摘要
在某下置式凸轮轴高速柴油机的基础上,采用多项动力、分段加速度及多项动力-分段加速度三种方法拟合非对称凸轮型线。通过双质量的运动学模型计算出凸轮型线的速度和位移曲线,并比较了丰满系数、跃度及凸轮挺柱间的最大接触应力特性,确定了型线优化的最终方案。在基于多自由度的动力学模型下,从气门落座力、凸轮挺柱接触应力、气门加速度、气门速度及位移等方面,比较原型线与优化型线的差异,结果证明优化后的凸轮型线在以上各个方面都得到改善。
Three profiles of unsymmetrical cam in the forms of polydyne （POL）, individual section acceleration（ISAC） and POL-ISAC curves were used in the valve cam design for a high speed diesel engine with side-mounted camshaft. Using two-mass kinetic models, displacement and speed curves of these profiles were calculated. Analyzing their fullness coefficient, jerk and max. contact stress between cam and tappet, the final optimized profile was determined. Based on the multi-freedom dynamic model, comparing with the original profile demonstrate the optimized profile has been improved in terms of impact force of valve on its seat, contact stress between cam and tappet, valve acceleration, valve speed and displacement, etc.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2010年第4期25-29,34,共6页
Chinese Internal Combustion Engine Engineering
关键词
内燃机
柴油机
多项动力
分段加速度
凸轮型线
运动学
动力学
IC engine
diesel engine
polydyne
individual section acceleration
cam profile
kinematics
dynamics
