行星变速机构换挡变胞与其构态属性自动识别

Evolution and Intelligent Identification of Metamorphic Configuration Aiming at Planetary Shifting Mechanism

针对数学表征行星变速机构换挡变胞过程及自动识别各挡位构态属性较难的问题,首先,解析了行星变速机构变胞理论,基于机构转换法定义相对转速意义下行星排构件间运动副约束函数的转换规则,构建以约束函数为元素的行星变速机构构件和关联关系的邻接矩阵;然后,根据换挡逻辑分析了操纵离合器和制动器的换挡变胞过程,基于邻接矩阵分别推导这两种换挡构态演变的变胞方程,建立包含行星排空转和整体回转等特殊构态的判别准则,结合实例分析揭示换挡变胞机理;最后,通过建立相对转速方程和行星变速机构特性参数识别,结合行星变速机构等效拓扑模型的约束条件,提出了基于构态变胞方程的行星变速机构传动比和转矩自动建模和求解方法,实现了行星变速机构各挡位构态属性的自动识别。以某拖拉机行星变速器为例进行了分析,验证了该方法的可行性和有效性。

It is difficult to mathematically describe the metamorphic process of gear-shift and identify its own transmission characteristics of planetary shifting mechanism.Therefore,the metamorphic theory was interpreted aiming at planetary shifting mechanism firstly.Based on the mechanism conversion method,the constraint function,which described the dynamics traits of kinematic pair between two adjacent parts was transformed into the space of relevant revolving speed.And its transformation rule was defined.The adjacent matrixes of components and their each correlation was constructed aiming at planetary shifting mechanism,whose elements were constraint functions.And according to the operation logic rule of gear shift by operating clutch and brake,the metamorphic function of shifting configuration evolution was separately deduced based on configuration adjacent matrix.The principle of configuration evolution was revealed with an example to be analyzed.The identification formula of special configurations,including neutral position and direct position were established.After the construction of relative speed functions and the identification of characteristics parameters,the automatic identification method of system transmission ratio and torque function was presented based on configuration metamorphic function eventually.It was used to automatically analyze the transmission characteristics of planetary shifting mechanism.The application of this method wasdiscussed aiming at the planetary shifting mechanism of one tractor.It was indicated that this method was feasible and effective.And it supplied the theory references for computer innovative design of the vehicle power train.