AC generator rotor bearing protection structure

Abstract

The utility model discloses an AC generator rotor bearing protection structure, which is applied to the field of generators and comprises a motor shell, an end cover is mounted on the surface of the motor shell, and a rotor shaft is arranged on the inner wall of the end cover; heat of the bearing is conducted to the heat dissipation fins through the first heat conduction plate, the heat dissipation fins rotate to rapidly dissipate the heat, the purpose of heat dissipation can be achieved, the stability of the bearing is guaranteed, the service life is prolonged, meanwhile, the first heat conduction plate can protect the outer side of the bearing, the protection effect is improved, and the service life of the bearing is prolonged. Heat generated during rotation of the bearing is conducted into the annular oil storage cavity through the first heat conduction ring and the second heat conduction ring, so that the temperature of the annular oil storage cavity is increased, lubricating oil and air in the annular oil storage cavity are heated to expand, and the lubricating oil enters a bearing raceway from capillary micropores for lubrication, and the purpose of having the lubricating function can be achieved; the stability of the bearing is ensured, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of generators, and in particular to a rotor bearing protection structure for an AC generator. Background Technology

[0002] A search of Chinese patents revealed publication number CN215487254U, which discloses a generator rotor bearing protection structure. This structure is installed on the rear end bearing supporting the generator rotor shaft. A carbon brush is located on the rear side of the rear end bearing, and a bearing cover is provided on the outer side of the rear end bearing. The inner ring of the bearing cover is interference-fitted with the rotor shaft and press-fitted laterally onto the inner ring cage of the rear end bearing. The upper end of the side of the bearing cover is clearance-fitted with the outer ring side of the rear end bearing. This invention uses a V-shaped bearing cover press-fitted onto the end of the rear end bearing. Without affecting the normal operation of the rear end bearing, the inclined edge of the bearing cover towards the carbon brush effectively blocks carbon dust generated after carbon brush wear from entering the rear end bearing, preventing carbon dust from entering the rear end bearing and causing damage to the rear end bearing, thus preventing generator malfunction.

[0003] In summary, this protective structure lacks heat dissipation functionality. It consists of a bearing cover installed inside the bearing to protect it. However, bearings generate heat during operation, and if this heat is not dissipated promptly, it reduces bearing stability and lifespan, making it inconvenient to use. Furthermore, it lacks lubrication; insufficient lubrication during operation increases friction and generates significant heat, further impacting bearing stability and lifespan. To address these issues, we propose an AC generator rotor bearing protection structure. Utility Model Content

[0004] The purpose of this invention is to provide a protection structure for the rotor bearing of an AC generator, which has the advantages of heat dissipation and lubrication functions.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an AC generator rotor bearing protection structure, including a motor housing, an end cover installed on the surface of the motor housing, a rotor shaft provided on the inner wall of the end cover, carbon brushes installed on the surface of the rotor shaft, a fixing seat fixedly sleeved on the inner wall of the end cover, a bearing installed on the inner wall of the fixing seat, and the bearing fixedly sleeved with the rotor shaft, a first heat-conducting plate bolted to the surface of the inner ring of the bearing, and the first heat-conducting plate penetrating the rotor shaft, and heat dissipation fins integrally formed on the surface of the first heat-conducting plate.

[0006] By adopting the above technical solution, the heat of the bearing is conducted to the heat dissipation fins through the first heat conduction plate. The heat dissipation fins then rotate to quickly dissipate the heat, thus achieving the purpose of heat dissipation, ensuring the stability of the bearing, and improving its service life. At the same time, the first heat conduction plate can protect the outside of the bearing, improving the protection effect.

[0007] The present invention is further configured such that: a first heat-conducting ring is fixedly sleeved on the inner wall of the fixed base, and the first heat-conducting ring is located between the inner wall of the fixed base and the bearing; an annular oil storage cavity is formed on the inner wall of the fixed base; a second heat-conducting ring is fixedly sleeved on the inner wall of the annular oil storage cavity; a heat-conducting block is provided between the second heat-conducting ring and the first heat-conducting ring; a second heat-conducting plate is bolted to the surface of the first heat-conducting ring, and the second heat-conducting plate is fixedly sleeved with the second heat-conducting ring; and capillary micropores are formed on the inner wall of the fixed base and the outer ring of the bearing, and the two capillary micropores are connected to each other.

[0008] By adopting the above technical solution, the heat generated when the bearing rotates is conducted to the annular oil reservoir through the first and second heat-conducting rings, which raises the temperature of the annular oil reservoir. This causes the lubricating oil and air inside to expand due to the heat, allowing the lubricating oil to enter the bearing raceway through the capillary micropores for lubrication. This method achieves the purpose of lubrication, ensures the stability of the bearing, and improves its service life.

[0009] The present invention is further configured such that a baffle is fixedly sleeved on the surface of the rotor shaft.

[0010] By adopting the above technical solution, a baffle is set to protect the inner side of the bearing, preventing carbon brush powder from entering the bearing and improving the protection effect.

[0011] The present invention is further configured such that: an oil injection hole is provided on the surface of the fixed base, and a sealing block is threadedly connected to the inner wall of the oil injection hole.

[0012] The above technical solution involves sealing the oil injection hole by setting a sealing block.

[0013] The present invention is further configured such that: both the surface of the first heat-conducting plate and the baffle are embedded with sealing rings, and the sealing rings are made of modified fluororubber.

[0014] By adopting the above technical solution and setting a sealing ring, the sealing performance is improved and the anti-slip effect is enhanced. The modified fluororubber sealing ring has the advantages of low friction, wear resistance, high temperature resistance and good dynamic stability.

[0015] The present invention is further configured such that a lubrication groove is formed on the inner wall of the outer ring of the bearing.

[0016] By adopting the above technical solution, a lubrication groove is set. The diameter of the lubrication groove is small, which can form a hydrodynamic lubricating oil film, reduce the coefficient of friction, and store wear debris.

[0017] The present invention is further configured such that the heat dissipation fins are made of aluminum alloy.

[0018] By adopting the above technical solution, the heat dissipation fins are made of aluminum alloy, which has good thermal conductivity and is lightweight.

[0019] In summary, this utility model has the following beneficial effects:

[0020] 1. This utility model uses a first heat-conducting plate to conduct the heat of the bearing to the heat dissipation fins. The heat dissipation fins rotate to quickly dissipate the heat, which can achieve the purpose of heat dissipation, ensure the stability of the bearing, and improve its service life. At the same time, the first heat-conducting plate can protect the outside of the bearing, thus improving the protection effect.

[0021] 2. This utility model utilizes the heat generated during bearing rotation, which is conducted to the annular oil reservoir through the first and second heat-conducting rings. This raises the temperature of the annular oil reservoir, causing the internal lubricating oil and air to expand due to the heat. The lubricating oil then enters the bearing raceway through the capillary micropores for lubrication. This method achieves the purpose of lubrication, ensures the stability of the bearing, and improves its service life. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural view of the present invention;

[0023] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0024] Figure 3 This is a side sectional view of the structure of this utility model;

[0025] Figure 4 This is a utility model Figure 2 Enlarged view of the structure at point A in the middle.

[0026] Reference numerals in the attached drawings: 1. Motor housing; 2. End cover; 3. Rotor shaft; 4. Carbon brush; 5. Mounting base; 6. Bearing; 7. First heat-conducting plate; 8. Heat dissipation fins; 9. First heat-conducting ring; 10. Annular oil reservoir; 11. Second heat-conducting ring; 12. Heat-conducting block; 13. Second heat-conducting plate; 14. Capillary micropores; 15. Baffle; 16. Oil injection hole; 17. Sealing block; 18. Sealing ring; 19. Lubrication groove. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1:

[0029] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4An AC generator rotor bearing protection structure includes a motor housing 1, an end cover 2 mounted on the surface of the motor housing 1, a rotor shaft 3 disposed on the inner wall of the end cover 2, carbon brushes 4 mounted on the surface of the rotor shaft 3, a fixing seat 5 fixedly sleeved on the inner wall of the end cover 2, a bearing 6 mounted on the inner wall of the fixing seat 5, and the bearing 6 fixedly sleeved with the rotor shaft 3, a first heat-conducting plate 7 bolted to the surface of the inner ring of the bearing 6, and the first heat-conducting plate 7 penetrating the rotor shaft 3, and heat dissipation fins 8 integrally formed on the surface of the first heat-conducting plate 7, the heat of the bearing 6 is conducted to the heat dissipation fins 8 through the first heat-conducting plate 7, and the heat dissipation fins 8 dissipate the heat quickly by rotating, thereby achieving the purpose of heat dissipation, ensuring the stability of the bearing 6, improving the service life, and at the same time, the first heat-conducting plate 7 can protect the outside of the bearing 6, improving the protection effect.

[0030] refer to Figure 2 and Figure 4 A baffle 15 is fixedly sleeved on the surface of the rotor shaft 3. By setting the baffle 15, the inner side of the bearing 6 is protected, preventing carbon brush powder from entering the bearing 6 and improving the protection effect.

[0031] refer to Figure 2 and Figure 4 Both the first heat-conducting plate 7 and the baffle 15 have embedded sealing rings 18, and the sealing rings 18 are made of modified fluororubber. By setting the sealing rings 18, the sealing performance is improved and the anti-slip effect is enhanced. The modified fluororubber sealing rings 18 have the advantages of low friction, wear resistance, high temperature resistance and good dynamic stability.

[0032] refer to Figure 1 and Figure 2 The heat dissipation fins 8 are made of aluminum alloy, which has good thermal conductivity and is lightweight.

[0033] Example 2:

[0034] refer to Figure 2 , Figure 3 and Figure 4A first heat-conducting ring 9 is fixedly sleeved on the inner wall of the fixed base 5, and the first heat-conducting ring 9 is located between the inner wall of the fixed base 5 and the bearing 6. An annular oil storage cavity 10 is opened on the inner wall of the fixed base 5, and a second heat-conducting ring 11 is fixedly sleeved on the inner wall of the annular oil storage cavity 10. A heat-conducting block 12 is provided between the second heat-conducting ring 11 and the first heat-conducting ring 9. A second heat-conducting plate 13 is bolted to the surface of the first heat-conducting ring 9, and the second heat-conducting plate 13 is fixedly sleeved with the second heat-conducting ring 11. Both the inner wall of the fixed base 5 and the surface of the outer ring of the bearing 6 are provided with capillary micropores 14, and the two capillary micropores 14 are connected. The heat generated when the bearing 6 rotates is conducted to the annular oil storage cavity 10 through the first heat-conducting ring 9 and the second heat-conducting ring 11, which raises the temperature of the annular oil storage cavity 10. The lubricating oil and air inside the cavity expand due to the heat, and the lubricating oil enters the raceway of the bearing 6 through the capillary micropores 14 for lubrication. This method can achieve the purpose of lubrication, ensure the stability of the bearing 6, and improve its service life.

[0035] refer to Figure 4 The surface of the fixed base 5 is provided with an oil injection hole 16, and the inner wall of the oil injection hole 16 is threaded with a sealing block 17. By setting the sealing block 17, the oil injection hole 16 is blocked.

[0036] refer to Figure 3 The inner wall of the outer ring of bearing 6 is provided with a lubrication groove 19. By setting the lubrication groove 19, the diameter of the lubrication groove 19 is small, which can form a dynamic pressure lubricating oil film, reduce the friction coefficient, and store wear debris.

[0037] Brief description of the usage process: The first heat-conducting plate 7 conducts heat from the bearing 6 to the heat dissipation fins 8. The heat dissipation fins 8 dissipate the heat. The rotation of the rotor shaft drives the inner ring of the bearing 6 to rotate, which in turn drives the first heat-conducting plate 7 to rotate. The rotation of the first heat-conducting plate 7 drives the heat dissipation fins 8 to rotate. The rotation of the heat dissipation fins 8 accelerates the airflow around them, quickly dissipating the heat. The faster the rotor shaft 3 rotates, the better the heat dissipation effect, thus achieving the purpose of heat dissipation. The annular oil reservoir 10 is filled with lubricating oil, provided the bearing 6 is at a normal temperature. Because the capillary micropores 14 have a small diameter and the annular oil reservoir 10 is in a sealed state, the lubricating oil will not flow out of the capillary micropores 14 on its own. The heat generated by the bearing 6 during operation is conducted to the heat-conducting block 12 through the first heat-conducting ring 9, and then from the heat-conducting block 12 to the second heat-conducting ring 11. The temperature of the second heat-conducting ring 11 increases, which raises the temperature of the lubricating oil and air in the oil reservoir. The increased temperature of the lubricating oil and air causes them to expand due to heat, which increases the pressure in the oil reservoir. The increased pressure in the oil reservoir forces the lubricating oil to be discharged through the capillary micropores 14 into the pipe of the bearing 6, thus lubricating the bearing 6 and achieving the purpose of lubrication.

[0038] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A rotor bearing protection structure for an alternator, comprising a motor housing (1), characterized in that, An end cover (2) is installed on the surface of the motor housing (1). A rotor shaft (3) is provided on the inner wall of the end cover (2). A carbon brush (4) is installed on the surface of the rotor shaft (3). A fixing seat (5) is fixedly sleeved on the inner wall of the end cover (2). A bearing (6) is installed on the inner wall of the fixing seat (5). The bearing (6) is fixedly sleeved with the rotor shaft (3). A first heat-conducting plate (7) is bolted to the surface of the inner ring of the bearing (6). The first heat-conducting plate (7) is through the rotor shaft (3). A heat dissipation fin (8) is integrally formed on the surface of the first heat-conducting plate (7).

2. The AC generator rotor bearing protection structure according to claim 1, characterized in that, The inner wall of the fixed seat (5) is fixedly fitted with a first heat-conducting ring (9), and the first heat-conducting ring (9) is located between the inner wall of the fixed seat (5) and the bearing (6). The inner wall of the fixed seat (5) is provided with an annular oil storage cavity (10). The inner wall of the annular oil storage cavity (10) is fixedly fitted with a second heat-conducting ring (11). A heat-conducting block (12) is provided between the second heat-conducting ring (11) and the first heat-conducting ring (9). A second heat-conducting plate (13) is bolted to the surface of the first heat-conducting ring (9), and the second heat-conducting plate (13) is fixedly fitted with the second heat-conducting ring (11). The inner wall of the fixed seat (5) and the surface of the outer ring of the bearing (6) are both provided with capillary micropores (14), and the two capillary micropores (14) are connected to each other.

3. The AC generator rotor bearing protection structure according to claim 1, characterized in that, A baffle (15) is fixedly sleeved on the surface of the rotor shaft (3).

4. The AC generator rotor bearing protection structure according to claim 1, characterized in that, The surface of the fixed base (5) is provided with an oil injection hole (16), and the inner wall of the oil injection hole (16) is threaded with a sealing block (17).

5. The AC generator rotor bearing protection structure according to claim 3, characterized in that, Both the first heat-conducting plate (7) and the baffle (15) have embedded sealing rings (18) on their surfaces, and the sealing rings (18) are made of modified fluororubber.

6. The AC generator rotor bearing protection structure according to claim 1, characterized in that, The bearing (6) has a lubrication groove (19) on the inner wall of its outer ring.

7. The AC generator rotor bearing protection structure according to claim 1, characterized in that, The heat dissipation fins (8) are made of aluminum alloy.

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