Bearing sealing structure, rolling bearing and hub double-row angular contact ball bearing

Abstract

The utility model relates to the field of bearings, and particularly discloses a bearing sealing structure, a rolling bearing and a hub double-row angular contact ball bearing. The bearing sealing structure comprises a dustproof cover and a sealing cover which are arranged in a split mode, the dustproof cover comprises a cover body and an inner pressing ring, and the inner pressing ring is located on one side of the cover body and fixedly connected with the inner edge of the cover body; the sealing cover comprises a framework, the framework comprises a frame body and an outer pressing ring, and the outer pressing ring is located on one side of the frame body and fixedly connected with the outer edge of the frame body. An annular first sealing lip is arranged on the inner edge of the frame body, and an annular second sealing lip is arranged on one side of the frame body; the inner diameter of the framework is larger than the outer diameter of the inner pressing ring and smaller than the outer diameter of the cover body, and the outer diameter of the cover body is smaller than the inner diameter of the outer pressing ring. The bearing sealing structure has the advantages of being reliable in structure, high in applicability and good in sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of bearings, specifically to a bearing sealing structure, a rolling bearing, and a hub double-row angular contact ball bearing. Background Technology

[0002] Bearings are crucial components in mechanical equipment. Their primary functions are to support rotating parts, bear loads, reduce the coefficient of friction during movement, and ensure rotational accuracy. Bearings typically consist of an inner ring, an outer ring, rolling elements, and a cage. The rolling elements are positioned between the inner and outer rings. For high-performance bearings, an oil seal is often installed between the inner and outer rings. The oil seal, inner ring, and outer ring together form a sealed space within which the rolling elements are housed. The oil seal prevents lubricating grease from leaking out of the sealed space, ensuring adequate lubrication. It also prevents external impurities from entering the sealed space, ensuring efficient operation of the rolling elements.

[0003] To improve the sealing performance of oil seals, multi-lip seals are often used, forming a multi-stage labyrinth seal through multiple sealing lips to enhance the sealing effect. For example, Chinese utility model patent CN 218440213 U discloses an angular contact ball bearing for a mid-drive motor in an electric bicycle, including an inner ring, an outer ring, rolling elements, and two sealing caps. The inner ring has an inner groove on its outer side, and the outer ring has an outer groove on its inner side. The rolling elements are positioned between the two sealing caps. The inner edge of each sealing cap has a sealing portion extending radially inward, and the outer side of the inner ring has a sealing groove corresponding to the sealing cap. The sealing portion extends partially or completely into the sealing groove. The sealing portion has a main sealing lip and a secondary sealing lip. The main sealing lip extends inward and presses against the sidewall of the sealing groove, while the secondary sealing lip tilts outward and presses against the outer side of the inner ring or the corresponding sidewall of the sealing groove. The angular contact ball bearing described above achieves multi-lip sealing through the cooperation of the main and secondary sealing lips, effectively ensuring the sealing effect.

[0004] However, in the aforementioned angular contact ball bearings, the sealing part is in direct contact with the outer edge of the inner ring. In order to ensure reliable contact and sealing between the main sealing lip and the secondary sealing lip and the outer ring, a sealing groove is set on the corresponding outer edge of the inner ring. This will increase the processing difficulty and processing cost of the inner ring, which is not conducive to its widespread adoption. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a bearing sealing structure, a rolling bearing and a hub double-row angular contact ball bearing, which has the advantages of reliable structure, strong applicability and good sealing effect.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a bearing sealing structure, including a dust cover and a sealing cover that are separately set. The dust cover includes a cover body and an inner pressure ring. The cover body is arranged in a ring shape. The inner pressure ring is located on one side of the cover body and is fixedly connected to the inner edge of the cover body.

[0007] The sealing cover includes a frame, which includes a frame body and an outer pressure ring. The frame body is arranged in a ring shape, and the outer pressure ring is located on one side of the frame body and is fixedly connected to the outer edge of the frame body. The inner edge of the frame body is provided with a ring-shaped first sealing lip, and one side of the frame body is provided with a ring-shaped second sealing lip. The second sealing lip and the outer pressure ring are located on the same side of the frame body.

[0008] The inner diameter of the skeleton is larger than the outer diameter of the inner pressure ring and smaller than the outer diameter of the cover. The outer diameter of the cover is smaller than the inner diameter of the outer pressure ring. In the installed state, the first sealing lip slides in contact with the outer edge of the inner pressure ring, and the second sealing lip slides in contact with one side of the cover.

[0009] The dust cover mates with the inner ring of the bearing, while the sealing cover mates with the outer ring. Axially, the cover is located outside the frame. During operation, the dust cover acts as the first line of protection, preventing external impurities from entering. The second sealing lip engages with the first sealing lip to achieve a multi-stage seal, further preventing external impurities from entering and simultaneously preventing internal grease from flowing out. By using the dust cover, not only can larger particles be directly protected, but it can also directly mate with the inner ring of the bearing, eliminating the need for grooves on the inner ring and reducing the requirements for it. The bearing sealing structure of this application has the advantages of reliable structure, strong applicability, and good sealing effect.

[0010] Preferably, the cover and inner clamping ring are integrally bent and formed, and the frame and outer clamping ring are integrally bent and formed. This integral bending and forming process has the advantages of convenient processing and good structural stability.

[0011] Preferably, the number of the second sealing lips is at least two.

[0012] Preferably, the second sealing lip is annularly inclined outward.

[0013] Preferably, the frame includes a first straight section, a bent section and a second straight section in the radial direction from the outside to the inside, and the bent section is inclined relative to the first straight section in the direction of the outward pressing ring.

[0014] By incorporating bent sections, the structural rigidity of the frame can be enhanced, thereby improving the overall sealing effect of the sealing cover. Simultaneously, the inclination of the bent sections relative to the first straight section towards the outward clamping ring reduces the axial space occupied by the sealing cover, thus reducing the installation space required for the bearing sealing structure of this application.

[0015] A rolling bearing includes an inner ring, an outer ring, and rolling elements, characterized in that it further includes at least one bearing sealing structure as described above, wherein the inner clamping ring of the dust cover is sleeved on the outer edge of the inner ring and is interference-fitted; the outer clamping ring of the sealing cover is disposed on the inner edge of the outer ring and is interference-fitted.

[0016] A hub double-row angular contact ball bearing includes an inner ring, an outer ring, rolling elements, and a cage, wherein the rolling elements are arranged in a double row; characterized in that it further includes two bearing sealing structures as described above, wherein the inner clamping ring of the dust cover is sleeved on the outer edge of the inner ring and is interference-fitted; the outer clamping ring of the sealing cover is disposed on the inner edge of the outer ring and is interference-fitted. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the double-row angular contact ball bearing in the hub of this embodiment;

[0018] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 This is a cross-sectional view of the sealing cap in the bearing sealing structure of this embodiment;

[0020] Figure 4 This is a cross-sectional view of the dust cover in the bearing sealing structure of this embodiment. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0022] like Figures 2-4 As shown, a bearing sealing structure includes a separate dust cover 12 and a sealing cover 11. Figure 4 As shown, the dust cover 12 includes a cover body 122 and an inner pressure ring 121. The cover body 122 is arranged in a ring shape, and the inner pressure ring 121 is located on one side of the cover body 122 and is fixedly connected to the inner edge of the cover body 122. Specifically, the cover body 122 and the inner pressure ring 121 are integrally bent into shape.

[0023] like Figure 3 As shown, the sealing cover 11 includes a frame, which includes a frame body 111 and an outer pressure ring 114. The frame body 111 is arranged in a ring shape, and the outer pressure ring 114 is located on one side of the frame body 111 and is fixedly connected to the outer edge of the frame body 111. The frame body 111 and the outer pressure ring 114 are integrally bent into shape.

[0024] like Figure 3 As shown, the inner edge of the frame 111 is provided with an annular first sealing lip 112, and one side of the frame 111 is provided with an annular second sealing lip 113. The second sealing lip 113 and the outer clamping ring 114 are located on the same side of the frame 111. Specifically, there are at least two second sealing lips 113, and the second sealing lips 113 are circumferentially inclined outward.

[0025] like Figure 2 As shown, the inner diameter of the skeleton is larger than the outer diameter of the inner pressure ring 121 and smaller than the outer diameter of the cover 122. The outer diameter of the cover 122 is smaller than the inner diameter of the outer pressure ring 114. In the installed state, the first sealing lip 112 slides in contact with the outer edge of the inner pressure ring 121, and the second sealing lip 113 slides in contact with one side of the cover 122.

[0026] The dust cover 12 mates with the inner ring of the bearing, and the sealing cover 11 mates with the outer ring of the bearing. Axially, the cover 122 is located outside the frame. During operation, the dust cover 12 serves as the first layer of protection, preventing external impurities from entering. The second sealing lip 113 cooperates with the first sealing lip 112 to achieve multi-stage sealing, further preventing external impurities from entering and simultaneously preventing internal grease from flowing out. By providing the dust cover 12, not only can larger particles of impurities be directly protected, but it can also directly mate with the inner ring of the bearing, eliminating the need for slotting on the inner ring and reducing the requirements for the inner ring. The bearing sealing structure of this application has the advantages of reliable structure, strong applicability, and good sealing effect.

[0027] Furthermore, such as Figure 2 and Figure 3 As shown, the frame 111 includes a first straight section 1111, a bent section 1112 and a second straight section 1113 in a radial direction from the outside to the inside. The bent section 1112 is inclined relative to the first straight section 1111 towards the direction of the outer pressing ring 114.

[0028] By setting the bent segment 1112, the structural rigidity of the frame 111 can be enhanced, thereby improving the overall sealing effect of the sealing cover 11. At the same time, the inclination of the bent segment 1112 relative to the first straight segment 1111 towards the outward pressing ring 114 can reduce the space occupied by the sealing cover 11 in the axial direction, thereby reducing the installation space of the bearing sealing structure of this application.

[0029] A rolling bearing includes an inner ring, an outer ring, and rolling elements, and further includes at least one bearing sealing structure 1 as described above, wherein the inner clamping ring 121 of the dust cover 12 is sleeved on the outer edge of the inner ring and is interference-fitted. The outer clamping ring 114 of the sealing cover 11 is disposed on the inner edge of the outer ring and is interference-fitted.

[0030] like Figure 1 As shown, a hub double-row angular contact ball bearing includes an inner ring 5, an outer ring 4, rolling elements 2, and a cage 3, wherein the rolling elements are arranged in a double row; it also includes two bearing sealing structures 1 as described above, wherein the inner clamping ring 121 of the dust cover 12 is sleeved on the outer edge of the inner ring and is interference-fitted. The outer clamping ring 114 of the sealing cover 11 is disposed on the inner edge of the outer ring and is interference-fitted.

[0031] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bearing sealing structure, characterized in that: The invention includes a separate dust cover and a sealing cover. The dust cover includes a cover body and an inner pressure ring. The cover body is arranged in a ring shape. The inner pressure ring is located on one side of the cover body and is fixedly connected to the inner edge of the cover body. The sealing cover includes a frame, which includes a frame body and an outer pressure ring. The frame body is arranged in a ring shape, and the outer pressure ring is located on one side of the frame body and is fixedly connected to the outer edge of the frame body. The inner edge of the frame body is provided with a ring-shaped first sealing lip, and one side of the frame body is provided with a ring-shaped second sealing lip. The second sealing lip and the outer pressure ring are located on the same side of the frame body. The inner diameter of the skeleton is larger than the outer diameter of the inner pressure ring and smaller than the outer diameter of the cover. The outer diameter of the cover is smaller than the inner diameter of the outer pressure ring. In the installed state, the first sealing lip slides in contact with the outer edge of the inner pressure ring, and the second sealing lip slides in contact with one side of the cover.

2. The bearing sealing structure according to claim 1, characterized in that: The cover and the inner pressure ring are integrally bent and formed, and the frame and the outer pressure ring are integrally bent and formed.

3. The bearing sealing structure according to claim 1, characterized in that: The number of the second sealing lips is at least two.

4. The bearing sealing structure according to claim 1, characterized in that: The second sealing lip is annularly inclined outwards.

5. The bearing sealing structure according to any one of claims 1-4, characterized in that: The frame includes a first straight section, a bent section and a second straight section in a radial direction from the outside to the inside. The bent section is inclined relative to the first straight section in the direction of the outward pressing ring.

6. A rolling bearing, comprising an inner ring, an outer ring, and rolling elements, characterized in that: It also includes at least one bearing sealing structure as described in any one of claims 1-5, wherein the inner clamping ring of the dust cover is sleeved on the outer edge of the inner ring and is interference-fitted; the outer clamping ring of the sealing cover is disposed on the inner edge of the outer ring and is interference-fitted.

7. A hub double-row angular contact ball bearing, comprising an inner ring, an outer ring, rolling elements, and a cage, wherein the rolling elements are arranged in a double row; characterized in that: It also includes two bearing sealing structures as described in any one of claims 1-5, wherein the inner clamping ring of the dust cover is sleeved on the outer edge of the inner ring and is interference-fitted; the outer clamping ring of the sealing cover is disposed on the inner edge of the outer ring and is interference-fitted.

Images