The oil seal prevents water, chemicals, and gas, including lubricating oil, from leaking into the machine, while preventing dust and soil from entering the machine.
The application varies depending on the sealing material.
Synthetic rubber, which constitutes a seal lip, is baked and bonded to the metal ring, and the shaft is held appropriately by the "spring" incorporated to enable sealing of the moving part.
Oil seal when the object to be sealed is on one side and there is no dust.