船舶 推進軸系用 多板 摩擦 클러치 損傷 原因分析에 關한 硏究

Abstract

This paper provides root cause analysis of the hydrauli -cally actuated multidisc friction clutch sticking in ship running in the field of marine propulsion power trans -mission control system.

It is aimed for correct diagonosis, analysis to prevent recurring of the diesel engine reduction gear imbeded clutch troubles such as heating, deformation, unusual abrasion and sticking of the friction plates.

It is proved that the root cause of these troubles are slip, heating caused by leakage of clutch control oil and cooling oil due to a crack on the assembled hollow clutch shaft.

The fishbone method is used to study the troubleshooting through disassembling of the clutch and diesel engine reduction gear, and investigation of components, onboard function test including nondestructive testing.

The cracked clutch shaft was bended and whirled at the joint of clutch. Thus, the cooling and clutch control oil are leaked to sump tank through the cracked crevice.

In addition to mechanical cause of the failure, propulsion machinery running data logging of machinery control, alarm and monitoring system was investigated and analysised to seek faulty cause.

The more detailed analysis based on running data logg -ing, a 2nd filter clogging may have caused the clutch sticking, and the most dominant factor was cooling oil leakage among them.

The results of the study are useful to design intigration of marine propulsion system, reduction gear, and diagonosis of clutch troubleshooting.