Investigation of the effect of height correction of metal-polymer helical gears teeth on contact pressures, wear and durability

A study of the effect of height correction of the engagement of helical gears on contact pressures, tooth wear and durability using the author's method of calculating metal-polymer gears was conducted. Carbon steel 0.45%C was chosen for the pinion, and polyamides PA6 or PA6 + 30% CF were chosen for the gear. At different helix angles and shift coefficients the estimation of maximum contact pressures in engagement is carried out. Quantitative and qualitative regularities of influence of both factors on contact pressures considering conditions of teeth engagement are established. The teeth linear wear is differentiated during the engagement cycle depending on parameters of correction and helix angle. Its values have been established at the characteristic engagement points: at the entrance; at the entrance to the central phase and at the exit from it; at the exit from the engagement. The durability is significantly affected by both the correction of engagement and the helix angle. Quantitative and qualitative regularities of this influence are established. The presence of the optimum shift coefficients at which the gears durability will be the highest has been established. MP gears with a gear made of PA6 + 30CF will have significantly higher durability than PA6.