DichtungLager

Dichtungslager, commonly translated as seal-bearing, is a term in mechanical engineering describing a bearing assembly that incorporates a sealing element to retain lubricant and protect the bearing from contaminants. The concept covers units in which a rolling bearing is paired with a shaft seal, labyrinth seal, or mechanical seal, either integrated into the bearing ring or mounted in the housing as a matched assembly. The seal serves to prevent oil or grease from leaking and to keep dirt and moisture from entering the bearing.

Configurations and types include integrated-seal bearings in standard bearing series, such as deep-groove or angular-contact bearings with rubber or metal shields. More complex variants use labyrinth seals, contact lip seals, or mechanical face seals. Seal materials are typically elastomers such as NBR, HNBR, or FKM, chosen for compatibility with lubricants and operating temperatures. Lubricants can be grease or oil; the seal must tolerate the chosen lubricant and temperature.

Applications include automotive wheel hubs, electric motors, pumps, gearboxes, and industrial machinery where compact seal solutions and reduced maintenance are advantageous. They are also common in wind turbines and other equipment with restricted access.

Design considerations encompass load and speed, shaft misalignment, housing rigidity, seal wear, lubricant life, thermal expansion, and resistance to contaminants. Selection aims to maximize sealing effectiveness while minimizing friction and wear.

Maintenance involves monitoring for leaks, abnormal temperature rise, or seal wear. Depending on design, seals may be replaced with bearings at service intervals or inspected in sealed units.