FR3130338A1 - TORSION DAMPING DEVICE - Google Patents

Abstract

TORSION DAMPING DEVICE Torsion damping device (100), comprising a torsion oscillation damper (200) and a torque limiter (4) adapted to exert friction, the torsional oscillation damper comprising: - a first rotating element (1) for transmitting the torque rotating around an axis (X) of rotation, - a second rotating element (2), - a third rotating element (3), - an elastic device (11) comprising a first spring (13) and a second spring (14) in series between the first rotating element (1) and the second rotating element (2) via the third rotating element (3) , the first spring (13) being arranged between the first rotating element (1) and the third rotating element (3) and the second spring (14) being arranged between the third rotating element (3) and the second rotating element (2) , wherein the second rotating element (2) is rotatably coupled to an output element (5), and in which the torque limiter (9) is integral in rotation with the output element (5). Figure for abstract: Figure 2

Description

TORSION DAMPING DEVICE

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

Motor vehicles generally include such torsion damping devices which can be integrated into various elements of the transmission chain. For example, a dual mass flywheel flywheel, clutch disc, or torque limiter may include a torsional damping device to filter out engine acyclisms and other torsional oscillations. This filtering is typically carried out by one or more torsion dampers which are combined spring-dampers 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. The relative rotation may be permitted by springs arranged in series. During the passage of the torque, 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 element for transmitting torque and the second rotating element for transmitting torque. couple. In addition, such an architecture includes a torque limiter located at the input and radially above the torsion damping device.

This architecture makes it possible to obtain a satisfactory damping of the torsional oscillations by the device but presents a significant inertia downstream of the torque limiter, which leads to strong overtorques in the transmission chain, in particular on hybrid vehicles. In addition, such an architecture is bulky, and is difficult to assemble and maintain.

The invention aims to improve this type of device.

To this end, the invention relates to a device for damping torsional oscillations, for a vehicle transmission chain, comprising a torsional oscillation damper and a torque limiter adapted to exert friction,
The torsional oscillation damper including:
- a first rotating element for transmitting the torque rotating around an axis of rotation,
- a second rotating element for transmitting the torque rotating around the axis of rotation,
- a third rotating element for transmitting the torque rotating around the axis of rotation,
- an elastic device comprising a first spring the first spring, comprising a first end and a second opposite end, and a second spring, comprising a first end and a second opposite end, the first spring being arranged between the first rotating element and the third rotating element so as to be elastically compressed during a relative rotation between the first rotating element and the third rotating element and the second spring being arranged between the third rotating element and the second rotating element so as to be elastically compressed during a 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 the third rotating element,
in which the second rotating element is coupled in rotation to an output element adapted to be fixed in rotation to a driven shaft,
and in which the torque limiter is integral in rotation with the output element.

The torque limiter is suitable for, in normal operation, transmitting a torque by rotating around the axis of rotation and for limiting this transmission when this torque exceeds a certain value.

The torque limiter is thus located as close as possible to the gearbox, which makes it possible to limit the inertia downstream of the torque limiter and therefore to limit the arrival of overtorque at the output of the torque limiter, i.e. that is to say in the components of the transmission chain located between said torque limiter and the wheels of the vehicle.

This architecture also makes it possible to obtain a particularly satisfactory damping of torsional oscillations by the device because the springs can in particular be located on a larger radius.

Thus, the torsion damping device according to the invention is particularly efficient for a limited bulk. The architecture of this device is suitable for all vehicles, and is particularly suitable for the transmission chains of hybrid engines. It also has a reduced manufacturing cost.

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

The elastic device is interposed between the first rotating element and the second rotating element, and allows, when it deforms, a relative rotation around the axis of rotation between the first and the second rotating element.

The torque limiter is directly integral in rotation with the output element. Thus there is no intermediate part between the torque limiter and the output element. This limitation of the number of parts of the device makes it possible to reduce the size and the cost of the latter.

The torque limiter is a dry torque limiter. The torque limiter is positioned outside of any space containing lubricant, such as grease. This positioning of the torque limiter allows dry friction with organic linings and a spring Belleville washer allowing perfect operating control of the sliding torque with a minimum of axial bulk.

The elastic device operates in a dry environment. The operation of the elastic device in a dry environment, i.e. not comprising any lubricant, makes it possible to arrange said elastic device in the same environment as the torque limiter. This solution makes it possible to limit the overall size of the torsion damping device. This solution also makes it possible to simplify the architecture and the assembly of the device because it does not require elements ensuring sealing.

The first rotating element is 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 elastic device is compressed,
The torsional oscillation damper further comprising:
- a first bearing seat disposed at the first end of the first spring, on the one hand between the first rotating element and the first spring to transfer the torque between the first rotating element and the first spring when said first rotating element is movable in rotation in the forward direction from the rest position, on the other hand between the second rotating element and the first spring to transfer the torque between the first spring and the second rotating element when said first rotating element is rotatable in the indirect direction from the rest position, and
- a second bearing seat disposed at the second end of the second spring, on the one hand between the first rotating element and the second spring to transfer the torque between the first rotating element and the second spring when said first rotating element is movable in rotation in the indirect direction from the rest position, on the other hand between the second rotating element and the second spring to transfer the torque between the second spring and the second rotating element when said first rotating element is rotatable in the forward direction from the rest position,
And wherein the third rotating member includes a spacer directly transferring torque between the first spring and the second spring.

In other words, the torsional oscillation damper has no bearing seat attached between, on the one hand, the spacer of the third rotating element and the first spring, and, on the other hand, between the spacer of the third rotating element and the second spring.

The insert is directly in contact with the first spring and with the second spring.

Thus, this solution makes it possible to obtain both quality damping while limiting the wear of the springs. On the one hand, friction and dynamic hysteresis between the springs and the first and second rotating elements are limited. On the other hand, the angular movement is not limited by the presence of a seat at each end of the spring.

The direct direction is the trigonometric direct direction, also called anti-clockwise direction. The indirect direction is the trigonometric indirect direction, also called clockwise. The direct meaning is opposed to the indirect meaning.

The first rotating element is 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 elastic device is compressed,
The torsional oscillation damper further comprising:
- a first flange comprising a
compression lug arranged circumferentially between the first end of the first spring and the first rotating element,
- a second flange comprising a compression lug arranged circumferentially between the second end of the second spring and the first rotating element,
wherein 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 rotatable in the forward direction from the rest position,
and wherein 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 rotationally movable in the indirect direction from the position of rest .

This architecture allows the suppression of the transfer of lift during the transmission of torque, which makes it possible to reduce the wear of the springs, or of the parts in contact with said springs, and noise during operation of the device. Suppressing lift transfer further reduces or even eliminates radial friction for optimal damping performance. The presence of a first and a second flange guiding the springs allows the first and the second rotating element to transmit only the torque without retaining the springs, or any intermediate element between the first rotating element and the at least one spring. This makes it possible in particular to standardize the first rotating element. This also makes it possible to reinforce the resistance of said first rotating element.

In addition, the first flange and the second flange do not oppose any reaction to the transmission of the torque passage. Thus, the dimensioning of said flanges is simpler to achieve and the latter are less expensive to manufacture.

The third rotating element comprises a spacer directly transferring the torque between the first spring and the second spring.

The second rotating element is a veil or a guide washer.

The second rotating element is the first flange when the first rotating element is rotatable in the indirect direction from the rest position, or is the second flange when the first rotating element is rotatable in the forward direction from the rest position . This architecture makes it possible to reduce the number of parts constituting the torsional oscillation damper and therefore to limit its size and manufacturing cost.

The torque limiter is radially closer to the axis of rotation than the elastic device. This makes it possible to obtain a more compact device axially.

The second rotating element forms the input part of the torque limiter. Thus, the number of parts is reduced and the overall size of the device is reduced.

The torque limiter comprises a friction device integral in rotation with the second rotating element of the torsional oscillation damper.

The torque limiter further comprises a drive plate and/or a cover, one of these elements being integral in rotation with the output element.

The friction device of the torque limiter comprises a disc, formed by the second rotating element of the torsional oscillation damper, and a friction element located axially between the disc and the cover or between the disc and the plate of coaching. Thus, the number of parts constituting the device is limited.

The torque limiter further comprises an elastic element. The elastic element is prestressed to exert a load.

The friction element is formed by a lining and/or paper and/or a friction coating.

The torque limiter further comprises an inner ring integral in rotation with the output element, the friction device of the torque limiter being adapted to exert radial pressure on the inner ring. Thus, the torque limiter is of the radial type, which makes it possible to limit the axial size of the device.

The output element forms the inner ring. Thus, the number of parts of the device is limited and its size is reduced.

The torque limiter includes an outer ring. The outer ring is formed by the second rotating element of the torsional oscillation damper. Thus, the number of parts of the device is limited and its size is reduced.

The torque limiter comprises an elastic component located radially between the inner ring and the friction device, more particularly between the inner ring and the outer ring. This elastic component makes it possible to better control the tightening and the sliding torque of the torque limiter.

The torque limiter has an axial dimension smaller than the axial dimension of the torsional oscillation damper. This ratio is an optimum to manage the size of the device.

The device further comprises a hysteresis system located axially between the torque limiter and the torsional oscillation damper. The hysteresis system improves the filtration of thermal engine acyclisms. The hysteresis system allows the primary part (connected to the motor) to be positioned axially with respect to the secondary part (connected to the gearbox).

The hysteresis system includes two friction washers and a spring washer. The spring washer is suitable for axially preloading the hysteresis system. The first friction washer is located axially between the cover of the torque limiter and the first rotating element. The second friction washer is located axially between the drive plate and the first rotating element.

The friction washers are plastic.

The hysteresis system comprises at least one component adapted to radially and/or axially center the third rotating element, the first flange and/or the second flange. More particularly, the friction washers of the hysteresis system are adapted to radially and/or axially center the third rotating element and/or the first flange and/or the second flange. The centering is carried out without play or with little play. Thus, parasitic friction is limited.

The first rotating element is a primary flywheel. A cover is attached to the primary flywheel.

The invention further relates, according to another of its aspects, to a hybrid vehicle transmission chain comprising a torsion damping device according to the invention.

Finally, the subject of the invention, according to another of its aspects, is a vehicle powertrain comprising: an electric motor and/or a heat engine and an electric motor for propelling the vehicle, and a torsion damping device according to 'invention.

In the description and the claims, the terms "compressed" or "compression", on the one hand, and "prestressed" or "prestressed" on the other hand, when they refer 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, by 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, it, takes place only during torque transmission, moving parts relative to each other, modify the configuration of the spring housing and compress it.

"Vehicle" means 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 allowing 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 accompanying drawings in which:

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

is a partial perspective view of the torsion damping device of the ;

is a partial sectional view of the torsion damping device of the ;

is a sectional view of the torsion damping device according to a second embodiment of the torque limiter.

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 axis of rotation X determines the "axial" orientation. The "radial" orientation is directed orthogonally to the X axis of rotation. The "circumferential" orientation is directed orthogonal to the X axis of rotation and orthogonal to the radial direction. The terms "external" and "internal" are used to define the relative position of a component with respect 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. Moreover, 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 can be a first rotating element 1. The output element can be central. The output element can be a hub 5.

• un volant primaire 6 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 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 6 et le volant secondaire.

The torsion damping device 100 may be a dual mass flywheel. This then includes:

• a primary flywheel 6 forming the input element, ie the first rotating element 1, and capable of being connected to a driving shaft, for example a crankshaft, which can connect the device 100 to a hybrid or electric motor of the vehicle,
• a secondary flywheel forming the output element, ie the hub 5, and able to be connected to a driven shaft able to connect the device 100 to a gearbox,
• a plurality of elastic return members mounted in series between the primary flywheel 6 and the secondary flywheel.

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

The device 100 may include a torsional oscillation damper 200. The torsional oscillation damper 200 may include the first rotating element 1 and a second rotating element 2. The torsional oscillation damper 200 may further comprise a third rotating element 3. The first rotating element 1 can be rotatable around the X axis of rotation. The second rotating element 2 can be rotatable around the X axis of rotation. The third rotating element 3 can be rotatable around the X axis of rotation.

The first rotating element 1 can be the primary flywheel 6. Alternatively, the first rotating element 1 can be a disk called “sail” 7. Alternatively, the first rotating element can be a pair of disks called “guide washers”.

When the first rotating element 1 is the primary flywheel 6 or the pair of guide washers, the second rotating element 2 can be the veil 7. When the first rotating element 1 is the veil 7, the second rotating element 2 can be the pair guide washers. In the embodiment shown in Figures 1 to 4, the first rotating element 1 is the primary flywheel 6 and the second rotating element 2 is the veil 7.

The torsional oscillation damper 200 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 undesirable twisting movements.

The Torsion Oscillation Damper 200 can run dry.

The elastic damping device 11 comprises a plurality of springs. The plurality of springs can be held axially by the primary flywheel 6 and by a protective cover 8 and radially by the primary flywheel 6 and the veil 7 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 two first springs 13 may be diametrically opposed with respect to the axis X of rotation. Alternatively, the elastic device 11 can comprise three first springs 13. The three first springs 13 can be evenly 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 one opening per 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 per first spring 13 to allow the mounting of said first spring or springs 13. The edges of said housings are at a distance from the first springs 13.

The second rotating element 2 comprises several arms 15. The second rotating element 2 preferably comprises as many arms as there are first springs 13. When the second rotating element 2 comprises two arms 15, these are diametrically opposed. When the second rotating element 2 comprises three arms 15, these are evenly distributed around the axis X. Each of the arms 15 can form a separation between the housings. The first springs 13 are mounted between the arms 15.

The first rotating element 1 can be rotatable 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 torsional oscillation damper 200 further includes the first flange 30 and the second flange 40.

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

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 leg 32.

The balancing disc 31 can be a stamped sheet. The balancing disk 31 can be unique. The balancing disc 31 can be one-piece. Preferably, the first flange 30 comprises two balancing discs 31. The two balancing discs can be integral in rotation with one another. The two balancing discs 31 can be strictly identical.

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

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 bearing zone 19 of the housing 12 of the first rotating element when the torsional oscillation damper 200 is in a state of rest. This rest state of the torsional oscillation damper 200 is a state in which the first rotating member 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 that the first rotating element 1 does not compress any of the first springs 13. This state rest of the torsional oscillation damper 200 is a state in which the first clamp 30 is in the predetermined initial position. The bearing surface 34 of the compression lug 32 can bear against the first end 131 of the first spring 13.

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

The balancing disc 31 may form the compression tab 32. The compression tab 32 may have an inclined U-shape. This shape is also called 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 made by 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 may form the compression lug 32. The single balancing disc 31 can be made of metal. The tip 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 lug 32. The two balancing discs 31 can be made in a stamped sheet. The tip 37 can be made of sintered steel. The two balancing discs are riveted together. Stamping 37 can be riveted to the two balancing discs 31.

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

The balancing disc 41 can be a stamped sheet. The balancing disk 41 can be unique. The balancing disk 41 can be one-piece. Preferably, the second flange 40 comprises two balancing discs 41. The two balancing discs can be integral in rotation with one another. The two balancing discs 41 can be strictly identical.

The compression tab may comprise a bearing face 44 adapted to receive one of the ends of the first spring 13 in abutment. The compression tab may further comprise a stud 45 extending radially from the bearing face 44 between one end integral with said bearing face and one free end. The pin 45 can be a holding element suitable for radially holding 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 stud 45 can also be adapted to retain the first spring 13 axially. The compression tab can also each comprise an outer edge 46 extending radially from the upper end of the bearing face 44 between an end integral with 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 compression lug 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 lug of the second flange 40 can bear against the second zone of support 20 of the housing 12 of the first rotating element 1 when the torsional oscillation damper 200 is in a state of rest. In this state of rest, 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 lug 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 includes a compression tab for each of the first springs 13.

The balancing disc 41 can form the compression tab. The compression tab may have an inclined U-shape. This shape is also called 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 made by stamping.

Alternatively, the second flange 40 can further 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 leg. The single balancing disc 41 can be made of metal. The tip 47 can be made of plastic and is molded onto 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. The two balancing discs 41 can be made from stamped sheet metal. The tip 47 can be made of sintered steel. The two balancing discs are riveted together. Stamping 47 can be riveted to the two balancing discs 41.

When the first and second flanges comprise a single balancing disc, there is, 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 discs 31 of the first flange 30 and the other of the balancing discs 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 with respect to the axis X of rotation. Alternatively, the elastic device 11 can comprise three second springs 14. The three second springs 14 can be evenly 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 torsional oscillation damper 200 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 there are first springs 13. In the embodiment represented in FIGS. 1 to 3, the phasing element 50 comprises three spacers 51. 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 of 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 end pieces can form a one-piece piece. Each of the end pieces 53 can be made of sintered steel. Each of the end pieces 53 can comprise a support surface adapted to receive in support one of the ends of a spring. Each of the end pieces 53 may further comprise a pin extending radially from the bearing face between an end integral with said bearing face and a free end. The pin can be a holding element suitable for radially holding one of the springs. The pin adapted to hold one of the springs radially and axially when the latter is subjected to centrifugal forces. Each of the end pieces 53 may further comprise an outer edge 56 extending radially from the upper end of the bearing face between an end integral with said bearing face and a free end. The edge 56 can be a holding element adapted to radially hold one of the springs.

The first end piece 53 of each spacer 51 can be in contact with the second end 132 of the first spring 13 and the second end piece 53 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 end pieces 53 can be fixed together by rivets 57.

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

When the first and second flanges comprise two balancing discs, one of the phasing discs 52, 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 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 further comprises a torque limiter 9. The torque limiter 9 may be located between the torsion oscillation damper 200 and the hub 5 in the direction of torque transmission. The torque limiter 9 is radially closer to the hub 5 than the torsional oscillation damper 200.

As depicted at , the torque limiter 9 can be of the axial type. The torque limiter 9 includes a friction device. The friction device of the torque limiter 9 may comprise at least one friction element 91 and a disk 92 fixed in rotation to the second rotating element 2 at the output of the torsional oscillation damper 200. The friction element 91 may be a friction lining. Alternatively or in addition, the friction element 91 can be paper. Alternatively or in addition, the friction element 91 can be a friction coating. The friction element 91 can be fixed on the disc 92. Alternatively, the friction element 91 can be fixed on at least one of the covers 93 and/or on a drive plate 94 of said torque limiter 9.

The torque limiter 9 is radially aligned with the torsional oscillation damper 200 and the disc 92 of the torque limiter 9, plane, is fixed to the second rotating element 2 by a plurality of rivets. Alternatively, the disc 92 and the second rotating element are combined. Thus, in the example shown, the veil 7 forms the second rotating element of the torsional oscillation damper 200 and the disc 92 of the torque limiter 9.

Positioning the torque limiter 9 outside of a space containing grease makes it possible to have a torque limiter 9 dry. The dry torque limiter 9 allows dry friction with the organic friction elements 91 to obtain perfect operating control of the sliding torque with a minimum of axial bulk of the torque limiter 9.

Two friction element 91 in the form of an annular disc with axis X of rotation are arranged on either side of the disc 92 of the torque limiter (a friction element 91 on each side - the friction elements 91 and the disc 92 having flat facing surfaces perpendicular to the X axis). The friction elements 91 can be fixed on this disc 92, for example by a plurality of rivets. Alternatively, the friction elements 91 can be fixed on at least one of the covers 93 and on the drive plate 94 for example by a plurality of rivets.

The torque limiter 9 further comprises two concentric X-axis drive covers 93. The two covers 93 can be integral in rotation with each other and the drive plate 94 can rotate around the X axis , able to move axially, can be arranged between the two covers 93 and integral in rotation with these two covers 93.

The friction elements 91 are interposed between the drive plate 94 and one of the covers 93 so that they rest permanently on one side of one of the covers 93 and on one side of the drive plate 94.

In the event of overtorque applied to the torque limiter 9, the friction elements 91 are arranged to be able to slide in rotation relative to the cover 93 and to the drive plate 94 on which they rest. Alternatively, when the friction elements 91 are integral in rotation with one of the covers 93 and the drive plate 94, they are arranged to be able to slide in rotation relative to the disc 92 on which they rest in the event of overtorque. applied to torque limiter 9.

An elastic element 95 can be interposed axially between the other of the two covers 93 and the drive plate 94. The elastic element 95 can be in the form of an annular disc with axis X of revolution. That is to say that its axis of revolution can be confused with the axis X of rotation.

The elastic element 95 can rest on the face of the drive plate 94 opposite the face of this drive plate on which the friction element 91 rests. The elastic element 95 can be a Belleville washer .

The elastic element 95 keeps the drive plate 94 in contact with the friction elements 91, despite the wear of these elements. The elastic element 95 is prestressed so as to permanently exert a predetermined axial pressure on the drive plate 94 allowing the pinching of the friction elements 91 between this drive plate 94 and the cover 93. When the elastic element 95 is at rest, it exerts insufficient axial pressure on the drive plate 94 not allowing the pinching of the friction elements 91 between this drive plate 94 and the cover 93. The friction elements 91 are then free to slide in rotation relative to the cover 93 even without overtorque.

The two covers 93 therefore frame the friction elements 91 and the disc 92 and, when approaching the X axis, these two covers 93 approach each other until they are in contact. At this contact zone, a plurality of connecting members makes it possible to secure the two covers 93. Each member of the plurality of connecting members can be a screw or a rivet and is adapted to pre-stress the elastic element 95 so as to exert the predetermined axial pressure on the friction device and more particularly on the at least one friction element 91 and the disc 92.

The two covers 93 are therefore secured radially below the elastic element 95 - that is to say closer to the X axis of rotation - and axially at the same level. The two covers 93 are fixed in rotation to the hub 5. More particularly, the hub 5 can form one of the covers 93 of the torque limiter 9. This thus makes it possible to obtain a device 100 that is compact axially and to achieve cost savings. (fewer parts to manufacture) and assembly time.

Thus, in the example considered, the torque is transmitted from the primary flywheel 6 to the torsional oscillation damper 200 then, via the veil 7 forming the second rotating element 2 and the disc 92, to the limiter torque 9 itself secured to the hub 5 output.

The torque limiter 9 may have a general axial bulk smaller than the general axial bulk of the torsional oscillation damper 200.

Alternatively, and as shown in , the torque limiter 9 can be of the radial type. The torque limiter 9 may comprise an inner ring 96 and an outer ring 97. Friction is radial friction produced between the two rings. The inner ring 96 can be integral with the hub 5. More particularly, the hub 5 can form the inner ring 96. The outer ring 97 forms the disk 92 of the friction device of the torque limiter. The outer ring 97 can be integral with the second rotating element 2. More particularly, the second rotating element 2 can form the outer ring 97.

The torsion damping device 100 may further comprise a hysteresis system 60, also called a friction system. The hysteresis system 60 is intended to dissipate part of the energy of the springs 13, 14, to avoid the phenomena of excessive oscillations and makes it possible to improve the filtration of the acyclisms of the heat engine. The hysteresis system 60 also makes it possible to position the primary part (connected to the motor) axially with respect to the secondary part (connected to the gearbox). The hysteresis system 60 can be located axially between the torque limiter 9 and the torsion oscillation damper 200. The hysteresis system 60 can comprise two friction washers 61 and an elastic washer. The elastic washer is adapted to axially preload the hysteresis system 60. One of the friction washers 61 can be located axially between one of the covers 93 of the torque limiter 9 and the first rotating element 1. The other of the friction washers 61 can be located axially between the drive plate 94 of the torque limiter 9 and the first rotating element 1.

The friction washers 61 can be made of plastic.

The friction washers 61 can be adapted to radially and/or axially center the third rotating element 3 and/or the first flange 30 and/or the second flange 40. The centering can be achieved with a small clearance. Alternatively, the centering can be made without play. Thus, parasitic friction is limited.

The figures show the device 100 in the rest state, that is to say when it does not transmit any torque, the springs not being stressed. Each first and second spring 13, 14 is mounted, at one of its ends, in a compression tab 32 and, at the other of its ends, against one of the inserts 51. Each compression tab 32 is supported only on the first rotating element 1. Thus, each pair of first and second springs 13, 14 is mounted between one of the compression lugs 32 of the first flange 30, which bears for example only on the first bearing zone 19 of the housing 12 of the first rotating element 1, and one of the compression lugs 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, prestressed 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 axis X, thanks to the phasing discs 52, ensures the series connection of the springs 13, 14 of a pair, as well as the phasing, that is to say the angular coordination, of a pair with the other or the others .

The angular position of rest is the initial position from which are characterized:

- 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 between the predetermined initial position, also called the angular position of rest, in which the first rotating element 1 is in the rest position, and an end-of-travel position where the first rotating element 1 is in the active position, that is to say turned as far as possible in the forward direction, up to a abutment;

- 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 between the predetermined initial position, also called the angular position of rest , in which the first rotating element 1 is in the rest position, and an end-of-travel position where the first rotating element 1 is in the active position, that is to say turned to the maximum in the indirect direction, until a setting in abutment.

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

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

- a mode in which the torque is transmitted from the peripheral torque transmission element to the central torque transmission element, corresponding for example, in a vehicle, to transmission of the torque from the engine to the wheels (acceleration phases, for example) commonly referred to as "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-of-travel 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 lugs 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-of-travel 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 lugs 32 of the first flange 30.

In an alternate embodiment, the torsional oscillation damper 200 does not include a first flange 30 or a second flange 40.

In this alternative embodiment, the torsional oscillation damper 200 may comprise at least a first support seat and at least a second support seat. Preferably, the shock absorber may comprise a plurality of first and second support seats. More particularly, the torsion oscillation damper 200 can comprise as many first support seats as first spring 13 and as many second support seats as second spring 14.

Each of the first bearing seats is arranged circumferentially between the first end 131 of the first spring 13 and the first rotating element 1. Each of the second bearing seats is arranged circumferentially between the second end 142 of the second spring 14 and the first rotating element 1.

The first and second support seats are made with plastic, for example polyamide or PEEK. The first and second seats can be filled with fibers, for example glass fibers or carbon fibers.

The first support seat and the second support seat may have a cover covering radially respectively the first end 131 of the first spring 13 and the second end 142 of the second spring 14, the covers of the first seat and of the second seat comprising each of the axial guide ribs capable of cooperating with the first rotating element 1 and with the second rotating element 2.

The first seat may include a first bearing surface against which the first end 131 of the first spring 13 bears. The first seat may include a second bearing surface, opposite the first bearing surface, resting, in the rest position, against the first bearing zone 19 of the housing 12 of the first rotating element 1 and against the first bearing zone of the housing of the second rotating element 2.

The second seat may include a second bearing surface against which the second end 142 of the second spring 14 bears. The second seat may include a second bearing surface, opposite the first bearing surface, resting, in the rest position, against the second bearing zone 20 of the housing 12 of the first rotating element 1 and against the second bearing zone of the housing of the second rotating element 2.

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-of-travel position. In this position, the springs 13, 14 are compressed between the first seats pushed by the first support zones 19 of the first rotating element 1 and the second seats.

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-of-travel position. In this position, the springs 13, 14 are compressed between the second seats pushed by the second support zones 20 of the first rotating element 1 and the first seats.

In another alternative embodiment, the torsional oscillation damper 200 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 rotatable in the indirect direction with respect to the angular position of rest. The second flange 40 can form the second rotating element 2 when the first rotating element 1 is rotatable in the direct direction with respect to the angular position of rest.

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-of-travel 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 lugs 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-of-travel 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 lugs 32 of the first flange 30.

Other variant 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 torsional damping device is mounted can be any system within a torque transmission chain that requires torsional damping, such as a clutch disc.

Claims (13)

Torsion damping device (100) for a vehicle transmission chain, comprising a torsion oscillation damper (200) and a torque limiter (9) adapted to exert friction,
the torsional oscillation damper comprising:
- a first rotating element (1) for transmitting the torque rotating around an axis (X) of rotation,
- a second rotating element (2) for transmitting the torque rotating around the axis (X) of rotation,
- a third rotating element (3) for transmitting the torque rotating around the axis (X) of rotation,
- an elastic device (11) comprising a first spring (13) the first spring (13), comprising a first end (131) and an opposite second end (132), and a second spring (14), comprising a first end ( 141) and a second opposite end (142), the first spring (13) being arranged between the first rotating element (1) and the third rotating element (3) so as to be elastically compressed during a relative rotation between the first rotating element (1) and the third rotating element (3) and 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),
in which the second rotating element (2) is coupled in rotation to an output element (5) able to be secured in rotation to a driven shaft,
and in which the torque limiter (9) is integral in rotation with the output element (5). Device (100) according to the preceding claim, in which the first rotating element (1) is 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,
The torsional oscillation damper further comprising:
- a first bearing seat arranged at the first end (131) of the first spring (13), on the one hand between the first rotating element (1) and the first spring (13) to transfer the torque between the first rotating element (1) and the first spring (13) when said first rotating element (1) is rotatable in the direct direction (D) from the rest position, on the other hand between the second rotating element (2) and the first spring (13) for transferring torque between the first spring (13) and the second rotating element (2) when said first rotating element (1) is rotatable in the indirect direction (I) from the rest position, and
- a second bearing seat arranged at the second end (142) of the second spring (14), on the one hand between the first rotating element (1) and the second spring (14) to transfer the torque between the first rotating element (1) and the second spring (14) when said first rotating element (1) is rotatable in the indirect direction (I) from the rest position, on the other hand between the second rotating element (2) and the second spring (14) for transferring torque between the second spring (14) and the second rotating element (2) when said first rotating element (1) is rotatable in the direct direction (D) from the rest position,
And wherein the third rotating element (3) comprises a spacer (51) directly transferring the torque between the first spring (13) and the second spring (14). Device (100) according to the first claim, in which the first rotating element (1) is 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,
the torsional oscillation damper further comprising:
- a first flange (30) comprising a compression lug (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 arranged circumferentially between the second end (142) of the second spring (14) and the first rotating element (1),
wherein the first rotating element (1) moves the first end (131) of the first spring (13) towards the second end (142) of the second spring, via the compression tab of the first flange (30), when said first element rotary (1) is rotatable in the direct direction (D) from the rest position,
and wherein the first rotating member (1) moves the second end (142) of the second spring (14) toward the first end of the first spring, via the second flange compression tab (40), when said first rotating member ( 1) is rotatable in the indirect direction (I) from the rest position. Device (100) according to the preceding claim, in which the second rotating element (2) is a veil (7) or a guide washer (9, 10). Device (100) according to claim 3, in which the second rotating element (2) is the first flange (30) when the first rotating element (1) is rotatable in the indirect direction (I) from the rest position, where is the second flange (40) when the first rotating element (1) is rotatable in the direct direction (D) from the rest position. Device (100) according to any one of the preceding claims, in which the torque limiter (9) comprises a friction device integral in rotation with the second rotating element (2) of the torsional oscillation damper (200). Device (100) according to the preceding claim, in which the torque limiter (9) further comprises a drive plate (94) and/or a cover (93), one of these elements being integral in rotation with the output element (5). Device (100) according to the preceding claim, in which the friction device of the torque limiter (9) comprises a disc (92), formed by the second rotating element (2) of the torsional oscillation damper (200) , and a friction element (91) located axially between the disc and the cover (93) or between the disc and the drive plate (94). Device (100) according to Claim 6, in which the torque limiter (9) further comprises an internal ring (96) integral in rotation with the output element (5), the friction device of the torque limiter (9 ) being adapted to exert radial pressure on the inner ring. Device (100) according to any one of the preceding claims, in which the torque limiter (9) has an axial bulk smaller than the axial bulk of the torsional oscillation damper. Device (100) according to any one of the preceding claims, further comprising a hysteresis system (60) located axially between the torque limiter (9) and the torsional oscillation damper (200). Device (100) according to claim 3 and according to the preceding claim, in which the hysteresis system (60) comprises at least one component suitable for radially and/or axially centering the third rotating element (3), the first flange (30 ) and/or the second flange (40). Hybrid vehicle transmission chain comprising a device (100) according to any one of the preceding claims.