Russian Federation
As the degree of forcing marine low-speed diesel engine, the maximum combustion pressure increases, exacerbated the problem of ensuring reliability of the bearing and first crosshead. The paper considers a statistical analysis of failures, their causes and operating conditions of bearings has been carried out. The design features of crosshead bearings are considered, criteria for assessing the bearing capacity and shock loading are proposed. During the operation of the low-speed diesel engine, the most effective measures aimed at improving the performance of bearings are associated with the choice of optimal operating modes of the engine in order to limit the current load and increase the bearing capacity margin. With wear and an increase in bearing clearance the load-bearing capacity of the oil wedge decreases and there is a risk of semi-dry friction and progressive wear. The fatigue strength and durability of the bearing is determined by the temperature of antifriction layer of the lower (support) liner’s part, for the measurement of which a temperature control system was developed. For continuous monitoring of bearings technical condition, the Bearing Wear Monitoring System has shown high efficiency, which measures the combined physical wear of frame crank and crosshead bearings, providing early warning of an increase in the wear rate of liners.
low-speed diesel engine, connecting rod, crosshead bearing, shell, antifriction layer, oil wedge, total driving force, deterioration, fretting corrosion, bearing wear monitoring system
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