A component of machine that seals lubricants, an oil seal is constructed of rubber, garter spring, and an internal case. While preventing the leakage of lubricants, water, or chemicals, an oil seal also prevents the entry of dust and dirt into a machine.
Simply stated, oil seals are components of a machine that seal lubricants. Lubricants are used in friction-producing parts of the machine, to ensure smooth functioning and long life. Oil seals ensure these lubricants do not leak out through the "Bearing Clearance" of the machine.
With advancement in mechanical engineering, it has become necessary to prevent the leakage of not only lubricants but also water and other chemicals, as well as to prevent the entry of dust and dirt into the machine. Oil seals perform both functions.
-Pollen Filters (A/C Air Filter)