FR3047530A1 - PENDULAR DAMPING DEVICE - Google Patents

Abstract

Pendulum damping device (1), comprising: - a support (2) movable in rotation about an axis (X), - at least one pendular body (3) movable relative to the support (2), and - a junction assembly (31), adapted to connect the support (2) to a member (30) of a powertrain, the junction assembly (31) comprising: - a first component (34), capable of being connected with rigidly to the element (30) of the powertrain, and - a torque limiter (45) selectively allowing a rotational displacement of the support (2) relative to the first component (34).

Description

Pendulum damping device

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

In such an application, the pendulum damping device can be integrated with a torsion damping system of a clutch capable of selectively connecting the heat engine to the gearbox, in order to filter the vibrations due to the acyclisms of the engine. Such a torsion damping system is for example known as the double damping flywheel.

Alternatively, in such an application, the pendulum damping device may be integrated with a friction disc of the clutch, or a hydrodynamic torque converter, or a flywheel integral with the crankshaft, or a double clutch dry or wet .

Such a pendular damping device conventionally implements a support and one or more pendular bodies movable relative to this support, the displacement relative to the support of each pendulum body being guided by two rolling members cooperating on the one hand with bearing tracks secured to the support, and secondly with rolling tracks secured to the pendular bodies. Each pendulum body comprises for example two pendular masses interconnected.

When high value couples, also called "superstrain" thereafter, are transmitted in the powertrain in which the pendulum damping device is implanted, significant forces may be applied to the support of the device. last being rigidly connected to an element of this powertrain. The support or any intermediate piece allowing this rigid connection between the support and the element of the powertrain can then be weakened, or even break.

In order to protect the pendulum damping device from such high torque values, it is for example known from the application WO 2013/034125 to implant a pendular damping device on a shaft and to interpose between this shaft and the support the pendulum damping device a washer acting as a torque limiter.

There is a need to further improve the protection of pendulum damping devices against over-couples. The invention aims to meet this need and it achieves, in one of its aspects, using a pendulum damping device, comprising: - a support movable in rotation about an axis - At least one pendular body movable relative to the support, and - a junction assembly, adapted to connect the carrier to an element of a powertrain, the junction assembly comprising: - a first component, capable of being connected rigidly to the element of the powertrain, and - a torque limiter disposed between the first component and the support, this torque limiter selectively allowing a rotational displacement of the support relative to the first component.

This selective displacement occurs when an over-torque is transmitted.

Such over-couples are for example caused by acyclisms propagating in the powertrain and / or by centrifugation. These over-couples occur for example during the resonance of the double damping flywheel in case of aborted start of the engine of the vehicle or in case of abrupt release of a clutch pedal.

The device is positioned outside the path of the torque transmitted within the powertrain from the engine to the wheels of the vehicle. Thus, none of the support, of the pendular body or bodies, and of the junction assembly is positioned functionally between the heat engine and the wheels. The junction assembly may comprise a second component rigidly connected to the support, the torque limiter being disposed between the first component and the second component. The torque limiter may allow a rotational movement of the second component relative to the first component when the torque exerted on the second component reaches a predefined value.

The torque limiter thus makes it possible to protect the pendulum damping device from the over-couples, without, however, directly cooperating with the support of this pendulum damping device. The torque limiter is according to the invention positioned between two components that are not in the path of the torque transmitted within the power train of the engine to the vehicle wheels.

For the purposes of the present application: - "axially" means "parallel to the axis of rotation of the support" or "parallel to the longitudinal axis of the rolling member", as appropriate, - "radially" means "the 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", - "solid" means "rigidly coupled", and - the rest position of a pendulum is that in which the pendulum is centrifuged without being subjected to torsional oscillations from the acyclisms of the engine.

The torque limiter for example allows the rotational displacement of the second component relative to the first component when the torque on the second component is greater than 1000 Nm, in particular 2000 Nm, in particular 3000 Nm, in particular 4000 Nm, in particular 4500 Nm, in particular 5000 nm.

The second component may comprise two flanges rigidly connected to the support and moving away from each other in the direction of the axis of rotation of the support, so as to define a space in which are arranged a portion of the first component and the torque limiter.

These flanges have for example: - radially outer portions in contact with each other and both rigidly connected to the support, for example by riveting, and - radially inner portions at a distance from one another and arranging between them the aforementioned space. One of these flanges is for example flat while the other has a stepped shape, so as to create the aforementioned distance between the radially inner portions of these flanges.

The first component may be a flange. The latter is then unique. This flange has for example a radially inner portion adapted to be rigidly connected, in particular by riveting, to the element of the powertrain and a radially outer portion disposed in the space defined by the second component. The flange may have a stepped shape, its radially inner portion being axially offset relative to its radially outer portion.

Alternatively, the structure of the junction assembly can be reversed, the first component then comprising two flanges each capable of being rigidly connected to the powertrain element and defining a space in which are arranged a portion of the single flange forming the second component and the torque limiter.

The torque limiter is for example a washer, for example a Belleville washer. Alternatively, it may be a wave washer, for example Onduflex® type.

The washer is in particular arranged obliquely with respect to the axis of rotation of the support, so that a portion of this washer rubs against the first component and that another portion of this washer rubs against the second component . The radially inner portion of the washer rubs for example against the first component while the radially outer portion of the washer rubs against the second component.

In an exemplary implementation of the invention, the first and second components are made of metal. It may be the same metal, for example sheet metal.

In another embodiment of the invention, the first and second components are made of plastic.

The choice of materials used to make the first component and the second component can be made so as to choose the friction coefficients exerted on the torque limiter, and thus the effort that it must produce. It is thus determined from which over-torque value the rotation of the second component relative to the first component is possible.

The portion of the junction assembly capable of being rigidly connected to the powertrain element, in particular the radially inner portion of this junction assembly, and the portion of the junction assembly rigidly connected to the support, in particular the portion radially outer of the junction assembly, can be axially offset. In other words, the junction assembly creates an axial offset between the powertrain member and the support of the pendulum damping device.

As a variant of what has been described above, the junction assembly may be devoid of a second component, in which case the torque limiter is in direct contact with the support of the pendular damping device.

The torque limiter allows for example the rotational displacement of the support relative to the first component when the torque on the support is greater than 1000 Nm, in particular 2000 Nm, in particular 3000 Nm, in particular 4000 Nm, in particular 4500 Nm, in particular 5000 Nm.

The torque limiter is for example a washer as described above. The washer is in particular arranged obliquely with respect to the axis of rotation of the support, so that a portion of this washer rubs against the first component and that another portion of this washer rubs against the support. The radially inner portion of the washer rubs for example against the first component while the radially outer portion of the washer rubs against the support.

In all the above, the displacement relative to the support of the pendular body can be guided by at least one rolling member, the latter cooperating on the one hand with at least one first running track secured to the support, and secondly with at least one second rolling track integral with the pendulum body.

According to a preferred embodiment, the rolling member cooperates with a single first raceway and with only one second raceway, and the second raceway is defined by the connecting member of the pendular body. A portion of the contour of this connecting member defines for example the second rolling track. Alternatively, a coating may be deposited on this portion of the contour of the connecting member to form the second raceway. Such a connecting member is for example force-fitted via each of its axial ends into an opening in one of the pendular masses. Alternatively, the connecting member may be welded and / or screwed and / or riveted via its axial ends on each pendulum mass.

According to the preferred embodiment, the displacement of each pendular body relative to the support can be guided by at least two rolling members, including exactly two rolling members. Two connecting members each defining a second raceway and cooperating each with a rolling member may be provided.

According to this preferred embodiment, each pendulum body comprises for example two connecting members matching each pendulum mass of this body, each connecting member being integral with each of these pendular masses. Each rolling member can then be stressed only in compression between the first and second raceways mentioned above. These first and second raceways cooperating with the same rolling member may be at least partly radially opposite, that is to say that there are plans perpendicular to the axis of rotation in which these tracks both extend.

According to the preferred embodiment, each running member can be received in a window of the support already receiving a connecting member and receiving no other rolling member. This window is for example defined by a closed contour, a portion of which defines the first rolling track secured to the support which cooperates with this rolling member.

According to another preferred embodiment, the rolling member cooperates on the one hand with a single first raceway secured to the support, and on the other hand with two second races integral with the pendular body. Each pendulum mass then has a cavity, a portion of the contour defines one of these second raceways.

According to this other preferred embodiment, each connecting member includes for example several rivets, and this connecting member is received in a window of the support, while the rolling member is received in a cavity of the support, distinct from a receiving window. a liaison member.

According to this other preferred embodiment, two rolling members can guide the displacement of the pendular body relative to the support, and each rolling member cooperates with a first raceway dedicated to this rolling member and with two second raceways dedicated to this running gear.

According to this other preferred embodiment, each rolling member can then comprise successively axially: a portion disposed in a cavity of the first pendulum mass and cooperating with the second rolling track formed by a portion of the contour of this cavity, a portion disposed in a cavity of the support and cooperating with the first raceway formed by a portion of the contour of this cavity, and - a portion disposed in a cavity of the second pendulum mass and cooperating with the second raceway formed by a portion of the contour of this cavity.

Alternatively, the pendular damping device may comprise two integral supports and the pendular body comprises one or more pendular masses arranged axially between the two supports. The pendulum body may comprise several pendular masses, for example two or three pendular masses, which may or may not be secured to each other, and which are arranged axially between the two supports.

In all the above, each running member can cooperate with the running track (s) integral with the support and with the running track (s) integral with the pendular body only via its outer surface.

Each rolling member is for example a roll of circular section in a plane perpendicular to the axis of rotation of the support. This roll may comprise several successive cylindrical portions of different radius. The axial ends of the roll may be devoid of a thin annular flange. The roller is for example made of steel. The roll may be hollow or full.

The shape of the first and second rolling tracks may be such that each pendulum body is only displaced relative to the support in translation about a fictitious axis parallel to the axis of rotation of the support.

As a variant, the shape of the rolling tracks may be such that each pendular body is displaced with respect to the support both: in translation about a fictitious axis parallel to the axis of rotation of the support and also in rotation around the center of gravity of said pendulum body, such a movement being again called "combined movement" and disclosed for example in the application DE 10 2011 086 532.

When the device comprises several pendular bodies, all these pendular bodies may succeed each other circumferentially. The device may thus comprise a plurality of planes perpendicular to the axis of rotation in each of which all the pendular bodies are arranged.

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

In all the foregoing, the device may comprise at least one interposition piece of which at least a portion is axially disposed between the support and a pendular mass of the pendular body. The interposition piece is for example fixed on a pendular mass or the support or formed by a coating deposited on a pendular mass or on the support. Such an interposition piece can thus limit the axial displacement of the pendular body relative to the support, thus avoiding axial shocks between said parts, and thus wear and unwanted noises, especially when the support and / or the pendulum mass are made of metal. Several interposition pieces, for example in the form of pads, may be provided. The interposition pieces are in particular made of a damping material, such as plastic or rubber.

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

In all of the above, each pendular body may comprise at least one abutment damping member against the support. Each of these abutment damping members can then come into contact with the support to damp the abutment of the pendulum body against the latter, for example: - at the end of a displacement in the counterclockwise direction of this pendulum body from the rest position for filtering a torsional oscillation, and / or - following a displacement in the non-trigonometric direction of this pendulum body from the rest position to filter a torsional oscillation, and / or - in case radial drop of the pendulum body, for example when stopping the engine of the vehicle.

Where appropriate, each abutment damping member can damp the stop of the pendulum body against the support at the end of a movement in the counterclockwise direction from the rest position, after a displacement in the direction non-trigonometric since the rest position but also in case of radial fall of the pendulum body. The same abutment damping member can thus be associated with a pendulum body for damping all the abovementioned contacts between the pendulum body and the support.

Each abutment damping member may be dedicated to a connecting member of the pendular body and carried by the latter.

Each abutment damping member may have elastic properties for damping shocks related to the contact between the support and the pendulum body. This damping is then allowed by a compression of the abutment damping member. The abutment damping member is for example elastomer or rubber.

All pendular bodies can be tuned to the same order value, or to different order values, from one pendulum body to another. The invention further relates, in 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, a flywheel integral with the crankshaft, or a clutch friction disk or a double clutch dry or wet, this component comprising a pendulum damping device as defined above.

The support of the pendular damping device may then be one of: - a web of the component, - a guide washer of the component, - a phasing washer of the component, or - a separate support of said web, said washer of guide and said phasing washer.

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

The component is in particular a double damping flywheel and the latter then comprises: - a primary flywheel, adapted to be connected to a crankshaft of a vehicle engine, - a secondary flywheel, adapted to be connected to the input of a single clutch or double or to the input shaft of a robotized gearbox, - a plurality of resilient return members mounted to each other in parallel between the primary flywheel and the secondary flywheel, and - the damping device pendulum as defined above, the first component of the pendulum damping device being rigidly connected to the secondary flywheel.

The first component of the pendulum damping device is for example rigidly connected to the web of the secondary flywheel.

In such a double damping flywheel, the pendular body may be disposed radially outwardly with respect to the elastic return members. For any position of the pendular body, the latter may be radially outwardly more than the elastic return members of the double damping flywheel. Alternatively, the pendulum body may be arranged radially at the same level as the elastic return members. The invention will be better understood on reading the following description of a non-limiting example thereof and on examining the appended drawing in which: FIG. 1 is an exploded view of a device pendulum damping device according to an exemplary implementation of the invention, and - Figures 2 and 3 are different sectional views of the device of Figure 1 when the latter is assembled.

Shown schematically in FIG. 1 is a pendular damping device 1.

The damping device 1 is of the pendulum oscillator type.

The device 1 is integrated in a double damping flywheel in the example described but in variants it could be integrated with a hydrodynamic torque converter, a flywheel secured to the crankshaft, a double clutch dry or wet, or a clutch disc .

The dual damping flywheel is part of a powertrain of a motor vehicle, this group comprising a thermal engine including two, three, four, six or eight cylinders.

The double damping flywheel comprises in known manner: a primary flywheel integral with the crankshaft of the heat engine, a secondary flywheel 30 adapted to be rigidly connected to the input of a single clutch, a double clutch or a clutch. a robotized transmission input shaft, and - a plurality of springs 32 connected in parallel and interposed between the primary flywheel and the secondary flywheel 30.

In FIG. 1, the pendular damping device 1 is represented in the assembled state and at rest, that is to say that it does not filter the torsional oscillations transmitted by the powertrain because of the acyclisms of the thermal motor.

The device 1 comprises in the example under consideration: 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 described, the pendular damping device 1 comprises a single support 2 and six pendulous bodies 3, each pendulum body 3 comprising two pendular masses 5, each pendulum mass 5 extending respectively axially opposite one side 4 of the support 2. These two pendular masses 5 are secured together by several connecting members 6.

In the example, two connecting members 6, also called "spacers", are angularly offset. Each connecting member 6 is here secured to the pendulum masses 5, being force-fitted via each of its ends in an opening 17 formed in one of the pendulum masses 5. In variants, the connecting member 6 can receive screws and / or rivets and / or be welded to each pendulum 5.

The device 1 also comprises rolling members not visible in the figures, which guide the displacement of the pendular bodies 3 relative to the support 2. The rolling members are for example rollers having a plurality of different successive diameters.

The movement relative to the support 2 of each pendulum body 3 is in this example guided by two rolling members, each rolling member cooperating on the one hand with: - a first rolling track secured to the support 2, - a second track of integral bearing of the pendulum body 3.

Each rolling member cooperates here with a single first raceway and with only one second raceway, the first raceway being formed by a portion of the contour 18 of the window 19 formed in the support 2, and receiving the body rolling track, and the second raceway being defined by a portion of the radially outer edge of a connecting member 6 of the pendulum body 3.

Each window formed in the support 2 here receives a single connecting member 6 and a single rolling member, and it has a closed contour 18.

The device 1 may also comprise abutment damping members 20 which are for example visible in FIG. 3. Each abutment damping member 20 is in this example made of rubber and can dampen all or part of the shocks in producing between a pendulum body 3 and the support 2.

The device 1 for pendular damping is in the example of Figure 2 connected to the double damping flywheel so that the pendulum bodies 3 are arranged radially at the same level as the springs 32 of the latter.

The pendulum damping device 1 is rigidly connected to the web of the secondary flywheel 30 of the double damping flywheel via a junction assembly 31 which will now be described. This junction assembly 31 comprises in the example described a first component 34, in the form of a flange and rigidly connected to the web of the secondary flywheel 30. This rigid connection is made in the example considered via rivets 35 extending through an outlet hub 36 of the dual damping flywheel. A positioning washer 37 of the web 30 is still shown in FIG.

As can be seen in Figures 1 to 3, the flange 34 forming the first component here has a non-planar shape, its radially inner end, riveted with the web of the secondary flywheel 30 being axially offset relative to its radially outer end.

The junction assembly further comprises a second component 39, in the example described in the form of two flanges 40 and 4L

These two flanges 40 and 41 are rigidly connected to the support 2 of the pendular damping device 1. In the example described, this connection is made by means of rivets 43.

It can be seen in FIGS. 1 to 3 that the flanges 40 and 41 have different shapes. Thus, the flange 40, which is the furthest axially speaking from the web of the secondary flywheel 30 is plane whereas the flange 41 which is axially closest to the web of the secondary flywheel 30 has a radially inner end which is axially offset relative to at its radially outer end. More specifically, the shape of the flange 41 is such that: the two flanges 40 and 41 have their radially outer ends in contact with one another and riveted together with the support 2 of the pendular damping device 1, and two flanges 40 and 41 have their radially inner ends at a distance from each other, so as to provide a space between them. Inside this space are received: - the radially outer end of the flange 34, and - a torque limiter 45, allowing a rotational movement of the second component 39 relative to the first component 34 under predefined conditions.

The torque limiter 45 allows for example the rotational movement of the second component 39 relative to the first component 34 when the torque exerted on the second component 39 reaches 4000 Nm, in particular 4500 Nm, in particular 5000 Nm.

The torque limiter 45 is here formed by a washer Belleville type, and the latter is, as shown in the figures, mounted at an angle to the axis of rotation X of the support 2. It can thus be seen in the figures that the radially inner portion 50 of the washer 45 rubs against the flange of the first component 34 while the radially outer portion 51 of the washer 45 rubs against the flange 40 of the second component 39.

In the example described, each of the flanges 34, 40 and 41 is made of metal, for example sheet metal.

In a variant, each of the flanges 34, 40 and 41 could be made of plastic.

The operation of the pendulum damping device 1 of the example of Figures 1 to 3 will now be described.

As long as the torque exerted on the second component 39 remains below a predefined value, the torque limiter 45 immobilizes together the first component 34 and the second component 39, so that the support 2 of the pendular damping device 1 is integral with the secondary steering wheel 30.

When an over-torque propagates in the powertrain, the torque limiter 45 rotates the second component 39 which can then rotate relative to the first component 34. Thus protects the pendulum damping device 1. The invention is not limited to the example just described.

In a variant, no second component is present and the torque limiter 45 cooperates directly with the support 2.

Claims (11)

claims Pendulum damping device (1), comprising: - a support (2) movable in rotation about an axis (X), - at least one pendular body (3) movable relative to the support (2), and a junction assembly (31) capable of connecting the support (2) to an element (30) of a powertrain, the junction assembly (31) comprising: a first component (34) capable of being rigidly connected to the powertrain member (30), and - a torque limiter (45) disposed between the first component (34) and the carrier (2), said torque limiter (45) selectively displacing in rotation of the support (2) relative to the first component (34). 2. Device according to claim 1, the junction assembly (31) comprising a second component (39) rigidly connected to the support (2), the torque limiter (45) being arranged between the first component (34) and the second component (39), the torque limiter (45) allowing a rotational movement of the second component (39) relative to the first component (34) when the torque exerted on the second component (39) reaches a predefined value. 3. Device according to claim 2, the second component (39) comprising two flanges (40, 41) rigidly connected to the support (2) and moving away from each other in the direction of the axis of rotation (X) of the support (2), so as to define a space in which are arranged a portion of the first component (34) and the torque limiter (45). 4. Device according to claim 2 or 3, the first component being a flange (34). 5. Device according to any one of claims 2 to 4, the torque limiter (45) being a washer arranged at an angle to the axis of rotation (X) of the support (2), so that a portion (50) of this washer (45) rubs against the first component (34) and that another portion (51) of this washer (45) rubs against the second component (39). 6. Device according to any one of claims 2 to 5, the first component (34) and the second component (39) being made of metal. 7. Device according to any one of claims 2 to 5, the first component (34) and the second component (39) being made of plastic. 8. Device according to any one of claims 2 to 7, the portion of the junction assembly (31) adapted to be rigidly connected to the element (30) of the powertrain and the portion of the assembly of junction (31) rigidly connected to the support (2) being axially offset. 9. Device according to any one of the preceding claims, the displacement relative to the support (2) of the pendulum body (3) being guided by at least one rolling member, the latter cooperating on the one hand with at least one first track rolling bearing secured to the support, and secondly with at least one second raceway integral with the pendulum body. 10. Double damping flywheel, comprising: - a primary flywheel, adapted to be connected to a vehicle engine crankshaft, - a secondary flywheel (30), adapted to be connected to the input of a single or double clutch or to the input shaft of a robotized gearbox, - a plurality of resilient return members mounted to each other in parallel between the primary flywheel and the secondary flywheel (30), and - the damping device pendulum (1) according to any one of the preceding claims, the first component (34) of the pendular damping device (1) being rigidly connected to the secondary flywheel (30). 11. Double damping flywheel according to claim 10, the pendulum body (3) being disposed radially outwardly relative to the elastic return members (32) or radially at the same level as the elastic return members (32).