WO2023150924A1

WO2023150924A1 - Sealing ring

Info

Publication number: WO2023150924A1
Application number: PCT/CN2022/075619
Authority: WO
Inventors: 刘鑫; 吴丽娟
Original assignee: 舍弗勒技术股份两合公司
Priority date: 2022-02-09
Filing date: 2022-02-09
Publication date: 2023-08-17

Abstract

A sealing ring (1). The sealing ring (1) comprises: a sealing ring main body (11), a radial sealing lip (12), and an axial sealing lip. The radial sealing lip (12) is arranged on the sealing ring main body (11), and the radial sealing lip (12) is used for being in interference fit with the side face of a bearing inner ring (3). The axial sealing lip comprises a first axial sealing lip (131) and a second axial sealing lip (132), the first axial sealing lip (131) and the second axial sealing lip (132) are arranged side by side on the sealing ring main body (11), and the first axial sealing lip (131) and the second axial sealing lip (132) are both used for being in interference fit with the end face of the bearing inner ring (3). The sealing ring (1) can implement dust sealing and lubricating oil sealing at the same time, and has a quite good sealing effect.

Description

sealing ring

technical field

The present application relates to the technical field of sealing structures. More specifically, the present application relates to a sealing ring.

Background technique

As shown in Figure 1 and Figure 2, the shaft 7' of the vibrating screen system works vertically, and the shaft 7' is installed through a bearing. Under the action of gravity, most of the lubricating oil falls into the lower part of the bearing. In order to prevent dust from entering the upper part of the bearing and prevent the lubricating oil from leaking from the lower part of the bearing, sealing rings 1' are respectively installed on the upper part and the lower part of the bearing.

Due to the large radial runout of the shaft 7', the sealing lip of the sealing ring 1' cannot follow the shaft 7' very well, resulting in a gap between the sealing lip and the ring of the shaft 7', therefore, dust may enter the bearing through the gap Inside, lubricating oil may leak from the clearance to the outside of the bearing. In addition, the sealing lip is loaded by the spring 6 ′, which causes a relatively large frictional moment of the sealing ring 1 ′, which will cause severe abrasion of the lip of the sealing lip and reduce the service life of the sealing ring 1 ′.

Contents of the invention

The purpose of the present application is to provide a sealing ring capable of achieving both dust sealing and lubricating oil sealing with good sealing effect.

The application provides a sealing ring, which includes:

seal body;

a radial sealing lip, which is provided on the main body of the sealing ring, and the radial sealing lip is used for interference fit with the side of the inner ring of the bearing;

An axial sealing lip, which includes a first axial sealing lip and a second axial sealing lip, and the first axial sealing lip and the second axial sealing lip are arranged side by side on the sealing ring main body, the Both the first axial sealing lip and the second axial sealing lip are used for interference fit with the end surface of the inner ring of the bearing.

According to an embodiment of the present application, the radial sealing lip and the axial sealing lip are arranged along the radial direction of the sealing ring main body, and the radial sealing lip is located radially relative to the axial sealing lip. On the outside, the lip of the radial sealing lip is located on a radially inward side surface of the radial sealing lip, and the lip of the axial sealing lip is located on an axial end surface of the axial sealing lip.

According to an embodiment of the present application, the first axial sealing lip and the second axial sealing lip are arranged along the radial direction of the sealing ring main body, and the first axial sealing lip is close to the radial seal lip, the second axial sealing lip faces away from the radial sealing lip.

According to an embodiment of the present application, when the sealing ring is arranged at the lower part of the bearing, the first axial sealing lip is used to prevent lubricating oil from leaking out of the bearing;

In the case that the sealing ring is arranged on the upper part of the bearing, the second axial sealing lip is used to prevent dust from entering into the bearing.

According to an embodiment of the present application, the first axial sealing lip and the second axial sealing lip are provided on the main body of the sealing ring through the same waist, and the width of the waist is greater than a preset value.

According to an embodiment of the present application, the first axial sealing lip, the radial sealing lip and parts of the sealing ring main body enclose an accommodation space, and when the sealing ring is arranged on the upper part of the bearing, the The accommodating space is capable of accommodating lubricating oil leaking through a gap between the radial sealing lip and a side surface of the inner ring of the bearing.

According to an embodiment of the present application, the distance from the lip of the first axial sealing lip to the side surface of the bearing inner ring is greater than zero.

According to an embodiment of the present application, the maximum axial compressibility of the first axial sealing lip and the second axial sealing lip are both greater than the maximum axial clearance of the inner ring of the bearing.

According to an embodiment of the present application, the sealing ring further includes a rigid inlay, the main body of the sealing ring is disposed on the rigid inlay, and one end of the rigid inlay is used to connect with the bearing outer ring.

According to an embodiment of the present application, a side of the first axial sealing lip and the second axial sealing lip opposite to the end surface of the bearing inner ring is provided with a polytetrafluoroethylene coating.

In the sealing ring of the present application, it includes a radial sealing lip and an axial sealing lip, and seals from multiple positions and directions (axial and radial), and the radial sealing lip and the axial sealing lip cooperate with each other to form a seal The sealing ring with better effect; and the axial sealing lip includes the first axial sealing lip and the second axial sealing lip, the first sealing lip can realize the sealing of the lubricating oil inside the bearing, and the second axial sealing lip can realize the sealing of the lubricating oil inside the bearing For the dust sealing outside the bearing, the sealing ring can realize dust sealing and lubricating oil sealing at the same time, so the sealing ring of the present application can realize dust sealing and lubricating oil sealing at the same time, and the sealing effect is better.

Description of drawings

Fig. 1 is a schematic diagram of the installation structure of a sealing ring in the related art;

Figure 2 is a partially enlarged view of Figure 1;

Fig. 3 is a schematic diagram of the installation structure of the sealing ring in the embodiment of the present application;

FIG. 4 is a partially enlarged view of FIG. 3 .

Detailed ways

Specific implementation methods according to the present application will be described below with reference to the accompanying drawings. The following detailed description and accompanying drawings are used to illustrate the principles of the present application. The present application is not limited to the described preferred embodiments, and the protection scope of the present application is defined by the claims.

The embodiment of the present application provides a sealing ring 1 , and FIG. 3 is a schematic diagram of the installation structure of the sealing ring 1 in the embodiment of the present application; FIG. 4 is a partially enlarged view of FIG. 3 . As shown in Figure 3 and Figure 4, the seal ring 1 includes a seal ring main body 11, a radial seal lip 12 and an axial seal lip. In this specification, the bearing is installed on the rotating part 5, and "axial" and "radial" are based on The central axis of the sealing ring 1, the central axis of the sealing ring 1 coincides with the rotation axis of the rotating component 5 where the bearing is located.

Wherein, the sealing ring main body 11 is the main part of the sealing ring 1, and the sealing ring main body 11 provides a mounting or bearing basis for other parts of the sealing ring 1, for example, the radial sealing lip 12 and the axial sealing lip are arranged on the sealing ring main body 11 .

Both the radial sealing lip 12 and the axial sealing lip are made of elastic materials. The radial sealing lip 12 and the axial sealing lip are squeezed and deformed after being subjected to an external force, and after the external force disappears, they return to their original shape, so that the radial sealing lip 12 and the axial sealing lip The axial sealing lip can always be in contact with the opposing structural part, thus forming a seal.

The sealing ring main body 11 can be made of the same material as the radial sealing lip 12 and the axial sealing lip, for example, both are elastic materials, and the entire sealing ring 1 can be integrally formed by injection molding. Of course, the sealing ring main body 11 can also be made of other different materials.

The radial sealing lip 12 is provided on the sealing ring main body 11, and the radial sealing lip 12 is used for interference fit with the side of the bearing inner ring 3; during installation, the radial sealing lip 12 is interference fit with the side of the bearing inner ring 3, It can form a seal with the side of the inner ring 3 of the bearing.

The axial sealing lip is arranged on the main body 11 of the sealing ring, and the number of the axial sealing lip is at least two, for example, it can be two, three, or more, and in the case that the number of the axial sealing lip is two Next, the axial sealing lip includes a first axial sealing lip 131 and a second axial sealing lip 132, the first axial sealing lip 131 and the second axial sealing lip 132 are arranged side by side on the sealing ring main body 11, the first axial sealing lip Both the sealing lip 131 and the second axial sealing lip 132 are used for interference fit with the end face of the bearing inner ring 3. The end faces form a seal.

The sealing ring 1 in the embodiment of the present application is provided with a radial sealing lip 12 and an axial sealing lip to perform sealing from multiple positions and directions, and the radial sealing lip 12 and the axial sealing lip cooperate to form a better sealing effect and set at least two axial sealing lips, for example, the axial sealing lip includes a first axial sealing lip 131 and a second axial sealing lip 132, the first sealing lip can realize the lubricating oil inside the bearing Sealing, the second axial sealing lip 132 can realize the sealing of dust outside the bearing, and the sealing ring 1 can realize dust sealing and lubricating oil sealing at the same time, therefore, the sealing ring 1 of the present application can realize dust sealing and lubricating oil sealing at the same time, and The sealing effect is better.

In the embodiment of the present application, the radial sealing lip 12 and the axial sealing lip are arranged along the radial direction of the sealing ring main body 11, and the radial sealing lip 12 is located on the outer side in the radial direction relative to the axial sealing lip, that is, the axial sealing lip The lip is located radially on the inside and the radial sealing lip 12 is located radially on the outside. Such setting can make the radial sealing lip 12 interfere with the side surface of the bearing inner ring 3 and form a seal with the side surface of the bearing inner ring 3 during installation, and the axial sealing lip 12 and the end surface of the bearing inner ring 3 have interference fit and contact with the side surface of the bearing inner ring 3 The end face of the bearing inner ring 3 forms a seal.

The lip of the radial sealing lip 12 is located on the radially inward side of the radial sealing lip 12, the lip of the radial sealing lip 12 is opposite to the side of the inner ring 3 of the bearing, and the lip of the axial sealing lip is located on the side of the axial sealing lip. The axial end face of the lip, the lip of the axial sealing lip is opposite to the end face of the inner ring 3 of the bearing.

In the embodiment of the present application, the first axial sealing lip 131 and the second axial sealing lip 132 are arranged along the radial direction of the sealing ring main body 11, and the first axial sealing lip 131 is close to the radial sealing lip 12, and the second axial sealing lip 132 The sealing lip 132 faces away from the radial sealing lip 12 . The first axial sealing lip 131 and the second axial sealing lip 132 are arranged along the radial direction of the sealing ring main body 11, so that one of the axial sealing lips can prevent the lubricating oil inside the bearing from leaking out of the bearing, and the other axial sealing lip The sealing lip can prevent the dust outside the bearing from entering the bearing. The first axial sealing lip 131 is close to the radial sealing lip 12, and the second axial sealing lip 132 is away from the radial sealing lip 12. Relative to the bearing, the first axial sealing lip 131 faces the inside of the bearing. Therefore, the second axial sealing lip 132 faces away from the radial sealing lip 12. One axial sealing lip 131 can prevent the lubricating oil inside the bearing from leaking out of the bearing, and the second axial sealing lip 132 faces the outside of the bearing, so the second axial sealing lip 132 can prevent the dust outside the bearing from entering the bearing Inside.

Both the upper part and the lower part of the bearing are provided with the sealing ring 1 in the embodiment of the present application. When the sealing ring 1 is arranged at the lower part of the bearing, under the action of gravity, most of the lubricating oil inside the bearing falls into the lower part of the bearing. An axial sealing lip 131 is used to prevent lubricating oil from leaking out of the bearing.

When the sealing ring 1 is arranged on the upper part of the bearing, under the action of gravity, most of the lubricating oil inside the bearing falls into the lower part of the bearing, and there is no lubricating oil in the upper part of the bearing, and the second axial sealing lip 132 is used to prevent the bearing outside Dust gets into the bearing.

Therefore, the sealing ring 1 in the embodiment of the present application can be installed on the upper part of the bearing to prevent dust outside the bearing from entering the bearing, and can be installed on the lower part of the bearing to prevent lubricating oil from leaking out of the bearing. Unify the type of sealing ring 1 used in the upper and lower parts of the bearing, avoid setting one kind of sealing ring on the upper part of the bearing and another different sealing ring on the lower part of the bearing, which will cause more types of seals, and the bearing One kind of sealing ring is set on the upper part, and another different sealing ring is set on the lower part of the bearing. The sealing rings need to be molded separately, the process is complicated and the cost is high. However, the sealing ring 1 in the embodiment of the present application unifies the bearing The type of sealing ring used in the upper and lower parts does not have the above-mentioned problems.

In the embodiment of the present application, the first axial sealing lip 131, the radial sealing lip 12 and the sealing ring main body 11 enclose the accommodation space 15, and when the sealing ring 1 is arranged on the upper part of the bearing, the accommodation space 15 can accommodate Lubricating oil leaking through the gap between the radial sealing lip 12 and the side of the inner ring 3 of the bearing.

Optionally, the first axial sealing lip 131 and the second axial sealing lip 132 are disposed on the main body 11 of the sealing ring through the same waist 14, and the width of the waist 14 is larger than a preset value. That is, the width of the waist portion 14 can ensure that the first axial sealing lip 131 and the second axial sealing lip 132 will not swing greatly when they are impacted by lubricating oil entering the receiving space 15 .

The radial sealing lip 12 has an interference fit with the side of the bearing inner ring 3 and forms a seal with the side of the bearing inner ring 3. For the lubricating oil inside the bearing, the radial sealing lip 12 provides a primary seal. The rotating part 5 where the bearing is located When the radial runout of the bearing inner ring 3 is installed on the rotating part 5, the radial runout of the bearing inner ring 3 will be large. If there is a gap between the side of the bearing inner ring 3 and the radial sealing lip 12, The lubricating oil inside the bearing can enter the accommodation space 15 surrounded by the first axial sealing lip 131, the radial sealing lip 12 and the sealing ring main body 11 through the gap. In the accommodation space 15, the first axial sealing lip 131 and the bearing The sealing between the end faces of the inner ring 3 can prevent the lubricating oil from leaking out of the bearing, that is, the first axial sealing lip 131 can provide a secondary seal. Even if the lubricating oil inside the bearing passes through the radial sealing lip 12, it will still be blocked by the first axial sealing lip 131 to prevent the lubricating oil from leaking out of the bearing.

Further, the distance from the lip of the first axial sealing lip 131 to the side surface of the bearing inner ring 3 is greater than zero. The distance greater than zero can provide a contact space for the first axial sealing lip 131 to form a better seal, and can prevent the lip of the first axial sealing lip 131 from protruding into the above-mentioned accommodating space 15, thereby avoiding lubrication. Oil spill.

The maximum axial compressibility of the first axial sealing lip 131 and the second axial sealing lip 132 is greater than the maximum axial clearance of the bearing inner ring 3 . The maximum axial clearance of the inner ring 3 of the bearing is the same as the maximum axial clearance of the rotating part 5 where the bearing is located, and the maximum compressible amount of the sealing lip in the axial direction can be set to be greater than the maximum axial clearance of the inner ring 3 of the bearing. Ensure that the first axial sealing lip 131 and the second axial sealing lip 132 still have a compressible amount when the bearing inner ring 3 shakes to the maximum extent in the axial direction, so that the first axial sealing lip 131 and the second axial sealing lip 131 and the second axial sealing The lip 132 can still form good contact with the end surface of the bearing inner ring 3, thereby forming a good seal and making the seal reliable.

In the embodiment of the present application, the seal ring 1 also includes a rigid inlay, the seal ring main body 11 is set on the rigid inlay, the rigid inlay can support the seal ring main body 11, and one end of the rigid inlay is used to connect with the bearing The outer ring 4 is connected. Using the sealing ring 1 of the embodiment of the present application, on the outside, one end of the rigid inlay is connected to the bearing outer ring 4, neither the rigid inlay nor the bearing outer ring 4 rotate, and there is no leakage between the two. The sealing lip 12 has an interference fit with the side surface of the bearing inner ring 3 and forms a seal with the side surface of the bearing inner ring 3, and the axial sealing lip has an interference fit with the end face of the bearing inner ring 3 and forms a seal with the end face of the bearing inner ring 3, thereby Realize the sealing of the bearing.

In the embodiment of the present application, the side opposite to the end face of the bearing inner ring 3 of the first axial sealing lip 131 and the second axial sealing lip 132 is provided with a polytetrafluoroethylene coating 16. The polytetrafluoroethylene coating 16 can reduce the friction moment between the first axial sealing lip 131 and the second axial sealing lip 132 and the end surface of the bearing inner ring 3, avoiding the first axial sealing lip 131 and the second axial sealing lip The wear of lip 132, and the PTFE coating 16 can improve the wear resistance of the first axial sealing lip 131 and the second axial sealing lip 132, avoiding the first axial sealing lip 131 and the second axial sealing lip The wear of the lip 132 can prolong the service life of the sealing ring 1.

Further, the side of the radial sealing lip 12 opposite to the side of the bearing inner ring 3 may also be provided with a polytetrafluoroethylene coating 16 to reduce the frictional moment between the radial sealing lip 12 and the side of the bearing inner ring 3 Wear resistance of the radial sealing lip 12.

The sealing ring 1 in the embodiment of the present application has a simple structure, a simple manufacturing process, reliable sealing, and low sealing cost.

As mentioned above, although the exemplary embodiments of the application have been described with reference to the accompanying drawings, the application is not limited to the above specific implementation, and the protection scope of the application should be defined by the claims and their equivalents.

List of reference signs

Sealing ring 1, 1'

Spring 6'

Shaft 7'

Seal body 11

Radial sealing lip 12

First axial sealing lip 131

Second axial sealing lip 132

waist 14

Capacity 15

PTFE coating 16

Bearing inner ring 3

Bearing outer ring 4

Rotating parts 5

Claims

A sealing ring (1), wherein the sealing ring (1) comprises:

Sealing ring main body (11);

a radial sealing lip (12), which is provided on the sealing ring main body (11), and the radial sealing lip (12) is used for interference fit with the side of the bearing inner ring (3);

An axial sealing lip, which includes a first axial sealing lip (131) and a second axial sealing lip (132), and the first axial sealing lip (131) and the second axial sealing lip (132) ) are arranged side by side on the sealing ring main body (11), and the first axial sealing lip (131) and the second axial sealing lip (132) are both used to contact the end surface of the bearing inner ring (3) interference fit.
The sealing ring (1) according to claim 1, wherein the radial sealing lip (12) and the axial sealing lip are arranged along the radial direction of the sealing ring main body (11), and the radial The sealing lip (12) is located radially outside relative to the axial sealing lip, and the lip of the radial sealing lip (12) is located on the radially inward side of the radial sealing lip (12), so The lip of the axial sealing lip is located on the axial end surface of the axial sealing lip.
The sealing ring (1) according to claim 1, wherein the first axial sealing lip (131) and the second axial sealing lip (132) are arranged along the radial direction of the sealing ring main body (11) arranged, and the first axial sealing lip (131) is close to the radial sealing lip (12), and the second axial sealing lip (132) is away from the radial sealing lip (12).
The sealing ring (1) according to claim 3, wherein,

In the case where the sealing ring (1) is arranged at the lower part of the bearing, the first axial sealing lip (131) is used to prevent lubricating oil from leaking out of the bearing;

In the case that the sealing ring (1) is arranged on the upper part of the bearing, the second axial sealing lip (132) is used to prevent dust from entering into the bearing.
The sealing ring (1) according to claim 3, wherein, the first axial sealing lip (131) and the second axial sealing lip (132) are arranged on the sealing ring through the same waist (14) In the main body (11), the width of the waist (14) is greater than a preset value.
The sealing ring (1) according to claim 3, wherein the first axial sealing lip (131), the radial sealing lip (12) and the sealing ring main body (11) are partly enclosed to contain space (15), when the sealing ring (1) is arranged on the upper part of the bearing, the accommodation space (15) can accommodate the radial sealing lip (12) and the bearing inner ring (3) Lubricating oil leaks from the gap between the sides.
The sealing ring (1) according to claim 3, wherein the distance from the lip of the first axial sealing lip (131) to the side of the bearing inner ring (3) is greater than zero.
The sealing ring (1) according to claim 1, wherein the maximum compressible volumes of the first axial sealing lip (131) and the second axial sealing lip (132) in the axial direction are larger than those in the bearing Maximum axial clearance of ring (3).
The seal ring (1) according to claim 1, wherein the seal ring (1) further comprises a rigid inlay, the seal ring main body (11) is arranged on the rigid inlay, and the rigid inlay One end is used to connect with the bearing outer ring (4).
The sealing ring (1) according to claim 1, wherein the end faces of the first axial sealing lip (131) and the second axial sealing lip (132) and the bearing inner ring (3) The opposite side is provided with a polytetrafluoroethylene coating (16).