Sports equipment with magnetic resistance device

Abstract

The invention relates to sports equipment with a magnetic resistance device. The sports equipment comprises a frame body with a shaft part, a metal disc pivoted on the shaft part, a supporting seat with an adapter and a bracket fixedly provided with a magnetic element, and a force measuring sensor arranged between the adapter and the frame body, wherein the adapting piece is arranged at the position, close to the metal disc, of the frame body, one side face of the metal disc can extend outwards in the axis direction to form an annular frame in a protruding mode, and the bracket is arranged on the adapting piece in a reciprocating displacement adjusting mode, so that the magnetic element can move between the outer side of the annular frame and the center line of the annular frame. When the magnetic element moves from the outer side of the annular frame to be close to the metal disc in the rotating state, a relative distance can be kept between the magnetic element and the annular frame in the diameter direction, magnetic resistance acting force in the tangential direction is applied to the annular frame, meanwhile, the bracket can be in linkage with the adapter to act on the force measuring sensor to abut against the frame body to generate counter-acting force, and the force measuring sensor is driven to rotate. The magnetic resistance acting force can be directly calculated on the basis of the reacting force, errors can be reduced by reading power parameters through the mechanism, the accuracy can be improved, and the data reliability can be improved.

Description

Technical Field

[0001] The present invention relates to sports equipment, and particularly to a sports equipment with a magnetic resistance device. Background Art

[0002] In general fitness equipment (such as a flywheel exercise bike or an elliptical machine), in order to enable users to adjust the operation difficulty or effort according to their own training needs, a resistance system is usually configured in the structure, so that users can apply different degrees of resistance to a flywheel or other similar rotating elements through the above resistance system to obtain the effect of fitness training.

[0003] Please refer to Figure 1 as shown Figure 1 is a side view of a magnetic resistance exercise bike in the prior art. It can be used by a user to simulate the exercise state of riding a bicycle in the wild indoors. When the user drives a pedal crankset 81 of the exercise bike 80 in a pedaling and rotating manner, it will drive a metal disk 83 to rotate around a shaft portion 84 through a transmission system 82; among them, the exercise bike 80 is provided with a resistance adjustment device 85 for adjusting the rotation resistance of the metal disk 83. A common one is an eddy current brake (Eddycurrent brake, abbreviated as ECB), which is a non-frictional braking method and allows users to adjust the effort according to their own needs.

[0004] Please refer to Figure 2 as shown Figure 2 is Figure 1 a schematic diagram of the displacement trajectory of the magnet group of the magnetic resistance exercise bike. The technical means of the resistance adjustment device 85 mainly uses a power source 85a (such as a combination of components such as a motor, gears, pulleys, and connecting rods) to drive each magnet group 85b to move away from or close to the outer peripheral surface of the metal disk 83 in a swinging and approaching radial displacement manner with an axis 85c as the center point from the outside of the metal disk 83, and keep an appropriate distance between each magnet group 85b and the metal disk 83. When each magnet group 85b moves from the outside of the metal disk 83 close to the rotating metal disk 83, the metal disk 83 will generate a magnetic resistance force by cutting the magnetic field. At this time, each magnet group 85b can be projected along the axial direction of the metal disk 83 onto the outer peripheral surface of the metal disk 83 to form a magnetic field cutting area. The magnetic resistance force of the above resistance adjustment device 85 and the magnetic field cutting area are in a positive correlation relationship. Users can adjust the size of the magnetic resistance force to meet the requirements of different exercise intensities.

[0005] Among them, there is a positive correlation between the magnetic flux and the corresponding magnetic resistance force generated thereby. The magnetic flux can also be understood as the number of magnetic force lines passing perpendicularly through a unit cross-section. Without considering the influence of the material combination of the magnet on its magnetic properties and assuming that the magnets have the same magnetic force intensity, it can be understood that the main factors affecting the magnetic flux are the coverage area of the magnet projected onto the magnetized object and the distance between the magnet and the magnetized object. The above main factors correspond to the cutting magnetic field area and the spacing respectively. When the cutting magnetic field area is larger, the magnetic resistance force is larger; conversely, when the cutting magnetic field area is smaller, the magnetic resistance force is smaller. When the spacing is larger, the magnetic resistance force is smaller; conversely, when the spacing is smaller, the magnetic resistance force is larger. However, there are limiting conditions. The spacing cannot be zero and cannot be too large. An appropriate spacing must be adjusted to allow the magnet to magnetize the magnetized object to achieve a better magnetic resistance effect. Therefore, in the prior art, designing to retain an appropriate spacing is to fix the distance between the magnet and the magnetized object, so that the magnetic resistance force and the cutting magnetic field area are in a positive correlation relationship.

[0006] In recent years, power training has become popular in the fitness bike industry. It mainly involves the user operating the fitness bike to generate relevant mechanical values and digitalizing and integrating them for recording, including power (Watt). Using the relevant data can facilitate users or trainers to refer to and formulate future exercise plans, and customize a more efficient training plan for individuals. Therefore, power display has become one of the indispensable standard data on the display panel of high-end fitness bikes in the fitness training plans on the market. As the basic calculation value in the training plan, the accompanying accuracy and reliability of power are even more important. A power fitness bike can display the intensity during exercise on a display panel. Currently, the power measurement on fitness bikes mainly uses a direct measurement method, and the way to obtain parameters is closely related to the components inside the fitness bike.

[0007] According to the structure of the magnetic resistance type fitness bike in the above prior art to calculate the data of the flywheel power, its power formula is: P = Τ×ω, P = (F×L)×ω. It mainly requires three parameters, the magnetic resistance force F, the force arm L, and the angular velocity ω (not marked). The magnetic resistance force F can be measured by installing a dynamometer 85d on the power source 85a. The angular velocity ω can also be obtained by installing a magnetic body 86 on the driving wheel of the transmission system 82 and newly fixing a Hall sensor 87 on the fitness bike 80 in the rotation path of the magnetic body 86. From the mechanical actuation method in the prior art, it can be understood that the force arm L is the distance between each magnet group 85b and the shaft part 84 at the moment when the magnetic resistance force F is generated. The technical means for resistance adjustment is to keep an appropriate and fixed spacing between each magnet group 85b, reduce one of the variable factors of the magnetic flux, and directly affect the size of the cutting magnetic field area by changing the force arm L to adjust the size of the magnetic resistance force F. The above technical means can be classified as a magnetic resistance device with a variable force arm.

[0008] However, the resistance adjustment device 85 of the above prior art still has the following defects. First, since its technical means is that the magnet group 85b moves away from or approaches the metal disc 83 in a swinging manner close to the radial displacement, the lever arm L presents a variable value. In order to immediately obtain the variable value data of the lever arm L, a position sensor 88 must be installed in the vicinity of the magnet group 85b. Only in this way can the variable value data of the lever arm L be tracked immediately and converted into a power value. However, using this method will increase the cost of installing the position sensor 88, and the position sensor 88 is not suitable for high-precision measurement. It is easily affected by operating environment, temperature, vibration and time-related factors, resulting in insufficient stability, and may produce unexpected errors, thus affecting the accuracy of the power value.

[0009] Second, some operators will also consider reducing the cost of installing the position sensor 88 and choose not to install the position sensor 88. Instead, they directly use the distance between the fixed element that is not affected by the position during the user's resistance adjustment process and the shaft portion 84 as the assumed lever arm L, and then estimate the lever arm L by means of calibration. The above fixed element can preferably be a motor adjacent to the magnet group 85b. However, as long as it is an estimated calculation method, calibration must be carried out, which is more likely to produce errors and it is difficult to control the accuracy, ultimately affecting the reliability of the power value.

[0010] Based on the above-mentioned deficiencies, it can be seen that there is a certain degree of room for improvement in the magnetoresistive device with a variable lever arm. Therefore, an innovative structure of fitness equipment is needed to overcome the defects of this technical means, and the mechanism combination of the resistance device needs to be further optimized and improved in order to improve the accuracy and reliability of the fitness equipment for power calculation. Summary of the Invention

[0011] In view of the above problems, the main object of the present invention is to provide a sports equipment with a magnetoresistive device, which optimizes and improves the mechanism of the resistance device to improve the accuracy and reliability of the fitness equipment for power calculation.

[0012] To achieve the above object, a sports equipment with a magnetoresistive device provided by the present invention includes: a base; a metal disc pivotally mounted on a shaft portion of the frame body for a user to drive it to rotate, and defining a first side surface, a second side surface, a diameter direction and an axis direction; and is characterized in that: the metal disc has an annular frame protruding outward along the axis direction from the second side surface; a support base having an adapter and a bracket fixedly provided with a magnetic element, the adapter is disposed at a position of the frame body adjacent to the metal disc, and the bracket is disposed on the adapter in a manner capable of reciprocally adjusting displacement so that the magnetic element can be displaced between a first position and a second position. In the first position, the magnetic element is located outside the annular frame, and in the second position, the magnetic element is located on a center line of the annular frame. Wherein, the displacement path between the first position and the second position is the same displacement plane, and the displacement plane can be perpendicular to the diameter direction. When the magnetic element is displaced from the first position to the second position, the magnetic element overlaps with the annular frame and a relative distance can be maintained between the magnetic element and the annular frame along the diameter direction; a force measuring sensor is disposed between the adapter and the frame body. When the metal disc rotates, the magnetic element is adjusted to be displaced from the first position to the second position to apply a magnetoresistive force in a tangential direction to the annular frame. At the same time, the bracket can drive the adapter to act on one side of the force measuring sensor, and the other side of the force measuring sensor abuts against the frame body to generate a reaction force, and the magnetoresistive force can be obtained by converting based on the reaction force.

[0013] In the technical solution of the present invention described above, the annular frame is located at the periphery of the metal disc, and the perpendicular distance between the shaft portion and the tangential direction of the magnetoresistive force is the radius of the metal disc.

[0014] One side of the adapter is provided with a first rotating shaft that can be movably disposed on the frame body, and a second rotating shaft perpendicular to the first rotating shaft, and the bracket can be pivotally mounted on the second rotating shaft so that the magnetic element reciprocally adjusts displacement between the first position and the second position with the second rotating shaft as a rotation center.

[0015] A base is fixedly provided on one side of the frame body at a position adjacent to the metal disc, the adapter can be disposed on one side of the base, and the support base forms an inclined angle relative to the frame body. When the magnetoresistive force is generated, the acting direction of the reaction force is perpendicular to the tangential direction of the magnetoresistive force.

[0016] One end of the bracket is provided with a reduction motor, and the user can reciprocally displace the bracket in a way that the pitch can be adjusted. When the magnetic element is displaced from the first position to the second position, the magnetic element projects along the diameter direction onto the annular frame to form a cutting magnetic field area. When the magnetic element is located at the first position, the cutting magnetic field area is the minimum value, and the magnetoresistive force is the minimum value. When the magnetic element is located at the second position, the cutting magnetic field area is the maximum value, and the magnetoresistive force is the maximum value.

[0017] The magnetic element has a shape of a round cake plane, and the surface normal of one side of the magnetic element can be perpendicular to the axis direction.

[0018] A deformable first elastic member is clamped between the adapter and the frame body, enabling the force measuring sensor to form a pre-pressed state.

[0019] One end of the bracket is provided with a deformable second elastic member, and the stretching direction of the second elastic member is arranged in the same plane as the displacement plane.

[0020] The bracket has a bracket and an auxiliary bracket symmetrically arranged with the bracket, and the number of the magnetic elements is more than two, and they are respectively fixed on the inner side surfaces of the bracket and the auxiliary bracket in a pairwise symmetrical manner. When each magnetic element is displaced to the second position, each magnetic element can be respectively adjacent to an inner side surface and an outer side surface of the annular frame, and the relative distance between each magnetic element and the outer side surface and the inner side surface is maintained along the diameter direction.

[0021] One side of the adapter is provided with a guiding block, and one side of the bracket is provided with a limiting track for the guiding block to slide. The track direction of the limiting track is parallel to the axis direction, and the magnetic element can reciprocally adjust and displace between the first position and the second position along the axis direction.

[0022] Adopting the above technical solution, one of the purposes of the present invention is mainly to move the magnetic element away from or close to the rotating annular frame in a manner close to axial displacement from the outside of the annular frame to generate the magnetoresistive force. Thus, the force arm used for calculating power can be designed as a fixed value to simplify the reading of the force arm, and the length of the force arm can be defined by the design position of the annular frame. Compared with the magnetoresistive device adopted in the prior art, the force arm to be read can be converted from a variable value to a fixed value, and there is no need to install a position sensor adjacent to the magnet group. By changing the reading method of the force arm in the power parameter using the above structural design, unpredictable variables can be reduced to improve the accuracy of the displayed power.

[0023] Adopting the above technical solution, for the second object of the present invention, the inclination angle formed by the support seat relative to the frame body is designed by using the base, which can make the support seat cooperate with the direction of the magnetoresistive force during the movement process. When the magnetoresistive force is generated, it is designed that the force receiving direction of the reaction force is perpendicular to the tangent direction of the magnetoresistive force. Then, the magnetoresistive force can be simply calculated based on the reaction force. By using the above mechanical combination movement mode, the magnetoresistive force and the force arm can be read in a relatively intuitive way during measurement and calculation, without the need for other estimation or indirect methods for calibration, which can reduce the generation of errors and further improve the reliability of power calculation.

[0024] The following invention content is merely illustrative and is not intended to be limiting in any way. That is, the following overview is provided to introduce the concepts and advantages of the non-obvious technologies described herein. Therefore, the following invention content neither aims to identify the essential features of the claimed subject matter nor aims to be used to determine the scope of the claimed subject matter. Brief Description of the Drawings

[0025] Figure 1 is a side view of a magnetoresistive exercise bike in the prior art;

[0026] Figure 2 is Figure 1 a schematic diagram of the displacement trajectory of the magnet group of the magnetoresistive exercise bike;

[0027] Figure 3 is a side view of a fitness equipment with a magnetoresistive device according to a preferred embodiment of the present invention;

[0028] Figure 4 is a partially enlarged movement schematic diagram of the magnetoresistive device according to a preferred embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the magnetic element relative to the annular frame in the first position of the present invention;

[0030] Figure 6 is a schematic diagram of the magnetic element relative to the annular frame in the second position of the present invention;

[0031] Figure 7 is a schematic diagram of the relationship between the magnetoresistive force and the reaction force of the present invention;

[0032] Figure 8 is a movement schematic diagram of the magnetoresistive device according to another preferred embodiment of the present invention;

[0033] Figure 9 is a movement schematic diagram of the magnetoresistive device according to still another preferred embodiment of the present invention. Detailed Description of the Embodiment

[0034] Please refer toFigures 3 to 7 As shown Figure 3 The side view of a fitness equipment with a magnetoresistive device according to a preferred embodiment of the present invention Figure 4 The partial enlarged operation schematic diagram of the magnetoresistive device according to a preferred embodiment of the present invention Figure 5 The schematic diagram of the magnetic element relative to the annular frame in the first position of the present invention Figure 6 The schematic diagram of the magnetic element relative to the annular frame in the second position of the present invention Figure 7 The schematic diagram of the magnetoresistive force and reaction force relationship of the present invention. A sports equipment with a magnetoresistive device provided by the present invention includes a frame body 10 and a metal disc 20. The frame body 10 has a shaft portion 11, a pedal crankset 12 and a transmission system 13. The metal disc 20 is pivotally arranged on the shaft portion 11 of the frame body 10. A base 14 is fixedly arranged on one side of the frame body 10 at a position adjacent to the metal disc 20, which can also be understood as extending from one side of the frame body 10 to form the base 14, and one side of the base 14 can form an inclination angle θ relative to the frame body 10. The above-mentioned sports equipment allows a user to drive the pedal crankset 12 in a stepping and rotating manner above the frame body 10, drive the metal disc 20 to rotate around the shaft portion 11 through the transmission system 13, and enable the user to simulate the exercise state of cycling indoors

[0035] The metal disc 20 defines a first side surface 21, a second side surface 22, a diameter direction 23 and an axis direction 24. The second side surface 22 protrudes outward along the axis direction 24 to form an annular frame 25 that can define an inner side surface 25a, an outer side surface 25b and a center line 25c. A circular metal inertia member 26 is arranged on the second side surface 22 of the metal disc 20. In this embodiment, the annular frame 25 is located at the periphery of the metal disc 20, the density of the metal inertia member 26 is greater than that of the metal disc 20, and the area of the metal inertia member 26 is smaller than that of the metal disc 20. In this embodiment, the material of the metal disc 20 is made of aluminum, and the metal inertia member 26 is made of cast iron. By the mass difference, sufficient rotational inertia can be generated when the metal disc 20 rotates, so that the pedal crankset 12 linked thereto can rotate smoothly and accelerate or decelerate smoothly, providing a better riding experience for the user

[0036] Please refer to Figures 4 to 6As shown, there is a support base 30 which has an adapter 31 and a bracket 32 fixedly provided with a magnetic element 32a. The adapter 31 can be disposed on one side of the base 14, and the entire support base 30 forms an inclination angle θ relative to the frame body 10. One side of the adapter 31 has a first rotating shaft 31a movably disposed on the base 14, and a second rotating shaft 31b perpendicular to the first rotating shaft 31a. The bracket 32 is pivotally provided on the second rotating shaft 31b of the adapter 31 in a reciprocally adjustable displacement manner, so that the magnetic element 32a can be displaced between a first position A and a second position B, that is, the magnetic element 32a can reciprocally adjust the displacement between the first position A and the second position B in a selectable manner with the second rotating shaft 31b as a rotation center. When the magnetic element 32a is located at the first position A, as Figure 5 shown, the magnetic element 32a is located outside the annular frame 25. When the magnetic element 32a is located at the second position B, as Figure 6 shown, the magnetic element 25a is located on the center line 25c of the annular frame 25, and the magnetic element 32a and the annular frame 25 can overlap each other. Among them, the displacement path between the first position A and the second position B is the same displacement plane O, and the displacement plane O can be perpendicular to the diameter direction 23. When the magnetic element 25a is displaced from the first position A to the second position B, a relative distance D can be maintained between the magnetic element 32a and the annular frame 25 along the diameter direction 23. In this embodiment, the magnetic element 32a has a shape of a round cake plane, and the magnetic element 32a having a non-round cake plane shape can also have a certain effect. When the magnetic element 32a approaches the annular frame 25, the surface normal of the side of the magnetic element 32a having a round cake plane shape is perpendicular to the axis direction, so that the magnetic lines of force of the magnetic element 32a are more effectively distributed on the surface of the moving object (for example, the annular frame 25 of the metal disk 20) to form a higher magnetic flux, and a better eddy current magnetoresistance effect can be generated by cutting the magnetic field. In the present invention, the shape of the magnetic element 32a is not limited to the round cake plane shape, and it can also be implemented in other shapes, and the magnetic flux can be changed through the shape design.

[0037] Please refer to Figure 7As shown, a force measuring sensor 40 is disposed between the adapter 31 and the frame body 10. When the metal disk 20 rotates, the magnetic element 32a is adjusted to displace from the first position A to the second position B, and a magnetic resistance acting force F in the tangential direction can be applied to the annular frame 25. At the same time, the bracket 32 can drive the adapter 31 to act on one end of the force measuring sensor 40, and the other end of the force measuring sensor 40 abuts against the frame body 10 to generate a reaction force E. Among them, the inclination angle θ can directly adjust the orientation of the overall structure of the support base 30 relative to the frame body 10, so that the acting direction of the reaction force E is perpendicular to the tangential direction of the magnetic resistance acting force F, and the axial direction of the second rotating shaft 31b is perpendicular to the tangential direction of the magnetic resistance acting force F. Then, the magnetic resistance acting force F can be directly calculated based on the reaction force E. In this embodiment, one end of the force measuring sensor 40 abuts against one end of the base 12, and the base 14 is fixed on one side of the frame body 20 adjacent to the metal disk 20. It can also be understood that the base 14 is formed by extending from the frame body 20. Therefore, it is equivalent to the force measuring sensor 40 abutting against the frame body 20.

[0038] Please refer to Figure 4 As shown, a reduction motor 50 is disposed on one side of the adapter 31, and the user can reciprocally displace the bracket 32 in an adjustable pitch manner. When the magnetic element 32a displaces from the first position A to the second position B, the magnetic element 32a projects onto the annular frame 25 along the diameter direction 23 to form a cutting magnetic field area H. When the magnetic element 32a is at the first position A, the cutting magnetic field area H is the minimum value, as Figure 5 shown, then the magnetic resistance acting force F is the minimum value. When the magnetic element 32a is at the second position B, the cutting magnetic field area H is the maximum value, as Figure 6 shown, then the magnetic resistance acting force F is the maximum value. By changing the size of the cutting magnetic field area H, the size of the magnetic resistance acting force F can be directly adjusted. Among them, a worm 51 is provided at one end of the reduction motor 50, and a tooth member 52 that can be engaged with the worm 51 is fixed on the other side of the bracket 32 relative to the magnetic element 32a. The tooth-shaped profile of the tooth member 52 is matched with the reciprocating displacement path to present an arc-shaped trajectory. The reduction motor 50 is controlled to rotate the worm 51 to act on the tooth member 52, and then transmitted to the bracket 32. The transmission relationship generated by the meshing of the worm 51 and the tooth member 52 is used to achieve the purpose of reciprocating displacement between the first position A and the second position B. The above technical means can be easily known by those with ordinary knowledge in the technical field to which the present invention belongs according to the prior art before the application, so it will not be elaborated here.

[0039] The above is an overview of the basic structure and the component assembly process of a preferred embodiment of the present invention, and the principle of the achieved effect is described as follows:

[0040] Please refer to Figures 4 to 6As shown, when the user is above the frame 10 and drives the pedal crankset 12 in a stepping and rotating manner, the metal disc 20 can be driven to rotate via the transmission system 13. The user can control the speed reduction motor 50 to adjust the resistance according to the resistance demand of their own motion state. For the mechanical action mechanism of adjusting the resistance size, if the user wants to increase the resistance, the speed reduction motor 50 is used to rotate the worm 51 to act on the tooth part 52, and then transmitted to the bracket 32, so that the magnetic element 32a takes the second rotating shaft 31b as a rotation center and gradually displaces from the first position A to the second position B, that is, the magnetic element 32a gradually approaches the center line 25c of the annular frame 25 from the outside of the annular frame 25. At this time, the magnetic field cutting area H will also gradually increase. Since the annular frame 25 is in a rotating state, it will cut the magnetic field generated by the magnetic element 32a to generate an eddy current magnetoresistance effect, and the magnetoresistance force F will also gradually increase with the increase of the magnetic field cutting area H; on the contrary, if the user wants to reduce the resistance, the speed reduction motor 50 can be controlled to reverse the worm 51 to act on the bracket 32, so that the magnetic element 32a takes the second rotating shaft 31b as a rotation center and gradually displaces from the first position B to the second position A. At this time, the magnetic field cutting area H will also gradually decrease, and the magnetoresistance force F will also gradually decrease with the decrease of the magnetic field cutting area H.

[0041] In this embodiment, when the base 14 is fixedly arranged on the frame 10, a design of generating an inclination angle θ on one side of the base 14 is further utilized, and at the same time, the whole support seat 30 generates a specific direction with an inclination angle θ relative to the frame 20. When the magnetoresistance force F is generated, since the first rotating shaft 31a is arranged on one side of the adapter 31, and the first rotating shaft 31a and the second rotating shaft 31b intersect and are perpendicular to each other, and the axial direction of the second rotating shaft 31b is perpendicular to the tangent direction of the magnetoresistance force F, and combined with the fact that the force direction of the reaction force E is perpendicular to the tangent direction of the magnetoresistance force F, the magnetoresistance force F can be transmitted to the adapter 31, and the magnetoresistance force F will act on the force measuring sensor 40 with the first rotating shaft 31a as a fulcrum, and the reaction force E directly read by the force measuring sensor 40 can be used to inversely infer the acting force generated by the magnetic element 32a due to the eddy current magnetoresistance effect.

[0042] For the rotating annular frame 25, the pedaling operation of a general exercise bike causes the annular frame 25 to rotate in a clockwise direction. The force formed by the magnetic element 32a to prevent the operation of the annular frame 25 is measured by the force sensor 40. Since a fixed value, i.e., the relative distance D, can be maintained between the magnetic element 32a and the annular frame 25, in the power calculation of fitness equipment, the perpendicular distance between the shaft portion 11 and the tangent direction of the force acting on the object's current motion can be defined as the value of a force arm R. In this torque relationship, the force arm R of the force acting on the magnetic element 32a is actually R + D, while the force arm R of the magnetoresistive force F acting on the annular frame 25 is R. Among them, to generate the eddy current magnetoresistive effect, an appropriate relative distance D must be designed between the magnetic element 32a and the annular frame 25. The relative distance D is quite small compared to the radius of the metal disk 20 and can be ignored, i.e., R + D ≈ R. Therefore, the power acting on the annular frame 25 is also equivalent to the power acting on the magnetic element 32a. In addition, the acting force and the reaction force formed by a resistance always appear in pairs, with the same magnitude and opposite directions. Therefore, when calculated by absolute value, the acting force of the magnetic element 32a is equivalent to the reaction force applied to the annular frame 25, which means the magnetoresistive force F acting on the annular frame 25 defined in the present invention can also be measured by the force sensor 40.

[0043] For the fixed values of the lever arm R and the relative spacing D, a further explanation is made. The tangential direction of the magnetoresistive force F intersects the annular frame 25 at a tangent point (not marked). This tangent point is the position where the annular frame 25 generates the magnetoresistive force F. During the process of displacement from the first position A to the second position B, it undergoes displacement along an arc trajectory with the second rotating shaft 31b as the center of rotation. When the magnetic element 32b moves into the projection range of the annular frame 25 in the diameter direction, that is, when the magnetic element 32 starts to overlap with the annular frame 25, the magnetoresistive force F begins to be generated. The perpendicular distance between this tangent point at this moment and the side surface of the magnetic element 32b facing the tangent point is the relative spacing D. Among them, along the axial direction 24 as a side view angle, it can be understood that the displacement path of the magnetic element 32b between the first position A and the second position B is above the displacement plane O, and the displacement plane O can be perpendicular to the diameter direction 23, so that the lever arm R and the relative spacing D will not change during the process of the magnetic element 32b displacing from the first position A to the second position B, that is, the lever arm R and the relative spacing D can be kept as fixed values, and the present invention is classified as a magnetoresistive device with a fixed lever arm. In addition, since the relative spacing D is a fixed distance, one of the variables affecting the magnitude of the magnetic flux can be removed, so that the magnetic flux generated by the magnetic element 32b acting on the annular frame 25 is directly positively correlated with the magnetic field cutting area H, and the amount of magnetic flux also determines the magnitude of the magnetoresistive force F, that is, the magnetic field cutting area H and the magnetoresistive force F are also positively correlated. Therefore, the relative spacing D can be designed as an appropriate fixed distance to avoid unexpected changes during the generation of the magnetoresistive force F, so that the present invention has the advantages of a magnetoresistive device with a variable lever arm.

[0044] In this embodiment, the annular frame 25 is designed to be located at the periphery of the metal disk 20. When the magnetic element 32a acts on the annular frame 25 to generate the magnetoresistive force F, the length of the lever arm R can be defined as the perpendicular distance between the shaft portion 11 and the tangential direction of the magnetoresistive force F, that is, the radius of the metal disk 20, which can be directly measured as a fixed value. It can be seen that the length of the lever arm R can be directly determined by the selected position of the annular frame 24 on the metal disk 20. The main spirit of the design of the present invention is to fix the lever arm R during the operation of the magnetoresistive device, so as to effectively calculate the power value, rather than limiting the length of the lever arm R. Moreover, the length of the lever arm R can also be adjusted arbitrarily according to the design requirements of different magnetoresistive devices. In order to simplify the calculation of power, the radius of the metal disk 20 is used as the fixed value of the length of the lever arm R. During the operation of the present invention, the magnetic element 32a moves away from or approaches the rotating annular frame 25 in a swinging manner close to the axial displacement from the outside of the annular frame 25, so that the lever arm R will not change due to the displacement of the magnetic element 32a. At the same time, the size of the magnetic field cutting area H can be adjusted arbitrarily. Through the above structural design, the acquisition method of the lever arm R in the power parameters can be simplified, and unexpected variables can be reduced to improve the accuracy of power calculation.

[0045] Please refer to Figure 7 As shown, in this embodiment, through the design of the base 12, the support base 30 as a whole has an inclination angle θ relative to the frame body 20. The adapter 31, the bracket 32 and the base 14 are pivotally connected and fixed to each other in a movable manner, and the above structure must cooperate with the tangential direction of the magnetoresistive force F generated, thus forming a mathematical relationship between the magnetoresistive force F and the reaction force E that can be directly simplified for calculation.

[0046] According to the power calculation formula P = Τ×ω, P = (F×R)×ω, it mainly reads three parameters: the magnetoresistive force F, the lever arm R, and the angular velocity ω. According to the mathematical relationship between the magnetoresistive force F and the reaction force E formed by the structure of the mechanical connection, F = E×(L2 / L1); the perpendicular distance between the axis direction of the first rotating shaft 31a and the tangential direction of the magnetoresistive force F is L1, and the perpendicular distance between the axis direction of the first rotating shaft 31a and the force receiving point of the force measuring sensor 40 is L2; with the above inventive structure, it can be known that the magnetoresistive force F is located in the tangential direction of the periphery of the metal disk 20. For the shaft portion 11, the length of the lever arm R is the radius of the metal disk 20. Thus, the torque Τ acting on the annular frame 25 is obtained. A Hall sensor and a magnetic body (not shown in the figure) are respectively provided on the frame body 20 and the pedal crank group 12. By driving the magnetic body to rotate in a circle by the pedal crank group 12, the number of turns can be calculated by passing through the Hall sensor along the way, and thus the angular velocity ω of the annular frame 25 can be obtained to calculate the power of the rotation of the annular frame 25; among them, L1, L2, and R are all fixed values; E and ω are measured values.

[0047] In addition, since the force measuring sensor 40 is clamped between the adapter 31 and the frame body 10, and there must be a relationship allowing for a slight amount of spatial variation between these mechanisms for measuring the reaction force E, a deformable first elastic member 60 is clamped between the adapter 31 and the frame body 10. The force measuring sensor 40 can abut between the adapter 31 and the frame body 10 to form a preloaded state. The main function of the first elastic member 60 is to prevent shaking from affecting the measurement accuracy of the reaction force E. The selection criterion for the spring constant K value of the first elastic member 60 is mainly to prevent the force measuring sensor 40 from being affected by the deformation restoring force of the first elastic member 60 during the compression process. If the K value is too large, the force measuring sensor 40 will erroneously feed back the restoring force of the first elastic member 60 as the reaction force, resulting in an error. If the K value is too small, the force measuring sensor 40 will not be able to abut between the frame body 10 and the adapter 31. The so-called preloaded state is to select a first elastic member 60 with a suitable K value according to the weight of the support base 30, so that the force measuring sensor 40 abuts between the frame body 10 and the adapter 31 without exerting too much pressure on the frame body 10, mainly to avoid being affected by the restoring force of the first elastic member 60 and affecting the prediction linear accuracy. In this embodiment, the K value of the first elastic member 60 can be between 0.19 N / mm and 0.21 N / mm.

[0048] In addition, during the process where the magnetic element 32a can reciprocally adjust its displacement between the first position A and the second position B, it is mainly controlled by the user to rotate the worm 51 of the reduction motor 50 to act on the tooth member 52 to achieve the purpose of adjusting the pitch. There will inevitably be a gap between the worm 51 and the tooth member 52, resulting in slight shaking, which will affect the stability of the movement of the magnetic element 32a located on the bracket 32. In addition, the magnetic element 32a will also cause the bracket 32 to shake slightly under the influence of the magnetic resistance force F. In this embodiment, to overcome the above-mentioned shaking problem, a deformable second elastic member 70 can be provided at one end of the bracket 32. One end of the second elastic member 70 is connected to one end of the adapter 31, and the stretching direction of the second elastic member 70 is perpendicular to the axis direction of the second rotating shaft 31b, and the stretching direction of the second elastic member 70 is set in the same plane as the displacement plane. Thus, the backlash of the reduction motor 50, the worm, and the tooth member 52 and the shaking caused by the stable magnetic resistance force F can be eliminated.

[0049] Please refer to Figure 8 as shown Figure 8Schematic diagram of the operation of the magnetoresistive device according to another preferred embodiment of the present invention. In this embodiment, the number of magnetic elements 32a is set to 2, and the support base 30 further has an auxiliary support bracket 32' symmetrically arranged with the bracket 32. The two magnetic elements 32a are respectively fixed to the inner surfaces of the bracket 32 and the auxiliary support bracket 32' in a pairwise symmetric manner. At the first position A, the two magnetic elements 32a are located outside the annular frame 25. At the second position B, the two magnetic elements 32a are located on the center line 25c of the annular frame 25. The magnetic element 32a and the annular frame 25 overlap each other, and the two magnetic elements 32a can maintain a relative distance D along the diameter direction 23 between the inner side surface 25a and the outer side surface 25b respectively; at this time, the distance between the two magnetic elements 32a located on the bracket 32 and the auxiliary support bracket 32' respectively should be set to the thickness of the annular frame 25 plus twice the relative distance D. Then, by adopting an appropriate and fixed relative distance D, that is, in the case of generating a magnetoresistive force F, it is possible to avoid excessive magnetic attraction forces generated by the two magnetic elements 32a correspondingly. And in this pairwise symmetric manner, the magnetic field line distribution generated can obtain more magnetic fluxes and can also achieve a better magnetoresistive effect.

[0050] In the above-mentioned another preferred embodiment, the number of magnetic elements 32a is set to 2, and an even number of more than 2 can also be used, such as 2, 4, 6, 8, 10... and so on. By analogy, the main idea is to fix each magnetic element 32a to the inner surfaces of the bracket 32 and the auxiliary support bracket 32' in a pairwise symmetric manner. When the annular frame 25 passes by quickly, a better magnetoresistive effect can also be obtained between the magnetic elements 32a; among them, since the single or double number configuration of the magnetic elements 32a will determine whether there is a pairwise symmetric relationship and will also affect how the magnetic field lines of the magnetic field are distributed on the annular frame 25, the resistance intensity of the magnetic elements 32a arranged in a single number and the resistance intensity of the magnetic elements 32a arranged in a double number cannot be defined by a simple integer multiple relationship.

[0051] In addition, the magnetic elements 32a arranged in a pairwise symmetric manner can respectively project along the diameter direction 23 onto the outer side surface 25a and the inner side surface 25b to form a cutting magnetic field area H of overlapping projections. Here, the cutting magnetic field area H of the overlapping projections can be defined as 1 resistance unit. For example, when the number of magnetic elements 32a is set to 4, the cutting magnetic field area H of the overlapping projections here can be defined as 2 resistance units, and so on. And the above-mentioned resistance units can be used as parameters for adjusting the instantaneous resistance size when designing sports equipment in the way of cumulative summation. The so-called instantaneous resistance refers to the magnetoresistive force formed by controlling a displacement unit. The magnetoresistive force F and the cumulative sum of the cutting magnetic field areas H of the overlapping projections belong to a positive correlation relationship. Therefore, the resistance intensity of the magnetic elements 32a arranged in a double number symmetrically can show a linear positive relationship.

[0052] Please refer to Figure 9 as shown inFigure 9 This is a schematic diagram of the operation of the magnetoresistive device according to another preferred embodiment of the present invention. In this embodiment, a guiding block 31c is extended and provided on one side of the adapter 31, and a limiting track 32b for the guiding block 31c to slide is provided on one side of the bracket 32. The outer shape of the toothed member 52 fixedly provided on the other side of the bracket 32 is designed to be linear in cooperation with the limiting track 32b, and the track direction of the limiting track 32b is parallel to the axial direction 24. At the same time, the extending direction of the guiding block 31c is perpendicular to the tangent direction of the magnetoresistive force F. Thus, the user can control the reduction motor 50 to rotate the worm 51 to act on the toothed member 52, and then transmit it to the bracket 32, so that the magnetic element 32a reciprocates between the first position A and the second position B along the axial direction 24 in a linear trajectory. When the magnetoresistive force F is generated, both the force arm R and the relative distance D are fixed values. The structural combination method can also use the inclination angle θ to make the overall structure of the support base 30 cooperate with the direction of the magnetoresistive force F. The method of directly calculating the magnetoresistive force F based on the moment relationship of the reaction force E is the same as that of the above other embodiments. The result can also simplify the measurement calculation, improve the accuracy and reliability, reduce the production of high-precision mechanisms and components, and thus achieve another embodiment with the same main creative spirit as the present invention. In addition, this embodiment can also be combined with the technical features of another embodiment to form two symmetric magnetic elements 32a. When it can be implemented to enter and exit the annular frame 25 along the axial direction 24 in a linear trajectory, more magnetic fluxes can be obtained in the magnetic field line distribution generated, and a better magnetoresistive effect can be achieved.

[0053] In summary, the design of the present invention is a sports equipment with a magnetoresistive device. The magnetic element 32a is mainly moved away from or close to the rotating annular frame 25 in a manner close to the axial displacement from the outside of the annular frame 25, so that the length of the force arm R can be designed as a fixed value. The force arm R can be defined by the design position of the annular frame 25. In this embodiment, the radius of the metal disc 20 is used as the force arm R to simplify the reading. The present invention changes the acquisition method of the force arm R in the power parameters. Compared with the magnetoresistive devices used in the prior art, without installing a position sensor, the variable force arm R to be obtained can be converted into a fixed value, directly eliminating the loss problem of the long-term use of the position sensor, directly avoiding the error variables, and further improving the accuracy of the data display power. In addition, by using the design of the inclination angle θ, the overall support base 30 can be made to cooperate with the direction of the magnetoresistive force F during the operation process, so that the force direction of the reaction force E is perpendicular to the tangent direction of the magnetoresistive force F. Then, the magnetoresistive force F can be calculated based on the reaction force E. According to the above structure, a more intuitive method can be used to measure the magnetoresistive force F and the force arm R, without the need to correct through other estimation or indirect methods, so as to improve the reliability of the power calculation.

[0054] The present invention particularly reiterates that the main innovative spiritual content is to innovate a new structure, mainly designing the structure of a magnetoresistive device with a fixed force arm based on the torque relationship. Compared with the prior art, during the process of adjusting the resistance, it mainly adopts a different direction to enter and exit the annular frame 25. At the same time, an appropriate fixed relative distance D can also be maintained between the magnetic element 32a and the annular frame 25. Even when the magnetic elements 32a are arranged in a pairwise symmetric manner, the factor of magnetic attraction can be ignored, enabling the magnetoresistive device with a fixed force arm of the present invention to have the advantages of the magnetoresistive device with a variable force arm in the prior art, and greatly improving the economic consideration, practicability and durability of fitness equipment.

Claims

1. A sports equipment with a magnetic resistance device, comprising: a base; A metal plate, which is pivotally mounted on the shaft of the frame, is driven to rotate by a user, and is defined with a first side surface, a second side surface, a diameter direction, and an axial direction; Features: The metal plate has an annular frame protruding outward from the second side surface along the axial direction; A support seat, which has an adapter and a bracket with a magnetic element fixed thereon, the adapter is arranged at a position of the frame adjacent to the metal disk, and the bracket is arranged on the adapter in a manner that can reciprocate and adjust the displacement so that the magnetic element can be displaced between a first position and a second position, when in the first position, the magnetic element is located on the outside of the annular frame, and when in the second position, the magnetic element is located on a center line of the annular frame, wherein the displacement path between the first position and the second position is the same as a displacement plane, and the displacement plane can be perpendicular to the diameter direction, and when the magnetic element is displaced from the first position to the second position, the magnetic element overlaps with the annular frame and a relative spacing can be maintained between the magnetic element and the annular frame along the diameter direction; A force sensor is arranged between the adapter and the frame. When the metal disk rotates, the magnetic element is adjusted to move from the first position to the second position to apply a magnetic resistance force to a tangent direction of the annular frame. At the same time, the bracket can link the adapter to act on one side of the force sensor, and the other side of the force sensor presses against the frame to generate a reaction force. The reaction force is used to convert the magnetic resistance force.

2. The sports equipment with a magnetic resistance device as claimed in claim 1, characterized in that: The annular frame is located at the periphery of the metal disk, and the vertical distance between the shaft and the tangent direction of the magnetic resistance force is the radius of the metal disk.

3. The sports equipment with a magnetic resistance device according to claim 1, characterized in that: One side of the adapter is provided with a first rotating shaft that can be movably set on the frame, and a second rotating shaft that is perpendicular to the first rotating shaft, and the bracket can be pivoted on the second rotating shaft, so that the magnetic element can reciprocate and adjust its displacement between the first position and the second position with the second rotating shaft as a rotation center.

4. The sports equipment with a magnetic resistance device according to claim 1, characterized in that: A base adjacent to the metal disk is fixedly provided on one side of the frame, and the adapter can be arranged on one side of the base to make the support seat form an inclined angle relative to the frame. When the magnetic resistance force is generated, the force direction of the reaction force is perpendicular to the tangent direction of the magnetic resistance force.

5. The sports equipment with a magnetic resistance device as claimed in claim 1, characterized in that: A reduction motor is provided at one end of the bracket, and the user can move the bracket back and forth in an adjustable step manner. When the magnetic element moves from the first position to the second position, the magnetic element is projected onto the annular frame along the diameter direction to form a cutting magnetic field area. When the magnetic element is located at the first position, the cutting magnetic field area is minimum, and the magnetic resistance force is minimum. When the magnetic element is located at the second position, the cutting magnetic field area is maximum, and the magnetic resistance force is maximum.

6. The sports equipment with a magnetic resistance device according to claim 1, characterized in that: The magnetic element has a circular flat surface, and a surface normal of a side surface of the magnetic element can be perpendicular to the axial direction.

7. The sports equipment with a magnetic resistance device according to claim 1, characterized in that: A deformable first elastic member is sandwiched between the adapter and the frame, and can provide the force sensor with a pre-stressed state.

8. The sports equipment with magnetic resistance device as claimed in claim 3, characterized in that: A deformable second elastic member is disposed at one end of the bracket, and a stretching direction of the second elastic member is disposed in the same plane as the displacement plane.

9. The sports equipment with a magnetic resistance device according to claim 1, characterized in that: The bracket has a bracket and an auxiliary bracket symmetrically arranged with the bracket, and the number of the magnetic elements is more than two, and they are fixed on the inner surfaces of the bracket and the auxiliary bracket in a symmetrical manner of two by two. When each of the magnetic elements is displaced to the second position, each of the magnetic elements can be adjacent to an inner side surface and an outer side surface of the annular frame respectively, and each of the magnetic elements can maintain the relative distance with the outer side surface and the inner side surface along the diameter direction.

10. The sports equipment with a magnetic resistance device according to claim 1, characterized in that: A guide block is provided on one side of the adapter, and a limiting track is provided on one side of the bracket for the guide block to slide on, and the track direction of the limiting track is parallel to the axial direction, so that the magnetic element can reciprocate and adjust the displacement between the first position and the second position along the axial direction.

Images