基于Nastran的十字轴万向节有限元分析

Finite element analysis of cross axle axis universal joint based on the Nastran

利用Nastran软件和有限元分析方法,对十字轴万向节进行可靠性分析,计算结果能精确反映受力零件应力集中部位及各部位的应力值:万向节叉的应力集中现象出现在万向节叉轴的根部周围,十字轴的应力集中现象出现在十字轴轴径有落差和两轴相贯的地方.通过工作应力值与材料许用应力值的比较,对零件结构进行改进:在非应力集中且应力值较小处削减材料以节省成本,在万向节叉根部和十字轴轴颈落差处做圆弧处理,可有效降低应力集中,提高零件的可靠性.

The Nastran and finite element analysis method was used for the reliability analysis of the crossaxis joints. The results can accurately reflect the stress concentration locations and the stress values. The stress concentration of the universal yoke appears in the root area of the yoke axis, and the stress concentration of cross-axis appears in the location where there is displacement between the two axes and the intersecting area. By comparison of the working stress and allowable stress values, the part structure can be improved： at the locations of non-stress concentration and stress reduction the materials can be reduced to save batch production costs, and at the roots and yokes cross location arc treatment can be made, which obviously reduce the stress concentration, thereby enhance the reliability of the parts.