Torque sensing device and electric bicycle

Abstract

The invention discloses a torque sensing device and an electric bicycle. The torque sensing device 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 shaft roller is sleeved with the secondary control circuit unit, the secondary control circuit unit is fixedly connected with the secondary control circuit unit, and the secondary control circuit unit is electrically connected with the first deformation sensor; the primary control circuit unit is fixedly connected with the shell structure, wireless signal transmission is carried out between the primary control circuit unit and the secondary control circuit unit, and the primary control circuit unit provides electric energy for the secondary control circuit unit in a wireless mode; the shaft roller is provided with a crank assembling mark which is used for indicating the assembling direction of the crank. The assembling direction of the crank is the direction from a shaft roller mounting hole of the crank to a pedal mounting hole; and the first deformation sensor is fixedly connected with the shaft roller.

Description

Technical Field

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

[0002] In the field of electric 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 sensors), in the prior art, mostly a metal sleeve is provided on the shaft rod as a necessary accessory for torque induction, and this metal sleeve is directly or indirectly connected to the sprocket. In this way, whether it is the pedaling force of the left foot or the right foot, it is transmitted to the sprocket 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 sprockets (the sprockets need to be specially customized), which greatly increases material costs, assembly complexity, after-sales difficulty, and so on. Summary of the Invention

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

[0004] To achieve the above object, the torque sensing device proposed by the present invention includes a shaft rod, 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 outside the shaft rod and fixedly connected, and the secondary control circuit unit is electrically connected to the first deformation sensor; the primary control circuit unit is fixedly connected to the housing structure, wireless signal transmission is carried out 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 shaft rod 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 rod mounting hole of the crank points to the pedal mounting hole; the first deformation sensor is fixedly connected to the shaft rod.

[0006] Optionally, with the end face of the shaft rod as the reference plane, and with the connection line between the center of the shaft rod mounting hole of the crank and the center of the pedal mounting hole and extended as the reference line, the connection 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 connection line, and the included angle between the first connection line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

[0007] 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 rod 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°, or 315°.

[0008] Optionally, the torque sensing device further includes a right bearing and a left bearing. The right bearing and the left bearing are sleeved at both ends of the shaft rod, and the first deformation sensor and / or the second deformation sensor is / are located between the left bearing and the right bearing of the shaft rod.

[0009] Optionally, the number of the first deformation sensors is two, and the two first deformation sensors are symmetrically arranged.

[0010] Optionally, an installation plane is provided on the outer surface of the shaft rod, and the installation plane is used for installing the first deformation sensor.

[0011] 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 rod; 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.

[0012] Optionally, the secondary control circuit unit performs wireless signal transmission with the primary control circuit unit in a wireless manner through the primary coil and the secondary coil. Alternatively, the secondary control circuit unit further includes an infrared transmitting element, and the primary control circuit unit further includes an infrared receiving element. The infrared transmitting 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 performs wireless signal transmission to the primary data processing circuit through the infrared transmitting element and the infrared receiving element.

[0013] 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.

[0014] Optionally, the torque sensing device further includes a shielding sheet disposed between the shaft rod and the secondary coil; and / or, the shielding sheet is disposed on the housing structure outside the primary coil. Additionally, the present application also provides an electric bicycle, which includes the torque sensing device as described above. This torque sensing device can be a torque sensor device with a common BB bottom bracket structure and can also be applied inside the mid-drive motor of the electric bicycle.

[0015] 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 torque of the left and right feet by sensing the bending force, shear force or resultant force of the shaft rod. Compared with the solution of sensing by a metal sleeve, the volume of the first deformation sensor is smaller, and the chainring 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 sensing device can be improved, thereby improving the sensing accuracy of the torque sensing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a related schematic diagram of the existing torque sensing device;

[0018] Figure 2 It is a structural schematic diagram of the torque sensing device according to an embodiment of the present application;

[0019] Figure 3 It is an exploded schematic diagram of the torque sensing device according to an embodiment of the present application;

[0020] Figure 4 It is a cross-sectional schematic diagram of the torque sensing device according to an embodiment of the present application;

[0021] Figure 5 It is an assembly schematic diagram of the torque sensing device and the crank according to an embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of two assembly angle directions of the crank and the shaft rod according to an embodiment of the present application;

[0023] Figure 7 is Figure 5 a schematic diagram of the structure from another perspective;

[0024] Figure 8This is a structural schematic diagram of the crank and the first deformation sensor subjected to force at the shaft installation angle according to an embodiment of the present application;

[0025] Figure 9 This is a schematic diagram of the force of the first deformation sensor according to an embodiment of the present application;

[0026] Figure 10 A schematic diagram of the resultant force of a torque sensor device under the conditions of pedal force and chain tension in one embodiment of the present application;

[0027] Figure 11 This is a schematic diagram showing an example of the positional relationship between the first connecting line and the reference line in one embodiment of the present application;

[0028] Figure 12 This is a schematic diagram of the positions of the first deformation sensor and the second deformation sensor on the surface of the shaft according to an embodiment of the present application;

[0029] Figure 13 This is a schematic diagram of the assembly of the first deformation sensor and the shaft rod according to an embodiment of the present application;

[0030] Figure 14 for Figure 4 The enlarged schematic diagram of point A in the middle;

[0031] Figure 15 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0032] Figure 16 This is a schematic diagram of the structure of a fixed housing in a torque sensor device according to an embodiment of the present application;

[0033] Figure 17 This is a schematic structural diagram of the right bowl member in the torque sensing device according to an embodiment of the present application.

[0034] Description of Figure Numbers:

[0035]

[0036]

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] 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 attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying 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, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. 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.

[0042] 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 is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0043] For the convenience of description, features representing spaces such as grooves, holes, and cavities are marked with lead wires with arrows in the attached drawings, and solid structure features are marked with lead wires without arrows in the attached drawings.

[0044] To better elaborate the technical solution of the present application, the related technical solutions of existing products are specifically introduced for illustration. Figure 1It is a related schematic diagram of an existing torque sensing device. In the existing torque sensing device, the torque sensing device 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 torques of the left and right feet by sensing the deformation of the metal sleeve 200.

[0045] However, in the above existing torque sensing device, since the metal sleeve 200 is directly or indirectly ( Figure 1 directly connected to the crank) connected to the sprocket 400, it is not universal for the traditional bicycle sprocket 400. The sprocket 400 needs to be specially customized. 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, greatly increasing the cost, after-sales difficulty and assembly complexity.

[0046] To solve the above problems, the present invention provides a torque sensing device 100. In one embodiment, as Figures 2 to 5 shown, Figure 2 is a structural schematic diagram of the torque sensing device 100 according to an embodiment of the present application, Figure 3 is an exploded schematic diagram of the torque sensing device 100 according to an embodiment of the present application, Figure 4 is a cross-sectional schematic diagram of the torque sensing device according to an embodiment of the present application, Figure 5 is an assembly schematic diagram of the torque sensing device 100 and the crank according to an embodiment of the present application.

[0047] The torque sensing device 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 FIG. (a) therein, the crank assembly mark 11 is an arrow. By indicating the assembly direction of the crank 300 through the arrow, 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, realizing 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. AsFigure 2 As 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. The special structure at both ends of the shaft rod ensures the angular consistency between the assembly direction of the crank and the patch position of the first deformation sensor 51 on the shaft rod 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 rod to form a plane extending along the axial direction of the shaft rod 10.

[0048] The shapes of both ends of the shaft rod 10 are not limited. As Figure 2 shown in Figures (a) and (b), the shapes of both ends of the shaft rod 10 are square structures. As Figure 2 shown in Figures (c) and (d), the shapes of both ends of the shaft rod 10 are spline structures. The crank assembly identification 11 is arranged at different positions at both ends of the shaft rod 10 according to the different structures of the matching crank. The key is to enable simple and convenient identification of the assembly direction of the crank when the customer assembles the crank 300. See Figure 2 .

[0049] Specifically, the shaft rod 10 can be provided with the 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 the crank assembly identification 11 at both ends of the shaft rod 10 to respectively indicate the assembly directions of the left crank 301 and the right crank 302.

[0050] Please refer to Figure 6 , Figure 6 which is a schematic diagram of two assembly angle directions between the crank and the shaft rod according to an embodiment of the present application. The shaft rod assembly hole 303 of the crank 300 is a square hole. The connection line between the center point of the shaft rod assembly hole 303 of the crank 300 and the center point of the pedal hole 304 extends towards both ends, which is called the crank direction extension line ( Figure 6 the dotted line in the figure). As Figure 6 shown in Figure (a) of the figure, 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 rod 10 is in the form of a point or a line on the pedal side of the shaft rod 10, or uses an arrow at the end face of the shaft rod to indicate the pedal orientation of the crank (the crank assembly identification 11 of the shaft rod 10 points to the pedal direction of the crank 300, as Figure 5 and Figure 7 ), 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) of the figure, 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 rod 10 is in the form of a point or a line on the pedal side of the shaft rod 10, or uses an arrow at the end face of the shaft rod to indicate the pedal orientation of the crank, as Figure 5 and Figure 7), to facilitate the customer to identify the assembly angle of the crank during crank assembly. Above Figure 6 In FIGS. (a) and (b) in the middle figure, the angles of the two most commonly used square holes of the shaft assembly hole 303 of the crank 300 are shown. 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.

[0051] Please refer to Figure 8 , Figure 8 is Figure 5 A structural schematic diagram from another perspective. 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, the first deformation sensors 51 are pasted on the surface of the shaft 10 through 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 forms a certain angle with the reference line. The angle is usually set to be relatively beneficial at 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°. The crank assembly mark can be parallel to the reference line, and the first connection line forms a certain angle with 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 more accurate foot force perception.

[0052] Specifically, as Figure 8 and Figure 9 shown, the torque sensor device further includes a left bearing 92 and a right bearing 82. 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 angle between the first connection line and the reference line is 90°. When the left crank 302 rotates downward under pedaling, the left bearing 92 serves as a fulcrum. Here, the shaft receives an upward force F1, and the right bearing 82 serves as a force-receiving fixing part. Here, the shaft receives a downward force F2. At this time, the middle of the shaft 10 arches upward slightly and deforms. The first deformation sensor 51 senses the magnitude of the torque of the foot pedaling by sensing the magnitude of the bending of the shaft 10.

[0053] As Figure 10 shown, during riding, when the right crank is pedaled 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. The pulling force of the chain will cause the shaft 10 to bend forward. 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.

[0054] 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.

[0055] And by setting the crank assembly mark 11 to indicate the assembly direction of the crank 300, and in combination with the first line formed by the first deformation sensor 51 and the shaft 10, a certain angle is formed between the first deformation sensor 51 and the reference line, and 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 10, and can improve the consistency of the torque perception of the torque sensing device 100, thereby improving the sensing accuracy of the torque sensing device 100. It can better meet the consistency of the foot pedaling force perception data of the mass-produced products of customers during riding, and improve the riding experience of each terminal customer.

[0056] The secondary control circuit unit 40 is arranged 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 secondary control circuit unit 40 transmits 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.

[0057] like Figure 11 As shown, Figure 11Schematic diagram of the positional relationship between the first connection line and the reference line in an embodiment of the present application. Taking the right end face of the shaft rod 10 as the reference plane, and the connection line between the center of the shaft rod mounting hole 303 of the crank 300 and the center of the pedal mounting hole 304 as the reference line, the connection line between the center point of the first deformation sensor 51 and the center point of the shaft rod end face is the first connection line, and there is a certain angle between the first connection line and the reference line. Figure 11 For example, it is 45°. Figure 11 In the crank assembly mark 11, the arrow is the arrow on the right end face of the shaft rod, pointing to the assembly direction of the right crank 302. Figure 10 In figure (b), Figure 10 The crank graphic in figure (a) is removed to facilitate observation and description.

[0058] In some embodiments, two first deformation sensors 51 are used, and these two first deformation sensors 51 are symmetrically arranged with respect to the axis line of the shaft rod. The two deformation sensors are usually a full-bridge circuit in the circuit components, 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.

[0059] In some embodiments, the torque sensing device 100 further includes at least one second deformation sensor 52. Taking the end face of the shaft rod as the reference plane, and the connection line between 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 connection line between the center point of the second deformation sensor and the center point of the shaft rod end face is the second connection line, and there is a certain angle between the second connection line and the reference line. The angle is usually set to 0°, 45°, 90°, 135°, 180°, 225°, 270° or 315°. Generally, one of the first deformation sensor 51 and the second deformation sensor 52 is used to sense the downward force of the foot stepping (the upward bending size in the middle part of the shaft rod), and the other is used to sense the backward pulling force generated by the chain due to the stepping force (the bending size in the middle part of the shaft rod towards the front of the whole vehicle).

[0060] In some embodiments, please refer to Figure 12 , Figure 12 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 sensing device 100 of an embodiment of the present application. The positions of the first deformation sensor 51 and the second deformation sensor 52 are usually set in a parallel or perpendicular relationship, so as to compare and sense the downward force of the foot stepping and the backward pulling force generated by the chain, because the downward force of the foot stepping and the backward pulling force generated by the chain are close to 90 degrees. As Figure 12 shown in figure (a), the first connection line is perpendicular to the second connection line. As Figure 12As shown in Figure (b), the first connection line is parallel to the second connection line. The first deformation sensor 51 is used to sense the bending deformation of the shaft rod 10 in the up-and-down direction in the horizontal direction during the process of pedaling 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 cycling. By combining the data sensed by the first deformation sensor 51 and the second deformation sensor 52, the torque sensing accuracy of the torque sensing device 100 can be improved and false judgment of real pedaling and cycling behaviors can be avoided. When the user pedals the pedal and the chain rotates, a torque signal with a changing pedaling force magnitude should be output. When the user only pedals the pedal without rotating the chain, the torque does not change. In this way, the real pedaling force data of the rider can be sensed more realistically.

[0061] 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 components, 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.

[0062] Please refer to Figure 13 , an installation plane 12 is provided on the outer surface of the shaft rod 10. 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 sensing device 100 is more convenient for operation and the structure is more compact.

[0063] As Figure 13 shown in Figure (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 Figure (b), the first deformation sensor 51 can also be installed on the installation plane 12 provided on the shaft rod 10.

[0064] 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 adhere 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.

[0065] Please refer to in combination Figure 3 , Figure 4 , Figure 14 and Figure 15 , Figure 14 is Figure 4 the enlarged schematic diagram of the A position inFigure 15 is Figure 4 An enlarged schematic view of position B in [description of the overall device]. 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 through glue.

[0066] 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 through glue to achieve the fixation of the primary data processing circuit 31. The primary data processing circuit 31 provides electrical energy to the secondary data processing circuit 41 in a wireless manner through the primary coil 32 and the secondary coil 42.

[0067] The secondary data processing circuit 41 transmits a wireless signal to the primary data processing circuit 31 in a wireless manner by modulating a carrier signal with the primary coil 32 and the secondary coil 42, or the primary data processing circuit 31 is further electrically connected to a coil, and the secondary data processing circuit 41 is also electrically connected to a coil. The secondary data processing circuit 41 transmits a torque signal to the primary data processing circuit 3 through the additional set of coils of the primary and secondary data processing circuits in a wireless signal manner.

[0068] Alternatively, the torque sensing device 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 a signal 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 advantages such as better transmission stability and strong anti-interference ability, and can effectively improve the quality of data transmission.

[0069] 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 to protect the secondary data processing circuit 41 and the secondary coil 42, it is avoided that the secondary data processing circuit 41 and the secondary coil 42 are 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-seismic buffering performance of the secondary data processing circuit 41 and the secondary coil 42 can also be improved.

[0070] 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 bearing can also be used to limit the step.

[0071] Please refer to Figure 3 and Figure 4 , the housing structure 20 includes an installation housing 24 and a fixed housing 25. The installation housing 24 is fixedly connected to the fixed housing 25. Specifically, the installation housing 24 and the fixed housing 25 can be fixedly connected by glue. The primary data processing circuit 31 and the primary coil 32 are both fixedly connected to the installation housing 24 to achieve the installation and fixation of the primary data processing circuit 31 and the primary coil 32. Then, the installation housing 24 with the primary data processing circuit 31, the primary coil 32, and the signal output line 101 fixed thereon is installed in the fixed housing 25. Finally, sealant can be filled in the extra space between the installation housing 24 and the fixed housing 25 to achieve sealing and waterproofing of the primary data processing circuit 31 and also improve the anti-seismic buffering performance of the primary control circuit unit.

[0072] In some embodiments, please refer to Figure 15 , the torque sensing device 100 further includes a shielding sheet 60. The shielding sheet 60 is disposed between the shaft rod 10 and the secondary coil 42; and / or, the shielding sheet 60 is disposed on the installation 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.

[0073] In some embodiments, please refer to Figure 3 , Figure 14 , the torque sensing device 100 further includes a speed sensor 70. The speed sensor 70 includes a speed sensing element 71 and a speed sensed element 72. The speed sensed element 72 is fixedly connected to the shaft rod 10. The speed sensing element 71 is electrically connected to the primary data processing circuit 31. The speed sensing element 71 and the speed sensed element 72 are disposed opposite to each other.

[0074] The speed sensing element 72 can be a ferromagnetic material body, 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 shaft 10 is judged by measuring the change in magnetic flux of the speed sensing element 72. Here, there are two Hall elements. The forward and reverse rotation of the shaft 10 can be judged by the sequence of the magnetic poles on the surface of the magnetic ring 72 fixed on the shaft 10. The speed and direction of the shaft 10 are the pedal frequency data of the foot stepping. Combined with its torque data, vehicle speed data, etc., it is given to the vehicle control system. The vehicle control system better controls the torque and speed of the motor according to various riding perception data provided by these sensors to meet the intelligent riding comfort of replacement, that is, the so-called riding feeling of integrating man and vehicle.

[0075] In some embodiments, please refer to Figure 15 , the torque sensing device 100 further includes a right bowl member 81, a right bearing 82 and a first snap ring 83. The right bearing 82 is sleeved outside the right end of the shaft 10. The inner ring of the right bearing 82 is fixedly connected to the outer surface of the shaft 10. 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 snap ring groove are provided on the shaft 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 snap ring 83. The first snap ring 83 is arranged in the snap ring groove at the right end of the shaft (the first snap ring 83 is not necessary either. The inner ring of the right bearing 82 and the shaft 10 can be tightly fitted. With the first snap ring 83, it can limit the rightward movement of the right bearing 82 and better ensure the stability of the product). The axial movement of the right bearing 82 along the shaft 10 is restricted by the cooperation of the first step 13 and the first snap ring 83.

[0076] Please refer to Figure 3 , Figure 16 , the torque sensing device 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.

[0077] Please refer to Figure 16 and Figure 17 , Figure 16 is a schematic structural diagram of the fixed housing 25 in the torque sensing device 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 sensing device 100 according to an embodiment of the present application. The fixed housing 25 is provided with an anti-rotation rib 22, and the anti-rotation rib 22 extends along the axial direction of the shaft 10. An anti-rotation groove 811 is provided on the right bowl member 81, and the anti-rotation rib 22 is located in the anti-rotation groove 811. Through the cooperation of the anti-rotation rib 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.

[0078] Please refer to again Figure 3 and Figure 15 The torque sensing device 100 further includes a left bowl member 91, a left bearing 92 and a second snap ring 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 snap ring 93. The second snap ring 93 is arranged in the snap ring groove at the left end of the shaft rod 10. Second steps 23 are arranged 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, so as to fix the radial movement of the fixed housing 25. The cooperation of the fixed housing 25 and the second snap ring 93 restricts the axial movement of the left bearing 92 along the shaft rod 10.

[0079] In some embodiments, in addition to providing a torque sensor device application for the common BB bottom bracket structure of an electric bicycle, the main core technology can also be applied to the internal torque sensor device of the mid-drive motor of an electric bicycle.

[0080] In addition, the present invention also provides an electric bicycle, including the torque sensing device 100 as described above. The specific structure of the torque sensing device 100 refers to the above embodiments. Since the electric 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 here one by one.

[0081] 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 to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A torque sensing device, characterized in that: The torque sensing device comprises a shaft, a housing structure, a primary control circuit unit, a secondary control circuit unit and at least one first deformation sensor, wherein the secondary control circuit unit is sleeved outside the shaft and fixedly connected, and the secondary control circuit unit is electrically connected to the first deformation sensor; The primary control circuit unit is fixedly connected to 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 to the secondary control circuit unit in a wireless manner; 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; the first deformation sensor is fixedly connected to the shaft.

2. The torque sensor device according to claim 1, characterized in that: The end face of the shaft is taken as a reference plane, the line between the center of the shaft mounting hole of the crank and the center of the pedal mounting hole is extended as a reference line, the line between the center point of the first deformation sensor and the center point of the end face of the shaft is taken as a first line, and the angle between the first line and the reference line is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°.

3. The torque sensor device according to claim 2, characterized in that: The torque sensing device 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°.

4. The torque sensor device according to claim 3, characterized in that: The torque sensing device 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.

5. The torque sensor device 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.

6. The torque sensor device 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.

7. The torque sensor device according to claim 1, characterized in that: 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 shell structure; the primary data processing circuit provides electrical energy to the secondary data processing circuit through the primary coil and the secondary coil; the secondary data processing circuit performs wireless signal transmission with the primary data processing circuit through the primary coil and the secondary coil.

8. The torque sensor device according to claim 7, characterized in that: The secondary control circuit unit also includes an infrared emitting element, and the primary control circuit unit also 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.

9. The torque sensor device according to claim 7 or 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.

10. The torque sensor device according to claim 7 or 8, characterized in that: The torque sensing device also includes a shielding plate, which is arranged between the shaft and the secondary coil; and / or the shielding plate is arranged on the outer shell structure outside the primary coil.

11. The torque sensor device according to claim 1, characterized in that: The torque sensing device also includes a speed sensor, which includes a speed sensing element and a speed sensed element. The speed sensed element is fixedly connected to the shaft rod, the speed sensing element is electrically connected to the primary data processing circuit, and the speed sensing element and the speed sensed element are arranged relative to each other.

12. The torque sensor device according to claim 1, characterized in that: The speed sensed element is a ferromagnetic material body, and the speed sensing element is at least one Hall element.

13. An electric bicycle, characterized in that: The electric bicycle comprises a torque sensing device as described in any one of claims 1 to 10.

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