FR3131604A1 - TORSION DAMPING DEVICE - Google Patents

Abstract

TORSION DAMPING DEVICE . Device (100) comprising: - a first rotating element (1), - a second rotating element (2) coupled in rotation to an output element (5), - an elastic device (11) interposed between the first and second rotating element, and comprising a first spring (13) extending between a first end (131) and a second end (132), - a first flange (30) between the first end (131) and the first rotating element (1), - a second flange (40) arranged between the second end (132) and the first rotating element (1), the first rotating element (1) moves the first end (131) towards the second end, via the first flange (30), when it is movable in the forward direction, the first rotating element (1) moves the second end (132) towards the first end, via the second flange (40), when it is movable in the indirect direction, at least one of the first and second flanges is deformable between a position where it has radial play (E) with a force-absorbing element, and a position where it is in contact with said element, the force-absorbing element being chosen from among the central transmission element (5), the first and the second rotating element. Figure for abstract: Figure 1

Description

TORSION DAMPING DEVICE

The invention relates to the field of torque transmission in motorized devices and concerns a torsion damping device for a vehicle transmission chain.

Motorized vehicles generally include such torsion damping devices which can be integrated into various elements of the transmission chain. For example, a double-damped flywheel, a clutch disc, or a torque limiter, can include a torsion damping device allowing the filtering of engine acyclisms and other torsional oscillations. This filtering is typically carried out by one or more torsion dampers which are spring-damper combinations working in torsion and allowing, during the transmission of the torque, a relative rotational movement of a first rotating element for transmitting a torque , coupled upstream of the transmission chain, and a second rotating torque transmission element, coupled downstream of the transmission chain. Relative rotation can be enabled by springs arranged in series. When the torque passes, and in particular when the travel is close to 0°, there is a transfer of the lift of these springs, allowing their compression, between the first rotating torque transmission element and the second rotating torque transmission element. couple. When the rotation speeds become high, it becomes difficult to ensure the mechanical strength of the device, in particular the mechanical resistance to centrifugal forces, which leads to the risk of breakage.

The aim of the invention is to improve the torsion damping devices of the prior art by proposing such a device protected in the event of over-speed of the thermal, hybrid or electric engine, located upstream of said device.

For this purpose, the invention aims at a torsion damping device for damping the torsional oscillations of a thermal, hybrid or electric engine of a vehicle, comprising:

- a first rotating element for transmitting a torque rotating around an axis of rotation,

- a second rotating torque transmission element rotating around the axis of rotation and coupled in rotation to an output element capable of being secured in rotation to a driven shaft,

- an elastic device interposed between the first rotating element and the second rotating element, and authorizing, when it deforms, a relative rotation between the first and second rotating elements around the axis, the elastic device comprising at least one first spring , extending circumferentially between a first end and a second end, the first rotating element being movable between a rest position, in which no spring of the elastic device is compressed, and an active position in which at least one spring of the device elastic is compressed,

- a first flange comprising a compression tab arranged circumferentially between the first end of the first spring and the first rotating element,

- a second flange comprising a compression tab arranged circumferentially between the second end of the first spring and the first rotating element,

Characterized in that the first rotating element moves the first end of the first spring towards the second end of the first spring, via the compression tab of the first flange, when said first rotating element is movable in rotation in the direct direction from the position of rest,

in that the first rotating element moves the second end of the first spring towards the first end of the first spring, via the compression tab of the second flange, when said first rotating element is movable in rotation in the indirect direction from the rest position ,

and in that at least one of the first flange and the second flange is deformable between an optimal operating position, in which it has radial play with a force recovery element, and a protection position, in which it is in contact with said force recovery element,

the force recovery element being chosen from the central transmission element, the first rotating element and the second rotating element.

Thus, the first flange and/or the second flange comes into mechanical abutment against the force recovery element when they deform following high rotational speeds, for example when the engine reaches over-speed. The mechanical stop limits the deformation of the flanges and limits the stresses they undergo. This mechanical stop is only present for high rotation speeds. Thus, the functionalities of the torsion damping device are preserved in normal, or classic, engine operating mode.

The torsion damping device may include the following additional features, alone or in combination.

The first rotating transmission element is provided with a first housing.

The first spring is mounted in a first housing.

The device further comprises a third rotating element for transmitting the torque rotating around the axis of rotation, and in that the elastic device further comprises a second spring, extending circumferentially between a first end and a second end, the first spring being arranged between the first rotating element and the third rotating element so as to be elastically compressed during relative rotation between the first rotating element and the third rotating element, the second spring being arranged between the third rotating element and the second rotating element so as to be elastically compressed during relative rotation between the third rotating element and the second rotating element, the first spring and the second spring being arranged in series between the first rotating element and the second rotating element via of the third rotating element.

The compression tab of the second flange is arranged circumferentially between the second end of the second spring and the first rotating element.

The first rotating element moves the first end of the first spring towards the second end of the second spring, via the compression tab of the first flange, when said first rotating element is movable in rotation in the direct direction from the rest position,

The first rotating element moves the second end of the second spring towards the first end of the first spring, via the compression tab of the second flange, when said first rotating element is movable in rotation in the indirect direction from the rest position.

The radial clearance between at least one of the first flange and the second flange and the force recovery element is between 0.5 and 3 mm (millimeter) and preferably between 1 and 2 mm (millimeter).

The force recovery element is the first rotating element and is, for example, a veil.

The force recovery element is the second rotating element and is, for example, a veil.

The veil comprises a central body and at least one arm extending radially from said central body, and the first flange and the second flange extend between a radially internal edge and a radially external edge, the contact in the protective position being made radially between the at least one arm and the radially outer edge of the at least one of the first flange and the second flange.

The at least one arm forms a separation between the first housing and a second housing. Each arm separates two first springs.

The force recovery element is the second rotating element and is, for example, a guide washer, the first flange and the second flange extend between a radially internal edge and a radially external edge, the contact in the position of protection taking place radially between the guide washer and the radially outer edge of at least one of the first flange and the second flange.

The force recovery element is the central transmission element and is, for example, a hub, the first flange and the second flange extend between a radially internal edge and a radially external edge, the contact in the position of protection taking place radially between the hub and the radially internal edge of at least one of the first flange and the second flange.

Contact in the protective position is made after elastic deformation of at least one of the first flange and the second flange.

The invention further relates, according to another of its aspects, to a powertrain comprising a thermal, hybrid or electric engine and a device according to the invention, at least one of the first flange and the second flange being in the optimal operating position when the engine is in a normal operating mode and deforms towards the protection position when the engine is in an over-speed operating mode.

The over-speed operating mode when it is beyond its maximum rotation speed, for example from 5000 rpm (rotation per minute), preferably 6500 rpm.

In the description and the claims, the terms “compressed” or “compression”, on the one hand, and “prestressed” or “prestressed” on the other hand, when referring to springs, are used as follows:

- the preload of a spring designates the fact that this spring is mounted in a housing which is smaller than the initial length of the spring, the latter therefore exerting, through its elasticity, a force against at least one of the walls of the housing;

- the compression of a spring designates the fact that this spring is compressed by bringing together two moving parts.

The preload of a spring is therefore effective even when the torsion damping device is at rest, without any torque being transmitted. The compression of a spring only takes place during torque transmission, moving parts in relation to each other modify the configuration of the spring housing and compress it.

By “vehicle” we mean motor vehicles, which include not only passenger vehicles but also industrial vehicles, which includes in particular heavy goods vehicles, public transport vehicles or agricultural vehicles, but also any transport vehicle enabling to move a living being and/or an object from one point to another.

A preferred embodiment of the invention will now be described with reference to the appended drawings in which:

is an exploded view of a torsion damping device according to the invention;

is a partial perspective view of the torsion damping device, the first flange being in the optimal operating position, at a distance from the force recovery element, here the web;

is a partial perspective view of the torsion damping device, the first flange being in the optimal operating position, at a distance from the force recovery element, here the central transmission element;

is a partial perspective view of the torsion damping device, the first flange being in the protection position, in contact with the force recovery element, here the web;

is a partial perspective view of the torsion damping device, the first flange being in the protection position, in contact with the force recovery element, here the central transmission element;

In the description and the claims, the terms "external" and "internal" as well as the "axial" and "radial" orientations will be used to designate, according to the definitions given in the description, elements of the damping device. The rotation axis X determines the "axial" orientation. The "radial" orientation is directed orthogonal to the axis of rotation X. The "circumferential" orientation is directed orthogonal to the axis of rotation X and orthogonal to the radial direction. The terms "external" and "internal" are used to define the relative position of one component relative to another, with reference to the axis of rotation X, a component close to said axis is thus qualified as internal as opposed to an external component located radially on the periphery. Furthermore, the angles and angular sectors expressed are defined in relation to the axis of rotation X.

There represents a torsion damping device 100.

The damping device 100 may include a torque transmission torque input element and a torque transmission output element. The input element may be a first rotating element 1. The output element may be central. The output element can be a hub 5.

The input element and the output element are both rotatable around an axis X of rotation.

The device 100 may further comprise a second rotating element 2. The device 100 may further comprise a third rotating element 3. The first rotating element 1 may be rotatable around the axis X of rotation. The second rotating element 2 can be rotatable around the axis X of rotation. The third rotating element 3 can be rotatable around the axis X of rotation.

• un volant primaire formant l’élément d’entrée, i.e. le premier élément tournant 1, et apte à être relié à un arbre menant, par exemple un vilebrequin, pouvant relier le dispositif 100 à un moteur thermique, hybride ou électrique du véhicule,
• un volant secondaire formant l’élément de sortie, i.e. le moyeu 5, et apte à être relié à un arbre mené pouvant relier le dispositif 100 à une boîte de vitesse,
• une pluralité d’organes de rappel élastique montés en série entre le volant primaire et le volant secondaire.

The torsion damping device 100 may be a double damping flywheel. The latter then includes:

• a primary flywheel forming the input element, ie the first rotating element 1, and capable of being connected to a driving shaft, for example a crankshaft, capable of connecting the device 100 to a thermal, hybrid or electric engine of the vehicle,
• a secondary steering wheel forming the output element, ie the hub 5, and capable of being connected to a driven shaft capable of connecting the device 100 to a gearbox,
• a plurality of elastic return members mounted in series between the primary flywheel and the secondary flywheel.

The first rotating element 1 can be the primary flywheel.

Alternatively, the first rotating element 1 can be a disk called “sail” 7.

Alternatively, the first rotating element may be a pair of discs called "guide washers". The guide washers 9, 10 can form a cover for the device 100. A first guide washer 9 can be fixed against one side of the hub 5 while a second guide washer 10 can be fixed against an opposite side of the hub 5 .

When the first rotating element 1 is the primary flywheel or the pair of guide washers 9, 10, the second rotating element 2 can be the web 7. When the first rotating element 1 is the web 7, the second rotating element 2 can be the pair of guide washers 9, 10. In the embodiment shown in the figures, the first rotating element 1 are the guide washers 9, 10 and second rotating element 2 is the web 7.

The device 100 further comprises an elastic damping device 11 interposed between the first rotating element 1 and the second rotating element 2. The elastic device 11 is adapted so that the first rotating element 1 on the one hand, and the second rotating element 2 on the other hand, can rotate relative to each other by compressing the elastic device 11.

When the motor element rotates the first rotating element 1, the latter compresses the elastic device 11, via one of a first flange 30 and a second flange 40, which then transmits the torque to the second element rotating 2 then to the hub 5, via the other of the first flange 30 and the second flange 40. By transmitting the torque between the first rotating element 1 and the second rotating element 2, the elastic device 11, by its elastic properties, filters out acyclisms and other unwanted twisting movements.

The device 100 can operate dry.

The elastic damping device 11 comprises a plurality of springs. The plurality of springs can be held axially by the guide washers 9, 10. The plurality of springs can be held radially by the web 7 or by the guide washers 9, 10 so that they cannot escape.

The elastic damping device 11 comprises a first spring 13. The first spring 13 can be straight. Alternatively, the first spring 13 can be curved. The first spring 13 extends between a first end 131 and a second end 132.

The elastic damping device 11 may comprise a plurality of first springs 13, for example two first springs 13. The first two springs 13 may be diametrically opposed to the axis X of rotation. Alternatively, the elastic device 11 may comprise three first springs 13. The first three springs 13 may be equally distributed around the axis X.

The first rotating element 1 comprises an opening defining a housing 12. The first spring 13 can be mounted in the housing 12. The first rotating element 1 can comprise a plurality of openings defining a housing, for example an opening by first spring 13.

Each housing 12 of the first rotating element 1 has a first support zone 19 and a second opposite support zone 20.

The second rotating element 2 comprises a housing by first spring 13 to allow the mounting of said first spring(s) 13. The edges of said housings are at a distance from the first springs 13.

The first rotating element 1 and/or the second rotating element 2 may comprise a central body and several arms 6. Preferably, the second rotating element 2 comprises as many arms as first springs 13. When the first rotating element 1 and/or the second rotating element 2 comprises two arms 6, these are diametrically opposed. When the first rotating element 1 and/or the second rotating element 2 comprises three arms 6, these are equi-distributed around the axis X. Each of the arms 6 can form a separation between the housings. The first springs 13 are mounted between the arms 6.

The first rotating element 1 can be movable in rotation between a rest position, in which no first spring 13 of the elastic device 11 is compressed, and an active position in which the first springs 13 are compressed.

The device 100 further comprises the first flange 30 and the second flange 40.

The first flange 30 and the second flange 40 can be movable in rotation around the axis X of rotation.

The first flange 30 and/or second flange 40 can be deformable between an optimal position and a protective position.

The device 100 may also include a force recovery element. The force recovery element is adapted to make a mechanical stop for the first and/or the second flange when the latter become deformed. The force absorbing element may be the first rotating element 1. Alternatively, the force absorbing element may be the second rotating element 2. Alternatively, the force absorbing element may be the central element transmission.

When the first flange 30 is in the optimal position, it has a radial clearance E with the force recovery element. The radial clearance E between the first flange and the force recovery element is between 0.5 and 3 mm (millimeter) and preferably between 1 and 2 mm (millimeter). Preferably the interval between 1.3 and 1.7 mm (millimeter) gives the best results. All these values are understood, in particular, at zero rotation speed.

When the first flange 30 is in the protective position, it is in contact with the force recovery element.

The first flange 30 can be centered radially directly on the first or the second rotating element. Alternatively, the first flange 30 can be centered radially indirectly on the first or the second rotating element.

The second flange 40 can be centered radially directly on the first or the second rotating element. Alternatively, the second flange 40 can be centered radially indirectly on the first or the second rotating element.

The first flange 30 comprises at least one balancing disc 31 and at least one compression tab 32.

The balancing disk 31 can be a pressed sheet metal. The balancing disk 31 may include an interior edge 311. The balancing disk 31 may be unique. The balancing disk 31 can be in one piece. Preferably, the first flange 30 comprises two balancing disks 31. The two balancing disks can be integral in rotation with one another. The two balancing disks 31 can be strictly identical.

The compression tab 32 may comprise a support face 34 adapted to receive one of the ends of the first spring 13 in support. The compression tab 32 may further comprise a stud 35 extending radially from the support face 34 between an end secured to said bearing face and a free end. The pin 35 can be a holding element adapted to radially hold the first spring 13 when the latter is subjected to centrifugal forces. The pin 35 can also be adapted to axially retain the first spring 13. The compression tab 32 can also comprise an external edge 36 extending radially from the upper end of the bearing face 34 between an integral end of said bearing face and a free end. The edge 36 can be a holding element adapted to radially hold the first spring 13. The edge 36 can be adapted to radially hold the first spring 13 when the latter is subjected to centrifugal forces.

The inner edge 311 can form the radially inner edge of the first flange 30. The outer edge 36 of the compression tab 32 can form the radially outer edge of the first flange 30.

When the first flange 30 is in the protective position, the outer edge 36 of the compression tab 32 can be in contact with the force recovery element. The force recovery element can be the first or the second rotating element. Thus, when the first flange 30 is in the protective position, the outer edge 36 of the compression tab 32 can be in contact with the arm 6 of the first or second rotating element.

Alternatively, when the first flange 30 is in the protective position, the inner edge 311 of the balancing disk 31 can be in contact with the force recovery element. The force recovery element can be the central transmission element.

The compression tab 32 of the first flange 30 can be arranged circumferentially between the first end 131 of the first spring 13 and the first rotating element 1. More particularly, the compression tab 32 can bear against the first support zone 19 of the housing 12 of the first rotating element when the device 100 is in a rest state. This rest state of the shock absorber of the device 100 is a state in which the first rotating element 1 is in a rest position. The rest position of the first rotating element 1 is a position in which the first rotating element 1 is at a distance from the first spring 13. That is to say, the first rotating element 1 does not compress any of the first springs 13. This state rest of the shock absorber of the device 100 is a state in which the first flange 30 is in the predetermined initial position. The bearing face 34 of the compression tab 32 can bear against the first end 131 of the first spring 13.

Preferably, the first flange 30 comprises a compression tab 32 for each of the first springs 13.

The balancing disc 31 can form the compression tab 32. The compression tab 32 can have an inclined U shape. This shape is also called a suitcase corner. The shape includes a main wall, and two side walls radial to the main wall. One of the side walls can form the edge 36. The inclined U shape of the compression tab is produced by a stamping.

Alternatively, the first flange 30 may further comprise at least one end piece 37. The end piece 37 is integral with said single balancing disc 31. The end piece 37 can form the compression tab 32. The single balancing disc 31 can be made of metal. The end piece 37 can be made of plastic and is molded onto an arm of the single balancing disc 31.

Alternatively, the first flange 30 comprises two balancing discs 31 and an end piece 37. The end piece 37 is integral with said balancing discs 31. The end piece 37 can form the compression tab 32. The two balancing discs 31 can be made from stamped sheet metal. End piece 37 can be made of sintered steel. The two balancing discs are riveted together. The stamping 37 can be riveted to the two balancing discs 31.

When the second flange 40 is in the optimal position, it has a radial clearance E with the force recovery element. The radial clearance E between the first flange and the force recovery element is between 0.5 and 3 mm (millimeter) and preferably between 1 and 2 mm (millimeter). Preferably the interval between 1.3 and 1.7 mm (millimeter) gives the best results. All these values are understood, in particular, at zero rotation speed.

When the second flange 40 is in the protective position, it is in contact with the force recovery element.

The second flange 40 comprises at least one balancing disc 41 and at least one compression tab 42.

The balancing disk 41 can be a pressed sheet metal. The balancing disk 41 may include an inner edge 411. The balancing disk 41 may be unique. The balancing disk 41 can be in one piece. Preferably, the second flange 40 comprises two balancing disks 41. The two balancing disks can be integral in rotation with one another. The two balancing disks 41 can be strictly identical.

The compression tab 42 may comprise a support face 44 adapted to receive one of the ends of the first spring 13 in support. The compression tab 42 may further comprise a pin 45 extending radially from the support face 44 between an end secured to said bearing face and a free end. The pin 45 can be a holding element adapted to radially hold one of the springs. The pin 45 can be adapted to radially hold the first spring 13 when the latter is subjected to centrifugal forces. The pin 45 can also be adapted to axially retain the first spring 13. The compression tab 42 can also each comprise an external edge 46 extending radially from the upper end of the bearing face 44 between an integral end of said bearing face and a free end. The edge 46 can be a holding element adapted to radially hold the first spring 13. The edge 46 can be adapted to radially hold the first spring 13 when the latter is subjected to centrifugal forces.

The inner edge 411 can form the radially inner edge of the second flange 40. The outer edge 46 of the compression tab 32 can form the radially outer edge of the second flange 40.

When the second flange 40 is in the protective position, the outer edge 46 of the compression tab 42 can be in contact with the force recovery element. The force recovery element can be the first or the second rotating element. Thus, when the second flange 40 is in the protective position, the outer edge 46 of the compression tab 42 can be in contact with the arm 6 of the first or second rotating element.

Alternatively, when the second flange 40 is in the protective position, the inner edge 411 of the balancing disc 41 can be in contact with the force recovery element. The force recovery element can be the central transmission element.

The compression tab 42 of the second flange 40 can be arranged circumferentially between the second end 132 of the first spring 13 and the first rotating element 1. More particularly, the compression tab 42 of the second flange 40 can bear against the second support zone 20 of the housing 12 of the first rotating element 1 when the device 100 is in a rest state. In this rest state, the second flange 40 is in the predetermined initial position and the first rotating element 1 is in the rest position. The bearing face 44 of the compression tab 42 of the second flange 40 can bear, directly or indirectly, against the second end 132 of the first spring 13.

Preferably, the second flange 40 comprises a compression tab 42 for each of the first springs 13.

The balancing disc 41 can form the compression tab 42. The compression tab 42 can have an inclined U shape. This shape is also called a suitcase corner. The shape includes a main wall, and two side walls radial to the main wall. One of the side walls can form the edge 46. The inclined U shape of the compression tab is produced by a stamping.

Alternatively, the second flange 40 may also comprise at least one end piece 47. The end piece 47 is integral with said single balancing disc 41. The end piece 47 can form the compression tab 42. The single balancing disc 41 can be made of metal. The end piece 47 can be made of plastic and is overmolded on an arm of the single balancing disc 41.

Alternatively, the second flange 40 comprises two balancing discs 41 and an end piece 47. The end piece 47 is integral with said balancing discs 41. The end piece 47 can form the compression tab 42. The two balancing discs 41 can be made from stamped sheet metal. End piece 47 can be made of sintered steel. The two balancing discs are riveted together. The stamping 47 can be riveted to the two balancing discs 41.

When the first and second flanges comprise a single balancing disk we find, in the axial direction, the first flange 30, the second rotating element 2 then the second flange 40.

When the first and second flanges comprise two balancing discs, one of the balancing discs 31 of the first flange 30 and one of the balancing discs 41 of the second flange 40 are located axially on one side of the second rotating element 2, and the other of the balancing disks 31 of the first flange 30 and the other of the balancing disks 41 of the second flange 40 are located axially on the other side of the second rotating element 2.

The elastic device 11 may further comprise at least one second spring 14. The first and the second spring may be arranged circumferentially. The springs 13, 14 can be arranged in series. The second spring 14 can be straight. Alternatively, the second spring 14 can be curved. The second spring 14 extends between a first end 141 and a second end 142.

The elastic damping device 11 may comprise a plurality of second springs 14, for example two second springs 14. The two second springs 14 may be diametrically opposed to the axis X of rotation. Alternatively, the elastic device 11 may comprise three second springs 14. The three second springs 14 may be equally distributed around the axis X. Preferably, the elastic device 11 comprises as many second springs 14 as first springs 13.

Each pair of first spring 13 and second spring 14 can be mounted in one of the housings 12 of the first rotating element 1 and in one of the housings of the second rotating element 2. Each pair of first spring 13 and second spring 14 is mounted between two arm 15 of veil 7.

The device 100 may further comprise a third rotating element 3. The third rotating element 3 may be a phasing element 50 of the springs. The phasing element 50 comprises at least one spacer 51 and preferably a plurality of spacers 51. The spacer 51 can also be called a torque transfer element. The phasing element 50 can comprise as many spacers 51 as first springs 13. The spacers 51 can be mounted axially between two phasing discs 52. Each spacer 51 can be mounted circumferentially between the first spring 13 and the second spring 14 a pair of first spring 13 and second spring 14.

Each spacer 51 can include two end pieces. The two tips can be identical. The two ends can form a single piece. Each of the ends can be made of sintered steel. Each of the end pieces may include a bearing face adapted to receive one of the ends of a spring in support. Each of the end pieces may further comprise a stud extending radially from the bearing face between an end secured to said bearing face and a free end. The pin can be a holding element adapted to radially hold one of the springs. The nipple adapted to hold one of the springs radially and axially when the latter is subjected to centrifugal forces. Each of the end pieces may further comprise an external edge extending radially from the upper end of the bearing face between an end secured to said bearing face and a free end. The edge can be a holding element adapted to radially hold one of the springs.

The first end of each spacer 51 can be in contact with the second end 132 of the first spring 13 and the second end of each spacer 51 can be in contact with the first end 141 of the second spring 14.

The phasing discs 52 and each of the ends can be fixed together by rivets 53.

When the first and second flanges comprise a single balancing disk we find, in the axial direction, one of the phasing disks 52, the first flange 30, the second rotating element 2, the second flange 40 then the other of the phasing disks 52 of the third rotating element 3.

When the first and second flanges comprise two balancing disks, one of the phasing disks 52, one of the balancing disks 31 of the first flange 30 and one of the balancing disks 41 of the second flange 40 are located axially on one side of the second rotating element 2, and the other of the balancing discs 31 of the first flange 30, the other of the balancing discs 41 of the second flange 40 and the other of the discs phasing 52 of the third rotating element 3 are located axially on the other side of the second rotating element 2.

The torsion damping device 100 may further comprise a torque limiter adapted to exert friction. The torque limiter is adapted to, in normal operation, transmit a torque by rotating around the axis of rotation and to limit this transmission when this torque exceeds a certain value.

The figures show the device 100 in the rest state, that is to say when it transmits no torque, the springs not being loaded. Each first and second spring 13, 14 is mounted, at one of its ends, in a compression tab 32, 42 and, at the other of its ends, against one of the spacers 51. Each compression tab 32, 42 is supported only on the first rotating element 1. Thus, each pair of first and second spring 13, 14 is mounted between one of the compression tabs 32 of the first flange 30, which rests for example only on the first support zone 19 of the housing 12 of the first rotating element 1, and one of the compression tabs 42 of the second flange 40, which rests for example only on the second support zone 20 of the housing 12 of the first rotating element 1.

The angle of attack of at least one of the springs 13, 14 by one of the compression tabs can have a value between 0 and 20° (degrees).

The springs 13, 14 are thus, in pairs, pre-stressed between the first support zones 19 and the second support zones 20. Between the springs 13, 14 of each pair, the spacer 51, movable in rotation around the The axis .

The angular rest position is the initial position from which:

- a first torque polarity defined by the fact that the first rotating element 1 is in an angular position, relative to the second rotating element 2, which is located in an angular sector included between the predetermined initial position, also called angular position of rest, in which the first rotating element 1 is in the rest position, and an end position where the first rotating element 1 is in the active position, that is to say rotated as much as possible in the direct direction, until to a stop;

- a second torque polarity defined by the fact that the first rotating element 1 is in an angular position, relative to the second rotating element 2, which is located in an angular sector included between the predetermined initial position, also called angular position of rest, in which the first rotating element 1 is in the rest position, and an end position where the first rotating element 1 is in the active position, that is to say turned as much as possible in the indirect direction, until at a stop.

These two torque polarities correspond to two operating modes of the torsion damping device 100:

- a mode where the torque is transmitted from the central torque transmission element to the peripheral torque transmission element, corresponding for example, in a vehicle, to a transmission of torque from the wheels to the engine (engine braking phases , for example) commonly called “retro mode”, this corresponds to the second torque polarity;

- a mode where the torque is transmitted from the peripheral torque transmission element to the central torque transmission element, corresponding for example, in a vehicle to a transmission of torque from the engine to the wheels (acceleration phases, for example) commonly called “direct mode”, this corresponds to the first torque polarity.

When the device 100 is in the first torque polarity, the first rotating element 1 has rotated, relative to the angular position of rest, in the direct direction (arrow D) to an end position. In this position, the springs 13, 14 are compressed between the first support zones 19 of the first rotating element 1 and the compression tabs 42 of the second flange 40.

When the device 100 is in the second torque polarity, the first rotating element 1 has now rotated, relative to the angular position of rest, in the indirect direction (arrow I) to an end position. In this position, the springs 13, 14 are compressed between the second support zones 20 of the first rotating element 1 and the compression tabs 32 of the first flange 30.

In another alternative embodiment, the device 100 does not include a veil 7.

In this alternative embodiment, the hub 5 is coupled to the first flange 30 and to the second flange 40 and said flanges can form the second rotating element 2. Thus, the torque is transmitted directly between the second flange 40 and the hub 5 when the device 100 rotates in the direct direction and is transmitted directly between the first flange 30 and the hub 5 when the device 100 rotates in the indirect direction.

More particularly, the first flange 30 can form the second rotating element 2 when the first rotating element 1 is movable in rotation in the indirect direction relative to the angular rest position. The second flange 40 can form the second rotating element 2 when the first rotating element 1 is movable in rotation in the direct direction relative to the angular rest position.

Thus, when the device 100 is in the first torque polarity, the first rotating element 1 has rotated, relative to the angular position of rest, in the direct direction (arrow D) to an end position. In this position, the springs 13, 14 are compressed between the first support zones 19 of the first rotating element 1 and the compression tabs 42 of the second flange 40.

When the device 100 is in the second torque polarity, the first rotating element 1 has now rotated, relative to the angular position of rest, in the indirect direction (arrow I) to an end position. In this position, the springs 13, 14 are compressed between the second support zones 20 of the first rotating element 1 and the compression tabs 32 of the first flange 30.

Other alternative embodiments of the torsion damping device 100 can be implemented without departing from the scope of the invention. For example, the system in which the torsion damping device is mounted may be any system within a torque transmission chain which requires torsion damping, such as a clutch disc.

Claims (11)

Torsion damping device (100) for damping the torsional oscillations of a thermal, hybrid or electric engine of a vehicle, comprising:
- a first rotating element (1) for transmitting a torque rotating around an axis (X) of rotation,
- a second rotating element (2) for transmitting the torque rotating around the axis (X) of rotation and coupled in rotation to an output element (5) capable of being secured in rotation to a driven shaft,
- an elastic device (11) interposed between the first rotating element (1) and the second rotating element (2), and allowing, when it deforms, a relative rotation between the first (1) and second (2) rotating elements around the axis (X), the elastic device (11) comprising at least a first spring (13), extending circumferentially between a first end (131) and a second end (132), the first rotating element (1 ) being movable between a rest position, in which no spring of the elastic device (11) is compressed, and an active position in which at least one spring of the elastic device is compressed,
- a first flange (30) comprising a compression tab (32) arranged circumferentially between the first end (131) of the first spring (13) and the first rotating element (1),
- a second flange (40) comprising a compression tab (42) arranged circumferentially between the second end (132) of the first spring (13) and the first rotating element (1),
Characterized in that the first rotating element (1) moves the first end (131) of the first spring (13) towards the second end (132) of the first spring, via the compression tab of the first flange (30), when said first rotating element (1) is movable in rotation in the direct direction from the rest position,
in that the first rotating element (1) moves the second end (132) of the first spring (13) towards the first end of the first spring, via the compression tab of the second flange (40), when said first rotating element ( 1) is movable in rotation in the indirect direction from the rest position,
and in that at least one of the first flange (30) and the second flange (40) is deformable between an optimal operating position, in which it has a radial clearance () with a force recovery element, and a protective position, in which it is in contact with said force recovery element,
the force recovery element being chosen from the central transmission element (5), the first rotating element (1) and the second rotating element (2). Device (100) according to the preceding claim, characterized in that the device (100) further comprises a third rotating element (3) for transmitting the torque rotating around the axis (X) of rotation, and
in that the elastic device (11) further comprises a second spring (14), extending circumferentially between a first end (141) and a second end (142), the first spring (13) being arranged between the first element rotating element (1) and the third rotating element (3) so as to be elastically compressed during relative rotation between the first rotating element (1) and the third rotating element (3), the second spring (14) being arranged between the third rotating element (3) and the second rotating element (2) so as to be elastically compressed during relative rotation between the third rotating element (3) and the second rotating element (2), the first spring (13) and the second spring (14) being arranged in series between the first rotating element (1) and the second rotating element (2) via the third rotating element (3). Device (1) according to claim 1 or claim 2, characterized in that the radial clearance () between at least one of the first flange (30) and the second flange (40) and the recovery element effort is between 0.5 and 3 mm (millimeter) and preferably between 1 and 2 mm (millimeter). Device (1) according to any one of claims 1 to 3, characterized in that the force recovery element is the first rotating element (1) and is, for example, a veil. Device (1) according to any one of claims 1 to 3, characterized in that the force recovery element is the second rotating element (2) and is, for example, a veil. Device (1) according to any one of the two preceding claims, characterized in that the veil comprises a central body () and at least one arm (6) extending radially from said central body, and in that the first flange (30) and the second flange (40) extend between a radially internal edge () and a radially external edge (), the contact in the protective position being made radially between the at least one arm (6) and the edge radially externally of at least one of the first flange (30) and the second flange (40). Device (1) according to any one of claims 1 to 3, characterized in that the force recovery element is the second rotating element (2) and is, for example, a guide washer, the first flange ( 30) and the second flange (40) extend between a radially internal edge () and a radially external edge (), the contact in the protective position being made radially between the guide washer and the radially external edge of the other at least one of the first flange (30) and the second flange (40). Device (1) according to any one of claims 1 to 3, characterized in that the force recovery element is the central transmission element (5) and is, for example, a hub, the first flange ( 30) and the second flange (40) extend between a radially internal edge () and a radially external edge (), the contact in the protective position being made radially between the hub and the radially internal edge of the at least one among the first flange (30) and the second flange (40). Device (1) according to any one of the preceding claims, characterized in that the contact in the protection position is made after elastic deformation of at least one of the first flange (30) and the second flange (40). Powertrain comprising a thermal, hybrid or electric engine and a device (1) according to any one of the preceding claims, characterized in that at least one of the first flange (30) and the second flange (40) is in the optimal operating position when the engine is in a normal operating mode and deforms towards the protection position when the engine is in an over-speed operating mode. Powertrain according to the preceding claim, in which the over-speed operating mode is from 5000 rpm (rotation per minute).