Actuator for motorized hatch

Abstract

The present invention relates to a geared motor having an output toothed wheel provided with a toothed crown, constituting the last meshing stage of the movement reducer of said geared motor, associated with an elastically deformable connecting piece characterized in that: One of said toothed crown or connecting piece has an annular surface alternating smooth radius segments each extending over an angle of degrees and radius torque transmission stops each extending over an angle of degrees whose turning points are spaced apart by an angle equal to degrees with The other of said toothed crown or connecting piece having radial protrusions, each carried by a radially elastically deformable zone, capable of moving between a radius at rest and a radius when the torque applied between said toothed crown and said connecting piece exceeds a reference value Cmax. Abstract figure: figure 1

Description

Title of the invention: Actuator for motorized hatch Field of invention

[0001] The present invention relates to the field of rotary mechatronic drive of a mobile member which may occasionally be subjected to inappropriate external forces.

[0002] This is for example the drive of a protective hatch for the electric charging socket of an electric vehicle, or a fuel hatch, the closing and opening of which are ensured by an actuator, but which the user can close manually, thus causing excessive torque on the drive chain, or a rearview mirror adjustable by an actuator, but which an obstacle can force into a movement which can damage the drive chain, or a vehicle sensor cleaning device activated by an actuator, but which can be driven manually by a user, or a swivel seat the movement of which can be either blocked or manually oriented too abruptly or a car door opening handle, the deployment of which is ensured by an actuator, and more generally any member whose positioning is mainly ensured by a mechatronic system,but which occasionally may be forced into a movement causing excessive torque on the drive mechanism.

[0003] The aim of the invention is to protect the mechatronic chain, in particular the gears, some of which are made of medium-strength plastic material, as well as the electronics of the actuator, and optionally to protect the driven member. This aim is fundamentally different from the torque limiters known for limiting screwing forces, in particular in the surgical field, where it is not a question of protecting the drive means, but the driven screw and especially the screw installation area. State of the art

[0004] Known in the art is patent application EP2992234A1 relating to a friction coupling mechanism for a portable machine tool, allowing a tool connection to be uncoupled from a drive motor in the event of an overload. An annular sliding surface has cams projecting radially inwards. The friction coupling mechanism has a set of pairs consisting respectively of a prestressed helical spring and a blade. The helical spring presses a head of the blade radially outwards onto the sliding surface. The blade has a strip sheet, a section of which is intended to become the head is bent so as to form a hollow prism, annularly closed except for a slot. An insert introduced into the slot fills said slot.

[0005] Also known is patent EPI 13557IB 1 which describes a gear motor closing part control for a motor vehicle comprising a drive-side gear wheel and a driven-side driver, which, from a manufacturing and / or assembly position in which they are axially spaced apart from each other, can be axially fitted into each other to achieve their operating position with mutual direct rotary drive connection, the gear wheel or the driver being provided with elastic spring elements formed in one piece, against which corresponding cams of the driver or the gear wheel can be pressed in order to achieve mutual stop damping during the mutual relative rotational movement due to a stop of movement of the driver while the gear wheel is still driven,characterized in that the gear wheel and the driver are produced as individual parts of an injection-molded part and the spring elements are arranged as spring bars of the gear wheel or the driver which extend substantially tangentially and are provided with stop bevels in such a way that they are radially deformable, elastically, by the cams which abut by sliding against the stop bevels during a relative mutual rotational movement.

[0006] Finally, we know patent US 11022188B2 relating to an overload clutch, comprising: - a cylindrical clutch housing having a housing body and a housing cover, and comprising two clutch elements arranged inside the clutch housing, via which a drive movement is transmissible in an engaged state, wherein the clutch elements, for transmitting the drive movement in the engaged state, are engaged with each other by interlocking and / or friction and can be disengaged in the event of overload, - wherein the housing body comprises a plurality of engagement elements, which are arranged on an outer circumference of the housing body and face radially inward, and the housing cover comprises a plurality of retaining structures corresponding to the engagement elements, which are arranged on an outer circumference of the housing cover and face radially outward, - wherein the engaging elements can be brought into engagement with the retaining structures by rotating the housing cover relative to the housing body, - wherein the retaining structures each have a retaining edge extending in the circumferential direction of the housing cover, wherein, in an assembled state, each engagement element extends behind a respective one of the retaining edges, - wherein the retaining structures each have two ribs, which limit the retaining edges on both sides in the circumferential direction of the housing body, and - wherein a first web of each of the retaining structures has a smaller axial extension than a second web of the respective retaining structure. Disadvantages of the prior art

[0007] The solutions of the prior art often provide for an assembly of multiple parts, of complex configurations. The interacting parts involve significant deformations in the area close to the triggering torque. These solutions are also not compact and lead to an increased size of the geared motor compared to a solution providing equivalent performance in terms of torque and output speed.

[0008] Furthermore, the mechanical principles implemented for limiting the torque, such as those presented in patent EPI 135571B1, lead to rapid wear of the interacting parts, and a modification of the trigger threshold, or even a loss of efficiency.

[0009] Finally, the known solutions do not allow simple modifications to know at any time the position of the driven member even in the event of breakage of an element internal to the reducer. Solution provided by the invention

[0010] The present invention relates, in its most general sense, to a geared motor having an output toothed wheel provided with a toothed crown, constituting the last meshing stage of the movement reducer of said geared motor, associated with an elastically deformable connecting piece characterized in that: - One of said toothed crown or connecting piece has an annular surface alternating • smooth segments of radius each extending over an angle of a degrees and • torque transmission stops of radius Ri each extending over an angle of degrees whose turning points are spaced apart by an angle equal to a + p degrees • withRi^Rz - The other of said toothed crown or connecting piece having radial protrusions, each carried by a radially elastically deformable zone, capable of moving between a radius Rz at rest and a radius R] when the torque applied between said toothed crown and said connecting piece exceeds a reference value Cmax.

[0011] The geared motor according to the invention may also include one or more compatible characteristics among the following: - the number N torque transmission stops of said toothed crown is an integer multiple of the number of radial protrusions of said connecting piece, - said connecting piece has an annular shape extended radially by radial arms with a pitch of 5 degrees, two successive radial arms being connected at their radial end by said elastically deformable zones, - said elastically deformable zones are symmetrical with respect to at least one radial plane, - said toothed crown has N torque transmission stops, with N between 3 and 10, and preferably equal to 5, - spring blades are arranged tangentially, each facing a radial protrusion, said radial protrusions being extended radially in the direction of the spring blade facing it, until it comes into contact, by a support zone, - said connecting piece is formed by a tubular coupling sleeve having radial rigid arms, and an outer crown formed by deformable beams each extending tangentially between the ends of two consecutive rigid arms, - the radius Rz is greater than the radius R\ and said elastically deformable zones are constituted by spring blades extending tangentially relative to a radial arm, the ends of said spring blades having radial protrusions extending over an arc of degrees, in particular, the angular difference between the deformations of two consecutive spring blades can be a multiple of a + - said connecting piece is secured to a magnet and said geared motor comprises a magneto-sensitive probe positioned in a part swept by said magnet during rotation of said connecting piece, - a means for detecting variations in the relative position of the toothed wheel with respect to the connecting part, provided by at least one sensor, in this case, a microcontroller can execute an algorithm for comparing the variations in relative position of said connecting piece with variations in relative position of said rotor, to determine a loss of synchronism between said connecting piece and said ring gear, in addition, said microcontroller can return to the vehicle's ECU an error message when said algorithm determines a loss of synchronism between said connecting piece and said ring gear; also said microcontroller can have a re-engagement sequence consisting of controlling a movement of the rotor generating a movement of the ring gear, when the driven member is resting on a stop, said sequence ending when the torque transmission stops of the ring gear engage with the torque transmission stops of said connecting piece, - in the case where a re-engagement sequence is integrated, the detection of re-engagement of the torque transmission stops of the toothed crown with the radial protrusions of said connecting part can be carried out by • a comparison of the variations in relative position of said connecting part with respect to variations in relative position of said rotor, and / or • by measuring the current consumed by said geared motor, and / or • by measuring the load angle of said geared motor, further, said microcontroller can return to the vehicle ECU a message when said re-engagement sequence is completed and the system is operational.

[0012] According to a variant, said microcontroller returns a message to the vehicle's ECU when said re-engagement sequence is completed and the system is operational.

[0013] Advantageously, the coupling means of said connecting piece incorporates a singularity making it possible to angularly index the axis of the driven member.

[0014] Advantageously, said microcontroller of the geared motor is provided with an algorithm generating an opening or closing movement sequence, triggered by a detection of variation in position of said connecting part in reaction to a movement of the driven member generated by an external force.

[0015] Detailed description of a non-limiting example of embodiment

[0016] The present invention will be better understood on reading the following description, concerning a non-limiting example of embodiment illustrated by the appended drawings where:

[0017] [Fig.l] [Fig.l] represents a schematic view of a charging hatch equipped with a geared motor according to the invention,

[0018] [Fig.2] [Fig.2] represents a schematic top view of a geared motor according to the invention,

[0019] [Fig.3] [Fig.3] represents a perspective view of a geared motor according to the invention without its casing,

[0020] [Fig.4a] [Fig.4a] represents the toothed wheel of a torque limiter according to a first embodiment,

[0021] [Fig.4b] [Fig.4b] represents the connecting piece associated with the toothed wheel of the [Fig.4a] to form the torque limiter according to the first embodiment,

[0022] [Fig.5a],

[0023] [Fig.5b] Figures 5a and 5b represent exploded perspective views, respectively in incidence from above and below according to a first embodiment,

[0024] [Fig.6a] [Fig.6a] represents an axial view of the torque limiter according to the first embodiment when the parasitic force is less than the trigger value,

[0025] [Fig.6b] [Fig.6b] represents an axial view of the same torque limiter when the parasitic force is greater than the trigger value

[0026] [Fig.7a] [Fig.7a] represents an exploded view of a torque limiter according to a second variant of implementation,

[0027] [Fig.7b] [Fig.7b] represents an axial view of the torque limiter according to the second variant of implementation,

[0028] [Fig.8] [Fig.8] represents a perspective view of a torque limiter according to a third variant of implementation,

[0029] [Fig.9] [Fig.9] represents an exploded view of a torque limiter according to a fourth variant of implementation,

[0030] [Fig. 10a] [Fig. 10a] represents a perspective view of a geared motor according to a second embodiment variant,

[0031] [Fig.10b] [Fig.10b] represents a couple view of a geared motor according to the second embodiment variant,

[0032] [Fig. 11] [Fig. 11] represents a flowchart of a procedure for re-engaging the torque limiter according to the invention. General principle

[0033] The invention proposes to protect the mechanics and electronics of the actuator from an over-torque by disengaging the output shaft of the actuator from the last stage of the gearing thereof. This makes it possible to protect the mechanical components, such as the gear wheels, as well as the electronic components of the actuator. Thus, the active element is made invulnerable to these abnormal situations. It should be noted that a malfunction could also arise from to operate it and the invention similarly allows to protect the aggregates coupled to it.

[0034] [Fig.l] illustrates an example of the integration of a geared motor (10) according to the invention and arranged to move, between an open position and a closed position, the hatch (20) obscuring a space containing the charging socket (30) on board an electric vehicle. Such hatches (20) being projecting from the vehicle, are both accessible to the user, who can actuate them voluntarily or accidentally, but are also potentially subject to environmental mechanical constraints. It is thus essential to propose an actuation architecture capable of overcoming any degradation linked to unintended use. It is thus proposed to make the mechanical link between the rotor of the geared motor and the hatch (20) disengageable.

[0035] The invention proposes to integrate this additional functionality within the geared motor (10) while avoiding increasing its size. This provides a particularly integrated solution capable of being integrated into existing systems lacking this functionality, without requiring modification of the mechanical connection between the output of the geared motor (10) and the hatch (20) of the vehicle.

[0036] The aim of the invention is to support the additional function, namely the clutch, by a compact part, having a size close to that of a usual output toothed wheel of a geared motor, and allowing the nominal torque to be transmitted without slipping and without disturbance, but preventing the transmission to the reduction chain, and to the actuator, of untimely torques exerted on the driven member, here the trapdoor (20).

[0037] Figures 2 to 5b relate to a first embodiment according to the invention, [Fig.2] showing a transverse top view of the geared motor (10) from which the cover has been removed, [Fig.3] showing a perspective view from below of the geared motor without its housing and allowing a better appreciation of the reduction chain, Figures 4a and 4b showing separately the two elements of the output wheel (250) of the geared motor allowing a disengageable coupling and finally Figures 5a and 5b show exploded perspective views of the two elements of the output wheel respectively in top and bottom orientation.

[0038] As more visible in [Fig.2] and 3, the geared motor (10) is in the form of a housing (500) integrating an electric motor (100), consisting of a stator (120) and a rotor (110) coupled to a reduction chain (200) whose output wheel (250), provided with the additional function, is more particularly described in [Fig.4a] and 4b. The housing (500) further integrates an electronic card (300) having the means for controlling the coils (121) of the stator (120) and connected to a connector (400) to ensure the supply of electrical power to this electronic card (300) and to provide a communication channel with the ECU of the vehicle, via a LIN protocol for example. In the example illustrated, the reduction chain is a straight train consisting of 4 stages. This straight train is provided with three stages of pinion / toothed wheel assemblies (210, 220, 230) each mounted in free rotation on an axis (211, 221, 231), themselves mounted fixed in the bottom of the housing (500) for one end and in the cover (510) for its other end. All of the axes (211, 221, 231) being distributed in the transverse plane of the housing, all being parallel to the axis (111) of the rotor (110) and to the shaft (251) of the output wheel (250).

[0039] As presented more particularly in figures 4a, 4b, 5a and 5b, and in order to ensure the disengagement function, the output wheel (250) comprises a peripheral part provided with teeth (268) in the form of a toothed crown (260), surrounding a connecting part (270) elastically deformable to form a torque limiter (240). The toothed crown (260) has a wall (261) closing one of its axial ends, this wall (261) being perforated by a disc light (262) concentric with the toothed crown (260), said disc light being capable of receiving a cylindrical protuberance (278) of the connecting part (270) to ensure its rotational guidance. Said toothed crown (260) also has an annular surface (263) alternating: - smooth segments (264) of radius R] each extending over an angle a and - N torque transmission stops (265), N being equal to 5 in the example presented, each extending over an angle [3 and between said radius R\ and a radius R2, with R^R2.

[0040] The N torque transmission stops (265) are all identical and regularly distributed around the periphery of the annular surface (263) at an angle a + so that 2V x (a + ^) = 360 0 • In the example presented, each of said torque transmission stops (265) has a turning point (266) adjacent to the radius R2.

[0041] The connecting piece (270) also has a cylindrical geometry, it is provided with an annular shape (271) connected to a hub (272) by rigid radial arms (273). The hub (272) extends axially on either side of the annular shape (271) in the form of cylindrical protuberances (278, 279). These cylindrical protuberances (278, 279) each cooperate with a guide means respectively located in the bottom of the housing (500) and in its cover, to ensure the rotational guidance of the output wheel (250). The cylindrical protrusions (278, 279) also have a coupling means (276) with the member to be driven. [Fig. 5a] illustrates the coupling means in the form of a cavity with a star pattern, but this shape is in no way limiting of the invention and any means known to those skilled in the art for transmitting torque is envisaged. For example [Fig. 4b] shows that this coupling means can have indexing by a flat so that only one orientation of the coupling means relative to the application is possible.

[0042] The assembly of the output wheel is therefore done by axial insertion of the connecting piece (270) into the toothed crown (260), the protuberance (278) penetrating the disc light (262) until the annular shape (271) of the connecting piece (270) is axially abutted against the wall (261) of the toothed crown (260). A third alternative embodiment of the torque limiter (240) is presented in [Fig. 9], the latter differs from the first embodiment, presented for example in Figure 5, in that the deformable elements are not supported by the connecting piece (270) but by the toothed crown (260). This toothed crown (260) thus has rigid radial arms (273) extending in the direction of the connecting piece (270) and are linked two by two by the elastically deformable zones (274) to form the annular surface (263).The radial protrusions (275) are located in the elastically deformable zones (274) and extend towards the connecting piece (270). The torque transmission stops (265), in which the radial protrusions (275) engage, are directly integrated into the hub (272) of the connecting piece (270).

[0043] In all of the examples illustrated, the radial protrusions (275) are an integral part of the elastically deformable zones (274), whether the latter are supported by the toothed crown (260) or by the connecting piece (270). Nevertheless, this is for illustration purposes and the person skilled in the art could easily envisage configurations where the torque transmission stops are housings located in the elastically deformable zones and where the radial protrusions (275) project from a rigid part. The important thing to achieve the desired disengagement is that the toothed crown (260) and the connecting piece (270) have mating coupling means and that the coupling means of at least one of the two pieces can move radially from a certain torque to allow the relative rotational movement of the annular crown (260) relative to the connecting piece (270).

[0044] Note that the figures systematically show a connecting piece (270) inserted inside the toothed crown (260), which is in no way limiting of the invention and the person skilled in the art could easily imagine that the toothed crown (260) could be integrated within the connecting piece (270), in particular when the reduction of movement is done by means of an epicyclic type reducer. Also, the different figures illustrate a coupling for which the elastically deformable element (274) is integral with the connecting piece (270) and the torque transmission stops (265) integral with the toothed wheel (260), however the person skilled in the art could imagine the opposite situation. These two examples illustrate also the possibility, not shown, that the radius locating the radial position of the radial protrusions (275) in the deformed state allowing sliding on the annular surface (263) of the toothed crown (260), is greater than the radius R2 locating the radial position of the radial protrusions (275) in the rest state.

[0045] Detection of the effective position of the driven member

[0046] The invention also relates to the detection of the actual position of the driven member. This position cannot be deduced by simply reading the information provided by a sensor integrated in the geared motor. Indeed, different circumstances can introduce biases such as: - Play in gear trains which can reach several angular degrees, - triggering of the torque limiter, - interruption of the power supply to the geared motor, - slippage in the torque limiter.

[0047] One solution would consist of providing a position sensor directly linked to the driven member, which requires an additional component (end-of-travel sensor, etc.), wiring of this component, and positioning which is sometimes difficult in the operating context of the driven member.

[0048] The invention consists in integrating the function of detecting the effective position of the driven member, by an absolute position sensor arranged downstream of the torque limiter, into the kinematic chain, which makes it possible to ensure that the position detected by this angular sensor is free from all the error factors mentioned above.

[0049] Figures 10a and 10b represent an exemplary embodiment of a torque limiter allowing the measurement of the absolute position. For this purpose, an annular coding magnet (280) is secured to the connecting part (270) so as to move in direct connection with the output of the actuator which is mechanically linked to the member to be driven. The magnetic field of this coding magnet (280) is measured using a magneto-sensitive probe (320) arranged on a planar protrusion (310) of the electronic card (300) and opposite this coding magnet. The coding magnet (280) may for example have a rotating magnetization, according to the teachings of patent application WO2007099238A1, so as to provide an absolute position over one revolution.

[0050] The coding magnet (280) is inserted around the annular shape (271) of the hub (272) until it is axially abutted against the rigid radial arms (273). Multiple lugs (285) extending radially from the annular shape (271) beyond the inner diameter of the encoder magnet (280), are elastically deformed during insertion of the encoder magnet and allow the latter to be axially retained when it reaches its final axial position.

[0051] External activation of the movement of the driven member

[0052] Another solution proposed by the invention concerns the activation of the movement of the driven member, by manual action on the latter when the geared motor is stopped. A movement propagates to the connecting part (270) secured to the encoder magnet (280). The movement of the encoder magnet (280) can be captured by the magneto-sensitive probe (320) to produce an electrical signal processed by a detection circuit.

[0053] It is also conceivable that this operation is carried out in very low consumption mode, the magneto-sensitive probe being able to have a very low consumption mode and be associated with a microcontroller equipped with a wake-up function. Thus, during phases where the vehicle is not in operation, it is admissible that low-consumption functions continue to be functional. The probe is therefore always powered by consuming a few microwatts and can, when detecting a movement, wake up the microcontroller, which is more energy-hungry, to trigger the movement sequence of the member driven by the actuator.

[0054] This movement sequence may for example be the opening or closing of a motorized hatch when the user presses on this hatch.

[0055] This provides a function that consumes very little energy on average, but which may occasionally require a greater quantity of resources. Torque limiter trigger detection

[0056] The invention provides a procedure for detecting the triggering of the torque limiter. This procedure is based on measuring the variations in position of the connecting part (270) relative to that of the toothed crown (260). If these two relative positions do not change synchronously and proportionally, then the dedicated algorithm in the microcontroller can conclude that there is a loss of synchronism between these two elements, and therefore that the torque limiter is triggered.The variations in relative position between the toothed crown (260) with respect to the connecting piece (270) can be obtained using the addition of a second absolute position sensor on the toothed wheel (260) and by comparing the signals supplied by the two sensors, but it is also possible to obtain the position of the toothed wheel (260) using the position information of the rotor (110), obtained using the switching probes of the electrical phase supply, and by knowing the kinematic reduction ratio between the two toothed wheel (260) and the rotor (110). Torque Limiter Re-Engagement Procedure

[0057] As shown in Figure 10, the invention also provides a procedure for re-engaging the torque limiter. This procedure is based on the information from the absolute position of the connecting part (270), as well as a direct or indirect measurement of the mechanical load applied to the actuator.

[0058] The procedure consists of bringing the driven member into a stop of the system (for example, into the closing stop), so as to lock its position, then forcing a movement at the rotor (110), so as to rotate the toothed wheel (260) until reaching the position where the torque transmission stops (265) of the toothed wheel (260) engage with the radial protrusions (275) of the connecting piece (270).

[0059] The flowchart in Figure 10 is broken down as follows: - Step 1000: The actuator performs a stop movement on one of the system stops. - Test 1001: Is the measurement of the absolute position of the organ that of a system stop? • If not: as long as the duration of step 1000 is less than a predetermined duration (of the order of a second), step 1000 is continued; if it is greater than this duration, then the actuator returns to step 1010 during which the actuator stops the stop movement and informs the vehicle's ECU that the torque limitation system is faulty. • If yes: the program goes to step 1002. - Step 1002: The actuator performs the same stop movement as that performed in step 1000. - Test 1003: Does the load measurement correspond to the nominal maximum torque? • If not: as long as the duration of step 1002 is less than a predetermined duration (of the order of a second), step 1002 is continued; if it is greater than this duration, then the actuator returns to step 1020 during which the actuator stops the stop movement and informs the vehicle's ECU that the torque limitation system is faulty. • If yes: the program goes to step 1004. - Step 1004: The actuator stops the stop movement and informs the vehicle's ECU that the torque limiting system is re-engaged and that the component to be driven is in the stop position.

Claims

Claims

1. Geared motor (10) having an output toothed wheel (250) provided with a toothed crown (260), constituting the last meshing stage of the movement reducer (200) of said geared motor, associated with an elastically deformable connecting piece (270) characterized in that: One of said toothed crown (260) or connecting piece (270) has an annular surface (263) alternating • smooth segments of radius R\ each extending over an angle of a degrees and • torque transmission stops (265) of radius R^ each extending over an angle of degrees whose turning points (266) are spaced apart by an angle equal to a + fi degrees • with R] & R2 The other of said toothed crown (260) or connecting piece (270) having radial protrusions (275), each carried by an elastically deformable zone (274) radially,able to move between a radius R2 at rest and a radius Ri when the torque applied between said toothed crown (260) and said connecting piece (270) exceeds a reference value Cmax.,

2. Geared motor according to claim 1 characterized in that the number V torque transmission stops (265) of said toothed crown (260) is an integer multiple of the number of radial protrusions (275) of said connecting piece (270).

3. Geared motor according to claim 1 characterized in that said connecting piece (270) has an annular shape (271) extended radially by radial arms (273) with a pitch of <5 degrees, two successive radial arms being connected at their radial end by said elastically deformable zones (274).

4. Geared motor according to claim 1, 2 or 3 characterized in that said elastically deformable zones (274) are symmetrical with respect to at least one radial plane.

5. Geared motor according to claim 1, 2 or 3 characterized in that said toothed crown (260) has V torque transmission stops (265), with V between 3 and 10, and preferably equal to 5.

6. Geared motor according to claim 1, 2 or 3 characterized in that it comprises spring blades (277) arranged tangentially and each facing a radial protrusion (275), said radial protrusions (275) being extended radially in the direction of the spring blade (277) facing it, until it comes into contact, by a support zone (281).

7. Geared motor according to claim 1, 2 or 3 characterized in that said connecting piece (270) is formed by a tubular coupling sleeve having radial rigid arms, and an outer crown formed by deformable beams each extending tangentially between the ends of two consecutive rigid arms.

8. Geared motor according to claim 1 characterized in that the radius R 2 is greater than the radius Ri and in that said elastically deformable zones (274) are constituted by spring blades (277) extending tangentially relative to a radial arm (273), the ends of said spring blades (277) having radial protrusions (275) extending over an arc of P degrees.

9. Geared motor according to the preceding claim, characterized in that the angular difference between the deformations of two consecutive spring blades (277) is a multiple of a + fi.

10. Geared motor according to one of the preceding claims, characterized in that said connecting piece (270) is integral with a magnet (280) and in that said geared motor comprises a magneto-sensitive probe (320) positioned in a part swept by said magnet (280) during rotation of said connecting piece (270).

11. Geared motor according to one of the preceding claims, characterized in that it comprises a means for detecting variations in the relative position of the toothed wheel (260) with respect to the connecting part (270), provided by at least one sensor.

12. Geared motor according to the preceding claim, characterized in that the geared motor is provided with a microcontroller executing an algorithm for comparing variations in the relative position of said connecting piece (270) with variations in the relative position of said rotor (110), to determine a loss of synchronism between said connecting piece (270) and said toothed crown (260).

13. Geared motor according to the preceding claim characterized in that said microcontroller returns to the ECU of the vehicle a error message when said algorithm determines a loss of synchronism between said connecting part (270) and said toothed crown (260).

14. Geared motor according to claim 12 characterized in that said microcontroller has a re-engagement sequence consisting of controlling a movement of the rotor (110) generating a movement of the toothed crown (260), when the driven member is resting on a stop, said sequence ending when the torque transmission stops (265) of the toothed crown (260) engage with the torque transmission stops (275) of said connecting piece (270).

15. Geared motor according to the preceding claim, characterized in that the detection of re-engagement of the torque transmission stops (265) of the toothed crown (260) with the radial protrusions (275) of said connecting piece (270) is carried out by - a comparison of the variations in relative position of said connecting piece (270) with respect to variations in relative position of said rotor (110), and / or - by a measurement of the current consumed by said geared motor, and / or - by a measurement of the load angle of said geared motor.

16. Geared motor according to the preceding claim characterized in that said microcontroller returns a message to the vehicle's ECU when said re-engagement sequence is completed and the system is operational.

17. Geared motor according to one of the preceding claims, characterized in that the coupling means (276) of said connecting piece (270) incorporates a singularity making it possible to angularly index the axis of the driven member.

18. Geared motor according to one of the preceding claims, characterized in that said microcontroller of the geared motor is provided with an algorithm generating an opening or closing movement sequence, triggered by a detection of variation in position of said connecting part (270) in reaction to a movement of the driven member generated by an external force.

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