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当前,国外柴油机进一步向高转速、高负荷方向发展,最高的燃气爆发压力可达150公斤/厘米~2;平均有效压力达到21公斤/厘米~2;活塞的平均速度已达14米/秒;同时,对于柴油机运转可靠性及寿命要求也不断提高。为此,一些国家对活塞的材质、结构进行了一系列的研究和改进。 一、活塞材料的发展 活塞材料是研究活塞的一个重要内容。随着发动机强化程度不断提高,各国已愈来愈多地采用过共晶硅铝合金,含硅量为17～26％不等。如日本的CHS-3含硅为22～24％,苏联的AЛ26含硅为20～22％。过共
At present, the foreign diesel engines are further developed to high speed and high load. The highest gas explosion pressure can reach 150 kg / cm ~ 2; the average effective pressure reaches 21 kg / cm ~ 2; the average piston speed has reached 14 m / At the same time, the reliability and life expectancy of diesel engines are also constantly increasing. To this end, some countries made a series of researches and improvements on the material and structure of the piston. First, the development of the piston material Piston material is an important part of the study. With the increasing degree of engine reinforcement, countries have increasingly adopted eutectic silicon aluminum alloy, silicon content of 17 ~ 26% range. Such as Japan, CHS-3 containing silicon is 22 to 24%, the Soviet Union ABS26 silicon content of 20 to 22%. Overcoach