Compact type wind power speed reducer output shaft supporting structure
By merging the inner ring of the cylindrical roller bearing into a single stepped non-standard part and combining it with precision forging and nitriding treatment, the problems of large axial space occupation and low material utilization in the output shaft design of traditional wind power reducers are solved, achieving compactness and lightweight, and improving the accuracy and stability of the transmission system.
Patent Information
- Application Number
- CN202510949858.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-09-12
AI Technical Summary
The output shaft design of traditional wind turbine reducers has problems such as large axial space occupation, low material utilization and high cost, making it difficult to achieve compactness and lightweight.
The combination structure of low-speed planetary transmission components and cylindrical roller bearings is adopted. By merging the inner ring into a single stepped non-standard part, using a taper-free design and precision forging process, combined with nitriding treatment, the compactness and lightweight of the bearing are achieved.
The axial dimension was reduced by 30%, the bearing pitch was shortened by 15%-20%, and the material utilization rate was increased by 25%, which reduced production costs and time costs and improved the accuracy and stability of the transmission system.
Smart Images
Figure CN120626728A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of wind power yaw pitch reducers, and in particular to a compact wind power reducer output shaft support structure. Background Art
[0002] The output shaft of a wind turbine reducer must withstand high torque, complex alternating loads, and extreme operating conditions. The reliability of its bearing system directly impacts the life of the gearbox. Traditionally, the output shaft often utilizes two rows of tapered roller bearings arranged back-to-back to simultaneously withstand radial and bidirectional axial loads. However, tapered roller bearings have the following main drawbacks: (1) Large axial space occupation: The tapered roller bearing's taper angle design results in a large bearing pitch (the span between two bearings), which requires a reserved installation adjustment gap, thus restricting the compactness of the reducer's axial dimensions; (2) The bearing cost is relatively high; (3) The traditional output shaft adopts a solid structure with low material utilization, which is not conducive to lightweight design. Summary of the Invention
[0003] The object of the present invention is to provide a compact wind power reducer output shaft support structure, which can be compact, lightweight and manufactured at low cost.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A compact wind power reducer output shaft support structure includes: a low-speed planetary transmission component, and the low-speed planetary transmission component consists of a planet carrier, planetary gears, bearings, a sun gear, a first baffle, a second baffle, a positioning baffle, a ball top, and a first retaining spring; the sun gear is floatingly mounted on the ball top; the first baffle and the second baffle are interference-fitted on the sun gear and act as an oil seal; the low-speed planetary transmission component is floatingly mounted on an open gear and transmits power through a spline wheel; power is transmitted from a motor to the sun gear through various stages of the planetary transmission component, the sun gear drives the planetary gears and the planet carrier to rotate, and the planet carrier transmits power to the spline wheel, and then the spline wheel outputs the power to the open gear; The lower body component is composed of a lower body, a third baffle, a first cylindrical roller bearing, an oil seal, an inner ring of a non-standard bearing, a second cylindrical roller bearing, a second retaining spring, the open gear, a fourth baffle, a fifth baffle, a sixth baffle, the spline wheel, a round nut, a third retaining spring, and a seventh baffle; the sixth baffle and the seventh baffle are interference-mounted on the spline wheel and act as an oil seal; the fifth baffle is interference-mounted on the open gear and acts as an oil seal, and is limited by the second retaining spring; the fourth baffle is interference-mounted on the open gear and acts as a dust-proof function; the inner ring of the non-standard bearing is interference-mounted on the open gear; the inner ring of the non-standard bearing and the fourth baffle are interference-fitted and locked with the open gear by a round nut; the oil seal is axially limited by the third retaining spring; the first cylindrical roller bearing and the second cylindrical roller bearing are limited by the fourth baffle, the lower body, and the inner ring of the non-standard bearing.
[0005] In actual application, the outer ring of the first cylindrical roller bearing and the outer ring of the second cylindrical roller bearing are integrally formed with the support housing.
[0006] The inner ring of the first cylindrical roller bearing and the inner ring of the second cylindrical roller bearing are combined into a single stepped non-standard part, and ribs are provided at both ends of the non-standard inner ring to constrain the rollers.
[0007] Specifically, the non-standard inner ring of the single stepped non-standard part is made of 20CrMnTi alloy steel.
[0008] Furthermore, one end of the non-standard inner ring of the single stepped non-standard part is connected to the open gear without a key by accurately calculating the interference.
[0009] Furthermore, the stepped portion of the non-standard inner ring of the single stepped non-standard part cooperates with the inner ring of the first cylindrical roller bearing and the inner ring of the second cylindrical roller bearing respectively, and achieves smooth transmission of power through close contact between the roller and the raceway.
[0010] Furthermore, the support housing is directly formed into the raceways of the outer rings of the first cylindrical roller bearing and the second cylindrical roller bearing by a precision forging process, and is subjected to a nitriding treatment to enhance the surface hardness of the raceways.
[0011] Furthermore, the output shaft is a hollow structure, and the ratio of the inner hole diameter to the shaft diameter is 0.4-0.5.
[0012] Compared with the prior art, the compact wind turbine reducer output shaft support structure of the present invention has the following advantages: In the compact wind power reducer output shaft support structure provided by the present invention, since cylindrical roller bearings have no taper angle and no axial preload requirement, the axial dimension is reduced by about 30% and the bearing pitch is shortened by 15%-20%; and, through finite element simulation, the bearing arrangement angle and preload force distribution are optimized to ensure that the radial load capacity is equivalent to the original tapered bearing solution in the prior art; since the inner rings of the two rows of cylindrical roller bearings are merged into a single stepped non-standard part, and ribs are provided at both ends of the inner ring to constrain the rollers, the material utilization rate is increased by 25%, and the coaxiality error caused by split assembly can be avoided, which effectively improves the overall accuracy and stability of the transmission system, while simplifying the processing process, significantly reducing the number of parts, and effectively improving assembly efficiency, reducing production costs and time costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A schematic structural diagram of a compact wind power reducer output shaft support structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a non-standard combined bearing inner ring in a compact wind turbine reducer output shaft support structure provided by an embodiment of the present invention; Figure 3 This is a schematic diagram of the partially enlarged structure of the non-standard raceway in the output shaft support structure of the compact wind power reducer provided by an embodiment of the present invention.
[0014] Reference numerals: 1- planetary gear; 2- bearing; 3- planetary carrier; 4 - lower body; 5 - third baffle; 6 - first cylindrical roller bearing; 7 - oil seal; 8 - non-standard bearing inner ring; 9 - second cylindrical roller bearing; 10 - second retaining spring; 11 - open gear; 12 - fourth baffle; 13 - fifth baffle; 14 - sixth baffle; 15 - spline wheel; 16 - round nut; 17 - third retaining spring; 18 - seventh baffle; 19-ball top; 20-positioning baffle; 21-second baffle; 22-sun gear; 23-first retaining spring; 24-first baffle. DETAILED DESCRIPTION
[0015] For ease of understanding, the compact wind power reducer output shaft support structure provided by an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
[0016] The embodiment of the present invention provides a compact wind power reducer output shaft support structure, such as Figure 1-Figure 3As shown, it includes: a low-speed planetary transmission component, and the low-speed planetary transmission component consists of a planet carrier 3, a planetary gear 1, a bearing 2, a sun gear 22, a first baffle 24, a second baffle 21, a positioning baffle 20, a ball top 19, and a first retaining spring 23; the sun gear 22 is floatingly mounted on the ball top 19; the first baffle 24 and the second baffle 21 are interference-fitted on the sun gear 22 and act as an oil seal; the low-speed planetary transmission component is floatingly mounted on the open gear 11 and transmits power through the spline wheel 15; the power is transmitted from the motor to the sun gear 22 through various levels of planetary transmission components, and the sun gear 22 drives the planetary gear 1 and the planet carrier 3 to rotate, and the planet carrier 3 transmits the power to the spline wheel 15, and then the spline wheel 15 outputs the power to the open gear 11; The lower body component is composed of a lower body 4, a third baffle 5, a first cylindrical roller bearing 6, an oil seal 7, a non-standard bearing inner ring 8, a second cylindrical roller bearing 9, a second retaining spring 10, an open gear 11, a fourth baffle 12, a fifth baffle 13, a sixth baffle 14, a spline wheel 15, a round nut 16, a third retaining spring 17, and a seventh baffle 18; the sixth baffle 14 and the seventh baffle 18 are interference-mounted on the spline wheel 15 and act as oil seals; the fifth baffle 13 is interference-mounted The fourth baffle 12 is interference-fitted on the open gear 11 and acts as an oil seal, and is limited by the second retaining spring 10; the fourth baffle 12 is interference-fitted on the open gear 11 and acts as a dust-proof device; the non-standard bearing inner ring 8 is interference-fitted on the open gear 11; the non-standard bearing inner ring 8 and the fourth baffle 12 are interference-fitted and locked with the open gear 11 by a round nut; the oil seal 7 is axially limited by the third retaining spring 17; the first cylindrical roller bearing 6 and the second cylindrical roller bearing 9 are limited by the fourth baffle 12, the lower body 4, and the non-standard bearing inner ring 8.
[0017] Compared with the prior art, the compact wind turbine reducer output shaft support structure described in the embodiment of the present invention has the following advantages: In the compact wind turbine reducer output shaft support structure provided by an embodiment of the present invention, since cylindrical roller bearings have no taper angle and no axial preload requirement, the axial dimension is reduced by about 30% and the bearing pitch is shortened by 15%-20%; and, through finite element simulation, the bearing arrangement angle and preload force distribution are optimized to ensure that the radial load-bearing capacity is equivalent to the original tapered bearing solution in the prior art; since the inner rings of the two rows of cylindrical roller bearings are merged into a single stepped non-standard part, and ribs are provided at both ends of the inner ring to constrain the rollers, the material utilization rate is increased by 25%, and the coaxiality error caused by split assembly can be avoided, which effectively improves the overall accuracy and stability of the transmission system, while simplifying the processing process, significantly reducing the number of parts, and effectively improving assembly efficiency, reducing production costs and time costs.
[0018] In actual application, such as Figure 1-Figure 3As shown, the outer ring of the first cylindrical roller bearing 6 and the outer ring of the second cylindrical roller bearing 9 are integrally formed with the support housing, thereby effectively reducing the number of parts and improving assembly accuracy.
[0019] Among them, such as Figure 1-Figure 3 As shown, the inner ring of the first cylindrical roller bearing 6 and the inner ring of the second cylindrical roller bearing 9 are combined into a single stepped non-standard part, and ribs are provided at both ends of the non-standard inner ring to constrain the rollers, thereby effectively preventing their axial movement.
[0020] Specifically, if Figure 1-Figure 3 As shown in the figure, the non-standard inner ring of the above-mentioned single stepped non-standard part is made of 20CrMnTi alloy steel. After carburizing and quenching treatment (surface hardness HRC60-62) and fine grinding, the roundness error is ≤0.003mm. Therefore, through precision forging and heat treatment processes, it can ensure sufficient strength and wear resistance, thereby effectively enhancing the load-bearing capacity and service life, and reducing maintenance costs.
[0021] Further, if Figure 1-Figure 3 As shown, one end of the non-standard inner ring of the above-mentioned single stepped non-standard part can be connected to the open gear 11 without a key by accurately calculating the interference, thereby effectively reducing assembly errors, improving transmission accuracy, ensuring coaxiality, and improving transmission efficiency and stability.
[0022] Furthermore, if Figure 1-Figure 3 As shown, the stepped portion of the non-standard inner ring of the above-mentioned single stepped non-standard part cooperates with the inner ring of the first cylindrical roller bearing 6 and the inner ring of the second cylindrical roller bearing 9 respectively, and realizes smooth transmission of power through the close contact between the roller and the raceway.
[0023] Furthermore, if Figure 1-Figure 3 As shown, the support housing is directly formed into the raceways of the outer rings of the first cylindrical roller bearing 6 and the second cylindrical roller bearing 9 by a precision forging process, and is nitrided to enhance the surface hardness of the raceways, thereby effectively extending the service life.
[0024] Furthermore, if Figure 1-Figure 3 As shown in the figure, the output shaft has a hollow structure, and the ratio of inner hole diameter to shaft diameter is 0.4~0.5, which helps to achieve lightweight output shaft, thereby effectively reducing material cost and overall machine weight. Topology optimization verification shows that the stiffness loss is less than 5%, and the amount of forging blank is reduced by about 40%.
[0025] The following describes in detail the installation sequence of the lower body components in the output shaft support structure of the compact wind turbine reducer provided by the embodiment of the present invention with reference to the accompanying drawings: (1) Install the fourth baffle 12, the fifth baffle 13, and the second retaining spring 10 on the open gear 11; (2) Install the non-standard bearing inner ring 8 on the open gear 11 with interference fit; (3) Install the oil seal 7 on the lower body 4 through the third retaining spring 17; (4) Install the first cylindrical roller bearing 6 on the lower body 4 and the second cylindrical roller bearing 9 on the non-standard bearing inner ring 8; (5) Assemble steps (2) and (4) together on the lower body 4; (6) Lock the third baffle 5 with the open gear 11 through the round nut 16; (7) Install the spline wheel 15 on the open gear 11.
[0026] 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 modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.
Claims
1. A compact wind power reducer output shaft support structure, characterized in that: include: A low-speed planetary transmission component, which consists of a planet carrier, planetary gears, bearings, a sun gear, a first baffle, a second baffle, a positioning baffle, a spherical top, and a first retaining spring; the sun gear is floatingly mounted on the spherical top; the first baffle and the second baffle are interference-fitted on the sun gear and act as oil seals; the low-speed planetary transmission component is floatingly mounted on an open gear and transmits power through a spline wheel; power is transmitted from a motor to the sun gear through various stages of the planetary transmission component, and the sun gear drives the planetary gears and the planet carrier to rotate, and the planet carrier transmits the power to the spline wheel, which then outputs the power to the open gear through the spline wheel; The lower body component is composed of a lower body, a third baffle, a first cylindrical roller bearing, an oil seal, an inner ring of a non-standard bearing, a second cylindrical roller bearing, a second retaining spring, the open gear, a fourth baffle, a fifth baffle, a sixth baffle, the spline wheel, a round nut, a third retaining spring, and a seventh baffle; the sixth baffle and the seventh baffle are interference-mounted on the spline wheel and act as an oil seal; the fifth baffle is interference-mounted on the open gear and acts as an oil seal, and is limited by the second retaining spring; the fourth baffle is interference-mounted on the open gear and acts as a dust-proof function; the inner ring of the non-standard bearing is interference-mounted on the open gear; the inner ring of the non-standard bearing and the fourth baffle are interference-fitted and locked with the open gear by a round nut; the oil seal is axially limited by the third retaining spring; the first cylindrical roller bearing and the second cylindrical roller bearing are limited by the fourth baffle, the lower body, and the inner ring of the non-standard bearing.
2. The compact wind power reducer output shaft support structure according to claim 1, characterized in that: The outer ring of the first cylindrical roller bearing and the outer ring of the second cylindrical roller bearing are integrally formed with the support housing.
3. The compact wind power reducer output shaft support structure according to claim 2, characterized in that: The inner ring of the first cylindrical roller bearing and the inner ring of the second cylindrical roller bearing are combined into a single stepped non-standard part, and ribs are provided at both ends of the non-standard inner ring to constrain the rollers.
4. The compact wind power reducer output shaft support structure according to claim 3, characterized in that: The non-standard inner ring of the single stepped non-standard part is made of 20CrMnTi alloy steel.
5. The compact wind power reducer output shaft support structure according to claim 4, characterized in that: One end of the non-standard inner ring of the single stepped non-standard part is connected to the open gear without a key by accurately calculating the interference.
6. The compact wind power reducer output shaft support structure according to claim 5, characterized in that: The stepped portion of the non-standard inner ring of the single stepped non-standard part cooperates with the inner ring of the first cylindrical roller bearing and the inner ring of the second cylindrical roller bearing respectively, and achieves smooth transmission of power through close contact between the roller and the raceway.
7. The compact wind power reducer output shaft support structure according to claim 6, characterized in that: The support housing is directly formed into the raceways of the outer rings of the first cylindrical roller bearing and the second cylindrical roller bearing by a precision forging process, and is nitrided to enhance the surface hardness of the raceways.
8. The compact wind power reducer output shaft support structure according to claim 1, characterized in that: The output shaft is a hollow structure, and the ratio of inner hole diameter to shaft diameter is 0.4~0.5.