小模数,多齿数行星齿轮传动及其在采煤机械中的应用

作者提出与以往齿轮设计配齿原则不同的按小模数、多齿数设计行星齿轮传动的观点。分析了该设计法优点及应用条件，并指出确定模数、齿数的方法。最后，结合ＭＧ３００－ＡＷ１采煤机例子，介绍了实际应用效果。

The Small modulus and Many tecth planetary Gear Transmission and Its Application in Coal Shearer

This paper provide a design method of planetary gear transmission with small modulus and many teeth. Film Under a Dry Friction$$$$ Zhu Wenjian et al Abstract Adding Chemical compound with F,S,Cu element in friction material,this paper discusses formative mechanism of surface film under a dry friction.Also,it probes into the influence of additive for character of rubbing wear.The experiments express,adding additive of surface film with S element,it can depress the wear of surface,but at a disadvantage for stabilization friction coefficient.It is advantage for depression the wear of surface and stabilization friction coefficient,adding with F and Cu elements.This paper proposes a method for control and stabilization friction coefficient and depression wear of surface,it has been verified in practice.