Patent ID: 8157025

Claim:
A drive connection for a down hole drilling motor, comprising: a tubular outer housing having a motor end and a bit end, the tubular outer housing defining an interior bore; an adjustable angular offset being provided toward the bit end of the tubular outer housing; an inner mandrel positioned within the interior bore of the outer housing, the inner mandrel being comprised of: a motor end section; a bit end section; and an intermediate section connecting the motor end section and the bit end section, the intermediate section having an upper articulating engagement that is coupled to rotate with the motor end section and a lower articulating engagement that is coupled to rotate with the bit end section, such that the motor end section, intermediate section and bit end section rotate together with the upper articulating engagement and the lower articulating engagement accommodating eccentric rotation caused by the angular offset; at least one continuous drilling fluids passage extending from the motor end of the tubular outer housing to the bit end section of the inner mandrel; and bearings that rotatably support the inner mandrel within the tubular outer housing, the bearings being disposed in a sealed lubrication chamber that traverses the adjustable angular offset.