Multi-stage planetary transmission doubly-fed wind power gear box integrated with transmission chain

Abstract

The invention provides a multi-stage planetary transmission double-fed wind power gear box integrated with a transmission chain, which relates to the technical field of wind power gear boxes and comprises a main shaft, a main shaft upwind bearing, a bearing seat, a main shaft downwind bearing, a first-stage planetary transmission structure, a second-stage planetary transmission structure, a third-stage planetary transmission structure, a fourth-stage parallel shaft transmission structure and a box body, the first-stage planetary transmission structure, the second-stage planetary transmission structure, the third-stage planetary transmission structure and the fourth-stage parallel shaft transmission structure are installed on the box body, the main shaft is assembled and connected with the bearing seat through the main shaft upwind bearing and the main shaft downwind bearing, one side of the main shaft is connected with the hub, and the other side of the main shaft is connected with the first-stage planetary transmission structure; the first-stage planetary transmission structure, the second-stage planetary transmission structure, the third-stage planetary transmission structure and the fourth-stage parallel shaft transmission structure are sequentially connected, and the fourth-stage parallel shaft transmission structure is connected with the generator. A three-stage planet and one-stage parallel shaft transmission structure is adopted, the structure is compact, the whole machine weight is light, the transmission ratio is large, and the transmission efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of wind turbine gearbox technology, and more particularly to a multi-stage planetary transmission doubly fed wind turbine gearbox with an integrated transmission chain. Background Technology

[0002] Wind power generation, as a clean and renewable energy source, has received widespread attention in recent years. The wind turbine gearbox is one of the most crucial components of a wind turbine generator set. With the rapid development of wind power generation, the megawatt-level capacity of wind turbine gearboxes is constantly increasing, and smaller units are continuously being replaced by larger ones. This leads to a continuous increase in the weight and volume of gearboxes, significantly increasing the costs of production, processing, transportation, and installation. Furthermore, the space within the nacelle is limited. How to achieve a gearbox capable of transmitting greater torque within a given space constraint is a key issue for gearbox designers. Against this backdrop, lightweight, compact, and integrated transmission chain gearboxes clearly offer significant advantages. Summary of the Invention

[0003] In response to the aforementioned technical problems, a multi-stage planetary doubly fed wind turbine gearbox with an integrated transmission chain is provided.

[0004] The technical means employed in this invention are as follows: A multi-stage planetary transmission doubly-fed wind turbine gearbox with integrated transmission chain includes: a main shaft, an upper windward bearing on the main shaft, a bearing housing, a lower windward bearing on the main shaft, a first-stage planetary transmission structure, a second-stage planetary transmission structure, a third-stage planetary transmission structure, a fourth-stage parallel shaft transmission structure, and a housing. The first-stage, second-stage, third-stage, and fourth-stage planetary transmission structures are all mounted on the housing. The main shaft is connected to the bearing housing via the upper and lower windward bearings. One side of the main shaft is connected to a hub, and the other side is connected to the input end of the first-stage planetary transmission structure. The output end of the first-stage planetary transmission structure is connected to the input end of the second-stage planetary transmission structure, the output end of the second-stage planetary transmission structure is connected to the input end of the third-stage planetary transmission structure, and the output end of the third-stage planetary transmission structure is connected to the input end of the fourth-stage parallel shaft transmission structure. The output end of the fourth-stage parallel shaft transmission structure is used to connect to a generator.

[0005] Furthermore, the housing includes housing one, housing two, housing three, and a rear housing. The first-stage planetary transmission structure is installed and connected to the bearing housing and housing one. The second-stage planetary transmission structure is installed and connected to housing one and housing two. The third-stage planetary transmission structure is installed and connected to housing two and housing three. The fourth-stage parallel shaft transmission structure is installed and connected to housing three and the rear housing.

[0006] Furthermore, the primary planetary transmission structure includes a primary planetary carrier, a primary sun gear, primary planetary gears, primary planetary gear shafts, primary planetary gear bearings, and a primary ring gear. The primary planetary carrier is connected to the main shaft. The windward side of the primary ring gear is fixedly connected to the outer ring of the bearing housing, and the leeward side of the primary ring gear is fixedly connected to the housing. Multiple primary planetary gear shafts distributed circumferentially are connected to the primary planetary carrier. Each primary planetary gear shaft is connected to a primary planetary gear through a primary planetary gear bearing. The multiple primary planetary gears are located inside the primary ring gear, and the primary sun gear is located at the center of the multiple primary planetary gears. The multiple primary planetary gears mesh with the primary ring gear and the primary sun gear. The multiple primary planetary gears rotate around the multiple primary planetary gear shafts as their centers and simultaneously revolve around the primary sun gear, driving the primary sun gear to rotate. The output end of the primary sun gear is connected to the input end of the secondary planetary transmission structure.

[0007] Furthermore, the secondary planetary transmission structure includes a secondary planetary carrier, an upper windward bearing of the secondary planetary carrier, a secondary sun gear, secondary planetary gears, a secondary planetary gear shaft, a secondary planetary gear bearing, a secondary gear ring, and a lower windward bearing of the secondary planetary carrier. The upper windward side of the secondary gear ring is fixedly connected to housing one, and the lower windward side of the secondary gear ring is fixedly connected to housing two. The external spline of the secondary planetary carrier is connected to the primary sun gear of the primary planetary transmission structure through an internal spline. The upper windward side of the secondary planetary carrier is connected to housing one through the upper windward bearing of the secondary planetary carrier, and the lower windward side of the secondary planetary carrier is connected to housing two through the lower windward bearing of the secondary planetary carrier. Multiple secondary planetary gear shafts are connected to the secondary planetary carrier. Each secondary planetary gear shaft is connected to a secondary planetary gear via a secondary planetary gear bearing. The multiple secondary planetary gears are located inside the secondary gear ring. The secondary sun gear is located at the center of the multiple secondary planetary gears. The multiple secondary planetary gears are meshed with the secondary gear ring and the secondary sun gear. The multiple secondary planetary gears rotate around the multiple secondary planetary gear shafts as their centers and revolve around the secondary sun gear, driving the secondary sun gear to rotate. The output end of the secondary sun gear is connected to the input end of the three-stage planetary transmission structure.

[0008] Furthermore, the three-stage planetary transmission structure includes a three-stage planetary carrier, an upper windward bearing of the three-stage planetary carrier, a lower windward bearing of the three-stage planetary carrier, a three-stage sun gear, three-stage planetary gears, a three-stage planetary gear shaft, a three-stage planetary gear bearing, and a three-stage gear ring. The upper windward side of the three-stage gear ring is fixedly connected to housing two, and the lower windward side of the three-stage gear ring is fixedly connected to housing three. The external spline of the three-stage planetary carrier is connected to the secondary sun gear of the two-stage planetary transmission structure through the internal spline. The upper windward side of the three-stage planetary carrier is connected to housing two through the upper windward bearing of the three-stage planetary carrier, and the lower windward side of the three-stage planetary carrier is connected to housing three through the lower windward bearing of the three-stage planetary carrier. The three-stage planetary carrier is connected to multiple three-stage planetary gear shafts. Each three-stage planetary gear shaft is connected to a three-stage planetary gear via a three-stage planetary gear bearing. The multiple three-stage planetary gears are located inside the three-stage gear ring. The three-stage sun gear is located at the center of the multiple three-stage planetary gears. The multiple three-stage planetary gears are meshed with the three-stage gear ring and the three-stage sun gear. The multiple three-stage planetary gears rotate around the multiple three-stage planetary gear shafts as their centers and revolve around the three-stage sun gear, driving the three-stage sun gear to rotate. The output end of the three-stage sun gear is connected to the input end of the four-stage parallel shaft transmission structure.

[0009] Furthermore, the four-stage parallel shaft transmission structure includes a hollow shaft, an upper windward bearing for the large gear, the large gear, a lower windward bearing for the large gear, an upper windward bearing for the high-speed shaft, a high-speed shaft, and a lower windward bearing for the high-speed shaft. The internal spline of the hollow shaft is connected to the third-stage sun gear of the three-stage planetary transmission structure via an external spline. The upper windward side of the large gear is connected to the housing via the upper windward bearing for the large gear, and the lower windward side of the large gear is connected to the rear housing via the lower windward bearing for the large gear. The hollow shaft is interference-fitted with the large gear, and the large gear is meshed with the high-speed shaft. The upper windward side of the high-speed shaft is connected to the housing via the upper windward bearing for the high-speed shaft, and the lower windward side of the high-speed shaft is connected to the rear housing via the lower windward bearing for the high-speed shaft. The rotation of the third-stage sun gear drives the rotation of the large gear, which in turn drives the rotation of the high-speed shaft.

[0010] Furthermore, the outer ring of the first-stage planetary carrier is provided with a positioning outer stop, and the corresponding position of the housing is provided with a positioning inner stop.

[0011] Furthermore, the internal spline of the first-stage sun gear adopts a short spline structure, and there is a space between the windward side of the internal spline of the first-stage sun gear and the stop of the first-stage sun gear. The internal spline of the first-stage sun gear is machined by milling.

[0012] Furthermore, the two ends of the three-stage gear ring are designed as an externally extending flange structure, including a first flange structure and a second flange structure. The first flange structure is connected to the housing two by multiple bolts, and the second flange structure is connected to the housing three by multiple pins. There is a space between the first flange structure and the second flange structure, and the multiple bolts and multiple pins are staggered.

[0013] Furthermore, the two sides of the windward bearing on the high-speed shaft are axially fixed by the upper end cover and the lower end cover. The upper end cover and the lower end cover are both fixed to the housing three by bolts. A viewing window is opened on the housing three near the windward bearing on the high-speed shaft. A viewing window cover plate is provided at the viewing window. The viewing window cover plate is fixed to the housing three by bolts.

[0014] Furthermore, both the upper and lower end caps are equipped with oil passages for simultaneously spraying oil into the windward bearings on the high-speed shaft from the internal oil passages on both sides.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The multi-stage planetary transmission doubly fed wind turbine gearbox with integrated transmission chain provided by the present invention adopts a three-stage planetary transmission plus a one-stage parallel shaft transmission structure, which is compact, lightweight, has a large transmission ratio, and high transmission efficiency.

[0016] 2. The multi-stage planetary transmission doubly fed wind turbine gearbox with integrated transmission chain provided by the present invention adopts the planetary carrier outer ring side stop positioning for the first time in the assembly of the first-stage planetary carrier transmission structure, which solves the assembly problem of the lack of upper and lower wind direction bearing positioning in the first-stage planetary carrier transmission structure of the front integrated gearbox.

[0017] 3. The multi-stage planetary transmission doubly fed wind turbine gearbox with integrated transmission chain provided by the present invention has a special design on the internal spline of the first-stage sun gear, which adopts a short spline. While ensuring strength, it can also ensure that the internal spline can be milled, shortening the internal spline machining time and improving production efficiency.

[0018] 4. The multi-stage planetary transmission doubly fed wind turbine gearbox with integrated transmission chain provided by the present invention has a special design in the structure of the three-stage gear ring, and adopts an externally extended flange structure at both ends to provide sufficient space for bolt disassembly, ensuring that the three-stage gear ring connecting bolts can be replaced in the nacelle.

[0019] 5. The multi-stage planetary transmission doubly fed wind turbine gearbox with integrated transmission chain provided by the present invention has a special design in the fixing structure of the wind direction bearing on the high-speed shaft. It uses the upper end cover and the lower end cover to fix the bearing with bolts, which can directly remove the wind direction bearing on the high-speed shaft from the rear end of the high-speed shaft, making it easy to replace the bearing. The upper end cover and the lower end cover are provided with oil passages, which can simultaneously spray oil to lubricate the wind direction bearing on the high-speed shaft from both ends, ensuring lubrication efficiency.

[0020] Based on the above reasons, this invention can be widely promoted in fields such as large-megawatt wind turbine generator sets. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the first-stage planetary transmission structure of the present invention.

[0024] Figure 3 This is a schematic diagram of the two-stage planetary transmission structure of the present invention.

[0025] Figure 4 This is a schematic diagram of the three-stage planetary transmission structure of the present invention.

[0026] Figure 5 This is a schematic diagram of the four-stage parallel shaft transmission structure of the present invention.

[0027] Figure 6 This is a schematic diagram of the assembly of the first-stage planetary transmission structure of the present invention.

[0028] Figure 7 This is a schematic diagram of the assembly positioning stop of the first-stage planetary carrier of the present invention.

[0029] Figure 8 This is a schematic diagram of the spline structure inside the first-stage sun gear of the present invention.

[0030] Figure 9 This is a schematic diagram of the three-stage gear ring connection structure of the present invention.

[0031] Figure 10 This is a schematic diagram of the windward bearing fixing structure on the high-speed shaft of the present invention.

[0032] In the diagram: 1. Hub; 2. Main shaft; 3. Upper windward bearing of the main shaft; 4. Bearing housing; 5. Lower windward bearing of the main shaft; 6. First-stage planetary transmission structure; 7. Housing 1; 8. Second-stage planetary transmission structure; 9. Housing 2; 10. Third-stage planetary transmission structure; 11. Housing 3; 12. Fourth-stage parallel shaft transmission structure; 13. Rear housing; 14. First-stage planetary carrier; 15. First-stage sun gear; 16. First-stage planetary gears; 17. First-stage planetary gear shaft; 18. First-stage planetary gear bearing; 19. First-stage gear ring; 20. Second-stage planetary carrier; 21. Upper windward bearing of the second-stage planetary carrier; 22. Second-stage sun gear; 23. Second-stage planetary gears; 24. Second-stage planetary gear shaft; 25. Second-stage planetary gear bearing; 2 6. Second-stage gear ring; 27. Second-stage planetary carrier downwind bearing; 28. Third-stage planetary carrier; 29. ​​Third-stage planetary carrier upwind bearing; 30. Third-stage planetary carrier downwind bearing; 31. Third-stage sun gear; 32. Third-stage planetary gears; 33. Third-stage planetary gear shaft; 34. Third-stage planetary gear bearing; 35. Third-stage gear ring; 36. Hollow shaft; 37. Large gear upwind bearing; 38. Large gear; 39. Large gear downwind bearing; 40. High-speed shaft upwind bearing; 41. High-speed shaft; 42. High-speed shaft downwind bearing; 43. Process stud; 44. T-shaped locating pin; 45. Locating outer stop; 46. Locating inner stop; 47. Upper end cover; 48. Lower end cover; 49. Sight window cover. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] 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 following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0038] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0040] This invention provides a multi-stage planetary doubly-fed wind turbine gearbox with an integrated drive train, relating to the field of large-megawatt wind turbine gearboxes and applied to large-megawatt wind turbine generator sets. The multi-stage planetary doubly-fed wind turbine gearbox with an integrated drive train designed in this invention highly integrates the main shaft, bearing housing, and gearbox, employing a three-stage planetary drive plus a single-stage parallel shaft drive. It features light weight, small size, and relatively high reliability. While reducing the production and processing costs of the gearbox, it also effectively reduces the volume ratio of the wind turbine gearbox in the wind turbine generator set, saving nacelle space.

[0041] like Figure 1As shown, the present invention discloses a multi-stage planetary transmission doubly fed wind turbine gearbox with integrated transmission chain, comprising a main shaft 2, an upper windward bearing 3 on the main shaft, a bearing housing 4, a lower windward bearing 5 on the main shaft, a first-stage planetary transmission structure 6, a first-stage gearbox 7, a second-stage planetary transmission structure 8, a second-stage gearbox 9, a third-stage planetary transmission structure 10, a third-stage gearbox 11, a fourth-stage parallel shaft transmission structure 12, and a rear gearbox 13. The main shaft 2 is assembled and connected to the bearing housing 4 via the upper windward bearing 3 and the lower windward bearing 5 on the main shaft. The first-stage gearbox 7, the second-stage gearbox 9, and the third-stage gearbox 11 are arranged sequentially from left to right and are all located between the bearing housing 4 and the rear gearbox 13. The two sides of the first-stage planetary transmission structure 6 are respectively connected to the bearing housing 4 and the first housing 7; the two sides of the second-stage planetary transmission structure 8 are respectively connected to the first housing 7 and the second housing 9; the two sides of the third-stage planetary transmission structure 10 are respectively connected to the second housing 9 and the third housing 11; the two sides of the fourth-stage parallel shaft transmission structure 12 are respectively connected to the third housing 11 and the rear housing 13; one side of the main shaft 2 is connected to the hub 1, and the other side of the main shaft 2 is connected to the input end of the first-stage planetary transmission structure 6; the output end of the first-stage planetary transmission structure 6 is connected to the input end of the second-stage planetary transmission structure 8; the output end of the second-stage planetary transmission structure 8 is connected to the input end of the third-stage planetary transmission structure 10; the output end of the third-stage planetary transmission structure 10 is connected to the input end of the fourth-stage parallel shaft transmission structure 12; and the output end of the fourth-stage parallel shaft transmission structure 12 is used to connect to the generator. The wind power drives the main shaft 2 to rotate through the blade hub 1, which in turn drives the first-stage planetary transmission structure 6, the second-stage planetary transmission structure 8, the third-stage planetary transmission structure 10, and the fourth-stage parallel shaft transmission structure 12 in sequence. This process transmits the low speed of the hub 1 to a high speed through four speed-increasing stages, which in turn drives the generator at the back end to generate electricity.

[0042] like Figure 2As shown, the primary planetary transmission structure 6 includes a primary planetary carrier 14, a primary sun gear 15, primary planetary gears 16, primary planetary gear shafts 17, primary planetary gear bearings 18, and a primary ring gear 19. The primary planetary carrier 14 is connected to the main shaft 2. The windward side of the primary ring gear 19 is connected to the bearing housing 4, and the leeward side of the primary ring gear 19 is connected to the housing 7. The main shaft 2 and the primary planetary carrier 14 are connected by pins and studs. The rotation of the main shaft 2 drives the primary planetary carrier 14 to rotate. The primary ring gear 19 is fixed to the outer ring of the bearing housing 4 and remains stationary. Multiple primary planetary gear shafts 17 are connected to the primary planetary carrier 14 in a circumferential direction. Each primary planetary gear shaft 17 is connected to a primary planetary gear 16 through a primary planetary gear bearing 18. The multiple primary planetary gears 16 are located inside the primary ring gear 19, and the primary sun gear 15 is located at the center of the multiple primary planetary gears 16. The multiple primary planetary gears 16 are meshed with the primary ring gear 19 and the primary sun gear 15. Multiple first-stage planetary gears 16 mesh with the first-stage ring gear 19 as the first-stage planetary carrier 14 rotates, and each of them rotates around a multiple first-stage planetary gear shaft 17. Simultaneously, the multiple first-stage planetary gears 16 revolve around the first-stage sun gear 15, and through their meshing connection with the first-stage sun gear 15, they drive the first-stage sun gear 15 to rotate. In this first-stage planetary transmission, the first-stage planetary carrier 14 serves as the input power, and the first-stage sun gear 15 serves as the output power.

[0043] like Figure 3As shown, the secondary planetary transmission structure 8 includes a secondary planetary carrier 20, an upper windward bearing 21, a secondary sun gear 22, secondary planetary gears 23, a secondary planetary gear shaft 24, a secondary planetary gear bearing 25, a secondary ring gear 26, and a lower windward bearing 27. The upper windward side of the secondary ring gear 26 is connected to housing 7, and the lower windward side of the secondary ring gear 26 is connected to housing 9. The secondary ring gear 26 is fixed. The primary sun gear 15 serves as the input to the secondary planetary transmission, connecting to the external spline of the secondary planetary carrier 20 via an internal spline, and drives the secondary planetary carrier 20 to rotate. The upper windward side of the secondary planetary carrier 20 is connected to housing 7 via the upper windward bearing 21, and the lower windward side of the secondary planetary carrier 20 is connected to housing 9 via the lower windward bearing 27. Multiple secondary planetary gear shafts 24 are connected to the secondary planetary gear carrier 20. Each secondary planetary gear shaft 24 is connected to a secondary planetary gear 23 via a secondary planetary gear bearing 25. The multiple secondary planetary gears 23 are located inside the secondary ring gear 26. The secondary sun gear 22 is located at the center of the multiple secondary planetary gears 23. The multiple secondary planetary gears 23 are simultaneously meshed with both the secondary ring gear 26 and the secondary sun gear 22. The multiple secondary planetary gears 23 rotate around the multiple secondary planetary gear shafts 24, and simultaneously revolve around the secondary sun gear 22 as the secondary planetary carrier 20 rotates. Through meshing with the secondary sun gear 22, the multiple secondary planetary gears 23 drive the secondary sun gear 22 to rotate. The output end of the secondary sun gear 22 is connected to the input end of the three-stage planetary transmission structure.

[0044] like Figure 4As shown, the three-stage planetary transmission structure 10 includes a three-stage planetary carrier 28, an upper windward bearing 29, a lower windward bearing 30, a three-stage sun gear 31, three-stage planetary gears 32, a three-stage planetary gear shaft 33, a three-stage planetary gear bearing 34, and a three-stage gear ring 35. The upper windward side of the three-stage gear ring 35 is fixedly connected to housing 2 9, and the lower windward side of the three-stage gear ring 35 is fixedly connected to housing 3 11. The three-stage gear ring 35 remains stationary. The second-stage sun gear 22 serves as the input to the three-stage planetary transmission, connected to the outer spline of the three-stage planetary carrier 28 via an internal spline, and drives the three-stage planetary carrier 28 to rotate. The upper windward side of the three-stage planetary carrier 28 is connected to housing 2 9 via the upper windward bearing 29, and the lower windward side of the three-stage planetary carrier 28 is connected to housing 3 11 via the lower windward bearing 30. Multiple planetary gear shafts 33 are connected to the third-stage planetary carrier 28. Each third-stage planetary gear shaft 33 is connected to a third-stage planetary gear 32 via a third-stage planetary gear bearing 34. The multiple third-stage planetary gears 32 are located inside the third-stage gear ring 35. The third-stage sun gear 31 is located at the center of the multiple third-stage planetary gears 32. The multiple third-stage planetary gears 32 are simultaneously meshed with the third-stage gear ring 35 and the third-stage sun gear 31. The multiple third-stage planetary gears 32 rotate around the multiple third-stage planetary gear shafts 33 as centers. At the same time, as the third-stage planetary carrier 28 rotates, the multiple third-stage planetary gears 32 revolve around the third-stage sun gear 31, and drive the third-stage sun gear 31 to rotate through their meshing connection with the third-stage sun gear 31. The output end of the third-stage sun gear 31 is connected to the input end of the fourth-stage parallel shaft transmission structure 12.

[0045] like Figure 5 As shown, the four-stage parallel shaft transmission structure 12 includes a hollow shaft 36, an upper windward bearing 37 for the large gear, a large gear 38, a lower windward bearing 39 for the large gear, an upper windward bearing 40 for the high-speed shaft, a high-speed shaft 41, and a lower windward bearing 42 for the high-speed shaft. The third-stage sun gear 31 is connected to the hollow shaft 36 via an external spline and an internal spline. The upper windward side of the large gear 38 is connected to the housing 11 via the upper windward bearing 37 for the large gear, and the lower windward side of the large gear 38 is connected to the rear housing 13 via the lower windward bearing 39 for the large gear. The hollow shaft 36 and the large gear 38 are interference-fitted. The large gear 38 is meshed with the high-speed shaft 41. The upper windward side of the high-speed shaft 41 is connected to the housing 11 via the upper windward bearing 40 for the high-speed shaft, and the lower windward side of the high-speed shaft 41 is connected to the rear housing 13 via the lower windward bearing 42 for the high-speed shaft. The rotation of the third-stage sun gear 31 drives the rotation of the large gear 38, which in turn drives the rotation of the high-speed shaft 41.

[0046] like Figure 6 , Figure 7As shown, the outer ventral side of the first-stage planetary carrier 14 is provided with a positioning outer stop 45, and the corresponding position of the housing 7 is also provided with a positioning inner stop 46. The fit between these two positioning stops is H7 and f7, which is a small clearance fit, serving to position the first-stage planetary carrier 14 during assembly. Specifically, the positioning outer stop 45 is a cylindrical structure protruding from the first-stage planetary carrier 14, and the positioning inner stop 46 is a concave inner cylindrical surface structure on the housing 7. The fit between the inner and outer stops is the mutual mating of the inner and outer cylindrical surfaces for preliminary radial positioning, with a fit tolerance of H7 and f7, which is a small clearance fit; the contact between the inner and outer cylindrical end faces provides axial positioning. During the assembly of the primary planetary transmission structure 6, process studs 43 are used to pass through the secondary gear ring 26 and housing 7, engaging with the pre-drilled process holes in the primary planetary carrier 14 to provide initial positioning for the primary planetary carrier 14. The primary planetary carrier 14 moves downwind until its external positioning stop 45 engages with the internal positioning stop 46 of housing 7, completing secondary positioning. After this secondary positioning, T-shaped locating pins 44 are inserted through the through holes in the secondary gear ring 26 and housing 9, engaging with the primary planetary carrier 14 and housing 9 to complete the final axial and radial positioning, facilitating the subsequent horizontal assembly of the gearbox and spindle 2. It should be noted that the process studs 43 and T-shaped locating pins 44 are tooling used during the gearbox assembly stage and are removed after the overall gearbox assembly is completed.

[0047] like Figure 8 As shown, the internal spline of the first-stage sun gear 15 adopts an optimized design with a short spline structure. Sufficient space is left between the windward side of the internal spline and the stop of the first-stage sun gear 15 to avoid interference between the milling cutter, tool holder and the stop of the first-stage sun gear 15 during milling. This allows the machining method of the internal spline of the first-stage sun gear 15 to be changed from the original gear shaping to gear milling, which can greatly reduce the spline machining time.

[0048] like Figure 9 As shown, the three-stage gear ring 35 is designed with flanges extending at both ends, connected to housing 2 (9) and housing 3 (11) respectively by bolts and pins. The structural feature is that sufficient space is left between the flanges at both ends, and the bolts and pins at both ends are staggered. This structural form of the three-stage gear ring 35 allows for bolt removal, facilitating subsequent bolt disassembly and replacement. Specifically, the flange structure at both ends of the three-stage gear ring 35 includes a first flange structure and a second flange structure. The first flange structure is connected to housing 2 (9) by multiple bolts, and the second flange structure is connected to housing 3 (11) by multiple pins. Sufficient space is left between the first flange structure and the second flange structure, and the multiple bolts and pins are staggered.

[0049] like Figure 10As shown, the high-speed shaft upper wind bearing 40 is axially fixed on both sides by an upper end cover 47 and a lower end cover 48. Both the upper end cover 47 and the lower end cover 48 are bolted to the housing 11. A viewing window is provided on the housing 11 near the high-speed shaft upper wind bearing 40, and a viewing window cover 49 is provided at the viewing window. The viewing window cover 49 is bolted to the housing 11. When the gearbox replaces the high-speed shaft upper wind bearing 40 on the tower, the high-speed shaft upper wind bearing 40 can be removed from the rear end of the high-speed shaft 41 through the viewing window. At the same time, both the upper end cover 47 and the lower end cover 48 are designed with oil passages, which can simultaneously spray oil to lubricate the high-speed shaft upper wind bearing 40 from both ends.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage planetary transmission doubly-fed wind power gear box with integrated drive train, characterized in that, It includes: The main shaft (2), the main shaft upper wind direction bearing (3), the bearing seat (4), the main shaft lower wind direction bearing (5), the first planetary transmission structure (6), the second planetary transmission structure (8), the third planetary transmission structure (10), the fourth parallel shaft transmission structure (12) and the box body, the first planetary transmission structure (6), the second planetary transmission structure (8), the third planetary transmission structure (10) and the fourth parallel shaft transmission structure (12) are all installed on the box body, the main shaft (2) is assembled and connected with the bearing seat (4) through the main shaft upper wind direction bearing (3) and the main shaft lower wind direction bearing (5), one side of the main shaft (2) is connected with the wheel hub (1), the other side of the main shaft (2) is connected with the input end of the first planetary transmission structure (6), the output end of the first planetary transmission structure (6) is connected with the input end of the second planetary transmission structure (8), the output end of the second planetary transmission structure (8) is connected with the input end of the third planetary transmission structure (10), the output end of the third planetary transmission structure (10) is connected with the input end of the fourth parallel shaft transmission structure (12), and the output end of the fourth parallel shaft transmission structure (12) is used to be connected with the generator; The box body includes the box body one (7), the box body two (9), the box body three (11) and the rear box body (13), the first planetary transmission structure (6) is installed and connected with the bearing seat (4) and the box body one (7), the second planetary transmission structure (8) is installed and connected with the box body one (7) and the box body two (9), the third planetary transmission structure (10) is installed and connected with the box body two (9) and the box body three (11), and the fourth parallel shaft transmission structure (12) is installed and connected with the box body three (11) and the rear box body (13); The first planetary transmission structure (6) includes the first planetary carrier (14) and the first sun gear (15), the lower wind direction outer ring side of the first planetary carrier (14) is provided with a positioning outer stop (45), and the corresponding position of the box body one (7) is provided with a positioning inner stop (46); The second planetary transmission structure (8) includes the second planetary carrier (20) and the second sun gear (22), and the outer spline of the second planetary carrier (20) is connected with the first sun gear (15) through the inner spline; The third planetary transmission structure (10) includes the third planetary carrier (28), and the outer spline of the third planetary carrier (28) is connected with the second sun gear (22) through the inner spline; The four-stage parallel shaft transmission structure (12) comprises a hollow shaft (36), a large gear upper wind direction bearing (37), a large gear (38), a large gear lower wind direction bearing (39), a high-speed shaft upper wind direction bearing (40), a high-speed shaft (41) and a high-speed shaft lower wind direction bearing (42), the inner spline of the hollow shaft (36) is connected with the three-stage sun gear (31) of the three-stage planetary transmission structure (10) through the outer spline, the upper wind direction side of the large gear (38) is connected with the third box (11) through the large gear upper wind direction bearing (37), the lower wind direction side of the large gear (38) is connected with the rear box (13) through the large gear lower wind direction bearing (39), the hollow shaft (36) is connected with the large gear (38) in an interference fit, the large gear (38) is connected with the high-speed shaft (41) in a meshing manner, the upper wind direction side of the high-speed shaft (41) is connected with the third box (11) through the high-speed shaft upper wind direction bearing (40), the lower wind direction side of the high-speed shaft (41) is connected with the rear box (13) through the high-speed shaft lower wind direction bearing (42), the large gear (38) is driven to rotate by the rotation of the three-stage sun gear (31), and then the high-speed shaft (41) is driven to rotate.

2. The integrated multi-stage planetary transmission double-fed wind power gear box with a chain drive according to claim 1, characterized in that The first-stage planetary transmission structure (6) further comprises a first-stage planetary gear (16), a first-stage planetary gear shaft (17), a first-stage planetary gear bearing (18) and a first-stage ring gear (19), the first-stage carrier (14) is connected with the main shaft (2), the upper wind direction side of the first-stage ring gear (19) is fixedly connected with the outer ring of the bearing seat (4), the lower wind direction side of the first-stage ring gear (19) is fixedly connected with the first box (7), a plurality of first-stage planetary gear shafts (17) are connected with the first-stage carrier (14) in a circumferential direction, each first-stage planetary gear shaft (17) is connected with a first-stage planetary gear (16) through a first-stage planetary gear bearing (18), a plurality of first-stage planetary gears (16) are located inside the first-stage ring gear (19), the first-stage sun gear (15) is located at the center of the plurality of first-stage planetary gears (16), the plurality of first-stage planetary gears (16) are connected with the first-stage ring gear (19) and the first-stage sun gear (15) in a meshing manner, the plurality of first-stage planetary gears (16) rotate around the plurality of first-stage planetary gear shafts (17) as the center and revolve around the first-stage sun gear (15), and drive the first-stage sun gear (15) to rotate, and the output end of the first-stage sun gear (15) is connected with the input end of the second-stage planetary transmission structure (8).

3. The integrated multi planetary gear dual fed wind turbine gearbox with chain drive of claim 1, wherein, The secondary planetary gear structure (8) further comprises a secondary planetary carrier upper wind direction bearing (21), a secondary planetary gear (23), a secondary planetary gear shaft (24), a secondary planetary gear bearing (25), a secondary ring gear (26) and a secondary planetary carrier lower wind direction bearing (27), the upper wind direction side of the secondary ring gear (26) is fixedly connected with the box one (7), the lower wind direction side of the secondary ring gear (26) is fixedly connected with the box two (9), the upper wind direction side of the secondary planetary carrier (20) is connected with the box one (7) through the secondary planetary carrier upper wind direction bearing (21), and the lower wind direction side of the secondary planetary carrier (20) is connected with the box two (9) through the secondary planetary carrier lower wind direction bearing (27). A plurality of secondary planetary gear shafts (24) are connected to the secondary planetary carrier (20), each secondary planetary gear shaft (24) is connected with a secondary planetary gear (23) through a secondary planetary gear bearing (25), a plurality of secondary planetary gears (23) are located inside the secondary ring gear (26), the secondary sun gear (22) is located at the center of the plurality of secondary planetary gears (23), a plurality of secondary planetary gears (23) are in meshing connection with the secondary ring gear (26) and the secondary sun gear (22), a plurality of secondary planetary gears (23) rotate around the plurality of secondary planetary gear shafts (24) as the center, and simultaneously revolve around the secondary sun gear (22) to drive the secondary sun gear (22) to rotate, and the output end of the secondary sun gear (22) is connected with the input end of the tertiary planetary gear structure.

4. The integrated multi planetary gear dual fed wind turbine gearbox with chain drive of claim 1, wherein, The tertiary planetary gear structure (10) further comprises a tertiary planetary carrier upper wind direction bearing (29), a tertiary planetary carrier lower wind direction bearing (30), a tertiary sun gear (31), a tertiary planetary gear (32), a tertiary planetary gear shaft (33), a tertiary planetary gear bearing (34) and a tertiary ring gear (35), the upper wind direction side of the tertiary ring gear (35) is fixedly connected with the box two (9), the lower wind direction side of the tertiary ring gear (35) is fixedly connected with the box three (11), the upper wind direction side of the tertiary planetary carrier (28) is connected with the box two (9) through the tertiary planetary carrier upper wind direction bearing (29), and the lower wind direction side of the tertiary planetary carrier (28) is connected with the box three (11) through the tertiary planetary carrier lower wind direction bearing (30). A plurality of tertiary planetary gear shafts (33) are connected to the tertiary planetary carrier (28), each tertiary planetary gear shaft (33) is connected with a tertiary planetary gear (32) through a tertiary planetary gear bearing (34), a plurality of tertiary planetary gears (32) are located inside the tertiary ring gear (35), the tertiary sun gear (31) is located at the center of the plurality of tertiary planetary gears (32), a plurality of tertiary planetary gears (32) are in meshing connection with the tertiary ring gear (35) and the tertiary sun gear (31), a plurality of tertiary planetary gears (32) rotate around the plurality of tertiary planetary gear shafts (33) as the center, and simultaneously revolve around the tertiary sun gear (31) to drive the tertiary sun gear (31) to rotate, and the output end of the tertiary sun gear (31) is connected with the input end of the four-stage parallel shaft transmission structure (12).

5. The integrated multi planetary gear dual fed wind turbine gearbox with chain drive of claim 2, wherein, The inner spline of the primary sun gear (15) adopts a short spline structure, and a space is left between the upwind side of the inner spline of the primary sun gear (15) and the blocking table of the primary sun gear (15), and the processing mode of the inner spline of the primary sun gear (15) is gear milling.

6. The integrated multi-stage planetary gear wind power gearbox with chain drive according to claim 4, characterized in that, Both ends of the tertiary ring gear (35) are designed as an outer extension flange structure, including a first flange structure and a second flange structure, the first flange structure is connected with the second box (9) through a plurality of bolts, the second flange structure is connected with the third box (11) through a plurality of pins, and a space is left between the first flange structure and the second flange structure, and the plurality of bolts and the plurality of pins are arranged in a staggered manner.

7. The integrated drivetrain chain multi-stage planetary transmission doubly-fed wind power gear box of claim 1, wherein, Both sides of the high-speed shaft upwind bearing (40) are axially fixed through an upper end cover (47) and a lower end cover (48), the upper end cover (47) and the lower end cover (48) are fixed on the third box (11) through bolt clamping, a sight window is opened on the third box (11) near the high-speed shaft upwind bearing (40), a sight window cover plate (49) is arranged at the sight window, and the sight window cover plate (49) is clamped on the third box (11) through bolts.

8. The integrated drivetrain chain multi-stage planetary transmission doubly-fed wind power gear box of claim 7, wherein, The inside of the upper end cover (47) and the lower end cover (48) is provided with an oil way for simultaneously lubricating the high-speed shaft upwind bearing (40) from the inside oil ways of both sides.

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