Slow Internal Gear Motors - Etesia HYDRO 124D Technical Training Manual

The hydraulic motor transforms hydraulic energy into rotary mechanical energy (rotational
movement). It is characterised by its cubic capacity (in cm3). The hydraulic motor is equipped
with a drain to evacuate the external leakage. Because of the way it is built, the internal pinion
must turn 6 times for one turn of the wheel. This reduction leads to :
- Slow rotation of the wheel
- A high torque
Indeed, the torque is proportionally inverse to the rotational speed.
Rotational speed of
internal pinion
Torque input

3.3) Slow internal gear motors

WHEEL MOTOR
WHEEL MOTOR
Output speed = Rotational
speed of internal pinion / 6
Torque output =
6 x torque input
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