Method of making camshaft

摘要

The method comprises the steps of providing a hollow tube, roll forming a number of axially spaced apart first zones on the hollow tube, each first zone having a number of circumferentially spaced apart reduced diameter segments. It then involves providing a number of cam elements, each cam element including an axial opening and then inserting the hollow tube into the cam elements each cam element being positioned about a first zone. The method then involves expanding the reduced diameter segments of the hollow tube into mechanical interference engagement with the cam elements. The areas of the hollow tube adjacent the first zones define larger diameter zones and the larger diameter zones do not expand during the step of expanding the reduced diameter zones.