ZEN NNF5018-PP-V-2NR Zylinderrollenlager (90x140x67)

As a cylindrical roller bearing, this bearing carries high radial loads with limited axial capacity. This ZEN bearing measures 90x140x67 mm and weighs 3.71 kg; the specification table carries the supplementary technical details. Because the seal lip bears against a counterface, an additional frictional torque arises; the permissible speed of this version therefore lies below that of an open type of the same size.

The contact seal on both sides closes the rolling chamber of the cylindrical roller bearing off from its surroundings. In practice that means two things: the lubricant introduced stays where the roller set needs it, and dust, wear debris or splash water do not reach the line contact between roller and raceway, where even small hard particles leave indentations behind.

This version therefore suits bearing positions at which adequate housing sealing cannot be realised structurally, or at which relubrication in service cannot be carried out reliably. The counterpart is a higher frictional torque: the seal lip rubs on its counterface, generates heat there and limits speed more distinctly than the rolling contact itself does.

The seal material likewise limits the permissible operating temperature and the compatibility with process media; both have to be checked against the ambient conditions of the bearing position before use. It should also be noted that the seal can restrict the separability of the design — fitting and removal then follow the manufacturer's instructions for the sealed version rather than the procedure for the open roller set.

The load-carrying properties remain unchanged: the line contact of the cylindrical rollers takes the radial force, the rib arrangement determines whether and in which direction the bearing position supports axially, and the roller row tolerates only slight misalignment. The normal radial clearance is matched to common fits and operating temperatures.