USEFUL CALCULATIONS FOR

BEARINGS’ SELECTION

 

F = (Q×L)/(2×A)

Where:

Q = Load application

L = Distance between the center of gravity of the applied load and the sliding axis of the bearings

A = Distance between the center of gravity of bearings

Calculation necessary for selecting the most suitable bearing for the application from the point of view of the loads applied to the same.

 

STATIC SAFETY FACTOR

Fs = C0/F    

Where:       C0 = Admissible static load rating         F = Applied load to the single bearing

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

Fs ≥ 3

Attention: In the two sections of this page, we took into account only the static load as in applications where the speed is relatively low (up to 0,5m/sec) the sizing is purely static. If the application provides higher speeds the speech should do so considering the allowable loads dynamic.

CALCULATION OF THE SPECIFIC PRESSURE ON THE PROFILES

When an application involves the use of combined bearings and rolled profiles in addition to the dimensioning of the bearing (see previous paragraphs) must also pay attention to the resistance of the profile that unlike the bearing does not require heat treatments that increase the structural strength. Roller profiles type HOESCH supplied from DISTITEC S.R.L. are in structural steel Fe 510C (ST 52-3 U). The resistance of this material is the following:

P0 = 750 N/mm2

For this calculation uses the formula derived from the HERTZ theory relative to the crushing and to the specific pressure that is generated between two solid bodies elastic contact linear subjected to a load. Given the complexity of the calculation suggest that you contact our technical department.

LIFETIME CALCULATION

It depends on the applied load and the number of revolutions and is calculated in the following way: