分析了对平面二次包络环面蜗杆传动性能有较大影响的５个独立设计参数，采用复合形法，在传动比一定的情况下，对蜗杆的喉部直径因数、母平面倾角、蜗杆形成圆直径因数等参数进行优选，使传动副达到最佳啮合性能．采用该方法设计的平面二次包络环面蜗杆传动副，齿面上没有非工作区，齿面接触线交叉分布，润滑角在６０°～８５°之间，易于形成齿面间流体动压油膜，跑合后能够实现面接触 Five independent design parameters, which have great influence on the transmission performance of planar quadratic enveloping worm, are analyzed. The complex shape method is used to analyze the lath diameter factor, the inclination of the mother plane, Forming circle diameter factor and other parameters of the preferred, so that the transmission to achieve the best meshing performance. The planar secondary enveloping worm gear pair designed by the method has no non-working area on the tooth surface and the contact lines of the tooth surfaces are crosswise distributed, and the lubrication angle is between 60 ° and 85 °, which is easy to form hydrodynamic pressure between the tooth surfaces Oil film, after running to achieve surface contact