Ðề: Bôi trơn đặc biệt cho tàu biển.
Ở đây có nói về hệ thống bôi trơn cho động cơ Diezel tàu thủy
http://www.mediafire.com/?k18qvpsm7oz577p
Còn nhiều các hệ thống bôi trơn, dầu mỡ bôi trơn khác cho các cơ cấu khác trên tàu thủy nữa. Một thời gian nữa có tài liệu mình sẽ post
LUBRICATION SYSTEM
The lubrication system of an internal-combus-tion engine is very important. If the lubricatingsystem should fail, not only will the engine stop,but many of the parts are likely to be damagedbeyond repair. Therefore, when lubrication failureoccurs, the engine can seldom be run againwithout a major overhaul.The lubricating system delivers oil to themoving parts of the engine to reduce friction andto assist in keeping the parts cool. Most diesel andgasoline engines are equipped with a pressurelubricating system that delivers the oil underpressure to the bearings and bushings and alsolubricates the gears and cylinder walls. The oilusually reaches the bearings through passagesdrilled in the framework of the engine. Thelubricating system of a typical diesel engine isshown in figure 7-10.All of the engine parts are lubricated with oildelivered by a gear-type oil pump. This pumptakes suction through a screen from an oil panor sump. From the pump, the oil is forced throughthe oil filter and the oil cooler into the main oilgallery. The oil is fed from the main gallery,through individual passages, to the main crank-shaft bearings and one end of the hollowcamshaft. All the other moving parts andbearings are lubricated by oil drawn from thesetwo sources. The cylinder walls and the teeth ofmany of the gears are lubricated by oil spraythrown off by the rotating crankshaft. After theoil has served its purpose, it drains back to thesump to be used again.The oil pressure in the line leading from thepump to the engine is indicated on a pressuregauge. A temperature gauge in the return lineprovides an indirect method for indicatingvariations in the temperature of the engine parts.Any abnormal drop in pressure or rise intemperature should be investigated at once. It isadvisable to secure (shut down) the engine untilthe trouble has been located and corrected.Constant oil pressure, throughout a widerange of engine speeds, is maintained by the oilpressure relief valve that allows the excess oil toflow back into the sump. All of the oil from thepump passes through the filter unless the oil iscold and heavy or if the filter (or oil cooler) isclogged. In such cases, the bypass valve (filterbypass valve or cooler bypass valve) is forcedopen; and the oil flows directly to the engine. Partof the oil fed to the engine is returned throughthe bypass filter, which removes flakes of metal,carbon particles, and other impurities.
