An actuator for a member of a land motor vehicle, the actuator having an actuator casing which delimits an internal volume, comprising:
- at least one electric motor having a motor output part, the motor output part having an axis of rotation, and
- a mechanical transmission comprising at least one reduction gear train to transmit a motion of the motor output part of the electric motor to a output mechanical connector of the actuator,
- wherein the at least one reduction gear train comprises at least one epicyclic gear stage having an input component that has a speed of rotation, and an output component that has a speed of rotation, the input component and the output component, which are rotatable relative to the casing about a main axis having a direction and at least one set of planet gear wheels, the speed of rotation of the input component being greater than the speed of rotation of the output component,
- wherein the input component is mechanically connected to the motor output part by a mechanical connection which is arranged, along the direction of the main axis, behind the at least one set of planet gear wheels along the direction of the main axis, and the output mechanical connector is intended to be connected to the member of the land motor vehicle by a mechanical connection towards a front of the at least one set of planet gear wheels along the direction of the main axis,
- an angular position sensor including a detector and a target,
- wherein the target of the angular position sensor is arranged, along the direction of the main axis, behind the at least one set of planet gear wheels along the direction of the main axis of the epicyclic gear stage and is mounted in a secured manner on a connecting rod which is secured in rotation to the output mechanical connector of the actuator;
- and which axially passes through the epicyclic gear stage along its main axis,
- wherein the input component of the epicyclic gear stage is guided in rotation on the connecting rod with a first positive diametrical guide clearance relative to the main axis,
- wherein the output component of the epicyclic gear stage is rigidly connected to the connecting rod,
- wherein at least one fixed component of the epicyclic gear stage is connected without clearance to the actuator casing, and
- wherein the input component and the output component of the epicyclic gear stage belong to a rotatable assembly of the epicyclic gear stage which is positioned relative to the actuator casing, diametrically relative to the main axis, with a positive diametrical displacement clearance relative to the main axis to limit a diametrical displacement of the rotatable assembly of the epicyclic gear stage relative to the actuator casing, the diametrical displacement clearance being at least three times greater than the first diametrical guide clearance,
- wherein the at least one epicyclic gear stage comprises an epicyclic train including a first gear wheel and a second gear wheel each having a symmetrical axis of revolution which coincides with the main axis, and including at least one set of planet gear wheels mounted in free rotation on a planet gear carrier, and in that the planet gear carrier forms the output component of the epicyclic gear stage.