FR3088397A1 - PENDULUM DAMPING DEVICE - Google Patents

Abstract

Pendulum damping device (1) comprising: - a support (2), - at least one pendulum body (3) comprising a first and a second pendulum mass (5), and at least one connecting member (6) matching said ones masses, and - at least one rolling member (11) cooperating with a first track and second rolling track (12) respectively secured to the first and second pendulum mass (5) and a third rolling track (13) secured to the support (2), said first and second rolling tracks (12) being defined by a first and second portion (44) respectively of the first and second pendular masses (5) in which the rolling member (11) has front faces ( 35), each front face (35) being axially opposite an internal wall (50) of a pendulum mass (5), in which said connecting member (6) is arranged radially at a distance from the rolling member (11) and axially between the first and second portions (44) so that the pendulum masses (5) are not in contact with each other.

Description

PENDULUM DAMPING DEVICE

Technical area

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

State of the art

A pendulum damping device is conventionally used to filter vibrations due to acyclisms in the engine of a motor vehicle. Indeed, the movements of the cylinders of an internal combustion engine generate acyclisms which vary in particular according to the number of cylinders. These acyclisms are capable of generating in turn vibrations which can pass into the gearbox and cause shock and undesirable noise pollution. It is therefore preferable to provide a vibration filtration device.

The pendulum damping device is conventionally rigidly fixed, by means of rivets, to a phasing washer of a torsion damping device, in particular to a clutch, a hydrodynamic torque converter or a double wet or dry clutch. . Such a torsional damping device is for example known as a double damping flywheel.

Conventionally, the pendulum damping device comprises an annular support intended to be driven in rotation and one or more pendular bodies movable relative to this support. The movement of each pendulum body relative to the support is generally guided by two rolling members each cooperating with on the one hand the tracks of the support, and on the other hand with the tracks of the pendulum body. Each pendulum body comprises for example two oscillating masses riveted together.

Application DE102013201539 discloses such a device. According to this device, each rolling member cooperates with a pair of opposite paths, respectively a first path carried by each of the masses and a second path formed by one of the edges of an opening that comprises the support. The production of at least one lumen to form, in each of the masses, the first raceway leads to a corresponding reduction in the total mass of each mass, and consequently, the operating efficiency of the damping system, which for a given size, has a lower total mass.

It has therefore been proposed in the prior art to produce raceways directly out of the masses by extrusion and to connect the masses together by means of stampings. A stamping problem occurs when the masses are too thick. In fact, the thicker the masses, the more difficult and expensive it is to stamp them.

Generally speaking, efforts are still being made to reduce costs and to simplify such a damping system, in particular guidance, and without, however, sacrificing the performance obtained as well as the quality of the damping system.

The aim of the present invention is therefore very particularly to propose a new design making it possible to solve the aforementioned drawbacks of such a damping system and to improve its performance, while retaining a small footprint and optimal operation.

Summary of the invention

To this end, the invention proposes a pendular damping device intended to be integrated in a transmission chain of a motor vehicle, in particular a clutch, comprising:

- a support capable of moving in rotation around an X axis,

- At least one pendulum body comprising a first and a second pendulum mass axially spaced relative to each other and movable relative to the support, the first pendulum mass being disposed axially on a first side of the support and the second mass pendulum being disposed axially on a second side of the support, and at least one connecting member of the first and of the second pendulum mass matching said masses, and

at least one rolling member cooperating with a first track and second rolling track respectively secured to the first and second pendulum mass and a third rolling track secured to the support, so as to guide the movement of the pendulum body relative to the support, said first and second rolling tracks being defined by a first and second portions respectively of the first and second pendular masses, in which the rolling member has front faces, each front face being axially opposite a face of a mass pendulum which is substantially perpendicular to the axis of rotation X, the connecting member being arranged radially away from the rolling member and axially between the first and second portions so that the pendular masses are not in contact between them.

Such a pendulum damping device has a connecting member making it possible to reduce the depth of stamping of the oscillating masses while allowing the latter to serve as rolling tracks for the rolling member.

Advantageously, the axial thickness of the rolling member is greater than that of the connecting element. Advantageously, the axial distance separating the two internal walls of the masses of a pendulum body facing the front faces of the rolling member is greater than the axial distance separating the internal walls of the first and second respective portions of the first and second pendulum masses . The first and second portions defining the first and second tracks of the rolling member are located radially below the rolling member.

There is an axial overlap between the rolling member and the respective first and second portions of the first and second pendulum masses.

Each of the oscillating masses comprises a body which extends radially and circumferentially, and is of generally arcuate shape. The oscillating masses are located on either side of a support and are axially opposite. In this case, the term internal wall is understood to mean the axial wall of each oscillating mass facing the support.

Within the meaning of the present application, a front face of the rolling member is a face which axially defines one end of the rolling member.

According to one embodiment, the first and second portions defining the first and second raceways project axially towards the support. Two rolling tracks integral with the pendulum body then exist, each of them being defined by a portion projecting axially towards the support from one of the pendulum masses of the pendulum body. In this case, there is an axial overlap between the support and each portion of the pendulum mass projecting axially towards the support.

Within the meaning of this request:

- "axially" means "parallel to the axis of rotation of the support",

- "radially" means "along an axis belonging to a plane orthogonal to the axis of rotation of the support and intersecting this axis of rotation of the support",

- "angularly" or "circumferentially" means "around the axis of rotation of the support",

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

- two pieces are said to be "rigidly attached" or "paired" when they are permanently immobilized relative to one another. This immobilization can result from a fixing of the first part on the second part directly or through one or more intermediate parts.

the rest position of the pendulum body is the position in which the pendulum body is subjected to a centrifugal force but not to acyclisms. In other words, the rest position of the device is observed when the support has no angular acceleration.

The rolling member and the connecting member are radially aligned when the device is at rest. The connecting member is for example received in a window provided in the support. This window may have a closed contour and part of this contour may define the raceway integral with the support. Advantageously, the window has a radially outer edge defining the third raceway, two lateral edges and a radially inner edge.

Whether or not they are radially aligned in the rest position, the connecting member can permanently be disposed at a distance from the axis of rotation of the support less than that at which the rolling member is arranged.

The connecting member can come into abutment against one of the lateral edges of the window after moving from the rest position of the pendulum body relative to the support. This displacement is carried out when torsional oscillations propagate in the propulsion chain of the vehicle, and this displacement of the pendulum body allows the filtration of these torsional oscillations by the device.

The connecting member can come into abutment on one of the lateral edges during a clockwise movement from the rest position of the pendulum body and on the other of the lateral edges during an anti-displacement -time from the rest position.

The connecting member can also come into abutment against the radially inner edge of the window, for example during a stopping of the vehicle engine or in the event of low speed of the latter. The radially inner edge of the window then prevents the radial fall of the pendulum body, and thus the noise and / or wear resulting therefrom.

As a variant, this function of avoiding radial fall of the pendulum body is carried out other than via an abutment of the connecting member.

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

Advantageously, the connecting member can carry a stop damping member capable of interposing between this connecting member and the edge of the window after moving from the rest position of the pendulum body relative to the support. .

This stop damping member can also be interposed between the connecting member and the radially inner edge of the window when the connecting member comes into abutment against this edge, as mentioned above.

The abutment damping member may have elastic properties allowing the absorption of shocks related to contact between the support and the pendulum body. This damping is then allowed by compression of the stop damping member.

The stop damping member is for example made of elastomer or rubber.

The damping member may be toroidal, surrounding the connecting member or only its central part, which is its part arranged in the window.

Alternatively, the abutment damping member may have another shape, for example not extending all around the connecting member.

According to another embodiment, the stop damping member has a radially external part defining a fourth raceway of the race member.

The rolling member can successively comprise axially:

- a portion cooperating with the first raceway,

a portion cooperating with the third rolling track, and

- a portion cooperating with the second raceway.

The rolling member is for example a roller of circular section in said plane orthogonal to the axis of rotation of the support. The roller is for example made of steel. The roller can be full or hollow.

As a variant, the portions cooperating with the first and second tracks can have a smaller radius than that of the portion cooperating with the third track.

Each of the first and second rolling tracks can be radially below the portion of the rolling member with which it cooperates. Conversely, the third raceway can be radially beyond the portion of the raceway with which it cooperates. The third raceway being also axially framed by the first and second raceways, when the pendular masses are subjected to a centrifugal effect due to the rotation of the support, the race member is subjected to a radially external force via the third raceway and it is subjected to radially internal stress via the first and second raceways. In other words, the rolling member is stressed in bending.

According to another embodiment, the device comprises two supports located axially between two oscillating masses of a pendulum body. In this variant, the rolling member comprises at least one projecting portion allowing axial maintenance of this rolling member.

The protruding portion of the rolling member can take the form of a collar located axially between the first and second portions of the first and second pendulum masses. The projecting portion is also disposed axially between the two supports.

In order to avoid axial shocks between the pendulum masses and the support, interposing pieces, also called "skids", can be placed between these elements.

In combination with all that has been said previously, the device can comprise a plurality of pendulum bodies which comprise two connecting members and two rolling members, each rolling member being associated with a connecting member.

The support can then include at least two windows, each window being able to receive one of the connecting members and one of the rolling members.

According to the invention, the total number of windows provided in the support of the device for damping torsional oscillations to secure the pendulum masses of the pendulum bodies to one another and to guide the movement of these pendulum bodies can thus be equal to the total number of rolling elements of the device.

The support can be formed in one piece in which at least one window is provided.

The connecting member can abut against the window to limit the movement of the pendulum body, especially in the circumferential direction. The link member then has a stop function in addition to its function of pendulum masses. The window allows the pendulum body to be guided and its movement to be stopped in the circumferential direction. Such a window makes it possible to dispense with adapting the support (with the exception of the window) for stopping the pendulum body, which simplifies its manufacture.

The device can comprise between 2 and 8 pendulum bodies, preferably 3 or 4.

Each pendulum body can comprise between 1 and 4 connecting members, preferably 2, and between 1 and 4 rolling members, preferably 2. By connecting member, is meant in the sense of the present invention a bidirectional axial stop constituted for example a spacer and two rivets or a spacer and two welding points.

The support can comprise for each pendulum body between 1 and 6 windows, preferably 2. The same window can be shared by two pendulum bodies, for example the window in which is housed the end rivet of two consecutive pendulum masses.

All these pendulum bodies can succeed one another circumferentially. The device can thus include a plurality of planes orthogonal to the axis of rotation in each of which all the pendulum bodies are arranged.

In all of the above, the device can include:

- at least a first pendulum body making it possible to filter a first order value of the torsional oscillations, and

- at least a second pendulum body making it possible to filter a second order value of the torsional oscillations, different from the first order value.

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

As a variant, the shape of the raceways can be such that the pendulum bodies are moved relative to the support at the same time:

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

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

Another subject of the invention is, according to another of its aspects, a component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter or a friction clutch disc, comprising a pendulum damping device as defined above.

The support for the device for damping torsional oscillations 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.

Brief description of the figures

Other characteristics, objects and advantages of the present invention will appear better on reading the detailed description which follows, and with regard to the appended drawings given by way of nonlimiting example and in which:

- Figure 1 schematically shows a pendulum damping device according to an exemplary implementation of the invention;

- Figure 2 is a front view of the device of Figure 1 in which the oscillating masses are shown in transparency;

FIG. 3 is a sectional view along I-I of the device of FIG. 2,

- Figures 4 to 7 are views similar to Figure 3 of four variants of the pendulum damping device of Figure 1 and 2;

In the various figures, identical references are used to designate identical or analogous members.

detailed description

There is shown in Figure 1 a pendulum damping device 1 according to an exemplary implementation of the invention. The device 1 is for example integrated into a component, not shown, of such a transmission system such as a double damping flywheel, a hydrodynamic torque converter or a friction disc.

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

This component can be part of a propulsion chain of a motor vehicle, the latter comprising a heat engine in particular with three, four or six cylinders.

Such a device is shown in Figures 1 and 2 and includes in the examples considered:

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

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

In the example considered, three pendulum bodies 3 are provided, being distributed uniformly around the periphery of the axis X.

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

- an input element of the torsion damper,

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

an element linked in rotation to one of the aforementioned elements and distinct from the latter, then being for example a support specific to the device 1.

The support 2 is in particular a guide washer or a phasing washer. The support can also be other, such as a flange.

In the example considered, the support 2 generally has the shape of a ring constituted by a cut metal sheet, generally made of steel, of a thickness typically less than 10 mm, preferably less than 9mm, preferably less than 8mm and comprises two opposite sides 4 which are here flat faces.

In particular, it can be seen in FIG. 1 and 2, each pendulum body 3 comprises:

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

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

One of the oscillating masses 5 of each pendulum body 3 is not shown in order to reveal the rolling members 11, in this case rollers and the connecting members 6. The oscillating masses 4, the connecting members 6 and the rolling members 11 are for example made of steel.

The connecting members 6, also called "spacers", are in the example considered angularly offset. Each connecting member 6 is arranged in a window 9 of the support 2. In the example of FIGS. 1 to 3, each connecting member 6 is secured to the oscillating masses 5 by means of two rivets 7. As a variant and like this is shown in Figure 4, each connecting member 6 is secured to the oscillating masses 5 via welds.

As shown in Figure 2, each window 9 defines a free space inside the support 2 and has a radially outer edge 20, of concave shape, a radially inner edge 21 straight, of substantially circumferential direction, and two lateral edges 22 and 23.

In the example considered, the movement, relative to the support 2, of each pendulum body 3 is guided by two rolling members 11. Each rolling member 11 is also arranged in one of the windows 9 so that each window 9 receives a connecting member 6 and a rolling member 11. In the following, only a rolling member 11 and a connecting member 6 will be described, the others being identical.

As shown in Figure 2, the rolling member 11 and the connecting member 6 are radially aligned when the device 1 is at rest. During any operating phase of the device 1, the connecting member 6 is permanently disposed at a distance from the axis X less than that at which the rolling member 11 is arranged. In other words, the connecting member 6 is arranged radially at a distance from the rolling member 11. The connecting member 6 thus does not, in the context of the present invention, have the rolling track function that a “rolling spacer” can have.

The connecting member 6 is arranged axially between a first and second portion 44 respectively of the first and second pendulum masses 5 so that the pendulum masses 5 are not in contact with each other. This makes it possible to reduce the depth of stamping while allowing the oscillating masses 5 to perform the running track function 12. The connecting member 6 makes it possible to maintain a minimum distance between the oscillating masses 5. In other words In other words, the connecting member 6 is not traversing with the portions 44, there is no axial overlap between the connecting member 6 and the portions 44.

In the examples considered in FIGS. 1 to 7, the rolling member 11 cooperates with a first track and second rolling track 12 respectively secured to the first and second pendular mass 5 and a third rolling track 13 secured to the support 2. A part of the radially outer edge 20 of the window 9 defines the third raceway 13 while the first and second raceways 12 are defined by a first and second portion 44 respectively of the first and second pendulum masses 5.

The rolling tracks 12 are radially below the rolling member 11 with which they cooperate. Conversely, the third rolling track 13 is radially beyond the rolling member 11 with which it cooperates. The third raceway 13 is also axially framed by the first and second raceway 12.

As can be seen in the examples in FIGS. 3 to 7, the rolling member 11 has front faces 35. The front faces 35 of each rolling member 11 are axially opposite an internal wall 50 of a pendular mass 5 which is substantially perpendicular to the axis of rotation X. Thus, in such a case, the rolling member is not through, there is no opening to be created in the masses.

In the examples considered, the axial distance dl separating the two internal walls 50 of the masses 5 of a pendular body facing the end faces 35 of the rolling member is greater than the axial distance d2 separating the internal walls of the first and second respective portions 44 of the first and second pendulum masses.

According to a first embodiment shown in FIGS. 1 to 4, 6 and 7, the first and second portions 44 defining the first and second rolling tracks 12 project axially towards the support 2. In this case, there is an axial overlap between the support 2 and the portion 44 of the pendulum mass projecting axially towards the support. In other words, the tracks 12 enter the support 2. Each portion 44 is then offset axially relative to the rest of the oscillating mass.

As a variant, as shown in FIG. 5, the first and second rolling tracks 12 can be produced not by stamping the portions 44 axially towards the support but by axial stamping away from the support, from the internal walls. 50 facing the end faces 35 of the rolling member 11. In this case, there is no longer any axial overlap between the support 2 and the portions 44.

The axial distance dl separating the two internal walls 50 of the masses 5 of a pendular body facing the end faces 35 of the rolling member can vary according to the embodiments so that a pocket and / or a space is created between the faces 35 of the rolling member and the wall 50, that is to say that with respect to the mean plane of the pendulum mass 5 there can be a hollow axially facing the roller 11 and a bump under the roller .

Obviously, all the variants not shown between the two cases presented above are possible, in particular variants in which the walls 50 and 44 project axially towards the support, that is to say in which the walls 50 and 44 are in axial overlap with the support 2.

In the examples considered in Figures 1 and 2, the device 1 comprises abutment damping members 25, in particular pads. Each connecting member 6 is for example associated with two pads 25. As a variant, and as shown in FIG. 6, these stop damping members can be in the form of a strip or a covering, in particular toroidal shape, surrounding in a plane orthogonal to the axis of rotation at least a part, preferably integrally, of the periphery of the connecting member 6. In the example of FIG. 6, the damping member stop 25 is toroidal in shape and is deposited all around the part of the connecting member 6 which is arranged in the window 9. In the example considered, the stop damping member 25 has a radially outer part defining a fourth raceway 14 of the race member 11.

These abutment damping members 25 make it possible to absorb the shocks associated with coming into abutment against the support 2 of the pendulum body 3 after displacement from the rest position, whatever the direction of this displacement . Such displacement takes place in planes orthogonal to the axis of rotation X, and not axially. In positions not shown, the damping member 25 can also come to be interposed between the connecting member 6 and the radially inner edge 22, for low speeds of rotation of the thermal engine of the vehicle, for example during starting. or from stopping the vehicle and in order to limit a radial fall of the pendulum body 3.

The device shown in part in Figure 7 differs from that which has been described with reference to Figure 4 only in that it comprises not one but two supports 2 located axially between two oscillating masses 3 of a pendulum body . In this variant, the rolling member 11 comprises at least one projecting portion 45 allowing axial maintenance of this rolling member.

The projecting portion 45 of the rolling member can take the form of a collar located axially between the first and second portions 44 of the first and second pendulum masses. The projecting portion is also arranged axially between the two supports 2.

We will now describe the operation of the device 1 during an operating phase.

The pendulum bodies 3, guided by the rolling members 11, move relative to the support 2 from their rest positions shown in Figure 1 when torsional oscillations propagate in the propulsion chain of the vehicle. These movements of the pendulum bodies 3 allow the filtration of torsional oscillations.

When the torsional oscillations exceed a certain threshold, the connecting members 6 abut against the side edges 22 of the windows 9 in which these are arranged.

Of course, the invention is not limited to the embodiments described and shown, provided for illustrative purposes only. The different embodiments could also be combined.

Claims (9)

1. Pendulum damping device (1) intended to be integrated in a transmission chain of a motor vehicle, in particular a clutch, comprising: - a support (2) able to move in rotation about an axis (X), - at least one pendulum body (3) comprising a first and a second pendulum mass (5) spaced axially from one another and movable relative to the support (2), the first pendulum mass (5) being disposed axially on a first side (4) of the support (2) and the second pendulum mass (5) being disposed axially on a second side (4) of the support (2), and at least one connecting member (6) of the first and second pendulum masses (5) matching said masses, and - At least one rolling member (11) cooperating with a first track and second rolling track (12) respectively secured to the first and second pendulum mass (5) and a third rolling track (13) secured to the support (2) , so as to guide the movement of the pendulum body (3) relative to the support (2), said first and second rolling tracks (12) being defined by a first and second portion (44) respectively of the first and second pendulum masses ( 5) in which the rolling member (11) has front faces (35), each front face (35) being axially opposite an internal wall (50) of a pendular mass (5) which is substantially perpendicular to the axis of rotation (X), characterized in that said connecting member (6) is arranged radially away from the rolling member (11) and axially between the first and second portions (44) so that the pendulum masses (5) are not in contact with each other be them. 2. Device according to claim 1, characterized in that said first and second portion (44) defining the first and second rolling tracks (12) project axially towards the support (2). 3. Device according to any one of the preceding claims, characterized in that the rolling member (11) and the connecting member (6) are radially aligned when the device (1) is at rest. 4. Device according to any one of the preceding claims, characterized in that the connecting member (6) is riveted or welded to the first and second portions (44). 5. Device according to any one of the preceding claims, characterized in that the connecting member (6) carries a stop damping member (25). 6. Device according to the preceding claim, characterized in that the stop damping member (25) has a radially outer part defining a fourth track 5 bearing (14) of the rolling member (11). 7. Device according to any one of claims 1 to 5, characterized in that the rolling member (11) comprises at least one portion (45) projecting. 8. Device according to the preceding claim, characterized in that the projecting portion (45) of the rolling member (11) is located axially between the first and second portions (44). 10 9. Device according to any one of the preceding claims, characterized in that each pendulum body (3) comprises two connecting members (6) and two rolling members (11), each rolling member (11) being associated with a connecting member (6). 10. Component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter or a friction clutch disc, comprising a pendular damping device (1) according to the any of the preceding claims.