FR3043157A1 - TORSION OSCILLATION DAMPING DEVICE - Google Patents

Abstract

Device (1) for damping torsional oscillations, comprising: - a support (2), - at least one pendulum body (3) comprising: two pendulum masses (5) and at least one connecting member (6) of the first and second pendulum masses (5) matching said masses, - at least two rolling members (11) associated with the pendulum body (3) each cooperating on the one hand with a raceway (12) defined by the support (2) and on the other hand with a rolling track (13) defined by the pendulum body (3) for guiding the displacement of the pendulum body (3) with respect to the support (2), and - an interposition piece ( 30) having an interposition portion (33) axially disposed between one of said pendulum masses (5) and the support (2), said interposition portion being integral and having an interposition surface (34) selected to prevent contacting in the axial direction between the pendulum mass (5) and each member rolling (11).

Description

Device for damping torsional oscillations

The present invention relates to a device for damping torsional oscillations, in particular for a motor vehicle transmission system.

In such an application, the torsion oscillation damping device can be integrated with a torsion damping system of a clutch capable of selectively connecting the heat engine to the gearbox in order to filter the vibrations due to the acyclisms. of the motor.

Alternatively, in such an application, the torsion oscillation damping device may be integrated with a friction disk of the clutch or with a hydrodynamic torque converter.

Such a device for damping torsional oscillations conventionally implements a support and one or more pendular bodies movable relative to this support, the displacement relative to the support of the pendular bodies being guided by rolling members cooperating with one another. part with bearing tracks secured to the support, and secondly with rolling tracks secured to the pendular bodies. Each pendulum body comprises for example two pendular masses riveted together.

Axial shocks may occur between the pendulum bodies and the support. These shocks can cause premature wear of the elements of the damping device mentioned above and / or generate unwanted noises, especially when these elements are metal.

In order to avoid the occurrence of such shocks, it is known, for example, from application DE 2006 068 556 to arrange the pads axially between the support and the pendular masses of a body. Such pads, however, do not make it possible to overcome the axial shocks that may occur between the one or more rolling members and one and / or the other of the pendular masses of the pendulum body.

There is a need for axial pads to overcome axial shocks that can occur between the running member and the pendulum body. The invention aims to meet this need and it achieves, in one of its aspects, with a device for damping torsional oscillations, comprising: - a support able to move in rotation about an axis, - at least one pendular body, movable relative to the support, comprising: a first and a second pendular masses axially spaced relative to one another and movable relative to the support, the first pendular mass being arranged axially on a first side of the support and the second pendulum mass being arranged axially on a second side of the support, and at least one connecting member of the first and second pendulum masses matching said masses, - minus first and second rolling members associated with the pendulum body each cooperating on the one hand with a raceway defined by the support and on the other hand with a rolling track defined by ar the pendular body for guiding the displacement of the pendular body relative to the support, and - an interposition piece having an interposition portion disposed axially between one of said pendular masses and the support, this interposition portion being of a single holding and having an interposition surface chosen to prevent contact in the axial direction between the pendulum mass and each rolling member. The invention also relates to the interposition piece above considered in isolation.

By interposing axially, the interposition portion allows the existence of an axial gap between the rolling members and the pendular mass with which it is associated. Such an interposed part makes it possible to avoid contact between the pendulum mass and the rolling members, sources of premature wear of the parts and unwanted noises, for at least part of the relative positions of the pendulum body and the support.

The interposition piece is mutualized for the two running gear. This reduces the number of parts needed in the device and therefore the number of operations when mounting this device.

The interposition piece is in particular made of a damping material, such as plastic or rubber.

The interposition piece can be fixedly mounted on one of the pendulum masses and the support.

The interposition surface of the interposition portion may be continuous. This interposition surface may be flat, that is to say without axial projection directed towards the support.

For the purposes of the present application: - "axially" means "parallel to the axis of rotation of the support", - "radially" means "along an axis belonging to a plane orthogonal to the axis of rotation of the support and intersecting this axis of rotation of the support ", -" angularly "or" circumferentially "means" around the axis of rotation of the support ", -" integral "means" rigidly coupled "and, -" direction "must be included in the vectorial sense.

The "pendulum mass" designates, unless otherwise indicated, the pendulum mass with which the interposition piece is associated.

The interposition surface may be chosen to prevent the contacting in the axial direction of: - only the first rolling member and the pendulum mass for certain relative positions of the pendulum body and the support, - only the second rolling member and pendulum mass for other relative positions of the pendulum body and the support.

The interposition portion may for example come successively interpose only between the pendulum mass and the first rolling member and only between the pendulum mass and the second rolling member.

The interposition surface may also be chosen to simultaneously prevent, for all or part of the relative positions of the pendulum body and the support, the coming into contact in the axial direction of each of the rolling members on the one hand and the pendulum mass on the other hand.

The interposition piece may for example be successively interposed: - only between the first rolling member and the pendulum mass, then - between each of the rolling members and the pendulum mass, and finally - only between the second rolling member and the pendulum mass.

Preferably, the interposition surface is chosen to prevent simultaneously for any relative positions of the pendular body and the support, the coming into contact in the axial direction of each of the first and second rolling members on the one hand and the pendulum mass on the other hand. In other words, regardless of its position along the raceway defined by the pendulum body, no rolling member never comes into contact with the pendulum in the axial direction.

The interposition surface may also be chosen to prevent, for all or part of the relative positions of the pendular body and the support, the coming into contact in the axial direction between the pendulum mass and the support.

In addition to avoiding the coming into contact in the axial direction not only between the rolling members and the pendulum mass, the interposing part makes it possible to avoid coming into contact in the axial direction between the support and this same pendulum mass . A special interposing piece to prevent contact between the support and the pendulum mass is not necessary. This further reduces the number of parts needed and therefore the number of operations during assembly of the device.

Certain fractions of the interposition surface can prevent contact in the axial direction between the pendulum mass and the support for certain relative positions of the pendulum body and the support and then these same fractions can prevent contact in the axial direction between the pendulum mass and one of the rolling members for other relative positions. The interposition surface, more precisely the abovementioned fractions, is therefore pooled.

The portion of the interposition surface dedicated to each of the rolling members and to the support is increased. This advantageously allows to distribute the contact forces on the interposition surface and thus to limit the wear of the interposition piece.

The interposition surface may also be chosen so that, when looking at the device in the axial direction, at least one of the rolling members does not protrude radially and, preferably, nor angularly from the interposition piece whatever or the position that can take this running member along the corresponding raceway.

Preferably, the interposition surface can be chosen so that, when looking at the device in the axial direction, none of the rolling members exceeds radially and, preferably, or angularly of the interposition piece whatever the position that these running gear can take along their corresponding raceway. The case where a negligible portion of one of the rolling members protrudes radially and / or angularly is also provided.

The interposition surface is thus maximized to advantageously distribute the contact forces.

The interposition piece may have at least two different types of fixing portion on one of the pendular mass with which it is associated and the support. The fixing portion of the first type may comprise tabs, all configured to exert on one of the pendulum mass and the support a holding force in position in a first direction and the securing portion of the second type may comprise tabs, all configured to exert on one of the pendulum mass and the support a holding force in position in a second direction, different from the first direction.

The two types of fixing portion thus exert a holding force in one direction, different from each other so that a good holding of the interposition piece on one of the mass and the support. In particular, the interposition piece may not pivot with respect to one of the pendulum mass and the support.

Advantageously, the legs of the portions exerting a force in one direction, the shape of these attachment portions is simplified.

Preferably, the second aforementioned direction is orthogonal to the first aforementioned direction.

More preferably, the first direction is substantially radial while the second direction is substantially orthoradial. Alternatively, the first direction may be substantially orthoradial while the second direction may be substantially radial.

Both types of attachment portions may be of identical shape. The attachment portions may be spaced apart from each other.

The attachment portions of the first type can angularly frame the portions of the second type. The portions of the first type may be radially at a greater distance from the axis of rotation of the support than are the securing portions of the second type.

The fixing portions of the first type may be at the same radial distance from the axis of rotation of the support. The fixing portions of the second type may be offset radially and angularly from one another. As a variant, the fixing portions of the second type can be shifted only angularly.

Preferably, the interposition piece comprises two fixing portions of each type.

Each fixing portion may have an axis of symmetry parallel to the axis of rotation of the support. Preferably, each fixing portion comprises two lugs, opposite to its axis of symmetry. These two tabs can each exert a force in the opposite direction and the same direction on one of the pendulum and the support.

The attachment portions, regardless of their type, may extend between an incipient end from the interposition portion and a free end, each attachment tab extending between these ends.

The legs can be connected together by a reinforcement. This reinforcement may extend over a length of between 5% and 65%, especially between 10% and 50%, of the length measured between the two ends of the fixing portion. This reinforcement may be a flange extending from the interposition portion.

Preferably, the attachment portions are force-fitted. Alternatively, each bracket may comprise a hook for snapping the interposition piece on one of the pendulum mass and the support.

The fixing portions can be received in slots of one of the pendulum mass and the support of substantially oblong shape. Each of the tabs can cooperate with one of the two straight edges of the slot.

These slots may be oriented in different directions, in particular the direction of the slots receiving the first type of fastening portions may be orthogonal to the direction of the slots receiving the fastening portions of the second type.

The specific shape of these slots promotes and orients the thermal expansion of the interposition piece in the direction of these slots. This shape allows the interposition piece to expand and thus avoid the hyperstatic configurations that promote the curl of the interposition piece. The slots being oriented in different directions, preferably orthogonal, the phenomenon of thermal expansion is offset on the scale of the interposition piece.

According to one embodiment of the invention, the interposition piece can be attached to one of the pendular masses of the pendulum body.

The interposition piece may have an outer angular extent larger than its inner angular extent. The inner or outer external angular extent can correspond here to the angle measured from the axis of rotation of the support between the two angular ends of the radially outer edge respectively inside the interposition piece.

The interposition piece may comprise two lugs defining its two angular ends at the radially outer level. These two ears can be connected by an angularly speaking central zone which extends radially beyond the two ears of the interposition piece.

Each ear can be associated with a fixation portion of the first type. The central zone may be associated with at least one fastening portion of the second type, preferably two.

The radially outer edge of the interposition piece may have, at the central zone, a notch. The interposition piece may locally flush a radially outer edge of the pendulum mass. Preferably, the interposition piece can be flush in two disjoint areas, in particular on either side of the notch, on the radially outer edge of the pendulum mass.

The interposition piece may be symmetrical with respect to a plane comprising the axis of rotation of the support. Alternatively, only the ears may be symmetrical to each other with respect to a plane containing the axis of rotation of the support.

The interposition piece may be centered on the pendulum mass, that is to say that the plane of symmetry of the interposition piece is also plane of symmetry for the pendulum mass.

According to a first variant, the rolling tracks defined by the pendulum body may be defined by a connecting member. This connecting member, also called "bearing spacer" serves both to secure the pendulum masses of the same pendulum body together and to participate in guiding the displacement of the pendular body relative to the support. The connecting member can then be received in part in a window formed in the support, and the contour of this window can form the running tracks defined by the support.

Preferably, two connecting members, angularly offset, may be provided to match the first and second pendulum masses, and these connecting members may each be arranged in a clean window formed in the support. Part of the contour of each window or a coating deposited on a portion of this contour may form a raceway and each connecting member may define a raceway cooperating with a single rolling member.

Each connecting member may also be received in two openings of the pendulum body, an opening in the first pendulum mass and an opening in the second pendulum mass. The connecting members are for example forced into these openings. Alternatively, the connecting members may be welded or riveted or welded to each of the first and second pendulum masses.

According to this first variant, there may be orthogonal planes to the axis of rotation intersecting both a raceway defined by the pendulum body and a raceway defined by the support.

Still according to this first variant, each running member can be solicited solely in compression between the raceway defined by the support and the raceway defined by the pendulum body.

In a second variant, the pendulum body defines, for each rolling member, two raceways, a raceway defined in the first pendulum mass and a raceway defined in the second pendulum mass. Each pendulum mass has a cavity for each rolling member and a portion of the contour of this cavity defines a rolling track of the pendulum body.

According to this variant, the portion of the rolling member arranged axially between the two pendulum masses can be received in the window of the support, a portion of the contour defines the rolling track of the support. Each rolling member can thus comprise successively: a portion disposed in a cavity of the first pendulum mass and cooperating with the raceway formed by a portion of the edge of this cavity, a portion disposed in the window of the support and cooperating with the raceway formed by part of the contour of this window, and a portion disposed in a cavity of the second pendulum mass and cooperating with the raceway formed by a portion of the edge of this cavity.

According to this second variant, the pendular body may also comprise at least one connecting member, distinct from the rolling members, serving to secure the pendulum masses of the same pendulum body between them. This connecting member can be received in a cavity of the support different from the windows receiving the rolling members.

Still according to this second variant, there may be no orthogonal plane to rotational axis of the support which cuts both a raceway defined by the support and a raceway defined by the pendulum body.

According to the first variant described above, at least one fixing portion of the first type may extend radially beyond an opening of the pendulum mass to which the interposition piece is associated. Preferably, a first type fixing portion extends radially beyond each opening.

At least one securing portion of second type, preferably two, may extend angularly between the openings in one of the pendulum masses.

The interposition portion may be at least partly disposed radially beyond the rolling tracks defined by each connecting member. The portion of the outer contour of the radially interposed portion facing each raceway defined by the connecting members may have substantially the same shape as that of each raceway.

Still according to the first variant, the interposition portion of the interposition piece may comprise a housing cooperating with an axial end of one of the rolling members during all or part of the movement of the rolling member along the rolling track defined by the pendulum body. In addition to reducing or even avoiding axial shocks mentioned above, such an interposing piece cooperates with the rolling member during its displacement to guide this movement. This cooperation of the axial end of the rolling member with the housing can promote the maintenance of the rolling member against the raceway defined by the pendulum body.

The aforementioned housing may come into contact with the axial end of the running gear only in the event of a radial fall of the latter, for example when the vehicle engine is stopped.

The housing defined in the interposition piece can be through, in which case the pendulum mass to which the interposition piece is associated can be hollowed in axial view of the housing. Alternatively, it may be a blind dwelling.

The housing may extend radially beyond one of the openings in the pendulum mass to receive one of the connecting members. The housing may be radially below one of the attachment portions of the first type.

Preferably, the interposition portion may comprise two housings, each housing cooperating with an axial end of a rolling member during all or part of the displacement of said rolling member along the raceway.

Alternatively, the interposition room is devoid of such housing.

In all the foregoing, each of the first and second pendulum masses may be associated with an interposition piece as defined above.

In all of the foregoing: - the torsion oscillation damping device has a rest position in which the pendulum body is subjected to a centrifugal force but not to acyclisms, - the torsion oscillation damping device has a stop position of the pendulum body against the support, at the end of a movement in the trigonometric direction of the pendular body relative to the support from the rest position, and - the torsion oscillation damping device present a stop position of the pendulum body against the support, after a displacement in the non-trigonometric direction of the pendular body relative to the support from the rest position.

Each connecting member may carry at least one abutment damping member for damping the impacts associated with the contacts existing between the connecting member and the support for at least one of the rest position and the stop positions above. The abutment damping member may be a strip or a coating extending along a part of the outline of the connecting member, as disclosed, for example, in DE 201 217 958. Alternatively, abutment member may be as disclosed in the application filed in France on October 14, 2014 under number 14 59836.

It should be noted that other interposing parts may be provided in the device.

In all the foregoing, the device may comprise: at least one first pendular body for filtering a first order value of the torsional oscillations, and at least one second pendular body for filtering a second order value of the torsional oscillations, different from the first order value.

For the purposes of the present application, an order value of the torsional oscillations is filtered when the amplitude at this order value of the torsional oscillations is reduced by the device by a value equal to at least 10% of the amplitude before filtering.

Since the device is configured to filter orders, the frequency of the torsional oscillations filtered by the first, respectively second, pendular bodies varies as a function of the speed of rotation of the support. The use of the term "order" implies dealing with variable frequencies.

In all the above, each running member is for example a roll of circular section in a plane perpendicular to the axis of rotation of the support. The axial ends of the roll may be devoid of a thin annular flange. The roller is for example made of steel, which can be solid or hollow.

In all of the above, the shape of the rolling tracks may be such that the pendulum bodies are only displaced relative to the support in translation about a fictitious axis parallel to the axis of rotation of the support.

As a variant, the shape of the rolling tracks may be such that the pendular bodies are displaced with respect to the support both: in translation around a notional axis parallel to the axis of rotation of the support and also in rotation around the center of gravity of said pendulum body, such a movement being again called "combined movement" and disclosed for example in the application DE 10 2011 086 532.

In all of the above, the support may or may not be made in one piece.

The device comprises for example several pendulous bodies, for example a number between two and eight, including four, five or six pendulous bodies. The pendular bodies can be uniformly distributed around the periphery of the support axis. All these pendular bodies can be received in the same axial space. Another subject of the invention, according to another of its aspects, is a component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter or a friction disk, comprising a device damping torsional oscillations as defined above.

The support of the torsion oscillation damping device can then be one of: - a web of the component, - a guide washer of the component, - a phasing washer of the component, or - a separate support of said web, said guide ring and said phasing washer.

This component can be integrated with a powertrain, for example a two, three or four-cylinder heat engine. The subject of the invention is also an interposition piece which may have an angular extent of between 50% and 90%, preferably between 60% and 80%, more preferably between 65% and 75% with respect to the angular extent of the pendulum mass.

This interposition piece can be integrated in the device presented above. All that has been described above can be checked independently or in combination for this interposition piece. The invention will be better understood on reading the following description of non-limiting examples of implementation thereof and on examining the appended drawing in which: FIG. 1 represents schematically and partially a torsion damping device according to the invention is exploded; FIG. 2 represents an interposition piece of FIG. 1; FIG. 3 represents a detail of FIG. 2; FIG. 4 represents a detail of the device of FIG. FIG. 1 represents one of the pendulum masses of FIG. 1 according to a different point of view; FIG. 6 represents a variant of FIG. 5; and FIGS. 7 and 8 represent two distinct positions of FIG. a second example of a device according to the invention.

There is shown in Figure 1 a damping device 1 which are integrated interposing parts 30 according to the invention. These interposition pieces 30 are also called "pads". The damping device 1, oscillating oscillator type, is particularly suitable for equipping a motor vehicle transmission system, being for example integrated with a component not shown of such a transmission system, this component being for example a double steering wheel damper, hydrodynamic torque converter or friction disc.

This component can be part of a propulsion system of a motor vehicle, the latter comprising a thermal engine including two, three or four cylinders.

In Figure 1, the device 1 is in the rest position, in which a pendulum body 3 is subjected to a centrifugal force but not to acyclisms.

In known manner, such a component may comprise a torsion damper having at least one input element, at least one output element, and circumferentially acting resilient return members which are interposed between said input and output elements. . For the purposes of the present application, the terms "input" and "output" are defined with respect to the direction of torque transmission from the engine of the vehicle to the wheels of the latter.

The device 1 comprises in the example under consideration: a support 2 able to move in rotation about an axis X, and a plurality of pendular bodies 3 movable relative to the support 2.

In the example, four pendulous bodies 3, distributed uniformly around the periphery of the axis of rotation X, are provided.

The support 2 of the device 1 may consist of: - an input element of the torsion damper, - an output element or an intermediate phasing element disposed between two series of spring of the damper, or - an element he rotated to one of the aforementioned elements and distinct from the latter, then being for example a support specific to the device 1.

The support 2 is in particular a guide washer or a phasing washer.

In the example, the support 2, made in one piece, generally has a ring shape having two opposite sides 4 which are here planar faces.

As can be seen in particular in FIG. 1, each pendulum body 3 comprises in the example under consideration: two pendular masses 5, axially spaced from one another and movable relative to the support 2, a first pendulum mass 5 being arranged axially on a first side 4 of the support 2 and a second pendulum mass 5 being arranged axially on a second side 4 of the support 2, and - two connecting members 6 of the first and second pendulum mass 5 matching said masses.

The connecting members 6, also called "rolling spacers", are in the example considered angularly offset.

Each connecting member 6 is partially received in a window 9 formed in the support. In the example considered, the window 9 defines a blank space inside the support 2, this window being delimited by a closed contour 10.

The device 1 also comprises, in the example under consideration, rolling members 11 guiding the displacement of the pendular bodies 3 with respect to the support 2. The rolling members 11 are here rollers, for example of steel, of which at least one portion has a circular cross section of radius R.

In the example described, each of the two rolling members 11 cooperates with one of the connecting members 6 of the pendulum body 3.

Each rolling member 11 cooperates on the one hand with a rolling track 12 defined by the support 2, and which is here formed by a portion of the contour 10 of the window 9, and on the other hand with a rolling track 13 defined by the pendulum body 3, which is here defined by one of the connecting members 6. More specifically, the raceway 13 is here formed by a portion of the outer edge of the connecting member 6.

Each rolling member 11 interacts radially internally with the rolling track 13 and at the radially outer level with the rolling track 12 during its displacement relative to the support 2 and the pendulum body 3, being for example only stressed in compression between the rolling tracks 12 and 13. As shown in FIG. 1, the rolling tracks 12 and 13 have, in the example described, portions that are radially facing one another, that is to say that there are orthogonal planes to the axis of rotation X intersecting both said rolling tracks 12 and 13.

In the example considered, the device 1 comprises abutment damping members 25 and each of the connecting members 6 carries one of these abutment damping members 25.

As shown in Figure 1, these abutment damping members 25 may be in the form of a coating surrounding in a plane orthogonal to the axis of rotation a portion of the edge of the connecting member. Alternatively, these abutment damping members 25 may be as described in the application filed in France on October 14, 2014 under number 14 59836.

These abutment damping members 25 serve to dampen the shocks associated with the abutment against the support 2 of the pendulum body 3 at the end of a displacement from the rest position, whatever the direction of this displacement. . Such displacement occurs in planes orthogonal to the axis of rotation X, and not axially. The abutment damping members 25 may furthermore make it possible to damp the shocks associated with the radial drop of the pendulum body 3 for low speeds of rotation of the engine of the vehicle, for example during the starting or stopping of the vehicle .

The interposing parts 30 of the device 1 described in FIG. 1 will now be described in FIGS. 2 to 5 and then a second example of implementation of these interposing parts 30 will be represented in FIG.

In the two examples considered, the interposition piece 30 is associated with one of the pendulum masses 5 of one of the pendulum bodies 3 and each pendulum mass 5 of this pendulum body 3 can be associated with an interposition piece 30 which is clean. According to a variant not shown, such interposition pieces can also be carried by the support.

In the example considered in FIGS. 2 to 5, the interposition piece 30 is arranged so as to prevent the coming into contact in the axial direction, that is to say along the axis of rotation X, between the mass pendulum 5 with which it is associated and each of the two rolling members 11 associated with the pendulum body 3. The interposition piece 30 has: - a continuous interposition portion 33 disposed axially between the pendulum mass 5 and the support 2, this interposition portion 33 being integral and having an interposed surface 34 selected to prevent engagement in the direction of the axis of rotation X between the pendulum mass 5 and each rolling member 11, and two fixing portions on the pendulum mass of a first type 37 and two fixing portions of a second type 38.

The attachment portions of the first type 37 comprise tabs 39, all configured to exert on the pendulum mass 5 a holding force in position in a first direction Di and the fixing portions of the second type 38 comprise tabs 39, all configured to exert on the pendulum 5 a holding force in position in a second direction D2, different from the first direction Di.

In the example considered, the second direction D2 is orthogonal to the first direction Di. More precisely still, the first direction Di is substantially radial whereas the second direction D2 is substantially orthoradial.

The two types of fixing portions 37 and 38 are of identical shape but oriented in different directions, namely Di and D2, and the fixing portions 37 and 38 are spaced from each other.

In the example considered, the interposition portion 33 of the interposition piece 30 has two lugs 42 defining its two angular ends, these two lugs 42 are connected by a central zone 43 which extends radially on both sides 42. The ears 42 are symmetrical to one another with respect to a plane containing the axis of rotation X.

At the radially inner level, the transition between the lugs 42 and the central zone 43 is done by material discontinuity of the interposition portion 33.

With reference to FIG. 7, which will be presented later, the interposition piece 30 may have an outside angular extent greater than its internal angular extent a3. The inner or outer external angular extent can correspond here to the angle measured from the axis of rotation X between the two angular ends of the radially outer edge or inner edge respectively of the interposition piece 30.

In the example considered, each lug 42 is associated with a first type fixing portion 37 and the central zone 43 is associated with two second type fixing portions 38.

The radially outer edge of the interposition piece 30 has a notch 44 remote from each of the ears 43.

In the example considered, the first type of attachment portions 37 are at the same radial distance from the axis of rotation X and they angularly frame the second type of portions 38. These portions of the first type 37 are radially at a greater distance. the axis of rotation X is greater than the second type of fastening portions 38 and these two first type fastening portions 38 are offset radially and angularly from one another.

As will also be seen in FIGS. 5 and 6, the interposition piece 30 is centered on the pendulum mass 5 with which it is associated.

With reference to FIG. 3, the fixing portions 37 and 38 will now be described in greater detail.

In the example considered, the fastening portion of the first type and second type 37, 38 shown has an axis of symmetry parallel to the axis of rotation X. The fastening portion comprises two lugs 39, opposite to the axis of symmetry. As will be seen later, these two tabs 39 each exert a force in the opposite direction on the pendulum mass 5.

As can be seen in FIGS. 2 and 3, the fixing portions 37 and 38, regardless of their type, each extend between an end emerging from the interposing portion 33 and a free end, each attachment lug 39. extending between these ends.

The tabs 39 are interconnected by a reinforcement 45 which extends over a length of between 5% and 65%, especially between 10% and 50%, of the length measured between the two ends of the fixing portion 37. the example considered, this reinforcement 45 is a flange extending from the interposition portion 33.

The reinforcement 45 can give the interposition piece 30 better resistance to the shear forces applied to the latter during the displacement of the pendulum body 3 relative to the support 2.

With reference to FIG. 4, the fixing portions 37 and 38 can be force-fitted onto the pendulum mass 5.

The fixing portions 37 and 38 are received in slits 46 of substantially oblong shape formed in the pendulum mass 5 to which the interposition piece 30 is associated.

The reinforcement 45 can make it possible to center the interposition piece 30 in the slot 46 formed in the pendulum mass 5 and each tab 39 cooperates with one of the two straight edges 47 of the slot 46.

In the example considered, the direction D3 of the slots 46 receiving the first type of fixing portions 37 is orthogonal to the direction D4 of the slots 46 receiving the securing portions of the second type 38. Note that D3 is orthogonal to Di and that D4 is orthogonal to D2.

The specific shape of these slots 46 promotes and directs the thermal expansion of the interposing part 30 in the directions D3 and D4 these slots 46. This shape allows the interposition piece 30 to expand and thus avoid the configurations hyperstates that favor the curling of said piece. Since the slots 46 are oriented along orthogonal directions D3 and D4, the phenomenon of thermal expansion is compensated on the scale of the interposition piece 30.

In the example considered and with reference to FIG. 5, it is observed that each connecting member 6 is received in two openings 50, an opening 50 formed in the first pendulum mass 5 and an opening 50 formed in the second pendulum mass 5. The connecting members 6 are for example force-fitted into these openings 50.

In the example under consideration, a first type fixing portion 37 extends radially beyond each opening 50 and the two second type fixing portions 38 extend angularly between the openings 50.

The interposition portion 33 is disposed radially outwardly relative to the rolling tracks 13 defined by each connecting member 6. The portion of the outer contour of the interposition portion 33 radially facing each raceway 13 has substantially the same The example of implementation of the interposition piece 30 shown in FIG. 6 differs from that of FIGS. 2 to 5 in that the interposition portion 33 comprises two housings. therethroughs 52, each cooperating with an axial end of one of the rolling members 11 during all or part of the displacement of the rolling member 11 along the rolling track 13. The pendulum mass 5 is also hollowed against each housing 52 to receive the axial end of the rolling member 11.

In the example considered, a housing 52 extends radially beyond each opening 50 and radially below one of the two attachment portions of the first type 37.

The interposition piece 30 of FIG. 6 also differs from that of FIGS. 2 to 5, in that the second type fastening portions 38 are aligned in an orthoradial direction.

This interposition piece 30 differs finally from that of FIGS. 2 to 5 in that it is locally exposed on a radially outer edge of the pendulum mass in two disjoint zones located on either side of the notch 44.

Finally, FIGS. 7 and 8 show a second example of the device 1 according to two distinct positions. In FIG. 7, the device 1 is in a rest position and at the end of a displacement of the pendular bodies 3 with respect to the support 2 from this rest position in the trigonometric direction, the device 1 can be in a position abutment of the pendulum bodies 3 against the support 2 as shown in FIG. 8.

In this abutment position, the abutment members 25 are in contact with the contour 10 of the windows 9 and thus make it possible to dampen the shocks between the support 2 and the connecting members 6 of a pendular body 3.

With reference to FIGS. 7 and 8, the interposition piece allows the existence of an axial gap between the rolling members 11 and the pendulum mass 5.

With reference to FIG. 7, the interposition piece 30 has an angular extent α 1, which is here the angular extent of its radially outer edge, of between 65% and 75% of the angular extent α 2 of the pendulum mass 5 This allows that in the stop position, none of the rolling members 11 angularly exceeds the interposition piece 30.

As can be seen in FIGS. 7 and 8, the interposition surface 34 can also be chosen so that none of the rolling members 11 protrude radially from the interposition piece 30, except for its possible axial end co-operating with the housing 52, as shown in Figure 6.

The interposition surface 34 is therefore advantageously chosen to prevent the coming into contact in the axial direction between each of the rolling members 11 and the pendulum mass 5, especially for these two positions of the pendulum body 3 and the support 2 shown.

What is observed in these figures can also be verified for the transient positions between the rest position and the stop position shown. All that has been said for the stop position in the trigonometric direction can also apply in the non-trigonometric sense. Other interposing pieces may be provided in the device 1 in addition to the interposition piece 30. The invention is not limited to the examples which have just been described.

Claims (12)

claims 1. Device (I) for damping torsional oscillations, comprising: - a support (2) able to move in rotation about an axis (X), - at least one pendulum body (3) comprising; a first and a second pendular mass (5) axially spaced from one another and movable relative to the support (2), the first pendulum mass (5) being arranged axially on a first side (4) of the support (2) and the second pendulum mass (5) being arranged axially on a second side (4) of the support (2), and at least one connecting member (6) of the first and second pendulum masses (5). ) pairing said masses, - at least a first and a second rolling members (11) associated with the pendulum body (3) each cooperating on the one hand with a raceway (12) defined by the support (2) and d ' on the other hand with a rolling track (13) defined by the pendulum body (3) to guide the displacement of the pendulum body (3) relative to the support (2), and - an interposition piece (30) having a portion of inteiposition (33) arranged axially between one of said pendulum masses (5) and at least one two rolling members (11), said interposition portion being integral and having an interposition surface (34) selected to prevent contacting in the axial direction between the pendulum mass (5) and each member rolling (11), 2. Device according to claim 1, the interposition surface being chosen to prevent only coming into contact in the axial direction: - the first rolling member (11) and the pendulum mass (5) for certain relative positions of the body pendulum (3) and the support (2), - the second rolling member (11) and the pendulum mass (5) for other relative positions of the pendulum body (3) and the support (2). 3. Device according to claim 1 or 2, the interposition surface (34) being chosen to simultaneously prevent, for all or part of the relative positions of the pendulum body (3) and the support (2), the coming into contact according to the axial direction (X) of each of the first and second rolling members (11) on the one hand and the pendulum mass (5) on the other hand. 4. Device according to any one of the preceding claims, the interposition surface (34) being chosen to prevent, for all or part of the relative positions of the pendular body (3) and the support (2), the coming into contact according to the axial direction (X) between the pendulum mass (5) and the support (2). 5. Device according to any one of the preceding claims, the interposition surface (34) being chosen so that, when looking at the device in the axial direction, at least one of the rolling members (11) does not protrude radially. of the interposition piece (30). 6. Device according to one of the preceding claims, the interposition piece comprising at least two different types of attachment portion (37, 38) on one of the pendulum masses (5) or the support (2), the portion fastener of the first type (37) having tabs (39), all configured to exert on one of the pendulum mass (5) and the support (2) a holding force in position in a first direction (Di) and the securing portion of the second type (38) having tabs (39), all configured to exert on one of the pendulum mass (5) and the support (2) a holding force in position in a second direction (D2), different from the first direction (DO- 7. Device according to the preceding claim, the second direction (D2) of force being orthogonal to the first direction (Di) effort. 8. Device according to one of claims 6 and 7, the fixing portions of first (37) and second type (38) being received in slots (46) of one of the pendulum masses (5) and the support (2) of substantially oblong shape. 9. Device according to one of the preceding claims, the interposition piece (30) being fixed to the pendulum mass (5) which is associated. 10. Device according to the preceding claim, the rolling tracks (13) defined by the pendulum bodies (3) being each secured to a connecting member (6), each connecting member (6) being associated with an opening (50). ) formed in the pendulum mass (5), a first type fixing portion (37) being radially beyond each of said openings (50) and at least one second type fixing portion (38) being angularly between said openings (50). 11. Device according to the preceding claim, the interposition portion (33) comprising at least two housings (52), each housing (52) cooperating with an axial end of a rolling member (1 1) at all or part of the displacement of said rolling member along the rolling track (13) defined by the pendulum body (3). 12. Component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter or a friction disc, comprising a damping device (1) according to any one of the rectifications 1 at 11.