Study On Dynamics And Lubrication Of Rolling-sliding Bearing Under Heavy Load Impact

Rolling-sliding bearing is a new type of bearing evolved from roller bearing.It cancels the cage of roller bearing and adds slide block structure between rolling bodies,so as to achieve the purpose of collaborative bearing of roller and slide block and improve the bearing capacity and service life of bearing.In order to explore the working performance of the rolling-sliding bearing under the load impact condition,this paper takes the rolling-sliding bearing as the research object,uses the simulation software to analyze the heavy load contact and impact dynamics of the rolling-sliding bearing,and makes a comparison with the rolling bearing;establishes the lubrication numerical model of the rolling-sliding bearing and the rolling bearing under the load impact,and makes a comparative analysis,discusses the rolling-sliding bearing The lubrication performance of roller is affected by impact load.The main work is as follows:Firstly,according to the different bearing forms of rolling-sliding bearing and roller bearing,the static contact of the two kinds of bearings is established by ANSYS Workbench finite element software.The stress characteristics of the contact surface and the stress distribution law of the rolling-sliding bearing under heavy load are simulated and analyzed.The simulation results show that the larger point of contact stress of bearing body is concentrated on the sub surface of contact surface,and the collaborative bearing of roller and slider can effectively reduce the contact stress of roller;with the increase of bearing value of rolling-sliding bearing heavy load,the maximum stress of roller increases rapidly,and the position of maximum stress of rolling-sliding bearing is transferred from slider to roller.Secondly,in order to study the anti impact performance of the rolling-sliding bearing and simulate the impact load on the bearing,the numerical model of the wheel flat scar impact system is established.The dynamic simulation of the rolling-sliding bearing and the roller bearing is carried out by using ADAMS dynamics software,and the magnitude and change rule of the displacement amplitude of the inner ring of the bearing under the impact of different rotational speeds are obtained,as well as the internal support element of the bearing under the impact The maximum stress of the piece.The results show that the higher the rotating speed is,the greater the impact force of the model is,the more obvious the inner race runout of the bearing is,and the force of the bearing elements inside the rolling-sliding bearing is less than that of the roller bearing;the higher the rotating speed of the rolling-sliding bearing is,the more unfavorable the coordination between the roller and the slider is,and the lower the rotating accuracy is.Finally,the lubrication performance of rolling-sliding bearing under impact load is studied.Considering the elastic deformation of roller,the numerical calculation model of elastohydrodynamic lubrication of roller bearing under isothermal condition is established.The influence of impact load on the pressure and thickness of roller elastohydrodynamic lubrication oil film of rolling-sliding bearing and roller bearing is analyzed.The results show that the effect of impact load can reduce the thickness of oil film,and the pressure of oil film is the second When the peak value disappears,the oil film thickness will increase with the increase of the viscosity and speed of the lubricating oil.The impact load will produce the squeeze effect oil film.The larger the impact frequency is,the larger the squeeze effect oil film thickness is,the larger the impact amplitude is,and the lower the squeeze effect oil film thickness is.