TEHL simulation on the influence of lubricants on load-dependent gear losses

TEHL Simulation on the Influence of Lubricants on the Frictional Losses of DLC Coated Gears

“…The transient TEHL contact of DLC coated spur gears is analyzed using the TEHL simulation model described by Lohner et al [19] and Ziegltrum et al [20]. Only the main physical and numerical characteristics are described below.…”

“…Only the main physical and numerical characteristics are described below. The employed explanations and formulations are based on [19,20].…”

“…The numerical procedure of the TEHL simulation model is based on a complete FE formulation that follows the full-system approach, which is coupled iteratively with thermal equations (Habchi et al [26]). Its application to the transient TEHL contact of spur gears was shown by Ziegltrum et al [20] and implemented in the commercial software COMSOL Multiphysics [36]. The coatings are considered by additional computational domains for the deformation and temperature calculation as suggested by Habchi [13].…”

“…The solid calculation domains in the FEM-model T are meshed with a refinement on the substrate-coating boundaries. For more details, the reader is referred to Ziegltrum et al [20] and Lohner et al [19].…”

“…Other suggested effects as wall slip [6,7] are not discussed. As the influence of lubricants with different rheological properties on the friction reduction of DLC coatings has hardly been considered so far, this study investigates the influence of different base oils on the friction of DLC coated spur gears using a TEHL simulation model based on Lohner et al [19] and continues the work of Ziegltrum et al [20]. The results of this study were partly presented at a technical session at the 6th World Tribology Congress in Beijing in 2017 [21].…”