Torque and speed sensing device and electric bicycle

Abstract

The application discloses a torque and speed sensing device and an electric bicycle, wherein the torque and speed sensing device comprises a middle shaft, a connecting piece, a deformation piece, a mounting rack, a signal processor, a speed sensor, a speed magnetic ring and a torque sensor, the middle shaft is rotationally arranged in a five-way pipe, the connecting piece is sleeved on the outer periphery of the middle shaft, and the speed magnetic ring is sleeved and fixed to the outer wall of the deformation piece; the torque and speed sensing device synchronizes the speed information sensed by the speed sensor with the torque information sensed by the torque sensor by sleeving and fixing the speed magnetic ring to the outer wall of the deformation piece, so that the signal processor can synchronously obtain the speed, the rotating speed and the torque information of the middle shaft, thereby sending the accurate state information of the middle shaft to the controller, and the controller can control the hub motor to output more suitable power to cooperate with the human-powered vehicle to run, thereby improving the riding comfort of the user.

Description

Technical Field

[0001] This invention relates to the field of electric bicycle technology, and in particular to a torque and speed sensing device and an electric bicycle. Background Technology

[0002] Among related technologies, hub motor drive systems hold a certain market share in the electric bicycle industry due to their price advantage and ease of modification. How to coordinate the hub motor's power drive with human power to provide a comfortable riding experience has always been a goal pursued by electric bicycle manufacturers, and the acquisition of human power signals is crucial for drive control. One advantage of hub motors in electric bicycles is their minimal modification and simplicity compared to traditional bicycles. However, the initial power from the left and right pedals on a traditional bicycle is concentrated on the bottom bracket. Therefore, achieving signal acquisition within the space of the bottom bracket while minimizing modifications to the traditional bicycle is one of the design challenges of electric bicycle drive components.

[0003] Currently, existing products on the market use a method of mounting a radially magnetized speed ring on the central shaft, with a speed sensor placed at the corresponding position. When the central shaft rotates under force, it drives the speed ring to rotate synchronously. The speed sensor detects changes in the magnetic field of the rotating speed ring to determine the central shaft's speed and direction. This method has the following problems: the speed ring is fixed to the central shaft and rotates synchronously with it; the deformable body is connected to the central shaft via a spline; the speed sensor obtains the central shaft's speed and direction data by sensing changes in the magnetic field of the speed ring; and the torque sensor obtains the central shaft's torque data by sensing the deformation of the deformable body. However, during transmission, backlash causes a transmission lag between the central shaft and the deformable body, resulting in asynchronous sensing of the central shaft's torque, speed, and direction by the speed sensor and 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. To this end, the present invention proposes a torque and speed sensing device capable of synchronously sensing the torque, rotational speed, and steering of the central shaft.

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

[0006] According to a first aspect of the present invention, a torque and velocity sensing device includes:

[0007] The central axis is rotatably mounted inside the bottom bracket.

[0008] A connector, fitted around the outer periphery of the central shaft, is used to transmit power to the gear chain;

[0009] The deformable component is fixedly connected to the central shaft at one end and to the connecting component at the other end.

[0010] A mounting frame fixedly arranged in the five-way pipe and sleeved on the outer periphery of the deformation member;

[0011] A speed magnetic ring fixedly sleeved on the outer wall of the deformation member;

[0012] A speed inductor mounted on the mounting frame and used for sensing the magnetic field change of the speed magnetic ring;

[0013] A torque inductor mounted on the mounting frame and used for sensing the deformation of the deformation member;

[0014] A signal processor in communication connection with the speed inductor and the torque inductor.

[0015] The torque and speed sensing device according to the first aspect of the present application 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 middle shaft drives the deformation member to rotate, the speed magnetic ring fixedly sleeved on the outer wall of the deformation member rotates, the speed inductor senses the magnetic field change of the speed magnetic ring to generate a speed signal, and then the speed signal is transmitted to the signal processor to obtain the rotation speed and rotation direction of the middle shaft. Meanwhile, the deformation member transmits the power of the middle shaft to the connecting member, and then the power is transmitted to the toothed disc through the connecting member to drive the wheels to rotate. The deformation member deforms in the process of transmitting the power, the torque inductor senses the deformation of the deformation member to generate a torque signal, and then the torque signal is transmitted to the signal processor for processing to obtain the torque of the power input into the middle shaft. The signal processor sends the speed signal and the torque signal to the controller of the hub motor after preliminary processing, and the controller controls the hub motor to output appropriate power to cooperate with the human-powered vehicle to travel, so that the user can obtain a comfortable riding feeling. Compared with the existing torque and speed sensor, the torque and speed sensing device synchronizes the rotation speed and rotation direction information sensed by the speed inductor with the torque information sensed by the torque inductor, so that the signal processor can synchronously obtain the speed, rotation speed and torque information of the middle shaft, thereby sending accurate state information of the middle shaft to the controller, so that the controller can control the hub motor to output more appropriate power to cooperate with the human-powered vehicle to travel, thereby improving the riding comfort of the user.

[0017] According to some embodiments of the present application, the speed inductor and the speed magnetic ring are arranged in axial opposite directions.

[0018] According to some embodiments of the present application, the outer wall of the deformation member is provided with a boss, and the speed magnetic ring abuts against the side wall of the boss.

[0019] According to some embodiments of the present application, the mounting frame is provided with a protruding ring at one end in the axial direction, and the speed sensor and the torque sensor are respectively located at two sides of the protruding ring in the axial direction.

[0020] According to some embodiments of the present application, an end surface of the protruding ring, which is away from the torque sensor, is provided with a groove, and the speed sensor is installed in the groove.

[0021] According to some embodiments of the present application, the speed sensor is provided with a circuit board which matches the shape of the inner wall of the groove, and the speed sensor is fixed to the inner wall of the groove through the circuit board.

[0022] According to some embodiments of the present application, the torque and speed sensing device further comprises a shielding member which covers the outer periphery of the torque sensor.

[0023] According to some embodiments of the present application, the outer wall of the mounting frame is provided with a protrusion, and the shielding member is clamped between the protrusion and the protruding ring.

[0024] According to some embodiments of the present application, the speed magnetic ring is an axial magnetization magnetic ring.

[0025] According to some embodiments of the present application, the torque sensor comprises two induction coils, and 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.

[0026] According to some embodiments of the present application, the torque sensor further comprises a first connecting line, and the induction coils are connected to the signal processor through the first connecting line, and the outer wall of the mounting frame is provided with a first avoiding groove for avoiding the first connecting line.

[0027] According to some embodiments of the present application, the speed sensor further comprises a second connecting line, and the speed sensor is connected to the signal processor through the second connecting line, and the outer wall of the mounting frame is provided with a second avoiding groove for avoiding the second connecting line.

[0028] The electric bicycle according to the second aspect of the embodiments of the present application comprises the torque and speed sensing device according to the first aspect of the embodiments of the present application.

[0029] The electric bicycle according to the second aspect of the embodiments of the present application has at least the following beneficial effects:

[0030] The electric bicycle adopts the torque and speed sensing device, when the user inputs power into the middle shaft by pedaling to make the middle shaft rotate, the middle shaft drives the deforming member to rotate, the speed magnetic ring fixed on the outer wall of the deforming member rotates, the speed sensor senses the magnetic field change of the speed magnetic ring to generate a speed signal, then the speed signal is transmitted to the signal processor to obtain the rotation speed and rotation direction of the middle shaft, meanwhile, the deforming member transmits the power of the middle shaft to the connecting piece, then the power is transmitted to the toothed disc through the connecting piece to drive the wheel to rotate, the deforming member deforms in the process of transmitting power, the torque sensor senses the deformation of the deforming member to generate a torque signal, then the torque signal is transmitted to the signal processor for processing to obtain the torque of the input power of the middle shaft, the signal processor sends the speed signal and the torque signal to the controller of the hub motor after preliminary processing, and the controller controls the hub motor to output appropriate power to cooperate with the human-powered vehicle to drive, so that the user can obtain comfortable riding feeling. Compared with the existing torque and speed sensor, the torque and speed sensing device is fixed on the outer wall of the deforming member through the speed magnetic ring, so that the rotation speed and rotation direction information sensed by the speed sensor can be synchronized with the torque information sensed by the torque sensor, the signal processor can obtain the speed, rotation speed and torque information of the middle shaft synchronously, so as to send the accurate state information of the middle shaft to the controller, so that the controller can control the hub motor to output more appropriate power to cooperate with the human-powered vehicle to drive, thereby improving the riding comfort of the user.

[0031] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a sectional structure schematic view of the torque and speed sensing device of some embodiments of the application;

[0033] Figure 2 is Figure 1 is an enlarged view of A in

[0034] Figure 3 is an exploded structure schematic view of the torque and speed sensing device of some embodiments of the application;

[0035] Figure 4 is a three-dimensional structure schematic view of the middle shaft of some embodiments of the application;

[0036] Figure 5 is an exploded structure schematic view of the mounting bracket, signal processor, speed sensor and torque sensor of some embodiments of the application;

[0037] Figure 6 is a three-dimensional structure schematic view of the connecting piece of some embodiments of the application;

[0038] Figure 7 is a perspective view of a deformation member of some embodiments of the present application;

[0039] Figure 8 is a perspective view of a first mounting seat of some embodiments of the present application.

[0040] Reference signs:

[0041] central shaft 100; mounting tooth portion 110; blocking ring 120;

[0042] connecting member 200; mating connecting portion 210;

[0043] deformation member 300; mating tooth portion 310; boss 320; connecting tooth portion 330;

[0044] mounting bracket 400; groove 410; convex rib 420; reverse buckle structure 430; convex ring 440; annular groove 450; first avoiding groove 460; second avoiding groove 470;

[0045] signal processor 500; signal line 510;

[0046] speed sensor 600; circuit board 610; second connecting line 620;

[0047] speed magnetic ring 700;

[0048] torque sensor 800; induction coil 810; first connecting line 820; shielding member 830;

[0049] five-way pipe 900; first mounting seat 910; clamping groove 911; second mounting seat 920; first bearing 930; second bearing 940. DETAILED DESCRIPTION

[0050] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or elements having the same or similar function. The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0051] In the description of the present application, it should be understood that, in relation to orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0052] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of indicated technical features or implying the sequence of indicated technical features.

[0053] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, assembling, fitting, etc. should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.

[0054] In the related art, the hub motor drive system has the advantages of price advantage and easy modification, and occupies a certain market in the assisted electric bicycle industry. How to coordinate the power drive of the hub motor with human power to make the user obtain comfortable riding feeling has always been the goal pursued by the practitioners of assisted electric bicycles, and the signal collection of human power is crucial to the driving control. One of the advantages of the electric bicycle hub motor is that the modification to the traditional bicycle is small and the modification is simple, and at the same time, the place where the power of the left and right pedals of the traditional bicycle converges is on the middle shaft, so how to realize signal collection in the space of the middle shaft installed in the traditional bicycle and minimize the modification of the traditional bicycle is one of the difficulties in the design of the driving part of the assisted electric bicycle.

[0055] At present, the existing products on the market adopt the following scheme for speed and steering induction: a radial magnetized speed magnetic ring is installed on the middle shaft, a speed inductor is placed at the corresponding position of the magnetic ring, the middle shaft is driven to rotate when subjected to force, the speed magnetic ring is synchronously rotated, and the speed inductor judges the speed and steering of the middle shaft by sensing the magnetic field change of the speed magnetic ring when rotating. This scheme has the following problems: the speed magnetic ring is fixed on the middle shaft and synchronously rotates with the middle shaft, the deformation body is connected with the middle shaft through spline, the speed inductor obtains the speed and steering data of the middle shaft by sensing the magnetic field change of the speed magnetic ring, and the torque inductor obtains the torque data of the middle shaft by sensing the deformation of the deformation body. However, due to the tooth side gap during transmission, the middle shaft and the deformation body have transmission lag, so that the speed inductor and the torque inductor are out of synchronization in sensing the torque, speed and steering of the middle shaft.

[0056] In order to solve at least one of the above technical problems, the present application provides a torque and speed sensing device which can synchronously sense the torque, speed and steering information of the middle shaft.

[0057] Reference Figures 1 to 3The embodiment of the first aspect of the present application provides a torque and speed sensing device, which comprises a middle shaft 100, a connecting piece 200, a deformation piece 300, a mounting bracket 400, a signal processor 500, a speed sensor 600, a speed magnetic ring 700 and a torque sensor 800.The frame of the power-assisted electric bicycle is provided with a five-way pipe 900, the middle shaft 100 is arranged in the five-way pipe 900 and can rotate in the five-way pipe 900, and the two ends of the middle shaft 100 are connected with pedals, so that the power of pedaling is input to the middle shaft 100 when a user pedals the pedals.The connecting piece 200 is sleeved on the outer periphery of the middle shaft 100 and is coaxially matched with the middle shaft 100.The connecting piece 200 is connected with a toothed disc, and is used for transmitting power to the toothed disc, and the toothed disc drives the wheels to rotate through a transmission mechanism.

[0058] One end of the deformation piece 300 is fixedly connected with the middle shaft 100, and the other end is fixedly connected with the connecting piece 200, so as to transmit the power of the middle shaft 100 to the connecting piece 200.For example, the deformation piece 300 is substantially in a cylindrical structure, one end of the deformation piece 300 is sleeved and fixed on the outer wall of the middle shaft 100, the other end is coaxially matched with the middle shaft 100, and the connecting piece 200 is sleeved and fixed on the outer wall of the other end of the deformation piece 300.The deformation piece 300 will be subjected to a large torque in the process of transmitting power, and will also be deformed to a certain extent, so the deformation piece 300 can be made of a metal material with high strength and certain elasticity, for example, can be made of aluminum alloy or steel.

[0059] The mounting bracket 400 is fixedly arranged in the five-way pipe 900, and the mounting bracket 400 is sleeved on the outer periphery of the deformation piece 300.The signal processor 500 is arranged in the five-way pipe 900, and can be mounted on the mounting bracket 400 or other components, and the signal processor 500 is provided with a signal line 510 connected with a controller of the hub motor.The main body of the signal processor 500 can be a common flat PCB board or a soft board, and the soft board can be wrapped on the outer side of the mounting bracket 400.

[0060] The speed magnetic ring 700 is sleeved and fixed on the outer wall of the deformation piece 300, so that the speed magnetic ring 700 can rotate synchronously with the deformation piece 300.The speed sensor 600 is fixedly mounted on the mounting bracket 400, and is used for sensing the magnetic field change of the speed magnetic ring 700.The speed magnetic ring 700 rotates with the deformation piece 300, and the magnetic field of the speed magnetic ring 700 changes, and the speed sensor 600 can sense the change and send a corresponding speed signal to the signal processor 500.

[0061] The torque sensor 800 is mounted on the mounting bracket 400, and the torque sensor 800 can sense the deformation of the deformation piece 300 to transmit a torque signal to the signal processor 500.Specifically, the torque sensor 800 is located outside the middle position of the deformation piece 300, so that the torque sensor 800 can more sensitively sense the degree of torsional deformation of the deformation piece 300.

[0062] When the user steps on the pedal, the pedal inputs power into the middle shaft 100 so that the middle shaft 100 rotates, the middle shaft 100 drives the deformation member 300 to rotate, so that the speed magnetic ring 700 fixedly sleeved on the outer wall of the deformation member 300 rotates, the speed sensor 600 senses the magnetic field change of the speed magnetic ring 700 to generate a speed signal, and then the speed signal is transmitted to the signal processor 500 to obtain the rotation speed and direction of the middle shaft 100, and at the same time, the deformation member 300 transmits the power of the middle shaft 100 to the connecting member 200, and then the power is transmitted to the toothed plate through the connecting member 200 to drive the wheels to rotate, and the deformation member 300 will be deformed during the transmission of the power. The torque sensor 800 can sense the deformation of the deformation member 300 to generate a torque signal, and then the torque signal is transmitted to the signal processor 500 for processing to obtain the torque of the power input into the middle shaft 100. The signal processor 500 sends the speed signal and the torque signal to the controller of the hub motor after preliminary processing, and the controller controls the hub motor to output appropriate power to cooperate with the human-powered vehicle to drive, so that the user can obtain a comfortable riding feeling. Compared with the existing torque and speed sensors, the torque and speed sensor device synchronizes the speed information sensed by the speed sensor 600 and the torque information sensed by the torque sensor 800 by sleeving the speed magnetic ring 700 on the outer wall of the deformation member 300, so that the signal processor 500 can synchronously obtain the speed, rotation speed and torque information of the middle shaft 100, thereby sending accurate state information of the middle shaft 100 to the controller, so that the controller can control the hub motor to output more appropriate power to cooperate with the human-powered vehicle to drive, thereby improving the riding comfort of the user.

[0063] It should be noted that in the prior art, the speed magnetic ring 700 is radially magnetized. Since the diameter of the speed magnetic ring 700 is small, it is difficult to magnetize, which results in low sensing accuracy of the speed sensor 600. Therefore, in some embodiments of the present application, the speed sensor 600 and the speed magnetic ring 700 are arranged in an axial direction, so that the speed magnetic ring 700 can be magnetized in the axial direction, and the axial space of the outer wall of the deformation body is relatively large. Therefore, the distance between the speed magnetic ring 700 and the speed sensor 600 in the axial direction can be adjusted as needed, so that the magnetization of the speed magnetic ring 700 is simpler, which is beneficial to improve the sensing accuracy of the speed sensor 600.

[0064] It can be understood that, in order to prevent the speed magnetic ring 700 from shaking when being installed on the deformation member 300, in some embodiments of the present application, the outer wall of the deformation member 300 is provided with a boss 320, and the speed magnetic ring 700 abuts against the side wall of the boss 320. The boss 320 can block the movement of the speed magnetic ring 700 in the axial direction, thereby reducing the shaking of the speed magnetic ring 700, and being beneficial to improve the sensing accuracy of the speed sensor 600.

[0065] It can be understood that, in order to reduce the signal interference of the speed magnetic ring 700 and the speed sensor 600 to the torque sensor 800, in some embodiments of the present application, the mounting frame 400 is provided with a convex ring 440 at one end in the axial direction, the speed sensor 600 and the torque sensor 800 are respectively located on both sides of the convex ring 440 in the axial direction, and the speed magnetic ring 700 is located on the side of the speed sensor 600 away from the torque sensor 800. By being arranged as above, the convex ring 440 can separate the torque sensor 800 from the speed sensor 600 and the speed magnetic ring 700, thereby reducing the signal interference of the speed sensor 600 and the speed magnetic ring 700 to the torque sensor 800.

[0066] It can be understood that, in order to reduce the influence of other components on the speed sensor 600, in some embodiments of the present application, the end surface of the convex ring 440 away from the torque sensor 800 is provided with a groove 410, and the speed sensor 600 is mounted in the groove 410, so that the speed sensor 600 does not protrude from the outer end surface of the convex ring 440, preventing the speed sensor 600 from being easily touched by other components and affecting its normal work, and at the same time facilitating to improve the installation stability of the speed sensor 600.

[0067] It can be understood that, in some embodiments of the present application, the speed sensor 600 is provided with a circuit board 610 matching the shape of the inner wall of the groove 410, and the speed sensor 600 is fixed to the inner wall of the groove 410 through the circuit board 610, so that the speed sensor 600 can be more stably mounted in the groove 410, avoiding the speed sensor 600 from falling off the mounting frame 400 due to vibration. Specifically, the circuit board 610 can be connected to the inner wall of the groove 410 by bolts, or can be fixed to the inner wall of the groove 410 by welding.

[0068] 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 application, the speed and torque sensing device further comprises a shielding member 830, which covers the outer periphery of the torque sensor 800, so as to isolate the external electromagnetic signal interference and improve the sensing accuracy of the torque sensor 800. Specifically, the shielding member 830 is made of metal material, for example, the shielding member 830 can be a metal shell or a metal wire mesh, which can play a good shielding effect.

[0069] It can be understood that, in order to limit the shielding member 830 on the mounting frame 400, referring to Figure 5In some embodiments of the present application, the outer wall of the mounting frame 400 is provided with a protrusion, and the shield 830 is clamped between the protrusion and the protrusion ring 440. When the shield 830 covers the outer periphery of the torque sensor 800, the protrusion and the protrusion ring 440 can limit the axial movement of the shield 830, thereby preventing the axial movement of the shield 830, and facilitating to improve the shielding effect of the shield 830 on the torque sensor 800. Specifically, the protrusion is a reverse buckle structure 430, and the side of the reverse buckle structure 430 away from the protrusion ring 440 has a slope for facilitating the introduction of the shield 830. When installing the shield 830, the shield 830 can be moved from the reverse buckle structure 430 to the direction of the protrusion ring 440 to be sleeved on the outer periphery of the torque sensor 800. When the shield 830 moves to between the reverse buckle structure 430 and the protrusion ring 440, the shield 830 will be limited by the reverse buckle structure 430 and the protrusion ring 440 and cannot move axially.

[0070] It should be noted that in some embodiments of the present application, referring to Figure 5 The torque sensor 800 includes two sensing coils 810, and the outer wall of the mounting frame 400 is provided with two annular grooves 450. The two sensing coils 810 are arranged around the corresponding annular grooves 450, so that the installation of the sensing coils 810 is more firm, and the sensing coils 810 are prevented from easily shaking and affecting the sensing precision of the deformation of the deformation member 300.

[0071] It can be understood that in some embodiments of the present application, referring to Figure 5 The torque sensor 800 further includes a first connecting line 820, and the sensing coil 810 is connected with the signal processor 500 through the first connecting line 820. The outer wall of the mounting frame 400 is provided with a first avoiding groove 460, and the first connecting line 820 is accommodated in the first avoiding groove 460, so that the first connecting line 820 can be avoided from protruding from the outer wall of the mounting frame 400, which is beneficial to improve the installation stability of the first connecting line 820 and reduce the influence of the outside on the first connecting line 820, thereby facilitating to further improve the sensing precision of the torque sensor 800.

[0072] It can be understood that, in some embodiments of the present application, the speed sensor 600 further comprises a second connecting line 620, the speed sensor 600 is connected with the signal processor 500 through the second connecting line 620, and the outer wall of the mounting frame 400 is provided with a second avoiding groove 470 for avoiding the second connecting line 620. The second avoiding groove 470 is in communication with the first avoiding groove 460 in the axial direction, so that the second connecting line 620 passes through the second avoiding groove 470 and the first avoiding groove 460 in sequence to be connected with the signal processor 500. The second connecting line 620 is accommodated in the second avoiding groove 470 and the first avoiding groove 460, so that the second connecting line 620 can be prevented from protruding from the outer wall of the mounting frame 400, which is beneficial to improve the installation stability of the second connecting line 620 and reduce the influence of the external environment on the second connecting line 620, thereby being beneficial to further improve the sensing accuracy of the speed sensor 600.

[0073] It can be understood that, in order to facilitate the installation of the middle shaft 100 and the connecting piece 200, in some embodiments of the present application, referring to Figure 1 , the torque and speed sensing device further comprises 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 the two axial ends of the five-way pipe 900. The middle shaft 100 is rotatably installed on the first mounting seat 910 through the first bearing 930. The connecting piece 200 is rotatably installed on the second mounting seat 920 through the second bearing 940. Specifically, the first mounting seat 910 can be fixedly installed on one axial end of the five-way pipe 900 by means of threaded connection or interference fit. The second mounting seat 920 can be fixedly installed on the other axial end of the five-way pipe 900 by means of threaded connection or interference fit. The first mounting seat 910 has a hollow structure. The outer ring of the first bearing 930 is fixedly connected to the inner wall of the first mounting seat 910. The inner ring of the first bearing 930 is fixedly sleeved to the outer wall of the middle shaft 100. Therefore, the middle shaft 100 can be installed in the five-way pipe 900 through the first bearing 930 and can rotate smoothly. The second mounting seat 920 has a hollow structure. The outer ring of the second bearing 940 is fixedly connected to the inner wall of the second mounting seat 920. The inner ring of the second bearing 940 is fixedly sleeved to the outer wall of the connecting piece 200, so that the connecting piece 200 can rotate smoothly through the second bearing 940.

[0074] Of course, a first raceway matched with the outer wall of the middle shaft 100 and the inner wall of the first mounting seat 910 can also be arranged, and balls are installed in the first raceway, so that the middle shaft 100 can be rotatably installed in the first mounting seat 910. Similarly, a second raceway matched with the outer wall of the connecting piece 200 and the inner wall of the second mounting seat 920 can also be arranged, and balls are installed in the second raceway, so that the connecting piece 200 can be rotatably installed in the second mounting seat 920.

[0075] It can be understood that in order to enable the mounting rack 400 to be fixedly arranged in the five-way pipe 900 in the circumferential direction, with reference to Figure 5 and Figure 8 In some embodiments of the present application, the inner wall of the first mounting seat 910 is provided with a clamping groove 911, and the outer wall of the mounting rack 400 is provided with a protruding rib 420. The clamping groove 911 and the protruding rib 420 are both arranged in the axial direction of the five-way pipe 900. The mounting rack 400 is mounted on the first mounting seat 910 by clamping the protruding rib 420 in the clamping groove 911, so that the mounting rack 400 can be fixed in the circumferential direction, thereby preventing the mounting rack 400 from rotating relative to the five-way pipe 900 and affecting the normal operation of the related components mounted thereon. Of course, the clamping groove 911 can be provided with a plurality of clamping grooves 911 arranged at intervals in the circumferential direction, and the protruding rib 420 can also be provided with a plurality of protruding ribs 420 arranged at intervals in the circumferential direction, so that the mounting rack 400 can be more stably fixed in the circumferential direction in the five-way pipe 900 by clamping a plurality of protruding ribs 420 into corresponding clamping grooves 911. Of course, the mounting rack 400 can also be fixedly connected to the inner wall of the five-way pipe 900, or the mounting rack 400 can be fixedly connected to the second mounting seat 920.

[0076] It can be understood that in order to be able to limit the mounting rack 400 in the axial direction and prevent the mounting rack 400 from moving in the axial direction, in some embodiments of the present application, with reference to Figure 1 and Figure 7 The outer wall of the central shaft 100 is provided with a limiting piece, which can block the mounting rack 400 and prevent the mounting rack 400 from moving in the axial direction. Specifically, the limiting piece can be a circlip or a shaft sleeve, which can effectively block the mounting rack 400 from moving in the axial direction.

[0077] It can be understood that in order to enable the power of the central shaft 100 to be more reliably transmitted to the deforming piece 300, in some embodiments of the present application, with reference to Figure 4 and Figure 7 The outer wall of the central shaft 100 is provided with a mounting tooth portion 110, which includes a plurality of circumferentially distributed teeth. The inner wall of the deforming piece 300 is provided with a cooperating tooth portion 310 that cooperates with the mounting tooth portion 110. The cooperating tooth portion 310 includes a plurality of circumferentially distributed cooperating teeth. During installation, the cooperating tooth portion 310 is sleeved on the outer periphery of the mounting tooth portion 110, so that the deforming piece 300 is clamped and fixed to 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 deforming piece 300 is more reliable, and the condition of the deforming piece 300 slipping relative to the central shaft 100 when the power is too large is reduced. Similarly, the deforming piece 300 and the connecting piece 200 can also adopt similar structures to achieve reliable power transmission. For example, with reference to Figure 6 and Figure 7The outer wall of the one end of the deformed part 300 away from the matching tooth part 310 is provided with a connecting tooth part 330, and the inner wall of the one end of the connecting part 200 is provided with a matching connecting part 210, the matching connecting part 210 is sleeved on the connecting tooth part 330, so that the connecting part 200 is fixedly connected to the deformed part 300, and the power is transmitted between the two through the matching of the teeth, so that the transmission of the power is more reliable.

[0078] It should be noted that, in order to prevent the deformed part 300 from moving in the axial direction, in some embodiments of the present application, referring to Figure 1 and Figure 4 The outer wall of the middle shaft 100 is further provided with a blocking ring 120, the blocking ring 120 is located on one side of the mounting tooth part 110, the blocking ring 120 can block the axial movement of the deformed part 300, of course, a clamping spring or other limiting structure can also be fixedly installed on the outer wall of the middle shaft 100, the clamping spring is located on the side of the deformed part 300 away from the blocking ring 120, so as to limit the axial movement of the deformed part 300 through the cooperation of the clamping spring and the blocking ring 120.

[0079] The electric bicycle of the second aspect embodiment of the present application comprises a frame, a wheel, a hub motor and the torque and speed sensing device of the first aspect embodiment of the present application. The frame is provided with a five-way pipe 900, the torque and speed sensing device is installed in the five-way pipe 900, the wheel is rotatably installed on the frame, and the shell of the hub motor is fixedly connected with the wheel. The torque and speed sensing device sends the collected rotation speed, steering and torque information of the middle shaft 100 to the controller, the controller controls the hub motor to output appropriate power according to the above information, so as to cooperate with the power of the user's pedaling to drive the wheel to rotate and realize good power-assisted effect, so that the user can obtain comfortable riding feeling.

[0080] The electric bicycle adopts the torque and speed sensing device of the first aspect of the present application. When the user pedals the pedal, the pedal inputs power to the middle shaft 100 to make the middle shaft 100 rotate, the middle shaft 100 drives the deforming member 300 to rotate to make the speed magnetic ring 700 fixed to the outer wall of the deforming member 300 rotate, the speed sensor 600 senses the magnetic field change of the speed magnetic ring 700 to generate a speed signal, and then the speed signal is transmitted to the signal processor 500 to obtain the rotation speed and direction of the middle shaft 100. At the same time, the deforming member 300 transmits the power of the middle shaft 100 to the connecting member 200, and then the power is transmitted to the toothed disc through the connecting member 200 to drive the wheel to rotate. The deforming member 300 will deform during the transmission of power. The torque sensor 800 can sense the deformation of the deforming member 300 to generate a torque signal, and then the torque signal is transmitted to the signal processor 500 for processing to obtain the torque of the power input to the middle shaft 100. The signal processor 500 sends the speed signal and the torque signal to the controller of the hub motor after preliminary processing, and the controller controls the hub motor to output appropriate power to drive the vehicle to travel with human power, so that the user can obtain a comfortable riding feeling. Compared with the existing torque and speed sensor, the torque and speed sensing device can make the speed sensor 600 sense the rotation speed and direction information of the middle shaft 100 synchronized with the torque information sensed by the torque sensor 800, so that the signal processor 500 can obtain the speed, rotation speed and torque information of the middle shaft 100 synchronously, thereby sending accurate state information of the middle shaft 100 to the controller, so that the controller can control the hub motor to output more appropriate power to drive the vehicle to travel with human power, thereby improving the riding comfort of the user.

[0081] The above description of the embodiments of the present application is made with reference to the accompanying drawings, but the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application.

Claims

1. A torque and speed sensing device, characterized in that, include: The central axis is rotatably mounted inside the bottom bracket. A connector, fitted around the outer periphery of the central shaft, is used to transmit power to the gear chain; The deformable component is fixedly connected to the central shaft at one end and to the connecting component at the other end. The mounting bracket is fixedly installed inside the five-way pipe and sleeved on the outer periphery of the deformable part; A velocity magnetic ring is sleeved and fixed to the outer wall of the deformable part; A speed sensor, mounted on the mounting bracket, is used to sense changes in the magnetic field of the speed magnetic ring; A torque sensor, mounted on the mounting bracket, is used to sense the deformation of the deformable component; The signal processor is communicatively connected to the speed sensor and the torque sensor. The mounting bracket has a convex ring at one end along the axial direction. The speed sensor and the torque sensor are located on opposite sides of the convex ring along the axial direction. The speed magnetic ring is located on the side of the speed sensor away from the torque sensor. The convex ring can separate the torque sensor from the speed sensor and the speed magnetic ring. The outer wall of the deformable part is provided with connecting teeth, and the inner wall of one end of the connector is provided with a mating connection part. The mating connection part is sleeved on the connecting teeth, thereby making the connector fixedly connected to the deformable part, and the two transmit power through the mating of the teeth. The convex ring has a groove on its end face away from the torque sensor, and the speed sensor is installed in the groove so that the speed sensor does not protrude from the outer end face of the convex ring; the torque and speed sensing device also includes a shielding component, which covers the outer periphery of the torque sensor to isolate external electromagnetic signal interference.

2. The torque and speed sensing device according to claim 1, characterized in that, The speed sensor and the speed magnetic ring are arranged opposite each other along the axial direction.

3. The torque and speed sensing device according to claim 1, characterized in that, The outer wall of the deformable part is provided with a boss, and the velocity magnetic ring abuts against the side wall of the boss.

4. The torque and speed sensing device according to claim 1, characterized in that, The speed sensor is provided with a circuit board that matches the shape of the inner wall of the groove, and the speed sensor is fixed to the inner wall of the groove through the circuit board.

5. The torque and speed sensing device according to claim 1, characterized in that, The outer wall of the mounting bracket is provided with a protrusion, and the shielding component is snapped between the protrusion and the convex ring.

6. The torque and speed sensing device according to claim 1, characterized in that, The velocity magnetic ring is an axially magnetized magnetic ring.

7. The torque and speed sensing device according to any one of claims 1 to 6, characterized in that, The torque sensor includes two induction coils, and the outer wall of the mounting bracket is provided with two annular grooves, in which the two induction coils are installed.

8. The torque and speed sensing device according to claim 7, characterized in that, The torque sensor also includes a first connecting line, and the induction coil is connected to the signal processor through the first connecting line. The outer wall of the mounting bracket is provided with a first clearance groove for avoiding the first connecting line.

9. The torque and speed sensing device according to claim 8, characterized in that, The speed sensor also includes a second connecting line, through which the speed sensor is connected to the signal processor, and the outer wall of the mounting bracket is provided with a second clearance groove for avoiding the second connecting line.

10. An electric bicycle, characterized in that, Includes the torque and speed sensing device as described in any one of claims 1 to 9.

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