CN113623323A - Sealing device - Google Patents
Sealing device Download PDFInfo
- Publication number
- CN113623323A CN113623323A CN202010385586.3A CN202010385586A CN113623323A CN 113623323 A CN113623323 A CN 113623323A CN 202010385586 A CN202010385586 A CN 202010385586A CN 113623323 A CN113623323 A CN 113623323A
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- CN
- China
- Prior art keywords
- sealing
- lip
- accordion
- section
- connecting section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The present invention relates to a sealing device. The sealing device comprises an annular framework and an elastic sealing body which are coaxially arranged, wherein the elastic sealing body is provided with a main body part and a sealing lip, the main body part is fixed on the framework, and the sealing lip is provided with a free end used for performing contact type sealing and a connecting end opposite to the free end when viewed in a section passing through the central axis of the sealing device. The sealing device of the invention can improve the sealing effect of the sealing lip.
Description
Technical Field
The invention relates to the technical field of sealing. In particular, the present invention relates to a sealing device for dynamic sealing.
Background
In many components that rotate relative to one another, it is necessary to store lubricant for lubrication to prevent overheating and wear. For example, it is often necessary to inject a lubricant such as grease between the inner and outer races of the bearing. In order to achieve a long-term lubricating effect, it is necessary to install a sealing device between the relatively rotating parts to isolate the spaces inside and outside the parts, so as to retain the lubricant inside the sealed space and prevent external contaminants from entering the sealed space.
Common sealing devices currently used for wheel hubs can be seen, for example, in patent documents CN 105864299a and CN 104220768A. Such sealing devices typically include a skeleton and dust cap made of a metallic material and a sealing body made of an elastomeric material. When the sealing device is mounted on a component needing sealing, such as a bearing, the dustproof cover is fixed with the shaft or the bearing inner ring, and the framework is fixed in the hole of the corresponding bearing outer ring. The elastomeric seal is secured to the frame, such as by a vulcanization process, and extends toward the dust cover to form one or more sheet-like sealing lips.
The main one of the sealing lips usually extends obliquely with respect to the axial direction. When the seal is assembled together, as shown in fig. 1, the end of the primary seal lip will abut against the dust cap, forcing the free end of the primary seal lip to bend and deflect radially outward, thereby changing the angle of inclination of the primary seal lip with respect to the axial direction. The tilt angle before assembly is denoted by psi, to
Showing the angle of inclination after assembly, the bending angle of the primary seal lip after assembly can be expressed as
Typically, the angle of inclination after assembly
Should be in the range of 15 deg. to 30 deg.. If the bending angle xi is too large, the assembled inclination angle
Possibly less than 15 deg., the sealing effect of the primary sealing lip will be reduced, which may cause problems in some cases.
Disclosure of Invention
Therefore, an object of the present invention is to provide a sealing device capable of improving the sealing effect of a seal lip.
The above-mentioned technical problem is solved by a sealing device according to the present invention. The sealing device comprises an annular framework and an elastic sealing body which are coaxially arranged, wherein the elastic sealing body is provided with a main body part and a sealing lip, the main body part is fixed on the framework, the sealing lip is provided with a free end used for performing contact type sealing and a connecting end opposite to the free end when viewed in a section passing through the central axis of the sealing device, the elastic sealing body is further provided with a pleated connecting section connected between the connecting end of the sealing lip and the main body part, and the pleated connecting section extends in a continuous broken line shape when viewed in the section passing through the central axis of the sealing device, so that when the free end forms the contact type sealing, the pleated connecting section can shorten the distance of the sealing lip relative to the main body part through elastic deformation.
When the sealing device is assembled in a rotating part, such as a bearing, the free end of the sealing lip will abut against the inner ring of the bearing, the shaft or the dust cap of the sealing device, thereby forming a contact sealing surface. The pressing force from the inner ring or the dust cap will cause the seal lip to undergo bending deformation with respect to the frame. And the accordion-like connecting section connected between the seal lip and the main body portion has a structure similar to an accordion, when the extrusion force acting on the free end of the seal lip is transmitted to the accordion-like connecting section through the seal lip, the accordion-like connecting section will also contract through elastic deformation, so that the seal lip is integrally moved toward the direction close to the main body portion and away from the contact sealing surface, and therefore the degree of bending deformation of the seal lip can be greatly reduced, and even the extension angle when not being extruded can be maintained. This enables the free end of the sealing lip to provide a more positive contact seal.
According to a preferred embodiment of the invention, the accordion-like connection section may be more elastically deformable than the sealing lip, so that when the free end of the sealing lip is pressed, the accordion-like connection section can first be compressed to pull the sealing lip closer to the body portion and away from the contact surface. For example, the thickness of the accordion-like connecting section may be smaller than the thickness of the sealing lip and thus more flexible than the sealing lip. Alternatively, the accordion-like connecting section can also be made of a softer material than the sealing lip.
According to a further preferred embodiment of the invention, the accordion-like connection section may have a V-shaped cross-sectional shape, seen in a cross-section through the centre axis of the sealing device. In this case, the two ends of the V-shape are connected to the main body portion and the connection end, respectively, as viewed in a cross section passing through the center axis of the sealing device. The more the cross-sectional shape of the accordion-like connecting section is bent, the higher the deformability of the accordion-like connecting section as a whole, and if the number of bending times is too large, the contact force between the seal lip and the contact surface may be insufficient, thereby affecting the sealing effect. In addition, too much bending also increases the overall size of the elastic sealing body. Therefore, the number of times of bending of the accordion-like connecting section needs to be appropriately selected according to circumstances. The V-shaped accordion-like connecting section ensures sufficient elastic deformability without excessively reducing the contact force on the sealing lip, and is suitable for most applications. Of course, the W-shaped or other shaped accordion-like connecting sections may be selected as desired.
According to another preferred embodiment of the invention, the main body portion, the sealing lip and the accordion connecting section of the elastic sealing body may be integrally formed. For example, a one-piece annular elastic sealing body may be manufactured using a material such as rubber.
According to a further preferred embodiment of the invention, the sealing device may divide the two axial sides into an outer side and a sealing side, and the elastic sealing body may have at least one further sealing lip, in which case the sealing lip connected to the main body part by the accordion-like connecting section is closer to the sealing side than the further sealing lip, i.e. the sealing lip which is the sealing lip closest to the sealing side. This is because the seal lip closest to the sealing side is usually in direct contact with the liquid inside the sealed space, and is required to have high sealing reliability, and thus is more suitable for being connected to the main body portion using the accordion-like connecting section.
Drawings
The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:
figure 1 shows a schematic view of the assembly of a sealing device according to the prior art;
FIG. 2 shows a cross-sectional view of a sealing device according to an embodiment of the invention; and
fig. 3 shows an assembly schematic of a sealing device according to an embodiment of the invention.
Detailed Description
Hereinafter, a specific embodiment of the sealing device 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 sealing device is provided. The sealing device is applied to a part such as a bearing and the like which rotates relatively, so that two axial sides of the sealing device are divided into a sealing side I and an outer side O. Fig. 2 shows a cross-sectional view of a sealing device according to an embodiment of the invention. As shown in fig. 2, the sealing device includes a frame 10, an elastic sealing body 20 and a dust cap 30, which are coaxially arranged annular members.
The skeleton 10 is made of a rigid material such as metal. The frame 10 is fixed on the radial inner side of the bearing outer ring in an interference fit manner. The carcass 10 has a first axial section 11 and a first radial section 12. The first axial section 11 extends against the inner surface of the bearing outer ring, while the first radial section 12 extends radially inwards from the end of the first axial section 11 facing the sealing side I.
The dust cap 30 is also made of a rigid material such as metal. The dust cap 30 is also fixed radially outside the bearing inner race by interference fit. The dust cap 30 has a second axial section 31 and a second radial section 32. The second axial section 31 abuts the outer surface of the bearing inner ring, while the second radial section 32 extends radially outwards from an end of the second axial section 31 facing the outer side O. This structure of the skeleton 10 and the dust cap 30 constitutes a box-like space as viewed in a section through the center axis of the seal device.
The elastic sealing body 20 is integrally formed of an elastic material such as rubber. The elastic sealing body 20 has a main body portion 21, a first seal lip 22, a second seal lip 23, and an accordion-like connecting section 24. The body portion 21 is fixed to the first radial section 11 of the carcass 10 by means of a vulcanisation process. The first seal lip 22 and the second seal lip 23 each extend from the main body portion 21 toward the dust cap 30 in an annular sheet shape. Wherein the free end of the first sealing lip 22 extends towards the second axial section 31 of the dust cap 30 and the free end of the second sealing lip 23 extends towards the second radial section 32 of the skeleton 30. The first sealing lip 22 directly contacts the sealing side I. The connecting end of the first sealing lip 22 is connected to the main body 21 by an annular accordion connecting section 24. The connecting end of the second seal lip 23 is directly connected to the main body portion 21. As shown in fig. 2, the accordion-like connecting section 24 extends in a continuous fold line shape as viewed in a cross section passing through the center axis of the sealing device. In the present embodiment, the accordion-like connecting section 24 has a V-shaped cross-sectional shape. The two ends of the V-shape are connected to the connecting ends of the main body portion 21 and the first seal lip 22, respectively. The thickness of the accordion-like connecting section 24 is smaller than the thickness of the first seal lip 22.
Fig. 3 shows a state change of the sealing device according to the present embodiment before and after assembly. As shown on the left side in fig. 3, when the skeleton 10 and the dust cover 30 of the sealing device are not assembled together, the free ends of the two seal lips of the elastic sealing body 20 fixed to the skeleton 10 are not subjected to an external force, and therefore, both the seal lips and the accordion-like connecting section 24 are freely stretched. When the skeleton 10 and the dust cover 30 are assembled together, as shown on the right in fig. 3, the free end of the first seal lip 22 will abut on the second axial section 31 of the dust cover 30, while the free end of the second seal lip 23 will abut on the second radial section 32 of the dust cover 30. The dust cap 30 generates a pressing force to the two seal lips, and the two seal lips are deformed and moved by the pressing force. The second sealing lip 23 will be angled approximately about its point of attachment to the main body portion 21. At this time, since the first seal lip 22 is connected to the main body portion 21 via the accordion connecting section 24, the pressing force applied to the free end of the first seal lip 22 is also transmitted to the accordion connecting section 24, so that the accordion connecting section 24 is also deformed. Due to the accordion structure of the accordion-like connecting section 24, it will be readily compressed to shorten its length when subjected to a pressing force, thereby pulling the first seal lip 22 to move toward the body portion 21 and away from the second axial section 31. Furthermore, the thinner thickness of the accordion-like connecting section 24 also makes it easier to elastically deform than the first seal lip 22. In this situationUnder the circumstances, the space between the main body portion 21 and the second axial section 31, in which the first seal lip 22 can extend, is increased, so that the first seal lip 22 is not bent or deflected greatly under the compression of the second axial section 31, and the angle of the first seal lip 22 with respect to the second axial section 31 is not changed greatly before and after the assembly, that is, the angle of the first seal lip 22 with respect to the second axial section 31 is not changed greatly
Or even be
Thus ensuring the sealing effect of the contacting sealing surfaces.
It is to be noted that in the present embodiment, the first seal lip 22 is a seal lip directly contacting the seal side I and the second seal lip 23 is a seal lip near the outer side O, the sealing effect on the contact seal surface of the first seal lip 22 is more required, and therefore the accordion-like connecting section 24 is provided only between the first seal lip 22 and the main body portion 21. However, the accordion-shaped connecting section 24 may be provided between the second seal lip 23 and the main body portion 21 as needed. In fact, the present invention aims to improve the sealing effect after assembly by means of the accordion-like connecting section connected between the sealing lips and the main body part, and therefore the specific number and shape of the sealing lips and between which sealing lips and the main body part the accordion-like connecting section is provided do not constitute a limitation of the scope of protection of the present invention. Such a pleated connecting section may also be applied to a non-cartridge sealing device, that is, a sealing lip connected to the main body portion by the pleated connecting section may also directly abut against the shaft or the bearing inner race. Furthermore, in further embodiments, the accordion-like connecting section 24 may also have a cross-sectional shape that is W-shaped or bent more times. The number of times the accordion-like connecting section 24 is bent can be selected according to the size of the installation space and the pressing force required to contact the sealing surface.
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 framework
11 first axial section
12 first radial segment
20 elastic sealing body
21 main body part
22 first sealing lip
23 second sealing lip
24 accordion-like connecting section
30 dust cap
31 second axial section
32 second radial segment
I sealing side
O outer side
Inclination angle before psi assembly
Angle of xi bend
Claims (7)
1. A sealing arrangement comprising a coaxially arranged annular carcass (10) and an elastic sealing body (20), said elastic sealing body (20) having a main body portion (21) and a sealing lip (22), said main body portion (21) being fixed to said carcass (10), said sealing lip (22) having a free end for making a contact seal and a connecting end opposite to said free end, seen in a cross-section through a central axis of said sealing arrangement,
it is characterized in that the preparation method is characterized in that,
the elastic sealing body (20) further comprises a pleated connecting section (24) connected between the connecting end and the main body portion (21), the pleated connecting section (24) extending in a continuous fold line shape as viewed in a cross section passing through a central axis of the sealing device, so that the pleated connecting section (24) can shorten a distance of the sealing lip (22) with respect to the main body portion (21) by elastic deformation when the free end forms a contact seal.
2. Sealing arrangement according to claim 1, characterized in that the accordion-like connecting section (24) is more elastically deformable than the sealing lip (22).
3. A sealing arrangement according to claim 2, characterized in that the thickness of the accordion-like connecting section (24) is smaller than the thickness of the sealing lip (22).
4. A sealing arrangement according to claim 1, characterized in that the accordion-like connecting section (24) has a V-shaped cross-sectional shape, seen in a cross-section through the centre axis of the sealing arrangement.
5. A sealing device according to claim 4, wherein the two ends of the V-shape are connected to the body portion (21) and the connecting end, respectively, as seen in a cross-section through the centre axis of the sealing device.
6. A sealing arrangement according to claim 1, characterized in that the main body portion (21), the sealing lip (22) and the accordion connecting section (24) of the elastic sealing body (20) are integrally formed.
7. A sealing arrangement according to any one of claims 1-6, characterized in that the sealing arrangement divides the two axial sides into an outer side (O) and a sealing side (I), the elastic sealing body (20) further having at least one further sealing lip (23), the sealing lip (22) connected to the main body portion (21) by the accordion-like connecting section (24) being closer to the sealing side (I) than the further sealing lip (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010385586.3A CN113623323A (en) | 2020-05-09 | 2020-05-09 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010385586.3A CN113623323A (en) | 2020-05-09 | 2020-05-09 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113623323A true CN113623323A (en) | 2021-11-09 |
Family
ID=78377431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010385586.3A Pending CN113623323A (en) | 2020-05-09 | 2020-05-09 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113623323A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220003275A1 (en) * | 2020-07-01 | 2022-01-06 | Aktiebolaget Skf | Sealing device for a bearing unit |
-
2020
- 2020-05-09 CN CN202010385586.3A patent/CN113623323A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220003275A1 (en) * | 2020-07-01 | 2022-01-06 | Aktiebolaget Skf | Sealing device for a bearing unit |
| US11585378B2 (en) * | 2020-07-01 | 2023-02-21 | Aktiebolaget Skf | Sealing device for a bearing unit |
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