SKF is expanding its range of sealed spherical roller bearings, significantly increasing the number of applications for which they can be used. Currently over 100 sizes are available; bore sizes range from 25 to 340mm and outside diameters range from 52 to 460mm.
Sealed SKF Explorer spherical roller bearings have the same load carrying capacity and, in most cases, the same ISO boundary dimensions as corresponding open bearings, enabling applications to be upgraded simply and cost-effectively.
With integral seals, these bearings are protected against both particle and moisture contamination, enabling them to be relubrication-free in most applications. As the bearings do not require external seals in all but the most aggressive environments, installation is simplified, which further reduces downtime and maintenance costs.
Standard SKF Explorer sealed spherical roller bearings feature acrylonitrile-butadiene (NBR) double-lip seals and high-quality SKF grease. The seals virtually eliminate the risk of lubricant leakage associated with conventional open bearings, thereby minimising their environmental impact. A high-temperature variant with hydrogenated acrylonitrile-butadiene rubber seals (HNBR) and high-temperature SKF grease is also available.
As is the case with all SKF Explorer spherical roller bearings, the sealed variant has a number of features that makes it excellent for use in demanding applications such as material handling, off highway, metal and mining industry
Their self-aligning properties enable the bearings to accommodate misalignment of up to 0.5deg between the shaft and housing, without increasing friction or reducing bearing service life.
SKF Explorer bearings are claimed to provide higher dynamic load carrying capacity than previous designs, enabling design engineers to downsize their application. In addition to being high-capacity, the sealed variants generally also provide longer service life and improved operational reliability due to the built-in cleanliness.