Hub bearing assembly

Abstract

The hub bearing assembly comprises an inner ring used for being matched with a hub, an outer ring used for being matched with a vehicle frame, a sealing assembly achieving a sealing function and an air bag ring, a sealing groove is formed in the peripheral face of the inner ring in a surrounding mode, a limiting lip edge is arranged on one side of the outer ring in a surrounding mode, and the sealing assembly comprises an annular sealing frame and an annular sealing lip. The annular sealing frame and the annular sealing lip are clamped and fixed, and the periphery of the annular sealing lip tightly abuts against the inner wall of the sealing groove and the inner end face of the outer ring, the airbag ring filled with the preset pressure gas is arranged in the sealing groove, and the annular sealing frame is continuously pushed through the airbag ring filled with the preset pressure gas; when the temperature rises, air in the air bag ring is expanded and pressurized, the attaching strength is further enhanced, when the temperature drops, the elastic restoring force of the air bag ring compensates for a lip contraction gap, and the problem that the sealing performance of a traditional structure fluctuates due to temperature changes is effectively solved.

Description

Technical Field

[0001] This invention relates to the technical field of key components of automotive chassis systems, specifically to a wheel hub bearing assembly. Background Technology

[0002] Wheel hub bearing assemblies are core load-bearing components in automotive chassis systems. They not only need to withstand the weight of the vehicle itself and the radial and axial loads during driving, but also need to ensure the smooth rotation of the wheels, resist the intrusion of external impurities such as dust, mud, and sand, and prevent the leakage of internal lubricating grease. Therefore, sealing performance is a key indicator that determines the service life and operational safety of wheel hub bearing assemblies.

[0003] In the existing technology, the sealing structure of wheel hub bearings mostly adopts a combination of elastic lip and metal skeleton, and the seal is achieved by interference fit between the lip and the sealing surface.

[0004] However, this traditional sealing structure has obvious defects: on the one hand, the elastic lip is prone to fatigue aging under long-term compression, which leads to a gradual decrease in interference and a significant decline in sealing performance over time, which in turn causes problems such as grease leakage and impurity intrusion, shortening the service life of the bearing. On the other hand, the vibration and temperature changes generated during vehicle operation will cause the fit between the sealing component and the sealing surface to be unstable. In particular, the hardness of the elastic lip increases and the sealing performance weakens in low-temperature environments, while the lip softens and gaps are prone to appear in high-temperature environments, further aggravating the risk of seal failure.

[0005] More importantly, traditional sealing structures lack redundant design. Once the fit between the lip and the sealing surface is disrupted, it directly leads to seal failure and fails to provide basic protection for the bearing.

[0006] In addition, although some improved sealing structures attempt to improve the sealing effect by increasing the number of lips, due to the lack of a stable pressure compensation mechanism, the multi-lip structure still cannot always maintain a tight fit with the sealing surface. The sealing reliability under complex working conditions still needs to be improved, and the problem of overall seal collapse due to the failure of a single sealing path has not been solved.

[0007] Therefore, developing a wheel hub bearing assembly that can maintain excellent sealing performance over a long period of time has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] To achieve the above objectives, the present invention provides the following technical solution: A wheel hub bearing assembly includes an inner ring for mating with a wheel hub, an outer ring for mating with a vehicle frame, and a sealing component and an airbag ring for achieving a sealing function. A sealing groove is provided around the outer circumference of the inner ring, and a limiting lip is provided around one side of the outer ring; The sealing assembly includes an annular sealing frame and an annular sealing lip. The annular sealing frame and the annular sealing lip are snapped together and fixed. The outer periphery of the annular sealing lip is in close contact with the inner wall of the sealing groove and the inner end face of the outer ring. This mating structure alone can achieve basic sealing. The airbag ring is embedded on one side of the annular sealing frame, and one side of the airbag ring abuts against the limiting lip edge of the outer ring. The airbag ring is filled with gas at a preset pressure, so that the gas pressure pushes the annular sealing frame to keep the annular sealing lip in close contact with the inner wall of the sealing groove and the inner end face of the outer ring, thereby further enhancing the sealing effect.

[0009] Furthermore, the outer circumference of the inner ring is also surrounded by an inner rail groove, and the inner circumference of the outer ring is surrounded by an outer rail groove corresponding to the inner rail groove. A hub bearing is installed in the space formed by the inner rail groove and the outer rail groove, so that the inner ring and the outer ring can be rotatably engaged through the hub bearing. The sealing groove is located on one side of the inner rail groove.

[0010] Furthermore, the top of the annular sealing frame is positioned by contact with the inner end face of the outer ring to achieve axial positioning of the sealing assembly.

[0011] Furthermore, the annular sealing lip adopts a multi-lip structure, and the outer periphery of each lip is interference-fitted with the inner wall of the sealing groove.

[0012] Furthermore, a guide slope is provided on the side of the annular sealing lip away from the annular sealing frame. The guide slope is inclined toward the groove opening of the sealing groove to facilitate the installation of the sealing assembly.

[0013] Furthermore, the annular sealing frame is integrally formed from a metal material, which can be stainless steel, aluminum alloy, or titanium alloy, to ensure the structural rigidity of the sealing assembly.

[0014] Furthermore, the annular sealing frame is provided with an annular protrusion for engaging with the annular sealing lip. The surface of the annular protrusion is provided with anti-slip teeth, and the inner circumference of the annular sealing lip is provided with a protruding ridge that matches the anti-slip teeth, so as to enhance the connection stability between the annular sealing frame and the annular sealing lip.

[0015] Furthermore, the hub bearing includes several rolling elements and a retainer for restraining the rolling elements. The retainer has pockets corresponding to the rolling elements, and the inner wall of the pockets has an arc-shaped guide surface to reduce the frictional resistance of the rolling elements during operation.

[0016] Furthermore, a hub mounting ring is fixedly provided at one end of the inner ring, and a number of threaded holes for connecting the hub are evenly opened along the circumferential direction on the hub mounting ring. The other end of the inner ring is provided with a lead screw, on which a fastener for locking the axial position of the inner ring is threaded.

[0017] Furthermore, a frame mounting ring is fixedly provided at one end of the outer ring. The frame mounting ring has several threaded holes evenly opened along the circumference for connecting to the frame, and a sensor mounting cover for protecting the sensor can be detachably installed on the frame mounting ring.

[0018] In summary, the present invention has the following beneficial technical effects: This invention solves the problem of sealing performance fluctuation caused by temperature changes in traditional structures by setting an airbag ring filled with a preset pressure gas in the sealing groove. The airbag ring continuously pushes the annular sealing frame, ensuring that the annular sealing lip is always in close contact with the inner wall of the sealing groove and the inner end face of the outer ring. When the temperature rises, the gas in the airbag ring expands and increases in pressure, further strengthening the fit. When the temperature drops, the elastic recovery force of the airbag ring compensates for the lip contraction gap, effectively solving the problem of sealing performance fluctuation caused by temperature changes in traditional structures.

[0019] In this invention, the continuous pressure of the air bladder ring can counteract the fatigue aging effect caused by long-term compression of the annular sealing lip, prevent the interference fit from decreasing over time, reduce the risk of grease leakage and impurity intrusion, and extend the service life of the bearing.

[0020] This invention enhances sealing reliability and provides multiple protections. The basic seal is formed by the cooperation of the annular sealing lip, the sealing groove, and the inner end face of the outer ring, and the pressure-enhanced seal is achieved with the help of the airbag ring, forming a dual sealing structure. At the same time, the annular sealing lip adopts a multi-lip interference fit design to avoid the problem of the entire seal collapsing when the traditional single sealing path fails, thus improving the sealing stability under complex working conditions. Attached Figure Description

[0021] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts.

[0022] in: Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the inner and outer ring separation structure of the present invention; Figure 4 This is a partial cross-sectional structural diagram of the present invention; Figure 5 This is an enlarged cross-sectional structural diagram of the airbag ring of the present invention; Figure 6 This is a schematic cross-sectional view of the sealing assembly of the present invention.

[0023] Figures 1-6Explanation of reference numerals in the attached drawings: 1. Inner ring; 101. Hub mounting ring; 102. Inner rail groove; 103. Lead screw; 104. Fixing element; 2. Outer ring; 201. Frame mounting ring; 202. Outer rail groove; 3. Sensor mounting cover; 4. Hub bearing; 401. Retainer; 402. Rolling element; 5. Sealing groove; 6. Sealing assembly; 601. Annular sealing frame; 602. Annular sealing lip; 7. Airbag ring; 8. Limiting lip. Detailed Implementation

[0024] According to the technical solution of the present invention, without changing the essential spirit of the present invention, those skilled in the art can propose various interchangeable structural methods and implementations. Therefore, the following detailed embodiments and accompanying drawings are merely exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction of the technical solution of the present invention.

[0025] The following is in conjunction with the appendix Figures 1 to 4 As shown, a hub bearing assembly of the present invention will be described in further detail.

[0026] Example 1 like Figures 1 to 4 As shown, a wheel hub bearing assembly is constructed from an inner ring 1, an outer ring 2, a sensor mounting cover 3, a wheel hub bearing 4, a sealing component 6, and an airbag ring 7. These components, through precise structural fit and assembly processes, form a stable load-bearing transmission system and a full-condition sealing protection system. This enables reliable load transfer, flexible rotational support, and long-term sealing protection during wheel rotation. It is widely adaptable to the needs of various vehicle types, including commercial vehicles, passenger vehicles, and new energy vehicles, effectively reducing problems such as grease leakage, impurity intrusion, and component wear caused by bearing seal failure, significantly reducing vehicle maintenance costs and downtime.

[0027] like Figure 2 As shown, the inner ring 1, as the core load-bearing component that directly mates with the wheel hub, is mainly used to transmit torque and various loads during wheel operation. Its structural design fully considers connection reliability and ease of assembly. One end of the inner ring 1 is fixedly connected to the wheel hub mounting ring 101 through a high-precision welding process. The end face of the wheel hub mounting ring 101 is surface ground to ensure the fitting accuracy with the wheel hub flange surface. Threaded holes are evenly opened along its circumference for a secure connection with the wheel hub flange surface using high-strength carbon steel bolts. The other end of the inner ring 1 is integrally machined to form a lead screw 103, on which a fastener 104 is threadedly connected. The fastener 104 adopts a hexagonal nut structure, which, after fitting with the end face of the inner ring 1, can effectively lock the axial position of the inner ring 1, preventing the inner ring 1 from moving axially due to vibration and impact during vehicle operation, thereby ensuring the operational stability of the entire bearing assembly.

[0028] like Figures 2 to 5 As shown, the outer circumference of the inner ring 1 is formed by precision turning and grinding to form two key annular structures, namely the inner rail groove 102 and the sealing groove 5. The cross-sectional profile of the inner rail groove 102 is highly matched with the surface profile of the rolling element 402 of the wheel hub bearing 4, which can effectively disperse the radial and axial loads transmitted by the rolling element 402, reduce contact stress, and extend the service life of the rolling element 402. The sealing groove 5 is located on the side of the inner rail groove 102 near the wheel hub mounting ring 101. Its groove width and groove depth are precisely designed according to the structural parameters of the sealing assembly 6. The inner wall of the groove is deburred and polished to avoid sharp edges scratching the sealing assembly 6, and to provide a stable installation space and a fitting base for the sealing assembly 6.

[0029] like Figures 2 to 6 As shown, the outer ring 2, as a fixed load-bearing component that cooperates with the frame, works in conjunction with the inner ring 1 to achieve the overall support function of the bearing. Its structural design takes into account both load-bearing strength and assembly compatibility. On the side of the outer ring 2 facing the sealing assembly 6, an annular limiting lip 8 is machined around it for positioning the airbag ring 7. The inner circumferential surface of the outer ring 2 has an outer rail groove 202 corresponding to the inner rail groove 102 of the inner ring 1. The machining process and precision requirements of the outer rail groove 202 are the same as those of the inner rail groove 102. A wheel hub bearing 4 is installed within the annular space formed by the inner rail groove 102 and the outer rail groove 202, allowing the inner ring 1 and outer ring 2 to rotate smoothly and flexibly relative to each other through the wheel hub bearing 4. One end of the outer ring 2 is integrally forged to form a frame mounting ring 201. The end face of 01 is surface ground and has several threaded holes evenly opened along its circumference for fixed connection with the frame steering knuckle by high-strength bolts. The end face of the frame mounting ring 201 is detachably mounted with a sensor mounting cover 3 by screws. The sensor mounting cover 3 is injection molded from engineering plastic and has a reserved mounting cavity inside that is compatible with components such as ABS sensors and temperature sensors. The inner wall of the mounting cavity is provided with a buffer rubber pad, which can provide all-round protection for the sensor from dust, water and vibration. At the same time, the detachable design facilitates the later inspection, calibration and replacement of the sensor, reducing the difficulty of maintenance.

[0030] like Figures 2 to 4As shown, the hub bearing 4, as the core moving component realizing the relative rotation between the inner ring 1 and the outer ring 2, adopts a double-row angular contact ball bearing structure, which has the characteristics of high load-bearing capacity and low operating resistance. It includes several rolling elements 402 and a cage 401. The cage 401 is injection molded from phenolic resin or engineering plastic material, and has pockets corresponding to the rolling elements 402. The inner wall of the pocket is machined with an arc-shaped guide surface. The radius of curvature of the arc-shaped guide surface is adapted to the outer diameter of the rolling element 402, which can reduce the frictional resistance between the rolling element 402 and the cage 401 during operation, reduce operating noise, and prevent the rolling element 402 from moving or jamming during high-speed operation, thus ensuring smooth operation of the bearing.

[0031] like Figures 4 to 6 As shown, the sealing assembly 6 is a key structure for realizing the core sealing function of the bearing. It is installed in the sealing groove 5 of the inner ring 1 and consists of an annular sealing frame 601 and an annular sealing lip 602. The two work together to form a basic sealing barrier. The annular sealing frame 601 is made of stainless steel through an integral stamping process. After stamping, the product undergoes shaping and deburring, giving it good structural rigidity and dimensional accuracy. It can effectively resist the radial vibration and axial movement generated during bearing operation, providing a stable support reference for the annular sealing lip 602. This avoids the misalignment of the lip and sealing surface caused by deformation under stress, which would lead to sealing failure, as is common in traditional sealing frames. The annular sealing frame 601 has an annular groove for mating with the annular sealing lip 602. The surface of the annular groove is knurled to form anti-slip teeth. The tooth height and tooth pitch of the anti-slip teeth are optimized to enhance the connection stability between the annular sealing frame 601 and the annular sealing lip 602, preventing relative rotation or axial separation between the two. The annular sealing lip 602 is made of oil-resistant and aging-resistant fluororubber material through a vulcanization molding process. Fluororubber material possesses excellent oil resistance, high and low temperature resistance, and anti-aging properties, enabling it to adapt to temperature changes and grease corrosion during bearing operation. The inner circumference of the annular sealing lip 602 has protruding ridges that match the anti-slip teeth, and it is firmly fixed to the annular sealing frame 601 through a snap-fit ​​method. After assembly, the protruding ridges and anti-slip teeth mesh tightly, further improving connection reliability. The annular sealing lip 602 adopts a multi-lip structure, with the outer circumference of each lip forming an interference fit with the inner wall of the sealing groove 5. Simultaneously, the top of the annular sealing lip 602 closely abuts against the inner end face of the outer ring 2, forming multiple sealing barriers that effectively prevent the intrusion of external impurities such as mud, dust, and sand, while also preventing leakage of internal bearing grease. A guide slope is provided on the side of the annular sealing lip 602 away from the annular sealing frame 601, facilitating the smooth insertion of the sealing component 6 into the sealing groove 5 during assembly, preventing lip damage due to excessive force during installation, and improving assembly efficiency and quality.

[0032] like Figures 4 to 5The airbag ring 7 shown is a sealing and reinforcing component made of hydrogenated nitrile rubber. Hydrogenated nitrile rubber has good elastic recovery, oil resistance, aging resistance and wear resistance, and can adapt to the grease environment inside the bearing and the friction conditions of long-term operation. The cross-section of the airbag ring 7 is circular or elliptical. Its dimensions are precisely designed according to the installation space between the annular sealing frame 601 and the limiting lip 8. It is embedded between the limiting lip 8 of the outer ring 2 and the annular sealing frame 601. One side of it is in close contact with the arc-shaped mating surface of the annular sealing frame 601 to achieve bidirectional positioning. The airbag ring 7 is equipped with a one-way valve inflation nozzle. The inflation nozzle adopts an embedded design to avoid damage from collisions during assembly or operation. The initial inflation pressure of the airbag ring 7 is set to 0.2MPa, and the working pressure range is controlled between 0.1-0.3MPa. This ensures that sufficient contact thrust is provided for the sealing component 6 without causing excessive compression and aging of the annular sealing lip 602 due to excessive pressure. The airbag ring 7 continuously applies axial thrust to the sealing component 6 through gas pressure to ensure that the annular sealing lip 602 and the sealing surface always maintain a stable contact force, thereby enhancing the sealing effect.

[0033] Example 2 Based on the above embodiment one, the present invention can be adaptively adjusted according to different usage scenarios and working conditions to further improve the environmental adaptability and service life of the product.

[0034] Specifically, for high-temperature environments, such as desert areas, bearing applications near engine compartments, or long-term high-temperature operation conditions, the annular sealing lip 602 can be replaced with perfluoroether rubber. Perfluoroether rubber has superior high-temperature resistance and chemical stability, effectively resisting aging and performance degradation under high-temperature conditions. At the same time, the initial inflation pressure of the airbag ring 7 is adjusted to 0.15MPa to avoid excessive expansion of the gas inside the airbag ring 7 under high-temperature conditions, which would lead to excessive pressure and thus prevent the annular sealing lip 602 from permanent deformation due to excessive compression.

[0035] For heavy-duty vehicles, such as heavy trucks and construction machinery vehicles, the annular seal 601 can be made of titanium alloy or high-strength aluminum alloy. Titanium alloy and high-strength aluminum alloy have higher structural rigidity and deformation resistance, which can withstand greater vibration and impact loads under heavy-duty conditions, providing more stable support for the annular seal lip 602. At the same time, lightweight materials can also reduce the overall weight of the bearing assembly to a certain extent and improve the vehicle's fuel economy.

[0036] For low-temperature environments, the annular sealing lip 602 can be replaced with silicone rubber. Silicone rubber has better low-temperature elasticity and can maintain good flexibility in low-temperature environments, avoiding the lip from hardening due to low temperatures and thus reducing sealing performance. At the same time, the initial inflation pressure of the airbag ring 7 can be adjusted to 0.25MPa. By increasing the initial pressure, the thrust attenuation caused by gas contraction in low-temperature environments is compensated, ensuring the fit of the sealing component 6.

[0037] Example 3 Based on the above embodiment one, to further optimize the performance of the airbag ring 7 and extend its service life, lithium-based grease needs to be applied to the contact surfaces of the airbag ring 7 and the limiting lip 8 of the outer ring 2, as well as the contact surfaces of the airbag ring 7 and the annular seal frame 601. This lithium-based grease is consistent with the type of grease used inside the bearing and has good compatibility and lubrication performance. After applying the grease, the frictional loss between the airbag ring 7 and the contacting parts during bearing operation can be effectively reduced, the wear rate can be reduced, and it can also play an auxiliary sealing role, further preventing impurities from entering the installation gap of the airbag ring 7, and ensuring the long-term stable performance of the sealing and strengthening function of the airbag ring 7.

[0038] The assembly process and working procedure of this invention are as follows: Before assembly, the specifications of each component are checked according to the vehicle model requirements to ensure that the dimensions of the inner ring 1 and outer ring 2 match the wheel hub and frame. Then, the assembly of the core components begins. First, the retainer 401 is fitted into the inner rail groove 102 of the inner ring 1, and the rolling elements 402 are installed in sequence, ensuring that each rolling element 402 falls completely into the pocket of the retainer 401. Lithium-based grease is applied between the inner rail groove 102 and the outer rail groove 202 to facilitate the subsequent slow pressing of the outer ring 2 into the inner ring 1. When slowly pressing the outer ring 2 into the inner ring 1, the sealing component 6 and the airbag ring 7 need to be installed in sequence first. The annular sealing lip 602 is first heated to 80°C to soften it, and then quickly fitted into the annular protrusion of the annular sealing bracket 601. After cooling to room temperature, the annular seal... The convex ridge of the sealing lip 602 tightly engages with the anti-slip teeth of the annular groove. The assembled sealing component 6 is aligned with the sealing groove 5 of the inner ring 1 and pushed in along the guide slope of the annular sealing lip 602. Then, the airbag ring 7 is embedded into one side of the annular sealing frame 601. Using a special inflation tool, it is inflated to 0.2MPa through the inflation nozzle. After closing the one-way valve, lithium-based grease is applied to the airbag ring 7. Then, the outer ring 2 is aligned with the inner ring 1 and slowly pressed in until the top of the annular sealing frame 601 abuts against the inner end face of the outer ring 2. Finally, the fixing part 104 is screwed into the screw 103 of the inner ring 1 and anti-loosening adhesive is applied to the thread surface. The sensor mounting cover 3 is fixed to the frame mounting ring 201 of the outer ring 2 with countersunk screws, completing the assembly of the entire wheel hub bearing assembly.

[0039] After the device is put into use, the working logic of the sealing system is based on layered protection and pressure replenishment. Through the synergistic effect of the sealing component 6 and the airbag ring 7, it achieves full-scenario sealing coverage from static to dynamic. In the stages of airbag ring 7 not being inflated, temporary depressurization, or initial assembly, the sealing component 6 can independently build a reliable sealing barrier. The annular sealing frame 601 is made of rigid metal materials such as stainless steel. Its one-piece molded structure can resist radial vibration and axial movement during bearing operation, providing a stable support reference for the annular sealing lip 602. This avoids the misalignment of the lip and sealing surface caused by deformation under stress in traditional sealing skeletons. The annular sealing lip 602 forms a double tight contact with the inner wall of the sealing groove 5 and the inner end face of the outer ring 2. The main lip of the multi-lip structure fits the inner wall of the sealing groove 5 with an interference fit, directly blocking the intrusion path of external mud, water, dust and other impurities. The other secondary lips form secondary protection with an interference fit, while preventing the internal lubricating grease of the bearing from leaking outward due to centrifugal force. This combination of rigid support and elastic fit enables the basic seal to achieve excellent protection standards, meeting the basic sealing requirements of practical vehicles.

[0040] When the airbag ring 7 is inflated to a preset pressure of 0.1-0.3 MPa, the sealing system enters a reinforced working state. The airbag ring 7 is embedded between the annular sealing frame 601 and the limiting lip 8. The arc-shaped structure on the limiting lip 8 is adapted to one side of the outer circumference of the airbag ring 7, working in conjunction with the annular sealing frame 601. This prevents the airbag ring 7 from shifting due to vehicle vibration and ensures that its pressure can be evenly transmitted to the annular sealing frame 601. The airbag ring 7 continuously applies axial thrust through the tight contact between one side and the annular sealing frame 601, increasing the contact pressure between the annular sealing lip 602 and the sealing surface. The pressure compensation is improved by reducing the micro-gap between the compression lip and the sealing surface. Crucially, this pressure compensation has the ability to adapt to different operating conditions. During vehicle operation, the bearing heats up due to friction, causing the gas inside the airbag ring 7 to expand due to heat, increasing the pressure and thrust. This counteracts the sealing relaxation caused by the softening of the annular sealing lip 602 due to thermal expansion. When the vehicle is in a low-temperature environment, the gas in the airbag ring 7 contracts, but its elastic recovery force can maintain the basic thrust, making up for the gap formed by the hardening and shrinkage of the lip at low temperatures, thus achieving stable sealing performance under temperature fluctuations.

[0041] The snap-fit ​​structure between the annular seal frame 601 and the annular seal lip 602 further enhances the sealing reliability. The annular groove on the annular seal frame 601 engages with the concave ridge on the inner circumference of the lip through anti-slip teeth. This connection method can effectively resist relative displacement caused by vibration, ensuring that the lip always maintains a close fit with the sealing surface. At the same time, the guide slope on the side of the annular seal lip 602 away from the annular seal frame 601 not only facilitates assembly but also further enhances the sealing effect when the bearing is running, ensuring the sealing performance.

[0042] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A hub bearing assembly, characterized in that, It includes an inner ring (1) for mating with the wheel hub, an outer ring (2) for mating with the frame, and a sealing assembly (6) and an airbag ring (7) for achieving a sealing function. A sealing groove (5) is provided around the outer circumference of the inner ring (1), and a limiting lip (8) is provided around one side of the outer ring (2). The sealing assembly (6) includes an annular sealing frame (601) and an annular sealing lip (602). The annular sealing frame (601) and the annular sealing lip (602) are snapped together and fixed. The outer periphery of the annular sealing lip (602) is in close contact with the inner wall of the sealing groove (5) and the inner end face of the outer ring (2). This mating structure alone can achieve basic sealing. The airbag ring (7) is embedded in one side of the annular sealing frame (601), and one side of the airbag ring (7) abuts against the limiting lip (8) of the outer ring (2). The airbag ring (7) is filled with gas at a preset pressure, so that the annular sealing lip (602) is kept in close contact with the inner wall of the sealing groove (5) and the inner end face of the outer ring (2) by pushing the annular sealing frame (601) through the gas pressure, thereby further enhancing the sealing effect.

2. The wheel hub bearing assembly according to claim 1, characterized in that, The outer circumferential surface of the inner ring (1) is also surrounded by an inner rail groove (102), and the inner circumferential surface of the outer ring (2) is surrounded by an outer rail groove (202) corresponding to the inner rail groove (102). A hub bearing (4) is provided in the space formed by the inner rail groove (102) and the outer rail groove (202), so that the inner ring (1) and the outer ring (2) can be rotatably engaged through the hub bearing (4). The sealing groove (5) is located on one side of the inner rail groove (102).

3. The wheel hub bearing assembly according to claim 2, characterized in that, The top of the annular sealing frame (601) is positioned by contacting the inner end face of the outer ring (2) to achieve axial positioning of the sealing assembly (6).

4. The wheel hub bearing assembly according to claim 3, characterized in that, The annular sealing lip (602) adopts a multi-lip structure, and the outer periphery of each lip is interference-fitted with the inner wall of the sealing groove (5).

5. The wheel hub bearing assembly according to claim 4, characterized in that, The annular sealing lip (602) has a guide slope on the side away from the annular sealing frame (601). The guide slope is inclined toward the groove of the sealing groove (5) to facilitate the installation of the sealing assembly (6).

6. The wheel hub bearing assembly according to claim 1, characterized in that, The annular sealing frame (601) is integrally formed from a metal material, which is one of stainless steel, aluminum alloy or titanium alloy, to ensure the structural rigidity of the sealing assembly (6).

7. The wheel hub bearing assembly according to claim 6, characterized in that, The annular sealing frame (601) is provided with an annular groove for engaging with the annular sealing lip (602). The surface of the annular groove is provided with anti-slip teeth. The inner circumference of the annular sealing lip (602) is provided with a raised ridge that matches the anti-slip teeth, so as to enhance the connection stability between the annular sealing frame (601) and the annular sealing lip (602).

8. The wheel hub bearing assembly according to claim 2, characterized in that, The hub bearing (4) includes a plurality of rolling elements (402) and a retainer (401) for constraining the rolling elements (402). The retainer (401) has pockets corresponding to the rolling elements (402) one by one. The inner wall of the pockets is provided with an arc-shaped guide surface to reduce the frictional resistance (402) of the rolling elements during operation.

9. The wheel hub bearing assembly according to claim 8, characterized in that, One end of the inner ring (1) is fixedly provided with a hub mounting ring (101), and the hub mounting ring (101) is provided with a plurality of threaded holes for connecting the hub evenly along the circumferential direction. The other end of the inner ring (1) is provided with a lead screw (103), and a fastener (104) for locking the axial position of the inner ring (1) is threaded onto the lead screw (103).

10. The wheel hub bearing assembly according to claim 1, characterized in that, One end of the outer ring (2) is fixedly provided with a frame mounting ring (201). The frame mounting ring (201) is provided with a plurality of threaded holes for connecting the frame evenly along the circumference. A sensor mounting cover (3) for protecting the sensor is detachably installed on the frame mounting ring (201).

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