Machinery's Handbook, 31st Edition
2584 Double V-Belts Cross Section Selection: Use the chart (Fig. 6) as a guide to the double V-belt cross sec tion for any combination of design horsepower and speed of the faster shaft. When the in- tersection of the design horsepower and speed of the faster shaft falls near a line between two areas on the chart, it is best to investigate the possibilities in both areas. Special cir cumstances (such as space limitations) may lead to a choice of belt cross section different from that indicated in the chart.
1-1/4 ”
7/8 ”
21/32 ”
1/2 ”
1 ”
23/32 ”
17/32 ”
13/32 ”
AA
DD
BB
CC
Fig. 5. Double-V Belt Cross Section
10,000
4,000 3,000 2,500 2,000 1,500 1,000
AA
BB
900 800 700 600 500 400 300 200
CC
DD
100
1
2
5
10 15 20 25 5060 100
200
500
Design Horsepower (Horsepower × Service Factor)
Fig. 6. Selection of Double V-Belt Cross Section Effective Diameter Determination: Fig. 6 shows the relationship of effective diameter, outside diameter, and nomenclature diameter. Nomenclature diameter is used when order ing sheaves for double V-belt drives. The effective diameter is determined as follows: h a 2 2 Effective diameter Nomenclature diameter d p = − The values of 2 h d and 2 a p are given in Table 14. Double V-belt Length Determination: The effective belt length of a specific drive may be determined by making a scaled layout of the drive. Draw the sheaves in terms of their
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