Patent ID: 8900062

Claim:
A driveshaft for a downhole motor, the driveshaft having a longitudinal axis and comprising: a first end; a second end opposite the first end; wherein the first end has a radially outer surface including: a first connection lug; a second connection lug uniformly circumferentially-spaced from the first connection lug; a third connection lug; and a fourth connection lug uniformly circumferentially-spaced from the third connection lug wherein the first connection lug and the second connection lug each include a cylindrical surface concentrically disposed about a first pivot axis oriented orthogonal to the longitudinal axis; wherein the third connection lug and the fourth connection lug each include a pair of parallel planar side surfaces; and a first recess extending axially from the first end and including a spherical concave surface configured to receive and slidingly engage a thrust ball.