# Y-Bearings Equivalent Dynamic Bearing Load

The equivalent dynamic bearing load is defined as that hypothetical radial load, constant in magnitude and direction, which, if applied, would have the same influence on bearing life as the actual load to which the bearing is subjected (fig).

If the bearing load F is constant in magnitude and direction and acts radially, then P = F and the load can be inserted directly into the life equation. In all other cases the equivalent dynamic bearing load must be calculated.

Y-bearings and Y-bearing units are often subjected to simultaneously acting radial and axial loads. If the resultant load is constant in magnitude and direction, the equivalent dynamic bearing load P can be obtained from the general equations

P = Fr when Fa/Fr = e

P = XFr + YFa when Fa/Fr > e

where

P = equivalent dynamic bearing load, kN

Fa = actual axial bearing load, kN

C0 = static bearing load, kN

f0 = a bearing-dependent calculation factor (see product data)

Y = axial load factor for the bearing

e = limiting value for Fa/Fr

The limiting value e and the load factors X and Y required to calculate the equivalent bearing load for Y-bearings and Y-bearing units can be found in the table. As for deep groove ball bearings, it depends on the relationship f0 Fa/C0.