Analysis Of Vibration Dynamic Characteristics Of Forklift Drive

Forklift as one kind machinery for material handling, has the advantages of compact structure, flexible steering, applicability for various places, and ability of loading and unloading goods directly, so it is widely used in some conditions for loading, unloading and handling, for example, manufacturing workshop, warehouse, goods stacking ports, station and other places for, etc. Benefit from the market demand for forklift products, constantly updated technology and continuous consumers’ demand for products; manufacturers should pay more attention to the forklift products performance of safety and comfortableness. Drive bridge as one of the main bearing parts during the forklift operation, the characteristics of high work load, serious load change and its dynamic characteristics is important for improving the working efficiency and the service life of the parts. Therefore, vibration characteristics of the drive axle assembly can improve the performance of the forklift.This paper takes the counter balanced forklift truck driving axle as the research object. First of all, based on the main technical parameters of forklift and transmission system, the paper designed and calculated transmission system parameters of forklift structure and components; completed modeling of the driving axle assembly parts for 3D model by using Solid Works software, and the whole assembly and interference inspection. Secondly, based on multi-body dynamics theory and the virtual prototype technology, considering flexible effect of bridge shell and half of drive shaft, the paper built the rigid flexible coupling dynamic model for the driving axle drive system assembly with finite element analysis software ANSYS and dynamics analysis software ADAMS. The paper also conducted the motion analysis and dynamic simulation and the basic agreement of the simulation results and theoretical calculation contrast validated the correctness of the dynamic model. Again, based on the built model, considering the main reducer in drive axle of forklift arc bevel gear, it researched the influence of accuracy by the installation error. Then based on Hertz contact theory, it discussed different torque and speed as well as by the engine power fluctuations with the ADAMS/View analysis of the dynamic characteristics analysis of contact mesh displacement deviation of different installation center distance. Next, it summarized these factors influence degree on the shaft torsional vibration and torsional vibration effect of driving axle half shaft output. It provides the basis and direction for research of driven axle drive system vibration transfer rules and the vibration and noise reduction scheme.