CN111452903A

CN111452903A - Coaxial type middle-placed motor

Info

Publication number: CN111452903A
Application number: CN202010367677.4A
Authority: CN
Inventors: 倪捷; 陈文胜; 吴启皇; 徐嘉伟; 周进宏; 王宇峰
Original assignee: Zhejiang Luyuan Electric Vehicle Co Ltd
Current assignee: Zhejiang Luyuan Electric Vehicle Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-07-28
Also published as: WO2021217757A1

Abstract

The invention discloses a coaxial type mid-set motor which comprises a shell, a middle shaft, a stator assembly, a rotor assembly, a speed changing module and a clutch module, wherein the stator assembly, the rotor assembly, the speed changing module and the clutch module are positioned in the shell, the stator assembly is sleeved in the rotor assembly and connected to the shell, the middle shaft penetrates through the stator assembly, the rotor assembly, the speed changing module and the clutch module, the speed changing module is connected with the rotor assembly, the clutch module is respectively connected with the middle shaft and the speed changing module, and the middle shaft penetrates through the shell and extends out of the shell. Through the design, the axes of the stator assembly, the rotor assembly, the speed change module and the center shaft are overlapped, the whole transmission process is simple, the mechanical loss in the power output and transmission process is small, and the abrasion is not easy to cause. The noise is little when the motor operates, is favorable to prolonging the life of motor.

Description

Coaxial type middle-placed motor

Technical Field

The invention relates to a coaxial type middle-mounted motor, in particular to a coaxial type middle-mounted motor.

Background

In the electric power-assisted bicycle field, the middle motor is a motor which is arranged at the middle position of a bicycle body, namely a pedal position, of a driving motor of the electric power-assisted bicycle, the motor is connected with the bicycle body and is connected with a rear wheel through a chain to transmit power, pedals are arranged on two sides of the motor, a rider can ride the bicycle through the pedal manpower, and the rider can also select the mode that the motor is matched with the manpower to ride the bicycle. The axle center of the transmission shaft of the middle motor and the transmission shaft of the pedal crank in the existing market is not coincident, and the power output transmission process has larger mechanical loss. The transmission process of the rotor assembly of the motor and the gear speed change mechanism is complex, abrasion is easily caused, the noise is high when the motor runs, the service life of the motor is influenced, and therefore improvement is needed.

Disclosure of Invention

The invention provides a novel coaxial type mid-set motor aiming at the defects that the axle centers of a transmission shaft of a mid-set motor and a transmission shaft of a pedal crank are not coincident, the transmission process of a rotor assembly of the motor and a gear speed change mechanism is complex, abrasion is easy to cause, the noise is high during the operation of the motor, the service life of the motor is influenced and the like in the prior art.

In order to solve the technical problems, the invention is realized by the following technical scheme:

a coaxial type middle motor comprises a shell, a middle shaft, a stator assembly, a rotor assembly, a speed change module and a clutch module, wherein the stator assembly, the rotor assembly, the speed change module and the clutch module are located inside the shell, the stator assembly is sleeved inside the rotor assembly and connected to the shell, the middle shaft penetrates through the stator assembly, the rotor assembly, the speed change module and the clutch module, the speed change module is connected with the rotor assembly, the clutch module is respectively connected with the middle shaft and the speed change module, and the middle shaft penetrates through the shell and extends out of the shell.

The casing provides support location and protection for parts such as stator module, rotor subassembly, makes its installation location reliable, avoids external force to damage. When the stator assembly is electrified, the driving torque can be generated through the law of electromagnetic induction, so that the rotor assembly rotates relative to the stator assembly. In the invention, the middle shaft simultaneously penetrates through the stator assembly, the rotor assembly, the speed change module and the clutch module, so that the stator assembly and the rotor assembly can directly provide power for the speed change module. The clutch module is respectively connected with the middle shaft and the speed change module, on one hand, the speed change module can directly drive the clutch module and an external connecting part thereof so as to output power to the outside of the motor, and on the other hand, a user can also drive the middle shaft to rotate through the external connecting part of the middle shaft so as to directly drive the clutch module and the external connecting part thereof to realize power output.

Through the design, the axes of the stator assembly, the rotor assembly, the speed change module and the center shaft are overlapped, the whole transmission process is simple, the mechanical loss in the power output and transmission process is small, and the abrasion is not easy to cause. The noise is little when the motor operates, is favorable to prolonging the life of motor.

Preferably, in the coaxial mid-motor, a middle partition plate is disposed in the casing, the middle partition plate divides the inside of the casing into a first cavity and a second cavity, the middle shaft penetrates through the middle partition plate, the speed changing module penetrates through the middle partition plate and is connected with the rotor assembly, the stator assembly and the rotor assembly are disposed in the first cavity, and the speed changing module and the clutch module are disposed in the second cavity.

The stator assembly and the rotor assembly are arranged in the first cavity, and the speed change module is arranged in the second cavity, so that the stator assembly and the rotor assembly are not easily influenced with each other, and the stability and the reliability of the invention are further improved.

Preferably, the speed change module of the coaxial mid-motor comprises a sun gear and a planetary reduction mechanism, the planetary reduction mechanism is connected with the clutch module, the sun gear is sleeved between the middle shaft and the middle partition plate, one end of the sun gear is connected with the rotor assembly, and the other end of the sun gear is meshed with the planetary reduction mechanism.

The sun wheel is sleeved outside the middle shaft and is directly connected with the rotor assembly, so that the problem of radial runout caused by the fact that the rotor assembly and the sun wheel are not coaxial can be further effectively solved, the stability of the running state of the rotor assembly is improved, gear abrasion and motor noise are reduced, the service life of the motor is prolonged, the planetary speed reducing mechanism can achieve the speed reducing effect, and the planetary speed reducing mechanism has the advantages of being stable in running, low in noise and high in torque.

Preferably, the planetary reduction mechanism includes a planetary carrier, a planetary wheel, and an inner gear ring, the planetary wheel is disposed on the planetary carrier, the planetary wheel is engaged with the sun wheel and the inner gear ring, the inner gear ring is connected to the housing, and the planetary carrier is connected to the clutch module.

The planet support provides a mounting position for the planet wheel, the planet wheel is used for being meshed with the sun wheel and the inner gear ring, the planet wheel is driven by the sun wheel to rotate, and the planet support is driven by the rotation of the planet wheel to rotate relative to the inner gear ring, so that the clutch module is driven to realize power output. The inner gear ring is fixed on the machine shell, so that the whole power transmission process can be ensured to be more stable.

Preferably, in the above coaxial centrally mounted motor, the planet carrier is connected to the sun gear through a bearing.

The planet carrier is connected to the sun gear through the bearing, so that the planet carrier can smoothly rotate, and the rotating process of the planet carrier is more stable.

Preferably, in the above coaxial centrally mounted motor, the planet carrier is connected to the middle partition plate through a bearing.

The planet carrier is connected to the middle partition plate through the bearing, so that the planet carrier can smoothly rotate, and the rotating process of the planet carrier is more stable.

Preferably, in the coaxial mid-motor, a rotor through hole is formed in the middle of the rotor assembly, and a first bend is formed in the sun gear at a position corresponding to the rotor through hole, and the first bend penetrates through the rotor through hole and is matched with the rotor through hole.

The design of first buckling can realize quick accurate location at the fixed in-process of installation of rotor subassembly and sun gear, simplifies the installation step.

Preferably, in the coaxial mid-motor, a stator groove is formed in a position of the stator assembly corresponding to the first bend, and the stator groove is adapted to the first bend.

The stator groove can partially accommodate the sun wheel, and the axial installation space of the sun wheel is saved.

Preferably, in the coaxial mid-motor, a mid-diaphragm through hole is formed in the middle of the mid-diaphragm, and a second bend is formed in the sun gear at a position corresponding to the mid-diaphragm through hole, and the second bend penetrates through the mid-diaphragm through hole and is matched with the mid-diaphragm through hole.

The design of second buckling can make sun gear and median septum through-hole realize quick location at the installation in-process, simplifies the installation procedure.

Preferably, the coaxial mid-motor further comprises a sun wheel supporting bearing, and the sun wheel supporting bearing is sleeved between the middle shaft and the sun wheel.

The sun wheel supporting bearing is sleeved between the middle shaft and the sun wheel, so that the rotation process of the sun wheel is smoother and more stable.

Preferably, in the coaxial mid-motor, the sun gear is provided with a semi-closed bearing accommodating groove, and the bearing accommodating groove is matched with the sun gear support bearing and accommodates the sun gear support bearing.

The semi-closed bearing accommodating groove is used for accommodating and protecting the sun gear supporting bearing, provides a relatively stable working environment for the sun gear supporting bearing, can also realize the detachable connection of the sun gear supporting bearing and the sun gear, and is convenient to install and detach.

Preferably, the coaxial centrally-mounted motor further comprises a sun gear pressing plate, the sun gear pressing plate is detachably connected with the bearing accommodating groove, and the sun gear pressing plate is abutted to the sun gear supporting bearing.

The sun gear pressing plate further fixes the sun gear supporting shaft, so that the sun gear supporting shaft is prevented from being displaced due to external force factors such as bumping and the like.

Preferably, the coaxial mid-motor further comprises a connecting piece, the rotor assembly is provided with a rotor connecting hole at the periphery of the rotor through hole, the first bend is provided with a sun gear connecting hole at a position corresponding to the rotor connecting hole, the sun gear pressing plate is provided with a pressing plate connecting hole at a position corresponding to the rotor connecting hole, and the connecting piece penetrates through the rotor connecting hole, the sun gear connecting hole and the pressing plate connecting hole.

The connecting piece simultaneously penetrates through the rotor connecting hole, the sun wheel connecting hole and the pressing plate connecting hole, the rotor assembly, the sun wheel and the sun wheel pressing plate are fixed, the design space is saved, and the structure of the solar rotor assembly is more compact.

Preferably, the coaxial mid-motor further comprises a sprocket support, and the sprocket support is connected with the clutch module.

When the clutch module is used, the chain wheel support can be externally connected with a chain wheel, and the chain wheel support drives the externally connected chain wheel to rotate together under the driving of the clutch module, so that the power output of the motor is realized.

Preferably, the coaxial centrally-mounted motor further comprises a pedal crank, and the pedal crank is connected with a part of the middle shaft extending out of the casing.

The pedal crank connected with the middle shaft can drive the middle shaft to rotate under the action of human power, and then the middle shaft drives the clutch module to realize the manual power output.

Preferably, the coaxial mid-motor is provided with a positioning shaft on the planet carrier, the clutch module is provided with a positioning connecting piece, the positioning shaft is matched with the positioning connecting piece, the planet carrier is connected with the clutch module through the positioning shaft and the positioning connecting piece, and the planet wheel is sleeved outside the positioning shaft.

The design of the positioning shaft and the positioning connecting piece can realize the quick installation and fixation of the planet support and the clutch module, and the power of the planet support is transmitted to the clutch module.

Preferably, in the coaxial mid-motor, a first boss is disposed on an outer side of the planet carrier, a second boss is disposed on an outer side of the clutch module, the positioning shaft is disposed on the first boss, and the positioning connecting member is disposed on the second boss.

The first boss and the second boss respectively provide installation space for the positioning shaft and the positioning connecting piece, so that the space layout of the positioning shaft is more reasonable.

Preferably, the clutch module includes a clutch outer ring, a clutch middle gear ring, and a clutch inner shaft sleeve, which are sequentially sleeved from outside to inside, the clutch inner shaft sleeve is sleeved outside the middle shaft and connected to the middle shaft spline, the clutch middle gear ring is connected to the sprocket support, and the second boss is disposed on the clutch outer ring.

The clutch module adopts the double-clutch structure to realize double-clutch power synthesis output, the structure enables the motor driving force and the pedal force of a person to be perfectly combined, the structural complexity of the motor is reduced, and the cost is saved.

Preferably, the coaxial centrally-mounted motor further includes an insulating cooling liquid, and the insulating cooling liquid is located in the first cavity.

The insulating cooling liquid that is located first cavity is the mobile state, along with the rotation of rotor subassembly flows in the casing is inside, and the heat exchange takes place with each part that generates heat in abundant contact, and to a great extent has improved the radiating efficiency.

Preferably, the coaxial centrally-mounted motor further comprises gear lubricating oil, and the gear lubricating oil is located in the second cavity.

Gear lubricating oil cools the speed changing module while lubricating the speed changing module, effectively reduces mechanical friction heating generated by gear meshing, reduces abrasion on the surfaces of gear teeth of the gears, and prolongs the service life of the gears.

Preferably, the coaxial mid-motor further comprises a sun gear oil seal, and the sun gear oil seal is sleeved between the middle shaft and the sun gear.

The sun gear oil seal sleeved between the central shaft and the sun gear plays a role in blocking oil, and oil in the first cavity and the second cavity is prevented from permeating.

Preferably, the coaxial mid-motor further comprises a middle partition plate oil seal, and the middle partition plate oil seal is sleeved between the second bend and the middle partition plate through hole.

The middle partition plate oil seal sleeved between the second bend and the middle partition plate through hole plays a role in blocking oil, and oil in the first cavity and oil in the second cavity are prevented from mutually permeating.

Preferably, the coaxial mid-motor further comprises a first oil-proof vent valve, an oil-proof vent film is arranged in the first oil-proof vent valve, a first vent hole which is communicated with the first cavity is formed in the first cavity, and the first oil-proof vent valve is matched with the first vent hole and seals the first vent hole.

The design of first grease proofing breather valve can guarantee that the inside and outside atmospheric pressure of the first cavity of motor during operation is balanced, reduces because of the inside temperature rise of motor or reduce the inside and outside pressure difference of motor that arouses, protects the motor, extension motor life.

Preferably, the coaxial mid-motor further comprises a second oil-proof vent valve, an oil-proof vent film is arranged in the second oil-proof vent valve, a through second vent hole is formed in the second cavity, and the second oil-proof vent valve is matched with the second vent hole and seals the second vent hole.

The design of the second oil-proof ventilation valve can ensure that the internal and external air pressure of the second cavity is balanced when the motor works, reduce the internal and external pressure difference of the motor caused by the rise or the reduction of the internal temperature of the motor, protect the motor and prolong the service life of the motor.

Drawings

FIG. 1 is a schematic diagram of the structure of the components in the first chamber of the present invention;

FIG. 2 is a schematic diagram of the components within the second chamber of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a partial enlarged view of portion A of FIG. 3;

FIG. 5 is an exploded view of the transmission module and clutch module of the present invention;

FIG. 6 is an exploded view of the present invention;

FIG. 7 is a schematic view of the interior of the first chamber of the present invention;

FIG. 8 is a schematic view of the interior of a second chamber according to the present invention;

fig. 9 is a schematic structural view after the present invention is mounted to a vehicle frame.

Detailed Description

The invention will be described in further detail below with reference to the accompanying figures 1-9 and the detailed description, but they are not intended to limit the invention:

example 1

A coaxial type mid-motor comprises a casing 1, a middle shaft 4, a stator assembly 3, a rotor assembly 2, a speed changing module 5 and a clutch module 6, wherein the stator assembly 3, the rotor assembly 2, the speed changing module 5 and the clutch module 6 are located inside the casing 1, the stator assembly 3 is sleeved inside the rotor assembly 2 and connected to the casing 1, the middle shaft 4 penetrates through the stator assembly 3, the rotor assembly 2, the speed changing module 5 and the clutch module 6, the speed changing module 5 is connected with the rotor assembly 2, the clutch module 6 is respectively connected with the middle shaft 4 and the speed changing module 5, and the middle shaft 4 penetrates through the casing 1 and extends out of the casing 1.

When the motor is powered on to work, the stator assembly 3 is powered on, the rotor assembly 2 and the stator assembly 3 directly generate Lorentz force, and the rotor assembly 2 rotates around the stator assembly 3. The rotor assembly 2 drives the speed changing module 5 to rotate, the power of the rotor assembly 2 is transmitted to the clutch module 6 through the speed changing module 5 so as to drive the clutch module 6 to rotate, and finally the clutch module 6 outputs the power of the motor through an external power output component.

When the manual driving is adopted, an external power component of the middle shaft 4 drives the middle shaft 4 to rotate, the middle shaft 4 drives the clutch module 6 to work, and finally, the clutch module 6 outputs manual power through an external power output component.

Preferably, a middle partition plate 13 is disposed in the casing 1, the middle partition plate 13 divides the inside of the casing 1 into a first cavity 11 and a second cavity 12, the middle shaft 4 passes through the middle partition plate 13, the speed changing module 5 passes through the middle partition plate 13 to be connected with the rotor assembly 2, the stator assembly 3 and the rotor assembly 2 are disposed in the first cavity 11, and the speed changing module 5 and the clutch module 6 are disposed in the second cavity 12.

Preferably, the speed changing module 5 includes a sun gear 51 and a planetary reduction mechanism 52, the planetary reduction mechanism 52 is connected to the clutch module 6, the sun gear 51 is sleeved between the middle shaft 4 and the middle partition plate 13, one end of the sun gear 51 is connected to the rotor assembly 2, and the other end of the sun gear 51 is engaged with the planetary reduction mechanism 52.

Preferably, the planetary reduction mechanism 52 includes a planetary carrier 521, a planetary gear 523 and an inner gear 522, the planetary gear 523 is disposed on the planetary carrier 521, the planetary gear 523 is engaged with the sun gear 51 and the inner gear 522, the inner gear 522 is connected to the housing 1, and the planetary carrier 521 is connected to the clutch module 6.

Preferably, the planet carrier 521 is coupled to the sun gear 51 by a bearing.

Preferably, the planet carrier 521 is coupled to the middle partition 13 through a bearing.

Preferably, a rotor through hole 21 is formed in the middle of the rotor assembly 2, and a first bend 511 is formed in the sun gear 51 at a position corresponding to the rotor through hole 21, wherein the first bend 511 passes through the rotor through hole 21 and is matched with the rotor through hole 21.

Preferably, the stator assembly 3 is provided with a stator groove 31 at a position corresponding to the first bend 511, and the stator groove 31 is adapted to the first bend 511.

Preferably, a middle partition through hole 131 is formed in the middle of the middle partition 13, a second bend 512 is formed in the position of the sun gear 51 corresponding to the middle partition through hole 131, and the second bend 512 penetrates through the middle partition through hole 131 and is matched with the middle partition through hole 131.

Preferably, the sun gear support device further comprises a sun gear support bearing 513, and the sun gear support bearing 513 is sleeved between the middle shaft 4 and the sun gear 51.

Preferably, the sun gear 51 is provided with a semi-closed bearing receiving groove 514, and the bearing receiving groove 514 is fitted to the sun gear support bearing 513 and receives the sun gear support bearing 513.

Preferably, the solar cell further comprises a sun gear pressing plate 515, the sun gear pressing plate 515 is detachably connected with the bearing accommodating groove 514, and the sun gear pressing plate 515 is abutted to the sun gear supporting bearing 513.

Preferably, the rotor assembly 2 further includes a connecting member 9, the rotor assembly 2 is provided with a rotor connecting hole 22 at a periphery of the rotor through hole 21, the first bend 511 is provided with a sun gear connecting hole 516 at a position corresponding to the rotor connecting hole 22, the sun gear pressing plate 515 is provided with a pressing plate connecting hole 517 at a position corresponding to the rotor connecting hole 22, and the connecting member 9 passes through the rotor connecting hole 22, the sun gear connecting hole 516 and the pressing plate connecting hole 517.

Preferably, the clutch device further comprises a sprocket support 7, and the sprocket support 7 is connected with the clutch module 6.

Preferably, the device further comprises a pedal crank 8, and the pedal crank 8 is connected with a part of the middle shaft 4 extending out of the machine shell 1.

Preferably, a positioning shaft 524 is disposed on the planet carrier 521, the clutch module 6 is provided with a positioning connecting piece 611, the positioning shaft 524 is adapted to the positioning connecting piece 611, the planet carrier 521 is connected to the clutch module 6 through the positioning shaft 524 and the positioning connecting piece 611, and the planet wheel 523 is sleeved outside the positioning shaft 524.

Preferably, a first boss 525 is disposed on the outer side of the planet carrier 521, a second boss 612 is disposed on the outer side of the clutch module 6, the positioning shaft 524 is disposed on the first boss 525, and the positioning connector 611 is disposed on the second boss 612.

Preferably, the clutch module 6 includes a clutch outer ring 61, a clutch middle gear ring 62, and a clutch inner shaft sleeve 63, which are sequentially sleeved from outside to inside, the clutch inner shaft sleeve 63 is sleeved outside the middle shaft 4 and is in splined connection with the middle shaft 4, the clutch middle gear ring 62 is connected with the sprocket support 7, and the second boss 612 is disposed on the clutch outer ring 61.

Preferably, the cooling device further comprises an insulating cooling liquid 14, and the insulating cooling liquid 14 is located in the first cavity 11.

Preferably, the gear lubricating oil device further comprises gear lubricating oil 15, and the gear lubricating oil 15 is located in the second cavity 12.

Preferably, the sun gear oil seal 518 is further included, and the sun gear oil seal 518 is sleeved between the middle shaft 4 and the sun gear 51.

Preferably, the baffle plate oil seal 132 is further included, and the baffle plate oil seal 132 is sleeved between the second bend 512 and the through hole 131 of the baffle plate.

Preferably, the oil-proof air-permeable structure further comprises a first oil-proof air-permeable valve 111, an oil-proof air-permeable membrane is arranged in the first oil-proof air-permeable valve 111, a first air-permeable hole 112 which penetrates through the first cavity 11 is arranged in the first cavity, and the first oil-proof air-permeable valve 111 is matched with the first air-permeable hole 112 and seals the first air-permeable hole 112.

Preferably, the oil-proof ventilation device further comprises a second oil-proof ventilation valve 121, an oil-proof ventilation film is arranged in the second oil-proof ventilation valve 121, a through second ventilation hole 122 is formed in the second cavity 12, and the second oil-proof ventilation valve 121 is matched with the second ventilation hole 122 and seals the second ventilation hole 122.

When the bicycle is installed, the bicycle frame is fixed to the middle of the bicycle frame, the chain wheel support 7 is externally connected with a chain wheel, and the pedal crank 8 is externally connected with a pedal.

When the motor is powered on to work, the stator assembly 3 in the first cavity 11 is powered on, the rotor assembly 2 and the stator assembly 3 directly generate lorentz force, and the rotor assembly 2 rotates around the stator assembly 3. The rotor assembly 2 drives the sun gear 51 to rotate synchronously, the sun gear 51 drives the planet gear 523 in the second cavity 12 to rotate, and the planet gear 523 drives the planet support 521 to rotate, so that the power speed reduction conversion is completed. The planet wheel 523 drives the clutch outer ring 61 to rotate through the positioning shaft 524 and the positioning connecting piece 611, the clutch outer ring 61 drives the clutch middle gear ring 62 to rotate through the pawl, and finally, the clutch middle gear ring 62 drives the sprocket support 7 and the external sprocket to rotate, so that the power output of the motor is completed.

When the manual drive is adopted, a rider pedals the external pedal plate, the pedal crank 8 drives the middle shaft 4 to rotate, the middle shaft 4 drives the clutch inner shaft sleeve 63, the clutch inner shaft sleeve 63 drives the clutch middle gear ring 62 to rotate through the pawl, and finally, the clutch middle gear ring 62 drives the chain wheel support 7 and the external chain wheel to rotate, so that the manual power output is completed.

During the movement of the motor, the insulating cooling liquid 14 flows in the first cavity 11, fully contacts with the heat generating components such as the stator assembly 3, performs heat exchange, transfers the heat to the casing 1 and then emits the heat to the outside air. Meanwhile, gear lubricating oil 15 flows in the second cavity 12, fully contacts with the planet wheel 523, the inner gear ring 522 and the like, plays a lubricating function, transfers heat to the machine shell 1, and then is emitted to the outside air.

Along with the increase of the working time of the motor, the temperature in the machine shell 1 gradually rises, the air pressure also gradually rises, and the air in the first cavity 11 flows to the outside of the machine shell 1 through the first oil-proof ventilation valve 111. The air in the second chamber 12 flows to the outside of the casing 1 through the second oil and gas permeable valve 121. After the motor stops working, the temperature in the casing 1 gradually decreases, the air pressure also gradually decreases, and the air outside the casing 1 flows into the inside of the casing 1 through the first oil-proof air-permeable valve 111 and the second oil-proof air-permeable valve 121.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. The utility model provides a put motor in coaxial-type, includes casing (1), axis (4), stator module (3), rotor subassembly (2), variable speed module (5), clutch module (6) are located inside casing (1), stator module (3) cover is established inside rotor subassembly (2) and is connected to on casing (1), its characterized in that: the middle shaft (4) penetrates through the stator assembly (3), the rotor assembly (2), the speed change module (5) and the clutch module (6), the speed change module (5) is connected with the rotor assembly (2), the clutch module (6) is respectively connected with the middle shaft (4) and the speed change module (5), and the middle shaft (4) penetrates through the machine shell (1) and extends out of the machine shell (1).

2. The coaxial centrally-mounted motor according to claim 1, wherein: a middle partition plate (13) is arranged in the machine shell (1), the middle partition plate (13) divides the interior of the machine shell (1) into a first cavity (11) and a second cavity (12), the middle shaft (4) penetrates through the middle partition plate (13), the speed change module (5) penetrates through the middle partition plate (13) and is connected with the rotor assembly (2), the stator assembly (3) and the rotor assembly (2) are arranged in the first cavity (11), and the speed change module (5) and the clutch module (6) are arranged in the second cavity (12).

3. The coaxial type centrally placed motor according to claim 2, wherein: the speed changing module (5) comprises a sun gear (51) and a planetary speed reducing mechanism (52), the planetary speed reducing mechanism (52) is connected with the clutch module (6), the sun gear (51) is sleeved between the middle shaft (4) and the middle partition plate (13), one end of the sun gear (51) is connected with the rotor assembly (2), and the other end of the sun gear (51) is meshed with the planetary speed reducing mechanism (52).

4. A coaxial type centrally placed motor according to claim 3, characterized in that: the planetary reduction mechanism (52) comprises a planetary support (521), a planetary wheel (523) and an inner gear ring (522), the planetary wheel (523) is arranged on the planetary support (521), the planetary wheel (523) is meshed with the sun wheel (51) and the inner gear ring (522), the inner gear ring (522) is connected with the machine shell (1), and the planetary support (521) is connected with the clutch module (6).

5. The coaxial centrally-mounted motor according to claim 4, wherein: the planet carrier (521) is connected to the sun gear (51) by a bearing.

6. The coaxial centrally-mounted motor according to claim 4, wherein: the planet carrier (521) is connected to the middle partition plate (13) through a bearing.

7. A coaxial type centrally placed motor according to claim 3, characterized in that: the middle of the rotor assembly (2) is provided with a rotor through hole (21), the sun gear (51) is provided with a first bend (511) at a position corresponding to the rotor through hole (21), and the first bend (511) penetrates through the rotor through hole (21) and is matched with the rotor through hole (21).

8. The coaxial type centrally placed motor according to claim 7, wherein: the stator assembly (3) is provided with a stator groove (31) at a position corresponding to the first bend (511), and the stator groove (31) is matched with the first bend (511).

9. The coaxial centrally-mounted motor according to claim 8, wherein: the middle clapboard (13) is provided with a middle clapboard through hole (131) in the middle, the sun gear (51) is provided with a second bend (512) at the position corresponding to the middle clapboard through hole (131), and the second bend (512) penetrates through the middle clapboard through hole (131) and is matched with the middle clapboard through hole (131).

10. The coaxial type centrally placed motor according to claim 7, wherein: the sun gear supporting device is characterized by further comprising a sun gear supporting bearing (513), wherein the sun gear supporting bearing (513) is sleeved between the middle shaft (4) and the sun gear (51).

11. The coaxial type center motor according to claim 10, wherein: the sun gear (51) is provided with a semi-closed bearing accommodating groove (514), and the bearing accommodating groove (514) is matched with the sun gear supporting bearing (513) and accommodates the sun gear supporting bearing (513).

12. The coaxial mid-motor according to claim 11, wherein: still include sun gear clamp plate (515), sun gear clamp plate (515) with bearing holding tank (514) dismantlement formula is connected, sun gear clamp plate (515) with sun gear support bearing (513) are inconsistent.

13. The coaxial type center motor according to claim 12, wherein: still include connecting piece (9), rotor subassembly (2) are in the periphery of rotor through-hole (21) is provided with rotor connecting hole (22), first buckle (511) with rotor connecting hole (22) correspond the position and be provided with sun gear connecting hole (516), sun gear clamp plate (515) with rotor connecting hole (22) correspond the position and be provided with clamp plate connecting hole (517), connecting piece (9) pass rotor connecting hole (22) sun gear connecting hole (516), clamp plate connecting hole (517).

14. The coaxial centrally-mounted motor according to claim 4, wherein: the clutch device is characterized by further comprising a chain wheel support (7), wherein the chain wheel support (7) is connected with the clutch module (6).

15. The coaxial mid-motor according to claim 14, wherein: the multifunctional bicycle is characterized by further comprising a pedal crank (8), wherein the pedal crank (8) is connected with the part of the middle shaft (4) extending out of the shell (1).

16. The coaxial mid-motor according to claim 15, wherein: the positioning shaft (524) is arranged on the planet support (521), the positioning connecting piece (611) is arranged on the clutch module (6), the positioning shaft (524) is matched with the positioning connecting piece (611), the planet support (521) is connected with the clutch module (6) through the positioning shaft (524) and the positioning connecting piece (611), and the planet wheel (523) is sleeved outside the positioning shaft (524).

17. The coaxial mid-motor according to claim 16, wherein: the outer side of the planet carrier (521) is provided with a first boss (525), the outer side of the clutch module (6) is provided with a second boss (612), the positioning shaft (524) is arranged on the first boss (525), and the positioning connecting piece (611) is arranged on the second boss (612).

18. The coaxial mid-motor according to claim 17, wherein: clutch module (6) include that outside-in overlaps in proper order establishes in clutch outer lane (61), the clutch ring gear (62), the clutch inner shaft cover (63), axle sleeve (63) cover is established in the clutch shaft (4) outside and with axis (4) splined connection, ring gear (62) with sprocket support (7) are connected in the clutch, second boss (612) set up on clutch outer lane (61).

19. The coaxial type center motor according to claim 9, wherein: the cooling device also comprises an insulating cooling liquid (14), wherein the insulating cooling liquid (14) is positioned in the first cavity (11).

20. The coaxial centrally-mounted motor according to claim 19, wherein: the gear lubricating oil lubricating device further comprises gear lubricating oil (15), and the gear lubricating oil (15) is located in the second cavity (12).

21. The coaxial mid-motor according to claim 20, wherein: the sun gear oil seal device is characterized by further comprising a sun gear oil seal (518), wherein the sun gear oil seal (518) is sleeved between the middle shaft (4) and the sun gear (51).

22. The coaxial mid-motor according to claim 20, wherein: the middle clapboard oil seal (132) is sleeved between the second bending part (512) and the middle clapboard through hole (131).

23. The coaxial mid-motor according to claim 20, wherein: the oil-proof air-permeable valve is characterized by further comprising a first oil-proof air-permeable valve (111), an oil-proof air-permeable membrane is arranged in the first oil-proof air-permeable valve (111), a first air hole (112) which is communicated with the first cavity (11) is formed in the first cavity, and the first oil-proof air-permeable valve (111) is matched with the first air hole (112) and seals the first air hole (112).

24. The coaxial mid-motor according to claim 20, wherein: the oil-proof air-permeable valve is characterized by further comprising a second oil-proof air-permeable valve (121), an oil-proof air-permeable membrane is arranged in the second oil-proof air-permeable valve (121), a through second air hole (122) is formed in the second cavity (12), and the second oil-proof air-permeable valve (121) is matched with the second air hole (122) and seals the second air hole (122).