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 gearbox, a rotating shaft, a rope drum, a linkage, and a screw. The gearbox includes a driving gear and a driven gear. The driving gear is connected to the output shaft of the drive source, and the driven gear meshes with the driving gear. The driven gear has an internal threaded hole at its center. The rotating shaft is connected to the output shaft of the drive source. The rope drum is sleeved outside the rotating shaft and rotates synchronously with the rotating shaft. The rope drum can slide along the axial direction of the rotating shaft. The linkage is located opposite the gearbox on the side of the rope drum away from the gearbox. The linkage is configured to move synchronously with the rope drum along the axial direction of the rotating shaft. The screw is parallel to the rotating shaft. One end of the screw is connected to the linkage, and the other end of the screw is inserted into the internal threaded hole of the driven gear. Through the cooperation of the gearbox, screw, and linkage, the rope drum is driven to move axially, guiding the ropes to arrange in an orderly manner and preventing the ropes from stacking or knotting.

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 retraction and extension process. Due to the limited diameter and length of the motor's output shaft, the length of the pull rope is restricted, and it is very easy for the pull rope to become unevenly wound, knotted, or piled up. This not only affects the service life of the equipment but may also cause the pull rope to break due to excessive local stress, creating a safety hazard. Utility Model Content

[0004] To address at least one shortcoming in the related technologies, this application provides a resistance transmission device and fitness equipment. Through the cooperation of a gearbox, screw, and linkage, it drives the axial movement of the rope drum, guides the ropes to be arranged in an orderly manner, and basically avoids problems such as rope stacking and knotting, ensuring the continuity of training and improving the user experience.

[0005] This application provides a resistance transmission device, comprising: a drive source, a gearbox, a rotating shaft, a rope drum, a linkage, and a screw; the output shaft of the drive source rotates to provide torque; the gearbox includes a driving gear and a driven gear, the driving gear being drivenly connected to the output shaft of the drive source, the driven gear meshing with the driving gear, and the driven gear having an internal threaded hole at its center; the rotating shaft is located on the side of the gearbox away from the drive source, and is drivenly connected to the output shaft of the drive source; the outer circumference of the rope drum is used to wind a pull rope, the rope drum is sleeved outside the rotating shaft, the rope drum rotates synchronously with the rotating shaft, and the rope drum can slide along the axial direction of the rotating shaft; the linkage is located opposite the gearbox on the side of the rope drum away from the gearbox, and the linkage is configured to move synchronously with the rope drum along the axial direction of the rotating shaft; the screw is parallel to the rotating shaft, one end of the screw is connected to the linkage, and the other end of the screw is inserted into the internal threaded hole of the driven gear; the rotation of the driving gear drives the rotation of the driven gear, thereby driving the screw to rotate and move linearly along the axial direction, so that the linkage and the rope drum move linearly along the axial direction of the rotating shaft.

[0006] In some embodiments, there are multiple driven gears, which are distributed around the driving gear and mesh with it; there are multiple screws corresponding to the multiple driven gears, with one end of each screw connected to the linkage and the other end threadedly engaged with the corresponding driven gear.

[0007] In some embodiments, the linkage includes a first clamping plate and a second clamping plate disposed opposite to each other; the end face of the rope winding cylinder near the linkage extends radially outward to form a clamping portion, which is clamped between the first clamping plate and the second clamping plate.

[0008] 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 gearbox is rotatably mounted on the second side plate.

[0009] In some embodiments, the resistance transmission device further includes a plurality of limiting members and a fixing seat; the plurality of limiting members extend along the axial direction of the rope drum and are distributed around the circumference of the rope drum, and a winding space is formed between the plurality of limiting members and the rope drum, the winding space being configured to allow only a single layer of pull rope to be wound on the rope drum; the fixing seat is fixed to the connecting plate; one end of each limiting member is connected to the fixing seat, and the other end passes through the first clamping plate and the second clamping plate in sequence and is connected to the second side plate.

[0010] In some embodiments, each limiting member includes a limiting rod and limiting portions located at both ends of the limiting rod; a plurality of first mounting holes are provided on the fixing base corresponding to the plurality of limiting members, and 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 two ends of the limiting rod pass 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 base and the second side plate, so that the limiting rod can be rotatably mounted between the fixing base and the second side plate.

[0011] In some embodiments, a reducer is further provided between the drive source and the gearbox. The input end of the reducer is connected to the output shaft of the drive source, and the output end of the reducer is connected to the drive gear and the rotating shaft of the gearbox to change the magnitude of the torque output by the drive source.

[0012] 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.

[0013] 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.

[0014] This application also provides a fitness device including a 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 drives the rope drum to move axially along the rotation axis through the cooperation of the gearbox, screw and linkage. While the rope drum rotates to retract and release the rope, it also moves linearly along the axial direction to orderly wind the rope onto the rope drum or orderly wind it out from the rope drum, effectively preventing the rope from knotting or tangling, stacking and other phenomena, ensuring the continuity of the training process and improving the user experience.

[0017] (2) The fitness equipment provided in at least one embodiment of this application is equipped with a resistance transmission device. Through the cooperation of a gearbox, a screw and a linkage, it drives the axial movement of the rope drum, guides the rope to wind or release in an orderly manner, and basically avoids problems such as rope stacking and knotting, ensuring the continuity of training and improving the user experience. Attached Figure Description

[0018] 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:

[0019] Figure 1 This is a schematic diagram of the resistance transmission device provided in the embodiments of this application;

[0020] Figure 2 This is a front view of the resistance transmission device according to an embodiment of this application in the state of rope winding;

[0021] Figure 3 This is a cross-sectional view of the resistance transmission device according to an embodiment of this application in the state of rope winding;

[0022] Figure 4 This is a front view of the resistance transmission device according to an embodiment of this application in the state where the pull rope is unwound;

[0023] Figure 5 This is a cross-sectional view of the resistance transmission device according to an embodiment of this application in the state where the pull rope is unwound;

[0024] Figure 6 for Figure 5 A magnified view of part A in the middle;

[0025] Figure 7 This is an exploded view (excluding the mounting bracket) of the resistance transmission device according to an embodiment of this application;

[0026] Figure 8This is a schematic diagram showing the cooperation relationship between the gearbox, screw, linkage and rope winding drum in the embodiments of this application;

[0027] Figure 9 This is a schematic diagram illustrating the meshing relationship between the driving gear and the driven gear in an embodiment of this application.

[0028] Figure 10 This is a schematic diagram of the rope winding cylinder in an embodiment of this application;

[0029] Figure 11 This is a front view of the rope-winding cylinder in an embodiment of this application;

[0030] Figure 12 This is a schematic diagram of the reducer in an embodiment of this application;

[0031] Figure 13 This is a schematic diagram of the gear engagement of the reducer in an embodiment of this application;

[0032] Figure 14 This is a schematic diagram of the output end of the reducer in an embodiment of this application.

[0033] In the picture:

[0034] 1. Drive source; 11. Output shaft of drive source; 2. Rotary shaft; 21. External spline; 3. Rope winding drum; 31. Pull rope; 32. Clamping part; 33. Mating end face; 34. Assembly hole; 35. Internal spline; 36. Rope threading hole; 37. Groove; 4. Gearbox; 41. Driving gear; 42. Driven gear; 421. Internal threaded hole; 5. Linkage component; 51. First clamping plate; 52. Second clamping plate; 6. Screw; 7. Mounting bracket; 71. First side plate; 72. Second side plate 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; 10, Reducer; 101, Reducer output shaft; 102, Reducer housing; 103, Inner chamber; 104, Internal gear ring; 105, Central gear; 106, Planetary gear; 107, Output flange; 108, Planetary shaft. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] In the description of this application, it should be understood that the terms "center," "left," "right," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are 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.

[0038] 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.

[0039] This application provides a resistance transmission device that can be used in various fitness equipment that uses ropes for strength training.

[0040] like Figures 1-7 As shown, the resistance transmission device includes a drive source 1, a rotating shaft 2, and a rope winding drum 3.

[0041] 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.

[0042] The rotating shaft 2 is connected to the output shaft 11 of the drive source 1. The rotation of the output shaft 11 of the drive source 1 drives the rotating shaft 2 to rotate, thereby transmitting torque to the rotating shaft 2.

[0043] The rope winding cylinder 3 is sleeved outside the rotating shaft 2 and rotates synchronously with the rotating shaft 2. The rope winding cylinder 3 can slide along the axial direction of the rotating shaft 2. The outer circumference of the rope winding cylinder 3 is used to wind the pull rope 31.

[0044] While winding and unwinding the pull rope 31, the winding drum 3 moves along the axial direction of the rotating shaft 2, which can orderly wind the pull rope 31 side by side on the winding drum 3 or wind the pull rope 31 out of the winding drum 3 one loop at a time, preventing the pull rope 31 from getting knotted or tangled and stacked.

[0045] To enable the rope drum 3 to move axially along the rotating shaft 2, the resistance transmission device also includes a gearbox 4, a linkage 5, and a screw 6.

[0046] like Figures 1-5 and Figures 7-9 As shown, gearbox 4 is located between drive source 1 and rotating shaft 2. Gearbox 4 includes a driving gear 41 and a driven gear 42. The driving gear 41 is connected to the output shaft 11 of drive source 1, and the driven gear 42 meshes with the driving gear 41. The driven gear 42 has an internal threaded hole 421 at its center. The output shaft 11 of drive source 1 drives the driving gear 41 to rotate, and the driving gear 41 meshes with the driven gear 42, causing the driven gear 42 to rotate simultaneously.

[0047] The rotating shaft 2 is located on the side of the gearbox 4 away from the drive source 1. The output shaft 11 of the drive source 1 can pass through the drive gear 41 and connect to the rotating shaft 2, so that the drive source 1 can drive the drive gear 41 and the rotating shaft 2 to rotate simultaneously.

[0048] The linkage 5 is located opposite the gearbox 4 on the side of the rope drum 3 away from the gearbox 4, and the linkage 5 is configured to move synchronously with the rope drum 3 along the axial direction of the rotation shaft 2.

[0049] The screw 6 is parallel to the rotating shaft 2. One end of the screw 6 is connected to the linkage 5, and the other end of the screw 6 is inserted into the internal threaded hole 421 of the driven gear 42. Optionally, one end of the screw 6 is axially fixed and circumferentially rotatably connected to the linkage 5.

[0050] During use, the output shaft 11 of the drive source 1 rotates by default in the first direction and transmits torque to the drive gear 41 and the rotating shaft 2, and then to the winding drum 3. The first direction is the same as the winding direction of the pull rope 31. Therefore, the pull rope 31 tends to be wound on the winding drum 3. The first direction is either clockwise or counterclockwise.

[0051] By pulling the rope 31, the torque transmitted from the drive source 1 to the rope drum 3 via the rotating shaft 2 is overcome, causing the rope drum 3 to rotate in the second direction, which in turn drives the rotating shaft 2, the output shaft 11 of the drive source 1, and the drive gear 41 to rotate in the second direction. The second direction is opposite to the first direction, and the rope 31 is wound out of the rope drum 3.

[0052] When the external force on the pull rope 31 is removed, the output shaft 11 of the drive source 1 resumes rotation in the first direction, thereby driving the rotating shaft 2 and the winding drum 3 to rotate again in the first direction, and the pull rope 31 is wound on the winding drum 3.

[0053] When the rope drum 3 rotates to retract and extend the rope 31, the driven gear 42 is driven to rotate through the driving gear 41. Since the screw 6 is threadedly engaged with the internal threaded hole 421 of the driven gear 42, the screw 6 moves linearly along the axial direction. The linear movement direction of the screw 6 is opposite to the retraction and extension direction of the rope 31. The linkage 5 drives the rope drum 3 to move synchronously along the axial direction of the rotating shaft 2.

[0054] During the winding and unwinding process of the pull rope 31, the rope drum 3 rotates while moving along the axial direction, guiding the pull rope 31 to be wound side by side in an orderly manner on the rope drum 3 or to wind the pull rope 31 out of the rope drum 3 one loop at a time, preventing the pull rope 31 from getting knotted or tangled and stacked.

[0055] The screw 6 can be made to move in the opposite direction to the rope 31 (i.e., winding or releasing direction) by means of the thread rotation design. This is something that can be achieved by those skilled in the art based on common knowledge, and will not be elaborated upon in this application.

[0056] In the above technical solution, the torque is transmitted to the screw 6 through the cooperation of the driving gear 41 and the driven gear 42 in the gearbox 4, realizing the linear motion of the screw 6. At the same time, through the synchronous cooperation of the linkage 5 and the axial movement of the rope drum 3, the rope drum 3 is driven to move axially along the rotation axis 2. Thus, while the rope drum 3 rotates to wind and unwind the rope 31, it also moves linearly along the axial direction, winding the rope 31 around the rope drum 3 in circles, or winding the rope 31 out in circles. This effectively prevents the rope 31 from knotting, tangling, or stacking, ensuring the continuity of the training process and improving the user experience.

[0057] exist Figures 2-5 In the illustrated embodiment, during the pulling of the rope 31, as the winding drum 3 rotates, the screw 6 drives the winding drum 3 to move to the left, causing the rope 31 to wind out from left to right in turns; the resistance transmission device consists of... Figure 2 and Figure 3 The state change is Figure 4 and Figure 5 The state of the rope 31 during winding: As the winding drum 3 rotates, the screw 6 drives the winding drum to move to the right, causing the rope 31 to wind around the winding drum 3 sequentially from right to left, achieving single-layer winding and effectively avoiding stacking or knotting problems. The resistance transmission device consists of... Figure 4 and Figure 5 The state returns to Figure 2 and Figure 3 The state.

[0058] Understandably, during the retraction and extension of the aforementioned rope 31, the screw 6 will move linearly along the axial direction. It is necessary to ensure that no other components interfere with the movement of the screw 6. For example, to avoid interference from the drive source 1 to the screw 6, it is necessary to ensure that the screw 6 is located outside the drive source 1 on the projection plane perpendicular to the screw 6. The position of the screw 6 can be changed by adjusting the diameter of the driving gear 41 and / or the driven gear 42 in the gearbox 4.

[0059] In some embodiments, there are multiple driven gears 42, which are distributed around the driving gear 41 and mesh with it; there are multiple screws 6 corresponding to the multiple driven gears 42, with one end of each screw 6 connected to the linkage 5 and the other end threadedly engaged with the corresponding driven gear 42.

[0060] Through the cooperation of multiple driven gears 42 and multiple screws 6, multiple drive connection positions can be provided for the linkage 5 and the winding drum, ensuring the smoothness and reliability of the axial movement of the linkage 5 and the winding drum. Figures 7-9 In the embodiment shown, two screws 6 and two driven gears 42 are respectively provided, symmetrically located on both sides of the driving gear 41, driving the linkage 5 and the winding drum axial movement from both sides.

[0061] The driving gear 41 and driven gear 42 may have the same or different diameters. When the diameters of the driving gear 41 and driven gear 42 are the same, the gearbox 4 transmits power at the same speed and has no torque adjustment function. When the diameter of the driving gear 41 is larger than the diameter of the driven gear 42, the rotational speed of the driven gear 42 increases, and the torque output by the driven gear 42 decreases. When the diameter of the driving gear 41 is smaller than the diameter of the driven gear 42, the rotational speed of the driven gear 42 decreases, and the torque output by the driven gear 42 increases. In practical applications, gearboxes 4 with different transmission ratios can be selected as needed.

[0062] In some embodiments, the pitch of the screw 6 is equal to the diameter of the pull rope 31, such that for every turn of the pull rope 31, the screw 6 rotates one turn and drives the rope winding drum 3 to shift axially by a distance equal to the diameter of the pull rope 31, ensuring that the exit position of the pull rope 31 remains constant axially. This embodiment is effective when the diameters of the driving gear 41 and the driven gear 42 are the same. When the diameters of the driving gear 41 and the driven gear 42 are different, the pitch of the screw 6 needs to be designed in conjunction with the transmission ratio of the gearbox 4 and the diameter of the pull rope 31.

[0063] In some embodiments, such as Figure 5 and Figure 6As shown, the linkage 5 includes a first clamping plate 51 and a second clamping plate 52 arranged opposite to each other; the end face of the winding drum 3 near the linkage 5 extends radially outward to form a clamping part 32, which is clamped between the first clamping plate 51 and the second clamping plate 52.

[0064] The above embodiment provides one implementation of the linkage 5, which drives the axial movement of the rope drum 3 by clamping the first clamping plate 51 and the second clamping plate 52. The structure of the linkage 5 can simultaneously allow the circumferential rotation of the rope drum 3 without affecting the winding and unwinding of the pull rope 31.

[0065] In some embodiments, the middle regions of the first clamping plate 51 and the second clamping plate 52 are each provided with through holes, so that the first clamping plate 51 and the second clamping plate 52 are sleeved on the outside of the rotating shaft 2 and spaced apart from the rotating shaft 2 to avoid interference with the rotation of the rotating shaft 2; the first clamping plate 51 and the second clamping plate 52 can be connected by screws 6, and this structure in which the first clamping plate 51 and the second clamping plate 52 surround the rotating shaft 2 facilitates the design of multiple screws 6. Optionally, the first clamping plate 51 and the second clamping plate 52 can be annular.

[0066] In some embodiments, such as Figures 1-5 As shown, the resistance transmission device also includes a mounting frame 7, which 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; and the end of the rotating shaft 2 away from the gearbox 4 is rotatably mounted on the second side plate 72.

[0067] 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.

[0068] Optionally, a bearing seat 75 is mounted on the second side plate 72, and the end of the rotating shaft 2 is mounted on the second side plate 72 via the bearing seat 75.

[0069] In some embodiments, such as Figure 1 As shown, a guide section 731 is provided on the connecting plate 73 for the pull rope 31 to be guided out. The end of the pull rope 31 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.

[0070] In some embodiments, the pull rope 31 is led outward via the outlet 731 along the tangential direction of the rope drum 3.

[0071] Optionally, the guide section 731 is configured such that its edge does not contact the pull rope 31 passing through it, thereby avoiding wear caused by the pull rope contacting the edge of the guide section 731 during the pulling and extending the service life of the pull rope.

[0072] Optionally, such as Figure 1 As shown, 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 31 can be led out from the outlets 731 on the corresponding sides when it is wound in two opposite directions.

[0073] In some embodiments, the outlet portion 731 can be a hole formed in the connecting plate 73, such as... Figure 1 As shown; in other embodiments, the outlet portion 731 may also be a notch formed on the edge of the connecting plate 73.

[0074] In some embodiments, such as Figures 1-5 As shown, 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.

[0075] In some embodiments, such as Figures 1-5 and Figure 7 As shown, the resistance transmission device also includes multiple limiting members 8, which extend along the axial direction of the winding drum 3 and are distributed around the circumference of the winding drum 3. A winding space is formed between the multiple limiting members 8 and the winding drum 3. The winding space is configured to allow only a single layer of pull rope 31 to be wound on the winding drum 3.

[0076] By setting limiting members 8 around the 3rd circumference of the winding drum, the winding position of the pull rope 31 is restricted, further preventing the pull rope 31 from stacking or shifting during the winding process, ensuring that the pull rope 31 is wound in a single layer on the winding drum 3. 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 31, but the higher the cost.

[0077] In some embodiments, such as Figures 1-5 and Figure 7 As shown, the resistance transmission device also includes a fixed base 9, which is fixed to the connecting plate 73; one end of each limiting member 8 is connected to the fixed base 9, and the other end passes through the first clamping plate 51 and the second clamping plate 52 in sequence and is connected to the second side plate 72.

[0078] The installation of the limiting member 8 is achieved through the fixed seat 9 and the second side plate 72. At the same time, the sliding installation of the linkage member 5 is also achieved with the help of the limiting member 8. The first clamping plate 51 and the second clamping plate 52 of the linkage member 5 slide axially along the limiting member 8, which plays a guiding role in the movement of the linkage member 5.

[0079] Optionally, a through hole is provided in the middle area of ​​the fixed base 9 so that the shaft connected to the drive gear 41 can pass through, thereby avoiding obstruction to axial transmission.

[0080] 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.

[0081] In some embodiments, such as Figure 3 and Figure 7 As shown, the mounting base 9 has an inwardly recessed receiving portion 92 on the side facing the reducer 10, which is used to receive at least a portion of the structure of the reducer 10. 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.

[0082] In some embodiments, each limiting member 8 includes a limiting rod 81 and limiting portions 82 located at both ends of the limiting rod 81; a plurality of first mounting holes 91 are provided on the fixing base 9 corresponding to the plurality of limiting members 8, and a plurality of second mounting holes 721 are provided on the second side plate 72 corresponding to the plurality of limiting members 8; 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 portion 82.

[0083] 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.

[0084] In the above embodiment, an installation method for the limiting member 8 is provided. The two ends of the limiting member 8 are supported by the second side plate 72 and the fixing seat 9 respectively, so as to realize the positioning and installation of the limiting member 8. The limiting part 82 at both ends of the limiting rod 81 limits the limiting rod 81 between the second side plate 72 and the fixing seat 9, so as to prevent the limiting rod 81 from coming out of the first mounting hole 91 or the second mounting hole 721.

[0085] Furthermore, the above installation method does not restrict the rotation of the limiting member 8. During the rotation of the rope drum 3, the limiting member 8 and the pull rope 31 on the rope drum 3 will rub against each other. Under the action of friction, the limiting member 8 will rotate, so that there is rolling friction between the limiting member 8 and the pull rope 31. While playing a limiting role, it can reduce the friction force and avoid hindering the rotation of the rope drum 3.

[0086] 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.

[0087] In some embodiments, such as Figures 1-5 as well as Figure 7 As shown, a reducer 10 is also provided between the drive source 1 and the gearbox 4. The input end of the reducer 10 is connected to the output shaft 11 of the drive source 1, and the output end of the reducer 10 is connected to the drive gear 41 and the rotating shaft 2 of the gearbox 4 to change the magnitude of the torque output by the drive source 1.

[0088] The reducer 10 is used to change the speed and torque output by the output shaft 11 of the drive source 1. The transmission ratio of the reducer 10 is the ratio of the input speed to the output speed. When the transmission ratio is greater than 1, the reducer 10 makes the output speed less than the input speed. 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, when the output speed decreases, the output torque increases, which increases the training resistance without changing the motor power, thus improving the training intensity and achieving a better training effect. The transmission ratio of the reducer 10 can be selected according to the required training resistance.

[0089] 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 10 is 4, then the output speed of the reducer 10 is 1 / 4 of the input speed, and the output torque of the reducer 10 is 4 times the output torque of the drive source 1, increasing the torque to 40 N·m.

[0090] In some embodiments, the output end of the reducer 10 is provided with a reducer output shaft 101, which is synchronously rotatably connected to the rotating shaft 2. The output shaft 11 of the drive source 1, the reducer output shaft 101, and the rotating shaft 2 are coaxially arranged. This arrangement ensures that the torque is always output through the same axis, avoiding eccentricity during rotation and improving the lifespan of the device and the reliability of the resistance output. The output shaft of the reducer 10 can pass through the drive gear 41 and connect to the rotating shaft 2, allowing the reducer 10 to simultaneously drive both the drive gear 41 and the rotating shaft 2.

[0091] In some embodiments, such as Figures 12-13 As shown, the reducer 10 can be a planetary gear reducer. Specifically, the reducer 10 includes a reducer housing 102, within which an inner chamber 103 is defined. The inner wall surface of the inner chamber 103 is provided with internal teeth to form an internal gear ring 104. A central gear 105 and a plurality of planetary gears 106 are provided in the inner chamber 103. The central gear 105 is synchronously rotatably connected to the output shaft 11 of the drive source 1, and each planetary gear 106 meshes with both the central gear 105 and the internal gear ring 104 simultaneously.

[0092] The planetary gear reducer receives power from the drive source 1 through the central gear 105 (also known as the sun gear), which actively rotates and drives the planetary gears 106. There are typically 3 to 6 planetary gears 106, evenly distributed around the central gear 105, meshing with both the central gear 105 and the internal gear ring 104. Each planetary gear 106 rotates on its own axis and revolves around the central gear 105. The planetary gear reducer 10 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.

[0093] like Figure 12 and Figure 14 As shown, the reducer 10 also includes an output flange 107. The output shaft 101 of the reducer is fixedly connected to the outside of the output flange 107. The inside of the output flange 107 is provided with multiple planetary shafts 108 corresponding to multiple planetary gears 106. Each planetary shaft 108 is rotatably connected to the center of the corresponding planetary gear 106.

[0094] The central gear 105 is synchronously connected to the output shaft 11 of the drive source 1, and inputs the torque of the drive source 1 into the reducer 10. The planetary gear 106 rotates around the central gear 105 under the drive of the central gear 105, and drives the output flange 107 to rotate through the revolution of the planetary shaft 108, so that the torque adjusted by the reducer 10 is output from the reducer output shaft 101.

[0095] In some embodiments, an axially extending external spline 21 is formed on the outer surface of the rotating shaft 2; such as Figure 10 The end of the winding drum 3 away from the linkage 5 extends radially inward to form a mating end face 33. The mating end face 33 has an assembly hole 34 for the rotating shaft 2 to pass through. An inner spline 35 is provided axially at the assembly hole 34. The inner spline 35 is adapted to the outer spline 21 so that the winding drum 3 and the rotating shaft 2 rotate synchronously.

[0096] The rotating shaft 2 passes through the mounting hole 34 of the rope drum 3, and engages with the external spline 21 on the rotating shaft 2 via the internal spline 35 at the mounting hole 34, transmitting the torque of the rotating shaft 2 to the rope drum 3. The external spline 21 extends axially along the rotating shaft 2, ensuring a stable spline engagement with the rotating shaft 2 throughout the entire axial direction during the sliding process of the rope drum 3 along the rotating shaft 2, thereby improving the reliability of torque transmission.

[0097] In some embodiments, such as Figure 10 As shown, the end face of the winding drum 3 has multiple rope holes 36 near the outer periphery, and the multiple rope holes 36 are evenly distributed along the circumference of the end face; the end of the pull rope 31 passes through the multiple rope holes 36 in sequence and is knotted at the end to fix the end of the pull rope 31 to the winding drum 3.

[0098] One end of the pull rope 31 is fixed to the rope winding drum 3 through the rope hole 36. The pull rope 31 is wound around the rope winding drum 3, and the other end of the pull rope 31 is led outward as the user's force application end. By opening multiple rope holes 36 circumferentially on the end face of the rope winding drum 3, the pull rope 31 is wound around each rope hole 36 in sequence, so that the force exerted on the rope winding drum 3 by the end of the pull rope 31 is evenly distributed, preventing stress concentration at the fixed position due to single-point force, which could lead to damage to the fixed position.

[0099] The rope winding cylinder 3 may have a rope hole 36 formed on only one end face, or it may have rope holes 36 formed on both end faces.

[0100] In some embodiments, the winding drum 3 includes a rope winding surface, on which the rope 31 is wound. Multiple rope-threading holes 36 are arranged radially inward relative to the rope winding surface of the winding drum 3. Because the rope-threading holes 36 are positioned inward relative to the rope winding surface, after the rope 31 is fixed at the end of the winding drum 3, it is guided radially outward to the rope winding surface for winding. This can, to some extent, obscure the fixed position of the rope 31, preventing any impact on the starting point position of the rope winding.

[0101] like Figure 10 As shown, the rope winding surface of the rope winding cylinder 3 is recessed inward to form multiple grooves 37, and each rope hole 36 is correspondingly provided with one groove 37. The grooves 37 formed on the rope winding surface corresponding to the rope hole 36 make it easy for the rope 31 to pass through the rope hole 36, and can hide the knotted part of the rope 31 in the grooves 37 below the winding surface, improving the aesthetics.

[0102] Optionally, the groove 37 is located near the rope hole 36. The groove 37 is formed only near the rope hole 36 and is located on the same radial direction as the rope hole 36, so as to facilitate the passage of the pull rope 31.

[0103] The outer diameter of the two end faces of the rope winding cylinder 3 is larger than the outer diameter of the rope winding surface, so that the rope 31 can be limited from both ends to prevent the rope 31 from falling off from both sides.

[0104] This application also provides a fitness equipment, which includes a resistance transmission device as described in any of the above embodiments. Through the cooperation of the gearbox 4, screw 6, and linkage 5, the resistance transmission device drives the axial movement of the rope drum 3, guiding the ropes 31 to be arranged in an orderly manner. During the retraction and extension of the ropes 31, problems such as stacking and knotting are basically avoided, ensuring the continuity of training and improving the user experience.

[0105] 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.

[0106] 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 in that, include: A drive source, which rotates through its output shaft to provide torque; A gearbox, comprising a driving gear and a driven gear, wherein the driving gear is connected to the output shaft of the drive source, the driven gear meshes with the driving gear, and the driven gear has an internal threaded hole at its center; A rotating shaft is located on the side of the gearbox away from the drive source, and the rotating shaft is connected to the output shaft of the drive source in a driving connection. A rope winding cylinder, the outer circumference of which is used to wind a pull rope, the rope winding cylinder is sleeved outside the rotating shaft, the rope winding cylinder rotates synchronously with the rotating shaft, and the rope winding cylinder can slide along the axial direction of the rotating shaft; A linkage is disposed on the side of the rope winding drum away from the gearbox, opposite to the gearbox, and the linkage is configured to move synchronously with the rope winding drum along the axial direction of the rotation axis; A screw, which is parallel to the rotation axis, has one end connected to the linkage and the other end inserted into the internal thread hole of the driven gear. The rotation of the driving gear drives the rotation of the driven gear, which in turn drives the screw to rotate and move linearly along the axial direction, so that the linkage and the rope winding drum move linearly along the axial direction of the rotation axis.

2. The resistance transmission device according to claim 1, characterized in that, The driven gear is provided in multiple ways, and the multiple driven gears are distributed in the circumferential direction of the driving gear and mesh with the driving gear; The screw has multiple screws corresponding to multiple driven gears. One end of each screw is connected to the linkage, and the other end is threadedly engaged with the corresponding driven gear.

3. The resistance transmission device according to claim 1 or 2, characterized in that, The linkage includes a first clamping plate and a second clamping plate that are disposed opposite to each other; The end face of the rope winding cylinder near the linkage extends radially outward to form a clamping part, which is clamped between the first clamping plate and the second clamping plate.

4. The resistance transmission device according to claim 3, 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 gearbox is rotatably mounted on the second side plate.

5. The resistance transmission device according to claim 4, 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. The fixing base is fixed to the connecting plate; One end of each limiting member is connected to the fixing seat, and the other end passes through the first clamping plate and the second clamping plate in sequence and is connected to the second side plate.

6. The resistance transmission device according to claim 5, characterized in that, Each of the limiting members includes a limiting rod and limiting portions located at both ends of the limiting rod; The fixed base has a plurality of first mounting holes corresponding to the plurality of limiting members, and the second side plate has a plurality of second mounting holes corresponding to the plurality of 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 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 that the limiting rod can be rotatably installed between the fixed base and the second side plate.

7. The resistance transmission device according to claim 1, characterized in that, A reducer is also provided between the drive source and the gearbox. The input end of the reducer is connected to the output shaft of the drive source, and the output end of the reducer is connected to the drive gear and the rotating shaft of the gearbox to change the magnitude of the torque output by the drive source.

8. The resistance transmission device according to claim 4, 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.

9. 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.

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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