大型低速ディーゼル機関の溶射シリンダライナの開発

概要

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Large-bore, low-speed diesel engines have traditionally been equipped with cylinder liners made of gray cast iron for its superior combination of strength and sliding performance. Recently, though, a dramatic improvement has been sought in this technology region to cope with demand for higher engine ratings, use of low quality fuel, reduction in lubricating oil consumption, and so on.<BR>To meet this demand, a spray-coated cylinder liner was developed and a full-scale onboard service test started in May 2000. The results, after more than 26, 000 operating hours, reveal that the wear rate of the spray-coating layer on the cylinder liner is quite low and the piston rings maintain an acceptable wear rate. In one case, initial wear of around 10/1000 mm was measured, then no more wear occurred afterward. The wear rate of the piston rings remained the same as that for piston rings combined with gray cast iron cylinder liners.
社団法人日本マリンエンジニアリング学会の論文