CN115465399A - Torque and speed sensing device and electric bicycle - Google Patents

Torque and speed sensing device and electric bicycle Download PDF

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Publication number
CN115465399A
CN115465399A CN202211198968.0A CN202211198968A CN115465399A CN 115465399 A CN115465399 A CN 115465399A CN 202211198968 A CN202211198968 A CN 202211198968A CN 115465399 A CN115465399 A CN 115465399A
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CN
China
Prior art keywords
torque
speed
wall
mounting
sensing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211198968.0A
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Chinese (zh)
Inventor
周佳林
罗绍俊
熊贵林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Welling Motor Manufacturing Co Ltd
Original Assignee
Guangdong Welling Motor Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Welling Motor Manufacturing Co Ltd filed Critical Guangdong Welling Motor Manufacturing Co Ltd
Priority to CN202211198968.0A priority Critical patent/CN115465399A/en
Publication of CN115465399A publication Critical patent/CN115465399A/en
Priority to PCT/CN2023/084796 priority patent/WO2024066262A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/45—Control or actuating devices therefor
    • B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/20—Cycle computers as cycle accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/41—Sensor arrangements; Mounting thereof characterised by the type of sensor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/41—Sensor arrangements; Mounting thereof characterised by the type of sensor
    • B62J45/412—Speed sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/42—Sensor arrangements; Mounting thereof characterised by mounting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/42—Sensor arrangements; Mounting thereof characterised by mounting
    • B62J45/421—Sensor arrangements; Mounting thereof characterised by mounting at the pedal crank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/45—Control or actuating devices therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The invention discloses a torque and speed sensing device and an electric bicycle, wherein the torque and speed sensing device comprises a center shaft, a connecting piece, a deforming piece, a mounting frame, a signal processing circuit board, a speed sensor, a permanent magnet and a torque sensor, the center shaft is rotationally arranged in a five-way pipe, an induction tooth part is arranged on the outer wall of the center shaft, the connecting piece is sleeved on the periphery of the center shaft, the speed sensor is arranged on the signal processing circuit board and is arranged opposite to the induction tooth part, compared with the existing torque and speed sensor, the torque and speed sensing device is simpler to process a face tooth part and lower in processing difficulty by arranging the induction tooth part on the center shaft, and the tooth number density can be higher on the other hand, so that the induction precision of the speed sensor is improved.

Description

Torque and speed sensing device and electric bicycle
Technical Field
The invention relates to the technical field of electric bicycles, in particular to a torque and speed sensing device and an electric bicycle.
Background
In the related art, the hub motor driving system has certain market in the industry of the power-assisted electric bicycle due to the advantages of price advantage and simple and convenient modification. How to match the power drive of the hub motor with manpower to ensure that a user can obtain comfortable riding feeling is always a target pursued by a practitioner of the power-assisted electric bicycle, and the signal acquisition of the manpower is very important for the basis of drive control. One of the advantages of the hub motor of the electric bicycle is that the traditional bicycle is little modified and simple to modify, and meanwhile, the power of left and right pedals of the traditional bicycle is collected on the middle shaft at the earliest position, so that how to realize signal acquisition in the space for mounting the middle shaft of the traditional bicycle is realized, and the modification of the traditional bicycle is the smallest, which is one of the difficulties in designing the driving part of the power-assisted electric bicycle.
At present, the scheme of rotating speed and steering sensing of the existing products in the market adopts the scheme that a radial magnetizing speed magnetic ring is arranged on a middle shaft, a speed sensor is arranged at the position corresponding to the magnetic ring, the middle shaft drives the speed magnetic ring to synchronously rotate when being stressed to rotate, and the speed sensor senses the change of a magnetic field when the speed magnetic ring rotates to judge the rotating speed and the steering of the middle shaft. The problems with this solution are: 1. the more the pole pairs of the speed magnetic ring are, the higher the precision is. But the space diameter is small, the magnetizing width is limited, so that the number of pole pairs can only be 16; 2. the induction of the torque sensor depends on electricity or magnetism, a magnetic field exists in the speed magnetic ring, the speed magnetic ring is close to the deformation piece, signals of the torque sensor are easily interfered, and the precision of the torque sensor is reduced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a torque and speed sensing device with high sensing precision.
The invention also provides an electric bicycle with the torque and speed sensing device.
A torque and speed sensing device according to an embodiment of the first aspect of the invention comprises:
the middle shaft is rotatably arranged in the five-way pipe, an induction tooth part is arranged on the outer wall of the middle shaft, and the induction tooth part comprises a plurality of teeth which are uniformly distributed along the circumferential direction of the outer wall of the middle shaft;
the connecting piece is sleeved on the periphery of the middle shaft and used for transmitting power to the chain wheel;
one end of the deformation piece is fixedly connected with the middle shaft, and the other end of the deformation piece is fixedly connected with the connecting piece;
the mounting frame is fixedly arranged in the five-way pipe and sleeved on the periphery of the deformation piece;
the signal processing circuit board is arranged on the mounting rack;
the speed inductor is arranged on the signal processing circuit board and is opposite to the induction tooth part;
the permanent magnet is arranged on one side, away from the speed sensor, of the signal processing circuit board, and the speed sensor is used for sensing the change of a magnetic field of the permanent magnet so as to convey a speed signal to the signal processing circuit board;
and the torque sensor is arranged on the mounting frame and used for sensing the deformation of the deformation piece so as to convey a torque signal to the signal processing circuit board.
The torque and speed sensing device according to the embodiment of the first aspect of the invention has at least the following beneficial effects:
when a user enables the center shaft to rotate by trampling a power input center shaft, a plurality of teeth of an induction tooth part rotating along with the center shaft can cause the magnetic field of a permanent magnet to change, a speed inductor can induce the change of the magnetic field to generate a speed signal, the speed signal is transmitted to a signal processing circuit board to be processed to obtain the rotating speed and the rotating direction of the center shaft, meanwhile, when the center shaft rotates, the power of the center shaft is transmitted to a connecting piece through a deformation piece, the power is transmitted to a chain wheel through the connecting piece to drive the wheel to rotate, the deformation piece can deform in the power transmission process, a torque inductor can induce the deformation of the deformation piece to generate a torque signal, the torque signal is transmitted to the signal processing circuit board to be processed to obtain the torque size of the power of the input center shaft, the signal processing circuit board primarily processes the speed signal and the torque signal and then transmits the processed speed signal to a controller of the hub motor, and the controller controls the hub motor to output appropriate power to drive a human powered vehicle to run in a matched mode, and accordingly the user can obtain comfortable riding feeling. Moment and speed sensor relatively current, this moment and speed sensing device is through setting up response tooth portion at the axis, the processing of one side tooth is simpler, reduce the degree of difficulty of processing, on the other hand number of teeth density can set up more, thereby be favorable to improving the response precision of speed inductor, simultaneously because the permanent magnet is installed on the mounting bracket and is kept away from the deformation piece, can reduce the magnetization influence of permanent magnet to the deformation piece, reduce the interference to the moment inductor, thereby be favorable to improving the response precision of moment inductor.
According to some embodiments of the invention, the torque and speed sensing device further comprises a shield disposed about an outer periphery of the torque sensor.
According to some embodiments of the invention, the outer wall of the mounting bracket is provided with protrusions at two axial ends of the torque sensor, and the shielding member is clamped between the two protrusions.
According to some embodiments of the invention, the torque inductor comprises two induction coils, the outer wall of the mounting frame is provided with two annular grooves, and the two induction coils are mounted in the corresponding annular grooves.
According to some embodiments of the invention, the torque sensor further comprises a connecting wire, the induction coil is connected with the signal processing circuit board through the connecting wire, and an avoiding groove for avoiding the connecting wire is arranged on the outer wall of the mounting rack.
According to some embodiments of the invention, the mounting frame is provided with a groove, the speed sensor being embedded in the groove.
According to some embodiments of the invention, the five-way pipe further comprises a first mounting seat and a second mounting seat, the first mounting seat and the second mounting seat are mounted at two ends of the five-way pipe along the axial direction, the middle shaft is rotatably mounted on the first mounting seat through a first bearing, and the connecting piece is rotatably mounted on the second mounting seat through a second bearing.
According to some embodiments of the invention, the inner wall of the first mounting seat is provided with a clamping groove, 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 clamped in the clamping groove.
According to some embodiments of the invention, a boss is arranged on the outer wall of the deformation member, a limiting member is arranged on the outer wall of the middle shaft, and the mounting frame is clamped between the boss and the limiting member.
According to some embodiments of the invention, the outer wall of the middle shaft is provided with a mounting tooth portion, and the inner wall of the deformation piece is provided with a matching tooth portion matched with the mounting tooth portion.
According to some embodiments of the invention, the outer wall of the bottom bracket is further provided with a stop ring, and the stop ring is positioned between the mounting tooth part and the induction tooth part.
The electric bicycle according to the second aspect of the present invention includes the torque and speed sensing device of the first aspect of the present invention.
According to the electric bicycle of the embodiment of the second aspect of the invention, at least the following beneficial effects are achieved:
the electric bicycle adopts the moment and speed sensing device, when a user inputs power into the center shaft through treading to enable the center shaft to rotate, a plurality of teeth of the induction tooth part rotating along with the center shaft can cause the magnetic field of the permanent magnet to change, the speed sensor can induce the change of the magnetic field to generate speed signals, then the speed signals are transmitted to the signal processing circuit board to be processed to obtain the rotating speed and the rotating direction of the center shaft, meanwhile, when the center shaft rotates, the power of the center shaft is transmitted to the connecting piece through the deformation piece, then the power is transmitted to the chain wheel through the connecting piece to drive the wheel to rotate, the deformation piece can deform in the power transmission process, the moment sensor can induce the deformation of the deformation piece to generate moment signals, then the moment signals are transmitted to the signal processing circuit board to be processed to obtain the moment size of the power input into the center shaft, the signal processing circuit board primarily processes the speed signals and the moment signals and then transmits the speed signals to the controller of the hub motor, and then the controller controls the hub motor to output proper power to match with the manpower to drive the vehicle to run, and accordingly, the user can obtain comfortable riding feeling. Moment and speed sensor relatively current, this moment and speed sensing device is through setting up response tooth portion at the axis, the processing of one side tooth is simpler, reduce the degree of difficulty of processing, on the other hand number of teeth density can set up more, thereby be favorable to improving the response precision of speed inductor, simultaneously because the permanent magnet is installed on the mounting bracket and is kept away from the deformation piece, can reduce the magnetization influence of permanent magnet to the deformation piece, reduce the interference to the moment inductor, thereby be favorable to improving the response precision of moment inductor, and then be favorable to improving the effect of in-wheel motor helping hand, thereby improve the comfort level that the user ridden.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a cross-sectional structural schematic diagram of a torque and speed sensing device in accordance with certain embodiments of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is an exploded view of a torque and speed sensing device according to some embodiments of the present invention;
FIG. 4 is a perspective view of a bottom bracket according to some embodiments of the present invention;
FIG. 5 is an exploded view of a mounting bracket, signal processing circuitry, speed sensor and torque sensor according to some embodiments of the invention;
FIG. 6 is a schematic perspective view of a connector according to some embodiments of the present invention;
FIG. 7 is a schematic perspective view of a deformable member according to some embodiments of the invention;
fig. 8 is a perspective view of a first mount of some embodiments of the present invention.
Reference numerals are as follows:
a central axis 100; an inductive tooth 110; mounting teeth 120; a retainer ring 130;
a connecting member 200; the mating connection portion 210;
a deforming member 300; a mating tooth portion 310; a boss 320; the connecting tooth portion 330;
a mounting frame 400; a recess 410; a rib 420; an inverted structure 430; a raised ring structure 440; an annular groove 450; an avoidance slot 460;
a signal processing circuit board 500; a signal line 510;
a speed sensor 600;
a permanent magnet 700;
a torque sensor 800; an induction coil 810; a connection line 820; a shield 830;
a five-way tube 900; a first mount 910; a card slot 911; a second mount 920; a first bearing 930; a second bearing 940.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings only for the convenience of description of the present invention and simplification of the description, and does 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless otherwise expressly limited, the terms set, mounted, connected, assembled, fitted, etc. are to be construed broadly, and those skilled in the art can reasonably determine the specific meanings of the terms in the present invention in consideration of the detailed contents of the technical solutions.
In the related art, the hub motor driving system has the advantages of price advantage and simple and convenient modification, and therefore has a certain market in the industry of the power-assisted electric bicycle. How to match the power drive of the hub motor with manpower to ensure that a user can obtain comfortable riding feeling is always a target pursued by a practitioner of the power-assisted electric bicycle, and the collection of the manpower signal is very important for the basis of drive control. One of the advantages of the hub motor of the electric bicycle is that the modification of the traditional bicycle is small, the modification is simple, and meanwhile, the place where the power of left and right pedals of the traditional bicycle is gathered at the earliest is on the middle shaft, so that how to realize signal acquisition in the installation space of the middle shaft of the traditional bicycle is realized, and the modification of the traditional bicycle is minimum, which is one of the difficulties in designing the driving part of the power-assisted electric bicycle.
At present, the scheme of rotating speed and steering sensing of the existing products in the market adopts the scheme that a radial magnetizing speed magnetic ring is arranged on a middle shaft, a speed sensor is arranged at the position corresponding to the magnetic ring, the middle shaft drives the speed magnetic ring to synchronously rotate when being stressed to rotate, and the speed sensor senses the change of a magnetic field when the speed magnetic ring rotates to judge the rotating speed and the steering of the middle shaft. The problems with this solution are: 1. the more the pole pairs of the speed magnetic ring are, the higher the precision is. But the space diameter is small, the magnetizing width is limited, so that the number of pole pairs can only be 16; 2. the induction of the torque sensor depends on electricity or magnetism, a magnetic field exists in the speed magnetic ring, the speed magnetic ring is close to the deformation piece, signals of the torque sensor are easily interfered, and the precision of the torque sensor is reduced.
In order to solve at least one of the above technical problems, the present invention provides a torque and speed sensing device, which can obtain higher sensing precision and is simpler to process.
Referring to fig. 1 to 3, a torque and speed sensing device according to an embodiment of the first aspect of the present invention includes a central shaft 100, a connecting member 200, a deforming 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 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 two ends of the middle shaft 100 are connected with pedals, so that when a user pedals the pedals, the pedaling power is input into the middle shaft 100. The outer wall of axis 100 is provided with response tooth portion 110, and response tooth portion 110 includes a plurality of teeth, and a plurality of teeth are along the outer wall circumference equipartition of axis 100, have the clearance between the adjacent tooth.
The connecting member 200 is sleeved on the periphery of the middle shaft 100 and is in coaxial clearance fit with the middle shaft 100. The connecting piece 200 is connected with the chain wheel and used for transmitting power to the chain wheel, and the chain wheel drives the wheel to rotate through the transmission mechanism.
One end of the deformation member 300 is fixedly connected to the middle shaft 100, and the other end is fixedly connected to the connecting member 200, so as to transmit the power of the middle shaft 100 to the connecting member 200. For example, the deformable member 300 is substantially a cylindrical structure, one end of the deformable member 300 may be fixed to the outer wall of the central shaft 100 in a sleeved manner, the other end of the deformable member may be in coaxial clearance fit with the central shaft 100, and the connecting member 200 may be fixed to the outer wall of the other end of the deformable member 300 in a sleeved manner. The deformation member 300 may be subjected to a large torque in the process of transmitting power, and may also deform to some extent, so that the deformation member 300 may be made of a metal material with high strength and certain elasticity, for example, an aluminum alloy or a steel material.
The mounting frame 400 is fixedly disposed in the five-way tube 900, and the periphery of the deformation member 300 is sleeved with the mounting frame 400. The signal processing circuit board 500 is installed on one side of the mounting frame 400 departing from the center shaft 100, the signal processing circuit board 500 is provided with a signal line 510, and the signal line 510 is connected with a controller of the in-wheel motor. The speed sensor 600 is mounted on the signal processing circuit board 500, and the speed sensor 600 is disposed opposite to the sensing tooth 110 of the bottom bracket axle 100. The permanent magnet 700 is installed on a side of the signal processing circuit board 500 away from the speed sensor 600, and the speed sensor 600 is used for sensing the magnetic field variation of the permanent magnet 700 to transmit a speed signal to the signal processing circuit board 500. Specifically, when middle axle 100 rotates, induction tooth portion 110 rotates along with middle axle 100, because the magnetic induction line can preferentially pass through the material that magnetic permeability is high, consequently a plurality of teeth of induction tooth portion 110 can drive the magnetic induction line and remove when rotating to make permanent magnet 700's magnetic field change, speed inductor 600 can sense this change and output corresponding speed signal.
The moment sensor 800 is installed on the mounting frame 400, and the moment sensor 800 can sense the deformation of the deformation member 300 so as to transmit a moment signal to the signal processing circuit board 500. Specifically, the moment sensor 800 is located outside the middle position of the deformation member 300, so that the degree of distortion of the deformation member 300 can be sensed more sensitively.
When a user steps on the pedal, the power is input into the middle shaft 100 by the pedal to enable the middle shaft 100 to rotate, a plurality of teeth of the induction tooth part 110 rotating along with the middle 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, then the speed signal is transmitted to the signal processing circuit board 500 to be processed to obtain the rotating speed and the rotating direction of the middle shaft 100, meanwhile, when the middle shaft 100 rotates, the power of the middle shaft 100 is transmitted to the connecting piece 200 through the deforming piece 300 and then transmitted to the chain wheel through the connecting piece 200 to drive the wheel to rotate, the deforming piece 300 deforms in the power transmission process, the torque sensor 800 can sense the deformation of the deforming piece 300 to generate a torque signal, then the torque signal is transmitted to the signal processing circuit board 500 to be processed to obtain the torque of the power input into the middle shaft 100, the signal processing circuit board 500 primarily processes the speed signal and the torque signal and then transmits the speed signal to the controller of the in-wheel hub motor, and the controller controls the in turn to output appropriate power to match with manpower to drive the vehicle to run, and accordingly the user can obtain comfortable riding feeling. Moment and speedtransmitter relatively current, this application is through setting up response tooth portion 110 at axis 100, the processing of one side tooth is simpler, reduce the degree of difficulty of processing, on the other hand number of teeth density can set up more, thereby be favorable to improving speed sensor 600's response precision, simultaneously because permanent magnet 700 installs on mounting bracket 400, consequently can be relative current technique more keep away from the deformation piece 300, reduce the magnetization influence of permanent magnet 700 to deformation piece 300, reduce the interference to moment sensor 800, thereby be favorable to improving moment sensor 800's response precision.
It can be understood that, in order to reduce interference of external signals on the torque sensor 800, referring to fig. 1 and 5, in some embodiments of the present invention, the speed and torque sensing apparatus further includes a shielding member 830, and the shielding member 830 is disposed at an outer periphery of the torque sensor 800, so that interference of external electromagnetic signals can be isolated, and the sensing accuracy of the torque sensor 800 can be improved. Specifically, the shielding member 830 is made of a metal material, for example, the shielding member 830 may be a metal shell or a metal mesh, and can perform a good shielding function.
It can be understood that, in order to limit the shielding element 830 on the mounting bracket 400, referring to fig. 5, in some embodiments of the present invention, two protrusions are disposed on an outer wall of the mounting bracket 400, the two protrusions are located at outer sides of two axial ends of the torque sensor 800, and when the shielding element 830 is covered on the outer periphery of the torque sensor 800, the two protrusions can play a role in limiting the axial movement of the shielding element 830, so that the axial movement of the shielding element 830 can be prevented, which is beneficial to improving the shielding effect of the shielding element 830 on the torque sensor 800. Of course, the two protrusions may have the same structure or different structures, for example, one of the protrusions is a convex ring structure 440, the other protrusion is an inverted structure 430, and a side of the inverted structure 430 away from the convex ring structure 440 has a slope for guiding the shielding element 830. When the shielding element 830 is installed, the shielding element 830 can be moved from the inverse buckle structure 430 to the convex ring structure 440 and sleeved on the outer periphery of the torque sensor 800, and when the shielding element 830 moves between the inverse buckle structure 430 and the convex ring structure 440, the shielding element 830 is limited by the inverse buckle structure 430 and the convex ring structure 440 and cannot move axially.
It should be noted that, in some embodiments of the present invention, referring to fig. 5, the torque sensor 800 includes two induction coils 810, the outer wall of the mounting frame 400 is provided with two annular grooves 450, and 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 firmer, and the induction accuracy of deformation of the deformation element 300 is prevented from being affected by the easy shake of the induction coils 810.
It can be understood that, in some embodiments of the present invention, referring to fig. 5, the torque sensor 800 further includes a connection line 820, the sensing coil 810 is connected to the signal processing circuit board 500 through the connection line 820, the evasion groove 460 is disposed on the outer wall of the mounting rack 400, and the connection line 820 is accommodated in the evasion groove 460, so that the connection line 820 is prevented from protruding out of the outer wall of the mounting rack 400, which is beneficial to improving the mounting stability of the connection line 820, and meanwhile, reducing the influence of the outside on the connection line 820, which is beneficial to further improving the sensing accuracy of the torque sensor 800.
It is understood that, in some embodiments of the present invention, referring to fig. 2, the mounting bracket 400 is provided with the groove 410, and 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 sensing tooth 110, so that the magnetic field of the permanent magnet 700 is more easily changed when the sensing tooth 110 rotates, thereby facilitating to improve the sensing accuracy of the speed sensor 600.
It is understood that, in order to facilitate the installation of middle shaft 100 and connecting member 200, in some embodiments of the present invention, referring to fig. 1, the torque and speed sensing device further includes a first installation base 910, a second installation base 920, a first bearing 930 and a second bearing 940, wherein first installation base 910 and second installation base 920 are installed at both ends of five-way pipe 900 in the axial direction, middle shaft 100 is rotatably installed at first installation base 910 through first bearing 930, and connecting member 200 is rotatably installed at second installation base 920 through second bearing 940. Specifically, the first mounting seat 910 may be fixedly mounted at one axial end of the five-way pipe 900 in a threaded connection or interference fit manner, and the second mounting seat 920 may be fixedly mounted at the other axial end of the five-way pipe 900 in a threaded connection or interference fit manner. The first mounting base 910 is a hollow structure, the outer ring of the first bearing 930 is fixedly connected to the inner wall of the first mounting base 910, and the inner ring of the first bearing 930 is sleeved and fixed to the outer wall of the middle shaft 100, so that the middle shaft 100 can be mounted in the five-way pipe 900 through the first bearing 930 and can smoothly rotate. 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 piece 200, so that the connecting piece 200 can smoothly rotate through the second bearing 940.
Of course, a first raceway may be provided on the outer wall of the bottom bracket 100 and the inner wall of the first mounting seat 910, and balls may be installed in the first raceway, so that the bottom bracket 100 may be rotatably installed in the first mounting seat 910. Similarly, the outer wall of the connecting member 200 and the inner wall of the second mounting seat 920 may also be provided with a second raceway, in which balls are installed, so that the connecting member 200 can be rotatably installed in the second mounting seat 920.
It can be understood that, in order to fixedly arrange the mounting bracket 400 in the five-way pipe 900 along the circumferential direction, referring to fig. 5 and 8, in some embodiments of the present invention, a clamping groove 911 is arranged on an inner wall of the first mounting seat 910, a rib 420 is arranged on an outer wall of the mounting bracket 400, the clamping groove 911 and the rib 420 are both arranged along the axial direction of the five-way pipe 900, and the mounting bracket 400 is arranged on the first mounting seat 910 by clamping the rib 420 in the clamping groove 911, so that the mounting bracket 400 can be circumferentially fixed, and the mounting bracket 400 can be prevented from rotating relative to the five-way pipe 900 to affect the normal operation of the relevant components arranged thereon. Of course, draw-in groove 911 can be provided with a plurality ofly, and a plurality of draw-in grooves 911 set up along circumference interval distribution, and protruding muscle 420 also can be provided with a plurality ofly, and a plurality of protruding muscle 420 set up along circumference interval distribution to go into respectively through a plurality of protruding muscle 420 in the card goes into corresponding draw-in groove 911, make mounting bracket 400 can fix in five-way pipe 900 circumference more firmly. Of course, it is also possible to fixedly connect the mounting bracket 400 to the inner wall of the five-way pipe 900, or fixedly connect the mounting bracket 400 to the second mounting seat 920.
It can be understood that, in order to axially limit the mounting block 400 and prevent the mounting block 400 from axially moving, in some embodiments of the present invention, referring to fig. 1 and 7, a boss 320 is disposed on an outer wall of an end of the deforming member 300 away from the speed sensor 600, a limiting member is mounted on an outer wall of an end of the central shaft 100 away from the torque sensor 800, and the mounting block 400 is clamped between the boss 320 and the limiting member, so that the boss 320 and the limiting member can act as a stop for the mounting block 400 and prevent the mounting block 400 from axially moving. Specifically, the limiting member may be a snap spring or a shaft sleeve, which can well block the mounting frame 400 from moving along the axial direction.
It can be understood that, in order to transmit the power of the middle axle 100 to the deformation element 300 more reliably, in some embodiments of the present invention, referring to fig. 4 and 7, the outer wall of the middle axle 100 is provided with the mounting tooth portion 120, the mounting tooth portion 120 includes a plurality of circumferentially uniformly distributed teeth, the inner wall of the deformation element 300 is provided with the mating tooth portion 310 that is mated with the mounting tooth portion 120, the mating tooth portion 310 includes a plurality of circumferentially uniformly distributed mating teeth, during mounting, the mating tooth portion 310 is sleeved on the outer periphery of the mounting tooth portion 120, so that the deformation element 300 is fixed to the outer wall of the middle axle 100 in a clamping manner, and meanwhile, through the mating of the teeth and the teeth, the power transmission between the middle axle 100 and the deformation element 300 is more reliable, and the condition that the deformation element 300 slips relative to the middle axle 100 when the power is too large is reduced. Similarly, the deforming member 300 and the connecting member 200 can adopt a similar structure to realize reliable power transmission. For example, referring to fig. 6 and 7, an outer wall of one end of the deformable member 300, which is far away from the mating tooth portion 310, is provided with a connecting tooth portion 330, an inner wall of one end of the connecting member 200 is provided with a mating connecting portion 210, and 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, and meanwhile, power is transmitted between the two through the mating of teeth, so that the power transmission is more reliable.
It should be noted that, in order to prevent the deformation element 300 from moving in the axial direction, in some embodiments of the present invention, referring to fig. 1 and fig. 4, a stop ring 130 is further disposed on the outer wall of the middle shaft 100, the stop ring 130 is located between the installation tooth portion 120 and the sensing tooth portion 110, and the stop ring 130 can play a role of stopping the deformation element 300 from moving in the axial direction, of course, a limiting structure such as a snap spring may also be fixedly installed on the outer wall of the middle shaft 100, and the snap spring is located on a side of the deformation element 300 away from the stop ring 130, so that the axial movement of the deformation element 300 is limited by the cooperation of the snap spring and the stop ring 130.
The electric bicycle comprises a frame, a wheel, a hub motor and the torque and speed sensing device. The frame is provided with five-way pipe 900, and moment and speed sensing device installs in five-way pipe 900, and the wheel is rotatable to be installed in the frame, and the casing and the wheel fixed connection of in-wheel motor. The torque and speed sensing device sends the acquired rotating speed, steering and torque information of the center shaft 100 to the controller, and the controller controls the hub motor to output proper power according to the information so as to match the power treaded by the user to drive the wheels to rotate and realize a good power assisting effect, so that the user can obtain a comfortable riding feeling.
By adopting the torque and speed sensing device of the embodiment of the first aspect of the invention, when a user steps on a pedal, the pedal inputs power into the middle shaft 100 to enable the middle shaft 100 to rotate, a plurality of teeth of the sensing tooth part 110 rotating along with the middle 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, then the speed signal is transmitted to the signal processing circuit board 500 to be processed to obtain the rotating speed and the rotating direction of the middle shaft 100, meanwhile, when the middle shaft 100 rotates, the power of the middle shaft 100 is transmitted to the connecting piece 200 through the deforming piece 300 and then transmitted to a chain wheel through the connecting piece 200 to drive the wheel to rotate, the deforming piece 300 can deform in the process of transmitting power, the torque sensor 800 can sense the deformation piece 300 to generate a torque signal, then the torque signal is transmitted to the signal processing circuit board 500 to be processed to obtain the torque magnitude of the power input into the middle shaft 100, the signal processing circuit board 500 primarily processes the speed signal and the torque signal and transmits the torque signal to a controller of the hub motor, and then controls the hub motor to output appropriate power to cooperate with the driving of the driving vehicle, so that the user can comfortably ride the human power. Moment and speed sensor current relatively, this application is through setting up response tooth portion 110 at axis 100, the processing of one side tooth is simpler, reduce the degree of difficulty of processing, on the other hand tooth number density can set up more highly, thereby be favorable to improving speed sensor 600's response precision, simultaneously because permanent magnet 700 installs on mounting bracket 400 and keeps away from a deformation 300, can reduce the magnetization influence of permanent magnet 700 to a deformation 300, reduce the interference to moment sensor 800, thereby be favorable to improving moment sensor 800's response precision.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (12)

1. Moment and speed sensing device, its characterized in that includes:
the middle shaft is rotatably arranged in the five-way pipe and is provided with an induction tooth part, and the induction tooth part comprises a plurality of teeth which are uniformly distributed along the circumferential direction of the outer wall of the middle shaft;
the connecting piece is sleeved on the periphery of the middle shaft and used for transmitting power to the chain wheel;
one end of the deformation piece is fixedly connected with the middle shaft, and the other end of the deformation piece is fixedly connected with the connecting piece;
the mounting frame is fixedly arranged in the five-way pipe and sleeved on the periphery of the deformation piece;
the signal processing circuit board is arranged on the mounting rack;
the speed inductor is arranged on the signal processing circuit board and is opposite to the induction tooth part;
the permanent magnet is arranged on one side, away from the speed sensor, of the signal processing circuit board, and the speed sensor is used for sensing the change of a magnetic field of the permanent magnet and transmitting a speed signal to the signal processing circuit board;
and the torque sensor is arranged on the mounting frame and used for sensing the deformation of the deformation piece so as to transmit a torque signal to the signal processing circuit board.
2. The torque and speed sensing device according to claim 1, further comprising a shield covering an outer periphery of the torque sensor.
3. The torque and speed sensor according to claim 2, wherein the outer wall of the mounting bracket is provided with protrusions at both axial ends of the torque sensor, and the shield is clamped between the two protrusions.
4. The torque and speed sensing device according to claim 1, wherein the torque sensor comprises two induction coils, the outer wall of the mounting bracket is provided with two annular grooves, and the two induction coils are mounted in the corresponding annular grooves.
5. The torque and speed sensing device according to claim 4, wherein the torque sensor further comprises a connecting wire, the induction coil is connected with the signal processing circuit board through the connecting wire, and an avoiding groove for avoiding the connecting wire is provided on an outer wall of the mounting frame.
6. The torque and speed sensing device according to claim 1 wherein said mounting bracket is provided with a recess, said speed sensor being embedded in said recess.
7. The torque and speed sensing device according to claim 1, further comprising a first mounting seat and a second mounting seat, wherein the first mounting seat and the second mounting seat are mounted at two axial ends of the five-way pipe, 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.
8. The torque and speed sensing device according to claim 7, wherein a clamping groove is formed in an inner wall of the first mounting seat, a rib is formed in an outer wall of the mounting frame, and the mounting frame is circumferentially fixed to the first mounting seat through the rib clamped in the clamping groove.
9. The torque and speed sensor according to claim 8, wherein the outer wall of the deformation member is provided with a boss, the outer wall of the middle shaft is provided with a limiting member, and the mounting bracket is clamped between the boss and the limiting member.
10. The torque and speed sensor according to claim 1, wherein the outer wall of the middle shaft is provided with a mounting tooth portion, and the inner wall of the deformation member is provided with a mating tooth portion which mates with the mounting tooth portion.
11. The torque and speed sensing device according to claim 10, wherein a stop ring is further disposed on an outer wall of the bottom bracket shaft, and the stop ring is located between the mounting teeth and the sensing teeth.
12. Electric bicycle, characterized in that it comprises a torque and speed sensing device according to any of claims 1 to 11.
CN202211198968.0A 2022-09-29 2022-09-29 Torque and speed sensing device and electric bicycle Pending CN115465399A (en)

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CN202211198968.0A CN115465399A (en) 2022-09-29 2022-09-29 Torque and speed sensing device and electric bicycle
PCT/CN2023/084796 WO2024066262A1 (en) 2022-09-29 2023-03-29 Torque and speed sensing device and electric bicycle

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Application Number Priority Date Filing Date Title
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CN103171733B (en) * 2013-04-09 2015-09-30 苏州八方电机科技有限公司 A kind of electrical bicycle middle shaft moment sensor
CN105015692A (en) * 2014-04-22 2015-11-04 苏州八方电机科技有限公司 Torque-speed sensing device for center shaft of electric bicycle
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CN115465399A (en) * 2022-09-29 2022-12-13 广东威灵电机制造有限公司 Torque and speed sensing device and electric bicycle

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WO2024066262A1 (en) * 2022-09-29 2024-04-04 广东威灵电机制造有限公司 Torque and speed sensing device and electric bicycle

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