The lubrication condition between the meshing teeth of filtering reducer is complex due to multiteeth contact.In order to solve this problem,an elastohydrodynamic lubrication (EHL) model of filtering reducer was established.The un-uniformed load distribution,detailed realistic contact geometry gap,and the machined surface roughness were all considered in the model.A complete numerical solution was achieved with the Newton-Raphson method(FEM).The hydrodynamic pressure and film thickness of lubricant along the line of action were calculated and the effect of teeth surface roughness to the lubrication property was also obtained.The results showed that the hydrodynamic pressure and the film thickness vary with disturbance and mutation along the line of action,the film thickness decreases and the lubrication status becomes worse when the surface roughness is taken into account.Hydrodynamic pressure and film thickness exist little difference between the sine wave shape roughness surface and the realistic machined roughness surface,and sine wave shape roughness is acceptable to model the machined roughness to some extent.
