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4.6.4
Drum rotation drive belt
These appliances are fitted with elastic drive belts. The motor is
mounted in a fixed position, and no regulation is possible.
1. Motor pulley
2. Elastic drive belt
3. Drum pulley
Different types of drive belts, produced by various manufacturers and with different characteristics, are used
in production:
•
rubber belts (black)
•
plastic belts (yellow)
The length marked on the drive belt (1217, 1280 etc.) is the working length based on the belt mounted on
the pulleys, which is calculated according to the following parameters:
∅ D = diameter of drum pulley
∅ de = diameter of motor pulley
I = centre-line distance between the pulleys
For a given working length, the belts - which consist of different materials - have a different degree of
elasticity. This means that, when not fitted to the appliance, their lengths may be different. It is normal that
the length of a plastic belt not fitted to the pulleys is three or four centimetres greater than that of a rubber
belt.
The belts are of the poly-V type, and are marked with two further parameters:
•
shape of the drive belt (J / H)
•
number of teeth (4, 5, 6, 8)
2005.11 dmm
27/60
3
2
1
599 37 38-46
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