Structure for assisting opening and closing of lower door

Abstract

A structure for assisting opening and closing of a lower door includes a lower door having an upper end portion configured to be rotated open with respect to a bottom surface of a vehicle body, and a rotating unit configured to be fixed to the bottom surface of the vehicle body and configured to be rotated in opposite directions to each other to assist opening and closing of the lower door. The present invention is capable of assisting driving force of the lower door when the lower door is opened and also capable of minimizing injury to a passenger and damage to the vehicle when a side collision occurs with the lower door in a closed state.

Description

TECHNICAL FIELD

[0001] The present invention relates to a structure for assisting in opening and closing a lower door. BACKGROUND

[0002] There are various types of vehicle doors. Among the various types of vehicle doors, exemplary examples include a swing door mainly applied to passenger cars, a sliding door mainly applied to medium van, and a hatchback door mainly applied to van tailgate and recreational vehicles (RV).

[0003] On the other hand, a special purpose vehicle (PBV) that expands a living space is becoming a mobile tool of the future. For example, when PBVs configured as a shoe store and a clothing store, respectively, are docked with an activity center, the activity center becomes a shopping center. The expandability of the function and design is very large according to the purpose of the PBV. The PBV is a new type of travel that is not a private vehicle or a bus such as public transportation, but is used as a flexible space to change the purpose of the activity center according to the purpose of the PBV docked on the activity center.

[0004] In future vehicles, tailgates are applied not only to the rear of the vehicle but also to the side of the vehicle, thereby allowing passengers to enter / exit from the side of the vehicle and allowing cargo to be loaded. Among the various types of tailgates, the opening of a clamshell door that divides an upper portion and a lower portion from the middle is less energy-consuming than the opening and closing of a single-sash large tailgate, and occupies less rear space, making the clamshell door the focus. In addition, the clamshell door also provides a space to sit on the lower door, or allows luggage to be placed closer to the bumper.

[0005] The ramp system of the clamshell door is configured to perform the opening and closing function of the lower door and perform a foothold function that allows passengers to get off the vehicle comfortably. Due to its layout, a main shaft driver capable of opening the ramp system needs to push the lower end of the ramp system to open the lower door. At this time, since it is necessary to push a point close to the hinge axis of the lower door, a high actuation force is required. In addition, a vehicle without a B-pillar requires a structure that reduces the amount of intrusion of the door when the vehicle undergoes a side collision.

[0006] Korean Patent Application Publication No. 10-2019-0068287 can provide additional information related to the present invention. SUMMARY

[0007] The present invention relates to a structure for assisting in opening and closing a lower door. The specific embodiment relates to a structure that is capable of assisting in the driving force of the lower door when the lower door is opened and is also capable of minimizing injury to passengers and damage to the vehicle when a side collision occurs with the lower door in a closed state.

[0008] Accordingly, embodiments of the present application can solve problems occurring in the related art, and embodiments of the present application provide a structure for assisting in opening and closing a lower door configured to assist in opening and closing the lower door by assisting in a driving force of the lower door via a rotation unit when the lower door is opened.

[0009] Further, embodiments of the present application provide a structure for assisting in opening and closing a lower door configured to prevent deformation of the lower door by inserting the rotation unit into a side surface of the lower door when a vehicle having a door including an upper door and the lower door is subjected to a side collision in a closed state.

[0010] Embodiments of the present application are not limited to the above-described embodiments, and other embodiments of the present application and advantages of the present application not mentioned can be understood by the following description and will become more clearly apparent by exemplary embodiments of the present application. Further, embodiments of the present application can be implemented by means represented within the scope of the present application and combinations thereof.

[0011] According to one embodiment of the present application, there is provided a structure for assisting in opening and closing a lower door, the structure including the lower door, wherein an upper end portion of the lower door is rotated to be opened with respect to a bottom surface of a vehicle body; and a rotation unit fixed to the bottom surface of the vehicle body and configured to be rotated in opposite directions to assist in opening and closing of the lower door.

[0012] Further, the rotation unit can include a hook connection portion configured to be rotated in opposite directions; a rotation shaft positioned at the hook connection portion; a first hook extended from a first side of the hook connection portion and bent downward toward an inner side of the lower door in a closed state of the lower door; and a second hook extended from a second side of the hook connection portion and formed such that a first end portion of the second hook faces a lower end portion of an inner surface of the lower door in the closed state of the lower door.

[0013] Further, the structure for assisting in opening and closing the lower door can further include a groove formed on the inner surface of the lower door and into which the first end of the first hook is inserted.

[0014] Further, the structure for assisting in opening and closing the lower door can further include a vehicle body guide accommodated in the vehicle body below the rotation shaft, a hook guide connected to a second end portion of the second hook, and a spring provided on an outer peripheral surface of the vehicle body guide and the hook guide such that a first end portion thereof is in contact with the bottom surface of the vehicle body and a second end portion thereof is in contact with the second end portion of the second hook.

[0015] Further, the rotation shaft can include a torsion spring connected to a side surface of the hook connection portion, and a fixed shaft passing through the hook connection portion.

[0016] Further, the spring can be configured to be extended to push the second hook when the lower door is opened.

[0017] Further, the spring can be configured to be compressed when the lower door is closed and the hook guide can be configured to move along the vehicle body guide.

[0018] Further, when the lower door switches to the open state, the hook connection portion can rotate such that the first end portion of the second hook pushes the lower end portion of the inner surface of the lower door, and the first end portion of the first hook can be released from the groove.

[0019] Further, when the lower door switches to the closed state, the hook connection portion can rotate such that the first end portion of the second hook comes into contact with the lower end portion of the inner surface of the lower door, and the first end portion of the first hook can be inserted into the groove.

[0020] Further, the torsion spring can be configured to limit the amount of rotation of the hook connection portion.

[0021] Further, the structure for assisting in opening and closing the lower door can further include a driving unit located inside the vehicle and configured to apply a driving force to the lower door, and a control unit configured to drive the driving unit in response to a signal for opening and closing the lower door.

[0022] Embodiments of the present application can achieve the following effects based on the above-described embodiments and the configurations, combinations, and relationships described later.

[0023] When the lower door is opened, the driving force for the lower door can be assisted by pushing the lower door via the rotation unit.

[0024] Further, when the vehicle including the upper door and the lower door is subjected to a side collision in the closed state of the vehicle door, the structure for assisting in opening and closing the lower door can prevent the lower door from being deformed by inserting the rotation unit into the inner surface of the lower door. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and other advantages of the present application will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a view illustrating an open state of a lower door of a structure for assisting in opening and closing the lower door according to an embodiment of the present application;

[0027] Figure 2 is a sectional view illustrating a structure for assisting in opening and closing a lower door in a closed state according to an embodiment of the present application;

[0028] Figure 3 is a view illustrating a rotation shaft of a structure for assisting in opening and closing a lower door according to an embodiment of the present application; and

[0029] Figure 4 is a sectional view illustrating a structure for assisting in opening and closing a lower door in an open state according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present application will be described in greater detail with reference to the accompanying drawings. The embodiments of the present application can be modified in various forms, and the scope of the present application should not be construed as being limited to the following embodiments. The embodiments are provided to more fully explain the present application to those skilled in the art.

[0031] In addition, the terms "part" and "unit" described in the specification refer to a unit processing at least one function or operation, which can be implemented by hardware or a combination of hardware.

[0032] In addition, the term "door" described in the specification includes a door that opens in the front-rear direction of the vehicle, and a door that opens in the opposite direction in the width direction of the vehicle. The present application will be described with respect to a door that opens in the width direction of the vehicle.

[0033] In addition, the term "closed state" described in the specification refers to a state in which the lower door 200 is closed, and the term "open state" refers to a state in which the lower door 200 is completely opened.

[0034] In addition, in the specification, when a part is positioned "on" or "above" another part, this includes not only when the one part is positioned "directly above" the other part, but also when the other part is positioned between the two parts. In addition, in the present specification, when a part is positioned "below" or "under" another part, this includes not only when the part is positioned "directly below" the other part, but also when the other part is positioned between the two parts.

[0035] In addition, in the specification, the "upper end portion" refers to a direction that moves to the top in the height direction according to the drawings, and the "lower end portion" refers to a direction that moves to the bottom in the height direction according to the drawings.

[0036] In addition, in the entire detailed description, some components are referred to as first, second, etc. in an effort to distinguish the components from each other as they have the same configuration, but in the following description, such as order is not limiting.

[0037] Figure 1 is a view showing a lower door open state of a structure for assisting in opening and closing a lower door according to an embodiment of the present application.

[0038] Reference Figure 1 , the vehicle door can include an upper door 100 and a lower door 200. The lower end portion of the upper door 100 can be rotatably opened with respect to the first end portion of the roof. The lower door 200 can be disposed adjacent to the lower end portion of the upper door 100 to be opened. The upper end portion of the lower door 200 can be rotatably opened with respect to the bottom surface of the vehicle body. In one embodiment, the lower door 200 can be a flip type door.

[0039] The lower door 200 can be opened by applying a driving force of the driving unit 400. When the lower door 200 is completely opened, a passenger can enter / exit via the lower door. More preferably, when the passenger enters / exists, the outer surface of the lower door 200 is in contact with the outer floor surface, so that convenience and support stability of the entering / exit can be achieved.

[0040] The lower door 200 can be opened by applying a driving force of the driving unit 400. When the lower door 200 is completely opened, a passenger can enter / exit via the lower door. More preferably, when the passenger enters / exists, the outer surface of the lower door 200 is in contact with the outer floor surface, so that convenience and support stability of the entering / exit can be achieved.

[0041] Figure 2 is a sectional view illustrating a structure for assisting in opening and closing a lower door in a closed state according to an embodiment of the present application.

[0042] Reference Figure 2 , the structure for assisting in opening and closing a lower door according to an embodiment of the present application can be configured to include a rotating unit 300, a driving unit 400, and a control unit 500.

[0043] The rotating unit 300 can be fixed to the bottom surface of the vehicle body. More preferably, at least one rotating unit 300 can be provided on the bottom surface of the vehicle body and configured to rotate in opposite directions to each other.

[0044] The rotating unit 300 can include a hook connection portion 310, a rotating shaft 320, a first hook 330, and a second hook 340. The hook connection portion 310 can be configured to rotate in opposite directions to each other. More preferably, the hook connection portion 310 can rotate in opposite directions to each other with respect to the rotating shaft 320 located at the hook connection portion 310.

[0045] The hook connection portion 310 can rotate in a counterclockwise direction when the lower door 200 is opened, as Figure 2 indicated, and rotate in a clockwise direction when the lower door 200 is closed.

[0046] The first hook 330 can be formed by extending from a first side of the hook connection portion 310. The first hook 330 can have a shape bent downward toward the inside of the lower door 200 in a closed state. In one embodiment, the first hook 330 can extend and be configured to be folded at a predetermined angle from the hook connection portion 310 and formed to be bent at a first end portion thereof. In another embodiment, the first hook 330 can extend in a curve from the hook connection portion 310 and be formed to be bent at a first end portion thereof.

[0047] The recess 210 can be formed on the inner surface of the lower door 200. More preferably, the first end portion of the first hook 330 can be inserted into the recess 210 in the closed state. The recess 210 can have a shape in which the first end portion of the first hook 330 is inserted without interference.

[0048] The recess 210 can be formed to correspond to the length of the first end portion of the first hook 330 inserted. In the fully closed state, the first end portion of the first hook 330 can be in contact with the end portion of the recess 210, so that the amount of movement of the lower door 200 can be limited and the amount of deformation of the lower door 200 when a side collision of the vehicle occurs can be limited.

[0049] The second hook 340 can be formed by extending from the second side of the hook connection portion 310. In the closed state, the first end portion of the second hook 340 can be formed as a lower end portion facing the inner side of the lower door 200. More preferably, in the closed state, the inclined inner surface of the lower door 200 and the first end portion surface of the second hook 340 can be in contact with each other at an angle corresponding to each other, so that the surface connection state can be maintained.

[0050] The structure for assisting in opening and closing the lower door according to the embodiment of the present application can be configured to further include a body guide 610, a hook guide 620, and a spring 630. The body guide 610 can be fixed to the bottom surface of the vehicle body below the rotation shaft 320. The hook guide 620 can be connected to the second end portion of the second hook 340. The first end portion of the hook guide 620 can be connected to the second end portion of the second hook 340 and can be configured to move along the body guide 610. More specifically, the body guide 610 and the hook guide 620 can be cylindrical in shape, and can be formed such that the diameter of the hook guide 620 is greater than the diameter of the body guide 610. The hook guide 620 can be configured to move without interference along the body guide 610.

[0051] The spring 630 can be provided on the outer peripheral surface of the body guide 610 and the hook guide 620. The first end portion of the spring 630 can be in contact with the bottom surface of the vehicle body and the second end portion of the spring 630 can be in contact with the second end portion of the second hook 340. The body guide 610, the hook guide 620, and the spring 630 can extend in a curved line.

[0052] In the closed state, the spring 630 can maintain a compressed state. When the door is switched from the open state to the closed state, and the inner surface of the lower door 200 pushes the first end portion of the second hook 340, the hook guide 620 can be rotated in the clockwise direction as shown in Figure 2 At this time, the hook guide 620 can be rotationally moved in the clockwise direction along the body guide 610.

[0053] In the open state, the spring 630 can maintain a released state. When the door is switched from the closed state to the open state, the hook guide 620 and the second hook 340 are rotated in a counterclockwise direction, as shown in FIG. 6B, so that the first end portion of the second hook 340 can push the inner surface of the lower door 200. At this time, the hook guide 620 can be rotationally moved along the body guide 610 in the counterclockwise direction. Figure 2

[0054] The elastic force of the spring 630 can be configured to work with the opening and closing of the lower door 200. More preferably, the spring 630 is compressed in the closed state, so that an elastic reaction force can be stored. When the door is switched from the closed state to the open state, the driving force of the driving unit 400 can be assisted by the elastic reaction force stored in the spring 630. In other words, the first end portion of the second hook 340 can be configured to push the inner surface of the lower door 200 by the elastic restoring force of the spring 630.

[0055] More specifically, in the closed state, the portion of the first end portion of the second hook 340 in contact with the inner surface of the lower door 200 can be located inside the hinge point of the lower door 200. When the door is switched from the closed state to the open state, the elastic force of the spring 630 can impart momentum to the first end portion of the second hook 340. The restoring force of the spring 630 is set in the same direction in which the lower door 200 is initially rotated open, and the first end portion of the second hook 340 can impart momentum to the inner surface of the lower door 200, so that the driving force to open the door can be assisted.

[0056] The spring 630 can be configured so that its position value does not change during compression or restoration by the body guide 610 and the hook guide 620.

[0057] The driving unit 400 is located inside the vehicle and can apply a driving force to the lower door 200. In one embodiment, the driving unit 400 can include an actuator and a main shaft. The actuator is configured to apply a driving force to the main shaft, and the main shaft is configured to be moved in the longitudinal direction thereof by the actuator. The main shaft can be configured to extend in the longitudinal direction thereof when the driving force is applied by the actuator. The lower door 200 can be configured to open at a predetermined angle when the main shaft extends in the longitudinal direction thereof.

[0058] The control unit 500 can drive the driving unit 400 in response to a signal to open and close the lower door 200. In one embodiment, when the lower door 200 opening signal is applied, the control unit 500 can control the actuator so that the main shaft extends in the longitudinal direction thereof. In addition, when the lower door 200 closing signal is applied, the control unit 500 can control the actuator so that the main shaft is shortened in the longitudinal direction thereof.

[0059] ​When the control unit 500 operates the driving unit 400 to close the lower door 200, the main shaft can be shortened in its longitudinal direction. When the lower door 200 is completely closed, the spring 630 can be compressed. At this time, the hook guide 620 can be configured to move along the body guide 610.

[0060] When the lower door 200 is switched to the closed state, the hook connection portion 310 is rotated so that the first end portion of the second hook 340 can come into contact with the lower end portion of the inner surface of the lower door 200. In addition, the hook connection portion 310 can be rotated so that one end portion of the first hook 330 is inserted into the groove 210.

[0061] When the door is switched from the open state to the closed state, the inner surface of the lower door 200 first pushes the first end portion of the second hook 340, and the hook connection portion 310 is rotated so that the first end portion of the first hook 330 can be inserted into the groove 210.

[0062] More preferably, when the lower door 200 is switched from the open state to the closed state and the lower end portion of the inner surface of the lower door 200 comes into contact with the second hook 340, the hook connection portion 310 can be rotated in the clockwise direction as shown in Figure 2 At this time, the spring 630 can be configured to be gradually compressed. The hook connection portion 310 is rotated so that the first end portion of the first hook 330 can face the beginning portion of the groove 210. When the lower door 200 is completely closed, the first hook 330 can be completely inserted into the groove 210. The first end portion of the second hook 340 can be surface-connected to the lower end portion of the inside of the lower door 200.

[0063] Figure 3 is a view showing the rotating shaft 320 of a structure for assisting in opening and closing a lower door according to an embodiment of the present application.

[0064] Referring to Figure 3 , the rotating shaft 320 can be configured to include a torsion spring 321 and a fixed shaft 322. The torsion spring 321 can be connected to the side surface of the hook connection portion 310. More preferably, the elastic force of the torsion spring 321 can be configured to work together with the rotation of the hook connection portion 310. The torsion spring 321 can be configured to limit the amount of rotation of the hook connection portion 310.

[0065] In the closed state, the torsion spring 321 can store an elastic reaction force. When the door is switched from the closed state to the open state, the elastic reaction force of the torsion spring 321 can assist the driving force. In addition, the torsion spring 321 can limit the excessive rotation of the hook connection portion 310 in the counterclockwise direction as shown in Figure 4 .

[0066] The fixed shaft 322 can be formed to pass through the hook connection portion 310. More preferably, the fixed shaft 322 can fix the hook connection portion 310 to the vehicle body by passing through the hook connection portion 310 and the vehicle body. The hook connection portion 310 can be configured to rotate in opposite directions with respect to the fixed shaft 322.

[0067] Figure 4 is a sectional view illustrating a structure for assisting in opening and closing a lower door in an open state according to an embodiment of the present application.

[0068] Reference Figure 4 When the control unit 500 operates the driving unit 400 to open the lower door 200, the main shaft can be extended in its longitudinal direction. When the lower door 200 is completely opened, the spring 630 can be completely extended. That is, the spring can be configured to extend to push the second hook 340. At this time, the hook guide 620 can be configured to move along the vehicle body guide 610.

[0069] When the lower door 200 is switched to the open state, the hook connection portion 310 is rotated so that the first end portion of the second hook 340 pushes the lower end portion of the inner surface of the lower door 200 so that the first end portion of the first hook 330 can be configured to be released from the groove 210.

[0070] More preferably, when the lower door 200 is switched from the closed state to the open state so that the first end portion of the second hook 340 pushes the lower end portion of the inner surface of the lower door 200, the hook connection portion 310 can be rotated in the counterclockwise direction as shown in Figure 4 At this time, the spring 630 can be configured to be gradually released. The hook connection portion 310 is rotated so that the first end portion of the first hook 330 can be released from the groove 210.

[0071] As described above, the embodiment of the present application provides a structure for assisting in opening and closing a lower door. The structure of the embodiment of the present application is configured to assist in driving force when the lower door 200 is opened by the rotating unit 300, and also configured to prevent the lower door 200 from being deformed when a side collision occurs in the closed state.

[0072] The above detailed description is merely exemplary of the application. Furthermore, the above-described description has described example embodiments of the application, and the application can be used in various other combinations, modifications and environments. That is, the application can be changed and modified in various ways within the concept of the contents disclosed in the specification and the equivalent range and / or in the technical or knowledge in the art. The described embodiments describe the best mode of implementing the concept of the application, and various modifications required to apply the application to specific fields and uses are possible. Therefore, the above detailed description of the application does not limit the application to the disclosed embodiments. Furthermore, the appended claims should be interpreted to include other embodiments.

Claims

1.A structure comprising: a lower door having an upper end portion configured to be rotated open with respect to a bottom surface of a vehicle body; and a rotation unit configured to be fixed to the bottom surface of the vehicle body and configured to be rotated in opposite directions to each other to assist opening and closing of the lower door, wherein the rotation unit comprises: a hook connection portion configured to be rotated in opposite directions to each other; a rotation shaft at the hook connection portion; a first hook extending from a first side of the hook connection portion and curved downward toward an inner side of the lower door in a closed state of the lower door; and a second hook extending from a second side of the hook connection portion, wherein a first end portion of the second hook faces a lower end portion of an inner surface of the lower door in the closed state of the lower door, the structure further comprising: a vehicle body guide configured to be accommodated in the vehicle body below the rotation shaft; a hook guide connected to a second end portion of the second hook; and a spring configured to be disposed on an outer peripheral surface of the vehicle body guide and the hook guide, wherein a first end portion of the spring is configured to be in contact with the bottom surface of the vehicle body, and a second end portion of the spring is in contact with the second end portion of the second hook, wherein the vehicle body guide, the hook guide, and the spring extend in a curved line. 2.The structure according to claim 1, further comprising a groove on an inner surface of the lower door, wherein the first end portion of the first hook is configured to be inserted into the groove. 3.The structure according to claim 2, wherein when the lower door switches to an open state, the hook connection portion is configured to be rotated such that the first end portion of the second hook pushes the lower end portion of the inner surface of the lower door, and the first end portion of the first hook is released from the groove. 4.The structure according to claim 2, wherein when the lower door switches to a closed state, the hook connection portion is configured to be rotated such that the first end portion of the second hook is in contact with the lower end portion of the inner surface of the lower door, and the first end portion of the first hook is inserted into the groove. 5.The structure according to claim 1, wherein the spring is configured to be extended to push the second hook when the lower door is opened. 6.The structure according to claim 1, wherein the spring is configured to be compressed when the lower door is closed and the hook guide is configured to move along the vehicle body guide when the lower door is closed. 7.The structure according to claim 1, wherein the rotation shaft comprises: a torsion spring connected to a side surface of the hook connection portion; and a fixed shaft passing through the hook connection portion, wherein the torsion spring is connected to the fixed shaft. 8.The structure according to claim 7, wherein the torsion spring is configured to limit an amount of rotation of the hook connection portion. 9.A structure comprising: a lower door having an upper end portion configured to be rotated open with respect to a bottom surface of a vehicle body; a rotation unit configured to be fixed to the bottom surface of the vehicle body and configured to be rotated in opposite directions to each other to assist opening and closing of the lower door; a driver configured to be positioned at an inner side of the vehicle body and configured to apply a driving force to the lower door; and ​ ​ a controller configured to drive the driver in response to a signal to open or close the lower door, wherein the rotation unit includes: a hook connection portion configured to rotate in opposite directions to each other; a rotation shaft located at the hook connection portion; a first hook extending from a first side of the hook connection portion and curved downward toward an inner side of the lower door in a closed state of the lower door; and a second hook extending from a second side of the hook connection portion, wherein a first end portion of the second hook faces a lower end portion of an inner surface of the lower door in the closed state of the lower door, the structure further includes: a body guide configured to be accommodated in the body below the rotation shaft; a hook guide connected to a second end portion of the second hook; and a spring configured to be disposed on an outer peripheral surface of the body guide and the hook guide, wherein a first end portion of the spring is configured to be in contact with a bottom surface of the body, and a second end portion of the spring is in contact with the second end portion of the second hook, wherein the body guide, the hook guide, and the spring extend in a curve. 10.The structure of claim 9, further comprising a groove on an inner surface of the lower door, wherein the first end portion of the first hook is configured to be inserted into the groove. 11.The structure of claim 10, wherein when the lower door switches to an open state, the hook connection portion is configured to rotate such that the first end portion of the second hook pushes the lower end portion of the inner surface of the lower door, and the first end portion of the first hook is released from the groove. 12.The structure of claim 10, wherein when the lower door switches to a closed state, the hook connection portion is configured to rotate such that the first end portion of the second hook is in contact with the lower end portion of the inner surface of the lower door, and the first end portion of the first hook is inserted into the groove. 13.The structure of claim 9, wherein the rotation shaft includes: a torsion spring connected to a side surface of the hook connection portion; and a fixed shaft passing through the hook connection portion, wherein the torsion spring is connected to the fixed shaft. 14.A vehicle comprising: a body; a lower door combined to the body and having an upper end portion configured to be rotated open with respect to a bottom surface of the body; and a rotation unit fixed to the bottom surface of the body and configured to rotate in opposite directions to each other to assist opening and closing of the lower door, wherein the rotation unit includes: a hook connection portion configured to rotate in opposite directions to each other; a rotation shaft located at the hook connection portion; a first hook extending from a first side of the hook connection portion and curved downward toward an inner side of the lower door in a closed state of the lower door; and a second hook extending from a second side of the hook connection portion, wherein a first end portion of the second hook faces a lower end portion of an inner surface of the lower door in the closed state of the lower door, the vehicle further includes: a body guide accommodated in the body below the rotation shaft; a hook guide connected to a second end portion of the second hook; and ​ ​ a spring disposed on an outer circumferential surface of the body guide and the hook guide, wherein a first end of the spring is in contact with a bottom surface of the body and a second end of the spring is in contact with a second end of the second hook; a driver positioned at an inner side of the body and configured to apply a driving force to the lower door; and a controller configured to drive the driver in response to a signal to open or close the lower door, wherein the body guide, the hook guide, and the spring extend in a curved line.

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