Novel toroidal worm-gearing with spherical enveloping element is a kind of movable teeth transmission technology constituted mainly by worm

steel ball and worm gear.According to the transmission theory and the feature of tooth profile

in the situation that the friction and the friction moment are considered

the velocity and the forced action are analyzed by treating the steel ball as the separate object.Based on these

the formula of meshing efficiency is deduced

the effect rules of design parameter on the efficiency are analyzed

and the feasibility of the meshing efficiency formula is validated by the efficiency test of the prototype.