A drive tensioning device

Abstract

The present application belongs to the field of flexible transmission, and particularly relates to a transmission tensioning device. The transmission tensioning device comprises a transmission wheel support, a transmission wheel is arranged in the transmission wheel support, a tensioning wheel support is rotatably arranged on the transmission wheel support, the rotation axis of the tensioning wheel support is the same as the extension direction of the rotation axis of the transmission wheel, a locking mechanism is arranged between the tensioning wheel support and the transmission wheel support, a tensioning wheel is arranged on the tensioning wheel support, and the transmission wheel and the tensioning wheel are in the same plane. The transmission tensioning device has higher structural integration, and can equivalently regard the tensioning wheel and the transmission wheel as a large transmission wheel with a variable center position, so that the transmission is more stable. The transmission chain or the transmission belt is guided by the tensioning wheel, the space utilization of the transmission tensioning device is higher, the structure is more simple and compact, and the occupied space is smaller.

Description

Technical Field

[0001] This invention belongs to the field of flexible transmission, and in particular relates to a transmission tensioning device. Background Technology

[0002] Currently, flexible transmission systems are widely used due to their simple structure, strong adaptability, accurate average transmission ratio, and low manufacturing and installation costs. They consist of a driving pulley and a driven pulley mounted on a parallel shaft, and a chain or belt wound around the driving pulley. In actual use, the chain or belt, affected by wear and its own weight, will slack and elongate, leading to increased slack side sag, reduced tension, and problems such as poor meshing, slippage, and vibration. Currently, the main methods for adjusting chain or belt tension include manually adjusting the position of the drive shaft, or installing a weighted pulley or tensioning pulley on the slack side of the chain or belt to re-tension it.

[0003] Chinese utility model patent CN213419813U, authorized on June 11, 2021, discloses a chain tensioning device. This chain tensioning device is suitable for chain tensioning in confined spaces. One side of the chain housing is open and has a waist-shaped space. Two gears are rotatably mounted at both ends of the waist-shaped space, and a transmission chain meshing with the gears is mounted on each gear. The chain tensioning device is located on the chain housing between the two gears. The chain tensioning device includes a metal strip, one end of which is hinged to the chain housing, and the other end has a tensioning wheel for meshing with the chain. A fixing hole is provided in the middle of the metal strip, and a bolt is screwed into it to fix the metal strip, thus alleviating chain slack and suppressing noise and wear caused by chain slack.

[0004] Chinese utility model patent CN206592501U, published on October 27, 2017, discloses a transmission chain tensioning mechanism. This mechanism includes a fixed base, with the lower end of a rocker arm movably mounted thereon. The upper end of the rocker arm is connected to one side of the central bearing of a tension wheel, which presses against the inside of the transmission chain. The rocker arm has a tension adjustment structure. An elastic component is movably mounted on the fixed base at its lower end and movably connected to the tension adjustment structure at its upper end. This transmission chain tensioning mechanism has a simple structure, allows for manual multi-angle tension adjustment, prevents the tension wheel from disengaging, and enhances the stability of the device.

[0005] In summary, existing tensioning pulleys require additional fixing and installation via brackets or connecting plates during use, resulting in a large volume and space occupation. Moreover, during installation, the tensioning pulley is positioned between the two drive pulleys, and tension is achieved by directly pressing the slack side of the chain or belt. In a small-space transmission system, adjusting the chain or belt tension by changing the installation angle of the tensioning pulley bracket or connecting plate is prone to interference with the drive pulleys. This results in low integration, a complex spatial structure, and a lack of compactness. Summary of the Invention

[0006] The purpose of this invention is to provide a transmission tensioning device to solve the technical problems of existing transmission tensioning devices having large space occupation, low integration, and insufficient compactness.

[0007] To achieve the above objectives, the technical solution of the transmission tensioning device provided by the present invention is as follows:

[0008] A transmission tensioning device includes a transmission wheel support, a transmission wheel is disposed within the transmission wheel support, and a tensioning wheel support is rotatably mounted on the transmission wheel support. The rotation axis of the tensioning wheel support relative to the transmission wheel support is in the same direction as the extension of the rotation axis of the transmission wheel. A locking mechanism is provided between the tensioning wheel support and the transmission wheel support. A tensioning wheel is mounted on the tensioning wheel support, and the transmission wheel and the tensioning wheel are in the same plane.

[0009] The beneficial effects are as follows: This invention changes the installation position of the traditional transmission tensioning device, improving its integration. The tensioning wheel support is rotatably mounted on the transmission wheel support, with the transmission wheel and tensioning wheel on the same plane. The tensioning wheel can guide the transmission chain or belt. The rotation axis of the tensioning wheel support relative to the transmission wheel support extends in the same direction as the rotation axis of the transmission wheel, resulting in higher space utilization, higher integration, and a simpler, more compact structure. During rotation, the tensioning wheel support does not interfere with the transmission wheel. Without reducing the wrap angle of the transmission chain or belt, the tensioning wheel and transmission wheel can be equivalent to a large transmission wheel with a variable center position. The diameter of this large transmission wheel is the sum of the radius of the tensioning wheel, the radius of the transmission wheel, and the distance between their centers, making the transmission smoother. By using a locking mechanism to adjust and lock the tension wheel support at a set angle, the adjustment and locking are achieved simultaneously, further simplifying the structure of the transmission tensioning device. By changing the installation angle of the tension wheel support, the center position of the equivalent large transmission wheel can be changed, thereby more effectively adjusting the tension of the transmission chain or belt. The structure is simpler and more compact, making it easier to adjust, maintain, and repair the transmission tensioning device in small spaces, resulting in a more compact structure and a smaller footprint.

[0010] As a further improvement, the rotation axis of the tension wheel support relative to the transmission wheel support is collinear with the rotation axis of the transmission wheel.

[0011] The beneficial effect is that by making the rotation axis of the tensioning wheel support relative to the transmission wheel support collinear with the rotation axis of the transmission wheel, the overall structure of the transmission tensioning device can be more concentrated and compact, thus occupying less space.

[0012] As a further improvement, the tension wheel support includes support plates arranged opposite each other along the axial direction of the tension wheel, and the transmission wheel is rotatably mounted on the corresponding support plates.

[0013] The beneficial effects are: the support plates arranged axially opposite to the tensioning wheel allow the tensioning wheel support to be installed and fixed simultaneously from both sides of the transmission wheel, providing balanced support from both sides of the tensioning wheel. This makes the tensioning operation of the transmission tensioning device more stable and reliable, improving the installation stability of the transmission tensioning device and extending its service life. The transmission wheel rotates and is mounted on the corresponding support plate, resulting in higher integration of the transmission tensioning device, reduced space occupation, and a more compact structure. At the same time, the transmission wheel does not affect the rotation of the tensioning wheel support.

[0014] As a further improvement, the support plate is provided with a bearing seat, and a bearing is provided inside the bearing seat. The transmission wheel is rotatably mounted on the corresponding support plate through the bearing.

[0015] The beneficial effects are: by setting the bearing housing on the support plate, that is, the bearing housing of the transmission wheel and the tensioning wheel support are fixedly connected to form a whole, and the transmission wheel can be mounted on the support plate, the structure of the transmission tensioning device can be simplified and made more compact, while improving the integration of the transmission tensioning device.

[0016] As a further improvement, the locking mechanism includes adjustment holes respectively provided on the transmission wheel support and the tension wheel support, and fasteners corresponding to the adjustment holes.

[0017] The beneficial effects are: by setting the locking mechanism as an adjustment hole and its corresponding fastener, the structure is simple and easy to process, which further simplifies the structure of the transmission tensioning device.

[0018] As a further improvement, the adjusting hole on one of the transmission wheel support and the tension wheel support is an arc-shaped elongated hole, and the other is a discretely distributed threaded hole, and the fastener is a clamping bolt.

[0019] The beneficial effects are: setting it to have an arc-shaped elongated hole and a threaded hole facilitates the rotation and adjustment of the tension wheel support's installation angle. The installation angle can be set to any value within the range of the arc-shaped elongated hole, making the installation angle adjustment more adaptable and flexible. At the same time, the arc-shaped elongated hole structure is simple and easy to process, making the structure of the transmission tensioning device simpler. Loosening the clamping bolt, rotating the tension wheel support to the tensioning angle, and tightening the clamping bolt will achieve the tensioning of the transmission chain or transmission belt, making the adjustment process simpler and easier to operate.

[0020] As a further improvement, the axle length of the tensioning wheel is less than the spacing width of the transmission wheel support.

[0021] The beneficial effect is that the axle length of the tensioning wheel is smaller than the spacing width of the transmission wheel support, which can further reduce the space occupied and make the transmission tensioning device more compact.

[0022] As a further improvement, the tensioning wheel support is provided with a bent section facing the tensioning wheel.

[0023] The beneficial effects are: setting a bent section on the tensioner support facing the tensioner makes it easier to install tensioners with shorter shaft lengths, and at the same time, the bent section can provide more stable support for the tensioner, reducing space occupation.

[0024] As a further improvement, the end of the tension wheel support away from the transmission wheel is provided with a support sleeve that rotates with the axle of the tension wheel.

[0025] The beneficial effects are: the support sleeve set on the rotating engagement of the tensioning wheel axle can provide stable support for the tensioning wheel, making the force on the tensioning wheel more balanced when it is pressed with the chain or belt, and the transmission and meshing effect during tensioning more stable and accurate.

[0026] As a further improvement, a rotation limiting structure is provided between the transmission wheel support and the tension wheel support.

[0027] The beneficial effects are: setting a rotation limit structure can effectively limit the rotation range of the tension wheel support, prevent excessive rotation, and save space occupied by the transmission tensioning device. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the transmission tensioning device in this invention;

[0029] Figure 2 for Figure 1 A side view of the transmission tensioning device shown;

[0030] Figure 3 This is a schematic diagram of the support plate structure of the tension wheel support in Example 1.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Drive wheel shaft; 2. Sealing ring; 3. Cover; 4. Bearing; 5. Support plate; 6. Drive wheel; 7. Drive wheel support; 8. Key; 9. Fastening bolt; 10. End cap; 11. Dustproof ring; 12. Tightening bolt; 13. Tensioner wheel. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0038] The present invention will be further described in detail below with reference to the embodiments.

[0039] Specific embodiment 1 of the transmission tensioning device provided by the present invention:

[0040] The innovation of the transmission tensioning device of the present invention compared with the transmission tensioning device of the prior art lies in that the tensioning wheel support of the transmission tensioning device of the present invention is installed on the transmission wheel support 7, rather than between the two transmission wheel shafts 1. The rotation axis of the tensioning wheel support relative to the transmission wheel support 7 is in the same direction as the extension direction of the rotation axis of the transmission wheel 6, and the transmission wheel 6 and the tensioning wheel 13 are in the same plane. Therefore, the tensioning wheel 13 can be used to guide the transmission chain or transmission belt. At the same time, without reducing the wrap angle of the transmission chain, the tensioning wheel 13 and the transmission wheel 6 can be equivalent to a large transmission wheel 6 with a variable center position. The diameter of the large transmission wheel 6 is the sum of the radius of the tensioning wheel 13, the radius of the transmission wheel 6 and the distance between their centers, making the transmission smoother, the structure of the transmission tensioning device more compact, the space occupied smaller, and the probability of interference with the transmission wheel 6 during tension adjustment is reduced, making the transmission tensioning device more suitable for small space occasions.

[0041] like Figure 1 , Figure 2 , Figure 3 As shown, the transmission tensioning device provided in this embodiment includes a transmission wheel support 7. Reinforcing ribs are provided on both sides of the transmission wheel support 7 to further provide stable support and protection for the smooth operation of the transmission wheel 6. A tensioning wheel support is also rotatably mounted on the transmission wheel support 7. The tensioning wheel support is held between the two sides of the transmission wheel support 7 by two identical support plates 5 joined together. The support plates 5 are arranged opposite each other along the axial direction of the tensioning wheel, allowing the tensioning wheel support to be simultaneously installed and fixed from both sides of the transmission wheel 6. This balanced force on both sides makes the tensioning operation of the transmission tensioning device more stable and reliable, improving the installation stability of the transmission tensioning device and extending its service life. Furthermore, bearing seats for the transmission wheel 6 are fixedly connected to the support plates 5 on both sides, reducing space occupation, making the structure compact, and improving integration.

[0042] The tension wheel support is installed with its rotation axis collinear with that of the transmission wheel support 7 via a bearing housing. This allows the two side support plates 5 to be coaxially mounted on the transmission wheel support 7 with the transmission wheel 6, and also allows the transmission wheel 6 to be simultaneously located within both the transmission wheel support 7 and the tension wheel support, resulting in smoother operation of the transmission wheel 6. The opening in the circular hole of the support plate 5 at the bearing housing mounting position is used to avoid the reinforcing ribs on the transmission wheel support 7 during installation. This allows the tension wheel support to be installed directly from both sides of the transmission wheel support 7 without disassembling the transmission wheel support 7 and other structures, improving installation efficiency. Coaxial installation of the tension wheel support and the transmission wheel 6 allows the transmission tensioning device to guide the tensioning of the chain, and also makes the structure of the transmission tensioning device more compact and space-saving.

[0043] In this embodiment, a locking mechanism is also provided between the support plates 5 on both sides of the tension wheel support and the transmission wheel support 7. This locking mechanism consists of arc-shaped elongated holes symmetrically distributed on the outer periphery of the transmission wheel 6, making the force distribution of the locking mechanism of the tension wheel support more balanced. Furthermore, corresponding distributed threaded holes are provided at the corresponding positions on the transmission wheel support 7. Several clamping bolts 12 pass through the annular through holes and are threadedly connected to the threaded holes, allowing the tension wheel support to be fixedly installed on the transmission wheel support 7 at the required set angle. Simultaneously, the arc-shaped elongated holes are not interconnected, so the area of ​​the support plate 5 between the two arc-shaped elongated holes can serve as a rotation limiting structure, limiting the adjustment range of the tension wheel support. The set installation angle can be any value within the adjustment range, making the installation angle adjustment more adaptable and flexible. The reinforcing ribs of the transmission wheel support 7 are provided with corresponding avoidance structures to prevent interference with the rotation of the tension wheel support. The locking mechanism of the transmission tensioning device also serves as a fixing structure. By changing the installation angle of the tensioning wheel support, the center position of the equivalent large transmission wheel 6 can be altered, thereby adjusting the tension of the transmission chain. This is simple and easy to operate, making the structure of the transmission tensioning device more compact and reducing space occupation. Rotating the tensioning wheel support will not cause spatial interference with the coaxial tensioning wheel 13, reducing the probability of interference between the tensioning wheel 13 and the transmission wheel 6, and facilitating maintenance and repair of the transmission tensioning device in confined spaces.

[0044] like Figure 1 , Figure 2 As shown, in this embodiment, the transmission wheel 6 of the transmission tensioning device is fixedly installed inside the bearing housing. Bearings 4 are fixedly installed on both sides inside the bearing housing. A transmission shaft is rotatably installed inside the bearing 4. The transmission shaft is connected to the transmission wheel 6 via a key 8 and has a non-rotational engagement. The transmission wheel 6 is located between the two bearings 4, and dustproof rings 11 are provided between the transmission wheel 6 and the bearings 4 on both sides. A through cover 3 and a blind cover 10 are respectively provided on the outside of the transmission wheel 6 to seal it. The through cover 3 and the blind cover 10 are fixedly installed on the outside of the bearing housing, which is fixed to the tensioning wheel support, through a threaded connection with the fastening bolts 9. This makes the installation of the through cover 3 and the blind cover 10 easier, improves the integration of the transmission tensioning device, and makes its spatial structure more compact. A sealing ring 2 is also installed between the through cover 3 or the blind cover 10 and the bearing 4 to ensure the sealing effect of the internal structure and prevent internal lubricating oil from seeping out.

[0045] like Figure 1 , Figure 2As shown, in this embodiment, the end of the tension wheel support away from the transmission wheel 6 is provided with a support sleeve that rotates with the axle of the tension wheel 13. The tension wheel 13 is installed inside the support sleeve, and the tension wheel support is fixedly connected to both sides of the tension wheel 13, so that the tension wheel support supports the tension wheel 13 on both sides of the tension wheel 13, making the force on the tension wheel 13 more balanced when it is pressed with the chain, and the transmission and meshing effect during tensioning more stable and accurate. One end of the tension wheel shaft of the tension wheel 13 is provided with a shoulder that stops with the tension wheel support, and the other end of the tension wheel shaft is threaded with a shaft cover. The shaft cover is pressed with the tension wheel support, and the shoulder and shaft cover fix the tension wheel 13 on the tension wheel support and prevent the axial movement of the tension wheel shaft. The tension wheel 13 is fixedly installed on the tension wheel shaft by a bearing 4. On both sides of the bearing 4, there are also stop rings that are pressed with the tension wheel support. The stop rings can limit the axial movement of the bearing 4 and ensure the smooth operation of the transmission tensioning device. The axle length of the tension wheel 13 is less than the width of the interval between the transmission wheel supports 7. The support plate 5 of the tension wheel support is provided with a bent section facing the tension wheel 13, which can further reduce the space occupation and make the transmission tensioning device structure more compact. At the same time, the bent section can be used to provide more stable support for the tension wheel 13.

[0046] When using the transmission tensioning device of the transmission system in this embodiment to tension the chain, first loosen the clamping bolt 12, then rotate the tensioning wheel support to the appropriate tensioning position and tighten the clamping bolt 12 again to complete the chain tensioning operation. The adjustment process is simple and easy to operate, and the adjustment efficiency is higher.

[0047] Specific embodiment 2 of the transmission tensioning device provided by the present invention:

[0048] In Example 1, the transmission tensioning device is used in a chain drive system. In this example, the transmission tensioning device can also be used in a belt drive system.

[0049] Specific embodiment 3 of the transmission tensioning device provided by the present invention:

[0050] In Embodiment 1, the rotation axis of the tension wheel support relative to the transmission wheel support 7 is collinear with the rotation axis of the transmission wheel 6. In this embodiment, the rotation axis of the tension wheel support relative to the transmission wheel support 7 is parallel to the rotation axis of the transmission wheel 6, that is, the tension wheel support is rotatably mounted on the transmission wheel support 7 near the transmission wheel 6.

[0051] Specific embodiment 4 of the transmission tensioning device provided by the present invention:

[0052] In Embodiment 1, the tension wheel support includes support plates 5 arranged opposite each other along the tension wheel axial direction. The transmission wheel 6 is rotatably mounted on the corresponding support plates 5, and the support plates 5 are symmetrically arranged on both sides of the tension wheel 13. In this embodiment, the support plate 5 can be provided only on one side of the tension wheel shaft. The tension wheel support has an H-shaped structure. The tension wheel shaft of the tension wheel 13 is connected to the support plate 5 on only one side, and a shaft cover is provided on the other side of the tension wheel shaft. The bearing 4 can be provided between the support plate 5 and the tension wheel shaft, so that the tension wheel shaft and the tension wheel 13 rotate synchronously, or the bearing 4 can be provided between the tension wheel shaft and the tension wheel 13, so that only the tension wheel 13 rotates.

[0053] Specific embodiment 5 of the transmission tensioning device provided by the present invention:

[0054] In Embodiment 1, a bearing seat is fixedly connected to the support plate 5, and a bearing 4 is provided inside the bearing seat. The transmission wheel 6 is rotatably mounted on the corresponding support plate 5 via the bearing 4. In this embodiment, the bearing seat of the transmission wheel 6 can be movably connected to the support plate 5.

[0055] Specific embodiment 6 of the transmission tensioning device provided by the present invention:

[0056] In Embodiment 1, the adjusting hole on the tension wheel support is an arc-shaped elongated hole, the adjusting hole on the transmission wheel support 7 is a discretely distributed threaded hole, and the fastener is a clamping bolt 12. In this embodiment, the positions of the threaded hole and the arc-shaped elongated hole can be interchanged, or the adjusting hole on the tension wheel support can be several through holes discretely distributed on the outer periphery of the transmission wheel 6, and the adjusting hole on the transmission wheel support 7 is also a threaded hole. Setting the locking mechanism as several through holes subdivides the set adjustment angle of the transmission tensioning device into several set values, but the fixing effect is better, and it can be locked with only one clamping bolt 12.

[0057] Specific embodiment 7 of the transmission tensioning device provided by the present invention:

[0058] In Embodiment 1, the axle length of the tensioning wheel 13 is less than the width of the interval between the transmission wheel supports 7, and the tensioning wheel supports have a bent section facing the tensioning wheel 13. In this embodiment, the axle length of the tensioning wheel 13 is the same as the width of the interval between the transmission wheel supports 7, and it is not necessary to provide a bent section facing the tensioning wheel 13 on the tensioning wheel supports.

[0059] Specific embodiment 8 of the transmission tensioning device provided by the present invention:

[0060] In Embodiment 1, the end of the tension wheel support away from the transmission wheel 6 is provided with a support sleeve that rotatably engages with the axle of the tension wheel 13. In this embodiment, the tension wheel axle can be directly fixedly mounted on one side support plate 5, and the tension wheel 13 can be rotatably engaged with it via bearing 4.

[0061] Specific embodiment 9 of the transmission tensioning device provided by the present invention:

[0062] In Embodiment 1, a rotation limiting structure is provided between the transmission wheel support 7 and the tension wheel support. The rotation limiting structure is a partition section between the arc-shaped elongated holes. In this embodiment, the clearance structure on the reinforcing rib plate can also be omitted, allowing it to mate with the opening of the circular hole in the support plate 5 to form a rotation limiting structure.

[0063] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transmission tensioning device, comprising a transmission wheel support (7), wherein a transmission wheel (6) is disposed within the transmission wheel support (7), characterized in that, A tensioning wheel support is rotatably mounted on the transmission wheel support (7). The rotation axis of the tensioning wheel support relative to the transmission wheel support (7) is collinear with the rotation axis of the transmission wheel (6). A locking mechanism is provided between the tensioning wheel support and the transmission wheel support (7). A tensioning wheel (13) is mounted on the tensioning wheel support. The transmission wheel (6) and the tensioning wheel (13) are on the same plane. The tensioning wheel support includes a support plate (5) arranged opposite to the tensioning wheel (13) along the axial direction. A bearing seat is provided on the support plate (5). A bearing (4) is provided inside the bearing seat. The transmission wheel (6) is rotatably mounted on the corresponding support plate (5) through the bearing (4).

2. The transmission tensioning device according to claim 1, characterized in that, The locking mechanism includes adjustment holes located on the transmission wheel support (7) and the tension wheel support, as well as fasteners corresponding to the adjustment holes.

3. The transmission tensioning device according to claim 2, characterized in that, The adjustment hole on one of the transmission wheel support (7) and the tension wheel support is an arc-shaped elongated hole, and the other is a discretely distributed threaded hole. The fastener is a clamping bolt (12).

4. The transmission tensioning device according to claim 1, characterized in that, The axle length of the tension wheel (13) is less than the spacing width of the transmission wheel support (7).

5. The transmission tensioning device according to claim 4, characterized in that, The tension wheel support is provided with a bent section facing the tension wheel (13).

6. The transmission tensioning device according to claim 5, characterized in that, The end of the tension wheel support away from the transmission wheel (6) is provided with a support sleeve that rotates with the axle of the tension wheel (13).

7. The transmission tensioning device according to claim 1, characterized in that, A rotation limit structure is provided between the transmission wheel support (7) and the tension wheel support.

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