Cylinder liner and piston ring lubrication issues in relation to increase stroke/bore ratio
For the 2- stroke marine engines, lubrication of liners and piston rings has always been a field of high interest. Over the years the position and numbers of levels where the cylinder oil is injected, have been subject to many design variants. The issue regarding numbers and positions of the lubrication level, is becoming an important issue with the new trend for 2 stroke marine engines. The trend towards longer stroke/bore ratio will increase the distance from the injection level leading to longer ’road of transportation’ of the cylinder oil. A brief summary of lubrication systems used on MAN Diesel engines, and the basic functions of the cylinder oil will be given. The impact on the tribological system from the increased stroke will be discussed. In this paper service tests with a lubrication level positioned very close the TDC area is reported in details. The results are compared with a ’standard’ execution of the cylinder oil system. Wear measurements and drain oil analysis is used to analyse the effect of different modes of the test unit. I addition to the service test, simulation of the cylinder oil performance is presented. The impact on the oil film thickness in relation to the level where lubrication is injected, and the lubricant transport. The later is of great importance in respect to the oil stress around TDC. Finally the correlation between the service test and the simulations will be discussed.
Shinichi Miyake Kazuo Harada Mikio Kotake Christian Lotz Felder Jesper Weis Fogh
Mitsui Engineering and Shipbuilding Co.LTD,Japan MITSUI ENGINEERING and SHIPBUILDING CO., LTD, Japan MAN Diesel and Turbo,Denmark
国际会议
上海
英文
1-8
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）