Driveshaft with additional masses

A one piece driveshaft formed by deformation comprising:

• a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft;
• and
• at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore, wherein said at least one mass element has a variable wall thickness.

A one piece driveshaft formed by deformation comprising:

• a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft;
• and
• at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of central portion central bore, wherein a plurality of additional mass elements are positioned on said shaft.