基于齿顶结构设计的面齿轮接触性能优化

Contact Performance Optimization of Face Gear Based on Tooth Top Structure Design

针对面齿轮传动系统存在边缘接触的问题,通过对面齿轮齿顶进行倒圆和削顶优化设计,改善面齿轮传动系统的接触性能。利用有限元软件建立了含齿顶倒圆和削顶的面齿轮仿真分析模型,对传动系统进行准静态接触分析,研究了齿顶倒圆和削顶对面齿轮传动系统啮合力、接触区域以及齿面最大接触应力的影响规律。结果表明:齿顶倒圆可以明显地改善面齿轮系统的边缘接触并降低接触应力,但倒圆半径的增大会降低面齿轮的重合度,降低系统的承载能力,研究对象中面齿轮齿顶进行0.20倍模数的倒圆较为合适。齿顶削顶可以降低面齿轮系统质量,但较大的削顶角度会恶化面齿轮接触性能,使齿轮副产生应力集中,从而使齿轮接触应力增大,研究对象中面齿轮削顶角度为97.5°时较为合适。

Aiming at the problem of edge contact in face gear transmission system,the contact performance of face gear transmission system was improved by optimization design of tooth gear tooth top land fillet for face gear. The simulation analysis model of face gear with tooth top rounding and roof cutting was established using finite element software,the quasi-static contact analysis of the transmission system was carried out,and the effect of tooth top rounding and roof cutting on the meshing force,contact area and maximum contact stress of the face gear transmission system was studied. The results show that the tooth top rounding can significantly improve the edge contact of the face gear system and reduce the contact stress,but the increase of the fillet radius will reduce the contact ratio of the face gear and the bearing capacity of the system. The tooth top fillet radius of the face gear under research with 0.20 times the modulus is more appropriate. Roof cutting can reduce the weight of face gear system,but a larger roof cutting angle will deteriorate the contact performance of face gear,causing stress concentration of the gear pair,thus increasing the contact stress of gear. It is more appropriate when the roof cutting angle of face gear under research is 97.5°.