CN108999977B

CN108999977B - Sealing ring and bearing using same

Info

Publication number: CN108999977B
Application number: CN201710422422.1A
Authority: CN
Inventors: 乔红涛; 卓福海
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-06-06
Filing date: 2017-06-06
Publication date: 2022-07-01
Anticipated expiration: 2037-06-06
Also published as: CN108999977A

Abstract

The embodiment of the invention provides a sealing ring and a bearing using the same, wherein the sealing ring comprises an annular body, and one or more check valves which are opened when the pressure difference that the pressure inside the body exceeds the pressure outside the body exceeds a preset threshold value are arranged on the body. According to the sealing ring and the bearing provided by the embodiment of the invention, when grease is injected into the bearing, the grease is decompressed through the one-way valve when the pressure exceeds a set value, so that the deformation or displacement of the sealing ring caused by overlarge pressure in the bearing is avoided; when grease exists in the bearing, the old grease can be discharged through the one-way valve; by using the sealing ring provided by the embodiment of the invention, a shaft system structure at the outer side of the bearing does not need to be provided with a shaft shoulder for limiting the sealing ring, and a positioning groove for positioning the sealing ring is not needed to be processed on the inner ring of the bearing, so that the processing procedures are reduced, and the machining cost is reduced.

Description

Sealing ring and bearing using same

Technical Field

The invention relates to the field of shafting sealing, in particular to a sealing ring and a bearing using the same.

Background

The sealing ring can be used for sealing a rotating part, so the reliability of the sealing ring is always the technical problem to be solved by the technical personnel in the field; in the practical process, lubricating grease is often required to be injected into the bearing to ensure the lubricity of the bearing and reduce the frictional resistance and the loss caused by friction; in consideration of the requirement of bearing lubrication, a sealing ring is required to be arranged at the end part of the bearing to prevent lubricating grease from leaking; this ensures smooth discharge of the old grease while injecting new grease to maintain good condition of the grease. In the process of injecting lubricating grease into the sealed rotating part, the old grease is discharged smoothly, otherwise, the pressure inside the sealed environment is increased, so that the sealing effect of the sealing ring is affected, even the deformation and displacement of the sealing ring can be caused, and the sealing function is lost.

Disclosure of Invention

In view of the above technical current situation, embodiments of the present invention provide a seal ring and a bearing using the same, which solve the problem of displacement of the seal ring caused by excessive internal pressure of the bearing sealed by the seal ring, and provide a channel for discharging old grease.

According to a first aspect of the embodiments of the present invention, there is provided a seal ring, including an annular body, on which one or more check valves are disposed, the check valves being opened when a pressure difference between an inner side pressure of the body and an outer side pressure of the body exceeds a preset threshold.

Alternatively, the check valve comprises a tubular valve body and an openable valve port at one end of the valve body, and the other end of the valve body is connected with the body in a sealing manner.

Alternatively, the valve port is provided in a tapered shape at a position close to the valve port, so that the middle portion of the valve body protrudes outward, and the valve port is opened at the position where the valve body protrudes.

Optionally, the valve port is in a straight shape, and the valve body is correspondingly set to be in a flat tube shape, or the valve port is in a split structure, and the valve body is correspondingly set to be in a taper tube shape.

Optionally, a wall thickness of the valve body decreases gradually in a direction toward the valve port.

Optionally, the outer surface of the valve body is provided with a reinforcing rib.

Optionally, the bead extends along the valve body in a direction towards the valve port.

Optionally, the body comprises an annular framework positioned on the outer ring and an annular sealing body positioned on the inner ring, the annular sealing body is formed on the annular framework in an cladding mode, the check valve is formed in an opening on the annular framework and extends to the outer side of the body from the position of the opening, and the check valve is tightly connected with the opening; the one-way valve and the annular sealing body are integrally formed, or the one-way valve and the annular sealing body are formed in a split mode.

Optionally, a first sealing lip and a second sealing lip which are arranged side by side are arranged on the radial inner side of the inner ring of the annular sealing body, and a concave accommodating space is formed between the first sealing lip and the second sealing lip.

Optionally, the sealing ring further comprises an annular pre-tightening spring, which is sleeved on the annular sealing body and presses the first sealing lip.

Optionally, an annular groove is formed in the annular sealing body at a position corresponding to the first sealing lip, and the pre-tightening spring is placed in the annular groove.

Optionally, the cross section of the annular skeleton is L-shaped.

Optionally, the annular skeleton is made of metal material.

Optionally, when the body is provided with more than two check valves, the check valves are uniformly arranged around the circumference of the body.

According to a second aspect of the embodiments of the present invention, there is provided a bearing, including two or more sealing rings, which are installed on both sides of the bearing and located between a bearing inner ring and a bearing outer ring, so as to seal a passage between the bearing inner ring and the bearing outer ring.

Optionally, the seal ring is connected with the bearing outer ring through interference fit.

According to the sealing ring and the bearing using the same, when grease is injected into the bearing, the grease is decompressed through the one-way valve when the pressure exceeds a set value, so that the deformation or displacement of the sealing ring caused by overlarge pressure in the bearing is avoided; when grease exists in the bearing, the old grease can be discharged through the one-way valve; by using the sealing ring provided by the embodiment of the invention, a shaft system structure at the outer side of the bearing does not need to be provided with a shaft shoulder for limiting the sealing ring, and a positioning groove for positioning the sealing ring is also not needed to be processed on the inner ring of the bearing, so that the processing procedures are reduced, the machining cost is reduced, the sealing ring has good sealing performance, the grease is conveniently discharged, the mounting is simple and convenient, and the positioning is reliable.

The sealing ring provided by the embodiment of the invention can also be used for sealing non-rotating parts.

The pre-tightening spring can greatly improve the sealing performance of the first lip, can block the erosion of external media, and can prevent the leakage of grease.

Drawings

The invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a seal ring provided in an embodiment of the present invention;

FIG. 2.1 is a front view of a first usage state of the check valve provided by the embodiment of the present invention;

FIG. 2.2 is a side view of a first usage state of the check valve provided by the embodiment of the invention;

FIG. 2.3 is a front view of a second use state of the check valve provided by the embodiment of the invention;

FIG. 2.4 is a side view of a second state of use of the check valve provided by the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a bearing provided in an embodiment of the present invention.

In the figure:

10. a body; 11. an annular skeleton; 12. an annular seal body; 121. a first seal lip; 122. a second seal lip; 123. an annular groove;

20. a one-way valve; 21. a valve body; 22. a valve port;

30. and pre-tightening the spring.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

As shown in fig. 1, 2.1-2.4, an embodiment of the present invention provides a sealing ring, which includes a ring-shaped body 10, and one or more check valves 20 are disposed on the body 10 and are opened when a pressure difference between an inner side pressure of the body 10 and an outer side pressure of the body 10 exceeds a preset threshold.

The sealing ring provided by the embodiment of the invention can be used for sealing a bearing and a sealing shafting structure, when the pressure for injecting grease into the bearing and the sealing shafting structure exceeds a set value, the pressure is released through the one-way valve 20, and the deformation or displacement of the sealing ring caused by overlarge pressure in the bearing and the sealing shafting structure is avoided; when grease exists in the bearing, the existing grease can be discharged by opening the one-way valve; by using the sealing ring provided by the embodiment of the invention, a shaft system structure at the outer side of the bearing does not need to be provided with a shaft shoulder for limiting the sealing ring, and a positioning groove for positioning the sealing ring does not need to be processed on the inner ring of the bearing, so that the processing procedures are reduced, the machining cost is reduced, and the sealing ring has good sealing performance, is convenient for grease discharge, is simple and convenient to install, and is reliable in positioning.

Alternatively, the check valve 20 includes a tubular valve body 21 and an openable valve port 22 at one end of the valve body 21, and the other end of the valve body 21 is sealingly connected to the body 10. The valve body 21 is a tubular structure, and is set in a tapered shape at a position close to the valve port 22, so that the middle part of the valve body protrudes to the outside, and the valve port 22 is opened at the protruding position of the valve body 21. When the pressure difference between the inner side and the outer side of the valve body 21 does not exceed a preset threshold value, the valve port 22 keeps a closed state; when the pressure difference between the inner side and the outer side of the valve body 21 exceeds a preset threshold value, the valve port 22 is pressed to deform and open, so that the pressure relief effect is realized.

Accordingly, the preset threshold may be set according to the material, shape, thickness of the valve body 21 and the shape and size of the valve port 22; accordingly, as understood by those skilled in the art, the stronger the deformation resistance of the material itself, the higher the preset threshold value may be, the greater the thickness of the valve body 21, the stronger its deformation resistance may be, and the valve body 21 may be designed in a shape with strong deformation resistance, so that the valve body obtains a higher preset threshold value; similarly, the smaller the valve port 22, the greater the resistance to deformation, whereas the larger the valve port 22, the lesser the resistance to deformation.

Alternatively, the valve port 22 is in a straight shape, and the valve body 21 may be correspondingly configured into a flat tube shape, so as to improve the deformation resistance of the valve port 22; after the valve port 22 is opened, the high pressure inside the valve body 21 is reduced along with the pressure relief, the pressure difference between the inside and the outside of the valve body 21 is reduced, and when the pressure difference is smaller than a preset threshold value, the valve port 22 is automatically closed, so that the pressure inside the valve body is maintained.

Alternatively, the valve port 22 may be a split structure, such as a three-split structure or a four-split structure, in which the valve body 21 is generally configured in a conical pipe shape, and the split structures are uniformly distributed along the circumferential direction of the meeting point, so that the same pressure-bearing capacity exists between the respective split structures, and when the pressure difference between the inner side of the valve body 21 and the outer side of the valve body 21 reaches a preset threshold, the respective split structures are opened simultaneously.

No matter the valve port 22 is in a straight line shape or in a split structure, the wall thickness of the valve body 21 is gradually reduced toward the valve port 22, so that the valve port 22 is easier to design, and the pressure difference between the two sides of the valve body when the valve port 22 is opened meets the requirement of the preset threshold.

Alternatively, on the basis of the above embodiment, a rib is provided on the outer surface of the valve body 21 to improve the deformation resistance of the valve port 22, and the valve port 22 can be opened when the pressure difference reaches the preset threshold value by the design of the rib.

Alternatively, the rib extends along the valve body 21 toward the valve port 22, so that the rib can provide a better supporting function, and ensure that the pressure difference between the two sides of the valve body can meet higher requirements when the valve port is opened.

In this embodiment, the whole body 10 may be an integrally formed rubber material, or a composite structure may be selectively used; the check valves 20 may be provided in one or more than two, and when there are provided more than two check valves 20, the check valves 20 are uniformly arranged around the circumference of the body 10.

Alternatively, the body 10 includes an annular frame 11 at the outer periphery and an annular seal body 12 at the inner periphery, the annular seal body 12 is over-molded on the annular frame 11, and the check valve 20 is molded on the annular frame 11 and extends to the outside of the body 10. Annular skeleton 11 is used for with the hole interference fit of bearing inner race, provides the support for annular seal 12 simultaneously, increases the structural strength of whole sealing washer. Optionally, the check valve 20 and the annular sealing body 120 are integrally formed, so that not only can the check valve 20 and the annular sealing body 120 be formed at one time, and the process links are reduced, but also the connection between the annular sealing body 120 and the annular framework 11 can be more stable; alternatively, the check valve 20 and the annular sealing body 120 may be formed separately, or different materials may be used for the annular sealing body 120 and the check valve 20, respectively, and particularly, suitable materials and processing techniques may be selected according to the structural characteristics and the use requirements of the check valve 20.

Alternatively, a hole may be formed in the annular plate surface of the annular frame 11, and the check valve 20 may be installed in the hole; the inner edge of the annular plate surface of the annular framework 11 can also be grooved, and the check valve 20 can be installed in the groove.

As will be appreciated by those skilled in the art, the check valve 20 may be integrally formed with the annular sealing body 12 or may be separately formed.

Alternatively, the radial inner side of the inner ring of the annular sealing body 12 is provided with a first sealing lip 121 and a second sealing lip 122 which are arranged side by side, and a concave accommodating space is formed between the first sealing lip 121 and the second sealing lip 122, and the accommodating space can be used for accommodating lubricating grease. The first sealing lip 121 can play a role in tensioning and sealing, so that grease leakage at the inner side of the annular sealing body 12 is effectively prevented, and external pollutants are prevented from entering the inside of a sealed component (a bearing or shafting structure) through the first sealing lip 121; the second sealing lip 122 adopts a gradually transitional arc surface structure and is bent towards the direction of the first sealing lip 121 to form a one-way sealing structure, so that grease on the inner side of the second sealing lip 122 can only enter between the first sealing lip 121 and the second sealing lip 122 along the second sealing lip 122, and grease and pollutants between the first sealing lip 121 and the second sealing lip 122 can be prevented from entering the inner side of the second sealing lip 122; an annular cavity is formed between the first seal lip 121 and the second seal lip 122, and a part of lubricating grease can be stored to seal a passage between the two seal lips, so that the sealing performance is better.

Optionally, the sealing ring further includes an annular pre-tightening spring 30, and the pre-tightening spring 30 is sleeved on the annular sealing body 12 and presses the first sealing lip 121. The preload spring 30 applies a preload force to the first seal lip 121, so that the first seal lip 121 can be ensured to obtain a better sealing effect.

Alternatively, an annular groove 123 is provided in the annular sealing body 12 at a position corresponding to the first sealing lip 121, and the pretensioned spring 30 is disposed in the annular groove 123. The pre-tightening spring 30 is positioned by the annular groove 123, and the pre-tightening spring 30 is prevented from slipping.

The preload spring 30 can greatly improve the sealing performance of the first sealing lip 121, and can prevent erosion of external media and leakage of grease.

Alternatively, the cross-section of annular skeleton 11 is L shape, and annular skeleton 11 can closely cooperate with the inner wall in bearing inner race inner wall or shaft hole on the whole, and through the annular skeleton structural design of L shape, can make annular skeleton 11 bigger with the area of contact of the cooperation position that corresponds to ensure annular skeleton 11's fixed effect better.

Alternatively, the annular frame 11 is made of a metal material, and in particular, may be made of a metal with high deformation resistance, such as steel, or may be formed by casting an aluminum alloy, so that the annular frame 11 may provide a more stable support.

Optionally, when a plurality of check valves 20 are disposed on the body 10, the check valves 20 are uniformly arranged around the circumference of the body 10, so that the sealing ring can discharge old grease at a plurality of positions, and long-term accumulation of local grease is avoided.

As shown in fig. 3, an embodiment of the present invention further provides a bearing, which includes two or more sealing rings provided in the embodiments, where the two sealing rings are installed on two sides of the bearing and located between the bearing inner ring and the bearing outer ring to seal a channel between the bearing inner ring and the bearing outer ring. The end part of the bearing is sealed through the sealing ring, so that the inside and the outside of the bearing are isolated, a dustproof effect can be achieved, and the problems of sealing failure and leakage caused by deformation or displacement of the sealing ring due to overlarge pressure inside the bearing can be prevented when grease is injected into the bearing.

Optionally, in this embodiment, the seal ring is connected with the bearing outer ring by interference fit, so that the seal ring is tightly fitted with the bearing outer ring, and the seal ring is prevented from shifting due to bearing of a large pressure.

It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various parts appearing in the claims may be implemented by a single hardware or software module. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A sealing ring comprises an annular body (10), and is characterized in that one or more one-way valves (20) which are opened when the pressure difference that the pressure inside the body (10) exceeds the pressure outside the body (10) exceeds a preset threshold value are arranged on the body (10), the body (10) comprises an annular framework (11) positioned on an outer ring and an annular sealing body (12) positioned on an inner ring, the annular sealing body (12) is formed on the annular framework (11) in an cladding mode, the one-way valves (20) are formed in holes in the annular framework (11) and extend to the outer side of the body (10) from the hole positions, and the one-way valves (20) are tightly connected with the holes; the one-way valve (20) and the annular sealing body (12) are integrally formed.

2. Sealing ring according to claim 1, characterized in that the non-return valve (20) comprises a tubular valve body (21) and an openable valve port (22) at one end of the valve body (21), the other end of the valve body (21) being sealingly connected to the body (10).

3. The gasket according to claim 2, wherein the gasket is provided in a tapered shape at a position close to the valve port (22) so that a middle portion of the valve body (21) protrudes outward, and the valve port (22) is opened at a position where the valve body (21) protrudes.

4. Sealing ring according to claim 2 or 3, characterized in that the valve port (22) is in-line and the valve body (21) is correspondingly arranged in the shape of a flat tube, or the valve port (22) is in a split-type structure and the valve body (21) is correspondingly arranged in the shape of a conical tube.

5. Sealing ring according to claim 4, characterized in that the wall thickness of the valve body (21) decreases gradually in the direction of the valve port (22).

6. A seal ring according to claim 2, characterized in that the outer surface of the valve body (21) is provided with ribs.

7. Sealing ring according to claim 6, characterized in that the bead extends in the direction of the valve body (21) towards the valve port (22).

8. A sealing ring according to claim 1, characterized in that the radial inner side of the inner ring of the annular sealing body (12) is provided with a first sealing lip (121) and a second sealing lip (122) side by side, and a concave accommodating space is formed between the first sealing lip (121) and the second sealing lip (122).

9. The sealing ring according to claim 8, characterized in that the sealing ring further comprises an annular pre-tightening spring (30), the pre-tightening spring (30) is sleeved on the annular sealing body (12) and presses the first sealing lip (121), an annular groove (123) is formed in the annular sealing body (12) at a position corresponding to the first sealing lip (121), and the pre-tightening spring (30) is placed in the annular groove (123).

10. A seal ring according to claim 1, characterized in that when more than two check valves (20) are provided on the body (10), the check valves (20) are arranged evenly around the circumference of the body (10).

11. A bearing comprising two sealing rings according to any one of claims 1 to 10, mounted on opposite sides of the bearing between an inner bearing ring and an outer bearing ring to seal a passage between the inner bearing ring and the outer bearing ring.

12. The bearing of claim 11, wherein the seal ring is coupled to the bearing outer race by an interference fit.