Roller screw

摘要

The roller screw mechanism is provided with a screw including an external thread, with a nut arranged about and coaxial with said screw, the nut including an internal thread, and with a plurality of rollers inserted between the screw and the nut and each including an external thread engaging the external and internal threads of said screw and of said nut. The screw is axially moveable in relation to the rollers. The flanks of the thread of the screw have a concave profile in cross section.

主权项

1. A roller screw mechanism comprising,
a screw having an external thread, a nut arranged about and coaxial with said screw, the nut including an internal thread, and a plurality of rollers inserted between the screw and the nut, each including an external thread engaging the external and internal threads of said screw and of said nut, wherein the screw or the nut forms an element axially moveable in relation to the rollers, and wherein the flanks of the thread of said moveable element have a concave profile in cross section, wherein each flank of the thread of the moveable element is formed from a circle arc, wherein the axially opposite flanks of the thread are formed from two circle arcs which are symmetrical in relation to a radial plane, and the wherein the axial spacing of the centers of the circle arcs is between 10% and 45% of the radius of the circle arcs.