Belt self-adjusting structure of a treadmill

Abstract

The utility model relates to a kind of belt self-adjusting structure of treadmill, it is respectively connected with base through tensioning assembly and self-adapting component in the both ends of front roller group, when the belt is slack, the elastic force of the tensioning spring of tensioning assembly pushes down the pressing plate, the pressing plate moves along the first inclined plane downward and to the direction of mounting groove, the push block on the pressing plate will push the driving end of front roller group to move in the direction of far from driving device, at this time, the driven end of front roller group will also adaptively move along fixed shaft, to expand the distance between front roller group and driving device, so that the belt keeps tight. Therefore, the utility model can automatically adjust belt tension.

Description

Technical Field

[0001] This utility model relates to the field of treadmill technology, specifically to a self-adjusting belt structure for a treadmill. Background Technology

[0002] A treadmill is a type of indoor fitness equipment. A typical treadmill consists of a base, a belt, and a drive mechanism. The drive mechanism is located on the base, the belt is mounted on the drive mechanism, and the handrails are also mounted on the base. During exercise, the drive mechanism is activated, causing the belt to rotate, and the user runs on the belt.

[0003] A common problem with treadmills is that the belt loosens after a period of use, affecting the treadmill's performance. To address this, treadmills have added tension adjustment mechanisms, but current mechanisms require manual adjustment by the user, which is rather cumbersome. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a self-adjusting structure for the belt of a treadmill, which can automatically adjust when the treadmill belt becomes loose.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A self-adjusting belt structure for a treadmill includes a running belt, a base, and a drive device, a front roller assembly, and a rear roller assembly mounted on the base. The running belt is mounted on the base via the front roller assembly and the rear roller assembly. The active end of the front roller assembly is connected to the drive device via a belt. The active end of the front roller assembly is mounted on the base via a tensioning component. The driven end of the front roller assembly is mounted on the base via an adaptive component. The tensioning assembly includes a fixed base, a pressure plate, a fixed rod, and a tension spring. The fixed base is fixed to the base and has an adjustment groove. One side wall of the adjustment groove is a first inclined surface, and the lower part of the other side wall of the adjustment groove is recessed away from the first inclined surface to form a mounting groove for placing the active end of the front roller assembly. The pressure plate is movably fitted in the adjustment groove and has a second inclined surface that mates with the first inclined surface. The side of the pressure plate away from the second inclined surface has a push block that can extend into the mounting groove, and the push block presses against the active end of the front roller assembly. The pressure plate has an elongated hole that passes through both the upper and lower ends of the pressure plate. The fixed rod passes through the elongated hole of the tension spring and the pressure plate in sequence and is connected to the fixed base. The upper end of the tension spring abuts against the upper end of the fixed rod, and the lower end of the tension spring abuts against the upper end face of the pressure plate. The adaptive component includes a fixed shaft, and the driven end of the front roller assembly is provided with a shaft hole. The fixed shaft passes through the shaft hole of the driven end and is fixed on the base.

[0006] The bottom of the mounting groove is lower than the bottom of the adjusting groove, and a step is formed between the mounting groove and the adjusting groove to limit the active end of the front roller assembly.

[0007] The fixing base has a fixing hole at its bottom, and the fixing rod is threadedly connected to the fixing base at the fixing hole.

[0008] The front roller assembly includes a spindle, a front roller, and a pulley. The front roller is sleeved on the spindle, and both ends of the front roller are connected to the spindle via bearings. The driving end of the spindle is fitted into the mounting groove of the fixed seat, and the driven end of the spindle is provided with the shaft hole. The pulley is fixed to the driving end of the front roller and engages with the belt.

[0009] The adaptive component also includes a fixing plate fixed on the base. The fixing plate includes two fixing parts and a connecting part. The two fixing parts are respectively connected to the two ends of the connecting part. The fixing shaft is located between the two fixing parts, and the two ends of the fixing shaft pass through the fixing parts. The distance between the two fixing parts is greater than the diameter of the spindle.

[0010] The diameter of the shaft hole is adapted to the outer diameter of the fixed shaft, so that the mandrel can move along the fixed shaft.

[0011] With the above solution, this invention connects the two ends of the front roller assembly to the base via a tensioning component and an adaptive component, respectively. When the belt slacks, the tension spring of the tensioning component pushes the pressure plate downwards. The pressure plate moves downwards along the first inclined surface and towards the mounting groove. The push block on the pressure plate then pushes the driving end of the front roller assembly away from the drive device. At this time, the driven end of the front roller assembly also moves adaptively along the fixed axis, thereby increasing the distance between the front roller assembly and the drive device, keeping the belt taut. Therefore, this invention can automatically adjust the belt tension. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the treadmill structure of this utility model; Figure 2 This is a schematic diagram of the treadmill structure of this utility model (some structures are omitted). Figure 3 This is a schematic diagram of a belt self-adjusting structure; Figure 4 This is a schematic diagram of the tensioning assembly. Figure 5 This is a schematic diagram of the structure of the fixed base; Figure 6 This is a schematic diagram of the pressure plate structure; Figure 7 This is a schematic diagram of the adaptive component.

[0013] Label Explanation: 11. Running belt; 12. Base; 13. Drive unit; 14. Belt; Front roller assembly 20; Front roller 21; Pulley 22; Spindle 23; Tensioning assembly 30; fixing base 31; adjusting groove 311; first inclined surface 312; fixing hole 313; mounting groove 314; pressure plate 32; second inclined surface 321; push block 322; oblong hole 323; fixing rod 33; tension spring 34; Adaptive component 40; fixing plate 41; fixing part 411; connecting part 412; fixing shaft 42. Detailed Implementation

[0014] like Figure 1-3 As shown, this utility model discloses a self-adjusting belt structure for a treadmill, comprising a running belt 11, a base 12, and a drive device 13, a front roller assembly 20, and a rear roller assembly mounted on the base 12. The running belt 11 is mounted on the base 12 via the front roller assembly 20 and the rear roller assembly. The active end of the front roller assembly 20 is connected to the drive device 13 via a belt 14. The active end of the front roller assembly 20 is mounted on the base 12 via a tensioning component 30, and the driven end of the front roller assembly 20 is mounted on the base 12 via an adaptive component 40. When the belt 14 becomes loose after prolonged use, the tensioning component 30 and the adaptive component 40 can automatically adjust the position of the front roller assembly 20, thereby increasing the distance between the front roller assembly 20 and the drive assembly, ensuring that the belt 14 remains taut at all times.

[0015] like Figure 4-6As shown, in this embodiment, the tensioning assembly 30 includes a fixed base 31, a pressure plate 32, a fixed rod 33, and a tension spring 34. The fixed base 31 is fixed to the base 12 and has an adjustment groove 311. One side wall of the adjustment groove 311 is a first inclined surface, and the lower part of the other side wall of the adjustment groove 311 is recessed away from the first inclined surface 312 to form a mounting groove 314 for placing the active end of the front roller assembly 20. The pressure plate 32 is movably fitted in the adjustment groove 311 and has a second inclined surface 321 that cooperates with the first inclined surface 312. On the side of the pressure plate 32 away from the second inclined surface 321, there is a push block 322 that can extend into the mounting groove 314 and presses against the active end of the front roller assembly 20. The pressure plate 32 has an elongated hole 323 that passes through both the upper and lower ends of the pressure plate 32. The fixing rod 33 passes through the elongated hole 323 of the tension spring 34 and the pressure plate 32 in sequence and is connected to the fixing seat 31. The upper end of the tension spring 34 abuts against the upper end of the fixing rod 33, and the lower end of the tension spring 34 abuts against the upper end face of the pressure plate 32. The fixing rod 33 fixes the position of the tension spring 34 and the pressure plate 32, and the tension spring 34 is always kept in a compressed state, thereby pushing the pressure plate 32 downward, so that the push block 322 of the pressure plate 32 always abuts against the active end of the front roller assembly 20, thereby ensuring that the belt 14 remains taut. When the belt 14 slackens, the elastic force of the tension spring 34 pushes the pressure plate 32 downward. The pressure plate 32 moves downward along the first inclined surface 312 and toward the mounting groove 314. The push block 322 on the pressure plate 32 pushes the active end of the front roller assembly 20 away from the drive device 13, thereby increasing the distance between the front roller assembly 20 and the drive device 13, so that the belt 14 remains taut.

[0016] like Figure 7 As shown, the adaptive component 40 includes a fixed shaft 42 and a fixed plate 41. The fixed plate 41 is fixed on the base 12. The driven end of the front roller assembly 20 is provided with a shaft hole. The fixed shaft 42 passes through the shaft hole of the driven end and is fixed on the fixed plate 41. The diameter of the shaft hole is adapted to the outer diameter of the fixed shaft 42. The driven end of the front roller assembly 20 can move along the fixed shaft 42. Specifically, when the pressure plate 32 of the tensioning component 30 pushes the driving end of the front roller assembly 20 to move, the driven end of the front roller assembly 20 will also move adaptively along the fixed shaft 42.

[0017] In this embodiment, the bottom of the fixing base 31 has a fixing hole 313, and the fixing rod 33 is threadedly connected to the fixing base 31 at the fixing hole 313. The fixing base 31 and the fixing plate 41 are directly welded to the base 12. Of course, the fixing base 31 and the fixing plate 41 can also be fixed to the base 12 in other ways.

[0018] The bottom of the mounting groove 314 of the fixed seat 31 is lower than the bottom of the adjustment groove 311, and a step is formed between the mounting groove 314 and the adjustment groove 311 to limit the active end of the front roller assembly 20.

[0019] like Figure 3-7 As shown, in this embodiment, the front roller assembly 20 includes a spindle 23, a front roller 21, and a pulley 22. The front roller 21 is sleeved on the spindle 23, and both ends of the front roller 21 are connected to the spindle 23 via bearings. The driving end of the spindle 23 is fitted into the mounting groove 314 of the fixed seat 31, and the driven end of the spindle 23 is provided with the aforementioned shaft hole. The pulley 22 is fixed to the driving end of the front roller 21 and cooperates with the belt 14. The entire front roller assembly 20 is fixed in position by the spindle 23, and the belt 14 drives the front roller 21 to rotate, thereby driving the running belt 11 to rotate.

[0020] In this embodiment, the fixing plate 41 includes two fixing parts 411 and a connecting part 412. The two fixing parts 411 are respectively connected to the two ends of the connecting part 412. The fixing shaft 42 is located between the two fixing parts 411, and the two ends of the fixing shaft 42 pass through the fixing parts 411. The distance between the two fixing parts 411 is greater than the diameter of the spindle 23, and the spindle 23 can move along the fixing shaft 42.

[0021] In this embodiment, the structures of the base 12, the rear roller assembly, and the drive device 13 all adopt existing technologies, so this case will not elaborate on them.

[0022] Currently available treadmills all have a running belt tension adjustment mechanism 11. During use, users will periodically or irregularly adjust the tension of the running belt 11 through this mechanism. Therefore, after the belt 14 automatically adjusts its tension using the self-adjusting belt structure of this invention, the user can adaptively adjust the tension of the running belt 11 using the existing running belt tension adjustment mechanism to ensure the normal operation of the treadmill.

[0023] In summary, this invention connects the front roller assembly 20 to the base 12 at both ends via a tensioning assembly 30 and an adaptive assembly 40, respectively. When the belt 14 slacks, the tension spring 34 of the tensioning assembly 30 pushes the pressure plate 32 downwards. The pressure plate 32 moves downwards along the first inclined surface 312 and toward the mounting groove 314. The push block 322 on the pressure plate 32 then pushes the driving end of the front roller assembly 20 away from the drive device 13. At this time, the driven end of the front roller assembly 20 also moves adaptively along the fixed shaft 42, thereby increasing the distance between the front roller assembly 20 and the drive device 13, keeping the belt 14 taut. Therefore, this invention can automatically adjust the tension of the belt 14.

[0024] The above description is merely an embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A self-adjusting belt structure for a treadmill, comprising a running belt, a base, and a drive device, a front roller assembly, and a rear roller assembly mounted on the base, wherein the running belt is mounted on the base via the front roller assembly and the rear roller assembly, and the active end of the front roller assembly is connected to the drive device via a belt, characterized in that: The active end of the front roller assembly is mounted on the base via a tensioning component, and the driven end of the front roller assembly is mounted on the base via an adaptive component. The tensioning assembly includes a fixed base, a pressure plate, a fixed rod, and a tension spring. The fixed base is fixed to the base and has an adjustment groove. One side wall of the adjustment groove is a first inclined surface, and the lower part of the other side wall of the adjustment groove is recessed away from the first inclined surface to form a mounting groove for placing the active end of the front roller assembly. The pressure plate is movably fitted in the adjustment groove and has a second inclined surface that mates with the first inclined surface. The side of the pressure plate away from the second inclined surface has a push block that can extend into the mounting groove, and the push block presses against the active end of the front roller assembly. The pressure plate has an elongated hole that passes through both the upper and lower ends of the pressure plate. The fixed rod passes through the elongated hole of the tension spring and the pressure plate in sequence and is connected to the fixed base. The upper end of the tension spring abuts against the upper end of the fixed rod, and the lower end of the tension spring abuts against the upper end face of the pressure plate. The adaptive component includes a fixed shaft, and the driven end of the front roller assembly is provided with a shaft hole. The fixed shaft passes through the shaft hole of the driven end and is fixed on the base.

2. The self-adjusting belt structure for a treadmill according to claim 1, characterized in that: The bottom of the mounting groove is lower than the bottom of the adjusting groove, and a step is formed between the mounting groove and the adjusting groove to limit the active end of the front roller assembly.

3. The self-adjusting belt structure for a treadmill according to claim 1, characterized in that: The fixing base has a fixing hole at its bottom, and the fixing rod is threadedly connected to the fixing base at the fixing hole.

4. The self-adjusting belt structure for a treadmill according to claim 1, characterized in that: The front roller assembly includes a spindle, a front roller, and a pulley. The front roller is sleeved on the spindle, and both ends of the front roller are connected to the spindle via bearings. The driving end of the spindle is fitted into the mounting groove of the fixed seat, and the driven end of the spindle is provided with the shaft hole. The pulley is fixed to the driving end of the front roller and engages with the belt.

5. The self-adjusting belt structure for a treadmill according to claim 4, characterized in that: The adaptive component also includes a fixing plate fixed on the base. The fixing plate includes two fixing parts and a connecting part. The two fixing parts are respectively connected to the two ends of the connecting part. The fixing shaft is located between the two fixing parts, and the two ends of the fixing shaft pass through the fixing parts. The distance between the two fixing parts is greater than the diameter of the spindle.

6. The self-adjusting belt structure for a treadmill according to claim 4, characterized in that: The diameter of the shaft hole is adapted to the outer diameter of the fixed shaft, so that the mandrel can move along the fixed shaft.

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