Resistance transmission device and fitness equipment

Abstract

This application provides a resistance transmission device and fitness equipment. The resistance transmission device includes: a drive source, a reducer, a rotating shaft, an inner cylinder, and a rope winding drum. Torque is provided by rotating the output shaft of the drive source. The reducer includes a reducer housing and an input end and an output end located at both ends of the reducer housing. The input end is connected to the output shaft of the drive source. The rotating shaft is synchronously connected to the output end of the reducer. The inner cylinder is sleeved outside the reducer housing and fixedly connected to it. The outer circumference of the rope winding drum is used to wind the pull rope. The rope winding drum rotates synchronously with the rotating shaft and can slide along the axial direction of the rotating shaft. The rope winding drum is sleeved outside the inner cylinder, and the inner surface of the rope winding drum and the outer surface of the inner cylinder are in helical drive engagement. By optimizing the pull rope winding structure, the pull rope is wound and unwound in an orderly manner. Combined with the reducer, this increases the output resistance, which is beneficial for improving training effectiveness.

Description

Technical Field

[0001] This application belongs to the field of fitness equipment technology, and in particular relates to a resistance transmission device and fitness equipment. Background Technology

[0002] Among various fitness equipment, rope-based strength training devices have become mainstream products in the market due to their flexible training modes and portability. Traditional rope training equipment provides training resistance to users through pulley systems, ropes, and resistance bands to meet their training needs. With the intelligent development of fitness equipment, some devices have introduced motor-driven systems to achieve dynamic resistance adjustment, providing more diverse training modes and significantly improving the user experience.

[0003] However, in the aforementioned motor-driven equipment, the pull rope is directly wound around the motor's output shaft during the rope extension and retraction process. Due to the limited diameter and length of the motor's output shaft, the length of the pull rope is restricted, and uneven winding, knotting, or stacking of the rope is highly likely. This not only affects the equipment's lifespan but may also cause the rope to break due to excessive localized stress, creating a safety hazard. While existing technologies have proposed rope winding devices, their structures are relatively complex, and the trend towards miniaturization limits the motor's size, resulting in insufficient output resistance and impacting actual training effectiveness. Utility Model Content

[0004] To address at least one shortcoming in the related technologies, this application provides a resistance transmission device and fitness equipment, which optimizes the rope winding structure to ensure orderly rope winding and unwinding. Combined with a speed reducer, this increases the output resistance, thereby improving training effectiveness.

[0005] This application provides a resistance transmission device, including: a drive source, a reducer, a rotating shaft, an inner cylinder, and a rope winding drum; the output shaft of the drive source rotates to provide torque; the reducer includes a reducer housing and an input end and an output end located at both ends of the reducer housing, the input end being connected to the output shaft of the drive source; the rotating shaft is synchronously rotatably connected to the output end of the reducer; the inner cylinder is sleeved outside the reducer housing and fixedly connected to the reducer housing; the outer circumference of the rope winding drum is used to wind a pull rope, the rope winding drum rotates synchronously with the rotating shaft, and the rope winding drum can slide along the axial direction of the rotating shaft; the rope winding drum is sleeved outside the inner cylinder, and the inner surface of the rope winding drum is helically driven with the outer surface of the inner cylinder to convert the rotation of the rope winding drum into sliding along the axial direction of the rotating shaft.

[0006] In some embodiments, one end of the inner cylinder extends radially inward to form an assembly portion, the inner surface of which abuts against and is fixedly connected to the outer surface of the end of the reducer housing.

[0007] In some embodiments, the output end of the reducer is provided with a reducer output shaft, which is synchronously connected to the rotating shaft, and the output shaft of the drive source, the reducer output shaft, and the rotating shaft are coaxially arranged.

[0008] In some embodiments, the reducer housing defines an inner chamber, the inner wall surface of which is provided with internal teeth to form an internal gear ring; a central gear and a plurality of planetary gears are provided in the inner chamber, the central gear is synchronously rotatably connected to the output shaft of the drive source, and each planetary gear meshes with both the central gear and the internal gear ring; the reducer also includes an output flange, the outer side of which is fixedly connected to the reducer output shaft, and the inner side of which is provided with a plurality of planetary shafts corresponding to the plurality of planetary gears, each planetary shaft being rotatably connected to the center of the corresponding planetary gear.

[0009] In some embodiments, an axially extending external spline is formed on the outer surface of the rotating shaft; the end of the rope drum away from the drive source extends radially inward to form a mating end face, the mating end face has an assembly hole for the rotating shaft to pass through, and an axially extending internal spline is provided at the assembly hole, the internal spline being adapted to the external spline so that the rope drum rotates synchronously with the rotating shaft.

[0010] In some embodiments, the resistance transmission device further includes a mounting frame, which includes a first side plate and a second side plate disposed opposite to each other and a connecting plate connecting the first side plate and the second side plate; a drive source is mounted on the first side plate; and the end of the rotating shaft away from the reducer is rotatably mounted on the second side plate.

[0011] In some embodiments, the resistance transmission device further includes a plurality of limiting members and a fixing seat; the plurality of limiting members extend axially along the winding drum and are distributed circumferentially around the winding drum, forming a winding space between the plurality of limiting members and the winding drum, the winding space being configured to allow only a single layer of pull rope to be wound on the winding drum; each limiting member includes a limiting rod and limiting portions located at both ends of the limiting rod; the fixing seat is located on the side of the winding drum away from the second side plate, and a plurality of first mounting holes are provided on the fixing seat corresponding to the plurality of limiting members; a plurality of second mounting holes are provided on the second side plate corresponding to the plurality of limiting members; the size of the first mounting holes and the second mounting holes is larger than the size of the limiting rod and smaller than the size of the limiting portions; the limiting rod is located between the fixing seat and the second side plate, the two ends of the limiting rod passing through the first mounting holes and the second mounting holes respectively, and the limiting portions at both ends of the limiting rod are located on opposite sides of the fixing seat and the second side plate, so as to rotatably mount the limiting rod between the fixing seat and the second side plate.

[0012] In some embodiments, the end face of the rope winding drum is provided with a plurality of rope holes near the outer periphery, and the plurality of rope holes are evenly distributed along the circumference of the end face; the end of the pull rope passes through the plurality of rope holes in sequence and is knotted at the end to fix the end of the pull rope to the rope winding drum.

[0013] In some embodiments, the connecting plate is provided with a guide portion for the pull rope to be led outward along the tangential direction of the rope drum through the guide portion.

[0014] This application also provides a fitness device including the resistance transmission device as described in any of the preceding claims.

[0015] Compared with the prior art, this application has at least the following advantages:

[0016] (1) The resistance transmission device provided in at least one embodiment of this application provides a winding base for the pull rope through the rope winding drum. Since the diameter of the rope winding drum can be designed according to the required length of the pull rope, the problem of the pull rope being directly wound on the output shaft of the drive source and thus limiting the length of the pull rope is solved. Due to the helical cooperation between the rope winding drum and the inner drum, the rope winding drum moves axially while the pull rope is being wound and released, so that the pull rope can be evenly wound on the rope winding drum and avoids stacking.

[0017] (2) The resistance transmission device provided in at least one embodiment of this application can increase training resistance and improve training intensity and obtain better training effect by designing a speed reducer without changing the motor power.

[0018] (3) The resistance transmission device provided in at least one embodiment of this application achieves the fixation of the inner cylinder by means of the reducer housing. By forming an assembly part at one end of the inner cylinder, the outer peripheral surface of the inner cylinder will not be affected while the inner cylinder is fixedly installed, thereby improving the reliability of the screw drive.

[0019] (4) The fitness equipment provided in at least one embodiment of this application can provide greater resistance through the resistance transmission device to meet the needs of high-intensity training. The length of the pull rope in the resistance transmission device can be freely designed to meet the requirements of different types and structures of fitness equipment, and there will be virtually no problems such as pull rope stacking or knotting, thus improving the user experience. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a resistance transmission device provided in one embodiment of this application;

[0022] Figure 2 This is a front view of a resistance transmission device according to an embodiment of this application in a rope-wound state;

[0023] Figure 3 This is a cross-sectional view of a resistance transmission device according to an embodiment of this application in the state of rope winding;

[0024] Figure 4 This is an exploded view (excluding the mounting bracket) of a resistance transmission device according to an embodiment of this application;

[0025] Figure 5 This is a front view of a resistance transmission device according to an embodiment of this application in the state where the pull rope is unwound;

[0026] Figure 6 This is a cross-sectional view of a resistance transmission device according to an embodiment of this application in the state where the pull rope is unwound;

[0027] Figure 7 This is a front view of the resistance transmission device according to another embodiment of this application in the state of rope winding;

[0028] Figure 8 This is a cross-sectional view of a resistance transmission device according to another embodiment of this application in the state of rope winding;

[0029] Figure 9 This is a front view of the resistance transmission device according to another embodiment of this application in the state where the pull rope is unwound;

[0030] Figure 10 This is a cross-sectional view of a resistance transmission device according to another embodiment of this application in the state where the pull rope is unwound;

[0031] Figure 11 An exploded view (excluding the mounting bracket) of a resistance transmission device according to another embodiment of this application;

[0032] Figure 12 This is a schematic diagram of the structure of a speed reducer according to one embodiment of this application;

[0033] Figure 13 This is a schematic diagram of the gear meshing of a reducer according to an embodiment of this application;

[0034] Figure 14 This is a schematic diagram of the structure of the reducer output terminal according to an embodiment of this application;

[0035] Figure 15 This is a schematic diagram of the structure of a rope winding tube according to one embodiment of this application. Figure 1 ;

[0036] Figure 16 This is a schematic diagram of the structure of a rope winding tube according to one embodiment of this application. Figure 2 ;

[0037] Figure 17 This is a schematic diagram of the structure of a rope winding cylinder according to another embodiment of this application.

[0038] In the picture:

[0039] 1. Drive source; 11. Output shaft of drive source; 2. Reducer; 21. Reducer housing; 22. Reducer output shaft; 23. Inner chamber; 24. Internal gear ring; 25. Central gear; 26. Planetary gear; 27. Output flange; 28. Planetary shaft; 3. Rotating shaft; 31. External spline; 4. Inner cylinder; 41. External thread; 42. Assembly part; 5. Rope winding drum; 51. Internal thread; 52. Mating end face; 53. Assembly 54. Internal spline; 55. Rope threading hole; 56. Groove; 57. Partition; 58. Annular groove; 6. Pull rope; 7. Mounting bracket; 71. First side plate; 72. Second side plate; 721. Second mounting hole; 73. Connecting plate; 731. Outlet; 74. Mounting seat; 75. Bearing seat; 8. Limiting element; 81. Limiting rod; 82. Limiting part; 9. Fixing seat; 91. First mounting hole; 92. Receiving part. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0042] In the description of this application, it should be understood that the terms "center," "inner," "outer," "axial," "radial," "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. 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 indicated technical features. The term "multiple" in this application includes two or more cases.

[0043] In this application, unless otherwise expressly 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 part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] This application provides a resistance transmission device that can be used in various fitness equipment that uses ropes for strength training.

[0045] like Figures 1-4 As shown, the resistance transmission device includes a drive source 1, a reducer 2, a rotating shaft 3, an inner cylinder 4, and a rope winding cylinder 5.

[0046] Torque is provided by rotating the output shaft 11 of drive source 1. The torque provided by drive source 1 serves as resistance for the user to perform strength training. Drive source 1 can be selected from various existing power components capable of providing torque, such as servo motors.

[0047] Reducer 2 is used to change the speed and torque output by the output shaft 11 of drive source 1. The transmission ratio of reducer 2 is the ratio of input speed to output speed. When the transmission ratio is greater than 1, the output speed is made less than the input speed through the action of reducer 2. According to the law of conservation of energy, under ideal conditions where mechanical losses are ignored, input torque × input speed = output torque × output speed. Therefore, with the output speed decreasing, the output torque increases, which increases the training resistance without changing the motor power, thereby improving the training intensity and achieving a better training effect. The transmission ratio of the reducer can be selected according to the required training resistance.

[0048] For example, if the torque output by the output shaft 11 of the drive source 1 is 10 N·m and the transmission ratio of the reducer 2 is 4, then the output speed of the reducer 2 is 1 / 4 of the input speed, and the output torque of the reducer 2 is 4 times the output torque of the drive source 1, increasing the torque to 40 N·m.

[0049] The reducer 2 includes a reducer housing 21 and an input end and an output end located at both ends of the reducer housing 21. The input end of the reducer 2 is connected to the output shaft 11 of the drive source 1, thereby transmitting the torque provided by the drive source 1 to the reducer 2. Through the reduction action of the reducer 2, the output torque can be increased.

[0050] The inner cylinder 4 is fixedly connected to the reducer housing 21. Since the reducer housing 21 is fixed, the inner cylinder 4 is fixedly installed using the reducer housing 21 in this application.

[0051] The rotating shaft 3 is synchronously connected to the output end of the reducer 2, and transmits the speed and torque changed by the reducer 2 to the rotating shaft 3.

[0052] See Figures 2-6 The rope winding drum 5 rotates synchronously with the rotating shaft 3, and the rope winding drum 5 can slide along the axial direction of the rotating shaft 3. The rope winding drum 5 is sleeved on the outside of the inner cylinder 4, and the inner surface of the rope winding drum 5 is screwed with the outer surface of the inner cylinder 4 to convert the rotation of the rope winding drum 5 into sliding along the axial direction of the rotating shaft 3. The outer circumference of the rope winding drum 5 is used to wind the pull rope 6.

[0053] During use, the output shaft 11 of the drive source 1 rotates by default in the first direction, and transmits torque to the rotating shaft 3 through the output end of the reducer 2, and then to the winding drum 5. The first direction is the same as the winding direction of the pull rope 6. Therefore, the pull rope 6 tends to be wound on the winding drum 5. The first direction is either clockwise or counterclockwise.

[0054] By pulling the rope 6, the torque transmitted from the drive source 1 through the reducer 2 and the rotating shaft 3 to the winding drum 5 is overcome, causing the winding drum 5 to rotate in the second direction. This, in turn, drives the rotating shaft 3 and the output shaft 11 of the drive source 1 to rotate in the second direction, which is opposite to the first direction. The rope 6 is wound from left to right out of the winding drum 5. Figure 5 and Figure 6 As shown, due to the helical transmission between the rope winding drum 5 and the inner drum 4, the rope winding drum 5 rotates while moving to the left along the axial direction and gradually separating from the inner drum 4. During the axial movement, the rope 6 is wound out one turn after another.

[0055] When the external force on the pull rope 6 is removed, the output shaft 11 of the drive source 1 resumes rotation along the first direction, thereby driving the rotating shaft 3 and the rope winding drum 5 to rotate again along the first direction. At the same time, the rope winding drum 5 moves axially to the right and is sleeved on the outside of the inner drum 4. The pull rope 6 is evenly wound around the rope winding drum 5 from right to left, realizing the storage of the pull rope 6 and restoring its original state. Figure 2 and Figure 3 The state shown.

[0056] It is understood that during the winding and unwinding process of the pull rope 6, the axial movement direction of the rope drum 5 is always opposite to the winding and unwinding direction of the pull rope 6 (i.e., the winding direction or the release direction). This effect can be achieved through the design of the thread direction, which is something that those skilled in the art can achieve based on common knowledge, and will not be elaborated upon in this application.

[0057] In this way, the winding drum 5 provides a base for the rope 6 to be wound. Since the diameter of the winding drum 5 can be designed according to the required length of the rope 6, the problem of the rope 6 being limited in length due to direct winding around the output shaft 11 of the drive source 1 is solved. Under the helical cooperation of the winding drum 5 and the inner drum 4, the winding drum 5 moves axially while the rope 6 is being wound and unwound, allowing the rope 6 to be evenly wound on the winding drum 5, avoiding stacking. Furthermore, due to the design of the reducer 2, the training resistance can be increased without changing the motor power, thereby improving training intensity and achieving better training results.

[0058] In some embodiments, the spiral drive between the rope winding drum 5 and the inner cylinder 4 is such that the pitch of the spiral drive between the rope winding drum 5 and the inner cylinder 4 is equal to the diameter of the pull rope 6, so that when the pull rope 6 is wound around once, the rope winding drum 5 rotates once relative to the inner cylinder 4, so that the outlet position of the pull rope 6 remains unchanged in the axial direction.

[0059] In some embodiments, such as Figures 2-6 As shown, the outer surface of the inner cylinder 4 has an external thread 41, and the inner surface of the rope winding drum 5 has an internal thread 51. The inner surface of the rope winding drum 5 and the outer surface of the inner cylinder 4 are threaded together. In this embodiment, the helical drive between the rope winding drum 5 and the inner cylinder 4 is achieved by threaded engagement, which is convenient to process and has a simple structure.

[0060] This application provides two different implementation schemes for the installation position of the inner cylinder 4.

[0061] In the first implementation, such as Figures 1-6 As shown, the inner cylinder 4 is fitted outside the reducer housing 21 and is fixedly connected to it. With the inner cylinder 4 fitted inside the reducer housing 21, the rope winding drum 5 is located outside the reducer housing 21 when the rope 6 is not subjected to external force. During rope release, it moves axially away from the reducer 2 along the axis of rotation 3. Since the rope winding drum 5 is initially located axially at the reducer 2, the overall axial length of the resistance transmission device can be reduced, which is beneficial for miniaturizing the fitness equipment.

[0062] In some embodiments of the first implementation, such as Figure 3 and Figure 4 As shown, to achieve the installation of the inner cylinder 4 and the reducer housing 21, one end of the inner cylinder 4 extends radially inward to form an assembly part 42. The inner surface of the assembly part 42 abuts against and is fixedly connected to the outer surface of the end of the reducer housing 21. By forming the assembly part 42 at one end of the inner cylinder 4, the outer circumferential surface of the inner cylinder 4 will not be affected while the inner cylinder 4 is fixedly installed, thus improving the reliability of the screw drive.

[0063] In the second implementation, such as Figures 7-11As shown, the inner cylinder 4 is sleeved outside the rotating shaft 3 and spaced apart from the rotating shaft 3. The end of the inner cylinder 4 near the reducer 2 is fixedly connected to the reducer housing 21. Although the inner cylinder 4 is sleeved outside the rotating shaft 3, it is spaced apart from the rotating shaft 3. That is, the inner cylinder 4 has no connection or cooperation with the rotating shaft 3. The inner cylinder 4 is fixedly installed by means of the reducer housing 21.

[0064] In the second embodiment, the initial position of the rope winding drum 5 is located at the rotation axis 3 in the axial direction. During the rope release process, it moves in the axial direction away from the reducer 2. Compared with the above embodiment, the overall axial length of the resistance transmission device is increased. However, since the size of the inner drum 4 does not need to be constrained by the reducer housing 21, the size design of the inner drum 4 is more diversified to meet different design requirements.

[0065] In some embodiments of the second implementation, such as Figure 8 As shown, the inner cylinder 4 extends radially inward from the end near the reducer 2 to form an assembly part 42. The outer surface of the assembly part 42 is opposite to and fixedly connected to the outer surface of the end of the reducer housing 21.

[0066] In some embodiments, the output end of the reducer 2 is provided with a reducer output shaft 22, which is synchronously rotatably connected to the rotating shaft 3, such as... Figure 3 As shown, the output shaft 11 of the drive source 1, the output shaft 22 of the reducer, and the rotating shaft 3 are coaxially arranged. This arrangement ensures that torque is always output through the same axis, avoiding eccentricity during rotation and improving the lifespan of the device and the reliability of torque output.

[0067] In some embodiments, the reducer 2 may be a planetary gear reducer. Specifically, such as Figure 13 As shown, the reducer housing 21 defines an inner chamber 23, and the inner wall surface of the inner chamber 23 is provided with internal teeth to form an internal gear ring 24; a central gear 25 and a plurality of planetary gears 26 are provided in the inner chamber 23, the central gear 25 is synchronously connected to the output shaft 11 of the drive source 1, and each planetary gear 26 meshes with the central gear 25 and the internal gear ring 24 at the same time.

[0068] The planetary gear reducer receives power from the drive source 1 through the central gear 25 (also known as the sun gear), which rotates actively and drives the planetary gears 26. There are typically 3 to 6 planetary gears 26, evenly distributed around the central gear 25, meshing with both the central gear 25 and the internal gear ring 24. Each planetary gear 26 rotates on its own axis and revolves around the central gear 25. The planetary gear reducer has a compact structure, a wide transmission ratio range, and strong load-bearing capacity, meeting the high torque and small size requirements of fitness equipment.

[0069] like Figures 12-14As shown, the reducer 2 also includes an output flange 27. The output shaft 22 of the reducer is fixedly connected to the outside of the output flange 27. The inside of the output flange 27 is provided with multiple planetary shafts 28 corresponding to multiple planetary gears 26. Each planetary shaft 28 is rotatably connected to the center of the corresponding planetary gear 26.

[0070] The central gear 25 is synchronously connected to the output shaft 11 of the drive source 1, inputting the torque of the drive source 1 into the reduction gearbox. The planetary gear rotates around the central gear 25 under the drive of the central gear 25, and drives the output flange 27 to rotate through the revolution of the planetary shaft 28, thereby outputting the torque adjusted by the reducer 2 through the reducer output shaft 22.

[0071] In some embodiments, the reducer output shaft 22 is connected to the rotating shaft 3 via a flat key, thereby transmitting the torque of the reducer output shaft 22 to the rotating shaft 3.

[0072] In some embodiments, such as Figure 4 As shown, an axially extending external spline 31 is formed on the outer surface of the rotating shaft 3; the end of the winding drum 5 away from the drive source 1 extends radially inward to form a mating end face 52, and the mating end face 52 has an assembly hole 53 for the rotating shaft 3 to pass through. An internal spline 54 is provided axially at the assembly hole 53, and the internal spline 54 is adapted to the external spline 31 so that the winding drum 5 rotates synchronously with the rotating shaft 3.

[0073] The rotating shaft 3 passes through the mounting hole 53 of the rope drum 5, and engages with the external spline 31 on the rotating shaft 3 via the internal spline 54 at the mounting hole 53, thereby transmitting the torque of the rotating shaft 3 to the rope drum 5. The external spline 31 extends axially along the rotating shaft 3, ensuring that the rope drum 5 can form a stable spline engagement with the rotating shaft 3 along the entire axial direction during its sliding motion, thus improving the reliability of torque transmission.

[0074] In some embodiments, such as Figures 1-10 As shown, the resistance transmission device also includes a mounting frame 7; the mounting frame 7 includes a first side plate 71 and a second side plate 72 disposed opposite to each other, and a connecting plate 73 connecting the first side plate 71 and the second side plate 72. The drive source 1 is mounted on the first side plate 71; the end of the rotating shaft 3 away from the reducer 2 is rotatably mounted on the second side plate 72.

[0075] The first side plate 71 and the second side plate 72 are located at the two ends of the torque transmission axis, respectively, providing a mounting base for each component of the resistance transmission device. The connecting plate 73 connects the first side plate 71 and the second side plate 72, so that the mounting frame 7 forms a stable whole and provides good support for each component.

[0076] Optionally, a bearing seat 75 is mounted on the second side plate 72, and the end of the rotating shaft 3 is mounted on the second side plate 72 via the bearing seat 75.

[0077] In some embodiments, such as Figure 1 As shown, a guide section 731 for the pull rope 6 is provided on the connecting plate 73. The end of the pull rope 6 passes through the guide section 731, passes through the connecting plate 73, and is connected to a force-applying component such as a handle, so that the user can apply external force.

[0078] In some embodiments, such as Figure 1 As shown, the pull rope 6 extends outward through the guide portion 731 along the tangential direction of the rope drum 5. Optionally, the guide portion 731 is configured such that its edge does not contact the pull rope 6 passing through it, thereby avoiding wear caused by the pull rope contacting the edge of the guide portion 731 during the pulling and unwinding process, and extending the service life of the pull rope.

[0079] Optionally, the connecting plate 73 has two outlets 731, which are located on both sides of the winding drum 5 in the radial direction, so that the pull rope 6 can be led out from the outlets 731 on the corresponding sides when it is wound in two opposite directions.

[0080] In some embodiments, the outlet portion 731 may be a hole formed in the connecting plate 73; in other embodiments, the outlet portion 731 may also be a notch formed on the edge of the connecting plate 73, such as... Figure 1 As shown.

[0081] In some embodiments, the first side plate 71 and the second side plate 72 are folded outward on the opposite side of the connecting plate 73 to form a mounting base 74. The mounting base 74 is fixedly assembled with the mounting surface on the fitness equipment by fasteners such as bolts, providing a stable mounting structure for the resistance transmission device and preventing the resistance transmission device from shifting under external force or vibration.

[0082] In some embodiments, such as Figures 1-11 As shown, the resistance transmission device also includes multiple limiting members 8; the multiple limiting members 8 extend along the axial direction of the winding drum 5 and are distributed around the circumference of the winding drum 5, and a winding space is formed between the multiple limiting members 8 and the winding drum 5, the winding space being configured to allow only a single layer of pull rope 6 to be wound on the winding drum 5.

[0083] By setting limiting members 8 around the circumference of the winding drum 5, the winding position of the pull rope 6 is restricted, further preventing the pull rope 6 from stacking or shifting during the winding process, and ensuring that the pull rope 6 is wound in a single layer on the winding drum 5. The number of limiting members 8 can be selected according to actual needs. Theoretically, the more limiting members 8 there are, the better the limiting effect on the pull rope 6, but the higher the cost.

[0084] In some embodiments, the resistance transmission device further includes a fixing seat 9, which is located on the side of the winding drum 5 away from the second side plate 72. The fixing seat 9 has a plurality of first mounting holes 91 corresponding to a plurality of limiting members 8, and the second side plate 72 has a plurality of second mounting holes 721 corresponding to a plurality of limiting members 8. Each limiting member 8 includes a limiting rod 81 and limiting portions 82 located at both ends of the limiting rod 81. The size of the first mounting holes 91 and the second mounting holes 721 is larger than the size of the limiting rod 81 and smaller than the size of the limiting portions 82.

[0085] The limiting rod 81 is located between the fixed base 9 and the second side plate 72. The two ends of the limiting rod 81 pass through the first mounting hole 91 and the second mounting hole 721 respectively, and the limiting parts 82 at both ends of the limiting rod 81 are located on opposite sides of the fixed base 9 and the second side plate 72, so that the limiting rod 81 can be rotatably installed between the fixed base 9 and the second side plate 72.

[0086] In the above embodiments, an installation method for the limiting member 8 is provided. Both ends of the limiting member 8 are supported by the second side plate 72 and the fixing seat 9, respectively, to achieve positioning and installation of the limiting member 8. The limiting parts 82 at both ends of the limiting rod 81 limit the limiting rod 81 between the second side plate 72 and the fixing seat 9, preventing the limiting rod 81 from coming out of the first mounting hole 91 or the second mounting hole 721. Furthermore, this installation method does not restrict the rotation of the limiting member 8. During the rotation of the rope drum 5, the limiting member 8 rubs against the pull rope 6 on the rope drum 5. Under the action of friction, the limiting member 8 will rotate, resulting in rolling friction between the limiting member 8 and the pull rope 6. This not only provides a limiting function but also reduces friction, avoiding obstruction to the rotation of the rope drum 5.

[0087] To ensure the rotation of the limiting component 8, the dimensions of the first mounting hole 91 and the second mounting hole 721 are larger than the dimensions of the limiting rod 81, with a margin of safety. For example, if the diameter of the limiting rod 81 is 5mm, the diameter of the first mounting hole 91 and the second mounting hole 721 is designed to be 5.5mm.

[0088] In some embodiments, the mounting base 9 is fixedly connected to the connecting plate 73 to achieve the installation and fixation of the mounting base 9.

[0089] Understandably, in order to improve the stability of the installation, the thickness of the fixing base 9 can be appropriately increased, thereby increasing the contact area between the fixing base 9 and the connecting plate 73. The two can be fixedly connected by fasteners, such as bolts.

[0090] In some embodiments, such as Figure 4 and Figure 11As shown, the mounting base 9 has an inwardly recessed receiving portion 92 on the side facing the reducer 2, which is used to receive at least a portion of the structure of the reducer 2. In this embodiment, even if the thickness of the mounting base 9 is increased, the overall axial dimension will not increase significantly, which is beneficial to reducing the size of the equipment.

[0091] In some embodiments, such as Figure 2 and Figure 3 As shown, the fixing seat 9 is located at the end of the reducer housing 21 near the drive source 1 and is fixedly connected to the end face of the reducer housing 21. The distance between the fixing seat 9 and the second side plate 72 can cover the entire axial length of the winding drum 5, so that the pull rope 6 on the winding drum 5 can always be limited by the limiting member 8.

[0092] In other embodiments, such as Figure 7 and Figure 8 As shown, when the inner cylinder 4 is installed using the second embodiment described above, that is, when the outer surface of the assembly part 42 of the inner cylinder 4 is opposite to and fixedly connected to the outer surface of the end of the reducer housing 21, the fixing seat 9 is provided between the assembly part 42 of the inner cylinder 4 and the end of the reducer housing 21.

[0093] Optionally, a through hole is provided in the middle region of the fixed base 9 to allow the output shaft 11 of the drive source 1 (e.g., Figure 3 (as shown) or reducer output shaft 22 (as shown) Figure 8 (As shown) pass through to avoid obstructing axial transmission.

[0094] In some embodiments, such as Figures 15-17 As shown, multiple rope holes 55 are provided on the outer periphery of the end face of the rope winding cylinder 5, and the multiple rope holes 55 are evenly distributed along the circumference of the end face; the end of the pull rope 6 passes through the multiple rope holes 55 in sequence and is knotted at the end, thereby fixing the end of the pull rope 6 to the rope winding cylinder 5.

[0095] One end of the pull rope 6 is fixed to the rope drum 5 through the rope hole 55. The pull rope 6 is wound around the rope drum 5, and the other end of the pull rope 6 is led outward as the user's force application end. By opening multiple rope holes 55 circumferentially on the end face of the rope drum 5, the pull rope 6 is wound around each rope hole 55 in sequence, so that the force exerted on the rope drum 5 by the end of the pull rope 6 is evenly distributed, preventing stress concentration at the fixed position due to single-point force, which could lead to damage to the fixed position.

[0096] The rope winding cylinder 5 may have a rope hole 55 formed on only one end face, or it may have rope holes 55 formed on both end faces.

[0097] In some embodiments, the winding drum 5 includes a rope winding surface, around which the rope 6 is wound. Multiple rope-threading holes 55 are arranged radially inward relative to the rope winding surface of the winding drum 5. Because the rope-threading holes 55 are positioned inward relative to the rope winding surface, after the rope 6 is fixed at the end of the winding drum 5, it is guided radially outward to the rope winding surface for winding. This can, to some extent, obscure the fixed position of the rope 6 and prevent any impact on the starting point of the rope winding.

[0098] The rope winding surface of the rope winding cylinder 5 is recessed inward to form multiple grooves 56, and each rope hole 55 is correspondingly provided with one groove 56. The grooves 56 formed on the rope winding surface corresponding to the rope hole 55 make it easy for the rope 6 to pass through the rope hole 55, and can hide the knotted part of the rope 6 in the grooves 56 below the winding surface, improving the aesthetics.

[0099] In some embodiments, such as Figure 17 As shown, the groove 56 is located near the rope hole 55. The groove 56 is only formed near the rope hole 55 and is located on the same radial direction as the rope hole 55, which facilitates the passage of the rope 6.

[0100] In other embodiments, such as Figure 15 and Figure 16 As shown, multiple partitions 57 are provided along the outer periphery of the rope winding cylinder 5, and grooves 56 are formed between adjacent partitions 57. The outer edges of the partitions 57 are located on the same circumference to form a rope winding surface.

[0101] In some embodiments, an annular groove 58 is formed on the end face of the rope winding cylinder 5, and a plurality of rope holes 55 are located at the bottom of the annular groove 58. This annular groove 58 design can hide the part of the pull rope 6 that is wound around the rope holes 55, and provides good protection for the fixing part of the pull rope 6, preventing problems such as wear of the pull rope 6 due to contact with the outside world.

[0102] The outer diameter of the two end faces of the rope winding cylinder 5 is larger than the outer diameter of the rope winding surface, so that the rope 6 can be limited from both ends to prevent the rope 6 from falling off from both sides.

[0103] This application also provides a fitness equipment that includes a resistance transmission device as described in any of the above embodiments. The resistance transmission device can provide greater resistance to the fitness equipment, meeting the needs of higher-intensity training. Furthermore, the length of the pull rope 6 in this resistance transmission device can be freely designed to meet the requirements of different types and structures of fitness equipment, and it virtually eliminates problems such as the pull rope 6 stacking or knotting, thus improving the user experience.

[0104] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0105] The above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A resistance transmission device, characterized by, include: A drive source, which rotates through its output shaft to provide torque; A speed reducer, the speed reducer including a speed reducer housing and an input end and an output end located at both ends of the speed reducer housing, the input end being connected to the output shaft of the drive source; A rotating shaft is synchronously connected to the output end of the reducer; The inner cylinder is fitted onto the outside of the reducer housing and is fixedly connected to the reducer housing; A rope winding cylinder is provided, the outer circumference of which is used to wind a pull rope. The rope winding cylinder rotates synchronously with the rotating shaft and can slide along the axial direction of the rotating shaft. The rope winding cylinder is sleeved on the outside of the inner cylinder, and the inner surface of the rope winding cylinder is helically driven with the outer surface of the inner cylinder to convert the rotation of the rope winding cylinder into sliding along the axial direction of the rotating shaft.

2. The resistance transmitting device of claim 1, wherein One end of the inner cylinder extends radially inward to form an assembly part, and the inner surface of the assembly part abuts against and is fixedly connected to the outer surface of the end of the reducer housing.

3. The resistance transmission device according to claim 1, characterized in that, The output end of the reducer is provided with a reducer output shaft, which is synchronously connected to the rotating shaft. The output shaft of the drive source, the reducer output shaft, and the rotating shaft are coaxially arranged.

4. The resistance transmission device according to claim 3, characterized in that, The reducer housing defines an inner chamber, and the inner wall surface of the inner chamber is provided with internal teeth to form an internal gear ring; The inner chamber contains a central gear and multiple planetary gears. The central gear is synchronously connected to the output shaft of the drive source, and each planetary gear meshes with both the central gear and the internal gear ring. The reducer also includes an output flange, the outer side of which is fixedly connected to the output shaft of the reducer, and the inner side of the output flange is provided with multiple planetary shafts corresponding to the multiple planetary gears, with each planetary shaft being rotatably connected to the center of the corresponding planetary gear.

5. The resistance transmission device according to claim 1, characterized in that, An axially extending external spline is formed on the outer surface of the rotating shaft; The end of the rope winding drum away from the drive source extends radially inward to form a mating end face. The mating end face has an assembly hole for the rotating shaft to pass through. An internal spline is provided axially at the assembly hole. The internal spline is adapted to the external spline so that the rope winding drum rotates synchronously with the rotating shaft.

6. The resistance transmission device according to claim 1, characterized in that, It also includes a mounting bracket, which includes a first side plate and a second side plate disposed opposite to each other, and a connecting plate connecting the first side plate and the second side plate; The drive source is mounted on the first side plate; The end of the rotating shaft away from the reducer is rotatably mounted on the second side plate.

7. The resistance transmission device according to claim 6, characterized in that, It also includes multiple limiting components and a fixing base; The plurality of limiting members extend along the axial direction of the rope winding drum and are distributed around the circumference of the rope winding drum. A winding space is formed between the plurality of limiting members and the rope winding drum. The winding space is configured to allow only a single layer of the pull rope to be wound on the rope winding drum. Each of the limiting members includes a limiting rod and limiting portions located at both ends of the limiting rod; The fixing seat is located on the side of the rope winding cylinder away from the second side plate, and multiple first mounting holes are provided on the fixing seat corresponding to multiple limiting members; The second side plate has multiple second mounting holes corresponding to the multiple limiting members; The dimensions of the first mounting hole and the second mounting hole are larger than the dimensions of the limiting rod and smaller than the dimensions of the limiting part; The limiting rod is located between the fixed base and the second side plate. The two ends of the limiting rod pass through the first mounting hole and the second mounting hole respectively, and the limiting parts at both ends of the limiting rod are located on opposite sides of the fixed base and the second side plate, so as to rotatably install the limiting rod between the fixed base and the second side plate.

8. The resistance transmission device according to claim 1, characterized in that, The end face of the rope winding cylinder has multiple rope-threading holes near its outer periphery, and the multiple rope-threading holes are evenly distributed along the circumference of the end face. The end of the pull rope is passed through multiple rope holes in sequence and then knotted at the end to fix the end of the pull rope to the rope winding drum.

9. The resistance transmission device according to claim 6, characterized in that, The connecting plate has an outlet for the pull rope to be led outward through the outlet along the tangent direction of the rope winding drum.

10. A fitness equipment, characterized in that, Includes the resistance transmission device as described in any one of claims 1-9.

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