Bearing, transmission system and wind generating set

Abstract

The invention relates to a bearing, a transmission system and a wind generating set. The bearing comprises a first annular part and a second annular part, and the first annular part and the second annular part are arranged in a sleeving mode. The rolling body is arranged between the first annular part and the second annular part; the first annular part comprises a stirring part, and the stirring part is used for providing acting force towards the rolling body for the lubricant; and the rolling bodies and the stirring parts are arranged at intervals in the axial direction of the bearing. According to the bearing, the transmission system and the wind generating set, the lubricant can be stirred and pushed to flow towards the bearing along with rotation of the rotating shaft, so that the bearing is in a good lubrication state.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a bearing, a transmission system and a wind power generator set. Background Art

[0002] In a wind turbine generator set, the rotation of the blades and the hub is usually transmitted to the rotor of the generator through a shaft system. The rotating shaft is installed on the fixed shaft through a bearing, and a lubricant receiving chamber is set at the end of the rotating shaft so that the lubricant in the receiving chamber can infiltrate the bearing and maintain the lubrication of the bearing. However, the lubricant itself is a viscous fluid with poor fluidity. It is easy to harden when stored in the receiving chamber for a long time, which further reduces the fluidity of the lubricant, making it impossible for the lubricant in the receiving chamber to maintain the good lubrication of the bearing, thereby causing bearing wear. Summary of the invention

[0003] The embodiments of the present application provide a bearing, a transmission system and a wind turbine generator set, which can stir the lubricant and push the lubricant toward the bearing as the shaft rotates, so that the bearing is in a good lubricated state.

[0004] In the first aspect, an embodiment of the present application provides a bearing, comprising: a first annular portion and a second annular portion, the first annular portion and the second annular portion being arranged in a mutually nested manner; a rolling body, arranged between the first annular portion and the second annular portion; wherein the first annular portion comprises a stirring portion, the stirring portion being used to provide a force to the lubricant toward the rolling body; along the axial direction of the bearing, the rolling body and the stirring portion are arranged at intervals.

[0005] According to an embodiment of the first aspect of the present application, the first annular portion further includes an axial portion; along the radial direction of the bearing, the axial portion protrudes from the end surface of the second annular portion, and the stirring portion is arranged on the axial portion.

[0006] According to an embodiment of the first aspect of the present application, the axial portion and the stirring portion are coaxially arranged, and the axial portion and the stirring portion are an integral structure.

[0007] According to an embodiment of the first aspect of the present application, the stirring portion is in a cylindrical spiral shape, and the stirring portion includes at least one blade.

[0008] According to an embodiment of the first aspect of the present application, the number of blades is at least two, and along the axial direction of the bearing, the orthographic projections of at least two blades overlap.

[0009] According to an embodiment of the first aspect of the present application, along the radial direction of the bearing, the distance from the outer edge of the rolling body to the axis of the bearing is less than or equal to the outer edge diameter of the stirring portion.

[0010] According to the embodiment of the first aspect of the present application, the rolling body is cylindrical, and the distance from the axis of the rolling body to the axis of the bearing gradually increases along the axial direction of the bearing close to the stirring part; the second annular portion is located on the radial outside of the first annular portion along the bearing, and an annular positioning groove is provided on the side of the first annular portion facing the second annular portion; a retaining frame is also provided between the first annular portion and the second annular portion, and the retaining frame limits the rolling of the rolling body in the annular positioning groove.

[0011] In a second aspect, an embodiment of the present application provides a transmission system, comprising: a shaft system assembly, comprising a rotating shaft and a fixed shaft which are arranged mutually in a nested manner; a bearing of an embodiment of the first aspect of the present application; along the radial direction of the rotating shaft, the bearing is arranged between the fixed shaft and the rotating shaft, the first annular portion is connected to the rotating shaft, and the second annular portion is connected to the fixed shaft; an end cover, connected to one end of the rotating shaft along its own axial direction, a first gap space is enclosed between the end cover, the shaft system assembly and the bearing, at least part of the stirring portion is located in the first gap space, and the first gap space is used to accommodate a lubricant.

[0012] According to an embodiment of the second aspect of the present application, the end cover includes a first axial extension portion and a first radial extension portion, the first axial extension portion is connected to the rotating shaft, the first axial extension portion protrudes out of the first radial extension portion along the axial direction of the rotating shaft, at least part of the first annular portion is sleeved on the first axial extension portion, and the first radial extension portion and the first annular portion abut against each other along the axial direction of the rotating shaft.

[0013] According to an embodiment of the second aspect of the present application, it also includes a sealing ring and a sealing contact ring, the sealing contact ring is connected to the fixed shaft, at least part of the sealing contact ring is located on the radial outside of the first gap space along the rotating shaft; a second gap space is provided between the sealing contact ring and the first radial extension portion, and the sealing ring is arranged in the second gap space.

[0014] According to an embodiment of the second aspect of the present application, the second gap space extends in the axial direction; and in the axial direction, an orthographic projection of the second gap space at least partially overlaps with an orthographic projection of the agitating portion.

[0015] According to an embodiment of the second aspect of the present application, the fixed shaft includes a second axial extension portion and a second radial extension portion, the second radial extension portion extends radially inward along the radial direction of the rotating shaft, and the second axial extension portion extends axially toward the end cover of the rotating shaft; the second axial extension portion is sleeved on the second annular portion, and the second radial extension portion abuts against the second annular portion along the axial direction of the rotating shaft.

[0016] According to an embodiment of the second aspect of the present application, the second axial extension portion is provided with a lubricant injection hole penetrating through the second axial extension portion, and the lubricant injection hole is communicated with the first gap space.

[0017] In a third aspect, a wind turbine generator set includes: a nacelle; a transmission system of the second aspect of the present application, disposed in the nacelle; a generator, including a rotor and a stator that are rotatably matched, the rotor being connected to a rotating shaft, and the stator being connected to a fixed shaft.

[0018] In the bearing, transmission system and wind turbine generator set provided by the embodiment of the present application, the first annular portion and the second annular portion are mutually sleeved, the rolling body is arranged between the first annular portion and the second annular portion, and the first annular portion and the second annular portion rotate relatively to form the bearing of the embodiment of the present application. A stirring portion is arranged on the first annular portion, and when the first annular portion rotates relative to the second annular portion, the stirring portion rotates together as a part of the first annular portion, thereby stirring the lubricant on the axial side of the bearing, promoting the lubricant to flow toward the rolling body, so that the bearing of the embodiment of the present application can be in a good lubrication state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A structural schematic diagram of a bearing according to an embodiment of the present application.

[0021] Figure 2 A schematic diagram of the internal structure of a bearing according to an embodiment of the present application.

[0022] Figure 3 for Figure 2 A local enlarged view of area A of the bearing of an embodiment of the present application.

[0023] Figure 4 A schematic structural diagram of the first annular portion of the bearing according to an embodiment of the present application.

[0024] Figure 5 A schematic diagram of the internal structure of a transmission system according to an embodiment of the present application.

[0025] Figure 6 for Figure 5 A partially enlarged view of area B of the transmission system of an embodiment of the present application.

[0026] Figure 7 A schematic diagram of the structure of a wind turbine generator set according to an embodiment of the present application.

[0027] Reference numerals:

[0028] 1. bearing; 11. first annular portion; 111. stirring portion; 112. axial portion; 113. blades; 114. annular positioning groove; 12. second annular portion; 13. rolling element; 14. retaining frame;

[0029] 2. Shaft assembly; 21. Rotating shaft; 22. Fixed shaft; 221. Second axial extension portion; 222. Second radial extension portion; 223. Lubricant injection hole;

[0030] 3. End cover; 31. First axial extension portion; 32. First radial extension portion;

[0031] 4. Sealing ring; 5. Sealing contact ring; 6. Nacelle; 7. Generator; 71. Rotor; 72. Stator;

[0032] S1, first gap space; S2, second gap space.

[0033] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0034] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0035] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] Wind turbines use a main shaft system for transmission, so that the rotating blades and hub can drive the rotor of the generator to rotate relative to the stator, thereby making the generator generate electricity. In the shaft system, the rotating shaft rotates relative to the fixed shaft, and a bearing is provided between the rotating shaft and the fixed shaft. In order to keep the bearings lubricated, a chamber for containing lubricants is provided on the inner side of the end cover of the shaft system, so that the lubricant can gradually flow to the bearings, keeping the bearings lubricated. However, lubricants are viscous fluids with poor fluidity. Lubricants that remain in the chamber for a long time may become hardened and agglomerated, making it difficult for the lubricant to flow to the bearings. The lubrication state of the bearings will deteriorate, and the wear will increase.

[0037] In view of the above problems, the present application proposes a bearing, a transmission system and a wind turbine generator set. The bearing includes a first annular portion, a second annular portion and a rolling body. The first annular portion and the second annular portion are arranged on each other, and the rolling body is arranged between the first annular portion and the second annular portion. The first annular portion and the second annular portion rotate relatively, and the rolling body rolls between the first annular portion and the second annular portion, so that the first annular portion and the second annular portion can rotate smoothly. The first annular portion includes a stirring portion, and the stirring portion is used to provide a force to the lubricant toward the rolling body. When the first annular portion rotates relative to the second annular portion, the stirring portion rotates together as a part of the first annular portion, thereby stirring the lubricant on the axial side of the bearing, providing a force to the lubricant, and promoting the lubricant to flow toward the rolling body, so that the bearing of the embodiment of the present application can be in a good lubrication state.

[0038] Figure 1 A structural schematic diagram of a bearing according to an embodiment of the present application.

[0039] See also Figure 1 An embodiment of the present application provides a bearing, comprising: a first annular portion 11 and a second annular portion 12, the first annular portion 11 and the second annular portion 12 are arranged in a mutually nested manner; a rolling body 13 is arranged between the first annular portion 11 and the second annular portion 12; wherein the first annular portion 11 comprises a stirring portion 111, the stirring portion 111 is used to provide a force to the lubricant toward the rolling body 13; along the axial direction of the bearing 1, the rolling body 13 and the stirring portion 111 are arranged at intervals.

[0040] The bearing 1 of the embodiment of the present application can be used for relative rotation between two components. For example, the bearing 1 of the embodiment of the present application can be used for relative rotation between the rotating shaft 21 and the fixed shaft 22. The first annular portion 11 and the second annular portion 12 are mutually sleeved and can rotate relative to each other. In order to facilitate the description of the embodiment of the present application, the rotation of the first annular portion 11 is taken as an example. It should be noted that the first annular portion 11 can rotate relative to the second annular portion 12, and the second annular portion 12 can rotate or not rotate.

[0041] The rolling body 13 is disposed between the first annular portion 11 and the second annular portion 12. The number of the rolling body 13 can be multiple, so that the first annular portion 11 can rotate smoothly and stably relative to the second annular portion 12, and the axis of the first annular portion 11 coincides with the axis of the second annular portion 12 to form the axis of the bearing 1 of the embodiment of the present application. For example, in the embodiment of the present application, the rolling body 13 can be spherical, so that the bearing 1 of the embodiment of the present application forms a ball bearing 1, and the rolling body 13 can also be cylindrical, so that the bearing 1 of the embodiment of the present application forms a roller bearing 1.

[0042] The first annular portion 11 includes a stirring portion 111, which is used to stir the lubricant around the bearing of the embodiment of the present application and provide a force to the lubricant toward the rolling element 13 so that the lubricant can flow to the rolling element 13. When the first annular portion 11 is located on the outside of the second annular portion 12, the stirring portion 111 extends toward the inside of the bearing 1 of the embodiment of the present application; when the first annular portion 11 is located on the inside of the second annular portion 12, the stirring portion 111 extends toward the outside of the bearing 1 of the embodiment of the present application. Along the axial direction of the bearing 1, the rolling element 13 and the stirring portion 111 are arranged at intervals, and a gap is left between the rolling element 13 and the stirring portion 111. A space for accommodating lubricant can be set on one side of the axial direction of the bearing 1 of the embodiment of the present application, and the stirring portion 111 can stir the lubricant so that the lubricant enters the gap between the rolling element 13 and the stirring portion 111, and then enters the gap between the rolling element 13 and the first annular portion 11, and the gap between the rolling element 13 and the second annular portion 12, so that the bearing 1 of the embodiment of the present application can maintain a good lubrication state and extend the service life.

[0043] Figure 2 A schematic diagram of the internal structure of a bearing according to an embodiment of the present application. Figure 3 for Figure 2 A local enlarged view of area A of the bearing of an embodiment of the present application.

[0044] For further information, see Figure 2 and Figure 3 , and combined with Figure 1 The first annular portion 11 further includes an axial portion 112 ; along the radial direction of the bearing 1 , the axial portion 112 protrudes from the end surface of the second annular portion 12 , and the stirring portion 111 is disposed on the axial portion 112 .

[0045] Along the axial direction of the bearing 1 of the embodiment of the present application, one end of the first annular portion 11 protrudes from the end surface of the second annular portion 12, wherein the protruding portion is the axial portion 112. The axial portion 112 extends along the axial direction of the bearing 1 of the embodiment of the present application, and the stirring portion 111 is arranged on the axial portion 112. When the first annular portion 11 rotates relative to the second annular portion 12, the axial portion 112 and the stirring portion 111 also rotate together to stir the lubricant. When the rotating shaft is connected to the first annular portion 11 and rotates, the stirring portion 111 will encounter a certain resistance when stirring the lubricant. The axial portion 112 can increase the connection area between the rotating shaft and the first annular portion 11, increase the pressure between the first annular portion 11 and the rotating shaft, and then increase the friction between the first annular portion 11 and the rotating shaft, thereby reducing the risk of slipping between the first annular portion 11 and the rotating shaft.

[0046] Further, see Figures 1 to 3 The axial portion 112 and the stirring portion 111 are coaxially arranged, and the axial portion 112 and the stirring portion 111 are an integrated structure.

[0047] The axial portion 112 and the stirring portion 111 are coaxial and coincide with the axis of the first annular portion 11, so that the stirring portion 111 can uniformly stir the lubricant in the circumferential direction of the bearing 1 of the embodiment of the present application, so that the bearing 1 of the embodiment of the present application can maintain a uniform and good lubrication state in the circumferential direction. In addition, the first annular portion 11 is an integral structure as a whole, which can improve the structural strength of the first annular portion 11 and facilitate processing and manufacturing.

[0048] Further, see Figures 1 to 3 The stirring portion 111 is in a cylindrical spiral shape and includes at least one blade 113 .

[0049] The stirring portion 111 is in the shape of a columnar spiral as a whole. When the stirring portion rotates, the columnar spiral stirring portion 111 can stir the lubricant and push the lubricant to flow toward the rolling body 13. There is at least one blade 113, which is connected to the axial portion 112 to form the stirring portion 111. When the number of blades 113 is one, a single blade 113 forms a columnar spiral structure similar to a thread; when the number of blades 113 is multiple, each blade 113 can be a part of the columnar spiral structure. The embodiment of the present application is described by taking the number of blades 113 as an example. When the first annular portion 11 rotates, the multiple blades 113 can generate an axial force on the lubricant along the axial direction of the bearing 1 of the embodiment of the present application while stirring the lubricant, further promoting the lubricant to flow to the rolling body 13, so that the bearing 1 of the embodiment of the present application is in a good lubrication state.

[0050] Further, see Figures 1 to 3 The number of blades 113 is at least two, and along the axial direction of the bearing 1, the orthographic projections of at least two blades 113 overlap.

[0051] The number of blades 113 can be multiple. Under the premise that the dimension of the stirring portion 111 along the axial direction of the embodiment of the present application is a preset dimension, the lead angle of the blade 113 can be appropriately reduced by appropriately increasing the number of blades 113. Therefore, the blade 113 can stir the lubricant and push the lubricant along the axial direction of the bearing 1 of the embodiment of the present application, and the resistance generated by the lubricant to the blade 113 is within the range that the blade 113 can withstand. In addition, along the axial direction of the bearing 1 of the embodiment of the present application, the orthographic projections of at least two blades 113 overlap, so that the lubricant needs to be stirred and pushed by the blade 113 before flowing to the rolling body 13, so that the lubricant can more easily enter the gap around the rolling body 13.

[0052] Further, see Figures 1 to 3 , along the radial direction of the bearing 1 , the distance from the outer edge of the rolling element 13 to the axis of the bearing 1 is less than or equal to the outer edge diameter of the stirring portion 111 .

[0053] The rolling body 13 rolls between the first annular portion 11 and the second annular portion 12 and sweeps the annular space, the outer edge diameter of which is the distance from the outer edge of the rolling body 13 to the axis of the bearing 1. The outer edge diameter of the stirring portion 111 is larger than the diameter, so along the axial direction of the bearing 1 of the embodiment of the present application, the stirring portion 111 will cover one side of the rolling portion, so that the lubricant needs to be stirred and pushed by the blades 113 before flowing to the rolling body 13, so that the lubricant can more easily enter the gap around the rolling body 13.

[0054] Figure 4 A schematic structural diagram of the first annular portion of the bearing according to an embodiment of the present application.

[0055] For further information, see Figure 4 , and combined with Figures 1 to 3 The rolling body 13 is cylindrical, and the distance between the axis of the rolling body 13 and the axis of the bearing 1 gradually increases along the axial direction of the bearing 1 close to the stirring portion 111; the second annular portion 12 is located on the radial outside of the first annular portion 11 along the bearing 1, and an annular positioning groove 114 is provided on the side of the first annular portion 11 facing the second annular portion 12; a retaining frame 14 is also provided between the first annular portion 11 and the second annular portion 12, and the retaining frame 14 limits the rolling of the rolling body 13 in the annular positioning groove 114.

[0056] The rolling element 13 is cylindrical, and the bearing 1 of the embodiment of the present application forms a roller bearing 1. The axis of a single rolling portion is inclined relative to the axis of the bearing 1 of the embodiment of the present application, so that the embodiment of the present application is formed into a thrust roller bearing 1. The first annular portion 11 is arranged on the inner side of the second annular portion 12 and is connected to the rotating shaft. While the rotating shaft rotates smoothly, it also provides a certain axial force. In addition, when assembling the bearing 1 of the embodiment of the present application, because the distance from the axis of the rolling element 13 to the axis of the bearing 1 gradually increases along the axial direction of the bearing 1 close to the stirring portion 111, the interference of the stirring portion 111 in the process of installing the rolling element 13 can be reduced. The annular positioning groove 114 is used to accommodate the rolling element 13, and the rolling element 13 will roll in the annular positioning groove 114. The retaining frame 14 is arranged between the first annular portion 11 and the second annular portion 12. In addition to limiting the rolling element 13 in the annular positioning groove 114, it can also make multiple rolling elements 13 evenly distributed in the circumferential direction of the bearing 1 of the embodiment of the present application.

[0057] Figure 5 A schematic diagram of the internal structure of a transmission system according to an embodiment of the present application. Figure 6 for Figure 5 A partially enlarged view of area A of the transmission system of an embodiment of the present application.

[0058] See also Figure 5 and Figure 6 The embodiment of the present application also provides a transmission system, including: a shaft system component 2, including a rotating shaft 21 and a fixed shaft 22 that are sleeved with each other; the bearing 1 of the aforementioned embodiment of the present application; along the radial direction of the rotating shaft 21, the bearing 1 is arranged between the fixed shaft 22 and the rotating shaft 21, the first annular portion 11 is connected to the rotating shaft 21, and the second annular portion 12 is connected to the fixed shaft 22; an end cover 3, connected to one end of the rotating shaft 21 along its own axial direction, the end cover 3, the shaft system component 2 and the bearing 1 enclose a first gap space S1, at least part of the stirring portion 111 is located in the first gap space S1, and the first gap space S1 is used to accommodate lubricant.

[0059] The shaft assembly 2 is used to transmit the rotation of the blades 113 and the hub to the rotor 71 of the generator 7, so that the rotor 71 of the generator 7 rotates relative to the stator 72. The rotating shaft 21 can be directly or indirectly connected to the rotor 71 of the generator 7, and the fixed shaft 22 can be directly or indirectly connected to the stator 72 of the generator 7. This application is a summary of embodiments. The rotating shaft 21 and the fixed shaft 22 of the shaft assembly 2 are sleeved with each other. The rotating shaft 21 can be sleeved on the outside of the fixed shaft 22, and the rotating shaft 21 can also be sleeved on the inside of the fixed shaft 22. For the convenience of description, in the embodiments of this application, the fixed shaft 22 is sleeved on the outside of the rotating shaft 21 as an example for description.

[0060] The bearing 1 is arranged between the rotating shaft 21 and the fixed shaft 22 to support the rotating shaft 21 to rotate relative to the fixed shaft 22. The first annular portion 11 of the bearing 1 can be sleeved on the outer side of the rotating shaft 21, and the fixed shaft 22 can be sleeved on the outer side of the second annular portion 12. The end cover 3 is located at one end of the rotating shaft 21 and is connected to the rotating shaft 21. The end cover 3 and the rotating shaft 21 can rotate together. At this time, the end cover 3, the shaft system component 2 and the bearing 1 enclose a first gap space S1, which is used to accommodate lubricants, such as lubricating oil or grease. The bearing 1 constitutes a part of the side wall of the first gap space S1. The lubricant located in the first gap space S1 can flow into the gap of the bearing 1 and keep the bearing 1 in a lubricated state. In the embodiment of the present application, since the first annular portion 11 includes the stirring portion 111, when the rotating shaft 21 drives the first annular portion 11 to rotate, the stirring portion 111 rotates in the first gap space S1 and stirs the lubricant in the first gap space S1, so that most of the lubricant is in a flowing state in the first space, thereby reducing the possibility of lubrication in the first space becoming hardened and agglomerated, promoting the lubricant to flow to the rolling element 13, and keeping the bearing 1 in a good lubrication state.

[0061] Further, see Figure 5 and Figure 6 The end cover 3 includes a first axial extension portion 31 and a first radial extension portion 32. The first axial extension portion 31 is connected to the rotating shaft 21. The first axial extension portion 31 protrudes from the first radial extension portion 32 along the axial direction of the rotating shaft 21. At least part of the first annular portion 11 is sleeved on the first axial extension portion 31. The first radial extension portion 32 and the first annular portion 11 are abutted against each other along the axial direction of the rotating shaft 21.

[0062] The cross-sectional shape of the end cover 3 along the cross-sectional plane where its own axis is located can be T-shaped. The first axial extension portion 31 extends axially to form a columnar structure. The first radial extension portion 32 is arranged on the outside of the first axial extension portion 31. Axially, at least a portion of the first axial extension portion 31 protrudes from the end face of the first radial extension portion 32 and extends toward the bearing 1. The first annular portion 11 is sleeved on the first axial extension portion 31 and abuts against the first radial extension portion 32. Considering that the bearing 1 adopts the form of a thrust roller bearing 1, the first radial extension portion 32 can fix the first annular portion 11 along the axial direction of the bearing 1.

[0063] Further, see Figure 5 and Figure 6 , and also includes a sealing ring 4 and a sealing contact ring 5. The sealing contact ring 5 is connected to the fixed shaft 22, and at least part of the sealing contact ring 5 is located on the radial outside of the first gap space S1 along the rotating shaft 21; a second gap space S2 is provided between the sealing contact ring 5 and the first radial extension portion 32, and the sealing ring 4 is arranged in the second gap space S2.

[0064] The sealing contact ring 5 is connected to the fixed shaft 22, so the end cover 3 will rotate relative to the sealing contact ring 5. A second gap space S2 is provided between the sealing contact ring 5 and the first radial extension portion 32 to reduce the possibility of interference in the relative rotation between the end cover 3 and the sealing contact ring 5. Considering that the first gap space S1 is connected to the second gap space S2, the sealing ring 4 provided in the second gap space S2 can reduce the risk of lubricant leaking from the second gap space S2.

[0065] Further, see Figure 5 and Figure 6 , the second gap space S2 extends in the axial direction; along the axial direction, the orthographic projection of the second gap space S2 at least partially overlaps with the orthographic projection of the stirring portion 111.

[0066] When the stirring portion 111 rotates, the stirring portion 111 pushes the lubricant to flow toward the rolling element 13. At this time, the pressure of the lubricant is reduced when the stirring portion 111 faces the side of the first radial extension portion 32. Since the orthographic projection of the second gap space S2 overlaps with the orthographic projection of the stirring portion 111, the pressure of the lubricant acting on the sealing ring 4 in the second gap space S2 is reduced, thereby reducing the risk of failure of the sealing ring 4 and lubricant leakage.

[0067] Further, see Figure 5 and Figure 6 The fixed shaft 22 includes a second axial extension portion 221 and a second radial extension portion 222. The second radial extension portion 222 extends radially inwardly along the rotating shaft 21, and the second axial extension portion 221 extends axially toward the end cover 3 along the rotating shaft 21; the second axial extension portion 221 is sleeved on the second annular portion 12, and the second radial extension portion 222 abuts against the second annular portion 12 along the axial direction of the rotating shaft 21.

[0068] The second radial extension portion 222 of the fixed shaft 22 extends radially inward, and the second annular portion 12 of the bearing 1 abuts against the second radial extension portion 222. Considering that the bearing 1 adopts a thrust roller bearing 1, the axial position of the bearing 1 can be fixed by the second radial extension portion 222 of the fixed shaft 22 and the first axial extension portion 31 of the end cover 3, so that the relative rotation between the rotating shaft 21, the bearing 1 and the fixed shaft 22 is more stable.

[0069] Further, see Figure 5 and Figure 6 The second axial extension portion 221 is provided with a lubricant injection hole 223 penetrating therethrough, and the lubricant injection hole 223 is communicated with the first gap space S1.

[0070] The axial end of the second axial extension portion 221 of the fixed shaft 22 can be connected to the sealing contact ring 5, and the second axial extension portion 221 can form the radial outer side wall of the first gap space S1. A lubricant injection hole 223 is provided in the second axial extension portion 2211, and the lubricant injection hole 223 passes through the second axial extension portion 221 and communicates with the first gap space S1. Lubricant can be injected into the first gap space S1 or replenished through the lubricant injection hole 223. When the lubricant flows to the bearing 1 and is gradually consumed, the lubricant can be replenished into the first gap space S1 through the lubricant injection hole 223. In order to reduce the risk of lubricant backflow, lubricant is replenished into the first gap space S1 when the rotating shaft 21 is stationary relative to the fixed shaft 22.

[0071] Figure 7 A schematic diagram of the structure of a wind turbine generator set according to an embodiment of the present application.

[0072] See also Figure 7 The embodiment of the present application also provides a wind turbine generator set, including: a nacelle 6; the transmission system of the aforementioned embodiment of the present application, arranged in the nacelle 6; a generator 7, including a rotor 71 and a stator 72 that are rotatably matched, the rotor 71 is connected to the rotating shaft 21, and the stator 72 is connected to the fixed shaft 22.

[0073] The rotor 71 of the generator 7 is directly or indirectly connected to the rotating shaft 21 of the transmission system. For example, it can be indirectly connected through a speed increasing device. For example, the rotor 71 and the rotating shaft 21 are indirectly connected through a gear box to increase the speed of the rotor 71. The stator 72 of the generator 7 is connected to the fixed shaft 22 of the transmission system. The transmission system is located in the nacelle 6, and the nacelle 67 can protect and support the transmission system.

[0074] In summary, the embodiments of the present application provide a bearing, a transmission system and a wind turbine generator set. Among them, the first annular portion and the second annular portion are mutually sleeved, the rolling body is arranged between the first annular portion and the second annular portion, and the first annular portion and the second annular portion rotate relatively to form the bearing of the embodiment of the present application. A stirring portion is arranged on the first annular portion, and when the first annular portion rotates relative to the second annular portion, the stirring portion rotates together as a part of the first annular portion, thereby stirring the lubricant on the axial side of the bearing, promoting the lubricant to flow toward the rolling body, so that the bearing of the embodiment of the present application can be in a good lubrication state.

[0075] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bearing, characterized in that: include: A first annular portion (11) and a second annular portion (12), wherein the first annular portion (11) and the second annular portion (12) are sleeved with each other; A rolling body (13) is arranged between the first annular portion (11) and the second annular portion (12); The first annular portion (11) comprises a stirring portion (111), and the stirring portion (111) is used to provide a force acting on the lubricant toward the rolling element (13); along the axial direction of the bearing (1), the rolling element (13) and the stirring portion (111) are arranged at intervals.

2. The bearing according to claim 1, characterized in that: The first annular portion (11) further comprises an axial portion (112); along the radial direction of the bearing (1), the axial portion (112) protrudes from the end surface of the second annular portion (12), and the stirring portion (111) is arranged on the axial portion (112).

3. The bearing according to claim 2, characterized in that: The axial portion (112) and the stirring portion (111) are coaxially arranged, and the axial portion (112) and the stirring portion (111) are in an integrated structure.

4. The bearing according to claim 1, characterized in that: The stirring portion (111) is in a cylindrical spiral shape, and the stirring portion (111) includes at least one blade (113).

5. The bearing according to claim 4, characterized in that: The number of the blades (113) is at least two, and along the axial direction of the bearing (1), the orthographic projections of at least two blades (113) overlap.

6. The bearing according to claim 1, characterized in that: Along the radial direction of the bearing (1), the distance from the outer edge of the rolling element (13) to the axis of the bearing (1) is less than or equal to the outer edge diameter of the stirring portion (111).

7. The bearing according to claim 1, characterized in that The rolling body (13) is cylindrical, and along the axial direction of the bearing (1) approaching the stirring portion (111), the distance between the axis of the rolling body (13) and the axis of the bearing (1) gradually increases; The second annular portion (12) is located on the radially outer side of the first annular portion (11) along the bearing (1), and an annular positioning groove (114) is provided on the side of the first annular portion (11) facing the second annular portion (12); a retaining frame (14) is also provided between the first annular portion (11) and the second annular portion (12), and the retaining frame (14) restricts the rolling element (13) from rolling in the annular positioning groove (114).

8. A transmission system, characterized in that: include: A shaft system assembly (2) comprising a rotating shaft (21) and a fixed shaft (22) which are sleeved together; The bearing (1) according to any one of claims 1 to 7; along the radial direction of the rotating shaft (21), the bearing (1) is arranged between the fixed shaft (22) and the rotating shaft (21), the first annular portion (11) is connected to the rotating shaft (21), and the second annular portion (12) is connected to the fixed shaft (22); An end cover (3) is connected to one end of the rotating shaft (21) along its own axial direction, and a first gap space (S1) is formed between the end cover (3), the shaft system component (2) and the bearing (1), and at least part of the stirring part (111) is located in the first gap space (S1), and the first gap space (S1) is used to accommodate lubricant.

9. The transmission system according to claim 8, characterized in that: The end cover (3) comprises a first axial extension portion (31) and a first radial extension portion (32); the first axial extension portion (31) is connected to the rotating shaft (21); the first axial extension portion (31) protrudes from the first radial extension portion (32) along the axial direction of the rotating shaft (21); at least a portion of the first annular portion (11) is sleeved on the first axial extension portion (31); the first radial extension portion (32) and the first annular portion (11) are in abutment with each other along the axial direction of the rotating shaft (21).

10. The transmission system according to claim 9, characterized in that: The invention also comprises a sealing ring (4) and a sealing contact ring (5), wherein the sealing contact ring (5) is connected to the fixed shaft (22), and at least a part of the sealing contact ring (5) is located on the radially outer side of the first gap space (S1) along the rotating shaft (21); a second gap space (S2) is provided between the sealing contact ring (5) and the first radial extension portion (32), and the sealing ring (4) is arranged in the second gap space (S2).

11. The transmission system according to claim 10, characterized in that: The second gap space (S2) extends along the axial direction; along the axial direction, an orthographic projection of the second gap space (S2) at least partially overlaps with an orthographic projection of the stirring portion (111).

12. The transmission system according to claim 8, characterized in that: The fixed shaft (22) comprises a second axial extension portion (221) and a second radial extension portion (222); the second radial extension portion (222) extends radially inwardly of the rotating shaft (21); the second axial extension portion (221) extends axially of the rotating shaft (21) toward the end cover (3); the second axial extension portion (221) is sleeved on the second annular portion (12); the second radial extension portion (222) abuts against the second annular portion (12) along the axial direction of the rotating shaft (21).

13. The transmission system according to claim 12, characterized in that: The second axially extending portion (221) is provided with a lubricant injection hole (223) penetrating the second axially extending portion (221), and the lubricant injection hole (223) is communicated with the first gap space (S1).

14. A wind turbine generator set, characterized in that: include: Engine room (6); The transmission system according to any one of claims 8 to 13, arranged in the nacelle (6); The generator (7) comprises a rotor (71) and a stator (72) which are rotatably matched, wherein the rotor (71) is connected to the rotating shaft (21), and the stator (72) is connected to the fixed shaft (22).

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