Hydraulic motors convert hydraulic energy (pressure, oil flow) into mechanical energy (torque, revolutions). In the case of orbital motors, this conversion is made by the drive component (orbital unit): an external stator with internal toothing and a rotor (with planetary motion) of suitable profile. Our orbital motors have fixed displacement.
There are two types of gearing: the BGM, BG, and BH have gears with matching profiles (Gerotor gear set: fig. 1 a-b), whereas the BR, BS, ARS, ARF, HR and HT have rollers between the two gears (Geroller gear set: fig. 1 c-d-e).