CN106627964A - Torque sensor and detecting system for electric bicycle - Google Patents
Torque sensor and detecting system for electric bicycle Download PDFInfo
- Publication number
- CN106627964A CN106627964A CN201611047668.7A CN201611047668A CN106627964A CN 106627964 A CN106627964 A CN 106627964A CN 201611047668 A CN201611047668 A CN 201611047668A CN 106627964 A CN106627964 A CN 106627964A
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- China
- Prior art keywords
- strain
- torque sensor
- sleeve pipe
- sleeve
- detecting portion
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Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention provides a torque sensor and detecting system for an electric bicycle. The torque sensor comprises a center shaft, a strain sleeve and a transmission sleeve, wherein the strain sleeve and the transmission sleeve are arranged on the center shaft in a sleeving mode. At least two rows of strain detecting portions arranged at intervals are integrally formed on the strain sleeve in the axial direction. The torque sensor further comprises an induction coil arranged on the periphery of the strain detecting portions, and a signal processor connected with the induction coil. The detecting system comprises the torque sensor, a magnetic ring fixed on the center shaft or the strain sleeve or the transmission sleeve, and a Hall sensor used for detecting the rotating speed of the magnetic ring. The transmission sleeve can reduce the impact of external stress on the strain sleeve, reduce abnormal signal output and avoid damage to the strain sleeve. The strain detecting portions are integrally formed on the strain sleeve, so that the accuracy, stability and reliability of torque detection are improved, the preparation process difficulty of the strain sleeve is lowered, and application and popularization prospects in the industry are good.
Description
Technical field
The present invention relates to electric bicycle field, more particularly to a kind of torque sensor and detection for electric bicycle
System.
Background technology
At this stage, electric bicycle is taken more and more in axis mounting torque sensor so that in ride, energy
The output power of motor of electric bicycle is adjusted enough according to measured moment of torsion.It is disclosed in the industry to have a kind of measuring method, lead to
Fixed cover, sliding sleeve and the stage clip being equipped with axis is crossed, magnet ring is set on sliding sleeve, and magnet ring is detected by displacement transducer
Rotate and realize detection so that corresponding moment of torsion is converted to into electric signal.But above-mentioned torque-measuring apparatus complex structure, and in moment of torsion effect
Low sleeve and magnet ring actual displacement amount are less, it is more difficult to measure reliable results.
The method of the moment of torsion of another measurement axis is that the principal stress of generation or master should under moment of torsion effect by detecting axis
Become to realize torque measurement, can both adopt resistance strain gauge, it is also possible to using the torque sensing based on counter magnetostriction effect
Device.The counter magnetostriction effect refers to ferrimagnet by mechanical stress, and the magnetic conductivity of its material changes, especially magnetic
The phenomenon that conductance changes.
In recent years amorphous alloy has significant counter magnetostriction effect as a kind of new magnetoelastic material, passes through
One layer of above-mentioned amorphous alloy material is attached or sprayed on axis, when coordinating Hall element to gather axis different conditions
Torque value.This area also discloses a kind of moment sensor, by arranging permeability alloys thin slice on torque sleeve pipe, coordinates outer
The coil to detect heat treatment that cloth is put, to detect the change for obtaining moment of torsion.But above-mentioned permeability alloys thin slice is necessarily deposited
In seam, permeability alloys thin slice is in uneven torque suffered by seam crossing, and detection signal is unstable；Permeability alloys thin slice attachment process
Requirement is higher, needs that permeability alloys thin slice is strictly equably attached to torque sleeve surface, also, long-term reciprocating rotation may
Can also cause to be partially stripped, affect the stability of moment of torsion detection.
In consideration of it, being necessary to provide a kind of new torque sensor and detecting system for electric bicycle.
The content of the invention
It is an object of the invention to provide a kind of torque sensor and detecting system for electric bicycle, can be reduced
Impact of the external stress to strain sleeve pipe, reduces abnormal signal output, it is to avoid the damage of strain sleeve pipe；Moment of torsion detection is improved simultaneously
Accuracy and stability, reduce strain sleeve pipe preparation technology difficulty.
For achieving the above object, the invention provides a kind of torque sensor for electric bicycle, including in
Axle, the strain sleeve pipe for being sheathed on axis set vertically with transmission sleeve pipe, the strain sleeve pipe integrally formed with least two row gaps
The strain detecting portion put, the strain sleeve pipe is with the first fixed part for being fixed to axis and mutually fix with transmission sleeve pipe second
Fixed part, first fixed part and the second fixed part are vertically respectively positioned at the two ends in strain detecting portion, the transmission sleeve pipe
The auxiliary section that is connected with outside sprocket wheel is formed with away from one end of the second fixed part, the torque sensor is also included located at should
The induction coil for becoming the periphery of test section and the signal processor for connecting the induction coil.
As a further improvement on the present invention, the strain detecting portion include along strain sleeve pipe periphery be uniformly arranged it is oblique
Line tooth, and the loxodont bearing of trend in the adjacent strain detecting portion is inconsistent.
As a further improvement on the present invention, the loxodont is extended vertically in 45 degree, the adjacent strain inspection
The loxodont bearing of trend in survey portion is perpendicular.
As a further improvement on the present invention, the loxodont vertical cross-section is triangular in shape, trapezoidal or involute teeth
The shape and loxodont tooth depth is set to 0.3-0.8mm.
As a further improvement on the present invention, width of the width that the strain detecting portion axially extends more than induction coil
Spend, and each strain detecting portion axially extends length and is set to 5-10mm.
As a further improvement on the present invention, each strain detecting portion is equipped with a groove in both sides vertically.
As a further improvement on the present invention, the torque sensor also includes being sheathed on the positioning lining of strain sleeve pipe periphery
The axle sleeve at the positioning bushing two ends is covered and is divided into, the positioning bushing is provided with relative with strain detecting portion position
The locating slot answered, the induction coil winding is arranged in the locating slot.
As a further improvement on the present invention, the axle sleeve includes the first axle sleeve and the second axle sleeve, the first axle sleeve set
Located at the outside of axis and positioned at the strain sleeve pipe away from the side of transmission sleeve pipe, second axle sleeve is sheathed on transmission sleeve pipe
Periphery, and cause the axis and transmission sleeve pipe can respectively in the first axle sleeve and the second axle sleeve rotate.
As a further improvement on the present invention, the torque sensor also includes being arranged at the screen of the induction coil periphery
Cover cover.
As a further improvement on the present invention, first fixed part is set to ring gear；Second fixed part is arranged
For external toothing.
The present invention also provides a kind of detecting system for electric bicycle, including the torque sensor and is fixed on
Magnet ring and magnet ring relative set on the axis, strain sleeve pipe or transmission sleeve pipe is passed with the Hall for detecting the magnet ring rotating speed
Sensor.
The invention has the beneficial effects as follows：The strain sleeve pipe of torque sensor of the present invention is by transmission sleeve pipe and outside sprocket wheel phase
Connection, reduces external stress to straining the mechanical shock of sleeve pipe, reduces abnormal signal output, it is to avoid the damage of strain sleeve pipe；And
And, the strain detecting portion is shaped on strain sleeve pipe, improves accuracy, the Stability and dependability of moment of torsion detection, drop
The preparation technology difficulty of low strain dynamic sleeve pipe.Except this, the detecting system with above-mentioned torque sensor can be obtained according to real-time detection
The motor output of the torque information for arriving and velocity information control electric bicycle, improvement is ridden experience, with preferably pushing away in the industry
Extensively and application prospect.
Description of the drawings
Fig. 1 is the overall structure diagram of torque sensor of the present invention；
Fig. 2 is the decomposition texture schematic diagram of torque sensor in Fig. 1；
Fig. 3 is the structural representation of the strain sleeve pipe of torque sensor of the present invention；
Fig. 4 is the structural representation that another angle of sleeve pipe is strained in Fig. 3；
Fig. 5 is the overall assembling schematic diagram of detecting system of the present invention；
Fig. 6 is the decomposition texture schematic diagram of Fig. 6 detecting systems；
Fig. 7 is the sectional view of detecting system in Fig. 1.
Specific embodiment
Describe the present invention below with reference to embodiment shown in the drawings.But the embodiment is not intended to limit
The present invention, structure, method or the conversion functionally that one of ordinary skill in the art is made according to the embodiment is wrapped
Containing within the scope of the present invention.
Fig. 1 to Fig. 7 is referred to for a better embodiment of the invention.The torque sensor 100 that the present invention is provided is to fill
It is assigned to the Five-way tube of electric bicycle（It is not shown）Interior, the torque sensor 100 includes axis 10, is sheathed on answering for axis 10
Become sleeve pipe 20 with transmission sleeve pipe 30 and be arranged at the induction coil 40 in the outside of strain sleeve pipe 20.The induction coil 40 is equal
It is even to wind the periphery for being arranged at the strain detecting portion 21.
The two ends of the axis 10 are connected with the pedal part of the electric bicycle.The strain sleeve pipe 20 is vertically
Integrally formed with the strain detecting portion 21 that at least two row gaps are arranged, the strain sleeve pipe 20 also has and is fixed to the of axis 10
One fixed part 22 and second fixed part 23 mutually fixed with transmission sleeve pipe 30, the edge of 22 and second fixed part of the first fixed part 23
Axially respectively positioned at the two ends in strain detecting portion 21.
In the present embodiment, first fixed part 22 is set to ring gear, and the axis 10 corresponds to the ring gear
Position be formed with and be engaged fixed engaging piece 11 with the ring gear 22；Second fixed part 23 is set to external toothing,
The transmission sleeve pipe 30 is formed with to be engaged with the external toothing towards one end of the strain sleeve pipe 20 and fixed engages internal tooth
Circle.The axis 10 is also formed with stopping the stopper section 12 that strain sleeve pipe 20 slides axially that the stopper section 12 is arranged
For the annulus of radially projection, the annulus is positioned at the first engaging piece 11 away from the side for being driven sleeve pipe 30.The transmission sleeve pipe
30 are also formed with the auxiliary section 31 being connected with outside sprocket wheel away from one end of the second fixed part 23, and the auxiliary section 31 is set to
Adapt to the engagement external toothing of outside sprocket wheel.
The strain detecting portion 21 is set to two rows and each strain detecting portion 21 to be included along the periphery of strain sleeve pipe 20
The loxodont 211 being uniformly arranged, the bearing of trend of the loxodont 211 in the adjacent strain detecting portion 21 is inconsistent.Should to improve
Become magnetic conductivity changing sensitivity of the surface of sleeve pipe 20 under moment of torsion effect, and then realize optimum detection result, the loxodont 211
It is extended in 45 degree vertically on the surface of strain sleeve pipe 20, the extension of the loxodont 211 in the adjacent strain detecting portion 21
Direction is perpendicular.Vertically both sides are additionally provided with a groove 24 in each strain detecting portion 21.
Preferably, each strain detecting portion 21 axially extends length L and is set to 5-10mm, and the strain inspection
Width of the width that survey portion 21 axially extends more than the induction coil 40 corresponding to it.According to the strain of the strain sleeve pipe 20
The external diameter of test section 21 determines that processing modulus m is 0.3, and then show that the tooth pitch of the loxodont 211 is 0.942mm.Wherein, institute
The vertical cross-section for stating loxodont 211 is triangular in shape, trapezoidal or tooth depth of involute profile and the loxodont 211 is set to
0.3-0.8mm。
The torque sensor 100 also includes being sheathed on the positioning bushing 50 of strain sleeve pipe 20 periphery and is divided into described
First sheath 61 and the second sheath 62 at positioning bushing 50 two ends.The fixing assembling of first sheath, 61 and second sheath 62 is to electricity
In the Five-way tube of dynamic bicycle.The torque sensor 100 also includes being located at respectively in the first sheath 61 and the second sheath 62
First axle sleeve 71 and the second axle sleeve 72, first axle sleeve 71 is sheathed on the outside of axis 10 and carries on the back positioned at the strain sleeve pipe 20
From the side of transmission sleeve pipe 30, second axle sleeve 72 is sheathed on the periphery of transmission sleeve pipe 30, and causes the axis 10 and pass
Dynamic sleeve pipe 30 can rotate respectively in the first axle sleeve 71 and the second axle sleeve 72.Thereby, under outside moment loading, the axis 10,
Strain sleeve pipe 20 and transmission sleeve pipe 30 synchronize rotation in the positioning sheath 61 of bushing 50 and first and the second sheath 62.
The positioning bushing 50 is provided with two annular positioning grooves 51 corresponding with the position of strain detecting portion 21.Institute
Stating induction coil 40 includes winding respectively the first induction coil 41 and the second induction coil being arranged in two locating slots
42.There is first induction coil 41 the magnetic field information converting for being detected to be sent to the first holding wire of signal processor
411；There is second induction coil 42 the magnetic field information converting for being detected to be sent to signal processor and secondary signal
Line 421.In the present embodiment, the signal processor is set to be fixed on the circuit board 43 of the positioning inwall of bushing 50.
The torque sensor 100 also includes being arranged at the radome 80 of the periphery of the induction coil 40, the radome
80 pairs of induction coils 40 play magnetic screening action, it is possible to increase the diamagnetic interference performance of the induction coil 40.
Present invention simultaneously provides a kind of detecting system 200 for electric bicycle, including torque sensor 100 and solid
Due to the axis 10, the magnet ring 90 for straining sleeve pipe 20 or being driven on sleeve pipe 30 and the relative set of magnet ring 90 to detect the magnetic
The Hall element of the rotating speed of ring 90（It is not shown）.In the present embodiment, the magnet ring 90 is directly anchored on the axis 10 simultaneously
With the rotation of axis 10 while rotation；The Hall element is fixedly installed on the circuit board 43.The detecting system
200 also include the velocity information that the torque information the detection of torque sensor 100 to be obtained and Hall element detection are obtained
Outwards harness-integrated the 201 of transmission, are further opened with for the harness-integrated through hole 52 walked on the positioning bushing 50, described
Harness-integrated 201 end is additionally provided with the connector 202 to dock with external interface.
In practical application process, bicyclist is rotated by pedaling to spoil part and order about axis 10, and axis 10 orders about strain sleeve pipe 20
And transmission sleeve pipe 30 rotates simultaneously, torque is passed to outside sprocket wheel, and driving electric by transmission sleeve pipe 30 by auxiliary section 31 again
The chain rotation of bicycle.During this, there is circumferential deformation in the strain sleeve pipe 20, and then cause described by circumferential torsion
Magnetic field around induction coil 40 changes, and is transmitted corresponding signal by the first holding wire 411 and secondary signal line 421
To circuit board 43.Meanwhile, the Hall element being fixed on circuit board 43 can also real-time detection obtain the rotating speed of axis 10, and lead to
Cross harness-integrated 201 outwards to transmit torque information and velocity information to carry out integrated treatment, and then control electric bicycle
Power of motor is exported, and to improve ride experience, and save energy, extends motor course continuation mileage.
In sum, the strain sleeve pipe 20 of torque sensor of the present invention 100 is connected by being driven sleeve pipe 30 with outside sprocket wheel, is dropped
Mechanical shock of the low external stress to strain sleeve pipe 20, reduces abnormal signal output, it is to avoid the damage of strain sleeve pipe 20.
The strain detecting portion 21 is shaped on strain sleeve pipe 20, reduces the preparation technology difficulty of strain sleeve pipe 20,
And improve moment of torsion detection accuracy, Stability and dependability.
Except this, the torque information and velocity information control that the detecting system 200 can be obtained according to real-time detection is electronic
The motor output of bicycle, improvement is ridden experience, with preferably popularization and application prospect in the industry.
It should be understood that, although this specification is been described by according to embodiment, but not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that for clarity those skilled in the art will should say
Bright book as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, forming those skilled in the art can
With the other embodiment for understanding.
The a series of detailed description of those listed above is only for the feasibility embodiment of the present invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included within the scope of the present invention.
Claims (11)
1. a kind of torque sensor for electric bicycle, it is characterised in that：The torque sensor includes axis, is sheathed on
The strain sleeve pipe of axis and transmission sleeve pipe, the strain inspection that the strain sleeve pipe is arranged vertically integrally formed with least two row gaps
Survey portion, the strain sleeve pipe has the first fixed part and second fixed part mutually fixed with transmission sleeve pipe for being fixed to axis, institute
The first fixed part and the second fixed part are stated vertically respectively positioned at the two ends in strain detecting portion, the transmission sleeve pipe is solid away from second
The one end for determining portion is formed with the auxiliary section being connected with outside sprocket wheel, and the torque sensor is also included located at strain detecting portion
The induction coil of periphery and the signal processor of the connection induction coil.
2. torque sensor according to claim 1, it is characterised in that：The strain detecting portion is included along strain sleeve pipe
The loxodont that periphery is uniformly arranged, and the loxodont bearing of trend in the adjacent strain detecting portion is inconsistent.
3. torque sensor according to claim 2, it is characterised in that：The loxodont sets vertically in 45 degree of extensions
Put, the loxodont bearing of trend in the adjacent strain detecting portion is perpendicular.
4. torque sensor according to claim 2, it is characterised in that：The loxodont vertical cross-section is in triangle
Shape, trapezoidal or involute profile and the loxodont tooth depth is set to 0.3-0.8mm.
5. torque sensor according to claim 1, it is characterised in that：The width that the strain detecting portion axially extends
Axially extend length and be set to 5-10mm more than the width of induction coil, and each strain detecting portion.
6. torque sensor according to claim 1, it is characterised in that：Vertically both sides are equal in each strain detecting portion
It is provided with a groove.
7. torque sensor according to claim 1, it is characterised in that：The torque sensor also includes being sheathed on strain
The positioning bushing of sleeve pipe periphery and be divided into the axle sleeve at the positioning bushing two ends, the positioning bushing be provided with it is described should
Become the corresponding locating slot in test section position, the induction coil winding is arranged in the locating slot.
8. torque sensor according to claim 7, it is characterised in that：The axle sleeve includes the first axle sleeve and the second axle
Set, first axle sleeve be sheathed on the outside of axis and positioned at it is described strain sleeve pipe away from transmission sleeve pipe side, described second
Axle sleeve is sheathed on the periphery of transmission sleeve pipe, and so that the axis and transmission sleeve pipe can respectively in the first axle sleeve and the second axle sleeve
Rotation.
9. torque sensor according to claim 1, it is characterised in that：The torque sensor is also described including being arranged at
The radome of induction coil periphery.
10. torque sensor according to claim 1, it is characterised in that：First fixed part is set to ring gear；Institute
State the second fixed part and be set to external toothing.
A kind of 11. detecting systems for electric bicycle, including the torque sensor as described in any one of claim 1-10,
It is characterized in that：The detecting system also includes magnet ring and and the magnetic being fixed on the axis, strain sleeve pipe or transmission sleeve pipe
Ring relative set is detecting the Hall element of the magnet ring rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047668.7A CN106627964A (en) | 2016-11-22 | 2016-11-22 | Torque sensor and detecting system for electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047668.7A CN106627964A (en) | 2016-11-22 | 2016-11-22 | Torque sensor and detecting system for electric bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106627964A true CN106627964A (en) | 2017-05-10 |
Family
ID=58812151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611047668.7A Withdrawn CN106627964A (en) | 2016-11-22 | 2016-11-22 | Torque sensor and detecting system for electric bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106627964A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806949A (en) * | 2017-12-08 | 2018-03-16 | 广州市快易达工贸有限公司 | A kind of dynamic pickup structure |
| CN108839751A (en) * | 2018-05-23 | 2018-11-20 | 东莞市京橙电机科技有限公司 | Coaxial central driving motor system and vehicle using motor |
| CN109178186A (en) * | 2018-11-06 | 2019-01-11 | 深圳市奥酷曼智能技术有限公司 | Converse magnetostriction axis torque sensor |
| CN109421882A (en) * | 2017-08-31 | 2019-03-05 | 北京轻客智能科技有限责任公司 | Torsion acquires assembly, built-in motor and bicycle |
| CN110662657A (en) * | 2017-08-29 | 2020-01-07 | 英诺托克有限公司 | Hub transmission unit for a vehicle hub, hub and auxiliary-driven vehicle |
| CN111071382A (en) * | 2020-01-13 | 2020-04-28 | 常州拓科智能科技有限公司 | Dynamic and static combined torque sensor of electric power-assisted bicycle |
| WO2020224202A1 (en) * | 2019-05-05 | 2020-11-12 | 昆山攀登电子科技有限公司 | Dynamic torque sensing device of thread-on freewheel structure |
| WO2021063019A1 (en) * | 2019-09-30 | 2021-04-08 | 昆山朗德森机电科技有限公司 | Torque sensor for power-assisted bicycle, and power-assisted bicycle |
| TWI737418B (en) * | 2020-07-21 | 2021-08-21 | 介隆興齒輪股份有限公司 | Independent enclosed torque sensor |
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| CN103171733A (en) * | 2013-04-09 | 2013-06-26 | 苏州八方电机科技有限公司 | Central-shaft torque sensing device for electric bicycle |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110662657A (en) * | 2017-08-29 | 2020-01-07 | 英诺托克有限公司 | Hub transmission unit for a vehicle hub, hub and auxiliary-driven vehicle |
| CN110662657B (en) * | 2017-08-29 | 2023-12-05 | 保时捷电动自行车有限责任公司 | Hub transmission unit for a vehicle hub, hub and auxiliary drive vehicle |
| CN109421882A (en) * | 2017-08-31 | 2019-03-05 | 北京轻客智能科技有限责任公司 | Torsion acquires assembly, built-in motor and bicycle |
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| CN108839751A (en) * | 2018-05-23 | 2018-11-20 | 东莞市京橙电机科技有限公司 | Coaxial central driving motor system and vehicle using motor |
| CN108839751B (en) * | 2018-05-23 | 2024-03-22 | 铂金橙智能科技(太仓)有限公司 | Coaxial centrally-mounted driving motor system and moped |
| CN109178186A (en) * | 2018-11-06 | 2019-01-11 | 深圳市奥酷曼智能技术有限公司 | Converse magnetostriction axis torque sensor |
| CN109178186B (en) * | 2018-11-06 | 2024-02-09 | 深圳市奥酷曼智能技术有限公司 | Reverse magnetostriction center shaft moment sensor |
| WO2020224202A1 (en) * | 2019-05-05 | 2020-11-12 | 昆山攀登电子科技有限公司 | Dynamic torque sensing device of thread-on freewheel structure |
| US12111221B2 (en) | 2019-05-05 | 2024-10-08 | Kclamber Electric Technology Corp | Dynamic torque sensing device of thread-on freewheel structure |
| WO2021063019A1 (en) * | 2019-09-30 | 2021-04-08 | 昆山朗德森机电科技有限公司 | Torque sensor for power-assisted bicycle, and power-assisted bicycle |
| CN111071382A (en) * | 2020-01-13 | 2020-04-28 | 常州拓科智能科技有限公司 | Dynamic and static combined torque sensor of electric power-assisted bicycle |
| TWI737418B (en) * | 2020-07-21 | 2021-08-21 | 介隆興齒輪股份有限公司 | Independent enclosed torque sensor |
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Application publication date: 20170510 |