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

Lubricants

Mihaela Rodica D. Bălan¹  Luc Houpert³  Ana Tufescu¹  Dumitru N. Olaru¹  Romeo P. Glovnea² 

[1] Department of Mechanical Engineering, Mechatronics and Robotics, Technical University “Gheorghe Asachi” Iasi, Bld. D. Mangeron, 53, 700050 Iasi, Romania; E-Mails: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; E-Mail:

关键词: rolling friction;    lubricated contacts;    thrust ball bearing;    elastohydrodynamics;   

DOI  :  10.3390/lubricants3020222

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.