Adjustable chain tensioning device

Abstract

An adjustable chain tensioning device comprises a tensioning support, an adjusting structure and a chain wheel connected to the lower portion of the tensioning support through the adjusting structure. An adjusting channel is formed in the hollow interior of the tensioning support, and the adjusting structure moves along the adjusting channel to drive the chain wheel to move to adjust tensioning of the chain. The position of the chain wheel is adjusted through the adjusting structure, and the tension degree of the chain is adjusted.

Description

Technical Field

[0001] The utility model belongs to the field of chain transmission, and in particular relates to an adjustable chain tensioning device. Background Art

[0002] Chain drive is a common mechanical power transmission method that transmits power through a chain driven by a sprocket (gear). A chain typically consists of a series of metal rings connected by pins to form a closed loop. The main components of a chain drive system include a driving sprocket, a driven sprocket, and the chain connecting them.

[0003] Chain drives are widely used in various mechanical equipment due to their high efficiency, reliability, and ability to transmit power over long distances, such as transmissions in bicycles, motorcycles, and automobiles, agricultural machinery, and industrial conveyor belts. In these applications, chains not only need to withstand high tension but also adapt to diverse working environments and conditions.

[0004] After a chain has been working for a long time, it may gradually become loose due to factors such as gravity, wear, and thermal expansion and contraction. Chain loosening can lead to the following situations:

[0005] Loose chain: A loose chain may cause loose engagement between the chain and sprocket, resulting in reduced transmission efficiency, increased noise, and accelerated wear of the chain and sprocket.

[0006] Chain detachment from gear: In some cases, if the chain is severely slack, especially when running at high speed, the chain may completely detach from the sprocket, causing transmission failure and even causing a safety accident.

[0007] Chain drop: In vertical or tilted transmission systems, the chain may drop downward due to gravity, and even a simple retaining mechanism cannot effectively prevent this problem. While this retaining mechanism can prevent the chain from falling completely, it cannot prevent the chain from detaching from the sprocket or maintain proper tension. Utility Model Content

[0008] The utility model aims to provide an adjustable chain tensioning device to solve the technical problem of improving the stability of a chain transmission system by adjusting the chain tension.

[0009] To achieve the above-mentioned purpose, the specific technical solution of an adjustable chain tensioner of the present invention is as follows:

[0010] An adjustable chain tensioning device includes a tensioning bracket, an adjustment structure, and a sprocket connected to the bottom of the tensioning bracket through the adjustment structure; an adjustment channel is provided in the hollow interior of the tensioning bracket, and the adjustment structure moves along the adjustment channel, driving the sprocket to move and adjust the tension of the chain.

[0011] As a further improvement of the present invention, the adjustment structure includes guide blocks accommodated in the adjustment channel at both ends, an adjustment rod located on the outside of the tensioning bracket and extending toward the adjustment channel, and an adjustment top block arranged in the adjustment channel and located on the outside of the guide block; the sprocket is connected to the lower end of the guide block through a sprocket shaft, and the extension and retraction of the adjustment rod drives the adjustment top block to push the guide block in the adjustment channel, thereby driving the sprocket to move.

[0012] As a further improvement of the present invention, an elastic component connecting the guide block and the adjusting top block is provided in the adjusting channel.

[0013] As a further improvement of the present invention, an adjustment slot for the sprocket shaft to pass through is provided at the lower end of the tensioning bracket, and the width of the adjustment slot limits the movement range of the sprocket shaft.

[0014] As a further improvement of the present invention, an adjusting rod bracket is provided on the outside of the tensioning bracket, and the adjusting rod passes through the adjusting rod bracket and enters the adjusting channel.

[0015] As a further improvement of the present invention, a locking structure is provided on the adjusting rod bracket to lock the position of the adjusting rod after the adjusting rod passes through.

[0016] As a further improvement of the present invention, the two ends of the guide block and the adjusting top block respectively match the shape of the inner wall of the adjusting channel, and the adjusting channel is parallel to the rotating surface of the sprocket.

[0017] As a further improvement of the present invention, the sprocket is a driven wheel, which rotates under the drive of the chain.

[0018] As a further improvement of the present invention, the adjusting rod is an external thread structure, the locking structure is an internal thread hole provided on the adjusting rod bracket, and the adjusting rod passes through the internal thread hole into the adjusting channel.

[0019] As a further improvement of the present invention, both ends of the guide block and the adjusting top block are respectively slidably connected to the adjusting channel, ensuring that the guide block and the adjusting top block move smoothly along the adjusting channel.

[0020] Beneficial effects:

[0021] This utility model uses an adjustable rod that can be extended and retracted. This directly drives the adjustable top block along the adjustment channel, which in turn drives the guide block to move the sprocket, achieving precise adjustment of the chain tension. By extending and retracting the adjustable rod, the chain tension can be fine-tuned, ensuring that the chain is always in the optimal tension state and reducing chain wear and noise.

[0022] The guide block matches the shape of the adjustment channel, ensuring that the guide block moves smoothly along the adjustment channel, thereby improving the stability and reliability of the adjustment process.

[0023] The adjustment slot provided at the lower end of the tensioning bracket can limit the movement range of the sprocket shaft, ensuring accurate control of the sprocket position, while also facilitating installation and adjustment.

[0024] The elastic component arranged in the adjustment channel can stabilize the position of the guide block when the adjustment rod is not in full contact with the adjustment top block, ensuring that the chain always maintains an appropriate tension state during the adjustment process.

[0025] When the adjusting rod contacts the adjusting top block, the elastic component can provide a certain restoring force to assist in chain tensioning, thereby improving the adjustment accuracy and response speed.

[0026] The tension is adjusted by adjusting the lever, which is easy and quick to operate without complicated tools, greatly simplifying the maintenance process. In addition, the small size allows the chain to be tensioned in a limited space.

[0027] The locking structure on the adjustment rod bracket ensures that the position of the adjustment rod will not change due to vibration or other external forces, thereby improving the stability of the device.

[0028] The chain tensioning device provided by the utility model is applicable to various types of chain transmission systems, and can effectively perform tension adjustment regardless of light load or heavy load application to meet the needs under different working conditions.

[0029] By maintaining the proper tension of the chain, the chain can be effectively prevented from jumping teeth or falling off during operation, reducing the equipment failure rate, improving operational safety and the overall efficiency of the equipment.

[0030] Easy to adjust and lock:

[0031] The threaded structure of the adjusting rod is used in conjunction with the internal threaded hole on the adjusting rod bracket, which not only facilitates adjustment, but also allows the adjusting rod to be locked in position by rotating it, ensuring that the tension after adjustment will not change.

[0032] In summary, the utility model provides a chain tensioning device with a simple structure, convenient adjustment, wide applicability, and safety and reliability. It can significantly improve the performance of the chain transmission system and reduce maintenance costs. It is an important technological advancement in the field of chain transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of an adjustable chain tensioning device of the present utility model;

[0034] Figure 2 It is a cross-sectional view of the structure of an adjustable chain tensioner;

[0035] Explanation of the marks in the figure: 10. Tensioning bracket; 11. Adjustment channel; 12. Adjustment slot; 20. Adjustment structure; 21. Guide block; 22. Adjustment rod; 23. Adjustment top block; 24. Elastic component; 25. Adjustment rod bracket; 26. Locking structure; 30. Sprocket; 31. Sprocket shaft; 40. Fixed bracket. DETAILED DESCRIPTION

[0036] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0037] Implementation example:

[0038] like Figure 1 As shown, an adjustable chain tensioner is fixed to a fixed bracket 40 by screws, and a sprocket 30 is connected to the adjustment structure 20 through a sprocket shaft 31 and passes downward through the fixed bracket 40, wherein the sprocket 30 is a driven wheel that rotates under the drive of the chain.

[0039] like Figure 2 As shown, the tensioning bracket 10 is a box-shaped hollow cavity with a horizontal adjustment channel 11 disposed within the hollow interior. The adjustment channel is parallel to the direction of chain movement. In this embodiment, the adjustment channel 11 and the guide block 21 are matching arc-shaped, allowing the guide block 21 to slide smoothly within the adjustment channel 11. The ends of the guide block 21 are inserted into the adjustment channel 11. A downwardly extending sprocket shaft 31 is connected to the middle of the guide block 21. The lower end of the sprocket shaft 31 passes through an adjustment slot 12 on the lower end surface of the tensioning bracket 10 and is connected to the sprocket 30. The width of the adjustment slot 12 restricts the movement of the sprocket shaft 31, preventing the sprocket shaft from swinging and affecting the stability of the chain.

[0040] In the adjustment structure 20, both ends of the guide block 21 are positioned within the adjustment channel 11. The adjustment rod 22 extends from the outside of the tensioning bracket 10 into the adjustment channel 11. An adjustment top block 23 is positioned outside the guide block 21 within the adjustment channel 11. An elastic member 24 is positioned between the guide block 21 and the top block 23. In this embodiment, the elastic member 24 is a spring. When the adjustment rod 22 is not fully in contact with the top block 23, the elastic member 24 stabilizes the position of the guide block 21. In the default state, the top of the adjustment rod 22 slightly abuts the outside of the top block 23, preventing the top block 23 from sliding out of the adjustment channel 11. In this embodiment, the adjustment rod 22 is a bolt. The adjustment rod bracket 25 is fixed to the upper end surface of the fixed bracket 40 by bolts or welding. The adjustment rod bracket 25 has a threaded hole corresponding to the adjustment rod 22 and a locking nut 26 that restricts movement of the adjustment rod 22. In this embodiment, the locking member 26 is a nut mounted on the adjustment rod bracket 25. The bolt passes through the nut and extends into the adjustment channel 11. The degree of extension and retraction is adjusted by rotating the bolt.

[0041] When the chain shows signs of loosening, the extension distance of the adjusting rod 22 is adjusted to push the top block 23 to move within the adjustment channel 11, thereby squeezing the spring component 24. The elastic force of the elastic component 24 pushes the guide block 21, or directly contacts the guide block 21 to push the guide block 21. The guide block 21 moves and drives the sprocket 30 to tighten the chain. To achieve the desired tension, the adjusting rod 22 can be rotated to engage the internal threaded hole on the adjusting rod bracket 25, locking the position of the adjusting rod 22 to ensure that the chain tension does not change. During the adjustment process, the elastic component 24 can provide appropriate tensioning force, helping the guide block 21 to remain stable and ensuring that the chain is always properly tensioned during operation. At the same time, the elastic force of the elastic component 24 exists. When the chain transmission system is stuck or the resistance is too great, the elastic component 24 will compress again, causing the chain to be in a relaxed state, effectively protecting the chain transmission system.

[0042] The chain tensioner provided by this utility model features a simple structure and easy adjustment, effectively resolving the problem of difficulty maintaining chain tension. By precisely adjusting the chain tension, chain wear is reduced, the service life of the chain and related transmission components is extended, and the chain drive system is effectively protected. A locking mechanism ensures that the adjusted tension is not affected by external factors, thereby improving the stability and safety of equipment operation.

[0043] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. An adjustable chain tensioner, characterized in that: It includes a tensioning bracket, an adjustment structure, and a sprocket connected below the tensioning bracket through the adjustment structure; An adjustment channel is provided in the hollow interior of the tensioning bracket, and the adjustment structure moves along the adjustment channel to drive the sprocket to move and adjust the tension of the chain; The adjustment structure includes guide blocks accommodated in the adjustment channel at both ends, an adjustment rod located outside the tensioning bracket and extending toward the adjustment channel, and an adjustment top block provided in the adjustment channel and outside the guide block; the sprocket is connected to the lower end of the guide block via a sprocket shaft, and the extension and retraction of the adjustment rod drives the adjustment top block to push the guide block in the adjustment channel, thereby driving the sprocket to move; An elastic component connecting the guide block and the adjusting top block is provided in the adjusting channel.

2. The adjustable chain tensioner according to claim 1, characterized in that An adjustment slot for the sprocket shaft to pass through is provided at the lower end of the tensioning bracket, and the width of the adjustment slot limits the moving range of the sprocket shaft.

3. The adjustable chain tensioner according to claim 1, characterized in that An adjusting rod bracket is provided on the outside of the tensioning bracket, and the adjusting rod passes through the adjusting rod bracket and enters the adjusting channel.

4. The adjustable chain tensioner according to claim 3, characterized in that The adjusting rod bracket is provided with a locking structure for locking the position of the adjusting rod after the adjusting rod passes through.

5. The adjustable chain tensioner according to claim 1, characterized in that The two ends of the guide block and the adjusting top block respectively match the shape of the inner wall of the adjusting channel, and the adjusting channel is parallel to the rotating surface of the sprocket.

6. The adjustable chain tensioner according to claim 1, characterized in that The sprocket is a driven wheel and rotates under the drive of the chain.

7. The adjustable chain tensioner according to claim 4, characterized in that The adjusting rod is an external thread structure, the locking structure is an internal thread hole provided on the adjusting rod bracket, and the adjusting rod passes through the internal thread hole and enters the adjusting channel.

8. The adjustable chain tensioner according to claim 5, characterized in that The two ends of the guide block and the adjusting top block are respectively slidably connected to the adjusting channel, so as to ensure that the guide block and the adjusting top block move smoothly along the adjusting channel.

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