| 摘要 |
A ball screw is provided having a ball roller screw ( 1 ) and a screw nut ( 2 ) arranged thereon, whereby the balls ( 3 ) are arranged to endlessly circulate in a ball channel ( 6 ) defined by ball tracks ( 4, 5 ) on the ball roller screw ( 1 ) and the screw nut ( 2 ). The ball channel ( 6 ) includes a load section ( 7 ) wound about the ball roller screw ( 1 ), the beginning and end of which are endlessly connected by a load-free return section ( 8 ). A minimum of two and a maximum of four balls ( 3 ) are housed in a common ball cage ( 10, 22 ), the cage pockets ( 11 ) of which each house one of the balls ( 3 ), whereby the ball cage ( 10, 22 ) includes discs ( 12, 15 ) at the axial ends thereof and between adjacent balls ( 3 ), that engage the ball channels ( 4, 5 ), and provided on the sides thereof facing the balls ( 3 ) with a concave receptacle ( 14 ) for the balls ( 3 ).
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