Main transmission chain and wind generating set

Abstract

The embodiment of the invention provides a main transmission chain and a wind generating set, and relates to the technical field of wind power generation. The main transmission chain comprises a hub, a cabin casting, a main bearing, a main shaft, a gear box, a generator, a first fastener group and a second fastener group; the hub is connected with the cabin casting, the cabin casting is provided with a first mounting cavity, the main bearing is arranged in the first mounting cavity, the main shaft is sleeved with the main bearing, and the hub, the main shaft, the gearbox and the generator are sequentially connected; wherein the hub is simultaneously connected with the main shaft and the main bearing through the first fastener group, and the main bearing is connected with the cabin casting through the second fastener group; the generator is provided with a second mounting cavity, and the gearbox is at least partially arranged in the second mounting cavity. The torsional rigidity of a main transmission chain can be improved, the axial size and an impeller end non-torque load transmission path are reduced, torsional vibration to the main transmission chain during impeller operation is reduced, and therefore the operation stability and reliability of a unit are improved.

Description

A main drive train and a wind turbine generator set Technical Field

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

[0002] The main drive chain of a wind turbine generator set is the core component for power transmission. Its working principle is as follows: the impeller drives the main shaft to rotate, and the main shaft is connected to the input shaft of the gearbox through a coupling. After being accelerated by the gearbox, the output shaft drives the generator to run, thereby completing the conversion of mechanical energy into electrical energy.

[0003] However, for large-megawatt wind turbine generators that are offshore, onshore, or floating, the existing main drive train has problems such as insufficient torsional stiffness, large axial dimensions, and long non-torsional load transmission paths at the impeller end. These problems will exacerbate the torsional vibration of the main drive train and affect the operational stability and reliability of the unit. Summary of the Invention

[0004] The purpose of this invention is to provide a main drive train and a wind turbine generator set, which can improve the torsional stiffness of the main drive train, reduce the axial dimension and the non-torque load transmission path at the impeller end, reduce the torsional vibration of the main drive train during impeller operation, thereby improving the operating stability and reliability of the unit.

[0005] The embodiments of the present invention are implemented as follows: In a first aspect, the present invention provides a main drive train, including a hub, a nacelle casting, a main bearing, a main shaft, a gearbox, a generator, a first fastener group, and a second fastener group; the hub is connected to the nacelle casting, the nacelle casting has a first mounting cavity, the main bearing is disposed in the first mounting cavity, and the main bearing is sleeved on the main shaft, the hub, the main shaft, the gearbox, and the generator are connected in sequence; wherein, the hub is connected to both the main shaft and the main bearing through the first fastener group, and the main bearing is connected to the nacelle casting through the second fastener group; the generator has a second mounting cavity, and the gearbox is at least partially disposed in the second mounting cavity.

[0006] In an optional embodiment, the main bearing includes an inner bearing ring, bearing rollers, and an outer bearing ring. The inner bearing ring is fitted onto the main shaft, and the bearing rollers are disposed between the inner bearing ring and the outer bearing ring. The hub is connected to both the main shaft and the inner bearing ring via a first set of fasteners, and the outer bearing ring is connected to the engine room casting via a second set of fasteners.

[0007] In an optional embodiment, the generator includes an outer rotor and an inner stator. The outer rotor is connected to the gearbox. The outer rotor is provided with a second mounting cavity. The gearbox is at least partially disposed in the second mounting cavity. The inner stator is disposed in the second mounting cavity and is connected to the gearbox.

[0008] In an optional embodiment, the gearbox includes a primary ring gear, a primary planetary gear train, a secondary ring gear, a secondary planetary gear train, and an output shaft. The primary ring gear meshes with the primary planetary gear train, and the secondary ring gear meshes with the secondary planetary gear train. The primary planetary gear train, the secondary planetary gear train, and the output shaft are connected in sequence. The output shaft is disposed within the second mounting cavity, and the outer rotor is connected to the output shaft. The main drive chain further includes a third fastener group and a fourth fastener group. The primary ring gear is connected to the engine compartment casting through the third fastener group, and the primary planetary gear train is connected to the main shaft through the fourth fastener group.

[0009] In an optional embodiment, the gearbox further includes a third-stage ring gear, a third-stage planetary gear train, and a generator end cover. The third-stage ring gear meshes with the third-stage planetary gear train, and the first-stage planetary gear train, the second-stage planetary gear train, the third-stage planetary gear train, and the output shaft are connected in sequence. The generator end cover is connected to the third-stage ring gear, and the third-stage ring gear, the third-stage planetary gear train, and the generator end cover are all disposed within the second mounting cavity. The main drive chain further includes a fifth set of fasteners, and the generator end cover is connected to the inner stator through the fifth set of fasteners.

[0010] In an optional embodiment, the generator further includes an oil pipe disposed within the second mounting cavity; the inner stator is provided with a lubricating oil cavity, and the lubricating oil cavity, the oil pipe, and the gearbox are sequentially connected.

[0011] In an optional embodiment, the generator further includes a brake disc disposed on the side of the outer rotor near the nacelle casting; the main drive chain further includes a brake disposed in the gearbox and used to cooperate with the brake disc.

[0012] In an optional embodiment, the second fastener group is a connecting bolt group, and the mounting nuts of the connecting bolt group are located on the side of the nacelle casting closer to the generator.

[0013] In an optional embodiment, the nacelle casting is provided with a brake pin seat, and the main shaft is provided with a brake pin hole, the brake pin hole being used to cooperate with the brake pin seat.

[0014] Secondly, the present invention provides a wind turbine generator set, including the main drive train described in any of the foregoing embodiments.

[0015] The beneficial effects of this embodiment of the invention include: the main drive train provided in this embodiment connects the hub to both the main shaft and the main bearing via a first set of fasteners, and connects the main bearing to the nacelle casting via a second set of fasteners. This allows all non-torsional loads generated by the hub to be directly transmitted to the nacelle casting via the main shaft and the main bearing, thereby reducing the transmission path of non-torsional loads at the impeller end and improving the torsional stiffness of the main drive train. Furthermore, by at least partially locating the gearbox within the second mounting cavity of the generator, the overall axial dimension of the main drive train can be reduced. In other words, through the synergistic cooperation of the above structures, the torsional vibration of the main drive train during impeller operation can be reduced, thereby improving the operational stability and reliability of the unit.

[0016] A wind turbine generator set includes a main drive train, which has all the beneficial effects of that main drive train. Attached Figure Description

[0017] 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.

[0018] Figure 1 is a structural schematic diagram of the wind turbine generator set provided in an embodiment of the present invention; Figure 2 is a partial cross-sectional view of the wind turbine generator set provided in an embodiment of the present invention; Figure 3 is a partial enlarged view of point A in Figure 2; Figure 4 is a partial enlarged view of point B in Figure 2; Figure 5 is a structural schematic diagram of the gearbox provided in an embodiment of the present invention.

[0019] Icons: 1000 - Wind turbine generator set; 100 - Main drive train; 10 - Hub; 20 - Nacelle casting; 21 - First mounting cavity; 22 - Brake pin seat; 30 - Main bearing; 31 - Inner bearing ring; 32 - Bearing roller; 33 - Outer bearing ring; 40 - Main shaft; 41 - Brake pin hole; 50 - Gearbox; 51 - First-stage gear ring; 52 - First-stage planetary gear train; 53 - Second-stage gear ring; 54 - Second-stage planetary gear train; 55 - Third-stage gear ring; 56 - Third-stage planetary gear train ; 57-Generator end cover; 58-Output shaft; 60-Generator; 61-Second mounting cavity; 62-Outer rotor; 63-Inner stator; 631-Lubricating oil cavity; 64-Oil pipe; 65-Brake disc; 71-First fastener group; 72-Second fastener group; 73-Third fastener group; 74-Fourth fastener group; 75-Fifth fastener group; 80-Brake; 200-Nacelle cover; 300-Yaw system; 400-Maintenance platform; 500-Control cabinet. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. 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. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] As described in the background section, existing main drive trains for offshore, onshore, and floating large-megawatt wind turbine generators suffer from insufficient torsional stiffness, large axial dimensions, and long non-torsional load transmission paths at the rotor end. These problems exacerbate torsional vibrations in the main drive train, affecting the operational stability and reliability of the unit.

[0027] Based on this, please refer to Figures 1-5. Embodiments of the present invention provide a main drive train 100 and a wind turbine generator set 1000, which can effectively improve the aforementioned technical problems. Specifically, it can increase the torsional stiffness of the main drive train 100, reduce the axial dimension and the non-torque load transmission path at the impeller end, and reduce the torsional vibration of the main drive train 100 during impeller operation, thereby improving the operational stability and reliability of the unit. The main drive train 100 and the wind turbine generator set 1000 will be described in detail below.

[0028] Please refer to Figures 1 and 2. Figure 1 is a structural schematic diagram of the wind turbine generator set 1000 provided in this embodiment, and Figure 2 is a partial cross-sectional view of the wind turbine generator set 1000 provided in this embodiment. In conjunction with Figures 1 and 2, the wind turbine generator set 1000 includes a main drive chain 100 and a nacelle cover 200, and a part of the main drive chain 100 is disposed inside the nacelle cover 200.

[0029] Furthermore, in this embodiment, the wind turbine generator set 1000 also includes a yaw system 300, a maintenance platform 400, and a control cabinet 500. The main drive train 100, the yaw system 300, and the control cabinet 500 are all located on the maintenance platform 400. The yaw system 300 can adjust the direction of the nacelle and the wind turbine in real time so that they are always facing the prevailing wind direction, thereby maximizing wind energy capture and improving power generation efficiency. By setting up the maintenance platform 400, it is convenient to maintain the main drive train 100. The control cabinet 500 makes it easy for operators to control the operation of the unit.

[0030] Of course, it is easy for those skilled in the art to know that the wind turbine generator set 1000 also includes impellers, pitch control systems, etc., which will not be described in detail in this embodiment.

[0031] Please refer to Figures 3 and 4. Figure 3 is a partial enlarged view of point A in Figure 2, and Figure 4 is a partial enlarged view of point B in Figure 2. Combining Figures 1-4, the main drive train 100 includes a hub 10, a nacelle casting 20, a main bearing 30, a main shaft 40, a gearbox 50, a generator 60, a first fastener group 71, and a second fastener group 72. The hub 10 is connected to the nacelle casting 20, which has a first mounting cavity 21. The main bearing 30 is disposed within the first mounting cavity 21 and is fitted onto the main shaft 40. The hub 10, main shaft 40, gearbox 50, and generator 60 are connected sequentially. The hub 10 is connected to both the main shaft 40 and the main bearing 30 via the first fastener group 71, and the main bearing 30 is connected to the nacelle casting 20 via the second fastener group 72. The generator 60 has a second mounting cavity 61, and the gearbox 50 is at least partially disposed within the second mounting cavity 61.

[0032] It is easy to understand that by connecting the hub 10 to both the main shaft 40 and the main bearing 30 via the first fastener group 71, and connecting the main bearing 30 to the nacelle casting 20 via the second fastener group 72, all non-torsional loads generated by the hub 10 can be directly transmitted to the nacelle casting 20 through the main shaft 40 and the main bearing 30. This reduces the transmission path of non-torsional loads at the impeller end and increases the torsional stiffness of the main drive train 100. Furthermore, by at least partially locating the gearbox 50 within the second mounting cavity 61 of the generator 60, the overall axial dimension of the main drive train 100 can be reduced. In other words, through the synergistic cooperation of the above structures, the torsional vibration of the main drive train 100 during impeller operation can be reduced, thereby improving the operational stability and reliability of the unit.

[0033] It should be noted that, specifically in this embodiment, the second fastener group 72 is a connecting bolt group. The mounting nut of the connecting bolt group is located on the side of the engine room casting 20 near the generator 60, that is, the mounting nut faces the maintenance platform 400. This facilitates the later maintenance and replacement of the second fastener group 72 and improves maintenance efficiency.

[0034] Referring to Figure 3, specifically, the main bearing 30 includes an inner bearing ring 31, bearing rollers 32, and an outer bearing ring 33. The inner bearing ring 31 is fitted onto the main shaft 40, and the bearing rollers 32 are disposed between the inner bearing ring 31 and the outer bearing ring 33. The hub 10 is connected to both the main shaft 40 and the inner bearing ring 31 via a first set of fasteners 71, and the outer bearing ring 33 is connected to the engine room casting 20 via a second set of fasteners 72.

[0035] It is understandable that the non-torsional load generated by the hub 10 can be transmitted sequentially to the nacelle casting 20 through the main shaft 40, the inner bearing ring 31, the bearing roller 32, and the outer bearing ring 33, thereby reducing the transmission path of the non-torsional load at the impeller end, increasing the torsional stiffness of the main drive chain 100, reducing the vibration response of the impeller operation to the main drive chain 100, and thus improving the operational stability and reliability of the unit.

[0036] Referring to Figure 4, specifically, the generator 60 includes an outer rotor 62 and an inner stator 63. The outer rotor 62 is connected to the gearbox 50. The outer rotor 62 is provided with a second mounting cavity 61. The gearbox 50 is at least partially disposed in the second mounting cavity 61. The inner stator 63 is disposed in the second mounting cavity 61 and is connected to the gearbox 50.

[0037] In other words, the generator 60 provided in this embodiment is an external rotor generator. By placing the stator of the generator 60 inside the rotor and increasing the diameter of the external rotor 62, with its opening extending towards the gearbox 50, a portion of the gearbox 50 is housed inside the external rotor 62, i.e., within the second mounting cavity 61. This shortens the distance between the tail end of the generator 60 and the fixed connection position of the main bearing 30. Thus, on the one hand, the overall axial dimension of the main drive train 100 can be reduced, improving the overall structural strength; on the other hand, under the same rotational speed, the power generation efficiency of the generator 60 can be improved.

[0038] Please refer to Figure 5, which is a structural schematic diagram of the gearbox 50 provided in this embodiment. Referring to Figures 3-5, specifically, the gearbox 50 includes a primary gear ring 51, a primary planetary gear train 52, a secondary gear ring 53, a secondary planetary gear train 54, and an output shaft 58. The primary gear ring 51 meshes with the primary planetary gear train 52, and the secondary gear ring 53 meshes with the secondary planetary gear train 54. The primary planetary gear train 52, the secondary planetary gear train 54, and the output shaft 58 are connected sequentially. The output shaft 58 is disposed within the second mounting cavity 61, and the outer rotor 62 is connected to the output shaft 58. The main drive train 100 also includes a third fastener group 73 and a fourth fastener group 74. The primary gear ring 51 is connected to the engine compartment casting 20 via the third fastener group 73, and the primary planetary gear train 52 is connected to the main shaft 40 via the fourth fastener group 74.

[0039] By setting the third fastener group 73 and the fourth fastener group 74, the connection strength between the gearbox 50 and the nacelle casting 20 and the main shaft 40 can be improved, the torsional vibration of the main drive chain 100 can be reduced, and the operational stability of the unit can be improved.

[0040] Furthermore, the gearbox 50 also includes a third-stage ring gear 55, a third-stage planetary gear train 56, and a generator end cover 57. The third-stage ring gear 55 meshes with the third-stage planetary gear train 56, and the first-stage planetary gear train 52, the second-stage planetary gear train 54, the third-stage planetary gear train 56, and the output shaft 58 are connected in sequence. The generator end cover 57 is connected to the third-stage ring gear 55, and the third-stage ring gear 55, the third-stage planetary gear train 56, and the generator end cover 57 are all located in the second mounting cavity 61. The main drive chain 100 also includes a fifth fastener group 75, and the generator end cover 57 is connected to the inner stator 63 through the fifth fastener group 75.

[0041] It is easy to understand that the torque generated by the hub 10 is transmitted to the gearbox 50. The gearbox 50 forms the first speed increase through the first-stage ring gear 51 and the first-stage planetary gear train 52, then forms the second-stage speed increase through the second-stage ring gear 53 and the second-stage planetary gear train 54, and then forms the third-stage speed increase through the third-stage ring gear 55 and the third-stage planetary gear train 56. Finally, the torque is output through the output shaft 58. The output shaft 58 is connected to the outer rotor 62 of the generator 60, which increases the speed of the generator 60, thereby reducing the requirement for the motor diameter. As the power level of the unit gradually increases, the axial length of the gearbox 50, which consists of the first, second, and third-stage speed increases, will increase, and the vibration transmitted to the generator 60 at the end will have a greater impact.

[0042] Therefore, in this embodiment, the first-stage gear ring 51 is fixed to the nacelle casting 20 by the third fastener group 73. Simultaneously, the generator 60 is arranged with the outer rotor 62 on the outside and the inner stator 63 on the inside, avoiding axial elongation of the motor. Furthermore, the third-stage gear ring 55, the third-stage planetary gear train 56, and the generator end cover 57 are all housed within the second mounting cavity 61 of the generator 60, which significantly reduces the axial dimension and increases the torsional stiffness of the main drive train 100. This reduces the torsional vibration of the main drive train 100 during impeller operation, improving the unit's operational stability and reliability.

[0043] It should be noted that in this embodiment, the first fastener group 71, the second fastener group 72, the third fastener group 73, the fourth fastener group 74, and the fifth fastener group 75 are all connecting bolt groups, which include multiple connecting bolts and can improve the connection stability of the related structures. Of course, in other embodiments, the fastener group can also be other fastening structures.

[0044] Referring to Figure 4, the generator 60 also includes an oil pipe 64, which is disposed within the second mounting cavity 61. The inner stator 63 has a lubrication oil cavity 631, and the lubrication oil cavity 631, oil pipe 64, and gearbox 50 are sequentially connected. By coordinating the oil pipe 64 with the lubrication oil cavity 631, the inner stator 63 and gearbox 50 can share the same lubricating oil for cooling, improving the lubrication and cooling effect. Furthermore, this arrangement can also improve the integration of the unit to a certain extent, reduce the number of parts, and further shorten the size of the main drive train 100, thereby improving the operational stability of the unit.

[0045] Furthermore, the generator 60 also includes a brake disc 65, which is disposed on the side of the outer rotor 62 near the nacelle casting 20; the main drive chain 100 also includes a brake 80, which is disposed in the gearbox 50 and is used to cooperate with the brake disc 65 to brake the outer rotor 62, thereby realizing the braking operation of the unit.

[0046] In addition, referring to Figure 1, in order to lock the hub 10, in this embodiment, the engine compartment casting 20 is provided with a brake pin seat 22, and the main shaft 40 is provided with a brake pin hole 41, which is used to cooperate with the brake pin seat 22.

[0047] In summary, embodiments of the present invention provide a main drive train 100 and a wind turbine generator set 1000. The main drive train 100 includes a hub 10, a nacelle casting 20, a main bearing 30, a main shaft 40, a gearbox 50, a generator 60, a first fastener group 71, and a second fastener group 72. The hub 10 is connected to the nacelle casting 20, which has a first mounting cavity 21. The main bearing 30 is disposed within the first mounting cavity 21 and is fitted onto the main shaft 40. The hub 10, main shaft 40, gearbox 50, and generator 60 are connected sequentially. The hub 10 is connected to both the main shaft 40 and the main bearing 30 via the first fastener group 71, and the main bearing 30 is connected to the nacelle casting 20 via the second fastener group 72. The generator 60 has a second mounting cavity 61, and the gearbox 50 is at least partially disposed within the second mounting cavity 61. By connecting the hub 10 to both the main shaft 40 and the main bearing 30 using the first fastener group 71, and simultaneously connecting the main bearing 30 to the nacelle casting 20 using the second fastener group 72, all non-torsional loads generated by the hub 10 can be directly transmitted to the nacelle casting 20 through the main shaft 40 and the main bearing 30. This reduces the transmission path of non-torsional loads at the impeller end and improves the torsional stiffness of the main drive train 100. Furthermore, by at least partially locating the gearbox 50 within the second mounting cavity 61 of the generator 60, the overall axial dimension of the main drive train 100 can be reduced. Through the synergistic cooperation of these structures, the torsional vibration of the main drive train 100 during impeller operation can be reduced, thereby improving the operational stability and reliability of the unit.

[0048] The wind turbine generator set 1000 includes a main drive train 100, which has all the functions and benefits of the main drive train 100.

[0049] The above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A main drive train, characterized in that, The system includes a hub (10), a nacelle casting (20), a main bearing (30), a main shaft (40), a gearbox (50), a generator (60), a first fastener group (71), and a second fastener group (72). The hub (10) is connected to the nacelle casting (20), which has a first mounting cavity (21). The main bearing (30) is disposed in the first mounting cavity (21) and fitted onto the main shaft (40). The main shaft (40), the gearbox (50), and the generator (60) are connected in sequence; wherein, the hub (10) is connected to both the main shaft (40) and the main bearing (30) through the first fastener group (71), and the main bearing (30) is connected to the nacelle casting (20) through the second fastener group (72); the generator (60) is provided with a second mounting cavity (61), and the gearbox (50) is at least partially disposed in the second mounting cavity (61).

2. The main drive train according to claim 1, characterized in that, The main bearing (30) includes an inner bearing ring (31), a bearing roller (32), and an outer bearing ring (33). The inner bearing ring (31) is fitted onto the main shaft (40), and the bearing roller (32) is disposed between the inner bearing ring (31) and the outer bearing ring (33). The hub (10) is connected to both the main shaft (40) and the inner bearing ring (31) via the first fastener group (71), and the outer bearing ring (33) is connected to the engine room casting (20) via the second fastener group (72).

3. The main drive train according to claim 1, characterized in that, The generator (60) includes an outer rotor (62) and an inner stator (63). The outer rotor (62) is connected to the gearbox (50). The outer rotor (62) is provided with a second mounting cavity (61). The gearbox (50) is at least partially disposed in the second mounting cavity (61). The inner stator (63) is disposed in the second mounting cavity (61) and is connected to the gearbox (50).

4. The main drive train according to claim 3, characterized in that, The gearbox (50) includes a primary gear ring (51), a primary planetary gear train (52), a secondary gear ring (53), a secondary planetary gear train (54), and an output shaft (58). The primary gear ring (51) meshes with the primary planetary gear train (52), and the secondary gear ring (53) meshes with the secondary planetary gear train (54). The primary planetary gear train (52), the secondary planetary gear train (54), and the output shaft (58) are connected in sequence. The output shaft (58) is located in the second mounting cavity (61), and the outer rotor (62) is connected to the output shaft (58). The main drive chain (100) also includes a third fastener group (73) and a fourth fastener group (74). The primary gear ring (51) is connected to the engine room casting (20) through the third fastener group (73), and the primary planetary gear train (52) is connected to the main shaft (40) through the fourth fastener group (74).

5. The main drive train according to claim 4, characterized in that, The gearbox (50) further includes a third-stage gear ring (55), a third-stage planetary gear train (56), and a generator end cover (57). The third-stage gear ring (55) meshes with the third-stage planetary gear train (56). The first-stage planetary gear train (52), the second-stage planetary gear train (54), the third-stage planetary gear train (56), and the output shaft (58) are connected in sequence. The generator end cover (57) is connected to the third-stage gear ring (55), and the third-stage gear ring (55), the third-stage planetary gear train (56), and the generator end cover (57) are all located in the second mounting cavity (61). The main drive chain (100) further includes a fifth fastener group (75), and the generator end cover (57) is connected to the inner stator (63) through the fifth fastener group (75).

6. The main drive train according to claim 3, characterized in that, The generator (60) also includes an oil pipe (64), which is disposed in the second mounting cavity (61); the inner stator (63) is provided with a lubricating oil cavity (631), and the lubricating oil cavity (631), the oil pipe (64) and the gearbox (50) are connected in sequence.

7. The main drive train according to claim 3, characterized in that, The generator (60) also includes a brake disc (65), which is disposed on the side of the outer rotor (62) near the nacelle casting (20); the main drive chain (100) also includes a brake (80), which is disposed on the gearbox (50) and is used to cooperate with the brake disc (65).

8. The main drive train according to any one of claims 1-7, characterized in that, The second fastener group (72) is a connecting bolt group, and the mounting nuts of the connecting bolt group are located on the side of the nacelle casting (20) near the generator (60).

9. The main drive train according to any one of claims 1-7, characterized in that, The engine room casting (20) is provided with a brake pin seat (22), and the main shaft (40) is provided with a brake pin hole (41), which is used to cooperate with the brake pin seat (22).

10. A wind turbine generator set, characterized in that, Includes the main drive train (100) as described in any one of claims 1-9.

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