对于一个四连杆机构的连杆曲线, 存在3个机构可以实现该曲线, 即著名的同源机构定律. 在研究连杆机构的连杆曲线的频谱成分与机构的尺寸关系时, 发现了与实现同一曲线形状有关的机构, 根据尺寸型和装配构型可分为3类, 进而得到6个连杆机构, 这6个连杆机构属于两种同源机构, 其中有4个机构有曲柄存在, 它们实现的轨迹形状相同, 且互相对称. 还给出了这6个机构尺寸型之间的相互关系及有曲柄存在的4个机构的尺寸计算方法, 通过尺寸型和装配构型来揭示同源机构之间的关系进而扩展了同源机构定律, 为机构的尺度综合提供更多的尺寸型选择方案. For a four-bar linkage curve, there are three mechanisms that can be used to implement this curve, known as the well-known law of same-source mechanisms. When studying the relationship between the spectral components of the linkage curve and the dimensions of the mechanism, To achieve the same shape of the curve of the body, according to the size and shape can be divided into three types of assembly configurations, and then get 6 linkages, the 6 linkages belong to two homologous agencies, of which there are four agencies exist crank , And they achieve the same trajectory shape and symmetry with each other.It also gives the relationship between these six mechanism size types and the calculation method of the size of the four mechanisms with crank existence The relationship between source agencies further expands the law of homology institutions and provides more size-based alternatives for the organization’s metrics.