The elastohydrodynamic lubrication theory was used to study the elastohydrodynamic lubrication problem of swing movable teeth transmission. A set of equations for elastohydrodynamic lubrication of swing movable teeth transmission were established. A numerical method for solving the elastohydrodynamic lubrication problem of the transmission was put forward. The results showed that the calculation formula and the numerical calculation method of the elastohydrodynamic lubrication of swing movable teeth drive are correct and effective; the lubrication oil film thickness increases with the decrease of the load，with the increase of the synthetic curvature radius and entrainment velocities; the change law of the oil film thickness between a movable tooth and the internal gear is that the oil film thins gradually during the former half of a mesh period and thickens gradually during the latter half of a mesh period,the oil film is thinnest near point of inflection.Near the point of inflection, fatigue pitting or wear occurs easily.The research results can be used as a theoretical basis for the tribology design of swing movable teeth drive.
