Oil collecting device, yaw system and wind turbine generator set

Abstract

The application provides a grease collecting device, a yaw system and a wind turbine generator set. The grease collecting device comprises a collecting box, the collecting box comprises first and second side walls arranged opposite to each other and perpendicular to a first direction, and third and fourth side walls arranged opposite to each other and perpendicular to a second direction, the first, third, second and fourth side walls are sequentially connected in a head-tail mode, the first and second side walls are respectively arranged to abut against first and second bolts, one end of the first side wall close to the third side wall is provided with an opening, and a scraper is arranged on the third side wall and faces the first side wall, in the first direction, a first end of the scraper is located outside the third side wall, and the thickness of the first end of the scraper gradually decreases in a direction away from the second side wall, wherein the first direction and the second direction are perpendicular to each other. The application can reduce the probability of grease leakage onto the yaw brake disc, ensure that the yaw system has good braking performance, and improve the stability of the operation of the wind turbine generator set.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to an oil collection device, a yaw system, and a wind turbine generator set. Background Technology

[0002] With the development of society, human demand for energy is increasing. The large-scale extraction of fossil fuels has caused irreversible damage to the environment. Developing clean energy has become an important task for my country, among which wind power generation technology is highly favored.

[0003] A major application of wind power technology is the use of wind turbine generators to convert wind energy into mechanical energy, and then into alternating current (AC) output. Currently, most wind turbine generators employ an automatic yaw system, which includes a wind direction sensor, yaw bearing, yaw drive unit, yaw brake disc, yaw brake, and control system. The yaw bearing bears the weight of the entire nacelle and rotor, and connects the nacelle to the tower. Driven by the drive unit, the relative movement of the inner and outer rings of the yaw bearing enables the wind turbine generator to automatically align with the wind. The performance of the yaw bearing directly affects the generator's power generation efficiency and overall lifespan; therefore, proper lubrication and maintenance of the yaw bearing are crucial to ensuring its optimal operation within its designed lifespan.

[0004] Currently, wind turbine generators use automatic greaseers to lubricate the inner cavity and tooth surfaces of the yaw bearing. However, due to various reasons such as seal aging during the operation of the yaw bearing, grease may seep out of the inner cavity of the yaw bearing. The yaw brake disc is located below this position, and the space is too small to clean the seeping grease. If the seeping grease leaks onto the friction pads of the yaw brake disc, it will weaken or fail the braking performance of the yaw system, affecting the stability of the wind turbine generator's operation. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in related technologies, the purpose of this application is to provide a grease collection device, a yaw system and a wind turbine generator set. This application can collect grease seeping out of the inner cavity of the yaw bearing, thereby reducing the probability of grease leakage onto the yaw brake disc, ensuring that the yaw system has good braking performance and improving the stability of the wind turbine generator set operation.

[0006] On one hand, this application provides a grease collection device for installation on a yaw bearing. The yaw bearing has multiple bearing bolts, one of two adjacent bearing bolts is a first bolt, and the other is a second bolt. The yaw bearing rotates from the second bolt toward the first bolt. The grease collection device includes a collection box, which includes a first sidewall and a second sidewall perpendicular to a first direction and arranged opposite to each other, and a third sidewall and a fourth sidewall perpendicular to a second direction and arranged opposite to each other. The first sidewall, the third sidewall, the second sidewall, and the fourth sidewall are connected end to end. The first sidewall and the second sidewall are respectively used to abut against the first bolt and the second bolt. The first sidewall has an opening at one end near the third sidewall. The third sidewall has a scraper facing the first sidewall. In the first direction, the first end of the scraper is located outside the third sidewall, and the thickness of the first end of the scraper gradually decreases in the direction away from the second sidewall.

[0007] Wherein, the first direction and the second direction are perpendicular to each other.

[0008] Optionally, the fourth side wall of the grease collection device described above is provided with an observation window; a lower protective plate is also fitted on the outside of the collection box, the shape of which is adapted to the shape of the collection box, and the lower protective plate is located on the side away from the third side wall.

[0009] Optionally, in the grease collection device described above, both the first and second sidewalls are provided with protrusions for fixing the lower guard plate, and the opposite sidewalls of the lower guard plate are provided with sliding grooves, and the protrusions are inserted into the sliding grooves so that the lower guard plate is fixedly connected to the first and second sidewalls.

[0010] Optionally, in the grease collection device described above, a fixing rod is detachably connected to the second sidewall, and one end of the fixing rod facing away from the second sidewall is used to abut against the second bolt.

[0011] Optionally, in the grease collection device described above, the second sidewall is provided with an elongated groove extending along the second direction, and the fixing rod is detachably installed in the elongated groove by fasteners.

[0012] Optionally, the grease collection device described above may further include an installation component. The installation component includes an installation frame, which includes a first installation sidewall and a second installation sidewall perpendicular to the first direction and arranged opposite to each other, as well as a connecting wall and an installation wall perpendicular to the second direction and arranged opposite to each other. The two ends of the connecting wall are respectively connected to the first installation sidewall and the second installation sidewall. The installation wall is provided with a passage opening, through which the collection box passes and is installed in the installation component. The portion of the first sidewall facing away from the third sidewall and the portion of the second sidewall facing away from the third sidewall are respectively slidably connected to the first installation sidewall and the second installation sidewall.

[0013] Optionally, in the grease collection device described above, the first sidewall and the first mounting sidewall, as well as the second sidewall and the second mounting sidewall, are connected by a slide rail and slide groove structure.

[0014] Optionally, the mounting component of the grease collection device described above further includes an abutment portion disposed below the mounting frame along a third direction. The abutment portion includes a first connecting rod, a second connecting rod, a mounting shaft, and a roller. The first connecting rod and the mounting shaft are disposed along the third direction. One end of the first connecting rod is connected to the mounting frame, and the other end of the first connecting rod is connected to the second connecting rod. The mounting shaft is disposed at the end of the second connecting rod opposite to the first connecting rod. The roller is sleeved on the mounting shaft and is located on the side of the second connecting rod facing the mounting frame.

[0015] Among them, the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] On the other hand, this application provides a yaw system including a yaw bearing, the yaw bearing having a plurality of bearing bolts, one of two adjacent bearing bolts being a first bolt and the other being a second bolt, the yaw bearing rotating from the second bolt toward the first bolt side, the first bolt and the second bolt being provided with a grease collection device as described above.

[0017] In another aspect, this application provides a wind turbine generator set, including the yaw system described above.

[0018] This application provides an grease collection device, a yaw system, and a wind turbine generator set. The grease collection device includes a collection box, which includes a first sidewall and a second sidewall perpendicular to a first direction and arranged opposite to each other, and a third sidewall and a fourth sidewall perpendicular to a second direction and arranged opposite to each other. The first sidewall, the third sidewall, the second sidewall, and the fourth sidewall are connected end to end. The first sidewall and the second sidewall are respectively used to abut against a first bolt and a second bolt. The first sidewall has an opening at one end near the third sidewall. The third sidewall has a scraper facing the first sidewall. In the first direction, the first end of the scraper is located outside the third sidewall, and the thickness of the first end of the scraper gradually decreases in the direction away from the second sidewall. The first direction and the second direction are perpendicular to each other. The grease collection device of this application can be snapped between the first and second bolts on the yaw bearing during use. When the yaw bearing rotates from the second bolt to the first bolt, the scraper can scrape off the grease that seeps out of the inner cavity of the yaw bearing, so that the grease falls into the collection box through the opening and is collected, reducing the probability of grease leakage onto the yaw brake disc, ensuring that the yaw system has good braking performance, and improving the stability of the wind turbine generator operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A simplified structural diagram of an oil collection device provided in an embodiment of this application;

[0021] Figure 2 This is a side view of an oil collection device provided in an embodiment of this application;

[0022] Figure 3 A top view of an oil collection device provided in another embodiment of this application;

[0023] Figure 4 A front view of an installation component provided in an embodiment of this application;

[0024] Figure 5 This is a diagram showing the usage state of an oil collection device provided in an embodiment of this application.

[0025] Figure label:

[0026] 10-Oil collection device;

[0027] 100 - Collection box; 110 - First side wall; 111 - Opening; 120 - Second side wall; 121 - Long groove; 130 - Third side wall; 140 - Fourth side wall; 150 - Scraper; 160 - Observation window; 170 - Lower guard plate; 180 - Slide rail; 190 - Protrusion;

[0028] 200-Fixed rod;

[0029] 300 - Mounting component; 310 - Mounting frame; 311 - First mounting sidewall; 312 - Second mounting sidewall; 313 - Connecting wall; 314 - Mounting wall; 315 - Locking pin; 320 - Abutment part; 321 - First connecting rod; 322 - Second connecting rod; 323 - Mounting shaft; 324 - Roller;

[0030] 20 - Yaw bearing; 21 - First bolt; 22 - Second bolt;

[0031] 30-Yaw brake disc;

[0032] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0034] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] As described in the background section, grease seeping from the yaw bearing cavity in the yaw system of the related technology can easily fall onto the yaw brake disc below, thereby weakening or failing the braking performance of the yaw system and affecting the stability of the wind turbine generator operation.

[0036] In view of the above, this application aims to provide an grease collection device, a yaw system, and a wind turbine generator set. The grease collection device includes a collection box, which includes a first sidewall and a second sidewall perpendicular to a first direction and arranged opposite to each other, and a third sidewall and a fourth sidewall perpendicular to a second direction and arranged opposite to each other. The first sidewall, the third sidewall, the second sidewall, and the fourth sidewall are connected end to end in sequence. The first sidewall and the second sidewall are respectively used to abut against a first bolt and a second bolt. The first sidewall has an opening at one end near the third sidewall. The third sidewall has a scraper facing the first sidewall. In the first direction, the first end of the scraper is located outside the third sidewall, and the thickness of the first end of the scraper gradually decreases in the direction away from the second sidewall. The first direction and the second direction are perpendicular to each other. The grease collection device of this application can be snapped between the first and second bolts on the yaw bearing during use. When the yaw bearing rotates from the second bolt to the first bolt, the scraper can scrape off the grease that seeps out of the inner cavity of the yaw bearing, so that the grease falls into the collection box through the opening and is collected, reducing the probability of grease leakage onto the yaw brake disc, ensuring that the yaw system has good braking performance, and improving the stability of the wind turbine generator operation.

[0037] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can gain a more detailed understanding of the contents of this application.

[0038] Figure 1 A simplified structural diagram of an oil collection device provided in an embodiment of this application; Figure 2 This is a side view of an oil collection device provided in an embodiment of this application; Figure 3 A top view of an oil collection device provided in another embodiment of this application; Figure 4 A front view of an installation component provided in an embodiment of this application;

[0039] Figure 5 This is a diagram illustrating the usage state of an oil collection device provided in an embodiment of this application. It should be noted that in this embodiment, the first direction X, the second direction Y, and the third direction Z are three different directions that are perpendicular to each other in three-dimensional space.

[0040] Please refer to Figures 1-5This embodiment provides a grease collection device 10 for installation on a yaw bearing 20. The yaw bearing 20 has multiple bearing bolts, one of two adjacent bearing bolts is a first bolt 21, and the other is a second bolt 22. The yaw bearing 20 rotates from the second bolt 22 toward the first bolt 21. The grease collection device 10 includes a collection box 100, which in this embodiment is generally rectangular. The collection box 100 includes a first sidewall 110 and a second sidewall 120 perpendicular to the first direction X and arranged opposite to each other, and a third sidewall 130 and a fourth sidewall 140 perpendicular to the second direction Y and arranged opposite to each other. The first sidewall 110, the third sidewall 130, the second sidewall 120 and the fourth sidewall 140 are connected end to end. The first sidewall 110 and the second sidewall 120 are respectively used to abut against the first bolt 21 and the second bolt 22. The first sidewall 110 has an opening 111 at one end near the third sidewall 130. The third sidewall 130 is provided with a scraper 150 facing the first sidewall 110. In the first direction X, the first end of the scraper 150 is located outside the third sidewall 130, thereby facilitating the scraping of grease from the inner cavity of the yaw bearing 20. The thickness of the first end of the scraper 150 gradually decreases in the direction away from the second sidewall 120 to increase the stress when the scraper 150 contacts the yaw bearing 20, which is beneficial for scraping off the grease. In this embodiment, the scraper 150 is detachably mounted on the third side wall 130, which facilitates installation and replacement.

[0041] In this embodiment, the grease collection device 10 can be engaged between the adjacent first bolt 21 and second bolt 22 on the yaw bearing 20. When the yaw bearing 20 rotates from the second bolt 22 to the first bolt 21, the scraper 150 can scrape off the grease seeping from the inner cavity of the yaw bearing 20, so that the grease falls into the collection box 100 through the opening 111 for collection, reducing the probability of grease leakage onto the yaw brake disc 30, ensuring that the yaw system has good braking performance, and improving the stability of the wind turbine generator operation.

[0042] In one possible implementation, in the second direction Y, the size of the collection box 100 of this embodiment gradually increases from the third side wall 130 to the fourth side wall 140. With the above structure, it is beneficial for the grease entering the collection box 100 to flow towards the fourth side wall 140.

[0043] Optionally, an observation window 160 is provided on the fourth sidewall 140 of this embodiment to allow staff to observe the amount of grease in the collection box 100 in real time. A lower protective plate 170 is also fitted onto the outer side of the collection box 100. The shape of the lower protective plate 170 is adapted to the shape of the collection box 100, and the lower protective plate 170 is located on the side opposite to the third sidewall 130. The lower protective plate 170 can also be cuboid, for example, and can replace the collection box 100 in contact with the yaw brake disc 30, thereby helping to extend the service life of the collection box 100. Optionally, protrusions 190 can be provided on both the first sidewall 110 and the second sidewall 120, and grooves are provided on the opposite sidewalls of the lower protective plate 170. The protrusions 190 are inserted into the grooves to fix the lower protective plate 170 to the first sidewall 110 and the second sidewall 120, facilitating the installation of the lower protective plate 170.

[0044] In one possible implementation, a fixing rod 200 is detachably connected to the second sidewall 120 of this embodiment, with one end of the fixing rod 200 facing away from the second sidewall 120 abutting against the second bolt 22. The length of the fixing rod 200 can be selected as needed, thereby enabling the grease collection device 10 of this embodiment to be applicable to different types of wind turbine generator sets.

[0045] Optionally, the second sidewall 120 of this embodiment is provided with an elongated groove 121 extending along the second direction Y. The fixing rod 200 is detachably installed in the elongated groove 121 by fasteners, such as bolts, nuts and other parts. The fixing rod 200 can be moved in the elongated groove 121 before installation to determine a suitable fastening position.

[0046] In one possible implementation, this embodiment further includes a mounting component 300, which includes a mounting frame 310. The mounting frame 310 includes a first mounting sidewall 311 and a second mounting sidewall 312 perpendicular to the first direction X and arranged opposite to each other, and a connecting wall 313 and a mounting wall 314 perpendicular to the second direction Y and arranged opposite to each other. The two ends of the connecting wall 313 are respectively connected to the first mounting sidewall 311 and the second mounting sidewall 312. The mounting wall 314 is provided with a passage opening through which the collection box 100 passes and is installed inside the mounting component 300. The portions of the first sidewall 110 and the second sidewall 120 facing away from the third sidewall 130 are slidably connected to the first mounting sidewall 311 and the second mounting sidewall 312, respectively. With the above structure, the extension length of the collection box 100 in the second direction Y can be adjusted, thereby enabling the collection box 100 to be adapted to different types of wind turbine generator sets.

[0047] Optionally, in this embodiment, the first sidewall 110 and the first mounting sidewall 311, as well as the second sidewall 120 and the second mounting sidewall 312, are connected by a slide rail and slide groove structure. For example, slide rails 180 can be provided on both the first sidewall 110 and the second sidewall 120, and slide grooves can be provided on both the first mounting sidewall 311 and the second mounting sidewall 312, so that the two are slidably connected by the slide rail and slide groove structure. Furthermore, a matching locking pin 315 can also be provided to fix the first sidewall 110 to the first mounting sidewall 311 and the second sidewall 120 to the second mounting sidewall 312 after the collection box 100 slides into place.

[0048] Furthermore, the mounting component 300 in this embodiment also includes an abutment portion 320, which is disposed below the mounting frame 310 along a third direction Z. The abutment portion 320 includes a first connecting rod 321, a second connecting rod 322, a mounting shaft 323, and a roller 324. The first connecting rod 321 and the mounting shaft 323 are disposed along a third direction Z. One end of the first connecting rod 321 is connected to the mounting frame 310, and the other end of the first connecting rod 321 is connected to the second connecting rod 322. The mounting shaft 323 is disposed at the end of the second connecting rod 322 opposite to the first connecting rod 321. The roller 324 is sleeved on the mounting shaft 323 and is located on the side of the second connecting rod 322 facing the mounting frame 310. The above structure can effectively prevent the roller 324 from falling off. In use, the abutment portion 320 of this embodiment can abut against the yaw brake disc 30 and can roll along the yaw brake disc 30 to provide support for the collection box 100.

[0049] This embodiment also provides a yaw system, including a yaw bearing 20, which is mounted above the yaw brake disc 30. The yaw bearing 20 is provided with a plurality of bearing bolts, one of two adjacent bearing bolts being a first bolt 21 and the other being a second bolt 22. The yaw bearing 20 rotates from the second bolt 22 toward the first bolt 21. The first bolt 21 and the second bolt 22 are provided with the grease collection device 10 as described above.

[0050] When the yaw system of this embodiment rotates, the scraper 150 can scrape off the grease that seeps out of the inner cavity of the yaw bearing 20, so that the grease falls into the collection box 100 through the opening 111 and is collected, reducing the probability of grease leaking onto the yaw brake disc 30, ensuring that the yaw system has good braking performance, and improving the stability of the wind turbine generator operation.

[0051] This embodiment also provides a wind turbine generator set, including the yaw system described above.

[0052] Because the wind turbine generator set in this embodiment is equipped with the aforementioned yaw system, it can collect the grease seeping from the inner cavity of the yaw bearing, reducing the probability of grease leaking onto the yaw brake disc, ensuring that the yaw system has good braking performance, and improving the operational stability of the wind turbine generator set.

[0053] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] It should be noted that in the description of this application, the terms "first" and "second" are used only for convenience in describing different components and should not be construed as indicating or implying a sequential relationship, relative importance, or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features.

[0056] The embodiments or implementation methods in this application are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0057] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A grease collecting device for mounting on a yaw bearing, the yaw bearing being provided with a plurality of bearing bolts, one of two adjacent bearing bolts being a first bolt and the other being a second bolt, the yaw bearing being turned from the second bolt to the first bolt side, characterized in that, The collecting box comprises a first side wall and a second side wall arranged opposite to each other perpendicularly to a first direction, a third side wall and a fourth side wall arranged opposite to each other perpendicularly to a second direction, the first side wall, the third side wall, the second side wall and the fourth side wall are sequentially connected end to end, the first side wall and the second side wall are arranged to abut against the first bolt and the second bolt respectively, an opening is arranged on one end of the first side wall close to the third side wall, a scraper is arranged on the third side wall towards the first side wall, in the first direction, a first end of the scraper is located outside the third side wall, and the thickness of the first end of the scraper gradually decreases in a direction away from the second side wall. The first direction and the second direction are perpendicular to each other. A fixing rod is detachably connected to the second side wall, and one end of the fixing rod away from the second side wall is arranged to abut against the second bolt. A long slot extending along the second direction is arranged on the second side wall, and the fixing rod is detachably mounted in the long slot through a fastener. The mounting member comprises a mounting frame, the mounting frame comprises a first mounting side wall and a second mounting side wall arranged opposite to each other perpendicularly to the first direction, and a connecting wall and a mounting wall arranged opposite to each other perpendicularly to the second direction, two ends of the connecting wall are connected to the first mounting side wall and the second mounting side wall respectively, and a through hole is arranged on the mounting wall, the collecting box is mounted in the mounting member after passing through the through hole, and the part of the first side wall away from the third side wall and the part of the second side wall away from the third side wall are slidably connected to the first mounting side wall and the second mounting side wall respectively.

2. The oil collection device according to claim 1, characterized by An observation window is arranged on the fourth side wall, and a lower guard plate is further arranged on the outside of the collecting box, the shape of the lower guard plate is matched with the shape of the collecting box, and the lower guard plate is located on the side away from the third side wall.

3. The oil collection device according to claim 2, characterized by Protruding parts for fixing the lower guard plate are arranged on the first side wall and the second side wall, sliding grooves are arranged on the opposite two side walls of the lower guard plate, and the protruding parts are inserted into the sliding grooves to fixedly connect the lower guard plate with the first side wall and the second side wall.

4. The oil collection device according to any one of claims 1 to 3, characterized in that, The first side wall and the first mounting side wall, and the second side wall and the second mounting side wall are connected through a sliding rail and sliding groove structure.

5. The oil collection device according to any one of claims 1 to 3, characterized in that, The mounting member further comprises an abutting part arranged below the mounting frame along a third direction, the abutting part comprises a first connecting rod, a second connecting rod, a mounting shaft and a roller, the first connecting rod and the mounting shaft are arranged along the third direction, one end of the first connecting rod is connected to the mounting frame, the other end of the first connecting rod is connected to the second connecting rod, the mounting shaft is arranged on one end of the second connecting rod away from the first connecting rod, and the roller is sleeved on the mounting shaft and located on the side of the second connecting rod towards the mounting frame. The first direction, the second direction and the third direction are perpendicular to each other.

6. A yaw system characterized in that The yaw bearing comprises a plurality of bearing bolts, one of the two adjacent bearing bolts is a first bolt and the other is a second bolt, the yaw bearing rotates from the second bolt to the first bolt, and the first bolt and the second bolt are provided with the grease collecting device as claimed in any one of claims 1-5.

7. A wind power unit, characterized in that The yaw system comprises the yaw bearing as claimed in claim 6.

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