Ultrathin intelligent barrel shaft motor and electric bicycle

Abstract

The utility model belongs to the technical field of bicycles, and particularly relates to an ultrathin intelligent barrel shaft motor and an electric bicycle. The ultrathin intelligent barrel shaft motor comprises a main shaft, a hub shell, a torque sensing assembly and a driving assembly, the hub shell comprises a hollow shell and an end cover arranged on one side of the shell in a covering mode, the end cover is fixedly connected with a connecting base, the connecting base is in transmission connection with the rotating output end of the driving assembly, the connecting base is connected with a ratchet wheel, and a torque arm is connected to the peripheral face of the ratchet wheel. The torque arm is arranged between the connecting seat and the end cover, the ultrathin intelligent barrel shaft motor further comprises a tower footing, a pawl is arranged on the peripheral surface of the tower footing, the ratchet wheel is in transmission connection with the tower footing through the pawl, an elastic deformation body is arranged in the middle of the torque arm, a strain gauge is attached to the elastic deformation body, and the strain gauge is electrically connected with the torque circuit board. The torque circuit board is electrically connected with the torque power supply board, and the torque power supply board is electrically connected with the controller. The structure of the torque sensing assembly can be simplified, and the precision of the torque sensing assembly can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycles, and in particular relates to an ultra-thin intelligent barrel shaft motor and an electric bicycle. Background Art

[0002] As people's environmental awareness increases, electric bicycles with high efficiency and energy saving are becoming more and more popular, and people have higher and higher requirements for the electric power experience of existing bicycles. Hub motors are a type of power mechanism that is widely used on electric bicycles. They usually include a drive motor as a power source, a main shaft, a reduction assembly, etc. Hub motors are usually installed on the rear wheel of an electric bicycle. The housing of the hub motor is fixedly connected to the steel rim of the rear wheel. The drive assembly drives the housing to rotate, thereby driving the rear wheel to rotate together.

[0003] However, the torque sensor of the hub motor used to detect the pedaling force in the prior art has a complex structure design and is inconvenient to install. If a failure occurs, it is also very troublesome to repair. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide an ultra-thin intelligent barrel axle motor and an electric bicycle, aiming to solve the problem of how to simplify the structure of the torque sensor component and how to improve the accuracy of the torque sensor component.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, an ultra-thin intelligent barrel shaft motor is provided, wherein the ultra-thin intelligent barrel shaft motor comprises a main shaft, a hub shell, a torque sensing assembly and a driving assembly, wherein the hub shell is rotatably mounted on the main shaft, the hub shell has a receiving cavity, the driving assembly is installed in the receiving cavity, the hub shell comprises a hollow outer shell and an end cover arranged on one side of the outer shell along the axial direction of the main shaft, the outer shell and the end cover together enclose the receiving cavity, the end cover is fixedly connected with a connecting seat, the connecting seat is drivingly connected to the rotating output end of the driving assembly, and the torque sensing assembly comprises a torque arm , a torque power supply board, a torque circuit board and a controller, the connecting seat is connected to a ratchet, the torque arm is connected to the outer circumference of the ratchet, the torque arm is arranged between the connecting seat and the end cover, the ultra-thin intelligent barrel shaft motor also includes a tower base, the outer circumference of the tower base is provided with a pawl, the ratchet is transmission-connected to the tower base through the pawl, an elastic deformation body is provided in the middle part of the torque arm, a strain gauge is attached to the elastic deformation body, the strain gauge is electrically connected to the torque circuit board, the torque circuit board is electrically connected to the torque power supply board, and the torque power supply board is electrically connected to the controller.

[0007] In some embodiments, the ultra-thin intelligent barrel shaft motor also includes a planetary gear reduction structure, which is connected to the output end of the drive assembly. The planetary gear reduction structure includes a first planetary bracket, a second planetary bracket, a plurality of first planetary wheels and a plurality of second planetary wheels. The first planetary bracket and the second planetary bracket can be rotatably mounted on the main shaft. The ultra-thin intelligent barrel shaft motor also includes an inner ring gear fixed on the main shaft, the first planetary wheel and the second planetary wheel are both meshed with the inner ring gear, and the end cover is fixedly connected to a connecting seat, and the second planetary bracket outputs rotational power to the connecting seat through a one-way device.

[0008] In some embodiments, the torque power supply board is fixed on the inner gear ring, and coils are provided at positions corresponding to the torque circuit board and the torque power supply board to achieve mutual transmission of electric energy and signals through coupling.

[0009] In some embodiments, a limiting hole is provided on the connecting seat, and the end of the torque arm abuts against the hole wall of the limiting hole.

[0010] In some embodiments, a through hole is opened in the middle of the elastic deformation body.

[0011] In some embodiments, the torque arm includes a main body and a bent portion extending from the end of the main body toward the ratchet, the strain gauge is attached to the side of the torque arm away from the ratchet, and the side surface of the bent portion abuts against the connecting seat.

[0012] In some embodiments, a first Hall sensor element is disposed on the torque circuit board, a magnet is disposed on the tower base, the first Hall sensor element is used to detect the rotation state of the magnet, and the first Hall sensor element is electrically connected to the controller.

[0013] In some embodiments, the drive assembly includes an inner rotor and an outer stator, and the drive assembly also includes a stator bracket fixed on the main shaft, the stator bracket is used to support the outer stator, the inner ring gear is fixedly connected to the stator bracket, the outer stator has a hollow cavity, the inner rotor is accommodated in the hollow cavity, the inner rotor is rotatably mounted on the main shaft, and the inner rotor is drivingly connected to the second planetary bracket.

[0014] In some embodiments, the planetary gear reduction structure also includes a first sun gear and a plurality of first planet struts, the first sun gear is connected to the inner rotor, the plurality of first planet gears are arranged around the first sun gear, the first planet strut is fixedly connected to the first planet carrier, the plurality of first planet gears are respectively mounted on the plurality of first planet struts, the first planet gear is meshed with the first sun gear, and the second planet carrier is transmission-connected to the first planet carrier.

[0015] In some embodiments, the planetary gear reduction structure also includes a second sun gear and a plurality of second planet struts, the second sun gear is fixedly connected to the first planet carrier, a plurality of second planet gears are arranged around the second sun gear, the second planet strut is fixedly connected to the second planet carrier, a plurality of second planet gears are respectively mounted on a plurality of second planet struts, and the second planet gear is meshed with the second sun gear.

[0016] In a second aspect, an electric bicycle is provided, which includes the above-mentioned ultra-thin intelligent barrel axle motor.

[0017] The ultra-thin intelligent barrel axle motor of the present application, when the rider pedals to drive, the tower base drives the ratchet to rotate through the pawl, the ratchet and the connecting seat can rotate relative to each other, and the torque arm connected to the ratchet drives the connecting seat and the hub shell to rotate, so the torque arm has a torque signal, which can be used as one of the conditions for starting the drive component. The torque sensing component of the present application has a simple and sophisticated structure and is easy to install. Even if a fault occurs, it is easy to repair, and the elastic deformable body ensures the accuracy of the strain gauge in measuring deformation, which can improve the accuracy of the torque sensing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the ultra-thin intelligent barrel shaft motor provided in an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of the cross-section structure of the ultra-thin intelligent barrel shaft motor provided in an embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of the split structure of the ultra-thin intelligent barrel shaft motor provided in the embodiment of the present application;

[0022] Figure 4This is a partial structural diagram of an ultra-thin intelligent barrel shaft motor provided in one of the embodiments of the present application;

[0023] Figure 5 It is a partial structural schematic diagram of an ultra-thin intelligent barrel axle motor provided in another embodiment of the present application.

[0024] Among them, the reference numerals in the figure are:

[0025] 10. Drive components;

[0026] 11. Inner rotor;

[0027] 12. External stator;

[0028] 13. Planetary gear reduction structure;

[0029] 131, first sun gear;

[0030] 132. First planetary gear;

[0031] 133. The First Planetary Pillar;

[0032] 134. First planetary support;

[0033] 141, second sun gear;

[0034] 142, second planetary gear;

[0035] 143. Second Planetary Pillar;

[0036] 144. Second planetary support;

[0037] 15. Internal gear ring;

[0038] 16. Stator bracket;

[0039] 20. Hub shell;

[0040] 21. Shell;

[0041] 22. End cap;

[0042] 30. Spindle;

[0043] 40. Connecting seat;

[0044] 41. Ratchet;

[0045] 51. Torque arm;

[0046] 511, through hole;

[0047] 512. Main body;

[0048] 513, bending portion;

[0049] 52. Torque power supply board;

[0050] 53. Torque circuit board;

[0051] 54. Strain gauge;

[0052] 61. Tower base;

[0053] 611, ratchet;

[0054] 62. Flywheel;

[0055] 70. Bearings;

[0056] 80. One-way device;

[0057] 90. A first Hall sensor element. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0062] See also Figures 1 to 5 The embodiment of the present application provides an ultra-thin intelligent barrel shaft motor, which includes a main shaft 30, a hub shell 20, a torque sensing assembly and a driving assembly 10. The hub shell 20 is rotatably mounted on the main shaft 30, and the hub shell 20 has a receiving cavity. The driving assembly 10 is installed in the receiving cavity. The hub shell 20 includes a hollow shell 21 and an end cover 22 that is covered on one side of the shell 21 along the axial direction of the main shaft 30. The shell 21 and the end cover 22 are together formed to form the receiving cavity. The end cover 22 is fixedly connected to a connecting seat 40, and the connecting seat 40 is drivingly connected to the rotating output end of the driving assembly 10. The torque sensing assembly includes a torque arm 5 1. A torque power supply board 52, a torque circuit board 53 and a controller. The connecting seat 40 is connected to a ratchet 41. The torque arm 51 is connected to the outer peripheral surface of the ratchet 41. The torque arm 51 is arranged between the connecting seat 40 and the end cover 22. The ultra-thin intelligent barrel shaft motor also includes a tower base 61. The outer peripheral surface of the tower base 61 is provided with a pawl 611. The ratchet 41 is transmission-connected to the tower base 61 through the pawl 611. An elastic deformation body is provided in the middle part of the torque arm 51. A strain gauge 54 is attached to the elastic deformation body. The strain gauge 54 is electrically connected to the torque circuit board 53. The torque circuit board 53 is electrically connected to the torque power supply board 52. The torque power supply board 52 is electrically connected to the controller.

[0063] It can be understood that when the ultra-thin intelligent barrel axle motor is installed on an electric bicycle, for example, installed on the rear wheel of the electric bicycle, spoke holes are evenly arranged on the periphery of the hub shell 20, and spokes are engaged in the spoke holes. The spokes engaged in the spoke holes are cross-woven and connected to the steel rim of the rear wheel, so that when the hub shell 20 rotates, the rear wheel can be driven to rotate together.

[0064] The ultra-thin intelligent barrel shaft motor provided by the present application, when the rider pedals to drive, the tower base 61 drives the ratchet 41 to rotate through the pawl 611, the ratchet 41 and the connecting seat 40 can rotate relative to each other, and the torque arm 51 connected to the ratchet 41 drives the connecting seat 40 and the hub shell 20 to rotate, so the torque arm 51 has a torque signal, which can be used as one of the conditions for starting the driving component. The torque sensing component of the present application has a simple and sophisticated structure and is easy to install. Even if a fault occurs, it is easy to repair, and the elastic deformable body ensures the accuracy of the strain gauge in measuring deformation, which can improve the accuracy of the torque sensing component.

[0065] In some embodiments, the ultra-thin smart barrel shaft motor also includes a planetary gear reduction structure 13, which is connected to the output end of the drive assembly 10. The planetary gear reduction structure 13 includes a first planetary bracket 134, a second planetary bracket 144, a plurality of first planetary gears 132 and a plurality of second planetary gears 142. The first planetary bracket 134 and the second planetary bracket 144 can be rotatably mounted on the main shaft 30. The ultra-thin smart barrel shaft motor also includes an inner ring gear 15 fixed on the main shaft 30. The first planetary gear 132 and the second planetary gear 142 are both engaged with the inner ring gear 15. The end cover 22 is fixedly connected to the connecting seat 40. The second planetary bracket 144 outputs the rotational power to the connecting seat 40 through the one-way device 80. The end cover 22 can also rotate with the connecting seat 40, so the entire hub shell 20 can also rotate together. The ultra-thin smart barrel shaft motor of the present application has a small overall volume, a compact structure, a large output torque, and a working mode that adapts to the transmission control requirements of large speed ratio reduction, which is conducive to miniaturization.

[0066] Specifically, the connection base 40 and the end cover 22 can be fixed by fixing screws. In addition, since a check valve 80 is provided between the second planetary support 144 and the connection base 40, the second planetary support 144 and the connection base 40 are connected in a one-way manner, so the second planetary support 144 can drive the connection base 40 to rotate, and when the driving assembly 10 is not working, the rotation of the connection base 40 will not drive the second planetary support 144 to rotate.

[0067] In some embodiments, the drive assembly 10 includes an inner rotor 11 and an outer stator 12. The drive assembly 10 also includes a stator bracket 16 fixed on the main shaft 30. The stator bracket 16 is used to support the outer stator 12. The inner gear ring 15 is fixedly connected to the stator bracket 16. The outer stator 12 has a hollow cavity. The inner rotor 11 is accommodated in the hollow cavity. The inner rotor 11 is rotatably sleeved on the main shaft 30. The inner rotor 11 is transmission-connected to the second planetary bracket 144. The planetary gear reduction structure 13 can reduce the rotation speed and increase the torque, thereby improving the stability and reliability of the ultra-thin intelligent barrel shaft motor. The planetary gear reduction structure 13 is used for deceleration, which can make the structure of the ultra-thin intelligent barrel shaft motor more compact and the transmission stable. It should also be noted that the main shaft 30 of the present application is a hollow structure, with a hollow cavity in the main shaft 30, and a bearing 70 can be sleeved on the main shaft 30.

[0068] Specifically, the torque power supply board 52 is fixed on the inner gear ring 15, and coils are provided at positions corresponding to the torque circuit board 53 and the torque power supply board 52 to achieve mutual transmission of electric energy and signals through coupling.

[0069] In addition, in one embodiment of the present application, a limiting hole is provided on the connecting seat 40, and the position of the limiting hole corresponds to the torque arm 51. The end of the torque arm 51 abuts against the hole wall of the limiting hole. The limiting hole can limit the torque arm 51, thereby making the working state of the torque arm 51 more stable.

[0070] In some embodiments, a through hole 511 is provided in the middle of the elastic deformation body. Due to the through hole 511, the elastic deformation body is sensitive to torsion deformation under the premise of ensuring the strength of the torque arm 51. The deformation of the elastic deformation body under torsion is collected by the strain gauge 54 and transmitted to the torque circuit board 53. This structure is simple and exquisite, easy to install, and easy to repair even if a fault occurs. Specifically, there are two through holes 511 on the elastic deformation body, and the two through holes 511 are connected to each other.

[0071] In another embodiment of the present application, Figure 5 As shown, the torque arm 51 includes a main body 512 and a bent portion 513 extending from the end of the main body 512 toward the ratchet 41. The strain gauge 54 is attached to the side of the torque arm 51 away from the ratchet 41, and the side of the bent portion 513 abuts against the connecting seat 40. This arrangement makes the sensor have good linearity and high measurement accuracy.

[0072] In some embodiments, a first Hall sensor element 90 is disposed on the torque circuit board 53, and a magnet is disposed on the tower base 61. The first Hall sensor element 90 is used to detect the rotation state of the magnet. The first Hall sensor element 90 is electrically connected to the controller. Since the magnet is installed on the tower base 61, the magnet can rotate with the tower base 61. Therefore, the first Hall sensor element 90 can detect the relative movement state between the tower base 61 and the hub shell 20. If the tower base 61 and the hub shell 20 slide relative to each other, the first Hall sensor element 90 transmits a signal to the controller, and the controller controls the drive assembly 10 to stop output.

[0073] The ultra-thin smart barrel shaft motor also includes a flywheel 62, a tower base 61 rotatably mounted on the main shaft 30, and the flywheel 62 is installed on the tower base 61. In the electric mode of the bicycle, the ultra-thin smart barrel shaft motor is powered on and the inner rotor 11 therein drives the hub shell 20 to rotate through the second planetary bracket 144, thereby driving the bicycle wheel to rotate and the entire vehicle moves forward. In the pedaling mode of the bicycle, the rider steps on the pedals of the bicycle to drive the flywheel 62 to rotate through the chain, and the flywheel 62 drives the tower base 61 to rotate synchronously. At this time, the pawl 611 on the tower base 61 and the ratchet 41 are in a locked state, so that the tower base 61 drives the ratchet 41 to rotate through the pawl 611 set thereon, and then drives the hub shell 20 to rotate through the ratchet 41, so that the whole moves forward.

[0074] In some embodiments, the planetary gear reduction structure 13 includes a first sun gear 131 and a plurality of first planet struts 133. The first sun gear 131 is connected to the inner rotor 11. The plurality of first planet gears 132 are arranged around the first sun gear 131. The first planet struts 133 are fixedly connected to the first planet bracket 134. The plurality of first planet gears 132 are respectively sleeved on the plurality of first planet struts 133. The first planet gear 132 is meshed with the first sun gear 131. The second planet bracket 144 is transmission-connected to the first planet bracket 134.

[0075] Optionally, the number of the first planetary gears 132 is three, and correspondingly, the number of the first planetary struts 133 is also three. The three first planetary struts 133 are evenly loaded during operation, making the transmission smoother and being able to improve the damage resistance of the planetary gear reduction structure 13, thereby greatly improving the output performance and service life of the ultra-thin intelligent barrel axle motor.

[0076] In some embodiments, the planetary gear reduction structure 13 also includes a second sun gear 141 and a plurality of second planetary struts 143, the second sun gear 141 is fixedly connected to the first planetary support 134, a plurality of second planetary gears 142 are arranged around the second sun gear 141, the second planetary struts 143 are fixedly connected to the second planetary support 144, a plurality of second planetary gears 142 are respectively sleeved on a plurality of second planetary struts 143, and the second planetary gears 142 are meshed with the second sun gear 141, that is, the present application adopts a two-stage reduction, so the output torque can be further increased by reduction. The planetary gear reduction structure 13 of the present application can be set with more stages according to the actual application needs, and is not limited here.

[0077] The working principle of the ultra-thin intelligent barrel shaft motor of the present application is as follows: the flywheel 62 drives the tower base 61 to rotate, and the tower base 61 drives the ratchet 41 to rotate through the pawl 611. The ratchet 41 and the connecting seat 40 can rotate relative to each other. The torque arm 51 connected to the ratchet 41 drives the connecting seat 40 and the hub shell 20 to rotate. The connecting seat 40 has a first Hall sensor element 90, and the corresponding tower base 61 position has a magnet. At this time, the one-way device 80 between the connecting seat 40 and the second planetary bracket 144 is disengaged, and the rotation of the wheel hub does not drive the second planetary bracket 144 to rotate. There is a magnet on the wheel hub, and a second Hall sensor element is provided on the corresponding stator bracket 16, and the second Hall sensor element is electrically connected to the controller. When the rider pedals, the torque arm 51 is driven by force to drive the hub shell 20 to rotate, so the torque arm 51 has a torque signal, and the second Hall sensor element also has a rotation signal. However, at this time, since the freehub 61 and the ratchet 41 are in meshing and rotating at the same speed, the freehub 61 and the ratchet 41 are relatively stationary, so the first Hall sensor element 90 has no rotation signal, and the driving assembly 10 starts to assist. When the rider stops pedaling and glides, the freehub 61 and the ratchet 41 are disengaged from relative rotation, the first Hall sensor element 90 has a rotation signal, and the driving assembly 10 stops, and the one-way device 80 between the connecting seat 40 and the second planetary bracket 144 is disengaged, and there is no resistance to gliding at this time.

[0078] That is to say, the start-up of the drive component 10 needs to meet three starting conditions: the torque arm 51 has a torque signal, the second Hall sensor element has a speed signal, and the first Hall sensor element 90 has no speed signal. If all three conditions are met at the same time, the drive component 10 starts to assist, and if any one of the conditions is not met, the assist will stop.

[0079] The utility model also proposes an electric bicycle, which includes an ultra-thin intelligent barrel-axle motor. The specific structure of the ultra-thin intelligent barrel-axle motor refers to the above-mentioned embodiment. Since the electric bicycle adopts all the technical solutions of all the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0080] To summarize, the ultra-thin intelligent barrel shaft motor provided by the present application, when the rider pedals to drive, the tower base 61 drives the ratchet 41 to rotate through the pawl 611, the ratchet 41 and the connecting seat 40 can rotate relative to each other, and the torque arm 51 connected to the ratchet 41 drives the connecting seat 40 and the hub shell 20 to rotate, so the torque arm 51 has a torque signal, which can be used as one of the conditions for starting the driving component. The torque sensing component of the present application has a simple and sophisticated structure and is easy to install. Even if a fault occurs, it is easy to repair, and the elastic deformation body ensures the accuracy of the strain gauge in measuring deformation, which can improve the accuracy of the torque sensing component.

[0081] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An ultra-thin intelligent barrel shaft motor, characterized in that: The ultra-thin intelligent barrel shaft motor comprises a main shaft (30), a wheel hub shell (20), a torque sensing assembly and a driving assembly (10), wherein the wheel hub shell (20) is rotatably mounted on the main shaft (30), the wheel hub shell (20) has a receiving cavity, the driving assembly (10) is installed in the receiving cavity, the wheel hub shell (20) comprises a hollow outer shell (21) and an end cover (22) which is arranged on one side of the outer shell (21) along the axial direction of the main shaft (30), the outer shell (21) and the end cover (22) together enclose the receiving cavity, the end cover (22) is fixedly connected with a connecting seat (40), the connecting seat (40) is drivingly connected to the rotating output end of the driving assembly (10), the torque sensing assembly comprises a torque arm (51), a torque power supply board (52), and a torque circuit board (53) and a controller, the connecting seat (40) is connected to a ratchet (41), the torque arm (51) is connected to the outer peripheral surface of the ratchet (41), the torque arm (51) is arranged between the connecting seat (40) and the end cover (22), the ultra-thin intelligent barrel shaft motor also includes a tower base (61), the outer peripheral surface of the tower base (61) is provided with a pawl (611), the ratchet (41) is connected to the tower base (61) through the pawl (611), the torque arm (51) is provided with an elastic deformation body in the middle part, a strain gauge (54) is attached to the elastic deformation body, the strain gauge (54) is electrically connected to the torque circuit board (53), the torque circuit board (53) is electrically connected to the torque power supply board (52), and the torque power supply board (52) is electrically connected to the controller.

2. The ultra-thin intelligent barrel shaft motor according to claim 1, characterized in that: The ultra-thin intelligent barrel shaft motor also includes a planetary gear reduction structure (13), which is connected to the output end of the drive assembly (10). The planetary gear reduction structure (13) includes a first planetary bracket (134), a second planetary bracket (144), a plurality of first planetary wheels (132) and a plurality of second planetary wheels (142). The first planetary bracket (134) and the second planetary bracket (144) are both rotatably mounted on the main shaft (30). The ultra-thin intelligent barrel shaft motor also includes an inner gear ring (15) fixed on the main shaft (30). The first planetary wheel (132) and the second planetary wheel (142) are both meshed with the inner gear ring (15). The second planetary bracket (144) outputs the rotational power to the connecting seat (40) through a one-way device (80).

3. The ultra-thin intelligent barrel shaft motor according to claim 2, characterized in that: The torque power supply board (52) is fixed on the inner gear ring (15), and coils are provided at positions corresponding to the torque circuit board (53) and the torque power supply board (52) to achieve mutual transmission of electric energy and signals through coupling.

4. The ultra-thin intelligent barrel shaft motor according to claim 2, characterized in that: The connection seat (40) is provided with a limiting hole, and the end of the torque arm (51) abuts against the hole wall of the limiting hole.

5. The ultra-thin intelligent barrel shaft motor according to claim 4, characterized in that: A through hole (511) is provided in the middle of the elastic deformation body.

6. The ultra-thin intelligent barrel shaft motor according to claim 2, characterized in that: The torque arm (51) comprises a main body (512) and a bent portion (513) bent and extended from the end of the main body (512) toward the ratchet (41), the strain gauge (54) is attached to a side of the torque arm (51) away from the ratchet (41), and a side surface of the bent portion (513) abuts against the connecting seat (40).

7. The ultra-thin intelligent barrel shaft motor according to claim 2, characterized in that: The drive assembly (10) comprises an inner rotor (11) and an outer stator (12). The drive assembly (10) further comprises a stator bracket (16) fixed on the main shaft (30), the stator bracket (16) being used to support the outer stator (12), the inner gear ring (15) being fixedly connected to the stator bracket (16), the outer stator (12) having a hollow cavity, the inner rotor (11) being accommodated in the hollow cavity, the inner rotor (11) being rotatably sleeved on the main shaft (30), and the inner rotor (11) being drivingly connected to the second planetary bracket (144).

8. The ultra-thin intelligent barrel shaft motor according to claim 7, characterized in that: A first Hall sensor element (90) is arranged on the torque circuit board (53), a magnet is arranged on the tower base (61), the first Hall sensor element (90) is used to detect the rotation state of the magnet, the first Hall sensor element (90) is electrically connected to the controller, a magnet is arranged on the wheel hub shell (20), a second Hall sensor element is arranged on the stator bracket (16), the second Hall sensor element is used to detect the rotation state of the magnet on the wheel hub shell (20), and the second Hall sensor element is electrically connected to the controller.

9. The ultra-thin intelligent barrel shaft motor according to claim 8, characterized in that: The planetary gear reduction structure (13) also includes a first sun gear (131) and a plurality of first planet struts (133), wherein the first sun gear (131) is connected to the inner rotor (11), a plurality of first planet gears (132) are arranged around the first sun gear (131), the first planet strut (133) is fixedly connected to the first planet support (134), the plurality of first planet gears (132) are respectively sleeved on the plurality of first planet struts (133), the first planet gear (132) is meshed with the first sun gear (131), and the second planet support (144) is transmission-connected to the first planet support (134).

10. The ultra-thin intelligent barrel shaft motor according to claim 9, characterized in that: The planetary gear reduction structure (13) also includes a second sun gear (141) and a plurality of second planet struts (143); the second sun gear (141) is fixedly connected to the first planet support (134); a plurality of second planet gears (142) are arranged around the second sun gear (141); the second planet struts (143) are fixedly connected to the second planet support (144); a plurality of second planet gears (142) are respectively sleeved on a plurality of second planet struts (143); and the second planet gears (142) are meshed with the second sun gear (141).

11. An electric bicycle, characterized in that: Comprising an ultra-thin intelligent barrel axle motor as described in any one of claims 1 to 10.

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