FR3124835A1 - MULTILAYER SHIELD FOR PENDULUM DAMPING DEVICE - Google Patents

Abstract

MULTILAYER SHIELD FOR A PENDULAR DAMPING DEVICE The invention claims a damping module (1), comprising at least: - a primary flywheel (2) of inertia, intended to receive a drive torque from a drive shaft , and a secondary flywheel (3) of inertia, rotatable relative to each other about an axis (X) of rotation; - a pendular damping device (5B) arranged axially between the primary (2) and secondary (3) inertia flywheels, the pendular damping device (5B) comprising at least one pendular body (55B) mounted in a movable manner on at least one pendular support (53B); and - a multi-layer protection shield (60) against bursting of the pendulum damping device (5B), formed of preassembled layers (61, 62, 63) at least partially surrounding the pendulum damping device (5B), the multilayer protective shield (60) being attached fixedly to a fixed component (C0) of the damping module chosen from among: the primary flywheel (2) of inertia, the secondary flywheel (3) of inertia and the support (53B) pendulum of the device (5B) of pendulum damping. Figure for abstract: FIGURE 2

Description

MULTILAYER SHIELD FOR PENDULUM DAMPING DEVICE

The invention relates to the field of transmissions for mobility devices, the latter being for example a heavy goods vehicle, an agricultural vehicle, a public transport vehicle or even a hybrid vehicle. The invention relates in particular to a damping module, such as a double damped flywheel, further comprising a pendular damping device, capable of filtering the acyclisms of the engine of the mobility device.

It is known to equip a torque transmission chain with a double damping flywheel, comprising primary and secondary inertia flywheels, coaxial and movable with respect to each other, to filter the vibrations due to acyclisms in upstream of the gearbox. The document DE102012200966 discloses this dual mass flywheel, further comprising a centrifugal pendular damping device, formed here of a pendulum support fixedly linked to the flywheels by riveting, and of one or more pendular bodies composed of pendular masses, mounted oscillating and arranged outside on either side of the pendular support, around an axis parallel to the axis of rotation of the support. Vibrations or failures can occur on this pendulum damping device, for example due to the bursting of the pendulum masses.

In order to contain and protect the environment of the pendular damping device, it is known to use a protection against the bursting of the pendular damping device, fixed by welding with added material on the primary flywheel. The current design of such protection is a thick, expensive and massive one-piece shield, generally of the order of 3 to 7 mm thick, produced by machining and stamping, which does not meet the objectives of mass and maximum inertia set by customers. Moreover, its resistance is insufficient to contain the pendulum damping device in centrifugation. Its geometric shape is not assured, being able to be degraded or deformed in the event of shocks. In addition, an external chamfer is required at the end of the shield, for reasons of space related to the gearbox housing, resulting in considerable shrinkage of material, additional manufacturing steps and costs, sometimes also sources of potential errors. or reject.

The aim of the invention is to provide a simple, effective and economical solution to this problem, for example with a new protective shield that is both lightened and resistant, to contain the bursting of the pendular device.

For this purpose, the invention proposes, according to a first aspect, a damping module for a torque transmission, comprising at least:
- a primary flywheel, intended to receive a drive torque from a driving shaft, and a secondary flywheel, movable in rotation with respect to each other around an axis X of spin ;
- A pendulum damping device disposed axially between the primary and secondary flywheels, the pendulum damping device comprising at least one pendulum body movably mounted on at least one pendulum support; And
- a multilayer protection shield against the bursting of the pendular damping device, formed of preassembled layers at least partially surrounding the pendular damping device, the multilayer protective shield being attached fixedly to a fixed component of the chosen damping module among: the primary flywheel, the secondary flywheel and the pendulum support of the pendulum damping device.

Thanks to these characteristics, a protective shield is produced consisting of several layers which, fixedly preassembled, together constitute both reduced mass and inertia, and adequate resistance to contain the bursting of the pendulum device, and in particular of the oscillating mounted pendulum bodies.

Such a multi-layer protective shield composition is then more effective than a solid one-piece shield (present in the prior art), due to a compressive pre-load exerted between its so-called pre-assembled layers, as well as the use of material optimized for each layer.

These preassembled layers can be thinned, without oversizing or complicating the geometry of the damping module parts, while containing the pendulum damping device. In addition, the layers can be distinguished to make them fulfill different functions, for example to constitute, according to the progress of the bursting of the pendulum damping device, a progressive and optimized resistance of the said shield.

Therefore, the resistance of a multi-layer protective shield is equivalent to that of a current one-piece shield, however the advantages are as follows: The weight of a multi-layer protective shield can be reduced up to 20% of the weight a current one-piece shield; The inertia of a multi-layer protection shield can be reduced to represent 13% of the inertia of a one-piece shield. The risks of degradation or deformation are limited. In addition, the manufacture of such a protective shield is simple to achieve, without additional material costs.

This first aspect of the invention may have one or other of the characteristics described below, combined with each other or taken independently of each other:

– The number of layers of the protective shield can be between two and five layers;

– The number of layers of the protective shield can be formed from a maximum of four layers, among which are present: an inner layer, an outer layer and a maximum of two intermediate layers;

– Alternatively, the number of layers of the protective shield may be greater than or equal to five, in order to also consist of a number of intermediate layers greater than or equal to three;

– The protective shield can be made up of two layers pre-assembled on top of each other, including:
- a layer radially closest to the X axis, called inner, defining the inner periphery of the shield, and
- a layer radially farthest from the axis X, called outer layer, defining the outer periphery of the shield;

– Alternatively, the protective shield can be formed of at least three layers pre-assembled on top of each other, including:
- a layer radially closest to the X axis, called inner, defining the inner periphery of the shield,
- a layer radially farthest from the axis X, called outer layer, defining the outer periphery of the shield, and
- an intermediate layer, arranged radially between said inner and outer layers of the shield;

– By outer layer is meant the radially outer layer forming the outer periphery of the protective shield;

– The inner layer means the radially inner one forming the inner periphery of the protective shield.

– The inner layer of the protection shield can be configured in such a way as to be radially spaced from the pendulum damping device by a predefined functional clearance. This functional clearance is then less than a radial distance likely to cause plastic deformation of said inner layer;

– The layers of the protective shield can be assembled together, by press fit;

– The layers of the protective shield can be assembled by shrinking. Hooping is carried out between two layers, the layer located outside is called "hoops", the one located inside is called "hooped";

– Shrinking of layers can be carried out cold (by liquid nitrogen, or dry ice) to contract the inner or shrunk layer, and engage it on the outer part or hoop;

– A hooping of layers can be carried out hot (by induction, gas or oven) to expand the inner layer or hooped, and put it on the outer layer or hooped. This thermal solution is faster, more economical, due to energy savings, having localized heating control, and is easily integrated on assembly lines.

– The layers can be nested one inside the other; to form the protective shield;

– The layers of the protective shield can be assembled together by crimping;

– The layers of the protective shield can be assembled together by clinching;

– The layers of the protective shield can be assembled together by gluing;

– The layers of the protective shield can be assembled together by pins or any other assembly element. The pins can be cylindrical or conical, in order to be stressed in shear;

– The layers of the protective shield can be assembled together by welding.

– The weld can be made at least partially circumferentially around the X axis, for example:
- continuously around the X axis; Or
- by partial welding, via spot welds or weld beads; and or
- By arc or laser welding, by electrical resistance: the two welded layers can then be of different nature and thickness. The two layers are then kept under pressure and placed between two electrodes;

– The layers of the protection shield can be different from each other. One can choose for each layer: a shape, material, surface, volume and/or density adapted, in order to exercise the function for which it is devolved, for example to constitute an optimal and/or progressive resistance to penetration, by different layers;

– The inner and/or outer layer can be circumferentially continuous around the X axis;

– The layers of the protection shield can be cylinders inside which the pendulum damping device is contained at least in part. The cylinders can be continuous over 360 degrees or discontinuous;

– The cylinders can be thinned, for example made from sheet metal and/or by extending material;

– In particular, at least one intermediate layer can be a segmented cylinder, discontinuous around the X axis;

– Preferably, the pendular damping device can be received entirely inside at least one of said layers, in particular inside a single layer, for example an inner layer;

– At least one of the layers of the protective shield can completely surround the pendulum damping device. In particular, a single layer, and in particular the inner layer, can entirely surround the pendular damping device. Alternatively, at least one intermediate layer may entirely contain the pendular damping device. Alternatively, each of the layers of the protective shield can completely surround the pendular damping device;

– The protective shield may comprise a fixing interface intended to be integrally linked to said fixed component of the damping module. The attachment interface may be formed at least in part by:
- all the slices or thicknesses of the layers of the protection shield;
- the axial length of one of the layers of the protective shield, for example over an area extending over 5% to 45% of the length of the inner layer;

– The protective shield, and in particular the layers, may be free of deformations or radial offset;

– The layers of the protective shield can extend axially in line with the fixing interface;

– The layers of the protective shield can extend axially in the extension of the fixing interface;

– The layers of the protective shield can be of different shapes, or alternatively, identical;

– The layers of the protective shield can be for example of continuous form(s) and/or segment(s);

– The layers of the protective shield can be sheets, for example identical or different;

– The layers of the protective shield can be made of the same or different materials.

– The materials of the inner and outer layers can be of different hardnesses or densities;

– In particular, the material of an inner layer may be different from the other pre-assembled layer(s);

– Furthermore, the material of an intermediate layer may be different from the other pre-assembled layer(s);

– In addition, a layer of the protective shield can be made of a metallic or metallic alloy material, or non-metallic (for example a polymer layer), or composite or ceramic;

– In particular, a layer of the protective shield can be made of steel or cast iron. For example, a steel with a high elastic limit, flexible and resistant to wear can be selected, to reduce wear phenomena;

– In particular, another layer of the protective shield can be, for example, copper or aluminum;

– The layers of the protective shield can be of different thicknesses, or else of identical thicknesses;

– The thickness of the outer layer can be greater than that of the inner layer. The ratio of the thickness of the outer layer to the thickness of the inner layer may be less than 3, preferably less than or equal to 2.

– The thickness of at least one intermediate layer may be equal to or less than that of the outer layer;

– Alternatively, the outer and intermediate layers can be of identical thicknesses, in order to standardize and simplify their manufacture. Thus, the use of the same range of tools is possible for their manufacture;

– The axial length known as the height of the protective shield can be less than or equal to the length of the pendulum support. The axial length of the shield is defined by the longest axial length of one of the layers;

– The thickness of the multilayer protection shield can be less than or equal to the thickness of the pendulum support;

– The thickness of the protective shield can be between 0.5 and 5 mm, in order to limit the axial bulk. A layer of the protective shield can be relatively thin, between 0.25 and 2 mm;

– The layers of the protection shield can be of different lengths, or alternatively, identical;

– In particular, the axial length of the inner layer can be greater than that of the outer layer. The axial length of the intermediate layer(s) may be equal to or greater than that of the outer layer;

– At least one of the layers of the protective shield may comprise a beveled or chamfered portion arranged to receive the gearbox housing, the advantage being to reduce its size;

– Alternatively, at least one of the axial ends of the protective shield may comprise a collar or a shoulder, delimited by the inner and outer layers. The loss of material and the bulk are reduced;

– Said collar or shoulder may be delimited by a difference in axial lengths between at least two layers, in particular between the inner and outer layers, these delimiting in particular the end of said protective shield. An empty zone of so-called chamfered material is obtained free of charge, without the obligation of an additional machining step to achieve it (as in the case of a solid one-piece shield). Its manufacture is simplified.

– Said collar or shoulder may be delimited by all the layers of the protective shield;

– Said collar or shoulder can be arranged axially opposite the fixed component of the damping module;

– Advantageously, at least one of the preassembled layers can be fixedly attached to said fixed component of the damping module, by shrink fitting or by welding or even by cooperation of shapes or riveting;

– Advantageously, the pendular damping device can be fixed on the secondary flywheel, or alternatively on the primary flywheel, by shrink fitting or by welding or even by cooperation of shapes or riveting;

– In such situations, the weld(s) can be made:
- by adding material or by friction (without adding material);
- By butt welding of said parts, for example by laser welding or by capacitor discharge;
- By arc welding, in particular cold so-called "CMT welding".

– The advantage of arc welding (in English CMT, Cold Metal Transfer) is to reduce the release of heat (cold welding principle), this to allow both to position these two parts correctly, to limit the deformations and to increase the tolerance at the level of docking clearances. No additional pre or post machining step is required on these two parts;

– In one embodiment, the protective shield, and in particular at least one of the preassembled layers, can be fixed to the primary flywheel, preferably from the radially outer periphery of the primary flywheel;

– In one embodiment, the protective shield, and in particular at least one of the preassembled layers, can be fixed to the secondary flywheel, preferably from the radially outer periphery of the secondary flywheel;

– In one embodiment, the protective shield, and in particular at least one of the preassembled layers, can be fixed to the support of the pendular damping device, preferably from the radially outer periphery of the pendular support;

– The damping module may further comprise a torsion damper of elastic members, for transmitting a torque and damping rotational acyclisms between the primary and secondary flywheels, the multilayer protective shield being disposed radially to the torsion damper exterior;

– The primary flywheel may comprise a cylindrical portion and a cover defining with the cylindrical portion an annular chamber, the protective shield being at least partly attached to the cover;

– Advantageously, the damping module may further comprise a target intended to be placed facing a sensor capable of delivering a signal representative of the angular position and/or the speed of the target;

– The target can be an annular crown assembled with the primary flywheel or made from material with the primary flywheel. The protective shield can be arranged axially facing the target. In particular, the protective shield can be at least partly attached to the radially inner end of the annular crown of said target;

The invention also relates, according to another aspect, to a torque transmission for a mobility device, comprising a damping module according to the first aspect of the invention.

According to this aspect of the invention, the torque transmission may further comprise:
- a rotating electrical machine;
- A clutch mechanism, for example of the wet or dry type; and or
- A torque transmission shaft, which may be a drive shaft coupled in rotation to a motor; and or
- a release bearing;

Finally, the invention also relates to a motor vehicle comprising a torque transmission according to the present invention.

The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the following description of a particular embodiment of the invention, given solely by way of illustration and not limiting, with reference to the appended figures:
– is an axial section of a damping module, according to a first embodiment of the invention;
– is a perspective view of the damping module, according to the first mode illustrated in ;
– is a detailed view of the damping module, according to the first mode illustrated in ;
– is a detailed view of the damping module, according to a second embodiment of the invention;
– is a detailed view of the damping module, according to a third embodiment of the invention;
– is a detailed view of the damping module, according to a fourth embodiment of the invention;
– is a detailed view of the damping module, according to a fifth embodiment of the invention;

The term "vehicle" means motor vehicles, including not only passenger vehicles, industrial vehicles, in particular heavy goods vehicles, public transport vehicles or agricultural vehicles, but also any transport vehicle making it possible to pass from a point to another a living being and/or an object. The latter may include a hybrid motorization, an electric motorization and/or low mobility.

By "pendulum body" is meant an oscillating mass which is mounted so as to oscillate on the support in response to the acyclics of the command motor or of the vehicle. A pendular body is conventionally made up of a pair of oscillating masses, or "pendulum masses", extending so as to sandwich the support and rigidly joined together. A pendular body can be constituted by a single oscillating mass. The single oscillating weight can be sandwiched between two supports. In addition, a pendular body may comprise at least one connecting member, called a spacer, adapted to pair the pair of oscillating weights with each other.

In the remainder of the description and the claims, the terms "inner/internal" or "outer/external" with respect to the X axis and in a radial orientation will be used, without limitation and in order to facilitate understanding thereof. , orthogonal to said axial orientation; and the terms "rear" AR and "front" AV to define the relative position of one element with respect to another in the axial direction, an element intended to be placed close to the engine being denoted by rear and an element intended to be placed close to the gearbox being referred to as front.

In the description, certain elements can be indexed, such as: the first and second pendular damping devices; the first and second ends; primary flywheels or secondary flywheels. It is a simple indexing to differentiate and name close but not identical elements. This indexing does not imply a priority of one element over another and it is easy to interchange such denominations without departing from the scope of the present description.

Unless otherwise specified, "axially" means "parallel to the X axis of rotation of the damping module or protective shield"; "radially" means "along a transverse axis intersecting the axis of rotation of the damping module or the protective shield"; “angularly” or “circumferentially” means “around the X axis of rotation of the damping module or the protective shield”. In particular, the thicknesses Ec, Ep and the axial lengths Hb, h1, h2, h3 are here measured along the axis X of rotation. Whereas, the thicknesses e0, e1, e2, e3 and the radial length Hp are here measured radially with respect to the axis X of rotation.

The shape of a "shield" is distinguished from that of a "cover": the protective shield extends substantially in cross-section parallel to the axis X. Conversely, the cover extends substantially in cross-section transverse perpendicular to or in the direction of the X axis.

Reference is made to FIGURES 1 to 3 representing a damping module 1 of a torque transmission, such as a double damped flywheel according to a first embodiment. The dual mass flywheel additionally includes:
- a primary flywheel 2, intended to be fixed to a driving shaft, such as a crankshaft of a combustion engine, and
- a secondary flywheel 3, which is centered and guided on the primary flywheel 2 by means of a rolling member called bearing 7, such as a centering bearing for the secondary flywheel 3, and
- a torsion damper 4 comprising at least a series of elastic members 40, preferably curved, making it possible to transmit the torque and to dampen the acyclic rotations between the primary 2 and secondary 3 flywheels in order to reduce the vibrations coming from the motor vehicle engine;
- a torque limiter 50, further comprising a central web 500 cooperating with the elastic members 40,
- at least one pendular damping device, for example here two pendular damping devices 5A, 5B, which can be of different order n1, n2, in other words differently designed and positioned in order to be specifically tuned according to the number of engine cylinders; And
- At least one protective shield 60 of the multilayer type, arranged to contain the bursting of at least one pendulum damping device, here the second pendulum damping device 5B.

Furthermore, the primary 2 and secondary 3 flywheels are intended to be mounted mobile around an axis X of rotation and are, moreover, mobile in rotation with respect to each other, around said axis X .

Also, the primary flywheel 2 has:
- a primary central hub 25, radially internal, carrying the bearing 7 with the secondary flywheel 3,
- an annular portion 22 called primary mass, extending radially and
- a cylindrical portion 23 extending axially, on the side opposite the engine, from the outer periphery of the annular portion 22. The primary flywheel 2 also comprises an annular cover 24 fixed to the cylindrical portion 23. The annular cover 24 defines with the annular portion 22 and the cylindrical portion 23, an annular chamber 28.

In addition, the cover 24 is fixed integrally to the cylindrical portion 23, in particular by welding 100.

In addition, the primary flywheel 2 carries, on its outer periphery, a ring gear 23' for driving the primary flywheel 2 in rotation, using a starter. On the , orifices 259 are formed on the central hub 25 opposite orifices 229 formed in the radially inner portion of the annular portion 22 of the primary flywheel. Fixing screws, not shown, engaged in these holes, allow the fixing of the primary flywheel to the end of the driving shaft. Similarly, the secondary flywheel 3 may include orifices (not shown), intended for the passage of the screws, when mounting the double damped flywheel on the drive shaft.

In operation, the elastic members 40 are pressed outwards against the cylindrical portion 23 by the centrifugal force acting on them. Therefore, guide members, in the form of troughs 41, are mounted in the annular chamber 28, between the cylindrical portion 23 of the primary flywheel 2 and the outer periphery of the elastic members 40. The troughs 41 are formed of a curved sheet longitudinally and transversely.

To limit the friction between the elastic members 40 and the cylindrical portion 23 of the primary flywheel 2, the annular chamber 9 is filled with a lubricating agent, preferably grease or oil.

In addition, to prevent lubricant leaks to the outside of the annular chamber 24, at least one washer 58 seals the primary and secondary flywheels.

A single sealing washer 58 here extends radially between the cover 24 and the secondary hub 35. In an embodiment not illustrated, the torque limiter may comprise a plurality of washers, for example two sealing washers arranged axially on either side of the cover.

Furthermore, the sealing washer 58 is axially sandwiched between the pendular support 53B and the secondary hub 35, and in particular it is interposed and tightly mounted with the latter, in particular by riveting.

In particular, the sealing washer 58 is fixed integrally, using fixing means 70:
- On the one hand, with the torque limiter 50, and in particular with the central veil 500 of the torque limiter; And
- Secondly, with the pendular damping device 5B, and in particular with the pendular support 53B.

Furthermore, the primary flywheel 2 may comprise through-mounting openings in the annular portion 22, for handling and mounting fastening means. To this end, these through openings are designed as breakthroughs at the fixing means and, after assembly, are closed by means of sealing plugs pressed into said through openings, for optional closing.

Furthermore, the elastic members 40 are curved, with a circumferential effect, such as helical springs, housed in the annular chamber 28 and distributed circumferentially around the axis X. The drive washer 51 comprises fingers 514, here number of two, which cooperate circumferentially with the elastic members 40.

In addition, each curved elastic member 40 may comprise two coaxial springs mounted one inside the other.

Furthermore, the elastic members 40 extend:
- on the one hand, between two support seats 220 carried by the primary steering wheel 2, and
- On the other hand, between two support legs 514 provided on the central web 500 of the torque limiter.

Furthermore, each support seat 230 carried by the primary flywheel 2 consists of a boss formed in the annular portion 22 and by a boss formed in the cover 24.

In operation, the elastic members 40 bear, at a first end, against a support seat 220 carried by the primary flywheel 2 and, at a second end, against a support lug 514 formed on the drive washer 51 , to ensure the transmission of torque between the primary flywheel 2 and the torque limiter 5. Thus, the torque is transmitted by the crankshaft to the primary flywheel 2 which compresses the elastic members 40. The latter, resting on the tabs 514, cause the compressed central veil 500, which in turn drives the secondary flywheel 3.

Furthermore, the secondary flywheel 3 comprises:
- a hub 35 or secondary flange, radially internal, centering the bearing 7,
- an annular portion 32 called secondary mass, extending radially and
- a cylindrical portion called the outer edge 33 extending axially, on the side opposite the motor, from the outer periphery of the annular portion 32.

In the examples illustrated, the cover 24 is radially opposite the secondary hub 35 .

In the examples illustrated, the cover 24 further comprises:
- A radial portion, of thickness Ec and whose interior defines a bottom covering the elastic members 40;
- an annular flange 26', having an axial orientation in the form of an annular crown 260;
- a target 26 resulting from material with the flange 26 ', forming a reading zone of a sensor (not illustrated), the sensor making it possible to deliver a signal representative of the angular position and/or the speed of the target 26.

In addition, this sensor is able to inform the vehicle's computer of the position of the crankshaft, which allows the vehicle's computer to correctly control fuel injection and, for gasoline engines, spark plug ignition. The annular crown 600 defines a reading zone for the sensor.

Furthermore, the annular crown 260 comprises a plurality of windows separated from each other by fingers extending in the axial direction, parallel to the axis X, or in a variant not shown, by arms.

In the first mode, the flange 26', and in particular the target 26, extends from the outer periphery of the radial portion, here in the form of fingers extending forwards AV of the damping module. By way of example, the cover 24 is a one-piece part, having a substantially equal thickness Ec over the entire cover, the target being made in one piece with that of the cover.

Furthermore, the secondary flywheel 3 is intended to form the reaction plate of a clutch, not shown. The dual mass flywheel may therefore comprise a clutch mechanism further comprising:
- a clutch cover, fixed to the outer periphery of the secondary flywheel, at least one clutch disc, equipped with friction linings and a splined hub connected to the transmission shaft,
- a pressure plate and an annular diaphragm axially urging the pressure plate towards the secondary flywheel. The pressure plate can be connected in rotation to the cover by tangential elastic tabs, with axial action allowing axial movement of the pressure plate relative to the reaction plate; And
- A clutch thrust bearing capable of pivoting the diaphragm 17 to move the clutch towards its disengaged position.

In the examples illustrated, the secondary flywheel 3 has, near its outer edge 33, holes 330 used to mount a clutch cover of the clutch mechanism, by means of studs 330.

In the examples illustrated, each pendular damping device 5A, 5B comprises:
- A pendular support 53A, 53B, rotatable about the X axis of rotation, and in which a support window 530A, 530B defining a support rolling track;
- A pendulum body 55A, 55B in which a pendulum body running track is formed, the pendulum body being mounted on a respective support 53A, 53B.

Furthermore, each pendular body 55A, 55B comprises at least:
- An oscillating mass 54A, 54B, guided in oscillation relative to the support 53A, 53B;
- A connecting member called a spacer 56A, 56B, matching the at least one oscillating mass 54A, 54B through a window 530A, 530B of support 53A, 53B, for example riveted or press-fitted; And
- a running gear 57A, 57B that can roll
on the support roller track and
on the pendulum body running track.

In the examples illustrated, the pendulum support 53A, 53B generally has the shape of a ring consisting of a cut metal sheet, generally made of steel, with a thickness typically less than 10 mm (millimeters), preferably less than 8 mm. In addition, the radially outer contour of the pendular support 53A, 53 may be of circular shape, and defines the outer diameter DP2 of the pendular damping device 5B.

Furthermore, the pendular support 53A, 53B can be:
- a torsion damper input element; Or
- An intermediate output or phasing element, arranged between two series of shock absorber springs; Or
- An element connected in rotation to one of the aforementioned elements and separate from the latter, then being for example a specific support to said device 5A, 5B of pendular damping.

Thus, the pendular support 53A, 53B can then be chosen from among:
- a component guide washer,
- a component phasing washer, or
- A support separate from said sail, from said guide washer and from said phasing washer, such as a flange. In the case where the device is integrated into a flywheel secured to the crankshaft, the support may be secured to this flywheel.

By way of example, the pendular damping device 5B, and in particular the pendular support 53B, is integral with the secondary flywheel 3, fixed here by riveting. Furthermore, the oscillating masses 54B of the second device 5B are positioned in the annular space V0 formed axially between the annular chamber 28 and the radially outer portion of the secondary flywheel 3. Thus, the oscillating masses 54B extend outside the chamber ring 28 filled with grease. The operation of the pendulum damping device 5B is then not likely to be disturbed by the grease. The oscillating masses 54B are arranged at a radial distance from the axis X substantially equal to that of the elastic members 40. The oscillating masses 54B are remote from the axis X, so that the effectiveness of the device 5B is optimal.

The device 5B, and in particular its support 53B, is fixed together, using fixing means 70:
- On the one hand, with the torque limiter 50, and in particular with the central veil 500 of the torque limiter; And
- On the other hand, with the secondary steering wheel 3, and in particular with the secondary hub 35.

The fixing means 70 are here a series of rivets, distributed angularly around the axis X, preferably according to a regular distribution. Therefore, the central web 500, the support 53B and the secondary hub 35 each comprise coaxial orifices 700, provided for the passage of fixing means 70, here nine in number.

In particular, the support 53B, and in particular its ring 59, is sandwiched axially between the pendular support 53A and the secondary hub 35, being interposed and tightly mounted with the latter, here by riveting.

For example, the pendular damping device 5A forms the torque limiter 50. Therefore, the central web 500 is formed by a single pendular support, here the support 53A of said first device 5A. In addition, the support 53B is secured to the secondary flywheel 3, fixed here by riveting.

Advantageously, each pendular body 55A, 55B can comprise two oscillating masses 54A, 54B in reaction to the irregularities in rotation, which are paired by means of at least one connecting member commonly called a "spacer". Each spacer 56A, 56B can be riveted respectively to the oscillating weights 54A, 54B, or force-fitted respectively into the oscillating weights 54A, 54B.

Each oscillating mass 54A, 54B comprises a main body which extends radially and circumferentially, and is generally arcuate in shape. The main body extends radially between radially inner 54i and radially outer 54e edges of oscillating mass 54A, 54B. In addition, the main body of an oscillating mass 54A, 54B extends circumferentially between a first circumferential end 541 and a second circumferential end 542. The oscillating masses 54A, 54B respectively of the devices 5A, 5B are here located on either side of other of the support 53A, 53B and are axially opposite.

In particular on the , each pendular body 55A, 55B comprises two spacers 56A, 56B.

The first and second rolling tracks have a general epicyclic shape and are arranged such that the frequency of oscillation of the oscillating masses 54A, 54B is proportional to the speed of rotation of the driving shaft. The oscillating weights 54A, 54B may also include stop elements made of elastomeric material to absorb shocks when the oscillating weights 54A, 54B reach the end of their travel or when the engine stops. The abutment elements are here arranged between the two sides of each oscillating weight 54A, 54B and come into abutment against the edge of the passage openings of the spacers 56A, 56B.

In another embodiment not shown, each pendular body comprises a single oscillating mass and two supports. The two supports of the pendular damping device can be paired by means of at least one connecting member such as a rivet positioned radially internally with respect to the pendular body or bodies. In such a situation, the two supports may face each other axially, the oscillating mass is then located respectively between the two supports.

Furthermore, the rolling member 57A, 57B is, for example, a roller. Alternatively, the rolling member can be a ball or a ball bearing. In a variant not shown, a pendulum body can be mounted oscillating on the pendulum support, for example by means of a single rolling member.

Alternatively, each pendular body can be mounted oscillating on the support by means of two rolling members. The two running gear can then pass through a single window in the support and guide the movement of the oscillating mass or masses, of a pendular body relative to the support.

The support 53A, 53B extends axially between two opposite side faces 531A, 531B. The side faces 531B can be planar. The two side faces 531B of the device 5B can extend between a radially inner edge and a radially outer edge. The radially inner edge may conventionally be circular in shape.

At least one window 530A, 530B passes through the support 53A, 53B along its thickness. Each of the windows 530A, 530B defines an empty space inside said support 53A, 53B. Preferably, as many windows 53A, 53B as there are pendulum bodies 55A, 55B pass through the support 53A, 53B. Each spacer can pass through a window of the support. Each spacer 56B can be respectively entirely received in the thickness of said window 53B.

Furthermore, the running gear 57A, 57B defines two substantially transverse side faces 571. The two side faces 571 of the running gear may have a domed shape, and extend radially between the running surface facing the oscillating masses. Each rolling member 57A, 57B can advantageously pass through a window 530A, 530B of the support and guide the movement of the oscillating weight(s) 54A, 54B relative to the support 53A, 53B. In the examples illustrated, each rolling member 57A, 57B can roll on a support rolling track secured to the support 53A, 53B when the pendular body 55A, 55B is supported by centrifugal force. The curvature of the support race 41 can be convex.

By way of example, at least one of the pendular supports, here the support 53B, comprises a ring 59 ensuring the support of the oscillating masses and intended to ensure the centering of the support 53B with respect to the axis X. Thanks to the constitution in two elements of the support 53B, the ring 59 can advantageously be made up of a non-stamped flat part, which makes it possible to more easily ensure the precision of the geometry of the rolling tracks formed by the outer edge of the openings made in ring 59.

Alternatively, the pendulum support and/or the ring 59 can be centered and guided in rotation on the cylindrical surface of the secondary flywheel 3, via a plain bearing ring. This ring is then made of a material having a low coefficient of friction. Alternatively, the pendular support may comprise an internal hub, one-piece or separate, arranged to cooperate with a rolling member or bearing, in order to center and guide the internal hub in rotation with respect to the secondary flywheel.

The multilayer protective shield 60 is remarkable in that it is formed from a set of layers 61, 62, 63, that is to say at least two layers which are preassembled together, in particular by tight fit.

The protective shield 60 of the multilayer type is remarkable in that it surrounds the pendular damping device 5B, for example in order to counter the bursting of the oscillating masses 54B positioned radially inside said protective shield 60 multilayer. Furthermore, the pendular damping device 5B is received entirely inside the protective shield, in particular inside a single layer, or alternatively inside at least two layers. In other words,

Alternatively not shown, the pendulum damping device can be received inside all of the preassembled layers.

The number of layers can be limited to five, to simplify the manufacture of such a multilayer protective shield 60. In particular, the protective shield 60 comprises at least two layers 61, 62 which are:
- a radially inner layer 61, defining the radially inner periphery of the protective shield, and
- a radially outer layer 62, defining the radially outer periphery of the protective shield.

In all cases, the outer layer 62 at least partially covers the other or the other layers 61, 63. Furthermore, these layers 61, 62, 63 extend continuously, or in a discontinuous variant, around the X axis.

Thus, they circumferentially at least partially surround said at least one pendular damping device 5B. Alternatively, at least one of the layers of the protection shield can be segmented. In the examples shown, the layers 61, 62, 63 are all circumferentially continuous around the X axis.

By way of example, the layers 61, 62, 63 can be different from each other, having:
- slices or different thicknesses e1, e2, e3; and or
- different axial lengths called heights h1, h2, h3; and or
- different materials, for example of different hardnesses or different densities; and or
- different shapes, for example continuous and/or segmented around the X axis.

Alternatively, the layers of the protective shield can be of identical axial and radial dimensions.

Alternatively or in addition, the materials of the layers of the protective shield may be identical.

In a non-illustrated embodiment, the inner or outer layer can be discontinuous and segmented. Such segments can then be half-cylinders spaced out and stacked on top of each other, or alternatively, strips of curved sheets and angularly distributed around the X axis;

In addition, the multilayer protective shield 60 is remarkable in that it is formed from a set of cylinders preassembled together, in particular by interference fit. Thus, the layers 61, 62, 63 are made in the form of cylinders, preferably thinned, inside which the pendular damping device 5B is contained at least in part. Alternatively, the layers of the protective shield can be of conical shapes.

Each layer is made from a sheet, for example made in identical sheets, to standardize the manufacture and use the same range of tools and metallic example, obtained by bending carried out either by pressure or by impact. Also, layers 61, 62, 63 of the material shield. The rolling of a layer 61, 62, 63, known as the "bending" step to form cylinders, is a technique for transforming a sheet (flat surface) into cylinders with a closed cylindrical or conical surface (closed rolling) or open rolling . Then, the layers, and in particular the cylinders constituting the protective shield, are tightly embedded, for example heat-wrapped. Alternatively, any other existing means of preassembling the layers is also possible.

Furthermore, the protective shield 60 is attached fixedly to a fixed component C0, for example by riveting or by welding or by cooperation of shapes. This fixed component C0 is remarkable in that it is chosen from among those of the damping module, in particular one among: the primary flywheel 2, the secondary flywheel 3 and the pendular support 53B of the pendular damping device 5B.

In addition, the thickness Eb of the protective shield 60 is defined by the sum of the thicknesses of the layers 61, 62, 63. The layers, and in particular the cylinders, are thinned, which reduces their mass and inertia. Each layer 61, 62, 63 can be of relatively low thickness e1, e2, e3, for example between 0.25 and 1 mm.

The layers 61, 62, 63 of the shield can be of different thicknesses e1, e2, e3, or alternatively identical. The outer layer 62 here has a thickness e1 greater than that of the inner layer 61. In the examples shown, the thickness Eb of the protective shield is strictly less than the thickness Ep of the pendular support 53B.

By way of example, the thickness e2 of the outer layer 62 can be:
- 1.5 times greater than or equal to the thickness e1 of the inner layer 61, and/or
- 2 times less than or equal to the thickness e1, for example between 1.5 and 1.9 times the thickness e1.

In addition, the thickness e1, e2, e3 of the same layer is substantially the same over the whole of said layer.

Furthermore, there is no variation in the thickness of layers 61, 62, 63. Each of the layers 61, 62, 63 extends in cross section parallel to the axis X. In particular, the layers 61, 62 , 63 each have a radially inner surface respectively 610, 620, 630, of cylindrical shape, which extends in cross section parallel to the axis X. Thus, the layers 61, 62, 63 of the protective shield are free from deformations or radial offset or any other variation in thickness. The size of the shield is limited.

Preferably, the layers 61, 62, 63 of the protective shield, and in particular the radially internal surfaces 610, 620, 630, are of solid shapes, that is to say free of windows or any other shrinkage of material.

In the examples illustrated, the radially inner surface 610 of the inner layer 61 can receive or come into abutment against the bursting of the pendular damping device, for example to counter the displacement of the pendular bodies 55B, or even of the pendular support 53B.

In particular, the radially inner surface 610 defines the inner diameter DB1 of the protective shield 60.

In the first embodiment, the layers 61, 62 of the protective shield 60 are two in number, the inner layer 61 called hoop being then expanded and then threaded on the outer layer 62 called hoop. Therefore, the inner layer 61 is preassembled by shrink fitting on the radially inner surface 620 of the outer layer 62.

Preferably, the inner layer 61 may be the longest or the tallest of the protective shield layers. The height h1 of the inner layer 61 is then strictly greater than the height h2 of the outer layer 62, so as to constitute the longest or highest layer of the protective shield. Therefore, the axial lengths called heights h1, h2, h3 of the layers 61, 62, 63 can be of different dimensions, so as to form a height difference Δh, calculated as follows in the first mode: Δh = h1 - h2.

Alternatively, the heights of the layers of the protective shield can be of identical dimensions. In the examples illustrated, the axial length called height Hb of the protective shield is strictly less than the radial length Hp of the pendular support 53B.

By way of example, the height Hb of the shield is strictly less than half the radial length Hp of the pendulum support 53B. The height Hb of the shield is defined by the greatest axial length (called height) of the layers 61, 62, 63, for example the height h1 of the inner layer 61.

In other words, the height Hb of the protective shield is equal to the height h1 of the inner layer 61 in the first embodiment. Thus, the pendular damping device 5B is received entirely inside the inner layer 61, here the only sufficiently long or extended layer. The inner layer 61 is then the thinnest and most extended layer, in comparison with the other layers 62, 63 of the protective shield.

In addition, this difference in heights Δh between the preassembled layers, in particular here between the heights h1, h2 respectively of the inner 61 and outer 62 layers, delimits an empty space of material, delimited at the rear end AR of the protective shield and arranged to receive the C2 gearbox housing.

Further, this empty, free space is formed without removal of additional material. In addition, this empty space forms a collar or shoulder, which is delimited by all the layers of the protective shield. The collar 65 or shoulder can be arranged axially opposite the fixed component C0. In the first mode, the rear end AR of the protective shield 60 comprising a collar 65 or shoulder which is delimited by the difference in heights Δh between the heights h1, h2 of the inner 61 and outer 62 layers.

In another embodiment not illustrated, it is possible to rectify the end of said layers of the protective shield, for example by producing a beveled or chamfered portion at the front end of the shield, by cutting one or more layers, according to the dimensions of the C2 gearbox housing.

In addition, the protective shield is attached fixedly to the fixed component C0, for example by shrinking or by means of a weld 200, for example of the laser welding or CMT welding type. As a variant not shown, such a weld can be made by capacitor discharge or by friction. In the examples illustrated, the protective shield and the fixed component C0 are attached fixedly end to end, by laser welding or CMT welding. By “CMT welding” (in English CMT, Cold Metal Transfer), we mean here a “cold welding” for welding in particular thin parts or parts having a certain profile, with significant docking clearances between them which can prove problematic for a laser butt weld.

In a CMT weld, the filler metal is deposited with precision between the protective shield and the fixed component C0, by interrupting the short arc in a targeted manner (known as short circuits).

In addition, the protective shield 60 includes a fixing interface 600, arranged to receive the fixed component C0, and which also receives the solder 200. By way of example, this fixing interface 600 can be formed by all of the slices or thicknesses e1, e2, e3 of the layers 61, 62, 63. Alternatively, a single layer 61 or 62 or 63 can form the fixing interface 600, in other words only one of the layers 61 or 62 or 63 can then be fixed on the fixed component C0.

In the first mode, the protective shield 60 is welded to the primary flywheel 2, here on the outside of the cover 24. By way of example, the weld 200 is made on the edge or thickness Eb of the shield. In particular, the protective shield 60, and in particular its attachment interface 600, is arranged at the radially outer periphery of the primary flywheel 2, in particular at the level of the flange 26', here radially below the target 26 This limits bulk and measurement errors with the sensor.

In the first mode, the attachment interface 600 is a radial bearing surface, here formed by two layers, here the inner 61 and outer 62 layers. In particular, the attachment interface 600 is the sum of the slices of thicknesses e1, e2, e3 of the layers 61, 62, 63.

Therefore, the slice of thickness Eb of the protective shield delimits the fixing interface 600.

Furthermore, it is possible to space the radial position of the protective shield 60, and in particular the fixing interface 600, from that of the pendular damping device 5B, according to a certain predetermined distance called functional clearance JR. By way of example, this functional clearance JR can be delimited radially between the inner diameter DB1 of the protective shield 60 and the outer diameter DP2 of the pendular damping device 5B.

In the first embodiment, the radial position of the protective shield 60 is spaced from that of the oscillating masses 54B. In particular, the inner layer 61 of the protective shield 60 can be configured in such a way as to be spaced radially from the oscillating masses 54B, by a functional clearance JR predefined here.

This functional clearance JR is then less than a radial distance likely to cause plastic deformation of said inner layer 61.

It has been described on the a second embodiment of the invention substantially similar to the first embodiment, except that:
– The fixing interface 600 is a bearing surface extending axially, on which the weld 200 is made;
– This weld 200 extends axially over the cylindrical portion 23 and the cover 24;
– The fixing interface 600 is formed on a part, here the front axial end AV, of the inner layer 61;
– The protective shield 60 is attached fixedly to several parts of the primary flywheel 2: the cylindrical portion 23 and the cover 24, ie here on two of the parts constituting the primary flywheel 2;

In this embodiment, the attachment interface 600 is formed on a part of the radially inner surface 610 of the inner layer 61, in other words over a zone extending over 5% to 45% of the radially inner surface 610, in other words the axial length called the height h1 of the inner layer 61. By way of example, the axial dimension of the fixing interface 600 is strictly greater than the thickness Ec of the cover 24.

By way of example, the fixing interface 600 can be substantially equal to the thickness Ep of the pendular support 53B. On the , the attachment interface 600 is an area of about 20% of the radially inner surface 610. Thus, the weld 200 fixedly connects the protective shield 60, the cylindrical portion 23 and the cover 24.

It has been described on the a third embodiment of the invention substantially similar to the first embodiment, except that:
– The protective shield 60 is formed of three layers 61, 62, 63 preassembled together, including:
- the layer radially closest to the so-called inner X axis 62, which defines the inner periphery of the shield,
- the radially farthest layer from the so-called outer X axis 61, which defines the outer periphery of the shield, and
- an intermediate layer 63, interposed radially between the inner 61 and outer 62 layers;
- The axial length said height h3 of the intermediate layer 63 is here equal to that of the outer layer 62;
– The material of the intermediate layer 63 may be different from that of the inner 61 and outer 62 layers;
– The layers 61, 62, 63 are thinned cylinders, tightly fitted, in particular shrunk into each other;
– The cover 24 and the flange 26' are located radially on either side of the protective shield 60;
– The protective shield 60 can be attached fixedly to several parts of the primary flywheel 2: the cylindrical portion 23, the cover 24 and the flange 26', ie here to three of the parts constituting the primary flywheel 2;
– The fixing interface 600 can be formed of a groove 610 fitted into the cover 24;
– The fixing interface 600 can be formed together on:
- on a part, here the front axial end AV, of the inner layer 61, and/or
- on a part, here the front axial end AV, of the outer layer 62, and
- on the slice of thickness Eb of the protective shield 60;

In this embodiment, the protective shield 60 comprises the groove 610. This groove 610 is delimited by the layers 61, 62, 63, in particular by teeth delimited on their front end AV. These spline teeth 610 are intended to be received in openings 240 managed in the cover 24.

On the , the spline 610 can be connected by welding 200. In addition, the fixing interface 600 can be formed both on the slice of thickness Eb and part of the height Hp of the shield.

In addition, the fixing interface 600 can be formed by three layers 61, 62, 63. By way of example, the fixing interface 600 can be formed jointly:
- over a zone extending over 5% to 45% of the axial length called the height h1, in particular less than 15%;
- over a zone extending over 5% to 45% of the axial length called the height h2, in particular less than 20%;
- by the sum of the slices of thicknesses e1, e2, e3 of the layers 61, 62, 63;

On the , the thickness e3 of the intermediate layer 63 is equal to the thickness e2 of the outer layer 62. By way of example, the radial dimension of the fixing interface 600 can be equal to the thickness Ec of the cover 24 The axial dimension of the fixing interface 600 can be equal to the thickness Ep of the pendular support 53B.

In a variant not shown, the intermediate layer 63 can entirely contain the pendular damping device. In another variant not shown, said intermediate layer 61 can be a segmented cylinder.

It has been described on the a fourth embodiment of the invention substantially similar to the first embodiment, except that:
– The protective shield 60 is attached to the secondary flywheel 3, here on its radially outer periphery;
– In particular, the inner layer 61 is attached fixedly to the secondary steering wheel 3, here at the level of the studs 330;
– The axial end, here before AV, of the inner layer 61 is welded to the secondary flywheel, by welding 200;
– The protective shield 60 is formed of three layers 61, 62, 63 preassembled together, including:
- the layer radially closest to the so-called inner X axis 62, which defines the inner periphery of the shield,
- the radially farthest layer from the so-called outer X axis 61, which defines the outer periphery of the shield, and
- an intermediate layer 63, interposed radially between the inner 61 and outer 62 layers;
- The axial length said height h3 of the intermediate layer 63 is here less than that of the outer layer 62;
– The collar 65 or the shoulder is made in a stepped form, at the front end AV of the protective shield 60, by the differences in the heights h1, h2, h3 of said layers, and this without shrinkage of material;
– Similarly, the height difference Δh is calculated as follows: Δh = h1 – h2;
– The material of the intermediate layer 63 may be different from that of the inner 61 and outer 62 layers;
– The layers 61, 62, 63 are thinned cylinders, tightly fitted, in particular shrunk into each other;

It has been described on the a fifth embodiment of the invention substantially similar to the first embodiment, except that:
- The protective shield 60 is fixed on the pendular support 53B of the pendular damping device 5B, in particular on the radially outer periphery of the pendular support 53B;
– The central zone of the inner layer 61 is attached fixedly to the pendular support 53B, this symmetry makes it possible to counter the bursting of the oscillating masses 54B arranged axially on either side of the support 53B;
– The attachment interface 600 is formed substantially in the center of the inner layer 61;
– The inner layer 61 is welded to here on its radially outer periphery of the pendular support 53B;
– The protective shield 60 is formed of three layers 61, 62, 63 preassembled together, including:
- the layer radially closest to the so-called inner X axis 62, which defines the inner periphery of the shield,
- the radially farthest layer from the so-called outer X axis 61, which defines the outer periphery of the shield, and
- an intermediate layer 63, interposed radially between the inner 61 and outer 62 layers;
- The axial length said height h3 of the intermediate layer 63 is here less than that of the outer layer 62;
– The collar 65 or the shoulder is made in a stepped form, at the front end AV of the protective shield 60, by the differences in the heights h1, h2, h3 of said layers, and this without shrinkage of material;
– Similarly, the height difference Δh is calculated as follows: Δh = h1 – h2;
– The material of the intermediate layer 63 may be different from that of the inner 61 and outer 62 layers;
– The layers 61, 62, 63 are thinned cylinders, tightly fitted, in particular shrunk into each other;
– The functional clearance JR is here delimited radially between the inner diameter DB1 of the protective shield 60 and the radially outer edges 54e of the oscillating weights 54B.

The use of the verb "to comprise", "to understand" or "to include" and of its conjugated forms does not exclude the presence of other elements or other steps than those set out in a claim. In the claims, any reference sign in parentheses cannot be interpreted as a claim limitation.

Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention. The dimensions given or illustrated may not be to scale and correspond only to a particular model of multi-layer protection shield developed by the applicant. The manufacturing process according to the invention will be adapted as much as necessary to other nominal diameters of the shield and to other thicknesses, heights of its layers.

Claims (13)

Damping module (1) for torque transmission, comprising at least:
- a primary flywheel (2) of inertia, intended to receive a drive torque from a driving shaft, and a secondary flywheel (3) of inertia, movable in rotation with respect to each other around an axis (X) of rotation;
- a pendular damping device (5B) arranged axially between the primary (2) and secondary (3) inertia flywheels, the pendular damping device (5B) comprising at least one pendular body (55B) movably mounted on at least one pendular support (53B); And
- a multilayer protection shield (60) against bursting of the pendulum damping device (5B), formed of preassembled layers (61, 62, 63) at least partially surrounding the pendulum damping device (5B), the shield multilayer protection (60) being attached fixedly to a fixed component (C0) of the damping module chosen from among: the primary flywheel (2) of inertia, the secondary flywheel (3) of inertia and the pendular support (53B) of the pendulum damping device (5B). Damping module (1) according to claim 1, wherein the number of layers (61, 62, 63) is between two and five layers. Damping module (1) according to Claim 1 or 2, in which the layers (61, 62, 63) of the protective shield (60) are assembled by interference fit, in particular by shrinking. Damping module (1) according to any one of the preceding claims, in which the layers (61, 62, 63) of the protective shield are cylinders inside which the device (5B) is at least partly received. pendulum damping. Damping module (1) according to any one of the preceding claims, in which at least two layers (61, 62, 63) of the protective shield are different from each other by at least one of thickness (e1, e2, e3), axial length (h1, h2, h3), material and shape. Damping module (1) according to any one of the preceding claims, in which
- the thickness (Eb) of the protective shield (60), defined by the sum of the thicknesses (e1, e2, e3) of said layers (61, 62, 63), is less than or equal to the thickness (Ep) of the pendulum support (53B); and or
- the axial length called height (Hb) of the protective shield (60), defined by the axial length called height (h1, h2, h3) of at least one of the layers (61, 62, 63), is lower or equal to the radial length (Hp) of the pendular support (53B). Damping module (1) according to any one of the preceding claims, in which the protective shield (60) comprises a fixing interface (600) intended to be fixed integrally to the fixed component (C0), the fixing interface (600) being formed at least in part by:
- all of the slices or thicknesses (e1, e2, e3) of the layers (61, 62, 63), and/or
- the axial length called height (h1, h2, h3) of one of the layers (61, 62, 63), for example formed over a zone extending over 5% to 45% of the height of an inner layer ( 61) of the protection shield. Damping module (1) according to any one of the preceding claims, in which the layers (61, 62, 63) of the protection shield (60) extend in cross section parallel to the axis (X) of such so as to be free of deformations or radial offset. Damping module (1) according to any one of the preceding claims, in which at least one of the layers (61, 62, 63) of the protective shield (60) is fixed to the fixed component (C0)
by riveting or by welding (200) or by shrinking or by co-operation of shapes, for example by laser welding, or by CMT arc welding, or by capacitor discharge welding, or by friction welding. Damping module (1) according to any one of the preceding claims, in which the protective shield (60) comprises at least among the preassembled layers (61, 62, 63):
- an inner layer (61) radially closest to the axis (X), and
- an outer layer (62) radially farthest from the axis (X),
the outer layer (62) being of thickness (e1) greater than that of the inner layer (61), and/or the inner layer (61) being of axial length called height (h1) greater than that of the outer layer ( 62). Damping module (1) according to the preceding claim, in which the axial length called height (h1) of the inner layer (61) is strictly greater than that of the outer layer (62), a collar (65) or a shoulder being delimited by the difference in heights (h1, h2) of the inner (61) and outer (62) layers, said collar (65) or shoulder being arranged at the end of the protective shield (60), preferably axially opposite of the fixed component (C0). Damping module (1) according to any one of the preceding claims, in which the layers (61, 62, 63) of the protective shield (60) are formed from sheets, separate or identical, for example of the metallic type , non-metallic, metal alloy, and/or composite material. Damping module (1) according to any one of the preceding claims, in which it further comprises:
- a torsion damper (4) of elastic members (40) for transmitting a torque and damping the acyclic rotation between the primary (2) and secondary (3) inertia flywheels, said protective shield (60) being arranged radially outside the torsion damper (4); and or
- the primary flywheel (2) of inertia comprising a cylindrical portion (23) and an annular cover (24) defining a chamber (28), said protective shield (60) being at least partly attached to the cylindrical portion (23 ) and/or on the lid (24); and or
- a target (26) intended to be placed opposite a sensor able to deliver a signal representative of the angular position and/or the speed of the target, the target (26) being formed of an annular ring (260 ) assembled or made in one piece with the primary flywheel (2) of inertia, said protective shield (60) being disposed radially below the target (26), preferably on the radially inner end of the annular crown (260 ) of the target (26).