The Design of Rolling Bearing Mountings
The Design of Rolling Bearing Mountings The Design of Rolling Bearing Mountings
58–59 Spherical roller thrust bearings as rudder carriersSpherical roller thrust bearings are used when the topbearing mainly has to take up the weight of the rudderand shaft. This is the case for all rudder drives notloaded by lateral forces, such as for rotary vane steeringgears and four-cylinder engines, which do not operatespade-type rudders.The two designs, N and W, for rudder carriers, differonly in their sealing.Bearing selection, dimensioningThe shaft diameter is determined according to formulaeof the Classification Societies. Thus the bore diameterof the rolling bearing is fixed. Due to the highaxial load carrying capacity a spherical roller thrustbearing FAG 29284E.MB with the dimensions 420 x580 x 95 mm is mounted directly on the shaft. Thebearing's index of static stressing f s ≥ 10.The welded housings are extraordinarily flat – theyprotrude just slightly beyond the deck or mountingbase. This provides advantages especially for largersteering engines, since the rudder shaft extension canbe kept short due to the low mounting and dismountingheight.Powerful springs under the bearing outer ring providea permanent positive contact of rollers and raceways.The supplementary plain bearing also accommodatesradial forces, if for example a cylinder in a four-cylindersteering engine fails.Machining tolerancesShaft h7. The housing is relief turned to ensure axialspring preload via the housing washer.Lubrication, sealingDuring mounting, the cavities of the spherical rollerthrust bearings and housings are completely filled withlithium soap base grease (consistency number 2 with EPadditives). As with radial spherical roller rudder bearings,there are also two designs (N and W) in the caseof rudder carrier bearings. Only the seal differs:FAG RS9284N.1..... rudder carrier bearings have feltseals, the rudder carrier bearings FAG RS9284W.1.....are sealed with seawater-proof shaft sealing rings.Both designs have a V-ring seal at the housing cover.58: Rudder carrier bearing FAG RS9284N.1..... 59: Rudder carrier bearing FAG RS9284W.1.....81 FAG
60 Spade-type rudderDesignThe slewing motion is accommodated by a top bearingand a bottom bearing. Both bearing locations areequipped with rolling bearings since they are inside theship's hull. The top bearing or rudder carrier is designedas the locating bearing due to the locating ringbetween cover and bearing outer ring. The bottombearing is the floating bearing. Spherical roller bearingsare used at both locations and the bearingarrangement is therefore statically defined and notaffected by misalignment of housing bores, warping ofthe ship's hull and rudder shaft deformation. Bothspherical roller bearings are mounted on adaptersleeves which are mounted and dismounted by meansof the hydraulic method. The relevant adapter sleeves(HG design) have connecting holes and grooves forthe pressure oil.Operating dataTop bearing:Axial load 380 kN (weight of rudder and shaft).Radial load 1,700 kN (load from rudder and steeringengine).Bottom bearing:Radial load 4,500 kN (load from rudder and steeringengine).Bearing selection, dimensioning, sealingBearing selection is based on the specified shaft diameterand the given loads. Since the bearings only makeslewing motions they are selected according to theirstatic load carrying capacity. An index of static stressingf s ≥ 4 is a must.The bottom spherical roller bearing, an FAG230/750K.MB.R60.210 (or 230/750K.MB.C2), islocated on an adapter sleeve FAG H30/750HG. Sincethis bearing is permanently below the waterline,special sealing must be provided for the shaft passage.The radial sealing rings run on a sleeve made of seawater-resistantsteel. The lips form a grease chamberpermanently pressurized by an automatic grease pump.Some of the grease (lithium soap base grease of the consistencynumber 2 with EP additives) penetrates intothe housing keeping the initial grease packing underconstant pressure.The seal above the bearing (shaft sealing ring and Vring) protects it against water which may either rundown the shaft or collect in the rudder trunk.The top spherical roller bearing, an FAG23188K.MB.R50.130 (or 23188K.MB.C2), ismounted on the shaft with an adapter sleeve FAGH3188HG. The adapter sleeve is fixed axially; belowby the shaft shoulder and above by a split holding ringwhich is bolted into a circular groove in the shaft. Thisupper bearing also takes up the weight from rudderand shaft as well as the radial loads. A shaft sealing ringis fitted at the upper and at the lower shaft diameterfor sealing purposes. There is also a V ring at the uppershaft passage.When relubricating with an automatic grease press, theinitial grease filling is kept under pressure and the sealrings are lubricated at the same time.Machining tolerancesRudder shaft h8, cylindricity tolerance IT5/2 (DINISO 1101). Housing H7.Bearing clearanceThe bearings have a particularly small radial clearance:the lower bearing has 60 to 210 microns or 390 to 570microns and the upper bearing has 50 to 130 micronsor 230 to 330 microns. During mounting, the bearingsare pressed onto the adapter sleeve so far that theyobtain a preload of 20 to 30 microns. With these preloadedbearings vibrations are easily accommodated.FAG 82
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58–59 Spherical roller thrust bearings as rudder carriersSpherical roller thrust bearings are used when the topbearing mainly has to take up the weight <strong>of</strong> the rudderand shaft. This is the case for all rudder drives notloaded by lateral forces, such as for rotary vane steeringgears and four-cylinder engines, which do not operatespade-type rudders.<strong>The</strong> two designs, N and W, for rudder carriers, differonly in their sealing.<strong>Bearing</strong> selection, dimensioning<strong>The</strong> shaft diameter is determined according to formulae<strong>of</strong> the Classification Societies. Thus the bore diameter<strong>of</strong> the rolling bearing is fixed. Due to the highaxial load carrying capacity a spherical roller thrustbearing FAG 29284E.MB with the dimensions 420 x580 x 95 mm is mounted directly on the shaft. <strong>The</strong>bearing's index <strong>of</strong> static stressing f s ≥ 10.<strong>The</strong> welded housings are extraordinarily flat – theyprotrude just slightly beyond the deck or mountingbase. This provides advantages especially for largersteering engines, since the rudder shaft extension canbe kept short due to the low mounting and dismountingheight.Powerful springs under the bearing outer ring providea permanent positive contact <strong>of</strong> rollers and raceways.<strong>The</strong> supplementary plain bearing also accommodatesradial forces, if for example a cylinder in a four-cylindersteering engine fails.Machining tolerancesShaft h7. <strong>The</strong> housing is relief turned to ensure axialspring preload via the housing washer.Lubrication, sealingDuring mounting, the cavities <strong>of</strong> the spherical rollerthrust bearings and housings are completely filled withlithium soap base grease (consistency number 2 with EPadditives). As with radial spherical roller rudder bearings,there are also two designs (N and W) in the case<strong>of</strong> rudder carrier bearings. Only the seal differs:FAG RS9284N.1..... rudder carrier bearings have feltseals, the rudder carrier bearings FAG RS9284W.1.....are sealed with seawater-pro<strong>of</strong> shaft sealing rings.Both designs have a V-ring seal at the housing cover.58: Rudder carrier bearing FAG RS9284N.1..... 59: Rudder carrier bearing FAG RS9284W.1.....81 FAG
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