CN116357680A

CN116357680A - Box-type sealing assembly and bearing

Info

Publication number: CN116357680A
Application number: CN202111614055.8A
Authority: CN
Inventors: 刘鑫; 宋宏伟; 吴丽娟
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2023-06-30

Abstract

The application provides a box seal assembly and a bearing. In the cartridge seal assembly, at least two dust-proof rings are provided, which are arranged offset in the axial direction, and are fixed to the slinger and are in contact with the skeleton so as to close an opening portion of a passage between the slinger and the skeleton toward the outside. In this way, by providing at least two dust rings in the manner as described above, it is possible to effectively prevent solid particles such as fine sand from invading the inside of the cartridge seal assembly, thereby avoiding abrasion of the main lip and other negative effects due to these solid particles.

Description

Box-type sealing assembly and bearing

Technical Field

The present application relates to a seal structure for use between two members capable of relative rotation, and in particular to a cartridge seal assembly and a bearing including the cartridge seal assembly.

Background

A cartridge seal assembly that may be used in a bearing of a high speed rail vehicle is shown in fig. 1. As shown in fig. 1, the cartridge seal assembly includes a slinger 10, a backbone 20, and a seal 30. The slinger 10 and the armature 20 are made of metal, the seal 30 is made of rubber, and the seal 30 is vulcanization molded to the armature 20. The seal portion 30 includes a contact-type main lip 301 extending from the backbone 20, and a radially inner end of the main lip 301 is in contact with the slinger 10 to achieve sealing. In addition, other portions of the sealing portion 30 are also formed with a labyrinth structure, a sub lip, and the like, thereby assisting the main lip 301 in sealing.

However, in desert environments there are large amounts of solid particles such as wind-fed fine sand which may invade the box seal assembly along the path shown by the single-dot chain line in fig. 1, causing serious wear of the main lip 301, after which these solid particles will enter the interior of the bearing, with the risk of failure of the bearing.

Disclosure of Invention

The present application has been made in view of the above-described problems of the prior art. An object of the present application is to provide a cartridge sealing assembly capable of effectively preventing solid particles such as fine sand from invading the inside of the cartridge sealing assembly. It is a further object of the present application to provide a bearing comprising the cartridge seal assembly which may be used in particular, but not exclusively, in high speed rail vehicles.

In order to achieve the above object, the present application adopts the following technical solutions.

The present application provides a cartridge seal assembly having an annular shape as a whole for sealing between a first member and a second member rotatable relative to each other, the cartridge seal assembly including a slinger, a frame, a seal portion, a first dust ring and a second dust ring,

the flinger is for fixing with the first component, the backbone is for fixing with the second component, the flinger and the backbone are spaced apart from each other to form a passage between the flinger and the backbone communicating both axial sides of the cartridge seal assembly, the seal is attached to the backbone, the seal has a seal lip protruding from the backbone;

the first dust-proof ring and the second dust-proof ring are arranged in a staggered manner in the axial direction of the cartridge seal assembly, and both the first dust-proof ring and the second dust-proof ring are attached to the slinger and contact with the skeleton to close an opening portion of one side in the axial direction of the passage.

In an alternative, the slinger includes first and second radial portions arranged offset in the axial direction, each of the first and second radial portions extending radially of the cartridge seal assembly, the first dust ring being secured to the first radial portion and the second dust ring being secured to the second radial portion.

In another alternative, the first radial portion is located on one axial side of the second radial portion and is located radially inward of the second radial portion, the first dust ring is located on one axial side of the first radial portion, and the second dust ring is located on the other axial side of the second radial portion.

In another alternative, the skeleton includes a skeleton inclined portion that extends obliquely toward a radial inside while extending from one axial side toward the other axial side, and the first dust-proof ring and the second dust-proof ring are both in contact with the skeleton inclined portion.

In another alternative, the flinger includes a flinger inclined portion extending in the same direction as the inclination of the backbone inclined portion, the opening being located between the flinger inclined portion and the backbone inclined portion.

In another alternative, the slinger inclined portion is located between the first dust ring and the second dust ring in the axial direction.

In another alternative, the seal lip includes a main lip including an elastic portion and a wear portion, the elastic portion being arranged in a layered arrangement with the wear portion, the wear portion being in contact with the slinger.

In another alternative, the skeleton includes a skeleton radial portion, the seal is attached to a radially inner end of the skeleton radial portion, the main lip extends toward the radially inner side while extending toward one axial side, and the seal is further formed with a pumping groove on the other axial side of the main lip.

In another alternative, the seal includes rubber, and the first dust ring and the second dust ring are made of felt.

The application provides a bearing, which comprises the box type sealing assembly according to any one of the technical schemes.

Through adopting above-mentioned technical scheme, this application provides a novel box-type seal assembly and bearing, wherein sets up two at least on box-type seal assembly's axial staggered arrangement's dust ring, and the dust ring is fixed in the flinger and contacts with the skeleton to seal the passageway between flinger and the skeleton towards the opening in outside. In this way, by providing at least two dust rings in the manner as described above, it is possible to effectively prevent solid particles such as fine sand from invading the inside of the cartridge seal assembly, thereby avoiding abrasion of the main lip and other negative effects due to these solid particles.

Drawings

Fig. 1 is a schematic sectional view showing a partial structure of a cartridge seal assembly taken along an axial direction and a radial direction of the cartridge seal assembly.

FIG. 2 is a schematic cross-sectional view taken along the axial and radial directions of the cartridge seal assembly showing a partial structure of the cartridge seal assembly according to an embodiment of the present application.

Description of the reference numerals

10 flinger 20 skeleton 30 seal 301 main lip

1 flinger 11 first axial portion 12 first radial portion 13 second axial portion 14 second radial portion 15 flinger inclined portion

2 skeleton 21 skeleton inclined portion 22 skeleton radial portion

3 wear-resistant part 3c pump oil groove of main lip 311 elastic part 312 of sealing part 31

4 first dust-proof ring 5 second dust-proof ring

Aaxial R radial.

Detailed Description

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are merely illustrative of how one skilled in the art may practice the present application and are not intended to be exhaustive of all of the possible ways of practicing the present application nor to limit the scope of the present application.

In the present application, unless otherwise indicated, axial, radial, and circumferential refer to the axial, radial, and circumferential directions, respectively, of the cartridge seal assembly of the present application; "axial side" refers to the right side in fig. 2, and may be the outside of the bearing, i.e., the side on which the solid particles are located, in the case where the cartridge seal assembly is mounted to the bearing; "axial other side" refers to the left side in fig. 2, which may be the inner side of the bearing, i.e. the side on which the oil is located, in the case of a cartridge seal assembly mounted to the bearing.

In this application, the two portions being arranged offset in the axial direction means that the two portions do not overlap each other as viewed in a radial direction perpendicular to the axial direction.

The structure of a cartridge sealing assembly according to an embodiment of the present application is described below with reference to the accompanying drawings.

A cartridge seal assembly according to an embodiment of the present application may be used to radially seal a bearing and may have an annular shape overall. As shown in fig. 2, the cartridge seal assembly includes a slinger 1, a skeleton 2, a seal portion 3, a first dust ring 4, and a second dust ring 5. In the cartridge seal assembly, a passage that communicates both sides in the axial direction of the cartridge seal assembly is formed between the slinger 1 and the bobbin 2.

In the present embodiment, the slinger 1 is made of a hard material such as metal, and has an annular shape extending continuously in the circumferential direction as a whole. As shown in fig. 2, the slinger 1 may include a first axial portion 11, a first radial portion 12, a second axial portion 13, a second radial portion 14, and a slinger inclined portion 15 which are integrally formed by a plurality of bends.

The first axial portion 11 extends for a certain length along the axial direction a, and the first axial portion 11 may be fixed with a first component, such as a bearing inner ring. The first radial portion 12 extends from one axial side end of the first axial portion 11 toward the radial outside along the radial direction R. The second axial portion 13 extends from the radially outer end of the first radial portion 12 toward the other axial side along the axial direction a. The second radial portion 14 extends radially outward from the axially other side end of the second axial portion 13 along the radial direction R. Thus, the first radial portion 12 is located on one axial side of the second radial portion 14 and on the radially inner side of the second radial portion 14, and the first radial portion 12 and the second radial portion 14 are arranged offset in the axial direction a. The slinger inclined portion 15 extends obliquely toward the radial outside while extending from the radial outside end of the second radial portion 14 toward the axial side, and the slinger inclined portion 15 is arranged overlapping the second axial portion 13 in the axial direction a, which is advantageous in reducing the axial dimension occupied by the entire slinger 1.

In the present embodiment, the skeleton 2 is made of a hard material such as metal, and has an annular shape extending continuously in the circumferential direction as a whole. As shown in fig. 2, the bobbin 2 may include a bobbin inclination portion 21, a bobbin radial portion 22, and other portions formed as one body by a plurality of bends.

The skeleton inclined portion 21 extends toward one side in the axial direction while extending obliquely toward the radial outside. The skeleton inclined portion 21 is the same as the inclined extending direction of the slinger inclined portion 15 (i.e., both extend obliquely toward the upper right side or the lower left side in fig. 2). In the present embodiment, both the skeleton inclined portion 21 and the slinger inclined portion 15 may be substantially parallel and spaced apart from each other (but in a modification, both may extend in the same direction but not parallel), and the skeleton inclined portion 21 and the slinger inclined portion 15 face each other. The carcass radial portion 22 extends from a radially inner end of the carcass inclined portion 21 toward a radially inner side along the radial direction R. In the axial direction a, the carcass radial portion 22 mainly faces the second radial portion 14 each other; in the radial direction R, the carcass radial portion 22 and the first axial portion 11 face each other. In this way, a passage that communicates one side in the axial direction of the cartridge seal assembly with the other side in the axial direction is formed between the backbone 2 and the slinger 1, and an opening portion of the passage on one side in the axial direction is located between the backbone inclined portion 21 and the slinger inclined portion 15. In addition, the other portion of the skeleton 2 is a structure for fixing with a second member such as a bearing outer race, and the other portion is formed into a predetermined shape by bending a plurality of times from the radially outer side end of the skeleton inclined portion 21.

In the present embodiment, the seal portion 3 may be made of an elastic material such as rubber, and has an annular shape extending continuously in the circumferential direction as a whole. As shown in fig. 2, the seal portion 3 may be attached to the radially inner end portion of the skeleton radial portion 22 by, for example, vulcanization molding or the like. The seal portion 3 includes a main lip 31, and the main lip 31 extends toward one side in the axial direction and extends toward the inside in the radial direction. The main lip 31 includes an elastic portion 311 and a wear-resistant portion 312 fixed by bonding or vulcanization or the like, the elastic portion 311 and the wear-resistant portion 312 being arranged in a laminated manner, the wear-resistant portion 312 being in contact with the first axial portion 11 of the slinger 1 at all times. The elastic portion 311 is made of rubber, and the abrasion resistant portion 312 is made of Polytetrafluoroethylene (PTFE). In this way, since polytetrafluoroethylene has good wear resistance and high temperature resistance as compared with rubber, the main lip 31 including the wear-resistant portion 312 can be applied to a bearing having a higher rotational speed. The seal portion 3 is also formed with a plurality of oil pump grooves 3c opposed to the first axial portion 11, the plurality of oil pump grooves 3c being disposed at intervals in the circumferential direction, all the oil pump grooves 3c being located on the other axial side of the main lip 31. The radially outer side surface of the pump oil groove 3c extends toward the other side in the axial direction while extending toward the radially outer side. In this way, even if oil enters the cartridge seal assembly, a part of the oil can be pumped back to the other axial side through the oil pump groove 3c during rotation of the backbone 2 and the seal portion 3 relative to the slinger 1.

In the present embodiment, the first dust-proof ring 4 and the second dust-proof ring 5 may be made of felt, which has better wear resistance and ultraviolet aging resistance than rubber, and thus is more suitable for a material of the dust-proof ring constituting the opening portion of the outside of the closed path. The first dust ring 4 is located on one axial side of the first radial portion 12, and the first dust ring 4 is fixed to the first radial portion 12, for example, by bonding. The second dust ring 5 is located on the other axial side of the second radial portion 14, and the second dust ring 5 is fixed to the second radial portion 14, for example, by bonding. Thus, the first dust-proof ring 4 and the second dust-proof ring 5 are arranged offset in the axial direction a, and constitute two protection structures for preventing solid particles from entering the opening of the passage. The radially outer end of the first dust-proof ring 4 and the radially outer end of the second dust-proof ring 5 are both in contact with the skeleton inclined portion 21. Further, in the axial direction a, the inclined portion of the slinger 1 is located between the first dust ring 4 and the second dust ring 5.

It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art can make various modifications and changes to the above-described embodiments without departing from the scope of the present application. The following is a supplementary explanation of the technical scheme of the present application.

i. In the technical scheme of the application, the number of the dustproof rings can be more than two according to the requirement. Accordingly, the slinger may be formed with a plurality of radial portions which are offset in the axial direction, and each dust ring is fixed to the corresponding radial portion and is in contact with the skeleton, whereby the effect of preventing solid particles from entering the inner passage of the cartridge seal assembly can be further improved.

it will be appreciated that the cartridge seal assembly of the present application may include other seal lips, such as secondary lips, in addition to the primary lip 31, as desired, and that the other seal lips may be either contact or non-contact seal lips.

it is understood that the portions where the respective dust rings 4, 5 and the skeleton inclined portion 21 overlap each other in fig. 2 represent the amount of interference between the dust rings 4, 5 and the skeleton inclined portion 21. The dust-proof effect can be further improved while ensuring a certain interference amount.

it will be appreciated that the cartridge seal assembly of the present application not only improves the sealing effect against ingress of solid particles, but also has a longer useful life. In addition, the box type sealing component is simple in structure, easy to manufacture and low in cost.

The present application also provides a bearing comprising the above cartridge seal assembly, which bearing may be a bearing for a high speed rail vehicle. The cartridge sealing assembly according to the present application may be used not only for radial sealing of bearings of high-speed railway vehicles but also in various devices in other fields as needed.

Claims

1. A cartridge seal assembly characterized in that the cartridge seal assembly has an annular shape as a whole for sealing between a first member and a second member which are rotatable relatively, the cartridge seal assembly comprising a slinger (1), a frame (2), a seal portion (3), a first dust ring (4) and a second dust ring (5),

the flinger (1) is for fixing with the first component, the backbone (2) is for fixing with the second component, the flinger (1) and the backbone (2) are spaced apart from each other to form a passage between the flinger (1) and the backbone (2) communicating both axial sides of the cartridge seal assembly, the seal (3) is attached to the backbone (2), the seal (3) has a seal lip protruding from the backbone (2);

the first dust-proof ring (4) and the second dust-proof ring (5) are arranged in a staggered manner in the axial direction (A) of the box-type sealing assembly, and the first dust-proof ring (4) and the second dust-proof ring (5) are both attached to the slinger (1) and are in contact with the framework (2) so as to close an opening part of one axial side of the passage.

2. The cartridge seal assembly according to claim 1, wherein the slinger (1) comprises a first radial portion (12) and a second radial portion (14) arranged offset in the axial direction (a), the first radial portion (12) and the second radial portion (14) each extending along a radial direction (R) of the cartridge seal assembly, the first dust ring (4) being fixed to the first radial portion (12), the second dust ring (5) being fixed to the second radial portion (14).

3. The cartridge seal assembly of claim 2, wherein the first radial portion (12) is located on one axial side of the second radial portion (14) and radially inward of the second radial portion (14), the first dust ring (4) is located on one axial side of the first radial portion (12), and the second dust ring (5) is located on the other axial side of the second radial portion (14).

4. A cartridge sealing assembly according to any one of claims 1 to 3, wherein the skeleton (2) includes a skeleton inclined portion (21), the skeleton inclined portion (21) extending obliquely toward a radial inside while extending from one axial side toward the other axial side, and the first dust-proof ring (4) and the second dust-proof ring (5) are each in contact with the skeleton inclined portion (21).

5. The cartridge seal assembly according to claim 4, wherein the slinger (1) includes a slinger inclined portion (15), the slinger inclined portion (15) and the skeleton inclined portion (21) are in the same inclined extending direction, and the opening portion is located between the slinger inclined portion (15) and the skeleton inclined portion (21).

6. The cartridge seal assembly according to claim 5, wherein the slinger inclined portion (15) is located between the first dust ring (4) and the second dust ring (5) in the axial direction (a).

7. A cartridge seal assembly according to any one of claims 1 to 3, wherein the seal lip includes a main lip (31), the main lip (31) includes an elastic portion (311) and a wear-resistant portion (312), the elastic portion (311) is arranged in a stacked manner with the wear-resistant portion (312), and the wear-resistant portion (312) is in contact with the slinger (1).

8. The cartridge seal assembly according to claim 7, wherein the skeleton (2) includes a skeleton radial portion (22), the seal portion (3) is attached to a radially inner side end portion of the skeleton radial portion (22), the main lip (31) extends toward the axially one side while extending toward the radially inner side, the seal portion (3) is further formed with a pump oil groove (3 c), and the pump oil groove (3 c) is located on the axially other side of the main lip (31).

9. A cartridge sealing assembly according to any one of claims 1 to 3, wherein the sealing portion (3) comprises rubber, and the first dust-proof ring (4) and the second dust-proof ring (5) are made of felt.

10. A bearing comprising the cartridge seal assembly of any one of claims 1 to 9.