ISO 13050 pdf download.Curvilinear toothed synchronous belt drive systems
1 Scope
This International Standard specifies the principal characteristics of synchronous endless belts and pulleys for use in synchronous belt drives 1 ) for mechanical power transmission and where positive indexing or synchronization may be required. The principal belt and pulley characteristics include: a) nominal belt tooth dimensions; b) belt tooth pitch spacing; c) belt length and width dimensions; 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 reference
The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 254:1 998, Belt drives — Pulleys — Quality, finish and balance
3 Belt types
Six belt types for synchronous drives are standardized:
– type H8M (H-type tooth profile);
– type S8M (S-type tooth profile);
– type R8M (R-type tooth profile);
– type H1 4M (H-type tooth profile);
– type S1 4M (S-type tooth profile);
– type R1 4M (R-type tooth profile).
4 Belt nomenclature
A belt is identified by a combination of numbers and letters as follows:
a) the belt pitch length in millimetres;
b) the type of tooth profile;
c) the tooth pitch in millimetres;
d) the width in millimetres or 1 0 times the width in millimetres for the S-type belt;
e) double-sided belts are designated by adding the letter “D” before the tooth profile letter.
EXAMPLE A curvilinear tooth synchronous belt of 1 4 mm pitch, 40 mm wide, 1 400 mm in pitch length is identified as follows:
1 400-H14M-40 for H-type single-sided belt, 1400-DH1 4M-40 for H-type double-sided belt;
400-S1 4M-1 400 for S-type single-sided belt, 400-DS1 4M-1 400 for S-type double-sided belt;
1 400-R14M-40 for R-type single-sided belt, 1400-DR1 4M-40 for R-type double-sided belt.
5 Pulley types
Six pulley types for synchronous drives are standardized:
– type H8M (H-type groove profile);
– type S8M (S-type groove profile);
– type R8M (R-type groove profile);
– type H1 4M (H-type groove profile);
– type S1 4M (S-type groove profile);
– type R1 4M (R-type groove profile).
6 Pulley nomenclature
A pulley for a synchronous drive is identified by the number of grooves, the groove pitch and profile, and the width.
It is identified as is the belt by a combination of numbers and letters as follows:
a) the letter “P” indicates a pulley;
b) the number of grooves;
c) the type of groove profile;
d) the groove pitch in millimetres;
e) the width in millimetres or ten times the width in millimetres for S-type pulleys.
EXAMPLE A pulley for a curvilinear toothed belt which has 1 4 mm pitch and 30 grooves with a nominal width of 40 mm is identified as follows:
P30-H1 4M-40 for H-type pulleys;
P30-S1 4M-0400 for S-type pulleys;
P30-R1 4M-40 for R-type pulleys.