Evaluation of the strength, wear, and durability of a corrected cylindrical involute gearing, with due regard for the tooth engagement conditions

Abstract

A method for calculating the wear and durability of helical gearings is used to investigate the effect of double–single–double tooth engagement on the maximum contact pressures, tooth wear, and durability of a corrected cylindrical involute gearing under constant tooth contact conditions. A technique is presented for determination of the angles of transition from the doubleto the single-tooth contact and vice versa. Gear tooth profile correction is found to reduce the maximum contact pressures by up to 20%. The teeth of the gear wheel reach their wear allowance faster than those of the pinion do. Depending on the degree of correction, the maximum wear occurs at different characteristic contact points: at the entry to the double-tooth mesh, at the entry to the single-tooth mesh, or at the exit out of the mesh. The durability of the gearing is found to be at its maximum at certain overlap ratios, its magnitude being observed to increase substantially (by up to 50%). The results obtained are presented in graphic form, which enables one to reveal the laws governing the effect of the engagement conditions.