Abstract:Numerical analyses about sudden stop of zeroentrainment line contact elastohydrodynamic lubrication(EHL),which is common in ball screw,ball worm and roller bearing without cage,was carried out to investigate the pressure,the film thickness and the temperature of the oil film under different initial zeroentrainment surface velocities and suddenstop times.The results show that under the same sudden stop time,the central pressure and central film thickness are increased in the process of the sudden stop,and decreased slightly when initial 〖JP〗zeroentrainment surface velocity is increased.The central pressure and central film thickness are increased as the suddenstop time increases if the initial zeroentrainment surface velocity is identical.The temperature peak of the oil film is decreased slowly at first but rapidly decreased at the last stage of the sudden stop.Sudden stop of zeroentrainment causes the central pressure increase dramatically,therefore,plastic deformation happens in both two surfaces because stress surpasses the yield limit of steel,which leads to surface damage.