Abstract
A pair of straight-line tooth profile internal gear and approximated tooth profile mating pinion has been developed to provide easy manufacture of highly accurate internal gear. In this paper, these internal gears are actually manufactured by new developed manufacturing methods, and their angular ransmission accuracies are measured. As a result, it is clarified that the approximated circular-arc which is obtained by applying the least squares approximating method to theoretical profile, is the most available for tooth profile of pinion, and that the higher angular transmission accuracies of ISO grade 4 are realized in the trial manufactured internal gears. Straight-line and circular-arc tooth profiles are the most simple forms, so they can be manufactured accurately and easily by the simple manufacturing methods using the conventional machine tools with simple mechanisms and tools. The measuring methods of individual accuracies of these internal gears by measuring the coordinates of tooth profiles are developed, and it is confirmed that the manufacturing errors can be indicated synthetically by this methods.
