Bearing split-flow lubricating structure for mounting generator shaft
By incorporating oil slingers and labyrinth seals into the wind turbine bearings, the problem of grease leakage was solved, resulting in effective lubrication, reduced failure rates, and extended bearing lifespan.
Patent Information
- Application Number
- CN202511752596.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2025-12-30
AI Technical Summary
Existing wind turbine bearing lubrication technology suffers from problems such as long grease paths, high oil resistance, and severe leakage, resulting in a high bearing failure rate and failing to meet the requirements for long-term stable operation.
A bearing flow distribution lubrication structure is designed. By setting oil slinger grooves and grease chambers on the bearing retaining ring, the grease is effectively distributed and leakage is reduced. An arc-shaped oil slinger groove and a labyrinth seal structure are used to reduce grease leakage.
This achieves effective lubrication of the bearings, reduces grease leakage, lowers the failure rate, extends the bearing's service life, and improves the reliability of the wind turbine.
Smart Images
Figure CN121229344A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of wind driven generators, and particularly relates to a bearing shunt lubrication structure for installing a generator shaft. BACKGROUND
[0002] Since most wind driven generators are installed and operated in the wild or on the sea, the temperature, humidity and load are dynamically changing at any time, and the working conditions are very harsh. For the generator located in the cabin, in addition to being subjected to the above complex working conditions, the generator drive end is higher than the non-drive end due to the need to tilt the blades at a safety angle, so the generator shaft is often in a tilted state. At present, the onshore unit mainly adopts the double-fed generator route, and the double-fed generator adopts a two-column ball bearing shaft structure, that is, a ball bearing and a column bearing combined structure are adopted at the drive end of the generator, which can not only bear the radial load but also bear the axial load. For the lubrication of the bearing, one kind is to inject lubricating grease from the injection hole position of the bearing inner cover, pass through the two bearings in turn, and then be thrown out from the grease discharge hole on the bearing outer cover, and the other kind of lubrication technology is to inject lubricating grease from the injection hole positions of the bearing inner cover and the bearing outer cover respectively, then pass through the two bearings respectively, and then be thrown out from the grease discharge hole on the spacer block between the bearings.
[0003] The above first lubrication technology has a long path and large oil resistance because the grease needs to pass through the two bearings once before being discharged, which leads to insufficient lubrication of the bearing and high failure rate. At the same time, since the grease needs to be injected from the injection hole position of the bearing inner cover, the oil pressure at the oil chamber of the bearing inner cover is high, and the oil chamber of the bearing inner cover is at the low position of the entire oil circuit after the blade of the unit is tilted. Under the joint action of its own gravity and high oil pressure, the grease seeps into the motor, and the seeped grease will pollute the end winding and cause the motor to malfunction. At the same time, the seeped grease will lead to insufficient lubrication of the bearing, which cannot meet the requirement of sufficient lubrication of the bearing, thereby accelerating the wear and over-temperature failure of the bearing and reducing the service life of the bearing. The above second lubrication technology effectively solves the defects of long path and large oil resistance compared with the first lubrication technology, so that the two bearings can be effectively lubricated. However, since the oil pressure at the oil chamber of the bearing inner cover is high, and the oil chamber of the bearing inner cover is at the low position of the entire oil circuit after the blade of the unit is tilted, the grease is still easy to seep into the motor under the joint action of its own gravity and high oil pressure.
[0004] Therefore, in order to solve the above problems, a bearing shunt lubrication structure for installing a generator shaft is needed. SUMMARY
[0005] The bearing shunt lubrication structure for installing the generator shaft can ensure effective lubrication of the bearing set through the setting of the lubricating grease chamber, and can effectively throw out the lubricating grease at the position of the retaining ring and rebound into the lubricating grease chamber through the oil throwing groove structure formed on the bearing retaining ring, thereby reducing the occurrence of lubricating grease leakage into the generator shaft.
[0006] The technical scheme for solving the above technical problems is as follows: A bearing shunt lubrication structure for installing a generator shaft, comprising a bearing sleeve assembly sleeved on the generator shaft, a bearing set sleeved on the generator shaft and matched with the bearing sleeve assembly, a bearing outer cover abutting against the bearing set, and a bearing inner cover; a lubricating grease chamber is formed between the bearing sleeve assembly, the bearing outer cover, the bearing inner cover, and the generator shaft, a bearing retaining ring is installed between the bearing inner cover and the bearing set, and an oil throwing groove for rebounding lubricating grease into the lubricating grease chamber is formed on the bearing retaining ring.
[0007] Further, the end of the bearing retaining ring is pressed against the bearing set, the bearing retaining ring comprises a retaining ring body, a first ring body formed on the retaining ring body, and a second ring body; the oil throwing groove is formed on the first ring body.
[0008] Further, the cross section of the oil throwing groove along the axial direction of the retaining ring body is in an arc structure, the oil throwing groove is a plurality of and the plurality of oil throwing grooves are uniformly distributed along the circumferential direction of the first ring body.
[0009] Further, the first ring body and the retaining ring body form an inclined angle B in the axial direction, and the inclined angle B is 1-3°.
[0010] Further, the end of the bearing inner cover is pressed against the bearing set and the bearing sleeve assembly, the bearing inner cover is protruded in the axial direction of the retaining ring body to form an inner cover retaining ring, and the inner cover retaining ring is a plurality of and the plurality of inner cover retaining rings are arranged in parallel.
[0011] Further, the inner cover retaining ring comprises an outer retaining ring, a middle retaining ring, and an inner retaining ring which are sequentially distributed inwardly in the radial direction of the bearing inner cover, the second ring body is arranged between the inner retaining ring and the middle retaining ring, and the first ring body is arranged between the outer retaining ring and the middle retaining ring.
[0012] Further, an arc convex surface of the retaining ring is formed on the inner end of the outer retaining ring.
[0013] Further, the bearing sleeve assembly comprises a bearing sleeve for installing the bearing set and a grease injection block, and the bearing sleeve, the grease injection block, the bearing inner cover, and the bearing outer cover form a lubricating grease channel for lubricating grease injection and discharge in cooperation with the lubricating grease chamber.
[0014] Furthermore, the bearing assembly includes a first bearing and a second bearing, the grease block presses the first bearing against the generator shaft, and the bearing sleeve presses the second bearing against the generator shaft.
[0015] Furthermore, a spacer ring is arranged between the first bearing and the second bearing, and the spacer ring is sleeved on the generator shaft.
[0016] The beneficial effects of this technical solution are: The bearing distribution lubrication structure for mounting the generator shaft in this technical solution ensures effective lubrication of the bearing assembly through the setting of the grease chamber. The oil-throwing groove structure formed on the bearing retaining ring can effectively throw out the grease at the retaining ring position and bounce it back into the grease chamber, reducing the occurrence of grease leakage into the generator shaft. Attached Figure Description
[0017] Figure 1 This is a schematic cross-sectional view of the overall installation of the present invention; Figure 2 This is a schematic diagram of the grease channel of the present invention (the arrow indicates the direction of grease flow). Figure 3 This is a schematic diagram of the bearing retaining ring installation according to the present invention; Figure 4 This is a schematic diagram of the bearing retaining ring structure of the present invention; Figure 5 This is a schematic diagram of the side of the bearing retaining ring of the present invention; Figure 6 for Figure 5 Sectional view of AA; Figure 7 This is a schematic diagram of the tilting of the first ring body of the present invention.
[0018] The attached diagram lists the components represented by each number as follows: 1-Generator shaft; 2-Locking nut; 3-Outer cover grease drain chamber; 4-First bearing; 5-Bearing outer cover; 6-Grease block; 7-Grease hole; 8-Grease inlet channel; 9-Inner grease inlet hole; 10-Bearing sleeve; 11-Bearing inner cover; 12-Spacer retaining ring; 13-Second bearing; 14-Inner cover grease drain chamber; 15-Bearing retaining ring; 16-Inner cover grease drain hole; 17-Grease reservoir; 18-Grease drain channel; 19-Grease drain hole; 20-Oil slinger groove; 21-Outer retaining ring; 22-First ring body; 23-Second ring body; 24-Middle retaining ring; 25-Inner retaining ring; 151-Retaining ring body. Detailed Implementation
[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.
[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0023] like Figures 1 to 4 As shown in the embodiment of this application, a bearing distribution lubrication structure for mounting a generator shaft includes a bearing sleeve assembly fitted over the generator shaft 1, a bearing assembly fitted over the generator shaft 1 and installed in conjunction with the bearing sleeve assembly, an outer bearing cover 5 and an inner bearing cover 11 pressed against the bearing assembly; a grease chamber is formed between the bearing sleeve assembly, the outer bearing cover 5, the inner bearing cover 11 and the generator shaft 1, and a bearing retaining ring 15 is installed between the inner bearing cover 11 and the bearing assembly, and an oil slinger groove 20 is formed on the bearing retaining ring 15 for throwing grease back into the grease chamber.
[0024] like Figure 1 and Figure 2As shown, the grease chamber includes an outer cover grease discharge chamber 3, an inner cover grease discharge chamber 14, and a grease reservoir 17 connecting the two. The three chambers are connected, and a grease channel is formed on the bearing sleeve assembly. When grease is injected into the grease reservoir 17, the grease reservoir 17 is a high-pressure chamber. The grease flows through the grease reservoir 17, lubricates the bearings on both sides, and then flows to the outer cover grease discharge chamber 3 and the inner cover grease discharge chamber 14. At this time, the outer cover grease discharge chamber 3 and the inner cover grease discharge chamber 14 are relatively low-pressure chambers, reducing the risk of grease leakage (the left end of the generator shaft 1 is slightly higher than the right end, with a certain degree of inclination). The bearing diversion lubrication structure for installing the generator shaft in this technical solution can ensure effective lubrication of the bearing assembly through the setting of the grease chamber. Through the oil slinger groove 20 structure formed on the bearing retainer ring 15, the grease at the retainer ring position can be effectively thrown out and bounced back into the grease chamber (mainly the inner cover grease discharge chamber 14), reducing the occurrence of grease leakage into the generator shaft 1.
[0025] In this embodiment, the end of the bearing retaining ring 15 is pressed against the bearing assembly. The bearing retaining ring 15 includes a retaining ring body 151, a first ring body 22 and a second ring body 23 formed on the retaining ring body 151; an oil slinger groove 20 is formed on the first ring body 22.
[0026] like Figure 3 and Figure 4 As shown, the bearing retaining ring 15 is mainly made of three parts integrally formed, including the retaining ring body 151, and the left end face of the retaining ring body 151 is pressed against the bearing assembly, and the retaining ring body 151 is sleeved on the generator shaft 1. The retaining ring body 151 has a first ring body 22 and a second ring body 23 protruding from it, and the end of the first ring body 22 is machined to form an oil throwing groove 20, which is used to help to throw the internal grease away and bounce it back into the grease chamber, thereby reducing the overflow of grease from the gap between the first ring body 22 and the bearing inner cover 11.
[0027] In this embodiment, the oil slinger 20 has an arc-shaped cross-section along the axial direction of the retaining ring body 151, and there are multiple oil slingers 20, which are evenly distributed along the circumferential direction of the first ring body 22.
[0028] like Figures 3 to 6 As shown, the oil slinger 20 is located at the inner end of the first annular body 22 (i.e., Figure 3 The left end is the inner end and the right end is the outer end, and they are evenly arranged along the circumference of the first ring body 22. The oil slinger 20 is set as an arc-shaped structure, so that when the grease comes into contact with the position of the oil slinger 20 during the rotation of the overall structure, it can better form an upward arc and throw the grease. This makes it easier for the grease to have a better throwing height and reduces the flow of grease into the gap between the first ring body 22 and the bearing inner cover 11.
[0029] In this embodiment, the first ring body 22 and the retaining ring body 151 form an inclined angle B in the axial direction, and the inclined angle B is 1-3°.
[0030] like Figure 7 As shown, the first ring body 22 is perpendicular to the axial direction (i.e., Figure 7 The inclined angle B is formed in the horizontal direction. The preferred inclined angle B is 2°. Since the left end of the generator shaft is installed slightly inclined upward, the first ring body 22 is inclined upward at a certain angle so that it has a certain position compensation effect after installation. This makes it more difficult for the grease to pass through the gap between the first ring body 22 and the bearing inner cover 11, and has a better blocking effect on the leakage of grease. Of course, the first ring body 22 adopts this design, which also makes the oil throwing groove 20 form a better oil throwing effect.
[0031] In this embodiment, the end of the bearing inner cover 11 is pressed against the bearing assembly and the bearing sleeve assembly. The bearing inner cover 11 protrudes along the axial direction of the retaining ring body 151 to form an inner cover retaining ring. There are multiple inner cover retaining rings, and the multiple inner cover retaining rings are arranged in parallel with each other.
[0032] like Figure 1 As shown, the outer end of the bearing inner cover 11 is pressed against the bearing assembly and bearing sleeve assembly, while the inner end protrudes in the axial direction to form an inner cover retaining ring structure. Multiple inner cover retaining ring structures are arranged in parallel to each other, and together with the bearing retaining ring 15, they form an effective sealing structure to reduce the leakage of grease.
[0033] In this embodiment, the inner cover retaining ring includes an outer retaining ring 21, a middle retaining ring 24 and an inner retaining ring 25 distributed sequentially inward along the radial direction of the bearing inner cover, a second ring body 23 is arranged between the inner retaining ring 25 and the middle retaining ring 24, and a first ring body 22 is arranged between the outer retaining ring 24 and the middle retaining ring 24.
[0034] like Figures 1 to 3 As shown, the outer retaining ring 21, the middle retaining ring 24, and the inner retaining ring 25 are arranged in a radial direction inward. The three retaining rings are respectively fitted with the two ring bodies with clearance fit. After installation, a continuously bent labyrinth structure is formed, which creates an effective sealing effect and reduces the leakage of internal grease.
[0035] In this embodiment, an arc-shaped convex surface is formed on the inner end of the outer retaining ring 21.
[0036] like Figure 3As shown, an arc-shaped convex surface structure is formed on the inner surface of the outer retaining ring 21, and the lower end of the arc-shaped convex surface extends close to the upper end of the oil slinger groove 20 of the arc-shaped structure. This allows the grease that has passed through the oil slinger groove 20 to smoothly enter the arc-shaped convex surface of the outer retaining ring 21 after being thrown out, and continue to form an upward throwing effect, making its overall throwing effect better and reducing the situation where grease flows out from the gap during rotation.
[0037] In this embodiment, the bearing sleeve assembly includes a bearing sleeve 10 for mounting the bearing assembly and a grease block 6. The bearing sleeve 10, the grease block 6, the inner bearing cover 11, and the outer bearing cover 5 form a grease channel (including an inlet channel and an outlet channel) that cooperates with the grease chamber for grease injection and discharge.
[0038] like Figure 1 and Figure 2 As shown, the bearing sleeve assembly includes a bearing sleeve 10 and a grease injection block 6. The grease injection block 6 has a grease injection hole 7 and a grease inlet channel 8. The bearing sleeve 10 and the grease injection block 6 also form an inner grease inlet hole 9. The grease injection hole 7, the grease inlet channel 8, and the inner grease inlet hole 9 form a complete inlet channel, which facilitates the injection of lubricating grease from the outside. At the same time, the bearing sleeve 10 and the grease injection block 6 are also provided with a grease discharge channel 18. The bearing inner cover 11 has an inner cover grease discharge hole 16, and the bearing outer cover has a grease discharge hole 19. The inner cover grease discharge hole 16, the grease discharge channel 18, and the grease discharge hole 19 are combined to form a discharge channel. After the lubricating grease is lubricated by the bearing, it can be discharged through the corresponding channel.
[0039] In this embodiment, the bearing assembly includes a first bearing 4 and a second bearing 13. The grease block 6 presses the first bearing 4 against the generator shaft 1, and the bearing sleeve 10 presses the second bearing 13 against the generator shaft 1.
[0040] like Figure 1 As shown, the first bearing 4 and the second bearing 13 are different types of bearings to meet the installation and use requirements of the generator shaft 1. The first bearing 4 and the second bearing 13 are both sleeved on the generator shaft 1. The bearings are installed by corresponding grease blocks 6 and bearing sleeves 10. The end faces of the two bearings are respectively fitted with bearing outer covers 5 and bearing inner covers 11 to ensure the stability of the overall structure.
[0041] In this embodiment, a spacer ring 12 is arranged between the first bearing 4 and the second bearing 13, and the spacer ring 12 is sleeved on the generator shaft 1.
[0042] like Figure 1 Figure 1As shown, the spacer ring 12 is sleeved on the generator shaft 1 and serves to space the two bearings for installation. Correspondingly, a locking nut 2 is also sleeved on the generator shaft to lock the first bearing 4 in place, ensuring that the overall structure is installed stably and reliably.
[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A bearing split flow lubrication arrangement for mounting a generator shaft, characterized by: The bearing cover (11) and the bearing set are provided with a bearing baffle ring (15), and the bearing baffle ring (15) is provided with a oil throwing groove (20) for throwing the lubricating grease back into the lubricating grease chamber.
2. The bearing split-flow lubrication structure for mounting a generator shaft according to claim 1, characterized by: The end of the bearing baffle ring (15) is pressed against the bearing set, the bearing baffle ring (15) comprises a baffle ring body (151), a first ring body (22) and a second ring body (23) formed on the baffle ring body (151), and the oil throwing groove (20) is formed on the first ring body (22).
3. The bearing split-flow lubrication structure for mounting a generator shaft according to claim 2, characterized by: The oil throwing groove (20) is in an arc structure in the axial direction of the baffle ring body (151), and a plurality of oil throwing grooves (20) are uniformly distributed in the circumferential direction of the first ring body (22).
4. The bearing split-flow lubrication structure for mounting a generator shaft according to claim 2, characterized by: The first ring body (22) and the baffle ring body (151) form an inclined angle B in the axial direction, and the inclined angle B is 1-3°.
5. The bearing split flow lubrication arrangement for mounting a generator shaft according to claim 2, characterized in that: The end of the bearing inner cover (11) is pressed against the bearing set and the bearing sleeve assembly, and the bearing inner cover (11) is provided with an inner cover baffle ring in the axial direction of the baffle ring body (151), and the plurality of inner cover baffle rings are arranged in parallel.
6. The bearing split-flow lubrication structure for mounting a generator shaft according to claim 5, characterized by: The inner cover baffle ring comprises an outer baffle ring (24), a middle baffle ring (24) and an inner baffle ring (25) distributed in the radial direction of the bearing inner cover (11) in sequence, the second ring body (23) is arranged between the inner baffle ring (25) and the middle baffle ring (24), and the first ring body (22) is arranged between the outer baffle ring (21) and the middle baffle ring (24).
7. The bearing split-flow lubrication structure for mounting a generator shaft according to claim 6, characterized by: The inner end of the outer baffle ring (21) is provided with a baffle ring arc convex surface.
8. The bearing split-flow lubrication structure for mounting a generator shaft according to claim 1, characterized by: The bearing sleeve assembly comprises a bearing sleeve (10) for mounting the bearing set and a grease injection block (6), and the bearing sleeve (10), the grease injection block (6), the bearing inner cover (11) and the bearing outer cover (5) form a lubricating grease channel for injecting and discharging the lubricating grease in the lubricating grease chamber.
9. The bearing partial flow lubrication structure for mounting a generator shaft according to claim 8, characterized by: The bearing set comprises a first bearing (4) and a second bearing (13), the grease injection block (6) presses the first bearing (4) against the generator shaft (1), and the bearing sleeve (10) presses the second bearing (13) against the generator shaft (1).
10. The bearing partial flow lubrication structure for mounting a generator shaft according to claim 9, characterized by: The first bearing (4) and the second bearing (13) are provided with a spacing baffle ring (12), and the spacing baffle ring (12) is sleeved on the generator shaft (1).