摘要
为实现发动机小型化与轻量化目的,将自然吸气4缸汽油机改造成3缸增压发动机,应用曲轴平衡理论及经验公式对3缸发动机曲轴平衡块的布置方式及大小进行设计,并对曲轴的综合扭振进行评估。研究结果表明:3缸发动机4平衡块技术可以满足小型化增压发动机平衡的目的;平衡块偏心30°可以使得力偶最小,减小曲轴扰动;新设计的曲轴力是平衡的,惯性力矩水平方向(往复惯性力矩)最大值为173 N·m;新设计的曲轴强迫振动中综合振幅最大值为0.3°,各谐次振幅最大值为0.075°,均满足曲轴扭振NVH要求。
To achieve the engine downsizing and lightweight, a 4-cylinder naturally aspirated gasoline engine was modified to be a 3-eylimler turbo engine, the balancing theory and empirical formula was applied to design the layout of 3-eylinder engine balance weight, and the comprehensive torsional vibration of crankshaft was evaluated. The results show that a 3-cylinder engine with 4 balance weights can meet the balancing requirements for small-sized turbo engine. 30° eccentricity of balance weight can make force couple reach minimum, reducing crankshaft disturbance. The applied forces of newly designed crankshaft are balanced, the maximum moment of inertia in the horizontal direction is 173 Nm; the maximum comprehensive amplitude of the newly designed erankshaft is 0.3 deg, the maximum amplitude of per degree is 0.075 deg, these values all satisfy the requirements of NVH.
出处
《汽车工程师》
2015年第7期47-50,共4页
Automotive Engineer
关键词
汽油机
小型化
曲轴平衡
平衡块
Gasoline engine
Downsizing
Crankshaft balancing
Balance weight
