しゅう動速度が天然海水を混入させた環境対応型潤滑油のトライボロジー特性に及ぼす影響

抄録

In this paper, we analyzed influences of environmentally acceptable lubricants(EAL) with natural seawater on tribological characteristics of stern tube bearings by using 3-pin on disk frictional test apparatus with specimens for stern tube bearing material and propeller shaft material. We focused on 3 types of lubricants, traditional mineral oil, saturated ester-based EAL and unsaturated ester-based EAL, and evaluated the frictional characteristics under various operating conditions by using stribeck curves. As a result, friction coefficients between stern tube bearing material and propeller shaft material for mineral oil, saturated ester-based EAL and unsaturated ester-based EAL are larger by mixed natural seawater compared with that without natural seawater. When sliding speed between stern tube bearing material and the propeller shaft material are larger, its friction coefficient becomes smaller.