Radial shaft seals

Radial shaft seals

Radial shaft seals

Radial shaft seals are used between rotating and stationary machine components or between two components in relative motion and consist of two main parts:

A cylindrical outer covering of sheet steel (case) or elastomers that have the requisite interference fit to seal statically against the housing bore.

A sealing lip made of an elastomeric or thermoplastic material that seals dynamically and statically against the shaft.

The lip has a sealing edge that is formed by molding, cutting or grinding.

It is normally pressed against the counter face surface of the shaft, with a defined radial load, by a garter spring.

The edge of the sealing lip and the shaft counter face surface form the most important functional area of a radial shaft seal. The sealing effect of the lip can be enhanced by designing the contact area of the lip with hydrodynamic features.