Abstract
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.
Highlights
The rolling resistant moment of a ball on a raceway in a bearing is due to miscellaneous factors, including elastic hysteresis losses, curvature effects, pivoting effects, hydrodynamic lubricant resistance and roughness as described by Houpert in [1,2], and form deviation effects
In order to demonstrate the influence of the lubricant on rolling friction in low load conditions, Bălan et al [6] developed a comprehensive analytical model defining the total friction torque in a modified thrust ball bearing as a function of hysteresis losses, curvature effects, inertia effects, air churning effects on disc, and lubricant hydrodynamic rolling resistance described by Houpert [4]
Based on a theoretical model and an experimental methodology for defining the friction torque in a modified thrust ball bearing having only three balls and presented in [6], here the authors have experimentally investigated the influence of the hydrodynamic rolling force FR on the total friction torque at low normal loaded rolling contacts operating in mixed IVR and EHD lubrication conditions
Summary
The rolling resistant moment of a ball on a raceway in a bearing is due to miscellaneous factors, including elastic hysteresis losses, curvature effects, pivoting effects, hydrodynamic lubricant resistance and roughness as described by Houpert in [1,2], and form deviation effects. In order to demonstrate the influence of the lubricant on rolling friction in low load conditions, Bălan et al [6] developed a comprehensive analytical model defining the total friction torque in a modified thrust ball bearing as a function of hysteresis losses, curvature effects, inertia effects, air churning effects on disc, and lubricant hydrodynamic rolling resistance described by Houpert [4]. Based on a theoretical model and an experimental methodology for defining the friction torque in a modified thrust ball bearing having only three balls and presented in [6], here the authors have experimentally investigated the influence of the hydrodynamic rolling force FR on the total friction torque at low normal loaded rolling contacts operating in mixed IVR and EHD lubrication conditions
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