Patent ID: 8402650

Claim:
Method for producing a built-up cam shaft in order to control valves of internal combustion engines having a shaft and at least one functional component which is produced in a separate manufacturing process and has an internal orifice to receive the shaft, wherein, at least in a region in which the functional component is to be attached, the shaft is widened at least in portions by material deformation of the outer periphery of the shaft by means of knurling, wherein raised areas distributed over the outer periphery of the shaft and extending in the longitudinal direction of the shaft axis are formed on the outer surface of the shaft, and wherein the functional component with its orifice is threaded onto the shaft and is connected to the shaft by being pushed onto the raised areas, wherein the orifice in the functional component is substantially round to receive the shaft, and insertion means are provided on the raised areas and/or at the orifice in the functional component, which allow the functional component to be pushed onto the raised areas substantially without shavings being produced, wherein substantially by deformation of the material of the functional component in the region of the orifice in the functional component the raised areas partially dig into this orifice and in so doing connect the functional component to the shaft in a non-positive and positive manner, wherein the functional component is widened by the joining process by no more than 0-2 mm in relation to the starting diameter of the outer contour of the non-joined function component.