Driving wheel mechanism pedaling force sensing device

Abstract

The invention discloses a driving wheel mechanism treading force sensing device which comprises a driving wheel mechanism installed on a motor shaft on the outer side of an end cover of a hub motor and a torque sensing assembly arranged in the driving wheel mechanism, the driving wheel mechanism comprises a driving wheel installation sleeve, and at least one driving wheel is fixed to the outer portion of the driving wheel installation sleeve. The transmission wheel is used for being connected and fixed to an output wheel on a center shaft of the electric bicycle through a flexible traction piece, and pedals are fixed to the two ends of the center shaft through cranks. The torque sensing device is characterized in that the torque sensing assembly comprises a deformation shaft sleeve arranged on the motor shaft, a strain gauge is attached to the deformation shaft sleeve, and the inner circumference of the transmission wheel installation sleeve makes contact with the outer circumference of the deformation shaft sleeve through a plurality of bearings so that the radial component force, transmitted to the transmission wheel installation sleeve, of the middle shaft treading force can be transmitted to the deformation shaft sleeve. The pedal force sensing device of the driving wheel mechanism is higher in torque signal acquisition precision, simple in structure and easy to assemble.

Description

Technical Field

[0001] The invention relates to a pedal force sensor device of a transmission wheel mechanism. Background Art

[0002] In consideration of component integration design, existing electric bicycles usually install the torque sensor assembly used to detect the pedaling force of the rider on the transmission wheel mechanism outside the hub motor to form a transmission wheel mechanism pedaling force sensing device. The common transmission wheel mechanism pedaling force sensing devices on the market mainly set the strain element in the torque sensor assembly on the relatively rotating transmission wheel mounting sleeve, and the transmission wheel mounting sleeve is also fixed with a transmission wheel (conventionally a single or multi-stage sprocket is used). When a person rides, the pedal force drives the middle axis crank and the output wheel (crankshaft) to drive the chain to move, and then pulls the transmission wheel to rotate and transmit torque, so that the transmission wheel mounting sleeve is subjected to force and produces micro-deformation, and the strain element senses the micro-deformation of the transmission wheel mounting sleeve, and converts it through the signal processing circuit in the torque sensor assembly to obtain a torque detection signal.

[0003] However, after practical application, we found that the above-mentioned transmission wheel mechanism pedal force sensor device exposed the following problems: 1. The torque sensor assembly cannot form a modular component with the transmission wheel mechanism that is easy to simplify assembly. This is because, on the one hand, the existing torque sensor assembly is usually installed on the transmission wheel mounting sleeve or the motor shaft outside it. Not only are there many parts and disassembly and assembly are cumbersome, but the sealing of the circuit components is also difficult to ensure.

[0004] On the other hand, since the strain element in the torque sensor assembly is fixed on the rotating transmission wheel mounting sleeve, its signal output cannot be directly led out using a direct signal line, but can only be led out using the wireless induction method of the inner and outer coils. However, in this method, the inner and outer coils must be installed deep inside the transmission wheel mounting sleeve, and in order to avoid the outer bearing, the installation position is close to the inside (at the connection end between the transmission wheel mechanism and the hub motor). In addition, a corresponding bracket is required to fix the PCB board of the coil. The structure is complex, with many parts, and assembly, maintenance and disassembly are very cumbersome and inconvenient, resulting in low production efficiency and high maintenance costs.

[0005] Since the wireless induction method of the above-mentioned internal and external coils has transmission loss itself, and the signal is susceptible to interference, the output strength and accuracy of the signal are far inferior to the output method of direct connection of the signal line, which leads to a decrease in the accuracy and reliability of the final torque detection data.

[0006] The force detected and obtained from the transmission wheel mounting sleeve is relatively complex, including the radial tension applied by the chain to the transmission wheel and then acting on the transmission wheel mounting sleeve, as well as the torque generated by the transmission wheel driving the transmission wheel mounting sleeve to rotate. It may also include the feedback force of the hub shell acting on the transmission wheel mounting sleeve through the ratchet pawl one-way clutch, etc. This makes it difficult to accurately and effectively identify the force actually transmitted by the pedaling force, resulting in the detection accuracy of the torque sensor component being affected.

[0007] The current response in the industry is usually to use complex signal processing circuits to identify and distinguish forces, but this type of signal processing circuit is expensive and the actual effect is not ideal. Summary of the invention

[0008] The purpose of the present invention is to provide a driving wheel mechanism pedal force sensor device in view of the deficiencies of the prior art mentioned in the background technology, which not only has a simple overall structure and is easy to assemble, but also has a higher torque signal acquisition accuracy.

[0009] The technical solution of the present invention is: a transmission wheel mechanism pedal force sensing device, including a transmission wheel mechanism installed on the motor shaft outside the end cover of the hub motor and a torque sensing component arranged therein, the transmission wheel mechanism includes a transmission wheel mounting sleeve, at least one transmission wheel is fixed to the outside of the transmission wheel mounting sleeve, the transmission wheel is used to connect and fix to the output wheel on the middle shaft of the electric bicycle through a flexible traction member, and the two ends of the middle shaft are fixed to the pedals through cranks; it is characterized in that: the torque sensing component includes a set of deformable sleeves arranged on the motor shaft, strain gauges are attached to the deformable sleeves, and the inner periphery of the transmission wheel mounting sleeve is in contact with the outer periphery of the deformable sleeve via a plurality of bearings, so as to transmit the radial component of the pedal force of the middle shaft transmitted to the transmission wheel mounting sleeve to the deformable sleeve.

[0010] Furthermore, the torque sensing assembly in the present invention also includes a signal processing PCB board fixed to the deformable sleeve and electrically connected to the strain gauge, and the lead wires of the signal processing PCB board are led out to the outside of the transmission wheel mechanism through the slots opened in the deformable sleeve.

[0011] Furthermore, the inner periphery of the transmission wheel mounting sleeve contacts the outer periphery of the deformable sleeve via two bearings spaced front and rear, wherein the bearing close to the hub motor is the front bearing, and the other is the rear bearing, and a spacer sleeve is sandwiched between the two bearings.

[0012] Preferably, in order to further enhance the packaging integrity of the torque sensor assembly and the transmission wheel mechanism in this case and facilitate their overall modular disassembly and assembly, we make the following improvements: One is to also arrange the signal processing PCB board between the two bearings, thereby effectively ensuring the sealing of electrical components.

[0013] The second is to arrange the strain gauge between the two bearings, also for more effectively ensuring the sealing of the electrical components.

[0014] The axial fixing structure for the two bearings on the inner side of the transmission wheel mounting sleeve in the present invention is further as follows: a limiting convex step is provided at the front position of the inner circumference of the transmission wheel mounting sleeve, the front end of the front bearing abuts against the limiting convex step, and the rear end abuts against the front end of the spacer sleeve for axial positioning; and the front end of the rear bearing abuts against the rear end of the spacer sleeve, and the rear end abuts against a bearing positioning ring embedded in the inner circumference groove of the transmission wheel mounting sleeve for axial positioning.

[0015] On the basis of the above-mentioned double-bearing structural design, the axial fixing structure of the deformable sleeve in this case is further as follows: the front end of the rear bearing is abutted against a limiting protrusion provided on the deformable sleeve, and at the same time, the rear end of the rear bearing is abutted against a set of top tightening sleeves provided on the deformable sleeve, and the rear end of the top tightening sleeve is abutted against a sleeve positioning clamp ring embedded in the outer peripheral groove of the deformable sleeve, so as to axially fix the deformable sleeve.

[0016] Furthermore, the rear end of the deformable sleeve in the present invention is axially limited by a nut threadedly connected to the motor shaft, and a cover plate is fixed to the end of the transmission wheel mounting sleeve, the cover plate is provided with a clearance hole for the motor shaft and the nut to move in and out, and the cover plate is provided with an opening for leading out the lead wire.

[0017] Further, like conventional technology, the transmission wheel mounting sleeve in the present invention is connected to the end cover of the hub motor via a ratchet pawl one-way clutch, and a ratchet is fixed on the transmission wheel mounting sleeve, which is connected and cooperated with a ratchet provided on the end cover of the hub motor to form the ratchet pawl one-way clutch; or a pawl is fixed on the transmission wheel mounting sleeve, which is connected and cooperated with a ratchet provided on the end cover of the hub motor to form the ratchet pawl one-way clutch.

[0018] Furthermore, in the present invention, the transmission wheel is a sprocket wheel, the output wheel is a toothed disc, and the corresponding flexible traction member is a chain; or the transmission wheel and the output wheel are both pulleys, and the corresponding flexible traction member is a belt. And as in the conventional method, the transmission wheel can be provided in a single configuration or in multiple configurations for multi-stage speed change considerations.

[0019] The working principle of the present invention is as follows: During riding, the pedal force applied by the person on the pedals at both ends of the middle shaft is transmitted to the transmission wheel and the transmission wheel mounting sleeve fixed thereto through the output wheel and the flexible traction member. The transmission wheel mounting sleeve then applies the radial component (tension) of the pedal force of the middle shaft to the deformed sleeve through the inner bearing, causing the deformed sleeve to deform slightly. The strain gauge senses the slight deformation and generates an induction signal, which is processed by the signal processing PCB board and outputs a torque signal to the controller of the electric bicycle to control the speed of the output of the hub motor of the electric bicycle. Depending on the pedal force of the person, the deformation amount of the deformed sleeve sensed by the strain gauge will also change, and the size of the output torque signal will also change, thereby achieving the function of accurately detecting the pedal force.

[0020] The advantages of the present invention are: The present invention not only has a simple overall structure and is easy to assemble, but also has higher torque signal acquisition accuracy. The specific advantages are as follows: 1. In the structural design of the present invention, the radial force transmission connection between the deformable sleeve in the torque sensor assembly and the transmission wheel mounting sleeve is completed through the bearing, so that after the pedal force is transmitted to the transmission wheel and the transmission wheel mounting sleeve via the output wheel and the flexible traction member, a precise radial tension can be directly applied to the deformable sleeve to force it to deform and be sensed by the strain gauge, thereby eliminating the interference factors of other external forces, enhancing the recognition accuracy of the pedal force, and greatly improving the final detection data accuracy of the entire pedal force sensor device. It also saves the production cost of the signal processing circuit that uses complex calculations in the prior art.

[0021] In the structural design of the present invention, the torque sensing assembly is entirely fixed on a non-rotating deformable sleeve in the transmission wheel mechanism, and the signal of the strain gauge can be directly connected to the signal processing PCB board by wires without the need to use the wireless induction method of the internal and external coils to lead out. Therefore, there is no transmission loss and signal susceptibility to interference problems existing in the wireless induction method of the internal and external coils, so that the output strength and accuracy of the signal are qualitatively improved, thereby ensuring the accuracy and reliability of the final torque detection data.

[0022] In the structural design of the present invention, since the strain gauge signal data extraction method of the wireless induction of the internal and external coils is cancelled, it not only saves the components including the internal and external coils, the corresponding brackets, etc., but also greatly saves the volume space inside the transmission wheel mounting sleeve, so that the radial size of the pedal force sensor device of the entire transmission wheel mechanism is reduced, the structure is simpler and more compact, and the assembly, maintenance and disassembly are extremely convenient, which effectively improves the production efficiency while reducing the maintenance cost.

[0023] The present invention integrates the transmission wheel mechanism and the torque sensor assembly into a standard component, which is convenient for modular production and can be assembled and disassembled from the motor shaft as a whole, which can simplify the enterprise's production and manufacturing process and save production costs. At the same time, the pedal force sensor device that integrates the transmission wheel mechanism and the torque sensor assembly in this case has a strong overall packaging performance, which can ensure the sealing and reliability of internal circuit components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is the main sectional view along the axial direction of the present invention; Figure 2 It is a radial front view of the present invention in a state of being connected to the middle axle chainring through a chain drive; Figure 3 It is a separate radial front view of the present invention; Figure 4 Schematic diagram of the arrangement position of the strain gauge in the second embodiment of the present invention; Figure 5 Schematic diagram of the arrangement position of strain gauges in the third embodiment of the present invention.

[0025] Among them: 1. hub motor; 101. end cover; 2. motor shaft; 3. drive wheel mounting sleeve; 301. limit cam; 4. drive wheel; 5. flexible traction member; 6. middle shaft; 7. chainring; 8. pedal; 9. deformable sleeve; 901. slot; 902. limit cam; 10. strain gauge; 11. bearing; 12. signal processing PCB board; 13. spacer; 14. bearing positioning ring; 15. tightening sleeve; 16. sleeve positioning ring; 17. nut; 18. cover plate; 19. crank. DETAILED DESCRIPTION

[0026] Example: The following combination Figure 1~Figure 3 The specific implementation of the driving wheel mechanism pedal force sensor device provided by the present invention is described as follows: First, like the known technology, it has a hub motor 1, a transmission wheel mechanism mounted on the motor shaft 2 outside the end cover 101 of the hub motor 1, and a torque sensor component arranged in the transmission wheel mechanism. Both ends of the motor shaft 2 are fixed to the frame of the electric bicycle (omitted in the figure). The transmission wheel mechanism includes a transmission wheel mounting sleeve 3, and a plurality of transmission wheels 4 for speed change are fixed outside the transmission wheel mounting sleeve 3. The transmission wheels 4 are all used to connect and fix to the output wheels on the middle shaft 6 of the electric bicycle through the flexible traction member 5, and the two ends of the middle shaft 6 are fixed to the pedals 8 through the crank 19. In this embodiment, the transmission wheels 4 are all sprockets, the output wheels are the toothed disc 7, and the corresponding flexible traction member 5 is a chain.

[0027] Still the same as the known technology, the front end of the transmission wheel mounting sleeve 3 is connected to the end cover 101 of the hub motor 1 via a ratchet pawl one-way clutch (omitted in the figure). Specifically, a ratchet is fixed on the transmission wheel mounting sleeve 3, which is connected and cooperated with the ratchet pawl arranged on the end cover of the hub motor to form the ratchet pawl one-way clutch.

[0028] The core improvement of the present invention is that the torque sensing assembly has a set of deformable sleeves 9 arranged on the motor shaft 2, and a strain gauge 10 is attached to the deformable sleeve 9. The inner periphery of the transmission wheel mounting sleeve 3 contacts the outer periphery of the deformable sleeve 9 via two bearings 11 spaced apart front and rear, so as to transmit the radial component of the pedaling force of the middle shaft 6 on the transmission wheel mounting sleeve 3 to the deformable sleeve 9.

[0029] Still like Figure 1 As shown, the torque sensing assembly in this embodiment also includes a signal processing PCB board 12 fixed to the deformable sleeve 9 and electrically connected to the strain gauge 10, and the lead wires (omitted in the figure) of the signal processing PCB board 12 are led out to the outside of the transmission wheel mechanism through the slot 901 opened in the deformable sleeve 9.

[0030] Recombination Figure 1 As shown, in this embodiment, the bearing 11 close to the hub motor 1 is the front bearing 11 (located on the left side in the figure), and the other is the rear bearing 11 (located on the right side in the figure), and a spacer sleeve 13 is sandwiched between the two bearings 11.

[0031] In order to enhance the packaging integrity of the torque sensor assembly and the transmission wheel mechanism in this case and facilitate their overall modular disassembly and assembly, the signal processing PCB board 12 in this embodiment is located between the two bearings 11, and the strain gauge 10 is also located between the two bearings 11, which effectively ensures the sealing of electrical components.

[0032] In this embodiment, a limiting step 301 is provided at the front position of the inner circumference of the transmission wheel mounting sleeve 3, and the front end of the front bearing 11 abuts against the limiting step 301, and the rear end abuts against the front end of the spacer sleeve 13 for axial positioning; and the front end of the rear bearing 11 abuts against the rear end of the spacer sleeve 13, and the rear end abuts against a bearing positioning ring 14 embedded in the inner circumference groove of the transmission wheel mounting sleeve 3 for axial positioning.

[0033] In this embodiment, the front end of the rear bearing 11 abuts against a limiting protrusion 902 provided on the deformable sleeve 9, and the rear end of the rear bearing 11 abuts against a set of top sleeves 15 provided on the deformable sleeve 9. The rear end of the top sleeve 15 abuts against a sleeve positioning ring 16 embedded in the outer peripheral groove of the deformable sleeve 9, so as to axially fix the deformable sleeve 9.

[0034] In this embodiment, the rear end of the deformable sleeve 9 is axially limited by a nut 17 that is threadedly connected to the motor shaft 2. At the same time, a cover plate 18 is fixed to the end of the transmission wheel mounting sleeve 3. The cover plate 18 is provided with a clearance hole for the motor shaft 2 and the nut 17 to move in and out. At the same time, the cover plate 18 is provided with an opening (not marked) for leading out the lead wire.

[0035] Combination Figure 1~Figure 3 As shown, the working principle of the above embodiment is as follows: During riding, the pedal force applied by the person to the pedals 8 at both ends of the middle shaft 6 is transmitted to the transmission wheel 4 (sprocket) and the transmission wheel mounting sleeve 3 fixed thereto through the toothed disc 7 and the flexible traction member 5 (chain). The transmission wheel mounting sleeve 3 then applies the radial component (tension) of the pedal force of the middle shaft 6 to the deformable sleeve 9 through the inner bearing 11, causing the deformable sleeve 9 to deform slightly, and the strain gauge 10 senses the slight deformation and generates an induction signal, which is processed by the signal processing PCB board 12 and outputs a torque signal to the controller of the electric bicycle (not shown in the figure), thereby controlling the speed of the output of the hub motor 1 of the electric bicycle. According to the different pedaling forces of the person, the deformation amount of the deformable sleeve 9 sensed by the strain gauge 10 will also change, and the magnitude of the output torque signal will also change, thereby achieving the function of accurately detecting the pedaling force.

[0036] Embodiment 2: The difference between this embodiment and embodiment 1 is that the strain gauge 10 is arranged on the deformation sleeve 9 outside the two bearings 11, specifically in front of the front bearing 11, such as Figure 4 As shown, of course, the rest of the structure of this embodiment is the same as that of embodiment 1.

[0037] Embodiment 3: The difference between this embodiment and embodiment 1 is that the strain gauge 10 is arranged on the deformation sleeve 9 outside the two bearings 11, specifically behind the rear bearing 11, such as Figure 5 As shown, of course, the rest of the structure of this embodiment is the same as that of embodiment 1.

[0038] In the above structural design of the present invention, the radial force transmission connection is completed between the deformable sleeve 9 in the torque sensor assembly and the transmission wheel mounting sleeve 3 through the bearing 11, so that after the pedal force is transmitted to the transmission wheel 4 and the transmission wheel mounting sleeve 3 through the chainring 7 and the flexible traction member 5, a precise radial tension can be directly applied to the deformable sleeve 9 to force it to deform and be sensed and acquired by the strain gauge 10, thereby eliminating the interference factors of other external forces, enhancing the recognition accuracy of the pedal force, and greatly improving the final detection data accuracy of the entire pedal force sensor device. It also saves the production cost of the signal processing circuit that uses complex calculations in the prior art.

[0039] In the above structural design, the torque sensing assembly is fixed on the non-rotating deformable sleeve 9 in the transmission wheel mechanism as a whole, and the signal of the strain gauge 10 can be directly connected to the signal processing PCB board 12 by wires without the need to use the wireless induction method of the internal and external coils to lead out. Therefore, there is no transmission loss and signal susceptibility to interference problems existing in the wireless induction method of the internal and external coils, so that the output strength and accuracy of the signal are qualitatively improved, thereby ensuring the accuracy and reliability of the final torque detection data.

[0040] In addition, in the above-mentioned structural design, since the signal data extraction method of the strain gauge 10 for wireless induction of the internal and external coils is cancelled, not only the components including the internal and external coils, the corresponding brackets, etc. are saved, but also the volume space inside the transmission wheel mounting sleeve 3 is greatly saved, so that the radial size of the pedal force sensor device of the entire transmission wheel mechanism is reduced, the structure is simpler and more compact, and the assembly, maintenance and disassembly are extremely convenient, which effectively improves the production efficiency while reducing the maintenance cost.

[0041] What is particularly important is that the present invention integrates the transmission wheel mechanism and the torque sensor assembly into a standard component, which is convenient for modular production and can be assembled and disassembled from the motor shaft 2 as a whole, which can simplify the company's production and manufacturing procedures and save production costs. At the same time, the pedal force sensor device in this case that integrates the transmission wheel mechanism and the torque sensor assembly has a strong overall packaging performance, which can ensure the sealing and reliability of internal circuit components.

[0042] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any modifications made according to the spirit of the main technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A driving wheel mechanism pedal force sensing device, comprising a driving wheel mechanism mounted on a motor shaft (2) outside an end cover (101) of a hub motor (1) and a torque sensing assembly arranged therein, the driving wheel mechanism comprising a driving wheel mounting sleeve (3), at least one driving wheel (4) being fixed outside the driving wheel mounting sleeve (3), the driving wheel (4) being used to be connected to an output wheel on a central shaft (6) of an electric bicycle via a flexible traction member (5), and pedals (8) being fixed at both ends of the central shaft (6) via cranks (19); characterized in that: The torque sensor assembly comprises a set of deformable sleeves (9) arranged on the motor shaft (2), a strain gauge (10) being attached to the deformable sleeves (9), and the inner periphery of the transmission wheel mounting sleeve (3) is in contact with the outer periphery of the deformable sleeves (9) via a plurality of bearings (11) so as to transmit the radial component of the pedal force of the middle shaft (6) transmitted to the transmission wheel mounting sleeve (3) to the deformable sleeves (9).

2. The driving wheel mechanism pedal force sensor device according to claim 1, characterized in that: The torque sensor assembly further comprises a signal processing PCB board (12) fixed to the deformable shaft sleeve (9) and electrically connected to the strain gauge (10), wherein a lead wire of the signal processing PCB board (12) is led out to the outside of the transmission wheel mechanism via a slot (901) provided in the deformable shaft sleeve (9).

3. The driving wheel mechanism pedal force sensor device according to claim 2, characterized in that The inner periphery of the transmission wheel mounting sleeve (3) contacts the outer periphery of the deformable shaft sleeve (9) via two bearings (11) spaced apart at the front and rear ends, wherein the bearing (11) close to the wheel hub motor (1) is a front bearing (11), and the other is a rear bearing (11), and a spacer sleeve (13) is sandwiched between the two bearings (11).

4. The driving wheel mechanism pedal force sensor device according to claim 3, characterized in that The signal processing PCB board (12) is located between the two bearings (11).

5. The driving wheel mechanism pedal force sensor device according to claim 3, characterized in that The strain gauge (10) is located between the two bearings (11).

6. The driving wheel mechanism pedal force sensor device according to claim 3, characterized in that A limiting convex step (301) is provided at a front position of the inner circumference of the transmission wheel mounting sleeve (3); the front end of the front bearing (11) abuts against the limiting convex step (301), and the rear end abuts against the front end of the spacer sleeve (13) for axial positioning; and the front end of the rear bearing (11) abuts against the rear end of the spacer sleeve (13), and the rear end abuts against a bearing positioning clamping ring (14) embedded in a clamping groove on the inner circumference of the transmission wheel mounting sleeve (3) for axial positioning.

7. The driving wheel mechanism pedal force sensor device according to claim 6, characterized in that The front end of the rear bearing (11) abuts against a limiting protrusion (902) provided on the deformable shaft sleeve (9), and the rear end of the rear bearing (11) abuts against a set of top tightening sleeves (15) provided on the deformable shaft sleeve (9), and the rear end of the top tightening sleeve (15) abuts against a shaft sleeve positioning clamping ring (16) embedded in the outer peripheral clamping groove of the deformable shaft sleeve (9), thereby axially fixing the deformable shaft sleeve (9).

8. The driving wheel mechanism pedal force sensor device according to claim 7, characterized in that The rear end of the deformable sleeve (9) is axially limited by a nut (17) connected to the motor shaft (2) through a thread, and a cover plate (18) is fixed to the end of the drive wheel mounting sleeve (3). The cover plate (18) is provided with a clearance hole for allowing the motor shaft (2) and the nut (17) to move in and out, and the cover plate (18) is provided with an opening for leading out a lead wire.

9. The driving wheel mechanism pedal force sensor device according to claim 1, characterized in that: The transmission wheel mounting sleeve (3) is connected to the end cover (101) of the hub motor (1) via a ratchet pawl one-way clutch; a ratchet is fixed on the transmission wheel mounting sleeve (3), which is connected and matched with a ratchet provided on the end cover (10) of the hub motor (1) to form the ratchet pawl one-way clutch; or a ratchet is fixed on the transmission wheel mounting sleeve (3), which is connected and matched with a ratchet provided on the end cover (10) of the hub motor (1) to form the ratchet pawl one-way clutch.

10. The driving wheel mechanism pedal force sensor device according to claim 1, characterized in that: The transmission wheel (4) is a sprocket wheel, the output wheel is a toothed disc (7), and the corresponding flexible traction member (5) is a chain; or the transmission wheel (4) and the output wheel are both pulleys, and the corresponding flexible traction member (5) is a belt.

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