FR3075850A1 - MOTORIZATION ASSEMBLY OF FLYING SHUTTER AND MECHANICAL FUSE OF PROTECTON OF THIS MOTORIZATION ASSEMBLY - Google Patents

Abstract

A swing shutter motor assembly (10) comprising a first electromechanical module (M1 comprising a first electric motor (MA), the motor assembly comprising a mechanical link (LM), the first electric motor being configured to be connected through the mechanical connection to a flap of the flap (5) so as to drive the flapper during the electrical activation of the first electric motor, the mechanical connection comprises a mechanical fuse (200), the latter comprising a fuse body (202), connected to a first part (LM I) of the mechanical connection (LM) and a fuse ring (204) connected to a second part (LM2) of the mechanical connection, the fuse body and the fuse ring being interconnected by at least one breakable connection bridge (211, 212, 213), the connection bridge being able to be broken under the application of a force greater than a value predetermined force.

Description

Description

Title of the invention: MOVING SHUTTER MOTOR ASSEMBLY AND MECHANICAL FUSE

PROTECTION OF THIS ENGINE ASSEMBLY

The invention relates to a set of motorized shutter shutters to be fixed at an opening in a building, as well as to a home automation system comprising such a set of motorized shutters.

In the field of home automation, it is known to use a set of motorized shutters to be fixed to an architectural element of an opening, such as a lintel or a window threshold so as to automate the closing and the opening of swing shutters.

Numerous motorization solutions make it possible to manage the opening and closing movements of swinging shutters: it is known to use either one motor per leaf, or only one motor for a component composed of two leaves or leaves which can pivot on hinges so as to cover an opening in a building, or to leave it uncovered.

In all cases, the solutions of the prior art define a synchronization of the movements of the two leaves. Indeed, the flaps must be closed or opened in a particular order, due to their asymmetry and the presence of a joint cover, that is to say a cover blade from one leaf to the other . Indeed, the main leaf, comprising the cover blade or joint cover, must be driven first at the opening and last at the closure to ensure that the cover blade covers a so-called secondary leaf.

[0005] A first motorization solution consists in using a unitary motorization assembly, integrating in a single housing the two motors for each leaf, Another motorization solution consists in using independent motorization modules, each comprising a motor, assigned to the motorization of a leaf.

[0006] Thus, a first mechanical module comprising a first motor drives a first leaf and a second mechanical module comprising a second motor causes a second leaf. One of the two modules also includes an electronic control unit for the first and second motors. Thus, the module comprising the control unit is qualified as an electromechanical module. These two modules are generally covered with a finishing cover. Each module also includes a mechanical transmission device, in particular a pinion transmission device, making it possible to transmit the movements provided respectively by the motors to the main and secondary leaves. A transmission shaft is located at the output of these transmission devices. Arms connect the transmission shaft to the leaves to transmit the motor's rotational movement in a corresponding movement of the leaf around its hinges.

Known engine assemblies therefore include an electronic control unit, which controls the power supply to the motors and in particular has electronic monitoring means, in particular means for detecting an abutment force (by measuring engine torque, torque variation or underspeed). These force detection means make it possible to stop the engine when the detected forces exceed a predetermined threshold. This avoids damaging the motor if the force is too great.

The forces detected at the level of the electronic unit are consecutive to forces applied to at least one of the leaves, in particular due to an obstacle or gusts of wind when the flap is in motion or in the intermediate position between the fully open position and the fully closed position of the leaves or of an intrusion attempt, for example when the shutter is closed. These forces are transmitted along the kinematic chain, that is to say at the level of the arms then of the mechanical transmission devices to the engine. Although taken into account in the predefined thresholds of forces bearable by the engine, the forces actually collected by the elements of the kinematic chain, because brutal, can lead in spite of the electronic monitoring means, to damage of the components of this chain kinematics between the leaf and the motor.

If the torque due to violent forces on the leaves is transmitted along the kinematic chain to the engine, the transmission device or the engine itself can be damaged. The force detection means provided at the electronic control unit can make it possible to limit the forces, for example those supplied by the motor if they are contrary to the forces exerted on the leaf. However, they cannot always protect the drive train. For example, in a particular case where a connection between the propeller shaft and the arm is in the form of a hexagonal connection, significant efforts can lead to degradation of the hexagonal connection, at the level of an arm or at the level of a drive shaft, causing significant play, or even a sliding of one of the parts relative to the other in subsequent movements. The motorization assembly may then no longer be able to transmit the torques necessary for driving the leaves in rotation.

In parallel with these brutal efforts, other efforts of lower intensity, in other words whose intensity is below a predetermined threshold recorded at the electronic unit, can intervene regularly on the kinematic chain. Due to their lower intensity than the thresholds prerecorded in the electronic unit, these efforts are not necessarily judged as critical by the electronic unit and therefore do not lead to any particular action. However, the repetition of these efforts can lead to fatigue of the materials of the kinematic chain and in a more or less long time, weaken them until a possible rupture.

It is to these drawbacks that the invention more particularly intends to remedy by proposing a motorized assembly protected in the event of exceeding a predefined torque applied to the flaps of the shutter and with a resistance to mechanical fatigue resulting from the application of repeated loads.

In this regard, the present invention relates, according to a first aspect, a motorized shutter assembly comprising at least a first electromechanical module, the first electromechanical module comprising at least a first electric motor, the motorization assembly comprising at least one mechanical connection (LM) comprising a first part and a second part, the mechanical connection comprising - a mechanical transmission device, - a transmission shaft at the output of the mechanical transmission device, - an arm, the first electric motor being configured to be connected, in the assembled configuration of the motorization assembly, by means of the mechanical connection, to a leaf of the shutter so as to drive the leaf during the electrical activation of the first electric motor.

According to the invention, the mechanical connection further comprises a mechanical fuse, the mechanical fuse comprising a fuse body, connected to the first part of the mechanical connection and a fuse ring connected to the second part of the mechanical connection , the fuse body and the fuse ring being interconnected by at least one breakable connection bridge, the connection bridge being able to be broken under the application of a force of a value greater than a value d 'predetermined effort.

Thus, the mechanical fuse interposed between the two parts of the mechanical connection ensures the protection of the electric motor. The rupture of the connection bridge between the fuse body and the fuse ring makes it possible to break the mechanical connection and avoid the transmission of forces greater than the preset force value to the motor. The assembly comprising the fuse ring and at least part of the connection bridges can be considered as a breakable part, connected to the fuse body and capable of detaching from it under the application of a force of value greater than a predetermined force value. The fuse ring cooperates with the second part of the mechanical connection, being fixed in rotation relative to the second part of the mechanical connection.

In particular, the second part of the mechanical connection may include a reception area for receiving the fuse ring, the latter thus cooperating with the reception area of the second part of the mechanical connection.

According to an advantageous characteristic, the arm is integral with the fuse body and the fuse ring is mounted fixed in rotation on the transmission shaft.

According to an advantageous characteristic, the motor assembly comprises a washer and a fixing screw holding the arm and the mechanical fuse on the transmission shaft, the washer comprising an outside diameter greater than the inside diameter of the fuse body.

The washer thus covers the area of the fuse and holds the fuse body and the arm to prevent it from "falling" from the transmission axis by gravity after the breaking of the connection bridge (s). The arm will therefore not be able to damage the flap by falling. In addition, the washer being tightened by the fixing screw on the drive shaft, at the fuse ring, it tends to take a curved shape which avoids transmitting the tightening at the connection bridge (s) of the mechanical fuse.

Avoiding in fact tightening the washer on the connection bridge or bridges of the mechanical fuse, these are left free from any mechanical stress which could affect their behavior at break.

According to an advantageous characteristic, the fuse ring comprises a central opening of polygonal shape, in particular hexagonal, cooperating with a transmission shaft of corresponding external shape.

According to an advantageous characteristic, the fuse body and the fuse ring are separated by at least one oblong hole having an internal curvature along an external edge of the fuse ring and an external curvature along an internal edge of the body fuse.

Thus, the oblong hole (s) extend between the fuse body and the fuse ring.

According to an advantageous characteristic, the oblong hole has a substantially regular width with the exception of its ends at which this width gradually decreases, the ends of the oblong hole being rounded.

In other words, a connection bridge has a variable width, taken in a direction perpendicular to the radii of the fuse ring.

Thus, the narrower portion ensures the mechanical rupture of the connection bridge and the detachment of the fuse ring relative to the fuse body.

Under the effect of a force greater than a predetermined force value, the mechanical fuse thus ensures the total rupture of the mechanical connection.

The rounded shape of the ends of the oblong holes forms connection bridges without breaking the slope, which allows the control of the breaking forces of these bridges.

According to an advantageous characteristic, the connection bridge comprises a preferential mechanical rupture zone, the mechanical rupture zone being situated at the level of the smallest width of the connection bridge.

Thus, the mechanical rupture zone corresponds to a zone of lower mechanical resistance, facilitating its sectioning.

According to an advantageous characteristic, the number of connection bridges is greater than or equal to two, the connection bridges being evenly distributed between the fuse body and the fuse ring.

Thus, the mechanical rupture zones are regularly distributed, as are the mechanical stresses and the movement of the fuse ring relative to the fuse body after rupture is facilitated.

According to an advantageous characteristic of the invention, the motor assembly comprises an electronic control unit, the control unit comprising electronic monitoring means, in particular means for detecting an abutment force, intended for stop the electric motor when forces detected at the level of the electric motor or on the mechanical connection exceed a predetermined threshold.

Thus, the electronic monitoring means, associated with the mechanical fuse, ensure the protection of the engine assembly against forces having variable values.

The present invention aims, according to a second aspect, a home automation installation comprising at least one shutter and a motor assembly according to the invention, assembled with the shutter.

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

The invention will be better understood and other advantages of it will appear more clearly in the light of the following description of an embodiment of a motorized shutter assembly, given solely by way of example and made with reference to the accompanying drawings in which: [0036] [fig.l] is a perspective view of a home automation installation comprising a motorized swing shutter, [0037] [fig.2] is a schematic representation of a motor assembly according to the invention in the mounted configuration, [fig.3] is a schematic view of an electronic control unit of a motor assembly according to the invention, [0039] [ fig.4] is a side view of a part of an electromechanical module of a motor assembly according to a first embodiment of the invention, [fig.5] is a side view of '' part of an electromechanical module of a set the motorization according to a first embodiment of the invention.

[Fig.6] is a partial sectional view of part of an electromechanical module of a motor assembly according to a first embodiment of the invention, [fig.7] is a partial sectional view of a part of an electromechanical module of a motor assembly according to a first embodiment of the invention, [fig. 8] is a partial view of an arm of the 'motor assembly according to the invention.

Figures 1 and 2 show a home automation installation 100 of the shutter installed at an opening 2 of a building 3, for example an opening with a window not shown. The installation comprises a motorization assembly 1 fixed to a lintel 4, above the opening 2. The opening 2 is equipped with a flap 5 composed of two leaves or leaves 5a and 5b which can pivot on hinges 6a , 6b so as to cover the opening 2 or to leave it uncovered, as shown in this figure. The motorization assembly 1 comprises a finishing cover 10, covering part of the various components of the motorization assembly 1. The motorization assembly 1 thus controls a shutter installation with a main leaf 5a comprising a covering blade 7 or joint cover and a secondary leaf 5b.

The main leaf 5a must be piloted first at the opening and last at the closing to ensure that the cover blade 7 comes to cover the secondary leaf 5b.

The engine assembly i comprises a first electromechanical module Ml provided with a first electric motor MA and an electronic control unit 20, a second mechanical module M2 provided with a second electric motor MB. The electronic control unit 20 is in electrical connection with the two motors MA, MB. Each module M1, M2 also comprises a mechanical transmission device 8a, 8b, in particular a pinion transmission device, making it possible to transmit the movements provided respectively by the motors MA, MB to the leaves 5a, 5b. Arms 9a, 9b connect the transmission devices 7a, 7b to the leaves 5a, 5b to transmit the rotational movement of the motor MA, MB corresponding in a movement of the leaf 5a, 5b around its hinges 6a, 6b. We denote by LM the mechanical connection between the electric motor MA, MB and the corresponding leaf 5a, 5b, in the assembled configuration of the motorization device.

Upon receipt of a shutter movement control order, the electronic control unit 20 controls the activation of the two motors MA, MB according to a sequence comprising a time difference between the activation of the priority motor MA and of the secondary motor MB: when the flap 5 is opened, the priority motor MA is the motor activated first, the secondary motor MB being activated with a time offset To relative to the secondary motor MB, while at on closing, the priority motor MA is activated second, with a time offset Tf relative to the secondary motor MB, the offsets during opening and closing can be equal or different.

Preferably, the electromechanical module Ml is associated with the main leaf 5a and the mechanical module M2 is associated with the secondary leaf 5b. In a reverse mounting case (the priority motor MA being associated with the control of the secondary leaf 5b, the secondary motor MB being respectively associated with the main leaf, 5a), it is then necessary to reverse the piloting sequence, that is to say that is, to reverse the priorities associated with the two drivers. This reversal of priority can be configured and stored in a memory (not shown) of the electronic control unit 20.

In the case of the motorization of a single flap, the motorization assembly 1 comprises an electromechanical module Ml comprising an electric motor MA and an electronic control unit 20.

The engine assembly 1 according to the invention, in particular the electronic control unit 20, comprises hardware and / or software means governing the control of the motors MA, MB. The software means include computer programs.

The electronic control unit, shown in FIG. 3, is supplied from the commercial electrical network, for example 230V AC or from another energy source such as a battery and / or a solar panel. The electronic unit 20 comprises an electronic card 30 on which the electronic components for controlling the two motors are installed, in particular a microprocessor 31 comprising information inputs and outputs intended for controlling the motors MA, MB, a receiver 21, in particular of the radio frequency type, making it possible to receive control orders from a remote control point 110, in particular from a radio remote control or a wired remote control connected to the control unit 20, a man-machine interface comprising a display digital 22, simple control buttons (open, close, stop - alternately or sequentially - programming) 23 and / or one or more light-emitting diodes 24. The Man-Machine interface is possibly accessible during installation , but is no longer (or difficult) once the finishing cover 10 of the motorization assembly 1 is positioned on the modules Ml, M2 . The buttons 23 can be used for manual control of the motors MA, MB and for pairing or association between the electronic control unit 20 and the remote control point 110.

The electronic control unit 20 further comprises means for detecting a DBE abutment force. These can act by measuring torque, torque variation or underspeed. In the event of a predetermined threshold C1 of torque being exceeded or of torque variation, the electronic control unit 20 cuts off the power supply to the motor. The electronic control unit 20 can also include position counting means (not shown).

The motor assembly 1 also includes a chassis 40 on which the mechanical Ml and electromechanical M2 modules are fixed. According to a first embodiment, the chassis 40 comprises two independent chassis elements 40a, 40b, which can be fixed to the lintel 4 of the opening 2. According to a second embodiment, the chassis 40 is a one-piece chassis, custom-made for an opening 2. The length of the chassis 40 is then adapted to the width of the opening 2. The two electromechanical modules Ml and mechanical M2 are installed independently on the chassis 40.

The chassis 40 visible in FIGS. 4 and 5 is a metal support, in the form of a plate, comprising a flat base 42, intended to be fixed against the lintel 4 and an opposite face 43 provided with slides 45, 46, 47.

The flat base 42 of the chassis 40 comprises fixing holes (not shown), these being intended for the passage of fixing screws (not shown) making it possible to fix the chassis on the lintel 4.

The slides 45, 46, 47 serve to guide and maintain an Ml or M2 module of the motor assembly 1 on the chassis 40 when the latter is fixed in position at the lintel 4; The chassis 40 thus comprises a central slide 46 and two parallel lateral slides 45, 47.

Different walls of the slide 45 thus form a slightly closed U-shaped rail, leaving free a longitudinal opening whose width i45 is less than the width 145 of the rail formed by the slide 45 and therefore less than said head of 65t screws. The slides 46 and 47 are constructed substantially on the same model as the slide 45. The side slides 45, 47 each further comprise a wall 48, 49 extending in the extension of one of the side walls, on the edges of the frame. 40. These walls 48, 49 form a guide for the mechanical M2 or electromechanical module Ml to be mounted on the chassis 40. The screws 65, 66, 67 whose heads 65t, 66t, 67t can slide in the slides are fixed on the module to be mounted on the chassis element, as shown in FIG. 4. Thus, the screws 65, 66, 67 form suspension means for the module Ml or M2 in the chassis 40.

Once fixed, the chassis is locked in rotation and in translation, thus making it possible to support the torques used during the transmission of the mechanical force between the motors and the swing leaves of the shutters. The independent chassis 40 or chassis elements 40a, 40b are fixed at the level of the area where the main forces are found during the operation of the motorization assembly 1. Any other means of fixing the electromechanical module to the chassis or directly to a support surface is also possible.

The following description being similar for the two modules, only one will be described with reference to FIGS. 6, 7 and 8.

The module Ml comprises a housing 60 supporting the motor MA, the transmission device 8a and the arm 9a. The housing 60 can be in several parts assembled to each other by suitable fixing means (not shown). The housing also supports an output shaft 70 of the transmission device 8a, hereinafter called the transmission shaft. The arm 9 is mounted on this shaft 70 by means of a washer 71 and a fixing screw 72 visible in FIG. 6. The face of the housing supporting the arm 9 is called the top 62 of the housing while the opposite one is called base 61 of the housing.

Once the modules Ml and M2 are fixed, the corresponding arms 9a, 9b are free to move in rotation to drive the leaves 5a, 5b.

During a particularly large force exerted on one of the leaves 5a, 5b, for example under the effect of a strong gale, the arm is driven in rotation independently of the motor, which has the effect of creating a significant torque at the connection between the arm 9a, 9b and the corresponding transmission shaft 70.

The engine assembly includes a mechanical fuse 200, installed on the mechanical link LM between the electric motor MA, MB and the corresponding leaf 5a, 5b. A mechanical fuse is equivalent to a device for breaking a kinematic chain, here the mechanical link LM between the motor and the flap, as illustrated in FIG. 3. The mechanical link LM comprises a first part LM 1 and a second part LM2 , the mechanical fuse 200 being inserted between the two parts LM1, LM2 of the mechanical link LM. In particular, the mechanical fuse 200 is inserted between the transmission shaft 70 and the arm 9a, 9b. The mechanical fuse 200 participates in the mechanical transmission between the motor MA, MB and the leaf 5a, 5b in an assembled configuration of the motorization assembly, and is configured to break this mechanical connection LM during the application of a force. greater than a predefined force, for example in the event of a predefined force being exceeded, for example of a rotating torque known as breaking C2 at the level of the mechanical fuse 200. For this purpose, it could be installed between each motor MA, MB and the corresponding arm 9a, 9b, other than between the transmission shaft 70 and the arm 9a, 9b. In the first embodiment shown in Figures 4 to 7, the mechanical fuse 200 is integrally formed with the arm 9a, 9b. The arm 9a, 9b and the mechanical fuse 200 are fixed to the transmission shaft by the washer 71 and the fixing screw 72.

The mechanical fuse 200 comprises a fuse body 202 and a fuse ring 204, interconnected by at least one connection bridge, in the example by three connection bridges 211, 212, 213, under the application of a breaking torque C2. This breaking torque is of the order of 200 Nm, for example between 180 Nm and 250 Nm. Thus, the assembly comprising the fuse ring 202 and at least part of the connection bridges 211, 212, 213 can be considered as a breakable part, connected to the fuse body 202 and able to detach from it under the application of a force of a value greater than a predetermined force value. The fuse ring 202 cooperates with the second part LM2 of the mechanical link LM, by being fixed in rotation relative to the second part LM2 of the mechanical link LM.

According to the representations of Figures 6 to 8, the fuse body 202 is a substantially annular body having a central opening 202o. The fuse body is possibly a part of the arm 9a, 9b itself. Fuse ring 204 is also a substantially annular and planar body. The mechanical fuse 200 comprises, in the embodiment described, a plurality of connection bridges 211, 212, 213 in the form of breakable parts connecting the fuse body 202 to the fuse ring 204. These connection bridges 211, 212, 213 extend from an internal edge 202i of the fuse body 202 towards an external edge 204e of the fuse ring 204. The connection bridges 211, 212, 213 each have a preferential zone of mechanical rupture 231, 232, 233. Each bridge connection 211, 212, 213 has in fact a variable width, taken in a direction perpendicular to the radii of the fuse ring 204. A preferred zone of mechanical rupture 231, 232, 233 is located at the level of the smallest width , corresponding to a zone of less mechanical resistance, facilitating the cutting of the connection bridge 211, 212, 213.

The thicknesses of the connection bridges 211, 212, 213 are equal over the entire length of the connection bridge 211, 212, 213. They could however be different, with in particular a lesser thickness at the level of the smallest width.

Due to the arrangement of the connection bridges 211, 212, 213 between the fuse body 202 and the fuse ring 204, the fuse body and the fuse ring are separated by oblong holes 221, 222, 223 having a radius of curvature, in particular an internal curvature along the external edge 204e of the fuse ring 204 and an external curvature along the internal edge 202i of the fuse body 202. These oblong holes 221, 222, 223 have a substantially regular width with the exception of their ends 221a, 221b, 222a, 22b, 223a, 223b at which this width gradually decreases, the ends of the oblong holes 221, 222, 223 being rounded.

The fuse ring 204 includes a central opening 204o of hexagonal shape intended to cooperate with a hexagonal shape of the transmission shaft 70 by forming a hexagonal connection. The mechanical fuse 200 can thus be assembled without play, or with controlled play, with the transmission shaft 70, by inserting the fuse ring 204 on the transmission shaft 70. The cooperation of the shapes of the opening central 204o with the external shape of the transmission shaft 70 ensures the rotation drive of the arm by the transmission shaft, through connection bridges 211, 212, 213, in normal operation. In other words, the second part LM2 of the mechanical link LM comprises in particular the transmission shaft 70, which forms a reception area for the fuse ring 204, in particular for the central opening 204o of the fuse ring 204.

The three connection bridges 211, 212, 213 are distributed regularly inside the fuse body 202, in other words around the fuse ring 204. The oblong holes 221, 222, 223 are formed by cutting out material by laser cutting, striking or wire cutting. Alternatively, the fuse ring and the fuse body are made by other manufacturing processes, such as machining, injection, additive manufacturing, etc.

When the forces associated with the movement of the leaf 5a, 5b are less than the predefined threshold C1 or the breaking torque C2, the cooperation of the transmission shaft 70 with the mechanical fuse 200 causes the arm 5a to rotate. , 5b under the action of the corresponding MA or MB motor.

During the application of a large force on one of the leaves 5a, 5b, the torque exerted at the fuse exceeding the predefined breaking torque C2, the connection bridges 211,212, 213 are subjected to shearing forces important which lead to the rupture of these connection bridges 211, 212, 213.

Advantageously, the sections of the various connection bridges 211, 212, 213 are preferably identical to each other, as is their constituent material. The connection bridges 211, 212, 213 being regularly distributed around the axis of the drive shaft, the shearing forces are the same at each connection bridge, which leads to their simultaneous rupture. Indeed, the breaking torque C2 is then applied to each of the connection bridges 211, 212, 213 in an equivalent manner. This avoids the breakage of one connection bridge 211, 212, 213 without the breakage of another, which would reduce the breaking torque necessary to cut the remaining connection bridges 211, 212, 213. Thus, following a rupture of the connection bridges 211, 212, 213, the fuse body 202 detaches axially and radially completely from the fuse ring 204. The rupture of the mechanical fuse 200 and the detachment of the fuse body 202 by relative to the fuse ring 204 releases the rotation between the arm 9a, 9b and the transmission shaft 70. The arm 9a, 9b thus rotates when empty and no longer risks driving the motor MA, MB or the device transmission 8a, 8b and damage them.

The rupture of the connection bridges 211, 212, 213 also allows free rotation of the motor MA, MB without driving the arm 9a, 9b, or vice versa, but while retaining a connection between the arm 9a, 9b and the shaft of transmission 70, in particular thanks to the washer 71. This prevents one end of the arm 9a, 9b from being free and the arm from knocking in the window during movements of the leaf 5a, 5b, for example under the effect of the wind.

The breaking torque C2 for the mechanical fuse 200 depends in particular on the number of connection bridges, their shape, their positioning in the mechanical fuse 200, as well as the materials chosen for the mechanical fuse 200 and the shaft of transmission 70.

To facilitate the free rotation of the moving parts on either side of the mechanical fuse 200, here the arm 9a, 9b and the transmission shaft 70, the mechanical rupture zone 231, 232, 233 is located at outside the circle C70 in which the transmission shaft 70 is circumscribed. In fact, it is preferable for the rupture zone to be located in a zone remote from the hexagonal connection in order to avoid deformation of the latter and a clearance taken between the transmission shaft 70 and the fuse ring 204. This also prevents damage to the drive shaft during movements of the arm or the drive shaft after breakage.

The rounded end of the oblong holes 221, 222, 223 forms connection bridges, the edges of which do not have a slope break. The rounded end of the oblong holes 221, 222, 223 is formed in particular by a succession of circles of different radii, at least two circles of different radii being tangent. This allows the control of the breaking forces of these bridges. A break in slope would weaken the bridge without this fragility could not be well controlled. In the example of FIG. 8, the radius at the ends of the oblong holes 221, 222, 223 is of the order of 0.5 mm, which makes it possible to concentrate the stresses in static and to create a mode of breakage in shear . Such a smaller radius at the ends also makes it possible to reduce the difference in stresses between the elastic resistance Re and the mechanical resistance Rm or resistance to rupture. The elastic resistance Re corresponds to the point on a tensile curve for a material between the elastic zone and the plastic zone, the tensile curve representing a stress, for example in MPa, as a function of a displacement, for example in mm. The tensile strength Rm corresponds to the point on the tensile curve corresponding to the maximum stress. The radius of curvature is about 3.5 mm away from the end, which improves the resistance to mechanical fatigue resulting from the application of repeated loads.

In addition, any angles forming slope breaks on the edges of the connection bridges 211, 212, 213 can be reduced or eliminated to increase the fatigue strength, by finishing processes, such as tribofinishing or brushing, when making the oblong holes 221, 222, 223 and the connection bridges 211, 212, 213.

Alternatively, the mechanical rupture zone 231, 232, 233, 234 is located on a circle Cr, called the median rupture circle, located substantially halfway between an outer edge 200e of the fuse body 202 and an inner edge 204i of the fuse ring 204. The median rupture circle passes through the mechanical rupture zones 231, 232, 233, lying at the level of the smallest width of the connection bridge (s) 211, 212,213.

According to a first embodiment, the mechanical fuse 200 is integrally formed with the arm 9a, 9b. In the event of over-effort causing the mechanical fuse 200 to rupture, only the arm 9a, 9b is to be replaced: it is a simple and inexpensive mechanical part. The integration of the mechanical fuse 200 in the arm 9a, 9b allows a simplification of the manufacturing and the assembly. The material used for the arm 9a, 9b and therefore for the mechanical fuse 200, has interesting properties in terms of resistance and plastic behavior. It is indeed important that the mechanical fuse 200 has little or no plastic deformation before it breaks, so as to avoid introducing rotational play (due to plastic deformation) in the transmission chain.

According to a second embodiment not shown, the mechanical fuse 200 is an independent part, for example coupled to the arm 9a, 9b and to the transmission shaft so as to transmit the movement in normal operation between the two parts of the kinematic chain. In the event of over-effort causing the mechanical fuse 200 to break, only the mechanical fuse 200 should be replaced. However, its design is more complex because it must integrate coupling means, in particular coupling means to the arm 9a, 9b.

Ideally, the mechanical fuse 200 is formed from high elastic limit steel, a material for which failure occurs quickly after the start of plastic deformation. Conversely, the material chosen for the drive shaft is as strong as possible: for example heat-treated steel. Mechanical fuse 200 can be produced by molding, machining, stamping, or other methods of obtaining it. In particular, the mechanical fuse can be produced by laser cutting: the shape cut by laser, for example allows the oblong holes to be produced with a selected section. The laser cuts are made so as to limit heating at the ends of the oblong holes by a passage of the laser beam in a short period of time.

The motor assembly can be suspended from a lintel above an opening, an arm holding element 9a, 9b on the drive shaft must be provided, which retains the axial assembly between the arm 9a, 9b and the transmission shaft 70 including in the event of the mechanical fuse 200 breaking. This holding element may comprise the fixing screw 72, screwed into a corresponding thread 73 provided in the transmission shaft 70, and the washer 71.

According to a particularly advantageous embodiment, a flat washer 71 is used, the washer comprising an outside diameter greater than the inside diameter of the fuse body 202. The washer 71 thus covers the area of the mechanical fuse 200 and maintains the body of fuse 202 and the arm 9a, 9b to prevent it from "falling" from the axis of gravity transmission after the connection bridges 211,212, 213. During the mounting of the arm 9a, 9b and the mechanical fuse 200 on the transmission shaft 70, the washer 71 is clamped between the arm 9a, 9b, at the level of the mechanical fuse 200 and the fixing screw 72. The washer 71 is tightened axially, along the axis X70 of l 'transmission shaft 70, opposite the end of the transmission shaft 70, at the center of the washer 71. The clamping forces thus cause a deformation of the washer 71 which takes a slightly curved shape from its center to its outer periphery. Thus, the contact between the peripheral part of the washer and the connection bridges 211, 212, 213 is limited. The washer therefore does not transmit axial mechanical stress, along the axis X70 of the transmission shaft 70, to the connection bridges 211, 212, 213. Otherwise, an axial stress could modify the behavior in mechanical resistance to the rupture of the connection bridges 211, 212, 213, that is to say the value of the rupture torque C2. This value would then be dependent on the tightening torque, which is random).

In the event that there is a controlled radial clearance between the mechanical fuse 200 and the transmission shaft 70, it must be caught up when the stop reaches normal operation. During a stop in the intermediate position, the presence of the washer 71, or of an equivalent Belleville washer, exerting an axial force tightening the arm 9a, 9b and the transmission shaft 70 makes it possible to generate sufficient stress to avoid a relative movement of the arm 9a, 9b relative to the transmission shaft 70. This prevents the flaps 5 from slamming under the effect of an external force like wind.

The invention is described above relating to the fixing of a frame element on a lintel, a lintel being generally defined as an architectural element for supporting the materials of a wall above an opening in a building. It is likewise applicable to the fixing of the chassis elements in the low position of the opening, that is to say at the level of a threshold of the opening, or in the lateral position, at the level of a lateral amount of the opening. The terms lintel, threshold or lateral upright all correspond to an architectural element of an opening.

Claims (1)

Claims [Claim 1] Motorization assembly (10) for a shutter (5) comprising at least a first electromechanical module (Ml), the first electromechanical module (Ml) comprising at least a first electric motor (MA), the assembly of motorization comprising at least one mechanical connection (LM) comprising a first part (LM1) and a second part (LM2), the mechanical connection (LM) comprising - a mechanical transmission device (8a, 8b), - a transmission shaft ( 70) at the output of the mechanical transmission device (8a, 8b), - an arm (9a, 9b), the first electric motor (MA) being configured to be connected, in the assembled configuration of the motorization assembly, by the intermediate of the mechanical connection (LM) to a leaf (5a, 5b) of the flap (5) so as to drive the leaf (5a, 5b) during Γ electrical activation of the first electric motor (MA), characterized in that the mechanical connection (LM) further includes u n mechanical fuse (200), the mechanical fuse (200) comprising a fuse body (202), connected to the first part (LM1) of the mechanical connection (LM) and a fuse ring (204) connected to the second part (LM2) of the mechanical link, the fuse body (202) and the fuse ring (204) being interconnected by at least one breakable connection bridge (211,212, 213), the connection bridge (211, 212 , 213) being able to be broken under the application of a force of a value greater than a predetermined force value (C2). [Claim 2] Motor assembly (10) according to claim 1, characterized in that the arm (9a, 9b) is integral with the fuse body (202) and the fuse ring (204) and is mounted fixed in rotation on the drive shaft (70). [Claim 3] Motor assembly (10) according to one of the preceding claims, characterized in that it comprises a washer (71) and a fixing screw (72) holding the arm (9a, 9b) and the mechanical fuse (200) on the drive shaft (70), the washer comprising an outside diameter greater than the inside diameter of the fuse body (202). [Claim 4] Motor assembly (10) according to one of the preceding claims, characterized in that the fuse ring (204) comprises a central opening (204o) of polygonal shape, in particular hexagonal, cooperating with the shaft transmission (70) of corresponding external shape. [Claim 5] Motor assembly (10) according to one of the preceding claims, characterized in that the fuse body (202) and the fuse ring (204) are separated by at least one oblong hole (221, 222 , 223) having an internal curvature along an external edge (204e) of the fuse ring (204) and an external curvature along an internal edge (202i) of the fuse body (202). [Claim 6] Motor assembly (10) according to one of the preceding claims, characterized in that the oblong hole (221, 222, 223) has a substantially regular width except for its ends at which this width decreases gradually, the ends of the oblong hole (221, 222, 223) being rounded. [Claim 7] Motor assembly (10) according to the preceding claim, characterized in that the connection bridge (211, 212, 213) comprises a mechanical rupture zone (231, 232, 233), the mechanical rupture zone ( 231, 232, 233) lying at the level of the smallest width of the connection bridge (211, 212, 213). [Claim 8] Motor assembly (10) according to one of the preceding claims, characterized in that the number of connection bridges (211, 212, 213) is greater than or equal to two, the connection bridges (211, 212 , 213) being evenly distributed between the fuse body (202) and the fuse ring (204). [Claim 9] Motor assembly (10) according to one of the preceding claims, characterized in that it comprises an electronic control unit (20), the control unit (20) comprising electronic monitoring means (DBE ), in particular means for detecting an abutment force, intended to stop the electric motor (MA) when forces detected at the level of the electric motor (MA) or on the mechanical link (LM) exceed a predetermined threshold (Cl) . [Claim 10] Home automation installation (100) comprising at least one hinged shutter (5) and a motorized assembly (10) according to any one of the preceding claims, assembled with the hinged shutter (5).