Radial shaft seal

Shaft seals (WDR) are seals that are used to (mostly waves or push rods ) seal machine housing to emerging elements from the environment.

Radial shaft sealing ring

Generally

Radial shaft sealing rings ( RWDR ) can be installed with a permanent seat in the housing or cover. Its sealing lip runs on the surface of the rotating shaft, and is usually from a hose spring ( garter spring ) is pressed radially onto the shaft surface. In order to reduce wear on the rubber lip and to ensure the sealing effect, high demands are made on the quality of the shaft surface; often the shaft is therefore ground without twisting in the field of sealing tread. Newer designs of RWDR sometimes have no more worm spring ( diaphragm shaft seals ) or have a PTFE sealing lip.

Contrary to its original purpose to use RWDR as a fork seal on motorcycles to prevent leakage of oil and air between the state and dip tubes and thus ensure the function of the integrated in the fork damper. When compression and rebound seals move axially over here (mostly polished and plated ) sliders away.

At pressure differences between the areas separated by the seal, the open side of the sealing ring should be facing the higher pressure region. The sealing lip is then pressed by the pressure differential across the shaft. In the inverted case, the sealing lip against the spring force of the shaft can be pushed away. The sealing effect is then lost.

The most common radial shaft seals are standardized in Germany in the DIN standard DIN 3760.

Simmer ring

Often, a radial shaft seal is colloquially referred to as simmer ring. These product names, and simmer ring is a registered trademark of Freudenberg Sealing Technologies.

Simmer ring is derived from the name of its developer, the then working at Freudenberg Austrian engineer (later Professor ) Walther Simmer. He developed this component in 1929, first made ​​of leather and metal in Kufstein, Tirol, Austria.

Axial shaft seal

Axialwellendichtringe be used to fulfill minor sealing tasks, such as dust and splash water protection. In contrast to the radial shaft sealing ring, the sealing lip seals here not on the shaft, but normally on a housing part in the axial direction.

Most common types are the V- ring and the gamma ring which additionally exerts a labyrinth function.

Frequently Axialwellendichtringe be used as a secondary seal of RWDR when an exceptional dirt loading can be expected. Examples include applications in construction machinery or train.

Interest is the performance of the V- ring at high speed. The sealing lip lifts off, and the gasket then functions as a slinger. Thus, no power loss occurs more.