Ball screw transmission for electric motor-power steering of motor vehicle, has balls contacting threaded spindle and nut at points of contact located in region near gap defined between threaded spindle and nut

摘要

The transmission (30) has a nut (32) arranged on a threaded spindle (31), and a set of balls (33) arranged behind the other in the thread of the threaded spindle. The balls arranged on linear careers roll-off on the threaded spindle and on the nut. The balls contact the threaded spindle and the nut at points of contact (34, 35, 36, 37) located in a region near a gap (38) defined between the threaded spindle and the nut. The thread of the threaded spindle and the nut has a steep flank angle within the region near the gap existing between the threaded spindle and the nut.