The Lubrication Performance Analysis And Numerical Simulation Of Engine Main Friction Pair Under High Temperature

With the increasingly serious global environmental problems and energy dried up, to improve the performance of the engine, for further optimization design, the development of new efficient engine has become a trend. Under the high temperature and high pressure working environment, the optimization of dynamic mechanism of crankshaft connecting rod piston engine has also become more and more important. The thermal load and mechanical load will cause the piston to produce cracks, piston ring glued and scuffing of cylinder bore and so. High speed also result of severe wear of the main bearing part, together with the lubricating oil in the lubrication system, the condition is more complex, its dynamics performance directly affects the stability and efficiency of engine operation, it has important significance in improving its working reliability. It seems extremely important to do dynamic analysis of the core components of the piston crankshaft connecting rod system. In this paper, aiming to a special crankshaft-connecting rod-piston system and sliding bearing part of a new engine. The author did research on analysis of main engine lubrication friction, and the establishment of dynamic model and simulation, resulting in changes of the kinetic parameters.This paper first analyzes state the research of the dynamics of the piston and cylinder liner system, sliding bearing (main bearings, connecting rod bearings), on the basis of this, It stressed discussing fluid dynamic hydrodynamic lubrication model of the piston-cylinder liner, and crankshaft main bearing, and the relevant equation of this part.This paper firstly analyses the crankshaft main bearing system, piston and cylinder system, establishes the hydrodynamic lubrication model. On this basis, it accomplished the integration of the above models. Under the high temperature lubrication of Reynolds, equivalent temperature of the piston and cylinder liner was derived. Then established3D solid model of a piston and cylinder, main bearing using three-dimensional drawing software Pro/E, and imported into the finite element analysis software ANSYS to generate finite element model. At the same time, it combine finite element to obtain dynamics reduction, according to the liner and piston under temperature loads and thermal deformation, with the multi-body dynamics simulation software AVL to simulate the piston cylinder system and main bearing, connecting rod bearing simulation for high temperature lubrication, it studied theoretical calculation of the thermal elasto hydrodynamic lubrication of the bearing (TEHD). The main bearing lubrication condition of gear is analyzed, and compared the calculation method of TEHD and EHD algorithms by considering the effect of temperature, at last some valuable conclusions are obtained in considering the effect of temperature and not under the two different conditions of movement.