CN216433328U - Torque sensor of electric bicycle - Google Patents
Torque sensor of electric bicycle Download PDFInfo
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- CN216433328U CN216433328U CN202122493071.8U CN202122493071U CN216433328U CN 216433328 U CN216433328 U CN 216433328U CN 202122493071 U CN202122493071 U CN 202122493071U CN 216433328 U CN216433328 U CN 216433328U
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- circuit board
- signal processing
- processing circuit
- coil
- torque sensor
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Abstract
The torque sensor of the electric bicycle comprises a center shaft, an induction coil, a signal processor and a strain sleeve, wherein the strain sleeve is arranged on the center shaft, the center shaft is connected with and driven by a bicycle chain wheel, the periphery of the strain sleeve is provided with the induction coil and the signal processor connected with the induction coil, the induction coil is arranged on a coil framework, the periphery of the coil framework is provided with a groove hole for installing a signal processing circuit board of the signal processor, and the signal processing circuit board is fixed with the groove hole in a buckling mode. The utility model provides a torque sensor of electric bicycle makes the groove cave that has the draw-in groove in coil skeleton periphery, can swiftly fix the circuit board, then directly coats sealed glue on surface to improve the quality of coating sealed glue, improve the security and the reliability of circuit, the auxiliary fixtures instrument that needs when reducing the sealed glue of surface coating, raise the efficiency, reduce cost.
Description
Technical Field
The utility model relates to an electric bicycle field especially relates to a torque sensor of electric bicycle.
Background
The traditional electric bicycle is regulated by using a handle, namely the handle is used for controlling the output power of a motor, more and more electric bicycles are provided with torque sensors arranged on a center shaft at the present stage, so that the pedaling force of the foot of a person during riding can be converted into corresponding voltage signal output in the riding process, the frequency signal output of the center shaft in different rotating speed states can be realized through a Hall element, and the power output of the motor is controlled after the signal processing of a motor control circuit board, so that the pedaling force of the foot of the person during riding can be greatly saved.
The detection method adopted in the industry realizes torque measurement by detecting stress or strain generated by the middle shaft under the action of torque, namely, the change of a magnetic field is caused by the change of the stress or strain, so that the exciting coil, the detecting coil, the signal processing unit and the Hall element realize signal output of the middle shaft at different rotating speeds and different torque states, and the power output of the motor is controlled by the motor controller.
At present, the stress or strain on the middle shaft is realized through a strain sleeve, and the stress or strain is mainly as follows: adhering a resistance strain gauge; adhering an amorphous alloy thin strip; electroplating, spraying or sputtering a layer of amorphous alloy material with inverse magnetostriction effect; selecting high magnetic conductive materials with inverse magnetostriction effect, and the like; the space for installing the sensor and the detection system in the electric bicycle middle shaft is limited, and the size of the strain sleeve manufactured by the process is basically consistent, so that the space for placing the detection circuit board is limited, and meanwhile, the sealing and the water resistance of the torque sensor are a key process, which are related to the working stability and the anti-interference capability of the torque sensor.
The common scheme in the prior art is to make a groove of the circuit board at the periphery of the coil framework for placing the circuit board, and then directly coat the sealant on the surface of the circuit board. Because the circuit board is not fixed relative to the groove hole, the torque sensor works and fails under the influence of moisture and rainwater after long-time use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a torque sensor of electric bicycle makes it can swiftly fix the circuit board to improve the security and the reliability of circuit.
In order to realize the above object, the utility model provides an electric bicycle's torque sensor's detecting system, it includes axis, induction coil, signal processor, strain cover and set up epaxially, and the axis is connected with the bicycle sprocket and by its drive, strain cover set up induction coil and with the signal processor who is connected induction coil in the periphery, and induction coil installs on coil skeleton, its characterized in that: the periphery of the coil framework is provided with a groove hole for mounting a signal processing circuit board of the signal processor, and the signal processing circuit board is fixed with the groove hole in a buckling mode.
Preferably, the periphery of the coil framework slot hole is provided with an elastic clamping slot, and the elastic clamping slot clamps the periphery of the signal processing circuit board.
Preferably, the elastic card slot is arranged at a short side of the signal processing circuit board.
Preferably, at least one elastic clamping groove is arranged on each short side of the signal processing circuit board.
Preferably, a hole is arranged in the idle position of the signal processing circuit board, a boss corresponding to the idle position of the signal processing circuit board is arranged on the coil framework, and the boss can be clamped into a hole of the signal processing circuit board to fix the signal processing circuit board.
Preferably, the top of the boss on the coil framework is spherical, so that the coil framework is easily clamped into the signal processing circuit board.
Preferably, a microprocessor chip, an operational amplifier circuit chip, a resistor, a capacitor, a hall, an analog switch tube and a power chip component are integrated on a signal processing circuit board of the signal processor, wherein the microprocessor chip and the operational amplifier circuit chip are sequentially arranged at the middle position of the front side of the signal processing circuit board along the axial direction of the coil framework, and the hall element, the analog switch tube and the power chip component are arranged at the edge position of the back side of the signal processing circuit board.
Preferably, the resistor and the capacitor are arranged at the edge position of the front surface of the signal processing circuit board.
Preferably, the analog switch tube and the power chip component are arranged at the vacant position of the signal processing circuit board.
Preferably, the Hall element is arranged at the edge position of the reverse side of the signal processing circuit board and corresponds to the peripheral surface of the magnetic ring.
Preferably, the magnetic ring is fixed on the middle shaft and is opposite to the magnetic ring Hall sensor, so that the magnetic signal of the magnetic ring can be detected more conveniently, accurately and quickly.
Preferably, the detection system further comprises a coil framework sleeved on the periphery of the strain sleeve, and the induction coil is wound in the wire slot.
Preferably, the detection system further comprises a magnetically conductive cover arranged at the periphery of the induction coil.
The utility model has the advantages that: the utility model provides a torque sensor of electric bicycle makes the groove cave that has the draw-in groove in coil skeleton periphery, can swiftly fix the circuit board, then directly coats sealed glue on surface to improve the quality of coating sealed glue, improve the security and the reliability of circuit, the auxiliary fixtures instrument that needs when reducing the sealed glue of surface coating, raise the efficiency, reduce cost.
The safety and reliability of the circuit are also improved by optimizing the layout of the signal processor.
Drawings
Fig. 1 is a perspective view of a torque sensor of an electric treadmill according to an embodiment of the present invention.
Fig. 2 is an exploded view of the torque sensor of the electric treadmill according to the embodiment of the present invention.
Fig. 3 is a schematic structural view of a strain gauge of a torque sensor of an electric treadmill according to an embodiment of the present invention.
Fig. 4 is a schematic view of the coil bobbin and the circuit board of the torque sensor of the electric treadmill according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of fig. 4 illustrating the installation of the coil frame slot and the circuit board of the torque sensor of the present invention.
Fig. 6 is a schematic diagram of a circuit board of fig. 4 illustrating another installation method of the coil bobbin and the circuit board of the torque sensor of the present invention.
Fig. 7 is a schematic view of another installation method of the torque sensor coil bobbin and the circuit board of the present invention.
Fig. 8 is a schematic diagram of the front layout of the circuit board component according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of a reverse layout of the circuit board component according to the embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a torque sensor according to an embodiment of the present invention.
Fig. 11 is a partially enlarged view of a portion of fig. 10B.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings.
As shown in fig. 1-11, the torque sensor of the electric bicycle comprises a central shaft 1, an induction coil 2, a signal processor 5, a strain sleeve 3, a transmission tube 4 and a magnetic ring 6.
One side 11 of the middle shaft 1 is supported by a left bearing 81 in a rolling manner, the left bearing 81 is connected to a left bearing seat 82, and the left bearing seat 82 can be fixed on a five-way pipe (not shown in the figure) of the electric bicycle.
The other side 12 of the middle shaft 1 is supported by a right bearing 91 in a rolling manner, the right bearing 91 is connected to a right bearing seat 92, and the right bearing seat 82 can be fixed on a five-way pipe (not shown in the figure) of the electric bicycle.
The inner side of one end 35 of the strain sleeve 3 is connected with the middle shaft 1 through a gear 14 and is blocked by a blocking ring 13, and the outer side of the other end of the strain sleeve 3 is connected with the inner side of one end 41 of the transmission pipe 4 through a gear 33.
The other end of the drive tube 4 is provided with a gear 42 which is connected to a bicycle sprocket (not shown).
The strain sleeve 3 is made of a magnetic conductive material, particularly a material with a high magnetostriction coefficient and a high magnetic conductivity, in the embodiment, the strain sleeve 3 is made of 40Cr, and other materials such as 12CrNI3 or 12CrNI4 can be used.
Two lines of vertical strain slender grains 31 and 32 are arranged at intervals in the middle of the strain sleeve along the periphery, and the strain slender grains are uniformly arranged along the periphery of the strain sleeve.
The strain slender grains 32 tend to be 45 degrees in the direction of torsion stretching borne by the central shaft when the electric bicycle is in the advancing direction.
The stress slender line 31 is inclined to the advancing direction of the electric bicycle, and the compression direction of the middle shaft bearing the torsion is 45 degrees.
The periphery of the strain sleeve 3 is provided with an induction coil 2, and the induction coil has two induction coils 21 and 22 in the embodiment.
One end of the coil framework 23 is fixed on the left bearing seat 82, and the other end is fixed on the right bearing seat 92 and sleeved outside the strain sleeve 3.
The coil framework 23 is provided with wire slots 231 and 232 corresponding to the positions of the strain elongated patterns, and the induction coils 21 and 22 are wound in the wire slots 231 and 232.
The induction coils 21, 22 are opposite to the strain patterns 31, 32, and can induce the change of the strain patterns 31, 32.
The induction coils 21 and 22 are further connected with the signal processor 5, and transmit signals received by the induction coils 21 and 22 to the signal processor 5 for processing.
The peripheries of the induction coils 21 and 22 are also sleeved with magnetic conduction covers 28, and the magnetic conduction covers 28 cover the induction coils 21 and 22 and are fixed on the coil framework 23.
The Hall element 55 corresponds to the peripheral surface of the magnetic ring 6, and the magnetic ring 6 is arranged on the middle shaft 1, so that the Hall element 55 can conveniently detect the signal of the magnetic ring, and the rotating speed of the magnetic ring can be obtained through processing.
The signal processor 5 is connected to the controller by a connection 59.
As shown in fig. 4, the bobbin 23 is provided with a groove 231, and the signal processing circuit board 5 is fixed in the groove 231.
As shown in fig. 5, elastic slots 2311 are formed around the slot 231 of the bobbin, one elastic slot 2311 is formed at each short edge of the signal processing circuit board, and the elastic slot 2311 clamps the periphery of the signal processing circuit board 5 to fix the signal processing circuit board 5.
As shown in fig. 6 and 7, another fixing manner of the coil bobbin and the signal processing circuit board 5 is as follows: a hole 58 is arranged in the idle position of the signal processing circuit board 5, a boss 2312 corresponding to the hole 58 in the idle position of the signal processing circuit board is arranged on the coil framework, and the boss 2312 can be clamped into the hole 58 of the signal processing circuit board to fix the signal processing circuit board 5.
The top of the boss 2312 on the bobbin is spherical, which can be inserted into the hole 58 of the signal processing circuit board more conveniently.
As shown in fig. 8 and 9, the signal processing board of the signal processor 5 integrates components of a microprocessor chip 51, an operational amplifier circuit chip 52, a resistor 53, a capacitor 54, a hall element 55, an analog switch tube 56, and a power chip 57, wherein the microprocessor chip 51 and the operational amplifier circuit chip 52 are sequentially arranged at a middle position of the front surface of the signal processing circuit board along the axial direction of the coil skeleton, and the resistor 53 and the capacitor 54 are arranged at an edge position of the front surface of the signal processing circuit board.
As shown in fig. 9, 10 and 11, the hall element 55, the analog switch tube 56 and the power chip element 57 are disposed at the edge of the back side of the signal processing circuit board, corresponding to the outer peripheral surface of the magnetic ring 6, and the magnetic ring 6 is disposed on the middle shaft 1, so that the hall element 55 can conveniently detect the signal of the magnetic ring, and the rotational speed of the magnetic ring can be obtained through processing.
Claims (10)
1. Torque sensor of electric bicycle, it includes axis, induction coil, signal processor, strain cover, strain the cover and set up in the axis, the axis is connected with bicycle sprocket and by its drive, strain set up induction coil on the periphery and with the signal processor who is connected induction coil, induction coil installs on coil skeleton, its characterized in that: the periphery of the coil framework is provided with a groove hole for mounting a signal processing circuit board of the signal processor, and the signal processing circuit board is fixed with the groove hole in a buckling mode.
2. The torque sensor of claim 1, wherein: and elastic clamping grooves are formed in the peripheries of the coil framework groove holes and clamp the peripheries of the signal processing circuit boards.
3. The torque sensor of claim 2, wherein: the elastic clamping groove is arranged at the short side of the signal processing circuit board.
4. The torque sensor of claim 1, wherein: the coil framework is provided with a boss corresponding to the idle position of the signal processing circuit board, and the boss can be clamped into a hole of the signal processing circuit board to fix the signal processing circuit board.
5. The torque sensor of claim 4, wherein: the top of the lug boss on the coil framework is spherical.
6. The torque sensor of claim 1, wherein: the signal processing circuit board of the signal processor is integrated with a microprocessor chip, an operational amplification circuit chip, a resistor, a capacitor, a Hall, an analog switch tube and a power chip component, wherein the microprocessor chip and the operational amplification circuit chip are sequentially arranged at the middle position of the front side of the signal processing circuit board along the axial direction of a coil framework, and the Hall component, the analog switch tube and the power chip component are arranged at the edge position of the back side of the signal processing circuit board.
7. The torque transducer of claim 6, wherein: the resistor and the capacitor are arranged at the edge position of the front surface of the signal processing circuit board.
8. The torque transducer of claim 6, wherein: the analog switch tube and the power chip component are arranged at the vacant position of the signal processing circuit board.
9. The torque transducer of claim 6, wherein: the Hall element is arranged at the edge position of the reverse side of the signal processing circuit board and corresponds to the peripheral surface of the magnetic ring.
10. The torque transducer of claim 9, wherein: the magnetic ring is fixed on the middle shaft and is opposite to the magnetic ring Hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122493071.8U CN216433328U (en) | 2021-10-16 | 2021-10-16 | Torque sensor of electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122493071.8U CN216433328U (en) | 2021-10-16 | 2021-10-16 | Torque sensor of electric bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216433328U true CN216433328U (en) | 2022-05-03 |
Family
ID=81330642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122493071.8U Active CN216433328U (en) | 2021-10-16 | 2021-10-16 | Torque sensor of electric bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216433328U (en) |
-
2021
- 2021-10-16 CN CN202122493071.8U patent/CN216433328U/en active Active
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