The difference between flexible shaft couplings and rigid shaft couplings is not just in terminology but in torque absorption.
Shaft alignment is essential to prevent unnecessary wear and damage to pumps, motors, gears, seals, bearings and other components of a transmission. Improper alignment can lead to premature failure, downtime and additional costs.
Axial misalignment can be caused by differing tolerances or by thermal expansion of the shafts and components with which the shafts contact.
Radial misalignment can be defined as a measure of the offset distance between the centerlines of the drive and driven shafts. This type of misalignment causes the highest stresses due to the forces involved.
Angular misalignment can be defined as a measure of the angle between the centerlines of the drive and driven shafts, where these centerlines would intersect approximately halfway between the ends of the shafts.
Shaft misalignment is the result of movement during assembly and operation and when machines built with two radial bearings each are rigidly coupled resulting in the application of high loads
to the bearings. Elastic deformation of the base frame, foundations and machine casing will lead to
misalignment of the shaft which cannot be avoided even by precise initial alignment. Also, since individual transmission components heat up differently during operation, thermal expansion of machine housings causes shaft misalignment. Misaligned drives are often the cause of failed seals, bearings or couplings. Alignment must be carried out by specialized personnel in accordance with the instructions for use.
Flexible shaft couplings are designed to mitigate the effects of mechanical misalignment of the power transmission shaft. Rigid shaft couplings are able to transmit higher torque than flexible shaft couplings due to the damping effect of the flexible coupling elements absorbing some of the torque when using shaft couplings. flexible shafts.