Wind turbine main shaft assembly and wind turbine generator system

Abstract

The application relates to the technical field of wind power generation, in particular to a wind turbine main shaft assembly and a wind turbine. The wind turbine main shaft assembly comprises a main shaft, a gear box input shaft, a roller bearing and a sliding bearing; the main shaft is provided with a thrust surface, the gear box input shaft is connected with the main shaft; the roller bearing is sleeved on the main shaft, and the roller bearing is a self-aligning roller bearing or a cylindrical roller bearing; a bearing seat is sleeved on the roller bearing and is rotatably connected with the main shaft through the roller bearing, and the bearing seat is used for being connected with a base of the wind turbine; a front sliding thrust pad is used for being in contact with the thrust surface; a fixed seat is connected with the main shaft, the fixed seat and a rear sliding thrust pad are located at the same end of the roller bearing, and the rear sliding thrust pad is used for being in contact with the fixed seat. The wind turbine main shaft assembly adopts a bearing structure form combining the roller bearing and the sliding bearing, the bearing structure size is smaller, the bearing capacity is higher, and axial wear of rollers of the roller bearing caused by axial floating can be avoided.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and more specifically, to a wind turbine main shaft assembly and a wind turbine generator set. Background Technology

[0002] As the power rating and blade length of wind turbine generators increase, the overturning moment borne by the hub center gradually increases, resulting in a significant increase in the axial and radial forces transmitted to the main bearing. To meet the load-bearing requirements of the main bearing, the bearing size and model are constantly increasing, and the corresponding main shaft structure size is also increasing accordingly. This increases the difficulty of bearing manufacturing and processing, leading to an increase in the cost of the generator set.

[0003] However, since existing roller bearings and cylindrical roller bearings in wind turbine generators have a large radial load capacity, increasing the bearing size solely to address the axial bearing capacity issue would lead to an uneven distribution of bearing load capacity margin. Currently, to address the issue of bearing load capacity and cost, most systems employ asymmetric roller bearing structures, but these are difficult to manufacture and unsuitable for mass production applications. Alternatively, a dual-point support structure can be used, but due to the large positive clearance of the selected roller and cylindrical roller bearings, the axial force they can bear is limited, resulting in severe axial wear of the bearing rollers and significant impact on the gearbox connected at the tail of the shaft system. Summary of the Invention

[0004] The objectives of this invention include, for example, providing a wind turbine main shaft assembly and a wind turbine generator set, which adopt a bearing structure combining roller bearings and sliding bearings. The roller bearings are mainly roller bearings and cylindrical roller bearings, primarily bearing radial forces, while the sliding bearings primarily bear axial loads. By decomposing the axial and radial forces through different load paths, the bearing structure is smaller and has a higher load-bearing capacity compared to using pure roller bearings, under the same wind turbine generator power and impeller diameter. It can also accommodate more bearing specifications and models. The axial sliding bearings used have greater axial oil film stiffness, thereby avoiding axial wear on the roller bearing rollers caused by axial floating.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a wind turbine main shaft assembly, which includes a main shaft, a gearbox input shaft, a roller bearing, and a sliding bearing;

[0007] The main shaft is equipped with a thrust surface, and the gearbox input shaft is connected to the main shaft; roller bearings are sleeved on the main shaft;

[0008] The sliding bearing includes a bearing housing, a front sliding thrust pad, a fixed seat, and a rear sliding thrust pad. The bearing housing is sleeved on the outside of the roller bearing and rotatably connected to the main shaft through the roller bearing. The bearing housing is used to connect to the base of the wind turbine. Along the axial direction of the main shaft, the front sliding thrust pad and the rear sliding thrust pad are located at both ends of the bearing housing and the roller bearing, and both the front sliding thrust pad and the rear sliding thrust pad are connected to the bearing housing. The front sliding thrust pad is used to contact the thrust surface. The fixed seat is connected to the main shaft. The fixed seat and the rear sliding thrust pad are located at the same end of the roller bearing. The fixed seat is located between the rear sliding thrust pad and the roller bearing, and the rear sliding thrust pad is used to contact the fixed seat.

[0009] In an optional embodiment, the roller bearing includes an inner ring, an outer ring, and a plurality of bearing rollers;

[0010] The inner ring of the bearing is interference-fitted with the spindle, and multiple bearing rollers are arranged between the inner ring and the outer ring of the bearing, while the outer ring of the bearing is interference-fitted with the bearing housing.

[0011] In an optional embodiment, the wind turbine main shaft assembly further includes a bearing inner ring spacer, which is connected to the main shaft and is located between the fixed seat and the bearing inner ring, and abuts against the fixed seat and the bearing inner ring.

[0012] In an optional embodiment, the wind turbine main shaft assembly further includes a front end cap and a rear end cap;

[0013] Along the axis of the main shaft, the front end cap and the rear end cap are located at both ends of the bearing housing and are both connected to the bearing housing; the front sliding thrust pad is connected to the front end cap or the bearing housing, and the rear sliding thrust pad is connected to the rear end cap.

[0014] In an optional embodiment, the rear end cap is provided with a supporting portion that abuts against the outer ring of the bearing.

[0015] In an optional embodiment, the wind turbine main shaft assembly further includes a front sealing plate, a front sealing ring, a rear sealing plate, and a rear sealing ring.

[0016] Along the axis of the main shaft, the front sealing plate and the front sealing ring are located at one end of the bearing housing, and the rear sealing plate and the rear sealing ring are located at the other end of the bearing housing; the front sealing plate and the front sealing ring are arranged between the front end cover and the main shaft, and the rear sealing plate and the rear sealing ring are arranged between the rear end cover and the main shaft.

[0017] In an optional embodiment, the wind turbine main shaft assembly further includes a self-adjusting rib with the front sliding thrust bearing and a self-adjusting rib with the rear sliding thrust bearing.

[0018] The self-adjusting rib of the front sliding thrust bearing is connected to the front sliding thrust bearing and is located between the contact surfaces of the front sliding thrust bearing and the bearing housing. The cross-section of the contact surface between the self-adjusting rib of the front sliding thrust bearing and the bearing housing is arc-shaped.

[0019] The self-adjusting rib of the rear sliding thrust pad is connected to the rear sliding thrust pad and is located between the contact surfaces of the rear sliding thrust pad and the rear end cap. The cross-section of the contact surface between the self-adjusting rib of the rear sliding thrust pad and the rear end cap is arc-shaped.

[0020] In an optional embodiment, the front sliding thrust bearing self-adjusting rib is provided with a first gap between the side of the front sliding thrust bearing facing the thrust surface and the thrust surface, and the rear sliding thrust bearing self-adjusting rib is provided with a second gap between the side of the rear sliding thrust bearing facing the fixed seat and the fixed seat.

[0021] In an optional embodiment, the wind turbine main shaft assembly further includes a connecting bolt member, the axis of which is parallel to the axis of the main shaft, and the connecting bolt member passes through the bearing housing and connects the front end cap, the bearing housing, and the rear end cap.

[0022] Secondly, the present invention provides a wind turbine generator set, which includes the aforementioned wind turbine generator set main shaft assembly.

[0023] The beneficial effects of the embodiments of the present invention include:

[0024] The wind turbine main shaft assembly includes a main shaft, a gearbox input shaft, roller bearings, and sliding bearings. The main shaft is equipped with a thrust surface, and the gearbox input shaft is connected to the main shaft. The roller bearings are sleeved on the main shaft and are either self-aligning roller bearings or cylindrical roller bearings. The sliding bearings include a bearing housing, a front sliding thrust pad, a fixed seat, and a rear sliding thrust pad. The bearing housing is sleeved on the outside of the roller bearings and rotatably connected to the main shaft through the roller bearings. The bearing housing is used to connect to the base of the wind turbine. Along the axial direction of the main shaft, the front and rear sliding thrust pads are located at both ends of the bearing housing and the roller bearings, and both the front and rear sliding thrust pads are connected to the bearing housing. The front sliding thrust pad is used to contact the thrust surface. The fixed seat is connected to the main shaft, and the fixed seat and the rear sliding thrust pad are located at the same end of the roller bearings. The fixed seat is located between the rear sliding thrust pad and the roller bearings, and the rear sliding thrust pad is used to contact the fixed seat.

[0025] The main shaft assembly of this wind turbine adopts a bearing structure combining roller bearings and sliding bearings. The roller bearings are mainly roller bearings and cylindrical roller bearings, which mainly bear the radial force of the bearing, while the sliding bearings mainly bear the axial load. By decomposing the axial and radial forces through different load paths, the bearing structure is smaller and has a higher load-bearing capacity than using pure roller bearings, under the same wind turbine power and impeller diameter. It can also accommodate more bearing specifications and models. The axial sliding bearings used have greater axial oil film stiffness, which can avoid axial wear of the roller bearing rollers caused by axial floating. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the wind turbine main shaft assembly in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the sliding bearing in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the self-aligning roller bearing in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of a double-support shaft system structure in other embodiments of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the self-adjusting rib of the front sliding thrust bearing in an embodiment of the present invention.

[0032] Icons: 100-Wind turbine main shaft assembly; 110-Main shaft; 120-Gearbox input shaft; 130-Roller bearing; 140-Self-aligning roller bearing; 150-Sliding bearing; 111-Thrust surface; 151-Bearing housing; 152-Front sliding thrust bearing; 153-Fixed seat; 154-Rear sliding thrust bearing; 141-Bearing inner ring; 142-Bearing outer ring; 143-Bearing roller; 161-Bearing inner ring spacer; 162-Front end cap; 163-Rear end cap; 164-Supporting part; 165-Front sealing plate; 166-Front sealing ring; 167-Rear sealing plate; 168-Rear sealing ring; 169-Front sliding thrust bearing self-adjusting rib; 170-Connecting bolts. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this 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 this invention.

[0037] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0039] Please refer to Figures 1-3 This embodiment provides a wind turbine main shaft assembly 100, which includes a main shaft 110, a gearbox input shaft 120, a roller bearing 130, and a sliding bearing 150.

[0040] The main shaft 110 is equipped with a thrust surface 111, and the gearbox input shaft 120 is connected to the main shaft 110; the roller bearing 130 is sleeved on the main shaft 110;

[0041] The sliding bearing 150 includes a bearing housing 151, a front sliding thrust bearing 152, a fixed base 153, and a rear sliding thrust bearing 154. The bearing housing 151 is sleeved on the outside of the roller bearing 130 and rotatably connected to the main shaft 110 through the roller bearing 130. The bearing housing 151 is used to connect to the base of the wind turbine. Along the axial direction of the main shaft 110, the front sliding thrust bearing 152 and the rear sliding thrust bearing 154 are located between the bearing housing 151 and the roller bearing 130. Both ends of the bearing are connected to the bearing housing 151, and the front sliding thrust pad 152 and the rear sliding thrust pad 154 are connected to the bearing housing 151. The front sliding thrust pad 152 is used to contact the thrust surface 111. The fixed seat 153 is connected to the main shaft 110. The fixed seat 153 and the rear sliding thrust pad 154 are located at the same end of the roller bearing 130. The fixed seat 153 is located between the rear sliding thrust pad 154 and the roller bearing 130, and the rear sliding thrust pad 154 is used to contact the fixed seat 153.

[0042] Please refer to Figures 1-3 The working principle of the wind turbine main shaft assembly 100 is as follows:

[0043] The wind turbine main shaft assembly 100 includes a main shaft 110, a gearbox input shaft 120, a roller bearing 130, and a sliding bearing 150. The main shaft 110 is equipped with a thrust surface 111, and the gearbox input shaft 120 is connected to the main shaft 110. The roller bearing 130 is sleeved on the main shaft 110, and the roller bearing 130 is either a self-aligning roller bearing 140 or a cylindrical roller bearing 130. The sliding bearing 150 includes a bearing housing 151, a front sliding thrust bearing 152, a fixed seat 153, and a rear sliding thrust bearing 154.

[0044] Taking the self-aligning roller bearing 140 as an example, when installing the sliding bearing 150, the bearing housing 151 is positioned outside the self-aligning roller bearing 140 and spaced from the main shaft 110, thereby forming a mounting cavity for installing the self-aligning roller bearing 140. When installing the self-aligning roller bearing 140, the inner ring 141 of the self-aligning roller bearing 140 is connected to the main shaft 110, and the outer ring 142 of the self-aligning roller bearing 140 is connected to the bearing housing 151, thereby making the bearing housing 151 rotatably connected to the main shaft 110; the bearing housing 151 is used to connect to the base of the wind turbine unit.

[0045] The main shaft 110 is used to transfer the load from the impeller end of the unit to the unit. The end of the main shaft 110 is connected to the gearbox input shaft 120, thereby transferring the torque load to the gearbox. Thus, the self-aligning roller bearing 140, the rear sliding thrust bearing 154, and the front sliding thrust bearing 152 together form the main shaft 110 bearing structure, which transfers all non-torsional loads to the main shaft 110 bearing and to the bearing housing 151. The bearing housing 151 is connected to the base of the entire unit, thereby transferring the load to the foundation.

[0046] When configuring the front sliding thrust pad 152, the fixed seat 153, and the rear sliding thrust pad 154, in order to enable the sliding bearing 150 to withstand the axial load, the front sliding thrust pad 152 and the rear sliding thrust pad 154 are located at both ends of the bearing housing 151 and the roller bearing 130 along the axial direction of the main shaft 110. Both the front sliding thrust pad 152 and the rear sliding thrust pad 154 are connected to the bearing housing 151, and the front sliding thrust pad 152 is used to contact the thrust surface 111. The fixed seat 153 is connected to the main shaft 110, and the fixed seat 153 and the rear sliding thrust pad 154 are located at the same end of the roller bearing 130. The fixed seat 153 is located between the rear sliding thrust pad 154 and the roller bearing 130, and the rear sliding thrust pad 154 is used to contact the fixed seat 153.

[0047] Therefore, the axial load of the main shaft 110 can be transmitted to the front sliding thrust bearing 152 and the rear sliding thrust bearing 154 through the thrust surface 111 and the fixed seat 153 of the main shaft 110, respectively. The front sliding thrust bearing 152 and the rear sliding thrust bearing 154 are evenly arranged in the circumferential direction. The main shaft 110 is equipped with a position screw-on mounting surface for mounting the fixed seat 153, and the fixed seat 153 abuts against the inner ring 141 of the bearing. This ensures that when the inner and outer rings of the self-aligning roller bearing 140 move relative to each other under load, the axial displacement generated is transmitted to the rear sliding thrust bearing 154 through the fixed seat 153, avoiding large axial movement of the self-aligning roller bearing 140 that could impact the gearbox input shaft 120, and also reducing the axial load bearing capacity of the self-aligning roller bearing 140.

[0048] In summary, the main shaft assembly 100 of this wind turbine adopts a bearing structure combining roller bearings 130 and sliding bearings 150. The roller bearings 130 mainly consist of roller bearings 130 and cylindrical roller bearings 130, primarily bearing radial forces, while the sliding bearings 150 primarily bear axial forces. By decomposing the axial and radial forces through different load paths, compared to using pure roller bearings 130, the bearing structure is smaller and has a higher load-bearing capacity under the same wind turbine power and impeller diameter. It can also accommodate more bearing specifications and models. The axial sliding bearings 150 have greater axial oil film stiffness, which can prevent axial wear on the rollers of the roller bearings 130 caused by axial floating.

[0049] It should be noted that, please refer to Figure 4 and combined Figures 1-3 This embodiment uses a single-support shaft system structure as an example for illustration. In other embodiments of the present invention, a double-support shaft system structure can also be adopted, in which two sets of roller bearings 130 and sliding bearings 150 are configured outside the main shaft 110. In addition, the surfaces of the front sliding thrust bearing 152 and the rear sliding thrust bearing 154 are both coated with wear-resistant material to ensure that the sliding bearing 150 is not damaged when there is no lubrication or little lubrication medium.

[0050] Furthermore, based on the above, please refer to... Figures 1-3 In this embodiment, when configuring the roller bearing 130, the self-aligning roller bearing 140 is used as an example for explanation. Thus, the roller bearing 130 includes an inner bearing ring 141, an outer bearing ring 142, and a plurality of bearing rollers 143. The inner bearing ring 141 is interference-fitted with the spindle 110, and the plurality of bearing rollers 143 are all disposed between the inner bearing ring 141 and the outer bearing ring 142. The outer bearing ring 142 is interference-fitted with the bearing housing 151, thereby improving the stability of the connection through the interference fit.

[0051] With this configuration, all radial forces borne by the spindle 110 are transmitted through the inner ring 141 of the self-aligning roller bearing 140 to the bearing rollers 143, and then to the outer ring 142. Since the rollers of the self-aligning roller bearing 140 have a spherical surface shape, during load transmission, the spherical rollers deform under load, causing relative misalignment between the outer ring 142 and the inner ring 141 of the self-aligning roller bearing 140. The magnitude of this misalignment depends on the bearing clearance (e.g., ...) of the self-aligning roller bearing 140. Figure 3 As shown in the design marked A, the self-aligning roller bearing 140 generates a certain axial force resistance due to the arc-shaped contact of the bearing rollers 143, thus enabling it to transmit part of the axial load.

[0052] Based on the above structural configuration, the wind turbine main shaft assembly 100 also includes a bearing inner ring spacer 161. The bearing inner ring spacer 161 is connected to the main shaft 110 and is located between the fixed seat 153 and the bearing inner ring 141, and abuts against the fixed seat 153 and the bearing inner ring 141. Thus, the bearing inner ring spacer 161 can be tightly fitted with the bearing inner ring 141 of the self-aligning roller bearing 140, ensuring that the axial displacement generated when the inner and outer rings of the self-aligning roller bearing 140 move relative to each other under load is transmitted through the fixed seat 153 to the rear sliding thrust bearing 154. This prevents the self-aligning roller bearing 140 from experiencing large axial movement that could impact the gearbox input shaft 120, and also reduces the axial load on the self-aligning roller bearing 140.

[0053] Further, please refer to Figures 1-5In this embodiment, the wind turbine main shaft assembly 100 further includes a front end cap 162 and a rear end cap 163. Along the axial direction of the main shaft 110, the front end cap 162 and the rear end cap 163 are located at both ends of the bearing housing 151 and are both connected to the bearing housing 151. The front sliding thrust bearing 152 is connected to the front end cap 162 or the bearing housing 151, and the rear sliding thrust bearing 154 is connected to the rear end cap 163. The rear sliding thrust bearing 154 is connected to the rear end cap 163. In this embodiment, the front sliding thrust bearing 152 and the rear sliding thrust bearing 154 are fixed to the front end cap 162 and the rear end cap 163 respectively. One side of the rear end cap 163 is in close contact with the end face of the bearing outer ring 142 of the self-aligning roller bearing 140, and the rear end cap 163 is provided with a supporting part 164 that abuts against the bearing outer ring 142.

[0054] Furthermore, based on the above structure, since the front end cap 162 and the rear end cap 163 are cantilever beam structures under the bearing load, they are prone to deformation. Therefore, the wind turbine main shaft assembly 100 also includes a connecting bolt 170. The axis of the connecting bolt 170 is parallel to the axis of the main shaft 110, and the connecting bolt 170 passes through the bearing housing 151 and connects the front end cap 162, the bearing housing 151 and the rear end cap 163. Therefore, by using connecting bolts to connect the front end cap 162 and the rear end cap 163 to the bearing housing 151 in a through-type manner, the rigidity of the front end cap 162 and the rear end cap 163 is improved. At the same time, in order to compensate for the uneven oil film pressure on the sliding contact surface of the front sliding thrust bearing 152 and the rear sliding thrust bearing 154 caused by the deformation of the cap cantilever beam, self-adjusting ribs are provided on the back of the front sliding thrust bearing 152 and the rear sliding thrust bearing 154. For example, the self-adjusting rib 169 of the front sliding thrust bearing adopts a circular arc contact and has a self-aligning function. It can also compensate for the uneven contact pressure of the bearing bearings at different positions caused by the different bearing force directions of the main shaft 110.

[0055] Specifically, to counteract the uneven oil film pressure on the sliding contact surface of the front sliding thrust bearing 152 and the rear sliding thrust bearing 154 caused by the deformation of the cantilever beam of the pressure cap, self-adjusting ribs are provided on the back of the front sliding thrust bearing 152 and the rear sliding thrust bearing 154. The self-adjusting ribs adopt arc contact and have a self-aligning function. They can also compensate for the uneven contact pressure of the bearings at different positions caused by the different bearing directions of the main shaft 110. Specifically, the wind turbine main shaft assembly 100 also includes a self-adjusting rib 169 with the front sliding thrust bearing and a self-adjusting rib with the rear sliding thrust bearing 154.

[0056] The front sliding thrust bearing self-adjusting rib 169 is connected to the front sliding thrust bearing 152 and is located between the contact surfaces of the front sliding thrust bearing 152 and the bearing seat 151, and the cross section of the contact surface between the front sliding thrust bearing self-adjusting rib 169 and the bearing seat 151 is arc-shaped.

[0057] The self-adjusting rib of the rear sliding thrust pad 154 is connected to the rear sliding thrust pad 154 and is located between the contact surfaces of the rear sliding thrust pad 154 and the rear end cover 163, and the cross section of the contact surface between the self-adjusting rib of the rear sliding thrust pad 154 and the rear end cover 163 is arc-shaped.

[0058] When the self-aligning roller bearing 140 is loaded, due to the bearing clearance, relative misalignment will occur between the outer ring 142 and the inner ring 141 of the self-aligning roller bearing 140. Therefore, to ensure that the self-aligning roller bearing 140 only bears radial load, it is required that the front sliding thrust bearing 152 form an oil film separation distance (e.g., ...) in the front sliding thrust bearing 152 bushing. Figure 3 (as shown by mark B) and the oil film separation distance formed by the rear sliding thrust bearing 154 liner (as shown by mark B) on the rear sliding thrust bearing 154 liner. Figure 3 The clearance (as indicated by the mark C) must be less than the bearing clearance. This clearance setting achieves bidirectional fixation of the inner ring of the self-aligning roller bearing 140, fulfilling the bearing positioning requirements. To form the aforementioned oil film separation distances A and C, the front sliding thrust bearing self-adjusting rib 169 has a first gap between its side facing the thrust surface 111 and the thrust surface 111 to form oil film separation distance A. Similarly, the rear sliding thrust bearing 154 self-adjusting rib has a second gap between its side facing the fixed seat 153 and the fixed seat 153 to form oil film separation distance C.

[0059] Further, please refer to Figures 1-5 In this embodiment, the wind turbine main shaft assembly 100 further includes a front sealing plate 165, a front sealing ring 166, a rear sealing plate 167, and a rear sealing ring 168. Along the axial direction of the main shaft 110, the front sealing plate 165 and the front sealing ring 166 are located at one end of the bearing housing 151, and the rear sealing plate 167 and the rear sealing ring 168 are located at the other end of the bearing housing 151. The front sealing plate 165 and the front sealing ring 166 are disposed between the front end cover 162 and the main shaft 110, and the rear sealing plate 167 and the rear sealing ring 168 are disposed between the rear end cover 163 and the main shaft 110. The purpose of this arrangement is to prevent the leakage of grease from the front sliding thrust bearing 152. Therefore, a front sealing plate 165 and a front sealing ring 166 are designed inside the front end cover 162. Similarly, to prevent the leakage of grease from the rear sliding thrust bearing 154, a sealing plate and a rear sealing ring 168 are designed inside the rear end cover 163.

[0060] Based on the aforementioned wind turbine main shaft assembly 100, please refer to... Figures 1-5 The present invention provides a wind turbine generator set, which includes the wind turbine generator set main shaft assembly 100 described above.

[0061] In summary, please refer to the following: Figures 1-5 The wind turbine main shaft assembly 100 and wind turbine generator provided in this embodiment have at least the following advantages:

[0062] The bearing adopts a combined bearing structure of roller bearing 130 and sliding bearing 150. The roller bearing 130 mainly consists of self-aligning roller bearing 140 and cylindrical roller bearing 130, which mainly bears the radial force of the bearing. The sliding bearing 150 mainly bears the axial load. By decomposing the axial and radial forces through different load paths, the bearing structure is smaller and can be matched with more bearing specifications and models under the same wind turbine power and impeller diameter.

[0063] The axial sliding bearing 150 has a greater stiffness in the oil film formed in the axial direction, which avoids axial floating and causes axial wear on the roller bearing 130.

[0064] The oil film separation distance A formed by the front sliding thrust bearing 152 and the oil film separation distance C formed by the rear sliding thrust bearing 154 and the rear sliding thrust bearing 154 are both smaller than the bearing clearance B. This ensures that the self-aligning roller bearing 140 only bears the radial load force, and the oil film stiffness formed in its axial direction is greater, avoiding axial floating and causing axial wear on the rollers of the roller bearing 130. By setting the clearance distance, the inner ring of the self-aligning roller bearing 140 is also fixed in both directions, which can meet the bearing positioning requirements.

[0065] Self-adjusting ribs are provided on the back of the front sliding thrust bearing 152 and the rear sliding thrust bearing 154. They adopt arc contact and have a self-aligning function. They can also compensate for the uneven contact pressure of the bearings at different positions caused by the different bearing directions of the main shaft 110.

[0066] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wind turbine main shaft assembly, characterized in that: The wind turbine main shaft assembly includes a main shaft, a gearbox input shaft, roller bearings, and sliding bearings; The main shaft is equipped with a thrust surface, and the gearbox input shaft is connected to the main shaft; the roller bearing is sleeved on the main shaft, and the roller bearing is a self-aligning roller bearing or a cylindrical roller bearing; The sliding bearing includes a bearing housing, a front sliding thrust pad, a fixed seat, and a rear sliding thrust pad. The bearing housing is sleeved on the outside of the roller bearing and rotatably connected to the main shaft through the roller bearing. The bearing housing is used to connect to the base of the wind turbine. Along the axial direction of the main shaft, the front sliding thrust pad and the rear sliding thrust pad are located at both ends of the bearing housing and the roller bearing, and both the front sliding thrust pad and the rear sliding thrust pad are connected to the bearing housing. The front sliding thrust pad is used to contact the thrust surface. The fixed seat is connected to the main shaft. The fixed seat and the rear sliding thrust pad are located at the same end of the roller bearing. The fixed seat is located between the rear sliding thrust pad and the roller bearing, and the rear sliding thrust pad is used to contact the fixed seat. The roller bearing includes an inner ring, an outer ring, and multiple rollers. The inner ring of the bearing is interference-fitted with the main shaft, and a plurality of bearing rollers are disposed between the inner ring and the outer ring of the bearing, and the outer ring of the bearing is interference-fitted with the bearing housing; The wind turbine main shaft assembly also includes a front end cap and a rear end cap; Along the axial direction of the main shaft, the front end cap and the rear end cap are located at both ends of the bearing housing and are both connected to the bearing housing; the front sliding thrust pad is connected to the front end cap or the bearing housing, and the rear sliding thrust pad is connected to the rear end cap; The wind turbine main shaft assembly also includes a front sliding thrust bearing self-adjusting rib and a rear sliding thrust bearing self-adjusting rib. The self-adjusting rib of the front sliding thrust bearing is connected to the front sliding thrust bearing and is located between the contact surfaces of the front sliding thrust bearing and the bearing seat, and the cross-section of the contact surface between the self-adjusting rib of the front sliding thrust bearing and the bearing seat is arc-shaped. The self-adjusting rib of the rear sliding thrust pad is connected to the rear sliding thrust pad and is located between the contact surfaces of the rear sliding thrust pad and the rear end cover, and the cross section of the contact surface between the self-adjusting rib of the rear sliding thrust pad and the rear end cover is arc-shaped. The front sliding thrust bearing self-adjusting rib is positioned with a first gap between the side of the front sliding thrust bearing facing the thrust surface and the thrust surface, and the rear sliding thrust bearing self-adjusting rib is positioned with a second gap between the side of the rear sliding thrust bearing facing the fixed seat and the fixed seat.

2. The wind turbine main shaft assembly according to claim 1, characterized in that: The wind turbine main shaft assembly also includes a bearing inner ring spacer, which is connected to the main shaft. The bearing inner ring spacer is located between the fixed seat and the bearing inner ring, and abuts against the fixed seat and the bearing inner ring.

3. The wind turbine main shaft assembly according to claim 1, characterized in that: The rear end cap is provided with a supporting portion that abuts against the outer ring of the bearing.

4. The wind turbine main shaft assembly according to claim 1, characterized in that: The wind turbine main shaft assembly also includes a front sealing plate, a front sealing ring, a rear sealing plate, and a rear sealing ring. Along the axial direction of the main shaft, the front sealing plate and the front sealing ring are located at one end of the bearing housing, and the rear sealing plate and the rear sealing ring are located at the other end of the bearing housing; the front sealing plate and the front sealing ring are disposed between the front end cover and the main shaft, and the rear sealing plate and the rear sealing ring are disposed between the rear end cover and the main shaft.

5. The wind turbine main shaft assembly according to claim 1, characterized in that: The wind turbine main shaft assembly also includes a connecting bolt, the axis of which is parallel to the axis of the main shaft, and the connecting bolt passes through the bearing housing and connects the front end cap, the bearing housing and the rear end cap.

6. A wind turbine generator set, characterized in that: The wind turbine generator set includes the wind turbine generator main shaft assembly as described in any one of claims 1-5.

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