基于MDESIN采煤机截割部行星传动的齿形优化

Tooth Profile Optimization of the Shearer Cutting Unit Planetary Transmission Based on MDESIN

采煤机截割部行星传动在其啮合过程中不可避免地会出现齿轮偏载情况,以提高受接触强度和弯曲强度为目标函数,利用MDESIGN软件对其行星轮系在3种不同工况下进行啮合性能研究,综合分析得到在额定负载1.3~1.5倍左右的工况下太阳轮与行星轮的修形量最佳,其修形量组合分别为31~34μm与21~24μm。经优化后的齿轮接触应力由原先的1215 MPa减少到了1118 MPa,降低了约7.9%;太阳轮齿面最大载荷分布由270 N/mm减少为235 N/mm;接触温度由92℃减小为86℃;行星轮齿面最大载荷分布由290 N/mm减少为234 N/mm;接触温度由80℃减少为75℃,齿面载荷分布与温度的优化率达到了13%和8%左右,有效降低了接触应力、缓解了偏载,行星传动系统的承载能力得到显著的改善。

In the meshing process of the planetary transmission of the shearer cutting unit,unbalance loading of gears is inevitable.Improving the contact strength and bending strength is used as the objective function.MDESIGN software is used to study the meshing performance of its planetary gear train under three different working conditions.Comprehensive analysis shows that the sun gear and planetary gear have the best modification amount under the working conditions of about 1.3~1.5 times the rated load,and the modification amount combination is 31~34μm and 21~24μm,respectively.The optimized gear contact stress is reduced from the original 1215 MPa to 1118 MPa,which is reduced by about 7.9%;the maximum load distribution on the sun gear tooth surface is reduced from 270 N/mm to 235 N/mm;the contact temperature is reduced from 92℃to 86℃;The maximum load distribution of planetary gear tooth surface is reduced from 290 N/mm to 234 N/mm.The contact temperature is reduced from 80℃to 7℃,and the optimization rate of tooth surface load distribution and temperature has reached about 13%and 8%,which effectively reduces the contact stress and eases unbalance loading.The bearing capacity of the planetary transmission system has been significantly improved.