Why are sealed bearings favored over the unsealed alternative? Why ought sealed ball bearings be preferred to unsealed ones? What advantages can sealed ball bearings offer?
These oil seals are created from a low-temperature tolerant compound. Benefits include:
Lubricant can be retained in the space between the main lip and the minor lip.
5. Conclusion


Figure 3: Sealing function of main lip radial load
* KOYO is a registered trademark of JTEKT.
Figure 4 shows the features of a JTEKT oil seal.


Assembling the oil seal

What material are oil seals made from?
Figure 5 explains the JTEKT seal numbering system.
Seal numbers consist of
(1) the seal type code,
(2) the spring code,
(3) the lip type code,
(4) the dimensional numbers, and
(5) the special type code,
and Table 6 shows examples of each of these codes/numbers.
Sometimes, two different kinds of fluids leak from one chamber to another and gets mixed up. Here, this type comes as a boon. This is a metal inserted duplex type oil seal recommended on such assembly where mix-up of two different fluids is to be prevented.
Rubber type