CN215590917U - Pedal force measuring mechanism and electric moped - Google Patents

Abstract

The application provides a pedal force measuring mechanism which comprises a main shaft, a driving wheel, a flywheel and a force measuring assembly, wherein the force measuring assembly is arranged between the main shaft and the flywheel and used for converting a force signal of the flywheel extruded on the force measuring assembly into an electric signal; therefore, an additional signal transmission mechanism is not needed for transmitting signals, the pedal force measuring work of the pedal force measuring mechanism is simplified, and the pedal force measuring mechanism is relatively simple in structure. Secondly, in complicated fields such as hollow fields, when the driving wheel is impacted or collided, the driving wheel and the main shaft are rotatably sleeved, and the force measuring assembly is arranged between the main shaft and the flywheel, so that the impact force applied to the driving wheel cannot be directly transmitted to the force measuring assembly, the force measuring assembly is protected, the impact force applied to the force measuring assembly is reduced, the failure rate of the force measuring assembly is reduced, and the service life of the force measuring assembly is prolonged. The electric bicycle of the present application also has the advantages of this pedal force measuring mechanism.

Description

Pedal force measuring mechanism and electric moped

Technical Field

The application belongs to the technical field of pressure measurement, and more particularly relates to a pedal force measuring mechanism and an electric moped.

Background

Electric bicycle is the instrument of riding between bicycle and electric motor car, not only makes and rides passerby and can enjoy the enjoyment of riding and bringing, can also make the process of riding more comfortable, laborsaving, and electric bicycle's main theory of operation does: the pedaling force measuring mechanism detects the pedaling force information of the rider in the riding process and feeds the pedaling force information back to the controller; the controller adjusts the size of the output power of the driving motor and assists in manual riding. For example: when the bicycle is ridden on a flat ground or a downhill road section, the bicycle is ridden lightly, the pedaling force used by a rider is small, and the controller controls the driving motor to output power to reduce or not output power. When riding on the climbing road section, the riding is heavy, the pedaling force used by the rider is large, and the controller controls the driving motor to increase the output power, so that the pedaling force required by the rider is reduced.

Therefore, the pedal force measuring mechanism is an important component of the electric bicycle. For the pedal force measuring mechanism, a central axis type force measuring mechanism is generally adopted for measuring force. The middle shaft type force measuring mechanism measures the magnitude of the pedal force by adopting a strain gauge attached to a middle shaft or a middle shaft deformation body. The centre shaft force measuring mechanism generally has the following disadvantages: firstly, when the central axis type force measuring mechanism carries out force measuring work, a complex signal transmission mechanism is needed to transmit a signal of the central axis type force measuring mechanism to the controller, so that the measuring work of the pedal force measuring mechanism is complicated; secondly, the middle shaft type force measuring mechanism has high failure rate and is easy to damage, for example, when the bicycle is ridden in a complex section such as a hollow section, the middle shaft type force measuring mechanism is easy to be damaged by falling impact, collision and the like, so that the middle shaft type force measuring mechanism has failure, damage and the like.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the present application is to provide a pedal force measuring mechanism to solve the technical problems of complicated measuring operation and high failure rate of the pedal force measuring mechanism in the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a pedal force measuring mechanism including:

the main shaft is used for being arranged on the external frame;

the driving wheel is rotatably sleeved on the main shaft and used for outputting power;

the flywheel is rotatably sleeved on the main shaft; the flywheel is in transmission connection with the driving wheel so as to drive the driving wheel to rotate;

the force measuring assembly is arranged between the main shaft and the flywheel, is fixed on the main shaft and is extruded by the flywheel when the flywheel rotates, and is used for converting a force signal extruded on the force measuring assembly by the flywheel into an electric signal.

As a further improvement of the above technical solution:

optionally, the force measuring assembly is movably arranged between the main shaft and the flywheel; or the force measuring assembly is arranged between the main shaft and the flywheel and is fixed on the main shaft.

Optionally, the force measuring assembly comprises:

the pressure sleeve is sleeved between the main shaft and the flywheel and is extruded by the pressure sleeve when the flywheel rotates;

and the force measuring strain gauge is arranged on the pressure sleeve and is used for converting a force signal of the flywheel extruded on the pressure sleeve into an electric signal.

Optionally, the pressure sleeve is provided with one deformation hole, or the number of the deformation holes is at least two, and the at least two deformation holes are uniformly distributed on the pressure sleeve along the circumferential direction.

Optionally, the pressure sleeve and the main shaft form a deformation gap at an interval.

Optionally, the pressure sleeve has a first end and a second end connected in sequence in the axial direction, and the first end of the pressure sleeve is fixed on the main shaft; the second end of the pressure sleeve and the main shaft form the deformation gap at intervals, the second end of the pressure sleeve can be extruded by the flywheel when the flywheel rotates, and the force measuring strain gauge is at least partially arranged at the second end of the pressure sleeve.

Optionally, the pressure sleeve has a first end portion, a middle portion and a second end portion connected in sequence in the axial direction, and the first end portion and the second end portion of the pressure sleeve are both fixed on the main shaft; the middle part of the pressure sleeve and the main shaft form the deformation clearance at intervals, and the force measuring strain gauge is at least partially arranged in the middle part of the pressure sleeve.

Optionally, a bearing is connected between the pressure sleeve and the flywheel.

Optionally, the pedal force measuring mechanism further comprises a ratchet mechanism connected between the flywheel and the driving wheel, and the flywheel drives the driving wheel to rotate in a single direction through the ratchet mechanism.

An electric bicycle comprises the pedal force measuring mechanism.

The application provides a step force measuring mechanism and electric bicycle's beneficial effect lies in: compared with the prior art, the pedal force measuring mechanism comprises a main shaft, a driving wheel, a flywheel and a force measuring assembly, wherein the force measuring assembly is arranged between the main shaft and the flywheel and used for converting a force signal of the flywheel extruded on the force measuring assembly into an electric signal; when the pedal force measuring mechanism works, the flywheel rotates to drive the driving wheel to rotate, so that the driving wheel outputs power, the flywheel extrudes the force measuring assembly when rotating, a force signal of the flywheel extruded on the force measuring assembly is converted into an electric signal by the force measuring assembly, and the electric signal can be directly transmitted to an external controller. Secondly, in complicated fields such as hollow fields, when the driving wheel is impacted or collided, the driving wheel and the main shaft are rotatably sleeved, and the force measuring assembly is arranged between the main shaft and the flywheel, so that the impact force applied to the driving wheel cannot be directly transmitted to the force measuring assembly, the force measuring assembly is protected, the impact force applied to the force measuring assembly is reduced, the failure rate of the force measuring assembly is reduced, and the service life of the force measuring assembly is prolonged. The electric bicycle of the present application has the advantages of the pedal force measuring mechanism of the present application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic front view of a pedal force measuring mechanism according to embodiment 1 of the present application;

fig. 2 is a schematic cross-sectional structural view of a pedaling force measuring mechanism according to embodiment 1 of the present application;

FIG. 3 is a schematic diagram of a partial enlarged structure of FIG. 2;

FIG. 4 is a second partial enlarged view of FIG. 2;

fig. 5 is a schematic sectional view showing a pedal force measuring mechanism according to embodiment 2 of the present application;

FIG. 6 is a schematic diagram of a first partial enlarged structure of FIG. 5;

fig. 7 is a schematic diagram of a partially enlarged structure of fig. 5.

Wherein, in the figures, the respective reference numerals:

1-a main shaft; 2-driving wheels; 3-a flywheel; 4-a force measuring assembly; 41-pressure sleeve; 411-a first end portion; 412-a second end; 413-middle part; 42-a force measuring strain gauge; 43-a protective sheath; 44-deformation holes; 5-a bearing; 6-a circuit board; 7-a ratchet mechanism; 71-a pawl; 72-ratchet wheel; 8-a magnetic member; 9-a magnetic induction element; 10-a chain wheel; 11-a chain; a-a deformation gap; b-a cavity.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Example 1

Referring to fig. 1 and 2 together, a pedal force measuring mechanism according to an embodiment of the present application will now be described. The pedal force measuring mechanism comprises a main shaft 1, a driving wheel 2, a flywheel 3 and a force measuring assembly 4.

Here, as shown in fig. 1, the electric power assisted vehicle operates in the following manner: when riding, a rider tramples the pedal to drive the chain wheel 10 to rotate, the chain wheel 10 transmits power to the flywheel 3 through the chain 11, and the flywheel 3 drives the driving wheel 2 to rotate, so that the driving wheel 2 outputs power to drive the wheel to rotate, the frame is moved, and the electric moped is moved. Still be equipped with driving pieces such as motor in the drive wheel 2, can turn into kinetic energy, supplementary manpower is ridden with the electric energy through the power that electric bicycle automobile body carried. After the electric bicycle starts to ride, the force measuring assembly 4 on the electric bicycle detects the pedaling force information, converts the pedaling force information into an electric signal and feeds the electric signal back to the controller, and the controller controls the power output of the driving wheel 2. When the pedal force is increased, the force measuring assembly 4 feeds back an electric signal to control the driving wheel 2 to increase the output power. When the pedaling force is reduced, the force measuring assembly 4 feeds back an electric signal to control the driving wheel 2 to reduce or interrupt the output power.

Referring to fig. 2, the main shaft 1 is arranged on the external frame; it can be understood that the main shaft 1 is fixedly arranged on the external frame and can also be rotatably arranged on the external frame. The driving wheel 2 is rotatably sleeved on the main shaft 1 and is used for outputting power. The flywheel 3 is rotatably sleeved on the main shaft 1, and the flywheel 3 is in transmission connection with the driving wheel 2 to drive the driving wheel 2 to rotate. The force measuring assembly 4 is arranged between the spindle 1 and the flywheel 3 and can be extruded by the flywheel 3 when the flywheel 3 rotates, and when the force measuring assembly 4 is extruded by the flywheel 3, a force signal which is extruded on the force measuring assembly 4 by the flywheel 3 can be converted into an electric signal.

In the embodiment of the application, the force measuring assembly 4 is arranged between the spindle 1 and the flywheel 3 and is used for converting a force signal of the flywheel 3 extruded on the force measuring assembly 4 into an electric signal; when the pedal force measuring mechanism works, the flywheel 3 rotates to drive the driving wheel 2 to rotate, so that the driving wheel 2 outputs power, the flywheel 3 extrudes the force measuring component 4 when rotating, a force signal of the flywheel 3 extruded on the force measuring component 4 is converted into an electric signal by the force measuring component 4, and the electric signal can be directly transmitted to an external controller. Secondly, in complicated fields such as hollow fields, when the driving wheel 2 is impacted or collided, the driving wheel 2 and the main shaft 1 are rotatably sleeved, and the force measuring assembly 4 is arranged between the main shaft 1 and the flywheel 3, so that the impact force borne by the driving wheel 2 cannot be directly transmitted to the force measuring assembly 4, the force measuring assembly 4 is protected, the impact force borne by the force measuring assembly 4 is reduced, the failure rate of the force measuring assembly is reduced, and the service life of the force measuring assembly is prolonged. In addition, drive wheel 2 and flywheel 3 all cup joint on main shaft 1 for main shaft 1 can not directly bump with ground arch or stone when riding, realizes the protection to main shaft 1, thereby further realizes the protection to dynamometry subassembly 4, has further reduced dynamometry subassembly 4's fault rate.

Referring to fig. 4, in the present embodiment, the force measuring assembly 4 is movably disposed between the spindle 1 and the flywheel 3, and the force measuring assembly 4 can rotate or move relative to the spindle 1, so as to adjust the force measuring position of the force measuring assembly 4. Or the force measuring assembly 4 is arranged between the main shaft 1 and the flywheel 3 and is fixed on the main shaft 1, so that the same pressure position of the flywheel 3 on the force measuring assembly 4 is ensured, and the force measuring accuracy of the force measuring assembly 4 is ensured.

As shown in fig. 4, the force measuring assembly 4 is sleeve-shaped; in another embodiment, the force-measuring cell 4 can also be block-shaped; the number of the force measuring assemblies 4 is one or more, and when the number of the force measuring assemblies 4 is multiple, the force measuring assemblies 4 are uniformly distributed between the main shaft 1 and the flywheel 3 along the circumferential direction. The flywheel 3 can also convert the pressure signal into an electrical signal after pressing the force measuring assembly 4. The force measuring component 4 can also be fixed on an external frame, and can also play a role in measuring the extrusion pressure of the flywheel 3 when the flywheel 3 rotates, and the force measuring component also belongs to an embodiment protected by the application.

In this embodiment, the force measuring assembly 4 includes a pressure sleeve 41 and a force measuring strain gauge 42, the pressure sleeve 41 is sleeved between the spindle 1 and the flywheel 3, and can be pressed by the flywheel 3 when the flywheel 3 rotates; the force measuring strain gauge 42 is provided on the pressure jacket 41 to convert a force signal of the flywheel 3 pressed against the pressure jacket 41 into an electrical signal.

When the device is used, the pedal force is converted into the traction force of the chain 11 to the flywheel 3, the traction force pulls the flywheel 3, so that the flywheel 3 generates pressure to the pressure sleeve 41, the pressure sleeve 41 generates bending deformation under the pressure, and the force measuring strain gauge 42 also generates deformation. The load cell strain gauge 42 generates a corresponding electrical signal based on the amount of deformation. The force measuring gauge 42 is a resistance strain gauge or a pressure sensor. The pressure acts on the force-measuring strain gauge 42 to deform the force-measuring strain gauge 42, the resistance element in the force-measuring strain gauge 42 is correspondingly deformed, the deformation causes the cross-sectional area or length of the resistance element to change, the resistance value is also changed, and then the current or voltage in the circuit is changed, so that the process of converting the pressure information into the electric signal is completed.

As shown in fig. 4, a bearing 5 is connected between the pressure sleeve 41 and the flywheel 3. Because the pressure sleeve 41 is a fixed part fixedly arranged on the main shaft 1 and the flywheel 3 is a movable part, the pressure sleeve 41 and the flywheel 3 are easy to wear, and the larger the pressure of the flywheel 3 on the pressure sleeve 41 is, the more serious the wear is. The bearing 5 can play a role in bearing the pressure between the flywheel 3 and the pressure sleeve 41, and can also reduce the friction between the flywheel 3 and the pressure sleeve 41, namely, reduce the abrasion between the flywheel 3 and the pressure sleeve 41, and prolong the service life of the pressure sleeve 41. The bearing 5 may be a rolling bearing or a sliding bearing. In other embodiments, the flywheel 3 is directly sleeved on the pressure sleeve 41, and when the flywheel 3 rotates, the flywheel 3 rotates relative to the pressure sleeve 41 while pressing the pressure sleeve 41, and at this time, both the inner side wall of the flywheel 3 and the outer side wall of the pressure sleeve 41 can be set to be smooth surfaces.

As shown in fig. 4, the pressure sleeve 41 is spaced from the main shaft 1 to form a deformation gap a, which facilitates the bending deformation of the pressure sleeve 41 and leaves a deformation space for the pressure sleeve 41.

In this embodiment, the pressure sleeve 41 has a first end 411 and a second end 412 connected in sequence in the axial direction, and the first end 411 of the pressure sleeve 41 is fixed on the main shaft 1 by a fastening member such as a nut to prevent the pressure sleeve 41 from moving or rotating on the main shaft 1; the second end part 412 of the pressure sleeve 41 and the main shaft 1 form a deformation gap a at an interval, so that the deformation space of the second end part 412 is increased, and the second end part 412 of the pressure sleeve 41 can be extruded by the flywheel 3 when the flywheel 3 rotates; the load cell gauge 42 may be integrally provided on the second end portion 412 of the pressure jacket 41, or partially provided on the first end portion 411 and the remaining portion provided on the second end portion 412, the load cell gauge 42 converting the amount of deformation of the second end portion 412 after being pressed into an electrical signal.

As shown in fig. 3 and 4, two load cells 42 are provided on the pressure jacket 41, and the two load cells 42 are distributed in the circumferential direction of the pressure jacket 41. One of the force measuring strain gauges 42 is used for measuring the deformation of the pressure sleeve 41 to the outward bulging portion after being deformed by pressure, and the other force measuring strain gauge 42 is used for measuring the deformation of the pressure sleeve 41 to the inward recessed portion after being deformed by pressure. The protruding portion of the pressure sleeve 41 causes the force measuring strain gauge 42 to bear tensile stress, so that the length of the force measuring strain gauge 42 is lengthened, the cross-sectional area is reduced, and the resistance is increased. The recessed portion of the pressure jacket 41 causes the load cell gauge 42 to receive a compressive stress, so that the load cell gauge 42 is reduced in length, increased in cross-sectional area, and reduced in resistance.

The force measuring directions of the two force measuring strain gauges 42 are the same as the force receiving direction of the flywheel 3 extruding the pressure sleeve 41, so that the pressure of the flywheel 3 does not generate component force in other directions, and the force measuring values of the force measuring strain gauges 42 are the most accurate.

In another embodiment, one or more than three force measuring strain gauges 42 can be disposed on the pressure sleeve 41, and other directions of the force measuring strain gauges 42 along the axial direction, the radial direction and the like of the pressure sleeve 41 shall also belong to an embodiment protected by the present application.

In this embodiment, the pressure sleeve 41 is further sleeved with a protective sleeve 43, the pressure sleeve 41 and the protective sleeve 43 enclose to form a closed cavity b, and the force measuring strain gauge 42 is disposed in the cavity b, so as to prevent sand or sludge from entering, and prevent the force measuring strain gauge 42 from being worn and corroded.

As shown in fig. 3, the pressure jacket 41 is further provided with a circuit board 6 electrically connected to the load cell 42, and the circuit board 6 is used for amplifying the electrical signal of the load cell 42. The electric signal of the force measuring strain gauge 42 is amplified through the circuit board 6, so that the electric signal of the force measuring strain gauge 42 is clearer and is convenient for a controller to identify.

As shown in fig. 3, the pedaling force measuring mechanism further comprises a ratchet mechanism 7 connected between the flywheel 3 and the driving wheel 2, and the flywheel 3 drives the driving wheel 2 to rotate in one direction through the ratchet mechanism 7. The ratchet mechanism 7 also has the advantages of simple structure, reliable work, high mechanical efficiency and the like, and ensures that the flywheel 3 drives the driving wheel 2 normally.

In this embodiment, the ratchet mechanism 7 comprises a pawl 71 arranged on the flywheel 3 and a ratchet 72 arranged on the driving wheel 2, and the pawl 71 is in transmission connection with the ratchet 72 to form unidirectional transmission of the flywheel 3 and the driving wheel 2. When the flywheel 3 rotates in the reverse direction, the pawl 71 slips with the ratchet 72, and the drive wheel 2 does not rotate in the reverse direction.

As shown in fig. 2 and 4, the flywheel 3 is further fixedly provided with a magnetic member 8, the force measuring assembly 4 is provided with a magnetic sensing member 9 arranged at an interval with the magnetic member 8, and it can be understood that the magnetic sensing member 9 is arranged on the pressure sleeve 41. The magnetic sensing element 9 is used for detecting the motion state of the magnetic element 8 to acquire the motion state of the flywheel 3. The magnetic piece 8 can be a magnetic sheet, a magnetic ring or magnetic particles and the like; the magnetic induction element 9 can be a hall sensor, a hall switch, etc. The flywheel 3 drives the magnetic part 8 to move and moves relative to the magnetic sensing part 9 fixedly arranged on the force measuring component 4, the magnetic sensing part 9 detects the change of the magnetic field intensity to generate induction current or induction voltage, thereby converting the motion state of the flywheel 3 into an electric signal which can be identified by the controller, and starting the driving wheel 2 through the controller. Wherein, the magnetic induction member 9 can also be installed on the outer frame or on the protective sleeve 43 or in the cavity b between the pressure sleeve 41 and the protective sleeve 43.

The application also provides an electric moped, which comprises the pedal force measuring mechanism of the embodiment. Since the electric power assisted vehicle includes the pedal force measuring mechanism of the above embodiment, it also has an advantage of the pedal force measuring mechanism.

Example 2

As shown in fig. 5 and 6, the present embodiment is substantially the same as embodiment 1 except that: the pressure sleeve 41 has a first end 411, a middle 413 and a second end 412 connected in sequence along the axial direction, and both the first end 411 and the second end 412 of the pressure sleeve 41 are fixed on the main shaft 1; the middle part 413 of the pressure sleeve 41 is separated from the main shaft 1 to form a deformation gap a, and the force measuring strain gauge 42 is wholly or partially arranged on the middle part 413 of the pressure sleeve 41.

Compared with the embodiment 1, the first end portion 411 and the second end portion 412 of the pressure sleeve 41 of the embodiment are both fixed on the spindle 1, and the deformation region of the pressure sleeve 41 is constrained in the region of the middle portion 413, so that the force measuring strain gauge 42 is favorably arranged in the main deformation region, and the measurement is more accurate. The pressure sleeve 41 and the main shaft 1 can be well aligned, so that the flywheel 3 connected to the pressure sleeve 41 and the driving wheel 2 connected to the main shaft 1 also have good alignment, and when the flywheel 3 drives the driving wheel 2 through the ratchet mechanism 7, each pawl 71 can be simultaneously meshed with the ratchet 72, so that the working stability of the ratchet mechanism 7 is improved. In addition to the above embodiments, the load cell strain gauge 42 may be partially disposed on the middle portion 413 at the first end portion 411, or partially disposed on the middle portion 413 at the second end portion 412.

As shown in fig. 7, the pressure sleeve 41 is provided with two deformation holes 44, and the two deformation holes 44 are uniformly distributed on the pressure sleeve 41 along the circumferential direction. The axial direction of the deformation hole 44 is perpendicular to the direction in which the flywheel 3 is pressed against the pressure sleeve 41. The deformation hole 44 reduces the rigidity of the pressure sleeve 41 in the radial direction, so that the pressure sleeve 41 is more easily deformed after being squeezed by the flywheel 3, and the deformation is larger, thereby being beneficial to the measurement of the force measuring strain gauge 42.

In another embodiment, the pressure sleeve 41 may be provided with one or more than three deformation holes 44, which also belongs to an embodiment protected by the present application.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A pedal force measuring mechanism, comprising:

a main shaft (1) for being arranged on an external frame;

the driving wheel (2) is rotatably sleeved on the main shaft (1) and is used for outputting power;

the flywheel (3) is rotatably sleeved on the main shaft (1); the flywheel (3) is in transmission connection with the driving wheel (2) so as to drive the driving wheel (2) to rotate;

the force measuring assembly (4) is arranged between the spindle (1) and the flywheel (3), the force measuring assembly (4) is fixed on the spindle (1) so as to be extruded by the flywheel (3) when the flywheel (3) rotates, and the force measuring assembly (4) is used for converting a force signal of the flywheel (3) extruded on the force measuring assembly (4) into an electric signal.

2. The pedaling force measuring mechanism according to claim 1, wherein said force measuring assembly (4) is movably arranged between said main shaft (1) and said flywheel (3); or the force measuring assembly (4) is arranged between the main shaft (1) and the flywheel (3) and is fixed on the main shaft (1).

3. Pedal force measuring mechanism according to claim 1, wherein said force measuring assembly (4) comprises:

the pressure sleeve (41) is sleeved between the main shaft (1) and the flywheel (3) and is extruded by the pressure sleeve (41) when the flywheel (3) rotates;

and the force measuring strain gauge (42) is arranged on the pressure sleeve (41) and is used for converting a force signal of the flywheel (3) pressed on the pressure sleeve (41) into an electric signal.

4. The pedaling force measuring mechanism according to claim 3, wherein the pressure sleeve (41) is provided with one deformation hole (44), or at least two deformation holes (44) are provided, and at least two deformation holes (44) are uniformly distributed on the pressure sleeve (41) along the circumferential direction.

5. The pedaling force measuring mechanism according to claim 3, wherein said pressure housing (41) is spaced apart from said main shaft (1) to form a deformation gap (a).

6. The pedaling force measuring mechanism according to claim 5, wherein said pressure housing (41) has a first end portion (411) and a second end portion (412) connected in series in the axial direction, said first end portion (411) of said pressure housing (41) being fixed to said main shaft (1); the deformation clearance (a) is formed between the second end part (412) of the pressure sleeve (41) and the main shaft (1) at a distance, the second end part (412) of the pressure sleeve (41) can be pressed by the flywheel (3) when the flywheel (3) rotates, and the force measuring strain gauge (42) is at least partially arranged at the second end part (412) of the pressure sleeve (41).

7. The pedaling force measuring mechanism according to claim 5, wherein said pressure sleeve (41) has a first end portion (411), a middle portion (413) and a second end portion (412) connected in sequence along the axial direction, said first end portion (411) and said second end portion (412) of said pressure sleeve (41) are fixed on said main shaft (1); the deformation gap (a) is formed between the middle part (413) of the pressure sleeve (41) and the spindle (1) at intervals, and at least part of the force measuring strain gauge (42) is arranged in the middle part (413) of the pressure sleeve (41).

8. Pedaling force measuring mechanism according to any one of claims 3 to 7, wherein a bearing (5) is connected between said pressure sleeve (41) and said flywheel (3).

9. A pedaling force measuring mechanism according to any one of claims 1 to 7, further comprising a ratchet mechanism (7) connected between said flywheel (3) and said driving wheel (2), wherein said flywheel (3) drives said driving wheel (2) to rotate unidirectionally through said ratchet mechanism (7).

10. An electric power-assisted vehicle, characterized by comprising: a pedaling force measuring mechanism as defined in any one of claims 1 to 9.

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