JP7213887B2 - Torsional damping device with main damper and supplementary damper - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to the field of torque transmission in electric power systems, and to torsional dampers for vehicle transmission chains.

Automobiles are commonly equipped with such torsional dampers that can be integrated into various parts of the transmission chain such as dual mass flywheels and clutch discs. Torque limiters may also be associated with torsional dampers for filtering engine acyclism and other torsional vibrations. This filtering is typically performed by one or more torsional damping modules, which operate in torsion and which, during transmission of torque, apply a second torque to the second rotary torque transmitting element. A combined spring damper that allows relative rotation of the one-turn torque transmitting elements. The relative rotation may be enabled by a spring and the damping is a friction device provided with a friction washer axially loaded by a spring washer so as to dissipate part of the energy stored in the spring by friction. can be achieved by

In designing such torsional dampers, special attention is paid to spring selection, sizing, and placement to obtain a characteristic curve suitable for a particular application.

The object of the invention is to improve the prior art torsional damping devices by proposing such devices with modulatable characteristic curves.

In particular, it is an object of the invention to increase the angular stiffness of the damping device beyond a predetermined angular displacement threshold. In particular, it is an object of the invention to increase the angular stiffness of the damping device beyond a predetermined angular displacement threshold.

To this end, the invention relates to a torsional damping device for a vehicle transmission chain, comprising:
- a first rolling element for transmitting torque;
- a second rolling element for transmitting torque;
- at least one damping module comprising a main damper arranged between a first rolling element and a second rolling element, each main damper having a first spring and a second spring arranged in series by means of a phase member; wherein the first spring and the second spring are positioned between the first rotating element and the phase member and between the phase member and the second rotating element, respectively, the first spring and the second spring allows relative rotation about the axis of rotation between the first and second rotating elements as they deform.

Each damping module includes an additional spring supported by a phase member and a torsional damping device for a second rotation from a rest relative angular position assumed by the first and second rotary elements with no submission of velocity or torque. In a first direction of relative rotation of the first rotating element with respect to the element, it is configured as follows:
- if the angular displacement between the first rolling element and the second rolling element is less than a first threshold angular displacement between the first rolling element and the second rolling element, the additional spring is removed from the first rolling element; , at a distance such that no additional torque can be transmitted by the additional spring between the phase member and the first rotating element;
- if the angular displacement between the first rotating element and the second rotating element is greater than or equal to the first angular displacement threshold, the additional spring is such that additional torque is transmitted between the phase member and the first rotating element by the additional spring; directly or indirectly on the first rotating element.

Here, and in the remainder of this document, "direct and indirect" or The expression "directly or indirectly" is used.

The expression "direction of relative rotation" is used to define the relative rotation of the first rotating element with respect to the second rotating element.

The attenuation device may also include one or more of the following features:
- each of the additional springs is a helical spring comprising - a first bearing surface arranged to directly or indirectly support the phase member; a second bearing surface capable of directly or indirectly supporting the first working surface of the first rolling element when the angular displacement between the second rolling element is greater than or equal to the first angular displacement threshold; .

- the torsional damping device is such that from the relative angular position at rest, the angular displacement between the first and second rotary elements in the first direction of relative rotation is the angle between the first and second rotary elements Each of the second springs is arranged to be uncompressed when the displacement is greater than or equal to a second threshold. Deactivation of each of the second springs thus allows increasing the stiffness of the damping device beyond a second predetermined angular displacement threshold.

- according to one embodiment, the angular displacement between the first and the second rotational element is the first and second rotational element in the first direction of relative rotation from the relative angular position at rest; The torsional damping device includes a first stop carried by the phase member and arranged to interact with a second stop carried by the second rotating element for greater than or equal to a second threshold of angular displacement between . Thus, by bringing the first stop into contact with the second stop, the second spring is driven by directly transmitting torque between the first stop of the phase member and the second stop of the second rotating element. compression of the damper, thereby increasing the stiffness of the damper.

- as a variant, each second spring has an angular displacement between the first rolling element and the second rolling element that is greater than or equal to a second threshold angular displacement between the first rolling element and the second rolling element; , so that its rotation is continuously compressed to a maximum.

- from a relative angular position of rest, in a first direction of relative rotation of the first rotary element with respect to the second rotary element, the angular displacement between the first rotary element and the second rotary element is The torsional damping device has an angular position of maximum angular displacement when a third threshold of angular displacement between the two rotating elements is reached. In other words, if the transmitted torque is greater than the torque that produces an angular displacement equal to the third threshold, there is no further damping of the torque.

- A third threshold may be taken by the stop and/or may correspond to the maximum compression of the spring.

Thus, in the damping phase obtained in the first direction of relative rotation, the angular displacement between the first and second rotational elements is greater than zero and less than the first threshold value A1 with respect to the relative angular position at rest. IF; each of the additional springs is unstressed and damping is obtained by:
- the first and second springs of each group of springs and, if desired,
- only the first spring of each group if the first and second stops are already supporting or if the second spring of each group is compressed to its maximum (continuous rotation).

and a first actuation of the first rotary element in a subsequent damping step obtained when the angular displacement between the first rotary element and the second rotary element in the first direction of relative rotation is greater than said first threshold value The surface and the second bearing surface bear against each other such that the additional spring is compressed in parallel with the first spring.

There are actually three possible alternatives:
- either the first threshold and the second threshold are substantially equal and the damping curve has a total of two slopes, the first slope corresponding to the compression of the first and second springs in series and the second A slope corresponds to the compression of each first spring and each additional spring in parallel. Because this second slope simultaneously corresponds to the deactivation of each second spring by the first stop and the second stop and the compression of each additional spring in parallel with each first spring, the second slope corresponds to the second Significantly greater than 1 slope.

-or the first and second thresholds are different and the damping curve has a total of three slopes, the first slope corresponding to the compression of each first and second spring in series and the third slope corresponds to the compression of each first spring and each additional spring in parallel. and the second slope corresponds to either:
- compression of each first spring only if the second threshold is less than the first threshold; or - if the second threshold is greater than the first threshold, by the first and additional springs arranged in parallel Compression of each second spring, each in series with the formed assembly.

A transition slope is thus obtained between a first slope of "relatively low" stiffness and a third slope of "relatively high" stiffness.

- According to one embodiment, the first rotary element forms the torque input element (E) of the torsional damper and the second rotary element forms the torque output element of the torsional damper. Torque from the engine enters the torsional damper through the damper element, which element is called the input element. Torque leaves the gearbox from the torsional damper via the damper element, which element is called the output element.

- Alternatively, the first rotary element forms the torque output element (S) and the second rotary element forms the torque input element of the torsional damper.

- one of the first rolling element and the second rolling element is formed by two guide washers axially retaining the first and second springs of each group of springs; the first rolling element and the second rolling element; The other of the elements is formed by a web axially arranged between two guide washers. According to one embodiment, the second rolling element is formed by two guide washers axially retaining the first and second springs of each group of springs, the first rolling element being formed by two guide washers. formed by axially disposed webs therebetween. As a variant, the first rolling element may be formed by two guide washers axially retaining the first and second springs of each group of springs, the second rolling element being between the two guide washers. may be formed by a web axially arranged in the

- each damping module has at least one pair of transmission plates supported by phase members, each pair of transmission plates comprising a first transmission plate and a second transmission plate axially spaced from each other; The transmission plate has a first thrust zone that directly or indirectly interacts with the first end of the first spring and a second thrust zone that directly or indirectly interacts with the first end of the second spring. and wherein said first thrust zones of each pair of plates are axially separated from each other and said second thrust zones of each pair of plates are axially separated from each other. Thus, torque is transmitted directly or indirectly between the phase member and each group of springs at the side regions of the first end faces of the first and second springs. The thrust zones of the plate are thus arranged axially on either side of the geometric center of the end faces of the first and second springs. Therefore, it is possible to define a thrust polygon at the spacing between the first plate and the second plate to improve the stability of torque transmission by the phase member.

- The term plate here is not limited to flat elements, but elements made in particular of metal, thin enough to be deformed, in particular stamped.

The first and second transmission plates of each pair of transmission plates are respectively formed on first and second phase washers that are axially spaced apart from each other.

The additional spring of the damping module is circumferentially arranged, at least partially, between the first and second springs of this damping module.

The first spring has a first central axis, the second spring has a second central axis, and the intersection of the first central axis and the second central axis is located in the space occupied by the additional spring.

There is a plane perpendicular to the axis of rotation that passes through the first spring, the second spring and the additional spring.

The phase member comprises at least one radially extending annular portion disposed radially inwardly of the first and second springs.

Each phase washer includes a radially extending annular portion disposed radially inwardly of the first and second springs.

By locating this annular portion radially inward (rather than outwardly) of the first and second springs, the deformation of this annular portion is less. Furthermore, the inertia is lower, which makes it possible to avoid low frequency resonance frequencies that would be detrimental.

The first spring and the second spring are arranged on substantially the same radius about the axis of rotation. In other words, they are arranged in series on the same circular path.

The stiffness of the first spring is between 50% and 150% of the stiffness of the second spring.

The first spring occupies 50% to 150% of the volume occupied by the second spring.

- The two phase washers are axially spaced from each other and fixed to each other. In particular, two phase washers are secured together by spacers, each spacer having a first end crimped to one of the phase washers and a second end crimped to the other of the phase washers.

- Two phase washers are placed on each side of the web.

- The second rolling element has two guide washers axially arranged on either side of the phase member.

- each damping module comprises a transmission head supported by a phase member, the transmission head being circumferentially arranged between a first spring and a second spring of a group of springs of the damping module, each transmission head comprising: , a housing containing an additional spring of the damping module therein, whereby the angular displacement between the first and second rotary elements is equal to or greater than a first threshold angular displacement in the first direction of relative rotation; to transmit additional torque between the phase member and the first rotating element.

- for each damping module, the transmission head is formed by a pair of transmission plates, the first transmission plate and the second transmission plate each comprising an opening, the opening of the first transmission plate and the opening of the second transmission plate comprising: They are arranged axially opposite each other so as to accommodate the additional springs of the corresponding damping modules.

- Each transmission head further comprises two axial retaining elements for axially retaining the associated additional springs, the two axial retaining elements for the additional springs axially on either side of the additional springs. placed in

- each axial retaining element for retaining an additional spring is formed by a retaining tab bent in a direction with a radial component, the retaining tab being one of the first and second transmission plates of said transmission head; is formed in one of the

- Each transmission head thus comprises two axial retaining elements axially arranged on either side of the additional spring associated with the transmission head. The phase member therefore also ensures the axial guidance of each additional spring.

- each axial retaining tab protrudes with the radial component from the edge of the opening of the first or second transmission plate containing said retaining tab; In particular, the retention tab projects from the lower radial edge of the opening. In other words, the contour of the retention tab defines a portion of the contour of the opening prior to bending of the retention tab.

- each transmission plate is associated with said transmission plate against centrifugal force with a first radial retaining element arranged to radially retain a first spring associated with said transmission plate against centrifugal force; a second radial retention element arranged to radially retain the second spring.

- the first and second radial retention elements of each transmission plate are arranged circumferentially on either side of the associated additional spring in the circumferential extension of the associated additional spring;

- the first radial retaining element is a first circumferentially extending finger radially outside the first spring;

- the second radial retaining element is a second circumferentially extending finger radially outside the second spring;

- in each plate the first finger extends circumferentially protruding from the outer radial end of the first thrust zone;

- On each plate, from the outer radial edge of the second thrust zone, a second finger protrudes and extends circumferentially.

- If necessary, each additional spring is prestressed against its housing.

- each additional spring is circumferentially arranged between the first and second springs of the associated damping module;

- the volumes of the first and second springs of each damping module are provided inside in a torus, at least part of the associated additional springs being also arranged in this torus; It is thus possible to provide a radially compact damping device.

- the first and second springs of the damping module extend along respective first and second axes, the first and second axes being substantially perpendicular to the axis of rotation X; An additional spring associated with the damping module provided medially in the implant plane extends substantially along a third axis provided medially in the implant plane. It is thus possible to provide an axially compact damping device.

- each additional spring has, in a plane perpendicular to axis X, a first inner corner facing the first spring of the module associated with said additional spring and a second corner facing the second spring of the module associated with said additional spring; a first inner corner and a second inner corner in the plane of the face of the first end of the first spring and the first end of the second spring interacting with the phase member; is arranged in the circumferential direction between the faces of the

- Each phase washer has an annular portion and each plate is connected to the annular portion of the phase washer by a radial arm.

- the first thrust zone of each plate is formed by the first wall of said plate and the second thrust zone of each plate is formed by the second wall of said plate;

- the slope of the first wall and the slope of the second wall of the same plate are planes perpendicular to the axis X through the first and second walls, the line of intersection of the first wall with said plane being the associated additional spring; and the axis of rotation X intersect the line of intersection with the plane of the second wall.

- For example, the angular stiffness of the additional spring represents at least twice the angular stiffness of the stiffer of the first and second springs. For example, the angular stiffness of the first spring may be 10 Nm/° ±50%, the angular stiffness of DR2 may be 15 Nm/° ±50%, and the angular stiffness of the additional springs may be 30 Nm/° ±50%. may be

- The first rolling element comprises, for each group of springs, a main opening capable of accommodating a first spring and a second spring.

- the first rolling element comprises, for each damping module, a cavity capable of allowing circumferential movement of the additional spring relative to the first rolling element, the first actuation surface 40 being located at the circumferential end of this cavity; form one.

- The main openings and cavities associated with the same damping module are formed in the same window of the first rotary element.

- the first rolling element comprises a first bearing surface arranged to interact with a second end of the first spring opposite the first end of the first spring and the first end of the second spring; and a second bearing surface positioned to interact with the second end of the opposite second spring.

- the guide washers of the second rolling element are formed in a metal sheet, each arranged to partially accommodate and axially guide the first and second springs of the spring group for each group of springs; with stamped parts.

- each guide washer, for each group of springs, is arranged to interact with a third bearing surface arranged to interact with the second end of the first spring and the second end of the second spring; and a fourth bearing surface.

- the first stop is at the outer circumference of the phase member;

- the first transmission plate and/or the second transmission plate of the phase member has a lug forming a first stop b1; The lug extends axially over the radially outer edge of the second rotating element.

- Lugs are provided radially above the additional springs.

- A lip curved towards the lug connects the lug to the radially outer edge of the opening in each plate. This lip reinforces the plate radially outside the opening.

- the second stop is on the outer circumference of the second rolling element;

- the second stop is formed by a first tooth extending radially outward from at least one of the guide washers;

- Each transmission head has a first stop.

- the torsional damping device is a third stop supported by the first rotary element for a first rotation in a first direction of relative rotation of the first rotary element with respect to the second rotary element from a relative angular position of rest; a fourth stop supported by the second rolling element when the angular displacement between the first rolling element and the second rolling element reaches a third threshold angular displacement between the element and the second rolling element; a third stop positioned to interact with the

- the third stop is on the outer circumference of the first rolling element;

- the third stop is formed by a hook formed on the outer radial periphery of the web, the hook having a substantially axially extending end zone, which end zone of one of the guide washers 9a, 9b; It can move circumferentially radially outward of one outer radial edge.

- the third stop is circumferentially arranged between the two main openings in the first rolling element;

- the fourth stop is on the outer circumference of the second rolling element;

- the fourth stop is formed by a second tooth extending radially outwardly from at least one of the guide washers;

- The attenuation device has two attenuation modules.

- the torsional damping device is arranged in a direction opposite to the first direction of relative rotation from the relative angular position of rest assumed by the first and second rotary elements with no speed or torque exerted, relative to the second rotary element; In the second direction of relative rotation of one rotating element, it is configured as follows:
- each additional spring from the first rolling element if the angular displacement between the first rolling element and the second rolling element is less than a fourth threshold of angular displacement between the first rolling element and the second rolling element; I keep my distance,
- each additional spring directly or indirectly supports the first rolling element when the angular displacement between the first rolling element and the second rolling element is greater than or equal to a fourth angular displacement threshold, thereby producing an additional torque; , can be transmitted by respective additional springs between the phase member and the first rotating element.

- in contrast, if the angular displacement between the first rolling element and the second rolling element is less than the fourth angular displacement threshold, the additional spring transmits additional torque between the phase member and the first rolling element; do not do.

- in the second direction of relative rotation, the first bearing surface is the second working surface of the first rolling element if the angular displacement between the first rolling element and the second rolling element is greater than or equal to a fourth angular displacement threshold; and the second bearing surface of each additional spring is arranged to directly or indirectly support the phase member.

- the second bearing surface of each additional spring is directly or indirectly against a second peripheral edge opposite the first peripheral edge of the opening in the second transmission plate and the first transmission plate associated with said additional spring; positioned to support the

- the torsional damping device is such that from the relative angular position at rest, the angular displacement between the first and second rotary elements in the second direction of relative rotation is the angle between the first and second rotary elements The second spring is arranged to become uncompressed when the displacement is greater than or equal to a fifth threshold. The deactivation of the second spring therefore makes it possible to increase the stiffness of the damping device beyond a fifth predetermined angular displacement threshold in this second direction of relative rotation.

- when the angular displacement between the first and second rotational elements in the second direction of relative rotation reaches a fifth displacement threshold, the fifth stop is supported by the phase member and by the second rotational element; Arranged to interact with a supported sixth stop. Thus, by bringing the fifth stop into contact with the sixth stop, the second spring is driven by directly transmitting torque between the fifth stop of the phase member and the sixth stop of the second rotating element. to stop the compression of the damper, thereby increasing the stiffness of the damper.

- A fifth stop is also formed on the lug forming the first stop.

- the first stop and the fifth stop are formed at two circumferentially opposite edges of the lug;

- A sixth stop is formed on the second tooth which also forms a fourth stop.

- the fourth and sixth stops are formed on two circumferentially opposite edges of the second tooth;

- the torsional damping device is such that from a relative angular position of rest, the angular displacement between the first and second rotary elements in a second direction of relative rotation of the first rotary element with respect to the second rotary element is and the second rotational element has an angular position of maximum angular displacement when a sixth threshold of angular displacement is reached. In other words, there is no further damping of torque for torques greater than the torque that produces an angular displacement equal to the sixth threshold.

- A sixth threshold may be obtained by a stop and/or may correspond to the maximum compression of the spring.

- the additional springs are on the one hand fitted to the first peripheral edges of the openings of the first and second transmission plates or fixed by being clamped between them and on the other hand their second peripheral edges; or fixed by clamping between them. Each additional spring may be prestressed in its housing.

- a torsional damping device according to the preceding claim, in which from a relative angular position of rest, between a first rotary element and a second rotary element in a second direction of relative rotation of the first rotary element with respect to the second rotary element; is arranged to interact with an eighth stop carried by the second rolling element and the first The damping device has a seventh stop supported by the rolling element.

- A seventh stop is formed on the hook which also forms a third stop.

- The seventh stop and the third stop are formed on two circumferentially opposite edges of the hook.

- The eighth stop is formed on the first tooth which also forms the second stop.

- the second bearing surface of each additional spring is arranged to directly or indirectly bear against the second peripheral edge of the opening of the second transmission plate and the first transmission plate associated with said additional spring; .

- the first bearing seat is interposed on the one hand between the first rolling element and the first spring of each damping module and on the other hand between the first spring and the second rolling element of each damping module; .

- the second bearing seat is interposed on the one hand between the second spring and the first rolling element of each damping module and on the other hand between the second spring and the second rolling element of each damping module; .

- the first bearing surface has a first notch arranged to accommodate a pivot protruding from the first seat;

- the second bearing surface has a second notch arranged to accommodate the pivot projecting from the second seat;

- the third bearing surface has a third notch arranged to accommodate the pivot projecting from the first seat;

- the fourth bearing surface has a fourth notch arranged to accommodate the pivot projecting from the second seat;

- A third bearing seat is interposed between the first spring of each damping module and the phase member.

- A fourth bearing seat is interposed between the second spring of each damping module and the phase member.

- the third seat has a front bearing surface that interacts with the first end of the first spring;

- the fourth seat has a front bearing surface that interacts with the first end of the second spring;

- according to one embodiment, the angular displacement between the first and second rotary element in the first direction of relative rotation from the relative angular position of rest is between the first and second rotary element; The second bearing seat and the fourth bearing seat are arranged to contact each other when the angular displacement is greater than or equal to a second threshold. In other words, the first stop is formed on the fourth bearing seat and the second stop is formed on the second bearing seat.

- Each bearing seat has a cover arranged to radially retain the spring it supports against centrifugal forces.

- A first stop is formed at the end of the cover of the fourth bearing seat and a second stop is formed at the end of the cover of the second bearing seat.

- According to one embodiment, the two axial holding elements of each transmission head are formed by eyecups; the first transmission plate and the second transmission plate associated with the corresponding transmission module each comprise an eyecup.

- Two cuts are made in each plate, circumferentially on either side of the portion of the plate intended to form the eyecup.

- Optionally, at least one of the peripheral edges of the eyecup forms the first stop of the damping device. Thus, the angular displacement between the first rotating element and the second rotating element in the first direction of relative rotation of the first rotating element with respect to the second rotating element from the relative angular position of rest is The eyecup is arranged to bear against the teeth of the second rotating element forming a second stop when the angular displacement with the rotating element is greater than or equal to a second threshold.

- The other peripheral edge of the eyecup forms the fifth stop of the damping device.

- the phase member comprises means for axially guiding the first spring and the second spring;

- for example, each transmission plate comprises a first centering member arranged inside the first end of the first spring and a second centering member arranged inside the first end of the second spring;

- This allows axial guidance of the first and second springs.

- Each centering member is a C-shaped curved tongue formed in the sheet metal of the plate.

- the tongues forming the first centering member of the first transmission plate and the tongues forming the first centering member of the second transmission plate are arranged axially opposite each other for centering the first spring; Form a centering tube.

- the tongues forming the second centering member of the first transmission plate and the tongues forming the second centering member of the second transmission plate are arranged axially opposite each other for centering the second spring; Form a centering tube.

- one of the first rolling element and the second rolling element is rotatably connected to the friction disc and the other of the first rolling element and the second rolling element is rotatably connected to a hub capable of rotating the gearbox input shaft; .

- A first rolling element is rotatably connected to the friction disc and a second rolling element is rotatably connected to a hub capable of rotating the gearbox input shaft.

- The damping device also includes a friction device F intended to dissipate the energy of the spring and avoid vibration phenomena. Preferably, the friction device is arranged to rub only in the reverse transmission direction.

- the invention also relates to a transmission system comprising a torque limiter comprising a friction disc and a damping device according to one of the preceding claims, wherein the friction disc is one of the first rolling element and the second rolling element of the damping device; It rotates and attaches in one piece.

- The additional spring is arranged radially inside the friction disc.

According to another solution:
- The third bearing seat is pivotally mounted on the phase member.

- The fourth bearing seat is pivotally mounted on the phase member.

- The third and fourth seats are pivotally mounted about the same pivot pin. The inclination of the third and fourth seats can thus vary depending on the torque transmitted by the damping device and depending on the centrifugal force. Pivoting of the seat thus makes it possible to limit the friction in the first and second springs.

- the third bearing seat and/or the fourth bearing seat 180 are pivotally mounted around a spacer for connecting the two phase washers, the spacer 116 forming a pivot pin for the seat;
- the third and fourth sheets each have axially overlapping perforated connecting tabs so that their holes also overlap, and the pivot pins are located in the holes in the connecting tabs of the third sheet and in the fourth sheet; are inserted into both of the holes in the connecting tabs of the

- The third seat has a back bearing surface that interacts with an additional spring. This bearing surface is formed in a notch in the third seat.

- the third seat is circumferentially interposed between the first spring and the additional spring;

- The fourth seat has a back bearing surface that interacts with an additional spring. This bearing surface is formed in a notch in the fourth seat.

- the fourth seat is circumferentially interposed between the second spring and the additional spring;

- The additional spring is clamped and fixed between the third seat via its first bearing surface and the fourth seat via its second bearing surface. Thus, when the additional spring is compressed, the spring's bearing points in the seat move angularly closer together. It is thus possible to obtain a further increase in stiffness.

- The third seat has a first peg located in a recess in the first transmission plate, the edge of the recess being able to limit the movement of the first peg, thereby limiting the pivoting of the third seat.

- The third seat has a second peg located in a recess in the second transmission plate, the end of the recess being able to limit the movement of the second peg, thereby limiting the pivoting of the third seat.

- the fourth seat has a first peg located in a recess in the first transmission plate, the end of the recess being able to limit the movement of the first peg and thus restricting the pivoting of the fourth seat; .

- the third seat has a second peg located in a recess in the second transmission plate, the end of the recess being able to limit the movement of the second peg, thereby limiting the pivoting of the fourth seat;

Preferred embodiments of the invention will now be described with reference to the accompanying drawings, in which:
1 and 2 are block diagrams illustrating the principle of operation of the invention. 1 and 2 are block diagrams illustrating the principle of operation of the invention. FIG. 3 is an exploded view of the first embodiment. FIG. 4 is a perspective view of the first embodiment. Figure 5 is a perspective view of the first embodiment without the guide washer of the second rolling element shown; 6 and 7 are cross-sectional views of the first embodiment. 6 and 7 are cross-sectional views of the first embodiment. FIG. 8 is a graph showing three characteristic attenuation curves corresponding to three variants of the first embodiment; 9 and 10 are detailed perspective views of a second embodiment having two distinct stages of angular displacement. 9 and 10 are detailed perspective views of a second embodiment having two distinct stages of angular displacement. 11 and 12 are perspective views illustrating another solution phase member. 11 and 12 are perspective views illustrating another solution phase member. 13 is a perspective view of a phase member according to a third embodiment; FIG. FIG. 14 is a perspective view of a damping device according to a third embodiment;

Figures 1 and 2 show two block diagrams showing a torsional damping device for a vehicle transmission chain, said torsional damping device comprising:
- a first rolling element 7 for transmitting torque;
- a second rolling element 9 for transmitting torque;
- a damping module comprising main dampers A arranged between a first rolling element 7 and a second rolling element 9, each main damper A comprising a first spring 13-1 and a second spring 13-2; including a group of springs, a first spring 13-1 and a second spring 13-2 arranged in series by the phase member 15, the first spring 13-1 and the second spring 13-2 respectively connecting the first rotating element 7 and the The first spring 13-1 and the second spring 13-2 are arranged between the phase member 15 and between the phase member 15 and the second rotation element 9, and the first spring 13-1 and the second spring 13-2 are arranged between the first rotation element 7 and the second rotation element 9 when they are deformed. A damping module that allows relative rotation about the axis of rotation X between the two rotating elements 9 .

The damping module includes an additional spring 25 supported by the phase member 15 and the torsional damping device is adapted to reduce the torsional damping from the static relative angular position taken by the first rotating element 7 and the second rotating element 9 without any velocity or torque submission to the second In a first direction of relative rotation of the first rotating element 7 with respect to the second rotating element 9, it is arranged as follows:
- the phase member 15 if the angular displacement between the first rolling element 7 and the second rolling element 9 is less than a first threshold A1 for the angular displacement between the first rolling element 7 and the second rolling element 9; the additional spring 25 is spaced from the first rolling element 7 so that no additional torque is transmitted by the additional spring 25 between and the first rolling element,
- an additional torque by the additional spring 25 between the phase member 15 and the first rolling element 7 if the angular displacement between the first rolling element 7 and the second rolling element 9 is greater than or equal to the first angular displacement threshold A1; The additional spring bears directly or indirectly against the first rotating element 7 so that the is transmitted.

From the relative angular position of rest, the angular displacement between the first rotating element 7 and the second rotating element 9 in the first direction of relative rotation of the first rotating element 7 with respect to the second rotating element 9 is The torsional damping device is arranged such that each second spring 13-2 is not compressed when the angular displacement between it and the second rotating element 9 is greater than or equal to a second threshold value A2.

For this purpose, the torsion damping device shown diagrammatically comprises a first stop b1, which is supported by the phase member 15 and, from a relative angular position of rest, a first relative rotation. A second rotation if the angular displacement between the first rotating element 7 and the second rotating element 9 in the direction is greater than or equal to a second threshold value A2 of the angular displacement between the first rotating element 7 and the second rotating element 9 It is arranged to interact with a second stop b2 carried by the element 9 .

The torsional damping device is also such that from the relative angular position of rest, the angular displacement between the first rotary element 7 and the second rotary element 9 in the first direction of relative rotation is has an angular position of maximum angular displacement when a third threshold A3 of angular displacement between is reached. In other words, if the transmitted torque is greater than the torque that produces an angular displacement equal to the third threshold A3, there is no further damping of the torque.

For this purpose, the diagrammatically shown torsional damping device comprises a third stop b3, which is supported by the first rotary element 7 and which, from a relative angular position of rest, can be moved to a position of relative rotation. If the angular displacement between the first rotary element 7 and the second rotary element 9 in the first direction reaches a third threshold A3 of the angular displacement between the first rotary element 7 and the second rotary element 9, the It is arranged to interact with a fourth stop b4 carried by the two-rotating element 9 .

In FIG. 1 the torque input element of the damping device is the first rotary element 7 and the torque output element of the damping device is the second rotary element 9 .

In FIG. 2 the torque input element of the damping device is the second rotary element 9 and the torque output element of the damping device is the first rotary element 7 .

1 and 2, if the angular displacement between the first rotating element 7 and the phase member 15 reaches the threshold A1', the first angular displacement threshold A1 is reached and the phase member 15 and the second rotating A second angular displacement threshold A2 is reached when the angular displacement between the elements reaches a threshold A2'.

In the description and claims, the terms "outer" and "inner" are used with "axial" and "radial" orientations to denote elements of the damping device according to the definitions given in the description. be. The axis of rotation X determines the "axial" orientation. A "radial" orientation is oriented perpendicular to the X axis. A "circumferential" orientation is oriented perpendicular to the axis of rotation X and perpendicular to the radial direction. The terms "outer" and "inner" are used to define the relative position of one component with respect to another with respect to the axis of rotation X, and are thus as opposed to outer elements located radially at the periphery. , the components close to the axis are described as internal. Furthermore, the angles and angular sectors to be represented are defined relative to the axis X of rotation.

FIGS. 3-7 show a first embodiment of a torsional damping device as shown schematically in FIG.

This torsional damping device is coupled to the friction disc 2 of a torque limiter intended to transmit the torque by rotating about the axis X in normal operation and to limit this torque to a certain value. . The friction disc 2 has a support disc to which two friction linings 3 are attached on either side by a first set of rivets 4 .

The friction disc 2 is fixed by means of a second set of rivets 6 to a first rotary torque transmission element, which in this case is constituted by a disc referred to as the "web" 7.

In a transmission system, as shown in FIGS. 6 and 7, the friction disc 2 connected to the damping device forms part of the torque limiter, the lining 3 of the friction disc being rigidly attached to the flywheel. A spring-loaded pressure disc 86 , such as a Belleville washer 87 , presses against the mounted bearing disc 88 .

The hub 5 is fixed by a third set of rivets 8 to a second rotary torque transmitting element, which in this case is constituted by a pair of discs referred to as "guide washers" 9a, 9b. . A first guide washer 9 a is fixed against one side of the hub 5 and a second guide washer 9 b is fixed against the opposite side of the hub 5 . Two guide washers 9a and 9b axially retain the first and second springs of each group of springs, the web 7 being axially arranged between the two guide washers 9a and 9b.

The hub 5 has internal splines that can interact with the external splines of the transmission shaft.

The two torsional damping modules M1 and M2 interposed between the web 7 and the guide washers 9a, 9b are arranged to compress the web 7 on the one hand and the guide washers 9, 10 on the other hand by compressing the two damping modules M1 and M2. so that they can rotate relative to each other.

In operation the flywheel rotates the friction disc 2 and thus the web 7 which is rigidly fixed thereto. The web 7 compresses the damping module, which transmits the torque to the guide washers 9a, 9b and thus to the hub 5 which is rigidly fixed to them. By transmitting torque between the web 7 and the guide washers 9a, 9b, the damping module eliminates acyclism and other undesirable torsional movements.

In each damping module the additional spring 25 is a helical spring comprising:
- a first bearing surface 25a arranged for direct or indirect support against the phase member 25, and - an angular displacement between the web 7 and the guide washers 9a, 9b in a first direction of relative rotation. is greater than or equal to a first angular displacement threshold A1, the second bearing surface 25b can directly or indirectly support the first working surface 40 of the web 7;

Each damping module has a pair of transmission plates 17a and 17b supported by phase members 15, each pair of transmission plates comprising a first transmission plate 17a and a second transmission plate 17b axially spaced from each other. .

Each transmission plate has a first thrust zone P1 that directly or indirectly interacts with the first end 13-11 of the first spring 13-1 and the first end 13-21 of the second spring 13-2. and a second thrust zone P2 for each pair of plates, said first thrust zones for each pair of plates being axially spaced apart from each other, and said second thrust zone for each pair of plates. are axially spaced from each other. Accordingly, torque is transmitted directly or indirectly between the phase member and each group of springs at the side regions of the faces of the first ends of the first and second springs 13-1 and 13-2. be. The thrust zones of the plate are thus axially located on either side of the geometric center of the faces of the first ends of the first and second springs 13-1 and 13-2. Varying the thrust polygon of the spring as a function of the spacing between the first and second plates can therefore be particularly magnified, thus increasing the transmission of torque by the phase member. It is possible to improve stability.

A first transmission plate 17a and a second transmission plate 17b of each pair of transmission plates are formed on a first phase washer 15a and a second phase washer 15b, respectively, axially spaced from one another. The two phase washers 15a and 15b are secured together by spacers 16, each spacer 16 having a first end that is crimped against one phase washer and a second end that is crimped against the other phase washer. have

Two phase washers 15a and 15b are arranged on either side of the web 7 and two guide washers 9a and 9b are arranged axially on either side of the two phase washers 15a and 15b.

Each damping module M1, M2 comprises a transmission head 17 interposed directly or indirectly between a first spring 13-1 and a second spring 13-2 of the spring group of the damping module. Each transmission head 17 comprises a housing L inside which an additional spring 25 of the damping module is accommodated.

each pair of transmission plates 17a, 17b forming the transmission head 17 of the phase member 15, the first transmission plate 17a and the second transmission plate 17b of each pair of transmission plates comprising openings 47a, 47b, respectively; The opening 47a of the first transmission plate 17a and the opening 47b of the second transmission plate 17b are arranged axially opposite each other so as to accommodate the additional springs 25 of the corresponding damping modules M1, M2.

The first bearing surface 25a of each additional spring 25 is directly or indirectly against the first peripheral edge 47a1 of the opening 47 of the first transmission plate 17a and the first peripheral edge 47b1 of the opening 47b of the second transmission plate 17b. placed so as to support it.

Each transmission head 17 further comprises two axial retaining elements 18 a , 18 b axially arranged on either side of the additional spring 25 associated with the transmission head for axially retaining the additional spring 25 .

Each axial retaining element 18a, 18b for retaining an additional spring is formed by a retaining tab 18a, 18b bent in a direction with a radial component, the retaining tab 18a, 18b being the first transmission of said transmission head. It is formed in one of the plate 17a and the second transmission plate 17b. The phase member 15 thus also ensures the axial guidance of each additional spring 25 .

Each axial retention tab 18a, 18b projects with a radial component from the lower radial edge of the opening 47a, 47b of the first transmission plate 17a or the second transmission plate 17b carrying said retention tab 18a, 18b. In other words, the contours of retention tabs 18a, 18b define portions of the contours of openings 47a, 47b prior to bending of retention tabs 18a, 18b.

Each transmission plate 17a, 17b is associated against centrifugal force with a first radial retaining element 19a, 19b arranged to radially retain the associated first spring 13-1 against centrifugal force. second radial retaining elements 20a, 20b arranged to radially retain the second spring 13-2.

In particular, the first radial retaining element 19a, 19b and the second radial retaining element 20a, 20b of each transmission plate are arranged on either side of the circumferentially associated additional spring 25 and in the circumferential extension of the associated additional spring 25. placed.

Each first radial retaining element 19a, 19b is formed by a first circumferentially extending finger radially outwardly of the first spring 13-1. Each second radial retaining element 20a, 20b is formed by a second circumferentially extending finger radially outwardly of the second spring 13-2.

On each plate 17a, 17b, a first finger 19a, 19b protrudes and extends circumferentially from the outer radial end of the first thrust zone P1. On each plate, the second fingers 20a, 20b extend circumferentially from the outer radial end of the second thrust zone P2 projecting in a direction opposite to the first fingers.

According to one embodiment, each additional spring 25 is circumferentially arranged between the second and first springs of the associated damping module. The volumes of the first and second springs 13-1 and 13-2 of each damping module M1, M2 are located inside at a torus, on which at least part of the associated additional springs 25 are also arranged. . It is thus possible to provide a radially compact damping device.

The first and second springs 13-1 and 13-2 of the damping module M1 extend along first and second axes respectively, the first and second axes substantially rotating. Arranged inwardly in a plane of implantation perpendicular to the axis X, the additional spring 25 of the damping module M1 extends along a third axis, said third axis also being arranged substantially inwardly in this plane of implantation. there is It is thus possible to provide an axially compact damping device. The axis of the spring of the second damping module M2 is provided inside substantially the same implant plane.

Each additional spring 25 faces, in a plane perpendicular to axis X, a first inner corner 253 facing the first spring of the module associated with said additional spring and the second spring of the damping module associated with said additional spring. 252, the first and second inner corners being in this plane the first end 13-11 of the first spring 13-1 and the second spring 13-1 interacting with the phase member 15. Circumferentially disposed between the first ends 13-21 of 13-2.

As seen in Figures 3 and 5, each phase washer 15a, 15b has an annular portion and each plate 17a, 17b is connected to the annular portion of the phase washer 15a, 15b by a radial arm.

The first thrust zone of each plate is formed by the first wall P1 of said plate and the second thrust zone of each plate is formed by the second wall P2 of said plate. These walls correspond to edge portions of the first transmission plate 17a and the second transmission plate 17b. The inclination of the first wall P1 and the inclination of the second wall P2 of the same plate is between the associated additional spring 25 and the axis of rotation X in a plane perpendicular to the axis X passing through the first wall P1 and the second wall P2. A line that intersects the plane of the first wall P1 intersects a line that intersects the plane of the second wall P2.

The web 7 comprises for each group of springs a main opening 71 which can accommodate both the first spring 13-1 and the second spring 13-2. Furthermore, the web 7 comprises cavities 72 that can allow circumferential movement of the additional springs 25 relative to the web 7 for each damping module M1, M2. The first working surface 40 forms one of the circumferential ends of this cavity 72 . In this case, the main openings 71 and cavities 72 associated with the same damping modules M1, M2 are formed in the same window of the web 7. FIG.

The web 7 has a first bearing surface 74 arranged to interact with the second end 13-12 of the first spring 13-1 opposite the first end 13-11 of the first spring 13-1. and a second bearing surface 73 positioned to interact with the second end 13-22 of the second spring 13-2 opposite the first end 13-21 of the second spring 13-2. have.

The guide washers 9a, 9b are formed of sheet metal and respectively for each group of springs so as to partially accommodate and axially guide the first spring 13-1 and the second spring 13-2 of the group of springs. It has stamped portions 91a, 91b located at the .

Each guide washer 9a, 9b has, for each group of springs, a third bearing surface 94 arranged to interact with the second end 13-12 of the first spring 13-1 and a second spring 13-2. and a fourth bearing surface 93 arranged to interact with the second end 13-22 of the.

Each guide washer 9a, 9b has, per group of springs:
- a first slot located between the stamped portion and the third bearing surface 94 and allowing a portion of the second end 13-12 of the first spring 13-1 to pass therethrough; 4 a second slot located between the bearing surface 93 and allowing a portion of the second end 13-22 of the second spring 13-2 to pass through.

As seen in FIG. 5, the first spring 13-1 and the second spring 13-2 are arranged on substantially the same radius around the axis of rotation. In other words, they are arranged in series on the same circular path.

An additional spring 25 of the damping module is circumferentially arranged, at least partially, between the first spring 13-1 and the second spring 13-2 of this damping module. The first spring 13-1 has a first central axis, the second spring 13-2 has a second central axis, and the intersection of the first central axis and the second central axis is the space occupied by the additional spring 25. Located in

Furthermore, there is a plane perpendicular to the axis of rotation that passes through the first spring 13-1, the second spring 13-2 and the additional spring 25. FIG.

It can also be seen that the phase member includes two radially extending annular portions disposed radially inwardly of the first spring 13-1 and the second spring 13-2. Each phase washer includes a radially extending annular portion disposed radially inwardly of the first spring 13-1 and the second spring 13-2.

In this first embodiment, the first angular displacement threshold A1 is approximately 40 degrees and substantially equal to the second angular displacement threshold A2. The angular stiffness of the additional spring 25 of each damping module is greater than the angular stiffness of the first spring 13-1 and greater than the angular stiffness of the second spring 13-2. In this case the stiffness of each first spring 13-1 is about 10 Nm/°, the stiffness of each second spring 13-2 is about 15 Nm/° and the stiffness of each additional spring is about 30 Nm/°. .

An example of a decay curve is shown in FIG. These graphs show the variant embodiment before the displacement reaches the third angular displacement threshold. In these variants there is no stop between the first and second rolling elements. Graph 1 shows a variant in which the first threshold A1 is equal to the second threshold A2. Graphs 2 and 3 show the attenuation for the other two deformations.

Graph 2: the second threshold A2 is greater than the first threshold A1 Graph 3: the second threshold A2 is less than the first threshold A1 You can see that you can get a slope.

In a first embodiment shown in FIGS. 3-7, a first stop b1 is made on each transmission head on the outer circumference of the phase member 15. In the first embodiment shown in FIGS. The first transmission plate 17a and the second transmission plate 17b of the phase member 15 each have a lug 41 forming a first stop b1. The lugs 41 extend axially so that each radially covers the radially outer edge of the guide washers 9a, 9b. Each lug 41 is radially mounted above the additional spring 25 .

On each transmission plate 17a, 17b a lip 159 curved towards the lug 41 connects the lug 41 to the radially outer edge of the opening 47a, 47b of the transmission plate 17a, 17b. This lip 159 stiffens the plate radially outside the opening.

A second stop b2 is made on the outer periphery of the two guide washers 9a, 9b. The second stop b2 is formed by a first tooth 42 extending radially outward from the guide washers 9a, 9b.

The torsional damping device is also a third stop b3 supported by the web 7, the angular displacement between the web 7 and the second guide washer 9b in the first direction of relative rotation from a static relative rotational angular position of It comprises a third stop b3 arranged to interact with a fourth stop b4 carried by the second guide washer 9b when a third threshold A3 of angular displacement is reached. A third stop b3 is made on the outer circumference of the web 7 . The third stop b3 is formed by two hooks 43 each having a substantially axially extending end zone, which extends to the outer radius of the second guide washer 9b. It can move circumferentially, radially outward of the direction edge.

A third stop b3 is made circumferentially between the two main openings 71 of the web 7 .

A fourth stop b4 is made on the outer circumference of the second guide washer 9b. The fourth stop b4 is formed by two second teeth 44 extending radially outward from the second guide washer 9b.

The above operating principle works equally well in the so-called direct direction of transmission, i.e. for the torque path leading from the engine to the vehicle gearbox or from the torque input element to the torque output element of the damping device, It works equally well in the transmission direction called reverse, ie for the torque path leading from the gearbox to the vehicle engine or from the torque output element to the torque input element of the damping device.

Thus, from a static relative angular position in which no velocity or torque is submitted by the web 7 and the second rotating element 9, the first direction of relative rotation of the web 7 with respect to the guide washers 9a, 9b is opposite to the first direction of relative rotation. Each additional spring 25 is forced into the web 7 if, in two directions, the angular displacement between the web 7 and the guide washers 9a, 9b is less than a fourth threshold A4 for the angular displacement between the web 7 and the guide washers 9a, 9b. The torsional damping device is constructed such that it is spaced a distance from . Therefore, the additional spring 25 does not transmit torque between the phase member 15 and the web 7 if the angular displacement between the web 7 and the guide washers 9a, 9b is less than the fourth angular displacement threshold A4.

Additional torque can be transmitted by each additional spring 25 between the phase member 15 and the web 7 if the angular displacement between the web 7 and the guide washers 9a, 9b is greater than or equal to a fourth angular displacement threshold A4. As such, each additional spring 25 supports the web 7 directly or indirectly.

The torsional damping device is such that from the relative angular position at rest, the angular displacement between the web 7 and the second rotating element 9 in the second direction of relative rotation is the first of the angular displacements between the web 7 and the guide washers 9a, 9b. The second spring 13-2 is arranged so that it is not compressed when it is equal to or greater than the 5th threshold value A5. Deactivation of the second spring 13-2 thus makes it possible to increase the stiffness of the damping device beyond a fifth predetermined threshold value A5 of angular displacement in this second direction of relative rotation.

A fifth stop b5 carried by the phase member 15 interacts with a sixth stop b6 carried by the guide washers 9a, 9b when the angular displacement in the second direction of relative rotation reaches a fifth displacement threshold A5. are arranged as follows.

A fifth stop b5 is also formed on the lug 41 forming the first stop b1. A first stop b1 and a fifth stop b5 are formed at two circumferentially opposite edges of the lug 41 .

A sixth stop b6 is formed on a second tooth 44 which also forms a fourth stop b4. A fourth stop b4 and a sixth stop b6 are formed at two circumferentially opposite edges of the second tooth 44 .

Thus, bringing the fifth stop b5 into contact with the sixth stop b6 directly transfers torque between the fifth stop b5 of the phase member 15 and the sixth stop b6 of the guide washers 9a, 9b. and thereby increase the stiffness of the damping device, making it possible to stop the compression of the second spring 13-2.

From the relative angular position of rest, the angular displacement between the web 7 and the guide washers 9a, 9b in the second direction of rotation reaches a sixth threshold A6 of angular displacement between the web 7 and the guide washers 9a, 9b. In that case, the torsional damper has an angular position of maximum angular displacement. In other words, for torques greater than the torque that produces an angular displacement equal to the sixth threshold A6, there is no further damping of the torque.

A sixth threshold A6 may be obtained by a stop and/or may correspond to the maximum compression of the spring.

The torsional damping device is a seventh stop b7 supported by the web 7, the angular displacement between the web 7 and the second rotating element 9 in the second direction of rotation from the relative angular position of rest being between the web 7 and the second rotating element 9 a seventh stop b7 arranged to interact with an eighth stop b8 carried by the second guide washer 9b when a sixth threshold A6 of angular displacement between the guide washers 9a, 9b is reached; , prepare.

A seventh stop b7 is formed on a hook 43 which also forms a third stop b3.

A seventh stop b7 and a third stop b3 are formed at two circumferentially opposite edges of the hook 43 .

An eighth stop b8 is formed on a first tooth 42 which also forms a second stop b2.

The second bearing surface 25b of each additional spring 25 is directly or Arranged to provide indirect support.

If the angular displacement between the web 7 and the guide washers 9a and 9b in the second direction of relative rotation is greater than or equal to a fourth threshold value A4 of angular displacement, the first bearing surface 25a is aligned with the second working surface 48 of the web 7. can directly or indirectly support

The first bearing surface 25a of each additional spring 25 is positioned opposite the first peripheral edges 47a2, 47b2 of the openings 47a, 47b in the first and second transmission plates 17a, 17b associated with said additional spring 25. It is also arranged for direct or indirect support against the peripheral edges 47a1, 47b1.

Optionally, additional springs 25 are provided on the one hand against the first peripheral edges 47a2, 47b2 of the openings of the first and second transmission plates 17a and 17b and on the other hand on their second peripheral edges 47a1, 47b2. In contrast, it is fitted with a tight fit or fixed by clamping. Each additional spring 25 may also be prestressed in its housing L.

The damping device 1 also includes a friction device F intended to dissipate the energy of the spring and avoid vibration phenomena. In this case, the friction device F is arranged to rub only in the direction of the reverse transmission. Regarding the characteristics of this friction device, reference may be made to the French patent application having application number 1758778. Other conventional friction devices are also conceivable.

- in each damping module M1, M2 a first bearing seat 77 between the web 7 and the first spring 13-1 on the one hand and the first spring 13-1 of each damping module and the guide washer 9a, 9b on the other hand; intervene between Similarly, a second bearing seat 78 is interposed between the web 7 and the second spring 13-2 on the one hand and between the guide washers 9a, 9b and the second spring 13-2 on the other hand.

A first bearing surface 74 of web 7 has a first notch 76 arranged to accommodate a pivot projecting from first seat 77 . Similarly, the second bearing surface 73 of web 7 has a second notch 75 arranged to accommodate a pivot projecting from a second seat 78 . The third bearing surface 94 has a third notch 96 positioned to accommodate the pivot projecting from the first seat 77 . The fourth bearing surface 93 also has a fourth notch 95 positioned to accommodate a pivot projecting from the second seat 78 .

In a second embodiment shown in FIGS. 9 and 10, a third bearing seat 79 is interposed between the phase member 15 and the first spring 13-1 and a fourth bearing seat 80 is the second bearing seat 80 of each damping module. It is interposed between the spring 13-2 and the phase member 15.

A second bearing seat if the angular displacement between the web 7 and the guide washers 9a and 9b in the first direction of relative rotation is greater than or equal to a second threshold value A2 of the angular displacement between the web 7 and the guide washers 9a and 9b. 78 and fourth bearing seat 80 are positioned to contact each other. In other words, the first stop b 1 is formed on the fourth bearing seat 80 and the second stop b 2 is formed on the second bearing seat 78 .

Each bearing seat 78, 80 has a cover arranged to radially retain the spring it supports against centrifugal forces. A first stop b 1 is formed at one end of the cover of the fourth bearing seat 80 and a second stop b 2 is formed at one end of the cover of the second bearing seat 78 .

A third embodiment is shown in FIGS.

The two axial retaining elements of each transmission head 17 are formed by eyecups 118a and 118b. A first transmission plate 17a and a second transmission plate 17b associated with a group of springs are each provided with an eyecup 118a, 118b. To facilitate the creation of the eyecup, two cuts are made in each plate circumferentially on either side of the portion of the plate intended to form the eyecup.

One of the peripheral edges of each eyecup 118a, 118b forms the damper first stop b1 and the other peripheral edge of the eyecup forms the damper fifth stop b5.

Thus, when the angular displacement between the web 7 and the guide washer in the first direction of relative rotation is greater than or equal to the second threshold value A2 of angular displacement, each eyecup 118a, 118b is positioned at the second stop b2 of the guide washer 9b. is arranged to bear against the first tooth 142 forming the .

Conversely, each eyecup 118a, 118b is adapted to the sixth stop of the guide washer 9b when the angular displacement between the web 7 and the guide washer in the second direction of relative rotation is greater than or equal to a fifth threshold value of angular displacement A5. It is arranged to bear against a second tooth 144 forming part b6.

The guide washers 9a and 9b are provided with recesses E4 extending between the first tooth 142 and the second tooth 144 to allow movement of the eyecups 118a and 118b for each attenuation module.

Each transmission plate 17a, 17b also includes a first centering member 65a, 65b located inside the first end 13-11 of the first spring 13-1 and the first end 13 of the second spring 13-2. -21, second centering members 66a, 66b.

Each centering member 65a, 65b, 66a, 66b is a C-shaped curved tongue formed in the metal sheet of the plate.

The tongue forming the first centering member 65a of the first transmission plate 17a and the tongue forming the first centering member 65b of the second transmission plate 17b each form a centering tube 67 for centering the first spring. are arranged axially facing each other so as to Similarly, the tongue forming the second centering member 66a of the first transmission plate 17a and the tongue forming the second centering member 66b of the second transmission plate 17b are centering springs 13-2 for centering the second spring 13-2. They are arranged axially facing each other to form a tube 68 .

Another solution is shown in FIGS. 11 and 12. FIG. In this case, the third bearing seat 179 and the fourth bearing seat 180 are pivotally mounted on the phase member 115 about the same pivot pin 116 .

Therefore, the inclination of the third seat 179 and the inclination of the fourth seat 180 can change depending on the torque transmitted by the damping device and depending on the centrifugal force. A third bearing seat 179 and a fourth bearing seat 180 are pivotally mounted around a spacer 116 for connecting the two phase washers 15a and 15b, the spacer 116 forming a pivot pin for the seats.

The third sheet 179 and the fourth sheet 180 each have an axially overlapping perforated connecting tab 192 so that their holes also overlap, and the pivot pin 116 is connected to the connecting tab of the third sheet 179 . It is inserted through both the holes at 192 and the holes in the connecting tabs 192 of the fourth sheet 180 .

Third seat 179 and fourth seat 180 each have a back bearing surface that interacts with additional spring 25 . These bearing surfaces are formed in notches 193 and 195 in third seat 179 and fourth seat 180 . The third seat 179 is circumferentially interposed between the first spring 13-1 and the additional spring 25, and the fourth seat 180 is circumferentially interposed between the second spring 13-2 and the additional spring 25. do.

In other words, the additional spring 25 is fixed between the third seat 179 via the first bearing surface 25a and the fourth seat 180 via the second bearing surface 25b. A further increase in stiffness can thus be obtained thanks to the pivoting of the seat. In this case the first spring, the second spring and the additional spring are arranged in series with a delayed compression of the additional spring.

The third seat 179 has a first peg 81 located in a recess 197 in the first transmission plate 117a, the end of the recess 197 being able to limit the movement of the first peg 81 and thus the third seat. Limit 179 turns. The third seat also has a second peg 82 located in a recess in the second transmission plate 117b, the end of the recess being able to limit the movement of the second peg 82, thus pivoting the third seat. limit.

The fourth seat also has a first peg 81 located in the recess 198 of the first transmission plate 117a, the edge of the recess being able to limit the movement of the first peg 81 and thus the fourth seat 180 limit the turning of the The fourth seat 180 also has a second peg 82 located in a recess in the second transmission plate 117b, the edge of the recess being able to limit the movement of the second peg and thus the fourth seat 180. Limit turning.

Claims (15)

A torsional damping device for a vehicle transmission chain, comprising:
- a first rolling element (7) for transmitting torque;
- a second rotating element (9) for transmitting said torque;
- at least one damping module (M1, M2) comprising a main damper (A) arranged between said first rolling element (7) and said second rolling element (9), each main damper , a group of springs comprising a first spring (13-1) and a second spring (13-2) arranged in series by a phase member (15), said first spring (13-1) and said second spring (13-2) Springs (13-2) are respectively arranged between the first rotating element (7) and the phase member (15) and between the phase member (15) and the second rotating element (9), and The rotation axis (X ), at least one damping module (M1, M2) allowing relative rotation about
Each damping module (M1, M2) includes an additional spring (25) supported by said phase member (15) to reduce the velocity or torque taken by said first rotating element (7) and said second rotating element (9). In a first direction of relative rotation of said first rotating element (7) with respect to said second rotating element (9) from a static relative angular position without presentation of:
- than a first threshold value (A1) of angular displacement between said first (7) and said second (9) rolling element (7) and said second rolling element (9) ), the additional spring (25) is spaced from the first rolling element (7), thereby separating the phase member (15) and the first rolling element (7). no additional torque can be transmitted by said additional spring (25) between
- if said angular displacement between said first rolling element (7) and said second rolling element (9) is greater than or equal to said first angular displacement threshold (A1), said additional spring (25) is directly or indirectly against the rolling element (7) whereby additional torque is transmitted by said additional spring (25) between said phase member (15) and said first rolling element (7) The torsional damping device is configured to be able to
torsion, characterized in that said phase member comprises a radially extending annular portion arranged radially inwardly of said first spring (13-1) and said second spring (13-2). attenuation device. Each additional spring (25):
- a first bearing surface (25a) arranged to rest directly or indirectly against said phase member (25);
- if said angular displacement between said first rotational element (7) and said second rotational element (9) in said first direction of relative rotation is greater than or equal to said first angular displacement threshold (A1), said 2. A helical spring according to claim 1, comprising a second bearing surface (25b) which can rest directly or indirectly against the first working surface (40) of the first rolling element (7). Torsional dampener. said angular displacement between said first rotating element (7) and said second rotating element (9) in said first direction of relative rotation from said relative angular position of rest, said first rotating element (7) Said torsional damping device is arranged such that each second spring (13-2) becomes uncompressed when the angular displacement between 3. Torsional damping device according to claim 1 or 2. Said angular displacement between said first rotational element (7) and said second rotational element (9) in said first direction of relative rotation from said relative angular position of rest is said first rotational element (7) and said second rolling element (9) above a second threshold value (A2) of angular displacement to interact with a second stop (b2) carried by said second rolling element (9). 4. A torsional damping device according to claim 3, wherein said torsional damping device comprises a first stop (b1) placed on and supported by said phase member (15). One of said first rolling element (7) and said second rolling element (9) axially rotates said first spring (13-1) and said second spring (13-2) of each group of springs. the other of said first rolling element (7) and said second rolling element (9) is formed by two guide washers (9a, 9b) holding on to the two guide washers (9a, 9b) A torsional damping device according to any one of the preceding claims, formed by webs (7) arranged axially therebetween. Said additional spring (25) of a damping module (M1, M2) is circumferentially located at least partially between said first spring (13-1) and said second spring (13-2) of said damping module. A torsional damping device according to any one of claims 1 to 5, arranged in parallel. A torsional damping device for a vehicle transmission chain, comprising:
- a first rolling element (7) for transmitting torque;
- a second rotating element (9) for transmitting said torque;
- at least one damping module (M1, M2) comprising a main damper (A) arranged between said first rolling element (7) and said second rolling element (9), each main damper , a group of springs comprising a first spring (13-1) and a second spring (13-2) arranged in series by a phase member (15), said first spring (13-1) and said second spring (13-2) Springs (13-2) are respectively arranged between the first rotating element (7) and the phase member (15) and between the phase member (15) and the second rotating element (9), and The rotation axis (X ), at least one damping module (M1, M2) allowing relative rotation about
Each damping module (M1, M2) includes an additional spring (25) supported by said phase member (15) to reduce the velocity or torque taken by said first rotating element (7) and said second rotating element (9). In a first direction of relative rotation of said first rotating element (7) with respect to said second rotating element (9) from a static relative angular position without presentation of:
- than a first threshold value (A1) of angular displacement between said first (7) and said second (9) rolling element (7) and said second rolling element (9) ), the additional spring (25) is spaced from the first rolling element (7), thereby separating the phase member (15) and the first rolling element (7). no additional torque can be transmitted by said additional spring (25) between
- if said angular displacement between said first rolling element (7) and said second rolling element (9) is greater than or equal to said first angular displacement threshold (A1), said additional spring (25) is directly or indirectly against the rolling element (7) whereby additional torque is transmitted by said additional spring (25) between said phase member (15) and said first rolling element (7) The torsional damping device is configured to be able to
Each damping module (M1, M2) has at least one pair of transmission plates (17a, 17b) supported by said phase member, each pair of transmission plates being axially separated from each other in a first transmission a plate (17a) and a second transmission plate (17b); said first transmission plate (17a) and said second transmission plate (17b) are each connected to a first end ( 13-11) directly or indirectly interacting with the first thrust zone (P1) and directly or indirectly interacting with the first end (13-21) of said second spring (13-2). a working second thrust zone (P2), wherein said first thrust zones of each pair of plates are axially spaced from each other and said second thrust zones of each pair of plates are axially spaced from each other; Separated torsional dampers. Said first transmission plate (17a) and said second transmission plate (17b) of each pair of transmission plates are respectively formed into a first phase washer and a second phase washer, said first phase washer and said second phase washer are axially spaced apart from each other. A torsional damping device for a vehicle transmission chain, comprising:
- a first rolling element (7) for transmitting torque;
- a second rotating element (9) for transmitting said torque;
- at least one damping module (M1, M2) comprising a main damper (A) arranged between said first rolling element (7) and said second rolling element (9), each main damper , a group of springs comprising a first spring (13-1) and a second spring (13-2) arranged in series by a phase member (15), said first spring (13-1) and said second spring (13-2) Springs (13-2) are respectively arranged between the first rotating element (7) and the phase member (15) and between the phase member (15) and the second rotating element (9), and The rotation axis (X ), at least one damping module (M1, M2) allowing relative rotation about
Each damping module (M1, M2) includes an additional spring (25) supported by said phase member (15) to reduce the velocity or torque taken by said first rotating element (7) and said second rotating element (9). In a first direction of relative rotation of said first rotating element (7) with respect to said second rotating element (9) from a static relative angular position without presentation of:
- than a first threshold value (A1) of angular displacement between said first (7) and said second (9) rolling element (7) and said second rolling element (9) ), the additional spring (25) is spaced from the first rolling element (7), thereby separating the phase member (15) and the first rolling element (7). no additional torque can be transmitted by said additional spring (25) between
- if said angular displacement between said first rolling element (7) and said second rolling element (9) is greater than or equal to said first angular displacement threshold (A1), said additional spring (25) is directly or indirectly against the rolling element (7) whereby additional torque is transmitted by said additional spring (25) between said phase member (15) and said first rolling element (7) The torsional damping device is configured to be able to
Each damping module (M1, M2) is a transmission head (17) supported by said phase member (15), said first spring (13-1) and said first spring (13-1) of said group of springs of said damping module. 2 springs (13-2) and a transmission head (17) circumferentially arranged between them, each transmission head (17) comprising a housing (L), inside said housing (L) said damping module of said additional spring (25) is accommodated so that the angular displacement between said first rotating element (7) and said second rotating element (9) in said first direction of relative rotation is equal to said second of angular displacement A torsional damping device for transmitting additional torque between said phase member (15) and said first rotating element (7) when greater than or equal to one threshold (A1). Each damping module (M1, M2) is a transmission head (17) supported by said phase member (15), said first spring (13-1) and said first spring (13-1) of said group of springs of said damping module. 2 springs (13-2) and a transmission head (17) circumferentially arranged between them, each transmission head (17) comprising a housing (L), inside said housing (L) said damping module of said additional spring (25) is accommodated so that the angular displacement between said first rotating element (7) and said second rotating element (9) in said first direction of relative rotation is equal to said second of angular displacement An additional torque is transmitted between the phase member (15) and the first rotating element (7) when greater than or equal to one threshold (A1), according to any one of the preceding claims. Torsional dampener. For each damping module (M1, M2), said transmission head (17) is formed by said pair of transmission plates (17a, 17b), said first transmission plate (17a) and said second transmission plate (17b) each openings (47a, 47b), wherein said opening (47a) in said first transmission plate (17a) and said opening (47b) in said second transmission plate (17b) correspond to said additional damping module; 11. A torsional damper according to claim 10 in connection with claim 7 or 8, arranged axially opposite each other so as to accommodate the springs (25). Each transmission head (17) further comprises two axial retaining elements (18a, 18b) for axially retaining said additional springs (25) associated therewith, said two axial retaining elements (18a, 18b) for said additional springs (25). Torsion damping device according to any one of claims 9 to 11, wherein two axial retaining elements (18a, 18b) are arranged axially on either side of said additional spring (25). from a static relative angular position in which no speed or torque is exhibited by the first rotating element (7) and the second rotating element (9), opposite to the first direction of relative rotation, the second In a second direction of relative rotation of said first rolling element (7) to rolling element (9):
- said angular displacement between said first rolling element (7) and said second rolling element (9) is the angular displacement between said first rolling element (7) and said second rolling element (9); each additional spring (25) is at a distance from said first rolling element (7) if less than a fourth threshold (A4);
- if said angular displacement between said first rolling element (7) and said second rolling element (9) is greater than or equal to said fourth angular displacement threshold value (A4), each additional spring is applied to said first rolling element ( 7), whereby additional torque is transmitted by each additional spring (25) between said phase member (15) and said first rotating element (7). A torsional damping device according to any one of the preceding claims, wherein the torsional damping device is configured such that the torsional damping device is From said relative angular position of rest, said angular displacement between said first rotating element (7) and said second rotating element (9) in a second direction of relative rotation is Said torsional damping device is arranged such that said second spring (13-2) is not compressed when the angular displacement between said second rotating element (9) is greater than or equal to a fifth threshold (A5), said torsional damping device A stop (b5) is supported by said phase member (15) and defines said angle between said first rotational element (7) and said second rotational element (9) in said second direction of relative rotation. arranged to interact with a sixth stop (b6) carried by said second rotating element (9) when displacement reaches said fifth displacement threshold (A5), said The first transmission plate (17a) and/or said second transmission plate (17b) has a lug (41) forming said first stop (b1) and said fifth stop (b5) also has said lug ( 41) The torsional damping device of claim 7 formed in 41) or claim 13 reciting claim 7. Transmission system comprising a torque limiter comprising a damping device according to any one of claims 1 to 14 and a friction disc, said friction disc being said first rotating element (7) of said damping device and a transmission system integrally provided in rotation with one of said second rotating elements (9, 10).

Images