What is Oil Seals ?

Oil seals are used for automobile engines and geared motors, and are designed mainly to prevent oil leakage from the end of a rotating shaft, or dust intrusion from the outside air.

Oil seals serve to prevent the leakage not only of lubricants, but also water, chemicals, and gas from "gaps" in machinery. Oil seals also serve to prevent the intrusion of dust, soil and sand from the outside air.

Oil seals are indispensable sealing devices and are used in various fields, including automobiles, aircraft, boats and ships, railroad vehicles, construction machinery, farm machinery, petrochemical plants, and electrical home appliances.

Sealing Element (Rubber)

An oil seal normally consists of three basic components : Sealing Element, Metal Case, and Spring. It is a widely used sealing component. The function of a seal is to prevent the leakage of medium along the moving parts. This is mainly achieved by the sealing element. The materials normally used are Nitrile, Acrylic, Silicone, and Fluorinated Rubber.

Nitrile Rubber (NBR)

NBR is most commonly used material. It has good heat resistance properties, good resistance to oils, salt solutions, hydraulic oils, and gasoline. Operation temperatures are recommended from -40  to 120 C. It also functions well under dry environment, but only for intermittent periods. The disadvantage is poor chemical resistance.

Note: The following pictures illustrate the correct and wrong assemble.

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