Driving device with built-in tensioning structure

Abstract

This application discloses a drive device with a built-in tensioning structure, characterized in that it includes: a housing, a first winding wheel and a second winding wheel stacked together at one end of the housing, a transmission component between the first winding wheel and the second winding wheel, and a tension spring between the first winding wheel and the second winding wheel. When the first winding wheel or the second winding wheel rotates, the tension spring is twisted. By using the above method, by setting a tension spring in the first winding wheel and the second winding wheel, and driving the first winding wheel and the second winding wheel to rotate sequentially through the transmission component, the tension of the first cable and the second cable during the movement is achieved, avoiding the problem of cable skipping. Moreover, the built-in tension spring makes the structure of the front cover device and the rear cover device simpler, the installation more flexible, and the volume smaller, which meets the current vehicle body space layout requirements. Furthermore, the first winding wheel and the second winding wheel can be designed with a large wheel diameter, resulting in a larger stroke and meeting the needs of large stroke applications.

Description

Technical Field

[0001] This utility model relates to the field of automotive door technology, and in particular to a drive device with a built-in tensioning structure. Background Technology

[0002] With the development of automotive automation and intelligence, car doors have gradually achieved automatic opening and closing, greatly improving the convenience of car use for users. Currently, the automatic drive mechanism for car doors in China generally adopts a worm gear connection method, which has problems such as easy slippage of the worm gear, high noise, complex parts structure, and large space occupation, thus failing to effectively match the spatial layout requirements of various car doors.

[0003] To address this, engineers designed a stable, low-noise, and compact automotive door drive mechanism, as illustrated by the Chinese authorized utility model patent, announcement number CN221073902U (Synchronous Drive Mechanism for Electric Sliding Doors and Electric Sliding Door). This mechanism utilizes a combination of ball joints and cables, along with a combination of synchronous belts, helical gears, and winding pulleys. This solves the problems of slippage, high noise, complex structure, and large space occupation inherent in existing automotive door automatic drive mechanisms, achieving stable, low-noise, and compact automatic opening and closing functions, adapting to the space requirements of various vehicle models. However, in actual use, it was found that the tensioning structure of this drive mechanism is designed within the front and rear end covers, resulting in a large volume. In some models, the C-pillar space is insufficient for its placement. Furthermore, the winding pulley is small, and its travel is unsuitable for large-opening doors, such as those in MPVs, RVs, and commercial vehicles equipped with sliding doors, where the large door opening makes it unsuitable.

[0004] Therefore, there is an urgent need to design a drive device with a built-in tensioning structure to solve one or more technical problems that are lacking in the existing technology. Utility Model Content

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a driving device with a built-in tensioning structure, characterized in that it includes: a housing, a drive motor fixedly installed at one end of the housing, a transmission component installed on one side of the drive motor, the transmission component being drivenly connected to the drive motor, the output end of the transmission component having a first winding wheel and a second winding wheel stacked together, a transmission member being provided between the first winding wheel and the second winding wheel, the first winding wheel and the second winding wheel being rotatable relative to the transmission member within a predetermined angle, the output shaft of the transmission component being connected to the transmission member, the transmission component driving the transmission member to rotate, the transmission member driving the first winding wheel and the second winding wheel to rotate, a tension spring being provided between the first winding wheel and the second winding wheel, one end of the tension spring being connected to the first winding wheel, the other end of the tension spring being connected to the second winding wheel, the tension spring being twisted when the first winding wheel or the second winding wheel rotates;

[0006] The outer upper edge of the first winding wheel is wound with a first cable in a clockwise or counterclockwise direction. One end of the first cable passes through one end of the outer shell and is connected to a front end cover device. The outer upper edge of the second winding wheel is wound with a second cable. The winding direction of the second cable is opposite to that of the first cable. One end of the second cable passes through the other end of the outer shell and is connected to a rear end cover device.

[0007] In a preferred embodiment, the outer side of the first winding wheel is provided with a first winding groove in a spiral shape, and the outer side of the second winding wheel is provided with a second winding groove in a spiral shape. The first winding groove and the second winding groove rotate in opposite directions. The end of the first cable that is away from the housing is located in the first winding groove and connected to the first winding wheel. The end of the second cable that is away from the housing is located in the second winding groove and connected to the second winding wheel.

[0008] In a preferred embodiment, the transmission member has two opposing first protrusions on its top outer side and two opposing second protrusions on its bottom outer side. The first winding wheel has a first limiting part that abuts against the first protrusions, and the second winding wheel has a second limiting part that abuts against the second protrusions. The transmission member drives the first winding wheel to rotate by the abutment between the first protrusions and the first limiting part, and the transmission member drives the second winding wheel to rotate by the abutment between the second protrusions and the second limiting part.

[0009] In a preferred embodiment, the transmission assembly includes: a synchronous pulley and a helical gear. The synchronous pulley is connected to the output end of the drive motor via a belt. A drive gear is coaxially mounted on the synchronous pulley. The drive gear meshes with the helical gear. A splined shaft is connected to the helical gear. The transmission component is connected to the splined shaft.

[0010] In a preferred embodiment, the housing includes a bottom shell and a top shell; the drive motor and the transmission assembly are both located inside the bottom shell, the first winding wheel, the second winding wheel, and the transmission component are all located inside the top shell, and the top shell separates the first winding wheel and the second winding wheel from the transmission assembly.

[0011] In a preferred embodiment, the top shell has two cable inlets extending in opposite directions on one side, and the front cover device and the rear cover device are connected to the corresponding cable inlets by cable sleeves.

[0012] In a preferred embodiment, both the front cover device and the rear cover device are provided with wheels.

[0013] In a preferred embodiment, a set of tensioning pulleys is provided between the synchronous pulley and the drive motor, and a set of pressure pulleys is also provided at the connection between the drive motor and the belt.

[0014] The beneficial effects of this utility model are as follows: by setting a tension spring in the first winding wheel and the second winding wheel, and driving the first winding wheel and the second winding wheel to rotate successively through the transmission component, the tension of the first cable and the second cable during the movement is realized, avoiding the problem of cable skipping. In addition, the built-in tension spring makes the structure of the front cover device and the rear cover device simpler, the installation more flexible, and the size smaller, which meets the current needs of vehicle body space layout. Furthermore, the first winding wheel and the second winding wheel can be designed with a large wheel diameter and a larger stroke to meet the needs of large stroke use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is an exploded view of the present invention;

[0017] Figure 3 This is a schematic diagram of the transmission component of this utility model;

[0018] Figure 4 This is a schematic diagram of the transmission component of this utility model;

[0019] Figure 5 This is a cross-sectional view of the present invention;

[0020] Figure 6 This is a cross-sectional view of the first winding wheel and the transmission component of this utility model in their mating state;

[0021] Figure 7 This is a cross-sectional view of the second winding wheel of this utility model in the state of cooperation with the transmission component;

[0022] Figure 8 This is a schematic diagram of the first arrangement of the tensioning wheel of this utility model;

[0023] Figure 9 This is a schematic diagram of the second configuration of the tensioning wheel of this utility model.

[0024] In the picture:

[0025] 10. Outer shell; 101. Bottom shell; 102. Top shell; 103. Cable inlet; 104. Cable sleeve; 105. Drive motor; 11. Tensioner pulley;

[0026] 20. Transmission assembly; 21. Synchronizing pulley; 22. Drive gear; 23. Helical gear; 24. Splined shaft;

[0027] 30. First winding wheel; 31. First winding groove; 32. First limiting part; 33. Second winding wheel; 34. Second winding groove; 35. Second limiting part; 36. Tension spring; 37. Transmission component; 38. First protrusion; 39. Second protrusion;

[0028] 40. Front cover device; 41. Rear cover device; 42. Rotary wheel. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0031] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0032] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] like Figures 1-9 As shown, this utility model provides a drive device with a built-in tensioning structure, characterized in that it includes: a housing 10, a drive motor 105 fixedly disposed at one end of the housing 10, a transmission assembly 20 disposed on one side of the drive motor 105, the transmission assembly 20 being drively connected to the drive motor 105, and a first winding wheel 30 and a second winding wheel 33 stacked on the output end of the transmission assembly 20, a transmission member 37 being disposed between the first winding wheel 30 and the second winding wheel 33, and the first winding wheel 30 and the second winding wheel 33 being respectively versatile relative to the transmission assembly 20. The component 37 rotates within a predetermined angle. The output end of the transmission assembly 20 is connected to the transmission component 37. The transmission assembly 20 drives the transmission component 37 to rotate. The transmission component 37 drives the first winding wheel 30 and the second winding wheel 33 to rotate. A tension spring 36 is also provided between the first winding wheel 30 and the second winding wheel 33. One end of the tension spring 36 is connected to the first winding wheel 30, and the other end of the tension spring 36 is connected to the second winding wheel 33. When the first winding wheel 30 or the second winding wheel 33 rotates, the tension spring 36 is twisted.

[0035] The outer upper edge of the first winding wheel 30 is wound with a first cable (not shown in the figure) in a clockwise or counterclockwise direction. One end of the first cable passes through one end of the outer shell 10 and is connected to a front end cover device 40. The outer upper edge of the second winding wheel 33 is wound with a second cable (not shown in the figure). The winding direction of the second cable is opposite to that of the first cable. One end of the second cable passes through the other end of the outer shell 10 and is connected to a rear end cover device 41.

[0036] Specifically, the transmission assembly 20 is located on one side of the drive motor 105, and the two are arranged along the transverse plane, which can effectively reduce the thickness of the housing 10 and improve the overall flatness of the housing 10. A transmission member 37 is passed through the output shaft of the transmission assembly 20, and the transmission member 37 is in transmission cooperation with the output shaft of the transmission assembly 20. At the same time, the upper end of the transmission member 37 is provided with a first winding wheel 30, and the lower end is provided with a second winding wheel 33. The first winding wheel 30 and the second winding wheel 33 are fitted together vertically, clamping the transmission member 37 between them. The first winding wheel 30 and the second winding wheel 33 are sleeved on the output shaft of the transmission assembly 20 through the transmission member 37, avoiding the first winding wheel 30 and the second winding wheel 33 from being attached to each other. The winding reel 33 is displaced relative to the transmission component 37 in the transverse plane, and to avoid displacement in the vertical plane, limiting components are fixedly provided at both the upper and lower ends of the output shaft of the transmission assembly 20. When the drive motor 105 runs, it drives the transmission component 37 to rotate through the transmission assembly 20, and the transmission component 37 then drives the first winding reel 30 and the second winding reel 33 to rotate. A first cable is wound on the outer side of the first winding reel 30, and a second cable is wound on the second winding reel 33. The first cable and the second cable are wound in opposite directions on the first winding reel 30 and the second winding reel 33. Therefore, it can be understood that when the first winding reel 30 and the second winding reel 33 are in the transmission component 37, the first cable and the second cable are wound in opposite directions on the first winding reel 30 and the second winding reel 33. When both cables rotate in the same direction, the first and second cables move in opposite directions, such as the second cable being released when the first cable retracts or vice versa. Since both the first and second cables are wound on the winding reels, to avoid length redundancy during movement that could cause the first or second cable to sag or become tangled, a tension spring 36 is provided between the first winding reel 30 and the second winding reel 33. The first and second winding reels 30 and 33 can rotate freely relative to the transmission member 37 within a predetermined angle, ensuring that the transmission member 37 always drives the first winding reel 30 first when rotating. The first or second winding wheel 33 rotates first, and then rotates synchronously together. In this way, the sequential rotation of the first winding wheel 30 and the second winding wheel 33 before synchronous rotation causes the tension spring 36 to be twisted, causing the tension spring 36 to tighten and generate a restoring force acting on the first winding wheel 30 and the second winding wheel 33. When the first or second cable has redundant length during movement, the restoring force of the tension spring 36 can promptly twist the corresponding winding wheel to retract or release the first and second cables for tension, thereby avoiding the problem of cable skipping. In addition, the free movement stroke of the first winding wheel 30 and the second winding wheel 33 also facilitates the installation and fixation of the cable.

[0037] Furthermore, the outer side of the first winding wheel 30 is provided with a first winding groove 31 in a spiral shape, and the outer side of the second winding wheel 33 is provided with a second winding groove 34 in a spiral shape. The first winding groove 31 and the second winding groove 34 rotate in opposite directions. The end of the first cable that is away from the outer casing 10 is located in the first winding groove 31 and connected to the first winding wheel 30. The end of the second cable that is away from the outer casing 10 is located in the second winding groove 34 and connected to the second winding wheel 33.

[0038] Specifically, to prevent the first and second cables from shifting on their respective winding reels, a spiral-shaped first winding groove 31 is provided on the outer side of the first winding reel 30, and a spiral-shaped second winding groove 34 is provided on the outer side of the second winding reel 33. The first winding groove 31 and the second winding groove 34 rotate in opposite directions. The first cable is located in the first winding groove 31, which restricts its displacement. The end of the first cable away from the outer casing 10 is engaged or fixedly connected to the first winding reel 30, so that when the first winding reel 30 rotates, the first cable can be wound around it and spirally wound through the first winding groove 31. The second cable is located in the second winding groove 34, which restricts its displacement. The end of the second cable away from the outer casing 10 is engaged or fixedly connected to the second winding reel 33, so that when the second winding reel 33 rotates, the second cable can be wound around it and spirally wound through the second winding groove 34, thus preventing stacking.

[0039] Furthermore, the transmission member 37 has two opposing first protrusions 38 protruding from its top outer side and two opposing second protrusions 39 protruding from its bottom outer side. The first winding wheel 30 has a first limiting part 32 inside that abuts against the first protrusions 38, and the second winding wheel 33 has a second limiting part 35 inside that abuts against the second protrusions 39. The transmission member 37 drives the first winding wheel 30 to rotate through the abutment between the first protrusions 38 and the first limiting part 32, and the transmission member 37 drives the second winding wheel 33 to rotate through the abutment between the second protrusions 39 and the second limiting part 35.

[0040] Specifically, to ensure that the first winding wheel 30 and the second winding wheel 33 rotate in a state where one rotates first and the two rotate synchronously, two opposing first protrusions 38 are provided on the outer top of the transmission member 37, and two opposing second protrusions 39 are provided on the outer bottom. Simultaneously, a first limiting part 32 is provided on the side of the first winding wheel 30 facing the transmission member 37, and a second limiting part 35 is provided on the side of the second winding wheel 33 facing the transmission member 37. The number of first limiting parts 32 and second limiting parts 35 corresponds to the number of first protrusions 38 and second protrusions 39, and the first limiting parts 32 and second limiting parts 35 are respectively located on the first protrusions 38 and second protrusions 39. On the rotation path, the first protrusion 38 and the second protrusion 39 abut against the first limiting part 32 and the second limiting part 35 after rotating a certain stroke. The abutment between the two pushes the first winding wheel 30 and the second winding wheel 33 to rotate. At the same time, since the first limiting part 32 and the second limiting part 35 can only abut against the first protrusion 38 and the second protrusion 39 at a single point and in a single direction, the first winding wheel 30 and the second winding wheel 33 have a degree of freedom to move within a predetermined stroke between themselves and the transmission member 37. Through the movement stroke of this degree of freedom, the first winding wheel 30 and the second winding wheel 33 are driven by the transmission member 37 in turn, thereby twisting the tension spring 36.

[0041] Furthermore, the transmission assembly 20 includes: a synchronous pulley 21 and a helical gear 23. The synchronous pulley 21 is connected to the output end of the drive motor 105 via a belt. A drive gear 22 is coaxially mounted on the synchronous pulley 21. The drive gear 22 meshes with the helical gear 23. A splined shaft 24 is connected in the helical gear 23. The transmission component 37 is connected to the splined shaft 24.

[0042] Specifically, the synchronous pulley 21 and the helical gear 23 form a reduction gear set, which is connected by a belt to achieve a high reduction ratio, small size, and avoid the instability and vulnerability of the primary reduction. In actual operation, the reaction force from the door is evenly distributed on the synchronous belt, which has a certain elasticity and high toughness. Even if the door impacts the drive unit with different complex vibrations or abnormal shaking, it can provide some buffering, thereby reducing gear wear and noise during gear meshing.

[0043] Furthermore, the outer casing 10 includes: a bottom casing 101 and a top casing 102; the drive motor 105 and the transmission assembly 20 are both located inside the bottom casing 101, the first winding wheel 30 and the second winding wheel 33 and the transmission component 37 are all located inside the top casing 102, and the top casing 102 separates the first winding wheel 30 and the second winding wheel 33 from the transmission assembly 20;

[0044] The top shell 102 has two cable inlets 103 extending in opposite directions on one side. The front cover device 40 and the rear cover device 41 are also connected to the corresponding cable inlets 103 by a cable sleeve 104.

[0045] Specifically, the outer shell 10 includes a bottom shell 101 and a top shell 102, which are fastened together. The drive motor 105 and the transmission assembly 20 are both located inside the bottom shell 101, while the first winding wheel 30 and the second winding wheel 33 are both located inside the top shell 102. A baffle is also provided at the position opposite to the helical gear 23 in the top shell 102. However, when the bottom shell 101 and the top shell 102 are fastened together, the top shell 102 uses the baffle to separate the first winding wheel 30 and the second winding wheel 33 from the helical gear 23, preventing them from being driven to rotate through contact. To prevent the first and second cables from contacting the door structure and causing friction and damage, cable sleeves 104 are provided between the front cover device 40 and the rear cover device 41 and the outer shell 10, respectively. The cable sleeves 104 protect the first and second cables located between the front cover device 40 and the rear cover device 41 and the outer shell 10.

[0046] Furthermore, both the front cover device 40 and the rear cover device 41 are equipped with rotating wheels;

[0047] Specifically, both the front cover device 40 and the rear cover device 41 have a housing and a rotating wheel 42 rotatably disposed within the housing. Since the first cable passes through the front cover device 40 and the second cable passes through the rear cover device 41 to connect with the external structure, in order to avoid friction between the first cable and the second cable and the front cover device 40 or the rear cover device 41 during movement, which would reduce the service life of the first cable and the second cable, a rotating wheel 42 is rotatably disposed within both the front cover device 40 and the rear cover device 41. This allows the portions of the first cable and the second cable located within the housing to contact the rotating wheel 42. When the first cable and the second cable move, they drive the rotating wheel 42 to rotate, thereby reducing the generation of friction.

[0048] Furthermore, a tensioning wheel is provided between the synchronous pulley 21 and the drive motor 105, and a pressure wheel is also provided at the connection between the drive motor 105 and the belt;

[0049] Specifically, since the synchronous pulley 21 and the drive motor 105 are connected by a belt drive, when the belt speed increases suddenly or the forward and reverse directions are reversed, the front and rear ends of the belt engaging with the synchronous pulley 21 will vibrate, causing the belt to skip teeth. This not only generates noise but also causes wear / deformation of the teeth, resulting in a rapid decrease in service life. To address this, a set of tension pulleys 11 is provided between the synchronous pulley 21 and the drive motor 105. In this embodiment, two tension pulleys 11 form a set, located on both sides of the belt, squeezing the belt from both sides to prevent belt skipping. The squeezing action of the tension pulleys 11 also increases the number of engagement points between the belt and the synchronous pulley 21 and the drive motor 105, improving stability. Alternatively, a set of two tension pulleys 11 can be provided at the end of the drive motor 105 connected to the belt, squeezing the belt from both sides to make the belt teeth mesh with the output teeth of the drive motor 105, thus preventing tooth skipping.

[0050] During operation, when the door is opened manually or electrically, the drive motor 105 runs. Since the first winding wheel 30 and the second winding wheel 32 have free travel, the first winding wheel 30 or the second winding wheel 33 will rotate sequentially, twisting the tension spring 36 and causing it to contract and generate a restoring force acting on the first winding wheel 30 and the second winding wheel 33, making them move in opposite directions. Thus, under the force of the tension spring 36, the first winding wheel 30 and the second winding wheel 33 will always keep the first and second cables taut. Similarly, since the first winding wheel 30 and the second winding wheel 32 have free travel, one of the first or second cables will always be under greater force or lag behind. At this time, the tension spring 36 will tighten the other cable through the winding wheel to prevent the cable from jumping.

[0051] In summary, by setting tension springs 36 inside the first winding wheel 30 and the second winding wheel 33, and driving the first winding wheel 30 and the second winding wheel 33 to rotate sequentially through the transmission component 37, the tension of the first cable and the second cable during movement is achieved, avoiding the problem of cable skipping. Furthermore, the built-in tension springs simplify the structure of the front cover device 40 and the rear cover device 41, making installation more flexible and reducing their size, which meets the current requirements for vehicle body space layout. Moreover, the first winding wheel 30 and the second winding wheel 33 can be designed with large wheel diameters, resulting in a larger stroke and meeting the needs of long-stroke applications.

[0052] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.

Claims

1. A drive device with a built-in tensioning structure, characterized in that, The device includes: a housing; a drive motor fixedly mounted inside one end of the housing; a transmission assembly mounted on one side of the drive motor; the transmission assembly being drively connected to the drive motor; an output end of the transmission assembly having a first winding wheel and a second winding wheel stacked together; a transmission member being provided between the first winding wheel and the second winding wheel; the first winding wheel and the second winding wheel being rotatable relative to the transmission member within a predetermined angle; an output shaft of the transmission assembly being connected to the transmission member; the transmission assembly driving the transmission member to rotate; the transmission member driving the first winding wheel and the second winding wheel to rotate; a tension spring being provided between the first winding wheel and the second winding wheel; one end of the tension spring being connected to the first winding wheel; and the other end of the tension spring being connected to the second winding wheel; the tension spring being torn when the first winding wheel or the second winding wheel rotates. The outer upper edge of the first winding wheel is wound with a first cable in a clockwise or counterclockwise direction. One end of the first cable passes through one end of the outer shell and is connected to a front end cover device. The outer upper edge of the second winding wheel is wound with a second cable. The winding direction of the second cable is opposite to that of the first cable. One end of the second cable passes through the other end of the outer shell and is connected to a rear end cover device.

2. The driving device with a built-in tensioning structure according to claim 1, characterized in that, The first winding wheel has a spiral first winding groove on its outer side, and the second winding wheel has a spiral second winding groove on its outer side. The first winding groove and the second winding groove rotate in opposite directions. The end of the first cable that is away from the outer casing is located in the first winding groove and connected to the first winding wheel. The end of the second cable that is away from the outer casing is located in the second winding groove and connected to the second winding wheel.

3. The driving device with a built-in tensioning structure according to claim 1, characterized in that, The transmission component has two opposing first protrusions on its top outer side and two opposing second protrusions on its bottom outer side. The first winding wheel has a first limiting part that abuts against the first protrusions, and the second winding wheel has a second limiting part that abuts against the second protrusions. The transmission component drives the first winding wheel to rotate through the abutment between the first protrusions and the first limiting part, and the transmission component drives the second winding wheel to rotate through the abutment between the second protrusions and the second limiting part.

4. The driving device with a built-in tensioning structure according to claim 1, characterized in that, The transmission assembly includes: a synchronous pulley and a helical gear. The synchronous pulley is connected to the output end of the drive motor via a belt. A drive gear is coaxially mounted on the synchronous pulley. The drive gear meshes with the helical gear. A splined shaft is connected to the helical gear. The transmission component is connected to the splined shaft.

5. The driving device with a built-in tensioning structure according to claim 1, characterized in that, The housing includes a bottom shell and a top shell; the drive motor and the transmission assembly are both located inside the bottom shell, the first winding wheel, the second winding wheel and the transmission component are all located inside the top shell, and the top shell separates the first winding wheel and the second winding wheel from the transmission assembly.

6. The driving device with a built-in tensioning structure according to claim 5, characterized in that, The top shell has two cable inlets extending in opposite directions on one side, and the front cover device and the rear cover device are connected to the corresponding cable inlets by cable sleeves.

7. The driving device with a built-in tensioning structure according to claim 1, characterized in that, Both the front cover device and the rear cover device are equipped with rotating wheels.

8. The driving device with a built-in tensioning structure according to claim 4, characterized in that, A tensioning pulley is provided between the synchronous pulley and the drive motor, and a pressure pulley is also provided at the connection between the drive motor and the belt.

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