1. A calculation model for transient thermal elastohydrodynamic simulation was introduced. 1.1 applied on tooth flank contact of a helical gear pair 2. Multi-layer DLC coating and realistic rheological behavior of the fluid were taken into account. 3. DLC coated tooth flanks reduced power loss as a result of reduced hydrodynamic friction due to higher temperatures. 3.1 DLC coating on both gears led to highest temperatures and lowest power loss 4. Higher temperatures in DLC coated contacts could be attributed to the insulating effect of the coating due to poorer thermal conductivity. 5. Power loss results are limited to mild mixed friction conditions. 5.1 boundary friction coefficient of DLC coating may be different.
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