Introduction

The transmission assembly, which is attached to the lower end of the rotor, transmits the rotation and torque generated by the power section to the bearing and drive shaft. It also compensates for the eccentric movement of the rotor's nutation and absorbs its downthrust.

Rotation is transmitted through the transmisson shaft, which is fitted with a universal joint at each end to absorb the eccentric motion of the rotor. Both universal joints are packed with grease and sealed to extend their life.