Bearing assembly, shaft system and wind generating set
By adopting a double-row bearing assembly layout in the wind turbine set and using the combined structure of the first bearing and the second bearing, the problem of insufficient bearing capacity of the bearing assembly is solved, and the effect of reducing costs and improving bearing capacity is achieved.
Patent Information
- Application Number
- CN202323665354.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-29
AI Technical Summary
In current wind turbines, the bearing assembly load capacity is insufficient, resulting in an increase in bearing size and cost, and it is impossible to effectively cope with the increased aerodynamic and gravity loads.
A double-row bearing assembly layout is adopted, wherein the first bearing and the second bearing are arranged axially adjacently along the rotation axis. The first bearing bears radial and axial loads, and the second bearing bears radial loads. By combining the same bearing seat, the Single bearing size and cost.
It improves the bearing capacity of bearing components, reduces the manufacturing cost of bearing components, and enhances the operating reliability of wind turbine units.
Smart Images
Figure CN222141789U_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a bearing assembly, a shaft system and a wind turbine generator set. Background Art
[0002] At present, wind turbines are showing a significant trend of large-scale development, and the gravity and aerodynamic loads of the whole machine are increasing. At present, wind turbines usually adopt a shaft layout with two single-row tapered roller bearings. The front bearing adopts a single-row tapered roller bearing, which mainly bears the aerodynamic load, gravity load and inertia load from the impeller of the wind turbine. In order to meet the requirements of load-bearing and fatigue performance, the size of the bearings is constantly increasing, which leads to an increase in the cost of the bearings on the one hand, and on the other hand, it also leads to a corresponding increase in the size of the shaft and bearing seat assembled with it, and the resulting further cost increase. Utility Model Content
[0003] The main purpose of the present disclosure is to provide a bearing assembly, a shaft system and a wind turbine generator set to improve the load-bearing capacity of the bearing assembly.
[0004] In view of the above objectives, the present disclosure provides the following technical solutions:
[0005] According to a first aspect of the present disclosure, a bearing assembly is provided, which is suitable for a wind turbine generator set. The bearing assembly includes a bearing seat, a first bearing and a second bearing. The bearing seat is provided with a shaft mounting hole for the shaft to pass through. The first bearing and the second bearing are arranged between the shaft and the bearing seat, and the first bearing and the second bearing are adjacently arranged along the axial direction of the shaft. The first bearing can withstand radial loads and axial loads, and the second bearing can withstand radial loads.
[0006] In the first exemplary embodiment of the present disclosure, the rotating shaft is the main shaft of the wind turbine generator set, and the wind turbine generator set also includes a hub and a generator, the first end of the main shaft is connected to the hub, the second end of the main shaft is connected to the rotor of the generator, the first bearing and the second bearing are located at the first end of the main shaft, and the first bearing is arranged close to the hub relative to the second bearing.
[0007] Optionally, the first bearing includes a first tapered roller bearing or a thrust ball bearing, and the second bearing includes a cylindrical roller bearing or a radial ball bearing.
[0008] Specifically, the first bearing includes a first tapered roller bearing or a thrust ball bearing, and the second bearing includes a cylindrical roller bearing or a radial ball bearing.
[0009] Further, the stepped shaft includes a first shoulder and a second shoulder arranged at intervals along the axial direction of the rotating shaft, the first shoulder is arranged close to the wheel hub relative to the second shoulder, and the radius of the first shoulder is greater than the radius of the second shoulder, and a third shoulder and a fourth shoulder arranged at intervals along the axial direction of the rotating shaft are arranged in the rotating shaft mounting hole of the bearing seat, the third shoulder is arranged close to the wheel hub relative to the fourth shoulder, and the radius of the third shoulder is greater than the radius of the fourth shoulder, the first shoulder is arranged on the side of the first bearing facing the wheel hub, and the first inner ring of the first bearing abuts against the first shoulder, the third shoulder is arranged on the side of the first bearing facing away from the wheel hub, and the first outer ring of the first bearing abuts against the third shoulder, the second shoulder is arranged on the side of the second bearing facing the first bearing, the second inner ring of the second bearing abuts against the second shoulder, and the fourth shoulder is arranged on the side of the second bearing facing away from the first bearing, and the second outer ring of the second bearing abuts against the fourth shoulder.
[0010] According to another exemplary embodiment of the present disclosure, the bearing assembly includes a first spacer ring and a second spacer ring, the first spacer ring is sleeved on the rotating shaft and is located between the second shaft shoulder and the second inner ring along the axial direction of the rotating shaft, the first spacer ring does not protrude beyond the second shaft shoulder along the radial direction of the rotating shaft, and the second spacer ring is sleeved on the rotating shaft and abuts against a side of the second inner ring away from the wheel hub.
[0011] Optionally, the bearing assembly further includes a third spacer ring, which is arranged radially outward of the first spacer ring, and the axial ends of the third spacer ring are respectively pressed against the first outer ring of the first bearing and the second outer ring of the second bearing.
[0012] Specifically, the inner diameter of the third spacer ring is not less than the inner diameter of the first outer ring and the inner diameter of the second outer ring.
[0013] Furthermore, the bearing assembly further comprises a second tapered roller bearing arranged at the second end of the main shaft, and the first tapered roller bearing and the second tapered roller bearing are arranged face to face or back to back.
[0014] According to a second aspect of the present disclosure, a shaft system is provided, which includes a rotating shaft and a bearing assembly as described above, wherein the rotating shaft is rotatably disposed in the rotating shaft mounting hole, and the first bearing and the second bearing are respectively disposed between the rotating shaft and the bearing seat.
[0015] According to a third aspect of the present disclosure, a wind turbine generator set is provided, wherein the wind turbine generator set comprises the shaft system as described above.
[0016] The bearing assembly, shaft system and wind turbine generator set provided by the present invention have at least the following distinguishing technical features: the shaft system provided by the present invention includes a first bearing and a second bearing, and the first bearing and the second bearing are adjacently arranged along the axial direction of the rotating shaft. Such a layout does not require increasing the size of a single bearing, thereby improving the load-bearing capacity of the bearing assembly and reducing the cost of the bearing assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:
[0018] Figure 1 A longitudinal sectional view of a shaft system provided for an exemplary embodiment of the present disclosure.
[0019] Figure 2 for Figure 1 A partial enlarged view of the structure indicated by circle I.
[0020] Description of reference numerals:
[0021] 10. First bearing; 20. Second bearing;
[0022] 40. Bearing seat; 1. First outer ring;
[0023] 2. First inner ring; 3. Second outer ring;
[0024] 4. Second inner ring; 5. First spacer ring;
[0025] 6. Second spacer ring; 7. Third spacer ring;
[0026] 8. Rotating shaft; 81. First shaft shoulder;
[0027] 82, second shoulder; 41, third shoulder;
[0028] 42. Fourth shaft shoulder; 30. Second tapered roller bearing;
[0029] 9. End cap. DETAILED DESCRIPTION
[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the implementation of the present disclosure is limited to the embodiments set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.
[0031] In one aspect of the present disclosure, a bearing assembly is provided, which is suitable for a wind turbine generator set. The wind turbine generator set includes a tower, an impeller and a generator arranged on the top of the tower, and a shaft system connected between the generator and the impeller, and the shaft system can transmit the rotation of the impeller to the rotor of the generator, thereby driving the generator to generate electricity.
[0032] Reference Figure 1 and Figure 2 In an exemplary embodiment of the present disclosure, the shaft system includes a rotating shaft 8 and a bearing assembly, wherein the bearing assembly includes a bearing seat 40, a first bearing 10 and a second bearing 20 disposed between the rotating shaft 8 and the bearing seat 40. The bearing seat 40 is provided with a rotating shaft mounting hole for the rotating shaft 8 to pass through, and the rotating shaft 8 is rotatably disposed in the rotating shaft mounting hole. The first bearing 10 and the second bearing 20 are disposed between the rotating shaft 8 and the bearing seat 40, and the first bearing 10 and the second bearing 20 are adjacently disposed along the axial direction of the rotating shaft 8, the first bearing 10 can bear radial loads and axial loads, and the second bearing 20 can bear radial loads.
[0033] The bearing assembly disclosed in the present invention includes a first bearing 10 and a second bearing 20 adjacently arranged along the axial direction of the rotating shaft 8 to share the aerodynamic load, gravity load and inertial load of the main shaft. The manufacturing cost of larger-sized bearing assemblies is significantly increased. The present invention does not need to increase the size of a single bearing, thereby reducing the manufacturing cost of the bearing assembly.
[0034] In this embodiment, the first bearing 10 and the second bearing 20 are arranged adjacent to each other, so the first bearing 10 and the second bearing 20 can use the same bearing seat 40. In this way, the bearing seat 40, the first bearing 10 and the second bearing 20 form a combined bearing, which can further reduce the manufacturing cost of the bearing assembly.
[0035] As an example, in this embodiment, the rotating shaft 8 is the main shaft of the wind turbine generator set, and the wind turbine generator set also includes a hub and a generator. The first end of the main shaft is connected to the hub, and the second end of the main shaft is connected to the rotor of the generator. The first bearing 10 and the second bearing 20 are located at the first end of the main shaft. When the hub rotates, the main shaft transmits the rotation of the hub to the rotor of the generator, thereby driving the rotor to rotate to achieve power generation of the generator.
[0036] In this embodiment, the first bearing 10 and the second bearing 20 are arranged at the first end of the main shaft so as to be close to the hub. During the operation of the wind turbine generator set, the first bearing 10 and the second bearing 20 bear the aerodynamic load, gravity load and inertia load of the impeller of the wind turbine generator set, thereby improving the bearing capacity of the shaft system. Since the first bearing 10 and the second bearing 20 cooperate, there is no need to increase the size of a single bearing, and the manufacturing cost of a larger-sized bearing is significantly increased, thereby reducing the manufacturing cost of the shaft system of this embodiment.
[0037] Continuing to refer to the drawings, in this embodiment, the first bearing 10 is arranged close to the wheel hub relative to the second bearing 20, the first bearing 10 includes a first tapered roller bearing or a thrust ball bearing, and the second bearing 20 includes a cylindrical roller bearing or a radial ball bearing. The first bearing 10 mainly bears the axial thrust load along the rotating shaft 8 and part of the radial load along the radial direction of the rotating shaft 8, and the second bearing 20 mainly bears the radial load along the radial direction of the rotating shaft 8. The first bearing 10 and the second bearing 20 are arranged adjacent to each other along the axial direction of the rotating shaft 8. In this way, the bearing capacity of the shaft system is improved by combining the first bearing 10 and the second bearing 20, thereby reducing the manufacturing cost of the shaft system.
[0038] In this embodiment, the inner diameter of the first bearing 10 is larger than the inner diameter of the second bearing 20, and the main shaft is formed as a stepped shaft to match the first bearing 10 and the second bearing 20 respectively, so as to facilitate the positioning and assembly of the shaft system. In this embodiment, the inner diameter of the first bearing 10 is larger than the inner diameter of the second bearing 20, which means that the inner ring aperture of the first bearing 10 along the radial direction of the rotating shaft 8 is larger than the inner ring aperture of the second bearing 20 along the radial direction of the rotating shaft 8.
[0039] Specifically, the stepped shaft includes a first shoulder 81 and a second shoulder 82 which are arranged at axial intervals along the rotating shaft 8. The first shoulder 81 is arranged close to the wheel hub (not shown) relative to the second shoulder 82, and the radius of the first shoulder 81 is greater than the radius of the second shoulder 82. A third shoulder 41 and a fourth shoulder 42 which are arranged at axial intervals along the rotating shaft 8 are arranged in the rotating shaft mounting hole of the bearing seat 40. The third shoulder 41 is arranged close to the wheel hub relative to the fourth shoulder 42, and the radius of the third shoulder 41 is greater than the radius of the fourth shoulder 42.
[0040] In this embodiment, the radius of the first shoulder 81 may be the radius of the circle where the corner of the first shoulder 81 is located. The radius of the second shoulder 82 may be the radius of the circle where the corner of the second shoulder 82 is located. It can be understood that the radius of the first shoulder 81 is greater than the radius of the second shoulder 82, which means that the radial dimension of the first shoulder 81 along the rotating shaft 8 is greater than the radial dimension of the second shoulder 82 along the rotating shaft 8.
[0041] The fact that the radius of the third shoulder 41 is greater than the radius of the fourth shoulder 42 indicates that the third shoulder 41 is disposed outside the fourth shoulder 42 along the radial direction of the rotating shaft 8 .
[0042] The first shoulder 81 is arranged on the side of the first bearing 10 facing the wheel hub, and the first inner ring 2 of the first bearing 10 abuts against the first shoulder 81. The third shoulder 41 is arranged on the side of the first bearing 10 facing away from the wheel hub, and the first outer ring 1 of the first bearing 10 abuts against the third shoulder 41. In this way, the axial positioning of the first bearing 10 is achieved through the cooperation between the first shoulder 81 and the third shoulder 41, and the axial movement of the first bearing 10 relative to the rotating shaft 8 is avoided, thereby improving the reliability of the shaft system.
[0043] Furthermore, the second shoulder 82 is arranged on the side of the second bearing 20 facing the first bearing 10, the second inner ring 4 of the second bearing 20 abuts against the second shoulder 82, the fourth shoulder 42 is arranged on the side of the second bearing 20 facing away from the first bearing 10, and the second outer ring 3 of the second bearing 20 abuts against the fourth shoulder 42. In this way, the axial positioning of the second bearing 20 is achieved through the cooperation between the second shoulder 82 and the fourth shoulder 42, thereby preventing the second bearing 20 from axially moving relative to the rotating shaft 8, thereby improving the reliability of the shaft system.
[0044] In order to improve the reliability of the shaft system, the first inner ring 2 and the rotating shaft 8 are interference fit, the first outer ring 1 and the bearing seat 40 are interference fit, the second inner ring 4 and the rotating shaft 8 are interference fit, and the second outer ring 3 and the bearing seat 40 are interference fit.
[0045] In this embodiment, the radius of the first shoulder 81 is greater than the radius of the second shoulder 82, the radius of the second shoulder 82 is greater than the inner diameter of the second inner ring 4 of the second bearing 20, the radius of the third shoulder 41 is greater than the radius of the fourth shoulder 42, and the radius of the third shoulder 41 is the same as the outer diameter of the second bearing 20, and the outer diameter of the first bearing 10 is greater than the outer diameter of the second bearing 20. This arrangement facilitates the assembly of the shaft system.
[0046] In this embodiment, the radius of the first shoulder 81 may be the radius of the circle where the corner of the first shoulder 81 is located. The radius of the second shoulder 82 may be the radius of the circle where the corner of the second shoulder 82 is located. It can be understood that the radius of the first shoulder 81 is greater than the radius of the second shoulder 82, which means that the radial dimension of the first shoulder 81 along the rotating shaft 8 is greater than the radial dimension of the second shoulder 82 along the rotating shaft 8.
[0047] The fact that the radius of the third shoulder 41 is greater than the radius of the fourth shoulder 42 indicates that the third shoulder 41 is disposed outside the fourth shoulder 42 along the radial direction of the rotating shaft 8 .
[0048] In this embodiment, the assembly order of the shaft system may be to first install the first bearing 10 on the rotating shaft 8 and then install the second bearing 20 on the rotating shaft 8 , but the present invention is not limited thereto.
[0049] In this embodiment, the shaft system includes a first spacer 5 and a second spacer 6. The first spacer 5 is sleeved on the shaft and is located between the second shaft shoulder 82 and the second inner ring 4 along the axial direction of the shaft 8. The first spacer 5 is used to separate the first bearing 10 and the second bearing 20, so as to avoid the first bearing 10 and the second bearing 20 from interfering with each other during the operation of the shaft system. The first spacer 5 does not protrude from the second shaft shoulder 82 along the radial direction of the shaft 8. The second spacer 6 is sleeved on the shaft 8 and abuts against the side of the second inner ring 4 away from the wheel hub. In this way, the first spacer 5 and the second spacer 6 cooperate to position the axial sides of the second inner ring 4, so as to avoid the axial movement of the second inner ring 4 relative to the shaft 8, thereby improving the reliability of the second inner ring 4 and the reliability of the shaft system.
[0050] Furthermore, the shaft system also includes a third spacer ring 7, which is spaced radially outward from the first spacer ring 5, and the axial ends of the third spacer ring 7 are respectively pressed against the outer ring of the first bearing 10 and the outer ring of the second bearing 20, thereby further improving the reliability of the shaft system.
[0051] As an example, the inner diameter of the third spacer ring 7 is not less than the inner diameter of the first outer ring 1 and the inner diameter of the second outer ring 3, thereby avoiding accidental contact between the third spacer ring 7 and the bearing rollers during the operation of the shaft system, thereby improving the reliability of the shaft system.
[0052] It can be understood that the radial inner ring aperture of the third spacer ring 7 along the rotating shaft 8 is not smaller than the radial inner ring minimum aperture of the first outer ring 1 and the radial inner ring aperture of the second outer ring 3 along the rotating shaft 8 .
[0053] Specifically, the assembly steps of the shaft system in this embodiment are:
[0054] Sleeve the first inner ring 2 on the rotating shaft 8 and abut against the first shaft shoulder 81, then sleeve the first spacer 5 on the rotating shaft 8 and abut against the second shaft shoulder 82, sleeve the second inner ring 4 on the rotating shaft 8 and abut against the first spacer 5, then sleeve the second spacer 6 on the rotating shaft 8 and abut against the second inner ring 4, thus completing the assembly of the main shaft sleeve;
[0055] The second outer ring 3 is installed in the bearing seat 40 and abuts against the fourth shaft shoulder 42, and then the third spacer 7 is arranged in the bearing seat 40 and abuts against the second outer ring 3, and then the first outer ring 1 is installed in the bearing seat 40 and abuts against the third spacer 7, so that the assembly of the bearing seat assembly is completed;
[0056] The shafting is completed by fitting the preassembled main shaft sleeve and bearing housing assembly together.
[0057] return Figure 1As an example, the shaft system also includes a second tapered roller bearing 30 disposed at the second end of the main shaft, and the first tapered roller bearing and the second tapered roller bearing 30 are disposed face to face or back to back. The second tapered roller bearing 30 mainly bears the axial thrust load along the rotating shaft 8 and part of the radial load along the radial direction of the rotating shaft 8, wherein the first tapered roller bearing and the second tapered roller bearing 30 cooperate to bear the axial force of the rotating shaft 8. The second tapered roller bearing 30 is axially limited by the end cover 9, but not limited thereto. By adjusting the position of the end cover 9, the preload force of the second tapered roller bearing 30 can also be adjusted, but not limited thereto.
[0058] In another aspect of the present disclosure, a wind turbine generator set is provided, wherein the wind turbine generator set comprises the shaft system as described above.
[0059] The bearing assembly provided by the present disclosure includes a first bearing 10 and a second bearing 20 that are adjacently arranged to form a combined bearing, which improves the load-bearing capacity of the shaft system, but because there is no need to increase the size of a single bearing, the manufacturing cost of the bearing assembly is reduced.
[0060] The first bearing 10 includes a tapered roller bearing, which mainly bears the axial thrust load along the rotating shaft 8 and part of the radial load along the radial direction of the rotating shaft 8. The second bearing 20 includes a cylindrical roller bearing, which mainly bears the radial load along the radial direction of the rotating shaft 8. The first bearing 10 and the second bearing 20 are adjacently arranged along the axial direction of the rotating shaft 8. In this way, the combination of the first bearing 10 and the second bearing 20 improves the ability of the shaft system to resist various loads.
[0061] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.
[0062] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.
[0063] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0064] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.
Claims
1. A bearing assembly, characterized in that: Applicable to a wind turbine generator set, the bearing assembly comprises: The bearing seat (40) is provided with a rotating shaft mounting hole for the rotating shaft (8) to pass through; A first bearing (10) and a second bearing (20), wherein the first bearing (10) and the second bearing (20) are arranged between the rotating shaft (8) and the bearing seat (40), and the first bearing (10) and the second bearing (20) are arranged adjacent to each other along the axial direction of the rotating shaft (8), the first bearing (10) can bear radial loads and axial loads, and the second bearing (20) can bear radial loads.
2. The bearing assembly according to claim 1, characterized in that The rotating shaft (8) is the main shaft of the wind turbine generator set, and the wind turbine generator set also includes a wheel hub and a generator. The first end of the main shaft is connected to the wheel hub, and the second end of the main shaft is connected to the rotor of the generator. The first bearing (10) and the second bearing (20) are located at the first end of the main shaft, and the first bearing (10) is arranged close to the wheel hub relative to the second bearing (20).
3. The bearing assembly according to claim 2, characterized in that The first bearing (10) comprises a first tapered roller bearing or a thrust ball bearing, and the second bearing (20) comprises a cylindrical roller bearing or a radial ball bearing.
4. The bearing assembly according to claim 2, wherein: The inner diameter of the first bearing (10) is greater than the inner diameter of the second bearing (20), and the rotating shaft (8) is formed as a stepped shaft to match the first bearing (10) and the second bearing (20) respectively.
5. The bearing assembly according to claim 4, characterized in that The stepped shaft comprises a first shaft shoulder (81) and a second shaft shoulder (82) which are arranged at intervals along the axial direction of the rotating shaft (8); the first shaft shoulder (81) is arranged close to the wheel hub relative to the second shaft shoulder (82); the radius of the first shaft shoulder (81) is greater than the radius of the second shaft shoulder (82); a third shaft shoulder (41) and a fourth shaft shoulder (42) which are arranged at intervals along the axial direction of the rotating shaft (8) are arranged in the rotating shaft mounting hole of the bearing seat (40); the third shaft shoulder (41) is arranged close to the wheel hub relative to the fourth shaft shoulder (42); the radius of the third shaft shoulder (41) is greater than the radius of the fourth shaft shoulder (42); The first shaft shoulder (81) is arranged on a side of the first bearing (10) facing the wheel hub, and the first inner ring (2) of the first bearing (10) abuts against the first shaft shoulder (81); the third shaft shoulder (41) is arranged on a side of the first bearing (10) facing away from the wheel hub, and the first outer ring (1) of the first bearing (10) abuts against the third shaft shoulder (41); The second shaft shoulder (82) is arranged on the side of the second bearing (20) facing the first bearing (10), the second inner ring (4) of the second bearing (20) abuts against the second shaft shoulder (82), the fourth shaft shoulder (42) is arranged on the side of the second bearing (20) facing away from the first bearing (10), and the second outer ring (3) of the second bearing (20) abuts against the fourth shaft shoulder (42).
6. The bearing assembly according to claim 5, characterized in that The bearing assembly comprises a first spacer ring (5) and a second spacer ring (6), wherein the first spacer ring (5) is sleeved on the rotating shaft (8) and is located between the second shaft shoulder (82) and the second inner ring (4) along the axial direction of the rotating shaft (8), and the first spacer ring (5) does not protrude from the second shaft shoulder (82) along the radial direction of the rotating shaft (8), and the second spacer ring (6) is sleeved on the rotating shaft (8) and abuts against a side of the second inner ring (4) away from the wheel hub.
7. The bearing assembly according to claim 6, characterized in that The bearing assembly also includes a third spacer ring (7), which is spaced apart radially outside the first spacer ring (5), and the axial ends of the third spacer ring (7) respectively abut between the first outer ring (1) of the first bearing (10) and the second outer ring (3) of the second bearing (20).
8. The bearing assembly according to claim 7, wherein: The inner diameter of the third spacer ring (7) is not less than the inner diameter of the first outer ring (1) and the inner diameter of the second outer ring (3).
9. The bearing assembly according to claim 3, wherein: The bearing assembly further comprises a second tapered roller bearing (30) arranged at the second end of the main shaft, and the first tapered roller bearing and the second tapered roller bearing (30) are arranged face to face or back to back.
10. A shaft system, characterized in that: The shaft system includes a rotating shaft (8) and a bearing assembly according to any one of claims 1 to 9, wherein the rotating shaft (8) is rotatably arranged in the rotating shaft mounting hole, and the first bearing (10) and the second bearing (20) are respectively arranged between the rotating shaft (8) and the bearing seat (40).
11. A wind turbine generator set, characterized in that: The wind turbine generator set comprises the shaft system according to claim 10.