What is the static load capacity C0 of rolling bearings and how is it calculated?
The static load capacity C0, which refers to a non-rotating bearing, is related to the permanent plastic deformation of the raceways and rolling elements, as well as the contact pressure that occurs between them.
The limit of permanent deformation that determines the load capacity is 0.0001 times the diameter of the rolling element, while the maximum pressure, evaluated on the most loaded rolling element, is:
- 4,600 MPa for self-aligning ball bearings,
- 4,200 MPa for all other types of radial ball bearings,
- 4,000 MPa for all radial roller bearings.
C0 is calculated according to ISO 76 standard, which specifies the methods for calculating the basic static load rating and the equivalent static load for rolling bearings within the dimensional ranges indicated in the relevant ISO standards. It applies to bearings manufactured with high-quality, commonly used, contemporary hardened bearing steel, in accordance with good manufacturing practices and essentially having a conventional design with respect to the shape of the rolling contact surfaces.