Increasing the resistance of scuffing for HCR external helical gearing

Abstract

© 2018, Springer International Publishing AG, part of Springer Nature. The paper analyses the way to increase the resistance of HCR external involute gearing from a scuffing point of view. The scuffing is the most important damage of teeth flanks of HCR involute gears. In the case of warm scuffing; it is the combined action of high pressure between surfaces, high sliding speeds, and excessive contact temperature, resulting from pressure and sliding speed values, which cause oil film rupture between the teeth flanks. Adopting suitable geometry of the tooth curve profile, it will be defined certain values addendum heights for meshing wheel according to criteria of specific slips and corrected head shape of the teeth of both wheels. The paper deals with assessment and theoretical analysis of the impact of the HCR tooth profile resistance to scuffing on the basis of integral temperature criterion according to Winter-Michaelis criterion, researching especially two factors: factor of load distribution (Xε) and factor of gear geometry (XG).