Planetary gear motor

Abstract

The utility model discloses a planetary reduction motor, which comprises a motor body and a planetary reduction device, the motor body comprises a motor front cover, and a motor shaft, a stator assembly and a rotor assembly which are installed on the motor front cover. The planetary reduction gear comprises a gear ring, a box body flange, a planetary gear, a sun gear and a center frame; the center frame is of an integrated structure, assembling errors and manufacturing errors can be reduced, and product reliability is improved; the center frame is in butt joint with the box body flange through the first deep groove ball bearing and the second deep groove ball bearing, the double-bearing structure can keep stable operation in the application scene of large axial stress, abrasion of a planetary gear, a sun gear and a gear ring is reduced, noise generated when the planetary reduction gear operates is lowered, and the service life is prolonged; in addition, the boss is arranged on the surface of the center frame to stop the inner ring of the first deep groove ball bearing, and the axial stress of the center frame is increased.

Description

Technical Field

[0001] This utility model relates to the field of geared motor technology, and more specifically, to a planetary geared motor. Background Technology

[0002] Planetary geared motors are widely used industrial products that can reduce motor speed while increasing output torque. They are characterized by small size, high output torque, and high efficiency. However, existing planetary geared motors have separate planetary carriers and output shafts. During production and assembly, manufacturing and assembly errors are unavoidable, leading to lower motor reliability and higher noise and vibration. Furthermore, the single-bearing structure of planetary geared motors is prone to planetary carrier wobbling in applications with high axial forces, causing abnormal wear on the planetary gears, sun gear, and ring gear, ultimately resulting in increased gear noise and shortened gear lifespan. Utility Model Content

[0003] This utility model provides a planetary geared motor to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: a planetary geared motor, including a motor body and a planetary gear reduction device; the motor body includes a motor front cover, and a motor shaft, stator assembly and rotor assembly mounted on the motor front cover; the planetary gear reduction device includes a gear ring, a housing flange, planetary gears, a sun gear and a center frame;

[0004] The motor front cover, the gear ring, and the housing flange are bolted together as a whole; a first deep groove ball bearing is provided between the housing flange and the gear ring, and a second deep groove ball bearing is provided inside the housing flange; the center frame is an integrated structure, which includes a turntable and a rotating shaft, the turntable is connected to the housing flange through the first deep groove ball bearing, and the rotating shaft is connected to the flange housing through the second deep groove ball bearing; the planetary gear is rotatably mounted on the turntable and meshes with the gear ring; the sun gear is connected to the motor shaft and meshes with the planetary gear.

[0005] Preferably, the surface of the turntable is provided with an annular boss, which is configured to cooperate with the inner ring of the first deep groove ball bearing and is used to restrict the axial movement of the inner ring of the first deep groove ball bearing.

[0006] Preferably, the housing flange is provided with a first groove, the gear ring is provided with a second groove that mates with the first groove, and the first deep groove ball bearing is installed between the first groove and the second groove.

[0007] Preferably, the motor body adopts an outer rotor and inner stator structure; the motor shaft is rotatably mounted on the front cover of the motor, and the stator assembly is fixedly mounted on the front cover of the motor; the rotor assembly is connected to the motor shaft and is configured to cooperate with the stator assembly.

[0008] Preferably, the motor front cover includes a cover plate and a column; the cover plate is mated with the gear ring, the column is provided with a first bearing, the cover plate is provided with a second bearing, and the motor shaft is connected to the first bearing and the second bearing respectively; the stator assembly is sleeved on the outside of the column.

[0009] Preferably, the rotor assembly includes an end cover, a housing, and a plurality of magnets; the center of the end cover is connected to the motor shaft, and the periphery is connected to the housing; the magnets are disposed between the end cover and the housing.

[0010] Preferably, the end cover includes an annular portion and multiple blades, the annular portion surrounding the stator assembly; the multiple blades are arranged in a circumferential array on the annular portion; the annular portion is connected to the housing.

[0011] Preferably, the motor front cover is provided with a plurality of threaded holes, the gear ring is provided with a through groove that mates with the threaded holes, the housing flange is provided with a countersunk threaded hole that mates with the through groove, and a bolt is provided on the countersunk threaded hole, the bolt passes through the corresponding through groove and connects to the corresponding threaded hole.

[0012] Preferably, there are three planetary gears, which are equally spaced on the turntable; each planetary gear is provided with a pin and is rotatably connected to the turntable through the pin.

[0013] Preferably, the end of the housing flange is provided with a UPH oil seal, which is used to prevent the lubricating grease inside the housing flange from leaking out.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: The central frame of this utility model transforms the traditional separate structure of the planetary carrier and output shaft into an integrated structure, reducing assembly and manufacturing errors, improving product reliability, and simultaneously reducing noise and vibration. The central frame is connected to the housing flange via a first and a second deep groove ball bearing. This dual-bearing structure ensures stable operation in applications with high axial forces, reducing wear on the planetary gears, sun gear, and gear ring, lowering noise during planetary reduction gear operation, and extending service life. Furthermore, the surface of the central frame is provided with bosses to stop the inner ring of the first deep groove ball bearing, which helps increase the axial force on the central frame, preventing displacement or damage due to excessive axial force and ensuring stable operation of the reduction system. The motor body of this utility model adopts an external rotor and internal stator structure, which can generate a large torque, enabling the planetary reduction gear to provide strong torque at the output end, meeting the needs of applications with high torque requirements. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the planetary geared motor according to an embodiment of the present utility model;

[0016] Figure 2 This is another structural view of the planetary geared motor according to an embodiment of the present invention;

[0017] Figure 3 This is another structural view of the planetary geared motor according to an embodiment of the present invention;

[0018] Figure 4 This is a top view of the planetary geared motor according to an embodiment of the present utility model;

[0019] Figure 5 This is a front view of the planetary geared motor according to an embodiment of the present utility model;

[0020] Figure 6 This is a cross-sectional view of the planetary geared motor according to an embodiment of the present utility model;

[0021] Figure 7 This is an exploded view of the planetary geared motor according to an embodiment of the present invention;

[0022] exist Figures 1 to 7 In the diagram, the correspondence between the component names and the drawing numbers is as follows:

[0023] 1--Motor body, 11--Motor front cover, 111--Cover plate, 112--Column, 12--Motor shaft, 13--Stator assembly, 14--Rotor assembly, 141--End cover, 1411--Annular part, 1412--Blade, 142--Housing, 143--Magnet, 15--First bearing, 16--Second bearing, 2--Planetary reducer, 21--Gear ring, 211--Second groove, 22--Box flange, 221--First groove, 23--Planetary gear, 24--Sun gear, 25--Center frame, 251--Turntable, 252--Shaft, 253--Boss, 26--First deep groove ball bearing, 27--Second deep groove ball bearing, 28--UPH oil seal. Detailed Implementation

[0024] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0025] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Please refer to Figures 1 to 7 This utility model provides a planetary geared motor, including a motor body 1 and a planetary gear reducer 2; the motor body 1 includes a motor front cover 11, and a motor shaft 12, a stator assembly 13 and a rotor assembly 14 mounted on the motor front cover 11; the planetary gear reducer 2 includes a gear ring 21, a housing flange 22, planetary gears 23, a sun gear 24 and a center frame 25.

[0028] The motor front cover 11, the gear ring 21, and the housing flange 22 are bolted together to form a whole. A first deep groove ball bearing 26 is provided between the housing flange 22 and the gear ring 21, and a second deep groove ball bearing 27 is provided inside the housing flange 22. The center frame 25 is an integrated structure, which includes a turntable 251 and a rotating shaft 252. The turntable 251 is connected to the housing flange 22 through the first deep groove ball bearing 26, and the rotating shaft 252 is connected to the flange housing through the second deep groove ball bearing 27. The planetary gear 23 is rotatably mounted on the turntable 251 and meshes with the gear ring 21. The sun gear 24 is connected to the motor shaft 12 and meshes with the planetary gear 23.

[0029] In this embodiment of the invention, the motor front cover 11, the gear ring 21, and the housing flange 22 are bolted together to form a whole, facilitating installation and debugging. The stator assembly 13, motor shaft 12, and rotor assembly 14 are respectively mounted on the motor front cover 11, resulting in a more compact overall structure. The gear ring 21 is a hollow cylindrical structure with a rack on its inner wall, which meshes with the planetary gears 23. The planetary gears 23 are mounted on the center frame 25 via shafts or connectors, and mesh with the sun gear 24 and the gear ring 21 respectively. Power is transmitted from the motor shaft 12, driving the sun gear 24 to rotate. The center frame 25 serves as a support component, used to mount and support the planetary gears 23, enabling them to revolve and rotate around the sun gear 24. Multiple planetary gears 23 are provided, evenly distributed around the sun gear 24, meshing simultaneously with both the sun gear 24 and the gear ring 21. The sun gear 24, located at the center, is the driving gear, receiving power from the motor shaft 12. The ring gear 21 is fixed and meshes with the planetary gear 23. When the sun gear 24 rotates, it drives the planetary gear 23 to rotate on its own axis and revolve around the sun gear 24. The revolve of the planetary gear 23 drives the central frame 25 to rotate, outputting power. Because the planetary gear 23 has a different number of teeth than the sun gear 24 and the ring gear 21, the gear ratio achieves the effect of speed reduction and torque increase, thereby converting the input high-speed, low-torque into the output low-speed, high-torque.

[0030] Compared to traditional planetary gearboxes, this embodiment has the following advantages:

[0031] First, the integrated center carrier 25 structure: the traditional planetary carrier and output shaft are integrated into a single center carrier 25. The turntable 251 on top of the center carrier 25 is used to mount the planetary gears 23, and the rotating shaft 252 is used for power output. This integrated mechanism effectively reduces assembly and manufacturing errors, improves product reliability, and reduces noise and vibration. Simultaneously, the integrated structure enhances the overall strength and rigidity of the center carrier 25, making it less prone to deformation when subjected to complex loads during planetary gear 23 transmission, thus ensuring the accuracy and stability of the planetary gear 23 transmission.

[0032] Secondly, a double deep groove ball bearing structure is adopted; a first deep groove ball bearing 26 is installed between the housing flange 22 and the gear ring 21, and a second deep groove ball bearing 27 is installed inside the housing flange 22. The deep groove ball bearings can withstand radial loads and a certain axial load, providing good support for the turntable 251 and shaft 252 of the center frame 25. This allows the turntable 251 and shaft 252 to rotate smoothly with low friction, reducing energy loss, improving transmission efficiency, and also reducing noise and vibration during operation. The double bearing design can better distribute the load, improve the overall structure's ability to withstand forces in different directions, and enhance structural stability. The double bearing structure can maintain stable operation in applications with high axial force, reduce wear on the planetary gear 23, sun gear 24, and gear ring 21, reduce noise during planetary reduction gear 2 operation, prevent component deformation or damage due to uneven force distribution, and extend the service life of the equipment.

[0033] Secondly, the integrated design of the motor front cover 11, gear ring 21, and housing flange 22; the motor front cover 11, gear ring 21, and housing flange 22 are bolted together as a whole. This connection method provides a high-strength mechanical connection, ensuring that there is no relative displacement between the various components during motor operation, guaranteeing the stability and reliability of the entire transmission system, and effectively withstanding various forces and torques generated during motor operation and deceleration. The integrated connection structure allows these components to be operated as a whole during installation and disassembly, reducing the steps of individual component installation and debugging, improving installation efficiency, and facilitating overall inspection and replacement during maintenance, thus reducing maintenance difficulty. At the same time, the entire structure is more compact, which can better control the size of the motor.

[0034] The working process of this utility model is as follows: the stator assembly 13 and the rotor assembly 14 on the motor body 1 cooperate to drive the motor shaft 12. The motor shaft 12 acts on the planetary gear 23 through the sun gear 24. The planetary gear 23 acts on the central frame 25 during the cooperation with the gear ring 21, so that the central frame 25 rotates in the housing flange 22, thereby realizing the output of power.

[0035] Preferably, the surface of the turntable 251 is provided with an annular boss 253. The boss 253 is configured to cooperate with the inner ring of the first deep groove ball bearing 26 and is used to restrict the axial movement of the inner ring of the first deep groove ball bearing 26. With the above structural configuration, the annular boss 253 on the surface of the turntable 251 stops the inner ring of the first deep groove ball bearing 26, increasing the axial force on the output shaft. The force is more than 30 times that of a single bearing structure, enabling the equipment to withstand greater axial forces and making it suitable for working conditions with strong axial loads. By restricting the axial movement of the bearing inner ring with the boss 253, the axial movement of the bearing during operation is reduced, making the planetary geared motor operate more stably.

[0036] Preferably, the housing flange 22 is provided with a first groove 221, and the gear ring 21 is provided with a second groove 211 that mates with the first groove 221. The first deep groove ball bearing 26 is installed between the first groove 221 and the second groove 211. In this embodiment, the first groove 221 on the housing flange 22 and the second groove 211 inside the gear ring 21 cooperate with each other, providing a precise installation position for the first deep groove ball bearing 26. This ensures that the bearing is in the correct position after installation, and accurately guarantees the relative positional relationship between the bearing, the housing flange 22, and the gear ring 21. This, in turn, ensures the assembly accuracy of each component in the entire transmission system, which is beneficial to improving the transmission efficiency and operational stability of the planetary gear motor. The first deep groove ball bearing 26 is installed between the two grooves, which is equivalent to being nested in a relatively fixed space. This structure can effectively limit the radial and axial movement of the bearing, making the bearing more stable during operation and better able to withstand loads from different directions. This enhances the stability of the entire planetary gear motor structure and reduces the risk of component wear and failure caused by bearing displacement or shaking.

[0037] Preferably, the motor body 1 adopts an outer rotor and inner stator structure; the motor shaft 12 is rotatably mounted on the motor front cover 11, and the stator assembly 13 is fixedly mounted on the motor front cover 11; the rotor assembly 14 is connected to the motor shaft 12 and is configured to cooperate with the stator assembly 13. In this embodiment, the motor body 1 adopts an outer rotor and inner stator structure, that is, the rotor assembly 14 rotates outside the stator assembly 13. Since the rotor assembly 14 is on the outside, its diameter is larger, and a larger rotor radius means a larger lever arm, thereby generating greater torque. In addition, the rotor assembly 14 is on the outside, and when it rotates, it can drive the surrounding airflow, forming a natural air cooling effect, which is beneficial to improving the heat dissipation efficiency of the motor and extending the service life of the motor. Combined with the characteristic of the planetary reduction gear 2 providing a large resultant torque, this embodiment can provide very strong torque at the output end of the central frame 25, which can easily drive large load equipment and meet the application scenarios with high torque requirements. In this embodiment, the motor shaft 12, stator assembly 13 and rotor assembly 14 are mounted on the motor front cover 11, and the motor front cover 11 is connected to the gear ring 21 and the housing flange 22 as a whole, making the structure of the whole machine very compact and occupying little space, which is convenient for installation in equipment with limited space.

[0038] Preferably, the motor front cover 11 includes a cover plate 111 and a column 112; the cover plate 111 is mated with the gear ring 21, the column 112 is provided with a first bearing 15, the cover plate 111 is provided with a second bearing 16, and the motor shaft 12 is connected to the first bearing 15 and the second bearing 16 respectively; the stator assembly 13 is sleeved on the outside of the column 112. With the above structural arrangement, the column 112 is provided with the first bearing 15, the cover plate 111 is provided with the second bearing 16, and the motor shaft 12 is connected to these two bearings, forming a stable two-point support structure. This structure can accurately position the motor shaft 12, ensuring its coaxiality during rotation, reducing radial runout and axial movement of the motor shaft 12, and improving the stability and reliability of motor operation.

[0039] Preferably, the rotor assembly 14 includes an end cover 141, a housing 142, and a plurality of magnets 143; the center of the end cover 141 is connected to the motor shaft 12, and the periphery is connected to the housing 142; the magnets 143 are disposed between the end cover 141 and the housing 142.

[0040] Preferably, the end cover 141 includes an annular portion 1411 and multiple blades 1412. The annular portion 1411 surrounds the stator assembly 13. The multiple blades 1412 are arranged in a circumferential array on the annular portion 1411. The annular portion 1411 is connected to the housing 142. By adopting a circumferential array design of multiple blades 1412, during motor operation, the blades 1412 rotate with the motor rotor and can drive the surrounding airflow, accelerating the heat exchange process and making the heat dissipation effect more significant. This natural convection heat dissipation method does not require additional heat dissipation equipment, reducing costs and system complexity.

[0041] Preferably, the motor front cover 11 has several threaded holes, the gear ring 21 has through slots that mate with the threaded holes, and the housing flange 22 has countersunk threaded holes that mate with the through slots. Bolts are installed in the countersunk threaded holes, passing through the corresponding through slots and connecting to the corresponding threaded holes. Through this structural arrangement, the bolts mate with the countersunk threaded holes of the housing flange 22, then pass through the through slots on the gear ring 21 and connect to the threaded holes of the motor front cover 11. This threaded connection method ensures that the motor front cover 11, gear ring 21, and housing flange 22 are tightly fixed together, forming a stable overall structure. This structure can effectively withstand various forces and torques generated during motor operation, ensuring that no components loosen during long-term use and guaranteeing the stability and reliability of the planetary geared motor.

[0042] Preferably, three planetary gears 23 are provided, and the three planetary gears 23 are equally spaced on the turntable 251; each planetary gear 23 is provided with a pin and is rotatably connected to the turntable 251 through the pin. In this embodiment, the three planetary gears 23 distributed equally at intervals on the turntable 251 can evenly distribute the load among the planetary gears 23. During transmission, the force borne by each planetary gear 23 is relatively balanced, avoiding the situation where a single gear bears an excessive load, thereby improving the load-bearing capacity of the entire transmission system, enabling it to withstand greater torque and power.

[0043] Preferably, the end of the housing flange 22 is provided with a UPH oil seal 28, which is used to prevent the leakage of lubricating grease inside the housing flange 22. UPH is a commonly used sealing ring, a double-lip seal, whose lips can form a tight sealing contact with the shaft surface when the shaft rotates. By using a UPH oil seal to tightly fit with the housing flange 22 and related rotating parts, a reliable sealing barrier can be formed, effectively preventing the leakage of internal lubricating grease, ensuring a good lubrication environment inside the housing, reducing lubrication problems caused by grease leakage, and ensuring the normal operation of the equipment.

[0044] Compared with existing technologies, the beneficial effects of this utility model are as follows: The central frame of this utility model transforms the traditional separate structure of the planetary carrier and output shaft into an integrated structure, reducing assembly and manufacturing errors, improving product reliability, and simultaneously reducing noise and vibration. The central frame is connected to the housing flange via a first and a second deep groove ball bearing. This dual-bearing structure ensures stable operation in applications with high axial forces, reducing wear on the planetary gears, sun gear, and gear ring, lowering noise during planetary reduction gear operation, and extending service life. Furthermore, the surface of the central frame is provided with bosses to stop the inner ring of the first deep groove ball bearing, which helps increase the axial force on the central frame, preventing displacement or damage due to excessive axial force and ensuring stable operation of the reduction system. The motor body of this utility model adopts an external rotor and internal stator structure, which can generate a large torque, enabling the planetary reduction gear to provide strong torque at the output end, meeting the needs of applications with high torque requirements.

[0045] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A planetary reduction motor characterized by, The motor body (1) comprises a motor front cover (11), a motor shaft (12), a stator assembly (13) and a rotor assembly (14) installed on the motor front cover; the planetary reduction device comprises a gear ring (21), a box flange (22), a planetary gear (23), a sun gear (24) and a central frame (25); The motor front cover, the gear ring and the box flange are connected into a whole through bolts; the first deep groove ball bearing (26) is arranged between the box flange and the gear ring, and the second deep groove ball bearing (27) is arranged in the box flange; the central frame is an integrated structure, comprising a rotating disc (251) and a rotating shaft (252), the rotating disc is connected with the box flange through the first deep groove ball bearing, and the rotating shaft is connected with the flange box through the second deep groove ball bearing; the planetary gear is rotatably arranged on the rotating disc and is engaged with the gear ring; the sun gear is connected with the motor shaft and is engaged with the planetary gear.

2. The planetary reduction motor of claim 1, wherein, The surface of the rotating disc is provided with an annular structure boss (253), which is matched with the inner ring of the first deep groove ball bearing and is used for limiting the axial movement of the inner ring of the first deep groove ball bearing.

3. The planetary reduction motor of claim 1, wherein, The box flange is provided with a first groove (221), and the inside of the gear ring is provided with a second groove (211) matched with the first groove, and the first deep groove ball bearing is installed between the first groove and the second groove.

4. The planetary reduction motor of claim 1, wherein, The motor body adopts the structure of outer rotor and inner stator; the motor shaft is rotatably arranged on the motor front cover, the stator assembly is fixedly installed on the motor front cover; the rotor assembly is connected with the motor shaft and is arranged in cooperation with the stator assembly.

5. The planetary reduction motor of claim 4, wherein, The motor front cover comprises a cover plate (111) and a stand column (112); the cover plate is butted with the gear ring, the first bearing (15) is arranged in the stand column, the second bearing (16) is arranged in the cover plate, and the motor shaft is connected with the first bearing and the second bearing respectively; the stator assembly is sleeved on the outside of the stand column.

6. The planetary reduction motor of claim 4, wherein, The rotor assembly comprises an end cover (141), a casing (142) and a plurality of magnets (143); the center of the end cover is connected with the motor shaft, and the periphery is connected with the casing; the magnets are arranged between the end cover and the casing.

7. The planetary reduction motor of claim 6, wherein, The end cover comprises an annular part (1411) and a plurality of blades (1412), the annular part surrounds the stator assembly, and the plurality of blades are arranged in a circumferential array on the annular part; the annular part is connected with the casing.

8. The planetary reduction motor of claim 1, wherein, A plurality of threaded holes are arranged on the motor front cover, a through groove matched with the threaded holes is arranged on the gear ring, a countersunk screw hole matched with the through groove is arranged on the box flange, a bolt is arranged on the countersunk screw hole, the bolt passes through the corresponding through groove and is connected with the corresponding threaded hole.

9. The planetary reduction motor of claim 1, wherein, The planetary gear is provided with three, and the three planetary gears are equally spaced on the rotating disc; the planetary gear is provided with a pin shaft and is rotatably connected with the rotating disc through the pin shaft.

10. The planetary reduction motor of claim 1, wherein, An end of the housing flange is provided with a UPH oil seal (28) for preventing leakage of lubricating grease inside the housing flange.

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