Patent ID: 7588006

Claim:
A camshaft for automotive engines, having contra-rotating cams rotating about the camshaft axis over limited circumferential angles, wherein an inside shaft ( 2 ) and an outside shaft ( 1 ) are arranged concentrically one inside the other, the contra-rotating cams ( 3 , 4 ) consist of first and second cams, the first cam ( 4 ) of which is fixedly joined to the inside shaft ( 2 ) and the second cam ( 3 ) of which is fixedly attached to the outside shaft ( 1 ), the outside shaft ( 1 ) and the inside shaft ( 2 ) are mounted with respect to one another comprising the features the inside shaft ( 2 ) has a greater length than the outside shaft ( 1 ), the axial attachment between the outside shaft ( 1 ) and the inside shaft ( 2 ) provided via first add-on elements ( 6 , 6 ′) that are fixedly joined to the ends of the inside shaft ( 2 ), the first add-on elements ( 6 , 6 ′) have cylindrical bearing face areas ( 8 , 9 ), the cylindrical bearing face areas ( 8 , 9 ) of the first add-on elements ( 6 , 6 ′) are designed as bearing faces ( 8 , 9 ) for the bearing of the inside shaft ( 2 ) with respect to the outside shaft ( 1 ).