Wind turbine generator and bearing thereof
The innovative bearing design with controlled oil flow paths addresses the issue of uncontrolled oil distribution in wind turbine bearings, enhancing lubrication and reducing maintenance needs.
Patent Information
- Application Number
- CN202422386292.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, the injection and discharge paths of grease in the bearing are uncontrollable, resulting in the formation of dead corners of grease, and the new and old grease cannot flow in sequence, resulting in poor bearing lubrication and poor sealing effect, and the grease is prone to leak, which increases bearing wear and maintenance costs.
Design a bearing structure, including the outer ring, the inner ring and the sealing ring, and set up multiple lubricating structures. The grease injection hole and the grease removal hole are distributed in the circumferential and axial directions of the bearing. The grease injection hole is located between the grease removal holes, and the diameter of the grease removal hole is greater than the grease injection holes to ensure smooth flow of grease and pressure relief of the sealing ring.
It achieves smooth injection and discharge of grease, reduces dead corners of grease, improves sealing effect, ensures sufficient lubrication of bearings, and reduces wear and maintenance costs.
Smart Images
Figure CN223105065U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearing lubrication, and particularly relates to a bearing. Background Art
[0002] In a wind turbine generator set, the pitch bearing is located at the blade root, with harsh operating conditions, complex bearing forces, and very difficult maintenance. Severe bearing wear will lead to the replacement of the bearing and the blade going down the tower, causing huge quality losses. In the current oil circuit design of the pitch bearing, regardless of whether the pitch bearing teeth are internally meshed or externally meshed, the bearing lubrication adopts the form of radially injecting from one row of bearing raceways and radially discharging from the other row of bearing raceways.
[0003] In fact, since the grease injection hole is relatively close to the sealing ring at the grease injection end, the sealing ring bears a large grease injection pressure, which easily causes leakage of the newly injected grease. Moreover, the grease injection hole is relatively far from the other row of rollers, resulting in a large grease injection resistance and making it difficult for the new grease to reach.
[0004] Therefore, in the current oil circuit design, it is very difficult for the grease to be injected and discharged according to the original preset path, that is, the path of the grease injection and discharge process is uncontrollable, dead corners will form at some positions, the old and new grease cannot flow in sequence, resulting in local grease calcification, insufficient grease at some positions, poor bearing lubrication, and the metal particles and grains generated during the bearing operation cannot be discharged with the old grease, causing bearing pitting, spalling, wear and rapid deterioration. And the sealing ring bears a large grease injection pressure and the pressure brought by the bearing operation, making it very difficult to achieve good sealing, unable to truly play a sealing role, easy grease leakage, difficult bearing cleaning, high cleaning cost, and potential risks to environmental protection. Similar situations also exist in other slewing bearings such as yaw bearings. Summary of the Utility Model
[0005] Aiming at the above problems existing in the prior art, the technical problem to be solved by the utility model is that in the current oil circuit design, it is very difficult for the grease to be injected and discharged according to the original preset path, that is, the path of the grease injection and discharge process is uncontrollable, dead corners will form at some positions, the old and new grease cannot flow in sequence, resulting in local grease calcification, insufficient grease at some positions, and poor bearing lubrication.
[0006] To solve the above technical problems, the utility model adopts the following technical scheme: A bearing, comprising: an outer ring, an inner ring and a sealing ring;
[0007] The outer ring is coaxially sleeved on the inner ring, and a gap is provided between the inner side wall of the outer ring and the outer side wall of the inner ring. The two sealing rings are respectively arranged at both ends of the gap to seal the gap;
[0008] A plurality of lubrication structures are provided in the circumferential direction of the bearing. Each lubrication structure includes a grease injection hole and two grease discharge holes that communicate with the gap. The grease injection hole is formed in one of the outer ring and the inner ring, and the grease discharge holes are formed in one of the outer ring and the inner ring. In the axial direction of the bearing, the grease injection hole is located between the two grease discharge holes.
[0009] Preferably, the plurality of lubrication structures are evenly distributed in the circumferential direction of the bearing.
[0010] Preferably, the grease injection hole and the grease discharge holes are arranged in the radial direction of the bearing.
[0011] Preferably, the diameter of the grease discharge holes is larger than the diameter of the grease injection hole.
[0012] Preferably, the two grease discharge holes in each group of lubrication structures are symmetrically arranged on both sides of the grease injection hole in the axial direction of the bearing.
[0013] Preferably, the grease injection hole is arranged in the middle of the bearing in the axial direction.
[0014] Preferably, the grease injection hole and the grease discharge holes in each group of lubrication structures are in the same position in the circumferential direction of the bearing.
[0015] Preferably, the grease injection hole and the grease discharge holes in each group of lubrication structures are staggered in the circumferential direction of the bearing.
[0016] A wind turbine includes the bearing described in any one of the above.
[0017] Compared with the prior art, the present utility model has at least the following advantages:
[0018] 1. In the present utility model, lubricating grease is injected through the grease injection hole into the gap between the inner side wall of the outer ring and the outer side wall of the inner ring. After the grease enters the gap, it lubricates the bearing rollers and raceways and moves towards the grease discharge holes. During the continuous grease injection process, the old grease flows to the grease discharge holes in sequence under the pressure of the new grease, which can basically eliminate the grease dead corners and avoid grease calcification and local poor lubrication of the bearing.
[0019] 2. In the present utility model, the grease discharge holes are arranged on both sides of the grease injection hole in the axial direction, so that the two grease discharge holes are close to the seals on both sides of the gap, which plays a role in relieving the pressure on the seals. Such an arrangement of the grease discharge holes will reduce the pressure borne by the seals, greatly improve the sealing effect, and is also conducive to the discharge of the old grease.
[0020] 3. In the present utility model, the design that the diameter of the grease discharge hole is larger than that of the grease injection hole enables a large pressure difference to be formed between the grease injection hole and the grease discharge hole, so that it can ensure that the grease flows from the grease injection hole with a higher pressure to the grease discharge hole with a lower pressure, and the grease injection and discharge of the bearing are more sufficient and smooth.
[0021] 4. In the present utility model, the pressures at the two rows of grease discharge holes are basically the same. The grease injection hole and the grease discharge hole make the path of the lubricating grease controllable during grease injection and discharge. The old grease and the new grease flow in sequence, reducing the dead corners of the grease, making it not easy for the grease to calcify, and making the bearing lubrication more sufficient. And because the grease flow path is controllable and the grease flows in sequence, the metal particles generated during the operation of the bearing can be carried out by the old grease, reducing the bearing wear. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the specific embodiments of the present utility model, the drawings required for the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
[0023] Figure 1 It is a schematic structural diagram of a bearing provided by an embodiment in the present utility model.
[0024] Reference numerals: 1 - outer ring, 2 - inner ring, 3 - sealing ring, 4 - gap, 5 - grease injection hole, 6 - grease discharge hole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] The embodiments of the technical solutions of the present utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model.
[0026] In the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.
[0027] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0028] Here, a pitch bearing with internal teeth is taken as an example for illustration. Refer to Figure 1 , an embodiment provided by the present utility model: a bearing, comprising: an outer ring 1, an inner ring 2, and a sealing ring 3; the outer ring 1 is coaxially sleeved on the inner ring 2, and a gap 4 is provided between the inner side wall of the outer ring 1 and the outer side wall of the inner ring 2. Two sealing rings 3 are respectively arranged at both ends of the gap 4 to seal the gap 4; a plurality of lubrication structures are provided in the circumferential direction of the bearing. The lubrication structure includes a grease injection hole 5 and two grease discharge holes 6 communicated with the gap 4; the grease injection hole 5 is opened on one of the outer ring 1 and the inner ring 2; the grease discharge hole 6 is opened on one of the outer ring 1 and the inner ring 2; and in the axial direction of the bearing, the grease injection hole 5 is located between the two grease discharge holes 6.
[0029] Lubricating grease is injected into the gap 4 between the inner side wall of the outer ring 1 and the outer side wall of the inner ring 2 through the grease injection hole 5. After the grease enters the gap 4, it lubricates the bearing rollers and raceways and moves towards the grease discharge holes 6; during the continuous grease injection process, the old grease flows sequentially to the grease discharge holes 6 under the pressure of the new grease, which can basically eliminate the grease dead corners, avoid grease calcification and local poor lubrication of the bearing; at the same time, the grease discharge holes 6 are arranged on both sides of the grease injection hole 5 in the axial direction, so that the two grease discharge holes 6 are close to the sealing rings 3 on both sides of the gap 4, playing a role of relieving pressure on the sealing rings 3. Such an arrangement of the grease discharge holes 6 will reduce the pressure borne by the sealing rings 3, greatly improve the sealing effect, and is also conducive to the discharge of the old grease.
[0030] Specifically, if the bearing uses internal teeth, its grease injection hole 5 and grease discharge holes 6 are arranged on the outer ring 1 of the bearing; if the bearing uses external teeth, the grease injection hole 5 and grease discharge holes 6 are arranged on the inner ring 2 of the bearing; this structure is also applicable to other slewing bearings, such as yaw bearings, etc. The positions of the grease injection hole 5 and grease discharge holes 6 are adaptively set according to the specific product structure and spatial layout.
[0031] Refer to Figure 1 , in other embodiments, multiple groups of lubrication structures are evenly distributed in the circumferential direction of the bearing; thus, uniform grease injection and pressure relief can be achieved in the circumferential direction through the grease injection hole 5 and grease discharge holes 6; it can also adopt a basically evenly distributed form in combination with the specific product structure and spatial layout.
[0032] Refer toFigure 1 , in other embodiments, the grease injection holes 5 and the grease discharge holes 6 are arranged in the radial direction of the bearing; the extension lines of the plurality of grease injection holes 5 and the grease discharge holes 6 intersect at the axis of the bearing, facilitating the machining of the grease injection holes 5 and the grease discharge holes 6.
[0033] See Figure 1 , in other embodiments, the diameter of the grease discharge hole 6 is larger than the diameter of the grease injection hole 5; such that a large pressure difference is formed between the grease injection hole 5 and the grease discharge hole 6, so as to ensure that the grease flows from the grease injection hole 5 with a higher pressure to the grease discharge hole 6 with a lower pressure, and the grease injection and discharge of the bearing are more sufficient and smooth.
[0034] See Figure 1 , in other embodiments, the two grease discharge holes 6 in each group of lubrication structures are symmetrically arranged on both sides of the grease injection hole 5 in the axial direction of the bearing; such that the pressures at the two rows of grease discharge holes 6 are basically the same, and the grease injection hole 5 and the grease discharge holes 6 make the path of the lubricating grease controllable during grease injection and discharge, the old grease and the new grease flow in sequence, reducing grease dead corners, and the grease is not easily calcified, and the bearing lubrication is more sufficient; and because the grease flow path is controllable and the grease flows in sequence, the metal particles generated during the operation of the bearing can be carried out by the old grease, reducing bearing wear. Further, the grease injection hole 5 is arranged in the middle of the bearing in the axial direction; such that the distances between the grease injection hole 5 and the two sealing rings 3 are the same, and the distances between the two rows of grease discharge holes 6 and the corresponding sealing rings 3 are the same, so that when grease injection and discharge are performed, the pressures received by the two sealing rings 3 are basically the same.
[0035] See Figure 1 , in yet another embodiment, the grease injection holes 5 and the grease discharge holes 6 in each group of lubrication structures are in the same position in the circumferential direction of the bearing; such that the grease injection holes 5 and the grease discharge holes 6 in each group of lubrication structures are in the same cross-sectional plane, and the cross-sectional plane is located on the axis of the bearing; further, the grease injection holes 5 and the grease discharge holes 6 in each group of lubrication structures can also be staggered in the circumferential direction of the bearing; the positions between the grease injection holes 5 and the grease discharge holes 6 in each group of lubrication structures are determined according to the specific product structure and space layout.
[0036] Yet another embodiment provided by the present utility model: a wind turbine, including the bearing described in any of the above embodiments.
[0037] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model, and they should all be covered by the scope of the claims and the description of the present utility model.
Claims
1. A bearing, characterized in that, Comprising: An outer ring, an inner ring and a sealing ring; The outer ring is coaxially sleeved on the inner ring, and there is a gap between the inner side wall of the outer ring and the outer side wall of the inner ring. Two sealing rings are respectively arranged at both ends of the gap to seal the gap; A plurality of groups of lubricating structures are arranged in the circumferential direction of the bearing. The lubricating structure includes a grease injection hole and two grease discharge holes communicated with the gap; the grease injection hole is opened on one of the outer ring and the inner ring; the grease discharge hole is opened on one of the outer ring and the inner ring; and in the axial direction of the bearing, the grease injection hole is located between the two grease discharge holes.
2. The bearing according to claim 1, characterized in that, The plurality of groups of lubricating structures are evenly distributed in the circumferential direction of the bearing.
3. The bearing according to claim 1, characterized in that, The grease injection hole and the grease discharge hole are arranged in the radial direction of the bearing.
4. The bearing according to claim 1, characterized in that, The diameter of the grease discharge hole is larger than the diameter of the grease injection hole.
5. The bearing according to claim 1, characterized in that, The two grease discharge holes in each group of lubricating structures are symmetrically arranged on both sides of the grease injection hole in the axial direction of the bearing.
6. The bearing according to claim 5, characterized in that, The grease injection hole is arranged in the middle of the bearing in the axial direction.
7. The bearing according to claim 1, characterized in that, The positions of the grease injection hole and the grease discharge hole in each group of lubricating structures are the same in the circumferential direction of the bearing.
8. The bearing according to claim 1, characterized in that The grease injection hole and the grease discharge hole in each group of lubricating structures are staggered in the circumferential direction of the bearing.
9. A wind turbine, characterized in that, Comprising the bearing according to any one of claims 1-8.