A wheel hub bearing assembly method and wheel hub bearing

Abstract

The present invention relates to the technical field of wheel hub bearings, and more specifically, to a wheel hub bearing assembly method and a wheel hub bearing. The assembly method includes coating a sealing rubber ring on the inner ring unit based on the inner ring unit being positioned; controlling the inner sealing part to be positioned based on the sealing rubber ring coating being applied; controlling the inner sealing part to move toward the first flange and push the sealing rubber ring to flow along the outer surface of the inner ring of the bearing based on the inner sealing part being positioned until the second abutting ring abuts against the first flange; and assembling the outer sealing part, the rolling unit, the outer ring unit, and the second sealing unit with the inner ring unit, respectively, based on the second abutting ring abutting against the first flange. The inner sealing part on the wheel hub bearing can be firmly fixed on the inner ring unit by the above method, thus solving the problem of low reliability of the wheel hub bearing assembly method.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub bearings, and in particular to a wheel hub bearing assembly method and a wheel hub bearing. Background Art

[0002] The assembly of wheel hub bearings mainly refers to the assembly of the outer ring and the inner ring of the bearing through rollers, and in the gap between the rollers and the bearings, a sealing ring needs to be installed to prevent dust and other pollutants from invading. There are many forms of sealing rings. In order to improve the reliability and stability of the seal, double sealing rings are often used. Compared with single sealing rings, double sealing rings have stronger wear resistance, wider adaptability, and can withstand internal and external pressures at the same time to achieve a two-way sealing effect. In addition, in order to adapt to the high-speed rotation of the wheel hub bearing, a dynamic sealing ring is often used on the bearing. The dynamic sealing ring can remain relatively still with the rotating bearing during the rotation process, so that the sealing cavity continues to maintain a sealing effect and effectively prevents medium leakage.

[0003] The existing assembly method is to directly set the double sealing rings at the installation position, wherein one of the dynamic sealing rings is located at the position where the inner ring is connected to the flange, which makes it difficult to ensure accurate assembly accuracy, so that the sealing ring is easily deviated, causing the seal to fail. Summary of the invention

[0004] In order to solve the problem of low reliability of a wheel hub bearing assembly method, the present invention provides a wheel hub bearing assembly method and a wheel hub bearing.

[0005] In a first aspect, the present invention provides a wheel hub bearing assembly method, the wheel hub bearing assembly method comprising:

[0006] Step S10, based on the inner ring unit being positioned, coating a sealing rubber ring on the inner ring unit; the inner ring unit comprises a first flange and a bearing inner ring; the first flange is coaxial with the bearing inner ring and is integrally formed; the coating position of the sealing rubber ring is at the end of the bearing inner ring close to the first flange;

[0007] Step S20, based on the completion of coating of the sealing rubber ring, control the inner sealing part to be positioned; in the state where the inner sealing part is positioned, the inner sealing part is coaxially arranged with the inner ring unit; the inner sealing part comprises a first abutting ring, a connecting ring and a second abutting ring which are coaxial and integrally formed in sequence; the outer diameter of the first abutting ring is smaller than the inner diameter of the second abutting ring; there is an axial spacing between the first abutting ring and the second abutting ring;

[0008] Step S30, based on the completion of the positioning of the inner sealing part, control the inner sealing part to move toward the first flange and push the sealing rubber ring to flow along the outer surface of the bearing inner ring until the second abutting ring abuts against the first flange; when the sealing rubber ring flows, a sealing rubber film is formed on the remaining surface of the fitting surface between the first abutting ring and the bearing inner ring; when the second abutting ring abuts against the first flange, the bearing inner ring is inserted into the first abutting ring and the two are interference fit, and a closed accommodating cavity is formed between the connecting ring, the bearing inner ring and the first flange, and the sealing rubber ring is in a solidified state in the accommodating cavity near the first abutting ring; the coating position of the sealing rubber ring is located on the assembly path of the first abutting ring;

[0009] Step S40, based on the second abutment ring abutting against the first flange, the outer sealing part, the rolling unit, the outer ring unit, and the second sealing unit are respectively assembled with the inner ring unit; the outer sealing part is assembled at one end of the outer ring unit; the outer sealing part and the inner sealing part form a dynamic sealing structure; the second sealing unit is assembled at the end of the bearing inner ring away from the first flange; and the second sealing unit is assembled between the bearing inner ring and the outer ring unit; the second sealing unit is a dynamic sealing structure.

[0010] In some embodiments, the sealing rubber ring is an anaerobic sealant.

[0011] In some embodiments, when the inner ring unit is positioned, the inner ring unit is vertically arranged, and the first flange is located at the top of the inner ring of the bearing;

[0012] When the inner sealing portion is positioned, the inner sealing portion is located below the first flange, and the sealing rubber ring is located between the inner sealing portion and the first flange.

[0013] In some embodiments, when the inner sealing portion is positioned, the distance between the second abutment ring and the first flange is greater than the axial length of the first abutment ring.

[0014] In some embodiments, the step S10 further includes: coating the sealing rubber ring with a volume that satisfies the following formula:

[0015] 0.3 <V1:V2<0.5;

[0016] Wherein, V1 is the volume coated with the sealing rubber ring, and V2 is the volume of the accommodating cavity.

[0017] In some embodiments, the surface roughness of the side of the inner sealing portion abutting against the inner ring of the bearing is greater than the surface roughness of the side of the inner sealing portion facing the outer sealing portion.

[0018] In a second aspect, the present invention provides a wheel hub bearing, the wheel hub bearing being applied to the wheel hub bearing assembly method of any one of the first aspects, the wheel hub bearing comprising:

[0019] An inner ring unit, the inner ring unit comprising a first flange and a bearing inner ring; the first flange and the bearing inner ring are fixedly connected;

[0020] Rolling unit;

[0021] An outer ring unit, the outer ring unit comprising a bearing outer ring and a second flange; the bearing outer ring and the second flange are fixedly connected; the inner ring unit is rotationally connected to the outer ring unit via the rolling unit;

[0022] A first sealing unit, the first sealing unit comprises an outer sealing part and an inner sealing part; the inner sealing part is interference fit with the inner ring of the bearing; the outer sealing part cooperates with the inner sealing part to form a dynamic sealing structure; the inner sealing part comprises a first abutting ring, a connecting ring, a second abutting ring, a sealing rubber ring and a sealing rubber film; the first abutting ring abuts with the inner ring of the bearing, and the second abutting ring abuts with the first flange; the matching surface of the first abutting ring and the inner ring of the bearing has a sealing rubber film; there is an axial spacing between the first abutting ring and the second abutting ring; one end of the connecting ring is fixedly connected to the first abutting ring, and the other end is fixedly connected to the second abutting ring;

[0023] A second sealing unit; the second sealing unit is mounted at the end of the bearing inner ring away from the first flange; and the second sealing unit is mounted between the bearing inner ring and the outer ring unit; the second sealing unit is a dynamic sealing structure;

[0024] The accommodating chamber is a closed space surrounded by the connecting ring, the first flange and the inner ring of the bearing; the sealing rubber ring is located inside the accommodating chamber near the end of the first abutting ring.

[0025] In some embodiments, the connecting ring is a conical ring, and the taper of the connecting ring is 35°~50°.

[0026] In some embodiments, the inner sealing portion further includes a retaining ring; one end of the retaining ring is fixedly connected to an end of the second abutting ring away from the accommodating cavity, and the other end of the retaining ring extends toward the outer sealing portion.

[0027] In some embodiments, the outer sealing portion includes an outer frame, an outer sealing ring, a first sealing lip and a second sealing lip; the outer frame is embedded in the outer sealing ring; the first sealing lip is fixedly connected to the outer sealing ring; the first sealing lip abuts against the connecting ring; one end of the second sealing lip is fixedly connected to the outer sealing ring, and the other end extends to the second abutting ring; there is a distance between the second sealing lip and the second abutting ring; the second sealing lip is located between the first sealing lip and the retaining ring.

[0028] In order to solve the problem of low reliability of the wheel hub bearing assembly method, the present invention has the following advantages:

[0029] By pre-coating sealant on the assembly path of the inner sealing part, the first abutment ring and the bearing inner ring are interference fit, so that when the inner sealing part is assembled to the bearing inner ring, the first abutment ring and the bearing inner ring are assembled more tightly, so that the sealing rubber ball can be pushed forward, and the sealant is fully distributed in the matching position between the first abutment ring and the bearing inner ring during the flow process, so that the first sealing unit can be more closely matched with the bearing inner ring, thereby achieving a better sealing effect with less glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a process flow of a wheel hub bearing assembly method according to an embodiment is shown;

[0031] Figure 2 A schematic diagram of a hub bearing according to an embodiment is shown;

[0032] Figure 3 Shows Figure 2 An enlarged view of part A of the wheel hub bearing is used to illustrate the first sealing unit.

[0033] Figure numerals: 10 inner ring unit; 11 first flange; 12 bearing inner ring; 20 rolling unit; 30 outer ring unit; 31 bearing outer ring; 32 second flange; 40 first sealing unit; 41 outer sealing part; 411 outer frame; 412 outer sealing ring; 413 first sealing lip; 414 second sealing lip; 42 inner sealing part; 421 first abutting ring; 422 connecting ring; 423 second abutting ring; 424 retaining ring; 425 sealing rubber ring; 426 sealing rubber film; 50 second sealing unit; 60 accommodating chamber. DETAILED DESCRIPTION

[0034] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0035] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0036] When assembling the wheel hub bearing, the installation of the sealing ring is a crucial step. In order to ensure good sealing, a dynamic sealing ring is often used in conjunction with the bearing that needs to rotate at high speed. The sealing cavity formed by the dynamic sealing ring and the bearing can also be relatively static during the rotation process, thereby maintaining the sealing effect. However, one of the double sealing rings is located at the corner where the bearing inner ring 12 is connected to the flange, and the position is easily offset, which deteriorates the sealing effect. To solve this problem, a wheel hub bearing assembly method is disclosed in this embodiment, such as Figure 1 As shown, the wheel hub bearing assembly method includes steps S10 to S40, and each step is described in detail as follows:

[0037] Step S10, after the inner ring unit 10 is positioned, a sealing rubber ring 425 can be applied to the inner ring unit 10. The inner ring unit 10 includes a first flange 11 and a bearing inner ring 12, the first flange 11 and the bearing inner ring 12 are coaxial and integrally formed, and the sealing rubber ring 425 can be applied at the end of the bearing inner ring 12 close to the first flange 11.

[0038] Step S20, after the sealing rubber ring 425 is coated, the inner sealing part 42 can be controlled to be positioned. When the inner sealing part 42 is positioned, the inner sealing part 42 is coaxially arranged with the inner ring unit 10. The inner sealing part 42 includes a first abutment ring 421, a connecting ring 422, and a second abutment ring 423 which are coaxially and integrally formed in sequence. The outer diameter of the first abutment ring 421 is smaller than the inner diameter of the second abutment ring 423, and there is an axial spacing between the first abutment ring 421 and the second abutment ring 423. When the inner sealing part 42 is positioned, the first abutment ring 421 can abut against the inner ring unit 10, and the second abutment ring 423 and the first flange 11 are spaced apart.

[0039] Step S30, after the inner sealing part 42 is positioned, the inner sealing part 42 can be controlled to move toward the first flange 11 and push the sealing rubber ring 425 to flow along the outer surface of the bearing inner ring 12 until the second abutting ring 423 abuts against the first flange 11. When the sealing rubber ring 425 flows, a sealing rubber film 426 can be formed on the remaining surface of the fitting between the first abutting ring 421 and the bearing inner ring 12, and the sealing rubber film 426 can play a role in fixing the position of the first abutting ring 421. When the second abutting ring 423 abuts against the first flange 11, the bearing inner ring 12 is inserted into the first abutting ring 421 and the two can be interference fit to ensure the sealing effect, and a closed accommodating cavity 60 is formed between the connecting ring 422, the bearing inner ring 12 and the first flange 11. After the inner sealing part 42 is installed, the sealing rubber ring 425 is in a solidified state near the first abutting ring 421 in the accommodating cavity 60, and the coating position of the sealing rubber ring 425 is located on the assembly path of the first abutting ring 421. The assembly path is the movement path of the first abutting ring 421 along the outer surface of the bearing inner ring 12.

[0040] Step S40, after the second abutting ring 423 abuts against the first flange 11, the outer sealing part 41, the rolling unit 20, the outer ring unit 30, and the second sealing unit 50 are respectively assembled with the inner ring unit 10. The outer sealing part 41 is assembled at one end of the outer ring unit 30, and one side abuts against the inner sealing part 42. The outer sealing part 41 and the inner sealing part 42 form a dynamic sealing structure, so that the bearing inner ring 12 can rotate together to form a stable sealing space. The second sealing unit 50 is assembled at the end of the bearing inner ring 12 away from the first flange 11, and the second sealing unit 50 is assembled between the bearing inner ring 12 and the outer ring unit 30. The second sealing unit 50 is also a dynamic sealing structure, which can ensure the sealing effect when the bearing rotates.

[0041] In this embodiment, the sealing rubber ring 425 can be an anaerobic sealant. After the second abutting ring 423 abuts against the first flange 11, and a sealed accommodating cavity 60 is formed between the connecting ring 422, the bearing inner ring 12 and the first flange 11, the sealing rubber ring 425 in the accommodating cavity 60 and the sealing rubber film 426 between the first abutting ring 421 and the bearing inner ring 12 can solidify quickly. The anaerobic sealant can maintain a fluid state when coating the sealing rubber ring 425, which is beneficial to the coating process.

[0042] In this embodiment, when the inner ring unit 10 is positioned, the inner ring unit 10 is vertically arranged, and the first flange 11 is located at the top of the bearing inner ring 12. At this time, the sealing rubber ring 425 located at the end of the bearing inner ring 12 close to the first flange 11 will rely on gravity to flow toward the first abutment ring 421, thereby being more evenly distributed on the moving path of the first abutment ring 421 to improve the sealing effect.

[0043] When the inner sealing portion 42 is positioned, the inner sealing portion 42 is located below the first flange 11 , and the sealing rubber ring 425 is located between the inner sealing portion 42 and the first flange 11 .

[0044] In this embodiment, when the inner sealing portion 42 is positioned, the distance between the second abutting ring 423 and the first flange 11 is greater than the axial length of the first abutting ring 421, so that the second abutting ring 423 can be interference-fitted with the first flange 11. In addition, the distance between the second abutting ring 423 and the first flange 11 is also the distance moved by the first abutting ring 421, so that during the coating process, the entire surface of the first abutting ring 421 in contact with the bearing inner ring 12 can be coated with the sealing film 426, so that the sealing effect is better.

[0045] In this embodiment, step S10 may further include: the volume of the coated sealing rubber ring 425 satisfies the following formula:

[0046] 0.3 <V1:V2<0.5。

[0047] Among them, V1 is the volume of the coated sealing rubber ring 425, and V2 is the volume of the accommodating cavity 60. The ratio of the volume of the sealing rubber ring 425 to the volume of the accommodating cavity 60 is a certain value, which can reduce the amount of glue while avoiding overflow. In addition, the volume of the sealing rubber ring 425 is also sufficient to meet the coating area of ​​the sealing film 426, thereby ensuring the sealing effect while saving costs.

[0048] In this embodiment, the surface roughness of the inner sealing part 42 abutting against the bearing inner ring 12 is greater than the surface of the inner sealing part 42 facing the outer sealing part 41. The surface roughness of the inner sealing part 42 abutting against the bearing inner ring 12 is large, and the sealing effect can be ensured by the sealant, while the surface roughness of the other side is small, so that the outer sealing part 41 and the inner sealing part 42 can abut more tightly and the sealing effect is better.

[0049] In this embodiment, a wheel hub bearing is disclosed. The wheel hub bearing is applied to any wheel hub bearing assembly method in the above embodiments, such as Figure 2 and Figure 3 As shown, the wheel hub bearing may include an inner ring unit 10 , a rolling unit 20 , an outer ring unit 30 , a first sealing unit 40 , a second sealing unit 50 and an accommodating chamber 60 .

[0050] The inner ring unit 10 may include a first flange 11 and a bearing inner ring 12 , and the first flange 11 and the bearing inner ring 12 are integrally formed.

[0051] The outer ring unit 30 may include a bearing outer ring 31 and a second flange 32 , and the bearing outer ring 31 and the second flange 32 are integrally formed. The inner ring unit 10 is rotatably connected to the outer ring unit 30 via the rolling unit 20 .

[0052] The first sealing unit 40 is assembled at one end of the bearing inner ring 12 close to the first flange 11, and the first sealing unit 40 is assembled between the bearing inner ring 12 and the outer ring unit 30. The first sealing unit 40 may include an outer sealing portion 41 and an inner sealing portion 42. The inner sealing portion 42 is interference fit with the bearing inner ring 12, one side of the outer sealing portion 41 abuts against the outer ring unit 30, and the other side cooperates with the inner sealing portion 42 to form a dynamic sealing structure. The inner sealing portion may include a first abutting ring 421, a connecting ring 422, a second abutting ring 423, a sealing rubber ring 425, and a sealing rubber film 426. The first abutting ring 421 abuts against the bearing inner ring 12, and the second abutting ring 423 abuts against the first flange 11. The mating surface of the first abutting ring 421 and the bearing inner ring 12 has a sealing rubber film 426, which can fix the position of the first abutting ring 421 and enhance the sealing performance. There is an axial spacing between the first abutting ring 421 and the second abutting ring 423. Preferably, the axial length of the first abutting ring 421 may be greater than that of the second abutting ring 423, and the radial thickness of the first abutting ring 421 may be less than that of the second abutting ring 423. The connecting ring 422 may be a tapered ring, the end with a smaller cross section is integrally formed with the first abutting ring 421, and the end with a larger cross section is integrally formed with the second abutting ring 423. In another embodiment, the connecting ring 422 may be a ring with an arc-shaped cross section along the radial direction, and the two ends are tangent to the first abutting ring 421 and the second abutting ring 423 and are integrally formed.

[0053] The second sealing unit 50 is assembled at the end of the bearing inner ring 12 away from the first flange 11, and the second sealing unit 50 is assembled between the bearing inner ring 12 and the outer ring unit 30. The second sealing unit 50 is a dynamic sealing structure and can rotate with the inner ring unit 10, thereby ensuring the sealing performance of the wheel hub bearing when rotating at high speed.

[0054] The accommodating cavity 60 is a closed space surrounded by the connecting ring 422 , the first flange 11 and the bearing inner ring 12 . The sealing rubber ring 425 is located inside the accommodating cavity 60 and close to the end of the first abutting ring 421 .

[0055] In this embodiment, if Figure 3 As shown, the connecting ring 422 is a conical ring, and the taper of the connecting ring 422 is 35° to 50°. Too large or too small a taper can easily cause the position of the sealing rubber ring 425 to deviate, and maintaining a moderate angle can make the sealing rubber film 426 more evenly coated.

[0056] In this embodiment, if Figure 3 As shown, the inner sealing part 42 may further include a retaining ring 424. One end of the retaining ring 424 is integrally formed with an end of the second abutting ring 423 away from the accommodating cavity 60, and the other end extends toward the outer sealing part 41. The retaining ring 424 may play a first-level blocking effect.

[0057] In this embodiment, if Figure 3 As shown, the outer sealing portion 41 includes an outer frame 411, an outer sealing ring 412, a first sealing lip 413 and a second sealing lip 414. The outer frame 411 is embedded in the outer sealing ring 412. The first sealing lip 413 is integrally formed with the outer sealing ring 412, and the first sealing lip 413 abuts against the connecting ring 422. One end of the second sealing lip 414 is integrally formed with the outer sealing ring 412, and the other end extends to the second abutting ring 423. There is a gap between the second sealing lip 414 and the second abutting ring 423. The second sealing lip 414 is located between the first sealing lip 413 and the retaining ring 424, which plays a second-level blocking effect and strengthens the overall sealing effect of the first sealing unit 40.

[0058] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A wheel hub bearing assembly method, characterized in that: The hub bearing assembly method comprises: Step S10, based on the inner ring unit being positioned, coating a sealing rubber ring on the inner ring unit; the inner ring unit comprises a first flange and a bearing inner ring; the first flange is coaxial with the bearing inner ring and is integrally formed; the coating position of the sealing rubber ring is at the end of the bearing inner ring close to the first flange; Step S20, based on the completion of coating of the sealing rubber ring, control the inner sealing part to be positioned; in the state where the inner sealing part is positioned, the inner sealing part is coaxially arranged with the inner ring unit; the inner sealing part comprises a first abutting ring, a connecting ring and a second abutting ring which are coaxial and integrally formed in sequence; the outer diameter of the first abutting ring is smaller than the inner diameter of the second abutting ring; there is an axial spacing between the first abutting ring and the second abutting ring; Step S30, based on the completion of the positioning of the inner sealing part, control the inner sealing part to move toward the first flange and push the sealing rubber ring to flow along the outer surface of the bearing inner ring until the second abutting ring abuts against the first flange; when the sealing rubber ring flows, a sealing rubber film is formed on the remaining surface of the fitting surface between the first abutting ring and the bearing inner ring; when the second abutting ring abuts against the first flange, the bearing inner ring is inserted into the first abutting ring and the two are interference fit, and a closed accommodating cavity is formed between the connecting ring, the bearing inner ring and the first flange, and the sealing rubber ring is in a solidified state in the accommodating cavity near the first abutting ring; the coating position of the sealing rubber ring is located on the assembly path of the first abutting ring; Step S40, based on the second abutment ring abutting against the first flange, the outer sealing part, the rolling unit, the outer ring unit, and the second sealing unit are respectively assembled with the inner ring unit; the outer sealing part is assembled at one end of the outer ring unit; the outer sealing part and the inner sealing part form a dynamic sealing structure; the second sealing unit is assembled at the end of the bearing inner ring away from the first flange; and the second sealing unit is assembled between the bearing inner ring and the outer ring unit; the second sealing unit is a dynamic sealing structure.

2. A wheel hub bearing assembly method according to claim 1, characterized in that: The sealing rubber ring is an anaerobic sealing adhesive.

3. A wheel hub bearing assembly method according to claim 1, characterized in that: When the inner ring unit is positioned, the inner ring unit is vertically arranged, and the first flange is located at the top of the inner ring of the bearing; When the inner sealing portion is positioned, the inner sealing portion is located below the first flange, and the sealing rubber ring is located between the inner sealing portion and the first flange.

4. A wheel hub bearing assembly method according to claim 1, characterized in that: When the inner sealing portion is positioned, the distance between the second abutment ring and the first flange is greater than the axial length of the first abutment ring.

5. A wheel hub bearing assembly method according to claim 1, characterized in that: The step S10 further includes: coating the sealing rubber ring with a volume that satisfies the following formula: 0.3 <V1:V2<0.5; Wherein, V1 is the volume coated with the sealing rubber ring, and V2 is the volume of the accommodating cavity.

6. A wheel hub bearing assembly method according to claim 1, characterized in that: The surface roughness of the side of the inner sealing portion abutting against the inner ring of the bearing is greater than the surface of the side of the inner sealing portion facing the outer sealing portion.

7. A wheel hub bearing, characterized in that: The wheel hub bearing is applied to the wheel hub bearing assembly method according to any one of claims 1 to 6, and the wheel hub bearing comprises: An inner ring unit, the inner ring unit comprising a first flange and a bearing inner ring; the first flange and the bearing inner ring are fixedly connected; Rolling unit; An outer ring unit, the outer ring unit comprising a bearing outer ring and a second flange; the bearing outer ring and the second flange are fixedly connected; the inner ring unit is rotationally connected to the outer ring unit via the rolling unit; A first sealing unit, the first sealing unit comprises an outer sealing part and an inner sealing part; the inner sealing part is interference fit with the inner ring of the bearing; the outer sealing part cooperates with the inner sealing part to form a dynamic sealing structure; the inner sealing part comprises a first abutting ring, a connecting ring, a second abutting ring, a sealing rubber ring and a sealing rubber film; the first abutting ring abuts with the inner ring of the bearing, and the second abutting ring abuts with the first flange; the matching surface of the first abutting ring and the inner ring of the bearing has a sealing rubber film; there is an axial spacing between the first abutting ring and the second abutting ring; one end of the connecting ring is fixedly connected to the first abutting ring, and the other end is fixedly connected to the second abutting ring; A second sealing unit; the second sealing unit is mounted at the end of the bearing inner ring away from the first flange; and the second sealing unit is mounted between the bearing inner ring and the outer ring unit; the second sealing unit is a dynamic sealing structure; The accommodating chamber is a closed space surrounded by the connecting ring, the first flange and the inner ring of the bearing; the sealing rubber ring is located inside the accommodating chamber near the end of the first abutting ring.

8. A wheel hub bearing according to claim 7, characterized in that: The connecting ring is a conical ring, and the taper of the connecting ring is 35°~50°.

9. The wheel hub bearing according to claim 7, characterized in that: The inner sealing part further comprises a retaining ring; one end of the retaining ring is fixedly connected to an end of the second abutting ring away from the accommodating cavity, and the other end of the retaining ring extends toward the outer sealing part.

10. A wheel hub bearing according to claim 9, characterized in that: The outer sealing part includes an outer frame, an outer sealing ring, a first sealing lip and a second sealing lip; the outer frame is embedded in the outer sealing ring; the first sealing lip is fixedly connected to the outer sealing ring; the first sealing lip abuts against the connecting ring; one end of the second sealing lip is fixedly connected to the outer sealing ring, and the other end extends to the second abutting ring; there is a distance between the second sealing lip and the second abutting ring; the second sealing lip is located between the first sealing lip and the retaining ring.

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