DIFFERENT TEETH PROFILE SHAPES OF POLYMER GEARS AND COMPARISON OF THEIR PERFORMANCE

The article presents lifespan testing analysis of polymer gears manufactured by cutting. Compared to injection molding, machine cutting provides higher accuracy of gear geometry. Two different tooth flank geometries were tested; i.e. involute and S-gears. In theory S-gears have several advantages over involute gears due to the convex/concave contact between the matching flanks. Theoretical tooth flank geometry of S-gears provides more rolling and less sliding between the matching flanks. The convex/concave contact leads to lower contact stress, which in combination with less sliding means lower losses due to sliding friction and consequently less heat generated. The goal of our research was to prove that tooth flank geometry affects the lifetime of polymer gears, and to find the mechanisms and quantitative differences in the performance of both analyzed geometries. In lifespan testing, the polymer S-gears showed better performance and longer lifespan than involute polymer gears.