Actuator, in particular of electromechanical type

Abstract

The invention relates to an actuator (1) comprising a housing (8) and a rotary output member (5) arranged to provide an actuation torque, the rotary member being rotatable relative to the housing (8) about an axis of rotation (XR) and comprising a first portion (14) and a second portion (15) assembled together, the housing (8) being provided with two opposite axial stops (17, 18), each part of the rotary output member is respectively supported on each axial stop such that, once assembled and supported on the axial stops (17, 18) of the housing, the rotary output member remains axially stationary in the direction of the axis of rotation (XR).

Description

Technical Field

[0001] The invention relates to an actuator, in particular an actuator of the electromechanical type, in particular for use in vehicles, such as motor vehicles.

[0002] The vehicle may be a land vehicle, a sea vehicle or an air vehicle. Background Art

[0003] An electromechanical actuator with an electric motor of the brushless DC motor type is known from patent application DE 10 20 20 12 0 241 A1. The English abbreviation for such a motor is BLDC motor, which stands for brushless DC motor. The actuator is used as a flap actuator in a valve. For control and monitoring purposes, the electric motor of the actuator can be equipped with sensors in order to determine motor parameters, such as the position of the rotor, the speed of the rotor, or the angle of rotation of an actuator element coupled to the rotor.

[0004] The actuator described in this patent application DE102020120241A1 comprises an electric motor of the BLDC type with a stator and a rotor in a housing closed by a cover. A reduction gear train is also provided in order to transmit the torque generated by the motor to an output pinion. The output pinion is formed in one piece with a hollow shaft passing through an opening in the housing in order to be connected to the valve element. A three-branch support member holds the upper end of the output pinion.

[0005] Figure 1 An actuator 100 of a type substantially similar to that described in patent application DE102020120241A1 is depicted in FIG. The actuator comprises an electric motor 101 which drives an output pinion 102 via a gear train (not shown). The pinion 102 comprises a gear 103 and a hollow shaft 104, which are manufactured in one piece. The upper part of the pinion 102 is held in place by a support member 106 which forms a first sliding journal bearing 107 for pivoting. A second bearing 108 for pivoting is present at the lower end of the hollow shaft 104. These bearings 107 and 108 are radial type supports. An axial thrust stop is provided between the output pinion 102 and an annular wall 110 of the housing. Aligning the one-piece component (output pinion / hollow shaft) in the two bearings 107 and 108 requires high precision in the dimensions and positioning of these bearings. This requires strict manufacturing tolerances. Furthermore, the one-piece component pivots in two bearings 107 and 108 and therefore in two locations, creating a greater amount of wear. Furthermore, the presence of the Hall Effect sensor above the magnet carried by the one-piece component (output pinion / hollow shaft) requires the use of a support member 106.

[0006] The present invention particularly seeks to improve the Figure 1 Describe the type of actuator. Summary of the invention

[0007] Therefore, the present invention relates to an actuator, which includes a housing; a rotary output member, which is arranged in a manner to provide an actuating torque, the rotary output member being rotatable relative to the housing about a rotation axis and comprising a first part and a second part assembled together, the housing being provided with two opposite axial thrust stops, each part of the rotary output member being supported on its own axial thrust stop, so that once assembled and supported on the axial thrust stop of the housing, the rotary output member remains axially stationary in the direction of the rotation axis.

[0008] An axial thrust stop refers to a thrust stop that is capable of blocking a translational movement of a rotating component in one of the directions along the axis of rotation.

[0009] Thus, according to the invention, one of the axial thrust stops blocks translational movement in one of the two directions along the axis of rotation, while the other of the axial thrust stops blocks translational movement in the opposite direction along the axis of rotation. These opposite axial stops thus immobilize the rotary output member axially along its axis of rotation, the member being unable to effect translational movement in one direction or the other along its axis of rotation.

[0010] Thus, the rotational output member is able to rotate about its rotational axis but is unable to effect translational movement along this axis.

[0011] By means of the invention, blocking of the translational movement along the rotation axis of the rotating member can be achieved simply by assembling the first part and the second part on the axial thrust stop. For example, there is no need to use additional components, such as Figure 1 The support member 104 in the actuator.

[0012] According to one aspect of the invention, the first portion and the second portion of the rotating member sandwich the axial thrust stop of the housing.

[0013] According to one aspect of the invention, the first portion of the rotary output member comprises a toothed sector, in particular in the form of a gear wheel, configured to cooperate with a complementary gear element. The complementary gear element in particular forms part of a gear train between the electric motor and the rotary output member.

[0014] According to one aspect of the invention, the diameter of the toothed sector, in particular the diameter of the gear wheel, corresponds to the maximum diameter of the rotary output member, this diameter being measured perpendicularly to the axis of rotation.

[0015] According to one aspect of the invention, the second part of the rotary output member comprises a male or female plug-in connector designed to cooperate with an actuating member, in particular of the type designed to perform a valve function.

[0016] According to one aspect of the invention, an actuating member is associated with the valve for selectively adopting an open or closed position with respect to the flow of fluid through the valve.

[0017] According to one aspect of the invention, the second portion of the rotary output member comprises a female plug-in connector formed by a cavity configured to cooperate with the actuating member in order to transmit an actuating torque thereto.

[0018] According to one aspect of the invention, the cavity has a substantially polygonal cross section, such as a hexagonal or octagonal cross section, or has a leaf-shaped cross section designed to receive a correspondingly shaped stem of the actuating member.

[0019] According to one aspect of the invention, the second part is designed to rotate in an output opening of the housing, in particular a circular opening, thereby forming a pivot connection between the second part and the housing.

[0020] According to one aspect of the invention, the second portion of the rotational output member extends through the output opening.

[0021] According to one aspect of the present invention, the second portion is designed to rotate in contact with an inner wall of the output opening of the housing.

[0022] According to one aspect of the invention, the housing and its output opening thus form a plain journal bearing for the second part of the rotating member.

[0023] Thanks to the invention, a single plain journal bearing is required to perform the pivoting function, thereby reducing frictional wear.

[0024] Furthermore, due to the single bearing, the invention allows wider tolerances in the dimensions of the components during manufacturing.

[0025] According to one aspect of the invention, the second portion of the rotary output member comprises a cylindrical barrel engaged in the output opening of the housing.

[0026] According to one aspect of the invention, the housing comprises an inner annular wall provided with a free end, the free end forming one of the axial thrust stops. The annular wall is referred to as inner because it is on the inside of the housing. The housing is in particular closed by a cover, such as a substantially planar cover.

[0027] According to one aspect of the invention, the free end is a flat portion. The flat portion forms one of the axial thrust stops.

[0028] According to one aspect of the invention, the inner annular wall comprises, over part of its height, a chamfer radially inwardly and adjacent to the free end.

[0029] According to one aspect of the invention, a toothed sector of a rotary output member, in particular a gear, abuts axially against the free end.

[0030] According to one aspect of the invention, one of the axial thrust stops is therefore present inside the housing.

[0031] According to one aspect of the invention, the inner annular wall forming the axial thrust surrounds the output opening of the housing.

[0032] According to one aspect of the invention, the inner annular wall forming the axial thrust stop is cylindrical with a circular cross section.

[0033] According to one aspect of the invention, the inner annular wall forming the axial thrust stop is concentric with the barrel of the second portion of the rotary output member.

[0034] According to one aspect of the invention, the inner annular wall forming the axial thrust is made in one piece with the rest of the housing.

[0035] According to one aspect of the invention, the housing comprises an outer annular wall provided with a free end or a shoulder forming the other of the axial thrust stops. The annular wall is referred to as outer because it is on the outside of the housing.

[0036] Thus, one of the axial thrust stops is inside the housing and the other of the axial thrust stops is outside the housing.

[0037] According to one aspect of the invention, the free end of the outer annular wall is a flat portion.

[0038] According to one aspect of the invention, the second part of the rotary output member, in particular the cylindrical barrel of the second part, comprises a flange, in particular an annular flange, which axially abuts against the free end or an annular shoulder of the outer annular wall of the housing.

[0039] According to one aspect of the invention, the outer annular wall forming the axial thrust stop surrounds the output opening of the housing.

[0040] According to one aspect of the invention, the outer annular wall forming the axial thrust stop is cylindrical with a circular cross section.

[0041] According to one aspect of the invention, the outer annular wall forming the axial thrust stop is concentric with the barrel of the second portion of the rotary output member.

[0042] According to one aspect of the invention, the outer annular wall forming the axial thrust is made in one piece with the rest of the housing.

[0043] According to one aspect of the invention, the inner diameter of the outer annular wall is smaller than the inner diameter of the inner annular wall forming the axial thrust stop.

[0044] According to one aspect of the invention, the actuator comprises a seal, in particular an annular seal, which bears against the periphery of the second portion of the rotating member so as to seal relative to the output opening.

[0045] According to one aspect of the invention, the seal comprises an annular lip which bears in a fluid-tight manner against a cylindrical barrel of the second portion of the rotating output member.

[0046] According to one aspect of the invention, the seal further comprises an edge pressed against the inner face of the housing in a fluid-tight manner.

[0047] According to one aspect of the invention, the seal has a U-shaped cross section, pressing against an inner annular wall forming an axial thrust stop.

[0048] According to one aspect of the invention, a seal is inserted into an annular space defined between an inner annular wall of the housing and a gear of a rotary output member.

[0049] According to one aspect of the invention, the seal as an additional component is made in particular of silicone or rubber.

[0050] According to one aspect of the invention, a rotary output member supports a magnet that facilitates operation of the angular position sensor.

[0051] According to one aspect of the invention, at least one of the first and second parts of the rotation output member, preferably both, are components manufactured in one piece.

[0052] According to one aspect of the invention, the first portion and the second portion of the rotation output member are welded together, in particular using laser welding or ultrasonic welding or friction welding.

[0053] According to one aspect of the present invention, the first portion and the second portion of the rotation output member respectively have a convex and concave shape that can be assembled with each other, and these shapes are welded together.

[0054] According to one aspect of the invention, a first portion of the rotary output member comprises a concave shape defined by an annular groove, while a second portion of the rotary member comprises a convex shape defined by an axial ring insertable into the annular groove of the first portion.

[0055] According to one aspect of the invention, the second portion of the rotating member comprises a cylindrical barrel closed by a transverse wall, and the ring is connected to the transverse wall.

[0056] According to one aspect of the invention, the free end of the ring is chamfered.

[0057] According to one aspect of the invention, the second part of the rotating member comprises a shoulder, in particular an annular shoulder, against which the gear wheel of the first part bears.

[0058] According to one aspect of the invention, the first part of the rotating member comprises a hollow cylinder connected to the gear wheel, the hollow cylinder comprising a space for housing a magnet of a position sensor, in particular of the Hall Effect type.

[0059] According to another aspect of the present invention, the first portion and the second portion of the rotation output member are assembled together by snap-fastening.

[0060] According to one aspect of the invention, at least one of the first and second parts of the rotation output member comprises a snap-fastening shape cooperating with the other of the first and second parts, in particular in the form of a snap-fastening tab.

[0061] According to one aspect of the invention, the second part of the rotating member comprises a snap-fastening tab designed to retain the first part of the rotating member on a shoulder of the second part.

[0062] After snap-fastening, the rotating member bears against two opposite axial thrust stops.

[0063] According to one aspect of the invention, the snap-fastening tabs bear against a gear wheel of the first portion of the rotating member.

[0064] According to one aspect of the invention, the snap fastening tabs are arranged on a circular periphery.

[0065] According to one aspect of the invention, the tabs are rotationally symmetrical to each other. As an alternative, the tabs may have different shapes to each other.

[0066] According to one aspect of the invention, the snap-fastening tabs are four in number.

[0067] According to one aspect of the invention, the second part of the rotating member comprises a retaining groove into which the gear of the first part of the rotating member is inserted once the snap-fastening tab is overcome.

[0068] According to one aspect of the invention, the first part of the rotating member comprises a gear and a hollow column connected to the gear, the hollow column comprising apertures in each of which a tip of a snap-fastening tab is engaged.

[0069] According to one aspect of the invention, the aperture is adjacent to the gear.

[0070] According to one aspect of the invention, the orifices are located on a circular periphery.

[0071] According to one aspect of the invention, the actuator is of electromechanical type.

[0072] According to one aspect of the invention, an actuator includes an electric motor and a gear train actuatable by the electric motor to transfer torque to a rotational output member.

[0073] According to one aspect of the invention, an actuator includes an electronics board supporting an angular position sensor for detecting the angular position of a rotary output member.

[0074] According to one aspect of the invention, the actuator is associated with a valve for conducting a heat transfer fluid in a cooling circuit, or with a non-return valve for a heat transfer fluid in a cooling circuit, or with a throttle valve for a heat transfer fluid in a cooling circuit.

[0075] The present invention relates to a method for manufacturing an actuator, the method comprising the following steps: i) providing a housing; ii) providing a rotary output member, which is arranged in a manner to generate an actuating torque, the rotary output member being rotatable relative to the housing about a rotation axis and comprising a first part and a second part assembled together, the housing being provided with two opposite axial thrust stops, each part of the member being supported on a respective axial thrust stop; iii) assembling the first part and the second part of the rotary output member so that once assembled and supported on the axial thrust stops of the housing, the rotary output member remains axially stationary in the direction of the rotation axis.

[0076] According to one aspect of the invention, the assembly is achieved by welding the first and second parts of the rotary output member together.

[0077] According to one aspect of the invention, assembly is achieved by snap-fastening the first and second parts of the rotation output member together. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Other characteristics and advantages of the invention will become more apparent on reading the following description, given by way of illustrative and non-limiting examples, with reference to the accompanying drawings, in which:

[0079] Figure 1 A cross section of an actuator not relevant to the present invention is shown schematically and partially;

[0080] Figure 2 A perspective view schematically and partially showing an actuator according to an exemplary embodiment of the present invention;

[0081] Figure 3 Schematically and partially shown Figure 2 A perspective view of an actuator of , without showing the cover;

[0082] Figure 4 Schematically and partially shown Figure 2 a surface of an actuator;

[0083] Figure 5 Schematically and partially shown Figure 2 The cross section of the actuator on VV;

[0084] Figure 6 Schematically and partially shown Figure 2 a perspective view of a first portion of a rotating member of an actuator;

[0085] Figure 7 Schematically and partially shown Figure 2 a perspective view of a second portion of the rotating member of the actuator;

[0086] Figure 8 shows schematically and partially a cross section of an actuator according to an exemplary embodiment of the invention;

[0087] Fig. 9 Schematically and partially shown Figure 8 A perspective view of a first portion of a rotating member of an actuator. DETAILED DESCRIPTION

[0088] Figures 2 to 7 An actuator 1 of electromechanical type is shown comprising an electric motor 2 , for example of the BLDC type, and a gear train 3 of the reduction gear train type, actuatable by an output pinion 4 of the electric motor 2 in order to transmit a torque to a rotary output member 5 .

[0089] The gear train 3 comprises, in a known manner, a plurality of gear wheels 6 of different diameters.

[0090] The actuator 1 comprises a housing 8 closed by a substantially planar cover 9, both of which are made of plastic in this case. The housing 8 comprises, in a manner known per se, an electrical connection socket 7 designed to cooperate with an electrical connector (not shown).

[0091] The actuator 1 also comprises an electronic board 10 which supports an angular position sensor 11 of the Hall Effect type for detecting the angular position of the rotating output member 5, such as Figure 5 Clearly visible in.

[0092] The actuator 1 may be associated with a valve for conducting a heat transfer fluid in a cooling circuit, or with a non-return valve for a heat transfer fluid in a cooling circuit, or with a throttle valve for a heat transfer fluid in a cooling circuit.

[0093] For example, the rotary output member 5 is associated with a valve for selectively adopting an open or closed position with respect to the flow of fluid through the valve.

[0094] The rotary output member 5 is designed to provide an actuating torque for actuating a valve, for example.

[0095] The rotating member 5 is rotatable relative to the housing 8 about the rotation axis XR and comprises a first part 14 and a second part 15 assembled together.

[0096] The housing 8 is provided with two opposite axial thrust stops 17 and 18, and each part 14; 15 of the rotary output member 5 is respectively supported on each thrust stop, so that once assembled and supported on the axial thrust stops 17; 18 of the housing, the rotary output member 5 remains axially stationary in the direction of the rotation axis XR.

[0097] The first and second parts 14 ; 15 of the rotating member 5 sandwich an axial thrust stop 17 ; 18 of the housing 8 .

[0098] like Figure 6 As shown, the first portion 14 of the rotary output member 5 comprises a gear wheel 19 configured to cooperate with the gear wheel 6 of the gear train 3 .

[0099] The diameter of this gear wheel 19 corresponds to the maximum diameter of the rotary output member 5 , this diameter being measured perpendicularly to the axis of rotation XR.

[0100] The second portion 15 of the rotary output member 5 comprises a female plug-in connector 20 formed by a cavity configured to cooperate with a valve actuation member, such as a shutter not shown.

[0101] like Figure 4 As can be seen in the drawing, the cavity 20 has a leaf-shaped cross-section designed to receive a correspondingly shaped stem of, for example, a valve shutter actuating member.

[0102] The second part 15 is designed to rotate in a circular output opening 21 of the housing 8 , thereby forming a pivot connection between the second part 15 and the housing 8 .

[0103] like Figure 5 As shown, the second portion 15 extends through the outlet opening 21 .

[0104] The second portion 15 is designed to rotate in contact with the inner wall 22 of the output opening 21 .

[0105] The housing 8 and its outlet opening 21 thus form a plain journal bearing for the rotating component 5 .

[0106] Thanks to the invention, only a single plain journal bearing is required to perform the pivoting function, thereby reducing frictional wear.

[0107] The second part 15 of the rotary output member 5 comprises a cylindrical barrel 24 engaged in the output opening 21 .

[0108] The housing 8 comprises an inner annular wall 25 provided with a free end 26 in the form of a flat portion forming the axial thrust stop 17. This annular wall 25 is called inner because it is on the inside of the housing 8.

[0109] The inner annular wall 25 comprises, over part of its height, a chamfer 27 radially inwardly and adjacent to the free end 26 .

[0110] The gear wheel 19 of the rotary output member 5 axially abuts against the free end 26 .

[0111] This inner annular wall 25 surrounds the outlet opening 21 of the housing 8 and has a cylindrical shape of circular cross section, concentric with the barrel 24 of the second part 15 .

[0112] This inner annular wall 25 is made in one piece with the rest of the housing 8 .

[0113] The housing 8 further comprises an outer annular wall 28 provided with a free end 29 in the form of a flat forming a further axial thrust stop 18. This annular wall 28 is called outer because it is on the outside of the housing 8.

[0114] The cylindrical body 24 of the second portion 15 comprises an annular flange 30 axially abutting the free end 29 .

[0115] The outer annular wall 28 surrounds the output opening 21 of the housing 8 and has a cylindrical shape of circular cross section, concentric with the barrel 24 of the second part 15 of the rotary output member.

[0116] This outer annular wall 28 forming the axial thrust is made in one piece with the rest of the housing 8 .

[0117] The inner diameter of the outer annular wall 28 is smaller than the inner diameter of the inner annular wall 25 .

[0118] The actuator 1 comprises an annular seal 33 which bears against the periphery of the second portion 15 of the rotating member 5 so as to seal relative to the output opening 21 .

[0119] This seal 33 comprises an annular lip 34 bearing in a fluid-tight manner against the cylindrical barrel 24 of the second portion 15 , and an edge 35 pressed in a fluid-tight manner against the internal face of the housing 8 .

[0120] The seal 33 has a U-shaped cross section which presses against the inner annular wall 25 .

[0121] The seal 33 is inserted in an annular space 36 defined between the inner annular wall 25 of the housing 8 and the gear 19 of the rotary output member 5 .

[0122] The seal 33 as an additional component is made of silicone or rubber.

[0123] The rotary output member 5 supports a magnet 38 which facilitates the operation of the angular position sensor.

[0124] The first part 14 and the second part 15 of the rotation output member 5 are manufactured as two one-piece components.

[0125] In the described example, the first portion 14 and the second portion 15 of the rotation output member 5 are welded together using laser welding or ultrasonic welding or friction welding.

[0126] The first portion 14 of the rotary output member 5 comprises a concave shape defined by an annular groove, while the second portion 15 of the rotary member comprises a convex shape defined by an axial ring 39 which can be inserted into the annular groove of the first portion 14, as in Figure 6 and Figure 7 Best visible in.

[0127] The free end of the ring 39 is chamfered.

[0128] The cylindrical body 24 is closed by a transverse wall 40 to which the ring 39 is connected.

[0129] This transverse wall 40 comprises an annular shoulder 41 against which the toothed wheel 19 of the first part 14 bears.

[0130] The first portion 14 of the rotating member 5 comprises a hollow cylinder 42 connected to the gear wheel 19 , the hollow cylinder 42 comprising a space for accommodating the magnet 38 .

[0131] In reference Figure 8 and Fig. 9 In another embodiment of the present invention described, the first portion 50 and the second portion 51 of the rotation output member 52 are assembled together by snap-fit ​​fastening.

[0132] Those features of this embodiment that are identical or very similar to the previous embodiment will not be described in detail below.

[0133] The second portion 51 of the rotating member 52 comprises four snap-fastening tabs 54 designed to retain the first portion 50 on shoulders 55 of this second portion 51 .

[0134] After snap-fastening, the rotating member 52 bears against two opposite axial thrust stops 17 , 18 , as described above.

[0135] The snap-fastening tab 54 bears against the gear wheel 19 of the first portion 50 of the rotating member 52 .

[0136] The snap-fastening tabs 54 are arranged on a circular periphery and are rotationally symmetrical to each other.

[0137] The second part 51 of the rotating member 52 comprises a retaining groove 57 into which the gear 19 of the first part 50 of the rotating member 52 is inserted once the snap-fastening tab 54 is overcome.

[0138] The first portion 50 of the rotating member 52 also comprises a hollow post 58 connected to the gear wheel 19 , the hollow post 58 comprising apertures 59 in each of which a tip of a snap-fastening tab 54 engages.

[0139] The apertures 59 are located near the gear 19 and are arranged on a circular periphery.

[0140] The second portion 51 comprises, at one end thereof, a flange 60 which abuts against a shoulder 61 of an external annular wall 62 of the housing so as to define an axial thrust stop 18 within the meaning of the invention.

[0141] In the above example, the first and second parts of the rotary output member 5 or 52 are assembled in such a way that once assembled and supported on the axial thrust stops 17, 18 of the housing, the rotary output member 5 or 52 remains axially stationary in the direction of the rotation axis XR.

Claims

1. An actuator (1) comprising a housing (8); a rotary output member (5; 52) arranged in a manner to provide an actuating torque, the rotary output member being rotatable relative to the housing (8) about a rotation axis (XR) and comprising a first part (14; 50) and a second part (15; 51) assembled together, the housing (8) being provided with two opposite axial thrust stops (17, 18), each part of the rotary output member being supported on a respective axial thrust stop, so that once assembled and supported on the axial thrust stops (17, 18) of the housing, the rotary output member remains axially stationary in the direction of the rotation axis (XR).

2. The actuator (1) according to claim 1, wherein: The first portion (14; 50) and the second portion (15; 51) of the rotating member sandwich the axial thrust stop of the housing.

3. An actuator (1) according to any one of the preceding claims, wherein: The first portion (14; 50) of the rotational output member comprises a toothed sector, in particular in the form of a gear wheel (19), configured to cooperate with a complementary gear wheel element.

4. An actuator (1) according to any one of the preceding claims, wherein: The second portion (15; 51) of the rotary output member comprises a male or female plug-in connector (20) designed to cooperate with an actuating member, in particular of the type designed to perform a valve function.

5. An actuator (1) according to any one of the preceding claims, wherein: The second part (15; 51) is designed to rotate in an output opening (21) of the housing, the output opening (21) being in particular a circular opening, thereby forming a pivot connection between the second part (15; 51) and the housing (8).

6. An actuator (1) according to any one of the preceding claims, wherein: The housing comprises an inner annular wall (25) provided with a free end (26) forming one of the axial thrust stops (17).

7. An actuator (1) according to any one of the preceding claims, wherein: The housing comprises an outer annular wall (28) provided with a free end or shoulder forming another of the axial thrust stops (18).

8. An actuator (1) according to any one of the preceding claims, wherein: The actuator comprises a seal (33), in particular an annular seal, which bears against the periphery of the second portion of the rotating member so as to seal relative to an output opening (21) of the housing.

9. An actuator (1) according to any one of the preceding claims, wherein: The first part (14) and the second part (15) of the rotary output member are welded together, in particular using laser welding or ultrasonic welding or friction welding.

10. The actuator (1) according to any one of claims 1 to 8, wherein: The first part (50) and the second part (51) of the rotation output member are assembled together by snap-fastening.

11. An actuator (1) according to any one of the preceding claims, wherein: At least one of the first and second parts of the rotational output member comprises a snap-fastening shape cooperating with the other of the first and second parts, in particular in the form of a snap-fastening tab (54).

12. A method for manufacturing an actuator (1), the method comprising the following steps: i) providing a housing (8); ii) providing a rotary output member (5; 52) arranged in such a way as to provide the actuating torque, the rotary output member being rotatable relative to the housing about an axis of rotation (XR) and comprising a first part and a second part assembled together, the housing being provided with two opposite axial thrust stops, each part of the member being supported on a respective axial thrust stop; iii) Assembling the first part (14; 50) and the second part (15; 51) of the rotary member so that once assembled and bearing on the axial thrust stop of the housing, the rotary output member remains axially stationary in the direction of the axis of rotation (XR).

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