The diameter of plane enveloping worm influences on the capability of the worm pair greatly.The relationship between toroidal worm diameter and worm capability is analyzed.The principle to select the worm reference circle diameter is defined.The new method as well as formulas to calculate the worm diameter are put forward.So that
the optimizing way of worm diameter is perfected
the optimizing design software is programmed.By the software
the parameter optimization of the worm pair can be realized