Middle motor

Abstract

The utility model discloses a centrally-mounted motor, which comprises a shell, a control module, a motor module and a speed reduction module are sequentially arranged in the shell along the axial direction, the speed reduction module comprises a central tooth, a planetary gear and a gear ring, the motor module comprises a stator and a rotor, the central tooth is connected with the rotor, the gear ring is fixed with the inner wall of the shell, and the planetary gear is connected with the stator. The two sides of the planetary gear are meshed with the center tooth and the gear ring respectively, the planetary gear and the rotation center of the rotor are concentrically arranged, and the speed reduction module adopts multi-stage planetary speed reduction, so that the motor is small in overall size, compact in structure, higher in speed reduction ratio, modularized in structure, easy to maintain and high in reliability. And flexible combination can be achieved according to various rotation requirements, universality is good, and adaptability is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor field especially is related to a middle -mounting motor. BACKGROUND

[0002] The middle -mounting motor is mainly applied in the electric power assist bicycle field, and it is the motor that the drive motor of electric power assist bicycle is installed in the middle position of the car body, namely the motor of pedal position, the motor is connected with the car body, and the power is transmitted through the chain and the rear wheel.

[0003] Through the retrieval, the China patent with the announcement number CN219760809U discloses a kind of middle -mounting motor, including main controller and torque sensor, the torque sensor is installed on middle shaft, torque sensor component area is equipped on the main controller, and connecting terminal is equipped in the torque sensor component area, the connecting terminal is connected with the adapter terminal of torque sensor by connection wire harness.The component that is integrated in the torque sensor shell is transferred to the main controller, so as to simplify the structure of torque sensor, when the component aging, damage problem is encountered, torque sensor is no longer needed to be disassembled, and main controller can be overhauled by just opening shell, so as to reduce the use and maintenance cost of middle -mounting motor.

[0004] But the power of the motor is transmitted in turn through primary driving wheel, primary driven wheel, secondary driving wheel and secondary driven wheel, and the center line of primary driving wheel and primary driven wheel is arranged in parallel, finally resulting in that the overall volume of motor is large, there is not compact structure, and it needs to be further improved. UTILITY MODEL CONTENTS

[0005] In order to further reduce the volume and improve the compactness of the structure, the application provides a middle -mounting motor.

[0006] The application provides a middle -mounting motor, which adopts the following technical scheme:

[0007] A middle -mounting motor, comprising a shell, a control module, a motor module and a speed reduction module are sequentially arranged in the shell in the axial direction, the speed reduction module comprises a center tooth, a planetary gear and a gear ring, the motor module comprises a stator and a rotor, the center tooth is connected with the rotor, the gear ring is fixed with the inner wall of the shell, the two sides of the planetary gear are respectively engaged with the center tooth and the gear ring, and the planetary gear is concentrically arranged with the rotation center of the rotor.

[0008] Optionally, a hollow center hole is formed in the center of the shell, an output planet carrier is connected to the planetary gear, a support bearing is arranged inside the shell and sheathed on the outer periphery of the output planet carrier, the inner wall of the support bearing abuts against the outer wall of the output planet carrier, and the outer wall of the support bearing abuts against the inner wall of the shell.

[0009] Optionally, the deceleration module is sequentially provided with three groups in the axial direction, the central teeth include first, second and third central teeth, the planetary gears include first, second and third planetary gears, the gear rings include first, second and third gear rings, the output frames include first, second and third output planetary frames, the first planetary gears are connected with the rotor, the first output planetary frame is fixedly connected with the second central teeth, the second output planetary frame is fixedly connected with the third central teeth, and the third output planetary frame serves as an output end.

[0010] Optionally, the inside of the shell is separated into independent motor cavities and deceleration cavities in the axial direction, the motor cavities are used for mounting the stator and the rotor, the deceleration cavities are used for mounting the deceleration module, the shell is provided with a tail plate on the side away from the deceleration cavities, the tail plate is detachably connected with the shell and forms a control cavity, and the control cavity is used for mounting the control module.

[0011] Optionally, a middle shaft is mounted in the central hole, the middle shaft is a torque middle shaft, and the middle shaft is connected with the third output planetary frame and outputs power.

[0012] Optionally, the central hole is provided with cover plates at both ends for closing the central hole, and the cover plates are detachably connected with the shell.

[0013] Optionally, the central hole is provided with end bearings sleeved on both ends of the middle shaft.

[0014] Optionally, the shell includes a body and end plates at both ends, the end plates are detachably connected with the body, the inside of the body is provided with a partition plate, and the motor cavities and the deceleration cavities are arranged on the two sides of the partition plate, respectively.

[0015] Optionally, the shell is provided with fixed lugs on the top, and the fixed lugs are provided with mounting holes.

[0016] Optionally, the fixed lugs are spaced apart and distributed around the upper half of the shell.

[0017] In summary, the present application has at least one of the following beneficial technical effects:

[0018] 1. The multi-stage planetary deceleration of the deceleration module makes the overall size of the motor small and compact, and has a higher deceleration ratio.

[0019] 2. The modular structure of each part of the motor is simple to maintain and facilitates subsequent maintenance and repair.

[0020] 3. High integration can shorten and simplify the circuit and achieve the purpose of high efficiency.

[0021] 4. Whether the central hole is installed with a shaft can be selected according to actual needs, and can be flexibly combined according to various rotation needs, and is good in universality and stronger in adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a whole structure diagram of the embodiment of the application.

[0023] Figure 2 is an end face view of a reduction module in the embodiment of the application.

[0024] Figure 3 is a side view of the reduction module after explosion in the embodiment of the application.

[0025] Figure 4 is an exploded perspective view of the reduction module in the embodiment of the application.

[0026] Figure 5 is an end face view of the embodiment of the application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1. housing; 2. body; 3. end plate; 4. partition plate; 5. stator; 6. rotor; 7. motor cavity; 8. reduction cavity; 9. tail plate; 10. control cavity; 11. central hole; 12. first central tooth; 13. second central tooth; 14. third central tooth; 15. first planetary gear; 16. second planetary gear; 17. third planetary gear; 18. first output planet carrier; 19. second output planet carrier; 20. third output planet carrier; 21. first gear ring; 22. second gear ring; 23. third gear ring; 24. first support bearing; 25. second support bearing; 26. third support bearing; 27. shaft; 28. end bearing; 29. fixed lifting lug; 30. mounting hole; 31. first mounting column; 32. second mounting column; 33. third mounting column; 34. output terminal; 35. connecting part. DETAILED DESCRIPTION

[0029] The following will be described in detail in combination with the accompanying Figures 1-5 The application will be further described in detail.

[0030] The embodiment of the application discloses an inner-embedded motor.

[0031] As Figure 1As shown, a kind of middle motor, mainly for power-assisted bicycle, it mainly includes shell 1, control module, motor module and reduction module, shell 1 includes body 2 and the end plate 3 of two ends, body 2 middle part has the partition plate 4 and is separated into motor cavity 7 and reduction cavity 8, motor module includes stator 5 and rotor 6 and is installed in motor cavity 7, reduction module includes center tooth, planetary gear and gear ring and is installed in reduction cavity 8, the side of body 2 away from reduction cavity 8 has tail plate 9, tail plate 9 and shell 1, end plate 3 form control cavity 10 for control module installation between, control module includes controller and is installed in control cavity 10, tail plate 9 and body 2 can be detachably connected, tail plate 9, end plate 3 and body 2 can be connected in the embodiment of screw or bolt mode and realize detachable.

[0032] As Figure 1 As shown, the center of shell 1 has hollow center hole 11, center hole 11 is used to install middle shaft 27, output planet carrier is connected and installed on planetary gear, and support bearing is arranged in the inside of shell 1 and is sleeved on the outer periphery of output planet carrier, the inner wall of support bearing abuts against the outer wall of output planet carrier, and the outer wall of support bearing abuts against the inner wall of shell 1, so that the output planet carrier can be centrally positioned by means of the support bearing, and the middle motor can be used even if the middle shaft 27 is not installed in the center hole 11, and the middle motor can be used as an electric vehicle when being installed on a bicycle.

[0033] As Figures 1-4 As shown, the reduction module is sequentially provided with three groups along the axial direction of shell 1, that is, three-stage reduction is realized, the center tooth includes first center tooth 12, second center tooth 13 and third center tooth 14, the planetary gear includes first planetary gear 15, second planetary gear 16 and third planetary gear 17, the output planet carrier includes first output planet carrier 18, second output planet carrier 19 and third output planet carrier 20, and the gear ring includes first gear ring 21, second gear ring 22 and third gear ring 23, in the embodiment, the center of the reduction module is concentrically arranged with the center of the motor module, so that the overall volume of the middle motor is smaller, the structure is more compact, and each different module is sequentially arranged along the axial direction, the modular design of the structure is realized, maintenance is simple, subsequent overhaul and maintenance are facilitated, the control module, the motor module and the reduction module are integrated together, high integration is realized, the circuit can be shortened and simplified, and the reduction structure of the planetary gear can realize greater reduction ratio and achieve better reduction effect.

[0034] As Figures 1-4The first center tooth 12 is fixedly connected with the rotor 6 of the motor, the first ring gear 21 is arranged in correspondence with the first center tooth 12 in the axial direction, one side of the first planetary gear 15 is engaged with the first center tooth 12, the other side of the first planetary gear 15 is engaged with the inner wall of the first ring gear 21, and the outer periphery of the first ring gear 21 is fixedly connected with the inner wall of the housing 1. Thus, by driving the rotor 6 and rotating the first center tooth 12, the first planetary gear 15 can rotate around the first center tooth 12 while rotating around the first center tooth 12. The first planetary gear 15 is uniformly distributed around the circumference, and in this embodiment, the first planetary gear 15 is distributed around the circumference in three parts. The first output planet carrier 18 is annular, and the first output planet carrier 18 has a first mounting column 31 for mounting the first planetary gear 15. The first planetary gear 15 is rotatably connected to the first mounting column 31, and the first planetary gear 15 is arranged in one-to-one correspondence with the first mounting column 31. The first planetary gear 15 rotates around the circumference while driving the first output planet carrier 18 to rotate to achieve the first power output. The inner ring of the first output planet carrier 18 is fixedly connected with the second center tooth 13 to achieve power transmission. One side of the second planetary gear 16 is engaged with the second center tooth 13, and the other side of the second planetary gear 16 is engaged with the second ring gear 22. The second ring gear 22 is fixedly connected with the inner wall of the housing 1 to achieve power transmission to the second planetary gear 16. The second output planet carrier 19 has a second mounting column 32 for mounting the second planetary gear 16. The second planetary gear 16 is arranged in one-to-one correspondence with the second mounting column 32, and the second planetary gear 16 is rotatably connected to the second mounting column 32. The second center tooth 13 rotates to drive the second planetary gear 16 to rotate around the center of the second center tooth 13, thereby driving the second output planet carrier 9 to rotate to achieve the second power output. The second output planet carrier 19 is fixedly connected with the third center tooth 14 to achieve power transmission. One side of the third planetary gear 17 is engaged with the third center tooth 14, and the other side of the third planetary gear 17 is engaged with the inner wall of the third ring gear 23. The third ring gear 23 is fixedly connected with the inner wall of the housing 1. The third output planet carrier 20 has a third mounting column 33 for mounting the third planetary gear 17. The third planetary gear 17 is rotatably connected to the third mounting column 33. The third center tooth 14 rotates to drive the third planetary gear 17 to rotate around the center of the third center tooth 14, thereby driving the third output planet carrier 20 to rotate around the circumference to output power as an output end.

[0035] As Figures 1-4As shown, the support bearing includes a first support bearing 24, a second support bearing 25 and a third support bearing 26, the first support bearing 24 is sleeved on the outer periphery of the first output planet carrier 18 and is limited to the center, ensuring that the center of the first output planet carrier 18 is concentric with the center of the motor, and the outer periphery of the first support bearing 24 abuts on the inner wall of the shell 1, the second support bearing 25 is correspondingly arranged with the second output planet carrier 19, and the third support bearing 26 is correspondingly arranged with the third output planet carrier 20.

[0036] As shown in the figure, Figures 1-4 The central hole 11 is provided with a central shaft 27, which is a torque central shaft. In actual use, the third output planet carrier 20 and the central shaft 27 are drivingly connected to realize power output. The output terminal 34 of the third output planet carrier 20 and the central shaft 27 is provided between the third output planet carrier 20 and the central shaft 27. The output terminal 34 and the central shaft 27 can be directly connected by spline or circumferentially driven by a one-way clutch. The output terminal 34 and the third output planet carrier 20 can also be directly connected by spline or circumferentially driven by a one-way clutch. The output terminal 34 has a connecting part 35 connected with the sprocket chain wheel key, which finally realizes the transmission of power to the sprocket chain wheel. In this way, various rotating requirements can be flexibly combined, which is good in universality and stronger in adaptability. When the central shaft 27 is not installed, the cover plate can be installed at both ends of the central hole 11 to be closed. The cover plate and the shell 1 can be detachably connected by bolts or screws. At this time, the central motor is installed on the bicycle, and the power of the third output planet carrier 20 is transmitted to the wheel as an electric vehicle. The central hole 11 is provided with a torque central shaft 27 to connect with the pedal to realize power output, which has better applicability.

[0037] As shown in the figure, Figures 1-4 The central hole 11 is provided with an end bearing 28 for sleeving on both ends of the central shaft 27. The end bearing 28 supports the central shaft 27 and improves the stability and smoothness of the rotation of the central shaft 27.

[0038] As shown in the figure, Figure 1 and Figure 5 A fixing lug 29 is arranged on the top of the shell 1. An installation hole 30 is formed in the fixing lug 29. The installation hole 30 can better fix and install the shell 1 on the frame. In the embodiment, the fixing lug 29 is provided with three and is uniformly and interval distributed on the upper half periphery of the shell 1, which improves the stability of the central motor installed on the frame.

[0039] The working principle of the embodiment of the application is as follows: the rotation of the rotor 6 of the motor drives the rotation of the first central tooth 12, the first tooth ring 21 is fixed, thereby driving the circumferential rotation of the first planetary gear 15 and the first output planet carrier 18, completing the first-stage reduction, the first output planet carrier 18 is connected with the second central tooth 13 to drive the rotation of the second central tooth 13, the second tooth ring 22 is fixed, thereby driving the circumferential rotation of the second planetary gear 16 and the second output planet carrier 19, completing the second-stage reduction, the second output planet carrier 19 is connected with the third central tooth 14 to drive the rotation of the third central tooth 14, the third tooth ring 23 is fixed, thereby driving the circumferential rotation of the third planetary gear 17 and the third output planet carrier 20, completing the third-stage reduction, finally, the third output planet carrier 20 is connected with the middle shaft 27 to realize the output of power, realizing the three-stage reduction in series of the middle shaft motor, and achieving the purpose of high reduction ratio.

[0040] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: all equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. An electric motor having a middle position, characterized in that: The application relates to a shell (1) which is sequentially provided with a control module, a motor module and a reduction module in the axial direction, the reduction module comprises a central gear, a planetary gear and a gear ring, the motor module comprises a stator (5) and a rotor (6), the central gear is connected with the rotor (6), the gear ring is fixed to the inner wall of the shell (1), and the two sides of the planetary gear are respectively engaged with the central gear and the gear ring, and the planetary gear is concentrically arranged with the rotation center of the rotor (6).

2. An IPM as set forth in claim 1, characterized by: A hollow central hole (11) is formed in the center of the shell (1), an output planet carrier is connected to the planetary gear, a supporting bearing is arranged in the shell (1) and sleeved on the outer periphery of the output planet carrier, the inner wall of the supporting bearing is in abutment with the outer wall of the output planet carrier, and the outer wall of the supporting bearing is in abutment with the inner wall of the shell (1).

3. An IPM as set forth in claim 2, characterized by: The reduction module is sequentially provided with three groups in the axial direction, the central gear comprises a first central gear (12), a second central gear (13) and a third central gear (14), the planetary gear comprises a first planetary gear (15), a second planetary gear (16) and a third planetary gear (17), the gear ring comprises a first gear ring (21), a second gear ring (22) and a third gear ring (23), the output planet carrier comprises a first output planet carrier (18), a second output planet carrier (19) and a third output planet carrier (20), the first planetary gear (15) is connected with the rotor (6), the first output planet carrier (18) is fixedly connected with the second central gear (13), the second output planet carrier (19) is fixedly connected with the third central gear (14), and the third output planet carrier (20) serves as an output end.

4. An IPM as set forth in claim 1, characterized by: The shell (1) is axially divided into independent motor cavities (7) and reduction cavities (8) in the shell (1), the motor cavities (7) are used for mounting the stator (5) and the rotor (6), the reduction cavities (8) are used for mounting the reduction module, one side of the shell (1) away from the reduction cavities (8) is provided with a tail plate (9), the tail plate (9) is detachably connected with the shell (1) and forms a control cavity (10), and the control cavity (10) is used for mounting the control module.

5. An IPM as set forth in claim 3, characterized by: A central shaft (27) is mounted in the central hole (11), the central shaft (27) is a torque central shaft, the central shaft (27) is connected with the third output planet carrier (20) and outputs power.

6. An IPM as set forth in claim 2, characterized by: The central hole (11) is provided with cover plates at both ends of the central hole (11) for closing the central hole (11), and the cover plates are detachably connected with the shell (1).

7. An electric motor according to claim 5, wherein: End portion bearings (28) are arranged at both ends of the central shaft (27) and sleeved on the central shaft (27).

8. An electric motor as claimed in claim 4, wherein: The shell (1) comprises a body (2) and end plates (3) at both ends, the end plates (3) are detachably connected with the body (2), the body (2) is internally provided with a partition plate (4), and the two sides of the partition plate (4) are respectively the motor cavities (7) and the reduction cavities (8).

9. An electric motor as claimed in claim 1, wherein: A fixed lug (29) is arranged on the top of the shell (1), and a mounting hole (30) is formed in the fixed lug (29).

10. An electric machine according to claim 9, characterized in that: A plurality of fixed lugs (29) are distributed at the upper half circumference of the shell (1) at intervals.

Images