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.

This British Standard specifies requirements for endless V-belts and V-grooved pulleys for agricultural purposes, including pulleys with movable flanges for variable speed drives

Other drives are specified in the following British Standards, BS 1440, BS 3790, and BS AU 150.

NOTE The titles of the British Standards referred in this standard are listed on the inside back cover.