双工作行程心形曲柄导杆机构  

Cardioid crank guide-bar mechanism with double stroke

作　　者：韩继光 韩昊桐 何贞志 HAN Ji-guang;HAN Hao-tong;HE Zhen-zhi(School of Mechanical&Electrical Engineering,Jiangsu Normal University,Xuzhou 221116;Xuzhou Testing and Identification Center,Jiangsu Huai Gong Vehicle Testing Research Institute Co.,Ltd.,Xuzhou 221003)

机构地区：[1]江苏师范大学机电工程学院,江苏徐州221116 [2]江苏淮工车辆检测研究院有限公司徐州检测鉴定中心,江苏徐州221003

出　　处：《机械设计》2022年第7期84-89,共6页Journal of Machine Design

基　　金：国家自然科学基金资助项目(51075347)。

摘　　要：心形曲柄是能够生成心形线的行星机构,用心形曲柄替代导杆机构的驱动曲柄,相当于导杆机构具有一个变化的长度和速度、沿着心形线运动的曲柄,从而改变了导杆的运动特性。文中提出了具有双工作行程的心形曲柄导杆机构,进行了机构运动分析,给出了导杆的极限位置、摆角、最小长度和行程速度变化系数的计算方法,讨论了机构结构参数对机构运动性能的影响。利用导杆摆角比与中心距的弱相关特性,用最小二乘法进行了机构的设计公式拟合,得到了双工作行程心形曲柄导杆机构的设计方法。The cardioid crank,as a planet mechanism able to generate cardioid curves,replaces the guide-bar mechanism’s driven crank,and thus the guide-bar mechanism has a crank with varying length and speed,which moves along the cardioid line.As a result,the guide-bar’s kinematic characteristics has changed.In this article,a cardioid crank guide-bar mechanism with double stroke is presented.Then,the mechanism is subject to the motion analysis.Efforts are made to calculate the guide-bar’s limit position,swing angle,minimum length and coefficient of stroke-speed changes.The influence of the structure parameters on the mechanism’s motion performance is explored.Besides,the weak correlation between the guide-bar’s swing-angle ratio and center distance is adopted to fit the design formula with the help of the least-square method.Finally,the design method of the cardioid crank guide-bar mechanism with double stroke is worked out.

关 键 词：双工作行程 导杆机构 运动分析 机构综合 心形曲柄机构 

分 类 号：TH112[机械工程—机械设计及理论]