Tribology design methods are applied in the design of ball globoidal cam

and the calculation formulae of EHD oil film thickness between steel ball and cam raceways are deduced.That the film thickness ratio used in judging lubrication state is adopted as design criteria for ensuring lubrication state.In order to prevent lubrication failure caused by oil film high temperature

by viscosity-temperature characteristics of lubrication oil

the oil film thickness reduction factor is calculated amending oil film thickness calculating in normal temperature.Strength Design and pressure angle are calculated for satisfying with service performance

and the frictional wear is decreased.