An actuator for a member of a land motor vehicle, of the type including an actuator casing (12) which delimits an internal volume in which are arranged:
- at least one electric motor (16) having a motor output part (20), the motor output part having an axis of rotation (A1),
- and a mechanical transmission (18) comprising at least one reduction gear train (22) to transmit a motion of the motor output part (20, 20′) of the electric motor (16) to a output mechanical connector (24) of the actuator (10),
- of the type in which the reduction gear train (22) includes at least one epicyclic gear stage (28, 28.1, 28.2,), having an input component (30.1) and an output component (36.2) which are rotatable relative to the casing about a main axis (A2), and at least one set of planet gear wheels (34.1, 34.2), the speed of rotation of the input component (30.1) being greater than the speed of rotation of the output component (36.2),
- of the type in which the input component (30.1) is mechanically connected to the motor output part (20, 20′) by a mechanical connection which is arranged, along the direction of the main axis (A2), behind the at least one set of planet gear wheels (34.1, 34.2) along the direction of the main axis (A2), and the output mechanical connector (24) is intended to be connected to the member of the land motor vehicle by a mechanical connection towards the front of the at least one set of planet gear wheels along the direction of the main axis (A2),
- of the type including an angular position sensor (42) including a detector (44) and a target (46),
- of the type in which the target (46) of the angular position sensor (42) is arranged, along the direction of the main axis (A2), behind the at least one set of planet gear wheels (34.1, 34.2) along the direction of the main axis (A2) of the epicyclic gear stage (28, 28.1, 28.2) and is mounted in a secured manner on a connecting rod (52) which is secured in rotation to the output mechanical connector (24) of the actuator (10);
- and which axially passes through the epicyclic gear stage (28, 28.1, 28.2) along its main axis (A2),
- characterized in that the input component of the epicyclic gear stage is guided in rotation on the connecting rod (52) with a first positive diametrical guide clearance (“jg1”) relative to the main axis (A2),
- in that the output component of the epicyclic gear stage is rigidly connected to the connecting rod (52),
- in that at least one fixed component of the epicyclic gear stage is connected without clearance to the actuator casing (12),
- and in that the input component (30.1) and the output component (36.2) of the epicyclic gear stage (28) belong to a rotatable assembly of the epicyclic gear stage (28) which is positioned relative to the actuator casing (12), diametrically relative to the main axis (A2), with a positive diametrical displacement clearance (“jd”) relative to the main axis (A2), the diametrical displacement clearance (“jd”) being at least 3 times greater than the first diametrical guide clearance (“jg1”).