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1 2009

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A study on the adhesion at a micro- and nano-lubrication

Wierzcholski K., Miszczak A.

Journal of KONES

2009

Vol. 16, No. 4

499-506

In this paper describes the study on the adhesion forces at a nano-contact and micro- and at a nano-lubrication. Here are elaborated the dependences between oil dynamic viscosity in super thin boundary layer and adhesion forces as well influences of adhesion forces in micro- and nano-level on the friction forces in micro- and nano-scale arising between two cooperating surfaces in micro-bearings. Up to now the influence of adhesion on oil viscosity changes and on the oil flow in micro-bearing gap was not considered in analytical way. Present paper elaborates the preliminary assumptions of hydrodynamic theory of lubrication for micro-bearing in the case if during the lubrication the adhesion forces are taking into account. In this paper are derived theformulas of pressure distributions, friction forces and friction coefficients where the adhesion forces are considered. The changes of adhesion forces in micro-contact of two bodies dependon the load direction. Load carrying capacity increases implied by the oil dynamic viscosity increases caused by the adhesion and cohesion forces attain about from 20% to 30% in comparison to the viscosity and capacity values in classical form.