Development of anti-corrosive and wear-proof piston-pin bushing material for heavy duty diesel engines

Recent diesel engines require higher performance and longer Life. Due to hi gh cylinder pressure, the operating load and temperature of piston pin bush ings has become severe. Therefore, high load carrying capacity, wear resist ance and corrosion resistance are required for piston pin bushings. To impr ove the corrosion resistance, we study the effects of adding elements to co pper alloy. We find that the addition of nickel to copper reduces the sulfi de corrosion of copper alloys. We also attempt to improve wear resistance b y adding hard particles into the copper alloys. The primary goal of the stu dy is to determine the effects of hard particles on wear resistance and the machining process. The successful result is an improvement in wear resista nce without further complicating the machining process. Based on this study , a new material for piston pin bushings has been developed, effectively im proving the bushing's corrosion and wear resistance in heavy duty diesel en gines.