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1 Journal of KONES

1 1999

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Effect of oil viscosity variation on the journal centre trajectory of dynamically loaded journal bearing

Strzelecki S., Wojtasik C.

Journal of KONES

1999

Vol. 6, No. 1-2

167-174

Internal combustion engine journal bearings are dynamically loaded elements of an engine operating at large eccentricities, i.e. under thermo-elastohydrodynamic conditions. It means that the temperature-viscosity relation should be analysed in very exact way to avoid errors during computation of journal centre trajectory and in design of bearings. The paper introduces the calculation of dynamically loaded cylindrical bearing with nonisothermal oil film. The program applied for calculation solves the Reynolds, energy, viscosity equations allowing the determination of the oil film pressure, temperature, viscosity distributions and the resultant force of oil film, journal centre trajectory. The different geometry data of the bearing, i.e. bearing aspect ratios and clearances were assumed.