Planetary transmission assembly, gear box and wind turbine generator system

Abstract

This disclosure relates to a planetary transmission assembly, a gearbox, and a wind turbine generator set. The gearbox includes: a housing; a planetary carrier disposed within the housing, one end of which has a support ring and a shoulder adjacent to the support ring. The support ring forms an opening for the sun gear to enter, and the shoulder protrudes from the outer circumferential surface of the support ring; a bearing disposed between the support ring and the housing, through which the planetary carrier rotates relative to the housing; and a retaining ring sandwiched between the bearing and the shoulder, the portion of which protrudes from the outer circumferential surface of the shoulder. The technical solution provided by this disclosure allows for a smaller shoulder height, enabling a smaller planetary gear profile and improving material utilization of the planetary gears.

Description

Technical Field

[0001] This disclosure relates to the technical field of wind power equipment, and in particular to a planetary transmission assembly, gearbox, and wind turbine generator set. Background Technology

[0002] Wind turbine gearboxes generally adopt a multi-stage planetary transmission structure. The driving element of each stage of the planetary transmission structure is a planetary carrier. The bearings are set on the planetary carrier and fixed to the gearbox body to support the planetary carrier.

[0003] In order for the planetary gears to mesh with the sun gear, the wall thickness of the planetary gears should not be less than the sum of the bearing support wall thickness and the bearing shoulder height. Therefore, in the design, it is necessary to ensure sufficient planetary gear wall thickness to ensure that the bearing has sufficient side shoulder height and inner ring support wall thickness. However, this restricts the size design of the planetary gears, resulting in a large amount of the planetary gears not being used for load bearing, which is not conducive to improving the material utilization rate of the planetary gears and affects the torque density. Utility Model Content

[0004] The purpose of this disclosure is to provide a planetary transmission assembly, gearbox, and wind turbine generator set that can have a small shoulder height, so that the thickness of the planetary gears can be reduced, thereby improving the material utilization rate of the planetary gears.

[0005] According to one aspect of this disclosure, a gearbox is provided, the gearbox comprising: a housing; a planetary carrier disposed within the housing, one end of the planetary carrier having a support ring and a shoulder disposed adjacent to the support ring, the support ring forming an opening for a sun gear to enter, the shoulder protruding from the outer peripheral surface of the support ring; a bearing disposed between the support ring and the housing, the planetary carrier rotating relative to the housing via the bearing; and a retaining ring sandwiched between the bearing and the shoulder, the retaining ring partially protruding from the outer peripheral surface of the shoulder.

[0006] The technical solution disclosed herein provides a retaining ring that protrudes slightly from the outer circumference of the shoulder between the bearing and the shoulder. This retaining ring supports the end face of the bearing, thus meeting the end face support requirements without increasing the height of the shoulder. In this way, by reducing the height of the shoulder, while still providing support for the bearing's end face and the inner diameter mounting portion, the thickness of the planetary gear's profile can be increased, avoiding excessive material buildup and improving the material utilization and torque density of the planetary gear.

[0007] Optionally, the wall thickness of the retaining ring is not less than half the wall thickness of the bearing.

[0008] The above solution ensures that the retaining ring has sufficient support area on the bearing end face, avoiding uneven local stress on the bearing end face and large deformation that could affect bearing operation.

[0009] Optionally, the sun gear is installed inside the planetary carrier through the opening and is rotatably connected to the planetary carrier; the gearbox also includes a plurality of planetary gears, which are rotatably connected to the planetary carrier and mesh with the sun gear, and the shoulder is located between the bearing and the planetary gears.

[0010] With the above solution, the shoulder is located between the bearing and the planetary gear. The shoulder and the retaining ring located between the shoulder and the bearing can be used to limit the axial movement of the planetary gear and the bearing, prevent axial movement, and simplify the structure.

[0011] Optionally, the planetary carrier has a first mounting space and a plurality of second mounting spaces, wherein the first mounting space communicates with the opening and is used to mount the sun gear; the plurality of second mounting spaces are arranged in a ring array about the axis of the planetary carrier, the second mounting spaces communicate with the first mounting space and penetrate the outer peripheral surface of the planetary carrier, and the plurality of planet gears are rotatably connected in the plurality of second mounting spaces respectively.

[0012] With the above design, the sun gear is built into the first mounting space of the planetary carrier, and the planetary gear ring array is in the second mounting space on the outside, forming a concentric circle layout from the center to the outer periphery, without requiring additional axial length. At the same time, the second mounting space extends through the outer periphery of the planetary carrier, eliminating the need to reserve complex closed cavities inside the planetary carrier, thus reducing both the overall volume and weight of the planetary carrier.

[0013] Optionally, the planetary carrier also has multiple shaft holes; the multiple shaft holes correspond one-to-one with multiple second mounting spaces, the shaft holes communicate with the corresponding second mounting spaces, the planetary gears rotate relative to the shaft holes via a rotating shaft, and the shaft holes pass through the shoulder.

[0014] With the above method, the shaft hole penetrates the shoulder. In this way, the axis of the planetary gear can be set closer to the axis of the planet carrier, reducing the distance between the planetary gear and the sun gear, thereby allowing for a thicker wall on the smaller planetary gears.

[0015] Optionally, the shaft hole forms a notch on the shoulder; the retaining ring has a positioning block on the side adjacent to the shoulder, and the positioning block cooperates with the notch.

[0016] The above solution utilizes the notch formed in the shoulder by the shaft hole to limit the retaining ring, preventing it from rotating relative to the planetary carrier, thereby improving the service life of the retaining ring and bearing. Furthermore, it eliminates the need for additional slots in the planetary carrier, ensuring its structural strength and rotational stability.

[0017] Optionally, the positioning blocks are multiple, and the multiple positioning blocks are arranged in a ring array about the axis of the retaining ring.

[0018] With the above scheme, when the retaining ring is installed on the planetary carrier, the positioning blocks can be evenly arranged about the axis of the planetary carrier, preventing uneven circumferential mass distribution of the planetary carrier and ensuring the smooth rotation of the planetary carrier.

[0019] Optionally, the retaining ring is made of steel; and / or the planetary carrier is made of cast iron.

[0020] According to another aspect of this disclosure, a wind turbine generator set is also provided, the wind turbine generator set including the gearbox described above.

[0021] According to another aspect of this disclosure, a planetary transmission assembly is also provided, the planetary transmission assembly comprising: a planetary carrier, one end of which is provided with a support ring and a shoulder disposed adjacent to the support ring, the support ring forming an opening around which the shoulder protrudes from the outer peripheral surface of the support ring; a bearing disposed on the support ring; a retaining ring sandwiched between the bearing and the shoulder, the retaining ring partially protruding from the outer peripheral surface of the shoulder; a sun gear, the sun gear being installed into the interior of the planetary carrier through the opening and rotatably connected to the planetary carrier; and a plurality of planet gears, the plurality of planet gears being rotatably connected to the planetary carrier and meshing with the sun gear, the shoulder being located between the bearing and the planet gears. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A partial cross-sectional schematic diagram of a gearbox structure in the related art is shown;

[0024] Figure 2 A partial cross-sectional schematic diagram of a gearbox according to an embodiment of the present disclosure is shown.

[0025] Figure 3 It shows Figure 2 Enlarged diagram of section A in the middle;

[0026] Figure 4 A perspective view of a planetary carrier according to an embodiment of the present disclosure is shown;

[0027] Figure 5A perspective view of a retaining ring according to an embodiment of the present disclosure is shown.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Planetary carrier; 110. Support ring; 111. Opening; 120. Shoulder; 121. Notch; 130. First mounting space; 140. Second mounting space; 150. Shaft hole;

[0030] 200. Bearings;

[0031] 300. Retaining ring; 310. Positioning block;

[0032] 400. Sun Gear;

[0033] 500, planetary gear; 510, pivot. Detailed Implementation

[0034] Wind turbine gearboxes commonly employ a multi-stage planetary transmission structure. The driving element for each stage of the planetary transmission is a planetary carrier, with bearings mounted on the carrier and fixed to the gearbox housing to support it. One end of the planetary carrier is connected to the wind turbine, while the other end is connected to the sun gear via planetary gears, and then to the generator via the sun gear.

[0035] When designing a gearbox, such as Figure 1 As shown, considering that the sun gear needs to be installed inside the planetary carrier through the opening on the right side, the size of the sun gear is limited by the size of the opening. The addendum circle diameter of the sun gear should be less than or equal to the diameter of the opening. Simultaneously, the planetary gear shaft holes are located above the bearing shoulder. The wall thickness of the planetary gears should not be less than the sum of the bearing's support wall thickness and the bearing's shoulder height to ensure meshing between the planetary gears and the sun gear installed inside the planetary carrier. Here, the wall thickness of the planetary gears refers to the difference between the root circle of the planetary gear and the radius of its mounting hole. Furthermore, considering the bearing installation design, it is also necessary to ensure sufficient support wall thickness at the inner diameter mounting area of ​​the bearing inner ring to prevent deformation and slippage under load. Additionally, sufficient shoulder height is required on the bearing end face to support it and prevent uneven localized stress and large deformation that could affect bearing operation. Therefore, the usual practice is to increase the thickness of the planetary gears during the design phase to ensure that the planetary gears mesh with the sun gear, and that the bearings have sufficient side shoulder height and inner ring support thickness. However, this restricts the size design of the planetary gears, making it impossible to make them smaller. Furthermore, a large amount of the planetary gear's material is not used for load bearing, which is not conducive to improving the material utilization rate of the planetary gears and affects the torque density.

[0036] Based on this, this disclosure compensates for the insufficient shoulder height by adjusting the shoulder height at the bearing location on the planetary carrier and simultaneously installing retaining rings to support the bearing end face. In this way, the retaining rings meet the bearing end face support requirements without reducing the support wall thickness. Furthermore, as the shoulder height decreases, the planetary gear wall thickness can be reduced, thereby improving the material utilization rate of the planetary gears and influencing torque density.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.

[0038] like Figures 2 to 5 As shown in this embodiment, the gearbox can be applied in wind turbine generator sets to adjust the low speed from the wind turbine to a high speed and transmit it to the generator. Of course, the gearbox can also be applied to other equipment requiring speed or torque regulation, such as automobiles and machine tools.

[0039] Specifically, the gearbox may include a housing, a planetary carrier 100, bearings 200, and retaining rings 300. The housing, as the main supporting component of the gearbox, primarily supports and protects other components within the gearbox. The planetary carrier 100, bearings 200, and retaining rings 300 are housed within the housing. The planetary carrier 100 is the core load-bearing and force-transmitting component of the planetary gear transmission system, primarily serving as a support for the planetary gears. One end of the planetary carrier 100 has a support ring 110 and a shoulder 120 adjacent to the support ring 110. The support ring 110 has an inner circumferential surface and an outer circumferential surface. The inner circumferential surface of the support ring 110 forms an opening 111 for the sun gear 400 to enter. The shoulder 120 protrudes from the outer circumferential surface of the support ring 110. The bearing 200 is disposed between the support ring 110 and the housing. The planetary carrier 100 rotates relative to the housing via the bearing 200, thereby supporting the planetary carrier 100, improving the rotational stability of the planetary carrier 100, and reducing the frictional force when the planetary carrier 100 rotates relative to the housing. The retaining ring 300 is sandwiched between the bearing 200 and the shoulder 120, and part of the retaining ring 300 protrudes from the outer peripheral surface of the shoulder 120.

[0040] In this way, by providing a retaining ring 300 that protrudes slightly from the outer circumference of the shoulder 120 between the bearing 200 and the shoulder 120, the retaining ring 300 can support the end face of the bearing 200, thus meeting the end face support requirements and eliminating the need to increase the height of the shoulder 120. As the height of the shoulder 120 decreases, while still providing support for the end face and inner diameter mounting portion of the bearing 200, the thickness of the planetary gear's bedding can be increased, avoiding excessive material buildup and improving the material utilization and torque density of the planetary gear.

[0041] For example, when the gearbox is used in a wind turbine generator set, the bearing 200 is a bearing on the planetary carrier 100 near the generator side.

[0042] In some embodiments, the wall thickness of the retaining ring 300 is not less than half the wall thickness of the bearing 200, so as to ensure that the retaining ring 300 has sufficient support area on the end face of the bearing 200, and avoid uneven local stress on the end face of the bearing 200, large deformation, and thus affect the operation of the bearing 200.

[0043] It should be noted that the wall thickness of the retaining ring 300 refers to the distance between the inner and outer circumferential surfaces of the retaining ring 300, and correspondingly, the wall thickness of the bearing 200 refers to the distance between the inner and outer circumferential surfaces of the bearing 200.

[0044] In some embodiments, such as Figures 2 to 4 As shown, the gearbox also includes a sun gear 400 and multiple planet gears 500. The sun gear 400 is installed inside the planet carrier 100 through an opening 111 and is rotatably connected to the planet carrier 100. The diameter of the opening 111 should not be less than the addendum circle diameter of the sun gear 400. The multiple planet gears 500 are rotatably connected to the planet carrier 100 and mesh with the sun gear 400. A shoulder 120 is located between the bearing 200 and the planet gears 500 to axially limit the planet gears 500 and the bearing 200 using the shoulder 120 and the retaining ring 300 located between the shoulder 120 and the bearing 200, preventing axial movement and simplifying the structure.

[0045] For example, when the gearbox is used in a wind turbine generator set, the impeller is connected to the planetary carrier 100 of the gearbox to input kinetic energy. The power is then transmitted to the sun gear 400 through the meshing of the planetary gears 500. The sun gear 400, as the output component, transmits the power to the next stage gear pair, and finally outputs the power through the high-speed end of the parallel gear pair, which is connected to the generator shaft.

[0046] In some embodiments, such as Figure 4As shown, the planetary carrier 100 has a first mounting space 130 and multiple second mounting spaces 140. The first mounting space 130 communicates with the opening 111 and is used to mount the sun gear 400. The multiple second mounting spaces 140 are arranged in a ring array about the axis of the planetary carrier 100. The second mounting spaces 140 communicate with the first mounting space 130 and penetrate the outer circumference of the planetary carrier 100. Multiple planet gears 500 are rotatably connected within the multiple second mounting spaces 140. In this way, the sun gear 400 is built into the first mounting space 130 of the planetary carrier 100, and the planet gears 500 are arranged in a ring array in the outer second mounting spaces 140, forming a concentric circle layout from center to periphery, without occupying additional axial length. At the same time, the second mounting spaces 140 penetrate the outer circumference of the planetary carrier 100, eliminating the need to reserve complex closed cavities inside the planetary carrier 100, thus reducing both the overall volume and weight of the planetary carrier 100.

[0047] For example, the number of planetary gears 500 can be 6, and correspondingly, the number of second mounting spaces 140 can also be 6.

[0048] To facilitate the installation of the planetary gears 500, in some embodiments, the planetary carrier 100 also has multiple shaft holes 150. The multiple shaft holes 150 correspond one-to-one with multiple second mounting spaces 140, and the shaft holes 150 communicate with the corresponding second mounting spaces 140. The planetary gears 500 rotate relative to the shaft holes 150 through the rotating shaft 510.

[0049] Furthermore, the shaft hole 150 extends through the shoulder 120. This allows the axis of the planetary gear 500 to be positioned closer to the axis of the planet carrier 100, reducing the distance between the planetary gear 500 and the sun gear 400, thereby allowing for a greater thickness of the small planetary gear 500.

[0050] Considering that if the retaining ring 300 rotates relative to the planetary carrier 100, it is prone to wear with the bearing 200 and the shoulder 120, in some embodiments, after the shaft hole 150 passes through the shoulder 120, a notch 121 can be formed in the shaft hole 150 on the shoulder 120. A positioning block 310 is provided on the side of the retaining ring 300 adjacent to the shoulder 120, and the positioning block 310 cooperates with the notch 121. That is to say, the notch 121 formed by the shaft hole 150 on the shoulder 120 can be used to limit the retaining ring 300, preventing the retaining ring 300 from rotating relative to the planetary carrier 100, thereby improving the service life of the retaining ring 300 and the bearing 200. Furthermore, there is no need to make additional slots in the planetary carrier 100, ensuring the structural strength and rotational stability of the planetary carrier 100.

[0051] For example, the side of the positioning block 310 adjacent to the axis of the retaining ring 300 can be constructed as an arc-shaped surface, which matches the groove wall surface of the notch 121, thereby ensuring the stability and positioning accuracy of the engagement between the positioning block 310 and the notch 121. Furthermore, during assembly, the rotating shaft 510 of the planetary gear 500 can be installed in the shaft hole 150 first, and then the retaining ring 300 can be installed, to avoid the retaining ring 300 interfering with the rotating shaft 510 of the planetary gear 500 and affecting its installation.

[0052] Furthermore, there are multiple positioning blocks 310, which are arranged in a circular array about the axis of the retaining ring 300. In this way, when the retaining ring 300 is installed on the planetary carrier 100, the positioning blocks 310 can be evenly arranged about the axis of the planetary carrier 100, preventing uneven circumferential mass distribution of the planetary carrier 100 and ensuring the rotational stability of the planetary carrier 100.

[0053] For example, multiple positioning blocks 310 correspond one-to-one with multiple notches 121, so that the retaining ring 300 can use as many positioning blocks 310 as possible to prevent its rotation. Multiple positioning blocks 310 jointly bear the anti-rotation force, reducing the possibility of breakage and damage of a single positioning block 310 and ensuring the stability of equipment operation.

[0054] The retaining ring 300 is made of steel to ensure its structural strength and wear resistance, thereby extending its service life. The planetary carrier 100 is made of cast iron.

[0055] According to another aspect of this disclosure, a wind turbine generator set is also provided, which includes the gearbox described above.

[0056] It should be noted that the specific structure of the gearbox can be found in the detailed description in the above embodiments, and will not be repeated here.

[0057] According to another aspect of this disclosure, a planetary transmission assembly is also provided, comprising: a planet carrier 100, one end of which is provided with a support ring 110 and a shoulder 120 disposed adjacent to the support ring 110, the support ring 110 forming an opening 111 around it, and the shoulder 120 protruding from the outer peripheral surface of the support ring 110; a bearing 200 disposed on the support ring 110; a retaining ring 300 sandwiched between the bearing 200 and the shoulder 120, the retaining ring 300 partially protruding from the outer peripheral surface of the shoulder 120; a sun gear 400 installed inside the planet carrier 100 through the opening 111 and rotatably connected to the planet carrier 100; and a plurality of planet gears 500 rotatably connected to the planet carrier 100 and meshing with the sun gear 400, the shoulder 120 being located between the bearing 200 and the planet gears 500.

[0058] It should be noted that the specific structures of the planetary carrier 100, bearing 200, retaining ring 300, sun gear 400 and planet gear 500 can be found in the detailed descriptions in the above embodiments, and will not be repeated here.

[0059] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.

[0060] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A gearbox, characterized in that, The gearbox includes: Box; A planetary carrier (100) is disposed in the housing. One end of the planetary carrier (100) is provided with a support ring (110) and a shoulder (120) provided adjacent to the support ring (110). The support ring (110) surrounds to form an opening (111) for the sun gear (400) to enter. The shoulder (120) protrudes from the outer peripheral surface of the support ring (110). A bearing (200) is disposed between the support ring (110) and the housing, and the planetary carrier (100) rotates relative to the housing via the bearing (200); A retaining ring (300) is sandwiched between the bearing (200) and the shoulder (120), and the retaining ring (300) partially protrudes from the outer peripheral surface of the shoulder (120).

2. The gearbox according to claim 1, characterized in that, The wall thickness of the retaining ring (300) is not less than half the wall thickness of the bearing (200).

3. The gearbox according to claim 1, characterized in that, The sun gear (400) is installed into the interior of the planetary carrier (100) through the opening (111) and is rotatably connected to the planetary carrier (100); The gearbox also includes a plurality of planetary gears (500), which are rotatably connected to the planet carrier (100) and mesh with the sun gear (400), and the shoulder (120) is located between the bearing (200) and the planetary gears (500).

4. The gearbox according to claim 3, characterized in that, The planetary carrier (100) has a first mounting space (130) and multiple second mounting spaces (140), wherein, The first mounting space (130) is connected to the opening (111), and the first mounting space (130) is used to mount the sun gear (400); A plurality of second mounting spaces (140) are arranged in a ring array about the axis of the planetary carrier (100). The second mounting spaces (140) communicate with the first mounting space (130) and penetrate the outer peripheral surface of the planetary carrier (100). A plurality of planetary gears (500) are rotatably connected in the plurality of second mounting spaces (140).

5. The gearbox according to claim 4, characterized in that, The planetary carrier (100) also has multiple shaft holes (150); The plurality of shaft holes (150) correspond one-to-one with the plurality of second mounting spaces (140), the shaft holes (150) are connected to the corresponding second mounting spaces (140), the planetary gear (500) rotates relative to the shaft holes (150) through the rotating shaft (510), and the shaft holes (150) pass through the shoulder (120).

6. The gearbox according to claim 5, characterized in that, The shaft hole (150) forms a notch (121) on the shoulder (120); The retaining ring (300) has a positioning block (310) on the side adjacent to the shoulder (120), and the positioning block (310) cooperates with the notch (121).

7. The gearbox according to claim 6, characterized in that, The positioning blocks (310) are multiple, and the multiple positioning blocks (310) are arranged in a ring array about the axis of the retaining ring (300).

8. The gearbox according to any one of claims 1 to 7, characterized in that, The retaining ring (300) is made of steel; and / or, The planetary carrier (100) is made of cast iron.

9. A wind turbine generator set, characterized in that, The wind turbine generator set includes the gearbox as described in any one of claims 1 to 8.

10. A planetary transmission assembly, characterized in that, The planetary transmission assembly includes: A planetary carrier (100) is provided at one end with a support ring (110) and a shoulder (120) provided adjacent to the support ring (110). The support ring (110) forms an opening (111) around it, and the shoulder (120) protrudes from the outer peripheral surface of the support ring (110). A bearing (200) is disposed on the support ring (110); A retaining ring (300) is sandwiched between the bearing (200) and the shoulder (120), and the retaining ring (300) partially protrudes from the outer peripheral surface of the shoulder (120); A sun gear (400) is installed inside the planetary carrier (100) through the opening (111) and is rotatably connected to the planetary carrier (100); A plurality of planetary gears (500) are rotatably connected to the planet carrier (100) and mesh with the sun gear (400), and a shoulder (120) is located between the bearing (200) and the planetary gears (500).

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