Back door assembly and vehicle

Abstract

This application relates to the field of vehicle technology and aims to solve the problem of reducing backpack vibration by providing a tailgate assembly and a vehicle. The tailgate assembly includes a door body, a mounting bracket, and a backpack. The door body includes an outer tailgate panel and an inner tailgate panel, defining an internal space between them. The mounting bracket is disposed within the internal space and connects the outer and inner tailgate panels. The backpack is located on the side of the outer tailgate panel away from the inner tailgate panel and is connected to both the outer tailgate panel and the mounting bracket. The advantage of this application is that by connecting the backpack, the outer tailgate panel, and the inner tailgate panel into a whole through the mounting bracket, the rigidity and strength of the backpack mounting area are improved, reducing backpack vibration during vehicle operation.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically, to a tailgate assembly and a vehicle. Background Technology

[0002] A rear hatch assembly is provided in the related art, including a rear hatch outer panel and a backpack, the backpack being mounted on the outside of the rear hatch outer panel via a mounting bracket.

[0003] However, backpacks in related technologies are prone to vibration. Utility Model Content

[0004] This application provides a rear door assembly and a vehicle to address the problem of reducing backpack vibration.

[0005] According to one aspect of this application, a tailgate assembly is provided, including a door body, a mounting bracket, and a backpack. The door body includes an outer tailgate panel and an inner tailgate panel, defining an internal space between the outer and inner tailgate panels. The mounting bracket is disposed in the internal space and connected between the outer and inner tailgate panels. The backpack is disposed on the side of the outer tailgate panel away from the inner tailgate panel, and is connected to both the outer tailgate panel and the mounting bracket.

[0006] The aforementioned tailgate assembly is connected between the outer tailgate panel and the inner tailgate panel by setting a mounting bracket, and the backpack is connected to the outer tailgate panel and the mounting bracket, so that the backpack, the outer tailgate panel and the inner tailgate panel are connected into a whole by the mounting bracket, thereby improving the rigidity and strength of the backpack mounting area and reducing the vibration of the backpack during vehicle operation.

[0007] In one embodiment, the mounting bracket includes a box-shaped structure and an edge portion. The box-shaped structure defines a first cavity with an opening along the length of the vehicle near the outer panel of the tailgate. The first cavity has a front wall along its length opposite to the opening, and the front wall is connected to the inner panel of the tailgate. The edge portion is connected to the edge of the opening and is respectively connected to the outer panel of the tailgate and the backpack.

[0008] In one embodiment, the first cavity further has a top wall and a bottom wall; the top wall and the bottom wall are respectively connected to both sides of the front wall along the height direction of the vehicle and are disposed opposite to each other along the height direction; the top wall is spaced apart from the inner panel of the tailgate along the height direction to define a second cavity between the top wall and the inner panel of the tailgate; the bottom wall is spaced apart from the inner panel of the tailgate along the height direction to define a third cavity between the bottom wall and the inner panel of the tailgate; and / or, the first cavity further has two side walls, the two side walls are respectively connected to both sides of the front wall along the width direction of the vehicle and are disposed opposite to each other along the width direction; the two side walls are spaced apart from the inner panel of the tailgate along the width direction to form a fourth cavity between the side walls and the inner panel of the tailgate.

[0009] In one embodiment, the edge extends along the edge of the opening, and the tailgate assembly further includes a plurality of first fasteners spaced apart along the edge of the opening, the first fasteners respectively passing through the edge, the tailgate outer panel and the backpack; and / or, the edge extends along the edge of the opening, and the mounting bracket is provided with a plurality of welding areas spaced apart along the edge of the opening, the welding areas being used for welding to the tailgate outer panel.

[0010] In one embodiment, the tailgate assembly further includes a plurality of second fasteners, which are respectively inserted through the front wall and the inner panel of the tailgate.

[0011] In one embodiment, the mounting bracket is provided with multiple weight-reducing holes and / or multiple reinforcing ribs.

[0012] In one embodiment, the tailgate assembly further includes a door lock mounting plate. The door lock mounting plate is connected to the side of the inner tailgate panel near the outer tailgate panel, and the door lock mounting plate and mounting bracket are spaced apart along the length of the vehicle.

[0013] In one embodiment, the door lock mounting plate has a door lock mounting hole. The mounting bracket has a clearance space that communicates with the door lock mounting hole along its length.

[0014] In one embodiment, the inner panel of the tailgate is provided with a support arm, which is located outside the mounting bracket, passes through the internal space and is connected to the outer panel of the tailgate.

[0015] According to another aspect of this application, a vehicle is provided, including a tailgate assembly as described in any of the above embodiments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a rear view of a vehicle according to one embodiment of this application.

[0018] Figure 2 for Figure 1 A perspective view of the rear door assembly in the illustrated embodiment.

[0019] Figure 3 for Figure 1 An exploded view of the rear door assembly in the illustrated embodiment.

[0020] Figure 4 for Figure 1 A partial cross-sectional view of the rear tailgate assembly in the embodiment shown, perpendicular to the width direction.

[0021] Figure 5 for Figure 1 A schematic diagram of the assembly state of the backpack, the outer panel of the rear door, and the mounting bracket in the illustrated embodiment.

[0022] Figure 6 for Figure 1 A perspective view of the mounting bracket in the illustrated embodiment.

[0023] Figure 7 for Figure 1 Side view of the mounting bracket in the illustrated embodiment.

[0024] Figure 8 for Figure 1 A bottom view of the mounting bracket in the illustrated embodiment.

[0025] Figure 9 for Figure 1 A partial cross-sectional view of the rear tailgate assembly in the illustrated embodiment, perpendicular to the height direction.

[0026] Figure 10 for Figure 1 A perspective view of the backpack in the illustrated embodiment.

[0027] Figure 11 for Figure 1 A perspective view of the rear door outer panel in the illustrated embodiment.

[0028] Figure 12 for Figure 1 A partial structural diagram of the mounting bracket and the inner panel of the rear door in the illustrated embodiment.

[0029] Figure 13 for Figure 1 A schematic diagram of the door lock mounting plate in the illustrated embodiment.

[0030] Figure 14 for Figure 1 A partial structural diagram of the mounting bracket, door lock mounting plate, and rear door inner panel in the illustrated embodiment.

[0031] Explanation of key component symbols:

[0032] Vehicle 1

[0033] Rear tailgate assembly 100

[0034] Second cavity 100a

[0035] Third cavity 100b

[0036] Fourth cavity 100c

[0037] Door 10

[0038] Interior space 10a

[0039] Rear door outer panel 11

[0040] Second mounting hole 11a

[0041] Second positioning hole 11b

[0042] Rear door inner panel 12

[0043] Support arm 121

[0044] Mounting bracket 20

[0045] Clearance space 20a

[0046] Box-shaped structure 21

[0047] First cavity 21a

[0048] Opening 21b

[0049] Front wall 211

[0050] Fourth mounting hole 211a

[0051] First weight reduction hole 211b

[0052] Mounting surface 2111

[0053] Flanged structure 2113

[0054] Top Wall 212

[0055] Bottom wall 213

[0056] Third weight reduction hole 213a

[0057] Side wall 214

[0058] Second weight reduction hole 214a

[0059] Second reinforcing rib 2141

[0060] Edge 22

[0061] First mounting hole 22a

[0062] First positioning hole 22b

[0063] First reinforcing rib 222

[0064] Welding surface 223

[0065] Backpack 30

[0066] Mounting plate 31

[0067] Third mounting hole 31a

[0068] Third positioning hole 31b

[0069] 311 convex surface

[0070] Box 32

[0071] Door lock mounting plate 40

[0072] Door lock mounting hole 41

[0073] Length direction X

[0074] Width direction Y

[0075] Z-axis height

[0076] The following detailed description, in conjunction with the accompanying drawings, further illustrates this application. Detailed Implementation

[0077] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0078] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0080] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0081] Example

[0082] Figure 1 This is a rear view of vehicle 1 in one embodiment of this application; Figure 2 for Figure 1 A perspective view of the rear door assembly 100 in the illustrated embodiment; Figure 3 for Figure 1 An exploded view of the rear door assembly 100 in the illustrated embodiment.

[0083] See Figure 1 This embodiment provides a vehicle 1, which includes a tailgate assembly 100. The tailgate assembly 100 is located at the rear of the vehicle 1 and provides protection and cover for occupants or stored items.

[0084] Figure 4 for Figure 1 A partial structural cross-sectional view of the rear door assembly 100 in the embodiment shown, perpendicular to the width direction Y.

[0085] See Figures 2 to 4 In this embodiment, the tailgate assembly 100 includes a door body 10, a mounting bracket 20, and a backpack 30. The door body 10 includes an outer tailgate panel 11 and an inner tailgate panel 12, which define an internal space 10a. The mounting bracket 20 is disposed in the internal space 10a and connected between the outer tailgate panel 11 and the inner tailgate panel 12. The backpack 30 is disposed on the side of the outer tailgate panel 11 away from the inner tailgate panel 12, and is connected to both the outer tailgate panel 11 and the mounting bracket 20.

[0086] The aforementioned tailgate assembly 100 includes a backpack 30 for storage. It is connected between the outer tailgate panel 11 and the inner tailgate panel 12 via a mounting bracket 20. The backpack 30 is connected to the outer tailgate panel 11 and the mounting bracket 20, so that the backpack 30, the outer tailgate panel 11, and the inner tailgate panel 12 are connected as a whole via the mounting bracket 20. This improves the rigidity and strength of the backpack 30 mounting area, reduces the vibration of the backpack 30 during vehicle 1 operation, and thus extends the service life of the backpack 30.

[0087] Figure 5 for Figure 1 A schematic diagram of the assembly state of the backpack 30, the rear door outer panel 11, and the mounting bracket 20 in the embodiment shown. Figure 6 for Figure 1 A perspective view of the mounting bracket 20 in the illustrated embodiment; Figure 7 for Figure 1 Side view of the mounting bracket 20 in the illustrated embodiment.

[0088] In some embodiments, such as Figures 5 to 7 As shown, the mounting bracket 20 includes a box-shaped structure 21 and an edge portion 22. Combined with... Figure 4As shown, the box-shaped structure 21 defines a first cavity 21a. The first cavity 21a has an opening 21b on the side near the outer panel 11 of the tailgate along the length X of the vehicle 1. The first cavity 21a has a front wall 211 opposite to the opening 21b along the length X, and the front wall 211 is connected to the inner panel 12 of the tailgate. An edge portion 22 is connected to the edge of the opening 21b and is connected to the outer panel 11 of the tailgate and the backpack 30 respectively. In this way, the box-shaped structure 21 is supported between the outer panel 11 of the tailgate and the inner panel 12 of the tailgate. Since each surface of the box-shaped structure 21 connected between the front wall 211 and the edge portion 22 can provide support, and when external force is applied to the mounting bracket 20, it propagates along each surface of the box-shaped structure 21, so that the external force can be distributed more evenly, improving the overall load-bearing capacity and deformation resistance of the mounting bracket 20, thereby improving its stiffness and strength. The box-shaped structure 21 has a large cross-sectional area, which can more effectively resist bending deformation.

[0089] Figure 8 for Figure 1 Bottom view of the mounting bracket 20 in the illustrated embodiment.

[0090] In some embodiments, such as Figure 4 and Figure 8 As shown, the first cavity 21a also has a top wall 212 and a bottom wall 213. The top wall 212 and the bottom wall 213 are respectively connected to both sides of the front wall 211 along the height direction Z of the vehicle 1 and are arranged opposite to each other along the height direction Z. The top wall 212 is spaced apart from the inner panel 12 of the tailgate along the height direction Z to define a second cavity 100a between the top wall 212 and the inner panel 12 of the tailgate, and the bottom wall 213 is spaced apart from the inner panel 12 of the tailgate along the height direction Z to define a third cavity 100b between the bottom wall 213 and the inner panel 12 of the tailgate. In this way, the first cavity 21a, the second cavity 100a and the third cavity 100b are formed in a cross section perpendicular to the width direction Y, making the cross-sectional shape of the tailgate assembly 100 in the width direction Y more complex, thereby making it more resistant to deformation when subjected to bending forces. Furthermore, it enables external forces to be transmitted along the width direction Y through different cavities of the top wall 212 and bottom wall 213, respectively, avoiding force concentration in a local area, thereby improving structural strength and stiffness, and further reducing the swaying of the backpack 30 during travel.

[0091] In some embodiments, such as Figure 4 As shown, the top wall 212 and the bottom wall 213 extend obliquely toward the outside of the first cavity 21a on the side away from the front wall 211, so as to improve the support effect.

[0092] Figure 9 for Figure 1 A partial structural cross-sectional view of the rear door assembly 100 in the embodiment shown, perpendicular to the height direction Z.

[0093] In some embodiments, such as Figure 9 As shown, the first cavity 21a also has two side walls 214, which are respectively connected to the front wall 211 on both sides along the width direction Y of the vehicle 1 and are arranged opposite to each other along the width direction Y. The two side walls 214 are respectively spaced apart from the inner panel 12 of the tailgate along the width direction Y, so as to form a fourth cavity 100c between the side walls 214 and the inner panel 12 of the tailgate. In this way, the first cavity 21a and two fourth cavities 100c are formed on the cross section perpendicular to the height direction Z, making the cross-sectional shape of the tailgate assembly 100 in the height direction Z more complex, thereby making it more resistant to deformation when subjected to bending force. It also allows external force to be transmitted along the height direction Z along the two side walls 214 in different cavities, avoiding the force concentration in a certain local area, thereby improving the structural strength and stiffness, and further reducing the vibration of the backpack 30 during the driving of the vehicle 1.

[0094] In some embodiments, such as Figure 9 As shown, the two sidewalls 214 extend obliquely outward toward the outer side of the first cavity 21a on the side away from the front wall 211.

[0095] In some embodiments, combined with Figure 6 and Figure 7 As shown, the edge portion 22 extends along the edge of the opening 21b. The rear door assembly 100 also includes a plurality of first fasteners (not shown). The plurality of first fasteners are spaced apart along the edge of the opening 21b. The first fasteners are respectively inserted into the edge portion 22, the rear door outer panel 11 and the backpack 30 to improve the installation reliability of the backpack 30, thereby increasing the service life of the backpack 30.

[0096] Figure 10 for Figure 1 A perspective view of the backpack 30 in the illustrated embodiment; Figure 11 for Figure 1 A perspective view of the rear door outer panel 11 in the illustrated embodiment.

[0097] In some embodiments, such as Figure 6 As shown, the edge portion 22 is provided with a plurality of first mounting holes 22a, which are combined with Figure 10 and Figure 11 As shown, the rear door outer panel 11 is provided with multiple second mounting holes 11a, and the backpack 30 is provided with multiple third mounting holes 31a. The first mounting hole 22a, the second mounting hole 11a, and the third mounting hole 31a correspond one-to-one with the first fasteners, which are respectively inserted through the first mounting hole 22a, the second mounting hole 11a, and the third mounting hole 31a. In this embodiment, there are 8 first fasteners.

[0098] In some embodiments, such as Figure 10As shown, the backpack 30 has multiple protrusions 311, and the third mounting holes 31a are correspondingly provided on the protrusions 311. Optionally, in conjunction with Figure 9 As shown, the backpack 30 includes a mounting plate 31 and a case 32. The mounting plate 31 is connected to the side of the case 32 along the height direction Z near the outer panel 11 of the rear door. A boss 311 protrudes from the mounting plate 31 along the length direction X near the outer panel 11 of the rear door. The shape of the portion of the outer panel 11 of the rear door opposite to the mounting plate 31 matches the shape of the mounting plate 31.

[0099] In some embodiments, such as Figure 6 , Figure 10 and Figure 11 As shown, the mounting bracket 20 is also provided with two first positioning holes 22b, the outer panel 11 of the rear door is provided with two second positioning holes 11b, and the backpack 30 is provided with two third positioning holes 31b. The two second positioning holes 11b and the two third positioning holes 31b correspond to the two first positioning holes 22b respectively, and are used for positioning components (not shown) to pass through, so as to improve the positioning accuracy of the backpack 30. Optionally, the two third positioning holes 31b are respectively provided on two of the bosses 311.

[0100] In some embodiments, such as Figure 5 As shown, the edge portion 22 is along the opening 21b (see...) Figure 7 Extending along the edge of the opening 21b, the mounting bracket 20 is provided with multiple welding areas (not shown in the figure). The multiple welding areas are spaced apart along the edge of the opening 21b. The welding areas are used to weld to the outer panel 11 of the rear door to improve the connection reliability between the mounting bracket 20 and the outer panel 11 of the rear door.

[0101] Optionally, multiple welding areas and multiple first mounting holes 22a are staggered along the edge of the opening 21b.

[0102] Figure 12 for Figure 1 A partial structural schematic diagram of the mounting bracket 20 and the rear door inner panel 12 in the illustrated embodiment.

[0103] In some embodiments, the tailgate assembly 100 further includes a plurality of second fasteners (not shown), which pass through the front wall 211 and the inner tailgate panel 12 respectively, to improve the connection reliability between the mounting bracket 20 and the inner tailgate panel 12. Optionally, the front wall 211 is provided with a plurality of fourth mounting holes 211a, and the inner tailgate panel 12 is provided with a plurality of fifth mounting holes, the fourth mounting holes 211a and the fifth mounting holes corresponding one-to-one with the second fasteners, and the second fasteners passing through the corresponding fourth mounting holes 211a and fifth mounting holes respectively.

[0104] In some embodiments, such as Figure 12As shown, the front wall 211 has multiple mounting surfaces 2111, which are in contact with the inner panel 12 of the rear door. A fourth mounting hole 211a is correspondingly provided on each mounting surface 2111. The portion of the front wall 211 along the height direction Z near the top wall 212 has at least two mounting surfaces 2111, and the portion of the front wall 211 along the width direction Y near any side wall 214 has at least two mounting surfaces 2111. In this embodiment, there are six mounting surfaces 2111.

[0105] In some embodiments, the mounting bracket 20 is provided with a plurality of weight-reducing holes to reduce the weight of the mounting bracket 20.

[0106] In some embodiments, such as Figure 6 As shown, the weight-reducing hole includes a first weight-reducing hole 211b, which is disposed on the front wall 211. Optionally, a flange structure 2113 is provided on the outer edge of the first weight-reducing hole 211b to improve the local stiffness at the location of the first weight-reducing hole 211b.

[0107] In some embodiments, such as Figure 6 As shown, the weight-reducing hole also includes a second weight-reducing hole 214a, which is disposed on the side wall 214. Optionally, there are two sets of second weight-reducing holes 214a, each set including multiple second weight-reducing holes 214a, with the two sets of second weight-reducing holes 214a respectively disposed on the side wall 214, and the second weight-reducing holes 214a in the same set being distributed at intervals along the height direction Z. In this embodiment, there are 3 second weight-reducing holes 214a in each set.

[0108] In some embodiments, such as Figure 6 As shown, the weight-reducing hole also includes a third weight-reducing hole 213a, which is disposed on the bottom wall 213. Optionally, a plurality of third weight-reducing holes 213a are distributed at intervals along the width direction Y. In this embodiment, there are 3 third weight-reducing holes 213a.

[0109] In some embodiments, the mounting bracket 20 is provided with a plurality of reinforcing ribs to improve the rigidity of the mounting bracket 20.

[0110] In some embodiments, such as Figure 6 As shown, the reinforcing rib includes a first reinforcing rib 222, with its edge portion 22 extending away from the outer panel 11 of the rear door along its thickness direction (see...). Figure 5 A first reinforcing rib 222 protrudes from one side to improve the rigidity of the edge portion 22. Optionally, the edge portion 22 is provided with multiple welding surfaces 223, which are in contact with the outer panel 11 of the rear door. The welding surfaces 223 are respectively provided with a first mounting hole 22a, a first positioning hole 22b, and a welding area. The welding surfaces 223 and the first reinforcing rib 222 are connected along the opening 21b (see...). Figure 7 The edges are staggered.

[0111] In some embodiments, such as Figure 5 As shown, the reinforcing rib also includes a second reinforcing rib 2141, which is formed by recessing the sidewall 214 along its thickness direction towards the side closer to the outer panel 11 of the rear door, in order to improve the rigidity of the sidewall 214. Optionally, the second reinforcing rib 2141 is disposed between two adjacent second weight-reducing holes 214a.

[0112] Figure 13 for Figure 1 A schematic diagram of the structure of the door lock mounting plate 40 in the embodiment shown; Figure 14 for Figure 1 A partial structural diagram of the mounting bracket 20, the door lock mounting plate 40, and the rear door inner panel 12 in the embodiment shown.

[0113] In some embodiments, such as Figure 13 and Figure 14 As shown, the tailgate assembly 100 also includes a door lock mounting plate 40. Combined with... Figure 4 As shown, the door lock mounting plate 40 is connected to the side of the inner panel 12 of the rear door near the outer panel 11 of the rear door, and the door lock mounting plate 40 and the mounting bracket 20 are spaced apart along the length direction X of the vehicle 1 to avoid scratching between the door lock mounting plate 40 and the mounting bracket 20 and causing abnormal noise.

[0114] In some embodiments, such as Figure 13 As shown, the door lock mounting plate 40 is provided with door lock mounting holes 41, combined with Figure 14 As shown, the mounting bracket 20 has a clearance space 20a, which communicates with the door lock mounting hole 41 along the length direction X to facilitate the installation of the door lock. Optionally, as... Figure 12 As shown, the bottom wall 213 and the lower parts of the two side walls 214 together define the clearance space 20a. It should be noted that the lower part of the side wall 214 refers to the portion of the side wall 214 that is farther away from the top wall 212 along the height direction Z.

[0115] In some embodiments, such as Figure 12 As shown, the inner panel 12 of the rear door is provided with a support arm 121, which is located outside the mounting bracket 20 and passes through the internal space 10a (see...). Figure 9 It is connected to the outer panel 11 of the rear tailgate to improve the local rigidity of the outer panel 11. Optionally, there are two support arms 121, which are located on both sides of the mounting bracket 20 along the width direction Y. The end of the support arm 121 away from the inner panel 12 of the rear tailgate is welded to the outer panel 11 of the rear tailgate.

[0116] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A tailgate assembly, characterized in that, include: The door body includes an outer rear door panel and an inner rear door panel, with an internal space defined between the outer rear door panel and the inner rear door panel; A mounting bracket is disposed within the internal space and connects between the outer rear door panel and the inner rear door panel; and, The backpack is located on the side of the outer panel of the rear door away from the inner panel of the rear door, and the backpack is connected to the outer panel of the rear door and the mounting bracket.

2. The tailgate assembly of claim 1, wherein: The mounting bracket includes a box-shaped structure and an edge portion; The box-shaped structure defines a first cavity, the first cavity having an opening on the side of the rear tailgate outer panel along the length direction of the vehicle, the first cavity having a front wall opposite the opening along the length direction, the front wall being connected to the rear tailgate inner panel; The edge portion is connected to the edge of the opening, and the edge portion is respectively connected to the outer panel of the rear door and the backpack.

3. The tailgate assembly according to claim 2, characterized in that: The first cavity further comprises a top wall and a bottom wall; the top wall and the bottom wall are respectively connected to both sides of the front wall along the height direction of the vehicle and are disposed opposite to each other along the height direction; the top wall is spaced apart from the inner panel of the tailgate along the height direction to define a second cavity between the top wall and the inner panel of the tailgate; the bottom wall is spaced apart from the inner panel of the tailgate along the height direction to define a third cavity between the bottom wall and the inner panel of the tailgate. And / or, The first cavity also has two side walls, which are respectively connected to the front wall on both sides along the width direction of the vehicle and are arranged opposite to each other along the width direction; the two side walls are respectively spaced apart from the inner panel of the tailgate along the width direction to form a fourth cavity between the side walls and the inner panel of the tailgate.

4. The tailgate assembly according to claim 2, characterized in that: The edge portion extends along the edge of the opening, and the tailgate assembly further includes a plurality of first fasteners, which are spaced apart along the edge of the opening, and the first fasteners are respectively inserted into the edge portion, the tailgate outer panel and the backpack; And / or, The edge portion extends along the edge of the opening, and the mounting bracket is provided with multiple welding areas. The multiple welding areas are spaced apart along the edge of the opening, and the welding areas are used for welding to the outer panel of the rear door.

5. The back door assembly of claim 2, wherein: The tailgate assembly also includes a plurality of second fasteners, which are respectively inserted into the front wall and the inner panel of the tailgate.

6. The tailgate assembly of claim 1, wherein: The mounting bracket is provided with multiple weight-reducing holes and / or multiple reinforcing ribs.

7. The tailgate assembly of claim 1, wherein: The rear door assembly also includes a door lock mounting plate; The door lock mounting plate is connected to the inner panel of the rear door on the side near the outer panel of the rear door, and the door lock mounting plate and the mounting bracket are spaced apart along the length of the vehicle.

8. The tailgate assembly of claim 7, wherein: The door lock mounting plate is provided with door lock mounting holes; The mounting bracket is provided with clearance space, which is connected to the door lock mounting hole along the length direction.

9. The back door assembly of claim 1, wherein: The inner panel of the rear door is provided with a support arm, which is located on the outside of the mounting bracket. The support arm passes through the internal space and is connected to the outer panel of the rear door.

10. A vehicle characterized by comprising: A back door assembly comprising the back door assembly according to any one of claims 1 to 9.

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