| 摘要 |
A mechanism for transforming a rotational movement into a linear movement, comprising a non-deformable nut, that is prevented from rotating but not from axially moving, a radially deformable tubular screw, having freedom of rotation but not of axial movement and having a pitch equal to that of the nut but of a slightly external smaller diameter than the internal diameter of the nut. A pushing device inside the screw, with the ability to rotate and to push against the internal wall surface of the screw at least at three circumferentially equidistant points so as to radially deform the screw wall outwards, until bringing the screw wall to rest against and screw into the nut at an equal number of points. The pushing device may be constituted of independent rolling elements like rolling bearings on a core on a support or may be a cam in contact with the screw or through rolling elements.
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