Face Gears drives Advantages :
The possibility to split torque in a gear transmission, particularly in a helicopter transmission. Application of spiral bevel gears for this purpose is less favorable.
More favorable conditions of transfer of meshing when one pair of teeth is changed for the neighboring one. Due to misalignment, the transfer of meshing in other types of gear drives is accompanied by transmission errors that cause vibration and noise. The advantage of face gear drives is that misalignment does not cause transmission error at the transfer of meshing, because the involute pinion tooth surface is equidistant. However, errors of alignment in a face gear drive may cause a shift in the bearing contact, therefore localization and stabilization of the bearing contact become necessary.