Machinery's Handbook, 31st Edition
2602
Variable Speed Belts
. 1 453 0 000538
. 009
2
1922
V HP
. 08502
.
. 1453 1 1 r − c
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 2 356 0 000777
. 009
2
.
. 2356 1 1 r − c
2322
V HP
. 1189
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 1 833 0 000589
. 009
2
.
. 1833 1 1 r − c
1926
V HP
. 1046
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 4 189 0 001059
. 009
2
.
. 4189 1 1 r − c
2926
V HP
. 1769
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 5 236 0 001217
. 009
2
.
. 5236 1 1 r − c
3226
V HP
. 2073
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 6 912 0 001148
. 009
2
.
. 6912 1 1 r − c
2530
V HP
. 2395
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 7 854 0 001520
. 009
2
.
. 7854 1 1 r − c
3230
V HP
. 2806
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 7 854 0 002196
. 009
2
.
. 9818 1 1 r − c
4430
V HP
. 3454
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 9 687 0 002060
. 009
2
.
. 9687 1 1 r − c
4036
V HP
. 3566
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 11 519 0 002297
. 009
2
.
. 11519 1 1 r − c
4436
V HP
. 4041
d r p
d r p
d r p
−
h
h
^
^
=
−
−
+
;
E
m
d
K
p
SR
. 13 614 0 002634
. 009
2
. 4564 . 13614 1 1 E In these equations, d p = pitch diameter of small sheave, in.; r = rpm of faster shaft divided by 1000; K SR = speed ratio factor given in the accompanying Table 34. These formulas give the basic horsepower rating, corrected for the speed ratio. To obtain the horsepower for arcs of contact other than 180 degrees and for belts longer or shorter than average length, multiply the horsepower obtained from these formulas by the arc of contact cor- rection factor (Table 36) and the length correction factor (Table 35). Table 34. Speed Ratio Correction Factors Speed Ratio a K SR Speed Ratio a K SR 1.00-1.01 1.0000 1.19-1.24 1.0719 1.02-1.04 1.0136 1.25-1.34 1.0875 1.05-1.08 1.0276 1.35-1.51 1.1036 1.09-1.12 1.0419 1.52-1.99 1.1202 1.13-1.18 1.0567 2.0 and over 1.1373 a D p / d p , where D p ( d p ) is the pitch diameter of the large (small) sheave. . d r p d r p d d r p r K 4836 V HP p SR = − − + − − ^ ^ c h h m ;
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