Tensioning – AR Series

General basic selection criteria :

F : Resulting tensioning force by a pre-tension angle of 20°

FI : Initial operation test-force according guidelines of the belt manufacturer

z : Quantity of belts in drive

2 : Multiplier for the compensation of belt-slippage and/or of centrifugal force generated on belt strands.

* Required test-force for belt deflection of 16 mm per 1000 mm of centre distance.

The relevant deflection by shorter or longer centre distance has to be interpolated accordingly.

Tensioning from “inside” of the belt drive with grooved pulley

Installation in slack span of the belt drive, make sure that the belts are maintaining sufficient contact-arc on the driver- and driven-pulley. By extremely long centre distances between driver and driven pulley it is recommendable to use on the tensioner a deep-grooved pulley to avoid excessive slack beating.

Tensioning with flat roller on belt back

The diameter of the flat tensioning roller should at least measure 2/3of the diameter of the smallest pulley in the drive.
The width of the tensioning roller should be at least 20% wider than the overall width of the belt set.
Installation on the belt back in the slack span, make sure that the belts are maintaining sufficient contact-arc on the driver
and driven pulley.

There are several instruments for checking with the adequate test-force the right tension on your frictional V-belt drive.

Don’t make it with your thumb, you will make an estimation mistake and your belts will wear out prematurely!