Back door system and vehicle

Abstract

The invention provides a back door system and a vehicle. The back door system comprises a hinge assembly and a back door. The hinge assembly comprises a mounting base, a first connecting piece and a second connecting piece. The mounting seat is fixedly connected with a vehicle body of the vehicle; the first connecting piece and the mounting seat are rotationally connected at a first hinge point; the second connecting piece and the first connecting piece are connected to a second hinge point; the back door is connected with the second connecting piece; the second connecting piece is provided with a first position, a second position and a third position, when the second connecting piece is located at the first position, the back door is in a closed state, when the second connecting piece is located at the third position, the back door is in a maximum open state, and the second connecting piece passes through the second position in the process of moving from the first position to the third position; a first included angle is formed between the second connecting piece and the height direction of the vehicle body, and the first included angle when the second connecting piece is located at the second position is equal to the first included angle when the second connecting piece is located at the second position.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a tailgate system and vehicle. Background Technology

[0002] The tailgate, also known as the rear hatch, is the lid of the vehicle's trunk. It can be opened or closed manually or electrically. The tailgate is usually closed while the vehicle is in motion. When the vehicle stops, the user can open the tailgate to place or retrieve items from the trunk. Therefore, the tailgate is used frequently.

[0003] Some vehicles in related technologies use double-opening tailgates. Typically, both tailgates in a double-opening tailgate are connected to the vehicle body via a single-axis hinge. During the opening process, the two tailgates can only be opened sequentially in a fixed order; otherwise, motion interference will occur. Summary of the Invention

[0004] This application provides a tailgate system and vehicle designed to improve the problem that the two tailgates in a split tailgate can only be opened sequentially in a fixed order.

[0005] In a first aspect, this application provides a tailgate system for use in a vehicle, comprising:

[0006] A hinge assembly includes a mounting base, a first connector, and a second connector; the mounting base is fixedly connected to the vehicle body; the first connector is rotatably connected to the mounting base at a first hinge point; the second connector is connected to the first connector at a second hinge point; and...

[0007] The rear door is fixedly connected to the second connector;

[0008] The second connector has a first position, a second position, and a third position. When the second connector is in the first position, the tailgate is closed. When the second connector is in the third position, the tailgate is fully open. The second connector passes through the second position during its movement from the first position to the third position.

[0009] The second connector has a first angle with respect to the height direction of the vehicle body, and the first angle when the second connector is in the second position is equal to the first angle when the second connector is in the second position.

[0010] The solution provided in this application embodiment has a second connecting member with a first position, a second position, and a third position. The second connecting member passes through the second position during its movement from the first position to the third position, and the first included angle of the second connecting member 43 in the second position is equal to the first included angle of the second connecting member in the second position. This results in the second connecting member exhibiting an approximately translational motion trajectory during its movement from the first position to the second position. Correspondingly, the tailgate exhibits an approximately translational motion trajectory during its movement from the first closed position to the intermediate position. Taking the tailgate as an example of the vehicle's upper tailgate, the vehicle can also have a lower tailgate, which can be connected to the vehicle body via a single-axis hinge. This allows the lower tailgate to be opened independently by rotation. After opening, the tailgate moves upward and forward in an approximately translational manner. Thus, even if the lower tailgate remains closed, the tailgate can quickly separate from the vehicle body, forming a clearance. Afterward, the tailgate can be further opened by flipping. Therefore, the independent opening of the tailgate can be achieved. Both the rear tailgate and the other lower tailgate can be opened independently, so the order in which the two tailgates are opened is not restricted.

[0011] In conjunction with the first aspect, in some possible implementations, the hinge assembly further includes:

[0012] The third connector is connected to the second connector at a third hinge point, and the third connector is connected to the mounting base at a fourth hinge point;

[0013] Wherein, the distance from the first hinge point to the fourth hinge point, and the distance from the second hinge point to the third hinge point, are less than the distance from the first hinge point to the second hinge point, and the distance from the third hinge point to the fourth hinge point; the distance from the third hinge point to the fourth hinge point is less than the distance from the first hinge point to the second hinge point; during the process of the second connecting member moving from the second position to the third position, the first included angle gradually increases.

[0014] In combination with the first aspect and the above implementation methods, some possible implementation methods also include:

[0015] A first drive unit is mounted on the vehicle body and connected to the tailgate, for driving the tailgate to move relative to the vehicle body.

[0016] In combination with the first aspect and the above-described implementations, in some possible implementations, the mounting base includes:

[0017] The first mounting part is fixedly connected to the vehicle body;

[0018] A second mounting portion is connected to the first mounting portion and is located further away from the vehicle body relative to the first mounting portion along the thickness direction of the hinge assembly; a receiving gap is formed between the second mounting portion and the vehicle body;

[0019] One end of the first connector or the third connector is located within the receiving gap and is connected to the second mounting portion.

[0020] In combination with the first aspect and the above-described implementation methods, in some possible implementation methods, the rear door is provided with a groove;

[0021] The second connector includes:

[0022] A bent portion, the bent portion extending into the groove and fixedly connected to the groove wall;

[0023] The connecting part is connected to the bent part; the connecting part is connected to the first connecting member and the third connecting member.

[0024] In combination with the first aspect and the above implementation, in some possible implementations, one end of the first connector and one end of the third connector are respectively connected to both sides of the second mounting portion;

[0025] The other end of the first connector and the other end of the third connector are respectively connected to both sides of the connecting portion;

[0026] The first connector is located on the same side of the second mounting portion and the connecting portion.

[0027] In combination with the first aspect and the above-described implementation, in some possible implementations, the edges of the first connector and the third connector are provided with flanges.

[0028] In combination with the first aspect and the above-described implementation methods, in some possible implementations, the rear door includes:

[0029] Door top cover;

[0030] Two door side panels are provided, and the two door side panels are connected to both ends of the door top cover along the left-right direction of the vehicle body.

[0031] A tailgate, which is connected to one end of the door top cover along the front-rear direction of the vehicle body.

[0032] In combination with the first aspect and the above-described implementation, in some possible implementations, at least one of the door top cover, door side panel and door tail panel is provided with a window.

[0033] Secondly, this application also provides a vehicle, including:

[0034] Body; and

[0035] The tailgate system described in any of the first aspects above, wherein the tailgate is movably connected to the vehicle body via the hinge assembly. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a partial structural schematic diagram of a vehicle provided in an embodiment of this application;

[0038] Figure 2 yes Figure 1 A schematic diagram of a portion of the vehicle's structure from another perspective;

[0039] Figure 3 for Figure 2 Enlarged schematic diagram of the structure of section A in the middle;

[0040] Figure 4 for Figure 3 The diagram shows the motion process of the hinge assembly.

[0041] Figure 5 for Figure 3 A schematic diagram of the overall structure of the central hinge assembly;

[0042] Figure 6 for Figure 5 A schematic diagram of the mounting base in the hinge assembly;

[0043] Figure 7 for Figure 5 A schematic diagram of the structure of the second connector in the hinge assembly;

[0044] Figure 8 for Figure 5 A schematic diagram of the structure of the first connector in the hinge assembly;

[0045] Figure 9 for Figure 5 A schematic diagram of the third connector in the hinge assembly.

[0046] The annotations in the attached figures are explained as follows:

[0047] 1—Vehicle; 10—Body;

[0048] 20—Rear door; 21—Door top cover; 22—Door side panel; 221—Side window; 23—Door tail panel; 231—Rear window; 232—Sealing element;

[0049] 30—Lower back door;

[0050] 40—Hinge assembly; 41—Mounting base; 411—First mounting part; 412—Second mounting part; 42—First connector; 43—Second connector; 431—Bending part; 432—Connecting part; 44—Third connector; 441—Flange;

[0051] O1—First hinge point; O2—Second hinge point; O3—Third hinge point; O4—Fourth hinge point; α—First included angle. Detailed Implementation

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating 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.

[0055] The tailgate, also known as the rear hatch, is the lid of the vehicle's trunk. It can be opened or closed manually or electrically. The tailgate is usually closed while the vehicle is in motion. When the vehicle stops, the user can open the tailgate to place or retrieve items from the trunk. Therefore, the tailgate is used frequently.

[0056] Some vehicles in related technologies use a suicide tailgate. Typically, both tailgates are connected to the vehicle body via a single-axis hinge. During opening, the two tailgates can only be opened sequentially in a fixed order (e.g., open the first tailgate then the second, or vice versa). Otherwise, movement interference will occur. This is because, to achieve a good seal in the passenger compartment or trunk space, an overlap is usually provided between the first and second tailgates, or a seal is installed between them, or a combination of an overlap and a seal is used. When there is an overlap between the first and second tailgates, the tailgate on whichever tailgate has the overlap must be opened first; otherwise, the overlap will obstruct the opening of the other tailgate. Therefore, the two tailgates can only be opened sequentially. When a seal is provided between the first and second tailgates, the two tailgates also need to be opened in a fixed order; otherwise, movement interference between the seal and one of the tailgates will occur, leading to severe wear of the seal.

[0057] This application provides a tailgate system and vehicle, aiming to improve the flexibility of tailgate opening by addressing the problem that the two tailgates in a split tailgate can only be opened sequentially in a fixed order. The tailgate system provided in this application will now be described with reference to the accompanying drawings.

[0058] It should be noted that the terms "front" and "rear" mentioned in this article are relative to the vehicle; that is, the direction in which the front of the vehicle points is "front," and the direction in which the rear of the vehicle points is "rear."

[0059] Please refer to Figures 2 to 5 The rear door system proposed in this application includes a hinge assembly 40 and a rear door 20.

[0060] The hinge assembly 40 includes a mounting base 41, a first connector 42, and a second connector 43. The mounting base 41 is fixedly connected to the body 10 of the vehicle 1. The first connector 42 is rotatably connected to the mounting base 41 at a first hinge point O1. The second connector 43 is connected to the first connector 42 at a second hinge point O2. The tailgate 20 is fixedly connected to the second connector 43.

[0061] The second connecting member 43 has a first position, a second position, and a third position. When the second connecting member 43 is in the first position, the tailgate 20 is closed. When the second connecting member 43 is in the third position, the tailgate 20 is fully open. The second connecting member 43 passes through the second position during its movement from the first position to the third position. The second connecting member 43 has a first angle α with respect to the height direction 'a' of the vehicle body 10. The first angle α when the second connecting member 43 is in the second position is equal to the first angle α when the second connecting member 43 is in the second position.

[0062] Understandably, the tailgate 20 is fixedly connected to the second connector 43, which makes the movement trajectory of the tailgate 20 during the opening process the same as the movement trajectory of the second connector 43. The second connector 43 has a first position, a second position, and a third position. Correspondingly, the tailgate 20 has a first closed position, a transition position, and a first maximum opening position. When the tailgate 20 is in the first closed position, it is in a closed state; when the tailgate 20 moves to the first maximum opening position, it is in a maximum opening state. In addition, the transition position of the tailgate 20 corresponds to the second position of the second connector 43. That is, when the second connector 43 moves to the second position, the tailgate 20 moves to the transition position.

[0063] The solution provided in this application embodiment includes a second connecting member 43 having a first position, a second position, and a third position. The second connecting member 43 passes through the second position during its movement from the first position to the third position, and the first included angle α when the second connecting member 43 is in the second position is equal to the first included angle α when the second connecting member 43 is in the second position. This results in the second connecting member 43 exhibiting an approximately translational motion trajectory during its movement from the first position to the second position. Correspondingly, the tailgate 20 exhibits an approximately translational motion trajectory during its movement from the first closed position to the intermediate position. Taking the tailgate 20 as an example of the vehicle's upper tailgate, the vehicle can also have a lower tailgate 30, which can be connected to the vehicle body 10 via a single-axis hinge, allowing the lower tailgate 30 to be opened independently by rotation. After opening, the tailgate 20 moves upward and forward in a near-translational manner. This allows the tailgate 20 to quickly separate from the lower tailgate 30, creating a clearance, even if the lower tailgate 30 remains closed. The tailgate 20 can then be opened further by flipping. This allows the tailgate 20 to be opened independently. Both the tailgate 20 and the lower tailgate 30 can be opened individually, thus the opening order of the two tailgates is unrestricted.

[0064] The following combination Figures 1 to 5 The specific structure of the tailgate system and vehicle 1 will be described in detail.

[0065] See Figure 1 The vehicle 1 includes a body 10 and a tailgate system, the tailgate system including a hinge assembly 40 and a tailgate 20, the tailgate 20 being connected to the body 10 via the hinge assembly 40.

[0066] See Figure 1 and Figure 2The tailgate system can also include another tailgate in addition to tailgate 20. If tailgate 20 is the upper tailgate, the other tailgate is the lower tailgate 30. Tailgate 20 and lower tailgate 30 can form a split tailgate. Lower tailgate 30 can be connected to the vehicle body 10 via a single-axis hinge, allowing lower tailgate 30 to rotate relative to the vehicle body 10 between a second closed position and a second maximum open position. Furthermore, when tailgate 20 is in the first closed position and lower tailgate 30 is in the second closed position, tailgate 20 can dock with lower tailgate 30.

[0067] Among them, such as Figure 1 and Figure 2 As shown, the tailgate 20 may include a top cover 21, side panels 22, and a tailgate 23. There are two side panels 22, connected to both ends of the top cover 21 along the left-right direction of the vehicle body 10. The tailgate 23 is connected to one end of the top cover 21 along the front-rear direction of the vehicle body 10. To improve the visibility and lighting of the vehicle 1, at least one of the top cover 21, side panels 22, and tailgate 23 may be equipped with a window. See also... Figure 1 and Figure 2 The door side panel 22 can be provided with a side window 221, and the door tail panel 23 can be provided with a rear window 231; the door top cover 21 can also be provided with a skylight (not shown). In order to reduce blind spots and further improve lighting, the side window 221 and the rear window 231 can also be integrally formed. The structure of the lower tail door 30 can be similar to that of the rear tail door 20, and for the sake of brevity, it will not be described in detail here.

[0068] See Figure 5 A seal 232 can be provided at the bottom of the tailgate 23 of the rear tailgate 20. When the rear tailgate 20 is in the first closed position and the lower tailgate 30 is in the second closed position, the seal 232 will abut against the top of the lower tailgate 30, thereby sealing the trunk space. It can be understood that during the process of the rear tailgate 20 moving from the first closed position to the intermediate position, the seal 232 also moves upward and forward in an almost translational motion, thereby quickly separating from the lower tailgate 30. This helps to avoid wear between the seal 232 and the lower tailgate 30.

[0069] See Figure 3The hinge assembly 40 may include a mounting base 41, a first connecting member 42, and a second connecting member 43. The mounting base 41 is fixedly connected to the body 10 of the vehicle 1. The first connecting member 42 is rotatably connected to the mounting base 41 at a first hinge point O1. The second connecting member 43 is connected to the first connecting member 42 at a second hinge point O2. In some embodiments of this application, the vehicle further includes a first driving member, which can be mounted on the body 10 and connected to the tailgate 20, for driving the tailgate 20 to move relative to the body 10. The first driving member, in conjunction with the hinge assembly 40, allows the tailgate 20 to move relative to the body 10 between a first closed position, a mid-range position, and a first maximum open position. The first driving member may be a telescopic member, specifically a hydraulic push rod, a pneumatic push rod, an electric push rod, etc. Designers can select appropriate telescopic members as needed, which will not be elaborated upon in this application.

[0070] See Figure 2 and Figure 3 In some embodiments of this application, the hinge assembly 40 may further include a third connector 44 connected to the second connector 43 at a third hinge point O3, and the third connector 44 connected to the mounting base 41 at a fourth hinge point O4.

[0071] The distances from the first hinge point O1 to the fourth hinge point O4, and from the second hinge point O2 to the third hinge point O3, are less than the distances from the first hinge point O1 to the second hinge point O2, and from the third hinge point O3 to the fourth hinge point O4; the distance from the third hinge point O3 to the fourth hinge point O4 is less than the distance from the first hinge point O1 to the second hinge point O2; as the second connecting member 43 moves from the second position to the third position, the first included angle α gradually increases. Since the tailgate 20 and the second connecting member 43 have the same movement trajectory, as the tailgate 20 moves from the intermediate position to the first maximum opening position, the included angle between the tailgate 20 and the height direction of the vehicle body also gradually increases, thereby realizing the process of the tailgate 20 opening further by flipping.

[0072] The first included angle α between the second connecting member 43 and the height direction a of the vehicle body 10 refers to the included angle determined by the line connecting the second hinge point O2 and the third hinge point O3 and the height direction a of the vehicle body 10.

[0073] It should be noted that the mounting base 41 is fixedly connected to the vehicle body 10. During the movement of the hinge assembly 40, the position of the mounting base 41 remains fixed. The third connecting member 44 is rotatably connected to the mounting base 41 at the fourth hinge point O4, so the third connecting member 44 rotates relative to the mounting base 41 around the fourth hinge point O4. The second connecting member 43 is rotatably connected to the third connecting member 44 at the third hinge point O3, so the second connecting member 43 rotates with the third connecting member 44 around the third hinge point O3 relative to the mounting base 41.

[0074] During the movement of the tailgate 20 from the first closed position to the intermediate position, the first connecting member 42 rotates around the first hinge point O1, causing the tailgate 20 to move away from the vehicle body 10 or the lower tailgate 30 in the height direction of the vehicle body 10, and causing the tailgate 20 to move towards the front of the vehicle in the length direction of the vehicle body 10, creating a gap between the tailgate 20 and the vehicle body 10 or the lower tailgate 30. The tailgate 20 is fixedly connected to the second connecting member 43, which rotates around the second hinge point O2 relative to the third connecting member 44, enabling the tailgate 20 to rotate around the second hinge point O2, thus achieving the flipping of the tailgate 20 relative to the vehicle body 10. At this point, the first connecting member 42 and the third connecting member 44 jointly restrict the movement of the second connecting member 43. Since the distance from the third hinge point O3 to the fourth hinge point O4 is less than the distance from the first hinge point O1 to the second hinge point O2, when the angle of rotation of the first connecting member 42 around the first hinge point O1 is equal to the angle of rotation of the third connecting member 44 around the fourth hinge point, the movement path of the first connecting member 42 forming the position of the second hinge point O2 is significantly greater than the rotation path of the third connecting member 44 forming the position of the third hinge point O3. Consequently, the movement path of the second connecting member 43 hinged to the first connecting member 42 is greater than the movement path of the second connecting member 43 hinged to the third connecting member 44. In this way, the rotation direction of the second connecting member 43 around the second hinge point O2 can be opposite to the rotation direction of the first connecting member 42 around the first hinge point O1, thereby making the posture of the tailgate 20 in the intermediate position the same as its posture in the first closed position, thus achieving an approximate translational movement trajectory of the tailgate 20.

[0075] Figure 4 This diagram illustrates the shape changes of the hinge assembly 40 during the opening of the rear door 20. Solid lines represent the initial structural state of the hinge assembly 40, where the second connector 42 is in the first position. Dashed lines represent the structural state of the first connector 42, second connector 43, and third connector 44 when the rear door 20 is in the intermediate position, where the second connector 42 is in the second position. Single-dotted lines represent the structural state of the first connector 42, second connector 43, and third connector 44 when the line connecting the third hinge point O3 to the fourth hinge point O4 coincides with the line connecting the first hinge point O1 to the fourth hinge point O4, and when the mounting base 41 is in place. Double-dotted lines represent the structural state of the first connector 42, second connector 43, and third connector 44 when the first connector 42 and third connector 44 intersect.

[0076] In some embodiments of this application, when the tailgate 20 is in the first maximum opening position, the first connector 42 and the third connector 44 may be in a cross-shaped state, or the first connector 42 and the third connector 44 may be in a non-cross-shaped state. The specific state depends on the rotation angle of the first rearward direction relative to the vehicle body 10 when the tailgate 20 is in the first maximum opening position.

[0077] Please see Figure 5 and Figure 6 In some embodiments of this application, the mounting base 41 may include a first mounting portion 411 and a second mounting portion 412. The first mounting portion 411 is fixedly connected to the vehicle body 10; the second mounting portion 412 is connected to the first mounting portion 411, and along the thickness direction of the hinge assembly 40, the second mounting portion 412 is further away from the vehicle body 10 relative to the first mounting portion 411; in other words, the second mounting portion 412 protrudes outward relative to the first mounting portion 411. This creates a receiving gap between the second mounting portion 412 and the vehicle body 10. In this case, when the mounting base 41 is connected to the first connector 42 and the third connector 44, the receiving gap can provide mounting space. One end of the first connector 42 or the third connector 44 is located within the receiving gap and connected to the second mounting portion 412. For example, see... Figure 5 and Figure 6 One end of the first connector 42 can be installed within the receiving gap.

[0078] See Figure 5 and Figure 7 To achieve the connection between the second connector 43 and the rear door 20 while occupying only a small space, in some embodiments of this application, a groove (not shown in the figure) can be provided on the rear door 20. Correspondingly, the second connector 43 may include a bent portion 431 and a connecting portion 432 connected to the bent portion 431. The connecting portion 432 is connected to the first connector 42 and the third connector 44, and the bent portion 431 extends into the groove and is fixedly connected to the groove wall. Figure 7 As shown, the bent portion 431 and the connecting portion 432 are set at an angle. The included angle between the bent portion 431 and the connecting portion 432 can be determined according to the degree of recess of the groove, such as 60°, 90°, 120°, etc. Designers can design flexibly according to actual needs, and this application does not make specific limitations in this regard.

[0079] To avoid motion interference between components of the hinge assembly 40 during operation, in some embodiments of this application, one end of the first connecting member 42 and one end of the third connecting member 44 are respectively connected to both sides of the second mounting portion 412; the other ends of the first connecting member 42 and the third connecting member 44 are respectively connected to both sides of the connecting portion 432; the first connecting member 42 is located on the same side of the second mounting portion 412 and the connecting portion 432, while the third connecting member 44 is located on the opposite side from the same side of the second mounting portion 412 and the connecting portion 432. That is, the mounting base 41 and the second connecting member 43 are disposed between the first connecting member 42 and the third connecting member 44. Thus, when the hinge assembly 40 is in operation, the first connecting member 42 and the third connecting member 44 will not contact each other, thereby preventing motion interference.

[0080] Please see Figure 8 and Figure 9 To improve the rigidity of the first connector 42 and the third connector 44, in some embodiments of this application, flanges 441 may be provided at the edges of the first connector 42 and the third connector 44. To avoid affecting the movement of the first connector 42 and the third connector 44, the flanges 441 may be configured to face away from the mounting base 41 and the second connector 43. See also Figure 5 and Figure 9 The flange 441 of the third connector 44 faces away from the mounting base 41 and the second connector 43, that is, it is perpendicular to the paper and faces outwards in the figure. The flange 441 can surround the entire outer edge of the first connector 42 and the third connector 44, or it can be only part of the outer edge. Considering reducing the weight of the hinge assembly 40, while still meeting the rigidity requirements of the first connector 42 and the third connector 44, a portion of the flange 441, which is uniformly provided on the entire outer edge, can be cut off to form a shape like... Figure 8 and Figure 9 The outer edge of the portion shown is provided with a first connector 42 and a third connector 44 with a flange 441.

[0081] It is understood that the mounting base 41, the first connector 42, the second connector 43, and the third connector 44 of the hinge assembly 40 can constitute a crank-rocker mechanism or a multi-bar mechanism. In the crank-rocker mechanism, the mounting base 41 is the shortest link, and the sum of the lengths of the mounting base 41 and the first connector 42 is equal to the sum of the lengths of the second connector 43 and the third connector 44, thus satisfying the condition of the sum of the link lengths of the crank-rocker mechanism. It should be noted that the mounting base 41, the first connector 42, the second connector 43, and the third connector 44 can all include a main body and a reinforcing part, and the reinforcing part can be further configured as a reinforcing edge extending along at least part of the edge of the main body. When the mounting base 41, the first connector 42, the second connector 43, and the third connector 44 constitute the hinge assembly 40, they are all hinged through their respective main bodies.

[0082] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" 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 application 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0083] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A back door system applied to a vehicle, characterized by, The hinge assembly (40) comprises a mounting base (41), a first connecting member (42) and a second connecting member (43); the mounting base (41) is fixedly connected with a vehicle body (10); the first connecting member (42) is rotatably connected with the mounting base (41) at a first hinge point (O1); the second connecting member (43) is connected with the first connecting member (42) at a second hinge point (O2); and a back door (20) fixedly connected with the second connecting member (43); wherein the second connecting member (43) has a first position, a second position and a third position; when the second connecting member (43) is at the first position, the back door (20) is in a closed state; when the second connecting member (43) is at the third position, the back door (20) is in a maximum open state; and the second connecting member (43) passes through the second position during movement from the first position to the third position; the second connecting member (43) and the height direction of the vehicle body (10) form a first included angle; the first included angle when the second connecting member (43) is at the second position is equal to the first included angle when the second connecting member (43) is at the second position. The hinge assembly (40) further comprises:

2. The tailgate system of claim 1, wherein, a third connecting member (44) connected with the second connecting member (43) at a third hinge point (O3), and connected with the mounting base (41) at a fourth hinge point (O4); wherein the distance from the first hinge point (O1) to the fourth hinge point (O4) and the distance from the second hinge point (O2) to the third hinge point (O3) are less than the distance from the first hinge point (O1) to the second hinge point (O2) and the distance from the third hinge point (O3) to the fourth hinge point (O4); and the distance from the third hinge point (O3) to the fourth hinge point (O4) is less than the distance from the first hinge point (O1) to the second hinge point (O2); during movement of the second connecting member (43) from the second position to the third position, the first included angle gradually increases. Further comprising:

3. The tailgate system of claim 2, wherein, a first driving member mounted on the vehicle body (10) and connected with the back door (20), used for driving the back door (20) to move relative to the vehicle body (10). The mounting base (41) comprises:

4. The tailgate system of claim 2, wherein, a first mounting portion (411) fixedly connected with the vehicle body (10); a second mounting portion (412) connected with the first mounting portion (411) and farther away from the vehicle body (10) than the first mounting portion (411) in the thickness direction of the hinge assembly (40); and a receiving gap is formed between the second mounting portion (412) and the vehicle body (10); one end of the first connecting member (42) or the third connecting member (44) is located in the receiving gap and connected with the second mounting portion (412). The back door (20) is provided with a groove; 5. The tailgate system of claim 4, wherein, The second connecting member (43) comprises: ​ A bending part (431) extends into the groove and is fixed to the groove wall; A connecting part (432) is connected to the bending part (431); the connecting part (432) is connected to the first connecting piece (42) and the third connecting piece (44).

6. The tailgate system of claim 5, wherein, One end of the first connecting piece (42) and one end of the third connecting piece (44) are respectively connected to two sides of the second mounting part (412); The other end of the first connecting piece (42) and the other end of the third connecting piece (44) are respectively connected to two sides of the connecting part (432); The first connecting piece (42) is located on the same side of the second mounting part (412) and the connecting part (432).

7. The tailgate system of claim 4, wherein, The edges of the first connecting piece (42) and the third connecting piece (44) are provided with flanges (441).

8. The tailgate system according to any one of claims 1 to 7, characterized in that The back door (20) comprises: A door top cover (21); Two door side walls (22) connected to two ends of the door top cover (21) along the left-right direction of the vehicle body (10), and A door tail plate (23) connected to one end of the door top cover (21) along the front-rear direction of the vehicle body (10).

9. The tailgate system of claim 8, wherein, At least one of the door top cover (21), the door side wall (22) and the door tail plate (23) is provided with a window.

10. A vehicle characterized by comprising: Comprise: A vehicle body (10); and The back door (20) is movably connected to the vehicle body (10) through the hinge assembly (40). ​

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