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On the stern tube bearing of ships that has comparatively wide length and also has overhang weight on an end, bearing load is partial to an end due to lean of the shaft. Therefore, the load condition of this kind of bearing is harsh more than the bearing for general machinery. This becomes especially a big problem with an increase in the size and power rate of ships. Thereupon, the authors have made experimental study utilizing a bearing test stand with a bearing diameter of 200 mm to obtain the various characteristics of the bearing of this system and especially the friction characteristics and seizure conditions at the low speed of shaft. The following results are obtained from experimental study: 1) The friction characteristics at extremely low speed range, at shaft starting, etc. and other various characteristics have been obtained. 2) The border between hydrodynamic lubrication and boundary lubrication has been clarified, and, further, an empirical formula for the frictional coefficient of boundary lubrication has been obtained. 3) A clue of estimating the seizure conditions of the partially loaded bearing has been obtained.
公益社団法人日本マリンエンジニアリング学会の論文