非等压力角节点外啮合齿轮油膜厚度的研究

Study of the Oil Film Thickness on a Non-equal Pressure Angle Gear Engaged at a Place Beyond the Pitch Point

以一对渐开线直齿圆柱非等压力角节点外啮合齿轮为研究对象,在综合考虑非等压力角齿轮和节点外啮合齿轮的结构特性的基础上,通过对轮齿啮合过程的分析,推导出齿面最小油膜厚度的计算公式,并对影响油膜厚度的相关因素进行了分析。研究表明:非等压力角节点外啮合齿轮较常规齿轮具有更优的润滑性能;采取增大压力角、变位系数、齿数比和模数可分别将最小油膜厚度提高6.09%、5.46%、9.63%及66.63%。

With a pair of involute straight tooth cylindrical non-equal pressure angle gear engaged at a place beyond the pitch point serving as the object of study,on the basis of the structural characteristics of non-equal pressure angle gears engaged at a place beyond the pitch point being considered in a comprehensive way,through an analysis of the engagement process of the gears,a formulae for calculating the minimum oil film thickness on the surface of the gears was derived and relevant factors influencing the oil film thickness were analyzed. It has been found that compared with conventional gears,non-equal pressure angle gears enjoy better lubrication performance. To take such measures as to increase the pressure angle,modification coefficient,gear ratio and modulus can increase the minimum oil film thickness by 6. 09%,5. 46%,9. 63% and 66. 63% respectively.