Automobile tail gate pull cable winding mechanism and vehicle with same

Abstract

This utility model belongs to the field of automotive parts technology, and particularly relates to a tailgate cable retraction mechanism and a vehicle having the same. The mechanism includes a tension spring, a cable, and a guide rail. The tension spring is mounted on the tailgate, one end of the cable is connected to the tension spring, and the other end is connected to the vehicle body. The guide rail guides the cable along a set path. During tailgate opening, the cable moves downwards with the tailgate, pulling the tension spring to extend and providing retraction assistance to counteract the tailgate's weight. During tailgate closing, the tension spring retracts, pulling the cable back to its original position, assisting in the smooth closing of the tailgate. The tailgate cable retraction mechanism described in this application has a compact overall structure and can achieve energy regulation and gravity balance during tailgate movement without introducing complex electronic control structures. It effectively reduces drive load, improves tailgate operation smoothness and system lifespan, and is suitable for various tailgate systems, especially for downward-opening or multi-tiered tailgate structures.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, and in particular relates to a tailgate cable rewinding mechanism and a vehicle having the same. Background Technology

[0002] With the continuous development of the automotive industry and the increasing demands of consumers for intelligence and convenience, the design of car tailgates is evolving towards multi-functionality and high reliability. As an important component of the vehicle structure, the tailgate not only undertakes basic functions such as sealing, shielding, and safety protection, but its opening and closing performance also directly affects the overall user experience and perceived quality of the vehicle. In existing technologies, the opening and closing of tailgates mainly relies on mechanical drive components in conjunction with electronic control systems. Especially in the design of top-and-bottom tailgates, how to provide reliable and balanced opening and closing support within a limited space is one of the key issues that urgently need to be addressed in automotive engineering design.

[0003] Currently, the tailgate opening and closing mechanisms widely used in the market typically employ a strut structure as the main drive unit for opening and closing the tailgate. This type of strut mechanism generally consists of components such as a motor, push rod, and controller, utilizing the extension and retraction of the push rod to drive the tailgate to open and close. For example, the applicant's previously filed Chinese patent with publication number CN119102449A discloses a multi-mode drive mechanism for a vehicle tailgate. By setting up a drive shaft, hinge assembly, latch assembly, and auxiliary drive assembly, it achieves two opening modes for the tailgate: downward tilting and side tilting, aiming to improve the adaptability and flexibility of the tailgate in different usage scenarios. The design focus of this device is on the variability of the tailgate opening angle and direction, which has certain advantages in improving diversified operations.

[0004] However, although existing technologies such as electric struts, sliding rail guides, and electromagnetic locks have largely met the basic opening and locking functions of tailgates, the lack of a structure to effectively distribute the weight during tailgate opening remains a common shortcoming. Specifically, during tailgate opening, as a large, heavy covering, the tailgate's weight continuously applies a load to the drive mechanism. If the strut mechanism lacks an auxiliary structure to balance the tailgate's weight, the motor must overcome the resistance from the entire weight, causing the drive components to operate under high load for extended periods. This not only significantly increases energy consumption and mechanical wear but also easily leads to reduced opening and closing force and component aging during long-term use, reducing the overall lifespan and stability of the system.

[0005] Therefore, based on long-term R&D practice and market demand insights, the applicant recognizes the need to further optimize the tailgate opening and closing mechanism, especially in terms of improving the gravity balance capability and mechanism response stability during tailgate opening. It is necessary to introduce a technical solution that combines structural simplicity and high adaptability to meet the comprehensive requirements of modern automobiles for tailgate systems in terms of high performance, low energy consumption, and long service life. Utility Model Content

[0006] This utility model aims to solve the problems of existing car tailgates lacking a gravity balance auxiliary structure, having a large drive load, and being prone to wear during opening. It discloses a compact and reasonably laid-out car tailgate cable retraction mechanism and a vehicle equipped with it. The mechanism consists of a tension spring, a guide rail, and symmetrical cables. It can provide retraction assistance during tailgate opening and buffer guidance during closing, thereby effectively reducing the motor load, improving the smoothness and stability of tailgate operation, extending the system's service life, and enhancing the overall vehicle user experience.

[0007] In view of this, the present invention provides a car tailgate cable rewind mechanism, comprising:

[0008] A tension spring, fixedly installed on the tailgate, can extend or retract;

[0009] A cable, with one end connected to the tension spring and the other end connected to the vehicle body, is used to transmit force during the opening and closing of the tailgate;

[0010] The guide rail, installed on the tailgate, is used to guide the pull cable to move along a set trajectory during the opening and closing of the tailgate;

[0011] During the opening of the tailgate, the pull cable is pulled as the tailgate flips downward, which in turn stretches the tension spring to provide a retraction force and counteract the weight of the tailgate itself. When the tailgate is closed, the tension spring is in a contracted state.

[0012] As a preferred example of this application, the tension spring is fixed to the tailgate and arranged near the center of the tailgate in a direction perpendicular to the rotation direction of the tailgate. The pull cable includes a first pull cable and a second pull cable, which are respectively arranged on opposite sides of the tension spring. The guide rail includes a first slide rail and a second slide rail, which are respectively used to guide the first pull cable and the second pull cable. The first pull cable and the second pull cable are respectively passed through the corresponding first slide rail and second slide rail and connected to the positions on opposite sides of the tailgate of the vehicle body.

[0013] As a preferred example of this application, the guide rail includes a rail housing, and a sliding channel is provided inside the rail housing. The rail housing includes an arc-shaped guide portion, and a first opening and a second opening are respectively provided on opposite sides of the arc-shaped guide portion. The first opening and the second opening are in communication with the sliding channel.

[0014] As a preferred example of this application, the central axis of the first opening is set at a 90° angle to the central axis of the second opening.

[0015] As a preferred example of this application, the central axis of the first opening is aligned with the stretching direction of the tension spring, and the plane formed by the line connecting the center point of the second opening and the fixed end of the cable body is arranged perpendicular to the central axis of the first opening.

[0016] As a preferred example of this application, the first opening is arranged in a funnel-shaped contraction from the end away from the arc-shaped guide to the end closer to the arc-shaped guide, and the second opening is arranged in a funnel-shaped contraction from the end away from the arc-shaped guide to the end closer to the arc-shaped guide.

[0017] As a preferred example of this application, the pull cable includes a pull cable body, and a first connector and a second connector are respectively provided at opposite ends of the pull cable body, wherein the first connector is detachably connected to one end of the tension spring, and the second connector is detachably connected to the vehicle body.

[0018] As a preferred example of this application, at least one of the first connector and the second connector has an outer contour dimension smaller than the minimum cross-sectional area of ​​the sliding channel.

[0019] This application also discloses a vehicle, including a body assembly, a tailgate assembly, and a cable winding mechanism. The cable winding mechanism is an automotive tailgate cable winding mechanism as described above, which is disposed between the body assembly and the tailgate assembly. It is used to stretch the tension spring during the opening of the tailgate assembly to provide a retraction force and offset part of the weight of the tailgate assembly.

[0020] As a preferred example of this application, the tailgate device includes a downward-opening tailgate that can be rotated downwards independently, or the tailgate device includes an upward-opening top door and a downward-opening tailgate that serves as the bottom door in the top and bottom door configuration, and the cable winding mechanism is encapsulated on the downward-opening tailgate and connected to the vehicle body assembly via cables extending from both ends.

[0021] Compared with the prior art, the automobile tailgate cable rewind mechanism and the vehicle having the present invention have the following advantages:

[0022] This application constructs a complete retraction mechanism by setting a tension spring and two symmetrically arranged pull cables on the tailgate, along with a guide rail. When the tailgate opens downwards, the pull cables stretch the tension spring along a preset trajectory to store energy, thereby providing an upward retraction force to partially offset the weight of the tailgate. This avoids the load pressure from the motor or manual operation of having to overcome the full weight, improving the effort-saving effect during tailgate opening. At the same time, the guide rail precisely guides the pull cable path, preventing the pull cable from swaying, deviating, or tangling, ensuring the consistency and stability of the tailgate's path during operation, improving the user's opening experience, and laying the foundation for elastic return force for subsequent closing operations. The overall structure is compact and can achieve energy regulation and gravity balance during tailgate movement without introducing a complex electronic control structure. It is suitable for various vehicle types, especially in tailgate structures with limited space, and has excellent structural adaptability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the automobile tailgate cable rewind mechanism in the retracted state according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the car tailgate cable rewind mechanism in the extended state according to an embodiment of the present invention;

[0025] Figure 3 This is a top view of the tailgate cable retraction mechanism according to an embodiment of the present invention.

[0026] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0027] Figure 5 This is a schematic diagram of the tailgate in the closed state when the tailgate cable retraction mechanism described in this application is used.

[0028] Figure 6 This is a schematic diagram of the tailgate in the open state when the tailgate cable retraction mechanism described in this application is used.

[0029] The markings in the diagram are as follows:

[0030] 100-Wire winding mechanism; 200-Body assembly; 300-Tailgate assembly; 400-Downward-opening tailgate; 1-Tension spring; 2-Wire; 21-First wire; 22-Second wire; 201-Wire body; 202-First connector; 203-Second connector; 3-Guide rail; 31-First rail; 32-Second rail; 33-Rail housing; 34-Sliding channel; 301-Arc-shaped guide; 302-First opening; 303-Second opening. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0032] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; 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 based on the specific circumstances.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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 may be combined in any suitable manner in one or more embodiments or examples.

[0035] like Figures 1-6 As shown, this application discloses a car tailgate cable rewind mechanism, comprising:

[0036] Tension spring 1 is fixedly installed on the tailgate and can extend or retract.

[0037] The pull cable 2 is connected at one end to the tension spring 1 and at the other end to the vehicle body, and is used to transmit force during the opening and closing of the tailgate;

[0038] Guide rail 3 is installed on the tailgate to guide the pull cable 2 to move along a set trajectory during the opening and closing of the tailgate;

[0039] During the opening of the tailgate, the pull cable 2 is pulled as the tailgate flips downward, which in turn causes the tension spring 1 to stretch to provide a retraction force and counteract the weight of the tailgate itself. When the tailgate is closed, the tension spring 1 is in a contracted state.

[0040] The tailgate cable rewinding mechanism disclosed in this application is designed based on the principles of simple structure and coordinated function. It includes a tension spring 1 installed on the tailgate, a cable 2 connected to it, and a guide rail 3 arranged on the tailgate. One end of the tension spring 1 is fixedly connected to the tailgate structure, and the other end is connected to the vehicle body through the cable 2. The guide rail 3 is set on the tailgate to regulate the movement path of the cable 2 during the opening or closing of the tailgate. In actual use, when the user pulls up the tailgate, the tailgate rotates around the vehicle body hinge, causing the guide rail 3 and tension spring 1 installed on the tailgate to move accordingly. Since one end of the pull cable 2 is connected to the vehicle body and the other end is connected to the tension spring 1 inside the tailgate, the rotation of the tailgate will pull the pull cable 2 to slide along the guide rail 3 and gradually stretch the tension spring 1. The stretching process of the tension spring 1 stores elastic potential energy, which continuously provides a portion of the backward retraction force as the tailgate continues to open, effectively offsetting the load pressure caused by the weight of the tailgate on the drive system or user operation. When the user or the electronic control system drives the tailgate to close, the tension spring 1 gradually retracts with the assistance of the guide rail 3, and the pull cable 2 is also simultaneously pulled back to the initial position of the guide rail 3, forming a closed-loop assist process. This achieves the coordinated release of the balancing force and buffer force during the opening and closing of the tailgate. The entire mechanism can naturally cooperate with the tailgate movement to complete the assist and return without complex electronic control.

[0041] The tailgate cable retraction mechanism provided in this application can effectively provide auxiliary retraction force during tailgate opening. In electric drive scenarios, it can reduce the burden on the motor and extend its life. The guide rail 3 ensures that the cable 2 always slides along the set path during tailgate movement to avoid jamming or tangling, thereby enhancing the consistency and reliability of tailgate operation. The mechanism has a compact structure, low manufacturing cost, and strong adaptability. It not only improves the user experience but also extends the service life of the tailgate system. It effectively improves the problems of overload of the drive system, tailgate shaking, or severe wear caused by the lack of gravity balance in traditional strut structures.

[0042] As a preferred example of this application, the tension spring 1 is fixed to the tailgate and arranged near the center of the tailgate in a direction perpendicular to the rotation direction of the tailgate. Two pull wires 2 are provided, namely a first pull wire 21 and a second pull wire 22. The first pull wire 21 and the second pull wire 22 are respectively provided on opposite sides of the tension spring 1. Two guide rails 3 are provided, namely a first rail 31 and a second rail 32. The first pull wire 21 and the second pull wire 22 pass through the first rail 31 and the second rail 32 respectively and are fixed to the vehicle body on opposite sides of the tailgate. Based on the overall cable retraction mechanism, this application further optimizes the spatial arrangement of the tension spring 1, the cable 2, and the guide rail 3. By installing the tension spring 1 in the middle of the inner side of the tailgate and setting it in a direction perpendicular to the rotation direction of the tailgate, the retraction force generated by the tension spring 1 on the tailgate is made more central and balanced. Two cables, namely the first cable 21 and the second cable 22, are symmetrically arranged on the left and right sides of the tension spring 1, and each cable is independently threaded in the first rail 31 and the second rail 32. This allows the two cables to move synchronously and smoothly when the tension spring 1 is stretched or contracted. The two guide rails 3 are fixed on both sides of the tailgate to guide the cables to move along a specific path. The other end of the cable 2 is connected to the corresponding two sides of the vehicle body and the tailgate, forming a double-sided force system with the center of the tailgate as the axis of symmetry. This not only improves the force transmission efficiency during the opening and closing of the tailgate, but also enhances the dynamic stability of the structure, which is conducive to the long-term smooth operation and precise reset of the tailgate.

[0043] The above configuration, by placing the tension spring 1 in the center of the tailgate and arranging it perpendicular to the direction of rotation, and symmetrically placing two pull lines on both sides of it, passing through the left and right slide rails respectively and connecting them to the sides of the vehicle body, achieves symmetry of the force path and equalization of the tension distribution during the opening and closing of the tailgate. When the tailgate is opened, the pull lines on both sides synchronously pull the tension spring 1 and provide a uniform retraction force, avoiding the tailgate from shaking, deflecting or jamming due to uneven force, thus improving the smoothness of operation when the user opens the tailgate. During the closing process, the retraction of the tension spring 1 causes the tailgate to close along a smooth trajectory, which not only protects the integrity of the structure at the connection between the tailgate and the vehicle body, but also improves the sealing and appearance consistency of the entire vehicle. At the same time, the slide rail guides the path of the pull lines, ensuring that the pull lines always run smoothly without the risk of tangling, effectively extending the service life of the system and reducing failures caused by component wear. The overall structure is reasonable, stable and reliable, and easy to install. It is suitable for various vehicle platforms with downward-flipping tailgates and can be widely used in tailgate opening and closing systems of SUVs, MPVs and light commercial vehicles.

[0044] As a preferred example of this application, the guide rail 3 includes a rail housing 33, and a sliding channel 34 is provided inside the rail housing 33. The rail housing 33 includes an arc-shaped guide portion 301, and a first opening portion 302 and a second opening portion 303 are respectively provided on opposite sides of the arc-shaped guide portion 301. The first opening portion 302 and the second opening portion 303 communicate with the sliding channel 34. In the example of this application, the structural design of the guide rail 3 is further optimized to address the issue of controlling the cable path during tailgate movement. Specifically, it adopts a combined structure including a rail housing 33 and a sliding channel 34. The rail housing 33 is a hollow shell structure with a smooth and continuous sliding channel 34 inside. This channel runs through the entire rail housing 33 and is used to accommodate the cable 2 sliding through. The sliding channel 34 provides a path constraint similar to a closed track, ensuring that the cable 2 always slides in a controlled manner within a limited space. A section of arc-shaped guide 301 is provided at a key part of the rail housing 33 to achieve directional transition and flexible guidance of the cable 2 under space constraints. A first opening 302 and a second opening 303 are respectively opened on opposite sides of the arc-shaped guide 301. During tailgate movement, the cable 2 enters the sliding channel 34 from one side opening of the rail housing 33 and smoothly transitions direction under the guidance of the arc-shaped guide 301, finally extending to the vehicle body fixing point from the other side opening.

[0045] Through the structural design of the guide rail 3, the pull cable 2 is always in a controlled and stable guide path throughout the entire tailgate opening and closing process. This design not only eliminates the risk of free swinging of the pull cable 2 during operation, avoiding tangling, wear, or even breakage of the pull cable due to derailment or uneven force, but also effectively avoids problems such as tailgate opening and closing jamming, noise, or incomplete tailgate sealing caused by pull cable 2 disturbance. At the same time, the rail housing 33 provides good coverage and protection for the pull cable 2, reducing the probability of friction and collision between the pull cable 2 and other tailgate components, significantly improving the service life of the pull cable 2 and the stability of the tailgate system, and further optimizing the smoothness and user experience when the tailgate is opened and closed.

[0046] As a preferred example of this application, the central axis of the first opening 302 is set at a 90° angle to the central axis of the second opening 303. In the example of this application, the geometric relationship of the openings in the guide rail 3 is further optimized. Specifically, the first opening 302 and the second opening 303 at both ends of the rail housing 33 are designed to be arranged at a 90° angle to each other, that is, the central axes of the two openings are perpendicular to each other. When the pull cable 2 enters the sliding channel 34 from the first opening 302, it is gradually guided by the arc-shaped guide 301 to change direction during the internal sliding process, and finally outputs from the second opening 303 perpendicular to it. The entire movement path transitions from a straight line to an arc, and then turns to a vertical output direction, forming a right-angle change trajectory in space. The pull cable 2 achieves a smooth turn by relying on the continuous curve of the arc-shaped guide 301, avoiding the risks of jamming or obstruction caused by sharp turns or sudden spatial changes, ensuring the consistency of direction and coordination of movement when the pull cable 2 and the tension spring 1 transmit the tension, so that the mechanical system in the opening and closing process of the tailgate always maintains a good response.

[0047] As a preferred example of this application, the central axis of the first opening 302 is aligned with the stretching direction of the tension spring 1, and the plane formed by the line connecting the center point of the second opening 303 and the fixed end of the pull wire 2 on the vehicle body is arranged perpendicular to the central axis of the first opening 302. This design further optimizes the geometric arrangement of the guide rail 3. The first opening 302 on the rail housing 33 aligns its central axis with the stretching direction of the tailgate tension spring 1, allowing the cable 2 to seamlessly connect with the movement direction of the tension spring 1 when entering the sliding channel 34 from this opening. This minimizes friction angle and path loss during entry. Simultaneously, the plane formed by the line connecting the center point of the second opening 303 and the cable 2 at the fixed end of the vehicle body is perpendicular to the central axis of the first opening 302. This creates a spatial "L-shaped" guide structure. This design allows the cable 2 to start from the tension spring 1, enter the rail in the first direction, and then, after being guided by bending, precisely connect with the fixed point of the vehicle body in an orthogonal direction. In this path, the cable 2 can smoothly transition directions while minimizing torque consumption and path deviation, achieving precise control of direction conversion.

[0048] As a preferred example of this application, the first opening 302 is arranged in a flared shape from the end away from the arc-shaped guide 301 toward the end closer to the arc-shaped guide 301, and the second opening 303 is arranged in a flared shape from the end away from the arc-shaped guide 301 toward the end closer to the arc-shaped guide 301. This design further optimizes the opening structure for the introduction and exit of the pull cable 2. The first opening 302 and the second opening 303 of the guide rail 3 are arranged with a flared, contracting structure. Each opening has a larger opening area at the end furthest from the arc-shaped guide 301, gradually narrowing towards the sliding channel 34 to form a transitional guide section with a converging function. This structure is equivalent to setting a "tolerance cone" or "funnel" before the pull cable enters the arc-shaped channel. This allows the pull cable 2 to be received by the larger diameter area and gradually guided in the correct direction even if there is a slight deviation when the tailgate is opened or closed, thus smoothly guiding it into the sliding channel 34 for turning motion. This avoids entry failure or friction jamming caused by pull cable 2 vibration, misalignment, or external disturbance. It also reduces the contact stress between the pull cable 2 and the edge. Therefore, without increasing the size of the mechanism, the overall structure significantly improves the guiding efficiency of the pull cable 2 and the system's fault tolerance, preventing problems such as cable jamming, breakage, and entanglement caused by alignment difficulties, angle deviations, or vibration interference.

[0049] As a preferred example of this application, the pull cable 2 includes a pull cable body 201, with a first connector 202 and a second connector 203 respectively provided at opposite ends of the pull cable body 201. The first connector 202 is detachably connected to one end of the tension spring 1, and the second connector 203 is detachably connected to the vehicle body. To further improve the ease of operation of the tailgate pull cable rewind mechanism during assembly, maintenance, and replacement, the two ends of the pull cable 2 are designed with a first connector 202 for quick and detachable connection to the tension spring 1 and a second connector 203 for quick and detachable connection to the vehicle body positioning point. This detachable connection structure can adopt mature structural forms such as elastic pin type, screw type, snap type, or rotary locking type, facilitating the rapid completion of the tension closed loop construction between the tension spring 1, pull cable 2, and vehicle body during the assembly stage of the tailgate pull cable rewind mechanism, and enabling convenient operation during subsequent maintenance or repair. Replacement only requires loosening the connector to decouple the unit, without disassembling the tailgate or other structural components. This significantly improves the independence, maintenance efficiency, and module replacement flexibility of the cable assembly, greatly reducing maintenance time and costs. It also enhances the maintainability and product lifecycle adaptability of the tailgate cable retraction mechanism. Furthermore, this connection structure gives the cable assembly greater interchangeability and standardization, which is conducive to unifying parts specifications, reducing inventory management costs, and ensuring that the tailgate cable retraction mechanism maintains good force transmission and structural integrity during long-term operation.

[0050] As a preferred example of this application, at least one of the first connector 202 and the second connector 203 has an outer contour dimension smaller than the minimum cross-sectional area of ​​the sliding channel 34. In the example of this application, in order to further improve the versatility and convenience of the pull cable assembly during installation, debugging and maintenance, the size structure of the connector on the pull cable 2 has been optimized, that is, the outer contour dimension of the first connector 202 and / or the second connector 203 is set to be smaller than the cross-sectional area of ​​the narrowest part of the sliding channel 34, so that at least one connector can pass smoothly through the sliding channel 34 of the guide rail 3 without damaging the structure. This not only allows the connector and pull cable body to be flexibly inserted, positioned and adjusted during the final assembly, but also allows for insertion into the channel from the opening of the rail for operation during later maintenance, without disassembling the tailgate shell or the rail structure, greatly simplifying the degree of structural intervention.

[0051] This application also discloses a vehicle, including a body assembly 200, a tailgate assembly 300, and a cable winding mechanism 100. The cable winding mechanism 100 adopts the automobile tailgate cable winding mechanism as described in the above embodiment. It is disposed between the body assembly 200 and the tailgate assembly 300 and is used to stretch the tension spring 1 during the opening of the tailgate assembly 300 to provide a retraction force and offset part of the weight of the tailgate assembly 300. This application integrates the aforementioned tailgate cable retraction mechanism into the vehicle. When the tailgate is opened, the tailgate rotates around the hinge axis mounted on the vehicle body, and the tailgate's own weight generates a downward rotational torque. At this time, the tension spring 1 in the cable retraction mechanism 100 is stretched synchronously, and the elastic force accumulates and is transmitted to both sides of the tailgate through the symmetrically arranged cables 2 on the left and right sides. This elastic force and the tailgate's weight form a force in opposite direction, partially offsetting each other, thereby reducing the tailgate's downward tendency and greatly reducing the operating force required by the user during the tailgate opening process. When the tailgate is closed, the tension spring 1 returns from the stretched state to its original contracted state. During its retraction process, it continuously drives the cable to pull the tailgate to rotate, pushing the tailgate to gradually return to the closed position. Throughout the entire movement, the tension spring 1 is always in a dynamic adjustment state, providing an appropriate amount of retraction force according to the current angle of the tailgate. This not only ensures the buffering effect of the tailgate during the closing process but also effectively avoids tailgate collisions or damage caused by uncontrolled descent, ensuring that the opening and closing process is stable, smooth, and easy to operate, thus improving the stability and safety of the entire vehicle tailgate system during use.

[0052] As a preferred example of this application, the tailgate device 300 includes a downward-opening, fold-down tailgate 400. The cable winding mechanism 100 is encapsulated on the fold-down tailgate 400 and connected to the vehicle body device 200 via cables 2 extending from both ends, thereby balancing part of the weight when the fold-down tailgate 400 is opened downwards. In the example of this application, the tailgate device 300 includes a downward-opening, fold-down tailgate 400 that can be opened downwards around its lower hinge. The cable winding mechanism 100 is entirely encapsulated within the internal structural space of the fold-down tailgate 400. When the fold-down tailgate 400 is in the closed state, the cable 2 is in the retracted state, and the tension spring 1 is in the initial state. As the fold-down tailgate 400 flips downwards around the hinge point to open, the cable 2 is gradually pulled out as the fold-down tailgate 400 rotates, driving the internal tension spring 1 to generate tension. The extension and deformation generate a corresponding elastic return force, which reacts through the pull wire 2 onto the downward-opening tailgate 400. This causes part of the weight of the downward-opening tailgate 400 to be offset by the elastic force of the tension spring 1 during downward rotation, making the opening and closing of the downward-opening tailgate 400 easier and smoother. This avoids collision and wear caused by the weight of the tailgate. At the same time, the pull wire winding mechanism 100 is located inside the downward-opening tailgate 400, avoiding reliability issues such as rainwater erosion and dust accumulation caused by exposed mechanisms, and effectively extending the service life of the components. Furthermore, the downward-opening tailgate 400 can be installed as a separate structure at the rear of the vehicle, or it can be combined with the upward-opening tailgate to form a top-and-bottom tailgate structure. In the top-and-bottom tailgate structure, the downward-opening tailgate 400, as the bottom door, can maintain the independent operation and stable working state of the cable winding mechanism 100 even when the top door is open or closed alone, without relying on the posture of the top door. This ensures that the downward-opening tailgate 400 always has good rotational smoothness and weight balance, improves the adaptability and operational reliability of the overall tailgate system, provides more structural options for different vehicle configurations, and meets the multiple requirements of different vehicles for tailgate lightweighting, humanization, and high reliability.

[0053] This application, by setting a simple and controlled-guided cable retraction mechanism 100 on the downward-flipping tailgate, cleverly combines the coordinated operation of the tension spring 1, the cable 2, and the guide rail 3 to achieve a complete action process in which the tension spring 1 is automatically stretched to provide retraction assistance when the tailgate is opened, and the tension spring 1 retracts to drive the tailgate to slowly return to its original position when it is closed. The structure is compact, the operation is smooth, the installation is flexible, and the maintenance is convenient. It can be used alone in the downward-flipping tailgate 400 to provide gravity balance, or it can be used as an independent support system for the bottom door in the top and bottom door structure. It effectively reduces the user's opening burden, reduces the electric drive load, extends the system life, and improves the overall performance of the vehicle in terms of user comfort, structural adaptability, and operational reliability.

[0054] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A car tailgate cable rewind mechanism, characterized in that, include: A tension spring (1) is fixedly installed on the tailgate and can extend or retract. A pull cable (2) is connected at one end to the tension spring (1) and at the other end to the vehicle body, and is used to transmit force during the opening and closing of the tailgate; The guide rail (3) is set on the tailgate to guide the pull line (2) to move along the set trajectory during the opening and closing of the tailgate; During the opening of the tailgate, the pull cable (2) is pulled as the tailgate flips downward, which in turn drives the tension spring (1) to stretch to provide a retraction force and counteract the weight of the tailgate itself. When the tailgate is closed, the tension spring (1) is in a contracted state.

2. The automobile tailgate cable rewind mechanism according to claim 1, characterized in that, The tension spring (1) is fixed on the tailgate and arranged in a direction perpendicular to the rotation direction of the tailgate near the middle of the tailgate. The pull cable (2) includes a first pull cable (21) and a second pull cable (22), which are respectively arranged on opposite sides of the tension spring (1). The guide rail (3) includes a first rail (31) and a second rail (32), which are respectively used to guide the first pull cable (21) and the second pull cable (22). The first pull cable (21) and the second pull cable (22) are respectively passed through the corresponding first rail (31) and second rail (32) and then connected to the positions on opposite sides of the tailgate of the vehicle body.

3. The automobile tailgate cable rewind mechanism according to claim 1, characterized in that, The guide rail (3) includes a rail housing (33), and a sliding channel (34) is provided inside the rail housing (33). The rail housing (33) includes an arc-shaped guide portion (301), and a first opening portion (302) and a second opening portion (303) are respectively provided on opposite sides of the arc-shaped guide portion (301). The first opening portion (302) and the second opening portion (303) are connected to the sliding channel (34).

4. The automobile tailgate cable rewind mechanism according to claim 3, characterized in that, The central axis of the first opening (302) is set at a 90° angle to the central axis of the second opening (303).

5. The automobile tailgate cable rewind mechanism according to claim 3, characterized in that, The central axis of the first opening (302) is consistent with the stretching direction of the tension spring (1), and the plane formed by the line connecting the center point of the second opening (303) and the fixed end of the pull wire (2) on the vehicle body is arranged perpendicular to the central axis of the first opening (302).

6. The automobile tailgate cable rewind mechanism according to claim 3, characterized in that, The first opening (302) is arranged in a flared shape from the end away from the arc-shaped guide (301) toward the end closer to the arc-shaped guide (301), and the second opening (303) is arranged in a flared shape from the end away from the arc-shaped guide (301) toward the end closer to the arc-shaped guide (301).

7. The automobile tailgate cable rewind mechanism according to any one of claims 1 to 6, characterized in that, The pull cable (2) includes a pull cable body (201), and a first connector (202) and a second connector (203) are respectively provided at opposite ends of the pull cable body (201). The first connector (202) is detachably connected to one end of the tension spring (1), and the second connector (203) is detachably connected to the vehicle body.

8. The automobile tailgate cable rewind mechanism according to claim 7, characterized in that, At least one of the first connector (202) and the second connector (203) has an outer contour dimension smaller than the minimum cross-sectional area of ​​the sliding channel (34) in the guide rail (3).

9. A vehicle, characterized in that, The device includes a body assembly (200), a tailgate assembly (300), and a cable winding mechanism (100). The cable winding mechanism (100) is an automobile tailgate cable winding mechanism as described in any one of claims 1 to 8. It is disposed between the body assembly (200) and the tailgate assembly (300) and is used to stretch the tension spring (1) during the opening of the tailgate assembly (300) to provide a retraction force and offset part of the weight of the tailgate assembly (300).

10. The vehicle according to claim 9, characterized in that, The tailgate assembly (300) includes a downward-opening tailgate (400) that can be rotated downwards, or the tailgate assembly (300) includes an upward-opening top door and a downward-opening tailgate (400) that serves as the bottom door in the top and bottom door configuration. The cable winding mechanism (100) is encapsulated on the downward-opening tailgate (400) and connected to the body assembly (200) via cables (2) extending from both ends.

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