Z-522518.01.ZL

Four-row cylindrical roller bearing Z-522518.01.ZL (260x400x250mm) is a popular bearing for rolling mill plant. Its inner sleeve Z-522518.01.LZL (Bushing) are interchangeable parts. FV is a well-known manufacturer of rolling mill bearings.

Four-row cylindrical roller bearings with tapered bore (taper 1:12) are used almost exclusively for the roll necks of rolling mill stands, calenders and roller presses. Their friction is low compared with other roller bsarings. As they are normally mounted with an interference fit on the roll neck, they are particularly suitable for rolling mill applications where the rolling speed is high.

The low bearing cross section allows for relatively large roll neck diameters in comparison with the roll diameter. Since very many rollers can be incorporated, the radial load carrying capacity is extremely high.

Four-row cylindrical roller bearings are only able to accommodate radial loads. They are therefore mounted together with deep groove or angular contact ball bearings, or with taper roller bearings, either radial or thrust designs, which take up the axial loads.

The four and six-row cylindrical roller bearings are of separable design, i.e. the ring or rings with integral flanges and the roller and cage assemblies can be mounted independently of the free rings, or all bearing components can be mounted separately. This considerably simplifies bearing mounting, maintenance and inspection. A certain limited axial displacement of the shaft with respect to the housing can be accommodated wrthin the bearing.

FV four-row cylindrical roller bearings have a cylindrical bore and some sizes are also available with tapered bore. Bearings with tapered bore can be adjusted during mounting to give a certain radial internal clearance or a defined preload.

Four-row cylindrical roller bearings with tapered bore

There is relatively little demand for four-row cylindrical roller bearings with tapered bore; this is reflected in the relatively small number of sizes and designs manufactured by FV. The designs differ principally from those of the four-row bearings with cylindrical bore in that the inner ring is usually in one piece and generally has a taper of 1:12. A few relatively wide bearings have inner rings with a tapered bore of 1:30.

Bearings which have one or more of these features are identified in the bearing tables by the following letters

G: helical groove in bearing bore

W: lubrication grooves in side faces of bearing

Wl: lubrication grooves in side faces of inner ring

WO: lubrication grooves in side faces of outer ring