CN109899401A - Sealing device - Google Patents
Sealing device Download PDFInfo
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- CN109899401A CN109899401A CN201811266269.9A CN201811266269A CN109899401A CN 109899401 A CN109899401 A CN 109899401A CN 201811266269 A CN201811266269 A CN 201811266269A CN 109899401 A CN109899401 A CN 109899401A
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- CN
- China
- Prior art keywords
- sealing
- lip
- sealing lip
- segment
- radial
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Abstract
The present invention relates to a kind of sealing devices for dynamic sealing being placed in shaft member.The sealing device includes the skeleton being set in shaft member, elastic sealed body and dustproof cover, elastic sealed body is connect close to one end of hydraulic seal side with skeleton, dustproof cover has axial segment and radial segment, axial segment is set in shaft member on the inside of elastic sealed body, radial segment is radially extended since axial segment is close to one end of outer side to skeleton, section inclination extends to form the first sealing lip and extends to form the second sealing lip to radial segment inclination elastic sealed body in the axial direction, first sealing lip is bendingly connected in axial segment to form face contact sealing towards hydraulic seal side elasticity；Second sealing lip is bendingly connected in radial segment to form face contact sealing towards radial outside elasticity.Sealing device of the invention can reduce the frictional force of dynamic sealing surface while guaranteeing sealing effect.
Description
Technical field
The present invention relates to sealing device fields.In particular it relates to a kind of for shaft member or the sealing device of bearing.
Background technique
As dynamic support component, the grease for lubrication is usually contained in bearing.The grease in bearing is let out in order to prevent
It drains in other component, it usually needs sealing device is installed in bearing end to carry out dynamic sealing.Existing bearing seal dress
It sets and usually elastic packing lip is resisted against on dustproof cover by the elastic force of ring spring, to realize sealing effect.Such as CN
Anti-dust seal disclosed in 206129896 U, spring are set in second side on the outer diameter of lip, thus by second side to lip
Seal convexity and the evagination flanging of the cover clamp, and the first side is abutted to lip, second side to the end of lip with the cover,
To form multi-touch sealing.But using for spring makes the frictional force between dustproof cover and sealing lip larger, is not easy to pacify
It fills and is prone to wear out, sealing reliability is lower.
Summary of the invention
Therefore, the technical problem to be solved in the invention be to provide one kind being capable of reduction while guaranteeing sealing effect
The sealing device of frictional force on dynamic sealing surface.
Above-mentioned technical problem is resolved by a kind of sealing device according to the present invention.The sealing device includes being arranged
Skeleton, elastic sealed body and dustproof cover in shaft member, elastic sealed body are connect close to one end of hydraulic seal side with skeleton, are prevented
Dirt lid has axial segment and radial segment, and axial segment is set in shaft member on the inside of elastic sealed body, radial segment from
Axial segment starts to radially extend to skeleton close to one end of outer side, and section inclination extends to form the to elastic sealed body in the axial direction
One sealing lip and the second sealing lip is extended to form to radial segment inclination, wherein the first sealing lip is towards hydraulic seal side bullet
Property is bendingly connected in axial segment, so that forming face connects between the elastic bending part section and axial segment of the first sealing lip
Touching sealing；Second sealing lip is bendingly connected in radial segment towards radial outside elasticity, thus in the bullet of the second sealing lip
Property bending section and radial segment between formed face contact sealing.Two sealing lip elasticity are bendingly connected to the surface of dustproof cover
On, bending section can form the contact surface with certain development length with dust-proof cap surface, thus by existing sealing device
Approximate line contact is changed into face contact, guarantees the sealing effect of contact surface by elastic force caused by sealing lip bent upon itself
Fruit, it is convenient to omit spring substantially reduces extruding force and frictional force on sealing surface, can reduce the abrasion of contact surface, simultaneously
It ensure that good dynamic sealing effect.
According to a preferred embodiment of the present invention, elastic sealed body also have the first sealing lip and the second sealing lip it
Between to dustproof cover inclination extend support lip, sealing device assemble complete when, supporting between the end of lip and dustproof cover has
Gap.Preferably, when the first sealing lip is by axial compressive force, support lipped joint touches radial segment.Additionally preferably, when second is close
When sealing lip by radial pressure, support lipped joint touches axial segment.Sealing device assemble complete and sealing lip not by excessive outer
When portion squeezes, support between lip and dustproof cover there are certain gap so that the first sealing lip, the second sealing lip and dustproof cover it
Between the space that surrounds form labyrinth flow-path, certain labyrinth seal function is played to the liquid leaked into the space.And when the
When one sealing lip or the second sealing lip are by external compression, flexible deformation occurs for elastic sealed body, so that support lip abutting is dust-proof
The radial segment or axial segment of lid to play a supporting role to the first and second sealing lips, while connecing with dustproof cover formation
Touching sealing.
According to another preferred embodiment of the invention, the first sealing lip, the second sealing lip and support lip are from elastic sealed body
On same position at start to extend, and the first sealing lip and the second sealing lip mutual extrusion.Due to the first sealing lip and
Two sealing lips elasticity bending outward respectively, so that the two acts on the elastic force direction phase in this coextensive starting point
Instead, the two mutual extrusion forms stable support construction, at the same the first sealing lip, the second sealing lip and support lip share it is same
Extend starting point, so that the elasticity of entire elastic sealed body is higher, while guaranteeing the sealing effect of sealing surface, further drops
Pressure and friction on low contact sealing surface.
According to another preferred embodiment of the invention, the shape on the primary sealing area that the first sealing lip is contacted with axial segment
At there is the first oil drive back thread.Preferably, the first oil drive back thread can be labyrinth oil drive back thread or spiral oil return line.Correspondingly, close second
The second oil drive back thread is formed on the secondary sealing area that envelope lip is contacted with radial segment.Preferably, the second oil drive back thread may be fan
Palace oil drive back thread or spiral oil return line.Labyrinth oil drive back thread can further strengthen the sealing effect of sealing surface, and spiral oil return line is another
It is outer that there is the pump efficiency for making leakage liquid flow back to answer.
According to another preferred embodiment of the invention, the first sealing lip and the second sealing lip are flake.It is laminar close
Sealing lip has higher elasticity, and pressure and friction on contact sealing surface can be reduced while guaranteeing sealing effect.
Detailed description of the invention
The present invention is further described below in conjunction with attached drawing.The identical member of function is represented with identical appended drawing reference in figure
Part.Wherein:
Fig. 1 shows the cross-sectional view of sealing device according to an embodiment of the invention；
Fig. 2 shows the cross-sectional views of sealing device according to another embodiment of the present invention；
Fig. 3 shows the cross-sectional view of sealing device according to another embodiment of the present invention；
Fig. 4 a shows the pressure-plotting on the contact sealing surface of sealing device according to prior art；With
Fig. 4 b shows the pressure-plotting on the contact sealing surface of sealing device according to the present invention.
Specific embodiment
The specific embodiment of sealing device according to the present invention is described below with reference to attached drawing.Following detailed description and
Attached drawing is for illustratively illustrating the principle of the present invention, the present invention is not limited to described preferred embodiment, protection of the invention
Range is defined by the claims.
Fig. 1 is shown according to one embodiment of present invention.As shown in Figure 1, sealing device includes skeleton 1, elastic sealed body 2
With dustproof cover 3, above three part is cyclic structure.In Fig. 1, the left side of sealing device is hydraulic seal side, and right side is
Outer side, sealing device are mounted on shaft member or bearing 12, to prevent the liquid leakage of hydraulic seal side to outer side or outer
The dust of portion side invades hydraulic seal side.Dustproof cover 3 has the axial segment 7 axially extended and the radial direction radially extended
Section 8.The inside of axial segment 7 and shaft member 12, which are formed, to be interference fitted, to keep dustproof cover 3 and shaft member 12 relatively fixed one
It rises.Radial segment 8 is radial towards the skeleton 1 for being set in 3 outside of dustproof cover since axial segment 7 is close to one end of outer side
Extend.
Skeleton 1 is rigid structure, is set in the outermost of sealing device.Elastic sealed body 2 is by rubber or other bullets
Property material made of elastic construction, elastic sealed body 2 is radially connected with each other close to one end of hydraulic seal side with skeleton 1,
And tilt and extend towards dustproof cover 3, thus form the sealing lip of two thin slices shape, i.e. the first sealing lip 4 and the second sealing lip 5.
Flaky texture makes sealing lip be easy to bendingly be connected on dustproof cover 3.Wherein, axis of first sealing lip 4 towards dustproof cover 3
Extend to section 7 and is rolled towards hydraulic seal oblique.A part of first sealing lip 4 is bendingly abutted towards outer side elasticity
In axial segment 7, to form face contact sealing between the bending section and axial segment 7 of the first sealing lip 4, i.e., the
The contact sealing surface with certain axial extension is formed between the bending section of one sealing lip 4 and axial segment 7.Accordingly
The radial segment 8 on ground, the second sealing lip 5 towards dustproof cover 3 extends and tilts towards radial outside.The one of second sealing lip 5
It is partially toward radial outside elasticity to be bendingly connected in radial segment 8, thus in the bending section and radial direction of the second sealing lip 5
Face contact sealing is formed between section 8, i.e., being formed between the bending section and radial segment 8 of the second sealing lip 5 has centainly
Radially extend the contact sealing surface of length.In addition, the inclined lateral surface of the second sealing lip 5 also has centrifugal action, can make outer
The dust on boundary prevents the pollution to hydraulic seal side far from contact sealing surface.It is contacted in the first sealing lip 4 with axial segment 7
It is formed with the first oil drive back thread 9 on primary sealing area, and the shape on the secondary sealing area that the second sealing lip 5 is contacted with radial segment 8
At there is the second oil drive back thread 10.First oil drive back thread 9 and/or the second oil drive back thread 10 can be labyrinth oil drive back thread, so that contact-enhancing is close
The dynamic sealing effect of cover.Alternatively, the first oil drive back thread 9 and/or the second oil drive back thread 10 or spiral oil return line, spiral are returned
Oily line can should would leak into the enclosure space formed between the first sealing lip 4, the second sealing lip 5 and dustproof cover 3 by pump efficiency
In liquid or slush pump send hydraulic seal side or outer side back to.In addition, another alternate embodiment as shown in Figure 2, the
Oil-recovery tank can not also be formed on the contact sealing surface of one sealing lip 4 and/or the second sealing lip 5.
Elastic sealed body 2 also has the branch extended between the first sealing lip 4 and the second sealing lip 5 to the inclination of dustproof cover 3
Support lip 6.When sealing device assembles completion, when the first sealing lip 4 and the second sealing lip 5 are not affected by biggish external pressure, branch
Supportting has certain gap between lip 6 and dustproof cover 3.At this point, the presence of support lip 6 makes the first sealing lip 4, the second sealing lip
Closed space forms tortuous labyrinth channel between 5 and dustproof cover 3, plays labyrinth seal to the liquid leaked into the space
Effect.When outer side there are more muddy water deposit in the radial outside of the second sealing lip 5, elastic sealed body 2 can be applied
Add radial pressure, the axial part for elastically deforming inward so that elastic sealed body 2 is whole, and then lip 6 being supported to be connected to dustproof cover 3
In section 7.At this moment, support lip 6 play the role of radial support to the second sealing lip 5, while between axial segment 7 formation contact it is close
Envelope, and then improve sealing effect.It similarly, can be to first such as when the fluid temperatures such as the lubricant of hydraulic seal side are higher
Sealing lip 4 forms biggish axial compressive force so that the flexible deformation to the right of elastic sealed body 2, and then will support lip 6 be connected to it is dust-proof
In the radial segment 8 of lid 3.At this moment, support lip 6 plays axial supporting role to the first sealing lip 4, at the same with radial segment 8 it
Between formed contact sealing, and then improve sealing effect.
Preferably, the first sealing lip 4, the second sealing lip 5 and support lip 6 are since at the same position of elastic sealed body 2
Extend, this common extension starting point is known as waist 11.Since the root of the first sealing lip 4 and the second sealing lip 5 passes through waist
Portion 11 links together, while the reversed bending outward respectively of the free end of the two, bend generation elastic force make it is first close
Envelope lip 4 and the second sealing lip 5 squeeze mutually at waist 11, form stable support construction, and the two and dustproof cover 3 connect
The sealing effect of touching sealing surface is also strengthened.In addition, due to the first sealing lip 4, the second sealing lip 5 and supporting lip 6 by waist
11 as common extension starting point, so that the elasticity of entire elastic sealed body 2 is higher, while guaranteeing sealing effect, into
One step reduces the pressure and friction on contact sealing surface.In addition, another alternate embodiment as shown in Figure 3, the second sealing lip 5
Extension starting point can also be separated with the first sealing lip 4.
Fig. 4 a and Fig. 4 b respectively illustrate the sealing device of the prior art and sealing device according to an embodiment of the present invention exists
Contact the pressure-plotting on sealing surface.Left end in distribution map corresponds to the first sealing lip 4 axially outermost or second
The radially end of sealing lip 5.As can be seen, since to be bent to form face contact type close for laminar sealing lip elasticity of the invention
Envelope contacts the pressure maximum at the outermost end (corresponding to the left end in curve graph) of sealing surface and pressure distribution curve than existing skill
Art is more precipitous, and sealing effect is more preferably.In addition, being bent to form due to contacting sealing surface by the elasticity of sealing lip, so ought be most
When the contact sealing surface in outside is worn, the position of elastic folding force can move inward automatically, to bring to abrasion
Sealing effect loss play the role of self-compensating.
Although being illustratively described possible embodiment in the above description it should be appreciated that arrive, still through institute
With the presence of the variation of technical characteristic known and that furthermore technical staff is readily apparent that and a large amount of embodiments of combination of embodiment.
Furthermore it should also be understood that illustrative embodiment is as just an example, this embodiment never limits in any form
Protection scope of the present invention, application and construction processed.It is more that one kind is provided to technical staff for converting by preceding description
The technological guidance of at least one illustrative embodiments, wherein, can be into without departing from the protection scope of claims
Row various changes, especially with respect to the component function and structure in terms of change.
Appended drawing reference table
1 skeleton
2 elastic sealed bodies
3 dustproof covers
4 first sealing lips
5 second sealing lips
6 support lips
7 axial segments
8 radial segments
9 first oil drive back threads
10 second oil drive back threads
11 waists
12 shaft member or bearing
Claims (10)
1. one kind is placed in the sealing device on shaft member (12) for dynamic sealing, including being set on the shaft member (12)
Skeleton (1), elastic sealed body (2) and dustproof cover (3), the elastic sealed body (2) close to hydraulic seal side one end with it is described
Skeleton (1) connection, the dustproof cover (3) have axial segment (7) and radial segment (8), and the axial segment (7) is in the bullet
Property seal (2) on the inside of be set on the shaft member (12), the radial segment (8) is from the axial segment (7) close to outer
One end of portion side starts to radially extend to the skeleton (1), and elastic sealed body (2) Xiang Suoshu axial segment (7) inclination is prolonged
It stretches to form the first sealing lip (4) and extend to form the second sealing lip (5) to the radial segment (8) inclination,
It is characterized in that,
First sealing lip (4) is bendingly connected on the axial segment (7) towards hydraulic seal side elasticity, thus
Face contact sealing is formed between the elastic bending part section and the axial segment (7) of first sealing lip (4)；
Second sealing lip (5) is bendingly connected on the radial segment (8) towards radial outside elasticity, thus described
Face contact sealing is formed between the elastic bending part section and the radial segment (8) of second sealing lip (5).
2. sealing device according to claim 1, which is characterized in that the elastic sealed body (2) also has described the
The support lip (6) extended between one sealing lip (4) and second sealing lip (5) to the dustproof cover (3) inclination, described close
When seal apparatus assembly is completed, there is gap between the end and the dustproof cover (3) of support lip (6).
3. sealing device according to claim 2, which is characterized in that when first sealing lip (4) is by axial compressive force
When, the support lip (6) contacts the radial segment (8).
4. sealing device according to claim 2, which is characterized in that when second sealing lip (5) is by radial pressure
When, the support lip (6) contacts the axial segment (7).
5. sealing device according to claim 2, which is characterized in that first sealing lip (4), second sealing lip
(5) and support lip (6) from the same position on the elastic sealed body (2) extend, and it is described first sealing
Lip (4) and second sealing lip (5) mutual extrusion.
6. sealing device according to claim 1, which is characterized in that in first sealing lip (4) and the axial part
The first oil drive back thread (9) are formed on the primary sealing area of section (7) contact.
7. sealing device according to claim 6, which is characterized in that first oil drive back thread (9) be labyrinth oil drive back thread or
Spiral oil return line.
8. sealing device according to claim 1, which is characterized in that in second sealing lip (5) and the radial part
The second oil drive back thread (10) are formed on the secondary sealing area of section (8) contact.
9. sealing device according to claim 8, which is characterized in that second oil drive back thread (10) be labyrinth oil drive back thread or
Spiral oil return line.
10. according to claim 1 to sealing device described in one of 9, which is characterized in that first sealing lip (4) and described
Second sealing lip (5) is flake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266269.9A CN109899401A (en) | 2018-10-29 | 2018-10-29 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266269.9A CN109899401A (en) | 2018-10-29 | 2018-10-29 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109899401A true CN109899401A (en) | 2019-06-18 |
Family
ID=66943247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811266269.9A Pending CN109899401A (en) | 2018-10-29 | 2018-10-29 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109899401A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112695824A (en) * | 2020-12-15 | 2021-04-23 | 天津包博特密封科技有限公司 | Self-cleaning type mud suction inlet sealing structure of trailing suction hopper dredger |
| WO2023150924A1 (en) * | 2022-02-09 | 2023-08-17 | 舍弗勒技术股份两合公司 | Sealing ring |
| CN116857292A (en) * | 2023-09-05 | 2023-10-10 | 万向钱潮股份公司 | Universal joint precision bearing |
-
2018
- 2018-10-29 CN CN201811266269.9A patent/CN109899401A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112695824A (en) * | 2020-12-15 | 2021-04-23 | 天津包博特密封科技有限公司 | Self-cleaning type mud suction inlet sealing structure of trailing suction hopper dredger |
| CN112695824B (en) * | 2020-12-15 | 2022-03-01 | 天津包博特密封科技有限公司 | Self-cleaning type mud suction inlet sealing structure of trailing suction hopper dredger |
| WO2023150924A1 (en) * | 2022-02-09 | 2023-08-17 | 舍弗勒技术股份两合公司 | Sealing ring |
| CN116857292A (en) * | 2023-09-05 | 2023-10-10 | 万向钱潮股份公司 | Universal joint precision bearing |
| CN116857292B (en) * | 2023-09-05 | 2023-11-24 | 万向钱潮股份公司 | Universal joint precision bearing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190618 |
|
| WD01 | Invention patent application deemed withdrawn after publication |