Adjustment of processing parameters error of planar enveloping hourglass worms based on the deviations of feature lines

Abstract

Planar enveloping hourglass worm (TP worm) with better load capacity and transmission efficiency is a type of transmission superior to traditional cylindrical worm. It could be used to lightweight design. As the flank of the worm is a complex toroidal surface, higher demands are needed for the manufacture and the assembly. This paper proposes a new principle to adjust the processing precision of the worm. The principle is based on the research on the influence of the parameter errors on the deviations of the feature lines on the flank. With different types of parameter errors, the shape and the value of the deviation curves of the feature lines are different. At last, two cases are introduced to verify that the principle could be used to improve the precision of the TP worm.