A multi-groove rubber oil seal for shaft sealing
By using a multi-groove rubber oil seal with a multi-stage sealing structure and a media reflux design, the problem of reduced sealing performance and leakage of traditional rubber oil seals under high pressure and high speed is solved, achieving a high-reliability and zero-leakage sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FULIN BAKER SEALS (KUNSHAN) CO LTD
- Filing Date
- 2025-09-28
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional rubber oil seals suffer from decreased sealing performance, rapid lip wear, and easy leakage under high pressure, high speed, or long-term operating conditions. Furthermore, the lack of an effective medium backflow mechanism makes it difficult to avoid minor leaks.
It adopts a multi-groove rubber oil seal design, including a multi-stage sealing structure with a main sealing lip and two secondary sealing lips. Combined with micro-spiral raised texture and oil reservoir, it decomposes the high pressure difference into multiple low pressure difference stages and uses the pump suction effect to achieve medium reflux. With the help of spring, it provides continuous radial clamping force to resist wear.
Significantly improves sealing reliability, extends service life, achieves zero media leakage, and ensures stable long-term sealing performance.
Smart Images
Figure CN224397131U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil seal technology, specifically a multi-groove rubber oil seal for shaft sealing. Background Technology
[0002] Rubber oil seals for shaft sealing are key components used for dynamic sealing of rotating shafts. They mainly consist of a rubber sealing lip and a metal skeleton. Their core function is to form an oil film of about 2.5μm through line contact between the lip and the shaft surface, using the surface tension of the liquid to prevent lubricating oil leakage, while preventing the intrusion of contaminants such as dust and moisture. The rubber material is usually nitrile rubber (NBR) or fluororubber (FKM), which has wear-resistant, oil-resistant and high-temperature resistant properties. Structurally, the outer edge of the oil seal is designed with chamfers or grooves to enhance assembly stability, while the inner lip maintains radial pressure on the shaft through spring compensation to ensure long-term sealing effect. This type of seal is widely used in rotating machinery such as automotive engines and transmissions. The micro-lip design can reduce frictional energy consumption and significantly improve sealing performance and service life.
[0003] Traditional rubber oil seals mostly use single-lip or multi-lip structures, but under high pressure, high speed or long-term operating conditions, they have problems such as decreased sealing performance, rapid lip wear, and easy leakage. In particular, the single sealing lip structure bears the entire pressure difference and is prone to failure due to fatigue, aging or media corrosion, which shortens its service life. In addition, the existing sealing structure lacks an effective media backflow mechanism, and micro-leakage is difficult to avoid, especially during start-up, shutdown or low-speed operation. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a multi-groove rubber oil seal for shaft sealing, which solves the problems mentioned in the background art, such as decreased sealing performance, rapid lip wear, and easy leakage of traditional rubber oil seals under high pressure, high speed, or long-term operating conditions, and the lack of an effective medium backflow mechanism that makes it difficult to avoid minor leakage.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-groove rubber oil seal for shaft sealing, comprising a sealing rubber, wherein a skeleton is fixedly disposed inside the sealing rubber, and atmospheric side surface and sealing medium side surface are respectively disposed on both sides of the sealing rubber. The inner circle of the sealing rubber is provided with a main sealing lip, a first secondary sealing lip, and a second secondary sealing lip. The inner circle of the main sealing lip is provided with a first sliding contact surface, the inner circle of the first secondary sealing lip is provided with a second sliding contact surface, and the inner circle of the second secondary sealing lip is provided with a third sliding contact surface. The second sliding contact surface is provided with micro-spiral raised textures. The interior of the sealing rubber is provided with a first annular groove and a second annular groove. A first spring is fixedly installed inside the first annular groove, and a second spring is fixedly installed inside the second annular groove.
[0006] Preferably, the main sealing lip and the second auxiliary sealing lip are disposed on both sides of the first auxiliary sealing lip, the main sealing lip is disposed on the side of the first auxiliary sealing lip closer to the sealing medium side surface, and the second auxiliary sealing lip is disposed on the side of the first auxiliary sealing lip closer to the atmosphere side surface.
[0007] Preferably, the main sealing lip, the first secondary sealing lip, and the second secondary sealing lip are all integrally formed with the sealing rubber, and the micro-spiral raised texture is integrally formed with the first secondary sealing lip.
[0008] Preferably, an oil storage cavity is provided between the main sealing lip and the first secondary sealing lip.
[0009] Preferably, the diameters of the first sliding contact surface, the second sliding contact surface, and the third sliding contact surface increase slightly in sequence.
[0010] Preferably, the first spring is axially aligned with the main sealing lip, and the second spring is axially aligned with the first secondary sealing lip. Beneficial effects
[0011] This utility model provides a multi-groove rubber oil seal for shaft sealing. It has the following advantages:
[0012] 1. The multi-groove rubber oil seal used for this shaft system seal, through the use of a multi-stage sealing structure of a main sealing lip and two secondary sealing lips, decomposes the high pressure differential into multiple low pressure differential stages, significantly reducing the sealing load of a single lip and improving the overall sealing reliability. Combined with the design of the first sliding contact surface, the second sliding contact surface and the third sliding contact surface having slightly increased diameters in sequence, a stepped throttling and pressure reduction effect is formed, effectively preventing media leakage and extending the service life of the oil seal.
[0013] 2. The multi-groove rubber oil seal used for the shaft system seal has micro-spiral raised textures on the second sliding contact surface of the first sealing lip. When the shaft rotates, it generates a pumping effect, which pumps the trace amount of leaked medium back to the oil storage chamber, achieving zero leakage of the medium. At the same time, the first spring and the second spring are axially aligned and press the main sealing lip and the first sealing lip respectively, providing a continuous radial compensation force, effectively resisting lip wear, and ensuring long-term stable sealing performance. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a second-view structural diagram of the entire utility model;
[0016] Figure 3 This is a side sectional view of the overall structure of this utility model;
[0017] Figure 4 This is a schematic cross-sectional view of the overall structure of this utility model.
[0018] In the diagram: 1. Sealing rubber; 2. Skeleton; 3. Atmospheric side surface; 4. Sealing medium side surface; 5. Main sealing lip; 6. First secondary sealing lip; 7. Second secondary sealing lip; 8. First sliding contact surface; 9. Second sliding contact surface; 10. Third sliding contact surface; 11. Oil reservoir; 12. Micro-spiral raised texture; 13. First annular groove; 14. First spring; 15. Second annular groove; 16. Second spring. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] like Figure 1-4 As shown, this utility model provides a multi-groove rubber oil seal for shaft sealing, including a sealing rubber 1, a skeleton 2 fixedly disposed inside the sealing rubber 1, an atmospheric side surface 3 and a sealing medium side surface 4 respectively disposed on both sides of the sealing rubber 1, a main sealing lip 5, a first secondary sealing lip 6 and a second secondary sealing lip 7 disposed on the inner circle of the sealing rubber 1, a first sliding contact surface 8 disposed on the inner circle of the main sealing lip 5, a second sliding contact surface 9 disposed on the inner circle of the first secondary sealing lip 6, a third sliding contact surface 10 disposed on the inner circle of the second secondary sealing lip 7, and a micro spiral raised texture 12 disposed on the second sliding contact surface 9, a first annular groove 13 and a second annular groove 15 disposed inside the sealing rubber 1, a first spring 14 fixedly installed inside the first annular groove 13, and a second spring 16 fixedly installed inside the second annular groove 15.
[0021] Specifically, the main sealing lip 5 and the second auxiliary sealing lip 7 are located on both sides of the first auxiliary sealing lip 6. The main sealing lip 5 is located on the side of the first auxiliary sealing lip 6 closer to the sealing medium side surface 4, and the second auxiliary sealing lip 7 is located on the side of the first auxiliary sealing lip 6 closer to the atmospheric side surface 3. This arrangement forms a multi-level sealing barrier, gradually reducing the medium side pressure and enhancing the sealing reliability.
[0022] Specifically, the main sealing lip 5, the first secondary sealing lip 6, and the second secondary sealing lip 7 are all integrally formed with the sealing rubber 1, and the micro spiral raised texture 12 is integrally formed with the first secondary sealing lip 6. The integrated structure ensures overall strength and sealing stability, avoiding the leakage risk caused by separate assembly.
[0023] Specifically, an oil storage chamber 11 is provided between the main sealing lip 5 and the first secondary sealing lip 6. The oil storage chamber 11 is used to temporarily store the medium that may leak in small amounts, thereby improving the sealing efficiency.
[0024] Specifically, the diameters of the first sliding contact surface 8, the second sliding contact surface 9, and the third sliding contact surface 10 increase slightly in sequence. This design forms a progressive sealing gap, which effectively throttles and reduces pressure, thereby reducing the load on the main sealing lip 5.
[0025] Specifically, the first spring 14 is axially aligned with the main sealing lip 5, and the second spring 16 is axially aligned with the first auxiliary sealing lip 6. The axial alignment of the springs provides a uniform and continuous radial clamping force, compensating for wear and maintaining the stability of the sealing contact surface.
[0026] The working principle of the above embodiments:
[0027] In the installed state, the inner circle of the sealing rubber 1 forms an interference fit with the surface of the rotating shaft. The innermost main sealing lip 5 has the largest actual interference with the shaft, bearing the main oil pressure and sealing functions. The interference with the shaft of the first secondary sealing lip 6 and the second secondary sealing lip 7 on the outer side decreases sequentially, mainly playing a throttling and pressure-reducing role. This structure decomposes the high pressure differential into multiple low pressure differential stages, significantly reducing the load on individual lips, improving sealing reliability and service life. The oil storage cavity 11 located between the main sealing lip 5 and the first secondary sealing lip 6 is used to store oil accidentally released from the main sealing lip 5. For minor oil leaks, the micro-spiral protrusions 12 on the second sliding contact surface 9 of the first secondary sealing lip 6 generate a pumping effect when the shaft rotates, pumping the medium that has seeped into the contact surface back into the oil reservoir 11, thereby ensuring that the sealing medium does not leak outward and achieving a high-performance sealing effect with zero leakage. In addition, the first spring 14 axially aligns with and presses the main sealing lip 5, and the second spring 16 axially aligns with and presses the first secondary sealing lip 6, respectively providing continuous radial pressing force to compensate for lip wear and ensure long-term stability of sealing performance.
[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A multi-groove rubber oil seal for shaft sealing, comprising sealing rubber (1), characterized in that: The sealing rubber (1) has a skeleton (2) fixedly installed inside. The sealing rubber (1) has an atmospheric side surface (3) and a sealing medium side surface (4) on both sides respectively. The sealing rubber (1) has a main sealing lip (5), a first secondary sealing lip (6) and a second secondary sealing lip (7) on its inner circle. The main sealing lip (5) has a first sliding contact surface (8) on its inner circle. The first secondary sealing lip (6) has a second sliding contact surface (9) on its inner circle. The second secondary sealing lip (7) has a third sliding contact surface (10) on its inner circle. The second sliding contact surface (9) has a micro spiral raised texture (12). The sealing rubber (1) has a first annular groove (13) and a second annular groove (15) inside. The first annular groove (13) has a first spring (14) fixedly installed inside. The second annular groove (15) has a second spring (16) fixedly installed inside.
2. The multi-groove rubber oil seal for shaft sealing according to claim 1, characterized in that: The main sealing lip (5) and the second auxiliary sealing lip (7) are located on both sides of the first auxiliary sealing lip (6). The main sealing lip (5) is located on the side of the first auxiliary sealing lip (6) near the sealing medium side surface (4), and the second auxiliary sealing lip (7) is located on the side of the first auxiliary sealing lip (6) near the atmosphere side surface (3).
3. The multi-groove rubber oil seal for shaft sealing according to claim 1, characterized in that: The main sealing lip (5), the first secondary sealing lip (6) and the second secondary sealing lip (7) are all integrally formed with the sealing rubber (1), and the micro spiral raised texture (12) is integrally formed with the first secondary sealing lip (6).
4. A multi-groove rubber oil seal for shaft sealing according to claim 1, characterized in that: An oil storage cavity (11) is provided between the main sealing lip (5) and the first secondary sealing lip (6).
5. A multi-groove rubber oil seal for shaft sealing according to claim 1, characterized in that: The diameters of the first sliding contact surface (8), the second sliding contact surface (9), and the third sliding contact surface (10) increase slightly in sequence.
6. A multi-groove rubber oil seal for shaft sealing according to claim 1, characterized in that: The first spring (14) is axially aligned with the main sealing lip (5), and the second spring (16) is axially aligned with the first auxiliary sealing lip (6).