Nicotra Gebhardt RZR Betriebsanleitung Seite 56

10.5.1 Tensioning rules for V-belt drives
Fig. 10-3: V-belt drive
10.5.2 Tensioning rules for flat belts
Fig. 10-4: Flat belt drive
10.5.3 Tensioning rules for V-belt and flat belt drive
Fig. 10-5: Belt drive
10.5.4 Belt changing
10.5.5 Pulley changing
EN-24/32
L = Span between shaft centres
b = Belt deflection under test force F
F = Test force in N from the
p
 The correct tensioning for a belt is achieved if the individual test force F
produces a belt deflection b of 16 mm per 1000 mm of span.
L = Measurement mark spacing on un-tensioned flat belt
Mu
L = Measurement mark spacing on correctly tensioned belt
Mg
*
= Increase in mm from the manufacturer documentation
 The correct belt tensioning has been achieved when the measurement
has increased by *. The adjustment should take place
mark spacing L
Mu
in two stages with a time period of some hours in between to avoid
overloading the bearings.
The check of the belt tension is made through observation of the static belt
frequency. For this purpose the flat or V-belt is hit and vibrating at resonance
frequency. An electronically measuring device - the so-called Trummeter – will
relate this to the tension force. The oscillation in Hz has to correspond to the
value indicated in the documentation/type plate.
The measuring point is places in the centre (1) of the belt, i.e. between
both pulleys.
 The centre distance should be reduced until the new belt/s can be easily
fitted by hand.
 The tensioning of the belt follows in accordance to the respective
tensioning rules.
Observe the running-in phase!
To release the pulley wheel:
1. Unscrew the bolts (3).
2. Tighten the socket head cap screw in the threaded hole (4).
3. Press the clamping bush out of the tapered hole.
4. The pulley wheel can now be easily slid of the shaft.
Fig. 10-6 to release:
To fix the pulley :
1. Pull the pulley wheel and the clamping bush together by means of the
socket head cap screw (3).
2. Motor pulley and fan pulley to be exactly in line
3. Belt tension to be set according to instructions
Fig. 10-7: Fixing
p
English
p