Reduced Friction in Camshafts
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More than ever before, constantly increasing requirements on the combustion engine are making it necessary to reduce its friction losses. Valve train friction amounts to around 15 % of total engine friction. Economically interesting potential for a significant reduction exists here. ThyssenKrupp has systematically studied new approaches based on further developed manufacturing and coating processes on the cams and the camshaft bearings. In the future, specially developed test rigs will enable a quick, objective comparison for various engine types.
Camshafts usually have two areas of contact with their environment which are susceptible to friction: the camshaft bearings and the cams. Friction can be reduced at both contacts by specifically machining the ground, standard surface.
Cam friction contact is preferably optimized if this involves sliding contact — e.g. bucket tappets. Coating this contact partner, especially with layers consisting of amorphous carbon (diamond like carbon, DLC)...