Simulation analysis of influence law of operating parameters on dynamic load of main bearing of IC engine
                                        DU Xiangning1, ZHANG Yanyan2, HUANG Rui2, YU Xiaoli2, LIU Zhentao2
(1.Weichai Power Company Limited, Weifang 261061, China; 2.Power Machinery &Vehicular Engineering Institute, Zhejiang University, Hangzhou 310027, China)

Abstract: In order to reveal the influence law of the operating parameters on the dynamic load of the main bearing of the internal combustion（IC）engine in service, create the basis for the full life cycle load control strategy of it, a coupled model of multibody dynamics and the oil film lubrication model of the main bearing of a certain type of gasoline engine was established. Under the conditions of increasing clearances and difference operating parameters during service, the simulation calculation was carried out by the steadystate theoretical, and the influence laws were analyzed and summarized correspondingly. The results indicate that the total force of the bearing rises at first and goes down latter with the increase of the engine speed, while the maximum total pressure goes on the contrary. The increasing axial force magnification factor drives the total force up, while the maximum total pressure drop first then goes up. The increase of clearance cause both two indexes to rise. The load condition can be eased by improved load control strategy through matching the input load and engine speed appropriately during service.

Key words: internal combustion（IC）engine in service; sliding bearing; dynamic load; optimum clearance; dynamics simulation modeling