CN115451124A - A stack combination seal structure for oil medium - Google Patents
A stack combination seal structure for oil medium Download PDFInfo
- Publication number
- CN115451124A CN115451124A CN202211017744.5A CN202211017744A CN115451124A CN 115451124 A CN115451124 A CN 115451124A CN 202211017744 A CN202211017744 A CN 202211017744A CN 115451124 A CN115451124 A CN 115451124A
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- China
- Prior art keywords
- sealing ring
- shaped rubber
- sealing
- ptfe
- sealing element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
The invention relates to a superposed combined sealing structure for an oil medium, wherein a PTFE sealing element is positioned on the outer circumference of an O-shaped rubber sealing ring, and the PTFE sealing element and the O-shaped rubber sealing ring form an interference fit assembly with a cylinder body and a piston. The O-shaped rubber sealing ring is superposed with the structural seal of the PTFE sealing element in the piston groove, and the O-shaped rubber sealing ring and the PTFE sealing element are combined by means of the material elasticity and the special characteristics of high temperature resistance, low temperature resistance, corrosion resistance, high lubrication (minimum friction coefficient), non-stickiness and the like of the O-shaped rubber sealing ring, so that the problem of the use reliability of the sealing ring is solved, and the swelling phenomenon of the sealing ring caused by long-term immersion in different gear oil media is overcome; the phenomena that the sealing function is changed and the sealing leakage is generated due to the corresponding change of rubber hardness, size, volume change, material and the like of the O-shaped sealing ring at different temperatures are overcome; the problem of sealing failure of the sealing ring is solved, and the service life is prolonged.
Description
Technical Field
The invention belongs to a sealing structure, and relates to a superposed combined sealing structure for an oil medium, in particular to a superposed combined sealing structure for an automatic gearbox with a heavy truck gear.
Background
For many years, people are always studying how to prolong the relationship between the reasonable installation structure and the service life of the gear automatic gearbox sealing ring. The O-ring type and groove size configuration is specified in GB3452.2-1988 (see FIG. 1).
Because the O-shaped rubber sealing ring in the gearbox sealing ring is in different environments in the using process, the sealing state of the O-shaped rubber sealing ring can be changed. But the sealing ring is soaked in different gear oil media for a long time, so that the sealing ring has a swelling phenomenon; at different temperatures, rubber hardness, size, volume change, material and the like of the O-shaped sealing ring correspondingly change, so that the sealing function changes, the sealing leakage phenomenon is generated, the serious consequence of the sealing failure of the O-shaped sealing ring is caused, and great risk exists in the service life of the O-shaped sealing ring. Whether the O-shaped sealing ring is used reliably and reasonably has great influence on an automatic transmission system.
Although the value of the O-shaped sealing ring is only 2-3 yuan, the value is very low, if the O-shaped sealing ring is damaged, the transmission system cannot normally operate, even abnormal abrasion of parts in the transmission is influenced, the whole transmission is damaged and scrapped, and 3000-5000 yuan loss is caused, so that the function of the O-shaped sealing ring is very critical, and the critical part with serious loss is caused by small loss.
In order to solve the sealing problem, the existing structure needs to be improved.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a superposed combined sealing structure for an oil medium, which well solves the problem and prolongs the service life of a sealing ring of an automatic transmission, namely the service life of a transmission system is ensured.
Technical scheme
A is used for the overlapping combined seal structure of the oil medium, including the O-shaped rubber seal 5; characterized by further comprising a PTFE seal 4; the PTFE sealing element 4 is positioned on the outer circumference of the O-shaped rubber sealing ring 5, and the PTFE sealing element 4 and the O-shaped rubber sealing ring 5 form interference fit with the cylinder body 1.
The cross section of the PTFE sealing element 4 is of an opposite structure and is positioned at the end part side of oil, one side of the cylinder body 1 is of an arc structure and is positioned at the end part side of air, the contact side of the cylinder body 1 is of a slope step structure, an air flow storage gap h is reserved, and the maximum size part of the bottom plane is matched with the diameter part of the O-shaped rubber sealing ring 5.
Advantageous effects
The invention provides a superposed combined sealing structure for an oil medium, wherein a PTFE sealing element is positioned on the outer circumference of an O-shaped rubber sealing ring, and the PTFE sealing element and the O-shaped rubber sealing ring form an interference fit assembly with a cylinder body 1 and a piston 3. The structure of the PTFE sealing element is arranged on the O-shaped rubber sealing ring in a superposed mode in the piston groove, and the O-shaped rubber sealing ring and the PTFE sealing element are combined by means of the elastic performance of the O-shaped rubber sealing ring and the special characteristics of high temperature resistance, low temperature resistance, corrosion resistance, high lubrication (minimum friction coefficient), non-adhesiveness and the like of the PTFE sealing element, so that the problem of the use reliability of the sealing ring is solved. Particularly, for the installation and use in the automatic gearbox with heavy truck gears, the swelling phenomenon of the sealing ring caused by long-term immersion in different gear oil media is overcome; the phenomena that the sealing function is changed and the sealing leakage is generated due to the corresponding change of rubber hardness, size, volume change, material and the like of the O-shaped sealing ring at different temperatures are overcome; the problem of sealing failure of the sealing ring is solved, and the service life is prolonged.
Drawings
FIG. 1: prior art seal arrangements for oil media;
sequence 1-cylinder sequence 2-O-shaped rubber sealing ring sequence 3-piston
FIG. 2: the invention relates to a superposed combined sealing structure for oil medium
Sequence 1-cylinder sequence 3-piston sequence 4-PTFE sealing element sequence 5-O type rubber sealing ring
FIG. 3: cross-sectional anisotropic structure of PTFE seal 4 and cross-sectional anisotropic structure of example
FIG. 4: examples of the invention
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the invention relates to a superposed combined sealing structure for an oil medium, which is used for being installed in an automatic gearbox with a heavy truck gear. Comprises an O-shaped rubber sealing ring 5 and a PTFE sealing element 4; the PTFE sealing element 4 is positioned on the outer circumference of the O-shaped rubber sealing ring 5, and the PTFE sealing element 4 and the O-shaped rubber sealing ring 5 form interference fit with the cylinder body 1.
The section of the PTFE sealing element 4 is of an anisotropic structure, is positioned at the end part side of oil, is of an arc structure at one side of the cylinder body 1, is positioned at the end part side of air, is of a slope step structure at the contact side of the cylinder body 1, an air flow storage gap h is reserved, and the maximum size part of the bottom plane is matched with the diameter part of the O-shaped rubber sealing ring 5.
The radian of the circular arc structure is 3 degrees.
The gap h is a slope of 108 degrees, the height is 2.62-1.8=0.82mm, and the width is 2mm.
The interference fit between the PTFE sealing element 4 and the O-shaped rubber sealing ring 5 and the cylinder body 1 is 1.04.
Firstly, sleeving an O-shaped rubber sealing ring sequence 5 in a groove 3 of a piston sequence, and then installing a PTFE sealing element sequence 4 above the O-shaped rubber sealing ring sequence 5; and (3) the combined piece is arranged in the inner hole of the cylinder body sequence 1 to complete the cylinder assembly.
Because the piston 3 during operation, one side thrust is the oil pressure, and one side thrust is atmospheric pressure, according to the atress characteristics, the process assembly nature is considered in the cross-section of PTFE sealing member 4, designs to the opposite sex structure, is located the tip of oil pressure one side, is the circular arc structure on the one side of cylinder body 1 contact, is located the tip of air one side, is slope stair structure on the cylinder body 1 contact one side, leaves air current storage clearance h, and the bottom plane maximum dimension position is pressed (coincide) on (with) O type rubber seal 5 diameter position. A flat plate is placed on the analogous ball.
Claims (5)
1. A superposition combined sealing structure for oil medium comprises an O-shaped rubber sealing ring (5); characterized in that it further comprises a PTFE seal (4); the PTFE sealing element (4) is located on the outer circumference of the O-shaped rubber sealing ring (5), and the PTFE sealing element (4) and the O-shaped rubber sealing ring (5) form interference fit with the cylinder body (1).
2. The stacked composite seal structure for an oil medium according to claim 1, characterized in that: the cross section of the PTFE sealing element 4 is of an opposite structure and is positioned at the end part side of oil, one side of the cylinder body 1 is of an arc structure and is positioned at the end part side of air, the contact side of the cylinder body 1 is of a slope step structure, an air flow storage gap h is reserved, and the maximum size part of the bottom plane is matched with the diameter part of the O-shaped rubber sealing ring 5.
3. A superimposed composite seal structure for oil media according to claim 1, characterized in that: the radian of the arc structure is 3 degrees.
4. The stacked composite seal structure for an oil medium according to claim 1, characterized in that: the gap h is a slope of 108 °, 2.62-1.8=0.82mm in height and 2mm in width.
5. The stacked composite seal structure for an oil medium according to claim 1, characterized in that: the interference fit between the PTFE sealing element (4) and the O-shaped rubber sealing ring (5) and the cylinder body (1) is 1.04.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017744.5A CN115451124A (en) | 2022-08-24 | 2022-08-24 | A stack combination seal structure for oil medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017744.5A CN115451124A (en) | 2022-08-24 | 2022-08-24 | A stack combination seal structure for oil medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115451124A true CN115451124A (en) | 2022-12-09 |
Family
ID=84297957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211017744.5A Pending CN115451124A (en) | 2022-08-24 | 2022-08-24 | A stack combination seal structure for oil medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115451124A (en) |
-
2022
- 2022-08-24 CN CN202211017744.5A patent/CN115451124A/en active Pending
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