Useful calculation for an accurate bearing choice

LOAD APPLIED TO A SINGLE BEARING

Calculation necessary to identify the most suitable bearing for the application depending on the applied loads

LOAD APPLIED TO A SINGLE BEARING

STATIC SAFETY COEFFICIENT

F_s = C_o/F         Where:     C_o= Static load factor    F  = Load applied to the bearing

The static safety factor determines the degree of safety that the bearing user wants to adopt against deformation of the bearing itself. A satisfactory degree of safety to avoid any malfunction should be:

F_s ≥ 3

N.B.: In the two sections of this page we have only considered the static load because, in applications where the speed is relatively low (up to 0.5 m / sec) the sizing is purely static. If the application requires higher speeds, the values ​​of the dynamic allowable loads should be taken into consideration.

CALCULATION OF RESISTANCE

The strength of this material is defined as follows:

P₀ = 750 N/mm²  

For this calculation, the formula derived from HERTZ’s theory is used, relating to the crushing and the specific pressure generated between two solid elastic bodies, by linear contact subjected to a load.

CALCULATION OF DURATION

Bearings’ life depends on the applied load and the number of rotations and is calculated as follows:

L = (C/P)^P                      L_h=(16666/n)x(C/P)^p