Abstract: The system comprises a roller screw mechanism 12 which is provided with a screw 16 which comprises at least a first outer threaded portion 18, a nut 20 and a plurality of rollers 24 which cooperate with the first outer portion 18 and an inner thread of the nut. The system further comprises a roller thrust bearing 14 which is mounted on a second outer portion 52 of the screw and which is provided with a bushing 50 and a plurality of rollers 56 which comprise flanks which cooperate with flanks of the second outer portion 52 of the screw and the bushing 50. The flanks of the screw, the bushing and the rollers are configured so that, during a rotation of the screw, the rollers 56 are fixed axially relative to the screw 16 and relative to the bushing 50.

Abstract: 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.

Abstract: The roller screw mechanism is provided with a screw comprising an external thread, with a nut arranged around and coaxial with the said screw, the nut comprising an internal thread, and with a plurality of rollers interposed between the screw and the nut and comprising flanks interacting with the said threads. The value of the opening angle ? of the flanks of the external thread of the screw is greater than the value of the opening angle of the flanks of the rollers.

Abstract: The system comprises a roller screw mechanism 12 which is provided with a screw 16 which comprises at least a first outer threaded portion 18, a nut 20 and a plurality of rollers 24 which cooperate with the first outer portion 18 and an inner thread of the nut. The system further comprises a roller thrust bearing 14 which is mounted on a second outer portion 52 of the screw and which is provided with a bushing 50 and a plurality of rollers 56 which comprise flanks which cooperate with flanks of the second outer portion 52 of the screw and the bushing 50. The flanks of the screw, the bushing and the rollers are configured so that, during a rotation of the screw, the rollers 56 are fixed axially relative to the screw 16 and relative to the bushing 50.

Abstract: 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.

Abstract: The roller screw mechanism is provided with a screw comprising an external thread, with a nut arranged around and coaxial with the said screw, the nut comprising an internal thread, and with a plurality of rollers interposed between the screw and the nut and comprising flanks interacting with the said threads. The value of the opening angle ? of the flanks of the external thread of the screw is greater than the value of the opening angle of the flanks of the rollers.