installed inside the armrest and including an airbag cushion that deploys outward through the deployment line opened by the electromagnet module; and a bracket module installed inside the armrest to support the airbag module and control the deployment direction of the airbag cushion through rotational drive.

Description

Technology Field

[0001] The present invention relates to a side airbag device, and more specifically, to a side airbag device installed in a center armrest positioned between the driver's seat and the passenger seat. Background Technology

[0003] Generally, airbag systems protect occupants by rapidly inflating the airbag cushion, which is compressed, through the instantaneous release of gas in response to a signal from a collision sensor when a car accident occurs. These include a driver's airbag system mounted on the steering wheel, a passenger airbag system mounted on the upper side of the glove box, a curtain airbag system mounted along the roof rail, and a side airbag system mounted on the side of the seat.

[0004] Among these, the side airbag device is a mechanism in which an airbag cushion inflates and deploys from the side of the seatback toward the front to protect the occupant's side from the chest to the buttocks.

[0005] However, side airbag units interfere with the armrests positioned on the sides of the seatbacks, making installation on the sides of the seat difficult; consequently, problems arise where the airbag cushion is obstructed by the armrest during deployment or its deployment direction is distorted. The problem to be solved

[0007] The present invention aims to solve the aforementioned problems, and the objective of the present invention is to provide a side airbag device capable of resolving the problem of the airbag cushion being obstructed by an armrest or the deployment direction being twisted during deployment.

[0008] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0010] A side airbag device according to an embodiment of the present invention may include: an armrest positioned between the driver's seat and the passenger seat and having a deployment line on the side facing the occupant; an electromagnet module connected to an airbag controller and positioned inside the armrest to open and close the deployment line; an airbag module installed inside the armrest and including an airbag cushion that deploys outward through the deployment line opened by the electromagnet module; and a bracket module installed inside the armrest to support the airbag module and control the deployment direction of the airbag cushion through rotational drive.

[0011] The above-mentioned deployment line includes a first deployment line provided on the upper side relative to the vehicle floor surface, a second deployment line provided in the middle of the side, and a third deployment line provided on the lower side, and the electromagnet module can control any one of the first to third deployment lines to open and the others to close.

[0012] The above electromagnet module includes a first electromagnet and a second electromagnet positioned on each side with the deployment line in between and facing each other, and may be configured to control the closing or opening of the deployment line by generating an attractive or repulsive force between the first electromagnet and the second electromagnet according to the direction of the current supplied from the airbag controller.

[0013] The above electromagnet module can be controlled such that when any one of the first to third expansion lines is controlled to open, the direction of the current supplied to the first electromagnet and the direction of the current supplied to the second electromagnet are the same, and when controlled to close, the direction of the current supplied to the first electromagnet and the direction of the current supplied to the second electromagnet are different.

[0014] The above bracket module may include a motor connected to the airbag controller and driven according to a signal transmitted from the airbag controller, and a mounting bracket connected to the rotation axis of the motor and on which the airbag module is mounted.

[0015] The above mounting bracket rotates by the drive of the motor to face the deployment line among the first to third deployment lines that is controlled to open by the electromagnet module, and can adjust the deployment direction so that the airbag cushion deploys through the corresponding deployment line.

[0016] The above mounting bracket is arranged in a structure that extends along the longitudinal direction of the armrest within the armrest, and one end of the longitudinal direction of the mounting bracket can be connected to the rotation axis.

[0017] The above mounting bracket may include a first body to which the airbag module is fixed and a second body that is bent at an end of the first body and connected to the rotation axis.

[0018] The airbag module may further include an inflator that generates gas to inflate the airbag cushion, and a cover that houses the inflator and the airbag cushion in a folded state.

[0019] The above airbag cushion is formed by joining two panels flat and sewing their perimeters, and can have a structure that extends vertically when deployed. Effects of the invention

[0021] According to an embodiment of the present invention, a side airbag device can be provided that solves the problem of the airbag cushion being obstructed by an armrest or the deployment direction being twisted during deployment.

[0022] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0024] FIG. 1 is a schematic diagram showing the state in which a side airbag device according to an embodiment of the present invention is installed on an armrest. FIG. 2 is a schematic drawing showing the deployment line and electromagnet module provided in the armrest of FIG. 1. FIGS. 3A and 3B are schematic diagrams illustrating a method of controlling the closing and opening of a deployment line through an electromagnet module. FIG. 4 is a schematic diagram showing an airbag module of the side airbag device of FIG. 1. FIG. 5 is a side view schematically showing the state in which the airbag cushion is deployed in the side airbag device of FIG. 1. FIG. 6 is a front view schematically showing the deployed state of the airbag cushion of FIG. 5. FIGS. 7A and FIGS. 7B are schematic drawings showing a bracket module of the side airbag device of FIG. 1. FIGS. 8A and 8B are schematic drawings showing the state in which the mounting bracket in the bracket module is rotated clockwise and counterclockwise. FIGS. 9 to 11 are schematic drawings showing that a bracket module controls the deployment direction of an airbag cushion through rotational drive. Specific details for implementing the invention

[0025] The present invention is susceptible to various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the invention, a second component may be named a first component, and similarly, a first component may be named a second component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0026] 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. On the other hand, 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.

[0027] In the description of the embodiments, where one component is described as being formed "on or under" another component, "on or under" includes both cases where the two components are in direct contact with each other and cases where one or more other components are positioned indirectly between the two components. Furthermore, when expressed as "on or under," it may include the meaning of a downward direction as well as an upward direction relative to one component.

[0028] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, 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.

[0029] Unless otherwise defined, all terms used herein, including technical or scientific terms, shall 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 shall be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0030] Hereinafter, embodiments will be described in detail with reference to the attached drawings, provided that identical or corresponding components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0031] FIG. 1 is a schematic diagram showing a state in which a side airbag device according to an embodiment of the present invention is installed on an armrest, and FIG. 2 is a schematic diagram showing a deployment line and an electromagnet module provided on the armrest of FIG. 1.

[0032] Referring to the drawings, the side airbag device (1) according to an embodiment of the present invention includes an armrest (10) and an electromagnet module (20). , It may include an airbag module (30) and a bracket module (40).

[0033] The armrest (10) may be mounted on the side of the seatback (SB) of the driver's seat and configured to extend toward the front of the vehicle. In an embodiment, the armrest (10) may be a center armrest positioned between the driver's seat and the passenger seat.

[0034] The armrest (10) may have a structure with a cross-sectional shape that is approximately square, and may be provided with a deployment line (11) on the side facing the occupant.

[0035] In this embodiment, the armrest (10) is exemplified as a center armrest mounted on the side of the seat back (SB), but is not limited thereto. In the embodiment, the armrest (10) may be a center console positioned between the driver's seat and the passenger seat.

[0036] The deployment line (11) is a part that is torn open to facilitate the deployment of the airbag module (30) described later, and can be provided in a structure that extends along the longitudinal direction of the armrest (10) from the side of the armrest (10). In an embodiment, the deployment line (11) can be provided by being sewn.

[0037] The development line (11) can be provided in multiple numbers, at least one or more.

[0038] In an embodiment, the deployment line (11) may include a first deployment line (11a) provided on the upper side relative to the vehicle floor surface, a second deployment line (11b) provided in the middle of the side, and a third deployment line (11c) provided on the lower side.

[0039] As shown in the drawing, the first development line (11a) may be positioned at an angle (θ) of approximately 45 degrees upward from the center of the armrest (10) with respect to the second development line (11b), and the third development line (11c) may be positioned at an angle (θ) of approximately 45 degrees downward.

[0040] In this embodiment, three deployment lines (11) are exemplified as being provided on the side of the armrest (10), but this is not limited thereto, and the number of deployment lines (11) can be varied depending on the embodiment.

[0041] The airbag controller (ACU) can control the airbag cushion (31) of the airbag module (30) to be deployed through any one of the first deployment line (11a) to the third deployment line (11c), and in this case, the part where the airbag cushion (31) is deployed can be opened by the electromagnet module (20).

[0042] The electromagnet module (20) is connected to the airbag controller (ACU) and may be positioned inside the armrest (10) to selectively open and close the deployment line (11).

[0043] In an embodiment, the electromagnet module (20) may include a first electromagnet (21) and a second electromagnet (22) that are respectively positioned on both sides with the deployment line (11) in between and face each other.

[0044] Referring to the drawing, the first electromagnet (21) and the second electromagnet (22) can be configured to control the closing or opening of the deployment line (11) by generating an attractive or repulsive force depending on the direction of the current supplied from the airbag controller (ACU).

[0045] FIGS. 3a and 3b schematically illustrate a method of controlling the closing and opening of the deployment line (11) through the electromagnet module (20).

[0046] Referring to the drawing, if the direction of the current supplied to the first electromagnet (21) and the second electromagnet (22) is different from each other, an attractive force is generated, and accordingly, the development line (11) can be controlled to be closed. And, if the direction of the current supplied to the first electromagnet (21) and the second electromagnet (22) is the same from each other, a repulsive force is generated, and accordingly, the development line (11) can be controlled to be open.

[0047] As shown in the drawing, the electromagnet module (20) is provided to each of the first deployment line (11a), the second deployment line (11b), and the third deployment line (11c), and is connected to each airbag controller (ACU) to be configured to control one of the first deployment line (11a) to the third deployment line (11c) to open and the others to close.

[0048] For example, when the first expansion line (11a) is controlled to open, the remaining second expansion line (11b) and third expansion line (11c) can be controlled to close. In this case, the electromagnet module (20) provided to the first expansion line (11a) is controlled so that the direction of the current supplied to the first electromagnet (21) and the direction of the current supplied to the second electromagnet (22) are the same, and the first expansion line (11a) is opened through the repulsive force generated between the first electromagnet (21) and the second electromagnet (22). And, the electromagnet modules (20) provided to the second development line (11b) and the third development line (11c), respectively, are controlled so that the direction of the current supplied to the first electromagnet (21) and the direction of the current supplied to the second electromagnet (22) are different, and the second development line (11b) and the third development line (11c) are kept in a closed state through the attractive force generated between the first electromagnet (21) and the second electromagnet (22).

[0049] Which of the first deployment line (11a) to the third deployment line (11c) is controlled to be open is determined by the airbag controller (ACU) according to the collision accident conditions occurring in the vehicle, and accordingly, the corresponding electromagnet module (20) can be controlled to be open and the remaining electromagnet module (20) can be controlled to be closed.

[0050] In this way, the closing and opening of the deployment line (11) can be controlled by utilizing the attractive and repulsive forces generated between the first electromagnet (21) and the second electromagnet (22). In particular, by configuring the deployment line (11) to be torn open using the repulsive force, serious quality problems such as delayed deployment and non-deployment can be prevented, which are issues associated with a structure where the seam is torn only by the expansion force of the conventional airbag cushion, namely, when the resistance of the seam is high during airbag deployment and the seam is not sufficiently torn.

[0051] In this embodiment, the direction of the current supplied to the first electromagnet (21) and the second electromagnet (22) is different from each other, and the unfolding line (11) is controlled to a closed state through the attractive force generated between the first electromagnet (21) and the second electromagnet (22), but this is not limited thereto. For example, it is also possible to configure the device to supply current only to the electromagnet module (20) of the unfolding line (11) controlled to an open state, and not supply current to the electromagnet module (20) of the unfolding line (11) controlled to a closed state, and to maintain the closed state through the resistance of the sewing.

[0052] The airbag module (30) can be installed inside the armrest (10). Figure 4 schematically shows the airbag module (30).

[0053] In an embodiment, the airbag module (30) may include an airbag cushion (31) that inflates upon a vehicle collision and deploys outward through a deployment line (11), an inflator (32) that generates gas to inflate the airbag cushion (31), and a cover (33) that houses the inflator (32) and the airbag cushion (31) in a folded state inside.

[0054] The inflator (32) can be configured to generate gas in response to a signal from the airbag controller (ACU) when a vehicle collision occurs.

[0055] The inflator (32) may be formed in the shape of a roughly round bar, and may contain a gas generator and an ignition device inside. An outlet (32a) for discharging gas may be provided at the end of the inflator (32).

[0056] The airbag cushion (31) is inflated as gas discharged from the inflator (32) is introduced, and is deployed to the outside of the armrest (10) through the deployment line (11) and positioned between the occupant and the armrest (10) to protect the occupant's side.

[0057] The airbag cushion (31) can be deployed to the outside through any one of the first deployment line (11a) to the third deployment line (11c) selected by the airbag controller (ACU).

[0058] The airbag cushion (31) can be formed by placing two panels (31a) cut into a predetermined shape flat against each other and sewing the perimeter together. In the embodiment, the panels (31a) may be made of fabric, but are not limited thereto.

[0059] The airbag cushion (31) has a structure that extends vertically to protect the occupant's head, shoulders, chest, and pelvis when deployed, and may have multiple chambers inside corresponding to each part.

[0060] The airbag cushion (31) can be rolled up and tightly folded, and can be stored wrapped in a cover (33) together with an inflator (32) in a folded state.

[0061] The airbag module (30) is mounted on the bracket module (40), and the bracket module (40) is installed inside the armrest (10) to support the airbag module (30) inside the armrest (10).

[0062] FIG. 5 is a side view schematically showing the state in which the airbag cushion (31) is deployed in the side airbag device (1), and FIG. 6 is a front view schematically showing the state in which the airbag cushion (31) is deployed.

[0063] As shown in FIGS. 5 and 6, when a vehicle collision occurs, the airbag cushion (31) of the airbag module (30) inflates and can be deployed outward from inside the armrest (10) toward the driver's seat. At this time, the deployment line (11) provided in the armrest (10) is torn open by the repulsive force generated between the first electromagnet (21) and the second electromagnet (22), thereby allowing the airbag cushion (31) to be easily deployed. That is, unlike conventional side airbag devices which are installed on the side of the seat back (SB), in the present invention, they are installed inside the armrest (10), thereby resolving the problem of conventional airbags not deploying properly because they are blocked by the armrest (10).

[0064] With the airbag cushion (31) deployed outward, the bracket module (40) can support the airbag cushion (31) so that it is positioned on the inner side facing the driver's seat of the armrest (10). Accordingly, the airbag cushion (31) may be composed of a portion (A1) positioned on the upper part of the armrest (10) when viewed from the side, a portion (A2) positioned on the lower part of the armrest (10), and a portion (A3) that overlaps with the armrest (10).

[0065] In this way, as the airbag cushion (31) and the armrest (10) overlap, the airbag cushion (31) is not pushed into the interior of the vehicle (i.e., toward the passenger seat) and can fully support the driver. That is, the armrest (10) itself becomes a support structure and supports the airbag cushion (31).

[0066] FIGS. 7a and 7b are schematic drawings showing a bracket module in the side airbag device of FIG. 1, and FIGS. 8a and 8b are schematic drawings showing the state in which a mounting bracket in the bracket module is rotated clockwise and counterclockwise.

[0067] Referring to FIGS. 7 and 8, the bracket module (40) may include a motor (41) connected to an airbag controller (ACU) and a mounting bracket (42) connected to the rotation axis (41a) of the motor (41).

[0068] The motor (41) can be driven according to a signal transmitted from the airbag controller (ACU).

[0069] As shown in the drawing, the rotation axis (41a) of the motor (41) can rotate clockwise or counterclockwise. In the embodiment, the clockwise and counterclockwise directions may correspond to the driver's seat direction and the passenger seat direction, based on the view from the front of the vehicle.

[0070] An airbag module (30) can be mounted on the mounting bracket (42). The mounting bracket (42) is arranged in a structure that extends along the longitudinal direction of the armrest (10) inside the armrest (10), and a rotation axis (41a) can be connected to one end of the mounting bracket (42) in the longitudinal direction.

[0071] The mounting bracket (42) may include a first body (42a) that extends along the longitudinal direction of the armrest (10) to which the airbag module (30) is fixed, and a second body (42b) that is bent at the end of the first body (42a) and connected to a rotation axis (41a).

[0072] The bracket module (40) can control the deployment direction of the airbag cushion (31) through rotational drive. Specifically, the mounting bracket (42) can control the deployment direction so that the airbag module (30) rotates to face the deployment line (11) which is controlled to open by the electromagnet module (20) among the first deployment line (11a) to the third deployment line (11c) by the drive of the motor (41), and the airbag cushion (31) deploys through the corresponding deployment line (11).

[0073] FIGS. 9 to 11 schematically show that the bracket module (40) controls the deployment direction of the airbag cushion (31) through rotational drive.

[0074] The driving of the motor (41), that is, the rotational direction of the rotation axis (41a), can be controlled according to a signal transmitted from the airbag controller (ACU). In an embodiment, the airbag controller (ACU) can transmit a signal to the motor (41) in response to the location where the collision is detected when a collision of the vehicle occurs.

[0075] As shown in FIG. 9, when a side collision is detected on the passenger side, the mounting bracket (42) can adjust the direction of deployment so that the airbag module (30) rotates toward the third deployment line (11c) in conjunction with the motor (41) driven by the airbag controller (ACU), thereby allowing the airbag cushion (31) to deploy through the third deployment line (11c).

[0076] That is, the mounting bracket (42) is rotated downward at an angle of approximately 45 degrees relative to the center of the side so that the airbag module (30) is positioned toward the third deployment line (11c), thereby controlling the airbag cushion (31) to deploy outward through the third deployment line (11c). In this case, the electromagnet module (20) provided to the third deployment line (11c) is controlled by the airbag controller (ACU) to generate a repulsive force between the first electromagnet (21) and the second electromagnet (22), and accordingly, the third deployment line (11c) is controlled to open so that the airbag cushion (31) can deploy quickly without resistance. And, the first deployment line (11a) and the second deployment line (11b) are controlled to close.

[0077] When a collision load (P) is applied to the passenger side, the driver (i.e., the driver) moves toward the passenger side, which is the direction of the collision, due to inertia. By rotating the mounting bracket (42) toward the third deployment line (11c), the airbag cushion (31) is deployed so that it is tilted toward the driver side at an angle of approximately 45 degrees through the third deployment line (11c). Accordingly, the upper part of the airbag cushion (31) is positioned so that it is tilted toward the driver's head, thereby mitigating the force that causes the driver's head to move toward the passenger side. Consequently, the impact applied to the driver is reduced, allowing the driver to be effectively protected.

[0078] And, the passenger in the front seat (i.e., the passenger) can be protected by an unillustrated near-side airbag device or curtain airbag device, etc. In addition, the driver and the passenger can be prevented from colliding with each other through the airbag cushion (31) of the side airbag device (1) according to an embodiment of the present invention.

[0079] As shown in FIG. 10, when a side collision is detected on the driver's side, the mounting bracket (42) can adjust the direction of deployment so that the airbag module (30) is rotated toward the first deployment line (11a) in conjunction with a motor (41) driven by an airbag controller (ACU), thereby allowing the airbag cushion (31) to be deployed through the first deployment line (11a).

[0080] That is, the mounting bracket (42) is rotated upward at an angle of approximately 45 degrees relative to the center of the side so that the airbag module (30) is positioned toward the first deployment line (11a), thereby controlling the airbag cushion (31) to deploy outward through the first deployment line (11a). In this case, the electromagnet module (20) provided to the first deployment line (11a) is controlled by the airbag controller (ACU) to generate a repulsive force between the first electromagnet (21) and the second electromagnet (22), and accordingly, the first deployment line (11a) is controlled to be open so that the airbag cushion (31) can deploy quickly without resistance. Then, the second deployment line (11b) and the third deployment line (11c) are controlled to be closed.

[0081] When a collision load (P) is applied to the driver's side, the passenger (i.e., the passenger) moves toward the driver's side, which is the direction of the collision, due to inertia. By rotating the mounting bracket (42) toward the first deployment line (11a), the airbag cushion (31) is deployed so that it is tilted toward the passenger side at an angle of approximately 45 degrees through the first deployment line (11a). Accordingly, the upper part of the airbag cushion (31) is positioned so that it is tilted toward the head of the passenger, thereby restraining the passenger's head from moving toward the driver's side at an early stage. Consequently, the impact applied to the passenger is reduced, allowing the passenger to be effectively protected.

[0082] And, the occupant of the driver's seat (i.e., the driver) can be protected by an unillustrated near-side airbag device or curtain airbag device, etc. In addition, the driver and the passenger can be prevented from colliding with each other through the airbag cushion (31) of the side airbag device (1) according to an embodiment of the present invention.

[0083] As shown in FIG. 11, when a collision is detected on the front side of the vehicle, the mounting bracket (42) can be rotated in conjunction with the motor (41) so that the airbag module (30) faces the second deployment line (11b), thereby adjusting the deployment direction so that the airbag cushion (31) is deployed through the second deployment line (11b).

[0084] That is, the mounting bracket (42) is rotated to the side center so that the airbag module (30) is positioned toward the second deployment line (11b), thereby controlling the airbag cushion (31) to deploy approximately vertically upward through the second deployment line (11b). In this case, the electromagnet module (20) provided to the second deployment line (11b) is controlled by the airbag controller (ACU) to generate a repulsive force between the first electromagnet (21) and the second electromagnet (22), thereby controlling the second deployment line (11b) to open so that the airbag cushion (31) can deploy quickly without resistance. And, the first deployment line (11a) and the third deployment line (11c) are controlled to close.

[0085] In this way, the side airbag device (1) according to the present invention can be configured to be installed on the center armrest (10) as a center side airbag device and to deploy from the armrest (10) to the driver's seat upon a vehicle collision, thereby solving the problem in which the airbag cushion (31) cannot fully deploy due to being blocked by the armrest (10) when installed on the side of the conventional seat back (SB).

[0086] In addition, when the airbag cushion (31) is deployed, the armrest (10) acts as a support structure to prevent the airbag cushion (31) from being pushed into the vehicle interior, thereby providing the advantage of protecting the occupant more reliably.

[0087] In particular, the armrest (10) is equipped with a plurality of deployment lines (11), and in response to the collision position of the vehicle, the bracket module (40) moves the airbag module (30) to an appropriate position through rotation, and in conjunction with this, the electromagnet module (20) opens the corresponding deployment line (11), thereby allowing the airbag cushion (31) to deploy quickly without resistance, thus improving the safety of the occupant.

[0088] Although the present invention has been described above with reference to embodiments thereof, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention as described in the following claims. Furthermore, differences related to such modifications and changes should be interpreted as being included within the scope of the present invention as defined in the appended claims. Explanation of the symbols

[0090] 1: Side airbag system 10: Armrest 11: Development line 11a: First development line 11b: 2nd development line 11c: 3rd development line 20: Electromagnet Module 21: First Electromagnet 22: Second electromagnet 30: Airbag module 31: Airbag cushion 32: Inflator 32a: Discharge port 33: Cover 40: Bracket module 41: Motor 41a: Rotation axis 42: Mounting bracket 42a: First body 42b: Second body

Claims

Claim 1 A side airbag device comprising: an armrest positioned between the driver's seat and the passenger seat and having a deployment line on the side facing the occupant; an electromagnet module connected to an airbag controller and positioned inside the armrest to open and close the deployment line; an airbag module installed inside the armrest and including an airbag cushion that deploys outward through the deployment line opened by the electromagnet module; and a bracket module installed inside the armrest to support the airbag module and control the deployment direction of the airbag cushion through rotational drive. Claim 2 A side airbag device according to claim 1, wherein the deployment line comprises a first deployment line provided on the upper side with respect to the vehicle floor surface, a second deployment line provided in the middle of the side, and a third deployment line provided on the lower side, and wherein the electromagnet module controls any one of the first to third deployment lines to open and controls the others to close. Claim 3 A side airbag device according to claim 2, wherein the electromagnet module comprises a first electromagnet and a second electromagnet positioned on each side with the deployment line in between and facing each other, and is configured to control the closing or opening of the deployment line by generating an attractive or repulsive force between the first electromagnet and the second electromagnet according to the direction of the current supplied from the airbag controller. Claim 4 A side airbag device according to claim 3, wherein the electromagnet module is controlled such that when any one of the first to third expansion lines is controlled to open, the direction of the current supplied to the first electromagnet and the direction of the current supplied to the second electromagnet are the same, and when controlled to close, the direction of the current supplied to the first electromagnet and the direction of the current supplied to the second electromagnet are different. Claim 5 A side airbag device according to paragraph 2, wherein the bracket module comprises a motor connected to the airbag controller and driven according to a signal transmitted from the airbag controller, and a mounting bracket connected to the rotation axis of the motor and on which the airbag module is mounted. Claim 6 A side airbag device according to claim 5, wherein the mounting bracket rotates by the driving of the motor to face the deployment line among the first to third deployment lines that is controlled to open by the electromagnet module, and controls the deployment direction so that the airbag cushion deploys through the corresponding deployment line. Claim 7 A side airbag device according to claim 5, wherein the mounting bracket is arranged in a structure extending along the longitudinal direction of the armrest within the armrest, and the rotation axis is connected to one end of the longitudinal direction of the mounting bracket. Claim 8 A side airbag device according to claim 7, wherein the mounting bracket comprises a first body to which the airbag module is fixed and a second body that is bent at the end of the first body and connected to the rotation axis. Claim 9 A side airbag device according to claim 1, wherein the airbag module further comprises an inflator that generates gas to inflate the airbag cushion, and a cover that houses the inflator and the airbag cushion in a folded state. Claim 10 A side airbag device according to claim 1, wherein the airbag cushion is formed by joining two panels in a flat state and sewing the perimeter together, and has a structure that extends vertically when deployed.

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