Abstract
In this study, the lubrication performance of the crank pin bearing in a marine two–stroke diesel engine is evaluated to investigate the adhesional failure on the crank pin bearing. A numerical algorithm for the lubrication analysis considering motion analysis of the crank pin system is developed. The film pressure and thickness for three clearances and three lubricant temperatures are calculated. The results show that the lubricant temperature has a higher effect on film thickness than clearance. In terms of the film parameter, the operating condition that can result in solid–solid contact is investigated. We also suggest the desirable operating conditions of clearance and lubricant temperature to prevent the solid–solid contact.
Highlights
The wear caused by insufficient lubrication is the most general cause of endurance life issues
Insufficient lubrication caused by factors such as a machining error in the manufacture of the crank pin and the bearing leads to solid–solid contact between the crank pin and the bearing, which results in adhesional wear
We developed a numerical algorithm for the hydrodynamic lubrication analysis coupling with the motion analysis of the piston–connecting rod–crank arm system
Summary
The wear caused by insufficient lubrication is the most general cause of endurance life issues. Insufficient lubrication caused by factors such as a machining error in the manufacture of the crank pin and the bearing leads to solid–solid contact between the crank pin and the bearing, which results in adhesional wear Prolonged operation under such conditions results in complete destruction of the part. Wu et al [12] developed an EHD coupling analysis model for the main bearing lubrication of a marine diesel engine using AVL Excite software, and explored the main bearing’s vertical load, orbital path and minimum oil film thickness. A lubrication analysis was conducted to reveal the cause of adhesional failure on the crank pin bearing of a marine two-stroke diesel engine. The calculated film thickness was compared with the measured surface roughnesses of the crank pin journal and the bearing
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