Abstract: In order to improve the lubrication condition of high pair contact parts in point contact, the lubrication oil film in Hertz contact zone was studied. Coupled with contact mechanics and hydrodynamic lubrication equations, the multigrid method and Fortran language programming were used to solve the equations of EHL of isothermal point contact, and the curves of film thickness and pressure with different ellipticity Ke, load w,entrainment velocity u and viscosity η0 were obtained. By studying the position of minimum film thickness and secondary pressure peak and the change degree of film thickness and pressure in the process of changing of film thickness and pressure, the factors affecting the change law of oil film in Hertz contact zone were obtained and analyzed. The results indicate that the contact ellipse changes with the change of ellipticity, load, entrainment velocity and viscosity, and the change of contact ellipse affects the film thickness and pressure of lubrication oil in varying degrees. In a certain range, increasing ellipticity, entrainment velocity and viscosity and reducing load are beneficial to improving lubrication performance.

Key words: elastohydrodynamic lubrication（EHL）; ellipticity; load; entrainment velocity; viscosity