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Rolling Friction Torque in Ball-Race Contacts Operating in Mixed Lubrication Conditions

Department of Mechanical Engineering, Mechatronics and Robotics, Technical University "Gheorghe Asachi" Iasi, Bld. D. Mangeron, 53, 700050 Iasi, Romania
TIMKEN Europe, 2 rue Timken, B.P. 60089, 68002 Colmar, France
Author to whom correspondence should be addressed.
Academic Editors: Romeo P. Glovnea and Michel Fillon
Lubricants 2015, 3(2), 222-243;
Received: 5 October 2014 / Revised: 2 December 2014 / Accepted: 16 February 2015 / Published: 13 April 2015
(This article belongs to the Special Issue Friction and Lubrication of Bearings)
PDF [511 KB, uploaded 14 April 2015]


Based on a theoretical model and an experimental methodology for defining the friction torque for lubricated conditions in a modified thrust ball bearing having only three balls, the authors experimentally investigated the influence of the lubricant parameter Λ on friction torque for mixed IVR (isoviscous rigid) and EHL (elastohydrodynamic) lubrication conditions. The experiments were conducted using ball diameters of 3 mm, 3.97 mm and 6.35 mm loaded at 0.125 N, 0.400 N and 0.633 N. Two oils of viscosity 0.08 Pa·s and 0.05 Pa·s were used and rotational speed was varied in the range 60–210 rpm to obtain a lubricant parameter Λ varying between 0.3 and 3.2. The experiments confirmed that the measured friction torque can be explained using hydrodynamic rolling force relationships respecting the transition from an IVR to an EHL lubrication regime. View Full-Text
Keywords: rolling friction; lubricated contacts; thrust ball bearing; elastohydrodynamics rolling friction; lubricated contacts; thrust ball bearing; elastohydrodynamics

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MDPI and ACS Style

Bălan, M.R.D.; Houpert, L.; Tufescu, A.; Olaru, D.N. Rolling Friction Torque in Ball-Race Contacts Operating in Mixed Lubrication Conditions. Lubricants 2015, 3, 222-243.

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