Linear electro-mechanical actuator with built-in anti-rotation

摘要

A linear electro-mechanical actuator, includes a containment structure (2), one or two pushers facing each other (7), a nut (5) rotatable about an axis (X) driven by a driving force, a screw shaft (6) inserted in the nut (5), connected to the pushers and interconnected with the nut (5) via a helical recirculating ball coupling (5a, 6a), and an anti-rotation mechanism (8) acting on the screw shaft (6) to prevent the screw shaft (6) from rotating about the axis (X). The anti-rotation mechanism (8) includes a pair of fixed guide bars (9), coupled in a sliding fashion with the screw shaft (6) and extending along a direction parallel to the axis (X) and spaced from the axis (X).

主权项

1. A linear electro-mechanical actuator with built-in anti-rotation, comprising:
a containment structure (2); at least one pusher designed to translate relative to the containment structure (2) in such a way that it at least partly comes out of the containment structure (2) during actuator (1) operation; a nut (5) located in the containment structure (2) and able to rotate about an axis (X) driven by a driving force; a screw shaft (6) inserted in the nut (5) and connected to the pusher, the screw shaft (6) being interconnected with the nut (5) by means of a helical recirculating ball coupling (5a, 6a) in such a way that a rotation of the nut (5) causes a translation of the screw shaft (6) along the axis (X); an anti-rotation mechanism (8) acting on the screw shaft (6) to prevent the screw shaft (6) from rotating about said axis (X); characterised in that the anti-rotation mechanism (8) comprises at least one guide bar (9) fixed to the containment structure (2) and coupled in a sliding fashion with the screw shaft (6), the guide bar (9) extending along a direction parallel to the axis (X) and spaced from the axis (X),
wherein the at least one guide bar (9) is shaped in such a way as to have at least one rolling track (12) and wherein the anti-rotation mechanism (8) also comprises at least one recirculating ball screw (11) interposed between the rolling track (12) and an inner portion of the screw shaft (6), andwherein at least one guide bar (9) has two rolling tracks (12) facing each other and wherein the anti-rotation mechanism (8) also comprises recirculating ball screws (11) each or which interposed between a respective rolling track (12) and the inner portion of the screw shaft (6).