HBK U9C Montageanleitung Seite 21

2. Distance between knuckle eye and shaft bearing
The shaft support must allow for suitable play between the knuckle eye and the shaft
bearing.
CAUTION
If there is too much distance between the knuckle eye and the shaft bearing, this generates
bending moments in the shaft, causing it to deform.
This deformations put strain on points of the edges of the inner bearing shell, which can
cause the knuckle eye or shaft to suffer damage or break.
Select the play as recommended in the mounting instructions.
To determine the play between the knuckle eye and the shaft bearing, you can apply the
following rule of thumb:
Shaft diameter
<30 mm
Tab. 7.3 Play between knuckle eye and shaft bearing
Based on this, recommendations for the play between the knuckle eye and shaft bearing
are as follows:
Knuckle eye
1-Z8/100kg/ZGW
1-U9/20kg/ZGWR
1-U9a/50kg/ZGW
Tab. 7.4 Recommendations for play between knuckle eye and shaft bearing
U9C
MECHANICAL INSTALLATION
Play between knuckle eye and bearing
1/10 of the nominal diameter
Play between knuckle eye and shaft bearing
0.5 mm
1 mm
1.6 mm
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