Tailgate mechanism

Abstract

The present disclosure relates to a tailgate mechanism of a vehicle box, comprising a vehicle box, a tailgate, a driving device and a locking device, the rear end of the vehicle box is provided with an opening, the tailgate is hinged to the top of the rear end of the vehicle box, the hinge shaft is arranged on one of the tailgate or the vehicle box, and the hinge hole is arranged on the other one, the hinge hole has at least an extension component in the vertical direction, the driving device is fixed on the vehicle box and the output end extends upward to be hinged to the tailgate, the locking device comprises a locking piece arranged on one of the vehicle box or the tailgate, and a matching piece arranged on the other one, when the tailgate moves from the closed position to the open position, the output end of the driving device drives the tailgate to move upward to make the locking piece and the matching piece disengage, and then drives the tailgate to rotate relative to the vehicle box. The tailgate mechanism of the vehicle box of the present disclosure, by arranging the hinge hole with the extension component, makes the hinge shaft connecting the tailgate and the vehicle box move in the hinge hole, thereby cooperating with the locking device to open or lock the tailgate.

Description

Technical Field

[0001] This disclosure relates to the field of transport vehicle technology, specifically to a tailgate mechanism for a vehicle body. Background Technology

[0002] In the prior art, the tailgate of the transport vehicle is connected to the hinge hole in the cargo box via a hinge shaft. The hinge shaft passes through the hinge hole to achieve rotational opening and closing. The hinge shaft and the hinge hole usually adopt a transition fit or a small clearance fit to ensure that the tailgate can rotate flexibly and be easy to assemble during opening and closing, and can adapt to the vehicle body deformation and thermal expansion and contraction during vehicle operation.

[0003] However, transitional or small-clearance fits essentially only enable the tailgate to rotate and cannot actively participate in locking and securing it. Furthermore, because the hinge structure itself does not participate in locking, the locking mechanism must bear all the anti-loosening and sealing functions. If the locking mechanism fails, the tailgate can easily open unexpectedly, posing a safety hazard. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this disclosure provides the following technical solution:

[0005] This disclosure provides a tailgate mechanism for a vehicle, including:

[0006] The carriage has an opening at its rear end;

[0007] A tailgate, the tailgate being configured to be hinged to the top of the rear end of the vehicle body; a hinge axis is provided on one of the tailgate or the vehicle body, and a hinge hole is provided on the other; the hinge hole is configured to have at least an extension component in the vertical direction.

[0008] A drive unit, which is fixed to the vehicle body, and the output end of the drive unit is configured to extend upward to hinge with the tailgate;

[0009] A locking device, comprising a locking element disposed on one of the vehicle body or the tailgate, and a mating element disposed on the other;

[0010] When the tailgate moves from the closed position to the open position, the output end of the drive device is configured to drive the tailgate upward until the locking member and the mating member disengage, thereby causing the tailgate to rotate relative to the vehicle body.

[0011] In one embodiment of this disclosure, the hinge hole is configured to extend gradually at an angle toward the rear of the vehicle body from bottom to top.

[0012] In one embodiment of this disclosure, the locking member includes first locking portions disposed on both sides of the tailgate, and the mating member includes first mating portions disposed on both sides of the vehicle body; wherein, the first locking portion is provided with a downwardly extending first engaging flange, and the first mating portion is provided with an upwardly extending mating flange; when in the closed position, the first engaging flange is configured to be located on the front side of the mating flange, and their orthographic projections in the horizontal direction at least partially overlap.

[0013] In one embodiment of this disclosure, the front sidewall of the engaging flange is configured from top to bottom as an inclined surface extending forward toward the vehicle body; and / or, the rear sidewall of the first engaging flange is configured from top to bottom as an inclined surface extending forward toward the vehicle body.

[0014] In one embodiment of this disclosure, at least two first locking portions distributed in the height direction are provided on the same side of the tailgate, and the first mating portion is provided on the vehicle body at a position for mating with the first locking portions.

[0015] In one embodiment of this disclosure, the locking member includes a second locking portion disposed at the bottom of the tailgate, and the mating member includes a second mating portion disposed at the bottom of the vehicle body; wherein, the second locking portion is provided with a downwardly extending second engaging flange, and the second mating portion is provided with a pin; when in the closed position, the second engaging flange is configured to engage with the front side of the pin, and their orthogonal projections in the horizontal direction at least partially overlap.

[0016] In one embodiment of this disclosure, the rear sidewall of the second engaging flange is configured from top to bottom as an inclined surface extending forward toward the vehicle body.

[0017] In one embodiment of this disclosure, a connecting portion is provided at the top of the tailgate, the connecting portion being configured to extend forward from the tailgate to be hinged to the vehicle body; the output end of the drive device is configured to be hinged to the connecting portion.

[0018] In one embodiment of this disclosure, a mounting base is provided at the rear end of the vehicle body, and the connecting portion is configured to be hinged to the mounting base.

[0019] In one embodiment of this disclosure, a buffer portion is provided at the bottom of the inner wall of the tailgate, the buffer portion being configured to extend into the interior of the vehicle compartment and having a guide ramp extending from bottom to top toward the rear of the vehicle compartment.

[0020] The tailgate mechanism disclosed herein, by configuring the hinge hole to have at least a vertically extending component, allows the output end of the drive device to first move the tailgate upward when it moves from the closed position to the open position, thereby disengaging the locking component from the mating component. When the drive device moves further upward, it then rotates the tailgate to gradually open it. This disclosure effectively improves the rigidity, sealing, and safety of the tailgate connection by having the hinged portion participate in the locking process while simultaneously performing the rotational opening and closing function. Furthermore, since part of the locking force is borne by the hinged end, the load on the locking device is reduced, thereby improving the stability of the tailgate mechanism and preventing accidental opening of the tailgate.

[0021] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0023] Figure 1 This is a schematic diagram of the structure of a tailgate mechanism for a vehicle body according to an embodiment of this disclosure;

[0024] Figure 2 This is an embodiment provided by the present disclosure. Figure 1 A magnified view of a portion of point A.

[0025] Figures 1 to 2 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:

[0026] 1. Cargo box; 2. Tailgate; 3. Hinge shaft; 4. Hinge hole; 5. Drive unit; 51. Output end; 6. First locking part; 61. First engaging flange; 7. First mating part; 71. Mating flange; 8. Second locking part; 81. Second engaging flange; 9. Second mating part; 91. Pin; 10. Connecting part; 11. Fixing seat; 12. Buffer part. Detailed Implementation

[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0031] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0032] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0033] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0034] This disclosure relates to a tailgate mechanism for a vehicle, including a vehicle body, a tailgate, a drive unit, and a locking device. The rear end of the vehicle body has an opening, and the tailgate is hinged to the top of the rear end of the vehicle body, allowing the tailgate to rotate around the top of the rear end of the vehicle body to open or close the opening. A hinge shaft is disposed on either the tailgate or the vehicle body, and a hinge hole is disposed on the other. The hinge hole has at least a vertical extension component. The hinge shaft is disposed in the hinge hole and can move up and down within the hinge hole. The drive unit is fixed to the vehicle body, and its output end extends upward to hinge with the tailgate. The locking device includes a locking member disposed on either the vehicle body or the tailgate, and a mating member disposed on the other. When the output end of the drive unit pushes the tailgate upward, the hinge shaft first moves upward to the top of the hinge hole and then begins to rotate around the hinge shaft. During the upward movement of the hinge shaft, the locking member and the mating member gradually disengage, thereby opening the locking device.

[0035] The tailgate mechanism disclosed herein, by configuring the hinge hole to have at least a vertically extending component, allows the output end of the drive device to first move the tailgate upward when it moves from the closed position to the open position, thereby disengaging the locking component from the mating component. When the drive device moves further upward, it then rotates the tailgate to gradually open it. This disclosure effectively improves the rigidity, sealing, and safety of the tailgate connection by having the hinged portion participate in the locking process while simultaneously performing the rotational opening and closing function. Furthermore, since part of the locking force is borne by the hinged end, the load on the locking device is reduced, thereby improving the stability of the tailgate mechanism and preventing accidental opening of the tailgate.

[0036] For ease of understanding, please refer to the following: Figures 1 to 2 The specific structure and working principle of a tailgate mechanism for a vehicle compartment disclosed herein will be described in detail with reference to an embodiment.

[0037] refer to Figure 1 and Figure 2 This disclosure provides a tailgate mechanism for a vehicle, including a vehicle body 1, a tailgate 2, a drive unit 5, and a locking device. The rear end of the vehicle body 1 has an opening, and the tailgate 2 is hinged to the top of the rear end of the vehicle body 1. A hinge shaft 3 is provided on either the tailgate 2 or the vehicle body 1, and a hinge hole 4 is provided on the other. The hinge hole 4 has at least a vertical extension component. The drive unit 5 is fixed to the vehicle body 1, and its output end 51 extends upward to be hinged to the tailgate 2. The locking device includes a locking member provided on either the vehicle body 1 or the tailgate 2, and a mating member provided on the other. When the tailgate 2 moves from the closed position to the open position, the output end 51 of the drive unit 5 drives the tailgate 2 to move upward until the locking member disengages from the mating member, thereby causing the tailgate 2 to rotate relative to the vehicle body 1.

[0038] Specifically, this disclosure provides a tailgate 2 that is hinged to the top of the vehicle body 1 at the opening at the rear end of the vehicle body 1. The tailgate 2 is configured to rotate along the hinge shaft 3 on the top of the vehicle body 1 under the action of the drive device 5. The hinge shaft 3 can be provided on either the tailgate 2 or the vehicle body 1, and the hinge hole 4 corresponding to the hinge shaft 3 is provided on the other. By providing the hinge shaft 3 and the hinge hole 4 on the sides of the tailgate 2 and the vehicle body 1 respectively, a reliable rotational connection is achieved.

[0039] Furthermore, in existing technologies, the hinge shaft 3 and hinge hole 4 of the tailgate 2 of a transport vehicle typically employ a transition fit or a small clearance fit to ensure that the tailgate 2 rotates flexibly during opening and closing, is easy to assemble, and can adapt to the vehicle body deformation and thermal expansion and contraction during vehicle operation. However, conventional designs essentially only realize the rotation function of the tailgate 2; the hinge structure itself does not participate in locking, but only exists as a passive rotation fulcrum, while the sealing and anti-derailment functions of the tailgate 2 rely entirely on the locking device. This means that once the locking device loosens due to impact, wear, or mechanism failure, the tailgate 2 loses its main constraint, making it extremely easy for it to open unexpectedly while the vehicle is in motion, causing material leakage or even safety accidents.

[0040] Therefore, this disclosure sets the hinge hole 4 to have at least an extension component in the vertical direction, so that the hinge shaft 3 can be displaced along the extension direction of the hinge hole 4 under the action of the drive device 5. During the opening process of the tailgate 2, the output end 51 of the drive device 5 pushes the tailgate 2 upward, and the hinge shaft 3 will move upward to the top of the hinge hole 4, so that the locking part on the tailgate 2 gradually disengages from the mating part, and then rotates along the hinge shaft 3 to open the tailgate 2; during the closing process of the tailgate 2, through the action of the drive device 5 and the gravity of the tailgate 2 itself, the tailgate 2 moves downward along the shape of the hinge hole 4, so that the tailgate 2 presses more smoothly against the sealing surface, so that the locking part on the tailgate 2 gradually engages with the mating part, achieving the purpose of gravity-assisted locking.

[0041] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, the hinge hole 4 is configured to extend gradually from bottom to top toward the rear of the carriage 1.

[0042] Specifically, the hinge hole 4 gradually extends from bottom to top towards the rear of the vehicle body 1, which allows the tailgate 2 to naturally form a movement trajectory of first lifting and then flipping outward during the opening process. When the tailgate 2 is opened, the hinge shaft 3 moves upward and backward along the path of the hinge hole 4, thereby causing the locking parts on the tailgate 2 to gradually disengage from the mating parts, thus opening the tailgate 2.

[0043] In addition, during the closing process, when the tailgate 2 moves along the inclined direction of the hinge hole 4 under its own weight, it will generate a backward component force, which will cause the tailgate 2 to press more smoothly against the sealing surface, thus achieving the purpose of gravity-assisted locking.

[0044] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, the locking member includes a first locking portion 6 disposed on both sides of the tailgate 2, and the mating member includes a first mating portion 7 disposed on both sides of the vehicle body 1; wherein, the first locking portion 6 is provided with a downwardly extending first engaging flange 61, and the first mating portion 7 is provided with an upwardly extending mating flange 71; when in the closed position, the first engaging flange 61 is configured to be located on the front side of the mating flange 71, and their orthographic projections in the horizontal direction at least partially overlap.

[0045] Specifically, the first locking part 6 on both sides of the tailgate 2 and the first mating part 7 on both sides of the cargo box 1 are connected to each other to form a locking device. The first engaging flange 61 on the first locking part 6 and the mating flange 71 on the first mating part 7 can at least partially overlap in the horizontal direction when the tailgate 2 is in the closed position. That is to say, the first engaging flange 61 and the mating flange 71 can form an overlapping structure in the horizontal direction when the tailgate 2 is closed. When the vehicle experiences bumps or sudden braking during transportation, the rear side of the first engaging flange 61 will contact the front side of the mating flange 71, thereby further locking the tailgate 2 and improving the impact resistance and overall safety of the tailgate 2.

[0046] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, the front sidewall of the engaging flange 71 is configured from top to bottom as an inclined surface extending forward toward the front of the vehicle body 1; and / or, the rear sidewall of the first engaging flange 61 is configured from top to bottom as an inclined surface extending forward toward the front of the vehicle body 1.

[0047] Specifically, when the tailgate 2 rotates downwards around the hinge axis 3 at the top of the vehicle body 1 via the connecting part 10 at the top, the tailgate 2 moves towards the rear of the vehicle body 1 along an arc trajectory. During this process, the downwardly extending first engaging flange 61, guided by the inclined surface of the front side wall of the mating flange 71, gradually slides towards the front of the vehicle body 1, so that the rear side of the first engaging flange 61 can finally abut against the front side of the mating flange 71, thereby achieving the purpose of automatic locking, making the locking process smoother and less strenuous.

[0048] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, at least two first locking parts 6 distributed in the height direction are provided on the same side of the tailgate 2, and a first mating part 7 is provided on the vehicle body 1 at a position for mating with the first locking parts 6.

[0049] Specifically, by providing multiple first locking parts 6 in the vertical direction, the locking force is evenly distributed along the height direction of the tailgate 2, thereby ensuring that the tailgate 2 is reliably fixed from top to bottom. Furthermore, the multiple first locking parts 6 and the first mating parts 7 are correspondingly arranged in the height direction, ensuring that the multiple engaging flanges and mating flanges 71 can accurately abut against each other, thus forming a stable locking relationship. Even if one locking position loses its locking effect due to accidental impact or wear, the remaining locking positions can still maintain the tailgate 2 in a basically closed state, thereby preventing leakage.

[0050] refer to Figure 1 and Figure 2In one embodiment of this disclosure, the locking member includes a second locking portion 8 disposed at the bottom of the tailgate 2, and the mating member includes a second mating portion 9 disposed at the bottom of the vehicle body 1; wherein, the second locking portion 8 is provided with a downwardly extending second engaging flange 81, and the second mating portion 9 is provided with a pin 91; when in the closed position, the second engaging flange 81 is configured to engage with the front side of the pin 91, and their orthogonal projections in the horizontal direction at least partially overlap.

[0051] Specifically, to further improve the stability of the locking device, this disclosure provides a second locking part 8 at the bottom of the tailgate 2. The second locking part 8 has a downwardly extending second engaging flange 81, and a second mating part 9 corresponding to the second locking part 8 is provided at the bottom of the vehicle body 1. This second mating part 9 is configured to extend outward in the horizontal direction, i.e., away from the vehicle body 1, and has a pin 91 at its distal end. When the tailgate 2 begins to close, the tailgate 2 rotates downward around the top hinge shaft 3, causing the first engaging flange 61 on the tailgate 2 to gradually slide along the inclined guide surface on the first mating part 7, achieving automatic guidance and initial engagement. During this linkage process, the second engaging flange 81 at the bottom of the tailgate 2 also moves downward, thus entering from top to bottom in front of the pin 91 of the second mating part 9, ultimately causing the horizontal projections of the second engaging flange 81 and the pin 91 to at least partially overlap, forming a reliable mechanical locking structure.

[0052] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, the rear sidewall of the second engaging flange 81 is configured from top to bottom as an inclined surface extending forward toward the carriage 1.

[0053] Specifically, when the tailgate 2 is closed and the bottom second engaging flange 81 enters from top to bottom into the front side of the pin 91 of the second mating part 9, the inclined surface on the rear side wall of the second engaging flange 81 plays an active guiding role. During the downward rotation of the tailgate 2 around the top hinge shaft 3, the inclined surface on the rear side of the second engaging flange 81 first contacts the upper edge of the pin 91. As the tailgate 2 continues to move downward, this inclined surface guides the second engaging flange 81 forward, thereby making the tailgate 2 press more tightly against the opening at the rear of the vehicle body 1. This further improves the locking effect of the tailgate 2, ensuring that the tailgate 2 can ultimately completely fit the opening, and enhancing the overall sealing reliability of the vehicle body 1.

[0054] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, a connecting portion 10 is provided at the top of the tailgate 2, and the connecting portion 10 is configured to extend forward from the tailgate 2 to be hinged to the vehicle body 1; the output end 51 of the drive device 5 is configured to be hinged to the connecting portion 10.

[0055] Specifically, the connecting part 10 serves as a transition structure between the tailgate 2 and the cargo box 1, providing a reasonable lever arm and mounting fulcrum for the drive unit 5. Since the hinge shaft 3 is located at the front end of the connecting part 10 and close to the cargo box 1, the tailgate 2 can move in an arc around the hinge shaft 3 when it is opened. Furthermore, since the hinge hole 4 has a vertically upward extension component, when the output end 51 of the drive unit 5 pushes the connecting part 10 upward, the connecting part 10 can be lifted upward first and then rotated outward, thereby gradually disengaging the locking member on the tailgate 2 from the mating member, thus opening the tailgate 2.

[0056] Secondly, the connecting part 10 extends laterally to form a rigid lever structure, which hinges the output end 51 of the drive device 5 to a certain point of the connecting part 10. When the output end 51 of the drive device 5 extends or retracts, the pushing or pulling force applied to the connecting part 10 acts at a position far away from the hinge shaft 3 of the tailgate 2, which can increase the lever arm of the driving force, reduce the load of the drive device 5, and thus extend the service life of the drive device 5.

[0057] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, a fixing seat 11 is provided at the rear end of the carriage 1, and the connecting part 10 is configured to be hinged to the fixing seat 11.

[0058] Specifically, this disclosure provides two fixing seats 11 at the top of the rear end of the carriage 1. The two fixing seats 11 are symmetrically distributed on both sides of the top of the carriage 1, providing double-sided support for the connecting part 10, thereby improving the load-bearing capacity of the hinge.

[0059] refer to Figure 1 and Figure 2 In one embodiment of this disclosure, a buffer portion 12 is provided at the bottom of the inner wall of the tailgate 2. The buffer portion 12 is configured to extend into the interior of the vehicle compartment 1 and has a guide slope extending from bottom to top toward the rear of the vehicle compartment 1.

[0060] Specifically, since the cargo box 1 is often used to carry a large amount of garbage or other bulk materials, during loading, unloading or transportation, the materials are prone to violently impacting the inside of the tailgate 2, especially the bottom area of ​​the tailgate 2. This impact may not only cause structural deformation or local damage to the tailgate 2, but may also cause the locking device to loosen or be damaged, which may lead to the tailgate 2 not sealing properly, causing material leakage or even accidental opening and other safety problems.

[0061] To mitigate such risks, this disclosure includes a buffer section 12 at the bottom of the inner wall of the tailgate 2. This buffer section 12 extends into the cargo box 1 and has a guide slope that slopes upwards towards the rear of the cargo box 1. When material slides or impacts the tailgate 2 within the cargo box 1, it first contacts the slope of the buffer section. The guide effect of the slope directs some of the material upwards, allowing it to flow back into the cargo box 1, preventing direct accumulation or violent impact on the lower part of the tailgate 2. Simultaneously, the buffer section 12 absorbs some of the impact energy, reducing the force acting on the tailgate 2, thereby effectively protecting the tailgate 2 body and locking device, extending the service life of the tailgate 2 and locking device, and reducing leakage problems caused by damage to the tailgate 2.

[0062] The tailgate mechanism disclosed herein, by configuring the hinge hole to have at least a vertically extending component, allows the output end of the drive device to first move the tailgate upward when it moves from the closed position to the open position, thereby disengaging the locking component from the mating component. When the drive device moves further upward, it then rotates the tailgate to gradually open it. This disclosure effectively improves the rigidity, sealing, and safety of the tailgate connection by having the hinged portion participate in the locking process while simultaneously performing the rotational opening and closing function. Furthermore, since part of the locking force is borne by the hinged end, the load on the locking device is reduced, thereby improving the stability of the tailgate mechanism and preventing accidental opening of the tailgate.

[0063] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not 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 technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A tailgate mechanism for a vehicle, characterized in that, include: The carriage (1) has an opening at its rear end; Tailgate (2), the tailgate (2) is configured to be hinged to the top of the rear end of the vehicle body (1); a hinge shaft (3) is provided on one of the tailgate (2) or the vehicle body (1), and a hinge hole (4) is provided on the other; the hinge hole (4) is configured to have at least an extension component in the vertical direction. A drive unit (5) is fixed to the vehicle body (1), and the output end (51) of the drive unit (5) is configured to extend upward to hinge with the tailgate (2). The locking device includes a locking member disposed on one of the vehicle body (1) or the tailgate (2), and a mating member disposed on the other; When the tailgate (2) moves from the closed position to the open position, the output end (51) of the drive device (5) is configured to drive the tailgate (2) to move upward until the locking member and the mating member are disengaged, and then drive the tailgate (2) to rotate relative to the vehicle body (1).

2. The tailgate mechanism of the vehicle body according to claim 1, characterized in that, The hinge hole (4) is configured to extend gradually from bottom to top toward the rear of the carriage (1).

3. The tailgate mechanism of the vehicle body according to claim 1, characterized in that, The locking component includes a first locking portion (6) disposed on both sides of the tailgate (2), and the mating component includes a first mating portion (7) disposed on both sides of the cargo box (1); wherein, the first locking portion (6) is provided with a downwardly extending first engaging flange (61), and the first mating portion (7) is provided with an upwardly extending mating flange (71); when in the closed position, the first engaging flange (61) is configured to be located on the front side of the mating flange (71), and the orthographic projection in the horizontal direction at least partially overlaps.

4. The tailgate mechanism of the vehicle body according to claim 3, characterized in that, The front sidewall of the mating flange (71) is configured from top to bottom as an inclined surface extending forward toward the vehicle body (1); and / or, the rear sidewall of the first engaging flange (61) is configured from top to bottom as an inclined surface extending forward toward the vehicle body (1).

5. The tailgate mechanism of the vehicle body according to claim 3, characterized in that, The tailgate (2) has at least two first locking parts (6) distributed in the height direction on the same side, and the first mating part (7) is provided on the vehicle body (1) at a position for mating with the first locking part (6).

6. The tailgate mechanism of the vehicle body according to claim 2, characterized in that, The locking component includes a second locking part (8) disposed at the bottom of the tailgate (2), and the mating component includes a second mating part (9) disposed at the bottom of the cargo box (1); wherein, the second locking part (8) is provided with a downwardly extending second engaging flange (81), and the second mating part (9) is provided with a pin (91); when in the closed position, the second engaging flange (81) is configured to engage with the front side of the pin (91), and the orthographic projections in the horizontal direction at least partially overlap.

7. The tailgate mechanism of the vehicle body according to claim 6, characterized in that, The rear sidewall of the second engaging flange (81) is constructed from top to bottom as an inclined surface extending forward toward the carriage (1).

8. The tailgate mechanism of the vehicle body according to claim 1, characterized in that, The top of the tailgate (2) is provided with a connecting part (10), which is configured to extend forward from the tailgate (2) to be hinged to the vehicle body (1); the output end (51) of the drive device (5) is configured to be hinged to the connecting part (10).

9. The tailgate mechanism of the vehicle body according to claim 8, characterized in that, A mounting base (11) is provided at the rear end of the carriage (1), and the connecting part (10) is configured to be hinged to the mounting base (11).

10. The tailgate mechanism of the vehicle body according to claim 1, characterized in that, A buffer section (12) is provided at the bottom of the inner wall of the tailgate (2). The buffer section (12) is configured to extend into the interior of the cargo box (1) and has a guide slope extending from bottom to top toward the rear of the cargo box (1).

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