阅读说明：本技术 密封组件 (Seal assembly ) 是由 刘鑫 张岳林 于 2020-07-17 设计创作，主要内容包括：本发明涉及一种用于静态密封的密封组件。该密封组件包括密封圈和多个环形件,多个环形件沿轴向对齐,多个环形件中的两个相邻环形件的轴向端部沿轴向相互邻接。其中,密封圈包括骨架和弹性密封体,骨架固定在两个相邻环形件中的第一环形件上,弹性密封体固定在骨架上并且具有向着两个相邻环形件中的第二环形件延伸的密封唇。本发明的密封组件具有可靠的密封效果。(The present invention relates to a seal assembly for static sealing. The seal assembly includes a seal ring and a plurality of ring members axially aligned, with axial ends of two adjacent ring members of the plurality axially abutting one another. Wherein, the sealing washer includes skeleton and elasticity sealing body, and the skeleton is fixed on the first annular member in two adjacent annular members, and the elasticity sealing body is fixed on the skeleton and has the seal lip that extends towards the second annular member in two adjacent annular members. The sealing assembly of the invention has reliable sealing effect.)

1. A seal assembly for a static seal comprising a seal ring (50) and a plurality of ring members axially aligned, axial ends of two adjacent ring members of the plurality of ring members axially abutting each other,

it is characterized in that the preparation method is characterized in that,

the seal ring (50) comprises a skeleton (51) and an elastic sealing body (52), wherein the skeleton (51) is fixed on a first annular member of the two adjacent annular members, and the elastic sealing body (52) is fixed on the skeleton (51) and is provided with a sealing lip (56) extending towards a second annular member of the two adjacent annular members.

2. The seal assembly of claim 1, wherein the sealing lip (56) abuts the second ring member.

3. The seal assembly according to claim 2, wherein the first and second ring pieces each have a corresponding step (21, 31) on one radial side of an axial end, such that an annular mounting groove (60) is formed between the two steps (21, 31) of the first and second ring pieces, the sealing ring (50) being mounted in the mounting groove (60).

4. A sealing assembly according to claim 3, characterized in that the skeleton (51) has a first section (53), a second section (54) and a connecting section (55), the first section (53) radially abutting the first ring in the mounting groove (60), the second section (54) being connected to the first section (53) by the connecting section (55) and radially spaced apart, the sealing lip (56) extending from the end of the second section (54) facing the second ring.

5. A seal assembly according to claim 4, characterized in that the second section (54) extends axially beyond the first ring, the direction of extension of the sealing lip (56) being inclined with respect to a radial direction so that a free end of the sealing lip (56) is offset with respect to the other end towards a direction close to the first ring.

6. The seal assembly of claim 4, wherein the connecting section (55) axially abuts the step (21) of the first ring.

7. The seal assembly of claim 6, wherein the second section (54) extends radially outward of the mounting groove (60), the sealing lip (56) abutting the second ring member outward of the mounting groove (60).

8. The seal assembly of claim 4, wherein the elastomeric seal body (52) envelopes a surface of the first section (53) abutting the first ring, the first section (53) abutting the first ring through the elastomeric seal body (52).

9. A seal assembly according to claim 2, characterized in that the sealing lip (56) has a toothed surface structure on the surface abutting the second ring part, seen in a cross-section through the centre axis.

10. A seal assembly according to any one of claims 1 to 9, wherein the plurality of rings are inner or outer rings of a bearing arrangement comprising a roller (40) mounted on one radial side of the plurality of rings, the seal ring (50) being mounted on one radial side of the adjacent two rings for facing the roller (40).

Technical Field

The invention relates to the technical field of sealing. In particular, the present invention relates to a seal assembly for static sealing.

Background

A bearing is a common supporting member in various industrial fields, and since it is necessary to use lubricating oil to reduce friction, various seals are often required to be installed to prevent leakage of the lubricating oil. The seal is of the type used for dynamic sealing between an inner ring and an outer ring, as well as for static sealing between side-by-side bearing rings. For example, in Tapered Roller Bearings (TRBs), it is often necessary to install seals for static sealing. Tapered roller bearings are used to carry combined loads from both radial and axial directions, often assembled in pairs to perform their function, or manufactured directly in double, four or more rows. In multi-row tapered roller bearings there are typically a plurality of bearing inner or outer races that are axially aligned and abutted together. A seal ring needs to be installed between two inner rings or outer rings abutting each other to prevent foreign substances from entering a space inside the bearing ring or prevent lubricating oil inside from leaking to the outside.

For example, CN 202732689U discloses a typical sealed type tapered roller bearing. The tapered roller bearing is provided with double rows of inner rings, wherein corresponding step parts are formed on the end parts of the two inner rings and are mutually butted, so that an annular concave part is formed between the two step parts, an elastic sealing element is installed in the concave part, and the sealing element is fixed in the concave part in an interference fit mode.

In the above-described conventional sealing manner, the cross section of the seal member is simply rectangular, and the seal is achieved only by relatively pressing the two inner rings from both axial sides. However, in a tapered roller bearing used for a truck wheel, for example, when a load applied to the bearing increases, a gap may be generated between the two bearing rings, and the gap may increase as the load increases, so that a pressing force applied to the seal decreases, and thus, a separation and a seal failure occur.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to provide a sealing assembly with more reliable sealing effect.

The above-mentioned technical problem is solved by a seal assembly for static sealing according to the present invention. The seal assembly includes a seal ring and a plurality of ring members axially aligned, with axial ends of two adjacent ring members of the plurality axially abutting one another. Wherein, the sealing washer includes skeleton and elasticity sealing body, and the skeleton is fixed on the first annular member in two adjacent annular members, and the elasticity sealing body is fixed on the skeleton and has the seal lip that extends towards the second annular member in two adjacent annular members. The plurality of annular elements may be, for example, a plurality of axially aligned inner rings or a plurality of axially aligned outer rings of the bearing arrangement. For static sealing between two bearing rings which are statically and axially adjacent, the sealing ring is fixed on the bearing ring on one side through a rigid framework, and forms sealing fit with the bearing ring on the other side through a sealing lip which elastically extends from the framework, so that when the two adjacent bearing rings are subjected to position deviation (rotation or axial movement), the framework moves along with the bearing ring on one side, and meanwhile, the sealing lip can keep sealing fit with the bearing ring on the other side through the extending shape and elastic deformation, thereby eliminating the influence of position change and improving the reliability of the sealing effect of the sealing assembly. Preferably, for a bearing arrangement comprising a roller mounted on one radial side of a plurality of annuli, the seal ring is typically mounted on one radial side of two adjacent annuli intended to face the roller.

According to a preferred embodiment of the invention, the sealing lip may abut the second annular member, thereby forming a contact seal with the second annular member. Thus, when two adjacent ring members experience unexpected outboard deflection during operation, the resilient sealing lip can be held in abutment against the second ring member by elastic deformation, thereby ensuring reliability of the sealing effect.

According to another preferred embodiment of the present invention, the first ring member and the second ring member may have corresponding steps on one side in the radial direction of the axial end portions, respectively, such that an annular mounting groove is formed between the two steps of the first ring member and the second ring member. The sealing ring can be mounted in the mounting groove, so that positioning, in particular axial positioning, of the sealing ring can be achieved by means of the mounting groove.

According to a further preferred embodiment of the invention, the carcass may have a first section radially abutting the first ring in the mounting groove, a second section connected to the first section by the connecting section and radially spaced apart, and a connecting section, the sealing lip extending from an end of the second section near the second ring. The first and second sections may be generally axially extending sections and the connecting section may be a generally radially extending section. The rigid framework is fixedly connected with the first annular part through the first section, and is particularly fixed on the first annular part in an interference fit mode. A second section spaced radially from the first section provides an extended space for the sealing lip so that the sealing lip can resiliently abut the second ring member through the free end.

According to a further preferred embodiment of the invention, the second section may extend in the axial direction beyond the first ring-shaped element, the direction of extension of the sealing lip being inclined with respect to the radial direction such that the free end of the sealing lip is offset with respect to the other end (i.e. the part connected to the skeleton) towards the direction of approach to the first ring-shaped element. The inclined extension mode is beneficial to improving the sealing effect of the sealing lip on one hand and is convenient for assembling the sealing assembly on the other hand.

According to a further preferred embodiment of the invention, the connecting section may axially abut a step of the first annular element, so that axial positioning of the sealing ring is achieved by the step when the sealing ring is mounted.

According to a further preferred embodiment of the invention, the second section may extend radially outside the mounting groove, the sealing lip abutting the second ring member outside the mounting groove. In the case where the mounting groove is small in size, a portion other than the mounting groove may be used to provide an extended space for the seal lip.

According to another preferred embodiment of the invention, the elastic sealing body covers the surface of the first section abutting the first ring member, whereby the first section indirectly abuts the first ring member via the elastic sealing body, thereby enhancing the sealing effect between the skeleton and the first ring member.

According to another preferred embodiment of the invention, the sealing lip has a toothed surface structure on the surface abutting the second ring piece, seen in a cross-section through the centre axis. Similarly, the elastic sealing body can also have a toothed surface structure on the part which encloses the first section, which surface structure faces the bottom of the mounting groove. This configuration may enhance the sealing effect between the contact surfaces.

Drawings

The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:

FIG. 1 shows a cross-sectional view of a seal assembly according to an embodiment of the invention; and

FIG. 2 illustrates a cross-sectional view of a seal ring of a seal assembly according to an embodiment of the present invention.

Detailed Description

Hereinafter, a specific embodiment of a seal assembly according to the present invention will be described with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the appended claims.

According to an embodiment of the present invention, a seal assembly having an improved sealing effect is provided. For example, the seal assembly may be or be an integral part of various sealed bearings. In the present invention, the seal assembly is shown schematically as part of a multi-row tapered roller bearing, but it should be understood that the seal assembly could be other types of assemblies that require static sealing.

Fig. 1 and 2 illustrate one embodiment of the seal assembly. Fig. 1 shows a partial axial cross-sectional view of a multi-row tapered roller bearing incorporating the seal assembly. As shown in fig. 1, the multi-row tapered roller bearing includes an outer ring 10, a first inner ring 20, a second inner ring 30, and a plurality of rollers 40. Wherein the outer ring 10, the first inner ring 20, and the second inner ring 30 are respectively of an annular structure having the same rotational axis, and the rollers 40 are of a cone structure. In the present embodiment, the multi-row tapered roller bearing is schematically illustrated as having two rows of rollers 40, each row of rollers 40 corresponding to a separate inner ring 20 or 30, respectively, but sharing the same outer ring 10, and a plurality of rollers 40 in the same row are installed between the outer ring 10 and the first inner ring 20 or the second inner ring 30 in a circumferentially uniform distribution. The first inner ring 20 and the second inner ring 30 are axially aligned and axially abut each other at their axial ends. The first inner ring 20 and the second inner ring 30 constitute two adjacent annular elements of the sealing assembly, respectively.

Fig. 2 shows a partially enlarged view of the multi-row tapered roller bearing of fig. 1. As shown in fig. 2, stepped portions, i.e., a first stepped portion 21 on the first inner race 20 and a second stepped portion 31 on the second inner race 30, are formed on radially outer sides of axial end portions where the two inner races abut each other, respectively. The two steps are annular steps each of the same size radially inwardly tapered at the respective axial end so that when the two axial ends abut each other, the axial surfaces of the two are substantially flush (but a transitional chamfer is allowed at the respective edges and the axial lengths of the two steps may be the same or different), forming an annular groove, referred to herein as the mounting groove 60, between the two steps.

The seal assembly also includes a seal ring 50 mounted in the mounting groove 60. The seal ring 50 includes a skeleton 51 and an elastic seal body 52. The bobbin 51 and the elastic sealing body 52 are both coaxially arranged annular structures. In which the bobbin 51 is made of a rigid material such as metal, and the elastic sealing body 52 is made of an elastic material such as rubber.

The skeleton 51 comprises, seen in a cross-section through the central axis of the sealing assembly, a first section 53, a second section 54 and a connecting section 55. Wherein the first section 53 and the second section 54 extend substantially axially and the connection section 55 extends substantially radially. The first segment 53 radially abuts against an axial surface of the first stepped portion 21 of the first inner ring 20, thereby fixing the skeleton 51 to the first inner ring 20 by, for example, interference fit. The connecting section 55 connects the ends of the first and second sections 53, 54 facing the first inner ring 20 to one another, so that the first and second sections 53, 54 are spaced apart in the radial direction. In the present embodiment, the connecting section 55 extends radially outside the mounting groove 60, such that the second section 54 extends outside the mounting groove 60. In this case, the connecting section 55 may preferably axially abut against the radial surface of the first step portion 21, thereby facilitating axial positioning of the seal ring 50 during press fitting. The radial surfaces of each of the first step portion 21 and the second step portion 31 may not extend straight, but form arcs corresponding to each other, as viewed in a section passing through the central axis of the seal assembly, so that the mouth axial length of the mounting groove 60 is smaller than the bottom axial length. In this case, the connecting section 55 may abut only a portion radially outside the radial surface of the first boss portion 21. The second section 54 has a greater axial extent than the first section 53, so that the first section 53 does not extend beyond the first inner ring 20 to the second step 31, while the second section 54 extends beyond the first inner ring 20 and also beyond the entire mounting groove 60 to the radially outer side of the second inner ring 30.

The elastic sealing body 52 is fixedly connected to the carcass 51 and has an annular, sheet-like sealing lip 56 which extends from the end of the second section 54 facing the second inner ring 30. The free end of the sealing lip 56 preferably abuts on the side surface of the second inner ring 30 outside the mounting groove 60. In the assembled state, the extending direction of the seal lip 56 is inclined with respect to the radial direction so that the free end of the seal lip 56 is offset toward the direction approaching the first inner race 20 with respect to the other end thereof connected to the second section 54. In this configuration, the seal ring 50 is usually first press-fitted on the first stepped portion 21 of the first inner ring 20, and then the second inner ring 30 is abutted against the first inner ring 20, and during the process that the axial end portion of the second inner ring 30 approaches the first inner ring 20, the side surface of the second inner ring 30 can automatically guide the seal lip 56 to form such an inclined manner that is advantageous for improving the sealing effect. Preferably, a toothed surface structure may be provided on the surface of the seal lip 56 abutting the second inner race 30, so as to enhance the sealing effect of the seal lip 56. This toothed surface structure is in fact a set of recessed areas in the form of concentric circles formed on the surface of the annular sealing lip 56, but appears toothed in a section through the central axis of the sealing assembly.

The portion of the elastic sealing body 52 fixedly connected to the bobbin 51 may cover a part or the entire surface of the bobbin 51. Preferably, the elastic sealing body 52 may cover the surface of the first section 53 abutting the first inner race 20. Therefore, the first section 53 indirectly abuts the first inner race 20 through the elastic sealing body 52, thereby improving the sealing effect between the first section 53 and the first inner race 20. Similarly, the elastic sealing body 52 may also cover the surface of the connection section 55 abutting the first inner race 20, so that the connection section 55 indirectly abuts the radial surface of the first stepped portion 21 through the elastic sealing body 52. Similar to the seal lip 56, a toothed surface structure that abuts the first inner race 20 may also be formed on the portion of the elastomeric seal body 52 that covers the first section 53.

In the seal assembly according to the present invention, on the first inner ring 20 side, the seal ring 50 achieves sealing with respect to the first inner ring 20 by the skeleton 51 and the portion of the elastic seal body 52 covering the skeleton 51, and on the second inner ring 30 side, the seal ring 50 abuts against the second inner ring 30 by the seal lip 56 elastically extending, thereby forming a seal contact surface. Ideally, the two adjacent bearing rings remain relatively stationary, but in actual operation, slight relative movement (rotational and axial) and offset between the two may occur. During this relative movement and the offset, the sealing ring 50 is fixed to the first inner ring 20 by the rigid framework 51, so that the entire sealing ring 50 remains stationary relative to the first inner ring 20, while the sealing lip 56 can remain in sealing engagement with the second inner ring 30 by elastic deformation. Therefore, the sealing ring 50 has high adaptability to relative movement and offset under actual working conditions, thereby greatly improving the reliability of the sealing effect.

In an alternative embodiment according to the invention, it is also possible to form a larger mounting groove 60 between the two bearing rings, so that the position where the sealing ring 56 abuts the second inner ring 30 can be changed. In particular, when the size of the mounting groove 60 is sufficiently large, the second section 54 may not extend beyond the second step 31, in particular the entire second section 54 may be located radially inside the mounting groove 60. At this time, the free end of the seal lip 56 abuts on the axial surface of the second stepped portion 31.

It should be noted that the mounting groove may also be formed on the radially inner side of the inner ring, or on two adjacent outer rings, depending on the particular sealing requirements and mounting space conditions. The number of rows of such a bearing arrangement is also exemplary and the invention is also applicable to tapered roller bearings or other types of bearings having three, four or more rows of rollers.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

10 outer ring

20 first inner ring

21 first step part

30 second inner ring

31 second step part

40 roller

50 sealing ring

51 skeleton

52 elastomeric seal body

53 first section

54 second section

55 connecting section

56 sealing lip

60 mounting groove