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      Film Thickness in Starved EHL Point Contacts

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          Abstract

          This paper presents a numerical study of the effects of inlet supply starvation on film thickness in EHL point contacts. Generally this problem is treated using the position of the inlet meniscus as the governing parameter; however, it is difficult to measure this in real applications. Thus, in this paper an alternative approach is adopted whereby the amount of oil present on the surfaces is used to define the degree of starvation. It is this property which determines both meniscus position and film thickness reduction. The effect of subsequent overrollings on film thickness decay can also be evaluated. In the simplest case a constant lubricant inlet film thickness in the Y direction is assumed and the film thickness distribution is computed as a function of the oil available. This yields an equation predicting the film thickness reduction, with respect to the fully flooded value, from the amount of lubricant initially available on the surface, as a function of the number of overrollings n. However, the constant inlet film thickness does not give a realistic description of starvation for all conditions. Some experimental studies show that the combination of side flow and replenishment action can generate large differences in local oil supply and that the side reservoirs play an important role in this replenishment mechanism. Thus the contact centre can be fully starved whilst the contact sides remain well lubricated. In these cases, a complete analysis with a realistic inlet distribution has been carried out and the numerical results agree well with experimental findings.

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          Most cited references18

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          Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part III—Fully Flooded Results

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            Multilevel matrix multiplication and fast solution of integral equations

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              A Numerical Solution to the Elasto-Hydrodynamic Problem

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                Author and article information

                Journal
                Journal of Tribology
                ASME International
                0742-4787
                1528-8897
                January 01 1998
                January 01 1998
                January 01 1998
                : 120
                : 1
                : 126-133
                Affiliations
                [1 ]Laboratoire de Me´canique des Contacts, UMR CNRS 5514, INSA de Lyon, France
                [2 ]Department of Mechanical Engineering, Tribology Section, Imperial College, London SW7 2BX, U.K.
                Article
                10.1115/1.2834175
                66092c2a-b601-4e14-8959-2ead4594f4fe
                © 1998
                History

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