A bearing chamber structure of an electric wheel traction motor

Abstract

The application discloses an electric wheel traction motor bearing chamber structure, which comprises a driving end bearing chamber sealing structure and a non-driving end bearing chamber sealing structure; the driving end bearing chamber sealing structure comprises a driving end bearing inner cover and a driving end bearing inner tight ring which are connected through a labyrinth mechanical sealing structure a; the driving end bearing inner tight ring is located on one side of a cylindrical roller bearing and is in transition fit with a rotating shaft; and the other side of the cylindrical roller bearing is provided with a driving end bearing outer tight ring; the non-driving end bearing chamber sealing structure comprises a non-driving end cover which integrates a bearing sleeve and a bearing inner cover; the non-driving end cover and a non-driving end bearing inner tight ring are connected through a labyrinth mechanical sealing structure b; and a non-driving end bearing outer tight ring and a non-driving end bearing outer cover form a labyrinth mechanical sealing structure c inside the bearing chamber. The application guarantees the sealing performance of the bearing chamber, effectively prevents the entry of dust and impurities outside the bearing chamber and the loss of internal lubricating grease, and prolongs the lubricating grease replacement cycle of the motor bearing.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of bearing chamber structures, in particular to a bearing chamber structure for a motor matched with a mine electric wheel vehicle. BACKGROUND

[0002] Mining and coal have always been the foundation support of industry, in recent years, the market size of the mine electric wheel vehicle is steadily increasing, and the importance of the mine electric wheel vehicle is self-evident. The electric wheel traction motor as the core equipment of the vehicle has a good development opportunity.

[0003] The mine electric wheel vehicles such as loaders, bulldozers and mine dump trucks have a large amount of dust in the working environment, and the vibration is also large during operation, so the operation environment of the traction motor is poor, and the traction motor is located in the electric wheel, so it is difficult to realize the bearing chamber oil injection and discharge, and therefore higher requirements are put forward for the bearing chamber structure of the electric wheel traction motor.

[0004] The bearing is not only the support of the whole motor, but also an important part for completing the motor transmission. As a component for accommodating the bearing and enabling the bearing to normally work on the motor, the bearing chamber structure is a key part in the overall structure of the motor, and a reasonable bearing chamber structure can improve the operation reliability of the motor bearing and prolong the service life of the motor bearing, so it is necessary to study the bearing chamber structure. SUMMARY

[0005] The purpose of the application is to provide a bearing chamber structure of an electric wheel traction motor, which adopts a reliable bearing, an ultra-large oil storage chamber and a bearing chamber structure with multiple seals to ensure the reliability and safety of bearing lubrication, prolong the service life of the bearing, and has the characteristics of dust prevention, oil leakage prevention and convenient maintenance.

[0006] To achieve the above-mentioned purpose, the application provides a bearing chamber structure of an electric wheel traction motor, which comprises a driving end bearing chamber sealing structure and a non-driving end bearing chamber sealing structure.

[0007] The driving end bearing chamber sealing structure comprises a driving end bearing inner cover fixed on a driving end cover, the driving end bearing inner cover is connected with a driving end bearing inner tight ring in a labyrinth mechanical sealing structure a, the driving end bearing inner tight ring is located on one side of a cylindrical roller bearing and is in transition fit with a rotating shaft, the other side of the cylindrical roller bearing is provided with a driving end bearing outer tight ring, a skeleton oil seal is installed at the connection between the driving end bearing outer tight ring and the inner part of a driving end bearing outer cover, the driving end bearing outer cover is fixedly connected with the driving end bearing inner cover through bolts, and a driving end bearing outer cover oil-resistant gasket is arranged between the two covers.

[0008] The non-drive end bearing chamber sealing structure includes a non-drive end cover that integrates the bearing sleeve and the bearing inner cover into one piece. The non-drive end cover is connected to the non-drive end bearing inner tight ring using a labyrinth mechanical seal structure b. The non-drive end bearing inner tight ring is located on one side of the deep groove ball bearing and transitionally fits with the shaft. The other side of the deep groove ball bearing has a non-drive end bearing outer tight ring. The non-drive end bearing outer tight ring and the non-drive end bearing outer cover form a labyrinth mechanical seal structure c inside the bearing chamber. The non-drive end bearing outer cover is fixedly connected to the non-drive end cover by bolts. An oil-resistant gasket for the non-drive end bearing outer cover is placed between the two covers.

[0009] Furthermore, the inner tight ring of the drive end bearing has a groove near the labyrinth mechanical seal structure a. When it rotates with the shaft, due to centrifugal force, the grease is thrown into the oil cavity of the inner cover of the drive end bearing through the groove.

[0010] Furthermore, the labyrinth mechanical seal structure a is provided with a V-shaped sealing ring I.

[0011] Furthermore, the outer cover of the drive end bearing is provided with a groove for accommodating the sealing felt I, and an opening is made above the groove so that gearbox lubricating oil can be immersed in the groove to lubricate the sealing felt I.

[0012] Furthermore, a sealing felt II is installed near the labyrinth mechanical seal structure b on the inner tight ring of the non-drive end bearing. When the bearing operates at high speed and the temperature rises, the grease is immersed in the sealing felt II.

[0013] Furthermore, the non-drive end bearing cover forms a labyrinth mechanical seal structure d with the speed measuring gear disk outside the bearing chamber.

[0014] Furthermore, the labyrinth mechanical seal structure d is provided with a V-shaped sealing ring II.

[0015] Furthermore, both the cylindrical roller bearings and the deep groove ball bearings are insulated bearings, and the outer surfaces of both bearings are coated with a high-quality film.

[0016] As a further step, the thickness of the inner cover of the drive end bearing is increased to 52-56 mm.

[0017] As a further step, the thickness of the non-drive end cap is increased to 96-98 mm, and the thickness of the non-drive end bearing outer cap is increased to 48-50 mm.

[0018] The advantages of the above technical solutions adopted in this invention compared with the prior art are as follows:

[0019] 1. The bearings at both ends of the motor are insulated bearings with good insulation performance, which can effectively prevent shaft current from passing through, improve the service life of the bearings, and ensure reliable operation of the motor.

[0020] 2. Based on the motor structure, appropriately and reasonably increase the thickness of the inner and outer covers of the bearing to increase the grease storage space, provide sufficient grease for the bearing during long-term operation, ensure lubrication during bearing operation, and extend the bearing life as much as possible.

[0021] 3. The bearing housing adopts a labyrinth mechanical seal structure and multiple sealing elements to ensure the airtightness of the bearing housing, while effectively preventing the entry of external dust and impurities and the loss of internal grease, thus extending the replacement cycle of motor bearing grease. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the axial half-section structure of traditional bearing housing insulation in the prior art;

[0023] Figure 2 This is a schematic diagram of the axial half-section structure of the drive end bearing chamber of the present invention;

[0024] Figure 3 This is a schematic diagram of the axial half-section structure of the non-drive end bearing chamber of the present invention.

[0025] The numbers in the diagram are explained as follows: 1. Insulating bearing sleeve; 2. Insulating gasket; 3. Socket head bolt; 4. Insulating sleeve; 5. End cap; 6. Insulating washer; 7. Outer tight ring of the drive end bearing; 8. Sealing felt I; 9. Outer cover of the drive end bearing; 10. Skeleton oil seal; 11. Oil-resistant washer for the outer cover of the drive end bearing; 12. Drive end end cap; 13. Cylindrical roller bearing; 14. Inner cover of the drive end bearing; 15. V-ring seal I; 16. Inner tight ring of the drive end bearing; 17. Shaft; 18. Inner tight ring of the non-drive end bearing; 19. Sealing felt II; 20. End cap of the non-drive end; 21. Deep groove ball bearing; 22. Oil-resistant washer for the outer cover of the non-drive end bearing; 23. Outer cover of the non-drive end bearing; 24. Speed ​​measuring gear disc; 25. V-ring seal II; 26. Outer tight ring of the non-drive end bearing. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application; that is, the described embodiments are only a part of the embodiments of this application, and not all of them. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1

[0029] Traditional bearing housing insulation structure, such as Figure 1 As shown, an alkali-free cloth is wrapped around the insulating bearing sleeve 1 and an insulating layer with a certain hardness is formed using unsaturated polyester resin and curing adhesive, thus completing the radial insulation between the insulating bearing sleeve 1 and the end cover 5. Then, an insulating washer 6 is fixed between the insulating bearing sleeve 1 and the end cover 5 using an internal hex bolt 3 to achieve axial insulation. To prevent the internal hex bolt 3 from becoming a conductor when connecting the insulating bearing sleeve 1 and the end cover 5, an insulating gasket 2 and an insulating sleeve 4 are placed during the installation of the internal hex bolt 3 to complete the insulation between the internal hex bolt 3 and the end cover 5, thereby achieving the insulation effect between the bearing and the end cover. This structure uses many components and is complex. With motor vibration and long-term high-temperature operation, the insulating material is prone to wear, cracking, and degradation of insulation performance, leading to insulation failure. Furthermore, this structure is complex to repair and replace, with a long maintenance cycle. This invention uses insulating bearings. The motor drive end uses an insulating NU1030 cylindrical roller bearing 13 with high radial load capacity, capable of withstanding heavy and impact loads. The non-drive end of the motor uses an insulating 6226 deep groove ball bearing 21 with a low coefficient of friction. The outer surfaces of both bearings are coated with a high-quality film. The film has strong adhesion to the substrate, excellent insulation properties, effectively cuts off the induced current circuit, avoids damage caused by electro-corrosion, and extends the bearing's service life. Its simple structure and convenient maintenance effectively save maintenance time.

[0030] This invention employs an ultra-large oil reservoir structure, calculated to fully meet the 18,000-hour bearing and grease replacement cycle of the motor. The thickness of the inner cover 14 of the drive-end bearing is significantly increased by utilizing the available space inside the motor, from 42mm to 52-56mm, thus increasing the oil reservoir volume and ensuring sufficient space for grease storage. The thickness of the non-drive-end end cover 20 and the outer cover 23 of the non-drive-end bearing are also appropriately increased, from 88mm to 96-98mm and from 44mm to 48-50mm, respectively. This maximizes the oil reservoir size while maintaining mechanical strength, ensuring the stability and durability of the bearing operation.

[0031] The bearing housing structure of this invention fully considers the safety and reliability of bearing operation, prevents impurities from entering the bearing housing, and prevents oil leakage from the bearing housing during operation. Therefore, the bearing housing is designed with a multi-seal structure, specifically:

[0032] like Figure 2 As shown, the drive-end bearing chamber sealing structure includes a drive-end bearing inner cover 14 fixed to the drive-end end cover 12. The drive-end bearing inner cover 14 and the drive-end bearing inner retaining ring 16 are connected by a labyrinth mechanical seal structure a. The drive-end bearing inner retaining ring is located on one side of the cylindrical roller bearing and transitionally fits with the shaft. A groove is provided near the labyrinth mechanical seal structure a on the drive-end bearing inner retaining ring. When it rotates with the shaft, due to centrifugal force, the grease is thrown into the oil cavity of the drive-end bearing inner cover 14 through the groove, reducing the possibility of grease entering the labyrinth mechanical seal structure a. Even if a small amount of grease enters the sealing structure a, the V-shaped sealing ring I15 effectively prevents the grease from being thrown out of the labyrinth seal structure, while also preventing dust, iron filings, and other impurities inside the motor from entering the bearing chamber and contaminating the grease. The drive-end bearing outer cover 9 is firmly fixed to the drive-end bearing inner cover 14 with bolts to prevent grease from leaking through its mating surface. An oil-resistant gasket 11 for the drive-end bearing outer cover is placed between the two covers. Due to space constraints, a mechanical seal cannot be installed on the outer side of the drive-end bearing. Instead, a skeleton oil seal 10 is installed on the outer ring 7 and outer cover 9 of the drive-end bearing near the cylindrical roller bearing 13. On the other side, a double-layer seal is achieved by installing a sealing felt I8. An opening is made above the groove where the sealing felt I8 is installed on the outer cover 9 of the drive-end bearing, allowing gearbox lubricating oil to penetrate the groove. This lubrication reduces friction and temperature, extending the felt's service life. This multi-layered sealing structure ensures the sealing performance of the drive-end bearing chamber, protects the performance of the lubricating grease, and provides a stable and reliable operating environment for the drive-end bearing.

[0033] like Figure 3As shown, the non-drive end bearing housing sealing structure includes a non-drive end cover 20 that integrates the bearing sleeve and the bearing inner cover into one piece. This reduces the number of parts, makes it easier to process, and saves costs; it also reduces the mating surfaces, lowering the possibility of oil leakage. The non-drive end cover 20 is connected to the non-drive end bearing inner race 18 using a labyrinth mechanical seal structure b. The non-drive end bearing inner race 18 is located on one side of the deep groove ball bearing and transitions to the shaft. A sealing felt II 19 is installed near the sealing structure b on the non-drive end bearing inner race 18. As the bearing temperature rises during high-speed operation, grease is absorbed into the felt, achieving not only a sealing effect but also extending the service life of the felt. The non-drive end bearing outer cover 23 is securely fixed to the non-drive end cover 20 with bolts to prevent grease from leaking through the mating surface. An oil-resistant gasket 22 for the non-drive end bearing outer cover is placed between the two covers. The outer cover 23 of the non-drive end bearing forms a labyrinth mechanical seal structure c with the outer tight ring 26 of the non-drive end bearing inside the bearing chamber, and the outer cover 23 of the non-drive end bearing forms a labyrinth mechanical seal structure d with the speed measuring gear disk 24 outside the bearing chamber. The reliability of the seal is ensured by designing a double labyrinth seal structure. The installation of the V-type seal ring II 25 significantly improves the sealing performance of the bearing chamber. The sealing structure of the non-drive end bearing chamber ensures the stability of the traction motor operation.

[0034] The structure described above not only improves the reliability and safety of the bearing housing, but also facilitates disassembly, reduces maintenance costs, and saves maintenance time.

[0035] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An electric wheel traction motor bearing chamber structure, comprising a driving end bearing chamber sealing structure and a non-driving end bearing chamber sealing structure; characterized in that: the driving end bearing chamber sealing structure comprises a driving end bearing inner cover fixed on a driving end end cover, the driving end bearing inner cover is connected with a driving end bearing inner race through a labyrinth mechanical sealing structure a, the driving end bearing inner race is located on one side of a cylindrical roller bearing and is in transition fit with a rotating shaft, the other side of the cylindrical roller bearing is provided with a driving end bearing outer race, a skeleton oil seal is installed at the connection between the driving end bearing outer race and the inner part of a driving end bearing outer cover, the driving end bearing outer cover is fixedly connected with the driving end bearing inner cover through bolts, and an oil-resistant gasket is placed between the two covers; the non-driving end bearing chamber sealing structure comprises a non-driving end end cover which integrates a bearing sleeve and a bearing inner cover, the non-driving end end cover is connected with a non-driving end bearing inner race through a labyrinth mechanical sealing structure b, the non-driving end bearing inner race is located on one side of a deep groove ball bearing and is in transition fit with the rotating shaft, the other side of the deep groove ball bearing is provided with a non-driving end bearing outer race, the non-driving end bearing outer race and a non-driving end bearing outer cover form a labyrinth mechanical sealing structure c inside the bearing chamber, the non-driving end bearing outer cover is fixedly connected with the non-driving end end cover through bolts, and an oil-resistant gasket is placed between the two covers; a groove accommodating sealing felt I is arranged on the driving end bearing outer cover, and an opening is formed above the groove, and gear box lubricating oil is immersed into the groove to lubricate the sealing felt I; sealing felt II is installed on the non-driving end bearing inner race close to the labyrinth mechanical sealing structure b, and grease is immersed into the sealing felt II due to high temperature rise during high-speed operation of the bearing; the non-driving end bearing outer cover forms a labyrinth mechanical sealing structure d with a speed measuring gear disc outside the bearing chamber; the thickness of the driving end bearing inner cover is increased to 52-56 mm; the thickness of the non-driving end end cover is increased to 96-98 mm, and the thickness of the non-driving end bearing outer cover is increased to 48-50 mm.

2. The electric wheel traction motor bearing chamber structure according to claim 1, characterized in that: a groove is arranged on the driving end bearing inner race close to the labyrinth mechanical sealing structure a, and grease is thrown into the oil cavity of the driving end bearing inner cover through the groove due to centrifugal force during rotation of the rotating shaft.

3. The electric wheel traction motor bearing chamber structure of claim 1, wherein: a V-shaped sealing ring I is arranged in the labyrinth mechanical sealing structure a.

4. The electric wheel traction motor bearing chamber structure of claim 1, wherein: a V-shaped sealing ring II is arranged in the labyrinth mechanical sealing structure d.

5. The electric wheel traction motor bearing chamber structure of claim 1, wherein: The cylindrical roller bearing and the deep groove ball bearing are both insulating bearings, and the outer surfaces of the two bearings are sprayed with high-quality coating.

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