Decorative structure, decorative unit, and vehicle

Abstract

The present invention provides a trim structure, a trim unit, and a vehicle. The trim structure includes a trim unit configured to be positioned on a surface of a lower door and perform impact absorption and load support, wherein the trim unit includes a first layer region configured to absorb energy and a second layer region configured to withstand a collision. The trim unit further includes a trim panel forming an outer surface of the trim unit, a first impact member formed on an inner side of the trim panel, an absorption member positioned in the first layer region, a spring member positioned on an inner side of the absorption member, a second impact member formed on an inner side of the first impact member, and a damper spring positioned in the second layer region.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a trim structure for a lower door. BACKGROUND

[0002] Generally, a tailgate is an opening / closing door installed at the rear end of a truck-type vehicle, a van, a recreational vehicle, etc. to load cargo into the rear of the vehicle body.

[0003] The tailgate is installed to facilitate the driver's entry into a cargo compartment formed in the vehicle cabin. The tailgate installed at the rear end of the vehicle not only facilitates loading and unloading of cargo into and from the cargo compartment, but also enables passengers to get on and off the vehicle through the rear of the vehicle.

[0004] In addition, in future vehicles, the tailgate can be installed not only at the rear of the vehicle but also at the front of the vehicle, thereby enabling loading and unloading of cargo and getting on and off the vehicle through both the front and the rear of the vehicle.

[0005] However, in the case where the tailgate is configured to be opened vertically, a gap is formed between the outside ground and the tailgate, thereby causing inconvenience in getting on and off the vehicle. To solve this problem, the tailgate can be configured such that one end thereof comes into contact with the outside ground when opened. However, even in this case, the contact area with the outside ground is small, so the tailgate cannot stably support a load and is easily subjected to impact.

[0006] Meanwhile, a bumper can be provided on the lower end of the tailgate to absorb impact generated when the vehicle collides. However, since the bumper can absorb impact to a limited extent, a separate structure needs to be designed to minimize impact load.

[0007] The above information disclosed in this Background section is only for increasing the understanding of the background of the present disclosure, therefore, the above information can contain information that does not form the related art known to those of ordinary skill in the art.

[0008] Korean Patent Registration No. 10-0383943 discloses a subject matter related to the subject matter of the present disclosure. SUMMARY

[0009] Embodiments of the present disclosure solve problems associated with the related art. The present disclosure relates to a trim structure for a lower door. Specific embodiments relate to a trim structure for a lower door that can minimize injury to an occupant and damage to a vehicle in the event of a collision and support a load when the occupant enters or exits the vehicle through the door.

[0010] One embodiment of the present disclosure provides a trim structure for a lower door configured such that a trim unit is divided into two regions, i.e., a first layer region and a second layer region, which are connected to each other via an impact member and an energy absorbing member.

[0011] Another embodiment of the present disclosure provides a trim structure for a lower door configured such that an inclined trim unit contacts an outside ground when the lower door is fully opened.

[0012] The features of the present disclosure are not limited to the above-described features, and other features not mentioned herein will be clearly understood by those skilled in the art from the following description, and will become apparent with reference to the embodiments of the present disclosure. In addition, the features of the present disclosure can be implemented by the components described in the appended claims and combinations thereof.

[0013] A trim structure for a lower door for implementing the features of the present disclosure includes the following configuration.

[0014] In one aspect, an embodiment of the present disclosure provides a trim structure for a lower door including a trim unit located on one surface of the lower door to perform impact absorption and load support, the trim unit including a first layer region configured to absorb energy and a second layer region configured to withstand a collision.

[0015] In one preferred embodiment, the trim unit can include a trim panel configured to form an outer surface of the trim unit, a first impact member formed on an inner side of the trim panel, an absorbing member located in the first layer region, a spring member located on an inner side of the absorbing member, a second impact member formed on an inner side of the first impact member, and a damping spring located in the second layer region.

[0016] In another preferred embodiment, the first impact member can include a first mountain portion and a first valley portion continuously formed, and the spring member can be in contact with the first valley portion.

[0017] In still another preferred embodiment, the second impact member can include a second mountain portion and a second valley portion continuously formed, one end of the damping spring can be in contact with the first mountain portion, and the opposite end of the damping spring can be in contact with the second mountain portion.

[0018] In still another preferred embodiment, the spring member and the damping spring can be alternately located at positions corresponding to the first mountain portion and the first valley portion.

[0019] In still another preferred embodiment, the first mountain portion, the first valley portion, the second mountain portion, and the second valley portion can each have a flat portion.

[0020] In yet another preferred embodiment, the first impact member and the second impact member can be made of high-strength steel or advanced high-strength steel.

[0021] In yet another preferred embodiment, the trim structure can further include a driving unit configured to apply a driving force to the trim unit, a trim hinge configured to connect an upper portion of the trim unit to the lower door, and a trim lever connected to a lower portion of the trim unit, and the trim unit can be tilted from the lower door in a manner that a lower end of the trim unit rotates about the trim hinge.

[0022] In yet another preferred embodiment, the driving unit can include an actuator configured to apply a driving force, and a main shaft configured to move in a longitudinal direction by the actuator, and at least a portion of the trim unit can be tilted to a predetermined angle when the main shaft extends in the longitudinal direction.

[0023] Other aspects and preferred embodiments of the present disclosure are discussed below.

[0024] It should be understood that the term "vehicle" or "vehicular" or other similar terminology used herein includes a broad definition of motor vehicles, such as passenger cars, including sports utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including various boats and ships, aircraft, etc., and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel (e.g., fuel produced from resources other than petroleum) vehicles. When referred to herein, hybrid vehicles are vehicles having two or more power sources, such as gasoline power and electric power.

[0025] The above and other features of the embodiments of the present disclosure are discussed below. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other features of the present disclosure will now be described in detail with reference to certain example embodiments thereof, which are illustrated in the accompanying drawings, giving by way of illustration only, therefore, the present disclosure is not limited thereby, in the drawings:

[0027] Figure 1 is a view showing a closed state of a lower door having a trim structure according to an embodiment of the present disclosure;

[0028] Figure 2 is a sectional view of a trim structure for a lower door according to an embodiment of the present disclosure;

[0029] Figure 3 is a sectional view of a first layer area of a trim structure for a lower door according to an embodiment of the present disclosure;

[0030] Figure 4is a cross-sectional view of a second layer region of a trim structure for a lower door according to an embodiment of the disclosure; and

[0031] Figure 5 is a view showing an inclined state of a trim structure for a lower door according to an embodiment of the disclosure.

[0032] It is to be understood that the drawings are not necessarily to scale, as the emphasis generally being on the principles of the disclosure. The specific design features of the embodiments of the disclosure as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the particular intended application and use environment.

[0033] In the drawings, like reference numerals refer to like parts throughout the several views of the drawings. Embodiments of the disclosure can also be modified variably and can have several distinct new features. In addition, embodiments of the disclosure can have various modifications, substitutions and changes made therein without departing from the scope of the disclosure. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings. However, the disclosure can be implemented in many different forms, and the disclosure should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the disclosure will be thorough and complete, and will more fully convey the scope of the disclosure to those skilled in the art.

[0035] The terms "part", "unit", and "member" used in the specification refer to a unit for performing at least one function or operation, and the at least one function or operation can be implemented using a hardware component, a software component, or a combination thereof.

[0036] In addition, the term "first layer region" used in the specification is an energy absorption region formed between the trim panel 130 and the first impact member 140, and the term "second layer region" is a collision receiving region formed between the first impact member 140 and the second impact member 170. The first layer region 110 and the second layer region 120 can be arranged in order.

[0037] In addition, the term "door" used in the specification includes both a front door and a rear door, and one end of the door will be focused on in the following description.

[0038] Figure 1 is a view showing a closed state of a lower door having a trim structure according to an embodiment of the disclosure.

[0039] The door can include an upper door and a lower door, the upper door being configured to rotate and open in a height direction with respect to a first end of the upper door, which is adjacent to a roof of the vehicle, and an opposite second end of the upper door, which is close to a rear of the vehicle, and the lower door being disposed adjacent to the second end of the upper door. The lower door can be rotatable and openable with respect to a lower surface of the vehicle body.

[0040] When the lower door is completely opened, the occupant can enter or exit the vehicle. More preferably, the decorative unit 100 located on one surface of the lower door can be in contact with the outside ground when the occupant enters or exits the vehicle, thereby ensuring convenience and support stability when entering or exiting the vehicle.

[0041] The decorative unit 100 can be located on one surface of the lower door, and at least a portion of the lower end of the decorative unit can be inclined from the lower door. More preferably, the decorative unit 100 can include a center portion and side portions formed at both opposite ends of the decorative unit. When the decorative unit 100 is inclined, only the side portions of the decorative unit can be inclined, or only the center portion of the decorative unit can be inclined. In another embodiment, the center portion and the side portions of the decorative unit 100 can be inclined together.

[0042] The driving unit 200 can be positioned adjacent to one end of the decorative unit 100, and can provide a driving force to the decorative unit 100. More preferably, the driving unit 200 can incline the decorative unit 100. The driving unit 200 can extend in a longitudinal direction in response to a pressure with which the decorative unit 100 is inclined by a user, and can apply a tension to the decorative unit 100. When the driving unit 200 applies the tension to the decorative unit 100, the lower end of the decorative unit 100 can be inclined to a predetermined angle with respect to the lower door.

[0043] In addition, when an additional driving force is applied by the driving unit 200 to completely open the lower door, the inclined decorative unit 100 can be substantially parallel to the ground, thereby increasing support stability.

[0044] Figure 2 is a cross-sectional view of a decorative structure for a lower door according to an embodiment of the disclosure, Figure 3 is a cross-sectional view of a first layer area of a decorative structure for a lower door according to an embodiment of the disclosure, and Figure 4 is a cross-sectional view of a second layer area of a decorative structure for a lower door according to an embodiment of the disclosure.

[0045] Reference Figures 2 to 4 A decorative structure for a lower door according to an embodiment of the disclosure can include a decorative unit 100 located on one surface of the lower door and performing impact absorption and load support. The decorative unit 100 can include a first layer area 110 for absorbing energy and a second layer area 120 for bearing a collision.

[0046] Further, the trim unit 100 can include a trim panel 130 forming an outer surface of the trim unit 100, a first impact member 140 formed at an inner side of the trim panel 130, an absorption member 150 located in the first layer area 110, a spring member 160 located at an inner side of the absorption member 150, a second impact member 170 formed at an inner side of the first impact member 140, and a damping spring 180 located in the second layer area 120.

[0047] When the lower door is in a closed state, in the case of a collision at the front or rear of the vehicle, the trim unit 100 can perform impact absorption and load support. The trim unit 100 can be located on the front side or rear side of the lower door and can form the farthest protruding part of the outer surface of the vehicle, thereby functioning as a primary protection member in the case of a collision of the vehicle.

[0048] The trim unit 100 can include a first layer area 110 for absorbing energy and a second layer area 120 for withstanding a collision. The first layer area 110 can include a trim panel 130, an absorption member 150, and a spring member 160. The second layer area 120 can include a first impact member 140, a second impact member 170, and a damping spring 180.

[0049] The trim panel 130 can extend in the width direction of the vehicle and can form an outer surface of the trim unit 100. The trim panel 130 can be the farthest protruding part of the vehicle, thus functioning as a primary protection member in the case of a collision at the front or rear of the vehicle. Further, the trim panel 130 can contact the outside ground when the lower door is fully opened. The trim panel 130 can have a curved shape in order to secure support stability when contacting the outside ground. Further, the trim panel 130 can be made of a reinforced plastic material to prevent damage due to repeated collisions and contacts. However, the present disclosure is not limited thereto.

[0050] The spring member 160, the first impact member 140, the damping spring 180, and the second impact member 170 can be sequentially stacked at the inner side of the trim panel 130. Further, the absorption member 150 for absorbing energy can be formed between the trim panel 130 and the first impact member 140, thereby mitigating an impact in the case of a collision of the vehicle or when the trim panel 130 contacts the outside ground due to the opening of the lower door, and increasing support stability when a passenger gets in or out of the vehicle.

[0051] The first impact member 140 can be formed to extend in a width direction of the vehicle inside the trim panel 130. Also, the first impact member 140 can include first peak portions 141 and first valley portions 142 which are continuously formed. More preferably, the first impact member 140 can be configured such that the first peak portions 141 and the first valley portions 142 are alternately formed in the entire surface of the first impact member 140.

[0052] The first peak portions 141 and the first valley portions 142 can have flat portions. Accordingly, the first impact member 140 can have a relatively high strength, and can stably support the spring member 160 and the damping spring 180. Each flat portion can be formed between an end point of a corresponding one of the first peak portions 141 and a start point of a corresponding one of the first valley portions 142, or can be formed between an end point of a corresponding one of the first valley portions 142 and a start point of a corresponding one of the first peak portions 141.

[0053] The second impact member 170 can be formed to extend in a width direction of the vehicle inside the first impact member 140. Also, the second impact member 170 can include second peak portions 171 and second valley portions 172 which are continuously formed. More preferably, the second impact member 170 can be configured such that the second peak portions 171 and the second valley portions 172 are alternately formed in the entire surface of the second impact member 170.

[0054] The second peak portions 171 and the second valley portions 172 can have flat portions. Accordingly, the second impact member 170 can have a relatively high strength, and can stably support the damping spring 180. Each flat portion can be formed between an end point of a corresponding one of the second peak portions 171 and a start point of a corresponding one of the second valley portions 172, or can be formed between an end point of a corresponding one of the second valley portions 172 and a start point of a corresponding one of the second peak portions 171.

[0055] The first impact member 140 and the second impact member 170 can be made of high strength steel (HSS) or advanced high strength steel (AHSS). The AHSS can conceptually include ultra high strength steel (UHSS). The first impact member 140 and the second impact member 170 can be connected to each other by a welding bonding method. The first impact member 140 and the second impact member 170 can also be connected to an inner panel of a vehicle body by the welding bonding method.

[0056] The absorption member 150 can be located in the first layer region 110 to absorb energy. The trim panel 130 and the absorption member 150 can be coupled to each other by a heat staking method. A plurality of spring members 160 can be formed inside the absorption member 150. More preferably, the spring members 160 can be formed to be in contact with the first valley portions 142 and an inner surface of the trim panel 130.

[0057] The spring member 160 can be used to absorb collision energy in the event of a collision of the vehicle and to support a load in a dispersed manner when a passenger gets in or out of the vehicle. The spring member 160 can be fastened to the trim panel 130 by a screw coupling method. More preferably, each spring member 160 can be formed on a corresponding one of two opposite side portions of the trim unit 100, and two spring members 160 can be formed on a central portion of the trim unit 100.

[0058] The damping spring 180 can absorb energy in response to a collision. A plurality of damping springs 180 can be formed such that one end of each damping spring 180 is in contact with a corresponding one of the first peaks 141, and the opposite end of each damping spring 180 is in contact with a corresponding one of the second peaks 171. More preferably, one end of each damping spring 180 can have a predetermined area to be coupled to the inner surface of the first impact member 140 by a bolt coupling method, and the opposite end of each damping spring 180 can be in contact with and fixed to the opposite end of the second impact member 170.

[0059] The spring member 160 and the damping spring 180 can be alternately disposed such that the spring member 160 is located at a position corresponding to the first valley 142 of the first impact member 140, and the damping spring 180 is located at a position corresponding to the first peak 141 of the first impact member 140. The spring force of the spring member 160 and the collision energy damping force of the damping spring 180 can be balanced, and thus, the first layer region 110 and the second layer region 120 can effectively achieve collision buffering and load support.

[0060] In the event of a collision of the vehicle, the spring member 160 can primarily absorb collision energy. In the event that the amount of applied energy exceeds the amount that the spring member 160 is capable of absorbing, the damping spring 180 can absorb collision energy. In another embodiment of the disclosure, the damping spring 180 can primarily absorb collision energy, and when the amount of applied energy exceeds the amount that the damping spring 180 is capable of absorbing, the spring member 160 can absorb collision energy.

[0061] Figure 5 FIG. 4 is a view illustrating a tilted state of a trim structure for a lower door according to an embodiment of the disclosure.

[0062] Reference Figure 5 The trim structure for a lower door according to an embodiment of the disclosure can further include a driving unit 200 configured to apply a driving force to the trim unit 100, a trim hinge 300 configured to connect an upper portion of the trim unit 100 to the lower door, and a trim lever 400 connected to a lower portion of the trim unit 100. The trim unit 100 can be tilted from the lower door in a manner that the lower end of the trim unit rotates about the trim hinge 300.

[0063] The driving unit 200 can include an actuator 210 configured to apply a driving force and a main shaft 220 configured to move in a longitudinal direction by the actuator 210. When the main shaft 220 extends in the longitudinal direction, at least a portion of the trim unit 100 can be inclined to a predetermined angle.

[0064] The trim hinge 300 can be formed at an upper portion of the trim unit 100 to connect the trim unit 100 to the lower door. One or more trim hinges 300 can be formed on the upper portion of the trim unit 100, and the hinges are spaced apart from each other. The lower end of the trim unit 100 can rotate about the trim hinge 300 and can be inclined from the lower door.

[0065] The trim rod 400 connected to the driving unit 200 can be formed at a lower portion of the trim unit 100. The trim rod 400 can be formed at a position corresponding to the driving unit 200. When the driving unit 200 applies tension, the trim rod 400 can incline the trim unit 100 to a predetermined angle. One end of the trim rod 400 can be connected to the driving unit 200, and the opposite end of the trim rod can be connected to the rear surface of the trim unit 100.

[0066] The angle at which the trim unit 100 is inclined with respect to the lower door can be 4° to 8°, and preferably can be 6°. When the lower door is fully opened, the trim unit 100 can be enabled to make contact with the outside ground without a gap by adjusting the inclination angle of the trim unit 100, thereby increasing support stability.

[0067] When one end of the main shaft 220 moves by 33 mm to 39 mm (for example, 36 mm), the main shaft can apply tension to one end of the trim rod 400, and the opposite end of the trim rod 400 can incline the trim unit 100. In this case, the inclination angle of the trim unit 100 with respect to the lower door can be 4° to 8°, and preferably can be 6°.

[0068] The driving unit 200 can extend in the longitudinal direction and can apply a driving force to the lower door and the trim unit 100. More preferably, the driving unit 200 can include an actuator 210 configured to apply a driving force and a main shaft 220 configured to move in a longitudinal direction by the actuator 210. When the actuator 210 applies a driving force to the main shaft, the main shaft 220 can extend in the longitudinal direction.

[0069] In summary, the trim structure for the lower door according to the embodiment of the disclosure is configured such that the trim unit is divided into two regions, i.e., a first layer region and a second layer region, the two regions are connected to each other via the impact member and the energy absorption member 150, and the absorption member 150 effectively absorbs and mitigates impact energy in the event of a collision at the rear of the vehicle, thereby preventing damage to the vehicle and ensuring the safety of the occupant.

[0070] As is apparent from the foregoing description, the decorative structure for a lower door according to embodiments of the disclosure has the following effects.

[0071] The decorative unit can be divided into two regions, i.e., a first layer region and a second layer region, which are connected to each other via an impact member and an energy absorbing member, and the absorbing member can effectively absorb and mitigate impact energy in the event of a collision at the rear of the vehicle, thereby preventing damage to the vehicle and ensuring the safety of the occupant.

[0072] In addition, when the lower door is fully opened, the inclined decorative unit can contact the outside ground, thereby improving the convenience of the occupant and increasing support stability.

[0073] The foregoing detailed description of the present disclosure is merely illustrative. The foregoing is intended to illustrate and describe the exemplary embodiments of the present disclosure and the present disclosure can be used in various other combinations, modifications, and environments. That is, the present disclosure can be modified or changed within the scope of the concept of the present disclosure disclosed herein, within the scope equivalent to the foregoing, and / or within the scope of technology or knowledge known in the art. The above-described embodiments are intended to describe the best mode for carrying out the technical idea of the present disclosure, and various modifications required for the specific application and use of the present disclosure can also be made. Therefore, the foregoing detailed description is not intended to limit the present disclosure to the disclosed modes. The appended claims should be interpreted to include other modes as well.

Claims

1. A decorative structure, comprising: Decorative unit, configured to be located on the surface of the lower door and perform shock absorption and load support, wherein the decorative unit includes: Constructed as the first layer region for absorbing energy; and Constructed as a second layer region to withstand collisions. Furthermore, when the lower door is opened, the decorative unit is supported on the external ground; The decorative structure also includes: A driving unit configured to apply a driving force to the decorative unit; Decorative hinges, configured to connect the upper part of the decorative unit to the lower door; and A decorative rod is attached to the lower part of the decorative unit. Specifically, the decorative unit is configured to tilt from the lower door by rotating the lower end of the decorative unit around the decorative hinge.

2. The decorative structure according to claim 1, wherein, The decorative unit further includes: A decorative panel forms the outer surface of the decorative unit; The first impact member is formed on the inner side of the decorative panel; The absorbent member is located in the first layer region; A spring component is located inside the absorbing component; A second impact member is formed inside the first impact member; and A damping spring is located in the second layer region.

3. The decorative structure according to claim 2, wherein, The first impact member includes a first peak and a first valley that are continuously formed, wherein the spring member contacts the first valley.

4. The decorative structure according to claim 3, wherein, The first peak and the first valley have flat portions.

5. The decorative structure according to claim 2, wherein, The second impact member includes a second peak and a second valley that are continuously formed, wherein a first end of the damping spring contacts the first peak, and a second opposite end of the damping spring contacts the second peak.

6. The decorative structure according to claim 5, wherein, The second peak and the second valley have flat portions.

7. The decorative structure according to claim 2, wherein, The spring member and the damping spring are alternately located at positions corresponding to the first peak and the first valley.

8. The decorative structure according to claim 2, wherein, The first impact member and the second impact member are made of high-strength steel or high-grade high-strength steel.

9. The decorative structure according to claim 1, wherein, The driving unit includes: Actuator, configured to apply driving force; and The main shaft is configured to move in the longitudinal direction via the actuator. Wherein, when the main shaft extends in the longitudinal direction, at least a portion of the decorative unit is configured to tilt to a predetermined angle.

10. A vehicle comprising: Body; A door, the door being connected to the vehicle body, the door comprising an upper door and a lower door; as well as A decorative unit is located on the surface of the lower door, wherein the decorative unit includes: First layer area; Second layer area; A decorative panel forms the outer surface of the decorative unit; The first impact member is formed on the inner side of the decorative panel; The absorbent member is located in the first layer region; A spring component is located inside the absorbing component; A second impact member is formed inside the first impact member; and Damping spring, located in the second layer region; A driving unit configured to apply a driving force to the decorative unit; Decorative hinges connect the upper part of the decorative unit to the lower door; and A decorative rod is attached to the lower part of the decorative unit. Specifically, the decorative unit is configured to tilt from the lower door by rotating the lower end of the decorative unit around the decorative hinge.

11. The vehicle according to claim 10, wherein, The first impact member includes a first peak and a first valley that are continuously formed, wherein the spring member contacts the first valley.

12. The vehicle according to claim 11, wherein, The second impact member includes a second peak and a second valley that are continuously formed, wherein a first end of the damping spring contacts the first peak, and a second opposite end of the damping spring contacts the second peak.

13. The vehicle according to claim 12, wherein, The first peak, the first valley, the second peak, and the second valley each have a flat portion.

14. The vehicle according to claim 10, wherein, The spring member and the damping spring are alternately located at positions corresponding to the first peak and the first valley.

15. The vehicle according to claim 10, wherein, The first impact member and the second impact member are made of high-strength steel or high-grade high-strength steel.

16. The vehicle according to claim 10, wherein, The driving unit includes: Actuator, configured to apply driving force; and The main shaft is configured to move in the longitudinal direction via the actuator. Wherein, when the main shaft extends in the longitudinal direction, at least a portion of the decorative unit is configured to tilt to a predetermined angle.

17. A decorative unit configured to be located on the surface of a lower door of a vehicle, the decorative unit comprising: First layer area; Second layer area; A decorative panel forms the outer surface of the decorative unit; A first impact member is formed on the inner side of the decorative panel, the first impact member including a first peak and a first valley that are continuously formed; The absorbent member is located in the first layer region; A spring member is located inside the absorbing member, wherein the spring member is in contact with the first valley portion; A second impact member is formed inside the first impact member, the second impact member including a continuously formed second peak and a second valley; and A damping spring is located in the second layer region, wherein a first end of the damping spring contacts the first peak, and a second opposite end of the damping spring contacts the second peak; A drive unit configured to apply a driving force to the decorative unit, the drive unit including an actuator configured to apply the driving force and a main shaft configured to move in a longitudinal direction via the actuator, wherein, when the main shaft extends in the longitudinal direction, at least a portion of the decorative unit is configured to tilt to a predetermined angle. Decorative hinges, configured to connect the upper part of the decorative unit to the lower door; and A decorative rod is attached to the lower part of the decorative unit.

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