Bearings

Protection from contamination

Protection from contamination

Protection from contamination

Protection from contamination

They prevent the ingress of contaminants and reliably hold the lubricant in the bearing against possible displacement: seals have a major influence on the service life of rolling bearings. An overview.

Seals for rolling bearings are available in countless designs, materials and installation versions. The most widely used designs are the Z cover washer and the 2RS seal. The Z cover washer is pressed firmly into the outer ring. As a non-abrasive seal, it does not generate any additional friction. The 2RS seal is the most commonly used sliding seal. It is made of NBR (acrylonitrile butadiene rubber) as standard and has steel plate reinforcement inside to create the necessary rigidity. This model is clamped into the same groove as a Z cover washer in the outer ring and, depending on the design, rests on the inner ring with one or more sealing lips. The flexible NBR material makes the seal easy to dismantle.

These are only the most common seal types. Depending on the application, there are many other design variants and materials for the 2RS seal. "It makes perfect sense that there are so many different seals for rolling bearings," emphasizes Klaus Findling, managing director of Findling Wälzlager. "They are all optimized for different applications." And Findling's experts know all about the right seals for the desired applications.

Stable temperature, low friction

Temperature stability, for example, is the top priority for the seals used in Findling's Xtemp series of rolling bearings. Two-lip 2RSDD seals made of fluorocarbon rubber (FKM), guided in grooves on both sides, are used here. This material is temperature stable up to 200°C. The high-speed applications of the Xspeed bearings, on the other hand, have different requirements; here, the focus is on the smallest tolerances and low frictional torques. 2RSDD seals are also used for these applications. Their self-heating has been reduced by 10°C compared with the basic version of the 2RS seal. This has a direct impact on the service life of the rolling bearing.

"Not all seals are the same," emphasizes Klaus Findling. "Depending on the application, it must be examined exactly which design makes the most sense." The experts at Findling Wälzlager will be happy to help customers with their selection.

 

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