非圆锥齿轮限滑差速器结构性能仿真及优化设计
Structural Simulation and Optimization Design of Noncircular Bevel Gears for Off-road Vehicle Alterable Torque Differential

为实现越野车的防滑功能，提出了一种新型限滑差速器非圆锥齿轮结构，行星齿轮与半轴齿轮齿数之比为1：2，传动比以行星齿轮转一圈为一个变化周期，可以最大限度地提高传动比的变化幅值达到±40%。针对该齿轮传动的特点和有限元方法理论，提出锥齿轮传动有限元建模与力学性能分析方法。先建立接触面结点耦合的轮系模型，求出给定扭矩下的转动位移，再建立齿面摩擦接触的轮系模型，将转动位移作为输入条件求得锥齿轮工作应力。根据计算结果，对锥齿轮结构进行改进，使其力学特性更佳。对两种结构的变扭矩限滑差速器非圆锥齿轮进行有限元分析比较，证明改进后的结构更合理，所采用的结构设计方法正确有效。
To prevent the trackslip of off-road vehicle, A new type of alterable torque differential with noncircular bevel gearing for off-road vehicles is put forward, in which the transmission ratio varies at a circle of the planetary gear, which has one half the number of the teeth of the half-axle gear. The variable range of ratio can go extreme as much as ±40%, which would be of great help to improve the passing capability of the vehicle. Based on Finite Element Method (FEM), the mechanical property of the gearing is analyzed and the mechanics model is built with a certain torque defined, the rotation displacement of the bevel gear is figured out by close nodes coupling on the contact surfaces. The stresses of all the gears are worked out by means of contact fiction model. The FEM simulation of the differential with improved gears as well as the former one is illustrated and compared in details, which shows the new one is reasonable and the the new design method is effective