Planetary gear reducer

Abstract

The utility model relates to a kind of planetary gear reducer, belong to the technical field of speed reducer. Including shell, output mechanism and multistage star wheel speed reduction mechanism, output mechanism includes output shaft, each star wheel speed reduction mechanism includes sun gear, planetary gear, star wheel axle and planet carrier, and cylindrical roller support is equipped between planetary gear and star wheel axle;The sun gear of primary star wheel speed reduction mechanism is keyed connection with the power shaft of motor, shell is equipped with shell internal gear ring, planet carrier is equipped with star carrier internal gear, star carrier internal gear of upper star wheel speed reduction mechanism is engaged with the sun gear of lower star wheel speed reduction mechanism, star wheel axle of N star wheel speed reduction mechanism is connected with output shaft. The utility model compact structure, it can realize wide range of speed reduction ratio, power transmission is stable, planetary gear, star wheel axle and cylindrical roller form integrated planetary gear bearing, can satisfy the requirement of bearing capacity, small space occupies, the speed reducer also has higher bearing capacity and smaller volume, application is more widely.

Description

Technical Field

[0001] This utility model relates to a planetary gear reducer, belonging to the field of reducer technology. Background Technology

[0002] Planetary gear reducers are widely used due to their high transmission accuracy and efficiency. However, single-stage transmission ratios are generally small, and high-ratio reducers require multi-stage cascade designs. Furthermore, current multi-stage planetary gear reducers commonly use existing bearings and planetary carriers with fixed planetary shafts at both ends, unnecessarily occupying too much axial space. This results in excessively long axial lengths, leading to low material utilization, high manufacturing costs, and a significant reduction in transmission rigidity and accuracy. Additionally, the excessive axial length of multi-stage planetary reducers makes installation impossible in many fields and applications, further limiting their widespread use. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a planetary gear reducer.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A planetary gear reducer includes a housing, an output mechanism disposed on the housing, and a multi-stage planetary gear reduction mechanism. The output mechanism includes an output shaft, and the multi-stage planetary gear reduction mechanism includes a first-stage planetary gear reduction mechanism, a second-stage planetary gear reduction mechanism, ... N-stage planetary gear reduction mechanisms. Each stage of the planetary gear reduction mechanism includes a sun gear, planetary gears, a planetary gear shaft, and a planet carrier. Cylindrical roller supports are provided between the planetary gears and the planetary gear shaft. The sun gear of the first-stage planetary gear reducer is keyed to the power shaft of the motor. The housing is provided with an internal gear ring that can mesh with the planetary gears. The inner wall of the planetary carrier is provided with an internal gear. The internal gear of the planetary carrier of the previous stage planetary gear reducer meshes with the sun gear of the next stage planetary gear reducer. The planetary gear shaft of the N-stage planetary gear reducer is connected to the output shaft.

[0005] The beneficial effects of this utility model are: compact structure, high transmission efficiency, and the ability to achieve a wide range of reduction ratios. The multi-stage planetary gear reduction mechanism makes power transmission smoother. At the same time, the planetary gears, planetary gear shafts, and cylindrical rollers form an integrated planetary gear bearing. The planetary gears serve as the outer ring of the bearing, and the planetary gear shafts serve as the inner ring of the bearing, which can meet the requirements of load-bearing capacity. Compared with the existing direct use of bearings, it occupies less space and reduces space usage. This reducer also has a high load-bearing capacity and a small size, making it more widely applicable.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, a roller support or a sliding bearing is provided between the output shaft and the housing.

[0008] The beneficial effect of adopting the above-mentioned further solution is that the output shaft and the housing can be supported by a single row of rollers, a double row of rollers, or a three-row of rollers. The output shaft, the housing, and the rollers located between them form an integrated bearing, with the housing as its outer ring and the output shaft as its inner ring. This can meet the load-bearing requirements, while the integration can save space and make the structure of the reducer more compact.

[0009] Furthermore, a thrust needle roller support or a sliding bearing is provided between the sun gears of adjacent star gear reduction mechanisms.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the sun gears of the existing adjacent star gear reduction mechanism are in direct contact with each other, resulting in severe wear on the sun gears and affecting their service life. By opening a raceway on the adjacent sun gears, the raceway can be set on one of the sun gears or formed between two sun gears. Multiple thrust needle rollers are set on the raceway through a cage to form an integrated thrust needle roller bearing, or a sliding bearing can be placed between the sun gears to isolate each sun gear, reduce wear between adjacent sun gears, and extend the service life of the sun gears.

[0011] Furthermore, the sun gear and the adjacent planet carrier are connected by full-tooth splines and / or half-tooth splines.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that the planet carrier and the sun gear can be engaged by a full-tooth spline, or by a half-tooth spline. In this way, the sun gear engages with the planet carrier through a half-tooth spline. The part of the sun gear that engages with the planet carrier is a half-tooth, which can form a step with the full-tooth parts of the other parts. The step can position the planet carrier and prevent the planet carrier from axially displacing.

[0013] Furthermore, the star wheel shaft and the planet carrier are interference-fitted; the star wheel shaft and the planet carrier are positioned by a snap ring; and / or the star wheel shaft and the planet carrier are connected by a partial protrusion and an interference fit.

[0014] The advantages of adopting the above-mentioned further solutions are that the star wheel shaft and the planetary carrier can be an interference fit. For example, for star wheel reduction mechanisms with relatively small forces, such as single-stage and two-stage star wheel reduction mechanisms, the star wheel shaft can be prevented from falling off the planetary carrier simply by using an interference fit. If space permits, a snap ring can be used for positioning. The star wheel shaft and the planetary carrier can also be positioned and fitted by a snap ring. Snap rings are relatively easy to disassemble, but they occupy slightly more space. For example, a four-stage star wheel reduction mechanism uses a snap ring to position the planetary carrier on the star wheel shaft. For places with limited installation space, a local protrusion can be set on the star wheel shaft to position the planetary carrier. The planetary carrier and the star wheel shaft are in an interference fit. For example, a three-stage star wheel reduction mechanism uses this positioning method.

[0015] Furthermore, the output mechanism also includes an output gear, which is disposed on the output end side of the output shaft, and the output gear is connected to the output shaft by a tapered interference fit or a spline.

[0016] The beneficial effects of adopting the above-mentioned further solutions are that the output gear can further improve the transmission efficiency and output torque of the reducer, making the power transmission smoother, reducing energy loss, and making the reducer more convenient and flexible in installation and use, and able to adapt to more different application scenarios and needs; the cone interference or spline can realize the connection and transmission between the output gear and the output shaft, avoiding the situation of the output gear loosening or falling off during the operation of the reducer, and improving the overall operating stability of the reducer.

[0017] Furthermore, it also includes a gear end cap connected to the output shaft, the gear end cap being capable of positioning the output gear on the output shaft.

[0018] The advantage of adopting the above-mentioned further solution is that by pressing the output gear onto the output shaft through the gear end cover, the situation of the output gear falling off during the operation of the reducer is reduced or even avoided.

[0019] Furthermore, a wear-resistant pad is provided between the planetary gear and the planet carrier.

[0020] The advantage of adopting the above-mentioned further solution is that the wear-resistant gasket can be made of non-metallic materials. This wear-resistant gasket is used to isolate the planetary gears and planet carrier, reducing or even eliminating friction between them, and providing a friction surface for the planetary gears.

[0021] Furthermore, the planetary gear is provided with a wheel positioning platform for positioning one end of the cylindrical roller, and the star wheel shaft is provided with a shaft positioning platform for positioning the other end of the cylindrical roller; and / or a rolling ring for positioning one end of the cylindrical roller and a retaining ring for positioning the other end of the cylindrical roller are provided between the planetary gear and the star wheel shaft.

[0022] The beneficial effects of adopting the above-mentioned further solutions are that the cylindrical rollers are supported between the star wheel shaft and the planetary gears, with the planetary gears as the outer rings and the star wheel shaft as the inner rings. The wheel positioning table and shaft positioning table can position both ends of the cylindrical rollers, ensuring that the cylindrical rollers are stably positioned between the star wheel shaft and the planetary gears after installation, preventing them from falling off during operation, thus improving the reliability and stability of the reducer. Alternatively, retaining rings and rolling rings can be used to position the cylindrical rollers, ensuring that they are stably positioned between the planetary gears and the star wheel shaft after installation, further improving the stability of the cylindrical rollers after installation, preventing them from falling off during operation, enhancing the smoothness of the reducer's operation and its service life. The outer side of the rolling rings is positioned by snap rings, simplifying the installation and disassembly process of the cylindrical rollers, facilitating subsequent reducer maintenance, and reducing maintenance costs.

[0023] Furthermore, it also includes a shaft end cap for positioning the output shaft on the housing, the shaft end cap being connected to the housing by locking bolts.

[0024] The advantages of adopting the above-mentioned further solution are that the shaft end cover can effectively position the output shaft, and the locking bolt connection can realize the connection between the shaft end cover and the housing, ensuring the firmness of the connection, while facilitating subsequent disassembly and maintenance.

[0025] Furthermore, the housing includes a front cover, a rear cover, and a box body disposed between the front cover and the rear cover. The inner wall of the box body is provided with the inner toothed ring, and the front cover, the rear cover, and the box body are respectively provided with mounting holes for installing fastening bolts.

[0026] The advantages of adopting the above-mentioned further solution are that it facilitates the installation and maintenance of various components inside the housing, and the setting of the mounting holes facilitates the assembly of the housing by fastening bolts, ensuring a tight fit between the components and further improving the stability and durability of the reducer.

[0027] Furthermore, the housing includes a front housing and a rear housing, with a housing spacer ring between the front housing and the rear housing, and the inner walls of the front housing and the rear housing are respectively provided with the inner toothed rings.

[0028] The beneficial effect of adopting the above-mentioned further solution is that the housing spacer ring can position the front and rear housings and the gear ring inside the housing, reducing housing deformation caused by long-term use or load changes, and ensuring the overall accuracy and stability of the planetary gear reducer.

[0029] Furthermore, the output shaft is provided with an oil drain hole, and the outlet of the oil drain hole is located on the outer end face of the output shaft.

[0030] The beneficial effect of adopting the above-mentioned further solution is that the reducer has a compact structure and the oil drain position is located at the end face of the output shaft of the reducer, which is more convenient than the existing oil drain position located on the side of the reducer. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the split structure of this utility model; Figure 3 This is a front view structural diagram of the external shape of this utility model; Figure 4 This is a three-dimensional structural diagram of the external shape of this utility model; Figure 5 This is a schematic diagram of the planetary gear and star gear shaft mating structure of the three-stage star gear reduction mechanism of this utility model; Figure 6 This is a schematic diagram of the sun gear structure of this utility model; In the diagram, 1. First-stage star gear reduction mechanism; 2. Second-stage star gear reduction mechanism; 3. Third-stage star gear reduction mechanism; 4. Fourth-stage star gear reduction mechanism; 5. Fifth-stage star gear reduction mechanism; 6. Sun gear; 7. Planet gears; 8. Star gear shaft; 9. Planet carrier; 10. Cylindrical roller; 11. Internal gear ring; 12. Output shaft; 13. Output gear; 14. Front cover; 15. Front housing; 16. Rear housing; 17. Rear cover; 19. Thrust needle roller; 20. Wheel positioning table; 21. Shaft positioning table; 22. Roller ring; 23. Retaining ring; 24. Snap ring; 25. Roller; 26. Wear-resistant gasket; 27. Gear end cover; 28. Partial protrusion; 29. ​​Oil drain hole; 30. Housing spacer ring. Detailed Implementation

[0032] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0033] like Figures 1-6 As shown, a planetary gear reducer includes a housing, an output mechanism mounted on the housing, and a multi-stage planetary gear reduction mechanism. The output mechanism includes an output shaft 12. The multi-stage planetary gear reduction mechanism includes a first-stage planetary gear reduction mechanism 1, a second-stage planetary gear reduction mechanism 2...N-stage planetary gear reduction mechanisms. Each stage of the planetary gear reduction mechanism includes a sun gear 6, planetary gears 7, a planetary gear shaft 8, and a planet carrier 9, as shown. Figure 6 As shown, a cylindrical roller 10 is provided between the planetary gear 7 and the planetary gear shaft 8 for support; The sun gear 6 of the first-stage planetary gear reducer 1 is keyed to the power shaft of the motor. The housing is provided with an internal gear ring 11 that can mesh with the planetary gear 7. The inner wall of the planetary carrier 9 is provided with an internal gear. The internal gear of the planetary carrier of the previous stage planetary gear reducer 1 meshes with the sun gear 6 of the next stage planetary gear reducer 1. The planetary gear shaft 8 of the N-stage planetary gear reducer is connected to the output shaft 12.

[0034] The output shaft 12 is supported by rollers 25 between it and the housing. Specifically, the output shaft and housing may have a single row of rollers 25. Figure 1 As shown, the bearing is supported by double-row rollers 25 or three-row rollers 25. The output shaft, housing, and rollers 25 located between them form an integrated bearing. The housing serves as its outer ring, and the output shaft serves as its inner ring. This design can meet the load-bearing requirements, while the integration saves space, making the structure of the reducer more compact.

[0035] Alternatively, a sliding bearing may be provided between the output shaft 12 and the housing.

[0036] A thrust needle roller bearing 19 or a sliding bearing is provided between the sun gears 6 of adjacent star gear reduction mechanisms. In existing star gear reduction mechanisms, the sun gears are in direct contact, resulting in severe wear and affecting their service life. To address this, a raceway can be created on adjacent sun gears. This raceway can be located on one of the sun gears or between two sun gears. Multiple thrust needle rollers are mounted on the raceway via cages to form an integrated thrust needle roller bearing 19. Alternatively, a sliding bearing can be placed between the sun gears to isolate them, reducing wear between adjacent sun gears and extending their service life.

[0037] The sun gear 6 and the adjacent planet carrier 9 are connected by a full-tooth spline and / or a half-tooth spline. The planet carrier and the sun gear can be engaged by a full-tooth spline, or alternatively by a half-tooth spline. Figure 6 As shown, the sun gear meshes with the planet carrier via a half-tooth spline. The part of the sun gear that meshes with the planet carrier uses a half-tooth spline, which forms a step with the full teeth of the other parts. The step can position the planet carrier and prevent axial displacement of the planet carrier. At the same time, the meshing spline also adopts an interference fit, which can further prevent axial displacement.

[0038] The star wheel shaft 8 and the planetary carrier 9 are interference-fitted; the star wheel shaft 8 and the planetary carrier 9 are positioned by a retaining ring 24; and / or the star wheel shaft 8 and the planetary carrier 9 are connected by a partial protrusion 28 and an interference fit. The star wheel shaft and the planetary carrier can have an interference fit. For example, in star wheel reduction mechanisms with relatively small forces, such as single-stage and two-stage star wheel reduction mechanisms, the interference fit can be used to prevent the star wheel shaft from falling off the planetary carrier. If space permits, a snap ring can be used for positioning. The star wheel shaft 8 and the planetary carrier 9 can also be positioned using a snap ring 24. Snap rings are easier to disassemble but take up slightly more space. For example, a snap ring is used in a four-stage star wheel reduction mechanism to position the planetary carrier on the star wheel shaft. In places with limited installation space, a local protrusion can be set on the star wheel shaft to position the planetary carrier. The planetary carrier and the star wheel shaft have an interference fit. For example, a three-stage star wheel reduction mechanism uses this positioning method. In practice, the principle of thermal expansion and contraction is used. The planetary carrier is heated, the star wheel shaft is slightly frozen, and then a press is used to press the star wheel shaft into the hole of the star carrier, thus achieving the fit between the planetary carrier and the star wheel shaft.

[0039] The output mechanism also includes an output gear 13, which is disposed on the output end side of the output shaft 12. The output gear 13 and the output shaft 12 are connected by a tapered interference fit or a spline. The output gear 13 can further improve the transmission efficiency and output torque of the reducer, making power transmission smoother, reducing energy loss, and making the reducer more convenient and flexible to install and use, adapting to more different application scenarios and needs. The tapered interference fit or spline can realize the connection and transmission between the output gear 13 and the output shaft 12, preventing the output gear 13 from loosening or falling off during the operation of the reducer, and improving the overall operating stability of the reducer.

[0040] It also includes a gear end cover 27 connected to the output shaft 12, which can position the output gear 13 on the output shaft 12. By pressing the output gear 13 onto the output shaft 12 through the gear end cover 27, the possibility of the output gear 13 falling off during the operation of the reducer is reduced or even avoided.

[0041] The multi-stage planetary gear reducer includes a first-stage planetary gear reducer 1, a second-stage planetary gear reducer 2, a third-stage planetary gear reducer 3, a fourth-stage planetary gear reducer 4, and a fifth-stage planetary gear reducer 5. The first-stage, second-stage, and third-stage planetary gear reducers 1, 2, and 3 each include three planetary gears 7, while the fourth-stage and fifth-stage planetary gear reducers 4 and 5 each include eight planetary gears 7. This planetary gear reducer employs a five-stage planetary gear reducer 5, providing a large transmission ratio to meet operational requirements. The close coordination between each stage of the planetary gear reducer effectively utilizes the internal space of the reducer.

[0042] The N-stage planetary gear reducer has a stepped structure for its planetary gear shaft, which supports the corresponding planetary gears and prevents components such as snap rings from causing wear on the planetary gears during rotation.

[0043] The star wheel shaft of the N-stage star wheel reduction mechanism is connected to the output shaft 12, and the front end of the output shaft 12 can serve as the planetary carrier of the N-stage star wheel reduction mechanism. Considering the large space available for the N-stage star wheel reduction mechanism, the output shaft and the star wheel shaft can be directly connected by bolts.

[0044] The planetary gear 7 is provided with a wheel positioning platform 20 for positioning one end of the cylindrical roller 10, and the planetary gear shaft 8 is provided with a shaft positioning platform 21 for positioning the other end of the cylindrical roller 10; and / or a rolling ring 22 for positioning one end of the cylindrical roller 10 and a retaining ring 23 for positioning the other end of the cylindrical roller 10 are provided between the planetary gear and the planetary gear shaft. The cylindrical roller 10 is supported between the planetary gear shaft 8 and the planetary gear 7, with the planetary gear 7 as the outer ring and the planetary gear shaft 8 as the inner ring. The wheel positioning platform 20 and the shaft positioning platform 21 can position both ends of the cylindrical roller 10. After installation, the cylindrical roller 10 can be stably positioned between the planetary gear shaft 8 and the planetary gear 7, and will not fall off during operation, thus improving the reliability and stability of the reducer. Alternatively, retaining ring 23 and rolling ring 22 can be used to position the cylindrical roller 10, ensuring that the cylindrical roller 10 can be stably positioned between the planetary gear 7 and the star gear shaft 8 after installation. This further improves the stability of the cylindrical roller 10 after installation, prevents the cylindrical roller 10 from falling off during operation, and enhances the smoothness of the reducer's operation and service life. The outer side of the rolling ring 22 is positioned by a snap ring, which simplifies the installation and disassembly process of the cylindrical roller 10, facilitates subsequent maintenance of the reducer, and reduces maintenance costs.

[0045] A wear-resistant gasket 26 is provided between the planetary gear 7 and the planet carrier 9. The wear-resistant gasket 26 can be made of non-metallic material. The wear-resistant gasket 26 is used to isolate the planetary gear 7 and the planet carrier 9, reduce or even avoid friction between the two, and provide a friction surface for the planetary gear 7.

[0046] It also includes a shaft end cap for positioning the output shaft 12 on the housing, the shaft end cap being connected to the rear cover 17 of the housing by locking bolts. The shaft end cap can effectively position the output shaft 12, and the locking bolt connection enables the shaft end cap to be connected to the housing, ensuring a firm connection and facilitating subsequent disassembly and maintenance.

[0047] The housing includes a front cover 14, a rear cover 17, and a box body disposed between the front cover 14 and the rear cover 17. An internal gear ring 11 is provided on the inner wall of the box body. The front cover 14, rear cover 17, and box body are each provided with mounting holes for installing fastening bolts. This facilitates the installation and maintenance of various components within the housing. The mounting holes facilitate assembly of the housing using fastening bolts, ensuring a tight fit between components and further improving the stability and durability of the reducer.

[0048] The housing includes a front housing 15 and a rear housing 16, with a housing spacer 30 between the front housing 15 and the rear housing 16. The inner walls of the front housing 15 and the rear housing 16 are respectively provided with the internal gear ring 11. The housing spacer can position the front and rear housings 16 and the internal gear ring 11, reducing housing deformation caused by long-term use or load changes, and ensuring the overall accuracy and stability of the planetary gear reducer.

[0049] The output shaft is provided with an oil drain hole 29, and the outlet of the oil drain hole 29 is located on the outer end face of the output shaft. Figure 3 The gear end cover in the original design did not show an oil drain hole; after the gear end cover is installed, an oil drain hole is provided at the corresponding position on the gear end cover. This reducer has a compact structure, and the oil drain position is located at the end face of the reducer's output shaft, i.e., at the bottom of the reducer. Compared with the existing oil drain position located on the side of the reducer, oil draining is more convenient.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A planetary gear reducer, characterized in that, It includes a housing, an output mechanism mounted on the housing, and a multi-stage star gear reduction mechanism. The output mechanism includes an output shaft (12), and the multi-stage star gear reduction mechanism includes a first-stage star gear reduction mechanism (1), a second-stage star gear reduction mechanism (2)...N-stage star gear reduction mechanism. Each stage of the star gear reduction mechanism includes a sun gear (6), planet gears (7), a star gear shaft (8), and a planet carrier (9). The planet gears (7) and the star gear shaft (8) are supported by cylindrical rollers (10). The sun gear (6) of the first-stage star gear reduction mechanism (1) is keyed to the power shaft of the motor. The housing is provided with an internal gear ring (11) that can mesh with the planet gear (7). The inner wall of the planet carrier (9) is provided with a star carrier internal gear. The star carrier internal gear of the upper-stage star gear reduction mechanism (1) meshes with the sun gear (6) of the lower-stage star gear reduction mechanism (1). The star gear shaft (8) of the N-stage star gear reduction mechanism is connected to the output shaft (12).

2. The planetary gear reducer according to claim 1, characterized in that, The output shaft (12) is provided with a roller (25) support or a sliding bearing between it and the housing.

3. The planetary gear reducer according to claim 1, characterized in that, A thrust needle roller (19) support or a sliding bearing is provided between the sun gears of the adjacent star gear reduction mechanism.

4. The planetary gear reducer according to claim 1, characterized in that, The sun gear (6) and the adjacent planet carrier (9) are connected by full-tooth splines and / or half-tooth splines.

5. The planetary gear reducer according to claim 1, characterized in that, The star wheel shaft (8) and the planet carrier (9) are interference-fitted; the star wheel shaft (8) and the planet carrier (9) are positioned by a snap ring (24); and / or the star wheel shaft (8) and the planet carrier (9) are connected by a partial protrusion (28) and an interference fit.

6. The planetary gear reducer according to claim 1, characterized in that, The output mechanism also includes an output gear (13), which is disposed on the output end side of the output shaft (12). The output gear (13) and the output shaft (12) are connected by a tapered interference fit or a spline.

7. The planetary gear reducer according to any one of claims 1-6, characterized in that, A wear-resistant pad (26) is provided between the planetary gear (7) and the planet carrier (9).

8. The planetary gear reducer according to any one of claims 1-6, characterized in that, The planetary gear (7) is provided with a wheel positioning platform (20) for positioning one end of the cylindrical roller (10), and the star wheel shaft (8) is provided with a shaft positioning platform (21) for positioning the other end of the cylindrical roller (10); and / or a rolling ring (22) for positioning one end of the cylindrical roller (10) and a retaining ring (23) for positioning the other end of the cylindrical roller (10) are provided between the planetary gear and the star wheel shaft.

9. The planetary gear reducer according to any one of claims 1-6, characterized in that, The housing includes a front cover (14), a rear cover (17), and a box body disposed between the front cover (14) and the rear cover (17). The inner wall of the box body is provided with the inner toothed ring (11). The front cover (14), the rear cover (17), and the box body are respectively provided with mounting holes for installing fastening bolts.

10. The planetary gear reducer according to any one of claims 1-6, characterized in that, The output shaft (12) is provided with an oil drain hole (29), and the outlet of the oil drain hole (29) is located on the outer end face of the output shaft (12).

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