Pendulum damping device

Abstract

Pendulum damping device (20), comprising: a support (13) including a first drive arm (19) and a second drive arm (190) diametrically opposed; two pendulum bodies movable relative to the support (13); two first rolling members (40) guiding the movement of the first pendulum body and cooperating with two first rolling tracks (42) provided in the support (13); and two second rolling members (400) guiding the movement of the second pendulum body and cooperating with two third rolling tracks (420) provided in the support (13); the support (13) is adapted to receive only two pendulum bodies; and the first two bearing tracks (42) are positioned orthoradially on either side of the first drive arm (19), and the third two bearing tracks (420) are positioned orthoradially on either side of the second drive arm (190). (Abstract figure: 3)

Description

Title of the invention: Pendulum damping device technical field

[0001] The present invention relates to a pendulum damping device, in particular for a motor vehicle transmission system. Technological background

[0002] In such an application, the pendulum damping device can be integrated into a torsional damping system of a clutch capable of selectively connecting an internal combustion engine to a gearbox, in order to filter vibrations due to engine irregularities. Such a torsional damping system is, for example, a dual-mass flywheel. This dual-mass flywheel is, for example, integrated into a friction clutch disc or into a transmission system comprising a dry or wet dual clutch. In the latter case, the transmission system may or may not be integrated into a hybrid-powered vehicle.

[0003] It is known, for example from document CN210371835U, to provide a pendulum damping device comprising: • a mobile support rotating around an axis, and comprising a drive arm cooperating with elastic return mechanisms; • at least one pendulum body, movable relative to the support and comprising two pendulum masses respectively arranged axially on one side of the support, these two pendulum masses being joined together by a connecting element; and • two rolling elements guiding the movement of the pendulum body relative to the support, each rolling element cooperating with a first rolling track attached to the support and with a second rolling track attached to the pendulum body.

[0004] In the prior art, pendulum damping devices comprising a support and four pendulum bodies arranged in a distributed manner in the circumferential direction are known. In document CN210371835U, it is envisaged that the number of pendulum bodies may be as low as two in order to reduce the cost of the pendulum damping device when the damping requirement is lower. However, the geometry of the support in CN210371835U retains a geometry similar to that of a support for a pendulum damping device having four pendulum bodies. Thus, the geometry of such a support is not improved in order to reduce its cost and mass. Summary

[0005] In all that follows, ordinal numeral adjectives are used to differentiate features. They do not define the position of a feature. Therefore, for example, a third feature of a product does not mean that the product has a first and / or a second feature.

[0006] There is a need for a pendulum damping device having two pendulum bodies associated with a support having an improved geometry to allow for a reduction in its cost and mass.

[0007] The invention aims to meet this need and achieves this by means of a pendulum damping device comprising: • a mobile support rotating around a first axis and comprising a first drive arm and a second drive arm, the first drive arm and the second drive arm extending radially and being diametrically opposed; • pendulum bodies in strictly equal number of two, consisting of a first pendulum body and a second pendulum body, each pendulum body being mobile relative to the support and comprising two pendulum masses respectively arranged axially on either side of the support and at least one connecting member, these two pendulum masses being joined together by at least one connecting member; • two first rolling elements guiding the movement of the first pendulum body relative to the support, the first two rolling elements cooperating with two first rolling tracks formed in the support and with two second rolling tracks formed in the first pendulum body; and • two second rolling elements guiding the movement of the second pendulum body relative to the support, the two second rolling elements cooperating with two third rolling tracks provided in the support and with two fourth rolling tracks provided in the second pendulum body; the support being adapted to receive a number of pendulum bodies strictly equal to two; and

[0008] the first two bearing tracks being positioned orthoradially in whole or in part on either side of the first drive arm, and the third two bearing tracks being positioned orthoradially in whole or in part on either side of the second drive arm.

[0009] A number of pendulum bodies strictly equal to two makes it possible to reduce the cost of the pendulum damping device, in particular when the need for pendulum damping is less.

[0010] The structure of the pendulum damping device according to the invention makes it possible to obtain a support geometry in which the running tracks and the two drive arms are substantially aligned. Thanks to this feature, it is possible to manufacture the support from a narrow strip of material, thus limiting its cost and mass.

[0011] Furthermore, since the support is designed to receive exactly two pendulum bodies, there are no additional raceways for receiving any additional pendulum bodies. The amount of material used to create the geometry of the support can thus be further reduced to meet exclusively the strict requirement of providing raceways for only two pendulum bodies.

[0012] For the purposes of the present invention: • “axial” means “parallel to the first axis of rotation”; • “Radial” means “along an axis belonging to a plane orthogonal to the first axis of rotation and cutting this first axis of rotation"; • “orthoradial” means “perpendicular to a radial direction”; • “Circumferential” means “around the first axis of rotation”.

[0013] According to an additional feature of the invention, the support is made by a cutting process of a sheet of steel of constant thickness.

[0014] According to an additional feature of the invention, the support is made in one single piece.

[0015] Indeed, the structure of the pendulum damping device according to the invention makes it possible to obtain the geometry of the support from a narrow strip of material without having to manufacture the support in several parts. A support made in a single, monolithic piece proves easier to manufacture by avoiding the assembly and handling of sub-assemblies during the manufacturing process.

[0016] According to an additional feature of the invention: • a second axis and third axis are defined, the second axis extending radially and passing through the first drive arm and the second drive arm, and the third axis being perpendicular to the second axis and the first axis; • the first two running tracks are provided in the support together in the same first common window or separately in two first distinct windows, the first common window or the first two distinct windows taken together having a first width along the third axis measured at a first position along the second axis; • the two third running tracks are provided in the support either together in a single common second window or separately in two distinct second windows, the common second window or the two distinct second windows taken together having a second width along the third axis measured at a second position along the second axis; and • the support has an external contour, the external contour having a third width along the third axis measured at the first position, and a fourth width along the third axis measured at the second position; the ratio between the third width and the first width being between 1.05 and 1.5, and the ratio between the fourth width and the second width being between 1.05 and 1.5.

[0017] Thanks to this last characteristic, the width ratios as defined make it possible to determine a suitable compromise to limit the quantity of material used while ensuring sufficient mechanical strength of the support to resist the various mechanical stresses exerted on the pendulum damping device.

[0018] Regarding the windows of the support, the term "width" is to be interpreted as the maximum distance measured between two lines parallel to the second axis and tangent to the contours of the same common window or of the two separate windows taken together.

[0019] Regarding the external contour of the support, the term "width" is to be interpreted as the minimum distance measured between two lines parallel to the second axis and tangent to said external contour of the support.

[0020] According to a further feature of the invention, the support has an external contour adapted to ensure that the support faces axially the two pendulum masses of the two pendulum bodies in their entirety regardless of the position of said two pendulum bodies.

[0021] Thanks to this last characteristic, the external contour of the support as defined makes it possible to determine a suitable compromise to limit the quantity of material used while ensuring satisfactory axial guidance of the pendulum bodies in all their oscillation movements relative to the support.

[0022] According to a further feature of the invention, the support has two straight and parallel outer edges, the two outer edges being in particular positioned symmetrically with respect to the second axis.

[0023] Thus, the strip of material used to make the support has a simple geometry, which makes the cutting process and the associated tooling also simple to carry out and of reduced cost.

[0024] According to an additional feature of the invention, excluding the first drive arm and the second drive arm, the geometry of the support has a substantially oblong shape.

[0025] According to an additional feature of the invention, the geometry of the support has substantially a symmetry with respect to the second axis and with respect to the third axis.

[0026] According to a further feature of the invention, the first pendulum body and the second pendulum body together have a first moment of inertia and the support has a second moment of inertia, the ratio between the first moment of inertia and the second moment of inertia being between 1 and 3.5.

[0027] Indeed, the structure of the pendulum damping device according to the invention leads to a reduced moment of inertia of the support and therefore makes it advantageous to obtain a greater ratio between the first moment of inertia and the second moment of inertia, which is favorable to the damping performance.

[0028] According to a further feature of the invention, the first drive arm and the second drive arm extend radially, in particular radially outwards, to cooperate each with two elastic return members.

[0029] According to an additional feature of the invention, each elastic return member can be formed by a single spring or by several springs, for example by two concentric springs of different stiffness, the spring being able to be a straight spring or a curved spring, the springs being able to work together in series or in parallel.

[0030] According to one aspect of the invention, the first drive arm and the second drive arm define the portion of the support furthest from the first axis of rotation.

[0031] According to another aspect of the invention, the first drive arm and the second drive arm define the portion of the support closest to the first axis of rotation.

[0032] According to another aspect of the invention, the first drive arm and the second drive arm extend radially, in particular radially inwards, to cooperate with means for fixing the support.

[0033] According to an additional feature of the invention, the first drive arm and the second drive arm each extend circumferentially over an angular sector between 5 and 25°.

[0034] According to a first embodiment of the invention: • the first two running tracks are provided in the support together in the same first common window; • the two third running tracks are provided in the support together in the same second common window; • the two second rolling tracks are defined by an edge of a single spacer of the same connecting element of the first pendulum body; • the two fourth running tracks are defined by an edge of a single spacer of the same connecting element of the second pendulum body; and • the connecting element comprises, for each pendulum body, the single spacer and a connecting means linking the two pendulum masses and the single spacer, the connecting means being in particular a connecting means by riveting or by screwing or by welding or by press fitting.

[0035] This single-brace structure according to this first embodiment has the advantage of increasing the mass of the pendulum body in a confined space. The damping efficiency of each pendulum body is thereby increased, which allows the pendulum damping device to achieve sufficient damping efficiency even though the number of pendulum bodies is limited to two.

[0036] According to a second embodiment of the invention: • the first two running tracks are provided separately in the support in two separate first windows; • the two third running tracks are provided separately in the support in two separate second windows; • one of the second running tracks is defined by an edge of a first spacer of a first connecting member of the first pendulum body and the other of the second running tracks is defined by an edge of a second spacer of a second connecting member of the first pendulum body; • one of the fourth rolling tracks is defined by an edge of a first spacer of a first connecting member of the second pendulum body and the other of the fourth rolling tracks is defined by an edge of a second spacer of a second connecting member of the second pendulum body; • The connecting elements comprise, for each pendulum body, the first spacer, the second spacer, and a connecting means linking the first spacer, the second spacer and the two pendulum masses, the means of connection being in particular a means of connection by riveting or by screwing or by welding or by force fitting.

[0037] According to a third embodiment of the invention: • the first two running tracks are provided in the support separately in two distinct first windows; • the two third running tracks are provided in the support separately in two separate second windows; • the two second rolling tracks are defined by shapes formed in the two pendulum masses of the first pendulum body; • the two fourth rolling tracks are defined by shapes formed in the two pendulum masses of the second pendulum body; • the connecting elements link together for each pendulum body, the two pendulum masses, the connecting elements being in particular a means of connection by riveting or by screwing or by welding or by press fitting.

[0038] According to an additional feature of the invention, the first two rolling tracks, the second two rolling tracks, the third two rolling tracks and the fourth two rolling tracks have shapes chosen so that each of the pendulum bodies is moved relative to the support both in translation around a fictitious axis parallel to the first axis of rotation of the support, and also in rotation about itself, in particular in rotation about its center of gravity.

[0039] The rotational movement of the pendulum bodies introduced by this latter feature improves the damping performance of the pendulum damping device. Thus, using this feature, it becomes possible to reduce the amplitude of oscillations of the pendulum bodies, and therefore advantageously reduce the width of the support windows, and ultimately reduce the width of the external contour of the support according to the invention.

[0040] In all the foregoing, each rolling element is, for example, a roller. Each rolling element is, for example, a roller made of steel. The roller may be hollow or solid. This roller may have only one diameter along its entire longitudinal axis.

[0041] In all the above, each pendulum body may carry one or more stop damping elements that can come into contact with the support to dampen the stop of the pendulum body against the latter, for example at the end of a displacement in the trigonometric and / or non-trigonometric direction of this pendulum body and / or in the event of a radial fall of the pendulum body, for example when the thermal engine of the vehicle is stopped.

[0042] Each stop damping element may have elastic properties that allow for the damping of shocks related to contact between the support and the pendulum body. This damping is achieved by compressing the stop damping element. The stop damping element is, for example, made of elastomer or rubber.

[0043] According to the first embodiment, each pendulum body can include a single stop damping element acting in all the cases mentioned above to dampen the stop of the pendulum body against the support, and this single damping element can extend continuously along all or part of the radially inner face of a spacer of the connecting element of the pendulum body.

[0044] In all the above, in the pendulum damping device, all the first bearing tracks attached to the support can have exactly the same shape to each other and / or all the second bearing tracks attached to the pendulum body can have exactly the same shape to each other.

[0045] The invention further relates to a component for a motor vehicle transmission system, the component being a torsional damper, and comprising: • a primary part comprising a torque input element; • a secondary part comprising the pendulum damping device as described above and a torque output element; and • elastic return elements, in particular a plurality of springs, elastically coupling in rotation the primary part and the secondary part.

[0046] The invention further relates to a component for a motor vehicle transmission system, the component being a double-mass flywheel, and comprising: • a primary mass comprising a torque input element in the form of a primary flywheel intended to be driven in rotation by a driving shaft; • a secondary mass comprising the pendulum damping device as described above and a torque output element in the form of a secondary flywheel or hub capable of cooperating, directly or via a clutch, with a driven shaft; and • elastic return devices, in particular a plurality of springs, elastically coupling in rotation the primary mass and the secondary mass.

[0047] The driving shaft can be, for example, a crankshaft from a heat engine.

[0048] The driven shaft can be, for example, the input shaft of a gearbox or the input shaft of a dual clutch, dry or wet.

[0049] According to one aspect of the invention, the component is a double-mass flywheel which includes a chamber containing grease and in which the elastic return elements are housed, the pendulum damping device being positioned inside said chamber, the pendulum bodies are notably positioned radially below the elastic return mechanisms.

[0050] According to another aspect of the invention, the component is a double damper flywheel which includes a chamber containing grease and in which the elastic return elements are housed, the pendulum damping device being positioned outside said chamber, the pendulum bodies being in particular positioned axially opposite the elastic return elements.

[0051] The invention further relates to a transmission system, in particular for a hybrid vehicle, comprising the component described above and a clutch or a dual clutch, dry or wet, receiving the torque at the output of this component.

[0052] The transmission system may further include: • a gearbox, comprising gears, defining gear ratios; and • a front axle and / or a rear axle.

[0053] The invention also relates, according to another aspect, to a hybrid vehicle powertrain, comprising: • the above transmission system; and • a rotating electric propulsion machine, the shaft of the rotating electric machine being fixed in rotation: • of a gearbox input shaft; or • of the gearbox output shaft; or • of free-running gears in the gearbox; or • of the front axle or the rear axle; or • of the crankshaft of the vehicle's internal combustion engine.

[0054] The rotating electrical machine has, for example, a nominal supply voltage of 48V, or a nominal supply voltage greater than 200V, in particular 300V. Brief description of the figures

[0055] [Fig-1] Fig. 1 represents a schematic isometric view of a double flywheel shock absorber with a pendulum damping device according to the invention.

[0056] [Fig.2] The [Fig.2] is a schematic front view of a pendulum damping device according to a first embodiment of the invention.

[0057] [Fig.3] Fig.3 is a schematic front view of a pendulum damping device according to the first embodiment of the invention differing from that of Fig.2 in that the pendulum masses of the pendulum bodies are not shown for reasons of clarity.

[0058] [Fig.4] Fig.4 is a schematic view of a pendulum damping device according to the first embodiment of the invention identical to Fig.3, on which additional references are indicated separately for clarity.

[0059] [Fig.5] The [Fig.5] is a schematic front view of a pendulum damping device according to a second embodiment of the invention in which the pendulum masses of the pendulum bodies are not shown for reasons of clarity.

[0060] [Fig.6] Fig.6 is a schematic view of a pendulum damping device according to the second embodiment of the invention identical to Fig.5, on which additional references are indicated separately for clarity.

[0061] [Fig.7] The [Fig.7] is a schematic front view of a pendulum damping device according to a third embodiment of the invention in which the pendulum masses of the pendulum bodies are not shown for reasons of clarity.

[0062] [Fig.8] The [Fig.8] is a partial schematic front view of a pendulum damping device according to the first embodiment of the invention in which a pendulum body is in a stop position. Description of the implementation methods

[0063] In all the figures, identical elements or elements performing the same function are identified by the same reference numerals. The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference numeral relates to the same embodiment or that the features apply only to a single embodiment. Simple features from different embodiments can also be combined or interchanged to provide other embodiments.

[0064] Figure 1 shows a component 1 for a transmission system incorporating a pendulum damping device 20. This component 1 is here a double damper flywheel which is intended for example to be associated with a wet dual clutch and / or to be integrated into a hybrid vehicle powertrain.

[0065] Component 1 comprises, as can be seen in [Fig. 1], a primary mass and a secondary mass. The primary mass may include a torque input element in the form of a primary flywheel 2 suitable for being attached to the crankshaft of an internal combustion engine by means of screws. The internal combustion engine is, for example, a three- or four-cylinder engine.

[0066] The secondary mass comprises, as shown in [Fig. 1], a hub 12 with splines for mounting on a shaft, a flange 13, also called a "sail," fixed to the hub 12 by rivets 15, and two pendulum bodies, each pendulum body comprising two pendulum masses 14 arranged axially on one side of the sail 13, the latter acting as a support for the pendulum bodies. The secondary mass thus incorporates a pendulum damping device 20, of which the sail 13 forms the support.

[0067] Component 1 may further include elastic return elements 18 limiting the rotation of the secondary mass relative to the primary mass about a first axis XL. Two sets of concentric springs 18 are provided here, and these are curved springs. As can be seen in [Fig. 1], the web 13 includes two drive arms 19, 190, each defining an outward radial extension, and each of these drive arms 19, 190 comes into contact with a set of springs 18 when the secondary mass rotates about the first axis XI relative to the primary mass. In the example described, the primary flywheel 2 defines a boundary for the outward radial movement of the springs 18.

[0068] In figures 1, 2 and 3, the pendulum damping device 20 is at rest, that is to say it does not filter the torsional oscillations due to the acyclics of the heat engine.

[0069] As illustrated in Figures 2 and 3, the pendulum damping device comprises: • the support 13 movable in rotation around the first axis XI and comprising the first drive arm 19 and the second drive arm 190, the first drive arm 19 and the second drive arm 190 extending radially and being diametrically opposed; • pendulum bodies in strictly equal number of two, consisting of a first pendulum body and a second pendulum body, each pendulum body being mobile relative to the support 13 and comprising two pendulum masses 14 respectively arranged axially on either side of the support 13, these two pendulum masses 14 being joined together by at least one connecting member 30; • two first rolling members 40 guiding the movement of the first pendulum body relative to the support 13, the first two rolling members 40 cooperating with two first rolling tracks 42 formed in the support 13 and with two second rolling tracks 43 formed in the first pendulum body; and • two second bearing elements 400 guiding the movement of the second pendulum body relative to the support 13, the two second rolling elements 400 cooperating with two third rolling tracks 420 provided in the support 13 and with two fourth rolling tracks 430 provided in the second pendulum body.

[0070] The first two bearing tracks 42 are positioned orthoradially in whole or in part on either side of the first drive arm 19, and the two third bearing tracks 420 are positioned orthoradially in whole or in part on either side of the second drive arm 190.

[0071] The rolling elements 40 are here rollers, each roller maintaining a substantially constant diameter over its entire length.

[0072] In a first embodiment according to the invention shown in Figures 2 and 3, the pendulum damping device 20 may comprise: • two first rolling tracks 42 provided in the support 13 together in the same first common window 33; • two third rolling tracks 420 provided in the support 13 together in the same second common window 330; • two second rolling tracks 43 defined by an edge of a single spacer 31 of the same connecting element 30 of the first pendulum body; • two fourth running tracks 430 defined by an edge of a single spacer 31 of the same connecting member 30 of the second pendulum body; and • the connecting member 30 comprising, for each pendulum body, the single spacer 31 and a connecting means linking the two pendulum masses 14 and the single spacer 31, the connecting means here being a riveting connecting means made by a plurality of rivets 34.

[0073] As illustrated in [Fig. 2], the device 20 may also include stop damping elements 50 adapted to simultaneously come into contact with a spacer 31 and with the support 13 in certain relative positions of the support 13 and the pendulum masses 14, such as when they come into contact after a displacement from the rest position to filter a torsional oscillation or during a radial fall of the pendulum body. Each stop damping element 50 is, for example, integral with a pendulum body, being mounted on each pendulum body and arranged so as to be interposed radially between the spacer 31 of this pendulum body and the contour 35 of the window 33. Each stop damping element 50 comprises, for example, one or more parts fixed to the spacer 31.

[0074] As illustrated in [Fig. 2], axial interposition pieces between the pendulum body and the support 13, also called "pads," may be provided. One or more pads are, for example, fixedly supported by each pendulum mass 14, on their face opposite the support 13. The attachment of these pads can be for example via 55 pawls received in openings made in the pendulum masses 14.

[0075] In a second embodiment according to the invention shown in [Fig. 5], the pendulum damping device 20 may comprise: • two first rolling tracks 42 provided separately in the support 13 in two first distinct windows 60; • the two third running tracks 420 provided separately in the support 13 in two separate second windows 600; • one of the second rolling tracks 43 being defined by an edge of a first spacer 31 of a first connecting member 30 of the first pendulum body and the other of the second rolling tracks being defined by an edge of a second spacer 31 of a second connecting member of the first pendulum body; • one of the fourth rolling tracks 430 being defined by an edge of a first spacer 31 of a first connecting member of the second pendulum body and the other of the fourth rolling tracks 430 being defined by an edge of a second spacer 31 of a second connecting member of the second pendulum body; • the connecting elements comprising for each pendulum body, the first spacer 31 and the second spacer 31 and a connecting means linking the first spacer 31 and the second spacer 31 to the two pendulum masses 14, the connecting means being here a riveting connection.

[0076] Figure 7 illustrates a third embodiment according to the invention which differs from the first embodiment in that the first drive arm 19 and the second drive arm 190 can extend radially inwards and can cooperate with means for fixing the support 13. In this example, the means for fixing the support can be holes provided in the first drive arm 19 and the second drive arm 190 into which rivets are inserted in order to fix the pendulum damping device to the secondary mass of the double damper flywheel.

[0077] As illustrated in Figures 4 and 6: • a second axis X2 and third axis X3 are defined, the second axis X2 extending radially and passing through the first drive arm 19 and the second drive arm 190, and the third axis X3 being perpendicular to the second axis X2 and the first axis XI; • the first two bearing tracks 42 can be provided in the support 13 together in the same first common window 33 or separately in two separate first windows 60 taken together, the first common window 33 or the first two separate windows 60 having a first width L1 along the third axis X3 measured at a first position PI along the second axis X2; • the two third bearing tracks 420 can be provided in the support 13 together in a single common second window 330 or separately in two distinct second windows 600 taken together, the common second window 330 or the two distinct second windows 600 having a second width L2 measured along the third axis X3 measured at a second position P2 along the second axis X2; and • the support 13 may include an external contour 36, the external contour 36 having a third width L3 along the third axis X3 measured at the first position PI, and a fourth width L4 along the third axis X3 measured at the second position P2;

[0078] The ratio between the third width L3 and the first width L1 can be between 1.05 and 1.5, and the ratio between the fourth width L4 and the second width L2 can be between 1.05 and 1.5.

[0079] In all embodiments of figures 1 to 8, the support 13 may include two external edges 37,38 which are straight and parallel to each other, the two external edges 37,38 being in particular positioned symmetrically with respect to the second axis X2.

[0080] Figure 8 illustrates a configuration of the damping device where a pendulum body is positioned against a stop after a displacement from the rest position to filter a torsional oscillation. The external contour 36 of the support 13 can be adapted so that, regardless of the position of the pendulum bodies and particularly in this stop position, the support 13 can axially face the two pendulum masses 14 of the two pendulum bodies.

[0081] As illustrated in particular by figures 2, 3 and 8, the first two rolling tracks 42, the second two rolling tracks 43, the third two rolling tracks 420 and the fourth two rolling tracks 430 can have shapes chosen so that each of the pendulum bodies is moved relative to the support 13 both in translation around a fictitious axis parallel to the first axis of rotation XI of the support 13, and also in rotation about itself, in particular in rotation about its center of gravity.

[0082] It is emphasized that all the features, as they are apparent to a person skilled in the art from the present description, the drawings and the attached claims, even if in practice they have only been described in relation to other specific features, both individually and in any combinations, can be combined with other features or groups of characteristics disclosed here, insofar as this has not been expressly excluded or technical circumstances render such combinations impossible or meaningless.

[0083] The use of the verb "comporter", "comprendre" and its conjugated forms does not exclude the presence of other elements or other steps than those stated in a claim.

[0084] In the claims, any reference sign in parentheses shall not be interpreted as a limitation of the claim.

Claims

1. Demands Pendulum damping device (20), comprising: • a support (13) movable in rotation about a first axis (XI) and comprising a first drive arm (19) and a second drive arm (190), the first drive arm (19) and the second drive arm (190) extending radially and being diametrically opposed; • pendulum bodies in strictly equal number of two, consisting of a first pendulum body and a second pendulum body, each pendulum body being mobile relative to the support (13) and comprising two pendulum masses (14) respectively arranged axially on either side of the support (13) and at least one connecting member, these two pendulum masses (14) being joined together by at least one connecting member (30); • two first rolling members (40) guiding the movement of the first pendulum body relative to the support (13), the first two rolling members (40) cooperating with two first rolling tracks (42) formed in the support (13) and with two second rolling tracks (43) formed in the first pendulum body; and • two second rolling members (400) guiding the movement of the second pendulum body relative to the support (13), the two second rolling members (400) cooperating with two third rolling tracks (420) provided in the support (13) and with two fourth rolling tracks (430) provided in the second pendulum body; characterized in that: • the support (13) is adapted to receive a number of pendulum bodies strictly equal to two; and • the first two bearing tracks (42) are positioned orthoradially, in whole or in part, on either side of the first drive arm (19), and the two

2. third rolling tracks (420) are positioned orthoradially in whole or in part on either side of the second drive arm (190). Pendulum damping device (20) according to claim 1, wherein: • a second axis (X2) and third axis (X3) are defined, the second axis (X2) extending radially and passing through the first drive arm (19) and the second drive arm (190), and the third axis (X3) being perpendicular to the second axis (X2) and the first axis (XI); • the first two bearing tracks (42) are provided in the support (13) together in the same first common window (33) or separately in two first distinct windows (60), the first common window (33) or the first two distinct windows (60) taken together having a first width (Ll) along the third axis (X3) measured at a first position (PI) along the second axis (X2); • the two third bearing tracks (420) are provided in the support (13) together in a single common second window (330) or separately in two distinct second windows (600), the common second window (330) or the two distinct second windows (600) taken together having a second width (L2) along the third axis (X3) measured at a second position (P2) along the second axis (X2); and • the support (13) has an external contour (36), the external contour (36) having a third width (L3) along the third axis (X3) measured at the first position (PI), and a fourth width (L4) along the third axis (X3) measured at the second position (P2); in which the ratio between the third width (L3) and the first width (L1) is between 1.05 and 1.5, and the ratio between the fourth width (L4) and the second width (L2) is between 1.05 and 1.

5.

3. Pendulum damping device (20) according to any one of the preceding claims, wherein the support (13) has an external contour (36) adapted to ensure that the support (13) faces axially the two pendulum masses (14) of the two pendulum bodies in their entirety regardless of the position of said two pendulum bodies.

4. Pendulum damping device (20) according to any one of the preceding claims, wherein the support (13) has two straight and parallel outer edges (37,38), the two outer edges (37,38) being in particular positioned symmetrically with respect to a second axis (X2), the second axis (X2) extending radially and passing through the first drive arm (19) and the second drive arm (190).

5. Pendulum damping device (20) according to any one of the preceding claims, wherein the first pendulum body and the second pendulum body together have a first moment of inertia (II) and the support has a second moment of inertia (12), the ratio between the first moment of inertia and the second moment of inertia being between 1 and 3.

5.

6. Pendulum damping device (20) according to any one of the preceding claims, wherein the first drive arm (19) and the second drive arm (190) extend radially, in particular radially outwards, to cooperate each with two elastic return members (18).

7. Pendulum damping device (20) according to any one of the preceding claims, wherein the first drive arm (19) and the second drive arm (190) extend radially, in particular radially inwards, to cooperate with support fixing means (13).

8. Pendulum damping device (20) according to any one of the preceding claims, wherein: • the first two bearing tracks (42) are provided in the support (13) together in the same first common window (33); • the two third bearing tracks (420) are provided in the support (13) together in the same second common window (330); • the two second running tracks (43) are defined by an edge of a single spacer (31) of the same connecting member (30) of the first pendulum body; • the two fourth running tracks (430) are defined by an edge of a single spacer (31) of the same connecting member (30) of the second pendulum body; and • the connecting member (30) comprises, for each pendulum body, the single spacer (31) and a connecting means linking the two pendulum masses (14) and the single spacer (31), the connecting means being in particular a means of connection by riveting (34) or by screwing or by welding or by press fitting.

9. Pendulum damping device (20) according to any one of the preceding claims, wherein the first two bearing tracks (42), the second two bearing tracks (43), the third two bearing tracks (420) and the fourth two bearing tracks (430) have shapes chosen so that each of the pendulum bodies is displaced relative to the support (13) both in translation around a fictitious axis parallel to the first axis of rotation (XI) of the support (13), and also in rotation about itself, in particular in rotation about its center of gravity.

10. Component (1) for a motor vehicle transmission system, the component being a torsional damper, and comprising: • a primary part having a torque input element; • a secondary part having the pendulum damping device (20) according to any one of the preceding claims and a torque output element; and • elastic return elements (18), in particular a plurality of springs, elastically coupling in rotation the primary part and the secondary part.

11. Component (1) for a motor vehicle transmission system, the component being a dual-mass flywheel, and comprising: • a primary mass comprising a torque input element in the form of a primary flywheel (2) intended to be driven in rotation by a driving shaft; • a secondary mass comprising the pendulum damping device (20) according to any one of the preceding claims and a torque output element in the form of a secondary flywheel or a hub (12) capable of cooperating, directly or via a clutch, with a driven shaft; and • elastic return elements (18), in particular a plurality of springs, elastically coupling in rotation the primary mass and the secondary mass.

12. Transmission system, in particular for hybrid vehicle, comprising: • the component (1) according to claim 10 or 11, and • a clutch or a dual clutch, dry or wet, receiving the torque at the output of this component (1).

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