Patent ID: 7263908

Claim:
A ball screw, between the spindle nut ( 1 ) and threaded spindle ( 2 ) of which at least one ball chain ( 6 , 8 ) formed from balls ( 9 ) rolls in each case along a ball channel ( 5 ) which is delimited by ball grooves ( 3 , 4 ) formed on the spindle nut ( 1 ) and on the threaded spindle ( 2 ), the ball chain ( 6 , 8 ) being deflected from one end of the ball channel ( 5 ) to a start of this ball channel ( 5 ) in deflection portions of the ball channel ( 5 ), wherein one or more spring elements ( 11 , 17 , 27 , 35 ) arranged in the ball chain ( 8 ) between balls ( 9 ) of the ball chain ( 6 , 8 ) exert a pressure force on the balls ( 9 ) in the axis of the ball chain ( 8 ) wherein the number spring elements ( 11 , 17 , 27 , 35 ) arranged in the ball chain ( 6 , 8 ) is dimensioned such that, during an orbit of the ball chain ( 6 , 8 ), there is always one of the spring elements ( 11 , 17 , 27 , 35 ) in the deflection portion of the ball channel ( 5 ).