Torsion sensor device of resistance system

Abstract

The invention discloses a torsion sensor device of a resistance system, which is characterized in that a torsion sensor is arranged on a support frame of the resistance system and on a straight line of a flywheel axis and a coil magnetic resistance mechanism, and a resistance strain gauge on the torsion sensor can generate different resistance value changes according to the deformation of a strain block; and the resistance value change is used as a magnetic force detection device, and the obtained magnetic force data is used for compensating and correcting the output current, so that the closed-loop system has the effects of improving the resistance control accuracy of the resistance system, enabling the resistance control to be more accurate and meeting the high-order equipment requirement. Furthermore, a torsion sensor and a coil magnetic resistance mechanism for generating resistance (tension) are constructed in a mechanism of the same resistance system, so that the benefit of simplifying the whole structure is achieved.

Description

Technical Field

[0001] This invention relates to a torque sensor device for a resistance system, and more particularly to a torque sensor device that uses the change in its resistance value as a magnetic force detection device, and uses the obtained magnetic force data as a means to compensate and correct the output current. Background Technology

[0002] Resistance (tension) control is used in many places, such as resistance systems in fitness equipment, resistance control in medical rehabilitation equipment, and even tension control in commercial or industrial equipment, with a wide range of applications.

[0003] like Figure 1 As shown, it discloses a commonly used electromagnetic resistance system 10A, which includes a flywheel 11 mounted on a support frame 13 with its axis 12, and one or more coils 14 on the side of the flywheel 11. When current flows through the coils 14, a magnetic field is generated. Due to the magnetic permeability of the surface material of the flywheel 11, a magnetic circuit is formed between the coil core and the flywheel 11 when the coils 14 are energized. When the flywheel 11 rotates, Lenz's law is used to generate a rotational resistance of the same magnitude and opposite to the direction of rotation.

[0004] like Figure 2 As shown, it discloses a widely used self-generating resistance system 10B, which has a similar architecture to the electromagnetic resistance system 10A described above. The difference is that the coil 14 of the electromagnetic resistance system 10A requires an external power source, while the self-generating resistance system 10B has a generator 15 installed in its flywheel 11. It can generate electricity through the rotation of the flywheel 11, thereby providing the power required by the coil 14 to generate resistance.

[0005] The two resistance (tension) systems mentioned above, 10A and 10B, are both mature products based on prior art technology (2k7), so their principles and features will not be elaborated upon. This type of resistance (tension) system has been seen in: Chinese Announcement CN201204540 "Hybrid Generator with Built-in Eddy Current Reluctance", Taiwan Announcement M420342 "Self-generated Resistance Device for Fitness and Rehabilitation Equipment", and US Patent No. 6,084,325 "Brake Device with Acombination of Power-Generating and Eddy-Current Magnetic Resistance", etc. The above-mentioned resistance (tension) system controls the magnitude of the generated magnetic force (current x number of coils = magnetic force) by controlling the magnitude of the current in the input coil 14, which is the magnitude of the resistance or tension.

[0006] like Figure 3 As shown, without a measuring sensor as feedback, it is difficult to achieve precise control of magnetic force (i.e., resistance or tension). The general control method is to measure the resistance curve of the device before the resistance system is completed. This includes parameters such as current, speed and power, forming a power table. When we need to control its resistance, we can first find the current speed of the device, look up the current required for the required resistance (tension) at the corresponding speed, and then control the resistance (tension) system 10A or 10B by controlling the current to generate the corresponding resistance (tension).

[0007] Therefore, we can see that this is an "open-loop system," lacking feedback and compensation to correct the result. Furthermore, in the resistance system 10A or 10B, numerous factors influence the magnitude of the magnetic force during resistance generation. These include the duration of operation, the temperature of the flywheel and coil, and the size of the gap between the flywheel and the iron core. Because these factors affect the strength of the magnetic field lines, the magnitude of magnetic reluctance, and the coil resistance, the final resistance will deviate significantly from the required data.

[0008] To improve this deviation, one more effective method is to change the above process into a "closed-loop system" with a feedback device. This feedback is directly based on the magnitude of the magnetic force, which should be a more effective method. This closed-loop system can continuously feed back the measured magnetic force to the control system and compare it with the set magnetic force magnitude. If there is a deviation, the supplied current can be adjusted at any time to meet the set requirements.

[0009] Therefore, there is an urgent need to design a torque sensor device for a resistance system to solve the problems mentioned above. Summary of the Invention

[0010] The purpose of this invention is to provide a torque sensor device for a resistance system, which improves the accuracy of the resistance system in controlling the magnitude of resistance, making the resistance control more precise and achieving the effect required for high-level equipment.

[0011] Another objective of this invention is to provide a torque sensor device for a resistance system, which has a precise resistance (tension) control method and integrates the torque sensor and the resistance (tension) generator into the same mechanism, thereby simplifying the overall structure. To achieve the above objectives, the technical means employed in this invention lies in a resistance system, comprising a support frame having left and right plates assembled into a single unit by a plurality of positioning rods, wherein the left and right plates are provided with shaft holes at opposite positions; a flywheel having a shaft, pivotally mounted on the shaft hole via left and right bearings and bearing seats, allowing the flywheel to rotate on the support frame; and a coil magnetic reluctance mechanism located on one side of the outer periphery of the flywheel, for providing a magnetic force to the flywheel, wherein the magnetic force is proportional to the applied current; characterized in that: The bearing housing has a first ring body with a positioning groove on its outer periphery, and a second ring body with a larger outer diameter on its inner side. The shaft holes of the left and right plates are non-circular elliptical holes with elongated grooves, allowing the first ring body of the bearing housing to be fitted onto the shaft hole from the inside out. The second ring body serves as the positioning surface on the inner side, and a positioning element is fitted onto the groove on the outer side. This allows the bearing housing to be floated on the shaft hole without being rigidly connected to it. A torque sensor, including a strain gauge, is installed in the elongated groove on the side of the shaft hole, and must be aligned with the axis of the flywheel and the center of the coil magnetoresistive mechanism. The top of the strain gauge extends inward to form a transverse protrusion plate, the top surface of which is designed to contact the second ring body of the bearing housing. A resistance strain gauge is provided on the bottom edge of the opposite side of the protrusion plate. The strain gauge and its connecting wires, the resistance strain gauge will produce different resistance value changes according to the amount of deformation of the strain block; and a control circuit, which receives the resistance value change of the torque sensor, calculates the change of the resistance, and compares the difference between the required resistance and the actual resistance to adjust the magnitude of the applied force so that the required resistance matches the actual resistance.

[0012] Furthermore, when the first ring of the bearing housing is fitted into the shaft hole, a movable gap is formed between the shaft hole and the long groove, allowing the bearing housing to move in the direction of the strain block.

[0013] Furthermore, the protruding plate at the top of the strain gauge has a free end without any fixing, giving it the elasticity to deform.

[0014] Furthermore, the positioning element includes a snap ring or positioning ring for fitting onto the annular groove to position the bearing housing on the shaft hole.

[0015] Furthermore, the flywheel's shaft is locked at one end with a first nut and a first screw, and a pulley is fitted at the other end with a second nut and a second screw. Based on the aforementioned features, the torque sensor is locked to the left and right plates by a third screw.

[0016] By employing the above-mentioned technical means, the present invention achieves the following enhanced effects: The present invention utilizes a torque sensor installed in a straight line between the flywheel shaft and the coil reluctance mechanism. The change in resistance value is used as a magnetic force detection device, and the obtained magnetic force data is used to compensate and correct the output current. This improves the accuracy of the resistance system in controlling the magnitude of resistance, making resistance control more precise and achieving the effect required for high-end equipment.

[0017] The present invention integrates the torque sensor and the coil magnetoresistive mechanism that generates resistance (tension) into the same resistance system, which has the benefit of simplifying the overall structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a commonly used electromagnetic resistance system; Figure 2 This is a schematic diagram of a commonly used self-generating resistance system; Figure 3 This is a schematic diagram of the resistance control process of a commonly used open-loop system; Figure 4 This is an exploded perspective view of the present invention; Figure 5 This is an enlarged schematic diagram of the right plate of the support frame of the present invention; Figure 6 This is a perspective view of the torque sensor of the present invention; Figure 7 This is another perspective view of the torque sensor of the present invention; Figure 8 This is a right-side perspective view of the present invention. Figure 9 This is a left-side perspective view of the present invention; Figure 10 This is an exploded perspective view of the bearing housing and torque sensor of the present invention. Figure 11 This is a perspective view of the combination of the bearing housing and the torque sensor of the present invention; Figure 12 This is a side view of the present invention; Figure 13 yes Figure 12 Enlarged sectional view of part of the structure; Figure 14 This is a schematic diagram of the resistance control process of the closed-loop system of the present invention; Figure 15 This is a schematic diagram for reference regarding the usage state of the present invention. Figure 1 ; Figure 16 This is a schematic diagram for reference regarding the usage state of the present invention. Figure 4 .

[0019] Explanation of markings in the diagram: 20. Support frame; 20L Left Plate Body; 20R right plate body; 21 Shaft hole; 24. Positioning rod; 30. Flywheel; 31. Axis; 32 bearings; 33 First nut; 34 First screw; 35. Belt pulley; 36 Second nut; 37. Second screw; 40 Coil reluctance mechanism; 41. Iron will; 42 coils; 50 Bearing housing; 60 Torque sensor; 65 Third screw; 70. Resistance system. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0022] The following reference Figures 4 to 14 The present invention describes a torque sensor device for a resistance system. Basically, the resistance system proposed in this invention, whether it is an "electromagnetic system" or a "self-generated system", are basically the same in terms of the structural part of implementing the magnetic feedback strain gauge, even though the two resistance systems are different in that they obtain current: one is an external power source and the other uses self-generated power. Therefore, the following embodiments only describe the structure of the electromagnetic resistance system.

[0023] The present invention provides a resistance system 70 comprising: a support frame 20 having left and right plates 20L and 20R, which are assembled into a single unit by a plurality of positioning rods 24, wherein the left and right plates 20L and 20R are provided with a shaft hole 21 at a relative position; and a flywheel 30 having a shaft 31, which is pivotally mounted on the shaft hole 21 by two bearings 32 on the left and right sides and a bearing seat 50, so that the flywheel 30 can rotate on the support frame 20; in this embodiment, one end of the shaft 31 of the flywheel 30 is locked with a first nut 33 and a first screw 34, and the other end is fitted with a pulley 35, which is locked with a second nut 36 and a second screw 37. A coil reluctance mechanism 40 is disposed on one side of the outer periphery of the flywheel 30 to provide a magnetic force to the flywheel 30, the magnetic force being proportional to the applied current; in this embodiment, the coil reluctance mechanism 40 comprises an iron core 41 and a coil 42 wound thereon. The above configuration belongs to prior art and is not the subject of this invention patent, and will not be described in detail.

[0024] The main feature of the present invention is that the bearing housing 50 has a first ring body 51, a positioning annular groove 511 is provided on the outer periphery of the first ring body 51, and a second ring body 52 with a larger outer diameter is provided on the inner side of the first ring body 51; in this embodiment, the outer diameter of the second ring body 52 needs to be larger than the shaft hole 21.

[0025] The shaft holes 21 of the left and right plates 20L and 20R are non-circular elliptical holes with a long groove 23. The first ring 51 of the bearing seat 50 is fitted onto the shaft hole 21 from the inside out. The inner side uses the second ring 52 as a positioning surface, and the outer side uses a positioning element 53 fitted onto the annular groove 511. This allows the bearing seat 50 to float on the shaft hole 21 without being rigidly connected to it. In this embodiment, the positioning element 53 includes a snap ring or positioning ring, which is fitted onto the annular groove 511 to position the bearing seat 50 on the shaft hole 21.

[0026] like Figure 5 As shown, this diagram displays an enlarged view of the right plate 20R of the support frame 20. In a preferred embodiment, when the first ring 51 of the bearing seat 50 is fitted into the shaft hole 21, a movable gap 22 is formed between the shaft hole 21 and the elongated groove 23, allowing the bearing seat 50 to move in the direction of the strain block 61. The dotted line A indicates a perfect circle, which is the position of the first ring 51. However, the shaft hole 21 of this invention is not a perfect circle, but rather the shape indicated by point B, leaving a movable gap 22, allowing the bearing seat 50 to move its position when the applied pressure (P) changes. It can adjust its movement according to pressure changes as the applied pressure (P) changes, such as... Figure 12 and Figure 13 As shown.

[0027] A torque sensor 60, such as Figure 6 and Figure 7 As shown, it includes a strain gauge 61, which is installed in the elongated groove 23 on the side of the shaft hole 21, and needs to be as follows: Figure 12 and Figure 13 As shown, the axis 31 of the flywheel 30 and the center of the coil reluctance mechanism 40 are on the same straight line (XX axis), and the top of the strain block 61 extends inward to form a transverse protrusion plate 62. The top surface 621 of the protrusion plate is configured to contact the second ring 52 of the bearing seat 50, and the bottom edge 622 on the opposite side of the protrusion plate 62 is provided with a resistance strain gauge 63 and its connecting wire 64. The resistance strain gauge 63 will produce different resistance values ​​according to the deformation of the strain block 61.

[0028] In this embodiment, the torque sensor 60 is locked to the left and right plates 20L and 20R by a third screw 65. Figure 10 and Figure 11 As shown, the protruding plate 62 at the top of the strain gauge 61 has a free end without any fixing, giving it elasticity to deform. The protruding plate 62 is suspended in the air and contacts the outer periphery of the second ring 52, bearing its pressure (P).

[0029] In this embodiment, the larger the current in the coil reluctance mechanism 40, the stronger the magnetic force; the smaller the current, the weaker the magnetic force. The magnetic force generated by the coil reluctance mechanism 40 forms a magnetic circuit with the flywheel 30, which is made of magnetically conductive material, thereby attracting the flywheel 30. When the flywheel 30 is subjected to magnetic force, since it is floating and fixed on the support frame 20, it will move towards the coil reluctance mechanism 40, causing the strain gauge 61 to be subjected to pressure and deform, which in turn causes a change in the resistance of the strain gauge 63. The greater the magnetic force on the flywheel 30, the greater the deformation of the strain gauge 61. Conversely, the smaller the magnetic force on the flywheel 30, the smaller the pressure on the strain gauge 61, and the smaller the deformation.

[0030] A control circuit 80 receives the resistance change of the torque sensor 60, calculates the change in resistance, and compares the difference between the required resistance and the actual resistance to adjust the applied force so that the required resistance matches the actual resistance.

[0031] like Figure 14 As shown, it discloses a schematic diagram of the resistance control process of the "closed-loop system" of the present invention, the steps of which include: S1: Input the required resistance (tension); S2: Compare the required resistance with the actual resistance; S3: Calculate the required current, and adjust the control circuit 80 according to the change in resistance value 81, thereby changing the magnetic force of the coil reluctance mechanism 40; S4: Generates corresponding resistance; S5: Measure the actual resistance, then return to S2: Compare the required resistance with the actual resistance; According to the aforementioned "closed-loop system", feedback is used to compensate and correct the result. To form such a closed-loop system, the technical means of the present invention is to use the torque sensor 60, which uses the change in resistance value as a magnetic force detection device, and uses the obtained magnetic force data as a means to compensate and correct the output current. In this way, the many effects that affect resistance (tension) mentioned above can be reduced to a minimum.

[0032] Figure 15 This is a schematic diagram illustrating the usage state of the present invention, showing the application of the resistance system 70 on the fitness and rehabilitation equipment 90. The pulley 35 connects the system to the fitness and rehabilitation equipment 90, and the control circuit 80 can be housed within the instrument panel. In fitness equipment and medical rehabilitation equipment, high-end fitness equipment, especially professional training equipment, has stringent requirements for the accuracy of training data. Trainees need to set and execute detailed training plans and obtain accurate training performance feedback as verification of results and as a basis for developing retraining plans. Therefore, accurate data acquisition and execution are crucial. The resistance system 70 of the "closed-loop system" of this invention, combined with the control circuit 80, effectively enables more precise resistance control, achieving the performance requirements of high-end equipment.

[0033] Figure 16 This is another schematic diagram illustrating the application of the resistance system 70 in a tensioning device 100. The pulley 35 connects the system to the tensioning device 100, and the control circuit 80 can be located around the tensioning device 100. For devices requiring strict tension control, the resistance system 70 of this invention, combined with the control circuit 80, features a resistance value change feedback device 81 and can adjust the output current 82, forming a closed-loop controlled braking system. This better meets the required control needs, and this embodiment effectively achieves the required functional characteristics within such requirements.

[0034] By employing the aforementioned technical means, this invention achieves the following improvements: The present invention utilizes a torque sensor 60 located in a straight line between the flywheel shaft 31 and the coil reluctance mechanism 40. The torque sensor 60 uses the change in resistance value as a magnetic force detection device, and uses the obtained magnetic force data to compensate and correct the output current. This improves the accuracy of the resistance system 70 in controlling the magnitude of the resistance, making the resistance control more precise and achieving the effect required for high-end equipment.

[0035] Second, the present invention integrates the torque sensor 60 and the coil magnetoresistive mechanism 40 that generates resistance (tension) within the same resistance system 70, which has the benefit of simplifying the overall structure.

[0036] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A torque sensor device for a resistance system, characterized in that, include, A support frame has left and right plates, which are assembled into a whole by a plurality of positioning rods, and the left and right plates are provided with a shaft hole at a relative position; A flywheel has a shaft and is pivotally mounted on the shaft hole via two bearings (left and right) and bearing seats, allowing the flywheel to rotate on the support frame; A coil reluctance mechanism is located on one side of the outer periphery of the flywheel to provide a magnetic force to the flywheel, and the magnetic force is proportional to the applied current; Its features are: The bearing housing has a first ring body, a positioning groove on the outer periphery of the first ring body, and a second ring body with a larger outer diameter on the inner side of the first ring body; The shaft holes of the left and right plates are non-circular elliptical holes with a long groove, so that the first ring of the bearing seat can be fitted onto the shaft hole from the inside out. The second ring serves as the positioning surface on the inner side, and a positioning element is fitted onto the annular groove on the outer side. In this way, the bearing seat is not rigidly connected to the shaft hole, but is floating on the shaft hole. A torque sensor includes a strain gauge mounted in a long slot on the side of the shaft hole, aligned with the axis of the flywheel and the center of the coil reluctance mechanism. The strain gauge extends inward from its top to form a transverse protrusion. The top surface of the protrusion is configured to contact the second ring of the bearing housing. A strain gauge and its connecting wires are provided on the bottom edge of the opposite side of the protrusion. The strain gauge changes its resistance value according to the magnitude of the strain gauge deformation. A control circuit receives the resistance change of the torque sensor, calculates the change in resistance, and compares the required resistance with the actual resistance to adjust the applied force so that the required resistance matches the actual resistance.

2. The torque sensor device for the resistance system according to claim 1, characterized in that, When the first ring of the bearing housing is fitted into the shaft hole, a movable gap is formed between the shaft hole and the long groove, allowing the bearing housing to move in the direction of the strain block.

3. The torque sensor device for the resistance system according to claim 2, characterized in that, The protruding plate at the top of the strain gauge has a free end on its extended side without any fixing, giving it the elasticity to deform.

4. The torque sensor device for the resistance system according to claim 1, characterized in that, The positioning element includes a snap ring or positioning ring, which is fitted onto the groove to position the bearing housing on the shaft hole.

5. The torque sensor device for the resistance system according to claim 1, characterized in that, The flywheel's shaft is locked at one end with a first nut and a first screw, and a pulley is fitted at the other end with a second nut and a second screw.

6. The torque sensor device for the resistance system according to claim 1, characterized in that, The torque sensor is locked to the left and right plates by a third screw.

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