BS ISO 13050:2014 pdf free.Synchronous belt drives – Metric pitch, curvilinear profile systems G, H, R and S, belts and pulleys.
BS ISO 13050 specifies the principal characteristics of metric pitch curvilinear synchronous endless belts and pulleys in G, H, R, and S profile systems for use in synchronous belt drives (also known in the past as timing belt drives, positive belt drives, gear belt drives) for mechanical power transmission and where positive indexing or synchronization might be required.
The principal belt and pulley characteristics include the following:
a) nominal belt tooth dimensions;
b) belt tooth pitch spacing;
c) belt length and width dimensions and tolerances;
d) belt length measurement specifications;
e) pulley groove dimensions and tolerances;
f) pulley diameter and width dimensions and tolerances;
g) pulley quality specification.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 254, Belt drives — Pulleys — Quality,finish and balance
3 Synchronous belt drive system types
Four profile systems and 14 profiles for curvilinear synchronous drives are standardized.
4 Belt nomenclature
A belt is identified as follows:
a) the belt length or pitch length in millimetres, e.g. 1 400 mm;
b) the profile system, e.g.“G”,”H”,“R”, or“S”;
c the pitch or tooth pitch in millimetres, e.g. 14 mm;
d) the width or belt width in millimetres, e.g 40 mm (for profile system S, the width in millimetres x 10);
e) double-sided belts are designated by adding the letter“D” before the designation of the profile system.
5 Pulley nomenclature
A pulley is identified as follows:
a) the letter“P” indicates a pulley;
b) the number of grooves, e.g. 30;
c) the profile system, e.g. “G”,“H, “R”, or “S”;
d) the pitch or groove pitch in millimetres, e.g. 14 mm;
e) the width or belt width in millimetres, e.g 40 mm (for profile system S, the width in millimetres x 10).BS ISO 13050 pdf download.