Ⅲ.主潤滑油ポンプモーター不釣り合い

摘要

船内作業で整備した2号主潤滑油ポンプモー ターが、運転中に異常振動が発生し連続運転 が不可能な状態となった。開放時に交換したィンファン（添付図⑩： モ一ター内部に対流を発生させて冷却効果を 高めるための部品）のバランシング不良が原 因ではないかと考え、再度新品と交換したが 変化がなく、またインファン以外の部品にも 外的損傷が見当たらないため、ローター自体 のアンバランスが疑われた。（ただし、ロー ターおよびインファンは、個々にメーカー出 荷時にバランシングが行われている。）%The No.2 main lube oil pump Motor, which had been maintained onboard the captioned vessel, started to vibrate abnormally and its continuous operation became impossible. Suspecting that the improper balancing of the infan (⑩in the attached diagram, a part to facilitate cooling by creating air circulation) ， which had been exchanged during the overhaul, was the cause of the vibration, this part was again replaced with a new one, but the vibration did not disappear. Since no other parts had physical damage, it was suspected that the rotor itself was not balanced. (Both the rotor and the infan had been balanced individually before delivery by the manufacturer.)