ENGLISH
25
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 different
variables as indicated in point. 9.11.
d) Belt length has a natural tolerance ≥ ± 0.75%. For this
reason, the 4 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.
