FR3060691A1 - TORSION DAMPING DEVICE - Google Patents

Abstract

Torsion damping device, in particular intended to be integrated in a transmission chain of a motor vehicle, in particular in a clutch, the device comprising: - a support (12); a plurality of clocks arranged around an axis X of rotation of the support; a pendulum (13) comprising an oscillating weight (14) and at least one rolling member (16) interposed between said oscillating mass and the support so as to roll on bearing tracks of support and oscillating weight during the oscillation of the oscillating mass. The pendulum (13) comprises a reservoir (30) of lubricant having an opening opening into a contact zone of the rolling member with the support or the oscillating mass, so as to lubricate the rolling member.

Description

Technical area

The invention relates to a torsion damping device, in particular for a clutch of a motor vehicle.

State of the art

A torsional damping device is conventionally used to filter vibrations due to acyclic movements of the engine. It can in particular be integrated into a clutch, a hydrodynamic torque converter or a dry or wet double clutch.

Conventionally, it comprises a support, sometimes called a "phasing washer", intended to be driven in rotation, and several pendulum oscillating masses, mounted oscillating on the support around an axis parallel to the axis of rotation of the support, the displacement of an oscillating mass relative to the support being generally guided by two rolling members cooperating with a raceway of the support and a raceway of the oscillating mass.

There is a need to increase the life of such torsional damping devices.

An object of the invention is to meet this need.

Summary of the invention

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

a support ;

a plurality of pendulums arranged around an axis X of rotation of the support; each pendulum comprising an oscillating mass and at least one rolling member, interposed between said oscillating mass and the support so as to roll on support and oscillating mass rolling tracks during the oscillation of the oscillating mass.

Remarkably, in a torsion damping device according to the invention, at least one pendulum, preferably each pendulum, comprises a reservoir of lubricant comprising an opening opening, at least partially, preferably totally, into a contact zone of a rolling member of said pendulum with the support or an oscillating mass of said pendulum.

The "contact zone" of a pendulum rolling member is made up

- surfaces of the support and the oscillating mass of said pendulum capable of coming into contact with the rolling member during the oscillating movement of the oscillating mass, and

- the surface of the rolling member capable of coming into contact with the support or the oscillating mass of said pendulum during the oscillation movement of the oscillating mass.

The inventors have discovered that the presence of such a lubricant reservoir opening onto the contact zone considerably increases the life of the torsion damping device. Without being limited by this theory, the inventors explain these results by the increase in the lubrication time made possible by the lubricant reservoir.

The rolling element whose contact area is lubricated is called a "lubricated rolling element".

A device according to the invention can also include one or more of the following optional characteristics:

- Said pendulum, preferably each pendulum of the device, comprises several said tanks;

each rolling member of said pendulum, preferably of each pendulum, is lubricated;

- The lubricant is chosen from an oil, a grease, and a graphite or polytetrafluoroethylene powder;

- the lubricant fills the interior volume of the reservoir to more than 80%;

- The reservoir has a shape chosen from a concave cavity having a greater depth than the equivalent diameter of the opening of said reservoir, a groove, preferably extending in a plane perpendicular to Tax X, formed on the rolling track of support with which the tread of the lubricated tread member is in contact, a groove, preferably extending in a plane perpendicular to Tax X, formed on the track of the oscillating mass with which the tread of the lubricated rolling element is in contact, a groove, preferably extending in a plane perpendicular to Tax X, formed on the tread of the lubricated rolling element, a star shape formed in the bearing lubricated and comprising a central core and several substantially radial conduits, with respect to the tax Y of the lubricated bearing member;

- the tank leads to:

the tread and / or on one / or both lateral face (s) of the rolling member;

a surface of a spacer of the oscillating mass, and / or one of the large faces of the oscillating mass, in particular a large face of a counterweight, and / or a surface of a friction pad of the oscillating mass; or the edge of a rolling window of the support and / or one of the large faces of the support;

- the tank has a depth greater than 0.1 mm;

- the tank is through.

The torsion damping device according to the invention is preferably chosen from a double damping flywheel, a hydrodynamic torque converter and a friction disc.

The invention also relates to a motor vehicle equipped with a torsion damping device according to the invention.

Brief description of the figures

Other characteristics and advantages of the invention will become apparent on reading the detailed description and on examining the appended drawing in which

- Figure 1 shows, from the front, a torsion damping device according to the invention;

- Figure 2 (2a to 2c) shows details of different embodiments in which the tank has the shape of a groove;

- Figures 3 and 4 show rolling elements comprising several tanks;

- Figure 5 (5a and 5b) shows an embodiment in which the tank is formed on a large face of a counterweight;

- Figure 6 (6a-6e) shows sections, along the plane A shown in Figure 1, of different embodiments of the invention.

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

Definitions

Unless otherwise stated,

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

- radially means along a transverse axis intersecting the axis of rotation of the support;

- transverse means in a plane perpendicular to the axis of rotation of the support,

- angularly or circumferentially mean around the axis of rotation of the support,

- orthoradialement means perpendicular to a radial direction and in a transverse plane.

By transverse plane is meant a plane perpendicular to the axis of rotation of the support.

By radial plane is meant a plane containing a radial axis and the X axis.

By axial plane is meant a plane containing the axis X.

By radial offset, reference is made to the positions of two members which are not at the same distance from the X axis.

The diameter of a section or opening is called the equivalent diameter of a disc having the same surface as said section or opening. When the section or opening is discoidal, the equivalent diameter is therefore equal to the diameter of the section or opening.

The thickness of a part refers to a dimension measured along the X axis.

By motor vehicle is meant not only passenger vehicles, but also industrial vehicles, which notably includes heavy goods vehicles, public transport vehicles or agricultural vehicles.

By "oscillating mass" is meant a mass which is mounted so as to oscillate on the support in response to acyclisms of the vehicle engine. An oscillating mass is conventionally constituted by a pair of weights, extending so as to sandwich the support and rigidly joined together. An oscillating mass can also be constituted by a single counterweight.

Two pieces are said to be "rigidly secured" when they are permanently immobilized Tune relative to the other. This immobilization can result from a fixing of the first part on the second part directly or through one or more intermediate parts.

Unless otherwise indicated, the verbs to include, present or understand must be interpreted broadly, that is to say without limitation.

detailed description

As shown in FIG. 1, a torsion damping device 10 according to the invention comprises a support 12 able to move in rotation around an axis X and a plurality of pendulums 13 movable relative to the support 12 (only one of the four pendulums has been shown).

The support 12 has a generally planar shape, generally annular. The support conventionally comprises a sheet of generally annular shape. Additional elements, such as damping buffers and / or stops and / or guides for damping and / or limiting and / or guiding the oscillation movement of the rolling members, respectively, for example made of polymer, can be fixed to this sheet. They are considered as part of the support.

Each pendulum 13 comprises an oscillating mass 14 and one or more, for example two rolling members 16 (see FIG. 2).

The oscillating masses are preferably distributed equiangularly around the axis X. Preferably, their number is greater than or equal to 2 and / or less than or equal to 8. The device can in particular comprise three, five or seven oscillating masses . In the example shown in FIG. 1, the device comprises four oscillating masses uniformly distributed around the X axis, only one oscillating mass being represented.

Each oscillating mass 14 conventionally comprises first and second weights 14i and 14 ₂ , of generally planar shape, extending respectively opposite the first and second large faces of the support 12.

In the embodiment shown, each oscillating mass is mounted oscillating on the support by means of two rolling members 16, preferably rollers, which pass through a rolling window 18 (artificially visible in FIG. 2 by not representing the flyweights of the oscillating mass) formed in the thickness of the support.

Each rolling member 16 is supported on the one hand on a support rolling track 20, preferably defined by the internal contour of the rolling window 18 of the support that the rolling member passes through and, on the other hand, on an oscillating mass rolling track 22 defined by the oscillating mass.

The rolling members 16 are identical and interact in a similar manner with the support and the oscillating mass. In the following description, only one of the rolling members is therefore considered.

The first and second weights 14i and 14 ₂ are rigidly fixed to each other, preferably by means of rivets, preferably by means of a spacer 24 (which belongs to the oscillating mass), which defines the rolling track of oscillating mass 22 and which passes through the rolling window 18 of the support.

Annexes, such as friction pads 26 (FIGS. 6b to 6e) to attenuate the contact noises between the rolling members and the support or between the weights and the support. These additional members, for example made of polymer, can be attached to the counterweights or to the rivets securing the counterweights or to the spacer. They are considered to be part of the oscillating mass.

According to the invention, the device comprises a reservoir 30 of lubricant, at least one opening 34 of which opens, at least partially, preferably completely, onto the contact area of the rolling member. Advantageously, during an oscillation movement, the opening 34 of the reservoir 30 is thus at least partially closed by another part of the device. This obturation, generally temporary, is accompanied by an action on the lubricant, tending to cause at least a portion of said lubricant to leave the reservoir. The oscillating movements thus maintain the regular ejection of lubricant from the reservoir.

The lubricant is therefore gradually diffused with the oscillating movements of the oscillating mass.

The lubricant can in particular be chosen from an oil, a grease, for example Molybdenum, Lithium, Silicone, Glycol, Soap or hydrocarbons, graphite or polytetrafluoroethylene (PTFE) powder.

Preferably, the lubricant fills the interior volume of the reservoir 30 to more than 50%, more than 70%, more than 80%, more than 90%, preferably to 100%.

There is no limit to the number of tanks. It may in particular be greater than one, greater than two, greater than five, or even greater than ten or greater than twenty (FIG. 3), for each rolling body considered. Preferably, all the pendulums are provided with the same number of tanks, preferably arranged in a similar manner. Only one tank is described below, but all of its characteristics are applicable to other tanks.

The shape of the tank is not limiting.

In particular, the reservoir may have the shape of a cavity, preferably completely concave, that is to say without an undercut region, as shown in FIG. 3.

The cavity may have a depth less than its length and / or its width, as shown in FIG. 3. On the contrary, the depth of the reservoir 30 can constitute its greatest dimension, as in the embodiment shown in FIG. 4 The reservoir 30 may be cylindrical, preferably of circular base.

The reservoir 30 may also have the shape of a groove, preferably the shape of a groove extending in a transverse plane (Figure 2).

In particular, the reservoir 30 can be arranged on the support raceway (FIG.

2a), on the track of oscillating mass (Figure 2b) or on the peripheral surface, preferably cylindrical, of the rolling member 16 capable of coming into contact with the support or the oscillating mass during oscillation , or tread 32 (Figures 2c, 3 and 4). In one embodiment, the reservoir 30 has the shape of a groove formed on the tread 32 and encircling the rolling member (FIG. 2c).

Preferably, the depth of the reservoir is greater than 0.1 mm and / or less than one third of the radius of the rolling member.

In one embodiment, the reservoir 30 extends substantially radially relative to the axis Y of the rolling member.

In one embodiment, all the tanks of a rolling member are radial, and preferably distributed equiangularly around the axis Y of the rolling member. As shown in FIG. 4, the reservoir can have several openings 34. It can in particular be formed in the rolling member and have a star shape comprising a central core 33 and several substantially radial conduits 35, with respect to the axis Y.

In one embodiment, the central core 33 opens onto one, preferably the two lateral faces of the rolling member, preferably along the Y axis (FIG. 4).

The opening 34, preferably circular, preferably has an equivalent diameter less than a third of the thickness of the rolling member.

The reservoir 30 can open onto a surface of the rolling member 16, in particular open onto the tread 32 (FIGS. 2c, 3, 4), but also onto one of the lateral faces (FIG. 4), preferably flat, 36i and 36 ₂ of the rolling member.

The reservoir 30 can also open onto a surface defined by the oscillating mass, and in particular onto a surface of the spacer 24, in particular on the oscillating mass rolling track 22 (FIG. 2b). It can also lead to a large internal face 38 of one of the weights (FIGS. 5, 6a), and, in general, to one face of the oscillating mass facing the support 12. It can also be provided in a buffer of friction 26 improving the contact of the oscillating mass with the support and / or a rolling member (FIGS. 6b to 6e).

The reservoir 30 can also open onto a surface of the support, and in particular onto the edge of a rolling window of the support (FIG. 2a) or onto one of the large faces 12i and 12 ₂ of the support (FIG. 5).

The reservoir 30 can be formed by any means, for example by punching (FIG. 5 for example).

As is now clearly apparent, the invention provides a solution for limiting the wear of the surfaces defining the contact area.

The service life of the torsion damping device is increased.

Of course, the invention is not limited to the particular embodiments described above. In particular, the combinations of the various embodiments described above are possible. For example, the embodiment of FIG. 6d comprises two reservoirs 30i and 30 ₂ formed on the friction pad 26 and on the spacer 24 of the oscillating mass, respectively. The embodiment of FIG. 6c comprises two reservoirs 30i and 30 ₂ formed on the friction pad 26 of the oscillating mass, and on the support raceway 20, respectively. Finally, the embodiment of FIG. 6e comprises two reservoirs 30i and 30 ₂ formed on the friction pad 26 of the oscillating mass, and on the tread 32 of the rolling member, respectively.

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Claims (10)

1. A torsion damping device, in particular intended to be integrated in a transmission chain of a motor vehicle, in particular in a clutch, the device comprising: a support (12); a plurality of pendulums arranged around an axis X of rotation of the support; each pendulum (13) comprising an oscillating mass (14) and at least one rolling member (16), interposed between said oscillating mass and the support so as to roll on tracks for supporting (20) and oscillating mass ( 22) during the oscillation of the oscillating mass, the device being characterized in that at least one pendulum (13) comprises a reservoir (30) of lubricant comprising an opening (34) opening, at least partially, into an area of contact of a rolling member of said pendulum with the support or of an oscillating mass of said pendulum, the contact area of a rolling member of a pendulum being constituted - the surfaces of the support and of the oscillating mass of said pendulum capable of coming into contact with said rolling member during the oscillation movement of said oscillating mass, and - of the surface of said rolling member capable of coming into contact with the support or said oscillating mass of said pendulum during the oscillation movement of said oscillating mass. 2. Device according to the preceding claim, wherein said pendulum comprising a reservoir, preferably each pendulum of the device comprising a reservoir, comprises several said tanks. 3. Device according to any one of the preceding claims, in which each rolling member of said pendulum comprising a reservoir, preferably each rolling member of each pendulum comprising a reservoir, is lubricated. 4. Device according to any one of the preceding claims, in which the lubricant is chosen from an oil, a grease, and a graphite or polytetrafluoroethylene powder. 5. Device according to any one of the preceding claims, in which the lubricant fills the interior volume of the reservoir (30) to more than 80%. 6. Device according to any one of the preceding claims, in which the reservoir has a shape chosen from a concave cavity having a greater depth than the equivalent diameter of the opening of said reservoir, a groove, preferably extending in a plane perpendicular to the X axis, formed on the support raceway with which the tread (32) of the lubricated rolling member is in contact, a groove, preferably extending in a plane perpendicular to the axis X, formed on the rolling track of the oscillating mass with which the tread (32) of the lubricated rolling member is in contact, a groove, preferably extending in a plane perpendicular to the axis X, formed on the tread (32) of the lubricated rolling member, a star shape formed in the lubricated rolling member and comprising a central core (33) and more rs substantially radial conduits (35), relative to the axis Y of the lubricated rolling member. 7. Device according to any one of the preceding claims, in which the reservoir leads to: the tread (32) and / or on one of the lateral faces (36i and 36 ₂ ) of the rolling member; a surface of a spacer (24) of the oscillating mass and / or one of the large faces (38) of the oscillating mass, and / or a surface of a friction pad of the oscillating mass; or the edge of a rolling window of the support and / or one of the large faces (12i; 12 ₂ ) of the support. 8. Device according to any one of the preceding claims, in which the reservoir has a depth greater than 0.1 mm and / or less than one third of the radius of the rolling member (16). 9. A torsion damping device according to any one of the preceding claims, chosen from a double damping flywheel, a hydrodynamic torque converter and a friction disc. 10. Motor vehicle equipped with a torsional damping device according to one 5 any of the preceding claims. 1/5