Anti-movement oil seal sealing structure

Abstract

The anti-moving oil seal sealing structure comprises an oil seal seat, a bearing and a transmission shaft, the bearing is rotatably installed on the outer side of the transmission shaft, the oil seal seat is rotatably connected with the outer side of the transmission shaft through the bearing, a lubricating oil cavity is fixedly formed in the oil seal seat, and an oil seal structure is arranged on the inner side of the lubricating oil cavity. According to the anti-displacement oil seal sealing structure, the flexible mechanism assembling part is connected with the shell, the middle part is made of flexible rubber, the axial displacement rubber is stretched and compressed, the displacement phenomenon of the oil seal lip is transferred to the flexible part, the effect of offsetting displacement is achieved, displacement of the oil seal lip during sealing is prevented, sealing is guaranteed, and the service life of the oil seal is prolonged. The oil seal is simple in structure and convenient to use, the displacement of the oil seal lip is effectively transferred to a non-key part, stability of an oil film is guaranteed, meanwhile, the multiple dustproof lips are matched with the stainless steel protective cover, the self-sealing effect is achieved, impact abrasion of external silt impurities to the oil seal lip is effectively prevented, the service life of the oil seal is prolonged, and after-sale use and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to an anti-movement oil seal structure. Background Art

[0002] The drive shaft of a commercial vehicle driven by the front axle has axial movement in the cooperation between the drive shaft and the oil seal. The oil seal is immersed in lubricating oil. During operation, the radial rotation of the drive shaft is accompanied by axial movement. This movement causes friction loss on the oil seal lip, and the temperature of the lubricating oil increases, which may cause the air pressure in the oil chamber to increase. In this case, the lubricating oil leaks out of the oil chamber through the oil seal, resulting in poor bearing lubrication and even ablation.

[0003] For example, an oil seal sealing structure with the authorization announcement number CN219176946U has a Y-shaped first oil seal ring and a second oil seal ring to achieve a sealing effect, reduce the number of times the seal ring is replaced, ensure production results, and save economic and time costs.

[0004] However, there are still some problems when using the above-mentioned oil seal sealing structure. For example, the above-mentioned oil seal sealing structure generally adopts an oil seal structure without a softening mechanism in the existing commercial vehicle front drive axle sealing form to seal external mud and water and bearing side lubricating oil. The existing sealing structure usually uses a single seal, including 1 oil seal lip and 1 auxiliary lip. The main lip with a spring mainly plays the role of sealing the lubricating oil in the oil chamber, and the auxiliary lip is arranged on the air side. The oil seal in the existing technology can play the role of dust and oil sealing under certain conditions, but when the shaft moves, the sealing reliability is not high. At the same time, the ability of this structure to prevent external mud and sand is weak. In a short time, mud and sand enter the oil seal lip, the lip wears, and the seal fails. During the driving of the vehicle, mud, dust, sewage and other media splash onto the oil seal surface, and the mud and sand directly act between the oil seal auxiliary lip and the drive shaft, causing the auxiliary lip to wear quickly. The mud and sand creep into the inside of the oil seal main lip with the axial movement of the drive shaft, causing the main lip to wear and leak oil. Summary of the Invention

[0005] The utility model aims to solve the problems existing in the above-mentioned prior art and provide an anti-movement oil seal sealing structure, which can effectively prevent mud and sand from entering the inner lip of the oil seal, offset the influence of movement on the oil seal lip, so that the oil seal lip always maintains a fixed sealing position, ensures sealing reliability, extends the service life of the oil seal, and reduces after-sales use and maintenance costs.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] An anti-movement oil seal sealing structure is designed, which includes an oil seal seat, a bearing and a transmission shaft. The bearing is rotatably installed on the outside of the transmission shaft, and the oil seal seat is rotatably connected to the outside of the transmission shaft through the bearing. A lubricating oil chamber is fixedly opened inside the oil seal seat, and an oil seal structure is provided on the inside of the lubricating oil chamber.

[0008] Further improvement, the oil seal structure includes a bearing retainer, an assembly part and a protective cover, the bearing retainer is fixedly installed on the inner side of the oil seal structure, a fixed bearing is rotatably installed on the inner side of the bearing retainer, the assembly part is fixedly connected to the inner side of the oil seal structure, and a flexible mechanism is fixedly sleeved on the outer side of the assembly part.

[0009] For further improvement, the protective cover is fixedly arranged at one end of the inner side of the oil seal structure, the inner side of the protective cover is rotatably connected to a secondary lip, one side of the secondary lip is fixedly connected to an oil sealing lip, the other side of the secondary lip is fixedly connected to multiple dust sealing lips, and the lower end of the flexible mechanism is also fixedly connected to a dust sealing lip.

[0010] Further improvement, there is mud and sand at the end opening of the oil seal seat, and the front end of the mud and sand is arranged opposite to the outer side of the dust sealing lip.

[0011] Further improvement, the end of the lubricating oil chamber is sealed by an oil seal structure and mud and sand, and the inner side of the lubricating oil chamber is rotatably connected to the side wall of the bearing.

[0012] The beneficial effects of the utility model are as follows: the utility model is connected to the housing through a flexible mechanism assembly part, the bearing retainer is connected to the bearing, and the middle part adopts flexible rubber. The shaft movement rubber is stretched and compressed, and the movement phenomenon that should be in the oil sealing lip is transferred to this flexible part, which plays a role in offsetting the movement, preventing the oil sealing lip from shifting during sealing, ensuring sealing, and effectively transferring the movement of the oil sealing lip to non-critical parts, ensuring the stability of the oil film. At the same time, multiple dustproof lips are used in conjunction with the stainless steel protective cover to play a self-sealing role, effectively blocking the impact and wear of external mud and sand impurities on the oil sealing lip, extending the service life of the oil seal, and reducing after-sales use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic cross-sectional view of the overall assembly structure of the utility model;

[0014] Figure 2 for Figure 1 A magnified schematic diagram of the oil seal structure;

[0015] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0016] Figure 4 for Figure 1 Enlarged schematic diagram of part B.

[0017] Explanation of the accompanying drawings: In the figure: 1. Oil seal seat, 2. Bearing, 3. Drive shaft, 4. Lubricating oil chamber, 5. Oil seal structure, 6. Mud and sand, 7. Fixed bearing, 8. Bearing retainer, 9. Flexible mechanism, 10. Assembly part, 11. Dust sealing lip, 12. Protective cover, 13. Auxiliary lip, 14. Oil sealing lip. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Example 1:

[0020] Refer to the attached Figure 1-4 : In this embodiment, an anti-movement oil seal sealing structure includes an oil seal seat 1, a bearing 2 and a transmission shaft 3. The bearing 2 is rotatably installed on the outside of the transmission shaft 3. The oil seal seat 1 is rotatably connected to the outside of the transmission shaft 3 through the bearing 2. A lubricating oil chamber 4 is fixedly opened inside the oil seal seat 1, and an oil seal structure 5 is provided on the inner side of the lubricating oil chamber 4.

[0021] The oil seal structure 5 includes a bearing retainer 8, an assembly portion 10 and a protective cover 12. The bearing retainer 8 is fixedly mounted on the inner side of the oil seal structure 5. A fixed bearing 7 is rotatably mounted on the inner side of the bearing retainer 8. The fixed bearing 7 is supported and limited by the bearing retainer 8 to connect the transmission shaft 3, the oil seal structure 5 and the flexible mechanism 9, and assists in rotation when the inner and outer oil seals are working. The assembly portion 10 is fixedly connected to the inner side of the oil seal structure 5. The outer side of the assembly portion 10 is fixedly sleeved with a flexible mechanism 9. The flexible mechanism 9 is connected to the housing at the assembly portion 10. The bearing retainer 8 is connected to the fixed bearing 7. The middle part uses flexible rubber to offset the movement when the shaft moves.

[0022] The protective cover 12 is fixedly arranged at one end of the inner side of the oil seal structure 5. The protective cover 12 is made of stainless steel. The protective cover 12 cooperates with the auxiliary lip 13 to prevent external mud and sand 6 from entering the oil seal lip, and at the same time cooperates with the main lip to play a self-sealing role. The inner side of the protective cover 12 is rotatably connected to the auxiliary lip 13, and one side of the auxiliary lip 13 is fixedly connected to an oil sealing lip 14. The oil sealing lip 14 is provided with a pre-tightening spring, which cooperates with the stainless steel protective cover 12 to prevent leakage of the lubricating fluid inside the lubricating oil chamber 4. The other side of the auxiliary lip 13 is fixedly connected to a plurality of dust sealing lips 11. The dust sealing lips 11 cooperate with the stainless steel protective cover 12 to prevent external mud and sand 6 from entering the oil sealing lip 14 in the oil seal structure 5, protect the oil sealing lip, and extend its service life. The lower end of the flexible mechanism 9 is also fixedly connected to the dust sealing lip 11.

[0023] There is mud and sand 6 at the end opening of the oil seal seat 1. The front end of the mud and sand 6 is arranged opposite to the outer side of the dust sealing lip 11. The end of the lubricating oil chamber 4 is sealed by the oil seal structure 5 and the mud and sand 6. The inner side of the lubricating oil chamber 4 is rotatably connected to the side wall of the bearing 2.

[0024] Working principle:

[0025] The anti-drifting oil seal is suitable for commercial front drive axles that experience axial drift when the wheels turn. Compared to the traditional single-body seal structure, the newly invented anti-drifting oil seal system is a cassette-type self-sealing structure with excellent dust and sand prevention performance. Unlike the traditional single-body seal, it also adopts a flexible mechanism design to transfer the movement of the oil seal lip and maintain the stability of the oil film. The oil seal system is connected by bearings, which has lower rotational torque than traditional seals.

[0026] First, the new sealing system consists of a flexible mechanism 9, a stainless steel protective cover 12, an oil seal structure 5, and a fixed bearing 7. The oil seal 5 is mounted on the fixed bearing 7. The flexible mechanism 9 is connected to the oil seal 5 and rotates with the housing. The fixed bearing 7 and the stainless steel protective cover 12 are mounted on the transmission shaft 3 and rotate with the transmission shaft 3. The oil seal 5 and the stainless steel protective cover 12 rotate relative to each other, and a seal is formed by the interference fit of the lip.

[0027] Then the oil seal body 5 is provided with four sealing lips. After being combined with the stainless steel protective cover 12, the side lips and auxiliary lips 13 of the oil seal 5 isolate the external muddy water and sand 6 from the outside when the protective cover 12 rotates, so that impurities cannot enter the oil sealing lip 14. The oil sealing lip 14 is covered with a spring and has an interference fit with the protective cover 12. They rotate with each other to seal the lubricating fluid.

[0028] Then the assembly part 10 of the flexible mechanism 9 is connected to the housing, and the bearing retainer 8 is connected to the bearing 3. The middle part is made of flexible rubber. When the shaft moves, the rubber is stretched and compressed, and the movement that should be at the oil seal lip is transferred to this flexible part, which plays a role in offsetting the movement and preventing the oil seal lip 14 from shifting during sealing, thereby ensuring the seal;

[0029] 4 Finally, the fixed bearing 7 can provide a small rotational torque while connecting the internal and external components, and at the same time allow the lubricating oil to have good permeability to ensure the lubrication of the oil sealing lip;

[0030] The fixed bearing 7 is supported and limited by the bearing retainer 8, which can connect the transmission shaft 3, the oil seal structure 5 and the flexible mechanism 9, and assist the rotation of the inner and outer oil seals when they are working. The flexible mechanism 9 is connected to the housing at the assembly part 10, and the bearing retainer 8 is connected to the fixed bearing 7. The middle part is made of flexible rubber, which plays a role in offsetting the movement of the shaft.

[0031] Then the protective cover 12 is made of stainless steel. The protective cover 12 cooperates with the auxiliary lip 13 to prevent external mud and sand 6 from entering the oil seal lip, and cooperates with the main lip to play a self-sealing role. The oil seal lip 14 is provided with a pre-tightened spring, which cooperates with the stainless steel protective cover 12 to prevent the lubricating fluid inside the lubricating oil chamber 4 from leaking. The dust sealing lip 11 and the stainless steel protective cover 12 cooperate to prevent external mud and sand 6 from entering the oil seal lip 14 in the oil seal structure 5, thereby protecting the oil seal lip and extending its service life.

[0032] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. An anti-movement oil seal sealing structure, comprising an oil seal seat (1), a bearing (2) and a transmission shaft (3), wherein the bearing (2) is rotatably mounted on the outer side of the transmission shaft (3), and the oil seal seat (1) is rotatably connected to the outer side of the transmission shaft (3) through the bearing (2), and is characterized by: A lubricating oil cavity (4) is fixedly provided inside the oil seal seat (1), and an oil seal structure (5) is provided inside the lubricating oil cavity (4).

2. The anti-movement oil seal structure according to claim 1, characterized in that: The oil seal structure (5) comprises a bearing retainer (8), an assembly portion (10) and a protective cover (12); the bearing retainer (8) is fixedly mounted on the inner side of the oil seal structure (5); a fixed bearing (7) is rotatably mounted on the inner side of the bearing retainer (8); the assembly portion (10) is fixedly connected to the inner side of the oil seal structure (5); and a flexible mechanism (9) is fixedly sleeved on the outer side of the assembly portion (10).

3. The anti-movement oil seal structure according to claim 2, characterized in that: The protective cover (12) is fixedly arranged at one end of the inner side of the oil seal structure (5); the inner side of the protective cover (12) is rotatably connected to an auxiliary lip (13); one side of the auxiliary lip (13) is fixedly connected to an oil sealing lip (14); the other side of the auxiliary lip (13) is fixedly connected to a plurality of dust sealing lips (11); and the lower end of the flexible mechanism (9) is also fixedly connected to the dust sealing lip (11).

4. The anti-movement oil seal structure according to claim 1, characterized in that: There is mud and sand (6) at the end opening of the oil seal seat (1), and the front end of the mud and sand (6) is arranged opposite to the outer side of the dust sealing lip (11).

5. The anti-movement oil seal structure according to claim 1, characterized in that: The end of the lubricating oil chamber (4) is sealed by an oil seal structure (5) and mud and sand (6), and the inner side of the lubricating oil chamber (4) is rotatably connected to the side wall of the bearing (2).

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