| 摘要 |
Screw actuator (1, 71), in particular brake actuator, comprising a hollow screw (14, 45, 51, 63, 74) which is driven in rotation and a nut (10, 72) which can thereby be displaced in the axial direction and in the case of a brake actuator acts as a piston (19). Rotary elements (23) are accommodated in the grooves delimited between screw and nut. There are means for recirculating these rotary elements. These means comprise a recess (47, 52, 58, 64) in the screw. This recess decreases in size in the direction towards the center axis of the grooves. This recess may comprise a wall aperture between two adjacent screws. It is also possible to arrange a tube which connects two recesses of this type. A further option consists in fitting an insert part in a recess in the screw. |
