| The lubrication system is an important part of the diesel engine and its performance depends on the operational safety of the entire machine.In view of the increasingly difficult energy development,the working conditions of the diesel engine are also more complex and heavier.The lubrication system is developing towards low fuel consumption,low power consumption and large oil change cycles.In order to avoid the consequences of reduced storage capacity,increased mechanical loss and damage of parts due to poor lubrication and at the same time to achieve an adequate oil supply of the diesel engine,In order to reduce energy losses caused by excessive oil supply and to operate the diesel engine more safely and economically,the lubrication system must be thoroughly investigated and analysed and optimised in line with actual demand.Using a 16-cylinder high-speed diesel engine as a research object,this paper describes the basic principle and the composition of its lubrication system in detail and constructs a simulation model.The analysis of key data such as circulation volumes and oil pressure of the lubrication system ensures sufficient lubrication of the system.Subsequently,the mechanism of action of the oil pump speed,the main oil channel diameter,the main storage radius freedom and the storage width on the river field characteristics will be further investigated.On the basis of the overall analysis results of the lubrication system,the main bearing,connecting rod bearing and cam bearing were taken as the research objects,and the lubrication numerical model was established based on Reynolds equation for iterative solution.The pressure distribution,oil film thickness distribution and friction power consumption of each bearing were obtained.The results show that the layer thickness of the main warehouse under the original operating condition is much higher than the permitted standard,in the state of excessive oil supply,and the friction requirement is also high.Therefore,the lubrication performance of the main bearing is considered as an optimization purpose,the evaluation indices are determined as minimum oil film thickness and friction force consumption and the influence of different design parameters is investigated.Based on the above analysis results,the range analysis of the parameters examined in the lubrication system is performed by the orthogonal test method.The width of the bearing is the main factor influencing the minimum oil film thickness and the radial freedom is the main factor influencing the friction consumption.The optimal combination shall be determined taking into account the response of the evaluation index to the individual factor levels.The optimized parameters are entered into the calculation model.Compared to the original scheme,the minimum oil film thickness of the optimized main warehouse of 5.209 μm is decreased to 4.549 μm.The friction requirement is reduced from 6.336 kW to 5.097 kW,which lessens the friction loss while maintaining good lubrication.At the same time,the flow is diminshed by 11.3%,the pressure of the main oil transition is lowered by 8.6%,and the electricity consumption of the oil pump is reduced by 21.28 kW,cutting down on the oil consumption and energy loss of the entire lubrication system.Therefore,the objective of reasonable oil supply and a reduction in energy consumption is accomplished. |
PDF Full Text Request