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9.11
Transmission definition
To prevent irregular radial loads on the shaft and the relative
bearing, follow these directions:
a) Use pulleys with V‑belts with the size of the groove
required/recommended by the manufacturer of belt used.
In the absence of directions, follow Fig. 8 and the table in
Fig. 9.
Break
corners
Single groove
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.
Multiple groove
Fig. 8
DIN symbol
symbol B.S./ISO
DIN symbol
symbol B.S./ISO
α = 34°
≈
1
α = 38°
30
XPB/SPB
XPC/SPC
SPB
SPC
17
22
B
C
b
14.0
w
18.9
19.5
c
8.0
e
23 ± 0.4
31 ± 0.5
f
14.5 ± 0.8
20.0 ± 1.0
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
19.0
26.3
27.3
12.0
31.5
> 315
> 315
± 30'
40
71
102
133
164
195
226
257
288
319
350
381
Fig. 9
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