Page 159 - The Tribology Handbook

Belt drives BI

Wee-ribbed belts

1000 I
Section J K L M
P mrn 2.3 3.6 4.7 9.4
Hmm Varies with manufacturer.
8" 40 40 40 40 100

dmin mm* 20 38 76 180
Di,mm mm* 32 75 1 I5 267
Lmj, mm* 450 - ** 1250 2250
5 10
Lax mm* 2450 - ** 5385 12217
W,,, mm*** 46 72 94 188
* Varies with manufacturer.
** K is designed for automotive use but can be used for
general machinery; some manufacturers also have an H-section, 1
with P = 1.6 rim, and d,,, = 12.7 mm.
*** Wm0, is 20 ribs for stock belts.

0.1
100 1000 10,000
Fastest pulley rev/min
Figure 1.6 Power rating of Vee-ribbed belts

Polyamide core flat belts 1000 1 I 1

Sectionf a b C d

klo,o N/mm** 3 7 15 25
100
dmlnrnm*** 45 90 180 360
DI~m~nmm*** 45 90 180 360

there is virtually no limit on belt length

w,,, mm < smallest pulley diameter
* a, b, c, d have no Standards significance. The letters
refer to Figure 1.7 and Figure 1.12.
** See Table 1 .I. The kIoh values given here are a
selection from those available. Values of 5, 10, 20, 33 and 1
40 N/mm may be obtained from a range of manufacturers.
*** Minimum pulley diameters vary with belt thickness,
H. N can take a wide range of values for any klyo, as the
ratio of friction material to tension member thickness
varies with application. dm,, and D,, ,~* values given here
are smallest values.
0.1
100 1000 10,000
Fastest pulley rev/rnin
Figure 1.7 Power rating of flat belts with
polyamide cores
B1.5