Table of Contents
ToggleThe importance and application of oil seals
introduction
Oil seal is one of the most important components in mechanical equipment, especially in the lubrication system. It mainly prevents lubricating oil from leaking and avoids external dust and water contamination. This article will discuss in detail the classification and working principle of oil seals. , common applications and specific sizing methods.
What is an oil seal?
Oil seal, as the name suggests, is a seal used to seal lubricating oil. Its main working principle is to form a sealing barrier through close contact with the shaft surface to prevent lubricating oil from leaking from the inside of the equipment to the external environment, while preventing external dust, moisture and other pollutants from entering the inside of the equipment.
In automobiles, aerospace, mechanical equipment and industrial production, oil seals play a particularly important role.
A good oil seal can extend the service life of machinery, avoid repairs, reduce maintenance costs, and improve equipment operation. Therefore, choosing a good oil seal is very important to ensure the normal operation of mechanical equipment.
Classification of oil seals
Oil seals can be divided into many types according to their design and application. Common classification methods include differentiation according to structure, material, lip shape, etc.
Single lip oil seal and double lip oil seal
Single lip oil seal: There is only one sealing lip, usually used to prevent oil leakage. It is also called SC oil seal and SB oil seal.
Double-lip oil seal: In addition to the main sealing lip, there is also a dust-proof lip to prevent external contaminants such as dust and water from entering the interior of the mechanical equipment. For example, 33712 Double Lip Oil Seal is one of the typical representatives of double lip oil seals and performs particularly well in complex environments. It belongs to CR oil seal, and SKF brand is currently the best.
Classification by material
Oil seals are made of various materials, and common ones include fluorine rubber (Viton), nitrile rubber (NBR), silicone rubber, etc. Different materials determine the heat resistance, oil resistance, wear resistance and other properties of the oil seal. For high-temperature and high-pressure environments, fluorine rubber oil seals perform better. In general lubrication applications, nitrile rubber oil seals are more cost-effective, and the usage of nitrile is also huge.
Classified by use
Oil seals are widely used, and the most common application scenarios are Hub Oil Seal and Oil Pump Oil Seal. Hub seals are mainly used for automobile wheels, drive shafts and other parts. Common trucks such as Hino, Isuzu, Toyota, and Mercedes-Benz Heavy Duty trucks play a role in sealing and preventing wear. Pump oil seals are widely used in hydraulic oil pumps, engine oil pumps and other equipment to prevent liquid leakage in the oil pump and withstand a certain pressure resistance.
How oil seal works
The working principle of an oil seal is relatively simple, but its design requires a high degree of precision. Oil seals mainly rely on the flexibility of the elastomer material and the precise fit of the sealing lip to achieve sealing. Typically, the inner diameter of the oil seal is tightly wrapped around the rotating shaft, while the outer diameter is fixed in the housing. During the rotation process, the oil seal prevents lubricating oil from leaking to the outside by tightly contacting the rotating shaft, and prevents external contaminants from entering the inside of the system.
Double Lip Oil Seal is designed to provide extra protection. The main function of its second lip is to act as a dust seal to prevent external dust, moisture and other particles from entering the bearing or other internal components, further improving the reliability of the seal.
Oil seal size selection and application scenarios
Choosing the appropriate oil seal size is critical to the proper operation of the equipment. The common size expression of the oil seal is “inner diameter x outer diameter x thickness”. For example, the oil seal 20x30x7 means that the inner diameter is 20mm, the outer diameter is 30mm, and the thickness is 7mm. 20*30*7 oil seals come in many types of sizes, the most common ones being TC and TB oil seals. When selecting an oil seal, the appropriate size must be determined based on the shaft diameter, installation space and operating environment of the equipment.
In addition, different application scenarios have different requirements for oil seals.
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- Hub Oil Seal: It is often used on vehicle wheel axles or other rotating shafts, which need to withstand the test of high-speed rotation and external pollution. Double-lip oil seals are usually selected to increase the sealing effect.
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- Oil Pump Oil Seal: used in pump equipment, requiring resistance to high pressure, high temperature and good sealing performance. For the sealing needs of oil pumps, it is particularly important to choose materials that are resistant to high temperatures and corrosion, especially when used in high-temperature liquid pumps or chemical pumps.
Manufacturing and market supply of oil seals
As an important base for global manufacturing, China produces a large number of high-quality and highly competitively priced oil seal products. Especially in the sealing industry base in Xingtai City, China, oil seals are abundantly supplied in the Chinese market with a complete range of products, ranging from small oil seals to large industrial seals. At the same time, customized oil seal services are also very common in the Chinese market. Users can choose oil seal products suitable for their equipment according to specific needs.
According to the size, type and material of the oil seal, the oil seal can be searched by size through the online market and purchased from Oil Seal by Size, which provides users with great convenience. For example, oil seal 20x30x7 is a common size and is widely used in various mechanical equipment, especially for some small shaft sealing needs.
Summarize
The role of oil seals in mechanical equipment cannot be ignored. Whether it is a shaft seal or a pump oil seal, correct selection, suitable materials and efficient sealing performance are key factors to ensure long-term and stable operation of the equipment. With the advancement of technology and the improvement of production processes, the types and application scope of oil seals are also constantly expanding. , the quality of oil seal rubber has been significantly improved, and now the performance of equipment has increased significantly. In the future, with the development of industrial automation and high-precision machinery, the design of oil seals will be more complex and sophisticated to adapt to more demanding working environments. Ensuring the selection of the appropriate oil seal type and size is an important step in maintaining equipment stability and reducing maintenance costs.
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