Machinery's Handbook, 31st Edition
Narrow V-Belts
2573
5000 4000 3450 3000 2500 2000 1750 1500 1160 1000
3VX
870 690 575 500 400 300 200 150 100
5VX, 5V
8V
1
2 3 4 5 678910 15 20 30
40 50 70 100 200 300 500
700 1000
Design Horsepower
Fig. 2. Selection of Narrow V-Belt Cross Section Table 4. Speed Ratio Correction Factors
K SR
K SR
Cross Section 3VX 5VX
Cross Section
Speed Ratio a Range
Speed Ratio a Range
5V
8V
1.00–1.01 1.02–1.03 1.04–1.06 1.07–1.09 1.10–1.13 1.14–1.18 1.19–1.25 1.26–1.35 1.36–1.57 Over 1.57
0.0000 0.0157 0.0315 0.0471 0.0629 0.0786 0.0944 0.1101 0.1259 0.1416
0.0000 0.0801 0.1600 0.2398 0.3201 0.4001 0.4804 0.5603 0.6405 0.7202
1.00–1.01 1.02–1.05 1.06–1.11 1.12–1.18 1.19–1.26 1.27–1.38 1.39–1.57 1.58–1.94 1.95–3.38 Over 3.38
0.0000 0.0963 0.2623 0.4572 0.6223 0.7542 0.8833 0.9941 1.0830 1.1471
0.0000 0.4690 1.2780 2.2276 3.0321 3.6747 4.3038 4.8438 5.2767 5.5892
a D p / d p , where D p ( d p ) is the pitch diameter of the large (small) sheave. Table 5. Cross Section Correction Factors Cross Section K 1 K 2 K 3
K 4
3VX 5VX 5V 8V
1.1691 3.3038 3.3140 8.6628
1.5295 7.7810 10.123 49.323
0.15960 0.43343 0.46527
1.5229 × 10 − 4 3.6432 × 10 − 4 5.8758 × 10 − 4 1.5804 × 10 − 3
1.1669 Arc of Contact: Arc of contact on the small sheave may be determined by the formulas. Exact formula: cos C D d 2 2 Arc of Contact (deg) e e = − a k –1 Approximate formula: C D d 180 60 Arc of Contact (deg) e e = − − ^ h where: D e = effective diameter of large sheave, inch or mm d e = effective diameter of small sheave, inch or mm C = center distance, inch or mm
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