The prediction of load distribution in four-row cylindrical roller bearings under the elastohydrodynamic lubrication based on boundary element method

摘要

In order to get the prediction of load distribution in four-row cylindrical roller bearing under the elastohydrodynamic lubrication (EHL), a new bearing Boundary Element Method (BEM) is proposed, which is based on the elastic contact BEM and EHL theory. Firstly, the basic theories of the bearing BEM are introduced. Secondly, the basic equations of the EHL theory of finite length line contact are described, and the calculation program is compiled by the Finite Difference Method (FDM), by which the EHL characteristics of four-row cylindrical roller bearing under smooth condition are analyzed. Thirdly, the thickness of lubricant oil film and the surface roughness are coupled with the boundary integral equation in the form of contact clearance, and also the friction coefficient equation derived by EHL theory. The boundary integral equation of bearing BEM under the EHL condition is established, and the calculation program is compiled. Then, load and pressure distributions of a four-row cylindrical roller bearing are simulated numerically under different surface roughness conditions. Finally, the load distribution of the four-row cylindrical roller bearing is tested, and the experimental data and the simulation results are compared, which proves the validity and effectiveness of the new bearing BEM.