Conducting ring sealing structure

Abstract

The utility model discloses a conducting ring sealing structure, which relates to the technical field of conducting rings and comprises an end cover, a rotating shaft, a sealing bearing and a conducting ring body. The rotating shaft penetrates through the center of the end cover and is in running fit with the end cover through a sealing bearing; a bearing pressing sleeve is arranged on the outer side of the sealing bearing, is fixed on the rotating shaft in an interference manner, and tightly presses an inner ring of the sealing bearing; a bearing inner cover is arranged on the inner side of the sealing bearing, the bearing inner cover is connected and fixed to the end cover, and the bearing inner cover tightly presses an outer ring of the sealing bearing; the conducting ring body is fixedly connected to the bearing inner cover, a conducting carbon brush is arranged on the conducting ring body, and the conducting carbon brush abuts against the rotating shaft; according to the scheme, the U-shaped sealing structure and the sealing shaft sleeve which are arranged in a mutually nested manner are adopted to form a labyrinth sealing structure, so that the problem of winding burnout caused by the fact that chips of a conductive carbon brush enter the interior of a motor is effectively prevented, and the service life of the motor is prolonged.

Description

Technical Field

[0001] This utility model relates to a conductive ring sealing structure and belongs to the field of conductive ring technology. Background Technology

[0002] The drive motor is the power source of electric vehicles. During the process of converting electrical energy into mechanical energy, shaft currents are generated at both ends of the drive motor bearings or between the shaft and the bearing, which may cause electrochemical corrosion and damage to the bearings. Shaft currents lead to electrochemical corrosion and damage to the bearings, affecting the normal operation and lifespan of the motor. Prolonged shaft currents can cause bearing failure, increasing maintenance costs and downtime. To reduce motor shaft currents and protect bearings from electrochemical corrosion, conductive rings are typically installed on both industrial motors and electric vehicle drive motors. The conductive ring consists of two main parts: a support structure and carbon brushes (conductive carbon fibers).

[0003] Currently, most motors with conductive rings mounted next to the bearings lack protective measures. When the motor operates, the rotating shaft generates rotational friction between the outer circumference of the shaft and the conductive fiber contact surface of the conductive ring. Prolonged contact and friction can cause the carbon fiber to wear into fragments. These fragments can enter the windings, leading to winding burnout. Furthermore, as the motor's operating temperature rises, the viscosity of the bearing grease decreases, increasing its fluidity. During bearing rotation, the grease can be flung out from the cavity between the inner and outer rings and adhere to the conductive fibers, affecting conductivity or even rendering them non-conductive. In severe cases, this can cause electro-corrosion of the motor bearing. Utility Model Content

[0004] The purpose of this invention is to provide a conductive ring sealing structure to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a conductive ring sealing structure, comprising an end cap, a rotating shaft, a sealing bearing, and a conductive ring body; the rotating shaft passes through the center of the end cap, and the rotating shaft is rotatably engaged with the end cap via the sealing bearing; a bearing sleeve is provided on the outer side of the sealing bearing, the bearing sleeve is interference-fitted onto the rotating shaft, and the bearing sleeve presses against the inner ring of the sealing bearing; an inner bearing cover is provided on the inner side of the sealing bearing, the inner bearing cover is connected and fixed to the end cap, and the inner bearing cover presses against the outer ring of the sealing bearing; the conductive ring body is connected and fixed to the inner bearing cover, and the conductive ring body... A conductive carbon brush is provided on the upper part of the conductive ring body, and the conductive carbon brush abuts against the rotating shaft; a sealing bushing is provided on the rotating shaft located inside the conductive ring body, and the sealing bushing is interference-fitted with the rotating shaft; the bearing inner cover has a U-shaped sealing structure at one end near the rotating shaft, and the cross-section of the sealing bushing is U-shaped. The U-shaped sealing structure of the bearing inner cover and the sealing bushing are nested together to form a labyrinth sealing structure, and the U-shaped sealing structure and the sealing bushing do not contact each other; an oil slinger ring is provided on the rotating shaft located outside the conductive ring body, and the oil slinger ring is interference-fitted with the rotating shaft. The oil slinger ring is disc-shaped, and the opening of the oil slinger ring faces the sealed bearing.

[0006] Preferably, the end of the rotating shaft is provided with a bearing sleeve retainer, a bearing retainer, and a conductive ring retainer in sequence from the outside to the inside. The diameter of the conductive ring retainer is larger than the diameter of the bearing retainer, and the diameter of the bearing retainer is larger than the diameter of the bearing sleeve retainer. The bearing sleeve is interference-fitted to the bearing sleeve retainer, the inner wall of the sealed bearing is interference-fitted to the bearing retainer, and the sealed bushing and the oil slinger ring are both interference-fitted to the conductive ring retainer.

[0007] Preferably, a cover plate is fixedly provided on the outer side of the end cap, and a sealing cavity is formed between the cover plate and the bearing sleeve. An oil seal is provided in the sealing cavity, and the oil seal is fixed on the cover plate and tightly abuts against the bearing sleeve.

[0008] Preferably, the oil seal has multiple sealing lips, and the oil seal is tightly abutted against the bearing sleeve through the multiple sealing lips.

[0009] Preferably, the oil seal is made of a flexible material.

[0010] Preferably, the bearing inner cover has a stop, through which the bearing inner cover presses against and seals the outer ring of the bearing.

[0011] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0012] 1. This utility model uses a nested U-shaped sealing structure and a sealing bushing to form a labyrinth sealing structure, which effectively prevents the burning of the windings caused by the entry of conductive carbon brush debris into the motor, thus extending the service life of the motor.

[0013] 2. By setting an oil slinger ring on the rotating shaft, when the grease in the sealed bearing is thrown out, it will be blocked by the oil slinger ring, thereby preventing the grease from affecting the conductive carbon brush, extending the life of the conductive carbon brush, and thus ensuring the effectiveness of the conductive ring body and extending the life of the whole machine.

[0014] 3. By setting a stepped shaft structure, on the one hand, it is easy to accurately install the bearing sleeve, sealed bearing, sealed bushing and oil slinger ring into their respective positions; on the other hand, it can accurately limit the axial position of the sealed bearing. In addition, the bearing sleeve and bearing inner cover press the sealed bearing from both sides, thereby effectively preventing the sealed bearing from moving on the shaft and improving the stability of operation. Attached Figure Description

[0015] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0016] Appendix Figure 1 This is a schematic diagram of a conductive ring sealing structure according to the present invention;

[0017] Appendix Figure 2 For the appendix Figure 1 Enlarged view of point A in the middle;

[0018] Appendix Figure 3 For the appendix Figure 1 Enlarged view of point B in the middle;

[0019] Appendix Figure 4 This is a schematic diagram of the structure of the end of the rotating shaft described in this utility model.

[0020] In the diagram: 1. End cap; 11. Cover plate; 2. Shaft; 21. Bearing sleeve retainer; 22. Bearing retainer; 23. Conductive ring retainer; 3. Sealed bearing; 4. Conductive ring body; 41. Conductive carbon brush; 5. Bearing sleeve; 6. Bearing inner cover; 61. U-shaped sealing structure; 62. Stop; 7. Sealed bushing; 8. Oil slinger ring; 9. Sealing cavity; 91. Oil seal; 911. Sealing lip. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] As attached Figure 1-2 As shown, the conductive ring sealing structure of this utility model includes an end cap 1, a rotating shaft 2, a sealing bearing 3, and a conductive ring body 4; the rotating shaft 2 passes through the center of the end cap 1, and the rotating shaft 2 is rotatably engaged with the end cap 1 through the sealing bearing 3; in this embodiment, the sealing bearing 3 has an inner ring and an outer ring, the inner ring of the sealing bearing 3 is connected and fixed to the rotating shaft 2, and the outer ring of the sealing bearing 3 is connected and fixed to the end cap 1.

[0023] A bearing sleeve 5 is provided on the outer side of the sealed bearing 3. The bearing sleeve 5 is interference-fitted onto the rotating shaft 2 and presses against the inner ring of the sealed bearing 3. An inner bearing cover 6 is provided on the inner side of the sealed bearing 3. The inner bearing cover 6 is fixed to the end cover 1 by bolts and presses against the outer ring of the sealed bearing 3. Specifically, the inner bearing cover 6 has a stop 62, and the inner bearing cover 6 presses against the outer ring of the sealed bearing 3 through the stop 62.

[0024] The conductive ring body 4 is connected and fixed to the bearing inner cover 6. A conductive carbon brush 41 is provided on the conductive ring body 4, and the conductive carbon brush 41 abuts against the rotating shaft 2. In this embodiment, the conductive carbon brush 41 is a conductive carbon fiber.

[0025] A sealing sleeve 7 is provided on the rotating shaft 2 located inside the conductive ring body 4, and the sealing sleeve 7 is interference-fitted with the rotating shaft 2. The bearing inner cover 6 has a U-shaped sealing structure 61 at one end near the rotating shaft 2. The cross-section of the sealing sleeve 7 is U-shaped. The U-shaped sealing structure 61 of the bearing inner cover 6 and the sealing sleeve 7 are nested together to form a labyrinth sealing structure. The U-shaped sealing structure 61 and the sealing sleeve 7 do not contact each other. This effectively prevents the debris of the conductive carbon brush 41 from entering the motor and causing the winding to burn out, thereby extending the service life of the motor.

[0026] An oil slinger ring 8 is provided on the rotating shaft 2 located outside the conductive ring body 4. The oil slinger ring 8 is interference-fitted with the rotating shaft 2. The oil slinger ring 8 is disc-shaped, and the opening of the oil slinger ring 8 faces the sealed bearing 3.

[0027] During operation, when the grease in the sealed bearing 3 is thrown out, it is blocked by the oil slinger ring 8, thereby preventing the grease from affecting the conductive carbon brush 41, extending the life of the conductive carbon brush 41, and thus ensuring the effectiveness of the conductive ring body 4 and extending the life of the whole machine.

[0028] As attached Figure 1 , 4 As shown, further, the end of the rotating shaft 2 is provided with a bearing sleeve 21, a bearing 22 and a conductive ring 23 in sequence from the outside to the inside. The diameter of the conductive ring 23 is larger than the diameter of the bearing 22, and the diameter of the bearing 22 is larger than the diameter of the bearing sleeve 21, thus forming a stepped rotating shaft 2 structure. In this embodiment, the bearing sleeve 5 is interference-fitted to the bearing sleeve 21, the inner wall of the sealed bearing 3 is interference-fitted to the bearing 22, and the sealed bushing 7 and the oil slinger ring 8 are both interference-fitted to the conductive ring 23.

[0029] By setting a stepped shaft 2 structure, on the one hand, it is convenient to accurately install the bearing sleeve 5, the sealed bearing 3, the sealed bushing 7 and the oil slinger ring 8 into their respective positions; on the other hand, it can accurately limit the axial position of the sealed bearing 3. In addition, the bearing sleeve 5 and the bearing inner cover 6 press the sealed bearing 3 from both sides, thereby effectively preventing the sealed bearing 3 from moving on the shaft 2 and improving the stability of operation.

[0030] As attached Figure 3 As shown, a cover plate 11 is fixedly installed on the outer side of the end cover 1. A sealing cavity 9 is formed between the cover plate 11 and the bearing sleeve 5. An oil seal 91 is installed in the sealing cavity 9. The oil seal 91 is fixed on the cover plate 11 and is tightly abutted against the bearing sleeve 5. Specifically, the oil seal 91 has multiple sealing lips 911. The oil seal 91 is tightly abutted against the bearing sleeve 5 through the multiple sealing lips 911, thereby preventing external dust and water from entering the sealed bearing 3 and affecting the operation of the sealed bearing 3.

[0031] In this embodiment, the oil seal 91 is made of a flexible material, such as rubber, fluororubber, or polytetrafluoroethylene.

[0032] The conductive ring sealing structure described in this utility model can be set at the joint between the front end cover and the rotating shaft of the motor, or at the joint between the rear end cover and the rotating shaft.

[0033] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model; all technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of protection of this utility model.

Claims

1. A conductive ring sealing structure, characterized in that: It includes an end cap (1), a rotating shaft (2), a sealed bearing (3), and a conductive ring body (4); the rotating shaft (2) passes through the center of the end cap (1), and the rotating shaft (2) is rotatably engaged with the end cap (1) through the sealed bearing (3); a bearing sleeve (5) is provided on the outer side of the sealed bearing (3), the bearing sleeve (5) is interference-fitted on the rotating shaft (2), and the bearing sleeve (5) presses against the inner ring of the sealed bearing (3); a bearing inner cover (6) is provided on the inner side of the sealed bearing (3), the bearing inner cover (6) is connected and fixed on the end cap (1), and the bearing inner cover (6) presses against the outer ring of the sealed bearing (3); the conductive ring body (4) is connected and fixed on the bearing inner cover (6), and a conductive carbon brush (41) is provided on the conductive ring body (4), the conductive carbon brush (41) 41) It abuts against the rotating shaft (2); a sealing bushing (7) is provided on the rotating shaft (2) located inside the conductive ring body (4), and the sealing bushing (7) is interference-fitted with the rotating shaft (2). The bearing inner cover (6) has a U-shaped sealing structure (61) at one end near the rotating shaft (2). The cross section of the sealing bushing (7) is U-shaped. The U-shaped sealing structure (61) of the bearing inner cover (6) and the sealing bushing (7) are nested together to form a labyrinth sealing structure. The U-shaped sealing structure (61) and the sealing bushing (7) do not contact each other. An oil slinger ring (8) is provided on the rotating shaft (2) located outside the conductive ring body (4). The oil slinger ring (8) is interference-fitted with the rotating shaft (2). The oil slinger ring (8) is disc-shaped, and the opening of the oil slinger ring (8) faces the sealing bearing (3).

2. The conductive ring sealing structure according to claim 1, characterized in that: The end of the rotating shaft (2) is provided with a bearing sleeve stop (21), a bearing stop (22) and a conductive ring stop (23) in sequence from the outside to the inside. The diameter of the conductive ring stop (23) is larger than the diameter of the bearing stop (22), and the diameter of the bearing stop (22) is larger than the diameter of the bearing sleeve stop (21). The bearing sleeve (5) is interference-fitted to the bearing sleeve stop (21), the inner wall of the sealed bearing (3) is interference-fitted to the bearing stop (22), and the sealed bushing (7) and the oil slinger ring (8) are both interference-fitted to the conductive ring stop (23).

3. The conductive ring sealing structure according to claim 1, characterized in that: A cover plate (11) is fixedly provided on the outside of the end cap (1). A sealing cavity (9) is formed between the cover plate (11) and the bearing sleeve (5). An oil seal (91) is provided in the sealing cavity (9). The oil seal (91) is fixed on the cover plate (11) and the oil seal (91) is tightly abutted against the bearing sleeve (5).

4. The conductive ring sealing structure according to claim 3, characterized in that: The oil seal (91) has multiple sealing lips (911), and the oil seal (91) is tightly abutted against the bearing sleeve (5) through the multiple sealing lips (911).

5. The conductive ring sealing structure according to claim 3, characterized in that: The oil seal (91) is made of flexible material.

6. The conductive ring sealing structure according to claim 1, characterized in that: The bearing inner cover (6) has a stop (62) through which the bearing inner cover (6) presses against the outer ring of the sealing bearing (3).

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