Dynamic Modeling And Efficiency Study Of Cylindrical Spur Gear System Based On Tooth Surface Deviation And Micro-topography

Gear transmission mechanism has the advantages of large transmission power,large speed ratio range,stable transmission ratio,long service life and compact structure,and is widely used in defense industry,energy and transportation industries.The transmission efficiency of gear system is an important index to measure the performance of transmission system,which has an important impact on the dynamic performance of transmission system and energy saving and consumption reduction.Because the gear transmission system inevitably has the tooth surface deviation and the tooth surface micro-morphology,but the traditional gear system efficiency calculation method does not consider the influence of the tooth surface deviation and the tooth surface micro-morphology.Aiming at the problem of gear transmission efficiency under the influence of tooth surface deviation and tooth surface micro-morphology,the influence of tooth surface deviation on meshing stiffness,load distribution and vibration characteristics is analyzed by combining theoretical analysis,dynamic modeling and experimental verification.An efficiency calculation method considering the influence of measured tooth surface micro-morphology and tooth surface deviation is put forward,which is verified by the construction of test bench.The accuracy of the dynamic model and the efficiency calculation model is discussed.The main research contents are as follows :(1)In view of the fact that the traditional gear efficiency calculation model does not consider the influence of tooth surface deviation on meshing stiffness,normal load and the ratio of single and double teeth,the meshing stiffness and error coupling excitation model of tooth surface deviation is established.The influence of tooth surface deviation on meshing stiffness,gear load distribution coefficient,load transfer error and no-load transfer error is analyzed.(2)In order to obtain the dynamic meshing force under the influence of tooth surface deviation,a six-degree-of-freedom dynamic model of translation-torsion coupled with error excitation,meshing stiffness excitation and friction excitation was established.The influence of tooth surface deviation on vibration characteristics was analyzed.The vibration test of gears was carried out to verify the accuracy of the dynamic model.(3)n view of the fact that the traditional friction coefficient calculation model does not consider the influence of the micro-morphology of the tooth surface,a calculation model of the friction coefficient of the mixed lubrication tooth surface considering the measured micro-morphology of the tooth surface is established,and the influence of the tooth surface deviation and micro-morphology on the friction characteristics of the tooth surface is analyzed..(4)For the traditional gear meshing power loss model ignores the influence of different tooth surface deviation anisotropy and single or double tooth interval ratio,the average power loss on a meshing line is taken as the gear meshing power loss.In this paper,a calculation model of gear transmission efficiency considering the influence of tooth surface deviation anisotropy and the ratio of single and double teeth intervals is established,and the influence of tooth surface deviation on transmission efficiency and power loss is analyzed.(5)A gear efficiency test-bed was built to obtain the gear transmission efficiency under different tooth surface deviations and working conditions.The relative errors between simulation results and experimental results were compared to verify the accuracy of the efficiency calculation model.