Self-aligning roller bearing for wind generating set

Abstract

The utility model relates to the technical field of self-aligning roller bearings, and discloses a self-aligning roller bearing for a wind generating set, which comprises an inner ring, a retainer arranged on the outer side of the inner ring, a roller mechanism arranged on the side surface of the retainer, an outer ring arranged on the outer side of the retainer, a first roller and a second roller, the first roller and the second roller adopt the asymmetric contact angle design, the contact angles of the first roller and the second roller are different through the asymmetric contact angle design of the rollers, the row with the larger contact angle bears axial force, the first roller and the second roller are the same as a traditional roller in size, and the first roller and the second roller are matched with the fixed middle flange design jointly, so that the axial force is reduced. The axial bearing capacity of the bearing can be effectively improved, the overall robustness is improved, the first wear-resistant coating and the second wear-resistant coating are arranged, abrasion between the first roller and the surface of the raceway and abrasion between the second roller and the surface of the raceway can be effectively reduced, and the abrasion is particularly prominent under the mixed friction working condition.

Description

Technical Field

[0001] The utility model relates to the technical field of spherical roller bearings, and more specifically to a spherical roller bearing for a wind power generation unit. Background Art

[0002] A wind power generation unit is a device that uses wind energy to generate electricity. Its main components include a wind turbine generator, a tower, rotor blades, a control system, a power transmission system, etc.

[0003] The main shaft of a wind power generation unit usually uses a spherical roller bearing to support and carry the weight and load of rotating components. A spherical roller bearing is a specially designed rolling bearing, and its inner ring has a free tilting angle with the shaft, which can compensate for slight deviations or offsets between the shaft and the bearing housing. This characteristic makes the spherical roller bearing particularly suitable under high-speed rotation and complex load conditions, especially in the application of the main shaft of a wind power generation unit.

[0004] After long-term use of the existing spherical roller bearings, due to the fretting between the rollers and the raceways, corrosion will occur in the load-bearing areas of the outer raceway of the inner ring and the inner raceway of the outer ring, black-brown spots will appear, wear and even fatigue fracture will occur, wear will occur on both sides of the rollers, and due to the poor positional accuracy of the transmission chain components, the floating function will fail, resulting in deformation and wear of the cage, and the entire row of rollers will exceed the raceway surface, causing slipping. Summary of the Utility Model

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a spherical roller bearing for a wind power generation unit to solve the problems existing in the above-mentioned background art.

[0006] The utility model provides the following technical solution: a spherical roller bearing for a wind power generation unit, including an inner ring, a cage is arranged on the outer side of the inner ring, a roller mechanism is arranged on the side surface of the cage, an outer ring is arranged on the outer side of the cage, the roller mechanism includes a first roller and a second roller, and the first roller and the second roller adopt an asymmetric contact angle design.

[0007] Further, an inner raceway is opened on the inner side of the outer ring, an inner raceway is opened on the outer side of the inner ring, and both the first roller and the second roller are adapted to the surfaces of the inner raceway and the outer raceway.

[0008] Further, the cage is made of copper alloy material, and a fixed middle rib is arranged in the middle on the outer side of the inner ring.

[0009] Further, an annular groove is arranged on the outer side of the outer ring, and lubricating holes are opened on the surface of the inner side of the annular groove.

[0010] Further, the surfaces of the first roller and the second roller are provided with a first wear-resistant coating and a second wear-resistant coating.

[0011] Further, the material of the first wear-resistant coating is one of nickel and chromium, and the material of the second wear-resistant coating is one of tungsten, tungsten carbide or titanium nitride.

[0012] Technical effects and advantages of the present utility model:

[0013] 1. By adopting the design of asymmetric contact angles of the rollers in the present utility model, the contact angles of the first roller and the second roller are different, and the row with the larger contact angle bears the axial force. The first roller and the second roller have the same size as the traditional rollers. Through the combined cooperation with the fixed middle rib design, the axial load-bearing capacity of the bearing can be effectively improved, and the overall robustness can be enhanced.

[0014] 2. By providing the first wear-resistant coating and the second wear-resistant coating in the present utility model, the wear between the first roller and the second roller and the raceway surface can be effectively reduced, which is particularly prominent under the mixed friction working condition. Description of the drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0016] Figure 2 It is a schematic diagram of the outer ring structure of the present utility model.

[0017] Figure 3 It is a schematic cross-sectional structure diagram of the present utility model.

[0018] Reference numerals are: 1, inner ring; 101, fixed middle rib; 2, cage; 3, roller mechanism; 301, first roller; 302, second roller; 4, outer ring; 401, annular groove; 402, lubrication hole. Detailed implementation manners

[0019] Next, the technical solutions in the present utility model will be clearly and completely described in conjunction with the drawings in the present utility model. In addition, the forms of each structure described in the following implementation manners are only examples, and a spherical roller bearing for a wind power generation unit involved in the present utility model is not limited to the structures described in the following implementation manners. All other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0020] Refer to Figures 1 - 3, the present utility model provides a spherical roller bearing for a wind turbine generator, which includes an inner ring 1. A cage 2 is arranged on the outer side of the inner ring 1. A roller mechanism 3 is arranged on the side surface of the cage 2. An outer ring 4 is arranged on the outer side of the cage 2. The roller mechanism 3 includes a first roller 301 and a second roller 302, and the first roller 301 and the second roller 302 adopt an asymmetric contact angle design.

[0021] In the traditional spherical roller bearing, the contact angles of the two rows of rolling elements are the same. In this application, an asymmetric contact angle design is adopted, so that the contact angles of the first roller 301 and the second roller 302 are different. The row with the larger contact angle bears the axial force. The first roller 301 and the second roller 302 have the same size as the traditional rollers. Through the combined cooperation with the design of the fixed middle rib 101, the axial load-bearing capacity of the bearing can be effectively improved, and the overall robustness can be enhanced.

[0022] In a preferred embodiment, an inner raceway is provided on the inner side of the outer ring 4, and an inner raceway is provided on the outer side of the inner ring 1. Both the first roller 301 and the second roller 302 are adapted to the surfaces of the inner raceway and the outer raceway. The first roller 301 and the second roller 302 can effectively reduce the wear at specific positions of the bearing through profile modification, and reduce the risk of early surface failure.

[0023] In a preferred embodiment, the cage 2 is made of copper alloy. A fixed middle rib 101 is arranged in the middle on the outer side of the inner ring 1. The copper alloy material has high heat resistance and corrosion resistance, and can withstand high working temperatures and harsh working conditions.

[0024] In a preferred embodiment, an annular groove 401 is provided on the outer side of the outer ring 4, and a lubricating hole 402 is provided on the surface inside the annular groove 401. Lubricating oil can be added between the inner ring 1 and the outer ring 4 through the lubricating hole 402.

[0025] In a preferred embodiment, a first wear-resistant coating and a second wear-resistant coating are provided on the surfaces of the first roller 301 and the second roller 302. The material of the first wear-resistant coating is one of nickel and chromium, and the material of the second wear-resistant coating is one of tungsten, tungsten carbide or titanium nitride. Through the setting of the first wear-resistant coating and the second wear-resistant coating, the wear between the first roller 301 and the second roller 302 and the raceway surface can be effectively reduced, which is particularly prominent under mixed friction conditions.

[0026] Working principle of the utility model: In this application, an asymmetric contact angle design is adopted, so that the contact angles of the first roller 301 and the second roller 302 are different. The row with the larger contact angle bears the axial force. The first roller 301 and the second roller 302 have the same size as the traditional rollers. Through the combined cooperation with the design of the fixed middle rib 101, the axial load-bearing capacity of the bearing can be effectively improved, and the overall robustness can be enhanced. The first roller 301 and the second roller 302 can effectively reduce the wear at specific positions of the bearing through profiling, and reduce the risk of early surface failure. Through the setting of the first wear-resistant coating and the second wear-resistant coating, the wear between the first roller 301 and the second roller 302 and the raceway surface can be effectively reduced, especially prominent under the mixed friction working condition.

[0027] Finally, several points should be noted: First, in the description of this application, it should be noted that unless otherwise specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the internal communication of two components, and can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0028] Secondly: In the attached drawings of the disclosed embodiments of the utility model, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the usual design. Without conflict, the same embodiment and different embodiments of the utility model can be combined with each other;

[0029] Finally: The above are only the preferred embodiments of the utility model and are not used to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A spherical roller bearing for a wind turbine generator, comprising an inner ring (1), characterized in that: A retaining frame (2) is arranged on the outer side of the inner ring (1), a roller mechanism (3) is arranged on the side of the retaining frame (2), an outer ring (4) is arranged on the outer side of the retaining frame (2), the roller mechanism (3) comprises a first roller (301) and a second roller (302), and the first roller (301) and the second roller (302) are designed with asymmetric contact angles.

2. The spherical roller bearing for a wind turbine generator set according to claim 1, characterized in that: An inner raceway is provided on the inner side of the outer ring (4), and an inner raceway is provided on the outer side of the inner ring (1). The first roller (301) and the second roller (302) are both adapted to the inner raceway surface and the outer raceway surface.

3. The spherical roller bearing for a wind turbine generator set according to claim 1, characterized in that: The retaining frame (2) is made of copper alloy, and a fixed middle rib (101) is provided in the middle of the outer side of the inner ring (1).

4. The spherical roller bearing for a wind turbine generator set according to claim 1, characterized in that: An annular groove (401) is provided on the outer side of the outer ring (4), and a lubrication hole (402) is provided on the inner surface of the annular groove (401).

5. The spherical roller bearing for a wind turbine generator set according to claim 1, characterized in that: The surfaces of the first roller (301) and the second roller (302) are provided with a first wear-resistant coating and a second wear-resistant coating.

6. The spherical roller bearing for a wind turbine generator set according to claim 5, characterized in that: The material of the first wear-resistant coating is one of nickel and chromium, and the material of the second wear-resistant coating is one of tungsten, tungsten carbide or titanium nitride.

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