阅读说明：本技术 中轴式无线能量信号传输力矩传感器系统 (Central-axis wireless energy signal transmission torque sensor system ) 是由 黄娅琼 唐勇 牛建伟 胡曾攀 汪海涛 于 2019-12-09 设计创作，主要内容包括：本申请公开了一种中轴式无线能量信号传输力矩传感器系统,包括：中轴；弹性套筒；磁钢和与磁钢对应的霍尔传感器,二者均固定于弹性套筒上；筒形支架,套设于中轴外,当该传感器系统装配至电动自行车后,筒形支架与五通管相对固定；小线圈和与小线圈连接的第一电路板,二者均固定于中轴上,且第一电路板与霍尔传感器电路连接；大线圈和与大线圈连接的第二电路板,二者均固定于筒形支架上,且大线圈与小线圈构成耦合线圈组。该系统采用非接触式信号传输技术,可以非常方便地实现旋转部件与静止部件的电气连接,也可以实现信号的传输和电能的传输,达到准确、实时地测量转矩信号,电路简单,测量精度高,产品一致性好。(The application discloses axis formula wireless energy signal transmission torque sensor system includes: a middle shaft; an elastic sleeve; the magnetic steel and the Hall sensor corresponding to the magnetic steel are both fixed on the elastic sleeve; the cylindrical bracket is sleeved outside the middle shaft, and is relatively fixed with the five-way pipe after the sensor system is assembled to the electric bicycle; the small coil and the first circuit board are connected with the small coil, the small coil and the first circuit board are fixed on the middle shaft, and the first circuit board is connected with the Hall sensor circuit; the large coil and the second circuit board connected with the large coil are both fixed on the cylindrical support, and the large coil and the small coil form a coupling coil group. The system adopts a non-contact signal transmission technology, can conveniently realize the electrical connection between a rotating part and a static part, can also realize the transmission of signals and the transmission of electric energy, achieves the accurate and real-time measurement of torque signals, and has the advantages of simple circuit, high measurement precision and good product consistency.)

1. A central-axis wireless energy signal transmission torque sensor system, comprising:

the middle shaft (1), the two axial ends of the middle shaft (1) are provided with crank connecting parts (101); and

the elastic sleeve (2) is sleeved outside the middle shaft (1), one axial end of the elastic sleeve (2) is fixed with the middle shaft (1), and the other axial end of the elastic sleeve (2) is provided with a chain wheel connecting part (201);

it is characterized by also comprising:

the magnetic steel (7) and the Hall sensor (8) corresponding to the magnetic steel are fixed on the elastic sleeve (2), and the magnetic steel (7) and the Hall sensor (8) are arranged at intervals in the axis direction of the elastic sleeve (2);

the cylindrical support (9) is sleeved outside the middle shaft (1), and when the middle shaft type wireless energy signal transmission torque sensor system is assembled to an electric bicycle, the cylindrical support (9) and a five-way pipe of the electric bicycle are relatively fixed;

the small coil (10) and the first circuit board (11) are in circuit connection with the small coil, the first circuit board (11) and the small coil (10) are both fixed on the middle shaft (1), and the first circuit board (11) is in circuit connection with the Hall sensor (8); and

the coil winding device comprises a large coil (13) and a second circuit board (12) connected with the large coil in a circuit mode, the second circuit board (12) and the large coil (13) are fixed on the cylindrical support (7), and the large coil (13) and the small coil (10) form a coupling coil group.

2. The bottom bracket system of claim 1, further comprising:

the left connecting wrist (3) is rotatably sleeved outside the middle shaft (1), and a first supporting bearing (5) is arranged between the left connecting wrist (3) and the middle shaft (1); and

the right connecting wrist (4) is rotatably sleeved outside the elastic sleeve (2), and a second supporting bearing (6) is arranged between the right connecting wrist (4) and the elastic sleeve (2);

one end of the cylindrical support (9) is inserted into the left connecting wrist (3), and the outer peripheral surface of the cylindrical support (9) is arranged in contact with the inner peripheral surface of the left connecting wrist (3).

3. Central shaft wireless energy signal transmission torque sensor system according to claim 2, characterized in that a third support bearing (14) is provided between the cylindrical support (9) and the central shaft (1).

4. Central axis wireless energy signal transmission torque sensor system according to claim 3, characterized in that said third support bearing (14) is housed inside said left connecting wrist (3) and said cylindrical support (9) is radially interposed between said left connecting wrist (3) and said third support bearing (14).

5. Central axis wireless energy signal transmission torque sensor system according to claim 1, characterized in that the large coil (13) is arranged concentrically to the small coil (10).

6. Central-axis wireless energy signal transmission torque sensor system according to claim 1, characterized in that signal outlet wires for connecting a motor controller are connected to the second circuit board (12).

7. The central-axis wireless energy signal transmission torque sensor system according to claim 6, wherein the cylindrical support (9) is provided with a threading hole for the signal outgoing line to pass through.

Technical Field

The application relates to a central shaft type wireless energy signal transmission torque sensor system.

Background

Electric vehicles, particularly light riding type electric vehicles, are increasingly accepted by society due to their advantages of lightness, labor saving, no pollution and the like, and are widely popularized. The light riding type electric vehicle converts force applied to pedals by a rider into an electric signal which can be identified by the electric vehicle controller through the torque sensor in the riding process, so that the output power of the motor is controlled according to the torque applied by the rider, and the purpose of riding and controlling the electric vehicle is achieved. An electric bicycle with power assistance is popular in europe and japan, and people need to step on pedals to assist in riding, and power is not output when the people do not ride the electric bicycle with power assistance. When a person rides the electric bicycle, the middle shaft torque sensor acquires a torque value when the middle shaft is twisted, a physical twisting angle is converted into a corresponding torque voltage signal and transmitted to the control system (mainly a motor controller), and the control system outputs a control signal to control the output power and the speed of the motor, so that the purpose of controlling the output power of the electric bicycle when the person rides the electric bicycle can be realized, and the requirements of energy conservation and environmental protection are met.

However, the traditional middle shaft torque sensing system adopts a contact signal transmission structure, and has the defects of complex mechanical structure, poor stability and the like.

Disclosure of Invention

The purpose of the application is: aiming at the problems, the system adopts a non-contact signal transmission technology, can conveniently realize the electrical connection between a rotating part and a static part, can also realize the transmission of signals and the transmission of electric energy, can accurately measure torque signals in real time, and has the advantages of simple circuit, high measurement precision and good product consistency.

The technical scheme of the application is as follows:

a central-axis wireless energy signal transmission torque sensor system, comprising:

the crank connecting parts are arranged at the two axial ends of the middle shaft; and

the elastic sleeve is sleeved outside the middle shaft, one axial end of the elastic sleeve is fixed with the middle shaft, and the other axial end of the elastic sleeve is provided with a chain wheel connecting part;

further comprising:

the magnetic steel and the Hall sensors correspond to the magnetic steel, the magnetic steel and the Hall sensors are fixed on the elastic sleeve, and the magnetic steel and the Hall sensors are arranged at intervals in the axial direction of the elastic sleeve;

the cylindrical bracket is sleeved outside the middle shaft, and is relatively fixed with a five-way pipe of the electric bicycle after the middle shaft type wireless energy signal transmission torque sensor system is assembled to the electric bicycle;

the first circuit board and the small coil are fixed on the middle shaft, and the first circuit board is connected with the Hall sensor circuit; and

the second circuit board and the large coil are fixed on the cylindrical support, and the large coil and the small coil form a coupling coil group.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

this well axle type wireless energy signal transmission torque sensor system still includes:

the left connecting wrist is rotatably sleeved outside the middle shaft, and a first supporting bearing is arranged between the left connecting wrist and the middle shaft; and

the right connecting wrist is rotatably sleeved outside the elastic sleeve, and a second supporting bearing is arranged between the right connecting wrist and the elastic sleeve;

one end of the cylindrical support is inserted into the left connecting wrist, and the outer peripheral surface of the cylindrical support is arranged in contact with the inner peripheral surface of the left connecting wrist.

And a third support bearing is arranged between the cylindrical support and the middle shaft.

The third support bearing is housed inside the left connecting wrist, and the cylindrical bracket is radially interposed between the left connecting wrist and the third support bearing.

The large coil is concentrically arranged with the small coil.

And the second circuit board is connected with a signal outgoing line used for connecting a motor controller.

And the cylindrical support is provided with a threading hole for the signal outgoing line to penetrate out.

The application has the advantages that:

1. the application has the advantages that the transmission signal mode is a modulated frequency signal, the anti-interference capability is strong, the high-frequency electromagnetic interference signal resistance is strong, the influence of dust and oil stains is avoided, the influence of axial deflection of a machine is avoided, and the stability of the signal is high.

2. The transmission of the electric energy and the signal is in a non-contact mode, the power consumption of the rotating electronic part is low, the power consumption is stable under any working condition state, the power consumption of wireless electric energy signal transmission is remarkably reduced, and the wireless electric energy signal transmission device is suitable for application of low-power wireless signal transmission.

3. The high-precision Hall sensor is adopted to measure the displacement change of the magnetic steel, the magnetic field intensity distribution around the magnetic steel at different spatial positions is different, and the magnetic field intensity distribution in certain areas forms good linear gradient distribution. Linear hall sensor just can the sensing change of magnetic field intensity to convert to corresponding voltage signal output, the change of hall voltage corresponds the change of magnetic field intensity, and the change of magnetic field intensity is corresponding to the change of magnet steel and hall relative position. The change of the torsion angle of the elastic sleeve determines the change of the relative position of the Hall and the magnetic steel, so that the size of the torsion angle of the elastic sleeve can be measured. Because the torsion angle of the torsion of the elastic sleeve in the elastic deformation range and the torsion form a good linear relation, the voltage and the torsion of the Hall also form a good linear relation. Because the signal precision is high, the linearity is good, the signal is stable, the product has good consistency in batch production, and the assembly and debugging process is simple.

4. The same pair of coils is used for wireless signal transmission and energy transmission sampling, and modulated low-frequency moment frequency signals are superposed on signals transmitted by high-frequency energy transmission. The realization mode is simple, reliable and stable, and an additional moment signal transmission system is not needed. The wireless energy transmission system adopts an LC series resonance circuit to realize wireless transmission of electric energy.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic perspective view of a torque sensor system according to an embodiment of the present disclosure;

FIG. 2 is a front view of a torque sensor system in an embodiment of the present application;

FIG. 3 is a cross-sectional view of a torque sensor system in an embodiment of the present application;

FIG. 4 is an exploded view of a torque sensor system in an embodiment of the present application;

wherein: 1-middle shaft, 101-crank connecting part, 2-elastic sleeve, 201-chain wheel connecting part, 3-left connecting wrist, 4-right connecting wrist, 5-first supporting bearing, 6-second supporting bearing, 7-magnetic steel, 8-Hall sensor, 9-cylindrical support, 10-small coil, 11-first circuit board, 12-second circuit board, 13-large coil and 14-third supporting bearing.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In the description of the present specification, the terms "connected", "mounted", "fixed", and the like are to be understood in a broad sense. For example, "connected" may be fixedly connected, detachably connected, or integrally connected; may be connected directly or indirectly through intervening media. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present application.

Fig. 1 to 4 show a preferred embodiment of the middle shaft type wireless energy signal transmission torque sensor system of the present application, which is used on an electric bicycle, and like the torque sensor system used on the conventional electric bicycle, the torque sensor system also includes a middle shaft 1, both axial ends of the middle shaft 1 are provided with crank connecting portions 101 for connecting a crank, the middle shaft 1 is externally sleeved with an elastic sleeve 2, and when the elastic sleeve 2 is subjected to an axial torsional moment, a circumferential torsional deformation occurs. In fig. 3, the axial left end of the elastic sleeve 2 is fixedly connected with the middle shaft 1, and the axial right end is provided with a chain wheel connecting part 201 for connecting a chain wheel. The middle shaft 1 is further rotatably sleeved with a left connecting wrist 3 and a right connecting wrist 4, and the left connecting wrist 3 and the right connecting wrist 4 are used for tightly installing the torque sensor system on a frame of the electric bicycle, specifically a five-way pipe of the frame. During installation, the left connecting wrist 3 is locked into the left end of the five-way pipe of the bicycle by means of threads on the left connecting wrist, the right connecting wrist 4 is locked into the right end of the five-way pipe of the bicycle by means of threads on the right connecting wrist, after assembly is completed, the middle shaft 1 can be driven by the crank to rotate freely, and the elastic sleeve 2 rotates along with the middle shaft 1.

In order to prevent the middle shaft 1 and the elastic sleeve 2 from directly contacting and rubbing with the left connecting wrist 3 or the right connecting wrist 4 in the rotating process to cause abrasion damage of relevant parts, a first supporting bearing 5 is arranged between the left connecting wrist 3 and the middle shaft 1, and a second supporting bearing 6 is arranged between the right connecting wrist 4 and the elastic sleeve 2.

The key improvement of the embodiment is that the torque sensor system is also provided with a magnetic steel 7, a Hall sensor 8 corresponding to the magnetic steel, a cylindrical support 9, a small coil 10, a first circuit board 11 connected with the small coil in a circuit mode, a large coil 13 and a second circuit board 12 connected with the large coil in a circuit mode. Wherein:

the magnetic steel 7 and the Hall sensor 8 are both fixed on the elastic sleeve 2, and the magnetic steel 7 and the Hall sensor 8 are arranged at a certain distance in the axis direction of the elastic sleeve 2. Thus, when the elastic sleeve 2 is deformed in a circumferential direction, the relative position between the magnetic steel 7 and the hall sensor 8 changes.

The cylindrical bracket 9 is sleeved outside the middle shaft 1, in fig. 3, the left end of the cylindrical bracket 9 is inserted into the left connecting wrist 3, and the outer peripheral surface of the cylindrical bracket 9 is arranged in contact with the inner peripheral surface of the left connecting wrist 3. Thus, when the sensor system is mounted on the bottom bracket of the electric bicycle, the positions of the cylindrical bracket 9, the left connecting wrist 3 and the bottom bracket are relatively fixed by the contact friction force between the cylindrical bracket 9 and the left connecting wrist 3.

The small coil 10 and the first circuit board 11 are both fixedly mounted on the central shaft 1, and the first circuit board 11 is in circuit connection with the hall sensor 8. When the central shaft 1 is driven by the crank to rotate, the small coil 10 fixed on the central shaft and the first circuit board 11 rotate along with the central shaft.

The large coil 13 and the second circuit board 12 are both fixedly mounted on the cylindrical support 7, and the large coil 13 and the small coil 10 are mutually matched to form a coupling coil group. In practical application, the large coil 13 and the second circuit board 12 are fixed relative to the frame and cannot rotate along with the middle shaft 1.

When riding passerby and trampling the crank and drive axis 1 and rotate, axis 1 at first drives the left end synchronous rotation of elastic sleeve 2, and the torsional moment that the 2 left end portions of elastic sleeve received transmits to its right-hand member portion to drive the assembly and rotate at the chain wheel of elastic sleeve right-hand member portion, the chain wheel passes through the chain and drives the bicycle rear wheel and rotate, and then makes the bicycle move ahead. In the process, the elastic sleeve 2 is subjected to a circumferential torsion force to generate torsion deformation, the larger the torsion force (related to the pedaling force of a rider and the running resistance of a bicycle), the larger the torsion deformation amount of the elastic sleeve 2, the larger the relative displacement between the magnetic steel 7 and the hall sensor 8 on the elastic sleeve 2, the hall sensor 8 senses the change of the magnetic steel and generates a corresponding analog voltage signal, the first circuit board 11 processes the analog voltage signal and then performs voltage-frequency conversion to output a rectangular wave with a certain frequency, then the rectangular wave is FSK modulated with a power supply sine wave in the small coil 10, the frequency signal is transmitted to the large coil 13 through the coupling coil, and finally the second circuit board 12 is demodulated and analyzed to obtain a torque signal acting on the elastic sleeve 2.

In order to ensure the stability of the installation position of the cylindrical support 9 and prevent the cylindrical support 9 from being displaced during use, a third support bearing 14 is provided between the cylindrical support 9 and the bottom bracket 1 in the present embodiment.

The third support bearing 14 is housed inside the left wrist 3, and the cylindrical bracket 9 is radially interposed between the left wrist 3 and the third support bearing 14.

The large coil 13 and the small coil 10 are concentrically arranged and axially aligned with each other at both end faces to obtain a better electromagnetic coupling effect.

In order to transmit the torque signal obtained by the analysis of the second circuit board 12 to the driving motor of the electric bicycle to adjust the output power and speed of the driving motor according to the magnitude of the torque signal, the signal outgoing line for connecting the motor controller is connected to the second circuit board 12, and the cylindrical bracket 9 is provided with a threading hole for the signal outgoing line to pass through.

It should be understood that the above-mentioned embodiments are only illustrative of the technical concepts and features of the present application, and the present application is not limited thereto. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.