The influence of circumferential waviness of the journal on the lubrication of the inter-main bearing of an automotive engine is investigated using a theoretical analysis. The analysis is for two-dimensional thin film flow, with oil-film history. The bearing and shaft surfaces were assumed to be rigid and the lubricant isoviscous. The results show a significant influence of shaft lobing on predicted maximum film pressure and minimum film thickness, particularly as the number and size of lobes increase. It is concluded that, for satisfactory operation of engine bearings, circumferential form errors of the shaft need to be controlled.
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