Ball transmission for machine tool has rolling radius of each ball in the nut's groove superior to the rolling radius of each ball in the screw's groove

摘要

Transmission comprises a nut (20) and screw (12) assembly with balls (28) placed in between a groove (16) of the screw and a groove (24) of the nut. The rolling radius of each ball in the nut's groove (ra) is superior to the rolling radius of each ball in the screw's groove (ri) when each radius is calculated relatively to the ball's rotation axis (D).