Electric motor corrector and mechanical stops for automotive vehicle headlight.

Abstract

- Electric motor corrector and mechanical stops for automotive vehicle headlight.- The headlight leveling corrector (1) for a motor vehicle comprises a housing (2) provided with a rod (3) and an electromechanical assembly (4) that generates a longitudinal displacement of the rod (3), the electromechanical assembly (4) comprising an electric motor (5) generating a rotational movement and a mechanical device (6) that transforms the rotational movement of the motor (5) into a longitudinal displacement of the rod (3), the leveling corrector (1) comprising two mechanical stops (19) formed of retaining elements arranged on the rod (3) and cooperating with buffers, each mechanical stop (19) defining a reference position (P1), the leveling corrector comprising a counting device configured to measure data values ​​associated with the rotational movements of the motor (5) and representing the distance traveled by the rod (3) during its displacement relative to a reference position (P1). Figure for the abbreviation: Fig. 2a.

Description

Title of the invention: Corrector with electric motor and mechanical stops for motor vehicle lighting projector. Technical field

[0001] The present invention relates to a corrector with an electric motor and mechanical stops for a motor vehicle lighting projector. Prior art

[0002] Usually, a lighting projector for a motor vehicle generally comprises at least one light source arranged in front of an optical reflector. A light beam emitted by the light source is projected outside the motor vehicle at the front or rear. More particularly, the reflector has the function of directing the light beam.

[0003] In order to modify the position of the reflector and thus orient the light beam, a corrector is used. Usually, a corrector is equipped with a rod, one end of which is connected to the reflector, and an electric motor, the operation of which is controlled by a control unit. Generally, the electric motor performs rotational movements in one direction or the other. These rotational movements are transformed, by a mechanical device, into longitudinal displacement of the rod in one direction or the other. Such a displacement causes the reflector to pivot, which modifies the orientation of the light beam. In addition, a counting device is used to measure a quantity associated with the rotations of the electric motor, for example the number of revolutions made during its use.This quantity is therefore also representative of the relative distance traveled by the rod during its rectilinear movement between starting and stopping the electric motor.

[0004] However, such a corrector does not take into account a reference position for each new use of the motor. Counting the number of revolutions, for example, therefore does not make it possible to define the current position of the rod which is linked to the reflector after each use. However, without defining a current position of the rod between two uses of the motor, it is not possible to know the exact orientation of the light beam.

[0005] This solution is therefore not satisfactory. Statement of the invention

[0006] The object of the present invention is to remedy this drawback.

[0007] It relates to a headlight corrector for a motor vehicle.

[0008] According to the invention, the corrector comprises: - a housing provided with a rod and an electromechanical assembly capable of generating a longitudinal movement of said rod, said electromechanical assembly comprising an electric motor capable of generating a rotational movement and a mechanical device capable of transforming the rotational movement of said electric motor into longitudinal movement of said rod; - two mechanical stops, each of said mechanical stops being formed of at least one stop element arranged on the rod and cooperating with at least one stopper, each of said mechanical stops defining a reference position of said rod; and - a counting device configured to measure data values ​​associated with the rotational movements of said electric motor and representative of the distance traveled by said rod during its longitudinal movement relative to one of said reference positions, said reference positions defining the maximum distance that can be traveled by said rod.

[0009] Thus, thanks to the invention, the mechanical stops define reference positions of the longitudinal rod making it possible to determine its exact current position each time the electric motor is used.

[0010] Advantageously, the electric motor is a direct current motor whose rotational movements generate a succession of current peaks, the number of successive peaks generated representing one of said data values ​​measured by the counting device.

[0011] Preferably, the mechanical device comprises: - a worm screw comprising a thread and a first end fixed to the electric motor, said worm screw being subjected to the rotational movements generated by said electric motor; and - a wheel comprising a notch and a thread, said thread of the wheel being shaped to said rod to form a helical connection, said helical connection being configured to transform the rotational movements of the worm screw transmitted to the wheel into longitudinal movement of said rod.

[0012] Furthermore, in a first embodiment, each of said stops is formed from a flat face perpendicular to the thread of the wheel, said flat face being associated with one end of said thread of the wheel.

[0013] Advantageously, in this first embodiment, a stop element is formed from a protuberance arranged on an internal face of the rod.

[0014] In a second embodiment, each of said stops is arranged at one end of an internal face of the housing.

[0015] Preferably, in this second embodiment, each of said stop elements is arranged at one end of a peripheral face of said rod.

[0016] Furthermore, advantageously, the mechanical device also comprises a auxiliary screw provided with a thread shaped to cooperate with the notching of said wheel and with a notching shaped to cooperate with the thread of said worm screw, said auxiliary screw being capable of transmitting the rotational movements of the worm screw to the wheel.

[0017] The present invention further relates to a headlight for a motor vehicle, which is provided with a corrector such as that described above. Brief description of the drawings

[0018] The attached figures will make it clear how the invention can be implemented. In these figures, identical references designate similar elements.

[0019] [fig. 1] Figure 1 schematically illustrates a lighting projector corrector according to a preferred embodiment.

[0020] [fig.2a-2b] Figures 2a and 2b schematically show cross-sections of the lighting projector corrector in two different positions according to a first embodiment.

[0021] [fig.3a-3b] Figures 3a and 3b schematically illustrate cross-sections of the lighting projector corrector provided with a rod in two different positions according to a second embodiment.

[0022] [fig.4a-4b] Figures 4a and 4b schematically represent elements of a housing of the lighting projector corrector according to a particular embodiment.

[0023] [fig.5] Figure 5 schematically illustrates a worm screw forming part of the lighting projector corrector.

[0024] [fig.6] Figure 6 schematically illustrates an auxiliary screw forming part of the lighting projector corrector.

[0025] [fig.7] Figure 7 schematically illustrates a wheel forming part of the corrector of lighting projector according to the second embodiment. Description of the embodiments

[0026] The corrector 1 for a motor vehicle headlight making it possible to illustrate the invention and shown schematically in FIG. 1, is intended to modify the position of a reflector arranged inside a headlight.

[0027] In the context of the invention, the corrector 1 comprises, as shown in Figure 1, a housing 2. This housing 2 is provided with a rod 3 and an electromechanical assembly 4 capable of generating a longitudinal displacement of the rod 3. As shown in Figures 2a and 3a, the electromechanical assembly 4 comprises an electric motor 5 configured to generate rotational movements and a mechanical device 6 configured to transform the rotational movements of the motor 5 into longitudinal displacement of the rod 3.

[0028] Furthermore, the corrector 1 also comprises two mechanical stops 19. These mechanical stops 19 are formed of one or more stop elements arranged on the rod 3 which each cooperate with one or more stops 19A. These mechanical stops 19 define a reference position PI, P2 of the rod 3.

[0029] In the context of the invention, the terms reference positions P1, P2 are understood to mean the positions of the rod 3 defining the maximum distance that the rod 3 can travel during a longitudinal movement.

[0030] Furthermore, the corrector 1 comprises a counting device (not shown) which is configured to measure data values ​​associated with the rotations of the motor 5. These data are representative of the distance traveled by the rod 3 during its longitudinal movement relative to at least one of the reference positions P1, P2.

[0031] In the remainder of the description, and as shown in Figures 2a, 2b, 3a and 3b, two orthogonal axes associated with the corrector 1 are used, namely a so-called longitudinal axis XX which is oriented along the rod 3, and a transverse axis YY which defines, with the longitudinal axis XX, a longitudinal plane XY. Furthermore, the adjectives “upper” and “lower” with respect to the corrector 1 are defined respectively according to the direction of an arrow F and the direction opposite to that of the arrow F. Furthermore, the adjectives “front” and “rear” with respect to the corrector 1 are defined respectively according to the direction of an arrow G and the direction opposite to that of the arrow G. Furthermore, the adjectives “internal” and “peripheral” with respect to the corrector 1 are defined according to the radial direction with respect to the longitudinal axis XX, respectively towards the inside of the rod 3 and towards the outside of the rod 3.

[0032] As shown in Figures 4a and 4b, the housing 2 comprises a first and a second element 2A and 2B each arranged in a plane parallel to the longitudinal plane XY. The elements 2A, 2B are capable of being fitted together. A seal 7 is arranged around the front part of the elements 2A and 2B of the corrector 1, as shown in Figure 1. This seal 7 is configured to keep the corrector 1 sealed. Furthermore, the housing 2 forms an internal space comprising several compartments C1, C2, C3 in which the rod 3 and the electromechanical assembly 4 are arranged.

[0033] As shown in particular in Figures 2b and 3b, the rod 3 is formed of a hollow cylindrical body 3A arranged along the longitudinal axis XX in an upper front compartment C1 of the housing 2. The hollow cylindrical body 3A is provided with an internal face and a peripheral face. The rod 3 further comprises a sphere 3B which is fixed to a front end of the cylindrical body 3A. The rod 3 further comprises a rear end 3C, opposite the sphere 3B. As shown in Figure 1, the sphere 3B is arranged outside the housing 2. The rod 3 is able to move along the longitudinal axis XX, towards the front of the corrector 1 in the direction of the arrow G or towards the rear of the corrector 1 in the direction opposite to that of the arrow G. The longitudinal movement of the rod 3 generates a modification of the orientation of the re- deflector which is linked to sphere 3B (not shown).

[0034] Furthermore, the electromechanical assembly 4 comprises a motor 5 which is arranged in a compartment C2 lower than the front of the corrector 1, as shown in FIGS. 2b and 3b. The motor 5 is capable of receiving a control command. This control command may be a run command or a stop command. In the event of receiving a run command, the motor 5 is configured to generate rotational movements around an axis AA parallel to the longitudinal axis XX. These rotational movements may be carried out in a direction represented by the arrow RI or in the opposite direction.

[0035] In a particular embodiment, the motor 5 is a brushed direct current electric motor. It is provided with a stator provided with magnets, a rotor provided with a winding, a shaft, a commutator and a plurality of brushes (not shown). The brushes are connected to a direct current generator. Depending on the polarity of the current supplied by the generator, the motor 5 generates rotational movements of the shaft in the direction of the arrow RI or in the opposite direction. These rotational movements generate a succession of commutations of the brushes on the commutator. Each commutation causes a rapid variation in the resistance of the motor 5 which is associated with a current peak. The number of successive commutations is represented by a number of current peaks.

[0036] Furthermore, as shown in Figures 2b and 3b, the electromechanical assembly 4 also comprises the mechanical device 6 which is fixed to the motor 5 on the one hand and to the rod 3 on the other hand. This mechanical device 6 is configured to transform the rotational movements of the motor 5 into longitudinal displacement of the rod 3.

[0037] In a preferred embodiment, the mechanical device 6 comprises a worm screw 8. As shown in Figures 2a, 2b, 3a, 3b and 5, the worm screw 8 is arranged along the axis AA in the lower part of a rear compartment C3 of the housing 2. It is located in the extension of the shaft of the motor 5 to which it is fixed by one end 8A. In a particular embodiment, the end 8A of the worm screw 8 is fixed by force fitting onto the shaft of the motor 5. The worm screw 8 is subjected to the rotational movements generated by the motor 5 around the axis AA in the direction of the arrow RI or in the opposite direction. In addition, the worm screw 8 is provided with a thread 8B extending over its entire length.

[0038] In a particular embodiment shown in Figures 2a, 2b, 3a, 3b and 6, the mechanical device 6 also comprises an auxiliary screw 9 which is arranged along the transverse axis YY in the compartment C3. It is provided with a thread 9A on an upper part, a notch 9B on a lower part and a solid cylinder 9C between the thread 9A and the notch 9B.

[0039] In the context of the invention, the term “notching 9B” means a succession of notches 20, preferably rectilinear, arranged parallel to each other and distributed ra- dially on the peripheral face of the auxiliary screw 9 or of a wheel 10. Furthermore, the orientation of the successive notches 20 of the auxiliary screw 9 is such that they form a non-zero angle with the transverse axis YY, as shown in Figure 6.

[0040] In a preferred embodiment, the notching 9B of the auxiliary screw 9 is shaped to cooperate with the thread 8B of the worm screw 8. The cooperation between the thread 8B and the notching 9B allows the transmission of rotational movements from the worm screw 8 to the auxiliary screw 9.

[0041] Furthermore, as shown in Figure 6, the auxiliary screw 9 is capable of performing rotational movements around the transverse axis YY in the direction of the arrow R2 or in the opposite direction. In addition, the solid cylinder 9C forms, with the housing 2, a pivot connection which allows rotational movements around the transverse axis YY but blocks any translational movement of the auxiliary screw 9 along this same transverse axis YY.

[0042] In a preferred embodiment, the mechanical device 6 also comprises a wheel 10. As shown in Figures 2a, 2b, 3a, 3b and 7, the wheel 10 is arranged along the longitudinal axis XX, perpendicular to the auxiliary screw 9. It is arranged astride the compartments C1 and C3.

[0043] Furthermore, the wheel 10 is capable of performing rotational movements around the longitudinal axis XX in the direction of the arrow R3 or in the opposite direction to that of the arrow R3. It is provided with a notch 10A in its rear part, as shown in FIG. 6. The notch 10A of the wheel 10 is shaped to the thread 9A of the auxiliary screw 9 with which it cooperates to transmit the rotational movements of the auxiliary screw 9 around the transverse axis YY to the wheel 10 around the longitudinal axis XX.

[0044] Furthermore, the wheel 10 is also provided with a thread 10B. A rear end of the thread 10B is formed by a flange 11 arranged in a plane perpendicular to the longitudinal axis XX. In addition, the diameter of the flange 11 is greater than the diameter of the wheel 9.

[0045] Furthermore, a front end of the notching 10A of the wheel 10 is formed by a collar 12 arranged in a plane perpendicular to the longitudinal axis XX. The diameter of the collar 12 is greater than the diameter of the wheel 10. Projections of the housing 2 are arranged in the space between the two collars 11 and 12 without being in contact with the wheel 10 (not shown). They form, with the collars 11 and 12, a pivot connection. This pivot connection allows the rotational movements of the wheel 10 around the longitudinal axis XX and blocks the translational movements of the wheel 10 along this same longitudinal axis XX.

[0046] In a preferred embodiment, the thread 10B of the wheel 10 is capable of being engaged in the hollow cylindrical body 3A of the rod 3 with which it forms a helical connection. The helical connection makes it possible to transform the rotational movements of the wheel 10 around the longitudinal axis XX in the direction of the arrow R3 or in the opposite direction, into translational movement of the rod 3 along the longitudinal axis XX in the direction of the arrow G or in the opposite direction.

[0047] In a preferred embodiment, the corrector 1 comprises two mechanical stops 19. A first mechanical stop 19 defines a reference position PI of the rod 3 called distal (hereinafter “distal reference position PI”), as shown in Figures 2a and 3a. A second mechanical stop 19 defines a reference position P2 of the rod 3 called proximal (hereinafter “proximal reference position P2”), as shown in Figures 2b and 3b.

[0048] In the context of the invention, the term distal reference position PI is understood to mean the reference position PI of the rod 3 in which the sphere 3B of the rod 3 is furthest from the corrector 1 in the direction of G. The term proximal reference position P2 is also understood to mean the reference position P2 of the rod 3 in which the sphere 3B of the rod 3 is closest to the corrector 1 in the direction of G.

[0049] Each of the mechanical stops 19 of the corrector 1 comprises one or more stop elements fixed on the rod 3 and one or more buffers 19A. The buffers 19A are shaped to cooperate with the stop elements of the rod 3 to block the longitudinal movement of the rod 3 in a particular direction.

[0050] In a first embodiment shown in particular in Figures 2a, 2b, 4a and 4b, the mechanical stops are called axial (hereinafter “axial stops”). The stop elements are arranged at the rear end 3C of a peripheral face of the rod 3. They are formed of projecting elements (not shown). Alternatively, they correspond to a ring arranged on the peripheral face of the rod 3 around the longitudinal axis XX.

[0051] As shown in Figures 4a and 4b, the stops are arranged on the internal face of compartment C3 of the housing 2. This internal face comprises a part of the internal face of the element 2A (hereinafter “first internal face 13”) and a part of the internal face of the element 2B (hereinafter “second internal face 14”).

[0052] In this first embodiment, the stops correspond to lugs 15 fixed to the front end and lugs 16 fixed to the rear end of the first internal face 13 along the longitudinal axis XX and the transverse axis YY. For example, the number of lugs 15, 16 is equal to four. The stops also correspond to lugs 17 fixed to the rear ends of the second internal face 14 and to a bar 18 fixed to the front end of the second internal face 14. The bar 18 is arranged along an axis parallel to the transverse axis YY. The length of the bar 18 is substantially equal to the diameter of the rod 3.

[0053] Furthermore, the number of stop elements is equal to the number of buffers 19A arranged at the rear end of the first and second internal faces 13 and 14.

[0054] In one variant, the stops 19A fixed on the second internal face 14 are exclusively lugs 17. In another variant, the stops 19A are arranged on the internal face 13, 14 of only one of the elements 2A or 2B.

[0055] Furthermore, in this first embodiment, the axial stops are configured to block the longitudinal movement of the rod 3 in the direction of the arrow G, when the stop elements come into contact with the bar 18 and the lugs 15. The rod 3 is then in the distal reference position PI, as shown in FIG. 2a.

[0056] The axial stops are also configured to block the longitudinal movement of the rod 3 in the direction opposite to that of the arrow G, when the stop elements are in contact with the lugs 16 and 17. The rod 3 is then in the proximal reference position P2, as shown in FIG. 2b.

[0057] In a second embodiment shown in particular in Figures 3a, 3b and 7, the mechanical stops 19 are called radial (hereinafter “radial stops”). The stops 19A are arranged on the thread 10B of the wheel 10, as shown in Figure 7, and the stop element (not shown) is arranged on the internal face of the rod 3. Each of the stops 19A is formed of a plane surface S1, S2 perpendicular to the thread 10B of the wheel 10. The surfaces S1, S2 correspond respectively to a front end and a rear end of the thread 10B.

[0058] The stop element is formed by a protrusion on the internal face of the rod 3. In a particular embodiment, the internal face of the rod 3 is provided with a thread. The protrusion corresponds to one end of the thread arranged at the rear of the rod 3.

[0059] In this second embodiment, the radial stops are configured to block the movement of the rod 3 in the direction of the arrow G or in the direction opposite to that of the arrow G. When the flat surface S1 and the protuberance are in contact, the helical connection is blocked. The rod 3 is then in the distal reference position P1 (see figure 3a). The cooperation between the flat surface S2 and the protuberance also blocks the helical connection. The rod 3 is then in the proximal reference position P2 (see figure 3b). In this second embodiment, the first and second internal faces 13 and 14 of the elements 2A and 2B of the housing 2 do not include stops 19A.

[0060] In a particular embodiment, the corrector 1 comprises a counting device (not shown). This counting device is configured to measure data values ​​which are associated with the rotations generated by the motor 5 when it is in operation. In a particular embodiment, the motor 5 is a brushed DC motor. One of the data values ​​corresponds to the number of successive current peaks generated by the commutations of the brushes on the collector. The number of peaks is representative of the distance traveled by the rod 3 during its longitudinal displacement relative to a reference position PI, P2.

[0061] The conditions of use of corrector 1 are explained below.

[0062] Usually, the motor 5 receives a control command. When the control command corresponds to a running command, the motor 5 generates rotational movements. In a particular embodiment, the running command includes information on the direction in which the motor 5 must rotate. The rotational movements are carried out either in the direction of the arrow RI or in the opposite direction to that of the arrow RL. In the case of a brushed DC motor 5, the rotational movements of the motor 5 generate successive commutations of the brushes with the collector. The counting device then measures the number of current peaks generated by the successive commutations during operation of the motor 5.

[0063] The rotational movements are transmitted to the worm screw 8 to which the motor 5 is fixed. The worm screw 8 rotates around the axis AA in the same direction as that of the shaft of the motor 5. The thread 8B of the worm screw 8 cooperates with the notching 9B of the auxiliary screw 9 and subjects the auxiliary screw 9 to rotational movements. The auxiliary screw 9 being arranged perpendicular to the worm screw 8, along the transverse axis YY, the rotational movements are carried out in the direction of the arrow R2 or in the opposite direction. As shown in Figures 2a, 2b, 3a and 3b, when the worm screw 8 carries out rotational movements according to the arrow RI, the auxiliary screw 9 carries out rotational movements according to the arrow R2.

[0064] The thread 9A of the auxiliary screw 9 cooperates with the notching 10A of the wheel 10 so that the rotational movements of the auxiliary screw 9 are transmitted to the wheel 10. The wheel 10 then performs rotational movements around the longitudinal axis XX in the direction of the arrow R3 or in the opposite direction. As shown in Figures 2a, 2b, 3a and 3b, the rotational movements of the auxiliary screw 9 in the direction of the arrow R2 are transformed into rotational movements of the wheel 10 in the direction of the arrow R3.

[0065] The wheel 10, which is formed of a threaded part 10B engaged in the hollow cylindrical body 3A, forms a helical connection with the rod 3. As shown in Figures 2a, 2b, 3a and 3b, the helical connection transforms the rotation of the wheel 10 in the direction of the arrow R3, respectively in the direction opposite to that of the arrow R3, into a longitudinal displacement in the direction of the arrow G, respectively in the direction opposite to that of the arrow G.

[0066] The rod 3 can travel a maximum distance along the longitudinal axis XX. This maximum distance is defined by the reference positions PI, P2.

[0067] In the first embodiment, the rotation of the wheel 10 in the direction of the arrow R3 causes the longitudinal displacement of the rod 3 in the direction of the arrow G until the lugs of the rod 3 come into contact with the lugs 15 or a part of the bar 18 which form the stops 19A. The rod 3 can no longer move in the direction of the arrow G and it is in the distal reference position PI, as shown in Figure 2a. In the second embodiment, the longitudinal movement of the rod 3 is blocked when the protuberance with which the internal face of the rod 3 is provided comes into contact with the flat surface SI which represents the front end of the thread 10A of the wheel 10 (Figures 2a and 7).

[0068] Furthermore, the rotation of the wheel 10 in the direction opposite to that of the arrow R3 causes the longitudinal displacement of the rod 3 in the direction opposite to that of the arrow G up to the reference position P2 proximal to the rod 3 (figure 2b).

[0069] In the first embodiment, the projecting elements (not shown) which are arranged on the rear end 3C of the peripheral face of the rod 3 move until they come into contact with the lugs 16 and 17 which are arranged at the rear end of the first and second internal faces 13 and 14.

[0070] In the second embodiment, the contact between the protuberance of the internal face of the rod 3 with the flat surface S2 which corresponds to the rear end of the thread 10A of the wheel 10 blocks the longitudinal movement of the rod 3 in the direction opposite to that of the arrow G. The rod 3 is in the proximal reference position P2, as shown in Figure 3b.

[0071] Furthermore, the corrector 1 makes it possible to define reference positions PI and P2 from which the current position of the rod 3 along the longitudinal axis XX can be determined. This current position defines the orientation of the reflector.

[0072] During operation of the motor 5, the counting device measures data values ​​representative of the rotations of the motor 5. In an embodiment where the motor 5 is a brushed DC motor, the values ​​of these data correspond to the number of current peaks generated by the commutations of the brushes on the collector. The rotational movements of the motor 5 are transformed into translational movements of the rod 3 by the mechanical device 6. Thus, the number of current peaks is proportional to the distance traveled by the rod 3. During initialization of the corrector 1, the rod 3 is arranged in a reference position P1, P2. As long as the motor 5 is operating, the rod 3 moves longitudinally. When the motor 5 stops, the counting device determines the current position of the rod 3.Upon subsequent use, the counting device associates the previous current position with the new distance traveled by rod 3 between reference positions PI and P2.

Claims

Claims

1. Headlight corrector for a motor vehicle, said corrector (1) comprising a housing (2) provided with a rod (3) and an electromechanical assembly (4) capable of generating a longitudinal movement of said rod (3), said electromechanical assembly (4) comprising an electric motor (5) capable of generating a rotational movement and a mechanical device (6) capable of transforming the rotational movement of said electric motor (5) into longitudinal movement of said rod (3), said corrector (1) also comprising two mechanical stops (19), each of said mechanical stops (19) being formed of at least one stop element arranged on the rod (3) and cooperating with at least one stopper (19A), each of said mechanical stops (19) defining a reference position (PI, P2) of said rod (3), said corrector (1) further comprising,a counting device configured to measure data values ​​associated with the rotational movements of said electric motor (5) and representative of the distance traveled by said rod (3) during its longitudinal movement relative to one of said reference positions (PI, P2), said reference positions (PI, P2) defining the maximum distance that can be traveled by said rod (3).,

2. Corrector according to claim 1, characterized in that the electric motor (5) is a direct current motor whose rotational movements generate a succession of current peaks, the number of successive peaks generated representing one of said data values ​​measured by the counting device.

3. Corrector according to any one of claims 1 and 2, characterized in that the mechanical device (6) comprises: - a worm screw (8) comprising a thread (8B) and a first end (8A) fixed to the electric motor (5), said worm screw (8) being subjected to the rotational movements generated by said electric motor (5); and - a wheel (10) comprising a notch (10A) and a thread (10B), said thread (10B) of the wheel (10) being shaped to said rod (3) to form a helical connection, said helical connection being configured to transform the rotational movements of the worm screw (8) transmitted to the wheel (10) into longitudinal displacement of said rod (3).

4. Corrector according to any one of claims 1 to 3, characterized in that each of said stops is formed of a flat face (SI, S2) perpendicular to the thread (10B) of the wheel (10), said flat face (SI, S2) being associated with one end of said thread (10B) of the wheel (10).

5. Corrector according to claim 4, characterized in that a stop element is formed by a protuberance arranged on an internal face of the rod (3).

6. Corrector according to any one of claims 1 to 3, characterized in that each of said stops is arranged at one end of an internal face (13, 14) of the housing (2).

7. Corrector according to claim 6, characterized in that each of said stop elements is arranged at one end of a peripheral face of said rod (3).

8. Corrector according to any one of the preceding claims, characterized in that the mechanical device (6) also comprises an auxiliary screw (9) provided with a thread (9A) shaped to cooperate with the notching (10A) of said wheel (10) and a notching (9B) shaped to cooperate with the thread (8B) of said worm screw (8), said auxiliary screw (9) being capable of transmitting the rotational movements of the worm screw (8) to the wheel (10).

9. Lighting projector for a motor vehicle, characterized in that it comprises a corrector (1) according to any one of claims 1 to 8.

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