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1. (WO2018220554) FAULT-TOLERANT ELECTROMECHANICAL LINEAR ACTUATOR

Pub. No.:    WO/2018/220554    International Application No.:    PCT/IB2018/053852
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 31 01:59:59 CEST 2018
IPC: F16H 25/20
F16H 25/22
Applicants: UMBRAGROUP S.P.A.
Inventors: BORGARELLI, Nicola
PIZZONI, Luciano
NARDESCHI, Marco
D'ANDREA, Moreno
BOCCALI, Giuliano
Title: FAULT-TOLERANT ELECTROMECHANICAL LINEAR ACTUATOR
Abstract:
The present disclosure relates an electromechanical linear actuator (1) of the type comprising a containment structure (2), a pushing member (3) designed to translate relative to the containment structure (2) to at least partially project out of the containment structure during operation of the actuator, a mechanical reduction apparatus (4) disposed in the containment structure (2) and rotating about an axis of rotation (X), motor means (5) arranged in the containment structure (2) and operably connected with the mechanical reduction apparatus (4) to rotate it about the axis of rotation (X), a shaft (6) inserted in the mechanical reduction apparatus (4) and connected to the pushing member (3), the shaft (6) being mechanically connected with the mechanical reduction apparatus (4) such that a rotational movement of the mechanical reduction apparatus (4) will cause a translational movement of the shaft (6) along the axis of rotation (X) and a rotation-preventing mechanism (7) operable on the shaft (6) to prevent rotation of the shaft (6) about the axis of rotation (X), the mechanical reduction apparatus (4) comprising first and second lead nuts (8, 9), independent of each other and each having its own thread and its own thread direction, the first and second lead nuts (8, 9) being able to rotate about said axis of rotation (X) under the action of the motor means (5) and coupling means (10, 15, 11) configured to mechanically couple the first and a second lead nuts (8, 9) with the shaft (6), such that a rotational movement of the first and/or second lead nuts (8, 9) will cause a translational movement of the shaft (6) along the axis of rotation (X). The linear actuator (1) is characterized in that the coupling means (10, 15, 11) comprise an intermediate coupling stage (10) inserted in the first and second lead nuts (8, 9), respective first mechanical connection means (15) for coupling the intermediate coupling stage (10) with each lead nut (8, 9), second mechanical connection means (11) and the shaft (6) is inserted in the intermediate coupling stage (10) and is connected therewith via the second mechanical connection means (11).