1 Scope
This document specifies the principal characteristics of synchronous endless and open
belts and pulleys of the profile systems T and AT for use in synchronous belt drives
for mechanical power transmission and where positive indexing or synchronization can
be required.
NOTE Synchronous belt drives have been known by various titles in the past, for example:
timing belt drives, positive belt drives, and gear belt drives.
The principal belt and pulley characteristics include:
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a) nominal belt tooth dimensions;
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b) belt tooth pitch spacing;
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c) belt length and width dimensions;
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d) belt length measurement specifications;
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e) pulley groove dimensions and tolerances;
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f) pulley diameter and width dimensions and tolerances;
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g) pulley quality specification.
The belts of the profile systems T and AT are made of polyurethane with high-tension
fine steel cord tension members in most cases. As far as certain forces are given
in this document, these values are only valid for these kinds of belts. For polyurethane
belts with different tensile cords, i.e. aramid or rubber belts reinforced with glass
fibre, the values can be different. It is intended that the user and the manufacturer
agree about suitable values. Open belts made of thermoplastic polyurethane can be
spliced to work as endless belts in conveyor applications. In this case, the tolerances
are not valid for the splicing area of the endless spliced belt.