Integrated sliding main bearing system and maintenance method thereof

Abstract

The invention discloses an integrated sliding main bearing system and a maintenance method thereof. The integrated sliding main bearing system comprises a main shaft, a bearing seat, a radial bearing assembly, an axial sliding assembly and a gearbox. The main shaft is arranged in an inner cavity of the bearing seat in a penetrating mode, the input end of the gearbox is connected with the main shaft and the bearing seat, and the output end of the gearbox is connected to the generator. The radial bearing assemblies are detachably arranged on the front side and the rear side of an inner cavity of the bearing seat correspondingly and used for supporting the main shaft for torque transmission and radial limiting. And the axial sliding assembly is detachably arranged at the front end of the bearing seat and is used for axially limiting the main shaft. The supporting unit has the advantages of being compact in structure, convenient to disassemble and assemble, high in maintenance efficiency and the like, the main bearing, the thrust bearing and the gear box are integrated in the compact supporting unit, independent supporting points are reduced, the shafting length is shortened, and the bottleneck of ultra-large megawatt unit bearing design is broken.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment technology, specifically to an integrated sliding main bearing system and its maintenance method. Background Technology

[0002] Currently, technological bottlenecks in the scaling up of wind turbine units are becoming increasingly apparent, particularly in core transmission components. The main bearing system, as the central hub of energy transmission, experiences non-linear growth in its geometric dimensions, overall weight, and manufacturing costs. When the diameter of the rolling bearing supporting the wind turbine's main shaft exceeds the 6m threshold, material consumption, processing precision requirements, and assembly difficulty increase exponentially. Addressing the technological limitations of rolling bearings in ultra-high-power units, the industry's technological approach is shifting towards sliding bearing solutions. Compared to traditional rolling bearings, sliding bearings, with their superior load distribution characteristics, excellent impact load bearing capacity, and higher power density, are becoming a key technological breakthrough direction for the next generation of large-megawatt wind turbines. However, the industrial application of this technology still requires overcoming several engineering challenges.

[0003] In existing sliding bearing systems of wind turbine drive trains, the bending moment experienced by the bearing bushes leads to uneven deformation of the radial bearing bush mating surfaces, significantly impacting oil film formation and drastically shortening the bearing's service life. Furthermore, the radial and thrust bearing bushes are located together at the hub end, and due to the basic functions and structure of the wind turbine, lubrication, maintenance, and replacement of these bushes are difficult to achieve. Specifically, axial bearing bushes behind the sliding bearings are difficult to maintain, requiring gearbox disassembly, which is technically challenging; the radial bearing bushes also have a complex design and are difficult to maintain. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of existing sliding bearings in terms of maintenance difficulties, and to provide an integrated sliding main bearing system and its maintenance method that is compact in structure, easy to disassemble and assemble, and conducive to improving maintenance efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An integrated sliding main bearing system includes: a main shaft, a bearing housing, a radial load-bearing assembly, an axial sliding assembly, and a gearbox; the main shaft passes through the inner cavity of the bearing housing, the input end of the gearbox is connected to the main shaft and the bearing housing respectively, and the output end of the gearbox is connected to a generator; The radial bearing components are detachably installed on the front and rear sides of the bearing housing cavity to support the spindle torque transmission and radial limit. The axial sliding assembly is detachably mounted at the front end of the bearing housing for axial positioning of the spindle.

[0006] As a further improvement of the present invention, the radial bearing assembly includes a front radial bearing and a rear radial bearing; the front radial bearing is disposed at the front of the bearing housing cavity, and the rear radial bearing is disposed at the rear of the bearing housing cavity.

[0007] As a further improvement of the present invention, the outer periphery of the bearing housing is provided with a plurality of maintenance holes evenly distributed along the axial direction, and the rear radial bearing bush is disassembled and installed in the rear part of the bearing housing cavity through the maintenance holes.

[0008] As a further improvement of the present invention, the axial sliding assembly includes an axial thrust plate, a first axial bearing shell, a second axial bearing shell, and a baffle; at the front end of the bearing housing, the second axial bearing shell, the axial thrust plate, the first axial bearing shell, and the baffle are arranged sequentially from the inside to the outside, the axial thrust plate is fixed circumferentially to the outer periphery of the main shaft, and the first axial bearing shell, the second axial bearing shell, and the baffle are all fixed to the end of the bearing housing.

[0009] As a further improvement of the present invention, the upper part of the baffle is provided with multiple through holes arranged side by side, and the front end of the bearing seat is provided with multiple sets of threaded holes evenly distributed along the circumference. Studs are screwed into the through holes and threaded holes, and the studs are locked by nuts to achieve connection and fixation between the baffle and the bearing seat.

[0010] As a further improvement of the present invention, an annular boss is provided on the lower inner side of the baffle, and a second annular groove is provided on the first axial bearing. The second annular groove is nested on the annular boss to fix the first axial bearing to the inner side of the baffle.

[0011] As a further improvement of the present invention, the front end of the bearing housing is provided with multiple sets of first annular grooves evenly distributed along the circumference, and the first annular grooves are used to install the second axial bearing bush.

[0012] As a further improvement of the present invention, the axial thrust plate is a fan-shaped component, and the axial thrust plate is fixed to the outer periphery of the main shaft by bolts.

[0013] As a general technical concept, the present invention also provides a maintenance method applicable to the above-mentioned integrated sliding main bearing system, comprising the steps of replacing the front radial bearing shell, axial thrust plate, first axial bearing shell, second axial bearing shell, and baffle: Step S1: Remove the sealing device from the front of the bearing housing; Step S2: Remove the nuts from the fixing baffle, and after removing the baffle, remove the first axial bearing. Step S3: Remove the bolts between the axial thrust plate and the spindle, and remove the axial thrust plate; Step S4: Remove the second axial bearing and the front radial bearing; Step S5: Install the newly replaced front radial bearing, second axial bearing, axial thrust plate, first axial bearing, and baffle in sequence.

[0014] As a further improvement to the present invention, the step of replacing the rear radial bearing is also included: Step Y1: Remove the cover plate of the maintenance hole on the side of the bearing housing; Step Y2: Pull the rear radial bearing forward axially through the maintenance hole; Step Y3: Insert the newly replaced rear radial bearing into the maintenance hole along the axial direction and install it in place; Step Y4: Replace the cover plate of the maintenance hole.

[0015] Compared with the prior art, the integrated sliding main bearing system and its maintenance method of the present invention have the following significant advantages: (1) The main shaft, thrust bearing and gearbox are integrated into a compact support unit, which reduces the number of independent support points, shortens the shaft length, and breaks through the bottleneck of bearing design for ultra-large megawatt units.

[0016] (2) The installation point of the radial bearing is placed in front, and the starting point and ending point of all maintenance actions are planned at the front end of the spindle. The radial bearing at the front end is fixed by the axial thrust plate, and the radial bearing at the rear end is designed directly on the bearing seat. This not only makes the structure simpler, but also helps to simplify the maintenance process and improve maintenance efficiency.

[0017] (3) By setting a maintenance hole in the middle of the bearing housing, the bearing bush located at the rear of the bearing housing can be pulled out axially from the front of the bearing housing through the maintenance hole, which is more in line with the ergonomic and tool operation requirements of linear maintenance, resulting in higher maintenance efficiency and more controllable operating space. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the integrated sliding main bearing system in a specific embodiment of the present invention. Figure 2 This is a schematic diagram of the partial structure of the integrated sliding main bearing system in a specific embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the assembly structure principle of the spindle and axial thrust plate in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the structural principle of the bearing housing in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure after the bearing housing is assembled with the bearing bush assembly in a specific embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the structural principle of the bearing housing after the baffle is assembled in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly of the first axial bearing and the baffle in a specific embodiment of the present invention; Figure 8This is a schematic diagram of the assembly of the second axial bearing shell on the bearing seat in a specific embodiment of the present invention.

[0019] Legend: 1. Main shaft; 2. Bearing housing; 3. Front radial bearing; 4. Rear radial bearing; 5. Axial thrust plate; 6. First axial bearing; 7. Second axial bearing; 8. Baffle; 9. Gearbox; 10. Generator; 11. Maintenance hole; 12. First annular groove; 13. Threaded hole; 14. Annular boss; 15. Through hole; 16. Second annular groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "side", "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 invention and simplifying the description, and are not intended to 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 invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0023] Example like Figure 1 and Figure 2 As shown, the integrated sliding main bearing system of the present invention includes: a main shaft 1, a bearing housing 2, a radial load-bearing assembly, an axial sliding assembly, and a gearbox 9. The bearing housing 2 has a hollow cylindrical structure, and the main shaft 1 passes through the inner cavity of the bearing housing 2. The low-speed planetary carrier of the gearbox 9 is directly connected to the end face of the main shaft 1 by high-strength bolts, and the internal gear ring of the gearbox 9 is directly connected to the end face of the bearing housing 2 by high-strength bolts. The output end of the gearbox 9 is connected to the generator 10 through a coupling. In other embodiments, the gearbox 9 can also be integrated with the generator 10.

[0024] Radial bearing components are detachably mounted on the front and rear sides of the bearing housing 2's inner cavity to support the main shaft 1 for torque transmission and radial limiting. An axial sliding assembly is detachably mounted on the front end of the bearing housing 2 to axially limit the main shaft 1. All core friction pairs can be maintained online from the front of the fan, towards the hub side.

[0025] like Figure 1 and Figure 5 As shown, the radial bearing assembly includes a front radial bearing shell 3 and a rear radial bearing shell 4. The front radial bearing shell 3 is fixed to the front part of the inner cavity of the bearing housing 2 by bolts, and the rear radial bearing shell 4 is fixed to the rear part of the inner cavity of the bearing housing 2 by bolts.

[0026] like Figure 4 As shown, multiple maintenance holes 11 are evenly distributed along the axial direction on the outer periphery of the bearing housing 2. The installation position of the rear radial bearing shell 4 is close to the maintenance holes 11, and the rear radial bearing shell 4 can be installed and removed from the rear part of the inner cavity of the bearing housing 2 through the maintenance holes 11. Furthermore, the outline dimension of the maintenance hole 11 is larger than the radial projection dimension of the rear radial bearing shell 4, providing a channel for the removal of the rear radial bearing shell 4.

[0027] like Figure 1 and Figure 2 As shown, the axial sliding assembly includes an axial thrust plate 5, a first axial bearing shell 6, a second axial bearing shell 7, and a baffle 8. At the front end of the bearing housing 2, the second axial bearing shell 7, the axial thrust plate 5, the first axial bearing shell 6, and the baffle 8 are arranged sequentially from the inside to the outside. The axial thrust plate 5 is fixed circumferentially to the outer periphery of the main shaft 1, and the first axial bearing shell 6, the second axial bearing shell 7, and the baffle 8 are all fixed to the end of the bearing housing 2.

[0028] like Figure 3 As shown, the axial thrust plate 5 is an independent sector-shaped component. It can be seen that a flange is designed at the front end of the spindle 1 so that the axial thrust plate 5 can be fixed to the outer periphery of the spindle 1 by bolts.

[0029] like Figure 1 , Figure 4 , Figure 6 and Figure 7 As shown, the upper part of the baffle 8 is provided with multiple through holes 15 arranged side by side, and the front end of the bearing seat 2 is provided with multiple sets of threaded holes 13 evenly distributed along the circumference. Studs are screwed into the through holes 15 and threaded holes 13, and the studs are locked by nuts to achieve the connection and fixation between the baffle 8 and the bearing seat 2.

[0030] like Figure 7 As shown, the lower inner side of the baffle 8 is provided with an annular boss 14, and the first axial bearing 6 is provided with a second annular groove 16. The second annular groove 16 is nested on the annular boss 14 so that the first axial bearing 6 is fixed inside the baffle 8 and pressed against the end face of the axial thrust plate 5.

[0031] like Figure 4and Figure 8 As shown, the front end of the bearing housing 2 has multiple sets of first annular grooves 12 evenly distributed along the circumference. The first annular grooves 12 are used to install the second axial bearing shell 7.

[0032] In this embodiment, a maintenance method applicable to the above-mentioned integrated sliding main bearing system is also provided, including the steps of replacing the front radial bearing shell 3, the axial thrust plate 5, the first axial bearing shell 6, the second axial bearing shell 7, and the baffle 8: Step S1: Remove the sealing device from the front of the bearing housing 2; Step S2: Remove the nuts from the fixing baffle 8, and after removing the baffle 8, remove the first axial bearing 6; Step S3: Remove the bolts between the axial thrust plate 5 and the main shaft 1, and remove the axial thrust plate 5. Step S4: Remove the second axial bearing 7 and the front radial bearing 3; Step S5: Install the newly replaced front radial bearing 3, second axial bearing 7, axial thrust plate 5, first axial bearing 6, and baffle 8 in sequence.

[0033] Furthermore, it also includes the step of replacing the rear radial bearing 4: Step Y1: Remove the cover plate of the maintenance hole 11 on the side of the bearing housing 2; Step Y2: Pull the rear radial bearing 4 forward along the axial direction through the maintenance hole 11; Step Y3: Insert the newly replaced rear radial bearing 4 into the maintenance hole 11 and install it in place axially to the rear. Step Y4: Reinstall the cover plate of maintenance hole 11.

[0034] In this embodiment, the installation point of the radial bearing is placed at the front, and the starting point and ending point of all maintenance actions are planned at the front end of the main shaft 1. The front radial bearing 3 at the front end is fixed by the axial thrust plate 5, and the rear radial bearing 4 at the rear end is directly designed on the bearing seat 2. This not only makes the structure simpler, but also helps to simplify the maintenance process and improve maintenance efficiency.

[0035] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An integrated sliding main bearing system, characterized in that, include: Main shaft (1), bearing housing (2), radial bearing assembly, axial sliding assembly and gearbox (9); the main shaft (1) passes through the inner cavity of the bearing housing (2), the input end of the gearbox (9) is connected to the main shaft (1) and the bearing housing (2) respectively, and the output end of the gearbox (9) is connected to the generator (10). The radial bearing components are detachably installed on the front and rear sides of the inner cavity of the bearing housing (2) to support the main shaft (1) for torque transmission and radial limiting; The axial sliding assembly is detachably mounted at the front end of the bearing housing (2) for axial positioning of the spindle (1).

2. The integrated sliding main bearing system according to claim 1, characterized in that, The radial bearing assembly includes a front radial bearing shell (3) and a rear radial bearing shell (4); the front radial bearing shell (3) is disposed at the front of the inner cavity of the bearing housing (2), and the rear radial bearing shell (4) is disposed at the rear of the inner cavity of the bearing housing (2).

3. The integrated sliding main bearing system according to claim 2, characterized in that, The bearing housing (2) has multiple maintenance holes (11) evenly distributed along the axial direction on its outer periphery. The rear radial bearing bush (4) can be disassembled and installed in the rear part of the inner cavity of the bearing housing (2) through the maintenance holes (11).

4. The integrated sliding main bearing system according to claim 2, characterized in that, The axial sliding assembly includes an axial thrust plate (5), a first axial bearing shell (6), a second axial bearing shell (7), and a baffle (8). At the front end of the bearing housing (2), the second axial bearing shell (7), the axial thrust plate (5), the first axial bearing shell (6), and the baffle (8) are arranged sequentially from the inside to the outside. The axial thrust plate (5) is fixed circumferentially on the outer periphery of the main shaft (1), and the first axial bearing shell (6), the second axial bearing shell (7), and the baffle (8) are all fixed at the end of the bearing housing (2).

5. The integrated sliding main bearing system according to claim 4, characterized in that, The baffle (8) has multiple through holes (15) arranged side by side on the upper part, and the bearing seat (2) has multiple sets of threaded holes (13) evenly distributed along the circumference at the front end. Studs are screwed into the through holes (15) and threaded holes (13), and the studs are locked by nuts to achieve connection and fixation between the baffle (8) and the bearing seat (2).

6. The integrated sliding main bearing system according to claim 5, characterized in that, The baffle (8) has an annular boss (14) on its lower inner side, and the first axial bearing (6) has a second annular groove (16). The second annular groove (16) is nested on the annular boss (14) to fix the first axial bearing (6) inside the baffle (8).

7. The integrated sliding main bearing system according to claim 4, characterized in that, The bearing housing (2) has multiple sets of first annular grooves (12) evenly distributed along the circumference at its front end. The first annular grooves (12) are used to install the second axial bearing shell (7).

8. The integrated sliding main bearing system according to any one of claims 4 to 7, characterized in that, The axial thrust plate (5) is a fan-shaped component, and the axial thrust plate (5) is fixed to the outer periphery of the main shaft (1) by bolts.

9. A maintenance method, characterized in that, The maintenance method is applicable to the integrated sliding main bearing system according to any one of claims 4 to 8, and includes the steps of replacing the front radial bearing shell (3), the axial thrust plate (5), the first axial bearing shell (6), the second axial bearing shell (7), and the baffle (8): Step S1: Remove the sealing device from the front of the bearing housing (2); Step S2: Remove the nuts of the fixed baffle (8), and after removing the baffle (8), remove the first axial bearing (6). Step S3: Remove the bolts between the axial thrust plate (5) and the main shaft (1) and remove the axial thrust plate (5); Step S4: Remove the second axial bearing (7) and the front radial bearing (3); Step S5: Install the newly replaced front radial bearing (3), second axial bearing (7), axial thrust plate (5), first axial bearing (6) and baffle (8) in sequence.

10. The maintenance method according to claim 9, characterized in that, It also includes the step of replacing the rear radial bearing (4): Step Y1: Remove the cover plate of the maintenance hole (11) on the side of the bearing housing (2); Step Y2: Pull the rear radial bearing (4) forward along the axial direction through the maintenance hole (11); Step Y3: Insert the newly replaced rear radial bearing (4) axially into the maintenance hole (11) and install it in place; Step Y4: Reinstall the cover plate of the maintenance hole (11).

Images