Page 158 - The Tribology Handbook

B1 Belt drives

DESIGN POWER RATINGS FOR VARIOUS TYPES OF BELT
Wedge belts

1000 1
Section SPZ SPA SPB SPC 8V****
Wmm 9.5 13 16 22 26
Hmm 8 10 14 18 23

P" 40 40 40 40 40
dmm mm* 67 100 160 224 335
(dmm mm 56 80 112)
D, min reverse bending is not allowed
L,,, mm** 525 750 1260 2000 2520

L,,, mm** 3560 4500 9010 12500 11410
W,,, mm*** 72 90 152 306 343
* The d values here and in the power rating chart are for
covered belts. For raw-edge moulded-cog wedge belts
smaller sizes are appropriate, as shown by (bracketed
values).
** Typical stock values (also covered by Standards); other .' I
'
lengths to special order. I
*** Max. number of belts per pulley X width of one pulley 0.1 I
groove 1, (Table 1.2). 100 1000 10,000
**** Rubber manufacturers of America (RMA) standard. Fastest pulley rev/min
Figure 1.4 Power rating of wedge belts

Classical vee belts

Section Z A B C D

Wmm 10 13 17 22 32
Hmm 6 8 11 14 19

P" 40 40 40 40 40
dmin mm 50 75 125 200 355

D; min > Smallest loaded pulley diameter
L,, mm** 270 415 613 920 2570

L,,mm** 1540 5510 12000 10700 15200
W,,, mm*** 72 90 152 306 444
**, *** As above.
P is the total included angle of the belt profile.

100 1000 10,ow
Fastest pulley rev/min
Figure 1.5 Power rating of classical Wee belts
B1.4