Torque sensor and bicycle

Abstract

The invention discloses a torque sensor and a bicycle. The torque sensor comprises a shaft stick, a shell structure, a primary control circuit unit, a secondary control circuit unit and at least one first deformation sensor, the primary control circuit unit is arranged in the shell structure; the secondary control circuit unit is arranged outside the shaft roller in a sleeving manner, and the secondary control circuit unit is electrically connected with the first deformation sensor; the first deformation sensor is arranged on the surface of the shaft stick and fixedly connected with the shaft stick. The first deformation sensor is fixedly connected with the shaft stick, and the first deformation sensor senses the moment of force of the left foot and the right foot by sensing the bending force, the shearing force or the resultant force of the shaft stick.

Description

Technical Field

[0001] The present invention relates to the field of bicycles, and particularly to a torque sensor and a bicycle. Background Art

[0002] In the field of bicycles, people have higher and higher requirements for short-distance intelligent travel or large-health intelligent cycling sports, and torque perception during cycling has become a necessity. In order to sense the torques of both the left and right feet (bilateral torque sensor), in the prior art, mostly a metal sleeve is provided on the axle rod as a necessary accessory for torque induction, and this metal sleeve is directly or indirectly connected to the chainring. In this way, whether it is the pedaling force of the left foot or the right foot, it is transmitted to the chainring through the metal sleeve, and the deformation sensor senses the deformation of the metal sleeve to sense the pedaling torques of the left and right feet. However, the existing scheme of sensing torque through the metal sleeve is not universal for traditional bicycle chainrings (the chainring needs to be specially customized), which greatly increases the material cost, assembly complexity, after-sales difficulty, etc. Summary of the Invention

[0003] The main object of the present invention is to provide a torque sensor and a bicycle to solve the problem that the scheme of sensing torque through the metal sleeve is not universal for traditional bicycle chainrings.

[0004] To achieve the above object, the torque sensor proposed by the present invention includes an axle rod, a housing structure, a primary control circuit unit, a secondary control circuit unit, and at least one first deformation sensor. The primary control circuit unit is disposed in the housing structure; wireless signal transmission is performed between the primary control circuit unit and the secondary control circuit unit, and the primary control circuit unit provides electrical energy for the secondary control circuit unit in a wireless manner.

[0005] The secondary control circuit unit is sleeved outside the axle rod, and the secondary control circuit unit is electrically connected to the first deformation sensor.

[0006] The first deformation sensor is disposed on the surface of the axle rod and fixedly connected to the axle rod.

[0007] Taking the end face of the axle rod as a reference plane, taking the connection line between the center of the axle rod mounting hole of the crank and the center of the pedal mounting hole and extending it as a reference line, the connection line between the center point of the first deformation sensor and the center point of the end face of the axle rod is a first connection line, and the first connection line is parallel to, perpendicular to, or at an angle of 45° with the reference line.

[0008] Optionally, the angle between the first connection line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

[0009] Optionally, the shaft is provided with a crank assembly mark for indicating the assembly direction of the crank; the assembly direction of the crank is the direction in which the shaft mounting hole of the crank points to the pedal mounting hole; the first deformation sensor is fixedly connected to the shaft.

[0010] Optionally, the torque sensor 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 the second connection line, and the angle between the second connection line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

[0011] Optionally, the torque sensor further includes a right bearing and a left bearing. The right bearing and the left bearing are sleeved at both ends of the shaft, and the first deformation sensor is located between the left bearing and the right bearing. The first deformation sensor and / or the second deformation sensor is located between the left bearing and the right bearing of the shaft.

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

[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 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 control circuit unit 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 primary data processing circuit provides electrical energy for the secondary data processing circuit through the primary coil and the secondary coil.

[0015] Optionally, the secondary control circuit unit performs wireless signal transmission to the primary control circuit unit in a wireless manner of modulating a carrier signal through the primary coil and the secondary coil;

[0016] Optionally, the primary data processing circuit and the secondary data processing circuit are respectively electrically connected to a secondary coil. The secondary data processing circuit transmits the torque signal to the primary data processing circuit in a wireless signal manner through the secondary coil.

[0017] Optionally, 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 control circuit unit performs wireless signal transmission to the primary control circuit unit through the infrared emitting element and the infrared receiving element.

[0018] Optionally, the secondary control circuit unit further includes a secondary protective sleeve. The secondary protective sleeve is sleeved outside the shaft rod, and an installation cavity is formed between the secondary protective sleeve and the outer surface of the shaft rod. The secondary data processing circuit and the secondary coil are located in the installation cavity.

[0019] Optionally, the torque sensor further includes a shielding sheet. The shielding sheet is disposed between the shaft rod and the secondary coil; and / or, the shielding sheet is disposed on the housing structure outside the primary coil. In addition, the present application also provides a bicycle, and the bicycle includes the torque sensor as described above.

[0020] In the technical solution of the present invention, the first deformation sensor is fixedly connected to the shaft rod. The first deformation sensor senses the bending force, shear force or resultant force of the shaft rod to sense the torque of the left and right feet. Compared with the scheme sensed by the metal sleeve, the volume of the first deformation sensor is smaller, and the sprocket can be universal without special customization, reducing the after-sales difficulty and assembly complexity. And by setting the crank assembly mark to indicate the assembly direction of the crank, the consistency of the torque sensor can be improved, thereby improving the sensing accuracy of the torque sensor. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a related schematic diagram of an existing torque sensor;

[0023] Figure 2 It is a schematic structural diagram of a torque sensor according to an embodiment of the present application;

[0024] Figure 3 It is an exploded schematic diagram of a torque sensor according to an embodiment of the present application;

[0025] Figure 4 It is a schematic cross-sectional view of a torque sensor according to an embodiment of the present application;

[0026] Figure 5 Schematic diagram of the assembly of the torque sensor and the crank in an embodiment of the present application;

[0027] Figure 6 Schematic diagrams of two assembly angle directions of the crank and the shaft rod in an embodiment of the present application;

[0028] Figure 7 is Figure 5 Schematic diagram of the structure from another perspective;

[0029] Figure 8 Schematic diagram of the structure of the crank and the first deformation sensor under force at the installation angle of the shaft rod in an embodiment of the present application;

[0030] Figure 9 Schematic diagram of the force on the first deformation sensor in an embodiment of the present application;

[0031] Figure 10 Schematic diagram of the resultant force on the torque sensor under the conditions of the stepping force and the tension of the chain in an embodiment of the present application;

[0032] Figure 11 Schematic diagram of an example of the positional relationship between the first connection line and the reference line in an embodiment of the present application;

[0033] Figure 12 Schematic diagram of the positions of the first deformation sensor and the second deformation sensor on the surface of the shaft rod in an embodiment of the present application;

[0034] Figure 13 Schematic diagram of the assembly of the first deformation sensor and the shaft rod in an embodiment of the present application;

[0035] Figure 14 is Figure 4 Enlarged schematic diagram of location A in;

[0036] Figure 15 is Figure 4 Enlarged schematic diagram of location B in;

[0037] Figure 16 Schematic diagram of the structure of the fixed housing in the torque sensor in an embodiment of the present application;

[0038] Figure 17 Schematic diagram of the structure of the right bowl part in the torque sensor in an embodiment of the present application.

[0039] Explanation of the reference numerals in the drawings:

[0040]

[0041]

[0042] The realization, functional features, and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific Embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] For convenience of description, features representing spaces such as slots, holes, and cavities are marked with lead lines with arrows in the accompanying drawings, and solid structure features are marked with lead lines without arrows in the accompanying drawings.

[0049] To better elaborate the technical solutions of the present application, the related technical solutions of existing products are specifically introduced for illustration. Figure 1It is a related schematic diagram of a torque sensor. In the existing torque sensor, the existing torque sensor includes a shaft rod 10 and a metal sleeve 200. One end of the shaft rod 10 is connected to the left crank 301, and the left crank 301 is connected to the left pedal; the other end of the shaft rod 10 is connected to the right crank 302, and the right crank 302 is connected to the right pedal. The shaft rod 10 is rotated by stepping on the left pedal and the right pedal. The metal sleeve 200 is sleeved outside the shaft rod 10, and the metal sleeve 200 is directly or indirectly connected to the sprocket 400. The pedaling forces of the left pedal and the right pedal are both transmitted to the sprocket 400 through the metal sleeve 200, and the sprocket 400 can cooperate with a chain or a belt to achieve power transmission. A deformation sensor is arranged on the metal sleeve 200, and the deformation sensor senses the pedaling torque of the left and right feet by sensing the deformation of the metal sleeve 200.

[0050] However, in the above-mentioned existing torque sensor 100, since the metal sleeve 200 is directly or indirectly ( Figure 1 directly connected to the crank) connected to the sprocket 400. If it is to be matched with Figure 1 the torque sensor in, the sprocket 400 and the right crank 302 must be two independent components, which requires special customization of the sprocket 400 and the right crank 302. Therefore, the traditional bicycle sprocket 400 cannot be universal. This greatly increases the cost, after-sales difficulty and assembly complexity.

[0051] To solve the above problems, the present invention provides a torque sensor 100. In one embodiment, as Figures 2 to 5 shown, Figure 2 This is a schematic structural diagram of the torque sensor 100 according to an embodiment of the present application, Figure 3 This is an exploded schematic diagram of the torque sensor 100 according to an embodiment of the present application, Figure 4 This is a cross-sectional schematic diagram of the torque sensor according to an embodiment of the present application, Figure 5 This is an assembly schematic diagram of the torque sensor 100 and the crank according to an embodiment of the present application.

[0052] The torque sensor 100 includes a shaft rod 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 rod 10 is provided with a crank assembly mark 11, and the crank assembly mark 11 is used to indicate the assembly direction of the crank 300 (including the left crank 301 and the right crank 302). The crank assembly mark 11 can be an arrow, or other ways, such as a dot, a line, or a structural body way. As Figure 2 shown in Figure (a) in, the crank assembly mark 11 is an arrow. By using the arrow to indicate the assembly direction of the crank 300, the assembly direction of the crank is the direction from the shaft rod mounting hole 303 of the crank to the pedal mounting hole 304, so as to achieve the angular consistency between the patch position of the first deformation sensor 51 on the shaft rod 10 and the assembly direction of the crank 300. As Figure 2As shown in Figures (b) and (c), the crank assembly identification 11 is a line. As Figure 2 shown in Figure (d), the crank assembly identification 11 is in the form of a structure, and the special structure at both ends of the shaft ensures the angular consistency between the assembly direction of the crank and the patch position of the first deformation sensor 51 on the shaft 10. According to an embodiment of the present application, the special structure is to mill the teeth arranged circumferentially at both ends of the shaft to form a plane extending along the axial direction of the shaft 10.

[0053] The shapes of both ends of the shaft 10 are not limited. As Figure 2 shown in Figures (a) and (b), the shapes of both ends of the shaft 10 are square structures. As Figure 2 shown in Figures (c) and (d), the shapes of both ends of the shaft 10 are spline structures. The crank assembly identification 11 is set at different positions at both ends of the shaft 10 according to the different structures of the matching crank. The key is to be able to simply and conveniently identify the assembly direction of the crank when the customer assembles the crank 300. See Figure 2 .

[0054] Specifically, the shaft 10 can be provided with a crank assembly identification 11 at one end to indicate the assembly direction of one crank 300 (for example, the left crank 301), and the assembly direction of the other crank 300 (the right crank 302) is opposite to that of this crank 300 (the left crank 301). It can also be provided with crank assembly identifications 11 at both ends of the shaft 10 to respectively indicate the assembly directions of the left crank 301 and the right crank 302.

[0055] Please refer to Figure 6 . Figure 6 For two schematic diagrams of the assembly angle directions between the crank and the shaft in an embodiment of the present application. The shaft assembly hole 303 of the crank 300 is a square hole. The line connecting the center points of the shaft assembly hole 303 and the pedal hole 304 of the crank 300 and extending to both ends is called the crank direction extension line ( Figure 6 the dotted line in the figure). As Figure 6 shown in Figure (a), the left and right sides of the assembly hole 303 are perpendicular to the crank direction extension line. The crank assembly identification 11 of the shaft 10 is in the form of a point or a line on the pedal side of the shaft 10, or an arrow is used on the end face of the shaft to indicate the pedal orientation of the crank (the crank assembly identification 11 of the shaft 10 points to the pedal direction of the crank 300, as Figure 5 and Figure 7 ), so as to more conveniently enable the customer to identify the assembly angle of the crank 300 during the assembly of the crank 300. As Figure 6 shown in Figure (b), the side of the assembly hole 303 forms a 45° angle with the crank direction extension line. The crank assembly identification 11 of the shaft 10 is in the form of a point or a line on the pedal side of the shaft 10, or an arrow is used on the end face of the shaft to indicate the pedal orientation of the crank, as Figure 5 and Figure 7) to more conveniently enable customers to identify the assembly angle of the crank during crank assembly. Above Figure 6 In FIGS. (a) and (b) in the middle, they are the angles of the two most commonly used square holes of the shaft assembly hole 303 of the crank 300. Observed with the end face of the shaft as the reference plane, the connection line between the center point of the shaft 10 and the center part of the assembly mark is parallel to the extension line of the crank direction.

[0056] Please refer to Figure 8 , Figure 8 is Figure 5 a structural schematic diagram from another perspective. The cross-section at one end of the shaft 10 is defined as the end face. The number of the first deformation sensors 51 is at least one, and the first deformation sensors 51 are fixedly connected to the shaft 10, usually by pasting the first deformation sensors 51 on the surface between the two end faces of the shaft 10 with glue. With the end face of the shaft 10 as the reference plane, taking the connection line between the center of the shaft mounting hole 303 of the crank and the center of the pedal mounting hole 304 and extending it as the reference line, the connection line between the center point of the first deformation sensor 51 and the center point of the end face of the shaft 10 is the first connection line. The first connection line is parallel to, perpendicular to, or has an included angle of 45° with the reference line. Preferably, there is a certain included angle between the first connection line and the reference line, and the included angle is usually set to be relatively beneficial at 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°. The connection line between the center of the crank assembly mark and the axis of the shaft can be parallel to the reference line, and there is a certain included angle between the first connection line and the reference line to ensure the angular consistency between the patch position of the first deformation sensor 51 on the shaft 10 and the crank assembly direction, and further ensure the angular consistency between the first deformation sensor 51 and the direction of the foot pedaling force during riding, so as to achieve a more accurate perception of the foot pedaling force.

[0057] Specifically, as Figure 8 and Figure 9 shown, the torque sensor device further includes a left bearing 92 and a right bearing 82, and the left bearing 92 and the right bearing 82 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 included angle between the first connection line and the reference line is 90°. When the left crank 302 rotates downward by stepping on it, the left bearing 92 serves as a fulcrum, and the shaft is subjected to an upward force F1 here, and the right bearing 82 serves as a force-receiving fixing part, and the shaft is subjected to a downward force F2 here. At this time, the middle of the shaft 10 arches upward slightly and deforms, and the first deformation sensor 51 senses the magnitude of the torque of the foot stepping on by sensing the magnitude of the bending of the shaft 10.

[0058] As Figure 10 shown, during the riding process, when the right crank steps on downward, a downward pedaling force will be generated. The crank 300 drives the chainring to rotate, the chainring drives the chain to rotate, and the chain pulls backward to generate a pulling force, and the pulling force of the chain will cause the shaft 10 to generate a forward bending deformation. As Figure 10As shown, the force analysis of the shaft rod 10 is performed, and the resultant force can be obtained through the downward pedaling force and the chain pulling force. The angle between the direction of the resultant force and the extension line of the crank direction is about 45°. Therefore, the angle between the first connecting line formed by the first deformation sensor 51 and the shaft rod and the reference line can be set to 45°, 135°, 225° or 315° for better sensing effect.

[0059] The first deformation sensor 51 is a strain gauge, and the angle between the first connecting line formed by the strain gauge 51 and the shaft 10 and the reference line is usually set to 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315° for better relative sensing effect, so as to sense the bending deformation of the shaft 10 caused by external force. Figure 1 The metal sleeve 200 sensing solution in this patent can make the finished sensor smaller and simpler in structure. The key is that ordinary bicycle chainrings 400 (the chainrings 400 and the crank 302 are an integral structure) can be used universally without the need for specially customized chainrings 400, which greatly reduces costs, after-sales difficulties and assembly complexity.

[0060] And by setting the crank assembly mark 11 to indicate the assembly direction of the crank 300, and in combination with the first connection line formed by the first deformation sensor 51 and the shaft rod 10, a certain angle is formed with the reference line. The angle is usually set to 0°, 45°, 90°, 135°, 180°, 225°, 270° or 315°, so that the first deformation sensor 51 can clearly sense the torque in the force direction of the shaft rod 10, and can improve the consistency of the torque sensor 100, thereby improving the sensing accuracy of the torque sensor 100. Therefore, the consistency of the pedaling force perception data of the mass-produced products of customers during riding is more guaranteed, and the good riding experience of each terminal customer is better satisfied.

[0061] Figure 14 for Figure 4 The enlarged schematic diagram of point A in the middle. Figure 15 for Figure 4 In the enlarged schematic diagram at B, the secondary control circuit unit 40 includes a secondary data processing circuit 41 and a secondary coil 42, the secondary data processing circuit 41 is electrically connected to the secondary coil 42, and the secondary data processing circuit 41 and the secondary coil 42 are both fixedly connected to the shaft 10. The secondary data processing circuit 41 can be a flexible circuit board, and the secondary data processing circuit 41 can be fixedly connected to the outer peripheral surface of the shaft 10 by glue.

[0062] The primary control circuit unit 30 includes a primary data processing circuit 31 and a primary coil 32. The primary data processing circuit 31 is electrically connected to the primary coil 32. Both the primary data processing circuit 31 and the primary coil 32 are fixedly connected to the housing structure 20. The primary data processing circuit 31 may be a flexible circuit board. The primary data processing circuit 31 may be fixedly connected to the housing structure 20 by glue, thereby fixing the primary data processing circuit 31. The primary data processing circuit 31 provides power to the secondary data processing circuit 41 by radio through the primary coil 32 and the secondary coil 42.

[0063] The secondary control circuit unit 40 is sleeved outside the shaft 10 and fixedly connected, and 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 housing structure 20, and the primary control circuit unit 30 provides power to the secondary control circuit unit 40 in a wireless manner 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 pedal torque signal sensed by the first deformation sensor 51 to the primary control circuit unit 30 in a wireless signal modulation and demodulation manner through the primary coil and the secondary coil 42.

[0064] Optionally, the primary data processing circuit 31 may be electrically connected to another coil, and the secondary data processing circuit 41 may be electrically connected to another coil. The secondary data processing circuit 41 transmits the torque signal to the primary data processing circuit 3 via wireless signals through the other group of coils of the primary and secondary data processing circuits.

[0065] like Figure 11 As shown, Figure 11 This is a schematic diagram showing an example of the positional relationship between the first connecting line and the reference line of an embodiment of the present application. The right end face of the shaft rod 10 is used as the reference plane, the connecting line between the center of the shaft rod mounting hole 303 of the crank 300 and the center of the pedal mounting hole 304 is used as the reference line, and the connecting line between the center point of the first deformation sensor 51 and the center point of the shaft rod end face is used as 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 of the middle crank assembly mark 11 is the arrow on the right end face of the shaft rod, pointing to the assembly direction of the right crank 302. Figure 10 Figure (b) shows Figure 10 In Figure (a), the left crank figure is removed to facilitate observation and description.

[0066] In some embodiments, two first deformation sensors 51 are used, and the two first deformation sensors 51 are symmetrically arranged about the axis center line of the shaft stick. The two deformation sensors are usually assembled into a full-bridge circuit in the circuit, which can effectively avoid the interference of temperature and other forces on it, which is beneficial to improve the measurement accuracy of the torque sensor 100.

[0067] In some embodiments, the torque sensor 100 further includes at least one second deformation sensor 52. Taking the end face of the shaft rod as the reference plane and the line connecting the center of the shaft rod mounting hole 303 of the crank and the center of the pedal mounting hole 304 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 shaft rod is the second line. There is a certain angle between the second line and the reference line, and the angle is usually set to 0°, 45°, 90°, 135°, 180°, 225°, 270° or 315°. Generally, the first deformation sensor 51 and the second deformation sensor 52 are such that one is used to sense the downward force of the foot stepping (the upward bending magnitude of the middle part of the shaft rod), and the other is used to sense the magnitude of the backward pulling force generated by the chain due to the stepping force (the bending magnitude of the middle part of the shaft rod in the direction of the front of the whole vehicle). The first deformation sensor and / or the second deformation sensor are located between the left bearing and the right bearing of the shaft rod.

[0068] In some embodiments, please refer to Figure 12 , Figure 12 is a schematic diagram of the positional relationship between the first deformation sensor 51 and the second deformation sensor 52 on the surface of the shaft rod in the torque sensor 100 according to an embodiment of the present application. As shown in Figure 12 Figure (a) therein, the first line is perpendicular to the second line. As shown in Figure 12 Figure (b) therein, the first line is parallel to the second line. The first deformation sensor 51 is used to sense the bending deformation of the shaft rod 10 in the up and down direction when the crank 300 is stepped on in the horizontal direction during the process of stepping on the crank 300. The second deformation sensor 52 is used to sense the bending deformation of the shaft rod 10 in the front and back direction caused by the backward pulling force of the chain when the crank 300 is in the horizontal direction during the riding process. By combining the data sensed by the first deformation sensor 51 and the second deformation sensor 52, the torque accuracy sensed by the torque sensor 100 can be improved and the misjudgment of the true stepping and riding behavior can be reduced. When the user steps on the pedal and the chain rotates during riding, a torque signal with a changing stepping force magnitude should be output. When the user only steps on the pedal without rotating the chain, the torque does not change, so that the stepping force data of the real rider can be sensed more realistically.

[0069] In one embodiment, two second deformation sensors 52 are used, and these two second deformation sensors 52 are symmetrically arranged with respect to the axis line of the shaft rod. The two deformation sensors usually form a full-bridge circuit in the circuit, which can well avoid the interference of temperature and other forces on it, and is beneficial to improving the measurement accuracy of the torque sensor 100.

[0070] Please refer to Figure 13, an installation plane 12 is provided on the outer surface of the shaft rod 10, and the installation plane 12 is used to install the first deformation sensor 51 and / or the second deformation sensor 52. By providing the installation plane 12 on the shaft rod 10 to install the first deformation sensor 51 and / or the second deformation sensor 52, the structure production of the torque sensor 100 is made more convenient for operation and the structure is more compact.

[0071] As Figure 13 shown in FIG. (a), the first deformation sensor 51 can be directly installed on the outer circular surface of the shaft rod 10. As Figure 13 shown in FIG. (b), the first deformation sensor 51 can also be installed on the installation plane 12 provided on the shaft rod 10.

[0072] The first deformation sensor 51 and / or the second deformation sensor 52 can be fixedly connected to the surface of the installation plane 12 by means of glue. The glue can tightly bond the first deformation sensor 51 and / or the second deformation sensor 52 to the surface of the installation plane 12. Providing the installation plane 12 of the shaft rod 10 can make it more convenient for the first deformation sensor 51 and / or the second deformation sensor 52 to be mounted on its surface, improving production efficiency. The specific type of glue in this application is not limited.

[0073] Please refer to Figure 3 , Figure 4 , Figure 14 and Figure 15 , Figure 14 which is Figure 4 the enlarged schematic diagram of part A in Figure 15 which is Figure 4 the enlarged schematic diagram of part B in . The secondary control circuit unit 40 includes a secondary data processing circuit 41 and a secondary coil 42. The secondary data processing circuit 41 is electrically connected to the secondary coil 42, and both the secondary data processing circuit 41 and the secondary coil 42 are fixedly connected to the shaft rod 10. The secondary data processing circuit 41 can be a flexible circuit board, and the secondary data processing circuit 41 can be fixedly connected to the outer peripheral surface of the shaft rod 10 by glue.

[0074] Please refer to Figure 3 , the primary control circuit unit 30 includes a primary data processing circuit 31 and a primary coil 32. The primary data processing circuit 31 is electrically connected to the primary coil 32, and both the primary data processing circuit 31 and the primary coil 32 are fixedly connected to the housing structure 20. The primary data processing circuit 31 can be a flexible circuit board, and the primary data processing circuit 31 can be fixedly connected to the housing structure 20 by glue, thereby realizing the fixation of the primary data processing circuit 31. The primary data processing circuit 31 provides electrical energy for the secondary data processing circuit 41 by radio through the primary coil 32 and the secondary coil 42.

[0075] The secondary data processing circuit 41 wirelessly transmits signals to the primary data processing circuit 31 through the primary coil 32 and the secondary coil 42. Alternatively, the primary data processing circuit and the secondary data processing circuit are respectively electrically connected to a secondary coil. The secondary data processing circuit transmits the torque signal to the primary data processing circuit in a wireless signal manner through the secondary coil. That is, the primary data processing circuit 31 is electrically connected to another coil, and the secondary data processing circuit 41 is also electrically connected to another coil. The secondary data processing circuit 41 transmits the torque signal to the primary data processing circuit 31 in a wireless manner through this additional set of coils of the primary and secondary data processing circuits. The method of wireless signal transmission can be modulating a carrier signal.

[0076] Alternatively, the torque sensor 100 further includes an infrared transmitting element 43 and an infrared receiving element 33. The infrared transmitting 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 in an infrared wireless manner through the infrared transmitting element 43 and the infrared receiving element 33. Implementing signal transmission in an infrared manner through the infrared transmitting element 43 and the infrared receiving element 33 has the advantages of better transmission stability and strong anti-interference ability, and can effectively improve the quality of data transmission.

[0077] Those skilled in the art can understand that both the electromagnetic induction coupling method and the infrared transceiver method belong to the category of generalized wireless communication.

[0078] Please refer to Figure 4 and Figure 14 , the secondary control circuit unit 40 further includes a secondary protective sleeve 44. The secondary protective sleeve 44 is sleeved outside the shaft rod 10, and an installation cavity 441 is formed between the secondary protective sleeve 44 and the outer surface of the shaft rod 10. The secondary data processing circuit 41 and the secondary coil 42 are located in the installation cavity 441. By providing the secondary protective sleeve 44, the secondary data processing circuit 41 and the secondary coil 42 are protected to avoid being damaged during production operations. At this time, sealant can be filled in the installation cavity 441 to achieve sealing and waterproofing of the secondary data processing circuit 41 and the secondary coil 42. Moreover, the shock absorption and anti-vibration buffering performance of the secondary data processing circuit 41 and the secondary coil 42 can also be improved.

[0079] The shaft rod 10 is formed with a third step 14. The right end of the secondary protective sleeve 44 abuts against the third step 14. By providing the third step 14, the rightward movement of the secondary protective sleeve 44 is restricted. Here, a step restricted by a bearing can also be used.

[0080] Please refer to Figure 3 and Figure 4The shell structure 20 includes a mounting shell 24 and a fixed shell 25, and the mounting shell 24 is fixedly connected to the fixed shell 25. Specifically, the mounting shell 24 and the fixed shell 25 can be fixedly connected by glue. The primary data processing circuit 31 and the primary coil 32 are both fixedly connected to the mounting shell 24 to achieve the installation and fixation of the primary data processing circuit 31 and the primary coil 32, and then the mounting shell 24 with the primary data processing circuit 31, the primary coil 32 and the signal output line 101 fixed is installed in the fixed shell 25, and finally, the extra space between the mounting shell 24 and the fixed shell 25 can be filled with sealant to achieve the sealing and waterproofing of the primary data processing circuit 31, and also improve the anti-seismic buffering performance of the primary control circuit unit.

[0081] In some embodiments, see Figure 15 The torque sensor 100 further includes a shielding sheet 60, which is disposed between the shaft 10 and the secondary coil 42; and / or, the shielding sheet 60 is disposed on the mounting housing 24 outside the primary coil 32. By providing the shielding sheet 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.

[0082] In some embodiments, see Figure 14 The torque sensor 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, the speed sensing element 71 is electrically connected to the primary data processing circuit 31, and the speed sensing element 71 and the speed sensing element 72 are arranged relative to each other.

[0083] The speed sensing element 72 can be a ferromagnetic material, specifically a magnetic ring with a plurality of N and S magnetic poles on the outer diameter. The speed sensing element 71 is at least one Hall element. The speed of the shaft stick 10 is determined by measuring the change in the magnetic flux of the speed sensing element 72. There are two Hall elements here. The two Hall elements can determine the forward and reverse rotation of the shaft stick 10 by the sequence of the magnetic poles on the surface of the magnetic ring 72 fixed on the shaft stick 10. The speed and direction of the shaft stick 10 here are the pedaling frequency data of the foot, which is combined with its torque data, vehicle speed data, etc. to the vehicle control system. The vehicle control system better controls the torque and speed of the motor according to the various riding perception data provided by these sensors to meet the replacement of intelligent riding comfort, which is the so-called human-vehicle integrated riding experience.

[0084] In some embodiments, see Figure 15, the torque sensing device 100 further includes a right bowl member 81, a right bearing 82, and a first circlip 83. The right bearing 82 is sleeved outside the right end of the shaft rod 10. The inner ring of the right bearing 82 is fixedly connected to the outer surface of the shaft rod 10, and the outer ring of the right bearing 82 is connected with the right bowl member 81 in a clearance fit. A first step 13 and a circlip groove are provided on the shaft rod 10. 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 circlip 83. The first circlip 83 is arranged in the circlip groove at the right end of the shaft rod 10. The cooperation of the first step 13 and the first circlip 83 restricts the axial movement of the right bearing 82 along the shaft rod 10, ensuring the stability of the product. In some embodiments, the first circlip 83 can also be removed, and the inner ring of the right bearing 82 is in a tight fit with the shaft rod 10.

[0085] Please refer to Figure 3 , Figure 16 , the torque sensor 100 further includes a signal output line 101. The fixed housing 25 is provided with a wire outlet hole 21 or a wire outlet groove, and the signal output line 101 passes through the wire outlet hole 21 or the wire outlet groove.

[0086] Please refer to in combination Figure 16 and Figure 17 , Figure 16 is a schematic structural diagram of the fixed housing 25 in the torque sensor 100 according to an embodiment of the present application, Figure 17 is a schematic structural diagram of the right bowl member 81 in the torque sensor 100 according to an embodiment of the present application. The fixed housing 25 is provided with anti-rotation ribs 22, and the anti-rotation ribs 22 extend along the axial direction of the shaft rod 10. An anti-rotation groove 811 is provided on the right bowl member 81, and the anti-rotation ribs 22 are located in the anti-rotation groove 811. Through the cooperation of the anti-rotation ribs 22 and the anti-rotation groove 811, it is avoided that the rotation of the fixed housing 25 causes the signal output line 101 to rotate and break or damage the signal output line, resulting in the product being unable to work properly.

[0087] Please refer to again Figure 3 , Figure 15 , the torque sensor 100 further includes a left bowl member 91, a left bearing 92, and a second circlip 93. The left bearing 92 is sleeved outside the left end of the shaft rod 10. The inner ring of the left bearing 92 is connected to the outer surface of the shaft rod 10, and the outer ring of the left bearing 92 is connected with the left bowl member 91 in a clearance fit. One side (left side) of the left bearing 92 abuts against the second circlip 93. The second circlip 93 is arranged in the circlip groove at the left end of the shaft rod 10. Second steps 23 are provided at both ends of the fixed housing 25, and the second steps 23 are respectively arranged inside the outer rings of the left bearing 92 and the right bearing 82, thereby fixing the radial movement of the fixed housing 25. The cooperation of the fixed housing 25 and the second circlip 93 restricts the axial movement of the left bearing 92 along the shaft rod 10.

[0088] In some embodiments, the main core technology can not only provide an application of a torque sensor device for a common BB bottom bracket structure of an electric bicycle, but also apply the core technology to an internal torque sensor device of a mid-drive motor of an electric bicycle.

[0089] In addition, the present invention also provides a bicycle, including the torque sensor 100 as described above. The specific structure of the torque sensor 100 refers to the above embodiments. Since the bicycle adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. Those skilled in the art can understand that the bicycle described here includes a bicycle that uses pedals for manual transmission, and does not exclude a bicycle assisted by a motor.

[0090] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A torque sensor, characterized in that: The torque sensor comprises a shaft, a housing structure, a primary control circuit unit, a secondary control circuit unit and at least one first deformation sensor; The primary control circuit unit is arranged in the housing structure; wireless signal transmission is performed between the primary control circuit unit and the secondary control circuit unit, and the primary control circuit unit provides electric energy to the secondary control circuit unit in a wireless manner; The secondary control circuit unit is arranged outside the shaft, and the secondary control circuit unit is electrically connected to the first deformation sensor; The first deformation sensor is arranged on the surface of the shaft rod and is fixedly connected to the shaft rod; The end face of the shaft rod is taken as the reference plane, the line between the center of the shaft rod mounting hole of the crank and the center of the pedal mounting hole is extended as the reference line, the line between the center point of the first deformation sensor and the center point of the end face of the shaft rod is the first line, and the first line is parallel, perpendicular or at an angle of 45° to the reference line.

2. The torque sensor according to claim 1, characterized in that: The angle between the first connecting line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°.

3. The torque sensor according to claim 1, characterized in that: The shaft is provided with a crank assembly mark, and the crank assembly mark is used to indicate the assembly direction of the crank; the assembly direction of the crank is the direction in which the shaft mounting hole of the crank points to the pedal mounting hole.

4. The torque sensor according to claim 1, characterized in that: The torque sensor also includes at least one second deformation sensor, the line between the center point of the second deformation sensor and the center point of the end face of the shaft rod is the second line, and the angle between the second line and the baseline is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

5. The torque sensor according to claim 4, characterized in that: The torque sensor also includes a right bearing and a left bearing, and the right bearing and the left bearing are sleeved at both ends of the shaft stick. The first deformation sensor and / or the second deformation sensor is located between the left bearing and the right bearing of the shaft stick.

6. The torque sensor according to claim 1, characterized in that: The number of the first deformation sensors is two, and the two first deformation sensors are symmetrically arranged.

7. The torque sensor according to claim 1, characterized in that: The outer surface of the shaft rod is provided with a mounting plane, and the mounting plane is used to mount the first deformation sensor.

8. The torque sensor according to claim 1, characterized in that: The secondary control circuit unit includes a secondary data processing circuit and a secondary coil, and the secondary data processing circuit is electrically connected to the secondary coil; the primary control circuit unit includes a primary data processing circuit and a primary coil, and the primary data processing circuit is electrically connected to the primary coil; the primary data processing circuit provides electrical energy to the secondary data processing circuit through the primary coil and the secondary coil.

9. The torque sensor according to claim 8, characterized in that: The secondary control circuit unit transmits a wireless signal to the primary control circuit unit in a wireless manner by modulating a carrier signal with a wireless signal through the primary coil and the secondary coil, or the primary data processing circuit and the secondary data processing circuit are respectively electrically connected to a secondary coil, and the secondary data processing circuit transmits a torque signal to the primary data processing circuit in a wireless signal manner through the secondary coil.

10. The torque sensor according to claim 8, characterized in that: The secondary control circuit unit includes an infrared emitting element, and the primary control circuit unit 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 wireless signals to the primary data processing circuit via the infrared emitting element and the infrared receiving element.

11. The torque sensor according to claim 8, characterized in that: The secondary control circuit unit also includes a secondary protective cover, which is sleeved on the outside of the shaft, and an installation cavity is formed between the secondary protective cover and the outer surface of the shaft, and the secondary data processing circuit and the secondary coil are located in the installation cavity.

12. The torque sensor according to claim 8, characterized in that: The torque sensor further includes a shielding plate, which is disposed between the shaft and the secondary coil; and / or the shielding plate is disposed on a shell structure outside the primary coil.

13. A bicycle, characterized in that: The bicycle comprises the torque sensor according to any one of claims 1 to 12.

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