Principles of naval engineering - Historic Naval Ships Association

PRINCIPLES OF NAVAL ENGINEERINGOILSLINGER RADIAL COMPRESSOR BEARINGBEARINGRETAINERSLIPPER BEARINGTHRUST SLEEVEFigure 23-12.— Slipper bearing.147.146for balance errors to take place when the engineis operating.One type of slipper bearing is shown in figure23-12. In this type of bearing, the slipper consistsof four pivoted-shoe segments, similar tothe pivoted shoes used in Kingsbury bearings.The segments are held together loosely by awire spring.Another type of slipper bearing is shown infigure 23-13. In this type of bearing, the slipperconsists of six segments which are fastened inplace by dowel pins. This type of bearing issometimes called a fixed-pivot slipper bearing.Accessory DrivesBecause the turbine and the compressor areon the same rotating shaft, a popular misconceptionis that the gas turbine engine has onlyone moving part. This is not the case, however.A gas turbine engine requires a starting device(which is usually a moving part), some kind ofcontrol mechanism, and power take-offs.The accessory drive section of the gasturbine engine takes care of these variousaccessory functions. The primary purpose ofthe accessory drive section is to provide spacefor the mounting of the accessories requiredfor the operation and control of the engine.Secondary purposes include acting as an oilreservoir and/or oil sump and providing forFigure 23-13.— Slipper bearing(fixed-pivot type).147.147604