CN116357667A - Sealing member, bearing assembly and vibrating screen system comprising same - Google Patents

Abstract

There is provided a sealing member for sealing a space between a first member and a second member, comprising: a skeleton (111); a first seal lip which is connected to a seal lip connection portion (111E) of the skeleton (111) and which protrudes obliquely from the seal lip connection portion (111E) toward the radially inner side and the axially one side; and a second seal lip connected to the seal lip connection portion (111E) and projecting obliquely from the seal lip connection portion (111E) toward the radially inner side and the axially other side. The lip of the first seal lip is formed in a ring-like shape having a uniform thickness, the lip of the second seal lip is formed in a ring-like shape having a uniform thickness, and the seal lip connecting portion (111E), the first seal lip and the second seal lip are integrally formed in a herringbone shape in an axial section of the seal member.

Description

Sealing member, bearing assembly and vibrating screen system comprising same

Technical Field

The present application relates to the field of seals, and in particular to a sealing member, a bearing assembly and a shaker screen system including the sealing member.

Background

Fig. 1A shows a cross-sectional view of a portion of the structure of a shaker system, and fig. 1B shows a cross-sectional view of a sealing member of the shaker system of fig. 1A.

Bearings 100 such as tapered roller bearings (TAROL) are widely used in shaker systems such as in construction machinery. The shaft 200 of the shaker system operates vertically. Under the action of gravity, most of the grease falls to the lower part of the bearing. In order to prevent dust from entering the upper part of the bearing and grease from leaking from the lower part of the bearing, sealing members 110 are respectively installed at the upper and lower parts of the bearing.

In the example shown in fig. 1A and 1B, the bearing 100 is a double row tapered roller bearing, which includes an inner race 120, an outer race 130, rollers 140, and a cage 150. The inner race 120 is tightly fitted over the shaft 200, and ferrules (holders) 160 for holding the axial position of the inner race 120 on the shaft 200 are provided on both axial sides of the inner race 120, respectively.

Two sealing members 110 are mounted between outer race 130 and two ferrules 160. The sealing member 110 may include a backbone 111, a sealing lip 112, and a spring 113. One end of the frame 111 is fixed to the outer ring 130, a seal lip 112 is provided to the other end of the frame 111, and a spring 113 pressurizes the seal lip 112 to bring the seal lip 112 into contact with the collar 160, thereby sealing a space between the outer ring 130 and the collar 160.

Fig. 2 schematically illustrates the gap between the collar 160 and the sealing lip 112.

Since the radial runout of the shaft 200 of the shaker screen is very large, the sealing lip 112 does not follow the shaft 200 well, resulting in a random gap 300 between the sealing lip 112 and the collar 160, and thus grease may leak from the gap 300.

Furthermore, the sealing lip 112 is loaded by the spring 113, so that the friction torque of the seal is particularly high, which will lead to severe lip wear, reducing the service life of the seal and the bearing.

Disclosure of Invention

The present application has been made in view of the state of the art described above. It is an object of the present application to provide a sealing member, a bearing assembly and a shaker system including the sealing member, which can cope with large radial runout.

There is provided a sealing member for sealing a space between a first member and a second member, comprising:

a backbone having one end for mounting to the second member;

a first seal lip connected to a seal lip connection portion of the other end of the skeleton and extending obliquely from the seal lip connection portion toward a radially inner side and an axial side for forming a contact seal with the first member; and

a second seal lip connected to the seal lip connection portion of the skeleton and projecting obliquely from the seal lip connection portion toward the radially inner side and the axially other side for forming a contact seal with the first member,

wherein the lip of the first seal lip is formed in a ring-shaped sheet shape having a uniform thickness, the lip of the second seal lip is formed in a ring-shaped sheet shape having a uniform thickness, and the seal lip connecting portion, the first seal lip and the second seal lip are integrally formed in a herringbone shape in an axial section of the seal member.

In at least one embodiment, the length of the lip of the first sealing lip is 3 to 20 times the thickness of the lip of the first sealing lip; and/or

The length of the lip of the second sealing lip is 3 to 20 times the thickness of the lip of the second sealing lip.

In at least one embodiment, the length of the lip of the first sealing lip is 5 to 15 times the thickness of the lip of the first sealing lip; and/or

The length of the lip of the second sealing lip is 5 to 15 times the thickness of the lip of the second sealing lip.

In at least one embodiment, the length of the lip of the first sealing lip and the length of the lip of the second sealing lip are equal.

In at least one embodiment, the first sealing lip and/or the second sealing lip comprises or consists of a polytetrafluoroethylene layer.

In at least one embodiment, the first sealing lip is comprised of polytetrafluoroethylene and the second sealing lip is comprised of rubber.

In at least one embodiment, the backbone comprises an annular portion from which the sealing lip connection extends radially inward of the sealing member, the second sealing lip being bonded to the sealing lip connection, the first sealing lip being bonded or glued to the second sealing lip or the sealing lip connection.

In at least one embodiment, the surface of the lip of the first sealing lip opposite the second sealing lip has a plurality of grooves, and/or

The surface of the lip of the second sealing lip opposite to the first sealing lip has a plurality of grooves.

There is also provided a bearing assembly comprising:

a bearing; and

according to the sealing member of the present application,

wherein the outer race of the bearing constitutes the second member.

There is further provided a vibrating screen system comprising:

a shaft; and

according to the bearing assembly of the present application,

wherein the shaft or a ferrule that is sleeved over the shaft constitutes the first member.

In the above-described sealing member, the lip of the first sealing lip and the lip of the second sealing lip are formed in a ring-like shape having a uniform thickness, and in an axial section of the sealing member, the sealing lip connecting portion, the first sealing lip and the second sealing lip are integrally formed in a "chevron" shape. In this way, the lip of the seal lip is formed thin and long, and can have good flexibility, and can accommodate radial runout of the first member of the shaft, for example, and improve the sealing effect.

Drawings

Fig. 1A shows a cross-sectional view of a portion of the structure of a shaker system.

FIG. 1B shows a cross-sectional view of one sealing member of the shaker system of FIG. 1A.

Fig. 2 schematically illustrates the gap between the collar and the sealing lip of the shaker system of fig. 1A.

Fig. 3 shows a cross-sectional view of a sealing member according to one embodiment of the present application.

Fig. 4A and 4B are schematic views showing an operating state of the sealing member of fig. 3 when mounted to the vibrating screen system shown in fig. 1A.

Description of the reference numerals

100. Bearing

110. Sealing member

111. Skeleton frame

111B large diameter portion

111S small diameter portion

111E seal lip connection

112. Sealing lip

113. Spring

114. Rubber lip

Inner peripheral portion of 114I rubber lip

Peripheral portion of 114O rubber lip

115. Polytetrafluoroethylene lip

Inner peripheral portion of 115I polytetrafluoroethylene lip

Outer peripheral portion of 115O polytetrafluoroethylene lip

120. Inner ring

130. Outer ring

140. Roller

150. Retainer

160. Ferrule

200. Shaft

300. Gap of

Axis A axis

R radial direction

C circumference direction

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 this application, the circumferential direction C, the radial direction R and the axial direction a may refer to the circumferential direction, the radial direction and the axial direction of the sealing member, respectively, which coincide with the circumferential direction, the radial direction and the axial direction of the bearing or the shaft to which the sealing member may be mounted.

Referring to fig. 3-4B, the present application provides a sealing member 110 with a rubber lip and a Polytetrafluoroethylene (PTFE) lip. The sealing member 100 may include a backbone 111, a polytetrafluoroethylene lip 115 (an example of a first sealing lip), and a rubber lip 114 (an example of a second sealing lip).

The skeleton 111 may be made of metal or include metal. One end of the backbone 111 may be secured to the outer race 130 of the bearing (see fig. 1A), for example, secured to the outer race 130 by an interference fit. A rubber lip 114 and a polytetrafluoroethylene lip 115 are provided to the other end of the backbone 111, and the rubber lip 114 and the polytetrafluoroethylene lip 115 may be in contact with a ferrule 160 (see fig. 1A), thereby sealing a space between the outer ring 130 and the ferrule 160.

It will be appreciated that the collar 160 is not necessary, at least on one axial side of the bearing 100 (see fig. 1A), for example, the inner ring 120 of the bearing 100 may abut against a shoulder of the shaft 200 in the axial direction a. In this application, the sealing lip may be in direct contact with the shaft 200 or in contact with the collar 160 on the shaft 200. Accordingly, in the present application, the sealing lip is in contact with the shaft 200, or the sealing member 110 seals a space between the shaft 200 and the outer ring 130, including the sealing lip is in contact with a member such as the collar 160 that is externally sleeved to the shaft 200, or the sealing member 110 seals a space between the collar 160 and the like that is externally sleeved to the shaft 200 and the outer ring 130.

The skeleton 111 has a substantially cylindrical shape. In the axial section shown in fig. 3, the skeleton 111 is stepped. The skeleton 111 may include: an annular large diameter portion 111B located at one axial end; an annular small diameter portion 111S connected to the large diameter portion 111B; and a seal lip connecting portion 111E connected to the small diameter portion 111S and bent toward the radial inner side. Here, the large diameter portion 111B and the small diameter portion 111S may be collectively referred to as an annular portion. It is understood that the backbone 111 may include only one annular portion (e.g., the large diameter portion 111B) and the seal lip connection portion 111E. Alternatively, the small diameter portion 111S may be a tapered portion (or referred to as a tapered ring portion, included in the concept of the annular portion of the present application).

The seal lip connection portion 111E is provided at the other end in the axial direction of the skeleton 111. The seal lip connection 111E extends along the radial direction R and the circumferential direction C (see fig. 2) of the seal member 110.

An outer peripheral portion 114O (connecting portion) of the rubber lip 114 is connected to the seal lip connecting portion 111E, for example, vulcanization is adhered or glued to the seal lip connecting portion 111E. An inner peripheral portion 114I (lip) of the rubber lip 114 extends obliquely from the seal lip connecting portion 111E toward the radially inner side and the axially other side (lower side in fig. 3).

An outer peripheral portion 115O (connecting portion) of the polytetrafluoroethylene lip 115 is connected to the seal lip connecting portion 111E, for example, glued to the seal lip connecting portion 111E. An inner peripheral portion 115I (lip) of the polytetrafluoroethylene lip 115 extends obliquely from the seal lip connection portion 111E toward the radially inner side and the axially one side (upper side in fig. 3).

In the example shown in fig. 3, the outer peripheral portion 114O of the rubber lip 114 is bonded to both axial sides of the seal lip connecting portion 111E at the same time, the outer peripheral portion 115O of the polytetrafluoroethylene lip 115 is bonded to the outer peripheral portion 114O of the rubber lip 114, for example, the outer peripheral portion 114O of the rubber lip 114 is bonded to the vulcanization while the rubber lip 114 is vulcanized, or the outer peripheral portion 115O of the polytetrafluoroethylene lip 115 may be glued to the outer peripheral portion 114O of the rubber lip 114.

The sealing surface of the rubber lip 114 (the surface facing the lip of the collar 160/polytetrafluoroethylene lip 115) may have a plurality of grooves to give the rubber lip 114 good flexibility to easily follow the movement of the shaft 200 (collar 160). Of course, a groove may be provided in the non-sealing surface (surface facing away from the ferrule 160) of the inner peripheral portion 114I of the rubber lip 114.

At least the lip of the rubber lip 114 may be provided in a ring-like shape. The thickness of the lip of the rubber lip 114 may be uniform (i.e., the thickness of the lip varies from location to location) with the groove being omitted. In one example, the length of the lip of the rubber lip 114 (the length extending from the seal lip connection 111E) may be 3 to 20 times, more preferably 5 to 15 times, the thickness thereof (the groove is omitted).

The sealing surface of the polytetrafluoroethylene lip 115 (the surface facing the lip of the ferrule 160/rubber lip 114) may have a plurality of grooves to give the polytetrafluoroethylene lip 115 good flexibility to easily follow the movement of the shaft 200 (the ferrule 160). Of course, a groove may be provided in the non-sealing surface (surface facing away from the ferrule 160) of the inner peripheral portion 115I of the polytetrafluoroethylene lip 115.

The entire polytetrafluoroethylene lip 115 or at least the lip of the polytetrafluoroethylene lip 115 may be provided in a ring-like shape. The lip of the polytetrafluoroethylene lip 115 or the thickness of the entire polytetrafluoroethylene lip 115 may be uniform (the grooves are omitted). In one example, the length of the lip of the polytetrafluoroethylene lip 115 (the length protruding from the seal lip connecting portion 111E or the outer peripheral portion 114O of the rubber lip 114) may be 3 to 20 times, more preferably 5 to 15 times, the thickness thereof (the groove is omitted).

The length of the lip of the rubber lip 114 and the length of the lip of the polytetrafluoroethylene lip 115 may be equal. In the axial cross section of the seal member shown in fig. 3, the seal lip connection portion 111E, the rubber lip 114, and the polytetrafluoroethylene lip 115 are integrally formed in a herringbone or Y shape.

Referring to fig. 4A and 4B, although the rubber lip 114 and polytetrafluoroethylene lip 115 in the present application are longer, the distal end (the end remote from the collar 160) or the distal end and the middle portion of the lip thereof is still in contact with the collar 160 or the shaft, unlike some applications in which only the middle portion of the lip is in contact with the sealed member.

The rubber lip 114 and the polytetrafluoroethylene lip 115 (hereinafter, sometimes simply referred to as seal lips) are thin and long, which makes the seal lips have good flexibility. At the same time, the groove on the sealing lip also makes the sealing lip more flexible. In addition, the grooves may seal some grease to prevent it from leaking.

Fig. 4A and 4B show the lower position of the bearing 100. When the vibrating screen rotates, at a certain moment, as shown in fig. 4A, the distance between the frame 111 and the collar 160 is large on the radial side, and there is still enough contact area between the seal lip and the collar 160 so that grease hardly leaks.

At this time, as shown in fig. 4B, on the other side in the radial direction (the side 180 degrees different from the one in the radial direction), the distance between the skeleton 111 and the ferrule 160 is small, and the overlap between the seal lip and the ferrule 160 is larger than when the shaft 200 is in the neutral position (the position where it does not jump), but the ferrule 160 does not collide with the skeleton 111.

Here, when the runout of the shaft 200 is randomly varied, the seal lip may radially contact the shaft 200 (the collar 160) and swing with the shaft 200. The interference of the sealing lip with the shaft 200 (collar 160) when the shaft 200 is in the neutral position will be greater than the maximum axial runout of the shaft 200 so that the sealing lip can always be in radial contact with the shaft 200 (collar 160).

The sealing member is a low friction seal, particularly a low friction polytetrafluoroethylene lip 115, because of its thinness and flexibility. This allows the sealing member 110 and the bearing 100 to operate for a long time.

The sealing member of the present application may be used at one axial end or both axial ends of the bearing 100. In the top position of the bearing 100, the sealing member is mounted on the bearing to prevent external contaminants from entering the bearing.

The sealing member of the present application, including the bearing assembly of the sealing member, may be, but is not limited to, used in a shaker screen system.

Some of the advantageous effects of the above-described embodiments of the present application are described below.

(i) The sealing member has the advantages of simple manufacturing process, few parts, convenient installation and low cost.

(ii) The sealing component is suitable for the shaft with larger radial runout and the bearing.

(iii) The sealing member has small friction and long service life.

(iv) The sealing performance is high, and the life of a sealed member such as a bearing can be improved.

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. Next, supplementary explanation will be made.

(i) In the above embodiments, the seal member of the present application is described as being suitable for use in shafts and bearings having large radial runout. Of course, the present application is not limited thereto. For example, the sealing member of the present application may also be used for sealing between a housing and a shaft. Here, the shaft may be referred to as a first member that is sealed, and the bearing (outer race) or housing may be referred to as a second member that is sealed.

(ii) Both sealing lips may be made of rubber or of polytetrafluoroethylene, or one sealing lip may be made of rubber and polytetrafluoroethylene together. For example, at least the sealing surface of one sealing lip has a polytetrafluoroethylene layer.

(iii) The sealing member may also include additional sealing lips, such as contact or non-contact sealing lips between the rubber lip 114 and the polytetrafluoroethylene lip 115 in fig. 3.

(iv) The sealing member of the present application does not use a spring that presses the sealing lip.

(v) In addition to the sealing member and shaker screen system described above, the present application also provides a bearing assembly including a bearing and at least one sealing member described above. The bearing assembly may be, but is not limited to being, used in a shaker system.

Claims (10)

1. A sealing member for sealing a space between a first member and a second member, comprising:

a backbone (111) having one end for mounting to the second member;

a first seal lip connected to a seal lip connecting portion (111E) of the other end of the skeleton (111) and extending obliquely from the seal lip connecting portion (111E) toward a radially inner side and an axial side for forming a contact seal with the first member; and

a second seal lip connected to the seal lip connecting portion (111E) of the skeleton (111) and projecting obliquely from the seal lip connecting portion (111E) toward the radially inner side and the axially other side for forming a contact seal with the first member,

wherein the lip of the first seal lip is formed in a ring-like shape having a uniform thickness, the lip of the second seal lip is formed in a ring-like shape having a uniform thickness, and the seal lip connecting portion (111E), the first seal lip and the second seal lip are integrally formed in a herringbone shape in an axial section of the seal member.

2. The sealing member of claim 1, wherein a length of the lip of the first sealing lip is 3 to 20 times a thickness of the lip of the first sealing lip; and/or

The length of the lip of the second sealing lip is 3 to 20 times the thickness of the lip of the second sealing lip.

3. The sealing member of claim 2, wherein a length of the lip of the first sealing lip is 5 to 15 times a thickness of the lip of the first sealing lip; and/or

The length of the lip of the second sealing lip is 5 to 15 times the thickness of the lip of the second sealing lip.

4. The sealing member of claim 1, wherein a length of the lip of the first sealing lip and a length of the lip of the second sealing lip are equal.

5. The sealing member according to claim 1, wherein the first sealing lip and/or the second sealing lip comprises or consists of a polytetrafluoroethylene layer.

6. The sealing member of claim 1, wherein the first sealing lip is comprised of polytetrafluoroethylene and the second sealing lip is comprised of rubber.

7. The sealing member according to claim 6, wherein the skeleton (111) comprises an annular portion (111B, 111S), the sealing lip connection (111E) extending from the annular portion (111B, 111S) towards a radially inner side of the sealing member (110), the second sealing lip being bonded to the sealing lip connection (111E), the first sealing lip being bonded or glued to the second sealing lip or the sealing lip connection (111E).

8. The sealing member of claim 1, wherein a surface of the lip of the first sealing lip opposite the second sealing lip has a plurality of grooves, and/or

The surface of the lip of the second sealing lip opposite to the first sealing lip has a plurality of grooves.

9. A bearing assembly, comprising:

a bearing; and

the sealing member according to any of claim 1 to 8,

wherein the outer race of the bearing constitutes the second member.

10. A shaker system, comprising:

a shaft; and

the bearing assembly of claim 9,

wherein the shaft or a ferrule that is sleeved over the shaft constitutes the first member.

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