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Recently, sterntube bearings made of heat stabilized asbestos yarn reinforced cresylic resin are used instead of white metal bearings. The authors have studied experimentally on the performance of friction, wear and resilience of this bearing compared with one of white metal bearing. The results are as follows. (1) This material has high friction coefficient and high wear rate, but no seizure occurred even under no oil supplied condition owing to its oil impregnated fibers. (2) The Young's modulus of this material is smaller than that of white metal by 1/30. Therefore its Hertzian contact area under inclined journal bearing condition is wider than one of white metal bearing by 5 times, and maximum contact stress of this bearing is smaller than one of white metal bearing by 1/10. (3) The specific wear rate is 3.65 × 10-10mm2 /kg. When this bearing is applied to the actual sterntube bearing, it is estimated that the wear life of this bearing is about 8 years. (4) As this material has a rough surface (50-60 μm), the shaft roughness has no great influence upon the bearing performance. Therefore, super finishing of the shaft is not necessary.
公益社団法人日本マリンエンジニアリング学会の論文