Torque sensing device and electric bicycle

Abstract

The utility model discloses a torque sensing device which comprises a shaft roller, a shell structure, a primary control circuit unit, a secondary control circuit unit and at least one first deformation sensor. The secondary control circuit unit comprises a secondary data processing circuit and a secondary coil, the secondary data processing circuit is electrically connected with the secondary coil, and the primary data processing circuit provides electric energy for the secondary data processing circuit in a wireless mode through the primary coil and the secondary coil; and the secondary control circuit unit performs wireless signal transmission with the primary control circuit unit through the primary coil and the secondary coil.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycles, specifically to a torque sensing device and an electric bicycle. Background Technology

[0002] In the electric bicycle industry, people have increasingly higher demands for short-distance smart travel or smart cycling for health and wellness, making torque sensing during riding essential. To achieve torque sensing for both left and right feet (dual-sided torque sensors), current technologies mostly involve placing a metal sleeve on the axle as a necessary component for torque sensing. This sleeve is then directly or indirectly connected to the sprocket. Thus, regardless of whether the pedaling force is from the left or right foot, it is transmitted to the sprocket through the metal sleeve. A deformation sensor detects the deformation of the metal sleeve to sense the pedaling torque from both feet. However, existing torque sensing solutions using metal sleeves are not compatible with traditional bicycle sprockets (which require custom-made sprockets), significantly increasing material costs, assembly complexity, and after-sales difficulties. Utility Model Content

[0003] The main purpose of this invention is to provide a torque sensing device and an electric bicycle to solve the problem that the metal sleeve torque sensing solution is not compatible with traditional bicycle chainrings.

[0004] To achieve the above objectives, the torque sensing device proposed in this utility model includes a shaft, a housing structure, a primary control circuit unit, a secondary control circuit unit, and at least one first deformation sensor. The secondary control circuit unit is sleeved on and fixedly connected to the shaft, and is electrically connected to the first deformation sensor. The primary control circuit unit is fixedly connected to the housing structure and includes a primary data processing circuit and a primary coil. The primary data processing circuit is electrically connected to the primary coil, and both the primary data processing circuit and the primary coil are fixedly connected to the housing structure. The secondary control circuit unit includes a secondary data processing circuit and a secondary coil. The secondary data processing circuit is electrically connected to the secondary coil, and both the secondary data processing circuit and the secondary coil are fixedly connected to the shaft. The primary data processing circuit provides power to the secondary data processing circuit wirelessly through the primary coil and the secondary coil.

[0005] The secondary control circuit unit transmits wireless signals to the primary control circuit unit through the primary coil and the secondary coil; or...

[0006] The secondary control circuit unit further includes an infrared emitting element, and the primary control circuit unit further includes an infrared receiving element. The infrared emitting element is electrically connected to the secondary data processing circuit, and the infrared receiving element is electrically connected to the primary data processing circuit. The secondary data processing circuit transmits signals to the primary data processing circuit in the form of infrared signals through the infrared emitting element and the infrared receiving element.

[0007] Optionally, the axle roller is provided with a crank assembly mark, which is used to indicate the assembly direction of the crank; the assembly direction of the crank is the direction in which the crank axle roller mounting hole points to the foot pedal mounting hole; the first deformation sensor is fixedly connected to the axle roller.

[0008] Optionally, the end face of the shaft roller is used as the reference plane, and the line connecting the center of the shaft roller mounting hole of the crank and the center of the foot pedal mounting hole and extending therefrom is used as the reference line. The line connecting the center point of the first deformation sensor and the center point of the end face of the shaft roller is used as the first connecting line. The angle between the first connecting line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, or 315°.

[0009] Optionally, the torque sensing device further includes at least one second deformation sensor, the line connecting the center point of the second deformation sensor and the center point of the end face of the shaft is a second line, and the angle between the second line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, or 315°.

[0010] Optionally, the torque sensing device further includes a right bearing and a left bearing, which are sleeved on both ends of the shaft; the first deformation sensor and / or the second deformation sensor are located between the left bearing and the right bearing of the shaft.

[0011] Optionally, the secondary control circuit unit transmits wireless signals to the primary control circuit unit via the primary coil and the secondary coil in a wireless manner using a wireless signal modulated carrier signal, or the primary data processing circuit and the secondary data processing circuit are each electrically connected to a secondary coil, and the secondary data processing circuit transmits torque signals to the primary data processing circuit via the secondary coil in a wireless manner.

[0012] Optionally, the number of the first deformation sensors is two, and the two first deformation sensors are arranged symmetrically.

[0013] Optionally, the outer surface of the shaft is provided with a mounting plane for mounting the first deformation sensor.

[0014] Optionally, the secondary control circuit unit further includes a secondary protective sleeve, which is sleeved on the outside of the shaft, and the secondary protective sleeve and the outer surface of the shaft form a mounting cavity, wherein the secondary data processing circuit and the secondary coil are located inside the mounting cavity.

[0015] Optionally, the torque sensing device further includes a shielding plate disposed between the shaft and the secondary coil; and / or, the shielding plate is disposed on the outer casing structure outside the primary coil.

[0016] Optionally, the primary coil and / or secondary coil are coils extending around the shaft or planar coils extending in a vertical direction around the mounting surface.

[0017] Optionally, the area of ​​the overlapping portion of the primary coil and the secondary coil is greater than 80% of the surface area of ​​the smaller of the two.

[0018] Optionally, the torque sensing device further includes a shielding plate disposed between the shaft and the secondary coil; and / or, the shielding plate is disposed on the outer casing structure outside the primary coil. Additionally, this application also provides an electric bicycle including the torque sensing device described above. This torque sensing device can be a torque sensor device with a common bottom bracket structure, and can also be applied to the interior of the mid-drive motor of an electric bicycle.

[0019] In this invention, a first deformation sensor is fixedly connected to the shaft. The first deformation sensor senses the torque of the left and right feet by sensing the bending force, shear force, or resultant force of the shaft. Compared to metal sleeve sensing methods, the first deformation sensor is smaller, the gear is universal, and no special custom gear is required, reducing after-sales difficulty and assembly complexity. Furthermore, by setting crank assembly markings to indicate the crank assembly direction, the consistency of the torque sensing device can be improved, thereby enhancing the sensing accuracy of the torque sensing device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 Here are some schematic diagrams of existing torque sensing devices;

[0022] Figure 2 This is a schematic diagram of the structure of a torque sensing device according to an embodiment of this application;

[0023] Figure 3 This is an exploded view of a torque sensing device according to an embodiment of this application;

[0024] Figure 4 This is a cross-sectional schematic diagram of a torque sensing device according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the assembly of a torque sensing device and a crank according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram showing two assembly angle directions of the crank and the shaft according to an embodiment of this application;

[0027] Figure 7 for Figure 5 A structural diagram from another perspective;

[0028] Figure 8 This is a schematic diagram of the structure of the crank and the first deformation sensor under the force at the shaft roller mounting angle according to an embodiment of this application;

[0029] Figure 9 This is a force diagram of a first deformation sensor according to an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of the resultant force of a torque sensing device under the conditions of pedaling force and chain tension, according to an embodiment of this application.

[0031] Figure 11 This is a schematic diagram illustrating the positional relationship between the first connecting line and the baseline in an embodiment of this application;

[0032] Figure 12 This is a schematic diagram showing the positions of the first deformation sensor and the second deformation sensor on the surface of the shaft roller according to an embodiment of this application;

[0033] Figure 13 This is a schematic diagram of the assembly of the first deformation sensor and the shaft in one embodiment of this application;

[0034] Figure 14 for Figure 4 Enlarged view of point A in the middle;

[0035] Figure 15 for Figure 4 Enlarged view of point B in the middle;

[0036] Figure 16 This is a schematic diagram of the structure of the fixed housing in a torque sensing device according to an embodiment of this application;

[0037] Figure 17 This is a schematic diagram of the right bowl component in a torque sensing device according to an embodiment of this application.

[0038] Explanation of icon numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] For ease of description, features representing space, such as slots, holes, and cavities, are labeled with arrowed leader lines in the accompanying drawings, while solid structural features are labeled with un-arrowed leader lines in the accompanying drawings.

[0048] To better illustrate the technical solution of this application, relevant technical solutions of existing products are introduced for explanation. Figure 1 This is a schematic diagram of a torque sensing device. In existing torque sensing devices, the device includes a shaft 10 and a metal sleeve 200. One end of the shaft 10 is connected to a left crank 301, which is connected to a left pedal; the other end of the shaft 10 is connected to a right crank 302, which is connected to a right pedal. Stepping on the left and right pedals rotates the shaft 10. The metal sleeve 200 is fitted over the shaft 10 and is directly or indirectly connected to a gear 400. The pedaling force from the left and right pedals is transmitted to the gear 400 through the metal sleeve 200. The gear 400 can be coupled with a chain or belt to transmit power. A deformation sensor is installed on the metal sleeve 200. The deformation sensor senses the pedaling torque of the left and right feet by sensing the deformation of the metal sleeve 200.

[0049] However, the aforementioned existing torque sensing devices use the metal sleeve 200 directly or indirectly ( Figure 1 The chainring 400 (directly connected to the crank) is not compatible with traditional bicycle chainring 400s (the chainring 400 requires special customization; if you want to use it...) Figure 1 The torque sensor in the motor requires that the gear 400 and the right crank 302 be two independent components, which necessitates special customization of the gear 400 and the right crank 302. This significantly increases the cost, after-sales difficulty, and assembly complexity.

[0050] To address the aforementioned problems, this utility model provides a torque sensing device 100. In one embodiment, as shown... Figures 2 to 5 As shown, Figure 2 This is a schematic diagram of the structure of a torque sensing device 100 according to an embodiment of this application. Figure 3 This is an exploded view of a torque sensing device 100 according to an embodiment of this application. Figure 4 This is a cross-sectional schematic diagram of a torque sensing device according to an embodiment of this application. Figure 5 This is a schematic diagram of the assembly of a torque sensing device 100 and a crank according to an embodiment of this application.

[0051] The torque sensing device 100 includes a shaft roller 10, a housing structure 20, a primary control circuit unit 30, a secondary control circuit unit 40, and a first deformation sensor 51. In this embodiment, the shaft roller 10 is provided with a crank assembly mark 11, which indicates the assembly direction of the cranks 300 (including the left crank 301 and the right crank 302). The crank assembly mark 11 can be an arrow or other forms, such as dots, lines, or structural elements. Figure 2 As shown in Figure (a), the crank assembly marking 11 is an arrow. The arrow indicates the assembly direction of the crank 300, which is the direction from the crank shaft mounting hole 303 to the foot pedal mounting hole 304, ensuring that the angle between the position of the first deformation sensor 51 on the shaft 10 and the assembly direction of the crank 300 is consistent. Figure 2 As shown in Figures (b) and (c), crank assembly marking 11 is a line. Figure 2 As shown in Figure (d), the crank assembly mark 11 is a structural design. Special structures at both ends of the shaft roller ensure that the crank assembly direction is consistent with the angle of the first deformation sensor 51 at its attachment position on the shaft roller 10. According to one embodiment of this application, this special structure involves milling the circumferentially arranged teeth at both ends of the shaft roller to form a plane extending axially along the shaft roller 10.

[0052] The shapes of the two ends of the shaft 10 are not restricted, such as Figure 2 As shown in Figures (a) and (b), the two ends of the shaft 10 have a square shape. Figure 2 As shown in Figure (c), the two ends of the shaft roller 10 have a spline structure. The crank assembly markings 11 are located at different positions at both ends of the shaft roller 10 depending on the matching crank structure. The key point is to allow customers to easily identify the crank assembly direction when assembling the crank 300. See Figure (c). Figure 2 .

[0053] Specifically, the shaft roller 10 may have a crank assembly mark 11 at one end, indicating the assembly direction of one crank 300 (e.g., left crank 301), and the other crank 300 (right crank 302) may have the opposite assembly direction to the left crank 300 (left crank 301). Alternatively, crank assembly marks 11 may be provided at both ends of the shaft roller 10, indicating the assembly directions of the left crank 301 and the right crank 302 respectively.

[0054] Please see Figure 6 , Figure 6 This is a schematic diagram showing two assembly angles of the crank and shaft in one embodiment of this application. The shaft mounting hole 303 of the crank 300 is a square hole. The line connecting the center point of the shaft mounting hole 303 of the crank 300 and the center point of the foot pedal hole 304 extends to both ends and is called the crank direction extension line. Figure 6 (Middle dashed line). For example... Figure 6As shown in Figure (a), the left and right sides of the mounting hole 303 are perpendicular to the extension line of the crank direction. The crank assembly mark 11 of the shaft roller 10 is indicated by a dot or line on the foot pedal side of the shaft roller 10, or by an arrow on the end face of the shaft roller to indicate the position of the foot pedal of the crank (the crank assembly mark 11 of the shaft roller 10 points to the foot pedal direction of the crank 300, as shown in Figure (a). Figure 5 and Figure 7 This design makes it easier for customers to identify the assembly angle of the crank 300 during assembly. For example... Figure 6 As shown in Figure (b), the edge of the mounting hole 303 is at a 45° angle to the extension line of the crank direction. The crank assembly mark 11 of the shaft roller 10 is indicated by a dot or line on the foot pedal side of the shaft roller 10, or by an arrow on the end face of the shaft roller to indicate the position of the crank foot pedal. Figure 5 and Figure 7 This design makes it easier for customers to identify the crank assembly angle during crank assembly. (The above...) Figure 6 Figures (a) and (b) show the angles of the two most commonly used square holes for the shaft mounting hole 303 of the crank 300. Viewed from the end face of the shaft as a reference plane, the line connecting the center point of the shaft 10 and the center of the mounting mark is parallel to the extended line of the crank direction.

[0055] Please see Figure 8 , Figure 8 for Figure 5 A structural schematic diagram from another perspective. There is at least one first deformation sensor 51, which is fixedly connected to the shaft roller 10, typically by adhesive. Using the end face of the shaft roller 10 as a reference plane, and the line connecting the center of the crank shaft roller mounting hole 303 and the center of the foot pedal mounting hole 304, extending from this line, is used as a reference line. The line connecting the center point of the first deformation sensor 51 to the center point of the end face of the shaft roller 10 is the first connecting line. The first connecting line forms a certain angle with the reference line; angles of 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315° are generally considered advantageous. The line connecting the crank assembly mark center and the axle roller axis can be parallel to the baseline. The first connecting line and the baseline form a certain angle to ensure that the angle of the first deformation sensor 51 at the axle roller 10 is consistent with the crank assembly direction, thereby ensuring that the angle of the first deformation sensor 51 is consistent with the direction of pedaling force when riding, thus achieving more accurate pedaling force perception.

[0056] Specifically, such as Figure 8 and Figure 9As shown, the torque sensor device also includes a left bearing 92 and a right bearing 82, which are sleeved at both ends of the shaft 10. The first deformation sensor 51 is located between the left bearing 92 and the right bearing 82. The angle between the first connecting line and the reference line is 90°. When the left crank 302 is pressed down and rotated, the left bearing 92 acts as a fulcrum, where the shaft is subjected to an upward force F1, and the right bearing 82 acts as a force-bearing fixing part, where the shaft is subjected to a downward force F2. At this time, the middle of the shaft 10 slightly arches upward and deforms. The first deformation sensor 51 senses the magnitude of the foot pedaling torque by sensing the degree of bending of the shaft 10.

[0057] like Figure 10 As shown, during riding, when the right crank is pressed down, a downward pedaling force is generated. Crank 300 drives the chainring to rotate, which in turn drives the chain to rotate. The chain pulls backward, generating tension, which causes the axle 10 to bend forward. Figure 10 As shown, force analysis is performed on the shaft roller 10. The resultant force can be obtained from the downward pedaling force and the chain tension. The angle between the direction of the resultant force and the extension line of the crank direction is approximately 45°. Therefore, the angle between the first line connecting the first deformation sensor 51 and the shaft roller and the reference line can be set to 45°, 135°, 225°, or 315° for better sensing effect.

[0058] The first deformation sensor 51 is a strain gauge. The angle between the first line connecting the strain gauge 51 and the shaft 10 and the reference line is typically set to 0°, 45°, 90°, 135°, 180°, 225°, 270°, or 315° for better relative sensing effect, in order to sense the bending deformation of the shaft 10 caused by external force. Compared to Figure 1 The solution for sensing the metal sleeve 200 in this patent allows the finished sensor to be smaller and simpler in structure. The key is that it can be used with ordinary bicycle chainring 400 (the chainring 400 and crank 302 are an integral structure), without the need for special customization of the chainring 400, which greatly reduces costs, after-sales difficulties and assembly complexity.

[0059] Furthermore, by setting the crank assembly mark 11 to indicate the assembly direction of the crank 300, and by using the first deformation sensor 51 and the first line connecting the shaft 10 to the reference line at a certain angle (typically set to 0°, 45°, 90°, 135°, 180°, 225°, 270°, or 315°), the first deformation sensor 51 can clearly sense the torque in the direction of force on the shaft 10, improving the consistency of the torque sensing device 100 and thus enhancing its sensing accuracy. Replaceable products that meet customer mass production requirements offer greater assurance of consistent pedaling force perception data during riding, better satisfying the riding experience of each end customer.

[0060] The secondary control circuit unit 40 is sleeved on the outside of the shaft roller 10 and fixedly connected. The secondary control circuit unit 40 is electrically connected to the first deformation sensor 51. The primary control circuit unit 30 is fixedly connected to the outer shell structure 20. The primary control circuit unit 30 provides power to the secondary control circuit unit 40 wirelessly through the primary coil and the secondary coil. At the same time, the primary control circuit unit 30 and the secondary control circuit unit 40 transmit the pedaling torque signal sensed by the first deformation sensor 51 to the primary control circuit unit 30 through the primary coil and the secondary coil in a modulation and demodulation manner.

[0061] The primary coil and / or secondary coil are coils extending around the shaft or planar coils extending vertically around the mounting surface. That is, the primary coil and secondary coil are coils capable of electromagnetic coupling to each other.

[0062] Preferably, the area of ​​the overlapping portion of the primary coil and the secondary coil is greater than 80% of the surface area of ​​the smaller of the two. This ensures the sensitivity of wireless signal transmission between the primary coil and the secondary coil.

[0063] like Figure 11 As shown, Figure 11 This is a schematic diagram illustrating the positional relationship between the first connecting line and the reference line according to an embodiment of this application. The right end face of the shaft roller 10 is taken as the reference plane, and the line connecting the center of the shaft roller mounting hole 303 of the crank 300 and the center of the foot pedal mounting hole 304 is taken as the reference line. The line connecting the center point of the first deformation sensor 51 and the center point of the shaft roller end face is the first connecting line. The first connecting line forms a certain angle with the reference line. Figure 11 For example, 45°. Figure 11 The arrow in the middle crank assembly marking 11 is the right end face arrow of the shaft, pointing to the assembly direction of the right crank 302. Figure 10 Figure (b) is Figure 10 The left crank graphic is removed from Figure (a) for easier observation and description.

[0064] In some embodiments, two first deformation sensors 51 are used, and the two first deformation sensors 51 are symmetrically arranged around the axis of the shaft. The two deformation sensors are usually integrated into a full-bridge circuit, which can effectively avoid interference from temperature and other forces, thereby improving the measurement accuracy of the torque sensor 100.

[0065] In some embodiments, the torque sensing device 100 further includes at least one second deformation sensor 52. The end face of the axle roller is used as the reference plane, and the line connecting the center of the crank axle roller mounting hole 303 and the center of the foot pedal mounting hole 304 is used as the reference line. The line connecting the center point of the second deformation sensor and the center point of the end face of the axle roller is the second line. The second line forms a certain angle with the reference line. The angle is usually set to 0°, 45°, 90°, 135°, 180°, 225°, 270° or 315°. The first deformation sensor 51 and the second deformation sensor 52 are generally used to sense the downward force of the foot pedal (the size of the upward bending of the middle part of the axle roller), and the other is used to sense the size of the backward pulling force of the chain caused by the pedaling force (the size of the bending of the middle part of the axle roller towards the front of the vehicle).

[0066] In some embodiments, please refer to Figure 12 , Figure 12 This is a schematic diagram showing the positional relationship between the first deformation sensor 51 and the second deformation sensor 52 on the surface of the shaft in a torque sensing device 100 according to an embodiment of this application. The positions of the first deformation sensor 51 and the second deformation sensor 52 are typically set to be parallel or perpendicular, so as to compare the downward force of the foot pedal and the backward pulling force generated by the chain, since the downward force of the foot pedal and the backward pulling force generated by the chain are approximately 90 degrees apart. Figure 12 As shown in Figure (a), the first line is perpendicular to the second line. Figure 12 As shown in Figure (b), the first line is parallel to the second line. The first deformation sensor 51 is used to sense the bending deformation of the axle 10 in the vertical direction when the crank 300 is pedaling in the horizontal direction. The second deformation sensor 52 is used to sense the bending deformation of the axle 10 in the front-back direction caused by the chain pulling backward when the crank 300 is horizontal during riding. By combining the data sensed by the first deformation sensor 51 and the second deformation sensor 52, the accuracy of the torque sensed by the torque sensing device 100 can be improved and the misjudgment of the actual pedaling riding behavior can be reduced. When the user's foot is on the pedal and the chain is rotating, a torque signal that changes the magnitude of the pedaling force should be output. When the user is only pedaling and the chain is not rotating, the torque should not change. This allows for a more realistic sensing of the actual pedaling force data of the rider.

[0067] In one embodiment, two second deformation sensors 52 are used, and the two second deformation sensors 52 are symmetrically arranged around the axis of the shaft. The two deformation sensors are usually integrated into a full-bridge circuit, which can effectively avoid interference from temperature and other forces, thereby improving the measurement accuracy of the torque sensor 100.

[0068] Please see Figure 13The outer surface of the shaft 10 is provided with a mounting plane 12 for mounting the first deformation sensor 51 and / or the second deformation sensor 52. By providing the mounting plane 12 on the shaft 10 to mount the first deformation sensor 51 and / or the second deformation sensor 52, the torque sensor 100 is easier to manufacture and has a more compact structure.

[0069] like Figure 13 As shown in Figure (a), the first deformation sensor 51 can be directly mounted on the outer circular surface of the shaft 10. Figure 13 As shown in Figure (b), the first deformation sensor 51 can also be mounted on the mounting plane 12 provided on the shaft roller 10.

[0070] The first deformation sensor 51 and / or the second deformation sensor 52 can be fixedly connected to the surface of the mounting plane 12 by adhesive. The adhesive only needs to be sufficient to firmly bond the first deformation sensor 51 and / or the second deformation sensor 52 to the surface of the mounting plane 12. Providing the mounting plane 12 of the shaft roller 10 facilitates the easy mounting of the first deformation sensor 51 and / or the second deformation sensor 52 to its surface, thereby improving production efficiency. This application does not limit the specific type of adhesive.

[0071] Please refer to the following: Figure 3 , Figure 4 , Figure 14 and Figure 15 , Figure 14 for Figure 4 Enlarged diagram of point A in the middle. Figure 15 for Figure 4 The enlarged schematic diagram at point B shows that the secondary control circuit unit 40 includes a secondary data processing circuit 41 and a secondary coil 42. The secondary data processing circuit 41 and the secondary coil 42 are electrically connected, and both are fixedly connected to the shaft 10. The secondary data processing circuit 41 can be a flexible circuit board, and it can be fixedly connected to the outer peripheral surface of the shaft 10 with adhesive.

[0072] The primary control circuit unit 30 includes a primary data processing circuit 31 and a primary coil 32. The primary data processing circuit 31 and the primary coil 32 are electrically connected, and both are fixedly connected to the housing structure 20. The primary data processing circuit 31 can be a flexible circuit board, and it can be fixedly connected to the housing structure 20 with adhesive, thereby securing the primary data processing circuit 31. The primary data processing circuit 31 provides power to the secondary data processing circuit 41 wirelessly through the primary coil 32 and the secondary coil 42.

[0073] The secondary data processing circuit 41 wirelessly transmits a carrier signal to the primary data processing circuit 31 via the primary coil 32 and the secondary coil 42 in a wireless manner. Alternatively, the primary data processing circuit 31 and the secondary data processing circuit 41 can be electrically connected to another coil, and the secondary data processing circuit 41 can also be electrically connected to another coil. The secondary data processing circuit 41 then transmits a torque signal to the primary data processing circuit 31 wirelessly via this other set of coils from the primary and secondary data processing circuits. In other words, the primary data processing circuit 31 and the secondary data processing circuit 41 can each be electrically connected to a secondary coil, and the secondary data processing circuit 41 transmits a torque signal to the primary data processing circuit wirelessly via the secondary coil.

[0074] Alternatively, the torque sensor 100 may also include an infrared emitting element 43 and an infrared receiving element 33. The infrared emitting element 43 is electrically connected to the secondary data processing circuit 41, and the infrared receiving element 33 is electrically connected to the primary data processing circuit 31. The secondary data processing circuit 41 transmits signals to the primary data processing circuit 31 wirelessly via the infrared emitting element 43 and the infrared receiving element 33. Infrared signal transmission via the infrared emitting element 43 and the infrared receiving element 33 offers advantages such as good transmission stability and strong anti-interference capability, effectively improving the quality of data transmission.

[0075] Please see Figure 4 and Figure 14 The secondary control circuit unit 40 also includes a secondary protective sleeve 44, which is fitted over the shaft 10, forming a mounting cavity 441 between the secondary protective sleeve 44 and the outer surface of the shaft 10. The secondary data processing circuit 41 and the secondary coil 42 are located within the mounting cavity 441. By setting the secondary protective sleeve 44, the secondary data processing circuit 41 and the secondary coil 42 are protected, preventing damage during production operations. Sealant can be filled into the mounting cavity 441 to achieve a waterproof seal for the secondary data processing circuit 41 and the secondary coil 42. Furthermore, it also improves the shock absorption and anti-vibration buffering performance of the secondary data processing circuit 41 and the secondary coil 42.

[0076] The shaft 10 has a third step 14, and the right end of the secondary protective sleeve 44 abuts against the third step 14. The third step 14 restricts the movement of the secondary protective sleeve 44 to the right. A step that is restricted by a bearing can also be used here.

[0077] Please see Figure 3 and Figure 4The housing structure 20 includes a mounting housing 24 and a fixing housing 25, which are fixedly connected. Specifically, the mounting housing 24 and the fixing housing 25 can be fixedly connected with adhesive. The primary data processing circuit 31 and the primary coil 32 are both fixedly connected to the mounting housing 24 to realize the installation and fixation of the primary data processing circuit 31 and the primary coil 32. Then, the mounting housing 24, which has fixed the primary data processing circuit 31, the primary coil 32 and the signal output line 101, is installed inside the fixing housing 25. Finally, the extra space between the mounting housing 24 and the fixing housing 25 can be filled with sealant to seal and waterproof the primary data processing circuit 31 and improve the shock absorption performance of the primary control circuit unit.

[0078] In some embodiments, please refer to Figure 15 The torque sensing device 100 also includes a shielding plate 60, which is disposed between the shaft 10 and the secondary coil 42; and / or, the shielding plate 60 is disposed on the mounting housing 24 outside the primary coil 32. By setting the shielding plate 60 to shield interference signals, the power transmission efficiency between the primary control circuit unit 30 and the secondary control circuit unit 40 is improved.

[0079] In some embodiments, please refer to Figure 14 The torque sensing device 100 also includes a speed sensor 70, which includes a speed sensing element 71 and a speed sensing element 72. The speed sensing element 72 is fixedly connected to the shaft 10, and the speed sensing element 71 is electrically connected to the primary data processing circuit 31. The speed sensing element 71 and the speed sensing element 72 are arranged opposite to each other.

[0080] The speed sensing element 72 can be made of ferromagnetic material, specifically a magnetic ring with several N and S magnetic poles on its outer diameter. The speed sensing element 71 is at least one Hall element. The speed of the roller 10 is determined by measuring the change in magnetic flux of the speed sensing element 72. Here, there are two Hall elements. The order of the magnetic poles on the surface of the magnetic ring 72 fixed on the roller 10 can determine the forward and reverse rotation of the roller 10. The speed and direction of the roller 10 are the pedal frequency data. Combined with its torque data, overall vehicle speed data, etc., the data is given to the vehicle control system. The vehicle control system uses the various riding perception data provided by these sensors to better control the torque and speed of the motor to meet the changing intelligent riding comfort, which is the so-called human-bike integrated riding experience.

[0081] In some embodiments, please refer to Figure 15The torque sensing device 100 also includes a right cup 81, a right bearing 82, and a first retaining ring 83. The right bearing 82 is sleeved on the right end of the shaft 10, and its inner ring is fixedly connected to the outer surface of the shaft 10. The outer ring of the right bearing 82 is clearance-fitted to the right cup 81. The shaft 10 is provided with a first step 13 and a retaining ring groove. One side (left side) of the inner ring of the right bearing 82 abuts against the first step 13, and the other side (right side) of the inner ring of the right bearing 82 abuts against the first retaining ring 83. The first retaining ring 83 is located in the retaining ring groove at the right end of the shaft (the first retaining ring 83 is optional; the inner ring of the right bearing 82 and the shaft 10 can be tightly fitted. The first retaining ring 83 can limit the rightward movement of the right bearing 82, thus ensuring product stability). The movement of the right bearing 82 along the axial direction of the shaft 10 is limited by the cooperation of the first step 13 and the first retaining ring 83.

[0082] Please see Figure 3 The torque sensing device 100 also includes a signal output line 101. The fixed housing 25 has a wire outlet hole 21 or a wire outlet groove, through which the signal output line 101 passes.

[0083] Please refer to the following: Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the fixed housing 25 in a torque sensing device 100 according to an embodiment of this application. Figure 17 This is a schematic diagram of the right cup component 81 in a torque sensing device 100 according to an embodiment of this application. The fixed housing 25 is provided with an anti-rotation rib 22, which extends axially along the shaft 10. An anti-rotation groove 811 is formed on the right cup component 81, and the anti-rotation rib 22 is located within the anti-rotation groove 811. Through the cooperation of the anti-rotation rib 22 and the anti-rotation groove 811, the rotation of the fixed housing 25 is prevented from causing the signal output line 101 to rotate, break, or be damaged, thus preventing the product from functioning properly.

[0084] The torque sensing device 100 also includes a left cup 91, a left bearing 92, and a second retaining ring 93. The left bearing 92 is sleeved on the outside of the left end of the shaft 10. The inner ring of the left bearing 92 is connected to the outer surface of the shaft 10, and the outer ring of the left bearing 92 is clearance-fitted to the left cup 91. One side (left side) of the left bearing 92 abuts against the second retaining ring 93, which is located in a retaining ring groove at the left end of the shaft 10. Second steps 23 are provided at both ends of the fixed housing 25, respectively located within the outer rings of the left bearing 92 and the right bearing 82, thereby fixing the radial movement of the fixed housing 25. The movement of the left bearing 92 along the axial direction of the shaft 10 is restricted by the cooperation of the fixed housing 25 and the second retaining ring 93.

[0085] In some embodiments, the main core technology can be applied not only to a torque sensor device for a common bottom bracket structure of an electric bicycle, but also to a torque sensor device inside the mid-mounted motor of an electric bicycle.

[0086] In addition, this utility model also provides an electric bicycle, including the torque sensing device 100 as described above. The specific structure of the torque sensing device 100 is as described in the above embodiments. Since the electric bicycle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0087] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A torque sensing device, characterized in that, The torque sensing device includes a shaft, a housing structure, a primary control circuit unit, a secondary control circuit unit, and at least one first deformation sensor. The secondary control circuit unit is sleeved on and fixedly connected to the shaft, and is electrically connected to the first deformation sensor. The primary control circuit unit is fixedly connected to the housing structure and includes a primary data processing circuit and a primary coil. The primary data processing circuit is electrically connected to the primary coil, and both the primary data processing circuit and the primary coil are fixedly connected to the housing structure. The secondary control circuit unit includes a secondary data processing circuit and a secondary coil. The secondary data processing circuit is electrically connected to the secondary coil, and both the secondary data processing circuit and the secondary coil are fixedly connected to the shaft. The primary data processing circuit provides power to the secondary data processing circuit wirelessly through the primary and secondary coils. The secondary control circuit unit transmits wireless signals to the primary control circuit unit through the primary coil and the secondary coil; or... The secondary control circuit unit further includes an infrared emitting element, and the primary control circuit unit further includes an infrared receiving element. The infrared emitting element is electrically connected to the secondary data processing circuit, and the infrared receiving element is electrically connected to the primary data processing circuit. The secondary data processing circuit transmits signals to the primary data processing circuit in the form of infrared signals through the infrared emitting element and the infrared receiving element.

2. The torque sensing device as described in claim 1, characterized in that, The axle roller is provided with a crank assembly mark, which is used to indicate the assembly direction of the crank; the assembly direction of the crank is the direction in which the crank axle roller mounting hole points to the foot pedal mounting hole; the first deformation sensor is fixedly connected to the axle roller.

3. The torque sensing device as described in claim 2, characterized in that, Using the end face of the shaft roller as the reference plane, the line connecting the center of the shaft roller mounting hole of the crank and the center of the foot pedal mounting hole and extending therefrom is used as the reference line. The line connecting the center point of the first deformation sensor and the center point of the end face of the shaft roller is the first connecting line. The angle between the first connecting line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°.

4. The torque sensing device as described in claim 3, characterized in that, The torque sensing device further includes at least one second deformation sensor. The line connecting the center point of the second deformation sensor and the center point of the end face of the shaft is a second line. The angle between the second line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, or 315°.

5. The torque sensing device as described in claim 4, characterized in that, The torque sensing device further includes a right bearing and a left bearing, which are sleeved on both ends of the shaft; the first deformation sensor and / or the second deformation sensor are located between the left bearing and the right bearing of the shaft.

6. The torque sensing device as described in claim 1, characterized in that, The secondary control circuit unit transmits wireless signals to the primary control circuit unit via the primary coil and the secondary coil in a wireless manner by modulating the carrier signal with a wireless signal. Alternatively, the primary data processing circuit and the secondary data processing circuit are each electrically connected to a secondary coil, and the secondary data processing circuit transmits torque signals to the primary data processing circuit via the secondary coil in a wireless manner.

7. The torque sensing device as described in claim 1, characterized in that, The number of the first deformation sensors is two, and the two first deformation sensors are arranged symmetrically.

8. The torque sensing device as described in claim 1, characterized in that, The outer surface of the shaft is provided with a mounting plane, which is used to mount the first deformation sensor.

9. The torque sensing device as described in claim 1, characterized in that, The secondary control circuit unit also includes a secondary protective sleeve, which is fitted over the shaft and forms a mounting cavity between the secondary protective sleeve and the outer surface of the shaft. The secondary data processing circuit and the secondary coil are located inside the mounting cavity.

10. The torque sensing device as described in claim 1, characterized in that, The torque sensing device further includes a shielding plate disposed between the shaft and the secondary coil; and / or, the shielding plate is disposed on the outer shell structure outside the primary coil.

11. The torque sensing device as described in claim 1, characterized in that, The primary coil and / or secondary coil are coils extending around the shaft or planar coils extending in a vertical direction around the mounting surface.

12. The torque sensing device as described in claim 1, characterized in that, The area of ​​the overlapping portion of the primary and secondary coils is greater than 80% of the surface area of ​​the smaller of the two.

13. An electric bicycle, characterized in that, The electric bicycle includes a torque sensing device as described in any one of claims 1 to 12.

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