BS AU 218:1987
Withdrawn
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Specification for automotive synchronous belt drives
Hardcopy , PDF
05-15-2000
English
01-29-1988
Foreword
Committees responsible
Specification
Section one. General
1.1 Scope
1.2 Definitions
Section two. Belts
2.1 Belt designation
2.2 Dimensions
2.3 Resistance to ozone
2.4 Resistance to oil
2.5 Resistance to low temperature
2.6 Resistance to high temperature
2.7 Hardness of rubber core
2.8 Tensile strength
2.9 Fabric adhesion
Section three. Pulleys
3.1 Pulley designation
3.2 Groove profile
3.3 Pitch-to-pitch tolerances
3.4 Pulley dimensions
3.5 Material
3.6 Surface finish
3.7 Parallelism
3.8 Taper of outside diameter
3.9 Axial and radial run-out
3.10 Balancing
Appendices
A. Flex fatigue test for belts
B. Measurement of the pitch length of a synchronous
belt
C. Determination of belt resistance to ozone
D. Determination of belt resistance to oil
E. Determination of belt resistance to low temperature
F. Determination of belt resistance to high temperature
G. Determination of tensile strength of belt
H. Determination of fabric adhesion
J. Procedure for checking pulley groove profile
K. Determination of axial and radial run-out
L. Recommendations for design of synchronous belt
drives for internal combustion engines for
automatic purposes
Tables
1. Terms and definitions
2. Nominal belt tooth dimensions
3. Pitch length tolerances
4. Belt width tolerances
5. Minimum tensile strength of belts
6. Loads required to peel fabric from a belt tooth
7. Pulley groove tolerances
8. Pitch and summation of pitch tolerance of pulleys
9. Pulley diameter tolerances
10. Surface finish of synchronous pulleys
11. Axial run-out
12. Radial run-out
13. Test pulley dimensions and characteristics
14. Belt tensions in fatigue test rig
15. Dimensions of belt length measuring fixture pulleys
16. Torque ratings for belts
17. Installation tension for belts
Figures
1. Nominal belt tooth dimensions
2. Pulley groove profile
3. Unflanged, flanged and signle flanged pulleys
indicating position of minimum unflanged width
4. Flange dimensions
5. Limiting speeds above which pulleys require dynamic
balancing
6. Schematic arrangement of fatigue test machine
and pulleys
7. Length measuring fixture
8. Clearance between measuring pulley and belt
9. Measurement of axial run-out
10. Measurement of radial run-out
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