An eccentric self-locking bearing seal structure

Abstract

The utility model provides a kind of eccentric self-locking bearing sealing structure, including side sealing structure, side sealing structure is annular structure, side sealing structure is set between single raceway outer ring and double raceway inner ring and close to the side surface of bearing;Side sealing structure includes steel framework, the section of steel framework is '' ” type, the outer diameter of steel framework is set eccentric installation lip, eccentric installation lip is contacted with single raceway outer ring, the inner diameter of steel framework is set double-lip sealing lip, double-lip sealing lip is contacted with double raceway inner ring;Through the unique eccentric self-locking design, while omitting sealing baffle, more space is left for rolling body, to realize the unity of high sealing property and high carrying capacity.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology, and in particular to an eccentric self-locking bearing sealing structure. Background Technology

[0002] Bearings used in metallurgy, rolling mills, and mining operate in harsh environments, requiring high levels of dust, slag, and contamination resistance. Therefore, both ends of the bearing must be sealed. However, due to the double-sided sealing structure, compared to conventional bearings, the sealing structure occupies a significant amount of internal space. To prevent interference between the retainer and the sealing structure, the length of the rolling elements must be reduced, thus lowering the load-bearing capacity of the sealed bearing. Traditional sealed bearings require sealing rings to install and fix the side seals, increasing the number of bearing accessories, raising production costs, and negatively impacting bearing precision control. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide an eccentric self-locking bearing sealing structure. Through a unique eccentric self-locking design, the sealing retainer ring is eliminated, while more space is freed up for the rolling elements, thereby achieving a balance between high sealing performance and high load-bearing capacity.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: an eccentric self-locking bearing sealing structure, the bearing including a double-raceway inner ring, rollers, a cage, a double-raceway outer ring, and a single-raceway outer ring, wherein there are two double-raceway inner rings, one double-raceway outer ring, and two single-raceway outer rings, with one double-raceway outer ring disposed between the two single-raceway outer rings; including a side sealing structure, the side sealing structure being annular, the side sealing structure being disposed between the single-raceway outer ring and the double-raceway inner ring and close to the side of the bearing; the side sealing structure including a steel skeleton, the cross-section of the steel skeleton being "U"-shaped, the outer diameter of the steel skeleton being provided with an eccentric mounting lip, the eccentric mounting lip contacting the single-raceway outer ring, and the inner diameter of the steel skeleton being provided with a double-lip sealing lip, the double-lip sealing lip contacting the double-raceway inner ring.

[0005] Furthermore, the inner diameter of the single raceway outer ring is provided with a mounting groove, and an outer ring guide slope is provided between the inner diameter of the single raceway outer ring and the end face. An outer ring mating surface is provided between the mounting groove and the outer ring guide slope. The mounting groove matches the eccentric mounting lip, and the outer ring mating surface contacts the side sealing structure.

[0006] Furthermore, the eccentric mounting lip is provided with a sealing guide slope in the radial direction, and the eccentric mounting lip and the mounting groove are provided with radial clearance fit and axial clearance fit; the side sealing structure is provided with a sealing mating surface on the side near the eccentric mounting lip, and the sealing mating surface is interference fit with the outer ring mating surface.

[0007] Furthermore, the axis of the eccentric mounting lip is not coaxial with the axis of the sealing mating surface.

[0008] Furthermore, the outer diameter of the double raceway inner ring is provided with an inner ring groove, and the double lip sealing lip includes a main lip and a secondary lip. The main lip is interference-fitted with the outer diameter of the double raceway inner ring, and the secondary lip is clearance-fitted with the outer diameter of the double raceway inner ring. A grease-retaining cavity is formed between the main lip, the secondary lip, and the double raceway inner ring.

[0009] Furthermore, it also includes an O-ring seal; the outer diameter of the single raceway outer ring is provided with an outer ring groove, the outer ring groove is located near the end face of the single raceway outer ring, and the outer ring groove matches the O-ring seal.

[0010] Furthermore, an inner diameter sealing assembly is provided between the two double raceway inner rings, and the inner diameter sealing assembly is positioned close to the inner diameter.

[0011] Furthermore, an outer spacer is provided between each of the two single-raceway outer rings and the double-raceway outer rings.

[0012] The axial outer diameter surface of the side sealing structure does not protrude beyond the end face of the bearing.

[0013] Furthermore, the single-race outer ring is integrally formed.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The side sealing component adopts an enclosed structure and does not protrude from the bearing end face. At the same time, the steel frame reduces bending and the structure is more compact.

[0015] 2. It adopts a double-lip sealing design (main lip + secondary lip). The main lip achieves a dynamic contact seal with the inner ring, effectively preventing grease leakage and contaminant intrusion. The secondary lip forms a grease storage cavity with the main lip, which can store grease, continuously lubricate the main lip, and additionally block external moisture and particles, improving sealing durability.

[0016] 3. By generating a large circumferential friction force through the interference fit between the eccentric mounting lip and the bearing outer ring mating surface, reliable circumferential self-locking is achieved, completely eliminating the need for a separate sealing ring. This reduces the number of parts, lowers material costs and assembly complexity, and eliminates the risk of the sealing ring loosening or falling off. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection between the sealing structure and the bearing of this utility model; Figure 2 This is a schematic diagram of the structure of a single raceway outer ring; Figure 3 This is a schematic diagram of the side sealing structure; Figure 4 This is a side view of the side sealing structure; Figure 5 This is a schematic diagram of the structure of this utility model; Figure 6 This is a schematic diagram of an existing sealed bearing. In the diagram: 1. O-ring seal, 2. Single raceway outer ring, 3. Roller, 4. Cage, 5. Inner diameter sealing assembly, 6. Double raceway outer ring, 7. Double raceway inner ring, 8. Side sealing structure, 9. Outer spacer, 10. Sealing retainer ring, 11. Mounting groove, 12. Outer ring mating surface, 13. Outer ring guide slope, 14. Inner ring groove, 15. Steel frame, 16. Eccentric mounting lip, 17. Double lip sealing lip, 18. Main lip, 19. Secondary lip, 20. Sealing guide slope, 21. Sealing mating surface, 22. Outer ring groove. Detailed Implementation

[0018] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0019] See appendix Figure 1-5 An eccentric self-locking bearing sealing structure is disclosed. The bearing includes a double-raceway inner ring 7, rollers 3, a cage 4, a double-raceway outer ring 6, and a single-raceway outer ring 2. There are two double-raceway inner rings 7, one double-raceway outer ring 6, and two single-raceway outer rings 2. A double-raceway outer ring 6 is disposed between the two single-raceway outer rings 2. The bearing includes a side sealing structure 8, which is an annular structure and is disposed between the single-raceway outer ring 2 and the double-raceway inner ring 7, close to the side of the bearing. The side sealing structure 8 includes a steel skeleton 15 with a "U"-shaped cross-section. An eccentric mounting lip 16 is provided on the outer diameter of the steel skeleton 15, which contacts the single-raceway outer ring 2. A double-lip sealing lip 17 is provided on the inner diameter of the steel skeleton 15, which contacts the double-raceway inner ring 7.

[0020] Based on the above technical features, the side seal structure adopts an enclosed structure, that is, the main body of the side seal structure is as close as possible to the bearing end face, and the fixed part and sealing lip shrink inward to reach the effective functional area. Without the side seal structure protruding from the bearing end face, the cage and rolling elements make the most of the space.

[0021] The side seal structure consists of a steel skeleton, an eccentric mounting lip, and a double-lip sealing lip. Compared to traditional sealing assemblies, the steel skeleton reduces one bend, eliminating the need to consider interference with the bend when designing the rolling elements and cage, thus significantly increasing the bearing's load-bearing capacity. After installation, the side seal structure 8 is firmly fixed in the bearing's circumferential (rotation direction) and axial directions, preventing easy rotation or detachment.

[0022] The inner diameter of the single raceway outer ring 2 is provided with a mounting groove 11, and an outer ring guide slope 13 is provided between the inner diameter of the single raceway outer ring 2 and the end face. An outer ring mating surface 12 is provided between the mounting groove 11 and the outer ring guide slope 13. The mounting groove 11 matches the eccentric mounting lip 16, and the outer ring mating surface 12 contacts the side sealing structure 8. Specifically, the outer ring mating surface 12 is interference-fitted with the sealing mating surface 21.

[0023] The eccentric mounting lip 16 is provided with a sealing guide slope 20 in the radial direction. The eccentric mounting lip 16 and the mounting groove 11 are provided with radial clearance fit and axial clearance fit. The side sealing structure 8 is provided with a sealing mating surface 21 on the side near the eccentric mounting lip 16. The sealing mating surface 21 is press-fitted with the outer ring mating surface 12.

[0024] The axis of the eccentric mounting lip 16 is not coaxial with the axis of the sealing mating surface 21.

[0025] Based on the above technical features, the eccentric mounting lip is located at the outer diameter of the side sealing structure. The outer diameter of the eccentric mounting lip is not concentric with the inner diameter of the sealing lip and the outer diameter of the sealing mating surface, exhibiting a certain amount of eccentricity. The mating outer ring does not require a sealing retainer ring; a mating surface and mounting groove are machined at the corresponding inner diameter. Guide slopes are machined on the outer side of the outer ring mating surface and the inner side of the eccentric mounting lip to facilitate seal installation. During installation, the mounting lip on the more protruding side (where the distance between the outer diameter of the eccentric mounting lip 16 and the sealing mating surface 21 is greatest) enters the mounting groove first. The other eccentric mounting lip is pressed into the mounting groove using a press through the outer ring guide slope and mating surface. The mounting groove has axial and radial clearances to prevent the eccentric mounting lip from being squeezed and deformed during installation, making it difficult to insert. There is a certain interference fit between the outer ring and the sealing mating surface, forming a sealing area while preventing relative rotation between the seal and the outer ring.

[0026] The outer diameter of the double raceway inner ring 7 is provided with an inner ring groove 14, which is a relief groove. The double lip sealing lip 17 includes a main lip 18 and a secondary lip 19. The main lip 18 is interference-fitted with the outer diameter of the double raceway inner ring 7, and the secondary lip 19 is clearance-fitted with the outer diameter of the double raceway inner ring 7. A grease-retaining cavity is formed between the main lip 18, the secondary lip 19 and the double raceway inner ring 7.

[0027] The double-lip seal is located at the inner diameter of the side sealing structure. The lip is divided into a main lip and a secondary lip. The main lip contacts the inner ring for sealing and plays the main sealing role. The sealing capacity and the sliding resistance when the bearing rotates are adjusted by changing the interference fit with the inner ring. A grease storage cavity is formed between the secondary lip, the main lip and the inner ring to store a certain amount of grease, which can block external water vapor and contaminant particles.

[0028] It also includes an O-ring seal 1; the outer diameter of the single raceway outer ring 2 is provided with an outer ring groove 22, the outer ring groove 22 is set close to the end face of the single raceway outer ring 2, and the outer ring groove 22 matches the O-ring seal 1.

[0029] An inner diameter sealing assembly 5 is provided between the two double raceway inner rings 7, and the inner diameter sealing assembly 5 is located close to the inner diameter.

[0030] An outer spacer 9 is provided between each of the two single-race outer rings 2 and the double-race outer rings 6.

[0031] The axial outer diameter surface of the side sealing structure 8 does not protrude beyond the end face of the bearing.

[0032] In this embodiment, the single-raceway outer ring 2 is integrally formed. The side sealing structure 8 is installed on the inner diameter of the integrally formed outer ring.

[0033] Reference Appendix Figure 6 To enable the installation function of existing sealed bearings, an additional sealing ring of 10 is required.

[0034] It should be noted that the bearing in this embodiment is only an example, and the eccentric self-locking bearing sealing structure of this utility model can be applied to other types of bearings.

[0035] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", "outer diameter", "inner diameter", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An eccentric self-locking bearing sealing structure, characterized in that: The bearing includes a double-raceway inner ring (7), rollers (3), a cage (4), a double-raceway outer ring (6), and a single-raceway outer ring (2). There are two double-raceway inner rings (7), one double-raceway outer ring (6), and two single-raceway outer rings (2). A double-raceway outer ring (6) is disposed between two single-raceway outer rings (2). It includes a side sealing structure (8), which is an annular structure. The side sealing structure (8) is disposed on the single-raceway outer ring. The side seal structure (8) is located between the outer race (2) and the inner race (7) of the double raceway and close to the side of the bearing; the side seal structure (8) includes a steel skeleton (15), the cross section of the steel skeleton (15) is "U" shaped, the outer diameter of the steel skeleton (15) is provided with an eccentric mounting lip (16), the eccentric mounting lip (16) contacts the outer raceway (2), and the inner diameter of the steel skeleton (15) is provided with a double lip sealing lip (17), the double lip sealing lip (17) contacts the inner raceway (7).

2. The eccentric self-locking bearing sealing structure according to claim 1, characterized in that: The inner diameter of the single raceway outer ring (2) is provided with an installation groove (11), and an outer ring guide slope (13) is provided between the inner diameter and the end face of the single raceway outer ring (2). An outer ring mating surface (12) is provided between the installation groove (11) and the outer ring guide slope (13). The installation groove (11) matches the eccentric installation lip (16), and the outer ring mating surface (12) contacts the side sealing structure (8).

3. The eccentric self-locking bearing sealing structure according to claim 2, characterized in that: The eccentric mounting lip (16) is provided with a sealing guide slope (20) in the radial direction. The eccentric mounting lip (16) and the mounting groove (11) are in radial clearance fit and axial clearance fit. The side sealing structure (8) is provided with a sealing mating surface (21) on the side near the eccentric mounting lip (16). The sealing mating surface (21) and the outer ring mating surface (12) are in interference fit.

4. The eccentric self-locking bearing seal structure according to claim 1, characterized in that: The axis of the eccentric mounting lip (16) is not coaxial with the axis of the sealing mating surface (21).

5. The eccentric self-locking bearing seal structure according to claim 1, characterized in that: The outer diameter of the double raceway inner ring (7) is provided with an inner ring groove (14). The double lip sealing lip (17) includes a main lip (18) and a secondary lip (19). The main lip (18) is interference-fitted with the outer diameter of the double raceway inner ring (7), and the secondary lip (19) is clearance-fitted with the outer diameter of the double raceway inner ring (7). A grease-retaining cavity is formed between the main lip (18), the secondary lip (19), and the double raceway inner ring (7).

6. The eccentric self-locking bearing sealing structure according to claim 1, characterized in that: It also includes an O-ring seal (1); the outer diameter of the single raceway outer ring (2) is provided with an outer ring groove (22), the outer ring groove (22) is provided near the end face of the single raceway outer ring (2), and the outer ring groove (22) matches the O-ring seal (1).

7. The eccentric self-locking bearing seal structure according to claim 1, characterized in that: An inner diameter sealing assembly (5) is provided between the two double raceway inner rings (7), and the inner diameter sealing assembly (5) is located close to the inner diameter.

8. The eccentric self-locking bearing seal structure according to claim 1, characterized in that: An outer spacer (9) is provided between each of the two single-race outer rings (2) and the double-race outer rings (6).

9. The eccentric self-locking bearing sealing structure according to claim 1, characterized in that: The axial outer diameter surface of the side sealing structure (8) does not protrude beyond the end face of the bearing.

10. The eccentric self-locking bearing seal structure according to claim 1, characterized in that: The single raceway outer ring (2) is integrally formed.

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