Skeleton Oil Seal

This structure is a composite sealing component consisting of a rubber-coated metal skeleton, integrating an elastomer sealing lip, a reinforcing metal case, and, in most designs, a garter spring. Among these elements, the sealing lip plays the most critical role, as it directly contacts the rotating shaft and forms the primary sealing interface. The metal skeleton provides structural rigidity and ensures proper positioning within the housing, while the rubber coating enhances sealing performance and prevents leakage along the outer diameter.

The core function of this type of seal is to provide reliable dynamic sealing for high-speed rotating shafts. During operation, the sealing lip maintains continuous, controlled contact with the shaft surface. Assisted by the garter spring, the lip applies consistent radial pressure, compensating for wear, shaft eccentricity, and thermal expansion. This design effectively prevents lubricating oil or grease from leaking out of the system, while simultaneously blocking external dust, dirt, moisture, and other contaminants from entering the bearing or mechanical assembly.

Oil seals of this structure are widely used in motors, gearboxes, pumps, transmissions, bearings, and various rotating machinery where stable lubrication and long service life are essential. Depending on the operating environment, the rubber lip can be manufactured from different elastomers such as NBR, FKM (Viton), silicone, or other specialized materials to ensure resistance to heat, oil, chemicals, and aging. The metal skeleton is typically made from carbon steel or stainless steel to provide strength and corrosion resistance.

Thanks to their compact structure, high sealing efficiency, and adaptability to demanding operating conditions, rubber-coated metal oil seals offer excellent reliability in continuous rotation applications. Proper material selection, precise shaft surface finish, and correct installation are essential to achieving optimal sealing performance and extended service life in dynamic sealing systems.