CP Propeller Equipment - Martin's Marine Engineering Page

Propeller Shaft and CouplingFlangeThe tail shaft is made of forged steelnormalized and stress relieved, fig 15and table 1.MaterialYield strengthTensilestrengthElongationImpact strengthCharpy V notchBrinell hardnessN/mmN/mm%JoulesHBForged steelCk45Nminimum 285570–690minimum 18minimum 17170–2102 03 24 14–0.0Fig 15: Tail shaftTable 1The tail shaft is hollow–bored, housingeither a pitch control rod or piping forpitch adjustment.InjectorsIn plants with long shaftlines, the distancebetween the journal bearings canbe estimated by means of the followingformula provided the propeller speed isbelow 350 r/min.InstallationdimensionVenting100CL 450 shaft diameter (mm)L = maximum bearing distanceCoupling flangeA two–parted coupling flange isclamped on to the propeller shaft forflange diameters up to 475 mm. Forcouplings with flange diameters above475 mm a special shrink fitted mountingis used, fig 16. High pressure oil of morethan 2,000 bar is injected between themuff and the coupling flange by meansof the injectors. By increasing the pressurein the annular space C, with the hydraulicpump, the muff is graduallypushed up the cone.Longitudinal placing of the couplingflange as well as final push–up of themuff are marked on the shaft and themuff.2 03 32 21–4.0Mark onshaftHydraulic pumpFig 16: Shrink fitted coupling flangeAMeasurement for push–upstamped on the coupling muff14This document, and more, is available for download at Martin's Marine Engineering Page - www.dieselduck.net