Transmission belt tensioning structure for driving running machine driving roller and running machine

Abstract

The utility model relates to the field of treadmills, and discloses a driving belt tensioning structure for driving a driving roller of a treadmill and the treadmill, the driving belt tensioning structure comprises a tensioning wheel assembly, a driving belt component and a tensioning component, a driving wheel is coaxially fixed on a motor shaft of a driving motor, a driven wheel is coaxially fixed at the end part of the driving roller, and the tensioning component is connected with the driving wheel. The tensioning wheel assembly is located at the end, away from the driving wheel, of the driven wheel and comprises a first tensioning wheel and a second tensioning wheel which are coaxially fixed, and the transmission belt assembly comprises a first transmission belt wound between the driving wheel and the first tensioning wheel and a second transmission belt wound between the second tensioning wheel and the driven wheel. The fixing block is fixed to the treadmill, the sliding block slides on the treadmill or the fixing block in a guiding mode and is provided with a concentric shaft of the tensioning wheel assembly, the elastic piece drives the sliding block to be away from the fixing block, the tensioning structure can reduce abrasion or loosening caused by loosening of the transmission belt assembly, and then the replacement frequency of the transmission belt assembly is reduced.

Description

Technical Field

[0001] This utility model relates to the field of treadmills, and in particular to a transmission belt tensioning structure for driving the active roller of a treadmill and a treadmill. Background Technology

[0002] The existing treadmill running belt drive rod assembly includes an active roller, a driven roller, and a running belt wound around both. The active roller rotates on the running platform and is driven by a drive motor. The connection structure between the active roller and the drive motor can be referred to as a treadmill disclosed in Chinese Patent No. CN221998781U. A driven wheel is coaxially fixed at one end of the active roller, and a drive wheel is coaxially fixed on the motor shaft of the drive motor. The active wheel and the drive wheel are synchronously driven by a transmission belt.

[0003] After a period of use, the drive belt will loosen, causing slippage between the drive wheel and the drive belt, as well as between the driven wheel and the drive belt. This reduces transmission efficiency and increases wear on the drive belt. Utility Model Content

[0004] This invention addresses the shortcomings of existing transmission belts that lack a tensioning structure after slack. Its primary objective is to provide a tensioning structure for the transmission belt used in the drive of the active roller of a treadmill.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0006] A tensioning structure for a drive belt of a treadmill active roller includes a tensioning wheel assembly, a drive belt assembly, and a tensioning component. A drive wheel is coaxially fixed on the motor shaft of a drive motor, and a driven wheel is coaxially fixed at the end of the active roller. The tensioning wheel assembly is located at the end of the driven wheel away from the drive wheel. The tensioning wheel assembly includes a first tensioning wheel and a second tensioning wheel coaxially fixed. The drive belt assembly includes a first drive belt wound between the drive wheel and the first tensioning wheel, and a second drive belt wound between the second tensioning wheel and the driven wheel. The tensioning component includes a fixed block fixed to the running platform, a slider guided and slidable on the running platform or the fixed block and equipped with a concentric shaft of the tensioning wheel assembly, and an elastic element that drives the slider away from the fixed block.

[0007] By adopting the above solution, after the tensioning wheel assembly is combined with the transmission belt assembly, only the position of the tensioning wheel assembly needs to be changed to achieve synchronous tensioning of the transmission belt assembly without changing the installation position of the drive motor and the drive roller. This ensures that the drive motor can drive the drive roller to rotate in real time. In the tensioning component, the elastic element provides a force to the tensioning wheel assembly to keep the first and second transmission belts in the transmission belt assembly in an elastic tension state. Within a certain slack range of the transmission belt assembly, the elastic force of the elastic element can be used for adaptive tensioning. Compared with the existing technology, this can reduce wear or loosening caused by slack in the transmission belt assembly, thereby reducing its replacement frequency.

[0008] Preferably, an adjustment mechanism is provided between the slider and the fixed block to manually tighten the elastic element when it becomes loose.

[0009] Preferably, the adjustment mechanism includes an adjustment bolt screwed onto the slider, wherein the stud of the adjustment bolt abuts against the end of the fixed block away from the tension wheel assembly.

[0010] Using the above solution, the elasticity of the elastic element decreases after a period of use, and the transmission belt assembly will also loosen with use. At this time, by adjusting the bolt and pushing it towards the fixed block, the tensioning wheel assembly can be driven away from the drive motor and the drive roller, thereby achieving re-tensioning of the synchronous belt assembly. At this time, although the elasticity of the elastic element is damaged, it can still play a certain role in elastic tensioning, providing a continuous tensioning effect within a certain range for the subsequent further loosening of the synchronous belt assembly; the adjusting bolt can also guide the tensioning direction.

[0011] Preferably, the fixed block is hollow inside, and the end of the fixed block near the bolt head of the adjusting bolt is provided with a clearance hole through which the stud of the adjusting bolt can pass. The stud of the adjusting bolt abuts against the inner wall of the fixed block. The elastic element is a spring sleeved on the adjusting bolt, and the two ends of the spring abut against the slider and the inner wall of the fixed block respectively.

[0012] By adopting the above scheme, the space required for the fixing block is reduced, making the structure more compact.

[0013] Preferably, the slider is U-shaped, with mating holes on both sides of the opening for concentric shaft insertion, and a threaded hole for screwing an adjusting bolt at the end of the slider away from the opening.

[0014] By adopting the above scheme, the shape of the slider can not only ensure stable assembly at both ends of the concentric shaft, but also facilitate the assembly of the adjusting bolts, making the whole structure more stable and compact.

[0015] Preferably, the mating hole is a slotted hole that allows the concentric shaft to move axially along the adjusting bolt.

[0016] Using the above scheme, the concentric shaft needs to be inserted into the oblong holes on both sides. Its length must be greater than the distance between the two sides of the slider opening. After setting the oblong holes, it is convenient to assemble the concentric shaft. The adjusting bolt can play a guiding role. The direction of the oblong holes allows the concentric shaft to elastically abut against the end of the oblong hole away from the tension direction under the elastic force of the elastic element. This achieves elastic limit on the concentric shaft after assembly, so that the direction of the concentric shaft's movement is parallel to the tension direction, and the concentric shaft is only affected by the elastic element and does not move arbitrarily.

[0017] Preferably, the fixing block is detachably fixed to the machine compartment of the runway by locking bolts.

[0018] With the above solution, the detachable fixing block facilitates the assembly of the slider, elastic element, and adjusting bolt.

[0019] Preferably, the diameter of the first tensioning wheel is greater than the diameter of the driven wheel, which is greater than the diameter of the second tensioning wheel, which is greater than the diameter of the driving wheel.

[0020] Using the above solution, the drive is more effortless.

[0021] The second objective of this invention is to provide a treadmill, including a running platform, wherein the running platform is equipped with a transmission belt tensioning structure for driving the treadmill's active roller.

[0022] This utility model, by adopting the above technical solution, has significant technical effects:

[0023] 1. A tensioning structure is installed on the running platform to tension the transmission belt assembly for realizing the movement of the active roller. This tensioning structure has a new type of tensioning wheel assembly, transmission belt assembly and tensioning component. Only by changing the position of the tensioning wheel assembly, the first transmission belt and the second transmission belt in the transmission belt assembly can be synchronously tensioned without changing the installation position of the drive motor and the active roller. This ensures that the drive motor can drive the active roller to rotate in real time. The tensioning component uses elastic elements to achieve adaptive tensioning under a certain degree of slack in the transmission belt assembly. Compared with the existing technology, it can reduce the replacement frequency of the transmission belt assembly.

[0024] 2. An adjustment structure is added, using an adjusting bolt to adjust the distance between the end of the slider furthest from the opening and the fixed block. This distance adjustment can further tighten the transmission belt assembly after the slack of the transmission belt assembly exceeds the adjustment range of the elastic element or after the elastic element becomes fatigued and loose, and ensure that the elastic element continues to achieve the function of adaptive elastic tension within a certain range in the future, further reducing the replacement frequency of the transmission belt assembly. Attached Figure Description

[0025] Figure 1 This is an isometric view of a transmission belt tensioning structure for a treadmill active roller drive according to this embodiment;

[0026] Figure 2 This is a partial schematic diagram of the running platform of a treadmill according to this embodiment.

[0027] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Drive motor; 2. Drive wheel; 3. Drive roller; 4. Driven wheel; 5. First transmission belt; 6. Second transmission belt; 7. First tensioning pulley; 8. Second tensioning pulley; 9. Fixing block; 10. Adjusting bolt; 11. Spring; 12. Concentric shaft; 13. Waist-shaped hole; 14. Slider; 15. Running table; 16. Cabin; 17. Reinforcing rib. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] A treadmill, as shown Figures 1-2 As shown, the treadmill includes a running platform 15. The front end and both sides of the running platform 15 are recessed to form a housing 16 for assembling components. The housing 16 on both sides of the running platform 15 is integrally provided with reinforcing ribs 17 to enhance the deformation resistance of the housing 16. The housing 16 is equipped with a drive assembly for driving the active roller 3 to rotate. The drive assembly includes a drive motor 1 and a transmission belt tensioning structure for driving the active roller of the treadmill. The housing of the drive motor 1 is fixed in the housing 16 at the front end of the running platform 15. The transmission belt tensioning structure for driving the active roller of the treadmill includes a tensioning wheel assembly, a transmission belt assembly and a tensioning component. A drive wheel 2 is coaxially fixed on the motor shaft of the drive motor 1. A driven wheel 4 is coaxially fixed at the end of the active roller 3. The tensioning wheel assembly is located in the housing 16 on one side of the running platform 15 and is located at the end of the driven wheel 4 away from the drive wheel 2.

[0030] The tensioning pulley assembly includes a first tensioning pulley 7 and a second tensioning pulley 8 fixed coaxially. The first tensioning pulley 7 and the second tensioning pulley 8 are rotatable on a concentric shaft 12 via bearings. The diameter of the first tensioning pulley 7 is greater than the diameter of the driven pulley 4, which is greater than the diameter of the second tensioning pulley 8, which is greater than the diameter of the drive pulley 2. The transmission belt assembly includes a first transmission belt 5 wound between the drive pulley 2 and the first tensioning pulley 7, and a second transmission belt 6 wound between the second tensioning pulley 8 and the driven pulley 4. The above arrangement makes the drive motor 1 more effortless to drive.

[0031] The tensioning component includes a fixed block 9 that is detachably fixed to the running platform 15 by locking bolts, a slider 14 that slides on the fixed block 9 and is equipped with a concentric shaft 12, and an elastic element that drives the slider 14 away from the fixed block 9. The elastic element is a spring 11. The elastic force of the spring 11 can drive the slider 14 to have an elastic force away from the fixed block 9, so that the tensioning wheel assembly has a tension force in the tensioning direction, thereby realizing the synchronous tensioning of the first transmission belt 5 and the second transmission belt 6.

[0032] An adjustment mechanism is provided between the slider 14 and the fixed block 9 for manual tensioning when the spring 11 is relaxed. The adjustment mechanism includes an adjustment bolt 10 screwed onto the slider 14. The slider 14 is U-shaped. The two sides of the opening of the slider 14 are provided with mating holes for the concentric shaft 12 to be inserted. The mating holes are waist-shaped holes 13 for the concentric shaft 12 to move along the axial direction of the adjustment bolt 10. The end of the slider 14 away from the opening is provided with a threaded hole for screwing onto the adjustment bolt 10. The fixed block 9 is hollow inside. The end of the fixed block 9 near the bolt head of the adjustment bolt 10 is provided with a clearance hole for the stud of the adjustment bolt 10 to pass through. The stud of the adjustment bolt 10 abuts against the inner wall of the fixed block 9. The spring 11 is sleeved on the adjustment bolt 10 and its two ends are elastically abutting against the inner walls of the slider 14 and the fixed block 9, respectively.

[0033] The principle of the adjustment structure is as follows: after a period of use, the spring 11 will become loose and its elasticity will decrease. The transmission belt assembly will also loosen synchronously with the use. At this time, by pushing the adjusting bolt 10 into the fixed block 9, the tensioning wheel assembly can be driven away from the drive motor 1 and the drive roller 3, thereby achieving the re-tensioning of the synchronous belt assembly. At this time, although the spring 11 has lost its elasticity, it can still play a certain role in elastic tensioning, providing a continuous elastic tensioning effect within a certain range for the further loosening of the synchronous belt assembly. The adjusting bolt 10 can also guide the tensioning direction.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

[0035] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A transmission belt tensioning structure for driving the active roller of a treadmill, characterized in that: The device includes a tensioning wheel assembly, a transmission belt assembly, and a tensioning component. A drive wheel (2) is coaxially fixed on the motor shaft of the drive motor (1), and a driven wheel (4) is coaxially fixed at the end of the drive roller (3). The tensioning wheel assembly is located at the end of the driven wheel (4) away from the drive wheel (2). The tensioning wheel assembly includes a first tensioning wheel (7) and a second tensioning wheel (8) coaxially fixed. The transmission belt assembly includes a first transmission belt (5) wound between the drive wheel (2) and the first tensioning wheel (7) and a second transmission belt (6) wound between the second tensioning wheel (8) and the driven wheel (4). The tensioning component includes a fixed block (9) fixed to the running platform (15), a slider (14) that slides on the running platform (15) or the fixed block (9) and is equipped with a concentric shaft (12) of the tensioning wheel assembly, and an elastic element that drives the slider (14) away from the fixed block (9).

2. The transmission belt tensioning structure for driving the active roller of a treadmill according to claim 1, characterized in that: An adjustment mechanism is provided between the slider (14) and the fixed block (9) for manually tightening the elastic element when it becomes loose.

3. The belt tensioning structure for driving the active roller of a treadmill according to claim 2, characterized in that: The adjustment mechanism includes an adjustment bolt (10) screwed onto the slider (14), and the stud of the adjustment bolt (10) abuts against the end of the fixed block (9) away from the tension wheel assembly.

4. The transmission belt tensioning structure for driving the active roller of a treadmill according to claim 3, characterized in that: The fixed block (9) is hollow inside. One end of the fixed block (9) near the bolt head of the adjusting bolt (10) is provided with a clearance hole through which the stud of the adjusting bolt (10) can pass. The stud of the adjusting bolt (10) abuts against the inner wall of the fixed block (9). The elastic element is a spring (11) sleeved on the adjusting bolt (10). The two ends of the spring (11) abut against the slider (14) and the inner wall of the fixed block (9) respectively.

5. A transmission belt tensioning structure for driving the active roller of a treadmill according to claim 3 or 4, characterized in that: The slider (14) is U-shaped. The two sides of the opening of the slider (14) are provided with mating holes for the concentric shaft (12) to be inserted. The end of the slider (14) away from the opening is provided with a threaded hole for screwing with the adjusting bolt (10).

6. The transmission belt tensioning structure for driving the active roller of a treadmill according to claim 5, characterized in that: The mating hole is a waist-shaped hole (13) for the concentric shaft (12) to move axially along the adjusting bolt (10).

7. The belt tensioning structure for driving the active roller of a treadmill according to claim 1, characterized in that: The fixing block (9) is detachably fixed to the cabin (16) of the runway (15) by locking bolts.

8. The transmission belt tensioning structure for driving the active roller of a treadmill according to claim 1, characterized in that: The diameter of the first tensioning wheel (7) > the diameter of the driven wheel (4) > the diameter of the second tensioning wheel (8) > the diameter of the driving wheel (2).

9. A treadmill, comprising a running platform (15), characterized in that, The machine compartment (16) of the treadmill (15) is equipped with a transmission belt tensioning structure for driving the active roller of the treadmill as described in any one of claims 1-8.

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