Rotor and flexible drive shaft assembly

摘要

A rotor and flexible drive shaft assembly for a progressive cavity pump or motor in which the rotor 10 is provided with an end portion 12 and the drive shaft 20 is provided with a head portion 18. A transverse spirally wound sheet metal pin 24 is engaged in the first passage 16 in the end portion 12 and a second passage 22 in the head portion 18, a retaining sleeve 26 preventing the pin from falling out, the retaining sleeve itself being held in place by a circlip 32.