平面二次包络环面蜗杆副应力及影响因素分析

Analysis on Stress Distribution and Influencing Factors of Planar Double Enveloping Hourglass Wom Gears

基于弹塑性接触有限元理论,建立了多组适于蜗杆副静动态接触应力分析的模型,研究了载荷、齿形参数对齿间载荷分配系数和齿面应力分布的影响,计算了各级扭矩下不同包容齿数时的最大齿间载荷分配系数。研究结果表明:随着载荷的增大,齿间载荷分配趋于均匀;接触应力沿接触线从蜗轮齿根到齿顶呈"L"或"U"形分布;齿形参数对应力分布的影响不容忽略,以应力平均分布为目的的参数优化可通过对比有限元分析结果完成。得到了0.05～1.50倍额定扭矩下,包容齿数为3、5、7时的最大齿间载荷分配系数。

Based on the elastoplasticity contact finite element theory,a multi-group static and dynamic contact stress analysis models suitable for the worm gears were established.The influences of the load and parameters on the coefficient of load sharing among teeth and contact stress distribution were studied.The relationship between the number of teeth in the meshing and the maximum coefficient of load sharing among teeth under different loads was calculated.The results indicate：the load distribution tends to be even along with load enlargement;the contact stress distribution along the contact line like ＂L＂ or ＂U＂;the influence of parameters on the stress can not be neglected,it is feasible that parameter optimized aimed at stress hypodispersion by contrasting the finite element analysis results.Under 0.05～1.5 times the rated torque,the maximum coefficients of load sharing among the teeth are obtained when the number of meshing teeth is 3,5,7 respectively.