JP2019535590A - Torque sensing device and electric assist bicycle using the torque sensing device - Google Patents

Abstract

Embodiments of the present invention have proposed a torque sensing device and an electric assist bicycle used in an electric assist bicycle. The torque sensing device includes a center shaft, a fixed component fixed to the electric assist bicycle, and a rotating component that rotates together with the center shaft of the electric assist bicycle, in which a strain sensor is installed on the rotating component, and When rotating the rotating component, the strain sensor detects the torque of the center shaft, converts the torque into a torque electric signal and outputs the signal, the fixed component includes a fixed component circuit board, and the rotating component rotates. The fixed component circuit board or the rotating component circuit board is provided with a processing unit for receiving and processing the torque electric signal.

Description

  The present invention relates to the field of electrically assisted bicycles, and more particularly to a torque sensing device and an electrically assisted bicycle using the torque sensing device.

  The torque sensing device is mainly used for measuring various torques, rotation speeds, and mechanical efficiencies, and converts torque changes into electric signals. Its accuracy is related to the accuracy of the test system to which it belongs. Its main features are that it can measure not only static torque, but also rotational torque and dynamic torque, high measurement accuracy, good stability, strong interference prevention, and forward and reverse without repeating zero adjustment. The rotational torque can be continuously measured, there is no consumable part such as a conductive ring, it can be operated at a high rotational speed for a long time, and a high level frequency signal can be output and transmitted directly to a computer for processing.

When applied to a power-assisted bicycle, there are mainly three types of torque sensing devices as follows.
1. Rear hook sensor, this kind of sensor is installed at the rear of the bicycle, it is necessary to transfer power to this part via crank, sprocket and chain, and there are too many intermediate stages to go through, so sensing May cause inaccuracies.
2. A torsion spring sensor, this type of sensor uses a spring as a sensing member, so it is not comfortable in the process of stepping on, and is liable to cause sensor failure due to metal fatigue.
3. Magnetic induction type torque sensor, this kind of sensing device is compact in structure and saves space, but since the magnitude of torque is sensed through the method of magnetic induction change, this type of measurement is not subject to interference of external magnetic field. It is easy to receive, and there is a risk of causing deviations in measurement results.

  In order to solve the problems existing in the prior art, an embodiment of the present invention proposes a torque sensing device and a motor-assisted bicycle applying the torque sensing device, thereby at least partly prior art torque sensing. Solve the problems that exist in the device.

  In one embodiment, the present invention includes a middle shaft, a stationary component fixed to the electric assist bicycle, and a rotating component that rotates together with the middle shaft of the electric assist bicycle, wherein the rotating component is provided with a strain sensor, and the middle shaft is When rotating the rotating component, the strain sensor detects the torque of the central shaft, converts the torque into a torque electric signal and outputs the torque, the fixed component includes a fixed component circuit board, and the rotating component is the rotating component. Proposed a torque sensing device for use in a power-assisted bicycle comprising a circuit board, wherein the fixed component circuit board or the rotating component circuit board is provided with a processing unit for receiving and processing the torque electrical signal .

  In another embodiment, the present invention is an electrically assisted bicycle including a vehicle body and wheels connected to the vehicle body, the electrically assisted bicycle further including a torque sensing device, wherein the torque sensing device is a middle shaft, A stationary component fixed to the electric assist bicycle and a rotating component that rotates together with a central axis of the electric assist bicycle; a strain sensor is installed on the rotating component; a strain direction of the strain sensor is a torque received by the rotating component When the central shaft rotates the rotating component, the strain sensor detects the torque of the central shaft, converts the torque into a torque electric signal and outputs it, and the fixed component is fixed. A rotating component circuit board, and the fixed component circuit board or the rotating circuit. Component circuit board proposed a motor-assisted bicycle for use in power-assisted bicycle comprising a processing unit for receiving and processing said torque electrical signals.

  In the torque sensing device and the electric assist bicycle proposed by the present invention, the strain sensor is installed on the rotating component, and the fixed component circuit board or the rotating component circuit board for receiving the torque electric signal output from the strain sensor is used as the strain sensor. Since it is installed at a close position, the present invention provides a torque sensing device and a power-assisted bicycle that have a simple structure and stable and accurate signal transmission. Compared to existing rear hook sensors, the present invention has a simple structure, fewer power transmission steps, and accurate sensing. Compared to the torsion spring sensor, the present invention has no problem of metal fatigue, does not affect power transmission, and the sensor state is stable. Compared with a magnetic induction type sensor, the present invention provides a more accurate measurement result.

Various other advantages and advantages will become apparent to those skilled in the art from the following detailed description of the preferred embodiment. The drawings are for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. The same parts are denoted by the same reference numerals in all the drawings.
FIG. 1 is an exploded schematic view of a torque sensing device according to an embodiment of the present invention. FIG. 2 is a schematic view from the first angle of the torque sensing device according to one embodiment of the present invention. FIG. 3 is a schematic view from the second angle of the torque sensing device according to one embodiment of the present invention. FIG. 4 is a schematic diagram of a central shaft unit of the torque sensing device according to one embodiment of the present invention. FIG. 5 is a schematic view from the first angle of the chain gear and the rotating component of the torque sensing device in one embodiment of the present invention. FIG. 6 is a schematic view from the second angle of the chain gear and the rotating component of the torque sensing device in one embodiment of the present invention. FIG. 7 is a front view of an electrically assisted bicycle according to an embodiment of the present invention. FIG. 8 is a top view of FIG. FIG. 9 is a partially enlarged schematic view of FIG. FIG. 10 is a block diagram of signal connection of a fixed component and a rotating component of the torque sensing device according to one embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings and examples.

  What has been described above is merely an example of the present invention, and does not limit the protection scope of the present invention. Equivalent structure or equivalent flow conversions made using the contents of the specification and drawings of the present invention, or application to other related technical fields, directly or indirectly, for the same reason are covered by the patent protection scope of the present invention. include.

  FIG. 1 is an exploded schematic view of a torque sensing device in one embodiment of the present invention, and FIGS. 2 and 3 are schematic views of the torque sensing device of the embodiment of the present invention observed from two angles, respectively. As shown in FIGS. 1, 2, and 3, the torque sensing device applied to the electric assist bicycle rotates together with the middle shaft 10, the fixed component 20 fixed to the electric assist bicycle, and the middle shaft 10 of the electric assist bicycle. A rotating component 30 is included. Among them, the rotating component 30 is provided with a strain sensor 30a, and the strain direction of the strain sensor 30a may be the same as the direction of torque received by the rotating component 30, for example. When the middle shaft 10 rotates the rotating component 30, the strain sensor 30a detects the torque in the middle shaft 10, and converts the torque into a torque electric signal and outputs it. The fixed component 20 includes a fixed component circuit board (not shown in FIG. 1 and a component denoted by reference numeral 221 in FIGS. 2 and 3), and the rotating component 30 is a rotating component circuit board (not shown in FIG. 1 and denoted in FIG. 3). 321 parts). The fixed component circuit board 221 or the rotating component circuit board 321 is provided with a processing unit that receives and processes the torque electric signal.

  In one embodiment, preferably the rotating component 30 includes an engagement rod 40. The engaging rod 40 is a component for fixedly connecting the rotating component 30 and the central shaft 10, and the engaging rod 40 may be integrated with other components of the rotating component 30, or may be processed and attached respectively. good. Although the strain sensor 30a in the present embodiment is installed on the engagement rod 40, in other embodiments, the strain sensor 30a may be installed at a different position on the rotating component 30.

  In one embodiment, the fixed component 20 may further include a fixed component power supply coil 222 for supplying power to the fixed component circuit board 221, and the rotating component 30 further supplies a rotating component power supply for supplying power to the rotating component circuit board 321. A coil 322 may be included.

  In one embodiment, the fixed component 20 includes a fixed component case 21 and a fixed component cover 22, and the fixed component circuit board 221 and the fixed component feeding coil 222 are accommodated between the fixed component case 21 and the fixed component cover 22. A storage space is formed. The rotating component 30 includes a rotating component claw-equipped board 31 and a rotating component cover 32. The rotating component circuit board 321 and the rotating component feeding coil 322 are accommodated between the rotating component claw-equipped board 31 and the rotating component cover 32. A space is formed.

  In one embodiment, the fixed component 20 and the rotating component 30 are installed facing each other and each has a shaft hole through which the middle shaft 10 passes. The fixed component 20 includes a hall sensor (not shown) installed on the fixed component circuit board 221, and the rotating component 30 includes magnet steel 323. When the rotating part 30 rotates, the magnet steel 323 faces the Hall sensor as it passes through the Hall sensor. When the magnet steel 323 and the hall sensor face each other, the hall sensor detects the rotational speed of the magnet steel 323 and transmits it to the processing unit. In one embodiment, the processor may be installed on a stationary component circuit board 221 or a rotating component circuit board 321 or other part of a power assisted bicycle. In the present invention, this is not particularly limited.

  In one embodiment, the magnet steel 323 is installed on the rotating component cover 32, and the fixed component cover 22 and the rotating component cover 32 are installed next to each other and facing each other. There may be a plurality of magnet steels 323, which may be evenly distributed so as to surround the center of the rotating component cover 32. As the rotating component 30 rotates, each magnet steel 323 faces the Hall sensor as it passes through the Hall sensor.

  Below, each part of the said torque sensing apparatus is demonstrated combining several drawing.

  First, as shown in FIGS. 1 to 3, the fixed component 20 and the rotating component 30 in the embodiment of the present invention are mounted on the middle shaft 10. Among them, the fixing component 20 is installed on the electric assist bicycle and is fixed relatively to a frame (not shown) of the electric assist bicycle. The rotating component 30 can be installed on the side of the bottom bracket of an electrically assisted bicycle, for example. The rotating component 30 is mounted on the middle shaft 10, and the rotating component 30 is fixedly connected to the middle shaft 10 via the engagement rod 40 so as to rotate together with the middle shaft 10. 2 and 3, the fixed component 20 includes a fixed component case 21 and a fixed component cover 22. The fixed component cover 22 is connected to the fixed component case 21 by, for example, a snap method or a screw connection method. A storage space for storing the fixed component circuit board 221 and the fixed component feeding coil 222 is formed between the two. The rotating part 30 also has a rotating part claw-equipped board 31 and a rotating part cover 32. The rotating part cover 32 is connected to the rotating part claw-equipped board 31 by a snap method or a screw connection method, and rotates between them. A storage space for storing the component circuit board 321 and the rotating component power supply coil 322 is formed.

  2 and 3, the fixed component circuit board 221 and the fixed component feeding coil 222 are installed on the fixed component cover 22, and the rotating component circuit board 321 and the rotating component feeding coil 322 are installed on the rotating component cover 32. Among them, the fixed component feeding coil 222 may be a feeding coil, and the rotating component feeding coil 322 may be a receiving coil. The fixed component power supply coil 222 is connected to the battery of an external electrically assisted bicycle, thereby supplying electricity to the rotating component power supply coil 322 via the fixed component power supply coil 222.

  In the present embodiment, the fixed component cover 22 and the rotating component cover 32 are installed to face each other, and a magnet steel 323 is installed on the rotating component cover 32. There is at least one magnet steel 323.

  In one embodiment, FIG. 4 shows an exploded schematic view of the middle shaft unit including the middle shaft 10. As shown in FIG. 4, the middle shaft unit includes a middle shaft 10, a pair of bearings 12, a middle shaft sleeve 13, and a pair of adapter nuts 14.

  FIG. 4 is a schematic diagram of the middle shaft 10, the paired bearing 12, the middle shaft sleeve 13, and the paired adapter nut 14 included in the middle shaft unit. As shown in FIG. 4, the bearings 12 are fitted into the two adapter nuts 14 so as to correspond to each other, and the middle shaft sleeve 13 is mounted on the middle shaft 10 so as to limit the position of the bearing 12. Located between the bearings 12.

  As shown in FIGS. 2 and 3, the fixed component 20 and the rotating component 30 are provided with shaft holes for drilling the middle shaft 10. Among them, the rotating component 30 is fixed to the middle shaft 10 via the engagement rod 40. The fixed component 20 is installed on the vehicle body and does not rotate with the middle shaft 10. The fixed component circuit board 221 and the fixed component feeding coil 222 are installed on the fixed component cover 22. Among them, the fixed component feeding coil 222 is closer to the fixed component cover 22 than the fixed component circuit board 221. That is, the fixed component feeding coil 222 is located between the fixed component circuit board 221 and the fixed component cover 22. It should be noted that the fixed component feeding coil 222 and the fixed component circuit board 221 are all installed so as to surround the shaft hole of the fixed component 20.

  The rotating component circuit board 321 and the rotating component feeding coil 322 are installed on the rotating component cover 32. Among them, the rotating component feeding coil 322 is closer to the rotating component cover 32 than the rotating component circuit board 321. That is, the rotating component power supply coil 322 is positioned between the rotating component circuit board 321 and the rotating component cover 32. It should be noted that the rotating component power supply coil 322 and the rotating component circuit board 321 are all installed so as to surround the shaft hole of the rotating component 30.

  In one embodiment, the torque sensing device further includes a chain gear 50. The structure of the chain gear 50 is shown in FIGS. FIG. 5 and FIG. 6 are schematic views of a structure in which the chain gear 50 and the rotating part claw-equipped board 31 observed from different angles are engaged with each other. As shown in combination with FIG. 5 and FIG. 6, the chain gear 50 is connected to the center shaft 10 via the rotary component claw-equipped board 31. The chain gear 50 includes a chain gear main body 52, a connection portion 53, and a belt block plate 51. Among them, the chain gear main body 52 is connected to the rotary component claw-equipped board 31 through a connection portion 53. The connection portion 53 is provided with a weight reduction groove 53a. Corresponding belt block plates 51 are installed on both sides of the chain gear body 52. Among them, the dimension of one belt block plate 51 (for example, the left side in FIG. 5) is larger than the dimension of the other belt block plate 51 (for example, the right side in FIG. 5). The two sets of belt block plates 51 are alternately installed to facilitate attachment of the belt.

  In one embodiment, the strain sensor 30a is attached to the engaging rod 40 as described above. In order to receive and process the strain data of the strain sensor 30a, the rotating component circuit board 321 is provided with a signal processing unit (not shown) that cooperates with the strain sensor 30a. The fixed component 20 is fixed to the frame. The fixed component circuit board 221 is provided with a hall sensor (not shown) for cooperating with the magnet steel 323. When the magnet steel 323 rotates and passes through the hall unit, the number of passes per unit time is recorded, so that the parameters of stepping speed and frequency can be obtained.

  The above processing unit calculates the speed at which the electrically assisted bicycle is stepped on based on the rotational speed of the magnet steel 323, determines the current running state based on the stepped-on speed and the torque electric signal, and outputs the assist force to the wheels. The driving device is controlled. The traveling state includes an uphill or acceleration state, a downhill state, and a normal traveling state. Among them, when the traveling state is an uphill or acceleration state, the processing unit controls the drive device so as to increase the output assist force. When the running state is a downhill state, the processing unit controls the driving device so as to reduce the output assist force. When the running state is the normal running state, the processing unit controls the driving device so as to maintain the current output assist force. The processing unit determines the driving state smartly and efficiently based on the torque signal and the stepping speed of the vehicle and provides power, so that the burden on the passenger can be reduced.

  FIG. 7 is a front view of an electrically assisted bicycle according to an embodiment of the present invention. FIG. 8 is a top view of FIG. FIG. 9 is a partially enlarged schematic view of FIG. As shown in FIGS. 7, 8, and 9, the embodiment of the present invention has proposed a power-assisted bicycle including a vehicle body 100 and wheels 200 connected to the vehicle body 100. The electric assist bicycle further includes the torque sensing device described above. The torque sensing device includes a central shaft 10, a fixed component 20 fixed to the electric assist bicycle, and a rotating component 30 that rotates together with the central shaft 10 of the electric assist bicycle. Among them, the rotary sensor 30 is provided with a strain sensor 30a, and the strain direction of the strain sensor 30a is, for example, the same as the direction of torque received by the rotary component 30. When the middle shaft 10 rotates the rotating component 30, the strain sensor 30a detects the torque of the middle shaft 10, and converts the torque into a torque electric signal and outputs it. The fixed component 20 includes a fixed component circuit board 221. The rotating component 30 includes a rotating component circuit board 321. The fixed component circuit board 221 or the rotating component circuit board 321 is provided with a processing unit (not shown) for receiving and processing a torque electric signal.

  In one embodiment, as shown in FIG. 9, the fixing component 20 is installed on one of the bottom brackets 120 of the electrically assisted bicycle. An elastic sleeve 31 a is mounted on the center shaft 10 on the side with respect to the rotating component 30, and the elastic sleeve 31 a is installed between the crank 110 and the bottom bracket 120 of the electrically assisted bicycle. The elastic sleeve 31a ensures that the distance between the two fixed parts 20 and the rotating part 30 of the electrically assisted bicycle is opposed to each other, and the power supply is interrupted. It is used so as not to lose power.

  In one embodiment, the fixed component 20 further includes a fixed component power supply coil 222 for supplying power to the fixed component circuit board 221, and the rotary component 30 further includes a rotary component power supply coil 322 for supplying power to the rotary component circuit board 321. Have.

  In one embodiment, the fixed component 20 includes a fixed component case 21 and a fixed component cover 22, and a storage for storing the fixed component circuit board 221 and the fixed component feeding coil 222 between the fixed component case 21 and the fixed component cover 22. A space is formed. The rotating component 30 includes a rotating component claw-equipped board 31 and a rotating component cover 32, and a storage space for accommodating the rotating component circuit board 321 and the rotating component feeding coil 322 between the rotating component claw-equipped board 31 and the rotating component cover 32. Is formed.

  In one embodiment, the rotating component 30 includes an engagement rod 40 for fixedly connecting the rotating component 30 and the middle shaft 10. The strain sensor 30 a is installed on the engagement rod 40.

  In one embodiment, the fixed component 20 and the rotating component 30 are installed facing each other and each has a shaft hole through which the middle shaft 10 passes. The fixed component 20 includes a hall sensor installed on the fixed component circuit board 221, and the rotating component 30 includes magnet steel 323. When the rotating part 30 rotates, the magnet steel 323 faces the Hall sensor as it passes through the Hall sensor. When the magnet steel 323 and the hall sensor face each other, the hall sensor detects the rotational speed of the magnet steel 323 and transmits it to the processing unit.

  In one embodiment, the magnet steel 323 is installed on the rotating component cover 32, and the fixed component cover 22 and the rotating component cover 32 are installed next to each other and facing each other. There may be a plurality of magnet steels 323, which may be evenly distributed so as to surround the center of the rotating component cover 32. As the rotating component 30 rotates, each magnet steel 323 faces the Hall sensor as it passes through the Hall sensor.

  In one embodiment, as shown in FIG. 5, the electrically assisted bicycle further includes a chain gear 50. The chain gear 50 includes a chain gear main body 52, a connection portion 53, and a belt block plate 51. The chain gear main body 52 is connected to the rotating part claw-equipped board 31 through the connection portion 53. The belt block plate 51 is installed on both sides of the chain gear body 52. The connection portion 53 is provided with a weight reduction groove.

  In one embodiment, as shown in FIG. 5, the belt block plates 51 located on both sides of the chain gear 50 have protrusions 51a and 51b, respectively. The protrusions 51a and 51b of the belt block plates 51 on both sides are alternately arranged, and the dimension of one protrusion 51a is larger than the dimension of the other protrusion 51b so as to facilitate attachment.

  In one embodiment, the processing unit calculates the speed at which the electrically assisted bicycle is stepped on based on the rotational speed of the magnet steel 323, determines the current running state based on the stepped-on speed and the torque electric signal, and outputs the assist force to the wheels. The drive device is controlled to do so. Among them, the driving device may be, for example, a motor mounted on the body of an electrically assisted bicycle.

  In one embodiment, the running state includes an uphill or acceleration state, a downhill state, and a normal running state. Among them, when the traveling state is an uphill or acceleration state, the processing unit controls the drive device so as to increase the output assist force. When the running state is a downhill state, the processing unit controls the driving device so as to reduce the output assist force. When the running state is the normal running state, the processing unit controls the driving device so as to maintain the current output assist force.

  FIG. 10 is a block diagram of signal connection of the fixed component 20 and the rotating component 30 of the torque sensing device according to one embodiment of the present invention. The wireless transmission part is shown in combination with FIG. 10 with reference to patent application CN104655340A. As can be seen from FIG. 10, the fixed component circuit board 221 is provided with a first wireless communication unit 221a, a first control unit 221b, a receiving coil 221c, and a first power supply unit 221d. On the rotating component circuit board 321, a second wireless communication unit 321a, a second control unit 321b, an output coil 321c, a second power supply unit 321d, and a digital-analog converter 321e are installed. Since wireless transmission of signals can be realized from the above, it is not a luxury here.

  As described above, in the embodiment of the present invention, the torque sensing device and the electrically assisted bicycle including the torque sensing device have at least the following technical effects. In the torque sensing device and the electric assist bicycle proposed by the present invention, the strain sensor is installed on the rotating component, and the fixed component circuit board or the rotating component circuit board for receiving the torque electric signal output from the strain sensor is used as the strain sensor. Since it is installed at a close position, the present invention provides a torque sensing device and a power-assisted bicycle that have a simple structure and stable and accurate signal transmission. Compared to existing rear hook sensors, the present invention has a simple structure, fewer power transmission steps, and accurate sensing. Compared to a torsion spring sensor, the present invention has no problem of metal fatigue, does not affect power transmission, and the state of the sensor is stable. Compared to a magnetic induction type sensor, the measurement result of the present invention is more accurate.

  Furthermore, in the torque sensing device and the electrically assisted bicycle according to the present invention, the processing unit smartly and efficiently determines the running state based on the torque signal and the stepping speed of the vehicle, and provides power, thereby reducing the burden on the passenger. It can be reduced.

  In addition, the speed sensor composed of a hall sensor and magnet steel can measure the frequency and speed of stepping on, and at the same time obtain the work rate of stepping on the human pedal by combining the magnitude of the instantaneous torque measured by the torque sensor. be able to. This work rate is displayed through a mobile phone or an external display to which the system is wirelessly connected, and the user is informed of the current boarding situation by presenting a clear display to the user.

  In the present specification, “one embodiment”, “an embodiment”, or “one or more embodiments” refers to a specific feature, structure, or characteristic described in combination with the embodiment. It is included in. By the way, it should be noted here that not all phrase examples such as “in one embodiment” refer to the same embodiment.

  Although many specific details have been described in the specification provided herein, it will be understood that embodiments of the invention may be practiced in the absence of these specific details. In some instances, well known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this specification.

  It should be noted that the above examples do not limit the present invention, but merely illustrate. Those skilled in the art can then design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limitations on the claim. The word “comprising” does not exclude elements or steps not listed in a claim. A "one" or "one" preceding an element does not deny the presence of a plurality of such elements. The present invention can be realized by hardware having several different elements and a suitably programmed computer. In a unit claim enumerating several devices, some of these devices can be specifically implemented by the same hardware. Uses such as first, second and third do not represent any order. These words can be interpreted as names.

  It should also be noted that the language used herein has been selected for readability and teaching purposes and not for the purpose of interpreting or limiting the spirit of the present invention. Thus, it will be apparent to those skilled in the art that many modifications and variations can be made without departing from the scope of the appended claims. With respect to the scope of the present invention, the disclosure made to the present invention is for the purpose of illustration and is not intended to limit the present invention. The protection scope of the present invention is limited by the appended claims.

Claims (20)

  A torque sensing device for use in an electric assist bicycle having a middle shaft, a fixed component fixed to the electric assist bicycle and a rotating component that rotates together with the middle shaft of the electric assist bicycle, wherein a strain sensor is installed on the rotating component, When the middle shaft rotates the rotating component, the strain sensor detects the torque of the middle shaft, converts the torque into a torque electric signal and outputs the torque, the fixed component includes a fixed component circuit board, and the rotation An electrically assisted bicycle characterized in that a component includes a rotating component circuit board, and the fixed component circuit board or the rotating component circuit board includes a processing unit for receiving and processing the torque electric signal. Torque sensing device to be used.   The fixed component further has a fixed component feeding coil for feeding power to the fixed component circuit board, and the rotating component further has a rotating component feeding coil for feeding power to the rotating component circuit board. Item 2. The torque sensing device according to Item 1.   The fixed component includes a fixed component case and a fixed component cover, and a storage space for storing the fixed component circuit board and the fixed component feeding coil is formed between the fixed component case and the fixed component cover. The rotating component includes a rotating component clawed disk and a rotating component cover, and a storage space for storing the rotating component circuit board and the rotating component feeding coil is formed between the rotating component clawed disk and the rotating component cover. The torque sensing device according to claim 2, wherein the torque sensing device is provided.   The torque / rotational component according to claim 1, wherein the rotating component includes an engaging rod for fixedly connecting the rotating component and the central shaft, and the strain sensor is installed on the engaging rod. Sensing device.   The fixed component and the rotating component are installed facing each other, each having a shaft hole through which the central shaft passes, and the fixed component includes a hall sensor installed on the fixed component circuit board, and the rotating component Includes magnet steel, and when the rotating part rotates, the magnet steel faces the hall sensor when passing the hall sensor, and when the magnet steel and the hall sensor face each other, 2. The torque sensing device according to claim 1, wherein the hall sensor detects a rotation speed of the magnet steel and transmits the rotation speed to the processing unit.   The fixed component includes a fixed component case and a fixed component cover, the rotating component includes a disk with a rotating component claw and a rotating component cover, and the fixed component circuit board has a storage space formed by the fixed component case and the fixed component cover. 6. The torque / motor according to claim 5, wherein the magnet steel is installed on the rotating component cover, and the fixed component cover and the rotating component cover are installed adjacent to and opposite to each other. Sensing device.   A plurality of the magnet steels are distributed in an annular shape so as to surround the center of the rotating part cover. When the rotating parts rotate, each magnet steel faces the hall sensor when passing through the hall sensor. The torque sensing device according to claim 5, wherein   An electrically assisted bicycle including a vehicle body and a wheel connected to the vehicle body, wherein the electrically assisted bicycle further includes a torque sensing device, and the torque sensing device is a middle part and a fixed part fixed to the electrically assisted bicycle. And a rotating part that rotates together with the middle shaft of the electrically assisted bicycle, a strain sensor is installed on the rotating part, and the strain direction of the strain sensor is the same as the direction of the torque received by the rotating part, and the middle shaft is rotated. When rotating a component, the strain sensor detects the torque of the central shaft, converts the torque into a torque electric signal and outputs the torque, the fixed component includes a fixed component circuit board, and the rotating component is a rotating component circuit. The fixed component circuit board or the rotating component circuit board outputs the torque electric signal. Power-assisted bicycle to be used for power-assisted bicycle characterized in that it comprises a processing unit for processing by signal.   The fixed component further has a fixed component feeding coil for feeding power to the fixed component circuit board, and the rotating component further has a rotating component feeding coil for feeding power to the rotating component circuit board. Item 9. The electrically assisted bicycle according to Item 8.   The fixed component includes a fixed component case and a fixed component cover, and a storage space for storing the fixed component circuit board and the fixed component feeding coil is formed between the fixed component case and the fixed component cover. The rotating component includes a rotating component clawed disk and a rotating component cover, and a storage space for storing the rotating component circuit board and the rotating component feeding coil is formed between the rotating component clawed disk and the rotating component cover. The electrically assisted bicycle according to claim 9, wherein the bicycle is a bicycle.   The electric assist according to claim 8, wherein the rotating component includes an engaging rod for fixedly connecting the rotating component and the central shaft, and the strain sensor is installed on the engaging rod. bicycle.   The fixed component and the rotating component are installed facing each other, each having a shaft hole through which the central shaft passes, and the fixed component includes a hall sensor installed on the fixed component circuit board, and the rotating component Includes magnet steel, and when the rotating part rotates, the magnet steel faces the hall sensor when passing the hall sensor, and when the magnet steel and the hall sensor face each other, 9. The electric assist bicycle according to claim 8, wherein the hall sensor detects a rotation speed of the magnet steel and transmits the rotation speed to the processing unit.   The fixed component includes a fixed component case and a fixed component cover, the rotating component includes a disk with a rotating component claw and a rotating component cover, and the fixed component circuit board has a storage space formed by the fixed component case and the fixed component cover. 13. The electric assist according to claim 12, wherein the magnet steel is installed on the rotating component cover, and the fixed component cover and the rotating component cover are installed adjacent to each other and facing each other. bicycle.   The magnet steel is a plurality, and is distributed in an annular shape so as to surround the center of the rotating part cover. When the rotating part rotates, each magnet steel passes with the hall sensor when passing through the hall sensor. The power-assisted bicycle according to claim 12, which faces each other.   The electric assist bicycle further includes a chain gear, the chain gear includes a chain gear main body, a connection portion, and a belt block plate, and the chain gear main body is connected to the disk with the rotating part claw by the connection portion, and the belt block 14. The electrically assisted bicycle according to claim 13, wherein the plates are installed on both sides of the chain gear body, and a weight reduction groove is installed in the connecting portion.   The belt block plates located on both sides of the chain gear have projections, the projections on the belt block plates on both sides are alternately installed, and the size of one of the projections is larger than the size of the other projection. The electrically assisted bicycle according to claim 15.   The electrically assisted bicycle according to claim 8, wherein the fixed component is installed on one of bottom brackets of the electrically assisted bicycle.   The processing unit calculates the speed at which the electrically assisted bicycle is stepped on based on the rotation speed of the magnet steel, determines the current running state based on the stepping speed and the torque electric signal, and outputs assist force to the wheels. The electric assist bicycle according to claim 12, wherein the driving device is controlled to do so.   The traveling state includes an uphill or acceleration state, a downhill state, and a normal traveling state, and when the traveling state is an uphill or acceleration state, the processing unit increases the output assist force. When the driving device is controlled and the traveling state is a downhill state, the processing unit controls the driving device to reduce the output assist force, and when the traveling state is a normal traveling state, the processing The electric assist bicycle according to claim 18, wherein the unit controls the driving device so as to maintain the current output assist force.   The electrically assisted bicycle according to claim 19, wherein an elastic sleeve is mounted on a central shaft on a side of the rotating component, and the elastic sleeve is disposed between a crank and a bottom bracket of the electrically assisted bicycle.