CHIORINO
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Endless belts tolerances
Width [mm] | < 60 | ± 1 |
60 ÷ 150 | ± 1,5 | |
> 150 | ± 2 |
Configuration of the pulleys
To assist tracking of the belt it is advisable to crown the drive pulley. When considering drives with minimal difference between
the pulleys’ diameters or with vertical or semi-crossed drives, it is advisable to also crown the smaller pulley, decreasing the h
value by half. With multiple pulley drives, the pulleys to be crowned are only those touched by the same face of the belt. It is
important to crown the pulley (s) as shown in the figure below. Do not fit pointed or truncated cone-shaped pulleys. Materials
recommended: cast iron or steel with smooth surface finish. The dimension h is a value of the pulley diameter up to 400 mm
(see table 1). For ø ≥ 400 mm, h is a value of the diameter ø, as well as the face width b of the pulley (see table 2).
Usually the belt width recommended is as a minimum 10 mm narrower than the pulley face width.
TAB. 1
Dimensions for pulleys having diameter D from 40 to 355 mm (ISO R 22/DIN 111)
TAB. 2
Width b | ≤125 | 140 and 160 | 180 and 200 | 224 and 250 | 280 and 315 | 355 | ≥400 | |
Diameter D | Dimension h max | |||||||
400 | 1.0 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | |
459 | 1.0 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | |
500 | 1.0 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | |
560 | 1.0 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | |
630 | 1.0 | 1.5 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | |
710 | 1.0 | 1.5 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | |
800 | 1.0 | 1.5 | 2.0 | 2.5 | 2.5 | 2.5 | 2.5 | |
900 | 1.0 | 1.5 | 2.0 | 2.5 | 2.5 | 2.5 | 2.5 | |
1000 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.0 | 3.0 | |
1120 | 1.2 | 1.5 | 2.0 | 2.5 | 3.0 | 3.0 | 3.5 | |
1250 | 1.2 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | |
1400 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.0 | |
1600 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 5.0 | |
1800 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 5.0 | 5.0 | |
2000 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 5.0 | 6.0 | |
Dimensions for pulleys having diameter D from 400 to 2000 mm (ISO R 22 / DIN 111)
Diameter D | Dimension h max |
from 40 to 112 | 0,.3 |
125 and 140 | 0.4 |
160 and 180 | 0.5 |
200 and 224 | 0.6 |
250 and 280 | 0.8 |
315 and 355 | 1.0 |
b
h
D
Polyurethane 
round and V-belts
21
CHIORINO manufactures by extrusion both polyurethane round and V Section belts which are used in various markets for transmission of light duty drives, at medium low speeds
and conveying light loads.
Main characteristics: extremely good tensile strengths, elasticity and flexibility values; very high resistance to abrasion, tearing, grease and pure mineral oils, petrols and hydrolisis. The recommended working temperatures is between
–20 and +60 C degrees.
Round belting is now available in two versions:
- “RU HP” series in blue color with smooth
surface, complying to EU regulations EC 1935/2004,
EC 2023/2006, EU 10/2011 and FDA, 85 Sh.A hardness;
- “RU” series in green colour with rough surface, 92 Sh.A
hardness.
The V-belts are manufactured in a single range which has a
smooth surface, 92 Sh.A hardness, in bright green colour.