Study of coupling dynamics between crankshaft and
timing drive system of engine
LI Yi-min1,HAO Zhi-yong1,DU Ji-sheng2
1.Department of Energy Engineering, Zhejiang University, Hangzhou 310027,China;
2.Department of Electrical Engineering, Southeast University,Nanjing 210096,China
A multi-elastic body dynamic model of crankshaft was established to investigate the coupling effect between crankshaft and timing drive system of engine. The crankshaft torsional vibration, dynamic stress in fillet of crank web and elastic hydrodynamic (EHD) results of main bearing were obtained. A multi-body dynamic model of timing drive system was established separately to analyze the synchronous belt internal force and mesh force between belt and pulleys. The crankshaft and the timing drive system were coupled by co-simulation to consider the interaction of force, moment and displacement of the timing pulley. And then the coupling dynamic results between crankshaft and timing drive system were obtained. Results show that the crankshaft torsional vibration amplitude increases slightly with the coupling effect, the maximum oil film pressure increases while the minimum oil film thickness decreases with the first main bearing bending moment variation, and the maximum dynamic stress in fillet of first crank web increases by 3.9%. However, the dynamic of timing drive system is little influenced by the crankshaft. Torsional vibration test validated that the coupling model is more consistent with the actual engine working conditions than the uncoupling model.
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