External magnetic control device

Abstract

This utility model discloses an external magnetic control device, which includes a swing arm, a magnet, a housing, and a drive unit. The magnet is disposed on the bottom side of the swing arm. The housing includes a bottom shell and a top cover, which are installed together to form a housing space and a bottom opening communicating with the housing space. The opposite sides of the pivot end of the swing arm are rotatably mounted to the bottom shell and the top cover, respectively. The top cover has a wheel hole communicating with the housing space of the housing and the external environment. The drive unit includes a drive wheel and a connecting rod. The drive wheel is located in the housing space of the housing. One side of the drive wheel is rotatably mounted to the bottom shell, and the other side of the drive wheel is rotatably mounted to the top cover by extending into the wheel hole of the top cover. One end of the connecting rod is drivably mounted to the drive wheel on the outside of the top cover, and the other end is rotatably mounted to the driven end of the swing arm.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment technology, and in particular to an external magnetic control device. Background Technology

[0002] In recent years, with the increasing awareness of health, fitness equipment such as exercise bikes have become popular. For example, in Chinese utility model patent application CN1157997A, the inventor disclosed an integrated external magnetic control device, which includes a magnetic control unit. The magnetic control unit further includes a housing, a magnetic control body, and a driver. The magnetic control body has a magnetic control pivot end, a magnetic control free end corresponding to the magnetic control pivot end, and a magnetic control space formed at the magnetic control free end. The magnetic control pivot end of the magnetic control body is rotatably mounted to the housing. The magnetic control space is a magnetic field environment. A portion of the flywheel is allowed to extend into the magnetic control space. When the flywheel is driven to rotate in the magnetic control space of the magnetic control body, the flywheel can cut the magnetic field lines of the magnetic control body to obtain resistance, thereby giving the flywheel a load. The distance between the magnetic control body and the flywheel can be adjusted by driving the magnetic control free end of the magnetic control body to rotate the magnetic control pivot end of the magnetic control body relative to the housing, thereby adjusting the amount of magnetic field lines that the flywheel can cut and thus adjusting the resistance of the flywheel. The housing includes a first housing and a second housing, and the housing has a housing space and a bottom channel. The first housing and the second housing are mounted to each other in such a way that the housing space and the bottom channel communicating with the housing space are formed between the first housing and the second housing. The opposite sides of the end of the magnetic control extension of the magnetic control body that forms the magnetic control pivot end of the magnetic control body are rotatably mounted to the first housing and the second housing in such a way that the magnetic control body is located in the housing space of the housing and the magnetic control space of the magnetic control body faces the bottom channel of the housing. A portion of the flywheel can extend through the bottom channel of the housing to and be held in the magnetic control space of the magnetic control body. The driver includes a drive motor, a set of drive gears, a transmission element, and a transmission arm. The drive motor is fixedly mounted on the housing and has an output shaft that outputs the driving force provided by the drive motor through rotation. The set of drive gears is rotatably mounted on the housing, and one of the drive gears is drivably connected to the output shaft of the drive motor. The transmission element is rotatably mounted on the housing and has a toothed portion and a swing arm portion, located on opposite sides of the transmission element. The toothed portion of the transmission element is drivably connected to another drive gear in the set of drive gears. The opposite ends of the transmission arm are rotatably connected to the swing arm portion of the transmission element and the magnetic extension of the magnetic control body, respectively.When the drive motor outputs power by rotating its output shaft, the drive motor can drive the transmission element to rotate relative to the housing through a set of drive gears, allowing the swing arm portion of the transmission element to swing relative to the housing. At this time, the swing arm portion of the transmission element can drive the magnetic control body to swing relative to the housing space of the housing through the transmission arm, thereby adjusting the distance between the magnetic control body and the flywheel, so as to adjust the amount of magnetic field lines that the flywheel can cut by the magnetic control body and thus adjust the resistance of the flywheel.

[0003] The existing integrated external magnetic control device has the following drawback: since the transmission element has a meshing part on one side and a swing arm part on the other side, the extension length of the meshing part has a limit. When the integrated internal magnetic control device malfunctions (for example, malfunction caused by software defects), the driving teeth of the drive gear and the driven teeth of the meshing part of the transmission element are prone to disengagement. Once the two disengage, it will inevitably lead to transmission failure. To prevent the drive teeth of the drive gear from disengaging from the driven teeth of the meshing part of the transmission element, a limiting mechanism needs to be provided on the housing to limit the maximum rotation angle of the transmission element. This ensures that when the drive motor drives the transmission element to rotate to its maximum rotation angle via the drive gear, the transmission element will stop rotating even if the drive motor continues to output power. While this solves the problem of the drive teeth of the drive gear easily disengaging from the driven teeth of the meshing part of the transmission element, it also introduces new problems. For example, the drive motor may stall and burn out, or the drive teeth of the drive gear or the driven teeth of the meshing part of the transmission element may break. Whether the drive motor burns out or the drive teeth of the drive gear or the driven teeth of the meshing part of the transmission element break, the integrated external magnetic control device will malfunction and become unusable. Utility Model Content

[0004] One objective of this invention is to provide an external magnetic control device, wherein even if the external magnetic control device malfunctions, there will be no power transmission failure between the various parts of the external magnetic control device, nor will there be any damage to the various parts of the device.

[0005] One objective of this invention is to provide an external magnetic control device, wherein the drive wheel of the drive unit of the external magnetic control device is allowed to rotate around its own central axis, thereby preventing power transmission failure between the various parts of the external magnetic control device and preventing damage to the various parts of the structure.

[0006] According to one aspect of the present invention, the present invention provides an external magnetic control device, comprising: Swing arm; A magnet, wherein the magnet is disposed on the underside of the swing arm; A housing, wherein the housing includes a bottom shell and a top cover, the bottom shell and the top cover being mounted to each other, the housing forming a housing space between the bottom shell and the top cover and a bottom opening communicating with the housing space, opposite sides of the pivot end of a swing arm being rotatably mounted to the bottom shell and the top cover respectively, the swing arm being capable of swinging at the bottom opening of the housing, the top cover having a wheel hole communicating with the housing space of the housing and the external environment; and A drive unit, wherein the drive unit includes a drive wheel and a connecting rod, the drive wheel is located in the housing space of the housing, one side of the drive wheel is rotatably mounted to the bottom shell, and the other side of the drive wheel is rotatably mounted to the top cover by extending into the wheel hole of the top cover, one end of the connecting rod is drivably mounted to the drive wheel on the outside of the top cover, and the other end is rotatably mounted to the driven end of the swing arm.

[0007] According to one embodiment of the present invention, the top cover has a rod hole that connects the housing space of the outer shell to the external environment, and one end of the connecting rod extends through the rod hole of the top cover into the housing space of the outer shell, so that this end of the connecting rod is rotatably mounted in the housing space of the outer shell to the driven end of the swing arm.

[0008] According to one embodiment of the present invention, the top cover has a groove, the wheel hole of the top cover extends from the bottom of the groove to the housing space of the outer shell, the rod hole of the top cover extends from the side of the groove to the housing space of the outer shell, wherein one end of the connecting rod is located in the groove of the top cover.

[0009] According to one embodiment of the present invention, the drive wheel has a shaft offset from the central axis of the drive wheel, and one end of the connecting rod has a shaft hole. The shaft of the drive wheel is rotatably inserted into the shaft hole of the connecting rod, so that this end of the connecting rod is drivably mounted to the drive wheel.

[0010] According to one embodiment of the present invention, the drive wheel has a shaft hole offset from the central axis of the drive wheel, and one end of the connecting rod has a pivot. The pivot of the connecting rod is rotatably inserted into the shaft hole of the drive wheel, so that this end of the connecting rod is drivably mounted on the drive wheel.

[0011] According to one embodiment of the present invention, one side of the drive wheel has a cylindrical platform and a blocking ring. The blocking ring protrudes from the peripheral wall of the cylindrical platform, and the cylindrical platform extends into the wheel hole of the top cover. The outer diameter of the cylindrical platform is slightly smaller than the inner diameter of the wheel hole of the top cover, and the outer diameter of the blocking ring is larger than the inner diameter of the wheel hole of the top cover.

[0012] According to one embodiment of the present invention, the drive wheel has an assembly hole on one side, the bottom shell has an assembly post, the assembly post extends into the assembly hole of the drive wheel, wherein the outer diameter of the assembly post is slightly smaller than the inner diameter of the assembly hole of the drive wheel.

[0013] According to one embodiment of the present invention, the bottom shell has a bottom shell perforation, the external magnetic control device includes a potentiometer, the fixed part of the potentiometer is installed on the bottom shell, the drive wheel has a mounting shaft, and the end of the mounting shaft is inserted into the movable part of the potentiometer after passing through the bottom shell perforation of the bottom shell.

[0014] According to one embodiment of the present invention, the drive unit includes a drive motor, a worm gear, and a set of transmission gears. The drive motor is installed in the housing space of the outer casing, the worm gear is installed on the rotor of the drive motor, and the opposite sides of the set of transmission gears are rotatably installed on the bottom shell and the top cover, respectively, so that the set of transmission gears is located in the housing space of the outer casing. Adjacent transmission gears mesh with each other, with one outermost transmission gear meshing with the worm gear and the other outermost transmission gear meshing with the drive wheel.

[0015] According to one embodiment of the present invention, the drive wheel has an annular clearance groove for avoiding the transmission gear. Attached Figure Description

[0016] Figure 1 This is a perspective view of an external magnetic control device according to a preferred embodiment of the present invention.

[0017] Figure 2 This is a perspective view of the external magnetic control device according to the above-described preferred embodiment of the present invention.

[0018] Figure 3 This is a partial cross-sectional schematic diagram of the external magnetic control device according to the above-described preferred embodiment of the present invention.

[0019] Figure 4 yes Figure 3 A magnified view of a local location.

[0020] Figure 5This is an exploded view of the external magnetar control device according to the above-described preferred embodiment of the present invention.

[0021] Figure 6 This is an exploded view of the external magnetic control device according to the above-described preferred embodiment of the present invention.

[0022] Figure 7 This is a partial perspective view of the external magnetic control device according to the above-described preferred embodiment of the present invention.

[0023] Figure 8 This is a partial schematic diagram of the external magnetic control device according to the above-described preferred embodiment of the present invention when a swing arm swings to a position.

[0024] Figure 9 This is a partial schematic diagram of the external magnetic control device according to the above-described preferred embodiment of the present invention when the swing arm swings to another position.

[0025] Figure 10 This is a partial schematic diagram of the external magnetic control device according to the above-described preferred embodiment of the present invention when the swing arm swings to another position.

[0026] Figure 11 This is a perspective view of a partial position of a modified example of the external magnetic control device according to the above-described preferred embodiment of the present invention.

[0027] Figure 12 This is a perspective view of a partial position of the modified example of the external magnetic control device according to the above-described preferred embodiment of the present invention.

[0028] Figure 13 This is a partial schematic diagram of the swing arm swinging to a position in a modified example of the external magnetic control device according to the above-described preferred embodiment of the present invention, based on the preferred embodiment of the present invention. Detailed Implementation

[0029] Before describing any embodiment of this invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof herein is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0030] Furthermore, firstly, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation on this utility model. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0031] Refer to the accompanying drawings of the specification of this utility model. Figures 1 to 10 An external magnetic control device according to a preferred embodiment of the present invention will be disclosed and described in the following description, wherein the external magnetic control device includes a housing 10, a swing arm 20, a magnet 30 and a drive unit 40.

[0032] Specifically, the outer casing 10 includes a bottom shell 11 and a top cover 12, and the outer casing 10 has a casing space 13 and a bottom opening 14, wherein the bottom shell 11 and the top cover 12 are mounted to each other to form the casing space 13 and the bottom opening 14 of the outer casing 10 between the bottom shell 11 and the top cover 12, and the bottom opening 14 communicates with the casing space 13. (See attached...) Figures 1 to 10 In this specific example of the external magnetic control device of the present invention shown, a set of screws 100 can be used to mount the bottom shell 11 and the top cover 12.

[0033] The swing arm 20 has a pivoting end 21 and a driven end 22 opposite to each other. The opposite sides of the pivoting end 21 of the swing arm 20 are rotatably mounted to the bottom shell 11 and the top cover 12, respectively, and the swing arm 20 is configured to swing at the bottom opening 14 of the outer shell 10. (See attached...) Figures 1 to 10 In this specific example of the external magnetic control device of the present invention shown, the swing arm 20 extends curvedly between the pivot end 21 and the driven end 22 so that the shape of the swing arm 20 matches the shape of the flywheel 200 of the fitness equipment.

[0034] The magnet 30 is disposed on the bottom side of the swing arm 20. When the driven end 22 of the swing arm 20 is pulled up or pressed down to allow the swing arm 20 to swing relative to the housing 10, the swing arm 20 drives the magnet 30 to swing synchronously. Specifically, when the driven end 22 of the swing arm 20 is pulled up, the swing arm 20 drives the magnet 30 to swing upward, so that the swing arm 20 and the magnet 30 move away from the flywheel 200. When the driven end 22 of the swing arm 20 is pressed down, the swing arm 20 drives the magnet 30 to swing downward, so that the swing arm 20 and the magnet 30 move closer to the flywheel 200. (See attached...) Figures 1 to 10 In this specific example of the external magnetic control device of the present invention shown, there are multiple magnets 30 arranged side by side along the length of the swing arm 20. It is understood that adhesive can be used to bond the magnets 30 to the bottom side of the swing arm 20.

[0035] The drive unit 40 includes a drive wheel 41, with opposite sides of the drive wheel 41 rotatably mounted to the bottom shell 11 and the top cover 12, respectively, so that the drive wheel 41 can rotate around its own central axis within the housing space 13 of the outer shell 10, wherein the rotation angle of the drive wheel 41 can exceed 360°. Specifically, the bottom shell 11 has a mounting post 111, and one side of the drive wheel 41 has a mounting hole 411. The mounting post 111 of the bottom shell 11 extends into the mounting hole 411 of the drive wheel 41, and the outer diameter of the mounting post 111 of the bottom shell 11 is slightly smaller than the inner diameter of the mounting hole 411 of the drive wheel 41, so that side of the drive wheel 41 is rotatably mounted to the bottom shell 11. The top cover 12 has a wheel hole 121 that connects the housing space 13 of the outer casing 10 to the external environment. The other side of the drive wheel 41 extends into the wheel hole 121 of the top cover 12, so that side of the drive wheel 41 is rotatably mounted to the top cover 12. With this structure, the drive wheel 41 can rotate about its own central axis within the housing space 13 of the outer casing 10.

[0036] Preferably, one side of the drive wheel 41 has a cylindrical platform 412 and a retaining ring 413. The retaining ring 413 protrudes from the peripheral wall of the cylindrical platform 412. The cylindrical platform 412 of the drive wheel 41 extends into the wheel hole 121 of the top cover 12. The outer diameter of the cylindrical platform 412 of the drive wheel 41 is slightly smaller than the inner diameter of the wheel hole 121 of the top cover 12, and the outer diameter of the retaining ring 413 of the drive wheel 41 is larger than the inner diameter of the wheel hole 121 of the top cover 12. In this way, this side of the drive wheel 41 can be reliably installed in the wheel hole 121 of the top cover 12.

[0037] The drive unit 40 further includes a connecting rod 42. One end of the connecting rod 42 is drivably mounted to the drive wheel 41 on the outside of the top cover 12, i.e., this end of the connecting rod 42 is not located in the housing space 13 of the outer casing 10. The other end of the connecting rod 42 is rotatably mounted to the driven end 22 of the swing arm 20. When the drive wheel 41 rotates about its own central axis, the drive wheel 41 can pull up or press down the driven end 22 of the swing arm 20 through the connecting rod 42, causing the swing arm 20 and the magnet 30 to swing at the bottom opening 14 of the outer casing 10, thereby adjusting the distance between the swing arm 20 and the magnet 30 and the flywheel 200.

[0038] Unlike existing technologies, in the external magnetic control device of this invention, the drive wheel 41 can rotate around its own central axis within the housing space 13 of the outer shell 10, and the rotation angle of the drive wheel 41 can exceed 360°. In one motion cycle (i.e., the drive wheel 41 rotates 360°), the connecting rod 42 first pulls up the driven end 22 of the swing arm 20, and then presses down the driven end 22 of the swing arm 20, or the connecting rod 42 first presses down the driven end 22 of the swing arm 20, and then pulls up the driven end 22 of the swing arm 20. In this way, the various parts of the external magnetic control device of this invention will not experience power transmission failure, nor will they experience damage to various parts of the structure due to the setting of the limiting mechanism. This is crucial for improving the reliability of the external magnetic control device.

[0039] Preferably, the top cover 12 has a rod hole 122 that connects the housing space 13 of the outer casing 10 to the external environment, and one end of the connecting rod 42 extends through the rod hole 122 of the top cover 12 to the housing space 13 of the outer casing 10, so that this end of the connecting rod 42 is rotatably mounted in the housing space 13 of the outer casing 10 to the driven end 22 of the swing arm 20.

[0040] That is, the connecting rod 42 has an outer end 421 and an inner end 422 corresponding to the outer end 421. The outer end 421 of the connecting rod 42 is drivably mounted to the drive wheel 41 on the outside of the top cover 12. The inner end 422 of the connecting rod 42 extends to the housing space 13 of the outer casing 10 after passing through the rod hole 122 of the top cover 12 and is rotatably mounted to the driven end 22 of the swing arm 20.

[0041] More preferably, the top cover 12 has a groove 123, the wheel hole 121 of the top cover 12 extends from the bottom of the groove 123 to the housing space 13 of the outer casing 10, and the rod hole 122 of the top cover 12 extends from the side of the groove 123 to the housing space 13 of the outer casing 10. By providing the groove 123 in the top cover 12, the external magnetic control device can prevent the outer end 421 of the connecting rod 42 from protruding from the top cover 12, thereby preventing the connecting rod 42 from being collided and ensuring the reliability of the external magnetic control device.

[0042] Reference Appendix Figures 5 to 7 The drive unit 40 further includes a drive motor 43, a worm gear 44, and a set of transmission gears 45. The drive motor 43 is mounted in the housing space 13 of the housing 10. For example, the screw 100 can be used to lock the drive motor 43 to the bottom shell 11, and the bottom shell 11 and the top cover 12 respectively clamp the drive motor 43 on opposite sides, so that the drive motor 43 is reliably mounted in the housing space 13 of the housing 10. The worm gear 44 is mounted on the rotor of the drive motor 43, and the set of transmission gears 45... The opposite sides of each gear 45 are rotatably mounted to the bottom shell 11 and the top cover 12, such that a set of transmission gears 45 are located in the housing space 13 of the outer shell 10. For example, the opposite ends of the axle of each transmission gear 45 are rotatably mounted to the bottom shell 11 and the top cover, such that the opposite sides of each transmission gear 45 are rotatably mounted to the bottom shell 11 and the top cover, wherein two adjacent transmission gears 45 mesh with each other, one outermost transmission gear 45 meshes with the worm gear 44, and the other outermost transmission gear 45 meshes with the drive wheel 41.

[0043] When the drive motor 43 outputs power by rotating its rotor in one direction, the power is transmitted to the drive wheel 41 by the worm gear 44 and a set of transmission gears 45, driving the drive wheel 41 to rotate around its central axis within the housing space 13 of the outer casing 10. During rotation, the drive wheel 41 pulls up or down the driven end 22 of the swing arm 20 via the connecting rod 42 to adjust the distance between the swing arm 20, the magnet 30, and the flywheel 200. It can be understood that the drive motor 43 can also output power by rotating its rotor in the other direction. In this process, the power is transmitted to the drive wheel 41 by the worm gear 44 and a set of transmission gears 45, driving the drive wheel 41 to perform circular motion within the housing space 13 of the outer casing 10. During rotation, the drive wheel 41 pulls up or down the driven end 22 of the swing arm 20 via the connecting rod 42 to adjust the distance between the swing arm 20, the magnet 30, and the flywheel 200. Preferably, refer to the appendix Figure 3 and Figure 4 The drive wheel 41 has a clearance groove 414 for avoiding the transmission gear 45 that meshes with it.

[0044] It is understood that in the external magnetic control device of this utility model, the drive motor 43 is allowed to drive the drive wheel 41 to rotate around its own central axis in the housing space 13 of the outer casing 10 through the worm gear 44 and a set of transmission gears 45, and the rotation angle of the drive wheel 41 can exceed 360°. During this process, the drive wheel 41, the worm gear 44 and the transmission gears 45 will not experience the problem of the drive teeth and the driven teeth disengaging, nor will the drive teeth and the driven teeth break. The drive motor 43 will not experience the problem of stalling. Therefore, there will be no problem of power transmission failure between the various parts of the external magnetic control device of this utility model, and there will be no problem of easy damage to the various parts of the structure due to the setting of the limiting mechanism. This is crucial for improving the reliability of the external magnetic control device.

[0045] Continue to refer to the appendix Figures 1 to 10In this specific example of the external magnetic control device of this utility model, the drive wheel 41 has a rotating shaft 415, which is offset from the central axis of the drive wheel 41. The outer end 421 of the connecting rod 42 has a shaft hole 423. The rotating shaft 415 of the drive wheel 41 is rotatably inserted into the shaft hole 423 of the connecting rod 42, so that the outer end 421 of the connecting rod 42 is drivably mounted on the drive wheel 41. When the drive motor 43 drives the drive wheel 41 to rotate around its own central axis through the worm gear 44 and a set of transmission gears 45, the rotating shaft 415 of the drive wheel 41 makes a circular motion. During this process, the drive wheel 41 pulls up or presses down the driven end 22 of the swing arm 20 through the connecting rod 42.

[0046] Optionally, in other examples of the external magnetic control device of this utility model, the rotating shaft 415 can be provided at the outer end 421 of the connecting rod 42. Correspondingly, the shaft hole 423 is provided in the drive wheel 41 and is offset from the central axis of the drive wheel 41. The rotating shaft 415 of the connecting rod 42 is inserted into the shaft hole 423 of the drive wheel 41. Thus, the outer end 421 of the connecting rod 42 is drivably mounted on the drive wheel 41. When the drive motor 43 drives the drive wheel 41 to rotate around its own central axis through the worm gear 44 and a set of transmission gears 45, the shaft hole 423 of the drive wheel 41 makes a circular motion. During this process, the drive wheel 41 pulls up or presses down the driven end 22 of the swing arm 20 through the connecting rod 42.

[0047] Continue to refer to the appendix Figure 3 and Figure 4The bottom shell 11 has a bottom shell perforation 112, which connects the shell space 13 of the outer shell 10 to the external environment. The external magnetic control device includes a potentiometer 50, the fixed portion of which is mounted on the bottom shell 11. The drive wheel 41 has a mounting shaft 416, the end of which passes through the bottom shell perforation 112 of the bottom shell 11 and is inserted into the movable portion of the potentiometer 50. The drive motor 43 drives the drive wheel 41 around its centerline via the worm gear 44 and a set of transmission gears 45. When the axis rotates, on the one hand, the drive wheel 41 pulls up or presses down the driven end 22 of the swing arm 20 through the connecting rod 42, causing the swing arm 20 and the magnet 30 to swing relative to the outer shell 10. On the other hand, the drive wheel 41 drives the movable part of the potentiometer 50 to rotate, thereby changing the resistance value of the potentiometer 50. The amount of change in the resistance value of the potentiometer 50 corresponds one-to-one with the swing position of the swing arm 20 and the magnet 30. Thus, the swing position of the swing arm 20 and the magnet 30 can be determined by detecting the amount of change in the resistance value of the potentiometer 50.

[0048] Reference Appendix Figure 3 , Figures 5 to 7 The external magnetic control device further includes a circuit board 60, which can be locked to the bottom shell 11 by the screw 100, and the circuit board 60 is located in the housing space 13 of the outer shell 10, wherein the drive motor 43 and the potentiometer 50 are respectively connected to the circuit board 60.

[0049] Appendix Figures 11 to 13 A modified example of the external magnetron device is shown, with attachment Figures 1 to 10 Unlike the external magnetic control device shown, the attached... Figures 11 to 13 In this specific example of the external magnetic control device shown, the external magnetic control device further includes a sensor 70, which is attached to the connecting rod 42 for detecting the amount of deformation of the connecting rod 42. Specifically, when a user exercises on the fitness equipment, the flywheel 200 needs to be driven to rotate. During the rotation, the flywheel 200 cuts the magnetic field lines of the magnet 30 of the external magnetic control device to obtain a load. At the same time, the swing arm 20 and the magnet 30 receive a downward pulling force, causing the swing arm 20 and the magnet 30 to tend to move towards the flywheel 200. This tendency will cause the connecting rod 42 to deform. By attaching the sensor 70 to the connecting rod 42, the amount of deformation of the connecting rod 42 can be detected. Therefore, based on the correspondence between the amount of deformation of the connecting rod 42 and the actual power, the actual power of the user exercising on the fitness equipment can be accurately detected.

[0050] It is understood that fitness equipment typically has multiple power levels, each corresponding to a preset target power. Users can select a suitable power level according to their fitness needs. After a power level is selected, there will be a difference between the user's actual power during exercise and the target power corresponding to that power level, which will affect the user's fitness results. In the external magnetic control device of this utility model, the user's actual power at that power level can be detected based on the deformation of the connecting rod 42. Thus, the difference between the user's actual power during exercise and the target power corresponding to that power level is obtained. Subsequently, by adjusting the distance between the swing arm 20 and the magnet 30 and the flywheel 200, the user's actual power during exercise can be adjusted to make the actual power consistent with the target power, thereby ensuring the fitness effect.

[0051] In the appendix Figures 11 to 13 In this specific example of the fitness equipment of the present invention, the connecting rod 42 extends in an arc shape, and the sensor 70 is attached to the convex or concave side of the connecting rod 42. Because the connecting rod 42 is arc-shaped, the deformation of the connecting rod 42 can be increased when the user exercises with the equipment. This increases the resistance change of the sensor 70, making it easier to detect the deformation of the connecting rod 42 based on the resistance change of the sensor 70. Preferably, one sensor 70 is attached to each of the convex and concave sides of the connecting rod 42. When the connecting rod 42 deforms, both sensors 70 can detect the deformation. While the resistance values ​​of the two sensors 70 may differ due to environmental factors, the resistance change of both sensors 70 is the same. Therefore, the cooperation of the two sensors 70 can effectively eliminate the interference of environmental factors on the detection results, accurately obtaining the actual power exerted by the user during exercise.

[0052] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. An external magnetic control device, characterized in that, include: Swing arm; A magnet, wherein the magnet is disposed on the underside of the swing arm; An outer casing, wherein the outer casing includes a bottom shell and a top cover, the bottom shell and the top cover being mounted to each other, the outer casing forming a casing space and a bottom opening communicating with the casing space, the pivot ends of a swing arm being rotatably mounted on opposite sides of the bottom shell and the top cover respectively, the swing arm being able to swing at the bottom opening of the outer casing, and the top cover having wheel holes communicating with the casing space of the outer casing and the external environment; as well as A drive unit, wherein the drive unit includes a drive wheel and a connecting rod, the drive wheel is located in the housing space of the housing, one side of the drive wheel is rotatably mounted to the bottom shell, and the other side of the drive wheel is rotatably mounted to the top cover by extending into the wheel hole of the top cover, one end of the connecting rod is drivably mounted to the drive wheel on the outside of the top cover, and the other end is rotatably mounted to the driven end of the swing arm.

2. The external magnetic control device according to claim 1, wherein the top cover has a rod hole communicating with the housing space of the outer casing and the external environment, and one end of the connecting rod extends through the rod hole of the top cover into the housing space of the outer casing, such that this end of the connecting rod is rotatably mounted in the housing space of the outer casing to the driven end of the swing arm.

3. The external magnetic control device according to claim 2, wherein the top cover has a groove, the wheel hole of the top cover extends from the bottom of the groove to the housing space of the outer casing, the rod hole of the top cover extends from the side of the groove to the housing space of the outer casing, wherein one end of the connecting rod is located in the groove of the top cover.

4. The external magnetic control device according to claim 3, wherein the drive wheel has a shaft offset from the central axis of the drive wheel, one end of the connecting rod has a shaft hole, and the shaft of the drive wheel is rotatably inserted into the shaft hole of the connecting rod so that this end of the connecting rod is drivably mounted to the drive wheel.

5. The external magnetic control device according to claim 3, wherein the drive wheel has a shaft hole offset from the central axis of the drive wheel, one end of the connecting rod has a pivot, and the pivot of the connecting rod is rotatably inserted into the shaft hole of the drive wheel so that this end of the connecting rod is drivably mounted to the drive wheel.

6. The external magnetic control device according to any one of claims 1 to 5, wherein one side of the drive wheel has a cylindrical platform and a blocking ring, the blocking ring protruding from the peripheral wall of the cylindrical platform, the cylindrical platform extending into the wheel hole of the top cover, wherein the outer diameter of the cylindrical platform is slightly smaller than the inner diameter of the wheel hole of the top cover, and the outer diameter of the blocking ring is larger than the inner diameter of the wheel hole of the top cover.

7. The external magnetic control device according to claim 6, wherein one side of the drive wheel has a mounting hole, the bottom shell has a mounting post, the mounting post extends into the mounting hole of the drive wheel, wherein the outer diameter of the mounting post is slightly smaller than the inner diameter of the mounting hole of the drive wheel.

8. The external magnetic control device according to any one of claims 1 to 5, wherein the bottom shell has a bottom shell perforation, the external magnetic control device includes a potentiometer, the fixed portion of the potentiometer is mounted on the bottom shell, the drive wheel has a mounting shaft, and the end of the mounting shaft is inserted into the movable portion of the potentiometer after passing through the bottom shell perforation of the bottom shell.

9. The external magnetic control device according to any one of claims 1 to 5, wherein the drive unit includes a drive motor, a worm gear, and a set of transmission gears, the drive motor is mounted in the housing space of the housing, the worm gear is mounted on the rotor of the drive motor, and the opposite sides of the set of transmission gears are rotatably mounted on the bottom shell and the top cover, respectively, so that the set of transmission gears is located in the housing space of the housing, adjacent two transmission gears mesh with each other, one outermost transmission gear meshes with the worm gear, and the other outermost transmission gear meshes with the drive wheel.

10. The external magnetic control device according to claim 9, wherein the drive wheel has an annular clearance groove for avoiding the transmission gear.

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