阅读说明：本技术 机电致动器和包括这种致动器的住宅自动化设备 (Electromechanical actuator and home automation device comprising such an actuator ) 是由 M·索恩兹尼 于 2018-11-16 设计创作，主要内容包括：一种机电致动器,包括弹簧制动器(15),其包括螺旋弹簧(22)、鼓筒(23)、输入构件(24)、输出构件(25)及罩盖(33)。鼓筒(23)包括座腔(26),其包括构造成与弹簧(22)的至少一个簧圈配合的摩擦内表面(27)。输入构件(24)包括在输入构件(24)和罩盖(33)之间延伸的驱动齿(31)。输入构件(24)或罩盖(33)包括在输入构件(24)和罩盖(33)之间延伸的间隔件(34)。输入构件(24)包括沿弹簧制动器(15)第一侧(C1)在齿(31)和间隔件(34)之间延伸的用于弹簧(22)的第一径向保持件(54)。罩盖(33)还包括沿弹簧制动器(15)第二侧(C2)在齿(31)与间隔件(34)之间延伸的用于弹簧(22)的第二径向保持件。(An electromechanical actuator includes a spring brake (15) including a coil spring (22), a drum (23), an input member (24), an output member (25), and a cover (33). The drum (23) includes a housing (26) including an inner friction surface (27) configured to engage at least one coil of the spring (22). The input member (24) includes drive teeth (31) extending between the input member (24) and a cover (33). The input member (24) or the cover (33) includes a spacer (34) extending between the input member (24) and the cover (33). The input member (24) includes a first radial retainer (54) for the spring (22) extending along a first side (C1) of the spring brake (15) between the teeth (31) and the spacer (34). The cover (33) also comprises a second radial retainer for the spring (22) extending along the second side (C2) of the spring brake (15) between the teeth (31) and the spacer (34).)

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

the electromechanical actuator (11) comprises at least:

-an electric motor (12),

-a reduction gear (14), and

-a spring brake (15),

the spring brake (15) comprises at least:

-a helical spring (22),

-a drum (23), the drum (23) comprising a seat (26), the seat (26) of the drum (23) comprising an inner friction surface (27) configured to cooperate with at least one coil of a helical spring (22),

-an input member (24),

-an output member (25), and

-a cover (33),

the input member (24) includes a drive tooth (31), the drive tooth (31) extending between the input member (24) and the cover (33) in the assembled configuration of the spring brake (15), and

the input member (24) or the cover (33) comprises 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 retainer (54) for radially retaining the helical spring (22), the first radial retainer extending along a first side (C1) of the spring brake (15) between the drive tooth (31) and the spacer (34) in the assembled configuration of the spring brake (15);

and, the cover (33) comprises a second radial retainer (55) for radially retaining the helical spring (22), the second radial retainer extending between the drive 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 to the first side (C1) of the spring brake (15) with respect to the rotation axis (X) of the spring brake (15).

2. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to claim 1, characterized in that the first radial holder (54) and the second radial holder (55) respectively comprise a rib which extends partially between the input member (24) and the cover (33) in the direction of the rotation axis (X) in the assembled configuration of the spring brake (15).

3. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to claim 1 or 2, characterized in that the outer surface (46) of the first radial holder (54) and the outer surface (47) of the second radial holder (55) are configured to cooperate with at least one coil of the helical spring (22).

4. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to any one of claims 1 to 3, characterized in that:

-the helical spring (22) is formed by a filament (48),

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

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

-each of the first (29a) and second (29b) tabs extends radially towards the inside of the helical spring (22) with respect to the rotation axis (X).

5. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to claim 4, characterized in that in the assembled configuration of the spring brake (15), the first pawl (29a) of the helical spring (22) is configured to cooperate with the first surface (38a) of the drive tooth (31) of the input member (24); and the second pawl (29b) of the coil spring (22) is configured to engage a second surface (38b) of the drive tooth (31) of the input member (24), the second surface (38b) of the drive tooth (31) being opposite the first surface (38a) of the drive tooth (31).

6. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to claim 5, characterized in that in the assembled configuration of the spring brake (15), the first pawl (29a) of the helical spring (22) is arranged between the first surface (38a) of the drive tooth (31) of the input member (24) and the spacer (34); and, the second pawl (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).

7. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to any one of claims 4 to 6, characterized in that:

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

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

-in the assembled configuration of the spring brake (15), the first tab (29a) of the helical spring (22) extends along the second disc table (32) of the cover (33), and the second tab (29b) of the helical spring (22) extends along the first disc table (30) of the input member (24).

8. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to any one of claims 1 to 7, characterized in that in the assembled configuration of the spring brake (15), the input member (24) and the cover (33) remain fixedly connected to rotate about the rotation axis (X).

9. The electromechanical actuator (11) for home automation equipment for closing or shading sun according to claim 8, characterized in that the input member (24) and the cover (33) are fastened to each other by means of fasteners (52a, 52 b); and the fasteners (52a, 52b) of the input member (24) and the cover (33) are resilient snap-in fasteners arranged at the drive teeth (31) and at the spacer (34).

10. A home automation device for closing or shading sun, comprising a screen (2) which can be wound on a roller tube (4) driven in rotation by an electromechanical actuator (11), characterized in that the electromechanical actuator (11) is an electromechanical actuator (11) according to any of claims 1 to 9.

Technical Field

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

The invention also relates to a home automation device for closing or shading the sun, comprising a screen which can be wound on a roller tube driven in rotation by such an electromechanical actuator.

The present invention relates generally to the field of screening devices comprising an electric drive which moves a screen between at least one first position and at least one second position.

The electric drive has an electromechanical actuator for a moving part for closing, shading or shading, such as a blind, a door, a fence, a blind or any other equivalent, hereinafter referred to as screen.

Background

Document FR 2995001 a1 is known, which describes an electromechanical actuator for a home automation device for closing or shading the sun. The electromechanical actuator includes a motor, a reduction gear, 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 lug extending radially with respect to the rotational axis of the spring brake. The drum includes a cylindrical housing. In addition, the inner friction surface of the drum pocket is configured to engage at least one coil of the coil spring. In this way, at least one coil of the helical spring is radially constrained by the drum seat cavity.

The input member includes drive teeth. In the assembled configuration of the spring brake, the drive teeth extend between the input member and the cover. Further, the input member or the cover includes a spacer. In the assembled configuration of the spring brake, the spacer extends between the input member and the cover.

The output member includes two lugs.

The input member is rotated by a motor. The drive tooth of the input member is configured to engage one of the pawls of the coil spring to rotate the coil spring in a first rotational direction about the rotational axis of the spring brake. This movement releases the spring brake. When the coil spring is driven to rotate in the first rotational direction, the friction between the coils of the coil spring and the inner surface of the drum seat cavity is reduced. In other words, this movement tends to reduce the diameter of the outer envelope surface of the helical spring and therefore the radial stress between the helical spring and the inner surface of the drum housing.

One of the lugs of the output member is configured to engage one of the pawls of the coil spring to rotate the coil spring about the rotational axis of the spring brake in a second rotational direction, the second rotational direction being opposite the first rotational direction. This movement actuates the spring brake. When the coil spring is driven to rotate in the second rotational direction, the friction between the coils of the coil spring and the inner surface of the drum seat cavity increases. In other words, this movement tends to increase the diameter of the outer envelope surface of the helical spring and therefore the radial stress between the helical spring and the inner surface of the drum seat cavity.

However, disadvantages of the electromechanical actuator are the generation of operational noise and manufacturing defects associated with misalignment of the coil spring relative to the input member, the output member and the cover. This misalignment can create unnecessary friction between these elements of the spring brake.

Therefore, in order to limit unnecessary friction, these elements of the spring brake must be dimensioned, in particular the drive teeth of the input member, the spacer and the lugs of the output member must be reduced in size, since they may create risks in terms of the quality of the spring brake and thus of the electromechanical actuator.

Furthermore, the coil spring lacks radial retention with respect to the input member, the output member, and the cover during manufacture of the electromechanical actuator.

Thus, when assembling the assembly formed by the input member, the helical spring, the output member and the cover inside the drum, more particularly when operating around the helical spring, the helical spring is positioned obliquely inside the drum seat cavity.

Furthermore, when the assembly formed by the input member, the helical spring, the output member and the cover is assembled inside the drum, the helical spring rubs on the inner friction surface of the drum seat and at least partially removes the lubricant deposited on this inner friction surface and the helical spring.

Disclosure of Invention

The present invention aims to solve the above drawbacks and proposes an electromechanical actuator of a home automation device for closing or shading, comprising a spring brake, and a home automation device for closing or shading, comprising such an electromechanical actuator, in order to ensure the radial retention of the helical spring with respect to the input member, the output member and the cover, both at the time of manufacture of the spring brake and at the time of operation of the spring brake, and to reduce the operating noise of the spring brake when driving the input member and/or the output member to rotate inside the drum seat cavity.

To this end, according to a first aspect, the invention relates to an electromechanical actuator for a home automation device for closing or shading sun,

the electromechanical actuator comprises at least:

-a motor for driving the motor,

-a reduction gear, and

-a spring brake for braking the motor vehicle,

the spring brake comprises at least:

-a helical spring having a helical portion,

-a drum comprising a seat, the seat of the drum comprising a friction inner surface configured to cooperate with at least one coil of a helical spring,

-an input member for receiving a force from a user,

-an output member, and

-a cover lid,

the input member includes a drive tooth extending between the input member and the cover in an assembled configuration of the spring brake, an

The input member or the cover includes a spacer that extends between the input member and the cover in an assembled configuration of the spring brake.

According to the invention, the input member comprises a first radial holder for radially holding the helical spring, the first radial holder extending between the drive tooth and the spacer along a first side of the spring brake in the assembled configuration of the spring brake. Furthermore, the cover comprises a second radial holder for radially holding the helical spring, the second radial holder extending between the drive tooth and the spacer along a second side of the spring brake in the assembled configuration of the spring brake, the second side of the spring brake being opposite the first side of the spring brake with respect to the rotational axis of the spring brake.

Thus, the first and second radial retainers of the input member and of the cover, respectively, extending between the drive teeth and the spacer, allow to ensure the radial retention of the helical spring with respect to the input member, the output member and the cover when the spring brake is manufactured and when the spring brake is operating, and to reduce the operating noise of the spring brake when the input member and/or the output member is driven in rotation in the drum seat cavity.

In this way, the first and second radial holders of the input member and of the cover, respectively, extending between the drive teeth and the spacer, allow to avoid the manufacturing drawbacks linked to the misalignment of the helical spring with respect to the input member, the output member and the cover.

Thus, the first and second radial holders of the input member and of the cover, respectively, extending between the drive teeth and the spacer, allow to ensure the positioning of the helical spring within the drum seat cavity when assembling the spring brake, and in particular when the helical spring winding operation.

Furthermore, when assembling the spring brake, the first and second radial retainers of the input member and of the cover, respectively, extending between the drive tooth and the spacer, allow to limit the friction of the helical spring on the inner friction surface of the drum seat, thus allowing to avoid the removal of at least part of the lubricant deposited on this inner friction surface and on the helical spring.

According to an advantageous feature of the invention, the first radial holder and the second radial holder each comprise a rib which, in the assembled configuration of the spring brake, extends partially between the input member and the cover in the direction of the axis of rotation.

According to another advantageous feature of the invention, the outer surface of the first radial holder and the outer surface of the second radial holder are configured to cooperate with at least one coil of a helical spring.

According to another advantageous feature of the invention, the helical spring is formed by a filament. The first end of the coil spring forms a first tab. The second end of the coil spring forms a second tab. Further, each of the first and second pawls extends radially inward of the coil spring with respect to the rotational axis.

According to another advantageous feature of the invention, in the assembled configuration of the spring brake, the first pawl of the helical spring is configured to cooperate with a first surface of the drive tooth of the input member; and, the second pawl of the coil spring is configured to engage 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 feature of the invention, in the assembled configuration of the spring brake, the first pawl of the helical spring is arranged between the first surface of the drive tooth of the input member and the spacer. In addition, a second pawl of the coil spring is disposed between the second surface of the drive tooth of the input member and the spacer.

According to another advantageous feature of the invention, the input member comprises a first disc table. The cover includes a second tray table. Further, in the assembled configuration of the spring brake, the first tab of the coil spring extends along the second land of the cover and the second tab of the coil spring extends along the first land of the input member.

According to another advantageous feature of the invention, in the assembled configuration of the spring brake, the input member and the cover remain fixedly connected for rotation about the axis of rotation.

According to another advantageous feature of the invention, the input member and the cover are fastened to each other by means of fasteners. Further, the fasteners of the input member and the cover are resilient snap-in fasteners disposed at the drive teeth and at the spacer.

According to a second aspect, the invention also relates to a home automation device for closing or shading sun, comprising a screen that can be wound on a roller tube driven in rotation by an electromechanical actuator according to the invention:

the home automation device has similar features and advantages to those described above in relation to the electromechanical actuator according to the invention.

Drawings

Additional features and advantages of the invention will be set forth in the description which follows.

In the accompanying drawings, which are given by way of non-limiting example:

figure 1 is a cross-sectional schematic view of a home automation device according to an embodiment of the invention;

figure 2 is a schematic perspective view of the home automation device shown in figure 1;

figure 3 is a schematic partial section of the home automation device shown in figure 2 at the electromechanical actuator;

figure 4 is an exploded perspective schematic view of the spring brake of the electromechanical actuator shown in figure 3;

fig. 5 is a schematic perspective view of the spring brake shown in fig. 4, with the drum of the spring brake omitted;

fig. 6 is a first schematic sectional view of the spring brake shown in fig. 4 and 5 before the input member, the output member and the helical spring are inserted into the drum;

fig. 7 is a second schematic sectional view of the spring brake shown in fig. 4 to 6, after the input member, the output member and the helical spring have been inserted into the drum, with the drum of the spring brake omitted;

fig. 8 is a schematic perspective view of an input member of the spring brake shown in fig. 4 to 7; and

fig. 9 is a schematic perspective view of the cover of the spring brake shown in fig. 4 to 7.

Detailed Description

First, with reference to fig. 1 and 2, a home automation device according to the invention is described, installed in a building having an opening 1 (window or door) equipped with a screen 2 belonging to a screening device 3, in particular a motorized roller shutter.

The screening arrangement 3 may be a roller blind as shown in fig. 1 and 2, a canvas blind or a blind with adjustable slats, or a roller shutter door. The invention is applicable to all types of screening devices.

A roll blind according to an embodiment of the present invention will be described with reference to fig. 1 and 2.

The screen 2 of the shade device 3 is wound around a roller tube 4 driven by an electric drive device 5 and is movable between a winding position, particularly an upper winding position, and a deployed position, particularly a lower deployed position.

The movable screen 2 of the screening arrangement 3 is a screen for closing, hiding and/or shading, which is wound on a roller tube 4, the inner diameter of which is typically larger than the outer diameter of the electromechanical actuator 11, so that the electromechanical actuator 11 can be inserted into the roller tube 4 during assembly of the screening arrangement 3.

The electric drive 5 has an electromechanical actuator 11, in particular of the tubular type, which can drive the roller tube 4 in rotation for unrolling or rolling up the screen 2 of the screening device 3.

The screening arrangement 3 comprises a roller tube 4 for winding the screen 2. In the mounted state, the electromechanical actuator 11 is inserted in the roller tube 4.

As is known, the roller shutter forming the screening device 3 has a shutter with horizontal slats hinged to each other so as to form the screen 2 of the roller shutter 3 and guided by two side rails 6. These slats engage when the blind 2 of the roller blind 3 reaches its lower, deployed position.

In the case of a roller blind, the upper, rolled-up position corresponds to the final end slat 8, for example in the form of L, of the blind 2 of the roller blind 3 resting on the edge of the box 9 of the roller blind 3, or to the final end slat 8 resting at the programmed upper end-of-travel position, and, in addition, the lower, unrolled position corresponds to the final end slat 8 of the blind 2 of the roller blind 3 resting on the threshold 7 of the opening 1 or the final end slat 8 resting at the programmed lower end-of-travel position.

The first slat of the blind 2 of the roller blind 3, opposite the last end slat 8, is connected to the roller tube 4 by means of at least one hinge 10, in particular a strip-shaped fastening.

The roller tube 4 is positioned within the box 9 of the roller shutter 3. The blind 2 of the roller blind 3 is wound and unwound around the roller tube 4, housed at least partially inside the box 9.

Typically, the tank 9 is positioned above the opening 1 or in the upper part of the opening 1.

The electric drive 5 is controlled by a control unit. The control unit may be, for example, a local control unit 41, wherein the local control unit 41 may be in wired or wireless connection with a central control unit 42. The central control unit 42 may operate the local control unit 41 as well as other similar local control units distributed throughout the building.

The central control unit 42 may be in communication with weather stations located outside the building, in particular having one or more sensors which may be configured to determine, for example, temperature, brightness or wind speed.

The remote control 43 may be a local control unit provided with a control keyboard having selection and display means, and allowing the user to operate the electromechanical actuators 11, the local control units 41 and/or the central control unit 42.

The electric drive 5 is preferably configured to execute commands for unrolling or rolling up the screen 2 of the screening device 3, which commands may in particular be issued by a remote control 43.

The electromechanical actuator 11 belonging to the home automation device of fig. 1 and 2 will now be described in more detail with reference to fig. 3.

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

The motor 12 comprises a rotor and a stator, not shown, which are positioned coaxially around the rotation axis X, which is also the rotation axis of the roller tube 4 in the assembled configuration of the electric drive 5.

The control device for controlling the electromechanical actuator 11 to move the screen 2 of the screening device 3 has at least an electronic control unit 44. The electronic control unit 44 is able to operate the electric motor 12 of the electromechanical actuator 11, in particular to supply the electric motor 12 with electric power.

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

The electronic control unit 44 also has an instruction receiving module, in particular for receiving radio instructions sent by an instruction transmitter, for example a remote control 43, which remote control 43 is used to control the electromechanical actuators 11 or one of the local control units 41 and the central control unit 42.

The command receiving module can also allow receiving commands sent by a wired device.

Here, as shown in fig. 3, the electronic control unit 44 is disposed inside the housing 13 of the electromechanical actuator 11.

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

As a non-limiting example, the hardware device may include at least one microcontroller.

The electromechanical actuator 11 is powered by the mains electricity distribution network, or using a battery, which may be charged, for example, by a photovoltaic cell panel. The electromechanical actuator 11 may move the shield 2 of the screening device 3.

Here, the electromechanical actuator 11 has a power supply line 21, allowing it to be supplied from the mains electricity distribution network.

The housing 13 of the electromechanical actuator 11 is preferably cylindrical.

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

The material of the electromechanical actuator housing is non-limiting and may be different. The material may in particular be a plastic material.

The roller tube 4 is driven in rotation about the rotation axis X and the housing 13 of the electromechanical actuator 11 supported by two pivot connections. A first pivotal connection is formed at a first end of the roller tube 4 by a circular crown 18 which surrounds and is inserted at an end 13a of the housing 13 of the electromechanical actuator 11. Thus, the ring crown 18 may form a bearing. A second pivotal connection, not shown in fig. 3, is formed at the second end of the roller tube 4.

The electromechanical actuator 11 comprises a moment support 19. The torque support 19 projects at the end 13a of the housing 13 of the electromechanical actuator 11, in particular at the end 13a of the housing 13 which receives the crown 18. The moment support 19 of the electromechanical actuator 11 therefore allows the electromechanical actuator 11 to be fixed on the frame 20, in particular to a side of the box 9.

Furthermore, the moment support 19 of the electromechanical actuator 11 may allow closing the end 13a of the housing 13.

Furthermore, the torque support 19 of the electromechanical actuator 11 may allow supporting the electronic control unit 44. The electronic control unit 44 may be powered by the power cord 21, which is electrically connected to the mains supply network, or by a battery.

The reduction gear 14 comprises at least one reduction stage. The at least one reduction stage may be a planetary type gear train.

The number and type of reduction stages of the reduction gear 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 housing 13 of the electromechanical actuator 11, in particular with respect to an end 13b of the housing 13 opposite to the end 13 a.

The output shaft 16 of the electromechanical actuator 11 is configured to drive in rotation a coupling 17 connected to the roller tube 4. The connecting member 17 is made in the shape of a wheel.

When the electromechanical actuator 11 is operated, the motor 12 and the reduction gear 14 drive the output shaft 16 to rotate. Furthermore, the output shaft 16 of the electromechanical actuator 11 drives the roller tube 4 in rotation via a coupling 17. Thus, the roller tube 4 drives the shutter 2 of the shielding device 3 to rotate so as to open or close the opening 1.

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

In the embodiment shown in fig. 3, the spring brake 15 is arranged between the motor 12 and the reduction gear 14, i.e. at the output of the motor 12.

In another embodiment, not shown, in which the reduction gear 14 comprises a plurality of reduction stages, the spring brake 15 is arranged between two reduction stages of the reduction gear 14.

In another embodiment, not shown, a spring brake 15 is arranged at the output end of the reduction gear 14.

The electromechanical actuator 11 may also comprise end-of-stroke and/or obstacle detection means, which may be mechanical or electronic.

The spring brake 15 of the electromechanical actuator 11 shown in fig. 3 and according to an embodiment of the invention will now be described with reference to fig. 4 to 9.

The spring brake 15 comprises at least one helical 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 housing 13 of the electromechanical actuator 11, in particular by means of a recess 28 provided on the outer periphery of the drum 23, the recess 28 being configured to cooperate with a tongue, not shown, of the housing of the reduction gear 14.

Furthermore, the housing of the reduction gear 14 is held in a housing 13 located in the electromechanical actuator 11.

The drum 23 has a housing 26.

Here, the housing 26 of the drum 23 is cylindrical. In addition, the housing 26 of the drum 23 is a through housing.

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

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

Advantageously, the helical spring 22 comprises a plurality of coils. When the spring brake 15 is assembled and then installed in the electromechanical actuator 11, the coils of the helical spring 22 are centered on an axis coinciding with the rotation axis X.

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

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

The pocket 26 of the drum 23 includes an inner friction surface 27, the inner friction surface 27 being configured to engage at least one coil of the coil spring 22.

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

Here, as shown in fig. 7, the coil spring 22 is tightly held in the housing 26 of the drum 23 so that the coil spring 22 is fixed to the drum 23 by friction when the coil spring 22 stops.

Advantageously, the helical spring 22 is formed by a filament 48. A first end of the coil spring 22 forms a first tab 29 a. The second end of the coil spring 22 forms a second tab 29 b. Furthermore, each of the first and second tabs 29a, 29b extends radially with respect to the rotation axis X and towards the inside of the helical spring 22.

The helical spring 22 thus comprises two claws 29a, 29b, only one of which is visible in fig. 4.

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

In a variant not shown, in the assembled configuration of the spring brake 15, each of the prongs 29a, 29b of the helical spring 22 extends axially with respect to the rotation axis X.

In this exemplary embodiment, the claws 29a, 29b of the coil spring 22 extend radially with respect to the rotation axis X and inward of the coil spring 22, particularly from the coils of the coil spring 22 toward the central axis direction of the coil spring 22, as shown in fig. 4.

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

Such movement releases the spring brake 15.

When the helical spring 22 is driven in rotation in the first direction of rotation, the friction between at least one coil of the helical spring 22 and the inner surface 27 of the housing 26 of the drum 23 is reduced.

In other words, this movement tends to reduce the diameter of the outer envelope surface of the helical spring 22 and therefore the radial stress between the helical spring 22 and the inner surface 27 of the housing 26 of the drum 23.

In this way, motion generated by the motor 12 may be transferred from the input member 24 to the output member 25.

The outer envelope surface of the helical spring 22 is defined by the outer generatrices of the coils of the helical spring 22.

Advantageously, the output member 25 comprises two lugs 39, as shown in fig. 4, 6 and 7. In the assembled configuration of the spring brake 15, the lug 39 of the output member 25 is configured to be inserted inside the helical spring 22.

Preferably, each lug 39 of the output member 25 includes a notch 40. The notch 40 of each lug 39 of the output member 25 is configured to mate with one of the claws 29a, 29b of the coil spring 22.

The output member 25, in particular one of the lugs 39, is configured to cooperate with at least one of the claws 29a, 29b of the helical spring 22 to drive the helical spring 22 in rotation about the rotation axis X in the second rotation direction. The second rotational direction is opposite to the first rotational direction.

Such movement actuates the spring brake 15, which tends to prevent or slow the rotation of the helical spring 22 in the housing 26 of the rotating drum 23.

When the helical spring 22 is driven in rotation in the second direction of rotation, the friction between at least one coil of the helical spring 22 and the inner surface 27 of the housing 26 of the drum 23 increases.

In other words, this movement tends to increase the diameter of the outer envelope surface of the helical spring 22, in particular by bringing the claws 29a, 29b of the helical spring 22 closer together, so as to increase the radial stress between the helical spring 22 and the inner surface 27 of the housing 26 of the drum 23.

Advantageously, the spring brake 15 comprises a lubricant, not shown, arranged between the helical spring 22 and the inner 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 the assembled configuration of the electromechanical actuator 11.

Here, as shown in fig. 4 and 8, the input member 24 includes a socket 50. The socket 50 of the input member 24 is configured to mate with the shaft 37 of the output member 25.

In this manner, the shaft 37 of the output member 25 allows for the receipt and transmission of torque from the motor 12.

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

In this way, the shaft 37 of the output member 25 allows torque from the motor 12 to be received by the socket 50 of the input member 24 and the shaft 37 of the output member 25 and transmitted to the reduction gear 14.

In the assembled configuration of the electromechanical actuator 11, the shaft 37 of the output member 25 is centred on the rotation axis X.

In the exemplary embodiment, the socket 50 of the input member 24 is made by boring, is disposed in the center of the input member 24, and more particularly is centered on the axis of rotation X in the assembled configuration of the spring brake 15. Further, the output member 25 includes a pin 51 arranged in alignment with the shaft 37. Thus, the pin 51 of the output member 25 is also centered on 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 socket 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 socket 50 of the input member 24 and the pin 51 of the output member 25.

Advantageously, the cover 33 comprises an opening 53. Further, the opening 53 of the cover 33 is a through opening. The opening 53 of the cover 33 is configured to mate with the shaft 37 of the input member 25.

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

As shown in fig. 4 and 6-8, the input member 24 includes drive teeth 31. In the assembled configuration of the spring brake 15, the drive teeth 31 extend between the input member 24 and the cover 33.

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

Preferably, the input member 24 includes a first disk table 30. Further, the cover 33 includes the second tray stage 32.

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

Here, the first tray table 30 includes a drive tooth 31.

Advantageously, in the assembled configuration of the spring brake 15, the first pawl 29a of the coil spring 22 is configured to engage the first surface 38a of the drive tooth 31 of the input member 24 and the second pawl 29b of the coil spring 22 is configured to engage the second surface 38b of the drive tooth 31 of the input member 24. Second surface 38b of drive tooth 31 is opposite first surface 38a of drive tooth 31.

In this way, the driving tooth 31 of the input member 24 is arranged between the two pawls 29a, 29b of the helical spring 22, configured to cooperate with one or the other of the pawls 29a, 29b of the helical spring 22, depending on the direction of rotation generated by the motor 12, as shown in fig. 6 and 7.

Thus, the drive tooth 31 of the input member 24 includes two drive faces 38a, 38 b. Each drive surface 38a, 38b of drive tooth 31 is configured to engage one of the pawls 29a, 29b of coil spring 22.

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

The input member 24, and more particularly the first disk table 30, includes a spacer 34. In the assembled configuration of the spring brake 15, the spacer 34 extends between the input member 24 and the cover 33.

In this way, the spacer 34 of the input member 24 allows for maintaining axial separation between the input member 24 and the cover 33, and more particularly between the first disk table 30 and the second disk table 32.

Here, the spacer 34 of the input member 24 is disposed diametrically opposite the drive teeth 31 of the input member 24, as shown in fig. 4 and 6-8.

Further, in the exemplary embodiment, drive teeth 31 of input member 24 correspond to another spacer.

In this way, the drive teeth 31 of the input member 24 also allow maintaining the axial separation between the input member 24 and the cover 33, more particularly between the first and second disc stages 30, 32.

In a variant not shown, the cover 33, more specifically the second disk table 32, comprises a spacer 34. In the assembled configuration of the spring brake 15, the spacer 34 extends between the input member 24 and the cover 33.

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

Here and as shown in fig. 4, 5, 8 and 9, first disk table 30 and second disk table 32 include perimeter flange rings 35, 36, respectively. The two peripheral flange rings 35, 36 are arranged opposite each other along the rotation axis X in the assembled configuration of the spring brake 15.

The input member 24 includes a first radial retainer 54 for radially retaining the coil spring 22, the first radial retainer 54 extending between the drive teeth 31 and the spacer 34 along a first side C1 of the spring brake 15 in the assembled configuration of the spring brake 15.

Furthermore, the cover 33 comprises a second radial holder 55 for radially holding the helical spring 22, the second radial holder 55 extending between the drive 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.

Here, the second radial holder 55 of the cover 33 can be seen in fig. 9.

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

Thus, the first radial holder 54 and the second radial holder 55 of the input member 24 and of the cover 33, respectively, extending between the drive teeth 31 and the spacer 34, allow to ensure the radial retention of the helical spring 22 with respect to the input member 24, the output member 25 and the cover 33, both when the spring brake 15 is manufactured and when the spring brake 15 is operating, and to reduce the operating noise of the spring brake 15 when the input member 24 and/or the output member 25 are driven in rotation inside the housing 26 of the drum 23.

In this way, the first and second radial holders 54, 55 of the input member 24 and of the cover 33, respectively, extending between the drive teeth 31 and the spacer 34, allow manufacturing defects associated with misalignment of the helical spring 22 with respect to the input member 24, the output member 25 and the cover 33 to be avoided.

The first and second radial holders 54, 55 of the input member 24 and of the cover 33, respectively, extending between the drive tooth 31 and the spacer 34, therefore allow to ensure the positioning of the helical spring 22 inside the housing 26 of the drum 23 when assembling the spring brake 15, and in particular when the helical spring 22 is wound up.

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

Furthermore, the first and second radial holders 54, 55 of the input member 24 and of the cover 33, respectively, extending between the drive tooth 31 and the spacer 34, allow to limit the friction of the helical spring 22 on the inner friction surface 27 of the housing 26 of the drum 23 when assembling the spring brake 15, thus allowing to avoid the removal of at least part of the lubricant deposited on this inner friction surface 27 and on the helical spring 22.

Furthermore, the design of such a spring brake 15 requires consideration of the angular travel α between one of the claws 29a, 29b of the coil spring 22 (in this case, the second claw 29b of the coil spring 22) and one of the lugs 39 of the output member 25 (in this case, the second lug 39 of the output member 25) to allow the spring brake 15 to operate when the spring brake 15 is released and when the spring brake 15 is actuated, as shown in fig. 7.

This angular travel α allows the angular dimensions of the drive teeth 31 of the input member 24, the spacer 34, and the lugs 39 of the output member 25 to be determined.

The first radial holder 54 of the input member 24 and the second radial holder 55 of the cover 33 allow to limit the value of the angular stroke α, thus allowing to optimize the angular dimensions of the drive teeth 31 of the input member 24, of the spacer 34 and of the lugs 39 of the output member 25, so as to ensure that these parts are robust and durable.

By way of non-limiting example, the value of the angular stroke α may be reduced by approximately 8 ° to 10 °.

The design of such a spring brake 15 also requires consideration of the outer diameter of the output member 25 in order to limit the operational noise of the spring brake 15 associated with friction between at least one coil of the coil spring 22 and the outer surface 45 of the output member 25, and more particularly the lug 39 of the output member 25.

The first and second radial holders 54, 55 of the input member 24 and of the cover 33, respectively, allow to avoid friction of at least one coil of the helical spring 22 with the outer surface 45 of the output member 25, thus optimizing the outer diameter of the output member 25. The outer diameter of the output member 25 is defined by a circle passing through the outer surface 45 of each lug 39 of the output member 25.

The first and second radial holders 54, 55 of the input member 24 and of the cover 33, respectively, allow to ensure the radial retention of the helical spring 22 with respect to the input member 24, the output member 25 and the cover 33, both when manufacturing the spring brake 15 and when operating the spring brake 15.

In this way, the lubrication of the spring brake 15, and in particular of the contact area between the helical spring 22 and the inner 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 rotation axis X.

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

Referring to fig. 4, the first side C1 of the spring brake 15 is located to the right of the rotation axis X. Furthermore, the second side C2 of the spring brake 15 is located to the left of the rotation axis X.

Advantageously, the first radial holder 54 and the second radial holder 55 respectively comprise ribs which, in the assembled configuration of the spring brake 15, extend partially between the input member 24 and the cover 33 in the direction of the rotation axis X.

Thus, the radial retention of the helical spring 15 with respect to the input member 24, the output member 25 and the cover 33 is performed along the axial direction of the spring brake 15, more particularly along the rotation axis X, to ensure the alignment of the members 22, 24, 25, 33 of the spring brake 15.

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

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

Here, the radial retention of the coil spring 15 with respect to the input member 24, the output member 25 and the cover 33 is achieved by at least one first coil of the coil spring 22 abutting against the outer surface of the input member 24 and by at least one second coil of the coil spring 22 abutting against the outer surface of the cover 33.

Advantageously, in the assembled configuration of the spring brake 15, the first pawl 29a of the helical spring 22 is arranged between the first surface 38a of the drive tooth 31 of the input member 24 and the spacer 34. Further, the second pawl 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, in the assembled configuration of the spring brake 15, the input member 24 and the cover 33, more particularly the first and second disk table 30, 32, remain fixedly connected to rotate about the rotation axis X.

Here, the input member 24 and the cover 33 are fastened to each other by the fasteners 52a, 52 b.

Advantageously, the fasteners 52a, 52b of the input member 24 and the cover 33 are resilient snap-in fasteners disposed at the drive teeth 31 and at the spacer 34.

In the exemplary embodiment, the first fastener 52a of the input member 24 is disposed at the drive tooth 31 of the input member 24. Further, the second fastener 52a of the input member 24 is provided at the spacer 34 of the input member 24.

Here, the input member 24 includes two fasteners 52a, and the cover 33 includes two fasteners 52 b.

Referring to fig. 4, only one of the fasteners 52b of the cover 33 is shown.

The number of fasteners of the input member and of the cover is non-limiting and can be different, in particular greater than or equal to three.

As a variant not shown, the input member 24 and the cover 33, more particularly the first and second disk table 30, 32, may be kept fixedly integrated by simple nesting.

The output member 25 is configured to be connected to the shield 2 of the shielding device 3.

Advantageously, the input member 24 and the output member 25 are made of plastic material.

Furthermore, the cover 33 is made of a plastic material.

As a non-limiting example, the plastic material of the input member 24, the output member 25 and the cover 33 may be polybutylene terephthalate, also known as PBT, or polyoxymethylene, also known as POM.

As a variant, the output member 25 can be made of zamac (acronym for the names of the constituent metals of this material: zinc, aluminium, magnesium and copper).

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

Thus, the use of sintered steel for the drum 23 allows to reduce the resistance of the helical spring 22 to the friction of the inner surface 27 of the housing 26 of the drum 23.

Thanks to the invention, the first and second radial holders of the input member and of the cover, respectively extending between the drive teeth and the spacer, allow to ensure the radial retention of the helical spring with respect to the input member, the output member and the cover, both when manufacturing the spring brake and when the spring brake is operating, and to reduce the operating noise of the spring brake when the input member and/or the output member are driven in rotation inside the drum seat cavity.

In this way, the first and second radial holders of the input member and of the cover, respectively, extending between the drive teeth and the spacer, allow to avoid the manufacturing drawbacks linked to the misalignment of the helical spring with respect to the input member, the output member and the cover.

Thus, the first and second radial holders of the input member and of the cover, respectively, extending between the drive teeth and the spacer, allow to ensure the positioning of the helical spring inside the drum seat cavity when assembling the spring brake and in particular when the helical spring is wound up.

Furthermore, when assembling the spring brake, the first and second radial retainers of the input member and of the cover, respectively, extending between the drive tooth and the spacer, allow to limit the friction of the helical spring on the inner friction surface of the drum seat, thus allowing to avoid the removal of at least part of the lubricant deposited on this inner friction surface and on the helical spring.

Many modifications may be made to the above-described embodiments without departing from the scope of the invention, as defined in the claims.

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

Furthermore, the contemplated embodiments and variations may be combined to create new embodiments of the invention without departing from the scope of the invention as defined by the claims.