Treadmill and clutch traction device thereof

Abstract

The utility model relates to the technical field of fitness equipment, in particular to a treadmill and a clutch traction device thereof. The clutch shifting fork is configured to be connected with the clutch wheel shaft sleeve; the upper end of the first link rod is connected with the clutch control panel; the tail end of the second connecting rod is connected with the clutch shifting fork; the switching assembly comprises a movable seat rotationally arranged on the rack, and the movable seat is hinged to the lower end of the first link rod and the initial end of the second link rod; when the adjusting handle drives the clutch control disc to rotate, the clutch control disc drives the switching assembly to rotate through the first connecting rod, the switching assembly drives the clutch shifting fork to move through the second connecting rod, and then the clutch wheel shaft sleeve and the clutch disc on the clutch wheel shaft sleeve are driven to move in the axial direction to achieve clutch state switching. The scheme has the advantages of simplified and compact structure, high control precision and long service life.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment technology, and in particular to a treadmill and its clutch traction device. Background Technology

[0002] In the power transmission system of a treadmill, the clutch traction device is a key component for achieving the coupling and disengagement of the running belt's power. Traditional clutch traction devices typically use a traction rope control method: an adjustment handle located on the handrail drives the clutch control disc to rotate, and two traction ropes are connected to the traction clutch device at the bottom of the treadmill. One traction rope is used to pull the clutch disc to engage the power, while the other traction rope or a matching return spring is used to drive the clutch disc to return to its original position to disengage the power.

[0003] This traditional structure has several technical drawbacks:

[0004] First, the structure of the dual traction ropes and the return spring results in a complex overall layout, which not only increases the difficulty of assembly, but also occupies valuable installation space inside the treadmill.

[0005] Secondly, the material properties of the traction rope determine that it will inevitably undergo tensile deformation and wear and aging during use. This degradation of physical properties will directly affect the control accuracy of the clutch stroke.

[0006] Furthermore, the inherent elastic deformation characteristics of flexible rope drives can lead to sluggish operation response, making it difficult to achieve precise control of the axial displacement of the clutch disc.

[0007] Finally, in order to maintain the normal operation of the system, frequent maintenance operations such as adjusting the tension of the traction rope are required; otherwise, the clutch function may fail or abnormal noise may be generated.

[0008] These technical defects severely limit the reliability and lifespan of treadmill clutch systems. Existing technologies urgently need improvement to address these issues. Summary of the Invention

[0009] In order to solve the above problems, the purpose of this utility model is to provide a treadmill and its clutch traction device, which has the advantages of simple and compact structure, high control precision and long service life.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] This application provides a clutch traction device for a treadmill, the technical solution of which is as follows: A clutch traction device for a treadmill includes: a clutch control disc configured to be connected to an adjustment handle; a clutch shift fork configured to be connected to a clutch wheel bushing; a first connecting rod, the upper end of which is connected to the clutch control disc; a second connecting rod, the lower end of which is connected to the clutch shift fork; and a transfer assembly including a movable seat rotatably mounted on the frame, the movable seat being hinged to the lower end of the first connecting rod and the beginning end of the second connecting rod respectively; wherein, when the adjustment handle drives the clutch control disc to rotate, the clutch control disc drives the transfer assembly to rotate through the first connecting rod, and the transfer assembly drives the clutch shift fork to move through the second connecting rod, thereby driving the clutch wheel bushing and the clutch disc on it to move axially to achieve clutch state switching.

[0012] Furthermore, this application also proposes that the adjustment handle is located at the upper end of the column or on the handrail at the upper end of the column; the clutch control disc is located inside the adjustment handle; the adapter assembly is hinged to the frame at the lower end of the column; the first connecting rod passes through the column, and its lower end is hinged to the adapter assembly through the column through hole on the side of the column.

[0013] Furthermore, this application also proposes that the side wall of the frame is provided with a base for connecting the lower end of the column, and the side wall of the base has a base through hole; the adapter assembly is installed inside the base; the lower end of the first connecting rod passes through the column through hole and the base through hole in sequence and is hinged to the adapter assembly.

[0014] Furthermore, this application also proposes that the adapter assembly further includes a fixing plate, which is fixed to the frame, and the movable seat is rotatably mounted on the fixing plate.

[0015] Furthermore, this application also proposes that the cross-section of the movable seat is triangular, with one end hinged to the fixed plate and the other two ends respectively provided with a first hinge hole and a second hinge hole; the lower end of the first connecting rod is hinged to the first hinge hole, and the beginning end of the second connecting rod is hinged to the second hinge hole.

[0016] Furthermore, this application also proposes that the clutch shift fork includes: a shift fork seat, fixed on the frame; a rotating shaft, rotatably mounted on the shift fork seat; a clutch rocker arm, mounted on the rotating shaft; a connecting plate, connecting the clutch rocker arm and the clutch wheel bushing; the end of the second connecting rod is connected to the rotating shaft; when the second connecting rod drives the rotating shaft to rotate, the clutch rocker arm rotates with the rotating shaft and drives the clutch wheel bushing to move axially through the connecting plate.

[0017] Furthermore, this application also proposes that there are two clutch levers, each sleeved on the rotating shaft, and the ends of the two clutch levers are connected to the same connecting plate.

[0018] Furthermore, this application also proposes that one end of the rotating shaft extends out of the shift fork seat, and a drive rocker arm assembly is fixedly connected to the extended section; the end of the second connecting rod is connected to the drive rocker arm assembly, and the rotating shaft is driven to rotate through the drive rocker arm assembly.

[0019] Furthermore, this application also proposes that the drive rocker arm assembly includes: a drive rocker arm, fixedly connected to the extended end of the rotating shaft; a clamping plate, fixedly connected to the movable end of the drive rocker arm; and the end of the second connecting rod rotatably disposed between the clamping plate and the drive rocker arm.

[0020] Furthermore, this application also proposes a treadmill including the aforementioned clutch traction device.

[0021] As can be seen from the above, the treadmill and its clutch traction device provided in this application replace the traditional traction rope structure with the rigid transmission of the connecting rod and the adapter assembly. The first connecting rod transmits the rotational motion of the clutch control disc, and after the adapter assembly changes the direction of motion, it drives the clutch shift fork through the second connecting rod to realize the axial displacement control of the clutch disc. It has the advantages of simplified and compact structure, high control accuracy and long service life. Attached Figure Description

[0022] Figure 1 An exploded schematic diagram of the upright section of a treadmill provided in this application.

[0023] Figure 2 This application provides a schematic diagram of the installation of a column and adjustment handle on a treadmill.

[0024] Figure 3 An exploded schematic diagram of a clutch traction device provided in this application.

[0025] Figure 4 This is a magnified view of a portion of the area surrounding the adapter components on a treadmill.

[0026] Figure 5 This is a magnified view of the area surrounding the clutch fork on a treadmill. 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 specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] 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.

[0032] Example 1:

[0033] like Figure 1-5As shown, this embodiment proposes a clutch traction device for a treadmill, including a clutch control disc 1, a clutch fork 2, a first connecting rod 3, a second connecting rod 4, and a transition assembly 5. The clutch control disc 1 is connected to the adjusting handle 8, which can be directly fixed or selectively connected; for specific connection methods, please refer to the prior application with application number 2025106992225. The upper end of the first connecting rod 3 is connected to the clutch control disc 1, and the end of the second connecting rod 4 is connected to the clutch fork 2. The transition assembly 5 includes a movable seat 51, which is rotatably mounted on the frame 6 and hinged to the lower end of the first connecting rod 3 and the beginning end of the second connecting rod 4. When the adjusting handle 8 drives the clutch control disc 1 to rotate, the power is transmitted sequentially through the first connecting rod 3, the transition assembly 5, and the second connecting rod 4 to the clutch fork 2, driving the clutch disc 91 to move axially to complete the clutch state switching.

[0034] The clutch control disc 1 is a transmission component rigidly connected to the adjusting handle 8. It can be implemented using a metal disc structure with a shaft hole, and its rotational motion is directly transmitted to the first connecting rod 3 via a mechanical connection. The clutch shift fork 2 is an actuator linked to the clutch wheel bushing 9. It can be implemented using a shift fork assembly with a rotating shaft 22 and a rocker arm, used to convert the linear motion of the second connecting rod 4 into the axial displacement of the clutch disc 91. The first connecting rod 3 is a rigid rod connecting the clutch control disc 1 and the adapter assembly 5. It can be implemented using a stainless steel tube or aluminum alloy profile, and its length is determined according to the distance between the handle's installation position and the adapter assembly 5. The movable seat 51 in the adapter assembly 5 is a rotating support structure with multiple hinge points. It can be implemented using a triangular metal plate in conjunction with a rotating shaft, used to change the direction of power transmission and form a stable fulcrum.

[0035] Specifically, when the operator rotates the adjustment handle 8, the clutch control disc 1 rotates synchronously, causing the first connecting rod 3 to shift. The lower end of the first connecting rod 3 pushes the movable seat 51 to rotate around the fixed plate 52 on the frame 6, and the second hinge hole 512 at the other end of the movable seat 51 drives the second connecting rod 4 to move in the opposite direction. The linear motion at the end of the second connecting rod 4 is transmitted to the clutch shift fork 2, which ultimately pushes the clutch wheel bushing 9 to slide axially, thereby realizing the engagement or disengagement of the running belt power system. The entire transmission process is completed through the hinged cooperation of multiple rigid connecting rods, with no flexible elements involved in the motion transmission path, effectively eliminating control errors caused by elastic deformation. Through the above technical solution, this application solves the structural complexity problem of traditional traction rope control methods, and the use of a linkage transmission system significantly simplifies the assembly process and reduces space occupancy. The rigid connection structure avoids rope stretching deformation, ensuring the stability of clutch stroke control. The mechanical linkage system achieves millisecond-level response speed, improving the operational accuracy of clutch state switching. All-metal transmission components eliminate the risk of rope wear, reducing equipment maintenance frequency and operating costs.

[0036] In a further embodiment, the adjusting handle 8 is located on the upper end of the column 7 or on the handrail at the upper end of the column 7; the clutch control disc 1 is located inside the adjusting handle 8; the adapter assembly 5 is hinged to the frame 6 at the lower end of the column 7; the first connecting rod 3 passes through the column 7, and its lower end is hinged to the adapter assembly 5 through the column through hole 71 on the side of the column 7.

[0037] The adjustment handle 8, located on the upper part of the column 7 or as a handrail, refers to the operating component being positioned within the natural grip area. This can be achieved by using an injection-molded handle fitted and fixed to the metal column 7, creating a vertical spatial distribution between the power input and operating ends. The clutch control disc 1, built into the adjustment handle 8, means the drive element is encapsulated within the operating component housing. This can be achieved by a flange structure nested on the handle's rotating shaft, eliminating the exposure of external transmission mechanisms. The adapter assembly 5, hinged to the frame 6 at the lower end of the column 7, refers to the power conversion mechanism being installed at the bottom of the support structure. This can be achieved by using a hinge mechanism with bearing seats, fixed to the welded part of the frame 6, ensuring the power transmission path extends along the axis of the column 7. The first connecting rod 3, passing through the column 7, means the rigid transmission component is constrained within the cavity of the support structure, utilizing the internal space of the structure for concealed transmission. The column through-hole 71 refers to a positioning hole on the side wall of the column 7, serving as a transmission connection point to ensure the freedom of movement between the connecting rod and the adapter assembly 5. Specifically, the vertical arrangement of the operating end and the transmission end forms a compact linear transmission path through the internal space of the column 7. When the operator rotates the handle at the armrest, the built-in clutch control disc 1 drives the first connecting rod 3, which runs through the column 7, to perform a linear reciprocating motion. This connecting rod forms a hinged transmission with the adapter assembly 5 at the frame 6 through the column through hole 71. The adapter assembly 5 converts the vertical linear motion into a horizontal oscillating output, which in turn drives the second connecting rod 4 to control the clutch fork 2. The entire transmission chain forms a closed rigid connection inside the column 7, avoiding the bending loss of the lateral traction rope in traditional solutions.

[0038] This solution replaces the external flexible rope with a rigid connecting rod inside column 7. The transmission components are constrained within the support structure, eliminating travel errors caused by rope slack and avoiding the risk of collisions with external mechanisms. The vertical layout of the adapter component 5 changes the traditional horizontal traction to vertical transmission, aligning the power transmission direction with the axis of the main equipment structure and reducing space waste. Through the above technical solutions, this application effectively solves the problems of complex assembly and large space occupation of traditional traction ropes. By replacing the external flexible rope with a rigid connecting rod inside column 7, the stability of the transmission system is improved, and the operating accuracy is significantly improved due to the rigid connection. The vertical layout of the adapter component 5 makes the overall structure of the equipment more compact, avoids interference from lateral mechanisms, and reduces maintenance needs due to rope aging.

[0039] Furthermore, a base 61 is provided on the side wall of the frame 6 to connect the lower end of the column 7, and a base through hole 611 is opened on the side wall of the base 61; the adapter 5 is installed inside the base 61; so that the lower end of the first connecting rod 3 passes through the column through hole 71 and the base through hole 611 in sequence and is hinged to the adapter 5.

[0040] The base 61 is a support structure fixed to the side wall of the frame 6 and used to connect the lower end of the column 7. It can be implemented by welding or bolting. The base through-hole 611 on its side wall forms a passageway for the connecting rod together with the column through-hole 71. The adapter assembly 5 is installed inside the base 61, meaning the movable seat 51 and the fixed plate 52 are assembled within the cavity formed by the base 61. Specifically, a rotating shaft can be connected to the fixed plate 52, allowing the movable seat 51 to rotate within the base 61 under restricted conditions. The lower end of the first connecting rod 3 passing through the column through-hole 71 and the base through-hole 611 means the connecting rod passes through a hole in the side wall of the column 7, then through a hole in the side wall of the base 61, and finally hinges to the adapter assembly 5, for example, by connecting to the hinge hole on the movable seat 51 via a pin. Specifically, the base 61 is fixed to the side wall of the frame 6 by welding or bolting, and its internal cavity accommodates the adapter component 5. The base through hole 611 on the side wall of the base 61 is coaxially aligned with the column through hole 71 on the side wall of the column 7. The lower end of the first connecting rod 3 passes through the column through hole 71 from inside the column 7, and then continues through the base through hole 611 into the interior of the base 61, and is connected to the hinge hole of the movable seat 51 by a pin. Since the connecting rod is simultaneously limited by both the column through hole 71 and the base through hole 611, the internal space constraint of the base 61 further prevents the adapter component 5 from undergoing displacement deviation during movement. Through the above technical solution, this application solves the problem of low clutch control accuracy caused by unstable connection between the connecting rod and the adapter component 5. By using double through hole limitation and internal space constraint, the coaxiality of the connecting rod hinge point is ensured, while reducing assembly complexity and avoiding transmission delay or failure caused by component deflection.

[0041] like Figure 3 and 4 As shown, a fixing plate 52 is added to the adapter assembly 5. The fixing plate 52 is fixed on the frame 6, and the movable seat 51 is rotatably mounted on the fixing plate 52.

[0042] The fixed plate 52 is a rigid plate that serves as the mounting base for the adapter component 5. It can be achieved by welding a stamped metal plate to the frame 6. Its function is to provide a stable rotational support platform for the movable seat 51, preventing displacement deviation due to deformation under stress. The rotating shaft is the rotating shaft structure connecting the movable seat 51 and the fixed plate 52. It can be achieved by using a cylindrical pin with a limiting flange that passes through the movable seat 51 and the fixed plate 52. Its function is to limit the rotation of the movable seat 51 around the fixed axis, ensuring a linear correspondence between the transmission angles of the first connecting rod 3 and the second connecting rod 4. When the adjusting handle 8 drives the clutch control disc 1 to rotate, the first connecting rod 3 transmits the rotational motion to the movable seat 51, causing the movable seat 51 to deflect around the rotating shaft. Because the rotating shaft and the fixed plate 52 form a rigid connection, the rotation trajectory of the movable seat 51 is strictly limited to around the fixed axis, resulting in a precise lever ratio between the starting direction of the second connecting rod 4 and the end of the first connecting rod 3. This rigid rotating shaft constraint mechanism effectively eliminates the lateral displacement of the movable seat 51 during transmission, ensuring a stable correspondence between the displacement output at the end of the second connecting rod 4 and the axial movement stroke of the clutch disc 91. Through the above technical solution, this application achieves stable installation of the adapter assembly 5 on the frame 6, preventing unexpected positional shifts in the movable seat 51 under stress. The mating structure between the rotating shaft and the fixed plate 52 reduces the angle conversion error during the connecting rod transmission process, ensuring a precise correspondence between the axial movement stroke of the clutch disc 91 and the operating amount of the adjusting handle 8. The rigid support structure reduces transmission lag caused by deformation of moving parts, improving the repeatability accuracy of clutch state switching.

[0043] Specifically, the movable seat 51 has a triangular cross-section, with one end hinged to the fixed plate 52, and the other two ends respectively provided with a first hinge hole 511 and a second hinge hole 512; the lower end of the first connecting rod 3 is hinged to the first hinge hole 511, and the beginning end of the second connecting rod 4 is hinged to the second hinge hole 512.

[0044] The movable seat 51 is the transmission component connecting the first connecting rod 3 and the second connecting rod 4. It can be manufactured using metal sheet stamping or casting processes, and its triangular cross-section design enhances structural rigidity. The first hinge hole 511 and the second hinge hole 512 are connection holes located at both ends of the movable seat 51, respectively. These holes can be machined using drilling or riveting processes to achieve hinged transmission between the first connecting rod 3 and the second connecting rod 4. One end of the movable seat 51 is hinged to the fixed plate 52 via a rotating shaft, forming a rotation fulcrum. The other end connects to the first connecting rod 3 via the first hinge hole 511, and to the second connecting rod 4 via the second hinge hole 512. When the adjusting handle 8 drives the clutch control disc 1 to rotate, the first connecting rod 3 pushes the movable seat 51 to rotate around the rotating shaft. The triangular structure of the movable seat 51 converts the linear motion of the first connecting rod 3 into the linear motion of the second connecting rod 4, thereby driving the clutch fork 2 to actuate and change the direction of motion.

[0045] like Figure 3 and 5 As shown, the clutch fork 2 includes a fork seat 21 fixed on the frame 6, a rotating shaft 22 rotatably mounted on the fork seat 21, a clutch lever 23 mounted on the rotating shaft 22, a connecting plate 24 connecting the clutch lever 23 and the clutch wheel bushing 9, and a second connecting rod 4 whose end is connected to the rotating shaft 22. When the second connecting rod 4 drives the rotating shaft 22 to rotate, the clutch lever 23 rotates with the rotating shaft 22 and drives the clutch wheel bushing 9 to move axially through the connecting plate 24.

[0046] The shift fork seat 21 is a rigid support structure used to support the rotational motion of the rotating shaft 22. It can be made by stamping a metal sheet and welding it to the frame 6, forming a stable foundation for the rotational motion of the rotating shaft 22. The rotating shaft 22 is a shaft component that realizes rotational motion. It can be made by mounting a stepped shaft with a bearing inside the shift fork seat 21, converting the linear motion of the second connecting rod 4 into rotational motion. The clutch lever 23 is a rigid rod that transmits the rotational power of the rotating shaft 22. It can be made by cutting an L-shaped component from a steel plate and fitting it to the end of the rotating shaft 22, with its rotation angle synchronized with the rotating shaft 22. The connecting plate 24 is a transmission component that connects the clutch lever 23 and the clutch wheel bushing 9. It can be made by stamping a metal plate with hinge holes at both ends, converting rotational motion into axial displacement. The connection between the end of the second connecting rod 4 and the rotating shaft 22 refers to a rigid connection that drives the rotating shaft 22 to rotate. Specifically, this can be achieved by setting a U-shaped fork at the end of the connecting rod and hinged to the drive rocker arm assembly 25 at the end of the rotating shaft 22, ensuring smooth power transmission. In the specific design, the end of the second connecting rod 4 is rigidly connected to the rotating shaft 22 via the drive rocker arm assembly 25. When the second connecting rod 4 is driven by the adapter assembly 5 to produce linear motion, the drive rocker arm assembly 25 converts the linear motion into the rotational motion of the rotating shaft 22. The rotation of the rotating shaft 22 drives the clutch rocker arm 23, which is sleeved on it, to rotate synchronously. The end of the clutch rocker arm 23 is hinged to the clutch wheel bushing 9 via the connecting plate 24, so that the rotational motion of the clutch rocker arm 23 is converted into the linear displacement of the connecting plate 24, thereby pushing the clutch wheel bushing 9 to move axially. During this process, the shift fork seat 21 provides stable rotational support for the rotating shaft 22, eliminating radial offset that may occur during movement; the rigid connection between the rotating shaft 22 and the clutch lever 23 ensures a linear correspondence between the rotation angle and the output displacement; the rigid structure of the connecting plate 24 avoids displacement deviation caused by flexible deformation during transmission. Through the above technical solution, this application solves the structural redundancy problem caused by flexible transmission in traditional traction rope control schemes. By adopting a transmission method that uses a rigid connecting rod in conjunction with the rotating shaft 22, the rotational control signal of the operating handle is directly converted into the precise axial displacement of the clutch wheel bushing 9, eliminating the risk of stroke loss of control caused by rope tension or wear. The rigid connection between the transmission components ensures that there is no elastic deformation in the power transmission path, improving the response speed and control accuracy of clutch state switching. At the same time, the overall structure reduces the number of redundant parts, reducing assembly complexity and maintenance frequency.

[0047] In the specific design, there are two clutch levers 23, which are respectively sleeved on the rotating shaft 22, and the ends of the two clutch levers 23 are connected to the same connecting plate 24.

[0048] The clutch lever 23 is a transmission component that converts the rotational motion of the rotating shaft 22 into the linear movement of the connecting plate 24. It can be made of metal stamping or casting. Two clutch levers 23 are symmetrically fitted onto both ends of the rotating shaft 22, forming a double-fulcrum structure. This symmetrical arrangement balances the force on the rotating shaft 22. The connecting plate 24 is a rigid component connecting the ends of the two clutch levers 23. It can be formed by stamping a steel plate with mounting holes. The connecting plate 24 constrains the synchronous motion trajectory of the two levers, eliminating motion errors caused by assembly gaps. Specifically, when the rotating shaft 22 rotates, the two clutch levers 23 swing synchronously around the axis of the rotating shaft 22. Since the connecting plate 24 is hinged to the ends of both levers, the swing angles of the two levers are forced to remain consistent. The two levers are symmetrically distributed on both sides of the axial direction of the rotating shaft 22, ensuring a symmetrical distribution of the bending moment borne by the rotating shaft 22 in the axial direction, avoiding uneven loads on the rotating shaft 22 caused by a single lever. When the connecting plate 24 is subjected to the reverse force from the clutch wheel bushing 9, the load is evenly distributed to the rotating shaft 22 through the two rocker arms, preventing the single rocker arm from undergoing plastic deformation due to stress concentration.

[0049] Furthermore, one end of the rotating shaft 22 extends out of the shift fork seat 21, and a drive rocker arm assembly 25 is fixedly connected to the extended section. The end of the second connecting rod 4 is connected to the drive rocker arm assembly 25, and the rotating shaft 22 is driven to rotate by the drive rocker arm assembly 25.

[0050] The extended section of the rotating shaft 22 refers to the portion of the rotating shaft 22 that extends beyond the shift fork seat 21. This can be achieved by extending the length of the rotating shaft 22 and fixing the drive rocker arm assembly 25, providing a rigid connection point for the second connecting rod 4 and preventing positional misalignment caused by flexible transmission. The drive rocker arm assembly 25 is a rigid force transmission structure composed of the drive rocker arm 251 and the clamping plate 252. It can be connected to the rotating shaft 22 by welding or bolting, converting the linear motion of the second connecting rod 4 into the rotational motion of the rotating shaft 22. The connection space formed between the clamping plate 252 and the drive rocker arm 251 accommodates the end of the second connecting rod 4. This can be achieved by setting a pivot pin to achieve a hinge, ensuring that the driving force of the second connecting rod 4 is evenly transmitted to the rotating shaft 22. When the end of the second connecting rod 4 moves linearly between the clamping plate 252 and the drive rocker arm 251, the drive rocker arm 251 generates a rotational torque around the axis of the rotating shaft 22, causing the rotating shaft 22 to rotate synchronously. Because the drive lever assembly 25 and the rotating shaft 22 are rigidly connected, energy loss during movement is significantly reduced, and a linear relationship is formed between the rotation angle of the rotating shaft 22 and the displacement of the second connecting rod 4. This rigid transmission mechanism eliminates the stroke error caused by the stretching deformation of the traction rope, while avoiding the problem of gap accumulation due to component wear.

[0051] Specifically, the drive rocker assembly 25 includes a drive rocker 251 and a clamping plate 252. The drive rocker 251 is fixed to the extended end of the rotating shaft 22, and the clamping plate 252 is fixed to the movable end of the drive rocker 251. The end of the second connecting rod 4 is rotatably disposed between the clamping plate 252 and the drive rocker 251.

[0052] The drive rocker arm 251 is a rigid transmission component fixed to the extended end of the rotating shaft 22. It can be implemented using metal plate welding or bolt locking, and is used to rigidly combine the rotational motion of the rotating shaft 22 with the driving action of the second connecting rod 4. The clamping plate 252 is a plate-shaped constraint component fixed to the movable end of the drive rocker arm 251. It can be implemented using a stamped steel plate connected to the drive rocker arm 251 by riveting, and is used to form a double-sided clamping space with the drive rocker arm 251 to restrict the degree of freedom of movement at the end of the second connecting rod 4. The rotational setting refers to the connection of the end of the second connecting rod 4 between the clamping plate 252 and the drive rocker arm 251 via a pin. This can be implemented using a hinge structure with needle roller bearings, allowing the end of the second connecting rod 4 to rotate around a fixed axis while transmitting push and pull forces. The drive rocker arm 251 and the rotating shaft 22 are rigidly connected to form a fixed fulcrum. The clamping plate 252 forms a constraint boundary at the end of the drive rocker arm 251. After the end of the second connecting rod 4 is inserted into the clamping space formed by the two, it is hinged by the pin. When the second connecting rod 4 is subjected to a pushing or pulling force, the driving swing rod 251 converts the linear motion into the rotational motion of the rotating shaft 22. The clamping plate 252 prevents radial displacement of the end of the second connecting rod 4 through double-sided constraints, while the pin-hinged structure allows the second connecting rod 4 to rotate freely during axial movement. This three-point rigid connection, through the combination of the rotating shaft 22, the driving swing rod 251, and the clamping plate 252, eliminates the swing backlash of traditional single-point hinges when transmitting power, ensuring precise control of the movement trajectory of the end of the second connecting rod 4.

[0053] Example 2:

[0054] This application further proposes a treadmill employing the clutch traction device described in Embodiment 1, comprising a clutch control disc 1, a clutch fork 2, a first connecting rod 3, a second connecting rod 4, and a transfer assembly 5. When the adjustment handle 8 is operated, the clutch control disc 1 drives the first connecting rod 3 to generate displacement, which is converted into a change in the direction of motion of the second connecting rod 4 through the swing of the transfer assembly 5. The second connecting rod 4 transmits the swing to the clutch fork 2, causing it to drive the clutch wheel bushing 9 to generate axial displacement. In this process, the hinged engagement between the connecting rods ensures the synchronicity of motion transmission, while the rotating shaft structure of the transfer assembly 5 achieves spatial optimization of the power transmission path. The linear transmission characteristics of the rigid connecting rods eliminate the risk of elastic deformation of the traction rope, making the axial movement distance of the clutch disc 91 precisely correspond to the operating angle of the handle. Through the above technical solutions, this application simplifies the structural layout of the clutch control device and reduces the number of motion transmission components; eliminates the loss of stroke control caused by the deformation of the traction rope, and ensures the consistency between the movement distance of the clutch disc 91 and the operation of the handle; shortens the power transmission path through the direct transmission of the rigid linkage, and improves the clutch response speed; avoids the risk of aging and breakage of the traction rope, and reduces the maintenance frequency.

[0055] 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.

[0056] 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 clutch traction device for a treadmill, characterized in that, include: Clutch control disc (1), which is configured to be connected to adjustment handle (8); Clutch shift fork (2), configured to connect to clutch wheel bushing; The first connecting rod (3) is connected at its upper end to the clutch control disc (1); The second connecting rod (4) is connected at its end to the clutch fork (2); The adapter assembly (5) includes a movable seat (51) rotatably mounted on the frame (6), wherein the movable seat (51) is hinged to the lower end of the first connecting rod (3) and the beginning end of the second connecting rod (4); When the adjusting handle (8) drives the clutch control disc (1) to rotate, the clutch control disc (1) drives the adapter assembly (5) to rotate through the first connecting rod (3), and the adapter assembly (5) drives the clutch shift fork (2) to move through the second connecting rod (4), thereby driving the clutch wheel bushing (9) and the clutch disc (91) on it to move axially to achieve clutch state switching.

2. The clutch traction device according to claim 1, characterized in that: The adjustment handle (8) is located on the upper end of the column (7) or on the handrail at the upper end of the column (7); The clutch control disc (1) is located inside the adjusting handle (8); The adapter assembly (5) is hinged to the frame (6) at the lower end of the column (7); The first connecting rod (3) is inserted inside the column (7), and its lower end is hinged to the adapter (5) through the column through hole (71) on the side of the column (7).

3. The clutch traction device according to claim 2, characterized in that: The frame (6) is provided with a base (61) on the side wall for connecting the lower end of the column (7), and the base (61) has a base through hole (611) on the side wall; The adapter assembly (5) is installed inside the base (61); The lower end of the first connecting rod (3) passes through the column through hole (71) and the base through hole (611) in sequence and is hinged to the adapter assembly (5).

4. The clutch traction device according to any one of claims 1-3, characterized in that: The adapter assembly (5) also includes a fixing plate (52), which is fixed on the frame (6), and the movable seat (51) is rotatably mounted on the fixing plate (52).

5. The clutch traction device according to claim 4, characterized in that: The movable seat (51) has a triangular cross section, one end of which is hinged to the fixed plate (52), and the other two ends are respectively provided with a first hinge hole (511) and a second hinge hole (512). The lower end of the first connecting rod (3) is hinged to the first hinge hole (511), and the beginning end of the second connecting rod (4) is hinged to the second hinge hole (512).

6. The clutch traction device according to claim 1, characterized in that: The clutch fork (2) includes: The shift fork seat (21) is fixed on the frame (6); The pivot (22) is rotatably mounted on the shift fork seat (21); The clutch lever (23) is mounted on the rotating shaft (22); Connecting plate (24) connects clutch lever (23) and clutch wheel bushing (9); The end of the second connecting rod (4) is connected to the rotating shaft (22); When the second connecting rod (4) drives the rotating shaft (22) to rotate, the clutch lever (23) rotates with the rotating shaft (22) and drives the clutch wheel bushing (9) to move axially through the connecting plate (24).

7. The clutch traction device according to claim 6, characterized in that: There are two clutch levers (23), which are respectively sleeved on the rotating shaft (22), and the ends of the two clutch levers (23) are connected to the same connecting plate (24).

8. The clutch traction device according to claim 6 or 7, characterized in that: One end of the rotating shaft (22) extends out of the shift fork seat (21), and a drive rocker arm assembly (25) is fixedly connected to the extended section; The end of the second connecting rod (4) is connected to the drive swing arm assembly (25), which drives the rotating shaft (22) to rotate.

9. The clutch traction device according to claim 8, characterized in that: The drive lever assembly (25) includes: The drive lever (251) is fixed to the extended end of the rotating shaft (22); The clamp (252) is fixedly connected to the movable end of the drive lever (251); The end of the second connecting rod (4) is rotatably positioned between the clamping plate (252) and the driving swing rod (251).

10. A treadmill, characterized in that: Includes the clutch traction device as described in any one of claims 1-9.

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