Wind power speed reducer output structure

Abstract

An output structure of a wind power speed reducer relates to the technical field of yaw variable pitch speed reducers of wind generating sets, and is characterized in that the maintenance cost of an oil seal is effectively reduced through the underneath type layout of the oil seal, the modular replacement of an inner gear ring and a bearing raceway is realized by adopting a split type shell, and meanwhile, an axial pre-tightening mechanism of a bearing assembly is optimized to adapt to a split type structure. In the output structure of the wind power speed reducer, a planetary transmission component mainly comprises a clamp spring, a planet wheel, a bearing, a planet carrier, a spherical top, a positioning baffle, a first baffle, a second baffle and a sun wheel; the lower machine body component is mainly composed of a gear ring, a bearing baffle, a first cylindrical roller bearing, a lower machine body, an O-shaped sealing ring, a second cylindrical roller bearing, an oil seal base, a bolt, an oil drain plug screw, an open gear, a third baffle, a fourth baffle, a fifth baffle, a sixth baffle, an anti-rust baffle, an oil seal, a non-standard bearing inner ring, a spline shaft and a round nut.

Description

Technical Field

[0001] This invention relates to the field of yaw and pitch reducers for wind turbine generators, and particularly to an output structure for a wind turbine reducer. Background Technology

[0002] In traditional wind turbine gearbox designs, oil seals are typically located between or above the two rows of output bearings (near the input end), making it difficult to replace the oil seals and resulting in high maintenance costs. Meanwhile, the integrated lower body structure presents technical challenges such as high processing difficulty and high maintenance costs.

[0003] While existing technologies use cylindrical roller bearings to replace tapered roller bearings, the following pain points remain unresolved: (1) The relative position of the oil seal and the bearing affects the life of grease-lubricated bearings; (2) The integrated housing needs to be replaced as a whole after the bearing raceway wears, which is not economical; (3) The internal gear ring and the bearing raceway are made of the same material, which leads to cost waste.

[0004] Therefore, how to provide a wind turbine reducer output structure that can effectively reduce production and maintenance costs and effectively improve bearing life has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an output structure for a wind turbine reducer, which effectively reduces the maintenance cost of the oil seal by using a bottom-mounted oil seal layout, and adopts a split housing to realize modular replacement of the internal gear ring and bearing raceway. At the same time, the axial preload mechanism of the bearing assembly is optimized to adapt to the split structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A wind turbine reducer output structure includes: a planetary transmission component and a lower body component; the planetary transmission component mainly consists of a snap ring, planetary gears, bearings, a planetary carrier, a ball top, a positioning baffle, a first baffle, a second baffle, and a sun gear; the lower body component mainly consists of a gear ring, a bearing baffle, a first cylindrical roller bearing, a lower body, an O-ring seal, a second cylindrical roller bearing, an oil seal seat, bolts, a drain plug, an open gear, a third baffle, a fourth baffle, a fifth baffle, a sixth baffle, a rust-proof baffle, an oil seal, a non-standard bearing inner ring, a splined shaft, and a round nut. The sun gear is floatingly mounted on the dome, and the first and second baffles are interference-fitted to the sun gear; the planetary transmission component is floatingly mounted on the open gear, and the splined shaft is mounted on the open gear and transmits power through the splined shaft; the fifth and sixth baffles are interference-fitted to the splined shaft, and the third and fourth baffles are interference-fitted to the open gear; the non-standard bearing inner ring is interference-fitted to the open gear, and the bearing baffle is interference-fitted to the non-standard bearing inner ring and transmitted power through the round screw. The nut is locked to the open gear, and the anti-rust baffle is installed on the inner ring of the non-standard bearing; the oil seal is installed on the oil seal seat and locked to the lower body by the bolt, and the gear ring is assembled with the lower body in a transition fit manner; the second cylindrical roller bearing is assembled on the inner ring of the non-standard bearing and installed on the lower body, and the first cylindrical roller bearing is installed on the lower body, and the first cylindrical roller bearing and the second cylindrical roller bearing are limited by the bearing baffle, the lower body, and the inner ring of the non-standard bearing.

[0007] In practical applications, the split housing is composed of the gear ring and the lower body connected by high-strength bolts. At the same time, the lower body is connected to the gear ring by a stop. The gear ring is made of 42CrMoA tempered steel to ensure gear strength, and the lower body is made of 20CrMnMo carburized steel to optimize bearing life.

[0008] The oil seal is moved to the lower part of the second cylindrical roller bearing and together with the oil seal seat forms a bottom sealing barrier.

[0009] Specifically, an oil drain hole is added below the inner ring of the bearing to allow the lubricating oil in the bearing to be completely drained during oil changes.

[0010] Furthermore, the rust-proof baffle is embedded in the inner ring of the bearing, and the rust-proof baffle is made of stainless steel.

[0011] Compared with existing technologies, the wind power reducer output structure of the present invention has the following advantages: In the wind power reducer output structure provided by this invention, power is transmitted from the motor to the sun gear through various planetary transmission components. The sun gear drives the planetary gears and planet carrier to rotate, and the planet carrier outputs power to the spline shaft, and the spline gear outputs power to the open gear. Since the split housing can effectively reduce the raw material by 12% and save material costs by 18%, maintenance costs are reduced by 35%, and the raw material cost of the lower body is effectively reduced by 20%. In addition, the bearing uses oil lubrication instead of grease lubrication to effectively increase the bearing life by 20,000 hours. Attached Figure Description

[0012] Figure 1This is a cross-sectional view of the output structure of the wind power reducer provided in an embodiment of the present invention; Figure 2 for Figure 1 A magnified structural diagram of region B in the middle.

[0013] Figure label: 1-Snap ring; 2-Planet gear; 3-Bearing; 4-Planet carrier; 24-Spherical dome; 25-Positioning baffle; 26-First baffle; 27-Sun gear; 28-Second baffle; 5-Gear ring; 6-Bearing baffle; 7-First cylindrical roller bearing; 8-Lower body; 9-O-ring seal; 10-Second cylindrical roller bearing; 11-Oil seal seat; 12-Bolt; 13-Drain plug; 14-Open gear; 15-Third baffle; 16-Rust-proof baffle; 17-Oil seal; 18-Non-standard bearing inner ring; 19-Fourth baffle; 20-Fifth baffle; 21-Splined shaft; 22-Round nut; 23-Sixth baffle. Detailed Implementation

[0014] For ease of understanding, the output structure of the wind power reducer provided in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] This invention provides an output structure for a wind power reducer, such as... Figure 1 As shown, it includes: a planetary transmission component and a lower body component; the planetary transmission component mainly consists of a snap ring 1, planetary gears 2, bearings 3, a planetary carrier 4, a ball top 24, a positioning baffle 25, a first baffle 26, a second baffle 28, and a sun gear 27; the lower body component mainly consists of a gear ring 5, a bearing baffle 6, a first cylindrical roller bearing 7, a lower body 8, an O-ring seal 9, a second cylindrical roller bearing 10, an oil seal seat 11, a bolt 12, an oil drain plug 13, an open gear 14, a third baffle 15, a fourth baffle 19, a fifth baffle 20, a sixth baffle 23, a rust-proof baffle 16, an oil seal 17, a non-standard bearing inner ring 18, a splined shaft 21, and a round nut 22; The sun gear 27 is floatingly mounted on the dome 24, and the first baffle 26 and the second baffle 28 are interference-fitted to the sun gear 27; the planetary transmission component is floatingly mounted on the open gear 14, and the splined shaft 21 is mounted on the open gear 14 and transmits power through the splined shaft 21; the fifth baffle 20 and the sixth baffle 23 are interference-fitted to the splined shaft 21, and the third baffle 15 and the fourth baffle 19 are interference-fitted to the open gear 14; the non-standard bearing inner ring 18 is interference-fitted to the open gear 14, and the bearing baffle 6 is interference-fitted to the non-standard bearing inner ring 18 and transmits power through the circular... Nut 22 is locked to open gear 14, and anti-rust baffle 16 is installed on non-standard bearing inner ring 18; oil seal 17 is installed on oil seal seat 11 and locked to lower body 8 by bolt 12, and gear ring 5 is assembled with lower body 8 in a transition fit; second cylindrical roller bearing 10 is assembled on non-standard bearing inner ring 18 and installed on lower body 8, and first cylindrical roller bearing 7 is installed on lower body 8. First cylindrical roller bearing 7 and second cylindrical roller bearing 10 are limited by bearing baffle 6, lower body 8 and non-standard bearing inner ring 18.

[0016] Compared with the prior art, the wind power reducer output structure described in this embodiment of the invention has the following advantages: In the wind power reducer output structure provided in this embodiment of the invention, power is transmitted from the motor to the sun gear through various planetary transmission components. The sun gear drives the planetary gears and planet carrier to rotate, and the planet carrier outputs power to the spline shaft, and the spline gear outputs power to the open gear. Since the split housing can effectively reduce the raw material by 12% and save material costs by 18%, the maintenance cost is reduced by 35% and the raw material cost of the lower body is effectively reduced by 20%. In addition, the bearing uses oil lubrication instead of grease lubrication to effectively increase the bearing life by 20,000 hours.

[0017] In practical applications, such as Figure 1 and Figure 2 As shown, the split housing consists of a gear ring 5 and a lower body 8 connected by high-strength bolts. The lower body 8 is also connected to the gear ring 5 via a stop. If the raceway wears, the lower body 8 can be quickly replaced to effectively reduce maintenance costs. The gear ring 5 can be made of 42CrMoA tempered steel to ensure gear strength, and the lower body 8 can be made of 20CrMnMo carburized steel to optimize bearing life. Therefore, compared with the one-piece design, this split housing can effectively reduce raw material costs.

[0018] Among them, such as Figure 1 and Figure 2As shown, the oil seal 17 is moved to the lower part of the second cylindrical roller bearing 10 and forms a bottom sealing barrier together with the oil seal seat 11. After the oil seal 17 is moved down, the rollers of the output bearing are all lubricated with lubricating oil, which can effectively improve the bearing life. In addition, the oil seal 17 is a wear part with a life of 3 to 5 years. After the oil seal 17 is moved down, the oil seal can be replaced without disassembling the gearbox, which greatly reduces the maintenance cost.

[0019] Specifically, such as Figure 1 and Figure 2 As shown, an oil drain hole can be added below the inner ring of the bearing 3 to allow the lubricating oil in the bearing 3 to be completely drained during oil change, thereby effectively improving the quality of the oil after oil change and thus effectively extending the life of the rollers and raceways.

[0020] Furthermore, such as Figure 1 and Figure 2 As shown, the rust-proof baffle 16 is embedded in the inner ring of the bearing 3, and the rust-proof baffle 16 is preferably made of stainless steel, so as to effectively prevent the lower surface of the inner ring of the bearing 3 from rusting and avoid affecting the appearance and performance.

[0021] In summary, the wind power reducer output structure provided by the embodiments of the present invention has the following main advantages: 1. The floating dome can achieve three-dimensional degree of freedom compensation of the sun gear through spherical contact. Compared with the traditional dome ball or spring floating, it can more effectively balance the problem of uneven load between planetary gears, and is especially suitable for wind power conditions with high impact loads. 2. The inner ring of non-standard bearings can be optimized in terms of wall thickness and material according to the actual load requirements of open gears. The connection rigidity is enhanced by interference fit, thereby effectively reducing the relative displacement between gears and bearings, and thus improving transmission accuracy and fatigue resistance. Third, a composite constraint is formed by the triple limiting of the bearing baffle, the lower body, and the non-standard bearing inner ring (i.e., the bearing baffle is interference-fitted onto the non-standard bearing inner ring and the two are locked to the open gear by the round nut). The multiple limiting can effectively control the axial movement and radial offset of the cylindrical roller bearing. Especially under the conditions of frequent start-stop and variable load of wind power reducers, it can significantly reduce the risk of bearing failure and thus effectively extend the service life. Fourth, the sun gear floats via a spherical dome, and the planetary transmission components float via open gears, forming a "double-stage floating" structure, which can effectively compensate for manufacturing and installation errors, thereby reducing gear meshing impact; 5. The oil seal is locked to the lower body by the oil seal seat and bolts, which can replace the oil seal without disassembling the main body of the reducer, thus significantly improving the operation and maintenance efficiency; VI. The planetary transmission components are directly floating on the open gear, eliminating the intermediate transition shaft in the prior art, thereby effectively shortening the power transmission chain length. In other words, this technical solution transmits power directly through the spline shaft, effectively reducing the axial dimension. VII. Multiple interference fits and precision limiting reduce the gaps and sliding friction between components. Combined with the load uniformity brought about by the floating sun gear, the transmission efficiency can be improved by about 3%-5%, and energy consumption can be reduced by about 8% at the same power. 8. The interference fit between the non-standard bearing inner ring and the open gear, combined with the multiple limiting mechanisms of the cylindrical roller bearing, extends the failure cycle of the gearbox by more than 40% in the life test at 1.2 times the rated load.

[0022] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wind power reducer output structure, characterized in that, include: The planetary transmission component and the lower body component are as follows: The planetary transmission component mainly consists of a snap ring, planetary gears, bearings, a planetary carrier, a dome, a positioning baffle, a first baffle, a second baffle, and a sun gear; The lower body component mainly consists of a gear ring, a bearing baffle, a first cylindrical roller bearing, a lower body, an O-ring, a second cylindrical roller bearing, an oil seal seat, bolts, an oil drain plug, an open gear, a third baffle, a fourth baffle, a fifth baffle, a sixth baffle, a rust-proof baffle, an oil seal, a non-standard bearing inner ring, a splined shaft, and a round nut. The sun gear is floatingly mounted on the dome, and the first and second baffles are interference-fitted to the sun gear; the planetary transmission component is floatingly mounted on the open gear, and the splined shaft is mounted on the open gear and transmits power through the splined shaft; the fifth and sixth baffles are interference-fitted to the splined shaft, and the third and fourth baffles are interference-fitted to the open gear; the non-standard bearing inner ring is interference-fitted to the open gear, and the bearing baffle is interference-fitted to the non-standard bearing inner ring and transmitted power through the round screw. The nut is locked to the open gear, and the anti-rust baffle is installed on the inner ring of the non-standard bearing; the oil seal is installed on the oil seal seat and locked to the lower body by the bolt, and the gear ring is assembled with the lower body in a transition fit manner; the second cylindrical roller bearing is assembled on the inner ring of the non-standard bearing and installed on the lower body, and the first cylindrical roller bearing is installed on the lower body, and the first cylindrical roller bearing and the second cylindrical roller bearing are limited by the bearing baffle, the lower body, and the inner ring of the non-standard bearing.

2. The wind power reducer output structure according to claim 1, characterized in that, The split housing is composed of the gear ring and the lower body connected by high-strength bolts. The lower body is connected to the gear ring by a stop. The gear ring is made of 42CrMoA tempered steel to ensure gear strength, and the lower body is made of 20CrMnMo carburized steel to optimize bearing life.

3. The wind power reducer output structure according to claim 2, characterized in that, The oil seal is moved to the bottom of the second cylindrical roller bearing and together with the oil seal seat, forms a bottom sealing barrier.

4. The wind power reducer output structure according to claim 3, characterized in that, An oil drain hole is added below the inner ring of the bearing to allow the lubricating oil in the bearing to be completely drained during oil changes.

5. The wind power reducer output structure according to claim 4, characterized in that, The rust-proof baffle is embedded in the inner ring of the bearing, and the rust-proof baffle is made of stainless steel.

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