The thick-walled outer rings of the INA track rollers can support high radial loads. If these track rollers are used against a shaft as a raceway, the outer rings undergo elastic deformation.

Compared to rolling bearings supported in a housing bore, INA track rollers have the following characteristics:

• modified load distribution in the bearing. This is taken into consideration by the basic load ratings Cr w and C0r w that are decisive for life calculation.
• bending stress in the outer ring. This is taken into consideration by the permissible radial loads Fr per and F0r per. The bending stresses must not exceed the permissible strength values of the material (due to the risk of fracture).

Permissible radial load under dynamic loading

For INA bearings under dynamic circumferential load, the effective dynamic load rating Cr w is used. Cr w is used to calculate the basic rating life.

The permissible dynamic radial load Fr per must not be exceeded.
If the basic static load rating C0r w is lower than the basic dynamic load rating Cr w, C0r w is used.

Permissible static radial load

For INA bearings under static load, when stationary or with only infrequent motion, the effective static load rating C0r w is used. C0r w is used to calculate the static load safety factor S0.

The permissible static radial load F0r per must not be exceeded.
In addition to the permissible radial load of the bearing, the permissible radial load of the mating track must also be taken into consideration.
The basic load ratings stated are valid only in conjunction with a shaft as a mating track that is hardened (at least 670 HV) and ground (Ra 0,3).

Fatigue limit loadThe fatigue limit load Cur w is defined as the load below which – under laboratory conditions – no fatigue occurs in the material.