BS 3733:1974

Co-operating organizations
Foreword
Specification
1 General
1.1 Scope
1.2 Definitions
2 V-belts
2.1 Materials and workmanship
2.2 Cross section dimensions
2.3 Determination of belt pitch length
2.4 Matched belts
2.5 Marking
3 Pulleys for V-belts
3.1 Materials
3.2 Finish
3.3 Tolerances
3.4 Balancing of pulleys
3.5 Standard dimensions of pulleys
Appendices
A Recommendations for quarter-turn drives
B Recommendations and drive design examples for power
     application of V-belt drives on agricultural
     machinery
C Recommended practice for installation tension in
     V-belt drives and calculation of the resultant
     forces imposed on the shaft by V-belts
Tables
1 Cross section dimensions of standard V-belts
2 Cross section dimensions of double V-belts
3 Cross section dimensions of variable speed V-belts
4 Tolerance and force requirements when measuring new
     standard V-belts
5 Tolerance and force requirements when measuring new
     double V-belts
6 Tolerance and force requirements when measuring new
     variable speed V-belts
7 Dimensions of pulleys for measuring new V-belts
8a A section V-belts: standard pitch lengths and
     permissible length variations
8b B section V-belts: standard pitch lengths and
     permissible length variations
8c C section V-belts: standard pitch lengths and
     permissible length variations
8d D section V-belts: standard pitch lengths and
     permissible length variations
9 Double V-belts: range of pitch length
10 Variable speed V-belts: range of pitch length
11 Dimensions of standard V-grooved pulleys
12 Dimensions of variable speed pulleys
13 Quarter-turn drives: dimensions of deep groove
     pulleys
14 Recommended minimum pitch diameters for tension and
     guide pulleys
15 Quarter-turn drives: offset between shafts and
     pulleys
16 Power correction factors for arc of contact showing
     proportion of power rating at 180 deg arc of
     contact for V-V and V-flat drives
17 Power correction factors for belt pitch length
18 Installation and take-up allowances
19 Pitch diameter correction factors
20 Tension ratio factor R/(R - 1)
21 Deflection force required for measuring
     installation tension in V-belt drives
22 Values of K to correct for the effect of
     centrifugal tension
Figures
1 Pulleys requiring dynamic balancing
2 Quarter-turn drives
3 Power rating graph
4 Pitch location with various belt and pulley
     arrangements
5 Belt deflection measurement

Single and double V-belts, matched belts, V-grooved pulleys, pulleys with movable flanges for variable speed drives. Dimensions, finish, balancing. New methods for pitch length designation and power design calculation of double V-belts. Recommendations for ¼-turn drives and installation tension.

Withdrawn:This standard is no longer used