Analysis Of The Influence Of Tooth Surface Pits Morphology On The Elastohydrodynamic Lubrication Of The Face-gear

Face-gear drive has a large degree of coincidence,high loading capacity,compact structure can reduce the weight of the transmission system,the advantages of good shunt characteristics.Is gradually used in the armed helicopter transmission system instead of the original bevel gear transmission.Armed helicopter with fast speed,good flexibility,large load capacity and other characteristics,which will have a high demand for the transmission system,so the face-gear will often work in harsh conditions.In recent years,researchers at home and abroad have studied the micro topography of the surface of the friction pairs to improve the tribological properties of the mechanical components.in order to improve the service life of the gear surface and improve the lubrication characteristics.Micro pits were machined on the surface of the gear teeth,and the effect of micro pits on the lubrication of gears was studied.The main research contents are as follows:Based on the surface of loaded tooth contact analysis of the face-gear meshing track,curvature radius and the entrainment velocity and by ABAQUS finite element simulation calculation shows that the method of face-gear contact force.The influence of micro pits on the tooth surface normal contact force is analyzed.The face-gear isothermal point contact elastohydrodynamic lubrication model was established,The basic equations are dimensionless,by means of finite difference method discretization of the dimensionless equation,using the FORTRAN program,get the minimum oil film thickness in the process of face-gear drive along the meshing line from the tip of the tooth to tooth root is gradually increasing,analysis of the tooth face micro pit diameter and depth of the minimum oil film thickness influence.Based on the isothermal elastohydrodynamic lubrication joined the thermal effect,draw the face-gear tooth surface maximum temperature rise from the tip of the tooth to tooth root was decreased first and then increased distribution and reaches its maximum at the top of the teeth,middle of the smallest is almost zero,analysis the influence of micro pit morphology with different parameters,and with the isothermal solution of minimum oil film thickness were compared.The RC-GX series laser marking machine.The surface of the face-gear tooth morphology,the use of YDX9550 A type gear tester and HHS type pressure sensing paper measuring the contact pressure of the meshing process,verify the correctness of the finite element simulation result.The meshing temperature of face-gear of tooth surface with three different micro pits was measured by infrared temperature measuring instrument,The appropriate tooth surface micro pits of face-gear can reduce the tooth surface temperature rise,which is consistent with the theoretical calculation of the trend.