STUDIES ON SCORING OF SPUR GEARS : 3RD REPORT, EFFECT OF THE COEFFICIENT OF ADDENDUM MODIFICATION ON SCORING RESISTANCE

Abstract

The scoring resistance of the Vau-Null gear pair whose centre distance is not changed by the variation of the amount of addendum modification was examined from the point of view of the critical surface temperature rise on the meshing faces of the gears, and the following correlations between scoring resistance and the amount of the addendum modification of the gears were clarified : (1) The position of the maximum surface temperature on the meshing faces of the Vau-Null gears is remarkable affected by the number of teeth of pinion, gear ratio, the coefficient of addendum modification of gears and module. (2) The effect of the coefficient of addendum modification on the surface temperature on the meshing faces is complicated, and the optimum value of the coefficient of addendum modification against the scoring resistance of gears is decided by gear ratio.