strength training machine

Abstract

The present invention discloses a strength training machine, including a damping unit, the damping unit including a first winding wheel and a second winding wheel, a first pull rope wound around the first winding wheel, a second pull rope wound around the second winding wheel, the first winding wheel, a differential and the second winding wheel are sequentially sleeved on the outer circumference of the output shaft of the motor of the damping unit along the length direction, the first winding wheel and the second winding wheel can rotate relative to the output shaft, the differential is connected to the output shaft, and the differential is respectively connected to the first winding wheel and the second winding wheel. The differential can transmit the damping power of the motor to the first winding wheel and the second winding wheel respectively, thereby reducing the number of motors in the strength training machine; by arranging the differential to be sleeved on the outer circumference of the output shaft, so that the differential and the output shaft are directly connected, the power loss between the motor and the differential can be reduced, and the power transmission efficiency in the damping unit can be improved.

Description

Technical Field

[0001] The present invention relates to the field of fitness equipment, in particular to a strength training machine. Background Art

[0002] To achieve compact size and multifunctionality for use in various settings, including at home, strength training equipment typically uses a motor (or other resistance sources such as magnetic control, friction, or springs) as the resistance source. Two resistance sources are typically provided, outputting resistance from either end of the equipment to achieve a variety of training movements, such as double-arm and single-arm training, to achieve strength training. The need for two motors increases the cost of these strength training machines. The two motors also result in inconsistent pulling force between the two arms during double-arm training, making control of the equipment more difficult. Summary of the Invention

[0003] The purpose of the embodiment of the present invention is to provide a strength training machine with low cost and good pulling force consistency of both arms during double-arm training.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A strength training machine is provided, comprising a damping unit, wherein the damping unit comprises a first winding wheel and a second winding wheel, a first pull rope is wound around the first winding wheel, and a second pull rope is wound around the second winding wheel, the damping unit also comprises a motor and a differential, the first winding wheel, the differential and the second winding wheel are sequentially arranged on the outer circumference of the output shaft of the motor along the length direction of the output shaft, the first winding wheel and the second winding wheel can rotate relative to the output shaft, the differential is connected to the output shaft, the output shaft drives the differential to rotate, and the differential is respectively connected to the first winding wheel and the second winding wheel for transmission.

[0006] Beneficial effects: By setting a differential, the damping power of the motor can be transmitted to the first winding wheel and the second winding wheel respectively, reducing the number of motors of the strength training machine and reducing the cost of the strength training machine; the setting of the differential allows the strength training machine to perform single-arm training and double-arm training, that is, the first pull rope or the second pull rope can be pulled separately, or the first pull rope and the second pull rope can be pulled at the same time; by setting a direct connection between the differential and the output shaft, the power loss between the motor and the differential can be reduced, and the power transmission efficiency in the damping unit can be improved, which can reduce the power of the motor and thus reduce the cost of the strength training machine; by setting the first winding wheel, the differential and the second winding wheel to be sequentially sleeved on the output shaft, the structure of the damping unit can be made compact, thereby improving the space utilization inside the strength training machine, or reducing the space occupied by the entire strength training machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0008] Figure 1 Schematic diagram of the damping unit according to an embodiment of the present invention (the support and motor are not shown).

[0009] Figure 2 This is a schematic diagram of the decomposition of the damping unit according to an embodiment of the present invention (the support and the motor are not shown).

[0010] Figure 3 This is a schematic diagram of the decomposition of the damping unit according to an embodiment of the present invention.

[0011] Figure 4 for Figure 3 A magnified schematic diagram of .

[0012] Figure 5 Schematic diagram of the strength training machine according to an embodiment of the present invention.

[0013] Figure 6 Schematic diagram of the universal guide sleeve according to an embodiment of the present invention.

[0014] In the picture:

[0015] 100, damping unit; 200, frame; 300, first handle; 400, second handle; 500, limit plate; 5001, universal guide sleeve; 5002, speaker hole; 600, first limit block; 700, second limit block; 800, redirecting pulley;

[0016] 1. First winding wheel; 2. Second winding wheel; 3. Differential; 31. First transmission wheel assembly; 311. First driven wheel; 312. First pulley; 313. First transmission belt; 32. Second transmission wheel assembly; 321. Second driven wheel; 322. Second transmission belt; 323. Second pulley; 324. Redirection pulley; 33. Transmission wheel frame; 331. Frame body; 3311. First mounting hole; 332. Mounting position; 333. Reinforcement rib; 34. First rotating shaft; 35. Second rotating shaft; 4. Output shaft; 5. Motor; 6. Support; 61. First slot wall; 62. Second slot wall; 621. Third mounting hole; 63. Mounting slot; 7. Bearing sleeve; 8. Positioning sleeve; 9. First pull rope; 10. Second pull rope. DETAILED DESCRIPTION

[0017] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0018] like Figures 1 to 3 、 Figure 5 As shown, the present invention provides a strength training machine, including a damping unit 100, which includes a first winding wheel 1, a second winding wheel 2, a motor 5 and a differential 3. A first pull rope 9 is wound around the first winding wheel 1, and a second pull rope 10 is wound around the second winding wheel 2. The first winding wheel 1, the differential 3 and the second winding wheel 2 are sequentially sleeved on the outer periphery of the output shaft 4 of the motor 5 along the length direction of the output shaft 4 of the motor 5. The first winding wheel 1 and the second winding wheel 2 can rotate relative to the output shaft 4. The differential 3 is connected to the output shaft 4, and the output shaft 4 drives the differential 3 to rotate. The differential 3 is respectively connected to the first winding wheel 1 and the second winding wheel 2 in a transmission connection. In this embodiment, the first winding wheel 1 and the second winding wheel 2 are rotatably connected to the output shaft 4. By setting the differential 3, the damping power of the motor 5 can be transmitted to the first winding wheel 1 and the second winding wheel 2 respectively, which reduces the number of motors 5 of the strength training machine and reduces the cost of the strength training machine. The setting of the differential 3 allows the strength training machine to perform single-arm training and double-arm training, that is, the first pull rope 9 or the second pull rope 10 can be pulled separately, or the first pull rope 9 and the second pull rope 10 can be pulled at the same time. When the pulling speeds of the first pull rope 9 and the second pull rope 10 are equal, the torque applied to the first winding wheel 1 by the output shaft 4 and the torque applied to the output shaft 4 are equal. The torque applied to the second winding wheel 2 is equal; by arranging a direct connection between the differential 3 and the output shaft 4, the power loss between the motor 5 and the differential 3 can be reduced, and the power transmission efficiency in the damping unit 100 can be improved, which can reduce the power of the motor 5 and thus reduce the cost of the strength training machine; by sequentially arranging the first winding wheel 1, the differential 3 and the second winding wheel 2 on the output shaft 4, the structure of the damping unit 100 can be made compact, thereby improving the space utilization inside the strength training machine, or reducing the space occupied by the entire strength training machine.

[0019] In this embodiment, when the first and second pull ropes 9 and 10 are pulled, the power provided by the motor 5 is damping power, that is, the power of the motor 5 increases the difficulty of pulling the first and second pull ropes 9 and 10; when the first and second pull ropes 9 and 10 are recovered, the power provided by the motor 5 is recovery power, that is, the power of the motor 5 causes the first and second reels 1 and 2 to rotate, so that the first and second pull ropes 9 and 10 are respectively wound around the first and second reels 1 and 2. In the above-mentioned pulling state and recovery state, the output shaft 4, the first and second reels 1 and 2 rotate in opposite directions.

[0020] Reference Figure 1 and Figure 2 Specifically, the differential 3 includes a transmission wheel frame 33, a first transmission wheel assembly 31, and a second transmission wheel assembly 32. The transmission wheel frame 33 is connected to the output shaft 4 so that the output shaft 4 drives the transmission wheel frame 33 to rotate about the axis of the output shaft 4. The first transmission wheel assembly 31 and the second transmission wheel assembly 32 are mounted on opposite sides of the transmission wheel frame 33. The first transmission wheel assembly 31 is in transmission connection with the first winding reel 1, and the second transmission wheel assembly 32 is in transmission connection with the second winding reel 2. In this embodiment, by having two sets of transmission wheel assemblies in transmission connection with the first winding reel 1 and the second winding reel 2, respectively, the resistance of the output shaft 4 can be transmitted to the first winding reel 1 solely through the first transmission wheel assembly 31, and the resistance of the output shaft 4 can be transmitted to the second winding reel 2 solely through the second transmission wheel assembly 32. This reduces the mutual influence between the first winding reel 1 and the second winding reel 2, enables the first and second pull ropes 9 and 10 to be pulled independently, and improves the training effect.

[0021] In this embodiment, the first transmission wheel assembly 31 and the second transmission wheel assembly 32 are both transmission pulley assemblies. It can be understood that the transmission pulley is suitable for transmission with a close center distance between the two shafts, and the power loss between the motor 5 and the differential 3 in this embodiment is small, so a small-power motor 5 can be used, that is, the size of the motor 5 is small. In this case, the size of the differential 3 can be reduced accordingly to meet the use conditions of the transmission pulley; the transmission pulley has the advantages of low noise during transmission and flexible speed and direction changes during operation. In this embodiment, the output shaft 4, the first winding wheel 1 and the second winding wheel 2 in the pulling state have opposite rotation directions to the output shaft 4, the first winding wheel 1 and the second winding wheel 2 in the recovery state, and it is easy to have inconsistent tensions in the first pull rope 9 and the second pull rope 10. Therefore, this embodiment transmits power in the form of a transmission pulley, and the power provided by the motor 5 can be smoothly transmitted to the first winding wheel 1 and the second winding wheel 2, which not only reduces the difficulty of controlling the strength training machine, but also enables the first winding wheel 1 and the second winding wheel 2 to quickly realize the action of recovering the pull rope, thereby improving the training experience of the trainee; the transmission pulley has a simple structure and is easy to use and maintain, which can reduce the use and maintenance cost of the strength training machine. Pulley transmission also has the following advantages: 1. Compared with bevel gears, pulleys are easier to process and have lower precision requirements; 2. Compared with gear transmission, pulley transmission has lower requirements for assembly precision, lower installation difficulty, and better overall reliability.

[0022] In another embodiment, the first transmission wheel assembly 31 and the second transmission wheel assembly 32 can also be a transmission sprocket assembly. It can be understood that when the tension of the transmission belt is too large, the transmission belt is prone to breakage, and the tension of the transmission belt needs to be adjusted to keep the transmission belt taut and maintain the transmission effect. The chain transmission utilizes the teeth and grooves of the sprocket and the chain. Therefore, the transmission sprocket assembly does not require additional adjustment of the chain tension, and the chain is mostly made of metal, so the chain is not prone to breakage. Therefore, the strength training machine made of the transmission sprocket assembly has a larger strength training range.

[0023] Reference Figure 3 and Figure 4Specifically, the first transmission wheel assembly 31 includes a first driven wheel 311, a first pulley 312 and a first transmission belt 313. The first driven wheel 311 is fixedly connected to the first winding wheel 1. The first pulley 312 is rotatably arranged on the transmission wheel frame 33. The inner surface of the first transmission belt 313 is pressed against the outer periphery of the first driven wheel 311 and the first pulley 312. The second transmission wheel assembly 32 includes a second driven wheel 321, a second transmission belt 322, a second pulley 323 and at least one redirecting pulley 324. In this embodiment, the redirecting pulley 324 There are two of them, the second driven pulley 321 is connected to the second winding wheel 2, the second pulley 323 and the redirecting pulley 324 are both rotatably set on the transmission pulley frame 33, and the second pulley 323 and the redirecting pulley 324 are set at intervals, the inner surface of the second transmission belt 322 is pressed against the outer periphery of the second pulley 323 and the outer periphery of the redirecting pulley 324, the outer surface of the second transmission belt 322 is pressed against the outer periphery of the second driven pulley 321, and the second pulley 323 and the first pulley 312 rotate at the same time. The cooperation between the first pulley 312, the second pulley 323, the redirecting pulley 324, the first transmission belt 313 and the second transmission belt 322 can transmit the power provided by the motor 5 to the first winding wheel 1 and the second winding wheel 2 respectively, thereby increasing the pulling resistance of the first pull rope 9 and the second pull rope 10, improving the training effect, so that the first pull rope 9 and the second pull rope 10 can be pulled smoothly; the setting of the redirecting pulley 324 not only allows the outer surface of the second transmission belt 322 to be sleeved on the outer periphery of the second driven wheel 321, but also ensures that the second transmission belt 322 remains tensioned, reduces the slippage between the second transmission belt 322, the second driven wheel 321 and the second pulley 323, and reduces the power transmission loss. Of course, three, four or even more redirecting pulleys 324 can be provided according to the size of the differential 3, so that the second transmission belt 322 is kept taut and the second transmission wheel assembly 32 can run smoothly. When the size of the differential 3 is large, the first transmission wheel assembly 31 can also be provided with a tensioning pulley to ensure the tension of the first transmission belt 313.

[0024] In one embodiment, only one bend pulley 324 may be provided. In this case, the second driven pulley 321 is located between the bend pulley 324 and the second pulley 323. However, the second driven pulley 321 is offset from the connecting line between the bend pulley 324 and the second pulley 323. This allows the second drive belt 322 to form a wrap angle around the second driven pulley 321, thereby operating the differential 3. In this embodiment, two bend pulleys 324 are used. The two bend pulleys 324 and the second pulley 323 form a triangular structure, which improves the overall balance of the second drive pulley assembly 32 and ensures more uniform force distribution.

[0025] Specifically, the transmission wheel frame 33 is provided with a first rotating shaft 34 and a second rotating shaft 35. Both the first rotating shaft 34 and the second rotating shaft 35 are rotatably connected to the transmission wheel frame 33, with the number of second rotating shafts 35 corresponding to the number of redirecting pulleys 324. The first rotating shaft 34 is fixedly connected to the first pulley 312 and the second pulley 323 at both ends, respectively. The end of the second rotating shaft 35 remote from the transmission wheel frame 33 is fixedly connected to the redirecting pulley 324. The first and second pulleys 312, 323 are connected by the same first rotating shaft 34, which allows the first and second pulleys 312, 323 to rotate synchronously, thereby interlocking the first and second transmission wheel assemblies 31, 32 and ensuring the effective operation of the differential 3. In other embodiments, the second rotating shaft 35 may be fixedly connected to the transmission wheel frame 33. In this case, the second rotating shaft 35 and the redirecting pulley 324 need to be rotatable, i.e., the end of the second rotating shaft 35 remote from the transmission wheel frame 33 is rotatably connected to the redirecting pulley 324.

[0026] Specifically, the first driven pulley 311 and the first pulley 312 are both synchronous pulleys, and the first transmission belt 313 is a synchronous toothed belt. During rotation, the teeth and grooves on the first driven pulley 311, the first pulley 312, and the first transmission belt 313 mesh to transmit motion and power, forming a meshing transmission with the following advantages: 1. Since the synchronous pulleys do not require additional drilling or keyway drawing processes, they are convenient and easy to install and adjust, saving time and effort. 2. The synchronous pulleys have high precision and high torque, eliminating the worry of loosening during transmission, and the transmission accuracy is also very precise, with no backlash. 3. The synchronous pulleys and synchronous toothed belt are used in conjunction with each other to provide a buffer during operation, reducing vibration and maintaining smooth operation. 4. The synchronous pulleys and synchronous toothed belt have a high degree of fit, resulting in low noise during operation. Of course, the second driven pulley 321, the second pulley 323, and the redirecting pulley 324 can also be synchronous pulleys, with the second transmission belt 322 being a synchronous toothed belt.

[0027] Preferably, the transmission wheel frame 33 is provided with a tensioning member (not shown) for adjusting the distance between the first and second rotating shafts 34, 35, and between two adjacent second rotating shafts 35. In one embodiment, the tensioning member is part of the transmission wheel frame 33 and can be positioned in the middle of the transmission wheel frame 33 to adjust the spacing between the rotating shafts. In another embodiment, the tensioning member can be a separate component from the transmission wheel frame 33, with the first and second rotating shafts 34, 35 connected to the transmission wheel frame 33 via the tensioning member. The provision of the tensioning member allows the tensioning of the first and second transmission belts 313, 322 to be adjusted by adjusting the distance between the first and second rotating shafts 34, 35, thereby improving the transmission efficiency of the first and second transmission wheel assemblies 31, 32. In other embodiments, a single tensioning member can be provided to adjust the first and second rotating shafts 34, 35 independently, thereby reducing costs. Alternatively, two, three, or even more tensioning members can be provided to increase the number of adjustable rotating shafts, thereby improving transmission efficiency.

[0028] Reference Figure 4 The first and second mounting holes 3311 are provided on the inner wall of the first mounting hole 3311 so as to prevent the motor 5 from sliding into the locking cam 331. The first and second mounting holes 3311 are provided on the inner wall of the first mounting hole 3311 so as to prevent the motor 5 from sliding into the locking cam 331. The number of must match the number of the first rotating shaft 34 and the second rotating shaft 35. By setting the mounting position 332 annularly arranged around the first mounting hole 3311, the force on the frame body 331 can be balanced, thereby balancing the force on the output shaft 4 and preventing the output shaft 4 from getting stuck.

[0029] Specifically, two adjacent mounting positions 332 are connected by reinforcing ribs 333 , which can improve the strength of the transmission wheel frame 33 and prevent the axle spacing between the transmission wheels from changing, thereby ensuring that the differential 3 can operate stably.

[0030] Reference Figure 5The strength training machine includes a frame 200, a damping unit 100 mounted on the frame 200, and at least two redirecting pulleys 800 disposed on the frame 200. The end of the first pull rope 9 away from the damping unit 100 passes over one of the redirecting pulleys 800 and is connected to the first handle 300. The end of the second pull rope 10 away from the damping unit 100 passes over the other redirecting pulley 800 and is connected to the second handle 400. By providing the redirecting pulleys 800, the directions of the first and second pull ropes 9, 10 can be adjusted, allowing the first and second pull ropes 9, 10 to adapt to the direction of the trainee's pulling force, thereby improving the trainee's training experience.

[0031] Preferably, the redirecting pulley 800 is a universal wheel. If the diameter of the first winding wheel 1 and the second winding wheel 2 is too large, it will be detrimental to the rotation of the first winding wheel 1 and the second winding wheel 2. In order to reduce the diameter of the first winding wheel 1 and the second winding wheel 2 after winding, it is necessary to increase the thickness of the first winding wheel 1 and the second winding wheel 2, and wind the first pull rope 9 and the second pull rope 10 side by side along the thickness direction of the first winding wheel 1 and the second winding wheel 2, respectively, to provide winding space for the first pull rope 9 and the second pull rope 10. Due to the large thickness of the first winding wheel 1 and the second winding wheel 2, the pulling direction of the first pull rope 9 and the second pull rope 10 will be deflected. By setting the redirecting pulley 800 as a universal wheel, the redirecting pulley 800 can adjust its own angle to adapt to the pulling direction of the first pull rope 9 and the second pull rope 10, avoiding the phenomenon of the first pull rope 9 and the second pull rope 10 being stuck due to excessive friction between the redirecting pulley 800 and the first pull rope 9 and the second pull rope 10, thereby improving the training experience of the trainee.

[0032] Specifically, a limit plate 500 is provided on the frame 200, and a universal guide sleeve 5001 is provided on the limit plate 500. Figure 6A trumpet hole 5002 is provided in the universal guide sleeve 5001, and the trumpet hole 5002 passes through both ends of the universal guide sleeve 5001. The size of the trumpet hole 5002 at both ends is larger than the size of the middle part of the trumpet hole 5002. The redirection pulley 800 is adjacent to the universal guide sleeve 5001. A first limit block 600 is provided between the first pull rope 9 and the first handle 300. The first pull rope 9 is connected to the first handle 300 through the first limit block 600. The first pull rope 9 passes through the trumpet hole 5002 and is connected to the first limit block 600. The size of the first limit block 600 is larger than the size of the smallest part of the trumpet hole 5002 of the universal guide sleeve 5001. The second pull rope 10 is connected to the second handle 400 through the second limit block 700. The second pull rope 10 passes through the trumpet hole 500 2 and the second limiting block 700 are connected. The size of the second limiting block 700 is larger than the size of the smallest part of the horn hole 5002 of the universal guide sleeve 5001. By providing the first limiting block 600, the second limiting block 700 and the universal guide sleeve 5001, when the first and second pull ropes 9 and 10 are retracted to a certain length, the first limiting block 600 and the second limiting block 700 can be tightly pressed against the smallest part of the horn hole 5002, preventing the first and second pull ropes 9 and 10 from being completely wrapped around the first and second winding reels 1 and 2. In this embodiment, two limiting plates 500 are respectively provided corresponding to the first and second pull ropes 9 and 10. The second limiting block 700 and the first limiting block 600 are spherical, and the diameters of the second limiting block 700 and the first limiting block 600 are larger than the diameters of the horn hole 5002 of the universal guide sleeve 5001. By providing the universal guide sleeve 5001 , the speaker hole 5002 can be easily processed, thereby making the hole wall of the speaker hole 5002 smooth, and reducing the resistance and noise caused by friction when the first pull rope 9 and the second pull rope 10 are pulled.

[0033] Specifically, the damping unit 100 includes a support 6, one side of which is connected to the frame 200. The other side of the support 6 is provided with a mounting groove 63. The mounting groove 63 has a first groove wall 61 and a second groove wall 62 arranged opposite each other. The motor 5 is disposed on the first groove wall 61. The output shaft 4 is rotatably connected to the second groove wall 62 at one end away from the motor 5. The first winding reel 1, the second winding reel 2, and the differential 3 are all disposed within the mounting groove 63. By providing the support 6, the support 6 can support the damping unit 100 and also provide a connection between the damping unit 100 and the frame 200, facilitating assembly of the strength training machine.

[0034] Reference Figure 3 Specifically, the first groove wall 61 of the support 6 is provided with a second mounting hole, the second groove wall 62 is provided with a third mounting hole 621, the motor 5 is partially provided in the mounting groove 63, the output shaft 4 of the motor 5 is inserted into the first mounting hole 3311 from the second mounting hole, and the end of the output shaft 4 away from the motor 5 is connected through the bearing sleeve 7 and the hole wall of the third mounting hole 621, and the output shaft 4 and the bearing sleeve 7 are hinged.

[0035] Reference Figure 3 Specifically, the first winding wheel and the second winding wheel are respectively connected to the output shaft 4 through bearings, and a positioning sleeve 8 is provided on the end of the output shaft 4 away from the motor 5 to achieve a positioning connection between the first winding wheel 1, the differential 3 and the second winding wheel 2, limit the axial movement of the first winding wheel 1, the differential 3 and the second winding wheel 2 along the output shaft 4, and avoid shaking between the first winding wheel 1, the differential 3 and the second winding wheel 2. In other embodiments, a limiting structure can also be provided on the output shaft 4. For example, a step surface can be provided at one end of the output shaft 4 to abut against the bearing of the first winding wheel 1. A gasket or other limiting structure can be provided between the first winding wheel 1 and the transmission wheel frame 33, and between the transmission wheel frame 33 and the second winding wheel 2. The positioning sleeve 8 is provided on the side of the second winding wheel 2 away from the transmission wheel frame 33, so that the end face of the positioning sleeve 8 is tightly abutted against the bearing of the second winding wheel 2.

[0036] In this embodiment, when the user performs double-arm training, the user pulls the first pull rope 9 and the second pull rope 10 at the same time. When the tension of the first pull rope 9 and the second pull rope 10 is consistent, that is, the rotation speed of the first winding wheel 1 and the second winding wheel 2 is consistent, the first pulley 312, the second pulley 323 and the redirecting pulley 324 only rotate around the output shaft 4 with the transmission wheel frame 33, and the first pulley 312, the second pulley 323 and the redirecting pulley 324 do not rotate on their own. When the tension of the first pull rope 9 and the second pull rope 10 is inconsistent, that is, there is a rotation speed difference between the first winding wheel 1 and the second winding wheel 2, the first pulley 312, the second pulley 323 and the redirecting pulley 324 rotate around the output shaft 4 while rotating with the transmission wheel frame 33, that is, the first pulley 312 and the second pulley 323 rotate around the output shaft 4. While rotating, it also rotates around the first rotating shaft 34. While the redirecting pulley 324 rotates around the output shaft 4, it also rotates around the second rotating shaft 35, so that the first pull rope 9 and the second pull rope 10 can both remain tensioned. When the user performs single-arm training, for example, the user pulls the first pull rope 9 alone, and the tension of the first pull rope 9 is transmitted to the second pull rope 2 through the first winding wheel 1 and the differential 3, so that the second winding wheel 2 has a tendency to rotate, and the direction of the second winding wheel 2 rotation tendency is the same as the rotation direction of the first winding wheel 1. At this time, under the limiting action of the limiting plate 500 and the second limiting block 700, the second pull rope 10 is in a taut state and the second winding wheel 2 cannot rotate. Due to the setting of the differential 3, the rotation of the first winding wheel 1 and the second winding wheel 2 can be independent of each other and do not affect each other, so the user can achieve unilateral strength training. The situation where the user pulls the second pull rope 10 alone is similar to the situation where the user pulls the first pull rope 9 alone, and will not be repeated here.

Claims

1. A strength training machine, comprising a damping unit, wherein the damping unit comprises a first winding wheel and a second winding wheel, wherein a first pull rope is wound around the first winding wheel and a second pull rope is wound around the second winding wheel, wherein: The damping unit also includes a motor and a differential. The first winding wheel, the differential and the second winding wheel are sequentially arranged on the outer circumference of the output shaft along the length direction of the output shaft of the motor. The first winding wheel and the second winding wheel can rotate relative to the output shaft. The differential is connected to the output shaft, and the output shaft drives the differential to rotate. The differential is respectively connected to the first winding wheel and the second winding wheel.

2. The strength training machine according to claim 1, characterized in that: The differential includes a transmission wheel frame, a first transmission wheel assembly and a second transmission wheel assembly. The transmission wheel frame is connected to the output shaft so that the output shaft drives the transmission wheel frame to rotate around the axis of the output shaft. The first transmission wheel assembly and the second transmission wheel assembly are respectively installed on opposite sides of the transmission wheel frame. The first transmission wheel assembly is in transmission connection with the first winding wheel, and the second transmission wheel assembly is in transmission connection with the second winding wheel.

3. The strength training machine according to claim 2, characterized in that: The first transmission wheel assembly and / or the second transmission wheel assembly is a transmission belt pulley assembly or a transmission sprocket assembly.

4. The strength training machine according to claim 3, characterized in that: The first transmission wheel assembly includes a first driven wheel, a first pulley and a first transmission belt, the first driven wheel and the first winding wheel are fixedly connected, the first pulley is rotatably arranged on the transmission wheel frame, and the inner surface of the first transmission belt is tightly pressed against the outer periphery of the first driven wheel and the outer periphery of the first pulley; The second transmission wheel assembly includes a second driven wheel, a second transmission belt, a second pulley and a redirecting pulley. The second driven wheel and the second winding wheel are fixedly connected. The second pulley and the redirecting pulley are both rotatably arranged on the transmission wheel frame, and the second pulley and the redirecting pulley are spaced apart. The inner surface of the second transmission belt is pressed against the outer periphery of the second pulley and the outer periphery of the redirecting pulley, and the outer surface of the second transmission belt is pressed against the outer periphery of the second driven wheel. The second pulley and the first pulley rotate simultaneously.

5. The strength training machine according to claim 4, characterized in that: The first driven wheel and the first pulley are both synchronous pulleys, and the first transmission belt is a synchronous toothed belt; and / or, The second driven wheel, the second pulley, and the redirecting pulley are all synchronous pulleys, and the second transmission belt is a synchronous toothed belt.

6. The strength training machine according to claim 4, characterized in that: The transmission wheel frame is provided with a first rotating shaft and a second rotating shaft. The two ends of the first rotating shaft are respectively connected to the first pulley and the second pulley, and the second rotating shaft is connected to the redirecting pulley.

7. The strength training machine according to claim 6, characterized in that: The transmission wheel frame is provided with a tensioning member, and the tensioning member is used to adjust the distance between the first rotating shaft and the second rotating shaft.

8. The strength training machine according to claim 6, characterized in that: The transmission wheel frame includes a frame body, a first mounting hole is provided in the middle of the frame body, the output shaft passes through the first mounting hole and is fixed to the frame body, and at least two mounting positions are provided along the periphery of the first mounting hole, and the mounting positions are used to install the first rotating shaft or the second rotating shaft.

9. The strength training machine according to claim 8, characterized in that: Two adjacent installation positions are connected by reinforcing ribs.

10. The strength training machine according to any one of claims 1 to 9, characterized in that: The invention comprises a frame, the damping unit is arranged on the frame, and at least two redirecting pulleys are arranged on the frame. The end of the first pull rope away from the damping unit passes around one of the redirecting pulleys and is connected to the first handle, and the end of the second pull rope away from the damping unit passes around the other redirecting pulley and is connected to the second handle.

11. The strength training machine according to claim 10, characterized in that: The redirecting pulley is a universal wheel.

12. The strength training machine according to claim 10, characterized in that: A limit plate is provided on the frame, a universal guide sleeve is provided on the limit plate, a trumpet hole is provided in the universal guide sleeve, the trumpet hole passes through both ends of the universal guide sleeve, the dimensions of both ends of the trumpet hole are larger than the dimension of the middle part of the trumpet hole, the redirecting pulley is adjacent to the trumpet hole, the first pull rope is connected to the first handle through a first limit block, the first pull rope passes through the trumpet hole and is connected to the first limit block, the dimension of the first limit block is larger than the dimension of the smallest part of the trumpet hole; and / or, The second pull rope is connected to the second handle through a second limiting block, and the second pull rope passes through the universal guide sleeve and is connected to the second limiting block. The size of the second limiting block is larger than the minimum size of the horn hole.

13. The strength training machine according to claim 10, characterized in that: The damping unit includes a support, one side of the support is connected to the frame, and the other side of the support is provided with a mounting groove, the mounting groove has a first groove wall and a second groove wall opposite to each other, the motor is arranged on the first groove wall, the output shaft is rotatably connected to the second groove wall at one end away from the motor, and the first winding wheel, the second winding wheel and the differential are all arranged in the mounting groove.

14. The strength training machine according to claim 1, characterized in that: The first winding wheel and the second winding wheel are rotatably connected to the output shaft through bearings respectively. A positioning sleeve or a limiting structure is provided on the output shaft. The positioning sleeve or the limiting structure is used to limit the axial movement of the first winding wheel, the differential and the second winding wheel.

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