Wind power generation gearbox based on three-stage planetary gear train

Abstract

The wind power generation gearbox based on the three-stage planetary gear train comprises a gearbox body, a first planet carrier, a second planet carrier and a third planet carrier are sequentially arranged in the gearbox body from the input end to the output end, and a hollow pipe is arranged to penetrate through the first planet carrier, the second planet carrier and the third planet carrier; a first planetary gear train is arranged in the first planetary carrier and is in meshed connection with a second planetary carrier, a second planetary gear train is arranged in the second planetary carrier and is in meshed connection with a third planetary carrier, a third planetary gear train is arranged in the third planetary carrier and is in meshed connection with an output flange serving as an output end, and the output flange is in meshed connection with the first planetary gear train and the second planetary gear train. The first planet carrier comprises a planet carrier connecting shaft serving as an input end, and the planet carrier connecting shaft and the output flange both penetrate through the gear box body.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power technology, specifically relating to a wind power generation gearbox based on a three-stage planetary gear system. Background Technology

[0002] Currently, wind turbine generator sets mainly follow three technical routes: high-speed doubly-fed asynchronous, direct-drive permanent magnet (low-speed permanent magnet), and semi-direct-drive permanent magnet (medium-speed permanent magnet). The wind turbine gearbox is a crucial mechanical component in a wind turbine generator set. Its main function is to transmit the power generated by the wind turbine under wind force to the generator, converting mechanical energy into electrical energy. Because the wind turbine's rotational speed is low and cannot reach the speed required for the generator to produce electricity, a gearbox is needed to increase its speed.

[0003] High-speed doubly-fed wind turbines generate electricity by driving a doubly-fed asynchronous generator through a multi-stage gearbox. The units have advantages such as a wide speed range, independent adjustment of active and reactive power, and a small capacity of the rotor excitation converter. However, the gearbox has a large speed ratio, and the generator has slip rings and brushes, which affect reliability to some extent. Permanent magnet direct drive wind turbines generate electricity directly by driving the generator directly through the main shaft. The generator of the unit is connected to the grid through a full-power converter. It has the advantages of high efficiency, low noise, and strong low voltage ride-through capability. However, permanent magnet synchronous generators have a large number of pole pairs, large size and weight, and problems in installation and transportation. They also have high corrosion resistance requirements and high cost. Semi-direct drive wind turbines generate electricity by having the wind turbine drive a medium-speed generator through a medium-speed gearbox. Compared to direct drive turbines, they reduce the number of magnetic poles, size, and mass of the generator, while retaining the advantages of permanent magnet direct drive wind turbines, such as large capacity and strong low-voltage ride-through capability. Compared to doubly-fed turbines, they reduce the gearbox speed ratio and manufacturing difficulty.

[0004] However, the main components of existing wind turbine generators, especially those with power generation reaching the megawatt level, are located on the generator tower, which is quite high, resulting in very high transportation and installation costs. Therefore, to reduce costs without affecting production requirements, reducing the size and weight of the gearbox is a major design direction for wind power systems. Currently, wind turbine gearboxes with high torque density, high compactness, and high speed ratio are widely favored in the industry. Most of them use a combination of two planetary stages and one parallel stage. However, such gear transmission structures have low speed ratios, excessively long axial dimensions, and huge overall gearbox size and weight. Due to the increasing size and weight of gearboxes, not only are they difficult to manufacture, but transportation, assembly, and hoisting are also extremely difficult. Summary of the Invention

[0005] The purpose of this invention is to provide a wind power generation gearbox based on a three-stage planetary gear system, which solves the problems of low speed ratio and excessive axial length leading to large size and weight in the existing gearbox transmission structure.

[0006] The technical solution adopted in this invention is a wind power generation gearbox based on a three-stage planetary gear system, including a gearbox body. The gearbox body is provided with a first planetary carrier, a second planetary carrier and a third planetary carrier in sequence from the input end to the output end, and a hollow tube is provided to pass through the first planetary carrier, the second planetary carrier and the third planetary carrier. The first planetary carrier houses the first planetary gear train, which meshes with the second planetary carrier. The second planetary carrier houses the second planetary gear train, which meshes with the third planetary carrier. The third planetary carrier houses the third planetary gear train, which meshes with an output flange serving as the output end. The first planetary carrier includes a planetary carrier connecting shaft serving as the input end. Both the planetary carrier connecting shaft and the output flange penetrate the gearbox body.

[0007] The invention is further characterized in that, The gearbox housing includes a torque arm, one end of which is bolted to a first connecting housing, and a first-stage internal gear ring is clamped and fixed between the torque arm and the first connecting housing. The other end of the first connecting housing is bolted to a second connecting housing, and a second-stage internal gear ring is clamped between the first and second connecting housings. The other end of the second connecting housing is bolted to a rear end cover, and a third-stage internal gear ring is clamped and fixed between the second connecting housing and the rear end cover. The gearbox housing is composed of the torque arm, the first-stage internal gear ring, the first connecting housing, the second-stage internal gear ring, the second connecting housing, the third-stage internal gear ring, and the rear end cover.

[0008] The first-stage planetary gear train includes seven first-stage planetary gears, which are located inside the first-stage planetary carrier. The first-stage planetary carrier has windows on one side relative to the seven first-stage planetary gears, and one side of the first-stage planetary gear passes through the window to mesh with the first-stage internal gear ring. The space enclosed by the seven first-stage planetary gears contains the first-stage sun gear. All seven first-stage planetary gears are meshed with the first-stage sun gear. The inner side of the first-stage sun gear is provided with the inner spline of the first-stage sun gear. The second-stage planetary carrier is connected to the inner spline of the first-stage sun gear.

[0009] The first-stage planetary carrier has first-stage planetary gear shaft holes at the positions of the seven first-stage planetary gears. Planetary shafts pass through the first-stage planetary gear shaft holes and are movably connected to the first-stage planetary carrier. The planetary shafts pass through the corresponding first-stage planetary gears, fixing the first-stage planetary gears relatively inside the first-stage planetary carrier.

[0010] The second-stage planetary gear train consists of five second-stage planetary gears located inside the second-stage planetary carrier. The second-stage planetary carrier has windows on one side relative to the five second-stage planetary gears. One side of the second-stage planetary gear passes through the window and meshes with the second-stage internal gear ring. A second-stage sun gear is set within the space enclosed by five second-stage planetary gears. The second-stage planetary gears mesh with the second-stage sun gear. The side of the second-stage sun gear away from the first planetary gear train is fixedly connected to the external spline of the second-stage sun gear. The external spline of the second-stage sun gear is connected to the third-stage planetary carrier.

[0011] One end of the second-stage planetary carrier is fixedly connected to the external spline of the second-stage planetary carrier, and the external spline of the second-stage planetary carrier is engaged with the internal spline of the first-stage sun gear. The second-stage planetary carrier has second-stage planetary gear shaft holes at the positions of the five second-stage planetary gears. Planetary shafts pass through the second-stage planetary gear shaft holes and are movably connected to the second-stage planetary carrier. The planetary shafts pass through the corresponding second-stage planetary gears, fixing the second-stage planetary gears relatively inside the second-stage planetary carrier.

[0012] The third-stage planetary gear train includes three third-stage planetary gears. A third-stage sun gear is set within the space enclosed by the three third-stage planetary gears. All three third-stage planetary gears mesh with the third-stage sun gear. The third-stage planetary carrier has windows on one side relative to the three third-stage planetary gears. One side of the third-stage planetary gear passes through the window and meshes with the third-stage internal gear ring. The third-stage sun gear is fixedly connected to the side of the second-stage planetary gear train away from the third-stage sun gear with an external spline, and the external spline of the third-stage sun gear is connected to the output flange.

[0013] One end of the third-stage planetary carrier is fixedly connected to the internal spline of the third-stage planetary carrier, and is connected to the external spline of the second-stage sun gear through the internal spline of the third-stage planetary carrier. The third-stage planetary carrier has third-stage planetary gear shaft holes at the positions of the three third-stage planetary gears. Planetary shafts pass through the third-stage planetary gear shaft holes and are movably connected to the third-stage planetary carrier. The planetary shafts pass through the corresponding third-stage planetary gears, fixing the third-stage planetary gears relatively inside the third-stage planetary carrier.

[0014] The first-stage planetary carrier has a front bearing and a rear bearing respectively fitted at its front and rear ends. The front bearing is located inside the torque arm, and the rear bearing is located inside the first connecting housing. The second-stage planetary carrier has a front bearing and a rear bearing respectively fitted at its front and rear ends. The front bearing is located inside the first connecting housing, and the rear bearing is located inside the second connecting housing. The third-stage planetary carrier has a front bearing and a rear bearing respectively fitted at its front and rear ends. The front bearing is located inside the second connecting housing, and the rear bearing is located inside the rear end cover.

[0015] A torque arm bearing retaining ring is fixedly connected to the inner side of the torque arm to prevent axial movement of the front bearing of the first-stage planetary carrier; a first housing bearing retaining ring is fixedly connected to the inner side of the first connecting housing to prevent axial movement of the rear bearing of the first-stage planetary carrier and the front bearing of the second-stage planetary carrier; a second housing bearing retaining ring is fixedly connected to the inner side of the second connecting housing to prevent axial movement of the rear bearing of the second-stage planetary carrier and the front bearing of the third-stage planetary carrier; and a rear end cover bearing retaining ring is fixedly connected to the inner side of the rear end cover to prevent lateral movement of the rear bearing of the third-stage planetary carrier.

[0016] The beneficial effects of this invention are: This invention relates to a wind power generation gearbox based on a three-stage planetary gear system. The first-stage planetary gear system uses 7 planetary gears; the second-stage planetary gear system uses 5 planetary gears; and the third-stage planetary gear system uses 3 planetary gears, all of which are helical gears. This design enables the gearbox to transmit a large torque. At the same time, the use of three parallel planetary gear systems also ensures the overall transmission ratio of the gearbox.

[0017] This invention eliminates the need for existing methods of laterally fixing planetary gears with baffles by adding bosses at the planetary gear shaft holes of the first, second, and third planetary carriers. This saves axial space required for the gearbox. Furthermore, fixing rings for laterally fixing the bearings are provided on the torque arm, the first connecting housing, the second connecting housing, and the inner side of the rear end cover, further saving axial space required for gearbox assembly. This results in a more compact overall gearbox design. While ensuring transmission power and efficiency, the lightweight and integrated design significantly reduces the gearbox volume, saving space and weight, and lowering transportation, installation, and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a transmission schematic diagram of the wind power generation gearbox based on a three-stage planetary gear system of the present invention; Figure 2 This is a schematic diagram of the wind power generation gearbox based on a three-stage planetary gear system of the present invention; Figure 3 This is a cross-sectional view of the wind power generation gearbox based on a three-stage planetary gear system of the present invention; Figure 4 This is a schematic diagram of the structure of the first planetary gear train in this invention; Figure 5 This is a schematic diagram of the structure of the second planetary gear train in this invention; Figure 6 This is a schematic diagram of the third planetary gear train in this invention; Figure 7 This is a schematic diagram of the structure of the first planetary carrier in this invention; Figure 8This is a schematic diagram of the structure of the second planetary carrier in this invention; Figure 9 This is a schematic diagram of the structure of the third planetary carrier in this invention; Figure 10 This is an assembly diagram of the first, second, and third stage planetary gears of the present invention.

[0019] In the diagram, 1. Spindle, 2. Front spindle bearing housing, 3. Rear spindle bearing housing, 4. Gearbox housing, 5. Torque arm, 6. First-stage internal gear ring, 7. Second-stage internal gear ring, 8. Third-stage internal gear ring, 9. Rear end cover, 10. Output flange, 11. First connecting housing, 12. Second connecting housing, 13. First-stage planetary carrier, 14. Planetary carrier connecting shaft, 15. First-stage planetary gear shaft hole, 16. Second-stage planetary carrier, 17. Second-stage planetary carrier external spline, 18. Second-stage planetary gear shaft hole, 19. Third-stage planetary carrier, 20. Third-stage planetary carrier internal spline, 21. Third-stage planetary gear shaft hole, 22. First-stage planetary gear train, 23. First-stage planetary gear, 24. First-stage sun gear, 2 5. First-stage sun gear internal spline; 26. Second-stage planetary gear train; 27. Second-stage sun gear external spline; 28. Second-stage sun gear; 29. ​​Second-stage planetary gears; 30. Third-stage planetary gear train; 31. Third-stage sun gear external spline; 32. Third-stage sun gear; 33. Third-stage planetary gears; 34. Hollow tube; 35. Torque arm bearing retaining ring; 36. First housing bearing retaining ring; 37. Second housing bearing retaining ring; 38. Rear end cover bearing retaining ring; 39. First-stage planetary carrier front bearing; 40. First-stage planetary carrier rear bearing; 41. Second-stage planetary carrier front bearing; 42. Second-stage planetary carrier rear bearing; 43. Third-stage planetary carrier front bearing; 44. Third-stage planetary carrier rear bearing. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] This invention is based on a wind power generation gearbox with a three-stage planetary gear system, such as... Figure 1 As shown, during use, the main shaft 1 and the gearbox 4 are connected by a spline to transmit torque. The main shaft 1 is also provided with a front bearing seat 2 and a rear bearing seat 3 to support the main shaft 1. The wind power generation gearbox of the present invention includes a gearbox 4. The gearbox 4 is provided with a first planetary carrier 13, a second planetary carrier 16 and a third planetary carrier 19 arranged sequentially from the input end to the output end. A hollow tube 34 is provided to pass through the first planetary carrier 13, the second planetary carrier 16 and the third planetary carrier 19. Each planetary carrier is supported by a tapered bearing.

[0022] The first planetary carrier 13 houses a first planetary gear train 22, which meshes with the second planetary carrier 16. The second planetary carrier 16 houses a second planetary gear train 26, which meshes with the third planetary carrier 19. The third planetary carrier 19 houses a third planetary gear train 30, which meshes with an output flange 10 serving as the output end. All three planetary gear trains—the first planetary gear train 22, the second planetary gear train 26, and the third planetary gear train 30—use helical gears, and their internal planetary gears are supported by double-row cylindrical roller bearings.

[0023] Furthermore, the first planetary carrier 13 includes a planetary carrier connecting shaft 14 as an input end. The planetary carrier connecting shaft 14 is connected to the main shaft 1 via a spline. Both the planetary carrier connecting shaft 14 and the output flange 10 pass through the gearbox body 4.

[0024] Example 1 The wind power generation gearbox based on a three-stage planetary gear system of the present invention includes a gearbox body 4, such as... Figure 2 As shown, the gearbox body 4 includes a torque arm 5. The torque arm 5 can reduce the large load during the transmission of the main shaft 1, making the gearbox have a better load-bearing capacity. One end of the torque arm 5 is bolted to a first connecting housing 12, and a first-stage internal gear ring 6 is clamped and fixed between the torque arm 5 and the first connecting housing 11. The other end of the first connecting housing 11 is bolted to a second connecting housing 12, and a second-stage internal gear ring 7 is clamped between the first connecting housing 11 and the second connecting housing 12. The other end of the second connecting housing 12 is bolted to a rear end cover 9, and a third-stage internal gear ring 8 is clamped and fixed between the second connecting housing 12 and the rear end cover 9. The gearbox body 4 is composed of the torque arm 5, the first-stage internal gear ring 6, the first connecting housing 11, the second-stage internal gear ring 7, the second connecting housing 12, the third-stage internal gear ring 8, and the rear end cover 9.

[0025] like Figure 3 As shown, the gearbox 4 is equipped with a first planetary carrier 13, a second planetary carrier 16 and a third planetary carrier 19, as well as a first planetary gear train 22, a second planetary gear train 26 and a third planetary gear train 30 corresponding to each planetary carrier.

[0026] like Figure 4 As shown, the first-stage planetary gear train 22 includes seven first-stage planetary gears 23. The seven first-stage planetary gears 23 are located inside the first-stage planetary carrier 13. A first-stage sun gear 24 is arranged within the space enclosed by the seven first-stage planetary gears 23. All seven first-stage planetary gears 23 are meshed with the first-stage sun gear 24. An inner spline 25 of the first-stage sun gear 24 is arranged on the inner side of the first-stage sun gear 24. The second-stage planetary carrier 16 is connected to the inner spline 25 of the first-stage sun gear.

[0027] like Figure 7As shown, the first-stage planetary carrier 13 has windows on one side of each of the seven first-stage planetary gears 23. One side of each first-stage planetary gear 23 passes through the window and meshes with the first-stage internal gear ring 6. Furthermore, the first-stage planetary carrier 13 has first-stage planetary gear shaft holes 15 on each of the seven first-stage planetary gears 23. Planetary shafts pass through these holes 15 and are movably connected to the first-stage planetary carrier 13. The planetary shafts pass through the corresponding first-stage planetary gears 23, thus fixing the first-stage planetary gears 23 relatively within the first-stage planetary carrier 13. That is, while the first-stage planetary gears 23 are relatively fixed in specific positions within the first-stage planetary carrier 13, they can rotate relative to the first-stage planetary carrier 13.

[0028] Furthermore, a boss is provided around the first-stage planetary gear shaft hole 15. The boss can fix the first-stage planetary gear 23 to the first-stage planetary carrier 13 laterally, eliminating the need for a baffle to fix the first-stage planetary gear 23 and saving space in the first-stage planetary carrier 13.

[0029] like Figure 5 As shown, the second-stage planetary gear train 26 includes five second-stage planetary gears 29, which are located inside the second-stage planetary carrier 16. A second-stage sun gear 28 is arranged within the space enclosed by the five second-stage planetary gears 29. The second-stage planetary gears 29 mesh with the second-stage sun gear 28. The side of the second-stage sun gear 28 away from the first planetary gear train 22 is fixedly connected to the external spline 27 of the second-stage sun gear. The external spline 27 of the second-stage sun gear is connected to the third-stage planetary carrier 19.

[0030] like Figure 8 As shown, the second-stage planet carrier 16 has windows on one side of each of the five second-stage planet gears 29. One side of the second-stage planet gear 29 passes through the window and meshes with the second-stage internal gear ring 7. One end of the second-stage planet carrier 16 is fixedly connected to the external spline 17 of the second-stage planet carrier, and the external spline 17 of the second-stage planet carrier meshes with the internal spline 25 of the first-stage sun gear. The second-stage planetary carrier 16 has planetary gear shaft holes 18 at positions corresponding to the five second-stage planetary gears 29. Planetary shafts pass through these holes 18 and are movably connected to the second-stage planetary carrier 16. The planetary shafts pass through the corresponding second-stage planetary gears 29, thus fixing the second-stage planetary gears 29 relatively within the second-stage planetary carrier 16. In other words, while the second-stage planetary gears 29 are relatively fixed in their specific positions within the second-stage planetary carrier 16, they can still rotate relative to the second-stage planetary carrier 16.

[0031] like Figure 6As shown, the third-stage planetary gear train 30 includes three third-stage planetary gears 33. A third-stage sun gear 32 is arranged within the space enclosed by the three third-stage planetary gears 33. All three third-stage planetary gears 33 mesh with the third-stage sun gear 32. The side of the third-stage sun gear 32 away from the second-stage planetary gear train 26 is fixedly connected to the external spline 31 of the third-stage sun gear. The external spline 31 of the third-stage sun gear is connected to the output flange 10.

[0032] like Figure 9 As shown, the third-stage planet carrier 19 has windows on one side of each of the three third-stage planet gears 33. One side of the third-stage planet gear 33 passes through the window and meshes with the third-stage internal gear ring 8. One end of the third-stage planet carrier 19 is fixedly connected to the third-stage planet carrier internal spline 20, which meshes with the second-stage sun gear external spline 27. The third-stage planetary carrier 19 has planetary gear shaft holes 21 at positions corresponding to the three third-stage planetary gears 33. Planetary shafts pass through these holes 21 and are movably connected to the third-stage planetary carrier 19. The planetary shafts pass through the corresponding third-stage planetary gears 33, thus fixing the third-stage planetary gears 33 relatively within the third-stage planetary carrier 19. In other words, while the third-stage planetary gears 33 are relatively fixed in their specific positions within the third-stage planetary carrier 19, they can still rotate relative to the third-stage planetary carrier 19.

[0033] Furthermore, a boss is provided around the third-stage planetary gear shaft hole 21. The boss can fix the third-stage planetary gear 33 to the third-stage planetary carrier 19 laterally, eliminating the need for a baffle to fix the third-stage planetary gear 33 and saving space in the third-stage planetary carrier 19.

[0034] When the main shaft 1 transmits torque to the first-stage planetary carrier 13, the first-stage planetary carrier 13 rotates with the main shaft 1. Since the first-stage planetary gear 23 is fixed inside the first-stage planetary carrier 13 under the action of the planetary shaft, when the first-stage planetary gear 23 rotates, the first-stage planetary gear 23 rotates synchronously with itself. That is, the first-stage planetary gear 23 rolls along the circumference of the first-stage internal gear ring 6. The first-stage sun gear 24, located at the center of the first-stage planetary gear 23, rotates along with it under the drive of multiple first-stage planetary gears 23. When the first-stage sun gear 24 starts to rotate, the second-stage planetary carrier 16 rotates synchronously with the first-stage sun gear 24 due to the meshing effect of the internal spline 25 of the first-stage sun gear and the external spline 17 of the second-stage planetary carrier.

[0035] When the second-stage planetary carrier 16 rotates, the second-stage planetary gears 29 inside it rotate accordingly and move around the circumference of the second-stage internal gear ring 7. Under the action of the second-stage planetary gears 29, the second-stage sun gear 28 rotates, driving the external spline 27 of the second-stage sun gear to rotate synchronously. Since the external spline 27 of the second-stage sun gear is meshed with the internal spline 20 of the third-stage planetary carrier, the third-stage planetary carrier 19 rotates synchronously with the second-stage sun gear 28. Driven by the third-stage planetary carrier 19, the third-stage planetary gear 33 moves along the circumference of the third-stage internal gear ring 8, driving the third-stage sun gear 32 to rotate, thereby realizing the rotation of the output flange 10. Example 2 Based on Example 1, such as Figure 10 As shown, in the wind power gearbox based on a three-stage planetary gear system of the present invention, the first-stage planetary carrier 13 is fitted with a first-stage planetary carrier front bearing 39 and a first-stage planetary carrier rear bearing 40 at its front and rear ends, respectively. The first-stage planetary carrier front bearing 39 is located inside the torque arm 5, and the first-stage planetary carrier rear bearing 40 is located inside the first connecting housing 11. The second-stage planetary carrier 16 is fitted with a second-stage planetary carrier front bearing 41 and a second-stage planetary carrier rear bearing 42 at its front and rear ends, respectively. The second-stage planetary carrier front bearing 41 is located inside the first connecting housing 11, and the second-stage planetary carrier rear bearing 42 is located inside the second connecting housing 12. The third-stage planetary carrier 19 is fitted with a third-stage planetary carrier front bearing 43 and a third-stage planetary carrier rear bearing 44 at its front and rear ends, respectively. The third-stage planetary carrier front bearing 43 is located inside the second connecting housing 12, and the third-stage planetary carrier rear bearing 44 is located inside the rear end cover 9.

[0036] Each bearing and each planetary carrier is an interference fit, eliminating the need for bearing fixing baffles, saving space in gearbox 4, and has a simple structure, good centering, large load-bearing capacity, minimal weakening of the planetary carrier's strength, and improved impact resistance.

[0037] Example 3 Based on Embodiment 2, the present invention provides a torsion arm bearing retaining ring 35 fixed to the inner side of the torsion arm 5 of the wind power generation gearbox based on a three-stage planetary gear system to prevent axial movement of the first-stage planetary carrier front bearing 39; a first housing bearing retaining ring 36 fixed to the inner side of the first connecting housing 11 to prevent axial movement of the first-stage planetary carrier rear bearing 40 and the second-stage planetary carrier front bearing 41; a second housing bearing retaining ring 37 fixed to the inner side of the second connecting housing 12 to prevent axial movement of the second-stage planetary carrier rear bearing 42 and the third-stage planetary carrier front bearing 43; and a rear end cover bearing retaining ring 38 fixed to the inner side of the rear end cover 9 to prevent lateral movement of the third-stage planetary carrier rear bearing 43.

[0038] In this invention, a wind power generation gearbox based on a three-stage planetary gear system transmits torque. The main shaft 1 is bolted to the planetary carrier connecting shaft 14 of the first-stage planetary carrier 13. The main shaft 1 drives the first-stage planetary carrier 13 to move, which in turn drives the first-stage planetary gear train 22. The first-stage planetary gear train 22 is connected to the second-stage planetary carrier via the internal spline of the first-stage sun gear and the external spline 17 of the second-stage planetary carrier, thus driving the second-stage planetary carrier 16 to move. The second-stage planetary carrier 16 drives the second-stage planetary gear train 26 to rotate. The second-stage planetary gear train 26 is connected to the third-stage planetary carrier via the external spline 31 of the second-stage sun gear and the internal spline 20 of the third-stage planetary carrier, thus driving the third-stage planetary carrier 19 to move. The third-stage planetary carrier 19 drives the third-stage planetary gear train 30 to move, which in turn is connected to the output flange 10 via the external spline 31 of the third-stage sun gear and the internal spline of the output flange 10, thus driving the output flange 10 to move. This process transmits motion.

Claims

1. Wind power gearbox based on a three-stage planetary gear train, characterized in that, The gearbox includes a gearbox body (4), in which a first planetary carrier (13), a second planetary carrier (16) and a third planetary carrier (19) are arranged sequentially from the input end to the output end, and a hollow tube (34) is provided to pass through the first planetary carrier (13), the second planetary carrier (16) and the third planetary carrier (19). The first planetary carrier (13) is provided with a first planetary gear train (22), which is meshed with the second planetary carrier (16). The second planetary carrier (16) is provided with a second planetary gear train (26), which is meshed with the third planetary carrier (19). The third planetary carrier (19) is provided with a third planetary gear train (30), which is meshed with an output flange (10) as the output end. The first planetary carrier (13) includes a planetary carrier connecting shaft (14) as the input end. Both the planetary carrier connecting shaft (14) and the output flange (10) pass through the gearbox body (4).

2. A wind power gear box based on a three-stage planetary gear train according to claim 1, characterized in that, The gearbox (4) includes a torque arm (5), one end of which is bolted to a first connecting housing (12), and a first-stage internal gear ring (6) is clamped and fixed between the torque arm (5) and the first connecting housing (11). The other end of the first connecting housing (11) is bolted to a second connecting housing (12), and a second-stage internal gear ring (7) is clamped between the first connecting housing (11) and the second connecting housing (12). The other end of the second connecting housing (12) is bolted to a rear end cover (9), and a third-stage internal gear ring (8) is clamped and fixed between the second connecting housing (12) and the rear end cover (9). The gearbox (4) is composed of the torque arm (5), the first-stage internal gear ring (6), the first connecting housing (11), the second-stage internal gear ring (7), the second connecting housing (12), the third-stage internal gear ring (8), and the rear end cover (9).

3. A wind power gear box based on a three-stage planetary gear train according to claim 2, characterized in that, The first-stage planetary gear train (22) includes seven first-stage planetary gears (23). The seven first-stage planetary gears (23) are located inside the first-stage planetary carrier (13), and the first-stage planetary carrier (13) has windows on one side relative to the seven first-stage planetary gears (23). One side of the first-stage planetary gear (23) passes through the window and meshes with the first-stage internal gear ring (6). A first-stage sun gear (24) is provided within the space enclosed by the seven first-stage planetary gears (23). All seven first-stage planetary gears (23) are meshed with the first-stage sun gear (24). The inner side of the first-stage sun gear (24) is provided with the inner spline (25) of the first-stage sun gear. The second-stage planetary carrier (16) is connected to the inner spline (25) of the first-stage sun gear.

4. A wind power gear box based on a three-stage planetary gear train according to claim 3, characterized in that, The first-stage planetary carrier (13) has first-stage planetary gear shaft holes (15) at the positions of the seven first-stage planetary gears (23). A planetary shaft passes through the first-stage planetary gear shaft hole (15). The planetary shaft is movably connected to the first-stage planetary carrier (13). The planetary shaft passes through the corresponding first-stage planetary gear (23) and fixes the first-stage planetary gear (23) relatively inside the first-stage planetary carrier (13).

5. A wind power gear box based on a three-stage planetary gear train according to claim 3, characterized in that, The second-stage planetary gear train (26) includes five second-stage planetary gears (29). The second-stage planetary gears (29) are located inside the second-stage planetary carrier (16), and the second-stage planetary carrier (16) has windows on one side of each of the five second-stage planetary gears (29). One side of the second-stage planetary gears (29) passes through the windows and meshes with the second-stage internal gear ring (7). A second-stage sun gear (28) is provided within the space enclosed by five second-stage planetary gears (29). The second-stage planetary gears (29) mesh with the second-stage sun gear (28). The second-stage sun gear (28) is fixedly connected to the side of the second-stage sun gear (28) away from the first planetary gear train (22) by an external spline (27). The external spline (27) of the second-stage sun gear is connected to the third-stage planet carrier (19).

6. The wind power generation gearbox based on a three-stage planetary gear system according to claim 5, characterized in that, One end of the second-stage planetary carrier (16) is fixedly connected to the external spline (17) of the second-stage planetary carrier, and the external spline (17) of the second-stage planetary carrier is engaged with the internal spline (25) of the first-stage sun gear. The second-stage planetary carrier (16) has a second-stage planetary gear shaft hole (18) at each of the five second-stage planetary gears (29). A planetary shaft passes through the second-stage planetary gear shaft hole (18). The planetary shaft is movably connected to the second-stage planetary carrier (16). The planetary shaft passes through the corresponding second-stage planetary gear (29) and fixes the second-stage planetary gear (29) relatively inside the second-stage planetary carrier (16).

7. The wind power generation gearbox based on a three-stage planetary gear system according to claim 5, characterized in that, The third-stage planetary gear train (30) includes three third-stage planetary gears (33). A third-stage sun gear (32) is arranged within the space enclosed by the three third-stage planetary gears (33). All three third-stage planetary gears (33) mesh with the third-stage sun gear (32). The third-stage planet carrier (19) has windows on one side relative to the three third-stage planetary gears (33). One side of the third-stage planetary gear (33) passes through the window and meshes with the third-stage internal gear ring (8). The third-stage sun gear (32) is fixedly connected to the side away from the second-stage planetary gear train (26) by an external spline (31), which is connected to the output flange (10).

8. The wind power generation gearbox based on a three-stage planetary gear system according to claim 7, characterized in that, One end of the third-stage planetary carrier (19) is fixedly connected to the inner spline (20) of the third-stage planetary carrier, and is engaged with the outer spline (27) of the second-stage sun gear through the inner spline (20); The third-stage planetary carrier (19) has a third-stage planetary gear shaft hole (21) at each of the three third-stage planetary gears (33). A planetary shaft passes through the third-stage planetary gear shaft hole (21). The planetary shaft is movably connected to the third-stage planetary carrier (19). The planetary shaft passes through the corresponding third-stage planetary gear (33) and fixes the third-stage planetary gear (33) relatively inside the third-stage planetary carrier (19).

9. The wind power generation gearbox based on a three-stage planetary gear system according to claim 2, characterized in that, The first-stage planetary carrier (13) is fitted with a first-stage planetary carrier front bearing (39) and a first-stage planetary carrier rear bearing (40) at its front and rear ends, respectively. The first-stage planetary carrier front bearing (39) is located inside the torque arm (5), and the first-stage planetary carrier rear bearing (40) is located inside the first connecting housing (11). The second-stage planetary carrier (16) is fitted with a second-stage planetary carrier front bearing (41) and a second-stage planetary carrier rear bearing (42) at its front and rear ends, respectively. The second-stage planetary carrier front bearing (41) is located inside the first connecting housing (11), and the second-stage planetary carrier rear bearing (42) is located inside the second connecting housing (12). The third-stage planetary carrier (19) is fitted with a third-stage planetary carrier front bearing (43) and a third-stage planetary carrier rear bearing (44) at its front and rear ends, respectively. The third-stage planetary carrier front bearing (43) is located inside the second connecting housing (12), and the third-stage planetary carrier rear bearing (44) is located inside the rear end cover (9).

10. The wind power generation gearbox based on a three-stage planetary gear system according to claim 9, characterized in that, The torque arm (5) is fixedly connected to the inner side with a torque arm bearing retaining ring (35) for preventing axial movement of the first-stage planetary carrier front bearing (39); the first connecting housing (11) is fixedly connected to the inner side with a first housing bearing retaining ring (36) for preventing axial movement of the first-stage planetary carrier rear bearing (40) and the second-stage planetary carrier front bearing (41); the second connecting housing (12) is fixedly connected to the inner side with a second housing bearing retaining ring (37) for preventing axial movement of the second-stage planetary carrier rear bearing (42) and the third-stage planetary carrier front bearing (43); the rear end cover (9) is fixedly connected to the inner side with a rear end cover bearing retaining ring (38) for preventing lateral movement of the third-stage planetary carrier rear bearing (43).

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