Oil seal is the customary name of general seals, simply put, it is the sealing of lubricating oil. It is a mechanical element used to seal grease (oil is the most common liquid substance in the transmission system, and also refers to the meaning of general liquid substance), which isolates the parts that need to be lubricated from the output parts of the transmission parts, so as not to let the lubricating oil leak. Seals for static seals and dynamic seals (generally reciprocating motion) are called oil seals.
The main function of oil seals is to prevent the leakage of lubricants and other liquids, while preventing external impurities and dust from entering the inside of the machine. It is an indispensable part of mechanical equipment, and its performance and quality directly affect the service life and performance of mechanical equipment. Oil seals also prevent the loss of lubricants and other fluids, reducing equipment maintenance and replacement costs.
Oil seals have a wide range of applications in many fields. In the field of industrial equipment, oil seals are commonly used in equipment such as hydraulic cylinders, pumps, compressors, gearboxes, etc., to ensure their proper operation and prevent leakage. In the automotive industry, oil seals are widely used in engines, transmission systems, suspension systems, etc. In addition, oil seals are also commonly used in aerospace equipment, agricultural machinery, paper machinery and other fields
Classify
Oil seals are generally divided into monomer type and assembly type, and the assembly type is that the skeleton and lip material can be freely combined, and are generally used for special oil seals.
From the sealing effect, characteristics, structure type, working state and sealing mechanism of oil seal, it can be divided into a variety of forms and different names, but it is customary to call the rotary shaft lip seal as oil seal, and the seal with static seal and dynamic seal (general reciprocating motion) is called seal.
The representative form of the oil seal is TC oil seal, which is a double-lip oil seal with a self-tightening spring completely covered by rubber.
In addition, it can be classified according to different classification criteria. Here are some common ways to categorize:
Depending on the application location
Radial Shaft Seals: Used to prevent fluid leakage on rotating shafts, they typically consist of lip rings and springs.
Piston Seals: Used to prevent fluid leakage between the piston and the piston cylinder, typically with ring seals or double-acting seals.
According to the type of structure
Lip Seals: Lip Seals have one or more lip rings that form a seal by contact with a rotating shaft or fixed component.
Face Seals: Consist of two metal covers in flat contact for high-pressure and high-temperature applications.
O-Rings: Annular seals with a circular cross-section, typically installed in a slot, to provide a static or dynamic seal.
According to the working principle
Static Seals: Used to seal between stationary parts, such as flange seals, gaskets, etc.
Dynamic Seals: Used to seal between moving parts, such as shaft seals and piston seals.
According to the material
Rubber oil seals: made of rubber or elastic materials, such as nitrile rubber (NBR), fluoroelastomer (FKM), etc.
Polyurethane oil seals: Made of polyurethane material, it has high abrasion and oil resistance.
Polytetrafluoroethylene (PTFE) oil seals: Made of PTFE material, it has good resistance to high temperature and chemical corrosion.
These are common ways to classify oil seals, but there may be more subdivisions and special types of oil seals in practical applications. It is important to select the appropriate type of oil seal based on the specific application needs and operating conditions, and ensure that it is properly installed and maintained to ensure proper operation and sealing of the equipment.
There are many types of oil seals, including shaft seals, piston seals, rotary plugging rings, etc. Shaft seals are the most common type of oil seals and are widely used in sealing various rotating shafts. Piston seals are mainly used to seal cylinder pistons to prevent liquid or gas leakage. Rotary plugging ring is a special oil seal used to prevent leakage in rotating machinery, and is commonly used in pumps, fans, and other equipment.
Material
The commonly used materials for oil seals are: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, PTFE, etc.
Nitrile rubber (NBR)
It has good heat resistance, wear resistance, resistance to various lubricating oils, greases, oil-gas mixtures, etc., applicable temperature -30~120 degrees Celsius, but can no longer be used in phosphate ester hydraulic oil and gear oil containing extreme pressure additives, and has stable performance in gasoline and low aniline point mineral oil.
Polyacrylate rubber (ACM)
Superior oil resistance, heat resistance, wear resistance, ozone resistance, ultraviolet radiation resistance, especially resistant to lubricating oil, gear oil, motor oil, engine oil, petroleum-based hydraulic oil containing extreme pressure agent, etc., suitable for working in the range of -30~150 degrees Celsius.
Fluoroelastomer (FPM)
Aging resistance, heat resistance, oil resistance, suitable for almost all lubricating oil, fuel oil, gasoline, not easy to harden in oil containing extreme pressure additives, but cold resistance, high temperature wear resistance is poor, permanent compression deformation is large, suitable for temperature -20 ~ 250 degrees Celsius.
Silastic
It has outstanding resistance to high and low temperatures, and can be used for a long time at 150 degrees Celsius without performance changes; It can be used continuously for 10000h at 200 times, and can maintain its unique flexibility and ozone resistance, weather resistance and other advantages in the working temperature range of -70~260.
Polytetrafluoroethylene
It has outstanding chemical stability, thermal stability, friction reduction and self-lubrication, and its cracking temperature is above 400. Therefore, it is able to work normally in the temperature range of -200~300 degrees Celsius. In addition to free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides and acids.
Nitrile rubber and fluorine rubber materials are widely used oil seals, the former is low cost, but the temperature resistance and sealing have been significantly improved, but the cost is high, and still has some bad commonalities of ordinary rubber materials, such as poor wear resistance, short service life, particularly sensitive to the eccentric reaction of the shaft, etc., leakage phenomenon is still relatively common. PTFE oil seal is a high-tech product, which is the direction of the future development of oil seal.
When selecting the material of the oil seal, the compatibility of the material to the working medium, the adaptability to the operating temperature range, and the ability of the lip to follow the rotation shaft at high speed must be considered. 2. Generally, the temperature of the lip of the oil seal is 20~50 °C higher than the temperature of the working medium, and attention should be paid to the selection of oil seal materials. 3. The working range of the oil seal is related to the material used in the oil seal: -40~120 °C when the material is nitrile butadiene rubber (NBR), -30~180 °C when the material is Nitrile (NBR), -30~180 °C, and -25~300 °C when the material is fluorine rubber (FPM).
Functional use
Engine: crankshaft – crankshaft front and rear oil seals valve – valve oil seals (engine repair kit O-rings) (distributor oil seals, water pump oil seals, balance shaft oil seals, oil pump oil seals…); Camshaft – camshaft oil seal; Transmission: Transmission – transmission front and rear oil seals, shift lever oil seals (transmission repair kit O-rings) (transfer case – transfer case front and rear oil seals); Rear axle: Half shaft – rear half shaft oil seal Differential – (front) rear angle vector oil seal Rear wheel oil seal Front wheel oil seal Direction engine oil seal (direction machine repair kit O-ring) Direction booster oil seal (front half shaft oil seal).
All parts that have liquid lubricating oil in the running body box and are connected to the outside need oil seals. Some are rubber, some are metal, and most are steel bone rubber, such as crankshaft rear oil seal, gearbox front and rear oil seal, left and right half shaft oil seal, final reducer front oil seal, air compressor crankshaft oil seal, etc.
Oil seal is an important sealing element used in mechanical equipment, and its functions and uses also include the following aspects:
Prevent liquid leakage
One of the main functions of oil seals is to prevent liquid (such as lubricating oil, hydraulic oil, etc.) from leaking from the rotating shaft or moving parts of mechanical equipment. Through contact with the surface of the rotating shaft, the oil seal forms a sealed contact area, effectively preventing the leakage of liquid, ensuring that the liquid circulates and works inside the equipment.
Prevent dust and contaminants from entering
In addition to preventing liquid leakage, oil seals also prevent dust, particles, and other contaminants from entering critical parts of machinery and equipment. Oil seals are usually equipped with dust lips that can effectively seal the inside of the equipment, keep the work area clean, and reduce wear and damage to the internal parts of the equipment.
Reduce friction and wear
The oil seal forms a lubricating film between the rotating shaft and the sealing lip, which can reduce friction and wear between the rotating parts. This helps to extend the life of the equipment and improve its efficiency and performance.
Reduce vibration and noise
Proper installation and use of oil seals can reduce the vibration and noise of the equipment. They provide a stable seal against leakage of liquids or gases and noises caused by vibrations.
Protect equipment and environment
The effective function of oil seals can protect machinery and equipment from external environment, such as water, dust, chemicals, etc. They help ensure reliable operation of equipment in harsh conditions and reduce negative environmental impacts.
In conclusion, oil seals play a key sealing role in mechanical equipment, protecting equipment from problems such as fluid leakage, dust contamination, and frictional wear. They are essential for the proper function, longevity, and performance of equipment, and are widely used in many industries and applications, such as automobiles, industrial machinery, power equipment, and more.
Type and use
Plain Single Lip B (SC)
It is generally used for high-speed and low-speed rotating shafts and reciprocating motion to seal mineral oil and water and other media.
Ordinary oil seal, used in the case of less dust and impurities, when the medium pressure is <0.05MPa, the maximum linear speed is 15m/s, and the reciprocating speed is <0.1m/s.
Plain Double Lip FB (TC)
In addition to the above-mentioned characteristics of S-type oil seals, they are also dustproof.
Ordinary oil seal, with dustproof lip can be dustproof, when the medium pressure is < 0.05MPa, the linear speed is ≤15m/s.
Springless BV
Springless, single-lip inner encapsulated skeleton rubber oil seal.
Generally, it is suitable for low-speed working conditions, and the sealing medium is lubricating ester. Linear speed≤ 6m/s.
Exoskeleton single lip W
Single-lip exposed skeleton rubber oil seal with spring, thin waist, good follow-up and good rigidity.
Ordinary oil seal, used in the case of less dust and impurities, resistant to medium pressure < 0.05MPa. The speed of the axis of rotation ≤ 15 m/s.
Exoskeleton double lip FW
Exposed skeleton rubber oil seal with secondary lip, thin waist, good followership, high stiffness, and good coaxiality.
Ordinary oil seal, with dust-proof lip can be dust-proof, and the medium pressure is < 0.05MPa. Rotational speed≤ 15m/s.
Fabricated single-lip FZ
The outer skeleton oil seal formed by the inner and outer skeleton is assembled and piping, and has the characteristics of high installation accuracy, fast heat dissipation and heavy load.
It is suitable for heavy load conditions under high temperature and high speed conditions, the medium pressure ≤ 0.05MPa, and the maximum linear speed ≤ 15m/s.
One-way reflow type right-handed SR, left-handed DL
The diagonal ribs with angles are measured in the air of the lip, and the principle of fluid mechanics is used to produce a one-way pumping effect, which has a reflux effect.
It is related to the rotation direction of the shaft, due to the reflux effect, the radial force is smaller than that of the ordinary oil seal, which reduces wear and heat generation, improves the service life, and is suitable for occasions where the medium pressure is < 0.05MPa, and the speed is ≤ 20m/s.
Pressure-resistant type NY
The lips are short, the waist is short and thick, and it has a pressure-resistant effect, and the working pressure is ≤ 3MPa.
It is suitable for the occasion of medium pressure ≤ 3MPa, and is suitable for the shaft end oil seal of high-pressure pump, and the PV value is ≤8 under normal circumstances. The rotational axis velocity ≤ 15m/s.
Standards & Sizes
German DIN standards are generally divided into A, AS, B, BS, C, C, and other structural forms. Among them, type A is a single lip of ordinary outer rubber, type B is a single lip of the outer skeleton, and type C is a single lip of the outer skeleton double skeleton (box type); The S in AS, BS, CS generally stands for the dust lip, which is the double lip (with dust lip) structure of the corresponding structural form.
The general size of a single lip oil seal
| No. | Model | Spec | No. | Model | Spec |
| S0003 | SC | 09*016*04 | S0004 | SC | 12*022*04 |
| S0005 | SC | 12*022*06 | S0006 | SC | 13*022*04 |
| S0007 | SC | 14*020*05 | S0008 | SC | 14*028*10 |
| S0009 | SC | 15*022*05 | S0010 | SC | 15*023*07 |
| S0011 | SC | 15*032*07 | S0012 | SC | 15*040*10 |
| S0013 | SC | 16*040*08 | S0014 | SC | 17*024*05 |
| S0015 | SC | 17*035*05 | S0016 | SC | 17*035*08 |
| S0017 | SC | 17*045*07 | S0018 | SC | 18*026*06 |
| S0019 | SC | 18*030*05 | S0020 | SC | 18*032*10 |
| S0021 | SC | 18*035*07 | S0022 | SC | 19*027*06 |
| S0023 | SC | 19*035*08 | S0024 | SC | 19*047*10 |
| S0025 | SC | 20*35*07 | S0026 | SC | 20*035*10 |
| S0027 | SC | 20*046*08 | S0028 | SC | 20*052*09 |
| S0029 | SC | 22*035*06 | S0030 | SC | 22*036*06 |
| S0031 | SC | 22*036*10 | S0032 | SC | 22*038*06 |
| S0033 | SC | 22*046*08 | S0034 | SC | 23*036*06 |
| S0035 | SC | 24*036*08 | S0036 | SC | 24*038*07 |
| S0037 | SC | 24*052*10 | S0038 | SC | 25*034*07 |
| S0039 | SC | 25*062*07 | S0040 | SC | 27*047*10 |
| S0041 | SC | 28*035*06 | S0042 | SC | 28*043*07 |
| S0043 | SC | 30*037*08 | S0044 | SC | 30*040*07 |
| S0045 | SC | 30*046*07 | S0046 | SC | 30*062*12 |
| S0047 | SC | 30*072*08 | S0048 | SC | 31*047*07 |
| S0049 | SC | 32*045*08 | S0050 | SC | 32*058*10 |
| S0051 | SC | 33*052*06 | S0052 | SC | 33*066*12 |
| S0053 | SC | 35*046*07 | S0054 | SC | 35*050*12 |
| S0055 | SC | 35*052*06 | S0056 | SC | 35*052*10 |
| S0057 | SC | 35*056*08 | S0058 | SC | 36*047*07 |
| S0059 | SC | 36*068*10 | S0060 | SC | 38*056*10 |
| S0061 | SC | 38*062*08 | S0062 | SC | 40*060*08 |
| S0063 | SC | 40*070*08 | S0064 | SC | 42*052*07 |
| S0065 | SC | 43*055*07 | S0066 | SC | 44*060*08 |
| S0067 | SC | 44*060*10 | S0068 | SC | 44*072*10 |
| S0069 | SC | 45*080*10 | S0070 | SC | 47*057*07 |
| S0071 | SC | 47*060*07 | S0072 | SC | 47*065*10 |
| S0073 | SC | 50*062*08 | S0074 | SC | 50*065*08 |
| S0075 | SC | 50*070*08 | S0076 | SC | 50*070*12 |
| S0077 | SC | 50*072*07 | S0078 | SC | 50*072*14 |
| S0079 | SC | 52*068*08 | S0080 | SC | 52*085*10 |
| No. | Model | Spec | No. | Model | Spec |
| S0081 | SC | 54*080*10 | S0082 | SC | 55*068*08 |
| S0083 | SC | 55*080*13 | S0084 | SC | 55*090*12 |
| S0085 | SC | 56*070*08 | S0086 | SC | 56*080*08 |
| S0087 | SC | 56*085*08 | S0088 | SC | 56*100*10 |
| S0089 | SC | 57*080*12 | S0090 | SC | 57*085*10 |
| S0091 | SC | 58*072*08 | S0092 | SC | 58*080*08 |
| S0093 | SC | 60*090*08 | S0094 | SC | 62*080*12 |
| S0095 | SC | 110*150*14 | S0096 | SC | 115*145*13 |
| S0097 | SC | 115*145*14 | S0098 | SC | 120*140*12 |
| S0099 | SC | 120*160*12 | S0100 | SC | 125*160*12 |
| S0101 | SC | 125*160*16 | S0102 | SC | 135*160*12 |
| S0103 | SC | 135*170*12 | S0104 | SC | 140*170*12 |
| S0105 | SC | 140*170*13 | S0106 | SC | 140*180*12 |
| S0107 | SC | 145*175*15 | S0108 | SC | 110*150*14 |
| S0109 | SC | 115*145*13 | S0110 | SC | 115*145*14 |
| S0111 | SC | 120*140*12 | S0112 | SC | 120*160*12 |
| S0113 | SC | 125*160*12 | S0114 | SC | 125*160*16 |
| S0115 | SC | 135*160*12 | S0116 | SC | 135*170*12 |
| S0117 | SC | 140*170*12 | S0118 | SC | 140*170*13 |
| S0119 | SC | 140*180*12 | S0120 | SC | 145*175*15 |
| S0121 | SC | 80*110*12 | S0122 | SC | 80*120*12 |
| S0123 | SC | 82*105*10 | S0124 | SC | 82*105*13 |
| S0125 | SC | 85*100*13 | S0126 | SC | 85*120*12 |
| S0127 | SC | 95*105*13 | S0128 | SC | 95*110*10 |
| S0129 | SC | 95*145*10 | S0130 | SC | 100*120*10 |
| S0131 | SC | 155*190*15 | S0132 | SC | 165*195*15 |
| S0133 | SC | 180*220*16 | S0134 | SC | 185*210*13 |
| S0135 | SC | 200*225*15 | S0136 | SC | 210*240*15 |
| S0137 | SC | 215*240*12 | S0138 | SC | 230*260*15 |
| S0139 | SC | 240*270*15 | S0140 | SC | 260*300*18 |
| S0141 | SCI | 220*250*15 | — | — | — |
The general size of the lip oil seal
| No. | Model | Spec | No. | Model | Spec |
| T0001 | TC | 05*015*06 | T0002 | TC | 05*016*06 |
| T0003 | TC | 05*017*07 | T0004 | TC | 05*018*07 |
| T0005 | TC | 05*019*07 | T0006 | TC | 05*022*07 |
| T0007 | TC | 06*016*05 | T0008 | TC | 06*016*07 |
| T0009 | TC | 06*017*07 | T0010 | TC | 06*018*07 |
| T0011 | TC | 06*019*07 | T0012 | TC | 06*020*5.5 |
| T0013 | TC | 06*022*07 | T0014 | TC | 06*025*08 |
| T0015 | TC | 06*026*07 | T0016 | TC | 06*035*07 |
| T0017 | TC | 07*016*07 | T0018 | TC | 07*017*07 |
| T0019 | TC | 07*018*07 | T0020 | TC | 07*019*07 |
| T0021 | TC | 07*020*07 | T0022 | TC | 07*022*06 |
| T0023 | TC | 07*022*07 | T0024 | TC | 07*031*07 |
| T0025 | TC | 08*014*05 | T0026 | TC | 08*015*05 |
| T0027 | TC | 08*016*07 | T0028 | TC | 08*017*07 |
| T0029 | TC | 08*018*05 | T0030 | TC | 08*018*06 |
| T0031 | TC | 08*018*07 | T0032 | TC | 08*019*07 |
| T0033 | TC | 08*020*07 | T0034 | TC | 08*021*06 |
| T0035 | TC | 08*022*06 | T0036 | TC | 08*022*07 |
| T0037 | TC | 08*023*05 | T0038 | TC | 08*023*07 |
| T0039 | TC | 08*024*07 | T0040 | TC | 08*025*07 |
| T0041 | TC | 08*025*08 | T0042 | TC | 08*025*09 |
| T0043 | TC | 08*026*07 | T0044 | TC | 08*028*05 |
| T0045 | TC | 08*030*06 | T0046 | TC | 08*030*07 |
| T0047 | TC | 08*034*08 | T0048 | TC | 09*018*07 |
| T0049 | TC | 09*019*05 | T0050 | TC | 09*019*07 |
| T0051 | TC | 09*020*07 | T0052 | TC | 09*022*07 |
| T0053 | TC | 09*024*07 | T0054 | TC | 09*025*07 |
| T0055 | TC | 09*026*07 | T0056 | TC | 09*029*07 |
| T0057 | TC | 09*030*07 | T0058 | TC | 10*016*04 |
| T0059 | TC | 10*016*07 | T0060 | TC | 10*017*05 |
| T0061 | TC | 10*017*07 | T0062 | TC | 10*018*04 |
| T0063 | TC | 10*018*05 | T0064 | TC | 10*018*06 |
| T0065 | TC | 10*018*07 | T0066 | TC | 10*019*07 |
| T0067 | TC | 10*019*10 | T0068 | TC | 10*020*05 |
| T0069 | TC | 10*020*07 | T0070 | TC | 10*021*04 |
| T0071 | TC | 10*021*06 | T0072 | TC | 10*021*07 |
| T0073 | TC | 10*022*05 | T0074 | TC | 10*022*06 |
| T0075 | TC | 10*022*07 | T0076 | TC | 10*023*07 |
| T0077 | TC | 10*023*08 | T0078 | TC | 10*024*04 |
| T0079 | TC | 10*024*06 | T0080 | TC | 10*024*07 |
Precautions
Preparation and precautions before starting
a. Comprehensively check whether the mechanical seals, as well as the installation of accessories and pipelines are complete and meet the technical requirements.
b. Static pressure test is carried out before the mechanical seal is started to check whether the mechanical seal has leakage. If there is a lot of leakage, the cause should be investigated and eliminated. If it still doesn’t work, you should disassemble it for inspection and reinstall it. Generally, the static pressure test pressure is 2~3 kg/cm².
c. Press the pump to turn the crank and check whether it is light and even. If the cranking is struggling or does not move, it should be checked whether the assembly size is wrong and whether the installation is reasonable.
Installation and shutdown
a. The sealing chamber should be kept filled with liquid before starting. For conveying solidified media, the sealing chamber should be heated with steam to melt the medium. It must be coiled before starting to prevent the soft ring from shattering due to sudden starting.
b. For the mechanical seal that uses the external oil sealing system of the pump, the oil sealing system should be started first. The oil sealing system is stopped at the end of the shutdown.
c. After the hot oil pump is stopped, the cooling water of the sealing chamber and the end seal can not be stopped immediately, and the cooling water can only be stopped when the oil temperature at the end seal drops below 80 degrees, so as not to damage the sealing parts.
Operation
a. If there is a slight leakage after the pump is started, it should be observed for a period of time. If the leakage does not decrease after 4 hours of continuous operation, the pump should be stopped for inspection.
b. The operating pressure of the pump should be stable, and the pressure fluctuation should not be greater than 1 kg/cm².
c. During the operation of the pump, the phenomenon of evacuation should be avoided, so as not to cause dry friction on the sealing surface and seal damage.
d. The sealing situation should be checked frequently. During operation, when its leakage exceeds the standard, the heavy oil is not more than 5 drops/min, and the light oil is not more than 10/min, if there is no improvement trend within 2-3 days, the pump should be stopped to check the sealing device.
Cause of the problem
The main factor causing oil seal leakage
Poor sealing of oil seals is a major factor in oil leakage. When the shaft is worn and forms a groove, even if the new oil seal is replaced, it is because the contact pressure between the oil seal lip and the shaft drops, resulting in the interference between the oil seal lip diameter and the shaft diameter after installation is too small.
Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for the poor sealing are analyzed:
Oil seal leakage refers to the leakage of oil from oil seals used in mechanical equipment or systems. Here are some common causes that can lead to oil leaks from oil seals:
Wear and aging
Long-term use and friction will lead to wear and aging of oil seals, so that they lose their original sealing properties. Abrasion and aging typically occur at the lip or contact surface of the oil seal, allowing the fluid to leak out through the gap.
Improper size
If the oil seal is not properly sized or installed incorrectly, such as too tight or too loose, it can cause the oil seal to not seal properly. This can cause the fluid to come into contact with the external environment through the oil seal and leak.
Contaminants
Contaminants such as particles, dust, dirt, etc., present in the working environment may enter the sealing area of the oil seal, disrupting the sealing performance and causing leakage.
High temperature or high pressure
In a high temperature or high pressure environment, the sealing performance of the oil seal may be affected. High temperatures can cause the rubber material to harden and lose its elasticity, reducing the sealing effect. At the same time, high pressure may cause the lip of the oil seal to deform or rupture, causing the oil to leak.
Installation Error
Incorrect installation of oil seals can also lead to leaks. For example, if an incorrect tool is used or excessive force is applied during installation, it may damage the structure of the oil seal or cause it to be incorrectly positioned, resulting in a leak.
Chemical Attack
Certain chemicals, such as acids, alkalis, or solvents, can attack the material of the oil seal, causing it to lose its sealing properties and leak.
Design defects
In some cases, there may be defects in the design of the oil seal itself, such as improper material selection, unreasonable structural design, etc., which may lead to the failure of the oil seal to seal effectively.
For the cause of oil seal leakage, the following measures can be taken to prevent and solve the problem:
Regularly inspect and replace oil seals, especially in the case of high wear or aging.
Make sure the oil seals are installed correctly and use the correct tools and methods.
Maintain the cleanliness of equipment and the environment and reduce the impact of contaminants on oil seals.
In high-temperature or high-pressure environments, select heat- and pressure-resistant oil seals that are suitable for the conditions.
– Avoid direct contact between chemicals and oil seals, and if possible, choose oil seal materials with better corrosion resistance.
Perform regular equipment maintenance, including inspection and cleaning of the lubrication system, to ensure the proper operation of the oil seals.
By taking proper precautions and timely maintenance, the occurrence of oil seal leakage problems can be reduced and the normal operation and longevity of the equipment can be ensured.
Countermeasures for oil leakage due to poor sealing of oil seals
Master and identify the basic knowledge of fake and shoddy products, and purchase high-quality and standard oil seals.
During installation, if the outer surface roughness of the shaft diameter is low or there are defects such as rust spots, rust, burrs, etc., it should be polished smooth with a fine abrasive cloth or oil stone;
Apply clean oil or grease to the lip of the oil seal or the corresponding position of the shaft diameter. The outer ring of the oil seal is coated with sealant, and the keyway part on the shaft is wrapped with hard paper to avoid scratching the lip of the oil seal, and the oil seal is rotated and pressed inward with a special tool.
If there is a lip flanging, spring falling off and oil seal skewed, it must be removed and reinserted. It should be noted that when the shaft diameter is not worn and the oil seal spring is elastic enough, do not tighten the inner spring without authorization.
When the oil seal applied to machinery is generally under poor working conditions, large ambient temperature difference, dusty weather, and frequent vibration of the machine and implements makes the stress condition of the parts constantly change, it should be inspected, maintained and maintained frequently.
If the shaft diameter and bearing are seriously worn; If the oil seal rubber is aging or the spring fails, etc., the corresponding parts should be repaired and replaced in time.
Troubleshooting of abnormal heating components or assemblies should be eliminated in time; Avoid mechanical overspeed and overload operation to prevent the temperature of the oil seal lip from rising, rubber aging, early wear of the lip, etc.
Check the oil level frequently, if there are too many impurities in the oil, alloy powder, metal iron filings, and completely replace the new oil. The brand and quality of the engine oil should meet the requirements of the season. It is recommended to add Mytre Super Sealant & Lubricant to the engine oil, it is an excellent gearbox additive, it can form an inert material film on the components, it can slow down the leakage of the oil seal, prolong the service life of the oil seal gear, and also reduce the noise of the gearbox, the use of this Mytre Super Seal Lubricant will not cause contamination or deterioration of the oil.
Directions for use
(1) When the volume of lubricating oil of the reducer is ≤ 7 liters, the amount of lubricating oil added per liter is 20‐30ml;
(2) When 7-15 liters, the dosage is 15-20ml per liter of lubricating oil;
(3) When > 15 liters, the addition amount is 10ml per liter of lubricating oil;
The oil seal that is not used temporarily should be properly kept to prevent it from being stained with oil, dust or sun exposure.
When the shaft diameter is worn into a “V” shaped groove, so that the contact pressure between the new oil seal lip and the shaft drops and cannot play the role of sealing the oil, the method of displacement can be used to make up for it.
Merit
As a common sealing device, oil seals play an important role in many mechanical equipment and systems. Here are some of the advantages of oil seals:
Sealing performance
Oil seals are designed to provide an effective seal between the rotating shaft and the stationary housing, preventing leakage of liquids (such as oil) or gases. They are able to provide reliable sealing performance under different operating conditions, preventing environmental contamination and energy loss.
Friction and wear control
Oil seals can reduce friction and wear between the rotating shaft and the oil seal. They are often made of abrasion-resistant materials such as rubber or polyurethane to reduce direct contact with the rotating shaft. This helps to extend the life of the equipment and reduces the frequency of maintenance and replacement of parts.
Prevent contamination
Oil seals prevent external impurities, particles, and dust from entering critical components in machinery or systems. They form a physical barrier on the rotating shaft that prevents impurities from entering and keeps the interior clean. This is essential to protect the uptime and reliability of your equipment.
Adaptability and diversity
Oil seals have a wide range of adaptability and diversity. They are suitable for shafts and housings of various sizes, shapes and operating conditions. Depending on the specific application needs, different types and materials of oil seals can be selected to meet requirements such as sealing performance, wear resistance, and chemical resistance.
Relatively economical
Oil seals usually have a lower cost compared to other sealing devices. They are easy to manufacture and install, and are also relatively economical in terms of maintenance and replacement. This makes oil seals a commonly used sealing solution in many mechanical equipment and systems.
It is important to note that the performance and benefits of oil seals depend in part on the materials used, the design and the correct installation. Therefore, when selecting and using oil seals, the application requirements should be carefully considered and the manufacturer’s recommendations and guidance should be followed to ensure the best possible sealing and performance.
Market trends
With the development of mechanical equipment in the direction of high performance, high precision and high reliability, the performance and quality requirements for oil seals are getting higher and higher. In the future, the oil seal market will show the following trends:
High-performance materials
As the working temperature and pressure of mechanical equipment are getting higher and higher, the material performance requirements for oil seals are also getting higher and higher. In the future, high-performance materials will become the main demand direction of the oil seal market.
Intelligent
With the continuous development of Industry 4.0 and intelligent manufacturing, machinery and equipment will become more and more intelligent. In this case, the oil seal also needs to be intelligent, such as being able to monitor the working status of machinery and equipment and the condition of lubricants in real time.
Personalized customization
Due to the different needs of different mechanical equipment for oil seals, oil seal manufacturers need to have the ability to provide personalized customization services. In the future, oil seal manufacturers who can provide personalized customized services will occupy a dominant position in the market.
Environmental protection and sustainable development
With the continuous improvement of environmental protection and sustainable development awareness, the requirements for the environmental performance and service life of oil seals are also getting higher and higher. In the future, manufacturers of oil seals that can provide environmentally friendly and sustainable components will occupy a more advantageous position in the market.
Integration
With the development of machinery and equipment in the direction of modularization and integration, the requirements for the integration performance of oil seals are getting higher and higher. In the future, manufacturers who can offer better integrated oil seals will be in a better position in the market.
Summary
As an important mechanical seal element, oil seals have the functions of anti-leakage and anti-pollution, and play an important role in various mechanical systems. It has a complex structure and its working principle is based on the principle of friction sealing and liquid pressure equalization. Common types of oil seals include shaft seals, piston seals, and rotary plugging rings, which are widely used in industrial equipment, automotive, aerospace, and other fields.
By using oil seals, you can ensure the normal operation of the mechanical system, extend the life of the equipment, and improve the work efficiency. With the continuous advancement of science and technology, the design and materials of oil seals are also constantly improving to adapt to higher working requirements and environmental conditions. For the future, oil seals will continue to evolve to meet the challenges of emerging fields and industrial developments.
