Roller Mils are directly driven bevel-wheel planetary gears or bevel cylindrical gear units.
The gear unit represents an almost integral component of the mill. The output flange of the gear unit is rigidly connected with the grinding table. In addition to transmitting the torque ,the gear unit also has capability  to take up the reaction forces from the the griding force of the mil’s rollers.
Hydro dynamically or hydrostatically lubricated thrust bearing being mounted in the upper housing parts of the gear unit absorb the grinding force which is then transferred though the housing into mill’s foundation .
This growing number of roller mills in operation as well as the increasing specific need and demand of gear transmission feature .