Standard range - Belting Ware

Flanged pulleys
For the guidance of Optibelt OMEGA HL, Optibelt OMEGA HP
and Optibelt OMEGA timing belts, one or both of the timing pulleys
should be equipped with flanges on one or both sides.
With centre distances of ≥ 8 dwk the timing pulleys should have
flanges on both sides.
We recommend the use of standard timing pulleys. If this is not
possible due to the machine construction, timing pulleys specially
designed for the machine may be used.
66
Small pulley with flanges on both sides
Flanges on alternate sides
Both pulleys with flanges on both sides
Design hints
Flanged pulleys/tension idlers
Maximum OMEGA timing belt width
The maximum timing belt width should not exceed the diameter of
the smallest timing pulley in the drive.
Tension idlers
Idlers are timing or flat pulleys, that play no part in power
transmission within a drive system. Because they generate additional
bending stresses in the belt, they should be used in accordance
with the following guidelines:
● Diameter of the tension idlers ≥ the smallest recommended
pulley diameter for the belt section
● Width of the tension idlers ≥ width of the timing pulleys in the
drive
● Always position the tension idlers in the slack side of the drive
● Internal tension pulleys:
≤ 40 teeth always use a timing pulley
> 40 teeth, a flat faced idler is permissible
● In general, outside idlers should always be flat faced as they run
on the top surface of the belt
● Crowned idlers should never be used
● Fit the tension idlers in such a way as to enable as many teeth
as possible to mesh with the small pulley
● Keep the arc of contact on the tension idler as small as
possible
n 1
n 1
Tight side
Slack side
Tight side
Flat pulley
as far apart as
possible
Slack side
as close
together as
possible