EP3717728B1 - Electromechanical actuator and home automation installation comprising such an actuator - Google Patents

Description

The present invention relates to an electromechanical actuator. The electromechanical actuator includes a spring brake. This type of spring brake is more particularly suitable for a so-called tubular electromechanical actuator.

The present invention also relates to a home automation system for closing or sun protection comprising a screen that can be rolled up onto a winding tube driven in rotation by such an electromechanical actuator.

In general, the present invention relates to the field of concealment devices comprising a motorized drive device setting a screen in motion, between at least a first position and at least a second position.

A motorized drive device comprises an electromechanical actuator of a movable closing, concealment or sun protection element such as a shutter, a door, a grille, a blind or any other equivalent material, hereinafter called a screen. .

We already know the document FR 2 995 001 A1 which describes an electromechanical actuator for a home automation system for closing or sun protection. The electromechanical actuator consists of an electric motor, a reducer and a spring brake. The spring brake includes a coil spring, a drum, an input member, an output member, and a cover. Each end of the coil spring forms a tab extending radially with respect to an axis of rotation of the spring brake. The drum has a cylindrically shaped housing. Further, an internal friction surface of the drum housing is configured to cooperate with at least one coil of the coil spring. In this way, at least one turn of the helical spring is radially constrained by the housing of the drum.

The input member includes a drive tooth. The drive tooth extends between the input member and the cover, in an assembled configuration of the spring brake. In addition, the inlet member or the cover comprises a spacer. The spacer extends between the input member and the cover, in the assembled configuration of the spring brake.

The output member has two ears.

The input member is rotated by the electric motor. The drive tooth of the input member is configured to cooperate with one of the tabs of the coil spring, so as to rotate the coil spring around the axis of rotation of the spring brake in a first direction of rotation. Such a movement frees the spring brake. The frictional force between the turns of the helical spring and the internal surface of the housing of the drum is reduced when the helical spring is driven in rotation in the first direction of rotation. In other words, this movement tends to reduce the diameter of the outer casing of the coil spring and therefore to reduce the radial stress between the coil spring and the internal surface of the housing of the drum.

One of the lugs of the output member is configured to cooperate with one of the lugs of the coil spring, so as to drive the coil spring in rotation around the axis of rotation of the spring brake in a second direction of rotation. rotation, the second direction of rotation being opposite to the first direction of rotation. Such movement activates the spring brake. The frictional force between the turns of the coil spring and the internal surface of the housing of the drum is increased when the coil spring is driven in rotation in the second direction of rotation. In other words, this movement tends to increase the diameter of the outer casing of the coil spring and therefore to increase the radial stress between the coil spring and the internal surface of the housing of the drum.

However, this electromechanical actuator has the drawback of generating operating noise and manufacturing defects linked to a misalignment of the coil spring with respect to the input member, to the output member and to the cover. This misalignment generates unwanted friction between the elements of the spring brake.

Therefore, to limit unwanted friction, sizing adjustments of the elements of the spring brake are necessary, in particular reducing the dimensions of the drive tooth of the input member, the spacer and the lugs. of the output member, which may generate risks from the point of view of the quality of the spring brake and therefore of the electromechanical actuator.

In addition, during the manufacture of this electromechanical actuator, the helical spring lacks radial retention relative to the input member, the output member and the cover.

Consequently, during the assembly of the assembly formed by the input member, the helical spring, the output member and the cover inside the drum and, more particularly, during an operation of coil spring, the coil spring is positioned at an angle inside the drum housing.

Furthermore, during the assembly of the assembly formed by the input member, the coil spring, the output member and the cover inside the drum housing, the coil spring rubs on the internal surface. the friction of the drum housing and at least partially removes a lubricant deposited on this internal friction surface and on the coil spring.

The object of the present invention is to resolve the aforementioned drawbacks and to propose an electromechanical actuator for a home automation system for closing or sun protection comprising a spring brake, as well as a home automation system for closing or sun protection comprising such an electromechanical actuator. , making it possible to guarantee the radial retention of a helical spring relative to an input member, to an output member and to a cover, during the manufacture of the spring brake and during the operation of the spring brake, as well as to reduce the operating noises of the spring brake when driving in rotation an input member and / or an output member inside a housing of a drum.

• l'actionneur électromécanique comprenant au moins :
  • un moteur électrique,
  • un réducteur, et
  • un frein à ressort,
• le frein à ressort comprenant au moins :
  • un ressort hélicoïdal,
  • un tambour, le tambour comprenant un logement, le logement du tambour comprenant une surface interne de frottement configurée pour coopérer avec au moins une spire du ressort hélicoïdal,
  • un organe d'entrée,
  • un organe de sortie, et
  • un capot,
    • ▪ l'organe d'entrée comprenant une dent d'entraînement, la dent d'entraînement s'étendant entre l'organe d'entrée et le capot, dans une configuration assemblée du frein à ressort, et
    • ▪ l'organe d'entrée ou le capot comprenant une entretoise, l'entretoise s'étendant entre l'organe d'entrée et le capot, dans la configuration assemblée du frein à ressort.

In this regard, the present invention relates, according to a first aspect, to an electromechanical actuator for a home automation system for closing or for solar protection,

• the electromechanical actuator comprising at least:
  • an electric motor,
  • a reducer, and
  • a spring brake,
• the spring brake comprising at least:
  • a coil spring,
  • a drum, the drum comprising a housing, the housing of the drum comprising an internal friction surface configured to cooperate with at least one turn of the helical spring,
  • an input body,
  • an output device, and
  • a cap,
    • ▪ the input member comprising a drive tooth, the drive tooth extending between the input member and the cover, in an assembled configuration of the spring brake, and
    • ▪ the input member or the cover comprising a spacer, the spacer extending between the input member and the cover, in the assembled configuration of the spring brake.

According to the invention, the input member comprises a first radial retaining element of the helical spring extending between the drive tooth and the spacer, according to a first side of the spring brake, in the assembled configuration of the brake on springs. In addition, the cover includes a second radial retaining element for the coil spring extending between the drive tooth and the spacer, on a second side of the spring brake, in the assembled configuration of the spring brake, the second side of the spring brake being opposite to the first side of the spring brake, for example relative to an axis of rotation of the spring brake.

Thus, the first and second radial retaining elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to guarantee the radial retention of the helical spring relative to the member d. '' input, to the output member and to the cover, during the manufacture of the spring brake and during the operation of the spring brake, as well as to reduce the operating noise of the spring brake, during the rotary drive of the input member and / or the output member inside the drum housing.

In this way, the first and second radial retaining elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to avoid manufacturing defects linked to a misalignment of the spring. helical with respect to the input member, to the output member and to the cover.

Consequently, the first and second radial retaining elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to ensure the positioning of the coil spring inside the housing of the. drum, during assembly of the spring brake and, more particularly, during an operation of loading the coil spring.

In addition, during assembly of the spring brake, the first and second radial holding elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to limit friction of the coil spring on the internal friction surface of the drum housing and therefore avoid the removal of at least part of a lubricant deposited on this internal friction surface and on the coil spring.

According to an advantageous characteristic of the invention, the first and second radial holding elements respectively comprise a rib extending partially between the input member and the cover, in the direction of the axis of rotation, in the assembled configuration. spring brake.

According to another advantageous characteristic of the invention, an outer surface of the first radial holding element and an outer surface of the second radial holding element are configured to cooperate with at least one turn of the helical spring.

According to another advantageous characteristic of the invention, the helical spring is formed from a wire. A first end of the coil spring forms a first tab. A second end of the coil spring forms a second tab. Further, each of the first and second legs extends radially with respect to the axis of rotation and inwardly of the coil spring.

According to another advantageous characteristic of the invention, in the assembled configuration of the spring brake, the first leg of the coil spring is configured to cooperate with a first surface of the drive tooth of the input member and the second leg. of the coil spring is configured to cooperate with a second surface of the drive tooth of the input member, the second surface of the drive tooth being opposite the first surface of the drive tooth.

According to another advantageous characteristic of the invention, in the assembled configuration of the spring brake, the first tab of the coil spring is disposed between the first surface of the drive tooth of the input member and the spacer. Further, the second leg of the coil spring is disposed between the second surface of the input member drive tooth and the spacer.

According to another advantageous characteristic of the invention, the input member comprises a first plate. The hood includes a second tray. Further, in the assembled configuration of the spring brake, the first leg of the coil spring extends along the second plate of the cowling and the second leg of the coil spring extends along the first plate of the input member. .

According to another advantageous characteristic of the invention, the input member and the cover are kept integral in rotation about the axis of rotation, in the assembled configuration of the spring brake.

According to another advantageous characteristic of the invention, the input member and the cover are fixed to one another by means of fixing elements. In addition, the fastening elements of the input member and of the cover are elastic snap fasteners arranged at the level of the drive tooth and the spacer.

The present invention relates, according to a second aspect, to a home automation system for closing or for solar protection comprising a screen which can be rolled up on a winding tube driven in rotation by an electromechanical actuator in accordance with the invention.

This home automation installation has characteristics and advantages similar to those described above in relation to the electromechanical actuator according to the invention, as mentioned above.

Other features and advantages of the invention will become apparent in the description below.

• la figure 1 est une vue schématique en coupe transversale d'une installation domotique conforme à un mode de réalisation de l'invention ;
• la figure 2 est une vue schématique en perspective de l'installation domotique illustrée à la figure 1 ;
• la figure 3 est une vue schématique en coupe partielle de l'installation domotique illustrée à la figure 2, au niveau d'un actionneur électromécanique ;
• la figure 4 est une vue schématique éclatée et en perspective d'un frein à ressort de l'actionneur électromécanique illustré à la figure 3 ;
• la figure 5 est une vue schématique en perspective du frein à ressort illustré à la figure 4, où un tambour du frein à ressort a été ôté ;
• la figure 6 est une première vue schématique en coupe du frein à ressort illustré aux figures 4 et 5, avant l'introduction d'un organe d'entrée, d'un organe de sortie et d'un ressort hélicoïdal à l'intérieur du tambour ;
• la figure 7 est une deuxième vue schématique en coupe du frein à ressort illustré aux figures 4 à 6, après l'introduction de l'organe d'entrée, de l'organe de sortie et du ressort hélicoïdal à l'intérieur du tambour, où le tambour du frein à ressort a été ôté ;
• la figure 8 est une vue schématique en perspective de l'organe d'entrée du frein à ressort illustré aux figures 4 à 7 ; et
• la figure 9 est une vue schématique en perspective d'un capot du frein à ressort illustré aux figures 4 à 7.

In the accompanying drawings, given by way of nonlimiting examples:

• the figure 1 is a schematic cross-sectional view of a home automation installation according to one embodiment of the invention;
• the figure 2 is a schematic perspective view of the home automation installation illustrated on figure 1 ;
• the figure 3 is a schematic view in partial section of the home automation system illustrated on figure 2 , at the level of an electromechanical actuator;
• the figure 4 is an exploded and perspective schematic view of a spring brake of the electromechanical actuator shown in figure 3 ;
• the figure 5 is a schematic perspective view of the spring brake shown in figure 4 , where a drum of the spring brake has been removed;
• the figure 6 is a first schematic sectional view of the spring brake illustrated in figures 4 and 5 , before the introduction of an input member, an output member and a coil spring inside the drum;
• the figure 7 is a second schematic sectional view of the spring brake illustrated in figures 4 to 6 , after the introduction of the input member, the output member and the coil spring inside the drum, where the drum of the spring brake has been removed;
• the figure 8 is a schematic perspective view of the input member of the spring brake illustrated in figures 4 to 7 ; and
• the figure 9 is a schematic perspective view of a spring brake cover illustrated in figures 4 to 7 .

We first describe, with reference to figures 1 and 2 , a home automation system according to the invention and installed in a building comprising an opening 1, window or door, equipped with a screen 2 belonging to a concealment device 3, in particular a motorized roller shutter.

The concealment device 3 can be a roller shutter, as illustrated in the figures 1 and 2 , a canvas awning or with adjustable slats, or a rolling gate. The present invention applies to all types of concealment device.

We describe, with reference to figures 1 and 2 , a roller shutter according to one embodiment of the invention.

The screen 2 of the concealment device 3 is wound on a winding tube 4 driven by a motorized drive device 5 and movable between a rolled-up position, in particular high, and an unwound position, in particular low.

The mobile screen 2 of the concealment device 3 is a closing, concealing and / or sun protection screen, winding on the winding tube 4, the internal diameter of which is appreciably greater than the external diameter of a electromechanical actuator 11, so that the electromechanical actuator 11 can be inserted into the winding tube 4, when assembling the concealment device 3.

The motorized drive device 5 comprises the electromechanical actuator 11, in particular of the tubular type, making it possible to set the winding tube 4 in rotation, so as to unwind or wind the screen 2 of the concealment device 3.

The concealment device 3 comprises the winding tube 4 for winding the screen 2. In the mounted state, the electromechanical actuator 11 is inserted into the winding tube 4.

In known manner, the roller shutter, which forms the concealment device 3, comprises an apron comprising horizontal slats articulated to each other, forming the screen 2 of the roller shutter 3, and guided by two lateral slides 6. These slats are contiguous, when the shutter 2 of the roller shutter 3 reaches its lower unrolled position.

In the case of a rolling shutter, the high rolled-up position corresponds to the resting of a final end blade 8, for example L-shaped, of the apron 2 of the rolling shutter 3 against an edge of a box 9 of the roller shutter 3 or when the final end slat 8 is stopped in a programmed upper end-of-travel position. In addition, the lower unrolled position corresponds to the resting of the final end blade 8 of the shutter 2 of the shutter 3 against a threshold 7 of the opening 1 or the stopping of the final end blade 8 in a programmed low limit switch position.

The first blade of the apron 2 of the roller shutter 3, opposite the final end blade 8, is connected to the winding tube 4 by means of at least one articulation 10, in particular a fastening piece in the form of a strip. .

The winding tube 4 is arranged inside the box 9 of the roller shutter 3. The apron 2 of the roller shutter 3 winds up and unwinds around the winding tube 4 and is housed at least partly inside the roller shutter. inside the trunk 9.

In general, the box 9 is placed above the opening 1, or else in the upper part of the opening 1.

The motorized drive device 5 is controlled by a control unit. The control unit can be for example a local control unit 41, where the local control unit 41 can be wired or not wired with a central control unit 42. The central control unit 42 can control the local control unit 41, as well as other units. similar local control units distributed throughout the building.

The central control unit 42 can be in communication with a remote weather station outside the building, including, in particular, one or more sensors which can be configured to determine, for example, a temperature, a luminosity or even a speed of wind.

A remote control 43, which may be a type of local control unit, provided with a control keyboard and which comprises selection and display means, further allows a user to intervene on the electromechanical actuator 11, the local control unit 41 and / or the central control unit 42.

The motorized drive device 5 is preferably configured to execute the commands for unwinding or winding the screen 2 of the concealment device 3, which can be emitted, in particular, by the remote control 43.

We will now describe, in more detail and with reference to figure 3 , the electromechanical actuator 11 belonging to the home automation installation of figures 1 and 2 .

The electromechanical actuator 11 comprises at least one electric motor 12, a reduction gear 14 and a spring brake 15.

The electric motor 12 comprises a rotor and a stator, not shown, positioned coaxially around an 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.

Control means of the electromechanical actuator 11, allowing the displacement of the screen 2 of the concealment device 3, comprise at least one electronic control unit 44. This electronic control unit 44 is able to start the engine. electric 12 of the electromechanical actuator 11 and, in particular, allow the supply of electric energy to the electric motor 12.

Thus, the electronic control unit 44 controls, in particular, the electric motor 12, so as to open or close the screen 2, as described above.

The electronic control unit 44 also comprises a module for receiving commands, in particular radioelectric commands transmitted by a command transmitter, such as the remote control 43 intended to control the electromechanical actuator 11 or one of the units. local 41 or central 42 control.

The order reception module can also allow order reception transmitted by wire means.

Here, and as illustrated on figure 3 , the electronic control unit 44 is placed inside a casing 13 of the electromechanical actuator 11.

The control means of the electromechanical actuator 11 comprise hardware and / or software means.

By way of non-limiting example, the hardware means can comprise at least one microcontroller.

The electromechanical actuator 11 is supplied with electrical energy by a mains electricity supply network, or alternatively by means of a battery, which can be recharged, for example, by a photovoltaic panel. The electromechanical actuator 11 makes it possible to move the screen 2 of the concealment device 3.

Here, the electromechanical actuator 11 comprises an electric power supply cable 21 enabling it to be supplied with electric power from a mains power supply network.

The casing 13 of the electromechanical actuator 11 is preferably of cylindrical shape.

In one embodiment, the casing 13 is made of a metallic material.

The material of the housing of the electromechanical actuator is not limiting and may be different. It can, in particular, be a plastic material.

The winding tube 4 is driven in rotation around the axis of rotation X and the casing 13 of the electromechanical actuator 11 supported by means of two pivot links. The first pivot connection is produced at a first end of the winding tube 4 by means of a ring 18 inserted around and at one end 13a of the casing 13 of the electromechanical actuator 11. The ring 18 thus makes it possible to produce a step. The second pivot link, not shown on figure 3 , is produced at a second end of the winding tube 4.

The electromechanical actuator 11 comprises a torque support 19. The torque support 19 projects from one end 13a of the housing 13 of the electromechanical actuator 11, in particular the end 13a of the housing 13 receiving the ring 18. The support torque 19 of the electromechanical actuator 11 thus makes it possible to fix the electromechanical actuator 11 on a frame 20, in particular to a cheek of the box 9.

In addition, the torque support 19 of the electromechanical actuator 11 can make it possible to close the end 13a of the housing 13.

Furthermore, the torque support 19 of the electromechanical actuator 11 can make it possible to support the electronic control unit 44. The electronic control unit 44 can be supplied with electrical energy by means of the electrical supply cable 21 electrically connected to the mains electrical supply network, or even to a battery.

Reducer 14 comprises at least one reduction stage. Said at least one reduction stage may be an epicyclic type gear train.

The type and number of reduction stages of the reducer are in no way limiting.

The electromechanical actuator 11 comprises an output shaft 16. One end of the output shaft 16 protrudes with respect to the casing 13 of the electromechanical actuator 11, in particular with respect to an end 13b of the casing 13 opposite to its. end 13a.

The output shaft 16 of the electromechanical actuator 11 is configured to drive in rotation a connecting element 17 connected to the winding tube 4. The connecting element 17 is made in the form of a wheel.

When the electromechanical actuator 11 is put into operation, the electric motor 12 and the reduction gear 14 drive the output shaft 16 in rotation. In addition, the output shaft 16 of the electromechanical actuator 11 rotates the device. winding tube 4 via the connecting element 17. Thus, the winding tube 4 rotates the screen 2 of the concealment device 3, so as to open or close the opening 1.

The electric motor 12, the reducer 14 and the spring brake 15 are mounted inside the housing 13 of the electromechanical actuator 11.

In the embodiment illustrated on figure 3 , the spring brake 15 is arranged between the electric motor 12 and the reduction gear 14, that is to say at the output of the electric motor 12.

In another embodiment, not shown, where the reducer 14 comprises a plurality of reduction stages, the spring brake 15 is disposed between two reduction stages of the reducer 14.

In another embodiment, not shown, the spring brake 15 is arranged at the outlet of the reducer 14.

The electromechanical actuator 11 can also include an end-of-travel and / or obstacle detection device, this detection device possibly being mechanical or electronic.

We will now describe, with reference to figures 4 to 9 , the spring brake 15 of the electromechanical actuator 11, shown in figure 3 and conforms to a mode of realization of the invention.

The spring brake 15 comprises at least a coil spring 22, a drum 23, an input member 24, an output member 25 and a cover 33.

Advantageously, the drum 23 is held in position in the casing 13 of the electromechanical actuator 11, in particular by means of recesses 28 provided on the outer periphery of the drum 23 and configured to cooperate with the tabs, not shown, of a casing. of the reducer 14.

In addition, the housing of the reducer 14 is held in position in the housing 13 of the electromechanical actuator 11.

The drum 23 has a housing 26.

Here, the housing 26 of the drum 23 is cylindrical in shape. In addition, the housing 26 of the drum 23 opens out.

Advantageously, the coil spring 22, the input member 24, the output member 25 and the cover 33 are arranged inside the housing 26 of the drum 23, in an assembled configuration of the spring brake 15.

Here, the output member 25 is arranged opposite the input member 24.

Advantageously, the helical spring 22 comprises a plurality of turns. The turns of the helical spring 22 are centered on an axis coincident with the axis of rotation X, when the spring brake 15 is assembled and then mounted in the electromechanical actuator 11.

Likewise, the input member 24 and the output member 25 are centered on an axis coincident with the axis of rotation X, when the spring brake 15 is assembled and then mounted in the electromechanical actuator 11.

The axis of each of the members 22, 23, 24, 25, 33 of the spring brake 15 is not shown in the figures 4 to 9 , so as to simplify the reading of these.

The housing 26 of the drum 23 comprises an internal friction surface 27 configured to cooperate with at least one turn of the helical spring 22.

Thus, at least one turn of the helical spring 22 is radially constrained by the housing 26 of the drum 23.

Here, the coil spring 22 is mounted tightly inside the housing 26 of the drum 23, so as to join by friction the coil spring 22 and the drum 23, when the coil spring 22 is at rest, as illustrated in figure 7 .

Advantageously, the coil spring 22 is formed from a wire 48. A first end of the coil spring 22 forms a first tab 29a. A second end of the coil spring 22 forms a second tab 29b. In addition, each of the first and second tabs 29a, 29b extend radially with respect to the axis of rotation X and inwardly of the coil spring 22.

Thus, the coil spring 22 has two tabs 29a, 29b, only one of which is visible at the figure 4 .

Here, each tab 29a, 29b of the coil spring 22 extends radially with respect to the axis of rotation X, in the assembled configuration of the spring brake 15.

Alternatively, not shown, each tab 29a, 29b of the coil spring 22 extends axially with respect to the axis of rotation X, in the assembled configuration of the spring brake 15.

In this exemplary embodiment, the tabs 29a, 29b of the coil spring 22 extend radially relative to the axis of rotation X and inwardly of the coil spring 22, in particular from the turns of the coil spring 22 towards the central axis of coil spring 22, as shown in figure 4 .

The input member 24, in particular a drive tooth 31, is configured to cooperate with at least one of the tabs 29a, 29b of the coil spring 22, so as to drive the coil spring 22 in rotation around it. axis of rotation X in a first direction of rotation.

Such a movement releases the spring brake 15.

The frictional force between at least one turn of the coil spring 22 and the internal surface 27 of the housing 26 of the drum 23 is reduced during the rotational drive of the coil spring 22 in the first direction of rotation.

In other words, this movement tends to reduce the diameter of the outer casing of the coil spring 22 and therefore to decrease the radial stress between the coil spring 22 and the internal surface 27 of the housing 26 of the drum 23.

Thus, the movement generated by the electric motor 12 can be transmitted from the input member 24 to the output member 25.

The outer casing of the coil spring 22 is defined by the external generatrices of the turns of the coil spring 22.

Advantageously, the output member 25 comprises two ears 39, as illustrated in figures 4 , 6 and 7 . The ears 39 of the output member 25 are configured to be inserted inside the coil spring 22, in the assembled configuration of the spring brake 15.

Preferably, each lug 39 of the output member 25 comprises a recess 40. The recess 40 of each lug 39 of the output member 25 is configured to cooperate with one of the tabs 29a, 29b of the helical spring 22.

The output member 25, in particular one of the ears 39, is configured to cooperate with at least one of the tabs 29a, 29b of the coil spring 22, so as to drive the coil spring 22 in rotation around the axis of rotation X in a second direction of rotation. The second direction of rotation is opposite to the first direction of rotation.

Such a movement activates the spring brake 15, i.e. tends to block or slow down the rotation of the coil spring 22 inside the housing 26 of the rotating drum 23.

The frictional force between at least one turn of the coil spring 22 and the internal surface 27 of the housing 26 of the drum 23 is increased during the rotational drive of the coil spring 22 in the second direction of rotation.

In other words, this movement tends to increase the diameter of the outer casing of the coil spring 22, in particular by bringing the tabs 29a, 29b of the coil spring 22 closer together, and therefore to increase the radial stress between the coil spring 22 and the surface. internal 27 of housing 26 of drum 23.

Advantageously, the spring brake 15 comprises a lubricant, not shown, disposed between the coil spring 22 and the internal surface 27 of the housing 26 of the drum 23. The lubricant is preferably grease.

Advantageously, the input member 24 is configured to be driven in rotation by the electric motor 12, in an assembled configuration of the electromechanical actuator 11.

Here, and as illustrated in figures 4 and 8 , the input member 24 comprises a housing 50. The housing 50 of the input member 24 is configured to cooperate with a shaft 37 of the output member 25.

Thus, the shaft 37 of the output member 25 makes it possible to receive and transmit a torque coming from the electric motor 12.

In this exemplary embodiment, the shaft 37 of the output member 25 is configured to cooperate with the reduction gear 14.

Thus, the shaft 37 of the output member 25 makes it possible to receive and transmit a torque coming from the electric motor 12 to the reduction gear 14, through the housing 50 of the input member 24 and the shaft. 37 of the output device 25.

The shaft 37 of the output member 25 is centered with respect to the axis of rotation X, in the assembled configuration of the electromechanical actuator 11.

In this exemplary embodiment, the housing 50 of the inlet member 24 is produced by means of a bore, disposed in the center of the inlet member 24 and, more particularly, centered with respect to the axis of rotation X, in the assembled configuration of the spring brake 15. In addition, the output member 25 comprises a pin 51, disposed in alignment with the shaft 37. The pin 51 of the output member 25 is therefore also centered with respect to the axis of rotation X, in the assembled configuration of the spring brake 15.

Thus, the pin 51 of the output member 25 is inserted into the housing 50 of the input member 24.

In this way, the output member 25 is centered relative to the input member 24, by means of the housing 50 of the input member 24 and the pin 51 of the output member 25.

Advantageously, the cover 33 comprises an opening 53. In addition, the opening 53 of the cover 33 is through. The opening 53 of the cover 33 is configured to cooperate with the shaft 37 of the output member 25.

Thus, the shaft 37 of the output member 25 is inserted into the opening 53 of the cover 33, so as to extend on either side of the cover 33, in the assembled configuration of the spring brake 15.

The input member 24 includes the drive tooth 31, as illustrated in figures 4 and 6 to 8 . The drive tooth 31 extends between the input member 24 and the cover 33, in the assembled configuration of the spring brake 15.

Advantageously, the drive tooth 31 of the input member 24 is inserted inside the coil spring 22, in the assembled configuration of the spring brake 15.

Preferably, the input member 24 comprises a first plate 30. In addition, the cover 33 comprises a second plate 32.

Advantageously, in the assembled configuration of the spring brake 15, the first tab 29a of the coil spring 22 extends along the second plate 32 of the cover 33 and the second tab 29b of the coil spring 22 extends along the first plate 30 of the input device 24.

Here, the first plate 30 includes the drive tooth 31.

Advantageously, in the assembled configuration of the spring brake 15, the first tab 29a of the coil spring 22 is configured to cooperate with a first surface 38a of the drive tooth 31 of the input member 24 and the second tab 29b of the. coil spring 22 is configured to cooperate with a second surface 38b of the drive tooth 31 of the input member 24. The second surface 38b of the drive tooth 31 is opposite the first surface 38a of the tooth d 'training 31.

Thus, the drive tooth 31 of the input member 24 is disposed between the two tabs 29a, 29b of the coil spring 22 and is configured to cooperate with one or the other of the tabs 29a, 29b of the coil spring 22, according to the direction of rotation of the drive generated by the electric motor 12, as illustrated in figures 6 and 7 .

In this way, the drive tooth 31 of the input member 24 comprises two drive faces 38a, 38b. Each drive face 38a, 38b of the drive tooth 31 is configured to cooperate with one of the tabs 29a, 29b of the coil spring 22.

Here, and as illustrated in figures 4 and 5 , the coil spring 22 and the output member 25 are held in position axially between the first plate 30 of the input member 24 and the second plate 32 of the cover 33.

The input member 24 and, more particularly, the first plate 30 comprises a spacer 34. The spacer 34 extends between the input member 24 and the cover 33, in the assembled configuration of the spring brake 15. .

Thus, the spacer 34 of the input member 24 makes it possible to maintain an axial distance between the input member 24 and the cover 33 and, more particularly, between the first and second plates 30, 32.

Here, the spacer 34 of the input member 24 is disposed diametrically opposite the drive tooth 31 of the input member 24, as illustrated in figures 4 and 6 at 8.

Furthermore, in this exemplary embodiment, the drive tooth 31 of the input member 24 corresponds to another spacer.

Thus, the drive tooth 31 of the input member 24 also makes it possible to maintain the axial distance between the input member 24 and the cover 33 and, more particularly, between the first and second plates 30, 32 .

Alternatively, not shown, the cover 33 and, more particularly, the second plate 32 comprises the spacer 34. The spacer 34 extends between the input member 24 and the cover 33, in the assembled configuration of the brake. spring loaded 15.

In such a case, the spacer 34 of the cover 33 may be arranged diametrically opposite the drive tooth 31 of the input member 24, with respect to the axis of rotation X, in the assembled configuration. spring brake 15.

Here and as illustrated in figures 4, 5 , 8 and 9 , the first and second plates 30, 32 each comprise a peripheral flange 35, 36. The two peripheral flanges 35, 36 are arranged vis-à-vis one another along the axis of rotation X, in the assembled configuration of spring brake 15.

The input member 24 comprises a first radial retaining element 54 of the coil spring 22 extending between drive tooth 31 and spacer 34, along a first side C1 of spring brake 15, in the assembled configuration of spring brake 15.

In addition, the cover 33 comprises a second radial retaining element 55 of the coil spring 22 extending between the drive tooth 31 and the spacer 34, according to a second side C2 of the spring brake 15, in the assembled configuration of the spring brake 15.

Here, the second radial retaining element 55 of the cover 33 is visible at the figure 9 .

The second side C2 of the spring brake 15 is opposite, more particularly diametrically opposed, to the first side C1 of the spring brake 15, with respect to the axis of rotation X.

Thus, the first and second radial retaining elements 54, 55 of the input member 24 and of the cover 33 extending respectively between the drive tooth 31 and the spacer 34 make it possible to guarantee the radial retention of the helical spring. 22 relative to the input member 24, to the output member 25 and to the cover 33, during the manufacture of the spring brake 15 and during the operation of the spring brake 15, as well as to reduce the noise of operation of the spring brake 15, during the drive in rotation of the input member 24 and / or the output member 25 inside the housing 26 of the drum 23.

In this way, the first and second radial holding elements 54, 55 of the input member 24 and of the cover 33 extending respectively between the drive tooth 31 and the spacer 34 make it possible to avoid defects in manufacture related to a misalignment of the coil spring 22 relative to the input member 24, the output member 25 and the cover 33.

Consequently, the first and second radial retaining elements 54, 55 of the input member 24 and of the cover 33 extending respectively between the drive tooth 31 and the spacer 34 make it possible to guarantee the positioning of the coil spring. 22 inside the housing 26 of the drum 23, during the assembly of the spring brake 15 and, more particularly, during an operation of loading the coil spring 22.

Here, the first and second radial holding elements 54, 55 of the input member 24 and of the cover 33 are respectively arranged on one side C1, C2 of the spring brake 15 with respect to the axis of rotation X and , more particularly, arranged diametrically opposed with respect to the axis of rotation X.

In addition, when assembling the spring brake 15, the first and second radial holding members 54, 55 of the input member 24 and the cover 33 extending respectively between the drive tooth 31 and the 'spacer 34 make it possible to limit a friction of the coil spring 22 on the internal friction surface 27 of the housing 26 of the drum 23 and consequently to avoid the withdrawal of at least a part of the lubricant deposited on this internal friction surface 27 and on the coil spring 22.

Furthermore, the design of such a spring brake 15 requires taking into consideration an angular displacement α between one of the tabs 29a, 29b of the coil spring 22, in this case the second tab 29b of the coil spring 22, and one of the lugs 39 of the output member 25, in the present case a second lug 39 of the output member 25, so as to allow the operation of the spring brake 15, both during release only when activating the spring brake 15, as shown in figure 7 .

This angular movement α makes it possible to determine the angular dimensioning of the drive tooth 31 of the input member 24, of the spacer 34 and of the lugs 39 of the output member 25.

The first and second radial holding elements 54, 55 respectively of the input member 24 and of the cover 33 make it possible to limit the value of the angular displacement α and, consequently, to optimize the angular dimensioning of the drive tooth. 31 of the input member 24, of the spacer 34 and of the ears 39 of the output member 25, so as to guarantee the robustness of the latter.

By way of non-limiting example, the angular displacement α can be reduced by a value of the order of 8 ° to 10 °.

The design of such a spring brake 15 also requires taking into consideration the outer diameter of the output member 25, so as to limit the operating noises of the spring brake 15, linked to the friction of minus one turn of the helical spring 22 against an outer surface 45 of the output member 25 and, more particularly, the lugs 39 of the output member 25.

The first and second radial retaining elements 54, 55 respectively of the input member 24 and of the cover 33 make it possible to avoid the friction of at least one turn of the helical spring 22 against the outer surface 45 of the member of outlet 25 and, therefore, to optimize the outer diameter of the outlet member 25. The outer diameter of the outlet member 25 is defined by a circle passing through the outer surface 45 of each of the ears 39 of the output device 25.

The first and second radial retaining elements 54, 55 respectively of the input member 24 and the cover 33 make it possible to guarantee the radial retention of the helical spring 22 relative to the input member 24, to the output member 25 and to the cover 33, during the manufacture of the brake spring 15 and when operating the spring brake 15.

In this way, the lubrication of the spring brake 15 and, in particular, of the area of contact between the coil spring 22 and the internal surface 27 of the housing 26 of the drum 23 is improved.

Advantageously, the first side C1 and the second side C2 of the spring brake 15 are defined with respect to the axis of rotation X.

Here, the axis of rotation X extends through the center of the spring brake 15 and, more particularly, between the drive tooth 31 and the spacer 34, in the assembled configuration of the spring brake 15.

With reference to the figure 4 , the first side C1 of the spring brake 15 is located to the right of the axis of rotation X. In addition, the second side C2 of the spring brake 15 is located to the left of the axis of rotation X.

Advantageously, the first and second radial holding elements 54, 55 respectively comprise a rib extending partially between the input member 24 and the cover 33, in the direction of the axis of rotation X, in the assembled configuration of the spring brake 15.

Thus, the radial retention of the coil spring 15 relative to the input member 24, to the output member 25 and to the cover 33 is implemented in an axial direction of the spring brake 15 and, more particularly, according to the axis of rotation X, so as to guarantee the alignment of the members 22, 24, 25, 33 of the spring brake 15.

Advantageously, an outer surface 46 of the first radial holding element 54 and an outer surface 47 of the second radial holding element 55 are configured to cooperate with at least one turn of the helical spring 22.

Thus, the radial retention of the coil spring 15 relative to the input member 24, to the output member 25 and to the cover 33 is implemented by the support of at least one turn of the coil spring 22 against an outer surface of the inlet member 24 and an outer surface of the cover 33.

Here, the radial retention of the coil spring 15 relative to the input member 24, to the output member 25 and to the cover 33 is implemented by the support of at least a first turn of the coil spring 22 against an outer surface of the input member 24 and by bringing at least a second turn of the helical spring 22 into support against an outer surface of the cover 33.

Advantageously, in the assembled configuration of the spring brake 15, the first leg 29a of the coil spring 22 is disposed between the first surface 38a of the drive tooth 31 of the input member 24 and the spacer 34. Further, the second leg 29b of the coil spring 22 is disposed between the second surface 38b of the drive tooth 31 of the input member 24 and the spacer 34.

Advantageously, the input member 24 and the cover 33 and, more particularly, the first and second plates 30, 32 are kept integral in rotation about the axis of rotation X, in the assembled configuration of the spring brake 15.

Here, the inlet member 24 and the cover 33 are fixed to each other by means of fasteners 52a, 52b.

Advantageously, the fixing elements 52a, 52b of the input member 24 and of the cover 33 are elastic snap fastening elements arranged at the level of the drive tooth 31 and of the spacer 34.

In this exemplary embodiment, a first fixing element 52a of the input member 24 is provided at the level of the drive tooth 31 of the input member 24. In addition, a second fixing member 52a of the input member 24 is provided at the level of the spacer 34 of the input member 24.

Here, the input member 24 comprises two fixing elements 52a and the cover 33 comprises two fixing elements 52b.

With reference to the figure 4 , only one of the fixing elements 52b of the cover 33 is shown.

The number of elements for fixing the inlet member and the cover is not limiting and may be different, in particular greater than or equal to three.

As a variant, not shown, the input member 24 and the cover 33 and, more particularly, the first and second plates 30, 32 can be held together by simple interlocking.

The output device 25 is configured to be connected to the screen 2 of the concealment device 3.

Advantageously, the inlet member 24 and the outlet member 25 are made of plastic.

In addition, the cover 33 is made of plastic.

By way of non-limiting example, the plastic material of the inlet member 24, of the outlet member 25 and of the cover 33 may be poly-butylene terephthalate, also called PBT, or poly-acetal, also called POM.

As a variant, the outlet member 25 can be made of zamac (acronym for the names of the metals which compose it: zinc, aluminum, magnesium and copper).

Preferably, the drum 23 is made of steel, in particular of sintered steel.

Thus, the use of sintered steel to produce the drum 23 makes it possible to reduce the friction resistance of the coil spring 22 against the internal friction surface 27 of the housing 26 of the drum 23.

Thanks to the present invention, the first and second radial retaining elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to guarantee the radial retention of the helical spring with respect to the input member, to the output member and to the cover, when manufacturing the spring brake and when operating the spring brake, as well as reducing the operating noise of the spring brake, when operating the spring brake. 'drive in rotation of the input member and / or the output member inside the housing of the drum.

In this way, the first and second radial retaining elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to avoid manufacturing defects linked to a misalignment of the spring. helical with respect to the input member, to the output member and to the cover.

Consequently, the first and second radial retaining elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to ensure the positioning of the coil spring inside the housing of the. drum, during assembly of the spring brake and, more particularly, during an operation of loading the coil spring.

In addition, during assembly of the spring brake, the first and second radial holding elements of the input member and of the cover extending respectively between the drive tooth and the spacer make it possible to limit friction of the coil spring on the internal friction surface of the drum housing and therefore avoid the removal of at least part of a lubricant deposited on this internal friction surface and on the coil spring.

Numerous modifications can be made to the embodiments described above without departing from the scope of the invention defined by the claims.

As a variant, not shown, the electronic control unit 44 is placed outside the casing 13 of the electromechanical actuator 11 and, in particular, mounted on the frame 20 or in the torque support 19.

In addition, the embodiments and variants envisaged can be combined to generate new embodiments of the invention, without departing from the scope of the invention defined by the claims.

Claims (10)

1. An electromechanical actuator (11) for a home automation installation for closing or sun protection,

   the electromechanical actuator (11) comprising at least:

   - an electric motor (12),

   - a gearbox (14), and

   - a spring brake (15),

   the spring brake (15) comprising at least:

   - a coil spring (22),

   - a drum (23), the drum (23) comprising a housing (26), the housing (26) of the drum (23) comprising an internal friction surface (27) configured to mate with at least one winding of the coil spring (22),

   - an input member (24),

   - an output member (25), and

   - a cover (33),

   ▪ the input member (24) comprising a driving tooth (31), the driving tooth (31) extending between the input member (24) and the cover (33), in an assembled configuration of the spring brake (15), and

   ▪ the input member (24) or the cover (33) comprising a spacer (34), the spacer (34) extending between the input member (24) and the cover (33), in the assembled configuration of the spring brake (15),

   characterized in that the input member (24) comprises a first radial holding element (54) of the coil spring (22) extending between the driving tooth (31) and the spacer (34), along a first side (C1) of the spring brake (15), in the assembled configuration of the spring brake (15),

   and in that the cover (33) comprises a second radial holding element (55) of the coil spring (22) extending between the driving tooth (31) and the spacer (34), along a second side (C2) of the spring brake (15), in the assembled configuration of the spring brake (15), the second side (C2) of the spring brake (15) being opposite the first side (C1) of the spring brake (15), relative to an axis of rotation (X) of the spring brake (15).
2. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to claim 1, characterized in that the first and second radial holding elements (54, 55) respectively comprise a rib extending partially between the input member (24) and the cover (33), along the direction of the axis of rotation (X), in the assembled configuration of the spring brake (15).
3. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to claim 1 or claim 2, characterized in that an external surface (46) of the first radial holding element (54) and an external surface (47) of the second radial holding element (55) are configured to mate with at least one winding of the coil spring (22).
4. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to one of the claims 1 to 3, characterized in that:

   - the coil spring (22) is formed from a wire (48),

   - a first end of the coil spring (22) forms a first tab (29a),

   - a second end of the coil spring (22) forms a second tab (29b), and

   - each of the first and second tabs (29a, 29b) extends radially relative to the axis of rotation (X) and toward the interior of the coil spring (22).
5. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to claim 4, characterized in that, in the assembled configuration of the spring brake (15), the first tab (29a) of the coil spring (22) is configured to mate with a first surface (38a) of the driving tooth (31) of the input member (24) and in that the second tab (29b) of the coil spring (22) is configured to mate with a second surface (38b) of the driving tooth (31) of the input member (24), the second surface (38b) of the driving tooth (31) being opposite the first surface (38a) of the driving tooth (31).
6. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to claim 5, characterized in that, in the assembled configuration of the spring brake (15), the first tab (29a) of the coil spring (22) is disposed between the first surface (38a) of the driving tooth (31) of the input member (24) and the spacer (34) and in that the second tab (29b) of the coil spring (22) is disposed between the second surface (38b) of the driving tooth (31) of the input member (24) and the spacer (34).
7. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to one of the claims 4 to 6, characterized in that:

   - the input member (24) comprises a first plate (30),

   - the cover (33) comprises a second plate (32), and

   - in the assembled configuration of the spring brake (15), the first tab (29a) of the coil spring (22) extends along the second plate (32) of the cover (33) and the second tab (29b) of the coil spring (22) extends along the first plate (30) of the input member (24).
8. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to one of the claims 1 to 7, characterized in that the input member (24) and the cover (33) are rigidly connected around the axis of rotation (X), in the assembled configuration of the spring brake (15).
9. An electromechanical actuator (11) for a home automation installation for closing or sun protection according to claim 8, characterized in that the input member (24) and the cover (33) are fastened to one another by means of fastening elements (52a, 52b) and in that the fastening elements (52a, 52b) of the input member (24) and of the cover (33) are resilient snap-action fastening elements disposed at the driving tooth (31) and at the spacer (34).
10. A home automation installation for closing or sun protection comprising a rolling tube, an electromechanical actuator, and a screen (2) rollable onto said rolling tube (4) rotationally driven by said electromechanical actuator (11), characterized in that the electromechanical actuator (11) is according to one of the claims 1 to 9.

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