An oil seal is a type of mechanical seal used to prevent the leakage of oil from machinery components. The dimensions of an oil seal are usually specified in terms of its inner diameter, outer diameter, and thickness. For example, a 38x52x7 oil seal has an inner diameter of 38mm, an outer diameter of 52mm, and a thickness of 7mm.
- The primary function of an oil seal is to create a tight seal between two moving parts, such as a shaft and housing, while allowing for relative motion. This is achieved through the use of a flexible material, such as rubber or synthetic elastomers, which conforms to the surface of the moving part and creates a seal. The seal is typically reinforced with metal or other materials to provide additional strength and durability.
- The primary function of a TC oil seal is to create a barrier between two moving parts, typically a rotating shaft and a stationary housing. By doing so, it prevents the loss of hydraulic fluid or lubricant, which is crucial for the proper functioning of the machine. At the same time, it also prevents external contaminants from entering the system, thus maintaining its cleanliness and extending its service life.
With minor lip
Type code
Table 3: Features of each seal typeDevelopments and issues
When installed, the oil seal’s flexible lip is placed against the rotating shaft, and the casing is pushed into the housing for support. It is crucial that the sealing lip is lubricated to avoid overheating caused by friction.
The hydrodynamic ribsa) provided in one direction on the air side face of the lip ensure higher sealing performance. Rubber type
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The outer part of an oil seal is made of metal or rubber, depending on the intended application. Metal-cased seals are a cost-effective option used when the housing bore is made of the same material, allowing for equal expansion and contraction of the materials during use. Rubber-cased oil seals provide a tight fit and are commonly used when metal-cased seals have the potential to fail. They are corrosion-resistant and capable of withstanding extreme temperatures and pressures.
4. Fluroelastomer also popularly known as Viton. – The high temperature resistant material used in places where temperature is more than 120 Degree Celcius.
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Metal O.D. wall type Ensures improved fitting retention between the seal O.D. and the housing bore.
Although it does have a higher tensile strength and longer wear times than other materials, it is recommended to be used in dry-running applications sparingly or intermittently.
It is wedge-shaped to be pressed against the shaft surface and makes contact with the shaft to ensure sufficient sealing performance and suitability for operation at high peripheral speed.
For more severe oil-seal service at temperatures of 160°C (320°F) or higher for extended periods, more resistant fluoroelastomer compositions are required for long service life. High-fluorine VDF/PMVE/TFE elastomers, along with TFE/olefin FEPM elastomers, are much less susceptible to attack by oil additives. TFE/P fluoroelastomers have the requisite chemical resistance, but have low fluorine content, leading to relatively high swell and to soft vulcanizates with lower wear resistance than desired.
Dust lip