FR3082904A1 - DEVICE FOR DAMPING TORSIONAL OSCILLATIONS - Google Patents

Abstract

Device (1) for damping torsional oscillations comprising: - a support (2) movable in rotation about an axis (X), - a plurality of pendular bodies mounted mobile on the support (2), each of the bodies pendulars being circumferentially adjacent to another pendulum body in order to form a set of two circumferentially consecutive pendulum bodies, said assembly comprising a first adjacent pendulum body (3b) and an interposed pendulum body (3a) circumferentially adjoining the first adjacent pendulum body, in which the interposed pendulum body (3a) is guided in oscillation on the support by a rolling member and by an articulation (20) with the first adjacent pendulum body (3b), the articulation (20) being arranged so as to limit the displacement of the intercalated pendulum body (3a) relative to the first adjacent pendulum body (3b) and to synchronize said displacement with respect to the displacement of said first adjacent pendulum body (3b).

Description

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

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

As a variant, in such an application, the device for damping torsional oscillations can be integrated into a friction clutch disc or a hydrodynamic torque converter.

Such a device for damping torsional oscillations conventionally implements a support and one or more pendulum bodies movable relative to this support, the displacement relative to the support of each pendulum body being guided by two rolling members cooperating on the one hand with raceways integral with the support, and on the other hand with raceways integral with the pendular bodies. Each pendulum body comprises for example two pendulum masses riveted together.

It is known to choose the damping device, for example via the shape of the tracks, so that the latter filters the order of excitation of a two-cylinder engine of the vehicle, also called "order 1 ”, the order of excitation of a heat engine being in known manner the number of explosions of this engine per revolution of the crankshaft. Such devices are very sensitive to the force of gravity, the latter then being able to cause undesired displacements of the pendulum bodies, and therefore affect the filtering performance.

To remedy this problem, it is for example known from application FR3013415 A1 to provide a device for damping torsional oscillation in which the movement of each pendulum body is guided by a single rolling member and by an articulation with the two circumferentially adjacent pendulum bodies. This torsional oscillation damping device advantageously combines great simplicity of construction, close to that of a single-wire pendulum device, and damping performance close to that of a two-wire pendulum device.

Although the torsional oscillation damping device described in FR3013415 A1 is satisfactory, it is still possible to improve said device especially for the case where the pendulum bodies which compose it exhibit non-homogeneous displacements.

An object of the invention is to meet this need.

Another object of the invention is to reduce the influence of gravity on the pendulum bodies of the device,

The invention achieves this, according to one of its aspects, by means of a device for damping torsional oscillations, in particular intended to be integrated in a transmission chain of a motor vehicle, comprising:

- at least one mobile support rotating around an axis,

- A plurality of pendulum bodies mounted movable on the support, each of the pendulum bodies being circumferentially adjacent to at least one other pendulum body in order to form at least one set of at least two circumferentially consecutive pendulum bodies, said at least one set comprising a first adjacent pendulum body and an interleaved pendulum body circumferentially adjoining the first adjacent pendulum body, in which the interleaved pendulum body is guided in oscillation on the support by at least one rolling member and by at least one articulation with the first adjacent pendulum body , said at least one articulation being arranged so as to limit the movement of said pendulum body inserted with respect to the first pendulum body and to synchronize said movement with respect to the movement of said first adjacent pendulum body.

Such a joint has a double function. First of all, it makes it possible to limit the movement of the pendulum body inserted under the effect of gravity and therefore hinders the action of gravity on it. When the support rotates, each pendulum body successively occupies the highest position around the rotation rate of the support. An intercalated pendulum body occupying such a position is connected via the articulation to another adjacent pendulum body which is lower and therefore less subject to the action of gravity. The downward displacement of the intercalated pendulum body, here the highest pendulum body, is transmitted via the articulation to this other adjacent pendulum body which then opposes this downward displacement.

The articulation is advantageously dimensioned so as to reduce the displacement of the intercalated pendulum body under the effect of gravity without affecting the filtering performance of torsional oscillations by the displacement of said intercalated pendulum body.

In addition, the articulation makes it possible to brake the intercalated pendulum body and therefore to reduce the noise due to the impact between a part of said intercalated pendulum body and a part of the support. These shocks correspond for example to the abutment of the pendulum body interposed against the support hey to the radial fall of said pendulum body interposed when the vehicle engine is stopped.

Secondly, the articulation makes it possible to synchronize the displacement of the interchangeable pendulum body with respect to the displacement of at least one of the adjacent pendulum bodies.

In optimal operation, the pendulum bodies of the set of at least two circumferentially consecutive pendulum bodies operate in a coordinated fashion. Thus, the two adjacent pendular bodies typically have, at a given instant, a coordinated circumferential movement, or synchronized and exactly in the same direction (collective rotation movement), and / or a pivoting movement also coordinated, or synchronized, and in the same direction, and / or a movement of radial displacement also coordinated, or synchronized, and in the same direction (centrifugal or centripetal). These homogeneous displacements increase the overall filtration performance of the torsional oscillation damping device. Under these conditions, there is a minimum of relative movement between the pendulum bodies, preferably only of the relative translation. However, the intercalated pendulum body may have a travel, or displacement, greater than that of the adjacent pendulum bodies. This non-homogeneous displacement results in desynchronization of the pendulum bodies and a reduction in the overall filtration performance of the torsional oscillation damping device. The articulation according to the invention makes it possible to return to a state in which the displacements of the various intercalated and adjacent pendulum bodies are synchronized.

Within the meaning of this request:

- "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",

- "orthoradially" means "perpendicular to a radial direction", and

- "united" means "rigidly coupled".

The thickness of a part refers to a dimension measured along the X axis.

Still within the meaning of the present application, the rest position of the device is the position of the latter in which the pendulum bodies are subjected to a centrifugal force, but not to torsional oscillations originating from the acyclisms of the heat engine.

By motor vehicle is meant not only passenger vehicles, but also industrial vehicles, which notably includes heavy goods vehicles, public transport vehicles or agricultural vehicles.

By "articulation" between two adjacent pendulum bodies is meant a connection allowing rotation of one of these pendulum bodies relative to the other, about an axis parallel to the axis X of the support. A "joint" is not incompatible with a sliding between said pendulum bodies. A joint can be obtained by cooperation of male and female parts of said adjacent pendulum bodies or by means of a joint piece, interposed between said pendulum bodies.

Each of the pendulum bodies of the plurality of pendulum bodies mounted movably on the support of the device for damping torsional oscillations according to the invention can be circumferentially interposed between two adjacent pendulum bodies in order to form at least one set of three bodies. circumferentially consecutive pendulum, said at least one assembly comprising a first adjacent pendulum body, a second adjacent pendulum body and an interposed pendulum body inserted circumferentially between the first adjacent pendulum body and the second adjacent pendulum body, in which the intercalated pendulum body is guided oscillation on the support by at least one rolling member and by at least one articulation with at least one of the first and second adjacent pendulum bodies, said at least one articulation being arranged so as to limit the displacement of said pendulum body inserted with respect to the less one of the first and second adjacent pendulum bodies and to synchronize said displacement with respect to the displacement of at least one of the first and second adjacent pendulum bodies.

When the assembly comprises three circumferentially consecutive pendulum bodies, the first and second adjacent pendulum bodies typically have, at a given instant, a circumferential movement coordinated, or synchronized, with that of the pendulum body interposed and in exactly the same direction (rotational movement collective), and / or a pivoting movement also coordinated, or synchronized, and in the same direction, and / or a radial movement movement also coordinated, or synchronized, and in the same direction (centrifugal or centripetal). These homogeneous displacements increase the overall filtration performance of the torsional oscillation damping device.

However, the intercalated pendulum body may momentarily have a travel, or displacement, greater than one or two adjacent pendulum bodies. This nonhomogeneous displacement results in desynchronization of the pendulum bodies and a reduction in the overall filtration performance of the torsional oscillation damping device, in particular of the effective torque. The articulation according to the invention makes it possible to return to a state in which the displacements of the various intercalated and adjacent pendulum bodies are synchronized.

At least one of the pendulum bodies inserted in the torsional oscillation damping device may comprise a single articulation with one of the first or second adjacent pendulum bodies.

Alternatively, all of the pendulum bodies interposed in the torsional oscillation damping device may comprise a single articulation with one of the first or second adjacent pendulum bodies.

This unique articulation performs the same functions as described above.

The at least one articulation of the device comprises a male part and a female part, the male part being adapted for, during a desynchronization of the movement of the pendulum body interposed with the movement of the first adjacent pendulum body, come into sliding contact with the female part in order to resynchronize said intercalated pendulum body.

When the assembly comprises three pendular bodies, the male part of the at least one articulation is suitable for, during a desynchronization of the movement of the pendulum body inserted with the displacement of at least one of the first and second adjacent pendulum bodies, come into sliding contact with the female part in order to resynchronize said intercalated pendulum body.

To limit the noise of the device, it is possible to modify the structure of the pendulum bodies, for example by shortening the dimensions of a pendulum body interposed in the circumferential direction in order to eliminate the possible contacts between said pendulum body interposed and the adjacent pendulum bodies. . It is these modifications of dimensions which can cause desynchronization of the deflections of the various pendulum bodies.

Thus, when the displacements of the various pendulum bodies are out of sync, the male part of the joint can come into sliding contact on the female part in order to resynchronize said pendulum body interposed with at least one of the first and second adjacent pendulum bodies. This sliding contact can create friction between the two pendulum bodies. This coming into sliding contact on the female part of the male part of the joint also makes it possible to almost instantly stop any risk of desynchronization between the various pendulum bodies.

The male part of the at least one articulation of the device is suitable for, during a rotation of the support, rub against said support or against the first adjacent pendulum body. Alternatively, when the assembly includes three pendulum bodies, the male part is adapted to rub against one of the first and second adjacent pendulum bodies.

The at least one articulation according to the invention involves the presence of friction surfaces between the interposed pendulum bodies and the support or the first pendulum body or one of the first and second adjacent pendulum bodies. These friction surfaces in particular use axial friction, that is to say that the friction surfaces cooperate with each other are facing each other axially.

These friction surfaces allow the appearance of a hysteresis phenomenon for the displacement of the intercalated pendulum body, the displacement under the effect of the gravity of said intercalated pendulum body being braked.

The male part of the at least one articulation of the device can be at a distance from an internal edge of the female part when the movement of the intercalated pendulum body is synchronized with the movement of the first adjacent pendulum body or, when the assembly comprises three pendulum bodies, with the displacement of at least one of the first and second adjacent pendulum bodies.

Thus, when the movements of the different pendulum bodies are synchronized, the intercalated pendulum body is not in contact with the adjacent pendulum body (s). More particularly, the male part of the joint is not in contact with the female part of the joint. Manufacturing tolerances can cause contact, but in all cases this contact is minimal.

From the mechanical point of view, the joint can be considered as a slide. The articulation mainly allows a relative translation between two consecutive pendular bodies. If the synchronization is perfect then the relative displacement between the two pendulum bodies is a translation and there is no radial contact between the two pendulum bodies. When there is desynchronization, an additional radial displacement component appears and the two pendulum bodies move radially closer together. This radial approximation creates a radial contact between the two consecutive pendulum bodies

The male part of the at least one joint can be at a minimum distance of 0.1 mm (millimeter) from the inner edge of the female part.

The male part of the at least one articulation can be made of several distinct materials. The portion of the male part rubbing against one of the pendular bodies or against the support is for example made of a material suitable for friction, for example steel.

The male part of the joint may have a fixing portion on one of the two pendulum bodies and a free end rubbing against the other of the two pendulum bodies or against the support. The free end of the male part can be curved. The free end of the male part can be circular.

The male part of the at least one articulation of the device can have the shape of a hook or articulation finger. More particularly, the free end of the male part may have the shape of a hook or a hinge finger.

The hook shape of the male part makes it possible to increase the flexibility of the at least one articulation and to increase its capacity for absorbing the shocks linked to the radial fall of the pendular bodies at the time of starting or stopping the engine.

The inner edge of the female part of the joint can have a slope of 0% +/- 10%. The slope is the tangent of the inclination between two points of a line.

The male part and / or the female part of the at least one articulation extend according to a normal to a radial straight line to the axis of rotation of the support.

The assembly further comprises a second adjacent pendulum body, the interchangeable pendulum body being inserted circumferentially between the first adjacent pendulum body and the second adjacent pendulum body, the intercalated pendulum body being guided in oscillation on the support by a first articulation with the first adjacent pendulum body and by a second articulation with the second adjacent pendulum body.

The intercalated pendulum body may further comprise an axial shoe, said shoe extending circumferentially between a first end edge and a second end edge, the first end edge comprising the male part of a first articulation and the second end edge comprising the female part of a second articulation.

Thus, the at least one articulation is not directly, that is to say without intermediary, carried by a pendular mass composing a pendular body but is directly, that is to say without intermediary, carried by the skate.

Thus, the lost mass linked to the reduction in the circumferential dimensions of the intercalated pendulum body is recovered by the mass of the skate.

The shoe is adapted to create a friction connection between two circumferentially neighboring pendular bodies.

Within the meaning of the present application, two circumferentially neighboring pendular bodies are connected by a friction connection. The friction connection implies the presence of friction surfaces between the two circumferentially adjacent pendulum bodies, these friction surfaces cooperating so that the displacement of one of these two pendulum bodies is transmitted to the other of these two bodies Pendulum. The friction connection in particular implements an axial friction, that is to say that the friction surfaces cooperating with each other are axially opposite.

The friction connection can allow the appearance of a hysteresis phenomenon for the displacement of the two pendulum bodies which it connects, the displacement under the effect of the gravity of one of these pendulum bodies being transmitted with a certain delay to the other pendulum body.

The device comprises for example a plurality of pads, so that for each pendulum body:

- a friction connection exists with the neighboring pendulum body circumferentially in the trigonometric direction, and

- A friction connection exists with the neighboring pendulum body circumferentially in the non-trigonometric direction.

All pendulum bodies can thus be connected two by two by a friction connection.

If the number of pendulum bodies making up the torsional oscillation damping device is even, a single shoe can be fixed on two circumferentially adjacent pendulum bodies.

The intercalated pendulum body may comprise at least one pendulum mass having an external face and an opposite internal face, the internal face being situated opposite the support and the external face being situated opposite the shoe.

The articulations of the various pendulum bodies interposed are independent of each other

Each of the pendular bodies of the device can be guided in oscillation on the support by at least one articulation with at least one pendular body circumferentially adjacent, the articulations being independent of each other.

When the assembly comprises three pendulum bodies, the intercalated pendulum body is guided in oscillation on the support by at least one articulation with at least one of the first and second adjacent pendulum bodies, the articulations being independent of each other.

The pendulum bodies of the torsional oscillation damper are independent of each other in their synchronization. That is to say that the different pendulum bodies of the device except one can be synchronized. The independence of the joints from one another makes it possible to synchronize the desynchronized pendulum body or bodies without disturbing the operation of the other pendulum bodies.

In all of the above, the device comprises for example a number of pendulum bodies between two and eight. All these pendulum bodies can succeed one another circumferentially.

The movement of each pendulum body interposed with the device relative to the support can be guided by at least two rolling members, each rolling member cooperating with a first raceway integral with the support and with a second raceway integral with the pendulum body .

The shape of the first and second rolling tracks can be such that each pendulum body is moved relative to the support at the same time:

- in translation around a fictitious axis parallel to the axis of rotation of the support and,

- also rotating around the center of gravity of said pendulum body, such a movement also being called “combined movement” and disclosed for example in application DE 10 2011 086 532.

This combined movement can be qualified as a 100% combined movement. We speak of a 100% combined movement for a pendulum body when, in the device's rest position, in a plane perpendicular to the axis of rotation, the normal in contact between a first rolling track and one of the bearing guiding the movement of this pendulum body, and the normal contact between another first raceway and the other of the rolling members guiding the movement of this pendulum body intersect on the axis of rotation of the support.

This also applies to combined movements between 90% and 110%, preferably between 95% and 105%.

As a variant, the shape of the aforementioned first and second tracks can be such that each pendulum body is only displaced relative to the support in translation around a fictitious axis parallel to the axis of rotation of the support.

The support may include a plurality of windows in each of which two rolling members are received.

As a variant, each window provided in the support receives only one rolling member.

According to a first example of implementation of the invention, the support is unique and each pendulum body comprises:

a first and a second pendulum mass spaced axially from one another, the first pendulum mass being arranged axially on a first side of the support and the second pendulum mass being axially disposed on a second side of the support, and

- At least one connecting member of the first and second pendulum mass, matching said masses.

As a variant, each pendulum body comprises two connecting members matching the first and the second pendulum mass, each connecting member defining a second rolling track cooperating respectively with one of the two rolling members guiding the movement of this pendulum body relative to support. Each rolling member cooperates here with a single second rolling track. A portion of the contour of this connecting member, for example a part of the radially outer surface of this connecting member, for example defines this track which is integral with the pendular body. In this case, part of the outline of the window in which this connecting member is arranged then defines the running track secured to the support with which the rolling member cooperates to guide the movement relative to the support of this pendulum body.

Such a connecting member is for example force fitted via each of its axial ends in an opening formed in one of the pendulum masses. Alternatively, the connecting member can be welded via its axial ends to each pendulum mass. The connecting member can also be screwed or riveted to each pendulum mass.

The axial shoe can be riveted to the pendulum mass. A single riveting operation can link the shoe, the link and the pendulum mass together.

According to this exemplary implementation of the invention, each rolling member can then only be subjected to compression between the first rolling track secured to the support and the second rolling track secured to the pendulum body as mentioned above. These rolling tracks cooperating with the same rolling member can be at least partially radially opposite, that is to say that there are planes perpendicular to the axis of rotation in which these rolling tracks extend. both.

According to a second example of implementation of the invention, the device comprises two separate supports offset axially and integral, each pendulum body comprising at least one pendulum mass disposed axially between the two supports.

The pendulum mass of a pendulum body is then sandwiched axially between the two supports. The two supports are for example secured via a connection such as a rivet positioned radially inwardly relative to the pendulum bodies. Two hoods can then be positioned axially around the assembly formed by the two supports and the pendulum bodies. We can thus successively find axially:

- one of the covers,

- one of the supports,

- pendulum mass,

- the other support, and

- the other of the covers.

In all of the above, the device for damping torsional oscillations can be configured so that the displacement of the pendulum bodies makes it possible to filter the order of excitation of the heat engine of the vehicle in which the device is integrated, internal combustion engine having in particular two cylinders or three cylinders.

In all of the above, each support can be made in one piece, for example being entirely metallic.

In all of the above, the device may include at least one interposing piece, at least part of which is axially disposed between a support and a pendulum mass of the pendulum body. Such an interposition piece can thus limit the axial displacement of the pendulum body relative to the support, thus avoiding axial shocks between said pieces, and thus unwanted wear and noises, in particular when the support and / or the pendulum mass are made of metal. Several interposing pieces, for example in the form of skates, can be provided. The interposing pieces are in particular made of a damping material, such as plastic or rubber.

The interposing pieces are for example carried by the pendulum bodies. The interposing pieces can be positioned on a pendulum body so that there is always at least one interposing piece, at least part of which is axially interposed between a pendular mass and the support, whatever the positions. relative of the support and said mass when moving relative to the support of the pendulum body.

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 clutch disc, comprising a torsional oscillation damping device as defined above.

The support of the torsional oscillation damping device can then be one of:

- a veil of the component,

- a component guide washer,

- a component phasing washer, or

- A support separate from said web, from said guide washer and from said phasing washer.

Another subject of the invention, according to another of its aspects, is a vehicle powertrain comprising:

a vehicle propulsion engine, in particular with two, three or four cylinders, and

- a component for the transmission system as defined above.

The invention will be better understood on reading the description which follows of nonlimiting examples of implementation thereof and on examining the appended drawing in which:

FIG. 1 is a front view of a device for damping torsional oscillations according to the invention, the pendulum bodies being in the rest position,

FIG. 2 is a front view of the device in FIG. 1, the elements being artificially visible in transparency, the pendulum bodies being in the rest position,

FIG. 3 is a front view of the device in FIG. 1, the elements being artificially visible in transparency, the pendulum bodies being in the position of maximum clearance,

- Figure 4 is a front view of the device for damping torsional oscillations according to the invention, showing an alternative of the male part of the joint, the pendular bodies being in the rest position, one of the bodies pendulum being out of sync with the other three pendulum bodies

- Figure 5 is a front view of the device of Figure 4, the elements being artificially visible in transparency, one of the pendulum bodies being out of synchronization with the other three pendulum bodies,

FIG. 6 is a front view of the device for damping torsional oscillations according to the invention, with pads,

FIG. 7 is an exploded view of the device of FIG. 6,

FIG. 8 is a perspective view of one of the pads of the device in FIG. 6,

FIG. 9 is a front view of the device for damping torsional oscillations according to the invention, representing an alternative of the articulation, the first pendular masses being in transparency, and

- Figure 10 is a perspective view of the device of Figure 9.

FIG. 1 shows a device 1 for damping torsional oscillations according to the invention.

The device 1 for damping torsional oscillations is of the pendulum oscillator type. The device 1 is in particular able to equip a motor vehicle transmission system, being for example integrated into a component not shown of such a transmission system, this component being for example a double damping flywheel, a hydrodynamic torque converter or a Clutch disc.

This component can be part of a powertrain of a motor vehicle, this group comprising a heat engine in particular with two, three or four cylinders.

In FIG. 1, the device 1 is at rest, that is to say that it does not filter the torsional oscillations transmitted by the propulsion chain due to the acyclisms of the heat engine.

In known manner, such a component may comprise a torsion damper having at least one input element, at least one output element, and elastic return members with circumferential action which are interposed between said input and output elements . Within the meaning of the present application, the terms “entry” and “exit” are defined with respect to the direction of transmission of the torque from the heat engine of the vehicle to the wheels of the latter.

The device 1 comprises in the example considered:

a support 2 able to move in rotation around an axis X, and

- A plurality of pendular bodies 3 movable relative to the support 2.

Support 2 can be unique. The pendulum bodies 3 can be distributed equiangularly around the periphery of the axis X of rotation.

The support 2 of the damping device 1 can consist of:

- an input element of the torsion damper,

- an output element or an intermediate phasing element disposed between two sets of shock absorber springs,

an element linked in rotation 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. The support can also be other, for example a flange of the component.

In the example considered, the support 2 generally has the shape of a ring comprising two opposite sides 4 which are here flat faces.

As can be seen in particular in the figures, each pendulum body 3 can include:

- two pendulum masses 5, each pendulum mass 5 extending axially opposite one side 4 of the support 2, and

- two connecting members 6 joining the two pendulum masses 5.

Alternatively, each pendulum body 3 may comprise a single connecting member 6 joining the two pendulum masses 5.

The connecting members 6, also called "spacers", can be angularly offset. Each pendulum body 3 extends angularly between two circumferential ends, which correspond respectively to the circumferential ends 7 and 8 of the pendulum masses 5 of this pendulum body 3.

The pendulum masses 5 may each include an internal face 5a and an external face 5b, opposite the internal face 5a. The internal 5a and external 5b faces can be flat. The internal face 5a can face the support 2.

In the examples of Figures 1 to 6, each end of a connecting member 6 is force fitted into an opening in one of the pendulum masses 5 of the pendulum body 3, so as to secure these two pendulum masses 5 together.

In the example of Figures 7 to 9, each connecting member 6 is riveted to at least one of the pendulum masses 5 via rivets 9 (visible in Figure 8) so as to secure the latter to each other.

In yet another alternative, each end of a connecting member 6 is secured to one of the pendular masses 5 by welding.

The device 1 further comprises rolling members 11 guiding the movement of the pendulum bodies 3 relative to the support 2. The rolling members 11 are here rollers.

In the example described, the movement relative to the support 2 of each pendulum body 3 is guided by two rolling members 11. This movement is for example a combined movement.

Each rolling member 11 is received in a window 19 made in the support 2. The same window 19 made in the support 2 is adapted to receive a single rolling member 11.

Each window 19 has a closed contour and part of this contour can define a first rolling track 12 secured to the support 2, on which one of the rolling members 11 received in this window 19 will roll.

Alternatively, the same window 19 is adapted to receive two rolling members

11. Each window 19 has a closed contour and two parts of this contour can define two first rolling tracks 12 secured to the support 2, on which two rolling members 11 are respectively received for rolling.

The rolling members 11 are non-through.

Alternatively, the rolling members 11 are through. At least one window is provided on at least one pendulum mass 5, said at least one window being adapted to receive at least a portion of at least one rolling member 11.

Each connecting member 6 can define a second rolling track 13 which is integral with the pendulum body 3 to which this connecting member 6 belongs and on which one of the rolling members 11 rolls to guide the movement of this pendulum body 3 relative to the support. 2.

Each connecting member 6 may have on its radially inner edge at least one notch 17 in which a stop damping member 18 is received. The abutment damping members 18 are for example made of elastomer or rubber. These abutment damping members 18 absorb the shocks between the pendulum body 3 and the support 2 in the event of a radial fall during a stopping of the vehicle engine and / or after a deflection of this pendulum body 3 to filter out a torsional oscillation.

Each connecting member 6 can be received in one of the windows 19 made in the support 2. The same window 19 is adapted to receive a single connecting member 6. The same window 19 is adapted to receive two connecting members 6.

According to the invention, each of the pendulum bodies 3 of the device 1 is circumferentially interposed with at least one first pendulum body 3 which is adjacent to it, and forms with this first adjacent pendulum body a group of at least two circumferentially consecutive pendulum bodies, called hereinafter, respectively, intercalated pendulum body 3a, first adjacent pendulum body 3b.

In addition according to the invention, each of the pendulum bodies 3 of the device 1 is circumferentially interposed between the first adjacent pendulum body 3b and a second pendulum body 3 which is also adjacent to it, and forms with these two adjacent pendulum bodies a group of three bodies. circumferentially consecutive pendulars, hereinafter called respectively the intercalated pendulum body 3a, the first adjacent pendulum body 3b, and the second adjacent pendulum body 3c.

It will be understood that each pendulum body of the device is a pendulum body 3 interposed between a pendulum body or two other pendulum bodies 3, but can also be considered as a "first adjacent pendulum body" or a "second adjacent pendulum body", as desired. which is made of the set of two or three pendulum bodies 3 consecutive (and therefore of the pendulum body 3 said intercalated).

Each intercalated pendulum body 3 a can be dimensioned so that its circumferential ends 7 and 8, respectively, are always at a distance from one of the circumferential ends 7, 8 of the adjacent pendulum bodies 3b, 3c, respectively.

Each intercalated pendulum body 3a is articulated, at at least one of its circumferential ends 7, 8, respectively, on at least one of the first and second adjacent pendulum bodies 3b, 3c. The device 1 comprises at least one articulation 20. The at least one articulation 20 is shaped so as to allow rotation of the pendulum body inserted 3a only in a plane transverse to the axis X of rotation of the support 2. L ' at least one articulation 20 has a male part 21 and a female part 22.

Preferably, each interleaved pendulum body 3a is articulated, at its two circumferential ends 7, 8, respectively, for example on the first and second adjacent pendulum bodies 3b, 3c. The intercalated pendulum body 3a can be articulated by two articulations 20.

The articulation 20 is adapted to limit the displacement of the intercalated pendulum body 3a relative to the support 2. The articulation 20 is further adapted to synchronize the displacement of the intercalated pendulum body 3a with respect to the displacement of at least one of the first and second adjacent pendulum bodies 2b, 2c. The articulation 20 has a double function.

The male part 21 and / or the female part 22 of a joint 20 (which each belong to a respective pendulum body 3) may have come integrally with a pendulum mass 5 of a respective pendulum body 3. They can also be constituted by parts fixed on the pendular masses 5. In particular, the male part 21 can extend between a fixing portion 23 and a free end 24. The fixing portion 23 can be integral with one of the masses respective pendulars 5 and more particularly with one of the circumferential ends 7, 8 of one of the respective pendular masses 5. The female part 22 can be formed on the other of the circumferential ends 7, 8 of a pendulum mass 5 circumferentially adjacent.

Thus, the articulation can be directly carried by two pendulum masses 5 of two pendulum bodies 3 circumferentially neighboring.

Alternatively, the male part 21 and / or the female part 22 of a joint 20 (which each belong to a respective pendulum body 3) may have come in one piece with a connecting member 6 of a respective pendulum body 3. They can also be constituted by parts fixed on the connecting members 6. The fixing portion 23 of the male part 21 can be integral with one of the circumferential edges 6a, 6b of one of the respective connecting members 6 (see for example Figure 9). The female part 22 can be formed on the other of the circumferential edges 6a, 6b of a circumferentially adjacent connecting member 6.

Thus, the joint can be directly carried by two connecting members 6 of two pendulum bodies 3 circumferentially neighboring.

Alternatively, the intercalated pendulum body 3a can comprise a shoe 30. The shoe 30 can extend circumferentially between a first end edge 31 and a second end edge 32. The shoe 30 can include an internal face 33 and an external face 34 , opposite the internal face 33. The internal face 33 can be located opposite one of the pendular masses 5 of a pendular body 3. More particularly, the internal face 33 can be located opposite the external face 5b of one of the pendulum masses 5 of a pendulum body 3. The shoe 30 can be secured to said pendulum mass 5 by riveting. More particularly, the rivets 9 of the connecting members 6 can be adapted to fix said shoe 30 to the pendulum masses 5 of the pendulum body 3. The male part 21 and / or the female part 22 of the articulation 20 may have come in one piece with a shoe 30 of a pendulum mass 5 of a respective pendulum body 3. They can also be constituted by parts fixed on the pads 30. In particular, the fixing portion 23 of the male part 21 can be integral with one of the respective pads 30 and more particularly with one of the first or second end edges 31 , 32 from one of the respective pads 30. The female part 22 can be formed on the other of the first or second end edges 31, 32 of a circumferentially adjacent shoe 30.

The device 1 can comprise a plurality of pads 30.

A single shoe 30 can be secured to two pendulum bodies which are circumferentially neighboring, preferably when the number of pendulum bodies 3 of the device 1 is even.

The female part 22 of the articulation 20 can comprise an inner edge 25. The female part 22 can form a notch in a pendular body 3. The male part 21 can be movable inside the space delimited by this notch. The inner edge 25 can at least partially delimit the contours of the notch. In order to facilitate the role of the joint 20, the inner edge 25 may have a slope of 0% +/- 10%.

The free end 24 of the male part 21 can have the shape of a hook or a hinge finger. The free end 24 may have an at least partially circular shape. The free end 24 may include an interior face and an exterior face, opposite the interior face. The inner face of the free end 24 of the male part 21 can be adapted to rub. More particularly, the internal face of the free end 24 can be adapted to rub against one of the opposite sides 4 of the support 2. Alternatively, the internal face of the free end 24 can be adapted to rub against the external face 5b of a pendulum mass 5. It is this friction, also called hysteresis, which allows the joint 20 to limit the movement of the pendulum bodies 3 and therefore to limit the noise of the device 1.

The maximum radial distance from the male part 21 is less than the maximum radial distance from the female part 22.

When all the pendulum bodies 3 of the device 1 are synchronized, the male part 21 is at a distance from the female part 22 of the articulation 20. More particularly, the free end 24 of the male part 21 is at a distance from the inner edge 25 of the female part. The male part 21 slides in the female part 22 without coming into contact with the latter.

The pendulum bodies 3 of the torsional oscillation damping device 1 are independent of each other in their synchronization. When at least one of the pendulum bodies 3 of the device 1, for example the interposed pendulum body 3a, is out of synchronization with the other pendulum bodies 3 of the device 1, for example with respect to the first and / or the adjacent second pendulum body 3b, 3c , the male part 21 comes into contact with the female part 22 of the articulation 20. More particularly, the free end 24 of the male part 21 comes into contact with the inner edge 25 of the female part. The male part 21 can be in sliding contact with the inner edge 25 of the female part 22. This contact between the male 21 and female 22 parts of the joint retains the intercalated pendulum body 3a, that is to say that it makes it possible to stop the desynchronization of the intercalated pendulum body 3a. This contact also makes it possible to resynchronize the desynchronized pendulum body, for example the interleaved pendulum body 2a, with the pendulum bodies 3 which are circumferentially adjacent thereto, for example the first and / or the second adjacent pendulum body 3b, 3c.

The device 1 can comprise a plurality of articulations 20, so that for each interleaved pendulum body 3a:

a connection via a first articulation 20 exists with the first adjacent pendular body 3b, which is circumferentially neighboring in the trigonometric direction, and

- A connection via a second articulation 20 exists with the second adjacent pendular body 3c, which is circumferentially neighboring in the non-trigonometric direction.

Each pendulum body 3 of the device 1 can also comprise at least one interposing piece 40. The at least one interposing piece 40 can be at least partially axially disposed between the pendular mass 5 and the support 2. Such a piece interposition 40 can thus limit the axial displacement of the pendulum body 3 relative to the support 2, thus avoiding axial shocks between said parts, and thus unwanted wear and noises, especially when the support 2 and / or the pendulum mass 5 are made of metal. Several interposing pieces 40, for example in the form of pads, can be provided. The interposing pieces 40 are in particular made of a damping material, such as plastic or rubber. The interposing pieces 40 are for example carried by the pendulum masses 5.

It is understood that the interposed pendulum body 3a is disposed between a first adjacent pendulum body 3b and a second adjacent pendulum body 3c. On the other hand, the first adjacent pendulum body 3b can also be an interposed pendulum body 3a when another set of pendulum bodies 3 is taken as a reference. The names: intercalated pendulum body, first and second adjacent pendulum bodies therefore relate to the choice of any set of three circumferentially consecutive pendulum bodies, and are not absolute.

The invention is not limited to the examples which have just been described.

More generally, a person skilled in the art may, without departing from the scope of the invention, implement this invention according to different embodiments or variants compatible with the invention. It may also use any suitable characteristic known from the state of the art.

Claims (10)

1. Device (1) for damping torsional oscillations, in particular intended to be integrated in a transmission chain of a motor vehicle, comprising: - at least one support (2) movable in rotation about an axis (X), - A plurality of pendulum bodies (3, 3a, 3b, 3c) mounted mobile on the support (2), each of the pendulum bodies being circumferentially adjacent to at least one other pendulum body (3, 3a, 3b, 3c) in order to forming at least one assembly of at least two circumferentially consecutive pendulum bodies, said at least one assembly comprising a first adjacent pendulum body (3b) and an interposed pendulum body (3a) circumferentially adjoining the first adjacent pendulum body, in which the pendulum body interposed (3a) is guided in oscillation on the support by at least one rolling member (11) and by at least one articulation (20) with the first adjacent pendular body (3b), said at least one articulation (20) being disposed so as to limit the movement of said intercalated pendulum body (3a) relative to the first adjacent pendulum body (3b) and to synchronize said movement with respect to the movement of said first body pe adjacent ndular (3b). 2. Device (1) according to claim 1, wherein said at least one articulation (20) comprises a male part (21) and a female part (22), the male part being adapted for, during a desynchronization of the movement of the intercalated pendulum body (3a) with the displacement of the first adjacent pendulum body (3b), coming into sliding contact with the female part in order to resynchronize said intercalated pendulum body. 3. Device (1) according to claim 2, wherein the male part (21) of the at least one articulation (20) is adapted for, during a rotation of the support (2), rub against said support or against the first adjacent pendulum body (3b). 4. Device (1) according to claim 2 or claim 3, wherein the male part (21) is spaced from an inner edge (25) of the female part (22) when the displacement of the pendulum body interposed (3a ) is synchronized with the movement of the first adjacent pendulum body (3b). 5. Device (1) according to any one of claims 2 to 4, in which the interleaved pendulum body (3a) further comprises an axial shoe (30), said shoe extending circumferentially between a first end edge ( 31) and a second end edge (32), the first end edge comprising the male part (21) of a first articulation (20) and the second end edge (32) comprising the female part (22 ) a second joint. 6. Device (1) according to the preceding claim, wherein the intercalated pendulum body (3a) comprises at least one pendulum mass (5) having an external face (5b) and an internal face (5a), opposite, the internal face being located opposite the support (2) and the external face being situated opposite the shoe (30). 7. Device (1) according to any one of the preceding claims, in which the assembly further comprises a second adjacent pendulum body (3c), the interposed pendulum body (3a) being inserted circumferentially between the first adjacent pendulum body and the second adjacent pendulum body, the intercalated pendulum body (3a) being guided in oscillation on the support (2) by a first articulation (20) with the first adjacent pendulum body (3b) and by a second articulation with the second adjacent pendulum body (3c). 8. Device (1) according to the preceding claim, wherein the articulations of the various pendulum bodies interposed (3a) are independent of each other. 9. Device (1) according to any one of the preceding claims, in which the movement of each interleaved pendulum body (3a) relative to the support (2) is guided by at least two rolling members (11), each member of bearing (11) cooperating with a first raceway (12) secured to the support (2) and with a second raceway secured (13) to the intercalated pendulum body (3a). 10. 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 clutch disc, comprising a device (1) according to any one of the preceding claims .