CN111379789A - Bearing and sealing device - Google Patents
Bearing and sealing device Download PDFInfo
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- CN111379789A CN111379789A CN202010352767.6A CN202010352767A CN111379789A CN 111379789 A CN111379789 A CN 111379789A CN 202010352767 A CN202010352767 A CN 202010352767A CN 111379789 A CN111379789 A CN 111379789A
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- lip
- annular stop
- annular
- sealing
- seal
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- 238000007789 sealing Methods 0.000 title claims abstract description 148
- 239000000428 dust Substances 0.000 claims abstract description 40
- 239000004568 cement Substances 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
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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
- 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
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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
- F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
- F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
- F16C33/7866—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element with sealing lips
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Of Bearings (AREA)
Abstract
The embodiment of the invention provides a bearing and a sealing device, wherein the sealing device comprises: the framework is of an annular structure as a whole, and a sealing lip is fixed at the radial part of the framework; the dustproof ring is coaxially arranged with the framework, the radial part of the dustproof ring and the radial part of the framework are axially arranged at intervals, the dustproof ring and the framework enclose an accommodating cavity extending along the axial direction, and the sealing lip and the dustproof ring form sealing; the first annular stop lip is fixed on the framework, is positioned in the accommodating cavity and positioned on the outer side of the sealing lip, and extends in the direction far away from the sealing lip; the second annular stop lip is fixed on the radial part of the dust ring, is positioned in the accommodating cavity, extends in the direction far away from the sealing lip, and is positioned on at least one same cross section, or is positioned on at least one same-radius circumferential surface, so that the sealing performance of the sealing device is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of bearing sealing, in particular to a bearing and a sealing device.
Background
A cartridge type sealing device is generally used to seal a wheel bearing of a vehicle to protect rolling bodies of the wheel bearing from dirt such as muddy water, dust, rainwater, etc., which enters from the outside.
When dirt is introduced into the seal, either by external or environmental influences, wear of the seal is increased, the service life of the seal is shortened, and the risk of wheel bearing failure is increased.
Therefore, how to improve the sealing performance of the sealing device to prolong the service life of the sealing device becomes a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is to improve the sealing performance of the sealing device.
To solve the above problem, an embodiment of the present invention provides a sealing device, including:
the framework is of an annular structure integrally and comprises a framework radial part, and a sealing lip is fixed on the framework radial part;
the dustproof ring is coaxially arranged with the framework and comprises a dustproof ring radial part, the dustproof ring radial part and the framework radial part are axially arranged at intervals, an accommodating cavity extending along the axial direction is defined by the dustproof ring and the framework, and the sealing lip and the dustproof ring form sealing;
the first annular stop lip is fixed on the framework, is positioned in the accommodating cavity and positioned on the outer side of the sealing lip, and extends in the direction far away from the sealing lip;
the second annular stop lip is fixed in the radial portion of dust ring, the second annular stop lip is located hold the intracavity, the second annular stop lip is to keeping away from the direction of seal lip extends, first annular stop lip with the second annular stop lip is located at least one same cross section, perhaps the lip of first annular stop lip with the lip of second annular stop lip is located at least one same radial periphery.
Optionally, the lip of the first annular stop lip and the lip of the second annular stop lip are located on at least one circumferential surface of the same radius, the lip of the first annular stop lip and the lip of the second annular stop lip having a gap in the axial direction of the sealing device.
Optionally, the outer annular surface of the first annular stop lip is a conical annular surface.
Optionally, the outer annular surface of the second annular stop lip is a conical annular surface.
Optionally, on a longitudinal section of the sealing device, an included angle between a straight line on which an outer annular surface of the first annular stop lip is located and an axis of the sealing device is equal to an included angle between a straight line on which an outer annular surface of the second annular stop lip is located and the axis.
Optionally, the lip of the first annular stop lip has an inner diameter equal to the inner diameter of the lip of the second annular stop lip, and the lip of the first annular stop lip has an outer diameter equal to the outer diameter of the lip of the second annular stop lip.
Optionally, the dust ring further comprises a dust ring axial portion, and the dust ring axial portion and the dust ring radial portion are fixedly connected;
the seal lip includes:
first seal lip and second seal lip, the second seal lip is located the outside of first seal lip, the second annular backstop lip is located the outside of second seal lip, first seal lip butt in dust ring axial portion, the second seal lip butt in dust ring radial portion.
Optionally, the skeleton still includes skeleton axial region, skeleton axial region with skeleton radial region fixed connection, first annular backstop lip is fixed in skeleton radial region.
Optionally, the sealing lip further comprises:
a third sealing lip disposed on an inner side of the first sealing lip.
In order to solve the above problem, an embodiment of the present invention further provides a bearing, including: the sealing device comprises a bearing inner ring, a bearing outer ring and the sealing device, wherein the framework is in interference fit with the bearing outer ring, and the dustproof ring is in interference fit with the bearing inner ring.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
according to the sealing device provided by the embodiment of the invention, the framework is fixed with the first annular stop lip positioned on the outer side of the sealing lip, the radial part of the dust ring is fixed with the second annular stop lip positioned on the outer side of the sealing lip, the dust ring and the framework are coaxially arranged and enclose into the accommodating cavity extending along the axial direction, as the first annular stop lip and the second annular stop lip both extend towards the direction far away from the sealing lip, after the sealing device is installed on the bearing, once dirt such as external cement, rainwater and the like enters the accommodating cavity, the dirt firstly falls into the outer surfaces of the first annular stop lip and the second annular stop lip, when the bearing rotates, relative motion is generated between the framework and the dust ring, relative rotation is generated between the first annular stop lip and the second annular stop lip, and under the action of centrifugal force, one of the first annular stop lip and the second annular stop lip which rotates can enable the cement falling on the outer surface to be discharged, Dirt such as rainwater and the like is thrown out, so that the sealing performance of the sealing device is improved; on the other hand, because the first annular stop lip and the second annular stop lip are located on at least one same cross section, or the lip edge of the first annular stop lip and the lip edge of the second annular stop lip are located on at least one circumferential surface with the same radius, a labyrinth seal can be formed between the first annular stop lip and the second annular stop lip, the flow rate of dirt such as cement rainwater flowing between the first annular stop lip and the second annular stop lip is reduced, the impact force on the sealing lip in the accommodating cavity is reduced, and the sealing performance of the sealing device is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a cross-sectional view of a sealing device;
FIG. 2 is a cross-sectional view of a seal provided by an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of a sealing device provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of the sealing device according to the present invention;
FIG. 5 is a schematic view of another operating condition of the sealing device provided by the embodiment of the present invention;
fig. 6 is a schematic view of the principle of fig. 5.
Wherein: 1-a framework; 11-a carcass axial portion; 12-a carcass radial portion; 2-a dustproof ring; 21-axial part of the dust ring; 22-a dust collar radial portion; 31-a first sealing lip; 32-a second sealing lip; 4-bearing inner race; 5-bearing outer ring;
10-a framework; 100-a first annular stop lip; 101-a carcass axial portion; 102-a carcass radial portion; 20-a dust ring; 200-a second annular stop lip; 201-axial part of dust ring; 202-dust collar radial portion; 30-sealing lip; 310-a first sealing lip; 320-a second sealing lip; 330-third sealing lip; 40-a bearing inner race; 50-bearing outer ring.
Detailed Description
As is clear from the background art, the sealing performance of the current sealing devices is not good.
The reason for the poor sealing performance of the sealing device is analyzed by combining the sealing device.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sealing device.
As shown in fig. 1, a sealing device includes: the framework 1, the dust ring 2 and the framework radial part 12 are fixedly provided with a first sealing lip 31 and a second sealing lip 32, wherein the first sealing lip 31 and the dust ring axial part 21 form a seal, and the second sealing lip 32 and the dust ring radial part 22 form a seal. When the sealing device is mounted on a wheel bearing, the frame axial portion 11 is fixed to the bearing outer ring 5, and the dust-proof ring axial portion 21 is fixed to the bearing inner ring 4. When the wheel bearing is operated in a muddy environment, a certain amount of muddy water may fill the space above the second seal lip and may even intrude into the space between the second seal lip 32 and the first seal lip 31. As the water in the cement evaporates from these spaces, mud, sand and other dirt can remain in the spaces. Such dirt causes considerable wear to the first and second seal lips 31, 32 when the shaft rotates, thereby greatly reducing the sealing performance.
In order to improve the sealing performance of the sealing device, the embodiment of the invention provides a sealing device, and the technical solution in the embodiment of the invention will be clearly and completely described below with reference to the drawings in the embodiment of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the indication of the direction or the positional relationship referred to in the present specification is based on the direction or the positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and it is not intended to indicate or imply that the indicated device must have a specific direction, be configured in a specific direction, and thus, should not be construed as limiting the present invention.
Referring to fig. 2, fig. 2 is a cross-sectional view of a sealing device according to an embodiment of the present invention.
As shown in fig. 2, a sealing device according to an embodiment of the present invention includes:
the framework 10 is of an annular structure as a whole, the framework 10 comprises a framework radial part 102, and the framework radial part 102 is fixedly provided with the sealing lip 30;
the dustproof ring 20 is coaxially arranged with the framework 10, the dustproof ring 20 comprises a dustproof ring radial part 202, the dustproof ring radial part 202 and the framework radial part 102 are arranged at intervals along the axial direction, the dustproof ring 20 and the framework 10 enclose an accommodating cavity extending along the axial direction, and the sealing lip 30 and the dustproof ring 20 form sealing;
a first annular stop lip 100 fixed to the frame 10, the first annular stop lip 100 being located in the accommodating cavity and outside the seal lip 30, the first annular stop lip 100 extending in a direction away from the seal lip 30;
a second annular stop lip 200 fixed to the radial portion 202 of the dust ring, the second annular stop lip 200 being located in the accommodating cavity, the second annular stop lip 200 extending in a direction away from the seal lip, the first annular stop lip 100 and the second annular stop lip 200 being located on at least one same cross section, or a lip of the first annular stop lip 100 and a lip of the second annular stop lip 200 being located on at least one same radius circumferential surface.
Where the direction a shown in fig. 2 is the axial direction of the cartridge type seal device, the direction R is the radial direction of the cartridge type seal device, and dirt such as cement, dust, etc. is located on the right side of the seal device.
It should be noted that, the first annular stop lip 100 is located outside the seal lip 30, which means that the first annular stop lip 100 is closer to the outside than the seal lip 30, when dirt such as outside cement enters the accommodating cavity, the dirt first contacts the first annular stop lip 100, and the first annular stop lip 100 serves as a first sealing barrier to play a sealing role. The first annular stop lip 100 extends in a direction away from the sealing lip, which means that the diameter of the outer peripheral surface of the free end of the first annular stop lip 100 is greater than or equal to the diameter of the outer peripheral surface of the fixed end of the first annular stop lip 100. The fixed end of the first annular stop lip 100 refers to the end fixedly connected to the frame 10, and the free end of the first annular stop lip 100 refers to the end including the lip. Through making first annular backstop lip 100 to keeping away from seal lip 30's direction extends, can prevent to fall into the sealed intracavity between first annular backstop lip 100 and the seal lip along the free end whereabouts under the action of gravity for filths such as cement that fall into first annular backstop lip 100 outer peripheral face, moreover, when first annular backstop lip 100 rotates, can also play the effect of throwing away filths such as cement that will fall into first annular backstop lip 100 outer peripheral face, reduce mud, large granule such as sand gets into and holds the possibility that the intracavity led to the fact the wearing and tearing to the seal lip, thereby sealing device's sealing performance has been improved.
The first annular stop lip 100 refers to a stop lip having an annular structure as a whole, and of course, as for a longitudinal section of the first annular stop lip 100, a line corresponding to the outer peripheral surface of the first annular stop lip 100 may be a straight line or a curved line. As long as it can be ensured that the outer peripheral surface of the first annular stopper lip 100 extends in a direction away from the seal lip.
In one particular embodiment of the present invention,for the convenience of processing, the outer annular surface of the first annular stop lip 100 is a conical annular surface. On a longitudinal section of the sealing device (as shown in fig. 3), the angle δ formed by the line of the outer annular surface of the first annular stop lip 100 and the axis of the sealing device1Is between 0 ° and 90 °, e.g. delta1Can be 60 degrees, 45 degrees, 30 degrees, 10 degrees or 5 degrees, and the person skilled in the art can determine the delta according to the actual working condition1。
Similarly, the second annular stop lip 200 is located the outside of seal lip, indicates that second annular stop lip 200 is closer to the external world than the seal lip, and when filth such as external cement got into and holds the chamber, the filth at first contacted second annular stop lip 200, second annular stop lip 200 plays sealed effect as first sealed barrier. The second annular stop lip 200 extends in a direction away from the seal lip, which means that the diameter of the outer peripheral surface of the free end of the second annular stop lip 200 is greater than or equal to the diameter of the outer peripheral surface of the fixed end of the second annular stop lip 200. The fixed end of the second annular stopper lip 200 refers to the end fixedly connected to the dust ring 20, and the free end of the second annular stopper lip 200 refers to the end including the lip. Through making second annular backstop lip 200 to keeping away from seal lip's direction extends, can prevent to fall into the sealed intracavity between second annular backstop lip 200 and the seal lip along free end under the action of gravity filth such as cement that falls into second annular backstop lip 200 outer peripheral face, moreover, when second annular backstop lip 200 rotates, can also play the effect that filth such as cement that will fall into second annular backstop lip 200 outer peripheral face were thrown away, reduce mud, large granule such as sand gets into and holds the possibility that the intracavity led to the fact wearing and tearing to seal lip, thereby sealing device's sealing performance has been improved.
The first annular stop lip 200 is an annular structure, and as for a longitudinal section of the second annular stop lip 200, a line corresponding to the outer circumferential surface of the second annular stop lip 200 may be a straight line or a curved line. In one embodiment, the outer annular surface of the second annular stop lip 200 is a tapered annular surface for ease of manufacturing. In the direction of the longitudinal section of the sealing means (as shown in figure 3)Shown), the angle δ formed by the line of the outer annular surface of the second annular stop lip 200 and the axis of the sealing device2Is between 0 ° and 90 °, e.g. delta2Can be 60 degrees, 45 degrees, 30 degrees, 10 degrees or 5 degrees, and the person skilled in the art can determine the delta according to the actual working condition2。
In one embodiment, the outer annular surface of the second annular stop lip 200 is a tapered annular surface for ease of manufacturing. On a longitudinal section of the sealing device (as shown in fig. 3), the included angle δ between the line of the outer annular surface of the second annular stop lip 200 and the axis is2Is between 0 ° and 90 °.
It should be noted that, the first annular stop lip 100 and the second annular stop lip 200 are located on at least one same cross section, which means that the projections of the first annular stop lip 100 and the second annular stop lip 200 on the axis are overlapped, and may be partially overlapped or completely overlapped.
The lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 are located on at least one circumferential surface with the same radius, which means that the projections of the first annular stop lip 100 and the second annular stop lip 200 in the direction perpendicular to the axis overlap, and may be partially overlapped or completely overlapped.
Referring to fig. 3 and 4, in one embodiment, the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 are located on at least one circumferential surface of the same radius, and the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 have a gap S in the axial direction of the sealing device.
Due to the abrupt change of the section caused by the gap S, when dirt such as external cement rainwater flows into the gap along the inlet of the gap S (the opening above the gap in figure 4), on one hand, the flow of muddy water can be slowed down due to the abrupt contraction of the opening at the inlet of the gap S, on the other hand, irregular flowing turbulence can occur at the outlet (the opening below the gap in figure 4), partial water pressure can be decomposed, the impact force of advection on the sealing lip is slowed down, and the service life of the sealing lip is prolonged.
The size of the opening of the gap S is not limited, and it is easily understood that the smaller the gap S is, the more advantageous the sealing performance of the sealing device is.
It can be seen that, by ensuring that the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 are located on at least one circumferential surface with the same radius, on one hand, the first annular stop lip and the second annular stop lip can be ensured to cooperate to form a labyrinth seal, and the possibility of external cement and other dirt entering the sealing device is reduced; on the other hand, the extension lengths of the first annular stopper lip 100 and the second annular stopper lip 200 can be shortened, thereby saving materials and reducing the cost.
When the entire cartridge seal is below water level, a certain hydrostatic pressure is present at the first and second annular stop lips 100, 200. Under this pressure, as shown in fig. 5, the first annular stopper lip 100 and the second annular stopper lip 200 are both bent in the axial direction, so that the gap between the first annular stopper lip 100 and the second annular stopper lip 200 is defined by the gap S1Reduced to the gap S2Thereby enhancing the labyrinth sealing effect of the first annular stop lip 100 and the second annular stop lip 200 and improving the sealing performance. This is explained below in conjunction with fig. 6.
As shown in FIG. 6, taking the first annular stop lip 100 as an example, l1The outer diameter, δ, of the first annular stop lip 100 is shown1Which indicates the angle between the line of the outer circumferential surface of the first annular stop lip 100 and the axis of the sealing device when not subjected to water pressure, in a longitudinal section of the sealing device (see fig. 3).
The included angle between the straight line of the outer annular surface of the first annular stopper lip 100 and the axis of the sealing device after receiving the water pressure is shown. k is a radical of1When the angle is represented by delta1Is reduced to
Then, the projection of the first annular stopper lip 100 in the axial direction increases by a distance.
For the same reason, with2The outer diameter, δ, of the second annular stop lip 200 is shown2Which represents the angle between the line of the outer annular surface of the second annular stop lip 200 and the axis of the sealing device when not subjected to water pressure, in a longitudinal section of the sealing device (as shown in fig. 3).
The included angle between the line of the outer annular surface of the second annular stop lip 200 and the axis of the sealing device after the water pressure is applied is shown. k is a radical of2When the angle is represented by delta2Is reduced to
Then, the projection of the second annular stopper lip 200 in the axial direction increases by a distance.
S2＝S1-k1-k2
→S2＝S1-l1(cos(δ1-γ1)-cosδ1)-l2(cos(δ2-γ2)-cosδ2)
→S2＜S1
It can be seen that when the entire cartridge seal is below water level, a certain hydrostatic pressure is present at the first and second annular stop lips 100 and 200. Under the action of this pressure, the first annular stop lip 100 and the second annular stop lipThe annular stopper lips 200 are bent in the axial direction such that the gap between the first annular stopper lip 100 and the second annular stopper lip 200 is defined by the gap S1Reduced to the gap S2The clearance is reduced, so that dirt such as cement is further prevented from entering the sealing device, and the sealing performance of the sealing device is further improved.
According to the sealing device provided by the embodiment of the invention, the framework 10 is fixed with the first annular stop lip 100 positioned on the outer side of the sealing lip, the radial part 202 of the dust-proof ring is fixed with the second annular stop lip 200 positioned on the outer side of the sealing lip, the dust-proof ring 20 and the framework 10 are coaxially arranged and form a containing cavity extending along the axial direction, because the first annular stop lip 100 and the second annular stop lip 200 both extend towards the direction far away from the sealing lip, when the sealing device is installed on a bearing, once dirt such as external cement, rainwater and the like enters the containing cavity, the dirt firstly falls into the outer surfaces of the first annular stop lip 100 and the second annular stop lip 200, when the bearing rotates, relative motion is generated between the framework 10 and the dust-proof ring 20, relative rotation is generated between the first annular stop lip 100 and the second annular stop lip 200, and one of the first annular stop lip 100 and the second annular stop lip 200 which rotates under the action of centrifugal force can enable the cement, the second stop lip 100 and the second lip 200, Dirt such as rainwater and the like is thrown out, so that the sealing performance of the sealing device is improved; on the other hand, because the first annular stop lip 100 and the second annular stop lip 200 are located on at least one same cross section, or the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 are located on at least one circumferential surface with the same radius, a labyrinth seal can be formed between the first annular stop lip 100 and the second annular stop lip 200, the flow rate of dirt such as cement rainwater flowing between the first annular stop lip 100 and the second annular stop lip 200 is reduced, the impact force on the sealing lip in the accommodating cavity is reduced, and the sealing performance of the sealing device is further improved.
As shown in fig. 3, in a specific embodiment, the inner diameter of the lip of the first annular stop lip 100 is equal to the inner diameter of the lip of the second annular stop lip 200, the outer diameter of the lip of the first annular stop lip 100 is equal to the outer diameter of the lip of the second annular stop lip 200, the lip thickness corresponding to the first annular stop lip 100 is equal to the lip thickness of the second annular stop lip 200, and the projections of the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 in the radial direction of the sealing device are completely overlapped. Therefore, the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 are respectively used as the side walls of the gap S, when dirt such as external cement rainwater flows into the gap along the inlet of the gap S (the opening above the gap in fig. 4), because the inner diameter of the lip of the first annular stop lip 100 is equal to the inner diameter of the lip of the second annular stop lip 200, and the outer diameter of the first annular stop lip 100 is equal to the outer diameter of the second annular stop lip 200, the first annular stop lip 100 and the second annular stop lip 200 can ensure that the distance between the inlet of the gap and the outlet of the gap (the opening below the gap in fig. 4) is longest on the basis of minimum material consumption, thereby being beneficial to reducing the flow speed of sewage and reducing the impact force of water flow on the seal lips.
With continued reference to FIG. 3, in one embodiment, in order to reduce material consumption and save cost, an included angle δ is formed between a straight line of the outer annular surface of the first annular stop lip 100 and an axis of the sealing device along a longitudinal section of the sealing device1May be equal to the angle delta between the axis and the line of the outer annular surface of the second annular stop lip 2002. Of course, in other embodiments, δ1And delta2Without limitation, delta1And delta2The angles may be different. It will be readily appreciated that to maintain hydrostatic pressure, the values of δ 1 and δ 2 may be less than 60 °, such as 30 °, 15 °, 10 °.
With continued reference to fig. 2, in a specific embodiment, the dust ring 20 further includes a dust ring axial portion 201, and the dust ring axial portion 201 and the dust ring radial portion 202 are fixedly connected;
the seal lip includes:
In a specific embodiment, the frame 10 further includes a frame axial portion 101, the frame axial portion 101 and the frame radial portion 102 are fixedly connected, and in order to facilitate the arrangement of the first annular stop lip 100, the first annular stop lip 100 is fixed to the frame radial portion 102. Of course, in another embodiment, the first annular stop lip 100 may also be disposed at the framework axial portion 101 or at the intersection of the framework axial portion 101 and the framework radial portion 102.
In one embodiment, as shown in fig. 2, to further improve the sealing performance of the sealing device, the sealing lip further comprises:
a third sealing lip 330, wherein the third sealing lip 330 is disposed on the inner side of the first sealing lip 310. The third sealing lip 330 is adapted to form a contact seal against the bearing inner race 40.
It should be noted that the outer side mentioned in the embodiment of the present invention refers to a side close to the outside, and similarly, the inner side mentioned in the embodiment of the present invention refers to a side close to the lubricant, and the sealing lip closest to the inner side serves as the last sealing barrier.
As shown in fig. 2, to solve the above problem, an embodiment of the present invention further provides a bearing, including: the bearing comprises a bearing inner ring 40, a bearing outer ring 50 and the sealing device, wherein the framework 10 is in interference fit with the bearing outer ring 50, and the dust-proof ring 20 is in interference fit with the bearing inner ring 40.
According to the bearing provided by the embodiment of the invention, the first annular stop lip 100 located on the outer side of the seal lip is fixed on the framework 10 of the sealing device, the second annular stop lip 200 located on the outer side of the seal lip is fixed on the radial part 202 of the dust ring of the sealing device, the dust ring 20 and the framework 10 are coaxially arranged and form the accommodating cavity extending along the axial direction, the first annular stop lip 100 and the second annular stop lip 200 extend towards the direction far away from the seal lip, once dirt such as external cement, rainwater and the like enters the accommodating cavity during operation of the bearing, the dirt can firstly fall into the outer surfaces of the first annular stop lip 100 and the second annular stop lip 200, when the bearing operates, relative motion is generated between the framework 10 and the dust ring 20, relative rotation is generated between the first annular stop lip 100 and the second annular stop lip 200, and one of the first annular stop lip 100 and the second annular stop lip 200 which rotates can be used for collecting the cement falling on the outer surface, Dirt such as rainwater is thrown out, so that the sealing performance of the bearing is improved; on the other hand, because the first annular stop lip 100 and the second annular stop lip 200 are located on at least one same cross section, or the lip of the first annular stop lip 100 and the lip of the second annular stop lip 200 are located on at least one circumferential surface with the same radius, a labyrinth seal can be formed between the first annular stop lip 100 and the second annular stop lip 200, the flow rate of dirt such as cement rainwater flowing between the first annular stop lip 100 and the second annular stop lip 200 is reduced, the impact force on the seal lip in the accommodating cavity is reduced, and the sealing performance of the bearing is further improved.
Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A seal assembly, comprising:
the framework is of an annular structure integrally and comprises a framework radial part, and a sealing lip is fixed on the framework radial part;
the dustproof ring is coaxially arranged with the framework and comprises a dustproof ring radial part, the dustproof ring radial part and the framework radial part are axially arranged at intervals, an accommodating cavity extending along the axial direction is defined by the dustproof ring and the framework, and the sealing lip and the dustproof ring form sealing;
the first annular stop lip is fixed on the framework, is positioned in the accommodating cavity and positioned on the outer side of the sealing lip, and extends in the direction far away from the sealing lip;
the second annular stop lip is fixed in the radial portion of dust ring, the second annular stop lip is located hold the intracavity, the second annular stop lip is to keeping away from the direction of seal lip extends, first annular stop lip with the second annular stop lip is located at least one same cross section, perhaps the lip of first annular stop lip with the lip of second annular stop lip is located at least one same radial periphery.
2. The seal of claim 1, wherein the lip of the first annular stop lip and the lip of the second annular stop lip are located on at least one circumferential surface of the same radius, the lip of the first annular stop lip and the lip of the second annular stop lip having a gap in the axial direction of the seal.
3. The seal of claim 2, wherein the lip of the first annular stop lip has an inner diameter equal to the inner diameter of the lip of the second annular stop lip, and the lip of the first annular stop lip has an outer diameter equal to the outer diameter of the lip of the second annular stop lip.
4. A sealing device according to claim 3, wherein the outer annular surface of the first annular stop lip is a conical annular surface.
5. A seal according to claim 3, wherein the outer annular surface of the second annular stop lip is a conical annular surface.
6. A sealing device according to any one of claims 1 to 5, characterized in that, in a longitudinal section of the sealing device, the angle between the line of the outer annular surface of the first annular stop lip and the axis of the sealing device is equal to the angle between the line of the outer annular surface of the second annular stop lip and the axis.
7. The seal of any one of claims 1-5, wherein said dust collar further comprises a dust collar axial portion, said dust collar axial portion and said dust collar radial portion being fixedly connected;
the seal lip includes:
first seal lip and second seal lip, the second seal lip is located the outside of first seal lip, the second annular backstop lip is located the outside of second seal lip, first seal lip butt in dust ring axial portion, the second seal lip butt in dust ring radial portion.
8. The sealing device of any one of claims 1-5, wherein the frame further comprises a frame axial portion fixedly connected to the frame radial portion, and the first annular stop lip is fixed to the frame radial portion.
9. The sealing device of claim 7, wherein the sealing lip further comprises:
a third sealing lip disposed on an inner side of the first sealing lip.
10. A bearing, comprising: bearing inner race, bearing outer race and sealing device according to any one of claims 1 to 9, said skeleton being in interference fit with said bearing outer race, said dust ring being in interference fit with said bearing inner race.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352767.6A CN111379789A (en) | 2020-04-29 | 2020-04-29 | Bearing and sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352767.6A CN111379789A (en) | 2020-04-29 | 2020-04-29 | Bearing and sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111379789A true CN111379789A (en) | 2020-07-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010352767.6A Pending CN111379789A (en) | 2020-04-29 | 2020-04-29 | Bearing and sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111379789A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022152319A1 (en) * | 2021-01-18 | 2022-07-21 | 舍弗勒技术股份两合公司 | Bearing and sealing device |
| WO2023029038A1 (en) * | 2021-09-06 | 2023-03-09 | 舍弗勒技术股份两合公司 | Seal structure for in-wheel electric motor drive system, and in-wheel electric motor drive system |
-
2020
- 2020-04-29 CN CN202010352767.6A patent/CN111379789A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022152319A1 (en) * | 2021-01-18 | 2022-07-21 | 舍弗勒技术股份两合公司 | Bearing and sealing device |
| WO2023029038A1 (en) * | 2021-09-06 | 2023-03-09 | 舍弗勒技术股份两合公司 | Seal structure for in-wheel electric motor drive system, and in-wheel electric motor drive system |
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Application publication date: 20200707 |