Electromechanical actuator and darkening device with such an electromechanical actuator

Description

[0001] The present invention relates to an electromechanical actuator for a blackout device, in other words an electromechanical actuator for a blackout device.

[0002] The present invention also relates to a blackout device comprising a screen driven in movement by such an electromechanical actuator.

[0003] In general, the present invention relates to the field of blackout devices comprising a motorized drive device moving a screen, between at least a first position and at least a second position.

[0004] A motorized drive device includes an electromechanical actuator of a movable closing, obscuring or sun protection element such as a shutter, a door, a grille, a blind or any other equivalent material, hereafter referred to as a screen.

[0005] We already know of document CN 202 431 792 U, which describes an electromechanical actuator for a blinding device. The electromechanical actuator comprises a housing, an electric motor, a gearbox, a spring brake, and a centering shaft. The gearbox comprises a first reduction stage, a second reduction stage, and a third reduction stage. The second reduction stage comprises a sun gear and a plurality of planet gears. The sun gear includes a bore. The electric motor, the gearbox, and the spring brake are mounted inside the housing. The spring brake comprises a helical spring, a drum, an input member, and an output member. The drum includes a friction surface. The friction surface is configured to cooperate with at least one turn of the helical spring. The input member includes a bore. The output member includes a bore.In addition, the centering shaft is mounted inside the bore of the input member, the bore of the output member and the bore of the solar pinion.

[0006] Furthermore, in this document CN 202 431 792 U, the output member of the spring brake and the solar pinion of the second reduction stage form a single piece, so that the bore of the output member and the bore of the solar pinion of the second reduction stage are common and form a single bore.

[0007] However, this electromechanical actuator has the disadvantage that, when assembling the reducer with the spring brake, the output member is not centered relative to the input member inside the spring brake, until the centering shaft is inserted into the bore of the input member, the bore of the output member and the bore of the solar pinion of the second reduction stage.

[0008] In addition, the press fitting of the centering shaft into the bore of the solar pinion of the second reduction stage and into the bore of the spring brake input member constrains the operation of the spring brake, which may cause operating noise and / or degrade its efficiency.

[0009] The present invention aims to resolve the aforementioned drawbacks and to provide an electromechanical actuator for a shading device, as well as a shading device comprising such an electromechanical actuator, including a reducer and a spring brake where, when assembling the reducer with the spring brake, an output member of the spring brake is centered inside the spring brake, even when a centering shaft of the electromechanical actuator is not inserted into a first bore of an input member of the spring brake, into a first bore of the output member and into a bore of a solar pinion of a reduction stage of the reducer.

[0010] In this regard, the present invention relates, according to a first aspect, to an electromechanical actuator for a blackout device, the electromechanical actuator comprising at least: a housing, an electric motor, a reducer, the reducer comprising at least one reduction stage, the reduction stage comprising a sun pinion and a plurality of planet pinions, the sun pinion comprising at least one bore, a spring brake, and a centering shaft, the electric motor, the reducer and the spring brake being mounted inside the housing, the spring brake comprising at least: a helical spring, a drum, the drum comprising a friction surface, the friction surface being configured to cooperate with at least one turn of the helical spring, an input member, the input member comprising at least one first bore, and an output member, the output member comprising a first bore, the centering shaft being mounted inside the first bore of the output member and the bore of the sun pinion.

[0011] According to the invention, the output member comprises at least one second bore. The spring brake further comprises a bearing, the bearing having at least one bore, the centering shaft being mounted inside the bore of the bearing. The bearing is mounted inside the first bore of the input member with an interference fit. Furthermore, the bearing is mounted inside the second bore of the output member with a loose fit.

[0012] Thus, this construction of the electromechanical actuator, where the spring brake is equipped with the bearing mounted inside the first bore of the input member and inside the second bore of the output member, allows, when assembling the reducer with the spring brake, the output member to be centered relative to the input member inside the spring brake, even when the centering shaft is not inserted in the first bore of the input member, in the bore of the bearing, in the first bore of the output member and in the bore of the solar pinion of the reduction stage of the reducer.

[0013] In addition, the bearing ensures precise centering of the centering shaft inside the spring brake and reduction stage.

[0014] According to an advantageous feature of the invention, the drum comprises a housing, the housing being cylindrical in shape. The friction surface is an internal surface of the drum radially delimiting the housing. Furthermore, the friction surface of the drum has a diameter less than or equal to forty-five millimeters.

[0015] According to another advantageous feature of the invention, the reduction stage further comprises a planet carrier, the planet carrier having at least one bore. The reducer further comprises another reduction stage, the other reduction stage comprising another sun gear, a plurality of other planet gears, and another planet carrier, the other sun gear having at least one bore, the other planet carrier having at least one bore. In addition, the centering shaft is mounted inside the bore of the planet carrier of the reduction stage, the bore of the other sun gear of the other reduction stage, and the bore of the other planet carrier of the other reduction stage.

[0016] According to another advantageous feature of the invention, the input member further comprises a second bore. The centering shaft is mounted with a loose fit inside the second bore of the input member. The centering shaft is mounted with an interference fit inside the bore of the other planet carrier of the other reduction stage. In addition, the centering shaft is mounted with a loose fit inside the first bore of the output member.

[0017] According to another advantageous feature of the invention, the planet carrier of the reduction stage includes a coupling interface. The output member includes a coupling interface. The coupling interface of the planet carrier of the reduction stage and the coupling interface of the output member are identical. The solar pinion of the reduction stage includes a first set of teeth. The other solar pinion of the other reduction stage includes a first set of teeth. Furthermore, the first set of teeth of the solar pinion of the reduction stage and the first set of teeth of the other solar pinion of the other reduction stage are identical.

[0018] According to another advantageous feature of the invention, the drum includes a shoulder. Furthermore, the planet carrier of the reduction stage is configured to bear against the shoulder of the drum.

[0019] According to another advantageous feature of the invention, the spring brake further comprises a cover. In addition, the shoulder of the drum acts as an axial stop for the planet carrier of the reduction stage relative to the drum, ensuring operating clearance between the cover and the planet carrier of the reduction stage.

[0020] According to another advantageous feature of the invention, the drum is made of steel or of a plastic material.

[0021] According to another advantageous feature of the invention, the planet carrier of the reduction stage is made of plastic material.

[0022] The present invention relates, according to a second aspect, to a blocking device, the blocking device comprising at least: a screen, and an electromechanical actuator according to the invention and as mentioned above, the screen being driven in movement by the electromechanical actuator.

[0023] This obscuring device has characteristics and advantages similar to those described previously, in relation to the electromechanical actuator according to the invention.

[0024] Other features and advantages of the invention will become apparent in the following description, made with reference to the accompanying drawings, given by way of non-limiting examples and in which: [ Fig 1 ] there figure 1 is a schematic cross-sectional view of an installation comprising a blackout device according to an embodiment of the invention; [ Fig 2 ] there figure 2 is a schematic perspective view of the installation illustrated in the figure 1 ; Fig 3 ] there figure 3 is a schematic perspective view of a motorized drive device of the installation illustrated in figures 1 And 2, this motorized drive device comprising an electromechanical actuator according to the invention and a winding tube; [ Fig 4 ] there figure 4 is a schematic cross-sectional view of the electromechanical actuator illustrated in the figure 3 , according to a cross-sectional plane passing through an axis of rotation of the electromechanical actuator, this schematic cross-sectional view being locally interrupted at two parts of the electromechanical actuator; [ Fig 5 ] there figure 5 is a schematic perspective and exploded view of part of the electromechanical actuator illustrated in the figure 4 ; Fig 6 ] there figure 6 is a schematic exploded and perspective view of a spring brake of the electromechanical actuator illustrated in figures 3 à 5 ; Fig 7 ] there figure 7 is a first schematic cross-sectional view of the spring brake illustrated in the figure 6 according to a cutting plane passing through the axis of rotation of the electromechanical actuator illustrated in figures 3 à 5 ; Fig 8 ] there figure 8 is a second schematic cross-sectional view of the spring brake illustrated in figures 6 And 7 according to a cutting plane perpendicular to the axis of rotation of the electromechanical actuator illustrated in figures 3 à 5 ; And [ Fig 9 ] there figure 9 is a schematic cross-sectional view, detailed and larger scaled, corresponding to box IX, of a part of the electromechanical actuator illustrated in the figure 4 .

[0025] First, we describe, with reference to figures 1 And 2An installation 6 comprising a closing, shading, or solar protection device 3 according to an embodiment of the invention. This installation 6, installed in a building B, has an opening 1, in which a window or door (not shown) is located. This installation 6 is equipped with a screen 2 belonging to the closing, shading, or solar protection device 3, in particular a motorized blind.

[0026] The closing, shading, or sun protection device 3 is hereinafter referred to as the "shading device." The shading device 3 comprises the screen 2.

[0027] The blackout device 3 may be a blind, in particular a blind comprising a roller fabric, a blind comprising a pleated or honeycomb screen, or a blind with adjustable slats, or a roller shutter. The present invention applies to all types of blackout devices.

[0028] Here, installation 6 includes the blackout device 3.

[0029] We describe, with reference to figures 1 And 2 , a roller blind conforming to an embodiment of the invention.

[0030] The shading device 3 includes a motorized drive device 5. The motorized drive device 5 includes an electromechanical actuator 11 illustrated in figures 3 à 5 .

[0031] The screen 2 is configured to be moved, in other words is moved, by means of the motorized drive device 5 and, more particularly, of the electromechanical actuator 11.

[0032] Advantageously, the motorized drive device 5 and, consequently, the shading device 3 further includes a winding tube 4. In addition, the winding tube 4 is arranged so as to be driven in rotation by the electromechanical actuator 11.

[0033] Here, screen 2 can be rolled up onto the winding tube 4.

[0034] Thus, the screen 2 of the occultation device 3 is wound on the winding tube 4 or unwound around it, the winding tube 4 being driven by the motorized drive device 5, in particular by the electromechanical actuator 11.

[0035] In this way, screen 2 is mobile between a rolled-up position, particularly high, and an unrolled position, particularly low, and vice versa.

[0036] The screen 2 of the shading device 3 is a closing, shading and / or sun protection screen, rolling and unrolling around the winding tube 4, the inner diameter of which is greater than the outer diameter of the electromechanical actuator 11, so that the electromechanical actuator 11 can be inserted into the winding tube 4, when assembling the shading device 3.

[0037] Advantageously, the occultation device 3 includes a holding device 9, 23.

[0038] Advantageously, the retaining device 9, 23 can include two supports 23. One support 23 is disposed at each end of the winding tube 4, particularly in an assembled configuration of the blackout device 3.

[0039] Thus, the winding tube 4 is held by means of the supports 23. Only one of the supports 23 is visible at the figure 1 and these are not represented at the figure 2 The supports 23 allow the shading device 3 to be mechanically linked to the structure of building B, in particular to a wall M of building B.

[0040] Advantageously, the retaining device 9, 23 can include a box 9. In addition, the winding tube 4 and at least part of the screen 2 are housed inside the box 9, particularly in the assembled configuration of the blackout device 3.

[0041] Generally, the box 9 is positioned above the opening 1, or in the upper part of the opening 1.

[0042] Here and as illustrated in the figure 1 , supports 23 are also housed inside box 9.

[0043] Advantageously, the box 9 includes two sides 10, as illustrated in the figure 2 . A cheek 10 is arranged at each end of the box 9, in particular in the assembled configuration of the occultation device 3.

[0044] Alternatively, represented at the figure 2 , the winding tube 4 is held via the box 9, in particular via the cheeks 10 of the box 9, without using supports, such as the supports 23 mentioned above.

[0045] Advantageously, the obscuring device 3 can also include two lateral slides 26, as illustrated only in the figure 2 Each side slide 26 includes a groove 29. Each groove 29 of one of the side slides 26 cooperates, or is configured to cooperate, with a side edge 2a of the screen 2, particularly in the assembled configuration of the blackout device 3, so as to guide the screen 2, when the screen 2 is wound and unwound around the winding tube 4.

[0046] The electromechanical actuator 11 is, for example, of the tubular type. This allows the winding tube 4 to be rotated around an axis of rotation X, so as to move, in particular unwind or wind up, the screen 2 of the occulting device 3.

[0047] In an assembled state of the occulting device 3, the electromechanical actuator 11 is inserted into the winding tube 4.

[0048] Advantageously, the blackout device 3 further includes a load bar 8 to exert tension on the screen 2.

[0049] The roller blind, which forms the blackout device 3, comprises a fabric, forming the screen 2 of the roller blind 3. A first end of the screen 2, in particular the upper end of the screen 2, in the assembled configuration of the blackout device 3, is fixed to the roller tube 4. In addition, a second end of the screen 2, in particular the lower end of the screen 2, in the assembled configuration of the blackout device 3, is fixed to the weight bar 8.

[0050] Here, the canvas forming screen 2 is made from a textile material.

[0051] In one embodiment, not shown, the first end of the screen 2 has a hem through which a rod, particularly made of plastic, is inserted. This hem at the first end of the screen 2 is created by stitching the fabric forming the screen 2. When assembling the screen 2 onto the roller tube 4, the hem and the rod at the first end of the screen 2 are slid into a groove on the outer face of the roller tube 4, specifically along the entire length of the roller tube 4, so as to secure the screen 2 to the roller tube 4 and to allow the screen 2 to be wound and unwound around the roller tube 4.

[0052] Regardless of the embodiment, the first end of the screen 2 is positioned at the level of the retaining device 9, 23.

[0053] In the case of a roller blind, the rolled-up high position corresponds to a predetermined upper limit position, or to the weight bar 8 of the screen 2 being pressed against an edge of the casing 9 of the roller blind 3, and the rolled-up low position corresponds to a predetermined lower limit position, or to the weight bar 8 of the screen 2 being pressed against a threshold 7 of the opening 1, or to the complete unrolling of the screen 2.

[0054] Advantageously, the motorized drive device 5 is controlled by a control unit. The control unit can be, for example, a local control unit 12 or a central control unit 13.

[0055] Advantageously, the local control unit 12 can be connected, via wired or wireless connection, to the central control unit 13.

[0056] Advantageously, the central control unit 13 can control the local control unit 12, as well as other similar local control units distributed throughout building B.

[0057] The motorized drive device 5 is preferably configured to execute movement commands, including unwinding or rolling, of the screen 2 of the shading device 3, which may be issued, in particular, by the local control unit 12 or the central control unit 13.

[0058] Installation 6 comprises either the local control unit 12, or the central control unit 13, or the local control unit 12 and the central control unit 13.

[0059] We now describe, in more detail and with reference to figures 3 à 5 , the motorized drive device 5, including the electromechanical actuator 11, belonging to the installation 6 and, more particularly, to the shading device 3 illustrated in figures 1 And 2 .

[0060] The electromechanical actuator 11 comprises a housing 17, in particular tubular, an electric motor 16 and a reducer 19.

[0061] Here, the electric motor 16 and the reducer 19 are housed, in other words mounted, inside the casing 17, in particular in an assembled configuration of the electromechanical actuator 11.

[0062] Advantageously, the electric motor 16 comprises a rotor 16a and a stator 16b, as illustrated in the figure 4 .

[0063] Here, the rotor 16a and the stator 16b are positioned coaxially around the axis of rotation X, which is also the axis of rotation of the winding tube 4 in the mounted configuration of the motorized drive device 5.

[0064] Advantageously, the electric motor 16 can be of the electronically commutated brushless type, also called "BLDC" (acronym for the Anglo-Saxon term BrushLess Direct Current) or "permanent magnet synchronous", of the direct current type or of the asynchronous type.

[0065] Advantageously, the rotor 16a of the electric motor 16 includes a shaft 53.

[0066] Here, the housing 17 is hollow. The housing 17 comprises a first end 17a and a second end 17b. The second end 17b is opposite the first end 17a.

[0067] Here, the housing 17 of the electromechanical actuator 11 is cylindrical in shape, in particular of revolution around the axis of rotation X, and is open at each of its ends 17a, 17b.

[0068] Advantageously, the housing 17 is a tube with a circular cross-section.

[0069] Here, the housing 17 is made of a metallic material.

[0070] The material of the electromechanical actuator housing is not limited and can vary. In particular, it can be a plastic material.

[0071] Control means for the electromechanical actuator 11, enabling the movement of the screen 2 of the occulting device 3, consist of at least one control unit 15, in particular an electronic control unit.

[0072] This control unit 15 belongs to the motorized drive device 5 and, more particularly, to the electromechanical actuator 11 and is capable of starting up the electric motor 16 of the electromechanical actuator 11 and, in particular, of enabling the supply of electrical energy to the electric motor 16.

[0073] Thus, the control unit 15 controls, in particular, the electric motor 16, so as to open or close the screen 2, as described previously.

[0074] The control means for the electromechanical actuator 11 include hardware and / or software means.

[0075] By way of example, and by no means limiting the application, the hardware may include at least one microcontroller 30, as illustrated in the figure 2 .

[0076] Advantageously, the control unit 15 further comprises a first communication module 27, as illustrated in the figure 2 , in particular receiving command orders, the command orders being issued by a command transmitter, such as the local control unit 12 or the central control unit 13, these orders being intended to control the motorized drive device 5.

[0077] Advantageously, the first communication module 27 of the control unit 15 is wireless. In particular, the first communication module 27 is configured to receive radio control commands.

[0078] Advantageously, the first communication module 27 can also allow the reception of command orders transmitted by wired means.

[0079] Advantageously, the control unit 15, the local control unit 12 and / or the central control unit 13 can be in communication with a weather station located inside building B or outside building B, including, in particular, one or more sensors that can be configured to determine, for example, temperature, brightness, or wind speed, in the case where the weather station is located outside building B.

[0080] Advantageously, the control unit 15, the local control unit 12 and / or the central control unit 13 can also communicate with a server 28, as illustrated in the figure 2 , so as to control the electromechanical actuator 11 according to data made available remotely via a communication network, in particular an internet network that can be connected to the server 28.

[0081] The control unit 15 can be operated from the local control unit 12 and / or the central control unit 13. The local control unit 12 and / or the central control unit 13 is equipped with a control keypad. The control keypad of the local control unit 12 or the central control unit 13 includes one or more selection elements 14 and, optionally, one or more display elements 34.

[0082] By way of example, and not exhaustively, selection elements can be push buttons and / or touch-sensitive keys. Display elements can be light-emitting diodes and / or a display, for example LCD (Liquid Crystal Display) or TFT (Thin Film Transistor). Selection and display elements can also be implemented using a touchscreen.

[0083] Advantageously, the local control unit 12 and / or the central control unit 13 includes at least one second communication module 36.

[0084] Thus, the second communication module 36 of the local control unit 12 or of the central control unit 13 is configured to transmit, in other words, sends out, control orders, in particular by wireless means, for example radioelectric, and / or by wired means.

[0085] In addition, the second communication module 36 of the local control unit 12 or of the central control unit 13 can also be configured to receive, in other words receives, control orders, in particular through the same means.

[0086] Advantageously, the second communication module 36 of the local control unit 12 or of the central control unit 13 is configured to communicate, in other words, communicates, with the first communication module 27 of the control unit 15.

[0087] Thus, the second communication module 36 of the local control unit 12 or of the central control unit 13 exchanges control orders with the first communication module 27 of the control unit 15, either unidirectionally or bidirectionally.

[0088] Advantageously, the local control unit 12 is a control point, which can be fixed or mobile. A fixed control point can be a control box intended to be fixed to a wall M of building B or to the face of a window or door frame. A mobile control point can be a remote control, a smartphone, or a tablet.

[0089] Advantageously, the local control unit 12 and / or the central control unit 13 further includes a controller 35.

[0090] The motorized drive device 5, in particular the control unit 15, is preferably configured to execute movement commands, including closing and opening, of the screen 2 of the shading device 3. These commands can be issued, in particular, by the local control unit 12 or by the central control unit 13.

[0091] The motorized drive device 5 can be controlled by the user, for example by receiving a command order corresponding to a press on the or one of the selection elements 14 of the local control unit 12 or of the central control unit 13.

[0092] The motorized drive device 5 can also be controlled automatically, for example by receiving a control command corresponding to at least one signal from at least one sensor, not shown, and / or a signal from a clock, not shown, of the control unit 15, in particular the microcontroller 30. The sensor and / or the clock can be integrated, alternatively, into the local control unit 12 or into the central control unit 13.

[0093] Advantageously, the electromechanical actuator 11 further comprises a crown 24, which can also be called a sleeve, as illustrated in the figure 4 .

[0094] The crown 24 is disposed, or rather configured to be disposed, in the vicinity of the first end 17a of the housing 17, in particular in the assembled configuration of the electromechanical actuator 11.

[0095] Advantageously, the motorized drive device 5 and, more particularly, the electromechanical actuator 11 further comprises a power supply cable 18, as illustrated in the figure 2 .

[0096] Advantageously, the control unit 15 can be supplied with electrical energy by means of the power cable 18 electrically connected to at least one source of electrical power supply, not shown, which may be, for example, an electrical power supply network, in particular from the mains or known as "PoE" (acronym for the Anglo-Saxon term Power over Ethernet), and / or to a battery, which may be rechargeable, in particular by means of a photovoltaic panel and / or a charger, not shown, or through the electrical power supply network.

[0097] Thus, the power supply cable 18 allows the electromechanical actuator 11, in particular the control unit 15 and the electric motor 16, to be supplied with electrical energy from the source(s) of electrical power supply.

[0098] Advantageously, the electromechanical actuator 11 further comprises an output shaft 20. In addition, the output shaft 20 of the electromechanical actuator 11 is disposed, that is to say, is configured to be disposed, in the vicinity of the second end 17b of the housing 17, particularly in the assembled configuration of the electromechanical actuator 11.

[0099] Advantageously, the output shaft 20 of the electromechanical actuator 11 is disposed inside the winding tube 4 and at least partly outside the housing 17 of the electromechanical actuator 11.

[0100] Advantageously, one end of the output shaft 20 of the electromechanical actuator 11 is projecting from the housing 17 of the electromechanical actuator 11, in particular from the second end 17b of the housing 17 opposite the first end 17a.

[0101] Advantageously, the output shaft 20 of the electromechanical actuator 11 is configured to drive in rotation a linking element, not shown, connected to the winding tube 4. The linking element is, for example, made in the form of a wheel.

[0102] When the electromechanical actuator 11 is switched on, the electric motor 16 and the reducer 19 drive the output shaft 20 of the electromechanical actuator 11 into rotation. In addition, the output shaft 20 of the electromechanical actuator 11 drives the winding tube 4 into rotation via the connecting element.

[0103] Thus, the winding tube 4 causes the screen 2 of the occulting device 3 to rotate, so as to open or close the opening 1.

[0104] The electromechanical actuator 11 further includes a spring brake 25.

[0105] The spring brake 25 is configured to brake and / or to lock in rotation the output shaft 20 of the electromechanical actuator 11, so as to regulate the rotational speed of the winding tube 4, during a movement of the screen 2, and to keep the winding tube 4 locked, when the electromechanical actuator 11 is electrically deactivated.

[0106] The spring brake 25 is housed, in other words mounted, inside the casing 17 of the electromechanical actuator 11, in particular in the assembled configuration of the electromechanical actuator 11.

[0107] The reducer 19 includes at least one reduction stage 37, 38, 39. The reduction stage 37, 38, 39, one of the reduction stages 37, 38, 39 or each of the reduction stages 37, 38, 39 is of epicycloidal type.

[0108] Here and as illustrated in the figure 4 The reducer 19 comprises three reduction stages 37, 38, 39. Each of the three reduction stages 37, 38, 39 is of the epicyclic type. The three reduction stages 37, 38, 39 are hereafter referred to as the first reduction stage 37, the second reduction stage 38, and the third reduction stage 39.

[0109] The number of reduction stages in the reducer is not limited. The number of reduction stages can be one, two, or four or more.

[0110] Here and as illustrated in the figure 4 , the spring brake 25 is configured to be disposed, in other words is disposed, between two reduction stages 37, 38, 39, in particular between the first reduction stage 37 and the second reduction stage 38 of the reducer 19, in particular in the assembled configuration of the electromechanical actuator 11.

[0111] Advantageously, the reducer 19 comprises a first end 19a and a second end 19b. The second end 19b is opposite the first end 19a. The first end 19a of the reducer 19 is positioned opposite the electric motor 16, that is, faces the electric motor 16, particularly in the assembled configuration of the electromechanical actuator 11. Furthermore, the second end 19b of the reducer 19 is positioned opposite the output shaft 20 of the electromechanical actuator 11, that is, faces the output shaft 20 of the electromechanical actuator 11, particularly in the assembled configuration of the electromechanical actuator 11.

[0112] Here, the first reduction stage 37 is located at the first end 19a of the reducer 19. The third reduction stage 39 is located at the second end 19b of the reducer 19. In addition, the second reduction stage 38 is located between the first reduction stage 37 and the third reduction stage 39 and, more specifically, between the spring brake 25 and the third reduction stage 39.

[0113] One or each of the first, second and third reduction stages 37, 38, 39 includes a solar pinion 40 and a plurality of satellite pinions 63, which may be, for example, three in number.

[0114] The solar pinion 40 and the satellite pinions 63 of the first reduction stage 37 can be called the first solar pinion and the first satellite pinions. The solar pinion and the satellite pinions of the second reduction stage 38 can be called the second solar pinion and the second satellite pinions. Furthermore, the solar pinion and the satellite pinions of the third reduction stage 39 can be called the third solar pinion and the third satellite pinions.

[0115] We denote X19 an axis of rotation of the reducer 19.

[0116] We note X40 as an axis of rotation of the or each solar pinion 40.

[0117] The rotation axis X40 of the solar pinion 40 coincides with the rotation axis X19 of the reducer 19. Therefore, the rotation axis X40 and the rotation axis X19 are represented by the same axis line in the figures.

[0118] Advantageously, the satellite gears 63 of the first, second and third reduction stages 37, 38, 39 are regularly distributed around the axis of rotation X19.

[0119] The number of planetary gears in the first, second, and third reduction stages is not limited and can vary. A single reduction stage can have two or more planetary gears.

[0120] Advantageously, the solar pinion 40 of the reduction stage(s) 37, 38, 39 comprises a first solar pinion portion and a second solar pinion portion. The first solar pinion portion includes a first toothed section 42. Furthermore, the second solar pinion portion includes a second toothed section 64.

[0121] Advantageously, for one or each of the reduction stages 37, 38, 39, the second toothing 64 of the second part of the solar pinion 40 is angularly offset by half a step relative to the first toothing 42 of the first part of the solar pinion 40, around the axis of rotation X40 of this solar pinion 40.

[0122] As an alternative, not shown, for one or each of the reduction stages 37, 38, 39, the second toothing 64 of the second part of the solar pinion 40 is angularly set, in other words does not have an angular offset, relative to the first toothing 42 of the first part of the solar pinion 40, around the axis of rotation X40 of this solar pinion 40.

[0123] Advantageously, in each of the first, second and third reduction stages 37, 38, 39, the solar pinion 40 is meshed, in other words is configured to mesh, with each satellite pinion 63 of this reduction stage 37, 38, 39, in particular in an assembled configuration of the reducer 19.

[0124] Advantageously, in each of the first, second and third reduction stages 37, 38, 39, the satellite gears 63 are identical, at least by groups of satellite gears of a reduction stage 37, 38, 39.

[0125] Advantageously, in each of the first, second and third reduction stages 37, 38, 39, the satellite pinions 63 are eccentric with respect to the axis of rotation X19 of the reducer 19 and, more particularly, with respect to the solar pinion 40 of this reduction stage 37, 38, 39, especially in the assembled configuration of the reducer 19.

[0126] Thus, for a given reduction stage 37, 38, 39, an axis of rotation of each satellite pinion 63 is parallel to, and radially offset from, the axis of rotation X19 of the reducer 19 and, more particularly, parallel to, and radially offset from, the axis of rotation X40 of the solar pinion 40.

[0127] Advantageously, the reducer 19 further includes an input shaft 43.

[0128] Here and as illustrated in figures 4 And 5 , a shaft 59 of the solar pinion 40 of the first reduction stage 37 constitutes the input shaft 43 of the reducer 19.

[0129] Alternatively, not shown, the solar pinion 40 of the first reduction stage 37 is carried by the input shaft 43 of the reducer 19.

[0130] Thus, whatever the example of realization, the solar pinion 40 of the first stage of reduction 37 is integral with the input shaft 43 of the reducer 19.

[0131] Advantageously, the reducer 19 further includes an output shaft 67.

[0132] Here, the output shaft 67 of the reducer 19 is disposed, or rather configured to be disposed, inside the output shaft 20 of the electromechanical actuator 11, in particular in the assembled configuration of the electromechanical actuator 11.

[0133] Alternatively, not shown, the output shaft 20 of the electromechanical actuator 11 constitutes the output shaft 67 of the reducer 19.

[0134] Advantageously, the input shaft 43 and the output shaft 67 of the reducer 19 are coaxial, that is to say, are configured to be coaxial, particularly in the assembled configuration of the reducer 19.

[0135] Thus, the input shaft 43 and the output shaft 67 of the reducer 19 are arranged along the same axis of rotation X19, which is also the axis of rotation of the reducer 19, in particular in the assembled configuration of the reducer 19.

[0136] Advantageously, the reducer 19 further includes at least one crown 65. The crown or each of the crowns 65 includes an internal toothing.

[0137] Here, the reducer 19 comprises two rings 65. One of the two rings 65 is formed by combining a second ring from the second reduction stage 38 with a third ring from the third reduction stage 39. This ring 65 is not shown on the figures 4 , 5 And 9In this case, the satellite gears 63 of the second and third reduction stages 38, 39 are meshed, that is, configured to mesh, with the same ring gear 65, particularly in the assembled configuration of the reducer 19. In this case, this single ring gear 65 belongs to both the second and third reduction stages 38, 39. Furthermore, in this case, the other of the two ring gears 65, shown in figures 4 And 5 , is formed by the first ring of the first stage of reduction 37.

[0138] Advantageously, the first ring of the first stage of reduction 37 is made of either steel or plastic.

[0139] As a non-limiting example, the steel of the first ring of the first stage of reduction 37 is sintered steel.

[0140] As a non-limiting example, the plastic material of the first ring of the first reduction stage 37 is polybutylene terephthalate, also called PBT, or polyacetal, also called POM.

[0141] Alternatively, not shown, one of the two rings 65 is formed by combining a first ring from the first reduction stage 37 with a second ring from the second reduction stage 38. In this case, the planetary gears 63 of the first and second reduction stages 37, 38 are meshed, that is, configured to mesh, with the same ring 65, particularly in the assembled configuration of the reducer 19. In this case, this single ring 65 belongs to both the first and second reduction stages 37, 38. Furthermore, in this case, the other of the two rings 65 is formed by a third ring from the third reduction stage 39.

[0142] Alternatively, and not shown, the reducer 19 comprises three ring gears 65. These three ring gears 65 can be called the first ring gear, second ring gear, and third ring gear. Each planetary gear 63 of each of the first, second, and third reduction stages 37, 38, 39 is meshed, or configured to mesh, with the ring gear 65, specifically with the internal teeth of the ring gear 65, of that reduction stage 37, 38, 39, particularly in the assembled configuration of the reducer 19. In this case, the first, second, and third ring gears 65 belong respectively to one of the first, second, and third reduction stages 37, 38, 39.

[0143] In another variant, not shown, the reducer 19 comprises a single ring gear 65. In this case, the planetary gears 63 of each of the first, second and third reduction stages 37, 38, 39 are meshed, that is to say, are configured to mesh, with the single ring gear 65, in particular with the internal teeth of the single ring gear 65, in particular in the assembled configuration of the reducer 19. In this case, this single ring gear 65 belongs to the first, second and third reduction stages 37, 38, 39.

[0144] Advantageously, each of the first, second and third reduction stages 37, 38, 39 also includes a satellite carrier 66.

[0145] Advantageously, the planet carrier 66 of the second reduction stage 38 includes a coupling interface 89. In addition, the coupling interface 89 of the planet carrier 66 of the second reduction stage 38 cooperates, or is configured to cooperate, with the solar pinion 40 of the third reduction stage 39, particularly in the assembled configuration of the electromechanical actuator 11.

[0146] Here, the coupling interface 89 of the planet carrier 66 of the second reduction stage 38 is an internal toothed gear. Furthermore, particularly in the assembled configuration of the electromechanical actuator 11, the coupling interface 89 of the planet carrier 66 of the second reduction stage 38 meshes, or is configured to mesh, with the solar pinion 40 of the third reduction stage 39, specifically with the first toothed gear 42 of the solar pinion 40 of the third reduction stage 39.

[0147] Thus, the coupling interface 89 of the satellite carrier 66 of the second reduction stage 38 allows to receive and transmit a torque from the electric motor 16 and, in this case, from the second reduction stage 38 to the third reduction stage 39.

[0148] Advantageously, the satellite carrier 66 of the second stage of reduction 38 is made of plastic material.

[0149] As a non-limiting example, the plastic material of the satellite carrier 66 of the second reduction stage 38 is polybutylene terephthalate, also called PBT, or polyacetal, also called POM.

[0150] Advantageously, the planet carrier 66 of the third reduction stage 39 is integral with the output shaft 67 of the reducer 19.

[0151] Thus, the output shaft 67 of the reducer 19 is driven in rotation, in particular via the planet carrier 66 of the third reduction stage 39, when the input shaft 43 of the reducer 19 is driven in rotation, in particular during an electrical activation of the electric motor 16 causing the rotor 16a to be driven in rotation.

[0152] In one embodiment, the planet carrier 66 of the third reduction stage 39 and the output shaft 67 of the gearbox 19 are two separate parts. In this case, in the assembled configuration of the gearbox 19, the two parts are connected, or configured to be connected, by means of removable fastening elements. By way of non-limiting examples, the fastening elements may be of the snap-fit ​​or screw type.

[0153] Alternatively, and not shown, the planet carrier 66 of the third reduction stage 39 and the output shaft 67 of the reducer 19 form a single piece, which can be manufactured, for example, by sintering. This piece can be made, in particular, from a plastic or a metallic material.

[0154] Advantageously, the reducer 19 comprises a first cover 44 and a second cover 45. The first cover 44 is disposed at the first end 19a of the reducer 19. Furthermore, the second cover 45 is disposed at the second end 19b of the reducer 19.

[0155] In one embodiment, the first cover 44 and the ring 65 of the first reduction stage 37 form two separate parts. Furthermore, the second cover 45 and the ring 65 of the third reduction stage 39 also form two separate parts. In this case, in the assembled configuration of the reducer 19, the two parts are connected, or configured to be connected together, either by press-fitting, overmolding, or by means of removable fasteners. By way of non-limiting examples, the fasteners may be of the snap-fit ​​or screw type.

[0156] Here, the second cover 45 and the crown 65 of the second reduction stage 38 and the third reduction stage 39 form two separate parts.

[0157] Alternatively, and not shown, in the assembled configuration of the reducer 19, the first cover 44 is integrated into the ring 65 of the first reduction stage 37, so as to form a single piece. Furthermore, the second cover 45 is integrated into the ring 65 of the third reduction stage 39, so as to form a single piece. In this case, the single piece can be manufactured, for example, by sintering. This piece can be made, in particular, of a plastic or a metallic material.

[0158] Advantageously, in the assembled configuration of the reducer 19, the first cover 44 is fixed, or rather configured to be fixed, to the second cover 45 by means of fastening elements 46, only one of which is shown in the figure 5 , in particular in the assembled configuration of reducer 19.

[0159] Here, the fixing elements 46 are elastic snap-fit ​​fixing elements, two in number and arranged diametrically opposite with respect to the axis of rotation X19, in other words at 180° to each other, around the axis of rotation X19.

[0160] The number and type of fasteners are not limited and can vary. For example, there could be three fasteners arranged at 120° angles to each other around the gearbox's axis of rotation. They could also be, for example, screw-type fasteners.

[0161] Advantageously, in the assembled configuration of the reducer 19, the spring brake 25 is held, or rather is configured to be held, by the first and second covers 44, 45, by means of indexing elements 47, only one of which is visible at the figure 5 .

[0162] Here, the indexing elements 47 are rotational locking elements, around the rotation axis X19, such as projecting elements cooperating with correspondingly shaped notches. These indexing elements 47 are two in number and arranged diametrically opposite each other with respect to the rotation axis X19, that is to say, 180° apart, around the rotation axis X19.

[0163] The number and type of locking elements are not limited and can vary. For example, there could be three of them, arranged at an angle of 120° to each other, around the axis of rotation of the reducer.

[0164] Advantageously, the reducer 19 may further include a retaining ring, not shown. The retaining ring is fixed, or rather configured to be fixed, to the housing 17 of the electromechanical actuator 11 by means of at least one retaining element, not shown.

[0165] The fixing ring can be fixed to the housing 17 by means of a fixing screw, not shown, passing through a through hole, not shown, provided in the housing 17 and screwing into a fixing hole of the fixing ring.

[0166] The number and type of fasteners for the retaining ring to the housing are not limited. There may be, for example, two or more. They may also be, for example, riveted fasteners.

[0167] Advantageously, the electromechanical actuator 11 further includes a device for detecting end of travel and / or obstacle during the movement of the screen 2. This device can be mechanical or electronic.

[0168] Advantageously, the end-of-travel and / or obstacle detection device is implemented by means of the microcontroller 30 of the control unit 15 and, in particular, by means of an algorithm implemented by this microcontroller 30.

[0169] The winding tube 4 is driven in rotation around the axis of rotation X and the housing 17 of the electromechanical actuator 11, supported by two pivot joints. The first pivot joint is located at one end of the winding tube 4 by means of the ring 24. The ring 24 thus provides a bearing. The second pivot joint, not shown, is located at the other end of the winding tube 4, opposite the first end.

[0170] The crown 24 forms, in other words is configured to form or constitute, a bearing for the rotational guidance of the winding tube 4, around the housing 17 of the electromechanical actuator 11, in particular in an assembled configuration of the motorized drive device 5 and, consequently, of the occulting device 3.

[0171] Advantageously, the electromechanical actuator 11 further includes a torque support 21.

[0172] Here, the torque support 21 is arranged at the first end 17a of the housing 17 of the electromechanical actuator 11, in particular in the assembled configuration of the electromechanical actuator 11.

[0173] The torque support 21 allows the forces exerted by the electromechanical actuator 11 to be absorbed, in particular the torque exerted by the electromechanical actuator 11, with respect to the structure of building B. The torque support 21 advantageously allows the forces exerted by the winding tube 4 to be absorbed, in addition, in particular the weight of the winding tube 4, the electromechanical actuator 11 and the screen 2, and ensures that these forces are absorbed by the structure of building B.

[0174] Thus, the torque support 21 allows the electromechanical actuator 11 to be fixed on the retaining device 9, 23, in particular to one of the supports 23 or to one of the cheeks 10 of the casing 9.

[0175] Advantageously, the torque support 21 protrudes at the first end 17a of the housing 17 of the electromechanical actuator 11.

[0176] Advantageously, the torque support 21 closes, in other words is configured to close, the first end 17a of the housing 17, particularly in the assembled configuration of the electromechanical actuator 11.

[0177] Furthermore, the torque support 21 of the electromechanical actuator 11 can support at least part of the control unit 15.

[0178] Advantageously, the torque support 21 is fixed to the housing 17 by means of one or more fasteners, not shown, particularly in the assembled configuration of the electromechanical actuator 11. The fastener(s) may be, in particular, bosses, fixing screws, snap-fit ​​fasteners, grooves fitted into notches or a combination of these different fasteners.

[0179] Advantageously, the torque support 21 comprises a first part 21a, which can also be called a "fixed point", and a second part 21b, which can also be called an "actuator head".

[0180] Advantageously, the first part 21a of the torque support 21 is assembled, that is to say, is configured to be assembled, with the housing 17, in particular in the assembled configuration of the electromechanical actuator 11. Furthermore, the second part 21b of the torque support 21 is configured to be assembled, that is to say, is assembled, with the retaining device 9, 23, in particular in an assembled configuration of the electromechanical actuator 11 in the concealing device 3.

[0181] In one embodiment, the second part 21b of the torque support 21 is assembled, or rather configured to be assembled, onto the first part 21a of the torque support 21, in particular in the assembled configuration of the electromechanical actuator 11. In this case, the second part 21b of the torque support 21 is assembled onto the first part 21a of the torque support 21 by means of assembly elements.

[0182] Thus, the torque support 21 consists of at least two separate parts, each forming respectively the first and second parts 21a, 21b of the torque support 21.

[0183] In this way, the second part 21b of the torque support 21 can be interchangeable with the first part 21a of the torque support 21, in particular depending on the shape and type of the retaining elements, not shown, of the retaining device 9, 23.

[0184] In another embodiment, the torque support 21 can be made of a single piece forming the first and second parts 21a, 21b of the torque support 21.

[0185] Advantageously, the second part 21b of the couple support 21 can have different external shapes, including a fluted shape, known as "star-shaped", i.e., having raised features on its outline, or a round shape, i.e., without raised features on its outline, as illustrated in figures 3 And 4 .

[0186] Advantageously, at least a portion of the first part 21a of the torque support 21 is generally cylindrical in shape and is disposed, or rather configured to be disposed, inside the housing 17, particularly in the assembled configuration of the electromechanical actuator 11.

[0187] Advantageously, an outside diameter of at least a portion of the second part 21b of the torque support 21 is greater than an outside diameter Ø17 of the housing 17.

[0188] Advantageously, the torque support 21 further includes a stop, not shown. Moreover, the stop is supported, that is to say, is configured to bear against the housing 17, at the first end 17a of the housing 17, particularly in the assembled configuration of the electromechanical actuator 11.

[0189] Thus, the stop of the torque support 21 allows the sinking of the first part 21a of the torque support 21 into the housing 17 to be limited, along the direction of the axis of rotation X.

[0190] Here, the stop of the torque support 21 includes a shoulder. More specifically, it is made in the form of a collar, in particular cylindrical in shape and with a straight generatrix.

[0191] Here and as illustrated in the figure 4 , the ring 24 is disposed or inserted, in other words is configured to be disposed or inserted, around the torque support 21, in particular the second part 21b of the torque support 21, especially in the assembled configuration of the electromechanical actuator 11. In this case, the ring 24 is mounted freely to rotate around the torque support 21, in particular the second part 21b of the torque support 21.

[0192] Alternatively, not shown, the ring 24 is disposed or inserted, in other words is configured to be disposed or inserted, around a part of the housing 17, in particular in the assembled configuration of the electromechanical actuator 11. In this case, the ring 24 is mounted freely to rotate around the housing 17.

[0193] In another variant, not shown, the ring 24 is disposed or inserted, in other words is configured to be disposed or inserted, on the one hand, around the torque support 21 and, on the other hand, around a part of the housing 17 of the electromechanical actuator 11, in particular the first end 17a of the housing 17, especially in the assembled configuration of the electromechanical actuator 11. In such a case, the ring 24 can be mounted freely in rotation, on the one hand, around the torque support 21 and, on the other hand, around the housing 17 of the electromechanical actuator 11.

[0194] Advantageously, the torque support 21 further includes a cover 22. The cover 22 is mounted, or rather configured to be mounted, on the torque support 21, in particular on the first and / or second parts 21a, 21b of the torque support 21, especially in the assembled configuration of the electromechanical actuator 11.

[0195] Advantageously, the control unit 15 is disposed at least partly inside the housing 17 of the electromechanical actuator 11.

[0196] Furthermore, the control unit 15 can be disposed at least partly outside the housing 17 of the electromechanical actuator 11 and, in particular, mounted in the torque support 21 or in one of the supports 23.

[0197] Advantageously, the control unit 15 comprises a first electronic board 15a and a second electronic board 15b, as illustrated in the figure 4 .

[0198] Here, the first electronic board 15a of the control unit 15 is arranged inside the housing 17 of the electromechanical actuator 11, particularly in the assembled configuration of the electromechanical actuator 11. In addition, the second electronic board 15b is arranged inside the torque support 21 of the electromechanical actuator 11, particularly in the assembled configuration of the electromechanical actuator 11.

[0199] Advantageously, the first electronic board 15a is configured to control the electric motor 16. In addition, the second electronic board 15b is configured to, among other things, access parameterization and / or configuration functions of the electromechanical actuator 11, by means of selection devices 61, only one of which is shown in the figures 3 And 4 , and, possibly, display, not shown.

[0200] Here, the control unit 15, in particular each of the first and second electronic boards 15a, 15b, is supplied with electrical energy by means of the power supply cable 18.

[0201] Advantageously, the torque support 21 includes, or integrates, at least one selection device 61, in particular a button, which may be, for example, of the push-button or magnetic type. Furthermore, the selection device or devices 61 are configured, in particular, to adjust the electromechanical actuator 11 through one or more configuration modes, to pair one or more control units 12, 13 with the electromechanical actuator 11, to reset one or more parameters, which may be, for example, a limit switch position, to reset the paired control unit(s) 12, 13, or to control the movement of the screen 2.

[0202] Advantageously, the torque support 21 includes, or rather integrates, at least one display device, not shown. Furthermore, the display device(s) is configured, in particular, to display a visual indication, which may, for example, represent an operating mode of the electromechanical actuator 11, in particular a configuration mode or a control mode, or a state of a component of the motorized drive device 5.

[0203] Advantageously, the electromechanical actuator 11 further includes a torque transmission device 31.

[0204] Here, the torque transmission device 31 comprises a single-piece component 32, which can also be called a cardan joint, and a coupling element 62.

[0205] The torque transmission device 31 is housed, in other words mounted, inside the housing 17 of the electromechanical actuator 11, in particular in the assembled configuration of the electromechanical actuator 11.

[0206] Here, the input shaft 43 of the reducer 19 is coupled, or rather configured to be coupled, with the rotor 16a of the electric motor 16 via the torque transmission device 31, in particular in the assembled configuration of the electromechanical actuator 11.

[0207] Advantageously, the monobloc organ 32 includes a first housing 54. The first housing 54 receives, in other words is configured to receive or to house, a part of the shaft 53 of the rotor 16a of the electric motor 16, in particular in the assembled configuration of the electromechanical actuator 11.

[0208] Here, the part of the shaft 53 of the rotor 16a of the electric motor 16 is in direct contact with the first housing 54 of the monobloc component 32.

[0209] Alternatively, and not shown, the torque transmission device 31 further comprises an adapter. The adapter is mounted, or configured to be mounted, on a portion of the shaft 53 of the rotor 16a of the electric motor 16, particularly in the assembled configuration of the electromechanical actuator 11. Mounting can be achieved, for example, by press-fitting the adapter onto the portion of the shaft 53 of the rotor 16a. In this case, the first housing 54 receives, or is configured to receive or house, the portion of the shaft 53 of the rotor 16a of the electric motor 16 via the adapter, particularly in the assembled configuration of the electromechanical actuator 11. Thus, the portion of the shaft 53 of the rotor 16a of the electric motor 16 is in contact with the first housing 54 of the monobloc component 32 through the adapter.

[0210] Advantageously, the first housing 54 of the monobloc component 32 has a first shape, in particular a cross shape. The portion of the shaft 53 of the rotor 16a has a second shape, in particular a flat shape, such as, for example, the free end of a flathead screwdriver. Furthermore, the second shape of the portion of the shaft 53 of the rotor 16a is configured to be inserted, that is, is inserted, into the first shape of the first housing 54 of the monobloc component 32, in particular in the assembled configuration of the electromechanical actuator 11.

[0211] Alternatively, not shown, the first form of the first housing 54 of the monobloc organ 32 is slot-shaped.

[0212] In another variant, not shown, the first form of the first housing 54 of the monobloc component 32 includes holes, which may, for example, be two in number. Furthermore, the second form of the shaft portion 53 of the rotor 16a includes pins, such as those in the shape of a fork, which may, for example, be two in number.

[0213] In another variant, not shown, the first shape of the first housing 54 of the monobloc component 32 is a star shape or internal toothed shape. Furthermore, the second shape of the shaft portion 53 of the rotor 16a is a star shape or external toothed shape.

[0214] Advantageously, the monobloc organ 32 includes a second housing 55. The second housing 55 receives, in other words is configured to receive or to house, a part of the solar pinion 40 of the first reduction stage 37, in particular in the assembled configuration of the electromechanical actuator 11.

[0215] Advantageously, the coupling element 62 is assembled, or rather configured to be assembled, inside the second housing 55 of the monobloc organ 32, particularly in an assembled configuration of the torque transmission device 31.

[0216] Thus, the coupling element 62 allows the torque supplied by the electric motor 16 to be transmitted from the monobloc component 32 to the reducer 19, in particular to the first reduction stage 37.

[0217] Advantageously, the solar pinion 40 of the first reduction stage 37 includes the shaft 59. In addition, the coupling element 62 is assembled on the shaft 59 of the solar pinion 40.

[0218] Here, the monobloc organ 32 and the coupling element 62 are two separate parts which are assembled together, so as to be fixed together.

[0219] Thus, the torque transmission device 31 is a sub-assembly consisting of the monobloc body 32 and the coupling element 62, so as to transmit a torque between the rotor 16a of the electric motor 16 and the input shaft 43 of the reducer 19, in particular during the electrical activation of the electric motor 16 causing the rotation of the rotor 16a.

[0220] Advantageously, the assembly of the coupling element 62 inside the second housing 55 of the monobloc member 32 is implemented by fitting the coupling element 62 into the second housing 55 of the monobloc member 32.

[0221] Alternatively, the assembly of the coupling element 62 inside the second housing 55 of the monobloc member 32 is implemented by overmolding the monobloc member 32 around the coupling element 62.

[0222] Advantageously, the coupling element 62 is made of a metallic material, which can be, for example, sintered steel.

[0223] Advantageously, the coupling element 62 includes an orifice 60. In addition, the orifice 60 of the coupling element 62 receives, in other words is configured to receive or to house, the shaft 59 of the solar pinion 40 of the first reduction stage 37, particularly in the assembled configuration of the electromechanical actuator 11.

[0224] Thus, the second housing 55 of the monobloc organ 32 receives, in other words is configured to receive or to house, the shaft 59 of the solar pinion 40 of the first reduction stage 37 via the coupling element 62, in particular in the assembled configuration of the electromechanical actuator 11.

[0225] In this way, the shaft 59 of the solar pinion 40 of the first reduction stage 37 is in contact with the second housing 55 of the monobloc organ 32 through the coupling element 62.

[0226] Advantageously, the assembly of the coupling element 62 on the shaft 59 of the solar pinion 40 of the first reduction stage 37 is implemented by press fitting.

[0227] Here and in no way limiting, the coupling element 62 is press-fitted inside the second housing 55 of the monobloc organ 32 and is then press-fitted onto the shaft 59 of the solar pinion 40 of the first reduction stage 37.

[0228] In an alternative, not shown, the torque transmission device 31 is devoid of the coupling element 62. Thus, the shaft 59 of the solar pinion 40 of the first reduction stage 37 is in direct contact with the second housing 55 of the monobloc member 32. In this case, the shaft 59 of the solar pinion 40 of the first reduction stage 37 has a shape, in particular non-circular, compatible with the shape of the second housing 55 of the monobloc member 32.

[0229] We now describe, with reference to figures 6 à 9 , the spring brake 25 of the electromechanical actuator 11, illustrated in figures 3 à 5 , as well as the assembly of the spring brake 25 with the reducer 19.

[0230] The spring brake 25 includes at least one helical spring 48, a drum 49, an input member 50, an output member 51 and, optionally, a hood 52.

[0231] Advantageously, the input organ 50 is driven, or rather configured to be driven, in rotation by the electric motor 16.

[0232] Advantageously, the drum 49 and the first crown 65 of the first stage of reduction 37 are two separate parts.

[0233] As an alternative, not shown, the drum 49 and the first crown 65 of the first reduction stage 37 are made using a single piece.

[0234] Advantageously, the drum 49 includes a housing 56.

[0235] Here, the housing 56 of the drum 49 is cylindrical in shape. Furthermore, the housing 56 of the drum 49 is open at both its axial ends.

[0236] Advantageously, the helical spring 48, the input member 50, the output member 51 and, possibly, the hood 52 are arranged, or rather configured to be arranged, at least in part inside the housing 56 of the drum 49, especially in an assembled configuration of the spring brake 25.

[0237] Here, the output member 51 is arranged opposite the input member 50.

[0238] Here, the helical spring 48 has a plurality of turns.

[0239] The coils of the helical spring 48 are centered on an axis coinciding with the axis of rotation X, when the spring brake 25 is assembled and then mounted in the electromechanical actuator 11. Similarly, the input member 24 and the output member 25 are centered on an axis coinciding with the axis of rotation X, when the spring brake 25 is assembled and then mounted in the electromechanical actuator 11.

[0240] The axis of each of the components 48, 49, 50, 51, 52 of the spring brake 25 is not shown on the figures 6 à 9 , so as to simplify their reading.

[0241] Here, the drum 49 includes a friction surface 57. The friction surface 57 cooperates, in other words is configured to cooperate, with at least one turn of the helical spring 48, in particular in the assembled configuration of the spring brake 25.

[0242] Advantageously, the friction surface 57 is an internal surface of the drum 49 delimiting, in other words which delimits, radially the housing 56, in this case on the outside.

[0243] Thus, at least one turn of the helical spring 48 is radially constrained by the housing 56 of the drum 49.

[0244] Here, the helical spring 48 is mounted tightly inside the housing 56 of the drum 49, so as to secure the helical spring 48 and the drum 49 by friction, when the helical spring 48 is at rest.

[0245] Advantageously, the helical spring 48 is formed from a wire 58. The helical spring 48 has close-wound coils, in a rest state of the spring brake 25.

[0246] One end of the helical spring 48 forms a first leg 48a. A second end of the helical spring 48 forms a second leg 48b.

[0247] Thus, the helical spring 48 has two legs 48a, 48b. Only the first leg 48a is visible at the figure 6 and the first and second legs 48a, 48b are visible at the figure 8 .

[0248] Advantageously, each of the first and second legs 48a, 48b extends radially with respect to the axis of rotation X and, in particular, towards the interior of the helical spring 48.

[0249] In this embodiment, the first and second legs 48a, 48b of the helical spring 48 extend radially with respect to the axis of rotation X and inwards along the helical spring 48, specifically from the coils of the helical spring 48 towards the central axis of the helical spring 48, as illustrated in the figure 8 .

[0250] Alternatively, not shown, each of the first and second legs 48a, 48b of the helical spring 48 extends axially with respect to the axis of rotation X, particularly in the assembled configuration of the spring brake 25.

[0251] Advantageously, the input member 50 includes a drive tooth 68.

[0252] Advantageously, the drive tooth 68 extends, in other words is configured to extend, in a direction parallel to the axis of rotation X, between the input member 50 and the hood 52, particularly in the assembled configuration of the spring brake 25.

[0253] Advantageously, the drive tooth 68 of the input member 50 is inserted, or rather configured to be inserted, inside the helical spring 48, particularly in the assembled configuration of the spring brake 25.

[0254] Advantageously, the input member 50, in particular the drive tooth 68 of the input member 50, cooperates, in other words is configured to cooperate, with at least one of the first and second legs 48a, 48b of the helical spring 48, in particular in the assembled configuration of the spring brake 25, so as to drive the helical spring 48 in rotation around the axis of rotation X in a first direction of rotation.

[0255] Such a movement releases the spring brake 25 and, more specifically, the helical spring 48 from the drum 49.

[0256] The frictional effort between at least one turn of the helical spring 48 and the friction surface 57 of the drum 49 is reduced when the helical spring 48 is driven into rotation in the first direction of rotation.

[0257] In other words, this movement tends to decrease the diameter of the outer envelope of the helical spring 48 and therefore to decrease the radial stress between the helical spring 48 and the friction surface 57 of the drum 49.

[0258] Thus, the movement generated by the electric motor 16 can be transmitted from the input member 50 to the output member 51.

[0259] The outer envelope of the helical spring 48 is defined by the outer generatrices of the turns of the helical spring 48.

[0260] Advantageously, the output organ 51 includes at least one ear 69a, 69b.

[0261] Here, the output organ 51 comprises a first ear 69a and a second ear 69b, as illustrated in figures 6 And 8 .

[0262] Advantageously, each of the first and second ears 69a, 69b of the output organ 51 includes a recess 70. Only the recess 70 of the first ear 69a is visible at the figure 6 .

[0263] Here, the recess 70 of the or each of the first and second ears 69a, 69b of the output organ 51 cooperates, in other words is configured to cooperate, with one of the first and second legs 48a, 48b of the helical spring 48, in particular in the assembled configuration of the spring brake 25.

[0264] Advantageously, the first and second ears 69a, 69b of the output member 51 are arranged symmetrically with respect to the axis of rotation X, so as to ensure a balancing of the spring brake 25, during a rotational movement of the input member 50 with respect to the output member 51 around the axis of rotation X.

[0265] Advantageously, the first and second ears 69a, 69b of the output member 51 are inserted, or configured to be inserted, inside the helical spring 48, particularly in the assembled configuration of the spring brake 25.

[0266] Advantageously, the output member 51, in particular one of the first and second ears 69a, 69b, cooperates, or is configured to cooperate, with at least one of the first and second legs 48a, 48b of the helical spring 48, particularly in the assembled configuration of the spring brake 25, so as to drive the helical spring 48 in rotation about the axis of rotation X in a second direction of rotation. The second direction of rotation is opposite to the first direction of rotation.

[0267] Such a movement activates the spring brake 25, that is to say, it tends to block or brake the rotation of the helical spring 48 inside the housing 56 of the drum 49.

[0268] The frictional effort between at least one turn of the helical spring 48 and the friction surface 57 of the drum 49 is increased when the helical spring 48 is driven in the second direction of rotation.

[0269] In other words, this movement tends to increase the diameter of the outer envelope of the helical spring 48, in particular by bringing the first and second legs 48a, 48b of the helical spring 48 closer together, and therefore to increase the radial stress between the helical spring 48 and the friction surface 57 of the drum 49.

[0270] Advantageously, the spring brake 25 includes a lubricant, not shown, disposed between the helical spring 48 and the friction surface 57 of the drum 49. The lubricant is, preferably, grease.

[0271] Advantageously, in the assembled configuration of the spring brake 25, the first leg 48a of the helical spring 48 cooperates, or is configured to cooperate, with a first face 68a of the drive tooth 68 of the input member 50 and the second leg 48b of the helical spring 48 cooperates, or is configured to cooperate, with a second face 68b of the drive tooth 68 of the input member 50. The second face 68b of the drive tooth 68 is opposite to the first face 68a of the drive tooth 68.

[0272] Thus, the drive tooth 68 of the input member 50 is disposed between the first and second legs 48a, 48b of the helical spring 48 and cooperates, in other words is configured to cooperate, with one or the other of the legs 48a of the helical spring 48, according to the direction of rotational drive generated by the electric motor 16.

[0273] In this way, the first and second faces 68a, 68b of the drive tooth 68 constitute two drive faces of the helical spring 48. Each drive face 68a, 68b of the drive tooth 68 cooperates, in other words is configured to cooperate, with one of the first and second legs 48a, 48b of the helical spring 48, in particular in the assembled configuration of the spring brake 25.

[0274] Here, the recess 70 of the first ear 69a of the output member 51 cooperates, or is configured to cooperate, with the first leg 48a of the helical spring 48, particularly in the assembled configuration of the spring brake 25. Furthermore, the recess 70 of the second ear 69b of the output member 51 cooperates, or is configured to cooperate, with the second leg 48b of the helical spring 48, particularly in the assembled configuration of the spring brake 25.

[0275] The electromechanical actuator 11 further includes a centering shaft 71. The input member 50 includes a first bore 72. The output member 51 includes a first bore 73 and a second bore 74. The solar pinion 40 of the second reduction stage 38 includes a bore 75.

[0276] The centering shaft 71 is mounted, in other words configured to be inserted or housed, inside the first bore 73 of the output member 51 and the bore 75 of the solar pinion 40, particularly in the assembled configuration of the electromechanical actuator 11.

[0277] Advantageously, the centering shaft 71 is mounted, in other words configured to be inserted or housed, with a free fit inside the first bore 73 of the output member 51, especially in the assembled configuration of the electromechanical actuator 11.

[0278] The spring brake 25 further includes a bearing 76. The bearing 76 includes a bore 77. The centering shaft 71 is mounted, that is to say, is configured to be inserted or housed, inside the bore 77 of the bearing 76, particularly in the assembled configuration of the electromechanical actuator 11. The bearing 76 is mounted, that is to say, is configured to be inserted or housed, inside the first bore 72 of the input member 50 with an interference fit, particularly in the assembled configuration of the spring brake 25. Furthermore, the bearing 76 is mounted, that is to say, is configured to be inserted or housed, inside the second bore 74 of the output member 51 with a loose fit.

[0279] The term "free fit" means that the assembly of two parts, one comprising a bore and the other being or comprising a shaft, has a clearance. In other words, the fit is positive, such that a radial clearance exists between the bore and the shaft; that is, the shaft has a dimension smaller than that of the bore.

[0280] The term "interference fit" refers to the assembly of two parts, one comprising a bore and the other being or comprising a shaft, with interference. In other words, the fit is negative, such that there is an interference fit between the bore and the shaft; that is, the shaft has a dimension greater than or equal to that of the bore.

[0281] Thus, this construction of the electromechanical actuator 11, where the spring brake 25 is equipped with the bearing 76 mounted inside the first bore 72 of the input member 50 and inside the second bore 74 of the output member 51, allows, when assembling the reducer 19 with the spring brake 25, the output member 51 to be centered relative to the input member 50 inside the spring brake 25, even when the centering shaft 71 is not inserted into the first bore 72 of the input member 50, into the bore 77 of the bearing 76, into the first bore 73 of the output member 51 and into the bore 75 of the solar pinion 40 of the second reduction stage 38.

[0282] In addition, the bearing 76 ensures precise centering of the centering shaft 71 inside the spring brake 25 and the second reduction stage 38, arranged between the spring brake 25 and the output shaft 20, in particular of the second and third reduction stages 38, 39, arranged between the spring brake 25 and the output shaft 20.

[0283] Furthermore, in the assembled configuration of the spring brake 25, the centering shaft 71 is mounted, in other words is configured to be inserted or housed, in the first and second bores 73, 74 of the output member 51, in the bore 77 of the bearing 76, in the first bore 72 of the input member 50.

[0284] Here, the centering shaft 71 is centered with respect to the rotation axis X, particularly in the assembled configuration of the electromechanical actuator 11.

[0285] Advantageously, the 76 bearing is made of bronze.

[0286] The material of the bearing is not limited and can be different. It can be, for example, sintered steel or a plastic material, such as polyacetal, also called POM, or polytetrafluoroethylene, also called PTFE.

[0287] Advantageously, the planet carrier 66 of the second reduction stage 38 includes a bore 78. The solar pinion 40 of the third reduction stage 39 also includes a bore 75. The planet carrier 66 of the third reduction stage 39 also includes a bore 78. In addition, the centering shaft 71 is mounted, that is to say, is configured to be inserted or housed, inside the bore 78 of the planet carrier 66 of the second reduction stage 38, the bore 75 of the solar pinion 40 of the third reduction stage 39, and the bore 78 of the planet carrier 66 of the third reduction stage 39, particularly in the assembled configuration of the electromechanical actuator 11.

[0288] Advantageously, the input member 50 further includes a second bore 79. In addition, the centering shaft 71 is mounted, that is to say, is configured to be inserted or housed, with a free fit inside the second bore 79 of the input member 50, particularly in the assembled configuration of the electromechanical actuator 11.

[0289] Advantageously, the input member 50 includes a coupling interface 88. The planet carrier 66 of the first reduction stage 37 includes a coupling interface 89, which is in this case identical to that of the planet carrier 66 of the second reduction stage 38. In addition, the coupling interface 89 of the planet carrier 66 of the first reduction stage 37 cooperates, in other words is configured to cooperate, with the coupling interface 88 of the input member 50, in particular in the assembled configuration of the electromechanical actuator 11.

[0290] Here, the coupling interface 89 of the planet carrier 66 of the first reduction stage 37 has internal teeth. The coupling interface 88 of the input member 50 has external teeth. Furthermore, the coupling interface 89 of the planet carrier 66 of the first reduction stage 37 meshes, or is configured to mesh, with the coupling interface 88 of the input member 50, particularly in the assembled configuration of the electromechanical actuator 11.

[0291] Thus, the coupling interface 89 of the planet carrier 66 of the first reduction stage 37 allows to receive and transmit a torque from the electric motor 16 and, in this case, from the first reduction stage 37 to the spring brake 25.

[0292] Advantageously, the centering shaft 71 is mounted, that is to say, configured to be inserted or housed, with a tight fit inside the bore 78 of the planet carrier 66 of the third reduction stage 39, particularly in the assembled configuration of the electromechanical actuator 11.

[0293] Alternatively, and not shown, the centering shaft 71 is mounted, that is, configured to be inserted or housed, inside the bore 78 of the planet carrier 66 of the third reduction stage 39 by means of another bearing, particularly in the assembled configuration of the electromechanical actuator 11. In this case, the other bearing also has a bore. The centering shaft 71 is mounted, that is, configured to be inserted or housed, inside the bore of the other bearing, particularly in the assembled configuration of the electromechanical actuator 11. Furthermore, the other bearing is mounted, that is, configured to be inserted or housed, inside the bore 78 of the planet carrier 66 of the third reduction stage 39 with an interference fit, particularly in the assembled configuration of the electromechanical actuator 11.

[0294] Advantageously, the centering shaft 71 is mounted, in other words is configured to be inserted or housed, with a free fit inside the bore 75 of the solar pinion 40 of the second reduction stage 38, as well as of the third reduction stage 39, particularly in the assembled configuration of the electromechanical actuator 11.

[0295] Advantageously, the output member 51 includes a second coupling interface 80. In addition, the second coupling interface 80 of the output member 51 cooperates, or is configured to cooperate, with the solar pinion 40 of the second reduction stage 38, particularly in the assembled configuration of the electromechanical actuator 11.

[0296] Here, the second coupling interface 80 of the output member 51 is an internal tooth. Furthermore, the second coupling interface 80 of the output member 51 meshes, or is configured to mesh, with the solar pinion 40 of the second reduction stage 38, in particular with the first tooth 42 of the solar pinion 40 of the second reduction stage 38, especially in the assembled configuration of the electromechanical actuator 11.

[0297] Thus, the second coupling interface 80 of the output member 51 allows to receive a torque from the electric motor 16 and, in this case, from the spring brake 25, and to transmit it to the second reduction stage 38.

[0298] Advantageously, the coupling interface 89 of the planet carrier 66 of the first reduction stage 37 and of the second reduction stage 38, the coupling interface 88 of the input member 50 and the coupling interface 80 of the output member 51 are respectively centered with respect to the axis of rotation X, in particular in the assembled configuration of the electromechanical actuator 11.

[0299] Advantageously, the coupling interface 89 of the planet carrier 66 of the second reduction stage 38, the coupling interface 80 of the output member 51, and optionally, the coupling interface 89 of the planet carrier 66 of the first reduction stage 37 are identical, in this case, they have the same internal teeth. Furthermore, the first teeth 42 of the sun pinion 40 of the second reduction stage 38 and the first teeth 42 of the sun pinion 40 of the third reduction stage 39, and optionally, the coupling interface 88 of the input member 50, in this case, the teeth constituting it, are identical.

[0300] Advantageously, the hood 52 includes an opening 81. Furthermore, the opening 81 of the hood 52 is through-hole. The opening 81 of the hood 52 cooperates, or is configured to cooperate, with the coupling interface 80 of the output member 51, particularly in the assembled configuration of the spring brake 25.

[0301] Thus, the coupling interface 80 of the output member 51 is inserted into the opening 81 of the hood 52, so as to extend on both sides of the hood 52, in particular in the assembled configuration of the spring brake 25.

[0302] Advantageously, the input element 50 includes a first tray 82. In addition, the hood 52 includes a second tray 83.

[0303] Advantageously, in the assembled configuration of the spring brake 25, the first leg 48a of the helical spring 48 extends along the first plate 82 of the input member 50 and the second leg 48b of the helical spring 48 extends along the second plate 83 of the hood 52.

[0304] Here, the first chainring 82 is integral with the drive tooth 68, preferably monobloc with it.

[0305] Here and as illustrated in figures 7 And 9, the helical spring 48 and the output member 51 are held in axial position between the first plate 82 of the input member 50 and the second plate 83 of the hood 52.

[0306] Advantageously, the input member 50 and, more particularly, the first plate 82 includes a spacer 84. The spacer 84 is configured to extend, in other words, extends, in a direction parallel to the axis of rotation X, between the input member 50 and the hood 52, particularly in the assembled configuration of the spring brake 25.

[0307] Thus, the spacer 84 of the input member 50 makes it possible to maintain an axial distance between the input member 50 and the hood 52 and, more particularly, between the first and second plates 82, 83.

[0308] Here, the spacer 84 of the input member 50 is arranged diametrically opposite the drive tooth 68 of the input member 50, as illustrated in figures 6 à 9 .

[0309] Furthermore, in this embodiment example, the drive tooth 68 of the input member 50 forms another spacer.

[0310] Thus, the drive tooth 68 of the input member 50 also makes it possible to maintain the axial spacing between the input member 50 and the hood 52 and, more particularly, between the first and second plates 82, 83.

[0311] In an alternative, not shown, the hood 52 and, more particularly, the second plate 83 includes the spacer 84. The spacer 84 then also extends between the input member 50 and the hood 52, particularly in the assembled configuration of the spring brake 25. In this case, the spacer 84 of the hood 52 can be arranged diametrically opposite to the drive tooth 68 of the input member 50, with respect to the axis of rotation X, particularly in the assembled configuration of the spring brake 25.

[0312] Here, the drive tooth 68 and the spacer 84 make it possible to make the spring brake 25, in particular the input member 50, symmetrically with respect to the axis of rotation X, so as to guarantee a balancing of the spring brake 25, during a rotational movement of the input member 50 with respect to the output member 51 around the axis of rotation X.

[0313] Here and as illustrated in figures 6 , 7 And 9 The first and second plates 82, 83 each include a peripheral collar 82a, 83a. The two peripheral collars 82a, 83a are arranged opposite each other along the axis of rotation X, in particular in the assembled configuration of the spring brake 25.

[0314] Advantageously, the input member 50 is centered, in other words is configured to be centered, relative to the housing 56 of the drum 49, along the direction of the axis of rotation X, by means of the peripheral collar 82a of the second plate 82 and the friction surface 57 of the drum 49, in particular in the assembled configuration of the spring brake 25.

[0315] Advantageously, a first centering zone of the input member 50 relative to the housing 56 of the drum 49 and a second positioning zone of the bearing 76 inside the spring brake 25 are arranged at least partially overlapping along the axis of rotation X. In other words, the first centering zone and the second positioning zone are at least partially opposite each other in a direction orthogonal to the axis of rotation X.

[0316] Thus, an overlap, along the axis of rotation X, between the first centering zone and the second positioning zone makes it possible to limit an operating noise of the spring brake 25.

[0317] In this way, radial forces generated by the solar pinion 40 and the satellite pinions 63 of the first reduction stage 37 and, more particularly, of each of the first and second reduction stages 37, 38 are transmitted to the drum 49 via the input member 50, so as to limit an operating noise of the spring brake 25.

[0318] Advantageously, in the assembled configuration of the spring brake 25, the first leg 48a of the helical spring 48 is disposed between the first face 68a of the drive tooth 68 of the input member 50 and the spacer 84. In addition, the second leg 48b of the helical spring 48 is disposed between the second face 68b of the drive tooth 68 of the input member 50 and the spacer 84.

[0319] Advantageously, the input member 50 and the hood 52 and, more particularly, the first and second plates 82, 83 are held fixed in rotation around the axis of rotation X, in particular in the assembled configuration of the spring brake 25.

[0320] Here, the inlet element 50 and the hood 52 are fixed to each other by means of fixing elements 85.

[0321] Advantageously, the fixing elements 85 of the input member 50 and of the hood 52 are screw fixing elements, in particular two of them.

[0322] The number of fasteners for the inlet and cover is not limited and may vary, in particular exceeding or equal to three.

[0323] Here, a first fixing element 85 of the input member 50 is disposed at the level of the drive tooth 68 of the input member 50. In addition, a second fixing element 85 of the input member 50 is disposed at the level of the spacer 84 of the input member 50.

[0324] Here, each of the first and second fixing elements 85 is inserted through a notch 86 of the cover 52, in this case of the second plate 83, and then screwed into the inside of a screw shank 87 of the input member 50. In addition, a first screw shank 87 is provided in the drive tooth 68 of the input member 50 and a second screw shank 87 is provided in the spacer 84 of the input member 50.

[0325] In an alternative, not shown, the fixing elements 85 of the input member 50 and the hood 52 are snap-fit ​​fixing elements and, in particular, studs arranged at the level of the drive tooth 68 and the spacer 84 and holes made in the hood 52, in this case in the second plate 83.

[0326] Alternatively, and not shown, the inlet member 50 and the cover 52 can be held together by means of snap-fit ​​or crimped fasteners. These fasteners can include, in particular, snap-fit ​​fasteners or shafts crimped into housings.

[0327] Alternatively, not shown, the fastening elements 85 of the inlet member 50 and the hood 52 may be a combination of the different fastening elements described above.

[0328] Advantageously, the inlet member 50 and the outlet member 51 are made of plastic. In addition, the cover 52 is also made of plastic.

[0329] By way of non-limiting example, the plastic material of the inlet member 50, the outlet member 51 and the hood 52 is polybutylene terephthalate, also called PBT, or polyacetal, also called POM.

[0330] Thus, the use of a plastic material for the inlet member 50, the outlet member 51 and the cover 52 makes it possible to reduce the operating noise of the spring brake 25, in particular generated by friction against the drum 49.

[0331] Alternatively, the output unit 51 can be made of zamac (acronym for the names of the metals that compose it: zinc, aluminum, magnesium and copper).

[0332] Here, drum 49 is made of steel, specifically sintered steel.

[0333] Thus, the use of sintered steel to make the drum 49 reduces the frictional resistance of the helical spring 48 against the friction surface 57 of the drum 49.

[0334] Alternatively, the drum 49 is made of a plastic material, which can be, for example, polyacetal, also called POM, polyamide, also called PA, or polypropylene, also called PP.

[0335] Advantageously, the friction surface 57 of the drum 49 has a diameter Ø57 less than or equal to forty-five millimeters, in particular when the outside diameter 017 of the housing 17 has a value less than or equal to sixty millimeters, preferably less than or equal to twenty-two millimeters and, more particularly, of the order of twenty-one millimeters, in particular when the outside diameter Ø17 of the housing 17 has a value of forty millimeters.

[0336] Thus, the drum 49 has a volume which is maximized by reducing the diameter Ø57 of its friction surface 57.

[0337] Advantageously, the drum 49 includes a shoulder 90. In addition, the planet carrier 66 of the second reduction stage 38 is configured to be supported, in other words is intended to be supported, particularly depending on manufacturing tolerances, against the shoulder 90 of the drum 49, especially in the assembled configuration of the electromechanical actuator 11.

[0338] Here, the shoulder 90 is a circular bearing surface defined in the vicinity of one end of the drum 49 which is oriented towards the second reduction stage 38, in particular in the assembled configuration of the electromechanical actuator 11.

[0339] Thus, the shoulder 90 allows the planet carrier 66 of the second reduction stage 38 to be radially centered with respect to the drum 49 in a direction orthogonal to the axis of rotation X and to achieve an axial stop of the planet carrier 66 of the second reduction stage 38 with respect to the drum 49 in the direction of the axis of rotation X.

[0340] In this way, the bearing area of ​​the satellite carrier 66 of the second reduction stage 38 against the drum 49 along the direction of the axis of rotation X is limited to a diameter Ø90, in other words to a radial width or a height, of the shoulder 90.

[0341] Therefore, the axial stop of the planet carrier 66 of the second reduction stage 38 relative to the drum 49 made by the shoulder 90 of the drum 49 makes it possible to eliminate the axial forces exerted on the input member 50 and the output member 51.

[0342] Furthermore, when the drum 49 is made of a metallic material, particularly sintered steel, the centering of the planet carrier 66 of the second reduction stage 38 relative to the drum 49 is more precise. The geometry and manufacturing tolerances of metallic parts are more accurate than those of plastic parts produced by injection molding.

[0343] Therefore, improving the centering accuracy of the planet carrier 66 of the second reduction stage 38 compared to the drum 49 reduces the operating noise of the reducer 19, since the planet carrier 66 of the second reduction stage 38 is supported against the shoulder 90 of the drum 49, which has increased accuracy in its geometry, particularly in terms of flatness and roughness.

[0344] Advantageously, a value of the diameter Ø90 of the shoulder 90 is strictly greater than a value of the diameter Ø57 of the friction surface 57 of the drum 49.

[0345] Thus, the housing 56 of the drum 49 opens at the end of the drum 49 where the shoulder 90 is provided and, preferably, at both ends of the housing 56 of the drum 49, that is to say that the housing 56 of the drum 49 is not partially closed by a rim extending towards the axis of rotation X.

[0346] In this way, machining the friction surface 57 of the drum 49 is simpler to implement, to guarantee a desired surface finish for this friction surface 57, while minimizing the cost of obtaining the drum 49.

[0347] As a non-limiting example, the value of the diameter Ø90 of the shoulder 90 is on the order of twenty-five millimeters, in particular when the outside diameter Ø17 of the housing 17 has a value of forty millimeters.

[0348] Advantageously, the shoulder 90 of the drum 49 constitutes an axial stop of the planet carrier 66 of the second reduction stage 38 with respect to the drum 49, in particular along the direction of the axis of rotation X, guaranteeing, in other words so as to guarantee, an operating clearance J, in other words a gap, between the cover 52 and the planet carrier 66 of the second reduction stage 38.

[0349] Thus, this operating clearance J between the hood 52 and the planet carrier 66 of the second reduction stage 38 makes it possible to reduce the operating noise of the reducer 19.

[0350] This positioning of the planet carrier 66 of the second reduction stage 38 relative to the drum 49 by means of the shoulder 90 of the drum 49 also makes it possible to improve the efficiency of the reducer 19.

[0351] Thanks to the present invention, this construction of the electromechanical actuator, where the spring brake is equipped with the bearing mounted inside the first bore of the input member and inside the second bore of the output member, makes it possible, when assembling the reducer with the spring brake, to center the output member relative to the input member inside the spring brake, even when the centering shaft is not inserted in the first bore of the input member, in the bore of the bearing, in the first bore of the output member and in the bore of the solar pinion of the reduction stage of the reducer.

[0352] Numerous modifications can be made to the embodiment examples described above without departing from the scope of the invention as defined by the claims.

[0353] Alternatively, and not shown, the spring brake 25 is configured to be located, i.e., is positioned, in the assembled configuration of the electromechanical actuator 11, between the control unit 15 and the electric motor 16, i.e., at the input of the electric motor 16, or between the gearbox 19 and the output shaft 20 of the electromechanical actuator 11, i.e., at the output of the gearbox 19, or between the electric motor 16 and the gearbox 19, i.e., at the output of the electric motor 16. When the spring brake 25 is located between the electric motor 16 and the gearbox 19, the input shaft 43 of the gearbox 19 is coupled, i.e., is configured to be coupled, to the rotor 16a of the electric motor 16 via the torque transmission device 31 and the spring brake 25, particularly in the assembled configuration. of the electromechanical actuator 11.

[0354] Furthermore, the envisaged embodiments and variants can be combined to generate new embodiments of the invention, without departing from the scope of the invention as defined by the claims.

Claims

1. An electromechanical actuator (11) of a shading device (3), the electromechanical actuator (11) comprising at least: - a casing (17), - an electric motor (16), - a gearbox (19), the gearbox (19) comprising at least one reduction stage (38), the reduction stage (38) comprising a sun gear (40) and a plurality of planet gears (63), the sun gear (40) comprising at least one bore (75), - a spring-applied brake (25), and - a centring shaft (71), the electric motor (16), the gearbox (19) and the spring-applied brake (25) being mounted within the casing (17), the spring-applied brake (25) comprising at least: - a coil spring (48), - a drum (49), the drum (49) comprising a friction surface (57), the friction surface (57) being configured to cooperate with at least one turn of the coil spring (48), - an input member (50), the input member (50) comprising at least a first bore (72), and - an output member (51), the output member (51) comprising a first bore (73), the centring shaft (71) being mounted inside the first bore (73) of the output member (51) and the bore (75) of the sun gear (40), characterized in that the output member (51) comprises at least one second bore (74), in that the spring-applied brake (25) further comprises a bushing (76), the bushing (76) comprising at least one bore (77), the centring shaft (71) being mounted inside the bore (77) of the bushing (76), in that the bushing (76) is mounted inside the first bore (72) of the input member (50) with an interference fit, and in that the bushing (76) is mounted inside the second bore (74) of the output member (51) with a loose fit.

2. The electromechanical actuator (11) of a shading device (3) according to claim 1, characterized in that the drum (49) comprises a housing (56), the housing (56) being cylindrical in shape, in that the friction surface (57) is an internal surface of the drum (49) radially delimiting the housing (56), and in that the friction surface (57) of the drum (49) has a diameter (Ø57) less than or equal to forty-five millimetres.

3. The electromechanical actuator (11) of a shading device (3) according to claim 1 or according to claim 2, characterized in that the reduction stage (38) further comprises a planet carrier (66), the planet carrier (66) comprising at least one bore (78), in that the gearbox (19) further comprises a further reduction stage (39), the further reduction stage (39) comprising a further sun gear (40), a plurality of further planet gears (63) and a further planet carrier (66), the further sun gear (40) comprising at least one bore (75), the further planet carrier (66) comprising at least one bore (78), and in that the centring shaft (71) is mounted inside the bore (78) of the planet carrier (66) of the reduction stage (38), the bore (75) of the further sun gear (40) of the further reduction stage (39) and the bore (78) of the further planet carrier (66) of the further reduction stage (39).

4. The electromechanical actuator (11) of a shading device (3) according to claim 3, characterized in that the input member (50) further comprises a second bore (79), in that the centring shaft (71) is mounted with a loose fit inside the second bore (79) of the input member (50), in that the centring shaft (71) is mounted with an interference fit inside the bore (78) of the further planet carrier (66) of the further reduction stage (39), and in that the centring shaft (71) is mounted with a loose fit inside the first bore (73) of the output member (51).

5. The electromechanical actuator (11) of a shading device (3) according to claim 3 or according to claim 4, characterized in that the planet carrier (66) of the reduction stage (38) comprises a coupling interface (89), in that the output member (51) comprises a coupling interface (80), in that the coupling interface (89) of the planet carrier (66) of the reduction stage (38) and the coupling interface (80) of the output member (51) are identical, in that the sun gear (40) of the reduction stage (38) comprises a first set of teeth (42), in that the further sun gear (40) of the further reduction stage (39) comprises a first set of teeth (42), and in that the first set of teeth (42) of the sun gear (40) of the reduction stage (38) and the first set of teeth (42) of the further sun gear (40) of the further reduction stage (39) are identical.

6. The electromechanical actuator (11) of a shading device (3) according to any one of claims 3 to 5, characterized in that the drum (49) comprises a shoulder (90), and in that the planet carrier (66) of the reduction stage (38) is configured to bear against the shoulder (90) of the drum (49).

7. The electromechanical actuator (11) of a shading device (3) according to claim 6, characterized in that the spring-applied brake (25) further comprises a cover (52), and in that the drum (49) of the shoulder (90) constitutes an axial limit stop of the planet carrier (66) of the reduction stage (38) with respect to the drum (49), ensuring an operating play (J) between the cover (52) and the planet carrier (66) of the reduction stage (38).

8. The electromechanical actuator (11) of a shading device (3) according to any one of claims 1 to 7, characterized in that the drum (49) is made of steel or plastic.

9. The electromechanical actuator (11) of a shading device (3) according to any one of claims 1 to 8, characterized in that the planet carrier (66) of the reduction stage (38) is made of plastic.

10. A shading device (3), the shading device (3) comprising at least: - a screen (2), and - an electromechanical actuator (11), the screen (2) being moved by the electromechanical actuator (11), characterized in that the electromechanical actuator (11) is according to any one of claims 1 to 9.