Resistance transmission device and fitness equipment

Abstract

This application relates to a resistance transmission device and fitness equipment. The resistance transmission device includes: a drive source, two sets of cable retraction and release assemblies, and a differential; the drive source rotates via its output shaft to provide torque; each cable retraction and release assembly includes a rotating shaft, which rotates to wind and store the cable or release it outwards; the two rotating shafts of the two cable retraction and release assemblies are coaxially arranged, with a gap between their opposite ends; the differential is located between the opposite ends of the two rotating shafts, is drively connected to the output shaft of the drive source, and is configured to transmit torque to the two rotating shafts and allow them to rotate at the same speed or at a different speed. The resistance transmission device is equipped with two sets of cable retraction and release assemblies and allows the two cables to be retracted and released at different speeds, achieving dual-axis output and meeting the needs of differentiated training.

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 users with the resistance needed for training through pulley systems, ropes, and resistance bands, thereby meeting the basic training needs of different groups of people.

[0003] As fitness equipment continues to evolve towards intelligent technology, some training equipment has incorporated motor-driven systems, enabling dynamic resistance adjustment. Through motor drive, the equipment can offer more diverse training modes, greatly enriching the training experience and significantly improving the user experience.

[0004] The existing motor drive system adopts a single-axis output design. The resistance provided by the motor is simultaneously output to both hands through a pull rope. This cannot meet the need for separate and independent training of the left and right hands, making it difficult for the equipment to meet the user's need for differentiated training of the left and right hands. This limits the targeting and flexibility of training and makes it difficult to achieve the ideal training effect. Utility Model Content

[0005] To address at least one shortcoming in the related technology, this application provides a resistance transmission device and fitness equipment, equipped with two sets of rope retraction and release components, and allowing the two ropes to be retracted and released at different speeds to achieve dual-axis output and meet the needs of differentiated training.

[0006] This application provides a resistance transmission device, including: a drive source, two sets of rope take-up and release assemblies, and a differential; the drive source rotates via its output shaft to provide torque; each rope take-up and release assembly includes a rotating shaft, which rotates to wind and store the rope or release the rope outward; the two rotating shafts of the two sets of rope take-up and release assemblies are coaxially arranged, and there is a gap between their opposite ends; the differential is located between the opposite ends of the two rotating shafts, and the differential is drively connected to the output shaft of the drive source, and is configured to: transmit torque to the two rotating shafts and allow the two rotating shafts to rotate at the same speed or at a different speed.

[0007] In some embodiments, the differential includes: a drive gear, a driven gear, two output gears, and a planetary gear; the drive gear is connected to the output shaft of a drive source and is driven to rotate; the driven gear meshes with the drive gear and is used to receive the power output of the drive gear, and the shaft of the driven gear is coaxially arranged with the two rotating shafts; the two output gears are respectively connected to the opposite ends of the two rotating shafts and rotate synchronously with the corresponding rotating shafts; the planetary gear can rotate about its own axis, the planetary gear is disposed between the two output gears and meshes with the two output gears respectively, the planetary gear is connected to the driven gear, and rotates synchronously with the driven gear.

[0008] In some embodiments, the resistance transmission device further includes a locking component configured to restrict the rotation of either or both of the two rotating shafts; the resistance transmission device includes at least two states: both rotating shafts are unrestricted and rotatable, and one rotating shaft is restricted in its rotation while the other rotating shaft is rotatable.

[0009] In some embodiments, the locking assembly includes: two locking gears, two locking members, and a drive member; the two locking gears are respectively rotatably connected to two rotating shafts; the two locking members correspond to the two locking gears respectively and are disposed close to the tooth surface of the corresponding locking gear; the drive member is configured to selectively drive either of the two locking members to move toward the corresponding locking gear and insert into the tooth groove of the locking gear to restrict the rotation of the locking gear.

[0010] In some embodiments, two locking members are located on the same side of two locking gears, and the two ends of each locking member in the axial direction are a first end and a second end, respectively, with the first end close to the locking gear; the locking members are disposed opposite to the tooth surface of the locking gear in the axial direction; the driving member includes a rotating seat, which is disposed close to the second end of the two locking members, and the rotation plane of the rotating seat is perpendicular to the axial direction of the locking members; the rotating seat has grooves corresponding to the two locking members respectively, and the second end of the locking member contacts the bottom of the groove;

[0011] The point on the outer periphery of the locking gear that is close to the locking element and located on the axial direction of the locking element is the locking critical point, and the plane perpendicular to the axial direction of the locking element where the locking critical point is located is the locking critical surface.

[0012] The groove bottom includes a first surface and a second surface; the distance between the first surface and the locking critical surface is greater than the axial length of the locking member; when the second end of the locking member contacts the first surface, the first end of the locking member does not exceed the locking critical point and therefore is not inserted into the tooth groove; the distance between the second surface and the locking critical surface is less than the axial length of the locking member; or, in the direction away from the first surface, the distance between the second surface and the locking critical surface gradually decreases to less than the axial length of the locking member; when the second end of the locking member contacts the second surface and the first end exceeds the locking critical point, the locking member is inserted into the tooth groove, restricting the rotation of the locking gear.

[0013] In some embodiments, the resistance transmission device further includes a mounting bracket; the mounting bracket 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 two ends of the two rotating shafts, which are far apart from each other, are respectively mounted on the first side plate and the second side plate; the rotating seat is rotatably mounted on the outer surface of the connecting plate; the connecting plate has an opening corresponding to the two locking members, and the first ends of the two locking members pass through the opening to engage with the locking gear.

[0014] In some embodiments, the resistance transmission device further includes two fixed seats, which are disposed between the first side plate and the second side plate and mounted on the inner surface of the connecting plate; the opposite ends of the two rotating shafts are respectively supported by the two fixed seats, and the two locking gears are respectively disposed close to the two fixed seats;

[0015] Two support members are installed on each fixed base. The two support members are spaced apart axially on the locking member. Each support member has a through hole for the locking member to pass through. The locking member passes through the two support members and its two ends protrude from the two sides of the two support members respectively. An elastic member is provided between the two support members. One end of the elastic member abuts against one of the support members, and the other end is connected to the locking member. The elastic member is configured to keep the second end of the locking member pressed against the bottom of the groove.

[0016] In some embodiments, the two locking members are located on the same side of the two locking gears, and the two ends of each locking member in the axial direction are a first end and a second end, respectively, with the first end close to the locking gear;

[0017] The driving component includes a sliding seat, the sliding direction of which is the same as the extension direction of the tooth groove of the locking gear;

[0018] Two locking elements are respectively installed at both ends of the sliding block in the sliding direction, and the distance between the two locking elements is greater than the distance between the two locking gears. The first end of the locking element falls into the tooth groove along the projection in the sliding direction.

[0019] By sliding the sliding seat, one of the locking elements moves closer to the corresponding locking gear and inserts into the tooth groove of the locking gear, thus restricting the rotation of the locking gear.

[0020] In some embodiments, the resistance transmission device further includes a mounting bracket and two fixed bases;

[0021] The mounting bracket includes a first side plate and a second side plate arranged opposite to each other, and a connecting plate connecting the first side plate and the second side plate; the two ends of the two rotating shafts that are far apart from each other are respectively mounted on the first side plate and the second side plate; the sliding seat is slidably mounted on the outer surface of the connecting plate; the connecting plate has an opening corresponding to the sliding stroke of the two locking members, and the first ends of the two locking members pass through the opening to cooperate with the locking gear.

[0022] Two fixed seats are located between the first side plate and the second side plate, and are installed on the inner surface of the connecting plate; the opposite ends of the two rotating shafts are supported by the fixed seats respectively, and the two locking gears are respectively located close to the two fixed seats; an elastic element is provided between the fixed seat and the corresponding locking element, and the elastic element is in a compressed state; a magnetic element is installed on the sliding seat, the magnetic element is located on the side of the locking element facing the fixed seat, the magnetic element is located in the opening, and attracts the side wall opposite to the magnetic element in the opening through magnetic action.

[0023] This application also provides a fitness device including the resistance transmission device as described in any of the preceding claims.

[0024] Compared with existing technologies, the advantages and positive effects of this application are as follows: The resistance transmission device in this application is equipped with two sets of rope retraction and release assemblies, giving the resistance transmission device two output ends for external force application; simultaneously, a differential gear is provided between the two rotating shafts, allowing the rotating shafts of the two rope retraction and release assemblies to rotate at different speeds when the external tension on the two sets of ropes is different, thus giving the resistance transmission device a dual-axis output effect. When the resistance transmission device in this application is applied to fitness equipment, the two ropes are used for the exerciser's two arms respectively, meeting the needs of differentiated training and improving the targeting and flexibility of training. Attached Figure Description

[0025] 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:

[0026] Figure 1 A three-dimensional representation of an embodiment of the resistance transmission device of this application Figure 1 ;

[0027] Figure 2 A three-dimensional representation of an embodiment of the resistance transmission device of this application Figure 2 ;

[0028] Figure 3 This is a front view of an embodiment of the resistance transmission device of this application, wherein the pull rope is in a wound state;

[0029] Figure 4 This is a side view of one embodiment of the resistance transmission device of this application;

[0030] Figure 5 This is a top view of one embodiment of the resistance transmission device of this application;

[0031] Figure 6 for Figure 5 The resistance transmission device shown is a cross-sectional view along section line AA.

[0032] Figure 7 This is a front view of an embodiment of the resistance transmission device of this application, wherein the pull rope is released;

[0033] Figure 8 for Figure 7 A cross-sectional view of the resistance transmission device shown in the figure;

[0034] Figure 9 This is a front view of the rotary shaft, differential, and locking assembly in one embodiment of this application;

[0035] Figure 10 This is a top view of the rotary shaft, differential, and locking assembly in one embodiment of this application;

[0036] Figure 11 A three-dimensional representation of the rotary shaft, differential, and locking assembly in one embodiment of this application. Figure 1 ;

[0037] Figure 12 A three-dimensional representation of the rotary shaft, differential, and locking assembly in one embodiment of this application. Figure 2 ;

[0038] Figure 13 This is a front view of an embodiment of the locking component of this application, wherein the two locking gears are in an unlocked state;

[0039] Figure 14 for Figure 13 The top view of the locking component shown;

[0040] Figure 15 for Figure 14 The locking component shown is a cross-sectional view along the BB section line;

[0041] Figure 16 for Figure 13 The locking assembly shown is a cross-sectional view along one of the locking gear facets;

[0042] Figure 17 This is a front view of one embodiment of the locking component of this application, wherein one locking gear is in a locked state;

[0043] Figure 18 for Figure 17 The top view of the locking component shown;

[0044] Figure 19 for Figure 18 The locking component shown is a cross-sectional view along the CC section line.

[0045] Figure 20 for Figure 17The diagram shows a cross-sectional view of the locking assembly along one of the locking gear facets, wherein the locking gear is in a locked state;

[0046] Figure 21 This is a bottom view of one embodiment of the rotary seat in this application;

[0047] Figure 22 This is a partial enlarged view of the rotary seat in one embodiment of the resistance transmission device of this application, wherein the mounting bracket has been removed;

[0048] Figure 23 This is a perspective view of another embodiment of the resistance transmission device of this application;

[0049] Figure 24 This is a front view of another embodiment of the resistance transmission device of this application, wherein the pull rope is in a wound state;

[0050] Figure 25 This is a top view of another embodiment of the resistance transmission device of this application;

[0051] Figure 26 for Figure 25 A cross-sectional view of the resistance transmission device shown along the DD section line.

[0052] Figure 27 for Figure 26 A magnified view of the central part E;

[0053] Figure 28 This is a front view of another embodiment of the locking component of this application, wherein the two locking gears are in an unlocked state;

[0054] Figure 29 for Figure 28 The top view of the locking component shown;

[0055] Figure 30 for Figure 29 The locking component shown is a cross-sectional view along the FF section line;

[0056] Figure 31 for Figure 30 A cross-sectional view of the locking gear on one side of the locking assembly in the locked state;

[0057] Figure 32 A three-dimensional representation of an embodiment of the rope winding tube of this application Figure 1 ;

[0058] Figure 33 A three-dimensional representation of an embodiment of the rope winding tube of this application Figure 2 .

[0059] In the picture:

[0060] 1. Drive source; 11. Output shaft of drive source; 2. Rope winding assembly; 21. Rotating shaft; 211. External spline; 22. Rope; 23. Inner cylinder; 24. Rope winding cylinder; 241. Mating end face; 242. Assembly hole; 243. Internal spline; 244. Rope threading hole; 25. Limiting component; 3. Differential; 31. Drive gear; 32. Driven gear; 33. Output gear; 34. Planetary gear; 35. Planetary carrier; 4. Mounting bracket; 41. First side plate; 42. Second side plate; 43. Third side plate; 44. Connecting plate; 441. Opening; 442. Outlet; 45. Fixing seat; 5. Locking assembly; 501. Locking critical point; 51. Locking gear; 511. Tooth gap; 5101. First locking gear; 5102. Second locking gear; 52. Locking element; 521. Protrusion; 5201. First locking element; 5202. Second locking element; 53. Driving element; 6. Rotating seat; 61. Groove; 611. First surface; 612. Second surface; 6101. First groove; 6102. Second groove; 7. Sliding seat; 71. Fixing part; 711. First fixing plate; 712. Second fixing plate; 72. Sliding guide shaft; 8. Operating part; 9. Support element; 10. Elastic element; 101. Magnetic element. Detailed Implementation

[0061] 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.

[0062] 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.

[0063] In the description of this application, it should be understood that the terms "vertical," "horizontal," "top," "bottom," "inner," "outer," "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," "second," and "third" 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.

[0064] 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.

[0065] This application provides a resistance transmission device, such as... Figures 1-12 and Figures 23-26 As shown, it includes: a drive source 1, two sets of rope retraction and extension components 2, and a differential 3.

[0066] Torque is provided by rotating the output shaft 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 any existing power component capable of providing torque, such as a servo motor.

[0067] Each pull cord retraction assembly 2 includes a rotating shaft 21, which rotates to wind and store the pull cord 22 or to extend the pull cord 22 outward. The pull cord retraction assembly 2 can be constructed using any component or combination of components capable of retracting or extending the pull cord 22. In some embodiments, the pull cord 22 can be directly wound around the rotating shaft 21 for retraction or extension; in other embodiments, the pull cord 22 is wound around other components that cooperate with the rotating shaft 21.

[0068] The two rotating shafts 21 of the two sets of pull rope retraction components 2 are coaxially arranged, and there is a gap between the opposite ends.

[0069] The differential 3 is located between the opposite ends of the two rotating shafts 21. The differential 3 is drive-connected to the output shaft of the drive source 1 and is configured to transmit torque to the two rotating shafts 21 and allow the two rotating shafts 21 to rotate at the same speed or at different speeds. By setting the differential 3 between the two rotating shafts 21, when the loads on the two shafts are inconsistent, the differential 3 can allow the two shafts to rotate at different speeds to achieve the differential function.

[0070] The aforementioned resistance transmission device is equipped with two sets of cable retraction and extension components 2. The cable 22 of the two sets of cable retraction and extension components 2 can be independently extended outward, giving the resistance transmission device two output ends for external force application. The external force changes the direction of rotation of the rotating shaft 21 by overcoming the resistance of the drive source 1. At the same time, a differential 3 is provided between the two rotating shafts 21, allowing the two rotating shafts 21 to rotate at corresponding speeds when the external tension on the two sets of cable 22 is different. Through the above scheme, the resistance transmission device has a dual-axis output effect. When applied to fitness equipment, the two cable 22 are used for the exerciser's two arms respectively, meeting the needs of differentiated training for the left and right hands, and improving the targeting and flexibility of training.

[0071] In some embodiments, such as Figures 9-12 As shown, the differential 3 includes a drive gear 31, a driven gear 32, two output gears 33, and a planetary gear 34. The drive gear 31 is connected to the output shaft of the drive source 1 and is driven by rotation. The driven gear 32 meshes with the drive gear 31 and receives the power output from the drive gear 31. The two output gears 33 are respectively connected to the opposite ends of two rotating shafts 21 and rotate synchronously with the corresponding rotating shafts 21. The planetary gear 34 can rotate about its own axis. The planetary gear 34 is located between the two output gears 33 and meshes with each of the two output gears 33. The planetary gear 34 is connected to the driven gear 32 and rotates synchronously with the driven gear 32.

[0072] During the operation of the differential 3, the drive gear 31 rotates with the output shaft of the drive source 1, and drives the driven gear 32 meshing with it to rotate; as the driven gear 32 rotates, the planetary gear 34 revolves around the rotation axis of the driven gear 32; the revolution of the planetary gear 34 drives the two output gears 33 to rotate, which in turn causes the two rotating shafts 21 to rotate.

[0073] When the external forces input from the two pull ropes 22 to the two rotating shafts 21 are equal, the two rotating shafts 21 rotate synchronously, and the planetary gear 34 only revolves around the sun and does not rotate on its own axis; when the external forces input from the two pull ropes 22 to the two rotating shafts 21 are not equal or the rotation of one of the rotating shafts 21 is restricted, the rotational speeds of the two rotating shafts 21 are different, and the planetary gear 34 rotates on its own axis while revolving around the sun.

[0074] In some embodiments, such as Figure 9As shown, there are two planetary gears 34, which are respectively arranged on both sides of the output gear 33 in the radial direction to improve the stability of the transmission.

[0075] In some embodiments, such as Figures 9-12 As shown, the driven gear 32 is located on one side of the two output gears 33 in the axial direction and is circumferentially mounted on one of the rotating shafts 21.

[0076] In some embodiments, such as Figures 9-12 As shown, a planet carrier 35 is fixed on the surface of the driven gear 32, and the number of planet carriers 35 is equal to the number of planet gears 34. The planet carriers 35 extend between the two output gears 33 in a direction parallel to the rotation axis of the driven gear 32, and the planet gears 34 are rotatably mounted on the planet carriers 35. Through the planet carriers 35, the planet gears 34 and the driven gear 32 rotate synchronously to achieve revolution.

[0077] Optionally, both the output gear 33 and the planetary gear 34 are bevel gears, with the conical tooth surfaces of the two output gears 33 facing each other and meshing with the conical tooth surfaces of the planetary gear 34 respectively.

[0078] In some embodiments, such as Figures 1-8 and Figures 23-26 As shown, the resistance transmission device also includes a mounting frame 4; the mounting frame 4 includes a first side plate 41 and a second side plate 42 arranged opposite to each other, and a connecting plate 44 connecting the first side plate 41 and the second side plate 42; the two rotating shafts 21 are respectively mounted on the first side plate 41 and the second side plate 42 at their far ends.

[0079] In some embodiments, such as Figure 1-3 and Figures 6-8 As shown, the resistance transmission device also includes two fixed seats 45, which are located between the first side plate 41 and the second side plate 42 and mounted on the inner surface of the connecting plate 44; the opposite ends of the two rotating shafts 21 are supported by the two fixed seats 45 respectively. By cooperating with the first side plate 41 and the second side plate 42 respectively, the two ends of the two rotating shafts 21 are installed, ensuring the overall reliability of the device.

[0080] In some embodiments, the differential 3 is mounted between two fixed mounts 45. Specifically, as shown... Figures 1-3 , Figure 23 and Figure 24As shown, the opposite ends of the two rotating shafts 21 pass through the corresponding fixed seats 45 and extend between the two fixed seats 45. The two output gears 33 are respectively installed at the ends of the corresponding rotating shafts 21 and located between the two fixed seats 45. The driven gear 32 is located between one of the output gears 33 and its corresponding fixed seat 45. The drive source 1 is set close to the two fixed seats 45, and the output shaft extends between the two fixed seats 45. The drive gear 31 is installed at the end of the output shaft, and the drive gear 31 meshes with the driven gear 32.

[0081] In some embodiments, such as Figure 2 As shown, the mounting bracket 4 also includes a third side plate 43, which is connected to the connecting plate 44 and is located near the fixing base 45. The third side plate 43 is used to mount the drive source 1.

[0082] In some embodiments, the resistance transmission device further includes a locking component 5 configured to restrict the rotation of either or both of the two rotating shafts 21. The resistance transmission device includes at least two states: both rotating shafts 21 are unrestricted and rotatable, and one rotating shaft 21 is restricted in its rotation while the other rotating shaft 21 is rotatable.

[0083] The design of locking component 5 allows for multiple output states of the resistance transmission device, meeting the application needs of different scenarios. For example, when both arms need to be trained simultaneously, locking component 5 remains unlocked on both rotation axes 21, allowing both arms to input force to their respective rotation axes 21 via the two pull ropes 22. When only one arm needs to be trained, locking component 5 is operated to lock the rotation axis 21 corresponding to the other arm, while the rotation of the rotation axis 21 corresponding to the target arm is unrestricted, allowing training only for the target arm.

[0084] In a first embodiment of the locking component 5, a locking component 5 is provided for each rotating shaft 21, and each locking component 5 is independently used to lock the rotation of the corresponding rotating shaft 21. In this case, the resistance transmission device also includes a third state, in which the rotation of both rotating shafts 21 is restricted.

[0085] In some embodiments of the above implementation, each locking assembly 5 includes a locking gear 51, a locking member 52, and a driving member 53; the locking gear 51 is synchronously rotatably connected to the corresponding rotating shaft 21; the locking member 52 is disposed near the tooth surface of the locking gear 51; the driving member 53 is configured to drive the locking member 52 to move toward the locking gear 51 and insert into the tooth groove of the locking gear 51. The driving member 53 can be implemented in various ways, and those skilled in the art can use existing components or combinations of existing components in the art to implement it; this application does not impose any limitations.

[0086] In a second embodiment of the locking component 5, the locking component 5 is configured to selectively restrict the rotation of either of the two rotation axes 21. Optionally, as... Figures 9-12 As shown, the locking assembly 5 includes two locking gears 51, two locking members 52, and a driving member 53. The two locking gears 51 are synchronously connected to two rotating shafts 21, respectively; the two locking members 52 correspond to the two locking gears 51 and are disposed close to the tooth surface of the corresponding locking gear 51; the driving member 53 is configured to selectively drive either of the two locking members 52 to move toward the corresponding locking gear 51 and insert into the tooth groove of the locking gear 51 to restrict the rotation of the locking gear 51.

[0087] In the second embodiment described above, to facilitate the setting of the driving member 53, the two locking members 52 are located on the same side of the two locking gears 51, and the two ends of each locking member 52 in the axial direction are a first end and a second end, wherein the first end is close to the locking gear 51. Based on this, two implementation methods of the driving member 53 are provided below.

[0088] The first implementation of the driving component 53 uses rotation for driving, see reference. Figures 1-22 At this time, the locking member 52 is axially opposed to the tooth surface of the locking gear 51. The following describes various embodiments of the first implementation of the driving member 53.

[0089] like Figures 13-21 As shown, the driving component 53 includes a rotating seat 6, which is located near the second ends of the two locking components 52. The rotating plane of the rotating seat 6 is perpendicular to the axial direction of the locking components 52. The rotating seat 6 has grooves 61 respectively corresponding to the two locking components 52, and the second end of the locking component 52 contacts the bottom of the groove 61.

[0090] like Figure 16 As shown, the point on the outer periphery of the locking gear 51 near the locking member 52 and located axially on the locking member 52 is the locking critical point 501, and the plane perpendicular to the axial direction of the locking member 52 where the locking critical point 501 is located is the locking critical surface. Figure 20 As shown, when the locking member 52 moves close to the locking gear 51 and exceeds the locking critical point 501, the locking member 52 inserts into the tooth groove and restricts the rotation of the locking gear 51.

[0091] like Figure 16 , Figure 20 and Figure 21 As shown, the bottom of the groove 61 includes a first surface 611 and a second surface 612.

[0092] The distance between the first surface 611 and the locking critical surface is greater than the axial length of the locking member 52. When the second end of the locking member 52 contacts the first surface 611, it does not exceed the locking critical point 501 and therefore is not inserted into the tooth groove, presenting an unlocked state for the locking gear 51. In some embodiments, the first surface 611 is parallel to the rotation plane of the rotating seat 6; in other embodiments, the first surface 611 is set at an angle to the rotation plane; as long as the distance between the first surface 611 and the locking critical surface is greater than or equal to the axial length of the locking member 52, this application is not limited.

[0093] The distance between the second surface 612 and the locking critical surface is less than the axial length of the locking member 52. Alternatively, in the direction away from the first surface 611, the distance between the second surface 612 and the locking critical surface gradually decreases to less than the axial length of the locking member 52. That is, at least a portion of the second surface 612 is less than the axial length of the locking member 52 when it contacts this portion. When the second end of the locking member 52 contacts this portion, the first end extends beyond the locking critical point 501 and inserts into the tooth groove, restricting the rotation of the locking gear 51.

[0094] When the rotating seat 6 rotates, causing the locking member 52 to move from the first surface 611 to the second surface 612, the locking member 52 moves towards the locking gear 51 until it is inserted into the tooth groove, thereby restricting the rotation of the locking gear 51. Figure 20 As shown.

[0095] When the rotating seat 6 causes the locking member 52 to move from the second surface 612 to the first surface 611, the locking member 52 moves away from the locking gear 51 until it disengages from the tooth groove, thereby releasing the restriction on the locking gear 51. Figure 16 As shown.

[0096] The second end of the first locking member 5201 is inserted into the first groove 6101 of the rotating seat 6 and is used to restrict the rotation of the first locking gear 5101. The second end of the second locking member 5202 is inserted into the second groove 6102 of the rotating seat 6 and is used to restrict the rotation of the second locking gear 5102.

[0097] In some embodiments, such as Figure 21 As shown, in the rotational direction, the first surface 611 of the first groove 6101 is adjacent to the first surface 611 of the second groove 6102, and the second surface 612 of the first groove 6101 is adjacent to the second surface 612 of the second groove 6102.

[0098] When the rotating seat 6 is in the unlocked position, the second end of the first locking member 5201 and the second end of the second locking member 5202 are both in contact with the first surface 611 of the corresponding groove 61, such as Figure 15 As shown.

[0099] like Figures 18-20 As shown, when the rotary seat 6 is rotated from the unlocked position in the first direction, the second surface 612 of the first groove 6101 moves to contact the first locking member 5201, driving the first locking member 5201 to move towards the first locking gear 5101 and insert into the tooth groove, thus locking the first locking gear 5101; the second end of the second locking member 5202 remains in contact with the first surface 611 of the second groove 6102 and does not lock. At this time, rotating the rotary seat 6 in the opposite direction to the unlocked position can release the lock on the first locking gear 5101.

[0100] When the rotary seat 6 is rotated from the unlocked position to the second direction, the second surface 612 of the second groove 6102 moves to contact the second locking member 5202, driving the second locking member 5202 to move towards the second locking gear 5102 and insert into the tooth groove, thus locking the second locking gear 5102; the second end of the first locking member 5201 remains in contact with the first surface 611 of the first groove 6101 and does not lock. At this time, rotating the rotary seat 6 in the opposite direction to the unlocked position will release the lock on the second locking gear 5102.

[0101] In some embodiments, to improve the smoothness of movement of the locking member 52, such as Figure 16 and Figure 19 As shown, the first surface 611 and the second surface 612 are connected to each other. The first surface 611 is parallel to the rotation plane of the rotating seat 6 and the distance between it and the locking critical surface is greater than the axial length of the locking member 52. The distance between the second surface 612 and the locking critical surface gradually decreases to less than the axial length of the locking member 52 in the direction away from the first surface 611.

[0102] In some embodiments, the rotating seat 6 is rotatably mounted on the outer surface of the connecting plate 44; the connecting plate 44 has openings 441 corresponding to the two locking members 52, and the first ends of the two locking members 52 pass through the openings 441 to engage with the locking gear 51.

[0103] In some embodiments, the two locking gears 51 are respectively disposed near the two fixed seats 45, for example, as Figure 3 and Figure 24 As shown, the two locking gears 51 are respectively located on two opposite sides of the two fixed seats 45.

[0104] In some embodiments, such as Figure 22As shown, each of the fixed seats 45 is equipped with two support members 9, which are spaced apart axially from the locking member 52. Each support member 9 has a through hole for the locking member 52 to pass through. The locking member 52 passes through the two support members 9 and its two ends extend from the two sides of the two support members 9 respectively. An elastic member 10 is provided between the two support members 9. One end of the elastic member 10 abuts against one of the support members 9, and the other end is connected to the locking member 52. The elastic member 10 is configured to keep the second end of the locking member 52 pressed against the bottom of the groove 61.

[0105] In some embodiments, such as Figure 22 As shown, a protrusion 521 is provided on the locking member 52, and the protrusion 521 is located between the two support members 9; one end of the elastic member 10 abuts against the support member 9 near the first end of the locking member 52, and the other end is connected to the protrusion 521. When the rotating seat 6 is rotated so that the locking member 52 contacts the second surface 612, the elastic restoring force of the elastic member 10 needs to be overcome; when the rotating seat 6 is rotated so that the locking member 52 changes from contact with the second surface 612 to being opposite the first surface 611, the locking member 52 moves away from the locking gear 51 under the action of the elastic restoring force, and the second end presses against the first surface 611.

[0106] The second implementation of the driver 53 uses a sliding method for driving, see reference. Figures 23-31 The following describes various embodiments of the second implementation of the driver 53.

[0107] like Figures 28-30 As shown, the driving component 53 includes a sliding seat 7, the sliding direction of which is the same as the tooth groove extension direction of the locking gear 51. Two locking components 52 are respectively installed at both ends of the sliding seat 7 in the sliding direction, and the distance between the two locking components 52 is greater than the distance between the two locking gears 51. The first end of the locking component 52 falls into the tooth groove along the projection of the sliding direction.

[0108] By sliding the sliding seat 7, one of the locking elements 52 moves closer to the corresponding locking gear 51 and inserts into the tooth groove of the locking gear 51, thus restricting the rotation of the locking gear 51. Figure 31 As shown.

[0109] Since the distance between the two locking elements 52 remains constant, when one locking element 52 moves closer to the corresponding locking gear 51, the other locking element 52 moves away from the locking gear 51 and does not lock. This allows the sliding seat 7 to selectively drive either of the two locking elements 52 toward the corresponding locking gear 51 through two opposite sliding directions, and insert it into the tooth groove of the locking gear 51 to achieve locking.

[0110] The first locking member 5201 corresponds to the first locking gear 5101 and is used to restrict the rotation of the first locking gear 5101, and the second locking member 5202 corresponds to the second locking gear 5102 and is used to restrict the rotation of the second locking gear 5102.

[0111] like Figure 30 As shown, when the sliding seat 7 is in the unlocked position, the first locking member 5201 and the second locking member 5202 are located on both sides of the first locking gear 5101 and the second locking gear 5102, respectively. The sliding seat 7 can slide in either the first direction or the second direction along the sliding direction, with the first direction and the second direction being opposite.

[0112] like Figure 31 As shown, when the sliding seat 7 slides from the unlocked position to the first direction, the first locking member 5201 moves towards the first locking gear 5101 and inserts into the tooth groove of the first locking gear 5101 from the side, locking the first locking gear 5101; the second locking member 5202 moves away from the second locking gear 5102 and does not lock. At this time, sliding to the unlocked position in the second direction can release the lock on the first locking gear 5101.

[0113] When the rotating seat 6 slides from the unlocked position to the second direction, the second locking member 5202 moves closer to the second locking gear 5102 and inserts into the tooth groove of the second locking gear 5102 from the side, locking the second locking gear 5102; the first locking member 5201 moves away from the first locking gear 5101 and does not lock. At this time, sliding it to the unlocked position in the first direction can release the lock on the second locking gear 5102.

[0114] In some embodiments, the sliding seat 7 is slidably mounted on the outer surface of the connecting plate 44; the connecting plate 44 has an opening 441 corresponding to the sliding stroke of the two locking members 52, and the first ends of the two locking members 52 pass through the opening 441 to cooperate with the locking gear 51.

[0115] In some embodiments, the two locking gears 51 are respectively disposed close to the two fixed seats 45. For example, the two locking gears 51 are respectively disposed on opposite sides of the two fixed seats 45 that are far apart from each other. Figure 24 As shown.

[0116] In some embodiments, such as Figure 27 As shown, an elastic element 10 is provided between the fixed base 45 and the corresponding locking element 52, and the elastic element 10 is in a compressed state; a magnetic element 101 is installed on the sliding base 7, the magnetic element 101 is located on the side of the locking element 52 facing the fixed base 45, the magnetic element 101 is located in the opening 441, and attracts each other to the side wall of the opening 441 opposite to the magnetic element 101 through magnetic action.

[0117] In the above embodiment, the elastic member 10 provides a tendency for the locking member 52 to move away from the fixed seat 45 (i.e., away from the locking gear 51), so that the locking member 52 remains in an unlocked state without external force. Through the magnetic attraction between the magnetic member 101 and the sidewall of the opening 441, when an external force pushes the locking member 52 towards the locking gear 51, the magnetic member 101 and the opposite sidewall of the opening 441 approach or adhere to each other, keeping the locking member 52 in a locked state. When unlocking is required, the sliding seat 7 moves in the opposite direction, overcoming the magnetic attraction, so that the locking member 52 moves away from the locking gear 51 to unlock.

[0118] In some embodiments, such as Figure 30 As shown, fixing parts 71 are respectively installed at both ends of the sliding seat 7 in the sliding direction. The fixing parts 71 are used to install locking members 52. The fixing parts 71 include a first fixing plate 711 and a second fixing plate 712 arranged opposite to each other. The locking member 52 is disposed between the first fixing plate 711 and the second fixing plate 712. The first fixing plate 711 is arranged facing the fixing seat 45. The magnetic member 101 is installed on the first fixing plate 711.

[0119] In some embodiments, such as Figure 27 and Figure 28 As shown, a sliding guide shaft 72 is also installed on the sliding seat 7. The sliding guide shaft 72 is arranged along the sliding direction of the sliding seat 7 and passes through two fixing parts 71 and two locking parts 52 at both ends. An elastic member 10 is sleeved on the sliding guide shaft 72, and the two ends of the elastic member 10 abut against the fixing seat 45 and the corresponding first fixing plate 711, respectively.

[0120] Optionally, the elastic element 10 described in this application is a spring.

[0121] Optionally, an operating part 8 is installed on the side of the sliding seat 7 or the rotating seat 6 away from the connecting plate 44. The operating part 8 protrudes relative to the sliding seat 7 or the rotating seat 6 to facilitate the user to perform rotation or sliding operations.

[0122] This application also provides one embodiment of the pull rope retraction assembly 2 for reference, but it is understood that any device or component that can realize pull rope retraction can be installed in the resistance transmission device of this application without mutually exclusive with the above embodiments.

[0123] In some embodiments, in addition to the rotation axis 21, such as Figures 6-8 , Figure 24 and Figure 26 As shown, the rope retraction assembly 2 also includes an inner cylinder 23 and a rope winding cylinder 24.

[0124] The inner cylinder 23 is sleeved outside the rotating shaft 21 and spaced apart from the rotating shaft 21. One end of the inner cylinder 23 is fixed to the mounting bracket 4 in the axial direction. Specifically, the two inner cylinders 23 in the two sets of pull rope retraction assemblies 2 are fixedly connected to the first side plate 41 and the second side plate 42 respectively.

[0125] The outer circumference of the rope winding drum 24 is used to wind the pull rope 22. The inner surface of the rope winding drum 24 has an internal thread, and the outer surface of the inner drum 23 has an external thread. The rope winding drum 24 rotates synchronously with the rotating shaft 21. The rope winding drum 24 is sleeved on the outside of the inner drum 23, and the inner surface of the rope winding drum 24 and the outer surface of the inner drum 23 are in helical drive engagement to convert the rotation of the rope winding drum 24 into sliding along the axial direction of the rotating shaft 21.

[0126] During use, the drive source 1 transmits torque to the rotating shaft 21 through the differential 3, and then to the winding drum 24, causing the winding drum 24 to rotate in a first direction, which is the same as the winding direction of the pull rope 22. Therefore, the pull rope 22 tends to be wound onto the winding drum 24. The first direction is either clockwise or counterclockwise.

[0127] By pulling the rope 22, the torque provided by the drive source 1 is overcome, causing the rope drum 24 to rotate in a second direction, opposite to the first direction. Due to the helical drive between the rope drum 24 and the inner drum 23, the rope drum 24 rotates while moving axially and gradually separating from the inner drum 23. During this axial movement, the rope 22 is wound out one turn after another. Through this process, the resistance transmission device... Figure 3 and Figure 6 The state shown becomes as follows Figure 7 and Figure 8 The state shown.

[0128] When the external force on the pull rope 22 is removed, the output shaft of the drive source 1 resumes rotation along the first direction, thereby driving the rotating shaft 21 and the rope winding drum 24 to rotate again along the first direction. Simultaneously, the rope winding drum 24 moves axially and is fitted onto the inner drum 23, and the pull rope 22 is evenly wound onto the rope winding drum 24, achieving the winding and storage of the pull rope 22. Through the above process, the resistance transmission device... Figure 7 and Figure 8 The state shown is restored to as follows Figure 3 and Figure 6 The state shown.

[0129] Since the two sets of rope retraction and release assemblies 2 are arranged in a mirror symmetrical manner with respect to the differential 3, when the two rotating shafts 21 rotate at the same speed, the movement directions of the rope drum 24 in the two sets of rope retraction and release assemblies 2 are opposite.

[0130] By providing a winding drum 24 to provide a winding base for the pull rope 22, the problem of the pull rope 22 being limited in length due to the diameter of the winding drum 24 being designed according to the required length of the pull rope 22 being directly wound on the rotating shaft 21 is solved. Under the action of the spiral cooperation between the winding drum 24 and the inner drum 23, the winding drum 24 moves axially while the pull rope 22 is being wound and unwound, so that the pull rope 22 can be evenly wound on the winding drum 24, avoiding the phenomenon of stacking.

[0131] It is understood that during the winding and unwinding process of the pull rope 22, the axial movement direction of the rope drum 24 is always opposite to the winding and unwinding direction of the pull rope 22 (i.e., the winding direction or the unwinding 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.

[0132] In some embodiments, the screw drive between the rope winding drum 24 and the inner cylinder 23 is such that the pitch of the screw drive between the rope winding drum 24 and the inner cylinder 23 is equal to or approximately equal to the diameter of the pull rope 22. This causes the rope winding drum 24 to rotate one revolution relative to the inner cylinder 23 when the pull rope 22 is wound around once, so that the exit position of the pull rope 22 remains unchanged in the axial direction.

[0133] In some embodiments, such as Figure 9 As shown, an axially extending external spline 211 is formed on the outer surface of the rotating shaft 21; as Figure 32 and Figure 33 As shown, the end of the winding drum 24 away from the first side plate 41 or the second side plate 42 extends radially inward to form a mating end face 241. The mating end face 241 has an assembly hole 242 for the rotating shaft 21 to pass through. An inner spline 243 is provided axially at the assembly hole 242. The inner spline 243 is adapted to the outer spline 211 so that the winding drum 24 rotates synchronously with the rotating shaft 21.

[0134] In some embodiments, such as Figure 5 and Figure 25 As shown, a guide section 442 is provided on the connecting plate 44 for the pull rope 22 to be led out. The end of the pull rope 22 is led out through the guide section 442 and connected to a force-applying component such as a handle, so that the user can apply external force.

[0135] In some embodiments, the pull cord 22 is led outward via the outlet portion 442 along the tangential direction of the cord drum 24. Optionally, the outlet portion 442 is configured such that its edge does not contact the pull cord 22 passing through it, thereby avoiding wear caused by the pull cord 22 contacting the edge of the outlet portion 442 during the winding and unwinding process, and extending the service life of the pull cord 22.

[0136] Optionally, the connecting plate 44 forms two outlets 442 for each pull rope 22 outlet assembly. The two outlets 442 are located on both sides of the rope winding drum 24 in the radial direction, so that the pull rope 22 can be exported from the outlets 442 on the corresponding side when it is wound in two opposite directions.

[0137] In some embodiments, the outlet portion 442 may be a hole formed on the connecting plate 44; in other embodiments, the outlet portion 442 may also be a notch formed at the edge of the connecting plate 44.

[0138] In some embodiments, such as Figure 3 and Figure 24 As shown, the pull rope winding assembly 2 also includes multiple limiting members 25. These limiting members 25 extend axially along the winding drum 24 and are distributed circumferentially around it. A winding space is formed between the limiting members 25 and the winding drum 24, and this winding space is configured to allow only a single layer of pull rope 22 to be wound onto the winding drum 24. The limiting members 25 prevent the pull rope 22 from stacking or shifting during winding, ensuring that the pull rope 22 is wound onto the winding drum 24 in a single layer. The number of limiting members 25 can be selected according to actual needs.

[0139] Each limiting member 25 is rotatably mounted at both ends on the first side plate 41 and the fixed seat 45 opposite to the first side plate 41, or on the second side plate 42 and the fixed seat 45 opposite to the second side plate 42. During the rotation of the rope drum 24, the limiting member 25 rubs against the pull rope 22 on the rope drum 24. Under the action of friction, the limiting member 25 will rotate, so that there is rolling friction between the limiting member 25 and the pull rope 22. While playing a limiting role, it can also reduce the friction force and avoid hindering the rotation of the rope drum 24.

[0140] In some embodiments, such as Figure 32 and Figure 33 As shown, multiple rope-passing holes 244 are provided near the outer periphery of the end face of the rope winding cylinder 24 used to fix the end of the pull rope 22. The multiple rope-passing holes 244 are evenly distributed along the circumference of the end face. The end of the pull rope 22 passes through the multiple rope-passing holes 244 in sequence and is knotted at the end, thereby fixing the end of the pull rope 22 to the rope winding cylinder 24. The design of multiple rope-passing holes 244 makes the force exerted by the end of the pull rope 22 on the rope winding cylinder 24 evenly distributed, preventing stress concentration at the fixing position due to single-point force, which could lead to damage to the fixing position.

[0141] This application also provides a fitness device including a resistance transmission device as described in any of the above embodiments. By setting up the resistance transmission device and equipping it with two sets of cable retraction components 2, allowing the two sets of cable retraction components 2 to rotate at the same speed or differential speed, a dual-axis output effect is achieved. The two output ends are respectively used for training the trainee's two arms, meeting the needs of differentiated training and improving the targeting and flexibility of the training. 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. Similar or identical parts between embodiments can be referred to interchangeably.

[0142] 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; Two sets of pull cord retraction and release assemblies, each set of the pull cord retraction and release assembly includes a rotating shaft, the rotation of the rotating shaft is used to wind and store the pull cord or to release the pull cord outward; the two rotating shafts of the two sets of pull cord retraction and release assemblies are coaxially arranged, and there is a gap between the opposite ends; A differential is located between the opposite ends of the two rotating shafts, the differential is drive-connected to the output shaft of the drive source, and is configured to transmit torque to the two rotating shafts and allow the two rotating shafts to rotate at the same speed or at a different speed.

2. The resistance transmission device according to claim 1, characterized in that, The differential includes: A drive gear is connected to the output shaft of the drive source and is driven to rotate. The driven gear meshes with the driving gear and is used to receive the power output of the driving gear. The shaft of the driven gear is coaxially arranged with the two rotating shafts. Two output gears are respectively connected to the opposite ends of the two rotating shafts and rotate synchronously with the corresponding rotating shafts; The planetary gear is capable of rotating around its own axis. The planetary gear is located between the two output gears and meshes with the two output gears respectively. The planetary gear is connected to the driven gear and rotates synchronously with the driven gear.

3. The resistance transmission device according to claim 1 or 2, characterized in that, It also includes a locking component configured to restrict rotation of either or both of the two rotation axes; The resistance transmission device includes at least the following two states: both of the rotating shafts are unrestricted and rotatable, and one of the rotating shafts is restricted in its rotation while the other rotating shaft is rotatable.

4. The resistance transmission device according to claim 3, characterized in that, The locking component includes: Two locking gears are respectively connected to the two rotating shafts for synchronous rotation; Two locking elements are respectively positioned to correspond to the two locking gears and are located close to the tooth surface of the corresponding locking gears; The drive element is configured to selectively drive either of the two locking elements to move toward the corresponding locking gear and insert into the tooth groove of the locking gear to restrict the rotation of the locking gear.

5. The resistance transmission device according to claim 4, characterized in that, The two locking members are located on the same side of the two locking gears, and the two ends of each locking member in the axial direction are a first end and a second end, respectively, with the first end close to the locking gear; the locking members are arranged opposite to the tooth surface of the locking gear in the axial direction. The driving component includes a rotating seat, which is disposed near the second ends of the two locking components, and the rotation plane of the rotating seat is perpendicular to the axial direction of the locking components; the rotating seat has grooves corresponding to the two locking components, and the second ends of the locking components are in contact with the bottom of the grooves; The point on the outer periphery of the locking gear that is close to the locking member and located on the axial direction of the locking member is the locking critical point, and the plane perpendicular to the axial direction of the locking member where the locking critical point is located is the locking critical surface. The bottom of the groove includes a first surface and a second surface; The distance between the first surface and the locking critical surface is greater than the axial length of the locking member; When the second end of the locking member contacts the first surface, the first end of the locking member does not exceed the locking critical point and therefore does not insert into the tooth groove; The distance between the second surface and the locking critical surface is less than the axial length of the locking member; or, in a direction away from the first surface, the distance between the second surface and the locking critical surface gradually decreases to less than the axial length of the locking member; when the second end of the locking member contacts the second surface and the first end exceeds the locking critical point, the locking member is inserted into the tooth groove to restrict the rotation of the locking gear.

6. The resistance transmission device according to claim 5, characterized in that, It also includes mounting brackets; The mounting bracket includes a first side plate and a second side plate arranged opposite to each other, and a connecting plate connecting the first side plate and the second side plate; the two ends of the two rotating shafts that are far apart from each other are respectively mounted on the first side plate and the second side plate; The rotating seat is rotatably mounted on the outer surface of the connecting plate; the connecting plate has openings corresponding to the two locking members, and the first ends of the two locking members pass through the openings to engage with the locking gear.

7. The resistance transmission device according to claim 6, characterized in that, It also includes two fixing seats, which are disposed between the first side plate and the second side plate and are mounted on the inner surface of the connecting plate; The opposite ends of the two rotating shafts are respectively supported by the two fixed seats, and the two locking gears are respectively disposed close to the two fixed seats; Each of the fixed seats is equipped with two support members, which are spaced apart axially from the locking member. Each support member has a through hole for the locking member to pass through. The locking member passes through the two support members and its two ends extend from the two sides of the two support members respectively. An elastic member is provided between the two support members. One end of the elastic member abuts against one of the support members, and the other end is connected to the locking member. The elastic member is configured to keep the second end of the locking member pressed against the bottom of the groove.

8. The resistance transmission device according to claim 4, characterized in that, The two locking members are located on the same side of the two locking gears, and the two ends of each locking member in the axial direction are a first end and a second end, respectively, with the first end close to the locking gear; The driving component includes a sliding seat, the sliding direction of which is the same as the tooth groove extension direction of the locking gear; The two locking members are respectively installed at both ends of the sliding seat in the sliding direction, and the distance between the two locking members is greater than the distance between the two locking gears. The first end of the locking member falls into the tooth groove along the projection of the sliding direction. By sliding the sliding seat, one of the locking members moves closer to the corresponding locking gear and inserts into the tooth groove of the locking gear, thereby restricting the rotation of the locking gear.

9. The resistance transmission device according to claim 8, characterized in that, It also includes a mounting bracket and two mounting bases; The mounting bracket includes a first side plate and a second side plate arranged opposite to each other, and a connecting plate connecting the first side plate and the second side plate; the two ends of the two rotating shafts that are far apart from each other are respectively mounted on the first side plate and the second side plate; The sliding seat is slidably mounted on the outer surface of the connecting plate; the connecting plate has an opening corresponding to the sliding stroke of the two locking members, and the first ends of the two locking members pass through the opening to engage with the locking gear; The two fixing seats are disposed between the first side plate and the second side plate, and are mounted on the inner surface of the connecting plate; the opposite ends of the two rotating shafts are respectively supported by the fixing seats, and the two locking gears are respectively disposed close to the two fixing seats; An elastic element is provided between the fixed base and the corresponding locking element, and the elastic element is in a compressed state; a magnetic element is installed on the sliding base, and the magnetic element is located on the side of the locking element facing the fixed base. The magnetic element is located in the opening and attracts the side wall of the opening opposite to the magnetic element through magnetic action.

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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