摘要
本文根据铰链四杆机构的运动特点，选出一个特殊的三角形，其一边长为变量。通过确定该变量的取值范围，得出铰链四杆机构的曲柄存在条件不等式。此法在铰链四杆机构的一般位置进行研究，较传统方法更具说服力，并且更简便。
According to the characteristics of the motion of hinged four-bar linkage mechanism,a special triangle is selected with the length of its one side as the variance. By determining its valuation range, the existence of a conditional inequality in the crank of the mechanism has been found. The method is studied in the general position of the mechanism,and is more convincing,more simple and convenient in use than the traditional methods.
