莱佩莱捷式行星齿轮机构自动变速器设计研究

Study on the Design of Lepelletier Planetary Gear Mechanism Automatic Transmission

通过对公开的莱佩莱捷式行星齿轮机构进行结构分析,提出基于杠杆法建立速度矢量图进行可行换挡序列搜索的优选方法。该方法将自动变速器行星齿轮机构的基本元件以及所有可能的换挡执行元件都转化为等效杠杆坐标系上的点,绘制出所有可能挡位的速度矢量图,并对挡位进行分类;根据变速器的换挡逻辑要求和换挡执行元件数量作为约束条件确定换挡序列,推导出各挡传动比;计算速度矢量图中各线段的比例以及行星齿轮机构有序杠杆图的特征参数,从而确定机构所有构件的属性;通过绘制平面图,检测配置换挡执行元件机构的平面性。利用该方法实现对6~10速莱佩莱捷式行星齿轮机构的优选。结果表明,6速的两个结构和8速的一个结构与公开的专利相同,验证了方法是正确可行的。

Based on the structural analysis of the existing Lepelletizer planetary gear mechanism (PGM), an optimal method for searching the feasible shifting sequence by establishing the velocity diagram based on the lever analogy is proposed.In this method,the basic links of PGM and all possible shifting elements are converted into points on the equivalent lever coordinate system,the velocity vector diagram of all possible speed ratios is drawn,and the shifts are classified.The shifting sequence is determined according to the shifting logic of transmission and the number of shifting elements as constraints,the transmission ratio of each shifting is deduced.The ratios of the each line segment in the velocity vector diagram and the characteristic parameters of the ordered lever diagram of PGM are calculated,so as to determine the attributes of all links of the transmission. The transmission which arranged with shifting elements is checked by the planar-graph.This method is used to optimize the 6~10 speed Lepelletier PGM.The results show that the two structures of 6-speed and one structure of 8-speed are the same as those of the patented ones,which proves that the method is correct and feasible.