１问题的提出 我公司生产的 ＺＬ４０／ ５０轮式装载机前、后车架的铰接结构如图１所示。其上、下铰接结构的区别在于前、后车架上的铰接部位轴向为浮动定位，下铰接部位轴向通过间隔套进行定位，因此装载机在工作状态下，下铰接销由于受力大，润滑条件差，轴向定位又受后车架 1 problem put forward I produced the ZL40 / 50 wheel loader front and rear frame hinge structure shown in Figure 1. The difference between the upper hinge structure and the lower hinge structure is that the hinge parts on the front and rear frames are axially positioned in a floating manner and the lower hinge parts are axially positioned in the spacer sleeve. Therefore, under the working state, the lower hinge pins are forced by the force , Poor lubrication conditions, axial positioning by the rear frame