Container door plate opening and closing device and vehicle comprising container door plate opening and closing device

Abstract

The invention relates to the technical field of automobiles, in particular to a container door plate opening and closing device and a vehicle comprising the container door plate opening and closing device, a container comprises a framework and a container body arranged on the framework, and the container body comprises a front plate, a tail door and side plates on the two sides; a side door adjacent to the tail door is formed on at least one side plate; the door plate opening and closing device comprises a first hinge, a second hinge and a third hinge, the second hinge is used for hinging the side door with the side plate; the transmission structure is configured to guide the side door to be turned over to be opened or closed along the axis of the second hinge when the tail door is turned over to be opened or closed around the axis of the first hinge; the driving structure is used for driving the tail door to be turned over to be opened or closed around the axis of the first hinge. Linkage opening and closing of the tail door and the side door are achieved through the transmission structure, an operator only needs to control opening or closing of the tail door to drive the side door to act synchronously, the side door does not need to be operated independently, the operation process is greatly simplified, and the loading and unloading efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and more specifically, to a cargo box door opening and closing device and a vehicle including the same. Background Technology

[0002] Traditional pickup truck tailgate opening and closing mechanisms use locking mechanisms on both sides to control the tailgate's operation. This type of structure is relatively cumbersome, requiring the operator to manually open both locking mechanisms on either side to open the door. Furthermore, once opened, the rear tailgate will eventually fall to the hinge's limit position due to gravity, which can easily damage the hinge over time, affecting its lifespan. Additionally, the tailgate's open position is not fixed and may wobble due to vibrations and swaying of the cargo bed caused by the operator moving goods, inconveniencing the operator and damaging the hinge.

[0003] US Patent No. 11987131B2 discloses an electric pickup truck, describing a tailgate that can be triggered independently via a remote key button. An electronically controlled solenoid valve automatically releases the mechanical locking mechanism, eliminating the need for manual unlocking. The tailgate and foldable side panels use the same electronic control logic, allowing for slow, automatic folding to a horizontal position after unlocking, and also enabling electronic operation for resetting. However, this solution relies on a latch to open and close the tailgate and side doors. This fails to address the issue of the tailgate and side doors remaining in their fixed positions after opening. Furthermore, the tailgate and side doors operate independently without any linkage, resulting in insufficient ease of use. Summary of the Invention

[0004] The main objective of this invention is to provide a cargo box door opening and closing device and a vehicle containing the device, which enables the coordinated opening and closing of the tailgate and side doors, simplifies the operation process, ensures the positional stability of the door after it is opened, and extends the service life of the components.

[0005] To address the aforementioned technical problems, this invention proposes a cargo box door opening and closing device. The cargo box includes a frame and a cargo box body mounted on the frame. The cargo box body includes a front panel, a rear door, and side panels on both sides. At least one side panel has a side door adjacent to the rear door. The door opening and closing device includes: The first hinge connects the tailgate to the frame. The second hinge connects the side door to the side panel; or the side door to the frame. The transmission structure is configured to guide the side door to fold open or close along the axis of the second hinge when the tailgate folds open or closes about the axis of the first hinge. And a drive structure for driving the tailgate to fold open or close around the axis of the first hinge.

[0006] In the above technical solution, the axis of the first hinge is arranged horizontally; the axis of the second hinge is arranged vertically.

[0007] In any of the above technical solutions, the transmission structure further includes: A push-pull rod having a first end and a second end, the first end being rotatably connected to a side door; And the linkage mechanism, which is located on the tailgate; When the tailgate folds, the linkage applies a pushing or pulling force to the push-pull rod to move it, and together they drive the side door to fold.

[0008] In any of the above technical solutions, the transmission structure further includes: Guide rails are installed on the frame and laid out along the length of the cargo box; The second end of the push-pull rod is slidably mounted on the guide rail.

[0009] In any of the above technical solutions, the guide rail further includes: The guide rail base has a groove extending along its length. The guide rod is installed inside the slide groove; The second end of the push-pull rod is slidably mounted on the guide rod.

[0010] In any of the above technical solutions, the transmission structure further includes: The reset element is used to apply an external force to the push-pull rod to close the side door.

[0011] In any of the above technical solutions, the reset component is further defined as a reset spring sleeved on the guide rod.

[0012] In any of the above technical solutions, the linkage further includes: The linkage block is installed on the tailgate; And a push plate, one end of which is pressed against the linkage block, and the other end is rotatably connected to the second end of the push-pull rod; When the tailgate folds open, the linkage block moves the push-pull rod via the push plate.

[0013] In any of the above technical solutions, a guide wheel is further provided on the linkage block, and the linkage block is pressed against the push plate through the guide wheel.

[0014] In any of the above technical solutions, a locking bar is further provided on the side of the side door adjacent to the tail door, and a latch adapted to the locking bar is provided on the tail door; When the tailgate is closed, the locking bar is locked in the latch; when the tailgate is folded open, the latch disengages from the locking bar, and the locking bar is unlocked.

[0015] In any of the above technical solutions, the driving structure is further described as an electric strut, with one end of the electric strut mounted on the frame and the other end mounted on the tailgate.

[0016] On the other hand, a vehicle is also proposed, including a cargo box, wherein the cargo box door opening and closing device of any of the above-mentioned technical solutions is also included.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The tailgate and side doors are opened and closed in conjunction with each other through a transmission structure. Operators only need to control the opening or closing of the tailgate to drive the side doors to move synchronously. There is no need to operate the side doors separately, which greatly simplifies the operation process and improves loading and unloading efficiency.

[0018] 2. The axes of the first hinge and the second hinge are arranged horizontally and vertically respectively to adapt to the installation position and folding requirements of the tailgate and side door, ensuring smooth and stable linkage and avoiding jamming.

[0019] 3. The design of the push-pull rod and guide rail provides precise guidance for the movement of the push-pull rod, ensuring the motion accuracy of the transmission structure, and thus improving the synchronization of the tailgate and side door linkage.

[0020] 4. The reset mechanism allows the side door to automatically reset and close when the tailgate is closed, via a push-pull rod, eliminating the need for manual closing of the side door, further simplifying the operation, while ensuring that the side door is fully closed.

[0021] 5. The design of the guide wheel in the linkage reduces frictional loss between the linkage block and the push plate, improves transmission efficiency, extends the service life of components, and reduces maintenance costs.

[0022] 6. The locking rod and latch mechanism work together to double-fix the side door and tailgate when the tailgate is closed, preventing the side door from loosening or shaking during vehicle operation, thus improving structural stability and safety; the tailgate unlocks automatically when it is opened, without affecting the linkage function.

[0023] 7. The electric strut serves as the drive structure, enabling electric control of the tailgate. This eliminates the need for manual pushing and pulling of the tailgate, reducing the labor intensity of operators. It is especially suitable for scenarios with large cargo boxes or heavy loads, thus improving the user experience. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 is a schematic diagram of the overall structure of the cargo box door opening and closing device of the present invention; Figure 2 is a schematic diagram of the connection relationship between the tailgate, side doors and frame in this invention; Figure 3 is a schematic diagram of the connection relationship between the tailgate, side doors and frame in this invention; Figure 4 is Figure 3 A magnified structural diagram of the structure; Figure 5 is a schematic diagram showing the connection relationship between the transmission structure and the tailgate and side doors in this invention; Figure 6 is a schematic diagram of the enlarged structure in step 5.

[0026] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Cargo box body; 21. Front panel; 22. Tail door; 23. Side panel; 24. Side door; 3. First hinge; 4. Second hinge; 5. Transmission structure; 51. Push-pull rod; 52. Linkage part; 521. Linkage block; 522. Push plate; 523. Guide wheel; 53. Guide rail; 531. Guide rail seat; 532. Slide groove; 533. Guide rod; 534. Reset part; 6. Locking rod; 7. Locking buckle; 8. Drive structure. Detailed Implementation

[0027] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0028] It should be noted that, as shown in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0029] If the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] The following embodiments will be used to describe in detail the cargo box door opening and closing device of this application and the vehicle containing it.

[0033] Example 1: like Figures 1-6 As shown, this embodiment proposes a cargo box door opening and closing device. The cargo box includes a frame 1 and a cargo box body 2 disposed on the frame 1. The cargo box body 2 includes a front panel 21, a tailgate 22, and side panels 23 on both sides. At least one of the side panels 23 has a side door 24 adjacent to the tailgate 22. The door opening and closing device includes a first hinge 3, a second hinge 4, and a transmission structure 5.

[0034] The first hinge 3 hinges the tailgate 22 to the frame 1, and its axis is arranged horizontally, so that the tailgate 22 can be opened or closed horizontally around the first hinge 3; the second hinge 4 hinges the side door 24 to the side panel 23, or the side door 24 to the frame 1; its axis is arranged vertically, so that the side door 24 can be opened or closed vertically around the second hinge 4.

[0035] The transmission structure 5 is configured to realize the linkage between the tailgate 22 and the side door 24. Specifically, when the tailgate 22 is folded open around the first hinge 3, the transmission structure 5 guides the side door 24 to fold open along the second hinge 4; when the tailgate 22 is folded closed around the first hinge 3, the transmission structure 5 guides the side door 24 to fold close along the second hinge 4.

[0036] Specifically, the opening process is as follows: the operator manually or by external force drives the tailgate 22 to fold outward around the horizontal axis of the first hinge 3. During the opening process of the tailgate 22, the power is transmitted to the side door 24 through the transmission structure 5. Under the guidance of the transmission structure 5, the side door 24 folds outward synchronously around the vertical axis of the second hinge 4, realizing the linkage opening of the tailgate 22 and the side door 24 until both the tailgate 22 and the side door 24 reach the preset opening position.

[0037] Closing process: The operator manually or by external force drives the tailgate 22 to fold inward around the horizontal axis of the first hinge 3. During the closing process, the power of the tailgate 22 is transmitted in the reverse direction to the side door 24 through the transmission structure 5. Under the guidance of the transmission structure 5, the side door 24 folds inward synchronously around the vertical axis of the second hinge 4 until both the tailgate 22 and the side door 24 are closed in place.

[0038] It should be noted that the angle between the side door 24 and the side panel 23 and the tailgate 22 is greater than 90°, that is, the length of the tailgate 22 is less than the length of the front panel 21, and the side panel 23, the side door 24 and the tailgate 22 form three surfaces.

[0039] It should be noted that each of the two side plates 23 is provided with a side door 24. The two side plates 23 and the two side doors 24 are symmetrically installed on both sides of the frame 1. The same transmission structure 5 has two sets, which act on the two side doors 24 respectively.

[0040] This embodiment achieves the linkage opening and closing of the tailgate 22 and the side door 24 through the cooperation of a simple hinge and transmission structure 5. Compared with the traditional independent operation structure, it greatly reduces the operation steps and improves the convenience of loading and unloading.

[0041] Example 2: This embodiment is a further improvement based on Embodiment 1.

[0042] like Figure 2 , Figure 5 , Figure 6 As shown, in this embodiment, the transmission structure 5 includes a push-pull rod 51, a linkage part 52, and a guide rail 53. The push-pull rod 51 has a first end and a second end. The first end is rotatably connected to the side door 24 and can be rotated and adjusted as the side door 24 is folded. The linkage part 52 is disposed on the tailgate 22 and is used to transmit the power of the tailgate 22 to the push-pull rod 51.

[0043] The guide rail 53 is mounted on the frame 1 and arranged along the length of the cargo box. The second end of the push-pull rod 51 is slidably mounted on the guide rail 53, providing guidance for the movement of the push-pull rod 51. The guide rail 53 includes a guide rail seat 531 and a guide rod 533. The guide rail seat 531 has a groove 532 extending along its length. The guide rod 533 is disposed in the groove 532. The second end of the push-pull rod 51 is slidably sleeved on the guide rod 533, ensuring that the push-pull rod 51 slides stably along the axial direction of the guide rod 533.

[0044] The cooperation between the push-pull rod 51 and the guide rail 53 provides guidance for the linkage transmission, avoids jamming caused by the offset of the push-pull rod 51, and improves the stability of the linkage process. In this embodiment, the transmission structure 5 also includes a reset element 534, which is a reset spring sleeved on the guide rod 533. One end of the reset spring abuts against the guide rail seat 531, and the other end abuts against the second end of the push-pull rod 51, and is used to apply an external force to the push-pull rod 51 to close the side door 24. The reset spring enables the side door 24 to automatically reset, and no additional operation of the side door 24 is required when the tailgate 22 is closed, further simplifying the operation process.

[0045] Example 3: This embodiment is a further improvement based on any of the above embodiments.

[0046] like Figure 6 As shown, in this embodiment, the linkage part 52 includes a linkage block 521 and a push plate 522. The linkage block 521 is fixedly mounted on the tailgate 22 and folds together with the tailgate 22. One end of the push plate 522 abuts against the linkage block 521, and the other end is rotatably connected to the second end of the push-pull rod 51 to realize flexible power transmission.

[0047] Specifically, when the tailgate 22 is opened horizontally around the first hinge 3, the linkage block 521 on the tailgate 22 moves together with the tailgate 22. The linkage block 521 presses against the push plate 522 and pushes the push plate 522 to move. The push plate 522 drives the second end of the push-pull rod 51 to slide away from the tailgate 22 along the guide rod 533. The first end of the push-pull rod 51 pushes the side door 24 to open vertically around the second hinge 4. At this time, the return spring is compressed by the second end of the push-pull rod 51, storing elastic potential energy. When the tailgate 22 reaches the preset opening position, the push-pull rod 51 stops moving, and the side door 24 simultaneously reaches the opening position, realizing stable linkage opening.

[0048] When the tailgate 22 is closed horizontally around the first hinge 3, the linkage block 521 moves in the opposite direction with the tailgate 22. The return spring releases its elastic potential energy, pushing the second end of the push-pull rod 51 to slide along the guide rod 533 towards the tailgate 22. The first end of the push-pull rod 51 pulls the side door 24 to close vertically around the second hinge 4. Until the tailgate 22 is fully closed, the side door 24 closes synchronously, and the return spring returns to its initial state.

[0049] In this embodiment, to reduce frictional loss, the linkage block 521 is provided with a guide wheel 523. The linkage block 521 abuts against the push plate 522 through the guide wheel 523, so that rolling friction is formed between the guide wheel 523 and the push plate 522 when the tailgate 22 is folded.

[0050] The design of the guide wheel 523 in the linkage 52 transforms sliding friction into rolling friction, reducing component wear, extending service life, and improving transmission efficiency, making the linkage action smoother; the overall transmission structure 5 has a reasonable layout and direct power transmission, ensuring the synchronization of the tailgate 22 and the side door 24.

[0051] Example 4: This embodiment is a further improvement based on any of the above embodiments.

[0052] like Figure 3 and Figure 4 As shown, in this embodiment, a locking rod 6 is provided on the side of the side door 24 adjacent to the tailgate 22, and a latch 7 adapted to the locking rod 6 is provided on the tailgate 22. When the tailgate 22 is closed, the locking rod 6 is locked in the latch 7, realizing the double fixation of the side door 24 and the tailgate 22; when the tailgate 22 is opened, the latch 7 folds away from the locking rod 6 along with the tailgate 22, and the locking rod 6 is automatically unlocked without affecting the linkage opening of the side door 24.

[0053] This embodiment enhances the connection reliability between the tailgate 22 and the side door 24 when they are closed by setting a locking structure, preventing the side door 24 from loosening or shaking due to vibration during vehicle operation, thus improving driving safety.

[0054] Example 5: This embodiment is a further improvement based on any of the above embodiments.

[0055] like Figure 2 , Figure 3 , Figure 5 As shown, in this embodiment, the door opening and closing device further includes a drive structure 8, which is an electric strut. One end of the electric strut is mounted on the frame 1, and the other end is mounted on the tailgate 22. It is used to drive the tailgate 22 to fold open or close around the axis of the first hinge 3. The electric strut can be started and stopped by the vehicle's built-in control system or an independent controller to achieve electric control.

[0056] It should be noted that the electric strut is installed at the bottom of the frame 1, and the telescopic end of the electric strut is located below the first hinge 3, so as to realize the automatic control of the tailgate 22 by the electric strut.

[0057] Specifically, the controller activates the electric strut, which retracts to pull the tailgate 22 outward around the horizontal axis of the first hinge 3. Initially, when the tailgate 22 opens, the latch 7 disengages from the locking rod 6 as the tailgate 22 moves, unlocking the locking rod 6. Subsequently, the linkage block 521 on the tailgate 22 pushes the push plate 522 via the guide wheel 523. The push plate 522 causes the second end of the push-pull rod 51 to slide along the guide rod 533, pushing the side door 24 to vertically fold open around the second hinge 4, compressing the return spring. When the tailgate 22 reaches the preset opening position, the electric strut stops retracting, the push-pull rod 51 stops moving, and the side door 24 opens synchronously, achieving electric linkage opening. Conversely, the controller controls the electric strut to extend, pushing the tailgate 22 inward around the horizontal axis of the first hinge 3. The linkage block 521 moves in the opposite direction with the tailgate 22, the return spring releases its elastic potential energy, pushing the push-pull rod 51 to slide in the opposite direction, and the push-pull rod 51 pulls the side door 24 to fold closed synchronously. As the tailgate 22 is about to close, the locking rod 6 on the side door 24 gradually approaches the latch 7 on the tailgate 22 until the tailgate 22 is completely closed. The locking rod 6 is locked in the latch 7, achieving double fixation. The electric strut stops retracting, completing the linkage closing.

[0058] In this embodiment, the electric strut serves as the drive structure 8, enabling electric control of the tailgate 22 and side doors 24. This eliminates the need for manual pushing and pulling, reducing the labor intensity of operators and making it particularly suitable for scenarios with large cargo boxes or heavy loads.

[0059] Example 6: This embodiment provides a vehicle, including a cargo box and the cargo box door opening and closing device of any of the above embodiments.

[0060] The vehicle's cargo box uses the door opening and closing device described in the above embodiments. Depending on the vehicle's usage scenario and requirements, a basic structure, an optimized transmission structure 5, or a solution with locking and drive structure 8 can be selected.

[0061] By equipping the vehicle with the cargo box door opening and closing device of this invention, the convenience of using the cargo box is significantly improved, and the operational difficulty and labor intensity during loading and unloading are reduced; the linkage structure reduces the number of operation steps and improves loading and unloading efficiency; the stable transmission and locking structure ensures safety during driving and extends the service life of cargo box components; the device is compatible with the installation space of existing vehicle cargo boxes, has low modification and assembly difficulty, is easy to apply in batches, and enhances the market competitiveness of the vehicle.

[0062] It should be noted that the vehicle is a truck, preferably a pickup truck.

[0063] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A cargo box door opening and closing device, the cargo box comprising: A frame (1) and a cargo box body (2) disposed on the frame (1), the cargo box body (2) comprising: a front panel (21), a tailgate (22) and side panels (23) on both sides; characterized in that at least one of the side panels (23) has a side door (24) adjacent to the tailgate (22); the door panel opening and closing device comprises: The first hinge (3) hinges the tailgate (22) to the frame (1); The second hinge (4) hinges the side door (24) to the side plate (23); or the side door (24) hinges the frame (1); The transmission structure (5) is configured to guide the side door (24) to fold open or close along the axis of the second hinge (4) when the tailgate (22) folds open or closes about the axis of the first hinge (3); And a drive structure (8) for driving the tailgate (22) to fold open or close around the axis of the first hinge (3).

2. The cargo box door opening and closing device as described in claim 1, characterized in that, The axis of the first hinge (3) is arranged horizontally; the axis of the second hinge (4) is arranged vertically.

3. The cargo box door opening and closing device as described in claim 1, characterized in that, The angle between the side door (24) and the side panel (23) and the tail door (22) is greater than 90°.

4. The cargo box door opening and closing device as described in claim 1, characterized in that, The transmission structure (5) includes: A push-pull rod (51) has a first end and a second end, the first end being rotatably connected to the side door (24); And a linkage part (52), which is disposed on the tailgate (22); When the tailgate (22) folds, the linkage (52) applies a pushing or pulling force to the push-pull rod (51) to make it move, and together they drive the side door (24) to fold.

5. The cargo box door opening and closing device as described in claim 4, characterized in that, The transmission structure (5) also includes: The guide rail (53) is set on the frame (1) and is arranged along the length of the cargo box; The second end of the push-pull rod (51) is slidably mounted on the guide rail (53).

6. The cargo box door opening and closing device as described in claim 5, characterized in that, The guide rail (53) includes: The guide rail base (531) has a groove (532) extending along its length. The guide rod (533) is disposed within the groove (532); The second end of the push-pull rod (51) is slidably disposed on the guide rod (533).

7. The cargo box door opening and closing device as described in claim 6, characterized in that, The transmission structure (5) also includes: The reset element (534) is used to apply an external force to the push-pull rod (51) to cause the side door (24) to close.

8. The cargo box door opening and closing device as described in claim 7, characterized in that, The reset component (534) is a reset spring sleeved on the guide rod (533).

9. The cargo box door opening and closing device as described in claim 6, characterized in that, The linkage unit (52) includes: Linkage block (521) is provided on the tailgate (22); And a push plate (522), one end of which is pressed against the linkage block (521), and the other end is rotatably connected to the second end of the push-pull rod (51); When the tailgate (22) is folded open, the linkage block (521) drives the push-pull rod (51) to move through the push plate (522).

10. The cargo box door opening and closing device as described in claim 9, characterized in that, The linkage block (521) is provided with a guide wheel (523), and the linkage block (521) abuts against the push plate (522) through the guide wheel (523).

11. The cargo box door opening and closing device as described in claim 1, characterized in that, The drive structure (8) is an electric strut, with one end of the electric strut mounted on the frame (1) and the other end mounted on the tailgate (22).

12. The cargo box door opening and closing device according to any one of claims 1-11, characterized in that, A locking bar (6) is provided on the side of the side door (24) adjacent to the tail door (22), and a latch (7) adapted to the locking bar (6) is provided on the tail door (22). When the tailgate (22) is closed, the locking rod (6) is locked inside the latch (7); when the tailgate (22) is folded open, the latch (7) disengages from the locking rod (6), and the locking rod (6) is unlocked.

13. A vehicle, including a cargo box, characterized in that, It also includes the cargo box door opening and closing device as described in any one of claims 1-12.

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