Most gearhead manufacturers
have a rigid connection between the motor shaft and the reducer.
Although on the surface this seems appropriate, it can actually
lead to performance and maintenance problems.
The typical gearhead design
has a single bearing supporting the input shaft. The sun gear
then centers itself between the planet gears when under load.
This is not possible, however, when the input shaft is rigidly
mounted to the motor.
In the event that there is
a small misalignment, due to tolerances in the flange adapters,
the sun gear is not allowed to find it's optimum position. This
results in more noise, inefficiency, and reduced capacity.
The ServoFoxx® design incorporates
a torsionally rigid, flexible bellow element that compensates
for any pilot error. The gearhead input shaft is supported by
two bearings, guaranteeing the optimum sun gear position, resulting
in maximum performance.
This design also accounts for
any thermal expansion of the motor shaft, and aids in disassembly
should a failure occur.
Follow these instructions when
- Measure dimension X (top of
coupling to top of adapter plate) using a depth gauge.
- Add the coupling pretensioning
value to dimension X. The result is dimension Y.
- Position the coupling hub
or add a shim to the motor shaft to achieve Y.
- Tighten hub bolts using the
proper tightening torque.
The most favorable mounting
position for optimum lubrication is with all shafts in a horizontal
plane. For the FS and SKP series it is also acceptable to mount
the input shaft vertically down.
Whenever shafts require vertical
mounting, especially in the series PL2FS and series PSK2FS, special
lubrication considerations will most likely be necessary. Consult
your DieQua representative for the proper lubrication option
When connecting the gearhead
output shaft to the driven load, alignment is a critical concern.
It is best to use a flexible coupling to compensate for any shaft
misalignment. DieQua offers a wide range of highly rigid bellow
coupling designs to achieve a zero backlash connection.
When selecting a hollow bore
shaft mount gearhead, great care should be taken if the gearhead
is to be rigidly mounted. Precise alignment is necessary to avoid
premature bearing wear.
When transmitting motion via
a belt or gear, the effective radial load must be calculated.
The catalog radial load capacities are based on continuous speed.
Cyclic applications may allow for higher or lower radial load
capacities depending on the cycle. Consult your DieQua representative
in these instances.