US 12,246,687 B2
Electromechanical actuator for a vehicle brake with increased service life
Gérard Luu, Noisy le Grand (FR); Christophe Dupas, Pornic (FR); Alberto Molinaro, Yokohama (JP); Cédric Guignon, La Queue en Brie (FR); and Marc Ayache, Paris (FR)
Assigned to HITACHI ASTEMO FRANCE, Drancy (FR)
Appl. No. 17/596,150
Filed by HITACHI ASTEMO FRANCE, Drancy (FR)
PCT Filed Jun. 5, 2020, PCT No. PCT/FR2020/050961
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/245548, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 1906067 (FR), filed on Jun. 7, 2019.
Prior Publication US 2022/0227346 A1, Jul. 21, 2022
Int. Cl. B60T 13/74 (2006.01); F16D 65/18 (2006.01); F16D 121/24 (2012.01); F16D 125/40 (2012.01)
CPC B60T 13/741 (2013.01) [F16D 65/18 (2013.01); F16D 2121/24 (2013.01); F16D 2125/40 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An electromechanical actuator for an automobile vehicle brake comprising an electric motor drawing a current of rated intensity, and a screw-nut motion converter including:
a driving element among a screw with an axis extending along a longitudinal direction and a nut carried by the screw, the screw and the nut each comprising a thread for cooperating together, and
a driven element corresponding to the other among the screw and the nut, wherein the driving element is rotationally coupled to the electric motor and translationally fixed along the longitudinal direction, and wherein the driven element is rotationally fixed and translationally free along the longitudinal direction, wherein the driven element is configured to move in the longitudinal direction in response to a rotation of the driving element, between a fixed stop corresponding to a fully retracted position of the driven element and a movable stop representing a braking position of the driven element,
wherein at least one singularity is formed on the screw, at a predetermined position along the movement of the driven element along the longitudinal direction, said singularity forming a means for varying the resistance to progress of the driven element to cause a change in the rated intensity of the current flowing through the motor upon when the driven element passes through said predetermined position, and
wherein the singularity is an excess thickness or recessed portion of the thread of the screw bounded between two ends located at a distance from the movable and fixed stops.