Resistance adjusting device of sports equipment

Abstract

The invention relates to a resistance adjusting device of sports equipment, which comprises a metal disc capable of being driven to rotate by the movement of a user, a displacement seat capable of displacing according to the control of the user, and at least one magnet arranged on the displacement seat, the magnet can be close to or far away from the rotating axis of the metal disc along an adjusting path along with the displacement of the displacement seat, so that the area of the projection of the magnet on the metal disc along the axial direction of the metal disc is increased or reduced, and the rotating resistance of the metal disc is adjusted; in one embodiment, the cross section of the magnet is in a non-parallelogram shape and is gradually widened from the side close to the rotating axis to the side far away from the rotating axis, so that the magnet can be adjusted in the process that the magnet moves from the end far away from the rotating axis to the end close to the rotating axis along the adjusting path at a constant speed. And the increase rate of the projection area is gradually increased.

Description

Technical Field

[0001] The invention relates to sports equipment, in particular to a resistance adjusting device for sports equipment. Background Art

[0002] Figure 1 A fitness bike 90 in the prior art is shown, more specifically, a so-called "spinning bike" which is very popular recently, which allows users to simulate riding a road bike indoors. When a user pedals and turns a pedal crank set 91 of the fitness bike 90, a metal disc 93 is driven to rotate in situ via a transmission system 92. The metal disc 93 has the function of a flywheel, that is, it can generate sufficient rotational inertia when rotating, so that the pedal crank set 91 linked with it can rotate smoothly and accelerate and decelerate smoothly. In addition, the fitness bike 90 is provided with a resistance adjustment device 94 that can adjust the rotation resistance of the metal disc 93, such as an eddy current brake, so that the user can adjust the effort of pedaling according to needs.

[0003] A typical structure of the eddy current brake type resistance adjustment device 94 is as follows Figure 2 As shown, the exercise bike 90 has a displacement seat 95 that can swing within a predetermined angle range according to the swing axis A1. The user can turn an adjustment handle 96 at the front end of the exercise bike 90 (see Figure 1 ), the position of the displacement seat 95 is controlled by shortening or lengthening a steel cable 97 connected to the displacement seat 95; the displacement amount of the displacement seat 95 is proportional to the displacement amount of the user turning the adjustment handle 96; the displacement seat 95 is provided with two round ingot magnets 98 located on two opposite axial sides of the metal plate 93 (Note: the two magnets 98 overlap when viewed along the axial direction, Figure 2 Only one is marked in the figure); the magnet 98 can move closer to or farther from the axis of the metal disk 93 along an arc-shaped adjustment path T1 as the displacement seat 95 swings, crossing the circular edge 931 of the metal disk 93, so that the area of ​​the magnet 98 projected on the metal disk 93 along the axial direction of the metal disk 93 increases or decreases. The aforementioned projected area can be understood as the actual area of ​​the magnet 98 causing the metal disk 93 to generate an eddy current effect. In simple terms, at the same rotation speed, the resistance of the magnet 98 to the rotation of the metal disk 93 is proportional to the aforementioned projected area.

[0004] See also Figure 2, when the magnet 98 is located at the end of the adjustment path T1 that is farther from the axis of the metal disk (the left end in the figure), as shown by the outer critical position of the imaginary line 98', the circular edge of the magnet 98 and the circular edge 931 of the metal disk 93 are in an external tangent relationship. Because the aforementioned projected area is zero and cannot be smaller, the resistance applied by the magnet 98 to the metal disk 93 is also the minimum value of the adjustable range; Conversely, when the magnet 98 is located at the end of the adjustment path T1 that is closer to the axis of the metal disk (the right end in the figure), as shown by the inner critical position of the imaginary line 98", the circular edge of the magnet 98 and the circular edge 931 of the metal disk 93 are in an inner tangent relationship. Since the aforementioned projection area is equal to the circular cross-sectional area of ​​the magnet 98 and cannot be larger, the resistance applied by the magnet 98 to the metal disk 93 is also the maximum value of the adjustable range. It can be imagined that in the process of the magnet 98 moving from the outer critical position to the inner critical position, the aforementioned projection area will gradually increase from zero to equal to the cross-sectional area of ​​the magnet 98, and the resistance will also gradually increase from the minimum value of the adjustable range to the maximum value. However, under the above-mentioned prior art, when the user controls the position of the magnet 98 on the adjustment path T1 by turning the adjustment handle 96 to adjust the movement resistance, there may be a gap between the expected resistance change and the actual resistance change, and the reasons are as follows:

[0005] Figure 3 The multiple levels of the magnet 98 from the outer critical position to the inner critical position are illustrated in the form of a sequence change, and the magnet position in each level is evenly stepped. Specifically, the state with the minimum resistance is set to Lv.0, and the state with the maximum resistance is set to Lv.10. That is to say, the highest level is 10 levels evenly spaced from the lowest level. Assuming that the magnet position of Lv.10 and Lv.0 (referring to the angular position of the magnet 98 relative to the swing axis A1) differs by 60 degrees, the magnet positions of two adjacent levels shall all differ by 6 degrees. Figure 3 The blackened areas in each section represent the overlapping parts of the magnet 98 and the metal disk 93 in the axial direction. Obviously, every time the magnet 98 moves forward one section, the area of ​​the overlapping part (i.e. the aforementioned projected area) will increase a little more, so that the resistance will be correspondingly increased. However, since the cross-section of the magnet 98 is circular, in the process of its uniform displacement from the outer critical position (Lv.0 position) to the inner critical position (Lv.10 position), the rate of increase of the aforementioned projected area will gradually accelerate in the first half and gradually slow down in the second half. The above phenomenon is combined with Figure 4It is easier to understand: when the magnet 98 is located at the position of Lv.0, no part of the circular cross section of the magnet 98 overlaps with the metal disk 93; when the magnet 98 is located at the position of Lv.1, a small area (a1) of the edge of the circular cross section of the magnet 98 will overlap with the metal disk 93; when the magnet 98 moves from the position of Lv.1 to the position of Lv.2, the part of the magnet cross section overlapping with the metal disk 93 will be expanded by a slightly larger area (a2); in this way, every time the magnet 98 moves forward a unit distance (for example, swinging 6 degrees), the overlapping part will increase a little, and the increased area of ​​each section will be larger than the previous one, for example, a3 is larger than a2, a4 is larger than a3, and so on; however, after about exceeding half of the circular cross section, every time the magnet 98 moves forward a unit distance, the increased area of ​​each section of the overlapping part will be smaller than the previous one, for example, a8 is smaller than a7, a9 is smaller than a8, and finally a10 is smaller than a9.

[0006] Figure 5 The figure is a graph showing the relationship between the area of ​​the overlapped portion and the position of the magnet, wherein the horizontal axis represents the position of the magnet, indicating 10 equal positions corresponding to each stage, and the vertical axis represents the area of ​​the overlapped portion, with the cross-sectional area of ​​the magnet 98 (i.e. the maximum value of the projected area) as 100%, indicating the percentage of the area of ​​the overlapped portion under each stage relative to the maximum value, which also represents the percentage of the resistance applied by the magnet 98 to the metal disk 93 relative to the maximum resistance that can be applied. As shown in the data in the figure, from Lv.0 to Lv.6, the resistance increases by 3.0%, 6.0%, 8.5%, 10.6%, 12.3% and 13.5% of the maximum resistance in sequence for each stage of the magnet, indicating that the rate of resistance increase is gradually accelerating; and from Lv.6 to Lv.10, the resistance increases by 14.0%, 13.5%, 11.7% and 6.9% of the maximum resistance in sequence for each stage of the magnet, indicating that the rate of resistance increase is gradually slowing down. From the curve itself, the slope of the middle part of the line segment is relatively large, while the slope of the bottom and top segments is relatively small, which means that the resistance is relatively sensitive to the change of the magnet position in the middle area of ​​the adjustable range, and relatively slow in the lower and upper areas of the adjustable range. Figure 5 As shown in the proportional relationship, the magnet needs to move forward from the outer critical position to about 32.8% of the total length of the adjustment path T1 in order to increase the resistance from zero to 20% of the maximum resistance; after that, to increase the resistance from 20% of the maximum resistance to 40%, from 40% to 60%, and from 60% to 80%, the magnet only needs to move forward by about 17.0%, 14.7%, and 14.6% of the total length respectively; finally, to increase the resistance from 80% of the maximum resistance to 100%, the magnet needs to move forward by about 21.1% of the total length, and the adjustment efficiency (the ratio of resistance change to displacement distance) becomes low again.

[0007] The above characteristics may cause the user to feel the incoordination between the resistance change and the adjustment action when adjusting the exercise resistance, especially for sports equipment such as flywheels that are often used for high-intensity interval training. Because the user may frequently increase and decrease the exercise resistance during exercise, and the high and low span is quite large, it is easy to feel that for the same adjustment action (for example, turning the adjustment handle 96 to the same angle, or a stage of a staged adjustment), the resistance change obtained at the middle resistance is more obvious, while the resistance change obtained at the low resistance and high resistance is less obvious. Moreover, from the minimum resistance to the maximum resistance, the rate of resistance change in response to the adjustment action becomes faster and faster in the first half and slower and slower in the second half. The operation response is neither a linear relationship nor lacks a unified trend. Most obviously, when using a flywheel for high-intensity interval training, the resistance is usually increased from the middle resistance to the high resistance (e.g., more than 70% or 80% of the maximum resistance) after a proper warm-up, to simulate the situation where one must exert great effort (usually by standing and riding) to pedal when climbing a hill or riding against the wind. However, when the user wants to perform high-intensity exercise and turns the adjustment handle 96 to the end of the adjustable range, the resistance increase rate in the higher range is not as fast as the resistance increase rate in the middle range, so the resistance increase may be lower than the user's expectations and needs. In addition, during the flywheel exercise, when the user wants to slow down or even stop the rotating pedal as quickly as possible, or as a safety measure before getting off the vehicle, the adjustment handle 96 will be turned directly to the end, that is, the resistance reaches the maximum value, making it difficult for the pedal to rotate, and this final stage of increasing resistance is even more inefficient. Summary of the invention

[0008] In view of the above problems, the main purpose of the present invention is to provide a resistance adjustment device for sports equipment, whose operation response has a uniform trend and predictability and provides a better user experience.

[0009] Another object of the present invention is to provide a resistance adjustment device for sports equipment, whose operation response in a higher region of the adjustable resistance range is more in line with the user's expectations and needs of increasing the resistance for high-intensity exercise.

[0010] Another object of the present invention is to provide a resistance adjustment device for sports equipment, which is suitable for use in sports equipment that may need to quickly slow down the inertia of movement during exercise, and has a high operating efficiency when performing the aforementioned slowing down.

[0011] Another object of the present invention is to provide a resistance adjustment device for sports equipment, which is particularly suitable as a resistance adjustment device for a flywheel vehicle.

[0012] To achieve the above-mentioned purpose, the present invention provides a resistance adjustment device for sports equipment, comprising: a frame; a metal plate pivotally mounted on the frame according to a rotation axis, and capable of being rotated by the movement of a user of the sports equipment; the metal plate having a circular edge with the rotation axis as the center; a displacement seat mounted on the frame, and capable of being displaced according to the control of the user; at least one magnet mounted on the displacement seat, capable of crossing the circular edge of the metal plate along an adjustment path to approach or move away from the rotation axis as the displacement seat moves, so that the area of ​​the magnet projected on the metal plate along the axial direction of the metal plate increases or decreases; when the magnet is located at the first end of the adjustment path, the projected area is the minimum value of the adjustable range, and when the magnet is located at the first end of the adjustment path, the projected area is the minimum value of the adjustable range. The projection area is the maximum value of the adjustable range when the magnet is at the second end of the adjustment path; the feature is that the cross section of the magnet on the radial plane of the rotation axis is non-circular, and the outer edge of the magnet cross section includes a first side and a second side opposite to each other, the first side and the second side each having a head end and a tail end, the two head ends are located on the same side and are separated by a convergence distance, the two tail ends are located on the other side and are separated by a divergence distance greater than the convergence distance, and the width of the magnet cross section between the first side and the second side gradually widens from the side where the two head ends are located to the side where the two tail ends are located; when the magnet is located at the first end of the adjustment path, the head ends of the first side and the second side of the magnet cross section are respectively closer to the circular edge of the metal disk than the tail ends.

[0013] In the technical solution of the present invention, the first side and the second side of the magnet cross section are two non-parallel straight lines.

[0014] When the magnet is located at the first end of the adjustment path, when viewed along the axial direction of the metal disk, at least one of the first side and the second side of the magnet cross section intersects the circular edge of the metal disk at one point.

[0015] In the process of the magnet moving from the first end to the second end along the adjustment path, at least the projected area increases from the minimum value by between 5% and 95% of the difference between the maximum value and the minimum value, and when observed along the axial direction of the metal disk, the circular edge of the metal disk keeps passing through the first side and the second side of the magnet cross section at the same time.

[0016] The outer edge of the magnet cross section also includes a short side, which connects the head ends of the first side and the second side; when the magnet is located at the first end of the adjustment path, when observed along the axial direction of the metal disk, the short side of the magnet cross section approaches or overlaps with the circular edge of the metal disk.

[0017] The outer edge of the magnet cross section also includes a long side, which connects the tail ends of the first side and the second side; when the magnet is located at the second end of the adjustment path, when observed along the axial direction of the metal disk, the long side of the magnet cross section approaches or overlaps with the circular edge of the metal disk.

[0018] The displacement seat is pivotally mounted on the frame according to a swing axis parallel to the rotation axis; the relative direction of the first side and the second side of the magnet cross section corresponds to the relative direction of the magnet and the swing axis.

[0019] The first side of the magnet cross section is closer to the swing axis than the second side, and the length of the second side is greater than the length of the first side.

[0020] The outer edge of the magnet cross section further includes a short side and a long side opposite to each other, the short side connects the head ends of the first side and the second side, and the long side connects the tail ends of the first side and the second side; when the magnet is located at the first end of the adjustment path, when observed along the axial direction of the metal disk, the short side of the magnet cross section approaches or overlaps with the circular edge of the metal disk; when the magnet is located at the second end of the adjustment path, when observed along the axial direction of the metal disk, the long side of the magnet cross section approaches or overlaps with the circular edge of the metal disk.

[0021] The displacement frame is provided with two magnets respectively located on two opposite axial sides of the metal disk, each of the magnets has an inner side surface with a shape corresponding to the cross section, the inner side surface is parallel to the corresponding side surface of the metal disk, and the spacing between them remains unchanged; the shapes of the two magnets projected along the axial direction of the metal disk coincide with each other on the metal disk.

[0022] By adopting the above technical solution, the resistance adjustment device for sports equipment provided by the present invention has at least the following effects:

[0023] 1. In the process of the magnet moving from the first end to the second end at a constant speed along the adjustment path, the rate of increase of the projected area gradually accelerates as a whole, that is, the rate of increase of the resistance gradually accelerates as a whole, so that the operation response has a uniform trend and predictability, and the user experience is better.

[0024] Second, in the higher area of ​​the adjustable resistance range, the rate of increasing the resistance can still be gradually accelerated as the resistance increases, which is more in line with the user's expectations and needs of increasing the resistance for high-intensity exercise.

[0025] 3. In the final stage of increasing resistance, a shorter displacement distance and a shorter time can be used to reach the maximum resistance, so it is suitable for use in sports equipment that may need to quickly slow down the inertia of movement during exercise.

[0026] 4. It is particularly suitable as a resistance adjustment device for a flywheel vehicle that can be used for high-intensity interval training. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a side view of an exercise bike in the prior art;

[0028] Figure 2 yes Figure 1 A partial enlarged view of a resistance adjustment device in an exercise bike, wherein the adjustment path of the magnet and the critical positions at both ends are indicated;

[0029] Figure 3 In the form of sequence changes Figure 2 The magnet in the figure has multiple sections from the outer critical position to the inner critical position, where the black blocks represent the overlapping parts of the magnet and the metal disk in the axial direction;

[0030] Figure 4 show Figure 3 The variation of the overlapping part of the magnets in each segment;

[0031] Figure 5 yes Figure 3 A curve diagram showing the relationship between the area of ​​the overlapping portion and the position of the magnet;

[0032] Figure 6 It is a side view of a resistance adjustment device according to a preferred embodiment of the present invention and a transmission system of a sports equipment used therein;

[0033] Figure 7 yes Figure 6 A bottom view of the resistance adjustment device and the transmission system;

[0034] Fig. 8A yes Figure 6 A partial enlarged view of the resistance adjustment device in FIG. 1 , showing that the magnet is located at a first end of the adjustment path;

[0035] Figure 8B similar Fig. 8A , but the magnet is shown to be located at the second end of the adjustment path;

[0036] Fig. 9 yes Figure 6 A three-dimensional diagram of a displacement seat and its associated structure in a resistance adjustment device;

[0037] Fig.10 yes Fig. 9 A three-dimensional diagram of the displacement seat and its associated structure from another perspective;

[0038] Fig.11 In the form of sequence changes Fig. 8A , 8B The magnet in the adjustment path has multiple sections from the first end to the second end, wherein the blackened blocks represent the overlapping parts of the magnet and the metal disk in the axial direction;

[0039] Fig.12 show Fig.11 The variation of the overlapping part of the magnets in each segment;

[0040] Fig.13 yes Fig.11 A curve diagram showing the relationship between the area of ​​the overlapping portion and the position of the magnet;

[0041] Fig.14 Schematic diagram of the magnet shape and displacement direction in another possible embodiment of the present invention;

[0042] Fig.15 Schematic diagram of the magnet shape and displacement direction in another possible embodiment of the present invention;

[0043] Fig.16 It illustrates a relative relationship between the magnet and the metal disk in the present invention;

[0044] Fig.17 Another relative relationship between the magnet and the metal disk in the present invention is illustrated. DETAILED DESCRIPTION

[0045] Please read first Figure 6 and Figure 7 As shown in FIG. 1 , a resistance adjustment device 10 of a preferred embodiment of the present invention is assembled at the driven end of a transmission system 20 of a sports equipment. In order to contrast with the prior art described above, the resistance adjustment device 10 of this embodiment is also applied to Figure 1The flywheel bike shown can allow the user to adjust the motion resistance of the pedal according to the needs. However, it should be noted that the resistance adjustment device of the present invention can also be applied to other types of fitness bikes (such as upright bikes or recumbent bikes) through similar embodiments or other appropriate assembly methods, and even various sports equipment other than fitness bikes, including cardiopulmonary training equipment (such as elliptical trainers, steppers, rowing machines, etc.), weight training equipment, hybrid sports equipment (such as the running and weight training dual-purpose sports equipment disclosed in U.S. Patent No. 10,398,933), and any sports equipment that can use eddy current brakes to generate motion resistance and can adjust the resistance strength. The structure and function of the present invention introduced in this specification, regardless of the general concept or specific embodiment, unless explicitly limited to flywheel bikes, are also applicable to other types of fitness bikes or other types of sports equipment.

[0046] Back to the present embodiment, the resistance adjustment device 10 includes a circular metal plate 30, which is pivoted on a frame 15 according to a rotation axis A2 passing through its own center and corresponding to the left and right axis of the sports equipment, and can rotate in situ on the frame 15. The frame 15 is usually a metal bracket that fixes the sports equipment when it is in use, for example, Figure 6 The frame 15 shown may correspond to Figure 1 The frame 99 directly supports the pedal crank set 91 and the metal plate 93. Figure 1The metal disk 30 is formed of aluminum in one piece, has a predetermined diameter and thickness, and has a flat circular disk surface without hollowing, and can generate sufficient rotational inertia when rotating. When a user uses the sports equipment to perform a specific sport, the metal disk 30 can be driven to rotate by the user's sport. In this example, the user's sport output is transmitted to the metal disk 30 in the form of torque via the transmission system 20. Specifically, the transmission system 20 includes a prime mover shaft 21, a large pulley 22, a small pulley 23 and an annular belt 24. The prime mover shaft 21 is pivoted on the frame 15 according to the left and right axial directions. The large pulley 22 and the small pulley 23 are coaxially connected to the prime mover shaft 21 and the metal disk 30, respectively. The annular belt 24 is simultaneously wrapped around the large pulley 22 and the small pulley 23. Therefore, when the user's sport output (for example, the output of both feet to step on the bicycle pedals) drives the prime mover shaft 21 (for example, corresponding to the crankshaft of the bicycle) to rotate, it will also drive the metal disk 30 to rotate at a higher speed. In sports equipment such as flywheels or elliptical exercise machines, the large pulley 22 is usually fixed to the driving shaft 21, and the small pulley 23 is also fixed to the metal disk 30. In other words, the driving shaft 21 and the metal disk 30 are bidirectionally driven. Therefore, during exercise, the inertial force of the metal disk 30 driven by the driving shaft 21 also acts on the driving shaft 21, so that the driving shaft 21 can rotate smoothly and accelerate and decelerate smoothly; however, if it is an upright or recumbent bicycle, a one-way bearing is usually set between the large pulley 22 and the driving shaft 21, so that the pedals of the bicycle can stop or even reverse at will during the forward movement without being restrained by the inertial force. The above structure that the metal disk 30 can be driven to rotate by the user's movement is basically still a prior art.

[0047] See also Fig. 8A and Figure 8B As shown, the resistance adjustment device 10 further includes a displacement seat 40 located near the circular edge 31 of the metal plate 30. The displacement seat 40 is disposed on the frame 15 in a displaceable manner. In this embodiment, the displacement seat 40 is pivotally disposed on the frame 15 according to a swing axis A3 corresponding to the left and right axial direction of the sports equipment, and can be swung and displaced within a predetermined angle range according to the control of the user, for example, Fig. 8A and Figure 8B The displacement seat 40 is also controlled by conventional techniques in the art, that is, a torsion spring 70 is provided between the displacement seat 40 and the frame 15 (see Fig. 9 , Fig.10 ), the elastic force of the torsion spring 70 can cause the displacement seat 70 to rotate relative to the frame 15 in the first direction ( Fig. 8A , Figure 8BOne end of a steel cable 80 is connected to the displacement seat 40, and the other end is connected to a winding wheel (not shown in the figure, usually located near the console of the sports equipment), and the winding wheel is connected to an adjustment member (for example, a step-by-step or stepless rotation member) that can be adjusted within a predetermined adjustable range. Figure 1 When the user rotates the adjustment member in a direction representing an increase in resistance by a certain amount, the reel that rotates accordingly will reel the steel cable 80 to a corresponding length, so that the displacement seat 40 is pulled by the steel cable 80 to resist the elastic force of the torsion spring 70 to move in the opposite second rotation direction ( Fig. 8A , Figure 8B ; when the user rotates the adjustment member in the direction representing the reduction of resistance by a displacement amount, the reel that rotates accordingly will release the steel cable 80 by a corresponding length, so that the displacement seat 40 that is continuously acted upon by the torsion spring 70 will swing in the first rotation direction by a corresponding angle; when no external force is applied, the reel can be fixed at the current angle by friction. Simply put, within a predetermined adjustable range, the position of the adjustment member determines the position of the displacement seat 40, and when making adjustments, the displacement amount / displacement rate of the adjustment member and the displacement amount / displacement rate of the displacement seat 40 maintain a certain proportional relationship. For example, assuming that the adjustable range of the adjustment member is 200 degrees and the adjustable range of the displacement seat 40 is 50 degrees, when the adjustment member is rotated 20 degrees in a certain rotation direction, the displacement seat 40 will swing 5 degrees in the corresponding rotation direction.

[0048] See also Fig. 9 and Fig.10 As shown, the displacement seat 40 has two side plates 41 parallel to each other in the left and right axial directions. A plate-shaped magnet 50 is attached to the inner side of each side plate 41. The two magnets 50 are respectively located on two opposite axial sides of the metal plate 30 (see Figure 7 ), the inner side surface 51 of each magnet 50 is parallel to and close to the corresponding side surface of the metal disk 30. Even if the displacement seat 40 swings and / or the metal disk 30 rotates in place, the axial distance between each magnet 50 and the metal disk 30 remains unchanged. One of the magnets 50 faces the metal disk 30 with its N pole, and the other magnet 50 faces the metal disk 30 with its S pole. In this embodiment, the shape of the inner side surface 51 of each magnet 50 (corresponding to the cross-sectional shape of the magnet 50 on the radial plane of the rotation axis A2) is a non-parallelogram. Because the two magnets 50 have the same shape and size and their positions and angles correspond, when observed along the axial direction of the metal disk 30 (for example Fig. 8A , Figure 8B ), the uneven quadrilateral cross-sections of the two magnets 50 completely overlap.

[0049] like Fig.12As shown, the outer edge of the cross section of each magnet 50 includes a first side 52 and a second side 53 opposite to each other, and a short side 54 and a long side 55 opposite to each other, and all four (52, 53, 54, 55) are straight lines and no two of them are parallel. The relative direction of the first side 52 and the second side 53 corresponds to the relative direction of the magnet 50 and the swing axis A3 (roughly the up and down direction in this embodiment), wherein the first side 52 is closer to the swing axis A3 than the second side 53 (in this embodiment, the magnet 50 is located below the swing axis A3, and the second side 53 is located below the first side 52), and the length of the second side 53 is greater than the length of the first side 52. The first side 52 and the second side 53 each have a head end and a tail end, and the two head ends are located on the same side ( Fig.12 ) and are separated by a convergence distance, with the two tail ends located on the other side ( Fig.12 The cross section 52 and the second side 53 are located on the left side of the cross section and are separated by a divergent distance greater than the convergence distance. The width of the cross section between the first side 52 and the second side 53 gradually widens from the side where the two ends are located to the side where the two ends are located. The short side 54 connects the first side 52 and the second side 53 at the head end, and its length is equal to the convergence distance. The long side 55 connects the first side 52 and the second side 53 at the tail end, and its length is equal to the divergent distance.

[0050] like Fig. 9 and Fig.10 As shown in FIG. 4 , a plurality of transverse positioning pins 42 are further provided on the inner side of each side plate 41 of the displacement seat 40, and the bottom end surface (corresponding to the second side 53) of each magnet 50 abuts against two of the positioning pins 42, and the front end surface (corresponding to the long side 55) of each magnet 50 abuts against another positioning pin 42. With the design of the positioning pins 42, the assembler can quickly and accurately position the magnet 50 when bonding it to the displacement seat 40, and the stability of the magnet 50 on the displacement seat 40 can also be increased.

[0051] Please refer again Fig. 8A and Figure 8B When the displacement seat 40 is controlled by the user to swing according to the swing axis A3, the magnet 50 can follow the swing of the displacement seat 40 and move along an arc-shaped adjustment path T2 across the circular edge 31 of the metal plate 30 to approach or move away from the rotation axis A2 of the metal plate 30 (hereinafter referred to as the metal plate axis), so that the magnet 50 moves along the axial direction (i.e. Fig. 8A , Figure 8BThe area projected on the metal disk 30 by the two magnets 50 along the axial direction of the metal disk 30 (in the direction of observation) increases or decreases. Because the shapes of the two magnets 50 projected on the metal disk 30 along the axial direction of the metal disk 30 coincide, the relationship between the magnet position and the projected area described below is applicable to any magnet 50. When the magnet 50 is located at the end of the adjustment path T2 that is farther away from the metal disk axis A2 (for example, the left end in the figure, hereinafter referred to as the first end), the projected area is the minimum value of the adjustable range. Conversely, when the magnet 50 is located at the end of the adjustment path T2 that is closer to the metal disk axis A2 (for example, the right end in the figure, hereinafter referred to as the second end), the projected area is the maximum value of the adjustable range. In this embodiment, when the magnet 50 is located at the first end, as Fig. 8A As shown, the magnet 50 is adjacent to the outer side of the circular edge 31 of the metal plate 30, and the projected area is substantially zero; when the magnet 50 is located at the second end, as shown in FIG. Figure 8B As shown, the magnet 50 is shaped adjacent to the inner side of the circular edge 31 of the metal plate 30 , and the projected area is substantially equal to the cross-sectional area of ​​the magnet 50 .

[0052] More specifically, the relative direction of the short side 54 and the long side 55 of the magnet cross section corresponds to the displacement direction of the magnet 50 along the adjustment path T2 toward or away from the metal disk axis A2 (in this embodiment, it is roughly the front-to-back direction, i.e. Fig. 8A , Figure 8B In the left-right direction), the short side 54 is closer to the metal disk axis A2 than the long side 55.

[0053] When the magnet 50 is located at the first end of the adjustment path T2, when observed along the axial direction of the metal disk 30, the head ends of the first side 52 and the second side 53 of the magnet cross section are closer to the circular edge 31 of the metal disk 30 than the tail ends. In other words, the side with a narrower width (i.e., the side where the short side 54 is located) of the magnet cross section is closer to the circular edge 31 than the side with a wider width (i.e., the side where the long side 55 is located). Moreover, at least one of the first side 52 and the second side 53 intersects with the circular edge 31 at one point. In this embodiment, the short side 54 approaches or overlaps with the circular edge 31, and the head ends of the first side 52 and / or the second side 53 are exactly located on the circular edge 31, so that the projected area is zero (or small enough to be regarded as zero). Correspondingly, the resistance applied by the magnet 50 to the metal disk 30 is the minimum value of the adjustable range. In other possible embodiments (not shown), when the magnet 50 is located at the first end of the adjustment path T2, when observed along the axial direction of the metal disk 30, the head ends of the first side 52 and the second side 53 of the magnet cross section are both located on the inner side of the circular edge 31 of the metal disk 30. In other words, the narrower side of the magnet cross section is partially located within the circular edge 31, so that the minimum value of the projected area is greater than zero.

[0054] In contrast, in the present embodiment, when the magnet 50 is located at the second end of the adjustment path T2, when observed along the axial direction of the metal disk 30, the magnet 50 completely (or almost completely) overlaps the metal disk 30, and the long side 55 of the magnet cross section approaches or overlaps the circular edge 31 of the metal disk 30, so that the projected area is equal to (or almost equal to) the cross-sectional area of ​​the magnet 50. Correspondingly, the resistance applied by the magnet 50 to the metal disk 30 is the maximum value of the adjustable range. In fact, the cross-sectional area of ​​the magnet 50 can be compared with the circular cross-sectional area of ​​the ingot magnet 98 in the prior art, so that the maximum resistance that the magnet 50 may apply to the metal disk 30 is equal to the maximum resistance in the prior art (assuming that the parameters such as the metal disk specification, magnet thickness and material are the same as before). Of course, the magnet size and maximum resistance in the present invention can still be appropriately selected according to actual needs. In other possible embodiments (not shown), when the magnet 50 is located at the second end of the adjustment path T2, when observed along the axial direction of the metal disk 30, the tail ends of the first side 52 and the second side 53 of the magnet cross section are both located outside the circular edge 31 of the metal disk 30. In other words, the wider side of the magnet cross section is partially located outside the circular edge 31, so that the maximum value of the projected area is less than the cross-sectional area of ​​the magnet 50.

[0055] like Fig. 9 and Fig.10 As shown in FIG. 1 , in this embodiment, a friction block 60 made of rubber material is further provided on the displacement seat 40. The friction block 60 is fixed between the two side plates 41 and is located on the side of the two magnets 50 that is farther from the metal disk axis A2. The friction block 60 has a friction surface 61 facing the metal disk 30. The friction surface 61 (ignoring the grooves on the surface and regarded as a plane) is substantially aligned with the long sides 55 of the two magnets 50. When the user controls the displacement seat 40 to swing in the second rotation direction until the magnet 50 reaches the vicinity of the second end of the adjustment path T2, in addition to the maximum resistance exerted by the magnet 50 on the metal disk 30, the friction surface 61 also contacts the circumferential surface of the metal disk 30, directly hindering the rotation of the metal disk 30 with friction force. According to the implementation selection or the wear state of the friction block 60, when observed along the axial direction of the metal disk 30, the friction surface 61 of the friction block 60 may be completely or partially located within the cross-sectional range of the magnet 50, or may be completely located outside the cross-sectional range of the magnet 50. The friction block 60 is mainly used for rapid braking or preventing the metal plate 30 from rotating, and is particularly suitable for use in flywheel vehicles; on the contrary, some sports equipment may not require a friction block.

[0056] It should also be noted that, as in the prior art, in order to ensure that the projection area of ​​the magnet 50 can be adjusted to zero at the minimum and / or can be adjusted to be equal to the cross-sectional area of ​​the magnet 50 at the maximum, the possible displacement range of the magnet 50 is usually slightly exceeded. Fig. 8A and / or Figure 8B For example, in response to a user rotating an adjustment member (such as adjustment knob 96), the displacement seat 40 may be moved by Fig. 8AThe position shown in the figure is slightly moved clockwise, and / or Figure 8B The position shown in the figure is then slightly swung counterclockwise until the displacement seat 40 or the adjustment member is blocked by a preset stop structure (not shown), or the friction surface 61 of the friction block 60 abuts against the circumferential surface of the metal plate 30. However, even if the magnet 50 is Fig. 8A The position shown in FIG. 1 (i.e., the first end of the adjustment path T2) is further away from the metal disk axis A2, and the projected area is still zero and will not be smaller; similarly, even if the magnet is Figure 8B The position shown (i.e., the second end of the adjustment path T2) is closer to the metal disk axis A2, and the projected area is still equal to the cross-sectional area of ​​the magnet 50 and will not be larger. This means that the displacement of the magnet 50 can only increase or decrease the projected area within the range of the adjustment path T2, or in other words, can increase or decrease the resistance applied by the magnet 50 to the metal disk 30, thereby producing the effect of adjusting the resistance (Note: In fact, the range of the adjustment path T2 is defined by the two critical positions where the magnet 50 can apply the minimum resistance and the maximum resistance to the metal disk 30.). Based on the above meaning, the "adjustable range" of the magnet 50 or the displacement seat 40 (e.g., 50 degrees in the previous example) basically corresponds to the range of the adjustment path T2, rather than the actual possible displacement range; the same is true for the "adjustable range" of the adjustment member used to control the displacement of the displacement seat 40 and the magnet 50 (e.g., 200 degrees in the previous example).

[0057] It can be imagined that when the adjusting member is located at one end of its adjustable range, the magnet 50 is correspondingly located at the first end of the adjustment path T2. Conversely, when the adjusting member is located at the other end of its adjustable range, the magnet 50 is correspondingly located at the second end of the adjustment path T2. Moreover, if the adjusting member is displaced from one end of its adjustable range to the other end at a constant speed, the magnet 50 will also be displaced from the first end to the second end along the adjustment path T2 at a constant speed at the same time. In short, the position of the magnet 50 in the adjustment path T2 reflects the position of the adjusting member in its adjustable range at any time.

[0058] Fig.11The multiple levels of the magnet 50 from the first end to the second end of the adjustment path T2 are shown in the form of a sequence change, and the magnet position in each level is equally variable. Specifically, the state with the minimum resistance is set to Lv.0, and the state with the maximum resistance is set to Lv.10. Assuming that the adjustable range of the magnet 50 (i.e., the arc of the circular adjustment path T2) is 50 degrees, the magnet positions of the two adjacent levels are all 5 degrees apart. A concept to be expressed here is that if the adjustment member rotates one-tenth of the full length of its adjustable range (for example, 20 degrees out of 200 degrees), the magnet 50 will also move one-tenth of the full length of its adjustable range, for example, from the position of Lv.0 in the figure to the position of Lv.1; if the adjustment member rotates half of the full length of its adjustable range, the magnet 50 will also move half of the full length of its adjustable range, for example, from the position of Lv.0 in the figure to the position of Lv.5.

[0059] Fig.11 The black blocks in each section represent the overlapping parts of the magnet 50 and the metal disk 30 in the axial direction. Fig.12 The variation of the overlapping portion of the magnet 50 at each stage is shown, where: when the magnet 50 is located at Lv.0, no portion of the magnet cross section overlaps with the metal disk 30; when the magnet 50 is located at Lv.1, a small area (b1) of the side of the short side 54 of the magnet cross section overlaps with the metal disk 30; when the magnet 50 moves from Lv.1 to Lv.2, the portion of the magnet cross section overlapping with the metal disk 30 will increase by a slightly larger area (b2); and the same applies thereto, that is, when the magnet 50 moves to Lv.3, Lv.4, Lv.5, ..., Lv.10 in sequence, the overlapping portion will increase in area by b3, b4, b5, ..., b10 in sequence, and finally be equal to (or nearly equal to) the cross-sectional area of ​​the magnet 50.

[0060] Depend on Fig.12 It can be seen that the 10 areas b1 to b10 have approximately equal lateral widths, but their longitudinal lengths gradually increase from b1, which is approximately equal to the length of the short side 54, to b10, which is approximately equal to the length of the long side 55. Obviously, every time the magnet 50 moves forward a unit distance (for example, swinging 5 degrees), the portion of the magnet cross section overlapping the metal disk 30 will increase a little, and the area increased in each section will be larger than the previous one, from the lowest section (projected area is zero) to the highest section (projected area is equal to the cross-sectional area of ​​the magnet 50). For example, Fig.12a2 is larger than a1, a3 is larger than a2, a4 is larger than a5, and so on, until the last a10 is also larger than the previous a9. It must be emphasized here that the highest level is set as Lv.10, and the cross-section of the magnet 50 is divided into 10 small blocks according to the number of levels. This is just a simple example for the convenience of explanation. In fact, the rotation of the adjustment member (such as the adjustment handle 96) used to control the displacement of the magnet 50 may be a step-type rotation with various numbers of stages such as 16 stages, 20 stages, 24 stages, etc., or the rotation of the adjustment member may be a stepless rotation, that is, it can be rotated to any angle and stopped at any position in the adjustable range. In other words, the controlled displacement of the magnet 50 does not actually have a specific unit distance. In any case, when the magnet 50 moves from the first end to the second end along the adjustment path T2, the overlapping portion of the magnet 50 and the metal plate 30 expands from the side with a narrower width of the magnet cross section (i.e., the side where the short side 54 is located) to the side with a wider width (i.e., the side where the long side 55 is located), so the rate of increase of the projected area always gradually accelerates.

[0061] Fig.13 is a graph showing the relationship between the projection area and the magnet position in this embodiment. Figure 5 The representation method of Fig.13 The horizontal axis represents the position of the magnet, indicating 10 equally spaced positions corresponding to each stage, and the vertical axis represents the projected area, with the cross-sectional area of ​​the magnet 50 as the maximum value, indicating the percentage of the projected area under each stage relative to the maximum value, which also represents the percentage of the resistance applied by the magnet 50 to the metal disk 30 relative to the maximum resistance that can be applied. As shown in the data in the figure, from Lv.0 to Lv.10, each time the magnet advances one stage (i.e., one-tenth of the total length of the adjustment path T2), the resistance increases by 7.0%, 7.6%, 8.2%, 8.9%, 9.6%, 10.3%, 11.0%, 11.8%, 12.7% and 12.9% of the maximum resistance, indicating that the rate of resistance increase is gradually accelerating as a whole. From another point of view, based on Fig.13 As shown in the proportional relationship, in order to increase the resistance from zero to 20% of the maximum resistance, from 20% to 40%, from 40% to 60%, from 60% to 80%, and from 80% to 100%, the magnet needs to advance approximately 26.7%, 22.0%, 19.0%, 16.7% and 15.6% of the total length of the adjustment path T2, respectively, which also shows that the adjustment efficiency (the ratio of the resistance change to the displacement distance) gradually increases.

[0062] As can be seen from the above preferred embodiments, the resistance adjustment device 10 of the present invention is designed to have a specific geometric shape of the inner side surface 51 of the magnet 50 facing the metal disk 30 (corresponding to the cross section of the magnet 50 on the radial plane of the metal disk axis A2), and to arrange the magnet 50 and the metal disk 30 in a specific relative relationship (including the position and angle change of the magnet cross section relative to the metal disk 30 when the magnet 50 moves along the adjustment path T2), so that in the process of the magnet 50 moving from the first end to the second end along the adjustment path T2 at a constant speed, the rate of increase of the area of ​​the magnet 50 projected along the axial direction of the metal disk 30 on the metal disk 30 is gradually accelerated as a whole, that is, the rate of increase of the resistance applied by the magnet 50 to the metal disk 30 is gradually accelerated as a whole. In the process of the magnet 50 moving from the first end to the second end along the adjustment path T2 (at least when the projected area increases from the minimum value to 5% to 95% of the difference between the maximum value and the minimum value), when observed along the axial direction of the metal disk 30, the circular edge 31 of the metal disk 30 keeps passing through the first side 52 and the second side 53 of the magnet cross section at the same time.

[0063] Through the resistance adjustment device provided by the present invention, when users of sports equipment adjust the exercise resistance, they have a better user experience because the operation response has a unified trend and predictability. Secondly, in the higher area of ​​the adjustable resistance range, the rate of increasing the resistance can still gradually increase as the resistance increases, which is more in line with the user's expectations and needs of increasing the resistance for high-intensity exercise. In addition, because the maximum resistance can be reached with a shorter displacement distance and a shorter time in the final stage of increasing the resistance, it is suitable for use in sports equipment that may need to quickly slow down the inertia of the movement during exercise. Combining the above effects and characteristics, the present invention is particularly suitable as a resistance adjustment device for a flywheel vehicle that can be used for high-intensity interval training.

[0064] Fig.14Another possible embodiment (partial) of the present invention is shown, which is different from the above-mentioned preferred embodiment mainly in that the cross section of the magnet 250 is trapezoidal, and its outer edge includes a first side (top side in the figure) and a second side (bottom side in the figure) that are opposite but not parallel, and a short side (right side in the figure) and a long side (left side in the figure) that are parallel and opposite to each other; in addition, when adjusting the resistance, the magnet 250 is moved along the radial direction 232 of the metal disk 230 across the circular edge 231 of the metal disk 230 to approach or move away from the axis of the metal disk (located to the right of the magnet 250 in the figure, but not shown in the figure), so that the area of ​​the magnet 250 projected on the metal disk 230 along the axial direction of the metal disk 230 increases or decreases gradually; wherein, the relative direction of the short side and the long side of the magnet cross section corresponds to the displacement direction of the magnet 250 approaching or moving away from the axis of the metal disk, and the short side is closer to the axis of the metal disk than the long side. Therefore, as the magnet 250 moves toward the axis of the metal disk, the overlapping portion of the magnet 250 and the metal disk 230 in the axial direction will expand from the narrower side of the magnet cross section to the wider side (as indicated by several imaginary lines on the magnet cross section in the figure), so that the rate of increase of the projected area will gradually accelerate, that is, the rate of increase of the resistance will gradually accelerate.

[0065] Fig.15 Another possible embodiment (partial) of the present invention is shown, in which the cross section of the magnet 350 is approximately trapezoidal, but the four sides of the outer edge are not straight lines, for example, the first side (the top side in the figure) and the second side (the bottom side in the figure) are both convex arcs that bulge outward (as shown in the figure), or they may also be concave arcs that are sunken inward. Even so, the width of the magnet cross section between the first side and the second side is still gradually widened from the side where the short side is located (the right side in the figure) to the side where the long side is located (the left side in the figure). Similarly, as the magnet 350 moves along the radial direction 332 of the metal disk 330 toward the axis of the metal disk, the overlapping part of the magnet 350 and the metal disk 330 in the axial direction will expand from the side with a narrower width of the magnet cross section to the side with a wider width (as shown by several imaginary lines on the magnet cross section in the figure), so that the rate of increase in resistance is gradually accelerated.

[0066] In other possible embodiments (not shown), when the resistance is at the minimum value of the adjustable range, that is, when the magnet is located at the first end of the adjustment path, when observed along the axial direction of the metal disk, the circular edge of the metal disk does not intersect with the first side and the second side of the magnet cross section. Instead, the side edge (short side) of the outer edge of the magnet connecting the first side and the second side may be a convex arc or other protruding shape, and intersects with the circular edge of the metal disk.

[0067] In the present invention, a motor or a linear actuator may be used to drive the displacement of the magnet. The user may also control the displacement of the magnet through an electronic operation interface, for example, each time a button marked "+" (representing increased resistance) is pressed, the magnet is moved forward one level, and each time a button marked "-" (representing decreased resistance) is pressed, the magnet is moved back one level.

[0068] Fig.16 The figure shows a relative relationship between the magnet and the metal disk in the present invention, wherein the outer edge of the metal disk 430 farthest from its rotation axis (center) forms a circular edge 431, and the magnet 450 is located near the outer edge of the metal disk 430, that is, the circular edge 431, and the shape of the magnet cross section gradually widens from the side closer to the metal disk axis to the side farther from the metal disk axis, so that when the magnet 450 crosses the circular edge 431 and approaches the metal disk axis (for example, in the direction indicated by the arrow in the figure), the area projected by the magnet 450 on the surface of the metal disk 430 increases accordingly, and the applied resistance increases accordingly. In other words, of the two opposite ends of the adjustment path (not shown in the figure) of the magnet 450, the first end corresponding to the minimum resistance will be farther away from the metal disk axis than the second end corresponding to the maximum resistance. Figure 6 , Fig.14 and Fig.15 The structures shown all belong to this type.

[0069] Fig.17 Another relative relationship between the magnet and the metal disk in the present invention is shown, wherein the disk surface of the metal disk 530 is in the shape of a ring, which may be coaxially fixed to the outer peripheral part of a flywheel and can rotate in situ with the flywheel around a rotation axis; the inner edge of the metal disk 530 closest to the rotation axis forms a circular edge 531, and the circular edge 531 also takes the rotation axis of the metal disk 530 as the center; the magnet 550 is located near the inner edge of the metal disk 530, that is, the circular edge 531, and the shape of the magnet cross section gradually widens from the side farther from the rotation axis (hereinafter referred to as the metal disk axis) to the side closer to the metal disk axis, so that when the magnet 550 crosses the circular edge 531 and moves away from the metal disk axis (for example, in the direction indicated by the arrow in the figure), the area projected by the magnet 550 on the disk surface of the metal disk 530 increases accordingly, and the applied resistance increases accordingly. That is to say, of the two opposite ends of the adjustment path (not shown in the figure) of the magnet 550, the first end corresponding to the minimum resistance is closer to the metal disk axis than the second end corresponding to the maximum resistance.

[0070] There may be only one magnet in the present invention, which is located alone on one axial side of the metal disk, with its inner side surface of a specific shape facing the corresponding side surface of the metal disk. It can also cause the rotating metal disk to produce an eddy current effect to form a rotational resistance, and the above-mentioned effect of the present invention can also be achieved when the resistance is adjusted.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resistance adjustment device for sports equipment, comprising: A frame; a metal plate, pivotally mounted on the frame according to a rotation axis, and capable of being rotated by the movement of a user of the sports equipment; the metal plate has a circular edge with the rotation axis as the center; A displacement seat, disposed on the frame, capable of displacement according to the control of the user; At least one magnet is arranged on the displacement seat, and can move closer to or farther from the rotation axis along an adjustment path across the circular edge of the metal disk as the displacement seat moves, so that the area of ​​the magnet projected on the metal disk along the axial direction of the metal disk increases or decreases; when the magnet is located at the first end of the adjustment path, the projected area is the minimum value of the adjustable range, and when the magnet is located at the second end of the adjustment path, the projected area is the maximum value of the adjustable range; Features: The cross section of the magnet on the radial plane of the rotation axis is non-circular, and the outer edge of the magnet cross section includes a first side and a second side opposite to each other, the first side and the second side each having a head end and a tail end, the two head ends are located on the same side and are separated by a convergence distance, the two tail ends are located on the other side and are separated by a divergence distance greater than the convergence distance, and the width of the magnet cross section between the first side and the second side gradually widens from the side where the two head ends are located to the side where the two tail ends are located; when the magnet is located at the first end of the adjustment path, the head ends of the first side and the second side of the magnet cross section are respectively closer to the circular edge of the metal disk than the tail ends.

2. The resistance adjustment device for sports equipment according to claim 1, characterized in that: The first side and the second side of the magnet cross section are two non-parallel straight lines.

3. The resistance adjustment device for sports equipment according to claim 1, characterized in that: When the magnet is located at the first end of the adjustment path, when viewed along the axial direction of the metal disk, at least one of the first side and the second side of the magnet cross section intersects the circular edge of the metal disk at one point.

4. The resistance adjustment device for sports equipment according to claim 3, characterized in that: In the process of the magnet moving from the first end to the second end along the adjustment path, at least the projected area increases from the minimum value by between 5% and 95% of the difference between the maximum value and the minimum value, and when observed along the axial direction of the metal disk, the circular edge of the metal disk keeps passing through the first side and the second side of the magnet cross section at the same time.

5. The resistance adjustment device for sports equipment according to claim 1, characterized in that: The outer edge of the magnet cross section also includes a short side, which connects the head ends of the first side and the second side; when the magnet is located at the first end of the adjustment path, when observed along the axial direction of the metal disk, the short side of the magnet cross section approaches or overlaps with the circular edge of the metal disk.

6. The resistance adjustment device for sports equipment according to claim 1, characterized in that: The outer edge of the magnet cross section also includes a long side, which connects the tail ends of the first side and the second side; when the magnet is located at the second end of the adjustment path, when observed along the axial direction of the metal disk, the long side of the magnet cross section approaches or overlaps with the circular edge of the metal disk.

7. The resistance adjustment device for sports equipment according to claim 1, characterized in that: The displacement seat is pivotally mounted on the frame according to a swing axis parallel to the rotation axis; the relative direction of the first side and the second side of the magnet cross section corresponds to the relative direction of the magnet and the swing axis.

8. The resistance adjustment device for sports equipment according to claim 7, characterized in that: The first side of the magnet cross section is closer to the swing axis than the second side, and the length of the second side is greater than the length of the first side.

9. The resistance adjustment device for sports equipment according to claim 8, characterized in that: The outer edge of the magnet cross section further includes a short side and a long side opposite to each other, the short side connects the head ends of the first side and the second side, and the long side connects the tail ends of the first side and the second side; when the magnet is located at the first end of the adjustment path, when observed along the axial direction of the metal disk, the short side of the magnet cross section approaches or overlaps with the circular edge of the metal disk; when the magnet is located at the second end of the adjustment path, when observed along the axial direction of the metal disk, the long side of the magnet cross section approaches or overlaps with the circular edge of the metal disk.

10. The resistance adjustment device for sports equipment according to claim 1, characterized in that: The displacement frame is provided with two magnets respectively located on two opposite axial sides of the metal disk, each of the magnets has an inner side surface with a shape corresponding to the cross section, the inner side surface is parallel to the corresponding side surface of the metal disk, and the spacing between them remains unchanged; the shapes of the two magnets projected along the axial direction of the metal disk coincide with each other on the metal disk.

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