Machinery's Handbook, 31st Edition
2578 Classical V-Belts Minimum Sheave Size: The recommended minimum sheave size depends on the rpm of the faster shaft. Minimum sheave diameters for each belt cross section are listed in Table 9. Cross Section Selection: Use the chart (Fig. 4) as a guide to the Classical V-belt cross section for any combination of design horsepower and speed of the faster shaft. When the intersection of the design horsepower and speed of the faster shaft falls near a line between two areas on the chart, the possibilities in both areas should be investigated. Special circumstances (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 ”
17/32 ”
3/4 ”
13/32 ”
5/16 ”
A
B
C
D
1-1/4 ”
7/8 ”
21/32 ”
1/2 ”
3/4 ”
17/32 ”
13/32 ”
5/16 ”
AX
BX
CX
DX
Fig. 3. Classical V-Belt Cross Sections Horsepower Ratings: The horsepower rating formulas for classical V-belts are:
.
2
A : HP
. K 1004 1652 1547 10 . . 1652 1 1 d + r p − − − c ×
4
. 02126
log
d r P
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
.
2
AX : HP
. K 1462 2239 2198 10 . . 2239 1 1 d r p − − + − c ×
4
.
04238
log
d r p
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
.
2
B : HP
. K 1769 4372 3081 10 . . 4372 1 1 d + r p − − − c ×
4
.
03658
log
d r p
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
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