Bearing sealing assembly and rolling bearing

Abstract

The invention relates to a bearing sealing assembly and a rolling bearing. The bearing seal assembly includes: a frame including a first axial portion and a first radial portion; the sealing body is attached to the framework, the sealing body is provided with a main sealing lip and a centrifugal lip, and the main sealing lip and the centrifugal lip are located on the axial side of the first radial part of the framework; the check block ring is located on the axial side of the first radial part of the framework, the check block ring comprises a second axial part and a second radial part, the second axial part of the check block ring is in interference fit with the first axial part of the framework, and the second radial part of the check block ring abuts against the centrifugal lip. The check block ring and the framework are in interference fit and can rotate synchronously, so that the centrifugal lip and the check block ring do not rotate relatively, and extra friction torque generated when the centrifugal lip and the check block ring make contact is avoided. The second radial part of the stop dog ring reduces direct contact of most of oil and particulate matter with the main sealing lip, and the risk of sealing failure of the main sealing lip caused by oil and particulate pollution is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing in general industry and automotive field, and particularly relates to a bearing sealing assembly and a rolling bearing. BACKGROUND

[0002] Sealing assemblies at the output end of truck wheel bearings, e-Wheel and electric drive axle are generally used to seal the oil containing a large number of particles, and need to have the performance of achieving high-efficiency sealing under the condition of containing particle medium, so as to meet the higher sealing protection requirements.

[0003] Generally, the positions of the two axial ends of the bearing are respectively configured with sealing assemblies, and the sealing assembly on the other axial side is usually a box-type sealing assembly, which mainly prevents the invasion of impurities such as pollutants and mud from the external environment of the automobile wheel into the bearing interior, thereby effectively protecting the rolling bearing from erosion and damage. The sealing assembly on one axial side is usually an oil sealing assembly, which is mainly used to prevent the overflow of the lubricating grease inside the bearing cavity, and effectively prevent the gear box oil from entering the bearing cavity, so as to maintain the stability of the bearing lubrication system and the normal operation of the bearing itself.

[0004] Figure 1 An oil sealing assembly on one axial side of a truck hub bearing in the related art is shown, which is composed of a skeleton, a rubber sealing body, a spring, a main sealing lip and a dust lip. However, when the oil contains a certain amount of particles from the gear box or any other place, the main sealing lip 70 of this oil sealing assembly is easily worn by the particles and causes leakage.

[0005] In some embodiments, in order to improve the sealing performance, the box-type sealing assembly with a centrifugal lip (as shown in Figure 2 ) is used to replace the traditional oil sealing assembly on one axial side of the truck hub bearing. However, this change also causes new challenges. The dynamic sealing contact between the centrifugal lip 50 and the oil thrower 60 generates additional friction torque, especially when there is a large pressure difference between the gear box oil and the bearing cavity, for example, when the pressure difference is greater than 0.7 bar, the centrifugal lip 50 is easily pressed down by the pressure, thereby causing sealing failure and potential leakage problems. SUMMARY

[0006] In order to overcome the problems in the related art, the present disclosure provides a bearing sealing assembly and a rolling bearing.

[0007] According to a first aspect of embodiments of the present disclosure, the present disclosure provides a bearing seal assembly, comprising: a skeleton comprising a first axial portion and a first radial portion; a seal body attached to the skeleton, the seal body being provided with a main sealing lip and a centrifugal lip, the main sealing lip and the centrifugal lip being located on an axial side of the first radial portion of the skeleton; and a stop ring located on an axial side of the first radial portion of the skeleton, wherein the stop ring comprises a second axial portion and a second radial portion, the second axial portion of the stop ring is in interference fit with the first axial portion of the skeleton, and the second radial portion of the stop ring is in interference abutment with the centrifugal lip in a static state.

[0008] In some embodiments, the second radial portion of the stop ring is provided with a flow guide hole, the flow guide hole being located radially outward of the abutment position of the centrifugal lip and the second radial portion, and in a rotating state, the flow guide hole allows the centrifugal lip to be separated from the second radial portion of the stop ring.

[0009] In some embodiments, the second radial portion of the stop ring is provided with a plurality of flow guide holes arranged at equal intervals in the circumferential direction.

[0010] In some embodiments, the centrifugal lip is integrally formed with the main sealing lip, and the main sealing lip extends radially outward at an end away from the skeleton to form the centrifugal lip.

[0011] In some embodiments, a radial end portion of the main sealing lip is located radially inward of an end portion of the second radial portion of the stop ring.

[0012] In some embodiments, the second radial portion of the stop ring is located at an end of the second axial portion away from the skeleton.

[0013] In some embodiments, the seal body covers the entire axial other side of the first radial portion of the skeleton, and forms a seal head at a transition area between the first radial portion of the skeleton and the first axial portion.

[0014] In some embodiments, a transition area between the first radial portion and the first axial portion of the skeleton is provided with a chamfer portion, and the seal head is attached to the chamfer portion.

[0015] In some embodiments, the bearing seal assembly further comprises a spring, the spring being sleeved radially outward of the main sealing lip and pressing the main sealing lip radially.

[0016] According to a second aspect of embodiments of the present disclosure, the present disclosure provides a rolling bearing, comprising: an inner ring; an outer ring; and a bearing seal assembly as described in the first aspect, the skeleton being torsionally connected with the outer ring, and the seal body and the stop ring rotating with the outer ring along with the skeleton.

[0017] The technical scheme provided by the embodiment of the present disclosure can have the following beneficial effects: the second axial part of the block ring is in interference fit with the first axial part of the skeleton, which ensures that the block ring can rotate synchronously with the skeleton and the outer ring of the bearing, and thus the centrifugal lip and the block ring do not have relative rotation during operation, thereby avoiding additional friction torque generated when the two are in contact. In addition, the second radial part of the block ring reduces the opportunity for most of the oil and particulate matter to directly contact the main sealing lip, effectively reducing the risk of sealing failure of the main sealing lip caused by oil and particulate contamination, and improving the working state and sealing performance of the main sealing lip. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

[0019] Figure 1 is a sectional view of an oil seal assembly in the related art;

[0020] Figure 2 is a sectional view of a cartridge seal assembly that replaces the oil seal assembly in the related art;

[0021] Figure 3 is a sectional view of a bearing seal assembly according to an exemplary embodiment;

[0022] Figure 4 is a perspective view of a bearing seal assembly according to an exemplary embodiment. DETAILED DESCRIPTION

[0023] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, the same numbers refer to the same elements throughout the drawings, unless otherwise represented. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they only represent devices and methods consistent with some aspects of the present disclosure, as detailed in the appended claims.

[0024] In the present disclosure, unless otherwise specified, the axial direction, the radial direction, and the circumferential direction refer to the axial direction, the radial direction, and the circumferential direction of the rolling bearing, respectively; the one axial side refers to the right side (e.g., the side where the gear box is located) in Figure 1 、 Figure 2 and Figure 3 , and the other axial side refers to the left side (e.g., the external environment of the wheel) in Figure 1 、 Figure 2 and Figure 3 ; the radially outer side refers to the side (the upper side in Figure 3 ) that is away from the center axis in the radial direction, and the radially inner side refers to the side (the lower side in Figure 3The term "anti-rotation connection" means a connection between two elements in a manner that does not rotate relative to each other, which can be achieved via a press fit (i.e. an interference fit) or by integrally forming the two components in question. The specific meaning of the above term in the present application will be understood by a person of ordinary skill in the art depending on the specific case.

[0025] To solve the above technical problems, the present disclosure provides a bearing sealing assembly 100, as shown in Figure 3 The bearing sealing assembly 100 comprises a skeleton 10, a sealing body 20 and a stop ring 30.

[0026] The skeleton 10 comprises a first axial part 11 and a first radial part 12, and the first axial part 11 of the skeleton 10 is anti-rotation connected with the outer ring 300 of the bearing, so as to ensure that the skeleton 10 can rotate together with the outer ring 300 of the bearing.

[0027] The stop ring 30 is located on the axial side of the first radial part 12 of the skeleton 10, and in actual application, when the bearing sealing assembly 100 is located on the axial side of the entire rolling bearing, the stop ring 30 is located close to the gear box. The stop ring 30 comprises a second axial part 31 and a second radial part 32, and the radially outer side of the second axial part 31 of the stop ring 30 is anti-rotation connected with the radially inner side of the first axial part 11 of the skeleton 10. Therefore, the stop ring 30 and the skeleton 10 do not have relative movement in the circumferential W rotation, but rotate together with the skeleton 10 and the outer ring 300 of the rolling bearing.

[0028] The second radial part 32 of the stop ring 30 is spaced apart from the first radial part 12 of the skeleton 10 in the axial A direction, and together with the first axial part 11 of the skeleton 10 and the second axial part 31 of the stop ring 30 itself, it surrounds an internal space, i.e. an accommodation cavity.

[0029] The sealing body 20 is fixedly attached to the skeleton 10 through a vulcanization process, so the sealing body 20 rotates together with the skeleton 10 and the outer ring 300 of the rolling bearing. The sealing body 20 comprises at least a main sealing lip 21 and a centrifugal lip 22, wherein the main sealing lip 21 and the centrifugal lip 22 are located on the axial side of the first radial part 12 of the skeleton 10, and more specifically, the main sealing lip 21 is located on the radially inner side of the first radial part 12 of the skeleton 10, and at the same time, the main sealing lip 21 and the centrifugal lip 22 are located between the first radial part 12 of the skeleton 10 and the second radial part 32 of the stop ring 30 in the axial direction.

[0030] In actual work, the main sealing lip 21 forms a dynamic sealing contact with the inner ring 200 of the rolling bearing, effectively preventing the leakage of lubricating grease in the bearing cavity and the intrusion of oil in the gear box into the inside of the bearing cavity. As shown in Figure 3As shown, the radial end of the main sealing lip 21 is located radially inward of the end of the second radial portion 32 of the block ring 30, so that when the bearing sealing assembly 100 is assembled to the rolling bearing, the second radial portion 32 of the block ring 30 remains a certain radial gap with the outer wall of the inner ring 200 of the rolling bearing, which is beneficial to reduce the frictional contact between the block ring 30 and the bearing inner ring 200, and also can reduce the possibility of most of the gearbox oil and particulate matter directly contacting the main sealing lip 21, thereby effectively reducing the risk of sealing failure of the main sealing lip 21 due to oil and particulate pollution, and improving the working state and sealing performance of the main sealing lip 21.

[0031] When the bearing sealing assembly 100 is initially installed or the rolling bearing is in a static state, the centrifugal lip 22 will be in close contact with the second radial portion 32 of the block ring 30, that is, the centrifugal lip 22 will be compressed in the axial direction, further enhancing the sealing effect and effectively preventing impurities from entering the inside of the bearing cavity. In addition, it is known that the centrifugal lip 22 and the block ring 30 do not rotate relative to each other during operation, which avoids additional frictional torque generated by the contact between the two when the rolling bearing is in operation, ensuring the stability and reliability of the bearing sealing assembly 100 in operation.

[0032] At the same time, the centrifugal lip 22 abuts against the second radial portion 32 of the block ring 30, thereby dividing the containing cavity into a first chamber 41 and a second chamber 42. In this embodiment, the radial outer side of the centrifugal lip 22 is defined as the first chamber 41, and the radial inner side of the centrifugal lip 22 is defined as the second chamber 42. When the rolling bearing is in a static state, the first chamber 41 and the second chamber 42 are isolated under the action of the centrifugal lip 22.

[0033] Further, in this embodiment, the second radial portion 32 of the block ring 30 is provided with a flow guide hole 33, which is located radially outward of the contact position between the centrifugal lip 22 and the second radial portion 32 of the block ring 30, and the flow guide hole 33 axially penetrates the second radial portion 32 of the block ring 30, so that the first chamber 41 and the space inside the gearbox are in communication with each other. Due to the radial gap between the second radial portion 32 of the block ring 30 and the inner ring 200 of the rolling bearing, the second chamber 42 can also be in communication with the space inside the gearbox.

[0034] In this way, during the rotation of the rolling bearing, the flow guide hole 33 can effectively eliminate the pressure difference between the first chamber 41 and the second chamber 42. In this case, the flow guide hole 33 enables the centrifugal lip 22 to timely separate from the second radial portion 32 of the block ring 30 under the action of centrifugal force when the centrifugal lip 22 is affected by the pressure difference between the bearing cavity and the inside of the gearbox, thereby successfully avoiding the problem of the centrifugal lip 22 turning over due to excessive pressure difference, and ensuring the stability and efficiency of the bearing sealing assembly 100.

[0035] Further, during the rotation of the rolling bearing, although the second radial portion 32 of the block ring 30 can block the oil and the particulate impurities in the gearbox interior space, a small amount of oil or particulate impurities can still enter the second chamber 42 through the radial gap between the second radial portion 32 of the block ring 30 and the inner ring 200, which can affect the sealing performance of the main sealing lip 21.

[0036] To this end, in the present embodiment, the centrifugal lip 22 is designed to be inclined towards the radial outer side, and when the bearing outer ring 300 rotates at a high speed, the small amount of oil and particulate impurities originally stored in the second chamber 42 will move along the inclined centrifugal lip 22 under the action of centrifugal force, and finally be guided to the abutting position of the centrifugal lip 22 and the second radial portion 32 of the block ring 30, reducing the oil and particulate impurities at the main sealing lip 21, thereby effectively protecting the main sealing lip 21.

[0037] At the same time, the abutting position of the centrifugal lip 22 and the second radial portion 32 of the block ring 30 corresponds to a one-way valve, allowing the oil and particulate impurities to flow from the second chamber 42 to the first chamber 41, but not allowing the substances in the first chamber 41 to flow reversely into the second chamber 42, so that, as shown in Figure 4 During the rotation of the rolling bearing, the oil and particulate impurities accumulated at the centrifugal lip 22 and the second radial portion 32 of the block ring 30 can be discharged in time through the flow guide hole 33, thereby further reducing the possibility of affecting the main sealing lip 21 by the particulate impurities, more effectively protecting the main sealing lip 21, and maintaining good sealing performance.

[0038] In addition, under the action of centrifugal force, the flow guide hole 33 connected with the first chamber 41 can also guide the oil and particulate impurities flowing from the second chamber 42 to the first chamber 41 back to the gearbox interior when the bearing rotates at a high speed, which helps to effectively prevent the accumulation of oil and particulate impurities in the first chamber 41, thereby maintaining the cleanliness of the first chamber 41 and further enhancing the stability and durability of the entire bearing sealing assembly 100.

[0039] In the present embodiment, the second radial portion 32 of the block ring 30 can be located at the end of the second axial portion 31 away from the skeleton 10, so that in the case of relatively limited axial space, the first chamber 41 can still have enough space to temporarily store a large amount of particulate matter and oil. Not only realizes the miniaturization and compact design of the bearing sealing assembly 100, but also significantly improves the space utilization, and is also conducive to simplifying the installation process.

[0040] In some embodiments, the second radial portion 32 of the baffle ring 30 can be arranged with a plurality of flow guide holes 33 at equal intervals along the circumferential direction W. When the bearing rotates, the plurality of flow guide holes 33 can more fully disperse and discharge the particulate impurities and oil in the first chamber 41. The plurality of flow guide holes 33 arranged at equal intervals along the circumferential direction W not only can achieve more balanced and efficient drainage, ensuring the stability and effectiveness of the bearing sealing assembly 100 during operation, but also can help evenly eliminate the pressure difference between the first chamber 41 and the second chamber 42 along the circumferential direction W, ensuring that the centrifugal lip 22 is more evenly stressed along the circumferential direction, thereby effectively avoiding the problem of the centrifugal lip 22 turning over due to excessive local pressure, and ensuring the sealing and reliability of the bearing sealing assembly 100 during long-term operation.

[0041] In a conventional cartridge-type sealing assembly 100, as shown in Figure 2 , the centrifugal lip 22 is separate from the main sealing lip 21, and the centrifugal lip 22 is usually located radially outward of the main sealing lip 21, and there is a groove between the centrifugal lip 22 and the main sealing lip 21. In the present embodiment, the centrifugal lip 22 is integrally formed with the main sealing lip 21, and the main sealing lip 21 extends radially outward at the end away from the skeleton 10 to form the centrifugal lip 22.

[0042] With this structural design, on the one hand, the structure is simplified, and the production cost and difficulty are reduced; on the other hand, the centrifugal lip 22 integrally formed with the main sealing lip 21 eliminates the groove that can exist between the two, avoiding the problem of oil and particulate impurities accumulating in the groove. In addition, the oil or particulate impurities at the main sealing lip 21 can be seamlessly guided to the contact position of the centrifugal lip 22 and the baffle ring 30, facilitating timely discharge by centrifugal force.

[0043] In some embodiments, as shown in Figure 3 , the sealing body 20 covers the entire axial other side of the first radial portion 12 of the skeleton 10, and forms a sealing head at the transition area between the first radial portion 12 and the first axial portion 11 of the skeleton 10. The sealing body 20 completely covers the axial other side of the skeleton 10, which can make the entire sealing body 20 more stably fixed on the skeleton 10 when the bearing sealing assembly 100 rotates at high speed, avoiding the breakage of the main sealing lip 21 and the centrifugal lip 22 under the action of centrifugal force.

[0044] In some embodiments, a chamfer portion 13 is provided at the transition area between the first radial portion 12 and the first axial portion 11 of the skeleton 10, and the sealing head is attached to the chamfer portion 13, which provides a position for the sealing head 23 to attach. As shown in Figure 3 , the presence of the chamfer portion 13 significantly increases the attachment area of the sealing head 23 attached to the skeleton 10, so that the sealing head 23 can be more firmly attached to the skeleton 10, enhancing the stability and connection strength of the sealing assembly 100 at the radially outer side.

[0045] In some embodiments, the bearing sealing assembly 100 further comprises a spring 40, which is sleeved on the radial outer side of the main sealing lip 21, and tightly compacts the main sealing lip 21 and the inner ring 200 of the bearing by a radial force, so as to achieve an effective sealing effect. The spring 40 can be formed of metal / alloy, etc. In one example, the radial outer side of the main sealing lip 21 can also be provided with a groove, and the spring 40 is clamped in the groove on the radial outer side of the main sealing lip 21, so as to prevent the spring 40 from slipping off.

[0046] Based on the same inventive concept, the present disclosure provides a rolling bearing, comprising: an inner ring 200, an outer ring 300, and a bearing sealing assembly 100, the skeleton 10 of the bearing sealing assembly 100 is torsionally connected with the outer ring 300, and the sealing body 20 and the stop ring 30 rotate with the skeleton 10 and the outer ring 300. The specific manner of realizing the functions in the rolling bearing in the above-mentioned embodiments has been described in detail in the embodiments related to the bearing sealing assembly 100, and will not be described in detail here.

[0047] It can be understood that "multiple" in the present disclosure refers to two or more, and other quantifiers are similar. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship. The singular form "a", "said" and "the" are also intended to include the plural form, unless the context clearly indicates otherwise.

[0048] It can be 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 represent a specific order or 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 structure can also be referred to as the second structure, and similarly, the second structure can also be referred to as the first structure.

[0049] Other embodiments of the present disclosure will be apparent to those skilled in the art upon consideration of the specification and practice of the concepts disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including modifications and equivalents that are obvious to those skilled in the art. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0050] It should be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A bearing seal assembly (100), characterized by, The bearing seal assembly (100) comprises: a skeleton (10) comprising a first axial portion (11) and a first radial portion (12); a seal body (20) attached to the skeleton (10), the seal body (20) being provided with a main sealing lip (21) and a centrifugal lip (22), the main sealing lip (21) and the centrifugal lip (22) being located on the axial side of the first radial portion (12) of the skeleton (10); a stop ring (30) located on the axial side of the first radial portion (12) of the skeleton (10), wherein the stop ring (30) comprises a second axial portion (31) and a second radial portion (32), the second axial portion (31) of the stop ring (30) is interference-fitted with the first axial portion (11) of the skeleton (10), and the second radial portion (32) of the stop ring (30) is interference- abutted with the centrifugal lip (22) in a static state.

2. The bearing seal assembly (100) according to claim 1, wherein a plurality of flow guide holes (33) are arranged on the second radial portion (32) of the stop ring (30), the flow guide holes (33) are located radially outward of the abutting position of the centrifugal lip (22) and the second radial portion (32), and in a rotating state, the flow guide holes (33) enable the centrifugal lip (22) to be separated from the second radial portion (32) of the stop ring (30).

3. The bearing seal assembly (100) according to claim 2, wherein a plurality of flow guide holes (33) are arranged on the second radial portion (32) of the stop ring (30) at equal intervals in the circumferential direction.

4. The bearing seal assembly (100) according to claim 1, wherein the centrifugal lip (22) is integrally formed with the main sealing lip (21), and the main sealing lip (21) extends radially outward at the end away from the skeleton (10) to form the centrifugal lip (22).

5. The bearing seal assembly (100) according to claim 1, wherein the radial end of the main sealing lip (21) is located radially inward of the end of the second radial portion (32) of the stop ring (30).

6. The bearing seal assembly (100) according to claim 1, wherein the second radial portion (32) of the stop ring (30) is located at the end of the second axial portion (31) away from the skeleton (10).

7. The bearing seal assembly (100) according to claim 1, wherein the seal body (20) covers the entire axial other side of the first radial portion (12) of the skeleton (10), and forms a sealing head (23) at the transition area between the first radial portion (12) and the first axial portion (11) of the skeleton (10).

8. The bearing seal assembly (100) according to claim 7, wherein a chamfer portion (13) is arranged at the transition area between the first radial portion (12) and the first axial portion (11) of the skeleton (10), and the sealing head (23) is attached to the chamfer portion (13).

9. The bearing seal assembly (100) according to claim 1, wherein The bearing seal assembly (100) further comprises a spring (40) sleeved on the radial outer side of the main seal lip (21) to press the main seal lip (21) radially.

10. A rolling bearing, characterized in that, Comprise: an inner ring (200); an outer ring (300); and The bearing seal assembly (100) as claimed in any one of claims 1 to 9, wherein the backbone (10) is torsionally connected with the outer ring (300), and the seal body (20) and the stop ring (30) rotate with the backbone (10) and the outer ring (300).

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