Fig. 2.4.8-1 Section of L35MC Engine
In the controllable pitch propeller, the gear-shifting hydraulic pressure is increased to miniaturize the gear-shifting device, and the assembled blades of the propeller boss was adopted, and the lubrication system is of the grease charge type.
In the oil purifier, the LG3 and LG6 type filters were developed as the filter for the engines using marine diesel oil and the filter for treating the drain from the stuffing box of the 2-cycle engine based on the previously developed lubrication oil purifying device, and the FG 10,20 and 30 type fine filters for fuel oil were developed for line-up.
2.4.9 Hitachi Zosen Corporation
(1) Development of New Model
1] The first model of 12K90MC was completed in October, 1997 as the main engine for the 6,600 TEU container carrier. The principal particulars are indicated in Table 2.4.9-1. (Refer to the Photo 2.4.9-1.) The engine aims at low wear and low lub. Oil consumption by the high strength dual cast cylinder liner, the special profile working of the internal surface of the liner, and the CPR top ring.
To cope with the stringent request for the high efficiency and the low noise level of the turbo charger, the axial flow silencer was equipped on the suction port of the turbo charger to clear the regulated value.
2] The first model of 8S50MC-C in the world was completed in October, 1997 as the main engine for the refrigerated cargo ship.
The engine is the first model of the new compact B&W engine S-MC-C series, and S/D was increased to 4.0 and the mean effective pressure was increased to 19 bar to increase the output by 10%, and the engine length was reduced by 10%. The twin stay bolt is adopted as the new design to eliminate the effect of small deformation of the main bearing part. The main bearing, the crank pin bearing and the crosshead bearing are of the aluminum shell bearing excellent in high temperature fatigue strength, and the reliability is improved by adopting the high top land piston and the CPR ring in the combustion chamber.
