Pratissoli KF Serie Manual De Uso página 31

Dimensions (in mm)
Belt section as per
DIN 7753 part 1 and B.S. 3790
Belt section as per
DIN 2215 and B.S. 3790
Pitch width
Increased grooving width b
Distance between grooving
Increased grooving depth
α 34° by primitive diameter
narrow-section V-belts
38°
DIN 7753 part 1
α 34° by primitive diameter
classic section V-belts
38°
DIN 2215
Tolerance for α = 34°-38°
Pulleys for b2 by grooving number z
b2 = (z-1) e + 2 f
Minimum pulley diameter must be respected.
Do not use laminated V-belts.
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.
c) Pull the belts according to manufacturer instructions.
Excessive pulling can cause reduced bearing life and wear
out the pulley prematurely. Pulling depends on different
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.
DIN symbol
symbol B.S./ISO
DIN symbol
symbol B.S./ISO
α = 34°
≈
α = 38°
1
f ) Take care of the alignment of the driving pulley and driven
pulley grooves.
31
XPB/SPB XPC/SPC
SPB SPC
17 22
B C
b 14.0
w
18.9
19.5
c 8.0
and 23 ± 0.4
f 14.5 ± 0.8
t 22.5
min
d from 140 to 190 from 224 to 315
w
> 190
d from 112 to 190 from 180 to 315
w
> 190
± 1°
1 29
2 52
3 75
4 98
5 121
6 144
7 167
8 190
9 213
10 236
11 259
12 282
Shaft
shoulder
(P.T.O.)
Fig. 10
19.0
26.3
27.3
12.0
31 ± 0.5
20.0 ± 1.0
31.5
> 315
> 315
± 30'
40
71
102
133
164
195
226
257
288
319
350
381
Fig. 9