2-45TDC Operating
Instructions
Maintenance
7
7.6 Tensioning the belts
The correct belt pre-tension is of great importance for the perfect
output transmission and for maintaining the normal service life of the
belts. Insufficient or excessive pre-tensioning frequently leads to
premature failure of the belts. Over-tensioning often causes bearing
defects in motors and bearing units.
Check the correct pre-tension in accordance with fig. 7.1 by pressing
down the belt. The distance the belt can be pressed down should be
5-7 mm at approx. 10 kg.
Fig. 7.1
7.7 Taper
locks
Taper locks are used to shrink-fit hubs on shafts. Mounting and
demounting only requires a screw driver DIN 911 (Allan key).
Tightening and loosening is effected with the same threaded pins or
screws.
Taper locks are cylindrical on the inside, tapered on the outside and
slit longitudinally. The smaller bushes 2 and 3 have in the large face
their cylindrical blind holes in parallel to the axis which, however, are
only placed half in the bush material. The other halves of these blind
holes are threaded and are placed inside the hub.
Threaded pins or screws are screwed to the stop in the boreholes
using an Allan key. When the screws are tightened further using a
certain amount of force the hub is drawn up to the tapered bush
which is pressed onto the shaft with great force.
