Premium
Load‐carrying capacity of WC/C‐coated gears lubricated with a low‐viscosity oil
Author(s) -
Kržan Boris
Publication year - 2016
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1305
Subject(s) - pinion , materials science , coating , viscosity , metallurgy , surface finish , composite material , surface roughness , mechanical engineering , engineering , rack
Abstract The application of low‐friction coatings on the surfaces of gear teeth is primarily motivated by the increasing demands for load‐carrying capacity or the rolling‐contact fatigue life. Despite the costs of manufacturing being higher, better performance is an important consideration for many demanding applications. In the present study, we have investigated the load‐carrying capacity of WC/C‐coated gears that were lubricated with an oil blend that was formulated in‐house. A significantly higher load‐carrying capacity was found for the WC/C‐coated gears lubricated with a tailored, low‐viscosity oil in comparison with the case‐carburised gears lubricated with a conventional gear oil of a similar viscosity. The carburised gears failed due to scuffing on the pinion tip, while coating thinning on the pinion face and coating fracture in the wheel‐root area are the dominant failure mechanisms for WC/C‐coated gears. An approximately 40% lower roughness was found on the coated gear flanks. Copyright © 2015 John Wiley & Sons, Ltd.