Non-locating and locating bearing arrangements
Non-locating bearing arrangements with self-aligning ball bearings and spherical roller bearingsThe bearing seats in the housings are sufficiently wide to allow axial displacement of the bearing (fig 1). The seats are machined to a G7 tolerance to provide a loose fit.
Non-locating bearing arrangements with CARB bearingsCARB bearings are non-locating bearings and cannot be used in the locating position. Because these bearings are designed to accommodate axial displacement internally, locating rings should be inserted in the housing on each side of the bearing to prevent the outer ring from moving.
The possible axial displacement of one CARB bearing ring with respect to the other depends on several factors and can be calculated, see section CARB toroidal roller bearings. Note that axial displacement of the shaft relative to the housing may be limited by the seal.
The table shows the maximum permissible axial displacement for CARB bearings with Normal radial internal clearance when mounted. It is assumed that there is little difference in temperature between inner and outer ring.
When a ring of a caged CARB bearing is displaced relative to the other, the cage may protrude from the bearing rings. To avoid the locking device fouling the cage, bearings on an adapter sleeve in the C 22 K series up to and including size 22 are supplied with a special adapter sleeve with a narrow slot and a self-locking KMFE nut, identified by the suffix E. For bearings in the C 22 K and C 32 K series from size 24 and above, adapter sleeves are supplied equipped with a KML nut, indicated by suffix L. When locking a CARB bearing with a cylindrical bore, similar lock nuts should be used.