TOOTH CONTACT ANALYSIS OF CONICAL INVOLUTE GEARS

The mathematical model of conical involute gears is developed based on the theory of gearing and the generating mechanism. Tooth contact analysis （TCA） is performed to examine the meshing and bearing contact of the conical involute gear pairs with intersected and crossed axes. In addition, the principal directions and curvatures of the gear surfaces are investigated and the contact ellipses of the mating tooth surfaces are also studied. Finally, the numerical illustrative examples are provided to demonstrate the computational results, test gears are made for tooth-bearing tests, and the conclusion is verified that the theory has the applicability.

基于精密铸造技术的螺旋齿面齿轮拓扑齿面计算机辅助设计

为了获得高啮合稳定性的面齿轮传动机构,提出了一种螺旋齿面齿轮计算机辅助三维拓扑修形设计,获得点接触面齿轮啮合副以避免发生边缘接触的方法。首先建立接触路径修形设计的数学模型,采用虚拟插齿面齿轮原理,通过预先设计的传动误差函数实现了沿期望接触路径的齿面齿廓修形;然后利用计算机辅助设计技术构建沿接触线修形的数学模型,进行了沿接触线方向修形设计;通过修形量的叠加,重构了三维拓扑修形齿面,最终获得点接触双凸型面齿轮传动。最后以两种不同修形参数的螺旋齿面齿轮为例进行了轮齿接触分析(tooth contact analysis,TCA)。结果表明:设计参数与仿真结果高度一致,验证了计算机辅助修形设计方法的合理性。