High-pressure-resistant rotary oil seal

Abstract

The utility model relates to the technical field of oil seals, and discloses a high-pressure-resistant rotary oil seal. The high-pressure-resistant rotary oil seal is arranged on the outer side of a rotary shaft in a sleeving mode, and a rubber body, a framework and a check ring are sequentially arranged from top to bottom in the axial direction of the rotary shaft. The upper surface of the framework is adhered to the lower surface of the rubber body, and the check ring is adhered to the lower surface of the framework; the framework is a plastic ring made of high-temperature-resistant and high-pressure-resistant hard plastic, and the check ring is a metal ring made of high-temperature-resistant and high-pressure-resistant hard metal. According to the high-pressure oil seal, a high-rigidity metal framework is replaced by the plastic framework, the service life of the high-pressure oil seal is greatly prolonged, a sealing piece is prevented from being extruded out of a gap through the cooperation of the plastic framework and the metal check ring, and the pressure bearing capacity of the whole oil seal structure is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil seal technical field especially a kind of high-pressure-resistant rotary oil seal suitable for high-pressure environment under hydraulic motor and other transmission components. BACKGROUND

[0002] Oil seal is mechanical element for sealing oil on transmission components, mainly used to isolate the output components in transmission components and components needing lubrication, to prevent lubricating oil leakage. Oil seal is widely used in hydraulic motors of engineering machinery, construction machinery and the like. Since the working environment pressure of these hydraulic motors is large, the maximum pressure can reach 30MPa, so it is necessary to develop high-pressure-resistant oil seal structure.

[0003] Most of the existing high-pressure oil seals adopt the structure of rubber wrapped outside the metal framework. However, the high rigidity of the metal framework can cause long-time wear of the oil seal lip at the fixed position, resulting in poor sealing effect, short service life, and ultimately causing leakage and damage to the transmission components. Therefore, there is an urgent need for a new high-pressure oil seal structure to improve its durability and pressure-bearing capacity. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a high-pressure-resistant rotary oil seal. The utility model significantly improves the pressure-bearing capacity and service life of the oil seal by using a plastic framework instead of a traditional metal framework and combining the design of a metal retainer ring, solving the problem of easy wear and short service life of the oil seal in a high-pressure environment in the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problem is:

[0006] A high-pressure-resistant rotary oil seal is fitted outside a rotating shaft, and a rubber body, a framework and a retainer ring are sequentially arranged along the axial direction of the rotating shaft from top to bottom. The upper surface of the framework is adhesively arranged with the lower surface of the rubber body, and the retainer ring is arranged on the lower surface of the framework.

[0007] The framework is a plastic ring made of high-temperature and high-pressure resistant hard plastic, and the retainer ring is a metal ring made of high-temperature and high-pressure resistant hard metal.

[0008] The outer side wall of the framework is an outer vertical surface, the inner side wall of the framework includes an inner vertical surface and an inner inclined surface, and the inner vertical surface is arranged above the inner inclined surface. The lower surface of the framework is a lower bottom surface, and the inner inclined surface is arranged at an angle with the lower bottom surface.

[0009] The oil seal is provided with a three-layer structure of a rubber body, a skeleton and a check ring, the upper surface of the skeleton is activated and glued to the lower surface of the rubber body to be chemically cross-linked and bonded, and the structure provides good sealing performance and mechanical strength of the oil seal. The rubber body provides elastic sealing, the skeleton provides support, and the check ring enhances the pressure resistance and stability of the overall structure, and is suitable for high-pressure rotating environment. Specifically, when the oil seal encounters high pressure, the skeleton supports the oil seal structure to reduce excessive deformation of the shape of the oil seal, prevents the oil seal from failing due to high pressure, and the check ring is attached to the lower bottom surface of the skeleton to prevent the skeleton from being extruded. Therefore, the high-pressure-resistant rotating oil seal has strong pressure-bearing performance.

[0010] Further, the rubber body comprises an inner main lip and an outer auxiliary lip arranged inside and outside, the inner main lip is arranged close to the rotating shaft, and the upper surface of the inner main lip is arranged higher than the upper surface of the outer auxiliary lip. When the oil seal works, the inner main lip of the rubber body is close to the rotating shaft and plays a main sealing role. The outer auxiliary lip serves as auxiliary sealing and further prevents leakage. The inner main lip is higher than the outer auxiliary lip, so that the inner main lip preferentially contacts the rotating shaft and improves the sealing effect.

[0011] Further, a U-shaped groove is arranged on the upper surface of the rubber body, and the U-shaped groove separates the inner main lip and the outer auxiliary lip. The design of the U-shaped groove separates the inner main lip and the outer auxiliary lip, avoids mutual interference of the two, and provides better elastic deformation space, thereby enhancing the sealing performance of the oil seal.

[0012] Further, the inner side wall of the inner main lip is a guide slope, the outer side wall of the outer auxiliary lip is an outer slope, and a frosted surface is arranged on the guide slope and close to the skeleton. The design of the guide slope of the inner main lip and the outer slope of the outer auxiliary lip optimizes the contact state of the rubber body and the rotating shaft. The arrangement of the frosted surface increases the friction force, prevents the rubber body from slipping under high pressure, improves the sealing reliability of the oil seal, and further promotes the formation of an oil film to reduce the friction heat with the rotating shaft and enhance the service life of the oil seal.

[0013] Further, the height h of the frosted surface is 2 / 3 of the height H of the guide slope. The height of the frosted surface not only ensures sufficient friction force, but also avoids excessive wear and prolongs the service life of the oil seal.

[0014] Further, an inverted slope structure is arranged at the connection between the upper surface of the outer auxiliary lip and the outer slope. The inverted slope structure at the connection between the upper surface of the outer auxiliary lip and the outer slope reduces stress concentration and prevents the rubber body from cracking or deforming under high pressure.

[0015] Further, the upper surface of the skeleton is matched with the lower surface of the rubber body; the upper surface of the skeleton comprises a first top surface and a second top surface, the first top surface is arranged higher than the second top surface, and a circular arc surface is arranged between the first top surface and the second top surface.

[0016] The arc surface connection can enhance the adhesion of the two materials, further optimizes the cooperation of the skeleton and the rubber body, and improves the stability and sealing performance of the overall structure.

[0017] Further, the included angle between the inner inclined surface and the lower bottom surface is 95-100 degrees, effectively reducing the contact area of the skeleton and the rotating shaft, thereby reducing frictional heat generation and increasing the service life of the oil seal.

[0018] Further, the inner diameter of the retaining ring is consistent with the inner diameter of the lower bottom surface, the outer diameter of the retaining ring is consistent with the outer diameter of the lower bottom surface, and the retaining ring and the lower bottom surface are aligned, which ensures that the retaining ring and the lower bottom surface are tightly combined, thereby enhancing the pressure resistance and stability of the overall structure.

[0019] Further, the first top surface is provided with an inverted bevel structure at the connection with the arc surface. The inverted bevel can prevent burrs from being generated in this part, thereby enhancing the adhesion of the skeleton and the rubber body.

[0020] Further, the included angle between the guide inclined surface and the first top surface is 95-100 degrees, and the included angle between the outer inclined surface and the second top surface is 95-100 degrees, which optimizes the contact angle between the rubber body and the rotating shaft, thereby improving the sealing effect and durability.

[0021] Further, the skeleton is a polytetrafluoroethylene support ring, and the retaining ring is an iron retaining ring. The skeleton adopts a polytetrafluoroethylene support ring, which has excellent self-lubricating, high-temperature-resistant and corrosion-resistant properties; the retaining ring is made of iron material, which provides sufficient mechanical strength and pressure resistance.

[0022] Further, the rubber body, the skeleton and the retaining ring are of an integrated structure, which can significantly improve the overall performance of the oil seal, including the sealing performance, mechanical strength, high-temperature and high-pressure resistance and service life. At the same time, the integrated structure simplifies the manufacturing and assembly process, reduces the production cost and maintenance cost, and is suitable for various harsh working conditions and high-performance requirements. This design not only improves the reliability and safety of the oil seal, but also optimizes the space utilization and economy.

[0023] The utility model discloses the beneficial effect is:

[0024] (1), compared with the oil seal of the prior art with metal skeleton, the utility model discloses a structure is simpler, uses the plastic skeleton to replace the high rigidity metal skeleton, greatly enhances the life of high pressure oil seal, cooperates the use of metal retaining ring, prevents the sealing element from extruding from the gap, enhances the pressure capacity of the whole oil seal structure;

[0025] (2), the sanding surface is arranged on the guide slope, which can promote the formation of oil film to reduce the friction heat with the rotating shaft and enhance the service life of the sealing element;

[0026] (3), the contact surface between the rubber body and the framework adopts a circular arc design, and the larger contact area can enhance the adhesion of the two materials; meanwhile, the first top surface and the connecting position of the circular arc surface are provided with an inverted bevel structure, which can prevent burrs from being generated at the position, thereby enhancing the adhesion of the two materials. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 is a structural schematic diagram of the present application;

[0029] Figure 2 is Figure 1 is a local enlarged view of position A in the figure;

[0030] In the figure: 1. rubber body, 2. framework, 3. retainer ring, 4. inner main lip, 5. outer secondary lip, 6. inner inclined surface, 7. circular arc surface, 8. inner vertical surface, 9. outer vertical surface, 10. first top surface, 11. lower bottom surface, 12. outer inclined surface, 13. U-shaped groove, 14. sanding surface, 15. guide inclined surface, 16. second top surface. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed description is all exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0032] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form also includes the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0033] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the present utility model.

[0034] Embodiment 1

[0035] As shown in Figure 1 and Figure 2 A kind of high-pressure-resistant rotary oil seal, sleeve is set to rotating shaft outside, rubber body 1, framework 2 and metal check ring 3 are sequentially arranged from top to bottom along the rotating shaft axial direction;Framework 2 upper surface and rubber body 1 lower surface are adhesively arranged, check ring 3 is arranged on the lower surface of framework 2;Framework 2 is polytetrafluoroethylene support ring, and check ring 3 is iron check ring.

[0036] Rubber body 1 includes inner and outer inner side main lip 4 and outer side auxiliary lip 5, and the inner side main lip 4 is arranged close to the rotating shaft, and the upper surface of the inner side main lip 4 is arranged higher than the upper surface of the outer side auxiliary lip 5.

[0037] U-shaped groove 13 is formed in the upper surface of rubber body 1, and the U-shaped groove 13 separates the inner side main lip 4 and the outer side auxiliary lip 5.

[0038] The inner side wall of the inner side main lip 4 is a guide slope 15, the outer side wall of the outer side auxiliary lip 5 is an outer side slope 12, the guide slope 15 is provided with an abrasive surface 14, and the abrasive surface 14 is arranged close to the framework 2;The height h of the abrasive surface 14 is 2 / 3 of the height H of the guide slope 15. The setting of the abrasive surface 14 increases the friction, prevents the rubber body 1 from slipping under high pressure, and improves the sealing reliability of the oil seal;In addition, the abrasive surface 14 can also promote the formation of oil film to reduce the friction heat with the rotating shaft, and enhance the service life of the oil seal.

[0039] The upper surface of the framework 2 is arranged in cooperation with the lower surface of the rubber body 1;The upper surface of the framework 2 includes a first top surface 10 and a second top surface 16, the first top surface 10 is arranged higher than the second top surface 16, and the first top surface 10 and the second top surface 16 are connected by a circular arc surface 7;The outer side wall of the framework 2 is an outer vertical surface 9, the inner side wall of the framework 2 includes an inner vertical surface 8 and an inner slope 6, and the inner vertical surface 8 is arranged above the inner slope 6;The lower surface of the framework 2 is a lower bottom surface 11. The first top surface 10 is provided with an inverted bevel structure at the connection with the circular arc surface 7.

[0040] The contact surface between the rubber body 1 and the polytetrafluoroethylene support ring is designed as a circular arc, which can enhance the adhesion of the two materials due to the larger contact area. At the same time, the end of the circular arc adopts an inverted bevel to prevent burrs from being generated in this part, thereby enhancing the adhesion of the two materials.

[0041] The angle between the inner inclined surface 6 and the lower bottom surface 11 is 95-100 degrees, preferably 95, 96, 97, 99 or 100 degrees, which effectively reduces the contact area between the polytetrafluoroethylene support ring and the rotating shaft, thereby reducing the friction heat and increasing the service life of the oil seal.

[0042] The angle between the guide inclined surface 15 and the first top surface 10 is 95-100 degrees, preferably 95, 96, 97, 99 or 100 degrees. The angle between the outer inclined surface 12 and the second top surface 16 is 95-100 degrees, preferably 95, 96, 97, 99 or 100 degrees.

[0043] Example 2

[0044] Based on example 1, the outer side secondary lip 5 upper surface and the outer inclined surface 12 connecting part are provided with an inverted bevel structure. The inverted bevel structure reduces stress concentration and prevents the rubber body 1 from cracking or deforming under high pressure.

[0045] Example 3

[0046] Based on example 1, the inner diameter of the retainer ring 3 is consistent with the inner diameter of the lower bottom surface 11, the outer diameter of the retainer ring 3 is consistent with the outer diameter of the lower bottom surface 11, and the retainer ring 3 and the lower bottom surface 11 are aligned. This structure ensures that the retainer ring 3 and the lower bottom surface 11 are tightly combined, enhancing the pressure resistance and stability of the overall structure.

[0047] In summary, the utility model has the following advantages:

[0048] (1) Compared with the existing oil seal structure with a metal skeleton, the plastic skeleton is used instead of the high-rigidity metal skeleton, greatly enhancing the service life of the high-pressure oil seal, and cooperating with the use of the retainer ring 3 to prevent the sealing element from being extruded from the gap and enhance the pressure-bearing capacity of the entire oil seal structure.

[0049] (2) The guide inclined surface 15 is provided with a frosted surface 14, which can promote the formation of an oil film to reduce the friction heat with the rotating shaft and enhance the service life of the sealing element.

[0050] (3) The contact surface between the rubber body 1 and the skeleton 2 adopts a circular arc design, which can enhance the adhesion of the two materials due to the large contact area. At the same time, the first top surface 10 and the circular arc surface 7 are provided with an inverted bevel structure, which can prevent burrs from being generated in this part, thereby enhancing the adhesion of the two materials.

[0051] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high pressure resistant rotary oil seal, which is fitted to the outside of a rotary shaft, characterized in that: The rubber body (1), the framework (2) and the retaining ring (3) are sequentially arranged along the rotation axis from top to bottom in the axial direction; the upper surface of the framework (2) is adhesively arranged with the lower surface of the rubber body (1), and the retaining ring (3) is arranged on the lower surface of the framework (2); The framework (2) is a plastic ring made of high-temperature and high-pressure hard plastic, and the retaining ring (3) is a metal ring made of high-temperature and high-pressure hard metal. The outer side wall of the framework (2) is an outer vertical surface (9), the inner side wall of the framework (2) comprises an inner vertical surface (8) and an inner inclined surface (6), and the inner vertical surface (8) is arranged above the inner inclined surface (6); the lower surface of the framework (2) is a lower bottom surface (11), and the inner inclined surface (6) is arranged at an angle with the lower bottom surface (11).

2. The high pressure resistant rotary oil seal of claim 1, wherein: The rubber body (1) comprises an inner main lip (4) and an outer auxiliary lip (5) arranged inside and outside, and the inner main lip (4) is arranged close to the rotation axis, and the upper surface of the inner main lip (4) is arranged higher than the upper surface of the outer auxiliary lip (5).

3. The high pressure resistant rotary oil seal of claim 2, wherein: A U-shaped groove (13) is formed in the upper surface of the rubber body (1), and the U-shaped groove (13) separates the inner main lip (4) and the outer auxiliary lip (5).

4. The high pressure resistant rotary oil seal of claim 2, wherein: The inner side wall of the inner main lip (4) is a guide inclined surface (15), the outer side wall of the outer auxiliary lip (5) is an outer inclined surface (12), the guide inclined surface (15) is provided with a frosted surface (14), and the frosted surface (14) is arranged close to the framework (2).

5. The high pressure resistant rotary oil seal of claim 4, wherein: The height h of the frosted surface (14) is 2 / 3 of the height H of the guide inclined surface (15).

6. The high pressure resistant rotary oil seal of claim 4, wherein: An inverted inclined angle structure is arranged at the connection between the upper surface of the outer auxiliary lip (5) and the outer inclined surface (12).

7. The high pressure rotary oil seal of claim 1, wherein: The upper surface of the framework (2) is arranged in cooperation with the lower surface of the rubber body (1); the upper surface of the framework (2) comprises a first top surface (10) and a second top surface (16), the first top surface (10) is arranged higher than the second top surface (16), and a circular arc surface (7) is connected between the first top surface (10) and the second top surface (16).

8. The high pressure rotary oil seal of claim 1, wherein: The included angle between the inner inclined surface (6) and the lower bottom surface (11) is 95°-100°.

9. The high pressure rotary oil seal of claim 1, wherein: The inner diameter of the retaining ring (3) is consistent with the inner diameter of the lower bottom surface (11), the outer diameter of the retaining ring (3) is consistent with the outer diameter of the lower bottom surface (11), and the retaining ring (3) and the lower bottom surface (11) are arranged in alignment.

10. The high pressure resistant rotary oil seal of claim 7, wherein: An inverted inclined angle structure is arranged at the connection between the first top surface (10) and the circular arc surface (7).

11. The high pressure rotary oil seal of claim 1, wherein: The included angle between the guide inclined surface (15) and the first top surface (10) is 95°-100°, and the included angle between the outer inclined surface (12) and the second top surface (16) is 95°-100°.

12. The high pressure rotary oil seal of claim 1, wherein: The framework (2) is a polytetrafluoroethylene support ring, and the retaining ring (3) is an iron retaining ring.

13. The high pressure rotary oil seal of claim 1, wherein: The rubber body (1), the framework (2) and the retaining ring (3) are of an integrated structure.

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