Sealing ring

Abstract

The utility model relates to a sealing ring (101, 102, 103), the radial inner side of the sealing ring is provided with sealing lips (21, 22) made of an elastic body, the sealing lips can abut against a rotating part in a relative sliding mode, so that dynamic sealing is formed between a first axial side (A) and a second axial side (B), the sealing lip (21, 22) comprises a first sealing inclined surface facing the first axial side (A) and a second sealing inclined surface facing the second axial side (B), a bead structure (211, 221, 41, 42) is formed on the first sealing inclined surface, the bead structure comprises two bead lines, the two bead lines extend in the circumferential direction in a wave shape or a broken line shape and are closed in the circumferential direction, and the first sealing inclined surface and the second sealing inclined surface face the second axial side (B). The two convex ridge lines intersect with each other to form a plurality of closed areas distributed in the circumferential direction.

Description

Technical Field

[0001] The utility model relates to a sealing technology. In particular, the utility model relates to a sealing ring, especially a dynamic sealing ring. Background Art

[0002] Lip seals for rotating shafts have been widely used for sealing rotating parts of various mechanical equipment. To improve the sealing performance of the sealing ring, in addition to using appropriate materials and precise dimensions, an oil return structure based on hydrodynamics can also be provided at the sealing part. For example, a rib-shaped oil return line at the sealing part of the sealing ring can be manufactured by grooves opened on the mold.

[0003] For example, in the US patent document US 6,729,624 B1, a sealing ring for dynamically sealing a rotating shaft is disclosed. On the inclined surface of the sealing lip facing the oil side, circumferentially spaced bidirectional ribs are provided. Each bidirectional rib includes two ribs, and an angle is formed between the two ribs and they are laterally inclined in different directions relative to the rotation axis of the rotating shaft.

[0004] However, the above-mentioned sealing ring with a rib structure has a great risk of static leakage. Specifically, when the sealing ring does not rotate relative to the rotating part, especially when there is a small amount of pressure in the cavity, the above-mentioned rib structure is likely to cause tiny gaps at the edge of the sealing lip, especially near the starting end of the rib, resulting in leakage of the sealing medium.

[0005] Particularly for some working environments where the sealing medium contains particles, such as at the sealing part of the hub bearing of a truck or at the sealing part on the output side of an electric hub or an electric axle drive system, the sealing ring is used to isolate the grease inside the bearing and the oil in the gearbox. If the sealing ring has static leakage, the metal particles contained in the oil in the gearbox will enter the bearing, thereby affecting the operation of the bearing and reducing the service life of the bearing. Summary of the Utility Model

[0006] Therefore, the purpose of the present utility model is to provide a sealing ring mainly for dynamic sealing, which also has good static sealing performance.

[0007] The above object is achieved by a sealing ring. The sealing ring has a sealing lip made of an elastomer on its radial inner side, wherein the sealing lip abuts against the rotating part in a relatively slidable manner, so as to form a dynamic seal between a first axial side and a second axial side. The sealing lip includes a first sealing inclined surface facing the first axial side and a second sealing inclined surface facing the second axial side. A rib structure is constructed at the first sealing inclined surface. The rib structure includes two rib lines. The two rib lines extend in a wavy or zigzag shape along the circumferential direction respectively and are closed in the circumferential direction respectively. The two rib lines intersect with each other to form a plurality of closed areas distributed in the circumferential direction.

[0008] Within the scope of this article, the sealing ring can be used in particular for dynamically sealing a rotating part. Herein, the central axis of the sealing ring coincides with the rotation axis of the rotating part. Herein, unless otherwise specified, the terms "axial", "radial" and "circumferential direction" are all based on the central axis of the sealing ring, that is, the rotation axis of the rotating part.

[0009] Preferably, the sealing ring is arranged between the outer ring and the inner ring of the bearing. Alternatively, the sealing ring is arranged between a component such as a housing and a rotating part that can rotate relative to the component. The sealing ring is preferably directly or indirectly fixed to the above-mentioned outer ring or the above-mentioned component such as a housing. Thus, when the rotating part rotates, the sealing ring rotates relative to the rotating part together with the component. Herein, the rotating part can be the inner ring of the bearing or a shaft part of a shaft piece or component, or another component fixed to the shaft part of the shaft piece or component.

[0010] Particularly in the embodiment where the sealing ring is installed between the outer ring and the inner ring of the bearing, preferably, the first axial side can be the grease side inside the bearing, and the second axial side can be the oil side inside the gearbox.

[0011] Thus, by means of the above-mentioned rib structure, ribs continuously distributed in the circumferential direction are formed at the sealing lip, which can avoid the risk of leakage from the gap between the head and tail ends of the rib in the existing solutions, and enhance the static sealing performance. At the same time, since closed areas are formed in the rib structure, a certain amount of oil can be stored in the closed areas, thereby improving the lubrication conditions of the sealing lip, being beneficial to the dynamic sealing performance, and the service life of the sealing ring can also be longer.

[0012] In some preferred embodiments, the plurality of closed areas have the same shape and are evenly distributed along the circumferential direction. This can particularly adapt to the working conditions of the two-way rotation of the rotating part.

[0013] Preferably, the two convex rib lines are respectively in the shape of a sine wave and have a phase difference of 180° from each other. Herein, the sealing ring can efficiently form a convex rib structure that is closed in the circumferential direction to optimize the static sealing performance of the sealing ring. At the same time, the sealing ring, especially the sealing lip provided with the convex rib structure, also maintains a relatively high dynamic "pumping" ability for the sealing medium. In addition, the substantially streamlined closed area formed by the sealing ring can collect particles in, for example, oil, effectively blocking the particles from entering, for example, the inside of the bearing.

[0014] In some advantageous embodiments, the convex rib structure is formed by the elastomer that makes up the sealing lip. Herein, the elastomer that constitutes the sealing lip is preferably rubber.

[0015] In some advantageous embodiments, an anti-wear layer is provided at the first sealing inclined surface of the sealing lip, and the convex rib structure is formed by the anti-wear material that makes up the anti-wear layer. Herein, the anti-wear layer with the convex rib structure can extend the service life of the sealing ring and optimize the dynamic and static sealing performance of the sealing ring.

[0016] In some preferred embodiments, the sealing ring is at least configured with a first sealing lip on the first axial side and a second sealing lip on the second axial side, wherein a convex rib structure is configured at the first sealing inclined surface of the second sealing lip. In this embodiment, the first sealing lip is used as the main lip, for example, and the second sealing lip is used as the anti-particle lip, for example. Herein, it is preferred to provide the convex rib structure at the anti-particle lip, thereby blocking at a position closer to the sealing medium with particles. Within the scope of this article, the number of sealing lips of the sealing ring is not limited. In addition to the above two sealing lips, the sealing ring can also have other sealing lips.

[0017] Herein, additionally and preferably, a convex rib structure is also configured at the first sealing inclined surface of the first sealing lip. Herein, convex rib structures are provided at the first sealing inclined surfaces of the first sealing lip and the second sealing lip respectively to enhance the sealing performance of the sealing ring.

[0018] In some preferred embodiments, the convex rib structure extends from the edge of the first sealing inclined surface towards the first axial side. In this case, the convex rib structure can be arranged close to the lip edge of the sealing lip. When the sealing ring is assembled, the sealing lip presses against the rotating component, and at this time, the convex rib structure can at least partially abut against the rotating component, thereby being beneficial to enhancing the dynamic and static sealing performance of the sealing ring.

[0019] In some preferred embodiments, the sealing ring further includes a skeleton for supporting the sealing ring. Herein, the elastomer of the sealing ring at least partially wraps the skeleton, thereby being beneficial to the fixation of the sealing ring and the dynamic sealing of the supporting elastomer relative to the rotating component.

[0020] In some preferred embodiments, the sealing ring further includes a spring ring to press the sealing lip of the sealing ring against the rotating component. To this end, an annular groove for accommodating the spring ring can be provided on the corresponding sealing lip, particularly the sealing lip used to achieve a contact seal. This enhances the sealing force of the sealing lip and achieves a reliable fluid seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features, advantages and technical effects of the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0022] Figure 1 is a three-dimensional partial cross-sectional view of the sealing ring according to the first embodiment,

[0023] Figure 2 is based on Figure 1 An enlarged partial cross-sectional view of the sealing ring,

[0024] Figure 3 is a partial cross-sectional view of a three-dimensional seal ring according to a second embodiment, and

[0025] Figure 4 FIG. 1 is a perspective partial cross-sectional view of a sealing ring according to a third embodiment. DETAILED DESCRIPTION

[0026] Figure 1 A partial cross-sectional view of a seal ring 101 according to a first embodiment is shown. The seal ring 101 according to this embodiment can be arranged on the output side of an electric wheel hub or electric shaft drive system, particularly between the outer and inner rings of a bearing, thereby achieving a dynamic seal axially between a first axial side A and a second circumferential side B. Here, the first axial side A points toward the grease area within the bearing, while the second axial side B points toward the oil area within the gearbox.

[0027] Especially Figure 1 As shown in the cross section of the sealing ring 101 in FIG, the sealing ring 101 includes a skeleton 1 made in particular of metal, an elastomer 2 made in particular of rubber, and a spring ring 3, wherein the elastomer 2 at least partially covers the skeleton 1 for supporting the sealing ring 101.

[0028] The sealing ring 101 has sealing lips made of an elastomer 2 on its radially inner side, namely, the first sealing lip 21 on the first axial side A and the second sealing lip 22 on the second axial side B. In this embodiment, the first sealing lip 21 serves as the main lip, and the second sealing lip 22 serves as the anti-particle lip. The first sealing lip 21 includes a first sealing inclined surface facing the first axial side A and a second sealing inclined surface facing the second axial side B. The second sealing lip 22 includes a first sealing inclined surface facing the first axial side A and a second sealing inclined surface facing the second axial side B. In this embodiment, the first sealing lip 21 and the second sealing lip 22 respectively abut against the rotating member, i.e., the inner ring of the bearing in this embodiment, with their respective first sealing inclined surfaces being able to slide relative to each other.

[0029] As Figure 1 shown, the sealing ring 101 further includes a spring ring 3. The spring ring 3 is arranged on the radially outer side of the first sealing lip 21, i.e., the main lip, by means of an annular receiving groove at the elastomer 2 to press the sealing lips of the sealing ring 101, especially the main lip, against the inner ring of the bearing.

[0030] According to this embodiment, a rib structure 211 is formed at the first sealing inclined surface of the first sealing lip 21, and a rib structure 221 is formed at the first sealing inclined surface of the second sealing lip 22.

[0031] As Figure 1 shown, the rib structure 211 at the first sealing lip 21 and the rib structure 221 at the second sealing lip 22 are constructed substantially the same in this embodiment. In other embodiments, the rib structures at different sealing lips can be constructed differently.

[0032] Returning to this embodiment, both the rib structures 211 and 221 include two rib lines, and the two rib lines are respectively closed in the circumferential direction. Here, the two rib lines respectively extend in a wavy shape in the circumferential direction. Preferably, the two rib lines are respectively in the shape of a sine wave and have a phase difference of 180° from each other. Especially referring to Figure 2 the enlarged partial cross-sectional view of the sealing ring 101 of the first embodiment shown, the two rib lines intersect with each other to form a plurality of closed regions distributed in the circumferential direction. Here, the plurality of closed regions have the same shape and are evenly distributed in the circumferential direction.

[0033] In other embodiments, the two rib lines forming the rib structures 211 and 221 can also extend in a zigzag shape in the circumferential direction, and the closed regions formed thereby can be in the shape of a polygon.

[0034] In this embodiment, as Figure 1As shown, the rib structure 211 extends from the edge of the first sealing inclined surface of the first sealing lip 21 towards the first axial side A. Similarly, the rib structure 221 extends from the edge of the first sealing inclined surface of the second sealing lip 22 towards the first axial side A. In this case, the rib structures 211 and 221 can be arranged close to the lip edges of the corresponding sealing lips 21 and 22. When the sealing ring 101 is assembled, the sealing lips 21 and 22 are pressed against the rotating component, i.e., the inner ring of the bearing. At this time, the rib structures can at least partially abut against the inner ring of the bearing, thereby facilitating the enhancement of the dynamic and static sealing performance of the sealing ring.

[0035] Figure 3 A three-dimensional partial cross-sectional view of the sealing ring 102 according to the second embodiment is shown. In the second embodiment, the structure of the sealing ring 102 is generally similar to that of the sealing ring 101 in the first embodiment. The main difference between the two is that a rib structure 221 is provided only on the first sealing inclined surface of the second sealing lip 22, i.e., the anti-particle lip, while no rib structure is provided on the first sealing inclined surface of the first sealing lip 21. The structure of the rib structure 221 can refer to the first embodiment.

[0036] Figure 4 A three-dimensional partial cross-sectional view of the sealing ring 103 according to the third embodiment is shown. In the third embodiment, the structure of the sealing ring 103 is generally similar to that of the sealing ring 101 in the first embodiment. The main difference between the two is that wear-resistant layers 4 are provided on both the first sealing lip 21, i.e., the main lip, and the second sealing lip 22, i.e., the anti-particle lip. The wear-resistant layer 4 covers at least the first sealing inclined surfaces of the first sealing lip 21 and the second sealing lip 22. In this embodiment, as Figure 4 shown, the wear-resistant layer 4 covers the first sealing inclined surface, the second inclined surface of the first sealing lip 21, and the first sealing inclined surface of the second sealing lip 22. Here, the wear-resistant layer 4 is made of a material such as polytetrafluoroethylene (PTFE), for example. In this embodiment, a rib structure 41 is formed by the wear-resistant layer 4 at the first sealing inclined surface of the first sealing lip 21, and a rib structure 42 is formed by the wear-resistant layer 4 at the first sealing inclined surface of the second sealing lip 22. The structures of the rib structures 41 and 42 can refer to the first embodiment.

[0037] Thus, by means of the rib structure of the above embodiments, the sealing rings 101, 102, and 103 can efficiently form a rib structure that is closed in the circumferential direction, which can avoid the risk of leakage from the gap between the head and tail ends of the rib in the existing solutions, thereby optimizing the static sealing performance of the sealing ring. At the same time, especially for the dynamic sealing performance, on the one hand, the sealing lips of the sealing rings 101, 102, and 103 also maintain a high "pumping" ability for the dynamic sealing medium; on the other hand, since a closed area is formed in the rib structure, a certain amount of oil can be stored in the closed area, which can improve the lubrication conditions of the sealing lips, facilitate the more stable dynamic sealing, improve the sealing effect, and even extend the service life of the sealing ring and the bearing.

[0038] In addition, especially referring to Figure 2 , the closed areas formed by the sealing rings 101, 102, and 103, especially the substantially streamlined closed areas, can collect particles in, for example, the oil, and effectively block the particles from entering, for example, the inside of the bearing. In addition, the rib structure according to the above embodiments can especially adapt to the working conditions of rotating components, such as the bidirectional rotation of the inner ring of the bearing.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention. In the description of the present invention, it should be noted that the ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] List of reference numerals

[0041] 101 Sealing ring

[0042] 1 Skeleton

[0043] 2 Elastomer

[0044] 21 First sealing lip

[0045] 211 Rib structure

[0046] 22 Second sealing lip

[0047] 221 Rib structure

[0048] 3 Spring ring

[0049] 102 Sealing ring

[0050] 103 Sealing Ring

[0051] 4 Anti-wear Layer

[0052] 41 Rib Structure

[0053] 42 Rib Structure

[0054] A First Axial Side

[0055] B Second Axial Side

Claims

1. Sealing rings (101, 102, 103), the sealing rings having sealing lips (21, 22) made of elastomer on their radially inner sides, wherein, The sealing lip can be slidably abutted against the rotating component to form a dynamic seal between the first axial side (A) and the second axial side (B). Wherein, the sealing lips (21, 22) include a first sealing inclined surface facing the first axial side (A) and a second sealing inclined surface facing the second axial side (B), and a rib structure (211, 221, 41, 42) is formed at the first sealing inclined surface. It is characterized in that the rib structure includes two rib lines, wherein the two rib lines respectively extend in a wavy or broken line shape along the circumferential direction and are respectively closed in the circumferential direction, and the two rib lines intersect with each other to form a plurality of closed regions distributed in the circumferential direction.

2. The sealing ring according to claim 1, wherein, The plurality of closed regions have the same shape and are evenly distributed along the circumferential direction.

3. The sealing ring according to claim 2, wherein, The two rib lines are respectively in the shape of a sine wave and have a phase difference of 180° from each other.

4. The sealing ring according to any one of claims 1 to 3, wherein, The rib structure is formed by the elastomer making up the sealing lip.

5. The sealing ring according to any one of claims 1 to 3, wherein, An anti-wear layer (4) is provided at the first sealing inclined surface of the sealing lip, and the rib structure is formed by the material making up the anti-wear layer (4).

6. The sealing ring according to claim 1, wherein The sealing ring is at least configured with a first sealing lip on the first axial side (A) and a second sealing lip on the second axial side (B), wherein the rib structure is formed at the first sealing inclined surface of the second sealing lip.

7. The sealing ring according to claim 6, wherein The rib structure is formed at the first sealing inclined surface of the first sealing lip.

8. The sealing ring according to claim 1, wherein, The rib structure extends from the edge of the first sealing inclined surface towards the first axial side (A).

9. The sealing ring according to claim 1, wherein, The sealing ring (101, 102, 103) further includes a skeleton (1) for supporting the sealing ring (101, 102, 103).

10. The sealing ring according to claim 1, wherein, The sealing ring (101, 102, 103) further includes a spring ring (3) to press the sealing lip of the sealing ring (101, 102, 103) against the rotating component.

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