采煤机传动齿轮接触分析及优化设计

通过有限元方法分析齿轮产生裂纹和断裂及销轨磨损的原因,并分别研究了直弧形和弧形优化后的齿轮齿型面的优化效果.分析了这两种优化方案在高速重载情况下轮齿的接触情况及不同型面的接触区域在轮齿啮合过程中的变化规律.计算结果显示,各位置中轮齿上的最大应力均位于轮齿的边缘处,在较大的接触应力作用下,轮齿边缘会产生裂纹并不断扩大,最终导致轮齿的断裂.对齿轮边缘进行圆弧倒角,可以改变最大应力的位置,并且最大Mises应力可降低20％以上,从而解决齿轮的轮齿断裂问题.

Contact Analysis Between Transmission Gear and Pin Rail for Coal Shearer and Optimum Design

To solve the problems of crack and fracture of gears and the wear of pin rails,fault reasons are analyzed using finite element analysis method.The optimization results of the gear tooth profiles are obtained after the line-arc and arc optimizations respectively.In the condition of high-speed and heavy-load,the variation principles of the tooth contact and the different contact zones of engagement process are analyzed for the two optimum designs.The calculation results show that the maximum stress is located at the edges of the gear teeth for the different contact positions.When the teeth are loaded with the repeated large stress,cracks are initiated at the tooth edges,then growing and beaken at last.Gear chamfers using two circulars at the tooth edges can change the location of the maximum stress and the maximum MISES stress can be reduced by 20% or more.