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Abstract
The behavior of newly-assembled, marginally lubricated journal bearings is predicted accurately by the approach of Vogelpohl and Spiegel, who derived an expression for the angular speed at which metal-to-metal contact just occurs. In the present study, it is shown that wear, which occurs in statically loaded bearings, operating under boundary lubrication conditions, may considerably enhance hydrodynamic lubrication conditions, probably because of the fact that improved conformity between journal bearing and bearing surface is obtained. Result obtained with bearings, machined from 11 different bearing alloys show that these differ considerably in specific wear rate (i.e. ranging from 0.55·10−6 mm3/Nm for a white metal on lead basis to 30·10−6 mm3/Nm for a phosphorus containing leaded bronze). The results suggest that for the present bearings (radius of journal, = 12.5 mm; clearance = 37.5 μm; 1/d = 0.5; load = 1,000 N; viscosity at working temperature = 1×10−2 Ns/m2) optimum lubrication conditions are obtained at a maximum wear depth of some 15 μm, i.e. about 40 percent of the initial bearing clearance. The effect of wear completely eliminates the influence of design clearance which manifests itself markedly in newly-assembled bearings.
Presented at the JSLE/ASLE International Lubrication Conference in Tokyo, Japan, June 9–11, 1975.
Notes
Presented at the JSLE/ASLE International Lubrication Conference in Tokyo, Japan, June 9–11, 1975.