Operating Instructions
2K2100 with STW
Initial installation
3.2
Balancing
13
The hubs (2) come with a keyway (1) for
transmitting power from the motor shaft (3) as
standard.
There are two balancing types for the motor and
gearbox, irrespective of the balancing quality:
semi-key and full-key.
It must be ensured that the hub is balanced in the
same way as the motor.
This is why it is very important to indicate the
motor data, dimensions and balancing type when
ordering.
Motor output shafts with standard fitted key in
accordance with EN 50347: 2001
Gearbox
type
Shaft
diameter,
length
Fitted
key
Fitted key
length
2K2100
Ø 75x140 mm
Ø 80x170 mm
Ø 90x170 mm
A20x12
A22x14
A25x14
125 mm
140 mm
140 mm
NOTE
In the case of motor shafts with open ends of the
keyway, the parallel key is to be glued into the
groove in order to avoid axial migration of the
parallel key and/or the hub.
023647
1
2
3
Semi-key balancing
Full-key balancing
3.2.1
Semi-key balancing
In semi-key balancing, the keyway is filled out
with a balance compensator corresponding to
approximately half a key, shape B by default. This
is based on the original key, shape, length and
position used by the motor manufacturer and is
defined as a counterweight. In semi-key balancing
– in contrast to full-key balancing – the joint
passes through a shared component. This means
imbalance can arise after assembly due to
tolerance factors.
As a result, it is recommended that rebalancing
should be performed after the joined parts have
been assembled.
3.2.2
Full-key balancing
In full-key balancing, the motor shaft is balanced
with a full key whereas the hub is not. The key,
shape, length and position are not important in
this case.
