Establishment And Analysis Of Finite Element Model For Main Bearing Composite Structure Of A V-Type Internal Combustion Engine

Power density is one of the most important performance indicators of internal combustion engines.Increasing power density has become an inevitable trend in the power development of internal combustion engines.With the increase of power density,the load on the internal combustion engine will also be greatly increased,which puts forward higher requirements for the strength and stiffness of the internal combustion engine.In this background,this topic took a V-type internal combustion main bearing composite structure as the research object,applied finite element theory,carried out finite element simulation analysis,and explored its strength and stiffness under high load.According to the structural characteristics of a V-type internal combustion engine,two different schemes were designed to control the calculation scale to simplify the main bearing combination structure.Different schemes were introduced into ABAQUS for finite element meshing,and different finite element models were established.In ABAQUS,reasonable boundary constraints and load constraints were applied to the finite element models of different schemes.The results show that the simplified model of single diaphragm was in good agreement with the original model in the first principal stress,equivalent stress and main bearing hole deformation.Then the worst working condition of internal combustion engine was selected.Static calculation was carried out for the single baffle main bearing combination structure.Static stress and deformation nephograms of the main bearing combination structure under different load conditions were obtained respectively.Through the analysis of stress and deformation nephogram,the maximumstress of the main bearing composite structure under different load conditions was obtained.Then,according to the maximum stress at this point,the strength was checked based on the strength theory,and the safety factors of tension and compression of the main bearing composite structure were analyzed and calculated.The results show that the safety factor of side wall reinforcement was the lowest under different load conditions,which belongs to dangerous area.Some improvement measures and suggestions were put forward,such as increasing the width of side wall reinforcement and setting reasonable transition corner at the root of reinforcement.The roundness of the main bearing hole was calculated by least square circle method,the results show that the roundness of the main bearing hole was unevenly distributed along the axis under different load conditions.In view of the large deformation in this area,the improvement measures to increase the thickness near the bolt hole of the main bearing of the block were put forward.