Torque and speed sensing device and electric bicycle

Abstract

The present invention discloses a torque and speed sensing device and an electric bicycle. The torque and speed sensing device includes a bottom bracket spindle, a connecting piece, a deformable piece, a mounting bracket, a signal processing circuit board, a speed sensor, a permanent magnet and a torque sensor. The bottom bracket spindle is rotatably arranged in the bottom bracket tube, and an induction tooth part is arranged on the outer wall of the bottom bracket spindle. The connecting piece is sleeved on the outer periphery of the bottom bracket spindle. The speed sensor is installed on the signal processing circuit board and is arranged opposite to the induction tooth part. Compared with the existing torque and speed sensors, by arranging the induction tooth part on the bottom bracket spindle, on the one hand, the machining of the teeth is simpler, reducing the machining difficulty. On the other hand, the tooth density can be set higher, which is beneficial to improving the induction accuracy of the speed sensor. At the same time, since the permanent magnet is installed on the mounting bracket and far away from the deformable piece, the magnetization influence of the permanent magnet on the deformable piece can be reduced, and the interference to the torque sensor can be reduced, which is beneficial to improving the induction accuracy of the torque sensor.

Description

Technical Field

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

[0002] In the related art, the hub motor drive system has a certain market in the assisted electric bicycle industry due to its price advantage and simple modification. How to match the power drive of the hub motor with human power to enable users to obtain a comfortable riding experience has always been the goal pursued by practitioners in the assisted electric bicycle industry, and the signal acquisition of human power is crucial for the basis of drive control. One of the advantages of the electric bicycle hub motor is that it has little modification to the traditional bicycle and is easy to modify. At the same time, the earliest place where the power of the left and right pedals of the traditional bicycle converges is on the bottom bracket. Therefore, how to achieve signal acquisition in the space where the bottom bracket of the traditional bicycle is installed and minimize the modification to the traditional bicycle is one of the difficulties in the design of the drive components of the assisted electric bicycle.

[0003] Currently, for the existing products on the market, the scheme for speed and steering induction is to install a radially magnetized speed magnetic ring on the bottom bracket, and a speed sensor is placed at the corresponding position of the magnetic ring. When the bottom bracket rotates under force, it drives the speed magnetic ring to rotate synchronously, and the speed sensor senses the magnetic field change during the rotation of the speed magnetic ring to judge the rotation speed and steering of the bottom bracket. The problems of this scheme are as follows: 1. The more pole pairs the speed magnetic ring has, the higher the accuracy. However, the space diameter is relatively small, and the magnetizing width is limited, resulting in generally only 16 pole pairs. 2. The induction of the torque sensor relies on electricity or magnetism. The speed magnetic ring has a magnetic field, and it is close to the deformable part, which is likely to interfere with the signal of the torque sensor and reduce the accuracy of the torque sensor. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a torque and speed sensing device with high induction accuracy.

[0005] The present invention further provides an electric bicycle having the above torque and speed sensing device.

[0006] The torque and speed sensing device according to the first aspect embodiment of the present invention includes:

[0007] A bottom bracket, rotatably arranged in the bottom bracket tube, an induction tooth part is arranged on the outer wall of the bottom bracket, and the induction tooth part includes a plurality of teeth evenly distributed circumferentially along the outer wall of the bottom bracket;

[0008] A connecting piece, sleeved on the outer periphery of the bottom bracket, for transmitting power to the chainring;

[0009] A deformable part, one end fixedly connected to the bottom bracket, and the other end fixedly connected to the connecting piece;

[0010] A mounting frame, fixedly disposed in the five-way pipe and sleeved on the outer circumference of the deformable member;

[0011] A signal processing circuit board is installed on the mounting frame;

[0012] A speed sensor is mounted on the signal processing circuit board and is arranged opposite to the sensing tooth portion;

[0013] A permanent magnet is installed on a side of the signal processing circuit board away from the speed sensor, and the speed sensor is used to sense the magnetic field change of the permanent magnet to transmit a speed signal to the signal processing circuit board;

[0014] The torque sensor is mounted on the mounting frame and is used to sense the deformation of the deformable member so as to transmit a torque signal to the signal processing circuit board.

[0015] The torque and speed sensor device according to the first aspect of the present invention has at least the following beneficial effects:

[0016] When the user inputs power into the middle shaft by pedaling to make the middle shaft rotate, the multiple teeth of the induction tooth part that rotates with the middle shaft can cause the magnetic field of the permanent magnet to change, and the speed sensor can sense the change of the magnetic field to generate a speed signal, and then transmit the speed signal to the signal processing circuit board for processing to obtain the rotation speed and rotation direction of the middle shaft. At the same time, when the middle shaft rotates, the power of the middle shaft is transmitted to the connecting part through the deformable part, and then transmitted to the chainring through the connecting part to drive the wheel to rotate. The deformable part will deform in the process of transmitting power. The torque sensor can sense the deformation of the deformable part and generate a torque signal, and then transmit the torque signal to the signal processing circuit board for processing to obtain the torque size of the power input to the middle shaft. The signal processing circuit board preliminarily processes the speed signal and the torque signal and sends them to the controller of the hub motor. The controller then controls the hub motor to output appropriate power to cooperate with human power to drive the vehicle, so that the user can get a comfortable riding feeling. Compared with the existing torque and speed sensors, the torque and speed sensing device sets the sensing teeth on the central axis. On the one hand, the processing of the teeth is simpler and the processing difficulty is reduced. On the other hand, the tooth density can be set higher, which is beneficial to improve the sensing accuracy of the speed sensor. At the same time, since the permanent magnet is installed on the mounting frame and away from the deformable part, the magnetization effect of the permanent magnet on the deformable part can be reduced, and the interference to the torque sensor can be reduced, which is beneficial to improve the sensing accuracy of the torque sensor.

[0017] According to some embodiments of the present invention, the torque and speed sensor device further includes a shielding member, and the shielding member is disposed on the periphery of the torque sensor.

[0018] According to some embodiments of the present invention, the outer wall of the mounting bracket is provided with protrusions at both axial ends of the torque sensor, and the shielding member is clamped between the two protrusions.

[0019] According to some embodiments of the present invention, the torque sensor includes two induction coils, and the outer wall of the mounting bracket is provided with two annular grooves, and the two induction coils are installed in the corresponding annular grooves.

[0020] According to some embodiments of the present invention, the torque sensor further includes a connecting wire, the induction coil is connected to the signal processing circuit board through the connecting wire, and the outer wall of the mounting bracket is provided with an avoidance groove for avoiding the connecting wire.

[0021] According to some embodiments of the present invention, the mounting bracket is provided with a groove, and the speed sensor is embedded in the groove.

[0022] According to some embodiments of the present invention, it further includes a first mounting seat and a second mounting seat. The first mounting seat and the second mounting seat are installed at both axial ends of the five-way pipe. The central shaft is rotatably installed on the first mounting seat through a first bearing, and the connecting member is rotatably installed on the second mounting seat through a second bearing.

[0023] According to some embodiments of the present invention, the inner wall of the first mounting seat is provided with a card slot, and the outer wall of the mounting bracket is provided with a rib. The mounting bracket is circumferentially fixed to the first mounting seat by clamping the rib in the card slot.

[0024] According to some embodiments of the present invention, the outer wall of the deformable member is provided with a boss, the outer wall of the central shaft is provided with a limiting member, and the mounting bracket is clamped between the boss and the limiting member.

[0025] According to some embodiments of the present invention, the outer wall of the central shaft is provided with a mounting tooth portion, and the inner wall of the deformable member is provided with a mating tooth portion that mates with the mounting tooth portion.

[0026] According to some embodiments of the present invention, the outer wall of the central shaft is further provided with a retaining ring, and the retaining ring is located between the mounting tooth portion and the induction tooth portion.

[0027] The electric bicycle according to the embodiment of the second aspect of the present invention includes the torque and speed sensing device according to the embodiment of the first aspect of the present invention.

[0028] The electric bicycle according to the embodiment of the second aspect of the present invention has at least the following beneficial effects:

[0029] Due to the adoption of the above-mentioned torque and speed sensing device in the electric bicycle, when the user inputs power to the bottom bracket by pedaling and the bottom bracket rotates, multiple teeth of the induction tooth part following the rotation of the bottom bracket can cause the magnetic field of the permanent magnet to change. The speed sensor can sense the change of the magnetic field to generate a speed signal, and then send the speed signal to the signal processing circuit board for processing to obtain the rotation speed and rotation direction of the bottom bracket. At the same time, when the bottom bracket rotates, the power of the bottom bracket is transmitted to the connecting part through the deformation part, and then transmitted to the chainring through the connecting part to drive the wheel to rotate. The deformation part will generate deformation during the process of transmitting power. The torque sensor can sense the deformation of the deformation part to generate a torque signal, and then send the torque signal to the signal processing circuit board for processing to obtain the torque magnitude of the power input to the bottom bracket. The signal processing circuit board preliminarily processes the speed signal and the torque signal and then sends them to the controller of the hub motor. The controller then controls the hub motor to output appropriate power to cooperate with the human power to drive the vehicle to travel, so that the user can obtain a comfortable riding experience. Compared with the existing torque and speed sensors, by setting the induction tooth part on the bottom bracket, on the one hand, the processing of the teeth is simpler, reducing the processing difficulty, and on the other hand, the tooth density can be set higher, which is beneficial to improving the induction accuracy of the speed sensor. At the same time, since the permanent magnet is installed on the mounting bracket and far away from the deformation part, the magnetization effect of the permanent magnet on the deformation part can be reduced, and the interference to the torque sensor can be reduced, which is beneficial to improving the induction accuracy of the torque sensor, and further beneficial to improving the effect of the hub motor assistance, thereby improving the comfort of the user's riding.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a cross-sectional structural schematic diagram of the torque and speed sensing device according to some embodiments of the present invention;

[0032] Figure 2 is Figure 1 the enlarged view at A in

[0033] Figure 3 is an exploded structural schematic diagram of the torque and speed sensing device according to some embodiments of the present invention;

[0034] Figure 4 is a three-dimensional structural schematic diagram of the bottom bracket according to some embodiments of the present invention;

[0035] Figure 5 is an exploded structural schematic diagram of the mounting bracket, signal processing circuit board, speed sensor and torque sensor according to some embodiments of the present invention;

[0036] Figure 6is a schematic diagram of the three-dimensional structure of the connecting piece of some embodiments of the present invention;

[0037] Figure 7 is a schematic diagram of a three-dimensional structure of a deformation member in some embodiments of the present invention;

[0038] Figure 8 It is a schematic diagram of the three-dimensional structure of the first mounting base in some embodiments of the present invention.

[0039] Reference numerals:

[0040] Central axis 100; induction tooth portion 110; mounting tooth portion 120; retaining ring 130;

[0041] Connecting member 200; matching connecting portion 210;

[0042] Deformation member 300; matching tooth portion 310; boss 320; connecting tooth portion 330;

[0043] Mounting frame 400; groove 410; rib 420; undercut structure 430; convex ring structure 440; annular groove 450; avoidance groove 460;

[0044] Signal processing circuit board 500; signal line 510;

[0045] Speed ​​sensor 600;

[0046] Permanent magnet 700;

[0047] Torque sensor 800; induction coil 810; connecting wire 820; shielding member 830;

[0048] The bottom bracket 900 ; the first mounting seat 910 ; the clamping groove 911 ; the second mounting seat 920 ; the first bearing 930 ; and the second bearing 940 . DETAILED DESCRIPTION

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0050] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In the description of the present invention, "a number of" means one or more, "a plurality of" means two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the base number, while understandings such as "above", "below", "within", etc. include the base number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0052] In the description of the present invention, unless otherwise clearly defined, words such as "set", "install", "connect", "assemble", "fit", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0053] In the related art, the in-wheel motor drive system has a certain market in the assisted electric bicycle industry due to its price advantage and simple modification. How to cooperate the power drive of the in-wheel motor with human power to enable users to obtain a comfortable riding experience has always been the goal pursued by practitioners in the assisted electric bicycle industry, and the signal acquisition of human power is crucial for the basis of drive control. One of the advantages of the in-wheel motor of an electric bicycle is that it has little modification to a traditional bicycle and is easy to modify. At the same time, the earliest place where the power of the left and right pedals of a traditional bicycle converges is on the bottom bracket. Therefore, how to achieve signal acquisition in the space where the bottom bracket of a traditional bicycle is installed and minimize the modification of the traditional bicycle is one of the difficulties in the design of the drive components of an assisted electric bicycle.

[0054] Currently, for the existing products on the market, the scheme for speed and steering induction is to install a radially magnetized speed magnetic ring on the bottom bracket, and place a speed sensor at the corresponding position of the magnetic ring. When the bottom bracket is forced to rotate, it drives the speed magnetic ring to rotate synchronously, and the speed sensor senses the magnetic field change when the speed magnetic ring rotates to judge the rotation speed and steering of the bottom bracket. The problems of this scheme are as follows: 1. The more pole pairs the speed magnetic ring has, the higher the accuracy. However, the spatial diameter is relatively small and the magnetization width is limited, resulting in generally only 16 pole pairs; 2. The induction of the torque sensor relies on electricity or magnetism. The speed magnetic ring has a magnetic field and is close to the deformable part, which is likely to interfere with the signal of the torque sensor and reduce the accuracy of the torque sensor.

[0055] To solve at least one of the above technical problems, the present invention proposes a torque and speed sensing device, which can obtain higher induction accuracy and is simpler to process.

[0056] Refer to Figures 1 to 3, A torque and speed sensing device provided by an embodiment of the first aspect of the present invention includes a central shaft 100, a connecting member 200, a deformable member 300, a mounting bracket 400, a signal processing circuit board 500, a speed sensor 600, a permanent magnet 700, and a torque sensor 800. The frame of the assisted electric bicycle is provided with a bottom bracket tube 900. The central shaft 100 is disposed within the bottom bracket tube 900 and can rotate within the bottom bracket tube 900. Both ends of the central shaft 100 are connected to the pedals. Therefore, when the user steps on the pedals, the power of stepping will be input to the central shaft 100. An induction tooth portion 110 is provided on the outer wall of the central shaft 100. The induction tooth portion 110 includes a plurality of teeth, and the plurality of teeth are circumferentially distributed along the outer wall of the central shaft 100. There is a gap between adjacent teeth.

[0057] The connecting member 200 is sleeved on the outer periphery of the central shaft 100 and is in coaxial clearance fit with the central shaft 100. The connecting member 200 is connected to the chainring and is used to transmit power to the chainring, and the chainring then drives the wheel to rotate through a transmission mechanism.

[0058] One end of the deformable member 300 is fixedly connected to the central shaft 100, and the other end is fixedly connected to the connecting member 200, which serves to transmit the power of the central shaft 100 to the connecting member 200. For example, the deformable member 300 is generally in a cylindrical structure. One end of the deformable member 300 can be sleeved and fixed on the outer wall of the central shaft 100, and the other end is in coaxial clearance fit with the central shaft 100. The connecting member 200 is sleeved and fixed on the outer wall of the other end of the deformable member 300. The deformable member 300 will be subjected to a large torque during the power transmission process and will generate a certain deformation. Therefore, the deformable member 300 can be made of a metal material with high strength and certain elasticity, such as aluminum alloy or steel.

[0059] The mounting bracket 400 is fixedly disposed within the bottom bracket tube 900, and the mounting bracket 400 is sleeved on the outer periphery of the deformable member 300. The signal processing circuit board 500 is mounted on the side of the mounting bracket 400 facing away from the central shaft 100. The signal processing circuit board 500 is provided with a signal line 510, and the signal line 510 is connected to the controller of the hub motor. The speed sensor 600 is mounted on the signal processing circuit board 500, and the speed sensor 600 is disposed opposite to the induction tooth portion 110 of the central shaft 100. The permanent magnet 700 is mounted on the side of the signal processing circuit board 500 facing away from the speed sensor 600. The speed sensor 600 is used to sense the magnetic field change of the permanent magnet 700 to transmit a speed signal to the signal processing circuit board 500. Specifically, when the central shaft 100 rotates, the induction tooth portion 110 rotates with the central shaft 100. Since the magnetic induction lines will preferentially pass through materials with high magnetic permeability, the plurality of teeth of the induction tooth portion 110 will drive the magnetic induction lines to move when rotating, thereby causing the magnetic field of the permanent magnet 700 to change, and the speed sensor 600 can sense this change and output a corresponding speed signal.

[0060] The torque sensor 800 is installed on the mounting bracket 400. The torque sensor 800 can sense the deformation of the deformable member 300 to transmit a torque signal to the signal processing circuit board 500. Specifically, the torque sensor 800 is located outside the middle position of the deformable member 300, so that the torsional deformation degree of the deformable member 300 can be sensed more sensitively.

[0061] When the user steps on the pedal, the pedal inputs power to the central shaft 100 to make the central shaft 100 rotate. Multiple teeth of the induction tooth portion 110 that rotates following the central shaft 100 can cause the magnetic field of the permanent magnet 700 to change. The speed sensor 600 can sense the change of the magnetic field to generate a speed signal, and then transmit the speed signal to the signal processing circuit board 500 for processing to obtain the rotation speed and rotation direction of the central shaft 100. At the same time, when the central shaft 100 rotates, the power of the central shaft 100 is transmitted to the connecting member 200 through the deformable member 300, and then transmitted to the chainring through the connecting member 200 to drive the wheel to rotate. The deformable member 300 will generate deformation during the process of transmitting power. The torque sensor 800 can sense the deformation of the deformable member 300 to generate a torque signal, and then transmit the torque signal to the signal processing circuit board 500 for processing to obtain the torque magnitude of the power input to the central shaft 100. The signal processing circuit board 500 preliminarily processes the speed signal and the torque signal and sends them to the controller of the hub motor. The controller then controls the hub motor to output appropriate power to cooperate with the human power to drive the vehicle to travel, so that the user can obtain a comfortable riding feeling. Compared with the existing torque and speed sensors, in this application, by arranging the induction tooth portion 110 on the central shaft 100, on the one hand, the processing of the teeth is simpler, reducing the processing difficulty, and on the other hand, the tooth density can be set higher, which is beneficial to improving the induction accuracy of the speed sensor 600. At the same time, since the permanent magnet 700 is installed on the mounting bracket 400, it can be relatively farther away from the deformable member 300 compared with the existing technology, reducing the magnetization influence of the permanent magnet 700 on the deformable member 300 and reducing the interference to the torque sensor 800, which is beneficial to improving the induction accuracy of the torque sensor 800.

[0062] It can be understood that, in order to reduce the interference of external signals to the torque sensor 800, referring to Figure 1 and Figure 5 , in some embodiments of the present invention, the speed and torque sensing device further includes a shielding member 830. The shielding member 830 covers the outer periphery of the torque sensor 800, so as to isolate the interference of external electromagnetic signals and improve the induction accuracy of the torque sensor 800. Specifically, the shielding member 830 is made of a metal material. For example, the shielding member 830 can be composed of a metal shell or a metal wire mesh, which can play a good shielding role.

[0063] It can be understood that, in order to limit the shielding member 830 on the mounting bracket 400, referring to Figure 5, in some embodiments of the present invention, two protrusions are provided on the outer wall of the mounting bracket 400. The two protrusions are located outside the axial ends of the torque sensor 800. When the shielding member 830 covers the outer periphery of the torque sensor 800, the two protrusions can play a role in restricting the axial movement of the shielding member 830, thereby preventing the shielding member 830 from axially moving, which is beneficial to improving the shielding effect of the shielding member 830 on the torque sensor 800. Of course, the structures of the two protrusions can be the same or different. For example, one protrusion is a convex ring structure 440, and the other protrusion is an inverted buckle structure 430. The side of the inverted buckle structure 430 away from the convex ring structure 440 has an inclined surface for facilitating the introduction of the shielding member 830. When installing the shielding member 830, the shielding member 830 can be moved from the inverted buckle structure 430 towards the convex ring structure 440 and sleeved on the outer periphery of the torque sensor 800. When the shielding member 830 moves between the inverted buckle structure 430 and the convex ring structure 440, the shielding member 830 will be limited by the inverted buckle structure 430 and the convex ring structure 440 and cannot move axially.

[0064] It should be noted that, in some embodiments of the present invention, referring to Figure 5 , the torque sensor 800 includes two induction coils 810. Two annular grooves 450 are provided on the outer wall of the mounting bracket 400. The two induction coils 810 are wound and installed in the corresponding annular grooves 450, so that the installation of the induction coils 810 is more firm, preventing the induction coils 810 from being easily shaken and affecting the induction accuracy of the deformation of the deformable member 300.

[0065] It can be understood that, in some embodiments of the present invention, referring to Figure 5 , the torque sensor 800 further includes a connecting wire 820. The induction coil 810 is connected to the signal processing circuit board 500 through the connecting wire 820. An avoidance groove 460 is provided on the outer wall of the mounting bracket 400. The connecting wire 820 is accommodated in the avoidance groove 460, so as to avoid the connecting wire 820 protruding from the outer wall of the mounting bracket 400, which is beneficial to improving the installation stability of the connecting wire 820 and reducing the influence of the outside on the connecting wire 820, thereby being beneficial to further improving the induction accuracy of the torque sensor 800.

[0066] It can be understood that, in some embodiments of the present invention, referring to Figure 2 , the mounting bracket 400 is provided with a groove 410. The speed sensor 600 is embedded in the groove 410, so that the speed sensor 600 and the permanent magnet 700 are closer to the induction tooth portion 110, making it easier for the magnetic field of the permanent magnet 700 to change when the induction tooth portion 110 rotates, which is beneficial to improving the induction accuracy of the speed sensor 600.

[0067] It can be understood that, in order to facilitate the installation of the central shaft 100 and the connecting member 200, in some embodiments of the present invention, referring toFigure 1 Moreover, the torque and speed sensing device further includes a first mounting seat 910, a second mounting seat 920, a first bearing 930 and a second bearing 940. The first mounting seat 910 and the second mounting seat 920 are installed at two axial ends of the bottom bracket 900. The central shaft 100 is rotatably installed in the first mounting seat 910 through the first bearing 930, and the connecting member 200 is rotatably installed in the second mounting seat 920 through the second bearing 940. Specifically, the first mounting seat 910 can be fixedly installed at one axial end of the bottom bracket 900 by means of threaded connection or interference fit, and the second mounting seat 920 can be fixedly installed at the other axial end of the bottom bracket 900 by means of threaded connection or interference fit. The first mounting seat 910 is of a hollow structure. The outer ring of the first bearing 930 is fixedly connected to the inner wall of the first mounting seat 910, and the inner ring of the first bearing 930 is sleeved and fixed on the outer wall of the central shaft 100. Therefore, the central shaft 100 can be installed in the bottom bracket 900 through the first bearing 930 and can rotate smoothly. The second mounting seat 920 is of a hollow structure. The outer ring of the second bearing 940 is fixedly connected to the inner wall of the second mounting seat 920, and the inner ring of the second bearing 940 is fixedly sleeved on the outer wall of the connecting member 200, so that the connecting member 200 can rotate smoothly through the second bearing 940.

[0068] Of course, a matching first raceway can also be provided on the outer wall of the central shaft 100 and the inner wall of the first mounting seat 910, and balls are installed in the first raceway, so that the central shaft 100 can be rotatably installed in the first mounting seat 910. Similarly, a matching second raceway can also be provided on the outer wall of the connecting member 200 and the inner wall of the second mounting seat 920, and balls are installed in the second raceway, so that the connecting member 200 can be rotatably installed in the second mounting seat 920.

[0069] It can be understood that in order to fixedly install the mounting bracket 400 circumferentially in the bottom bracket 900, refer to Figure 5 and Figure 8, in some embodiments of the present invention, a clamping groove 911 is provided on the inner wall of the first mounting seat 910, and a rib 420 is provided on the outer wall of the mounting bracket 400. Both the clamping groove 911 and the rib 420 are arranged along the axial direction of the five-way pipe 900. The mounting bracket 400 is mounted on the first mounting seat 910 by clamping the rib 420 into the clamping groove 911, so that the mounting bracket 400 can be circumferentially fixed, thereby preventing the mounting bracket 400 from rotating relative to the five-way pipe 900 and affecting the normal operation of the related components mounted thereon. Of course, multiple clamping grooves 911 can be provided, and the multiple clamping grooves 911 are arranged at intervals in the circumferential direction. Multiple ribs 420 can also be provided, and the multiple ribs 420 are arranged at intervals in the circumferential direction. Thus, by respectively clamping the multiple ribs 420 into the corresponding clamping grooves 911, the mounting bracket 400 can be more firmly circumferentially fixed within the five-way pipe 900. Of course, the mounting bracket 400 can also be fixedly connected to the inner wall of the five-way pipe 900, or the mounting bracket 400 can be fixedly connected to the second mounting seat 920.

[0070] It can be understood that, in order to axially limit the mounting bracket 400 and prevent the mounting bracket 400 from axially moving, in some embodiments of the present invention, referring to Figure 1 and Figure 7 , a boss 320 is provided on the outer wall of the end of the deformable member 300 away from the speed sensor 600, and a limiting member is mounted on the outer wall of the end of the central shaft 100 away from the torque sensor 800. The mounting bracket 400 is clamped between the boss 320 and the limiting member, so that the boss 320 and the limiting member can play a role in blocking the mounting bracket 400 and preventing the mounting bracket 400 from axially moving. Specifically, the limiting member can be a structure such as a snap ring or a bushing, which can well block the mounting bracket 400 from axially moving.

[0071] It can be understood that, in order to more reliably transmit the power of the central shaft 100 to the deformable member 300, in some embodiments of the present invention, referring to Figure 4 and Figure 7 , a mounting tooth portion 120 is provided on the outer wall of the central shaft 100. The mounting tooth portion 120 includes multiple teeth evenly distributed in the circumferential direction. A mating tooth portion 310 is provided on the inner wall of the deformable member 300 and is matched with the mounting tooth portion 120. The mating tooth portion 310 includes multiple mating teeth evenly distributed in the circumferential direction. During installation, the mating tooth portion 310 is sleeved on the outer periphery of the mounting tooth portion 120, so that the deformable member 300 is clamped and fixed on the outer wall of the central shaft 100. At the same time, through the cooperation of the teeth, the power transmission between the central shaft 100 and the deformable member 300 is more reliable, reducing the situation where the deformable member 300 slips relative to the central shaft 100 when the power is too large. Similarly, a similar structure can also be adopted between the deformable member 300 and the connecting member 200 to achieve reliable power transmission. For example, referring to Figure 6 and Figure 7, on the outer wall of one end of the deformable member 300 away from the mating tooth portion 310, a connecting tooth portion 330 is provided. On the inner wall of one end of the connecting member 200, a mating connecting portion 210 is provided. The mating connecting portion 210 is sleeved on the connecting tooth portion 330, so that the connecting member 200 is fixedly connected to the deformable member 300. At the same time, power is transmitted between the two through the cooperation of teeth, making the transmission of power more reliable.

[0072] It should be noted that, in order to prevent the deformable member 300 from moving axially, in some embodiments of the present invention, referring to Figure 1 and Figure 4 , a retaining ring 130 is further provided on the outer wall of the central shaft 100. The retaining ring 130 is located between the mounting tooth portion 120 and the sensing tooth portion 110. The retaining ring 130 can play a role in blocking the axial movement of the deformable member 300. Of course, a limiting structure such as a circlip can also be fixedly installed on the outer wall of the central shaft 100. The circlip is located on the side of the deformable member 300 away from the retaining ring 130, so as to limit the axial movement of the deformable member 300 through the cooperation of the circlip and the retaining ring 130.

[0073] The electric bicycle according to the embodiment of the second aspect of the present invention includes a frame, wheels, a hub motor, and the torque and speed sensing device according to the embodiment of the first aspect of the present invention. The frame is provided with a bottom bracket tube 900. The torque and speed sensing device is installed in the bottom bracket tube 900. The wheels are rotatably installed on the frame. The housing of the hub motor is fixedly connected to the wheels. The torque and speed sensing device sends the collected information of the rotation speed, steering and torque of the central shaft 100 to the controller. The controller controls the hub motor to output appropriate power according to the above information to cooperate with the power of the user's pedaling to drive the wheels to rotate and achieve a good boosting effect, so that the user can obtain a comfortable riding experience.

[0074] Since the electric bicycle adopts the torque and speed sensing device according to the first aspect embodiment of the present invention, when a user steps on the pedal, the pedal inputs power to the bottom bracket 100, causing the bottom bracket 100 to rotate. Multiple teeth of the induction tooth part 110 that rotates along with the bottom bracket 100 can cause the magnetic field of the permanent magnet 700 to change. The speed sensor 600 can sense the change of the magnetic field to generate a speed signal, and then send the speed signal to the signal processing circuit board 500 for processing to obtain the rotation speed and rotation direction of the bottom bracket 100. At the same time, when the bottom bracket 100 rotates, the power of the bottom bracket 100 is transmitted to the connecting piece 200 through the deformable member 300, and then transmitted to the chainring through the connecting piece 200 to drive the wheel to rotate. The deformable member 300 will deform during the process of transmitting power. The torque sensor 800 can sense the deformation of the deformable member 300 to generate a torque signal, and then send the torque signal to the signal processing circuit board 500 for processing to obtain the magnitude of the torque of the power input to the bottom bracket 100. The signal processing circuit board 500 preliminarily processes the speed signal and the torque signal and sends them to the controller of the hub motor. The controller then controls the hub motor to output appropriate power to cooperate with the human power to drive the vehicle, so that the user can obtain a comfortable riding experience. Compared with the existing torque and speed sensors, in this application, by providing the induction tooth part 110 on the bottom bracket 100, on the one hand, the processing of the teeth is simpler, reducing the processing difficulty, and on the other hand, the tooth density can be set higher, which is beneficial to improving the induction accuracy of the speed sensor 600. At the same time, since the permanent magnet 700 is installed on the mounting bracket 400 and is far from the deformable member 300, the magnetization influence of the permanent magnet 700 on the deformable member 300 can be reduced, and the interference with the torque sensor 800 can be reduced, which is beneficial to improving the induction accuracy of the torque sensor 800.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A torque and speed sensing device, characterized in that, include: A middle shaft is rotatably disposed in the five-way tube, the middle shaft is provided with an induction tooth portion, and the induction tooth portion includes a plurality of teeth uniformly distributed along the circumference of the outer wall of the middle shaft; A connecting piece, sleeved on the outer circumference of the middle shaft, for transmitting power to the crankset; A deformable member, one end of which is fixedly connected to the central axis, and the other end of which is fixedly connected to the connecting member; A mounting frame, fixedly disposed in the five-way pipe and sleeved on the outer circumference of the deformable member; A signal processing circuit board is installed on the mounting frame; A speed sensor is mounted on the signal processing circuit board and is arranged opposite to the sensing tooth portion; A permanent magnet is installed on a side of the signal processing circuit board away from the speed sensor, and the speed sensor is used to sense the magnetic field change of the permanent magnet to transmit a speed signal to the signal processing circuit board; A torque sensor, mounted on the mounting frame, for sensing the deformation of the deformable member to transmit a torque signal to the signal processing circuit board; The torque sensor includes two induction coils, the outer wall of the mounting frame is provided with two annular grooves, and the two induction coils are installed in the corresponding annular grooves; A shielding member is disposed on the outer periphery of the torque sensor.

2. The torque and speed sensing device according to claim 1, characterized in that, The outer wall of the mounting frame is provided with protrusions located at two axial ends of the torque sensor, and the shielding member is clamped between the two protrusions.

3. The torque and speed sensing device according to claim 1, wherein The torque sensor also includes a connecting wire, through which the induction coil is connected to the signal processing circuit board, and an outer wall of the mounting frame is provided with an escape groove for evading the connecting wire.

4. The torque and speed sensing device according to claim 1, characterized in that, The mounting frame is provided with a groove, and the speed sensor is embedded in the groove.

5. The torque and speed sensing device according to claim 1, characterized in that, It also includes a first mounting seat and a second mounting seat, wherein the first mounting seat and the second mounting seat are mounted on both ends of the five-way tube along the axial direction, the middle shaft is rotatably mounted on the first mounting seat through a first bearing, and the connecting member is rotatably mounted on the second mounting seat through a second bearing.

6. The torque and speed sensing device according to claim 5, wherein, The inner wall of the first mounting seat is provided with a slot, the outer wall of the mounting frame is provided with a convex rib, and the mounting frame is circumferentially fixed to the first mounting seat by the convex rib being engaged with the slot.

7. The torque and speed sensing device according to claim 6, characterized in that, The outer wall of the deformable member is provided with a boss, the outer wall of the central axis is installed with a limiting member, and the mounting frame is clamped between the boss and the limiting member.

8. The torque and speed sensing device according to claim 1, characterized in that, The outer wall of the central shaft is provided with a mounting tooth portion, and the inner wall of the deformable member is provided with a matching tooth portion matching with the mounting tooth portion.

9. The torque and speed sensing device according to claim 8, wherein The outer wall of the central shaft is further provided with a retaining ring, and the retaining ring is located between the mounting tooth portion and the sensing tooth portion.

10. An electric bicycle, characterized in that, It comprises a torque and speed sensing device as claimed in any one of claims 1 to 9.

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