When extremely stiff couplings are attached, the revolving radial
force may cause an impermissibly high load on the shaft and
bearing.
Bevel gear pinions or helical driv‐
ing pinions
Due to thermal expansion, the DE side of the drive shaft can be displaced by
up to 0.6 mm in relation to the motor housing. If helical driving pinions or
bevel gear pinions directly attached to the output shaft are used, this change
in position will lead to
●
a shift in the position of the axis, if the driving pinions are not axially
fixed on the machine side.
●
a thermally dependent component of the axial force, if the driving
pinions are axially fixed on the machine side. This causes the risk of
exceeding the maximum allowed axial force or of the backlash within the
gears increasing to an inadmissible degree.
●
damage to the NDE bearing by exceeding the maximum allowed axial
force.
It is recommended to use drive elements that have their own
bearings and are connected to the motor shaft via axially
compensating couplings.
KSM02 Motor-Integrated Servo Drives Operation in Potential‐
ly Explosive Atmospheres ATEX Directive 2014/34/EU
9/29
Operating instructions
R911379011_Edition 02 Bosch Rexroth AG
