Hub unit and bearing sealing structure

Abstract

The utility model relates to the technical field of hub bearings, in particular to a bearing sealing structure which comprises an annular framework and an elastic sealing body, the elastic sealing body comprises a sealing body at least partially wrapping the framework and a sealing lip set located on the outer side of the sealing body, and the sealing lip set comprises an inner side sealing lip and at least two outer side sealing lips. The inner side sealing lip extends towards the center of the sealing body and inclines towards the inner side of the sealing body, and the outer side sealing lip extends away from the center of the sealing body and inclines towards the outer side of the sealing body. The framework is in an L shape, two abutting end faces with perpendicular cross sections are formed on the inner side of the framework, one end of the sealing body wraps the framework and forms an inner side sealing ring, and the inner side sealing ring and the inner side sealing lip are arranged at the two ends in the length direction of the cross section of the elastic sealing body respectively. According to the invention, good waterproof and dustproof performance can still be achieved in a severe use environment, and a long service life can be maintained in a high-temperature environment.

Description

Technical Field

[0001] The present application relates to the technical field of wheel hub bearings, and in particular to a wheel hub unit and a bearing sealing structure. Background Art

[0002] In today's automotive industry, wheel hub units are a crucial component of vehicles, fulfilling critical functions such as supporting vehicle weight, transmitting power, and providing braking. However, their unique mounting location presents numerous challenges during use. Firstly, the wheel hub unit is exposed to air and close to the ground, making it susceptible to environmental factors such as rain and dust. Secondly, heat generated by the vehicle's powertrain and braking systems is transferred to the wheel hub unit, exposing it to high temperatures.

[0003] Therefore, with the continuous development of the automotive industry, the performance requirements for wheel hub units are becoming increasingly higher. In order to adapt to complex operating environments, wheel hub units must not only have good waterproof and dustproof effects to ensure the normal operation of vehicles in various climate conditions, but also maintain a long service life in high temperature environments.

[0004] Although some existing wheel hub designs are waterproof and dustproof, their service life and performance in high-temperature environments are still insufficient. To address this issue, it is necessary to develop a new wheel hub that can maintain good waterproof and dustproof performance even in harsh operating environments and maintain a long service life in high-temperature environments. Utility Model Content

[0005] In order to have good waterproof and dustproof performance in harsh operating environments and maintain a long service life in high temperature environments, the present application provides a hub unit and a bearing sealing structure.

[0006] On the one hand, the present application provides a bearing sealing structure, which adopts the following technical solution:

[0007] A bearing sealing structure comprises an annular skeleton and an elastic sealing body, wherein the elastic sealing body comprises a sealing body that at least partially wraps the skeleton, and a sealing lip group located on the outside of the sealing body, wherein the sealing lip group comprises an inner sealing lip and at least two outer sealing lips, wherein the inner sealing lip extends toward the center of the sealing body and is inclined toward the inside of the sealing body, and the outer sealing lips extend away from the center of the sealing body and are inclined toward the outside of the sealing body; the skeleton is L-shaped and forms two abutting end faces with perpendicular cross sections on the inside, one end of the sealing body wraps the skeleton and forms an inner sealing ring, and the inner sealing ring and the inner sealing lip are respectively arranged at both ends along the length direction of the cross section of the elastic sealing body.

[0008] By adopting this technical solution, the skeleton provides support and protection for the elastic seal, preventing the temperature inside the bearing from directly affecting the elastic seal, thereby increasing its service life. The sealing lip assembly and inner sealing ring respectively seal the inner and outer sides of the sealing ring. The inner sealing ring and skeleton both abut against the outer ring of the bearing to form a double seal. The outer sealing is achieved by the sealing lip assembly. The inner sealing lip of the sealing lip assembly primarily seals the oil inside the bearing to prevent it from leaking out. The multi-layer outer sealing lip provides excellent waterproof and dustproof effects, achieving isolation from the external environment. This multi-layer sealing can effectively improve the sealing effect and service life of the inner sealing lip.

[0009] In one embodiment, a protrusion is provided on the extended end portion of the inner sealing lip, and the protrusion is provided on an end of the extended end surface of the inner sealing lip close to the inner side of the sealing body.

[0010] By adopting the above technical solution, the protrusion setting can improve the service life and sealing performance of the inner sealing lip. On the one hand, when the bearing is installed, it has a blocking effect to prevent the end of the inner sealing lip from bending toward the outside of the sealing body, which may cause the sealing effect to deteriorate or fail. On the other hand, when the pressure in the bearing increases, the contact between the protrusion and the hub body can further improve the sealing effect.

[0011] In one embodiment, the thickness of the inner sealing lip is gradually increased along the extension direction.

[0012] By adopting the above technical solution, on the one hand, the sealing performance can be improved, and on the other hand, better wear resistance can be achieved.

[0013] In one embodiment, the thickness of the outer sealing lip is gradually reduced along the extension direction.

[0014] By adopting the above technical solution, since the outer sealing lip is relatively long, the gradually tapering arrangement can improve the connection between the outer sealing lip and the sealing body and the overall structural strength.

[0015] In one embodiment, there are three outer sealing lips, which are the first outer sealing lip, the second outer sealing lip and the third outer sealing lip in the direction away from the center of the sealing body. The inclination angle of the first outer sealing lip is smaller than that of the second outer sealing lip, and the inclination angle of the second outer sealing lip is smaller than or equal to that of the third outer sealing lip.

[0016] By adopting the above technical solution, when the outer sealing lip with a small inclination angle is in contact with the hub body, the deformation generated is large, so the sealing performance is better, but it is also prone to wear. By setting different inclination angles, the sealing performance and service life can be guaranteed at the same time.

[0017] In one embodiment, the minimum thickness of the third outer sealing lip is smaller than that of the second outer sealing lip, and the minimum thickness of the second outer sealing lip is greater than or equal to that of the third outer sealing lip.

[0018] By adopting the above technical solution, the greater the thickness, the better the sealing, but the greater the wear. Therefore, combined with the inclination angle design, the third outer sealing lip is prioritized to ensure service life, while the first outer sealing lip and the second outer sealing lip are prioritized to ensure sealing, and a hierarchy is formed through different settings, that is, the sealing becomes smaller from the first to the third, while the wear resistance becomes larger.

[0019] In one embodiment, a step recessed inward is provided on one side of the sealing body close to the center, the first outer sealing lip and the second outer sealing lip are provided on the step, and the third outer sealing lip is provided outside the step.

[0020] By adopting the above technical solution and setting the steps, the length of the first outer sealing lip and the second outer sealing lip can be increased. The increased length can reduce the deformation force generated by the seal, thereby reducing the wear rate.

[0021] In one embodiment: the minimum distance between the end of the second outer sealing lip and the sealing body is greater than the minimum distance between the end of the third outer sealing lip and the sealing body, and the minimum distance between the end of the first outer sealing lip and the sealing body is less than the minimum distance between the end of the third outer sealing lip and the sealing body.

[0022] By adopting this technical solution, a larger minimum distance results in greater deformation during sealing, improving sealing performance. This, combined with an increased step length, results in a better seal and relatively slower wear, ensuring sealing without significantly increasing wear. The first outer sealing lip is the shortest because it abuts the hub flange at its corner, allowing for a smaller distance.

[0023] In one embodiment, an avoidance chamfer is provided at one end of the frame close to the inner sealing ring, and a smooth transition is provided between the inner wall of the inner sealing ring and the avoidance chamfer.

[0024] By adopting the above technical solution, since the inner sealing ring achieves sealing by contacting the outer side of the bearing outer ring, the avoidance chamfer setting can achieve sealing by contacting the bearing outer ring without the inner sealing ring protruding from the frame. In this way, the balance between sealing and wear resistance can be better ensured.

[0025] On the other hand, the present application provides a bearing sealing structure, which adopts the following technical solution:

[0026] A hub unit comprises a hub body and a bearing outer ring, wherein a hub flange is provided at one end of the hub body, and a bearing sealing structure as described above is provided between the hub body and the bearing outer ring, wherein the bearing sealing structure is located between the bearing outer ring and the hub flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the structure of the hub unit in the embodiment;

[0028] Figure 2 This is the structure of the bearing seal structure in the embodiment.

[0029] In the figure, 10, hub body; 11, hub flange; 20, bearing outer ring; 100, skeleton; 110, avoidance chamfer; 200, elastic sealing body; 210, sealing body; 220, inner sealing lip; 221, protrusion; 230, first outer sealing lip; 240, second outer sealing lip; 250, third outer sealing lip; 260, inner sealing ring. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the accompanying drawings.

[0031] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0032] A hub unit, such as Figure 1 As shown, it includes a hub body 10 and a bearing outer ring 20. A hub flange 11 is provided at one end of the hub body 10. A bearing sealing structure is provided between the hub body 10 and the bearing outer ring 20. The bearing sealing structure is located between the bearing outer ring 20 and the hub flange 11.

[0033] like Figure 2 As shown, the bearing sealing structure includes a ring-shaped skeleton 100 and an elastic sealing body 200. In this embodiment, the cross-sectional shape is used for explanation. The skeleton 100 is L-shaped as a whole, wherein the two inner ends forming a 90-degree angle are respectively used to form a seal with the end face and the outer side face of the bearing outer ring 20.

[0034] Among them, the elastic sealing body 200 includes a sealing body 210 that at least partially wraps the skeleton 100, and a sealing lip group located on the outside of the sealing body 210. The sealing body 210 wraps the outside of the skeleton 100 and forms a small part of the inside of the skeleton 100, thereby forming a structure that enables the skeleton 100 to be firmly embedded in the sealing body 210.

[0035] The sealing lip group includes an inner sealing lip 220 and at least two outer sealing lips. The inner sealing lip 220 extends toward the center of the sealing body 210 and is inclined toward the inner side of the sealing body 210. The extended end of the inner sealing lip 220 is provided with a protrusion 221. The protrusion 221 is provided at one end of the extended end surface of the inner sealing lip 220 close to the inner side of the sealing body 210. The cross-section of the protrusion 221 is a triangular structure, but is not limited to this. It can also be an arc-shaped or polygonal structure.

[0036] In addition, the thickness of the inner sealing lip 220 is gradually increased along the extending direction, and the gradually increasing angle a is less than 6°.

[0037] The outer sealing lips extend away from the center of the sealing body 210 and are inclined toward the outside of the sealing body 210. Specifically, there are three outer sealing lips, which are, in the direction away from the center of the sealing body 210, a first outer sealing lip 230, a second outer sealing lip 240, and a third outer sealing lip 250.

[0038] The inclination angle α of the first outer sealing lip 230 is smaller than the inclination angle β of the second outer sealing lip 240 . The inclination angle β of the second outer sealing lip 240 is smaller than or equal to the inclination angle γ of the third outer sealing lip 250 .

[0039] The minimum thickness d of the third outer sealing lip 250 is less than the minimum thickness c of the second outer sealing lip 240 , and the minimum thickness c of the second outer sealing lip 240 is greater than or equal to the minimum thickness b of the third outer sealing lip 250 .

[0040] A step recessed inward is provided on one side of the sealing body 210 near the center. The first outer sealing lip 230 and the second outer sealing lip 240 are provided on the step, and the third outer sealing lip 250 is provided outside the step.

[0041] The minimum distance between the end of the second outer sealing lip 240 and the sealing body 210 is greater than the minimum distance between the end of the third outer sealing lip 250 and the sealing body 210, and the minimum distance between the end of the first outer sealing lip 230 and the sealing body 210 is less than the minimum distance between the end of the third outer sealing lip 250 and the sealing body 210. For details, please refer to the distances e and f in the figure, and the distance f is greater than e.

[0042] The thicknesses of the three outer sealing lips are gradually reduced along the extension direction.

[0043] One end of the sealing body 210 wraps around the frame 100 and forms an inner sealing ring 260 . The inner sealing ring 260 and the inner sealing lip 220 are respectively provided at both ends along the length direction of the cross section of the elastic sealing body 200 .

[0044] An avoidance chamfer 110 is provided at one end of the frame 100 close to the inner sealing ring 260 , and a smooth transition is provided between the inner wall of the inner sealing ring 260 and the avoidance chamfer 110 .

[0045] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bearing sealing structure, comprising an annular frame (100) and an elastic sealing body (200), characterized in that: The elastic sealing body (200) comprises a sealing body (210) that at least partially wraps around a skeleton (100), and a sealing lip group located outside the sealing body (210), wherein the sealing lip group comprises an inner sealing lip (220) and at least two outer sealing lips, wherein the inner sealing lip (220) extends toward the center of the sealing body (210) and is inclined toward the inner side of the sealing body (210), and the outer sealing lip extends away from the center of the sealing body (210) and is inclined toward the outer side of the sealing body (210); the skeleton (100) is L-shaped and forms two abutment end faces with perpendicular cross sections on the inner side; one end of the sealing body (210) wraps around the skeleton (100) and forms an inner sealing ring (260); the inner sealing ring (260) and the inner sealing lip (220) are respectively arranged at two ends along the length direction of the cross section of the elastic sealing body (200).

2. The bearing sealing structure according to claim 1 is characterized in that: The extended end portion of the inner sealing lip (220) is provided with a protrusion (221), and the protrusion (221) is provided at an end of the extended end surface of the inner sealing lip (220) close to the inner side of the sealing body (210).

3. The bearing sealing structure according to claim 1 or 2, characterized in that: The thickness of the inner sealing lip (220) is gradually increased along the extension direction.

4. The bearing sealing structure according to claim 1 is characterized in that: The thickness of the outer sealing lip is gradually reduced along the extending direction.

5. The bearing sealing structure according to claim 1 or 4, characterized in that: The outer sealing lips are provided with three, and the outer sealing lips are respectively a first outer sealing lip (230), a second outer sealing lip (240) and a third outer sealing lip (250) along a direction away from the center of the sealing body (210); the inclination angle of the first outer sealing lip (230) is smaller than that of the second outer sealing lip (240), and the inclination angle of the second outer sealing lip (240) is smaller than or equal to that of the third outer sealing lip (250).

6. The bearing sealing structure according to claim 5, characterized in that: The minimum thickness of the third outer sealing lip (250) is smaller than that of the second outer sealing lip (240), and the minimum thickness of the second outer sealing lip (240) is greater than or equal to that of the third outer sealing lip (250).

7. The bearing sealing structure according to claim 5, characterized in that: A step recessed inward is provided on one side of the sealing body (210) close to the center, the first outer sealing lip (230) and the second outer sealing lip (240) are provided on the step, and the third outer sealing lip (250) is provided outside the step.

8. The bearing sealing structure according to claim 7, characterized in that: The minimum distance between the end of the second outer sealing lip (240) and the sealing body (210) is greater than the minimum distance between the end of the third outer sealing lip (250) and the sealing body (210), and the minimum distance between the end of the first outer sealing lip (230) and the sealing body (210) is less than the minimum distance between the end of the third outer sealing lip (250) and the sealing body (210).

9. The bearing sealing structure according to claim 1, characterized in that: An end of the frame (100) close to the inner sealing ring (260) is provided with an avoidance chamfer (110), and a smooth transition is provided between the inner wall of the inner sealing ring (260) and the avoidance chamfer (110).

10. A wheel hub unit, comprising a wheel hub body (10) and a bearing outer ring (20), wherein one end of the wheel hub body (10) is provided with a wheel hub flange (11), wherein: A bearing sealing structure according to any one of claims 1 to 9 is provided between the hub body (10) and the bearing outer ring (20), and the bearing sealing structure is located between the bearing outer ring (20) and the hub flange (11).

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