Vehicle and carriage and rear door thereof

Abstract

The rear door is installed at the rear end of the carriage and comprises an upturning door assembly and two telescopic rods, the upturning door assembly comprises a second hinge and an upturning door assembly, the second hinge is fixedly connected with the rear end of the top of the carriage, the second hinge is provided with a sixth inserting opening with an opening inclining towards the lower rear portion, and the second hinge is fixedly connected with the rear end of the top of the carriage. The upper end part of the upturning door assembly is inserted into a sixth inserting opening of the second hinge and can rotate in the sixth inserting opening, and the two ends of each telescopic rod are hinged to the upturning door assembly and the compartment respectively. According to the scheme, the upper end of the third hinge is rotationally arranged in the sixth inserting opening of the second hinge, and the opening of the sixth inserting opening is obliquely formed towards the lower rear portion, so that the sixth inserting opening of the second hinge can shield the upper end of the third hinge, it is guaranteed that the hinged structure between the third hinge and the sixth inserting opening is not exposed, and the overall structure is attractive; rainwater and the like can be prevented from entering the space between the second hinge and the third hinge from the upper portion, and the sealing performance and the waterproof performance are good.

Description

Technical Field

[0001] This utility model relates to the field of logistics technology, and in particular to a vehicle and its cargo compartment and rear door. Background Technology

[0002] The cargo compartment is an indispensable part of modern logistics. Its large capacity allows for the loading of a wide variety of items at once, improving the efficiency of each transport trip. The cargo compartment typically consists of a roof, side panels, front panel, and rear door, and is mounted entirely on the vehicle's chassis.

[0003] Generally, the rear door of a vehicle compartment typically includes opening mechanisms, roller shutter mechanisms, upward-opening mechanisms, and downward-opening mechanisms. For example, patent application CN109515520A discloses a logistics vehicle and its compartment. The rear door panel assembly of the compartment includes a rear door frame assembly and a rear door assembly. The rear door frame assembly is used to simultaneously cooperate with the compartment panel assembly, the underframe assembly, and the skirt assembly. The rear door assembly is located at the rear door frame assembly. However, in this solution, a separate rear door frame assembly needs to be set in the rear door panel assembly, making assembly relatively cumbersome. Patent application CN207106305U discloses a catering truck. The top and bottom of the catering truck body are respectively hinged with upward-opening and downward-opening panels. However, the overall waterproof performance of the compartment is poor. In rainy weather, after the upward-opening panel is flipped up, rainwater can easily enter the compartment from the hinge between the upward-opening panel and the compartment body. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a vehicle and its carriage and rear door, wherein the rear door can be directly installed on the rear side of the carriage, and the connection between the rear door and the carriage has a good sealing effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A rear door, installed at the rear end of a vehicle body, includes an upward-opening door assembly and two telescopic rods. The upward-opening door assembly includes a second hinge and an upward-opening door component. The second hinge is fixedly connected to the rear end of the vehicle body roof. The second hinge has a sixth socket with an opening that slopes downwards and backwards. The upper part of the upward-opening door component is inserted into the sixth socket of the second hinge and can rotate within the sixth socket. The two ends of each telescopic rod are respectively hinged to the upward-opening door component and the vehicle body.

[0007] Preferably, the upward-opening door assembly includes a third hinge, a twelfth connector, a thirteenth connector, a fourteenth connector, and an upward-opening door. The twelfth and thirteenth connectors are vertically arranged, each having a U-shaped groove that engages and is fixed to the left and right sides of the upward-opening door. The third hinge and the fourteenth connector are horizontally arranged. One end of the third hinge has a downward-opening U-shaped groove that engages and is fixed to the upper side of the upward-opening door, while the other end of the third hinge is hinged to the second hinge. The fourteenth connector has an upward-opening U-shaped groove that engages and is fixed to the lower side of the upward-opening door.

[0008] Preferably, the fourteenth connector has a first rain awning protruding rearward on its rear side, a fourth sealing strip on the fourteenth connector, a fifth sealing strip on the twelfth connector, and a sixth sealing strip on the thirteenth connector.

[0009] Preferably, the second hinge includes a third connecting part, a fourth connecting part, and a fifth connecting part. The third connecting part and the fifth connecting part are horizontally arranged, and the upper end of the fourth connecting part is vertically connected to the third connecting part. The lower end of the fourth connecting part is vertically connected to the rear side of the fifth connecting part, thereby forming a U-shaped groove between the third connecting part, the fourth connecting part, and the fifth connecting part and being able to be fixedly clipped to the rear end of the top of the carriage. The rear side of the fourth connecting part is provided with a first protrusion and a second protrusion, and a sixth insertion port with a rearward opening is formed between the first protrusion and the second protrusion. The sixth insertion port is provided with a first arc surface, a stop surface, and a second arc surface from top to bottom. The extended surface of the stop surface can pass through the center of the first arc surface.

[0010] The third hinge includes a sixth connecting part, a seventh connecting part, an eighth connecting part, and a ninth connecting part. The sixth and eighth connecting parts are vertically arranged, and their upper ends are connected to the front and rear sides of the seventh connecting part, respectively, thereby forming a U-shaped groove between the sixth, seventh, and eighth connecting parts and fixing them to the upward-opening door. The lower end of the ninth connecting part is connected to the seventh connecting part, and its upper end is provided with a first arc-shaped part and a second arc-shaped part. One end of the first arc-shaped part is connected to the upper end of the ninth connecting part, and the other end of the first arc-shaped part is a free end. The center of the first arc-shaped part coincides with the center of the first arc surface, and the outer diameter of the first arc-shaped part matches the diameter of the first arc surface. The second arc-shaped part is located on the front side of the first arc surface, and its center coincides with the center of the second arc surface, and its outer diameter matches the diameter of the second arc surface. The side of the second arc-shaped part near the ninth connecting part and the side of the first arc-shaped part near the ninth connecting part are provided with stop grooves.

[0011] The first arc-shaped portion of the third hinge is disposed within the sixth socket of the second hinge. The first protrusion of the second hinge is located within the stop groove of the third hinge. The second arc-shaped portion is located at the second arc surface of the sixth socket of the second hinge and can rotate within the second arc surface.

[0012] Preferably, when the lift-up door is opened, the free end of the first arc-shaped part abuts against the stop surface in the sixth socket, and at this time the first protrusion of the second hinge is still located in the stop groove of the third hinge; when the lift-up door is closed, the end of the first protrusion on the second hinge away from the fourth connecting part abuts against the bottom of the stop groove of the third hinge, and at this time the free end of the first arc-shaped part is still located in the sixth socket.

[0013] Preferably, the front side of the fourth connecting part is provided with a recess.

[0014] Preferably, the rear end of the third connector extends rearward to form a second rain eave.

[0015] Preferably, the system also includes a tilting door assembly, the lower end of which is hinged to the rear end of the underframe, and a telescopic rod is hinged between the left and right sides of the tilting door assembly and the left and right sides of the carriage.

[0016] A carriage, including a rear door as described above.

[0017] A vehicle comprising a carriage as described above.

[0018] The present invention has the following beneficial effects due to the adoption of the above technical solution: In the present invention, by rotating the upper end of the third hinge into the sixth socket of the second hinge and tilting the opening of the sixth socket downwards and backwards, the sixth socket of the second hinge can cover the upper end of the third hinge, ensuring that the hinge structure between the two is not exposed, the overall structure is beautiful, and it can also prevent rainwater from entering between the second and third hinges from above, with good sealing and waterproof performance. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the carriage;

[0020] Figure 2 yes Figure 1 Partial exploded view;

[0021] Figure 3 This is an exploded view of the upward-opening door assembly;

[0022] Figure 4 This is a schematic diagram of the connection structure between the second and third hinges;

[0023] Figure 5 This is a schematic diagram of the second hinge.

[0024] Figure 6 This is a schematic diagram of the third hinge.

[0025] Figure label:

[0026] 1. Base frame; 2. Base plate; 3. Top plate assembly; 314. Seventh connector; 4. First side plate assembly; 5. Second side plate assembly; 6. Front plate assembly; 71. Upward-opening door assembly; 711. Second hinge; 7111. Third connecting part; 71111. Second rain cover; 7112. Fourth connecting part; 71121. Recessed part; 71122. First protruding part; 71123. Second protruding part; 71124. Sixth socket; 711241. First arc surface; 711242. Stop. Surface; 711243, Second arc surface; 7113, Fifth connecting part; 712, Third hinge; 7121, Sixth connecting part; 7122, Seventh connecting part; 7123, Eighth connecting part; 7124, Ninth connecting part; 71241, First arc-shaped part; 71242, Second arc-shaped part; 71243, Stop groove; 713, Twelfth connecting piece; 714, Thirteenth connecting piece; 715, Fourteenth connecting piece; 7151, First rain eaves; 716, Upward-opening door; 72, Telescopic rod. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] For clarity, in this invention, when the carriage is installed on a vehicle, the end where the front of the vehicle is located is called the front, and vice versa; the space closest to the carriage encloses is called the inner, and vice versa is called the outer.

[0033] like Figures 1 to 6 As shown, this utility model discloses a rear door installed at the rear end of a vehicle compartment, including an upward-opening door assembly 71 and two telescopic rods 72. The upward-opening door assembly 71 includes a second hinge 711 and an upward-opening door component. The second hinge 711 is fixedly connected to the rear end of the top of the vehicle compartment. The second hinge 711 is provided with a sixth insertion port 71124 with an opening that slopes downwards and backwards. The upper part of the upward-opening door component is inserted into the sixth insertion port 71124 of the second hinge 711 and can rotate within the sixth insertion port 71124. The two ends of each telescopic rod 72 are respectively hinged to the upward-opening door component and the vehicle compartment.

[0034] In this way, the sixth socket 71124 of the second hinge 711 can cover the upper end of the third hinge 712, ensuring that the hinge structure between the second hinge 711 and the third hinge 712 is not exposed, the overall structure is aesthetically pleasing, and it can also prevent rainwater from entering between the second hinge 711 and the third hinge 712 from above, with good sealing and waterproof performance.

[0035] The lift-up door assembly includes a third hinge 712, a twelfth connector 713, a thirteenth connector 714, a fourteenth connector 715, and a lift-up door 716, as follows: Figure 3As shown, the twelfth connector 713 and the thirteenth connector 714 are vertically arranged. Each of the twelfth connector 713 and the thirteenth connector 714 is provided with a U-shaped groove and is engaged and fixed to the left and right sides of the lift-up door 716 through its own U-shaped groove. The third hinge 712 and the fourteenth connector 715 are horizontally arranged. One end of the third hinge 712 is provided with a U-shaped groove with an opening facing downward and is engaged and fixed to the upper side of the lift-up door 716 through its own U-shaped groove. The other end of the third hinge 712 is hinged to the second hinge 711. The fourteenth connector 715 is provided with a U-shaped groove with an opening facing upward and is engaged and fixed to the lower side of the lift-up door 716 through its own U-shaped groove.

[0036] The third hinge 712, the twelfth connector 713, the thirteenth connector 714, and the fourteenth connector 715 protect the four sides of the upward-opening door 716. The upward-opening door 716 is made of thermoplastic composite board. The use of thermoplastic composite board can significantly reduce the weight of the carriage while being able to withstand large loads and impacts. It has good corrosion resistance and water resistance. Furthermore, since the upward-opening door 716 is relatively light in this solution, although the lower end of the third hinge 712 is fixedly connected to the upward-opening door 716, the hinge connection between the third hinge 712 and the second hinge 711 is still stable and reliable.

[0037] The fourteenth connector 715 is equipped with a fourth sealing strip, the twelfth connector 713 is equipped with a fifth sealing strip, and the thirteenth connector 714 is equipped with a sixth sealing strip. In this way, when the upward-opening door assembly is closed, it can ensure that the left, right, and lower sides of the upward-opening door assembly are sealed and connected to the carriage respectively.

[0038] In this invention, the first hinge 711 and the second hinge 712 are made of rubber material.

[0039] like Figure 5 As shown, the second hinge 711 includes a third connecting portion 7111, a fourth connecting portion 7112, and a fifth connecting portion 7113. The third connecting portion 7111 and the fifth connecting portion 7113 are horizontally arranged. The upper end of the fourth connecting portion 7112 is vertically connected to the third connecting portion 7111. The lower end of the fourth connecting portion 7112 is vertically connected to the rear side of the fifth connecting portion 7113, thereby forming a U-shaped groove between the third connecting portion 7111, the fourth connecting portion 7112, and the fifth connecting portion 7113, which can fix the latch. At the rear end of the top of the carriage, the rear side of the fourth connecting part 7112 is provided with a first protrusion 71122 and a second protrusion 71123. A sixth insertion port 71124 with an opening facing rearward is formed between the first protrusion 71122 and the second protrusion 71123. The sixth insertion port 71124 is provided with a first arc surface 711241, a stop surface 711242 and a second arc surface 711243 in sequence from top to bottom. The extended surface of the stop surface 711242 can pass through the center of the first arc surface 711241.

[0040] like Figure 6 As shown, the third hinge 712 includes a sixth connecting part 7121, a seventh connecting part 7122, an eighth connecting part 7123, and a ninth connecting part 7124. The sixth connecting part 7121 and the eighth connecting part 7123 are vertically arranged. The upper ends of the sixth connecting part 7121 and the eighth connecting part 7123 are respectively connected to the front and rear sides of the seventh connecting part 7122, thereby forming a U-shaped groove between the sixth connecting part 7121, the seventh connecting part 7122, and the eighth connecting part 7123, which can be fixedly locked onto the upward-opening door 716. The lower end of the ninth connecting part 7124 is connected to the seventh connecting part 7122. The upper end of the ninth connecting part 7124 is provided with a first arc-shaped part 71241 and a second arc-shaped part 71242. One side of the first arc-shaped part 71241... The first arc-shaped portion 71241 is connected to the upper end of the ninth connecting portion 7124. The other end of the first arc-shaped portion 71241 is a free end. The center of the first arc-shaped portion 71241 coincides with the center of the first arc surface 711241, and the outer diameter of the first arc-shaped portion 71241 is adapted to the diameter of the first arc surface 711241. The second arc-shaped portion 71242 is disposed on the front side of the first arc surface 711241. The center of the second arc-shaped portion 71242 coincides with the center of the second arc surface 711243, and the outer diameter of the second arc-shaped portion 71242 is adapted to the diameter of the second arc surface 711243. A stop groove 71243 is provided on the side of the second arc-shaped portion 71242 near the ninth connecting portion 7124 and on the side of the first arc-shaped portion 71241 near the ninth connecting portion 7124.

[0041] The first arcuate portion 71241 of the third hinge 712 is disposed within the sixth insertion port 71124 of the second hinge 711. The first protrusion 71122 of the second hinge 711 is located within the stop groove 71243 of the third hinge 712. The second arcuate portion 71242 is located at the second arcuate surface 711243 of the sixth insertion port 71124 of the second hinge 711 and can rotate within the second arcuate surface 711243.

[0042] In this design, the second protrusion 71123 of the second hinge 711 can shield the third hinge 712, thus concealing the hinge structure between the second hinge 711 and the third hinge 712, resulting in an aesthetically pleasing overall structure. Furthermore, the second protrusion 71123 of the second hinge 711 prevents rainwater from entering between the second hinge 711 and the third hinge 712. Additionally, on the third hinge 712, a water channel is formed between the ninth connecting portion 7124 and the seventh connecting portion 7122. The seventh connecting portion 7122 is arranged with a downward slope from front to back, facilitating the drainage of water from the water channel.

[0043] When the lift-up door 716 is opened, the free end of the first arc-shaped portion 71241 abuts against the stop surface 711242 in the sixth socket 71124. At this time, the first protrusion 71122 of the second hinge 711 is still located in the stop groove 71243 of the third hinge 712. When the lift-up door 716 is closed, the end of the first protrusion 71122 on the second hinge 711 away from the fourth connecting portion 7112 abuts against the bottom of the stop groove 71243 of the third hinge 712. At this time, the free end of the first arc-shaped portion 71241 is still located in the sixth socket 71124. This can prevent the hinge connection between the third hinge 712 and the second hinge 711 from failing during rotation.

[0044] When the third hinge 712 rotates relative to the second hinge 711, the second hinge 711 may undergo a certain deformation. Therefore, the front side of the fourth connecting part 7112 is provided with a recessed part 71121, so that there is an appropriate gap between the fourth connecting part 7112 and the rear side of the seventh connecting member 314 of the top plate assembly 3.

[0045] The rotation angle between the second hinge 711 and the third hinge 712 can be set to 90° or more, so that when the flip-up door 716 is opened, there will be no restriction on the height of the object to be loaded, and the third hinge 712 will not fall out of the sixth socket 71124 of the second hinge 711.

[0046] In this invention, the rear end of the third connecting part 7111 extends rearward to form a second rain eave 71111, thereby further blocking rainwater.

[0047] The rear door also includes a downward-opening door assembly. The lower end of the downward-opening door assembly is hinged to the rear end of the base frame 1. A telescopic rod is hinged between each of the left and right sides of the downward-opening door assembly and the left and right sides of the truck bed. This allows the downward-opening door assembly to be opened downwards during loading and unloading, serving as a temporary platform for personnel operation and cargo placement. It also allows for loading and unloading by forklifts and other equipment, resulting in high efficiency. Figure 4 As shown, the rear side of the fourteenth connector 715 is provided with a first rain eave 7151, which minimizes the possibility of rainwater entering the carriage from the upper side of the flip-down door assembly.

[0048] This utility model also discloses a method such as Figure 1 The carriage shown includes a rear door as described above. The frame structure of the carriage is mostly made of aluminum, making it lightweight and aesthetically pleasing.

[0049] This utility model also discloses a vehicle, including a carriage as described above.

[0050] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this utility model.

[0051] In the description of this specification, the terms "one embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment, implementation, or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above can also be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this utility model also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A back door, characterized in that The installation is in the rear end of the carriage, comprising a turnover door assembly (71) and two telescopic rods (72), the turnover door assembly (71) comprises a second hinge (711) and a turnover door assembly, wherein the second hinge (711) is fixedly connected with the rear end of the top of the carriage, and a sixth socket (71124) inclined downward is arranged on the second hinge (711), the upper end of the turnover door assembly is inserted into the sixth socket (71124) of the second hinge (711) and can rotate in the sixth socket (71124), and the two ends of each telescopic rod (72) are respectively hinged with the turnover door assembly and the carriage.

2. The back door according to claim 1, characterized in that The turnover door assembly comprises a third hinge (712), a twelfth connecting piece (713), a thirteenth connecting piece (714), a fourteenth connecting piece (715) and a turnover door (716), the twelfth connecting piece (713) and the thirteenth connecting piece (714) are vertically arranged, the twelfth connecting piece (713) and the thirteenth connecting piece (714) are respectively provided with a U-shaped groove and are clamped and fixed on the left and right sides of the turnover door (716) through the U-shaped grooves; the third hinge (712) and the fourteenth connecting piece (715) are horizontally arranged, one end of the third hinge (712) is provided with a downward-opening U-shaped groove and is clamped and fixed on the upper side of the turnover door (716) through the U-shaped groove, and the other end of the third hinge (712) is hinged with the second hinge (711); the fourteenth connecting piece (715) is provided with a U-shaped groove opening upward and is clamped and fixed on the lower side of the turnover door (716) through the U-shaped groove.

3. A back door according to claim 2, characterized in that The rear side of the fourteenth connecting piece (715) is provided with a first eave (7151) rearward, the fourth connecting piece (713) is provided with a fifth sealing strip, and the thirteenth connecting piece (714) is provided with a sixth sealing strip.

4. The back door according to claim 1, wherein The second hinge (711) comprises a third connecting part (7111), a fourth connecting part (7112) and a fifth connecting part (7113), the third connecting part (7111) and the fifth connecting part (7113) are horizontally arranged, and the upper end of the fourth connecting part (7112) is vertically connected with the third connecting part (7111); the lower end of the fourth connecting part (7112) is vertically connected with the rear side of the fifth connecting part (7113), so that a U-shaped groove is formed between the third connecting part (7111), the fourth connecting part (7112) and the fifth connecting part (7113) and can be fixedly clamped on the rear end of the top of the carriage; the rear side of the fourth connecting part (7112) is provided with a first protruding part (71122) and a second protruding part (71123), a sixth socket (71124) opening rearward is formed between the first protruding part (71122) and the second protruding part (71123), and a first circular surface (711241), a stop surface (711242) and a second circular surface (711243) are sequentially arranged in the sixth socket (71124) from top to bottom, and the extension surface of the stop surface (711242) can pass through the center of the first circular surface (711241); The third hinge (712) comprises a sixth connecting part (7121), a seventh connecting part (7122), an eighth connecting part (7123) and a ninth connecting part (7124). The sixth connecting part (7121) and the eighth connecting part (7123) are vertically arranged. The upper end of the sixth connecting part (7121) and the upper end of the eighth connecting part (7123) are connected with the front and back sides of the seventh connecting part (7122) respectively, so that a U-shaped groove is formed between the sixth connecting part (7121), the seventh connecting part (7122) and the eighth connecting part (7123) and a clamping on the upper turnover door (716) can be fixed. The lower end of the ninth connecting part (7124) is connected with the seventh connecting part (7122), and the upper end of the ninth connecting part (7124) is provided with a first arc-shaped part (71241) and a second arc-shaped part (71242). One end of the first arc-shaped part (71241) is connected with the upper end of the ninth connecting part (7124), and the other end of the first arc-shaped part (71241) is a free end. The center of the first arc-shaped part (71241) is coincided with the center of the first circular arc surface (711241), and the outer diameter of the first arc-shaped part (71241) is matched with the diameter of the first circular arc surface (711241). The second arc-shaped part (71242) is arranged on the front side of the first circular arc surface (711241). The center of the second arc-shaped part (71242) is coincided with the center of the second circular arc surface (711243), and the outer diameter of the second arc-shaped part (71242) is matched with the diameter of the second circular arc surface (711243). The side of the second arc-shaped part (71242) close to the ninth connecting part (7124) and the side of the first arc-shaped part (71241) close to the ninth connecting part (7124) are provided with a stop groove (71243). The first arc-shaped part (71241) of the third hinge (712) is partially arranged in the sixth socket (71124) of the second hinge (711), the first protruding part (71122) of the second hinge (711) is located in the stop groove (71243) of the third hinge (712), and the second arc-shaped part (71242) is located at the second circular arc surface (711243) of the sixth socket (71124) of the second hinge (711) and can rotate in the second circular arc surface (711243).

5. A back door according to claim 4, characterized in that When the upper turnover door (716) is opened, the free end of the first arc-shaped part (71241) abuts against the stop surface (711242) in the sixth socket (71124), and at this time, the first protruding part (71122) of the second hinge (711) is still located in the stop groove (71243) of the third hinge (712). When the upper turnover door (716) is closed, the end of the first protruding part (71122) of the second hinge (711) away from the fourth connecting part (7112) abuts against the groove bottom of the stop groove (71243) of the third hinge (712), and at this time, the free end of the first arc-shaped part (71241) is still located in the sixth socket (71124).

6. A back door according to claim 4, characterized in that The front side of the fourth connecting part (7112) is provided with a recessed part (71121).

7. A back door according to claim 4, characterized in that The rear end of the third connecting part (7111) extends rearward to form a second rain eave (71111).

8. The back door according to claim 1, characterized in that The lower end of the lower turnover door assembly is hinged to the rear end of the chassis (1), and a telescopic rod is respectively hinged between the left and right sides of the lower turnover door assembly and the left and right sides of the carriage.

9. A vehicle bed, characterized by, A rear door comprising a rear door according to any one of claims 1-8.

10. A vehicle characterized by comprising: A carriage comprising a carriage according to claim 9.

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