Stephenson-Ⅲ型球面六杆机构曲柄存在条件探究  

Detection of a Crank in Spherical Stephenson-Ⅲ Six-bar Mechanism

作　　者：孙艳[1] 杨随先[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2013年第S1期173-176,共4页Journal of Sichuan University (Engineering Science Edition)

摘　　要：将Stephenson-Ⅲ型球面六杆机构看作是由1个基础球面四杆机构和1个球面二杆组组成的多回路机构。该机构的曲柄存在条件将由其各回路特性共同决定。根据连杆机构的组成原理,运用球面三角学导出球面四杆机构曲柄存在条件,再结合机构的可装配条件,给出了Stephenson-Ⅲ型球面六杆机构曲柄存在条件。构建了机构3维仿真模型,用仿真分析方法验证了结果的正确性。It is a critical issue to identify the existence of a crank of a multiple loop mechanism,which is most fundamental and difficult problem in the process of mechanism analysis and synthesis.The identification of a crank in spherical Stephenson-III six-bar mechanism was investigated.The mechanism was divided into two units,a spherical four-bar linkage and a spherical two-bar.By means of spherical trigonometry,the discriminant for detection of a crank of spherical four-bar linkage was presented at first.After that,combining that discriminant with assembly condition,the conditions of crank existence of spherical Stephenson-III six-bar mechanism were derived out.Finally,two examples were employed to valid the discriminant presented.

关 键 词：Stephenson-Ⅲ型球面六杆机构 曲柄条件 球面三角学 球面四杆机构 可装配性 

分 类 号：TH112[机械工程—机械设计及理论]