Wear-resistant bearing for an electric generator

Abstract

The utility model discloses a kind of wear-resistant bearings for generator, it is related to bearing technical field, the wear-resistant bearing includes bearing outer ring and bearing inner ring, the inner wall of bearing outer ring is equipped with first raceway, the inside of first raceway is provided with first spacer ring, the outer wall of bearing inner ring is equipped with second raceway, the inside of second raceway is provided with second spacer ring, roller and graphite column are alternately arranged between second raceway and first raceway along circumferential direction, the outside of bearing outer ring is provided with oil injection mechanism.The utility model is divided into two groups of roller and graphite column's bearing unit by first spacer ring,second spacer ring, both can disperse radial load, avoid single area stress concentration, can also reduce radial runout under high speed, adapt to generator high load working condition;Simultaneously, graphite column generates lubricating powder autonomously with operation, forms raceway lubricating film, further reduces the friction loss of roller and raceway.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically a wear-resistant bearing for generators. Background Technology

[0002] A direct-drive wind turbine is a type of wind turbine generator that eliminates the gearbox structure. Its rotor is directly connected to the main shaft of a low-speed permanent magnet synchronous generator. In this design, the main shaft bearing of the generator is the core mechanical component that bears the weight of the entire rotor, complex aerodynamic loads, and transmits huge torques. The role of the bearing is crucial: it not only needs to achieve low-friction, high-precision rotation of the main shaft and support the entire weight of the rotor and rotor assembly, but also must have excellent wear resistance, fatigue resistance, and impact resistance to cope with the multi-directional alternating loads caused by changes in wind direction and speed and the harsh working conditions of long-term continuous operation.

[0003] Existing bearings have difficulty balancing efficient self-lubrication and stable load-bearing capacity during use. Most of them adopt a single roller structure, which is prone to local stress concentration leading to accelerated wear. They also lack self-lubricating components and rely on periodic manual oiling for maintenance. After oiling, the sealing effect is poor, and problems such as grease leakage or the entry of external impurities are likely to occur.

[0004] Based on this, a wear-resistant bearing for generators is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a wear-resistant bearing for generators to solve the problem in the prior art of balancing efficient self-lubrication and stable load bearing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A wear-resistant bearing for a generator includes an outer ring and an inner ring. The inner wall of the outer ring has a first raceway and a first spacer ring is disposed inside the first raceway. The outer wall of the inner ring has a second raceway and a second spacer ring is disposed inside the second raceway. Rollers and graphite pillars are alternately arranged along the circumferential direction between the second raceway and the first raceway, and an oil injection mechanism is provided on the outside of the outer ring of the bearing.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative embodiment: the oil injection mechanism includes an oil injection pipe, which is fixedly installed on the outer wall of the bearing outer ring. An installation groove is formed on the outer wall of the bearing outer ring at the oil injection pipe. A limit ring is fixedly installed on the inner wall of the installation groove. A spring is placed on the top of the limit ring. A steel ball is set on the top of the spring and is located inside the installation groove. A top cover is provided on the top of the oil injection pipe. An oil injection hole is formed on the top of the top cover and is adapted to fit the steel ball.

[0008] In one alternative: a sealing ring is provided between the top cover and the steel ball.

[0009] In one alternative: a dust cover is provided between the end faces of the outer ring and the inner ring of the bearing.

[0010] In one alternative: the bearing inner ring includes a base layer, the surface of which is provided with a zirconium oxide coating, and the surface of which is provided with a thin dense chromium coating.

[0011] In one alternative: the surface of the thin chromium coating is provided with an alumina ceramic coating.

[0012] In one alternative: the surface of the alumina ceramic coating is provided with a DLC coating.

[0013] In one alternative: the DLC coating is a thin film composed of carbon atoms.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model divides the bearing units of rollers and graphite columns into two groups by using a first spacer and a second spacer. This can not only disperse the radial load and avoid stress concentration in a single area, but also reduce radial runout at high speeds, making it suitable for high-load conditions of generators. At the same time, the graphite columns generate lubricating powder on their own as they run, forming a lubricating film on the raceway, which further reduces the frictional loss between the rollers and the raceway.

[0015] 2. In this utility model, the oil injection mechanism can quickly replenish grease through the oil injection hole. The spring drives the steel ball to cooperate with the sealing ring to achieve a seal, which not only prevents grease leakage and continuously ensures the lubrication effect, but also blocks external impurities from entering. Maintenance can be carried out without frequent disassembly, reducing operation and maintenance costs.

[0016] 3. In this utility model, the multi-layer coating of the bearing inner ring synergistically improves hardness and wear resistance, and the low friction characteristics of the DLC coating further reduce friction loss. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2This is a schematic diagram of the roller mounting structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the oil injection mechanism of this utility model.

[0020] Figure 4 This is a schematic cross-sectional view of the bearing inner ring of this utility model.

[0021] Figure reference numerals: 1. Bearing outer ring; 2. Bearing inner ring; 21. Base layer; 22. Zirconia coating; 23. Thin dense chrome coating; 24. Alumina ceramic coating; 25. DLC coating; 3. First raceway; 4. First spacer; 5. Second raceway; 6. Second spacer; 7. Roller; 8. Graphite column; 9. Oil filling mechanism; 91. Oil filling pipe; 92. Mounting groove; 93. Limiting ring; 94. Spring; 95. Steel ball; 96. Top cover; 97. Oil filling hole; 10. Dust cover. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In one embodiment, such as Figures 1-4 As shown, a wear-resistant bearing for a generator includes an outer ring 1 and an inner ring 2. The inner wall of the outer ring 1 is provided with a first raceway 3, and a first spacer 4 is provided inside the first raceway 3. The outer wall of the inner ring 2 is provided with a second raceway 5, and a second spacer 6 is provided inside the second raceway 5. Rollers 7 and graphite pillars 8 are alternately arranged along the circumferential direction between the second raceway 5 and the first raceway 3, and an oil injection mechanism 9 is provided on the outside of the outer ring 1 of the bearing.

[0024] In this embodiment, the first spacer 4 divides the first raceway 3 into two segments, and the second spacer 6 divides the second raceway 5 into two segments. The two sets of rollers 7 and graphite pillars 8 forming the bearing units can not only disperse the radial load during bearing operation and avoid stress concentration in a single area that aggravates wear, but also improve the rotational stability of the bearing and reduce radial runout at high speeds, making it suitable for the high-load conditions of the generator. At the same time, the graphite pillars 8 in each unit can generate graphite lubricating powder by rubbing against the raceway as the bearing rotates, forming a lubricating film on the raceway surface, which helps to reduce frictional loss between the rollers 7 and the raceway, and further enhances the wear resistance of the bearing.

[0025] In one embodiment, such as Figure 1 and Figure 3As shown, the oil injection mechanism 9 includes an oil injection pipe 91, which is fixedly installed on the outer wall of the bearing outer ring 1. An installation groove 92 is formed on the outer wall of the bearing outer ring 1 at the oil injection pipe 91. A limiting ring 93 is fixedly installed on the inner wall of the installation groove 92. A spring 94 is placed on the top of the limiting ring 93, and a steel ball 95 is positioned on the top of the spring 94, located inside the installation groove 92. A top cover 96 is provided on the top of the oil injection pipe 91, and an oil injection hole 97 is formed on the top of the top cover 96. The oil injection hole 97 is compatible with the steel ball 95. A sealing ring is provided between the top cover 96 and the steel ball 95. Lubricating grease can be conveniently added through the oil injection hole 97. Under the action of the spring 94, the steel ball 95 fits against the oil injection hole 97, and a reliable seal is achieved with the sealing ring, preventing grease leakage and preventing external impurities from entering, thus continuously ensuring the lubrication effect of the raceway and rollers 7.

[0026] In one embodiment, such as Figure 1 and Figure 2 As shown, a dust cover 10 is provided between the end faces of the outer ring 1 and the inner ring 2 of the bearing. The dust cover 10 on the end faces of the outer ring 1 and the inner ring 2 of the bearing can effectively block external dust and moisture from entering the raceway area, prevent impurities from adhering to the surface of the rollers 7 and graphite pillars 8, prevent them from aggravating raceway wear, and maintain a clean operating environment inside the bearing.

[0027] In one embodiment, such as Figure 1 and Figure 4 As shown, the bearing inner ring 2 includes a base layer 21, the surface of which is provided with a zirconia coating 22, the surface of which is provided with a thin dense chromium coating 23, the surface of which is provided with an alumina ceramic coating 24, and the surface of which is provided with a DLC coating 25. The DLC coating 25 is a thin film composed of carbon atoms. The multi-layer coating synergistically improves the hardness and wear resistance of the inner ring. At the same time, the low friction characteristics of the DLC coating 25 can reduce frictional loss with the roller 7 and extend the service life of the bearing.

[0028] The above embodiment discloses a wear-resistant bearing for a generator. The first raceway 3 of the outer ring 1 is divided into two segments by a first spacer 4, and the second raceway 5 of the inner ring 2 is divided into two segments by a second spacer 6. This forms two independent sets of rollers 7 and graphite pillars 8 bearing units, distributing the load, avoiding stress concentration in a single raceway area, and reducing the risk of localized wear between the raceway and rollers 7. The two sets of units work together to reduce radial runout of the bearing, adapting to high-speed generator operation. During operation, the rollers 7 in each unit bear the main radial load, reducing frictional resistance; while the graphite pillars 8 assist in bearing load, as the bearing rotates and rubs against the raceway, the graphite powder they generate adheres to the raceway surface, forming a lubricating film, reducing frictional loss between the rollers 7, graphite pillars 8, and the raceway. The surface of the base layer 21 is sequentially covered with a zirconium oxide coating 22, a thin dense chromium coating 23, an alumina ceramic coating 24, and a DLC coating 25. The multi-layer hard, low-friction coating significantly improves the wear resistance and corrosion resistance of the bearing inner ring 2. The dust cover 10 on the end face of the bearing outer ring 1 and the bearing inner ring 2 can prevent external dust and moisture from entering the raceway area, ensuring internal cleanliness and preventing impurities from aggravating wear. When grease needs to be added, connect the grease injection device to the grease injection hole 97 of the top cover 96, press the steel ball 95 to compress the spring 94 and disengage it from the sealing surface of the grease injection pipe 91, and the grease will be injected into the two sets of raceway units through the grease injection pipe 91; after the grease injection is completed, the spring 94 returns to its original position and pushes the steel ball 95 to fit against the grease injection hole 97, which, together with the sealing ring, achieves a seal and prevents grease leakage.

[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wear-resistant bearing for a generator, comprising an outer ring (1) and an inner ring (2), wherein a first raceway (3) is provided on the inner wall of the outer ring (1), and a first spacer (4) is provided inside the first raceway (3); a second raceway (5) is provided on the outer wall of the inner ring (2), and a second spacer (6) is provided inside the second raceway (5). Its features are, Rollers (7) and graphite columns (8) are alternately arranged in the circumferential direction between the second raceway (5) and the first raceway (3), and an oil injection mechanism (9) is provided on the outside of the bearing outer ring (1).

2. The wear-resistant bearing for a generator according to claim 1, characterized in that, The oil injection mechanism (9) includes an oil injection pipe (91), which is fixedly installed on the outer wall of the bearing outer ring (1). An installation groove (92) is provided on the outer wall of the bearing outer ring (1) at the oil injection pipe (91). A limit ring (93) is fixedly installed on the inner wall of the installation groove (92). A spring (94) is placed on the top of the limit ring (93). A steel ball (95) is provided on the top of the spring (94), and the steel ball (95) is located inside the installation groove (92). A top cover (96) is provided on the top of the oil injection pipe (91). An oil injection hole (97) is provided on the top of the top cover (96), and the oil injection hole (97) is compatible with the steel ball (95).

3. The wear-resistant bearing for a generator according to claim 2, characterized in that, A sealing ring is provided between the top cover (96) and the steel ball (95).

4. The wear-resistant bearing for a generator according to claim 1, characterized in that, A dust cover (10) is provided between the end faces of the outer ring (1) and the inner ring (2) of the bearing.

5. A wear-resistant bearing for a generator according to claim 1, characterized in that, The bearing inner ring (2) includes a base layer (21), the surface of which is provided with a zirconium oxide coating (22), and the surface of which is provided with a thin dense chromium coating (23).

6. The wear-resistant bearing for a generator according to claim 5, characterized in that, The surface of the thin chromium coating (23) is provided with an alumina ceramic coating (24).

7. A wear-resistant bearing for a generator according to claim 6, characterized in that, The surface of the alumina ceramic coating (24) is provided with a DLC coating (25).

8. A wear-resistant bearing for a generator according to claim 7, characterized in that, The DLC coating (25) is a thin film composed of carbon atoms.

Images