Modularized micro gear motor capable of selectively matching output torque in production

Abstract

The invention relates to the technical field of micro motors, in particular to a modular micro gear motor capable of selectively matching output torque in production, which comprises a driving unit and a transmission unit independently arranged outside the driving unit, and is characterized in that the driving unit comprises a first shell, and a stator assembly and a rotor assembly which are arranged in the first shell and are matched with each other; the rotor assembly comprises a rotor shaft extending out of the first shell; the transmission unit comprises a second shell, a transmission assembly arranged in the second shell and an output shaft extending out of the second shell and used for being connected with a load, the second shell is relatively fixedly connected to the first shell, and the rotor shaft extends into the second shell and is in transmission fit connection with the output shaft through the transmission assembly. The transmission unit and the driving unit with different speed reduction proportions or different speed reduction modes can be selected according to requirements to be assembled and matched, and the problems that production procedures are complex, and the models of parts are various are solved. Production procedures are simplified, and production efficiency is improved.

Description

[Technical field]

[0001] The present invention relates to the technical field of micro motors, and in particular to a modular micro reduction motor with optional output torque during production. [Background technology]

[0002] A reduction motor refers to an integration of a reducer and an electric motor (motor). This integration is also commonly called a gear motor or gear motor. It is usually integrated and assembled by a professional reducer manufacturer and supplied as a complete set. Reduction motors are widely used in the steel industry, machinery industry, etc. The advantage of using reduction motors is that they simplify the design and save space.

[0003] When the existing reducer is matched with the original motor, when installing the reducer and motor with different reduction ratios or different reduction methods, the corresponding motor and reducer need to be assembled together. This requires the production or purchase of motors of different models to match the corresponding reducers, which will make the production process complicated, with a wide variety of parts models. Self-production also requires additional molds, resulting in excessively high production costs. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to provide a modular micro reduction motor with optional output torque in production, standardize the drive unit, and the transmission unit can be optionally matched with the drive unit. According to the needs, the transmission unit with different reduction ratios or different reduction modes can be selected and assembled with the drive unit, so that different transmission units do not need to select different drive units for assembly, which solves the problems of complex production process and numerous parts models. The production process is simplified and production efficiency is improved.

[0005] In order to solve the above technical problems, the present invention proposes a modular micro-reduction motor with optional output torque during production, including a drive unit and a transmission unit independently arranged outside the drive unit, the drive unit includes a first shell, a stator assembly and a rotor assembly arranged in the first shell and cooperating with each other, the rotor assembly includes a rotor shaft extending from the first shell; the transmission unit includes a second shell, a transmission assembly arranged in the second shell and an output shaft extending from the second shell for connecting a load, the second shell is relatively fixedly connected to the first shell, the rotor shaft extends into the second shell and is connected to the output shaft through the transmission assembly, the axial height of the second shell is less than the axial height of the first shell, so that the transmission unit has a flat structure.

[0006] As described above, in a modular micro reduction motor with optional output torque during production, the upper end of the inner wall of the first shell is upwardly protruded to form a groove, and a first sleeve is embedded in the groove, and the rotor shaft is rotatably matched with the first sleeve.

[0007] In the modular micro reduction motor with optional output torque in production as described above, the first sleeve is made of copper or nylon.

[0008] As described above, in a modular micro reduction motor with optional output torque during production, the first shell and the second shell have the same diameter.

[0009] As described above, in a modular micro reduction motor with optional output torque in production, the connection between the second shell and the first shell is achieved by riveting or by providing a countersunk hole at the bottom of the second shell and locking the countersunk hole with a countersunk screw.

[0010] As described above, a modular micro reduction motor with optional output torque in production, the transmission assembly includes a first sun gear arranged on the rotor shaft and a first output rotating plate arranged on the first sun gear and rotatably matched with the first sun gear, and also includes a plurality of first planetary gears rotatably arranged at the bottom of the first output rotating plate and meshing with the first sun gear, the lower part of the first planetary gear is provided with a pinion gear that moves with it, the bottom of the second shell is formed with an inner gear ring for the rotor shaft to pass through and meshing with the pinion gear, and the output shaft is relatively fixedly arranged on the first output rotating plate.

[0011] As described above, in a modular micro reduction motor with optional output torque in production, the transmission assembly also includes a second sleeve arranged on the upper part of the second shell, and the second sleeve is rotatably connected to the second shell, the output shaft passes through the second sleeve and is fixedly connected relative to the second sleeve, and the outer side of the lower end of the second sleeve is circumferentially formed with a limiting portion for separating the first output rotating plate from the top of the second shell.

[0012] As described above, a modular micro reduction motor with optional output torque in production, the transmission assembly includes a second sun gear arranged on the rotor shaft, a second output rotating plate arranged on the second sun gear and relatively rotatingly matched with the second sun gear, the output shaft is relatively fixedly arranged on the second output rotating plate, and also includes a plurality of lower planetary gears rotatably arranged at the bottom of the second housing and meshing with the second sun gear, a plurality of upper planetary gears rotatably arranged at the bottom of the second output rotating plate and meshing with the second sun gear, and a differential gear ring assembly rotatably arranged in the second housing and cooperating with the lower planetary gears and the upper planetary gears to reduce the speed of the upper planetary gears so as to generate a speed difference between the upper planetary gears and the second sun gear.

[0013] As described above, in a modular micro reduction motor with optional output torque during production, the outer shell of the differential ring gear assembly is provided with a ring gear sleeve rotatably connected thereto.

[0014] As described above, in a modular micro reduction motor with optional output torque in production, the differential ring gear assembly includes a lower ring gear meshing with the lower planetary gear and an upper ring gear meshing with the upper planetary gear, the upper ring gear and the lower ring gear are arranged to move together, and the upper ring gear and the lower ring gear have the same module, and the number of teeth of the upper ring gear is less than the number of teeth of the lower ring gear.

[0015] Compared with the prior art, the modular micro reduction motor of the present invention, which can select output torque during production, has the following advantages:

[0016] 1. In the production and assembly of the present invention, the drive unit is a standard accessory, and the transmission unit can be optionally matched with the drive unit. According to the needs, the transmission units with different reduction ratios or different reduction modes can be selected and assembled with the drive unit. In this way, there is no need to select different drive units for assembly for different transmission units, thereby simplifying the production process and improving production efficiency.

[0017] 2. The present invention does not need to open a mold to produce another drive unit to adapt to transmission units with different reduction ratios or different reduction modes, thereby reducing production costs.

[0018] 3. In the present invention, when the transmission unit and the driving unit are connected, they are both connected and fixed to each other through the first shell and the second shell, which simplifies the installation method and standardizes the installation process, thereby making the entire production process more standardized.

[0019] 4. In the present invention, the axial height of the second housing is smaller than that of the first housing, so that the transmission unit has a flat structure. Compared with the volume of the previous transmission assembly, this design can make the volume of the entire structure more compact and flat, without changing the output power of the original drive unit, and can also adapt to narrower and more cramped spaces.

Brief Description of the Drawings

[0020] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the driving unit in the present invention.

[0023] Figure 3 It is a schematic diagram of the decomposed structure of the drive unit in the present invention.

[0024] Figure 4 It is another structural schematic diagram of the driving unit in the present invention.

[0025] Figure 5 It is a cross-sectional view of the present invention.

[0026] Figure 6 It is one of the exploded structural diagrams of the transmission assembly in the present invention.

[0027] Figure 7 This is the second schematic diagram of the decomposed structure of the transmission assembly in the present invention.

[0028] Figure 8 It is a structural schematic diagram of the first sun gear in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the inner gear ring in the present invention.

[0030] Fig.10 This is the third schematic diagram of the decomposed structure of the transmission assembly in the present invention.

[0031] Fig.11 This is the fourth schematic diagram of the decomposed structure of the transmission assembly in the present invention.

[0032] Fig.12 This is the fifth schematic diagram of the decomposed structure of the transmission assembly in the present invention.

[0033] Fig.13 This is the sixth schematic diagram of the decomposed structure of the transmission assembly in the present invention.

[0034] Fig.14 It is a schematic diagram of the structure of the second sun gear in the present invention.

[0035] Fig.15 It is another structural schematic diagram of the second sun gear in the present invention.

[0036] In the figure: 1, drive unit; 10, first housing; 11, stator assembly; 12, rotor assembly; 13, rotor shaft; 14, groove; 15, first sleeve; 16, countersunk hole;

[0037] 2. Transmission unit; 20. Second housing; 21. Output shaft; 22. Cover plate;

[0038] 3. Transmission assembly; 30. First sun gear; 31. First output rotating plate; 32. First planetary gear; 33. Pinion gear; 34. Internal gear ring; 35. Second shaft sleeve; 36. Position limiting part;

[0039] 40. Second sun gear; 41. Second output rotating plate; 42. Lower planetary gear; 43. Upper planetary gear; 44. Differential ring gear assembly; 45. Ring gear sleeve; 46. Lower ring gear; 47. Upper ring gear. [Specific implementation method]

[0040] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] like Figure 1-15As shown, the present invention includes a modular micro reduction motor with optional output torque in production, including a drive unit 1 and a transmission unit 2 independently arranged outside the drive unit 1, wherein the drive unit 1 includes a first housing 10, a stator assembly 11 and a rotor assembly 12 arranged in the first housing 10 and matching with each other, wherein the rotor assembly 12 includes a rotor shaft 13 extending from the first housing 10. The transmission unit 2 includes a second housing 20, a transmission assembly 3 arranged in the second housing 20, and an output shaft 21 extending from the second housing 20 for connecting a load, wherein the second housing 20 is relatively fixedly connected to the first housing 10, wherein the rotor shaft 13 extends into the second housing 20 and is transmission-matchedly connected to the output shaft 21 through the transmission assembly 3, wherein the axial height of the second housing 20 is less than the axial height of the first housing 10, so that the transmission unit 2 is a flat structure.

[0042] In the production and assembly of the present invention, the drive unit 1 is a standard accessory, and the transmission unit 2 can be optionally matched with the drive unit 1. According to the needs, the transmission units 2 with different reduction ratios or different reduction modes can be selected to be assembled with the drive unit 1. In this way, there is no need to select different drive units 1 for assembly for different transmission units 2, thereby simplifying the production process and improving production efficiency. There is no need to open a mold to produce another drive unit 1 to adapt to the transmission units 2 with different reduction ratios or different reduction modes, thereby reducing the production cost.

[0043] When the two are fixed to each other, the entire drive unit 1 is installed first, and then the second housing 20 of the transmission unit 2 is connected and fixed to the first housing 10 of the drive unit 1, and then the transmission assembly 3 is arranged in the second housing 20 and connected and matched with the rotor shaft 13. It should be further explained that the second housing 20 includes a cover plate 22. After the transmission assembly 3 is installed in the second housing 20, the transmission assembly 3 can be restricted in the second housing 20 by the cover plate 22. Therefore, when the transmission unit 2 with different reduction ratios or different reduction modes is connected to the drive unit 1, it is connected and fixed to each other through the first housing 10 and the second housing 20, which also simplifies the installation method, makes the installation process tend to be standardized, and makes the entire production process more standardized.

[0044] Generally speaking, the larger the volume of the transmission unit 2, the greater its power is usually. This is because the large-volume first shell 10 can accommodate a larger rotor and more coils, thereby providing a greater energy output. If you want to reduce the volume of the transmission unit 2 while keeping the output power unchanged, the technical difficulty is very large. Therefore, in this embodiment, the axial height of the second shell 20 is smaller than the axial height of the first shell 10 so that the transmission unit 2 has a flat structure. Compared with the volume of the previous transmission assembly 3, this design can make the volume of the entire structure more compact and flat, without changing the output power of the original drive unit 1, so that it can adapt to narrower and more cramped spaces. When applied to the field of home appliances, it can adapt to more products, such as the drive motor of the air outlet of the air conditioner, the lifting motor of the curtain, or applied to surveillance cameras.

[0045] like Figure 4 As shown, as a further solution of this embodiment, in order to make the rotation of the rotor shaft 13 more stable, the upper end of the inner wall of the first shell 10 is convexly formed with a groove 14, and a first sleeve 15 is embedded in the groove 14. The rotor shaft 13 rotates with the first sleeve 15, and the material of the first sleeve 15 is copper or nylon. After the first sleeve 15 is set, the rotor shaft 13 can be axially supported to make its rotation more stable, and the material of the first sleeve 15 is copper or nylon, which can have a self-lubricating effect during the rotation process. In this application, nylon material is preferably used, which can be cheaper and can also make the entire product lighter.

[0046] As a further solution of this embodiment, the first shell 10 and the second shell 20 have the same diameter. By setting the diameters of the first shell 10 and the second shell 20 to the same size, it is convenient for alignment and installation. At the same time, under the premise that the axial height of the second shell 20 is less than the axial height of the first shell 10, the diameter of the second shell 20 does not exceed the diameter of the first shell 10, which can also make the entire structure more compact.

[0047] like Fig. 9 As shown, as a further solution of this embodiment, the connection between the second housing 20 and the first housing 10 is riveted or a countersunk hole 16 is set at the bottom of the second housing 20 and a countersunk screw is locked into the countersunk hole 16 to be locked and connected with the first housing 10. The connection method using the countersunk screw can reduce the space occupied by the locking bolt in the second housing 20, and the connection can be more stable by riveting. It should be noted that the countersunk screw is not shown in the present application.

[0048] like Figures 6 to 9As shown, as a preferred solution of this embodiment, the transmission assembly 3 includes a first sun gear 30 arranged on the rotor shaft 13 and a first output rotating plate 31 arranged on the first sun gear 30 and rotatably matched with the first sun gear 30, and also includes a plurality of first planetary gears 32 rotatably arranged at the bottom of the first output rotating plate 31 and meshing with the first sun gear 30, and a pinion 33 moving synchronously with the first planetary gear 32 is provided at the lower portion of the first planetary gear 32, and an inner gear ring 34 for the rotor shaft 13 to pass through and meshing with the pinion 33 is formed at the bottom of the second housing 20, and the output shaft 21 is relatively fixedly arranged on the first output rotating plate 31.

[0049] In this embodiment, the rotor shaft 13 drives the first sun gear 30 to rotate, and the first sun gear 30 drives the first planetary gear 32 to rotate. Since the first planetary gear 32 and the pinion gear 33 are synchronously arranged, when the first planetary gear 32 rotates, the pinion gear 33 is driven to rotate at the same angular velocity as the first planetary gear 32. The pinion gear 33 then cooperates with the inner gear ring 34. The pinion gear 33 revolves around the first sun gear 30 along the inner gear ring 34 while rotating on its own, thereby driving the first output rotating plate 31 to rotate. After deceleration, the rotation speed of the first output rotating plate 31 is less than the rotation speed of the rotor shaft 13. The first output rotating plate 31 then drives the output shaft 21 to rotate, thereby achieving deceleration. Therefore, the rotor shaft 13 can be decelerated by the transmission assembly 3 to output a greater torque.

[0050] The traditional reduction motor directly sets a large reduction gear to cooperate with the gear on the motor shaft, and the output shaft 21 is set on the large reduction gear. In this way, the output shaft 21 and the motor shaft are eccentrically set, and the large reduction gear is subjected to unilateral force, which will cause unstable output. In addition, to achieve a large reduction ratio, the large reduction gear will far exceed the side of the original motor, causing one side to bulge. In this way, when installing, it is necessary to consider the installation space of the bulging part, which increases the difficulty of design and manufacturing, thereby increasing production costs and wasting more space. In addition, this type of reduction motor is generally used in the field of household appliances, and its size is small, such as the motor of the air outlet of the air conditioner, the lifting motor of the curtain, etc., which makes the goal of pursuing lightweight and small size more difficult to achieve.

[0051] From the above, it can be seen that after the output shaft 21 of the present application is decelerated, it is coaxially arranged with the original rotor shaft 13, so that the force of the entire structure can be more balanced. Compared with traditional reduction motors, the micro reduction motor of the present application can be more stable and occupy a smaller volume.

[0052] As a further solution of this embodiment, the transmission assembly 3 also includes a second sleeve 35 disposed on the upper part of the second housing 20, and the second sleeve 35 is rotatably connected to the second housing 20, the output shaft 21 passes through the second sleeve 35 and is fixedly connected relative to the second sleeve 35, and a limiting portion 36 for separating the first output rotating plate 31 from the top of the second housing 20 is formed on the outer side of the lower end of the second sleeve 35 along the circumferential direction. In order to make the output of the output shaft 21 more stable, after the second sleeve 35 is provided, the output shaft 21 can rotate more smoothly, and at the same time, the first output rotating plate 31 is separated from the top of the second housing 20 by the limiting portion 36, thereby reducing the friction of the first output rotating plate 31, reducing energy loss, and also making the rotation smoother.

[0053] like Figures 10 to 15 As shown, as another preferred scheme of this embodiment, the transmission assembly 3 includes a second sun gear 40 arranged on the rotor shaft 13, a second output rotating plate 41 arranged on the second sun gear 40 and relatively rotatingly matched with the second sun gear 40, the output shaft 21 is relatively fixedly arranged on the second output rotating plate 41, and also includes a plurality of lower planetary gears 42 rotatably arranged at the bottom of the second housing 20 and meshing with the second sun gear 40, a plurality of upper planetary gears 43 rotatably arranged at the bottom of the second output rotating plate 41 and meshing with the second sun gear 40, and a differential ring gear assembly 44 rotatably arranged in the second housing 20 and cooperating with the lower planetary gears 42 and the upper planetary gears 43 to decelerate the upper planetary gears 43 so as to generate a speed difference between the upper planetary gears 43 and the second sun gear 40.

[0054] In this embodiment, the rotor shaft 13 drives the second sun gear 40 to rotate, and the second sun gear 40 drives the lower planetary gear 42 to rotate. During the rotation of the lower planetary gear 42, the differential gear ring assembly 44 is driven to rotate, and the differential gear ring assembly 44 drives the upper planetary gear 43 to rotate. After the upper planetary gear 43 is decelerated by the differential gear ring assembly 44, there is a speed difference between the upper planetary gear 43 and the second sun gear 40. The speed of the second sun gear 40 will be greater than the rotation of the upper planetary gear 43, and the second sun gear 40 will drive the upper planetary gear 43 to rotate around itself, that is, the upper planetary gear 43 will revolve around the second sun gear 40 during the rotation, further reducing speed. The upper planetary gear 43 is arranged at the bottom of the second output rotating plate 41, so the upper planetary gear 43 can drive the second output rotating plate 41 to rotate, and the second output rotating plate 41 drives the output shaft 21 to rotate, so as to achieve the purpose of reducing speed and increasing torque.

[0055] In this embodiment, the difference from the first transmission component 3 is that this example uses a differential gear ring component 44 to slow down the upper planetary gear 43, so that there is a speed difference between the upper planetary gear 43 and the second sun gear 40, so that the upper planetary gear 43 can be driven to revolve and then drive the second output rotating plate 41 to rotate, and the second output rotating plate 41 further drives the output shaft 21 to rotate. The first transmission component 3 directly drives the first planetary gear 32 and the pinion gear 33 to move together. Since the pinion gear 33 is smaller than the first planetary gear 32, the pinion gear 33 will rotate around the inner ring gear 34 and then drive the first output rotating plate 31 to rotate, and further drive the output shaft 21 to rotate. No matter which transmission method is used for the two, they can be arranged in the second housing 20 to cooperate with the drive unit 1, and compared with traditional reduction motors, they have the effects of small size and stable transmission.

[0056] As a further solution of this embodiment, the differential gear ring assembly 44 is provided with a gear ring sleeve 45 rotatably connected thereto. After the gear ring sleeve 45 is provided, the differential gear ring assembly 44 can rotate more smoothly.

[0057] As a further solution of this embodiment, the differential ring gear assembly 44 includes a lower ring gear 46 meshing with the lower planetary gear 42 and an upper ring gear 47 meshing with the upper planetary gear 43. The upper ring gear 47 is arranged to move synchronously with the lower ring gear 46, and the upper ring gear 47 has the same module as the lower ring gear 46, and the number of teeth of the upper ring gear 47 is less than the number of teeth of the lower ring gear 46.

[0058] In this embodiment, the differential gear ring assembly 44 is divided into two parts, namely, an upper gear ring 47 and a lower gear ring 46, so that the difficulty of production can be reduced, and the upper gear ring 47 has the same module as the lower gear ring 46, and the number of teeth of the upper gear ring 47 is less than the number of teeth of the lower gear ring 46. Correspondingly, the module of the upper planetary gear 43 is the same as the module of the lower planetary gear 42, and the number of teeth of the upper planetary gear 43 is the same as the number of teeth of the lower planetary gear 42. In this way, after being transmitted by the differential gear ring assembly 44, the upper planetary gear 43 can be decelerated, so that there is a speed difference between the upper planetary gear 43 and the second sun gear 40.

Claims

1. A modular micro reduction motor with optional output torque in production, characterized in that The invention comprises a drive unit (1) and a transmission unit (2) independently arranged outside the drive unit (1), wherein the drive unit (1) comprises a first housing (10), a stator assembly (11) and a rotor assembly (12) arranged in the first housing (10) and cooperating with each other, wherein the rotor assembly (12) comprises a rotor shaft (13) extending out of the first housing (10); the transmission unit (2) comprises a second housing (20), a transmission assembly (3) arranged in the second housing (20), and an output shaft (21) extending out of the second housing (20) and used for connecting a load, wherein the second housing (20) is relatively fixedly connected to the first housing (10), the rotor shaft (13) extends into the second housing (20) and is transmission-cooperatedly connected to the output shaft (21) through the transmission assembly (3), and the axial height of the second housing (20) is less than the axial height of the first housing (10), so that the transmission unit (2) has a flat structure.

2. A modular micro reduction motor with optional output torque in production according to claim 1, characterized in that The upper end of the inner wall of the first shell (10) is upwardly protruding and formed with a groove (14), in which a first shaft sleeve (15) is embedded, and the rotor shaft (13) is rotatably matched with the first shaft sleeve (15).

3. A modular micro reduction motor with optional output torque in production according to claim 2, characterized in that The first shaft sleeve (15) is made of copper or nylon.

4. A modular micro reduction motor with selectable output torque in production according to claim 1, characterized in that The first shell (10) and the second shell (20) have the same diameter.

5. A modular micro reduction motor with selectable output torque in production according to claim 1, characterized in that The connection between the second shell (20) and the first shell (10) is achieved by riveting or by providing a countersunk hole (16) at the bottom of the second shell (20) and locking the countersunk hole (16) with a countersunk screw to connect with the first shell (10).

6. A modular micro reduction motor with selectable output torque in production according to claim 1, characterized in that The transmission assembly (3) comprises a first sun gear (30) arranged on a rotor shaft (13) and a first output rotating plate (31) arranged on the first sun gear (30) and rotatably matched with the first sun gear (30), and also comprises a plurality of first planetary gears (32) rotatably arranged at the bottom of the first output rotating plate (31) and meshing with the first sun gear (30), a pinion gear (33) moving with the first planetary gear (32) being arranged at the bottom, an inner gear ring (34) for the rotor shaft (13) to pass through and meshing with the pinion gear (33) being formed at the bottom of the second housing (20), and the output shaft (21) being relatively fixedly arranged on the first output rotating plate (31).

7. A modular micro reduction motor with selectable output torque in production according to claim 6, characterized in that The transmission assembly (3) further comprises a second shaft sleeve (35) arranged on the upper part of the second housing (20), and the second shaft sleeve (35) is rotatably connected to the second housing (20), the output shaft (21) passes through the second shaft sleeve (35) and is fixedly connected relative to the second shaft sleeve (35), and a limiting portion (36) for separating the first output rotating plate (31) from the top of the second housing (20) is formed on the outer side of the lower end of the second shaft sleeve (35) along the circumferential direction.

8. A modular micro reduction motor with selectable output torque in production according to claim 1, characterized in that The transmission assembly (3) comprises a second sun gear (40) arranged on the rotor shaft (13), a second output rotating plate (41) arranged on the second sun gear (40) and relatively rotatably matched with the second sun gear (40), the output shaft (21) being relatively fixedly arranged on the second output rotating plate (41), and further comprising a plurality of lower planetary gears (42) rotatably arranged at the bottom of the second housing (20) and meshing with the second sun gear (40), a plurality of upper planetary gears (43) rotatably arranged at the bottom of the second output rotating plate (41) and meshing with the second sun gear (40), and a differential gear ring assembly (44) rotatably arranged in the second housing (20) and matching with the lower planetary gears (42) and the upper planetary gears (43) to reduce the speed of the upper planetary gears (43) so as to generate a speed difference between the upper planetary gears (43) and the second sun gear (40).

9. A modular micro reduction motor with selectable output torque in production according to claim 8, characterized in that The outer shell of the differential gear ring assembly (44) is provided with a gear ring sleeve (45) which is rotatably connected thereto.

10. A modular micro reduction motor with selectable output torque in production according to claim 8, characterized in that The differential ring gear assembly (44) comprises a lower ring gear (46) meshing with the lower planetary gear (42) and an upper ring gear (47) meshing with the upper planetary gear (43). The upper ring gear (47) and the lower ring gear (46) are arranged to move together, and the upper ring gear (47) and the lower ring gear (46) have the same module, and the number of teeth of the upper ring gear (47) is less than the number of teeth of the lower ring gear (46).

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