A bearing sealing structure of a mine dump truck generator

Abstract

The utility model discloses a kind of bearing sealing structure of mine dump truck generator, comprising: rotor, end cover, rotating bearing, bearing inner cover, inner oil retaining ring, oil throwing disc, bearing outer cover A, bearing outer cover B, outer oil retaining ring, the end cover is the shell end cover of generator, shell end cover is equipped with the mounting hole for installing rotor, one end of the rotor is installed in the mounting hole by rotating bearing;Sealing pressure balance cavity and balance pressure device are further provided, the pressure of bearing chamber on the inside and outside of generator is balanced by sealing pressure balance cavity, to prevent grease loss, extend grease injection time;By setting storage waste grease cavity, the problem that new lubricating grease and waste lubricating grease coexist in one cavity is solved, and the lubrication effect is improved;The structure is compact, and maintenance cost is low.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology for heavy mining vehicles, specifically to a bearing sealing structure for a generator in a mining dump truck. Background Technology

[0002] The generator uses forced air cooling. Air enters the motor through the inlet at the generator extension end, carries away heat through the internal ventilation channels of the windings, and exits through the outlet at the non-shaft extension end. When air flows in from the generator extension end inlet, it blows directly into the extension end bearing housing, creating a negative pressure in the bearing housing area. This pressure imbalance causes grease to leak into the motor, contaminating the stator windings and rotor. At best, excessive grease loss leads to high bearing temperatures; at worst, it causes the bearings to seize. Grease entering the generator can carbonize at high temperatures inside, forming conductive substances that degrade insulation performance, cause winding short circuits, and ultimately lead to generator burnout. Therefore, a solution that can completely isolate grease, balance pressure, and adapt to harsh operating conditions is urgently needed.

[0003] Existing generator bearing housing sealing structures primarily employ mechanical labyrinth seals: the bearing housing is formed by the interplay of end covers, bearings, outer bearing covers, inner bearing covers, and oil retaining rings. This structure has a single function, serving only a sealing purpose.

[0004] In response to the above situation, the following issues mainly need to be addressed: This addresses the issue of grease loss in the motor bearing housing caused by pressure differences.

[0005] The existing structure is simple and lacks a cavity for storing waste grease. New grease and waste grease coexist in one cavity, resulting in both new and waste grease providing lubrication and reducing the lubrication effect. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a bearing sealing structure for a mining dump truck generator, thus solving the aforementioned problems.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a bearing sealing structure for a mining dump truck generator, comprising: a rotor, an end cover, a rotary bearing, an inner bearing cover, an inner oil baffle ring, an oil slinger, an outer bearing cover A, an outer bearing cover B, and an outer oil baffle ring. The end cover is the housing end cover of the generator, and the housing end cover is provided with a mounting hole for mounting the rotor. One end of the rotor is mounted in the mounting hole through a rotary bearing. The inner and outer oil baffles are fitted onto the rotor shaft and are located on the inner and outer sides of the rotary bearing. The oil slinger is located on the outer oil baffle. The inner oil baffle, outer oil baffle, and oil slinger rotate with the rotor shaft. The bearing inner cover is located inside the housing end cover and abuts against the inner end face of the outer ring of the rotating bearing. The bearing inner cover and the inner oil baffle ring form a mechanical labyrinth seal, and an inner grease reservoir is formed between the bearing inner cover, the inner oil baffle ring, and the inner end face of the rotating bearing. The bearing outer cover B is located outside the housing end cover and abuts against the outer end face of the outer ring of the rotary bearing. There is a reserved oil slinger gap between the bearing outer cover B, the outer oil baffle ring, the oil slinger, and the outer end face of the rotary bearing to form an outer grease reservoir. Bearing outer cover A rests against bearing outer cover B and forms a mechanical labyrinth seal with the outer oil retaining ring; The outer bearing cover B, the outer bearing cover A, the oil slinger, and the outer oil retainer ring form a waste grease storage cavity. The inner grease storage cavity and the outer grease storage cavity are connected through the gap of the rotating bearing. The lubricant flowing into the outer grease storage cavity is thrown into the waste grease storage cavity through the oil slinger.

[0008] Furthermore, the waste grease storage chamber is also equipped with an oil drain box, which is embedded in the bearing outer cover A, and the oil drain box is located at the bottom of the waste grease storage chamber.

[0009] Furthermore, a sealing pressure balancing cavity is provided, which includes: a left axial cavity, a right axial cavity, an inner radial pressure balancing cavity, and an outer radial pressure balancing cavity. The inner radial pressure balancing cavity and the outer radial pressure balancing cavity are connected through the left axial cavity and the right axial cavity.

[0010] Furthermore, the annular groove in the inner cover of the bearing, facing the inner oil baffle ring, forms an inner radial pressure balance cavity with the end face of the inner oil baffle ring; the annular groove in the outer cover A of the bearing, facing the outer oil baffle ring, forms an outer radial pressure balance cavity with the end face of the outer oil baffle ring.

[0011] Furthermore, the bearing outer cover A is provided with a left oil passage A and a right oil passage A, the bearing outer cover B is provided with a left oil hole A corresponding to the left oil passage A and a right oil hole A corresponding to the right oil passage A, the bearing inner cover is provided with a left oil passage B and a right oil passage B, and the mounting holes for mounting the rotor on the housing end cover are respectively provided with connecting oil passage A for connecting the left oil passage A and the left oil passage B and connecting oil passage B for connecting the right oil passage A and the right oil passage B.

[0012] Furthermore, the left axial cavity is formed by the interconnection of left oil passage A, left oil hole A, connecting oil passage A, and left oil passage B, while the right axial cavity is formed by the interconnection of right oil passage A, right oil hole A, connecting oil passage B, and right oil passage B.

[0013] Furthermore, the left oil passage A and the right oil passage A are connected to the outer radial pressure balance chamber, and the left oil passage B and the right oil passage B are connected to the inner radial pressure balance chamber.

[0014] Furthermore, the bearing outer cover A is provided with a pressure balancing device, which includes: two pressure balancing ports on the bearing outer cover A that are connected to the left oil passage A and the right oil passage A, a waterproof, dustproof and breathable membrane and a louvered protective cover provided on the pressure balancing ports.

[0015] Furthermore, an oil injection channel is provided, which consists of an oil injection hole located at the mounting hole on the end cover of the housing for mounting the rotor and an oil injection hole located on the outer ring of the rotary bearing. The oil injection channel is connected to an external pipeline through an oil injection pipe.

[0016] The beneficial effects of this utility model are: 1) The pressure in the bearing chambers on both sides of the generator is balanced by the sealed pressure balancing chamber, which prevents grease loss and extends the grease injection time; 2) By setting up a waste grease storage chamber, the problem of new and waste grease coexisting in one chamber was solved, thus improving the lubrication effect; 3) When a pressure difference is formed between the pressure balancing chamber and the external environment, the pressure balancing device realizes the exchange of internal and external gases, balances the pressure, and prevents the loss of lubricating grease; 4) The structure is compact and has low maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the end face structure of this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 3 for Figure 2 A magnified schematic diagram of the middle section I; Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 5 for Figure 4 A magnified schematic diagram of the middle II section; In the diagram: 1. Rotor; 2. Outer oil baffle ring; 3. Bearing outer cover A; 4. Oil slinger; 5. Bearing outer cover B; 6. Housing end cover; 7. Oil injection pipe; 8. Bearing inner cover; 9. Inner oil baffle ring; 10. Rotary bearing; 11. Oil drain box; 12. Louvered protective cover; 13. Right oil passage A; 14. Connecting oil passage B; 15. Right oil passage B; 16. Inner radial pressure balance chamber; 17. Left oil passage B; 18. Connecting oil passage A; 19. Left oil hole A; 20. Left oil passage A; 21. Outer radial pressure balance chamber; 22. Right oil hole A; 23. Inner grease reservoir; 24. Outer grease reservoir; 25. Waste grease storage chamber; 26. Waterproof, dustproof, and breathable membrane; 27. Pressure balance port. Detailed Implementation

[0018] 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. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0020] like Figure 1-5 As shown, a bearing sealing structure for a mining dump truck generator includes: a rotor 1, an end cover, a rotary bearing 10, an inner bearing cover 8, an inner oil baffle ring 9, an oil slinger 4, an outer bearing cover A3, an outer bearing cover B5, and an outer oil baffle ring 2. The end cover is the generator housing end cover 6, and the housing end cover 6 is provided with a mounting hole for mounting the rotor 1. One end of the rotor 1 is mounted in the mounting hole through the rotary bearing 10. The inner oil baffle ring 9 and the outer oil baffle ring 2 are fitted on the rotating shaft of the rotor 1 and are set on the inner and outer sides of the rotating bearing 10. The oil slinger 4 is set on the outer oil baffle ring 2. The inner oil baffle ring 9, the outer oil baffle ring 2, and the oil slinger 4 rotate with the rotating shaft of the rotor 1. The bearing inner cover 8 is located inside the housing end cover 6 and abuts against the inner end face of the outer ring of the rotary bearing 10. The bearing inner cover 8 and the inner oil baffle ring 9 form a mechanical labyrinth seal. An inner grease reservoir 23 is formed between the bearing inner cover 8, the inner oil baffle ring 9, and the inner end face of the rotary bearing 10. The bearing outer cover B5 is located outside the housing end cover 6 and abuts against the outer end face of the outer ring of the rotary bearing 10. There is a reserved oil slinger gap between it and the oil slinger 4. The outer cover B5, the outer oil baffle ring 2, the oil slinger 4, and the outer end face of the rotary bearing 10 form an outer grease reservoir 24. The bearing outer cover A3 abuts against the bearing outer cover B5 and forms a mechanical labyrinth seal with the outer oil retaining ring 2; The outer bearing cover B5, the outer bearing cover A3, the oil slinger 4, and the outer oil retaining ring 2 form a waste grease storage chamber 25. The inner grease storage chamber 23 and the outer grease storage chamber 24 are connected through the gap of the rotating bearing 10. The lubricant flowing into the outer grease storage chamber 24 is thrown into the waste grease storage chamber 25 through the oil slinger 4.

[0021] The waste grease storage chamber 25 is also provided with an oil drain box 11, which is embedded in the bearing outer cover A3. The oil drain box 11 is located at the bottom of the waste grease storage chamber 25.

[0022] The bearing sealing structure of the mining dump truck generator is also provided with a sealing pressure balancing cavity. The sealing pressure balancing cavity includes: a left axial cavity, a right axial cavity, an inner radial pressure balancing cavity 16, and an outer radial pressure balancing cavity 21. The inner radial pressure balancing cavity 16 and the outer radial pressure balancing cavity 21 are connected through the left axial cavity and the right axial cavity.

[0023] The annular groove in the inner cover 8 facing the inner oil baffle ring 9 forms an inner radial pressure balance cavity 16 with the end face of the inner oil baffle ring 9; the annular groove in the outer cover A3 facing the outer oil baffle ring 2 forms an outer radial pressure balance cavity 21 with the end face of the outer oil baffle ring 2.

[0024] The bearing outer cover A3 is provided with a left oil passage A20 and a right oil passage A13. The bearing outer cover B5 is provided with a left oil hole A19 corresponding to the left oil passage A20 and a right oil hole A22 corresponding to the right oil passage A13. The bearing inner cover 8 is provided with a left oil passage B17 and a right oil passage B15. The mounting holes of the rotor 1 on the housing end cover 6 are respectively provided with connecting oil passages A18 for connecting the left oil passages A20 and B17 and connecting oil passages B14 for connecting the right oil passages A13 and B15.

[0025] The left axial cavity is formed by the interconnection of left oil passage A20, left oil hole A19, connecting oil passage A18, and left oil passage B17. The right axial cavity is formed by the interconnection of right oil passage A13, right oil hole A22, connecting oil passage B14, and right oil passage B15.

[0026] The left oil passage A20 and the right oil passage A13 are connected to the outer radial pressure balance chamber 21, and the left oil passage B17 and the right oil passage B15 are connected to the inner radial pressure balance chamber 16.

[0027] The bearing outer cover A3 is equipped with a pressure balancing device, which includes: two pressure balancing ports 27 on the bearing outer cover A3 that are connected to the left oil passage A20 and the right oil passage A13, a waterproof and dustproof breathable membrane 26 and a louvered protective cover 12 on the pressure balancing ports 27.

[0028] The bearing sealing structure of the mining dump truck generator is also provided with an oil injection channel. The oil injection channel consists of an oil injection hole located at the mounting hole for mounting the rotor 1 on the end cover 6 of the housing and an oil injection hole located on the outer ring of the rotating bearing 10. The oil injection channel is connected to the external pipeline through the oil injection pipe 7.

[0029] The waterproof, dustproof, and breathable membrane 26 is made of E-PTFE. The waterproof, dustproof, and breathable membrane 26 allows the sealed pressure balance cavity to communicate with the external environment, solving the problem of grease loss caused by the pressure difference between the inside and outside of the motor. The sealed pressure balance cavity balances the left and right axial cavities, ensuring even distribution of grease and improving lubrication. The waste grease storage chamber is increased by 25, which completely solves the problem of coexistence of new and waste grease.

[0030] The internal radial pressure balancing chamber 16 achieves physical isolation between the generator interior and the bearing chamber, cutting off the risk of grease flowing into the motor interior, and introduces atmospheric pressure to eliminate the influence of negative pressure inside the motor on the bearing chamber; when a pressure difference is formed between the pressure balancing chamber and the external environment, the pressure balancing device realizes the exchange of internal and external gases, balances the pressure, and prevents grease loss.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bearing sealing structure for a mining dump truck generator, characterized in that, include: The components include a rotor, an end cover, a rotary bearing, an inner bearing cover, an inner oil baffle ring, an oil slinger, an outer bearing cover A, an outer bearing cover B, and an outer oil baffle ring. The end cover is the housing end cover of the generator. The housing end cover has mounting holes for mounting the rotor, and one end of the rotor is mounted in the mounting holes via a rotary bearing. The inner and outer oil baffles are fitted onto the rotor shaft and are located on the inner and outer sides of the rotary bearing. The oil slinger is located on the outer oil baffle. The inner oil baffle, outer oil baffle, and oil slinger rotate with the rotor shaft. The bearing inner cover is located inside the housing end cover and abuts against the inner end face of the outer ring of the rotating bearing. The bearing inner cover and the inner oil baffle ring form a mechanical labyrinth seal, and an inner grease reservoir is formed between the bearing inner cover, the inner oil baffle ring, and the inner end face of the rotating bearing. The bearing outer cover B is located outside the housing end cover and abuts against the outer end face of the outer ring of the rotary bearing. There is a reserved oil slinger gap between the bearing outer cover B, the outer oil baffle ring, the oil slinger, and the outer end face of the rotary bearing to form an outer grease reservoir. Bearing outer cover A rests against bearing outer cover B and forms a mechanical labyrinth seal with the outer oil retaining ring; The outer bearing cover B, the outer bearing cover A, the oil slinger, and the outer oil retainer ring form a waste grease storage cavity. The inner grease storage cavity and the outer grease storage cavity are connected through the gap of the rotating bearing. The lubricant flowing into the outer grease storage cavity is thrown into the waste grease storage cavity through the oil slinger.

2. The bearing sealing structure of a mining dump truck generator according to claim 1, characterized in that, The waste grease storage chamber is also equipped with an oil drain box, which is embedded in the bearing outer cover A, and the oil drain box is located at the bottom of the waste grease storage chamber.

3. The bearing sealing structure of a mining dump truck generator according to claim 1, characterized in that, It also includes a sealed pressure balancing cavity, which comprises: a left axial cavity, a right axial cavity, an inner radial pressure balancing cavity, and an outer radial pressure balancing cavity. The inner radial pressure balancing cavity and the outer radial pressure balancing cavity are connected through the left axial cavity and the right axial cavity.

4. The bearing sealing structure of a mining dump truck generator according to claim 3, characterized in that, The annular groove in the inner cover of the bearing, facing the inner oil baffle ring, forms an inner radial pressure balance cavity with the end face of the inner oil baffle ring; the annular groove in the outer cover A of the bearing, facing the outer oil baffle ring, forms an outer radial pressure balance cavity with the end face of the outer oil baffle ring.

5. The bearing sealing structure of a mining dump truck generator according to claim 4, characterized in that, The bearing outer cover A is provided with a left oil passage A and a right oil passage A. The bearing outer cover B is provided with a left oil hole A corresponding to the left oil passage A and a right oil hole A corresponding to the right oil passage A. The bearing inner cover is provided with a left oil passage B and a right oil passage B. The mounting holes of the rotor on the end cover of the housing are respectively provided with connecting oil passage A for connecting the left oil passage A and the left oil passage B and connecting oil passage B for connecting the right oil passage A and the right oil passage B.

6. The bearing sealing structure of a mining dump truck generator according to claim 4, characterized in that, The left axial cavity is formed by the interconnection of left oil passage A, left oil hole A, connecting oil passage A, and left oil passage B. The right axial cavity is formed by the interconnection of right oil passage A, right oil hole A, connecting oil passage B, and right oil passage B.

7. The bearing sealing structure of a mining dump truck generator according to claim 6, characterized in that, Left oil passage A and right oil passage A are connected to the outer radial pressure balance chamber, and left oil passage B and right oil passage B are connected to the inner radial pressure balance chamber.

8. The bearing sealing structure of a mining dump truck generator according to claim 5, characterized in that, The bearing outer cover A is provided with a pressure balancing device, which includes: two pressure balancing ports on the bearing outer cover A that are connected to the left oil passage A and the right oil passage A, a waterproof, dustproof and breathable membrane and a louvered protective cover provided on the pressure balancing ports.

9. The bearing sealing structure of a mining dump truck generator according to claim 1, characterized in that, It is also provided with an oil injection channel, which consists of an oil injection hole located at the mounting hole on the end cover of the housing for mounting the rotor and an oil injection hole located on the outer ring of the rotating bearing. The oil injection channel is connected to an external pipeline through an oil injection pipe.

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