Linear units with toothed belt drive: LEZ 1/LEZ 2/LEZ 3/LEZ 9
Assembly instructions
Page 31
4.2
Setting up and servicing the trolley
Step 1:
Setting up the eccentric rollers (a).
Turn the roller with an Allen key (4mm(c)) so that
the conical tracks on the steel shaft of the guide are
screwed down. Choose the torque for this so that
free play and easy running between the adjoining
rollers are guaranteed.
Step 2:
Tighten the hexagonal nut with a SW 13 (b) wrench.
Torque the hexagonal nut to 20 Nm. At the same
time, maintain the roller at the preset position with
an Allen key.
Check:
The trolley is set correctly if. when in motion, all
rollers are turning and the trolley can be moved with
ease. If the pre-stressing is too high, as a result of
engaging the rollers too tightly, the working life is
reduced.
Feature:
the trolley is diifficult to move and can be difficult to move on the guide rails.
4.3
Adjustingthebeltdrive
Toothed belt pretensioning
The toothed belt should be tensioned such that it is deflected on the half trunk length s/2 under the test
load F by d = s/50 from the straight line.
The test load is dependent on the drive output and the belt speed.
To adjust the prestressing, we recommend:
Toothedbeltunit
Test load F
LEZ 1
5N….10N
LEZ 2
10N….15N
LEZ 3
10N….15N
LEZ 9
5N….10N
Unnecessarily high prestressing reduces
the working life of the drive, increases
the load on the bearings and wear on the teeth as
well as tending to increase the noise level in op-
eration.
Too low a tension can lead to the belt
teeth not engaging perfectly in the
gearing and jumping out on overload.