FR3064324A1 - PENDULAR DAMPING DEVICE - Google Patents

Abstract

A pendulum damping device (1, 12, 13, 19) for transmitting a motor vehicle of the type comprising: - a support (2) driven in rotation about an axis (XX ') of said transmission; - at least one pendulum body (3, 6, 7, 14, 22) comprising at least one pendulum mass (3, 14, 22) and first and second rolling members (6, 7), said pendulum body (3, 6, 7, 14, 22) being movable relative to said support (2) in a combined movement of translation and rotation, said first and second rolling members (6, 7) cooperating with: at least first and second tracks internal bearing (8, 9) integral with said pendulum mass (3, 14, 22) and associated, respectively, audits first and second rolling members (6, 7); at least first and second outer races (10, 11) integral with said support (2) and associated, respectively, with said first and second rolling members (6, 7).

Description

TECHNICAL FIELD OF THE INVENTION.

The present invention relates to a pendulum damping device, in particular for a motor vehicle.

TECHNOLOGICAL BACKGROUND OF THE INVENTION.

Such a device, also called a pendulum oscillator or pendulum, is in particular intended to equip a transmission of a motor vehicle.

îo In a motor vehicle transmission, at least one torsional damping system is generally associated with a clutch capable of selectively connecting the engine to a gearbox, such as a friction clutch or a hydrokinetic coupling device comprising a locking clutch.

Indeed, an internal combustion engine generates acyclisms due to the successive explosions in the engine cylinders, these acyclisms varying in particular depending on the number of cylinders.

The damping system, which conventionally includes springs and friction elements, therefore has the function of filtering torsional vibrations due to the rotational acyclisms of the engine and intervenes before the transmission of engine torque to the gearbox. This is to prevent such vibrations from entering the transmission and causing unwanted impact, noise and noise.

In order to further improve filtration, it is known to use a pendulum damping device, in addition to the usual damping system.

For example, patent application FR3037114, in the name of the applicant, discloses a device for damping torsional oscillations comprising pendulum damping means constituted by pendulum masses movably mounted on an annular support arranged between an element torque input and a torque output element, and rotated about its axis.

In reaction to irregularities or acyclic rotation, each mass oscillates in a pendulum. The oscillation frequency of each mass is proportional to the speed of rotation of the motor shaft, the corresponding multiple being able by

-2 example take a value close to the rank of the preponderant harmonic of the vibrations responsible for the strong irregularities of rotation in the vicinity of the idle.

In this example, rolling tracks associated with rolling members allow a displacement in translation of the centers of gravity of the pendular masses and a rotational movement of these pendular masses around their centers of gravity.

Complex raceway profiles with multiple radii of curvature make it possible to avoid sliding of the running gear and to obtain satisfactory filtering performance.

A pendulum damping device is calculated to be adapted to a given internal combustion engine, and in particular to the number of excitations per revolution linked to the combustion of the air-fuel mixture in the cylinders of this engine.

However, it can be seen that the damping is not always perfect and that there are most often engine speeds leading to pendulum saturation problems with regard to the filtration of acyclisms.

In order to solve these problems, the applicant proposes in patent application FR3014519 a pendulum torsion damping device with improved filtration efficiency.

In this device, a variation in the radius of curvature of the rolling tracks produces an under-adaptation of the local order of the pendulum over a range of pendulum deflection close to the maximum deflection, which makes it possible to obtain effective pendulum damping with a reduction in saturation phenomena at low engine speed, without causing saturation phenomena at high engine speed.

However, the profiles of the running tracks again have multiple radii of curvature, established from complex mathematical formulas, and are difficult to produce.

GENERAL DESCRIPTION OF THE INVENTION.

The object of the present invention is therefore to provide a pendular damping device for the transmission of a motor vehicle capable of operating without sliding with maximum clearance while overcoming the above drawbacks.

This pendulum damping device is of the type comprising:

- a support driven in rotation about a transmission axis;

- 3 - at least one pendulum body comprising at least one pendulum mass and first and second rolling members, the pendulum body being movable relative to the support according to a combined movement of translation and rotation, these first and second rolling members cooperating with:

- At least first and second internal rolling tracks integral with the pendulum mass and associated, respectively, with the first and second rolling members;

- At least first and second external rolling tracks secured to the support and associated, respectively, with the first and second rolling members.

According to the invention the first and second internal raceways are symmetrical respectively with respect to first and second axes of symmetry in a radial plane forming a first angle greater than a second angle formed by first and second combination axes defined in this radial plane, in a pendulum body rest position, respectively by first and second internal and external points of contact of the rolling members with the first and second internal and external rolling tracks, respectively.

According to the invention, in the rest position, the contact points of the rolling members on the internal rolling tracks do not belong to the axes of symmetry of the tracks.

According to the invention, the difference between the first angle and the second angle can be between 10 ° and 30 °, preferably between 14 ° and 18 °.

Preferably, the first and second internal raceways are symmetrical with respect to an axial plane.

Preferably also the first and second external raceways are symmetrical with respect to this same axial plane.

In the pendulum damping device according to the invention also, the first and second internal raceways are very advantageously circular, in particular of the same radius.

According to one aspect of the invention, the first and second external rolling tracks can be chosen so that the pendular body is tuned to a filtering order of the torsional oscillations which is substantially constant.

As a variant, said first and second external rolling tracks can be chosen so that the pendular body is tuned to a filtering order of variable torsional oscillations, in particular continuously increasing, in particular increasing by level. External raceways can

-4 present a variable radius of curvature. The external raceways can have an increasing radius of curvature, in particular continuously increasing, in particular increasing by level.

According to the invention also, rolling axes of the first and second rolling members in the rest position being seen from said axis of rotation in the radial plane at a reference angle, a combination depending on the second angle can be defined by the expression:

C = (second angle / reference angle) * 100.

Combination C can be between 101% and 115%. Alternatively, the combination can be between 85% and 99%.

In a first embodiment of the pendulum damping device according to the invention, the pendulum body comprises:

- two copies of the pendulum mass arranged on either side of the support;

- two connecting members matching these examples and defining the first and second internal raceways;

and the support comprises two parts of an edge of one or two slots defining the first and second external raceways, the connecting members being partially housed inside the slot or slots.

In such an embodiment, when the first and second internal tracks are symmetrical and circular, the connecting members can be manufactured identically. It then suffices to tilt them when they are fixed to the pendulum masses so as to obtain the desired angular difference with the second angle. This makes it possible to manufacture only one type of connecting member and thus to reduce manufacturing costs.

As a variant of this first embodiment of the pendulum damping device according to the invention, the pendulum body comprises two copies of the pendulum mass arranged on either side of the support and matched by connecting members, the first and second internal raceways being formed inside first and second housings in these examples and the first and second external raceways also being formed in slots in the support.

In a second embodiment of the pendulum damping device according to the invention, the pendulum body is arranged between two support elements axially offset, the first and second internal raceways being formed inside first and second oblong holes in the pendulum mass,

- 5 and the first and second external raceways being formed by edges of first and second oblong openings in these elements.

These few specifications will have made it obvious to those skilled in the art the advantages provided by the pendulum damping device according to the invention compared with the prior art in terms of optimizing the travel of the bearing members on the running tracks.

The rest position of the pendulum damping device is observed when the pendulum mass is centrifuged but the support is not subjected to torsional oscillations.

îo In all of the above, the device comprises for example a number of pendulum bodies of between two and eight, in particular between three and seven pendulum bodies, preferably five pendulum bodies distributed regularly around the axis of rotation. When the device comprises five pendulum bodies, the reference angle can be substantially equal to 36 °.

The device can thus include a plurality of planes perpendicular to the axis of rotation in each of which all the pendulum bodies are arranged.

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

The invention also relates, according to a third aspect, to a component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter, a flywheel secured to the crankshaft, or a disc of clutch friction or a wet or dry double clutch, or a hybrid transmission system component, or a simple wet clutch, this component comprising a pendular damping device as defined above.

The support of the pendulum 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.

In the case where the device is integrated into a flywheel secured to the crankshaft, the support can be secured to this flywheel.

The component is in particular a clutch friction disc or a double shock-absorbing flywheel.

The component may include a sub-assembly capable of transmitting the engine torque propagating in the transmission system.

The detailed specifications of the invention are given in the description which follows in conjunction with the attached drawings. It should be noted that these drawings have no other purpose than to illustrate the text of the description and do not in any way constitute a limitation of the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS.

Figure 1 shows schematically a pendulum damping device known from the state of the art.

Figures 2a and 2b are respectively simplified axial views of part of the pendulum damping device shown in Figure 1 in a rest position, and in a different configuration of its operation, corresponding to a position of maximum deflection on the left .

Figure 3 is an axial view of part of a pendulum damping device according to the invention in a first embodiment.

FIGS. 4a and 4b are respectively simplified axial views of part of a pendular damping device according to the invention in the first embodiment, shown in a rest position, and in a different configuration of its operation, corresponding to a maximum deflection position on the left.

Figure 5 is an axial view of part of a pendulum damping device according to the invention in a variant of the first embodiment.

Figure 6 is an axial view of part of a pendulum damping device according to the invention in a second embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION.

The example of a pendulum damping device 1 known from the aforementioned state of the art is shown in Figure 1.

It basically includes:

- An annular support 2 able to be driven in rotation about an axis XX ';

- pendulum bodies comprising two copies of pendulum masses 3 arranged on either side of the support 2 at its periphery.

-7These pendulum masses 3, of the general shape of a circular segment, are matched by means of connecting spacers 4 partially housed inside the oblong slots 5 in the support 2, as shown in Figures 2a and 2b

They are movable by means of first and second rolling members 6, 7 rolling, on the one hand, on first and second internal rolling tracks 8, 9 formed on the connecting spacers 4 and, on the other hand, in s pressing and rolling on first and second external rolling tracks 10, 11 formed by edges of the slots 5 of the support 2.

In the rest position of the pendulum damping device 1 shown in Figure 2a, that is to say when the pendulum masses 3 do not oscillate, the first and second rolling members 6, 7 are in contact with the first and second internal raceways 8, 9 at first and second internal contact points A and A '.

In a maximum movement of the pendular masses 3, as shown in FIG. 2b, these first and second internal contact points, in positions A and A ′ at rest, are moved towards the ends of the first and second internal rolling tracks 8, 9, in other positions A1 and ΑΊ, but without reaching them.

In this state of the art, the inventive unit has therefore found that the rolling members 6, 7 do not roll over the entirety of the connecting spacers 4, which corresponds to a lack of optimization of the pendulum damping device 1.

In the pendulum damping device 12 according to the invention, of which Figure 3 represents a partial view, in the rest position, in a first embodiment corresponding to one of the types of devices represented in Figures, 1, 2a and 2b, the rolling members 6, 7 roll on the contrary over the entirety of the rolling tracks of the connecting spacers 4.

To this end, the first and second internal raceways 8, 9 are symmetrical respectively with respect to first and second axes of symmetry D, D 'in a radial plane R which form a first angle a1 greater than a second angle a2 formed by first and second combination axes AB, A'B 'defined in this radial plane R. In the example of FIG. 3, the connecting spacers 4 are also symmetrical in the plane of the figure, with respect to the axes of symmetry D, D '

- 8 In a manner known to those skilled in the art, these first and second combination axes AB, A'B 'are defined for the pendulum body 3, 6, 7, that is to say all of the two masses pendulars 3 and rolling members 6, 7, respectively by first and second internal and external contact points A, B; A ', B' of the rolling members 6, 7 with the first and second internal and external rolling tracks, respectively.

In a particular implementation of this first embodiment, shown in Figure 3, the first and second internal raceways 8, 9 are symmetrical with respect to an axial plane S, as well as the connecting spacers 4 in which they are formed .

To allow maximum travel, the lights 5 align with the connecting spacers 4 that they house, as shown in Figure 3.

As the first and second internal raceways 8, 9, as well as the connecting struts 4, the first and second external raceways 10, 11 as well as the slots 5 in which they are formed are, in this particular implementation , symmetrical with respect to the axial plane S.

By working with computer models of the pendulum damping device 12 according to the invention, the inventive entity has determined that the deflection of the pendulum masses 3 is generally optimum when a difference between the first angle a1 and the second angle a2 is understood between 10 ° and 30 °, preferably between 14 ° and 18 °.

The result of this more inclined configuration of the internal and external raceways 8, 9; 10, 11 according to the invention by comparison with a standard configuration shown in Figures 2a and 2b is illustrated by Figures 4a and 4b.

While the rest positions of the first and second internal contact points A, A 'are identical (Figure 4a), the first and second rolling elements 6, 7 reach the ends of the first and second internal rolling tracks 8, 9 in positions A2, A'2 as shown by the

Figure 4b.

By taking as a design parameter a reference angle a under which the axis of rotation XX 'are seen in the radial plane R of the rolling axes C, C' of the first and second rolling members 6, 7 in the position of rest, the inventive entity also determined that a combination C function of the second angle a2 defined by the expression:

-9C = (α2 / α) * 100 between 101% and 115% allowed this optimum travel.

A particular model of the pendulum damping device 12 according to the invention having the following characteristics has been studied:

- order: 3.42;

- reference angle a: 36 ° (or twice 18 °, if one considers one of the rolling axes C, C 'seen from the axis of rotation XX' relative to the axial plane of symmetry S );

- turning radius of a center of gravity of the pendulum mass 3 around the axis of rotation XX ': 176.35 mm;

- internal radius of the first and second internal rolling tracks 8, 9:

21.3 mm

- second angle a2: 39.6 ° (or twice 19.8 °, if we consider an inclination of one of the combination axes AB; A'B 'relative to the axial plane of symmetry S), c' i.e. a combination C of 110% (110% of the reference angle a).

By giving the first angle a1 a value of 56.90 ° (or twice 28.45%, if we consider the inclination of the axis of symmetry D, D 'of a spacer 4 relative to the axial plane symmetry S), that is to say by allowing the connecting spacers 4 to have their own combination axes, in terms of trade, we obtain a travel gain of 12% (15 mm instead of 13.4 mm in a standard configuration, i.e. when the first and second angles are equal).

In the example considered, the first and second external rolling tracks can be chosen so that the pendulum bodies are tuned to a filtering order of the torsional oscillations which is substantially constant.

As a variant, said first and second external rolling tracks can be chosen so that the pendular bodies are tuned to a filtering order of variable torsional oscillations, in particular continuously increasing, in particular, increasing by level. The external raceways can have a variable radius of curvature. The external raceways can have an increasing radius of curvature, in particular continuously increasing, in particular increasing by level.

In the particular implementation of the pendulum damping device 12 according to the invention shown in Figure 3, the first and second external rolling tracks 10, 11 each have a profile formed by two arcs of

10 circles having a first and a second different radius to make effective the gain in clearance obtained by the inclination of the connecting spacers 4 while respecting a necessary clearance (of the order of 10 μm) between the rolling members 6, 7 and the first and second internal and external tracks 8, 9; 10,

11.

The optimal values for these first and second radii are 19.1 mm and 16.0 mm, respectively.

A variant of the first embodiment of the pendulum damping device 13 according to the invention is partially shown in FIG. 5.

îo In this variant 13, two pendulum masses 14 arranged on either side of the single support 2 are matched by connecting members 15, which take the form of rivets, bolts or spacers passing through the support 2 in suitable recesses 16, without these supporting other first and second internal raceways 8, 9.

In this variant 13, the first and second internal raceways

8, 9 of the first and second rolling members 6, 7 are in fact formed inside first and second housings 17, 18 of the pendular masses 14.

The first and second external rolling tracks 10, 11 remain formed by the edges of the openings 5 of the support 2.

A second embodiment of the pendulum damping device 19 according to the invention is partially shown in FIG. 6.

In this second embodiment, the support 2 consists essentially of two annular sheets 20 facing each other mounted by bolts 21 on an intermediate piece which ensures the rotation of the assembly and the transmission of torque.

At the periphery of the support 2 are mounted between the annular sheets 20 of the pendulum masses 22, a single copy of which is shown in FIG. 6.

The pendulum mass 22 is mobile thanks to first and second rolling members 6, 7 rolling, on the one hand, on the first and second internal rolling tracks 8, 9 inside first and second oblong holes 23, 24 with which it is provided, and, on the other hand, in this second embodiment, by resting and rolling at their ends on the first and second external rolling tracks 10, 11 formed by the edges of first and second oblong openings 25 , 26 formed in the annular sheets 20.

-11 It goes without saying that the invention is not limited to the preferential embodiments described above.

In particular, the numerical values indicated correspond only to exemplary embodiments of the invention.

The invention embraces, on the contrary, all the possible variant embodiments within the limits of the subject of the claims below.

Claims (12)

1) Pendulum damping device (1, 12, 13, 19) for transmitting a motor vehicle of the type comprising: - a support (2) driven in rotation about an axis (XX ¹ ) of said transmission; 5 - at least one pendulum body (3, 6, 7, 14, 22) comprising at least one pendulum mass (3, 14, 22) and first and second rolling members (6, 7), said pendulum body (3 , 6, 7, 14, 22) being movable relative to said support (2) according to a combined movement of translation and rotation, said first and second rolling members (6, 7) cooperating with: îo - at least first and second internal rolling tracks (8, 9) integral with said pendulum mass (3, 14, 22) and associated, respectively, with the first and second rolling bodies audits (6, 7); - at least first and second external rolling tracks (10, 11) integral with said support (2) and associated, respectively, with first and second organs audits 15 bearing (6, 7); characterized in that said first and second internal raceways (8, 9) are symmetrical respectively with respect to first and second axes of symmetry (D, D ') in a radial plane (R) forming a first angle (a1) greater than a second angle (a2) formed by first and second combination axes (AB, 20 A'B ') defined in said radial plane (R), in a rest position of said pendulum body (3, 6, 7, 14, 22), respectively by first and second internal and external contact points (A, B; A ', B') of said rolling members (6, 7) with said first and second internal and external rolling tracks (8, 9; 10, 11), respectively. 2) pendulum damping device (12, 13, 19) according to claim 1, characterized in that a difference between said first angle (a1) and said second angle (a2) is between 10 ° and 30 °, preferably between 14 ° and 18 °. 30 3) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 or 2, characterized in that said first and second internal rolling tracks (8, 9) are symmetrical with respect to a plane axial (S). - 13 4) pendulum damping device (12, 13, 19) according to claim 3 above, characterized in that said first and second external rolling tracks (10, 11) are symmetrical with respect to said axial plane (S). 5 5) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 to 4, characterized in that said first and second internal rolling tracks (8, 9) are circular, in particular with the same radius . îo 6) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 to 5, characterized in that said first and second external rolling tracks (10, 11) are chosen so that the pendulum body is granted to a substantially constant order of filtering of the torsional oscillations. 7) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 to 5, characterized in that said first and second external rolling tracks (10, 11) are chosen so that the pendulum body is granted to a filtering order of the oscillations of variable torsion, 20 in particular continuously increasing, in particular, increasing in stages. 8) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 to 8, characterized in that, rolling axes (C, C ') of said first and second rolling members (6 , 7) in said position of 25 rest being seen from said axis of rotation (XX ¹ ) in said radial plane (R) according to a reference angle (a), a combination C function of said second angle (a2) defined by the expression: C = (α2 / α) * 100 is between 101% and 115%. 9) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 to 8, characterized in that, rolling axes (C, C ') of said first and second rolling members (6 , 7) in said rest position being seen from said axis of rotation (XX ¹ ) in said radial plane (R) at an angle - 14from reference (a), a combination C which is a function of said second angle (a2) defined by the expression: C = (α2 / α) * 100 is between 85% and 99%. 10) pendulum damping device (12, 13, 19) according to any one of the preceding claims 1 to 10, characterized in that it comprises between three and seven pendulum bodies, preferably five pendulum bodies, distributed regularly around the axis of rotation (XX '). 11) pendulum damping device (12) according to any one of the preceding claims 1 to 10, characterized in that said pendulum body (3, 4, 6, 7) comprises: - two copies of said pendulum mass (3) arranged on either side of said Support (2); - two connecting members (4) matching said copies (3) and defining said first and second internal raceways (8, 9); and in that said support (2) comprises two parts of an edge of one or two openings (5) defining said first and second external raceways 20 (10, 11), said connecting members (4) being partially housed inside said one or more openings (5). 12) pendulum damping device (13) according to any one of the preceding claims 1 to 10, characterized in that said pendulum body (6, 25 7, 14) comprises two copies of said pendulum mass (14) arranged on either side of said support (2) and matched by connecting members (15), said first and second internal raceways (8, 9 ) being formed inside first and second housings (17, 18) in said examples (14) and said first and second external raceways (10, 11) being formed in 30 lights (5) of said support (2). 1/5