Lower electric drive structure of vehicle sliding door and vehicle

Abstract

The application relates to a lower electric driving structure of a vehicle sliding door, and belongs to the technical field of sliding door opening and closing devices.The lower electric driving structure comprises a synchronous belt, a front guide wheel set, a rear guide wheel set, a driving wheel set, a driving piece, a tensioning piece and a lower hinge connecting piece; the front guide wheel set and the rear guide wheel set are arranged close to two ends of a lower hinge guide groove respectively; the synchronous belt forms a loop transmission path which is unfolded along the height direction of a pedal vertical plate; the synchronous belt comprises a guide groove matching section, and the guide groove matching section is arranged along the groove track of the lower hinge guide groove; the driving piece is used for driving the driving wheel set, so that the synchronous belt moves along the loop transmission path; and the lower hinge connecting piece is connected with the guide groove matching section and the lower hinge. The application has the effects that the synchronous belt can reduce the occupation of the continuous horizontal space of the lower pedal area of the vehicle, and the effective driving section of the synchronous belt is path-constrained by means of the original lower hinge guide groove of the vehicle, so that the traction path of the synchronous belt is matched with the actual movement track of the lower hinge assembly.

Description

Technical Field

[0001] This application relates to the field of sliding door opening and closing device technology, and in particular to an electric drive structure for the lower part of a vehicle sliding door and a vehicle. Background Technology

[0002] Large vans typically refer to box-type vehicles, commercial vehicles, or multi-purpose vehicles with larger body dimensions and more spacious interiors for passengers and cargo. To facilitate rear passenger access and improve lateral passage after the doors are opened, these vehicles usually employ sliding doors for the rear seats. During opening and closing, the sliding door moves along the vehicle's longitudinal direction, and at the end of the closing process, it experiences a certain inward pressing displacement towards the vehicle body, ensuring a reliable fit between the door and the door frame, weatherstripping, and locking mechanism.

[0003] Existing electric drive methods for sliding doors mainly include middle-drive and bottom-drive types. Among these, in the bottom-drive type, such as... Figure 1 and Figure 2 As shown, the vehicle floor 11 typically extends outward from the side of the vehicle body to form a step area. This step area serves two purposes: firstly, it allows passengers to step on it when getting in and out of the vehicle; secondly, it houses the lower guide and drive-related structures of the sliding door. Generally, the step area includes a step upright 12 extending roughly along the vehicle's height direction and a step horizontal 13 located below the step upright 12. A lower hinge guide groove 131 is provided on the front side of the step horizontal 13. The lower hinge guide groove 131 accommodates one end of the lower hinge assembly of the sliding door and supports the movement of the lower hinge assembly. After the drive structure is connected to the lower hinge assembly, the sliding door can be opened and closed by driving the lower hinge assembly to move along the lower hinge guide groove.

[0004] Traditional sliding door lower electric drive structures typically employ an integrated drive assembly, such as the door opening and closing device disclosed in CN105873781B and the vehicle door opening and closing device disclosed in JP2006037502A. The general approach is to integrate the drive motor, transmission belt, drive wheel, guide wheel, tension wheel, and related connecting brackets onto a single integrated bracket, support plate, or track assembly, forming a modular drive assembly. This modular drive assembly is then installed as a whole in the vehicle's lower pedal area and connected to the sliding door's lower hinge assembly via brackets or connectors. This type of integrated structure offers advantages such as high assembly integration and ease of modular supply, enabling relatively stable application in traditional fuel-powered vehicles.

[0005] However, integrated drive assemblies typically need to be horizontally mounted on the vehicle floor or in the lower foot pedal area. Their integrated brackets, load-bearing plates, or rail assemblies occupy a considerable amount of continuous installation space along the sliding door's direction of movement. With the development of new energy vehicles, the area under the vehicle and near the lower foot pedal requires the placement of battery packs, high-voltage wiring harnesses, electronic control components, reinforcing beams, and bottom protective structures, significantly reducing the continuous horizontal installation space available for the lower drive mechanism of the sliding door in the lower foot pedal area. Traditional integrated drive assemblies, due to their large size, fixed mounting posture, and significant space occupation, are prone to interference with battery packs, high-voltage wiring harnesses, or vehicle body reinforcement structures, making them unsuitable for the bottom space layout requirements of new energy vehicles.

[0006] To reduce the space occupied by integrated drive assemblies, distributed sliding door drive structures have been proposed in the prior art. For example, CN222121284U discloses an automotive sliding door drive device that eliminates the traditional integrated form of a large-size integral injection-molded chassis, distributing the drive components and guide assemblies, and defining the running path of the synchronous belt through guide plates or guide blocks. Compared with integrated drive assemblies, this type of structure simplifies the integration of components and reduces the structural complexity of the overall bracket.

[0007] However, the aforementioned distributed structure is still primarily based on the horizontal mounting logic of the vehicle floor or lower pedal area. Its drive components, guide assemblies, timing belts, and guide plates still require a certain horizontal projection space under the vehicle or in the pedal area. In other words, although this type of structure breaks down the integral bracket into multiple independent components, the main operating path of the timing belt still relies on the horizontal arrangement space, making it difficult to fundamentally free up the continuous horizontal space in the lower pedal area of ​​new energy vehicles.

[0008] Furthermore, sliding doors do not simply move in a straight line along the vehicle's front-to-back direction. For electric sliding doors, the final stage of closing typically requires a combined displacement in both the vehicle's front-to-back and width directions. This means the lower hinge assembly's trajectory is not a simple horizontal straight line, but rather matches the trajectory of the lower hinge guide groove. Simply modifying the existing integral or distributed drive structure to a vertical or inclined installation can easily lead to a mismatch between the synchronous belt's traction direction, the guide wheel's reversing path, and the lower hinge assembly's actual movement trajectory, affecting the sliding door's normal opening, closing, and closing engagement.

[0009] Therefore, the existing electric drive structure of the lower part of the sliding door still has the following problems: On the one hand, it is difficult for both the traditional integrated drive assembly and the existing distributed drive structure to fully release the horizontal installation space of the lower pedal area; on the other hand, if its installation posture is directly changed, it is difficult to ensure that the running path of the synchronous belt matches the actual groove trajectory of the lower hinge guide groove, and it cannot reliably adapt to the compound motion at the end of the sliding door closing. Summary of the Invention

[0010] To address the aforementioned issues, this application provides an electric drive structure for the lower part of a vehicle sliding door and a vehicle.

[0011] The electric drive structure for the lower part of a vehicle sliding door provided in this application adopts the following technical solution: An electric drive structure for the lower part of a vehicle sliding door includes a timing belt, a front guide wheel assembly, a rear guide wheel assembly, a drive component, a tensioning component, and a lower hinge connector. The front guide wheel assembly and the rear guide wheel assembly are respectively located near the two ends of the lower hinge guide groove; The synchronous belt is wound around the front guide wheel group, the rear guide wheel group and the drive wheel group, forming a ring transmission path that extends along the height direction of the pedal upright plate; The synchronous belt includes a guide groove mating section, which is located within the lower hinge guide groove; The tensioning member is used to tension the timing belt so that the guide groove mating section is arranged along the groove trajectory of the lower hinge guide groove; The driving component is used to drive the drive wheel assembly, causing the timing belt to move along the annular transmission path; The lower hinge connector is connected to the guide groove mating section and the lower hinge.

[0012] By adopting the above technical solution, the front guide wheel assembly and the rear guide wheel assembly are respectively located near the two ends of the lower hinge guide groove. The synchronous belt is wound around the front guide wheel assembly, the rear guide wheel assembly, and the drive wheel assembly, forming a circular transmission path that unfolds along the height direction of the pedal upright. This allows the synchronous belt to no longer be laid horizontally on the vehicle floor or lower pedal area in the traditional way, but instead to be laid vertically or obliquely along the pedal upright. The guide groove mating section of the synchronous belt is located in the lower hinge guide groove and is arranged along the groove trajectory of the lower hinge guide groove under the tensioning action of the tensioning member. This allows the guide groove mating section to drive the movement of the lower hinge connector with the existing space and guide trajectory of the lower hinge guide groove, thereby matching the traction path of the synchronous belt with the movement trajectory of the lower hinge assembly. This avoids the problem of the traction direction being inconsistent with the actual movement trajectory of the sliding door due to the direct vertical arrangement of the synchronous belt.

[0013] The horizontal space occupied by the timing belt is converted into space occupied along the direction of the pedal upright plate, reducing the need for continuous horizontal installation space in the area of ​​the vehicle's lower pedal and making it easier to avoid the power battery pack, high-voltage wiring harness, electronic control components or reinforcement structure arranged at the bottom of the new energy vehicle.

[0014] Furthermore, the front guide wheel assembly, rear guide wheel assembly, drive wheel assembly, drive component, and tensioning component are installed as independent modules in different local locations within the lower pedal area, eliminating the need for a continuous, integral bracket or base assembly extending along the sliding door's direction of movement. This allows for adjustments to the installation orientation of each module based on the lower pedal structure, lower hinge guide groove shape, and vehicle body installation space of different models. Then, by selecting synchronous belts of different lengths and coordinating with the tensioning component for tension compensation, adaptation to different vehicle platforms can be achieved, improving the flexibility and versatility of the lower electric drive structure of the sliding door.

[0015] Optionally, a belt threading opening is provided on the arc-shaped end sidewall of the lower hinge guide groove. The synchronous belt passes through the belt threading opening, so that the synchronous belt passes out to the back area of ​​the pedal and then wraps around the front guide pulley group. The synchronous belt is redirected to the front area of ​​the pedal through the front guide pulley group. The synchronous belt also includes a return section, which is located near the top of the pedal upright.

[0016] By adopting the above technical solution, the belt threading opening is set on the arc-shaped end sidewall of the lower hinge guide groove, so that the synchronous belt can smoothly pass through the belt threading opening to the back area of ​​the pedal after extending along the groove trajectory of the lower hinge guide groove, and then be reversed to the front area of ​​the pedal through the front guide wheel set. This structure can make the guide groove mating section of the synchronous belt closer to the groove trajectory of the lower hinge guide groove, reduce the deflection and lateral force of the synchronous belt at the groove end, improve the accuracy of the synchronous belt's traction direction on the lower hinge assembly, and improve the smoothness of the synchronous belt's operation. Meanwhile, the return section of the synchronous belt is positioned near the top of the pedal upright, allowing the return section to be located below the top of the pedal upright or the area covered by the extended bottom plate. This reduces the risk of passengers stepping on or touching the synchronous belt when getting on and off the vehicle, and improves the concealment and safety of the synchronous belt installation.

[0017] Optionally, the drive wheel assembly includes a first frame, on which a drive wheel is rotatably connected. The first frame has a sliding hole, and an adjusting rod passes through the sliding hole. A pressure roller sleeve is rotatably fitted on the adjusting rod, and the adjusting rod is locked to the first frame by a clamping nut. The pressure roller sleeve is used to press the timing belt toward the drive wheel. The drive unit is mounted on the first frame.

[0018] By adopting the above technical solution, the drive wheel, adjusting rod, pressure roller sleeve, and drive components are all installed on the first frame, allowing the drive wheel assembly and drive components to form an independent drive module. This facilitates overall installation, positioning, and replacement within the vehicle's under-step area, improving assembly convenience. The adjusting rod passes through the sliding hole and can move along the sliding hole before being locked by the clamping nut, making the position of the pressure roller sleeve relative to the drive wheel adjustable. This allows for adjustment of the pressure roller sleeve's compression of the timing belt according to its installation status, ensuring the timing belt stably conforms to the outer circumference of the drive wheel. The pressure roller sleeve rotatably mounts on the adjusting rod, rotating with the timing belt while compressing it. This reduces frictional resistance between the timing belt and the pressure roller sleeve, lowering the risk of timing belt skipping, disengagement, or unstable engagement at the drive wheel, thereby improving transmission reliability during the sliding door's opening and closing process.

[0019] Optionally, the drive wheel assembly further includes a first guide wheel and a second guide wheel. There are two first guide wheels. Both the first guide wheels and the second guide wheel are rotatably connected to the first frame. The drive wheel is located between the two first guide wheels. The synchronous belt passes sequentially around one of the first guide wheels, the drive wheel, the other first guide wheel, and the second guide wheel to form a zigzag winding path between the two first guide wheels and the drive wheel. The second guide wheel is positioned near the top of the pedal upright, so that the synchronous belt extends to the rear guide wheel assembly in a direction close to the top of the pedal upright.

[0020] By adopting the above technical solution, the two first guide pulleys cooperate with the drive pulley to form a zigzag winding path for the synchronous belt at the drive pulley set. This increases the length of the synchronous belt wrapping around the drive pulley and the number of meshing teeth, reducing the risk of synchronous belt skipping, disengagement, or unstable meshing, and improving transmission stability. The second guide pulley is located near the top of the pedal upright plate, guiding the synchronous belt from the drive pulley set to the vicinity of the top of the pedal upright plate. This allows the return section of the synchronous belt to extend along the direction near the top of the pedal upright plate to the rear guide pulley set, facilitating the shielding and protection of the return section through the pedal top structure.

[0021] Optionally, the front guide wheel assembly includes a front bracket, in which a front upper guide wheel and a front lower guide wheel are rotatably connected. The rear guide wheel assembly includes a rear bracket, in which a rear lower guide wheel and a rear upper guide wheel are rotatably connected. The front bracket is positioned near the arc-shaped end of the lower hinge guide groove, and the rear bracket is positioned near the horizontal end of the lower hinge guide groove. The rear bracket is inclined toward the pedal upright, such that the front upper guide wheel and the rear upper guide wheel are both positioned near the top of the pedal upright, and the rear lower guide wheel and the front lower guide wheel are respectively positioned near one end of the lower hinge guide groove.

[0022] By adopting the above technical solution, a modular structure is formed by the front and rear brackets, facilitating independent installation based on the positions of both ends of the lower hinge guide groove. The front and rear lower guide wheels are positioned close to both ends of the lower hinge guide groove, limiting the belt travel position of the timing belt guide groove mating section at both ends of the lower hinge guide groove, allowing the guide groove mating section to be more stably arranged along the groove trajectory of the lower hinge guide groove. The front and rear upper guide wheels are both positioned close to the top of the pedal upright, guiding the return section of the timing belt to the vicinity of the top of the pedal upright, facilitating the concealment and protection of the return section. The rear bracket is inclined towards the pedal upright, allowing the rear lower and rear upper guide wheels to simultaneously adapt to the spatial positions of both the horizontal end of the lower hinge guide groove and the top of the pedal upright.

[0023] Optionally, the tensioning component includes two tensioning frames, which are respectively mounted on the front support and the rear support. Each tensioning frame has a waist-shaped hole through which a movable rod passes. A tensioning wheel is fitted on the movable rod, and the movable rod is fixed to the tensioning frame by a tightening nut.

[0024] By adopting the above technical solution, two tensioning frames are respectively installed on the front and rear supports, allowing the tensioning components to form modular tensioning guide structures with the front and rear guide pulley groups, facilitating overall assembly and independent adjustment. The synchronous belt can sequentially wind around the upper front guide pulley, the corresponding tensioning pulley, and the lower front guide pulley at the front support, and sequentially wind around the upper rear guide pulley, the corresponding tensioning pulley, and the lower rear guide pulley at the rear support, thus forming a zigzag winding path at the front and rear guide pulley groups respectively. The moving rod can move along the oblong hole and be locked by the locking nut after adjustment, making the position of the tensioning pulley relative to the corresponding upper and lower guide pulleys adjustable. This allows for adjustment of the tension state of the synchronous belt on the front and rear support sides respectively.

[0025] Optionally, the tensioning member further includes a movable frame, the movable rod is rotatably mounted on the movable frame, the tensioning wheel is located inside the movable frame, the movable frame is connected to a pull rod, the pull rod passes through the tensioning frame, and a limiting nut is threaded to one end of the pull rod that extends out of the tensioning frame. The pull rod is used to push the movable rod to move along the extension direction of the waist-shaped hole.

[0026] By adopting the above technical solution, during adjustment, pulling the pull rod or rotating the limit nut moves the moving frame, moving rod, and tensioning wheel along the extension direction of the oblong hole, thereby changing the position of the tensioning wheel relative to the synchronous belt and adjusting the tension of the synchronous belt. The limit nut is threadedly connected to the pull rod and abuts against the tensioning frame, restricting and maintaining the position of the tensioning wheel after adjustment, preventing the tensioning wheel from retracting under the tension of the synchronous belt. Therefore, the operator only needs to adjust the position of the limit nut to complete the tension adjustment of the tensioning wheel, making the adjustment method simple.

[0027] Optionally, the lower hinge connector includes a hinge plate hinged to the lower hinge. The hinge plate is rotatably connected to a support wheel, which is supported in the guide groove of the lower hinge. A clamping plate is bolted to the bottom of the hinge plate. The timing belt passes through one side of the hinge plate and the clamping plate, then wraps around the shaft of the support wheel, and exits through the other side of the hinge plate and the clamping plate. The clamping plate and the hinge plate together clamp the timing belt.

[0028] By adopting the above technical solution, the hinge plate is hinged to the lower hinge, allowing the synchronous belt to drive the lower hinge along the lower hinge guide groove via the lower hinge connector. The support wheel is supported in the lower hinge guide groove, providing rolling support to the hinge plate, reducing the frictional resistance of the lower hinge connector when moving within the lower hinge guide groove, and improving the smoothness of the sliding door's opening and closing process. The synchronous belt enters from one side of the hinge plate and clamping plate, passes around the pivot of the support wheel, and then exits from the other side, where it is clamped by both the clamping plate and the hinge plate. This creates a folding clamping fixation of the synchronous belt at the lower hinge connector, increasing the contact between the synchronous belt and the lower hinge connector, reducing the risk of the synchronous belt slipping off relative to the lower hinge connector, and improving the connection reliability when the synchronous belt pulls the lower hinge.

[0029] Optionally, it also includes a guide rail, which is installed in the lower hinge guide groove, and a guide wheel is rotatably connected to the hinge plate, the guide wheel being rolled within the guide rail.

[0030] By adopting the above technical solution, the guide rail is installed in the lower hinge guide groove, and the guide wheel is rolled in the guide rail, so that the hinge plate can be limited and guided by the guide rail when it moves with the timing belt, thereby improving the trajectory stability of the lower hinge connector along the lower hinge guide groove.

[0031] This application also provides a vehicle employing the following technical solution: A vehicle that utilizes the aforementioned electric drive structure for the lower part of a sliding door.

[0032] In summary, this application includes at least one of the following beneficial technical effects: 1. The synchronous belt forms a circular transmission path along the height direction of the pedal upright, and the return section of the synchronous belt is set close to the top of the pedal upright. The tensioning member sets the guide groove matching section along the groove trajectory of the lower hinge guide groove. This can reduce the occupation of the synchronous belt on the continuous horizontal space of the vehicle's lower pedal area. Furthermore, the original lower hinge guide groove of the vehicle is used to constrain the path of the effective drive section of the synchronous belt, so that the traction path of the synchronous belt matches the actual movement trajectory of the lower hinge assembly. This ensures that the sliding door can stably complete the opening, closing, and pressing action of the final closing stage. 2. The front guide wheel assembly, rear guide wheel assembly, drive wheel assembly, and tensioning component can be installed as independent modules in different local positions of the lower pedal area. By selecting the length of the synchronous belt and adjusting the tensioning component, the lower pedal structure and lower hinge guide groove shape can be adapted to different vehicle models, thereby improving the layout flexibility and platform versatility of the electric drive structure of the lower part of the vehicle sliding door. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram illustrating the automobile floor, pedal upright plate, and pedal horizontal plate according to an embodiment of this application.

[0034] Figure 2 This is a schematic diagram illustrating the structure of the lower hinge guide groove in an embodiment of this application.

[0035] Figure 3 This is a schematic diagram of the overall structure of an embodiment of this application.

[0036] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle.

[0037] Figure 5 This is a schematic diagram illustrating the structure of the guide wheel assembly and tensioner in an embodiment of this application.

[0038] Figure 6 This is a schematic diagram illustrating the structure of the drive wheel assembly in an embodiment of this application.

[0039] Figure 7 This is a schematic diagram illustrating the structure of the driving component in an embodiment of this application.

[0040] Figure 8 yes Figure 3 Enlarged diagram of part B.

[0041] Figure 9 This is a schematic diagram illustrating the structure of the rear guide wheel assembly in an embodiment of this application.

[0042] Figure 10 This is a schematic diagram illustrating the structure of the synchronization belt in an embodiment of this application.

[0043] Figure 11 This is a schematic diagram illustrating the structure of the synchronous belt winding around the back of the pedal horizontal plate according to an embodiment of this application.

[0044] Figure 12 yes Figure 11 An enlarged schematic diagram of section C.

[0045] Figure 13 This is a schematic diagram illustrating the structure of the lower hinge connector in an embodiment of this application.

[0046] Explanation of reference numerals in the attached drawings: 11. Car floor; 12. Pedal upright plate; 13. Pedal horizontal plate; 131. Lower hinge guide groove; 132. Belt threading opening; 2. Synchronous belt; 21. Guide groove mating section; 22. Return section; 3. Front guide wheel assembly; 31. Front bracket; 32. Front upper guide wheel; 33. Front lower guide wheel; 4. Rear guide wheel assembly; 41. Rear bracket; 42. Rear upper guide wheel; 43. Rear lower guide wheel; 5. Drive wheel assembly; 51. First frame; 511. Positioning hole; 512. Sliding hole; 52. Main... 53. Drive wheel; 54. First guide wheel; 55. Second guide wheel; 56. Adjusting rod; 57. Pressure roller sleeve; 6. Pressure nut; 78. Drive component; 61. Motor; 62. Reducer; 73. Tensioning component; 74. Tensioning frame; 75. Waist-shaped hole; 76. Moving frame; 77. Moving rod; 78. Tensioning wheel; 79. Clamping nut; 70. Pull rod; 71. Limiting nut; 82. Lower hinge connector; 83. Hinge plate; 84. Support wheel; 85. Clamping plate; 86. Guide rail; 87. Guide wheel. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 1-13 This application will be described in further detail.

[0048] This application discloses an electric drive structure for the lower part of a vehicle sliding door.

[0049] The electric drive structure for the lower part of a vehicle sliding door disclosed in this application is used for installation on, for example... Figure 1 and Figure 2 The vehicle structure shown includes a vehicle floor 11, with a pedal component connected to the bottom of the floor 11. The pedal component has a roughly L-shaped cross-section. The pedal component includes a pedal upright plate 12 and a pedal horizontal plate 13. The pedal upright plate 12 is connected to the bottom of the vehicle floor 11, and the pedal horizontal plate 13 is connected to the bottom of the pedal upright plate 12 and extends towards the outside of the vehicle.

[0050] A groove is formed on the side of the vehicle floor plate 11 near the pedal component, and the groove is located above the middle area of ​​the pedal component. The side of the vehicle floor plate 11 near the pedal component cantilevered out, so that the projection of the vehicle floor plate 11 in the vehicle height direction can cover the two ends of the pedal upright plate 12 and the pedal horizontal plate 13, thereby providing shielding and protection for the structure installed near the pedal component.

[0051] A lower hinge guide groove 131 is provided on the side of the pedal horizontal plate 13 away from the vehicle floor 11. The lower hinge guide groove 131 is used to accommodate and guide one end of the lower hinge of the sliding door. The lower hinge guide groove 131 is generally arc-shaped. Specifically, the part of the lower hinge guide groove 131 near the front of the vehicle is an arc-shaped section, which extends towards the inside of the vehicle and tilts forward. The middle part and the part near the rear of the vehicle are straight sections, extending along the front-rear direction of the vehicle. The lower hinge has an L-shaped structure, and the horizontal end of the lower hinge extends into the lower hinge guide groove 131 and can move along the lower hinge guide groove 131.

[0052] like Figure 3 and Figure 4 The lower electric drive structure of the vehicle sliding door includes a synchronous belt 2, a front guide wheel group 3, a rear guide wheel group 4, a drive wheel group 5, a drive component 6, a tensioning component 7, and a lower hinge connector 8.

[0053] like Figure 4 and Figure 5 The front guide wheel assembly 3 is located near the end of the arc-shaped section of the lower hinge guide groove 131. The front guide wheel assembly 3 includes a front bracket 31, which is vertically fixed to the plate on the front side of the vehicle by bolts. The front upper guide wheel 32 and the front lower guide wheel 33 are rotatably connected inside the front bracket 31. The front upper guide wheel 32 is located near the top of the pedal upright plate 12, and the front lower guide wheel 33 is located near the end of the arc-shaped section of the lower hinge guide groove 131.

[0054] like Figure 6 and Figure 7 The drive wheel assembly 5 includes a first frame 51, which is an L-shaped plate. The first frame 51 is bolted to the end of the pedal horizontal plate 13 near the front of the vehicle. The first frame 51 is located within the cantilevered shielding area of ​​the vehicle floor 11, allowing the vehicle floor 11 to shield and protect the first frame 51 and the components mounted on it. The first frame 51 also has positioning holes 511, which are used to engage with positioning protrusions on the pedal horizontal plate 13 to facilitate quick positioning of the first frame 51 during installation.

[0055] The first frame 51 is rotatably connected to a drive wheel 52, two first guide wheels 53, and a second guide wheel 54 on the side facing the pedal upright 12. The drive wheel 52 is located between the two first guide wheels 53, and the radius of the drive wheel 52 is larger than the radius of the first guide wheels 53. In this embodiment, the radius of the drive wheel 52 is 2-4 times the radius of the first guide wheels 53. The two first guide wheels 53 are located on both sides of the drive wheel 52 along the running direction of the synchronous belt 2, with the first guide wheel 53 closer to the front of the vehicle being positioned higher than the other first guide wheel 53. Both first guide wheels 53 and the drive wheel 52 are positioned close to the pedal horizontal plate 13. The second guide wheel 54 is mounted on the top of the first frame 51 and positioned close to the top of the pedal upright 12. The second guide wheel 54 is positioned closer to the outer side of the pedal component than the first guide wheels 53, so as to guide the synchronous belt 2 to a position close to the top of the pedal upright 12.

[0056] The first frame 51 is also provided with a sliding hole 512, which extends along the vehicle height direction. An adjusting rod 55 passes through the sliding hole 512; in this embodiment, the adjusting rod 55 is a bolt. A pressure roller sleeve 56 is coaxially sleeved on the adjusting rod 55, and two clamping nuts 57 are threaded onto the adjusting rod 55. The two clamping nuts 57, together with a washer, clamp the first frame 51, so that the adjusting rod 55 can be fixed to the first frame 51 after being adjusted to a preset height position. The pressure roller sleeve 56 is used to press the synchronous belt 2 against the drive pulley 52 to improve the meshing stability between the synchronous belt 2 and the drive pulley 52.

[0057] The drive component 6 is mounted on the first frame 51 and is connected to the drive wheel 52 via a transmission connection. The drive component 6 is used to drive the drive wheel 52 to rotate, thereby driving the synchronous belt 2 to move along a preset annular transmission path. In this embodiment, the drive component 6 includes a motor 61 and a reducer 62. The reducer 62 is connected to the drive wheel 52 and fixed on the first frame 51, and the motor 61 is connected to the reducer 62.

[0058] like Figure 8 and Figure 9 The rear guide wheel assembly 4 includes a rear bracket 41, which is bolted to the side panel of the pedal assembly near the rear of the vehicle. The rear bracket 41 is inclined; specifically, the top of the rear bracket 41 is inclined towards the direction close to the pedal upright 12, and the bottom of the rear bracket 41 extends into the rear end of the lower hinge guide groove 131. The rear bracket 41 is located within the overhanging shielding range of the vehicle floor 11, allowing the vehicle floor 11 to shield and protect the rear bracket 41 and the components mounted on it.

[0059] The top of the rear bracket 41 is rotatably connected to the upper rear guide wheel 42, and the bottom of the rear bracket 41 is rotatably connected to the lower rear guide wheel 43. Due to the inclined setting of the rear bracket 41, the lower rear guide wheel 43 can be located at or near the end of the lower hinge guide groove 131 near the rear of the vehicle, while the upper rear guide wheel 42 can be located near the top of the pedal upright plate 12, so that the rear guide wheel assembly 4 can simultaneously adapt to the lower guide groove mating path and the upper return path of the synchronous belt 2.

[0060] like Figure 5 and Figure 9 The tensioning component 7 includes two tensioning frames 71, each with a U-shaped structure. One tensioning frame 71 is mounted on the front support 31, and the other tensioning frame 71 is mounted on the rear support 41. A movable frame 72 is slidably disposed within the tensioning frame 71. Both the front support 31 and the rear support 41 have sliding grooves, allowing the movable frame 72 to slide along the corresponding sliding grooves in the direction of extending into the front support 31 or the rear support 41.

[0061] Both sides of the tensioning frame 71 have oblong holes 711 extending along the length of the sidewall of the tensioning frame 71. A movable rod 73 passes through the movable frame 72, and a tensioning wheel 74 is coaxially sleeved on the movable rod 73. In this embodiment, the movable rod 73 is a bolt, with both ends of the movable rod 73 passing through the oblong holes 711 on both sides of the tensioning frame 71, and a locking nut 75 threaded to one end of the movable rod 73. By cooperating with the locking nut 75 and the movable rod 73 to clamp the tensioning frame 71, the movable frame 72 can be fixed relative to the tensioning frame 71 after the tensioning wheel 74 is adjusted to the correct position.

[0062] Furthermore, to facilitate adjustment of the movable frame 72, a pull rod 76 is provided through the tensioning frame 71, and the pull rod 76 is fixedly connected to the movable frame 72. A limit nut 77 is threaded onto the pull rod 76. When the operator pulls the pull rod 76 to tighten the timing belt 2 with the tensioning wheel 74, the limit nut 77 is adjusted to abut against the tensioning frame 71, thereby restricting the movement of the movable frame 72 along the extension direction of the oblong hole 711, thus fixing the position of the tensioning wheel 74. This allows for adjustment of the tension of the timing belt 2 on the front support 31 side and the rear support 41 side, respectively.

[0063] The synchronous belt 2 is a toothed synchronous belt 2. The front upper guide pulley 32, the front lower guide pulley 33, the rear upper guide pulley 42, the rear lower guide pulley 43, the drive pulley 52, the first guide pulley 53, the second guide pulley 54, and the tension pulley 74 are all synchronous pulleys that mesh with the toothed synchronous belt 2.

[0064] like Figure 10 , Figure 11 and Figure 12The pedal horizontal plate 13 has a belt threading opening 132, which is located at the end of the arc-shaped section of the lower hinge guide groove 131. The pedal component also has a belt threading opening 132 on the side plate near the front of the vehicle, so that the synchronous belt 2 can pass between the lower hinge guide groove 131, the side of the pedal component, and the front guide wheel assembly 3.

[0065] The specific winding method of the synchronous belt 2 is as follows: Starting from the lower guide wheel 43, the synchronous belt 2 first passes around the lower guide wheel 43, then extends along the lower hinge guide groove 131, and passes through the belt insertion opening 132 at the end of the arc-shaped section of the lower hinge guide groove 131; then, the synchronous belt 2 passes around the front lower guide wheel 33, the tension wheel 74 located on the front bracket 31 and the front upper guide wheel 32 in sequence, and then passes around one of the first guide wheels 53, the drive wheel 52 and the other first guide wheel 53 in sequence, so that the synchronous belt 2 forms a zigzag winding path between the two first guide wheels 53 and the drive wheel 52; then, the synchronous belt 2 winds around to the second guide wheel 54, and is guided by the second guide wheel 54 to a position near the top of the pedal upright plate 12; after that, the synchronous belt 2 winds around the rear upper guide wheel 42, the tension wheel 74 located on the rear bracket 41 in sequence, and finally winds back to the rear lower guide wheel 43 to form a closed loop transmission path.

[0066] In the aforementioned winding configuration, the synchronous belt 2 includes a guide groove mating section 21 and a return section 22. The guide groove mating section 21 is located within the lower hinge guide groove 131 and extends along the groove trajectory of the lower hinge guide groove 131; the return section 22 is located above the lower hinge guide groove 131 and is positioned near the top of the pedal upright plate 12. By adjusting the positions of the two tensioning rollers 74, the synchronous belt 2 can be tensioned on the side near the front of the vehicle and the side near the rear of the vehicle, respectively, so that the synchronous belt 2 forms a zigzag tensioning path at both the front support 31 and the rear support 41. In the tensioned state, the guide groove mating section 21 can be positioned against or adjacent to the side wall of the lower hinge guide groove 131, and the return section 22 can be positioned against or adjacent to the top of the pedal upright plate 12.

[0067] The lower hinge connector 8 is fixed to the guide groove mating section 21 of the synchronous belt 2 and connected to the lower hinge. When the driving member 6 drives the drive wheel 52 to rotate, the drive wheel 52 drives the synchronous belt 2 to move along the annular transmission path. The guide groove mating section 21 of the synchronous belt 2 drives the lower hinge to move along the lower hinge guide groove 131 through the lower hinge connector 8, thereby realizing the opening and closing of the sliding door.

[0068] Therefore, by arranging the guide groove section 21 of the synchronous belt 2 within the lower hinge guide groove 131, the original lower hinge guide groove 131 of the vehicle can be used as the path reference for the effective drive section of the synchronous belt 2, so that the traction direction of the synchronous belt 2 matches the actual movement trajectory of the lower hinge; by setting the return section 22 of the synchronous belt 2 against the top of the pedal upright plate 12, it can be shielded by the overhanging part of the vehicle floor 11 or the top structure of the pedal, reducing the risk of passengers stepping on or contacting the synchronous belt 2 when getting on and off the vehicle; by making the synchronous belt 2 form an upper and lower layered annular transmission path along the height direction of the pedal upright plate 12, the synchronous belt 2 and its guide components can be prevented from occupying the continuous installation space at the bottom of the vehicle in a horizontal laying manner, thereby facilitating the avoidance of the power battery pack, high-voltage wiring harness, reinforcing beam and other bottom structures at the bottom of the new energy vehicle.

[0069] Meanwhile, the front guide wheel assembly 3, the rear guide wheel assembly 4, the drive wheel assembly 5, and the tensioning component 7 each form an independent module, which can adjust the installation position according to the size of the pedal parts of different vehicle models, the shape of the lower hinge guide groove 131, and the local installation space of the vehicle body. When adapting to different vehicle models, the tension of the synchronous belt 2 can be adjusted by replacing it with a synchronous belt of different lengths and cooperating with the tensioning component 7 to ensure that the guide groove mating section 21 is stably arranged along the lower hinge guide groove 131, thereby improving the spatial adaptability and platform versatility of the electric drive structure of the lower part of the vehicle sliding door.

[0070] like Figure 12 The lower hinge connector 8 includes a hinge plate 81, one end of which is hinged to the lower hinge, allowing the lower hinge connector 8 to adapt to changes in the swing angle of the lower hinge while moving with the timing belt 2. A support wheel 82 is rotatably connected to the hinge plate 81, and the support wheel 82 is supported within the lower hinge guide groove 131 and can roll along the lower hinge guide groove 131, thereby supporting the hinge plate 81 and reducing the frictional resistance when the lower hinge connector 8 moves along the lower hinge guide groove 131.

[0071] A clamping plate 83 is bolted to the bottom of the hinge plate 81, forming a clamping space between the clamping plate 83 and the hinge plate 81 for clamping the synchronous belt 2. The synchronous belt 2 passes through one side between the hinge plate 81 and the clamping plate 83, then around the pivot of the support wheel 82, and then exits through the other side between the hinge plate 81 and the clamping plate 83. After tightening the bolts connecting the hinge plate 81 and the clamping plate 83, the clamping plate 83 and the hinge plate 81 together clamp the synchronous belt 2, fixing the lower hinge connector 8 onto the guide groove mating section 21 of the synchronous belt 2.

[0072] Through the above structure, the synchronous belt 2 is not only clamped by the hinge plate 81 and the clamping plate 83, but also forms a return limiting path around the pivot of the support wheel 82. Therefore, it can improve the connection reliability between the synchronous belt 2 and the lower hinge connector 8, and reduce the risk of the synchronous belt 2 slipping or dislodging relative to the lower hinge connector 8 during the movement of the lower hinge under traction. When the drive unit 6 drives the synchronous belt 2 to move, the synchronous belt 2 drives the lower hinge to move along the lower hinge guide groove 131 through the clamped and fixed lower hinge connector 8, thereby realizing the opening and closing of the sliding door.

[0073] like Figure 12 The lower electric drive structure of the vehicle sliding door also includes a guide rail 84, which is installed in the lower hinge guide groove 131 and extends along the groove trajectory of the lower hinge guide groove 131. A guide wheel 85 is rotatably connected to the hinge plate 81, and the guide wheel 85 is rolled within the guide rail 84. After the guide wheel 85 cooperates with the guide rail 84, it can limit the movement direction of the hinge plate 81, so that the hinge plate 81 moves stably along the lower hinge guide groove 131 under the traction of the synchronous belt 2, reducing the possibility of the hinge plate 81 swaying, shaking or jamming during movement.

[0074] It should be noted that the phrase "the guide groove mating section 21 is arranged along the groove trajectory of the lower hinge guide groove 131" in this application does not limit the guide groove mating section 21 to being in contact with the side wall of the lower hinge guide groove 131 throughout its entire length. As one embodiment, the guide groove mating section 21 can be disposed in contact with or adjacent to the side wall of the lower hinge guide groove 131 along its length, with the lower hinge connector 8 connected to the side of the guide groove mating section 21 facing away from the side wall of the lower hinge guide groove 131. In this case, the lower hinge connector 8 may include a connecting plate, which is attached to the side of the guide groove mating section 21 facing away from the side wall of the lower hinge guide groove 131. A connecting hole may be provided on the guide groove mating section 21, and a bolt passes through the connecting plate and the guide groove mating section 21 to fix the connecting plate to the guide groove mating section 21. In this way, the guide groove mating section 21 can directly use the side wall of the lower hinge guide groove 131 to limit the path, so that the synchronous belt 2 can run along the groove trajectory of the lower hinge guide groove 131 when the hinge moves under traction, thereby ensuring the running stability of the synchronous belt 2 without setting an additional guide rail 84.

[0075] As another implementation, as shown in the embodiments of this application, the local area where the guide groove mating section 21 connects with the lower hinge connector 8 can be spaced apart from the side wall of the lower hinge guide groove 131, so that the hinge plate 81, clamping plate 83, and support wheel 82 can be connected to the synchronous belt 2. When the guide groove mating section 21 extends from the position close to the lower hinge connector 8 to the direction away from the lower hinge connector 8, it can gradually approach the side wall of the lower hinge guide groove 131, and be set close to or adjacent to the side wall of the lower hinge guide groove 131 in the area away from the lower hinge connector 8. This method also enables the guide groove mating section 21 to be arranged along the groove trajectory of the lower hinge guide groove 131 as a whole, and meets the basic requirement of the synchronous belt 2 pulling the lower hinge to move along the lower hinge guide groove 131. To further prevent the lower hinge connector 8 from swaying, shaking, or deviating from the predetermined running path during movement, a guide rail 84 can be provided in the lower hinge guide groove 131, and a guide wheel 85 that cooperates with the guide rail 84 can be provided on the hinge plate 81. The movement trajectory of the lower hinge connector 8 can be limited by the guide rail 84 and the guide wheel 85, thereby improving the stability of the lower hinge movement when the synchronous belt 2 pulls it.

[0076] For ease of understanding, the phrase "synchronous belt 2 is wound around the front guide wheel set 3, the rear guide wheel set 4, and the drive wheel set 5, forming a ring-shaped transmission path extending along the height direction of the pedal upright plate 12" in this application does not limit the synchronous belt 2 to be completely vertical, nor does it limit the synchronous belt 2 to passing through the pedal component or wrapping around to the back of the pedal component. As long as the guide groove mating section 21 of the synchronous belt 2 is located within the lower hinge guide groove 131 or arranged along the groove trajectory of the lower hinge guide groove 131, and the synchronous belt 2 as a whole can be arranged around the pedal upright plate 12, it can be understood that the synchronous belt 2 forms a ring-shaped transmission path extending along the height direction of the pedal upright plate 12.

[0077] The front guide wheel assembly 3 and the rear guide wheel assembly 4 are respectively positioned near both ends of the lower hinge guide groove 131 to define the reversing and guiding positions of the synchronous belt 2 at both ends of the lower hinge guide groove 131. The front guide wheel assembly 3 and the rear guide wheel assembly 4 can be mounted on the pedal component, body side panel, or adjacent body panel via independent brackets, or the guide wheels can be directly rotatably mounted on the pedal component or body panel. In other words, the front guide wheel assembly 3 and the rear guide wheel assembly 4 do not necessarily need to be equipped with independent brackets, as long as they can guide the synchronous belt 2 near both ends of the lower hinge guide groove 131, so that the guide groove mating section 21 of the synchronous belt 2 is arranged along the groove trajectory of the lower hinge guide groove 131.

[0078] The front guide pulley group 3 and the rear guide pulley group 4 in this application may each include one or more guide pulleys. When the synchronous belt 2 only needs to complete a single reversal at the corresponding end, the front guide pulley group 3 or the rear guide pulley group 4 may include only one guide pulley; when the synchronous belt 2 needs to complete a height direction reversal, reversal tensioning, or avoidance of the vehicle body structure at the corresponding end, the front guide pulley group 3 or the rear guide pulley group 4 may include an upper guide pulley, a lower guide pulley, and a tensioning pulley 74 disposed between the two. The guide pulley can be a synchronous pulley that meshes with the synchronous belt 2, or it can be set as a smooth guide pulley, a guide pulley with a flange, or a guide pulley with a guide groove, depending on the actual force and guiding requirements.

[0079] In some embodiments, the synchronous belt 2 can pass through the threaded opening 132 at the end of the lower hinge guide groove 131, and then wrap around to the back or side of the pedal component. It then forms a closed transmission path through the front guide wheel group 3, the rear guide wheel group 4, and the drive wheel group 5. That is, the return section 22 can be completely flush with the back of the pedal component. In this case, the return section 22 can be shielded and protected by the back or side structure of the pedal component, thereby reducing the risk of the passenger stepping on or contacting the synchronous belt 2. In other embodiments, the synchronous belt 2 may not pass through the pedal component, but instead form a closed transmission path on the same side of the pedal component along the lower hinge guide groove 131, the top of the pedal upright 12, and the corresponding guide wheel group. In this case, as long as the guide wheel in the front guide wheel group 3 near the end of the lower hinge guide groove 131 can limit the end position of the synchronous belt 2 guide groove mating section 21, and the tensioning member 7 can apply tension to the synchronous belt 2, the guide groove mating section 21 can be arranged along the groove trajectory of the lower hinge guide groove 131.

[0080] The installation position of the drive wheel assembly 5 is not limited to the end of the pedal horizontal plate 13 near the front of the vehicle. The drive wheel assembly 5 can be installed on the pedal horizontal plate 13, pedal vertical plate 12, pedal side plate, the back of the vehicle floor, vehicle side panel, or other adjacent fixed parts of the vehicle body. As long as the drive component 6 can drive the synchronous belt 2 to move along the annular transmission path through the drive wheel assembly 5, it is an optional embodiment of this application. The drive wheel assembly 5 may include a drive pulley 52, and may further include a pressure pulley, a guide pulley 85, a reversing pulley, or a tension pulley 74 to increase the engagement wrap angle between the synchronous belt 2 and the drive pulley 52, or to guide the synchronous belt 2 to a position near the top of the pedal vertical plate 12.

[0081] The tensioning element 7 is not limited to the aforementioned tensioning frame 71 structure mounted on the front bracket 31 and the rear bracket 41. The tensioning element 7 can be a tensioner independently mounted on the side plate of the pedal component, the pedal upright plate 12, the vehicle floor plate, or the vehicle side panel, such as a slider tensioner, a screw tensioner, an eccentric wheel tensioner, a spring tensioner, a torsion spring swing arm tensioner, or a tensioning structure consisting of an adjusting bolt and a tensioning wheel 74. The tensioning element 7 can be located at the front guide wheel assembly 3, the rear guide wheel assembly 4, the drive wheel assembly 5, or at a location adjacent to the return section 22 of the synchronous belt 2 or the guide groove mating section 21 of the pedal component. As long as the tensioning element 7 can apply tension to the synchronous belt 2, ensuring that the guide groove mating section 21 remains arranged along the groove trajectory of the lower hinge guide groove 131, the basic technical objective of this application can be achieved.

[0082] The implementation principle of this application embodiment is as follows: the front guide wheel group 3 and the rear guide wheel group 4 are respectively set near the two ends of the lower hinge guide groove 131. The synchronous belt 2 is wound around the front guide wheel group 3, the rear guide wheel group 4 and the drive wheel group 5, which can form a ring transmission path that unfolds along the height direction of the pedal upright plate 12. This means that the synchronous belt 2 is no longer laid horizontally on the vehicle floor or the lower pedal area in the traditional way, but is instead wound vertically or obliquely along the pedal upright plate 12. The guide groove mating section 21 in the synchronous belt 2 is located in the lower hinge guide groove 131 and is arranged along the groove trajectory of the lower hinge guide groove 131 under the tensioning action of the tensioning member 7. This allows the guide groove mating section 21 to drive the lower hinge connector 8 to move by using the existing space and guide trajectory of the lower hinge guide groove 131. This makes the traction path of the synchronous belt 2 match the movement trajectory of the lower hinge assembly, avoiding the problem of the traction direction being inconsistent with the actual movement trajectory of the sliding door due to the direct vertical arrangement of the synchronous belt 2. Furthermore, the horizontal space occupied by the synchronous belt 2 is converted into space occupied along the direction of the pedal upright plate 12, reducing the need for continuous horizontal installation space in the area of ​​the vehicle's lower pedal, and making it easier to avoid the power battery pack, high-voltage wiring harness, electronic control components or reinforcement structure arranged at the bottom of the new energy vehicle.

[0083] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric drive structure for the lower part of a vehicle sliding door, characterized in that: It includes a timing belt (2), a front guide pulley group (3), a rear guide pulley group (4), a drive wheel group (5), a drive component (6), a tensioning component (7), and a lower hinge connector (8); The front guide wheel assembly (3) and the rear guide wheel assembly (4) are respectively located near the two ends of the lower hinge guide groove (131); The synchronous belt (2) is wound around the front guide wheel group (3), the rear guide wheel group (4) and the drive wheel group (5), forming a ring transmission path that extends along the height direction of the pedal upright plate (12); The synchronous belt (2) includes a guide groove mating section (21), which is located in the lower hinge guide groove (131); The tensioning member (7) is used to tension the synchronous belt (2), so that the guide groove mating section (21) is arranged along the groove trajectory of the lower hinge guide groove (131); The driving component (6) is used to drive the drive wheel assembly (5) so that the synchronous belt (2) moves along the annular transmission path; The lower hinge connector (8) is connected to the guide groove mating section (21) and the lower hinge.

2. The electric drive structure for the lower part of the vehicle sliding door according to claim 1, characterized in that: A belt threading opening (132) is provided on the arc-shaped end sidewall of the lower hinge guide groove (131). The synchronous belt (2) passes through the belt threading opening (132) and extends to the back area of ​​the pedal before being wrapped around the front guide wheel assembly (3). The synchronous belt (2) is then redirected to the front area of ​​the pedal through the front guide wheel assembly (3). The synchronous belt (2) also includes a return section (22) which is located near the top of the pedal stand (12).

3. The electric drive structure for the lower part of the vehicle sliding door according to claim 1, characterized in that: The drive wheel assembly (5) includes a first frame (51), on which a drive wheel (52) is rotatably connected. A sliding hole (512) is provided on the first frame (51), and an adjusting rod (55) passes through the sliding hole (512). A pressure roller sleeve (56) is rotatably sleeved on the adjusting rod (55), and the adjusting rod (55) is locked to the first frame (51) by a clamping nut (57). The pressure roller sleeve (56) is used to press the synchronous belt (2) toward the drive wheel (52). The drive unit (6) is mounted on the first frame (51).

4. The electric drive structure for the lower part of the vehicle sliding door according to claim 3, characterized in that: The drive wheel assembly (5) further includes a first guide wheel (53) and a second guide wheel (54). There are two first guide wheels (53). Both the first guide wheel (53) and the second guide wheel (54) are rotatably connected to the first frame (51). The drive wheel (52) is located between the two first guide wheels (53). The synchronous belt (2) passes sequentially around one of the first guide wheels (53), the drive wheel (52), the other first guide wheel (53), and the second guide wheel (54) to form a zigzag winding path between the two first guide wheels (53) and the drive wheel (52). The second guide wheel (54) is positioned near the top of the pedal stand (12), so that the synchronous belt (2) extends to the rear guide wheel assembly (4) in a direction near the top of the pedal stand (12).

5. The electric drive structure for the lower part of the vehicle sliding door according to claim 1, characterized in that: The front guide wheel assembly (3) includes a front bracket (31), in which a front upper guide wheel (32) and a front lower guide wheel (33) are rotatably connected. The rear guide wheel assembly (4) includes a rear bracket (41), in which a rear lower guide wheel (43) and a rear upper guide wheel (42) are rotatably connected. The front bracket (31) is located near the arc-shaped end of the lower hinge guide groove (131), and the rear bracket (41) is located near the horizontal end of the lower hinge guide groove (131). The rear bracket (41) is inclined toward the pedal upright plate (12), so that the front upper guide wheel (32) and the rear upper guide wheel (42) are both located near the top of the pedal upright plate (12), and the rear lower guide wheel (43) and the front lower guide wheel (33) are respectively located near one end of the lower hinge guide groove (131).

6. The electric drive structure for the lower part of the vehicle sliding door according to claim 5, characterized in that: The tensioning member (7) includes two tensioning frames (71), which are respectively installed on the front bracket (31) and the rear bracket (41). The tensioning frame (71) has a waist-shaped hole (711) through which a moving rod (73) passes. A tensioning wheel (74) is sleeved on the moving rod (73), and the moving rod (73) is fixed on the tensioning frame (71) by a tightening nut (75).

7. The electric drive structure for the lower part of the vehicle sliding door according to claim 6, characterized in that: The tensioning member (7) also includes a movable frame (72), the movable rod (73) is rotatably mounted on the movable frame (72), the tensioning wheel (74) is located inside the movable frame (72), the movable frame (72) is connected to a pull rod (76), the pull rod (76) passes through the tensioning frame (71), and one end of the pull rod (76) that protrudes from the tensioning frame (71) is threadedly connected to a limiting nut (77). The pull rod (76) is used to drive the movable rod (73) to move along the extension direction of the waist-shaped hole (711).

8. The electric drive structure for the lower part of the vehicle sliding door according to claim 1, characterized in that: The lower hinge connector (8) includes a hinge plate (81) which is hinged to the lower hinge. The hinge plate (81) is rotatably connected to a support wheel (82), which is supported in the lower hinge guide groove (131). A clamping plate (83) is bolted to the bottom of the hinge plate (81). The timing belt (2) passes between one side of the hinge plate (81) and the clamping plate (83), and then the timing belt (2) is wrapped around the shaft of the support wheel (82). The timing belt (2) also passes between the other side of the hinge plate (81) and the clamping plate (83). The clamping plate (83) and the hinge plate (81) together clamp the timing belt (2).

9. The electric drive structure for the lower part of the vehicle sliding door according to claim 8, characterized in that: It also includes a guide rail (84), which is installed in the lower hinge guide groove (131). A guide wheel (85) is rotatably connected to the hinge plate (81), and the guide wheel (85) is rolled in the guide rail (84).

10. A vehicle, characterized in that: The electric drive structure for the lower part of the vehicle sliding door as described in any one of claims 1-9 is applied.

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