Camshaft with variable valve duration

The invention relates to a camshaft for an internal combustion engine, comprising a hollow outer shaft (2) and a concentrically within the outer shaft (2) by an angle (α) rotatably arranged inner shaft (4) and a multi-part cam element (6) with a rotationally fixed manner on the arranged outer shaft (2) the first partial cam (61) is arranged and with a rotationally fixed to the inner shaft (4) connected to and rotatable on the outer shaft (2) second cam part (62). The two partial cams (61, 62) have different cam contours, whereby by relative rotation of the partial cams (61, 62) against each cooperating with a cam follower resultant cam contour of the cam member (6) for adjusting the variable valve duration is variable. According to the invention, the two partial cams (61, 62) to a different maximum lifting height (H