一种跃度连续的配气凸轮型线研究  

Study of a Valve Train Cam Profile with Continuous Jerk

作　　者：赵海峰 魏明亮 ZHAO Haifeng;WEI Mingliang(State Key Laboratory of Intelligent Agricultural Power Equipment,Luoyang 471039,China;First Tractor Company Limited,Luoyang 471003,China)

机构地区：[1]智能农业动力装备全国重点实验室,河南洛阳471039 [2]第一拖拉机股份有限公司,河南洛阳471003

出　　处：《拖拉机与农用运输车》2024年第4期64-70,共7页Tractor & Farm Transporter

基　　金：国家重点研发计划项目(2022YFD2001204)。

摘　　要：针对内燃机配气凸轮无法在全工作段保持跃度连续的问题,提出一种新型的分段低次方组合式凸轮型线模型。通过对该凸轮型线模型运动规律的分析,得到了通过设计参数计算各段角度和表达式的方法,并对相关设计参数的约束条件进行了研究。基于该模型,对某内燃机进排气凸轮进行了设计,并与现有凸轮型线进行了对比。结果表明,该模型设计的凸轮型线在缓冲段、基本段和各段连接处都能保证跃度曲线连续;在指定的设计参数下,该模型不需要进行优化和调整,就可以快速得到唯一确定的凸轮型线,还可以自动调整分段数,并保证得到最大速度和最大丰满系数;通过与类似型线比较得知,该凸轮型线在相同限值的情况下,丰满系数>1%~12%,最大速度>1%~13.5%,最大跳度<20%~70%。In order to address the problem that the valve cam of internal combustion engine could not maintain the continuity of jerk in the whole working sections,a new segmented low-order combined cam profile model was proposed.Through analyzing the motion law of the cam profile model,a method of calculating the angle and expression of each segment via design parameters was obtained,and the constraint conditions of the relevant design parameters were studied.Based on this model,the intake and exhaust cams of an internal combustion engine were designed and were compared with the existing cam profiles.The findings suggest that the cam profile designed by this model can guarantee the continuity of jerk curve at the ramp section,the basic section and the connection of each section.Under the specified design parameters,this model can quickly obtain a uniquely determined cam profile,the number of segments can be automatically adjusted without optimization and adjustment,ensuring maximum velocity and maximum fullness coefficient.Compared with similar profiles,it is found that the fullness coefficient of this cam profile is 1%~12%larger,the maximum velocity is 1%~13.5%larger,and the maximum derivative of jerk is 20%~70%smaller under the same limits.

关 键 词：内燃机 配气机构 凸轮型线 跃度连续 

分 类 号：TH112.2[机械工程—机械设计及理论]