33
6.6.6 GENERAL RULE FOR CALCULATING THE TIGHTNESS OF BELT TYPES
SPB / 5V / 15N / XPB / 5VX
For better understanding of general rule for calculating the tightness of belt see Fig.Errore. L'origine riferi-
mento non è stata trovata..
100
C
K
E
•
≅
E = Flexure (mm) of a section of belt (C) subjected to a force (F) equivalent to 75 N (~7.5 kg)
applied to the center of the section (C/2).
K = Flexure (mm) of a 100 mm (4") section of belt subjected to a force of 75 N (~7.5 kg) applied
to the center of the section.
Diameter of the smallest belt pulley (mm)
Values of K (mm)
80<160
3
160<224
2.55
224<355
2.22
>355
2.1
C = Longer section of belt of transmission (mm).
C/2 = The middle of the longer belt of transmission where the force (F) must be applied (mm).
F = Force applied to check the tension of the belts, equivalent to 75 N (~7.5 kg).
The table below reports the right values for the finishing mowers:
Values of general rule parameters (mm)
Parameters
Machine Model
SM 120
SM 150
SM 180
K
3
3
3
C
422
522
622
E
12.5
15.5
18.5
ADJUSTMENT, PREPARATION AND USE
