Micropitting of Big Gearboxes: Influence of Flank Modification and Surface Roughness

摘要

Micropitting - or grey staining - is a fatigue failure on tooth flanks that is mainly influenced by lubrication conditions that can compromise the dynamics and noise behavior of gearboxes. Furthermore, it can lead to larger cracks and, finally, to pitting. Present experiments on micropitting have been conducted, primarily on small-module gears. Test runs on spur gears with a module of 22 mm on a large-gear test bench (center distance 447 mm) and, for comparison with previous investigations, test runs on a standard gear test machine were performed. The experiments concentrated on lubrication behavior impacted by changing additives, temperatures and circumference velocities on the one hand, and surface roughness and profile form modification on the other. A comparison of calculations according to FVA 259 (Ref. 1) and actual test results help to validate the method for large modules.