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Bosch Rexroth AG
Operating conditions and application notes
10.9
Attachment of drive elements
Ex protection
Attachment of transmissions on
motors
Over-determined arrangement
Couplings
Bevel pinion or helical drive pin‐
CAUTION
Pending liquids (e.g. cooling lubricants, gearbox oil, etc.) at the drive shaft
are inadmissible.
When installing gearboxes please use gearboxes with closed (oil-proof) lubri‐
cation system only. Gearbox oil should not be in permanent contact with the
shaft sealing ring of the motors.
For any type of attachment of drive elements to the output shaft, such as:
●
Couplings
●
Pinions
the following instructions must absolutely be observed.
When mounting drive elements, check their suitability and keep the ATEX di‐
rectives.
Notes
chapter 8.1 "Transmission" on page
In general, an over-determined arrangement must be avoided when mounting
drive elements. The indispensable existing tolerances lead to additional
forces on the bearing of the motor shaft and, if necessary, to a significantly
reduced bearing life.
If an over-determined arrangement cannot be avoided, please
contact Bosch Rexroth.
The machine design and the attachment elements used must be carefully
matched to the motor type so that the load limits of shaft and bearing are not
exceeded.
When mounting extremely rigid couplings, an unacceptably high
load on the shaft and bearing can occur due to a radial force
which constantly changes the angular position.
Due to thermal effects, the flange end of the output shaft can shift by up to
ions
0.6 mm in relation to the motor housing. When using helical drive pinions or
bevel gear pinions mounted directly on the output shaft, this change in length
leads 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 pin‐
ions are axially fixed on the machine side. There is a risk that the maxi‐
mum permissible axial force will be exceeded or that the backlash within
the gearing will increase excessively.
●
Damage to the B-side motor fixed bearing due to exceeding the maxi‐
mum permissible axial force.
Preferably use self-supported drive elements which are connec‐
ted to the motor shaft via axially compensating couplings!
DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P
Synchronous Servomotors MSK For Potentially Explosive Areas
Motor damage by intrusion of liquid!
107.
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