2.4 Development and Production by Domestic Manufacturers
2.4.1 Akasaka Diesels Limited
(1) New model and development in 1997
No new model was manufactured in 1997, but the technology to detect an abnormality in the cylinder pressure and apply the result to the diagnosis by constantly monitoring the torque fluctuation (torsional angle) of the crank shaft was studied as the abnormality diagnosis technology of the diesel engine.
The torsional angle of the crank shaft was measured by fitting a gear-type electromagnetic pick- up to fore and aft ends of the crank shaft of the 3-cylinder 4-cycle engine, and calculating the differential phase in the signal of each sensor. (Refer to Fig. 2.4.1-1)
Fig. 2.4.1-2 and Fig. 2.4.1-3 show the torque pattern of each cylinder in the normal condition of the engine and the condition where the cylinder pressure was dropped in No. 1 cylinder. As shown in Fig. 2.4.1-3, the peak of the torque of No. 1 cylinder was lower than that of other cylinders, and it can be clearly detected that the pressure in No. 1 cylinder was dropped.
Thus, by constantly monitoring the torsional angle of the crank shaft, the abnormality in the cylinder pressure can be checked.
(2) RENOLD Hi-Tec Elastic Coupling
Seventy five RENOLD elastic couplings capable of ensuring the safe navigation without breakage of rubber, which has been manufactured since 1995, were manufactured and delivered as of December, 1997. At the beginning of the manufacture, the elastic coupling was sold at the HOLSET elastic coupling, and because HOLSET Company changed its name to RENOLD Hi-Tec Company, and the product was renamed to RENOLD elastic coupling on the market. Most of the products were delivered to fishing boats, in addition to some products are equipped on the patrol boats, training ships and cement carriers, with satisfaction of many customers.
(3) Engines manufactured in 1997
4-cycle engine 46 sets 118,200 PS
2-cycle engine 43 sets 299,260 PS
Total 89 sets 417,460 PS
2.4.2 Kawasaki Heavy Industries, Ltd.
(1) Engines developed in 1997 and technical topics
1) The engine of the latest specifications, Kawasaki MAN B&W 10L80MC(Mk5) type (cylinder bore： 800 mm, stroke： 2,592 mm, number of cylinders： 10, output： 46,700 PS, engine speed：93 rpm) was completed as the main engine for the container carrier, and the shop trial was carried out in July, 1997. The crank shaft of inequi-angular ignition type was employed on this engine to control the engine vibration and the hull vibration by reducing the guide force moment. To improve the slidability between the cylinder liner and the piston ring, the high-top land piston with longer top land was adopted in the piston crown.
Fig. 2.4.1-1 Outline of Measuring Apparatus
Fig. 2.4.1-2 Torque Pattern of Each Cylinder
Fig. 2.4.1-3 Torque Pattern of Each Cylinder
