WO2022233018A1

WO2022233018A1 - Pedal force measurement mechanism and electric power-assisted bicycle

Info

Publication number: WO2022233018A1
Application number: PCT/CN2021/092063
Authority: WO
Inventors: 唐明喜; 陈世伟
Original assignee: 深圳市喜德盛自行车股份有限公司
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2022-11-10

Abstract

A pedal force measurement mechanism and an electric power-assisted bicycle. The pedal force measurement mechanism comprises a main shaft (1), a driving wheel (2), a flywheel (3) and a force measurement assembly (4), wherein the main shaft (1) is arranged on an outer frame; the driving wheel (2) is rotationally sleeved on the main shaft (1) and used for outputting power; the flywheel (3) is rotationally sleeved on the main shaft (1), and the flywheel (3) is in transmission connection with the driving wheel (2) so as to drive the driving wheel (2) to rotate; and the force measurement assembly (4) is arranged between the main shaft (1) and the flywheel (3) so as to be squeezed by the flywheel (3) when the flywheel (3) rotates, and the force measurement assembly (4) is used for converting a force signal of the flywheel (3) squeezing the force measurement assembly (4) into an electric signal. The driving wheel (2) is rotationally sleeved on the main shaft (1), and the force measurement assembly (4) is arranged between the main shaft (1) and the flywheel (3), such that an impact force on the driving wheel (2) cannot be directly transferred to the force measurement assembly (4), thereby reducing the impact on the force measurement assembly (4) and reducing the failure rate of the force measurement assembly (4). The electrical signal can be directly transmitted to an external controller, such that no additional signal transmission mechanism is needed to transmit the signal, thereby simplifying the pedal force measurement work of the pedal force measurement mechanism.

Description

Tread force measuring mechanism and electric bicycle

technical field

The present application relates to the technical field of pressure measurement, in particular to a pedaling force measurement mechanism and an electric bicycle.

Background technique

Electric moped is a kind of riding tool between bicycles and electric bicycles. It not only enables riders to enjoy the fun of riding, but also makes the riding process more comfortable and labor-saving. The main working principle of electric mopeds is as follows: : The pedaling force measuring mechanism detects the pedaling force information of the rider during the riding process, and feeds the pedaling force information to the controller; the controller adjusts the output power of the drive motor to assist human riding. For example, when riding on flat ground or downhill sections, the riding is brisk and the pedaling force used by the rider is small. At this time, the controller controls the output power of the drive motor to reduce or not output power. When riding on a climbing road, the riding is cumbersome and the pedaling force used by the rider is relatively large. At this time, the controller controls the drive motor to increase the output power, thereby reducing the pedaling force required by the rider.

It can be seen that the pedaling force measurement mechanism is a crucial component in the electric bicycle. For the pedal force measuring mechanism, the central axis type force measuring mechanism is usually used to measure the force. The central axis type force measuring mechanism uses the strain gauge attached to the central axis or the deformed body of the central axis to measure the pedaling force. The central axis force measuring mechanism usually has the following defects: First, when the central axis force measuring mechanism performs the force measurement work, a complex signal transmission mechanism is also required to transmit the signal of the central axis force measuring mechanism to the controller, so that the The measurement work of the pedaling force measuring mechanism is complicated; secondly, the central axis force measuring mechanism has a high failure rate and is easy to damage. and other damages, so that the central axis force measuring mechanism fails or is damaged.

technical problem

One of the purposes of the embodiments of the present application is to provide a pedaling force measurement mechanism, which aims to solve the problems of complicated measurement work and high failure rate of the pedaling force measurement mechanism in the prior art.

technical solutions

In order to solve the above-mentioned technical problems, the technical solutions adopted in the embodiments of the present application are:

Provide a pedal force measuring mechanism, including:

Spindle for setting on the outer frame;

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

a flywheel, which is rotatably sleeved on the main shaft, and the flywheel is drivingly connected to the driving wheel to drive the driving wheel to rotate;

A force measuring assembly is arranged between the main shaft and the flywheel, so as to be squeezed by the flywheel when the flywheel rotates, and the force measuring assembly is used to squeeze the flywheel to the force measuring assembly The force signal on is converted into an electrical signal.

In one embodiment, the force measuring assembly is fixed on the main shaft.

In one embodiment, the force-measuring component is sleeve-shaped; the force-measuring component is movably sleeved between the main shaft and the flywheel, or the force-measuring component is sleeved between the main shaft and the flywheel between the flywheels and fixed on the main shaft.

In one embodiment, the force-measuring component is block-shaped; the force-measuring component is one, or the force-measuring component is at least two, and the at least two force-measuring components are evenly distributed in the circumferential direction between the main shaft and the flywheel.

In one embodiment, the force measuring assembly includes:

a pressure sleeve, sleeved between the main shaft and the flywheel, the flywheel can rotate relative to the pressure sleeve, and squeezes the pressure sleeve during rotation;

A force measuring strain gauge is arranged on the pressure sleeve to convert the force signal of the flywheel pressed on the pressure sleeve into an electrical signal.

In one embodiment, a bearing is connected between the pressure sleeve and the flywheel.

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

In one embodiment, the pressure sleeve is spaced from the main shaft to form a deformation gap.

In one embodiment, the pressure sleeve has a first end portion and a second end portion connected in sequence along the axial direction, the first end portion of the pressure sleeve is fixed on the main shaft; the first end portion of the pressure sleeve is fixed on the main shaft; The two ends are spaced apart from the main shaft to form the deformation gap, and the second end of the pressure sleeve can be squeezed by the flywheel when the flywheel rotates, and the force measuring strain gauge is at least partially arranged on the the second end of the pressure jacket.

In one embodiment, the pressure sleeve has a first end portion, a middle portion and a second end portion connected in sequence along the axial direction, and the first end portion and the second end portion of the pressure sleeve are both fixed to the main shaft upper; the middle part of the pressure sleeve is spaced from the main shaft to form the deformation gap, and the force measuring strain gauge is at least partially arranged in the middle part of the pressure sleeve.

In one embodiment, the pressure sleeve is provided with one force-measuring strain gauge; or, at least two force-measuring strain gauges are provided on the pressure sleeve, and the at least two force-measuring strain gauges are arranged along the The pressure sleeves are distributed at intervals in the circumferential direction.

In one embodiment, the pressure sleeve is further covered with a protective sleeve, the pressure sleeve and the protective sleeve are enclosed to form a closed cavity, and the force measuring strain gauge is arranged in the cavity.

In one embodiment, the pressure sleeve is further provided with a circuit board electrically connected to the force-measuring strain gauge, and the circuit board is used for amplifying the electrical signal of the force-measuring strain gauge.

In one embodiment, the pedaling force measuring mechanism further includes a ratchet mechanism connected between the flywheel and the driving wheel, and the flywheel drives the driving wheel to rotate in one direction through the ratchet mechanism.

In one embodiment, the ratchet mechanism includes a pawl set on the flywheel and a ratchet wheel set on the driving wheel, the pawl is drivingly connected to the ratchet wheel to form the flywheel and the ratchet wheel One-way transmission of drive wheels.

In one embodiment, a magnetic member is also fixed on the flywheel, and a magnetic induction member is arranged on the force measuring component at a distance from the magnetic member, and the magnetic induction member is used to detect the motion state to obtain the motion state of the flywheel.

In a second aspect, an electric bicycle is provided, including the above-mentioned pedaling force measuring mechanism.

beneficial effect

The beneficial effect of the pedaling force measuring mechanism provided by the embodiment of the present application is that: compared with the prior art, the pedaling force measuring mechanism of the present application comprises a main shaft, a driving wheel, a flywheel and a force measuring assembly, and the force measuring assembly is arranged between the main shaft and the flywheel, And it is used to convert the force signal of the flywheel squeezed on the force measuring component into an electrical signal; when the pedaling force measuring mechanism works, the flywheel rotates to drive the driving wheel to rotate, so that the driving wheel outputs power, and the flywheel squeezes the force measuring component when it rotates. The force measuring component converts the force signal squeezed by the flywheel on the force measuring component into an electrical signal, and can directly transmit the electrical signal to the external controller. In this way, there is no need for another signal transmission mechanism to transmit the signal, which simplifies the pedaling force measurement. The pedal force measurement of the mechanism works, and the structure of the pedal force measurement mechanism is relatively simple. Secondly, in complex areas such as potholes, when the driving wheel is hit or bumped, the impact force on the driving wheel cannot be directly transmitted because the driving wheel and the main shaft are rotated and sleeved, and the force measuring component is installed between the main shaft and the flywheel. The force-measuring component is provided to protect the force-measuring component, thus reducing the impact force on the force-measuring component, thereby reducing the failure rate of the force-measuring component and increasing the service life of the force-measuring component. Since the electric bicycle of the present application has the pedaling force measuring mechanism of the present application, it also has the advantages of the pedaling force measuring mechanism.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or exemplary technologies. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the front view structure schematic diagram of the pedaling force measuring mechanism provided by the embodiment 1 of this application;

Fig. 2 is the sectional structure schematic diagram of the pedaling force measuring mechanism provided by the embodiment 1 of the present application;

Fig. 3 is a partial enlarged structural schematic diagram 1 of Fig. 2;

Fig. 4 is the partial enlarged structural schematic diagram 2 of Fig. 2;

5 is a schematic cross-sectional structure diagram of a pedaling force measuring mechanism provided in Embodiment 2 of the present application;

Fig. 6 is the partial enlarged structural schematic diagram 1 of Fig. 5;

FIG. 7 is a second partially enlarged structural schematic diagram of FIG. 5 .

Embodiments of the present invention

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present application.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description, rather than indicating or implying the referred device Or the elements must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be construed as a limitation to the present application, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations. The terms "first" and "second" are only used for the purpose of description, and should not be understood as indicating or implying relative importance or implying indicating the number of technical features. "Plurality" means two or more, unless expressly specifically limited otherwise.

In order to illustrate the technical solutions provided in the present application, the following detailed description is given in conjunction with the specific drawings and embodiments.

Some embodiments of the present application provide pedal force measurement mechanisms for illustration.

Example 1

Please refer to 1 and FIG. 2 together, and now the pedaling force measuring mechanism provided by the embodiment of the present application will be described. The pedaling force measuring mechanism includes a main shaft 1 , a driving wheel 2 , a flywheel 3 and a force measuring assembly 4 .

It should be noted here that, as shown in Figure 1, the working principle of the electric bicycle is as follows: when riding, the rider steps on the pedals to drive the crankset 10 to rotate, and the crankset 10 transmits the power to the flywheel 3 through the chain 11, The flywheel 3 drives the driving wheel 2 to rotate, so that the driving wheel 2 outputs power to drive the wheel to rotate, thereby realizing the movement of the frame, that is, the movement of the electric power-assisted vehicle. The driving wheel 2 is also provided with driving parts such as a motor, which can convert electric energy into kinetic energy through the power carried by the electric bicycle body to assist human riding. After starting to ride, the force measuring component 4 on the electric bicycle detects the pedaling force information, converts the pedaling force information into an electrical signal, and feeds it back to the controller, which controls the power output of the driving wheel 2 . When the pedaling force increases, the force measuring component 4 feeds back an electrical signal, and controls the driving wheel 2 to increase the output power. When the pedaling force decreases, the force-measuring component 4 feeds back an electrical signal to control the driving wheel 2 to reduce or interrupt the output power.

Please refer to FIG. 2 , the main shaft 1 is arranged on the outer frame; it can be understood that the main shaft 1 is fixedly mounted on the outer frame, and can also be rotatably arranged on the outer frame. The driving wheel 2 is rotatably sleeved on the main shaft 1 and used for outputting power. The flywheel 3 is rotatably sleeved on the main shaft 1 , and the flywheel 3 is drivingly connected to the driving wheel 2 to drive the driving wheel 2 to rotate. The force measuring assembly 4 is arranged between the main shaft 1 and the flywheel 3, and can be squeezed by the flywheel 3 when the flywheel 3 rotates. When the force measuring assembly 4 is squeezed by the flywheel 3, it can squeeze the flywheel 3 to the force measuring assembly. The force signal on 4 is converted into an electrical signal.

In the embodiment of the present application, the force measuring assembly 4 is arranged between the main shaft 1 and the flywheel 3, and is used to convert the force signal of the flywheel 3 on the force measuring assembly 4 into an electrical signal; when the pedaling force measuring mechanism works, the flywheel 3 Rotate to drive the driving wheel 2 to rotate, so that the driving wheel 2 outputs power, the flywheel 3 squeezes the force measuring component 4 when it rotates, and the force measuring component 4 converts the force signal that the flywheel 3 squeezes on the force measuring component 4 into an electrical signal, The electric signal can be directly transmitted to the external controller, so that no other signal transmission mechanism is needed to transmit the signal, the pedaling force measurement work of the pedaling force measuring mechanism is simplified, and the structure of the pedaling force measuring mechanism is relatively simple. Secondly, in complex areas such as potholes, when the driving wheel 2 is hit or bumped, since the driving wheel 2 and the main shaft 1 are rotated and sleeved, and the force measuring component 4 is arranged between the main shaft 1 and the flywheel 3, the driving wheel 2 The impact force received cannot be directly transmitted to the force measuring component 4, so as to realize the protection of the force measuring component 4, thus reducing the impact force on the force measuring component 4, thereby reducing the failure rate of the force measuring component, and improving the the service life of the force measuring components. In addition, both the driving wheel 2 and the flywheel 3 are sleeved on the main shaft 1, so that the main shaft 1 will not directly collide with the ground bumps or rocks when riding, so as to protect the main shaft 1 and further realize the force measurement component 4. protection, further reducing the failure rate of the force measuring component 4.

Referring to FIG. 4 , in this embodiment, the force measuring component 4 is movably arranged between the main shaft 1 and the flywheel 3 , and the force measuring component 4 can rotate or move relative to the main shaft 1 , so as to adjust the force measuring position of the force measuring component 4 . Alternatively, the force measuring assembly 4 is arranged between the main shaft 1 and the flywheel 3, and is fixed on the main shaft 1 to ensure that the pressure position of the flywheel 3 to the force measuring assembly 4 is the same position, and the force measuring accuracy of the force measuring assembly 4 is ensured.

As shown in FIG. 4 , the force-measuring component 4 is in the shape of a sleeve; in another embodiment, the force-measuring component 4 can also be in the shape of a block; there are one or more force-measuring components 4 , when there are multiple force-measuring components 4 , a plurality of force measuring components 4 are evenly distributed between the main shaft 1 and the flywheel 3 along the circumferential direction. After the flywheel 3 squeezes the force measuring assembly 4, the pressure signal can also be converted into an electrical signal. The force measuring assembly 4 can also be fixed on the external frame, and can also play the role of measuring the pressing pressure of the flywheel 3 when the flywheel 3 rotates, which should also belong to an embodiment protected by the present 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 main shaft 1 and the flywheel 3, and can be squeezed by the flywheel 3 when the flywheel 3 rotates; The strain gauge 42 is installed on the pressure sleeve 41 to convert the force signal of the flywheel 3 pressing on the pressure sleeve 41 into an electrical signal.

When in use, the pedaling force is converted into the traction force of the chain 11 on the flywheel 3, and the traction force pulls the flywheel 3, so that the flywheel 3 produces pressure on the pressure sleeve 41, and the pressure sleeve 41 is compressed to produce bending deformation, and the force measuring strain gauge 42 is also deformed. The force-measuring strain gauge 42 generates a corresponding electrical signal according to the amount of deformation. Among them, the force measuring strain gauge 42 is a resistive strain gauge or a pressure sensor or the like. The pressure acts on the force-measuring strain gauge 42, causing the force-measuring strain gauge 42 to deform, and the resistance element in the force-measuring strain gauge 42 also deforms accordingly. The deformation causes the cross-sectional area or length of the resistance element to change, and the resistance value is Change, and subsequently change the magnitude of the current or voltage in the circuit, thus completing the process of converting pressure information into an electrical signal.

As shown in FIG. 4 , the bearing 5 is connected between the pressure sleeve 41 and the flywheel 3 . Since the pressure sleeve 41 is a fixed part fixed on the main shaft 1 and the flywheel 3 is a moving part, the pressure sleeve 41 and the flywheel 3 are prone to wear, and the greater the pressure of the flywheel 3 on the pressure sleeve 41, the more serious the wear. The bearing 5 can not only play the role of carrying the pressure between the flywheel 3 and the pressure sleeve 41, but also reduce the friction between the flywheel 3 and the pressure sleeve 41, that is, reduce the wear between the flywheel 3 and the pressure sleeve 41, and extend the pressure sleeve. 41 service life. Wherein, the bearing 5 can 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 squeezes the pressure sleeve 41 and rotates relative to the pressure sleeve 41. At this time, the inner wall of the flywheel 3 and the pressure The outer side wall of the sleeve 41 can be set as a smooth surface.

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 bending 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 along the axial direction, and the first end 411 of the pressure sleeve 41 is fixed on the main shaft 1 by fasteners such as nuts to prevent The pressure sleeve 41 moves or rotates on the main shaft 1; the second end 412 of the pressure sleeve 41 is spaced from the main shaft 1 to form a deformation gap a, which increases the deformation space of the second end 412, and the second end 412 of the pressure sleeve 41 is spaced from the main shaft 1 to form a deformation gap a. It can be squeezed by the flywheel 3 when the flywheel 3 rotates. The force measuring strain gauge 42 can be integrally provided on the second end 412 of the pressure sleeve 41, or partially provided on the first end 411, and the rest is provided on the second end On 412, the force-measuring strain gauge 42 converts the deformation amount of the second end portion 412 under compression into an electrical signal.

As shown in FIGS. 3 and 4 , the pressure sleeve 41 is provided with two force-measuring strain gauges 42 , and the two force-measuring strain gauges 42 are distributed at intervals along the circumferential direction of the pressure sleeve 41 . One of the force-measuring strain gauges 42 is used to measure the deformation of the outwardly protruding portion of the pressure sleeve 41 after being deformed under pressure, and the other force-measuring strain gauge 42 is used to measure the deformation of the inwardly concave portion of the pressure sleeve 41 after being compressed and deformed. The protruding part of the pressure sleeve 41 makes the force-measuring strain gauge 42 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 concave portion of the pressure sleeve 41 makes the force measuring strain gauge 42 bear compressive stress, so that the length of the force measuring strain gauge 42 is reduced, the cross-sectional area is increased, and the resistance is reduced.

The force-measuring direction of the two force-measuring strain gauges 42 is in the same direction as the force-receiving direction of the flywheel 3 extruding the pressure sleeve 41, so that the pressure of the flywheel 3 does not produce component forces in other directions, and the force-measuring value on the force-measuring strain gauge 42 is the highest. precise.

In another embodiment, one or more than three force-measuring strain gauges 42 may be provided on the pressure sleeve 41 , and the force-measuring strain gauges 42 along the axial, radial and other directions of the pressure sleeve 41 should also be protected by the present application an example of .

In this embodiment, the pressure sleeve 41 is also covered with a protective sleeve 43. The pressure sleeve 41 and the protective sleeve 43 are enclosed to form a closed cavity b. Mud enters to prevent the force measuring strain gauge 42 from being worn, corroded, and the like.

As shown in FIG. 3 , the pressure sleeve 41 is also provided with a circuit board 6 electrically connected to the force measuring strain gauge 42 , and the circuit board 6 is used to amplify the electrical signal of the force measuring strain gauge 42 . The electrical signal on the force-measuring strain gauge 42 is amplified by the circuit board 6 , so that the electric signal of the force-measuring strain gauge 42 is clearer, which is convenient for the controller to identify.

As shown in FIG. 3 , the pedaling force measuring mechanism further includes 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 has the advantages of simple structure, reliable operation and high mechanical efficiency, and ensures that the flywheel 3 drives the driving wheel 2 normally.

In this embodiment, the ratchet mechanism 7 includes a ratchet 71 provided on the flywheel 3 and a ratchet 72 provided on the driving wheel 2. The ratchet 71 is drivingly connected to the ratchet 72 to form a one-way transmission between the flywheel 3 and the driving wheel 2. . When the flywheel 3 is reversed, the pawl 71 and the ratchet 72 slip, and the driving wheel 2 will not be reversed.

As shown in FIG. 2 and FIG. 4 , the flywheel 3 is also fixed with a magnetic member 8 , and the force measuring component 4 is provided with a magnetic induction member 9 spaced from the magnetic member 8 . on set 41. The magnetic sensing element 9 is used to detect the motion state of the magnetic element 8 to obtain the motion state of the flywheel 3 . The magnetic element 8 can be a magnetic sheet, a magnetic ring or a magnetic particle, etc.; the magnetic sensing element 9 can be a Hall sensor, a Hall switch, and the like. The flywheel 3 drives the magnetic member 8 to move, and moves relatively with the magnetic induction member 9 fixed on the force measuring component 4. The magnetic induction member 9 detects the change of the magnetic field strength and generates an induced current or an induced voltage, thereby causing the flywheel 3 to move. The motion state is transformed into an electrical signal that the controller can recognize, and the drive wheel 2 is activated by 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 present application also provides an electric bicycle, including the pedaling force measuring mechanism of the above embodiment. Since the electric bicycle includes the pedaling force measuring mechanism of the above-mentioned embodiment, it also has the advantages of the pedaling force measuring mechanism.

Example 2

As shown in FIGS. 5 and 6 , this embodiment is basically the same as Embodiment 1, except that the 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. The first end 411 and the second end 412 of the pressure sleeve 41 are both fixed on the main shaft 1; the middle part 413 of the pressure sleeve 41 is spaced from the main shaft 1 to form a deformation gap a, and the dynamometric strain gauge 42 is wholly or partially arranged in the middle part of the pressure sleeve 41 413.

Compared with the first embodiment, the first end 411 and the second end 412 of the pressure sleeve 41 in this embodiment are both fixed on the main shaft 1, and the deformation range of the pressure sleeve 41 is restricted in the middle 413 area, which is conducive to measuring the force. The strain gauges 42 are located in the main deformation area, which makes the measurement more accurate. It can also make the pressure sleeve 41 and the main shaft 1 have better centering, so that the flywheel 3 connected to the pressure sleeve 41 and the driving wheel 2 connected to the main shaft 1 also have better centering, so that the flywheel 3 has better centering. When the driving wheel 2 is driven by the ratchet mechanism 7 , each pawl 71 can engage the ratchet 72 at the same time, thereby improving the working stability of the ratchet mechanism 7 . In addition to the above-mentioned embodiments, the force measuring strain gauge 42 may be partially disposed on the first end portion 411 and the rest portion is disposed on the middle portion 413 , or partially disposed on the second end portion 412 and the rest portion is disposed on the center portion 413 .

As shown in FIG. 7 , the pressure sleeve 41 is provided with deformation holes 44 , there are two deformation holes 44 , and the two deformation holes 44 are evenly distributed on the pressure sleeve 41 along the circumferential direction. The axial direction of the deformation hole 44 is perpendicular to the force-bearing direction of the flywheel 3 pressing on the pressure sleeve 41 . The deformation hole 44 reduces the rigidity of the pressure sleeve 41 in the radial direction, the pressure sleeve 41 is more easily deformed after being squeezed by the flywheel 3 , and the deformation amount is larger, which is 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 should also belong to an embodiment protected by the present application.

The above are only optional embodiments of the present application, and are not intended to limit the present application. Various modifications and variations of this application are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

A pedaling force measuring mechanism, comprising:

main shaft (1) for setting on the outer frame;

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

a flywheel (3), which is rotatably sleeved on the main shaft (1), and the flywheel (3) is drivingly connected to the driving wheel (2) to drive the driving wheel (2) to rotate;

A force measuring assembly (4), arranged between the main shaft (1) and the flywheel (3), so as to be squeezed by the flywheel (3) when the flywheel (3) rotates, and the force measuring The assembly (4) is used to convert the force signal of the flywheel (3) pressed on the force measuring assembly (4) into an electrical signal.
The pedaling force measuring mechanism according to claim 1, wherein the force measuring assembly (4) is fixed on the main shaft (1).
The pedaling force measuring mechanism according to claim 1, characterized in that the force measuring assembly (4) is sleeve-shaped; the force measuring assembly (4) is movably sleeved on the main shaft (1) and the flywheel ( 3), or, the force measuring assembly (4) is sleeved between the main shaft (1) and the flywheel (3), and is fixed on the main shaft (1).
The pedaling force measuring mechanism according to claim 1, characterized in that, the force measuring component (4) is block-shaped; the force measuring component (4) is one, or the force measuring component (4) is at least one Two, and at least two of the force measuring components (4) are evenly distributed between the main shaft (1) and the flywheel (3) along the circumferential direction.
The pedaling force measuring mechanism according to any one of claims 1 to 3, wherein the force measuring component (4) comprises:

A pressure sleeve (41) is sleeved between the main shaft (1) and the flywheel (3), the flywheel (3) can rotate relative to the pressure sleeve (41), and when rotating, squeeze the flywheel (3) pressure sleeve (41);

A force measuring strain gauge (42) is arranged on the pressure sleeve (41) to convert the force signal of the flywheel (3) pressed on the pressure sleeve (41) into an electrical signal.
The pedaling force measuring mechanism according to claim 5, wherein a bearing (5) is connected between the pressure sleeve (41) and the flywheel (3).
The pedaling force measuring mechanism according to claim 5, wherein the pressure sleeve (41) is provided with a deformation hole (44), the deformation hole (44) is one, or the deformation hole (44) There are at least two, and at least two of the deformation holes (44) are uniformly distributed on the pressure sleeve (41) along the circumferential direction.
The pedaling force measuring mechanism according to claim 5, characterized in that, the pressure sleeve (41) is spaced from the main shaft (1) to form a deformation gap (a).
The pedaling force measuring mechanism according to claim 8, wherein the pressure sleeve (41) has a first end (411) and a second end (412) connected in sequence along the axial direction, and the pressure sleeve (41) The first end (411) of (41) is fixed on the main shaft (1); the second end (412) of the pressure sleeve (41) is spaced from the main shaft (1) to form the deformation gap ( a), and the second end (412) of the pressure sleeve (41) can be squeezed by the flywheel (3) when the flywheel (3) rotates, and the force measuring strain gauge (42) is at least partially It is arranged on the second end (412) of the pressure sleeve (41).
The pedaling force measuring mechanism according to claim 8, wherein the pressure sleeve (41) has a first end (411), a middle portion (413) and a second end (412) connected in sequence along the axial direction , the first end (411) and the second end (412) of the pressure sleeve (41) are both fixed on the main shaft (1); the middle part (413) of the pressure sleeve (41) and the The main shaft (1) is spaced to form the deformation gap (a), and the force measuring strain gauge (42) is at least partially arranged in the middle part (413) of the pressure sleeve (41).
The pedaling force measuring mechanism according to claim 5, characterized in that, the pressure sleeve (41) is provided with one force measuring strain gauge (42); or, the pressure sleeve (41) is provided with at least two Each of the force-measuring strain gauges (42), at least two of the force-measuring strain gauges (42) are distributed at intervals along the circumferential direction of the pressure sleeve (41).
The pedaling force measuring mechanism according to claim 5, characterized in that, a protective sleeve (43) is further sleeved on the pressure sleeve (41), and the pressure sleeve (41) and the protective sleeve (43) are enclosed to form a protective sleeve (43). A closed cavity (b), the force measuring strain gauge (42) is arranged in the cavity (b).
The pedaling force measuring mechanism according to claim 5, characterized in that, the pressure sleeve (41) is further provided with a circuit board (6) electrically connected to the force measuring strain gauge (42), the circuit board (6) For amplifying the electrical signal of the force-measuring strain gauge (42).
The pedaling force measuring mechanism according to any one of claims 1 to 3, characterized in that, the pedaling force measuring mechanism further comprises a ratchet mechanism ( 7), the flywheel (3) drives the driving wheel (2) to rotate in one direction through the ratchet mechanism (7).
The pedaling force measuring mechanism according to claim 14, wherein the ratchet mechanism (7) comprises a pawl (71) provided on the flywheel (3) and a ratchet (71) provided on the driving wheel (2). A ratchet (72), the pawl (71) is drivingly connected to the ratchet (72) to form a one-way transmission between the flywheel (3) and the driving wheel (2).
The pedaling force measuring mechanism according to any one of claims 1 to 3, characterized in that, the flywheel (3) is further fixed with a magnetic member (8), and the force measuring component (4) is provided with a Magnetic induction members (9) arranged at intervals from the magnetic member (8), the magnetic induction members (9) are used to detect the motion state of the magnetic member (8), so as to obtain the motion state of the flywheel (3). .
An electric bicycle, characterized in that it comprises: the pedaling force measuring mechanism according to any one of claims 1 to 16.