Research on global form deviations for spiral bevel gear based on latticed measurement

In order to improve the machining accuracy of ＇spiral bevel gear, difference surface was adopted to characterize its global form deviations quantifiably and correct its deviations. The theoretical tooth surface model of spiral bevel gear was built, and the actual tooth surface of spiral bevel gear had been got by using latticed measurement. The equation of differ- ence surface which can characterize the actual tooth surface deviations was built by means of mathematical method in combi- nation with measurement principle. The quantitative mathematical relationship between the actual tooth surface deviations of spiral bevel gear and the corrected values of the machine-setting parameters had been referred, and the theoretical correc- tion formula of the global form deviations had been got by the least square method. Finally, the pinion of spiral bevel gear in the automobile rear axle has been set for an example to account for the effectiveness of the deviation correction by use of the difference surface method.