High-temperature resistance of CARB toroidal roller bearings

The CARB toroidal roller bearing got its name from the form of the curvature at the contact surfaces within the bearing. The bearing has a single row of long rollers with a slightly curved profile. The internal design enables the bearing to accommodate axial displacement within the bearing, like a cylin￾drical or needle roller bearing, virtually with￾out friction, avoiding the problem of induced axial loads. This eliminates the need for a loose fit for either of the bearing rings.

In addition to eliminating the axial inter￾action between the bearings, the roller and raceway profiles in CARB toroidal roller bear￾ings are designed to automatically adjust the position of the rollers inside the bearing so the load has an optimal distribution along the roller contact length, irrespective of any mis￾alignment. This also avoids high edge stress￾es, so the bearing operates at the optimum stress level, and therefore achieves its theoret￾ical fatigue life under all conditions.

In addition to functioning well under heavy radial loads, CARB toroidal roller bearings also perform very well when subjected to light loads.The low minimum radial load requirement of CARB bearings is important because the minimum load is the requisite load needed for smooth roller operation and reduced risk of roller and raceway smearing, cage hammering, vibration, grease degradation and excessive temperature. Proper minimum load requirements can be predetermined based on the size of the rolling elements, rotational speeds, and lubricant viscosity.