Rolling contact bearing

Elasto-Hydrodynamic (EHD) Lubrication in a Rolling-Contact Bearing... 

I. Burrier, Optimizing the Structure and Properties of Silicon Nitride for Rolling Contact Bearing Performance. Tribol. Trans. 39 (2). 276-85 (1996). 

Investigation of Wear and Friction Properties Under Sliding Conditions of Some Materials, Suitable for Cages of Rolling-Contact Bearings, RX. Johnson, MA. Swikert, and E.E. Bisson, NACA Report 1062,1952. 

In-spite of the assumptions employed to calculate the normal approach component, namely the parabolic approximation outside the Hertzian region and constant film thickness within it, it is believed that the analysis brings the mathematical representation o unsteady elastoh-ydrodynamic a step nearer to the situation encountered in such important applications as gear teeth, cams and rolling contact bearings. ... 

When compared with hard E.H.L. contacts it is also found that the majority of soft E.H.L. contacts have a far greater ratio of surface deformation to film thickness. For example, a very heavily loaded rolling contact bearing will have a ratio of surface deformation to minimum film thickness of around 100. Values nearer 10 are, however, more common. A typical elastomeric shaft seal will have a ratio of deformation to film thickness of between 1000 and 10000, some 100 times greater. 

---