SKF NU224 ECM Zylinderrollenlager (120x215x40)

As a cylindrical roller bearing, this bearing carries high radial loads with limited axial capacity. The dynamic load rating of 390 kN characterises this bearing. The static load rating is 430 kN. The limiting speed is 3600 rpm. For these items the sealing design and the clearance class are not held as separate catalogue attributes; the type designation and the entries in the specification table are what govern.

Cylindrical roller bearings carry radial force through the line contact between roller and raceway. Compared with a ball bearing of the same size this yields a higher radial load capacity and a stiffer bearing position, but compared with a self-aligning bearing a markedly lower tolerance to misalignment: the roller row accepts only a few angular minutes before the contact pressure migrates to the roller ends, which is why the shaft seat and the housing bore must be aligned to one another.

The axial function of the bearing position follows from the rib arrangement on the inner and outer ring and not from the mounting situation — depending on the version the bearing displaces axially in service and takes up length compensation, or it supports the shaft in one or in both directions. Because the inner ring and the outer ring assembly are separable, the rings can be fitted independently and both executed with a tight seat.

No separate attributes for the sealing design or the clearance of these items are held in the catalogue. Both are to be taken from the type designation and the specification table of the individual item, since both bear directly on the layout: the sealing design decides whether the surrounding construction has to protect the rolling chamber, and the clearance class decides how much radial play the interference fit and the temperature gradient may consume before the roller set goes into preload.