EP3502395B1 - Assembly for motorising a shutter and mechanical fuse for protecting said motorising assembly - Google Patents

Description

The invention relates to a hinged shutter motor assembly to be fixed at an opening in a building, as well as to a home automation installation comprising such a hinged shutter motor assembly.

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

Many motorization solutions make it possible to manage the opening and closing movements of swing shutters: it is known to use either one motor per leaf, or a single motor for a shutter made up 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 shutters 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 covering strip from one leaf to the other. . In fact, the main leaf, comprising the covering blade or joint cover, must be driven first when opening and last when closing to ensure that the covering leaf does indeed cover a so-called secondary leaf.

A first motorization solution consists of using a monobloc motorisation assembly, integrating the two motors for each leaf in the same box. Another motorisation solution consists of using independent motorisation modules, each comprising one motor, assigned to the motorisation of the leaf. 'a fighter.

Thus, a first mechanical module comprising a first motor drives a first leaf and a second mechanical module comprising a second motor drives a second leaf. One of the two modules also includes an electronic control unit for the first and second motor. Thus, the module comprising the control unit is referred to as an electromechanical module. These two modules are generally covered with a finishing cover. Each module also comprises a mechanical transmission device, in particular a gear transmission device, making it possible to transmit the movements supplied 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 rotational movement of the motor in a corresponding displacement of the leaf around its hinges.

Known motorization assemblies therefore comprise an electronic control unit, which controls the power supply to the motors and has in particular electronic monitoring means, in particular means for detecting a stop force (by measuring motor torque, variation of torque or underspeed). These force detection means make it possible to stop the motor when the forces detected exceed a predetermined threshold. This is to prevent damage to the motor in the event of too much force.

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 shutter is in motion or in an intermediate position between the fully open position. and the fully closed position of the leaves or 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 and then of the mechanical transmission devices to the engine. Although taken into account in the predefined thresholds of forces that can be tolerated by the engine, the forces actually received by the components of the kinematic chain, because they are brutal, can lead, despite the electronic monitoring means, to damage to the components of this chain. kinematics between the leaf and the motor.

If the torque due to the strong 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 level of 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 driveline. For example, in a particular case where a connection between the transmission shaft and the arm is in the form of a hexagonal connection, significant forces can lead to a degradation of the hexagonal connection, at the level of an arm or at the level. of a transmission shaft, causing significant clearances, or even a slippage 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 sudden forces, other forces of less intensity, in other words the intensity of which is less than a predetermined threshold recorded at the level of the electronic unit, can intervene regularly on the kinematic chain. Because of their lower intensity than the thresholds pre-recorded in the electronic unit, these forces 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 these drawbacks that the invention more particularly intends to remedy by proposing a motorization assembly protected in the event of a predefined torque being exceeded. applied to the shutter leaves and with resistance to mechanical fatigue resulting from the application of repeated loads.

• un dispositif de transmission mécanique,
• un arbre de transmission en sortie du dispositif de transmission mécanique,
• un bras,

le premier moteur électrique étant configuré pour être relié, en configuration assemblée de l'ensemble de motorisation, par l'intermédiaire de la liaison mécanique, à un battant du volet de sorte à entraîner le battant lors de l'activation électrique du premier moteur électrique.In this regard, the present invention aims, according to a first aspect, a hinged shutter motor assembly comprising at least a first electromechanical module, the first electromechanical module comprising at least a first electric motor, the motorisation assembly comprising at least one. mechanical link (LM) comprising a first part and a second part, the mechanical link 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 body fuse 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 predetermined force value .

Thus, the mechanical fuse interposed between the two parts of the mechanical connection ensures the protection of the electric motor. Breaking the connection bridge between the fuse body and the fuse ring breaks the mechanical link and prevents the transmission of forces greater than the predefined 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 therefrom under the application of a force of a value greater than a predetermined force value. The fuse ring cooperates with the second part of the mechanical link, being fixed in rotation with respect to the second part of the mechanical link.

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

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 the latter from “falling” from the transmission axis by gravity after the rupture of the connection bridge (s). The arm will therefore not be able to damage the shutter by falling. In addition, the washer being tightened by the fixing screw on the transmission shaft, at the level of the fuse ring, it tends to take a curved shape which avoids transmitting the tightening at the level of the connection bridge (s). of the mechanical fuse.

In fact, by avoiding tightening the washer on the connection bridge (s) of the mechanical fuse, they are left free of any mechanical stress which could affect their behavior at breakage.

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 following an external edge of the fuse ring and an external curvature following an internal edge of the fuse body.

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

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

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

Thus, the part of smaller width 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 complete rupture of the mechanical link.

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

According to an advantageous characteristic, the connection bridge comprises a preferential zone of mechanical rupture, the zone of mechanical rupture 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 cutting.

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

Thus, the mechanical rupture zones are regularly distributed, as are the mechanical stresses and the displacement 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 a stop force, intended to stop the motor. electrical when the forces detected at the level of the electric motor or on the mechanical link exceed a predetermined threshold.

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

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

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

• [Fig 1] est une vue en perspective d'une installation domotique comprenant un volet battant motorisé,
• [Fig 2] est une représentation schématique d'un ensemble de motorisation conforme à l'invention en configuration montée,
• [Fig 3] est une vue schématique d'une unité électronique de commande d'un ensemble de motorisation conforme à l'invention,
• [Fig 4] est une vue de côté d'une partie d'un module électromécanique d'un ensemble de motorisation conforme à un premier mode de réalisation de l'invention,
• [Fig 5] est une vue de côté d'une partie d'un module électromécanique d'un ensemble de motorisation conforme à un premier mode de réalisation de l'invention.
• [Fig 6] est une vue en coupe partielle d'une partie d'un module électromécanique d'un ensemble de motorisation conforme à un premier mode de réalisation de l'invention,
• [Fig 7] est une vue en coupe partielle d'une partie d'un module électromécanique d'un ensemble de motorisation conforme à un premier mode de réalisation de l'invention,
• [Fig 8] est une vue partielle d'un bras de l'ensemble de motorisation conforme à l'invention.

The invention will be better understood and other advantages thereof will emerge more clearly in the light of the following description of an embodiment of a hinged shutter motor assembly, given solely by way of example. and made with reference to the accompanying drawings in which:

• [ Fig 1 ] is a perspective view of a home automation system comprising a motorized hinged shutter,
• [ Fig 2 ] is a schematic representation of an engine assembly according to the invention in mounted configuration,
• [ Fig 3 ] is a schematic view of an electronic control unit for an engine assembly according to the invention,
• [ Fig 4 ] is a side view of part of an electromechanical module of an engine assembly according to a first embodiment of the invention,
• [ Fig 5 ] is a side view of part of an electromechanical module of a motorization assembly according to a first embodiment of the invention.
• [ Fig 6 ] is a partial sectional view of part of an electromechanical module of a motorization assembly according to a first embodiment of the invention,
• [ Fig 7 ] is a partial sectional view of part of an electromechanical module of a motorization assembly according to a first embodiment of the invention,
• [ Fig 8 ] is a partial view of an arm of the motorization assembly according to the invention.

The figures 1 and 2 show a home automation installation 100 with a shutter installed at an opening 2 of a building 3, for example an opening equipped with a window not shown. The installation includes a motorization assembly 1 fixed to a lintel 4, above the opening 2. The opening 2 is equipped with a shutter 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 cover strip 7 or joint cover and a secondary leaf 5b. The main leaf 5a must be driven first when opening and last when closing to ensure that the cover blade 7 comes to cover the secondary leaf 5b.

The motorization assembly 1 comprises a first electromechanical module M1 fitted with a first electric motor MA and an electronic control unit 20, a second mechanical module M2 fitted with a second electric motor MB. The electronic control unit 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 gear 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 to a movement of the leaf 5a, 5b around its hinges 6a, 6b. LM denotes 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 command, the electronic control unit 20 controls the activation of the two motors MA, MB according to a sequence comprising a time lag between the activation of the priority motor MA and of the secondary motor MB: during a shutter 5 opening command, 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 on closing, the priority motor MA is activated second, with a time offset Tf with respect to the secondary motor MB, the offsets on opening and closing being able to be equal or different.

Preferably, the electromechanical module M1 is associated with the main leaf 5a and the mechanical module M2 is associated with the secondary leaf 5b. In a case of reverse assembly (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 control sequence, i.e. that is, to reverse the associated priorities to both engines. This priority inversion can be configured and stored in a memory (not shown) of the electronic control unit 20.

In the case of the motorisation of a single shutter leaf, the motorisation assembly 1 comprises an electromechanical module M1 comprising an electric motor MA and an electronic control unit 20.

The motorization 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 on figure 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 radiofrequency 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 (opening, closing, stop - alternating or sequential -, programming) 23 and / or one or more light diodes 24. The Man-Machine interface is possibly accessible during installation , but no longer (or with difficulty) once the finishing cover 10 of the motorization assembly 1 is positioned on the modules M1, M2. The buttons 23 can be used for manual control of the MA and MB motors 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 stop force DBE. These can act by measuring torque, torque variation or underspeed. If a predetermined torque or torque variation threshold C1 is exceeded, the electronic control unit 20 cuts off the power to the motor. The electronic control unit 20 can also include position counting means (not shown).

The motorization assembly 1 also comprises a frame 40 on which the mechanical M1 and electromechanical M2 modules are fixed. According to a first embodiment, the frame 40 comprises two independent frame elements 40a, 40b, which can be fixed to the lintel 4 of the opening 2. According to a second embodiment, the frame 40 is a one-piece frame, made to measure for an opening 2. The length of the frame 40 is then adapted to the width of the opening 2. The two electromechanical M1 and mechanical M2 modules are installed independently on the frame 40.

The frame 40 visible to figure 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 frame 40 comprises fixing holes (not shown), these being intended for the passage of fixing screws (not shown) making it possible to fix the frame on the lintel 4.

The slides 45, 46, 47 are used to guide and hold a module M1 or M2 of the motorization assembly 1 on the frame 40 when the latter is fixed in position to the lintel 4; The frame 40 thus comprises a central slide 46 and two parallel lateral slides 45, 47.

Different walls of the slide 45 thus form a U-shaped rail slightly closed on itself, leaving free a longitudinal opening whose width i45 is less than the width l45 of the rail formed by the slide 45 and therefore less than said screw head 65t . 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 M1 module to be mounted on the frame 40. The screws 65, 66, 67, the heads of which 65t, 66t, 67t can slide in the guides are fixed on the module to be mounted on the frame element, as shown in figure 4 . Thus, the screws 65, 66, 67 form suspension means for the module M1 or M2 in the frame 40.

Once fixed, the frame is locked in rotation and in translation, thus making it possible to withstand the torques used during the transmission of the mechanical force between the motors and the swing leaves of the shutters. The frame 40 or the independent frame elements 40a, 40b are fixed at the level of the zone where the main forces are found during the operation of the motorization assembly 1. Any other means of fixing the electromechanical module to the frame 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 the figures 6 , 7 and 8 .

The module M1 comprises a housing 60 supporting the motor MA, the transmission device 8a and the arm 9a. The housing 60 may be in several parts assembled together 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 at the figure 6 . The face of the housing supporting the arm 9 is called the top 62 of the housing while the opposite one is called the base 61 of the housing.

Once the M1 and M2 modules 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 violent gust of wind, the arm is rotated independently of the motor, which has the effect of creating a large torque at the connection between the arm 9a, 9b and the corresponding transmission shaft 70.

The motorization assembly comprises 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 shutter, as illustrated in figure 3 . The mechanical link LM comprises a first part LM1 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 link LM when a force is applied. greater than a predefined force, for example in the event of a predefined force being exceeded, for example a so-called breaking torque C2 at the level of the mechanical fuse 200. For this purpose, it could be installed between each MA motor, MB and the corresponding arm 9a, 9b, elsewhere 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 capable of detaching therefrom 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, being fixed in rotation with respect 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 part of the arm 9a, 9b itself. The 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 inner edge 202i of the fuse body 202 to an outer edge 204e of the fuse ring 204. The connection bridges 211, 212, 213 each have a preferential mechanical rupture zone 231, 232, 233. Each connection bridge 211, 212, 213 in fact has a variable width, taken in a direction perpendicular to the radii of the fuse ring 204. A preferential mechanical rupture zone 231, 232, 233 is located at the level of the smaller width, corresponding to a zone of lower 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 outer edge 204e of the fuse ring 204 and an outer curvature along the inner edge 202i of the fuse body 202. These oblong holes 221, 222, 223 have a width substantially regular except for 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 comprises 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 204o central with the outer shape of the transmission shaft 70 ensures the rotational drive of the arm by the transmission shaft, through the connection bridges 211, 212, 213, in normal operation. In other words, the second part LM2 of the mechanical link LM includes 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 material by cutting. laser, by striking or by 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 rotation of the arm 5a, 5b under the action of the corresponding MA or MB motor.

When a large force is applied to one of the leaves 5a, 5b, the torque exerted at the level of the fuse exceeding the predefined breaking torque C2, the connection bridges 211, 212, 213 are subjected to large shear forces 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. Since the connection bridges 211, 212, 213 are regularly distributed around the axis of the transmission shaft, the shear 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 makes it possible to avoid the rupture of a connection bridge 211, 212, 213 without rupture of another, which would reduce the breaking torque necessary to sever the remaining connection bridges 211, 212, 213. Thus, following a rupture of the connection bridges 211, 212, 213, the fuse body 202 is axially and radially detached completely from the fuse ring 204. The rupture of the mechanical fuse 200 and the detachment of the fuse body 202 by compared to the fuse ring 204 releases the rotation between the arm 9a, 9b and the transmission shaft 70. The arm 9a, 9b thus turns empty and no longer runs the risk of driving the motor MA, MB or the control device. transmission 8a, 8b and damage them.

Breaking the connection bridges 211, 212, 213 also allows free rotation of the MA, MB motor without driving the arm 9a, 9b, or vice versa, but while maintaining a connection between the arm 9a, 9b and the transmission shaft 70, in particular thanks to the washer 71. This prevents one end of the arm 9a, 9b from being free and the arm from striking into 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 transmission shaft 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 outside the circle C70 in which the transmission shaft 70 is circumscribed. Indeed, it is preferable that the rupture zone is located in a zone remote from the hexagonal connection to avoid a deformation of the latter and a play between the transmission shaft 70 and the fuse ring 204. This also prevents damage to the driveshaft during movements of the arm or driveshaft after breaking.

The rounded end of the oblong holes 221, 222, 223 form connecting bridges the edges of which do not have a break in slope. 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 efforts of breaking these bridges. A break in slope would weaken the bridge without this fragility being able to be well controlled. In the example of figure 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 tensile strength. 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 of the order of 3.5 mm away from the end, which makes it possible to improve 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 resistance, by finishing processes, such as tribofinishing or brushing, during the making oblong holes 221, 222, 223 and connecting 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 200th of the fuse body 202 and an inner edge 204i of the fuse ring 204. The middle rupture circle passes through the mechanical rupture zones 231, 232, 233, located 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-force leading to the breaking of the mechanical fuse 200, 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 manufacturing and assembly to be simplified. 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 in fact important for the mechanical fuse 200 to exhibit 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-force causing the mechanical fuse 200 to break, only the mechanical fuse 200 needs to 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 tensile steel, a material for which failure occurs quickly after the onset of plastic deformation. Conversely, the material chosen for the transmission shaft is as strong as possible: for example heat-treated steel. The mechanical fuse 200 can be produced by molding, machining, stamping, or other methods of obtaining. In particular, the mechanical fuse can be produced by laser cutting: the laser-cut shape, for example, makes it possible to produce the oblong holes with a chosen section. The laser cuts are made in such a way as to limit the heating at the level of the ends of the oblong holes by a passage of the laser beam in a short period of time.

The drive assembly can be suspended from a lintel above an opening, a member for holding the arm 9a, 9b on the transmission shaft must be provided, which retains the axial assembly between the arm 9a, 9b and the transmission shaft 70 including in the event of failure of the mechanical fuse 200. This retaining 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 fuse body 202 and the arm 9a, 9b to prevent the latter from "falling" from the transmission axis by gravity after the breaking of the connection bridges 211, 212, 213. When mounting 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 the transmission shaft 70, opposite the end of the transmission shaft 70, at the level of 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 'at its outer periphery e. 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 an 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 terms of mechanical resistance to the breaking of the connection bridges 211, 212, 213, that is to say the value of the breaking torque C2. This value would then in fact be dependent on the tightening torque, the latter being random).

In the case where there is a controlled radial clearance between the mechanical fuse 200 and the transmission shaft 70, this must be taken up when reaching the stop in normal operation. When stopping in an intermediate position, the presence of the washer 71, or an equivalent Belleville washer, exerting an axial force clamping the arm 9a, 9b and the transmission shaft 70 makes it possible to generate a 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 such as 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 supporting the materials of a wall above an opening in a building. It is in the same way applicable to the fixing of the frame elements in the lower 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 an opening. side upright of the opening. The terms lintel, threshold or side upright all correspond to an architectural element of an opening.

Claims (10)

1. Swinging shutter (5) motor assembly (10) consisting of at least a first electromechanical module (M1), the first electromechanical module (M1) consisting of at least a first electric motor (MA), the motorisation unit consisting of at least one mechanical connection (MC) consisting of a first part (MC1) and a second part (MC2), the mechanical connection (MC) consisting of

   - a mechanical transmission device (8a, 8b),

   - a drive shaft (70) as output of the mechanical transmission device (8a, 8b),

   - an arm (9a, 9b),

   the first electric motor (MA) being designed so as to be connected, in an assembled configuration of the motorisation unit, via the mechanical connection (MC) to one leaf (5a, 5b) of the shutter (5) in order to move the leaf (5a, 5b) when the first
   electric motor (MA) is activated, characterised in that the mechanical connection (MC) comprises also a mechanical fuse (200), the mechanical fuse (200) comprising a fuse body (202), connected to the first part (MC1) of the mechanical connection (MC) and a fuse ring (204) connected to the second part (MC2) of the mechanical connection, the fuse body (202) and the fuse ring (204) being connected together by
   at least one breakable connection bridge (211, 212, 213), the connection bridge (211, 212, 213) being breakable when subjected to a stress in excess of a predetermined stress value (C2).
2. Motorisation unit (10) according to claim 1, characterised in that the arm (9a, 9b) is fixed to the fuse body (202) and the fuse ring (204) and is fixed in rotation with the drive shaft (70).
3. Motorisation unit (10) according to one of the above claims, characterised in that it comprises a washer (71) and a fixing screw (72) which secures the arm (9a, 9b) and the mechanical fuse (200) onto the drive shaft (70), the washer comprising an outer diameter greater than the inner diameter of the fuse body (202).
4. Motorisation unit (10) according to one of the above claims, characterised in that the fuse ring (204) comprises a polygonal central opening (2040),
   in particular hexagonal, cooperating with the drive shaft (70) having a corresponding outer shape.
5. Motorisation unit (10) according to one of the above claims, characterised in that the fuse body (202) and the fuse ring (204) are separated by at least one oblong hole (221, 222, 223) with an inner curvature along an outside edge (204e) of the fuse ring (204) and an outer curvature along an inner edge (202i) of the fuse body (292).
6. Motorisation unit (10) according to the previous claim, characterised in that the oblong hole (221, 222, 223) has a substantially regular width except at its ends, at which point this width is gradually reduced, the ends of the oblong hole (221, 222, 223) being rounded.
7. Motorisation unit (10) according to the previous claim, characterised in that the connection bridge (211, 212, 213) comprises a mechanical breakage area (231, 232, 233), this mechanical breakage area being located at the smaller width of the connection bridge (211, 212, 213).
8. Motorisation unit (10) according to one of the previous claims, characterised in that the number of connections bridge (211, 212, 213) is greater or equal to two, the connection bridges (211, 212, 213) being evenly distributed between the fuse body
   (202) and the fuse ring (204).
9. Motorisation unit (10) according to one of the above claims, characterised in that it comprises an electronic control unit (20), the control unit (20) comprising electronic surveillance means (DBE), in particular means for detecting a limit stop stress, intended to stop the electric motor (MA) if the stresses detected at the electric motor (MA) or on the mechanical connection (MC) exceed a predetermined threshold (C1).
10. Home automation installation (100) consisting of at least one swinging shutter (5) and a motorisation
    unit (10) according to one or other of the above claims, assembled to the swinging shutter (5).

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