Machinery's Handbook, 31st Edition
Classical V-Belts
2579
.
2
BX : HP
. K 2051 3532 3097 10 . . 3532 1 1 d r p − − + − c ×
4
.
05735
log
d r p
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
.
2
C: HP
4
. K 3325 1207 5828 10 . . 1207 1 1 d r p − − + − c ×
.
06886
log
d r p
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
.
2
CX : HP
4
. K 3272 6655 5298 10 . . 6655 1 1 d r p − − + − c ×
.
08637
log
d r p
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
.
2
D : HP
3
. K 7160 4321 1384 10 . . 4321 1 1 d r p − − + − c ×
.
1454
log
d r p
d r p
d r p
h
h
^
^
=
−
;
E
−
m
SR
5000 4000 3450 3000 2500 2000 1750 1500 1160 1000
A, AX
870 690 600 575 500 400 300 200 150 100
B, BX
C, CX D
1
2 3 4 5 678910 15 20 30
40 50 70 100 200 300 500
700 1000
Design Horsepower
Fig. 4. Selection of Classic V-Belt Cross Sections In these equations, d p = pitch diameter of small sheave, in.; r = rpm of the faster shaft divided by 1000; K SR = speed ratio factor given in the accompanying Table 10. These for mulas give the basic horsepower rating, corrected for the speed ratio. To obtain the horse power per belt for an arc of contact other than 180 degrees and for belts shorter or longer than average length, multiply the horsepower obtained from these formulas by the length correction factor (Table 11) and the arc of contact correction factor (Table 12).
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