Wind turbine main shaft integrated sliding bearing transmission system

Abstract

Disclosed in the present invention is a wind turbine main shaft integrated sliding bearing transmission system, comprising a wind turbine main shaft. The wind turbine main shaft is integrally provided with at least one inner ring; a first sliding layer is arranged on the outer surface of the inner ring; a bearing seat is arranged outside the inner ring; and a second sliding layer is arranged on the inner ring of the bearing seat. According to the present invention, the wind turbine main shaft, the bearing seat and a sliding bearing are considered as a whole; the number and functions of parts are considered from the perspective of integrating the main shaft and the bearing seat unit, thereby fully utilizing the performance of the parts; and the sliding layers are directly integrated on the outer surface of the main shaft or the inner surface of the bearing seat, the inner ring of the sliding bearing and the main shaft are integrated into a whole, and an outer ring of the sliding bearing and the bearing seat are integrated into a whole, reducing the number of parts of the sliding bearing, and finally achieving the objective of reducing the number of overall parts and simplifying the assembly and installation of the wind turbine main shaft and the sliding bearing.

Description

An integrated sliding bearing transmission system for a wind turbine main shaft Technical Field

[0001] The present invention belongs to the field of wind turbine main shafts, and in particular relates to an integrated sliding bearing transmission system for a wind turbine main shaft. Background Art

[0002] With the development of the wind power industry, the levelized cost of electricity (LCOE) has been declining annually due to competitive product competition, leading to a market trend toward larger wind turbines. As wind turbines become larger, the rolling bearings used in the main shaft become larger, heavier, and more expensive. This results in a yearly increase in the weight and cost of the main bearings within large wind turbines, which runs counter to the original goal of larger wind turbines: reducing the cost per kilowatt-hour. Furthermore, the maintenance and replacement of damaged wind turbine main bearings remains a significant costly and time-consuming industry challenge. Consequently, the use of more compact, in-nacelle replaceable plain bearings as main bearings has become a technological trend.

[0003] The main shaft bearings of wind turbines primarily support the main shaft, withstand alternating impact loads, and constrain axial displacement. They are crucial components of wind turbines. Wind turbines operate in harsh environments, and the forces they withstand are complex and variable, necessitating extremely high reliability requirements. With increasing installed capacity and the emergence of large-megawatt models, the size of rolling main bearings continues to increase, raising manufacturing costs and increasing the difficulty and cost of wind turbine installation. Consequently, the continuous development of the wind power industry places higher demands on the design, manufacturing, installation, and maintenance of main shaft bearings. This has led to significant challenges for traditional technical solutions in terms of reliability, manufacturing, installation, and cost.

[0004] Driven by the technological trend of "sliding instead of rolling" in wind turbine main bearings, major wind turbine manufacturers and bearing companies have invested significant effort in the research, development, and trial production of sliding bearings suitable for wind turbine main bearings. Whether using existing rolling bearing solutions or the emerging sliding bearing approach, achieving the interference fit between the bearing's inner ring and the main shaft remains a major technical challenge. In this context, minimizing the overall manufacturing cost of sliding bearing systems while addressing or partially resolving installation and operation challenges is crucial to the future success of sliding main bearing transmission systems in the market. Technical issues

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an integrated sliding bearing transmission system for a wind turbine main shaft, integrating the inner ring of the sliding bearing into the main shaft and the outer ring of the sliding bearing into the bearing seat. By using this integrated design, the number of parts and manufacturing costs are reduced, and some problems arising during installation and use are also solved. Technical Solutions

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A wind turbine main shaft integrated sliding bearing transmission system includes a wind turbine main shaft, wherein at least one inner ring is integrally provided on the wind turbine main shaft, the outer surface of the inner ring is provided with a first sliding layer, and the outside of the inner ring is provided with a bearing seat; the inner ring of the bearing seat is provided with a second sliding layer.

[0008] Furthermore, the busbar of the inner ring is close to the shape of an arc, and the cross-section of the inner ring has the same shape in the circumferential direction of the entire wind turbine main shaft. The radius of the inner ring is determined according to factors such as the size of the wind turbine main shaft, the load it bears, and the expected deflection of the shaft. The first sliding layer is arranged on the arc surface, and when the inner ring adopts an arc-shaped structure, the bearing seat adopts a split bearing seat, that is, the upper cover and the base of the bearing seat are separable, which facilitates the installation of the bearing seat.

[0009] Furthermore, the inner ring has a hemispherical structure, and the cross-section of the inner ring has the same shape in the circumferential direction of the entire wind turbine main shaft. The first sliding layer is arranged on the hemispherical surface, and when the inner ring adopts a hemispherical structure, the bearing seat adopts an integrated bearing seat, and a bearing end cover is provided on one side of the bearing seat, which is conducive to reducing the number of parts.

[0010] Furthermore, a third sliding layer is provided on the left side surface of the hemisphere, the bearing end cover is arranged on the left side of the hemisphere, and a fourth sliding layer is provided on one side of the bearing end cover.

[0011] Furthermore, the inner ring of the bearing end cover and the inner ring of the bearing seat are both provided with seals, and the seals adopt a two-sealing structure, wherein the inner side adopts a labyrinth sealing structure and the outer side adopts a contact sealing structure.

[0012] Furthermore, oil grooves are provided on the second sliding layer and the fourth sliding layer.

[0013] Furthermore, the first sliding layer, the second sliding layer, the third sliding layer and the fourth sliding layer are made of existing alloy materials and polymer materials, such as copper alloy, babbitt metal, aluminum alloy, polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), fabric, fiber, nylon, epoxy resin, acrylic acid, polyurethane, PPS, POM, etc.

[0014] Furthermore, the hardness of the first sliding layer is higher than that of the second sliding layer, and the hardness of the third sliding layer is higher than that of the fourth sliding layer.

[0015] Furthermore, the first sliding layer, the second sliding layer, the third sliding layer and the fourth sliding layer are connected to the wind turbine main shaft, the bearing seat or the bearing end cover by means of cold or hot spraying, PVD, laser cladding, coating, sintering and the like.

[0016] Furthermore, one of the inner rings is arranged along the axial direction of the wind turbine main shaft, and the position of the inner ring is determined according to the stress condition of the wind turbine main shaft.

[0017] Furthermore, the inner ring includes two inner rings.

[0018] Furthermore, the two inner rings both have arc cross-sections; or, one of the two inner rings is designed to have an arc cross-section, and the other inner ring is designed to have a hemispherical structure. Beneficial effects

[0019] The beneficial effects of the present invention are:

[0020] 1) This invention considers the wind turbine main shaft, bearing seat, and sliding bearing as a single unit. The number and function of components are considered from the perspective of an integrated main shaft and bearing seat unit, thereby fully utilizing the performance of each component. In particular, instead of using a separate sliding pad, the sliding layer is directly integrated into the outer surface of the main shaft or the inner surface of the bearing seat. The inner ring of the sliding bearing is integrated with the main shaft, and the outer ring of the sliding bearing is integrated with the bearing seat. This reduces the number of sliding bearing components and simplifies the assembly process, ultimately achieving the goal of reducing the overall component count and simplifying the assembly and installation of the wind turbine main shaft and sliding bearing.

[0021] 2) The size and shape of the inner ring can be determined according to factors such as the size of the wind turbine main shaft, the load of the six degrees of freedom it bears, and the expected deflection of the shaft. While ensuring the radial load of the wind turbine main shaft, the axial load of the wind turbine main shaft is also guaranteed.

[0022] 3) When the inner ring adopts a hemispherical structure, a third sliding layer is set on the left side of the hemisphere, and a fourth sliding layer is set on the bearing end cover on the left side of the hemisphere, ensuring that the thrust surface meets the requirements of the friction pair surface of the sliding bearing.

[0023] 4) Oil grooves are provided on the second sliding layer and the fourth sliding layer to achieve lubrication of the sliding bearings.

[0024] 5) The hardness of the first sliding layer is higher than that of the second sliding layer, and the hardness of the third sliding layer is higher than that of the fourth sliding layer. As the harder material in the sliding friction pair, a layer of soft material is coated on the bearing seat and the bearing end cover. As the softer material in the sliding friction pair, the purpose of doing so is to give priority to protecting the main shaft from severe wear. When the sliding bearing is repaired or replaced, the main shaft is avoided from being replaced, thereby reducing the cost of using the wind turbine main shaft.

[0025] 6) There can be one or two inner rings on the wind turbine main shaft. The number of inner rings is determined according to the design requirements of the wind turbine main shaft, and the position of the inner ring can be determined according to the stress conditions of the wind turbine main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a wind turbine main shaft integrated sliding bearing transmission system according to Example 1 of the present invention.

[0027] FIG2 is a cross-sectional view of the wind turbine main shaft of the wind turbine main shaft integrated sliding bearing transmission system shown in FIG1 .

[0028] FIG3 is a schematic diagram of the structure of a split bearing seat in the wind turbine main shaft integrated sliding bearing transmission system shown in FIG1 .

[0029] FIG4 is a cross-sectional view of a wind turbine main shaft according to a third embodiment of a wind turbine main shaft integrated sliding bearing transmission system of the present invention.

[0030] FIG5 is a schematic structural diagram of a wind turbine main shaft integrated sliding bearing transmission system according to embodiment 2 of the present invention.

[0031] FIG6 is a cross-sectional view of the wind turbine main shaft of the wind turbine main shaft integrated sliding bearing transmission system shown in FIG5 , wherein the wind turbine main shaft is mounted on a bearing seat.

[0032] FIG7 is a partial enlarged view of FIG6 of an integrated sliding bearing transmission system for a wind turbine main shaft according to the present invention.

[0033] FIG8 is an enlarged view of an integrated bearing seat and a bearing end cover in an integrated sliding bearing transmission system for a wind turbine main shaft according to the present invention.

[0034] FIG9 is a cross-sectional view of a wind turbine main shaft integrated sliding bearing transmission system according to embodiment 4 of the present invention.

[0035] FIG10 is a cross-sectional view of a wind turbine main shaft integrated sliding bearing transmission system according to embodiment 5 of the present invention.

[0036] In the figure: 1. Wind turbine main shaft; 2. Bearing seat; 3. Oil groove; 4. Inner ring; 41-first inner ring; 42-second inner ring; 5. First sliding layer; 6. Second sliding layer; 7. Seal; 8. Bearing end cover; 9. Third sliding layer; 10. Fourth sliding layer. Modes for Carrying Out the Invention

[0037] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with Figures 1-10. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, specific orientation structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0039] Example 1

[0040] As shown in Figures 1-3, a wind turbine main shaft integrated sliding bearing transmission system includes a wind turbine main shaft 1. The wind turbine main shaft 1 is provided with at least one inner ring 4, the outer surface of which is provided with a first sliding layer 5, and the lower portion of the inner ring 4 is provided with a bearing seat 2. As shown in Figure 3, the inner ring of each bearing seat 2 is provided with a second sliding layer 6. Preferably, the thickness of the second sliding layer 6 is 2-15 μm. In this transmission system, the wind turbine main shaft 1, bearing seat 2, and sliding bearing are considered as a whole. The number and function of components are considered from the perspective of an integrated main shaft and bearing seat 2 unit, thereby fully utilizing the performance of each component. In particular, instead of using separate sliding pads, the sliding layer is directly integrated onto the outer surface of the main shaft or the inner surface of the bearing seat 2. The sliding bearing inner ring 4 is integrated with the main shaft, and the sliding bearing outer ring is integrated with the bearing seat 2. This reduces the number of sliding bearing components and simplifies the assembly process, ultimately achieving the goal of reducing the overall number of components and simplifying the assembly and installation of the wind turbine main shaft 1 and sliding bearing.

[0041] As shown in Figure 2, the generatrix of the inner ring 4 approximates a circular arc shape, and the cross-section of the inner ring 4 maintains a uniform shape along the entire circumference of the wind turbine main shaft 1. The radius of the inner ring 4 is determined based on factors such as the diameter of the wind turbine main shaft 1, the loads it bears in six degrees of freedom, and the expected shaft deflection. The first sliding layer 5 is provided on the arc surface. When the inner ring 4 adopts an arc-shaped structure, the bearing seat 2 adopts a split bearing seat (as shown in Figure 3), where the upper cover and base of the bearing seat 2 are separable, facilitating installation. Since the inner ring 4 is integrally forged (or cast) with the main shaft, subsequent processing and installation of a separate inner ring 4 is eliminated. A sliding bearing transmission system employing this arc-shaped inner ring 4 primarily bears radial and axial loads. Preferably, the thickness of the first sliding layer 5 is 0.5-15 mm. The two sides of the inner ring 4 are respectively set as the first end and the second end (specifically, the left side of the inner ring 4 is set as the first end, and the right side of the inner ring 4 is set as the second end), wherein the distance between the outer side of the first end and the axis of the wind turbine main shaft 1 is equal to the distance between the outer side of the second end and the axis of the wind turbine main shaft 1.

[0042] Example 2

[0043] Unlike Example 1, as shown in Figures 5-8 , the inner ring 4 has a hemispherical structure, and its cross-section is uniform along the entire circumference of the wind turbine main shaft 1. The first sliding layer 5 is disposed on the hemispherical surface. When the inner ring 4 is hemispherical, the bearing seat 2 is an integrated bearing seat (as shown in Figure 8 ). A bearing end cap 8 is provided on one side of the bearing seat 2, which helps reduce the number of components. Since it is integrally forged (or cast) with the main shaft, the subsequent processing and installation of the separate inner ring 4 is eliminated. The sliding bearing transmission system using this arc-shaped inner ring 4 primarily bears large radial loads and a portion of smaller axial loads. The two sides of the inner ring 4 are respectively designated as a first end and a second end (specifically, the left side of the inner ring 4 is designated as the first end, and the right side of the inner ring 4 is designated as the second end). The distance between the outer side of the first end and the axis of the wind turbine main shaft 1 is greater than the distance between the outer side of the second end and the axis of the wind turbine main shaft 1. The sliding bearing transmission system using the hemispherical inner ring 4 mainly bears a large axial load and a part of a smaller radial load. Specifically, the hemispherical surface bears the radial load, and the left side of the "hemisphere" mainly bears the axial load in the other direction; at the same time, due to the existence of the hemispherical surface, the main shaft can also achieve a certain degree of inclination relative to the bearing seat 2 under the action of the load, thereby reducing the stress generated on the sliding contact surface.

[0044] As shown in FIG7 , a third sliding layer 9 is provided on the left side of the hemisphere, the bearing end cover 8 is provided on the left side of the hemisphere, and a fourth sliding layer 10 is provided on one side of the bearing end cover 8, thereby ensuring that the thrust surface meets the requirements of the friction pair surface of the sliding bearing.

[0045] As shown in Figure 7, the inner ring of the bearing end cover 8 and the inner ring of the bearing seat 2 are both provided with a seal 7. The seal 7 adopts a two-sealing structure, wherein the inner side adopts a labyrinth sealing structure and the outer side adopts a contact sealing structure. The labyrinth sealing structure and the contact sealing structure both adopt conventional means in this field, and their structures are not described in detail.

[0046] As shown in Figures 3 and 8 , oil grooves 3 are provided on the second sliding layer 6 and the fourth sliding layer 10 to lubricate the sliding bearing. Alternatively, multiple oil grooves 3 may be provided along the axis or on the side of the inner ring 4 to allow lubrication. This allows lubricating oil to flow between the first sliding layer 5 and the second sliding layer 6, and between the third sliding layer 9 and the fourth sliding layer 10. However, this approach can negatively impact spindle strength. Preferably, the depth of the oil grooves 3 is no less than the thickness of the corresponding sliding layer.

[0047] The first sliding layer 5, the second sliding layer 6, the third sliding layer 9 and the fourth sliding layer 10 are selected from existing alloy materials and polymer materials, such as copper alloy, babbitt metal, aluminum alloy, polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), fabric, fiber, nylon, epoxy resin, acrylic acid, polyurethane, PPS, POM, etc.

[0048] The hardness of the first sliding layer 5 is higher than that of the second sliding layer 6, and the hardness of the third sliding layer 9 is higher than that of the fourth sliding layer 10. For example, the first sliding layer 5 and the third sliding layer 9 are made of copper alloy, and the second sliding layer 6 and the fourth sliding layer 10 are made of polytetrafluoroethylene. A layer of hard material is coated on the inner ring 4 as the harder material in the sliding friction pair, and a layer of soft material is coated on the bearing seat 2 and the bearing end cover 8 as the softer material in the sliding friction pair. The purpose of this is to give priority to protecting the main shaft from severe wear. When the sliding bearing is repaired or replaced, the wind turbine main shaft is avoided from being replaced, thereby reducing the use cost of the wind turbine main shaft 1.

[0049] The first sliding layer 5, the second sliding layer 6, the third sliding layer 9 and the fourth sliding layer 10 are connected to the wind turbine main shaft 1, the bearing seat 2 or the bearing end cover 8 by cold and hot spraying, PVD, laser cladding, coating, sintering, etc., so that the overall structure becomes simpler and more reliable.

[0050] Example 3

[0051] The difference from Example 1 is that, as shown in Figure 4, two inner rings 4 are provided on the wind turbine main shaft 1, and both inner rings 4 have arc cross-sections. In other embodiments, one of the inner rings 4 can be designed as an arc cross-section, and the other inner ring 4 can be designed as a hemispherical structure.

[0052] Example 4

[0053] Unlike Example 2, as shown in FIG9 , Example 4 of the present invention includes two inner rings 4 on the wind turbine main shaft 1: a first inner ring 41 and a second inner ring 42, spaced apart along the axial direction of the wind turbine main shaft 1. Preferably, the first inner ring 41 and the second inner ring 42 each have a substantially hemispherical structure. The first inner ring 41 is provided with a first end and a second end on either side (specifically, the left side of the first inner ring 41 is provided as the first end, and the right side of the first inner ring 41 is provided as the second end). The distance between the outer side of the first end and the axis of the wind turbine main shaft 1 is greater than the distance between the outer side of the second end and the axis of the wind turbine main shaft 1. The second inner ring 42 is provided with a third end and a fourth end on either side (specifically, the right side of the second inner ring 42 is provided as the third end, and the left side of the second inner ring 42 is provided as the fourth end). The distance between the outer side of the third end and the axis of the wind turbine main shaft 1 is greater than the distance between the outer side of the fourth end and the axis of the wind turbine main shaft 1, and the fourth end is provided adjacent to the second end. That is, in the axial direction of the wind turbine main shaft 1 , the first end of the first inner ring 41 , the second end of the first inner ring 41 , the fourth end of the second inner ring 42 and the third end of the second inner ring 42 are arranged in this order.

[0054] In this embodiment, bearing seats 2 are respectively provided outside the first inner ring 41 and the second inner ring 42 .

[0055] Example 5

[0056] Unlike Example 2, as shown in FIG10 , Example 4 of the present invention includes two inner rings 4 on the wind turbine main shaft 1: a first inner ring 41 and a second inner ring 42, spaced apart along the axial direction of the wind turbine main shaft 1. Preferably, the first inner ring 41 is generally hemispherical, while the second inner ring 42 is generally cylindrical, protruding radially outward from the wind turbine main shaft 1. The first inner ring 41 has two sides that are respectively designated as a first end and a second end (specifically, the left side of the first inner ring 41 is designated as the first end, and the right side of the first inner ring 41 is designated as the second end), wherein the distance between the outer side of the first end and the axis of the wind turbine main shaft 1 is greater than the distance between the outer side of the second end and the axis of the wind turbine main shaft 1. The second inner ring 42 is arranged on either side as a third end and a fourth end, respectively (specifically, the right side of the second inner ring 42 is the third end, and the left side of the second inner ring 42 is the fourth end). The distance between the outer side of the third end and the axis of the wind turbine main shaft 1 is equal to the distance between the outer side of the fourth end and the axis of the wind turbine main shaft 1, and the fourth end is positioned adjacent to the second end. In other words, in the axial direction of the wind turbine main shaft 1, the first end of the first inner ring 41, the second end of the first inner ring 41, the fourth end of the second inner ring 42, and the third end of the second inner ring 42 are arranged in this order. Preferably, the first inner ring 41 primarily bears axial forces, while the first and second inner rings 41, 42 primarily bear radial forces in the circumferential direction.

[0057] In this embodiment, a bearing seat 2 is provided outside the first inner ring 41 and the second inner ring 42 .

[0058] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A wind turbine main shaft integrated sliding bearing transmission system, comprising a wind turbine main shaft, characterized in that: At least one inner ring is integrally provided on the wind turbine main shaft, a first sliding layer is provided on the outer surface of the inner ring, a bearing seat is provided outside the inner ring; and a second sliding layer is provided on the inner ring of the bearing seat.

2. The wind turbine main shaft integrated sliding bearing transmission system according to claim 1, characterized in that: The generatrix of the inner ring is close to the shape of an arc, and the cross-section of the inner ring has the same shape in the circumferential direction of the entire wind turbine main shaft. The radius of the inner ring is determined according to factors such as the size of the wind turbine main shaft, the load it bears, and the expected deflection of the shaft. The first sliding layer is arranged on the arc surface, and when the inner ring adopts an arc structure, the bearing seat adopts a split bearing seat, that is, the upper cover and the base of the bearing seat are separable.

3. The wind turbine main shaft integrated sliding bearing transmission system according to claim 1, characterized in that: The inner ring has a hemispherical structure, and the cross section of the inner ring has the same shape in the circumferential direction of the entire wind turbine main shaft. The first sliding layer is arranged on the hemispherical surface. When the inner ring adopts a hemispherical structure, the bearing seat adopts an integrated bearing seat, and a bearing end cover is provided on one side of the bearing seat.

4. The wind turbine main shaft integrated sliding bearing transmission system according to claim 3, characterized in that: A third sliding layer is arranged on the left side surface of the hemisphere, the bearing end cover is arranged on the left side of the hemisphere, and a fourth sliding layer is arranged on one side of the bearing end cover.

5. The wind turbine main shaft integrated sliding bearing transmission system according to claim 3, characterized in that: The inner ring of the bearing end cover and the inner ring of the bearing seat are both provided with seals, and the seals adopt a two-stage sealing structure, wherein the inner side adopts a labyrinth sealing structure and the outer side adopts a contact sealing structure.

6. The wind turbine main shaft integrated sliding bearing transmission system according to claim 4, characterized in that: Oil grooves are provided on the second sliding layer and the fourth sliding layer.

7. The wind turbine main shaft integrated sliding bearing transmission system according to claim 4, characterized in that: The first sliding layer, the second sliding layer, the third sliding layer and the fourth sliding layer are made of existing alloy materials and polymer materials, such as copper alloy, babbitt alloy, aluminum alloy, polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), fabric, fiber, nylon, epoxy resin, acrylic acid, polyurethane, PPS, POM, etc.

8. The wind turbine main shaft integrated sliding bearing transmission system according to claim 4, characterized in that: The hardness of the first sliding layer is higher than that of the second sliding layer, and the hardness of the third sliding layer is higher than that of the fourth sliding layer.

9. The wind turbine main shaft integrated sliding bearing transmission system according to claim 4, characterized in that: The first sliding layer, the second sliding layer, the third sliding layer and the fourth sliding layer are connected to the wind turbine main shaft, the bearing seat or the bearing end cover by cold or hot spraying, PVD, laser cladding, coating, sintering and the like.

10. The wind turbine main shaft integrated sliding bearing transmission system according to claim 1, characterized in that: One of the inner rings is arranged along the axial direction of the wind turbine main shaft, and the position of the inner ring is determined according to the stress condition of the wind turbine main shaft.

11. The wind turbine main shaft integrated sliding bearing transmission system according to claim 1, characterized in that: The inner ring includes two inner rings.

12. The wind turbine main shaft integrated sliding bearing transmission system according to claim 11, characterized in that: The two inner rings both have arc cross-sections; or, one of the two inner rings is designed to have an arc cross-section, and the other inner ring is designed to have a hemispherical structure.

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