Oil seal for automobile hub

Abstract

The utility model relates to the technical field of sealing elements, in particular to an oil seal for an automobile hub, which comprises a limiting framework, a spring, an outer oil seal for being assembled with an axle housing and a shaft sleeve for being assembled with a shaft, the outer oil seal comprises an outer framework, the outward side of the outer framework is wrapped with a first rubber part, the outer framework is provided with a plurality of groups of bending parts, and the first rubber part is arranged on the outer framework. The shaft sleeve comprises an inner framework, the outward side of the inner framework is wrapped with a second rubber part, one end of the limiting framework is connected with the inner framework, the other end of the limiting framework is bent downwards to form an assembly space, one end of the outer framework is located in the assembly space, and the other end of the outer framework is located above the top wall of the inner framework. The first rubber part located in the assembling space is provided with a main lip in a protruding mode along the inner side wall of the inner framework, the spring is arranged on the main lip in a sleeving mode and used for limiting the shaft sleeve in the radial direction, the retentivity of the oil seal structure is improved, it is ensured that sealing between the oil seal and the hub axle housing and sealing between the oil seal and the shaft are tight, and muddy water is effectively prevented from entering the axle housing.

Description

Technical Field

[0001] The utility model relates to the technical field of seals, in particular to an oil seal for an automobile wheel hub. Background Art

[0002] The automobile wheel hub oil seal is an important sealing component installed between the automobile wheel hub and the axle, and is used to seal the installation space formed between the wheel hub and the axle. The wheel hub is installed on the axle head of the axle through a bearing, and the oil seal is located at a key position in this installation space to ensure the sealing effect, preventing the leakage of axle head lubricating oil and preventing pollutants from entering the interior of the wheel hub assembly;

[0003] With the rapid economic development of cities across the country, the urbanization process has been accelerating continuously, urban construction has been changing with each passing day, high-rise buildings have sprung up, and the road network has become increasingly perfect. As an indispensable means of transportation in modern life, the popularity and usage frequency of automobiles have also increased sharply. However, behind this prosperous scene, more stringent requirements have been put forward for automobile transportation and its supporting facilities. Especially for heavy engineering vehicles such as dump trucks and cement mixer trucks, when frequently shuttling between cities and construction sites, in order to ensure the cleanliness and safety of urban roads, these engineering vehicles must perform a tire cleaning procedure before leaving the construction site and driving onto public roads to remove the mud attached to the tires and wheel hubs. Therefore, as a key component to prevent mud and water from invading, the performance and reliability of the automobile wheel hub oil seal are particularly important;

[0004] The design of the existing automobile wheel hub oil seal mainly relies on the interference fit between the outer diameter of the oil seal and the aperture of the wheel hub bridge shell, and the close contact between the sealing lip of the oil seal and the shaft to achieve the sealing effect. However, when facing harsh working conditions, especially the erosion of mud and water mixtures, relying solely on the interference fit between a single sealing lip and the shaft, as the service life increases, the aging of the oil seal colloid makes it difficult to maintain the structure of the oil seal colloid, increasing the fit gap between the oil seal and the wheel hub bridge shell and the shaft, making it difficult to effectively block the penetration of mud and water, and difficult to maintain the sealing effect, resulting in mud and water easily entering the interior of the bridge shell, and then triggering a series of problems such as bearing rust, gear oil pollution, and decline in lubrication performance, ultimately accelerating the wear and damage of parts. Summary of the Utility Model

[0005] In order to improve the performance of the automobile wheel hub oil seal in preventing mud and water, and improve the sealing effect and service life of the oil seal, the present application provides an oil seal for an automobile wheel hub.

[0006] An oil seal for an automobile wheel hub provided by the utility model adopts the following technical scheme:

[0007] An oil seal for an automobile wheel hub comprises a limiting skeleton, a spring, an outer oil seal for assembly with a bridge housing, and a shaft sleeve for assembly with a shaft, wherein the outer oil seal comprises an outer skeleton, a first rubber member is wrapped on the outward side of the outer skeleton, and the outer skeleton is provided with a plurality of groups of bending portions, and the shaft sleeve comprises an inner skeleton, a second rubber member is wrapped on the outward side of the inner skeleton, one end of the limiting skeleton is connected to the inner skeleton, and the other end of the limiting skeleton is bent downward to form an assembly space, one end of the outer skeleton is located in the assembly space, and the other end of the outer skeleton is located obliquely above the top wall of the inner skeleton, and the first rubber member located in the assembly space is provided with a main lip along the inner side wall protrusion of the inner skeleton, and the spring is sleeved on the main lip for radially limiting the shaft sleeve.

[0008] Preferably, the outer frame is provided with two groups of bending parts, and the two groups of bending parts are staggered up and down, and the two groups of bending parts are respectively an upper bending part and a lower bending part, and the lower bending part is located below the upper bending part and is close to the limiting frame.

[0009] Preferably, the inner frame extends toward the outer frame so that the inner frame is arranged in an L-shape, and the bottom wall of the inner frame is raised toward the bottom wall of the outer frame to form a supporting portion.

[0010] Preferably, the first rubber member is further provided with a first mud-proof lip, the first mud-proof lip is located in the assembly space, and the first mud-proof lip is protruded from the bottom of the first rubber member toward the bottom wall of the inner frame.

[0011] Preferably, the first rubber member is further provided with a second anti-mud lip, the second anti-mud lip is located below the main lip, and the second anti-mud lip is protruded from the bottom of the main lip toward the bottom wall of the inner frame.

[0012] Preferably, the springs are provided in two groups, one group of the springs is sleeved on the side wall of the main lip, and the other group of the springs is sleeved on the side wall of the second anti-mud lip.

[0013] Preferably, the first rubber member is further provided with an extension portion, the extension portion is provided to protrude downward from below the lower bending portion, and the extension portion is located on the outward side of the support portion.

[0014] Preferably, the limiting frame is provided with a plurality of through holes, and the through holes are arranged through the limiting frame from the top wall of the limiting frame toward the main lip.

[0015] Preferably, the side wall of the second rubber member in contact with the shaft has a raised inner convex ring and an inner convex strip, the inner convex ring is annularly arranged on the second rubber member, and the inner convex strip is perpendicular to and intersecting with the inner convex ring and is arranged on the second rubber member.

[0016] Preferably, a plurality of annular grooves are formed in the outer wall of the first rubber part, and the first rubber part is provided with a guiding part which is located above the annular grooves and is gradually inclined towards the top wall of the first rubber part.

[0017] The beneficial effects of the present utility model are as follows:

[0018] Through the design of the inner skeleton, the outer skeleton and the limiting skeleton, the retention of the oil seal structure is improved, ensuring a tighter seal between the oil seal and the hub axle housing and the shaft, so that due to the stability and retention of the interference fit between the hub axle housing and the shaft, the risk of hub lubricating oil leakage is reduced, the penetration of the muddy water mixture is effectively blocked, the interior of the hub is protected from contamination, and it is adapted to harsh working conditions. Especially designed for heavy engineering vehicles, it can cope with the harsh working environment of frequent shuttling between the construction site and the city, and maintain a stable sealing effect. Secondly, the excellent sealing performance helps to reduce the lubricating oil leakage and the entry of pollutants into the hub assembly, effectively prevent the muddy water from entering the inside of the axle housing, reduce the wear of components such as bearings and gears, and thus extend the overall service life. Furthermore, the limiting skeleton mainly plays a role in restricting the axial movement of the shaft sleeve 4, improving the structural stability of the oil seal.

[0019] By providing the main lip, the first mud-proof lip and the second mud-proof lip, multiple sealing lips are formed to enhance the sealing performance of the oil seal. The design of multiple sealing lips forms a multi-level sealing barrier, effectively blocking the intrusion of external dust, sediment and other impurities. The main lip, the first mud-proof lip and the first mud-proof lip can all work independently. The main lip prevents the leakage of oil and grease in the front and rear axles. The second mud-proof lip and the shaft sleeve mainly prevent the muddy water from leaking into the main lip and prevent the muddy water from entering the front and rear axle housings. The first mud-proof lip and the shaft sleeve prevent the mud from entering the second mud-proof lip. Even if one of them deteriorates in performance due to wear, the other sealing lips can still continue to provide effective sealing, thus greatly extending the service life and reliability of the oil seal, preventing the muddy water from entering the front and rear axle housings, and effectively protecting the bearings in the axle housing. Description of the Drawings

[0020] Figure 1 is the first three-dimensional view in the embodiment of the present application;

[0021] Figure 2 is the second three-dimensional view in the embodiment of the present application;

[0022] Figure 3 is the cross-sectional view in the embodiment of the present application;

[0023] Figure 4 is the partial cross-sectional view in the embodiment of the present application;

[0024] Figure 5 is the schematic diagram of the oil seal assembly in the embodiment of the present application.

[0025] Explanation of the reference numerals: 1. limit frame; 101. assembly space; 102. through hole; 2. spring; 3. external oil seal; 301. external frame; 3011. upper bending portion; 3012. lower bending portion; 302. first rubber member; 3021. main lip; 3022. first anti-mud lip; 3023. first lubrication space; 3024. second anti-mud lip; 3025. second lubrication space; 3026. third lubrication space; 3029. extension portion; 3030. annular groove; 3031. guide portion; 4. bushing; 401. internal frame; 4011. support portion; 402. second rubber member; 4021. inner convex ring; 4022. inner convex strip. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that each technical feature and the overall technical solution of the present application can be understood intuitively and vividly, but it cannot be understood as a limitation on the scope of protection of the present application.

[0027] In the description of this application, if there is a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When a feature is referred to as "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0028] In the description of this application, if "several" is involved, it means one or more, if "multiple" is involved, it means more than two, if "greater than", "less than", "exceed", they should be understood as not including the number, if "above", "below", "within" are involved, they should be understood as including the number. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In addition, unless otherwise defined, the technical terms and scientific terms used in this application shall have the same meanings as those commonly understood by those skilled in the art to which this application pertains. The terms used in this application are only for describing specific embodiments and are not intended to limit this application. It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0030] Embodiment: As Figures 1-5 shown, an oil seal for an automobile wheel hub further includes a limiting skeleton 1, a spring 2, an outer oil seal 3 for assembling with a bridge housing, and a bushing 4 for assembling with a shaft. The outer oil seal 3 includes an outer skeleton 301. A first rubber member 302 is wrapped around the side of the outer skeleton 301 facing outward. The outer skeleton 301 is provided with several groups of bent portions. The bushing 4 includes an inner skeleton 401. A second rubber member 402 is wrapped around the side of the inner skeleton 401 facing outward. One end of the limiting skeleton 1 is connected to the inner skeleton 401, and the other end of the limiting skeleton 1 is bent downward to form an assembly space 101. One end of the outer skeleton 301 is located in the assembly space 101, that is, between the limiting skeleton 1 and the inner skeleton 401 of the outer skeleton 301. The other end of the outer skeleton 301 is located obliquely above the top wall of the inner skeleton 401. The first rubber member 302 located in the assembly space 101 protrudes along the inner side wall of the inner skeleton 401 to form a main lip 3021. The spring 2 is sleeved on the main lip 3021 for radially limiting the bushing 4.

[0031] Through the design of the inner skeleton 401, the outer skeleton 301, and the limiting skeleton 1, the retention of the oil seal structure is improved, ensuring that the seal between the oil seal and the wheel hub bridge housing and the shaft is tighter. Due to the stability and retention of the interference fit between the wheel hub bridge housing and the shaft, the risk of wheel hub lubricating oil leakage is reduced, effectively blocking the penetration of muddy water mixtures, protecting the interior of the wheel hub from contamination, adapting to harsh working conditions, especially designed for heavy engineering vehicles, and capable of coping with the harsh working environment of frequently shuttling between construction sites and cities and maintaining a stable sealing effect. Secondly, the excellent sealing performance helps to reduce the leakage of lubricating oil and the entry of pollutants into the wheel hub assembly, effectively preventing muddy water from entering the interior of the bridge housing, reducing the wear of components such as bearings and gears, and thus extending the overall service life. Furthermore, the limiting skeleton mainly functions to limit the axial movement of the bushing 4, improving the structural stability of the oil seal.

[0032] Among them, the outer oil seal 3 is combined into one body by vulcanizing the outer skeleton 301 and the first rubber member 302. The bushing 4 is combined into one body by vulcanizing the inner skeleton 401 and the second rubber member 402. The limiting skeleton 1 is assembled with the inner skeleton 401 through a hemming machine. The bushing 4 and the outer skeleton 301 are assembled to form the oil seal.

[0033] Among them, the first rubber part 302 and the second rubber part 402 are made of fluororubber with high temperature resistance in the prior art, which is beneficial to slowing down the heat generated by the mutual friction during the relative rotation of the oil seal and preventing the rubber from aging. It can meet the use requirements of the hub sealing shaft of the front and rear axles of the automobile. The fluororubber with high temperature resistance has better wear resistance, stronger high and low temperature resistance, resistance to mineral oil, and low friction coefficient in the prior art. Its specific performance can reach -40°C for low temperature resistance and above 250°C for high temperature resistance.

[0034] In order to improve the rigidity of the outer skeleton 301, two sets of bending parts are provided on the outer skeleton 301. The two sets of bending parts are arranged staggeredly up and down, making the outer skeleton 301 in a W shape. The two sets of bending parts are the upper bending part 3011 and the lower bending part 3012 respectively. The lower bending part 3012 is located obliquely below the upper bending part 3011 and close to the limiting skeleton 1. By setting two sets of bending parts on the outer skeleton 301, the overall rigidity of the oil seal is enhanced, and its anti-deformation ability under harsh working conditions is also improved by dispersing stress, maintaining a tight fit between the oil seal and the shaft and the axle housing, ensuring a stable sealing effect of the oil seal. Secondly, it helps to form a more complex sealing path between the oil seal and the hub axle housing, thereby more effectively blocking the penetration of mud and other pollutants. Moreover, the setting of the lower bending part 3012 close to the limiting skeleton 1 helps to optimize the stress condition of the main lip 3021. Under the synergistic action of the elastic force of the spring 2, the main lip 3021 can fit more evenly on the inner side wall of the inner skeleton 401, forming a more reliable sealing barrier. At the same time, this design also helps to reduce the wear of the sealing lip caused by uneven stress.

[0035] To enhance the supporting effect of the inner skeleton 401 on the outer skeleton 301, thereby improving the shape retention of the oil seal, the inner skeleton 401 extends towards the outer skeleton 301 so that the inner skeleton 401 is arranged in an L shape. The bottom wall of the inner skeleton 401 protrudes towards the bottom wall of the outer skeleton 301 to form a supporting portion 4011. The L-shaped inner skeleton 401 forms a more stable supporting structure with the outer skeleton 301 through its extending portion 3029 and the protruding supporting portion 4011, enhancing the rigidity of the entire oil seal structure, enabling it to better resist external pressure and deformation, and thus maintaining the shape and sealing performance of the oil seal. Secondly, the L-shaped design of the inner skeleton 401 and the supporting portion 4011 can effectively disperse and transfer the forces from the shaft or the hub axle housing, helping to reduce the stress concentration phenomenon and lowering the risk of damage to the oil seal caused by excessive local stress. Secondly, the supporting portion 4011 of the inner skeleton 401 directly acts on the bottom of the outer skeleton 301, enhancing the contact pressure and sealing tightness between the outer skeleton 301 and the shaft or the hub axle housing, helping to prevent oil leakage and the intrusion of pollutants, and improving the overall performance of the oil seal. Furthermore, the design of the L-shaped inner skeleton 401 and its supporting portion 4011 can effectively reduce the occurrence of such deformation and relaxation phenomena, maintaining the stability of the oil seal shape, and thus ensuring a long-term sealing effect. It is worth mentioning that the bottom wall of the inner skeleton 401 is arranged parallel to the bottom wall of the outer skeleton 301, and the supporting portion 4011 is arranged perpendicular to the bottom wall of the inner skeleton 401.

[0036] To add multiple sealing lips to this oil seal on the basis of the main lip 3021, thereby improving the sealing effect of the oil seal, the first rubber part 302 is further provided with a first anti-mud lip 3022. The first anti-mud lip 3022 is located in the assembly space 101, and the first anti-mud lip 3022 protrudes from the bottom of the first rubber part 302 towards the bottom wall of the inner skeleton 401. The first anti-mud lip 3022 forms an additional sealing lip, enhancing the sealing performance of the oil seal. The design of multiple sealing lips forms a multi-level sealing barrier, effectively blocking the intrusion of external dust, sediment and other impurities. The main lip 3021 and the first anti-mud lip 3022 can work independently. Even if one of them deteriorates due to wear, the other sealing lips can still continue to provide effective sealing, thus greatly extending the service life and reliability of the oil seal.

[0037] Furthermore, the lower end of the first mud guard lip 3022 is gradually inclined towards the support portion 4011, so that a first lubricating space 3023 is formed by enclosing between the first mud guard lip 3022, the bottom wall of the first rubber member 302 and the inner skeleton 401. The first lubricating space 3023 is coated with a lubricating grease resistant to high temperatures above 150 °C, which helps to form an oil film, reduce the frictional torque between the oil seal and the shaft, reduce the frictional heat generation between the two, slow down the aging of the first rubber member 302 and the second rubber member 402, extend the service life, reduce friction, and thus reduce the wear and heat generation of the oil seal. It is worth mentioning that the lubricating grease resistant to high temperatures above 150 °C is available in the market, as long as it can be used for the oil seal, such as high-temperature lithium-based lubricating grease.

[0038] In order to make the lubricating grease better adhere to the inner wall of the first lubricating space 3023, the first rubber member 302 is provided with a convex portion, which protrudes from the bottom of the first rubber member 302 towards the inner skeleton 401. The convex portion is located between the support portion 4011 and the first mud guard lip 3022, thus forming a grease storage groove. When the lubricating grease is coated, part of the lubricating grease is located in the grease storage groove, improving the adhesion effect of the lubricating grease.

[0039] Furthermore, in order to add multiple sealing lips to the oil seal on the basis of the main lip 3021, thereby improving the sealing effect of the oil seal, the first rubber member 302 is further provided with a second mud guard lip 3024. The second mud guard lip 3024 is located below the main lip 3021, and the second mud guard lip 3024 protrudes from the bottom of the main lip 3021 towards the bottom wall of the inner skeleton 401. Adding the second mud guard lip 3024 below the main lip 3021 forms a double-layer or multi-layer sealing structure. Even if the main lip 3021 has a decrease in sealing performance due to wear or aging, the second mud guard lip 3024 can still provide an additional sealing barrier, thus greatly enhancing the sealing effect of the oil seal, enabling it to more effectively block the intrusion of external dust, sediment and other impurities. In addition, the main lip 3021 prevents the leakage of front and rear axle oil and grease, and the second mud guard lip 3024 and the shaft sleeve 4 mainly prevent muddy water from leaking into the main lip 3021 and prevent muddy water from entering the front and rear axle housings. The first mud guard lip 3022 and the shaft sleeve 4 prevent mud from entering the second mud guard lip 3024. The oil seal is provided with multiple sealing lips to prevent muddy water from entering the front and rear axle housings, effectively protecting the bearings in the axle housings and extending the service life of the mud truck and the cement mixer truck. It is worth mentioning that the sealing lips include the main lip 3021, the first mud guard lip 3022, and the second mud guard lip 3024. The main lip 3021 mainly plays a role in sealing oil and grease, the second mud guard lip 3024 mainly plays a role in blocking mud, and the second mud guard lip 3024 mainly plays a role in sealing muddy water.

[0040] Furthermore, a second lubricating space 3025 is formed between the first anti-mud lip 3022, the second anti-mud lip 3024 and the bottom wall of the inner skeleton 401, and a third lubricating space 3026 is formed between the main lip 3021, the second anti-mud lip 3024 and the inner skeleton 401. The first lubricating space 3023 and the second lubricating space 3025 are coated with a grease resistant to temperatures above 150°C, which helps to form an oil film, reduce the frictional torque between the oil seal and the shaft, reduce the frictional heat generation between the two, slow down the aging of the first rubber part 302 and the second rubber part 402, extend the service life, reduce friction, and thus reduce the wear and heat generation of the oil seal.

[0041] In order to improve the uniformity of the radial force provided by the spring 2 to the inner skeleton 401 and enhance the stability of the spring 2 assembly, two sets of springs 2 are provided. One set of springs 2 is sleeved on the side wall of the main lip 3021, and the other set of springs 2 is sleeved on the side wall of the second anti-mud lip 3024. A first spring groove for assembling the spring 2 is provided on the side wall of the main lip 3021, and one set of springs 2 is sleeved in the inner wall of the first spring groove. The second anti-mud lip 3024 is provided with a second spring groove for assembling the spring 2, and the other set of springs 2 is sleeved in the inner wall of the second spring groove. It is worth mentioning that the spring 2 is a tightening spring 2. By arranging two sets of springs 2 up and down, the force on the inner skeleton 401 is equalized, ensuring that the radial force applied to the inner skeleton 401 is more uniform. This not only helps to improve the sealing effect of the oil seal but also reduces the deformation or damage of the oil seal caused by uneven force. The tightening effect of the spring 2 enables the oil seal to fit more tightly on the shaft or the hub bridge shell during the assembly process, reducing the leakage risk caused by the assembly gap. At the same time, the elasticity of the spring 2 can also absorb a certain amount of vibration and impact, enhancing the stability of the oil seal under complex working conditions. In addition, by providing a spring 2 groove for assembling the spring 2, it plays a limiting role on the spring 2, preventing the spring 2 from shifting or falling off during the working process and ensuring the stability and reliability of the radial force provided by the spring 2.

[0042] In order to further improve the sealing effect of the oil seal, the first rubber part 302 is also provided with an extension part 3029. The extension part 3029 protrudes downward from below the lower bending part 3012 and is located on the outer side of the supporting part 4011. By providing the extension part 3029, the sealing barrier between the outer oil seal 3 and the shaft sleeve 4 is enhanced, and the sealing effect of the oil seal is improved.

[0043] Due to the provision of the limiting skeleton 1, when the oil seal is in a rotating state, it will play a certain blocking role on the lubricating oil in the hub, thereby generating a lubricating oil flow pressure. In order to reduce the pressure generated when the oil seal rotates, a number of through holes 102 are provided in the limiting skeleton 1. The through holes 102 penetrate the limiting skeleton 1 from the top wall of the limiting skeleton 1 towards the main lip 3021. By providing the through holes 102, the lubricating oil can enter the space enclosed by the limiting skeleton 1 and the main lip 3021 through the through holes 102. Secondly, the lubricating oil can also flow through the gap between the limiting skeleton 1 and the outer skeleton 301, reducing the flow resistance of the lubricating oil, thereby reducing the pressure. Specifically, 6 through holes 102 are provided, and the through holes 102 are arranged at equal angular intervals at the top of the limiting skeleton 1 with the center of the oil seal as the center of the circle.

[0044] In order to reduce the relative sliding amount between the second rubber part 402 and the shaft, the side wall of the second rubber part 402 in contact with the shaft is provided with a convex inner ring 4021 and inner convex strips 4022. The inner ring 4021 is arranged in a ring shape on the second rubber part 402, and the inner convex strips 4022 are arranged perpendicular to and intersecting with the inner ring 4021 on the second rubber part 402. The inner ring 4021 and the inner convex strips 4022 increase the contact area between the second rubber part 402 and the shaft, forming more biting points and friction surfaces between the two, effectively improving the static friction and dynamic adhesion ability between the two, making it more difficult for the second rubber part 402 and the shaft to relatively slide under the action of the same external force, and thus achieving the purpose of reducing the sliding amount, thereby improving the sealing effect. Secondly, the inner ring 4021 and the inner convex strips 4022, as additional structures on the second rubber part 402, can absorb and buffer vibration energy to a certain extent, especially when used in cooperation with the shaft, which helps to reduce additional friction and wear caused by vibration.

[0045] In the specific structure of the first rubber part 302, a plurality of annular grooves 3030 are provided on the outer wall of the first rubber part 302, and the first rubber part 302 is provided with a guiding part 3031. The guiding part 3031 is located above the annular grooves 3030 and is gradually inclined towards the top wall of the first rubber part 302, which is convenient for the assembly of the oil seal. At the same time, the plurality of grooves also play a role in shock absorption, reducing the risk of oil seal leakage caused by the inclination of the oil seal during press-fitting.

[0046] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or replacements, and these modifications or replacements should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil seal for an automobile wheel hub, characterized in that: It includes a limiting skeleton, a spring, an outer oil seal for assembly with a bridge housing, and a sleeve for assembly with a shaft, wherein the outer oil seal includes an outer skeleton, a first rubber member is wrapped on the outward side of the outer skeleton, and the outer skeleton is provided with a plurality of groups of bending portions, and the sleeve includes an inner skeleton, a second rubber member is wrapped on the outward side of the inner skeleton, one end of the limiting skeleton is connected to the inner skeleton, and the other end of the limiting skeleton is bent downward to form an assembly space, one end of the outer skeleton is located in the assembly space, and the other end of the outer skeleton is located obliquely above the top wall of the inner skeleton, and the first rubber member located in the assembly space is provided with a main lip along the inner side wall protrusion of the inner skeleton, and the spring is sleeved on the main lip for radially limiting the sleeve.

2. The oil seal for an automotive wheel hub according to claim 1, characterized in that: The outer frame is provided with two groups of bending parts, and the two groups of bending parts are staggered up and down. The two groups of bending parts are respectively an upper bending part and a lower bending part. The lower bending part is located below the upper bending part and is close to the limiting frame.

3. The oil seal for an automotive wheel hub according to claim 2, wherein: The inner frame extends toward the outer frame so that the inner frame is arranged in an L shape, and the bottom wall of the inner frame is arranged to protrude toward the bottom wall of the outer frame to form a supporting portion.

4. An oil seal for an automotive wheel hub according to claim 1, characterized in that: The first rubber member is further provided with a first mud-proof lip, the first mud-proof lip is located in the assembly space, and the first mud-proof lip is protruded from the bottom of the first rubber member toward the bottom wall of the inner frame.

5. The oil seal for an automobile wheel hub according to claim 4, characterized in that: The first rubber member is further provided with a second mud-proof lip, which is located below the main lip and protrudes from the bottom of the main lip toward the bottom wall of the inner frame.

6. The oil seal for an automotive wheel hub according to claim 5, characterized in that: The springs are provided in two groups, one group of the springs is sleeved on the side wall of the main lip, and the other group of the springs is sleeved on the side wall of the second anti-mud lip.

7. The oil seal for an automobile wheel hub according to claim 3, wherein: The first rubber member is further provided with an extension portion, which is protruding downward from below the lower bending portion and is located on the outward side of the support portion.

8. The oil seal for an automotive wheel hub according to claim 1, characterized in that: The limiting frame is provided with a plurality of through holes, and the through holes are arranged through the limiting frame from the top wall of the limiting frame toward the main lip.

9. The oil seal for an automotive wheel hub according to claim 1, characterized in that: The side wall of the second rubber member in contact with the shaft has a raised inner convex ring and an inner convex strip. The inner convex ring is annularly arranged on the second rubber member, and the inner convex strip is perpendicular to and intersects with the inner convex ring and is arranged on the second rubber member.

10. The oil seal for an automotive wheel hub according to claim 1, wherein: The outer wall of the first rubber member is provided with a plurality of annular grooves. The first rubber member is provided with a guide portion, which is located above the annular grooves and is gradually inclined toward the top wall of the first rubber member.

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