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1、前言 为内燃机生产的活塞是动力系中的主要件。由于要适应变化的运行工况,安全运行不发生拉毛、结构强度高、运行平稳、油耗低和使用寿命长等,常规的活塞设计以及常用的材料已不能适应了 2、柴油机活塞的负荷情况 在卡车发动机中最大的燃气压力已达到120—140巴和活塞速度达到32—40英尺/秒,但仍不是它的现在的极限值。支撑横剖面和活塞销座的足够的机械强度,抗燃烧室边缘的热疲劳、耐磨性、特别是顶环槽的耐磨性以及抗拉毛的性能是今天柴油机活塞必需具备的。 3、活塞材料
1, Foreword Pistons produced for internal combustion engines are the main components in the powertrain. As to adapt to changing operating conditions, safe operation does not occur hair, high structural strength, stable operation, low fuel consumption and long service life, the conventional piston design and commonly used materials have been unable to adapt 2, the load on the piston in the diesel engine The maximum gas pressure in truck engines has reached 120-140 bar and the piston speed reaches 32-40 ft / sec, but it is still not its current limit. The sufficient mechanical strength of the support cross-section and the piston pedestal, thermal fatigue against the edges of the combustion chamber, wear resistance, especially the wear resistance of the top ring groove and the resistance to napging, are required for today's diesel pistons. 3, the piston material