Abstract
Automotive engine valve train wear conditions have to be very rigorous owing to higher contact pressures, the presence of boundary lubrication, lower allowable wear limits and other factors. In an effort to develop higher wear-resistant materials to meet these requirements, analyses were made of the material properties and wear morphology of several kinds of wear-resistant materials, namely ferro-based sintered powder metals, alloyed cast irons and silicon nitride ceramics. These materials were evaluated in engine motoring tests as rocker arm cam followers mated with low alloy chilled cast iron camshafts and an examination was made of their wear-resistant properties. The results suggested that the wear mechanism was controlled by fatigue and ploughing wear. On the basis of this analysis, Nissan has developed cam and follower systems which combine chilled cast iron camshafts with rocker arm followers made of high wear-resistant materials.
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