A wind turbine gearbox bearing structure

Abstract

The utility model discloses a kind of wind power gear box bearing structures, including bearing outer ring, bearing inner ring and the rolling body and retainer being set between bearing inner ring and bearing outer ring, rolling body includes a large-diameter cylindrical roller and two rows of angular contact ball rollers, two rows of angular contact ball rollers are symmetrically distributed in the two sides of large-diameter cylindrical roller, retainer includes roller support and ball support, large-diameter cylindrical roller is respectively rotationally connected on roller support, angular contact ball roller is respectively rollingly connected on ball support, elastic support component is arranged between bearing inner ring and gear box input shaft, oil seal structure is arranged at the both ends of bearing outer ring and bearing inner ring, the both ends of bearing inner ring are respectively threadedly connected with limit ring, the outer side of oil seal structure respectively with the inner side of limit ring contact. The utility model aims at providing a kind of wind power gear box bearing structure with high bearing capacity, dynamic buffering characteristic, long-acting lubrication and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of bearing structure technology, specifically a wind turbine gearbox bearing structure. Background Technology

[0002] With the rapid development of wind power generation technology, the reliability of the wind turbine gearbox, as the core transmission component of the wind turbine generator set, directly affects the overall operating efficiency and service life of the unit. Bearings, as key support components of the gearbox, must withstand high radial loads, axial impact loads, and variable torque under complex operating conditions; their performance determines the transmission accuracy and stability of the gearbox. Currently, most mainstream wind turbine gearbox bearings use traditional single-row cylindrical roller bearings or tapered roller bearings, but in practical applications, the following technical bottlenecks have been exposed:

[0003] 1. Limitations in load-bearing capacity

[0004] Traditional single-row cylindrical roller bearings can withstand large radial loads, but their axial load capacity is insufficient, requiring additional thrust bearings to meet bidirectional axial force requirements, which complicates the structure. While tapered roller bearings can withstand both radial and axial loads simultaneously, their roller convexity design easily leads to edge stress concentration, which can cause fatigue spalling, especially under variable speed and impact loads, thus limiting bearing life.

[0005] 2. Dynamic response defects

[0006] The rigid connection between the bearing and the input shaft is prone to transmitting vibration and impact during gearbox start-up, shutdown, or pitch control, causing periodic fluctuations in the contact stress between the rolling elements and the raceway, thus accelerating material fatigue. Although traditional metal elastic support components can buffer vibration, their stiffness is not adjustable and their damping characteristics are limited, making them unsuitable for wide-frequency load fluctuation scenarios.

[0007] 3. Insufficient surface protection

[0008] Raceways and rolling element surfaces are often treated with traditional carburizing or quenching, which provides a certain degree of hardness. However, under high contact stress and contaminant intrusion, they are prone to adhesive wear and corrosion. Especially in humid salt spray environments, the coating's corrosion resistance and self-lubrication are insufficient, leading to a shortened maintenance cycle.

[0009] To address the aforementioned technical challenges, there is an urgent need to develop a wind turbine gearbox bearing structure that combines high load-bearing capacity, dynamic buffering characteristics, long-term lubrication, and convenient maintenance, in order to improve the reliability and economy of gearbox operation in complex environments. Utility Model Content

[0010] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide a wind turbine gearbox bearing structure that combines high load-bearing capacity, dynamic buffering characteristics, long-term lubrication and convenient maintenance.

[0011] The technical solution adopted by this utility model to achieve the above objectives is: a wind turbine gearbox bearing structure, including an outer bearing ring, an inner bearing ring, and rolling elements and a cage disposed between the inner and outer bearing rings. The rolling elements include a row of large-diameter cylindrical rollers and two rows of angular contact ball rollers. The two rows of angular contact ball rollers are symmetrically distributed on both sides of the large-diameter cylindrical rollers. The large-diameter cylindrical rollers mainly bear radial loads, and the angular contact ball rollers balance axial loads through symmetrical distribution, taking into account both radial and axial load-bearing capacity of the device. The cage includes roller supports and ball supports. The large-diameter cylindrical rollers rotate... The bearing is dynamically connected to the roller support, and the angular contact ball rollers are respectively rolledly connected to the ball support to evenly space the rolling elements and avoid motion interference between the rolling elements. An elastic support assembly is provided between the inner ring of the bearing and the input shaft of the gearbox to buffer vibration and shock and reduce the impact of dynamic load on the bearing. Oil seal structures are provided at both ends of the outer ring and the inner ring of the bearing. Limiting rings are threaded to both ends of the inner ring of the bearing. The outer surface of the oil seal structure contacts the inner surface of the limiting ring to prevent grease leakage and contaminant intrusion. The limiting rings are fixed to both ends of the inner ring by threads to enhance the sealing reliability.

[0012] In the above technical solution, a first raceway is formed on the outer periphery of the bearing inner ring, and a large-diameter cylindrical roller is rolled within the first raceway. Curved grooves are formed on the edges of the bearing inner ring on both sides of the first raceway. An inner groove is formed on the inner side of the bearing outer ring. The two sides of the inner groove are respectively set as rounded corner structures. An angular contact ball roller is rolled between the curved groove and the rounded corner structure. The surfaces of the first raceway, the curved groove, and the inner groove are all provided with an anti-wear composite coating.

[0013] In the above technical solution, the anti-wear composite coating includes a substrate reinforcement layer and a surface functional layer. The substrate reinforcement layer is carburized bearing steel, and the surface functional layer consists of an FeCrAlSi alloy layer and a graphene MoS2 composite coating from the inside to the outside.

[0014] In the above technical solution, the bearing outer ring includes a left outer ring and a right outer ring. Several corresponding mounting blocks are fixedly connected to the outer peripheral sides of the left outer ring and the right outer ring respectively. The mounting block on the outer side of the left outer ring has a through mounting hole, and the mounting block on the outer side of the right outer ring has a threaded hole. One end of the bolt passes through the mounting hole and is threaded into the threaded hole.

[0015] In the above technical solution, oil injection holes are respectively opened on both sides of the outer ring of the bearing, and the other end of each oil injection hole is connected to the inner rolling groove. An oil injection nozzle is fixedly connected to the opening at the outer end of the oil injection hole.

[0016] In the above technical solution, the elastic support component includes at least two coaxially arranged semi-cylindrical bearing steel layers, and multiple rubber elastomers are solidified between adjacent two layers of bearing steel layers by vulcanization. The multiple rubber elastomers are separated into multiple columns by axial partition grooves and into multiple rows by circumferential partition grooves in the circumferential direction.

[0017] The beneficial effects of this utility model are:

[0018] 1. The combined rolling element design uses large-diameter cylindrical rollers and symmetrically distributed angular contact ball rollers to work together to meet both radial and axial load requirements, avoiding the problems of insufficient axial load of traditional single-row cylindrical rollers or stress concentration at the edge of tapered rollers.

[0019] 2. The multi-layer steel-rubber composite elastic support component combines the rigidity of steel with the elasticity of rubber. The vulcanization consolidation and the design of the partition groove optimize the deformation uniformity, effectively buffer vibration and impact, adapt to wide frequency range load fluctuations, and improve dynamic response characteristics.

[0020] 3. The anti-wear and corrosion composite coating improves surface hardness, corrosion resistance and self-lubricating properties through the synergistic effect of the substrate reinforcement layer, FeCrAlSi alloy layer and graphene MoS2 layer, and reduces wear and corrosion under high stress and contaminant intrusion.

[0021] 4. The split outer ring structure simplifies machining, disassembly, and maintenance. The oil injection hole and oil injection nozzle work together to directly lubricate the inner rolling groove, ensuring sufficient lubrication of the rolling elements and improving maintenance convenience.

[0022] 5. The oil seal structure is matched with the limit rings that are threaded at both ends of the inner ring, and the outer side contacts the seal to effectively prevent grease leakage and contaminant intrusion, thus improving the reliability of the seal. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the bearing of this utility model;

[0024] Figure 2 This is a schematic diagram of the bearing cross-sectional connection structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the bearing outer ring of this utility model;

[0026] Figure 4 This is a schematic diagram of the disassembled structure of the bearing outer ring of this utility model;

[0027] Figure 5 This is a schematic diagram of the cross-sectional connection structure of the bearing inner ring of this utility model;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the bearing inner ring of this utility model;

[0029] Figure 7 This is a schematic diagram of the disassembled structure of the elastic support component of this utility model.

[0030] In the diagram: 1. Bearing outer ring, 2. Bearing inner ring, 3. Large diameter cylindrical roller, 4. Angular contact ball roller, 5. Roller support, 6. Ball support, 7. Elastic support assembly, 8. Oil seal structure, 9. Limiting ring, 10. First raceway, 11. Curved groove, 12. Inner groove, 13. Rounded corner structure, 14. Left outer ring, 15. Right outer ring, 16. Mounting block, 17. Mounting hole, 18. Threaded hole, 19. Bolt, 20. Oil injection hole, 21. Oil injection nozzle, 22. Bearing shell steel layer, 23. Rubber elastomer, 24. Axial partition groove, 25. Circumferential partition groove. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0032] Please see Figure 1-7 A wind turbine gearbox bearing structure includes an outer ring 1, an inner ring 2, rolling elements and a cage disposed between the inner ring 2 and the outer ring 1. The rolling elements include a row of large-diameter cylindrical rollers 3 and two rows of angular contact ball rollers 4. The two rows of angular contact ball rollers 4 are symmetrically distributed on both sides of the large-diameter cylindrical rollers 3. The large-diameter cylindrical rollers 3 mainly bear radial loads, while the angular contact ball rollers 4 balance axial loads through symmetrical distribution, thus taking into account both radial and axial load-bearing capacity of the device. The cage includes roller supports 5 and ball supports 6. The large-diameter cylindrical rollers 3 are rotatably connected to the roller supports 5. Contact ball rollers 4 are rolledly connected to the ball bearing bracket 6 to evenly space the rolling elements and avoid motion interference between them. An elastic support assembly 7 is provided between the bearing inner ring 2 and the gearbox input shaft to buffer vibration and shock and reduce the impact of dynamic load on the bearing. Oil seal structures 8 are provided at both ends of the bearing outer ring 1 and the bearing inner ring 2. Limiting rings 9 are threaded to both ends of the bearing inner ring 2. The outer surface of the oil seal structure 8 contacts the inner surface of the limiting ring 9 to prevent grease leakage and contaminant intrusion. The limiting ring 9 is fixed to both ends of the inner ring by threads to enhance the sealing reliability.

[0033] In the above technical solution, a first raceway 10 is provided on the outer periphery of the bearing inner ring 2. A large-diameter cylindrical roller 3 is rolled and connected in the first raceway 10 to restrict the axial movement of the large-diameter cylindrical roller 3. Curved grooves 11 are respectively provided on the edges of the bearing inner ring 2 on both sides of the first raceway 10. An inner groove 12 is provided on the inner side of the bearing outer ring 1. The two sides of the inner groove 12 are respectively set as rounded corner structures 13. The curved groove 11 and the rounded corner structure 13 form an inclined diagonal with each other to restrict the axial movement of the angular contact ball roller 4. The angular contact ball roller 4 is rolled and connected between the curved groove 11 and the rounded corner structure 13. The surfaces of the first raceway 10, the curved groove 11 and the inner groove 12 are all provided with anti-wear composite coatings to optimize the contact stress distribution and enhance wear resistance.

[0034] In the above technical solution, the anti-wear composite coating includes a substrate reinforcement layer and a surface functional layer. The substrate reinforcement layer is carburized bearing steel, which is used to provide a high hardness base. The surface functional layer consists of an FeCrAlSi alloy layer and a graphene MoS2 composite coating from the inside to the outside. The FeCrAlSi alloy layer enhances the corrosion resistance / high temperature resistance, and the graphene MoS2 composite coating reduces the coefficient of friction (self-lubrication). The three layers work together to significantly extend the service life of the bearing.

[0035] In the above technical solution, the bearing outer ring 1 includes a left outer ring 14 and a right outer ring 15. Several corresponding mounting blocks 16 are fixedly connected to the outer peripheral sides of the left outer ring 14 and the right outer ring 15 respectively. The mounting block 16 on the outer side of the left outer ring 14 has a through mounting hole 17. The mounting block 16 on the outer side of the right outer ring 15 has a threaded hole 18 on one side. One end of the bolt 19 passes through the mounting hole 17 and is threaded into the threaded hole 18. The split design of the bearing outer ring 1 simplifies the component processing, and the bolt 19 connection facilitates disassembly and maintenance, reducing maintenance costs.

[0036] In the above technical solution, oil injection holes 20 are respectively opened on both sides of the outer ring 1 of the bearing. The other end of the oil injection hole 20 is connected to the inner rolling groove 12. An oil injection nozzle 21 is fixedly connected in the opening of the outer end of the oil injection hole 20 to inject grease between the outer ring 1 and the inner ring 2 of the bearing to ensure sufficient lubrication of the rolling elements.

[0037] In the above technical solution, the elastic support component 7 includes at least two coaxially arranged semi-cylindrical bearing steel layers 22. Between two adjacent bearing steel layers 22, multiple rubber elastomers 23 are solidified by vulcanization. The multiple rubber elastomers 23 are separated into multiple columns by axial partition grooves 24 and into multiple rows by circumferential partition grooves 25. The layered steel-rubber structure combines the rigidity of steel with the elasticity of rubber. Vulcanization and solidification improve the interfacial bonding force, and the partition groove design optimizes the uniformity of elastomer deformation, effectively absorbing impact loads.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wind turbine gearbox bearing structure, comprising an outer bearing ring (1), an inner bearing ring (2), and rolling elements and a cage disposed between the inner bearing ring (2) and the outer bearing ring (1), characterized in that: The rolling elements include a row of large-diameter cylindrical rollers (3) and two rows of angular contact ball rollers (4). The two rows of angular contact ball rollers (4) are symmetrically distributed on both sides of the large-diameter cylindrical rollers (3). The cage includes a roller support (5) and a ball support (6). The large-diameter cylindrical rollers (3) are rotatably connected to the roller support (5), and the angular contact ball rollers (4) are tumbledly connected to the ball support (6). An elastic support assembly (7) is provided between the inner ring (2) of the bearing and the input shaft of the gearbox. Oil seal structures (8) are provided at both ends of the outer ring (1) and the inner ring (2) of the bearing. Limiting rings (9) are threaded to both ends of the inner ring (2). The outer surface of the oil seal structure (8) is in contact with the inner surface of the limiting ring (9).

2. The wind turbine gearbox bearing structure according to claim 1, characterized in that: The bearing inner ring (2) has a first raceway (10) on its outer periphery. The large-diameter cylindrical roller (3) is rolled in the first raceway (10). The bearing inner ring (2) on both sides of the first raceway (10) has curved grooves (11) respectively. The bearing outer ring (1) has an inner groove (12) on its inner side. The two sides of the inner groove (12) are respectively set as rounded corner structures (13). The angular contact ball roller (4) is rolled between the curved groove (11) and the rounded corner structure (13). The surfaces of the first raceway (10), the curved groove (11) and the inner groove (12) are all provided with anti-wear composite coating.

3. The wind turbine gearbox bearing structure according to claim 2, characterized in that: The anti-wear composite coating includes a substrate reinforcement layer and a surface functional layer. The substrate reinforcement layer is carburized bearing steel, and the surface functional layer consists of an FeCrAlSi alloy layer and a graphene MoS2 composite coating from the inside out.

4. The wind turbine gearbox bearing structure according to claim 1, characterized in that: The bearing outer ring (1) includes a left outer ring (14) and a right outer ring (15). Several corresponding mounting blocks (16) are fixedly connected to the outer peripheral sides of the left outer ring (14) and the right outer ring (15). A mounting hole (17) is passed through the mounting block (16) on the outer side of the left outer ring (14). A threaded hole (18) is opened on one side of the mounting block (16) on the outer side of the right outer ring (15). One end of the bolt (19) passes through the mounting hole (17) and is threaded into the threaded hole (18).

5. The wind turbine gearbox bearing structure according to claim 1, characterized in that: The outer ring (1) of the bearing has oil injection holes (20) on both sides. The other end of each oil injection hole (20) is connected to the inner roller groove (12). An oil injection nozzle (21) is fixedly connected to the opening at the outer end of the oil injection hole (20).

6. The wind turbine gearbox bearing structure according to claim 1, characterized in that: The elastic support assembly (7) includes at least two coaxially arranged semi-cylindrical bearing steel layers (22), and multiple rubber elastomers (23) are solidified between adjacent two layers of bearing steel layers (22) by vulcanization. The multiple rubber elastomers (23) are divided into multiple columns by axial partition grooves (24) and into multiple rows by circumferential partition grooves (25).

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