A metal retainer for a wind power three-row cylindrical roller bearing

Abstract

The application relates to a metal retainer of a wind power three-row cylindrical roller bearing, and belongs to the technical field of bearings. The metal retainer of the wind power three-row cylindrical roller bearing comprises a retainer body, the retainer body is a metal retainer, an oil passing groove group is arranged on the retainer body, and the oil passing groove group is used for guiding oil flow to cover the surface of the retainer body. The application has the effects of improving the mechanical performance and fatigue resistance of the axial retainer body, guaranteeing the wear resistance and lubrication performance of the retainer body, and guaranteeing the service life and reliability of the bearing.

Description

Technical Field

[0001] This application relates to the field of bearing technology, and in particular to a metal cage for a three-row cylindrical roller bearing for wind power. Background Technology

[0002] Wind turbine pitch bearings typically employ four-point contact ball bearings and three-row cylindrical roller bearings, among which, refer to Figure 1 A traditional three-row cylindrical roller bearing mainly includes an outer ring 7, an inner ring 8, axial cylindrical rollers 9, radial cylindrical rollers 10, an axial roller cage 11, and a radial roller cage 12. The outer ring 7 consists of upper and lower parts, and two rows of axial raceways 13 and one row of radial raceways 14 are formed between the outer ring 7 and the inner ring 8. Multiple axial roller cages 11 are provided, and multiple axial roller cages 11 are arranged sequentially in the axial raceways 13. Multiple radial roller cages 12 are arranged sequentially in the radial raceways 14. Multiple axial cylindrical rollers 9 are installed sequentially in the axial roller cages 11, and multiple radial cylindrical rollers 10 are installed sequentially in the radial roller cages 12.

[0003] In the aforementioned traditional three-row cylindrical roller bearings, the axial roller cage 11 is usually made of polyoxymethylene resin, or POM for short. Although POM material has good wear resistance, its mechanical properties and fatigue resistance are poor. During use, the axial roller cage 11 made of POM material is prone to fracture failure under large axial forces, which affects the service life and reliability of the bearing. Utility Model Content

[0004] To help improve the mechanical properties and fatigue resistance of the axial cage body, while ensuring the wear resistance and lubrication performance of the cage body, so as to guarantee the service life and reliability of the bearing, this application provides a metal cage for a wind power three-row cylindrical roller bearing.

[0005] The metal cage of a three-row cylindrical roller bearing for wind power provided in this application adopts the following technical solution: A metal cage for a three-row cylindrical roller bearing for wind power includes a cage body, wherein the cage body is a metal cage and an oil groove group is formed on the cage body, the oil groove group being used to guide the flow of grease to cover the surface of the cage body.

[0006] Preferably, the cage body is an aluminum alloy cage.

[0007] Preferably, the surface of the cage body is covered with a wear-resistant layer.

[0008] Preferably, the wear-resistant layer is a polyundecyl lactam resin layer.

[0009] Preferably, the thickness of the wear-resistant layer is 0.2mm-0.5mm.

[0010] Preferably, the oil groove group includes a plurality of first oil grooves, which are sequentially formed on the outer ring side of the cage body. The first oil grooves correspond one-to-one with the cylindrical rollers inside the cage body, and the first oil grooves penetrate the cage body along the axial direction of the cage body.

[0011] Preferably, the oil groove group further includes a plurality of second oil grooves, which are sequentially opened on the inner ring side of the cage body. The second oil grooves correspond one-to-one with the cylindrical rollers in the cage body, and the second oil grooves penetrate the cage body along the axial direction of the cage body.

[0012] Preferably, the oil groove group further includes a plurality of third oil grooves, which are sequentially opened on one side surface of the cage body along the axial direction, and a plurality of cylindrical rollers in the cage body are sequentially located between adjacent third oil grooves.

[0013] Preferably, the oil groove group further includes a plurality of fourth oil grooves, which are sequentially opened on the side surface of the cage body away from the third oil groove, and a plurality of cylindrical rollers in the cage body are sequentially located between adjacent fourth oil grooves.

[0014] Preferably, the oil groove group further includes a plurality of fifth oil grooves, all of which are formed on the cage body and are located on opposite sides of the first oil groove and the second oil groove in the axial direction.

[0015] In summary, this application includes the following beneficial technical effects: By designing the cage body as a metal cage, the metal material can effectively improve the mechanical properties and fatigue resistance of the axial cage body compared to the traditional POM material, thereby increasing the strength of the cage body. Furthermore, the oil groove group guides grease to cover the surface of the cage body, which helps to reduce the wear of the metal cage body and the bearing, improves the bearing lubrication performance, and thus helps to ensure the bearing's service life and reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a traditional three-row cylindrical roller bearing for wind power.

[0017] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.

[0018] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0019] Figure 4 This is a schematic diagram of the overall structure of a single cage body in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the overall structure of a single cage body from another perspective in an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Cage body; 2. First oil groove; 3. Second oil groove; 4. Third oil groove; 5. Fourth oil groove; 6. Fifth oil groove; 7. Outer ring; 8. Inner ring; 9. Axial cylindrical roller; 10. Radial cylindrical roller; 11. Axial roller cage; 12. Radial roller cage; 13. Axial raceway; 14. Radial raceway; 15. Placement cavity; 16. Outer ring cage guide surface; 17. Inner ring cage guide surface; 18. Inner ring raceway surface; 19. Outer ring raceway surface. Detailed Implementation

[0022] The following combination Figures 2-5 This application will be described in further detail.

[0023] This application discloses a metal cage for a three-row cylindrical roller bearing for wind power systems. (Refer to...) Figure 2 and Figure 3 The metal cage of the wind turbine three-row cylindrical roller bearing includes a cage body 1. The cage body 1 is used to be installed in the axial raceway of the wind turbine three-row cylindrical roller bearing as an axial roller cage. The cage body 1 has a plurality of placement cavities 15 along its circumference for placing axial cylindrical rollers. The axial cylindrical rollers correspond one-to-one with the placement cavities 15. Specifically, the cage body 1 is a metal cage. The cage body 1 has an oil groove group. The oil groove group is used to guide grease to cover the surface of the cage body 1.

[0024] By designing the cage body 1 as a metal cage, the metal material can effectively improve the mechanical properties and fatigue resistance of the axial cage body 1 compared to the traditional POM material, thereby increasing the strength of the cage body 1. Since the cage body 1 is made of metal, its wear is more significant compared to the traditional POM material. This application guides grease to cover the surface of the cage body 1 through the oil groove group, which helps to reduce the wear of the metal cage body 1 and the bearing, improve the bearing lubrication performance, and thus help to ensure the service life and reliability of the bearing.

[0025] Reference Figure 3 Furthermore, the cage body 1 is an aluminum alloy cage, which achieves a good balance between strength and toughness, and has good wear resistance and a low coefficient of friction. Specifically, the aluminum alloy cage is manufactured using an integral casting process, resulting in good integrity of the cage body 1. In other embodiments, the cage body 1 may also be made of materials such as stainless steel.

[0026] Reference Figure 4The surface of the cage body 1 is covered with a wear-resistant layer (not shown in the figure). The wear-resistant layer is a polyundecyllactam resin layer, abbreviated as PA11 layer. The polyundecyllactam resin layer has good wear resistance, and the thickness of the wear-resistant layer is 0.2mm-0.5mm, thus not affecting the strength of the cage body 1. Specifically, after the cage body 1 is integrally cast, the surface is sandblasted, and then PA11 material is coated onto the surface of the cage body 1 through dip coating treatment, so that the bonding strength can exceed 10Mpa. The wear-resistant layer effectively improves the wear resistance of the metal cage body 1.

[0027] Reference Figure 3 and Figure 4 To facilitate the guidance of grease to cover the surface of the cage body 1, the oil groove group includes multiple first oil grooves 2. The multiple first oil grooves 2 are sequentially opened on the outer ring side of the cage body 1, that is, the first oil grooves 2 are located on the side of the cage body 1 facing the outer ring 7. The multiple first oil grooves 2 are arranged at intervals along the circumference of the cage body 1. Specifically, the first oil grooves 2 correspond one-to-one with the cylindrical rollers in the cage body 1, and the first oil grooves 2 are aligned with the corresponding cylindrical rollers. The first oil grooves 2 penetrate the cage body 1 along the axial direction of the cage body 1.

[0028] When grease enters the axial raceway through the oil injection hole on the outer ring 7, the first oil groove 2 provides a channel for grease to enter other parts of the bearing and allows the grease to fully cover the outer ring surface of the cage body 1, thereby effectively improving the lubrication between the metal cage body 1 and the outer ring cage guide surface 16, which helps to ensure the service life and reliability of the bearing.

[0029] Reference Figure 3 and Figure 5 The oil groove assembly also includes multiple second oil grooves 3, which are sequentially opened on the inner ring side of the cage body 1. That is, the second oil grooves 3 are located on the side of the cage body 1 facing the inner ring 8. The first oil groove 2 and the second oil groove 3 are respectively located on opposite sides of the cage body 1. The multiple second oil grooves 3 are arranged at intervals along the circumference of the cage body 1. Specifically, the second oil grooves 3 correspond one-to-one with the cylindrical rollers in the cage body 1, and the second oil grooves 3 are aligned with the corresponding cylindrical rollers. The second oil grooves 3 penetrate the cage body 1 along the axial direction of the cage body 1.

[0030] When grease enters the axial raceway through the oil injection hole on the outer ring 7, the second oil groove 3 enables the grease to fully cover the inner ring surface of the cage body 1 and provides an axial channel for the grease to enter other parts of the bearing, effectively improving the lubrication between the metal cage body 1 and the inner ring cage guide surface 17, and ensuring the service life and reliability of the bearing.

[0031] Reference Figure 3 and Figure 5The oil groove assembly also includes multiple third oil grooves 4, which are sequentially formed on one side surface of the cage body 1 along the axial direction. Multiple cylindrical rollers within the cage body 1 are sequentially located between adjacent third oil grooves 4. Specifically, the third oil grooves 4 are located on the surface of the cage body 1 closest to the hub. During bearing operation, the third oil grooves 4 help prevent the cage body 1 from scraping away grease from the inner ring raceway surface 18 or the outer ring raceway surface 19 during movement, providing a grease lubrication channel for the inner or outer ring raceway lubrication, and preventing premature bearing failure due to insufficient oil in the inner or outer ring raceways.

[0032] Reference Figure 4 and Figure 5 The oil groove assembly also includes multiple fourth oil grooves 5, which are sequentially formed on the surface of the cage body 1 away from the third oil groove 4. That is, the fourth oil grooves 5 are located on the side of the cage body 1 closest to the blades. Multiple cylindrical rollers within the cage body 1 are sequentially positioned between adjacent fourth oil grooves 5. The fourth oil grooves 5 help guide grease into the placement cavity 15, increasing the contact area between the working surface of the cylindrical rollers and the grease. This ensures that sufficient grease enters the contact area between the cylindrical rollers and the placement cavity 15 of the cage body 1 during operation, improving lubrication at the contact point between the cylindrical rollers and the cage body 1.

[0033] Reference Figure 3 and Figure 4 The oil groove group also includes multiple fifth oil grooves 6, which are all opened on the cage body 1. The multiple fifth oil grooves 6 are located on opposite sides of the first oil groove 2 and the second oil groove 3 in the axial direction. That is, the fifth oil grooves 6 are distributed on opposite sides of the first oil groove 2 and the second oil groove 3 in the axial direction. The fifth oil grooves 6 are located on the edge of the cage body 1 and penetrate the cage body 1 radially.

[0034] The opening of the fifth oil groove 6 helps guide grease from the first oil groove 2 and the second oil groove 3 into the axial raceway and the placement cavity 15, which helps improve the lubrication in the axial raceway and avoids premature bearing failure due to lack of oil on the inner ring raceway surface 18 and the outer ring raceway surface 19. At the same time, it increases the contact area between the cylindrical roller end face and the grease, ensuring that there is enough grease at the contact position between the cylindrical roller end face and the cage body 1.

[0035] The implementation principle of this application embodiment is as follows: by designing the cage body 1 as an aluminum alloy cage, the aluminum alloy material can effectively improve the mechanical properties and fatigue resistance of the axial cage body 1 compared with the traditional POM material, and increase the strength of the cage body 1; while the design of the wear-resistant layer effectively improves the wear resistance of the metal cage body 1; furthermore, the setting of the first oil groove 2, the second oil groove 3, the third oil groove 4, the fourth oil groove 5 and the fifth oil groove 6 can guide the flow of grease entering from the oil injection hole, so that the grease can effectively cover the surface of the cage body 1, enhance the lubrication effect between the cage body 1 and the outer ring cage guide surface 16, between the cage body 1 and the inner ring cage guide surface 17, between the cage body 1 and the outer ring raceway surface 19, between the cage body 1 and the inner ring raceway surface 18, and between the cage body 1 and the cylindrical rollers, effectively reduce the wear of the metal cage body 1 and the bearing, improve the bearing lubrication performance, and thus ensure the service life and reliability of the bearing.

[0036] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A metal cage for a three-row cylindrical roller bearing for wind power, characterized in that: Includes a cage body (1), the cage body (1) is a metal cage, and an oiling groove group is formed on the cage body (1) to guide the flow of grease to cover the surface of the cage body (1).

2. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 1, characterized in that: The cage body (1) is an aluminum alloy cage.

3. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 1, characterized in that: The surface of the cage body (1) is covered with a wear-resistant layer.

4. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 3, characterized in that: The wear-resistant layer is a polyundecyl lactam resin layer.

5. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 4, characterized in that: The thickness of the wear-resistant layer is 0.2mm-0.5mm.

6. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 1, characterized in that: The oil groove group includes a plurality of first oil grooves (2), which are sequentially opened on the outer ring side of the cage body (1). The first oil grooves (2) correspond one-to-one with the cylindrical rollers in the cage body (1), and the first oil grooves (2) penetrate the cage body (1) along the axial direction of the cage body (1).

7. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 6, characterized in that: The oil groove group also includes a plurality of second oil grooves (3), which are sequentially opened on the inner ring side of the cage body (1). The second oil grooves (3) correspond one-to-one with the cylindrical rollers in the cage body (1), and the second oil grooves (3) penetrate the cage body (1) along the axial direction of the cage body (1).

8. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 7, characterized in that: The oil groove group also includes a plurality of third oil grooves (4), which are sequentially opened on one side surface of the cage body (1) in the axial direction, and a plurality of cylindrical rollers in the cage body (1) are sequentially located between adjacent third oil grooves (4).

9. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 8, characterized in that: The oil groove group also includes a plurality of fourth oil grooves (5), which are sequentially opened on the side surface of the cage body (1) away from the third oil groove (4), and a plurality of cylindrical rollers in the cage body (1) are sequentially located between adjacent fourth oil grooves (5).

10. The metal cage of a three-row cylindrical roller bearing for wind power according to claim 7, characterized in that: The oil groove group also includes a plurality of fifth oil grooves (6), which are all opened on the cage body (1) and are located on opposite sides of the first oil groove (2) and the second oil groove (3) respectively.

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