A planetary wheel bearing assembly for a wind turbine gearbox and a method of manufacturing the same

Abstract

The application provides a planetary wheel bearing assembly for a wind power gear box and a manufacturing method thereof, and belongs to the technical field of shaft supporting structure of gear boxes. The planetary wheel bearing assembly comprises a planetary wheel, a planetary shaft pin and two bearing assemblies. The two bearing assemblies comprise two rows of proximal rollers and proximal cages arranged close to each other, and two rows of distal rollers and distal cages arranged away from each other. The two proximal cages are conventional cages with pocket holes for positioning the proximal rollers, and support beams are arranged between adjacent pocket holes. The two distal cages are strut type cages with struts penetrating the center holes of the distal rollers, and the two ends of the struts are respectively fixed with retainer rings. The application forms a differential design between the middle two rows and the outermost two sides. The outermost two rows utilize the advantages of the strut type cage, can obtain better lubrication and cooling effect, better load capacity and higher strength, avoid premature failure of the outermost two rows, and improve the reliability of the bearing assembly.

Description

Technical Field

[0001] The invention relates to a planetary gear bearing assembly for a wind power gear box and a manufacturing method thereof, belonging to the technical field of shaft support structures of gear boxes. Background Art

[0002] Wind turbines are used in harsh environments with inconvenient transportation. Once a gearbox fails, it is very difficult to repair, which will seriously affect the economic benefits of the wind farm. Therefore, high requirements are placed on the reliability and service life of the gearbox.

[0003] The most common failure modes in wind turbine gearbox bearings are: 1) wear; 2) cage deformation; and 3) roller spalling. The planetary gear train is one of the key operating structures in a wind turbine gearbox, and the bearings are the key components supporting the planetary gear train. Currently, the bearing assemblies in planetary gear trains typically utilize cylindrical roller bearing assemblies without outer rings (the two bearing assemblies employed share the same basic structure, and each bearing assembly has two rows of cylindrical rollers and a consistent cage structure). During wind turbine gearbox operation, the bearing rollers on the motor side of the planetary gear train typically fail earlier than those on the blade side. This is generally believed to be caused by the greater load on the motor side of the bearing compared to the blade side during operation. The solution is to appropriately increase the clearance between the bearings on both sides and the inner circumference of the planetary gear.

[0004] For example, Chinese utility model patent application number CN221921902U discloses a planetary gear bearing assembly and a wind turbine gearbox. The planetary gear bearing assembly includes two bearing assemblies, both of which are positioned between the planetary gear and the planetary pin. Each bearing assembly comprises an inner ring, a first roller set, and a second roller set. The inner ring is sleeved onto the planetary pin. The first and second roller sets are spaced axially around the inner ring, with the first roller set positioned near the end of the planetary pin. The outer diameter of the first roller set is smaller than that of the second roller set, so that the clearance between the first roller set and the inner circumference of the planetary gear is greater than the clearance between the second roller set and the inner circumference of the planetary gear. This allows the second roller set in the middle to bear the load preferentially, reducing the stress on the first roller sets on either side and ensuring more uniform load distribution across the roller sets. Furthermore, each roller set is equipped with a retainer, which should be a conventional retainer containing pockets and support beams between adjacent pockets.

[0005] However, in actual applications, it is found that load eccentricity has a certain degree of randomness. It is difficult to accurately determine how large the load difference is and how large the clearance difference is required for matching. Excessive clearance on both sides will cause the load-bearing area on both sides to become smaller, and the risk of roller slippage in actual operation will increase. Improper matching may also backfire and cause the load distribution of the bearing to deteriorate further, resulting in poor reliability of the bearing assembly. Summary of the Invention

[0006] The object of the present invention is to provide a planetary gear bearing assembly for a wind power gearbox, so as to solve the problem in the prior art that the uniformity of roller load is improved by increasing the clearance between the bearings on both sides and the inner circumference of the planetary gear, but it is difficult to accurately determine the clearance difference to be used for matching, which leads to an increased risk of roller slippage when the clearance is too large, and even worse load distribution of the bearing when the matching is improper, resulting in poor reliability of the bearing assembly; the object of the present invention is also to provide a method for manufacturing a planetary gear bearing assembly for a wind power gearbox, so as to solve the above problems.

[0007] To achieve the above objectives, the planetary gear bearing assembly for a wind turbine gearbox in the present invention adopts the following technical solutions:

[0008] A planetary gear bearing assembly for a wind turbine gearbox, the planetary gear bearing assembly comprising a planetary gear, a planetary shaft pin and two bearing assemblies arranged axially apart and installed between the planetary gear and the planetary shaft pin, the two bearing assemblies comprising two rows of proximal rollers arranged closely together and proximal retainers cooperating with each row of proximal rollers, and also comprising two rows of distal rollers arranged far apart together and distal retainers cooperating with each row of distal rollers, the two proximal retainers being conventional retainers having pockets for positioning the proximal rollers and support beams being provided between adjacent pockets, and the two distal retainers being pillar-type retainers having pillars passing through the center holes of the distal rollers and retaining rings being fixed at both ends of the pillars.

[0009] The beneficial effects of the above technical solution are as follows: This invention is an element replacement invention. The two outermost rows of rollers (distal rollers) are replaced with rollers with center holes, and the two outermost retainers (distal retainers) are replaced with pillar-type retainers. The pillar-type retainers have pillars extending through the center holes of the distal rollers and are secured with retaining rings at each end. The two proximal rows of rollers and the two proximal retainers remain conventional rollers, resulting in a differentiated design between the two middle rows and the outermost rows. The outermost rows leverage the advantages of the pillar-type retainer, creating gaps between adjacent distal rollers, allowing for more lubricant to flow, thereby achieving better lubrication and cooling. The pillar-type retainer can accommodate a larger number of rollers, thereby increasing the load-bearing capacity of the two outermost rows and improving the bearing's compatibility with complex operating conditions. Furthermore, compared to conventional retainers, the pillar-type retainer is stronger, improving the reliability of the two outermost rows of retainers during bearing operation.

[0010] In summary, the present invention improves the reliability of the bearing assembly in another way. This way avoids premature failure of the two outermost rows by making the two outermost rows "stronger" than the two middle rows. There is no need to consider the size of the load difference and how large the clearance difference should be matched. Of course, the technical solution of the present invention does not conflict with the load-sharing solution of adjusting the clearance. The load-sharing property of the bearing can also be further improved by adjusting the clearance on the basis of the present invention. Therefore, the present invention solves the problem of increased risk of roller slippage when the clearance is too large due to relying solely on adjusting the clearance, and the problem of worsening load-sharing property of the bearing when the clearance is not matched properly, resulting in poor reliability of the bearing assembly.

[0011] Furthermore, one end of the pillar is threadedly connected to the retaining ring on one side, and the other end of the pillar is welded and fixed to the retaining ring on the other side. The retaining rings welded and fixed to the corresponding pillars in the two pillar-type retaining frames are respectively located at the outermost sides of the planetary gear bearing assemblies.

[0012] Furthermore, the retaining ring of the pillar type retaining frame, which is threadedly connected to the pillar, is provided with a threaded hole, and the retaining ring fixed by welding to the pillar is provided with a through hole for the pillar end to pass through, and the pillar end is fixed by welding to the through hole.

[0013] Furthermore, the positions where the threaded holes are formed and the positions where the through holes are formed on the two retaining rings of the pillar-type retainer are respectively thickened positions.

[0014] Furthermore, the parts of the two retaining rings of the pillar-type retainer that are connected to the pillars are all thickened parts. The thickened parts are arranged at intervals along the circumference of the retaining rings, and each thickened part is provided with a connection hole connected to the pillar.

[0015] Furthermore, a plurality of bosses are provided on the opposite end surfaces of the two retaining rings of the pillar-type retainer at intervals along the circumferential direction, and the positions where the bosses are located constitute the aforementioned thickened portions.

[0016] Furthermore, the inner circumference of the planetary gear constitutes the outer raceway of each row of rollers, the clearances between the two rows of distal rollers and the inner circumference of the planetary gear are equal, the clearances between the two rows of proximal rollers and the inner circumference of the planetary gear are equal, and the clearances between the two rows of distal rollers and the inner circumference of the planetary gear are not less than the clearances between the two rows of proximal rollers and the inner circumference of the planetary gear.

[0017] To achieve the above-mentioned purpose, the method for manufacturing a planetary gear bearing assembly for a wind turbine gearbox in the present invention adopts the following technical solution:

[0018] A method for manufacturing a planetary gear bearing assembly for a wind turbine gearbox, the planetary gear bearing assembly comprising a planetary gear, a planetary shaft pin, two bearing assemblies and a distance ring, the two bearing assemblies each comprising an inner ring, two rows of rollers and two corresponding retaining frames, one of the two retaining frames being a pillar-type retaining frame and the other being a conventional retaining frame, the method comprising first placing the assembled first bearing assembly on a supporting fixture with the pillar-type retaining frame facing downward, then sleeve the planetary gear on the outside of the first bearing assembly from top to bottom, then sequentially placing the distance ring and the assembled second bearing assembly into the inner hole of the planetary gear with the pillar-type retaining frame in the second bearing assembly facing upward, and then pressing so that the inner rings of the two bearing assemblies are tightly fitted with the distance ring, and finally installing the planetary shaft pin into the inner holes of the two inner rings and the distance ring.

[0019] The beneficial effect of the above technical solution is that in the planetary gear bearing assembly for a wind turbine gearbox manufactured using the above method, the two outermost retainers are both pillar-type retainers, while the two middle retainers are conventional retainers. This differentiates the design of the two middle rows from the outermost rows. The two outermost rows can take advantage of the pillar-type retainers, creating gaps between the rollers, allowing more lubricating oil to pass through, thereby achieving better lubrication and cooling. The pillar-type retainers can also accommodate a larger number of rollers, thereby increasing the load-bearing capacity of the two outermost rows and improving the bearing's compatibility with complex operating conditions. Furthermore, compared to conventional retainers, the pillar-type retainers are stronger, improving the reliability of the two outermost rows during bearing operation. Therefore, by making the two outermost rows "stronger" than the middle two rows, the present invention prevents premature failure of the two outermost rows and improves the reliability of the bearing assembly.

[0020] Furthermore, before installing the planetary pins, the inner holes of the two inner rings are heated and the planetary pins are frozen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of an embodiment of a planetary gear bearing assembly for a wind turbine gearbox according to the present invention (with some parts cut away);

[0022] Figure 2 This is a left side view of an embodiment of a planetary gear bearing assembly for a wind turbine gearbox according to the present invention;

[0023] Figure 3 A perspective view of a single bearing assembly in an embodiment of a planetary gear bearing assembly for a wind turbine gearbox according to the present invention;

[0024] Figure 4 A perspective view of a pillar-type retainer in an embodiment of a planetary gear bearing assembly for a wind turbine gearbox according to the present invention;

[0025] Figure 5This is an exploded view of a pillar-type retainer in an embodiment of a planetary gear bearing assembly for a wind turbine gearbox of the present invention;

[0026] Figure 6 A perspective view of a conventional retainer in an embodiment of a planetary gear bearing assembly for a wind turbine gearbox according to the present invention;

[0027] Figure 7 A cross-sectional view of a cylindrical roller capable of passing through a support column in an embodiment of a planetary gear bearing assembly for a wind turbine gearbox according to the present invention;

[0028] Figure 8 A cross-sectional view of a conventional cylindrical roller in an embodiment of a planetary bearing assembly for a wind turbine gearbox according to the present invention;

[0029] Figure 9 Schematic diagram of the assembly of the planetary gear bearing assembly for the wind turbine gearbox of the present invention Figure 1 ;

[0030] Figure 10 Schematic diagram of the assembly of the planetary gear bearing assembly for the wind turbine gearbox of the present invention Figure 2 ;

[0031] Figure 11 Schematic diagram of the assembly of the planetary gear bearing assembly for the wind turbine gearbox of the present invention Figure 3 ;

[0032] Figure 12 Schematic diagram of the assembly of the planetary gear bearing assembly for the wind turbine gearbox of the present invention Figure 4 .

[0033] In the figure: 1. Bearing assembly; 10. Bearing inner ring; 20. Outer row cage assembly; 201. Cylindrical roller that can pass through the pillar; 2011. Center hole; 202. Pillar-type cage; 2021. Pillar; 2022. Outer retaining ring; 2023. Inner retaining ring; 2024. Boss; 2025. Threaded hole; 2026. Through hole; 30. Inner row cage assembly; 301. Conventional cylindrical roller; 302. Conventional cage; 3021. Pocket; 3022. Support beam; 2. Distance ring; 3. Planetary shaft pin; 4. Planetary gear; 5. Support tooling. DETAILED DESCRIPTION

[0034] In response to the technical problems existing in the prior art, the basic concept of the present invention is to replace the two outermost rows of rollers with rollers with center holes, and replace the two outermost retaining frames with pillar-type retaining frames, so that the two outermost rows are "stronger" than the two middle rows, so as to avoid premature failure of the two outermost rows.

[0035] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0036] The embodiment of the planetary gear bearing assembly for a wind turbine gearbox (hereinafter referred to as the planetary gear bearing assembly) of the present invention is as follows:

[0037] like Figure 1 and Figure 2 As shown, the planetary gear bearing assembly consists of two identical bearing assemblies 1 , a spacer ring 2 , a planetary shaft pin 3 and a planetary gear 4 .

[0038] Two identical bearing assemblies 1 are installed between the planetary gears 4 and the planetary pins 3, arranged in series. A spacer ring 2 is placed over the planetary pins 3 and between the two bearing assemblies 1 to maintain a defined axial spacing between them. The two bearing assemblies 1 have identical structures and are symmetrically arranged with respect to the spacer ring 2 in the middle.

[0039] Specifically, each bearing assembly 1 includes a bearing inner ring 10, so the planetary gear bearing assembly has two bearing inner rings 10 in total. Each bearing inner ring 10 forms an interference fit with the planetary pin 3. Two rows of cage assemblies are disposed between each bearing inner ring 10 and the inner circumference of the planetary gear 4: the inner row of cage assemblies 30 is located closer to the distance ring 2, and the outer row of cage assemblies 20 is located farther from the distance ring 2.

[0040] Combine Figure 3 As shown, the inner row cage assembly 30 includes a row of conventional cylindrical rollers 301 and a conventional cage 302 that cooperates with the row of conventional cylindrical rollers 301. Figure 8 As shown, conventional cylindrical roller 301 is a solid cylindrical roller. Figure 6 As shown, the conventional retainer 302 includes pockets 3021 for accommodating and positioning conventional cylindrical rollers 301 , and support beams 3022 are provided between adjacent pockets 3021 .

[0041] like Figure 3 、 Figure 4 and Figure 5 As shown, the outer row cage assembly 20 includes a row of cylindrical rollers 201 that can wear pillars and a pillar-type cage 202 that cooperates with the row of cylindrical rollers 201 that can wear pillars. Figure 7 As shown, a center hole 2011 is provided on the cylindrical roller 201 that can pass through the pillar, and the pillar-type retaining frame 202 includes a pillar 2021 that passes through the above-mentioned center hole 2011 and retaining rings fixed at both ends of the pillar 2021, one of the retaining rings is located on the inner side, close to the inner row retaining frame assembly 30, and is the inner retaining ring 2023, and the other retaining ring is located on the outermost side, away from the inner row retaining frame assembly 30, and is the outer retaining ring 2022.

[0042] Therefore, Figure 1As shown, two rows of conventional cylindrical rollers 301 constitute two rows of proximal rollers arranged closely together, and the corresponding two conventional retaining frames 302 constitute the proximal retaining frames; two rows of cylindrical rollers 201 that can wear pillars constitute two rows of distal rollers arranged far apart, and the corresponding two pillar-type retaining frames 202 constitute the distal retaining frames. Compared to the prior art, the present invention replaces the two outermost rows of rollers (distal rollers) with cylindrical rollers 201 with wearable struts, and the two outermost retainers (distal retainers) with strut-type retainers 202. The two proximal rows of rollers remain conventional cylindrical rollers 301, and the two proximal retainers remain conventional retainers 302. This differentiates the design of the two middle rows from the outermost rows. The outermost rows leverage the advantages of the strut-type retainers 202, creating gaps between adjacent wearable cylindrical rollers 201, allowing for more lubricant to flow (conventional cylindrical rollers 301 are separated by support beams 3022, making it difficult for lubricant to pass through). This results in better lubrication and cooling. Furthermore, lubricant flowing through the outer row retainer assemblies 20 can also reach the inner row retainer assemblies 30, thereby enhancing the overall lubrication and cooling of the planetary gear bearing assembly.

[0043] Moreover, compared with conventional cylindrical rollers 301 having support beams 3022 between them, the spacing between cylindrical rollers 201 that can pass through pillars can be smaller, so that the pillar-type retainer 202 can match a larger number of rollers, thereby increasing the load-bearing capacity of the two outermost rows and improving the bearing's compatibility with complex working conditions.

[0044] At the same time, compared with the conventional retainer 302, the pillar-type retainer 202 has higher strength, which improves the reliability of the two outermost rows of retainers during bearing operation.

[0045] It's also well known that the cost of a strut-type retainer 202 is higher than that of a conventional retainer 302. Therefore, the present invention utilizes a combination of the strut-type retainer 202 and the conventional retainer 302. The strut-type retainer 202 and the cylindrical rollers 201, which can be inserted through the struts, are used in critical locations. This reduces the manufacturing cost of the planetary gear bearing assembly while still meeting operational requirements. Furthermore, the strut-type retainer 202 is heavier than the conventional retainer 302. This combination prevents the bearing assembly's moment of inertia from being excessively high due to its excessive weight, which could result in the bearing assembly's moment of inertia not meeting the required requirements.

[0046] like Figure 1 As shown, the outer circumference of each bearing inner ring 10 is machined with two inner raceways to respectively cooperate with a row of conventional cylindrical rollers 301 and a row of cylindrical rollers 201 that can be threaded into the support. The inner circumference of the planetary gear 4 includes two outer raceways, and each row of rollers directly cooperates with the inner circumference of the planetary gear 4.

[0047] Furthermore, the clearances between the two rows of cylindrical rollers 201 that can wear the pillars and the inner circumference of the planetary gear 4 are equal, the clearances between the two rows of conventional cylindrical rollers 301 and the inner circumference of the planetary gear 4 are equal, and the clearances between the two rows of cylindrical rollers 201 that can wear the pillars and the inner circumference of the planetary gear 4 are not less than the clearances between the two rows of conventional cylindrical rollers 301 and the inner circumference of the planetary gear 4. In this way, on the basis of the above scheme, the load uniformity of the bearing can be further improved by adjusting the clearance. The specific clearance difference can be adjusted according to the application experience of the gearbox host.

[0048] In summary, the present invention fully considers that actual eccentric load has certain randomness, and improves the reliability of bearing assembly through another method. This method avoids premature failure of the two outermost rows by making the two outermost rows "stronger" than the two middle rows, taking into account the economy, the smaller rotational inertia requirement of the bearing assembly and the advantages of other existing bearing assembly design concepts. Moreover, this scheme does not conflict with the load-balancing scheme of adjusting the clearance, and can be used alone or in combination. Therefore, the present invention reduces the complexity of load-balancing by relying solely on clearance adjustment on the basis of significantly improving the life and reliability of the planetary gear bearing assembly, and has great market application value.

[0049] Furthermore, the assembly method of the pillar type retainer 202 in this embodiment is as follows: Figure 4 and Figure 5 As shown, one end of the pillar 2021 is threadedly connected to the inner retaining ring 2023, and the other end of the pillar 2021 is welded to the outer retaining ring 2022, which can ensure the reliability of the connection. The outer retaining rings 2022 of the pillar-type retaining frames 202 on both sides are respectively located at the outermost sides of the planetary gear bearing assembly, which facilitates welding operations and ensures structural symmetry.

[0050] Furthermore, the inner retaining ring 2023 is provided with a threaded hole 2025 that is threadedly connected to the pillar 2021, and the outer retaining ring 2022 is provided with a through-hole 2026 for the end of the pillar 2021 to pass through. The through-hole 2026 is a through-hole, and the end of the pillar 2021 is welded to the through-hole 2026, which not only facilitates the welding operation but also improves the connection strength of the pillar-type retainer 202. Specifically, the end surface of the pillar 2021 does not pass through the through-hole 2026, and the space between the end surface of the pillar 2021 and the through-hole 2026 is filled with solder. Of course, in other embodiments, the end of the pillar 2021 can pass through the through-hole 2026 and then be welded to the through-hole 2026.

[0051] It should be noted that the retaining ring welded to support 2021 is positioned on the outermost side because, when conventional cylindrical rollers 301 and conventional retaining cage 302 are already assembled on the bearing inner ring 10, if the retaining ring welded to support 2021 is located on the inner side, close to the conventional cylindrical rollers 301, the space for welding and other operations is extremely limited, making smooth operation impossible. Even if the conventional cylindrical rollers 301 and conventional retaining cage 302 are assembled later, while there is ample space for welding, foreign matter such as solder that lands on the outer circumference of the bearing inner ring 10 requires additional cleaning, otherwise it will affect the installation and use of the conventional retaining cage 302. However, if the retaining ring welded to support 2021 is positioned on the outermost side, not only does it provide ample space for welding, but it also facilitates cleaning of foreign matter such as solder that lands on the outer circumference of the bearing inner ring 10.

[0052] Furthermore, the position where the threaded hole 2025 is opened on the inner retaining ring 2023 and the position where the through hole 2026 is opened on the outer retaining ring 2022 are thickened parts, which can facilitate the processing of the holes and ensure the depth of the holes without making the overall weight of the retaining rings too heavy.

[0053] Furthermore, a plurality of bosses 2024 are provided on the opposite end faces of the inner retaining ring 2023 and the outer retaining ring 2022 at circumferential intervals, and the positions of the bosses 2024 constitute the above-mentioned thickened parts, ensuring that the opposite end faces of the two retaining rings are flat. At the same time, grooves are formed between adjacent bosses 2024, and the cylindrical roller 201 that can pass through the pillar is located between the bosses 2024 on both sides, so the position of the groove constitutes an oil-passing structure, which facilitates the passage of lubricating oil and is beneficial to improving the lubrication and cooling effects.

[0054] In other embodiments, bosses may be provided on both the opposing end faces and the opposing end faces of the inner retaining ring 2023 and the outer retaining ring 2022, with the bosses also forming thickened portions. In other embodiments, bosses may be provided only on the opposing end faces of the inner retaining ring 2023 and the outer retaining ring 2022 to form thickened portions. In other embodiments, the inner retaining ring 2023 and the outer retaining ring 2022 may be thickened as a whole without further bosses, so that both the opposing end faces and the opposing end faces of the two retaining rings are smooth.

[0055] In other embodiments, the retaining ring welded to the pillar may no longer have a through hole for the pillar end to pass through. In this case, the pillar directly abuts against the end face of the retaining ring and is welded to the end face of the retaining ring, or a positioning groove is opened on the end face of the retaining ring, and the pillar end is inserted into the positioning groove and welded to the positioning groove.

[0056] In other embodiments, both ends of the pillar can be welded to the two side retaining rings. In this case, both retaining rings have connecting holes, and the two ends of the pillar are respectively inserted into the connecting holes and welded to the connecting holes. In this case, the connection holes can be located in thickened areas, and the thickened areas are arranged at intervals along the circumference of the retaining rings. The thickening method is the same as above. Of course, in other embodiments, the two ends of the pillar can also be riveted to the two side retaining rings. In this case, the connecting holes on the two retaining rings are rivet holes.

[0057] The embodiment of the method for manufacturing a planetary gear bearing assembly for a wind power gearbox in the present invention is as follows:

[0058] The specific structure of the planetary gear bearing assembly is as described in the above embodiment, that is, Figure 1 As shown, the planetary gear bearing assembly includes a planetary gear 4, a planetary shaft pin 3, two bearing assemblies and a spacer ring 2. The two bearing assemblies each include a bearing inner ring 10, two rows of rollers and two corresponding retainers. One of the two retainers is a pillar-type retainer 202, and the other is a conventional retainer 302. The method includes the following steps:

[0059] like Figure 9 As shown, the assembled first bearing assembly is first placed on the support tooling 5, with the pillar-type retainer 202 at the bottom and the conventional retainer 302 at the top, and the bearing inner ring 10 is supported on the support tooling 5. The support tooling 5 is specifically a support ring, and the inner diameter of the support ring is larger than the inner diameter of the bearing inner ring 10.

[0060] It should be noted that the first bearing assembly is assembled in advance (the second bearing assembly to be installed later is also assembled in advance). The assembly process is to first put the inner retaining ring 2023 of the pillar-type retaining frame 202 on the outside of the bearing inner ring 10, and then screw a pillar 2021 into the inner retaining ring 2023 and put a cylindrical roller 201 that can pass through the pillar on the pillar 2021. The end of the bearing inner ring 10 is provided with a gap that is connected to the inner raceway and can allow a cylindrical roller to pass through. The cylindrical roller can be installed into the inner raceway through the gap and the cylindrical roller can be put on the pillar 2021. Then rotate the inner retaining ring 2023 by an angle, continue to screw into the pillar 2021 and install the cylindrical roller 201 that can be worn through the pillar through the above-mentioned gap, repeat the above steps until all the pillars 2021 and the cylindrical roller 201 that can be worn through the pillar are installed, then align the outer retaining ring 2022 with the end of each pillar 2021 and install it, so that the end of each pillar 2021 is inserted into the through hole 2026, and then weld and fix it, thus completing the assembly of the pillar-type retainer 202, a row of cylindrical rollers 201 that can be worn through the pillar, and the bearing inner ring 10.

[0061] Of course, if the ends of the bearing inner ring 10 do not have the aforementioned notches, then the cylindrical rollers 201 that can pass through the pillars can be placed into the inner raceway first, and then the pillars 2021 can be sequentially passed through the cylindrical rollers 201 that can pass through the pillars and screwed onto the inner retaining ring 2023. Finally, the outer retaining ring 2022 can be assembled and welded to the ends of the pillars 2021. In short, the welding and fixing of the outer retaining ring 2022 to the pillars 2021 is completed on the bearing inner ring 10, which is why the retaining rings welded to the pillars are placed on the outermost side.

[0062] The assembly of the conventional cylindrical rollers 301 and the conventional cage 302 is relatively simple. The conventional cage 302 is directly sleeved on the outside of the bearing inner ring 10, and each conventional cylindrical roller 301 is directly inserted through the pocket and embedded in the inner raceway.

[0063] Next, Figure 10 As shown, the planetary wheel 4 is hoisted and the inner circumference of the planetary wheel 4 is concentric with the first bearing assembly, and then the planetary wheel 4 is sleeved on the outside of the first bearing assembly from top to bottom.

[0064] Then as Figure 11 As shown, the distance ring 2 and the second bearing assembly are sequentially placed into the inner hole of the planetary gear 4 and are concentrically processed. When placed, the pillar-type retainer 202 in the second bearing assembly faces upward and the conventional retainer 302 faces downward. Then, the second bearing assembly is pressed with a pressing tool so that the lower end face of the distance ring 2 is tightly fitted with the bearing inner ring 10 in the first bearing assembly, and at the same time, the bearing inner ring 10 in the second bearing assembly is tightly fitted with the upper end face of the distance ring 2.

[0065] Then as Figure 12 As shown, the inner bores of the two bearing inner rings 10 are heated (the clearance between the spacer ring 2 and the planetary pin 3 does not require heating), and the planetary pin 3 is frozen. The planetary pin 3 is then quickly inserted into the corresponding positions in the inner bores of the two bearing inner rings 10 and the spacer ring 2. Finally, after cooling to room temperature, the auxiliary accessories are removed and the remaining components are assembled to complete the installation.

[0066] In the planetary gear bearing assembly for a wind turbine gearbox manufactured using the above method, the two outermost retainers are strut-type retainers, while the two middle retainers are conventional retainers. This differentiates the design of the two middle rows from the outermost rows. The outermost rows leverage the advantages of the strut-type retainers, creating clearance between the rollers, allowing for more lubricant to flow through, resulting in better lubrication and cooling. Furthermore, the strut-type retainers can accommodate a larger number of rollers, thereby increasing the load-bearing capacity of the outermost rows and improving the bearing's compatibility with complex operating conditions. Furthermore, compared to conventional retainers, the strut-type retainers are stronger, improving the reliability of the outermost rows during bearing operation. Therefore, by making the outermost rows "stronger" than the middle rows, the present invention prevents premature failure of the outermost rows and enhances the reliability of the bearing assembly.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A planetary gear bearing assembly for a wind turbine gearbox, characterized in that: The planetary gear bearing assembly includes a planetary gear, a planetary shaft pin and two bearing assemblies installed between the planetary gear and the planetary shaft pin and arranged along the axial direction. The two bearing assemblies include two rows of proximal rollers arranged closely and proximal retainers cooperating with each row of proximal rollers, and also include two rows of distal rollers arranged far apart and distal retainers cooperating with each row of distal rollers. The two proximal retainers are conventional retainers with pockets for positioning the proximal rollers and support beams provided between adjacent pockets. The two distal retainers are pillar-type retainers with pillars passing through the center holes of the distal rollers and retaining rings fixed at both ends of the pillars.

2. The planetary gear bearing assembly for a wind turbine gearbox according to claim 1, wherein: One end of the pillar is threadedly connected to the retaining ring on one side, and the other end of the pillar is welded and fixed to the retaining ring on the other side. The retaining rings welded and fixed to the corresponding pillars in the two pillar-type retainers are respectively located at the outermost sides of the planetary gear bearing assemblies.

3. The planetary gear bearing assembly for a wind turbine gearbox according to claim 2, wherein: The retaining ring of the pillar type retaining frame is provided with a threaded hole on the retaining ring connected with the pillar thread, and the retaining ring fixed by welding to the pillar is provided with a through hole for the pillar end to penetrate. The pillar end is fixed by welding to the through hole.

4. The planetary gear bearing assembly for a wind turbine gearbox according to claim 3, wherein: Positions where threaded holes are formed on two retaining rings of the pillar-type retainer and positions where through holes are formed are respectively thickened positions.

5. The planetary gear bearing assembly for a wind turbine gearbox according to claim 4, wherein: A plurality of bosses are respectively provided on the opposite end surfaces of the two retaining rings of the pillar-type retainer at intervals along the circumferential direction, and the positions where the bosses are located constitute the thickened parts.

6. The planetary gear bearing assembly for a wind turbine gearbox according to claim 1, wherein: The parts of the two retaining rings of the pillar type retainer connected to the pillars are all thickened parts. The thickened parts are arranged at intervals along the circumference of the retaining rings, and each thickened part is provided with a connection hole connected to the pillar.

7. The planetary gear bearing assembly for a wind turbine gearbox according to claim 6, wherein: A plurality of bosses are respectively provided on the opposite end surfaces of the two retaining rings of the pillar-type retainer at intervals along the circumferential direction, and the positions where the bosses are located constitute the thickened parts.

8. The planetary gear bearing assembly for a wind turbine gearbox according to any one of claims 1 to 7, wherein: The inner circumference of the planetary gear constitutes the outer raceway of each row of rollers. The clearances between the two rows of distal rollers and the inner circumference of the planetary gear are equal, the clearances between the two rows of proximal rollers and the inner circumference of the planetary gear are equal, and the clearance between the two rows of distal rollers and the inner circumference of the planetary gear is not less than the clearance between the two rows of proximal rollers and the inner circumference of the planetary gear.

9. A method for manufacturing a planetary gear bearing assembly for a wind turbine gearbox according to claim 1, characterized in that: The planetary gear bearing assembly includes a planetary gear, a planetary shaft pin, two bearing assemblies and a distance ring. The two bearing assemblies each include an inner ring, two rows of rollers and two corresponding retaining frames. One of the two retaining frames is a pillar-type retaining frame and the other is a conventional retaining frame. The method includes first placing the assembled first bearing assembly on a supporting tooling with the pillar-type retaining frame facing downward, then sleeve the planetary gear on the outside of the first bearing assembly from top to bottom, and then sequentially place the distance ring and the assembled second bearing assembly into the inner hole of the planetary gear with the pillar-type retaining frame in the second bearing assembly facing upward, and then press tightly so that the inner rings of the two bearing assemblies fit tightly with the distance rings, and finally install the planetary shaft pin into the inner holes of the two inner rings and the distance rings.

10. The method for manufacturing a planetary gear bearing assembly for a wind turbine gearbox according to claim 9, wherein: Before installing the planetary pins, the inner holes of the two inner rings are heated and the planetary pins are frozen.

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