Load carrying capacity
In contrast to normal rolling bearings where the outer ring is supported over its whole circumference by a housing bore and retains its form even under load, the outer ring of a backing bearing only has a small contact area between the outer ring and the supporting roll. This limited support causes deformation of the outer ring which alters the load distribution in the bearing and thus influences the load carrying capacity. The degree of deformation depends on the wall thickness of the outer ring.
The basic load ratings given in the product table under the heading "Roller" take this influence into account. In addition to these ratings, maximum permissible dynamic and static radial forces are also given in the product table. These take into consideration the deformation and strength of the outer ring.
The dynamic load which can be applied to a backing bearing depends on the requisite life, but it is important that the maximum permissible radial force value Fr should not be exceeded. The permissible static load on a backing bearing is determined by either F0r or C0. The smaller of the two values represents the maximum static load.