This paper reports the updated program of the UE engine, and focuses on the UEC45LSE now under development. It also discusses design methods using 3D-CAD, and offers the latest information about the SIP system. Furthermore, this report includes a description of a water injection system as an example of the new environmentally friendly technologies that are becoming available. The latest UE series, the LSE, was introduced in 1998, and five LSE types appear in our brochure at present. The LSE is a new generation engine targeted for larger and faster ships in recent years, and its design concepts are excellent reliability, economy, easy maintenance and environmental friendliness. The UEC45LSE is a new comer in the LSE and its development is now in progress. So far, many 6UEC52LA have been installed in Handysize BC due to their low fuel oil consumption and high reliability. However, the UEC52LA is heavy and large because it was developed 20 years ago; thus development of the UEC45LSE was commenced as a successor to the UEC52LA to overcome these disadvantages of engine dimensions. Based on comprehensive market research, the UEC45LSE has appropriate output that is not excessive for Handysize BC. Also, suitable engine speed, bore and stroke were decided. As a result, compact engine dimensions can be achieved. Since Mitsubishi is the only 2-stroke engine designer in the world that is manufacturing engines, we are always taking production into consideration when developing engines. With this in mind, we apply 3DCAD and CAM at developing the LSE, and these tools contribute to enhancing quality and reliability of engines. For designers, 3D-CAD is a useful tool for visually confirming three-dimensional configurations on a computer screen, even if the configurations involve complicated shapes. Additionally, since manufacturing section staff can also access the data base of 3D-CAD drawings, they can study the manufacturing procedures and offer feed-back on the drawings during the initial design stage. Furthermore, as for CAM, numerical control data for machining can be directly made from 3D-CAD data. Shipowners reported that in case of large container ships, the rate of cylinder oil cost dominates more than 80% of the total maintenance costs of marine diesel engines. Therefore, reducing cylinder oil consumption can contribute to a reduction in ship operating costs. The SIP system is an epoch-making cylinder lubrication system that can decrease cylinder oil consumption, and the number of installations has been increasing each year. The SIP system injects cylinder oil like a spray, and eliminates cylinder oil being splashed up and down due to piston ring movement. The regulation of Annex VI of MARPOL73/78 went into effect in 2005, and all UE engines are fully compliant with this regulation. However, in the future, NOx limits will be stricter and new regulation items will be added. For this reason, we have been developing new technologies that will comply with future regulations. In relation to NOx reduction, the electronically controlled engine and/or a water injection system can be applied after the second regulations.
The latest developments and technologies of the UE engines
2007
9 Seiten, 24 Bilder, 7 Quellen
Conference paper
Storage medium
English
The latest developments & technologies of the UE engines
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