Linear units with spindle drive LES 4, 5, 6
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April 2019
Mounting of belt drive module on LES4
– LES5 – LES6
The above diagram shows mounting of a belt drive module. The belt pulleys must have the same
spacing as the toothed belts. The two shaft ends and the belt pulleys should be free of burrs, rust and
dirt. We recommend force-fit connections using clamping bushes as shaft-hub connections.
The shaft ends must be aligned before mounting the toothed belt and belt pulleys.
The toothed belt must be mounted by hand without using force. In addition, the distance between the
axles must be reduced, using flanged discs, and the two belt pulleys mounted together. On no account
must the toothed belt be mounted onto the belt pulleys using force or mounting levers, since this can
cause damage to the belt which is not often visible.
The initial tension of the belt depends on the power to be transmitted and the drive properties. Howev-
er, because the power transmission of the toothed belt is positive and interlocked, little initial tension is
necessary.
We recommend using eccentric tension rollers to set the initial tension or correct the tolerances.
Too much initial tension produces higher running
noise, premature belt wear and can
even cause the shaft ends to break off.
Too little initial tension causes uneven running
and encourages the
belt teeth to skip.
We recommend the following for setting the initial tension:
Test force
F
16.5 N
Belt deflection d
3.5 mm
