Automobile wheel hub sealing structure

Abstract

The application discloses a kind of automobile wheel hub sealing structures, including fixed parts, rotating parts and oil seal, fixed parts and rotating parts can relatively rotate, there is cavity between fixed parts and rotating parts, and oil seal is installed at the opening of cavity;Oil seal includes first oil seal, second oil seal and protruding part, one of first oil seal and second oil seal is interference fit with rotating part, and the other is interference fit with fixed part, and sealing passage is formed between first oil seal and second oil seal, protruding part is arranged on first oil seal or second oil seal, and protruding part is arranged at the entrance of sealing passage and extends into sealing passage;The scheme is by adding protruding part on first oil seal or second oil seal, when first oil seal or second oil seal rotates along with rotating part, mud and water splashed to the entrance position of sealing passage is dispersed by protruding part, can greatly reduce the amount of mud and water entering sealing passage, improve the mud and water resistance of oil seal, enhance the sealing performance of sealing structure.

Description

Technical Field

[0001] This invention belongs to the field of automotive sealing technology, and particularly relates to an automotive wheel hub sealing structure. Background Technology

[0002] Automotive wheel hubs typically consist of fixed and rotating components. The wheel hub oil seal is a key sealing component in the automotive wheel hub unit. The wheel hub oil seal is fitted between the fixed and rotating components of the automotive wheel hub to seal the cavity between the fixed and rotating components from the outside, thereby preventing external contaminants such as dust and mud from entering the wheel hub. At the same time, it seals the internal grease, ensuring the normal lubrication and long-term reliable operation of components such as bearings.

[0003] Existing wheel hub oil seals typically include a first oil seal and a second oil seal. The first oil seal is fitted around the second oil seal, and a labyrinth seal structure is formed between the first and second oil seals. The labyrinth path and the contact with the dust lip prevent mud and water from entering, effectively reducing torque, extending the oil seal life, and providing a certain degree of mud and water resistance.

[0004] However, as customers' requirements for mud and water resistance gradually increase, and with the popularization of off-road vehicles, under extremely harsh conditions, such as when vehicles are driving on deep muddy roads or wading through water, a large amount of mud and water splashes at high speed onto the oil seal opening. Although the static labyrinth structure and sealing lip can block some of the mud and water, when the wheel hub rotates at high speed, the mud and water can easily enter between the first and second oil seals through the oil seal opening via centrifugal force. Excessive mud and water gradually accumulate and invade the inside of the oil seal, leading to seal failure. Summary of the Invention

[0005] The purpose of this invention is to provide a wheel hub sealing structure for automobiles, so as to solve the problem that the static labyrinth structure and sealing lip of the existing wheel hub seal cannot prevent mud and water from entering under harsh working conditions.

[0006] To achieve this objective, the present invention adopts the following technical solution: A car wheel hub sealing structure includes a fixed component, a rotating component, and an oil seal, wherein: The fixed component and the rotating component are rotatable relative to each other, and there is a cavity between the fixed component and the rotating component. The oil seal is installed at the opening of the cavity to seal the cavity from the outside. The oil seal includes a first oil seal, a second oil seal, and a protrusion. Both the first oil seal and the second oil seal are annular. The first oil seal is fitted around the second oil seal, and a sealing channel is formed between the first oil seal and the second oil seal. A sealing part for sealing the sealing channel is provided inside the sealing channel. One of the first oil seal and the second oil seal is interference-fitted with the rotating component, and the other is interference-fitted with the fixed component. The protrusion is disposed on the first oil seal or the second oil seal that is interference-fitted with the rotating component. The protrusion is disposed at the entrance of the sealing channel and extends into the sealing channel. The protrusion is configured to disperse mud and water entering the sealing channel when the first oil seal or the second oil seal rotates with the rotating component.

[0007] Optionally, the protrusion includes a plurality of first drainage ribs spaced apart along the circumferential direction on the inner circumferential side of the first oil seal; or, the protrusion includes a plurality of second drainage ribs spaced apart along the circumferential direction on the outer circumferential side of the second oil seal.

[0008] Optionally, the cross-section of the first and second drainage bars can be square, sector-shaped, circular, or arc-shaped.

[0009] Optionally, the first drainage rib is integrally formed with the first oil seal, and the second drainage rib is integrally formed with the second oil seal.

[0010] Optionally, the first drainage rib is fixedly mounted on the first oil seal, and the second drainage rib is fixedly mounted on the second oil seal.

[0011] Optionally, the first drainage rib is inclinedly disposed on the inner circumference of the first oil seal and is movably connected to the first oil seal, and the second drainage rib is inclinedly disposed on the outer circumference of the second oil seal and is movably connected to the second oil seal. When the first oil seal or the second oil seal rotates with the rotating component, the first drainage rib and the second drainage rib are driven to open outward by centrifugal force.

[0012] Optionally, the first oil seal includes a first skeleton and a first elastomer, both of which are annular structures. The first elastomer is disposed on the inner circumferential side of the first skeleton, and the inner circumferential side of the first elastomer is provided with a first sealing lip, at least one second sealing lip, and a third sealing lip in a radially spaced manner from the inside to the outside. The third sealing lip is located radially outside the second sealing lip.

[0013] Optionally, the first frame includes a second horizontal segment, a second vertical segment, a third bent segment, and a third vertical segment, wherein: The second vertical segment is disposed at the end of the second horizontal segment away from the second oil seal, the second vertical segment extends toward the inner circumference of the second horizontal segment, and the second vertical segment is perpendicular to the second horizontal segment; The third bending section is disposed on the inner circumference side of the second vertical section, and the third bending section bends toward the second oil seal; The third vertical segment is disposed on the inner circumference of the third bending segment, and the radius of the third vertical segment is smaller than the radius of the second vertical segment.

[0014] Optionally, the second oil seal includes a second skeleton, which is an annular structure. A coating is applied to the outer peripheral surface of the second skeleton. The first sealing lip and the second sealing lip abut against the coating and are press-fitted with the coating. The cross-section of the second skeleton includes a first vertical segment and a first horizontal segment that are perpendicular to each other. The first horizontal segment is disposed on the inner peripheral side of the first vertical segment and extends axially toward the first oil seal. The second sealing lip abuts against the coating on the outer peripheral surface of the first vertical segment, and the first sealing lip abuts against the coating on the outer peripheral surface of the first horizontal segment.

[0015] Optionally, a second elastic body is provided on the inner peripheral side of the second skeleton, and at least one ring of first protrusions is provided on the inner surface of the second elastic body. The outer peripheral side of the first skeleton is partially exposed. The first elastic body covers the inner peripheral side of the first skeleton and the outer peripheral end of the first skeleton. At least one ring of second protrusions is provided on the outer surface of the first elastic body. The second elastic body completely covers the outer peripheral edge of the second skeleton. The outer peripheral edge of the second elastic body is provided with a second bent section extending toward the first oil seal. The second bent section and the third sealing lip are radially staggered and have overlapping portions to cooperate in forming a sealing part.

[0016] Compared with the prior art, the automotive wheel hub sealing structure provided by the present invention has the following advantages: 1. This solution incorporates drainage ribs on the first or second oil seal, which is interference-fitted with the rotating component. These ribs are positioned at the entrance of the sealing channel. When the vehicle travels and the wheel hub rotates at high speed, the drainage ribs rotate synchronously, forming a dynamic centrifugal barrier. This actively disperses and disturbs splashed mud and water attempting to enter the sealing channel through the entrance. The centrifugal force generated by the rotation then throws the dispersed mud, water droplets, or impurities outwards, effectively preventing them from penetrating the sealing channel. Compared to the passive blocking methods of existing technologies that rely entirely on static labyrinths and sealing lips, this solution, by introducing an active deflection structure on the rotating component, fundamentally alters the intrusion path and dynamic characteristics of mud and water. This effectively delays or even eliminates the accumulation of mud and water in the sealing channel, thus maintaining the sealing reliability of the vehicle wheel hub even under extreme conditions such as deep mud and wading.

[0017] 2. The drainage ribs in this design are arranged at intervals along the circumference. The drainage ribs themselves are lightweight and have low inertia. When rotating with the rotating parts, they only generate minor air disturbances and fluid shear forces, and basically do not increase additional rotational resistance. Combined with the low-friction coefficient coating on the outer circumference of the second skeleton, the dynamic friction between the first and second sealing lips and the coating is effectively reduced. This allows the entire oil seal to achieve high mud and water resistance without sacrificing the advantages of low torque and low power consumption. In this design, the drainage ribs can be set on the inner circumference of the first oil seal or the outer circumference of the second oil seal, thus flexibly adapting to different rotational conditions and having wide versatility. Attached Figure Description

[0018] To more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the accompanying drawings used in the background technology and embodiment descriptions of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of one embodiment of the automobile wheel hub sealing structure proposed in this invention.

[0020] Figure 2 This is a schematic diagram of the second drainage rib in an embodiment of the automobile wheel hub sealing structure proposed in this invention.

[0021] Figure 3 This is a three-dimensional structural diagram of Embodiment 2 of the automobile wheel hub sealing structure proposed in this invention.

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the first drainage rib in Embodiment 2 of the automobile wheel hub sealing structure proposed in this invention.

[0023] Figures 1 to 4 The following reference numerals are included: Fixed component 1; Rotating component 2; First oil seal 31; First frame 311; Second horizontal section 3111; Second vertical section 3112; Third bending section 3113; Third vertical section 3114; First elastic body 312; First sealing lip 3121; Second sealing lip 3122; Third sealing lip 3123; Second oil seal 32; Second frame 321; First vertical section 3211; First horizontal section 3212; Second elastic body 322; First protrusion 3221; Second protrusion 3222; First drainage rib 4; Second drainage rib 5. Detailed Implementation

[0024] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 Please see Figure 1 and Figure 4 As shown, this embodiment provides a sealing structure for an automobile wheel hub, including a fixed component 1, a rotating component 2, and an oil seal. The fixed component 1 and the rotating component 2 are rotatable relative to each other, and a cavity is formed between the fixed component 1 and the rotating component 2. The oil seal is installed at the opening of the cavity to seal the cavity from the outside. The oil seal includes a first oil seal 31, a second oil seal 32, and a protrusion. Both the first oil seal 31 and the second oil seal 32 are annular. The first oil seal 31 is fitted around the second oil seal 32, and a sealing channel is formed between the first oil seal 31 and the second oil seal 32. A sealing part for sealing the sealing channel is provided in the sealing channel. One of the first oil seal 31 and the second oil seal 32 is press-fitted with the rotating component 2, and the other is press-fitted with the fixed component 1. The protrusion is provided on the first oil seal 31 or the second oil seal 32 that is press-fitted with the rotating component 2. The protrusion is located at the entrance of the sealing channel and extends into the sealing channel. The protrusion is configured to disperse mud and water entering the sealing channel when the first oil seal 31 or the second oil seal 32 rotates with the rotating component 2.

[0026] This design incorporates a protrusion on the first oil seal 31, which is interference-fitted with the rotating component 2. This protrusion engages at the entrance of the sealing channel. When the vehicle travels, causing the wheel hub to rotate at high speed, the protrusion rotates synchronously, forming a dynamic centrifugal barrier. This barrier actively disperses and disturbs splashed mud and water attempting to enter the sealing channel through the entrance. The centrifugal force generated by the rotation then throws the dispersed mud, water droplets, or impurities outwards, effectively preventing them from penetrating the sealing channel. Compared to the passive blocking method of existing technologies that rely entirely on static labyrinths and sealing lips, this design, by introducing an active deflection structure on the rotating component 2, fundamentally alters the intrusion path and dynamic characteristics of mud and water, effectively delaying or even eliminating the accumulation of mud and water in the sealing channel. This ensures the sealing reliability of the vehicle wheel hub even under extreme conditions such as deep mud and wading.

[0027] In one embodiment, the protrusion includes a plurality of first drainage ribs 4 spaced apart along the circumferential direction on the inner circumferential side of the first oil seal 31.

[0028] It can be seen that by setting the protrusion as multiple first drainage ribs, a protrusion with a simple structure and easy implementation is provided. Moreover, the drainage ribs themselves are lightweight and have low inertia. When they rotate with the rotating component 2, they only generate minor air disturbance and fluid shear force, and basically do not increase additional rotational resistance.

[0029] In one embodiment, the cross-section of the first drainage rib 4 is any one of square, fan-shaped, circular or arc-shaped.

[0030] Preferably, the first drainage rib 4 has a fan-shaped structure, and multiple first drainage ribs are arranged at equal intervals.... Various types of first drainage bars 4 and second drainage bars 5 are provided to meet different needs and have good adaptability.

[0031] In one embodiment, the first drainage rib 4 is integrally formed with the first oil seal 31, and the second drainage rib 5 is integrally formed with the second oil seal 32, providing a first drainage rib 4 and a second drainage rib 5 with a simple structure and easy processing.

[0032] In one embodiment, the first drainage rib 4 is fixedly mounted on the first oil seal 31, and the second drainage rib 5 is fixedly mounted on the second oil seal 32.

[0033] It can be seen that by fixing the first drainage rib 4 and the second drainage rib 5 to the corresponding first oil seal 31 and second oil seal 32, it is not only easy to form, but also enables the first drainage rib 4 and the second drainage rib 5 to maintain a large dispersing force on the mud and water when rotating.

[0034] In one embodiment, the first drainage rib 4 is inclinedly disposed on the inner circumferential side of the first oil seal 31 and is movably connected to the first oil seal 31, and the second drainage rib 5 is inclinedly disposed on the outer circumferential side of the second oil seal 32 and is movably connected to the second oil seal 32. When the first oil seal 31 or the second oil seal 32 rotates with the rotating component 2, the first drainage rib 4 and the second drainage rib 5 are driven to open outward by centrifugal force.

[0035] It can be seen that by movably connecting the first drainage rib 4 and the second drainage rib 5 to the corresponding first oil seal 31 and second oil seal 32, the first drainage rib 4 and the second drainage rib 5 can maintain a small volume when stationary, which facilitates the assembly of the first oil seal 31 and the second oil seal 32; at the same time, the first drainage rib 4 and the second drainage rib 5 open by centrifugal force when rotating, which can increase the coverage area of ​​the first drainage rib 4 and the second drainage rib 5, and further improve the mud and water resistance of the oil seal.

[0036] In one embodiment, the first oil seal 31 includes a first skeleton 311 and a first elastic body 312. Both the first skeleton 311 and the first elastic body 312 are annular structures. The first elastic body 312 is disposed on the inner circumferential side of the first skeleton 311. The inner circumferential side of the first elastic body 312 is provided with a first sealing lip 3121, at least one second sealing lip 3122, and a third sealing lip 3123 in a radially spaced manner from the inside to the outside. The third sealing lip 3123 is located radially outside the second sealing lip 3122. The second oil seal 32 includes a second skeleton 321, which is an annular structure. The outer peripheral surface of the second skeleton 321 is coated with a coating. The first sealing lip 3121 and the second sealing lip 3122 abut against the coating and are interference-fitted with the coating. The cross-section of the second skeleton 321 includes a first vertical segment 3211 and a first horizontal segment 3212 that are perpendicular to each other. The first horizontal segment 3212 is located on the inner peripheral side of the first vertical segment 3211 and extends axially toward the first oil seal 31. The second sealing lip 3122 abuts against the coating on the outer peripheral surface of the first vertical segment 3211, and the first sealing lip 3121 abuts against the coating on the outer peripheral surface of the first horizontal segment 3212.

[0037] Specifically, both the first frame 311 and the second frame 321 are made of metal.

[0038] Specifically, the first oil seal 31 is pressed and fixed to the periphery of the second oil seal 32 by an inverted snap.

[0039] Specifically, the coating is a PTFE coating.

[0040] This solution reduces the friction generated by the first sealing lip 3121 and the second sealing lip 3122 during operation by coating the outer peripheral surface of the second skeleton 321 with a coating of low friction coefficient, thereby achieving a torque reduction effect. At the same time, the reduction of friction can also reduce the wear on the sealing lip, which is beneficial to extending the service life of the oil seal. The coating process is simpler, less affected by temperature, and the coating thickness is greater when the coating is applied to the second skeleton 321.

[0041] In one implementation, a coating is provided covering the outer peripheral surface of the second skeleton. The coating is made of a hydrophobic material to give the coating hydrophobic properties and prevent mud and water from accumulating at the sealing lip.

[0042] In one implementation, the coating has a friction coefficient λ≦0.4, a coating thickness H≧3µm, and a coating roughness Ra of 0.1~1.0.

[0043] This solution ensures the durability of the coating by setting the coefficient of friction, thickness, and roughness of the coating, while reducing the torque of the oil seal.

[0044] In one embodiment, two second sealing lips 3122 are arranged radially at intervals. The interference fit between the outer second sealing lip 3122 and the coating is greater than that between the inner second sealing lip 3122 and the coating. The second sealing lip 3122 and the third sealing lip 3123 are arranged radially outward at an angle, and the first sealing lip 3121 is arranged axially towards one side of the first oil seal 31.

[0045] This solution improves the sealing effect of the oil seal by setting two second sealing lips 3122; at the same time, the interference fit between the two sealing lips 3122 and the coating not only improves the sealing effect, but also reduces the friction between the inner second sealing lip 3122 and the coating, thus reducing torque; the third sealing lip 3123 is tilted radially outward, which makes the outlet of the labyrinth structure smaller and has a certain function of storing mud and water, further reducing the amount of mud and water intrusion.

[0046] In one embodiment, the first frame 311 includes a second horizontal segment 3111, a second vertical segment 3112, a third bent segment 3113, and a third vertical segment 3114. The second vertical segment 3112 is disposed at the end of the second horizontal segment 3111 away from the second oil seal 32, and extends toward the inner circumference of the second horizontal segment 3111, perpendicular to the second horizontal segment 3111. The third bent segment 3113 is disposed on the inner circumference of the second vertical segment 3112. The three-bend section 3113 bends toward the second oil seal 32; the third vertical section 3114 is located on the inner circumference of the third bend section 3113, and the radius of the third vertical section 3114 is smaller than the radius of the second vertical section 3112; this solution facilitates the press-fitting of the first oil seal 31 and the second oil seal 32 by setting the first frame 311 with the second horizontal section 3111, the second vertical section 3112, the third bend section 3113 and the third vertical section 3114, and at the same time improves the overall rigidity of the first oil seal 31.

[0047] In one embodiment, a second elastic body 322 is provided on the inner peripheral side of the second skeleton 321, and at least one ring of first protrusions 3221 is provided on the inner surface of the second elastic body 322. The outer peripheral side of the first skeleton 311 is exposed. The first elastic body 312 covers the inner peripheral side of the first skeleton 311 and the outer peripheral end of the first skeleton 311. At least one ring of second protrusions 3222 is provided on the outer surface of the first elastic body 312. The second elastic body 322 completely covers the outer peripheral edge of the second skeleton 321. The outer peripheral edge of the second elastic body 322 is provided with a second bent section extending toward the first oil seal 31. The second bent section and the third sealing lip 3123 are arranged radially and have overlapping portions to cooperate to form a sealing part.

[0048] This solution improves not only the insertability of the oil seal by providing a first protrusion 3221 on the inner side of the second elastic body 322 and a second protrusion 3222 on the outer side of the first elastic body 312, but also the sealing performance of the outer and inner circumferential sides of the oil seal.

[0049] Example 2 The main difference between Embodiment 2 and Embodiment 1 lies in the placement of the drainage ribs; the other structures are largely the same and will not be described further. In this embodiment, the rotating component 2 is configured to rotate relative to the fixed component 1; the oil seal is installed at the opening of the cavity between the fixed component 1 and the rotating component 2.

[0050] Specifically, the oil seal includes a first oil seal 31, a second oil seal 32, and a protrusion. The first oil seal 31 is interference-fitted with the fixed component 1 to remain stationary. The second oil seal 32 is interference-fitted with the rotating component 2 to rotate synchronously with the rotating component 2.

[0051] The protrusion includes a plurality of second drainage ribs 5 spaced circumferentially on the outer periphery of the second oil seal 32. Each second drainage rib 5 is located at the entrance of the sealing channel formed between the first oil seal 31 and the second oil seal 32, and extends into the sealing channel from the outer periphery of the second oil seal 32 toward the inner periphery of the first oil seal 31. The cross-section of the second drainage rib 5 can be any of square, fan-shaped, circular or arc-shaped. In this embodiment, an arc-shaped cross-section similar to a fan blade is preferred to optimize the hydrodynamic performance.

[0052] The working principle of this embodiment is as follows: When the vehicle is in motion, the rotating component 2 rotates at high speed, and the second oil seal 32, which is interference-fitted with the rotating component 2, drives the multiple second drainage ribs 5 on it to rotate at high speed together; mud and water splashed from the outside try to enter through the opening of the sealing channel. At this time, the rotating second drainage rib 5 is like a miniature centrifugal impeller, and its fan-shaped structure can actively impact, cut and disperse the mud and water flow that is trying to enter; at the same time, relying on the strong centrifugal force generated by the rotation, the dispersed mud, water droplets and impurities are thrown outward from the entrance of the sealing channel, so that they cannot penetrate into the interior of the sealing channel; this dynamic process greatly reduces the amount of mud and water entering between the first oil seal 31 and the second oil seal 32, effectively preventing the accumulation of mud and water, thereby significantly improving the mud and water resistance and overall sealing performance of the oil seal under the rotating condition of the rotating component 2.

[0053] Example 3 The main difference between Embodiment 3 and Embodiment 1 lies in the placement of the drainage ribs; the other structures are largely the same and will not be described further. In this embodiment, the fixing component 1 is configured to rotate relative to the rotating component 2, and the oil seal is installed at the opening of the cavity between the two.

[0054] Specifically, the first oil seal 31 is interference-fitted with the fixed component 1, so that it can rotate synchronously with the fixed component 1, and the second oil seal 32 is interference-fitted with the rotating component 2, so that it remains stationary.

[0055] The protrusion includes a plurality of first drainage ribs 4 spaced apart along the circumferential direction on the inner circumferential side of the first oil seal 31. Each first drainage rib 4 is located at the entrance of the sealing channel formed between the first oil seal 31 and the second oil seal 32, and extends into the sealing channel from the inner circumferential side of the first oil seal 31 toward the outer circumferential side of the second oil seal 32. The cross-section of the first drainage rib 4 can also be any one of square, fan-shaped, circular or arc-shaped. In this embodiment, it is preferably fan-shaped.

[0056] The working principle of this embodiment is as follows: When the fixed component 1 rotates at high speed, the first oil seal 31, which is interference-fitted with the fixed component 1, drives the multiple first drainage ribs 4 on its inner circumference to rotate at high speed together. At this time, mud and water splashed from the outside attempt to enter through the opening of the sealing channel. The rotating fan-shaped first drainage ribs 4 actively disperse and cut the mud and water flow that is trying to enter, and use the centrifugal force generated by the rotation to throw the mud and water and impurities outward from the entrance of the sealing channel. Through this dynamic and active protection mechanism, mud and water are effectively prevented from entering the sealing channel between the first oil seal 31 and the second oil seal 32, which significantly improves the mud and water resistance and sealing reliability of the oil seal under the condition of rotation of the fixed component 1.

[0057] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above examples. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for an automobile wheel hub, comprising a fixed component, a rotating component, and an oil seal, wherein: The fixed component and the rotating component are rotatable relative to each other, and there is a cavity between the fixed component and the rotating component. The oil seal is installed at the opening of the cavity to seal the cavity from the outside. The oil seal is characterized in that it includes a first oil seal, a second oil seal, and a protrusion. Both the first oil seal and the second oil seal are annular. The first oil seal is fitted around the second oil seal, and a sealing channel is formed between the first oil seal and the second oil seal. A sealing part for sealing the sealing channel is provided inside the sealing channel. One of the first oil seal and the second oil seal is interference-fitted with the rotating component, and the other is interference-fitted with the fixed component. The protrusion is disposed on the first oil seal or the second oil seal that is interference-fitted with the rotating component. The protrusion is disposed at the entrance of the sealing channel and extends into the sealing channel. The protrusion is configured to disperse mud and water entering the sealing channel when the first oil seal or the second oil seal rotates with the rotating component.

2. The automotive wheel hub sealing structure according to claim 1, characterized in that, The protrusion includes a plurality of first drainage ribs spaced apart along the circumferential direction on the inner circumferential side of the first oil seal; or, the protrusion includes a plurality of second drainage ribs spaced apart along the circumferential direction on the outer circumferential side of the second oil seal.

3. The automotive wheel hub sealing structure according to claim 2, characterized in that, The cross-section of the first and second drainage bars can be square, fan-shaped, circular, or arc-shaped.

4. The automotive wheel hub sealing structure according to claim 2, characterized in that, The first drainage rib is integrally formed with the first oil seal, and the second drainage rib is integrally formed with the second oil seal.

5. The automotive wheel hub sealing structure according to claim 2, characterized in that, The first drainage rib is fixedly installed on the first oil seal, and the second drainage rib is fixedly installed on the second oil seal.

6. The automotive wheel hub sealing structure according to claim 2, characterized in that, The first drainage rib is inclinedly disposed on the inner circumference of the first oil seal and is movably connected to the first oil seal. The second drainage rib is inclinedly disposed on the outer circumference of the second oil seal and is movably connected to the second oil seal. When the first oil seal or the second oil seal rotates with the rotating component, the first drainage rib and the second drainage rib are driven to open outward by centrifugal force.

7. The automotive wheel hub sealing structure according to claim 1, characterized in that, The first oil seal includes a first skeleton and a first elastomer. Both the first skeleton and the first elastomer are annular structures. The first elastomer is disposed on the inner circumferential side of the first skeleton. The inner circumferential side of the first elastomer is provided with a first sealing lip, at least one second sealing lip, and a third sealing lip in a radially spaced manner from the inside to the outside. The third sealing lip is located radially outside the second sealing lip.

8. The automotive wheel hub sealing structure according to claim 7, characterized in that, The first frame includes a second horizontal segment, a second vertical segment, a third bending segment, and a third vertical segment, wherein: The second vertical segment is disposed at the end of the second horizontal segment away from the second oil seal, the second vertical segment extends toward the inner circumference of the second horizontal segment, and the second vertical segment is perpendicular to the second horizontal segment; The third bending section is disposed on the inner circumference side of the second vertical section, and the third bending section bends toward the second oil seal; The third vertical segment is disposed on the inner circumference of the third bending segment, and the radius of the third vertical segment is smaller than the radius of the second vertical segment.

9. The automotive wheel hub sealing structure according to claim 7, characterized in that, The second oil seal includes a second skeleton, which is an annular structure. A coating is applied to the outer peripheral surface of the second skeleton. The first sealing lip and the second sealing lip abut against the coating and are press-fitted with the coating. The cross-section of the second skeleton includes a first vertical segment and a first horizontal segment that are perpendicular to each other. The first horizontal segment is located on the inner peripheral side of the first vertical segment and extends axially toward the first oil seal. The second sealing lip abuts against the coating on the outer peripheral surface of the first vertical segment, and the first sealing lip abuts against the coating on the outer peripheral surface of the first horizontal segment.

10. The automotive wheel hub sealing structure according to claim 9, characterized in that, The second skeleton has a second elastic body on its inner circumference. The inner surface of the second elastic body has at least one ring of first protrusions. The outer circumference of the first skeleton is partially exposed. The first elastic body covers the inner circumference of the first skeleton and the outer circumference of the first skeleton. The outer surface of the first elastic body has at least one ring of second protrusions. The second elastic body completely covers the outer circumference of the second skeleton. The outer circumference of the second elastic body has a second bent section extending toward the first oil seal. The second bent section and the third sealing lip are radially staggered and have overlapping portions to cooperate in forming a sealing part.

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