A three-row column variable-pitch bearing simulation method

Abstract

The application provides a three-row cylindrical variable-pitch bearing simulation method, relates to the technical field of simulation and modeling, and establishes a three-dimensional model of a three-row cylindrical variable-pitch bearing, which comprises a bearing inner ring, a bearing outer ring, axial rollers and radial rollers; two rings of axial rollers and one ring of radial rollers are located between the bearing inner ring and the bearing outer ring; the application divides each axial roller and each radial roller into N spring units, and N is greater than or equal to 7; the initial gap between each spring unit and the bearing inner ring and the bearing outer ring is independently set according to the respective shapes of the axial rollers and the radial rollers, namely, the gaps between each spring unit and the bearing inner ring and the bearing outer ring are not completely the same; the force bearing condition of the rollers in the raceway is influenced by various factors such as load and roller shape, and the adoption of the unit division structure can truly reflect the force bearing condition of the rollers in the raceway, correctly simulate the finite element force transmission path of the rollers and the region where the rollers are located, and thus more accurately analyze the force bearing condition of the three-row cylindrical bearing.

Description

Technical Field

[0001] This invention relates to the field of simulation technology, and more particularly to a simulation method for a three-row column pitch bearing. Background Technology

[0002] Pitch bearings are one of the most important components in wind turbine generator sets, and their stress conditions directly affect the safety of the entire unit. The stress calculation of pitch bearings is based on the finite element method. In recent years, with the continuous increase in the capacity of wind turbine generator sets, design bottlenecks have emerged in pitch ball bearing development, including insufficient raceway life to meet design requirements (20 years) and inadequate bearing ring damage.

[0003] There is a need to develop new pitch bearings / systems, primarily to address the problems of excessive circumferential stress in the bearing raceways leading to failure and edge crushing (excessive elliptical truncation) causing raceway failure. With these issues becoming increasingly prominent, replacing traditional ball bearings with three-row roller bearings is imperative, necessitating the analysis of their stress conditions. While the analysis and calculation of ball bearing pitch bearings are well-established, the analysis and calculation of three-row roller bearings are still in the exploratory stage, and this technology is currently unavailable. Previous analyses of double-row roller bearings did not consider roller modification, resulting in incalculable errors.

[0004] For those skilled in the art, how to more accurately analyze the stress conditions of three-row column bearings is a technical problem that needs to be solved. Summary of the Invention

[0005] This invention provides a simulation method for a three-row column pitch bearing, which can more accurately analyze the stress situation of the three-row column bearing. The specific solution is as follows:

[0006] A simulation method for a three-row column pitch bearing includes:

[0007] A three-dimensional model of a three-row column pitch bearing is established. The three-dimensional model includes the bearing inner ring, the bearing outer ring, two rings of axial rollers, and one ring of radial rollers.

[0008] Each axial roller and each radial roller is divided into N spring units, where N≥7; the initial clearance between each spring unit and the inner ring and outer ring of the bearing is set independently according to the shape of each axial roller and radial roller.

[0009] Optionally, the bearing outer ring includes an independent upper outer ring and a lower outer ring, wherein the upper outer ring includes a first upper outer ring and a second upper outer ring that are independently divided into grids; the first upper outer ring contacts the axial rollers, and the second upper outer ring contacts the radial rollers.

[0010] The number of grids in the first upper outer ring is an integer multiple of the number of grids in the axial roller; the number of grids in the second upper outer ring is an integer multiple of the number of grids in the radial roller.

[0011] Optionally, the bearing inner ring and blade, the bearing upper outer ring and lower outer ring, and the bearing lower outer ring and hub all adopt standard contact, wherein the coefficient of friction is 0.3.

[0012] Optionally, the bearing inner ring includes a first inner ring and a second inner ring that are independently divided into grids; the second inner ring is annular, and its outer side is provided with a groove for accommodating the radial rollers; the first inner ring contacts the axial rollers;

[0013] The number of grids in the first inner ring is an integer multiple of the number of grids in the axial roller; the number of grids in the second inner ring is an integer multiple of the number of grids in the radial roller.

[0014] Optionally, the first upper outer ring and the second upper outer ring adopt MPC contact;

[0015] The first inner ring and the second inner ring use MPC contact.

[0016] Optionally, the spring unit divided by the axial roller and the radial roller adopts the Combin39 unit, and the spring unit is set to be in a compressed state only.

[0017] Optionally, the inner ring bolts corresponding to the inner ring of the bearing and the outer ring bolts corresponding to the outer ring of the bearing are respectively equipped with Beam188 units and Beam4 units, wherein the screw part is equipped with Beam188 units and the threaded section is equipped with Beam4 units.

[0018] Optionally, the inner ring meshing teeth on the inner wall of the bearing inner ring are separately divided into a grid, and the inner ring meshing teeth and the bearing inner ring are in MPC contact.

[0019] Optionally, the bearing inner ring and the gasket, and the bearing outer ring and the gasket are all in bonded contact.

[0020] This invention provides a simulation method for a three-row column pitch bearing. A three-dimensional model of the bearing is established, comprising an inner ring, an outer ring, axial rollers, and radial rollers. Two rings of axial rollers and one ring of radial rollers are located between the inner and outer rings. This invention divides each axial and radial roller into N spring units, where N≥7. The initial clearance between each spring unit and the inner and outer rings is independently set based on the shape of each axial and radial roller. That is, the clearances between each spring unit and the inner and outer rings are not entirely identical. The stress on the rollers in the raceway is affected by load, roller shape, and other factors. This unit division structure can realistically reflect the stress on the rollers in the raceway, correctly simulate the finite element force transmission path of the rollers and their surrounding area, and thus more accurately analyze the stress on the three-row column bearing. 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 only 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 cross-sectional view of a partial section of the simulation model of a three-row column pitch bearing.

[0023] Figure 2 A cross-sectional mesh diagram of a local section of a simulation model of a three-row column pitch bearing;

[0024] Figure 3 This is a partial cross-sectional isometric schematic diagram of a simulation model of a three-row column pitch bearing.

[0025] The image includes:

[0026] Bearing inner ring 1, first inner ring 11, second inner ring 12, bearing outer ring 2, bearing upper outer ring 21, first upper outer ring 211, second upper outer ring 212, bearing lower outer ring 22, axial roller 3, radial roller 4, inner ring meshing teeth 5. Detailed Implementation

[0027] The core of this invention lies in providing a simulation method for a three-row column pitch bearing, which can more accurately analyze the stress situation of the three-row column bearing.

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the simulation method of the three-row column pitch bearing of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] This invention provides a simulation method for a three-row column pitch bearing, comprising the following steps:

[0030] A three-dimensional model of a three-row pitch bearing is established. The model includes the inner ring 1, the outer ring 2, two rings of axial rollers 3, and one ring of radial rollers 4. Combined with... Figure 1 , Figure 2 , Figure 3 The bearing inner ring 1 and bearing outer ring 2 are two independent structures. Between the inner ring 1 and the outer ring 2, two rings of axial rollers 3 and one ring of radial rollers 4 are arranged. The axial rollers 3 bear axial forces, and the radial rollers 4 bear radial forces. The two rows of axial rollers 3 are located on the same axis. Each ring of axial rollers 3 and each ring of radial rollers 4 contains multiple independently arranged rollers, which cooperate to jointly bear the forces between the inner ring 1 and the outer ring 2. Figure 1 The vertical direction is the axial direction, and the horizontal direction is the radial direction.

[0031] Each axial roller 3 and each radial roller 4 is divided into N spring units, where N ≥ 7. The initial clearance between each spring unit and the inner ring 1 and outer ring 2 of the bearing is independently set according to the respective shapes of the axial roller 3 and radial roller 4. Both the axial roller 3 and radial roller 4 are used to bear the pressure between the inner ring 1 and outer ring 2 of the bearing. Each roller is independently divided into several spring units, and each spring unit is subjected to compressive force.

[0032] Combination Figure 1 Two rows of axial rollers 3 are used to bear axial forces, and the spring units of the axial rollers 3 are arranged in a transverse manner; the radial rollers 4 are used to bear radial forces, and the spring units of the radial rollers 4 are arranged in a vertical manner.

[0033] The simulation model of the three-row column pitch bearing constructed in this invention considers the self-molding of the axial rollers 3 and radial rollers 4. Each spring unit independently sets the initial clearance between itself and the inner ring 1 and outer ring 2 of the bearing. That is, the initial clearance of each spring unit may be equal or unequal. In contrast, the traditional method, which does not consider the roller molding, treats the rollers as standard cylinders with completely equal clearances at all positions. The model constructed in this invention fully considers the roller molding factor and uses it as the initial condition when setting the spring units. When the axial rollers 3 and radial rollers 4 are compressed, because the initial clearances of each spring unit are not completely equal, the stiffness changes after compression are not completely consistent. This allows for a realistic simulation of the stress state of the rollers and a correct simulation of the finite element force transmission path of the rollers and their surrounding area, thereby more accurately analyzing the stress situation of the three-row column bearing.

[0034] Based on the above scheme, combined with Figure 1The bearing outer ring 2 includes an independent upper outer ring 21 and a lower outer ring 22. The bearing outer ring 2 is formed by combining two separate structures, namely the upper outer ring 21 and the lower outer ring 22, which are not a single integral structure; while the upper outer ring 21 and the lower outer ring 22 are each integral structures.

[0035] The bearing upper outer ring 21 includes a first upper outer ring 211 and a second upper outer ring 212 that are independently divided into grids. The first upper outer ring 211 and the second upper outer ring 212 together form an integral bearing upper outer ring 21. The first upper outer ring 211 and the second upper outer ring 212 are only divided into grids when dividing the grid, but the bearing upper outer ring 21 composed of the first upper outer ring 211 and the second upper outer ring 212 is an integral structure.

[0036] The first upper outer ring 211 contacts the axial roller 3, and the second upper outer ring 212 contacts the radial roller 4; the first upper outer ring 211 bears the force of the axial roller 3, and the second upper outer ring 212 bears the force of the radial roller 4.

[0037] Normally, the number of axial rollers 3 and radial rollers 4 is not an integer multiple. The upper outer ring 21 of the bearing is divided into two parts and the grid is divided independently. In order to avoid grid division problems, the present invention divides the number of grids of the first upper outer ring 211 into an integer multiple of the number of grids of the axial rollers 3; and divides the number of grids of the second upper outer ring 212 into an integer multiple of the number of grids of the radial rollers 4.

[0038] Specifically, in this application, the inner ring 1 of the bearing and the blade, the upper outer ring 21 of the bearing and the lower outer ring 22 of the bearing, and the lower outer ring 22 of the bearing and the hub all adopt standard contact, with a friction coefficient of 0.3 for each. These three contact relationships all adopt standard contact and need to be set in the finite element simulation software.

[0039] The bearing inner ring 1 includes a first inner ring 11 and a second inner ring 12, which are independently divided into grids. The second inner ring 12 is annular, and its outer side is provided with a groove for accommodating the radial rollers 4, that is, the second inner ring 12 contacts the radial rollers 4; the first inner ring 11 contacts the axial rollers 3; the second inner ring 12 bears the force of the radial rollers 4, and the first inner ring 11 bears the force of the axial rollers 3.

[0040] Normally, the number of axial rollers 3 and radial rollers 4 is not an integer multiple. The outer ring 21 of the bearing is divided into two parts and the grid is divided independently. In order to avoid grid division problems, the number of grids in the first inner ring 11 is an integer multiple of the number of grids in the axial rollers 3; the number of grids in the second inner ring 12 is an integer multiple of the number of grids in the radial rollers 4.

[0041] Specifically, the first upper outer ring 211 and the second upper outer ring 212 form an integral bearing upper outer ring 21, and the first inner ring 11 and the second inner ring 12 form an integral bearing inner ring 1. Therefore, the first upper outer ring 211 and the second upper outer ring 212 in this invention adopt MPC contact; the first inner ring 11 and the second inner ring 12 adopt MPC contact; the contact form needs to be set in the finite element simulation software.

[0042] The spring elements for axial roller 3 and radial roller 4 are defined using Combin39 elements, and the spring elements are set to be under compression only. The Combin39 element is a unidirectional element with nonlinear functionality, which can be used to input generalized force-deformation curves.

[0043] The bearing inner ring 1 is connected and fixed by inner ring bolts, and the bearing outer ring 2 is connected and fixed by outer ring bolts. The inner ring bolts corresponding to the bearing inner ring 1 and the outer ring bolts corresponding to the bearing outer ring 2 adopt Beam188 units and Beam4 units respectively. The screw part adopts Beam188 units, and the threaded section adopts Beam4 units.

[0044] The inner ring meshing teeth 5 on the inner wall of the bearing inner ring 1 are separately meshed, and the inner ring meshing teeth 5 and the bearing inner ring 1 use MPC contact. The inner ring meshing teeth 5 and the bearing inner ring 1 are an integral structure; the contact form needs to be set in the finite element simulation software.

[0045] The inner ring 1 of the bearing is in contact with the gasket, and the outer ring 2 of the bearing is in contact with the gasket. Therefore, the inner ring 1 and the gasket are in a bonded contact, and the outer ring 2 and the gasket are in a bonded contact. The contact configuration needs to be set in the finite element simulation software.

[0046] This invention fills the gap in existing modeling of three-row column pitch bearings and addresses the shortcomings of existing technologies in roller bearing modeling. This invention considers roller modification, resulting in more accurate roller force distribution, improves the detailed modeling method for three-row column pitch bearings, establishes the correct bearing transmission mechanism, and makes the finite element results more reliable and trustworthy in pitch bearing calculations.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of simulation of a three-row column variable pitch bearing, characterized in that, The application relates to a three-dimensional model of a three-row column variable-pitch bearing, which comprises a bearing inner ring (1), a bearing outer ring (2), two rows of axial rollers (3) and one row of radial rollers (4). Each of the axial rollers (3) and each of the radial rollers (4) is divided into N spring units, and N is greater than or equal to 7; the axial rollers (3) and the radial rollers (4) consider the modification of the rollers themselves, and the initial gap between each spring unit and the bearing inner ring (1) or the bearing outer ring (2) is independently set according to the respective shapes of the axial rollers (3) and the radial rollers (4). The bearing outer ring (2) comprises a bearing upper outer ring (21) and a bearing lower outer ring (22) which are independent of each other, the bearing upper outer ring (21) comprises a first upper outer ring (211) and a second upper outer ring (212) which are independently divided into grids; the first upper outer ring (211) contacts the axial rollers (3), and the second upper outer ring (212) contacts the radial rollers (4). The number of grids divided by the first upper outer ring (211) is in an integer multiple relationship with the number of grids divided by the axial rollers (3); and the number of grids divided by the second upper outer ring (212) is in an integer multiple relationship with the number of grids divided by the radial rollers (4). The bearing inner ring (1) comprises a first inner ring (11) and a second inner ring (12) which are independently divided into grids; the second inner ring (12) is annular, and a groove for accommodating the radial rollers (4) is arranged on the outer side of the second inner ring (12); and the first inner ring (11) contacts the axial rollers (3). The number of grids divided by the first inner ring (11) is in an integer multiple relationship with the number of grids divided by the axial rollers (3); and the number of grids divided by the second inner ring (12) is in an integer multiple relationship with the number of grids divided by the radial rollers (4). The bearing inner ring (1), the blade, the bearing upper outer ring (21), the bearing lower outer ring (22) and the hub are all in standard contact, and the friction coefficients are all 0.

3.

2. The three-row column variable pitch bearing simulation method of claim 1, wherein, The first upper outer ring (211) and the second upper outer ring (212) adopt MPC contact.

3. The three-row column variable pitch bearing simulation method according to claim 1 or 2, characterized in that, The first inner ring (11) and the second inner ring (12) adopt MPC contact. The spring units divided by the axial rollers (3) and the radial rollers (4) adopt Combin39 units, and the spring units are set to be in a compression state only.

4. The three-row column variable pitch bearing simulation method of claim 1, wherein, The inner ring bolts corresponding to the bearing inner ring (1) and the outer ring bolts corresponding to the bearing outer ring (2) respectively adopt Beam188 units and Beam4 units, wherein the screw rod part adopts the Beam188 unit, and the threaded section adopts the Beam4 unit.

5. The three-row column variable pitch bearing simulation method of claim 1, wherein, The inner ring engaging teeth (5) arranged on the inner wall of the bearing inner ring (1) are independently divided into grids, and the inner ring engaging teeth (5) adopt MPC contact with the bearing inner ring (1).

6. The three-row column variable pitch bearing simulation method of claim 1, wherein, The bearing inner ring (1) and the gasket, and the bearing outer ring (2) and the gasket all adopt binding contact.

7. The three-row column variable pitch bearing simulation method of claim 1, wherein, ​

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