Patent ID: 8920064

Claim:
A shaft assembly comprising: a first shaft having a plurality of first splines, wherein the first splines each have an end portion and a chamfer disposed on the end portion; and a second shaft having a central axis and a central bore and being coaxial with the first shaft and having a plurality of second splines arranged in the axial direction around the periphery of the central bore, the plurality of second splines each having a base portion and an end portion, wherein the end portion defines an inverted chamfer having an undercut base and a tip, and wherein the tip of the inverted chamfer projects from the undercut base of the inverted chamfer radially away from the second shaft and axially away from the base portion of the plurality of second splines, and wherein the undercut base of the inverted chamfer undercuts the tip of the inverted chamfer, and wherein the undercut base is arranged in the axial direction around the central bore such that the undercut bores of the plurality of second splines define a circumferential groove between the tips and the central bore and wherein the plurality of first splines engage with the plurality of second splines to couple the first shaft and the second shaft for common rotation.