提供了评定单级和多级减速二次包络蜗杆和螺旋蜗杆减速器的方法。包括设计考虑因素，如热限制、使用系数、效率、应力限制、悬臂承载能力和润滑。提供基本压力常数、比率修正系数、表面宽度和材料系数、速度系数、悬臂荷载系数、使用系数、典型摩擦速度和效率的表格。

Provides the method for rating single and multiple reduction double-enveloping worm and helical worm speed reducers. Includes design considerations such as thermal limitations, service factors, efficiency, stress limits, overhung load capacity, and lubrication. Provides tables of basic pressure constants, ratio correction factors, face widths and material factors, velocity factors, overhung load factors, service factors, typical rubbing speeds and efficiency.