One-way transmission structure on running machine

Abstract

The utility model relates to the field of treadmill transmission structures, in particular to a one-way transmission structure on a treadmill, which comprises a wheel component rotationally arranged on a frame and connected with a runway. A synchronizing wheel is connected to the wheel assembly, a one-way limiting base is fixedly connected to the portion, beside the synchronizing wheel, of the rack, and the one-way limiting base is provided with an inclined face close to the wheel face of the synchronizing wheel. The synchronous wheel further comprises a friction rod, the friction rod can enter the inclined face, and the diameter of the friction rod is larger than the minimum gap between the inclined face and the wheel face of the synchronous wheel. Only when the synchronizing wheel rotates clockwise or anticlockwise and presses the friction rod to the minimum gap, the friction rod limits rotation of the synchronizing wheel. The scheme has the advantages of being simple in structure, low in manufacturing cost, high in reliability, strong in adaptability, not prone to clamping stagnation or failure, and beneficial to light weight and compact design of products.

Description

Technical Field

[0001] This utility model relates to the field of treadmill transmission structure, and more particularly to a unidirectional transmission structure on a treadmill. Background Technology

[0002] Treadmills are primarily designed to simulate outdoor running, following the natural forward-moving motion of everyday running. Therefore, they are designed with a single forward (unidirectional) drive mechanism. Unidirectional drive structures are relatively easier to design and manufacture, such as the motor's installation layout and the direction of the drive belt. Planning in a unidirectional manner makes the entire mechanical system simpler, more efficient, and lower in cost. Unidirectional drive ensures that the treadmill experiences relatively uniform and stable forces during operation, making it easier for engineers to predict wear and load conditions during use, thus ensuring safety and reducing the probability of malfunctions. Frequent bidirectional drive switching, due to the different forces in different directions, may lead to uneven wear of components and loosening of connections, which is detrimental to long-term stable use. For typical home fitness or general gym settings, most users primarily need to exercise in the normal running direction, and unidirectional drive is sufficient for basic daily aerobic exercise needs. Therefore, unidirectional drive is quite common in such application scenarios.

[0003] Traditional electric treadmills use a motor to drive a running belt, passively moving the user at different speeds or inclines. The running belt is controlled by the motor, achieving unidirectional transmission. The biggest characteristic of a non-motorized treadmill is that it requires no electricity and is controlled solely by the user's own body force, making it a green and low-carbon treadmill. The biggest difference between it and a traditional treadmill lies in the driving mode: traditional treadmills use a motor to drive the running belt, resulting in passive running, while non-motorized treadmills require the user to actively exert force while running.

[0004] However, in non-motorized treadmills, to prevent uneven force distribution during exercise from causing the running belt to change direction and resulting in slips and falls, a unidirectional drive structure is required. The user applies power to the front and rear drive wheels by moving the running belt backward, thus necessitating a mechanism that ensures unidirectional movement of the running belt. Existing unidirectional drive structures are often complex, costly to manufacture, and lack reliability. Some simple unidirectional drive structures may not be suitable for different usage scenarios and are prone to jamming or failure. Furthermore, existing unidirectional drive structures may increase the overall weight and size of the treadmill, hindering lightweight and compact design.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0006] To address the aforementioned issues, the present invention aims to provide a unidirectional transmission structure for treadmills, which has the advantages of simple structure, low manufacturing cost, high reliability, strong adaptability, resistance to jamming or failure, and facilitates lightweight and compact product design.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A unidirectional transmission structure for a treadmill, the technical solution of which includes a component rotatably mounted on the frame and connected to the running track.

[0009] A wheel assembly; a synchronous pulley is connected to the wheel assembly, and a one-way limiting base is fixed to the frame next to the synchronous pulley. The one-way limiting base has an inclined surface adjacent to the wheel surface of the synchronous pulley; it also includes a friction rod, which can enter the inclined surface, and the diameter of the friction rod is larger than the minimum gap between the inclined surface and the wheel surface of the synchronous pulley; the friction rod restricts the rotation of the synchronous pulley only when the synchronous pulley rotates clockwise or counterclockwise and presses the friction rod against the minimum gap.

[0010] Furthermore, this application also proposes that the friction rod is rolled on the inclined surface of the unidirectional limiting base, and the friction rod is always in contact with the wheel surface of the synchronous wheel under the action of gravity; when the synchronous wheel rotates clockwise and counterclockwise, it provides frictional force to the friction rod in the up and down direction along the inclined surface.

[0011] Furthermore, this application also proposes that the unidirectional limiting base includes two side plates on both sides of the inclined surface, the upper ends of the two side plates extend beyond the inclined surface and form a groove between them, the groove having the inclined surface as its bottom surface; the friction rod is placed on the inclined surface within the groove, and when the synchronous wheel rotates, part of its wheel surface passes through the groove.

[0012] Furthermore, this application also proposes that the unidirectional limiting base includes a sealing cap disposed above the inclined surface, the sealing cap being connected to the two side plates.

[0013] Furthermore, this application also proposes a friction rod support, the center of which is movably sleeved on the shaft of the synchronous pulley; the friction rod is rotatably mounted on the friction rod support, and when the synchronous pulley rotates, it can drive the friction rod support to rotate based on friction or magnetic force, so that the friction rod on the friction rod support can move on the inclined surface of the unidirectional limiting base; the friction rod restricts the rotation of the synchronous pulley only when the synchronous pulley rotates and causes the friction rod to enter the inclined surface and press against the minimum gap.

[0014] Furthermore, this application also proposes that the friction rod support includes a U-shaped support with a magnet fixedly connected to it; the wheel surface of the synchronous pulley is located within the U-shaped opening of the U-shaped support.

[0015] Furthermore, this application also proposes that the upper end of the U-shaped bracket is provided with a U-shaped clamping groove, and the U-shaped clamping groove is provided with mounting holes on both sides of the U-shaped bracket; magnets are embedded in the mounting holes on both sides; and U-shaped clips are embedded in the U-shaped clamping groove of the U-shaped bracket, with the U-shaped clips covering the magnets in the mounting holes.

[0016] Furthermore, this application also proposes that the friction rod support is L-shaped, with a bushing at the center of the friction rod support, a U-shaped support connected to the first end of the friction rod support, and a rocker arm connected to the second end of the friction rod support. The friction rod is rotatably mounted at the end of the rocker arm. When the bushing of the friction rod support is movably fitted onto the shaft of the synchronous wheel, the second end of the friction rod support extends beyond the edge of the synchronous wheel, and the friction rod is located outside the wheel surface of the synchronous wheel. When the synchronous wheel rotates, it drives the friction rod to move on the inclined surface of the one-way limiting base, thereby causing the friction rod to move closer to or further away from the wheel surface of the synchronous wheel.

[0017] Furthermore, this application also proposes that the unidirectional limiting base includes a base body and an inclined surface disposed on the base body, with a lower stop block disposed at the lower end of the inclined surface, so that when the friction rod is engaged in the minimum gap, the lower end of the friction rod is supported by the lower stop block.

[0018] Furthermore, this application also proposes that an upper stop block be provided on the base body above the inclined plane, the upper stop block being used to limit the rotation angle of the friction rod support.

[0019] As can be seen from the above, the unidirectional transmission structure for a treadmill provided in this application includes a structure rotatably mounted on the frame and moving in parallel with the running track.

[0020] The system includes a wheel assembly connected to a track; a synchronous pulley is connected to the wheel assembly, and a one-way limiting base is fixed to a frame next to the synchronous pulley. The one-way limiting base has an inclined surface adjacent to the wheel surface of the synchronous pulley. It also includes a friction rod that can enter the inclined surface, and the diameter of the friction rod is larger than the minimum gap between the inclined surface and the wheel surface of the synchronous pulley. The friction rod restricts the rotation of the synchronous pulley only when the synchronous pulley rotates clockwise or counterclockwise and presses the friction rod against the minimum gap. By setting the one-way limiting base and the friction rod, a simple and effective one-way transmission is achieved, solving the problems of complex structure, high cost, and insufficient reliability of existing one-way transmission technologies. It has the advantages of simple structure, low manufacturing cost, high reliability, strong adaptability, resistance to jamming or failure, and is conducive to lightweight and compact product design. Attached Figure Description

[0021] Figure 1 The exploded view of the unidirectional transmission structure described in Embodiment 1 is provided for this application.

[0022] Figure 2The part provided for this application is a partial schematic diagram of the unidirectional transmission structure described in Embodiment 1.

[0023] Figure 3 The exploded view of the unidirectional transmission structure described in Embodiment 2 is provided for this application.

[0024] Figure 4 The part provided for this application is a partial schematic diagram of the unidirectional transmission structure described in Embodiment 2.

[0025] Figure 5 This is an exploded view of the friction rod support in Example 2.

[0026] Figure 6 This is a schematic diagram of the unidirectional limiting base in Example 2. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the above terms according to the specific circumstances.

[0031] The specific meaning in the context of utility model.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Example 1:

[0034] like Figure 1 and 2As shown, this embodiment proposes a unidirectional transmission structure for a treadmill, including a wheel assembly 2 rotatably mounted on a frame 1 and connected to the running track; a synchronous wheel 3 is connected to the wheel assembly 2, and a unidirectional limiting base 4 is fixed to the frame next to the synchronous wheel 3. The unidirectional limiting base 4 has an inclined surface 41 adjacent to the wheel surface of the synchronous wheel 3; it also includes a friction rod 50, which is disposed on the inclined surface 41, and the diameter of the friction rod 50 is larger than the minimum gap between the inclined surface 41 and the wheel surface of the synchronous wheel 3; the friction rod 50 restricts the rotation of the synchronous wheel 3 only when the synchronous wheel 3 rotates clockwise or counterclockwise and presses the friction rod 50 against the minimum gap. The friction rod 50 can be designed as a cylinder to increase the contact area with the inclined surface 41, thereby improving friction. Furthermore, the material of the friction rod 50 can be selected as a wear-resistant rubber or polyurethane to ensure stability under long-term use. Specifically, the friction rod 50 can be fixed to the inclined surface 41 by a spring or magnetic device, so that it can automatically adjust its position when the synchronous wheel 3 rotates, ensuring that it is always in contact with the wheel surface of the synchronous wheel 3. As a preferred embodiment, the friction rod 50 can be designed to be replaceable, so that it can be easily replaced after wear. This technical solution ensures the normal operation of the treadmill through the connection between the wheel assembly 2 and the track; the synchronous wheel 3 is connected to the wheel assembly 2, so that the synchronous wheel 3 can move with the wheel assembly 2 and the track; the one-way limiting base 4 is fixed to the frame, and its inclined surface 41 is close to the wheel surface of the synchronous wheel 3, which is used to limit the rotation direction of the synchronous wheel 3; the friction rod 50 is set on the inclined surface 41, and its diameter is larger than the minimum gap between the inclined surface 41 and the wheel surface of the synchronous wheel 3. Thus, when the friction force of the synchronous wheel 3 on the friction rod 50 causes the friction rod 50 to press against the minimum gap, the friction rod 50 will be stuck at the minimum gap position, thereby limiting the rotation of the synchronous wheel 3. These technical features work together to restrict the rotation of the synchronous wheel 3 through the interaction between the friction rod 50 and the inclined plane 41, thereby achieving unidirectional transmission. On the treadmill, this translates to the track moving only backward. Compared to existing technologies, this solution offers advantages such as simple structure, ease of manufacturing, and maintenance. The interaction between the friction rod 50 and the inclined plane 41 effectively restricts the rotation direction of the synchronous wheel 3, ensuring the unidirectional transmission function of the treadmill and thus improving its safety and stability.

[0035] In a specific implementation, the friction rod 50 is rolled on the inclined surface 41 of the one-way limiting base 4, and the friction rod 50 is always in contact with the wheel surface of the synchronous pulley 3 under the action of gravity. When the synchronous pulley 3 rotates clockwise and counterclockwise, it provides frictional forces to the friction rod 50 in the vertical direction along the inclined surface 41, respectively. Specifically, the design of the friction rod 50 allows it to roll freely on the inclined surface 41 and also ensures that the friction rod 50 can automatically adjust its position according to the rotation direction of the synchronous pulley 3. For example, when the synchronous pulley 3 rotates counterclockwise, the friction rod 50 will be subjected to an upward frictional force along the inclined surface 41. This force helps the friction rod 50 maintain contact with the wheel surface of the synchronous pulley 3 and prevents the friction rod 50 from slipping off due to gravity. Conversely, when the synchronous pulley 3 rotates clockwise, the friction rod 50 will be subjected to a downward frictional force along the inclined surface 41. This force helps the friction rod 50 to remain stably on the inclined surface 41, thereby limiting the rotation of the synchronous pulley 3. Furthermore, the angle of the inclined plane 41 and the diameter of the friction rod 50 can be adjusted according to actual application requirements to ensure that the friction rod 50 can work stably under different operating conditions. Therefore, the technical solution of this application effectively solves the technical problem of the friction rod 50 rolling stably on the inclined plane 41 of the unidirectional limiting base 4 and maintaining contact with the wheel surface of the synchronous wheel 3 by optimizing the design and material selection of the friction rod 50. Compared with the prior art, this solution not only simplifies the unidirectional limiting structure but also improves the reliability and operating efficiency of the system, demonstrating significant practical advantages.

[0036] In the specific design, the unidirectional limiting base 4 includes two side plates 42 on both sides of the inclined plane 41. The upper ends of the two side plates 42 extend beyond the inclined plane 41 and form a groove 40 between them, with the inclined plane 41 as the bottom surface of the groove 40. The friction rod 50 is placed on the inclined plane 41 within the groove 40, and when the synchronous wheel 3 rotates, part of its wheel surface passes through the groove 40. Specifically, the design of the groove 40 allows the friction rod 50 to be stably placed on the inclined plane 41, preventing the friction rod 50 from shifting or falling off when the synchronous wheel 3 rotates. The bottom surface of the groove 40 is the inclined plane 41, and the friction rod 50 is always in contact with the wheel surface of the synchronous wheel 3 under the action of gravity. When the synchronous wheel 3 rotates, part of its wheel surface passes through the groove 40, and the friction rod 50 contacts the wheel surface of the synchronous wheel 3, thereby effectively limiting its rotation when the synchronous wheel 3 rotates. Through the design of the groove 40, the position of the friction rod 50 on the inclined plane 41 is more stable, ensuring the reliability and stability of the unidirectional transmission structure. In a preferred embodiment, the width of the groove 40 can be slightly larger than the diameter of the friction rod 50, allowing the friction rod 50 to roll freely within the groove 40 without becoming too loose. The upper end of the side plate 42 extends beyond the inclined surface 41, further preventing the friction rod 50 from falling out of the groove 40 when the synchronous wheel 3 rotates. Furthermore, the depth of the groove 40 can be adjusted according to actual needs to ensure sufficient friction when the friction rod 50 contacts the wheel surface of the synchronous wheel 3. Thus, the technical solution of this application, through the design of the groove 40, ensures the stable placement of the friction rod 50 on the inclined surface 41 and effectively restricts its rotation when the synchronous wheel 3 rotates. Compared with the prior art, this solution is not only simple in structure but also significantly improves the reliability and stability of the unidirectional transmission structure, avoiding the problem of the friction rod 50 shifting or falling off when the synchronous wheel 3 rotates.

[0037] Furthermore, the one-way limiting base 4 includes a sealing cap 43 disposed above the inclined surface 41, which is connected to the two side plates 42. The sealing cap 43 can be implemented in various forms. For example, the sealing cap 43 can be a flat plate structure covering the inclined surface 41 and fixed to the two side plates 42 by bolts or welding. The sealing cap 43 can also be an arc-shaped structure matching the shape of the inclined surface 41 to better restrict the movement of the friction rod 50. In addition, the material of the sealing cap 43 can be high-strength metal or wear-resistant plastic to ensure its stability and durability during long-term use. The design of the sealing cap 43 can also include anti-slip textures or protrusions to increase the friction between it and the friction rod 50, further preventing the friction rod 50 from falling off. This technical solution, through the design of the sealing cap 43, effectively solves the technical problem of the friction rod 50 potentially falling off or becoming unstable during movement. The sealing cap 43 is connected to the two side plates 42, forming a closed groove 40 structure, which allows the friction rod 50 to be stably held within the groove 40 when the synchronous wheel 3 rotates. The presence of the sealing cap 43 not only prevents the friction rod 50 from falling out of the groove 40, but also ensures the stability of the friction rod 50's position on the inclined surface 41, thereby guaranteeing the normal operation of the unidirectional transmission structure. Compared with existing technologies, this solution significantly improves the reliability and stability of the unidirectional limiting base 4 through simple structural improvements, avoiding transmission failure caused by the friction rod 50 falling out or being unstable in position. The operational effects of the above solution are as follows:

[0038] When the athlete moves, the running belt moves counterclockwise, causing the rear wheel assembly 2 to rotate counterclockwise. At the same time, the synchronous wheel 3 on the rear wheel assembly 2 receives an upward driving force and begins to move counterclockwise. Simultaneously, it provides an upward frictional force to the friction rod 50 in contact with it. Under the action of the frictional force, the friction rod 50 overcomes its own weight and begins to move clockwise. However, due to the influence of its own weight, it moves back and forth on the inclined surface 41 of the friction rod 50 placement structure, making intermittent contact with the surface of the synchronous wheel 3. Therefore, the downward frictional force generated by the friction rod 50 on the wheel is almost negligible and has no effect on hindering the counterclockwise movement of the running belt.

[0039] When the running belt moves clockwise, the rear wheel assembly 2 rotates clockwise, and at the same time, the wheel on the rear synchronous wheel 3 receives a downward driving force and begins to move clockwise. The friction rod 50 in contact with it generates a downward frictional force. Under the action of friction and gravity, the friction rod 50 begins to move counterclockwise and moves obliquely downward on the inclined surface 41 of the one-way limiting base 4, pressing against the synchronous wheel 3. The upward reverse frictional force generated by the friction rod 50 on the synchronous wheel 3, under the action of pressing and reverse friction, prevents the synchronous wheel 3 and the wheel assembly 2 from continuing to move clockwise, thereby achieving the effect of one-way transmission of the running belt.

[0040] Example 2:

[0041] like Figures 3-6 As shown, this embodiment proposes a one-way transmission structure for a treadmill, including a wheel assembly 2 rotatably mounted on a frame 1 and connected to the running track; a synchronous wheel 3 is connected to the wheel assembly 2, and a one-way limiting base 4 is fixed to the frame next to the synchronous wheel 3. The one-way limiting base 4 has an inclined surface 41 adjacent to the wheel surface of the synchronous wheel 3. The difference between this embodiment and embodiment 1 is that the one-way transmission structure in this embodiment also includes a friction rod support 5, the center of which is movably sleeved on the shaft of the synchronous wheel 3; a friction rod 50 is rotatably mounted on the friction rod support 5, and when the synchronous wheel 3 rotates, it can drive the friction rod support 5 to rotate based on friction or magnetic force, so that the friction rod 50 on the friction rod support 5 can move on the inclined surface 41 of the one-way limiting base 4; the friction rod 50 restricts the rotation of the synchronous wheel 3 only when the rotation of the synchronous wheel 3 causes the friction rod 50 to press against the minimum gap on the inclined surface 41. Specifically, the center of the friction rod support 5 is movably sleeved on the shaft of the synchronous wheel 3, which means that the friction rod support 5 can rotate around the shaft. The friction rod 50 is rotatably mounted on the friction rod support 5, allowing it to move as the support rotates. When the synchronous wheel 3 rotates, it drives the friction rod support 5 to rotate via friction or magnetic force, causing the friction rod 50 to move on the inclined surface 41 of the one-way limiting base 4. When the synchronous wheel 3 rotates and presses the friction rod 50 against the minimum gap on the inclined surface 41, the friction rod 50 restricts the rotation of the synchronous wheel 3, thus achieving the one-way limiting function.

[0042] This application introduces a friction rod bracket 5, which movably connects the friction rod 50 to the shaft of the synchronous pulley 3, allowing the friction rod bracket 5 to rotate relative to the shaft. When the synchronous pulley 3 rotates, it can drive the friction rod bracket 5 to rotate in the same direction by a certain angle based on friction or magnetic force, thus allowing the friction rod 50 on the friction rod bracket 5 to move upwards or downwards on the inclined surface 41 of the one-way limiting base 4. When the friction rod 50 can enter the inclined surface 41 and press against the minimum gap, it restricts the rotation of the synchronous pulley 3. This implementation, by introducing the friction rod bracket 5 and allowing it to rotate by a certain angle, controls the movement of the friction rod 50 on the inclined surface 41. The rotational setting of the friction rod bracket 5 allows the friction rod 50 to automatically adjust its position according to the rotation direction of the synchronous pulley 3, thereby achieving one-way limiting and enhancing the stability and reliability of the one-way transmission structure. Compared with the prior art, the technical solution of this application has the following advantages: First, by rotating the friction rod bracket 5, the friction rod 50 can automatically adjust its position according to the rotation direction of the synchronous wheel 3, thereby achieving a more stable and reliable unidirectional limiting function; second, the design of the friction rod bracket 5 can enhance the friction or magnetic force between the friction rod 50 and the synchronous wheel 3, making the unidirectional limiting more secure; finally, the various design methods of the friction rod bracket 5 can be selected according to actual needs, further improving the applicability and flexibility of the technical solution.

[0043] like Figure 4 and 5As shown, the friction rod support 5 is L-shaped, with a bushing 51 at its center. The first end of the friction rod support 5 is connected to a U-shaped support 52. A magnet 53 is fixed to the U-shaped support 52; the wheel surface of the synchronous wheel 3 is located within the U-shaped opening of the U-shaped support 52. Specifically, the design of the U-shaped support 52 allows the wheel surface of the synchronous wheel 3 to be partially embedded in the U-shaped opening, thus ensuring that the friction rod support 5 can rotate around the axis of the synchronous wheel 3. The magnet 53 is fixed to the U-shaped support 52, so that the synchronous wheel 3 can drive the friction rod support 5 to rotate via magnetic force when it rotates. This design not only simplifies the structure but also improves the reliability of the system. Therefore, this application achieves the connection and motion control between the friction rod support 5 and the synchronous wheel 3 through the design of the U-shaped support 52 and the magnet 53. The U-shaped opening of the U-shaped support 52 accommodates the wheel surface of the synchronous wheel 3, allowing the friction rod support 5 to rotate around the axis of the synchronous wheel 3. When the synchronous pulley 3 rotates, it passes through the magnet 53, thereby generating a force for the friction rod support 5 to rotate in the same direction. This ensures that the friction rod 50 can effectively enter the inclined surface 41 of the one-way limiting base 4 when the synchronous pulley 3 rotates, thus restricting the rotation of the synchronous pulley 3. This design simplifies the structure, improves the reliability of the system, and ensures the effectiveness of unidirectional transmission. Compared with the prior art, the technical solution of this application, through the combination of the magnet 53 and the U-shaped bracket 52, achieves effective connection and motion control between the friction rod support 5 and the synchronous pulley 3, avoiding the complex mechanical connection methods in traditional structures, reducing component wear and failure rate, and improving the stability and service life of the system.

[0044] In the embodiment shown in the figure, a U-shaped groove 521 is constructed at the upper end of the U-shaped bracket 52. Mounting holes 522 are constructed on the U-shaped side walls of the U-shaped bracket 52 inside the U-shaped groove 521. Magnets 53 are embedded in the mounting holes 522 on both sides. U-shaped clips 54 are embedded in the U-shaped groove 521 of the U-shaped bracket 52, covering the magnets 53 within the mounting holes 522. Specifically, the design of the U-shaped groove 521 allows the magnets 53 to be securely mounted on the side walls of the U-shaped bracket 52. Through the action of the magnets 53, the friction rod 50 can maintain stable contact with the synchronous wheel 3. The design of the U-shaped clips 54 further enhances the fixing effect of the magnets 53, preventing them from falling off or shifting during movement. The magnets 53 can be rare-earth magnets 53 or ferrite magnets 53, the specific choice depending on the required magnetic force and cost considerations. The U-shaped clips 54 can be made of metal materials, such as stainless steel or aluminum alloy, to ensure their strength and durability. This application provides a brief and detailed overview of the technical solution. Through the action of magnet 53, stable contact is ensured between friction rod 50 and synchronous wheel 3. This allows friction rod 50 to move on the inclined surface 41 of the unidirectional limiting base 4 as synchronous wheel 3 rotates, achieving unidirectional transmission. The design of the U-shaped clamp 54 further enhances the fixing effect of magnet 53, improving the reliability and stability of the entire structure. Compared with existing technologies, this solution achieves stable contact between friction rod 50 and synchronous wheel 3 through magnetic force, avoiding the wear and loosening problems that may arise from traditional mechanical contact methods, and improving the durability and stability of the transmission structure.

[0045] like Figure 5As shown, the second end of the friction rod bracket 5 is connected to the swing rod 55, and the friction rod 50 is rotatably mounted at the end of the swing rod 55. When the bushing 51 of the friction rod bracket 5 is movably fitted onto the shaft of the synchronous wheel 3, the second end of the friction rod bracket 5 extends beyond the edge of the synchronous wheel 3, and the friction rod 50 is located outside the wheel surface of the synchronous wheel 3. When the synchronous wheel 3 rotates, it drives the friction rod 50 to move on the inclined surface 41 of the one-way limiting base 4, thereby allowing the friction rod 50 to move closer to or further away from the wheel surface of the synchronous wheel 3. Specifically, the design of the L-shaped friction rod bracket 5 makes the fit between the friction rod 50 and the synchronous wheel 3 more flexible and stable. The bushing 51 is movably fitted onto the shaft of the synchronous wheel 3, allowing the friction rod bracket 5 to move with the rotation of the synchronous wheel 3. The design of the U-shaped bracket 52 further enhances the stability of the friction rod bracket 5, ensuring that it will not shift or loosen during rotation. The second end of the friction rod bracket 5 extends beyond the edge of the synchronous wheel 3, and the friction rod 50 is located outside the wheel surface of the synchronous wheel 3. This design allows the friction rod 50 to move on the inclined surface 41 of the one-way limiting base 4 when the synchronous wheel 3 rotates, thereby limiting the rotation of the synchronous wheel 3. Thus, the technical solution of this application achieves effective cooperation between the friction rod 50 and the synchronous wheel 3 through the design of the L-shaped friction rod bracket 5. The bushing 51 of the L-shaped bracket is movably fitted onto the shaft of the synchronous wheel 3, and the U-shaped bracket 52 at the first end allows the friction rod bracket 5 to move with the rotation of the synchronous wheel 3. The second end of the friction rod bracket 5 extends beyond the edge of the synchronous wheel 3, and the friction rod 50 is located outside the wheel surface of the synchronous wheel 3. This design allows the friction rod 50 to move on the inclined surface 41 of the one-way limiting base 4 when the synchronous wheel 3 rotates, thereby limiting the rotation of the synchronous wheel 3. The structure of the L-shaped bracket simplifies the overall design while ensuring stable contact between the friction rod 50 and the synchronous wheel 3, improving the reliability and stability of the one-way transmission structure. Compared with the prior art, the technical solution of this application not only simplifies the structural design, but also improves the stability and reliability of the unidirectional transmission structure, effectively solving the problem of stability and reliability of the unidirectional transmission structure in a non-powered treadmill.

[0046] like Figure 6As shown, the one-way limiting base 4 includes a base body 45 and an inclined surface 41 disposed on the base body 45. A lower stop 46 is provided at the lower end of the inclined surface 41. When the friction rod 50 is engaged in the minimum gap, the lower end of the friction rod 50 is supported by the lower stop 46. The base body 45 is the main structural part of the one-way limiting base 4, providing overall support. The inclined surface 41 is disposed on the base body 45, and its function is to guide the movement direction of the friction rod 50, ensuring that the friction rod 50 can smoothly enter the minimum gap. The lower stop 46 is located at the lower end of the inclined surface 41, providing additional support force when the friction rod 50 is engaged in the minimum gap, preventing the friction rod 50 from being pressed past the minimum gap due to the large rotational force of the synchronous wheel 3, thus preventing the one-way structure from failing. Specifically, the design of the inclined surface 41 can be straight or curved, and the specific shape can be adjusted according to actual needs. The lower stop 46 can be fixed or adjustable. A fixed lower stop 46 is fixed to the base body 45 by welding or bolts, while an adjustable lower stop 46 can be adjusted in position via threads or other adjustment mechanisms to accommodate friction rods 50 of different sizes or different working conditions. As a preferred embodiment, the inclined surface 41 can be designed as an inclined surface with a certain angle, ranging from 10 degrees to 45 degrees, to ensure that the friction rod 50 can smoothly slide into the minimum gap. The material of the lower stop 46 can be high-strength steel or wear-resistant alloy to improve its durability and pressure resistance. Thus, the technical solution of this application, through the design of the base body 45 and the inclined surface 41, ensures stable support for the friction rod 50 when it is engaged in the minimum gap. Specifically, the base body 45 provides structural support, while the inclined surface 41 guides the movement direction of the friction rod 50. The function of the lower stop 46 is to provide additional support force when the friction rod 50 is engaged in the minimum gap, preventing the friction rod 50 from being pressed past the minimum gap due to excessive rotational force of the synchronous wheel 3, thus preventing unidirectional structural failure. This design not only enhances the stability of the unidirectional transmission structure but also improves its durability and safety. Compared with the prior art, the technical solution of this application has the following advantages: First, the design of the lower stop 46 effectively prevents the friction rod 50 from being pressed through when it is engaged in the minimum gap, thereby improving the reliability of the unidirectional transmission structure; second, the design of the inclined surface 41 makes the movement of the friction rod 50 smoother, reduces frictional resistance, and improves transmission efficiency; finally, the structural design of the base body 45 is simple, easy to manufacture and install, and reduces production costs.

[0047] Furthermore, an upper stop 47 is provided on the base body 45 above the inclined surface 41. The upper stop 47 is used to limit the rotation angle of the friction rod support 5. The specific implementation of the upper stop 47 can include, but is not limited to, the following: the upper stop 47 can be a protruding structure fixed on the base body 45, its position and shape designed to contact the friction rod support 5 and limit its rotation angle; the upper stop 47 can also be an adjustable limiting device, whose position can be adjusted to adapt to different rotation angle limiting requirements; in addition, the upper stop 47 can also be made of elastic material to reduce the impact on the friction rod support 5 while limiting the rotation angle. This application effectively solves the problem of excessive rotation angle of the friction rod support 5 by providing an upper stop 47 on the base body 45 above the inclined surface 41. The function of the upper stop 47 is to limit the rotation angle of the friction rod support 5, ensuring that the friction rod 50 does not exceed a predetermined range when moving on the inclined surface 41 of the unidirectional limiting base 4. This design, through physical constraints, prevents excessive rotation of the friction rod support 5, thereby avoiding poor contact or disengagement between the friction rod 50 and the synchronous wheel 3 due to excessive rotation angle, ensuring the stability and safety of the unidirectional transmission structure. The upper stop 47 ensures that the friction rod 50 remains within its effective working range during movement, guaranteeing the reliability and long-term stability of the unidirectional transmission structure. Compared with existing technologies, the technical solution of this application is structurally simpler and can more precisely control the rotation angle of the friction rod support 5, thus improving the overall performance and service life of the unidirectional transmission structure.

[0048] The above solution will produce the following results:

[0049] When the athlete moves, the running belt rotates counterclockwise, causing the wheel assembly 2 to rotate counterclockwise. Simultaneously, the synchronous wheel 3 on the wheel assembly 2 receives an upward driving force and begins to rotate counterclockwise. As the synchronous wheel 3 rotates counterclockwise, it passes through the U-shaped opening of the U-shaped bracket 52, exerting a similarly directional attraction on the magnet at the top of the friction rod bracket 5, driving the friction rod bracket 5 to rotate counterclockwise. Initially, the friction rod 50 is in contact with the synchronous wheel 3. As the synchronous wheel 3 begins to rotate counterclockwise, the friction rod bracket 5 also rotates counterclockwise, causing the friction rod 50 to continue moving away from the synchronous wheel 3. The friction rod bracket 5 then rests against the upper stop block 47, preventing further movement. At this point, the friction rod 50 is not in contact with the surface of the synchronous wheel 3 and cannot obstruct the counterclockwise movement of the running belt.

[0050] When the running belt moves clockwise, the wheel assembly 2 rotates clockwise, and the synchronous wheel 3 on the wheel assembly 2 receives a downward driving force and begins to move clockwise. The clockwise rotation of the synchronous wheel 3 provides a magnetic force in the same direction to the magnet at the top of the friction rod bracket 5, driving the friction rod bracket 5 to move clockwise. At the same time, it provides a downward driving force to the friction rod 50 connected to it, and under the action of gravity and friction, it begins to move counterclockwise. As the friction rod 50 moves downward on the inclined surface 41 of the one-way limiting base 4, it slowly approaches the synchronous wheel 3. When the two surfaces come into contact, the upward reverse friction force generated by the friction rod 50 on the synchronous wheel 3 prevents the synchronous wheel 3 from moving clockwise, and further compresses them, preventing the synchronous wheel 3 from moving clockwise, thus achieving the effect of one-way transmission of the running belt.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A unidirectional transmission structure for a treadmill, comprising a wheel assembly (2) rotatably mounted on a frame (1) and connected to a running track; characterized in that: The wheel assembly (2) is connected to a synchronous wheel (3), and a one-way limiting base (4) is fixed to the frame next to the synchronous wheel (3). The one-way limiting base (4) has an inclined surface (41) adjacent to the wheel surface of the synchronous wheel (3). It also includes a friction rod (50), which is disposed on the inclined surface (41). The diameter of the friction rod (50) is greater than the minimum gap between the inclined surface (41) and the wheel surface of the synchronous wheel (3). The friction rod (50) restricts the rotation of the synchronous wheel (3) only when the synchronous wheel (3) rotates clockwise or counterclockwise and presses the friction rod (50) against the minimum gap.

2. The unidirectional transmission structure on a treadmill according to claim 1, characterized in that: The friction rod (50) is rolled on the inclined surface (41) of the one-way limiting base (4). Under the action of gravity, the friction rod (50) is always in contact with the wheel surface of the synchronous wheel (3). When the synchronous wheel (3) rotates clockwise and counterclockwise, it provides frictional force to the friction rod (50) in the up and down direction along the inclined surface (41).

3. The unidirectional transmission structure on a treadmill according to claim 2, characterized in that: The unidirectional limiting base (4) includes two side plates (42) on both sides of the inclined surface (41). The upper ends of the two side plates (42) extend beyond the inclined surface (41) and form a groove (40) between them. The groove (40) has the inclined surface (41) as its bottom surface. The friction rod (50) is placed on the inclined surface (41) in the groove (40). When the synchronous wheel (3) rotates, part of its wheel surface passes through the groove (40).

4. The unidirectional transmission structure on a treadmill according to claim 3, characterized in that: The unidirectional limiting base (4) includes a sealing cap (43) disposed above the inclined surface (41), and the sealing cap (43) is connected to two side plates (42).

5. The unidirectional transmission structure on a treadmill according to claim 1, characterized in that: It also includes a friction rod support (5), the center of which is movably sleeved on the shaft of the synchronous wheel (3); the friction rod (50) is rotatably mounted on the friction rod support (5), and when the synchronous wheel (3) rotates, it can drive the friction rod support (5) to rotate based on friction or magnetic force, so that the friction rod (50) on the friction rod support (5) can move on the inclined surface (41) of the one-way limiting base (4); the friction rod (50) restricts the rotation of the synchronous wheel (3) only when the synchronous wheel (3) rotates and the friction rod (50) is on the inclined surface (41) and pressed against the minimum gap.

6. The unidirectional transmission structure on a treadmill according to claim 5, characterized in that: The friction rod support (5) includes a U-shaped support (52), on which a magnet (53) is fixed; the wheel surface of the synchronous pulley (3) is located in the U-shaped opening of the U-shaped support (52).

7. The unidirectional transmission structure on a treadmill according to claim 6, characterized in that: The upper end of the U-shaped bracket (52) is provided with a U-shaped groove (521), and the U-shaped groove (521) is provided with mounting holes (522) on the U-shaped side walls of the U-shaped bracket (52). Magnets (53) are embedded in the mounting holes (522) on both sides. U-shaped clips (54) are embedded in the U-shaped groove (521) of the U-shaped bracket (52), and the U-shaped clips (54) cover the magnets (53) in the mounting holes (522).

8. The unidirectional transmission structure on a treadmill according to claim 6, characterized in that: The friction rod bracket (5) is L-shaped, and a bushing (51) is provided at the center of the friction rod bracket (5). The first end of the friction rod bracket (5) is connected to a U-shaped bracket (52), and the second end of the friction rod bracket (5) is connected to a swing rod (55). The friction rod (50) is rotatably mounted at the end of the swing rod (55). When the bushing (51) of the friction rod bracket (5) is movably sleeved on the shaft of the synchronous wheel (3), the second end of the friction rod bracket (5) extends out of the edge of the synchronous wheel (3), and the friction rod (50) is located outside the wheel surface of the synchronous wheel (3). When the synchronous wheel (3) rotates, it drives the friction rod (50) to move on the inclined surface (41) of the one-way limiting base (4), thereby making the friction rod (50) closer to or further away from the wheel surface of the synchronous wheel (3).

9. The unidirectional transmission structure on a treadmill according to claim 5, characterized in that: The one-way limiting base (4) includes a base body (45) and an inclined surface (41) provided on the base body (45). A lower stop (46) is provided at the lower end of the inclined surface (41). When the friction rod (50) is inserted into the minimum gap, the lower end of the friction rod (50) is supported by the lower stop (46).

10. A unidirectional transmission structure for a treadmill according to claim 9, characterized in that: An upper stop (47) is provided on the base body (45) above the inclined plane (41), and the upper stop (47) is used to limit the rotation angle of the friction rod support (5).

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