Main shaft bearing device of wind driven generator unit
By adopting a combined structure of thrust bearing housing, thrust disc and thrust elastic component on the main shaft of the wind turbine generator, the problems of high cost and complex assembly of main bearing modification are solved, and simple and low cost axial load bearing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-24
- Publication Date
- 2026-04-03
AI Technical Summary
Modifying the bearings on the main shaft of existing wind turbine generators is costly and involves a complex assembly process. In particular, when the main bearing is subjected to a large axial load, the improvement methods of traditional rolling bearings and sliding bearings require disassembly and reassembly, resulting in high costs and difficulties.
It adopts a combined structure of thrust bearing housing, thrust plate, thrust plate and thrust elastic component. The axial load is offset by the compression deformation of the thrust elastic component, so as to realize the bearing of axial load. It can be simply assembled on the original bearing.
It reduced the cost of main bearing modification, simplified the assembly process, reduced assembly difficulty, and achieved effective axial load bearing without changing the main shaft structure.
Smart Images
Figure CN121782274A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of wind power generation, and in particular to a main shaft bearing device for a wind turbine generator set. Background Technology
[0002] The main bearings on the main shaft of wind turbine generators are generally rolling bearings. However, in recent years, with the increase in blade length, the power of wind turbine generators has also increased, leading to a greater axial load on the main shaft. Rolling bearings primarily bear radial loads, and although some types of rolling bearings can withstand axial loads, the load they can bear is limited. Therefore, to improve the current situation of the main shaft, some companies have begun to study how to install sliding bearings on the main shaft to bear the axial load.
[0003] Currently, there are two main methods for improving the bearings on the spindle: one is to combine rolling bearings and sliding bearings, adapting and modifying them to form a completely new bearing assembly. The other is to modify the sliding bearing so that it can withstand both axial and radial loads.
[0004] However, both of the above methods require removing the original bearings from the main shaft and installing new ones. Given the large number of wind power units in my country, installing new bearings is not only extremely costly, but the different assembly processes required for bearings produced using different modification methods also complicate the assembly process and increase assembly difficulty. Summary of the Invention
[0005] To reduce the cost of modifying the bearings on the main shaft, and to simplify the assembly process and reduce the assembly difficulty, this application provides a main shaft bearing device for wind turbine generator sets.
[0006] The technical solution for the main shaft bearing device of a wind turbine generator provided in this application is as follows: A wind turbine generator main shaft bearing assembly includes an original bearing mounted on the main shaft, and further includes: A thrust bearing housing is sleeved on the main shaft and located on the side of the original bearing away from the blades. The thrust bearing housing is detachably connected to the original bearing. A thrust plate is located inside the thrust bearing housing. A locking sleeve is provided on the main shaft that abuts against the thrust plate coaxially. The locking sleeve is located between the thrust plate and the original bearing. The thrust plate and the locking sleeve are detachably connected. Multiple thrust plates are arranged circumferentially around the axis of the main shaft and abut against the side of the thrust disc away from the locking sleeve. The thrust bearing seat is provided with a thrust groove that slides and connects with the thrust plates in a direction parallel to the axis of the main shaft. A thrust elastic component is detachably installed on the thrust bearing seat and connected to the thrust plate. The thrust elastic component is located on the side of the thrust plate away from the thrust disc and is used to push the thrust plate against the thrust disc.
[0007] By adopting the above technical solution, when the main shaft is subjected to axial load impact, the main shaft tends to move away from the blades. The locking sleeve then presses against the thrust plate, and the thrust plate presses against the thrust elastic component, causing the thrust elastic component to undergo compression deformation. Since the thrust bearing seat is installed on the original bearing, the thrust bearing seat is stable. Therefore, the thrust elastic component pushes the thrust plate to move towards the thrust plate, canceling out the two opposing thrust forces around the thrust plate, thereby achieving the bearing of the axial load of the main shaft. The entire wind turbine main shaft bearing assembly only needs to be connected and assembled with the original bearings (rolling bearings or sliding bearings) on the main shaft. The installation steps are simple, thereby reducing the cost of modifying the bearings on the main shaft, simplifying the assembly process, and reducing the assembly difficulty.
[0008] Optionally, the thrust elastic component includes a thrust nut, an elastic element, and a limiting element; The thrust bearing housing has a threaded hole for threaded connection of a thrust nut along the axis parallel to the main shaft. The thrust bearing housing has an adjustment cavity for installing an elastic element between the threaded hole and the thrust groove. The threaded hole, adjustment cavity, and thrust groove are interconnected along the axis parallel to the main shaft. The two ends of the elastic element abut against the thrust nut and the thrust plate, respectively. The limiting element is located in the adjustment cavity and connected to the elastic element. The limiting element is used to limit the deformation of the elastic element along the axis of the main shaft.
[0009] Optionally, the limiting component includes a limiting slider and a limiting post; The limiting slider is slidably installed in the thrust groove and abuts against the thrust plate. The limiting post is arranged along the axis parallel to the main shaft and is detachably installed on the thrust nut. The elastic element is sleeved on the limiting post. The limiting slider has a first limiting groove on the side facing the thrust nut, which is coaxially sleeved on the limiting post. The first limiting groove has an adjustment gap for the axial sliding of the limiting post.
[0010] Optionally, the thrust bearing housing includes a first bearing housing and a second bearing housing sequentially sleeved on the main shaft. The first bearing housing is connected to the original bearing and the second bearing housing. The first bearing housing and the second bearing housing have assembly chambers for accommodating the locking sleeve and the thrust plate. The thrust elastic component is located in the second bearing housing.
[0011] Optionally, the thrust plate has a first slot that engages coaxially with the locking sleeve.
[0012] Optionally, a lubrication gap for placing lubricant is provided between the thrust plate and the second bearing seat, and a first sealing ring and a second sealing ring are provided at intervals between the thrust plate and the second bearing seat, with the lubrication gap located between the first sealing ring and the second sealing ring.
[0013] Optionally, the lubrication gap is Z-shaped and includes a first gap, a second gap, and a third gap connected in sequence. The outer peripheral wall of the thrust plate is arranged in a stepped manner. The first gap is located between the first outer peripheral wall of the thrust plate and the inner side wall of the second bearing seat. The second gap is located between the side of the thrust plate facing the thrust plate and the inner side wall of the second bearing seat. The third gap is located between the second outer peripheral wall of the thrust plate and the inner side wall of the second bearing seat sleeved on the spindle.
[0014] Optionally, the second bearing housing has a first sealing groove on the side opposite to the first bearing housing that engages with the first sealing ring. The first sealing groove communicates with the first gap, and the first sealing ring abuts against the thrust plate.
[0015] Optionally, the second bearing housing is sleeved on the inner side wall of the main shaft and has a second sealing groove that engages with the second sealing ring. The second sealing groove communicates with the third gap, and the second sealing ring abuts against the thrust plate. The second sealing ring is tightly connected to the limiting pressure plate on the side opposite to the second gap. The second bearing seat is provided with a limiting pressure groove that engages with the limiting pressure plate. The second gap, the second sealing groove and the third gap are all connected to the limiting pressure groove. The diameter of the limiting pressure groove is larger than the diameter of the second sealing groove, and the depth of the second sealing groove is smaller than the thickness of the second sealing ring.
[0016] Optionally, a tilting gap is provided between the groove wall of the first limiting groove 733 and the peripheral wall of the limiting post 732, and the tilting angle range of the limiting post is 1-3 degrees.
[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. When the main shaft is subjected to axial load impact, it tends to move away from the blades. The locking sleeve then presses against the thrust disc, causing the thrust elastic component to compress and deform. Since the thrust bearing seat is installed on the original bearing, the thrust elastic component pushes the thrust plate towards the thrust disc, canceling out the two opposing thrust forces around the thrust plate, thus achieving the bearing of the axial load on the main shaft. The entire wind turbine main shaft bearing assembly only needs to be connected and assembled with the original bearings (rolling bearings or sliding bearings) on the main shaft. The installation steps are simple, thereby reducing the cost of modifying the bearings on the main shaft, simplifying the assembly process, and reducing assembly difficulty. 2. In order to reduce the weight of the accessories and the difficulty of installation, the thrust bearing housing is divided into two parts. The first bearing housing and the second bearing housing are installed one after the other. This not only makes it easier to observe the connection between the locking sleeve and the thrust plate, but also concentrates the thrust elastic components on the second bearing housing, which facilitates the subsequent installation of other components. Both disassembly and maintenance are more convenient, thereby reducing the difficulty of disassembly and assembly. 3. When the thrust disc presses the thrust plate towards the elastic element, the elastic element also presses the thrust plate towards the thrust disc. The force applied by the elastic element to the thrust plate changes with the pressing force of the thrust disc on the thrust plate, thereby canceling out the force on the thrust plate and maintaining the stability of the force at the original bearing, thus bearing the axial load on the spindle. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of a wind turbine generator main shaft bearing device according to this application.
[0019] Figure 2 This is a schematic diagram of the internal structure of the original bearing and the thrust bearing housing in the embodiments of this application.
[0020] Figure 3 This is a schematic diagram showing the connection between the thrust elastic component and the thrust plate in an embodiment of this application.
[0021] Figure 4 This is a schematic diagram showing the location of the assembly chamber in an embodiment of this application.
[0022] Figure 5 This is a schematic diagram of the thrust elastic component in the embodiments of this application.
[0023] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle.
[0024] In the diagram: 1. Main shaft; 2. Original bearing; 3. Thrust bearing housing; 31. First bearing housing; 32. Second bearing housing; 321. Thrust groove; 322. Threaded hole; 323. Adjustment cavity; 324. First sealing groove; 325. Second sealing groove; 326. Limiting groove; 33. Assembly chamber; 34. Lubrication clearance; 341. First clearance; 342. Second clearance; 343. Third clearance; 4. Thrust plate; 1. First slot; 5. Locking sleeve; 6. Thrust plate; 7. Thrust elastic component; 71. Thrust nut; 711. Second limiting groove; 712. Third limiting groove; 72. Elastic component; 73. Limiting component; 731. Limiting slider; 732. Limiting post; 733. First limiting groove; 734. Adjustable gap; 735. Tilting gap; 74. Gasket; 8. First sealing ring; 9. Second sealing ring; 10. Limiting pressure plate. Detailed Implementation
[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.
[0026] This application discloses a main shaft bearing device for a wind turbine generator set. (Refer to...) Figure 1-3 This includes the original bearing 2 mounted on the spindle 1, and: The thrust bearing housing 3 is sleeved on the main shaft 1 and located on the side of the original bearing 2 away from the blade. The thrust bearing housing 3 and the original bearing 2 can be detachably connected by bolts or other means, without disassembling the original bearing 2 or modifying the original bearing 2.
[0027] The thrust plate 4 is located inside the thrust bearing housing 3. The main shaft 1 is provided with a locking sleeve 5 that abuts against the thrust plate 4 on the same axis. The locking sleeve 5 is located between the thrust plate 4 and the original bearing 2. The thrust plate 4 and the locking sleeve 5 are detachably connected by bolts or other means so that changes at the main shaft 1 can be transmitted to the thrust plate 4. The thrust plate 4 changes together with the main shaft 1.
[0028] Multiple thrust plates 6 are arranged circumferentially around the axis of the main shaft 1 and abut against the side of the thrust plate 4 away from the locking sleeve 5. The thrust bearing seat 3 is provided with a thrust groove 321 that slides and connects with the thrust plates 6 in a direction parallel to the axis of the main shaft 1.
[0029] The thrust elastic component 7 is detachably installed on the thrust bearing seat 3 and connected to the thrust plate 6. The thrust elastic component 7 is located on the side of the thrust plate 6 away from the thrust disc 4 and is used to push the thrust plate 6 against the thrust disc 4.
[0030] When the spindle 1 is subjected to an axial load impact, the spindle 1 tends to move away from the blades. The locking sleeve 5, being integrally assembled with the spindle 1, presses against the thrust plate 4. The thrust plate 4 presses against the thrust strip 6 towards the thrust elastic component 7. Multiple thrust strips 6 share the force and distribute the thrust at the thrust plate 4, reducing the stress on each thrust elastic component 7, causing the thrust elastic component 7 to undergo compressive deformation. Since the thrust bearing housing 3 is installed on the original bearing 2, the position of the thrust bearing housing 3 is stable. Therefore, the thrust elastic component 7 pushes the thrust strip 6 to move towards the thrust plate 4, canceling out the two opposing thrusts around the thrust strip 6, thereby achieving the bearing of the axial load of the spindle 1.
[0031] The entire wind turbine generator main shaft 1 bearing assembly only requires connecting and assembling the original bearing 2 on the original main shaft 1. This application's wind turbine generator main shaft 1 bearing assembly can complete the modification without altering the original structure of the wind turbine generator main shaft 1. Whether the original wind turbine generator main shaft 1 structure uses common rolling bearings or the recently applied sliding bearings, the modification in this application is feasible, with a wide range of applications, low modification cost, and simple modification steps, making it suitable for large-scale modifications.
[0032] To reduce the weight and difficulty of parts during installation, refer to Figure 2 and Figure 3 The thrust bearing housing 3 is disassembled into two parts: a first bearing housing 31 and a second bearing housing 32, which are sequentially fitted onto the main shaft 1. The first bearing housing 31 is connected and assembled with the original bearing housing 2 and the second bearing housing 32 by bolts and other connecting parts. The first bearing housing 31 and the second bearing housing 32 have assembly chambers 33 for accommodating the locking sleeve 5 and the thrust plate 4, so as to install the second bearing housing 32 after the thrust plate 4 is installed. The thrust groove 321 is opened in the second bearing housing 32, and the thrust elastic component 7 is set in the second bearing housing 32 to facilitate the assembly of the thrust elastic component 7 and the thrust bearing housing 3, reducing the assembly difficulty.
[0033] Reference Figure 3 and Figure 4 The thrust elastic component 7 includes a thrust nut 71, an elastic element 72, and a limiting element 73.
[0034] The second bearing housing 32 has a threaded hole 322 that is threaded to the thrust nut 71 along the axis parallel to the main shaft 1. The thrust bearing housing 3 has an adjustment cavity 323 for installing the elastic element 72 between the threaded hole 322 and the thrust groove 321. The threaded hole 322, the adjustment cavity 323 and the thrust groove 321 are interconnected along the axis parallel to the main shaft 1. The two ends of the elastic element 72 abut against the thrust nut 71 and the thrust plate 6, respectively.
[0035] In addition, the limiting member 73 includes a limiting slider 731 and a limiting post 732.
[0036] The limiting slider 731 is slidably mounted on the thrust groove 321 and abuts against the thrust plate 6. The limiting post 732 is arranged along the axis parallel to the main shaft 1 and is detachably connected to the thrust nut 71. The elastic element 72 is sleeved on the limiting post 732, thereby limiting the shape and deformation direction of the elastic element 72, so that the elastic element 72 deforms along the axis of the limiting post 732. The elastic element 72 can be a disc spring, spring, elastic pad, or other materials or workpieces. The limiting slider 731 has a first limiting groove 733 on the side facing the thrust nut 71, which is coaxially sleeved on the limiting post 732. The first limiting groove 733 has an adjustment gap 734 for the axial sliding of the limiting post 732.
[0037] The elastic element 72 enables the thrust plate 6 to continuously press against the thrust disc 4. When the thrust disc 4 presses the thrust plate 6 towards the elastic element 72, the elastic element 72 also presses the thrust plate 6 towards the thrust disc 4. The limiting slider 731 increases the thrust area of the entire thrust elastic assembly 7 on the thrust plate 6, making the thrust direction more stable and reducing force loss during transmission. The force applied by the elastic element 72 to the thrust plate 6 varies with the pressing force of the thrust disc 4 on the thrust plate 6, achieving force cancellation at the thrust plate 6, maintaining the stability of the force at the original bearing 2, and thus bearing the axial load on the spindle 1. The installation of the thrust nut 71 not only facilitates the installation of the elastic element 72 and the thrust plate 6, but also allows for flexible adjustment of the clamping force between the thrust nut 71 and the elastic element 72 according to external conditions.
[0038] In addition, such as Figure 4 and 5 As shown, to ensure the deformation range of the elastic element 72, the depth of the adjusting gap 734 is less than the deformation range of the elastic element 72, so as to ensure that the elastic element 72 continuously presses against the thrust plate 6. In order to limit the positioning post 732 and the elastic element 72 during installation, the thrust nut 71 is provided with a second limiting groove 711 that engages with the limiting post 732 and a third limiting groove 712 that engages with the elastic element 72 in sequence, so as to prevent the limiting post 732 and the elastic element 72 from shaking, improve the stability of the entire structure, and reduce the assembly difficulty.
[0039] like Figure 4 and Figure 5 As shown, to make the force at the elastic element 72 more stable, both ends of the elastic element 72 are abutted by washers 74. The washers 74 are coaxially sleeved on the limiting post 732, with one washer 74 pressing against the limiting slider 731 and the other washer 74 pressing against the bottom of the third limiting groove 712. This not only makes the thrust force transmitted from the thrust plate 6 to the elastic element 72 more stable, but also makes the thrust force transmitted from the elastic element 72 to the thrust plate 6 more stable. At the same time, it increases the contact area between the elastic element 72 and the limiting slider 731 and the thrust nut 71, reducing wear.
[0040] Reference Figure 3 and Figure 4 The thrust plate 4 has a first groove 41 that coaxially engages with the locking sleeve 5. This ensures that the thrust plate 4 not only abuts against the axial side wall of the locking sleeve 5 but also against the radial peripheral wall of the locking sleeve 5. On the one hand, this increases the contact area between the thrust plate 4 and the locking sleeve 5 in different directions, allowing the thrust plate 4 to continuously abut against the locking sleeve 5 regardless of whether the spindle 1 is subjected to axial impact or bending deformation. On the other hand, it positions the thrust plate 4, facilitating the subsequent installation of the second bearing seat 32 and the thrust elastic component 7, ensuring the stability of the connection between the thrust elastic component 7 and the thrust plate 4.
[0041] Because the main shaft 1 rotates with the blades, the thrust plate 4 and thrust washers 6 are frequently subjected to axial force impacts. To protect the components, extend the service life of the entire device, and reduce damage, refer to... Figure 3 and Figure 4 A lubrication gap 34 for placing lubricant is provided between the thrust plate 4 and the second bearing housing 32. The lubricant is preferably grease. To prevent lubricant leakage, a first sealing ring 8 and a second sealing ring 9 are provided at an interval between the thrust plate 4 and the second bearing housing 32, and the lubrication gap 34 is located between the first sealing ring 8 and the second sealing ring 9. The shapes of the lubrication gap 34 and the thrust plate 4 are specially designed to maximize the filling of lubricant between the thrust plate 4 and the thrust disc 6.
[0042] First, the outer peripheral wall of the thrust disc 4 is a stepped outer peripheral wall with a diameter that gradually decreases in the direction away from the original bearing 2. The outer peripheral wall of the thrust disc 4 includes a first outer peripheral wall and a second outer peripheral wall. The inner peripheral wall of the second bearing seat 32 is a stepped inner peripheral wall that matches the outer peripheral wall of the thrust disc 4. Therefore, as shown in the figure, the lubrication gap 34 is arranged in a "Z" shape and includes a first gap 341, a second gap 342, and a third gap 343 that are connected in sequence.
[0043] The first gap 341 is located between the first outer peripheral wall of the thrust disc 4 and the inner wall of the second bearing seat 32. The second gap 342 is located between the side of the thrust disc 4 facing the thrust plate 6 and the inner wall of the second bearing seat 32. The third gap 343 is located between the second outer peripheral wall of the thrust disc 4 and the inner wall of the second bearing seat 32 fitted onto the spindle 1. The first sealing ring 8 is located at the first gap 341, and the second sealing ring 9 is located at the third gap 343. This ensures that the second gap 342 is completely filled with lubricant, while preventing the thrust disc 4 from contacting the second bearing seat 32. It also ensures that the thrust disc 4 and the thrust bearing seat 3 transmit and dissipate force through the thrust elastic component 7, thereby achieving the bearing of the axial force on the spindle 1.
[0044] In addition, to facilitate the installation of the first sealing ring 8, such as Figure 3 and Figure 4 As shown, the second bearing housing 32 has a first sealing groove 324 on the side facing the first bearing housing 31, which engages with the first sealing ring 8. The first sealing groove 324 communicates with the first gap 341. After the first bearing housing 31 is installed, the first sealing ring 8 is placed in the first sealing groove 324, and then the second bearing housing 32 is installed on the first bearing housing 31. At this time, the first sealing ring 8 is deformed by the compression of the second bearing housing 32 and the first bearing housing 31, thereby causing the first sealing ring 8 to press against the first bearing housing 31, the second bearing housing 32 and the thrust plate 4, thus sealing the first gap 341.
[0045] In addition, in order to facilitate the installation of the second sealing ring 9, the second bearing seat 32 is sleeved on the inner side wall of the main shaft 1 and has a second sealing groove 325 that engages with the second sealing ring 9. The second sealing groove 325 communicates with the third gap 343. The second sealing ring 9 is located in the second sealing groove 325 and abuts against the thrust plate 4, thereby achieving the sealing of the third gap 343.
[0046] To facilitate the installation of the second sealing ring 9, such as Figure 4 As shown, the second sealing ring 9 is tightly connected to the limiting pressure plate 10 on the side facing the second gap 342. The second bearing seat 32 has a limiting pressure groove 326 that engages with the limiting pressure plate 10. The diameter of the limiting pressure groove 326 is larger than the diameter of the second sealing groove 325. The second gap 342, the second sealing groove 325, and the third gap 343 are all connected to the limiting pressure groove 326. The second sealing ring 9 can be inserted into the second sealing groove 325 through the limiting pressure groove 326, reducing installation difficulty and enabling rapid installation.
[0047] To enhance the sealing effect, the depth of the second sealing groove 325 is less than the thickness of the second sealing ring 9. After the second sealing ring 9 is placed in the second sealing groove 325, part of the second sealing ring 9 will be located in the limiting pressure groove 326. By placing the limiting pressure plate 10 into the limiting pressure groove 326 to press the second sealing ring 9, the second sealing ring 9 will deform to press against the groove wall of the second sealing groove 325 and the thrust plate 4, thus ensuring the seal of the third gap 343.
[0048] Reference Figure 2 and Figure 3 Due to the weight of the blade itself and its position on the main shaft 1, the end of the main shaft 1 near the blade will be slightly bent and deformed over time, resulting in a certain tilt angle. Since the thrust plate 4 has a first slot 41 that is coaxially engaged with the locking sleeve 5, the thrust plate 4 can deform together with the locking sleeve 5.
[0049] To prevent the thrust plate 6 from not being fully attached to the thrust disc 4 due to this situation, a tilting structure needs to be provided on the thrust bearing seat 3. The tilting structure is formed by the interaction of the various components that have been provided in this application.
[0050] like Figure 5 and Figure 6As shown, a gap is maintained between the thrust plate 4 and the thrust bearing seat 3 through two elastic structures: the first sealing ring 8 and the second sealing ring 9. This gap can be set according to the required tilt angle. The elastic element 72 has low rigidity. A tilting gap 735 is provided between the groove wall of the first limiting groove 733 of the limiting slider 731 and the limiting post 732. The tilting gap 735 is arranged around the limiting post 732, facilitating the tilting of the limiting post 732. This allows the thrust plate 6 and the thrust plate 4 to fit tightly together, ensuring the contact area between the thrust plate 6 and the thrust plate 4 during operation and reducing the contact pressure between them.
[0051] To ensure the above-mentioned effects, the thrust disc 4 is typically made of metal, preferably 42% chromium molybdenum, with a tempered hardness of HB240-300. This treatment gives the thrust disc 4 strong hardness and wear resistance, as well as a certain degree of toughness. The thrust plate 6 is preferably made of a polymer material, which has good wear resistance and toughness. This ensures that the contact area between the thrust plate 6 and the thrust disc 4 is maintained within the tilt angle range of 1-3 degrees during operation.
[0052] The implementation principle of the bearing device for the main shaft 1 of a wind turbine generator set according to this application embodiment is as follows: When the main shaft 1 is subjected to axial load impact, the main shaft 1 will drive the locking sleeve 5 to produce a slight displacement in the direction away from the blades. At this time, the locking sleeve 5 presses against the thrust plate 4. The thrust plate 4 transmits the impact force to the elastic element 72 through the thrust plate 6 and the limiting slider 731. Since the thrust bearing seat 3 is connected to the original bearing 2, the position of the thrust bearing seat 3 does not move, and the elastic element 72 deforms to absorb the impact force transmitted to itself. The two opposing forces around the thrust plate 6 cancel each other out, thereby realizing the bearing of the axial load of the main shaft 1. The entire bearing device for the main shaft 1 of the wind turbine generator set only needs to be connected and assembled to the original bearing 2 on the original main shaft 1. The installation steps are simple, thereby reducing the modification cost on the main shaft 1, and simplifying the assembly process and reducing the assembly difficulty.
[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A wind turbine generator main shaft bearing assembly, comprising a primary bearing (2) mounted on the main shaft (1), characterized in that, Also includes; The thrust bearing housing (3) is sleeved on the main shaft (1) and located on the side of the original bearing (2) away from the blade. The thrust bearing housing (3) and the original bearing (2) are detachably connected. The thrust plate (4) is located inside the thrust bearing seat (3). A locking sleeve (5) is provided on the main shaft (1) and abuts against the thrust plate (4) coaxially. The locking sleeve (5) is located between the thrust plate (4) and the original bearing (2). The thrust plate (4) and the locking sleeve (5) are detachably connected. Thrust plates (6) are arranged in multiple circumferentially around the axis of the main shaft (1) and abut against the side of the thrust plate (4) away from the locking sleeve (5). The thrust bearing seat (3) is provided with a thrust groove (321) that slides and connects with the thrust plates (6) in a direction parallel to the axis of the main shaft (1). The thrust elastic component (7) is detachably installed on the thrust bearing seat (3) and connected to the thrust plate (6). The thrust elastic component (7) is located on the side of the thrust plate (6) away from the thrust disc (4) and is used to push the thrust plate (6) against the thrust disc (4).
2. The wind turbine generator main shaft bearing device according to claim 1, characterized in that: The thrust bearing housing (3) includes a first bearing housing (31) and a second bearing housing (32) sequentially fitted onto the main shaft (1). The first bearing housing (31) connects the original bearing (2) housing and the second bearing housing (32). The first bearing housing (31) and the second bearing housing (32) have assembly chambers (33) for accommodating the locking sleeve (5) and the thrust plate (4). The thrust elastic component (7) is located inside the second bearing housing (32).
3. The wind turbine generator main shaft bearing device according to claim 1, characterized in that: The thrust elastic component (7) includes a thrust nut (71), an elastic element (72), and a limiting element (73); The thrust bearing housing (3) has a threaded hole (322) for threaded connection of the thrust nut (71) along the axial direction parallel to the main shaft (1). The thrust bearing housing (3) has an adjustment cavity (323) for installing the elastic element (72) between the threaded hole (322) and the thrust groove (321). The threaded hole (322), the adjustment cavity (323) and the thrust groove (321) are interconnected along the axial direction parallel to the main shaft (1). The two ends of the elastic element (72) abut against the thrust nut (71) and the thrust plate (6) respectively. The limiting member (73) is located in the adjustment cavity (323) and connected to the elastic element (72). The limiting member (73) is used to limit the deformation of the elastic element (72) along the axial direction of the main shaft (1).
4. The wind turbine generator main shaft bearing device according to claim 3, characterized in that: The limiting component (73) includes a limiting slider (731) and a limiting post (732). The limiting slider (731) is slidably installed in the thrust groove (321) and abuts against the thrust plate (6). The limiting post (732) is arranged along the axis parallel to the main shaft (1) and is detachably installed on the thrust nut (71). The elastic element (72) is sleeved on the limiting post (732). The limiting slider (731) has a first limiting groove (733) coaxially sleeved on the side of the limiting post (732) facing the thrust nut (71). The first limiting groove (733) has an adjustment gap (734) for the axial sliding of the limiting post (732).
5. The wind turbine generator main shaft bearing device according to claim 1, characterized in that: The thrust plate (4) has a first slot (41) that is coaxially engaged with the locking sleeve (5).
6. The wind turbine generator main shaft bearing device according to claim 2, characterized in that: A lubrication gap (34) for placing lubricant is provided between the thrust plate (4) and the second bearing seat (32). A first sealing ring (8) and a second sealing ring (9) are provided at intervals between the thrust plate (4) and the second bearing seat (32). The lubrication gap (34) is located between the first sealing ring (8) and the second sealing ring (9).
7. The wind turbine generator main shaft bearing device according to claim 6, characterized in that: The lubrication gap (34) is Z-shaped and includes a first gap (341), a second gap (342) and a third gap (343) connected in sequence. The outer peripheral wall of the thrust plate (4) is arranged in a stepped manner. The first gap (341) is located between the first outer peripheral wall of the thrust plate (4) and the inner wall of the second bearing seat (32). The second gap (342) is located between the side of the thrust plate (4) facing the thrust plate (6) and the inner wall of the second bearing seat (32). The third gap (343) is located between the second outer peripheral wall of the thrust plate (4) and the inner wall of the second bearing seat (32) fitted onto the spindle (1).
8. The wind turbine generator main shaft bearing device according to claim 7, characterized in that: The second bearing housing (32) has a first sealing groove (324) on the side opposite to the first bearing housing (31) that engages with the first sealing ring (8). The first sealing groove (324) communicates with the first gap (341), and the first sealing ring (8) abuts against the thrust plate (4).
9. A wind turbine generator main shaft bearing device according to claim 7, characterized in that: The second bearing housing (32) is sleeved on the inner side wall of the main shaft (1) and has a second sealing groove (325) that engages with the second sealing ring (9). The second sealing groove (325) communicates with the third gap (343), and the second sealing ring (9) abuts against the thrust plate (4). The second sealing ring (9) is tightly connected to the limiting pressure plate (10) on the side facing the second gap (342). The second bearing seat (32) is provided with a limiting pressure groove (326) that engages with the limiting pressure plate (10). The second gap (342), the second sealing groove (325) and the third gap (343) are all connected to the limiting pressure groove (326). The diameter of the limiting pressure groove (326) is larger than the diameter of the second sealing groove (325), and the depth of the second sealing groove (325) is smaller than the thickness of the second sealing ring (9).
10. A wind turbine generator main shaft bearing device according to claim 4, characterized in that: A tilting gap (735) is provided between the groove wall of the first limiting groove (733) and the peripheral wall of the limiting post (732), and the tilting angle range of the limiting post (732) is 1-3 degrees.