1: Introduction 2: Bearing Classification and Selection 3: Surface Topography 4: Lubricant Properties 5: Bearing Materials 6: Viscous Flow 7: Reynolds Equation 8: Hydrodynamic Thrust Bearings - Analytical Solutions 9: Hydrodynamic Thrust Bearings - Numerical Solutions 10: Hydrodynamic Journal Bearings - Analytical Solutions 11: Dynamically Loaded Journal Bearings 12: Hydrodynamic Journal Bearings - Numerical Solutions 13: Hydrodynamic Squeeze Film Bearings 14: Hydrostatic Lubrication 15: Hydrodynamic Bearings - Considering Fluid Inertia 16: Gas-Lubricated Thrust Bearings 17: Gas-Lubricated Journal Bearings 18: Hydrodynamic Lubrication of Nonconformal Surfaces 19: Simplified Solutions for Stresses and Deformations 20: General Solution for Stresses and Deformations in Dry Contacts 21: Elastohydrodynamic Lubrication of Rectangular Conjunctions 22: Elastohydrodynamic Lubrication of Ellipitcal Conjunctions 23: Film Thicknesses for Different Regimes of Fluid Film Lubrication 24: Rolling-Element Bearings 25: Additional Elastohydrodynamic Lubrication Applications 26: Non-Newtonian Fluid Effects in Elastohydrodynamic Lubrication 27: Thermo Elastohydrodynamic Lubrication.

The Effect of Oil Supply on Cage and Roller Motion in a Lubricated Roller Bearing

Fundamentals of fluid film lubrication

The time to lubricant film breakthrough in an oil-lubricated spherical roller bearing has been measured using SKF Lubcheck for various settings of bearing load, outer ring temperature, shaf...

Loss of lubricant from oil-lubricated near-starved spherical roller bearings

A new ball bearing behavior model which predicts and locates power losses in a high-speed gearbox angular contact ball bearing, operating under axial and radial loads, is presented. Its new features come from the consideration of both cage action and effect of lubricant film thickness in the computation of bearing kinematics at equilibrium. Lubricant rheological properties are used in order to calculate hydrodynamic and elastohydrodynamic forces in each lubricated contact of the mechanism. This model considers cage and ball kinematics to be unknowns. These are obtained by setting motion equations for each bearing element. The computation and the location of power losses are given by the friction forces and the sliding speeds among the various bearing elements, i.e., contact between ball and inner or outer ring, ball-cage, and cage-ring. The total power loss varies strongly with the rotational shaft speed and the oil flow through the bearing; nevertheless, it is hardly sensitive to axial and radial loads. ...

Power loss of gearbox ball bearing under axial and radial loads

The use of diamond-like carbon (DLC) coatings to improve the performance of more complex mechanical components or systems is currently increasing rapidly. Higher demands on robustness and reliability and less maintenance imply that incremental improvements in steel or lubricants is no longer sufficient and therefore DLC coatings, belonging to the family of hard wear-resistant coatings, have become a realistic option also for components such as bearings, gears, joints or cams. This paper describes the development of DLC coatings for highly loaded components with complex geometry made from low-temperature stabilized steel, exemplifies their performance with test results and discusses relevant test and quality control methods for component coatings. Finally, an outlook on the future of surface engineering of components is given.

Diamond-like carbon coatings in rolling contacts:

This paper summarizes measurements of starting torque and motion of the rollers in a roller bearing during start-up at a temperature of − 30°C. The bearing was lubricated with three different greases and the tests were carried out after a running-in procedure at + 20 °C. The results were compared with measurements obtained at +20°C and with results from one base oil at +20°C. A model for the roller motion was also built and simulations of the roller motion were compared with the measurements.Independent of temperature and lubricant the rollers rolled in the loaded zone and slipped, more or less, in the unloaded zone. The degree of sliding in the unloaded zone was found to be governed mainly by the local lubricant distribution and the position of the roller in the cage pocket. Some differences are also seen in the slide-roll ratio between the lubricants. A roller diameter difference of 1.3 pm gave a significant difference in roller motion, with the slightly thinner roller slides more in the unloaded zone o...

The Effect of Oil Supply on Cage and Roller Motion in a Lubricated Roller Bearing

Citations

Fundamentals of fluid film lubrication

Loss of lubricant from oil-lubricated near-starved spherical roller bearings

Power loss of gearbox ball bearing under axial and radial loads

Diamond-like carbon coatings in rolling contacts:

Analysis of a Grease-Lubricated Roller Bearing under Arctic Conditions

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