CN219866261U - Muddy water-proof oil seal suitable for high rotation speed - Google Patents
Muddy water-proof oil seal suitable for high rotation speed Download PDFInfo
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- CN219866261U CN219866261U CN202321031430.0U CN202321031430U CN219866261U CN 219866261 U CN219866261 U CN 219866261U CN 202321031430 U CN202321031430 U CN 202321031430U CN 219866261 U CN219866261 U CN 219866261U
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- oil seal
- lip
- ring
- seal
- muddy water
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- 238000007789 sealing Methods 0.000 claims abstract description 81
- 239000002184 metal Substances 0.000 claims abstract description 63
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 18
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 18
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 18
- 238000004073 vulcanization Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 230000003405 preventing effect Effects 0.000 claims description 14
- 230000000694 effects Effects 0.000 abstract description 4
- 229920001971 elastomer Polymers 0.000 description 16
- 229920000459 Nitrile rubber Polymers 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Sealing With Elastic Sealing Lips (AREA)
Abstract
The utility model relates to the technical field of oil seals, in particular to a muddy water-proof oil seal suitable for high rotation speed, which comprises an annular outer oil seal, an inner oil seal and a metal sealing ring, wherein the outer oil seal comprises an outer framework and an outer sealing body which are integrated by vulcanization, and the inner oil seal comprises an inner framework and an inner sealing body which are integrated by vulcanization; the inner side of the outer sealing body is provided with a main lip, a first auxiliary lip and a limiting step, the limiting step extends downwards, the lower end of the limiting step is provided with a wear-resistant ring, and the wear-resistant ring is made of polytetrafluoroethylene; the lower extreme of inner seal body is equipped with the second and sets up the lip, the second sets up lip downwardly extending and with metal seal ring interference fit, the second sets up the lip and is (0.3 + -0.1) mm with metal seal ring's interference. According to the utility model, the wear-resistant ring is arranged at the lower end of the limiting step, and the interference of the second auxiliary lip and the metal sealing ring is accurately designed, so that the high temperature generated by friction of the muddy water-proof oil seal under a high-speed working condition can be reduced, and the sealing effect is improved.
Description
Technical Field
The utility model relates to the technical field of oil seals, in particular to a muddy water-proof oil seal suitable for high rotation speed.
Background
Oil seals at sealing parts such as an agricultural mechanical axle and a transfer case are easy to be affected by dust, muddy water, weeds and the like in the operation process, and silt enters the lip of the oil seal to easily cause abrasion and oil leakage of the oil seal.
At present, a plurality of common TC oil seals are adopted to form a plurality of seals, the muddy water oil seals probably have a certain effect in dry fields in the north, but in paddy fields in the south, a large amount of muddy sand, weeds or other hard particles exist in the use scene, and the common rubber sealing lips are difficult to play a role in blocking, so that the situation that weeds are wound and then the rubber lips are pulled out cannot be avoided.
Another type of muddy water-proof oil seal currently adopts a labyrinth type oil seal (also called a box type oil seal). CN218718775U discloses a box type oil seal with an assembly limit step, which comprises an outer oil seal, an inner oil seal and a metal sealing ring which are all lantern rings; the section of the outer oil seal is two L-shaped sections which are long and short and the top ends of the two L-shaped sections are connected, and the section of the inner oil seal is also L-shaped; the left side of the outer oil seal is bent to form an assembly limiting step, and the right side of the outer oil seal is bent to be opposite to the inner oil seal and keeps a distance; the right side bending bottom surface of the outer oil seal abuts against the top end of the metal sealing ring, the side surface of the metal sealing ring is tightly attached to the outer oil seal, the bending part of the inner oil seal is positioned between the metal sealing ring and the outer oil seal, and a channel is formed by keeping a distance; the sealing layers are wrapped outside the outer oil seal and the inner oil seal; the sealing layer is provided with a first dustproof lip at a passage opening between the outer oil seal and the inner oil seal, and a limiting boss is arranged in the passage; a second dustproof lip is arranged in the channel between the inner oil seal and the metal sealing ring, and a third dustproof lip is arranged at the channel opening. The box-type oil seal forms a labyrinth-shaped channel through the metal sealing rings and the plurality of dustproof lips, can effectively block external muddy water and sand and stones, and prolongs the service life of the oil seal. However, this cassette oil seal has the following disadvantages: (1) The interference between the second dustproof lip and the metal sealing ring is generally 0.5-1 mm, the interference is large, when the second dustproof lip meets a high-rotation-speed working condition (the linear speed is more than 2.5 m/s), the temperature rise is fast due to friction heating, and high temperature is generated at a friction part, so that the rubber of the second sealing lip is aged, and the sealing performance is lost. (2) The labyrinth oil seal can be unavoidable when the installation leads to inside and outside oil seal axial to squeeze out, and although this box-type oil seal has set up spacing boss in the passageway between outside oil seal and the inside oil seal, this spacing boss adopts rubber to make, and its hardness is Shore A75, and hardness is lower, and extrusion deformation volume is up to 30% when the assembly, can not effectively spacing, leads to high rotational speed limit step can rub heat ageing seriously, and rubber embrittlement is cracked, in case the piece gets into lip position, can destroy main lip seal and lead to the oil leak. (3) The larger interference between the second dustproof lip and the metal sealing ring and the larger friction between the limiting boss made of rubber and the inner sealing metal framework can cause the torque value of the box-type oil seal to be overlarge, so that the kinetic energy of the agricultural machinery is consumed, and the energy conservation and emission reduction are not facilitated. (4) The metal sealing ring is tightly attached to the outer oil seal through interference fit, so that the metal sealing ring is at risk of falling off.
Disclosure of Invention
The utility model aims to provide a muddy water preventing oil seal suitable for high rotating speed, which can reduce high temperature generated by friction of the muddy water preventing oil seal under a high-speed working condition and improve sealing effect by arranging a wear-resisting ring at the lower end of a limiting step and precisely designing the interference of a second auxiliary lip and a metal sealing ring.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a prevent muddy water oil blanket suitable for high rotational speed, includes annular outer oil blanket, interior oil blanket and metal seal ring, outer oil blanket includes that the vulcanization becomes integrative exoskeleton and outer seal body, interior oil blanket includes that the vulcanization becomes integrative inner skeleton and inner seal body, interior oil blanket and metal seal ring all overlap the inside of establishing at outer oil blanket, interior oil blanket can rotate for outer oil blanket, metal seal ring and exoskeleton fixed connection; the inner side of the outer sealing body is provided with a main lip, a first auxiliary lip and a limiting step, the main lip and the first auxiliary lip extend inwards and are in interference fit with the inner framework, the outer side of the main lip is provided with a holding spring, the limiting step extends downwards, the lower end of the limiting step is provided with a wear-resistant ring, and the wear-resistant ring is made of polytetrafluoroethylene; the lower extreme of inner seal body is equipped with the second and sets up the lip, the second sets up lip downwardly extending and with metal seal ring interference fit, the second sets up the lip and is (0.3 + -0.1) mm with metal seal ring's interference.
Compared with the prior art, the muddy water-proof oil seal suitable for the high rotating speed has the beneficial effects that: (1) The interference of the second auxiliary lip and the metal sealing ring is (0.3+/-0.1) mm, and friction heat generation between the second auxiliary lip and the metal sealing ring can be obviously reduced under the working condition of high rotation speed (linear speed is more than 2.5 m/s), so that the second auxiliary lip rubber is prevented from aging, and the sealing effect is ensured. (2) The lower end of the limiting step is provided with a polytetrafluoroethylene wear-resistant ring, the friction coefficient of the polytetrafluoroethylene material is 0.045-0.08, and the friction coefficient of the nitrile rubber is 1.5, so that compared with the limiting step made of rubber, the polytetrafluoroethylene wear-resistant ring can effectively reduce the friction with the metal sealing ring, and therefore the high temperature of a high-rotation-speed working condition is reduced; the highest use temperature of the nitrile rubber is 130 ℃, and the highest use temperature of the polytetrafluoroethylene can reach 250 ℃, so that the wear-resistant ring has better high temperature resistance, and can effectively avoid aging caused by high temperature; the hardness of polytetrafluoroethylene is Shore D60, the hardness of nitrile rubber is Shore A75, and the contrast phase difference is 20 Shore A, so that the limit capability of the wear-resistant ring made of polytetrafluoroethylene is more excellent. (3) The interference of the second auxiliary lip and the metal sealing ring is designed to be (0.3+/-0.1) mm, and the lower end of the limiting step is provided with the wear-resistant ring made of polytetrafluoroethylene, so that the torque value of the oil seal can be reduced, and the kinetic energy consumption of the agricultural machinery is reduced.
Further, the interference of the second auxiliary lip and the metal sealing ring is 0.3mm.
Further, the lower end of the wear-resistant ring extends downwards by 0.2-0.5 mm from the lower end face of the limiting step.
Further, a nest edge is arranged at the lower end of the outer framework, and the outer edge of the metal sealing ring is embedded in the nest edge. By adopting the technical scheme, the metal sealing ring can be prevented from falling off.
Further, the inner end of the outer framework extends downwards to the inside of the limit step. By adopting the technical scheme, the outer framework can play a supporting role on the limiting step, so that the axial deformation of the limiting step in the assembly of the oil seal is reduced, and the friction force between the wear-resistant ring and the metal sealing ring and the torsion force of the oil seal are further reduced.
Further, the inner end of the metal sealing ring is bent upwards, a third auxiliary lip is arranged at the lower end of the inner sealing body, and the third auxiliary lip is inclined outwards and in interference fit with the inner end of the metal sealing ring. The third auxiliary lip is matched with the inner end of the metal sealing ring, so that the muddy water and weed preventing effect of the oil seal is improved.
Further, two second auxiliary lips are arranged.
Drawings
Fig. 1 is a schematic structural diagram of a muddy water preventing oil seal suitable for high rotation speed in embodiment 1.
Wherein: the novel sealing ring comprises a 1-metal sealing ring, a 2-outer framework, a 3-outer sealing body, a 4-inner framework, a 5-inner sealing body, a 6-main lip, a 7-first auxiliary lip, an 8-limiting step, a 9-holding spring, 10, a second auxiliary lip, 11, a wear-resistant ring, 12, a nest edge and 13-third auxiliary lip.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
example 1
Fig. 1 shows an embodiment 1 of the present utility model, in which a muddy water preventing oil seal adapted for high rotation speed is installed between rotary parts, such as a shaft and a shaft seat, to isolate a lubricating medium from the external environment, and a sealing medium side (above the oil seal shown in fig. 1) and an atmosphere side (below the oil seal shown in fig. 1) are formed on both sides of the muddy water preventing oil seal.
In this embodiment, unless otherwise specified, "outer" refers to the radially outer side of the oil seal, such as "outer oil seal"; "inner" refers to the radially inner side of an oil seal, such as an "inner oil seal".
As shown in fig. 1, a muddy water-proof oil seal suitable for high rotation speed comprises an annular outer oil seal, an inner oil seal and a metal sealing ring 1.
The outer oil seal comprises an outer framework 2 and an outer sealing body 3 which are integrated by vulcanization, and the inner oil seal comprises an inner framework 4 and an inner sealing body 5 which are integrated by vulcanization. The material of the outer seal 3 and the inner seal 5 is rubber, and a rubber type such as FPM, ACM, NBR is selected, and in this embodiment, NBR is preferable.
The inner oil seal and the metal sealing ring 1 are both sleeved in the outer oil seal, and the inner oil seal can rotate relative to the outer oil seal.
The metal sealing ring 1 is fixedly connected with the outer framework 2, specifically, a nest edge 12 is arranged at the lower end of the outer framework 2, and the outer edge of the metal sealing ring 1 is embedded in the nest edge 12, so that the metal sealing ring 1 can be prevented from falling off.
The inner side of the outer sealing body 3 is provided with a main lip 6, a first auxiliary lip 7 and a limiting step 8. The main lip 6 and the first auxiliary lip 7 extend inwards and are in interference fit with the inner framework 4, and a holding spring 9 is arranged on the outer side of the main lip 6. The limiting step 8 extends downwards, the inner end of the outer framework 2 extends downwards to the inside of the limiting step 8 so as to play a supporting role on the limiting step 8, reduce the axial deformation of the limiting step 8 in oil seal assembly and further reduce the friction force between the wear-resistant ring and the metal sealing ring and the torsion force of the oil seal. The lower extreme of spacing step 8 is equipped with wear-resisting ring 11, the material of wear-resisting ring 11 is polytetrafluoroethylene, the lower extreme of wear-resisting ring 11 is by the lower terminal surface downwardly extending 0.3mm of spacing step 8.
The lower end of the inner sealing body 5 is provided with a second auxiliary lip 10 and a third auxiliary lip 13. Two second auxiliary lips 10 are arranged along the radial direction of the inner sealing body 5, the second auxiliary lips 10 extend downwards and are in interference fit with the metal sealing ring 1, and the interference of the second auxiliary lips 10 and the metal sealing ring 11 is 0.3mm. By providing two to the second auxiliary lip 10 in redundant arrangement, the muddy water and dust preventing effect of the oil seal can be improved. The inner end of the metal sealing ring 1 is bent upwards, a third auxiliary lip 13 is arranged at the lower end of the inner sealing body 5, and the third auxiliary lip 13 is inclined outwards and in interference fit with the inner end of the metal sealing ring 1. The third auxiliary lip 13 is matched with the inner end of the metal sealing ring 1 to form a reverse bevel angle, when the inner oil seal rotates along with the shaft, the contacted foreign matters are thrown out by utilizing the centrifugal force during high-speed rotation, and the muddy water preventing, weed winding preventing and hard particle invasion preventing effects can be remarkably improved.
During installation, the muddy water-proof oil seal is integrally pressed into the shell from bottom to top, and the outer circular surface of the outer sealing body 3 and the shell form static seal. Then the shaft is pressed into the inner oil seal from bottom to top, and the shaft drives the inner oil seal to move from bottom to top in the process because of the interference of 0.3 mm-0.5 mm between the shaft and the inner sealing body 5, so that the inner framework 4 and the wear-resistant ring 11 are extruded. In the working process, the inner oil seal rotates along with the shaft, a dynamic seal is formed between the outer oil seal and the inner oil seal, the main lip 6 is used for preventing sealing medium from leaking, the first auxiliary lip 7, the second auxiliary lip 10 and the third auxiliary lip 13 form a plurality of labyrinth sealing channels, and muddy water, particles, weeds and the like on the atmosphere side are prevented from entering the medium sealing side.
According to research, the interference between the second auxiliary lip 10 and the metal sealing ring 1 in the conventional labyrinth muddy water-proof oil seal is too large (0.5-1 mm), so that the friction force is increased, and the labyrinth muddy water-proof oil seal is not suitable for the high-rotation-speed working condition that the linear speed is more than 2.5 m/s. In this embodiment, the interference between the second auxiliary lip 10 and the metal seal ring 1 is 0.3mm, and friction heat generation between the second auxiliary lip 10 and the metal seal ring 1 can be significantly reduced under a high-rotation-speed working condition, so that the second auxiliary lip 10 is prevented from being aged, and the interference of 0.3mm is enough to ensure the sealing performance between the second auxiliary lip and the metal seal ring. In the embodiment, the lower end of the limiting step 8 is provided with the polytetrafluoroethylene wear-resistant ring 11, the polytetrafluoroethylene friction coefficient is 0.045-0.08, and the nitrile rubber friction coefficient is 1.5, so that compared with the rubber limiting step, the polytetrafluoroethylene wear-resistant ring 11 can effectively reduce the friction with the metal sealing ring 1, thereby reducing the high temperature under the working condition of high rotation speed; the highest use temperature of the nitrile rubber is 130 ℃, and the highest use temperature of the polytetrafluoroethylene can reach 250 ℃, so that the wear-resistant ring 11 has better high temperature resistance, and can effectively avoid aging caused by high temperature; the hardness of polytetrafluoroethylene is Shore D60, the hardness of nitrile rubber is Shore A75, and the contrast phase difference is 20 Shore A, so that the limit capability of the wear-resistant ring 11 made of polytetrafluoroethylene is more excellent. According to the embodiment, the interference between the second auxiliary lip 10 and the metal sealing ring 1 is designed to be 0.3mm, and the lower end of the limiting step 8 is provided with the wear-resistant ring 11 made of polytetrafluoroethylene, so that the torque value of the oil seal can be reduced, and the kinetic energy consumption of the agricultural machinery is reduced.
Through the running test of the rotating speed of 3.9m/s and 240 hours, the muddy water preventing oil seal suitable for the high rotating speed in the embodiment has no oil leakage and muddy water leakage condition in the test process, and the second auxiliary lip 10 has no abrasion and rubber carbonized powder.
Example 2
Unlike embodiment 1, the interference of the second sub-lip 10 with the metal seal ring 1 in this embodiment is 0.2mm.
Through the running test of 2.5m/s rotating speed and 240 hours, the muddy water oil seal suitable for high rotating speed in the embodiment has no oil leakage and muddy water leakage condition in the test process, and the second auxiliary lip 10 has no abrasion and rubber carbonized powder.
Example 3
Unlike embodiment 1, the interference of the second sub-lip 10 with the metal seal ring 1 in this embodiment is 0.4mm.
Through the running test of 2.5m/s rotating speed and 240 hours, the muddy water oil seal suitable for high rotating speed in the embodiment has no oil leakage and muddy water leakage condition in the test process, and the second auxiliary lip 10 has no abrasion and rubber carbonized powder.
Comparative example 1
Unlike example 1, the interference of the second sub-lip 10 with the metal seal ring 1 in comparative example 1 was 0.7mm.
When a running machine test with the rotating speed of 2.5m/s is carried out, the smoking phenomenon occurs within 2min, and the sealing of the product fails along with peculiar smell generated by excessive friction of rubber.
Comparative example 2
The difference from example 1 is that the interference of the second auxiliary lip 10 with the metal seal ring 1 in comparative example 2 is 0.5mm.
Through a running test at a rotating speed of 2.5m/s for 240 hours, the second auxiliary lip 10 is seriously worn and generates rubber carbonized powder although oil leakage is avoided.
The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the present utility model.
Claims (7)
1. The utility model provides a prevent muddy water oil blanket suitable for high rotational speed, includes annular outer oil blanket, interior oil blanket and metal seal ring (1), outer oil blanket includes that the vulcanization is outer skeleton (2) and outer seal body (3) as an organic whole, interior oil blanket includes that the vulcanization is inner skeleton (4) and inner seal body (5) as an organic whole, interior oil blanket and metal seal ring (1) all overlap the inside of establishing at outer oil blanket, interior oil blanket can rotate for outer oil blanket, metal seal ring (1) and outer skeleton (2) fixed connection; the inner side of the outer sealing body (3) is provided with a main lip (6), a first auxiliary lip (7) and a limiting step (8), the main lip (6) and the first auxiliary lip (7) extend inwards and are in interference fit with the inner framework (4), the outer side of the main lip (6) is provided with a holding spring (9), and the limiting step (8) extends downwards; the lower end of the inner sealing body (5) is provided with a second auxiliary lip (10), and the second auxiliary lip (10) extends downwards and is in interference fit with the metal sealing ring (1), and the inner sealing body is characterized in that the lower end of the limiting step (8) is provided with a wear-resistant ring (11), and the wear-resistant ring (11) is made of polytetrafluoroethylene; the interference of the second auxiliary lip (10) and the metal sealing ring (1) is (0.3+/-0.1) mm.
2. A muddy water-proof oil seal suitable for high rotational speeds according to claim 1, characterized in that the interference of the second auxiliary lip (10) with the metal sealing ring (1) is 0.3mm.
3. The muddy water-proof oil seal suitable for high rotation speed according to claim 1, characterized in that the lower end of the wear-resistant ring (11) extends downwards by 0.2-0.5 mm from the lower end face of the limit step (8).
4. The muddy water-proof oil seal suitable for high rotation speed according to claim 1, wherein the lower end of the outer framework (2) is provided with a nest edge (12), and the outer edge of the metal sealing ring (1) is embedded in the nest edge (12).
5. A muddy water-proof oil seal adapted for high rotational speeds according to claim 1, characterized in that the inner end of the outer skeleton (2) extends downwardly into the interior of the limit step (8).
6. A muddy water preventing oil seal suitable for high rotation speed according to any one of claims 1 to 5, characterized in that the inner end of the metal sealing ring (1) is bent upwards, the lower end of the inner sealing body (5) is provided with a third auxiliary lip (13), and the third auxiliary lip (13) is inclined outwards and in interference fit with the inner end of the metal sealing ring (1).
7. A muddy water preventing oil seal adapted for high rotation speed according to any one of claims 1 to 5, characterized in that said second auxiliary lip (10) is provided with two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321031430.0U CN219866261U (en) | 2023-04-28 | 2023-04-28 | Muddy water-proof oil seal suitable for high rotation speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321031430.0U CN219866261U (en) | 2023-04-28 | 2023-04-28 | Muddy water-proof oil seal suitable for high rotation speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219866261U true CN219866261U (en) | 2023-10-20 |
Family
ID=88344973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321031430.0U Active CN219866261U (en) | 2023-04-28 | 2023-04-28 | Muddy water-proof oil seal suitable for high rotation speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219866261U (en) |
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2023
- 2023-04-28 CN CN202321031430.0U patent/CN219866261U/en active Active
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