Dynamic sealing assembly and wheel bearing

Abstract

The utility model relates to a dynamic sealing assembly and a wheel bearing, a sealing piece comprises a framework, and the outer wall of the framework is wrapped with a first rubber layer; the outer wall of the oil slinger is wrapped with a second rubber layer; wherein a labyrinth type sealing gap is formed between the opposite surfaces of the first rubber layer and the second rubber layer, and honeycomb structures are arranged on the opposite surfaces of the first rubber layer and the second rubber layer. The labyrinth type sealing gap can effectively block external pollutants and accumulated water, good sealing performance is guaranteed, friction torque can be reduced as much as possible, energy loss caused by friction is reduced, and low friction performance and high sealing performance of a sealing piece are improved. When the sealing piece is static, the honeycomb structure can block and collect muddy water and keep the muddy water for a period of time, so that the muddy water is prevented from intruding into the sealing piece. When the sealing piece rotates, the honeycomb structure guides muddy water to flow out of the sealing piece by means of the splashing effect of centrifugal force and splashing force.

Description

Technical Field

[0001] The invention relates to the technical field of wheel bearing sealing, and in particular to a dynamic sealing component and a wheel bearing. Background Art

[0002] In related technologies, such as Figure 1 , the structure of a conventional cassette seal assembly is shown, which is composed of a frame 10, a rubber 50 and an oil slinger 20, wherein the rubber 50 is wrapped around the outside of the frame 10. The rubber 50 is provided with sealing lips such as a dust lip 51, a main lip 52 and a centrifugal lip 53. This cassette seal can be used to prevent pollutants such as dust and impurities and muddy water from invading the wheel bearing, ensuring the cleanliness and normal operation of the bearing.

[0003] However, in order to achieve a better sealing effect, this cassette seal usually needs to be designed with a larger interference between the sealing lip and the contact surface of the oil slinger, or more sealing lips need to be added to ensure the sealing effect of the cassette seal and prevent the intrusion of external pollutants and muddy water.

[0004] Although this design can increase the sealing effect of the seal, due to the large interference between the contact surface of the sealing lip and the oil slinger, this traditional box seal has a very large sealing friction torque, which makes the friction between the contact surface of the sealing lip and the oil slinger very large. This high friction state will not only consume a lot of energy, resulting in reduced bearing efficiency, but also accelerate the wear rate of the sealing lip, seriously affecting the service life of the seal. Frequent wear and high replacement frequency not only increase the cost of operation and maintenance, but also have an adverse effect on the overall operating stability of the equipment. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a dynamic sealing assembly and a wheel bearing.

[0006] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a dynamic sealing assembly, comprising: a skeleton, an outer wall of which is wrapped with a first rubber layer; and an oil slinger, an outer wall of which is wrapped with a second rubber layer; wherein a labyrinth sealing gap is formed between opposite surfaces of the first rubber layer and the second rubber layer, and a honeycomb structure is provided on opposite surfaces of the first rubber layer and the second rubber layer.

[0007] In some embodiments, the first rubber layer is provided with a three-dimensional annular first bending surface, and the second rubber layer is provided with a three-dimensional annular second bending surface, and the second bending surface and the first bending surface are nested and spaced from each other to form the labyrinth sealing gap.

[0008] In some embodiments, the first bending surface and the second bending surface are rotation surfaces formed by rotating a fold line around an axis.

[0009] In some embodiments, the plane of the first bending surface and the plane of the second bending surface are both inclined surfaces inclined relative to a radial direction.

[0010] In some embodiments, the second rubber layer is provided with the honeycomb structure on the axial outer side of the oil slinger.

[0011] In some embodiments, the honeycomb structure is composed of a plurality of straight groove structures.

[0012] In some embodiments, the straight grooves of the honeycomb structure on the first rubber layer and the second rubber layer are inclined toward the radial outside.

[0013] In some embodiments, a contact lip is disposed at the radial inner side of the first rubber layer. The contact lip extends obliquely radially outward and abuts against the oil slinger in a dynamic sealing manner.

[0014] In some embodiments, the radial portion of the skeleton is located axially inside the radial portion of the oil slinger, and the radial portion of the skeleton radially overlaps with the radial portion of the oil slinger; the axial portion of the skeleton is located axially outside the radial portion of the skeleton, and axially covers the radial portion of the oil slinger.

[0015] According to a second aspect of an embodiment of the present disclosure, the present disclosure provides a wheel bearing, comprising: an inner ring; an outer ring; and a dynamic sealing assembly as described in the first aspect, wherein the skeleton is interference fit with the outer ring, and the oil slinger is interference fit with the inner ring.

[0016] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the labyrinth-type sealing gap can effectively block external pollutants and accumulated water, and while ensuring good sealing performance, the sealing gap can also reduce the friction torque as much as possible, reduce the energy loss caused by friction, and improve the low friction and high sealing performance of the seal. When the seal is stationary, the honeycomb structure can block the muddy water and prevent the muddy water from invading the seal, and can also collect the muddy water and keep it for a certain period of time. When the seal rotates, the honeycomb structure produces a splashing effect with the help of centrifugal force and splashing force, guiding the muddy water to flow out of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] Figure 1 is a cross-sectional view of a cassette seal in the related art;

[0019] Figure 2 is a cross-sectional view of a dynamic seal having a honeycomb structure according to an exemplary embodiment;

[0020] Figure 3 is a schematic diagram of a three-dimensional structure of a first rubber layer on a skeleton according to an exemplary embodiment;

[0021] Figure 4 The figure is a schematic diagram of the three-dimensional structure of a second rubber layer on an oil slinger according to an exemplary embodiment. DETAILED DESCRIPTION

[0022] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0023] According to an embodiment of the present disclosure, the dynamic seal assembly 100 is suitable for installation in a wheel bearing. Figures 2 to 4 In the figure, the dynamic flow paths of pollutants and muddy water according to the embodiments of the present disclosure are illustrated by arrows.

[0024] In the present disclosure, unless otherwise specified, the axial direction A, radial direction R and circumferential direction refer to the axial direction, radial direction and circumferential direction of the dynamic seal assembly 100, respectively; the axial outer side refers to the Figure 2 , Figure 3 and Figure 4 The right side in the figure, the axial inner side refers to Figure 2 , Figure 3 and Figure 4 The radially outer side refers to the side away from the central axis in the radial direction (such as Figure 2 The radial inner side refers to the side close to the central axis in the radial direction (such as Figure 2 The term "torsionally resistant connection" refers to a connection between two components that does not rotate relative to each other, which can be achieved by press fit (i.e., interference fit) or by forming the two components as one piece. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] In order to solve the above technical problems, the present disclosure provides a dynamic sealing assembly 100, such as Figure 2 As shown, the dynamic seal assembly 100 may include a frame 10 (eg Figure 3 As shown) and the oil slinger 20 (as shown Figure 4shown).

[0026] The material of the frame 10 and the slinger 20 can be the same, preferably made of metal material to ensure sufficient strength and rigidity to support the entire seal 100. The outer wall of the frame 10 is wrapped with a first rubber layer 11, and the outer wall of the slinger 20 is wrapped with a second rubber layer 21. The first rubber layer 11 and the second rubber layer 21 can be tightly combined with the surface of the frame 10 and the slinger 20 respectively through a vulcanization process to ensure the stability and sealing performance between the rubber layer and the metal parts.

[0027] The skeleton 10 and the slinger 20 are respectively provided with radial portions and axial portions, the axial portion 14 of the skeleton 10 is used for torsion-proof connection with the outer ring 300 of the wheel bearing, and the axial portion 23 of the slinger 20 is used for torsion-proof connection with the inner ring seal 100 of the wheel bearing. During the rotation of the vehicle bearing, the skeleton 10 and the first rubber layer 11 as a whole form relative rotation with the slinger 20 and the second rubber layer 21 in the circumferential direction.

[0028] A labyrinth sealing gap 30 is formed between the opposing surfaces of the first rubber layer 11 and the second rubber layer 21 , and a honeycomb structure 40 is provided on the opposing surfaces of the first rubber layer 11 and the second rubber layer 21 .

[0029] The labyrinth seal gap 30 can effectively block external pollutants and accumulated water, ensure good sealing performance, and reduce friction torque as much as possible, reduce energy loss caused by friction, and improve the low friction and high sealing performance of the seal 100. When the seal 100 is stationary, the honeycomb structure 40 can block muddy water and prevent muddy water from invading the seal 100, and can also collect and retain muddy water for a certain period of time. When the seal 100 rotates, the honeycomb structure 40 generates a splash effect with the help of centrifugal force and splash force, guiding the muddy water to flow out of the seal 100.

[0030] Furthermore, the honeycomb structure 40 is composed of a plurality of straight groove structures. Figure 2 and Figure 3 As shown, these thin straight tubular structures are evenly distributed on the opposite surfaces of the first rubber layer 11 and the second rubber layer 21, and together form a honeycomb-like three-dimensional structure.

[0031] When the seal 100 is in a stationary state, if external pollutants or muddy water try to penetrate through the labyrinth sealing gap 30, the honeycomb structure 40 can play an important role. They can not only effectively block the further penetration of pollutants or muddy water, but also temporarily store these foreign objects in their own pores or groove structures.

[0032] When the seal 100 starts to rotate, the honeycomb structure 40, by virtue of its own slender and straight characteristics and the centrifugal force, can more effectively discharge the pollutants or muddy water previously stored in the honeycomb structure 40 into the labyrinth seal gap 30, and then discharge the pollutants or muddy water from the seal gap 30 to the seal 100, thereby achieving an efficient self-cleaning function and ensuring that the seal 100 always maintains good sealing performance and low friction characteristics during long-term use. This design not only increases the service life of the seal 100, but also reduces maintenance costs and improves overall use efficiency.

[0033] The honeycomb structure 40 may be a circular elongated hole or a hexagonal elongated hole, and the structure of the honeycomb structure 40 is not specifically limited here.

[0034] Furthermore, the radial portion of the skeleton 10 is located axially inside the radial portion 24 of the oil slinger 20, and R overlaps with the radial portion 24 of the oil slinger 20 in the radial direction R. The axial portion 14 of the skeleton 10 is located axially outside the radial portion 15 of the skeleton 10, and axially covers the radial portion 24 of the oil slinger 20. Thus, a sealing gap 30 in a generally G-shaped shape is formed between the skeleton 10 and the oil slinger 20, and the opening 31 of the sealing gap 30 is arranged toward the axial outside of the seal 100 and close to the radial outside of the seal 100.

[0035] Since the opening 31 of the labyrinth seal gap 30 faces the axial outer side and is close to the radial outer side, pollutants and muddy water are effectively prevented from invading the interior of the seal 100 from the radial and axial directions, and pollutants and muddy water accumulated on the radial inner side are also prevented from entering the seal gap 30. During the rotation of the seal 100, pollutants and muddy water that have entered the seal gap 30 will be quickly discharged along the direction of the opening 31 under the action of centrifugal force (which can also be understood as inertial force), thereby improving the self-cleaning ability and service life of the seal 100, and further ensuring the good working condition and low maintenance cost of the wheel bearing.

[0036] Furthermore, since the dynamic sealing assembly 100 is an annular structure, the first rubber layer 11 and the second rubber layer 21 are also annular structures. The first rubber layer 11 is provided with a three-dimensional annular first bending surface 12, and the second rubber layer 21 is provided with a three-dimensional annular second bending surface 22. The second bending surface 22 and the first bending surface 12 are nested and spaced from each other to form a labyrinth sealing gap 30.

[0037] Among them, the labyrinth sealing gap 30 formed by the first bending surface 12 and the second bending surface 22 can be generally extended along the axial direction A, that is, the first bending surface 12 and the second bending surface 22 are nested in the radial direction R, or can be extended radially, that is, the first bending surface 12 and the second bending surface 22 are nested in the axial direction A.

[0038] In this embodiment, since the spacing between the axial portion 14 of the skeleton 10 and the axial portion 23 of the oil slinger 20 is larger than the spacing between the radial portions of the two, the formed labyrinth seal gap 30 generally extends in the radial direction R, and the first bending surface 12 and the second bending surface 22 are mutually nested along the axial direction A. The labyrinth seal gap 30 extending in the radial direction R is not only compact in structure in the axial direction A, reducing the size occupied in the axial direction A, but also better blocking pollutants and muddy water coming from the axial direction A. At the same time, the design of the labyrinth seal gap 30 extending in the radial direction R realizes effective interception and storage of pollutants or muddy water in a static state.

[0039] In addition, the labyrinth seal gap 30 extending substantially in the radial direction R is matched with the labyrinth seal gap 30 having an opening 31 facing the axial outside, so that once pollutants and muddy water accidentally enter the seal gap 30, the centrifugal force can be fully utilized to easily discharge these substances from the axial outside opening 31 when the seal 100 rotates. The ability of the seal 100 to resist the intrusion of pollutants is greatly improved, and the self-cleaning ability of the seal 100 is also optimized, further enhancing the service life and low friction and high performance characteristics of the seal 100.

[0040] In some embodiments, the three-dimensional annular first bending surface 12 and the second bending surface 22 can be a three-dimensional rotating surface formed by rotating a fold line around the central axis. The fold line forming the three-dimensional rotating surface can be a continuous curve or a straight line connected by continuous bends. In this embodiment, the fold line can be composed of multiple planes, and the plane is more conducive to the discharge of pollutants and muddy water under the action of centrifugal force.

[0041] Since the tortuous path formed by the planes reduces the resistance to the discharge of pollutants or muddy water, when the seal 100 rotates, the centrifugal force can more effectively guide the pollutants and muddy water to pass through the labyrinth sealing gap 30 radially and flow axially outward from the opening 31 of the labyrinth sealing gap 30, thereby avoiding the accumulation of pollutants inside the seal 100 and improving the self-cleaning ability of the seal 100 and the overall sealing performance.

[0042] In some embodiments, the first bending surface 12 and the second bending surface 22 may form a sawtooth structure, that is, the multiple planes constituting the first bending surface 12 (or the second bending surface 22) are connected at right angles.

[0043] In this embodiment, the plane of the first bending surface 12 and the plane of the second bending surface 22 are both inclined surfaces inclined radially outward. Figure 2As shown, the cross-sectional profile of the first bending surface 12 and the second bending surface 22 is generally trapezoidal. This inclined trapezoidal structure can significantly reduce the resistance of pollutants and muddy water during the discharge process, thereby being more conducive to the pollutants and muddy water being quickly and effectively discharged from the opening 31 of the labyrinth sealing gap 30 to the outside of the seal 100 under the action of centrifugal force.

[0044] In addition, in this embodiment, the first rubber layer 11 is specifically a structural style of a protrusion with two concave parts, and the second rubber layer 21 matches it, with two protrusions and one concave part. Such a staggered structure further enhances the blocking effect of the labyrinth seal gap 30, making it more difficult for pollutants and muddy water to pass through the seal gap 30, and at the same time, it is more conducive to the discharge of particles that have entered under the action of centrifugal force.

[0045] In other embodiments, the number of bends of the labyrinth seal gap 30 can be flexibly adjusted according to actual application requirements, that is, the complexity of the bends of the seal gap 30 can be increased or decreased according to design requirements. This is not limited to a specific number in this embodiment, in order to emphasize the adaptability and flexibility of the utility model to meet the sealing performance and low friction requirements in different scenarios.

[0046] Further, it can be known from the above contents that, since the labyrinth seal gap 30 generally extends along the radial direction R, and is convenient for collecting pollutants or muddy water in a stationary state, and for discharging pollutants or muddy water in a moving state, the opening 41 of the honeycomb structure 40 of the first rubber layer 11 is open in the radial direction outward, and specifically, the opening 41 of the honeycomb structure 40 of the first rubber layer 11 is inclined in the radial direction outward and in the axial direction outward. At the same time, the opening 41 of the honeycomb structure 40 of the second rubber layer 21 is open in the radial direction outward, further enhancing the drainage effect of the labyrinth seal channel, so that the seal 100 disclosed in the present invention can have excellent anti-fouling and self-cleaning functions while ensuring low friction and high performance, thereby significantly improving the reliability and service life of the seal 100 under complex working conditions.

[0047] In some embodiments, Figure 2 and Figure 4 As shown, the second rubber layer 21 of the oil slinger 20 located on the axial outer side is evenly distributed with honeycomb structures 40 .

[0048] By setting the honeycomb structure 40, the oil slinger 20 can also more effectively block the intrusion of pollutants and muddy water on the axial outside, and during the operation of the vehicle, the pollutants and muddy water that have entered can be discharged to the outside of the seal 100 through the pores of the honeycomb structure 40 with the help of centrifugal force. Not only the anti-fouling performance of the seal 100 is enhanced, and the possibility of accumulation of pollutants inside the seal 100 is reduced, but also the special shape of the honeycomb structure 40 can reduce friction, thereby maintaining the low friction performance and high-efficiency sealing performance of the entire seal 100, and further improving the service life and working reliability of the entire sealing assembly.

[0049] In some embodiments, a contact lip 13 is provided on the radial inner side of the first rubber layer 11. Figure 2 As shown, the contact lip 13 extends obliquely radially outward and abuts against the contact surface of the oil slinger 20 in a dynamic sealing manner.

[0050] In this embodiment, the contact lip 13 is located on the radial inner side of the first rubber layer 11, and the contact lip 13 and the contact surface of the oil slinger 20 are interference fit along the axial direction A. The contact lip 13 is the only structure of the first rubber layer 11 that abuts against the oil slinger 20, so that the friction torque between the first rubber layer 11 and the second rubber layer 21 can be reduced.

[0051] The contact lip 13 extends radially outwardly and dynamically seals against the contact surface of the oil slinger 20, which can provide a final protection for the pollution and muddy water entering the labyrinth seal gap 30, and completely prevent the pollution and muddy water from entering the wheel bearing. This shape and structure is also conducive to throwing the pollution and muddy water stored there to the labyrinth seal gap 30 under the action of centrifugal force and discharging them from the opening 31 of the labyrinth seal gap 30.

[0052] Based on the same inventive concept, the present disclosure also provides a wheel bearing, comprising: an inner ring 200 , an outer ring and the above-mentioned dynamic seal 100 with a honeycomb structure 40 , wherein the skeleton 10 is interference fit with the outer ring, and the oil slinger 20 is interference fit with the inner ring 200 .

[0053] The specific manner in which the functions implemented in the wheel bearing in the above-mentioned embodiment are implemented has been described in detail in the embodiment of the dynamic seal 100 and will not be elaborated on here.

[0054] It is further understood that the terms "first", "second", etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first rubber layer 11 can also be referred to as the second rubber layer 21, and similarly, the second rubber layer 21 can also be referred to as the first rubber layer 11.

[0055] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0056] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A dynamic sealing assembly (100), characterized in that: include: A frame (10), wherein the outer wall of the frame (10) is wrapped with a first rubber layer (11); as well as An oil slinger (20), wherein the outer wall of the oil slinger (20) is wrapped with a second rubber layer (21); A labyrinth sealing gap (30) is formed between the opposing surfaces of the first rubber layer (11) and the second rubber layer (21), and a honeycomb structure (40) is provided on the opposing surfaces of the first rubber layer (11) and the second rubber layer (21).

2. The dynamic sealing assembly (100) according to claim 1, characterized in that: The first rubber layer (11) is provided with a three-dimensional annular first bending surface (12), and the second rubber layer (21) is provided with a three-dimensional annular second bending surface (22), and the second bending surface (22) and the first bending surface (12) are mutually nested and spaced apart to form the labyrinth sealing gap (30).

3. The dynamic sealing assembly (100) according to claim 2, characterized in that: The first bending surface (12) and the second bending surface (22) are rotating surfaces formed by rotating a fold line around an axis.

4. The dynamic sealing assembly (100) according to claim 3, characterized in that: The plane of the first bending surface (12) and the plane of the second bending surface (22) are both inclined surfaces inclined relative to the radial direction.

5. The dynamic sealing assembly (100) according to claim 1, characterized in that: The second rubber layer (21) is provided with the honeycomb structure (40) on the axially outer side of the oil slinger (20).

6. The dynamic sealing assembly (100) according to claim 1, characterized in that: The honeycomb structure (40) is composed of a plurality of straight groove structures.

7. The dynamic sealing assembly (100) according to claim 1, characterized in that: The straight grooves of the honeycomb structure (40) on the first rubber layer (11) and the second rubber layer (21) are both inclined radially outward.

8. The dynamic sealing assembly (100) according to claim 1, characterized in that: A contact lip is provided on the radial inner side of the first rubber layer (11), and the contact lip extends obliquely toward the radial outer side and abuts against the oil slinger (20) in a dynamic sealing manner.

9. The dynamic sealing assembly (100) according to claim 1, characterized in that: The radial portion (15) of the skeleton (10) is located axially inside the radial portion (24) of the oil slinger (20), and the radial portion (15) of the skeleton (10) overlaps with the radial portion (24) of the oil slinger (20) in the radial direction; The axial portion (14) of the skeleton (10) is located axially outside the radial portion (24) of the skeleton (10), and axially covers the radial portion (24) of the oil slinger (20).

10. A wheel bearing, characterized in that: include: Inner circle (200); an outer ring (300); and The dynamic sealing assembly (100) according to any one of claims 1 to 9, wherein the skeleton (10) and the outer ring (300) are interference fit, and the slinger (20) and the inner ring (200) are interference fit.

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