FR3000161A1 - Vibration absorbing device for use in transmission device such as friction clutch, of car, has counterweight contained in virtual enclosure, where counterweight rests on set of contours of window, and projects axially from mounting - Google Patents

Abstract

The device (5) has a mounting (10) defining two radially external supporting raceways and a radially internal supporting raceway (37). A counterweight defines a radially internal counterweight raceway and two radially external counterweight raceways. A window passes through the mounting. The counterweight is contained in a virtual enclosure having prismatic axis parallel to X-axis regardless of its position. The counterweight rests on a set of contours (26) of the window, and projects axially from the mounting.

Description

TECHNICAL FIELD The present invention relates to a vibration absorbing device for the transmission of a motor vehicle. STATE OF THE ART In a motor vehicle transmission, in order to filter the vibrations due to the acyclisms caused by the explosions in the engine cylinders, a damping device is conventionally used, associated with a clutch that selectively connects the engine to the gearbox. speeds. This clutch can be a friction clutch for a motor vehicle with a manual transmission, or be arranged in a hydrokinetic coupling device for an automatic transmission vehicle as a locking clutch. With this damping device, generally in the form of a one-piece flywheel, a flexible flywheel, or a vibration absorption device, the effect of the engine vibrations which would otherwise be transmitted through the gearbox and cause shocks, noises or noise particularly undesirable for the occupants of the motor vehicle. The search for obtaining an ever more efficient filtration led to integrate a pendulum oscillator vibration absorption devices.

In particular, pendulum oscillators are known in the prior art, including flyweights capable of oscillating in a plane orthogonal to the transmission axis, their masses, their geometries and their movements being adapted to filter ranges of the vibratory spectrum of the engine which a conventional vibration absorbing device can not filter on its own.

However, a trend in the automotive market is to reduce the number of engine cylinders while maintaining or increasing the power developed by the engine. The power developed by each cylinder is thus increased, which amplifies the motor acyclisms and generates a vibratory spectrum that the aforementioned damping devices filter with difficulty.

It also results in nuisances, especially noise, particularly undesirable. In addition, the damping devices for motor vehicle transmissions have a limited space between the engine and the transmission elements, especially in small displacement vehicles intended for urban use. There is therefore a need for more and more compact damping devices. WO 2011/147632 discloses a vibration absorption device protected by a housing. The costs to manufacture and mount such a device are high. There is therefore a need for a vibration absorbing device to respond, at least partially, to the aforementioned problems. SUMMARY OF THE INVENTION The invention proposes a vibration absorption device, intended for a motor vehicle transmission, having an axis X of rotation and comprising: a support defining two radially outer support bearing tracks and a tracking track; radially inner bearing bearing, - a flyweight defining a radially inner flywheel bearing track and two radially outer flywheel bearing tracks, - two outer running bodies mounted so as to be able to roll and / or slide on at least one of the tracks a radially outer bearing bearing and a counterweight and an inner rolling body mounted so as to be able to roll and / or slide on at least one of the radially inner bearing and bearing tracks, so that the counterweight can freely oscillate on the support. According to a first aspect, this vibration absorption device is remarkable in that the inner rolling body and / or the support and / or the weight comprises (s) a stop shaped to limit the axial displacement of the inner rolling body by relative to the support and / or the weight. Advantageously, such a vibration absorption device allows an oscillation of the flyweight with limited axial movement. The engine vibration filtering is thus improved, the inventors having observed, in particular for a motor developing a power per high cylinder and under certain operating conditions of the engine, that the axial movement of the flyweight can alter the quality of the filtering of the vibrations. of the motor.

A vibration absorbing device according to the first aspect of the invention may in particular still comprise one or more of the following additional characteristics, according to all the possible combinations: said abutment is defined by a flange disposed on the inner rolling body; and / or by a wall defined or carried by the support or by the weight, said wall extending preferably radially. A wall is said to be "supported" by the support when it is defined by a part fixed on the support, for example an assembly flange. - The inner rolling body, preferably each of the rolling bodies, comprises an annular groove receiving the support and the flyweight, said annular groove being shaped to prevent escape of said support and said flyweight out of said annular groove when the oscillation of the weight. - The inner rolling body has the shape of a cylindrical roller and said stop is defined by a defined wall or carried by the support or by the weight. - The vibration absorbing device comprises first and second said abutments shaped to limit, in both directions, the axial displacement of the inner rolling body relative to the support and / or the weight. - The inner rolling body consists of at least two assembled parts. - At least one outer rolling body and / or the support and / or the weight comprises (nt) first and second abutments shaped to limit, in both directions, the axial displacement of the outer rolling body relative to the support and / or the weight. - The stop or stops are shaped so that the maximum axial displacement of the bearing body considered, relative to the support and / or the weight, is greater than 5%, greater than 7% and / or less than 20%, less than 15%, or less than 12% of the thickness of the support, preferably about 10% of the support thickness. - The vibration absorbing device comprises at least a first mounting flange carried by the support and defining a said stop. - The support comprises a window defining said raceways, the first assembly flange defining, with said window and a second assembly flange carried by said support, a casing encapsulating the flyweight. - The radially inner bearing raceway is, starting from one end to the other end, concave, then convex, then concave again, and / or the radially outer support bearing tracks are concave. - The rolling bodies do not axially protruding from the weight and / or support and / or optional mounting flanges attached to said support.

According to a second aspect, this vibration absorption device is remarkable in that an outer rolling body and / or the support and / or the weight comprises (s) a stop shaped to limit the axial displacement of said outer rolling body relative to the support and / or the weight. As for such a vibration absorbing device according to the first aspect of the invention, a vibration absorption device according to the second aspect of the invention allows an oscillation of the weight with a limited axial displacement, but thanks to a limitation of the axial displacement of the outer race or bodies. A vibration absorption device according to the second aspect of the invention may in particular still comprise one or more of the following additional characteristics, according to all the possible combinations: Each of the outer rolling bodies comprises a stop shaped to limit the axial displacement. of said outer rolling body relative to the support and / or the weight. Said abutment is defined by a flange disposed on said outer rolling body, and / or being defined by a wall defined or carried by the support or by the weight, said wall extending preferably radially. - Said outer rolling body, preferably each of the rolling bodies, comprises an annular groove receiving the support and the weight, said annular groove being shaped to prevent escape of said support and said weight out of said annular groove when the oscillation of the weight, or said outer rolling body in the form of a cylindrical roller and said stop being defined by a defined wall or carried by the support or by the weight. - At least one outer rolling body and / or the support and / or the weight comprises first and second abutments shaped to limit, in both directions, the axial displacement of the outer rolling body relative to the support and / or the flyweight. - The stop or stops are shaped so that the maximum axial displacement of the bearing body considered, relative to the support and / or the weight, is greater than 5%, greater than 7% and / or less than 20%, less than 15%, or less than 12% of the thickness of the support, preferably about 10% of the support thickness. - The vibration absorbing device comprises at least a first mounting flange carried by the support and defining a said stop. - The support comprising a window defining said raceways, the first assembly flange defining, with said window and a second assembly flange carried by said support, an envelope encapsulating the weight. - The radially inner bearing raceway is, starting from one end to the other end, concave, then convex, then concave again, and / or the radially outer support bearing tracks being concave. - The rolling bodies do not axially protruding from the weight and / or support and / or optional mounting flanges attached to said support. According to a third aspect, this vibration absorbing device further comprises a first assembly flange, and is remarkable in that said first assembly flange is fixed on the support so as to sandwich a support protection serving. to limit the oscillation amplitude of the weight relative to the support. A vibration absorbing device according to the third aspect of the invention advantageously allows a fast and reliable attachment of the support protection on the support.

A vibration absorption device according to the third aspect of the invention may in particular still comprise one or more of the following additional characteristics, according to all the possible combinations: the inner rolling body and / or an outer rolling body and / or the two outer rolling bodies do not protrude axially (that is to say along the X axis) of said first assembly flange. - The vibration absorbing device further comprises a second flange assembly, the support having a window defining said raceways, said first and second flanges assembly defining, with said window, an envelope encapsulating the flyweight. - Said support protection overlaps an edge of said window and extends partially or pinch between the support and the first flange, and between the support and the second flange. - Said support protection comprises a pin housed in a hole in said first flange. Said support protection is made of a polymeric material. - Said first assembly flange defines a support abutment shaped to limit the axial displacement of a rolling body relative to the support. - Said outer rolling body having the shape of a cylindrical roller. - At least one of the rolling bodies, preferably each of the rolling bodies, comprises an annular groove receiving the support and the weight, said annular groove being shaped to prevent escape of said support and said weight out of said annular groove when the oscillation of the weight. According to a fourth aspect, this vibration absorption device is remarkable in that the support comprises a window passing through the support according to its thickness, the weight being, whatever its position, contained in the virtual envelope of prismatic axis Y , parallel to the axis X, based on the contour of the window, and protruding from the support axially. The shape of windows can be advantageously adapted to the geometry and mass of the weights, to modify the damping properties while maintaining an identical size.

The windows preferably have a shape substantially complementary to the weight. This shape is adapted to allow the oscillation of the feeder while conferring a sufficient width for holding in centrifugation and torque transmission. A vibration absorption device according to the fourth aspect of the invention may in particular still comprise one or more of the following additional characteristics, according to all the possible combinations: the flyweight protrudes axially on either side of the window. - The thickness of the weight and / or a rolling body is less than or equal to the thickness of the support or the total thickness of the support and assembly flanges optionally attached to the support. - None of the rolling body is axially protruding from the weight and / or support and / or optional flanges of assembly attached to said support. - The vibration absorbing device comprises first and second assembly flanges, the support comprising a window defining said raceways, said first and second assembly flanges defining, with said window, an envelope encapsulating the flyweight and / or the rolling bodies. - Said first assembly flange defines a support abutment shaped to limit the axial displacement of a rolling body relative to the support. The vibration absorption device comprises a support protection serving to limit the amplitude of oscillation of the weight relative to the support, said support protection being sandwiched between the support on the one hand and said first end plate; assembly and / or said second flange assembly on the other hand. - At least one of the rolling bodies, preferably each of the rolling bodies, comprises an annular groove receiving the support and the weight, said annular groove being shaped to prevent escape of said support and said weight out of said annular groove when the oscillation of the weight. According to a fifth aspect, this vibration absorption device comprises a first protective flange, fixed to the support and superimposed on a first large face of the weight, and optionally inner and / or outer rolling bodies, so as to (protect them.

Advantageously, this protection increases the service life of the vibration absorption device, by limiting the physical interactions between the weight, or even the rolling bodies, and the outside.

A vibration absorption device according to the fifth aspect of the invention may in particular still comprise one or more of the following additional characteristics, according to all the possible combinations: the vibration absorption device comprises a second protective flange superimposed to a second big face of the weight. - The support comprising a window defining said raceway, said first and second assembly flanges defining, with said window, an envelope encapsulating the weight and / or the rolling bodies. Advantageously, the damage that can generate the breakage of a part of a pendulum oscillator are confined to the envelope in which the rupture has occurred and do not affect the oscillation of the other pendular oscillators. - The first and / or the second protective flange define a support abutment limiting the axial displacement of a rolling body relative to the support. - At least one of the rolling body comprises an annular groove receiving the support and the weight, said annular groove being shaped to prevent escape of said support and said weight out of said annular groove during the oscillation of the weight. Each of the rolling bodies comprises an annular groove receiving the support and the flyweight, said annular groove being shaped to prevent any escape of said support and said weight from said annular groove during the oscillation of the flyweight. - The flyweight and / or a rolling body does not protrude axially from the support and / or the first protective flange and / or the second protective flange. The vibration absorption device comprises a support protection serving to limit the amplitude of oscillation of the weight relative to the support, said support protection being sandwiched between the support on the one hand and said first end plate; assembly and / or said second protective flange on the other hand.

The support comprises a window traversing the support according to its thickness, the flyweight being contained in the virtual envelope of prismatic axis Y, parallel to the axis X, based on the contour of the window, whatever the position of said weight.

According to a sixth aspect, the support has the form of a plate of thickness "e", the thickness of the vibration absorption device (measured in the direction of the thickness of said plate, that is to say axially), being less than or equal to 5.0 * e, less than or equal to 3.0 * e, less than or equal to 2.0 * e, less than or equal to 1.5 * e, preferably less than or equal to at 1.3 * e, preferably less than or equal to 1.1 * e, preferably substantially equal to e. The axial size of the device is therefore advantageously very small. The thickness "e" may be for example less than 20 mm, less than 15 mm, less than 10 mm, or even less than 5 mm.

Preferably, no rolling body protrudes axially from any one of the two large faces of said plate and / or the weight, by a distance greater than 0.2 * e, preferably greater than 0.1. * e, preferably greater than 0.05 * e. Preferably no rolling body projects axially from any one of the two large faces of said plate and / or the weight.

Preferably, the weight does not protrude axially, from any one of the two large faces of said plate, by a distance greater than 0.2 * e, preferably greater than 0.1 * e, preferably greater than 0.05 * e. Preferably the flyweight does not protrude axially from any of the two large faces of said plate. An oscillator constituted by such flyweights and rolling bodies is therefore very thin.

Advantageously, it can thus be easily integrated into any rotating flat part of a transmission of the state of the art, serving as a support. It is enough to provide suitable windows. Advantageously, this integration does not lead to substantially increasing the axial size of the transmission of the state of the art.

Preferably, no part of the vibration absorbing device other than the flyweight and the rolling bodies protrudes axially from any of the two large faces of said plate.

Preferably, the vibration absorption device comprises a support protection arranged to damp the impact of the weight on the support during its oscillation. Preferably, the support protector does not protrude axially (preferably none of the support protectors protrudes axially) from any one of the two large faces of said plate by a distance greater than 0.2 * e. preferably greater than 0.1 * e, preferably greater than 0.05 * e. Preferably the support protector does not project axially from any of the two large faces of said plate. In one embodiment, at least one or all of the rolling bodies have the shape of a coil comprising a cylindrical roller provided at each of its ends with a flange. Preferably, one or more local reductions in the thickness of the support are provided locally in the support and / or in the feeder, in particular in the areas likely to be in contact with the collars during the oscillation of the feeder, to adapt the support and / or the weight to the rolling bodies and preferably limit or even eliminate the axial projection of the rolling bodies relative to the support and / or the weight, respectively. In one embodiment, at least one or all of the rolling bodies have the shape of a cylindrical roller disposed in a housing of the weight and / or in a housing of the support. These housings are shaped to receive the rolling body by allowing its rolling and may in particular have the form of hemicylindrical recesses. The invention also relates to a transmission device of a motor vehicle selected from a friction clutch and a hydrokinetic converter, said device comprising a vibration absorbing device according to the invention. The invention finally relates to a motor vehicle equipped with a transmission device according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood on reading the detailed description which follows and on examining the appended drawing, in which: FIG. 1 represents a vibration absorption device according to a first embodiment of FIG. Embodiment of the invention; FIG. 2 shows, in an enlarged view, a partial view of a pendulum oscillator in its oscillation movement; FIG. 3 is an exploded and partial view of the support of the inner rolling bodies; and outer and feeder according to a first embodiment of the invention, - Figure 4 shows a partial axial view of a vibration absorbing device according to a variant of the first embodiment of the invention and two views. in section of an oscillating element and the support of a vibration absorption device according to this first embodiment, - Figure 5 illustrates a vibration absorption device according to a varia In the first embodiment, having assembly flanges and support protectors, FIG. 6 shows an axial view and a sectional view of a vibration absorbing device according to the embodiment of FIG. 5. FIG. 7 illustrates a vibration absorption device according to a second embodiment of the invention, FIG. 8 represents an axial view and a sectional view of a vibration absorption device according to the method of FIG. FIG. 9 shows an exploded view of the constituent elements of the vibration absorption device according to a variant of the second embodiment, FIG. 10 represents an axial view and a sectional view of a device. vibration absorption device according to the embodiment of Figure 9, and - Figure 11 illustrates a vibration absorbing device having first and second shielding flanges. In the different figures, identical or similar members have been identified with the same references.

Definitions By convention, the "radial" orientation is directed orthogonally to the X axis of rotation of the support of the vibration absorbing device. The X axis of rotation defines the "axial" orientation. By plane or section "axial" or "radial" is meant a plane or a section of which a normal vector is collinear with the axis X of rotation or respectively at a radial orientation. The terms "inside" and "outside" are used to define the position relative to the X axis, an internal positioning being closer to the X axis than an outside positioning. For example, an outer rolling body is located at a greater radial distance from the X axis of rotation than an inner rolling body. An object is said to be "encapsulated" by an envelope or a surface when this envelope or surface contains this object and is substantially closed (without opening towards the outside.) For the sake of clarity, an abutment is referred to as a "support abutment". or "flywheel stop" when limiting the axial displacement of a rolling body relative to the support or the weight, respectively, In the absence of particular precision, a "stop" may be a support abutment and / or Similarly, a flange is qualified as an "assembly flange" when it contributes to the attachment or the maintenance of another part and "protective flange" when it contributes to protecting a part, a flange The term "comprising a" or "comprising a" means "comprising at least one", unless otherwise indicated, and "defining a" means "defining at least one", except otherwise stated.

Detailed Description The examples illustrated by the drawing are preferred embodiments and are provided for illustrative purposes only. The invention is therefore not limited to these embodiments. FIGS. 1 to 4 show a vibration absorption device 5 according to a first embodiment. The vibration absorption device 5 comprises a support 10 on which are mounted four identical pendular oscillators, referenced 13a to 13d, mounted in windows 25 to 25d identical, respectively, passing through the support 10 in its thickness. Subsequently, reference is made generally to a pendulum oscillator 13 and to a window 25. Each oscillator oscillator 13 comprises a counterweight 16 mounted oscillating, with the aid of two outer rolling bodies 191 and 192 and a inner rolling body 22, in the window 25 (see Figure 2).

Preferably, the weight and the rolling bodies are arranged so that the oscillation takes place in a plane substantially perpendicular to the axis X of rotation of the vibration absorption device. Support The support 10 has the general shape of a rotation axis ring X, of substantially constant thickness. It has first 281 and second 282 large support faces, preferably planar. The central recess 29 thus allows, for example, the passage of a transmission shaft. The X axis of rotation of the support is then coincident with the axis of rotation of the transmission shaft.

The support also has two radially outer protuberances in the form of tabs 311 and 312, which conventionally allow the support of the support on damping springs, for example a double damping flywheel of a transmission device of a vehicle. The support comprises bores 28 for fixing, by means of rivets for example, the support to other parts of the vibration-absorbing device, for example a protective flange and / or an assembly flange described herein. -after. These bores 28 may be arranged equidistant from the axis X. Preferably, the support has the same number of weights as windows. Preferably, the windows 25 are at the same distance from the axis X of rotation and spaced equiangularly from one another about the axis X. For example, in FIG. 1, where the support comprises four windows 25, the angle between two successive windows is 90 °. Preferably, the support 10 may be constituted by any material supporting a rolling contact pressure. In particular it may be a metal alloy, preferably an aluminum alloy or steel, in particular treated steel, for example 16MnCr5 carbonitrided.

It can be obtained in particular by molding or be machined in a block. The openings (windows, bores) can result from the molding of the support, or can be obtained by cutting, drilling or any other suitable machining means. As illustrated in Figures 1 to 4, the support defines, on a radially inner portion 34 of the contour 26 of the window 25, a radially inner bearing raceway 37 having, starting from one end to the other end of the track, a first concave portion, then a convex portion, and a second concave portion. Furthermore, the support defines, on a radially outer portion 40 of the contour of the window 25, first 431 and second 432 radially outer support bearing tracks of concave shape. Preferably, the radially outer portion 40 of the contour 26 of the window 25 is opposite and faces the radially inner portion 34. Alternatively, an inner and / or outer raceway may also be carried by the bottom of a groove arranged in the contour 26. It may be flat, or may have transversely a curved profile, or a semi-circular, or a shape of groove "U", or "V", or "W", thus able to guide a rolling body having a complementary shape. A radially inner or outer bearing raceway 371 or 431-432 is delimited by the zone on which an inner or outer rolling body, respectively, moves in particular by rolling and / or sliding, during the oscillation of the flyweight. A radially inner bearing raceway 37 and a radially outer bearing raceway 431-432 may be located on opposite faces of the window and face each other. As a variant, and preferably as illustrated in FIGS. 1 to 4, they may be offset relative to one another. In particular, the radially inner bearing raceway may be midway between two radially outer bearing raceways, as shown. When the outline of a window carries a plurality of radially outer and / or respectively inner support bearing tracks 431-432, these radially outer and / or inner support bearing tracks may overlap. Preferably, the radially outer and / or inner support bearing tracks are disjoint. Bearing Body By definition, the inner rolling body 22 is located closer to the center of rotation of the vibration absorbing device 5 than the outer rolling bodies 191-192. Preferably, the angular deviations, around the X axis, between the inner raceway 22 on the one hand and the first and second two outer races 19-192 on the other hand are substantially identical. An inner rolling body 22 and / or outer 191-192 has a form of revolution. It can in particular be in the form of a cylinder, a ball, or a diabolo. In longitudinal middle section (section passing through its axis of revolution), a rolling body may for example have a flat profile or shaped "W" or V-shaped. As illustrated in particular in FIG. 2, the inner and outer bearing bodies 22 and 19-192 have a similar shape, namely the shape of a coil comprising a cylindrical roller 46 provided at each of its ends with a first one. and a second collar 492.

The diameter of the cylindrical roller 46 of an inner and / or outer bearing body is preferably less than 25 mm and / or greater than 5 mm. The flanges preferably extend substantially perpendicular to the axis of revolution of the rolling body. Each rolling body preferably has an "H" shaped cross section as shown.

More specifically, the cylindrical surfaces of the inner and outer bearing bodies 221 and 191-192 are shaped so as to be able to slide and / or roll on the radially inner bearing raceway 37, respectively on the radially outer bearing raceways 431. -432. A first lateral face 501 of the first flange 491 of an inner rolling body 22 and / or outer 191-192 defines a first abutment of the support limiting the axial displacement of the rolling body 22 relative to the support 10 in a first direction, and a second lateral face 502 of the second flange 492, opposite and facing the first lateral face, defines a second support abutment limiting the axial displacement in the opposite direction to the first.

The cylindrical surface of the cylindrical roller 46 and the first and second side faces of a rolling body define an annular groove receiving the support and, as described below, the flyweight. This groove advantageously limits the relative axial displacement of the weight relative to the support and the flyweight, while allowing pendulum oscillation. The diameters of the flanges of the inner and outer bearing bodies 221 and 191-192 are determined so as to limit the displacement. axial of the weight, relative to the support, regardless of the position of the weight 16 in its oscillation movement. These diameters are however limited, as far as possible, so that the friction of the weight and the support with the flanges 491-492 does not substantially affect the oscillation movement and does not affect the damping quality of the device. vibration absorption 5.

The diameter of a flange of an inner and / or outer rolling body is preferably less than 30 mm and / or greater than 7 mm. In one embodiment, one or more local reductions in the thickness of the support may be provided in the support to adapt the latter to the rolling bodies or limit or eliminate the axial projection of the rolling bodies relative to the support.

An inner race 22 and / or outer race 191-192 is preferably made of a metal alloy, for example steel, especially treated steel, for example 16MnCr5 carbonitrided. An inner bearing body 22 and / or outer 191-192 can be one-piece. Preferably as illustrated in particular in Figures 3 and 4, at least one of the rolling bodies, preferably at least the inner rolling body 22, consists of an assembly of several parts. These parts are preferably irreversibly assembled, preferably after positioning the feeder 16 in the window 25. A first part 521 is preferably in the form of a cylindrical roller 46 provided with a ring groove 55 close one end of the cylindrical roller and a flange 492 located at the opposite end. A second piece 522 is preferably in the form of a ring whose outer diameter is preferably identical to that of the flange of the first piece 521 and whose inner diameter allows an irreversible mounting, for example in force or by expansion in the groove 55 of the first piece.

Masselotte Preferably, the weight 16 has the general shape of an annular portion, preferably substantially flat. It may comprise first 581 and second 582 large faces, a first radially inner face 611, a second radially outer face 612 and first 641 and second 641 side faces. The weight may in particular be obtained by molding and / or machining. Preferably, it is made of a metal alloy, for example steel, especially treated steel, for example 16MnCr5 carbonitrided, or cast iron. The mass of the weight is preferably greater than 50 g and / or less than 1000 g. The thickness of the weight may be locally adapted to have a shape complementary to that of the annular groove of a rolling body (surfaces 671, 672 and 673). In one embodiment, this adaptation advantageously makes it possible to limit or even eliminate any axial projection of the rolling bodies out of the planes of the large faces of the weight. The portion of the radially outer face 612, respectively inner 611, of the flyweight 16 on which the inner rolling body 22, respectively outer 191-192 can slide and / or roll defines a radially inner flywheel bearing track 73, respectively outer 701-702. The radially outer 701-702 and / or inner 73 bearing races are preferably concave. The first lateral face 501 of the first flange 491 of the inner rolling body 22 and / or of the outer rolling bodies 191-192 defines a first thrust bearing limiting the axial displacement of the rolling body 22 with respect to the weight 16 in a groove. first direction, and the second lateral face 502 of the second opposite flange 492 defines a stopper limiting the displacement in the opposite direction to the first. As illustrated in FIGS. 1 to 4 in particular, the axial displacement of the support 10 with respect to the flyweight 16 is thus limited thanks to the stops defined by the flanges of the rolling bodies. The counterweight 16 can thus oscillate in a plane substantially common to the plane of rotation of the support 10. Supporting protections In order to dampen the impact of the oscillating oscillator 13 against the contour 76 of the window 25, first 791 and second 792 protections support members, preferably having the shape of a jumper, overlap the lateral portions 821 and 822 of the contour 76 of the window 25, and define first and second oscillation stops 80 for the weight in its oscillation movement, respectively , preferably avoiding any contact between the weight 16 and the support 10. Preferably, these support protections are made of a polymeric material, preferably a material that effectively converts the energy of the flyweight into heat, for example in a elastomer type NBR. Thus, a support protection can absorb the energy of the shock when the weight hits the support.

The shape of the weight is preferably substantially complementary to that of the support pads to maximize energy absorption when the weight hits the support. In a variant not shown, in addition or substitution of the support protections 791 and 792 attached to the support, the weight 16 can also wear support protections, for example in the form of jumpers overlapping the weight. Operation In the absence of rotation of the support, the weight 16 rests on the inner rolling body and / or on one or more of the outer rolling bodies, under the effect of gravity. During a rotation of the support around the axis X of rotation, the flyweight 16 deviates from the axis X of rotation under the effect of the centrifugal acceleration. The outer rolling bodies are then compressed between the outer support bearing tracks 431-432 and the flyweight 70. In this situation, no contact is preferably established between the inner rolling body 22 and the inner race of the inner race. support 37. The radial clearance advantageously avoids a blockage of the weight in its oscillation movement. During rotation of the support, the weight 16 is rotated about the axis X of rotation. Due to the rotational speed variations of the support, in particular vibrations and acyclisms, the flyweight can oscillate with respect to the support, in an axial plane. The outer bearing bodies 191-192 and inner 22 then guide the movement of the weight relative to the support 10, the latter being housed in the annular groove formed between the flanges of each rolling body. The outer raceways 191-192 move in an axial plane, by sliding and / or by rotation, along the radially outer bearing raceways 431-432 and / or along the radially outer raceways 701 -702.

The oscillation movement of the flyweight is for example limited by contact with a contact zone Z of the contour 76 of the window 25 in an oscillation stop position, as represented, for example, in FIG. 2. The geometries of FIG. the flyweight 16, rolling bodies 22, 191-192, and the window 25 are preferably chosen so that, for this position, no contact is established between the lateral faces 641-642 of the weight and the contour 76 of the window 25. Figure 5 illustrates a second preferred embodiment of the invention. The weight 16 is contained in the virtual envelope of prismatic axis (Y) resting on the contour 76 of the window 25, and protrudes on both sides of the window 25, preferably symmetrically relative to in the median plane of the weight 16. Furthermore, the vibration absorbing device 5 comprises first 851 and second 852 assembly flanges which enclose the support and the support protections 791 and 792.

The first 851 and second 852 assembly flanges may each be provided with a central circular opening 1151-1152, which may coincide with the central recess 29 of the support 10, and allowing for example the passage of third parts of the transmission system. The first 851 and / or the second 852 mounting flange preferably has the general shape of a ring, the inner diameter and / or outer diameter is preferably substantially equal to the inner diameter and / or outer diameter of the support, respectively. Such an assembly flange is preferably made of a metal alloy, for example steel. The first 851 and / or the second 852 assembly flange has a flat face 86f-862 intended to bear tightly on one of the large faces 281-282 of the support. The support protectors 791-792 are provided with pins 88 which penetrate or even snap into corresponding bores 91 formed in the support, and / or in the first 851 and second 852 flanges, preferably in the support. The pins 88 can thus prevent any displacement of the support protections 791-792 along the plane of the support, or even perpendicularly to this plane. Preferably, the first 851 and second 852 mounting flanges block the support protections in position on the support, the support 10 being pinched axially between the two assembly flanges. In general, the support protections can be immobilized, in the plane of the support, by complementarity of form between the support protections on the one hand and the support and / or the (s) flange (s) of assembly of on the other hand, for example with pins, and immobilized axially by clamping between the support and the (s) flange (s) assembly. Preferably, the support protections do not protrude axially from the large faces of the support, such as the support protection 791 on the section DD of FIG. 6. The support 10 can be fixed to the first 85i and / or the second flange 852 of the support. assembly by any means, for example by means of rivets 92, preferably passing through the first 85i and / or the second 852 mounting flange, and the support 10, as illustrated on the sections EE and GG of FIG. Figures 7 to 10 illustrate another alternative embodiment of the invention, in which. the outer raceways 191-192 and inner 22 each have the shape of a cylindrical roller. The weight 16 comprises, formed on its radially outer face 612, two outer housings 941-942 and, on its radially inner face, an inner housing 97. These housings are shaped to receive the outer and inner rolling bodies, respectively, allowing their bearing, as illustrated on section section EE of Figure 8. The housing can in particular be in the form of semi-cylindrical recesses. Preferably, the cylindrical roller of a rolling body has a substantially equal radius, but slightly less than the radius of the corresponding housing.

The outer housings 941-942 and inner 97 respectively define outer 701-702 and inner 701 flywheel bearing tracks, as illustrated for example in FIG. 8. The lateral faces 971 and 972 of a housing 941-942 or 97 define first and second flyweight stops 1001-1002 which limit the axial displacement of the rolling body 191-192, 22 disposed in said housing relative to the weight 16.

In a variant not shown, the housing 941-942, 97 may have the shape of a spherical cap, for example a hemispherical recess, in which a rolling body in the form of a spherical ball is housed. The ball preferably has a substantially identical (but slightly lower) radius to the radius of curvature of the spherical cap and the spherical cap defines feeder stops limiting the axial displacement of the weight 16 relative to the ball. Similarly, in an embodiment not shown, housings of substantially complementary shape to the corresponding rolling bodies may be formed in the thickness of the window 25 of the support to receive said rolling bodies, preferably by defining stops of support limiting the axial displacement of said rolling bodies relative to the support. The first and / or second flange assembly may define one or more support stops. Thus, a raceway defined by the support may not be bordered by lateral faces defined by the support, but be bordered by at least one assembly flange 851 or 852, as represented for example on the lower part of the section EE. The support abutments are then defined by portions 1031 and / or 1032 of the faces 861 and / or 862 of the first and second assembly flanges, respectively.

Portions 1031-1032 can thus participate, with the inner contour 34 or the outer contours 401-40, respectively, of the window (which carry the inner raceway 37, respectively the outer races 431-432) to the definition. a housing in which is disposed the inner rolling body 22, respectively an outer rolling body 191-192.

The cooperation of the feeder stops, defined by the recesses in the weight and the support abutments, defined by the assembly flanges, thus limit the axial displacement of the rolling bodies relative to the weight 16 and the support in both. meaning. The flyweight can thus oscillate in an axial plane, with limited movement relative to the support 10.

Similarly to the assembly flanges 851 and 852, in one embodiment not shown, one or two flanges could be carried by the flyweight to define one or more walls acting as feeder stops, preferably so as to block the displacement axial of one or more rolling bodies relative to the counterweight in both directions.

As illustrated in FIGS. 7 and 8, the first 851 and second 852 assembly flanges may have openings which are superimposed on the window 25, except possibly on the portions defining support stops 1031-1032 for the rolling bodies. To protect the weight 16, and prevent a foreign body comes between the feeder 16 and the support 10 and hinder its oscillation movement, the first 851, respectively the second assembly flange 852 may comprise a first , respectively a second protective cover, in the form of recesses 1091 and 1092, respectively, which overlap partially, preferably completely in the window 25. After assembly on the support, the first 1091 and second 1092 recesses define protective envelopes first 581 and second 582 large feeder faces, respectively. The first 1091 and second 1092 recesses and the support thus define a protective envelope 112 which encapsulates the weight 16, as illustrated in FIGS. 9 to 11. An assembly flange 851-852 can thus define a protective flange for the flyweight. 16. Preferably, the distance between the first recess 1091, respectively the second recess 1092, and the first 581, respectively the second 582 large face of the weight 16 is determined so that, during its oscillation movement, no harmful contact the effectiveness of the vibration filtering is established between the flyweight 16 and the first 85iet and / or the second 852 assembly flange. Preferably, a protective flange is obtained by stamping a plate, in particular a metal plate, so as to form one or more recesses in the protective flange. Of course, the invention is not limited to the embodiments described and shown. In particular, the same window of the support may comprise several pendular oscillators. The support may also comprise more, or on the contrary, less than four windows 25. It may also include several radially inner raceways.

In addition, all possible combinations of features relating to different aspects of the invention are contemplated.

Claims (13)

REVENDICATIONS1. Vibration absorbing device (5) for a motor vehicle transmission, having an axis X of rotation and comprising: - a support (10) defining two radially outer support bearing tracks (431, 432) and a track of radially inner bearing bearing (37), - a flyweight (16) defining a radially inner flywheel bearing track (73) and two radially outer flywheel bearing tracks (701, 702), - two outer running bodies (19i , 192) mounted so as to be able to roll and / or slide on at least one of the radially outer support bearing tracks (431, 432) and the flyweights (701, 702) and an inner bearing body (22) mounted able to roll and / or slide on at least one of the radially inner bearing tracks (37) and feeder (73), so that the weight can freely oscillate on the support, characterized in that the support comprises a window (25) passing through the support according to its thickness, the flyweight being, whatever its position, contained in the virtual envelope of prismatic axis Y, parallel to the axis X, based on the contour (26,76) of the window, and protruding from the support axially. 2. Vibration absorbing device according to the preceding claim, the weight protruding axially on either side of the window. Vibration absorbing device according to claim 1, wherein the thickness of the weight and / or of a rolling body is less than or equal to the thickness of the support or the total thickness of the support and of assembly flanges optionally attached to the support. 4. Vibration absorbing device according to any one of the preceding claims, wherein none of the rolling bodies doaxially protrudes from the weight and / or the support and / or optional connecting flanges fixed to said support. 5. Vibration absorbing device according to any one of the preceding claims, comprising first and second assembly flanges, the support comprising a window (25) defining said raceways, said first and second assembly flanges defining with said window, an envelope encapsulating the flyweight and / or the rolling bodies. 6. Vibration absorbing device according to the immediately preceding claim, wherein said first mounting flange defines a support abutment shaped to limit the axial displacement of a rolling body relative to the support. A vibration absorbing device according to any one of the two immediately preceding claims, having a support guard for limiting the oscillation amplitude of the weight relative to the support, said support protection being sandwiched between the support on the one hand and said first flange assembly and / or said second flange assembly on the other. 8. Vibration absorbing device according to any one of the preceding claims, wherein at least one of the rolling bodies, preferably each of the rolling bodies, comprises an annular groove receiving the support and the flyweight, said annular groove being shaped to prevent escape of said support and said weight out of said annular groove during the oscillation of the weight. A vibration absorbing device according to any one of the preceding claims, wherein the support is in the form of a plate of thickness "e", the thickness of the vibration absorbing device, measured in the direction the thickness of said plate, being less than or equal to 3.0 * e. Vibration absorbing device according to any one of the preceding claims, wherein the support is in the form of a plate of thickness "e", and in which no rolling body projects axially from the any one of the two large faces of said plate, a distance greater than 0.2 * e and / or wherein the weight does not project axially, from any one of the two large faces of said plate, a distance greater than 0.2 * e. 11. Vibration absorbing device according to the immediately preceding claim, wherein no rolling body projects axially from any one of the two large faces of said plate and / or in which no rolling body projects axially from the flyweight and / or wherein the flyweight does not protrude axially from any of the two large faces of said plate. 12. A transmission device of a motor vehicle selected from a friction clutch and a hydrokinetic converter, said device comprising a vibration absorbing device according to any one of the preceding claims. 13. Motor vehicle equipped with a device according to the preceding claim. 20