Bearing assembly, gearbox and wind turbine generator system
By setting an elastic member between the inner and outer rings of the bearing, the relative rotating components in the wind turbine gearbox are flexibly supported, solving the problem of uncompensated local loads in the wind turbine gearbox, extending bearing life and reducing noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-23
AI Technical Summary
In wind turbine gearboxes, local loads caused by parasitic loads cannot be compensated in a timely manner, leading to premature damage to planetary carrier bearings and increased noise.
An elastic member, including first and second elastic members, is provided between the inner and outer rings of the bearing to flexibly support the relative rotation of the member and absorb or compensate for local loads in the radial direction.
This extends the service life of the bearings, prevents premature failure, reduces the noise of the wind turbine gearbox, and improves the stability of the system.
Smart Images
Figure CN224396623U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind turbine generators, specifically to a bearing assembly, a gearbox including the bearing assembly, and a wind turbine generator set. Background Technology
[0002] A wind turbine generator set typically includes a wind turbine gearbox, a main shaft system connected to the wind turbine gearbox, and a generator connected to the wind turbine gearbox and driven by the wind turbine gearbox to generate electricity.
[0003] Wind turbine gearboxes contain at least one stage of planetary gear train to transmit torque from the main shaft system. During this process, the gearbox must also withstand parasitic loads, such as localized loads caused by rotor torque or transmission system deformation, and relative displacement between the first-stage sun gear and ring gear due to the reaction force generated by the torque arm. Deviations caused by these relative displacements need to be compensated for promptly; failure to do so will result in localized loads. Utility Model Content
[0004] To address the aforementioned problems, this invention provides a flexible bearing assembly to absorb or compensate for localized loads in the radial direction.
[0005] According to one aspect of the present invention, a bearing assembly is provided for mounting between a first member and a second member that rotate relative to each other. The bearing assembly includes: an inner bearing ring for engaging with the first member; an outer bearing ring rotatable relative to the inner bearing ring and for engaging with the second member; and an elastic member including at least one of a first elastic member and a second elastic member. The first elastic member is locating between the radially outer surface of the outer bearing ring and the second member, and the second elastic member is locating between the radially inner surface of the inner bearing ring and the first member.
[0006] The first elastic member is disposed on at least a portion of the radial outer surface of the outer ring of the bearing, and / or the second elastic member is disposed on at least a portion of the radial inner surface of the inner ring of the bearing.
[0007] The first elastic member is arranged along the circumferential direction of the outer ring of the bearing, and / or the second elastic member is arranged along the circumferential direction of the inner ring of the bearing.
[0008] The first elastic member covers the entire radial outer surface of the bearing outer ring, and / or the second elastic member covers the entire radial inner surface of the bearing inner ring.
[0009] At least one of the first elastic member and the second elastic member includes two or more annular members spaced apart along the axial direction of the bearing assembly.
[0010] At least one of the first elastic member and the second elastic member includes a hollowed-out pattern disposed on the radial outer surface of the bearing outer ring and / or disposed on the radial inner surface of the bearing inner ring; or at least one of the first elastic member and the second elastic member includes a plurality of strip-shaped elastic structures disposed on the radial outer surface of the bearing outer ring and / or the radial inner surface of the bearing inner ring.
[0011] The elastic component is a rubber component.
[0012] At least one surface of the first elastic member and the second elastic member has a protruding structure.
[0013] The bearing assembly further includes a raceway disposed between the inner ring and the outer ring of the bearing, and rolling elements located in the raceway, wherein the raceway is inclined relative to the central axis of the bearing.
[0014] According to another aspect of the present invention, a gearbox is provided, the gearbox including the bearing assembly as described above, and a first member and a second member that rotate relative to each other, wherein the inner ring of the bearing engages with the first member, and the outer ring of the bearing engages with the second member.
[0015] The first component is a planetary carrier, and the second component is a housing.
[0016] The gearbox includes a first-stage planetary gear system and a second-stage planetary gear system, with the planet carrier disposed within the planetary gear system.
[0017] According to another aspect of the present invention, a wind turbine generator set is provided, the wind turbine generator set including the gearbox as described above.
[0018] According to an embodiment of the present invention, a bearing assembly is provided that can absorb or compensate for local loads in the radial direction, thereby extending the bearing's service life and preventing premature failure.
[0019] According to embodiments of the present invention, a wind turbine gearbox can be provided to prevent the planetary carrier bearing from being affected by radial parasitic forces and to reduce noise in the wind turbine gearbox. Attached Figure Description
[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:
[0021] Figure 1 This is a partial cross-sectional view of the bearing assembly according to the first embodiment of the present invention;
[0022] Figure 2 This is a partial cross-sectional view of the bearing assembly according to the second embodiment of the present invention;
[0023] Figure 3 This is a partial cross-sectional view of the bearing assembly according to the third embodiment of the present invention;
[0024] Figure 4 This is a partial cross-sectional view of the bearing assembly according to the fourth embodiment of the present invention.
[0025] Tag name:
[0026] 10-Bearing inner ring, 100-First component, 20-Bearing outer ring, 200-Second component, 30-Rolling element, 40-Elastic component, 41-First elastic component, 42-Second elastic component, 43-Third elastic component. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0029] Wind turbine gearboxes typically contain at least one stage of planetary gear train, each stage comprising a sun gear, planet gears, and a ring gear. The first stage planetary gear train is positioned close to the rotor side (i.e., the rotor side of the wind turbine generator), and the second stage planetary gear train is positioned adjacent to it (this is not an limitation; multiple stages of planetary gear trains are possible). Parasitic loads on the wind turbine gearbox act on the first stage planetary gear train. Although calibration structures are usually provided, these structures cannot always effectively compensate for or absorb deviations caused by corresponding localized loads. Therefore, the parasitic loads acting on the first stage planetary gear train will cause localized loads on the planet carrier bearings of the second stage planetary gear train connected to the first stage.
[0030] To avoid this problem, a method of setting radial clearance in planetary carrier bearings is adopted, for example, setting radial clearance between the rolling elements and the outer ring of the bearing, or using radial clearance between the outer ring of the bearing and the bearing housing.
[0031] However, radial clearance in a bearing can lead to unfavorable load conditions in the contact area between the rolling elements and the raceway. For example, the load distribution on the contact surface of the rolling elements may be uneven, and continuous motion will generate more energy on the load contact surface, thus increasing the risk of premature bearing failure. Furthermore, excessive radial clearance can cause parasitic interference in the gearbox system, such as noise from the gearbox during wind turbine startup or accidental contact between the oil supply ring and the planetary carrier.
[0032] To address the aforementioned problems, embodiments of this invention provide a bearing assembly that can be installed between a first component and a second component that rotate relative to each other. For example, it can be installed in the gearbox of a wind turbine generator to support a planet carrier (e.g., the planet carrier of a second-stage planetary gear train) within the gearbox. In this case, the first component may correspond to the planet carrier, and the second component may correspond to the gearbox housing. This will be described in detail below using this example; however, the bearing assembly of this invention is not limited to this application but can also be applied to other similar environments.
[0033] like Figure 1 and Figure 2 As shown, the bearing assembly according to this utility model may include an inner bearing ring 10, an outer bearing ring 20, and an elastic member 40. The inner bearing ring 10 is used to engage with the first member 100, the outer bearing ring 20 is rotatable relative to the inner bearing ring 10 and is used to engage with the second member 200, and the elastic member 40 may include at least one of a first elastic member 41 and a second elastic member 42, the first elastic member 41 being located between the radially outer surface of the outer bearing ring 20 and the second member 200, and the second elastic member 42 being located between the radially inner surface of the inner bearing ring 10 and the first member 100.
[0034] In addition, a raceway is provided between the inner ring 10 and the outer ring 20 of the bearing, and the rolling element 30 is disposed in the raceway so that the inner ring 10 and the outer ring 20 of the bearing can rotate relative to each other.
[0035] According to an embodiment of this utility model, by providing an elastic member 40 on the outer side of the bearing outer ring 20 and / or the inner side of the bearing inner ring 10, the first member 100 connected to the bearing assembly can be flexibly supported, thereby reducing radial stiffness. In other words, by providing the elastic member 40 on the outer side of the bearing outer ring 20 and / or the inner side of the bearing inner ring 10, both the radial clearance with the bearing housing and the prevention of uneven load distribution and noise on the contact surface of the rolling elements 30 can be maintained.
[0036] Figures 1 to 4 Various embodiments of the bearing assembly according to the present invention are shown, and the accompanying drawings show only a cross-sectional view of a portion of the bearing assembly.
[0037] Figure 1 A first embodiment according to the present invention is shown. For example... Figure 1 As shown, the elastic member 40 may consist only of a first elastic member 41 disposed between the radially outer surface of the bearing outer ring 20 and the second member 200. In this case, the first elastic member 41 may be engaged with the radially outer surface of the bearing outer ring 20 or with the inner wall surface of the second member 200 (e.g., the inner surface of the bearing housing), as long as the first elastic member 41 can fill the clearance between the bearing outer ring 20 and the second member 200 (e.g., ...). Figure 1 The distance C between the two shown is sufficient, in which case the first elastic member 41 can act as a flexible support.
[0038] Figure 2 A second embodiment according to the present invention is shown. For example... Figure 2 As shown, the elastic member 40 may also include only a second elastic member 42 disposed between the bearing inner ring 10 and the first member 100. The second elastic member 42 may be engaged with the radial inner surface of the bearing inner ring 10 or with the surface of the first member 100 facing the bearing inner ring 10, thereby filling the clearance between the bearing inner ring 10 and the first member 100 to provide flexible support.
[0039] Figure 3 A third embodiment according to the present invention is shown. (As shown) Figure 3 As shown, the elastic member 40 may include both a first elastic member 41 and a second elastic member 42. The arrangement of the first elastic member 41 and the second elastic member 42 may be the same as in the first embodiment and the second embodiment, respectively, so a detailed description thereof is omitted.
[0040] Figure 4 A fourth embodiment according to the present invention is shown. (As shown) Figure 4 As shown, the elastic member 40 may include a third elastic member 43 disposed between the radial outer surface of the bearing outer ring 20 and the second member 200. Compared with the first embodiment, the shape of the third elastic member 43 is different from that of the first elastic member 41. As will be described below, the first elastic member 41 may include two or more annular members, and the third elastic member 43 may have a shape that covers the entire radial outer surface of the bearing outer ring 20 or covers the entire radial outer surface of the bearing outer ring 20 with a hollowed-out pattern. In addition, other arrangements may be the same as the first elastic member 41, so descriptions that are repeated with the first elastic member 41 are omitted.
[0041] In addition, although Figures 1 to 3The first elastic member 41 and the second elastic member 42 are shown to have the same shape and position, but the present invention is not limited thereto. The shape of the elastic member 40 will be further described below. The first elastic member 41 and the second elastic member 42 may have any of the same shapes described or may have two different shapes.
[0042] In the following text, the first elastic member 41, the second elastic member 42, and the third elastic member 43 will be collectively referred to as elastic member 40, and will be further referred to as elastic member 40. Figure 1 The following is an example of an embodiment (the elastic member is only provided between the outer ring 20 of the bearing and the second member 200).
[0043] According to an embodiment of the present invention, the elastic member 40 can at least partially cover the entire radial outer surface of the bearing outer ring 20, that is, the elastic member 40 can be disposed on the entire radial outer surface of the bearing outer ring 20 (e.g., Figure 4 (As shown in the fourth embodiment), it may also cover only a portion of the radial outer surface of the bearing outer ring 20.
[0044] For example, the elastic member 40 can be arranged along the circumferential direction of the bearing outer ring 20. Preferably, the elastic member 40 can be evenly arranged along the circumferential direction of the bearing outer ring 20 to achieve more balanced flexible support.
[0045] According to an embodiment of the present invention, the elastic member 40 may include two or more annular members arranged at predetermined intervals along the axial direction of the bearing assembly. For example... Figure 1 As shown, each of the two or more annular members may have an O-shaped cross-section, but is not limited thereto; each annular member may also have any other cross-sectional shape. In this case, the two or more annular members may be arranged at equal intervals along the axial direction of the bearing outer ring 20, thereby providing uniform support in both the radial and axial directions.
[0046] However, this invention is not limited to this. Although not shown, the elastic member 40 may cover the radial outer surface of the bearing outer ring 20 in the form of a predetermined perforated pattern. Alternatively, the elastic member 40 may include a plurality of strip-shaped elastic structures spaced apart from each other. For example, the plurality of strip-shaped elastic structures may have the same shape and be arranged in the same direction, for example, extending in a direction parallel to the central axis of the bearing and spaced apart at a certain distance in the circumferential direction. However, it is not limited to this; the plurality of strip-shaped structures may also be arranged in an inclined direction and spaced apart at a certain distance in the circumferential direction. The specific pattern of the perforated pattern is not limited, and the plurality of strip-shaped elastic structures may also have different shapes from each other, as long as they can be arranged between the bearing outer ring 20 and the second member 200.
[0047] According to an embodiment of the present invention, the elastic member 40 can be bonded to the radial outer surface of the bearing outer ring 20 by adhesive or by its own elasticity. For example, when the elastic member 40 is an integral structure (e.g., covering the entire radial outer surface of the bearing outer ring 20 or including a hollow pattern) or is... Figure 1 When the ring-shaped structure is shown, the elastic member 40 can be detachably fitted onto the outer surface of the bearing outer ring 20 using its own elasticity; when the elastic member 40 includes multiple strip structures, the multiple strip structures can be respectively bonded to the outer surface of the bearing outer ring 20. This utility model does not have any special restrictions on the combination form of the elastic member 40, as long as it can fill the above-mentioned clearance and support the bearing in the radial direction.
[0048] However, when the elastic member 40 is bonded to the inner surface of the second member 200, it may not be possible to use the elastic force of the elastic member 40 itself to bond it to the second member 200. In this case, the elastic member 40 can be fixed to the second member 200 by adhesive bonding.
[0049] According to another embodiment of the present invention, although not shown in the drawings, at least one surface of the elastic member 40 has a protrusion structure relative to the corresponding surface. For example, when one surface (e.g., the inner surface) of the elastic member 40 is fixed to the radial outer surface of the bearing outer ring 20, the other surface (e.g., the outer surface) of the elastic member 40 may have multiple protrusion structures. In this case, the thickness of the portion of the elastic member 40 other than the protrusion structures may be thinner than the thickness of the elastic member in the above embodiment, thereby ensuring both the bonding strength between the elastic member 40 and the bearing outer ring 20 and absorbing or compensating for local loads in the radial direction. However, the present invention is not limited thereto. When the other surface of the elastic member 40 is fixed to the second member 200, multiple protrusion structures may be formed on the surface of the elastic member 40 facing the bearing outer ring 20; alternatively, the protrusion structures may also be provided on both surfaces of the elastic member 40.
[0050] According to this invention, the raceway located between the inner ring 10 and the outer ring 20 of the bearing can be inclined relative to the central axis of the bearing, so that the rolling elements 30 located in the raceway are also inclined relative to the central axis of the bearing. According to an embodiment of this invention, such as... Figures 1 to 4 As shown, the bearing can be a tapered roller bearing to provide high load capacity and good support stiffness.
[0051] Although Figures 1 to 4The illustration shows the rolling element 30 as having a cylindrical shape (rectangular cross-section), but in practice, the rolling element 30 can also be a truncated conical shape (trapezoidal cross-section). However, this invention is not limited to this; the bearing can also be a cylindrical roller bearing, in which case the rolling element can have a cylindrical shape (rectangular cross-section). Furthermore, this invention is not limited to... Figures 1 to 4 As shown, the bearing inner ring 10 and bearing outer ring 20 may also include symmetrically arranged double-row raceways to be able to withstand high radial loads and bidirectional axial loads simultaneously.
[0052] According to another aspect of the present invention, a wind turbine gearbox is provided, the wind turbine gearbox including a housing (only a partial structure of the housing is shown in the figure, corresponding to the first component 100) and a planetary carrier disposed in the housing, wherein a bearing assembly according to an embodiment of the present invention is disposed between the planetary carrier and the housing, such that the outer ring 20 of the bearing assembly is connected to the housing.
[0053] The wind turbine gearbox may include a first-stage planetary gear train and a second-stage planetary gear train. The bearing assembly including the elastic member 40 can be used to support the planet carrier of the second-stage planetary gear train (corresponding to the second member 200), thereby flexibly supporting the planet carrier in the radial direction and preventing local loads.
[0054] Furthermore, as described above, when the bearing assembly of this invention is installed between the housing and the planetary carrier, the thickness of the elastic member 40 can be substantially the same as the gap between the housing and the outer ring 20 of the bearing (i.e., the clearance as described above), thereby providing flexible support between the housing and the outer ring 20 of the bearing.
[0055] According to an embodiment of the present invention, a bearing assembly is provided that can absorb or compensate for local loads in the radial direction, thereby extending the bearing's service life and preventing premature failure.
[0056] According to embodiments of the present invention, a wind turbine gearbox can be provided to prevent the planetary carrier bearing from being affected by radial parasitic forces and to reduce noise in the wind turbine gearbox.
[0057] According to one aspect of the present invention, a wind turbine generator set is provided, which may include the aforementioned wind turbine gearbox.
[0058] Although exemplary embodiments of the present invention have been specifically described with reference to exemplary embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made thereto without departing from the spirit and scope of the present invention as defined by the claims.
Claims
1. A bearing assembly for mounting between a first member (100) and a second member (200) that rotate relative to each other, characterized in that, The bearing assembly includes: The bearing inner ring (10) is used to engage with the first member (100); The bearing outer ring (20) is rotatable relative to the bearing inner ring (10) and is used to engage with the second member (200); and The elastic member (40) includes at least one of a first elastic member (41) and a second elastic member (42). The first elastic member (41) can be located between the radial outer surface of the bearing outer ring (20) and the second member (200), and the second elastic member (42) can be located between the radial inner surface of the bearing inner ring (10) and the first member (100).
2. The bearing assembly of claim 1, wherein, The first elastic member (41) is disposed on at least a portion of the radial outer surface of the bearing outer ring (20), and / or the second elastic member (42) is disposed on at least a portion of the radial inner surface of the bearing inner ring (10).
3. The bearing assembly according to claim 2, characterized in that, The first elastic member (41) is arranged along the circumferential direction of the outer ring (20) of the bearing, and / or the second elastic member (42) is arranged along the circumferential direction of the inner ring (10) of the bearing.
4. The bearing assembly according to claim 3, characterized in that, The first elastic member (41) covers the entire radial outer surface of the bearing outer ring (20), and / or the second elastic member (42) covers the entire radial inner surface of the bearing inner ring (10).
5. The bearing assembly according to claim 3, characterized in that, At least one of the first elastic member (41) and the second elastic member (42) includes two or more annular members spaced apart along the axial direction of the bearing assembly.
6. The bearing assembly according to claim 2, characterized in that, At least one of the first elastic member (41) and the second elastic member (42) includes a hollowed-out pattern disposed on the radial outer surface of the bearing outer ring (20) and / or disposed on the radial inner surface of the bearing inner ring (10); or At least one of the first elastic member (41) and the second elastic member (42) includes a plurality of strip-shaped elastic structures disposed on the radial outer surface of the bearing outer ring (20) and / or the radial inner surface of the bearing inner ring (10).
7. The bearing assembly according to any one of claims 1-6, characterized in that, The elastic member (40) is a rubber member.
8. The bearing assembly according to any one of claims 2-6, characterized in that, At least one surface of the first elastic member (41) and the second elastic member (42) has a protruding structure.
9. The bearing assembly according to claim 1, characterized in that, The bearing assembly further includes a raceway disposed between the inner ring (10) and the outer ring (20) of the bearing, and rolling elements (30) located in the raceway. The raceway is inclined relative to the central axis of the bearing.
10. A gearbox, characterized in that, The gearbox includes a bearing assembly as described in any one of claims 1 to 9, and a first member (100) and a second member (200) that rotate relative to each other, wherein the inner ring (10) of the bearing engages with the first member (100) and the outer ring (20) of the bearing engages with the second member (200).
11. The gearbox according to claim 10, characterized in that, The first component (100) is a planetary carrier, and the second component (200) is a housing.
12. The gearbox according to claim 11, characterized in that, The gearbox includes a first-stage planetary gear system and a second-stage planetary gear system, with the planet carrier disposed within the planetary gear system.
13. A wind turbine generator set, characterized in that, The wind turbine generator set includes a gearbox as described in any one of claims 10 to 12.