FR3059750B1 - PENDULAR DAMPING DEVICE - Google Patents

Abstract

Device (1) for pendular damping, comprising: - a support (2) able to move in rotation about an axis (X), - at least one pendular body (3) comprising: a first and a second pendulum masses (5) axially spaced relative to each other and movable relative to the support (2), the first pendulum mass (5) being disposed axially of a first side (4) of the support (2) and the second pendulum mass (5) being arranged 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) guiding the displacement of the pendulum body (3) relative to the support (2), the rolling member (11) having a portion (31) having a surface capable of rolling simultaneously on a first rolling track secured to the support (2) and on a second raceway (13) defined by the member link (6), the rolling member (11) and the connecting member (6) having facing surfaces cooperating directly so as to limit the axial displacement of the rolling member (11) relative to the connecting member (6).

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 remove vibrations due to motor acyclisms. Such a torsion damping system is for example a double damping flywheel.

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

The pendulum damping device comprises, in a known manner, pendular bodies movable with respect to a support, the movement relative to the support of a pendular body being guided by at least one rolling member such as a roller, rolling with a part on a first running track secured to the support, and secondly on a second running track secured to the pendulum body and defined by a connecting member connecting two masses of the pendulum body. Such a pendular damping device is for example disclosed by the application FR 3 010 162.

It is desirable to avoid:

the axial contacts between the rolling member and the two pendular masses of the pendular body between which it is arranged axially, and / or

the axial contacts between the support and one or other of these two pendular masses.

For this purpose, the application FR 3 010 162 proposes to use plastic pads reported, these pads being interposed between each pendulum mass and:

- the support, and / or

- the running gear.

Such pads therefore require additional parts, which is expensive, and these pads can wear.

There is a need to avoid or reduce the aforesaid axial contacts, which adversely affect the filtration performance of the acyclisms provided by the pendulum damping device, without resorting to plastic pads reported.

The purpose of the invention is to meet this need and it achieves this, according to one of its aspects, with the aid of a pendulum damping device, comprising:

a support able to move in rotation about an axis,

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

at least one rolling member guiding the displacement of the pendular body relative to the support, the rolling member having a portion having a surface capable of rolling simultaneously on a first running track secured to the support and on a second defined raceway; by the connecting member, the rolling member and the connecting member having facing surfaces cooperating directly so as to limit the axial displacement of the rolling member relative to the connecting member.

Thus, the limitation of the axial displacement of the rolling member relative to the connecting member is via the cooperation between this rolling member and this connecting member, without the need to add for example one or more skates to do this. For the purposes of the present application, facing surfaces cooperate directly when their cooperation does not involve intermediate parts.

These surfaces facing the rolling member and the connecting member may be configured to prevent axial shocks between the rolling member and each pendulum of the pendulum body. By preventing these axial shocks, it prevents axial friction between the running member and these two pendulum masses, these axial friction may impair the filter performance of the pendulum body.

If necessary, as will be seen later, the rolling member can also be maintained in axial position on the support, so that the axial shocks between the support and each pendulum mass are avoided, thereby further improving the performance of filtering of the pendulum body.

The running gear can only be stressed 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. These first and second raceways are for example completely radially opposite.

For the purposes of this application:

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

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

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

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

- "solidaire" means "rigidly coupled",

the order of excitation of a heat engine is equal to the number of explosions of this engine per revolution of crankshaft, and

- The rest position of a pendulum body is the one in which the pendulum body is centrifuged without being subjected to torsional oscillations from the acyclisms of the engine.

According to a first example of implementation of the invention, the surfaces of the connecting member and the rolling member which limit the axial displacement of the rolling member relative to the connecting member are surfaces. axially opposite.

According to this first example of implementation, the rolling member can comprise successively axially:

- a first part,

the portion having the surface capable of rolling simultaneously on the rolling tracks, and

- a second part, and the connecting member may comprise successively axially:

a first radial withdrawal facing radially of the first part of the rolling member,

the second raceway facing radially of said portion of the running gear, and

a second radial withdrawal facing radially of the second part of the rolling member.

The first and the second part of the rolling member may define radial projections on either side of the portion of the rolling member having the rolling surface simultaneously on each raceway.

According to this first example of implementation, the second raceway may have an axial dimension smaller than that of the connecting member. The axial dimension of the connecting member may then be equal to: the axial dimension of the first shrinkage, the axial dimension of the second raceway, and the axial dimension of the second shrinkage.

According to this first example of implementation, the cooperation between the first part and the second part of the rolling member with the axial surfaces of the portion of the connecting member forming the second raceway can ensure the limitation of the axial displacement of this rolling member relative to the connecting member. The first part of the rolling member has, for example, an axial flank cooperating with an axially facing flank of the portion of the connecting member forming the second rolling track while the second portion of the rolling member has a axial flank cooperating with a flank axially facing the portion of the connecting member forming the second raceway.

Each of said flanks of the first and second portions may comprise a flat surface axially facing a curved surface of said portion defining the second rolling track.

Still according to this first example of implementation, the dimension of the axial space between the first and the second pendulum mass may be greater than the axial dimension of the rolling member. The cooperation between the axially facing surfaces of the connecting member and the rolling member as well as the difference between the dimension of the axial space between the two pendular masses of the pendulum body and that of the rolling member can allow axial play to always exist between:

the rolling member and the first pendulum mass, and

- The rolling member and the second pendulum mass.

It is thus possible to guarantee the absence of friction between the rolling member and these first and second pendulum masses. A clearance of for example 0.2 mm may still exist between the rolling member and each of the pendular masses of the pendulum body

Still according to this first example of implementation of the invention, the first portion and the second portion of the rolling member may have radial ends capable of axially framing the first raceway. These radial ends can limit the axial displacement of the rolling member relative to the support. In such a case, the rolling member, whose axial displacement is limited relative to the connecting member and therefore to the pendulum body, also has a limited axial displacement relative to the support. As a result, the axial displacement of the pendular body relative to the support is limited. It is then possible to prevent shocks between the support and the pendular body via the rolling member. When the rolling member rolls on both the first raceway and the second raceway, the radially outer ends of the first and the second part of this running gear can axially frame the support, while the radially inner ends of this first portion and this second portion axially frame the second raceway, allowing these limitations of axial displacement.

According to this first example of implementation, the surface capable of rolling simultaneously on the first raceway and on the second raceway may be a cylinder. There are then section planes in which this surface corresponds to a straight line.

According to a second example of implementation of the invention, the surfaces of the rolling member and the connecting member cooperating so as to limit the axial displacement of the rolling member relative to the connecting member. are radially facing surfaces.

According to this second example, the portion of the rolling member having the surface capable of rolling simultaneously on the first raceway and on the second raceway can be convex and said raceways can define concave surfaces of complementary shape. the one that is convex.

According to a variant of this second example, the surface capable of rolling simultaneously on the first raceway and on the second raceway may be concave and said raceways may define convex surfaces of complementary shape to that which is concave.

The shape of the surfaces of the raceways and the shape of the surface of the rolling member capable of rolling simultaneously on these raceways can improve the contact pressures between the running gear and raceways.

According to this second example of implementation, the surface capable of rolling simultaneously on the first rolling track can define, in section planes, a convex broken line, respectively concave, and each running track on which this portion can roll. also a broken line which is then concave, respectively convex.

These broken lines may have only two segments, or more segments. These broken lines have for example three segments, a first segment oriented obliquely with respect to an axis parallel to the axis of rotation of the device, a second segment oriented parallel to this axis, and a third segment oriented obliquely with respect to this axis. The first segment and the third segment may have symmetrical orientations relative to a plane perpendicular to this axis.

According to the second example of implementation, axial interposition pieces, for example plastic pads, may be arranged between the rolling member and each pendular mass of the pendular body.

According to one or other of the exemplary embodiments of the invention, the surface capable of rolling simultaneously on the first raceway and on the second raceway may have a plane of symmetry perpendicular to the axis of rotation. rotation of the support.

According to the second example of implementation, the axial dimension of the surface capable of rolling simultaneously on the first raceway and on the second raceway may be equal to the axial dimension of the running gear.

In all the foregoing, the first raceway and the second raceway may have shapes allowing the displacement of the pendular body relative to the support is only a translational movement about a fictitious axis parallel to the axis of rotation of the support. In other words, no rotation of the pendular body around its center of gravity occurs then.

Alternatively, the first raceway and the second raceway may have shapes that allow the displacement of the pendulum body relative to the support combines:

a displacement in translation about a fictitious axis parallel to the axis of rotation of the support and,

- a rotation around the center of gravity of the pendulum body.

Such a movement is still called a "combined movement".

In all the above, two rolling members may be provided to guide the movement relative to the support of the pendulum body, the same portion of one of these rolling members rolling simultaneously on a first raceway defined by the support and on a second raceway defined by a connecting member of the pendulum body, and a same portion of the other of these rolling members rolling simultaneously on another first raceway defined by the support and on another second raceway defined by another connecting member of the pendulum body.

Each rolling 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.

In all the above, each running member can cooperate with the first running track secured to the support and the second running track secured to the pendulum body only via its outer surface. This outer surface has an angular sector rolling on the first raceway while another angular sector of this outer surface rolls simultaneously on the second raceway.

Each running member is for example a roll made of steel. The roll may be hollow or full.

The device comprises for example a number of pendular bodies between two and eight, including three, four, five or six pendulous bodies.

All these pendular bodies may succeed one another 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, in the pendulum damping device, all the first integral bearing tracks of the support may have exactly the same shape between them and / or all the second integral running tracks of the pendular body may have exactly the same shape. between them.

All pendular bodies can be tuned to the same order value, or to different order values, from one pendulum body to another.

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:

- Tissue a displacement in the counterclockwise direction of the pendulum body from the rest position to filter a torsional oscillation, and / or

to Tissue of a displacement in the non-trigonometric direction of this pendulum body from the rest position to filter a torsional oscillation, and / or

- In case of radial drop of the pendulum body, for example when stopping the engine of the vehicle.

The pendulum body comprises for example two abutment damping members and two connecting members, each abutment damping member being respectively associated with a connecting member. Each abutment damping member extends for example axially between the two pendular masses of the pendulum body, being fixed on these two pendular masses. Alternatively, a stop damping member is attached to the connecting member with which it is associated.

The 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.

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, a fixed flywheel of the crankshaft, a double dry or wet clutch, a simple wet clutch, a hybrid powertrain component, or a friction disc, comprising a pendulum damping device defined above.

The support of the pendular damping device can then be one of:

a veil of the component,

a guiding washer of the component,

a phasing washer of the component, or

a support separate from said web, said guide washer 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 invention will be better understood on reading the description which will follow of examples of implementation thereof and on examining the appended drawing in which:

FIG. 1 partially shows a pendular damping device to which the invention can be integrated;

FIGS. 2 to 4 partially show a pendular damping device according to a first exemplary embodiment of the invention, FIG. 2 being a sectional view along a plane of symmetry of a running member of this invention. pendulum damping device, Figure 3 showing a detail of Figure 2 and Figure 4 being a side view of what is shown in Figure 2, and

- Figures 5 and 6 show in part a pendulum damping device according to a second example of implementation of the invention, these Figures 5 and 6 being similar to Figures 2 and 4, respectively.

FIG. 1 shows an example of a pendular damping device 1.

The device 1 is particularly suitable for equipping a motor vehicle transmission system, being for example integrated with a component not shown of such a transmission system, this component being for example a double damping flywheel, a hydrodynamic torque converter, a flywheel integral with the crankshaft, a wet or dry dual clutch, a simple wet clutch, a hybrid powertrain component, or a clutch friction disc.

This component can be part of a powertrain of a motor vehicle, including a thermal engine including three or four cylinders.

In the figures, the device 1 is at rest, that is to say that it does not filter the torsional oscillations transmitted by the propulsion chain due to the acyclisms of the engine.

In known manner, such a component may comprise a torsion damper having at least one input element, at least one output element, and circumferentially acting resilient return members which are interposed between said input and output elements. . For the purposes of the present application, the terms "input" and "output" are defined with respect to the direction of torque transmission from the engine of the vehicle to the wheels of the latter.

The device 1 comprises in the example 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 of FIG. 1, six pendulous bodies 3 are provided, being distributed uniformly around the periphery of the axis X.

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

an input element of the torsion damper,

an output element or an intermediate phasing element arranged between two series of spring of the shock absorber, 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 2 may be other, such as a flange.

In the example considered, the support 2 generally has a ring shape having two opposite sides 4 which are here planar faces.

As can be guessed from FIG. 1, each pendulum body 3 comprises in the example under consideration:

two pendulum masses 5, each pendulum mass 5 extending axially facing a side 4 of the support 2, and

two connecting members 6 solidarizing the two pendulum masses 5.

The connecting members 6, also called "spacers", are in the example considered angularly offset.

In the example of the figures, each end of a connecting member 6 is force-fitted into an opening in one of the pendulum masses 5 of the pendulum body 3, so as to fasten these two pendular masses 5 to one another.

Each connecting member 6 extends partly in a window formed in the support. In the example considered, the window defines a blank space inside the support, this window being delimited by a closed contour.

The device 1 further comprises in the example considered rolling members 11, visible in Figures 2 to 6, guiding the displacement of the pendulum bodies 3 relative to the support 2. In the example described, the movement relative to the support 2 of each pendulum body 3 is guided by two rolling members 11, each of them cooperating in the example of the figures with one of the connecting members 6 of the pendulum body 3. The rolling members 11 are here rollers, as we will see later.

As can be guessed from FIG. 1, the device 1 can also comprise abutment damping members 25 able to come into simultaneous contact with a connecting member 6 and with the support 2 in certain relative positions of the support 2 and pendulum masses 3, such as the positions of abutment at the end of a movement from the rest position to filter a torsional oscillation. Each abutment damping member 25 is here integral with a pendular body 3, being mounted on each pendulum body 3 and arranged so as to be interposed radially between a connecting member 6 of this pendulum body 3 and the contour 10 of the opening 9.

In the examples considered, each rolling member 11 cooperates with a single single raceway secured to the support 2, and with a single second raceway 13 integral with the pendulum body 3 to guide the displacement of the pendulum body in translation about a dummy axis parallel to the axis of rotation X of the support 2 and, if appropriate, also in rotation around the center of gravity of said pendular body 3.

In the example considered, each second rolling track 13 is formed by a portion of the radially outer edge of a connecting member 6.

Each first rolling track is defined by a portion of the contour of a window formed in the support 2 and receiving one of the connecting members 6.

Each first raceway is thus arranged radially facing a second raceway 13, so that a same portion 31 of a running gear 11 has a rolling surface simultaneously via its outer surface on the first raceway 12 and on the second runway 13.

In the example of Figures 2 to 4, the surface of the rolling member 11 which rolls on the first raceway and on the second raceway 13 is a cylinder of constant radius.

According to the first example of implementation of the invention which will now be described, the axial displacement of each rolling member 11 is limited relative to the connecting member 6 on which this rolling member 11 rolls via axially surfaces. facing this rolling member 11 and this connecting member 6.

More specifically, it can be seen in FIGS. 2 to 4 that each rolling member 11 may, according to this first example of implementation, comprise successively axially:

- a first part 30,

the portion 31 having the rolling surface simultaneously on the first and second raceways, and

- a second part 32.

The connecting member 6 also comprises, successively axially:

a first radial withdrawal 34 facing radially of the first part 30 of the rolling member 11,

the second rolling track 13 facing radially of said portion 31 of the rolling member 11, and

a second radial withdrawal 35 radially opposite the second portion 32 of the rolling member 11.

As can be seen in Figures 2 and 3 in particular, the first portion 30 and the second portion 32 of the rolling member 11 here define radial projections on either side of the portion 31 of the rolling member. 11.

FIGS. 2 to 4 show again that the axial dimension of the connecting member 6 is here equal to the sum of: the axial dimension of the first shrinkage 34, the axial dimension of the second rolling track 13, and the dimension axial of the second withdrawal 35.

Similarly, it is still found in this example that the axial dimension of the rolling member 11 is equal to the sum of: the axial dimension of the first portion 30 of the rolling member 11, the axial dimension of the portion 31, and the axial dimension of the second portion 32 of the rolling member 11.

In the plane of Figures 2 and 3, it is also noted that each radial shrinkage 34 or 35 has a rectilinear profile. In this plane, the portion defining the second raceway 13 has two axial flanks 38 each extending radially outwardly from a radial withdrawal towards the radially outer surface of the connecting member 6 which defines the second raceway 13. The radially outer ends of these axial flanks which are adjacent to the second raceway 13 here have a curved shape.

It can be seen in the example of FIGS. 2 to 4 that the parts 30 and 32 of the rolling member 11 here define flanges. Thus, the radially inner end 40 of the first portion 30, respectively second portion 32, of the rolling member 11 comes radially below second raceway 13. Thus, these ends 40 of the parts 30 and 32 of the rolling member axially frame the projection formed by the portion of the connecting member 6 defining the second raceway 13 relative to the radial recesses 34 and 35.

Although not visible in the figures, the radially outer end 42 of the first part 30, respectively second part 32, of the rolling member 11 comes radially beyond the first running track secured to the support and defined by a edge of the window of the support 2 receiving the connecting member 6. Thus, these ends 42 of the parts 30 and 32 of the rolling member 11 axially frame the first raceway defined by the support 2.

FIG. 2 shows again that each portion 30 or 32 of the rolling member 11 comprises a surface 45 axially opposite an axial flank 38 of the portion of the connecting member 6 defining the second rolling track 13 Each of these surfaces 45 comprises in the example considered a flat surface 47.

The geometry of the parts 30, 31 and 32 of the rolling member 11 combined with that of the recesses 34 and 35 of the connecting member 6 as well as that of the portion of the connecting member 6 defining the second track rolling bearing 13 makes it possible to limit the axial displacement of the rolling member 11 with respect to the connecting member 6. In the example in question, the axial flanks 38 cooperate with the surfaces 45 to maintain in axial position the bearing 11 on the connecting member 6, and thus on the pendulum body 3. As can be seen in Figures 2 and 3, an axial play J can exist for any position of the pendulum body 3 relative to the support 2, between the rolling member 11 and each pendulum mass 5 of the pendulum body 3.

Similarly, the geometry of the parts 30, 31 and 32 combined with that of the support 2 can make it possible to limit the axial displacement of the rolling member 11 relative to the support 2. An axial retention of the rolling member 11 on the support 2 is allowed.

A second example of implementation of the invention will now be described with reference to FIGS.

According to this second example, and contrary to what has been described with reference to the first example of implementation, the surfaces of the rolling member 11 and the connecting member 6 cooperating so as to limit the axial displacement of this rolling member 11 relative to the connecting member 6 are radially facing surfaces, and no longer axially facing.

It can be seen in FIG. 5 that the second rolling track 13 has a convex shape, having in the plane of the figure a split-line profile with two segments 50 and 51. Although not shown, the first rolling track, which is defined by a portion of the edge of the window receiving the connecting member 6, also has a convex shape.

It is also seen in Figure 5 that the surface of the portion 31 which rolls simultaneously on the first raceway and second raceway 13 has a concave shape. In the plane of FIG. 5, this surface corresponds to a split-line profile with two segments 54 and 55. It can be seen that these two segments 54 and 55 are here symmetrical with respect to a plane of symmetry P of the rolling member. 11. This plane P also defines in this example a plane of symmetry for the two segments 50 and 51.

The invention is not limited to the examples which have just been described.

Claims (5)

claims Pendulum damping device (1), comprising: a support (2) able to move in rotation around an axis (X), - at least one pendulum body (3) comprising: a first and a second pendulum masses (5) axially spaced relative to each other and movable relative to the support (2), the first pendulum mass (5) being arranged axially on a first side (4) of the support (2) and the second pendulum mass (5) being arranged axially on a second side (4) of the support (2), and at least one connecting member (6) first and second pendulum masses (5) matching said masses, and at least one rolling member (11) guiding the displacement of the pendular body (3) with respect to the support (2), the rolling member (11) having a portion (31) having a surface capable of rolling simultaneously on a first rolling track secured to the support (2) and on a second raceway (13) defined by the connecting member (6), the rolling member (11) and the connecting member (6) having facing surfaces cooperating directly so as to limit the axial displacement of the rolling member (11) relative to the connecting member (6), the surfaces of the rolling member (11) and the member of connecting (6) cooperating to limit the axial displacement of the rolling member (11) relative to the connecting member (6) being radially facing surfaces. 2. Device according to claim 1, the surface capable of rolling simultaneously on the first raceway and on the second raceway being convex and said raceways defining concave surfaces of complementary shape to that of the convex surface. 3. Device according to claim 1, the surface capable of rolling simultaneously on the first raceway and on the second raceway being concave and said raceways defining convex surfaces of complementary shape to that of the concave surface. 4. Device according to any one of the preceding claims, the portion (31) of the rolling member (11) defining the surface capable of rolling simultaneously on the first raceway and on the second raceway having a plane of rotation. symmetry perpendicular to the axis of rotation of the support (2). 5. Component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter, a double clutch dry or wet, a simple wet clutch, a steering wheel adapted to be secured to a crankshaft , a hybrid powertrain component, or a friction disc, this component comprising a damping device (1) according to any one of claims 1 to 4.