Wear-resistant sealing element

Abstract

The utility model discloses a wear-resistant sealing element which comprises a framework and an inner sealing lip attached to the framework, the inner sealing lip comprises a first sealing lip and a second sealing lip which are oppositely arranged in the axial direction of the framework, and the first sealing lip and the second sealing lip both obliquely extend towards the axial outer side of the framework. At least two storage cavities are arranged between the first sealing lip and the second sealing lip, and at least two of the storage cavities are distributed in a step shape. By the adoption of the scheme, the structure of the lubricating grease storage cavity is optimized, the situation that the lubricating grease overflows rapidly when the sealing lip is damaged is relieved, the buffering service time is prolonged, meanwhile, cohesive force is reduced, temperature rising is prevented from being too fast, and the overall service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sealed structure field, concretely relates to a wear -resistant sealing element. BACKGROUND

[0002] The automobile tire central inflation and deflation system is a system that can detect and adjust tire pressure at any time during automobile driving or stopping, when the automobile drives on the relatively complex road surface such as desert, grassland, marsh, sludge, etc., the system can adjust the tire pressure in real time, the driving performance of the automobile on different road surfaces is improved by controlling the air pressure in each tire, so that the different needs of different road surfaces for the air pressure of the wheel tire are met, and the passability of the automobile is greatly improved.

[0003] The applicant found in research that the sealing lip structure of the common oil gas seal is mostly made of polytetrafluoroethylene, the material has basically no elasticity, the interference amount is large when initially installed, so that the holding force of the shaft is large, the friction torque between the sealing lip and the transmission shaft is relatively increased, the starting torque is also increased, the friction torque can be reduced only after a long time of friction, and because the sealing lip needs to be constantly matched with the transmission shaft, the air leakage probability is large in the early stage, and only after wear, the sealing is better when the shaft is closely attached. In addition, due to the structure of the two sealing lips in the same oil gas seal structure, the lubricating grease is difficult to maintain and is consumed constantly, and when the amount of lubricating grease is reduced, the friction torque between the sealing lip and the transmission shaft is also increased, thereby shortening the service life of the sealing structure.

[0004] Therefore, the applicant filed a patent application with the patent number "2024203541342" and the name "inflation and deflation system gas seal", the patent technical solution mainly adopts a sealing lip with a reverse angle, however, the applicant found in continuous research that although this structure can prolong the service life and indeed has good sealing performance, the friction force with the transmission shaft is relatively large, the temperature rises quickly, on the other hand, if the single sealing lip opening is damaged, the internal lubricating grease will quickly overflow, directly causing the gas seal to fail in a short time, and the buffer time is short. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a wear-resistant sealing element to solve the problem of rapid internal temperature rise of the sealing element, quick failure of the inner and outer sealing lips after damage, and indirect influence on the service life.

[0006] The technical scheme is as follows:

[0007] A wear-resistant seal comprises a skeleton and an inner sealing lip attached to the skeleton, the inner sealing lip comprises a first sealing lip and a second sealing lip arranged axially opposite to each other, characterized in that: the first sealing lip and the second sealing lip are both inclinedly extended towards the axial outside of the skeleton, and there are at least two storage cavities between the first sealing lip and the second sealing lip, and at least two of the storage cavities are distributed in a stepped manner.

[0008] The above scheme is adopted, wherein the second sealing lip is the gas side sealing lip, the reverse angle design can keep the lubricating grease for a long time, on the other hand, the multi-cavity grease storage structure can avoid the internal lubricating grease from spilling out quickly and losing the gas sealing function quickly after the first sealing lip or the second sealing lip is damaged, that is, the lubricating grease is further preserved, in addition, the problem of internal temperature rising too quickly caused by the too tight holding of the shaft is also alleviated, which is beneficial to prolong the overall service life.

[0009] As a preferred, there is a supporting lip between the first sealing lip and the second sealing lip, a first storage cavity is formed between the first sealing lip and the supporting lip, and a second storage cavity is formed between the second sealing lip and the supporting lip, and the second storage cavity is located inside the first storage cavity. The above scheme is adopted, the supporting lip can play a certain buffering and sealing effect, and the retention effect of the lubricating grease is improved.

[0010] As a preferred, the skeleton comprises an outer supporting section and an inner supporting section extending radially inwardly along the outer supporting section, wherein the inner supporting section comprises an integrally formed inner first section and an inner second section, wherein the inner first section extends radially inwardly along the outer supporting section, and the inner second section extends towards the side where the second sealing lip is located after being bent. The above scheme is adopted, the outer supporting section and the inner second section both extend towards the gas side, so that there is a larger buffering space even if the end part is slightly deformed, which is beneficial to guarantee the air tightness effect.

[0011] As a preferred, the extension direction of the inner second section is parallel to the outer supporting section.

[0012] As a preferred, the depth of the first storage cavity is located at the relatively radial outside of the inner second section. The above scheme is adopted, even if a larger radial extrusion load is applied, the lubricating grease in the first storage cavity will not be squeezed out, and the retention effect of the lubricating grease can be further improved.

[0013] As a preferred, the inner supporting section has a through hole opened along the axial direction thereof, and the first sealing lip and the second sealing lip are connected in one body through the through hole. The above scheme is adopted, which is convenient for integral vulcanization processing, and at the same time guarantees the overall strength of the sealing lip and the connection strength between the sealing lip and the skeleton, and reduces the probability of extrusion and falling off.

[0014] As preferred: the surface of the second sealing lip opposite to the inner support section comprises an attached section and a fitted section, wherein the attached section is fixed opposite to the inner support section, the fitted section is free opposite to the inner support section, and the fitted section is located radially inside the attached section. With the above scheme, the interference between the second sealing lip and the inflatable shaft is relatively large, and in the present scheme, the fulcrum of the second sealing lip is moved radially outward by reducing the connecting area with the framework, the overall strength of the inner side is reduced, so that it is easier to give way outward when subjected to eccentric extrusion, which is beneficial to reduce the friction torque between the second sealing lip and the inflatable shaft, and improve the eccentric adaptability of the oil and gas seal, and the sealing performance is better.

[0015] As preferred: the demarcation point of the attached section and the fitted section is a fixed point, and the fixed point is located in the range of the inner section and radially inside the through hole. With the above scheme, the second sealing lip has a larger free space, and because the inner section extends radially, it has stronger resistance to radial extrusion.

[0016] As preferred: the second sealing lip is a gas sealing lip and is in interference fit with the inflatable shaft after installation. The sealing member is mainly used for air sealing.

[0017] As preferred: the first sealing lip is an oil sealing lip, and has a ring groove B for installing a spring ring, and is in interference fit with the inflatable shaft after installation. At this time, the sealing member can simultaneously perform air sealing and oil sealing, and prevent oil or lubricating grease from flowing out.

[0018] As preferred: the material of the first sealing lip and the second sealing lip is rubber. With the above scheme, compared with polytetrafluoroethylene, rubber has better elasticity, can reduce the friction torque between the rubber and the inflatable shaft, and has better sealing performance.

[0019] As preferred: the outer support section is attached with an outer sealing lip, the outer sealing lip is attached to the radially outer side of the outer support section, one end of the outer sealing lip extends to the end face of the outer support section, and the other end of the outer sealing lip is integrated with the first sealing lip. With the above scheme, the overall air tightness can be further improved.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] The wear-resistant sealing member provided by the utility model mainly optimizes the structure of the lubricating grease storage cavity, alleviates the condition that the lubricating grease rapidly spills when the sealing lip is damaged, prolongs the buffer use time, reduces the cohesion, prevents rapid temperature rise, and the like, and is beneficial to prolong the overall service life. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view (half side section) of the first embodiment of the utility model;

[0023] Figure 2 It isFigure 1 skeleton cross-sectional view (half cross-section) of the embodiment shown;

[0024] Figure 3 For Figure 1 sealing lip structure schematic diagram (half cross-section) of the embodiment shown;

[0025] Figure 4 It is the second embodiment of the utility model. DETAILED DESCRIPTION

[0026] The utility model will be further explained in detail in connection with the drawings.

[0027] Reference Figures 1 to 4 The wear-resistant sealing piece shown mainly includes a skeleton 1 and an inner sealing lip attached to the skeleton 1, and the inner sealing lip includes a first sealing lip 2 and a second sealing lip 3 arranged opposite along the axial direction of the skeleton 1, and the first sealing lip 2 and the second sealing lip 3 of the application are both inclined to extend towards the axial outer side of the skeleton 1 (in the application, because the actual structure is a ring body, therefore the axial outer side, the axial inner side, the radial inner side and the radial outer side are all referenced to its mounting structure, and the part far away from the inflation hole after installation is the axial outer side, and vice versa, the part close to the inflation shaft in the radial direction is the radial inner side, and the part far away is the radial outer side), and at least two storage cavities 4 are formed between the first sealing lip 2 and the second sealing lip 3, and at least two storage cavities 4 are distributed in a stepped manner.

[0028] Specifically, there is a supporting lip 5 between the first sealing lip 2 and the second sealing lip 3, the supporting lip 5 protrudes radially inward, but the protruding height is less than that of the second sealing lip 3, a first storage cavity 4a is formed between the first sealing lip 2 and the supporting lip 5, a second storage cavity 4b is formed between the second sealing lip 3 and the supporting lip 5, the second storage cavity 4b is located radially inward of the first storage cavity 4a, and the second storage cavity 4b is located axially inward of the first storage cavity 4a.

[0029] The skeleton 1 includes an outer supporting section 10 and an inner supporting section 11 extending radially inward of the outer supporting section 10, wherein the inner supporting section 11 includes an integrally formed inner first section 110 and an inner second section 111, wherein the inner first section 110 extends radially inward of the outer supporting section 10, and the inner second section 111 extends towards the side where the second sealing lip 3 is located after being bent, i.e. extends axially inward, and in specific implementation, the extension direction of the inner second section 111 is parallel to the outer supporting section 10, and the inner first section 110 is perpendicular to the outer supporting section 10 and the inner second section 111.

[0030] As shown in the figure, in the embodiment, the support lip 5 and the second sealing lip 3 are relatively integrated, the relative position is on the axial inner side of the inner second section 111, and the deepest part of the first storage cavity 4a is on the relative radial outer side of the inner second section 111, so that even if the first sealing lip 2 is worn, the lubricating grease in the first storage cavity 4a can still be blocked by the end face of the inner second section 111, and will not quickly overflow.

[0031] In the application, the material of the first sealing lip 2 and the second sealing lip 3 is rubber, the inner support section 11 has a through hole 112 opened along the axial direction thereof, and the first sealing lip 2 and the second sealing lip 3 are connected into one body through the through hole 112.

[0032] The face of the second sealing lip 3 opposite to the inner support section 11 includes an attached section and a fitted section, wherein the attached section is relatively fixed with the inner support section 11, the fitted section is relatively free with the inner support section 11, and the fitted section is located on the radial inner side of the attached section, as shown in the figure. Figure 3 The demarcation point of the attached section and the fitted section (thick line part) is a fixed point A, which is located in the range of the inner first section 110 and on the radial inner side of the through hole 112.

[0033] The outer support section 10 is attached with the outer sealing lip 6, the outer sealing lip 6 is attached to the radial outer side of the outer support section 10, one end thereof extends to the end face of the outer support section 10, and the other end is connected into one body with the first sealing lip 2, the inner and outer sealing lips are in one body, which can effectively ensure the overall strength and reduce the process complexity.

[0034] In addition, the radial outer side of the second sealing lip 3 has a ring groove A30, and a spring ring A is sleeved in the ring groove A30 during installation, and the spring ring A can play a certain elastic fixing role on the second sealing lip 3.

[0035] In the application, the second sealing lip 3 is mainly close to the inflation hole during installation, and is a gas sealing lip, and the spring ring A is in interference fit with the inflation shaft, mainly referring to Figure 1 and Figure 4 The main difference between the second embodiment and the first embodiment of the application is the first sealing lip 2. In the first embodiment, the first sealing lip 2 mainly plays a role in preventing the internal lubricating grease from escaping, so the depth of the inward protrusion thereof close to the support lip 5 can be, and in the second embodiment, the first sealing lip 2 is used as an oil sealing lip, which can seal the external lubricating grease, as shown in the figure, at this time, the depth of the inward protrusion of the first sealing lip 2 is close to that of the second sealing lip 3, and the outer side thereof is provided with a ring groove B20, and a spring ring B can be sleeved in the ring groove B20 during installation, and is also in interference fit with the inflation shaft.

[0036] It should be noted that when the first sealing lip 2 is used as an oil sealing lip, the axial inner side thereof has a protrusion 21, as shown in the figure, the protrusion 21 is located at the radial inner side of the inner second section 111, and the inward protrusion depth thereof is shallower than that of the support lip 5, a cavity 22 is actually formed between the protrusion 21 and the outer edge of the first sealing lip 2, the cavity 22 is separated from the first storage cavity 4a by the protrusion 21, the mutual influence can be reduced, especially the influence of oil and water intrusion can be reduced, and the sealing effect of the air sealing lip can be ensured.

[0037] Reference Figures 1 to 4 It should be noted that the structure described in the present application is a ring-shaped rotary body, and the half-side cross sections shown in the figure are used in the installation, the whole is sleeved on the inflating shaft, generally two groups are used together, the second storage cavity 4b, the first storage cavity 4a and the cavity 22 are all annular cavities, and are filled with sealing medium such as lubricating grease, the second sealing lip 3 is close to the corresponding inflating hole, and is mainly used for the air sealing of the inflating and deflating tire and other inflating and deflating systems, or simultaneously performing air sealing and grease sealing and the like.

[0038] Finally, it should be noted that the above description is only the preferred embodiment of the present application, and the person skilled in the art can make various similar expressions under the inspiration of the present application without violating the purpose and the claims of the present application, and such changes fall within the protection scope of the present application.

Claims

1. A wear resistant seal comprising a carcass (1) and an inner sealing lip attached to the carcass (1), said inner sealing lip comprising a first sealing lip (2) and a second sealing lip (3) arranged axially opposite along the carcass (1), characterized in that: The first sealing lip (2) and the second sealing lip (3) are inclinedly extended towards the axial outer side of the skeleton (1), and at least two storage cavities (4) are arranged between the first sealing lip (2) and the second sealing lip (3), and at least two of the storage cavities (4) are arranged in a stepped manner.

2. The wear-resistant seal of claim 1, wherein: A supporting lip (5) is arranged between the first sealing lip (2) and the second sealing lip (3), a first storage cavity (4a) is formed between the first sealing lip (2) and the supporting lip (5), a second storage cavity (4b) is formed between the second sealing lip (3) and the supporting lip (5), and the second storage cavity (4b) is located radially inward of the first storage cavity (4a).

3. The wear-resistant seal of claim 2, wherein: The skeleton (1) comprises an outer supporting section (10) and an inner supporting section (11) extending radially inward of the outer supporting section (10), wherein the inner supporting section (11) comprises an integrally formed inner first section (110) and an inner second section (111), the inner first section (110) extends radially inward of the outer supporting section (10), and the inner second section (111) extends towards the side where the second sealing lip (3) is located after being bent.

4. The wear-resistant seal of claim 3, wherein: The depth of the first storage cavity (4a) is located radially outward of the inner second section (111).

5. A wear-resistant seal according to claim 3 or 4, characterised in that: The inner supporting section (11) is provided with a through hole (112) extending axially along the inner supporting section (11), and the first sealing lip (2) and the second sealing lip (3) are connected integrally through the through hole (112).

6. A wear-resistant seal according to claim 3 or 4, characterised in that: The surface of the second sealing lip (3) opposite to the inner supporting section (11) comprises an adhering section and a fitting section, the adhering section is fixed opposite to the inner supporting section (11), the fitting section is free opposite to the inner supporting section (11), and the fitting section is located radially inward of the adhering section.

7. The wear-resistant seal of claim 6, wherein: The demarcation point of the adhering section and the fitting section is a fixed point (A), the fixed point (A) is located within the range of the inner first section (110) and radially inward of the through hole (112).

8. The wear-resistant seal of any one of claims 1 to 4, wherein: The second sealing lip (3) is a gas sealing lip, and is installed in interference fit with the inflatable shaft.

9. The wear-resistant seal of claim 8, wherein: The first sealing lip (2) is an oil sealing lip, and is provided with a ring groove B (20) for installing a spring ring, and is installed in interference fit with the inflatable shaft.

10. The wear-resistant seal of claim 3 or 4, wherein: The outer supporting section (10) is attached with an outer sealing lip (6), the outer sealing lip (6) is attached radially outward of the outer supporting section (10), one end of the outer sealing lip (6) extends to the end face of the outer supporting section (10), and the other end of the outer sealing lip (6) is connected integrally with the first sealing lip (2).

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