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Friction and flash temperature prediction of mixed lubrication in elliptical contacts with arbitrary velocity vector.pdf
Tribology International 99 (2016) 38–46
Contents lists available at ScienceDirect
Tribology International
journal homepage: /locate/triboint
Friction and ?ash temperature prediction of mixed lubrication in elliptical contacts with arbitrary velocity vector
Wei Pu a, Jiaxu Wang a,b,n, Dong Zhu a
a School of Aeronautics and Astronautics Sichuan University, Chengdu 610065, China b State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 40044, China
article info
Article history: Received 19 December 2015 Received in revised form 10 March 2016 Accepted 15 March 2016 Available online 20 March 2016
Keywords: Mixed lubrication Spiral bevel and hypoid gears Friction Elliptical contact Velocity direction
abstract
The effects of friction and ?ash temperature are of signi?cant importance on energy consumption and surface failures of mechanical components. However, available friction and ?ash temperature prediction method may not be appropriate for the condition occurring in real contact, such as spiral bevel and hypoid gears that entraining and sliding velocity directions do not coincide with the principal axis of ellipse, and most of them operate in the mixed lubrication regime due to large sliding speed and serious surface roughness. In the present study, a friction and ?ash temperature prediction approach for this problem is proposed based on a mixed EHL model most recently developed by Pu and Zhu et al. (2014) [20]. Besides, the prediction method is validated by comparing its results with experimental measurements by means of a roughness ellipsoid-on-disc contacts considering the surface velocity directions under severe operating conditions. In addition, numerical simulations are conducted to systematically study the in?uence of surface velocity directions corresponding to different sliding velocity on friction coef?cient and ?ash temperature distribution in wide ranges of speed and load. As a result, the proposed friction and ?ash temperature predi
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