When transmitting torque from a drive shaft to a driven shaft, flexible couplings:
absorb and dampen irregularities in the torque
distribute peak loads
Allow misalignments and offsets between the shafts
Permit some disortions in the mounting beds
Avoid the unwelcome constraints that may occur if a rigid coupling were fitted in the same conditions.
Allow a highter constructions, with wider tolerances, and lower cost.
