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Abstract

Many journal bearings exist in an engine. Therefore, the effects of operation and design parameters of a journal bearing on power loss are the important information. In this study, simplified estimation method of bearing friction is proposed by means of a regression equation. Dimensional analysis on friction of a journal bearing is performed for the operation and design parameters using hydrodynamic lubrication under steady load. Based on the dimensional analysis, the effect of the parameters is evaluated and the regression equation is proposed. The regression equation is fitted for two cases; one is based on calculated frictions with hydrodynamic lubrication under steady load and the other is based on experimental frictions obtained using a bearing test apparatus. In the bearing test apparatus, a rotor is supported by a pair of test journal bearings and friction torque of the test journal bearings is measured based on angular deceleration of the rotor. Power loss of journal bearing is numerically calculated with hydrodynamic lubrication under dynamic load of an engine and it is compared with the power losses estimated with the regression equations. Finally, the suitability for the simplified estimation method is discussed.

Keywords

Bearing friction hydrodynamic lubrication measurement engine regression equation

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Simplified estimation method of bearing friction for engines

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