Unit case type seal structure for hub bearing and hub bearing unit

Abstract

The application discloses a unit box type sealing structure for a hub bearing and a hub bearing unit, and is applied to the field of hub bearing production, and comprises the unit box type sealing structure, the unit box type sealing structure comprises an outer frame assembly, an inner frame assembly and a spring assembly, the outer frame assembly comprises an outer frame one and an outer frame two, an inner frame one is in interference fit on the inner side of the outer frame one, the inner frame one completely covers the inner surface of the outer frame one, the outer frame two comprises a straight line structure and a curved structure, the curved structure is located on the inner side of the inner frame one, an inner frame two is in interference fit on one side of the outer frame two, an inner frame three is in interference fit on a section of the inner frame one, an oil blocking channel a is formed between the outer frame two and the inner frame three, and a mud blocking channel b is formed between the outer frame two and the inner frame one, and the application has the characteristics of improving the mud blocking performance of the sealing structure.

Description

Technical Field

[0001] This invention relates to the field of wheel hub bearing manufacturing technology, specifically to a unit box-type sealing structure for wheel hub bearings and a wheel hub bearing unit. Background Technology

[0002] The wheel hub is a component that bears and supports the weight of the entire vehicle, ensuring stable driving. The wheel hub bearing unit is a precision core component installed between the axle and the wheel hub. The wheel hub bearing unit includes the wheel hub bearing and the sealing structure, providing rotational support for the wheel hub, bearing loads and transmitting torque. The sealing structure is the core protective component at the connection between the wheel hub bearing and the axle, protecting the wheel hub bearing to work properly.

[0003] The wheel hub bearing is filled with lubricating oil to reduce rolling friction and prevent dry friction. The sealing structure prevents lubricating oil from leaking out of the gap, ensuring that the bearing is always in a good lubricated state. During vehicle operation, dust, mud and other foreign objects on the road will constantly come into contact with the wheel. The sealing structure can effectively prevent impurities from entering and avoid scratching the precision structure of the bearing.

[0004] Currently, the sealing performance requirements for sealing structures are high. In the production process of wheel hub bearing units, the sealing structure is often tested independently. However, with the development of technology, the complexity of sealing structures has gradually increased, and independent testing of sealing structures cannot meet production needs. Therefore, it is essential to further test the sealing performance in the production process of wheel hub bearing units. Summary of the Invention

[0005] The purpose of this invention is to provide a unit box-type sealing structure and a wheel hub bearing unit for wheel hub bearings, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a unit box-type sealing structure for wheel hub bearings, including an outer skeleton assembly, an inner skeleton assembly, and a spring assembly. The outer skeleton assembly includes an outer skeleton one and an outer skeleton two. The inner skeleton one is interference-fitted to the inner side of the outer skeleton one, and the inner skeleton one completely covers the inner surface of the outer skeleton one. The outer skeleton two includes a straight structure and a curved structure. The outer side of the straight structure is provided with a plurality of anti-slip ribs two. The curved structure is located inside the inner skeleton one. The outer frame 2 is interference-fitted with the inner frame 2 on the side away from the anti-slip rib 2, and one end of the inner frame 1 is fixed with the inner frame 3 by a flange. The outer skeleton two and the inner skeleton three form an oil-blocking channel a, and the outer skeleton two and the inner skeleton one form a mud-blocking channel b.

[0007] According to the above technical solution, the curved structure is equipped with sealing lip one and sealing lip two on one side of the oil blocking channel a. Sealing lip one is interference-fitted with inner skeleton one, and sealing lip two is interference-fitted with inner skeleton three.

[0008] According to the above technical solution, the curved structure is equipped with sealing lips three, four and five on one side of the mud-blocking channel b. Sealing lips three, four and five are all interference fit with the inner skeleton one. Sealing lip six is ​​installed on the outer skeleton one near the opening end of the mud-blocking channel b. Sealing lip six contacts the straight structure of the outer skeleton one to close the opening end of the mud-blocking channel b.

[0009] According to the above technical solution, a spring groove is provided on the side of the sealing lip one away from the inner skeleton one, and a spring groove is provided on the side of the sealing lip three away from the inner skeleton one. The spring assembly includes a spring one and a spring two. The spring one is installed inside the spring groove one, and the spring two is installed inside the spring groove two. The sealing lip one is the main sealing lip.

[0010] According to the above technical solution, a plurality of anti-slip ribs are provided on one side of the outer frame, and a gasket is provided near the opening end of the mud-blocking channel b. The curved structure is provided with sealing rib one and sealing rib two in sequence on the side of the smaller channel inside the mud-blocking channel b.

[0011] Based on the above technical solution, the following usage methods are included: S1: Assembly unit box-type sealed structure; S2: Sampling test of the sealing performance of the unit box-type sealing structure; S3: Assemble the wheel hub bearing unit and perform dynamic testing on the wheel hub bearing unit.

[0012] According to the above technical solution, S1 includes the following usage methods: The structural dimensions of each component of the unit box-type sealing structure are inspected, and the unit box-type sealing structure is assembled through a press-fitting process.

[0013] According to the above technical solution, S2 includes the following usage methods: The assembled unit box-type sealing structure was sampled to test the sealing performance of the oil blocking channel a and the mud blocking channel b.

[0014] According to the above technical solution, S3 includes the following usage methods: The unit box seal structure and the hub bearing unit were assembled to simulate the actual working state of the unit box seal structure and to test the sealing performance of the unit box seal structure under real working conditions.

[0015] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a wheel hub bearing unit, including a wheel hub bearing, the wheel hub bearing including a fixed outer ring and a rotating inner ring, the fixed outer ring having a shoulder, the rotating inner ring being fixedly connected to an axle, including the unit box sealing structure for the wheel hub bearing in the above technical solution, wherein the unit box sealing structure for the wheel hub bearing is used to seal the wheel hub bearing and the axle.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention, by setting an outer skeleton assembly and an inner skeleton assembly, constitutes an oil blocking channel a and a mud blocking channel b, further improving the sealing performance of the unit box-type sealing structure; by setting a spring assembly, the radial contact force of the sealing lip on the skeleton is strengthened, further improving the sealing performance. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the unit box-type sealing structure of the present invention; Figure 3 This is the present invention. Figure 2 Schematic diagram of area A; Figure 4 This is a schematic diagram of the second structure of the exoskeleton of the present invention; Figure 5 This is a test schematic diagram of the unit box-type sealing structure of the present invention; Figure 6 This is a schematic diagram of the process flow of the present invention; In the diagram: 1. Outer frame one; 2. Outer frame two; 201. Straight structure; 202. Bending structure; 3. Anti-slip rib one; 4. Anti-slip rib two; 5. Inner frame one; 6. Inner frame two; 7. Inner frame three; 8. Sealing lip one; 9. Sealing lip two; 10. Sealing lip three; 11. Sealing lip four; 12. Sealing lip five; 13. Sealing lip six; 14. Gasket; 15. Sealing rib one; 16. Sealing rib two; 17. Spring groove one; 18. Spring groove two; 19. Spring one; 20. Spring two; 21. Wheel hub bearing; 22. Fixed outer ring; 23. Rotating inner ring; 24. Axle shoulder; 25. Axle. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described 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.

[0019] Example 1: Please refer to Figure 1 The present invention provides a technical solution: a unit box-type sealing structure for wheel hub bearings and a wheel hub bearing unit. The wheel hub bearing unit includes a wheel hub bearing 21, which includes a fixed outer ring 22 and a rotating inner ring 23. The fixed outer ring 22 is fixedly connected to the vehicle body and has a shoulder 24. The rotating inner ring 23 is fixedly connected to an axle 25. The unit box-type sealing structure is disposed between the shoulder 24 and the axle 25. The unit box-type sealing structure is interference-fitted with the fixed outer ring 22 and fits against the axle body of the axle 25.

[0020] Please see Figure 2 The unit box-type sealing structure includes an outer frame assembly, an inner frame assembly, and a spring assembly. The outer frame assembly includes outer frame one 1 and outer frame two 2 (e.g., Figure 4 As shown), the outer frame 1 fits into the axle body of the axle 25, and the outer frame 2 is interference-fitted with the fixed outer ring 22.

[0021] Several anti-slip ribs 3 are provided on the surface of the outer frame 1 that is in contact with the axle 25 to prevent the unit box-type sealing structure from rotating along with the axle 25.

[0022] The inner side of the outer frame 1 is press-fitted with the inner frame 5, which completely covers the inner surface of the outer frame 1. The outer frame 2 includes a straight structure 201 and a curved structure 202. The outer side of the straight structure 201 is press-fitted with the shoulder 24, and several anti-slip ribs 24 are provided on the surface of the straight structure 201 that is fitted with the shoulder 24. The curved structure 202 is located inside the inner frame 5.

[0023] The outer frame 2 is interference-fitted with the inner frame 6 on the side away from the anti-slip rib 2 4. One end of the inner frame 5 is flanged and fixed with the inner frame 3 7. The inner frame 3 7 is used to prevent the outer frame 2 2 and the inner frame 2 6 from being dislodged under force when the heavy truck drive axle is under high load and strong vibration, and to enhance the assembly stability of the sealing structure to meet the long-term heavy-load driving needs of heavy trucks.

[0024] The outer skeleton 2 and the inner skeleton 3 form an oil blocking channel a. The curved structure 202 is located on one side of the oil blocking channel a and is equipped with sealing lip 1 8 and sealing lip 2 9. Sealing lip 1 8 is interference-fitted with inner skeleton 1 5, and sealing lip 2 9 is interference-fitted with inner skeleton 3 7. Sealing lip 2 9 is used to intercept solid impurities in liquid oil and only allows a small amount of liquid oil to slowly seep into sealing lip 1 8. Sealing lip 1 8 plays the main sealing role for liquid oil.

[0025] The outer skeleton 2 and the inner skeleton 5 form a mud-blocking channel b. The curved structure 202 is located on one side of the mud-blocking channel b and is equipped with sealing lips 3 10, 4 11 and 5 12. Sealing lips 3 10, 4 11 and 5 12 are all interference fit with the inner skeleton 5. The outer skeleton 1 is equipped with sealing lip 6 13 near the opening end of the mud-blocking channel b. Sealing lip 6 13 contacts the straight structure 201 of the outer skeleton 1 and closes the opening end of the mud-blocking channel b.

[0026] A gasket 14 is installed near the opening of the mud-blocking channel b. Each set of inner skeletons is made of SAPH440 material, each set of outer skeletons is made of FKM material, each set of sealing lips and sealing ribs is made of FKM material, and the gasket 14 is made of PTFE material. During the pressing process of outer skeleton 2 and inner skeleton 5, the gasket 14 is used to provide cushioning and limit the displacement of inner skeleton 5, so as to prevent the SAPH440 inner skeleton 5 from deforming and failing due to excessive compression during pressing.

[0027] Please see Figure 3 The curved structure 202 is located on the side of the smaller channel inside the mud-blocking channel b, and sealing ribs 15 and 16 are sequentially provided to block the penetration of solid foreign objects in the mud and water. The oil-blocking channel a and the mud-blocking channel b are connected, and each set of sealing lips and sealing ribs sequentially separates the interior of the oil-blocking channel a and the mud-blocking channel b.

[0028] Please see Figure 4 A spring groove 17 is provided on the side of the sealing lip 18 away from the inner skeleton 15, and a spring groove 28 is provided on the side of the sealing lip 3 10 away from the inner skeleton 15. The spring assembly includes a spring 19 and a spring 20. The spring 19 is installed inside the spring groove 17, and the spring 20 is installed inside the spring groove 28. The sealing lip 18 is the main sealing lip. The spring 19 provides and maintains the radial contact force of the main sealing lip on the skeleton surface, compensates for the wear of the lip, and ensures a long-term stable sealing effect. The spring 20 provides and maintains the radial contact force of the sealing lip 3 10 on the skeleton surface.

[0029] Example 2: The present invention provides a technical solution: a unit box-type sealing structure for wheel hub bearings and a wheel hub bearing unit, including the following usage method, the specific steps of which are as follows: S1: Assembly unit box-type sealed structure.

[0030] S2: Sampling test on the sealing performance of the unit box-type sealing structure.

[0031] S3: Assemble the wheel hub bearing unit and perform dynamic testing on the wheel hub bearing unit.

[0032] The unit-type box seal structure for wheel hub bearings and the method of using the wheel hub bearing unit, S1 includes the following steps: The structural dimensions of each component of the unit box-type sealing structure are inspected, and the unit box-type sealing structure is assembled through a press-fitting process.

[0033] Specifically, since the hub bearing 21 is a precision instrument, the precision requirements for the components related to the unit box seal structure are high. A visual measuring instrument is used to inspect the structural dimensions of the outer frame assembly, inner frame assembly, and spring assembly. The inspection principle is based on existing technology. Since the outer frame assembly and inner frame assembly are both stamped parts, when any frame structure dimension is found to exceed the allowable error range, the unqualified part should be scrapped. The inspection principle of the spring assembly is the same as that of the frame assembly. If multiple parts are found to have unqualified dimensions, it indicates a fault in the production process of the parts, and the production process should be investigated for faults.

[0034] Furthermore, the unit box-type sealing structure is assembled using press-fitting equipment, and the press-fitting principle is an existing technology.

[0035] The unit-type box seal structure for wheel hub bearings and the method of using the wheel hub bearing unit, S2 includes the following steps: The assembled unit box-type sealing structure was sampled to test the sealing performance of the oil blocking channel a and the mud blocking channel b.

[0036] The assembled unit box-type sealing structure is sampled and the sample is installed on the testing device, which includes a data processing module, a fixed platform, a rotating platform and various sensors. By simulating the static state of the vehicle, the sealing performance of the oil blocking channel a and the mud blocking channel b is tested.

[0037] The unit box seal structure is fixedly installed on a fixed platform to simulate the installation of the unit box seal structure in the wheel hub bearing unit (e.g., Figure 5 (As shown).

[0038] The testing device injects lubricating oil at a preset pressure near the opening of the oil blocking channel a. The preset oil pressure of the lubricating oil is consistent with the wheel hub oil pressure when the vehicle is stationary. A vision sensor is set on one side near the opening of the mud blocking channel b. The vision sensor detects whether there is lubricating oil on one side of the opening of the mud blocking channel b and transmits the corresponding signal to the data processing module to determine the leakage situation. During the detection process, the oil pressure of the lubricating oil is kept stable, and the total detection time is defined as T.

[0039] Ideally, if the visual sensor detects no leakage, it indicates that the sealing performance of the sealing structure is qualified when it is stationary.

[0040] When the vision sensor detects lubricating oil leakage, it makes a further judgment on the cause of leakage in the sealing structure based on the amount and duration of the leakage. T is divided into n time periods, where Ti represents the nth time period and i is an integer between 1 and n.

[0041] Scenario 1: When the vision sensor detects leakage at Ti, and continues to detect lubricating oil leakage during the time period from Ti to Tn, with no significant fluctuation in the leakage amount at different time periods, it indicates that there is a defect in the components of the unit box-type sealing structure itself, such as scratches or dents on the sealing lip surface, or insufficient elasticity of the spring assembly, which leads to the formation of a stable leakage channel inside the sealing structure. Multiple sets of samples should be further selected for testing. If the remaining samples pass the test, it indicates that the fault is caused by production error. If multiple sets of the remaining samples fail the test, it indicates that there is a fault in the production process, and the fault in the production process should be investigated.

[0042] Scenario 2: When the vision sensor detects leakage at Ti, irregular fluctuations in the amount of lubricating oil leakage are detected during the time period from Ti to Tn. This indicates that there are slight assembly gaps between the inner skeleton assembly, outer skeleton assembly, and spring assembly during press-fitting. Trace impurities in the lubricating oil clog these gaps, causing the leakage to decrease. As the detection time increases, some of the clogged particles are washed away by the lubricating oil, resulting in an increase in leakage. The press-fitting process between each group of components should be optimized.

[0043] Furthermore, since mud and water splash onto the sealing structure during actual vehicle operation, high-pressure mud and water are sprayed near the opening of the mud-blocking channel b to simulate mud and water splashing and test the sealing performance of the sealing structure against mud and water. The testing principle is the same as that for lubricating oil.

[0044] The unit-type box seal structure for wheel hub bearings and the method of using the wheel hub bearing unit, S3 includes the following steps: The unit box seal structure and the hub bearing unit were assembled to simulate the actual working state of the unit box seal structure and to test the sealing performance of the unit box seal structure under real working conditions.

[0045] Specifically, S3.1: Install the hub bearing 21 on the rotating platform, and sleeve the qualified sealing structure detected in S2 onto the press-fitting tooling.

[0046] S3.2: The press-fitting tooling coaxially presses the sealing structure into the shoulder 24 of the hub bearing 21.

[0047] S3.3: Withdraw the press-fitting tooling and insert the axle 25 into the hub bearing 21.

[0048] S3.4: Conduct a dynamic test on the installed hub bearing unit.

[0049] During the driving process of the vehicle, the axle 25 rotates. To ensure the sealing performance of the unit box-type sealing structure, the sealing structure should remain stationary. If the sealing structure rotates with the axle 25, under the action of centrifugal force and torsional force, the contact pressure between the sealing structure and the axle 25 will be uneven, directly leading to seal failure.

[0050] Therefore, an angle sensor and a vibration sensor are installed on the outer frame 1. The angle sensor is used to collect the real-time rotation angle of the sealing structure, and the vibration sensor is used to collect the radial and axial amplitude data of the sealing structure.

[0051] Set the detection point of the angle sensor in the initial state as the reference point. When the axle 25 rotates, the sealing structure will be simultaneously subjected to radial force and axial force. The radial force comes from the radial load of the axle 25, and the axial force comes from the positioning extrusion and vibration impact between the shoulder 24 and the axle 25. Therefore, it is necessary to comprehensively detect the amplitudes in the radial and axial directions. Define the maximum allowable deviation angle as θ0, the maximum allowable radial amplitude as A1, and the maximum axial amplitude as A2.

[0052] Use the rotating platform to rotate the axle 25, and simulate the acceleration stage, constant-speed stage, and deceleration stage of the vehicle by controlling the rotation speed of the axle 25. The detection time for each stage is the same.

[0053] The angle sensor transmits the detected offset angle data θ1 to the data processing module, and the amplitude sensor transmits the detected radial amplitude A_rad and axial amplitude A_ax to the data processing module, and comprehensively analyzes each group of data.

[0054] During the overall detection stage, when the data processing module obtains θ1 < θ0, A_ax < A2, and A_rad < A1, it indicates that the rotation angle and amplitude of the sealing structure in the rotating state are qualified, and it can enter the subsequent overall assembly process of the hub bearing unit.

[0055] In the overall detection stage, the data processing module obtains that θ1 > θ0, the A-axis < A2, and the A-diameter < A1, indicating that the sealing structure is deflected. If 1.5θ0 > θ1 > θ0, it indicates a slight deflection caused by insufficient pressing force. If θ1 > 1.5θ0, it indicates a coaxiality deviation between the sealing structure and the hub bearing 21 and the axle 25 during assembly, resulting in local gaps between the anti-slip rib one 3 and the anti-slip rib two 4 and the axle 25 and the shoulder 24 respectively, causing the sealing structure to deflect excessively, and the assembly process should be optimized.

[0056] In the overall detection stage, the data processing module obtains that θ1 < θ0, but there is at least any one set of detection results of the A-axis > A2 or the A-diameter > A1, indicating that there is a deviation in the installation of the sealing structure and the hub bearing 21 and the axle 25. Exemplarily, the height dimension deviation of the anti-slip rib one 3 causes an increase in the gap between the sealing structure and the axle 25, resulting in an increase in the radial amplitude and a coaxiality deviation between the sealing structure and the axle 25. At this time, the pressing process of the sealing structure should be detected. After excluding the installation problem, it indicates that there are processing defects in the sealing structure parts itself, and it is necessary to check whether there are faults in the relevant detection equipment of S1.

[0057] Since the detection times in the acceleration stage, the constant speed stage, and the deceleration stage are the same, the data processing module can determine in which working condition the seal failure occurs according to the occurrence time of any one set of detection results of θ1 > θ0, the A-axis > A2, and the A-diameter > A1, providing effective data support for optimizing the design and installation method of the unit box-type sealing structure.

[0058] Furthermore, the unit box-type sealing structure that passed the detection in S3 is retested in S2. If seal failure occurs, it indicates that there are defects in the sealing structure itself. After working for a period of time, the structural defects are magnified, resulting in seal failure, providing real reference data for optimizing the design of the unit box-type sealing structure and the selection of production materials.

[0059] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A unit-type box seal structure for wheel hub bearings, comprising an outer skeleton assembly, an inner skeleton assembly, and a spring assembly, characterized in that: The outer frame assembly includes an outer frame one (1) and an outer frame two (2). The inner frame one (5) is interference-fitted to the inner side of the outer frame one (1). The inner frame one (5) completely covers the inner surface of the outer frame one (1). The outer frame two (2) includes a straight structure (201) and a curved structure (202). Several anti-slip ribs two (4) are provided on the outer side of the straight structure (201). The curved structure (202) is located inside the inner frame one (5). The outer frame 2 (2) is interference-fitted with the inner frame 2 (6) on the side away from the anti-slip rib 2 (4), and the inner frame 3 (7) is fixed at one end of the inner frame 1 (5). The outer skeleton two (2) and the inner skeleton three (7) form an oil blocking channel a, and the outer skeleton two (2) and the inner skeleton one (5) form a mud blocking channel b.

2. The unit box-type sealing structure for wheel hub bearings according to claim 1, characterized in that: The curved structure (202) is equipped with a sealing lip one (8) and a sealing lip two (9) on one side of the oil blocking channel a. The sealing lip one (8) is press-fitted with the inner skeleton one (5), and the sealing lip two (9) is press-fitted with the inner skeleton three (7).

3. The unit box-type sealing structure for wheel hub bearings according to claim 2, characterized in that: The curved structure (202) is equipped with sealing lips three (10), four (11) and five (12) on one side of the mud-blocking channel b. The sealing lips three (10), four (11) and five (12) are all interference fit with the inner skeleton one (5). The outer skeleton one (1) is equipped with sealing lip six (13) near the opening end of the mud-blocking channel b. The sealing lip six (13) contacts the straight structure (201) of the outer skeleton one (1) to close the opening end of the mud-blocking channel b.

4. The unit box-type sealing structure for wheel hub bearings according to claim 3, characterized in that: The sealing lip one (8) has a spring groove one (17) on the side away from the inner skeleton one (5), and the sealing lip three (10) has a spring groove two (18) on the side away from the inner skeleton one (5). The spring assembly includes spring one (19) and spring two (20). Spring one (19) is installed inside the spring groove one (17), and spring two (20) is installed inside the spring groove two (18). The sealing lip one (8) is the main sealing lip.

5. The unit box-type sealing structure for wheel hub bearings according to claim 4, characterized in that: The outer frame (1) has several anti-slip ribs (3) on one side, and a gasket (14) is provided near the opening of the mud-blocking channel b. The curved structure (202) has sealing ribs (15) and sealing ribs (16) sequentially provided on the side of the smaller channel inside the mud-blocking channel b.

6. The unit box-type sealing structure for wheel hub bearings according to claim 5, characterized in that: Including the following usage methods: S1: Assembly unit box-type sealed structure; S2: Sampling tests are conducted on the sealing performance of the unit box-type sealing structure; S3: Assemble the wheel hub bearing unit and perform dynamic testing on the wheel hub bearing unit.

7. The unit box-type sealing structure for wheel hub bearings according to claim 6, characterized in that: The S1 includes the following usage methods: The structural dimensions of each component of the unit box-type sealing structure are inspected, and the unit box-type sealing structure is assembled through a press-fitting process.

8. The unit box-type sealing structure for wheel hub bearings according to claim 6, characterized in that: The S2 includes the following usage methods: The assembled unit box-type sealing structure was sampled to test the sealing performance of the oil blocking channel a and the mud blocking channel b.

9. The unit box-type sealing structure for wheel hub bearings according to claim 6, characterized in that: The S3 includes the following usage methods: The unit box seal structure and the hub bearing unit were assembled to simulate the actual working state of the unit box seal structure and to test the sealing performance of the unit box seal structure under real working conditions.

10. A hub bearing unit, comprising a hub bearing (21), the hub bearing (21) comprising a fixed outer ring (22) and a rotating inner ring (23), the fixed outer ring (22) having a shoulder (24), the rotating inner ring (23) being fixedly connected to an axle (25), characterized in that: Includes the unit box seal structure for wheel hub bearing as in claim 9, wherein the unit box seal structure for wheel hub bearing is used to seal the wheel hub bearing (21) and the axle (25).

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