Ball screw drive for electromechanical power steering of motor car, has ball inlet and ball outlet that are engaged with groove through nut, and supporting portions that are supported on ball inlet and ball outlet through nut

摘要

The ball screw drive (1) has a traction wheel (7) and detour that is provided with return channel. A main detour portion (10a) is positioned at inner circumference of traction wheel. An auxiliary detour portion (25a) is connected to latter in assembly position. The wheel portions are connected with ring mold (8a), and each detour portion is set with ball inlet portion (12a) and ball outlet portion (13a). A ball inlet (17a) and ball outlet are engaged with groove (6) through a nut (4). Supporting portions (26a) are supported on ball inlet and ball outlet through nut.