Sealing ring

Abstract

The utility model relates to a sealing ring, which comprises a framework (31), a sealing ring (32) and a sealing ring (32), the elastic body (32) at least partially covers the framework (31), the elastic body (32) at least partially covers the framework (31), the elastic body (32) is provided with a main body part (323) and a first sealing lip (322), the main body part (323) extends from the radial inner side end of the framework (31), the first sealing lip (322) is formed by obliquely extending from the radial inner side of the main body part (323) to a first axial side (B), and the first sealing lip (322) extends from the radial inner side of the main body part (323) to a second axial side (B). The first sealing lip (322) can abut against the rotating part (20) in a relative sliding mode so as to form dynamic sealing, the elastic body (32) is further provided with a plurality of rib plates (325) distributed in the circumferential direction, and the rib plates (325) are connected between the axial end, facing the first axial side (B), of the main body part (323) and the radial outer side end of the first sealing lip (322).

Description

Technical Field

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

[0002] Lip seals for rotating shafts are widely used to seal rotating parts of various mechanical equipment. This is particularly true in environments where the sealing medium contains particles, such as in the sealing area of ​​truck wheel hub bearings or in the output-side sealing area of ​​electric wheel hubs or electric shaft drive systems. The seals are used to isolate the grease inside the bearing from the oil in the gearbox.

[0003] Currently, a typical seal ring can be used in this scenario. It is fixed to the bearing outer ring and has a particle barrier lip located radially inward on the transmission side. This particle barrier lip is in dynamic contact with the bearing inner ring to isolate the transmission oil and metal debris. However, especially when there is high pressure on the transmission side, this particle barrier lip often loses dynamic contact with the bearing inner ring, causing the seal ring to leak. Particles in the oil can then penetrate the sealing lip, causing damage to the sealing lip and even the interior of the bearing. Utility Model Content

[0004] Therefore, the purpose of the present invention is to provide a sealing ring mainly used for dynamic sealing, which can effectively isolate the medium containing more particles on the axial side, especially when there is a large pressure on the axial side.

[0005] According to the present invention, the above-mentioned object is achieved by a sealing ring. The sealing ring comprises: a frame having an overall annular disc-shaped section; an elastomer at least partially covering the frame, and the elastomer is configured with a main body and a first sealing lip, wherein the main body extends from a radially inner end of the frame, wherein the first sealing lip extends obliquely from the radial inner side of the main body toward a first axial side, and the first sealing lip is capable of slidably abutting against a rotating component to form a dynamic seal, wherein the elastomer further comprises a plurality of ribs distributed along a circumferential direction, wherein the plurality of ribs are respectively connected between an axial end of the main body facing the first axial side and a radially outer end of the first sealing lip.

[0006] In the context of this document, sealing rings can be used, in particular, for dynamically sealing rotating components. In this case, the center axis of the sealing ring coincides with the axis of rotation of the rotating component. Unless otherwise specified, the terms "axial," "radial," and "circumferential" refer to the center axis of the sealing ring, i.e., the axis of rotation of the rotating component.

[0007] Preferably, the sealing ring is arranged between the outer and inner rings of the bearing. Alternatively, the sealing ring is arranged between a component, such as a housing, and a rotating member that can rotate relative to the component. The sealing ring is preferably directly or indirectly fixed to the outer ring or the component, such as the housing, so that when the rotating member rotates, the sealing ring rotates relative to the rotating member along with the component. The rotating member can be the inner ring of the bearing, or a shaft, a shaft section of a component, or another component fixed to the shaft or a shaft section of a component.

[0008] In particular, in embodiments where the sealing ring is mounted between the outer and inner rings of a bearing, the first axial side can preferably be the oil side within the transmission, and the second axial side, axially opposite the first axial side, can be the grease side within the bearing. In other embodiments, the first axial side can also face other media containing particles, such as sewage.

[0009] With the provided sealing ring, particularly when there is high pressure on the first axial side, such as the transmission fluid side, multiple ribs distributed along the circumference can apply a radially inward force to the first sealing lip, such as the particle protection lip. This prevents the free end of the first sealing lip from being forced up by ambient pressure, potentially breaking dynamic contact with the rotating component and causing leakage. It also prevents locations near the main body of the first sealing lip, such as the narrow portion, from improperly contacting the inner ring. In other words, the multiple ribs ensure the stability of the dynamic contact between the free end of the first sealing lip and the inner ring. Furthermore, when the sealing ring rotates relative to the rotating component, the ribs act like fan blades, sweeping or blowing media near the sealing lip, such as oil and particles, away from the sealing lip. This improves the overall sealing performance of the sealing ring and also increases its service life.

[0010] According to some preferred embodiments, the area of ​​the first sealing lip close to the main body is configured as a narrow portion. Here, the narrow portion is in the shape of a thin ring, thereby facilitating the assembly of the sealing ring.

[0011] According to some preferred embodiments, the ribs are evenly distributed along the circumferential direction, so that the radial force exerted by the ribs on the first sealing lip is more evenly distributed in the circumferential direction, and the ribs can clean the surrounding sealing medium over a larger circumferential range.

[0012] According to some preferred embodiments, the ribs are triangular in their natural state. This natural state specifically refers to the unassembled state of the sealing ring, or the state in which the first sealing lip does not interfere with the rotating component. This maximizes material savings while providing stable support for the first sealing lip. Furthermore, the ribs do not interfere with the normal operation of other components in relatively crowded installation environments.

[0013] Here, preferably, the ribs extend in corresponding radial planes, thereby being particularly adaptable to the working conditions of bidirectional rotation of the rotating component.

[0014] Here, preferably, in a natural state, a surface of the main body portion at an axial end portion thereof facing the first axial side extends substantially in a plane perpendicular to the axial direction.

[0015] Here, preferably, in a natural state, a surface of the radially outer end portion of the first sealing lip is substantially a cylindrical surface surrounding the rotation axis.

[0016] According to some preferred embodiments, the sealing ring further includes a second sealing lip extending radially inward from the radially inner side of the main body, and the second sealing lip is further away from the first axial side relative to the first sealing lip. In this embodiment, the second sealing lip serves as a main lip, for example, and the first sealing lip serves as a particle protection lip, for example. Within the scope of this document, the number of sealing lips of the sealing ring is not limited. In addition to the two sealing lips described above, the sealing ring may also have other sealing lips, which may or may not be in direct contact with the rotating component.

[0017] Here, the sealing ring preferably further comprises a spring ring, and the elastomer has a receiving groove formed radially outwardly on the main body portion for accommodating the spring ring, with the receiving groove being open radially outward. Preferably, the spring ring is arranged radially outwardly of the main body portion, corresponding to the second sealing lip. This allows additional radial force to be applied to the second sealing lip, thereby enhancing the sealing performance of the sealing ring, particularly at the second sealing lip.

[0018] Here, it is particularly advantageous that the ribs extend radially to the same radial height as the notch of the receiving groove. Thus, the ribs can enhance the groove wall strength of the receiving groove, and the groove wall thickness can be appropriately reduced, thereby saving material.

[0019] In some preferred embodiments, an anti-wear layer is provided on the radially inner surfaces of the first and second sealing lips. This anti-wear layer can extend the service life of the seal ring. The seal ring according to this embodiment can be used in harsher environments or where low friction is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Figure 1 is a partial axial cross-sectional view of the sealing ring according to the first embodiment,

[0022] Figure 2 is based on Figure 1 A partial three-dimensional cross-sectional view of the sealing ring, and

[0023] Figure 3 FIG. 1 is a partial axial cross-sectional view of a sealing ring according to a second embodiment. DETAILED DESCRIPTION

[0024] Figure 1 This is a partial axial cross-sectional view of a seal ring 30 according to the first embodiment. In this embodiment, the seal ring 30 is used to isolate the grease inside the bearing from the oil inside the transmission. Here, the seal ring 30 is positioned between the outer ring 10 and the inner ring 20 of the bearing. The first axial side B is the oil side inside the transmission, while the second axial side A is the grease side inside the bearing. In other embodiments, the first axial side can also face other media containing particles, such as sewage.

[0025] like Figure 1 As shown, according to this embodiment, the sealing ring 30 includes a skeleton 31 , an elastic body 32 and a spring ring 33 .

[0026] The skeleton 31 is made of metal, and has a section that is annular disc-shaped as a whole to mainly radially support the sealing ring 30. In addition, in this embodiment, the skeleton 31 also has a section that is sleeve-shaped as a whole to support the installation position.

[0027] The elastomer 32 is made of rubber, in particular, and at least partially covers the skeleton 31. The sealing ring 30 is mounted on the outer ring 10 of the bearing by means of a radially outer end portion formed by the elastomer 32 and the skeleton 31, in particular by a tight fit. The elastomer 32 is constructed with a main body 323, a first sealing lip 322 serving as a particle protection lip, and a second sealing lip 321 serving as a main lip. The main body 323 extends approximately radially inward from the radially inner end portion of the skeleton 31. The first sealing lip 322 and the second sealing lip 321 are respectively connected to the radially inner end portion of the main body 323. Specifically, the first sealing lip 322 is formed to extend obliquely from the radial inner side of the main body 323 toward the first axial side B. See in particular Figure 1 The area of ​​the first sealing lip 322 near the main body 323 is configured as a narrow portion 326, which is thinner than the adjacent areas on either side. The second sealing lip 321 extends radially inward from the radially inner side of the main body 323. The first sealing lip 322 is formed on the first axial side B, and the second sealing lip 321 is formed on the second axial side A. The first and second sealing lips 322, 321 slidably contact the outer circumferential surface of the bearing inner ring 20, forming a dynamic seal between the first and second axial sides B and A.

[0028] Figure 2 is based on Figure 1 Part of the three-dimensional cross-sectional view of the sealing ring 30. See in particular Figure 1 and Figure 2The elastic body 32 also has a plurality of ribs 325 distributed along the circumference. The ribs 325 are connected between the axial end of the main body 323 facing the first axial side B and the radially outer end of the first sealing lip 322. Therefore, particularly when there is a high pressure on the first axial side B, such as the transmission fluid side, the circumferentially distributed ribs 325 can apply a radially inward force to the first sealing lip 322. This prevents the free end of the first sealing lip 322 from being forced up by ambient pressure, resulting in loss of dynamic contact with the inner ring 20 and causing leakage. Furthermore, it prevents locations of the first sealing lip 322 near the main body 323, such as the narrow portion 326, from improperly contacting the inner ring 20. In other words, the ribs 325 ensure the stability of the dynamic contact between the free end of the first sealing lip 322 and the inner ring 20. At the same time, the ribs 325 act like fan blades when the sealing ring 30 rotates relative to the inner ring 20, sweeping or blowing media near the first sealing lip 322, such as oil and particles, away from the first sealing lip 322. In this embodiment, in its natural state, the surface of the main body 323 at its axial end facing the first axial side B extends substantially in a plane perpendicular to the axial direction. In its natural state, the surface of the first sealing lip 322 at its radially outer end is substantially cylindrical, circumferentially circumferentially. The multiple ribs 325, evenly distributed along the circumference, form a triangular shape in their natural state, or when not interfering with rotating components, and in this case, are substantially right-angled triangles. This maximizes material savings while providing stable support for the first sealing lip 322. Furthermore, the provision of the ribs 325 does not interfere with the normal operation of other components, even in relatively crowded installation environments. Preferably, the ribs 325 extend in corresponding radial planes, making them particularly suitable for bidirectional rotation of rotating components.

[0029] like Figure 1 As shown, the spring ring 33 is arranged radially outward of the main body 323, specifically at the axial position corresponding to the second sealing lip 321. This allows additional radial force to be applied to the second sealing lip 321, enhancing the sealing performance of the sealing ring 30, particularly at the second sealing lip 321. The elastomer 32 has a receiving groove 324 formed in the main body 323 for accommodating the spring ring 33. The receiving groove 324 is open radially outward. Ribs 325 extend radially to the same radial height as the notch of the receiving groove 324. As a result, the ribs 325 enhance the strength of the receiving groove wall.

[0030] It can be seen that the sealing performance of the sealing ring provided according to this embodiment is improved overall and the service life can also be increased.

[0031] Figure 3FIG. 1 is a partial axial cross-sectional view of a sealing ring 30 according to a second embodiment. In the second embodiment, the sealing ring 30 is generally similar in structure to the sealing ring in the first embodiment. The main difference between the two is that an anti-wear layer 34 is provided on both the second sealing lip 321, also known as the main lip, and the first sealing lip 322, also known as the particle protection lip. The anti-wear layer 34 is made of a material such as polytetrafluoroethylene (PTFE). The anti-wear layer 34 is connected to the elastomer 32 forming the second sealing lip 321 and the first sealing lip 322, for example, through a vulcanization process. In this embodiment, the anti-wear layer 34 covers at least the first sealing bevel of the second sealing lip 321 facing the second axial side A, the second sealing bevel facing the first axial side B, and the first sealing bevel of the first sealing lip 322 facing the second axial side A. The sealing ring 30 according to this embodiment can be used in environments with more severe working conditions or in situations where the sealing ring 30 is required to have lower friction.

[0032] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled 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 methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention. In the description of the present invention, it should be noted that the terms "first", "second" and other ordinal numbers are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] Reference Signs List

[0034] 10 bearing outer ring

[0035] 20 Bearing inner ring, rotating part

[0036] 30 sealing ring

[0037] 31 Skeleton

[0038] 32 Elastomer

[0039] 321 Second sealing lip

[0040] 322 first sealing lip

[0041] 323 Main body

[0042] 324 storage tank

[0043] 325 ribs

[0044] 326 Narrow

[0045] 33 Spring Coil

[0046] 34 Anti-wear layer

[0047] A Second axial side, grease side

[0048] B First axial side, oil side

Claims

1. Sealing ring (30), including: a skeleton (31) having a segment that is generally annular and disc-shaped; an elastic body (32) at least partially covering the skeleton (31), and the elastic body (32) is configured with a main body portion (323) and a first sealing lip (322), The main body (323) extends from the radial inner end of the frame (31). The first sealing lip (322) is formed by obliquely extending from the radial inner side of the main body (323) toward the first axial side (B), wherein the first sealing lip (322) can abut against the rotating component (20) in a relatively slidable manner, thereby forming a dynamic seal. It is characterized in that the elastomer (32) is further formed with a plurality of ribs (325) distributed along the circumferential direction, and the plurality of ribs (325) are respectively connected between the axial end of the main body (323) facing the first axial side (B) and the radial outer end of the first sealing lip (322).

2. The sealing ring (30) according to claim 1, wherein: The area of ​​the first sealing lip (322) close to the main body portion (323) is configured as a narrow portion (326).

3. The sealing ring (30) according to claim 1, wherein: The plurality of ribs (325) are evenly distributed along the circumferential direction.

4. The sealing ring (30) according to claim 1, wherein: The ribs (325) are triangular in shape as a whole in a natural state.

5. The sealing ring (30) according to claim 4, wherein: The ribs (325) each extend in a corresponding radial plane.

6. The sealing ring (30) according to claim 4, wherein: In a natural state, the surface of the main body portion (323) at its axial end portion facing the first axial side (B) extends substantially in a plane perpendicular to the axial direction, and / or In a natural state, the surface of the radially outer end portion of the first sealing lip (322) is substantially a cylindrical surface surrounding the rotation axis.

7. The sealing ring (30) according to claim 1, wherein: The sealing ring (30) further includes a second sealing lip (321), which is formed by extending radially inward from the radial inner side of the main body (323), and the second sealing lip (321) is away from the first axial side (B) relative to the first sealing lip (322).

8. The sealing ring (30) according to claim 7, wherein: The sealing ring (30) further comprises a spring ring (33), wherein the elastic body (32) is formed with a receiving groove (324) for receiving the spring ring (33) on the radially outer side of the main body (323), and the receiving groove (324) is open toward the radially outer side.

9. The sealing ring (30) according to claim 8, wherein: The rib (325) extends radially to the same radial height as the notch of the accommodating groove (324).

10. The sealing ring (30) according to claim 7, wherein: An anti-wear layer (34) is provided on the radial inner surfaces of the first sealing lip (322) and the second sealing lip (321).

Images