Oil seal structure

Abstract

The invention is suitable for the technical field of oil seal structures, and provides an oil seal structure which comprises a reinforcing framework. The rubber sealing main body is arranged outside the reinforcing framework in a sleeving manner; the main sealing lip and the secondary sealing lip are arranged on the peripheral surface of the rubber sealing main body; a group of spring grooves are formed in the inner circumferential surface, away from the main sealing lip and the secondary sealing lip, of the rubber sealing main body; the spring groove is dug inwards to form an arc-shaped groove; a damping assembly is arranged in the spring groove; the main sealing lip and the secondary sealing lip are matched to form a plurality of sealing defensive lines, so that leakage of a lubricant or a working medium is effectively prevented, and the sealing effect is improved; the damping assembly in the oil seal can absorb and buffer vibration and impact generated by a rotating shaft, and it is ensured that the oil seal keeps excellent stability under the conditions of high-speed rotation and tiny vibration. The V-shaped angles of the main sealing lip and the secondary sealing lip are optimized, so that the sealing effect is further enhanced, excessive compression and abrasion to the shaft are reduced, the sealing integrity is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil seal structures, and in particular relates to an oil seal structure. Background Art

[0002] Oil seals, as a commonly used mechanical sealing component, play a vital role in mechanical transmission systems. They are primarily used on rotating shafts to prevent the leakage of lubricating media and the intrusion of foreign matter and dust into the sealed working area, thereby ensuring the normal operation of the equipment and extending its service life. However, traditional oil seal designs often face a series of challenges in practical applications:

[0003] 1. Poor sealing effect

[0004] Traditional oil seal designs can suffer from poor sealing performance due to improper material selection, unreasonable structure, or inaccurate manufacturing processes. For example, certain oil seal materials may lose their elasticity under high temperature or high pressure environments, preventing them from fitting tightly to the rotating shaft, leading to leakage. Furthermore, the design of the oil seal lip directly affects its sealing performance. Improper lip shape or severe wear can also lead to seal failure.

[0005] 2. Insufficient seismic performance

[0006] In mechanical transmission systems, rotating shafts often generate vibration and shock during operation. Traditional oil seal designs may be easily damaged or fail under the effects of vibration and shock due to the lack of effective shock absorption measures. This not only affects the normal operation of the equipment, but may also cause more serious failures.

[0007] 3. Limited dustproof capability

[0008] The dust-proof ability of oil seals is crucial to keeping the sealed working area clean and dry. However, traditional oil seal designs often have limited dust-proof capabilities and cannot effectively block the intrusion of foreign matter and dust. These foreign matter and dust not only accelerate the wear and aging of the oil seals, but may also damage other parts of the equipment.

[0009] 4. Short service life

[0010] Due to the above problems, traditional oil seal designs often have a short service life; this not only increases the maintenance cost of the equipment, but may also affect the overall performance and reliability of the equipment; especially under harsh working conditions, such as high temperature, high pressure, high speed or corrosive media, the service life of the oil seal is severely challenged. Summary of the Invention

[0011] The present invention provides an oil seal structure, which aims to solve a series of coherent shortcomings faced by traditional oil seal designs in practical applications, mainly including poor sealing effect, insufficient shock resistance, limited dustproof ability and short service life. These shortcomings are interrelated and jointly affect the performance stability and reliability of the oil seal.

[0012] The present invention is achieved as follows: an oil seal structure includes a reinforcement skeleton; a rubber sealing body sleeved on the outside of the reinforcement skeleton; a primary sealing lip and a secondary sealing lip provided on the outer peripheral surface of the rubber sealing body, the primary sealing lip being provided at the front end side position of the rubber sealing body, and the secondary sealing lip being provided at the middle position of the rubber sealing body; a group of spring grooves being provided on the inner peripheral surface of the rubber sealing body away from the primary sealing lip and the secondary sealing lip; the spring grooves being dug inward to form arc-shaped grooves; a shock-absorbing assembly being provided in two of the spring grooves; wherein the shock-absorbing assembly includes: a plurality of return springs provided in the spring grooves, the plurality of return springs being distributed in an array; a damper provided in the plurality of return springs; a same flexible pad being provided on the side of the plurality of return springs away from the positioning groove, the cross section of the flexible pad being a semicircular placement cavity; a self-tightening spring being provided in the placement cavity.

[0013] Preferably, a side of the rubber sealing body adjacent to the spring groove extends upward to form a spring retaining lip, and an upper end surface of the spring retaining lip is provided with a chamfer.

[0014] Preferably, the lip opening of the primary sealing lip and the lip opening of the secondary sealing lip both have a V-shaped cross section with a pointed peak.

[0015] Preferably, a raised dust lip is provided on the outer peripheral surface of the rear end side of the rubber sealing body, and a lip waist portion having an inverted "L"-shaped cross section is formed between the dust lip and the secondary sealing lip.

[0016] Preferably, the outer sealing surface of the rubber sealing body away from the shock absorber assembly has convex and concave patterns.

[0017] Preferably, the V-shaped angle of the peak of the main sealing lip is 60° to 80°.

[0018] Preferably, the V-shaped angle of the secondary sealing lip peak is 100° to 120°.

[0019] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0020] First, the present invention forms multiple sealing lines of defense by designing primary and secondary sealing lips. The primary sealing lip first contacts the rotating shaft and plays a key sealing role, while the secondary sealing lip serves as a backup to ensure that the sealing performance can still be maintained when the primary sealing lip fails. This design not only improves the sealing effect, but also enhances the stability of the oil seal under harsh working conditions, effectively preventing the leakage of lubricant or working medium.

[0021] Second, the shock-absorbing assembly within the oil seal of the present invention works together to absorb and cushion the vibration and impact generated by the rotating shaft during operation. The return spring provides continuous and stable support and rebound force, the damper slows the rate of vibration transmission, and the flexible pad increases the contact area between the oil seal and the rotating shaft, further improving the overall seismic performance. This design enables the oil seal to maintain excellent stability under conditions of high-speed rotation, temperature fluctuations, and slight vibrations.

[0022] Thirdly, the dust lip design of the present invention forms an effective dust barrier that can prevent external pollutants from entering the oil seal area. At the same time, the inverted "L"-shaped lip waist design not only enhances the dustproof effect, but also guides and disperses possible leaked fluids to prevent them from dripping directly outside the oil seal area. This design keeps the oil seal and its surrounding environment clean and dry, extending the service life of the oil seal; optimizing the contact area and enhancing the sealing effect:

[0023] Fourthly, the outer sealing surface of the oil seal of the present invention adopts a convex-concave texture design, which increases the contact area and complexity with adjacent components, thereby enhancing the sealing effect; in addition, the V-shaped angle design of the primary sealing lip and the secondary sealing lip respectively optimizes the contact pressure and contact area with the rotating shaft, so that the oil seal can better adapt to the slight vibration and radial runout of the shaft, while reducing excessive compression and wear on the shaft; this design not only improves the integrity of the seal, but also extends the service life of the oil seal and the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of the present invention;

[0025] Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention;

[0026] Figure 3 It is a front view of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the shock absorbing assembly of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the present invention in use state;

[0029] In the figure: 1. Reinforced skeleton; 2. Rubber seal body; 3. Primary sealing lip; 4. Secondary sealing lip; 5. Spring groove; 6. Return spring; 7. Flexible pad; 8. Self-tightening spring; 9. Spring retaining lip; 10. Dustproof lip; 11. Lip waist; 12. Concave and convex texture. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0031] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] The embodiment of the present invention provides an oil seal structure, such as Figure 1-5 As shown, it includes a reinforcement skeleton 1; a rubber sealing body 2 sleeved on the outside of the reinforcement skeleton 1; a main sealing lip 3 and a secondary sealing lip 4 provided on the outer peripheral surface of the rubber sealing body 2, the main sealing lip 3 is provided at the front end side position of the rubber sealing body 2, and the secondary sealing lip 4 is provided in the middle position of the rubber sealing body 2; a group of spring grooves 5 are provided on the inner peripheral surface of the rubber sealing body 2 away from the main sealing lip 3 and the secondary sealing lip 4; the spring grooves 5 are dug inward to form an arc-shaped groove; a shock-absorbing assembly is provided in the two spring grooves 5; wherein, the shock-absorbing assembly includes: a plurality of return springs 6 provided in the spring grooves 5, and the plurality of return springs 6 are distributed in an array; a damper provided in the plurality of return springs 6; a same flexible pad 7 is provided on the side of the plurality of return springs 6 away from the positioning groove, and the cross section of the flexible pad 7 is a semicircular placement cavity; a self-tightening spring 8 is provided in the placement cavity.

[0033] It should be noted that the traditional oil seal design faces a series of coherent shortcomings in actual application, mainly including poor sealing effect, insufficient shock resistance, limited dustproof ability and short service life. These shortcomings are interrelated and jointly affect the performance stability and reliability of the oil seal. This solution forms multiple sealing lines of defense by designing the primary sealing lip 3 and the secondary sealing lip 4, as well as a shock-absorbing assembly arranged inside the oil seal. The present invention effectively improves the sealing effect, enhances the stability of the oil seal under harsh working conditions, and prevents the leakage of lubricant or working medium; at the same time, the design of the dust lip 10 and the optimization of the inverted "L"-shaped lip waist 11 further block the entry of external contaminants and keep the oil seal and its surrounding environment clean and dry; in addition, the convex and concave texture design 12 on the outer sealing surface of the oil seal and the optimization of the V-shaped angle of the primary and secondary sealing lips 4 not only enhance the sealing effect, but also reduce excessive pressure and wear on the shaft, thereby extending the service life of the oil seal and the rotating shaft.

[0034] Specifically, in this embodiment, the solution mainly includes a reinforcement frame 1; the reinforcement frame 1 provides a stable support structure for the entire oil seal, and the rubber seal body 2 is sleeved on the outside of the reinforcement frame 1, forming the sealing foundation; the primary sealing lip 3 and the secondary sealing lip 4 are designed to be located at the front end side and the middle position of the rubber seal body 2, respectively. This layout helps to form multiple sealing lines of defense and improve the sealing effect; the primary sealing lip 3 usually contacts the rotating shaft first and plays the main sealing role, while the secondary sealing lip 4 serves as a backup seal, and can continue to ensure sealing performance when the primary sealing lip 3 wears or fails;

[0035] The inner circumference of the rubber seal body 2 is provided with a set of spring slots 5. These spring slots 5 are excavated inward to form arc-shaped grooves, providing space for the installation of the shock-absorbing assembly. The shock-absorbing assembly consists of several return springs 6, dampers, and flexible pads 7, which work together to absorb and buffer vibrations. When the rotating shaft vibrates or impacts during operation, the shock-absorbing assembly can effectively absorb this vibration energy and convert it into heat or other forms of energy, thereby protecting the oil seal structure from damage.

[0036] The return springs 6 are arranged in an array within the spring slots 5 and can quickly return to their original shape and position after being squeezed by external forces, thereby providing continuous and stable support and resilience for the oil seal structure. To further enhance the oil seal's anti-seismic performance, dampers are cleverly integrated into the return springs 6. These dampers effectively slow the propagation of vibration and shock, ensuring the oil seal maintains excellent stability even under harsh operating conditions.

[0037] In addition, a flexible pad 7 is provided on the side of the return spring 6 away from the spring groove 5; a placement cavity is provided inside the flexible pad 7, and a self-tightening spring 8 is arranged in the placement cavity; the self-tightening spring 8 enhances and continuously maintains the clamping force of the primary sealing lip 3 and the secondary sealing lip 4 on the rotating shaft. This design is crucial to ensuring the durability and reliability of the sealing effect; at the same time, the soft material used in the flexible pad 7 greatly increases the contact area between the oil seal and the rotating shaft, thereby improving the overall sealing efficiency.

[0038] In a further preferred embodiment of the present invention, Figure 1-3 As shown, the side of the rubber sealing body 2 adjacent to the spring groove 5 extends upward to form a spring retaining lip 9, and the upper end surface of the spring retaining lip 9 is provided with a chamfer.

[0039] In this embodiment, the main function of the spring retaining lip 9 is to firmly accommodate and support the shock-absorbing assembly in the spring groove 5, ensuring that it will not loosen or shift due to vibration or pressure during operation. In order to further optimize the installation and matching process, the upper end surface of the spring retaining lip 9 is carefully processed into a chamfer. The chamfer design reduces the friction resistance during the installation process and ensures a smooth transition between the spring retaining lip 9 and adjacent components, reducing the wear caused by friction, thereby extending the service life of the oil seal.

[0040] In a further preferred embodiment of the present invention, Figure 1-4 As shown, the lip openings of the primary sealing lip 3 and the secondary sealing lip 4 both present a V-shaped cross section with a pointed peak.

[0041] In this embodiment, the "V"-shaped lip is designed to maximize the contact pressure and contact area between the oil seal and the rotating shaft. When the rotating shaft is in operation, the pointed "V"-shaped lip can fit tightly against the surface of the shaft, forming an effective sealing barrier. This ensures that the oil seal can maintain a good sealing effect under conditions of high-speed rotation, temperature changes, and possible slight vibrations of the shaft, thereby preventing leakage of lubricant or working medium.

[0042] In a further preferred embodiment of the present invention, Figure 1-3 As shown, a raised dust lip 10 is provided on the outer peripheral surface of the rear end side of the rubber sealing body 2, and a lip waist 11 with an inverted "L"-shaped cross section is formed between the dust lip 10 and the secondary sealing lip 4.

[0043] In this embodiment, during operation, the dust lip 10 forms an effective dust barrier. When external contaminants attempt to enter the oil seal area, the dust lip 10 will block these contaminants outside by virtue of its elasticity and wear resistance. At the same time, the inverted "L"-shaped lip waist 11 design further enhances this dust-proof effect, ensuring the stability and sealing performance of the dust lip 10 even in the case of high-speed rotation of the shaft or slight vibration. In addition, the inverted "L"-shaped design of the lip waist 11 also helps to guide and disperse possible leaked fluid, preventing it from dripping directly to the outside of the oil seal area, thereby keeping the oil seal and its surrounding environment clean and dry.

[0044] In a further preferred embodiment of the present invention, Figure 1-3 As shown, the outer sealing surface of the rubber sealing body 2 away from the shock absorbing assembly has convex and concave patterns 12 .

[0045] In this embodiment, the convex-concave pattern 12 can increase the contact area between the oil seal and adjacent components, thereby enhancing the sealing effect. By increasing the number and complexity of contact points, this design helps prevent leakage of lubricant or working medium and ensures the integrity of the seal.

[0046] In a further preferred embodiment of the present invention, Figure 1-4 As shown, the V-shaped angle of the peak of the main sealing lip 3 is 60° to 80°.

[0047] In this embodiment, the V-shaped angle of 60° to 80° can ensure close and stable contact between the main sealing lip 3 and the rotating shaft. When the rotating shaft is in operation, this angle design enables the main sealing lip 3 to adapt well to the slight vibration and radial runout of the shaft, thereby maintaining the integrity of the seal.

[0048] In a further preferred embodiment of the present invention, Figure 1-4 As shown, the V-shaped angle of the peak of the secondary sealing lip 4 is 100° to 120°.

[0049] In this embodiment, the V-shaped angle of 100° to 120° provides a more relaxed contact environment for the secondary sealing lip 4. Compared with the primary sealing lip 3, it can better adapt to slight deviations and vibrations of the rotating shaft, thereby reducing excessive pressure and wear on the shaft while maintaining a certain sealing effect. Secondly, this angle design also helps to improve the durability and life of the secondary sealing lip 4. Since the contact area is relatively large and more evenly distributed, the secondary sealing lip 4 can disperse stress when subjected to shaft pressure, avoiding rapid wear or damage caused by excessive local pressure.

[0050] Working Principle: The reinforced skeleton 1 of the present invention serves as the core support structure of the entire oil seal, providing a stable foundation for the oil seal. The rubber seal body 2 is tightly fitted over the reinforced skeleton 1, forming the main body of the seal. The rubber seal body 2 is designed with a primary sealing lip 3 and a secondary sealing lip 4, located at the front end and middle of the rubber seal body 2, respectively. This layout forms multiple sealing lines of defense, significantly improving the sealing effect. The primary sealing lip 3 serves as the first line of defense, first contacting the rotating shaft and playing a key sealing role. The secondary sealing lip 4 serves as a backup. When the primary sealing lip 3 fails due to wear or aging, it can continue to ensure sealing performance, ensuring the continued reliability of the oil seal.

[0051] To further enhance the oil seal's shock resistance, a set of spring slots 5 are provided on the inner circumference of the rubber seal body 2. These slots are recessed into an arcuate groove, providing ample space for the installation of a shock-absorbing assembly. The shock-absorbing assembly comprises a number of return springs 6, a damper, and a flexible pad 7, which work together to effectively absorb and cushion the vibration and impact generated by the rotating shaft during operation, protecting the oil seal structure from damage. The return springs 6 are arranged in an array within the spring slots 5 and can quickly return to their original shape and position after being squeezed by external forces, providing continuous and stable support and resilience for the oil seal. The damper is built into the return springs 6 to further slow the propagation rate of vibration and impact, ensuring that the oil seal maintains excellent stability even under harsh operating conditions.

[0052] Furthermore, the flexible pad 7 is located on the side of the return spring 6 away from the spring slot 5 and contains a self-tightening spring 8. This self-tightening spring 8 strengthens and continuously maintains the pressing force of the primary and secondary sealing lips 3 and 4 against the rotating shaft, ensuring a durable and reliable sealing effect. Furthermore, the soft material of the flexible pad 7 significantly increases the contact area between the oil seal and the rotating shaft, thereby enhancing the overall sealing performance.

[0053] The spring retaining lip 9 firmly accommodates and supports the shock absorber assembly in the spring groove 5, preventing it from loosening or shifting due to vibration or pressure during operation. To optimize the installation and fitting process, the upper end surface of the spring retaining lip 9 is carefully processed into a chamfer, which reduces friction resistance during installation and ensures a smooth transition between the spring retaining lip 9 and adjacent components, reducing wear caused by friction, thereby extending the service life of the oil seal.

[0054] The primary and secondary sealing lips 3 and 4 are designed with pointed "V"-shaped lips. The V-angle of the primary sealing lip 3 is controlled between 60° and 80°, ensuring close and stable contact with the rotating shaft, adapting to slight vibration and radial runout of the shaft and maintaining sealing integrity. The V-angle of the secondary sealing lip 4 is 100° to 120°, providing a more relaxed contact environment, reducing excessive pressure and wear on the shaft, and improving the durability and life of the secondary sealing lip 4.

[0055] The dust lip 10 effectively prevents external contaminants from entering the oil seal area. It fits tightly against the surface of the rotating shaft or adjacent stationary components, forming an effective dust barrier. When external contaminants attempt to enter, the dust lip 10 blocks them out with its elasticity and wear resistance. At the same time, the inverted "L"-shaped lip waist 11 further enhances the dust-proof effect and helps guide and disperse possible leaked fluid, keeping the oil seal and its surrounding environment clean and dry.

[0056] Finally, a convex-concave pattern 12 is provided on the outer sealing surface of the rubber seal body 2 away from the shock absorber assembly; this design not only improves the appearance and texture of the oil seal, but more importantly, increases the contact area and complexity with adjacent components, thereby enhancing the sealing effect, preventing leakage of lubricant or working medium, and ensuring the integrity of the seal.

[0057] It should be noted that for the aforementioned embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, because according to the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0058] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative, such as the division of the above-mentioned units. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the coupling or communication connection between each other shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0059] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also fall within the scope of protection of the present invention.

Claims

1. An oil seal structure, characterized in that: include: Strengthen the skeleton (1); A rubber sealing body (2) sleeved on the outside of the reinforcement frame (1); A primary sealing lip (3) and a secondary sealing lip (4) are provided on the outer peripheral surface of the rubber sealing body (2), wherein the primary sealing lip (3) is provided at the front end side of the rubber sealing body (2), and the secondary sealing lip (4) is provided at the middle portion of the rubber sealing body (2); A group of spring grooves (5) are provided on the inner peripheral surface of the rubber sealing body (2) away from the primary sealing lip (3) and opposite to the secondary sealing lip (4); The spring groove (5) is dug inward to form an arc-shaped groove; a shock-absorbing assembly disposed in the two spring slots (5); Wherein, the shock absorption assembly includes: A plurality of return springs (6) are arranged in the spring slot (5), wherein the plurality of return springs (6) are distributed in an array; a damper disposed within the plurality of return springs (6); A common flexible pad (7) is provided on one side of the plurality of return springs (6) away from the positioning groove, and the cross section of the flexible pad (7) is a semicircular placement cavity; A self-tightening spring (8) is arranged in the placement cavity.

2. An oil seal structure according to claim 1, characterized in that: The rubber sealing body (2) extends upward on one side adjacent to the spring groove (5) to form a spring retaining lip (9), and the upper end surface of the spring retaining lip (9) is provided with a chamfer.

3. The oil seal structure according to claim 1, characterized in that: The lip openings of the primary sealing lip (3) and the secondary sealing lip (4) both present a V-shaped cross section with a pointed peak.

4. An oil seal structure according to claim 3, characterized in that: A raised dustproof lip (10) is provided on the outer peripheral surface of the rear end side of the rubber sealing body (2), and a lip waist (11) having an inverted "L"-shaped cross section is formed between the dustproof lip (10) and the secondary sealing lip (4).

5. An oil seal structure according to claim 4, characterized in that: The outer sealing surface of the rubber sealing body (2) away from the shock-absorbing assembly is provided with convex and concave patterns (12).

6. An oil seal structure according to claim 4, characterized in that: The V-shaped angle of the peak of the main sealing lip (3) is 60° to 80°.

7. The oil seal structure according to claim 4, characterized in that: The V-shaped angle of the peak of the secondary sealing lip (4) is 100° to 120°.

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