SIEMENS
10/50
Siemens MD 50.1 · 2015
Gearbox options
Reduced-backlash version
10
■
Overview
Gearboxes with low torsional backlash are required for high-pre-
cision positioning tasks. A minimal torsional backlash also has a
favorable effect on torque spikes during startup and on load
switching in the drive train.
The torsional backlash of a geared motor depends on several
factors. The total torsional backlash is primarily influenced by
circumferential backlash, bearing clearance and shaft-hub con-
nections. In addition to the standard versions, reduced-backlash
versions of SIMOGEAR geared motors are also available.
Thanks to the overall concept and the plug-on pinion system,
motors with lower torsional backlash values can be supplied.
To ensure that the entire driven machine can be designed with
minimum possible backlash, it is advisable to select the solution
with integral motor mounting (without adapter), output shafts
with shrink disk connection or with smooth shafts (without feather
key). In this case, only backlash-free power transmission ele-
ments should be used.
The specified torsional backlash in minutes of the angle [’] is
based on the maximum rotation angle of the output shaft
(no load, max. 1 % of rated output torque) with stationary input
shaft.
For the exact values, refer to the torque tables. If no values are
specified in the tables, this means that a reduced-backlash ver-
sion is not available for the specific version.
The dimensions of the reduced-backlash gearboxes are identi-
cal to those of the standard versions.
The following gearboxes are available in reduced-backlash versions
Order code:
Reduced-backlash version
G99
Gearbox
Size
09
19
29
39
49
59
69
79
89
Helical gearboxes Z and D
-
✓
✓
✓
✓
✓
✓
✓
✓
Parallel shaft gearboxes F
-
-
✓
✓
✓
-
✓
✓
✓
Bevel gearboxes B
-
✓
✓
✓
✓
-
-
-
-
Bevel gearboxes K
-
-
✓
✓
✓
-
✓
✓
✓
Helical worm gearboxes C
-
-
-
-
-
-
-
-
-
Worm gearboxes S
-
-
-
-
-
-
-
-
-
© Siemens AG 2015