Interpump 71 Series - Page 12

ENGLISH
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Dimensions (inmm)
Belt section as per DIN symbol
DIN 7753 part 1 and B.S. 3790 symbol B.S./ISO
Belt section as per DIN symbol
DIN 2215 and B.S. 3790 symbol B.S./ISO
XPB/SPB
SPB
17
B
XPC/SPC
SPC
22
C
Pitch width b
w
14.0 19.0
Increased grooving width b
1
≈
α = 34° 18.9 26.3
α = 38° 19.5 27.3
c 8.0 12.0
Distance between grooving e 23 ± 0.4 31 ± 0.5
f 14.5 ± 0.8 20.0 ± 1.0
Increased grooving depth t
min
22.5 31.5
α 34° by primitive diameter d
w
from 140 to 190 from 224 to 315
38°
narrow-section V-belts
DIN 7753 part 1
> 190 > 315
α 34° by primitive diameter d
w
from 112 to 190 from 180 to 315
38°
classic section V-belts
DIN 2215
> 190 > 315
Tolerance for α = 34°-38° ± 1° ± 30’
Pulleys for b2 by grooving number z
b2 = (z-1) e + 2 f
1 29 40
2 52 71
3 75 102
4 98 133
5 121 164
6 144 195
7 167 226
8 190 257
9 213 288
10 236 319
11 259 350
12 282 381
Minimum pulley diameter must be respected.
Do not use laminated V-belts. Fig.9
b) Use high performance belts – for example XPB instead of
SPB – as a lower quantity of belts for the same transmitted
power may be necessary and a consequent shorter
resulting distance compared to the shaft shoulder (P.T.O)
“a“ of Fig.10.
Shaft
shoulder
(P.T.O.)
Fig.10
c) Pull the belts according to manufacturer instructions.
Excessive pulling can cause reduced bearing life and wear
out the pulley prematurely. Pulling depends on dierent
variables as indicated in par.9.12.
d) Belt length has a natural tolerance ≥ ± 0.75%. For this
reason, the 2 belts must be purchased as a pair.
e) Follow the direction of the belt pull as shown in Fig.9 for
other needs, contact our Technical or Customer Service
Departments.
f) Take care of the alignment of the driving pulley and driven
pulley grooves.