GEBAUTE NOCKENWELLE

摘要

An assembled camshaft comprises a one-piece or assembled tubular shaft and elements in the form of cams or bearing shells held principally by friction under constant pre-tension as a result of radial hydraulic expansion of the tubular shaft. The tubular shaft is made of a material with a yield strength of approximately 300 N/mm<2> and a structure that is stable up to a temperature of at least 600 DEG C. The elements may be made of a hardenable casting material with a yield strength greater than or equal to 500 N/mm<2> and a minimum elongation of 1 to 2%. After joining the tubular shaft and the elements, the entire camshaft is thermochemically treated at a temperature of approximately 600 DEG C, e.g. bath-nitrided, soft nitrided, bonderized or treated with boron, giving improved wear resistance of the cam surface. The cams may be subjected to an induction or remelting hardening process before location on the tubular shaft.