Research on Dynamic Impact Force Calculation for Spline Coupling Teeth and Its Suppression

Abstract

Due to the high bearing capacity and good alignment advantagements, splines are widely used in various mechanical equipment. However, alternating stress can be easily observed in meshing of spline coupling, which leads to fatigue failure of spline pairs such as cracks. The underlying mechanism and suppression method of impact force of spline pair are seldom studied. In order to settle this problem, this paper proposed a new two-mass nonlinear impact dynamic model of spline pair, and studies the generation mechanism, influence law and suppression method of dynamic impact force of spline pair. Based on Hertzian contact theory, this paper establishes the calculation model of dynamic impact force of spline pair firstly, both the coupling relationship between pressure angle, backlash and eccentricity and impact force are taken into consideration. Then, the calculation and suppression method of impact force of spline pair are investigated and discussed. The results show that the impact force gradually increases with the growth of backlash and eccentricity, and local extremum appears. This paper presents a new model to study and suppress the dynamic impact force of spline teeth, it is found that the root mean square (RMS) value of impact force reaches to the smallest when pressure angle is set as 25.