Bosch Rexroth GTM Series, Project Planning Manual

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10-4
Assembly Planetary Gearboxes
DOK-GEAR**-GTM********-PR01-EN-P
3. Connect the motor to the gearbox. Insert the motor shaft into the
gearbox coupling until the gearbox`s connecting flange and the motor
face are fully in contact. It should be possible to accomplish this
without excessive force. The gearbox is equipped with an integrated
thermal length compensation to compensate for the thermal
expansion of the motor shaft. When joining the parts together, the
axial force exerted onto the compression coupling must not exceed
the value specified in the table below (see Fig. 10-4). The force is
exceeded, the compensation for heat expansion of the motor shaft
cannot be ensured. This can lead to damage of the motor and/or the
gearbox.
Gearbox
type
Clamping bolt
EN ISO 4762
Wrench size Tightening
torque
Max. axial
force on
compression
coupling
[mm] [Nm] [N]
GTM060
M5-8.8 4 5,5 60
GTM075
M5-12.9 4 9,5 85
GTM100
M6-12.9 5 16 115
GTM140
M8-12.9 6 40 130
GTM180 M10-12.9 8 79 170
GTM240 M16-12.9 14 330 220
Fig. 10-4: Axial force
GG000005v01_en.EPS
Fig. 10-5: Insert the motor shaft into the gearbox
CAUTION
To negate the weight of the motor and/or the gearbox
itself, we recommend to perform this mounting in the
vertical axis.