Variable pitch bearing and wind power generation assembly
By designing a pitch bearing with a three-ring roller structure, the problem of insufficient blade load-bearing capacity in large-megawatt models has been solved, achieving more uniform load distribution and improving the bearing's load-bearing capacity, making it suitable for wind power generation equipment.
Patent Information
- Application Number
- CN202520313516.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-25
AI Technical Summary
Existing pitch bearings are insufficient to meet the load-bearing requirements of large-megawatt turbines due to the increasing size and weight of blades, especially the problem of uneven load distribution during blade angle adjustment.
Design a pitch bearing with a three-ring roller structure, including two rings of axial tapered rollers and one ring of radial rollers. The roller axes intersect at the center of the inner ring. The raceway surface and the guide surface are in line contact. A DLC coating can be used to enhance hardness. The load is shared by the raceway surface and the guide surface, and is decomposed into axial and radial loads.
With the bearing size remaining unchanged, the bending moment load and weight load caused by blade rotation are more evenly distributed, improving the load-bearing capacity and meeting the requirements of high-power wind turbines.
Smart Images
Figure CN223578124U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of wind power generation, in particular to a variable pitch bearing and a wind power generation assembly. BACKGROUND
[0002] The variable pitch bearing is applied to a wind power generation device, so that the blade realizes angle adjustment through the variable pitch bearing. Generally, the inner ring of the variable pitch bearing is fixed on the hub, the outer ring is connected with the blade root, and the rolling body (such as a ball or a roller) is arranged between the inner ring and the outer ring to allow the outer ring to rotate relative to the inner ring. With the batch application of large megawatt models, the size, weight and bearing blade root section circle of the blade are continuously increased, and the requirement for the load carrying capacity of the variable pitch bearing is also continuously increased. CONTENT OF THE UTILITY MODEL
[0003] Therefore, the present application provides a variable pitch bearing, which is configured by arranging the structure of the roller, so as to improve the load carrying capacity of the variable pitch bearing, and better meet the load carrying requirement of the large power wind wheel.
[0004] In one aspect, the present application provides a variable pitch bearing, which comprises an outer ring, an inner ring and a roller assembly; the roller assembly comprises double-row axial rollers and radial rollers, the double-row axial rollers comprise two rows of conical rollers arranged in the axial direction of the bearing, the two rows of conical rollers are respectively arranged in two axial raceways enclosed by the outer ring and the inner ring, and the axial raceway is arranged as a tapered raceway; the radial rollers are located between the double-row axial rollers in the axial direction of the bearing and are arranged in a radial raceway enclosed by the outer ring and the inner ring.
[0005] In one possible implementation, each of the two rows of conical rollers has a narrow end facing the inner ring and a wide end facing the outer ring, so that the roller axes of the two rows of conical rollers intersect at the center of the inner ring.
[0006] In one possible implementation, at least one of the two end faces of the conical roller in the axial direction of the roller is an arc face and is in line contact with the guide face of the raceway.
[0007] In one possible implementation, a coating is arranged on at least one of the two end faces of the conical roller in the axial direction of the roller, so as to enhance the hardness of the end face.
[0008] In one possible implementation, the coating is a DLC coating.
[0009] In one possible implementation, the axial raceway comprises four contact faces, i.e., an upper raceway face, a lower raceway face, a front guide face and a rear guide face, and at least one or any combination of the four contact faces is provided with a coating.
[0010] In a possible implementation, the radial rollers are cylindrical rollers, and are arranged along the axial direction of the inner ring.
[0011] In a possible implementation, the outer ring comprises an upper half ring and a lower half ring arranged in the axial direction, and the upper half ring and the lower half ring are detachably connected.
[0012] In a possible implementation, the application further comprises an axial holder and a radial holder, the conical rollers are arranged in the conical groove of the axial holder, and the radial rollers are arranged in the sleeve of the radial holder.
[0013] The application also provides a wind power generation assembly comprising a blade, a hub, and the variable pitch bearing according to any one of the above, the root of the blade is connected to one of the inner ring or the outer ring, and the hub is connected to the other one of the inner ring or the outer ring.
[0014] The variable pitch bearing provided by the application comprises three rings of rollers arranged along the axial direction of the bearing, wherein the radial rollers are arranged in the middle, can bear the load applied in the axial direction of the bearing, such as the weight of the blade or the load in the axial direction caused by the change of the wind direction, and the two rings of axial rollers are conical rollers, i.e., the rollers are in the shape of a pyramid, can decompose the bending moment load applied by the blade into loads in the axial and radial directions of the bearing, and the loads are borne by the raceway surface and the guide surface of the raceway, so that, on the basis of the same size of the bearing, compared with the bearing with other roller structures, the variable pitch bearing of the application can more evenly bear the bending moment load caused by the rotation of the blade and the load such as the weight of the blade, and the load bearing capacity is improved. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 Fig. 1 shows the structure of the variable pitch bearing in the embodiment of the application;
[0016] Figure 2 Fig. 2 shows the schematic diagram of the roller assembly in the embodiment of the application;
[0017] Figure 3 Fig. 3 shows the schematic diagram of the raceway in the embodiment of the application;
[0018] Figure 4 Fig. 4 shows the schematic diagram of the axial holder in the embodiment of the application;
[0019] Figure 5 Fig. 5 shows the schematic diagram of the radial holder in the embodiment of the application.
[0020] Figures 1-5 In a possible implementation, the radial rollers are cylindrical rollers, and are arranged along the axial direction of the inner ring.
[0021] 1, inner ring; 2, outer ring; 201, upper half ring; 202, lower half ring; 3, tapered roller; 301, end face; 4, radial roller; 5, raceway; 501, upper raceway surface; 502, lower raceway surface; 503, front guide surface; 504, rear guide surface; 6, axial retainer; 7, radial retainer. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.
[0023] Please refer to the drawings in the Figures 1-5 The embodiments of the present application provide a variable pitch bearing, which comprises an outer ring 2, an inner ring 1 and a roller assembly; the roller assembly comprises double-row axial rollers and radial rollers 4, that is, three rows of rollers are arranged, and the outer ring 2 and the inner ring 1 enclose three raceways 5. For the sake of distinction, in this paper, the raceway 5 of the double-row axial roller is called the axial raceway 5, and the raceway 5 of the radial roller 4 is called the radial raceway 5. The double-row axial roller comprises two rows of axial rolling bodies arranged in the axial direction of the bearing. Specifically, the axial rolling body is a tapered roller 3, and the two rows of tapered rollers 3 are respectively arranged to roll in the two axial raceways 5 enclosed by the outer ring 2 and the inner ring 1, and the axial raceway 5 is correspondingly arranged as a conical raceway 5. Specifically, the axial raceway 5 comprises four contact surfaces, i.e., an upper raceway surface 501, a lower raceway surface 502, a front guide surface 503 and a rear guide surface 504. The upper raceway surface 501 and the lower raceway surface 502 are in contact with the conical surface of the tapered roller 3, and the front guide surface 503 and the rear guide surface 504 are in contact with the axial end face 301 of the tapered roller 3. The radial roller 4 is located between the double-row axial rollers in the axial direction of the bearing. The radial roller 4 can be a cylindrical roller arranged in the axial direction of the bearing and arranged to roll in the radial raceway 5 enclosed by the outer ring 2 and the inner ring 1.
[0024] In this way, the variable pitch bearing provided by the present application is arranged with three rows of rollers arranged in the axial direction of the bearing, among which the radial roller 4 is arranged in the middle and can bear the load applied in the axial direction of the bearing, such as the weight of the blade or the load in this direction caused by the change of wind direction, and the two rows of axial rollers are both tapered rollers 3, that is, the rollers are in the shape of a pyramid, which can decompose the bending moment load applied by the blade into loads in the axial and radial directions of the bearing, which are jointly borne by the raceway surfaces and guide surfaces of the raceway 5. In this way, on the basis of the same size of the bearing, compared with the bearing with other roller structures, the variable pitch bearing provided by the present application can more evenly bear the bending moment load caused by the rotation of the blade and the load such as the weight of the blade, the bearing capacity is improved, and the load bearing demand of the high-power wind wheel can be better met.
[0025] Specifically, each of the two rows of tapered rollers 3 is arranged with the narrow end facing the inner ring 1 and the wide end facing the outer ring 2, so that the roller axes (the axes of the rollers themselves) of the two rows of tapered rollers 3 intersect at the center of the inner ring 1 (on the central axis of the inner ring 1).
[0026] The two end faces 301 of the tapered roller 3 in the axial direction of the tapered roller 3 are at least one arc face, and are in line contact with the guide surface of the raceway 5. Preferably, both of the two end faces 301 of the tapered roller 3 are arc faces, which can also be called spherical faces. In this way, both of the two end faces 301 of the tapered roller 3 are in line contact with the guide surface of the raceway 5, which can reduce the friction and wear between the roller and the guide surface during the rolling of the roller, facilitate the bearing of the load, and also facilitate the enhancement of the durability.
[0027] In some embodiments, at least one of the two end faces 301 of the tapered roller 3 in the axial direction of the tapered roller 3 is provided with a coating to enhance the hardness of the end face 301. Preferably, both of the two end faces 301 of the tapered roller 3 are provided with a coating on the surface, which can improve the surface hardness of the tapered roller 3, reduce surface wear, facilitate the long-term stability of the roller, and facilitate the improvement of the long-term bearing performance of the bearing.
[0028] Specifically, the coating can be a DLC coating. The DLC (Diamond-Like Carbon Coating) coating is a surface coating technology of a high-molecular carbon film formed on the surface of a metal. This coating can be made by different processes such as ion plating and physical vapor deposition. Alternatively, the coating can also be a nitriding coating.
[0029] The axial raceway 5 includes four contact surfaces, i.e., an upper raceway surface 501, a lower raceway surface 502, a front guide surface 503, and a rear guide surface 504. At least one or any combination of the four contact surfaces is provided with a coating.
[0030] The outer ring 2 and the inner ring 1 are sleeved, and the side surface of the inner ring 1 and the side surface of the outer ring 2 are provided in a concave-convex matching manner to form the axial raceway 5 accommodating the two rows of axial rollers and the radial raceway 5 accommodating the radial rollers 4.
[0031] Both the tapered rollers 3 and the radial rollers 4 are fixed by roller retainers. That is, the pitch bearing is provided with two axial retainers 6 and one radial retainer 7. The axial retainer 6 is annular, which can also be called an annular block, and is provided with grooves for embedding the tapered rollers 3. Each adjacent two raceways 5 are separated by a spacer. The radial retainer 7 is annular and includes an annular strip and a plurality of sleeves provided on the annular strip. The radial rollers 4 are arranged to roll in the sleeves.
[0032] During assembly, the inner ring 1 and the outer ring 2 clamp the retainers, so as to assemble the entire bearing.
[0033] In some embodiments, the outer ring 2 comprises an upper half ring 201 and a lower half ring 202 stacked along the axial direction, and the upper half ring 201 and the lower half ring 202 are detachably connected, for example, by fasteners such as screws, bolts, etc. In this way, the bearing assembly is facilitated, and the rollers can be assembled with high precision.
[0034] The embodiments of the present application also provide a wind power generation assembly, comprising a blade, a hub and the variable pitch bearing of any of the above embodiments, the root of the blade is connected with one of the inner ring 1 or the outer ring 2, and the hub is connected with the other one of the inner ring 1 or the outer ring 2.
[0035] The above describes the basic principles of the present application in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects, etc. cannot be considered as the must-have of each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limited to the above specific details. The above specific details do not limit the present application to be necessarily implemented with the above specific details.
[0036] The components and devices involved in the present application are only illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, configured in any manner. Words such as "include", "contain", "have", etc. are open-ended words, mean "include but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.
[0037] It should also be noted that in the devices and equipment of the present application, the components can be disassembled and / or reassembled. These disassembly and / or reassembly should be considered as equivalent solutions of the present application.
[0038] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be consistent with the widest scope consistent with the principles and novel features disclosed herein.
[0039] The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the forms disclosed herein. Although various example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations, which fall within the scope of the application.
[0040] The above description is merely illustrative of the application, and is not intended to limit the scope of the application that is defined by the appended claims.
Claims
1. A pitch bearing, characterized in that, Includes outer ring, inner ring, and roller assembly; The roller assembly includes double rows of axial rollers and radial rollers. The double rows of axial rollers include two conical rollers arranged along the bearing axial direction. The two conical rollers are respectively rolled within two axial raceways enclosed by the outer ring and the inner ring. The axial raceways are set as tapered raceways. The radial rollers are located between the double rows of axial rollers in the bearing axial direction and are rolled within the radial raceways enclosed by the outer ring and the inner ring.
2. The pitch bearing as described in claim 1, characterized in that, Each of the two conical rollers has its narrow end facing the inner ring and its wide end facing the outer ring, so that the roller axes of the two conical rollers intersect at the center of the inner ring.
3. The pitch bearing as described in claim 1, characterized in that, At least one of the two end faces of the tapered roller in its own axial direction is an arc surface, and it is in line contact with the guide surface of the raceway.
4. The pitch bearing as described in claim 1, characterized in that, The tapered roller has a coating on at least one of its two end faces along its axial direction to enhance the hardness of the end face.
5. The pitch bearing as described in claim 4, characterized in that, The coating is a DLC coating.
6. The pitch bearing as described in claim 1 or 4, characterized in that, The axial raceway includes four contact surfaces: an upper raceway surface, a lower raceway surface, a front guide surface, and a rear guide surface. At least one or any combination of the four contact surfaces is provided with a coating.
7. The pitch bearing as claimed in claim 1, characterized in that, The radial rollers are cylindrical rollers and are arranged along the axial direction of the inner ring.
8. The pitch bearing as described in claim 1, characterized in that, The outer ring includes an upper half ring and a lower half ring stacked along the axial direction, and the upper half ring and the lower half ring are detachably connected.
9. The pitch bearing as claimed in claim 1, characterized in that, It also includes an axial cage and a radial cage, wherein the tapered rollers are disposed within the tapered grooves of the axial cage and the radial rollers are disposed within the sleeves of the radial cage.
10. A wind power generation component, characterized in that, The bearing includes blades, a hub, and a pitch bearing as described in any one of claims 1-8, wherein the root of the blade is connected to one of the inner ring or the outer ring, and the hub is connected to the other of the inner ring or the outer ring.